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|
/*
* Copyright (C) 2001-2012 Free Software Foundation, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* The GnuTLS 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 program. If not, see <http://www.gnu.org/licenses/>
*
*/
/* Functions that are supposed to run after the handshake procedure is
* finished. These functions activate the established security parameters.
*/
#include "gnutls_int.h"
#include <constate.h>
#include "errors.h"
#include <kx.h>
#include <algorithms.h>
#include <num.h>
#include <datum.h>
#include <state.h>
#include <extensions.h>
#include <buffers.h>
static int
_gnutls_set_kx(gnutls_session_t session, gnutls_kx_algorithm_t algo);
static const char keyexp[] = "key expansion";
static const int keyexp_length = sizeof(keyexp) - 1;
/* This function is to be called after handshake, when master_secret,
* client_random and server_random have been initialized.
* This function creates the keys and stores them into pending session.
* (session->cipher_specs)
*/
static int
_gnutls_set_keys(gnutls_session_t session, record_parameters_st * params,
int hash_size, int IV_size, int key_size)
{
/* FIXME: This function is too long
*/
uint8_t rnd[2 * GNUTLS_RANDOM_SIZE];
uint8_t rrnd[2 * GNUTLS_RANDOM_SIZE];
int pos, ret;
int block_size;
char buf[65];
/* avoid using malloc */
uint8_t key_block[2 * MAX_HASH_SIZE + 2 * MAX_CIPHER_KEY_SIZE +
2 * MAX_CIPHER_BLOCK_SIZE];
record_state_st *client_write, *server_write;
if (session->security_parameters.entity == GNUTLS_CLIENT) {
client_write = ¶ms->write;
server_write = ¶ms->read;
} else {
client_write = ¶ms->read;
server_write = ¶ms->write;
}
block_size = 2 * hash_size + 2 * key_size;
block_size += 2 * IV_size;
memcpy(rnd, session->security_parameters.server_random,
GNUTLS_RANDOM_SIZE);
memcpy(&rnd[GNUTLS_RANDOM_SIZE],
session->security_parameters.client_random,
GNUTLS_RANDOM_SIZE);
memcpy(rrnd, session->security_parameters.client_random,
GNUTLS_RANDOM_SIZE);
memcpy(&rrnd[GNUTLS_RANDOM_SIZE],
session->security_parameters.server_random,
GNUTLS_RANDOM_SIZE);
#ifdef ENABLE_SSL3
if (get_num_version(session) == GNUTLS_SSL3) { /* SSL 3 */
ret =
_gnutls_ssl3_generate_random
(session->security_parameters.master_secret,
GNUTLS_MASTER_SIZE, rnd, 2 * GNUTLS_RANDOM_SIZE,
block_size, key_block);
} else /* TLS 1.0+ */
#endif
ret =
_gnutls_PRF(session,
session->security_parameters.master_secret,
GNUTLS_MASTER_SIZE, keyexp, keyexp_length,
rnd, 2 * GNUTLS_RANDOM_SIZE, block_size,
key_block);
if (ret < 0)
return gnutls_assert_val(ret);
_gnutls_hard_log("INT: KEY BLOCK[%d]: %s\n", block_size,
_gnutls_bin2hex(key_block, block_size, buf,
sizeof(buf), NULL));
pos = 0;
if (hash_size > 0) {
if (_gnutls_set_datum
(&client_write->mac_secret, &key_block[pos],
hash_size) < 0)
return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
pos += hash_size;
if (_gnutls_set_datum
(&server_write->mac_secret, &key_block[pos],
hash_size) < 0)
return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
pos += hash_size;
}
if (key_size > 0) {
uint8_t *client_write_key, *server_write_key;
int client_write_key_size, server_write_key_size;
client_write_key = &key_block[pos];
client_write_key_size = key_size;
pos += key_size;
server_write_key = &key_block[pos];
server_write_key_size = key_size;
pos += key_size;
if (_gnutls_set_datum
(&client_write->key, client_write_key,
client_write_key_size) < 0)
return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
_gnutls_hard_log("INT: CLIENT WRITE KEY [%d]: %s\n",
client_write_key_size,
_gnutls_bin2hex(client_write_key,
client_write_key_size,
buf, sizeof(buf), NULL));
if (_gnutls_set_datum
(&server_write->key, server_write_key,
server_write_key_size) < 0)
return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
_gnutls_hard_log("INT: SERVER WRITE KEY [%d]: %s\n",
server_write_key_size,
_gnutls_bin2hex(server_write_key,
server_write_key_size,
buf, sizeof(buf), NULL));
}
/* IV generation in export and non export ciphers.
