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gbe_fork/mbedtls/x509.c
otavepto 92c77cee31 added a new cryptography library Mbed TLS
2023-12-24 14:33:40 +02:00

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/*
* 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/asn1write.h"
#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;
}
/*
* Convert md type to string
*/
#if !defined(MBEDTLS_X509_REMOVE_INFO) && defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
static inline const char *md_type_to_string(mbedtls_md_type_t md_alg)
{
switch (md_alg) {
#if defined(MBEDTLS_MD_CAN_MD5)
case MBEDTLS_MD_MD5:
return "MD5";
#endif
#if defined(MBEDTLS_MD_CAN_SHA1)
case MBEDTLS_MD_SHA1:
return "SHA1";
#endif
#if defined(MBEDTLS_MD_CAN_SHA224)
case MBEDTLS_MD_SHA224:
return "SHA224";
#endif
#if defined(MBEDTLS_MD_CAN_SHA256)
case MBEDTLS_MD_SHA256:
return "SHA256";
#endif
#if defined(MBEDTLS_MD_CAN_SHA384)
case MBEDTLS_MD_SHA384:
return "SHA384";
#endif
#if defined(MBEDTLS_MD_CAN_SHA512)
case MBEDTLS_MD_SHA512:
return "SHA512";
#endif
#if defined(MBEDTLS_MD_CAN_RIPEMD160)
case MBEDTLS_MD_RIPEMD160:
return "RIPEMD160";
#endif
case MBEDTLS_MD_NONE:
return NULL;
default:
return NULL;
}
}
#endif /* !defined(MBEDTLS_X509_REMOVE_INFO) && defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) */
#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;
/* 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 */
mbedtls_asn1_free_named_data_list_shallow(head->next);
head->next = NULL;
return ret;
}
static int x509_date_is_valid(const mbedtls_x509_time *t)
{
unsigned int month_days;
unsigned int year;
switch (t->mon) {
case 1: case 3: case 5: case 7: case 8: case 10: case 12:
month_days = 31;
break;
case 4: case 6: case 9: case 11:
month_days = 30;
break;
case 2:
year = (unsigned int) t->year;
month_days = ((year & 3) || (!(year % 100)
&& (year % 400)))
? 28 : 29;
break;
default:
return MBEDTLS_ERR_X509_INVALID_DATE;
}
if ((unsigned int) (t->day - 1) >= month_days || /* (1 - days in month) */
/* (unsigned int) (t->mon - 1) >= 12 || */ /* (1 - 12) checked above */
(unsigned int) t->year > 9999 || /* (0 - 9999) */
(unsigned int) t->hour > 23 || /* (0 - 23) */
(unsigned int) t->min > 59 || /* (0 - 59) */
(unsigned int) t->sec > 59) { /* (0 - 59) */
return MBEDTLS_ERR_X509_INVALID_DATE;
}
return 0;
}
static int x509_parse2_int(const unsigned char *p)
{
uint32_t d1 = p[0] - '0';
uint32_t d2 = p[1] - '0';
return (d1 < 10 && d2 < 10) ? (int) (d1 * 10 + d2) : -1;
}
/*
* Parse an ASN1_UTC_TIME (yearlen=2) or ASN1_GENERALIZED_TIME (yearlen=4)
* field.
