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3c89dca09e
mbedtls/library/x509write_crt.c
Hanno Becker 3c89dca09e Omit version from X.509 v1 certificates 
The version field in an X.509 certificate is optional and defaults to v1, so it
may be omitted in this case.
2017-10-05 07:39:45 +01:00

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/*
* X.509 certificate writing
*
* 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.
*/
/*
* References:
* - certificates: RFC 5280, updated by RFC 6818
* - CSRs: PKCS#10 v1.7 aka RFC 2986
* - attributes: PKCS#9 v2.0 aka RFC 2985
*/
#if !defined(POLARSSL_CONFIG_FILE)
#include "polarssl/config.h"
#else
#include POLARSSL_CONFIG_FILE
#endif
#if defined(POLARSSL_X509_CRT_WRITE_C)
#include "polarssl/x509_crt.h"
#include "polarssl/oid.h"
#include "polarssl/asn1write.h"
#include "polarssl/sha1.h"
#include <string.h>
#if defined(POLARSSL_PEM_WRITE_C)
#include "polarssl/pem.h"
#endif /* POLARSSL_PEM_WRITE_C */
/* 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;
}
void x509write_crt_init( x509write_cert *ctx )
{
memset( ctx, 0, sizeof(x509write_cert) );
mpi_init( &ctx->serial );
ctx->version = X509_CRT_VERSION_3;
}
void x509write_crt_free( x509write_cert *ctx )
{
mpi_free( &ctx->serial );
asn1_free_named_data_list( &ctx->subject );
asn1_free_named_data_list( &ctx->issuer );
asn1_free_named_data_list( &ctx->extensions );
polarssl_zeroize( ctx, sizeof(x509write_cert) );
}
void x509write_crt_set_version( x509write_cert *ctx, int version )
{
ctx->version = version;
}
void x509write_crt_set_md_alg( x509write_cert *ctx, md_type_t md_alg )
{
ctx->md_alg = md_alg;
}
void x509write_crt_set_subject_key( x509write_cert *ctx, pk_context *key )
{
ctx->subject_key = key;
}
void x509write_crt_set_issuer_key( x509write_cert *ctx, pk_context *key )
{
ctx->issuer_key = key;
}
int x509write_crt_set_subject_name( x509write_cert *ctx,
const char *subject_name )
{
return x509_string_to_names( &ctx->subject, subject_name );
}
int x509write_crt_set_issuer_name( x509write_cert *ctx,
const char *issuer_name )
{
return x509_string_to_names( &ctx->issuer, issuer_name );
}
int x509write_crt_set_serial( x509write_cert *ctx, const mpi *serial )
{
int ret;
if( ( ret = mpi_copy( &ctx->serial, serial ) ) != 0 )
return( ret );
return( 0 );
}
int x509write_crt_set_validity( x509write_cert *ctx, const char *not_before,
const char *not_after )
{
if( strlen( not_before ) != X509_RFC5280_UTC_TIME_LEN - 1 ||
strlen( not_after ) != X509_RFC5280_UTC_TIME_LEN - 1 )
{
return( POLARSSL_ERR_X509_BAD_INPUT_DATA );
}
strncpy( ctx->not_before, not_before, X509_RFC5280_UTC_TIME_LEN );
strncpy( ctx->not_after , not_after , X509_RFC5280_UTC_TIME_LEN );
ctx->not_before[X509_RFC5280_UTC_TIME_LEN - 1] = 'Z';
ctx->not_after[X509_RFC5280_UTC_TIME_LEN - 1] = 'Z';
return( 0 );
}
int x509write_crt_set_extension( x509write_cert *ctx,
const char *oid, size_t oid_len,
int critical,
const unsigned char *val, size_t val_len )
{
return x509_set_extension( &ctx->extensions, oid, oid_len,
critical, val, val_len );
}
int x509write_crt_set_basic_constraints( x509write_cert *ctx,
int is_ca, int max_pathlen )
{
int ret;
unsigned char buf[9];
unsigned char *c = buf + sizeof(buf);
size_t len = 0;
memset( buf, 0, sizeof(buf) );
if( is_ca && max_pathlen > 127 )
return( POLARSSL_ERR_X509_BAD_INPUT_DATA );
if( is_ca )
{
if( max_pathlen >= 0 )
{
ASN1_CHK_ADD( len, asn1_write_int( &c, buf, max_pathlen ) );
}
ASN1_CHK_ADD( len, asn1_write_bool( &c, buf, 1 ) );
}
ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED |
ASN1_SEQUENCE ) );
return x509write_crt_set_extension( ctx, OID_BASIC_CONSTRAINTS,
OID_SIZE( OID_BASIC_CONSTRAINTS ),
0, buf + sizeof(buf) - len, len );
}
#if defined(POLARSSL_SHA1_C)
int x509write_crt_set_subject_key_identifier( x509write_cert *ctx )
{
int ret;
unsigned char buf[POLARSSL_MPI_MAX_SIZE * 2 + 20]; /* tag, length + 2xMPI */
unsigned char *c = buf + sizeof(buf);
size_t len = 0;
memset( buf, 0, sizeof(buf) );
