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mbedtls/library/x509parse.c
Paul Bakker c70b982056 OID functionality moved to a separate module. 
A new OID module has been created that contains the main OID searching
functionality based on type-dependent arrays. A base type is used to
contain the basic values (oid_descriptor_t) and that type is extended to
contain type specific information (like a pk_alg_t).

As a result the rsa sign and verify function prototypes have changed. They
now expect a md_type_t identifier instead of the removed RSA_SIG_XXX
defines.

All OID definitions have been moved to oid.h
All OID matching code is in the OID module.

The RSA PKCS#1 functions cleaned up as a result and adapted to use the
MD layer.

The SSL layer cleanup up as a result and adapted to use the MD layer.

The X509 parser cleaned up and matches OIDs in certificates with new
module and adapted to use the MD layer.

The X509 writer cleaned up and adapted to use the MD layer.

Apps and tests modified accordingly
2013-04-07 22:00:46 +02:00

3490 lines
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/*
* X.509 certificate and private key decoding
*
* Copyright (C) 2006-2011, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* 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/rfc3279.txt
* http://www.ietf.org/rfc/rfc3280.txt
*
* ftp://ftp.rsasecurity.com/pub/pkcs/ascii/pkcs-1v2.asc
*
* 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 "polarssl/config.h"
#if defined(POLARSSL_X509_PARSE_C)
#include "polarssl/x509.h"
#include "polarssl/asn1.h"
#include "polarssl/oid.h"
#include "polarssl/pem.h"
#include "polarssl/des.h"
#if defined(POLARSSL_MD2_C)
#include "polarssl/md2.h"
#endif
#if defined(POLARSSL_MD4_C)
#include "polarssl/md4.h"
#endif
#if defined(POLARSSL_MD5_C)
#include "polarssl/md5.h"
#endif
#if defined(POLARSSL_SHA1_C)
#include "polarssl/sha1.h"
#endif
#if defined(POLARSSL_SHA2_C)
#include "polarssl/sha2.h"
#endif
#if defined(POLARSSL_SHA4_C)
#include "polarssl/sha4.h"
#endif
#include "polarssl/dhm.h"
#include <string.h>
#include <stdlib.h>
#if defined(_WIN32)
#include <windows.h>
#else
#include <time.h>
#endif
#if defined(POLARSSL_FS_IO)
#include <stdio.h>
#if !defined(_WIN32)
#include <sys/types.h>
#include <dirent.h>
#endif
#endif
/*
* Version ::= INTEGER { v1(0), v2(1), v3(2) }
*/
static int x509_get_version( unsigned char **p,
const unsigned char *end,
int *ver )
{
int ret;
size_t len;
if( ( ret = asn1_get_tag( p, end, &len,
ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 0 ) ) != 0 )
{
if( ret == POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
{
*ver = 0;
return( 0 );
}
return( ret );
}
end = *p + len;
if( ( ret = asn1_get_int( p, end, ver ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_VERSION + ret );
if( *p != end )
return( POLARSSL_ERR_X509_CERT_INVALID_VERSION +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
/*
* Version ::= INTEGER { v1(0), v2(1) }
*/
static int x509_crl_get_version( unsigned char **p,
const unsigned char *end,
int *ver )
{
int ret;
if( ( ret = asn1_get_int( p, end, ver ) ) != 0 )
{
if( ret == POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
{
*ver = 0;
return( 0 );
}
return( POLARSSL_ERR_X509_CERT_INVALID_VERSION + ret );
}
return( 0 );
}
/*
* CertificateSerialNumber ::= INTEGER
*/
static int x509_get_serial( unsigned char **p,
const unsigned char *end,
x509_buf *serial )
{
int ret;
if( ( end - *p ) < 1 )
return( POLARSSL_ERR_X509_CERT_INVALID_SERIAL +
POLARSSL_ERR_ASN1_OUT_OF_DATA );
if( **p != ( ASN1_CONTEXT_SPECIFIC | ASN1_PRIMITIVE | 2 ) &&
**p != ASN1_INTEGER )
return( POLARSSL_ERR_X509_CERT_INVALID_SERIAL +
POLARSSL_ERR_ASN1_UNEXPECTED_TAG );
serial->tag = *(*p)++;
if( ( ret = asn1_get_len( p, end, &serial->len ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_SERIAL + ret );
serial->p = *p;
*p += serial->len;
return( 0 );
}
/*
* AlgorithmIdentifier ::= SEQUENCE {
* algorithm OBJECT IDENTIFIER,
* parameters ANY DEFINED BY algorithm OPTIONAL }
*/
static int x509_get_alg( unsigned char **p,
const unsigned char *end,
x509_buf *alg )
{
int ret;
size_t len;
if( ( ret = asn1_get_tag( p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_ALG + ret );
end = *p + len;
alg->tag = **p;
if( ( ret = asn1_get_tag( p, end, &alg->len, ASN1_OID ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_ALG + ret );
alg->p = *p;
*p += alg->len;
if( *p == end )
return( 0 );
/*
* assume the algorithm parameters must be NULL
*/
if( ( ret = asn1_get_tag( p, end, &len, ASN1_NULL ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_ALG + ret );
if( *p != end )
return( POLARSSL_ERR_X509_CERT_INVALID_ALG +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
/*
* 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,
x509_name *cur )
{
int ret;
size_t len;
x509_buf *oid;
x509_buf *val;
if( ( ret = asn1_get_tag( p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_NAME + ret );
oid = &cur->oid;
oid->tag = **p;
if( ( ret = asn1_get_tag( p, end, &oid->len, ASN1_OID ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_NAME + ret );
oid->p = *p;
*p += oid->len;
if( ( end - *p ) < 1 )
return( POLARSSL_ERR_X509_CERT_INVALID_NAME +
POLARSSL_ERR_ASN1_OUT_OF_DATA );
if( **p != ASN1_BMP_STRING && **p != ASN1_UTF8_STRING &&
**p != ASN1_T61_STRING && **p != ASN1_PRINTABLE_STRING &&
**p != ASN1_IA5_STRING && **p != ASN1_UNIVERSAL_STRING )
return( POLARSSL_ERR_X509_CERT_INVALID_NAME +
POLARSSL_ERR_ASN1_UNEXPECTED_TAG );
val = &cur->val;
val->tag = *(*p)++;
if( ( ret = asn1_get_len( p, end, &val->len ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_NAME + ret );
val->p = *p;
*p += val->len;
cur->next = NULL;
return( 0 );
}
/*
* RelativeDistinguishedName ::=
* SET OF AttributeTypeAndValue
*
* AttributeTypeAndValue ::= SEQUENCE {
* type AttributeType,
* value AttributeValue }
*
* AttributeType ::= OBJECT IDENTIFIER
*
* AttributeValue ::= ANY DEFINED BY AttributeType
*/
static int x509_get_name( unsigned char **p,
const unsigned char *end,
x509_name *cur )
{
int ret;
size_t len;
const unsigned char *end2;
x509_name *use;
if( ( ret = asn1_get_tag( p, end, &len,
ASN1_CONSTRUCTED | ASN1_SET ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_NAME + ret );
end2 = end;
end = *p + len;
use = cur;
do
{
if( ( ret = x509_get_attr_type_value( p, end, use ) ) != 0 )
return( ret );
if( *p != end )
{
use->next = (x509_name *) malloc(
sizeof( x509_name ) );
if( use->next == NULL )
return( POLARSSL_ERR_X509_MALLOC_FAILED );
memset( use->next, 0, sizeof( x509_name ) );
use = use->next;
}
}
while( *p != end );
/*
* recurse until end of SEQUENCE is reached
*/
if( *p == end2 )
return( 0 );
cur->next = (x509_name *) malloc(
sizeof( x509_name ) );
if( cur->next == NULL )
return( POLARSSL_ERR_X509_MALLOC_FAILED );
memset( cur->next, 0, sizeof( x509_name ) );
return( x509_get_name( p, end2, cur->next ) );
}
/*
* Time ::= CHOICE {
* utcTime UTCTime,
* generalTime GeneralizedTime }
*/
static int x509_get_time( unsigned char **p,
const unsigned char *end,
x509_time *time )
{
int ret;
size_t len;
char date[64];
unsigned char tag;
if( ( end - *p ) < 1 )
return( POLARSSL_ERR_X509_CERT_INVALID_DATE +
POLARSSL_ERR_ASN1_OUT_OF_DATA );
tag = **p;
if ( tag == ASN1_UTC_TIME )
{
(*p)++;
ret = asn1_get_len( p, end, &len );
if( ret != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_DATE + ret );
memset( date, 0, sizeof( date ) );
memcpy( date, *p, ( len < sizeof( date ) - 1 ) ?
len : sizeof( date ) - 1 );
if( sscanf( date, "%2d%2d%2d%2d%2d%2d",
&time->year, &time->mon, &time->day,
&time->hour, &time->min, &time->sec ) < 5 )
return( POLARSSL_ERR_X509_CERT_INVALID_DATE );
time->year += 100 * ( time->year < 50 );
time->year += 1900;
*p += len;
return( 0 );
}
else if ( tag == ASN1_GENERALIZED_TIME )
{
(*p)++;
ret = asn1_get_len( p, end, &len );
if( ret != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_DATE + ret );
memset( date, 0, sizeof( date ) );
memcpy( date, *p, ( len < sizeof( date ) - 1 ) ?