*/
static int x509_parse_time(const unsigned char *p, mbedtls_x509_time *tm,
size_t yearlen)
{
int x;
/*
* Parse year, month, day, hour, minute, second
*/
tm->year = x509_parse2_int(p);
if (tm->year < 0) {
return MBEDTLS_ERR_X509_INVALID_DATE;
}
if (4 == yearlen) {
x = tm->year * 100;
p += 2;
tm->year = x509_parse2_int(p);
if (tm->year < 0) {
return MBEDTLS_ERR_X509_INVALID_DATE;
}
} else {
x = (tm->year < 50) ? 2000 : 1900;
}
tm->year += x;
tm->mon = x509_parse2_int(p + 2);
tm->day = x509_parse2_int(p + 4);
tm->hour = x509_parse2_int(p + 6);
tm->min = x509_parse2_int(p + 8);
tm->sec = x509_parse2_int(p + 10);
return x509_date_is_valid(tm);
}
/*
* 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);
}
/* len is 12 or 14 depending on year_len, plus optional trailing 'Z' */
if (len != year_len + 10 &&
!(len == year_len + 11 && (*p)[(len - 1)] == 'Z')) {
return MBEDTLS_ERR_X509_INVALID_DATE;
}
(*p) += len;
return x509_parse_time(*p - len, tm, year_len);
}
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;
}
static char nibble_to_hex_digit(int i)
{
return (i < 10) ? (i + '0') : (i - 10 + 'A');
}
/*
* 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, asn1_len_size, asn1_tag_size, asn1_tag_len_buf_start;
/* 6 is enough as our asn1 write functions only write one byte for the tag and at most five bytes for the length*/
unsigned char asn1_tag_len_buf[6];
unsigned char *asn1_len_p;
unsigned char c, merge = 0;
const mbedtls_x509_name *name;
const char *short_name = NULL;
char lowbits, highbits;
char s[MBEDTLS_X509_MAX_DN_NAME_SIZE], *p;
int print_hexstring;
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;
}
print_hexstring = (name->val.tag != MBEDTLS_ASN1_UTF8_STRING) &&
(name->val.tag != MBEDTLS_ASN1_PRINTABLE_STRING) &&
(name->val.tag != MBEDTLS_ASN1_IA5_STRING);
if ((ret = mbedtls_oid_get_attr_short_name(&name->oid, &short_name)) == 0) {
ret = mbedtls_snprintf(p, n, "%s=", short_name);
} else {
if ((ret = mbedtls_oid_get_numeric_string(p, n, &name->oid)) > 0) {
n -= ret;
p += ret;
ret = mbedtls_snprintf(p, n, "=");
print_hexstring = 1;
} else if (ret == MBEDTLS_ERR_OID_BUF_TOO_SMALL) {
return MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
} else {
ret = mbedtls_snprintf(p, n, "\?\?=");
}
}
MBEDTLS_X509_SAFE_SNPRINTF;
if (print_hexstring) {
s[0] = '#';
asn1_len_p = asn1_tag_len_buf + sizeof(asn1_tag_len_buf);
if ((ret = mbedtls_asn1_write_len(&asn1_len_p, asn1_tag_len_buf, name->val.len)) < 0) {
return MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
}
asn1_len_size = ret;
if ((ret = mbedtls_asn1_write_tag(&asn1_len_p, asn1_tag_len_buf, name->val.tag)) < 0) {
return MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
}
asn1_tag_size = ret;
asn1_tag_len_buf_start = sizeof(asn1_tag_len_buf) - asn1_len_size - asn1_tag_size;
for (i = 0, j = 1; i < asn1_len_size + asn1_tag_size; i++) {
if (j + 1 >= sizeof(s) - 1) {
return MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
}
c = asn1_tag_len_buf[asn1_tag_len_buf_start+i];
lowbits = (c & 0x0F);
highbits = c >> 4;
s[j++] = nibble_to_hex_digit(highbits);
s[j++] = nibble_to_hex_digit(lowbits);
}
for (i = 0; i < name->val.len; i++) {
if (j + 1 >= sizeof(s) - 1) {
return MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
}
c = name->val.p[i];
lowbits = (c & 0x0F);
highbits = c >> 4;
s[j++] = nibble_to_hex_digit(highbits);
s[j++] = nibble_to_hex_digit(lowbits);
}
} else {
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 4514 Section 2.4
if (c == '\0') {
return MBEDTLS_ERR_X509_INVALID_NAME;
} else {
if (strchr(",=+<>;\"\\", c) ||
((i == 0) && strchr("# ", c)) ||
((i == name->val.len-1) && (c == ' '))) {
if (j + 1 >= sizeof(s) - 1) {
return MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
}
s[j++] = '\\';
}
}
if (c < 32 || c >= 127) {
if (j + 3 >= sizeof(s) - 1) {
return MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
}
s[j++] = '\\';
lowbits = (c & 0x0F);
highbits = c >> 4;
s[j++] = nibble_to_hex_digit(highbits);
s[j] = nibble_to_hex_digit(lowbits);
} 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);
}
