Author: Pekka Riikonen <priikone@silcnet.org>
- Copyright (C) 2000 - 2006 Pekka Riikonen
+ Copyright (C) 2000 - 2008 Pekka Riikonen
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
/************************ Static utility functions **************************/
+/* States */
SILC_FSM_STATE(silc_ske_st_initiator_start);
SILC_FSM_STATE(silc_ske_st_initiator_phase1);
SILC_FSM_STATE(silc_ske_st_initiator_phase2);
SILC_FSM_STATE(silc_ske_st_responder_aborted);
SILC_FSM_STATE(silc_ske_st_responder_failure);
SILC_FSM_STATE(silc_ske_st_responder_error);
+SILC_FSM_STATE(silc_ske_st_rekey_initiator_start);
+SILC_FSM_STATE(silc_ske_st_rekey_initiator_done);
+SILC_FSM_STATE(silc_ske_st_rekey_initiator_end);
+SILC_FSM_STATE(silc_ske_st_rekey_responder_wait);
+SILC_FSM_STATE(silc_ske_st_rekey_responder_start);
+SILC_FSM_STATE(silc_ske_st_rekey_responder_done);
+SILC_FSM_STATE(silc_ske_st_rekey_responder_end);
+SILC_TASK_CALLBACK(silc_ske_packet_send_retry);
SilcSKEKeyMaterial
silc_ske_process_key_material(SilcSKE ske,
SilcUInt32 req_iv_len,
SilcUInt32 req_enc_key_len,
- SilcUInt32 req_hmac_key_len);
+ SilcUInt32 req_hmac_key_len,
+ SilcSKERekeyMaterial *rekey);
static SilcBool silc_ske_packet_send(SilcSKE ske,
SilcPacketType type,
SilcPacketFlags flags,
void *app_context)
{
SilcSKE ske = callback_context;
+
+ /* Clear retransmission */
+ ske->retry_timer = SILC_SKE_RETRY_MIN;
+ ske->retry_count = 0;
+ silc_schedule_task_del_by_callback(ske->schedule,
+ silc_ske_packet_send_retry);
+
+ /* Signal for new packet */
ske->packet = packet;
- silc_fsm_continue(&ske->fsm);
+
+ /* Check if we were aborted */
+ if (ske->aborted) {
+ silc_packet_free(packet);
+ ske->packet = NULL;
+
+ if (ske->responder)
+ silc_fsm_next(&ske->fsm, silc_ske_st_responder_aborted);
+ else
+ silc_fsm_next(&ske->fsm, silc_ske_st_initiator_aborted);
+
+ silc_fsm_continue_sync(&ske->fsm);
+ return TRUE;
+ }
+
+ /* See if received failure from remote */
+ if (packet->type == SILC_PACKET_FAILURE) {
+ if (ske->responder)
+ silc_fsm_next(&ske->fsm, silc_ske_st_responder_failure);
+ else
+ silc_fsm_next(&ske->fsm, silc_ske_st_initiator_failure);
+ }
+
+ /* Handle rekey and SUCCESS packets synchronously. After SUCCESS packets
+ they keys are taken into use immediately, hence the synchronous
+ processing to get the keys in use as soon as possible. */
+ if (ske->rekeying || packet->type == SILC_PACKET_SUCCESS)
+ silc_fsm_continue_sync(&ske->fsm);
+ else
+ silc_fsm_continue(&ske->fsm);
+
return TRUE;
}
static SilcSKEStatus silc_ske_check_version(SilcSKE ske)
{
- SilcUInt32 l_protocol_version = 0, r_protocol_version = 0;
SilcUInt32 r_software_version = 0;
+ char *r_software_string = NULL;
if (!ske->remote_version || !ske->version)
return SILC_SKE_STATUS_BAD_VERSION;
- if (!silc_parse_version_string(ske->remote_version, &r_protocol_version,
- NULL, &r_software_version, NULL, NULL))
+ if (!silc_parse_version_string(ske->remote_version, NULL, NULL,
+ &r_software_version,
+ &r_software_string, NULL))
return SILC_SKE_STATUS_BAD_VERSION;
- if (!silc_parse_version_string(ske->version, &l_protocol_version,
- NULL, NULL, NULL, NULL))
- return SILC_SKE_STATUS_BAD_VERSION;
-
- /* If remote is too new, don't connect */
- if (l_protocol_version < r_protocol_version)
- return SILC_SKE_STATUS_BAD_VERSION;
-
- /* Backwards compatibility checks */
-
- /* Old server versions requires "valid" looking Source ID in the SILC
- packets during initial key exchange. All version before 1.1.0. */
- if (r_software_version < 110) {
- SilcClientID id;
- memset(&id, 0, sizeof(id));
- id.ip.data_len = 4;
- SILC_LOG_DEBUG(("Remote is old version, add dummy Source ID to packets"));
- silc_packet_set_ids(ske->stream, SILC_ID_CLIENT, &id, 0, NULL);
- }
-
return SILC_SKE_STATUS_OK;
}
{
SilcSKEStatus status = SILC_SKE_STATUS_OK;
SilcBuffer buf;
- unsigned char *e, *f, *KEY;
- SilcUInt32 e_len, f_len, KEY_len;
+ unsigned char *e, *f, *KEY, *s_data;
+ SilcUInt32 e_len, f_len, KEY_len, s_len;
int ret;
SILC_LOG_DEBUG(("Start"));
if (initiator == FALSE) {
+ s_data = (ske->start_payload_copy ?
+ silc_buffer_data(ske->start_payload_copy) : NULL);
+ s_len = (ske->start_payload_copy ?
+ silc_buffer_len(ske->start_payload_copy) : 0);
e = silc_mp_mp2bin(&ske->ke1_payload->x, 0, &e_len);
f = silc_mp_mp2bin(&ske->ke2_payload->x, 0, &f_len);
KEY = silc_mp_mp2bin(ske->KEY, 0, &KEY_len);
/* Format the buffer used to compute the hash value */
- buf = silc_buffer_alloc_size(silc_buffer_len(ske->start_payload_copy) +
+ buf = silc_buffer_alloc_size(s_len +
ske->ke2_payload->pk_len +
ske->ke1_payload->pk_len +
e_len + f_len + KEY_len);
if (!ske->ke1_payload->pk_data) {
ret =
silc_buffer_format(buf,
- SILC_STR_UI_XNSTRING(
- ske->start_payload_copy->data,
- silc_buffer_len(ske->start_payload_copy)),
- SILC_STR_UI_XNSTRING(ske->ke2_payload->pk_data,
- ske->ke2_payload->pk_len),
- SILC_STR_UI_XNSTRING(e, e_len),
- SILC_STR_UI_XNSTRING(f, f_len),
- SILC_STR_UI_XNSTRING(KEY, KEY_len),
+ SILC_STR_DATA(s_data, s_len),
+ SILC_STR_DATA(ske->ke2_payload->pk_data,
+ ske->ke2_payload->pk_len),
+ SILC_STR_DATA(e, e_len),
+ SILC_STR_DATA(f, f_len),
+ SILC_STR_DATA(KEY, KEY_len),
SILC_STR_END);
} else {
ret =
silc_buffer_format(buf,
- SILC_STR_UI_XNSTRING(
- ske->start_payload_copy->data,
- silc_buffer_len(ske->start_payload_copy)),
- SILC_STR_UI_XNSTRING(ske->ke2_payload->pk_data,
- ske->ke2_payload->pk_len),
- SILC_STR_UI_XNSTRING(ske->ke1_payload->pk_data,
- ske->ke1_payload->pk_len),
- SILC_STR_UI_XNSTRING(e, e_len),
- SILC_STR_UI_XNSTRING(f, f_len),
- SILC_STR_UI_XNSTRING(KEY, KEY_len),
+ SILC_STR_DATA(s_data, s_len),
+ SILC_STR_DATA(ske->ke2_payload->pk_data,
+ ske->ke2_payload->pk_len),
+ SILC_STR_DATA(ske->ke1_payload->pk_data,
+ ske->ke1_payload->pk_len),
+ SILC_STR_DATA(e, e_len),
+ SILC_STR_DATA(f, f_len),
+ SILC_STR_DATA(KEY, KEY_len),
SILC_STR_END);
}
if (ret == -1) {
silc_free(f);
silc_free(KEY);
} else {
+ s_data = (ske->start_payload_copy ?
+ silc_buffer_data(ske->start_payload_copy) : NULL);
+ s_len = (ske->start_payload_copy ?