len : sizeof( date ) - 1 );
if( sscanf( date, "%4d%2d%2d%2d%2d%2d",
&time->year, &time->mon, &time->day,
&time->hour, &time->min, &time->sec ) < 5 )
return( POLARSSL_ERR_X509_CERT_INVALID_DATE );
*p += len;
return( 0 );
}
else
return( POLARSSL_ERR_X509_CERT_INVALID_DATE + POLARSSL_ERR_ASN1_UNEXPECTED_TAG );
}
/*
* Validity ::= SEQUENCE {
* notBefore Time,
* notAfter Time }
*/
static int x509_get_dates( unsigned char **p,
const unsigned char *end,
x509_time *from,
x509_time *to )
{
int ret;
size_t len;
if( ( ret = asn1_get_tag( p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_DATE + ret );
end = *p + len;
if( ( ret = x509_get_time( p, end, from ) ) != 0 )
return( ret );
if( ( ret = x509_get_time( p, end, to ) ) != 0 )
return( ret );
if( *p != end )
return( POLARSSL_ERR_X509_CERT_INVALID_DATE +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
/*
* SubjectPublicKeyInfo ::= SEQUENCE {
* algorithm AlgorithmIdentifier,
* subjectPublicKey BIT STRING }
*/
static int x509_get_pubkey( unsigned char **p,
const unsigned char *end,
x509_buf *pk_alg_oid,
mpi *N, mpi *E )
{
int ret;
size_t len;
unsigned char *end2;
pk_type_t pk_alg = POLARSSL_PK_NONE;
if( ( ret = x509_get_alg( p, end, pk_alg_oid ) ) != 0 )
return( ret );
/*
* only RSA public keys handled at this time
*/
if( oid_get_pk_alg( pk_alg_oid, &pk_alg ) != 0 )
return( POLARSSL_ERR_X509_UNKNOWN_PK_ALG );
if( ( ret = asn1_get_tag( p, end, &len, ASN1_BIT_STRING ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY + ret );
if( ( end - *p ) < 1 )
return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY +
POLARSSL_ERR_ASN1_OUT_OF_DATA );
end2 = *p + len;
if( *(*p)++ != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY );
/*
* RSAPublicKey ::= SEQUENCE {
* modulus INTEGER, -- n
* publicExponent INTEGER -- e
* }
*/
if( ( ret = asn1_get_tag( p, end2, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY + ret );
if( *p + len != end2 )
return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
if( ( ret = asn1_get_mpi( p, end2, N ) ) != 0 ||
( ret = asn1_get_mpi( p, end2, E ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY + ret );
if( *p != end )
return( POLARSSL_ERR_X509_CERT_INVALID_PUBKEY +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
static int x509_get_sig( unsigned char **p,
const unsigned char *end,
x509_buf *sig )
{
int ret;
size_t len;
if( ( end - *p ) < 1 )
return( POLARSSL_ERR_X509_CERT_INVALID_SIGNATURE +
POLARSSL_ERR_ASN1_OUT_OF_DATA );
sig->tag = **p;
if( ( ret = asn1_get_tag( p, end, &len, ASN1_BIT_STRING ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_SIGNATURE + ret );
if( --len < 1 || *(*p)++ != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_SIGNATURE );
sig->len = len;
sig->p = *p;
*p += len;
return( 0 );
}
/*
* X.509 v2/v3 unique identifier (not parsed)
*/
static int x509_get_uid( unsigned char **p,
const unsigned char *end,
x509_buf *uid, int n )
{
int ret;
if( *p == end )
return( 0 );
uid->tag = **p;
if( ( ret = asn1_get_tag( p, end, &uid->len,
ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | n ) ) != 0 )
{
if( ret == POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
return( 0 );
return( ret );
}
uid->p = *p;
*p += uid->len;
return( 0 );
}
/*
* X.509 Extensions (No parsing of extensions, pointer should
* be either manually updated or extensions should be parsed!
*/
static int x509_get_ext( unsigned char **p,
const unsigned char *end,
x509_buf *ext, int tag )
{
int ret;
size_t len;
if( *p == end )
return( 0 );
ext->tag = **p;
if( ( ret = asn1_get_tag( p, end, &ext->len,
ASN1_CONTEXT_SPECIFIC | 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 = asn1_get_tag( p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS + ret );
if( end != *p + len )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
/*
* X.509 CRL v2 extensions (no extensions parsed yet.)
*/
static int x509_get_crl_ext( unsigned char **p,
const unsigned char *end,
x509_buf *ext )
{
int ret;
size_t len = 0;
/* Get explicit tag */
if( ( ret = x509_get_ext( p, end, ext, 0) ) != 0 )
{
if( ret == POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
return( 0 );
return( ret );
}
while( *p < end )
{
if( ( ret = asn1_get_tag( p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS + ret );
*p += len;
}
if( *p != end )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
/*
* X.509 CRL v2 entry extensions (no extensions parsed yet.)
*/
static int x509_get_crl_entry_ext( unsigned char **p,
const unsigned char *end,
x509_buf *ext )
{
int ret;
size_t len = 0;
/* OPTIONAL */
if (end <= *p)
return( 0 );
ext->tag = **p;
ext->p = *p;
/*
* Get CRL-entry extension sequence header
* crlEntryExtensions Extensions OPTIONAL -- if present, MUST be v2
*/
if( ( ret = asn1_get_tag( p, end, &ext->len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
{
if( ret == POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
{
ext->p = NULL;
return( 0 );
}
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS + ret );
}
end = *p + ext->len;
if( end != *p + ext->len )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
while( *p < end )
{
if( ( ret = asn1_get_tag( p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS + ret );
*p += len;
}
if( *p != end )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
static int x509_get_basic_constraints( unsigned char **p,
const unsigned char *end,
int *ca_istrue,
int *max_pathlen )
{
int ret;
size_t len;
/*
* BasicConstraints ::= SEQUENCE {
* cA BOOLEAN DEFAULT FALSE,
* pathLenConstraint INTEGER (0..MAX) OPTIONAL }
*/
*ca_istrue = 0; /* DEFAULT FALSE */
*max_pathlen = 0; /* endless */
if( ( ret = asn1_get_tag( p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS + ret );
if( *p == end )
return 0;
if( ( ret = asn1_get_bool( p, end, ca_istrue ) ) != 0 )
{
if( ret == POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
ret = asn1_get_int( p, end, ca_istrue );
if( ret != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS + ret );
if( *ca_istrue != 0 )
*ca_istrue = 1;
}
if( *p == end )
return 0;
if( ( ret = asn1_get_int( p, end, max_pathlen ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS + ret );
if( *p != end )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
(*max_pathlen)++;
return 0;
}
static int x509_get_ns_cert_type( unsigned char **p,
const unsigned char *end,
unsigned char *ns_cert_type)
{
int ret;
x509_bitstring bs = { 0, 0, NULL };
if( ( ret = asn1_get_bitstring( p, end, &bs ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS + ret );
if( bs.len != 1 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS +
POLARSSL_ERR_ASN1_INVALID_LENGTH );
/* Get actual bitstring */
*ns_cert_type = *bs.p;
return 0;
}
static int x509_get_key_usage( unsigned char **p,
const unsigned char *end,
unsigned char *key_usage)
{
int ret;
x509_bitstring bs = { 0, 0, NULL };
if( ( ret = asn1_get_bitstring( p, end, &bs ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS + ret );
if( bs.len < 1 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS +
POLARSSL_ERR_ASN1_INVALID_LENGTH );
/* Get actual bitstring */
*key_usage = *bs.p;
return 0;
}
/*
* ExtKeyUsageSyntax ::= SEQUENCE SIZE (1..MAX) OF KeyPurposeId
*
* KeyPurposeId ::= OBJECT IDENTIFIER
*/
static int x509_get_ext_key_usage( unsigned char **p,
const unsigned char *end,
x509_sequence *ext_key_usage)
{
int ret;
if( ( ret = asn1_get_sequence_of( p, end, ext_key_usage, ASN1_OID ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS + ret );
/* Sequence length must be >= 1 */
if( ext_key_usage->buf.p == NULL )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS +
POLARSSL_ERR_ASN1_INVALID_LENGTH );
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 }
*
* NOTE: PolarSSL only parses and uses dNSName at this point.
*/
static int x509_get_subject_alt_name( unsigned char **p,
const unsigned char *end,
x509_sequence *subject_alt_name )
{
int ret;
size_t len, tag_len;
asn1_buf *buf;
unsigned char tag;
asn1_sequence *cur = subject_alt_name;
/* Get main sequence tag */
if( ( ret = asn1_get_tag( p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS + ret );
if( *p + len != end )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
while( *p < end )
{
if( ( end - *p ) < 1 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS +
POLARSSL_ERR_ASN1_OUT_OF_DATA );
tag = **p;
(*p)++;
if( ( ret = asn1_get_len( p, end, &tag_len ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS + ret );
if( ( tag & ASN1_CONTEXT_SPECIFIC ) != ASN1_CONTEXT_SPECIFIC )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS +
POLARSSL_ERR_ASN1_UNEXPECTED_TAG );
if( tag != ( ASN1_CONTEXT_SPECIFIC | 2 ) )
{
*p += tag_len;
continue;
}
buf = &(cur->buf);
buf->tag = tag;
buf->p = *p;
buf->len = tag_len;
*p += buf->len;
/* Allocate and assign next pointer */
if (*p < end)
{
cur->next = (asn1_sequence *) malloc(
sizeof( asn1_sequence ) );
if( cur->next == NULL )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS +
POLARSSL_ERR_ASN1_MALLOC_FAILED );
memset( cur->next, 0, sizeof( asn1_sequence ) );
cur = cur->next;
}
}
/* Set final sequence entry's next pointer to NULL */
cur->next = NULL;
if( *p != end )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
/*
* X.509 v3 extensions
*
* TODO: Perform all of the basic constraints tests required by the RFC
* TODO: Set values for undetected extensions to a sane default?
