/* this is _gnutls_handshake_verify_cert_vrfy for TLS 1.2
*/
static int
_gnutls_handshake_verify_cert_vrfy12 (gnutls_session_t session,
gnutls_pcert_st* cert,
gnutls_datum_t * signature,
gnutls_sign_algorithm_t sign_algo)
{
int ret;
opaque concat[MAX_SIG_SIZE];
digest_hd_st td;
gnutls_datum_t dconcat;
gnutls_sign_algorithm_t _sign_algo;
gnutls_digest_algorithm_t hash_algo;
digest_hd_st *handshake_td;
gnutls_protocol_t ver = gnutls_protocol_get_version (session);
gnutls_pk_algorithm_t pk = gnutls_pubkey_get_pk_algorithm(cert->pubkey, NULL);
handshake_td = &session->internals.handshake_mac_handle.tls12.sha1;
hash_algo = handshake_td->algorithm;
_sign_algo =
_gnutls_x509_pk_to_sign (pk, hash_algo);
if (_sign_algo != sign_algo)
{
handshake_td = &session->internals.handshake_mac_handle.tls12.sha256;
hash_algo = handshake_td->algorithm;
_sign_algo =
_gnutls_x509_pk_to_sign (pk, hash_algo);
if (sign_algo != _sign_algo)
{
gnutls_assert ();
return GNUTLS_E_UNSUPPORTED_SIGNATURE_ALGORITHM;
}
}
ret = _gnutls_hash_copy (&td, handshake_td);
if (ret < 0)
{
gnutls_assert ();
return GNUTLS_E_HASH_FAILED;
}
_gnutls_hash_deinit (&td, concat);
dconcat.data = concat;
dconcat.size = _gnutls_hash_get_algo_len (hash_algo);
ret =
verify_tls_hash (ver, cert, &dconcat, signature, 0, pk);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
return ret;
}
/* this is _gnutls_handshake_verify_crt_vrfy for TLS 1.2
*/
static int
_gnutls_handshake_verify_crt_vrfy12(gnutls_session_t session,
gnutls_pcert_st * cert,
gnutls_datum_t * signature,
gnutls_sign_algorithm_t sign_algo)
{
int ret;
uint8_t concat[MAX_HASH_SIZE];
gnutls_datum_t dconcat;
const version_entry_st *ver = get_version(session);
gnutls_pk_algorithm_t pk =
gnutls_pubkey_get_pk_algorithm(cert->pubkey, NULL);
const mac_entry_st *me;
ret = _gnutls_session_sign_algo_enabled(session, sign_algo);
if (ret < 0)
return gnutls_assert_val(ret);
gnutls_sign_algorithm_set_client(session, sign_algo);
me = hash_to_entry(gnutls_sign_get_hash_algorithm(sign_algo));
ret =
_gnutls_hash_fast((gnutls_digest_algorithm_t)me->id,
session->internals.handshake_hash_buffer.
data,
session->internals.
handshake_hash_buffer_prev_len, concat);
if (ret < 0)
return gnutls_assert_val(ret);
dconcat.data = concat;
dconcat.size = _gnutls_hash_get_algo_len(me);
ret =
verify_tls_hash(session, ver, cert, &dconcat, signature, 0,
sign_algo, pk);
if (ret < 0) {
gnutls_assert();
return ret;
}
return ret;
}
/* Verifies a TLS signature (like the one in the client certificate
* verify message).