ASN1_CHK_ADD( len, pk_write_pubkey( &c, buf, ctx->subject_key ) );
sha1( buf + sizeof(buf) - len, len, buf + sizeof(buf) - 20 );
c = buf + sizeof(buf) - 20;
len = 20;
ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_OCTET_STRING ) );
return x509write_crt_set_extension( ctx, OID_SUBJECT_KEY_IDENTIFIER,
OID_SIZE( OID_SUBJECT_KEY_IDENTIFIER ),
0, buf + sizeof(buf) - len, len );
}
int x509write_crt_set_authority_key_identifier( x509write_cert *ctx )
{
int ret;
unsigned char buf[POLARSSL_MPI_MAX_SIZE * 2 + 20]; /* tag, length + 2xMPI */
unsigned char *c = buf + sizeof(buf);
size_t len = 0;
memset( buf, 0, sizeof(buf) );
ASN1_CHK_ADD( len, pk_write_pubkey( &c, buf, ctx->issuer_key ) );
sha1( buf + sizeof(buf) - len, len, buf + sizeof(buf) - 20 );
c = buf + sizeof(buf) - 20;
len = 20;
ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONTEXT_SPECIFIC | 0 ) );
ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED |
ASN1_SEQUENCE ) );
return x509write_crt_set_extension( ctx, OID_AUTHORITY_KEY_IDENTIFIER,
OID_SIZE( OID_AUTHORITY_KEY_IDENTIFIER ),
0, buf + sizeof(buf) - len, len );
}
#endif /* POLARSSL_SHA1_C */
int x509write_crt_set_key_usage( x509write_cert *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_crt_set_extension( ctx, OID_KEY_USAGE,
OID_SIZE( OID_KEY_USAGE ),
1, buf, 4 );
if( ret != 0 )
return( ret );
return( 0 );
}
int x509write_crt_set_ns_cert_type( x509write_cert *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_crt_set_extension( ctx, OID_NS_CERT_TYPE,
OID_SIZE( OID_NS_CERT_TYPE ),
0, buf, 4 );
if( ret != 0 )
return( ret );
return( 0 );
}
static int x509_write_time( unsigned char **p, unsigned char *start,
const char *t, size_t size )
{
int ret;
size_t len = 0;
/*
* write ASN1_UTC_TIME if year < 2050 (2 bytes shorter)
*/
if( t[0] == '2' && t[1] == '0' && t[2] < '5' )
{
ASN1_CHK_ADD( len, asn1_write_raw_buffer( p, start,
(const unsigned char *) t + 2,
size - 2 ) );
ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_UTC_TIME ) );
}
else
{
ASN1_CHK_ADD( len, asn1_write_raw_buffer( p, start,
(const unsigned char *) t,
size ) );
ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_GENERALIZED_TIME ) );
}
return( (int) len );
}
int x509write_crt_der( x509write_cert *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 sub_len = 0, 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 );
/* Signature algorithm needed in TBS, and later for actual signature */
/* There's no direct way of extracting a signature algorithm
* (represented as an element of pk_type_t) from a PK instance. */
if( pk_can_do( ctx->issuer_key, POLARSSL_PK_RSA ) )
pk_alg = POLARSSL_PK_RSA;
else if( pk_can_do( ctx->issuer_key, POLARSSL_PK_ECDSA ) )
pk_alg = POLARSSL_PK_ECDSA;
else
return( POLARSSL_ERR_X509_INVALID_ALG );
if( ( ret = oid_get_oid_by_sig_alg( pk_alg, ctx->md_alg,
&sig_oid, &sig_oid_len ) ) != 0 )
{
return( ret );
}
/*
* Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension
*/
ASN1_CHK_ADD( len, x509_write_extensions( &c, tmp_buf, ctx->extensions ) );
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_CONTEXT_SPECIFIC |
ASN1_CONSTRUCTED | 3 ) );
/*
* SubjectPublicKeyInfo
*/
ASN1_CHK_ADD( pub_len, pk_write_pubkey_der( ctx->subject_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 ) );
/*
* Validity ::= SEQUENCE {
* notBefore Time,
* notAfter Time }
*/
sub_len = 0;
ASN1_CHK_ADD( sub_len, x509_write_time( &c, tmp_buf, ctx->not_after,
X509_RFC5280_UTC_TIME_LEN ) );
ASN1_CHK_ADD( sub_len, x509_write_time( &c, tmp_buf, ctx->not_before,
X509_RFC5280_UTC_TIME_LEN ) );
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_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) }
*/
if( ctx->version != X509_CRT_VERSION_1 )
{
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 ) );
if( len > (size_t)( c2 - buf ) )
return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
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 */
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