*
*/
static int x509_get_crt_ext( unsigned char **p,
const unsigned char *end,
x509_cert *crt )
{
int ret;
size_t len;
unsigned char *end_ext_data, *end_ext_octet;
if( ( ret = x509_get_ext( p, end, &crt->v3_ext, 3 ) ) != 0 )
{
if( ret == POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
return( 0 );
return( ret );
}
while( *p < end )
{
/*
* Extension ::= SEQUENCE {
* extnID OBJECT IDENTIFIER,
* critical BOOLEAN DEFAULT FALSE,
* extnValue OCTET STRING }
*/
x509_buf extn_oid = {0, 0, NULL};
int is_critical = 0; /* DEFAULT FALSE */
int ext_type = 0;
if( ( ret = asn1_get_tag( p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS + ret );
end_ext_data = *p + len;
/* Get extension ID */
extn_oid.tag = **p;
if( ( ret = asn1_get_tag( p, end, &extn_oid.len, ASN1_OID ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS + ret );
extn_oid.p = *p;
*p += extn_oid.len;
if( ( end - *p ) < 1 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS +
POLARSSL_ERR_ASN1_OUT_OF_DATA );
/* Get optional critical */
if( ( ret = asn1_get_bool( p, end_ext_data, &is_critical ) ) != 0 &&
( ret != POLARSSL_ERR_ASN1_UNEXPECTED_TAG ) )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS + ret );
/* Data should be octet string type */
if( ( ret = asn1_get_tag( p, end_ext_data, &len,
ASN1_OCTET_STRING ) ) != 0 )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS + ret );
end_ext_octet = *p + len;
if( end_ext_octet != end_ext_data )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
/*
* Detect supported extensions
*/
ret = oid_get_x509_ext_type( &extn_oid, &ext_type );
if( ret != 0 )
{
/* No parser found, skip extension */
*p = end_ext_octet;
#if !defined(POLARSSL_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION)
if( is_critical )
{
/* Data is marked as critical: fail */
return ( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS +
POLARSSL_ERR_ASN1_UNEXPECTED_TAG );
}
#endif
continue;
}
crt->ext_types |= ext_type;
switch( ext_type )
{
case EXT_BASIC_CONSTRAINTS:
/* Parse basic constraints */
if( ( ret = x509_get_basic_constraints( p, end_ext_octet,
&crt->ca_istrue, &crt->max_pathlen ) ) != 0 )
return ( ret );
break;
case EXT_KEY_USAGE:
/* Parse key usage */
if( ( ret = x509_get_key_usage( p, end_ext_octet,
&crt->key_usage ) ) != 0 )
return ( ret );
break;
case EXT_EXTENDED_KEY_USAGE:
/* Parse extended key usage */
if( ( ret = x509_get_ext_key_usage( p, end_ext_octet,
&crt->ext_key_usage ) ) != 0 )
return ( ret );
break;
case EXT_SUBJECT_ALT_NAME:
/* Parse subject alt name */
if( ( ret = x509_get_subject_alt_name( p, end_ext_octet,
&crt->subject_alt_names ) ) != 0 )
return ( ret );
break;
case EXT_NS_CERT_TYPE:
/* Parse netscape certificate type */
if( ( ret = x509_get_ns_cert_type( p, end_ext_octet,
&crt->ns_cert_type ) ) != 0 )
return ( ret );
break;
default:
return( POLARSSL_ERR_X509_FEATURE_UNAVAILABLE );
}
}
if( *p != end )
return( POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
/*
* X.509 CRL Entries
*/
static int x509_get_entries( unsigned char **p,
const unsigned char *end,
x509_crl_entry *entry )
{
int ret;
size_t entry_len;
x509_crl_entry *cur_entry = entry;
if( *p == end )
return( 0 );
if( ( ret = asn1_get_tag( p, end, &entry_len,
ASN1_SEQUENCE | ASN1_CONSTRUCTED ) ) != 0 )
{
if( ret == POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
return( 0 );
return( ret );
}
end = *p + entry_len;
while( *p < end )
{
size_t len2;
const unsigned char *end2;
if( ( ret = asn1_get_tag( p, end, &len2,
ASN1_SEQUENCE | ASN1_CONSTRUCTED ) ) != 0 )
{
return( ret );
}
cur_entry->raw.tag = **p;
cur_entry->raw.p = *p;
cur_entry->raw.len = len2;
end2 = *p + len2;
if( ( ret = x509_get_serial( p, end2, &cur_entry->serial ) ) != 0 )
return( ret );
if( ( ret = x509_get_time( p, end2, &cur_entry->revocation_date ) ) != 0 )
return( ret );
if( ( ret = x509_get_crl_entry_ext( p, end2, &cur_entry->entry_ext ) ) != 0 )
return( ret );
if ( *p < end )
{
cur_entry->next = malloc( sizeof( x509_crl_entry ) );
if( cur_entry->next == NULL )
return( POLARSSL_ERR_X509_MALLOC_FAILED );
cur_entry = cur_entry->next;
memset( cur_entry, 0, sizeof( x509_crl_entry ) );
}
}
return( 0 );
}
static int x509_get_sig_alg( const x509_buf *sig_oid, md_type_t *md_alg,
pk_type_t *pk_alg )
{
int ret = oid_get_sig_alg( sig_oid, md_alg, pk_alg );
if( ret != 0 )
return( POLARSSL_ERR_X509_CERT_UNKNOWN_SIG_ALG + ret );
return( 0 );
}
/*
* Parse and fill a single X.509 certificate in DER format
*/
int x509parse_crt_der( x509_cert *crt, const unsigned char *buf, size_t buflen )
{
int ret;
size_t len;
unsigned char *p, *end, *crt_end;
/*
* Check for valid input
*/
if( crt == NULL || buf == NULL )
return( POLARSSL_ERR_X509_INVALID_INPUT );
p = (unsigned char *) malloc( len = buflen );
if( p == NULL )
return( POLARSSL_ERR_X509_MALLOC_FAILED );
memcpy( p, buf, buflen );
buflen = 0;
crt->raw.p = p;
crt->raw.len = len;
end = p + len;
/*
* Certificate ::= SEQUENCE {
* tbsCertificate TBSCertificate,
* signatureAlgorithm AlgorithmIdentifier,
* signatureValue BIT STRING }
*/
if( ( ret = asn1_get_tag( &p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
{
x509_free( crt );
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT );
}
if( len > (size_t) ( end - p ) )
{
x509_free( crt );
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
}
crt_end = p + len;
/*
* TBSCertificate ::= SEQUENCE {
*/
crt->tbs.p = p;
if( ( ret = asn1_get_tag( &p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
{
x509_free( crt );
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT + ret );
}
end = p + len;
crt->tbs.len = end - crt->tbs.p;
/*
* Version ::= INTEGER { v1(0), v2(1), v3(2) }
*
* CertificateSerialNumber ::= INTEGER
*
* signature AlgorithmIdentifier
*/
if( ( ret = x509_get_version( &p, end, &crt->version ) ) != 0 ||
( ret = x509_get_serial( &p, end, &crt->serial ) ) != 0 ||
( ret = x509_get_alg( &p, end, &crt->sig_oid1 ) ) != 0 )
{
x509_free( crt );
return( ret );
}
crt->version++;
if( crt->version > 3 )
{
x509_free( crt );
return( POLARSSL_ERR_X509_CERT_UNKNOWN_VERSION );
}
if( ( ret = x509_get_sig_alg( &crt->sig_oid1, &crt->sig_md,
&crt->sig_pk ) ) != 0 )
{
x509_free( crt );
return( ret );
}
/*
* issuer Name
*/
crt->issuer_raw.p = p;
if( ( ret = asn1_get_tag( &p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
{
x509_free( crt );
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT + ret );
}
if( ( ret = x509_get_name( &p, p + len, &crt->issuer ) ) != 0 )
{
x509_free( crt );
return( ret );
}
crt->issuer_raw.len = p - crt->issuer_raw.p;
/*
* Validity ::= SEQUENCE {
* notBefore Time,
* notAfter Time }
*
*/
if( ( ret = x509_get_dates( &p, end, &crt->valid_from,
&crt->valid_to ) ) != 0 )
{
x509_free( crt );
return( ret );
}
/*
* subject Name
*/
crt->subject_raw.p = p;
if( ( ret = asn1_get_tag( &p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
{
x509_free( crt );
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT + ret );
}
if( len && ( ret = x509_get_name( &p, p + len, &crt->subject ) ) != 0 )
{
x509_free( crt );
return( ret );
}
crt->subject_raw.len = p - crt->subject_raw.p;
/*
* SubjectPublicKeyInfo ::= SEQUENCE
* algorithm AlgorithmIdentifier,
* subjectPublicKey BIT STRING }
*/
if( ( ret = asn1_get_tag( &p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
{
x509_free( crt );
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT + ret );
}
if( ( ret = x509_get_pubkey( &p, p + len, &crt->pk_oid,
&crt->rsa.N, &crt->rsa.E ) ) != 0 )
{
x509_free( crt );
return( ret );
}
if( ( ret = rsa_check_pubkey( &crt->rsa ) ) != 0 )
{
x509_free( crt );
return( ret );
}
crt->rsa.len = mpi_size( &crt->rsa.N );
/*
* issuerUniqueID [1] IMPLICIT UniqueIdentifier OPTIONAL,
* -- If present, version shall be v2 or v3
* subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL,
* -- If present, version shall be v2 or v3
* extensions [3] EXPLICIT Extensions OPTIONAL
* -- If present, version shall be v3
*/
if( crt->version == 2 || crt->version == 3 )
{
ret = x509_get_uid( &p, end, &crt->issuer_id, 1 );
if( ret != 0 )
{
x509_free( crt );
return( ret );
}
}
if( crt->version == 2 || crt->version == 3 )
{
ret = x509_get_uid( &p, end, &crt->subject_id, 2 );
if( ret != 0 )
{
x509_free( crt );
return( ret );
}
}
if( crt->version == 3 )
{
ret = x509_get_crt_ext( &p, end, crt);
if( ret != 0 )
{
x509_free( crt );
return( ret );
}
}
if( p != end )
{
x509_free( crt );
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
}
end = crt_end;
/*
* signatureAlgorithm AlgorithmIdentifier,
* signatureValue BIT STRING
*/
if( ( ret = x509_get_alg( &p, end, &crt->sig_oid2 ) ) != 0 )
{
x509_free( crt );
return( ret );
}
if( crt->sig_oid1.len != crt->sig_oid2.len ||
memcmp( crt->sig_oid1.p, crt->sig_oid2.p, crt->sig_oid1.len ) != 0 )
{
x509_free( crt );
return( POLARSSL_ERR_X509_CERT_SIG_MISMATCH );
}
if( ( ret = x509_get_sig( &p, end, &crt->sig ) ) != 0 )
{
x509_free( crt );
return( ret );
}
if( p != end )
{
x509_free( crt );
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
}
return( 0 );
}
/*
* Parse one or more PEM certificates from a buffer and add them to the chained list
*/
int x509parse_crt( x509_cert *chain, const unsigned char *buf, size_t buflen )
{
int ret, success = 0, first_error = 0, total_failed = 0;
x509_cert *crt, *prev = NULL;
int buf_format = X509_FORMAT_DER;
crt = chain;
/*
* Check for valid input
*/
if( crt == NULL || buf == NULL )
return( POLARSSL_ERR_X509_INVALID_INPUT );
while( crt->version != 0 && crt->next != NULL )
{
prev = crt;
crt = crt->next;
}
/*
* Add new certificate on the end of the chain if needed.