#if !defined(MBEDTLS_X509_REMOVE_INFO)
/*
* 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;
pss_opts = (const mbedtls_pk_rsassa_pss_options *) sig_opts;
const char *name = md_type_to_string(md_alg);
const char *mgf_name = md_type_to_string(pss_opts->mgf1_hash_id);
ret = mbedtls_snprintf(p, n, " (%s, MGF1-%s, 0x%02X)",
name ? name : "???",
mgf_name ? mgf_name : "???",
(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);
}
#endif /* MBEDTLS_X509_REMOVE_INFO */
/*
* 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;
}
int mbedtls_x509_time_cmp(const mbedtls_x509_time *t1,
const mbedtls_x509_time *t2)
{
int x;
x = (((t1->year << 9) | (t1->mon << 5) | (t1->day)) -
((t2->year << 9) | (t2->mon << 5) | (t2->day)));
if (x != 0) {
return x;
}
x = (((t1->hour << 12) | (t1->min << 6) | (t1->sec)) -
((t2->hour << 12) | (t2->min << 6) | (t2->sec)));
return x;
}
#if defined(MBEDTLS_HAVE_TIME_DATE)
int mbedtls_x509_time_gmtime(mbedtls_time_t tt, mbedtls_x509_time *now)
{
struct tm tm;
if (mbedtls_platform_gmtime_r(&tt, &tm) == NULL) {
return -1;
}
now->year = tm.tm_year + 1900;
now->mon = tm.tm_mon + 1;
now->day = tm.tm_mday;
now->hour = tm.tm_hour;
now->min = tm.tm_min;
now->sec = tm.tm_sec;
return 0;
}
static int x509_get_current_time(mbedtls_x509_time *now)
{
return mbedtls_x509_time_gmtime(mbedtls_time(NULL), now);
}
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 mbedtls_x509_time_cmp(to, &now) < 0;
}
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 mbedtls_x509_time_cmp(from, &now) > 0;
}
#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 */
/* Common functions for parsing CRT and CSR. */
#if defined(MBEDTLS_X509_CRT_PARSE_C) || defined(MBEDTLS_X509_CSR_PARSE_C)
/*
* OtherName ::= SEQUENCE {
* type-id OBJECT IDENTIFIER,
* value [0] EXPLICIT ANY DEFINED BY type-id }
*
* HardwareModuleName ::= SEQUENCE {
* hwType OBJECT IDENTIFIER,
* hwSerialNum OCTET STRING }
*
* NOTE: we currently only parse and use otherName of type HwModuleName,
* as defined in RFC 4108.
*/
static int x509_get_other_name(const mbedtls_x509_buf *subject_alt_name,
mbedtls_x509_san_other_name *other_name)
{
int ret = 0;
size_t len;
unsigned char *p = subject_alt_name->p;
const unsigned char *end = p + subject_alt_name->len;
mbedtls_x509_buf cur_oid;
if ((subject_alt_name->tag &
(MBEDTLS_ASN1_TAG_CLASS_MASK | MBEDTLS_ASN1_TAG_VALUE_MASK)) !=
(MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_OTHER_NAME)) {
/*
* The given subject alternative name is not of type "othername".
*/
return MBEDTLS_ERR_X509_BAD_INPUT_DATA;
}
if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
MBEDTLS_ASN1_OID)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
}
cur_oid.tag = MBEDTLS_ASN1_OID;
cur_oid.p = p;
cur_oid.len = len;
/*
* Only HwModuleName is currently supported.
*/
if (MBEDTLS_OID_CMP(MBEDTLS_OID_ON_HW_MODULE_NAME, &cur_oid) != 0) {
return MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE;
}
other_name->type_id = cur_oid;
p += len;
if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_CONTEXT_SPECIFIC)) !=
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);
}
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);
}
if ((ret = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OID)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
}
other_name->value.hardware_module_name.oid.tag = MBEDTLS_ASN1_OID;
other_name->value.hardware_module_name.oid.p = p;
other_name->value.hardware_module_name.oid.len = len;
p += len;
if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
MBEDTLS_ASN1_OCTET_STRING)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
}
other_name->value.hardware_module_name.val.tag = MBEDTLS_ASN1_OCTET_STRING;
other_name->value.hardware_module_name.val.p = p;
other_name->value.hardware_module_name.val.len = len;
p += len;
if (p != end) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
return 0;
}
/* Check mbedtls_x509_get_subject_alt_name for detailed description.
*
* In some cases while parsing subject alternative names the sequence tag is optional
* (e.g. CertSerialNumber). This function is designed to handle such case.
