/* * SSLv3/TLSv1 shared functions * * Copyright The Mbed TLS Contributors * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* * The SSL 3.0 specification was drafted by Netscape in 1996, * and became an IETF standard in 1999. * * http://wp.netscape.com/eng/ssl3/ * http://www.ietf.org/rfc/rfc2246.txt * http://www.ietf.org/rfc/rfc4346.txt */ #include "common.h" #if defined(MBEDTLS_SSL_TLS_C) #include "mbedtls/platform.h" #include "mbedtls/ssl.h" #include "mbedtls/ssl_internal.h" #include "mbedtls/debug.h" #include "mbedtls/error.h" #include "mbedtls/platform_util.h" #include "mbedtls/version.h" #include "mbedtls/constant_time.h" #include #if defined(MBEDTLS_USE_PSA_CRYPTO) #include "mbedtls/psa_util.h" #include "psa/crypto.h" #endif #if defined(MBEDTLS_X509_CRT_PARSE_C) #include "mbedtls/oid.h" #endif #if defined(MBEDTLS_SSL_PROTO_DTLS) #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) /* Top-level Connection ID API */ int mbedtls_ssl_conf_cid(mbedtls_ssl_config *conf, size_t len, int ignore_other_cid) { if (len > MBEDTLS_SSL_CID_IN_LEN_MAX) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (ignore_other_cid != MBEDTLS_SSL_UNEXPECTED_CID_FAIL && ignore_other_cid != MBEDTLS_SSL_UNEXPECTED_CID_IGNORE) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } conf->ignore_unexpected_cid = ignore_other_cid; conf->cid_len = len; return 0; } int mbedtls_ssl_set_cid(mbedtls_ssl_context *ssl, int enable, unsigned char const *own_cid, size_t own_cid_len) { if (ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ssl->negotiate_cid = enable; if (enable == MBEDTLS_SSL_CID_DISABLED) { MBEDTLS_SSL_DEBUG_MSG(3, ("Disable use of CID extension.")); return 0; } MBEDTLS_SSL_DEBUG_MSG(3, ("Enable use of CID extension.")); MBEDTLS_SSL_DEBUG_BUF(3, "Own CID", own_cid, own_cid_len); if (own_cid_len != ssl->conf->cid_len) { MBEDTLS_SSL_DEBUG_MSG(3, ("CID length %u does not match CID length %u in config", (unsigned) own_cid_len, (unsigned) ssl->conf->cid_len)); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } memcpy(ssl->own_cid, own_cid, own_cid_len); /* Truncation is not an issue here because * MBEDTLS_SSL_CID_IN_LEN_MAX at most 255. */ ssl->own_cid_len = (uint8_t) own_cid_len; return 0; } int mbedtls_ssl_get_peer_cid(mbedtls_ssl_context *ssl, int *enabled, unsigned char peer_cid[MBEDTLS_SSL_CID_OUT_LEN_MAX], size_t *peer_cid_len) { *enabled = MBEDTLS_SSL_CID_DISABLED; if (ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM || ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* We report MBEDTLS_SSL_CID_DISABLED in case the CID extensions * were used, but client and server requested the empty CID. * This is indistinguishable from not using the CID extension * in the first place. */ if (ssl->transform_in->in_cid_len == 0 && ssl->transform_in->out_cid_len == 0) { return 0; } if (peer_cid_len != NULL) { *peer_cid_len = ssl->transform_in->out_cid_len; if (peer_cid != NULL) { memcpy(peer_cid, ssl->transform_in->out_cid, ssl->transform_in->out_cid_len); } } *enabled = MBEDTLS_SSL_CID_ENABLED; return 0; } #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ #endif /* MBEDTLS_SSL_PROTO_DTLS */ #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) /* * Convert max_fragment_length codes to length. * RFC 6066 says: * enum{ * 2^9(1), 2^10(2), 2^11(3), 2^12(4), (255) * } MaxFragmentLength; * and we add 0 -> extension unused */ static unsigned int ssl_mfl_code_to_length(int mfl) { switch (mfl) { case MBEDTLS_SSL_MAX_FRAG_LEN_NONE: return MBEDTLS_TLS_EXT_ADV_CONTENT_LEN; case MBEDTLS_SSL_MAX_FRAG_LEN_512: return 512; case MBEDTLS_SSL_MAX_FRAG_LEN_1024: return 1024; case MBEDTLS_SSL_MAX_FRAG_LEN_2048: return 2048; case MBEDTLS_SSL_MAX_FRAG_LEN_4096: return 4096; default: return MBEDTLS_TLS_EXT_ADV_CONTENT_LEN; } } #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ int mbedtls_ssl_session_copy(mbedtls_ssl_session *dst, const mbedtls_ssl_session *src) { mbedtls_ssl_session_free(dst); memcpy(dst, src, sizeof(mbedtls_ssl_session)); #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) dst->ticket = NULL; #endif #if defined(MBEDTLS_X509_CRT_PARSE_C) #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) if (src->peer_cert != NULL) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; dst->peer_cert = mbedtls_calloc(1, sizeof(mbedtls_x509_crt)); if (dst->peer_cert == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } mbedtls_x509_crt_init(dst->peer_cert); if ((ret = mbedtls_x509_crt_parse_der(dst->peer_cert, src->peer_cert->raw.p, src->peer_cert->raw.len)) != 0) { mbedtls_free(dst->peer_cert); dst->peer_cert = NULL; return ret; } } #else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ if (src->peer_cert_digest != NULL) { dst->peer_cert_digest = mbedtls_calloc(1, src->peer_cert_digest_len); if (dst->peer_cert_digest == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } memcpy(dst->peer_cert_digest, src->peer_cert_digest, src->peer_cert_digest_len); dst->peer_cert_digest_type = src->peer_cert_digest_type; dst->peer_cert_digest_len = src->peer_cert_digest_len; } #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ #endif /* MBEDTLS_X509_CRT_PARSE_C */ #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) if (src->ticket != NULL) { dst->ticket = mbedtls_calloc(1, src->ticket_len); if (dst->ticket == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } memcpy(dst->ticket, src->ticket, src->ticket_len); } #endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ return 0; } #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) MBEDTLS_CHECK_RETURN_CRITICAL static int resize_buffer(unsigned char **buffer, size_t len_new, size_t *len_old) { unsigned char *resized_buffer = mbedtls_calloc(1, len_new); if (resized_buffer == NULL) { return -1; } /* We want to copy len_new bytes when downsizing the buffer, and * len_old bytes when upsizing, so we choose the smaller of two sizes, * to fit one buffer into another. Size checks, ensuring that no data is * lost, are done outside of this function. */ memcpy(resized_buffer, *buffer, (len_new < *len_old) ? len_new : *len_old); mbedtls_platform_zeroize(*buffer, *len_old); mbedtls_free(*buffer); *buffer = resized_buffer; *len_old = len_new; return 0; } static void handle_buffer_resizing(mbedtls_ssl_context *ssl, int downsizing, size_t in_buf_new_len, size_t out_buf_new_len) { int modified = 0; size_t written_in = 0, iv_offset_in = 0, len_offset_in = 0; size_t written_out = 0, iv_offset_out = 0, len_offset_out = 0; if (ssl->in_buf != NULL) { written_in = ssl->in_msg - ssl->in_buf; iv_offset_in = ssl->in_iv - ssl->in_buf; len_offset_in = ssl->in_len - ssl->in_buf; if (downsizing ? ssl->in_buf_len > in_buf_new_len && ssl->in_left < in_buf_new_len : ssl->in_buf_len < in_buf_new_len) { if (resize_buffer(&ssl->in_buf, in_buf_new_len, &ssl->in_buf_len) != 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("input buffer resizing failed - out of memory")); } else { MBEDTLS_SSL_DEBUG_MSG(2, ("Reallocating in_buf to %" MBEDTLS_PRINTF_SIZET, in_buf_new_len)); modified = 1; } } } if (ssl->out_buf != NULL) { written_out = ssl->out_msg - ssl->out_buf; iv_offset_out = ssl->out_iv - ssl->out_buf; len_offset_out = ssl->out_len - ssl->out_buf; if (downsizing ? ssl->out_buf_len > out_buf_new_len && ssl->out_left < out_buf_new_len : ssl->out_buf_len < out_buf_new_len) { if (resize_buffer(&ssl->out_buf, out_buf_new_len, &ssl->out_buf_len) != 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("output buffer resizing failed - out of memory")); } else { MBEDTLS_SSL_DEBUG_MSG(2, ("Reallocating out_buf to %" MBEDTLS_PRINTF_SIZET, out_buf_new_len)); modified = 1; } } } if (modified) { /* Update pointers here to avoid doing it twice. */ mbedtls_ssl_reset_in_out_pointers(ssl); /* Fields below might not be properly updated with record * splitting or with CID, so they are manually updated here. */ ssl->out_msg = ssl->out_buf + written_out; ssl->out_len = ssl->out_buf + len_offset_out; ssl->out_iv = ssl->out_buf + iv_offset_out; ssl->in_msg = ssl->in_buf + written_in; ssl->in_len = ssl->in_buf + len_offset_in; ssl->in_iv = ssl->in_buf + iv_offset_in; } } #endif /* MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH */ /* * Key material generation */ #if defined(MBEDTLS_SSL_PROTO_SSL3) MBEDTLS_CHECK_RETURN_CRITICAL static int ssl3_prf(const unsigned char *secret, size_t slen, const char *label, const unsigned char *random, size_t rlen, unsigned char *dstbuf, size_t dlen) { int ret = 0; size_t i; mbedtls_md5_context md5; mbedtls_sha1_context sha1; unsigned char padding[16]; unsigned char sha1sum[20]; ((void) label); mbedtls_md5_init(&md5); mbedtls_sha1_init(&sha1); /* * SSLv3: * block = * MD5( secret + SHA1( 'A' + secret + random ) ) + * MD5( secret + SHA1( 'BB' + secret + random ) ) + * MD5( secret + SHA1( 'CCC' + secret + random ) ) + * ... */ for (i = 0; i < dlen / 16; i++) { memset(padding, (unsigned char) ('A' + i), 1 + i); if ((ret = mbedtls_sha1_starts_ret(&sha1)) != 0) { goto exit; } if ((ret = mbedtls_sha1_update_ret(&sha1, padding, 1 + i)) != 0) { goto exit; } if ((ret = mbedtls_sha1_update_ret(&sha1, secret, slen)) != 0) { goto exit; } if ((ret = mbedtls_sha1_update_ret(&sha1, random, rlen)) != 0) { goto exit; } if ((ret = mbedtls_sha1_finish_ret(&sha1, sha1sum)) != 0) { goto exit; } if ((ret = mbedtls_md5_starts_ret(&md5)) != 0) { goto exit; } if ((ret = mbedtls_md5_update_ret(&md5, secret, slen)) != 0) { goto exit; } if ((ret = mbedtls_md5_update_ret(&md5, sha1sum, 20)) != 0) { goto exit; } if ((ret = mbedtls_md5_finish_ret(&md5, dstbuf + i * 16)) != 0) { goto exit; } } exit: mbedtls_md5_free(&md5); mbedtls_sha1_free(&sha1); mbedtls_platform_zeroize(padding, sizeof(padding)); mbedtls_platform_zeroize(sha1sum, sizeof(sha1sum)); return ret; } #endif /* MBEDTLS_SSL_PROTO_SSL3 */ #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) MBEDTLS_CHECK_RETURN_CRITICAL static int tls1_prf(const unsigned char *secret, size_t slen, const char *label, const unsigned char *random, size_t rlen, unsigned char *dstbuf, size_t dlen) { size_t nb, hs; size_t i, j, k; const unsigned char *S1, *S2; unsigned char *tmp; size_t tmp_len = 0; unsigned char h_i[20]; const mbedtls_md_info_t *md_info; mbedtls_md_context_t md_ctx; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; mbedtls_md_init(&md_ctx); tmp_len = 20 + strlen(label) + rlen; tmp = mbedtls_calloc(1, tmp_len); if (tmp == NULL) { ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; goto exit; } hs = (slen + 1) / 2; S1 = secret; S2 = secret + slen - hs; nb = strlen(label); memcpy(tmp + 20, label, nb); memcpy(tmp + 20 + nb, random, rlen); nb += rlen; /* * First compute P_md5(secret,label+random)[0..dlen] */ if ((md_info = mbedtls_md_info_from_type(MBEDTLS_MD_MD5)) == NULL) { ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; goto exit; } if ((ret = mbedtls_md_setup(&md_ctx, md_info, 1)) != 0) { goto exit; } ret = mbedtls_md_hmac_starts(&md_ctx, S1, hs); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_update(&md_ctx, tmp + 20, nb); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_finish(&md_ctx, 4 + tmp); if (ret != 0) { goto exit; } for (i = 0; i < dlen; i += 16) { ret = mbedtls_md_hmac_reset(&md_ctx); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_update(&md_ctx, 4 + tmp, 16 + nb); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_finish(&md_ctx, h_i); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_reset(&md_ctx); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_update(&md_ctx, 4 + tmp, 16); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_finish(&md_ctx, 4 + tmp); if (ret != 0) { goto exit; } k = (i + 16 > dlen) ? dlen % 16 : 16; for (j = 0; j < k; j++) { dstbuf[i + j] = h_i[j]; } } mbedtls_md_free(&md_ctx); /* * XOR out with P_sha1(secret,label+random)[0..dlen] */ if ((md_info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA1)) == NULL) { ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; goto exit; } if ((ret = mbedtls_md_setup(&md_ctx, md_info, 1)) != 0) { goto exit; } ret = mbedtls_md_hmac_starts(&md_ctx, S2, hs); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_update(&md_ctx, tmp + 20, nb); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_finish(&md_ctx, tmp); if (ret != 0) { goto exit; } for (i = 0; i < dlen; i += 20) { ret = mbedtls_md_hmac_reset(&md_ctx); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_update(&md_ctx, tmp, 20 + nb); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_finish(&md_ctx, h_i); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_reset(&md_ctx); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_update(&md_ctx, tmp, 20); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_finish(&md_ctx, tmp); if (ret != 0) { goto exit; } k = (i + 20 > dlen) ? dlen % 20 : 20; for (j = 0; j < k; j++) { dstbuf[i + j] = (unsigned char) (dstbuf[i + j] ^ h_i[j]); } } exit: mbedtls_md_free(&md_ctx); mbedtls_platform_zeroize(tmp, tmp_len); mbedtls_platform_zeroize(h_i, sizeof(h_i)); mbedtls_free(tmp); return ret; } #endif /* MBEDTLS_SSL_PROTO_TLS1) || MBEDTLS_SSL_PROTO_TLS1_1 */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_USE_PSA_CRYPTO) static psa_status_t setup_psa_key_derivation(psa_key_derivation_operation_t *derivation, psa_key_id_t key, psa_algorithm_t alg, const unsigned char *seed, size_t seed_length, const unsigned char *label, size_t label_length, size_t capacity) { psa_status_t status; status = psa_key_derivation_setup(derivation, alg); if (status != PSA_SUCCESS) { return status; } if (PSA_ALG_IS_TLS12_PRF(alg) || PSA_ALG_IS_TLS12_PSK_TO_MS(alg)) { status = psa_key_derivation_input_bytes(derivation, PSA_KEY_DERIVATION_INPUT_SEED, seed, seed_length); if (status != PSA_SUCCESS) { return status; } if (mbedtls_svc_key_id_is_null(key)) { status = psa_key_derivation_input_bytes( derivation, PSA_KEY_DERIVATION_INPUT_SECRET, NULL, 0); } else { status = psa_key_derivation_input_key( derivation, PSA_KEY_DERIVATION_INPUT_SECRET, key); } if (status != PSA_SUCCESS) { return status; } status = psa_key_derivation_input_bytes(derivation, PSA_KEY_DERIVATION_INPUT_LABEL, label, label_length); if (status != PSA_SUCCESS) { return status; } } else { return PSA_ERROR_NOT_SUPPORTED; } status = psa_key_derivation_set_capacity(derivation, capacity); if (status != PSA_SUCCESS) { return status; } return PSA_SUCCESS; } MBEDTLS_CHECK_RETURN_CRITICAL static int tls_prf_generic(mbedtls_md_type_t md_type, const unsigned char *secret, size_t slen, const char *label, const unsigned char *random, size_t rlen, unsigned char *dstbuf, size_t dlen) { psa_status_t status; psa_algorithm_t alg; psa_key_id_t master_key = MBEDTLS_SVC_KEY_ID_INIT; psa_key_derivation_operation_t derivation = PSA_KEY_DERIVATION_OPERATION_INIT; if (md_type == MBEDTLS_MD_SHA384) { alg = PSA_ALG_TLS12_PRF(PSA_ALG_SHA_384); } else { alg = PSA_ALG_TLS12_PRF(PSA_ALG_SHA_256); } /* Normally a "secret" should be long enough to be impossible to * find by brute force, and in particular should not be empty. But * this PRF is also used to derive an IV, in particular in EAP-TLS, * and for this use case it makes sense to have a 0-length "secret". * Since the key API doesn't allow importing a key of length 0, * keep master_key=0, which setup_psa_key_derivation() understands * to mean a 0-length "secret" input. */ if (slen != 0) { psa_key_attributes_t key_attributes = psa_key_attributes_init(); psa_set_key_usage_flags(&key_attributes, PSA_KEY_USAGE_DERIVE); psa_set_key_algorithm(&key_attributes, alg); psa_set_key_type(&key_attributes, PSA_KEY_TYPE_DERIVE); status = psa_import_key(&key_attributes, secret, slen, &master_key); if (status != PSA_SUCCESS) { return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } } status = setup_psa_key_derivation(&derivation, master_key, alg, random, rlen, (unsigned char const *) label, (size_t) strlen(label), dlen); if (status != PSA_SUCCESS) { psa_key_derivation_abort(&derivation); psa_destroy_key(master_key); return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } status = psa_key_derivation_output_bytes(&derivation, dstbuf, dlen); if (status != PSA_SUCCESS) { psa_key_derivation_abort(&derivation); psa_destroy_key(master_key); return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } status = psa_key_derivation_abort(&derivation); if (status != PSA_SUCCESS) { psa_destroy_key(master_key); return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } if (!mbedtls_svc_key_id_is_null(master_key)) { status = psa_destroy_key(master_key); } if (status != PSA_SUCCESS) { return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } return 0; } #else /* MBEDTLS_USE_PSA_CRYPTO */ MBEDTLS_CHECK_RETURN_CRITICAL static int tls_prf_generic(mbedtls_md_type_t md_type, const unsigned char *secret, size_t slen, const char *label, const unsigned char *random, size_t rlen, unsigned char *dstbuf, size_t dlen) { size_t nb; size_t i, j, k, md_len; unsigned char *tmp; size_t tmp_len = 0; unsigned char h_i[MBEDTLS_MD_MAX_SIZE]; const mbedtls_md_info_t *md_info; mbedtls_md_context_t md_ctx; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; mbedtls_md_init(&md_ctx); if ((md_info = mbedtls_md_info_from_type(md_type)) == NULL) { return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } md_len = mbedtls_md_get_size(md_info); tmp_len = md_len + strlen(label) + rlen; tmp = mbedtls_calloc(1, tmp_len); if (tmp == NULL) { ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; goto exit; } nb = strlen(label); memcpy(tmp + md_len, label, nb); memcpy(tmp + md_len + nb, random, rlen); nb += rlen; /* * Compute P_(secret, label + random)[0..dlen] */ if ((ret = mbedtls_md_setup(&md_ctx, md_info, 1)) != 0) { goto exit; } ret = mbedtls_md_hmac_starts(&md_ctx, secret, slen); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_update(&md_ctx, tmp + md_len, nb); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_finish(&md_ctx, tmp); if (ret != 0) { goto exit; } for (i = 0; i < dlen; i += md_len) { ret = mbedtls_md_hmac_reset(&md_ctx); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_update(&md_ctx, tmp, md_len + nb); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_finish(&md_ctx, h_i); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_reset(&md_ctx); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_update(&md_ctx, tmp, md_len); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_finish(&md_ctx, tmp); if (ret != 0) { goto exit; } k = (i + md_len > dlen) ? dlen % md_len : md_len; for (j = 0; j < k; j++) { dstbuf[i + j] = h_i[j]; } } exit: mbedtls_md_free(&md_ctx); if (tmp != NULL) { mbedtls_platform_zeroize(tmp, tmp_len); } mbedtls_platform_zeroize(h_i, sizeof(h_i)); mbedtls_free(tmp); return ret; } #endif /* MBEDTLS_USE_PSA_CRYPTO */ #if defined(MBEDTLS_SHA256_C) MBEDTLS_CHECK_RETURN_CRITICAL static int tls_prf_sha256(const unsigned char *secret, size_t slen, const char *label, const unsigned char *random, size_t rlen, unsigned char *dstbuf, size_t dlen) { return tls_prf_generic(MBEDTLS_MD_SHA256, secret, slen, label, random, rlen, dstbuf, dlen); } #endif /* MBEDTLS_SHA256_C */ #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384) MBEDTLS_CHECK_RETURN_CRITICAL static int tls_prf_sha384(const unsigned char *secret, size_t slen, const char *label, const unsigned char *random, size_t rlen, unsigned char *dstbuf, size_t dlen) { return tls_prf_generic(MBEDTLS_MD_SHA384, secret, slen, label, random, rlen, dstbuf, dlen); } #endif /* MBEDTLS_SHA512_C && !MBEDTLS_SHA512_NO_SHA384 */ #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ static void ssl_update_checksum_start(mbedtls_ssl_context *, const unsigned char *, size_t); #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ defined(MBEDTLS_SSL_PROTO_TLS1_1) static void ssl_update_checksum_md5sha1(mbedtls_ssl_context *, const unsigned char *, size_t); #endif #if defined(MBEDTLS_SSL_PROTO_SSL3) static void ssl_calc_verify_ssl(const mbedtls_ssl_context *, unsigned char *, size_t *); static void ssl_calc_finished_ssl(mbedtls_ssl_context *, unsigned char *, int); #endif #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) static void ssl_calc_verify_tls(const mbedtls_ssl_context *, unsigned char *, size_t *); static void ssl_calc_finished_tls(mbedtls_ssl_context *, unsigned char *, int); #endif #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA256_C) static void ssl_update_checksum_sha256(mbedtls_ssl_context *, const unsigned char *, size_t); static void ssl_calc_verify_tls_sha256(const mbedtls_ssl_context *, unsigned char *, size_t *); static void ssl_calc_finished_tls_sha256(mbedtls_ssl_context *, unsigned char *, int); #endif #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384) static void ssl_update_checksum_sha384(mbedtls_ssl_context *, const unsigned char *, size_t); static void ssl_calc_verify_tls_sha384(const mbedtls_ssl_context *, unsigned char *, size_t *); static void ssl_calc_finished_tls_sha384(mbedtls_ssl_context *, unsigned char *, int); #endif #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ #if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) && \ defined(MBEDTLS_USE_PSA_CRYPTO) MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_use_opaque_psk(mbedtls_ssl_context const *ssl) { if (ssl->conf->f_psk != NULL) { /* If we've used a callback to select the PSK, * the static configuration is irrelevant. */ if (!mbedtls_svc_key_id_is_null(ssl->handshake->psk_opaque)) { return 1; } return 0; } if (!mbedtls_svc_key_id_is_null(ssl->conf->psk_opaque)) { return 1; } return 0; } #endif /* MBEDTLS_USE_PSA_CRYPTO && MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */ #if defined(MBEDTLS_SSL_EXPORT_KEYS) static mbedtls_tls_prf_types tls_prf_get_type(mbedtls_ssl_tls_prf_cb *tls_prf) { #if defined(MBEDTLS_SSL_PROTO_SSL3) if (tls_prf == ssl3_prf) { return MBEDTLS_SSL_TLS_PRF_SSL3; } else #endif #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) if (tls_prf == tls1_prf) { return MBEDTLS_SSL_TLS_PRF_TLS1; } else #endif #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384) if (tls_prf == tls_prf_sha384) { return MBEDTLS_SSL_TLS_PRF_SHA384; } else #endif #if defined(MBEDTLS_SHA256_C) if (tls_prf == tls_prf_sha256) { return MBEDTLS_SSL_TLS_PRF_SHA256; } else #endif #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ return MBEDTLS_SSL_TLS_PRF_NONE; } #endif /* MBEDTLS_SSL_EXPORT_KEYS */ int mbedtls_ssl_tls_prf(const mbedtls_tls_prf_types prf, const unsigned char *secret, size_t slen, const char *label, const unsigned char *random, size_t rlen, unsigned char *dstbuf, size_t dlen) { mbedtls_ssl_tls_prf_cb *tls_prf = NULL; switch (prf) { #if defined(MBEDTLS_SSL_PROTO_SSL3) case MBEDTLS_SSL_TLS_PRF_SSL3: tls_prf = ssl3_prf; break; #endif /* MBEDTLS_SSL_PROTO_SSL3 */ #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) case MBEDTLS_SSL_TLS_PRF_TLS1: tls_prf = tls1_prf; break; #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384) case MBEDTLS_SSL_TLS_PRF_SHA384: tls_prf = tls_prf_sha384; break; #endif /* MBEDTLS_SHA512_C && !MBEDTLS_SHA512_NO_SHA384 */ #if defined(MBEDTLS_SHA256_C) case MBEDTLS_SSL_TLS_PRF_SHA256: tls_prf = tls_prf_sha256; break; #endif /* MBEDTLS_SHA256_C */ #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ default: return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } return tls_prf(secret, slen, label, random, rlen, dstbuf, dlen); } /* Type for the TLS PRF */ typedef int ssl_tls_prf_t(const unsigned char *, size_t, const char *, const unsigned char *, size_t, unsigned char *, size_t); /* * Populate a transform structure with session keys and all the other * necessary information. * * Parameters: * - [in/out]: transform: structure to populate * [in] must be just initialised with mbedtls_ssl_transform_init() * [out] fully populated, ready for use by mbedtls_ssl_{en,de}crypt_buf() * - [in] ciphersuite * - [in] master * - [in] encrypt_then_mac * - [in] trunc_hmac * - [in] compression * - [in] tls_prf: pointer to PRF to use for key derivation * - [in] randbytes: buffer holding ServerHello.random + ClientHello.random * - [in] minor_ver: SSL/TLS minor version * - [in] endpoint: client or server * - [in] ssl: optionally used for: * - MBEDTLS_SSL_HW_RECORD_ACCEL: whole context (non-const) * - MBEDTLS_SSL_EXPORT_KEYS: ssl->conf->{f,p}_export_keys * - MBEDTLS_DEBUG_C: ssl->conf->{f,p}_dbg */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_populate_transform(mbedtls_ssl_transform *transform, int ciphersuite, const unsigned char master[48], #if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) int encrypt_then_mac, #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ #if defined(MBEDTLS_SSL_TRUNCATED_HMAC) int trunc_hmac, #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ #endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */ #if defined(MBEDTLS_ZLIB_SUPPORT) int compression, #endif ssl_tls_prf_t tls_prf, const unsigned char randbytes[64], int minor_ver, unsigned endpoint, #if !defined(MBEDTLS_SSL_HW_RECORD_ACCEL) const #endif mbedtls_ssl_context *ssl) { int ret = 0; #if defined(MBEDTLS_USE_PSA_CRYPTO) int psa_fallthrough; #endif /* MBEDTLS_USE_PSA_CRYPTO */ int do_mbedtls_cipher_setup; unsigned char keyblk[256]; unsigned char *key1; unsigned char *key2; unsigned