/*
* X.509 common functions for parsing and verification
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
/*
* The ITU-T X.509 standard defines a certificate format for PKI.
*
* http://www.ietf.org/rfc/rfc5280.txt (Certificates and CRLs)
* http://www.ietf.org/rfc/rfc3279.txt (Alg IDs for CRLs)
* http://www.ietf.org/rfc/rfc2986.txt (CSRs, aka PKCS#10)
*
* http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf
* http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
*/
#include "common.h"
#if defined(MBEDTLS_X509_USE_C)
#include "mbedtls/x509.h"
#include "mbedtls/asn1.h"
#include "mbedtls/error.h"
#include "mbedtls/oid.h"
#include <stdio.h>
#include <string.h>
#if defined(MBEDTLS_PEM_PARSE_C)
#include "mbedtls/pem.h"
#endif
#include "mbedtls/platform.h"
#if defined(MBEDTLS_HAVE_TIME)
#include "mbedtls/platform_time.h"
#endif
#if defined(MBEDTLS_HAVE_TIME_DATE)
#include "mbedtls/platform_util.h"
#include <time.h>
#endif
#define CHECK(code) \
do { \
if ((ret = (code)) != 0) { \
return ret; \
} \
} while (0)
#define CHECK_RANGE(min, max, val) \
do { \
if ((val) < (min) || (val) > (max)) { \
return ret; \
} \
} while (0)
/*
* CertificateSerialNumber ::= INTEGER
*/
int mbedtls_x509_get_serial(unsigned char **p, const unsigned char *end,
mbedtls_x509_buf *serial)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if ((end - *p) < 1) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_SERIAL,
MBEDTLS_ERR_ASN1_OUT_OF_DATA);
}
if (**p != (MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_PRIMITIVE | 2) &&
**p != MBEDTLS_ASN1_INTEGER) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_SERIAL,
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG);
}
serial->tag = *(*p)++;
if ((ret = mbedtls_asn1_get_len(p, end, &serial->len)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_SERIAL, ret);
}
serial->p = *p;
*p += serial->len;
return 0;
}
/* Get an algorithm identifier without parameters (eg for signatures)
*
* AlgorithmIdentifier ::= SEQUENCE {
* algorithm OBJECT IDENTIFIER,
* parameters ANY DEFINED BY algorithm OPTIONAL }
*/
int mbedtls_x509_get_alg_null(unsigned char **p, const unsigned char *end,
mbedtls_x509_buf *alg)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if ((ret = mbedtls_asn1_get_alg_null(p, end, alg)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG, ret);
}
return 0;
}
/*
* Parse an algorithm identifier with (optional) parameters
*/
int mbedtls_x509_get_alg(unsigned char **p, const unsigned char *end,
mbedtls_x509_buf *alg, mbedtls_x509_buf *params)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if ((ret = mbedtls_asn1_get_alg(p, end, alg, params)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG, ret);
}
return 0;
}
#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
/*
* HashAlgorithm ::= AlgorithmIdentifier
*
* AlgorithmIdentifier ::= SEQUENCE {
* algorithm OBJECT IDENTIFIER,
* parameters ANY DEFINED BY algorithm OPTIONAL }
*
* For HashAlgorithm, parameters MUST be NULL or absent.