*/
if (IV_size > 0) {
if (_gnutls_set_datum
(&client_write->IV, &key_block[pos], IV_size) < 0)
return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
pos += IV_size;
if (_gnutls_set_datum
(&server_write->IV, &key_block[pos], IV_size) < 0)
return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
_gnutls_hard_log("INT: CLIENT WRITE IV [%d]: %s\n",
client_write->IV.size,
_gnutls_bin2hex(client_write->IV.data,
client_write->IV.size,
buf, sizeof(buf), NULL));
_gnutls_hard_log("INT: SERVER WRITE IV [%d]: %s\n",
server_write->IV.size,
_gnutls_bin2hex(server_write->IV.data,
server_write->IV.size,
buf, sizeof(buf), NULL));
}
return 0;
}
static int
_gnutls_init_record_state(record_parameters_st * params,
const version_entry_st * ver, int read,
record_state_st * state)
{
int ret;
gnutls_datum_t *iv = NULL;
if (!_gnutls_version_has_explicit_iv(ver)) {
if (_gnutls_cipher_type(params->cipher) == CIPHER_BLOCK)
iv = &state->IV;
}
ret = _gnutls_auth_cipher_init(&state->cipher_state,
params->cipher, &state->key, iv,
params->mac, &state->mac_secret,
params->etm,
#ifdef ENABLE_SSL3
(ver->id == GNUTLS_SSL3) ? 1 : 0,
#endif
1 - read /*1==encrypt */ );
if (ret < 0 && params->cipher->id != GNUTLS_CIPHER_NULL)
return gnutls_assert_val(ret);
ret =
_gnutls_comp_init(&state->compression_state,
params->compression_algorithm,
read /*1==decompress */ );
if (ret < 0)
return gnutls_assert_val(ret);
return 0;
}
int
_gnutls_epoch_set_cipher_suite(gnutls_session_t session,
int epoch_rel, const uint8_t suite[2])
{
const cipher_entry_st *cipher_algo;
const mac_entry_st *mac_algo;
record_parameters_st *params;
const gnutls_cipher_suite_entry_st *cs;
int ret;
ret = _gnutls_epoch_get(session, epoch_rel, ¶ms);
if (ret < 0)
return gnutls_assert_val(ret);
if (params->initialized
|| params->cipher != NULL || params->mac != NULL)
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
cs = ciphersuite_to_entry(suite);
if (cs == NULL)
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
cipher_algo = cipher_to_entry(cs->block_algorithm);
mac_algo = mac_to_entry(cs->mac_algorithm);
if (_gnutls_cipher_is_ok(cipher_algo) == 0
|| _gnutls_mac_is_ok(mac_algo) == 0)
return gnutls_assert_val(GNUTLS_E_UNWANTED_ALGORITHM);
if (_gnutls_cipher_priority(session, cipher_algo->id) < 0)
return gnutls_assert_val(GNUTLS_E_UNWANTED_ALGORITHM);
if (_gnutls_mac_priority(session, mac_algo->id) < 0)
return gnutls_assert_val(GNUTLS_E_UNWANTED_ALGORITHM);
params->cipher = cipher_algo;
params->mac = mac_algo;
return 0;
}
int
_gnutls_epoch_set_compression(gnutls_session_t session,
int epoch_rel,
gnutls_compression_method_t comp_algo)
{
record_parameters_st *params;
int ret;
ret = _gnutls_epoch_get(session, epoch_rel, ¶ms);
if (ret < 0)
return gnutls_assert_val(ret);
if (params->initialized
|| params->compression_algorithm != GNUTLS_COMP_UNKNOWN)
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
if (_gnutls_compression_is_ok(comp_algo) != 0)
return
gnutls_assert_val
(GNUTLS_E_UNKNOWN_COMPRESSION_ALGORITHM);
params->compression_algorithm = comp_algo;
return 0;
}
void
_gnutls_epoch_set_null_algos(gnutls_session_t session,
record_parameters_st * params)
{
/* This is only called on startup. We are extra paranoid about this
because it may cause unencrypted application data to go out on
the wire. */