char *mac_enc; unsigned char *mac_dec; size_t mac_key_len = 0; size_t iv_copy_len; unsigned keylen; const mbedtls_ssl_ciphersuite_t *ciphersuite_info; const mbedtls_cipher_info_t *cipher_info; const mbedtls_md_info_t *md_info; #if !defined(MBEDTLS_SSL_HW_RECORD_ACCEL) && \ !defined(MBEDTLS_SSL_EXPORT_KEYS) && \ !defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) && \ !defined(MBEDTLS_DEBUG_C) ssl = NULL; /* make sure we don't use it except for those cases */ (void) ssl; #endif /* * Some data just needs copying into the structure */ #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) && \ defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) transform->encrypt_then_mac = encrypt_then_mac; #endif transform->minor_ver = minor_ver; #if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION) memcpy(transform->randbytes, randbytes, sizeof(transform->randbytes)); #endif /* * Get various info structures */ ciphersuite_info = mbedtls_ssl_ciphersuite_from_id(ciphersuite); if (ciphersuite_info == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("ciphersuite info for %d not found", ciphersuite)); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } cipher_info = mbedtls_cipher_info_from_type(ciphersuite_info->cipher); if (cipher_info == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("cipher info for %u not found", ciphersuite_info->cipher)); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } md_info = mbedtls_md_info_from_type(ciphersuite_info->mac); if (md_info == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("mbedtls_md info for %u not found", (unsigned) ciphersuite_info->mac)); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) /* Copy own and peer's CID if the use of the CID * extension has been negotiated. */ if (ssl->handshake->cid_in_use == MBEDTLS_SSL_CID_ENABLED) { MBEDTLS_SSL_DEBUG_MSG(3, ("Copy CIDs into SSL transform")); transform->in_cid_len = ssl->own_cid_len; memcpy(transform->in_cid, ssl->own_cid, ssl->own_cid_len); MBEDTLS_SSL_DEBUG_BUF(3, "Incoming CID", transform->in_cid, transform->in_cid_len); transform->out_cid_len = ssl->handshake->peer_cid_len; memcpy(transform->out_cid, ssl->handshake->peer_cid, ssl->handshake->peer_cid_len); MBEDTLS_SSL_DEBUG_BUF(3, "Outgoing CID", transform->out_cid, transform->out_cid_len); } #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ /* * Compute key block using the PRF */ ret = tls_prf(master, 48, "key expansion", randbytes, 64, keyblk, 256); if (ret != 0) { MBEDTLS_SSL_DEBUG_RET(1, "prf", ret); return ret; } MBEDTLS_SSL_DEBUG_MSG(3, ("ciphersuite = %s", mbedtls_ssl_get_ciphersuite_name(ciphersuite))); MBEDTLS_SSL_DEBUG_BUF(3, "master secret", master, 48); MBEDTLS_SSL_DEBUG_BUF(4, "random bytes", randbytes, 64); MBEDTLS_SSL_DEBUG_BUF(4, "key block", keyblk, 256); /* * Determine the appropriate key, IV and MAC length. */ keylen = cipher_info->key_bitlen / 8; #if defined(MBEDTLS_GCM_C) || \ defined(MBEDTLS_CCM_C) || \ defined(MBEDTLS_CHACHAPOLY_C) if (cipher_info->mode == MBEDTLS_MODE_GCM || cipher_info->mode == MBEDTLS_MODE_CCM || cipher_info->mode == MBEDTLS_MODE_CHACHAPOLY) { size_t explicit_ivlen; transform->maclen = 0; mac_key_len = 0; transform->taglen = ciphersuite_info->flags & MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16; /* All modes haves 96-bit IVs, but the length of the static parts vary * with mode and version: * - For GCM and CCM in TLS 1.2, there's a static IV of 4 Bytes * (to be concatenated with a dynamically chosen IV of 8 Bytes) * - For ChaChaPoly in TLS 1.2, and all modes in TLS 1.3, there's * a static IV of 12 Bytes (to be XOR'ed with the 8 Byte record * sequence number). */ transform->ivlen = 12; #if defined(MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL) if (minor_ver == MBEDTLS_SSL_MINOR_VERSION_4) { transform->fixed_ivlen = 12; } else #endif /* MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */ { if (cipher_info->mode == MBEDTLS_MODE_CHACHAPOLY) { transform->fixed_ivlen = 12; } else { transform->fixed_ivlen = 4; } } /* Minimum length of encrypted record */ explicit_ivlen = transform->ivlen - transform->fixed_ivlen; transform->minlen = explicit_ivlen + transform->taglen; } else #endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C || MBEDTLS_CHACHAPOLY_C */ #if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) if (cipher_info->mode == MBEDTLS_MODE_STREAM || cipher_info->mode == MBEDTLS_MODE_CBC) { /* Initialize HMAC contexts */ if ((ret = mbedtls_md_setup(&transform->md_ctx_enc, md_info, 1)) != 0 || (ret = mbedtls_md_setup(&transform->md_ctx_dec, md_info, 1)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_setup", ret); goto end; } /* Get MAC length */ mac_key_len = mbedtls_md_get_size(md_info); transform->maclen = mac_key_len; #if defined(MBEDTLS_SSL_TRUNCATED_HMAC) /* * If HMAC is to be truncated, we shall keep the leftmost bytes, * (rfc 6066 page 13 or rfc 2104 section 4), * so we only need to adjust the length here. */ if (trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED) { transform->maclen = MBEDTLS_SSL_TRUNCATED_HMAC_LEN; #if defined(MBEDTLS_SSL_TRUNCATED_HMAC_COMPAT) /* Fall back to old, non-compliant version of the truncated * HMAC implementation which also truncates the key * (Mbed TLS versions from 1.3 to 2.6.0) */ mac_key_len = transform->maclen; #endif } #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ /* IV length */ transform->ivlen = cipher_info->iv_size; /* Minimum length */ if (cipher_info->mode == MBEDTLS_MODE_STREAM) { transform->minlen = transform->maclen; } else { /* * GenericBlockCipher: * 1. if EtM is in use: one block plus MAC * otherwise: * first multiple of blocklen greater than maclen * 2. IV except for SSL3 and TLS 1.0 */ #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) if (encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED) { transform->minlen = transform->maclen + cipher_info->block_size; } else #endif { transform->minlen = transform->maclen + cipher_info->block_size - transform->maclen % cipher_info->block_size; } #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) if (minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 || minor_ver == MBEDTLS_SSL_MINOR_VERSION_1) { ; /* No need to adjust minlen */ } else #endif #if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2) if (minor_ver == MBEDTLS_SSL_MINOR_VERSION_2 || minor_ver == MBEDTLS_SSL_MINOR_VERSION_3) { transform->minlen += transform->ivlen; } else #endif { MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen")); ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; goto end; } } } else #endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */ { MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen")); return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } MBEDTLS_SSL_DEBUG_MSG(3, ("keylen: %u, minlen: %u, ivlen: %u, maclen: %u", (unsigned) keylen, (unsigned) transform->minlen, (unsigned) transform->ivlen, (unsigned) transform->maclen)); /* * Finally setup the cipher contexts, IVs and MAC secrets. */ #if defined(MBEDTLS_SSL_CLI_C) if (endpoint == MBEDTLS_SSL_IS_CLIENT) { key1 = keyblk + mac_key_len * 2; key2 = keyblk + mac_key_len * 2 + keylen; mac_enc = keyblk; mac_dec = keyblk + mac_key_len; /* * This is not used in TLS v1.1. */ iv_copy_len = (transform->fixed_ivlen) ? transform->fixed_ivlen : transform->ivlen; memcpy(transform->iv_enc, key2 + keylen, iv_copy_len); memcpy(transform->iv_dec, key2 + keylen + iv_copy_len, iv_copy_len); } else #endif /* MBEDTLS_SSL_CLI_C */ #if defined(MBEDTLS_SSL_SRV_C) if (endpoint == MBEDTLS_SSL_IS_SERVER) { key1 = keyblk + mac_key_len * 2 + keylen; key2 = keyblk + mac_key_len * 2; mac_enc = keyblk + mac_key_len; mac_dec = keyblk; /* * This is not used in TLS v1.1. */ iv_copy_len = (transform->fixed_ivlen) ? transform->fixed_ivlen : transform->ivlen; memcpy(transform->iv_dec, key1 + keylen, iv_copy_len); memcpy(transform->iv_enc, key1 + keylen + iv_copy_len, iv_copy_len); } else #endif /* MBEDTLS_SSL_SRV_C */ { MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen")); ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; goto end; } #if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) #if defined(MBEDTLS_SSL_PROTO_SSL3) if (minor_ver == MBEDTLS_SSL_MINOR_VERSION_0) { if (mac_key_len > sizeof(transform->mac_enc)) { MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen")); ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; goto end; } memcpy(transform->mac_enc, mac_enc, mac_key_len); memcpy(transform->mac_dec, mac_dec, mac_key_len); } else #endif /* MBEDTLS_SSL_PROTO_SSL3 */ #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ defined(MBEDTLS_SSL_PROTO_TLS1_2) if (minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1) { /* For HMAC-based ciphersuites, initialize the HMAC transforms. For AEAD-based ciphersuites, there is nothing to do here. */ if (mac_key_len != 0) { ret = mbedtls_md_hmac_starts(&transform->md_ctx_enc, mac_enc, mac_key_len); if (ret != 0) { goto end; } ret = mbedtls_md_hmac_starts(&transform->md_ctx_dec, mac_dec, mac_key_len); if (ret != 0) { goto end; } } } else #endif { MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen")); ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; goto end; } #endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */ #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) if (mbedtls_ssl_hw_record_init != NULL) { ret = 0; MBEDTLS_SSL_DEBUG_MSG(2, ("going for mbedtls_ssl_hw_record_init()")); if ((ret = mbedtls_ssl_hw_record_init(ssl, key1, key2, keylen, transform->iv_enc, transform->iv_dec, iv_copy_len, mac_enc, mac_dec, mac_key_len)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_hw_record_init", ret); ret = MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; goto end; } } #else ((void) mac_dec); ((void) mac_enc); #endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */ #if defined(MBEDTLS_SSL_EXPORT_KEYS) if (ssl->conf->f_export_keys != NULL) { ssl->conf->f_export_keys(ssl->conf->p_export_keys, master, keyblk, mac_key_len, keylen, iv_copy_len); } if (ssl->conf->f_export_keys_ext != NULL) { ssl->conf->f_export_keys_ext(ssl->conf->p_export_keys, master, keyblk, mac_key_len, keylen, iv_copy_len, randbytes + 32, randbytes, tls_prf_get_type(tls_prf)); } #endif do_mbedtls_cipher_setup = 1; #if defined(MBEDTLS_USE_PSA_CRYPTO) /* Only use PSA-based ciphers for TLS-1.2. * That's relevant at least for TLS-1.0, where * we assume that mbedtls_cipher_crypt() updates * the structure field for the IV, which the PSA-based * implementation currently doesn't. */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) if (minor_ver == MBEDTLS_SSL_MINOR_VERSION_3) { ret = mbedtls_cipher_setup_psa(&transform->cipher_ctx_enc, cipher_info, transform->taglen); if (ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_setup_psa", ret); goto end; } if (ret == 0) { MBEDTLS_SSL_DEBUG_MSG(3, ("Successfully setup PSA-based encryption cipher context")); psa_fallthrough = 0; } else { MBEDTLS_SSL_DEBUG_MSG(1, ( "Failed to setup PSA-based cipher context for record encryption - fall through to default setup.")); psa_fallthrough = 1; } } else { psa_fallthrough = 1; } #else psa_fallthrough = 1; #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ if (psa_fallthrough == 0) { do_mbedtls_cipher_setup = 0; } #endif /* MBEDTLS_USE_PSA_CRYPTO */ if (do_mbedtls_cipher_setup && (ret = mbedtls_cipher_setup(&transform->cipher_ctx_enc, cipher_info)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_setup", ret); goto end; } do_mbedtls_cipher_setup = 1; #if defined(MBEDTLS_USE_PSA_CRYPTO) /* Only use PSA-based ciphers for TLS-1.2. * That's relevant at least for TLS-1.0, where * we assume that mbedtls_cipher_crypt() updates * the structure field for the IV, which the PSA-based * implementation currently doesn't. */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) if (minor_ver == MBEDTLS_SSL_MINOR_VERSION_3) { ret = mbedtls_cipher_setup_psa(&transform->cipher_ctx_dec, cipher_info, transform->taglen); if (ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_setup_psa", ret); goto end; } if (ret == 0) { MBEDTLS_SSL_DEBUG_MSG(3, ("Successfully setup PSA-based decryption cipher context")); psa_fallthrough = 0; } else { MBEDTLS_SSL_DEBUG_MSG(1, ( "Failed to setup PSA-based cipher context for record decryption - fall through to default setup.")); psa_fallthrough = 1; } } else { psa_fallthrough = 1; } #else psa_fallthrough = 1; #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ if (psa_fallthrough == 0) { do_mbedtls_cipher_setup = 0; } #endif /* MBEDTLS_USE_PSA_CRYPTO */ if (do_mbedtls_cipher_setup && (ret = mbedtls_cipher_setup(&transform->cipher_ctx_dec, cipher_info)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_setup", ret); goto end; } if ((ret = mbedtls_cipher_setkey(&transform->cipher_ctx_enc, key1, cipher_info->key_bitlen, MBEDTLS_ENCRYPT)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_setkey", ret); goto end; } if ((ret = mbedtls_cipher_setkey(&transform->cipher_ctx_dec, key2, cipher_info->key_bitlen, MBEDTLS_DECRYPT)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_setkey", ret); goto end; } #if defined(MBEDTLS_CIPHER_MODE_CBC) if (cipher_info->mode == MBEDTLS_MODE_CBC) { if ((ret = mbedtls_cipher_set_padding_mode(&transform->cipher_ctx_enc, MBEDTLS_PADDING_NONE)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_set_padding_mode", ret); goto end; } if ((ret = mbedtls_cipher_set_padding_mode(&transform->cipher_ctx_dec, MBEDTLS_PADDING_NONE)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_set_padding_mode", ret); goto end; } } #endif /* MBEDTLS_CIPHER_MODE_CBC */ /* Initialize Zlib contexts */ #if defined(MBEDTLS_ZLIB_SUPPORT) if (compression == MBEDTLS_SSL_COMPRESS_DEFLATE) { MBEDTLS_SSL_DEBUG_MSG(3, ("Initializing zlib states")); memset(&transform->ctx_deflate, 0, sizeof(transform->ctx_deflate)); memset(&transform->ctx_inflate, 0, sizeof(transform->ctx_inflate)); if (deflateInit(&transform->ctx_deflate, Z_DEFAULT_COMPRESSION) != Z_OK || inflateInit(&transform->ctx_inflate) != Z_OK) { MBEDTLS_SSL_DEBUG_MSG(1, ("Failed to initialize compression")); ret = MBEDTLS_ERR_SSL_COMPRESSION_FAILED; goto end; } } #endif /* MBEDTLS_ZLIB_SUPPORT */ end: mbedtls_platform_zeroize(keyblk, sizeof(keyblk)); return ret; } /* * Set appropriate PRF function and other SSL / TLS 1.0/1.1 / TLS1.2 functions * * Inputs: * - SSL/TLS minor version * - hash associated with the ciphersuite (only used by TLS 1.2) * * Outputs: * - the tls_prf, calc_verify and calc_finished members of handshake structure */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_set_handshake_prfs(mbedtls_ssl_handshake_params *handshake, int minor_ver, mbedtls_md_type_t hash) { #if !defined(MBEDTLS_SSL_PROTO_TLS1_2) || \ !(defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)) (void) hash; #endif #if defined(MBEDTLS_SSL_PROTO_SSL3) if (minor_ver == MBEDTLS_SSL_MINOR_VERSION_0) { handshake->tls_prf = ssl3_prf; handshake->calc_verify = ssl_calc_verify_ssl; handshake->calc_finished = ssl_calc_finished_ssl; } else #endif #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) if (minor_ver < MBEDTLS_SSL_MINOR_VERSION_3) { handshake->tls_prf = tls1_prf; handshake->calc_verify = ssl_calc_verify_tls; handshake->calc_finished = ssl_calc_finished_tls; } else #endif #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384) if (minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 && hash == MBEDTLS_MD_SHA384) { handshake->tls_prf = tls_prf_sha384; handshake->calc_verify = ssl_calc_verify_tls_sha384; handshake->calc_finished = ssl_calc_finished_tls_sha384; } else #endif #if defined(MBEDTLS_SHA256_C) if (minor_ver == MBEDTLS_SSL_MINOR_VERSION_3) { handshake->tls_prf = tls_prf_sha256; handshake->calc_verify = ssl_calc_verify_tls_sha256; handshake->calc_finished = ssl_calc_finished_tls_sha256; } else #endif #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ { return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } return 0; } /* * Compute master secret if needed * * Parameters: * [in/out] handshake * [in] resume, premaster, extended_ms, calc_verify, tls_prf * (PSA-PSK) ciphersuite_info, psk_opaque * [out] premaster (cleared) * [out] master * [in] ssl: optionally used for debugging, EMS and PSA-PSK * debug: conf->f_dbg, conf->p_dbg * EMS: passed to calc_verify (debug + (SSL3) session_negotiate) * PSA-PSA: minor_ver, conf */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_compute_master(mbedtls_ssl_handshake_params *handshake, unsigned char *master, const mbedtls_ssl_context *ssl) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; /* cf. RFC 5246, Section 8.1: * "The master secret is always exactly 48 bytes in length." */ size_t const master_secret_len = 48; #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) unsigned char session_hash[48]; #endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ /* The label for the KDF used for key expansion. * This is either "master secret" or "extended master secret" * depending on whether the Extended Master Secret extension * is used. */ char const *lbl = "master secret"; /* The salt for the KDF used for key expansion. * - If the Extended Master Secret extension is not used, * this is ClientHello.Random + ServerHello.Random * (see Sect. 8.1 in RFC 5246). * - If the Extended Master Secret extension is used, * this is the transcript of the handshake so far. * (see Sect. 4 in RFC 7627). */ unsigned char const *salt = handshake->randbytes; size_t salt_len = 64; #if !defined(MBEDTLS_DEBUG_C) && \ !defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) && \ !(defined(MBEDTLS_USE_PSA_CRYPTO) && \ defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)) ssl = NULL; /* make sure we don't use it except for those cases */ (void) ssl; #endif if (handshake->resume != 0) { MBEDTLS_SSL_DEBUG_MSG(3, ("no premaster (session resumed)")); return 0; } #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) if (handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED) { lbl = "extended master secret"; salt = session_hash; handshake->calc_verify(ssl, session_hash, &salt_len); MBEDTLS_SSL_DEBUG_BUF(3, "session hash for extended master secret", session_hash, salt_len); } #endif /* MBEDTLS_SSL_EXTENDED_MS_ENABLED */ #if defined(MBEDTLS_USE_PSA_CRYPTO) && \ defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) if (handshake->ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK && ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 && ssl_use_opaque_psk(ssl) == 1) { /* Perform PSK-to-MS expansion in a single step. */ psa_status_t status; psa_algorithm_t alg; psa_key_id_t psk; psa_key_derivation_operation_t derivation = PSA_KEY_DERIVATION_OPERATION_INIT; mbedtls_md_type_t hash_alg = handshake->ciphersuite_info->mac; MBEDTLS_SSL_DEBUG_MSG(2, ("perform PSA-based PSK-to-MS expansion")); psk = mbedtls_ssl_get_opaque_psk(ssl); if (hash_alg == MBEDTLS_MD_SHA384) { alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_384); } else { alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_256); } status = setup_psa_key_derivation(&derivation, psk, alg, salt, salt_len, (unsigned char const *) lbl, (size_t) strlen(lbl), master_secret_len); if (status != PSA_SUCCESS) { psa_key_derivation_abort(&derivation); return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } status = psa_key_derivation_output_bytes(&derivation, master, master_secret_len); if (status != PSA_SUCCESS) { psa_key_derivation_abort(&derivation); return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } status = psa_key_derivation_abort(&derivation); if (status != PSA_SUCCESS) { return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } } else #endif { ret = handshake->tls_prf(handshake->premaster, handshake->pmslen, lbl, salt, salt_len, master, master_secret_len); if (ret != 0) { MBEDTLS_SSL_DEBUG_RET(1, "prf", ret); return ret; } MBEDTLS_SSL_DEBUG_BUF(3, "premaster secret", handshake->premaster, handshake->pmslen); mbedtls_platform_zeroize(handshake->premaster, sizeof(handshake->premaster)); } return 0; } int mbedtls_ssl_derive_keys(mbedtls_ssl_context *ssl) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; const mbedtls_ssl_ciphersuite_t * const ciphersuite_info = ssl->handshake->ciphersuite_info; MBEDTLS_SSL_DEBUG_MSG(2, ("=> derive keys")); /* Set PRF, calc_verify and calc_finished function pointers */ ret = ssl_set_handshake_prfs(ssl->handshake, ssl->minor_ver, ciphersuite_info->mac); if (ret != 0) { MBEDTLS_SSL_DEBUG_RET(1, "ssl_set_handshake_prfs", ret); return ret; } /* Compute master secret if needed */ ret = ssl_compute_master(ssl->handshake, ssl->session_negotiate->master, ssl); if (ret != 0) { MBEDTLS_SSL_DEBUG_RET(1, "ssl_compute_master", ret); return ret; } /* Swap the client and server random values: * - MS derivation wanted client+server (RFC 5246 8.1) * - key derivation wants server+client (RFC 5246 6.3) */ { unsigned char tmp[64]; memcpy(tmp, ssl->handshake->randbytes, 64); memcpy(ssl->handshake->randbytes, tmp + 32, 32); memcpy(ssl->handshake->randbytes + 32, tmp, 32); mbedtls_platform_zeroize(tmp, sizeof(tmp)); } /* Populate transform structure */ ret = ssl_populate_transform(ssl->transform_negotiate, ssl->session_negotiate->ciphersuite, ssl->session_negotiate->master, #if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) ssl->session_negotiate->encrypt_then_mac, #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ #if defined(MBEDTLS_SSL_TRUNCATED_HMAC) ssl->session_negotiate->trunc_hmac, #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ #endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */ #if defined(MBEDTLS_ZLIB_SUPPORT) ssl->session_negotiate->compression, #endif ssl->handshake->tls_prf, ssl->handshake->randbytes, ssl->minor_ver, ssl->conf->endpoint, ssl); if (ret != 0) { MBEDTLS_SSL_DEBUG_RET(1, "ssl_populate_transform", ret); return ret; } /* We no longer need Server/ClientHello.random values */ mbedtls_platform_zeroize(ssl->handshake->randbytes, sizeof(ssl->handshake->randbytes)); /* Allocate compression buffer */ #if defined(MBEDTLS_ZLIB_SUPPORT) if (ssl->session_negotiate->compression == MBEDTLS_SSL_COMPRESS_DEFLATE && ssl->compress_buf == NULL) { MBEDTLS_SSL_DEBUG_MSG(3, ("Allocating compression buffer")); ssl->compress_buf = mbedtls_calloc(1, MBEDTLS_SSL_COMPRESS_BUFFER_LEN); if (ssl->compress_buf == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("alloc(%d bytes) failed", MBEDTLS_SSL_COMPRESS_BUFFER_LEN)); return MBEDTLS_ERR_SSL_ALLOC_FAILED; } } #endif MBEDTLS_SSL_DEBUG_MSG(2, ("<= derive keys")); return 0; } #if defined(MBEDTLS_SSL_PROTO_SSL3) void ssl_calc_verify_ssl(const mbedtls_ssl_context *ssl, unsigned char *hash, size_t *hlen) { mbedtls_md5_context md5; mbedtls_sha1_context sha1; unsigned char pad_1[48]; unsigned char pad_2[48]; MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc verify ssl")); mbedtls_md5_init(&md5); mbedtls_sha1_init(&sha1); mbedtls_md5_clone(&md5, &ssl->handshake->fin_md5); mbedtls_sha1_clone(&sha1, &ssl->handshake->fin_sha1); memset(pad_1, 0x36, 48); memset(pad_2, 0x5C, 48); mbedtls_md5_update_ret(&md5, ssl->session_negotiate->master, 48); mbedtls_md5_update_ret(&md5, pad_1, 48); mbedtls_md5_finish_ret(&md5, hash); mbedtls_md5_starts_ret(&md5); mbedtls_md5_update_ret(&md5, ssl->session_negotiate->master, 48); mbedtls_md5_update_ret(&md5, pad_2, 48); mbedtls_md5_update_ret(&md5, hash, 16); mbedtls_md5_finish_ret(&md5, hash); mbedtls_sha1_update_ret(&sha1, ssl->session_negotiate->master, 48); mbedtls_sha1_update_ret(&sha1, pad_1, 40); mbedtls_sha1_finish_ret(&sha1, hash + 16); mbedtls_sha1_starts_ret(&sha1); mbedtls_sha1_update_ret(&sha1, ssl->session_negotiate->master, 48); mbedtls_sha1_update_ret(&sha1, pad_2, 40); mbedtls_sha1_update_ret(&sha1, hash + 16, 20); mbedtls_sha1_finish_ret(&sha1, hash + 16); *hlen = 36; MBEDTLS_SSL_DEBUG_BUF(3, "calculated verify result", hash, *hlen); MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc verify")); mbedtls_md5_free(&md5); mbedtls_sha1_free(&sha1); return; } #endif /* MBEDTLS_SSL_PROTO_SSL3 */ #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) void ssl_calc_verify_tls(const mbedtls_ssl_context *ssl, unsigned char *hash, size_t *hlen) { mbedtls_md5_context md5; mbedtls_sha1_context sha1; MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc verify tls")); mbedtls_md5_init(&md5); mbedtls_sha1_init(&sha1); mbedtls_md5_clone(&md5, &ssl->handshake->fin_md5); mbedtls_sha1_clone(&sha1, &ssl->handshake->fin_sha1); mbedtls_md5_finish_ret(&md5, hash); mbedtls_sha1_finish_ret(&sha1, hash + 16); *hlen = 36; MBEDTLS_SSL_DEBUG_BUF(3, "calculated verify result", hash, *hlen); MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc verify")); mbedtls_md5_free(&md5); mbedtls_sha1_free(&sha1); return; } #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA256_C) void ssl_calc_verify_tls_sha256(const mbedtls_ssl_context *ssl, unsigned char *hash, size_t *hlen) { #if defined(MBEDTLS_USE_PSA_CRYPTO) size_t hash_size; psa_status_t status; psa_hash_operation_t sha256_psa = psa_hash_operation_init(); MBEDTLS_SSL_DEBUG_MSG(2, ("=> PSA calc verify sha256")); status = psa_hash_clone(&ssl->handshake->fin_sha256_psa, &sha256_psa); if (status != PSA_SUCCESS) { MBEDTLS_SSL_DEBUG_MSG(2, ("PSA hash clone failed")); return; } status = psa_hash_finish(&sha256_psa, hash, 32, &hash_size); if (status != PSA_SUCCESS) { MBEDTLS_SSL_DEBUG_MSG(2, ("PSA hash finish failed")); return; } *hlen = 32; MBEDTLS_SSL_DEBUG_BUF(3, "PSA calculated verify result", hash, *hlen); MBEDTLS_SSL_DEBUG_MSG(2, ("<= PSA calc verify")); #else mbedtls_sha256_context sha256; mbedtls_sha256_init(&sha256); MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc verify sha256")); mbedtls_sha256_clone(&sha256, &ssl->handshake->fin_sha256); mbedtls_sha256_finish_ret(&sha256, hash); *hlen = 32; MBEDTLS_SSL_DEBUG_BUF(3, "calculated verify result", hash, *hlen); MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc verify")); mbedtls_sha256_free(&sha256); #endif /* MBEDTLS_USE_PSA_CRYPTO */ return; } #endif /* MBEDTLS_SHA256_C */ #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384) void ssl_calc_verify_tls_sha384(const mbedtls_ssl_context *ssl, unsigned char *hash, size_t *hlen) { #if defined(MBEDTLS_USE_PSA_CRYPTO) size_t hash_size; psa_status_t status; psa_hash_operation_t sha384_psa = psa_hash_operation_init(); MBEDTLS_SSL_DEBUG_MSG(2, ("=> PSA calc verify sha384")); status = psa_hash_clone(&ssl->handshake->fin_sha384_psa, &sha384_psa); if (status != PSA_SUCCESS) { MBEDTLS_SSL_DEBUG_MSG(2, ("PSA hash clone failed")); return; } status = psa_hash_finish(&sha384_psa, hash, 48, &hash_size); if (status != PSA_SUCCESS) { MBEDTLS_SSL_DEBUG_MSG(2, ("PSA hash finish failed")); return; } *hlen = 48; MBEDTLS_SSL_DEBUG_BUF(3, "PSA calculated verify result", hash, *hlen); MBEDTLS_SSL_DEBUG_MSG(2, ("<= PSA calc verify")); #else mbedtls_sha512_context sha512; mbedtls_sha512_init(&sha512); MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc verify sha384")); mbedtls_sha512_clone(&sha512, &ssl->handshake->fin_sha512); mbedtls_sha512_finish_ret(&sha512, hash); *hlen = 48; MBEDTLS_SSL_DEBUG_BUF(3, "calculated verify result", hash, *hlen); MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc verify")); mbedtls_sha512_free(&sha512); #endif /* MBEDTLS_USE_PSA_CRYPTO */ return; } #endif /* MBEDTLS_SHA512_C && !MBEDTLS_SHA512_NO_SHA384 */ #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) int mbedtls_ssl_psk_derive_premaster(mbedtls_ssl_context *ssl, mbedtls_key_exchange_type_t key_ex) { unsigned char *p = ssl->handshake->premaster; unsigned char *end = p + sizeof(ssl->handshake->premaster); const unsigned char *psk = NULL; size_t psk_len = 0; if (mbedtls_ssl_get_psk(ssl, &psk, &psk_len) == MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED) { /* * This should never happen because the existence of a PSK is always * checked before calling this function */ MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen")); return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } /* * PMS = struct { * opaque other_secret<0..2^16-1>; * opaque psk<0..2^16-1>; * }; * with "other_secret" depending on the particular key exchange */ #if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) if (key_ex == MBEDTLS_KEY_EXCHANGE_PSK) { if (end - p < 2) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } MBEDTLS_PUT_UINT16_BE(psk_len, p, 0); p += 2; if (end < p || (size_t) (end - p) < psk_len) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } memset(p, 0, psk_len); p += psk_len; } else #endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */ #if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) if (key_ex == MBEDTLS_KEY_EXCHANGE_RSA_PSK) { /* * other_secret already set by the ClientKeyExchange message, * and is 48 bytes long */ if (end - p < 2) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } *p++ = 0; *p++ = 48; p += 48; } else #endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ #if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) if (key_ex == MBEDTLS_KEY_EXCHANGE_DHE_PSK) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; size_t len; /* Write length only when we know the actual value */ if ((ret = mbedtls_dhm_calc_secret(&ssl->handshake->dhm_ctx, p + 2, end - (p + 2), &len, ssl->conf->f_rng, ssl->conf->p_rng)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_dhm_calc_secret", ret); return ret; } MBEDTLS_PUT_UINT16_BE(len, p, 0); p += 2 + len; MBEDTLS_SSL_DEBUG_MPI(3, "DHM: K ", &ssl->handshake->dhm_ctx.K); } else #endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ #if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) if (key_ex == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; size_t zlen; if ((ret = mbedtls_ecdh_calc_secret(&ssl->handshake->ecdh_ctx, &zlen, p + 2, end - (p + 2), ssl->conf->f_rng, ssl->conf->p_rng)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ecdh_calc_secret", ret); return ret; } MBEDTLS_PUT_UINT16_BE(zlen, p, 0); p += 2 + zlen; MBEDTLS_SSL_DEBUG_ECDH(3, &ssl->handshake->ecdh_ctx, MBEDTLS_DEBUG_ECDH_Z); } else #endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ { MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen")); return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } /* opaque psk<0..2^16-1>; */ if (end - p < 2) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } MBEDTLS_PUT_UINT16_BE(psk_len, p, 0); p += 2; if (end < p || (size_t) (end - p) < psk_len) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } memcpy(p, psk, psk_len); p += psk_len; ssl->handshake->pmslen = p - ssl->handshake->premaster; return 0; } #endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */ #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION) MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_write_hello_request(mbedtls_ssl_context *ssl); #if defined(MBEDTLS_SSL_PROTO_DTLS) int mbedtls_ssl_resend_hello_request(mbedtls_ssl_context *ssl) { /* If renegotiation is not enforced, retransmit until we would reach max * timeout if we were using the usual handshake doubling scheme */ if (ssl->conf->renego_max_records < 0) { uint32_t ratio = ssl->conf->hs_timeout_max / ssl->conf->hs_timeout_min + 1; unsigned char doublings = 1; while (ratio != 0) { ++doublings; ratio >>= 1; } if (++ssl->renego_records_seen > doublings) { MBEDTLS_SSL_DEBUG_MSG(2, ("no longer retransmitting hello request")); return 0; } } return ssl_write_hello_request(ssl); } #endif #endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */ #if defined(MBEDTLS_X509_CRT_PARSE_C) static void ssl_clear_peer_cert(mbedtls_ssl_session *session) { #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) if (session->peer_cert != NULL) { mbedtls_x509_crt_free(session->peer_cert); mbedtls_free(session->peer_cert); session->peer_cert = NULL; } #else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ if (session->peer_cert_digest != NULL) { /* Zeroization is not necessary. */ mbedtls_free(session->peer_cert_digest); session->peer_cert_digest = NULL; session->peer_cert_digest_type = MBEDTLS_MD_NONE; session->peer_cert_digest_len = 0; } #endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ } #endif /* MBEDTLS_X509_CRT_PARSE_C */ /* * Handshake functions */ #if !defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) /* No certificate support -> dummy functions */ int mbedtls_ssl_write_certificate(mbedtls_ssl_context *ssl) { const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->handshake->ciphersuite_info; MBEDTLS_SSL_DEBUG_MSG(2, ("=> write certificate")); if (!mbedtls_ssl_ciphersuite_uses_srv_cert(ciphersuite_info)) { MBEDTLS_SSL_DEBUG_MSG(2, ("<= skip write certificate")); ssl->state++; return 0; } MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen")); return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } int mbedtls_ssl_parse_certificate(mbedtls_ssl_context *ssl) { const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->handshake->ciphersuite_info; MBEDTLS_SSL_DEBUG_MSG(2, ("=> parse certificate")); if (!mbedtls_ssl_ciphersuite_uses_srv_cert(ciphersuite_info)) { MBEDTLS_SSL_DEBUG_MSG(2, ("<= skip parse certificate")); ssl->state++; return 0; } MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen")); return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } #else /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ /* Some certificate support -> implement write and parse */ int mbedtls_ssl_write_certificate(mbedtls_ssl_context *ssl) { int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; size_t i, n; const mbedtls_x509_crt *crt; const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->handshake->ciphersuite_info; MBEDTLS_SSL_DEBUG_MSG(2, ("=> write certificate")); if (!mbedtls_ssl_ciphersuite_uses_srv_cert(ciphersuite_info)) { MBEDTLS_SSL_DEBUG_MSG(2, ("<= skip write certificate")); ssl->state++; return 0; } #if defined(MBEDTLS_SSL_CLI_C) if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) { if (ssl->client_auth == 0) { MBEDTLS_SSL_DEBUG_MSG(2, ("<= skip write certificate")); ssl->state++; return 0; } #if defined(MBEDTLS_SSL_PROTO_SSL3) /* * If using SSLv3 and got no cert, send an Alert message * (otherwise an empty Certificate message will be sent). */ if (mbedtls_ssl_own_cert(ssl) == NULL && ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0) { ssl->out_msglen = 2; ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT; ssl->out_msg[0] = MBEDTLS_SSL_ALERT_LEVEL_WARNING; ssl->out_msg[1] = MBEDTLS_SSL_ALERT_MSG_NO_CERT; MBEDTLS_SSL_DEBUG_MSG(2, ("got no certificate to send")); goto write_msg; } #endif /* MBEDTLS_SSL_PROTO_SSL3 */ } #endif /* MBEDTLS_SSL_CLI_C */ #if defined(MBEDTLS_SSL_SRV_C) if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) { if (mbedtls_ssl_own_cert(ssl) == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("got no certificate to send")); return MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED; } } #endif MBEDTLS_SSL_DEBUG_CRT(3, "own certificate", mbedtls_ssl_own_cert(ssl)); /* * 0 . 0 handshake type * 1 . 3 handshake length * 4 . 6 length of all certs * 7 . 9 length of cert. 1 * 10 . n-1 peer certificate * n . n+2 length of cert. 2 * n+3 . ... upper level cert, etc. */ i = 7; crt = mbedtls_ssl_own_cert(ssl); while (crt != NULL) { n = crt->raw.len; if (n > MBEDTLS_SSL_OUT_CONTENT_LEN - 3 - i) { MBEDTLS_SSL_DEBUG_MSG(1, ("certificate too large, %" MBEDTLS_PRINTF_SIZET " > %" MBEDTLS_PRINTF_SIZET, i + 3 + n, (size_t) MBEDTLS_SSL_OUT_CONTENT_LEN)); return MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE; } ssl->out_msg[i] = MBEDTLS_BYTE_2(n); ssl->out_msg[i + 1] = MBEDTLS_BYTE_1(n); ssl->out_msg[i + 2] = MBEDTLS_BYTE_0(n); i += 3; memcpy(ssl->out_msg + i, crt->raw.p, n); i += n; crt = crt->next; } ssl->out_msg[4] = MBEDTLS_BYTE_2(i - 7); ssl->out_msg[5] = MBEDTLS_BYTE_1(i - 7); ssl->out_msg[6] = MBEDTLS_BYTE_0(i - 7); ssl->out_msglen = i; ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE; #if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_CLI_C) write_msg: #endif ssl->state++; if ((ret = mbedtls_ssl_write_handshake_msg(ssl)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_write_handshake_msg", ret); return ret; } MBEDTLS_SSL_DEBUG_MSG(2, ("<= write certificate")); return ret; } #if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C) #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_check_peer_crt_unchanged(mbedtls_ssl_context *ssl, unsigned char *crt_buf, size_t crt_buf_len) { mbedtls_x509_crt const * const peer_crt = ssl->session->peer_cert; if (peer_crt == NULL) { return -1; } if (peer_crt->raw.len != crt_buf_len) { return -1; } return memcmp(peer_crt->raw.p, crt_buf, peer_crt->raw.len); } #else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_check_peer_crt_unchanged(mbedtls_ssl_context *ssl, unsigned char *crt_buf, size_t crt_buf_len) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; unsigned char const * const peer_cert_digest = ssl->session->peer_cert_digest; mbedtls_md_type_t const peer_cert_digest_type = ssl->session->peer_cert_digest_type; mbedtls_md_info_t const * const digest_info = mbedtls_md_info_from_type(peer_cert_digest_type); unsigned char tmp_digest[MBEDTLS_SSL_PEER_CERT_DIGEST_MAX_LEN]; size_t digest_len; if (peer_cert_digest == NULL || digest_info == NULL) { return -1; } digest_len = mbedtls_md_get_size(digest_info); if (digest_len > MBEDTLS_SSL_PEER_CERT_DIGEST_MAX_LEN) { return -1; } ret = mbedtls_md(digest_info, crt_buf, crt_buf_len, tmp_digest); if (ret != 0) { return -1; } return memcmp(tmp_digest, peer_cert_digest, digest_len); } #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ #endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */ /* * Once the certificate message is read, parse it into a cert chain and * perform basic checks, but leave actual verification to the caller */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_parse_certificate_chain(mbedtls_ssl_context *ssl, mbedtls_x509_crt *chain) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; #if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C) int crt_cnt = 0; #endif size_t i, n; uint8_t alert; if (ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate message")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE); return MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE; } if (ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE || ssl->in_hslen < mbedtls_ssl_hs_hdr_len(ssl) + 3 + 3) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate message")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR); return MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE; } i = mbedtls_ssl_hs_hdr_len(ssl); /* * Same message structure as in mbedtls_ssl_write_certificate() */ n = (ssl->in_msg[i+1] << 8) | ssl->in_msg[i+2]; if (ssl->in_msg[i] != 0 || ssl->in_hslen != n + 3 + mbedtls_ssl_hs_hdr_len(ssl)) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate message")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR); return MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE; } /* Make &ssl->in_msg[i] point to the beginning of the CRT chain. */ i += 3; /* Iterate through and parse the CRTs in the provided chain. */ while (i < ssl->in_hslen) { /* Check that there's room for the next CRT's length fields. */ if (i + 3 > ssl->in_hslen) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate message")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR); return MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE; } /* In theory, the CRT can be up to 2**24 Bytes, but we don't support * anything beyond 2**16 ~ 64K. */ if (ssl->in_msg[i] != 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate message")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR); return MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE; } /* Read length of the next CRT in the chain. */ n = ((unsigned int) ssl->in_msg[i + 1] << 8) | (unsigned int) ssl->in_msg[i + 2]; i += 3; if (n < 128 || i + n > ssl->in_hslen) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate message")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR); return MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE; } /* Check if we're handling the first CRT in the chain. */ #if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C) if (crt_cnt++ == 0 && ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT && ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS) { /* During client-side renegotiation, check that the server's * end-CRTs hasn't changed compared to the initial handshake, * mitigating the triple handshake attack. On success, reuse * the original end-CRT instead of parsing it again. */ MBEDTLS_SSL_DEBUG_MSG(3, ("Check that peer CRT hasn't changed during renegotiation")); if (ssl_check_peer_crt_unchanged(ssl, &ssl->in_msg[i], n) != 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("new server cert during renegotiation")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED); return MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE; } /* Now we can safely free the original chain. */ ssl_clear_peer_cert(ssl->session); } #endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */ /* Parse the next certificate in the chain. */ #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) ret = mbedtls_x509_crt_parse_der(chain, ssl->in_msg + i, n); #else /* If we don't need to store the CRT chain permanently, parse * it in-place from the input buffer instead of making a copy. */ ret = mbedtls_x509_crt_parse_der_nocopy(chain, ssl->in_msg + i, n); #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ switch (ret) { case 0: /*ok*/ case MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG + MBEDTLS_ERR_OID_NOT_FOUND: /* Ignore certificate with an unknown algorithm: maybe a prior certificate was already trusted. */ break; case MBEDTLS_ERR_X509_ALLOC_FAILED: alert = MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR; goto crt_parse_der_failed; case MBEDTLS_ERR_X509_UNKNOWN_VERSION: alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; goto crt_parse_der_failed; default: alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT; crt_parse_der_failed: mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, alert); MBEDTLS_SSL_DEBUG_RET(1, " mbedtls_x509_crt_parse_der", ret); return ret; } i += n; } MBEDTLS_SSL_DEBUG_CRT(3, "peer certificate", chain); return 0; } #if defined(MBEDTLS_SSL_SRV_C) MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_srv_check_client_no_crt_notification(mbedtls_ssl_context *ssl) { if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) { return -1; } #if defined(MBEDTLS_SSL_PROTO_SSL3) /* * Check if the client sent an empty certificate */ if (ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0) { if (ssl->in_msglen == 2 && ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT && ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING && ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT) { MBEDTLS_SSL_DEBUG_MSG(1, ("SSLv3 client has no certificate")); return 0; } return -1; } #endif /* MBEDTLS_SSL_PROTO_SSL3 */ #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ defined(MBEDTLS_SSL_PROTO_TLS1_2) if (ssl->in_hslen == 3 + mbedtls_ssl_hs_hdr_len(ssl) && ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE && memcmp(ssl->in_msg + mbedtls_ssl_hs_hdr_len(ssl), "\0\0\0", 3) == 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("TLSv1 client has no certificate")); return 0; } return -1; #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ MBEDTLS_SSL_PROTO_TLS1_2 */ } #endif /* MBEDTLS_SSL_SRV_C */ /* Check if a certificate message is expected. * Return either * - SSL_CERTIFICATE_EXPECTED, or * - SSL_CERTIFICATE_SKIP * indicating whether a Certificate message is expected or not. */ #define SSL_CERTIFICATE_EXPECTED 0 #define SSL_CERTIFICATE_SKIP 1 MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_parse_certificate_coordinate(mbedtls_ssl_context *ssl, int authmode) { const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->handshake->ciphersuite_info; if (!mbedtls_ssl_ciphersuite_uses_srv_cert(ciphersuite_info)) { return SSL_CERTIFICATE_SKIP; } #if defined(MBEDTLS_SSL_SRV_C) if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) { if (ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK) { return SSL_CERTIFICATE_SKIP; } if (authmode == MBEDTLS_SSL_VERIFY_NONE) { ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_SKIP_VERIFY; return SSL_CERTIFICATE_SKIP; } } #else ((void) authmode); #endif /* MBEDTLS_SSL_SRV_C */ return SSL_CERTIFICATE_EXPECTED; } MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_parse_certificate_verify(mbedtls_ssl_context *ssl, int authmode, mbedtls_x509_crt *chain, void *rs_ctx) { int ret = 0; const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->handshake->ciphersuite_info; int have_ca_chain = 0; int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *); void *p_vrfy; if (authmode == MBEDTLS_SSL_VERIFY_NONE) { return 0; } if (ssl->f_vrfy != NULL) { MBEDTLS_SSL_DEBUG_MSG(3, ("Use context-specific verification callback")); f_vrfy = ssl->f_vrfy; p_vrfy = ssl->p_vrfy; } else { MBEDTLS_SSL_DEBUG_MSG(3, ("Use configuration-specific verification callback")); f_vrfy = ssl->conf->f_vrfy; p_vrfy = ssl->conf->p_vrfy; } /* * Main check: verify certificate */ #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) if (ssl->conf->f_ca_cb != NULL) { ((void) rs_ctx); have_ca_chain = 1; MBEDTLS_SSL_DEBUG_MSG(3, ("use CA callback for X.509 CRT verification")); ret = mbedtls_x509_crt_verify_with_ca_cb( chain, ssl->conf->f_ca_cb, ssl->conf->p_ca_cb, ssl->conf->cert_profile, ssl->hostname, &ssl->session_negotiate->verify_result, f_vrfy, p_vrfy); } else #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ { mbedtls_x509_crt *ca_chain; mbedtls_x509_crl *ca_crl; #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) if (ssl->handshake->sni_ca_chain != NULL) { ca_chain = ssl->handshake->sni_ca_chain; ca_crl = ssl->handshake->sni_ca_crl; } else #endif { ca_chain = ssl->conf->ca_chain; ca_crl = ssl->conf->ca_crl; } if (ca_chain != NULL) { have_ca_chain = 1; } ret = mbedtls_x509_crt_verify_restartable( chain, ca_chain, ca_crl, ssl->conf->cert_profile, ssl->hostname, &ssl->session_negotiate->verify_result, f_vrfy, p_vrfy, rs_ctx); } if (ret != 0) { MBEDTLS_SSL_DEBUG_RET(1, "x509_verify_cert", ret); } #if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED) if (ret == MBEDTLS_ERR_ECP_IN_PROGRESS) { return MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS; } #endif /* * Secondary checks: always done, but change 'ret' only if it was 0 */ #if defined(MBEDTLS_ECP_C) { const mbedtls_pk_context *pk = &chain->pk; /* If certificate uses an EC key, make sure the curve is OK. * This is a public key, so it can't be opaque, so can_do() is a good * enough check to ensure pk_ec() is safe to use here. */ if (mbedtls_pk_can_do(pk, MBEDTLS_PK_ECKEY) && mbedtls_ssl_check_curve(ssl, mbedtls_pk_ec(*pk)->grp.id) != 0) { ssl->session_negotiate->verify_result |= MBEDTLS_X509_BADCERT_BAD_KEY; MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate (EC key curve)")); if (ret == 0) { ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE; } } } #endif /* MBEDTLS_ECP_C */ if (mbedtls_ssl_check_cert_usage(chain, ciphersuite_info, !ssl->conf->endpoint, &ssl->session_negotiate->verify_result) != 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate (usage extensions)")); if (ret == 0) { ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE; } } /* mbedtls_x509_crt_verify_with_profile is supposed to report a * verification failure through MBEDTLS_ERR_X509_CERT_VERIFY_FAILED, * with details encoded in the verification flags. All other kinds * of error codes, including those from the user provided f_vrfy * functions, are treated as fatal and lead to a failure of * ssl_parse_certificate even if verification was optional. */ if (authmode == MBEDTLS_SSL_VERIFY_OPTIONAL && (ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED || ret == MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE)) { ret = 0; } if (have_ca_chain == 0 && authmode == MBEDTLS_SSL_VERIFY_REQUIRED) { MBEDTLS_SSL_DEBUG_MSG(1, ("got no CA chain")); ret = MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED; } if (ret != 0) { uint8_t alert; /* The certificate may have been rejected for several reasons. Pick one and send the corresponding alert. Which alert to send may be a subject of debate in some cases. */ if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_OTHER) { alert = MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED; } else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_CN_MISMATCH) { alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT; } else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_KEY_USAGE) { alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; } else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXT_KEY_USAGE) { alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; } else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NS_CERT_TYPE) { alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; } else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_PK) { alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; } else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_KEY) { alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; } else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXPIRED) { alert = MBEDTLS_SSL_ALERT_MSG_CERT_EXPIRED; } else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_REVOKED) { alert = MBEDTLS_SSL_ALERT_MSG_CERT_REVOKED; } else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NOT_TRUSTED) { alert = MBEDTLS_SSL_ALERT_MSG_UNKNOWN_CA; } else { alert = MBEDTLS_SSL_ALERT_MSG_CERT_UNKNOWN; } mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, alert); } #if defined(MBEDTLS_DEBUG_C) if (ssl->session_negotiate->verify_result != 0) { MBEDTLS_SSL_DEBUG_MSG(3, ("! Certificate verification flags %08x", (unsigned int) ssl->session_negotiate->verify_result)); } else { MBEDTLS_SSL_DEBUG_MSG(3, ("Certificate verification flags clear")); } #endif /* MBEDTLS_DEBUG_C */ return ret; } #if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_remember_peer_crt_digest(mbedtls_ssl_context *ssl, unsigned char *start, size_t len) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; /* Remember