+ silc_buffer_len(ske->start_payload_copy) : 0);
e = silc_mp_mp2bin(&ske->ke1_payload->x, 0, &e_len);
- buf = silc_buffer_alloc_size(silc_buffer_len(ske->start_payload_copy) +
- ske->ke1_payload->pk_len + e_len);
+ buf = silc_buffer_alloc_size(s_len + ske->ke1_payload->pk_len + e_len);
if (!buf)
return SILC_SKE_STATUS_OUT_OF_MEMORY;
/* Format the buffer used to compute the hash value */
ret =
silc_buffer_format(buf,
- SILC_STR_UI_XNSTRING(ske->start_payload_copy->data,
- silc_buffer_len(ske->start_payload_copy)),
- SILC_STR_UI_XNSTRING(ske->ke1_payload->pk_data,
- ske->ke1_payload->pk_len),
- SILC_STR_UI_XNSTRING(e, e_len),
+ SILC_STR_DATA(s_data, s_len),
+ SILC_STR_DATA(ske->ke1_payload->pk_data,
+ ske->ke1_payload->pk_len),
+ SILC_STR_DATA(e, e_len),
SILC_STR_END);
if (ret == -1) {
silc_buffer_free(buf);
return status;
}
+/* Generate rekey material */
+
+static SilcSKERekeyMaterial
+silc_ske_make_rekey_material(SilcSKE ske, SilcSKEKeyMaterial keymat)
+{
+ SilcSKERekeyMaterial rekey;
+ const char *hash;
+
+ /* Create rekey material */
+ rekey = silc_calloc(1, sizeof(*rekey));
+ if (!rekey)
+ return NULL;
+
+ if (ske->prop) {
+ if (ske->prop->group)
+ rekey->ske_group = silc_ske_group_get_number(ske->prop->group);
+ rekey->pfs = (ske->prop->flags & SILC_SKE_SP_FLAG_PFS ? TRUE : FALSE);
+ hash = silc_hash_get_name(ske->prop->hash);
+ rekey->hash = silc_memdup(hash, strlen(hash));
+ if (!rekey->hash)
+ return NULL;
+ }
+
+ if (rekey->pfs == FALSE) {
+ rekey->send_enc_key = silc_memdup(keymat->send_enc_key,
+ keymat->enc_key_len / 8);
+ if (!rekey->send_enc_key) {
+ silc_free(rekey);
+ return NULL;
+ }
+ rekey->enc_key_len = keymat->enc_key_len;
+ }
+
+ return rekey;
+}
+
/* Assembles security properties */
static SilcSKEStartPayload
if (ske->retry_count++ >= SILC_SKE_RETRY_COUNT ||
ske->aborted) {
- SILC_LOG_DEBUG(("Retry limit reached, packet was lost"));
+ SILC_LOG_DEBUG(("Retransmission limit reached, packet was lost"));
ske->retry_count = 0;
ske->retry_timer = SILC_SKE_RETRY_MIN;
silc_free(ske->retrans.data);
ske->retrans.data, ske->retrans.data_len);
}
+/* Install retransmission timer */
+
+static void silc_ske_install_retransmission(SilcSKE ske)
+{
+ if (!silc_packet_stream_is_udp(ske->stream))
+ return;
+
+ if (ske->retrans.data) {
+ SILC_LOG_DEBUG(("Installing retransmission timer %d secs",
+ ske->retry_timer));
+ silc_schedule_task_add_timeout(ske->schedule, silc_ske_packet_send_retry,
+ ske, ske->retry_timer, 0);
+ }
+ ske->retry_timer = ((ske->retry_timer * SILC_SKE_RETRY_MUL) +
+ (silc_rng_get_rn16(ske->rng) % SILC_SKE_RETRY_RAND));
+}
+
/* Sends SILC packet. Handles retransmissions with UDP streams. */
static SilcBool silc_ske_packet_send(SilcSKE ske,
ret = silc_packet_send(ske->stream, type, flags, data, data_len);
if (silc_packet_stream_is_udp(ske->stream) &&
- type != SILC_PACKET_FAILURE) {
+ type != SILC_PACKET_FAILURE && type != SILC_PACKET_REKEY) {
silc_free(ske->retrans.data);
ske->retrans.type = type;
ske->retrans.flags = flags;
ske->retrans.data = silc_memdup(data, data_len);
ske->retrans.data_len = data_len;
- if (ske->retrans.data) {
- SILC_LOG_DEBUG(("Installing retransmission timer %d secs",
- ske->retry_timer));
- silc_schedule_task_add_timeout(ske->schedule, silc_ske_packet_send_retry,
- ske, ske->retry_timer, 0);
- }
- ske->retry_timer = ((ske->retry_timer * SILC_SKE_RETRY_MUL) +
- (silc_rng_get_rn16(ske->rng) % SILC_SKE_RETRY_RAND));
+ silc_ske_install_retransmission(ske);
}
return ret;
}
+/* Calls completion callback. Completion is called always in this function
+ and must not be called anywhere else. */
+
+static void silc_ske_completion(SilcSKE ske)
+{
+ /* Call the completion callback */
+ if (!ske->freed && !ske->aborted && ske->callbacks->completed) {
+ if (ske->status != SILC_SKE_STATUS_OK)
+ ske->callbacks->completed(ske, ske->status, NULL, NULL, NULL,
+ ske->callbacks->context);
+ else
+ ske->callbacks->completed(ske, ske->status, ske->prop, ske->keymat,
+ ske->rekey, ske->callbacks->context);
+ }
+}
+
+/* SKE FSM destructor. */
+
+static void silc_ske_finished(SilcFSM fsm, void *fsm_context,
+ void *destructor_context)
+{
+ SilcSKE ske = fsm_context;
+ ske->running = FALSE;
+ if (ske->freed)
+ silc_ske_free(ske);
+}
+
+/* Key exchange timeout task callback */
+
+SILC_TASK_CALLBACK(silc_ske_timeout)
+{
+ SilcSKE ske = context;
+
+ SILC_LOG_DEBUG(("Timeout"));
+
+ ske->packet = NULL;
+ ske->status = SILC_SKE_STATUS_TIMEOUT;
+ if (ske->responder)
+ silc_fsm_next(&ske->fsm, silc_ske_st_responder_failure);
+ else
+ silc_fsm_next(&ske->fsm, silc_ske_st_initiator_failure);
+
+ silc_fsm_continue_sync(&ske->fsm);
+}
/******************************* Protocol API *******************************/
ske->public_key = public_key;
ske->private_key = private_key;
ske->retry_timer = SILC_SKE_RETRY_MIN;
+ ske->refcnt = 1;
return ske;
}
if (ske->running) {
ske->freed = TRUE;
+
+ if (ske->aborted) {
+ /* If already aborted, destroy the session immediately */
+ ske->packet = NULL;
+ ske->status = SILC_SKE_STATUS_ERROR;
+ if (ske->responder)
+ silc_fsm_next(&ske->fsm, silc_ske_st_responder_failure);
+ else
+ silc_fsm_next(&ske->fsm, silc_ske_st_initiator_failure);
+ silc_fsm_continue_sync(&ske->fsm);
+ }
return;
}
+ ske->refcnt--;
+ if (ske->refcnt > 0)
+ return;
+
/* Free start payload */
if (ske->start_payload)
silc_ske_payload_start_free(ske->start_payload);
silc_hash_free(ske->prop->hash);
if (ske->prop->hmac)
silc_hmac_free(ske->prop->hmac);
- silc_free(ske->prop);
+ if (ske->prop->public_key)
+ silc_pkcs_public_key_free(ske->prop->public_key);
+ silc_free(ske->prop);
}
+ if (ske->keymat)
+ silc_ske_free_key_material(ske->keymat);
if (ske->start_payload_copy)
silc_buffer_free(ske->start_payload_copy);
if (ske->x) {
return SILC_FSM_CONTINUE;
}
- /* XXX timeout */
+ /* Add key exchange timeout */
+ silc_schedule_task_add_timeout(ske->schedule, silc_ske_timeout,
+ ske, ske->timeout, 0);
/** Wait for responder proposal */
- SILC_LOG_DEBUG(("Waiting for reponder proposal"));
+ SILC_LOG_DEBUG(("Waiting for responder proposal"));
silc_fsm_next(fsm, silc_ske_st_initiator_phase1);
return SILC_FSM_WAIT;
}
SILC_LOG_DEBUG(("Start"));
- ske->retry_timer = SILC_SKE_RETRY_MIN;
- silc_schedule_task_del_by_context(ske->schedule, ske);
-
- if (ske->aborted) {
- /** Aborted */
- silc_packet_free(ske->packet);
- ske->packet = NULL;
- silc_fsm_next(fsm, silc_ske_st_initiator_aborted);
- return SILC_FSM_CONTINUE;
- }
-
- /* See if received failure from remote */
- if (ske->packet->type == SILC_PACKET_FAILURE) {
- silc_fsm_next(fsm, silc_ske_st_initiator_failure);
- return SILC_FSM_CONTINUE;
- }
-
if (ske->packet->type != SILC_PACKET_KEY_EXCHANGE) {
SILC_LOG_DEBUG(("Remote retransmitted an old packet"));
+ silc_ske_install_retransmission(ske);
silc_packet_free(ske->packet);
ske->packet = NULL;
return SILC_FSM_WAIT;
payload->pk_type = silc_pkcs_get_type(ske->public_key);
/* Compute signature data if we are doing mutual authentication */
- if (ske->private_key &&
- ske->start_payload->flags & SILC_SKE_SP_FLAG_MUTUAL) {
+ if (ske->private_key && ske->prop->flags & SILC_SKE_SP_FLAG_MUTUAL) {
unsigned char hash[SILC_HASH_MAXLEN], sign[2048 + 1];
SilcUInt32 hash_len, sign_len;
/* Sign the hash value */
if (!silc_pkcs_sign(ske->private_key, hash, hash_len, sign,
- sizeof(sign) - 1, &sign_len, NULL)) {
+ sizeof(sign) - 1, &sign_len, FALSE, ske->prop->hash)) {
/** Error computing signature */
silc_mp_uninit(x);
silc_free(x);
SILC_LOG_DEBUG(("Start"));
- ske->retry_timer = SILC_SKE_RETRY_MIN;