*/
static int x509_get_hash_alg(const mbedtls_x509_buf *alg, mbedtls_md_type_t *md_alg)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char *p;
const unsigned char *end;
mbedtls_x509_buf md_oid;
size_t len;
/* Make sure we got a SEQUENCE and setup bounds */
if (alg->tag != (MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG,
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG);
}
p = alg->p;
end = p + alg->len;
if (p >= end) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG,
MBEDTLS_ERR_ASN1_OUT_OF_DATA);
}
/* Parse md_oid */
md_oid.tag = *p;
if ((ret = mbedtls_asn1_get_tag(&p, end, &md_oid.len, MBEDTLS_ASN1_OID)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG, ret);
}
md_oid.p = p;
p += md_oid.len;
/* Get md_alg from md_oid */
if ((ret = mbedtls_oid_get_md_alg(&md_oid, md_alg)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG, ret);
}
/* Make sure params is absent of NULL */
if (p == end) {
return 0;
}
if ((ret = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_NULL)) != 0 || len != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG, ret);
}
if (p != end) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
return 0;
}
/*
* RSASSA-PSS-params ::= SEQUENCE {
* hashAlgorithm [0] HashAlgorithm DEFAULT sha1Identifier,
* maskGenAlgorithm [1] MaskGenAlgorithm DEFAULT mgf1SHA1Identifier,
* saltLength [2] INTEGER DEFAULT 20,
* trailerField [3] INTEGER DEFAULT 1 }
* -- Note that the tags in this Sequence are explicit.
*
* RFC 4055 (which defines use of RSASSA-PSS in PKIX) states that the value
* of trailerField MUST be 1, and PKCS#1 v2.2 doesn't even define any other
* option. Enforce this at parsing time.
*/
int mbedtls_x509_get_rsassa_pss_params(const mbedtls_x509_buf *params,
mbedtls_md_type_t *md_alg, mbedtls_md_type_t *mgf_md,
int *salt_len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char *p;
const unsigned char *end, *end2;
size_t len;
mbedtls_x509_buf alg_id, alg_params;
/* First set everything to defaults */
*md_alg = MBEDTLS_MD_SHA1;
*mgf_md = MBEDTLS_MD_SHA1;
*salt_len = 20;
/* Make sure params is a SEQUENCE and setup bounds */
if (params->tag != (MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG,
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG);
}
p = (unsigned char *) params->p;
end = p + params->len;
if (p == end) {
return 0;
}
/*
* HashAlgorithm
*/
if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED |
0)) == 0) {
end2 = p + len;
/* HashAlgorithm ::= AlgorithmIdentifier (without parameters) */
if ((ret = mbedtls_x509_get_alg_null(&p, end2, &alg_id)) != 0) {
return ret;
}
if ((ret = mbedtls_oid_get_md_alg(&alg_id, md_alg)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG, ret);
}
if (p != end2) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
} else if (ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG, ret);
}
if (p == end) {
return 0;
}
/*
* MaskGenAlgorithm
*/
if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED |
1)) == 0) {
end2 = p + len;
/* MaskGenAlgorithm ::= AlgorithmIdentifier (params = HashAlgorithm) */
if ((ret = mbedtls_x509_get_alg(&p, end2, &alg_id, &alg_params)) != 0) {
return ret;
}
/* Only MFG1 is recognised for now */
if (MBEDTLS_OID_CMP(MBEDTLS_OID_MGF1, &alg_id) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE,
MBEDTLS_ERR_OID_NOT_FOUND);
}
/* Parse HashAlgorithm */
if ((ret = x509_get_hash_alg(&alg_params, mgf_md)) != 0) {
return ret;
}
if (p != end2) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
} else if (ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG, ret);
}
if (p == end) {
