244 lines
7.1 KiB
C
244 lines
7.1 KiB
C
/*
|
|
* X.509 Certificate Signing Request writing
|
|
*
|
|
* Copyright (C) 2006-2013, 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.
|
|
*/
|
|
/*
|
|
* References:
|
|
* - CSRs: PKCS#10 v1.7 aka RFC 2986
|
|
* - attributes: PKCS#9 v2.0 aka RFC 2985
|
|
*/
|
|
|
|
#include "polarssl/config.h"
|
|
|
|
#if defined(POLARSSL_X509_CSR_WRITE_C)
|
|
|
|
#include "polarssl/x509_csr.h"
|
|
#include "polarssl/oid.h"
|
|
#include "polarssl/asn1write.h"
|
|
|
|
#if defined(POLARSSL_PEM_WRITE_C)
|
|
#include "polarssl/pem.h"
|
|
#endif
|
|
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
|
|
void x509write_csr_init( x509write_csr *ctx )
|
|
{
|
|
memset( ctx, 0, sizeof(x509write_csr) );
|
|
}
|
|
|
|
void x509write_csr_free( x509write_csr *ctx )
|
|
{
|
|
asn1_free_named_data_list( &ctx->subject );
|
|
asn1_free_named_data_list( &ctx->extensions );
|
|
|
|
memset( ctx, 0, sizeof(x509write_csr) );
|
|
}
|
|
|
|
void x509write_csr_set_md_alg( x509write_csr *ctx, md_type_t md_alg )
|
|
{
|
|
ctx->md_alg = md_alg;
|
|
}
|
|
|
|
void x509write_csr_set_key( x509write_csr *ctx, pk_context *key )
|
|
{
|
|
ctx->key = key;
|
|
}
|
|
|
|
int x509write_csr_set_subject_name( x509write_csr *ctx, char *subject_name )
|
|
{
|
|
return x509_string_to_names( &ctx->subject, subject_name );
|
|
}
|
|
|
|
int x509write_csr_set_extension( x509write_csr *ctx,
|
|
const char *oid, size_t oid_len,
|
|
const unsigned char *val, size_t val_len )
|
|
{
|
|
return x509_set_extension( &ctx->extensions, oid, oid_len,
|
|
0, val, val_len );
|
|
}
|
|
|
|
int x509write_csr_set_key_usage( x509write_csr *ctx, unsigned char key_usage )
|
|
{
|
|
unsigned char buf[4];
|
|
unsigned char *c;
|
|
int ret;
|
|
|
|
c = buf + 4;
|
|
|
|
if( ( ret = asn1_write_bitstring( &c, buf, &key_usage, 7 ) ) != 4 )
|
|
return( ret );
|
|
|
|
ret = x509write_csr_set_extension( ctx, OID_KEY_USAGE,
|
|
OID_SIZE( OID_KEY_USAGE ),
|
|
buf, 4 );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int x509write_csr_set_ns_cert_type( x509write_csr *ctx,
|
|
unsigned char ns_cert_type )
|
|
{
|
|
unsigned char buf[4];
|
|
unsigned char *c;
|
|
int ret;
|
|
|
|
c = buf + 4;
|
|
|
|
if( ( ret = asn1_write_bitstring( &c, buf, &ns_cert_type, 8 ) ) != 4 )
|
|
return( ret );
|
|
|
|
ret = x509write_csr_set_extension( ctx, OID_NS_CERT_TYPE,
|
|
OID_SIZE( OID_NS_CERT_TYPE ),
|
|
buf, 4 );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int x509write_csr_der( x509write_csr *ctx, unsigned char *buf, size_t size,
|
|
int (*f_rng)(void *, unsigned char *, size_t),
|
|
void *p_rng )
|
|
{
|
|
int ret;
|
|
const char *sig_oid;
|
|
size_t sig_oid_len = 0;
|
|
unsigned char *c, *c2;
|
|
unsigned char hash[64];
|
|
unsigned char sig[POLARSSL_MPI_MAX_SIZE];
|
|
unsigned char tmp_buf[2048];
|
|
size_t pub_len = 0, sig_and_oid_len = 0, sig_len;
|
|
size_t len = 0;
|
|
pk_type_t pk_alg;
|
|
|
|
/*
|
|
* Prepare data to be signed in tmp_buf
|
|
*/
|
|
c = tmp_buf + sizeof( tmp_buf );