*/
int mbedtls_x509_get_subject_alt_name_ext(unsigned char **p,
const unsigned char *end,
mbedtls_x509_sequence *subject_alt_name)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t tag_len;
mbedtls_asn1_sequence *cur = subject_alt_name;
while (*p < end) {
mbedtls_x509_subject_alternative_name tmp_san_name;
mbedtls_x509_buf tmp_san_buf;
memset(&tmp_san_name, 0, sizeof(tmp_san_name));
tmp_san_buf.tag = **p;
(*p)++;
if ((ret = mbedtls_asn1_get_len(p, end, &tag_len)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
}
tmp_san_buf.p = *p;
tmp_san_buf.len = tag_len;
if ((tmp_san_buf.tag & MBEDTLS_ASN1_TAG_CLASS_MASK) !=
MBEDTLS_ASN1_CONTEXT_SPECIFIC) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG);
}
/*
* Check that the SAN is structured correctly by parsing it.
* The SAN structure is discarded afterwards.
*/
ret = mbedtls_x509_parse_subject_alt_name(&tmp_san_buf, &tmp_san_name);
/*
* In case the extension is malformed, return an error,
* and clear the allocated sequences.
*/
if (ret != 0 && ret != MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE) {
mbedtls_asn1_sequence_free(subject_alt_name->next);
subject_alt_name->next = NULL;
return ret;
}
mbedtls_x509_free_subject_alt_name(&tmp_san_name);
/* Allocate and assign next pointer */
if (cur->buf.p != NULL) {
if (cur->next != NULL) {
return MBEDTLS_ERR_X509_INVALID_EXTENSIONS;
}
cur->next = mbedtls_calloc(1, sizeof(mbedtls_asn1_sequence));
if (cur->next == NULL) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
MBEDTLS_ERR_ASN1_ALLOC_FAILED);
}
cur = cur->next;
}
cur->buf = tmp_san_buf;
*p += tmp_san_buf.len;
}
/* Set final sequence entry's next pointer to NULL */
cur->next = NULL;
if (*p != end) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
return 0;
}
/*
* SubjectAltName ::= GeneralNames
*
* GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
*
* GeneralName ::= CHOICE {
* otherName [0] OtherName,
* rfc822Name [1] IA5String,
* dNSName [2] IA5String,
* x400Address [3] ORAddress,
* directoryName [4] Name,
* ediPartyName [5] EDIPartyName,
* uniformResourceIdentifier [6] IA5String,
* iPAddress [7] OCTET STRING,
* registeredID [8] OBJECT IDENTIFIER }
*
* OtherName ::= SEQUENCE {
* type-id OBJECT IDENTIFIER,
* value [0] EXPLICIT ANY DEFINED BY type-id }
*
* EDIPartyName ::= SEQUENCE {
* nameAssigner [0] DirectoryString OPTIONAL,
* partyName [1] DirectoryString }
*
* We list all types, but use the following GeneralName types from RFC 5280:
* "dnsName", "uniformResourceIdentifier" and "hardware_module_name"
* of type "otherName", as defined in RFC 4108.
*/
int mbedtls_x509_get_subject_alt_name(unsigned char **p,
const unsigned char *end,
mbedtls_x509_sequence *subject_alt_name)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t len;
/* Get main sequence tag */
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 (*p + len != end) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
}
return mbedtls_x509_get_subject_alt_name_ext(p, end, subject_alt_name);
}
int mbedtls_x509_get_ns_cert_type(unsigned char **p,
const unsigned char *end,
unsigned char *ns_cert_type)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_x509_bitstring bs = { 0, 0, NULL };
if ((ret = mbedtls_asn1_get_bitstring(p, end, &bs)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
}
/* A bitstring with no flags set is still technically valid, as it will mean
that the certificate has no designated purpose at the time of creation. */
if (bs.len == 0) {
*ns_cert_type = 0;
return 0;
}
if (bs.len != 1) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
MBEDTLS_ERR_ASN1_INVALID_LENGTH);
}
/* Get actual bitstring */
*ns_cert_type = *bs.p;
return 0;
}
int mbedtls_x509_get_key_usage(unsigned char **p,
const unsigned char *end,
