462 lines
11 KiB
C
462 lines
11 KiB
C
/*
|
|
* X.509 Certificate Signing Request (CSR) parsing
|
|
*
|
|
* Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
|
|
*
|
|
* This file is part of mbed TLS (https://polarssl.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(POLARSSL_CONFIG_FILE)
|
|
#include "polarssl/config.h"
|
|
#else
|
|
#include POLARSSL_CONFIG_FILE
|
|
#endif
|
|
|
|
#if defined(POLARSSL_X509_CSR_PARSE_C)
|
|
|
|
#include "polarssl/x509_csr.h"
|
|
#include "polarssl/oid.h"
|
|
#if defined(POLARSSL_PEM_PARSE_C)
|
|
#include "polarssl/pem.h"
|
|
#endif
|
|
|
|
#if defined(POLARSSL_PLATFORM_C)
|
|
#include "polarssl/platform.h"
|
|
#else
|
|
#define polarssl_malloc malloc
|
|
#define polarssl_free free
|
|
#endif
|
|
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
|
|
#if defined(POLARSSL_FS_IO) || defined(EFIX64) || defined(EFI32)
|
|
#include <stdio.h>
|
|
#endif
|
|
|
|
/* Implementation that should never be optimized out by the compiler */
|
|
static void polarssl_zeroize( void *v, size_t n ) {
|
|
volatile unsigned char *p = v; while( n-- ) *p++ = 0;
|
|
}
|
|
|
|
/*
|
|
* Version ::= INTEGER { v1(0) }
|
|
*/
|
|
static int x509_csr_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_INVALID_VERSION + ret );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Parse a CSR in DER format
|
|
*/
|
|
int x509_csr_parse_der( x509_csr *csr,
|
|
const unsigned char *buf, size_t buflen )
|
|
{
|
|
int ret;
|
|
size_t len;
|
|
unsigned char *p, *end;
|
|
x509_buf sig_params;
|
|
|
|
memset( &sig_params, 0, sizeof( x509_buf ) );
|
|
|
|
/*
|
|
* Check for valid input
|
|
*/
|
|
if( csr == NULL || buf == NULL )
|
|
return( POLARSSL_ERR_X509_BAD_INPUT_DATA );
|
|
|
|
x509_csr_init( csr );
|
|
|
|
/*
|
|
* first copy the raw DER data
|
|
*/
|
|
p = (unsigned char *) polarssl_malloc( len = buflen );
|
|
|
|
if( p == NULL )
|
|
return( POLARSSL_ERR_X509_MALLOC_FAILED );
|
|
|
|
memcpy( p, buf, buflen );
|
|
|
|
csr->raw.p = p;
|
|
csr->raw.len = len;
|
|
end = p + len;
|
|
|
|
/*
|
|
* CertificationRequest ::= SEQUENCE {
|
|
* certificationRequestInfo CertificationRequestInfo,
|
|
* signatureAlgorithm AlgorithmIdentifier,
|
|
* signature BIT STRING
|
|
* }
|
|
*/
|
|
if( ( ret = asn1_get_tag( &p, end, &len,
|
|
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
|
|
{
|
|
x509_csr_free( csr );
|
|
return( POLARSSL_ERR_X509_INVALID_FORMAT );
|
|
}
|
|
|
|
if( len != (size_t) ( end - p ) )
|
|
{
|
|
x509_csr_free( csr );
|
|
return( POLARSSL_ERR_X509_INVALID_FORMAT +
|
|
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
|
|
}
|
|
|
|
/*
|
|
* CertificationRequestInfo ::= SEQUENCE {
|
|
*/
|
|
csr->cri.p = p;
|
|
|
|
if( ( ret = asn1_get_tag( &p, end, &len,
|
|
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
|
|
{
|
|
x509_csr_free( csr );
|
|
return( POLARSSL_ERR_X509_INVALID_FORMAT + ret );
|
|
}
|
|
|
|
end = p + len;
|
|
csr->cri.len = end - csr->cri.p;
|
|
|
|
/*
|
|
* Version ::= INTEGER { v1(0) }
|
|
*/
|
|
if( ( ret = x509_csr_get_version( &p, end, &csr->version ) ) != 0 )
|
|
{
|
|
x509_csr_free( csr );
|
|
return( ret );
|
|
}
|
|
|
|
csr->version++;
|
|
|
|
if( csr->version != 1 )
|
|
{
|
|
x509_csr_free( csr );
|
|
return( POLARSSL_ERR_X509_UNKNOWN_VERSION );
|
|
}
|
|
|
|
/*
|
|
* subject Name
|
|
*/
|
|
csr->subject_raw.p = p;
|
|
|
|
if( ( ret = asn1_get_tag( &p, end, &len,