|
|
|
|
ASN1_CHK_ADD( len, x509_write_extensions( &c, tmp_buf, ctx->extensions ) );
|
|
|
|
if( len )
|
|
{
|
|
ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, len ) );
|
|
ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
|
|
|
|
ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, len ) );
|
|
ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_SET ) );
|
|
|
|
ASN1_CHK_ADD( len, asn1_write_oid( &c, tmp_buf, OID_PKCS9_CSR_EXT_REQ,
|
|
OID_SIZE( OID_PKCS9_CSR_EXT_REQ ) ) );
|
|
|
|
ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, len ) );
|
|
ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
|
|
}
|
|
|
|
ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, len ) );
|
|
ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_CONTEXT_SPECIFIC ) );
|
|
|
|
ASN1_CHK_ADD( pub_len, pk_write_pubkey_der( ctx->key,
|
|
tmp_buf, c - tmp_buf ) );
|
|
c -= pub_len;
|
|
len += pub_len;
|
|
|
|
/*
|
|
* Subject ::= Name
|
|
*/
|
|
ASN1_CHK_ADD( len, x509_write_names( &c, tmp_buf, ctx->subject ) );
|
|
|
|
/*
|
|
* Version ::= INTEGER { v1(0), v2(1), v3(2) }
|
|
*/
|
|
ASN1_CHK_ADD( len, asn1_write_int( &c, tmp_buf, 0 ) );
|
|
|
|
ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, len ) );
|
|
ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
|
|
|
|
/*
|
|
* Prepare signature
|
|
*/
|
|
md( md_info_from_type( ctx->md_alg ), c, len, hash );
|
|
|
|
pk_alg = pk_get_type( ctx->key );
|
|
if( pk_alg == POLARSSL_PK_ECKEY )
|
|
pk_alg = POLARSSL_PK_ECDSA;
|
|
|
|
if( ( ret = pk_sign( ctx->key, ctx->md_alg, hash, 0, sig, &sig_len,
|
|
f_rng, p_rng ) ) != 0 ||
|
|
( ret = oid_get_oid_by_sig_alg( pk_alg, ctx->md_alg,
|
|
&sig_oid, &sig_oid_len ) ) != 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
* Write data to output buffer
|
|
*/
|
|
c2 = buf + size;
|
|
ASN1_CHK_ADD( sig_and_oid_len, x509_write_sig( &c2, buf,
|
|
sig_oid, sig_oid_len, sig, sig_len ) );
|
|
|
|
c2 -= len;
|
|
memcpy( c2, c, len );
|
|
|
|
len += sig_and_oid_len;
|
|
ASN1_CHK_ADD( len, asn1_write_len( &c2, buf, len ) );
|
|
ASN1_CHK_ADD( len, asn1_write_tag( &c2, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
|
|
|
|
return( len );
|
|
}
|
|
|
|
#define PEM_BEGIN_CSR "-----BEGIN CERTIFICATE REQUEST-----\n"
|
|
#define PEM_END_CSR "-----END CERTIFICATE REQUEST-----\n"
|
|
|
|
#if defined(POLARSSL_PEM_WRITE_C)
|
|
int x509write_csr_pem( x509write_csr *ctx, unsigned char *buf, size_t size,
|
|
int (*f_rng)(void *, unsigned char *, size_t),
|
|
void *p_rng )
|
|
{
|
|
int ret;
|
|
unsigned char output_buf[4096];
|
|
size_t olen = 0;
|
|
|
|
if( ( ret = x509write_csr_der( ctx, output_buf, sizeof(output_buf),
|
|
f_rng, p_rng ) ) < 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = pem_write_buffer( PEM_BEGIN_CSR, PEM_END_CSR,
|
|
output_buf + sizeof(output_buf) - ret,
|
|
ret, buf, size, &olen ) ) != 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* POLARSSL_PEM_WRITE_C */
|
|
|
|
#endif /* POLARSSL_X509_CSR_WRITE_C */
|