unsigned int *key_usage)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t i;
mbedtls_x509_bitstring bs = { 0, 0, NULL };
if ((ret = mbedtls_asn1_get_bitstring(p, end, &bs)) != 0) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
}
/* A bitstring with no flags set is still technically valid, as it will mean
that the certificate has no designated purpose at the time of creation. */
if (bs.len == 0) {
*key_usage = 0;
return 0;
}
/* Get actual bitstring */
*key_usage = 0;
for (i = 0; i < bs.len && i < sizeof(unsigned int); i++) {
*key_usage |= (unsigned int) bs.p[i] << (8*i);
}
return 0;
}
int mbedtls_x509_parse_subject_alt_name(const mbedtls_x509_buf *san_buf,
mbedtls_x509_subject_alternative_name *san)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
switch (san_buf->tag &
(MBEDTLS_ASN1_TAG_CLASS_MASK |
MBEDTLS_ASN1_TAG_VALUE_MASK)) {
/*
* otherName
*/
case (MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_OTHER_NAME):
{
mbedtls_x509_san_other_name other_name;
ret = x509_get_other_name(san_buf, &other_name);
if (ret != 0) {
return ret;
}
memset(san, 0, sizeof(mbedtls_x509_subject_alternative_name));
san->type = MBEDTLS_X509_SAN_OTHER_NAME;
memcpy(&san->san.other_name,
&other_name, sizeof(other_name));
}
break;
/*
* uniformResourceIdentifier
*/
case (MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_UNIFORM_RESOURCE_IDENTIFIER):
{
memset(san, 0, sizeof(mbedtls_x509_subject_alternative_name));
san->type = MBEDTLS_X509_SAN_UNIFORM_RESOURCE_IDENTIFIER;
memcpy(&san->san.unstructured_name,
san_buf, sizeof(*san_buf));
}
break;
/*
* dNSName
*/
case (MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_DNS_NAME):
{
memset(san, 0, sizeof(mbedtls_x509_subject_alternative_name));
san->type = MBEDTLS_X509_SAN_DNS_NAME;
memcpy(&san->san.unstructured_name,
san_buf, sizeof(*san_buf));
}
break;
/*
* IP address
*/
case (MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_IP_ADDRESS):
{
memset(san, 0, sizeof(mbedtls_x509_subject_alternative_name));
san->type = MBEDTLS_X509_SAN_IP_ADDRESS;
// Only IPv6 (16 bytes) and IPv4 (4 bytes) types are supported
if (san_buf->len == 4 || san_buf->len == 16) {
memcpy(&san->san.unstructured_name,
san_buf, sizeof(*san_buf));
} else {
return MBEDTLS_ERR_X509_BAD_INPUT_DATA;
}
}
break;
/*
* rfc822Name
*/
case (MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_RFC822_NAME):
{
memset(san, 0, sizeof(mbedtls_x509_subject_alternative_name));
san->type = MBEDTLS_X509_SAN_RFC822_NAME;
memcpy(&san->san.unstructured_name, san_buf, sizeof(*san_buf));
}
break;
/*
* directoryName
*/
case (MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_DIRECTORY_NAME):
{
size_t name_len;
unsigned char *p = san_buf->p;
memset(san, 0, sizeof(mbedtls_x509_subject_alternative_name));
san->type = MBEDTLS_X509_SAN_DIRECTORY_NAME;
ret = mbedtls_asn1_get_tag(&p, p + san_buf->len, &name_len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE);
if (ret != 0) {
return ret;
}
if ((ret = mbedtls_x509_get_name(&p, p + name_len,
&san->san.directory_name)) != 0) {
return ret;
}
}
break;
/*
* Type not supported
*/
default:
return MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE;
}
return 0;
}
void mbedtls_x509_free_subject_alt_name(mbedtls_x509_subject_alternative_name *san)
{
if (san->type == MBEDTLS_X509_SAN_DIRECTORY_NAME) {
mbedtls_asn1_free_named_data_list_shallow(san->san.directory_name.next);
}
}
#if !defined(MBEDTLS_X509_REMOVE_INFO)
int mbedtls_x509_info_subject_alt_name(char **buf, size_t *size,
const mbedtls_x509_sequence
*subject_alt_name,
const char *prefix)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t i;
size_t n = *size;
char *p = *buf;
const mbedtls_x509_sequence *cur = subject_alt_name;
mbedtls_x509_subject_alternative_name san;
int parse_ret;
while (cur != NULL) {
memset(&san, 0, sizeof(san));