- silc_schedule_task_del_by_context(ske->schedule, ske);
-
- if (ske->aborted) {
- /** Aborted */
- silc_packet_free(ske->packet);
- ske->packet = NULL;
- silc_fsm_next(fsm, silc_ske_st_initiator_aborted);
- return SILC_FSM_CONTINUE;
- }
-
- /* See if received failure from remote */
- if (ske->packet->type == SILC_PACKET_FAILURE) {
- silc_fsm_next(fsm, silc_ske_st_initiator_failure);
- return SILC_FSM_CONTINUE;
- }
-
if (ske->packet->type != SILC_PACKET_KEY_EXCHANGE_2) {
SILC_LOG_DEBUG(("Remote retransmitted an old packet"));
+ silc_ske_install_retransmission(ske);
silc_packet_free(ske->packet);
ske->packet = NULL;
return SILC_FSM_WAIT;
silc_skr_find_set_usage(find, SILC_SKR_USAGE_KEY_AGREEMENT);
/* Find key from repository */
- SILC_FSM_CALL(silc_skr_find(ske->repository, find,
- silc_ske_skr_callback, ske));
+ SILC_FSM_CALL(silc_skr_find(ske->repository, silc_fsm_get_schedule(fsm),
+ find, silc_ske_skr_callback, ske));
} else {
/* Verify from application */
SILC_FSM_CALL(ske->callbacks->verify_key(ske, ske->prop->public_key,
payload = ske->ke2_payload;
+ /* Compute the HASH value */
+ SILC_LOG_DEBUG(("Computing HASH value"));
+ status = silc_ske_make_hash(ske, hash, &hash_len, FALSE);
+ if (status != SILC_SKE_STATUS_OK)
+ goto err;
+ ske->hash = silc_memdup(hash, hash_len);
+ ske->hash_len = hash_len;
+
if (ske->prop->public_key) {
SILC_LOG_DEBUG(("Public key is authentic"));
-
- /* Compute the hash value */
- status = silc_ske_make_hash(ske, hash, &hash_len, FALSE);
- if (status != SILC_SKE_STATUS_OK)
- goto err;
-
SILC_LOG_DEBUG(("Verifying signature (HASH)"));
/* Verify signature */
}
SILC_LOG_DEBUG(("Signature is Ok"));
-
- ske->hash = silc_memdup(hash, hash_len);
- ske->hash_len = hash_len;
memset(hash, 'F', hash_len);
}
ske->status = SILC_SKE_STATUS_OK;
+ /* In case we are doing rekey move to finish it. */
+ if (ske->rekey) {
+ /** Finish rekey */
+ silc_fsm_next(fsm, silc_ske_st_rekey_initiator_done);
+ return SILC_FSM_CONTINUE;
+ }
+
/* Process key material */
key_len = silc_cipher_get_key_len(ske->prop->cipher);
- block_len = silc_cipher_get_key_len(ske->prop->cipher);
+ block_len = silc_cipher_get_block_len(ske->prop->cipher);
hash_len = silc_hash_len(ske->prop->hash);
ske->keymat = silc_ske_process_key_material(ske, block_len,
- key_len, hash_len);
+ key_len, hash_len,
+ &ske->rekey);
if (!ske->keymat) {
SILC_LOG_ERROR(("Error processing key material"));
status = SILC_SKE_STATUS_ERROR;
SILC_LOG_DEBUG(("Start"));
- ske->retry_timer = SILC_SKE_RETRY_MIN;
- silc_schedule_task_del_by_context(ske->schedule, ske);
-
- if (ske->aborted) {
- /** Aborted */
- silc_fsm_next(fsm, silc_ske_st_initiator_aborted);
- return SILC_FSM_CONTINUE;
- }
-
- /* See if received failure from remote */
- if (ske->packet->type == SILC_PACKET_FAILURE) {
- silc_fsm_next(fsm, silc_ske_st_initiator_failure);
- return SILC_FSM_CONTINUE;
- }
-
if (ske->packet->type != SILC_PACKET_SUCCESS) {
SILC_LOG_DEBUG(("Remote retransmitted an old packet"));
+ silc_ske_install_retransmission(ske);
silc_packet_free(ske->packet);
ske->packet = NULL;
return SILC_FSM_WAIT;
SILC_LOG_DEBUG(("Key exchange completed successfully"));
- /* Call the completion callback */
- if (ske->callbacks->completed)
- ske->callbacks->completed(ske, ske->status, ske->prop, ske->keymat,
- ske->rekey, ske->callbacks->context);
-
silc_packet_free(ske->packet);
ske->packet = NULL;
silc_packet_stream_unlink(ske->stream, &silc_ske_stream_cbs, ske);
silc_schedule_task_del_by_context(ske->schedule, ske);
+ /* Call completion */
+ silc_ske_completion(ske);
+
return SILC_FSM_FINISH;
}
/* Send FAILURE packet */
SILC_PUT32_MSB(SILC_SKE_STATUS_ERROR, data);
silc_ske_packet_send(ske, SILC_PACKET_FAILURE, 0, data, 4);
+
silc_packet_stream_unlink(ske->stream, &silc_ske_stream_cbs, ske);
silc_schedule_task_del_by_context(ske->schedule, ske);
+ /* Call completion */
+ silc_ske_completion(ske);
+
return SILC_FSM_FINISH;
}
SILC_PUT32_MSB((SilcUInt32)status, data);
silc_ske_packet_send(ske, SILC_PACKET_FAILURE, 0, data, 4);
- /* Call the completion callback */
- if (!ske->aborted && ske->callbacks->completed)
- ske->callbacks->completed(ske, ske->status, NULL, NULL, NULL,
- ske->callbacks->context);
-
silc_packet_stream_unlink(ske->stream, &silc_ske_stream_cbs, ske);
silc_schedule_task_del_by_context(ske->schedule, ske);
+ /* Call completion */
+ silc_ske_completion(ske);
+
return SILC_FSM_FINISH;
}
SilcSKE ske = fsm_context;
SilcUInt32 error = SILC_SKE_STATUS_ERROR;
- SILC_LOG_DEBUG(("Error %s (%d) received during key exchange",
- silc_ske_map_status(ske->status), ske->status));
-
if (ske->packet && silc_buffer_len(&ske->packet->buffer) == 4) {
SILC_GET32_MSB(error, ske->packet->buffer.data);
ske->status = error;
ske->packet = NULL;
}
- /* Call the completion callback */
- if (!ske->aborted && ske->callbacks->completed)
- ske->callbacks->completed(ske, ske->status, NULL, NULL, NULL,
- ske->callbacks->context);
+ SILC_LOG_DEBUG(("Error %s (%d) received during key exchange",
+ silc_ske_map_status(ske->status), ske->status));
silc_packet_stream_unlink(ske->stream, &silc_ske_stream_cbs, ske);
silc_schedule_task_del_by_context(ske->schedule, ske);
- return SILC_FSM_FINISH;
-}
-
-/* FSM destructor */
+ /* Call completion */
+ silc_ske_completion(ske);
-static void silc_ske_initiator_finished(SilcFSM fsm, void *fsm_context,
- void *destructor_context)
-{
- SilcSKE ske = fsm_context;
-
- ske->running = FALSE;
- if (ske->freed)
- silc_ske_free(ske);
+ return SILC_FSM_FINISH;
}
/* Starts the protocol as initiator */
-SilcAsyncOperation
-silc_ske_initiator(SilcSKE ske,
- SilcPacketStream stream,
- SilcSKEParams params,
- SilcSKEStartPayload start_payload)
+SilcAsyncOperation silc_ske_initiator(SilcSKE ske,
+ SilcPacketStream stream,
+ SilcSKEParams params,
+ SilcSKEStartPayload start_payload)
{
SILC_LOG_DEBUG(("Start SKE as initiator"));
if (!silc_async_init(&ske->op, silc_ske_abort, NULL, ske))
return NULL;
- if (!silc_fsm_init(&ske->fsm, ske, silc_ske_initiator_finished, ske,
- ske->schedule))
+ if (!silc_fsm_init(&ske->fsm, ske, silc_ske_finished, ske, ske->schedule))
return NULL;
if (params->flags & SILC_SKE_SP_FLAG_IV_INCLUDED)
return NULL;
}
+ ske->timeout = params->timeout_secs ? params->timeout_secs : 30;
ske->start_payload = start_payload;
ske->version = params->version;
ske->running = TRUE;
return SILC_FSM_CONTINUE;
}
- /* Start timeout */
- /* XXX */
+ /* Add key exchange timeout */
+ silc_schedule_task_add_timeout(ske->schedule, silc_ske_timeout,
+ ske, ske->timeout, 0);
/** Wait for initiator */
silc_fsm_next(fsm, silc_ske_st_responder_phase1);
SilcSKEStatus status;
SilcSKEStartPayload remote_payload = NULL;
SilcBuffer packet_buf = &ske->packet->buffer;
+ SilcID id;
SILC_LOG_DEBUG(("Start"));
- if (ske->aborted) {
- /** Aborted */
- silc_packet_free(ske->packet);
- ske->packet = NULL;
- silc_fsm_next(fsm, silc_ske_st_responder_aborted);
- return SILC_FSM_CONTINUE;
- }
-
- /* See if received failure from remote */
- if (ske->packet->type == SILC_PACKET_FAILURE) {
- silc_fsm_next(fsm, silc_ske_st_responder_failure);
- return SILC_FSM_CONTINUE;
- }
-
/* Decode the payload */
status = silc_ske_payload_start_decode(ske, packet_buf, &remote_payload);
if (status != SILC_SKE_STATUS_OK) {
return SILC_FSM_CONTINUE;
}
+ /* Get remote ID and set it to stream */
+ if (ske->packet->src_id_len) {
+ silc_id_str2id(ske->packet->src_id, ske->packet->src_id_len,
+ ske->packet->src_id_type,
+ (ske->packet->src_id_type == SILC_ID_SERVER ?