*/
int
_gnutls_handshake_verify_crt_vrfy(gnutls_session_t session,
gnutls_pcert_st * cert,
gnutls_datum_t * signature,
gnutls_sign_algorithm_t sign_algo)
{
int ret;
uint8_t concat[MAX_SIG_SIZE];
digest_hd_st td_md5;
digest_hd_st td_sha;
gnutls_datum_t dconcat;
const version_entry_st *ver = get_version(session);
_gnutls_handshake_log("HSK[%p]: verify cert vrfy: using %s\n",
session,
gnutls_sign_algorithm_get_name(sign_algo));
if (unlikely(ver == NULL))
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
if (_gnutls_version_has_selectable_sighash(ver))
return _gnutls_handshake_verify_crt_vrfy12(session, cert,
signature,
sign_algo);
ret = _gnutls_hash_init(&td_md5, hash_to_entry(GNUTLS_DIG_MD5));
if (ret < 0) {
gnutls_assert();
return ret;
}
ret = _gnutls_hash_init(&td_sha, hash_to_entry(GNUTLS_DIG_SHA1));
if (ret < 0) {
gnutls_assert();
_gnutls_hash_deinit(&td_md5, NULL);
return GNUTLS_E_HASH_FAILED;
}
_gnutls_hash(&td_sha,
session->internals.handshake_hash_buffer.data,
session->internals.handshake_hash_buffer_prev_len);
_gnutls_hash(&td_md5,
session->internals.handshake_hash_buffer.data,
session->internals.handshake_hash_buffer_prev_len);
if (ver->id == GNUTLS_SSL3) {
ret = _gnutls_generate_master(session, 1);
if (ret < 0) {
_gnutls_hash_deinit(&td_md5, NULL);
_gnutls_hash_deinit(&td_sha, NULL);
return gnutls_assert_val(ret);
}
ret = _gnutls_mac_deinit_ssl3_handshake(&td_md5, concat,
session->security_parameters.
master_secret,
GNUTLS_MASTER_SIZE);
if (ret < 0) {
_gnutls_hash_deinit(&td_sha, NULL);
return gnutls_assert_val(ret);
}
ret =
_gnutls_mac_deinit_ssl3_handshake(&td_sha, &concat[16],
session->security_parameters.
master_secret,
GNUTLS_MASTER_SIZE);
if (ret < 0) {
return gnutls_assert_val(ret);
}
} else {
_gnutls_hash_deinit(&td_md5, concat);
_gnutls_hash_deinit(&td_sha, &concat[16]);
}
dconcat.data = concat;
dconcat.size = 20 + 16; /* md5+ sha */
ret =
verify_tls_hash(session, ver, cert, &dconcat, signature, 16,
GNUTLS_SIGN_UNKNOWN,
gnutls_pubkey_get_pk_algorithm(cert->pubkey,
NULL));
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_handshake_verify_data(gnutls_session_t session,
gnutls_pcert_st * cert,
const gnutls_datum_t * params,
gnutls_datum_t * signature,
gnutls_sign_algorithm_t sign_algo)
{
gnutls_datum_t dconcat;
int ret;
digest_hd_st td_md5;
digest_hd_st td_sha;
uint8_t concat[MAX_SIG_SIZE];
const version_entry_st *ver = get_version(session);
gnutls_digest_algorithm_t hash_algo;
const mac_entry_st *me;
if (_gnutls_version_has_selectable_sighash(ver)) {
_gnutls_handshake_log
("HSK[%p]: verify handshake data: using %s\n", session,
gnutls_sign_algorithm_get_name(sign_algo));
ret =
_gnutls_pubkey_compatible_with_sig(session,
cert->pubkey, ver,
sign_algo);
if (ret < 0)
return gnutls_assert_val(ret);
ret =
_gnutls_session_sign_algo_enabled(session, sign_algo);
if (ret < 0)
return gnutls_assert_val(ret);
hash_algo = gnutls_sign_get_hash_algorithm(sign_algo);
me = hash_to_entry(hash_algo);
} else {
me = hash_to_entry(GNUTLS_DIG_MD5);
ret = _gnutls_hash_init(&td_md5, me);
if (ret < 0) {
gnutls_assert();
return ret;
}
_gnutls_hash(&td_md5,
session->security_parameters.client_random,
GNUTLS_RANDOM_SIZE);