if (params->initialized || params->epoch != 0) {
gnutls_assert();
return;
}
params->cipher = cipher_to_entry(GNUTLS_CIPHER_NULL);
params->mac = mac_to_entry(GNUTLS_MAC_NULL);
params->compression_algorithm = GNUTLS_COMP_NULL;
params->initialized = 1;
}
int _gnutls_epoch_set_keys(gnutls_session_t session, uint16_t epoch)
{
int hash_size;
int IV_size;
int key_size;
gnutls_compression_method_t comp_algo;
record_parameters_st *params;
int ret;
const version_entry_st *ver = get_version(session);
if (unlikely(ver == NULL))
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
ret = _gnutls_epoch_get(session, epoch, ¶ms);
if (ret < 0)
return gnutls_assert_val(ret);
if (params->initialized)
return 0;
_gnutls_record_log
("REC[%p]: Initializing epoch #%u\n", session, params->epoch);
comp_algo = params->compression_algorithm;
if (_gnutls_cipher_is_ok(params->cipher) == 0
|| _gnutls_mac_is_ok(params->mac) == 0)
return gnutls_assert_val(GNUTLS_E_UNWANTED_ALGORITHM);
if (_gnutls_cipher_priority(session, params->cipher->id) < 0)
return gnutls_assert_val(GNUTLS_E_UNWANTED_ALGORITHM);
if (_gnutls_mac_priority(session, params->mac->id) < 0)
return gnutls_assert_val(GNUTLS_E_UNWANTED_ALGORITHM);
if (_gnutls_compression_is_ok(comp_algo) != 0)
return
gnutls_assert_val
(GNUTLS_E_UNKNOWN_COMPRESSION_ALGORITHM);
if (!_gnutls_version_has_explicit_iv(ver) &&
_gnutls_cipher_type(params->cipher) == CIPHER_BLOCK) {
IV_size = _gnutls_cipher_get_iv_size(params->cipher);
} else {
IV_size = _gnutls_cipher_get_implicit_iv_size(params->cipher);
}
key_size = _gnutls_cipher_get_key_size(params->cipher);
hash_size = _gnutls_mac_get_key_size(params->mac);
params->etm = session->security_parameters.etm;
ret = _gnutls_set_keys
(session, params, hash_size, IV_size, key_size);
if (ret < 0)
return gnutls_assert_val(ret);
ret = _gnutls_init_record_state(params, ver, 1, ¶ms->read);
if (ret < 0)
return gnutls_assert_val(ret);
ret = _gnutls_init_record_state(params, ver, 0, ¶ms->write);
if (ret < 0)
return gnutls_assert_val(ret);
params->record_sw_size = 0;
_gnutls_record_log("REC[%p]: Epoch #%u ready\n", session,
params->epoch);
params->initialized = 1;
return 0;
}
#define CPY_COMMON dst->entity = src->entity; \
dst->kx_algorithm = src->kx_algorithm; \
memcpy( dst->cipher_suite, src->cipher_suite, 2); \
memcpy( dst->master_secret, src->master_secret, GNUTLS_MASTER_SIZE); \
memcpy( dst->client_random, src->client_random, GNUTLS_RANDOM_SIZE); \
memcpy( dst->server_random, src->server_random, GNUTLS_RANDOM_SIZE); \
memcpy( dst->session_id, src->session_id, GNUTLS_MAX_SESSION_ID_SIZE); \
dst->session_id_size = src->session_id_size; \
dst->cert_type = src->cert_type; \
dst->compression_method = src->compression_method; \
dst->timestamp = src->timestamp; \
dst->ext_master_secret = src->ext_master_secret; \
dst->etm = src->etm; \
dst->max_record_recv_size = src->max_record_recv_size; \
dst->max_record_send_size = src->max_record_send_size
static void _gnutls_set_resumed_parameters(gnutls_session_t session)
{
security_parameters_st *src =
&session->internals.resumed_security_parameters;
security_parameters_st *dst = &session->security_parameters;
CPY_COMMON;
dst->pversion = src->pversion;
}
/* Sets the current connection session to conform with the
* Security parameters(pending session), and initializes encryption.