|
|
ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
|
|
{
|
|
x509_csr_free( csr );
|
|
return( POLARSSL_ERR_X509_INVALID_FORMAT + ret );
|
|
}
|
|
|
|
if( ( ret = x509_get_name( &p, p + len, &csr->subject ) ) != 0 )
|
|
{
|
|
x509_csr_free( csr );
|
|
return( ret );
|
|
}
|
|
|
|
csr->subject_raw.len = p - csr->subject_raw.p;
|
|
|
|
/*
|
|
* subjectPKInfo SubjectPublicKeyInfo
|
|
*/
|
|
if( ( ret = pk_parse_subpubkey( &p, end, &csr->pk ) ) != 0 )
|
|
{
|
|
x509_csr_free( csr );
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
* attributes [0] Attributes
|
|
*/
|
|
if( ( ret = asn1_get_tag( &p, end, &len,
|
|
ASN1_CONSTRUCTED | ASN1_CONTEXT_SPECIFIC ) ) != 0 )
|
|
{
|
|
x509_csr_free( csr );
|
|
return( POLARSSL_ERR_X509_INVALID_FORMAT + ret );
|
|
}
|
|
// TODO Parse Attributes / extension requests
|
|
|
|
p += len;
|
|
|
|
end = csr->raw.p + csr->raw.len;
|
|
|
|
/*
|
|
* signatureAlgorithm AlgorithmIdentifier,
|
|
* signature BIT STRING
|
|
*/
|
|
if( ( ret = x509_get_alg( &p, end, &csr->sig_oid, &sig_params ) ) != 0 )
|
|
{
|
|
x509_csr_free( csr );
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = x509_get_sig_alg( &csr->sig_oid, &sig_params,
|
|
&csr->sig_md, &csr->sig_pk,
|
|
&csr->sig_opts ) ) != 0 )
|
|
{
|
|
x509_csr_free( csr );
|
|
return( POLARSSL_ERR_X509_UNKNOWN_SIG_ALG );
|
|
}
|
|
|
|
if( ( ret = x509_get_sig( &p, end, &csr->sig ) ) != 0 )
|
|
{
|
|
x509_csr_free( csr );
|
|
return( ret );
|
|
}
|
|
|
|
if( p != end )
|
|
{
|
|
x509_csr_free( csr );
|
|
return( POLARSSL_ERR_X509_INVALID_FORMAT +
|
|
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Parse a CSR, allowing for PEM or raw DER encoding
|
|
*/
|
|
int x509_csr_parse( x509_csr *csr, const unsigned char *buf, size_t buflen )
|
|
{
|
|
int ret;
|
|
#if defined(POLARSSL_PEM_PARSE_C)
|
|
size_t use_len;
|
|
pem_context pem;
|
|
#endif
|
|
|
|
/*
|
|
* Check for valid input
|
|
*/
|
|
if( csr == NULL || buf == NULL )
|
|
return( POLARSSL_ERR_X509_BAD_INPUT_DATA );
|
|
|
|
#if defined(POLARSSL_PEM_PARSE_C)
|
|
pem_init( &pem );
|
|
ret = pem_read_buffer( &pem,
|
|
"-----BEGIN CERTIFICATE REQUEST-----",
|
|
"-----END CERTIFICATE REQUEST-----",
|
|
buf, NULL, 0, &use_len );
|
|
|
|
if( ret == 0 )
|
|
{
|
|
/*
|
|
* Was PEM encoded, parse the result
|
|
*/
|
|
if( ( ret = x509_csr_parse_der( csr, pem.buf, pem.buflen ) ) != 0 )
|
|
return( ret );
|
|
|
|
pem_free( &pem );
|
|
return( 0 );
|
|
}
|
|
else if( ret != POLARSSL_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
|
|
{
|
|
pem_free( &pem );
|
|
return( ret );
|
|
}
|
|
else
|
|
#endif /* POLARSSL_PEM_PARSE_C */
|
|
return( x509_csr_parse_der( csr, buf, buflen ) );
|
|
}
|
|
|
|
#if defined(POLARSSL_FS_IO)
|
|
/*
|
|
* Load a CSR into the structure
|
|
*/
|
|
int x509_csr_parse_file( x509_csr *csr, const char *path )
|
|
{
|
|
int ret;
|
|
size_t n;
|
|
unsigned char *buf;
|
|
|
|
if( ( ret = pk_load_file( path, &buf, &n ) ) != 0 )
|
|
return( ret );
|
|
|
|
ret = x509_csr_parse( csr, buf, n );
|
|
|
|
polarssl_zeroize( buf, n + 1 );
|
|
polarssl_free( buf );
|
|
|
|
return( ret );
|
|
}
|
|
#endif /* POLARSSL_FS_IO */
|
|
|
|
#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 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; \
|
|
}
|
|
|
|
#define BEFORE_COLON 14
|
|
#define BC "14"
|
|
/*
|
|
* Return an informational string about the CSR.
