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/*
* Copyright (C) 2001 Nikos Mavroyanopoulos
*
* This file is part of GNUTLS.
*
* The GNUTLS library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <gnutls_int.h>
#include <gnutls_errors.h>
#include <x509_b64.h>
#include <auth_cert.h>
#include <gnutls_cert.h>
#include <libtasn1.h>
#include <gnutls_datum.h>
#include <gnutls_mpi.h>
#include <gnutls_global.h>
#include <gnutls_pk.h>
#include <debug.h>
#include <gnutls_buffers.h>
#include <gnutls_sig.h>
static
int _gnutls_tls_sign( gnutls_cert* cert, gnutls_privkey* pkey, const gnutls_datum* hash_concat, gnutls_datum *signature);
/* Generates a signature of all the previous sent packets in the
* handshake procedure.
*/
int _gnutls_tls_sign_hdata( gnutls_session session, gnutls_cert* cert, gnutls_privkey* pkey, gnutls_datum *signature) {
gnutls_datum dconcat;
int ret;
opaque concat[36];
GNUTLS_MAC_HANDLE td_md5;
GNUTLS_MAC_HANDLE td_sha;
td_sha = _gnutls_hash_copy( session->internals.handshake_mac_handle_sha);
if (td_sha == NULL) {
gnutls_assert();
return GNUTLS_E_HASH_FAILED;
}
_gnutls_hash_deinit(td_sha, &concat[16]);
switch (cert->subject_pk_algorithm) {
case GNUTLS_PK_RSA:
td_md5 = _gnutls_hash_copy( session->internals.handshake_mac_handle_md5);
if (td_md5 == NULL) {
gnutls_assert();
return GNUTLS_E_HASH_FAILED;
}
_gnutls_hash_deinit(td_md5, concat);
dconcat.data = concat;
dconcat.size = 36;
break;
case GNUTLS_PK_DSA:
dconcat.data = &concat[16];
dconcat.size = 20;
break;
default:
gnutls_assert();
return GNUTLS_E_INTERNAL_ERROR;
}
ret = _gnutls_tls_sign( cert, pkey, &dconcat, signature);
if (ret < 0) {
gnutls_assert();
}
return ret;
}
/* Generates a signature of all the random data and the parameters.
* Used in DHE_* ciphersuites.
*/
int _gnutls_tls_sign_params( gnutls_session session, gnutls_cert* cert, gnutls_privkey* pkey, gnutls_datum* params, gnutls_datum *signature)
{
gnutls_datum dconcat;
int ret;
GNUTLS_MAC_HANDLE td_md5;
GNUTLS_MAC_HANDLE td_sha;
opaque concat[36];
td_sha = _gnutls_hash_init( GNUTLS_MAC_SHA);
if (td_sha == NULL) {
gnutls_assert();
return GNUTLS_E_HASH_FAILED;
}
_gnutls_hash( td_sha, session->security_parameters.client_random, TLS_RANDOM_SIZE);
_gnutls_hash( td_sha, session->security_parameters.server_random, TLS_RANDOM_SIZE);
_gnutls_hash( td_sha, params->data, params->size);
_gnutls_hash_deinit(td_sha, &concat[16]);
switch (cert->subject_pk_algorithm) {
case GNUTLS_PK_RSA:
td_md5 = _gnutls_hash_init( GNUTLS_MAC_MD5);
if (td_md5 == NULL) {
gnutls_assert();
return GNUTLS_E_HASH_FAILED;
}
_gnutls_hash( td_md5, session->security_parameters.client_random, TLS_RANDOM_SIZE);
_gnutls_hash( td_md5, session->security_parameters.server_random, TLS_RANDOM_SIZE);
_gnutls_hash( td_md5, params->data, params->size);
_gnutls_hash_deinit(td_md5, concat);
dconcat.data = concat;
dconcat.size = 36;
break;
case GNUTLS_PK_DSA:
dconcat.data = &concat[16];
dconcat.size = 20;
break;
default:
gnutls_assert();
return GNUTLS_E_INTERNAL_ERROR;
}
ret = _gnutls_tls_sign( cert, pkey, &dconcat, signature);
if (ret < 0) {
gnutls_assert();
}
return ret;
}
/* This will create a PKCS1 or DSA signature, as defined in the TLS protocol.
* Cert is the certificate of the corresponding private key. It is only checked if
* it supports signing.
*/
static
int _gnutls_tls_sign( gnutls_cert* cert, gnutls_privkey* pkey, const gnutls_datum* hash_concat, gnutls_datum *signature)
{
/* If our certificate supports signing
*/
if ( cert != NULL)
if ( cert->keyUsage != 0)
if ( !(cert->keyUsage & KEY_DIGITAL_SIGNATURE)) {
gnutls_assert();
return GNUTLS_E_KEY_USAGE_VIOLATION;
}
return _gnutls_sign( pkey->pk_algorithm, pkey->params, pkey->params_size,
hash_concat, signature);
}
/* This will create a PKCS1 or DSA signature, using the given parameters, and the
* given data. The output will be allocated and be put in signature.
