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mbedtls/library/x509.c
Mateusz Starzyk 1aec64642c Remove certs module from mbedtls. 
Certs will be used only by tests and programs.

Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
2021-03-16 15:51:25 +01:00

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/*
* X.509 common functions for parsing and verification
*
* 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 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
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdio.h>
#include <stdlib.h>
#define mbedtls_free free
#define mbedtls_calloc calloc
#define mbedtls_printf printf
#define mbedtls_snprintf snprintf
#endif
#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) if( ( ret = ( code ) ) != 0 ){ return( ret ); }
#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_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_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_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_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_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_ERR_X509_INVALID_ALG +
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
p = alg->p;
end = p + alg->len;
if( p >= end )
return( 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_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_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_ERR_X509_INVALID_ALG + ret );
if( p != end )
return( 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. Enfore 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_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_ERR_X509_INVALID_ALG + ret );
if( p != end2 )
return( MBEDTLS_ERR_X509_INVALID_ALG +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
}
else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
return( 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_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_ERR_X509_INVALID_ALG +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
}
else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
return( 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_ERR_X509_INVALID_ALG + ret );
if( p != end2 )
return( MBEDTLS_ERR_X509_INVALID_ALG +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
}
else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
return( 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_ERR_X509_INVALID_ALG + ret );
if( p != end2 )
return( 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_ERR_X509_INVALID_ALG + ret );
if( p != end )
return( 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_ERR_X509_INVALID_NAME + ret );
end = *p + len;
if( ( end - *p ) < 1 )
return( 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_ERR_X509_INVALID_NAME + ret );
oid->p = *p;
*p += oid->len;
if( ( end - *p ) < 1 )
return( 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_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_ERR_X509_INVALID_NAME + ret );
val->p = *p;
*p += val->len;
if( *p != end )
{
return( 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().
*/
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;
/* 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 )
return( MBEDTLS_ERR_X509_INVALID_NAME + ret );
end_set = *p + set_len;
while( 1 )
{
if( ( ret = x509_get_attr_type_value( p, end_set, cur ) ) != 0 )
return( ret );
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 )
return( MBEDTLS_ERR_X509_ALLOC_FAILED );
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 )
return( MBEDTLS_ERR_X509_ALLOC_FAILED );
cur = cur->next;
}
}
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_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_ERR_X509_INVALID_DATE +
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
(*p)++;
ret = mbedtls_asn1_get_len( p, end, &len );
if( ret != 0 )
return( 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_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_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_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_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_ERR_X509_INVALID_EXTENSIONS + ret );
if( end != *p + len )
return( 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, 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; i < name->val.len; i++ )
{
if( i >= sizeof( s ) - 1 )
break;
c = name->val.p[i];
if( c < 32 || c >= 127 )
s[i] = '?';
else s[i] = c;
}
s[i] = '\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 */
#endif /* MBEDTLS_X509_USE_C */
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