parse_ret = mbedtls_x509_parse_subject_alt_name(&cur->buf, &san);
if (parse_ret != 0) {
if (parse_ret == MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE) {
ret = mbedtls_snprintf(p, n, "\n%s <unsupported>", prefix);
MBEDTLS_X509_SAFE_SNPRINTF;
} else {
ret = mbedtls_snprintf(p, n, "\n%s <malformed>", prefix);
MBEDTLS_X509_SAFE_SNPRINTF;
}
cur = cur->next;
continue;
}
switch (san.type) {
/*
* otherName
*/
case MBEDTLS_X509_SAN_OTHER_NAME:
{
mbedtls_x509_san_other_name *other_name = &san.san.other_name;
ret = mbedtls_snprintf(p, n, "\n%s otherName :", prefix);
MBEDTLS_X509_SAFE_SNPRINTF;
if (MBEDTLS_OID_CMP(MBEDTLS_OID_ON_HW_MODULE_NAME,
&other_name->type_id) == 0) {
ret = mbedtls_snprintf(p, n, "\n%s hardware module name :", prefix);
MBEDTLS_X509_SAFE_SNPRINTF;
ret =
mbedtls_snprintf(p, n, "\n%s hardware type : ", prefix);
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_oid_get_numeric_string(p,
n,
&other_name->value.hardware_module_name.oid);
MBEDTLS_X509_SAFE_SNPRINTF;
ret =
mbedtls_snprintf(p, n, "\n%s hardware serial number : ", prefix);
MBEDTLS_X509_SAFE_SNPRINTF;
for (i = 0; i < other_name->value.hardware_module_name.val.len; i++) {
ret = mbedtls_snprintf(p,
n,
"%02X",
other_name->value.hardware_module_name.val.p[i]);
MBEDTLS_X509_SAFE_SNPRINTF;
}
}/* MBEDTLS_OID_ON_HW_MODULE_NAME */
}
break;
/*
* uniformResourceIdentifier
*/
case MBEDTLS_X509_SAN_UNIFORM_RESOURCE_IDENTIFIER:
{
ret = mbedtls_snprintf(p, n, "\n%s uniformResourceIdentifier : ", prefix);
MBEDTLS_X509_SAFE_SNPRINTF;
if (san.san.unstructured_name.len >= n) {
if (n > 0) {
*p = '\0';
}
return MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
}
memcpy(p, san.san.unstructured_name.p, san.san.unstructured_name.len);
p += san.san.unstructured_name.len;
n -= san.san.unstructured_name.len;
}
break;
/*
* dNSName
* RFC822 Name
*/
case MBEDTLS_X509_SAN_DNS_NAME:
case MBEDTLS_X509_SAN_RFC822_NAME:
{
const char *dns_name = "dNSName";
const char *rfc822_name = "rfc822Name";
ret = mbedtls_snprintf(p, n,
"\n%s %s : ",
prefix,
san.type ==
MBEDTLS_X509_SAN_DNS_NAME ? dns_name : rfc822_name);
MBEDTLS_X509_SAFE_SNPRINTF;
if (san.san.unstructured_name.len >= n) {
if (n > 0) {
*p = '\0';
}
return MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
}
memcpy(p, san.san.unstructured_name.p, san.san.unstructured_name.len);
p += san.san.unstructured_name.len;
n -= san.san.unstructured_name.len;
}
break;
/*
* iPAddress
*/
case MBEDTLS_X509_SAN_IP_ADDRESS:
{
ret = mbedtls_snprintf(p, n, "\n%s %s : ",
prefix, "iPAddress");
MBEDTLS_X509_SAFE_SNPRINTF;
if (san.san.unstructured_name.len >= n) {
if (n > 0) {
*p = '\0';
}
return MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
}
unsigned char *ip = san.san.unstructured_name.p;
// Only IPv6 (16 bytes) and IPv4 (4 bytes) types are supported
if (san.san.unstructured_name.len == 4) {
ret = mbedtls_snprintf(p, n, "%u.%u.%u.%u", ip[0], ip[1], ip[2], ip[3]);
MBEDTLS_X509_SAFE_SNPRINTF;
} else if (san.san.unstructured_name.len == 16) {
ret = mbedtls_snprintf(p, n,
"%X%X:%X%X:%X%X:%X%X:%X%X:%X%X:%X%X:%X%X",
ip[0], ip[1], ip[2], ip[3], ip[4], ip[5], ip[6],
ip[7], ip[8], ip[9], ip[10], ip[11], ip[12], ip[13],
ip[14], ip[15]);
MBEDTLS_X509_SAFE_SNPRINTF;
} else {
if (n > 0) {
*p = '\0';
}
return MBEDTLS_ERR_X509_BAD_INPUT_DATA;
}
}
break;
/*
* directoryName
*/
case MBEDTLS_X509_SAN_DIRECTORY_NAME:
{
ret = mbedtls_snprintf(p, n, "\n%s directoryName : ", prefix);
if (ret < 0 || (size_t) ret >= n) {
mbedtls_x509_free_subject_alt_name(&san);
}
MBEDTLS_X509_SAFE_SNPRINTF;
ret = mbedtls_x509_dn_gets(p, n, &san.san.directory_name);
if (ret < 0) {
mbedtls_x509_free_subject_alt_name(&san);
if (n > 0) {
*p = '\0';
}
return ret;
}
p += ret;
n -= ret;
}
break;
/*
* Type not supported, skip item.
