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mbedtls/library/x509.c
Manuel Pégourié-Gonnard 864108daab Move from gmtime_r to gmtime + mutexes 
* gmtime_r is not standard so -std=c99 warns about it
* Anyway we need global mutexes in the threading layer, so better depend only
  on that, rather that global mutexes + some _r functions
2015-05-29 10:18:09 +02:00

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/*
* X.509 common functions for parsing and verification
*
* Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
*
* This file is part of mbed TLS (https://tls.mbed.org)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* 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/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(_WIN32) && !defined(EFIX64) && !defined(EFI32)
#include <windows.h>
#else
#include <time.h>
#endif
#if defined(MBEDTLS_FS_IO)
#include <stdio.h>
#if !defined(_WIN32)
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#endif
#endif
#define CHECK(code) if( ( ret = code ) != 0 ){ return( ret ); }
/*
* CertificateSerialNumber ::= INTEGER
*/
int mbedtls_x509_get_serial( unsigned char **p, const unsigned char *end,
mbedtls_x509_buf *serial )
{
int ret;
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;
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) paramaters
*/
int mbedtls_x509_get_alg( unsigned char **p, const unsigned char *end,
mbedtls_x509_buf *alg, mbedtls_x509_buf *params )
{
int ret;
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;
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;
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;
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 );
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;
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;
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, unsigned 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;
}
/*
* Time ::= CHOICE {
* utcTime UTCTime,
* generalTime GeneralizedTime }
*/
int mbedtls_x509_get_time( unsigned char **p, const unsigned char *end,
mbedtls_x509_time *time )
{
int ret;
size_t 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 )
{
(*p)++;
ret = mbedtls_asn1_get_len( p, end, &len );
if( ret != 0 )
return( MBEDTLS_ERR_X509_INVALID_DATE + ret );
CHECK( x509_parse_int( p, 2, &time->year ) );
CHECK( x509_parse_int( p, 2, &time->mon ) );
CHECK( x509_parse_int( p, 2, &time->day ) );
CHECK( x509_parse_int( p, 2, &time->hour ) );
CHECK( x509_parse_int( p, 2, &time->min ) );
if( len > 10 )
CHECK( x509_parse_int( p, 2, &time->sec ) );
if( len > 12 && *(*p)++ != 'Z' )
return( MBEDTLS_ERR_X509_INVALID_DATE );
time->year += 100 * ( time->year < 50 );
time->year += 1900;
return( 0 );
}
else if( tag == MBEDTLS_ASN1_GENERALIZED_TIME )
{
(*p)++;
ret = mbedtls_asn1_get_len( p, end, &len );
if( ret != 0 )
return( MBEDTLS_ERR_X509_INVALID_DATE + ret );
CHECK( x509_parse_int( p, 4, &time->year ) );
CHECK( x509_parse_int( p, 2, &time->mon ) );
CHECK( x509_parse_int( p, 2, &time->day ) );
CHECK( x509_parse_int( p, 2, &time->hour ) );
CHECK( x509_parse_int( p, 2, &time->min ) );
if( len > 12 )
CHECK( x509_parse_int( p, 2, &time->sec ) );
if( len > 14 && *(*p)++ != 'Z' )
return( MBEDTLS_ERR_X509_INVALID_DATE );
return( 0 );
}
else
return( MBEDTLS_ERR_X509_INVALID_DATE +
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
}
int mbedtls_x509_get_sig( unsigned char **p, const unsigned char *end, mbedtls_x509_buf *sig )
{
int ret;
size_t len;
if( ( end - *p ) < 1 )
return( MBEDTLS_ERR_X509_INVALID_SIGNATURE +
MBEDTLS_ERR_ASN1_OUT_OF_DATA );
sig->tag = **p;
if( ( ret = mbedtls_asn1_get_bitstring_null( p, end, &len ) ) != 0 )
return( MBEDTLS_ERR_X509_INVALID_SIGNATURE + ret );
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;
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;
size_t len;
if( *p == end )
return( 0 );
ext->tag = **p;
if( ( ret = mbedtls_asn1_get_tag( p, end, &ext->len,
MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | tag ) ) != 0 )
return( ret );
ext->p = *p;
end = *p + ext->len;
/*
* Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension
*
* Extension ::= SEQUENCE {
* extnID OBJECT IDENTIFIER,
* critical BOOLEAN DEFAULT FALSE,
* extnValue OCTET STRING }
*/
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 );
}
#if defined(_MSC_VER) && !defined snprintf && !defined(EFIX64) && \
!defined(EFI32)
#include <stdarg.h>
#if !defined vsnprintf
#define vsnprintf _vsnprintf
#endif // vsnprintf
/*
* Windows _snprintf and _vsnprintf are not compatible to linux versions.