*/
int _gnutls_sign( gnutls_pk_algorithm algo, GNUTLS_MPI* params, int params_size,
const gnutls_datum* data, gnutls_datum *signature)
{
int ret;
switch(algo) {
case GNUTLS_PK_RSA:
/* encrypt */
if ((ret=_gnutls_pkcs1_rsa_encrypt( signature, data, params,
params_size, 1)) < 0) {
gnutls_assert();
return ret;
}
break;
case GNUTLS_PK_DSA:
/* sign */
if ((ret=_gnutls_dsa_sign( signature, data, params,
params_size)) < 0) {
gnutls_assert();
return ret;
}
break;
default:
gnutls_assert();
return GNUTLS_E_INTERNAL_ERROR;
break;
}
return 0;
}
static
int _gnutls_pkcs1_rsa_verify_sig( gnutls_cert *cert, const gnutls_datum *hash_concat,
gnutls_datum *signature)
{
int ret;
gnutls_datum vdata;
if (cert->version == 0 || cert==NULL) { /* this is the only way to check
* if it is initialized
*/
gnutls_assert();
return GNUTLS_E_CERTIFICATE_ERROR;
}
/* If the certificate supports signing continue.
*/
if ( cert != NULL)
if ( cert->keyUsage != 0)
if ( !(cert->keyUsage & KEY_DIGITAL_SIGNATURE)) {
gnutls_assert();
return GNUTLS_E_KEY_USAGE_VIOLATION;
}
switch(cert->subject_pk_algorithm) {
case GNUTLS_PK_RSA:
vdata.data = hash_concat->data;
vdata.size = hash_concat->size;
/* verify signature */
if ( (ret=_gnutls_rsa_verify( &vdata, signature, cert->params,
cert->params_size, 1)) < 0) {
gnutls_assert();
return ret;
}
break;
case GNUTLS_PK_DSA:
vdata.data = &hash_concat->data[16];
vdata.size = 20; /* sha1 */
/* verify signature */
if ( (ret=_gnutls_dsa_verify( &vdata, signature, cert->params,
cert->params_size)) < 0) {
gnutls_assert();
return ret;
}
break;
default:
gnutls_assert();
return GNUTLS_E_INTERNAL_ERROR;
}
return 0;
}
/* Verifies a TLS signature (like the one in the client certificate
* verify message).
*/
int _gnutls_verify_sig_hdata( gnutls_session session, gnutls_cert *cert, gnutls_datum* signature)
{
int ret;
opaque concat[36];
GNUTLS_MAC_HANDLE td_md5;
GNUTLS_MAC_HANDLE td_sha;
gnutls_datum dconcat;
td_md5 = _gnutls_hash_copy( session->internals.handshake_mac_handle_md5);
if (td_md5 == NULL) {
gnutls_assert();
return GNUTLS_E_HASH_FAILED;
}
td_sha = _gnutls_hash_copy( session->internals.handshake_mac_handle_sha);
if (td_sha == NULL) {
gnutls_assert();
_gnutls_hash_deinit( td_md5, NULL);
return GNUTLS_E_HASH_FAILED;
}
_gnutls_hash_deinit(td_md5, concat);
_gnutls_hash_deinit(td_sha, &concat[16]);
dconcat.data = concat;
dconcat.size = 20+16; /* md5+ sha */
ret = _gnutls_pkcs1_rsa_verify_sig( cert, &dconcat, signature);
if (ret < 0) {
gnutls_assert();
return ret;
}
return ret;
}
/* Generates a signature of all the random data and the parameters.
* Used in DHE_* ciphersuites.
*/
int _gnutls_verify_sig_params( gnutls_session session, gnutls_cert *cert, const gnutls_datum* params, gnutls_datum *signature)
{
gnutls_datum dconcat;
int ret;
GNUTLS_MAC_HANDLE td_md5;
GNUTLS_MAC_HANDLE td_sha;
opaque concat[36];
td_md5 = _gnutls_hash_init( GNUTLS_MAC_MD5);
if (td_md5 == NULL) {
gnutls_assert();
return GNUTLS_E_HASH_FAILED;
}
td_sha = _gnutls_hash_init( GNUTLS_MAC_SHA);
if (td_sha == NULL) {
gnutls_assert();
_gnutls_hash_deinit( td_md5, NULL);
return GNUTLS_E_HASH_FAILED;
}
_gnutls_hash( td_md5, session->security_parameters.client_random, TLS_RANDOM_SIZE);
_gnutls_hash( td_md5, session->security_parameters.server_random, TLS_RANDOM_SIZE);
_gnutls_hash( td_md5, params->data, params->size);
_gnutls_hash( td_sha, session->security_parameters.client_random, TLS_RANDOM_SIZE);
_gnutls_hash( td_sha, session->security_parameters.server_random, TLS_RANDOM_SIZE);
_gnutls_hash( td_sha, params->data, params->size);
_gnutls_hash_deinit(td_md5, concat);
_gnutls_hash_deinit(td_sha, &concat[16]);
dconcat.data = concat;
dconcat.size = 36;
ret = _gnutls_pkcs1_rsa_verify_sig( cert, &dconcat, signature);
if (ret < 0) {
gnutls_assert();
return ret;
}
return ret;
}
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