436 lines
13 KiB
C
436 lines
13 KiB
C
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/*
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* X.509 certificate writing
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*
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* Copyright (C) 2006-2013, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* References:
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* - certificates: RFC 5280, updated by RFC 6818
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* - CSRs: PKCS#10 v1.7 aka RFC 2986
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* - attributes: PKCS#9 v2.0 aka RFC 2985
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*/
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#include "polarssl/config.h"
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#if defined(POLARSSL_X509_CRT_WRITE_C)
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#include "polarssl/x509_crt.h"
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#include "polarssl/oid.h"
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#include "polarssl/asn1write.h"
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#include "polarssl/sha1.h"
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#if defined(POLARSSL_PEM_WRITE_C)
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#include "polarssl/pem.h"
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#endif /* POLARSSL_PEM_WRITE_C */
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void x509write_crt_init( x509write_cert *ctx )
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{
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memset( ctx, 0, sizeof(x509write_cert) );
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mpi_init( &ctx->serial );
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ctx->version = X509_CRT_VERSION_3;
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}
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void x509write_crt_free( x509write_cert *ctx )
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{
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mpi_free( &ctx->serial );
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asn1_free_named_data_list( &ctx->subject );
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asn1_free_named_data_list( &ctx->issuer );
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asn1_free_named_data_list( &ctx->extensions );
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memset( ctx, 0, sizeof(x509write_cert) );
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}
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void x509write_crt_set_version( x509write_cert *ctx, int version )
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{
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ctx->version = version;
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}
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void x509write_crt_set_md_alg( x509write_cert *ctx, md_type_t md_alg )
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{
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ctx->md_alg = md_alg;
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}
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void x509write_crt_set_subject_key( x509write_cert *ctx, pk_context *key )
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{
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ctx->subject_key = key;
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}
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void x509write_crt_set_issuer_key( x509write_cert *ctx, pk_context *key )
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{
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ctx->issuer_key = key;
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}
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int x509write_crt_set_subject_name( x509write_cert *ctx,
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const char *subject_name )
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{
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return x509_string_to_names( &ctx->subject, subject_name );
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}
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int x509write_crt_set_issuer_name( x509write_cert *ctx,
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const char *issuer_name )
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{
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return x509_string_to_names( &ctx->issuer, issuer_name );
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}
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int x509write_crt_set_serial( x509write_cert *ctx, const mpi *serial )
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{
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int ret;
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if( ( ret = mpi_copy( &ctx->serial, serial ) ) != 0 )
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return( ret );
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return( 0 );
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}
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int x509write_crt_set_validity( x509write_cert *ctx, const char *not_before,
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const char *not_after )
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{
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if( strlen(not_before) != X509_RFC5280_UTC_TIME_LEN - 1 ||
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strlen(not_after) != X509_RFC5280_UTC_TIME_LEN - 1 )
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{
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return( POLARSSL_ERR_X509_BAD_INPUT_DATA );
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}
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strncpy( ctx->not_before, not_before, X509_RFC5280_UTC_TIME_LEN );
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strncpy( ctx->not_after , not_after , X509_RFC5280_UTC_TIME_LEN );
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ctx->not_before[X509_RFC5280_UTC_TIME_LEN - 1] = 'Z';
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ctx->not_after[X509_RFC5280_UTC_TIME_LEN - 1] = 'Z';
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return( 0 );
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}
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int x509write_crt_set_extension( x509write_cert *ctx,
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const char *oid, size_t oid_len,
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int critical,
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const unsigned char *val, size_t val_len )
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{
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return x509_set_extension( &ctx->extensions, oid, oid_len,
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critical, val, val_len );
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}
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int x509write_crt_set_basic_constraints( x509write_cert *ctx,
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int is_ca, int max_pathlen )
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{
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int ret;
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unsigned char buf[9];
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unsigned char *c = buf + sizeof(buf);
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size_t len = 0;