*/
if ( crt->version != 0 && crt->next == NULL)
{
crt->next = (x509_cert *) malloc( sizeof( x509_cert ) );
if( crt->next == NULL )
return( POLARSSL_ERR_X509_MALLOC_FAILED );
prev = crt;
crt = crt->next;
memset( crt, 0, sizeof( x509_cert ) );
}
/*
* Determine buffer content. Buffer contains either one DER certificate or
* one or more PEM certificates.
*/
#if defined(POLARSSL_PEM_C)
if( strstr( (char *) buf, "-----BEGIN CERTIFICATE-----" ) != NULL )
buf_format = X509_FORMAT_PEM;
#endif
if( buf_format == X509_FORMAT_DER )
return x509parse_crt_der( crt, buf, buflen );
#if defined(POLARSSL_PEM_C)
if( buf_format == X509_FORMAT_PEM )
{
pem_context pem;
while( buflen > 0 )
{
size_t use_len;
pem_init( &pem );
ret = pem_read_buffer( &pem,
"-----BEGIN CERTIFICATE-----",
"-----END CERTIFICATE-----",
buf, NULL, 0, &use_len );
if( ret == 0 )
{
/*
* Was PEM encoded
*/
buflen -= use_len;
buf += use_len;
}
else if( ret != POLARSSL_ERR_PEM_NO_HEADER_PRESENT )
{
pem_free( &pem );
if( first_error == 0 )
first_error = ret;
continue;
}
else
break;
ret = x509parse_crt_der( crt, pem.buf, pem.buflen );
pem_free( &pem );
if( ret != 0 )
{
/*
* quit parsing on a memory error
*/
if( ret == POLARSSL_ERR_X509_MALLOC_FAILED )
{
if( prev )
prev->next = NULL;
if( crt != chain )
free( crt );
return( ret );
}
if( first_error == 0 )
first_error = ret;
total_failed++;
memset( crt, 0, sizeof( x509_cert ) );
continue;
}
success = 1;
/*
* Add new certificate to the list
*/
crt->next = (x509_cert *) malloc( sizeof( x509_cert ) );
if( crt->next == NULL )
return( POLARSSL_ERR_X509_MALLOC_FAILED );
prev = crt;
crt = crt->next;
memset( crt, 0, sizeof( x509_cert ) );
}
}
#endif
if( crt->version == 0 )
{
if( prev )
prev->next = NULL;
if( crt != chain )
free( crt );
}
if( success )
return( total_failed );
else if( first_error )
return( first_error );
else
return( POLARSSL_ERR_X509_CERT_UNKNOWN_FORMAT );
}
/*
* Parse one or more CRLs and add them to the chained list
*/
int x509parse_crl( x509_crl *chain, const unsigned char *buf, size_t buflen )
{
int ret;
size_t len;
unsigned char *p, *end;
x509_crl *crl;
#if defined(POLARSSL_PEM_C)
size_t use_len;
pem_context pem;
#endif
crl = chain;
/*
* Check for valid input
*/
if( crl == NULL || buf == NULL )
return( POLARSSL_ERR_X509_INVALID_INPUT );
while( crl->version != 0 && crl->next != NULL )
crl = crl->next;
/*
* Add new CRL on the end of the chain if needed.
*/
if ( crl->version != 0 && crl->next == NULL)
{
crl->next = (x509_crl *) malloc( sizeof( x509_crl ) );
if( crl->next == NULL )
{
x509_crl_free( crl );
return( POLARSSL_ERR_X509_MALLOC_FAILED );
}
crl = crl->next;
memset( crl, 0, sizeof( x509_crl ) );
}
#if defined(POLARSSL_PEM_C)
pem_init( &pem );
ret = pem_read_buffer( &pem,
"-----BEGIN X509 CRL-----",
"-----END X509 CRL-----",
buf, NULL, 0, &use_len );
if( ret == 0 )
{
/*
* Was PEM encoded
*/
buflen -= use_len;
buf += use_len;
/*
* Steal PEM buffer
*/
p = pem.buf;
pem.buf = NULL;
len = pem.buflen;
pem_free( &pem );
}
else if( ret != POLARSSL_ERR_PEM_NO_HEADER_PRESENT )
{
pem_free( &pem );
return( ret );
}
else
{
/*
* nope, copy the raw DER data
*/
p = (unsigned char *) malloc( len = buflen );
if( p == NULL )
return( POLARSSL_ERR_X509_MALLOC_FAILED );
memcpy( p, buf, buflen );
buflen = 0;
}
#else
p = (unsigned char *) malloc( len = buflen );
if( p == NULL )
return( POLARSSL_ERR_X509_MALLOC_FAILED );
memcpy( p, buf, buflen );
buflen = 0;
#endif
crl->raw.p = p;
crl->raw.len = len;
end = p + len;
/*
* CertificateList ::= SEQUENCE {
* tbsCertList TBSCertList,
* signatureAlgorithm AlgorithmIdentifier,
* signatureValue BIT STRING }
*/
if( ( ret = asn1_get_tag( &p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
{
x509_crl_free( crl );
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT );
}
if( len != (size_t) ( end - p ) )
{
x509_crl_free( crl );
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
}
/*
* TBSCertList ::= SEQUENCE {
*/
crl->tbs.p = p;
if( ( ret = asn1_get_tag( &p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
{
x509_crl_free( crl );
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT + ret );
}
end = p + len;
crl->tbs.len = end - crl->tbs.p;
/*
* Version ::= INTEGER OPTIONAL { v1(0), v2(1) }
* -- if present, MUST be v2
*
* signature AlgorithmIdentifier
*/
if( ( ret = x509_crl_get_version( &p, end, &crl->version ) ) != 0 ||
( ret = x509_get_alg( &p, end, &crl->sig_oid1 ) ) != 0 )
{
x509_crl_free( crl );
return( ret );
}
crl->version++;
if( crl->version > 2 )
{
x509_crl_free( crl );
return( POLARSSL_ERR_X509_CERT_UNKNOWN_VERSION );
}
if( ( ret = x509_get_sig_alg( &crl->sig_oid1, &crl->sig_md,
&crl->sig_pk ) ) != 0 )
{
x509_crl_free( crl );
return( POLARSSL_ERR_X509_CERT_UNKNOWN_SIG_ALG );
}
/*
* issuer Name
*/
crl->issuer_raw.p = p;
if( ( ret = asn1_get_tag( &p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
{
x509_crl_free( crl );
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT + ret );
}
if( ( ret = x509_get_name( &p, p + len, &crl->issuer ) ) != 0 )
{
x509_crl_free( crl );
return( ret );
}
crl->issuer_raw.len = p - crl->issuer_raw.p;
/*
* thisUpdate Time
* nextUpdate Time OPTIONAL
*/
if( ( ret = x509_get_time( &p, end, &crl->this_update ) ) != 0 )
{
x509_crl_free( crl );
return( ret );
}
if( ( ret = x509_get_time( &p, end, &crl->next_update ) ) != 0 )
{
if ( ret != ( POLARSSL_ERR_X509_CERT_INVALID_DATE +
POLARSSL_ERR_ASN1_UNEXPECTED_TAG ) &&
ret != ( POLARSSL_ERR_X509_CERT_INVALID_DATE +
POLARSSL_ERR_ASN1_OUT_OF_DATA ) )
{
x509_crl_free( crl );
return( ret );
}
}
/*
* revokedCertificates SEQUENCE OF SEQUENCE {
* userCertificate CertificateSerialNumber,
* revocationDate Time,
* crlEntryExtensions Extensions OPTIONAL
* -- if present, MUST be v2
* } OPTIONAL
*/
if( ( ret = x509_get_entries( &p, end, &crl->entry ) ) != 0 )
{
x509_crl_free( crl );
return( ret );
}
/*
* crlExtensions EXPLICIT Extensions OPTIONAL
* -- if present, MUST be v2
*/
if( crl->version == 2 )
{
ret = x509_get_crl_ext( &p, end, &crl->crl_ext );
if( ret != 0 )
{
x509_crl_free( crl );
return( ret );
}
}
if( p != end )
{
x509_crl_free( crl );
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
}
end = crl->raw.p + crl->raw.len;
/*
* signatureAlgorithm AlgorithmIdentifier,
* signatureValue BIT STRING
*/
if( ( ret = x509_get_alg( &p, end, &crl->sig_oid2 ) ) != 0 )
{
x509_crl_free( crl );
return( ret );
}
if( crl->sig_oid1.len != crl->sig_oid2.len ||
memcmp( crl->sig_oid1.p, crl->sig_oid2.p, crl->sig_oid1.len ) != 0 )
{
x509_crl_free( crl );
return( POLARSSL_ERR_X509_CERT_SIG_MISMATCH );
}
if( ( ret = x509_get_sig( &p, end, &crl->sig ) ) != 0 )
{
x509_crl_free( crl );
return( ret );
}
if( p != end )
{
x509_crl_free( crl );
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
}
if( buflen > 0 )
{
crl->next = (x509_crl *) malloc( sizeof( x509_crl ) );
if( crl->next == NULL )
{
x509_crl_free( crl );
return( POLARSSL_ERR_X509_MALLOC_FAILED );
}
crl = crl->next;
memset( crl, 0, sizeof( x509_crl ) );
return( x509parse_crl( crl, buf, buflen ) );
}
return( 0 );
}
#if defined(POLARSSL_FS_IO)
/*
* Load all data from a file into a given buffer.
