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1dc344373a
mbedtls/library/x509_create.c
Manuel Pégourié-Gonnard 8abc22dde5 Fix other occurrences of same bounds check issue 
Security impact is the same: not triggerrable remotely except in very specific
use cases

backport of 4dc9b39
2015-10-27 11:47:37 +01:00

347 lines
11 KiB
C
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/*
* X.509 base functions for creating certificates / CSRs
*
* 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.
*/
#if !defined(POLARSSL_CONFIG_FILE)
#include "polarssl/config.h"
#else
#include POLARSSL_CONFIG_FILE
#endif
#if defined(POLARSSL_X509_CREATE_C)
#include "polarssl/x509.h"
#include "polarssl/asn1write.h"
#include "polarssl/oid.h"
#include <string.h>
#if defined(_MSC_VER) && !defined strncasecmp && !defined(EFIX64) && \
!defined(EFI32)
#define strncasecmp _strnicmp
#endif
typedef struct {
const char *name;
size_t name_len;
const char*oid;
} x509_attr_descriptor_t;
#define ADD_STRLEN( s ) s, sizeof( s ) - 1
static const x509_attr_descriptor_t x509_attrs[] =
{
{ ADD_STRLEN( "CN" ), OID_AT_CN },
{ ADD_STRLEN( "commonName" ), OID_AT_CN },
{ ADD_STRLEN( "C" ), OID_AT_COUNTRY },
{ ADD_STRLEN( "countryName" ), OID_AT_COUNTRY },
{ ADD_STRLEN( "O" ), OID_AT_ORGANIZATION },
{ ADD_STRLEN( "organizationName" ), OID_AT_ORGANIZATION },
{ ADD_STRLEN( "L" ), OID_AT_LOCALITY },
{ ADD_STRLEN( "locality" ), OID_AT_LOCALITY },
{ ADD_STRLEN( "R" ), OID_PKCS9_EMAIL },
{ ADD_STRLEN( "OU" ), OID_AT_ORG_UNIT },
{ ADD_STRLEN( "organizationalUnitName" ), OID_AT_ORG_UNIT },
{ ADD_STRLEN( "ST" ), OID_AT_STATE },
{ ADD_STRLEN( "stateOrProvinceName" ), OID_AT_STATE },
{ ADD_STRLEN( "emailAddress" ), OID_PKCS9_EMAIL },
{ ADD_STRLEN( "serialNumber" ), OID_AT_SERIAL_NUMBER },
{ ADD_STRLEN( "postalAddress" ), OID_AT_POSTAL_ADDRESS },
{ ADD_STRLEN( "postalCode" ), OID_AT_POSTAL_CODE },
{ ADD_STRLEN( "dnQualifier" ), OID_AT_DN_QUALIFIER },
{ ADD_STRLEN( "title" ), OID_AT_TITLE },
{ ADD_STRLEN( "surName" ), OID_AT_SUR_NAME },
{ ADD_STRLEN( "SN" ), OID_AT_SUR_NAME },
{ ADD_STRLEN( "givenName" ), OID_AT_GIVEN_NAME },
{ ADD_STRLEN( "GN" ), OID_AT_GIVEN_NAME },
{ ADD_STRLEN( "initials" ), OID_AT_INITIALS },
{ ADD_STRLEN( "pseudonym" ), OID_AT_PSEUDONYM },
{ ADD_STRLEN( "generationQualifier" ), OID_AT_GENERATION_QUALIFIER },
{ ADD_STRLEN( "domainComponent" ), OID_DOMAIN_COMPONENT },
{ ADD_STRLEN( "DC" ), OID_DOMAIN_COMPONENT },
{ NULL, 0, NULL }
};
static const char *x509_at_oid_from_name( const char *name, size_t name_len )
{
const x509_attr_descriptor_t *cur;
for( cur = x509_attrs; cur->name != NULL; cur++ )
if( cur->name_len == name_len &&
strncasecmp( cur->name, name, name_len ) == 0 )
break;
return( cur->oid );
}
int x509_string_to_names( asn1_named_data **head, const char *name )
{
int ret = 0;
const char *s = name, *c = s;
const char *end = s + strlen( s );
const char *oid = NULL;
int in_tag = 1;
char data[X509_MAX_DN_NAME_SIZE];
char *d = data;
/* Clear existing chain if present */
asn1_free_named_data_list( head );
while( c <= end )
{
if( in_tag && *c == '=' )
{
if( ( oid = x509_at_oid_from_name( s, c - s ) ) == NULL )
{
ret = POLARSSL_ERR_X509_UNKNOWN_OID;
goto exit;
}
s = c + 1;
in_tag = 0;
d = data;
}
if( !in_tag && *c == '\\' && c != end )
{
c++;
/* Check for valid escaped characters */
if( c == end || *c != ',' )
{
ret = POLARSSL_ERR_X509_INVALID_NAME;
goto exit;
}
}
else if( !in_tag && ( *c == ',' || c == end ) )
{
if( asn1_store_named_data( head, oid, strlen( oid ),
(unsigned char *) data,
d - data ) == NULL )
{
return( POLARSSL_ERR_X509_MALLOC_FAILED );
}
while( c < end && *(c + 1) == ' ' )
c++;
s = c + 1;
in_tag = 1;
}
if( !in_tag && s != c + 1 )
{
*(d++) = *c;
if( d - data == X509_MAX_DN_NAME_SIZE )
{
ret = POLARSSL_ERR_X509_INVALID_NAME;
goto exit;
}
}
c++;
}
exit:
return( ret );
}