+ (void *)&id.u.server_id : (void *)&id.u.client_id),
+ (ske->packet->src_id_type == SILC_ID_SERVER ?
+ sizeof(id.u.server_id) : sizeof(id.u.client_id)));
+ silc_packet_set_ids(ske->stream, 0, NULL, ske->packet->src_id_type,
+ (ske->packet->src_id_type == SILC_ID_SERVER ?
+ (void *)&id.u.server_id : (void *)&id.u.client_id));
+ }
+
/* Take a copy of the payload buffer for future use. It is used to
compute the HASH value. */
ske->start_payload_copy = silc_buffer_copy(packet_buf);
SILC_LOG_DEBUG(("Start"));
- ske->retry_timer = SILC_SKE_RETRY_MIN;
- silc_schedule_task_del_by_context(ske->schedule, ske);
-
- if (ske->aborted) {
- /** Aborted */
- silc_fsm_next(fsm, silc_ske_st_responder_aborted);
- return SILC_FSM_CONTINUE;
- }
-
- /* See if received failure from remote */
- if (ske->packet->type == SILC_PACKET_FAILURE) {
- silc_fsm_next(fsm, silc_ske_st_responder_failure);
- return SILC_FSM_CONTINUE;
- }
-
if (ske->packet->type != SILC_PACKET_KEY_EXCHANGE_1) {
SILC_LOG_DEBUG(("Remote retransmitted an old packet"));
+ silc_ske_install_retransmission(ske);
silc_packet_free(ske->packet);
ske->packet = NULL;
return SILC_FSM_WAIT;
silc_packet_free(ske->packet);
ske->packet = NULL;
- /* Verify the received public key and verify the signature if we are
- doing mutual authentication. */
- if (ske->start_payload &&
- ske->start_payload->flags & SILC_SKE_SP_FLAG_MUTUAL) {
-
- SILC_LOG_DEBUG(("We are doing mutual authentication"));
-
- if (!recv_payload->pk_data && (ske->callbacks->verify_key ||
- ske->repository)) {
+ /* Verify public key, except in rekey, when it is not sent */
+ if (!ske->rekey) {
+ if (!recv_payload->pk_data) {
/** Public key not provided */
SILC_LOG_ERROR(("Remote end did not send its public key (or "
"certificate), even though we require it"));
}
/* Decode the remote's public key */
- if (recv_payload->pk_data &&
- !silc_pkcs_public_key_alloc(recv_payload->pk_type,
+ if (!silc_pkcs_public_key_alloc(recv_payload->pk_type,
recv_payload->pk_data,
recv_payload->pk_len,
&ske->prop->public_key)) {
return SILC_FSM_CONTINUE;
}
- if (ske->prop->public_key && (ske->callbacks->verify_key ||
- ske->repository)) {
- SILC_LOG_DEBUG(("Verifying public key"));
+ SILC_LOG_DEBUG(("Verifying public key"));
- /** Waiting public key verification */
- silc_fsm_next(fsm, silc_ske_st_responder_phase4);
+ /** Waiting public key verification */
+ silc_fsm_next(fsm, silc_ske_st_responder_phase4);
- /* If repository is provided, verify the key from there. */
- if (ske->repository) {
- SilcSKRFind find;
+ /* If repository is provided, verify the key from there. */
+ if (ske->repository) {
+ SilcSKRFind find;
- find = silc_skr_find_alloc();
- if (!find) {
- ske->status = SILC_SKE_STATUS_OUT_OF_MEMORY;
- silc_fsm_next(fsm, silc_ske_st_responder_error);
- return SILC_FSM_CONTINUE;
- }
- silc_skr_find_set_pkcs_type(find,
- silc_pkcs_get_type(ske->prop->public_key));
- silc_skr_find_set_public_key(find, ske->prop->public_key);
- silc_skr_find_set_usage(find, SILC_SKR_USAGE_KEY_AGREEMENT);
-
- /* Find key from repository */
- SILC_FSM_CALL(silc_skr_find(ske->repository, find,
- silc_ske_skr_callback, ske));
- } else {
- /* Verify from application */
+ find = silc_skr_find_alloc();
+ if (!find) {
+ ske->status = SILC_SKE_STATUS_OUT_OF_MEMORY;
+ silc_fsm_next(fsm, silc_ske_st_responder_error);
+ return SILC_FSM_CONTINUE;
+ }
+ silc_skr_find_set_pkcs_type(find,
+ silc_pkcs_get_type(ske->prop->public_key));
+ silc_skr_find_set_public_key(find, ske->prop->public_key);
+ silc_skr_find_set_usage(find, SILC_SKR_USAGE_KEY_AGREEMENT);
+
+ /* Find key from repository */
+ SILC_FSM_CALL(silc_skr_find(ske->repository,
+ silc_fsm_get_schedule(fsm), find,
+ silc_ske_skr_callback, ske));
+ } else {
+ /* Verify from application */
+ if (ske->callbacks->verify_key)
SILC_FSM_CALL(ske->callbacks->verify_key(ske, ske->prop->public_key,
ske->callbacks->context,
silc_ske_pk_verified, NULL));
- }
- /* NOT REACHED */
}
}
unsigned char hash[SILC_HASH_MAXLEN];
SilcUInt32 hash_len;
- SILC_LOG_DEBUG(("Public key is authentic"));
+ SILC_LOG_DEBUG(("We are doing mutual authentication"));
/* Compute the hash value */
status = silc_ske_make_hash(ske, hash, &hash_len, TRUE);
}
ske->ke2_payload->pk_data = pk;
ske->ke2_payload->pk_len = pk_len;
+ }
- SILC_LOG_DEBUG(("Computing HASH value"));
-
- /* Compute the hash value */
- memset(hash, 0, sizeof(hash));
- status = silc_ske_make_hash(ske, hash, &hash_len, FALSE);
- if (status != SILC_SKE_STATUS_OK) {
- /** Error computing hash */
- ske->status = status;
- silc_fsm_next(fsm, silc_ske_st_responder_error);
- return SILC_FSM_CONTINUE;
- }
+ SILC_LOG_DEBUG(("Computing HASH value"));
- ske->hash = silc_memdup(hash, hash_len);
- ske->hash_len = hash_len;
+ /* Compute the hash value */
+ memset(hash, 0, sizeof(hash));
+ status = silc_ske_make_hash(ske, hash, &hash_len, FALSE);
+ if (status != SILC_SKE_STATUS_OK) {
+ /** Error computing hash */
+ ske->status = status;
+ silc_fsm_next(fsm, silc_ske_st_responder_error);
+ return SILC_FSM_CONTINUE;
+ }
+ ske->hash = silc_memdup(hash, hash_len);
+ ske->hash_len = hash_len;
+ if (ske->public_key && ske->private_key) {
SILC_LOG_DEBUG(("Signing HASH value"));
/* Sign the hash value */
if (!silc_pkcs_sign(ske->private_key, hash, hash_len, sign,
- sizeof(sign) - 1, &sign_len, NULL)) {
+ sizeof(sign) - 1, &sign_len, FALSE, ske->prop->hash)) {
/** Error computing signature */
status = SILC_SKE_STATUS_SIGNATURE_ERROR;
silc_fsm_next(fsm, silc_ske_st_responder_error);
silc_buffer_free(payload_buf);
+ /* In case we are doing rekey move to finish it. */
+ if (ske->rekey) {
+ /** Finish rekey */
+ silc_fsm_next(fsm, silc_ske_st_rekey_responder_done);
+ return SILC_FSM_CONTINUE;
+ }
+
/** Waiting completion */
silc_fsm_next(fsm, silc_ske_st_responder_end);
return SILC_FSM_WAIT;
unsigned char tmp[4];
SilcUInt32 hash_len, key_len, block_len;
- ske->retry_timer = SILC_SKE_RETRY_MIN;
- silc_schedule_task_del_by_context(ske->schedule, ske);
-
- if (ske->aborted) {
- /** Aborted */
- silc_fsm_next(fsm, silc_ske_st_responder_aborted);
- return SILC_FSM_CONTINUE;
- }
-
- /* Check the result of the protocol */
- if (ske->packet->type == SILC_PACKET_FAILURE) {
- silc_fsm_next(fsm, silc_ske_st_responder_failure);
- return SILC_FSM_CONTINUE;
- }
-
if (ske->packet->type != SILC_PACKET_SUCCESS) {
SILC_LOG_DEBUG(("Remote retransmitted an old packet"));
+ silc_ske_install_retransmission(ske);