*/
int load_file( const char *path, unsigned char **buf, size_t *n )
{
FILE *f;
if( ( f = fopen( path, "rb" ) ) == NULL )
return( POLARSSL_ERR_X509_FILE_IO_ERROR );
fseek( f, 0, SEEK_END );
*n = (size_t) ftell( f );
fseek( f, 0, SEEK_SET );
if( ( *buf = (unsigned char *) malloc( *n + 1 ) ) == NULL )
return( POLARSSL_ERR_X509_MALLOC_FAILED );
if( fread( *buf, 1, *n, f ) != *n )
{
fclose( f );
free( *buf );
return( POLARSSL_ERR_X509_FILE_IO_ERROR );
}
fclose( f );
(*buf)[*n] = '\0';
return( 0 );
}
/*
* Load one or more certificates and add them to the chained list
*/
int x509parse_crtfile( x509_cert *chain, const char *path )
{
int ret;
size_t n;
unsigned char *buf;
if ( (ret = load_file( path, &buf, &n ) ) != 0 )
return( ret );
ret = x509parse_crt( chain, buf, n );
memset( buf, 0, n + 1 );
free( buf );
return( ret );
}
int x509parse_crtpath( x509_cert *chain, const char *path )
{
int ret = 0;
#if defined(_WIN32)
int w_ret;
WCHAR szDir[MAX_PATH];
char filename[MAX_PATH];
char *p;
int len = strlen( path );
WIN32_FIND_DATAW file_data;
HANDLE hFind;
if( len > MAX_PATH - 3 )
return( POLARSSL_ERR_X509_INVALID_INPUT );
memset( szDir, 0, sizeof(szDir) );
memset( filename, 0, MAX_PATH );
memcpy( filename, path, len );
filename[len++] = '\\';
p = filename + len;
filename[len++] = '*';
w_ret = MultiByteToWideChar( CP_ACP, 0, path, len, szDir, MAX_PATH - 3 );
hFind = FindFirstFileW( szDir, &file_data );
if (hFind == INVALID_HANDLE_VALUE)
return( POLARSSL_ERR_X509_FILE_IO_ERROR );
len = MAX_PATH - len;
do
{
memset( p, 0, len );
if( file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY )
continue;
w_ret = WideCharToMultiByte( CP_ACP, 0, file_data.cFileName,
lstrlenW(file_data.cFileName),
p, len - 1,
NULL, NULL );
w_ret = x509parse_crtfile( chain, filename );
if( w_ret < 0 )
{
ret = w_ret;
goto cleanup;
}
ret += w_ret;
}
while( FindNextFileW( hFind, &file_data ) != 0 );
if (GetLastError() != ERROR_NO_MORE_FILES)
ret = POLARSSL_ERR_X509_FILE_IO_ERROR;
cleanup:
FindClose( hFind );
#else
int t_ret;
struct dirent *entry;
char entry_name[255];
DIR *dir = opendir( path );
if( dir == NULL)
return( POLARSSL_ERR_X509_FILE_IO_ERROR );
while( ( entry = readdir( dir ) ) != NULL )
{
if( entry->d_type != DT_REG )
continue;
snprintf( entry_name, sizeof(entry_name), "%s/%s", path, entry->d_name );
t_ret = x509parse_crtfile( chain, entry_name );
if( t_ret < 0 )
{
ret = t_ret;
break;
}
ret += t_ret;
}
closedir( dir );
#endif
return( ret );
}
/*
* Load one or more CRLs and add them to the chained list
*/
int x509parse_crlfile( x509_crl *chain, const char *path )
{
int ret;
size_t n;
unsigned char *buf;
if ( (ret = load_file( path, &buf, &n ) ) != 0 )
return( ret );
ret = x509parse_crl( chain, buf, n );
memset( buf, 0, n + 1 );
free( buf );
return( ret );
}
/*
* Load and parse a private RSA key
*/
int x509parse_keyfile( rsa_context *rsa, const char *path, const char *pwd )
{
int ret;
size_t n;
unsigned char *buf;
if ( (ret = load_file( path, &buf, &n ) ) != 0 )
return( ret );
if( pwd == NULL )
ret = x509parse_key( rsa, buf, n, NULL, 0 );
else
ret = x509parse_key( rsa, buf, n,
(unsigned char *) pwd, strlen( pwd ) );
memset( buf, 0, n + 1 );
free( buf );
return( ret );
}
/*
* Load and parse a public RSA key
*/
int x509parse_public_keyfile( rsa_context *rsa, const char *path )
{
int ret;
size_t n;
unsigned char *buf;
if ( (ret = load_file( path, &buf, &n ) ) != 0 )
return( ret );
ret = x509parse_public_key( rsa, buf, n );
memset( buf, 0, n + 1 );
free( buf );
return( ret );
}
#endif /* POLARSSL_FS_IO */
/*
* Parse a private RSA key
*/
int x509parse_key( rsa_context *rsa, const unsigned char *key, size_t keylen,
const unsigned char *pwd, size_t pwdlen )
{
int ret;
size_t len;
unsigned char *p, *end;
unsigned char *p_alt;
x509_buf pk_alg_oid;
#if defined(POLARSSL_PEM_C)
pem_context pem;
pem_init( &pem );
ret = pem_read_buffer( &pem,
"-----BEGIN RSA PRIVATE KEY-----",
"-----END RSA PRIVATE KEY-----",
key, pwd, pwdlen, &len );
if( ret == POLARSSL_ERR_PEM_NO_HEADER_PRESENT )
{
ret = pem_read_buffer( &pem,
"-----BEGIN PRIVATE KEY-----",
"-----END PRIVATE KEY-----",
key, pwd, pwdlen, &len );
}
if( ret == 0 )
{
/*
* Was PEM encoded
*/
keylen = pem.buflen;
}
else if( ret != POLARSSL_ERR_PEM_NO_HEADER_PRESENT )
{
pem_free( &pem );
return( ret );
}
p = ( ret == 0 ) ? pem.buf : (unsigned char *) key;
#else
((void) pwd);
((void) pwdlen);
p = (unsigned char *) key;
#endif
end = p + keylen;
/*
* Note: Depending on the type of private key file one can expect either a
* PrivatKeyInfo object (PKCS#8) or a RSAPrivateKey (PKCS#1) directly.
*
* PrivateKeyInfo ::= SEQUENCE {
* version Version,
* algorithm AlgorithmIdentifier,
* PrivateKey BIT STRING
* }
*
* AlgorithmIdentifier ::= SEQUENCE {
* algorithm OBJECT IDENTIFIER,
* parameters ANY DEFINED BY algorithm OPTIONAL
* }
*
* RSAPrivateKey ::= SEQUENCE {
* version Version,
* modulus INTEGER, -- n
* publicExponent INTEGER, -- e
* privateExponent INTEGER, -- d
* prime1 INTEGER, -- p
* prime2 INTEGER, -- q
* exponent1 INTEGER, -- d mod (p-1)
* exponent2 INTEGER, -- d mod (q-1)
* coefficient INTEGER, -- (inverse of q) mod p
* otherPrimeInfos OtherPrimeInfos OPTIONAL
* }
*/
if( ( ret = asn1_get_tag( &p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
{
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
rsa_free( rsa );
return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT + ret );
}
end = p + len;
if( ( ret = asn1_get_int( &p, end, &rsa->ver ) ) != 0 )
{
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
rsa_free( rsa );
return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT + ret );
}
if( rsa->ver != 0 )
{
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
rsa_free( rsa );
return( POLARSSL_ERR_X509_KEY_INVALID_VERSION + ret );
}
p_alt = p;
if( ( ret = x509_get_alg( &p_alt, end, &pk_alg_oid ) ) != 0 )
{
// Assume that we have the PKCS#1 format if wrong
// tag was encountered
//
if( ret != POLARSSL_ERR_X509_CERT_INVALID_ALG +
POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
{
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
rsa_free( rsa );
return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT );
}
}
else
{
pk_type_t pk_alg = POLARSSL_PK_NONE;
/*
* only RSA keys handled at this time
*/
if( oid_get_pk_alg( &pk_alg_oid, &pk_alg ) != 0 )
return( POLARSSL_ERR_X509_UNKNOWN_PK_ALG );
/*
* Parse the PKCS#8 format
*/
p = p_alt;
if( ( ret = asn1_get_tag( &p, end, &len, ASN1_OCTET_STRING ) ) != 0 )
{
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
rsa_free( rsa );
return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT + ret );
}
if( ( end - p ) < 1 )
{
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
rsa_free( rsa );
return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT +
POLARSSL_ERR_ASN1_OUT_OF_DATA );
}
end = p + len;
if( ( ret = asn1_get_tag( &p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
{
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
rsa_free( rsa );
return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT + ret );
}
end = p + len;
if( ( ret = asn1_get_int( &p, end, &rsa->ver ) ) != 0 )
{
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
rsa_free( rsa );
return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT + ret );
}
if( rsa->ver != 0 )
{
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
rsa_free( rsa );
return( POLARSSL_ERR_X509_KEY_INVALID_VERSION + ret );
}
}
if( ( ret = asn1_get_mpi( &p, end, &rsa->N ) ) != 0 ||
( ret = asn1_get_mpi( &p, end, &rsa->E ) ) != 0 ||
( ret = asn1_get_mpi( &p, end, &rsa->D ) ) != 0 ||