*/
default:
ret = mbedtls_snprintf(p, n, "\n%s <unsupported>", prefix);
MBEDTLS_X509_SAFE_SNPRINTF;
break;
}
/* So far memory is freed only in the case of directoryName
* parsing succeeding, as mbedtls_x509_get_name allocates memory. */
mbedtls_x509_free_subject_alt_name(&san);
cur = cur->next;
}
*p = '\0';
*size = n;
*buf = p;
return 0;
}
#define PRINT_ITEM(i) \
do { \
ret = mbedtls_snprintf(p, n, "%s" i, sep); \
MBEDTLS_X509_SAFE_SNPRINTF; \
sep = ", "; \
} while (0)
#define CERT_TYPE(type, name) \
do { \
if (ns_cert_type & (type)) { \
PRINT_ITEM(name); \
} \
} while (0)
int mbedtls_x509_info_cert_type(char **buf, size_t *size,
unsigned char ns_cert_type)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t n = *size;
char *p = *buf;
const char *sep = "";
CERT_TYPE(MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT, "SSL Client");
CERT_TYPE(MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER, "SSL Server");
CERT_TYPE(MBEDTLS_X509_NS_CERT_TYPE_EMAIL, "Email");
CERT_TYPE(MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING, "Object Signing");
CERT_TYPE(MBEDTLS_X509_NS_CERT_TYPE_RESERVED, "Reserved");
CERT_TYPE(MBEDTLS_X509_NS_CERT_TYPE_SSL_CA, "SSL CA");
CERT_TYPE(MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA, "Email CA");
CERT_TYPE(MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA, "Object Signing CA");
*size = n;
*buf = p;
return 0;
}
#define KEY_USAGE(code, name) \
do { \
if ((key_usage) & (code)) { \
PRINT_ITEM(name); \
} \
} while (0)
int mbedtls_x509_info_key_usage(char **buf, size_t *size,
unsigned int key_usage)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t n = *size;
char *p = *buf;
const char *sep = "";
KEY_USAGE(MBEDTLS_X509_KU_DIGITAL_SIGNATURE, "Digital Signature");
KEY_USAGE(MBEDTLS_X509_KU_NON_REPUDIATION, "Non Repudiation");
KEY_USAGE(MBEDTLS_X509_KU_KEY_ENCIPHERMENT, "Key Encipherment");
KEY_USAGE(MBEDTLS_X509_KU_DATA_ENCIPHERMENT, "Data Encipherment");
KEY_USAGE(MBEDTLS_X509_KU_KEY_AGREEMENT, "Key Agreement");
KEY_USAGE(MBEDTLS_X509_KU_KEY_CERT_SIGN, "Key Cert Sign");
KEY_USAGE(MBEDTLS_X509_KU_CRL_SIGN, "CRL Sign");
KEY_USAGE(MBEDTLS_X509_KU_ENCIPHER_ONLY, "Encipher Only");
KEY_USAGE(MBEDTLS_X509_KU_DECIPHER_ONLY, "Decipher Only");
*size = n;
*buf = p;
return 0;
}
#endif /* MBEDTLS_X509_REMOVE_INFO */
#endif /* MBEDTLS_X509_CRT_PARSE_C || MBEDTLS_X509_CSR_PARSE_C */
#endif /* MBEDTLS_X509_USE_C */
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