return 0;
}
/*
* salt_len
*/
if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED |
2)) == 0) {
end2 = p + len;
if ((ret = mbedtls_asn1_get_int(&p, end2, salt_len)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG, ret);
}
if (p != end2) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
} else if (ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG, ret);
}
if (p == end) {
return 0;
}
/*
* trailer_field (if present, must be 1)
*/
if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED |
3)) == 0) {
int trailer_field;
end2 = p + len;
if ((ret = mbedtls_asn1_get_int(&p, end2, &trailer_field)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG, ret);
}
if (p != end2) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
if (trailer_field != 1) {
return MBEDTLS_ERR_X509_INVALID_ALG;
}
} else if (ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG, ret);
}
if (p != end) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_ALG,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
return 0;
}
#endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
/*
* AttributeTypeAndValue ::= SEQUENCE {
* type AttributeType,
* value AttributeValue }
*
* AttributeType ::= OBJECT IDENTIFIER
*
* AttributeValue ::= ANY DEFINED BY AttributeType
*/
static int x509_get_attr_type_value(unsigned char **p,
const unsigned char *end,
mbedtls_x509_name *cur)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t len;
mbedtls_x509_buf *oid;
mbedtls_x509_buf *val;
if ((ret = mbedtls_asn1_get_tag(p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_NAME, ret);
}
end = *p + len;
if ((end - *p) < 1) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_NAME,
MBEDTLS_ERR_ASN1_OUT_OF_DATA);
}
oid = &cur->oid;
oid->tag = **p;
if ((ret = mbedtls_asn1_get_tag(p, end, &oid->len, MBEDTLS_ASN1_OID)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_NAME, ret);
}
oid->p = *p;
*p += oid->len;
if ((end - *p) < 1) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_NAME,
MBEDTLS_ERR_ASN1_OUT_OF_DATA);
}
if (**p != MBEDTLS_ASN1_BMP_STRING && **p != MBEDTLS_ASN1_UTF8_STRING &&
**p != MBEDTLS_ASN1_T61_STRING && **p != MBEDTLS_ASN1_PRINTABLE_STRING &&
**p != MBEDTLS_ASN1_IA5_STRING && **p != MBEDTLS_ASN1_UNIVERSAL_STRING &&
**p != MBEDTLS_ASN1_BIT_STRING) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_NAME,
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG);
}
val = &cur->val;
val->tag = *(*p)++;
if ((ret = mbedtls_asn1_get_len(p, end, &val->len)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_NAME, ret);
}
val->p = *p;
*p += val->len;
if (*p != end) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_NAME,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
cur->next = NULL;
return 0;
}
/*
* Name ::= CHOICE { -- only one possibility for now --
* rdnSequence RDNSequence }
*
* RDNSequence ::= SEQUENCE OF RelativeDistinguishedName
*
* RelativeDistinguishedName ::=
* SET OF AttributeTypeAndValue
*
* AttributeTypeAndValue ::= SEQUENCE {
* type AttributeType,
* value AttributeValue }
*
* AttributeType ::= OBJECT IDENTIFIER
*
* AttributeValue ::= ANY DEFINED BY AttributeType
*
* The data structure is optimized for the common case where each RDN has only
* one element, which is represented as a list of AttributeTypeAndValue.
* For the general case we still use a flat list, but we mark elements of the
* same set so that they are "merged" together in the functions that consume
* this list, eg mbedtls_x509_dn_gets().
*
* On success, this function may allocate a linked list starting at cur->next