( ret = asn1_get_mpi( &p, end, &rsa->P ) ) != 0 ||
( ret = asn1_get_mpi( &p, end, &rsa->Q ) ) != 0 ||
( ret = asn1_get_mpi( &p, end, &rsa->DP ) ) != 0 ||
( ret = asn1_get_mpi( &p, end, &rsa->DQ ) ) != 0 ||
( ret = asn1_get_mpi( &p, end, &rsa->QP ) ) != 0 )
{
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
rsa_free( rsa );
return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT + ret );
}
rsa->len = mpi_size( &rsa->N );
if( p != end )
{
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
rsa_free( rsa );
return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
}
if( ( ret = rsa_check_privkey( rsa ) ) != 0 )
{
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
rsa_free( rsa );
return( ret );
}
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
return( 0 );
}
/*
* Parse a public RSA key
*/
int x509parse_public_key( rsa_context *rsa, const unsigned char *key, size_t keylen )
{
int ret;
size_t len;
unsigned char *p, *end;
x509_buf alg_oid;
#if defined(POLARSSL_PEM_C)
pem_context pem;
pem_init( &pem );
ret = pem_read_buffer( &pem,
"-----BEGIN PUBLIC KEY-----",
"-----END PUBLIC KEY-----",
key, NULL, 0, &len );
if( ret == 0 )
{
/*
* Was PEM encoded
*/
keylen = pem.buflen;
}
else if( ret != POLARSSL_ERR_PEM_NO_HEADER_PRESENT )
{
pem_free( &pem );
return( ret );
}
p = ( ret == 0 ) ? pem.buf : (unsigned char *) key;
#else
p = (unsigned char *) key;
#endif
end = p + keylen;
/*
* PublicKeyInfo ::= SEQUENCE {
* algorithm AlgorithmIdentifier,
* PublicKey BIT STRING
* }
*
* AlgorithmIdentifier ::= SEQUENCE {
* algorithm OBJECT IDENTIFIER,
* parameters ANY DEFINED BY algorithm OPTIONAL
* }
*
* RSAPublicKey ::= SEQUENCE {
* modulus INTEGER, -- n
* publicExponent INTEGER -- e
* }
*/
if( ( ret = asn1_get_tag( &p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
{
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
rsa_free( rsa );
return( POLARSSL_ERR_X509_CERT_INVALID_FORMAT + ret );
}
if( ( ret = x509_get_pubkey( &p, end, &alg_oid, &rsa->N, &rsa->E ) ) != 0 )
{
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
rsa_free( rsa );
return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT + ret );
}
if( ( ret = rsa_check_pubkey( rsa ) ) != 0 )
{
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
rsa_free( rsa );
return( ret );
}
rsa->len = mpi_size( &rsa->N );
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
return( 0 );
}
#if defined(POLARSSL_DHM_C)
/*
* Parse DHM parameters
*/
int x509parse_dhm( dhm_context *dhm, const unsigned char *dhmin, size_t dhminlen )
{
int ret;
size_t len;
unsigned char *p, *end;
#if defined(POLARSSL_PEM_C)
pem_context pem;
pem_init( &pem );
ret = pem_read_buffer( &pem,
"-----BEGIN DH PARAMETERS-----",
"-----END DH PARAMETERS-----",
dhmin, NULL, 0, &dhminlen );
if( ret == 0 )
{
/*
* Was PEM encoded
*/
dhminlen = pem.buflen;
}
else if( ret != POLARSSL_ERR_PEM_NO_HEADER_PRESENT )
{
pem_free( &pem );
return( ret );
}
p = ( ret == 0 ) ? pem.buf : (unsigned char *) dhmin;
#else
p = (unsigned char *) dhmin;
#endif
end = p + dhminlen;
memset( dhm, 0, sizeof( dhm_context ) );
/*
* DHParams ::= SEQUENCE {
* prime INTEGER, -- P
* generator INTEGER, -- g
* }
*/
if( ( ret = asn1_get_tag( &p, end, &len,
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
{
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT + ret );
}
end = p + len;
if( ( ret = asn1_get_mpi( &p, end, &dhm->P ) ) != 0 ||
( ret = asn1_get_mpi( &p, end, &dhm->G ) ) != 0 )
{
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
dhm_free( dhm );
return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT + ret );
}
if( p != end )
{
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
dhm_free( dhm );
return( POLARSSL_ERR_X509_KEY_INVALID_FORMAT +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
}
#if defined(POLARSSL_PEM_C)
pem_free( &pem );
#endif
return( 0 );
}
#if defined(POLARSSL_FS_IO)
/*
* Load and parse a private RSA key
*/
int x509parse_dhmfile( dhm_context *dhm, const char *path )
{
int ret;
size_t n;
unsigned char *buf;
if ( ( ret = load_file( path, &buf, &n ) ) != 0 )
return( ret );
ret = x509parse_dhm( dhm, buf, n );
memset( buf, 0, n + 1 );
free( buf );
return( ret );
}
#endif /* POLARSSL_FS_IO */
#endif /* POLARSSL_DHM_C */
#if defined _MSC_VER && !defined snprintf
#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
#define POLARSSL_ERR_DEBUG_BUF_TOO_SMALL -2
#define SAFE_SNPRINTF() \
{ \
if( ret == -1 ) \
return( -1 ); \
\
if ( (unsigned int) ret > n ) { \
p[n - 1] = '\0'; \
return POLARSSL_ERR_DEBUG_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 x509parse_dn_gets( char *buf, size_t size, const x509_name *dn )
{
int ret;
size_t i, n;
unsigned char c;
const x509_name *name;
const char *short_name = NULL;
char s[128], *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 = snprintf( p, n, ", " );
SAFE_SNPRINTF();
}
ret = oid_get_attr_short_name( &name->oid, &short_name );
if( ret == 0 )
ret = snprintf( p, n, "%s=", short_name );
else
ret = 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 = snprintf( p, n, "%s", s );
SAFE_SNPRINTF();
name = name->next;
}
return( (int) ( size - n ) );
}
/*
* Store the serial in printable form into buf; no more
* than size characters will be written
*/
int x509parse_serial_gets( char *buf, size_t size, const 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 = snprintf( p, n, "%02X%s",
serial->p[i], ( i < nr - 1 ) ? ":" : "" );
SAFE_SNPRINTF();
}
if( nr != serial->len )
{
ret = snprintf( p, n, "...." );
SAFE_SNPRINTF();
}
return( (int) ( size - n ) );
}
/*
* Return an informational string about the certificate.
*/
int x509parse_cert_info( char *buf, size_t size, const char *prefix,
const x509_cert *crt )
{
int ret;
size_t n;
char *p;
const char *desc = NULL;
p = buf;
n = size;
ret = snprintf( p, n, "%scert. version : %d\n",
prefix, crt->version );
SAFE_SNPRINTF();
ret = snprintf( p, n, "%sserial number : ",
prefix );
SAFE_SNPRINTF();
ret = x509parse_serial_gets( p, n, &crt->serial);
SAFE_SNPRINTF();
ret = snprintf( p, n, "\n%sissuer name : ", prefix );
SAFE_SNPRINTF();
ret = x509parse_dn_gets( p, n, &crt->issuer );
SAFE_SNPRINTF();
ret = snprintf( p, n, "\n%ssubject name : ", prefix );
SAFE_SNPRINTF();
ret = x509parse_dn_gets( p, n, &crt->subject );
SAFE_SNPRINTF();
ret = snprintf( p, n, "\n%sissued on : " \
"%04d-%02d-%02d %02d:%02d:%02d", prefix,
crt->valid_from.year, crt->valid_from.mon,
crt->valid_from.day, crt->valid_from.hour,
crt->valid_from.min, crt->valid_from.sec );
SAFE_SNPRINTF();
ret = snprintf( p, n, "\n%sexpires on : " \
"%04d-%02d-%02d %02d:%02d:%02d", prefix,
crt->valid_to.year, crt->valid_to.mon,
crt->valid_to.day, crt->valid_to.hour,
crt->valid_to.min, crt->valid_to.sec );
SAFE_SNPRINTF();
ret = snprintf( p, n, "\n%ssigned using : ", prefix );
SAFE_SNPRINTF();
ret = oid_get_sig_alg_desc( &crt->sig_oid1, &desc );
if( ret != 0 )
ret = snprintf( p, n, "???" );
else
ret = snprintf( p, n, desc );
SAFE_SNPRINTF();
ret = snprintf( p, n, "\n%sRSA key size : %d bits\n", prefix,
(int) crt->rsa.N.n * (int) sizeof( t_uint ) * 8 );
SAFE_SNPRINTF();
return( (int) ( size - n ) );
}
/*
* Return an informational string describing the given OID
*/
const char *x509_oid_get_description( x509_buf *oid )
{
const char *desc = NULL;
int ret;
ret = oid_get_extended_key_usage( oid, &desc );
if( ret != 0 )
return( NULL );
return( desc );
}
/* Return the x.y.z.... style numeric string for the given OID */
int x509_oid_get_numeric_string( char *buf, size_t size, x509_buf *oid )
{
return oid_get_numeric_string( buf, size, oid );
}
/*
* Return an informational string about the CRL.