digest of the peer's end-CRT. */ ssl->session_negotiate->peer_cert_digest = mbedtls_calloc(1, MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN); if (ssl->session_negotiate->peer_cert_digest == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("alloc(%d bytes) failed", MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN)); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR); return MBEDTLS_ERR_SSL_ALLOC_FAILED; } ret = mbedtls_md(mbedtls_md_info_from_type( MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE), start, len, ssl->session_negotiate->peer_cert_digest); ssl->session_negotiate->peer_cert_digest_type = MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE; ssl->session_negotiate->peer_cert_digest_len = MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN; return ret; } MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_remember_peer_pubkey(mbedtls_ssl_context *ssl, unsigned char *start, size_t len) { unsigned char *end = start + len; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; /* Make a copy of the peer's raw public key. */ mbedtls_pk_init(&ssl->handshake->peer_pubkey); ret = mbedtls_pk_parse_subpubkey(&start, end, &ssl->handshake->peer_pubkey); if (ret != 0) { /* We should have parsed the public key before. */ return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } return 0; } #endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ int mbedtls_ssl_parse_certificate(mbedtls_ssl_context *ssl) { int ret = 0; int crt_expected; #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) const int authmode = ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET ? ssl->handshake->sni_authmode : ssl->conf->authmode; #else const int authmode = ssl->conf->authmode; #endif void *rs_ctx = NULL; mbedtls_x509_crt *chain = NULL; MBEDTLS_SSL_DEBUG_MSG(2, ("=> parse certificate")); crt_expected = ssl_parse_certificate_coordinate(ssl, authmode); if (crt_expected == SSL_CERTIFICATE_SKIP) { MBEDTLS_SSL_DEBUG_MSG(2, ("<= skip parse certificate")); goto exit; } #if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED) if (ssl->handshake->ecrs_enabled && ssl->handshake->ecrs_state == ssl_ecrs_crt_verify) { chain = ssl->handshake->ecrs_peer_cert; ssl->handshake->ecrs_peer_cert = NULL; goto crt_verify; } #endif if ((ret = mbedtls_ssl_read_record(ssl, 1)) != 0) { /* mbedtls_ssl_read_record may have sent an alert already. We let it decide whether to alert. */ MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_read_record", ret); goto exit; } #if defined(MBEDTLS_SSL_SRV_C) if (ssl_srv_check_client_no_crt_notification(ssl) == 0) { ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING; if (authmode != MBEDTLS_SSL_VERIFY_OPTIONAL) { ret = MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE; } goto exit; } #endif /* MBEDTLS_SSL_SRV_C */ /* Clear existing peer CRT structure in case we tried to * reuse a session but it failed, and allocate a new one. */ ssl_clear_peer_cert(ssl->session_negotiate); chain = mbedtls_calloc(1, sizeof(mbedtls_x509_crt)); if (chain == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("alloc(%" MBEDTLS_PRINTF_SIZET " bytes) failed", sizeof(mbedtls_x509_crt))); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR); ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; goto exit; } mbedtls_x509_crt_init(chain); ret = ssl_parse_certificate_chain(ssl, chain); if (ret != 0) { goto exit; } #if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED) if (ssl->handshake->ecrs_enabled) { ssl->handshake->ecrs_state = ssl_ecrs_crt_verify; } crt_verify: if (ssl->handshake->ecrs_enabled) { rs_ctx = &ssl->handshake->ecrs_ctx; } #endif ret = ssl_parse_certificate_verify(ssl, authmode, chain, rs_ctx); if (ret != 0) { goto exit; } #if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) { unsigned char *crt_start, *pk_start; size_t crt_len, pk_len; /* We parse the CRT chain without copying, so * these pointers point into the input buffer, * and are hence still valid after freeing the * CRT chain. */ crt_start = chain->raw.p; crt_len = chain->raw.len; pk_start = chain->pk_raw.p; pk_len = chain->pk_raw.len; /* Free the CRT structures before computing * digest and copying the peer's public key. */ mbedtls_x509_crt_free(chain); mbedtls_free(chain); chain = NULL; ret = ssl_remember_peer_crt_digest(ssl, crt_start, crt_len); if (ret != 0) { goto exit; } ret = ssl_remember_peer_pubkey(ssl, pk_start, pk_len); if (ret != 0) { goto exit; } } #else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ /* Pass ownership to session structure. */ ssl->session_negotiate->peer_cert = chain; chain = NULL; #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ MBEDTLS_SSL_DEBUG_MSG(2, ("<= parse certificate")); exit: if (ret == 0) { ssl->state++; } #if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED) if (ret == MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS) { ssl->handshake->ecrs_peer_cert = chain; chain = NULL; } #endif if (chain != NULL) { mbedtls_x509_crt_free(chain); mbedtls_free(chain); } return ret; } #endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ void mbedtls_ssl_optimize_checksum(mbedtls_ssl_context *ssl, const mbedtls_ssl_ciphersuite_t *ciphersuite_info) { ((void) ciphersuite_info); #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ defined(MBEDTLS_SSL_PROTO_TLS1_1) if (ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3) { ssl->handshake->update_checksum = ssl_update_checksum_md5sha1; } else #endif #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384) if (ciphersuite_info->mac == MBEDTLS_MD_SHA384) { ssl->handshake->update_checksum = ssl_update_checksum_sha384; } else #endif #if defined(MBEDTLS_SHA256_C) if (ciphersuite_info->mac != MBEDTLS_MD_SHA384) { ssl->handshake->update_checksum = ssl_update_checksum_sha256; } else #endif #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ { MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen")); return; } } void mbedtls_ssl_reset_checksum(mbedtls_ssl_context *ssl) { #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ defined(MBEDTLS_SSL_PROTO_TLS1_1) mbedtls_md5_starts_ret(&ssl->handshake->fin_md5); mbedtls_sha1_starts_ret(&ssl->handshake->fin_sha1); #endif #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA256_C) #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_abort(&ssl->handshake->fin_sha256_psa); psa_hash_setup(&ssl->handshake->fin_sha256_psa, PSA_ALG_SHA_256); #else mbedtls_sha256_starts_ret(&ssl->handshake->fin_sha256, 0); #endif #endif #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384) #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_abort(&ssl->handshake->fin_sha384_psa); psa_hash_setup(&ssl->handshake->fin_sha384_psa, PSA_ALG_SHA_384); #else mbedtls_sha512_starts_ret(&ssl->handshake->fin_sha512, 1); #endif #endif #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ } static void ssl_update_checksum_start(mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len) { #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ defined(MBEDTLS_SSL_PROTO_TLS1_1) mbedtls_md5_update_ret(&ssl->handshake->fin_md5, buf, len); mbedtls_sha1_update_ret(&ssl->handshake->fin_sha1, buf, len); #endif #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA256_C) #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_update(&ssl->handshake->fin_sha256_psa, buf, len); #else mbedtls_sha256_update_ret(&ssl->handshake->fin_sha256, buf, len); #endif #endif #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384) #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_update(&ssl->handshake->fin_sha384_psa, buf, len); #else mbedtls_sha512_update_ret(&ssl->handshake->fin_sha512, buf, len); #endif #endif #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ } #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ defined(MBEDTLS_SSL_PROTO_TLS1_1) static void ssl_update_checksum_md5sha1(mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len) { mbedtls_md5_update_ret(&ssl->handshake->fin_md5, buf, len); mbedtls_sha1_update_ret(&ssl->handshake->fin_sha1, buf, len); } #endif #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA256_C) static void ssl_update_checksum_sha256(mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len) { #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_update(&ssl->handshake->fin_sha256_psa, buf, len); #else mbedtls_sha256_update_ret(&ssl->handshake->fin_sha256, buf, len); #endif } #endif #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384) static void ssl_update_checksum_sha384(mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len) { #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_update(&ssl->handshake->fin_sha384_psa, buf, len); #else mbedtls_sha512_update_ret(&ssl->handshake->fin_sha512, buf, len); #endif } #endif #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ #if defined(MBEDTLS_SSL_PROTO_SSL3) static void ssl_calc_finished_ssl( mbedtls_ssl_context *ssl, unsigned char *buf, int from) { const char *sender; mbedtls_md5_context md5; mbedtls_sha1_context sha1; unsigned char padbuf[48]; unsigned char md5sum[16]; unsigned char sha1sum[20]; mbedtls_ssl_session *session = ssl->session_negotiate; if (!session) { session = ssl->session; } MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc finished ssl")); mbedtls_md5_init(&md5); mbedtls_sha1_init(&sha1); mbedtls_md5_clone(&md5, &ssl->handshake->fin_md5); mbedtls_sha1_clone(&sha1, &ssl->handshake->fin_sha1); /* * SSLv3: * hash = * MD5( master + pad2 + * MD5( handshake + sender + master + pad1 ) ) * + SHA1( master + pad2 + * SHA1( handshake + sender + master + pad1 ) ) */ #if !defined(MBEDTLS_MD5_ALT) MBEDTLS_SSL_DEBUG_BUF(4, "finished md5 state", (unsigned char *) md5.state, sizeof(md5.state)); #endif #if !defined(MBEDTLS_SHA1_ALT) MBEDTLS_SSL_DEBUG_BUF(4, "finished sha1 state", (unsigned char *) sha1.state, sizeof(sha1.state)); #endif sender = (from == MBEDTLS_SSL_IS_CLIENT) ? "CLNT" : "SRVR"; memset(padbuf, 0x36, 48); mbedtls_md5_update_ret(&md5, (const unsigned char *) sender, 4); mbedtls_md5_update_ret(&md5, session->master, 48); mbedtls_md5_update_ret(&md5, padbuf, 48); mbedtls_md5_finish_ret(&md5, md5sum); mbedtls_sha1_update_ret(&sha1, (const unsigned char *) sender, 4); mbedtls_sha1_update_ret(&sha1, session->master, 48); mbedtls_sha1_update_ret(&sha1, padbuf, 40); mbedtls_sha1_finish_ret(&sha1, sha1sum); memset(padbuf, 0x5C, 48); mbedtls_md5_starts_ret(&md5); mbedtls_md5_update_ret(&md5, session->master, 48); mbedtls_md5_update_ret(&md5, padbuf, 48); mbedtls_md5_update_ret(&md5, md5sum, 16); mbedtls_md5_finish_ret(&md5, buf); mbedtls_sha1_starts_ret(&sha1); mbedtls_sha1_update_ret(&sha1, session->master, 48); mbedtls_sha1_update_ret(&sha1, padbuf, 40); mbedtls_sha1_update_ret(&sha1, sha1sum, 20); mbedtls_sha1_finish_ret(&sha1, buf + 16); MBEDTLS_SSL_DEBUG_BUF(3, "calc finished result", buf, 36); mbedtls_md5_free(&md5); mbedtls_sha1_free(&sha1); mbedtls_platform_zeroize(padbuf, sizeof(padbuf)); mbedtls_platform_zeroize(md5sum, sizeof(md5sum)); mbedtls_platform_zeroize(sha1sum, sizeof(sha1sum)); MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc finished")); } #endif /* MBEDTLS_SSL_PROTO_SSL3 */ #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) static void ssl_calc_finished_tls( mbedtls_ssl_context *ssl, unsigned char *buf, int from) { int len = 12; const char *sender; mbedtls_md5_context md5; mbedtls_sha1_context sha1; unsigned char padbuf[36]; mbedtls_ssl_session *session = ssl->session_negotiate; if (!session) { session = ssl->session; } MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc finished tls")); mbedtls_md5_init(&md5); mbedtls_sha1_init(&sha1); mbedtls_md5_clone(&md5, &ssl->handshake->fin_md5); mbedtls_sha1_clone(&sha1, &ssl->handshake->fin_sha1); /* * TLSv1: * hash = PRF( master, finished_label, * MD5( handshake ) + SHA1( handshake ) )[0..11] */ #if !defined(MBEDTLS_MD5_ALT) MBEDTLS_SSL_DEBUG_BUF(4, "finished md5 state", (unsigned char *) md5.state, sizeof(md5.state)); #endif #if !defined(MBEDTLS_SHA1_ALT) MBEDTLS_SSL_DEBUG_BUF(4, "finished sha1 state", (unsigned char *) sha1.state, sizeof(sha1.state)); #endif sender = (from == MBEDTLS_SSL_IS_CLIENT) ? "client finished" : "server finished"; mbedtls_md5_finish_ret(&md5, padbuf); mbedtls_sha1_finish_ret(&sha1, padbuf + 16); ssl->handshake->tls_prf(session->master, 48, sender, padbuf, 36, buf, len); MBEDTLS_SSL_DEBUG_BUF(3, "calc finished result", buf, len); mbedtls_md5_free(&md5); mbedtls_sha1_free(&sha1); mbedtls_platform_zeroize(padbuf, sizeof(padbuf)); MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc finished")); } #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA256_C) static void ssl_calc_finished_tls_sha256( mbedtls_ssl_context *ssl, unsigned char *buf, int from) { int len = 12; const char *sender; unsigned char padbuf[32]; #if defined(MBEDTLS_USE_PSA_CRYPTO) size_t hash_size; psa_hash_operation_t sha256_psa = PSA_HASH_OPERATION_INIT; psa_status_t status; #else mbedtls_sha256_context sha256; #endif mbedtls_ssl_session *session = ssl->session_negotiate; if (!session) { session = ssl->session; } sender = (from == MBEDTLS_SSL_IS_CLIENT) ? "client finished" : "server finished"; #if defined(MBEDTLS_USE_PSA_CRYPTO) sha256_psa = psa_hash_operation_init(); MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc PSA finished tls sha256")); status = psa_hash_clone(&ssl->handshake->fin_sha256_psa, &sha256_psa); if (status != PSA_SUCCESS) { MBEDTLS_SSL_DEBUG_MSG(2, ("PSA hash clone failed")); return; } status = psa_hash_finish(&sha256_psa, padbuf, sizeof(padbuf), &hash_size); if (status != PSA_SUCCESS) { MBEDTLS_SSL_DEBUG_MSG(2, ("PSA hash finish failed")); return; } MBEDTLS_SSL_DEBUG_BUF(3, "PSA calculated padbuf", padbuf, 32); #else mbedtls_sha256_init(&sha256); MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc finished tls sha256")); mbedtls_sha256_clone(&sha256, &ssl->handshake->fin_sha256); /* * TLSv1.2: * hash = PRF( master, finished_label, * Hash( handshake ) )[0.11] */ #if !defined(MBEDTLS_SHA256_ALT) MBEDTLS_SSL_DEBUG_BUF(4, "finished sha2 state", (unsigned char *) sha256.state, sizeof(sha256.state)); #endif mbedtls_sha256_finish_ret(&sha256, padbuf); mbedtls_sha256_free(&sha256); #endif /* MBEDTLS_USE_PSA_CRYPTO */ ssl->handshake->tls_prf(session->master, 48, sender, padbuf, 32, buf, len); MBEDTLS_SSL_DEBUG_BUF(3, "calc finished result", buf, len); mbedtls_platform_zeroize(padbuf, sizeof(padbuf)); MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc finished")); } #endif /* MBEDTLS_SHA256_C */ #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384) static void ssl_calc_finished_tls_sha384( mbedtls_ssl_context *ssl, unsigned char *buf, int from) { int len = 12; const char *sender; unsigned char padbuf[48]; #if defined(MBEDTLS_USE_PSA_CRYPTO) size_t hash_size; psa_hash_operation_t sha384_psa = PSA_HASH_OPERATION_INIT; psa_status_t status; #else mbedtls_sha512_context sha512; #endif mbedtls_ssl_session *session = ssl->session_negotiate; if (!session) { session = ssl->session; } sender = (from == MBEDTLS_SSL_IS_CLIENT) ? "client finished" : "server finished"; #if defined(MBEDTLS_USE_PSA_CRYPTO) sha384_psa = psa_hash_operation_init(); MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc PSA finished tls sha384")); status = psa_hash_clone(&ssl->handshake->fin_sha384_psa, &sha384_psa); if (status != PSA_SUCCESS) { MBEDTLS_SSL_DEBUG_MSG(2, ("PSA hash clone failed")); return; } status = psa_hash_finish(&sha384_psa, padbuf, sizeof(padbuf), &hash_size); if (status != PSA_SUCCESS) { MBEDTLS_SSL_DEBUG_MSG(2, ("PSA hash finish failed")); return; } MBEDTLS_SSL_DEBUG_BUF(3, "PSA calculated padbuf", padbuf, 48); #else mbedtls_sha512_init(&sha512); MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc finished tls sha384")); mbedtls_sha512_clone(&sha512, &ssl->handshake->fin_sha512); /* * TLSv1.2: * hash = PRF( master, finished_label, * Hash( handshake ) )[0.11] */ #if !defined(MBEDTLS_SHA512_ALT) MBEDTLS_SSL_DEBUG_BUF(4, "finished sha512 state", (unsigned char *) sha512.state, sizeof(sha512.state)); #endif /* mbedtls_sha512_finish_ret's output parameter is declared as a * 64-byte buffer, but since we're using SHA-384, we know that the * output fits in 48 bytes. This is correct C, but GCC 11.1 warns * about it. */ #if defined(__GNUC__) && __GNUC__ >= 11 #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wstringop-overflow" #endif mbedtls_sha512_finish_ret(&sha512, padbuf); #if defined(__GNUC__) && __GNUC__ >= 11 #pragma GCC diagnostic pop #endif mbedtls_sha512_free(&sha512); #endif ssl->handshake->tls_prf(session->master, 48, sender, padbuf, 48, buf, len); MBEDTLS_SSL_DEBUG_BUF(3, "calc finished result", buf, len); mbedtls_platform_zeroize(padbuf, sizeof(padbuf)); MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc finished")); } #endif /* MBEDTLS_SHA512_C && !MBEDTLS_SHA512_NO_SHA384 */ #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ void mbedtls_ssl_handshake_wrapup_free_hs_transform(mbedtls_ssl_context *ssl) { MBEDTLS_SSL_DEBUG_MSG(3, ("=> handshake wrapup: final free")); /* * Free our handshake params */ mbedtls_ssl_handshake_free(ssl); mbedtls_free(ssl->handshake); ssl->handshake = NULL; /* * Free the previous transform and switch in the current one */ if (ssl->transform) { mbedtls_ssl_transform_free(ssl->transform); mbedtls_free(ssl->transform); } ssl->transform = ssl->transform_negotiate; ssl->transform_negotiate = NULL; MBEDTLS_SSL_DEBUG_MSG(3, ("<= handshake wrapup: final free")); } void mbedtls_ssl_handshake_wrapup(mbedtls_ssl_context *ssl) { int resume = ssl->handshake->resume; MBEDTLS_SSL_DEBUG_MSG(3, ("=> handshake wrapup")); #if defined(MBEDTLS_SSL_RENEGOTIATION) if (ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS) { ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_DONE; ssl->renego_records_seen = 0; } #endif /* * Free the previous session and switch in the current one */ if (ssl->session) { #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) /* RFC 7366 3.1: keep the EtM state */ ssl->session_negotiate->encrypt_then_mac = ssl->session->encrypt_then_mac; #endif mbedtls_ssl_session_free(ssl->session); mbedtls_free(ssl->session); } ssl->session = ssl->session_negotiate; ssl->session_negotiate = NULL; /* * Add cache entry */ if (ssl->conf->f_set_cache != NULL && ssl->session->id_len != 0 && resume == 0) { if (ssl->conf->f_set_cache(ssl->conf->p_cache, ssl->session) != 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("cache did not store session")); } } #if defined(MBEDTLS_SSL_PROTO_DTLS) if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && ssl->handshake->flight != NULL) { /* Cancel handshake timer */ mbedtls_ssl_set_timer(ssl, 0); /* Keep last flight around in case we need to resend it: * we need the handshake and transform structures for that */ MBEDTLS_SSL_DEBUG_MSG(3, ("skip freeing handshake and transform")); } else #endif mbedtls_ssl_handshake_wrapup_free_hs_transform(ssl); ssl->state++; MBEDTLS_SSL_DEBUG_MSG(3, ("<= handshake wrapup")); } int mbedtls_ssl_write_finished(mbedtls_ssl_context *ssl) { int ret, hash_len; MBEDTLS_SSL_DEBUG_MSG(2, ("=> write finished")); mbedtls_ssl_update_out_pointers(ssl, ssl->transform_negotiate); ssl->handshake->calc_finished(ssl, ssl->out_msg + 4, ssl->conf->endpoint); /* * RFC 5246 7.4.9 (Page 63) says 12 is the default length and ciphersuites * may define some other value. Currently (early 2016), no defined * ciphersuite does this (and this is unlikely to change as activity has * moved to TLS 1.3 now) so we can keep the hardcoded 12 here. */ hash_len = (ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0) ? 36 : 12; #if defined(MBEDTLS_SSL_RENEGOTIATION) ssl->verify_data_len = hash_len; memcpy(ssl->own_verify_data, ssl->out_msg + 4, hash_len); #endif ssl->out_msglen = 4 + hash_len; ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; ssl->out_msg[0] = MBEDTLS_SSL_HS_FINISHED; /* * In case of session resuming, invert the client and server * ChangeCipherSpec messages order. */ if (ssl->handshake->resume != 0) { #if defined(MBEDTLS_SSL_CLI_C) if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) { ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP; } #endif #if defined(MBEDTLS_SSL_SRV_C) if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) { ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC; } #endif } else { ssl->state++; } /* * Switch to our negotiated transform and session parameters for outbound * data. */ MBEDTLS_SSL_DEBUG_MSG(3, ("switching to new transform spec for outbound data")); #if defined(MBEDTLS_SSL_PROTO_DTLS) if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) { unsigned char i; /* Remember current epoch settings for resending */ ssl->handshake->alt_transform_out = ssl->transform_out; memcpy(ssl->handshake->alt_out_ctr, ssl->cur_out_ctr, 8); /* Set sequence_number to zero */ memset(ssl->cur_out_ctr + 2, 0, 6); /* Increment epoch */ for (i = 2; i > 0; i--) { if (++ssl->cur_out_ctr[i - 1] != 0) { break; } } /* The loop goes to its end iff the counter is wrapping */ if (i == 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("DTLS epoch would wrap")); return MBEDTLS_ERR_SSL_COUNTER_WRAPPING; } } else #endif /* MBEDTLS_SSL_PROTO_DTLS */ memset(ssl->cur_out_ctr, 0, 8); ssl->transform_out = ssl->transform_negotiate; ssl->session_out = ssl->session_negotiate; #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) if (mbedtls_ssl_hw_record_activate != NULL) { if ((ret = mbedtls_ssl_hw_record_activate(ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_hw_record_activate", ret); return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } } #endif #if defined(MBEDTLS_SSL_PROTO_DTLS) if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) { mbedtls_ssl_send_flight_completed(ssl); } #endif if ((ret = mbedtls_ssl_write_handshake_msg(ssl)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_write_handshake_msg", ret); return ret; } #if defined(MBEDTLS_SSL_PROTO_DTLS) if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && (ret = mbedtls_ssl_flight_transmit(ssl)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_flight_transmit", ret); return ret; } #endif MBEDTLS_SSL_DEBUG_MSG(2, ("<= write finished")); return 0; } #if defined(MBEDTLS_SSL_PROTO_SSL3) #define SSL_MAX_HASH_LEN 36 #else #define SSL_MAX_HASH_LEN 12 #endif int mbedtls_ssl_parse_finished(mbedtls_ssl_context *ssl) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; unsigned int hash_len; unsigned char buf[SSL_MAX_HASH_LEN]; MBEDTLS_SSL_DEBUG_MSG(2, ("=> parse finished")); /* There is currently no ciphersuite using another length with TLS 1.2 */ #if defined(MBEDTLS_SSL_PROTO_SSL3) if (ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0) { hash_len = 36; } else #endif hash_len = 12; ssl->handshake->calc_finished(ssl, buf, ssl->conf->endpoint ^ 1); if ((ret = mbedtls_ssl_read_record(ssl, 1)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_read_record", ret); goto exit; } if (ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad finished message")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE); ret = MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE; goto exit; } if (ssl->in_msg[0] != MBEDTLS_SSL_HS_FINISHED || ssl->in_hslen != mbedtls_ssl_hs_hdr_len(ssl) + hash_len) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad finished message")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR); ret = MBEDTLS_ERR_SSL_BAD_HS_FINISHED; goto exit; } if (mbedtls_ct_memcmp(ssl->in_msg + mbedtls_ssl_hs_hdr_len(ssl), buf, hash_len) != 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad finished message")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR); ret = MBEDTLS_ERR_SSL_BAD_HS_FINISHED; goto exit; } #if defined(MBEDTLS_SSL_RENEGOTIATION) ssl->verify_data_len = hash_len; memcpy(ssl->peer_verify_data, buf, hash_len); #endif if (ssl->handshake->resume != 0) { #if defined(MBEDTLS_SSL_CLI_C) if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) { ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC; } #endif #if defined(MBEDTLS_SSL_SRV_C) if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) { ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP; } #endif } else { ssl->state++; } #if defined(MBEDTLS_SSL_PROTO_DTLS) if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) { mbedtls_ssl_recv_flight_completed(ssl); } #endif MBEDTLS_SSL_DEBUG_MSG(2, ("<= parse finished")); exit: mbedtls_platform_zeroize(buf, hash_len); return ret; } static void ssl_handshake_params_init(mbedtls_ssl_handshake_params *handshake) { memset(handshake, 0, sizeof(mbedtls_ssl_handshake_params)); #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ defined(MBEDTLS_SSL_PROTO_TLS1_1) mbedtls_md5_init(&handshake->fin_md5); mbedtls_sha1_init(&handshake->fin_sha1); mbedtls_md5_starts_ret(&handshake->fin_md5); mbedtls_sha1_starts_ret(&handshake->fin_sha1); #endif #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA256_C) #if defined(MBEDTLS_USE_PSA_CRYPTO) handshake->fin_sha256_psa = psa_hash_operation_init(); psa_hash_setup(&handshake->fin_sha256_psa, PSA_ALG_SHA_256); #else mbedtls_sha256_init(&handshake->fin_sha256); mbedtls_sha256_starts_ret(&handshake->fin_sha256, 0); #endif #endif #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384) #if defined(MBEDTLS_USE_PSA_CRYPTO) handshake->fin_sha384_psa = psa_hash_operation_init(); psa_hash_setup(&handshake->fin_sha384_psa, PSA_ALG_SHA_384); #else mbedtls_sha512_init(&handshake->fin_sha512); mbedtls_sha512_starts_ret(&handshake->fin_sha512, 1); #endif #endif #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ handshake->update_checksum = ssl_update_checksum_start; #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) mbedtls_ssl_sig_hash_set_init(&handshake->hash_algs); #endif #if defined(MBEDTLS_DHM_C) mbedtls_dhm_init(&handshake->dhm_ctx); #endif #if defined(MBEDTLS_ECDH_C) mbedtls_ecdh_init(&handshake->ecdh_ctx); #endif #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) mbedtls_ecjpake_init(&handshake->ecjpake_ctx); #if defined(MBEDTLS_SSL_CLI_C) handshake->ecjpake_cache = NULL; handshake->ecjpake_cache_len = 0; #endif #endif #if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED) mbedtls_x509_crt_restart_init(&handshake->ecrs_ctx); #endif #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) handshake->sni_authmode = MBEDTLS_SSL_VERIFY_UNSET; #endif #if defined(MBEDTLS_X509_CRT_PARSE_C) && \ !