silc_packet_free(ske->packet);
ske->packet = NULL;
return SILC_FSM_WAIT;
/* Process key material */
key_len = silc_cipher_get_key_len(ske->prop->cipher);
- block_len = silc_cipher_get_key_len(ske->prop->cipher);
+ block_len = silc_cipher_get_block_len(ske->prop->cipher);
hash_len = silc_hash_len(ske->prop->hash);
ske->keymat = silc_ske_process_key_material(ske, block_len,
- key_len, hash_len);
+ key_len, hash_len,
+ &ske->rekey);
if (!ske->keymat) {
/** Error processing key material */
ske->status = SILC_SKE_STATUS_ERROR;
silc_packet_stream_unlink(ske->stream, &silc_ske_stream_cbs, ske);
silc_schedule_task_del_by_context(ske->schedule, ske);
- /* Call the completion callback */
- if (ske->callbacks->completed)
- ske->callbacks->completed(ske, ske->status, ske->prop, ske->keymat,
- ske->rekey, ske->callbacks->context);
+ /* Call completion */
+ silc_ske_completion(ske);
return SILC_FSM_FINISH;
}
silc_packet_stream_unlink(ske->stream, &silc_ske_stream_cbs, ske);
silc_schedule_task_del_by_context(ske->schedule, ske);
+ /* Call completion */
+ silc_ske_completion(ske);
+
return SILC_FSM_FINISH;
}
ske->packet = NULL;
}
- /* Call the completion callback */
- if (!ske->aborted && ske->callbacks->completed)
- ske->callbacks->completed(ske, ske->status, NULL, NULL, NULL,
- ske->callbacks->context);
-
silc_packet_stream_unlink(ske->stream, &silc_ske_stream_cbs, ske);
silc_schedule_task_del_by_context(ske->schedule, ske);
+ /* Call completion */
+ silc_ske_completion(ske);
+
return SILC_FSM_FINISH;
}
ske->status = SILC_SKE_STATUS_BAD_PAYLOAD;
SILC_PUT32_MSB(ske->status, tmp);
silc_ske_packet_send(ske, SILC_PACKET_FAILURE, 0, tmp, 4);
+
silc_packet_stream_unlink(ske->stream, &silc_ske_stream_cbs, ske);
silc_schedule_task_del_by_context(ske->schedule, ske);
- return SILC_FSM_FINISH;
-}
-
+ /* Call completion */
+ silc_ske_completion(ske);
-static void silc_ske_responder_finished(SilcFSM fsm, void *fsm_context,
- void *destructor_context)
-{
- SilcSKE ske = fsm_context;
-
- ske->running = FALSE;
- if (ske->freed)
- silc_ske_free(ske);
+ return SILC_FSM_FINISH;
}
/* Starts the protocol as responder. */
-SilcAsyncOperation
-silc_ske_responder(SilcSKE ske,
- SilcPacketStream stream,
- SilcSKEParams params)
+SilcAsyncOperation silc_ske_responder(SilcSKE ske,
+ SilcPacketStream stream,
+ SilcSKEParams params)
{
SILC_LOG_DEBUG(("Start SKE as responder"));
- if (!ske || !stream || !params || !params->version) {
+ if (!ske || !stream || !params || !params->version)
return NULL;
- }
if (!silc_async_init(&ske->op, silc_ske_abort, NULL, ske))
return NULL;
- if (!silc_fsm_init(&ske->fsm, ske, silc_ske_responder_finished, ske,
- ske->schedule))
+ if (!silc_fsm_init(&ske->fsm, ske, silc_ske_finished, ske, ske->schedule))
return NULL;
ske->responder = TRUE;
ske->flags = params->flags;
+ ske->timeout = params->timeout_secs ? params->timeout_secs : 30;
if (ske->flags & SILC_SKE_SP_FLAG_IV_INCLUDED)
ske->session_port = params->session_port;
ske->version = strdup(params->version);
return &ske->op;
}
-SILC_FSM_STATE(silc_ske_st_rekey_initiator_start);
+/***************************** Initiator Rekey ******************************/
+
+/* Start rekey */
SILC_FSM_STATE(silc_ske_st_rekey_initiator_start)
{
+ SilcSKE ske = fsm_context;
+ SilcStatus status;
+
+ SILC_LOG_DEBUG(("Start rekey (%s)", ske->rekey->pfs ? "PFS" : "No PFS"));
+
+ if (ske->aborted) {
+ /** Aborted */
+ silc_fsm_next(fsm, silc_ske_st_initiator_aborted);
+ return SILC_FSM_CONTINUE;
+ }
+
+ /* Add rekey exchange timeout */
+ silc_schedule_task_add_timeout(ske->schedule, silc_ske_timeout,
+ ske, 30, 0);
+
+ ske->prop = silc_calloc(1, sizeof(*ske->prop));
+ if (!ske->prop) {
+ /** No memory */
+ ske->status = SILC_SKE_STATUS_OUT_OF_MEMORY;
+ silc_fsm_next(fsm, silc_ske_st_initiator_error);
+ return SILC_FSM_CONTINUE;
+ }
+
+ if (!silc_hash_alloc(ske->rekey->hash, &ske->prop->hash)) {
+ /** Cannot allocate hash */
+ ske->status = SILC_SKE_STATUS_OUT_OF_MEMORY;
+ silc_fsm_next(fsm, silc_ske_st_initiator_error);
+ return SILC_FSM_CONTINUE;
+ }
+
+ /* Send REKEY packet to start rekey protocol */
+ if (!silc_ske_packet_send(ske, SILC_PACKET_REKEY, 0, NULL, 0)) {
+ /** Error sending packet */
+ SILC_LOG_DEBUG(("Error sending packet"));
+ ske->status = SILC_SKE_STATUS_ERROR;
+ silc_fsm_next(fsm, silc_ske_st_initiator_error);
+ return SILC_FSM_CONTINUE;
+ }
+
+ /* If doing rekey without PFS, move directly to the end of the protocol. */
+ if (!ske->rekey->pfs) {
+ /** Rekey without PFS */
+ silc_fsm_next(fsm, silc_ske_st_rekey_initiator_done);
+ return SILC_FSM_CONTINUE;
+ }
+
+ status = silc_ske_group_get_by_number(ske->rekey->ske_group,
+ &ske->prop->group);
+ if (status != SILC_SKE_STATUS_OK) {
+ /** Unknown group */
+ silc_fsm_next(fsm, silc_ske_st_initiator_error);
+ return SILC_FSM_CONTINUE;
+ }
+
+ /** Rekey with PFS */
+ silc_fsm_next(fsm, silc_ske_st_initiator_phase2);
+ return SILC_FSM_CONTINUE;
+}
+
+/* Sends REKEY_DONE packet to finish the protocol. */
+
+SILC_FSM_STATE(silc_ske_st_rekey_initiator_done)
+{
+ SilcSKE ske = fsm_context;
+ SilcCipher send_key;
+ SilcHmac hmac_send;
+ SilcHash hash;
+ SilcUInt32 key_len, block_len, hash_len, x_len;
+ unsigned char *pfsbuf;
+
+ SILC_LOG_DEBUG(("Start"));
+
+ silc_packet_get_keys(ske->stream, &send_key, NULL, &hmac_send, NULL);
+ key_len = silc_cipher_get_key_len(send_key);
+ block_len = silc_cipher_get_block_len(send_key);
+ hash = ske->prop->hash;
+ hash_len = silc_hash_len(hash);
+
+ /* Process key material */
+ if (ske->rekey->pfs) {
+ /* PFS */
+ pfsbuf = silc_mp_mp2bin(ske->KEY, 0, &x_len);
+ if (pfsbuf) {
+ ske->keymat = silc_ske_process_key_material_data(pfsbuf, x_len,
+ block_len, key_len,
+ hash_len, hash);
+ memset(pfsbuf, 0, x_len);
+ silc_free(pfsbuf);
+ }
+ } else {
+ /* No PFS */
+ ske->keymat =
+ silc_ske_process_key_material_data(ske->rekey->send_enc_key,
+ ske->rekey->enc_key_len / 8,
+ block_len, key_len,
+ hash_len, hash);
+ }
+
+ if (!ske->keymat) {
+ SILC_LOG_ERROR(("Error processing key material"));
+ silc_fsm_next(fsm, silc_ske_st_initiator_error);
+ return SILC_FSM_CONTINUE;
+ }
+
+ ske->prop->cipher = send_key;
+ ske->prop->hmac = hmac_send;
+
+ /* Get sending keys */
+ if (!silc_ske_set_keys(ske, ske->keymat, ske->prop, &send_key, NULL,
+ &hmac_send, NULL, NULL)) {
+ /** Cannot get keys */
+ ske->status = SILC_SKE_STATUS_ERROR;
+ ske->prop->cipher = NULL;