* Actually it initializes and starts encryption ( so it needs
* secrets and random numbers to have been negotiated)
* This is to be called after sending the Change Cipher Spec packet.
*/
int _gnutls_connection_state_init(gnutls_session_t session)
{
int ret;
/* Setup the master secret
*/
if ((ret = _gnutls_generate_master(session, 0)) < 0)
return gnutls_assert_val(ret);
return 0;
}
int _gnutls_epoch_get_compression(gnutls_session_t session, int epoch)
{
record_parameters_st *params;
int ret;
ret = _gnutls_epoch_get(session, epoch, ¶ms);
if (ret < 0)
return GNUTLS_COMP_UNKNOWN;
return params->compression_algorithm;
}
/* Initializes the read connection session
* (read encrypted data)
*/
int _gnutls_read_connection_state_init(gnutls_session_t session)
{
const uint16_t epoch_next =
session->security_parameters.epoch_next;
int ret;
/* Update internals from CipherSuite selected.
* If we are resuming just copy the connection session
*/
if (session->internals.resumed == RESUME_FALSE) {
ret = _gnutls_set_kx(session,
_gnutls_cipher_suite_get_kx_algo
(session->security_parameters.
cipher_suite));
if (ret < 0)
return ret;
} else if (session->security_parameters.entity == GNUTLS_CLIENT)
_gnutls_set_resumed_parameters(session);
ret = _gnutls_epoch_set_keys(session, epoch_next);
if (ret < 0)
return ret;
_gnutls_handshake_log("HSK[%p]: Cipher Suite: %s\n",
session,
_gnutls_cipher_suite_get_name
(session->security_parameters.cipher_suite));
session->security_parameters.epoch_read = epoch_next;
return 0;
}
/* Initializes the write connection session
* (write encrypted data)
*/
int _gnutls_write_connection_state_init(gnutls_session_t session)
{
const uint16_t epoch_next =
session->security_parameters.epoch_next;
int ret;
/* Update internals from CipherSuite selected.
* If we are resuming just copy the connection session
*/
if (session->internals.resumed == RESUME_FALSE) {
ret = _gnutls_set_kx(session,
_gnutls_cipher_suite_get_kx_algo
(session->security_parameters.
cipher_suite));
if (ret < 0)
return ret;
} else if (session->security_parameters.entity == GNUTLS_SERVER)
_gnutls_set_resumed_parameters(session);
ret = _gnutls_epoch_set_keys(session, epoch_next);
if (ret < 0)
return gnutls_assert_val(ret);
_gnutls_handshake_log("HSK[%p]: Cipher Suite: %s\n", session,
_gnutls_cipher_suite_get_name
(session->security_parameters.cipher_suite));
_gnutls_handshake_log
("HSK[%p]: Initializing internal [write] cipher sessions\n",
session);
session->security_parameters.epoch_write = epoch_next;
return 0;
}
/* Sets the specified kx algorithm into pending session
*/
static int
_gnutls_set_kx(gnutls_session_t session, gnutls_kx_algorithm_t algo)
{
if (_gnutls_kx_is_ok(algo) == 0) {
session->security_parameters.kx_algorithm = algo;
} else
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
if (_gnutls_kx_priority(session, algo) < 0)
return gnutls_assert_val(GNUTLS_E_UNWANTED_ALGORITHM);
return 0;
}
static inline int
epoch_resolve(gnutls_session_t session,
unsigned int epoch_rel, uint16_t * epoch_out)
{
switch (epoch_rel) {
case EPOCH_READ_CURRENT:
*epoch_out = session->security_parameters.epoch_read;
return 0;
case EPOCH_WRITE_CURRENT:
*epoch_out = session->security_parameters.epoch_write;
return 0;
case EPOCH_NEXT:
*epoch_out = session->security_parameters.epoch_next;
return 0;
default:
if (epoch_rel > 0xffffu)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
*epoch_out = epoch_rel;
return 0;
}
}
static inline record_parameters_st **epoch_get_slot(gnutls_session_t
session,
uint16_t epoch)
{
uint16_t epoch_index =
epoch - session->security_parameters.epoch_min;
if (epoch_index >= MAX_EPOCH_INDEX) {
_gnutls_handshake_log
("Epoch %d out of range (idx: %d, max: %d)\n",
(int) epoch, (int) epoch_index, MAX_EPOCH_INDEX);