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) mbedtls_pk_init(&handshake->peer_pubkey); #endif } void mbedtls_ssl_transform_init(mbedtls_ssl_transform *transform) { memset(transform, 0, sizeof(mbedtls_ssl_transform)); mbedtls_cipher_init(&transform->cipher_ctx_enc); mbedtls_cipher_init(&transform->cipher_ctx_dec); #if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) mbedtls_md_init(&transform->md_ctx_enc); mbedtls_md_init(&transform->md_ctx_dec); #endif } void mbedtls_ssl_session_init(mbedtls_ssl_session *session) { memset(session, 0, sizeof(mbedtls_ssl_session)); } MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_handshake_init(mbedtls_ssl_context *ssl) { /* Clear old handshake information if present */ if (ssl->transform_negotiate) { mbedtls_ssl_transform_free(ssl->transform_negotiate); } if (ssl->session_negotiate) { mbedtls_ssl_session_free(ssl->session_negotiate); } if (ssl->handshake) { mbedtls_ssl_handshake_free(ssl); } /* * Either the pointers are now NULL or cleared properly and can be freed. * Now allocate missing structures. */ if (ssl->transform_negotiate == NULL) { ssl->transform_negotiate = mbedtls_calloc(1, sizeof(mbedtls_ssl_transform)); } if (ssl->session_negotiate == NULL) { ssl->session_negotiate = mbedtls_calloc(1, sizeof(mbedtls_ssl_session)); } if (ssl->handshake == NULL) { ssl->handshake = mbedtls_calloc(1, sizeof(mbedtls_ssl_handshake_params)); } #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) /* If the buffers are too small - reallocate */ handle_buffer_resizing(ssl, 0, MBEDTLS_SSL_IN_BUFFER_LEN, MBEDTLS_SSL_OUT_BUFFER_LEN); #endif /* All pointers should exist and can be directly freed without issue */ if (ssl->handshake == NULL || ssl->transform_negotiate == NULL || ssl->session_negotiate == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("alloc() of ssl sub-contexts failed")); mbedtls_free(ssl->handshake); mbedtls_free(ssl->transform_negotiate); mbedtls_free(ssl->session_negotiate); ssl->handshake = NULL; ssl->transform_negotiate = NULL; ssl->session_negotiate = NULL; return MBEDTLS_ERR_SSL_ALLOC_FAILED; } /* Initialize structures */ mbedtls_ssl_session_init(ssl->session_negotiate); mbedtls_ssl_transform_init(ssl->transform_negotiate); ssl_handshake_params_init(ssl->handshake); #if defined(MBEDTLS_SSL_PROTO_DTLS) if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) { ssl->handshake->alt_transform_out = ssl->transform_out; if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) { ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING; } else { ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING; } mbedtls_ssl_set_timer(ssl, 0); } #endif return 0; } #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) /* Dummy cookie callbacks for defaults */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_cookie_write_dummy(void *ctx, unsigned char **p, unsigned char *end, const unsigned char *cli_id, size_t cli_id_len) { ((void) ctx); ((void) p); ((void) end); ((void) cli_id); ((void) cli_id_len); return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_cookie_check_dummy(void *ctx, const unsigned char *cookie, size_t cookie_len, const unsigned char *cli_id, size_t cli_id_len) { ((void) ctx); ((void) cookie); ((void) cookie_len); ((void) cli_id); ((void) cli_id_len); return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } #endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY && MBEDTLS_SSL_SRV_C */ /* * Initialize an SSL context */ void mbedtls_ssl_init(mbedtls_ssl_context *ssl) { memset(ssl, 0, sizeof(mbedtls_ssl_context)); } /* * Setup an SSL context */ int mbedtls_ssl_setup(mbedtls_ssl_context *ssl, const mbedtls_ssl_config *conf) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; size_t in_buf_len = MBEDTLS_SSL_IN_BUFFER_LEN; size_t out_buf_len = MBEDTLS_SSL_OUT_BUFFER_LEN; ssl->conf = conf; /* * Prepare base structures */ /* Set to NULL in case of an error condition */ ssl->out_buf = NULL; #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) ssl->in_buf_len = in_buf_len; #endif ssl->in_buf = mbedtls_calloc(1, in_buf_len); if (ssl->in_buf == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("alloc(%" MBEDTLS_PRINTF_SIZET " bytes) failed", in_buf_len)); ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; goto error; } #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) ssl->out_buf_len = out_buf_len; #endif ssl->out_buf = mbedtls_calloc(1, out_buf_len); if (ssl->out_buf == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("alloc(%" MBEDTLS_PRINTF_SIZET " bytes) failed", out_buf_len)); ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; goto error; } mbedtls_ssl_reset_in_out_pointers(ssl); #if defined(MBEDTLS_SSL_DTLS_SRTP) memset(&ssl->dtls_srtp_info, 0, sizeof(ssl->dtls_srtp_info)); #endif if ((ret = ssl_handshake_init(ssl)) != 0) { goto error; } return 0; error: mbedtls_free(ssl->in_buf); mbedtls_free(ssl->out_buf); ssl->conf = NULL; #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) ssl->in_buf_len = 0; ssl->out_buf_len = 0; #endif ssl->in_buf = NULL; ssl->out_buf = NULL; ssl->in_hdr = NULL; ssl->in_ctr = NULL; ssl->in_len = NULL; ssl->in_iv = NULL; ssl->in_msg = NULL; ssl->out_hdr = NULL; ssl->out_ctr = NULL; ssl->out_len = NULL; ssl->out_iv = NULL; ssl->out_msg = NULL; return ret; } /* * Reset an initialized and used SSL context for re-use while retaining * all application-set variables, function pointers and data. * * If partial is non-zero, keep data in the input buffer and client ID. * (Use when a DTLS client reconnects from the same port.) */ int mbedtls_ssl_session_reset_int(mbedtls_ssl_context *ssl, int partial) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) size_t in_buf_len = ssl->in_buf_len; size_t out_buf_len = ssl->out_buf_len; #else size_t in_buf_len = MBEDTLS_SSL_IN_BUFFER_LEN; size_t out_buf_len = MBEDTLS_SSL_OUT_BUFFER_LEN; #endif #if !defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) || \ !defined(MBEDTLS_SSL_SRV_C) ((void) partial); #endif ssl->state = MBEDTLS_SSL_HELLO_REQUEST; /* Cancel any possibly running timer */ mbedtls_ssl_set_timer(ssl, 0); #if defined(MBEDTLS_SSL_RENEGOTIATION) ssl->renego_status = MBEDTLS_SSL_INITIAL_HANDSHAKE; ssl->renego_records_seen = 0; ssl->verify_data_len = 0; memset(ssl->own_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN); memset(ssl->peer_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN); #endif ssl->secure_renegotiation = MBEDTLS_SSL_LEGACY_RENEGOTIATION; ssl->in_offt = NULL; mbedtls_ssl_reset_in_out_pointers(ssl); ssl->in_msgtype = 0; ssl->in_msglen = 0; #if defined(MBEDTLS_SSL_PROTO_DTLS) ssl->next_record_offset = 0; ssl->in_epoch = 0; #endif #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) mbedtls_ssl_dtls_replay_reset(ssl); #endif ssl->in_hslen = 0; ssl->nb_zero = 0; ssl->keep_current_message = 0; ssl->out_msgtype = 0; ssl->out_msglen = 0; ssl->out_left = 0; #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) if (ssl->split_done != MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED) { ssl->split_done = 0; } #endif memset(ssl->cur_out_ctr, 0, sizeof(ssl->cur_out_ctr)); ssl->transform_in = NULL; ssl->transform_out = NULL; ssl->session_in = NULL; ssl->session_out = NULL; memset(ssl->out_buf, 0, out_buf_len); int clear_in_buf = 1; #if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C) if (partial != 0) { clear_in_buf = 0; } #endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */ if (clear_in_buf) { ssl->in_left = 0; memset(ssl->in_buf, 0, in_buf_len); } #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) if (mbedtls_ssl_hw_record_reset != NULL) { MBEDTLS_SSL_DEBUG_MSG(2, ("going for mbedtls_ssl_hw_record_reset()")); if ((ret = mbedtls_ssl_hw_record_reset(ssl)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_hw_record_reset", ret); return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } } #endif if (ssl->transform) { mbedtls_ssl_transform_free(ssl->transform); mbedtls_free(ssl->transform); ssl->transform = NULL; } if (ssl->session) { mbedtls_ssl_session_free(ssl->session); mbedtls_free(ssl->session); ssl->session = NULL; } #if defined(MBEDTLS_SSL_ALPN) ssl->alpn_chosen = NULL; #endif #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) int free_cli_id = 1; #if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) if (partial != 0) { free_cli_id = 0; } #endif if (free_cli_id) { mbedtls_free(ssl->cli_id); ssl->cli_id = NULL; ssl->cli_id_len = 0; } #endif if ((ret = ssl_handshake_init(ssl)) != 0) { return ret; } return 0; } /* * Reset an initialized and used SSL context for re-use while retaining * all application-set variables, function pointers and data. */ int mbedtls_ssl_session_reset(mbedtls_ssl_context *ssl) { return mbedtls_ssl_session_reset_int(ssl, 0); } /* * SSL set accessors */ void mbedtls_ssl_conf_endpoint(mbedtls_ssl_config *conf, int endpoint) { conf->endpoint = endpoint; } void mbedtls_ssl_conf_transport(mbedtls_ssl_config *conf, int transport) { conf->transport = transport; } #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) void mbedtls_ssl_conf_dtls_anti_replay(mbedtls_ssl_config *conf, char mode) { conf->anti_replay = mode; } #endif #if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT) void mbedtls_ssl_conf_dtls_badmac_limit(mbedtls_ssl_config *conf, unsigned limit) { conf->badmac_limit = limit; } #endif #if defined(MBEDTLS_SSL_PROTO_DTLS) void mbedtls_ssl_set_datagram_packing(mbedtls_ssl_context *ssl, unsigned allow_packing) { ssl->disable_datagram_packing = !allow_packing; } void mbedtls_ssl_conf_handshake_timeout(mbedtls_ssl_config *conf, uint32_t min, uint32_t max) { conf->hs_timeout_min = min; conf->hs_timeout_max = max; } #endif void mbedtls_ssl_conf_authmode(mbedtls_ssl_config *conf, int authmode) { conf->authmode = authmode; } #if defined(MBEDTLS_X509_CRT_PARSE_C) void mbedtls_ssl_conf_verify(mbedtls_ssl_config *conf, int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), void *p_vrfy) { conf->f_vrfy = f_vrfy; conf->p_vrfy = p_vrfy; } #endif /* MBEDTLS_X509_CRT_PARSE_C */ void mbedtls_ssl_conf_rng(mbedtls_ssl_config *conf, int (*f_rng)(void *, unsigned char *, size_t), void *p_rng) { conf->f_rng = f_rng; conf->p_rng = p_rng; } void mbedtls_ssl_conf_dbg(mbedtls_ssl_config *conf, void (*f_dbg)(void *, int, const char *, int, const char *), void *p_dbg) { conf->f_dbg = f_dbg; conf->p_dbg = p_dbg; } void mbedtls_ssl_set_bio(mbedtls_ssl_context *ssl, void *p_bio, mbedtls_ssl_send_t *f_send, mbedtls_ssl_recv_t *f_recv, mbedtls_ssl_recv_timeout_t *f_recv_timeout) { ssl->p_bio = p_bio; ssl->f_send = f_send; ssl->f_recv = f_recv; ssl->f_recv_timeout = f_recv_timeout; } #if defined(MBEDTLS_SSL_PROTO_DTLS) void mbedtls_ssl_set_mtu(mbedtls_ssl_context *ssl, uint16_t mtu) { ssl->mtu = mtu; } #endif void mbedtls_ssl_conf_read_timeout(mbedtls_ssl_config *conf, uint32_t timeout) { conf->read_timeout = timeout; } void mbedtls_ssl_set_timer_cb(mbedtls_ssl_context *ssl, void *p_timer, mbedtls_ssl_set_timer_t *f_set_timer, mbedtls_ssl_get_timer_t *f_get_timer) { ssl->p_timer = p_timer; ssl->f_set_timer = f_set_timer; ssl->f_get_timer = f_get_timer; /* Make sure we start with no timer running */ mbedtls_ssl_set_timer(ssl, 0); } #if defined(MBEDTLS_SSL_SRV_C) void mbedtls_ssl_conf_session_cache(mbedtls_ssl_config *conf, void *p_cache, int (*f_get_cache)(void *, mbedtls_ssl_session *), int (*f_set_cache)(void *, const mbedtls_ssl_session *)) { conf->p_cache = p_cache; conf->f_get_cache = f_get_cache; conf->f_set_cache = f_set_cache; } #endif /* MBEDTLS_SSL_SRV_C */ #if defined(MBEDTLS_SSL_CLI_C) int mbedtls_ssl_set_session(mbedtls_ssl_context *ssl, const mbedtls_ssl_session *session) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; if (ssl == NULL || session == NULL || ssl->session_negotiate == NULL || ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if ((ret = mbedtls_ssl_session_copy(ssl->session_negotiate, session)) != 0) { return ret; } ssl->handshake->resume = 1; return 0; } #endif /* MBEDTLS_SSL_CLI_C */ void mbedtls_ssl_conf_ciphersuites(mbedtls_ssl_config *conf, const int *ciphersuites) { conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = ciphersuites; conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = ciphersuites; conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = ciphersuites; conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = ciphersuites; } void mbedtls_ssl_conf_ciphersuites_for_version(mbedtls_ssl_config *conf, const int *ciphersuites, int major, int minor) { if (major != MBEDTLS_SSL_MAJOR_VERSION_3) { return; } if (minor < MBEDTLS_SSL_MINOR_VERSION_0 || minor > MBEDTLS_SSL_MINOR_VERSION_3) { return; } conf->ciphersuite_list[minor] = ciphersuites; } #if defined(MBEDTLS_X509_CRT_PARSE_C) void mbedtls_ssl_conf_cert_profile(mbedtls_ssl_config *conf, const mbedtls_x509_crt_profile *profile) { conf->cert_profile = profile; } /* Append a new keycert entry to a (possibly empty) list */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_append_key_cert(mbedtls_ssl_key_cert **head, mbedtls_x509_crt *cert, mbedtls_pk_context *key) { mbedtls_ssl_key_cert *new_cert; new_cert = mbedtls_calloc(1, sizeof(mbedtls_ssl_key_cert)); if (new_cert == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } new_cert->cert = cert; new_cert->key = key; new_cert->next = NULL; /* Update head is the list was null, else add to the end */ if (*head == NULL) { *head = new_cert; } else { mbedtls_ssl_key_cert *cur = *head; while (cur->next != NULL) { cur = cur->next; } cur->next = new_cert; } return 0; } int mbedtls_ssl_conf_own_cert(mbedtls_ssl_config *conf, mbedtls_x509_crt *own_cert, mbedtls_pk_context *pk_key) { return ssl_append_key_cert(&conf->key_cert, own_cert, pk_key); } void mbedtls_ssl_conf_ca_chain(mbedtls_ssl_config *conf, mbedtls_x509_crt *ca_chain, mbedtls_x509_crl *ca_crl) { conf->ca_chain = ca_chain; conf->ca_crl = ca_crl; #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) /* mbedtls_ssl_conf_ca_chain() and mbedtls_ssl_conf_ca_cb() * cannot be used together. */ conf->f_ca_cb = NULL; conf->p_ca_cb = NULL; #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ } #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) void mbedtls_ssl_conf_ca_cb(mbedtls_ssl_config *conf, mbedtls_x509_crt_ca_cb_t f_ca_cb, void *p_ca_cb) { conf->f_ca_cb = f_ca_cb; conf->p_ca_cb = p_ca_cb; /* mbedtls_ssl_conf_ca_chain() and mbedtls_ssl_conf_ca_cb() * cannot be used together. */ conf->ca_chain = NULL; conf->ca_crl = NULL; } #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ #endif /* MBEDTLS_X509_CRT_PARSE_C */ #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) int mbedtls_ssl_set_hs_own_cert(mbedtls_ssl_context *ssl, mbedtls_x509_crt *own_cert, mbedtls_pk_context *pk_key) { return ssl_append_key_cert(&ssl->handshake->sni_key_cert, own_cert, pk_key); } void mbedtls_ssl_set_hs_ca_chain(mbedtls_ssl_context *ssl, mbedtls_x509_crt *ca_chain, mbedtls_x509_crl *ca_crl) { ssl->handshake->sni_ca_chain = ca_chain; ssl->handshake->sni_ca_crl = ca_crl; } void mbedtls_ssl_set_hs_authmode(mbedtls_ssl_context *ssl, int authmode) { ssl->handshake->sni_authmode = authmode; } #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ #if defined(MBEDTLS_X509_CRT_PARSE_C) void mbedtls_ssl_set_verify(mbedtls_ssl_context *ssl, int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), void *p_vrfy) { ssl->f_vrfy = f_vrfy; ssl->p_vrfy = p_vrfy; } #endif #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) /* * Set EC J-PAKE password for current handshake */ int mbedtls_ssl_set_hs_ecjpake_password(mbedtls_ssl_context *ssl, const unsigned char *pw, size_t pw_len) { mbedtls_ecjpake_role role; if (ssl->handshake == NULL || ssl->conf == NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) { role = MBEDTLS_ECJPAKE_SERVER; } else { role = MBEDTLS_ECJPAKE_CLIENT; } return mbedtls_ecjpake_setup(&ssl->handshake->ecjpake_ctx, role, MBEDTLS_MD_SHA256, MBEDTLS_ECP_DP_SECP256R1, pw, pw_len); } #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) static void ssl_conf_remove_psk(mbedtls_ssl_config *conf) { /* Remove reference to existing PSK, if any. */ #if defined(MBEDTLS_USE_PSA_CRYPTO) if (!mbedtls_svc_key_id_is_null(conf->psk_opaque)) { /* The maintenance of the PSK key slot is the * user's responsibility. */ conf->psk_opaque = MBEDTLS_SVC_KEY_ID_INIT; } /* This and the following branch should never * be taken simultaneously as we maintain the * invariant that raw and opaque PSKs are never * configured simultaneously. As a safeguard, * though, `else` is omitted here. */ #endif /* MBEDTLS_USE_PSA_CRYPTO */ if (conf->psk != NULL) { mbedtls_platform_zeroize(conf->psk, conf->psk_len); mbedtls_free(conf->psk); conf->psk = NULL; conf->psk_len = 0; } /* Remove reference to PSK identity, if any. */ if (conf->psk_identity != NULL) { mbedtls_free(conf->psk_identity); conf->psk_identity = NULL; conf->psk_identity_len = 0; } } /* This function assumes that PSK identity in the SSL config is unset. * It checks that the provided identity is well-formed and attempts * to make a copy of it in the SSL config. * On failure, the PSK identity in the config remains unset. */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_conf_set_psk_identity(mbedtls_ssl_config *conf, unsigned char const *psk_identity, size_t psk_identity_len) { /* Identity len will be encoded on two bytes */ if (psk_identity == NULL || (psk_identity_len >> 16) != 0 || psk_identity_len > MBEDTLS_SSL_OUT_CONTENT_LEN) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } conf->psk_identity = mbedtls_calloc(1, psk_identity_len); if (conf->psk_identity == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } conf->psk_identity_len = psk_identity_len; memcpy(conf->psk_identity, psk_identity, conf->psk_identity_len); return 0; } int mbedtls_ssl_conf_psk(mbedtls_ssl_config *conf, const unsigned char *psk, size_t psk_len, const unsigned char *psk_identity, size_t psk_identity_len) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; /* Remove opaque/raw PSK + PSK Identity */ ssl_conf_remove_psk(conf); /* Check and set raw PSK */ if (psk == NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (psk_len == 0) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (psk_len > MBEDTLS_PSK_MAX_LEN) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if ((conf->psk = mbedtls_calloc(1, psk_len)) == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } conf->psk_len = psk_len; memcpy(conf->psk, psk, conf->psk_len); /* Check and set PSK Identity */ ret = ssl_conf_set_psk_identity(conf, psk_identity, psk_identity_len); if (ret != 0) { ssl_conf_remove_psk(conf); } return ret; } static void ssl_remove_psk(mbedtls_ssl_context *ssl) { #if defined(MBEDTLS_USE_PSA_CRYPTO) if (!mbedtls_svc_key_id_is_null(ssl->handshake->psk_opaque)) { ssl->handshake->psk_opaque = MBEDTLS_SVC_KEY_ID_INIT; } else #endif /* MBEDTLS_USE_PSA_CRYPTO */ if (ssl->handshake->psk != NULL) { mbedtls_platform_zeroize(ssl->handshake->psk, ssl->handshake->psk_len); mbedtls_free(ssl->handshake->psk); ssl->handshake->psk_len = 0; } } int mbedtls_ssl_set_hs_psk(mbedtls_ssl_context *ssl, const unsigned char *psk, size_t psk_len) { if (psk == NULL || ssl->handshake == NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (psk_len > MBEDTLS_PSK_MAX_LEN) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ssl_remove_psk(ssl); if ((ssl->handshake->psk = mbedtls_calloc(1, psk_len)) == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } ssl->handshake->psk_len = psk_len; memcpy(ssl->handshake->psk, psk, ssl->handshake->psk_len); return 0; } #if defined(MBEDTLS_USE_PSA_CRYPTO) int mbedtls_ssl_conf_psk_opaque(mbedtls_ssl_config *conf, psa_key_id_t psk, const unsigned char *psk_identity, size_t psk_identity_len) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; /* Clear opaque/raw PSK + PSK Identity, if present. */ ssl_conf_remove_psk(conf); /* Check and set opaque PSK */ if (mbedtls_svc_key_id_is_null(psk)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } conf->psk_opaque = psk; /* Check and set PSK Identity */ ret = ssl_conf_set_psk_identity(conf, psk_identity, psk_identity_len); if (ret != 0) { ssl_conf_remove_psk(conf); } return ret; } int mbedtls_ssl_set_hs_psk_opaque(mbedtls_ssl_context *ssl, psa_key_id_t psk) { if ((mbedtls_svc_key_id_is_null(psk)) || (ssl->handshake == NULL)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ssl_remove_psk(ssl); ssl->handshake->psk_opaque = psk; return 0; } #endif /* MBEDTLS_USE_PSA_CRYPTO */ void mbedtls_ssl_conf_psk_cb(mbedtls_ssl_config *conf, int (*f_psk)(void *, mbedtls_ssl_context *, const unsigned char *, size_t), void *p_psk) { conf->f_psk = f_psk; conf->p_psk = p_psk; } #endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */ #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) #if !defined(MBEDTLS_DEPRECATED_REMOVED) int mbedtls_ssl_conf_dh_param(mbedtls_ssl_config *conf, const char *dhm_P, const char *dhm_G) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; if ((ret = mbedtls_mpi_read_string(&conf->dhm_P, 16, dhm_P)) != 0 || (ret = mbedtls_mpi_read_string(&conf->dhm_G, 16, dhm_G)) != 0) { mbedtls_mpi_free(&conf->dhm_P); mbedtls_mpi_free(&conf->dhm_G); return ret; } return 0; } #endif /* MBEDTLS_DEPRECATED_REMOVED */ int mbedtls_ssl_conf_dh_param_bin(mbedtls_ssl_config *conf, const unsigned char *dhm_P, size_t P_len, const unsigned char *dhm_G, size_t G_len) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; mbedtls_mpi_free(&conf->dhm_P); mbedtls_mpi_free(&conf->dhm_G); if ((ret = mbedtls_mpi_read_binary(&conf->dhm_P, dhm_P, P_len)) != 0 || (ret = mbedtls_mpi_read_binary(&conf->dhm_G, dhm_G, G_len)) != 0) { mbedtls_mpi_free(&conf->dhm_P); mbedtls_mpi_free(&conf->dhm_G); return ret; } return 0; } int mbedtls_ssl_conf_dh_param_ctx(mbedtls_ssl_config *conf, mbedtls_dhm_context *dhm_ctx) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; mbedtls_mpi_free(&conf->dhm_P); mbedtls_mpi_free(&conf->dhm_G); if ((ret = mbedtls_mpi_copy(&conf->dhm_P, &dhm_ctx->P)) != 0 || (ret = mbedtls_mpi_copy(&conf->dhm_G, &dhm_ctx->G)) != 0) { mbedtls_mpi_free(&conf->dhm_P); mbedtls_mpi_free(&conf->dhm_G); return ret; } return 0; } #endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_SRV_C */ #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C) /* * Set the minimum length for Diffie-Hellman parameters */ void mbedtls_ssl_conf_dhm_min_bitlen(mbedtls_ssl_config *conf, unsigned int bitlen) { conf->dhm_min_bitlen = bitlen; } #endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_CLI_C */ #if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) /* * Set allowed/preferred hashes for handshake signatures */ void mbedtls_ssl_conf_sig_hashes(mbedtls_ssl_config *conf, const int *hashes) { conf->sig_hashes = hashes; } #endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ #if defined(MBEDTLS_ECP_C) /* * Set the allowed elliptic curves */ void mbedtls_ssl_conf_curves(mbedtls_ssl_config *conf, const mbedtls_ecp_group_id *curve_list) { conf->curve_list = curve_list; } #endif /* MBEDTLS_ECP_C */ #if defined(MBEDTLS_X509_CRT_PARSE_C) int mbedtls_ssl_set_hostname(mbedtls_ssl_context *ssl, const char *hostname) { /* Initialize to suppress unnecessary compiler warning */ size_t hostname_len = 0; /* Check if new hostname is valid before * making any change to current one */ if (hostname != NULL) { hostname_len = strlen(hostname); if (hostname_len > MBEDTLS_SSL_MAX_HOST_NAME_LEN) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } } /* Now it's clear that we will overwrite the old hostname, * so we can free it safely */ if (ssl->hostname != NULL) { mbedtls_platform_zeroize(ssl->hostname, strlen(ssl->hostname)); mbedtls_free(ssl->hostname); } /* Passing NULL as hostname shall clear the old one */ if (hostname == NULL) { ssl->hostname = NULL; } else { ssl->hostname = mbedtls_calloc(1, hostname_len + 1); if (ssl->hostname == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } memcpy(ssl->hostname, hostname, hostname_len); ssl->hostname[hostname_len] = '\0'; } return 