+ ske->prop->hmac = NULL;
+ silc_fsm_next(fsm, silc_ske_st_initiator_error);
+ return SILC_FSM_CONTINUE;
+ }
+
+ ske->prop->cipher = NULL;
+ ske->prop->hmac = NULL;
+
+ /* Set the new keys into use. This will also send REKEY_DONE packet. Any
+ packet sent after this call will be protected with the new keys. */
+ if (!silc_packet_set_keys(ske->stream, send_key, NULL, hmac_send, NULL,
+ TRUE)) {
+ /** Cannot set keys */
+ SILC_LOG_DEBUG(("Cannot set new keys, error sending REKEY_DONE"));
+ ske->status = SILC_SKE_STATUS_ERROR;
+ silc_cipher_free(send_key);
+ silc_hmac_free(hmac_send);
+ silc_fsm_next(fsm, silc_ske_st_initiator_error);
+ return SILC_FSM_CONTINUE;
+ }
+
+ /** Wait for REKEY_DONE */
+ silc_fsm_next(fsm, silc_ske_st_rekey_initiator_end);
+ return SILC_FSM_WAIT;
+}
+
+/* Rekey protocol end */
+
+SILC_FSM_STATE(silc_ske_st_rekey_initiator_end)
+{
+ SilcSKE ske = fsm_context;
+ SilcCipher receive_key;
+ SilcHmac hmac_receive;
+ SilcSKERekeyMaterial rekey;
+
+ SILC_LOG_DEBUG(("Start"));
+
+ if (ske->packet->type != SILC_PACKET_REKEY_DONE) {
+ SILC_LOG_DEBUG(("Remote retransmitted an old packet"));
+ silc_packet_free(ske->packet);
+ ske->packet = NULL;
+ return SILC_FSM_WAIT;
+ }
+
+ silc_packet_get_keys(ske->stream, NULL, &receive_key, NULL, &hmac_receive);
+ ske->prop->cipher = receive_key;
+ ske->prop->hmac = hmac_receive;
+
+ /* Get receiving keys */
+ if (!silc_ske_set_keys(ske, ske->keymat, ske->prop, NULL, &receive_key,
+ NULL, &hmac_receive, NULL)) {
+ /** Cannot get keys */
+ ske->status = SILC_SKE_STATUS_ERROR;
+ ske->prop->cipher = NULL;
+ ske->prop->hmac = NULL;
+ silc_fsm_next(fsm, silc_ske_st_initiator_error);
+ return SILC_FSM_CONTINUE;
+ }
+
+ /* Set new receiving keys into use. All packets received after this will
+ be decrypted with the new keys. */
+ if (!silc_packet_set_keys(ske->stream, NULL, receive_key, NULL,
+ hmac_receive, FALSE)) {
+ /** Cannot set keys */
+ SILC_LOG_DEBUG(("Cannot set new keys"));
+ ske->status = SILC_SKE_STATUS_ERROR;
+ silc_cipher_free(receive_key);
+ silc_hmac_free(hmac_receive);
+ silc_fsm_next(fsm, silc_ske_st_initiator_error);
+ return SILC_FSM_CONTINUE;
+ }
+
+ SILC_LOG_DEBUG(("Rekey completed successfully"));
+
+ /* Generate new rekey material */
+ rekey = silc_ske_make_rekey_material(ske, ske->keymat);
+ if (!rekey) {
+ /** No memory */
+ ske->status = SILC_SKE_STATUS_OUT_OF_MEMORY;
+ ske->prop->cipher = NULL;
+ ske->prop->hmac = NULL;
+ silc_fsm_next(fsm, silc_ske_st_initiator_error);
+ return SILC_FSM_CONTINUE;
+ }
+ rekey->pfs = ske->rekey->pfs;
+ ske->rekey = rekey;
+
+ ske->prop->cipher = NULL;
+ ske->prop->hmac = NULL;
+ silc_packet_free(ske->packet);
+ ske->packet = NULL;
+ silc_packet_stream_unlink(ske->stream, &silc_ske_stream_cbs, ske);
+ silc_schedule_task_del_by_context(ske->schedule, ske);
+
+ /* Call completion */
+ silc_ske_completion(ske);
+
return SILC_FSM_FINISH;
}
{
SILC_LOG_DEBUG(("Start SKE rekey as initator"));
- if (!ske || !stream || !rekey)
+ if (!ske || !stream || !rekey) {
+ SILC_LOG_ERROR(("Missing arguments to silc_ske_rekey_initiator"));
+ SILC_ASSERT(rekey);
return NULL;
+ }
if (!silc_async_init(&ske->op, silc_ske_abort, NULL, ske))
return NULL;
- if (!silc_fsm_init(&ske->fsm, ske, NULL, NULL, ske->schedule))
+ if (!silc_fsm_init(&ske->fsm, ske, silc_ske_finished, ske, ske->schedule))
return NULL;
ske->rekey = rekey;
+ ske->responder = FALSE;
+ ske->running = TRUE;
+ ske->rekeying = TRUE;
/* Link to packet stream to get key exchange packets */
ske->stream = stream;
+ silc_packet_stream_link(ske->stream, &silc_ske_stream_cbs, ske, 1000000,
+ SILC_PACKET_REKEY,
+ SILC_PACKET_REKEY_DONE,
+ SILC_PACKET_KEY_EXCHANGE_2,
+ SILC_PACKET_SUCCESS,
+ SILC_PACKET_FAILURE, -1);
/* Start SKE rekey as initiator */
silc_fsm_start(&ske->fsm, silc_ske_st_rekey_initiator_start);
return &ske->op;
}
-SILC_FSM_STATE(silc_ske_st_rekey_responder_start);
+/***************************** Responder Rekey ******************************/
+
+/* Wait for initiator's packet */
+
+SILC_FSM_STATE(silc_ske_st_rekey_responder_wait)
+{
+ SilcSKE ske = fsm_context;
+
+ SILC_LOG_DEBUG(("Start rekey (%s)", ske->rekey->pfs ? "PFS" : "No PFS"));
+
+ if (ske->aborted) {
+ /** Aborted */
+ silc_fsm_next(fsm, silc_ske_st_responder_aborted);
+ return SILC_FSM_CONTINUE;
+ }
+
+ /* Add rekey exchange timeout */
+ silc_schedule_task_add_timeout(ske->schedule, silc_ske_timeout,
+ ske, 30, 0);
+
+ silc_fsm_next(fsm, silc_ske_st_rekey_responder_start);
+
+ /* If REKEY packet already received process it directly */
+ if (ske->packet && ske->packet->type == SILC_PACKET_REKEY)
+ return SILC_FSM_CONTINUE;
+
+ /* Wait for REKEY */
+ return SILC_FSM_WAIT;
+}
+
+/* Process initiator's REKEY packet */
SILC_FSM_STATE(silc_ske_st_rekey_responder_start)
{
+ SilcSKE ske = fsm_context;
+ SilcSKEStatus status;
+
+ SILC_LOG_DEBUG(("Start"));
+
+ if (ske->packet->type != SILC_PACKET_REKEY) {
+ ske->status = SILC_SKE_STATUS_ERROR;
+ silc_packet_free(ske->packet);
+ ske->packet = NULL;
+ silc_fsm_next(fsm, silc_ske_st_responder_error);
+ return SILC_FSM_CONTINUE;
+ }
+
+ ske->prop = silc_calloc(1, sizeof(*ske->prop));
+ if (!ske->prop) {
+ /** No memory */
+ ske->status = SILC_SKE_STATUS_OUT_OF_MEMORY;
+ silc_fsm_next(fsm, silc_ske_st_responder_error);
+ return SILC_FSM_CONTINUE;
+ }
+
+ if (!silc_hash_alloc(ske->rekey->hash, &ske->prop->hash)) {
+ /** Cannot allocate hash */
+ ske->status = SILC_SKE_STATUS_OUT_OF_MEMORY;
+ silc_fsm_next(fsm, silc_ske_st_responder_error);
+ return SILC_FSM_CONTINUE;
+ }
+
+ /* If doing rekey without PFS, move directly to the end of the protocol. */
+ if (!ske->rekey->pfs) {
+ /** Rekey without PFS */
+ silc_fsm_next(fsm, silc_ske_st_rekey_responder_done);
+ return SILC_FSM_CONTINUE;
+ }
+
+ status = silc_ske_group_get_by_number(ske->rekey->ske_group,
+ &ske->prop->group);
+ if (status != SILC_SKE_STATUS_OK) {
+ /** Unknown group */
+ silc_fsm_next(fsm, silc_ske_st_responder_error);
+ return SILC_FSM_CONTINUE;
+ }
+
+ /** Rekey with PFS */
+ silc_fsm_next(fsm, silc_ske_st_responder_phase2);
+ return SILC_FSM_WAIT;
+}
+
+/* Sends REKEY_DONE packet to finish the protocol. */
+
+SILC_FSM_STATE(silc_ske_st_rekey_responder_done)
+{
+ SilcSKE ske = fsm_context;
+ SilcCipher send_key;
+ SilcHmac hmac_send;
+ SilcHash hash;
+ SilcUInt32 key_len, block_len, hash_len, x_len;
+ unsigned char *pfsbuf;
+
+ SILC_LOG_DEBUG(("Start"));
+