gnutls_assert();
return NULL;
}
/* The slot may still be empty (NULL) */
return &session->record_parameters[epoch_index];
}
int
_gnutls_epoch_get(gnutls_session_t session, unsigned int epoch_rel,
record_parameters_st ** params_out)
{
uint16_t epoch;
record_parameters_st **params;
int ret;
ret = epoch_resolve(session, epoch_rel, &epoch);
if (ret < 0)
return gnutls_assert_val(ret);
params = epoch_get_slot(session, epoch);
if (params == NULL || *params == NULL)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
*params_out = *params;
return 0;
}
int
_gnutls_epoch_alloc(gnutls_session_t session, uint16_t epoch,
record_parameters_st ** out)
{
record_parameters_st **slot;
_gnutls_record_log("REC[%p]: Allocating epoch #%u\n", session,
epoch);
slot = epoch_get_slot(session, epoch);
/* If slot out of range or not empty. */
if (slot == NULL)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
if (*slot != NULL)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
*slot = gnutls_calloc(1, sizeof(record_parameters_st));
if (*slot == NULL)
return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
(*slot)->epoch = epoch;
(*slot)->cipher = NULL;
(*slot)->mac = NULL;
(*slot)->compression_algorithm = GNUTLS_COMP_UNKNOWN;
if (IS_DTLS(session))
_gnutls_write_uint16(epoch,
UINT64DATA((*slot)->write.
sequence_number));
if (out != NULL)
*out = *slot;
return 0;
}
static inline int
epoch_is_active(gnutls_session_t session, record_parameters_st * params)
{
const security_parameters_st *sp = &session->security_parameters;
if (params->epoch == sp->epoch_read)
return 1;
if (params->epoch == sp->epoch_write)
return 1;
if (params->epoch == sp->epoch_next)
return 1;
return 0;
}
static inline int
epoch_alive(gnutls_session_t session, record_parameters_st * params)
{
if (params->usage_cnt > 0)
return 1;
return epoch_is_active(session, params);
}
void _gnutls_epoch_gc(gnutls_session_t session)
{
int i, j;
unsigned int min_index = 0;
_gnutls_record_log("REC[%p]: Start of epoch cleanup\n", session);
/* Free all dead cipher state */
for (i = 0; i < MAX_EPOCH_INDEX; i++) {
if (session->record_parameters[i] != NULL) {
if (!epoch_is_active
(session, session->record_parameters[i])
&& session->record_parameters[i]->usage_cnt)
_gnutls_record_log
("REC[%p]: Note inactive epoch %d has %d users\n",
session,
session->record_parameters[i]->epoch,
session->record_parameters[i]->
usage_cnt);
if (!epoch_alive
(session, session->record_parameters[i])) {
_gnutls_epoch_free(session,
session->
record_parameters[i]);
session->record_parameters[i] = NULL;
}
}
}
/* Look for contiguous NULLs at the start of the array */
for (i = 0;
i < MAX_EPOCH_INDEX && session->record_parameters[i] == NULL;
i++);
min_index = i;
/* Pick up the slack in the epoch window. */
for (i = 0, j = min_index; j < MAX_EPOCH_INDEX; i++, j++)
session->record_parameters[i] =
session->record_parameters[j];
/* Set the new epoch_min */
if (session->record_parameters[0] != NULL)
session->security_parameters.epoch_min =
session->record_parameters[0]->epoch;
_gnutls_record_log("REC[%p]: End of epoch cleanup\n", session);
}
static inline void free_record_state(record_state_st * state, int d)
{
_gnutls_free_datum(&state->mac_secret);
_gnutls_free_datum(&state->IV);
_gnutls_free_datum(&state->key);
_gnutls_auth_cipher_deinit(&state->cipher_state);
if (state->compression_state.handle != NULL)
_gnutls_comp_deinit(&state->compression_state, d);
}
void
_gnutls_epoch_free(gnutls_session_t session, record_parameters_st * params)
{
_gnutls_record_log("REC[%p]: Epoch #%u freed\n", session,
params->epoch);
free_record_state(¶ms->read, 1);
free_record_state(¶ms->write, 0);
gnutls_free(params);
}
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