*/
int x509parse_crl_info( char *buf, size_t size, const char *prefix,
const x509_crl *crl )
{
int ret;
size_t n;
char *p;
const char *desc;
const x509_crl_entry *entry;
p = buf;
n = size;
ret = snprintf( p, n, "%sCRL version : %d",
prefix, crl->version );
SAFE_SNPRINTF();
ret = snprintf( p, n, "\n%sissuer name : ", prefix );
SAFE_SNPRINTF();
ret = x509parse_dn_gets( p, n, &crl->issuer );
SAFE_SNPRINTF();
ret = snprintf( p, n, "\n%sthis update : " \
"%04d-%02d-%02d %02d:%02d:%02d", prefix,
crl->this_update.year, crl->this_update.mon,
crl->this_update.day, crl->this_update.hour,
crl->this_update.min, crl->this_update.sec );
SAFE_SNPRINTF();
ret = snprintf( p, n, "\n%snext update : " \
"%04d-%02d-%02d %02d:%02d:%02d", prefix,
crl->next_update.year, crl->next_update.mon,
crl->next_update.day, crl->next_update.hour,
crl->next_update.min, crl->next_update.sec );
SAFE_SNPRINTF();
entry = &crl->entry;
ret = snprintf( p, n, "\n%sRevoked certificates:",
prefix );
SAFE_SNPRINTF();
while( entry != NULL && entry->raw.len != 0 )
{
ret = snprintf( p, n, "\n%sserial number: ",
prefix );
SAFE_SNPRINTF();
ret = x509parse_serial_gets( p, n, &entry->serial);
SAFE_SNPRINTF();
ret = snprintf( p, n, " revocation date: " \
"%04d-%02d-%02d %02d:%02d:%02d",
entry->revocation_date.year, entry->revocation_date.mon,
entry->revocation_date.day, entry->revocation_date.hour,
entry->revocation_date.min, entry->revocation_date.sec );
SAFE_SNPRINTF();
entry = entry->next;
}
ret = snprintf( p, n, "\n%ssigned using : ", prefix );
SAFE_SNPRINTF();
ret = oid_get_sig_alg_desc( &crl->sig_oid1, &desc );
if( ret != 0 )
ret = snprintf( p, n, "???" );
else
ret = snprintf( p, n, desc );
SAFE_SNPRINTF();
ret = snprintf( p, n, "\n" );
SAFE_SNPRINTF();
return( (int) ( size - n ) );
}
/*
* Return 0 if the x509_time is still valid, or 1 otherwise.
*/
int x509parse_time_expired( const x509_time *to )
{
int year, mon, day;
int hour, min, sec;
#if defined(_WIN32)
SYSTEMTIME st;
GetLocalTime(&st);
year = st.wYear;
mon = st.wMonth;
day = st.wDay;
hour = st.wHour;
min = st.wMinute;
sec = st.wSecond;
#else
struct tm *lt;
time_t tt;
tt = time( NULL );
lt = localtime( &tt );
year = lt->tm_year + 1900;
mon = lt->tm_mon + 1;
day = lt->tm_mday;
hour = lt->tm_hour;
min = lt->tm_min;
sec = lt->tm_sec;
#endif
if( year > to->year )
return( 1 );
if( year == to->year &&
mon > to->mon )
return( 1 );
if( year == to->year &&
mon == to->mon &&
day > to->day )
return( 1 );
if( year == to->year &&
mon == to->mon &&
day == to->day &&
hour > to->hour )
return( 1 );
if( year == to->year &&
mon == to->mon &&
day == to->day &&
hour == to->hour &&
min > to->min )
return( 1 );
if( year == to->year &&
mon == to->mon &&
day == to->day &&
hour == to->hour &&
min == to->min &&
sec > to->sec )
return( 1 );
return( 0 );
}
/*
* Return 1 if the certificate is revoked, or 0 otherwise.
*/
int x509parse_revoked( const x509_cert *crt, const x509_crl *crl )
{
const x509_crl_entry *cur = &crl->entry;
while( cur != NULL && cur->serial.len != 0 )
{
if( crt->serial.len == cur->serial.len &&
memcmp( crt->serial.p, cur->serial.p, crt->serial.len ) == 0 )
{
if( x509parse_time_expired( &cur->revocation_date ) )
return( 1 );
}
cur = cur->next;
}
return( 0 );
}
/*
* Check that the given certificate is valid accoring to the CRL.
*/
static int x509parse_verifycrl(x509_cert *crt, x509_cert *ca,
x509_crl *crl_list)
{
int flags = 0;
unsigned char hash[POLARSSL_MD_MAX_SIZE];
const md_info_t *md_info;
if( ca == NULL )
return( flags );
/*
* TODO: What happens if no CRL is present?
* Suggestion: Revocation state should be unknown if no CRL is present.
* For backwards compatibility this is not yet implemented.
*/
while( crl_list != NULL )
{
if( crl_list->version == 0 ||
crl_list->issuer_raw.len != ca->subject_raw.len ||
memcmp( crl_list->issuer_raw.p, ca->subject_raw.p,
crl_list->issuer_raw.len ) != 0 )
{
crl_list = crl_list->next;
continue;
}
/*
* Check if CRL is correctly signed by the trusted CA
*/
md_info = md_info_from_type( crl_list->sig_md );
if( md_info == NULL )
{
/*
* Cannot check 'unknown' hash
*/
flags |= BADCRL_NOT_TRUSTED;
break;
}
md( md_info, crl_list->tbs.p, crl_list->tbs.len, hash );
if( !rsa_pkcs1_verify( &ca->rsa, RSA_PUBLIC, crl_list->sig_md,
0, hash, crl_list->sig.p ) == 0 )
{
/*
* CRL is not trusted
*/
flags |= BADCRL_NOT_TRUSTED;
break;
}
/*
* Check for validity of CRL (Do not drop out)
*/
if( x509parse_time_expired( &crl_list->next_update ) )
flags |= BADCRL_EXPIRED;
/*
* Check if certificate is revoked
*/
if( x509parse_revoked(crt, crl_list) )
{
flags |= BADCERT_REVOKED;
break;
}
crl_list = crl_list->next;
}
return flags;
}
int x509_wildcard_verify( const char *cn, x509_buf *name )
{
size_t i;
size_t cn_idx = 0;
if( name->len < 3 || name->p[0] != '*' || name->p[1] != '.' )
return( 0 );
for( i = 0; i < strlen( cn ); ++i )
{
if( cn[i] == '.' )
{
cn_idx = i;
break;
}
}
if( cn_idx == 0 )
return( 0 );
if( strlen( cn ) - cn_idx == name->len - 1 &&
memcmp( name->p + 1, cn + cn_idx, name->len - 1 ) == 0 )
{
return( 1 );
}
return( 0 );
}
static int x509parse_verify_top(
x509_cert *child, x509_cert *trust_ca,
x509_crl *ca_crl, int path_cnt, int *flags,
int (*f_vrfy)(void *, x509_cert *, int, int *),
void *p_vrfy )
{
int ret;
int ca_flags = 0, check_path_cnt = path_cnt + 1;
unsigned char hash[POLARSSL_MD_MAX_SIZE];
const md_info_t *md_info;
if( x509parse_time_expired( &child->valid_to ) )
*flags |= BADCERT_EXPIRED;
/*
* Child is the top of the chain. Check against the trust_ca list.
*/
*flags |= BADCERT_NOT_TRUSTED;
while( trust_ca != NULL )
{
if( trust_ca->version == 0 ||
child->issuer_raw.len != trust_ca->subject_raw.len ||
memcmp( child->issuer_raw.p, trust_ca->subject_raw.p,
child->issuer_raw.len ) != 0 )
{
trust_ca = trust_ca->next;
continue;
}
/*
* Reduce path_len to check against if top of the chain is
* the same as the trusted CA
*/
if( child->subject_raw.len == trust_ca->subject_raw.len &&
memcmp( child->subject_raw.p, trust_ca->subject_raw.p,
child->issuer_raw.len ) == 0 )
{
check_path_cnt--;
}
if( trust_ca->max_pathlen > 0 &&
trust_ca->max_pathlen < check_path_cnt )
{
trust_ca = trust_ca->next;
continue;
}
md_info = md_info_from_type( child->sig_md );
if( md_info == NULL )
{
/*
* Cannot check 'unknown' hash
*/
continue;
}
md( md_info, child->tbs.p, child->tbs.len, hash );
if( rsa_pkcs1_verify( &trust_ca->rsa, RSA_PUBLIC, child->sig_md,
0, hash, child->sig.p ) != 0 )
{
trust_ca = trust_ca->next;
continue;
}
/*
* Top of chain is signed by a trusted CA
*/
*flags &= ~BADCERT_NOT_TRUSTED;
break;
}
/*
* If top of chain is not the same as the trusted CA send a verify request
* to the callback for any issues with validity and CRL presence for the
* trusted CA certificate.