+ silc_packet_get_keys(ske->stream, &send_key, NULL, &hmac_send, NULL);
+ key_len = silc_cipher_get_key_len(send_key);
+ block_len = silc_cipher_get_block_len(send_key);
+ hash = ske->prop->hash;
+ hash_len = silc_hash_len(hash);
+
+ /* Process key material */
+ if (ske->rekey->pfs) {
+ /* PFS */
+ pfsbuf = silc_mp_mp2bin(ske->KEY, 0, &x_len);
+ if (pfsbuf) {
+ ske->keymat = silc_ske_process_key_material_data(pfsbuf, x_len,
+ block_len, key_len,
+ hash_len, hash);
+ memset(pfsbuf, 0, x_len);
+ silc_free(pfsbuf);
+ }
+ } else {
+ /* No PFS */
+ ske->keymat =
+ silc_ske_process_key_material_data(ske->rekey->send_enc_key,
+ ske->rekey->enc_key_len / 8,
+ block_len, key_len,
+ hash_len, hash);
+ }
+
+ if (!ske->keymat) {
+ SILC_LOG_ERROR(("Error processing key material"));
+ silc_fsm_next(fsm, silc_ske_st_responder_error);
+ return SILC_FSM_CONTINUE;
+ }
+
+ ske->prop->cipher = send_key;
+ ske->prop->hmac = hmac_send;
+
+ /* Get sending keys */
+ if (!silc_ske_set_keys(ske, ske->keymat, ske->prop, &send_key, NULL,
+ &hmac_send, NULL, NULL)) {
+ /** Cannot get keys */
+ ske->status = SILC_SKE_STATUS_ERROR;
+ ske->prop->cipher = NULL;
+ ske->prop->hmac = NULL;
+ silc_fsm_next(fsm, silc_ske_st_responder_error);
+ return SILC_FSM_CONTINUE;
+ }
+
+ ske->prop->cipher = NULL;
+ ske->prop->hmac = NULL;
+
+ /* Set the new keys into use. This will also send REKEY_DONE packet. Any
+ packet sent after this call will be protected with the new keys. */
+ if (!silc_packet_set_keys(ske->stream, send_key, NULL, hmac_send, NULL,
+ TRUE)) {
+ /** Cannot set keys */
+ SILC_LOG_DEBUG(("Cannot set new keys, error sending REKEY_DONE"));
+ ske->status = SILC_SKE_STATUS_ERROR;
+ silc_cipher_free(send_key);
+ silc_hmac_free(hmac_send);
+ silc_fsm_next(fsm, silc_ske_st_responder_error);
+ return SILC_FSM_CONTINUE;
+ }
+
+ /** Wait for REKEY_DONE */
+ silc_fsm_next(fsm, silc_ske_st_rekey_responder_end);
+ return SILC_FSM_WAIT;
+}
+
+/* Rekey protocol end */
+
+SILC_FSM_STATE(silc_ske_st_rekey_responder_end)
+{
+ SilcSKE ske = fsm_context;
+ SilcCipher receive_key;
+ SilcHmac hmac_receive;
+ SilcSKERekeyMaterial rekey;
+
+ SILC_LOG_DEBUG(("Start"));
+
+ if (ske->packet->type != SILC_PACKET_REKEY_DONE) {
+ SILC_LOG_DEBUG(("Remote retransmitted an old packet"));
+ silc_packet_free(ske->packet);
+ ske->packet = NULL;
+ return SILC_FSM_WAIT;
+ }
+
+ silc_packet_get_keys(ske->stream, NULL, &receive_key, NULL, &hmac_receive);
+ ske->prop->cipher = receive_key;
+ ske->prop->hmac = hmac_receive;
+
+ /* Get receiving keys */
+ if (!silc_ske_set_keys(ske, ske->keymat, ske->prop, NULL, &receive_key,
+ NULL, &hmac_receive, NULL)) {
+ /** Cannot get keys */
+ ske->status = SILC_SKE_STATUS_ERROR;
+ ske->prop->cipher = NULL;
+ ske->prop->hmac = NULL;
+ silc_fsm_next(fsm, silc_ske_st_responder_error);
+ return SILC_FSM_CONTINUE;
+ }
+
+ /* Set new receiving keys into use. All packets received after this will
+ be decrypted with the new keys. */
+ if (!silc_packet_set_keys(ske->stream, NULL, receive_key, NULL,
+ hmac_receive, FALSE)) {
+ /** Cannot set keys */
+ SILC_LOG_DEBUG(("Cannot set new keys"));
+ ske->status = SILC_SKE_STATUS_ERROR;
+ ske->prop->cipher = NULL;
+ ske->prop->hmac = NULL;
+ silc_cipher_free(receive_key);
+ silc_hmac_free(hmac_receive);
+ silc_fsm_next(fsm, silc_ske_st_responder_error);
+ return SILC_FSM_CONTINUE;
+ }
+
+ SILC_LOG_DEBUG(("Rekey completed successfully"));
+
+ /* Generate new rekey material */
+ rekey = silc_ske_make_rekey_material(ske, ske->keymat);
+ if (!rekey) {
+ /** No memory */
+ ske->status = SILC_SKE_STATUS_OUT_OF_MEMORY;
+ ske->prop->cipher = NULL;
+ ske->prop->hmac = NULL;
+ silc_fsm_next(fsm, silc_ske_st_responder_error);
+ return SILC_FSM_CONTINUE;
+ }
+ rekey->pfs = ske->rekey->pfs;
+ ske->rekey = rekey;
+
+ ske->prop->cipher = NULL;
+ ske->prop->hmac = NULL;
+ silc_packet_free(ske->packet);
+ ske->packet = NULL;
+ silc_packet_stream_unlink(ske->stream, &silc_ske_stream_cbs, ske);
+ silc_schedule_task_del_by_context(ske->schedule, ske);
+
+ /* Call completion */
+ silc_ske_completion(ske);
+
return SILC_FSM_FINISH;
}
SilcAsyncOperation
silc_ske_rekey_responder(SilcSKE ske,
SilcPacketStream stream,
- SilcBuffer ke_payload,
- SilcSKERekeyMaterial rekey)
+ SilcSKERekeyMaterial rekey,
+ SilcPacket packet)
{
SILC_LOG_DEBUG(("Start SKE rekey as responder"));
if (!ske || !stream || !rekey)
return NULL;
- if (rekey->pfs && !ke_payload)
- return NULL;
if (!silc_async_init(&ske->op, silc_ske_abort, NULL, ske))
return NULL;
- if (!silc_fsm_init(&ske->fsm, ske, NULL, NULL, ske->schedule))
+ if (!silc_fsm_init(&ske->fsm, ske, silc_ske_finished, ske, ske->schedule))
return NULL;
- // ske->packet_buf = ke_payload;
ske->rekey = rekey;
+ ske->responder = TRUE;
+ ske->running = TRUE;
+ ske->rekeying = TRUE;
+ ske->packet = packet;
/* Link to packet stream to get key exchange packets */
ske->stream = stream;
+ silc_packet_stream_link(ske->stream, &silc_ske_stream_cbs, ske, 1000000,
+ SILC_PACKET_REKEY,
+ SILC_PACKET_REKEY_DONE,
+ SILC_PACKET_KEY_EXCHANGE_1,
+ SILC_PACKET_SUCCESS,
+ SILC_PACKET_FAILURE, -1);
/* Start SKE rekey as responder */
- silc_fsm_start(&ske->fsm, silc_ske_st_rekey_responder_start);
+ silc_fsm_start_sync(&ske->fsm, silc_ske_st_rekey_responder_wait);
return &ske->op;
}
return NULL;
silc_buffer_format(buf,
SILC_STR_UI_CHAR(0),
- SILC_STR_UI_XNSTRING(data, data_len),
+ SILC_STR_DATA(data, data_len),
SILC_STR_END);
/* Take IVs */
if (!dist)
return NULL;
silc_buffer_format(dist,
- SILC_STR_UI_XNSTRING(data, data_len),
- SILC_STR_UI_XNSTRING(k1, hash_len),
+ SILC_STR_DATA(data, data_len),
+ SILC_STR_DATA(k1, hash_len),
SILC_STR_END);
memset(k2, 0, sizeof(k2));
silc_hash_make(hash, dist->data, silc_buffer_len(dist), k2);
silc_buffer_pull_tail(dist, hash_len);
silc_buffer_pull(dist, data_len + hash_len);
silc_buffer_format(dist,
- SILC_STR_UI_XNSTRING(k2, hash_len),
+ SILC_STR_DATA(k2, hash_len),
SILC_STR_END);
silc_buffer_push(dist, data_len + hash_len);
memset(k3, 0, sizeof(k3));
if (!dist)
return NULL;
silc_buffer_format(dist,
- SILC_STR_UI_XNSTRING(data, data_len),
- SILC_STR_UI_XNSTRING(k1, hash_len),
+ SILC_STR_DATA(data, data_len),
+ SILC_STR_DATA(k1, hash_len),
SILC_STR_END);
memset(k2, 0, sizeof(k2));
silc_hash_make(hash, dist->data, silc_buffer_len(dist), k2);
silc_buffer_pull_tail(dist, hash_len);
silc_buffer_pull(dist, data_len + hash_len);
silc_buffer_format(dist,