_gnutls_hash(&td_md5,
session->security_parameters.server_random,
GNUTLS_RANDOM_SIZE);
_gnutls_hash(&td_md5, params->data, params->size);
me = hash_to_entry(GNUTLS_DIG_SHA1);
}
ret = _gnutls_hash_init(&td_sha, me);
if (ret < 0) {
gnutls_assert();
if (!_gnutls_version_has_selectable_sighash(ver))
_gnutls_hash_deinit(&td_md5, NULL);
return ret;
}
_gnutls_hash(&td_sha, session->security_parameters.client_random,
GNUTLS_RANDOM_SIZE);
_gnutls_hash(&td_sha, session->security_parameters.server_random,
GNUTLS_RANDOM_SIZE);
_gnutls_hash(&td_sha, params->data, params->size);
if (!_gnutls_version_has_selectable_sighash(ver)) {
_gnutls_hash_deinit(&td_md5, concat);
_gnutls_hash_deinit(&td_sha, &concat[16]);
dconcat.data = concat;
dconcat.size = 36;
} else {
_gnutls_hash_deinit(&td_sha, concat);
dconcat.data = concat;
dconcat.size = _gnutls_hash_get_algo_len(me);
}
ret = verify_tls_hash(session, ver, cert, &dconcat, signature,
dconcat.size - _gnutls_hash_get_algo_len(me),
sign_algo,
gnutls_sign_get_pk_algorithm(sign_algo));
if (ret < 0) {
gnutls_assert();
return ret;
}
return ret;
}
/* Verifies a TLS signature (like the one in the client certificate
* verify message).
*/
int
_gnutls_handshake_verify_cert_vrfy (gnutls_session_t session,
gnutls_pcert_st *cert,
gnutls_datum_t * signature,
gnutls_sign_algorithm_t sign_algo)
{
int ret;
opaque concat[MAX_SIG_SIZE];
digest_hd_st td_md5;
digest_hd_st td_sha;
gnutls_datum_t dconcat;
gnutls_protocol_t ver = gnutls_protocol_get_version (session);
_gnutls_handshake_log ("HSK[%p]: verify cert vrfy: using %s\n",
session, gnutls_sign_algorithm_get_name (sign_algo));
if (session->security_parameters.handshake_mac_handle_type ==
HANDSHAKE_MAC_TYPE_12)
{
return _gnutls_handshake_verify_cert_vrfy12 (session, cert, signature,
sign_algo);
}
else if (session->security_parameters.handshake_mac_handle_type !=
HANDSHAKE_MAC_TYPE_10)
{
gnutls_assert ();
return GNUTLS_E_INTERNAL_ERROR;
}
ret =
_gnutls_hash_copy (&td_md5,
&session->internals.handshake_mac_handle.tls10.md5);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
ret =
_gnutls_hash_copy (&td_sha,
&session->internals.handshake_mac_handle.tls10.sha);
if (ret < 0)
{
gnutls_assert ();
_gnutls_hash_deinit (&td_md5, NULL);
return GNUTLS_E_HASH_FAILED;
}
if (ver == GNUTLS_SSL3)
{
ret = _gnutls_generate_master (session, 1);
if (ret < 0)
{
_gnutls_hash_deinit (&td_md5, NULL);
_gnutls_hash_deinit (&td_sha, NULL);
return gnutls_assert_val(ret);
}
ret = _gnutls_mac_deinit_ssl3_handshake (&td_md5, concat,
session->
security_parameters.master_secret,
GNUTLS_MASTER_SIZE);
if (ret < 0)
{
_gnutls_hash_deinit (&td_sha, NULL);
return gnutls_assert_val(ret);
}
ret = _gnutls_mac_deinit_ssl3_handshake (&td_sha, &concat[16],
session->
security_parameters.master_secret,
GNUTLS_MASTER_SIZE);
if (ret < 0)
{
return gnutls_assert_val(ret);
}
}
else
{
_gnutls_hash_deinit (&td_md5, concat);
_gnutls_hash_deinit (&td_sha, &concat[16]);
}
dconcat.data = concat;
dconcat.size = 20 + 16; /* md5+ sha */
ret =
verify_tls_hash (ver, cert, &dconcat, signature, 16,
gnutls_pubkey_get_pk_algorithm(cert->pubkey, NULL));
if (ret < 0)
{
gnutls_assert ();
return ret;
}
return ret;
}