*/
if( trust_ca != NULL &&
( child->subject_raw.len != trust_ca->subject_raw.len ||
memcmp( child->subject_raw.p, trust_ca->subject_raw.p,
child->issuer_raw.len ) != 0 ) )
{
/* Check trusted CA's CRL for then chain's top crt */
*flags |= x509parse_verifycrl( child, trust_ca, ca_crl );
if( x509parse_time_expired( &trust_ca->valid_to ) )
ca_flags |= BADCERT_EXPIRED;
if( NULL != f_vrfy )
{
if( ( ret = f_vrfy( p_vrfy, trust_ca, path_cnt + 1, &ca_flags ) ) != 0 )
return( ret );
}
}
/* Call callback on top cert */
if( NULL != f_vrfy )
{
if( ( ret = f_vrfy(p_vrfy, child, path_cnt, flags ) ) != 0 )
return( ret );
}
*flags |= ca_flags;
return( 0 );
}
static int x509parse_verify_child(
x509_cert *child, x509_cert *parent, x509_cert *trust_ca,
x509_crl *ca_crl, int path_cnt, int *flags,
int (*f_vrfy)(void *, x509_cert *, int, int *),
void *p_vrfy )
{
int ret;
int parent_flags = 0;
unsigned char hash[POLARSSL_MD_MAX_SIZE];
x509_cert *grandparent;
const md_info_t *md_info;
if( x509parse_time_expired( &child->valid_to ) )
*flags |= BADCERT_EXPIRED;
md_info = md_info_from_type( child->sig_md );
if( md_info == NULL )
{
/*
* Cannot check 'unknown' hash
*/
*flags |= BADCERT_NOT_TRUSTED;
}
else
{
md( md_info, child->tbs.p, child->tbs.len, hash );
if( rsa_pkcs1_verify( &parent->rsa, RSA_PUBLIC, child->sig_md, 0, hash,
child->sig.p ) != 0 )
*flags |= BADCERT_NOT_TRUSTED;
}
/* Check trusted CA's CRL for the given crt */
*flags |= x509parse_verifycrl(child, parent, ca_crl);
grandparent = parent->next;
while( grandparent != NULL )
{
if( grandparent->version == 0 ||
grandparent->ca_istrue == 0 ||
parent->issuer_raw.len != grandparent->subject_raw.len ||
memcmp( parent->issuer_raw.p, grandparent->subject_raw.p,
parent->issuer_raw.len ) != 0 )
{
grandparent = grandparent->next;
continue;
}
break;
}
if( grandparent != NULL )
{
/*
* Part of the chain
*/
ret = x509parse_verify_child( parent, grandparent, trust_ca, ca_crl, path_cnt + 1, &parent_flags, f_vrfy, p_vrfy );
if( ret != 0 )
return( ret );
}
else
{
ret = x509parse_verify_top( parent, trust_ca, ca_crl, path_cnt + 1, &parent_flags, f_vrfy, p_vrfy );
if( ret != 0 )
return( ret );
}
/* child is verified to be a child of the parent, call verify callback */
if( NULL != f_vrfy )
if( ( ret = f_vrfy( p_vrfy, child, path_cnt, flags ) ) != 0 )
return( ret );
*flags |= parent_flags;
return( 0 );
}
/*
* Verify the certificate validity
*/
int x509parse_verify( x509_cert *crt,
x509_cert *trust_ca,
x509_crl *ca_crl,
const char *cn, int *flags,
int (*f_vrfy)(void *, x509_cert *, int, int *),
void *p_vrfy )
{
size_t cn_len;
int ret;
int pathlen = 0;
x509_cert *parent;
x509_name *name;
x509_sequence *cur = NULL;
*flags = 0;
if( cn != NULL )
{
name = &crt->subject;
cn_len = strlen( cn );
if( crt->ext_types & EXT_SUBJECT_ALT_NAME )
{
cur = &crt->subject_alt_names;
while( cur != NULL )
{
if( cur->buf.len == cn_len &&
memcmp( cn, cur->buf.p, cn_len ) == 0 )
break;
if( cur->buf.len > 2 &&
memcmp( cur->buf.p, "*.", 2 ) == 0 &&
x509_wildcard_verify( cn, &cur->buf ) )
break;
cur = cur->next;
}
if( cur == NULL )
*flags |= BADCERT_CN_MISMATCH;
}
else
{
while( name != NULL )
{
if( OID_CMP( OID_AT_CN, &name->oid ) )
{
if( name->val.len == cn_len &&
memcmp( name->val.p, cn, cn_len ) == 0 )
break;
if( name->val.len > 2 &&
memcmp( name->val.p, "*.", 2 ) == 0 &&
x509_wildcard_verify( cn, &name->val ) )
break;
}
name = name->next;
}
if( name == NULL )
*flags |= BADCERT_CN_MISMATCH;
}
}
/*
* Iterate upwards in the given cert chain, to find our crt parent.
* Ignore any upper cert with CA != TRUE.
*/
parent = crt->next;
while( parent != NULL && parent->version != 0 )
{
if( parent->ca_istrue == 0 ||
crt->issuer_raw.len != parent->subject_raw.len ||
memcmp( crt->issuer_raw.p, parent->subject_raw.p,
crt->issuer_raw.len ) != 0 )
{
parent = parent->next;
continue;
}
break;
}
if( parent != NULL )
{
/*
* Part of the chain
*/
ret = x509parse_verify_child( crt, parent, trust_ca, ca_crl, pathlen, flags, f_vrfy, p_vrfy );
if( ret != 0 )
return( ret );
}
else
{
ret = x509parse_verify_top( crt, trust_ca, ca_crl, pathlen, flags, f_vrfy, p_vrfy );
if( ret != 0 )
return( ret );
}
if( *flags != 0 )
return( POLARSSL_ERR_X509_CERT_VERIFY_FAILED );
return( 0 );
}
/*
* Unallocate all certificate data
*/
void x509_free( x509_cert *crt )
{
x509_cert *cert_cur = crt;
x509_cert *cert_prv;
x509_name *name_cur;
x509_name *name_prv;
x509_sequence *seq_cur;
x509_sequence *seq_prv;
if( crt == NULL )
return;
do
{
rsa_free( &cert_cur->rsa );
name_cur = cert_cur->issuer.next;
while( name_cur != NULL )
{
name_prv = name_cur;
name_cur = name_cur->next;
memset( name_prv, 0, sizeof( x509_name ) );
free( name_prv );
}
name_cur = cert_cur->subject.next;
while( name_cur != NULL )
{
name_prv = name_cur;
name_cur = name_cur->next;
memset( name_prv, 0, sizeof( x509_name ) );
free( name_prv );
}
seq_cur = cert_cur->ext_key_usage.next;
while( seq_cur != NULL )
{
seq_prv = seq_cur;
seq_cur = seq_cur->next;
memset( seq_prv, 0, sizeof( x509_sequence ) );
free( seq_prv );
}
seq_cur = cert_cur->subject_alt_names.next;
while( seq_cur != NULL )
{
seq_prv = seq_cur;
seq_cur = seq_cur->next;
memset( seq_prv, 0, sizeof( x509_sequence ) );
free( seq_prv );
}
if( cert_cur->raw.p != NULL )
{
memset( cert_cur->raw.p, 0, cert_cur->raw.len );
free( cert_cur->raw.p );
}
cert_cur = cert_cur->next;
}
while( cert_cur != NULL );
cert_cur = crt;
do
{
cert_prv = cert_cur;
cert_cur = cert_cur->next;
memset( cert_prv, 0, sizeof( x509_cert ) );
if( cert_prv != crt )
free( cert_prv );
}
while( cert_cur != NULL );
}
/*
* Unallocate all CRL data
*/
void x509_crl_free( x509_crl *crl )
{
x509_crl *crl_cur = crl;
x509_crl *crl_prv;
x509_name *name_cur;
x509_name *name_prv;
x509_crl_entry *entry_cur;
x509_crl_entry *entry_prv;
if( crl == NULL )
return;
do
{
name_cur = crl_cur->issuer.next;
while( name_cur != NULL )
{
name_prv = name_cur;
name_cur = name_cur->next;
memset( name_prv, 0, sizeof( x509_name ) );
free( name_prv );
}
entry_cur = crl_cur->entry.next;
while( entry_cur != NULL )
{
entry_prv = entry_cur;
entry_cur = entry_cur->next;
memset( entry_prv, 0, sizeof( x509_crl_entry ) );
free( entry_prv );
}
if( crl_cur->raw.p != NULL )
{
memset( crl_cur->raw.p, 0, crl_cur->raw.len );
free( crl_cur->raw.p );
}
crl_cur = crl_cur->next;
}
while( crl_cur != NULL );
crl_cur = crl;
do
{
crl_prv = crl_cur;
crl_cur = crl_cur->next;
memset( crl_prv, 0, sizeof( x509_crl ) );
if( crl_prv != crl )
free( crl_prv );
}
while( crl_cur != NULL );
}
#if defined(POLARSSL_SELF_TEST)
#include "polarssl/certs.h"
/*
* Checkup routine
*/
int x509_self_test( int verbose )
{
#if defined(POLARSSL_CERTS_C) && defined(POLARSSL_MD5_C)
int ret;
int flags;
size_t i, j;
x509_cert cacert;
x509_cert clicert;
rsa_context rsa;
#if defined(POLARSSL_DHM_C)
dhm_context dhm;
#endif
if( verbose != 0 )
printf( " X.509 certificate load: " );
memset( &clicert, 0, sizeof( x509_cert ) );
ret = x509parse_crt( &clicert, (unsigned char *) test_cli_crt,
strlen( test_cli_crt ) );
if( ret != 0 )
{
if( verbose != 0 )
printf( "failed\n" );
return( ret );
}
memset( &cacert, 0, sizeof( x509_cert ) );
ret = x509parse_crt( &cacert, (unsigned char *) test_ca_crt,
strlen( test_ca_crt ) );
if( ret != 0 )
{
if( verbose != 0 )
printf( "failed\n" );
return( ret );
}
if( verbose != 0 )
printf( "passed\n X.509 private key load: " );
i = strlen( test_ca_key );
j = strlen( test_ca_pwd );
rsa_init( &rsa, RSA_PKCS_V15, 0 );
if( ( ret = x509parse_key( &rsa,
(unsigned char *) test_ca_key, i,
(unsigned char *) test_ca_pwd, j ) ) != 0 )
{
if( verbose != 0 )
printf( "failed\n" );
return( ret );
}
if( verbose != 0 )
printf( "passed\n X.509 signature verify: ");
ret = x509parse_verify( &clicert, &cacert, NULL, "PolarSSL Client 2", &flags, NULL, NULL );
if( ret != 0 )
{
printf("%02x", flags);
if( verbose != 0 )
printf( "failed\n" );
return( ret );
}
#if defined(POLARSSL_DHM_C)
if( verbose != 0 )
printf( "passed\n X.509 DHM parameter load: " );
i = strlen( test_dhm_params );
j = strlen( test_ca_pwd );
if( ( ret = x509parse_dhm( &dhm, (unsigned char *) test_dhm_params, i ) ) != 0 )
{
if( verbose != 0 )
printf( "failed\n" );
return( ret );
}
if( verbose != 0 )
printf( "passed\n\n" );
#endif
x509_free( &cacert );
x509_free( &clicert );
rsa_free( &rsa );
#if defined(POLARSSL_DHM_C)
dhm_free( &dhm );
#endif
return( 0 );
#else
((void) verbose);
return( POLARSSL_ERR_X509_FEATURE_UNAVAILABLE );
#endif
}
#endif
#endif
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