0; } #endif /* MBEDTLS_X509_CRT_PARSE_C */ #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) void mbedtls_ssl_conf_sni(mbedtls_ssl_config *conf, int (*f_sni)(void *, mbedtls_ssl_context *, const unsigned char *, size_t), void *p_sni) { conf->f_sni = f_sni; conf->p_sni = p_sni; } #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ #if defined(MBEDTLS_SSL_ALPN) int mbedtls_ssl_conf_alpn_protocols(mbedtls_ssl_config *conf, const char **protos) { size_t cur_len, tot_len; const char **p; /* * RFC 7301 3.1: "Empty strings MUST NOT be included and byte strings * MUST NOT be truncated." * We check lengths now rather than later. */ tot_len = 0; for (p = protos; *p != NULL; p++) { cur_len = strlen(*p); tot_len += cur_len; if ((cur_len == 0) || (cur_len > MBEDTLS_SSL_MAX_ALPN_NAME_LEN) || (tot_len > MBEDTLS_SSL_MAX_ALPN_LIST_LEN)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } } conf->alpn_list = protos; return 0; } const char *mbedtls_ssl_get_alpn_protocol(const mbedtls_ssl_context *ssl) { return ssl->alpn_chosen; } #endif /* MBEDTLS_SSL_ALPN */ #if defined(MBEDTLS_SSL_DTLS_SRTP) void mbedtls_ssl_conf_srtp_mki_value_supported(mbedtls_ssl_config *conf, int support_mki_value) { conf->dtls_srtp_mki_support = support_mki_value; } int mbedtls_ssl_dtls_srtp_set_mki_value(mbedtls_ssl_context *ssl, unsigned char *mki_value, uint16_t mki_len) { if (mki_len > MBEDTLS_TLS_SRTP_MAX_MKI_LENGTH) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (ssl->conf->dtls_srtp_mki_support == MBEDTLS_SSL_DTLS_SRTP_MKI_UNSUPPORTED) { return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } memcpy(ssl->dtls_srtp_info.mki_value, mki_value, mki_len); ssl->dtls_srtp_info.mki_len = mki_len; return 0; } int mbedtls_ssl_conf_dtls_srtp_protection_profiles(mbedtls_ssl_config *conf, const mbedtls_ssl_srtp_profile *profiles) { const mbedtls_ssl_srtp_profile *p; size_t list_size = 0; /* check the profiles list: all entry must be valid, * its size cannot be more than the total number of supported profiles, currently 4 */ for (p = profiles; *p != MBEDTLS_TLS_SRTP_UNSET && list_size <= MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH; p++) { if (mbedtls_ssl_check_srtp_profile_value(*p) != MBEDTLS_TLS_SRTP_UNSET) { list_size++; } else { /* unsupported value, stop parsing and set the size to an error value */ list_size = MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH + 1; } } if (list_size > MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH) { conf->dtls_srtp_profile_list = NULL; conf->dtls_srtp_profile_list_len = 0; return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } conf->dtls_srtp_profile_list = profiles; conf->dtls_srtp_profile_list_len = list_size; return 0; } void mbedtls_ssl_get_dtls_srtp_negotiation_result(const mbedtls_ssl_context *ssl, mbedtls_dtls_srtp_info *dtls_srtp_info) { dtls_srtp_info->chosen_dtls_srtp_profile = ssl->dtls_srtp_info.chosen_dtls_srtp_profile; /* do not copy the mki value if there is no chosen profile */ if (dtls_srtp_info->chosen_dtls_srtp_profile == MBEDTLS_TLS_SRTP_UNSET) { dtls_srtp_info->mki_len = 0; } else { dtls_srtp_info->mki_len = ssl->dtls_srtp_info.mki_len; memcpy(dtls_srtp_info->mki_value, ssl->dtls_srtp_info.mki_value, ssl->dtls_srtp_info.mki_len); } } #endif /* MBEDTLS_SSL_DTLS_SRTP */ void mbedtls_ssl_conf_max_version(mbedtls_ssl_config *conf, int major, int minor) { conf->max_major_ver = major; conf->max_minor_ver = minor; } void mbedtls_ssl_conf_min_version(mbedtls_ssl_config *conf, int major, int minor) { conf->min_major_ver = major; conf->min_minor_ver = minor; } #if defined(MBEDTLS_SSL_FALLBACK_SCSV) && defined(MBEDTLS_SSL_CLI_C) void mbedtls_ssl_conf_fallback(mbedtls_ssl_config *conf, char fallback) { conf->fallback = fallback; } #endif #if defined(MBEDTLS_SSL_SRV_C) void mbedtls_ssl_conf_cert_req_ca_list(mbedtls_ssl_config *conf, char cert_req_ca_list) { conf->cert_req_ca_list = cert_req_ca_list; } #endif #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) void mbedtls_ssl_conf_encrypt_then_mac(mbedtls_ssl_config *conf, char etm) { conf->encrypt_then_mac = etm; } #endif #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) void mbedtls_ssl_conf_extended_master_secret(mbedtls_ssl_config *conf, char ems) { conf->extended_ms = ems; } #endif #if defined(MBEDTLS_ARC4_C) void mbedtls_ssl_conf_arc4_support(mbedtls_ssl_config *conf, char arc4) { conf->arc4_disabled = arc4; } #endif #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) int mbedtls_ssl_conf_max_frag_len(mbedtls_ssl_config *conf, unsigned char mfl_code) { if (mfl_code >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID || ssl_mfl_code_to_length(mfl_code) > MBEDTLS_TLS_EXT_ADV_CONTENT_LEN) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } conf->mfl_code = mfl_code; return 0; } #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ #if defined(MBEDTLS_SSL_TRUNCATED_HMAC) void mbedtls_ssl_conf_truncated_hmac(mbedtls_ssl_config *conf, int truncate) { conf->trunc_hmac = truncate; } #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) void mbedtls_ssl_conf_cbc_record_splitting(mbedtls_ssl_config *conf, char split) { conf->cbc_record_splitting = split; } #endif void mbedtls_ssl_conf_legacy_renegotiation(mbedtls_ssl_config *conf, int allow_legacy) { conf->allow_legacy_renegotiation = allow_legacy; } #if defined(MBEDTLS_SSL_RENEGOTIATION) void mbedtls_ssl_conf_renegotiation(mbedtls_ssl_config *conf, int renegotiation) { conf->disable_renegotiation = renegotiation; } void mbedtls_ssl_conf_renegotiation_enforced(mbedtls_ssl_config *conf, int max_records) { conf->renego_max_records = max_records; } void mbedtls_ssl_conf_renegotiation_period(mbedtls_ssl_config *conf, const unsigned char period[8]) { memcpy(conf->renego_period, period, 8); } #endif /* MBEDTLS_SSL_RENEGOTIATION */ #if defined(MBEDTLS_SSL_SESSION_TICKETS) #if defined(MBEDTLS_SSL_CLI_C) void mbedtls_ssl_conf_session_tickets(mbedtls_ssl_config *conf, int use_tickets) { conf->session_tickets = use_tickets; } #endif #if defined(MBEDTLS_SSL_SRV_C) void mbedtls_ssl_conf_session_tickets_cb(mbedtls_ssl_config *conf, mbedtls_ssl_ticket_write_t *f_ticket_write, mbedtls_ssl_ticket_parse_t *f_ticket_parse, void *p_ticket) { conf->f_ticket_write = f_ticket_write; conf->f_ticket_parse = f_ticket_parse; conf->p_ticket = p_ticket; } #endif #endif /* MBEDTLS_SSL_SESSION_TICKETS */ #if defined(MBEDTLS_SSL_EXPORT_KEYS) void mbedtls_ssl_conf_export_keys_cb(mbedtls_ssl_config *conf, mbedtls_ssl_export_keys_t *f_export_keys, void *p_export_keys) { conf->f_export_keys = f_export_keys; conf->p_export_keys = p_export_keys; } void mbedtls_ssl_conf_export_keys_ext_cb(mbedtls_ssl_config *conf, mbedtls_ssl_export_keys_ext_t *f_export_keys_ext, void *p_export_keys) { conf->f_export_keys_ext = f_export_keys_ext; conf->p_export_keys = p_export_keys; } #endif #if defined(MBEDTLS_SSL_ASYNC_PRIVATE) void mbedtls_ssl_conf_async_private_cb( mbedtls_ssl_config *conf, mbedtls_ssl_async_sign_t *f_async_sign, mbedtls_ssl_async_decrypt_t *f_async_decrypt, mbedtls_ssl_async_resume_t *f_async_resume, mbedtls_ssl_async_cancel_t *f_async_cancel, void *async_config_data) { conf->f_async_sign_start = f_async_sign; conf->f_async_decrypt_start = f_async_decrypt; conf->f_async_resume = f_async_resume; conf->f_async_cancel = f_async_cancel; conf->p_async_config_data = async_config_data; } void *mbedtls_ssl_conf_get_async_config_data(const mbedtls_ssl_config *conf) { return conf->p_async_config_data; } void *mbedtls_ssl_get_async_operation_data(const mbedtls_ssl_context *ssl) { if (ssl->handshake == NULL) { return NULL; } else { return ssl->handshake->user_async_ctx; } } void mbedtls_ssl_set_async_operation_data(mbedtls_ssl_context *ssl, void *ctx) { if (ssl->handshake != NULL) { ssl->handshake->user_async_ctx = ctx; } } #endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ /* * SSL get accessors */ uint32_t mbedtls_ssl_get_verify_result(const mbedtls_ssl_context *ssl) { if (ssl->session != NULL) { return ssl->session->verify_result; } if (ssl->session_negotiate != NULL) { return ssl->session_negotiate->verify_result; } return 0xFFFFFFFF; } const char *mbedtls_ssl_get_ciphersuite(const mbedtls_ssl_context *ssl) { if (ssl == NULL || ssl->session == NULL) { return NULL; } return mbedtls_ssl_get_ciphersuite_name(ssl->session->ciphersuite); } const char *mbedtls_ssl_get_version(const mbedtls_ssl_context *ssl) { #if defined(MBEDTLS_SSL_PROTO_DTLS) if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) { switch (ssl->minor_ver) { case MBEDTLS_SSL_MINOR_VERSION_2: return "DTLSv1.0"; case MBEDTLS_SSL_MINOR_VERSION_3: return "DTLSv1.2"; default: return "unknown (DTLS)"; } } #endif switch (ssl->minor_ver) { case MBEDTLS_SSL_MINOR_VERSION_0: return "SSLv3.0"; case MBEDTLS_SSL_MINOR_VERSION_1: return "TLSv1.0"; case MBEDTLS_SSL_MINOR_VERSION_2: return "TLSv1.1"; case MBEDTLS_SSL_MINOR_VERSION_3: return "TLSv1.2"; default: return "unknown"; } } #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) size_t mbedtls_ssl_get_input_max_frag_len(const mbedtls_ssl_context *ssl) { size_t max_len = MBEDTLS_SSL_MAX_CONTENT_LEN; size_t read_mfl; /* Use the configured MFL for the client if we're past SERVER_HELLO_DONE */ if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT && ssl->state >= MBEDTLS_SSL_SERVER_HELLO_DONE) { return ssl_mfl_code_to_length(ssl->conf->mfl_code); } /* Check if a smaller max length was negotiated */ if (ssl->session_out != NULL) { read_mfl = ssl_mfl_code_to_length(ssl->session_out->mfl_code); if (read_mfl < max_len) { max_len = read_mfl; } } // During a handshake, use the value being negotiated if (ssl->session_negotiate != NULL) { read_mfl = ssl_mfl_code_to_length(ssl->session_negotiate->mfl_code); if (read_mfl < max_len) { max_len = read_mfl; } } return max_len; } size_t mbedtls_ssl_get_output_max_frag_len(const mbedtls_ssl_context *ssl) { size_t max_len; /* * Assume mfl_code is correct since it was checked when set */ max_len = ssl_mfl_code_to_length(ssl->conf->mfl_code); /* Check if a smaller max length was negotiated */ if (ssl->session_out != NULL && ssl_mfl_code_to_length(ssl->session_out->mfl_code) < max_len) { max_len = ssl_mfl_code_to_length(ssl->session_out->mfl_code); } /* During a handshake, use the value being negotiated */ if (ssl->session_negotiate != NULL && ssl_mfl_code_to_length(ssl->session_negotiate->mfl_code) < max_len) { max_len = ssl_mfl_code_to_length(ssl->session_negotiate->mfl_code); } return max_len; } #if !defined(MBEDTLS_DEPRECATED_REMOVED) size_t mbedtls_ssl_get_max_frag_len(const mbedtls_ssl_context *ssl) { return mbedtls_ssl_get_output_max_frag_len(ssl); } #endif /* !MBEDTLS_DEPRECATED_REMOVED */ #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ #if defined(MBEDTLS_SSL_PROTO_DTLS) size_t mbedtls_ssl_get_current_mtu(const mbedtls_ssl_context *ssl) { /* Return unlimited mtu for client hello messages to avoid fragmentation. */ if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT && (ssl->state == MBEDTLS_SSL_CLIENT_HELLO || ssl->state == MBEDTLS_SSL_SERVER_HELLO)) { return 0; } if (ssl->handshake == NULL || ssl->handshake->mtu == 0) { return ssl->mtu; } if (ssl->mtu == 0) { return ssl->handshake->mtu; } return ssl->mtu < ssl->handshake->mtu ? ssl->mtu : ssl->handshake->mtu; } #endif /* MBEDTLS_SSL_PROTO_DTLS */ int mbedtls_ssl_get_max_out_record_payload(const mbedtls_ssl_context *ssl) { size_t max_len = MBEDTLS_SSL_OUT_CONTENT_LEN; #if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && \ !defined(MBEDTLS_SSL_PROTO_DTLS) (void) ssl; #endif #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) const size_t mfl = mbedtls_ssl_get_output_max_frag_len(ssl); if (max_len > mfl) { max_len = mfl; } #endif #if defined(MBEDTLS_SSL_PROTO_DTLS) if (mbedtls_ssl_get_current_mtu(ssl) != 0) { const size_t mtu = mbedtls_ssl_get_current_mtu(ssl); const int ret = mbedtls_ssl_get_record_expansion(ssl); const size_t overhead = (size_t) ret; if (ret < 0) { return ret; } if (mtu <= overhead) { MBEDTLS_SSL_DEBUG_MSG(1, ("MTU too low for record expansion")); return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } if (max_len > mtu - overhead) { max_len = mtu - overhead; } } #endif /* MBEDTLS_SSL_PROTO_DTLS */ #if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && \ !defined(MBEDTLS_SSL_PROTO_DTLS) ((void) ssl); #endif return (int) max_len; } #if defined(MBEDTLS_X509_CRT_PARSE_C) const mbedtls_x509_crt *mbedtls_ssl_get_peer_cert(const mbedtls_ssl_context *ssl) { if (ssl == NULL || ssl->session == NULL) { return NULL; } #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) return ssl->session->peer_cert; #else return NULL; #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ } #endif /* MBEDTLS_X509_CRT_PARSE_C */ #if defined(MBEDTLS_SSL_CLI_C) int mbedtls_ssl_get_session(const mbedtls_ssl_context *ssl, mbedtls_ssl_session *dst) { if (ssl == NULL || dst == NULL || ssl->session == NULL || ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } return mbedtls_ssl_session_copy(dst, ssl->session); } #endif /* MBEDTLS_SSL_CLI_C */ const mbedtls_ssl_session *mbedtls_ssl_get_session_pointer(const mbedtls_ssl_context *ssl) { if (ssl == NULL) { return NULL; } return ssl->session; } /* * Define ticket header determining Mbed TLS version * and structure of the ticket. */ /* * Define bitflag determining compile-time settings influencing * structure of serialized SSL sessions. */ #if defined(MBEDTLS_HAVE_TIME) #define SSL_SERIALIZED_SESSION_CONFIG_TIME 1 #else #define SSL_SERIALIZED_SESSION_CONFIG_TIME 0 #endif /* MBEDTLS_HAVE_TIME */ #if defined(MBEDTLS_X509_CRT_PARSE_C) #define SSL_SERIALIZED_SESSION_CONFIG_CRT 1 #else #define SSL_SERIALIZED_SESSION_CONFIG_CRT 0 #endif /* MBEDTLS_X509_CRT_PARSE_C */ #if defined(MBEDTLS_SSL_CLI_C) && defined(MBEDTLS_SSL_SESSION_TICKETS) #define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET 1 #else #define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET 0 #endif /* MBEDTLS_SSL_CLI_C && MBEDTLS_SSL_SESSION_TICKETS */ #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) #define SSL_SERIALIZED_SESSION_CONFIG_MFL 1 #else #define SSL_SERIALIZED_SESSION_CONFIG_MFL 0 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ #if defined(MBEDTLS_SSL_TRUNCATED_HMAC) #define SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC 1 #else #define SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC 0 #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) #define SSL_SERIALIZED_SESSION_CONFIG_ETM 1 #else #define SSL_SERIALIZED_SESSION_CONFIG_ETM 0 #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ #if defined(MBEDTLS_SSL_SESSION_TICKETS) #define SSL_SERIALIZED_SESSION_CONFIG_TICKET 1 #else #define SSL_SERIALIZED_SESSION_CONFIG_TICKET 0 #endif /* MBEDTLS_SSL_SESSION_TICKETS */ #define SSL_SERIALIZED_SESSION_CONFIG_TIME_BIT 0 #define SSL_SERIALIZED_SESSION_CONFIG_CRT_BIT 1 #define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET_BIT 2 #define SSL_SERIALIZED_SESSION_CONFIG_MFL_BIT 3 #define SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC_BIT 4 #define SSL_SERIALIZED_SESSION_CONFIG_ETM_BIT 5 #define SSL_SERIALIZED_SESSION_CONFIG_TICKET_BIT 6 #define SSL_SERIALIZED_SESSION_CONFIG_BITFLAG \ ((uint16_t) ( \ (SSL_SERIALIZED_SESSION_CONFIG_TIME << SSL_SERIALIZED_SESSION_CONFIG_TIME_BIT) | \ (SSL_SERIALIZED_SESSION_CONFIG_CRT << SSL_SERIALIZED_SESSION_CONFIG_CRT_BIT) | \ (SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET << \ SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET_BIT) | \ (SSL_SERIALIZED_SESSION_CONFIG_MFL << SSL_SERIALIZED_SESSION_CONFIG_MFL_BIT) | \ (SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC << \ SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC_BIT) | \ (SSL_SERIALIZED_SESSION_CONFIG_ETM << SSL_SERIALIZED_SESSION_CONFIG_ETM_BIT) | \ (SSL_SERIALIZED_SESSION_CONFIG_TICKET << SSL_SERIALIZED_SESSION_CONFIG_TICKET_BIT))) static unsigned char ssl_serialized_session_header[] = { MBEDTLS_VERSION_MAJOR, MBEDTLS_VERSION_MINOR, MBEDTLS_VERSION_PATCH, MBEDTLS_BYTE_1(SSL_SERIALIZED_SESSION_CONFIG_BITFLAG), MBEDTLS_BYTE_0(SSL_SERIALIZED_SESSION_CONFIG_BITFLAG), }; /* * Serialize a session in the following format: * (in the presentation language of TLS, RFC 8446 section 3) * * opaque mbedtls_version[3]; // major, minor, patch * opaque session_format[2]; // version-specific 16-bit field determining * // the format of the remaining * // serialized data. * * Note: When updating the format, remember to keep * these version+format bytes. * * // In this version, `session_format` determines * // the setting of those compile-time * // configuration options which influence * // the structure of mbedtls_ssl_session. * uint64 start_time; * uint8 ciphersuite[2]; // defined by the standard * uint8 compression; // 0 or 1 * uint8 session_id_len; // at most 32 * opaque session_id[32]; * opaque master[48]; // fixed length in the standard * uint32 verify_result; * opaque peer_cert<0..2^24-1>; // length 0 means no peer cert * opaque ticket<0..2^24-1>; // length 0 means no ticket * uint32 ticket_lifetime; * uint8 mfl_code; // up to 255 according to standard * uint8 trunc_hmac; // 0 or 1 * uint8 encrypt_then_mac; // 0 or 1 * * The order is the same as in the definition of the structure, except * verify_result is put before peer_cert so that all mandatory fields come * together in one block. */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_session_save(const mbedtls_ssl_session *session, unsigned char omit_header, unsigned char *buf, size_t buf_len, size_t *olen) { unsigned char *p = buf; size_t used = 0; #if defined(MBEDTLS_HAVE_TIME) uint64_t start; #endif #if defined(MBEDTLS_X509_CRT_PARSE_C) #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) size_t cert_len; #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ #endif /* MBEDTLS_X509_CRT_PARSE_C */ if (!omit_header) { /* * Add version identifier */ used += sizeof(ssl_serialized_session_header); if (used <= buf_len) { memcpy(p, ssl_serialized_session_header, sizeof(ssl_serialized_session_header)); p += sizeof(ssl_serialized_session_header); } } /* * Time */ #if defined(MBEDTLS_HAVE_TIME) used += 8; if (used <= buf_len) { start = (uint64_t) session->start; MBEDTLS_PUT_UINT64_BE(start, p, 0); p += 8; } #endif /* MBEDTLS_HAVE_TIME */ /* * Basic mandatory fields */ used += 2 /* ciphersuite */ + 1 /* compression */ + 1 /* id_len */ + sizeof(session->id) + sizeof(session->master) + 4; /* verify_result */ if (used <= buf_len) { MBEDTLS_PUT_UINT16_BE(session->ciphersuite, p, 0); p += 2; *p++ = MBEDTLS_BYTE_0(session->compression); *p++ = MBEDTLS_BYTE_0(session->id_len); memcpy(p, session->id, 32); p += 32; memcpy(p, session->master, 48); p += 48; MBEDTLS_PUT_UINT32_BE(session->verify_result, p, 0); p += 4; } /* * Peer's end-entity certificate */ #if defined(MBEDTLS_X509_CRT_PARSE_C) #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) if (session->peer_cert == NULL) { cert_len = 0; } else { cert_len = session->peer_cert->raw.len; } used += 3 + cert_len; if (used <= buf_len) { *p++ = MBEDTLS_BYTE_2(cert_len); *p++ = MBEDTLS_BYTE_1(cert_len); *p++ = MBEDTLS_BYTE_0(cert_len); if (session->peer_cert != NULL) { memcpy(p, session->peer_cert->raw.p, cert_len); p += cert_len; } } #else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ if (session->peer_cert_digest != NULL) { used += 1 /* type */ + 1 /* length */ + session->peer_cert_digest_len; if (used <= buf_len) { *p++ = (unsigned char) session->peer_cert_digest_type; *p++ = (unsigned char) session->peer_cert_digest_len; memcpy(p, session->peer_cert_digest, session->peer_cert_digest_len); p += session->peer_cert_digest_len; } } else { used += 2; if (used <= buf_len) { *p++ = (unsigned char) MBEDTLS_MD_NONE; *p++ = 0; } } #endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ #endif /* MBEDTLS_X509_CRT_PARSE_C */ /* * Session ticket if any, plus associated data */ #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) used += 3 + session->ticket_len + 4; /* len + ticket + lifetime */ if (used <= buf_len) { *p++ = MBEDTLS_BYTE_2(session->ticket_len); *p++ = MBEDTLS_BYTE_1(session->ticket_len); *p++ = MBEDTLS_BYTE_0(session->ticket_len); if (session->ticket != NULL) { memcpy(p, session->ticket, session->ticket_len); p += session->ticket_len; } MBEDTLS_PUT_UINT32_BE(session->ticket_lifetime, p, 0); p += 4; } #endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ /* * Misc extension-related info */ #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) used += 1; if (used <= buf_len) { *p++ = session->mfl_code; } #endif #if defined(MBEDTLS_SSL_TRUNCATED_HMAC) used += 1; if (used <= buf_len) { *p++ = (unsigned char) ((session->trunc_hmac) & 0xFF); } #endif #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) used += 1; if (used <= buf_len) { *p++ = MBEDTLS_BYTE_0(session->encrypt_then_mac); } #endif /* Done */ *olen = used; if (used > buf_len) { return MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL; } return 0; } /* * Public wrapper for ssl_session_save() */ int mbedtls_ssl_session_save(const mbedtls_ssl_session *session, unsigned char *buf, size_t buf_len, size_t *olen) { return ssl_session_save(session, 0, buf, buf_len, olen); } /* * Deserialize session, see mbedtls_ssl_session_save() for format. * * This internal version is wrapped by a public function that cleans up in * case of error, and has an extra option omit_header. */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_session_load(mbedtls_ssl_session *session, unsigned char omit_header, const unsigned char *buf, size_t len) { const unsigned char *p = buf; const unsigned char * const end = buf + len; #if defined(MBEDTLS_HAVE_TIME) uint64_t start; #endif #if defined(MBEDTLS_X509_CRT_PARSE_C) #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) size_t cert_len; #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ #endif /* MBEDTLS_X509_CRT_PARSE_C */ if (!omit_header) { /* * Check version identifier */ if ((size_t) (end - p) < sizeof(ssl_serialized_session_header)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (memcmp(p, ssl_serialized_session_header, sizeof(ssl_serialized_session_header)) != 0) { return MBEDTLS_ERR_SSL_VERSION_MISMATCH; } p += sizeof(ssl_serialized_session_header); } /* * Time */ #if defined(MBEDTLS_HAVE_TIME) if (8 > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } start = ((uint64_t) p[0] << 56) | ((uint64_t) p[1] << 48) | ((uint64_t) p[2] << 40) | ((uint64_t) p[3] << 32) | ((uint64_t) p[4] << 24) | ((uint64_t) p[5] << 16) | ((uint64_t) p[6] << 8) | ((uint64_t) p[7]); p += 8; session->start = (time_t) start; #endif /* MBEDTLS_HAVE_TIME */ /* * Basic mandatory fields */ if (2 + 1 + 1 + 32 + 48 + 4 > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->ciphersuite = (p[0] << 8) | p[1]; p += 2; session->compression = *p++; session->id_len = *p++; memcpy(session->id, p, 32); p += 32; memcpy(session->master, p, 48); p += 48; session->verify_result = ((uint32_t) p[0] << 24) | ((uint32_t) p[1] << 16) | ((uint32_t) p[2] << 8) | ((uint32_t) p[3]); p += 4; /* Immediately clear invalid pointer values that have been read, in case * we exit early before we replaced them with valid ones. */ #if defined(MBEDTLS_X509_CRT_PARSE_C) #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) session->peer_cert = NULL; #else session->peer_cert_digest = NULL; #endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ #endif /* MBEDTLS_X509_CRT_PARSE_C */ #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) session->ticket = NULL; #endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ /* * Peer certificate */ #if defined(MBEDTLS_X509_CRT_PARSE_C) #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) /* Deserialize CRT from the end of the ticket. */ if (3 > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } cert_len = (p[0] << 16) | (p[1] << 8) | p[2]; p += 3; if (cert_len != 0) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; if (cert_len > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->peer_cert = mbedtls_calloc(1, sizeof(mbedtls_x509_crt)); if (session->peer_cert == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } mbedtls_x509_crt_init(session->peer_cert); if ((ret = mbedtls_x509_crt_parse_der(session->peer_cert, p, cert_len)) != 0) { mbedtls_x509_crt_free(session->peer_cert); mbedtls_free(session->peer_cert); session->peer_cert = NULL; return ret; } p += cert_len; } #else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ /* Deserialize CRT digest from the end of the ticket. */ if (2 > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->peer_cert_digest_type = (mbedtls_md_type_t) *p++; session->peer_cert_digest_len = (size_t) *p++; if (session->peer_cert_digest_len != 0) { const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type(session->peer_cert_digest_type); if (md_info == NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (session->peer_cert_digest_len != mbedtls_md_get_size(md_info)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (session->peer_cert_digest_len > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->peer_cert_digest = mbedtls_calloc(1, session->peer_cert_digest_len); if (session->peer_cert_digest == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } memcpy(session->peer_cert_digest, p, session->peer_cert_digest_len); p += session->peer_cert_digest_len; } #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ #endif /* MBEDTLS_X509_CRT_PARSE_C */ /* * Session ticket and associated data */ #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) if (3 > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->ticket_len = (p[0] << 16) | (p[1] << 8) | p[2]; p += 3; if (session->ticket_len != 0) { if (session->ticket_len > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->ticket = mbedtls_calloc(1, session->ticket_len); if (session->ticket == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } memcpy(session->ticket, p, session->ticket_len); p += session->ticket_len; } if (4 > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->ticket_lifetime = ((uint32_t) p[0] << 24) | ((uint32_t) p[1] << 16) | ((uint32_t) p[2] << 8) | ((uint32_t) p[3]); p += 4; #endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ /* * Misc extension-related info */ #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) if (1 > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->mfl_code = *p++; #endif #if defined(MBEDTLS_SSL_TRUNCATED_HMAC) if (1 > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->trunc_hmac = *p++; #endif #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) if (1 > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->encrypt_then_mac = *p++; #endif /* Done, should have consumed entire buffer */ if (p != end) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } return 0; } /* * Deserialize session: public wrapper for error cleaning */ int mbedtls_ssl_session_load(mbedtls_ssl_session *session, const unsigned char *buf, size_t len) { int ret = ssl_session_load(session, 0, buf, len); if (ret != 0) { mbedtls_ssl_session_free(session); } return ret; } /* * Perform a single step of the SSL handshake */ int mbedtls_ssl_handshake_step(mbedtls_ssl_context *ssl) { int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; if (ssl == NULL || ssl->conf == NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } #if defined(MBEDTLS_SSL_CLI_C) if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) { ret = mbedtls_ssl_handshake_client_step(ssl); } #endif #if defined(MBEDTLS_SSL_SRV_C) if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) { ret = mbedtls_ssl_handshake_server_step(ssl); } #endif return ret; } /* * Perform the SSL handshake */ int mbedtls_ssl_handshake(mbedtls_ssl_context *ssl) { int ret = 0; /* Sanity checks */ if (ssl == NULL || ssl->conf == NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } #if defined(MBEDTLS_SSL_PROTO_DTLS) if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && (ssl->f_set_timer == NULL || ssl->f_get_timer == NULL)) { MBEDTLS_SSL_DEBUG_MSG(1, ("You must use " "mbedtls_ssl_set_timer_cb() for DTLS")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } #endif /* MBEDTLS_SSL_PROTO_DTLS */ MBEDTLS_SSL_DEBUG_MSG(2, ("=> handshake")); /* Main handshake loop */ while (ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER) { ret = mbedtls_ssl_handshake_step(ssl); if (ret != 0) { break; } } MBEDTLS_SSL_DEBUG_MSG(2, ("<= handshake")); return ret; } #if defined(MBEDTLS_SSL_RENEGOTIATION) #if defined(MBEDTLS_SSL_SRV_C) /* * Write HelloRequest to request renegotiation on server */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_write_hello_request(mbedtls_ssl_context *ssl) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; MBEDTLS_SSL_DEBUG_MSG(2, ("=> write hello request")); ssl->out_msglen = 4; ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_REQUEST; if ((ret = mbedtls_ssl_write_handshake_msg(ssl)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_write_handshake_msg", ret); return ret; } MBEDTLS_SSL_DEBUG_MSG(2, ("<= write hello request")); return 0; } #endif /* MBEDTLS_SSL_SRV_C */ /* * Actually renegotiate current connection, triggered by either: * - any side: calling mbedtls_ssl_renegotiate(), * - client: receiving a HelloRequest during mbedtls_ssl_read(), * - server: receiving any handshake message on server during mbedtls_ssl_read() after * the initial handshake is completed. * If the handshake doesn't complete due to waiting for I/O, it will continue * during the next calls to mbedtls_ssl_renegotiate() or mbedtls_ssl_read() respectively. */ int mbedtls_ssl_start_renegotiation(mbedtls_ssl_context *ssl) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; MBEDTLS_SSL_DEBUG_MSG(2, ("=> renegotiate")); if ((ret = ssl_handshake_init(ssl)) != 0) { return ret; } /* RFC 6347 4.2.2: "[...] the HelloRequest will have message_seq = 0 and * the ServerHello will have message_seq = 1" */ #if defined(MBEDTLS_SSL_PROTO_DTLS) if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING) { if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) { ssl->handshake->out_msg_seq = 1; } else { ssl->handshake->in_msg_seq = 1; } } #endif ssl->state = MBEDTLS_SSL_HELLO_REQUEST; ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS; if ((ret = mbedtls_ssl_handshake(ssl)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_handshake", ret); return ret; } MBEDTLS_SSL_DEBUG_MSG(2, ("<= renegotiate")); return 0; } /* * Renegotiate current connection on client, * or request renegotiation on server */ int mbedtls_ssl_renegotiate(mbedtls_ssl_context *ssl) { int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; if (ssl == NULL || ssl->conf == NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } #if defined(MBEDTLS_SSL_SRV_C) /* On server, just send the request */ if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) { if (ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING; /* Did we already try/start sending HelloRequest? */ if (ssl->out_left != 0) { return mbedtls_ssl_flush_output(ssl); } return ssl_write_hello_request(ssl); } #endif /* MBEDTLS_SSL_SRV_C */ #if defined(MBEDTLS_SSL_CLI_C) /* * On client, either start the renegotiation process or, * if already in progress, continue the handshake */ if (ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS) { if (ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if ((ret = mbedtls_ssl_start_renegotiation(ssl)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_start_renegotiation", ret); return ret; } } else { if ((ret = mbedtls_ssl_handshake(ssl)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_handshake", ret); return ret; } } #endif /* MBEDTLS_SSL_CLI_C */ return ret; } #endif /* MBEDTLS_SSL_RENEGOTIATION */ #if defined(MBEDTLS_X509_CRT_PARSE_C) static void ssl_key_cert_free(mbedtls_ssl_key_cert *key_cert) { mbedtls_ssl_key_cert *cur = key_cert, *next; while (cur != NULL) { next = cur->next; mbedtls_free(cur); cur = next; } } #endif /* MBEDTLS_X509_CRT_PARSE_C */ void mbedtls_ssl_handshake_free(mbedtls_ssl_context *ssl) { mbedtls_ssl_handshake_params *handshake = ssl->handshake; if (handshake == NULL) { return; } #if defined(MBEDTLS_SSL_ASYNC_PRIVATE) if (ssl->conf->f_async_cancel != NULL && handshake->async_in_progress != 0) { ssl->conf->f_async_cancel(ssl); handshake->async_in_progress = 0; } #endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ defined(MBEDTLS_SSL_PROTO_TLS1_1) mbedtls_md5_free(&handshake->fin_md5); mbedtls_sha1_free(&handshake->fin_sha1); #endif #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA256_C) #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_abort(&handshake->fin_sha256_psa); #else mbedtls_sha256_free(&handshake->fin_sha256); #endif #endif #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384) #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_abort(&handshake->fin_sha384_psa); #else mbedtls_sha512_free(&handshake->fin_sha512); #endif #endif #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ #if defined(MBEDTLS_DHM_C) mbedtls_dhm_free(&handshake->dhm_ctx); #endif #if defined(MBEDTLS_ECDH_C) mbedtls_ecdh_free(&handshake->ecdh_ctx); #endif #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) mbedtls_ecjpake_free(&handshake->ecjpake_ctx); #if defined(MBEDTLS_SSL_CLI_C) mbedtls_free(handshake->ecjpake_cache); handshake->ecjpake_cache = NULL; handshake->ecjpake_cache_len = 0; #endif #endif #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) /* explicit void pointer cast for buggy MS compiler */ mbedtls_free((void *) handshake->curves); #endif #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) if (handshake->psk != NULL) { mbedtls_platform_zeroize(handshake->psk, handshake->psk_len); mbedtls_free(handshake->psk); } #endif #if defined(MBEDTLS_X509_CRT_PARSE_C) && \ defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) /* * Free only the linked list wrapper, not the keys themselves * since the belong to the SNI callback */ if (handshake->sni_key_cert != NULL) { mbedtls_ssl_key_cert *cur = handshake->sni_key_cert, *next; while (cur != NULL) { next = cur->next; mbedtls_free(cur); cur = next; } } #endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_SERVER_NAME_INDICATION */ #if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED) mbedtls_x509_crt_restart_free(&handshake->ecrs_ctx); if (handshake->ecrs_peer_cert != NULL) { mbedtls_x509_crt_free(handshake->ecrs_peer_cert); mbedtls_free(handshake->ecrs_peer_cert); } #endif #if defined(MBEDTLS_X509_CRT_PARSE_C) && \ !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) mbedtls_pk_free(&handshake->peer_pubkey); #endif /* MBEDTLS_X509_CRT_PARSE_C && !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ #if defined(MBEDTLS_SSL_PROTO_DTLS) mbedtls_free(handshake->verify_cookie); mbedtls_ssl_flight_free(handshake->flight); mbedtls_ssl_buffering_free(ssl); #endif #if defined(MBEDTLS_ECDH_C) && \ defined(MBEDTLS_USE_PSA_CRYPTO) psa_destroy_key(handshake->ecdh_psa_privkey); #endif /* MBEDTLS_ECDH_C && MBEDTLS_USE_PSA_CRYPTO */ mbedtls_platform_zeroize(handshake, sizeof(mbedtls_ssl_handshake_params)); #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) /* If the buffers are too big - reallocate. Because of the way Mbed TLS * processes datagrams and the fact that a datagram is allowed to have * several records in it, it is possible that the I/O buffers are not * empty at this stage */ handle_buffer_resizing(ssl, 1, mbedtls_ssl_get_input_buflen(ssl), mbedtls_ssl_get_output_buflen(ssl)); #endif } void mbedtls_ssl_session_free(mbedtls_ssl_session *session) { if (session == NULL) { return; } #if defined(MBEDTLS_X509_CRT_PARSE_C) ssl_clear_peer_cert(session); #endif #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) mbedtls_free(session->ticket); #endif mbedtls_platform_zeroize(session, sizeof(mbedtls_ssl_session)); } #if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION) #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) #define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID 1u #else #define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID 0u #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ #if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT) #define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT 1u #else #define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT 0u #endif /* MBEDTLS_SSL_DTLS_BADMAC_LIMIT */ #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) #define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY 1u #else #define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY 0u #endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */ #if defined(MBEDTLS_SSL_ALPN) #define SSL_SERIALIZED_CONTEXT_CONFIG_ALPN 1u #else #define SSL_SERIALIZED_CONTEXT_CONFIG_ALPN 0u #endif /* MBEDTLS_SSL_ALPN */ #define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT 0 #define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT 1 #define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY_BIT 2 #define SSL_SERIALIZED_CONTEXT_CONFIG_ALPN_BIT 3 #define SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG \ ((uint32_t) ( \ (SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID << \ SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT) | \ (SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT << \ SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT) | \ (SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY << \ SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY_BIT) | \ (SSL_SERIALIZED_CONTEXT_CONFIG_ALPN << SSL_SERIALIZED_CONTEXT_CONFIG_ALPN_BIT) | \ 0u)) static unsigned char ssl_serialized_context_header[] = { MBEDTLS_VERSION_MAJOR, MBEDTLS_VERSION_MINOR, MBEDTLS_VERSION_PATCH, MBEDTLS_BYTE_1(SSL_SERIALIZED_SESSION_CONFIG_BITFLAG), MBEDTLS_BYTE_0(SSL_SERIALIZED_SESSION_CONFIG_BITFLAG), MBEDTLS_BYTE_2(SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG), MBEDTLS_BYTE_1(SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG), MBEDTLS_BYTE_0(SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG), }; /* * Serialize a full SSL context * * The format of the serialized data is: * (in the presentation language of TLS, RFC 8446 section 3) * * // header * opaque mbedtls_version[3]; // major, minor, patch * opaque context_format[5]; // version-specific field determining * // the format of the remaining * // serialized data. * Note: When updating the format, remember to keep these * version+format bytes. (We may make their size part of the API.) * * // session sub-structure * opaque session<1..2^32-1>; // see mbedtls_ssl_session_save() * // transform sub-structure * uint8 random[64]; // ServerHello.random+ClientHello.random * uint8 in_cid<0..2^8-1> // Connection ID: expected incoming value * uint8 out_cid<0..2^8-1> // Connection ID: outgoing value to use * // fields from ssl_context * uint32 badmac_seen; // DTLS: number of records with failing MAC * uint64 in_window_top; // DTLS: last validated record seq_num * uint64 in_window; // DTLS: bitmask for replay protection * uint8 disable_datagram_packing; // DTLS: only one record per datagram * uint64 cur_out_ctr; // Record layer: outgoing sequence number * uint16 mtu; // DTLS: path mtu (max outgoing fragment size) * uint8 alpn_chosen<0..2^8-1> // ALPN: negotiated application protocol * * Note that many fields of the ssl_context or sub-structures are not * serialized, as they fall in one of the following categories: * * 1. forced value (eg in_left must be 0) * 2. pointer to dynamically-allocated memory (eg session, transform) * 3. value can be re-derived from other data (eg session keys from MS) * 4. value was temporary (eg content of input buffer) * 5. value will be provided by the user again (eg I/O callbacks and context) */ int mbedtls_ssl_context_save(mbedtls_ssl_context *ssl, unsigned char *buf, size_t buf_len, size_t *olen) { unsigned char *p = buf; size_t used = 0; size_t session_len; int ret = 0; /* * Enforce usage restrictions, see "return BAD_INPUT_DATA" in * this function's documentation. * * These are due to assumptions/limitations in the implementation. Some of * them are likely to stay (no handshake in progress) some might go away * (only DTLS) but are currently used to simplify the implementation. */ /* The initial handshake must be over */ if (ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER) { MBEDTLS_SSL_DEBUG_MSG(1, ("Initial handshake isn't over")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (ssl->handshake != NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("Handshake isn't completed")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* Double-check that sub-structures are indeed ready */ if (ssl->transform == NULL || ssl->session == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("Serialised structures aren't ready")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* There must be no pending incoming or outgoing data */ if (mbedtls_ssl_check_pending(ssl) != 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("There is pending incoming data")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (ssl->out_left != 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("There is pending outgoing data")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* Protocol must be DTLS, not TLS */ if (ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM) { MBEDTLS_SSL_DEBUG_MSG(1, ("Only DTLS is supported")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* Version must be 1.2 */ if (ssl->major_ver != MBEDTLS_SSL_MAJOR_VERSION_3) { MBEDTLS_SSL_DEBUG_MSG(1, ("Only version 1.2 supported")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3) { MBEDTLS_SSL_DEBUG_MSG(1, ("Only version 1.2 supported")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* We must be using an AEAD ciphersuite */ if (mbedtls_ssl_transform_uses_aead(ssl->transform) != 1) { MBEDTLS_SSL_DEBUG_MSG(1, ("Only AEAD ciphersuites supported")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* Renegotiation must not be enabled */ #if defined(MBEDTLS_SSL_RENEGOTIATION) if (ssl->conf->disable_renegotiation != MBEDTLS_SSL_RENEGOTIATION_DISABLED) { MBEDTLS_SSL_DEBUG_MSG(1, ("Renegotiation must not be enabled")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } #endif /* * Version and format identifier */ used += sizeof(ssl_serialized_context_header); if (used <= buf_len) { memcpy(p, ssl_serialized_context_header, sizeof(ssl_serialized_context_header)); p += sizeof(ssl_serialized_context_header); } /* * Session (length + data) */ ret = ssl_session_save(ssl->session, 1, NULL, 0, &session_len); if (ret != MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL) { return ret; } used += 4 + session_len; if (used <= buf_len) { MBEDTLS_PUT_UINT32_BE(session_len, p, 0); p += 4; ret = ssl_session_save(ssl->session, 1, p, session_len, &session_len); if (ret != 0) { return ret; } p += session_len; } /* * Transform */ used += sizeof(ssl->transform->randbytes); if (used <= buf_len) { memcpy(p, ssl->transform->randbytes, sizeof(ssl->transform->randbytes)); p += sizeof(ssl->transform->randbytes); } #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) used += 2 + ssl->transform->in_cid_len + ssl->transform->out_cid_len; if (used <= buf_len) { *p++ = ssl->transform->in_cid_len; memcpy(p, ssl->transform->in_cid, ssl->transform->in_cid_len); p += ssl->transform->in_cid_len; *p++ = ssl->transform->out_cid_len; memcpy(p, ssl->transform->out_cid, ssl->transform->out_cid_len); p += ssl->transform->out_cid_len; } #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ /* * Saved fields from top-level ssl_context structure */ #if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT) used += 4; if (used <= buf_len) { MBEDTLS_PUT_UINT32_BE(ssl->badmac_seen, p, 0); p += 4; } #endif /* MBEDTLS_SSL_DTLS_BADMAC_LIMIT */ #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) used += 16; if (used <= buf_len) { MBEDTLS_PUT_UINT64_BE(ssl->in_window_top, p, 0); p += 8; MBEDTLS_PUT_UINT64_BE(ssl->in_window, p, 0); p += 8; } #endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */ #if defined(MBEDTLS_SSL_PROTO_DTLS) used += 1; if (used <= buf_len) { *p++ = ssl->disable_datagram_packing; } #endif /* MBEDTLS_SSL_PROTO_DTLS */ used += 8; if (used <= buf_len) { memcpy(p, ssl->cur_out_ctr, 8); p += 8; } #if defined(MBEDTLS_SSL_PROTO_DTLS) used += 2; if (used <= buf_len) { MBEDTLS_PUT_UINT16_BE(ssl->mtu, p, 0); p += 2; } #endif /* MBEDTLS_SSL_PROTO_DTLS */ #if defined(MBEDTLS_SSL_ALPN) { const uint8_t alpn_len = ssl->alpn_chosen ? (uint8_t) strlen(ssl->alpn_chosen) : 0; used += 1 + alpn_len; if (used <= buf_len) { *p++ = alpn_len; if (ssl->alpn_chosen != NULL) { memcpy(p, ssl->alpn_chosen, alpn_len); p += alpn_len; } } } #endif /* MBEDTLS_SSL_ALPN */ /* * Done */ *olen = used; if (used > buf_len) { return MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL; } MBEDTLS_SSL_DEBUG_BUF(4, "saved context", buf, used); return mbedtls_ssl_session_reset_int(ssl, 0); } /* * Helper to get TLS 1.2 PRF from ciphersuite * (Duplicates bits of logic from ssl_set_handshake_prfs().) */ #if defined(MBEDTLS_SHA256_C) || \ (defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)) typedef int (*tls_prf_fn)(const unsigned char *secret, size_t slen, const char *label, const unsigned char *random, size_t rlen, unsigned char *dstbuf, size_t dlen); static tls_prf_fn ssl_tls12prf_from_cs(int ciphersuite_id) { const mbedtls_ssl_ciphersuite_t * const ciphersuite_info = mbedtls_ssl_ciphersuite_from_id(ciphersuite_id); if (ciphersuite_info == NULL) { return NULL; } #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384) if (ciphersuite_info->mac == MBEDTLS_MD_SHA384) { return tls_prf_sha384; } else #endif #if defined(MBEDTLS_SHA256_C) { if (ciphersuite_info->mac == MBEDTLS_MD_SHA256) { return tls_prf_sha256; } } #endif #if !defined(MBEDTLS_SHA256_C) && \ (!defined(MBEDTLS_SHA512_C) || defined(MBEDTLS_SHA512_NO_SHA384)) (void) ciphersuite_info; #endif return NULL; } #endif /* MBEDTLS_SHA256_C || (MBEDTLS_SHA512_C && !MBEDTLS_SHA512_NO_SHA384) */ /* * Deserialize context, see mbedtls_ssl_context_save() for format. * * This internal version is wrapped by a public function that cleans up in * case of error. */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_context_load(mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len) { const unsigned char *p = buf; const unsigned char * const end = buf + len; size_t session_len; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; tls_prf_fn prf_func = NULL; /* * The context should have been freshly setup or reset. * Give the user an error in case of obvious misuse. * (Checking session is useful because it won't be NULL if we're * renegotiating, or if the user mistakenly loaded a session first.) */ if (ssl->state != MBEDTLS_SSL_HELLO_REQUEST || ssl->session != NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* * We can't check that the config matches the initial one, but we can at * least check it matches the requirements for serializing. */ if (ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM || ssl->conf->max_major_ver < MBEDTLS_SSL_MAJOR_VERSION_3 || ssl->conf->min_major_ver > MBEDTLS_SSL_MAJOR_VERSION_3 || ssl->conf->max_minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 || ssl->conf->min_minor_ver > MBEDTLS_SSL_MINOR_VERSION_3 || #if defined(MBEDTLS_SSL_RENEGOTIATION) ssl->conf->disable_renegotiation != MBEDTLS_SSL_RENEGOTIATION_DISABLED || #endif 0) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } MBEDTLS_SSL_DEBUG_BUF(4, "context to load", buf, len); /* * Check version identifier */ if ((size_t) (end - p) < sizeof(ssl_serialized_context_header)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (memcmp(p, ssl_serialized_context_header, sizeof(ssl_serialized_context_header)) != 0) { return MBEDTLS_ERR_SSL_VERSION_MISMATCH; } p += sizeof(ssl_serialized_context_header); /* * Session */ if ((size_t) (end - p) < 4) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session_len = ((size_t) p[0] << 24) | ((size_t) p[1] << 16) | ((size_t) p[2] << 8) | ((size_t) p[3]); p += 4; /* This has been allocated by ssl_handshake_init(), called by * by either mbedtls_ssl_session_reset_int() or mbedtls_ssl_setup(). */ ssl->session = ssl->session_negotiate; ssl->session_in = ssl->session; ssl->session_out = ssl->session; ssl->session_negotiate = NULL; if ((size_t) (end - p) < session_len) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ret = ssl_session_load(ssl->session, 1, p, session_len); if (ret != 0) { mbedtls_ssl_session_free(ssl->session); return ret; } p += session_len; /* * Transform */ /* This has been allocated by ssl_handshake_init(), called by * by either mbedtls_ssl_session_reset_int() or mbedtls_ssl_setup(). */ ssl->transform = ssl->transform_negotiate; ssl->transform_in = ssl->transform; ssl->transform_out = ssl->transform; ssl->transform_negotiate = NULL; prf_func = ssl_tls12prf_from_cs(ssl->session->ciphersuite); if (prf_func == NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* Read random bytes and populate structure */ if ((size_t) (end - p) < sizeof(ssl->transform->randbytes)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ret = ssl_populate_transform(ssl->transform, ssl->session->ciphersuite, ssl->session->master, #if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) ssl->session->encrypt_then_mac, #endif #if defined(MBEDTLS_SSL_TRUNCATED_HMAC) ssl->session->trunc_hmac, #endif #endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */ #if defined(MBEDTLS_ZLIB_SUPPORT) ssl->session->compression, #endif prf_func, p, /* currently pointing to randbytes */ MBEDTLS_SSL_MINOR_VERSION_3, /* (D)TLS 1.2 is forced */ ssl->conf->endpoint, ssl); if (ret != 0) { return ret; } p += sizeof(ssl->transform->randbytes); #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) /* Read connection IDs and store them */ if ((size_t) (end - p) < 1) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ssl->transform->in_cid_len = *p++; if ((size_t) (end - p) < ssl->transform->in_cid_len + 1u) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } memcpy(ssl->transform->in_cid, p, ssl->transform->in_cid_len); p += ssl->transform->in_cid_len; ssl->transform->out_cid_len = *p++; if ((size_t) (end - p) < ssl->transform->out_cid_len) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } memcpy(ssl->transform->out_cid, p, ssl->transform->out_cid_len); p += ssl->transform->out_cid_len; #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ /* * Saved fields from top-level ssl_context structure */ #if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT) if ((size_t) (end - p) < 4) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ssl->badmac_seen = ((uint32_t) p[0] << 24) | ((uint32_t) p[1] << 16) | ((uint32_t) p[2] << 8) | ((uint32_t) p[3]); p += 4; #endif /* MBEDTLS_SSL_DTLS_BADMAC_LIMIT */ #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) if ((size_t) (end - p) < 16) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ssl->in_window_top = ((uint64_t) p[0] << 56) | ((uint64_t) p[1] << 48) | ((uint64_t) p[2] << 40) | ((uint64_t) p[3] << 32) | ((uint64_t) p[4] << 24) | ((uint64_t) p[5] << 16) | ((uint64_t) p[6] << 8) | ((uint64_t) p[7]); p += 8; ssl->in_window = ((uint64_t) p[0] << 56) | ((uint64_t) p[1] << 48) | ((uint64_t) p[2] << 40) | ((uint64_t) p[3] << 32) | ((uint64_t) p[4] << 24) | ((uint64_t) p[5] << 16) | ((uint64_t) p[6] << 8) | ((uint64_t) p[7]); p += 8; #endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */ #if defined(MBEDTLS_SSL_PROTO_DTLS) if ((size_t) (end - p) < 1) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ssl->disable_datagram_packing = *p++; #endif /* MBEDTLS_SSL_PROTO_DTLS */ if ((size_t) (end - p) < 8) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } memcpy(ssl->cur_out_ctr, p, 8); p += 8; #if defined(MBEDTLS_SSL_PROTO_DTLS) if ((size_t) (end - p) < 2) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ssl->mtu = (p[0] << 8) | p[1]; p += 2; #endif /* MBEDTLS_SSL_PROTO_DTLS */ #if defined(MBEDTLS_SSL_ALPN) { uint8_t alpn_len; const char **cur; if ((size_t) (end - p) < 1) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } alpn_len = *p++; if (alpn_len != 0 && ssl->conf->alpn_list != NULL) { /* alpn_chosen should point to an item in the configured list */ for (cur = ssl->conf->alpn_list; *cur != NULL; cur++) { if (strlen(*cur) == alpn_len && memcmp(p, cur, alpn_len) == 0) { ssl->alpn_chosen = *cur; break; } } } /* can only happen on conf mismatch */ if (alpn_len != 0 && ssl->alpn_chosen == NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } p += alpn_len; } #endif /* MBEDTLS_SSL_ALPN */ /* * Forced fields from top-level ssl_context structure * * Most of them already set to the correct value by mbedtls_ssl_init() and * mbedtls_ssl_reset(), so we only need to set the remaining ones. */ ssl->state = MBEDTLS_SSL_HANDSHAKE_OVER; ssl->major_ver = MBEDTLS_SSL_MAJOR_VERSION_3; ssl->minor_ver = MBEDTLS_SSL_MINOR_VERSION_3; /* Adjust pointers for header fields of outgoing records to * the given transform, accounting for explicit IV and CID. */ mbedtls_ssl_update_out_pointers(ssl, ssl->transform); #if defined(MBEDTLS_SSL_PROTO_DTLS) ssl->in_epoch = 1; #endif /* mbedtls_ssl_reset() leaves the handshake sub-structure allocated, * which we don't want - otherwise we'd end up freeing the wrong transform * by calling mbedtls_ssl_handshake_wrapup_free_hs_transform() * inappropriately. */ if (ssl->handshake != NULL) { mbedtls_ssl_handshake_free(ssl); mbedtls_free(ssl->handshake); ssl->handshake = NULL; } /* * Done - should have consumed entire buffer */ if (p != end) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } return 0; } /* * Deserialize context: public wrapper for error cleaning */ int mbedtls_ssl_context_load(mbedtls_ssl_context *context, const unsigned char *buf, size_t len) { int ret = ssl_context_load(context, buf, len); if (ret != 0) { mbedtls_ssl_free(context); } return ret; } #endif /* MBEDTLS_SSL_CONTEXT_SERIALIZATION */ /* * Free an SSL context */ void mbedtls_ssl_free(mbedtls_ssl_context *ssl) { if (ssl == NULL) { return; } MBEDTLS_SSL_DEBUG_MSG(2, ("=> free")); if (ssl->out_buf != NULL) { #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) size_t out_buf_len = ssl->out_buf_len; #else size_t out_buf_len = MBEDTLS_SSL_OUT_BUFFER_LEN; #endif mbedtls_platform_zeroize(ssl->out_buf, out_buf_len); mbedtls_free(ssl->out_buf); ssl->out_buf = NULL; } if (ssl->in_buf != NULL) { #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) size_t in_buf_len = ssl->in_buf_len; #else size_t in_buf_len = MBEDTLS_SSL_IN_BUFFER_LEN; #endif mbedtls_platform_zeroize(ssl->in_buf, in_buf_len); mbedtls_free(ssl->in_buf); ssl->in_buf = NULL; } #if defined(MBEDTLS_ZLIB_SUPPORT) if (ssl->compress_buf != NULL) { mbedtls_platform_zeroize(ssl->compress_buf, MBEDTLS_SSL_COMPRESS_BUFFER_LEN); mbedtls_free(ssl->compress_buf); } #endif if (ssl->transform) { mbedtls_ssl_transform_free(ssl->transform); mbedtls_free(ssl->transform); } if (ssl->handshake) { mbedtls_ssl_handshake_free(ssl); mbedtls_ssl_transform_free(ssl->transform_negotiate); mbedtls_ssl_session_free(ssl->session_negotiate); mbedtls_free(ssl->handshake); mbedtls_free(ssl->transform_negotiate); mbedtls_free(ssl->session_negotiate); } if (ssl->session) { mbedtls_ssl_session_free(ssl->session); mbedtls_free(ssl->session); } #if defined(MBEDTLS_X509_CRT_PARSE_C) if (ssl->hostname != NULL) { mbedtls_platform_zeroize(ssl->hostname, strlen(ssl->hostname)); mbedtls_free(ssl->hostname); } #endif #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) if (mbedtls_ssl_hw_record_finish != NULL) { MBEDTLS_SSL_DEBUG_MSG(2, ("going for mbedtls_ssl_hw_record_finish()")); mbedtls_ssl_hw_record_finish(ssl); } #endif #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) mbedtls_free(ssl->cli_id); #endif MBEDTLS_SSL_DEBUG_MSG(2, ("<= free")); /* Actually clear after last debug message */ mbedtls_platform_zeroize(ssl, sizeof(mbedtls_ssl_context)); } /* * Initialize mbedtls_ssl_config */ void mbedtls_ssl_config_init(mbedtls_ssl_config *conf) { memset(conf, 0, sizeof(mbedtls_ssl_config)); } #if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) static int ssl_preset_default_hashes[] = { #if defined(MBEDTLS_SHA512_C) MBEDTLS_MD_SHA512, #endif #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384) MBEDTLS_MD_SHA384, #endif #if defined(MBEDTLS_SHA256_C) MBEDTLS_MD_SHA256, MBEDTLS_MD_SHA224, #endif #if defined(MBEDTLS_SHA1_C) && defined(MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_KEY_EXCHANGE) MBEDTLS_MD_SHA1, #endif MBEDTLS_MD_NONE }; #endif static int ssl_preset_suiteb_ciphersuites[] = { MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, 0 }; #if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) static int ssl_preset_suiteb_hashes[] = { MBEDTLS_MD_SHA256, MBEDTLS_MD_SHA384, MBEDTLS_MD_NONE }; #endif #if defined(MBEDTLS_ECP_C) static mbedtls_ecp_group_id ssl_preset_suiteb_curves[] = { #if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) MBEDTLS_ECP_DP_SECP256R1, #endif #if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED) MBEDTLS_ECP_DP_SECP384R1, #endif MBEDTLS_ECP_DP_NONE }; #endif /* * Load default in mbedtls_ssl_config */ int mbedtls_ssl_config_defaults(mbedtls_ssl_config *conf, int endpoint, int transport, int preset) { #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; #endif /* Use the functions here so that they are covered in tests, * but otherwise access member directly for efficiency */ mbedtls_ssl_conf_endpoint(conf, endpoint); mbedtls_ssl_conf_transport(conf, transport); /* * Things that are common to all presets */ #if defined(MBEDTLS_SSL_CLI_C) if (endpoint == MBEDTLS_SSL_IS_CLIENT) { conf->authmode = MBEDTLS_SSL_VERIFY_REQUIRED; #if defined(MBEDTLS_SSL_SESSION_TICKETS) conf->session_tickets = MBEDTLS_SSL_SESSION_TICKETS_ENABLED; #endif } #endif #if defined(MBEDTLS_ARC4_C) conf->arc4_disabled = MBEDTLS_SSL_ARC4_DISABLED; #endif #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) conf->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED; #endif #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) conf->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED; #endif #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) conf->cbc_record_splitting = MBEDTLS_SSL_CBC_RECORD_SPLITTING_ENABLED; #endif #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) conf->f_cookie_write = ssl_cookie_write_dummy; conf->f_cookie_check = ssl_cookie_check_dummy; #endif #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) conf->anti_replay = MBEDTLS_SSL_ANTI_REPLAY_ENABLED; #endif #if defined(MBEDTLS_SSL_SRV_C) conf->cert_req_ca_list = MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED; #endif #if defined(MBEDTLS_SSL_PROTO_DTLS) conf->hs_timeout_min = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MIN; conf->hs_timeout_max = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MAX; #endif #if defined(MBEDTLS_SSL_RENEGOTIATION) conf->renego_max_records = MBEDTLS_SSL_RENEGO_MAX_RECORDS_DEFAULT; memset(conf->renego_period, 0x00, 2); memset(conf->renego_period + 2, 0xFF, 6); #endif #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) if (endpoint == MBEDTLS_SSL_IS_SERVER) { const unsigned char dhm_p[] = MBEDTLS_DHM_RFC3526_MODP_2048_P_BIN; const unsigned char dhm_g[] = MBEDTLS_DHM_RFC3526_MODP_2048_G_BIN; if ((ret = mbedtls_ssl_conf_dh_param_bin(conf, dhm_p, sizeof(dhm_p), dhm_g, sizeof(dhm_g))) != 0) { return ret; } } #endif /* * Preset-specific defaults */ switch (preset) { /* * NSA Suite B */ case MBEDTLS_SSL_PRESET_SUITEB: conf->min_major_ver = MBEDTLS_SSL_MAJOR_VERSION_3; conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_3; /* TLS 1.2 */ conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION; conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION; conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = ssl_preset_suiteb_ciphersuites; #if defined(MBEDTLS_X509_CRT_PARSE_C) conf->cert_profile = &mbedtls_x509_crt_profile_suiteb; #endif #if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) conf->sig_hashes = ssl_preset_suiteb_hashes; #endif #if defined(MBEDTLS_ECP_C) conf->curve_list = ssl_preset_suiteb_curves; #endif break; /* * Default */ default: conf->min_major_ver = (MBEDTLS_SSL_MIN_MAJOR_VERSION > MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION) ? MBEDTLS_SSL_MIN_MAJOR_VERSION : MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION; conf->min_minor_ver = (MBEDTLS_SSL_MIN_MINOR_VERSION > MBEDTLS_SSL_MIN_VALID_MINOR_VERSION) ? MBEDTLS_SSL_MIN_MINOR_VERSION : MBEDTLS_SSL_MIN_VALID_MINOR_VERSION; conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION; conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION; #if defined(MBEDTLS_SSL_PROTO_DTLS) if (transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) { conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_2; } #endif conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = mbedtls_ssl_list_ciphersuites(); #if defined(MBEDTLS_X509_CRT_PARSE_C) conf->cert_profile = &mbedtls_x509_crt_profile_default; #endif #if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) conf->sig_hashes = ssl_preset_default_hashes; #endif #if defined(MBEDTLS_ECP_C) conf->curve_list = mbedtls_ecp_grp_id_list(); #endif #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C) conf->dhm_min_bitlen = 1024; #endif } return 0; } /* * Free mbedtls_ssl_config */ void mbedtls_ssl_config_free(mbedtls_ssl_config *conf) { #if defined(MBEDTLS_DHM_C) mbedtls_mpi_free(&conf->dhm_P); mbedtls_mpi_free(&conf->dhm_G); #endif #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) if (conf->psk != NULL) { mbedtls_platform_zeroize(conf->psk, conf->psk_len); mbedtls_free(conf->psk); conf->psk = NULL; conf->psk_len = 0; } if (conf->psk_identity != NULL) { mbedtls_platform_zeroize(conf->psk_identity, conf->psk_identity_len); mbedtls_free(conf->psk_identity); conf->psk_identity = NULL; conf->psk_identity_len = 0; } #endif #if defined(MBEDTLS_X509_CRT_PARSE_C) ssl_key_cert_free(conf->key_cert); #endif mbedtls_platform_zeroize(conf, sizeof(mbedtls_ssl_config)); } #if defined(MBEDTLS_PK_C) && \ (defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECDSA_C)) /* * Convert between MBEDTLS_PK_XXX and SSL_SIG_XXX */ unsigned char mbedtls_ssl_sig_from_pk(mbedtls_pk_context *pk) { #if defined(MBEDTLS_RSA_C) if (mbedtls_pk_can_do(pk, MBEDTLS_PK_RSA)) { return MBEDTLS_SSL_SIG_RSA; } #endif #if defined(MBEDTLS_ECDSA_C) if (mbedtls_pk_can_do(pk, MBEDTLS_PK_ECDSA)) { return MBEDTLS_SSL_SIG_ECDSA; } #endif return MBEDTLS_SSL_SIG_ANON; } unsigned char mbedtls_ssl_sig_from_pk_alg(mbedtls_pk_type_t type) { switch (type) { case MBEDTLS_PK_RSA: return MBEDTLS_SSL_SIG_RSA; case MBEDTLS_PK_ECDSA: case MBEDTLS_PK_ECKEY: return MBEDTLS_SSL_SIG_ECDSA; default: return MBEDTLS_SSL_SIG_ANON; } } mbedtls_pk_type_t mbedtls_ssl_pk_alg_from_sig(unsigned char sig) { switch (sig) { #if defined(MBEDTLS_RSA_C) case MBEDTLS_SSL_SIG_RSA: return MBEDTLS_PK_RSA; #endif #if defined(MBEDTLS_ECDSA_C) case MBEDTLS_SSL_SIG_ECDSA: return MBEDTLS_PK_ECDSA; #endif default: return MBEDTLS_PK_NONE; } } #endif /* MBEDTLS_PK_C && ( MBEDTLS_RSA_C || MBEDTLS_ECDSA_C ) */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) /* Find an entry in a signature-hash set matching a given hash algorithm. */ mbedtls_md_type_t mbedtls_ssl_sig_hash_set_find(mbedtls_ssl_sig_hash_set_t *set, mbedtls_pk_type_t sig_alg) { switch (sig_alg) { case MBEDTLS_PK_RSA: return set->rsa; case MBEDTLS_PK_ECDSA: return set->ecdsa; default: return MBEDTLS_MD_NONE; } } /* Add a signature-hash-pair to a signature-hash set */ void mbedtls_ssl_sig_hash_set_add(mbedtls_ssl_sig_hash_set_t *set, mbedtls_pk_type_t sig_alg, mbedtls_md_type_t md_alg) { switch (sig_alg) { case MBEDTLS_PK_RSA: if (set->rsa == MBEDTLS_MD_NONE) { set->rsa = md_alg; } break; case MBEDTLS_PK_ECDSA: if (set->ecdsa == MBEDTLS_MD_NONE) { set->ecdsa = md_alg; } break; default: break; } } /* Allow exactly one hash algorithm for each signature. */ void mbedtls_ssl_sig_hash_set_const_hash(mbedtls_ssl_sig_hash_set_t *set, mbedtls_md_type_t md_alg) { set->rsa = md_alg; set->ecdsa = md_alg; } #endif /* MBEDTLS_SSL_PROTO_TLS1_2) && MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ /* * Convert from MBEDTLS_SSL_HASH_XXX to MBEDTLS_MD_XXX */ mbedtls_md_type_t mbedtls_ssl_md_alg_from_hash(unsigned char hash) { switch (hash) { #if defined(MBEDTLS_MD5_C) case MBEDTLS_SSL_HASH_MD5: return MBEDTLS_MD_MD5; #endif #if defined(MBEDTLS_SHA1_C) case MBEDTLS_SSL_HASH_SHA1: return MBEDTLS_MD_SHA1; #endif #if defined(MBEDTLS_SHA256_C) case MBEDTLS_SSL_HASH_SHA224: return MBEDTLS_MD_SHA224; case MBEDTLS_SSL_HASH_SHA256: return MBEDTLS_MD_SHA256; #endif #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384) case MBEDTLS_SSL_HASH_SHA384: return MBEDTLS_MD_SHA384; #endif #if defined(MBEDTLS_SHA512_C) case MBEDTLS_SSL_HASH_SHA512: return MBEDTLS_MD_SHA512; #endif default: return MBEDTLS_MD_NONE; } } /* * Convert from MBEDTLS_MD_XXX to MBEDTLS_SSL_HASH_XXX */ unsigned char mbedtls_ssl_hash_from_md_alg(int md) { switch (md) { #if defined(MBEDTLS_MD5_C) case MBEDTLS_MD_MD5: return MBEDTLS_SSL_HASH_MD5; #endif #if defined(MBEDTLS_SHA1_C) case MBEDTLS_MD_SHA1: return MBEDTLS_SSL_HASH_SHA1; #endif #if defined(MBEDTLS_SHA256_C) case MBEDTLS_MD_SHA224: return MBEDTLS_SSL_HASH_SHA224; case MBEDTLS_MD_SHA256: return MBEDTLS_SSL_HASH_SHA256; #endif #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384) case MBEDTLS_MD_SHA384: return MBEDTLS_SSL_HASH_SHA384; #endif #if defined(MBEDTLS_SHA512_C) case MBEDTLS_MD_SHA512: return MBEDTLS_SSL_HASH_SHA512; #endif default: return MBEDTLS_SSL_HASH_NONE; } } #if defined(MBEDTLS_ECP_C) /* * Check if a curve proposed by the peer is in our list. * Return 0 if we're willing to use it, -1 otherwise. */ int mbedtls_ssl_check_curve(const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id) { const mbedtls_ecp_group_id *gid; if (ssl->conf->curve_list == NULL) { return -1; } for (gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++) { if (*gid == grp_id) { return 0; } } return -1; } /* * Same as mbedtls_ssl_check_curve() but takes a TLS ID for the curve. */ int mbedtls_ssl_check_curve_tls_id(const mbedtls_ssl_context *ssl, uint16_t tls_id) { const mbedtls_ecp_curve_info *curve_info = mbedtls_ecp_curve_info_from_tls_id(tls_id); if (curve_info == NULL) { return -1; } return mbedtls_ssl_check_curve(ssl, curve_info->grp_id); } #endif /* MBEDTLS_ECP_C */ #if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) /* * Check if a hash proposed by the peer is in our list. * Return 0 if we're willing to use it, -1 otherwise. */ int mbedtls_ssl_check_sig_hash(const mbedtls_ssl_context *ssl, mbedtls_md_type_t md) { const int *cur; if (ssl->conf->sig_hashes == NULL) { return -1; } for (cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++) { if (*cur == (int) md) { return 0; } } return -1; } #endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ #if defined(MBEDTLS_X509_CRT_PARSE_C) int mbedtls_ssl_check_cert_usage(const mbedtls_x509_crt *cert, const mbedtls_ssl_ciphersuite_t *ciphersuite, int cert_endpoint, uint32_t *flags) { int ret = 0; #if defined(MBEDTLS_X509_CHECK_KEY_USAGE) int usage = 0; #endif #if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) const char *ext_oid; size_t ext_len; #endif #if !defined(MBEDTLS_X509_CHECK_KEY_USAGE) && \ !defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) ((void) cert); ((void) cert_endpoint); ((void) flags); #endif #if defined(MBEDTLS_X509_CHECK_KEY_USAGE) if (cert_endpoint == MBEDTLS_SSL_IS_SERVER) { /* Server part of the key exchange */ switch (ciphersuite->key_exchange) { case MBEDTLS_KEY_EXCHANGE_RSA: case MBEDTLS_KEY_EXCHANGE_RSA_PSK: usage = MBEDTLS_X509_KU_KEY_ENCIPHERMENT; break; case MBEDTLS_KEY_EXCHANGE_DHE_RSA: case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA: case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA: usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE; break; case MBEDTLS_KEY_EXCHANGE_ECDH_RSA: case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA: usage = MBEDTLS_X509_KU_KEY_AGREEMENT; break; /* Don't use default: we want warnings when adding new values */ case MBEDTLS_KEY_EXCHANGE_NONE: case MBEDTLS_KEY_EXCHANGE_PSK: case MBEDTLS_KEY_EXCHANGE_DHE_PSK: case MBEDTLS_KEY_EXCHANGE_ECDHE_PSK: case MBEDTLS_KEY_EXCHANGE_ECJPAKE: usage = 0; } } else { /* Client auth: we only implement rsa_sign and mbedtls_ecdsa_sign for now */ usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE; } if (mbedtls_x509_crt_check_key_usage(cert, usage) != 0) { *flags |= MBEDTLS_X509_BADCERT_KEY_USAGE; ret = -1; } #else ((void) ciphersuite); #endif /* MBEDTLS_X509_CHECK_KEY_USAGE */ #if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) if (cert_endpoint == MBEDTLS_SSL_IS_SERVER) { ext_oid = MBEDTLS_OID_SERVER_AUTH; ext_len = MBEDTLS_OID_SIZE(MBEDTLS_OID_SERVER_AUTH); } else { ext_oid = MBEDTLS_OID_CLIENT_AUTH; ext_len = MBEDTLS_OID_SIZE(MBEDTLS_OID_CLIENT_AUTH); } if (mbedtls_x509_crt_check_extended_key_usage(cert, ext_oid, ext_len) != 0) { *flags |= MBEDTLS_X509_BADCERT_EXT_KEY_USAGE; ret = -1; } #endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */ return ret; } #endif /* MBEDTLS_X509_CRT_PARSE_C */ int mbedtls_ssl_set_calc_verify_md(mbedtls_ssl_context *ssl, int md) { #if defined(MBEDTLS_SSL_PROTO_TLS1_2) if (ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3) { return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; } switch (md) { #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) #if defined(MBEDTLS_MD5_C) case MBEDTLS_SSL_HASH_MD5: return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; #endif #if defined(MBEDTLS_SHA1_C) case MBEDTLS_SSL_HASH_SHA1: ssl->handshake->calc_verify = ssl_calc_verify_tls; break; #endif #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */ #if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384) case MBEDTLS_SSL_HASH_SHA384: ssl->handshake->calc_verify = ssl_calc_verify_tls_sha384; break; #endif #if defined(MBEDTLS_SHA256_C) case MBEDTLS_SSL_HASH_SHA256: ssl->handshake->calc_verify = ssl_calc_verify_tls_sha256; break; #endif default: return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; } return 0; #else /* !MBEDTLS_SSL_PROTO_TLS1_2 */ (void) ssl; (void) md; return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ } #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ defined(MBEDTLS_SSL_PROTO_TLS1_1) int mbedtls_ssl_get_key_exchange_md_ssl_tls(mbedtls_ssl_context *ssl, unsigned char *output, unsigned char *data, size_t data_len) { int ret = 0; mbedtls_md5_context mbedtls_md5; mbedtls_sha1_context mbedtls_sha1; mbedtls_md5_init(&mbedtls_md5); mbedtls_sha1_init(&mbedtls_sha1); /* * digitally-signed struct { * opaque md5_hash[16]; * opaque sha_hash[20]; * }; * * md5_hash * MD5(ClientHello.random + ServerHello.random * + ServerParams); * sha_hash * SHA(ClientHello.random + ServerHello.random * + ServerParams); */ if ((ret = mbedtls_md5_starts_ret(&mbedtls_md5)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md5_starts_ret", ret); goto exit; } if ((ret = mbedtls_md5_update_ret(&mbedtls_md5, ssl->handshake->randbytes, 64)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md5_update_ret", ret); goto exit; } if ((ret = mbedtls_md5_update_ret(&mbedtls_md5, data, data_len)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md5_update_ret", ret); goto exit; } if ((ret = mbedtls_md5_finish_ret(&mbedtls_md5, output)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md5_finish_ret", ret); goto exit; } if ((ret = mbedtls_sha1_starts_ret(&mbedtls_sha1)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_sha1_starts_ret", ret); goto exit; } if ((ret = mbedtls_sha1_update_ret(&mbedtls_sha1, ssl->handshake->randbytes, 64)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_sha1_update_ret", ret); goto exit; } if ((ret = mbedtls_sha1_update_ret(&mbedtls_sha1, data, data_len)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_sha1_update_ret", ret); goto exit; } if ((ret = mbedtls_sha1_finish_ret(&mbedtls_sha1, output + 16)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_sha1_finish_ret", ret); goto exit; } exit: mbedtls_md5_free(&mbedtls_md5); mbedtls_sha1_free(&mbedtls_sha1); if (ret != 0) { mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR); } return ret; } #endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \ MBEDTLS_SSL_PROTO_TLS1_1 */ #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_USE_PSA_CRYPTO) int mbedtls_ssl_get_key_exchange_md_tls1_2(mbedtls_ssl_context *ssl, unsigned char *hash, size_t *hashlen, unsigned char *data, size_t data_len, mbedtls_md_type_t md_alg) { psa_status_t status; psa_hash_operation_t hash_operation = PSA_HASH_OPERATION_INIT; psa_algorithm_t hash_alg = mbedtls_psa_translate_md(md_alg); MBEDTLS_SSL_DEBUG_MSG(3, ("Perform PSA-based computation of digest of ServerKeyExchange")); if ((status = psa_hash_setup(&hash_operation, hash_alg)) != PSA_SUCCESS) { MBEDTLS_SSL_DEBUG_RET(1, "psa_hash_setup", status); goto exit; } if ((status = psa_hash_update(&hash_operation, ssl->handshake->randbytes, 64)) != PSA_SUCCESS) { MBEDTLS_SSL_DEBUG_RET(1, "psa_hash_update", status); goto exit; } if ((status = psa_hash_update(&hash_operation, data, data_len)) != PSA_SUCCESS) { MBEDTLS_SSL_DEBUG_RET(1, "psa_hash_update", status); goto exit; } if ((status = psa_hash_finish(&hash_operation, hash, PSA_HASH_MAX_SIZE, hashlen)) != PSA_SUCCESS) { MBEDTLS_SSL_DEBUG_RET(1, "psa_hash_finish", status); goto exit; } exit: if (status != PSA_SUCCESS) { mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR); switch (status) { case PSA_ERROR_NOT_SUPPORTED: return MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE; case PSA_ERROR_BAD_STATE: /* Intentional fallthrough */ case PSA_ERROR_BUFFER_TOO_SMALL: return MBEDTLS_ERR_MD_BAD_INPUT_DATA; case PSA_ERROR_INSUFFICIENT_MEMORY: return MBEDTLS_ERR_MD_ALLOC_FAILED; default: return MBEDTLS_ERR_MD_HW_ACCEL_FAILED; } } return 0; } #else int mbedtls_ssl_get_key_exchange_md_tls1_2(mbedtls_ssl_context *ssl, unsigned char *hash, size_t *hashlen, unsigned char *data, size_t data_len, mbedtls_md_type_t md_alg) { int ret = 0; mbedtls_md_context_t ctx; const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type(md_alg); *hashlen = mbedtls_md_get_size(md_info); MBEDTLS_SSL_DEBUG_MSG(3, ("Perform mbedtls-based computation of digest of ServerKeyExchange")); mbedtls_md_init(&ctx); /* * digitally-signed struct { * opaque client_random[32]; * opaque server_random[32]; * ServerDHParams params; * }; */ if ((ret = mbedtls_md_setup(&ctx, md_info, 0)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_setup", ret); goto exit; } if ((ret = mbedtls_md_starts(&ctx)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_starts", ret); goto exit; } if ((ret = mbedtls_md_update(&ctx, ssl->handshake->randbytes, 64)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_update", ret); goto exit; } if ((ret = mbedtls_md_update(&ctx, data, data_len)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_update", ret); goto exit; } if ((ret = mbedtls_md_finish(&ctx, hash)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_finish", ret); goto exit; } exit: mbedtls_md_free(&ctx); if (ret != 0) { mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR); } return ret; } #endif /* MBEDTLS_USE_PSA_CRYPTO */ #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ MBEDTLS_SSL_PROTO_TLS1_2 */ #endif /* MBEDTLS_SSL_TLS_C */