* that must later be free'd by the caller using mbedtls_free(). In error
* cases, this function frees all allocated memory internally and the caller
* has no freeing responsibilities.
*/
int mbedtls_x509_get_name(unsigned char **p, const unsigned char *end,
mbedtls_x509_name *cur)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t set_len;
const unsigned char *end_set;
mbedtls_x509_name *head = cur;
mbedtls_x509_name *prev, *allocated;
/* don't use recursion, we'd risk stack overflow if not optimized */
while (1) {
/*
* parse SET
*/
if ((ret = mbedtls_asn1_get_tag(p, end, &set_len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SET)) != 0) {
ret = MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_NAME, ret);
goto error;
}
end_set = *p + set_len;
while (1) {
if ((ret = x509_get_attr_type_value(p, end_set, cur)) != 0) {
goto error;
}
if (*p == end_set) {
break;
}
/* Mark this item as being no the only one in a set */
cur->next_merged = 1;
cur->next = mbedtls_calloc(1, sizeof(mbedtls_x509_name));
if (cur->next == NULL) {
ret = MBEDTLS_ERR_X509_ALLOC_FAILED;
goto error;
}
cur = cur->next;
}
/*
* continue until end of SEQUENCE is reached
*/
if (*p == end) {
return 0;
}
cur->next = mbedtls_calloc(1, sizeof(mbedtls_x509_name));
if (cur->next == NULL) {
ret = MBEDTLS_ERR_X509_ALLOC_FAILED;
goto error;
}
cur = cur->next;
}
error:
/* Skip the first element as we did not allocate it */
allocated = head->next;
while (allocated != NULL) {
prev = allocated;
allocated = allocated->next;
mbedtls_platform_zeroize(prev, sizeof(*prev));
mbedtls_free(prev);
}
mbedtls_platform_zeroize(head, sizeof(*head));
return ret;
}
static int x509_parse_int(unsigned char **p, size_t n, int *res)
{
*res = 0;
for (; n > 0; --n) {
if ((**p < '0') || (**p > '9')) {
return MBEDTLS_ERR_X509_INVALID_DATE;
}
*res *= 10;
*res += (*(*p)++ - '0');
}
return 0;
}
static int x509_date_is_valid(const mbedtls_x509_time *t)
{
int ret = MBEDTLS_ERR_X509_INVALID_DATE;
int month_len;
CHECK_RANGE(0, 9999, t->year);
CHECK_RANGE(0, 23, t->hour);
CHECK_RANGE(0, 59, t->min);
CHECK_RANGE(0, 59, t->sec);
switch (t->mon) {
case 1: case 3: case 5: case 7: case 8: case 10: case 12:
month_len = 31;
break;
case 4: case 6: case 9: case 11:
month_len = 30;
break;
case 2:
if ((!(t->year % 4) && t->year % 100) ||
!(t->year % 400)) {
month_len = 29;
} else {
month_len = 28;
}
break;
default:
return ret;
}
CHECK_RANGE(1, month_len, t->day);
return 0;
}
/*
* Parse an ASN1_UTC_TIME (yearlen=2) or ASN1_GENERALIZED_TIME (yearlen=4)
* field.
*/
static int x509_parse_time(unsigned char **p, size_t len, size_t yearlen,
mbedtls_x509_time *tm)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
/*
* Minimum length is 10 or 12 depending on yearlen
*/
if (len < yearlen + 8) {
return MBEDTLS_ERR_X509_INVALID_DATE;
}
len -= yearlen + 8;
/*
* Parse year, month, day, hour, minute
*/
CHECK(x509_parse_int(p, yearlen, &tm->year));
if (2 == yearlen) {
if (tm->year < 50) {
tm->year += 100;
}
tm->year += 1900;
}
CHECK(x509_parse_int(p, 2, &tm->mon));
CHECK(x509_parse_int(p, 2, &tm->day));
CHECK(x509_parse_int(p, 2, &tm->hour));
CHECK(x509_parse_int(p, 2, &tm->min));
/*
* Parse seconds if present
*/
if (len >= 2) {
CHECK(x509_parse_int(p, 2, &tm->sec));
len -= 2;
} else {
return MBEDTLS_ERR_X509_INVALID_DATE;
}
/*
* Parse trailing 'Z' if present
*/
if (1 == len && 'Z' == **p) {
(*p)++;
len--;
}
/*
* We should have parsed all characters at this point
*/
if (0 != len) {
return MBEDTLS_ERR_X509_INVALID_DATE;
}
CHECK(x509_date_is_valid(tm));
return 0;
}
/*
* Time ::= CHOICE {
* utcTime UTCTime,
* generalTime GeneralizedTime }