|
|
*/
|
|
int x509_csr_info( char *buf, size_t size, const char *prefix,
|
|
const x509_csr *csr )
|
|
{
|
|
int ret;
|
|
size_t n;
|
|
char *p;
|
|
char key_size_str[BEFORE_COLON];
|
|
|
|
p = buf;
|
|
n = size;
|
|
|
|
ret = snprintf( p, n, "%sCSR version : %d",
|
|
prefix, csr->version );
|
|
SAFE_SNPRINTF();
|
|
|
|
ret = snprintf( p, n, "\n%ssubject name : ", prefix );
|
|
SAFE_SNPRINTF();
|
|
ret = x509_dn_gets( p, n, &csr->subject );
|
|
SAFE_SNPRINTF();
|
|
|
|
ret = snprintf( p, n, "\n%ssigned using : ", prefix );
|
|
SAFE_SNPRINTF();
|
|
|
|
ret = x509_sig_alg_gets( p, n, &csr->sig_oid, csr->sig_pk, csr->sig_md,
|
|
csr->sig_opts );
|
|
SAFE_SNPRINTF();
|
|
|
|
if( ( ret = x509_key_size_helper( key_size_str, BEFORE_COLON,
|
|
pk_get_name( &csr->pk ) ) ) != 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
ret = snprintf( p, n, "\n%s%-" BC "s: %d bits\n", prefix, key_size_str,
|
|
(int) pk_get_size( &csr->pk ) );
|
|
SAFE_SNPRINTF();
|
|
|
|
return( (int) ( size - n ) );
|
|
}
|
|
|
|
/*
|
|
* Initialize a CSR
|
|
*/
|
|
void x509_csr_init( x509_csr *csr )
|
|
{
|
|
memset( csr, 0, sizeof(x509_csr) );
|
|
}
|
|
|
|
/*
|
|
* Unallocate all CSR data
|
|
*/
|
|
void x509_csr_free( x509_csr *csr )
|
|
{
|
|
x509_name *name_cur;
|
|
x509_name *name_prv;
|
|
|
|
if( csr == NULL )
|
|
return;
|
|
|
|
pk_free( &csr->pk );
|
|
|
|
#if defined(POLARSSL_X509_RSASSA_PSS_SUPPORT)
|
|
polarssl_free( csr->sig_opts );
|
|
#endif
|
|
|
|
name_cur = csr->subject.next;
|
|
while( name_cur != NULL )
|
|
{
|
|
name_prv = name_cur;
|
|
name_cur = name_cur->next;
|
|
polarssl_zeroize( name_prv, sizeof( x509_name ) );
|
|
polarssl_free( name_prv );
|
|
}
|
|
|
|
if( csr->raw.p != NULL )
|
|
{
|
|
polarssl_zeroize( csr->raw.p, csr->raw.len );
|
|
polarssl_free( csr->raw.p );
|
|
}
|
|
|
|
polarssl_zeroize( csr, sizeof( x509_csr ) );
|
|
}
|
|
|
|
#endif /* POLARSSL_X509_CSR_PARSE_C */
|