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memset( buf, 0, sizeof(buf) );
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if( is_ca && max_pathlen > 127 )
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return( POLARSSL_ERR_X509_BAD_INPUT_DATA );
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if( is_ca )
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{
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if( max_pathlen >= 0 )
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{
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ASN1_CHK_ADD( len, asn1_write_int( &c, buf, max_pathlen ) );
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}
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ASN1_CHK_ADD( len, asn1_write_bool( &c, buf, 1 ) );
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}
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ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
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return x509write_crt_set_extension( ctx, OID_BASIC_CONSTRAINTS,
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OID_SIZE( OID_BASIC_CONSTRAINTS ),
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0, buf + sizeof(buf) - len, len );
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}
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#if defined(POLARSSL_SHA1_C)
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int x509write_crt_set_subject_key_identifier( x509write_cert *ctx )
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{
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int ret;
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unsigned char buf[POLARSSL_MPI_MAX_SIZE * 2 + 20]; /* tag, length + 2xMPI */
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unsigned char *c = buf + sizeof(buf);
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size_t len = 0;
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memset( buf, 0, sizeof(buf));
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ASN1_CHK_ADD( len, pk_write_pubkey( &c, buf, ctx->subject_key ) );
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sha1( buf + sizeof(buf) - len, len, buf + sizeof(buf) - 20 );
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c = buf + sizeof(buf) - 20;
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len = 20;
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ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_OCTET_STRING ) );
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return x509write_crt_set_extension( ctx, OID_SUBJECT_KEY_IDENTIFIER,
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OID_SIZE( OID_SUBJECT_KEY_IDENTIFIER ),
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0, buf + sizeof(buf) - len, len );
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}
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int x509write_crt_set_authority_key_identifier( x509write_cert *ctx )
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{
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int ret;
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unsigned char buf[POLARSSL_MPI_MAX_SIZE * 2 + 20]; /* tag, length + 2xMPI */
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unsigned char *c = buf + sizeof(buf);
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size_t len = 0;
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memset( buf, 0, sizeof(buf));
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ASN1_CHK_ADD( len, pk_write_pubkey( &c, buf, ctx->issuer_key ) );
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sha1( buf + sizeof(buf) - len, len, buf + sizeof(buf) - 20 );
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c = buf + sizeof(buf) - 20;
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len = 20;
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ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONTEXT_SPECIFIC | 0 ) );
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ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
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return x509write_crt_set_extension( ctx, OID_AUTHORITY_KEY_IDENTIFIER,
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OID_SIZE( OID_AUTHORITY_KEY_IDENTIFIER ),
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0, buf + sizeof(buf) - len, len );
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}
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#endif /* POLARSSL_SHA1_C */
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int x509write_crt_set_key_usage( x509write_cert *ctx, unsigned char key_usage )
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{
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unsigned char buf[4];
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unsigned char *c;
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int ret;
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c = buf + 4;
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if( ( ret = asn1_write_bitstring( &c, buf, &key_usage, 7 ) ) != 4 )
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return( ret );
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ret = x509write_crt_set_extension( ctx, OID_KEY_USAGE,
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OID_SIZE( OID_KEY_USAGE ),
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1, buf, 4 );
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if( ret != 0 )
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return( ret );
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return( 0 );
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}
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int x509write_crt_set_ns_cert_type( x509write_cert *ctx,
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unsigned char ns_cert_type )
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{
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unsigned char buf[4];
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unsigned char *c;
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int ret;
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c = buf + 4;
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if( ( ret = asn1_write_bitstring( &c, buf, &ns_cert_type, 8 ) ) != 4 )
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return( ret );
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ret = x509write_crt_set_extension( ctx, OID_NS_CERT_TYPE,
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OID_SIZE( OID_NS_CERT_TYPE ),
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0, buf, 4 );
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if( ret != 0 )
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return( ret );
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return( 0 );
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}
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static int x509_write_time( unsigned char **p, unsigned char *start,
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const char *time, size_t size )
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{
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int ret;
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size_t len = 0;
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/*
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* write ASN1_UTC_TIME if year < 2050 (2 bytes shorter)
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*/
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if( time[0] == '2' && time[1] == '0' && time [2] < '5' )
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{