*/
int mbedtls_x509_get_time(unsigned char **p, const unsigned char *end,
mbedtls_x509_time *tm)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t len, year_len;
unsigned char tag;
if ((end - *p) < 1) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_DATE,
MBEDTLS_ERR_ASN1_OUT_OF_DATA);
}
tag = **p;
if (tag == MBEDTLS_ASN1_UTC_TIME) {
year_len = 2;
} else if (tag == MBEDTLS_ASN1_GENERALIZED_TIME) {
year_len = 4;
} else {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_DATE,
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG);
}
(*p)++;
ret = mbedtls_asn1_get_len(p, end, &len);
if (ret != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_DATE, ret);
}
return x509_parse_time(p, len, year_len, tm);
}
int mbedtls_x509_get_sig(unsigned char **p, const unsigned char *end, mbedtls_x509_buf *sig)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t len;
int tag_type;
if ((end - *p) < 1) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_SIGNATURE,
MBEDTLS_ERR_ASN1_OUT_OF_DATA);
}
tag_type = **p;
if ((ret = mbedtls_asn1_get_bitstring_null(p, end, &len)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_SIGNATURE, ret);
}
sig->tag = tag_type;
sig->len = len;
sig->p = *p;
*p += len;
return 0;
}
/*
* Get signature algorithm from alg OID and optional parameters
*/
int mbedtls_x509_get_sig_alg(const mbedtls_x509_buf *sig_oid, const mbedtls_x509_buf *sig_params,
mbedtls_md_type_t *md_alg, mbedtls_pk_type_t *pk_alg,
void **sig_opts)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if (*sig_opts != NULL) {
return MBEDTLS_ERR_X509_BAD_INPUT_DATA;
}
if ((ret = mbedtls_oid_get_sig_alg(sig_oid, md_alg, pk_alg)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG, ret);
}
#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
if (*pk_alg == MBEDTLS_PK_RSASSA_PSS) {
mbedtls_pk_rsassa_pss_options *pss_opts;
pss_opts = mbedtls_calloc(1, sizeof(mbedtls_pk_rsassa_pss_options));
if (pss_opts == NULL) {
return MBEDTLS_ERR_X509_ALLOC_FAILED;
}
ret = mbedtls_x509_get_rsassa_pss_params(sig_params,
md_alg,
&pss_opts->mgf1_hash_id,
&pss_opts->expected_salt_len);
if (ret != 0) {
mbedtls_free(pss_opts);
return ret;
}
*sig_opts = (void *) pss_opts;
} else
#endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
{
/* Make sure parameters are absent or NULL */
if ((sig_params->tag != MBEDTLS_ASN1_NULL && sig_params->tag != 0) ||
sig_params->len != 0) {
return MBEDTLS_ERR_X509_INVALID_ALG;
}
}
return 0;
}
/*
* X.509 Extensions (No parsing of extensions, pointer should
* be either manually updated or extensions should be parsed!)
*/
int mbedtls_x509_get_ext(unsigned char **p, const unsigned char *end,
mbedtls_x509_buf *ext, int tag)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t len;
/* Extension structure use EXPLICIT tagging. That is, the actual
* `Extensions` structure is wrapped by a tag-length pair using
* the respective context-specific tag. */
ret = mbedtls_asn1_get_tag(p, end, &ext->len,
MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | tag);
if (ret != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
}
ext->tag = MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | tag;
ext->p = *p;
end = *p + ext->len;
/*
* Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension
*/
if ((ret = mbedtls_asn1_get_tag(p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
}
if (end != *p + len) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
return 0;
}
/*
* Store the name in printable form into buf; no more
* than size characters will be written
*/
