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dev/gilles-peskine-arm/pr_3010-8
mbedtls/library/x509.c
Janos Follath 73c616bdc1 Put includes in alphabetical order 
The library style is to start with the includes corresponding to the
current module and then the rest in alphabetical order. Some modules
have several header files (eg. ssl_internal.h).

The recently added error.h includes did not respect this convention and
this commit restores it. In some cases this is not possible just by
moving the error.h declarations. This commit fixes the pre-existing
order in these instances too.
2019-12-19 10:27:57 +00:00

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/*
* X.509 common functions for parsing and verification
*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* 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.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
/*
* 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
*/
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#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 = (unsigned char *) 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 || ( c > 128 && c < 160 ) )
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 ) : "???",
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_SHA1_C */
return( ret );
}
#endif /* MBEDTLS_SELF_TEST */
#endif /* MBEDTLS_X509_USE_C */
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