- SILC_STR_UI_XNSTRING(k2, hash_len),
+ SILC_STR_DATA(k2, hash_len),
SILC_STR_END);
silc_buffer_push(dist, data_len + hash_len);
memset(k3, 0, sizeof(k3));
silc_buffer_clear(buf);
silc_buffer_free(buf);
+ SILC_LOG_HEXDUMP(("enc"), key->send_enc_key, key->enc_key_len / 8);
+
return key;
}
silc_ske_process_key_material(SilcSKE ske,
SilcUInt32 req_iv_len,
SilcUInt32 req_enc_key_len,
- SilcUInt32 req_hmac_key_len)
+ SilcUInt32 req_hmac_key_len,
+ SilcSKERekeyMaterial *rekey)
{
SilcBuffer buf;
unsigned char *tmpbuf;
if (!buf)
return NULL;
silc_buffer_format(buf,
- SILC_STR_UI_XNSTRING(tmpbuf, klen),
- SILC_STR_UI_XNSTRING(ske->hash, ske->hash_len),
+ SILC_STR_DATA(tmpbuf, klen),
+ SILC_STR_DATA(ske->hash, ske->hash_len),
SILC_STR_END);
/* Process the key material */
silc_buffer_clear(buf);
silc_buffer_free(buf);
+ if (rekey) {
+ *rekey = silc_ske_make_rekey_material(ske, key);
+ if (!(*rekey))
+ return NULL;
+ }
+
return key;
}
silc_free(key);
}
+/* Free rekey material */
+
+void silc_ske_free_rekey_material(SilcSKERekeyMaterial rekey)
+{
+ if (!rekey)
+ return;
+ if (rekey->send_enc_key) {
+ memset(rekey->send_enc_key, 0, rekey->enc_key_len / 8);
+ silc_free(rekey->send_enc_key);
+ }
+ silc_free(rekey->hash);
+ silc_free(rekey);
+}
+
/* Set keys into use */
SilcBool silc_ske_set_keys(SilcSKE ske,
SilcHmac *ret_hmac_receive,
SilcHash *ret_hash)
{
+ unsigned char iv[SILC_HASH_MAXLEN];
+ SilcBool iv_included = (prop->flags & SILC_SKE_SP_FLAG_IV_INCLUDED);
+
/* Allocate ciphers to be used in the communication */
if (ret_send_key) {
if (!silc_cipher_alloc((char *)silc_cipher_get_name(prop->cipher),
return FALSE;
}
- /* Set key material */
- if (ske->responder) {
- silc_cipher_set_key(*ret_send_key, keymat->receive_enc_key,
- keymat->enc_key_len);
- silc_cipher_set_iv(*ret_send_key, keymat->receive_iv);
- silc_cipher_set_key(*ret_receive_key, keymat->send_enc_key,
- keymat->enc_key_len);
- silc_cipher_set_iv(*ret_receive_key, keymat->send_iv);
- silc_hmac_set_key(*ret_hmac_send, keymat->receive_hmac_key,
- keymat->hmac_key_len);
- silc_hmac_set_key(*ret_hmac_receive, keymat->send_hmac_key,
- keymat->hmac_key_len);
- } else {
- silc_cipher_set_key(*ret_send_key, keymat->send_enc_key,
- keymat->enc_key_len);
- silc_cipher_set_iv(*ret_send_key, keymat->send_iv);
- silc_cipher_set_key(*ret_receive_key, keymat->receive_enc_key,
- keymat->enc_key_len);
- silc_cipher_set_iv(*ret_receive_key, keymat->receive_iv);
- silc_hmac_set_key(*ret_hmac_send, keymat->send_hmac_key,
- keymat->hmac_key_len);
- silc_hmac_set_key(*ret_hmac_receive, keymat->receive_hmac_key,
- keymat->hmac_key_len);
- }
-
/* Allocate hash */
if (ret_hash) {
if (!silc_hash_alloc(silc_hash_get_name(prop->hash), ret_hash))
return FALSE;
}
+ /* Set key material */
+ memset(iv, 0, sizeof(iv));
+ if (ske->responder) {
+ if (ret_send_key) {
+ silc_cipher_set_key(*ret_send_key, keymat->receive_enc_key,
+ keymat->enc_key_len, TRUE);
+
+ if (silc_cipher_get_mode(*ret_send_key) == SILC_CIPHER_MODE_CTR) {
+ /* Counter mode */
+ if (!ske->rekeying) {
+ /* Set IV. */
+ memcpy(iv, ske->hash, 4);
+ if (!iv_included)
+ memcpy(iv + 4, keymat->receive_iv, 8);
+ } else {
+ /* Rekey, recompute the truncated hash value. */
+ silc_hash_make(prop->hash, keymat->receive_iv, 8, iv);
+ if (!iv_included)
+ memcpy(iv + 4, keymat->receive_iv, 8);
+ else
+ memset(iv + 4, 0, 12);
+ }
+
+ silc_cipher_set_iv(*ret_send_key, iv);
+ } else {
+ /* Other modes */
+ silc_cipher_set_iv(*ret_send_key, keymat->receive_iv);
+ }
+ }
+ if (ret_receive_key) {
+ silc_cipher_set_key(*ret_receive_key, keymat->send_enc_key,
+ keymat->enc_key_len, FALSE);
+
+ if (silc_cipher_get_mode(*ret_receive_key) == SILC_CIPHER_MODE_CTR) {
+ /* Counter mode */
+ if (!ske->rekeying) {
+ /* Set IV. */
+ memcpy(iv, ske->hash, 4);
+ if (!iv_included)
+ memcpy(iv + 4, keymat->send_iv, 8);
+ } else {
+ /* Rekey, recompute the truncated hash value. */
+ silc_hash_make(prop->hash, keymat->send_iv, 8, iv);
+ if (!iv_included)
+ memcpy(iv + 4, keymat->send_iv, 8);
+ else
+ memset(iv + 4, 0, 12);
+ }
+
+ silc_cipher_set_iv(*ret_receive_key, iv);
+ } else {
+ /* Other modes */
+ silc_cipher_set_iv(*ret_receive_key, keymat->send_iv);
+ }
+ }
+ if (ret_hmac_send)
+ silc_hmac_set_key(*ret_hmac_send, keymat->receive_hmac_key,
+ keymat->hmac_key_len);
+ if (ret_hmac_receive)
+ silc_hmac_set_key(*ret_hmac_receive, keymat->send_hmac_key,
+ keymat->hmac_key_len);
+ } else {
+ if (ret_send_key) {
+ silc_cipher_set_key(*ret_send_key, keymat->send_enc_key,
+ keymat->enc_key_len, TRUE);
+
+ if (silc_cipher_get_mode(*ret_send_key) == SILC_CIPHER_MODE_CTR) {
+ /* Counter mode */
+ if (!ske->rekeying) {
+ /* Set IV. */
+ memcpy(iv, ske->hash, 4);
+ if (!iv_included)
+ memcpy(iv + 4, keymat->send_iv, 8);
+ } else {
+ /* Rekey, recompute the truncated hash value. */
+ silc_hash_make(prop->hash, keymat->send_iv, 8, iv);
+ if (!iv_included)
+ memcpy(iv + 4, keymat->send_iv, 8);
+ else
+ memset(iv + 4, 0, 12);
+ }
+
+ silc_cipher_set_iv(*ret_send_key, iv);
+ } else {
+ /* Other modes */
+ silc_cipher_set_iv(*ret_send_key, keymat->send_iv);
+ }
+ }
+ if (ret_receive_key) {
+ silc_cipher_set_key(*ret_receive_key, keymat->receive_enc_key,
+ keymat->enc_key_len, FALSE);
+
+ if (silc_cipher_get_mode(*ret_receive_key) == SILC_CIPHER_MODE_CTR) {
+ /* Counter mode */
+ if (!ske->rekeying) {
+ /* Set IV. If IV Included flag was negotiated we only set the
+ truncated hash value. */
+ memcpy(iv, ske->hash, 4);
+ if (!iv_included)
+ memcpy(iv + 4, keymat->receive_iv, 8);
+ } else {
+ /* Rekey, recompute the truncated hash value. */
+ silc_hash_make(prop->hash, keymat->receive_iv, 8, iv);
+ if (!iv_included)
+ memcpy(iv + 4, keymat->receive_iv, 8);
+ else
+ memset(iv + 4, 0, 12);
+ }
+
+ silc_cipher_set_iv(*ret_receive_key, iv);
+ } else {
+ /* Other modes */
+ silc_cipher_set_iv(*ret_receive_key, keymat->receive_iv);
+ }
+ }
+ if (ret_hmac_send)
+ silc_hmac_set_key(*ret_hmac_send, keymat->send_hmac_key,
+ keymat->hmac_key_len);
+ if (ret_hmac_receive)
+ silc_hmac_set_key(*ret_hmac_receive, keymat->receive_hmac_key,
+ keymat->hmac_key_len);
+ }
+
return TRUE;
}
{
/* Official */
"Ok",
- "Unkown error occurred",
+ "Unexpected error occurred",
"Bad payload in packet",
"Unsupported group",
"Unsupported cipher",
"Bad payload length in packet",
"Error computing signature",
"System out of memory",
+ "Key exchange timeout",
NULL
};
projects / silc.git / blobdiff