int mbedtls_x509_dn_gets(char *buf, size_t size, const mbedtls_x509_name *dn)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t i, j, n;
unsigned char c, merge = 0;
const mbedtls_x509_name *name;
const char *short_name = NULL;
char s[MBEDTLS_X509_MAX_DN_NAME_SIZE], *p;
memset(s, 0, sizeof(s));
name = dn;
p = buf;
n = size;
while (name != NULL) {
if (!name->oid.p) {
name = name->next;
continue;
}
if (name != dn) {
ret = mbedtls_snprintf(p, n, merge ? " + " : ", ");
MBEDTLS_X509_SAFE_SNPRINTF;
}
ret = mbedtls_oid_get_attr_short_name(&name->oid, &short_name);
if (ret == 0) {
ret = mbedtls_snprintf(p, n, "%s=", short_name);
} else {
ret = mbedtls_snprintf(p, n, "\?\?=");
}
MBEDTLS_X509_SAFE_SNPRINTF;
for (i = 0, j = 0; i < name->val.len; i++, j++) {
if (j >= sizeof(s) - 1) {
return MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
}
c = name->val.p[i];
// Special characters requiring escaping, RFC 1779
if (c && strchr(",=+<>#;\"\\", c)) {
if (j + 1 >= sizeof(s) - 1) {
return MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
}
s[j++] = '\\';
}
if (c < 32 || c >= 127) {
s[j] = '?';
} else {
s[j] = c;
}
}
s[j] = '\0';
ret = mbedtls_snprintf(p, n, "%s", s);
MBEDTLS_X509_SAFE_SNPRINTF;
merge = name->next_merged;
name = name->next;
}
return (int) (size - n);
}
/*
* Store the serial in printable form into buf; no more
* than size characters will be written
*/
int mbedtls_x509_serial_gets(char *buf, size_t size, const mbedtls_x509_buf *serial)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t i, n, nr;
char *p;
p = buf;
n = size;
nr = (serial->len <= 32)
? serial->len : 28;
for (i = 0; i < nr; i++) {
if (i == 0 && nr > 1 && serial->p[i] == 0x0) {
continue;
}
ret = mbedtls_snprintf(p, n, "%02X%s",
serial->p[i], (i < nr - 1) ? ":" : "");
MBEDTLS_X509_SAFE_SNPRINTF;
}
if (nr != serial->len) {
ret = mbedtls_snprintf(p, n, "....");
MBEDTLS_X509_SAFE_SNPRINTF;
}
return (int) (size - n);
}
/*
* Helper for writing signature algorithms
*/
int mbedtls_x509_sig_alg_gets(char *buf, size_t size, const mbedtls_x509_buf *sig_oid,
mbedtls_pk_type_t pk_alg, mbedtls_md_type_t md_alg,
const void *sig_opts)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
char *p = buf;
size_t n = size;
const char *desc = NULL;
ret = mbedtls_oid_get_sig_alg_desc(sig_oid, &desc);
if (ret != 0) {
ret = mbedtls_snprintf(p, n, "???");
} else {
ret = mbedtls_snprintf(p, n, "%s", desc);
}
MBEDTLS_X509_SAFE_SNPRINTF;
#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
if (pk_alg == MBEDTLS_PK_RSASSA_PSS) {
const mbedtls_pk_rsassa_pss_options *pss_opts;
const mbedtls_md_info_t *md_info, *mgf_md_info;
pss_opts = (const mbedtls_pk_rsassa_pss_options *) sig_opts;
md_info = mbedtls_md_info_from_type(md_alg);
mgf_md_info = mbedtls_md_info_from_type(pss_opts->mgf1_hash_id);
ret = mbedtls_snprintf(p, n, " (%s, MGF1-%s, 0x%02X)",
md_info ? mbedtls_md_get_name(md_info) : "???",
mgf_md_info ? mbedtls_md_get_name(mgf_md_info) : "???",
(unsigned int) pss_opts->expected_salt_len);
MBEDTLS_X509_SAFE_SNPRINTF;
}
#else
((void) pk_alg);
((void) md_alg);
((void) sig_opts);
#endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
return (int) (size - n);
}
/*
* Helper for writing "RSA key size", "EC key size", etc
*/
int mbedtls_x509_key_size_helper(char *buf, size_t buf_size, const char *name)
{
char *p = buf;
size_t n = buf_size;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
ret = mbedtls_snprintf(p, n, "%s key size", name);
MBEDTLS_X509_SAFE_SNPRINTF;
return 0;
}
#if defined(MBEDTLS_HAVE_TIME_DATE)
/*
* Set the time structure to the current time.
* Return 0 on success, non-zero on failure.