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ASN1_CHK_ADD( len, asn1_write_raw_buffer( p, start,
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(const unsigned char *) time + 2,
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size - 2 ) );
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ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_UTC_TIME ) );
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}
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else
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{
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ASN1_CHK_ADD( len, asn1_write_raw_buffer( p, start,
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(const unsigned char *) time,
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size ) );
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ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_GENERALIZED_TIME ) );
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}
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return( (int) len );
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}
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int x509write_crt_der( x509write_cert *ctx, unsigned char *buf, size_t size,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng )
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{
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int ret;
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const char *sig_oid;
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size_t sig_oid_len = 0;
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unsigned char *c, *c2;
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unsigned char hash[64];
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unsigned char sig[POLARSSL_MPI_MAX_SIZE];
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unsigned char tmp_buf[2048];
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size_t sub_len = 0, pub_len = 0, sig_and_oid_len = 0, sig_len;
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size_t len = 0;
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pk_type_t pk_alg;
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/*
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* Prepare data to be signed in tmp_buf
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*/
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c = tmp_buf + sizeof( tmp_buf );
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/* Signature algorithm needed in TBS, and later for actual signature */
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pk_alg = pk_get_type( ctx->issuer_key );
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if( pk_alg == POLARSSL_PK_ECKEY )
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pk_alg = POLARSSL_PK_ECDSA;
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if( ( ret = oid_get_oid_by_sig_alg( pk_alg, ctx->md_alg,
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&sig_oid, &sig_oid_len ) ) != 0 )
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{
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return( ret );
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}
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/*
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* Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension
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*/
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ASN1_CHK_ADD( len, x509_write_extensions( &c, tmp_buf, ctx->extensions ) );
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ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
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ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 3 ) );
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/*
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* SubjectPublicKeyInfo
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*/
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ASN1_CHK_ADD( pub_len, pk_write_pubkey_der( ctx->subject_key,
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tmp_buf, c - tmp_buf ) );
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c -= pub_len;
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len += pub_len;
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/*
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* Subject ::= Name
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*/
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ASN1_CHK_ADD( len, x509_write_names( &c, tmp_buf, ctx->subject ) );
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/*
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* Validity ::= SEQUENCE {
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* notBefore Time,
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* notAfter Time }
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*/
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sub_len = 0;
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ASN1_CHK_ADD( sub_len, x509_write_time( &c, tmp_buf, ctx->not_after,
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X509_RFC5280_UTC_TIME_LEN ) );
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ASN1_CHK_ADD( sub_len, x509_write_time( &c, tmp_buf, ctx->not_before,
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X509_RFC5280_UTC_TIME_LEN ) );
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len += sub_len;
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ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, sub_len ) );
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||
|
|
ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Issuer ::= Name
|
||
|
|
*/
|
||
|
|
ASN1_CHK_ADD( len, x509_write_names( &c, tmp_buf, ctx->issuer ) );
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Signature ::= AlgorithmIdentifier
|
||
|
|
*/
|
||
|
|
ASN1_CHK_ADD( len, asn1_write_algorithm_identifier( &c, tmp_buf,
|
||
|
|
sig_oid, strlen( sig_oid ), 0 ) );
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Serial ::= INTEGER
|
||
|
|
*/
|
||
|
|
ASN1_CHK_ADD( len, asn1_write_mpi( &c, tmp_buf, &ctx->serial ) );
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Version ::= INTEGER { v1(0), v2(1), v3(2) }
|
||
|
|
*/
|
||
|
|
sub_len = 0;
|
||
|
|
ASN1_CHK_ADD( sub_len, asn1_write_int( &c, tmp_buf, ctx->version ) );
|
||
|
|
len += sub_len;
|
||
|
|
ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, sub_len ) );
|
||
|
|
ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 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 ) );
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Make signature
|
||
|
|
*/
|
||
|
|
md( md_info_from_type( ctx->md_alg ), c, len, hash );
|
||
|
|
|
||
|
|
if( ( ret = pk_sign( ctx->issuer_key, ctx->md_alg, hash, 0, sig, &sig_len,
|
||
|
|
f_rng, p_rng ) ) != 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( (int) len );
|
||
|
|
}
|
||
|
|
|
||
|
|
#define PEM_BEGIN_CRT "-----BEGIN CERTIFICATE-----\n"
|
||
|
|
#define PEM_END_CRT "-----END CERTIFICATE-----\n"
|
||
|
|
|
||
|
|
#if defined(POLARSSL_PEM_WRITE_C)
|
||
|
|
int x509write_crt_pem( x509write_cert *crt, 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_crt_der( crt, output_buf, sizeof(output_buf),
|
||
|
|
f_rng, p_rng ) ) < 0 )
|
||
|
|
{
|
||
|
|
return( ret );
|
||
|
|
}
|
||
|
|
|
||
|
|
if( ( ret = pem_write_buffer( PEM_BEGIN_CRT, PEM_END_CRT,
|
||
|
|
output_buf + sizeof(output_buf) - ret,
|
||
|
|
ret, buf, size, &olen ) ) != 0 )
|
||
|
|
{
|
||
|
|
return( ret );
|
||
|
|
}
|
||
|
|
|
||
|
|
return( 0 );
|
||
|
|
}
|
||
|
|
#endif /* POLARSSL_PEM_WRITE_C */
|
||
|
|
|
||
|
|
#endif /* POLARSSL_X509_CRT_WRITE_C */
|