/* The first byte of the value in the asn1_named_data structure is reserved
* to store the critical boolean for us
*/
int x509_set_extension( asn1_named_data **head, const char *oid, size_t oid_len,
int critical, const unsigned char *val, size_t val_len )
{
asn1_named_data *cur;
if( ( cur = asn1_store_named_data( head, oid, oid_len,
NULL, val_len + 1 ) ) == NULL )
{
return( POLARSSL_ERR_X509_MALLOC_FAILED );
}
cur->val.p[0] = critical;
memcpy( cur->val.p + 1, val, val_len );
return( 0 );
}
/*
* RelativeDistinguishedName ::=
* SET OF AttributeTypeAndValue
*
* AttributeTypeAndValue ::= SEQUENCE {
* type AttributeType,
* value AttributeValue }
*
* AttributeType ::= OBJECT IDENTIFIER
*
* AttributeValue ::= ANY DEFINED BY AttributeType
*/
static int x509_write_name( unsigned char **p, unsigned char *start,
const char *oid, size_t oid_len,
const unsigned char *name, size_t name_len )
{
int ret;
size_t len = 0;
// Write PrintableString for all except OID_PKCS9_EMAIL
//
if( OID_SIZE( OID_PKCS9_EMAIL ) == oid_len &&
memcmp( oid, OID_PKCS9_EMAIL, oid_len ) == 0 )
{
ASN1_CHK_ADD( len, asn1_write_ia5_string( p, start,
(const char *) name,
name_len ) );
}
else
{
ASN1_CHK_ADD( len, asn1_write_printable_string( p, start,
(const char *) name,
name_len ) );
}
// Write OID
//
ASN1_CHK_ADD( len, asn1_write_oid( p, start, oid, oid_len ) );
ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED |
ASN1_SEQUENCE ) );
ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED |
ASN1_SET ) );
return( (int) len );
}
int x509_write_names( unsigned char **p, unsigned char *start,
asn1_named_data *first )
{
int ret;
size_t len = 0;
asn1_named_data *cur = first;
while( cur != NULL )
{
ASN1_CHK_ADD( len, x509_write_name( p, start, (char *) cur->oid.p,
cur->oid.len,
cur->val.p, cur->val.len ) );
cur = cur->next;
}
ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED |
ASN1_SEQUENCE ) );
return( (int) len );
}
int x509_write_sig( unsigned char **p, unsigned char *start,
const char *oid, size_t oid_len,
unsigned char *sig, size_t size )
{
int ret;
size_t len = 0;
if( *p < start || (size_t)( *p - start ) < size )
return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
len = size;
(*p) -= len;
memcpy( *p, sig, len );
if( *p - start < 1 )
return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
*--(*p) = 0;
len += 1;
ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_BIT_STRING ) );
// Write OID
//
ASN1_CHK_ADD( len, asn1_write_algorithm_identifier( p, start, oid,
oid_len, 0 ) );
return( (int) len );
}
static int x509_write_extension( unsigned char **p, unsigned char *start,
asn1_named_data *ext )
{
int ret;
size_t len = 0;
ASN1_CHK_ADD( len, asn1_write_raw_buffer( p, start, ext->val.p + 1,
ext->val.len - 1 ) );
ASN1_CHK_ADD( len, asn1_write_len( p, start, ext->val.len - 1 ) );
ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_OCTET_STRING ) );
if( ext->val.p[0] != 0 )
{
ASN1_CHK_ADD( len, asn1_write_bool( p, start, 1 ) );
}
ASN1_CHK_ADD( len, asn1_write_raw_buffer( p, start, ext->oid.p,
ext->oid.len ) );
ASN1_CHK_ADD( len, asn1_write_len( p, start, ext->oid.len ) );
ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_OID ) );
ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED |
ASN1_SEQUENCE ) );
return( (int) len );
}
/*
* Extension ::= SEQUENCE {
* extnID OBJECT IDENTIFIER,
* critical BOOLEAN DEFAULT FALSE,
* extnValue OCTET STRING
* -- contains the DER encoding of an ASN.1 value
* -- corresponding to the extension type identified
* -- by extnID
* }
*/
int x509_write_extensions( unsigned char **p, unsigned char *start,
asn1_named_data *first )
{
int ret;
size_t len = 0;
asn1_named_data *cur_ext = first;
while( cur_ext != NULL )
{
ASN1_CHK_ADD( len, x509_write_extension( p, start, cur_ext ) );
cur_ext = cur_ext->next;
}
return( (int) len );
}
#endif /* POLARSSL_X509_CREATE_C */
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