* Result value is not size of buffer needed, but -1 if no fit is possible.
*
* This fuction tries to 'fix' this by at least suggesting enlarging the
* size by 20.
*/
static int compat_snprintf( char *str, size_t size, const char *format, ... )
{
va_list ap;
int res = -1;
va_start( ap, format );
res = vsnprintf( str, size, format, ap );
va_end( ap );
// No quick fix possible
if( res < 0 )
return( (int) size + 20 );
return( res );
}
#define snprintf compat_snprintf
#endif /* _MSC_VER && !snprintf && !EFIX64 && !EFI32 */
#define ERR_BUF_TOO_SMALL -2
#define SAFE_SNPRINTF() \
{ \
if( ret == -1 ) \
return( -1 ); \
\
if( (unsigned int) ret > n ) { \
p[n - 1] = '\0'; \
return( ERR_BUF_TOO_SMALL ); \
} \
\
n -= (unsigned int) ret; \
p += (unsigned int) ret; \
}
/*
* 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;
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 ? " + " : ", " );
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, "\?\?=" );
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 );
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;
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 ) ? ":" : "" );
SAFE_SNPRINTF();
}
if( nr != serial->len )
{
ret = mbedtls_snprintf( p, n, "...." );
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;
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 );
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 );
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 size, const char *name )
{
char *p = buf;
size_t n = size;
int ret;
if( strlen( name ) + sizeof( " key size" ) > size )
return( ERR_BUF_TOO_SMALL );
ret = mbedtls_snprintf( p, n, "%s key size", name );
SAFE_SNPRINTF();
return( 0 );
}
/*
* Return 0 if the mbedtls_x509_time is still valid, or 1 otherwise.
*/
#if defined(MBEDTLS_HAVE_TIME)
static int x509_get_current_time( mbedtls_x509_time *now )
{
#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
SYSTEMTIME st;
GetSystemTime( &st );
now->year = st.wYear;
now->mon = st.wMonth;
now->day = st.wDay;
now->hour = st.wHour;
now->min = st.wMinute;
now->sec = st.wSecond;
#else
struct tm *lt;
time_t tt;
#if defined(MBEDTLS_THREADING_C)
if( mbedtls_mutex_lock( &mbedtls_threading_gmtime_mutex ) != 0 )
return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
#endif
tt = time( NULL );
lt = gmtime( &tt );
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;
#if defined(MBEDTLS_THREADING_C)
if( mbedtls_mutex_unlock( &mbedtls_threading_gmtime_mutex ) != 0 )
return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
#endif
#endif /* _WIN32 && !EFIX64 && !EFI32 */
return( 0 );
}
/*
* 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_expired( 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_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 */
int mbedtls_x509_time_expired( const mbedtls_x509_time *to )
{
((void) to);
return( 0 );
}
int mbedtls_x509_time_future( const mbedtls_x509_time *from )
{
((void) from);
return( 0 );
}
#endif /* MBEDTLS_HAVE_TIME */
#if defined(MBEDTLS_SELF_TEST)
#include "mbedtls/x509_crt.h"
#include "mbedtls/certs.h"
/*
* Checkup routine
*/
int mbedtls_x509_self_test( int verbose )
{
#if defined(MBEDTLS_CERTS_C) && defined(MBEDTLS_SHA1_C)
int ret;
uint32_t flags;
mbedtls_x509_crt cacert;
mbedtls_x509_crt clicert;
if( verbose != 0 )
mbedtls_printf( " X.509 certificate load: " );
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" );
return( ret );
}
mbedtls_x509_crt_init( &cacert );
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" );
return( ret );
}
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" );
return( ret );
}
if( verbose != 0 )
mbedtls_printf( "passed\n\n");
mbedtls_x509_crt_free( &cacert );
mbedtls_x509_crt_free( &clicert );
return( 0 );
#else
((void) verbose);
return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
#endif /* MBEDTLS_CERTS_C && MBEDTLS_SHA1_C */
}
#endif /* MBEDTLS_SELF_TEST */
#endif /* MBEDTLS_X509_USE_C */
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