*/
static int x509_get_current_time(mbedtls_x509_time *now)
{
struct tm *lt, tm_buf;
mbedtls_time_t tt;
int ret = 0;
tt = mbedtls_time(NULL);
lt = mbedtls_platform_gmtime_r(&tt, &tm_buf);
if (lt == NULL) {
ret = -1;
} else {
now->year = lt->tm_year + 1900;
now->mon = lt->tm_mon + 1;
now->day = lt->tm_mday;
now->hour = lt->tm_hour;
now->min = lt->tm_min;
now->sec = lt->tm_sec;
}
return ret;
}
/*
* Return 0 if before <= after, 1 otherwise
*/
static int x509_check_time(const mbedtls_x509_time *before, const mbedtls_x509_time *after)
{
if (before->year > after->year) {
return 1;
}
if (before->year == after->year &&
before->mon > after->mon) {
return 1;
}
if (before->year == after->year &&
before->mon == after->mon &&
before->day > after->day) {
return 1;
}
if (before->year == after->year &&
before->mon == after->mon &&
before->day == after->day &&
before->hour > after->hour) {
return 1;
}
if (before->year == after->year &&
before->mon == after->mon &&
before->day == after->day &&
before->hour == after->hour &&
before->min > after->min) {
return 1;
}
if (before->year == after->year &&
before->mon == after->mon &&
before->day == after->day &&
before->hour == after->hour &&
before->min == after->min &&
before->sec > after->sec) {
return 1;
}
return 0;
}
int mbedtls_x509_time_is_past(const mbedtls_x509_time *to)
{
mbedtls_x509_time now;
if (x509_get_current_time(&now) != 0) {
return 1;
}
return x509_check_time(&now, to);
}
int mbedtls_x509_time_is_future(const mbedtls_x509_time *from)
{
mbedtls_x509_time now;
if (x509_get_current_time(&now) != 0) {
return 1;
}
return x509_check_time(from, &now);
}
#else /* MBEDTLS_HAVE_TIME_DATE */
int mbedtls_x509_time_is_past(const mbedtls_x509_time *to)
{
((void) to);
return 0;
}
int mbedtls_x509_time_is_future(const mbedtls_x509_time *from)
{
((void) from);
return 0;
}
#endif /* MBEDTLS_HAVE_TIME_DATE */
#if defined(MBEDTLS_SELF_TEST)
#include "mbedtls/x509_crt.h"
#include "mbedtls/certs.h"
/*
* Checkup routine
*/
int mbedtls_x509_self_test(int verbose)
{
int ret = 0;
#if defined(MBEDTLS_CERTS_C) && defined(MBEDTLS_SHA256_C)
uint32_t flags;
mbedtls_x509_crt cacert;
mbedtls_x509_crt clicert;
if (verbose != 0) {
mbedtls_printf(" X.509 certificate load: ");
}
mbedtls_x509_crt_init(&cacert);
mbedtls_x509_crt_init(&clicert);
ret = mbedtls_x509_crt_parse(&clicert, (const unsigned char *) mbedtls_test_cli_crt,
mbedtls_test_cli_crt_len);
if (ret != 0) {
if (verbose != 0) {
mbedtls_printf("failed\n");
}
goto cleanup;
}
ret = mbedtls_x509_crt_parse(&cacert, (const unsigned char *) mbedtls_test_ca_crt,
mbedtls_test_ca_crt_len);
if (ret != 0) {
if (verbose != 0) {
mbedtls_printf("failed\n");
}
goto cleanup;
}
if (verbose != 0) {
mbedtls_printf("passed\n X.509 signature verify: ");
}
ret = mbedtls_x509_crt_verify(&clicert, &cacert, NULL, NULL, &flags, NULL, NULL);
if (ret != 0) {
if (verbose != 0) {
mbedtls_printf("failed\n");
}
goto cleanup;
}
if (verbose != 0) {
mbedtls_printf("passed\n\n");
}
cleanup:
mbedtls_x509_crt_free(&cacert);
mbedtls_x509_crt_free(&clicert);
#else
((void) verbose);
#endif /* MBEDTLS_CERTS_C && MBEDTLS_SHA256_C */
return ret;
}
#endif /* MBEDTLS_SELF_TEST */
#endif /* MBEDTLS_X509_USE_C */