/* * Copyright (C) 2007-2008 Tobias Brunner * Hochschule fuer Technik Rapperswil * * 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. See . * * 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. */ #include "ike_me.h" #include #include #include #include #include #include #include #include #define ME_CONNECTID_LEN 4 #define ME_CONNECTKEY_LEN 16 typedef struct private_ike_me_t private_ike_me_t; /** * Private members of a ike_me_t task. */ struct private_ike_me_t { /** * Public methods and task_t interface. */ ike_me_t public; /** * Assigned IKE_SA. */ ike_sa_t *ike_sa; /** * Are we the initiator? */ bool initiator; /** * Is this a mediation connection? */ bool mediation; /** * Is this the response from another peer? */ bool response; /** * Gathered endpoints */ linked_list_t *local_endpoints; /** * Parsed endpoints */ linked_list_t *remote_endpoints; /** * Did the peer request a callback? */ bool callback; /** * Did the connect fail? */ bool failed; /** * Was there anything wrong with the payloads? */ bool invalid_syntax; /** * The requested peer */ identification_t *peer_id; /** * Received ID used for connectivity checks */ chunk_t connect_id; /** * Received key used for connectivity checks */ chunk_t connect_key; /** * Peer config of the mediated connection */ peer_cfg_t *mediated_cfg; }; /** * Adds a list of endpoints as notifies to a given message */ static void add_endpoints_to_message(message_t *message, linked_list_t *endpoints) { iterator_t *iterator; endpoint_notify_t *endpoint; iterator = endpoints->create_iterator(endpoints, TRUE); while (iterator->iterate(iterator, (void**)&endpoint)) { message->add_payload(message, (payload_t*)endpoint->build_notify(endpoint)); } iterator->destroy(iterator); } /** * Gathers endpoints and adds them to the current message */ static void gather_and_add_endpoints(private_ike_me_t *this, message_t *message) { enumerator_t *enumerator; host_t *addr, *host; u_int16_t port; /* get the port that is used to communicate with the ms */ host = this->ike_sa->get_my_host(this->ike_sa); port = host->get_port(host); enumerator = hydra->kernel_interface->create_address_enumerator( hydra->kernel_interface, FALSE, FALSE); while (enumerator->enumerate(enumerator, (void**)&addr)) { host = addr->clone(addr); host->set_port(host, port); this->local_endpoints->insert_last(this->local_endpoints, endpoint_notify_create_from_host(HOST, host, NULL)); host->destroy(host); } enumerator->destroy(enumerator); host = this->ike_sa->get_server_reflexive_host(this->ike_sa); if (host) { this->local_endpoints->insert_last(this->local_endpoints, endpoint_notify_create_from_host(SERVER_REFLEXIVE, host, this->ike_sa->get_my_host(this->ike_sa))); } add_endpoints_to_message(message, this->local_endpoints); } /** * read notifys from message and evaluate them */ static void process_payloads(private_ike_me_t *this, message_t *message) { enumerator_t *enumerator; payload_t *payload; enumerator = message->create_payload_enumerator(message); while (enumerator->enumerate(enumerator, &payload)) { if (payload->get_type(payload) != NOTIFY) { continue; } notify_payload_t *notify = (notify_payload_t*)payload; switch (notify->get_notify_type(notify)) { case ME_CONNECT_FAILED: { DBG2(DBG_IKE, "received ME_CONNECT_FAILED notify"); this->failed = TRUE; break; } case ME_MEDIATION: { DBG2(DBG_IKE, "received ME_MEDIATION notify"); this->mediation = TRUE; break; } case ME_ENDPOINT: { endpoint_notify_t *endpoint; endpoint = endpoint_notify_create_from_payload(notify); if (!endpoint) { DBG1(DBG_IKE, "received invalid ME_ENDPOINT notify"); break; } DBG1(DBG_IKE, "received %N ME_ENDPOINT %#H", me_endpoint_type_names, endpoint->get_type(endpoint), endpoint->get_host(endpoint)); this->remote_endpoints->insert_last(this->remote_endpoints, endpoint); break; } case ME_CALLBACK: { DBG2(DBG_IKE, "received ME_CALLBACK notify"); this->callback = TRUE; break; } case ME_CONNECTID: { chunk_free(&this->connect_id); this->connect_id = chunk_clone(notify->get_notification_data(notify)); DBG2(DBG_IKE, "received ME_CONNECTID %#B", &this->connect_id); break; } case ME_CONNECTKEY: { chunk_free(&this->connect_key); this->connect_key = chunk_clone(notify->get_notification_data(notify)); DBG4(DBG_IKE, "received ME_CONNECTKEY %#B", &this->connect_key); break; } case ME_RESPONSE: { DBG2(DBG_IKE, "received ME_RESPONSE notify"); this->response = TRUE; break; } default: break; } } enumerator->destroy(enumerator); } /** * Implementation of task_t.build for initiator */ static status_t build_i(private_ike_me_t *this, message_t *message) { switch(message->get_exchange_type(message)) { case IKE_SA_INIT: { peer_cfg_t *peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa); if (peer_cfg->is_mediation(peer_cfg)) { DBG2(DBG_IKE, "adding ME_MEDIATION"); message->add_notify(message, FALSE, ME_MEDIATION, chunk_empty); } else { return SUCCESS; } break; } case IKE_AUTH: { if (this->ike_sa->has_condition(this->ike_sa, COND_NAT_HERE)) { endpoint_notify_t *endpoint; endpoint = endpoint_notify_create_from_host(SERVER_REFLEXIVE, NULL, NULL); message->add_payload(message, (payload_t*)endpoint->build_notify(endpoint)); endpoint->destroy(endpoint); } break; } case ME_CONNECT: { rng_t *rng; id_payload_t *id_payload; id_payload = id_payload_create_from_identification(ID_PEER, this->peer_id); message->add_payload(message, (payload_t*)id_payload); rng = lib->crypto->create_rng(lib->crypto, RNG_STRONG); if (!rng) { DBG1(DBG_IKE, "unable to generate connect ID for ME_CONNECT"); return FAILED; } if (!this->response) { /* only the initiator creates a connect ID. the responder * returns the connect ID that it received from the initiator */ rng->allocate_bytes(rng, ME_CONNECTID_LEN, &this->connect_id); } rng->allocate_bytes(rng, ME_CONNECTKEY_LEN, &this->connect_key); rng->destroy(rng); message->add_notify(message, FALSE, ME_CONNECTID, this->connect_id); message->add_notify(message, FALSE, ME_CONNECTKEY, this->connect_key); if (this->response) { message->add_notify(message, FALSE, ME_RESPONSE, chunk_empty); } else { /* FIXME: should we make this configurable? */ message->add_notify(message, FALSE, ME_CALLBACK, chunk_empty); } gather_and_add_endpoints(this, message); break; } default: break; } return NEED_MORE; } /** * Implementation of task_t.process for responder */ static status_t process_r(private_ike_me_t *this, message_t *message) { switch(message->get_exchange_type(message)) { case ME_CONNECT: { id_payload_t *id_payload; id_payload = (id_payload_t*)message->get_payload(message, ID_PEER); if (!id_payload) { DBG1(DBG_IKE, "received ME_CONNECT without ID_PEER payload" ", aborting"); break; } this->peer_id = id_payload->get_identification(id_payload); process_payloads(this, message); if (this->callback) { DBG1(DBG_IKE, "received ME_CALLBACK for '%Y'", this->peer_id); break; } if (!this->connect_id.ptr) { DBG1(DBG_IKE, "received ME_CONNECT without ME_CONNECTID notify" ", aborting"); this->invalid_syntax = TRUE; break; } if (!this->connect_key.ptr) { DBG1(DBG_IKE, "received ME_CONNECT without ME_CONNECTKEY " "notify, aborting"); this->invalid_syntax = TRUE; break; } if (!this->remote_endpoints->get_count(this->remote_endpoints)) { DBG1(DBG_IKE, "received ME_CONNECT without any ME_ENDPOINT " "payloads, aborting"); this->invalid_syntax = TRUE; break; } DBG1(DBG_IKE, "received ME_CONNECT"); break; } default: break; } return NEED_MORE; } /** * Implementation of task_t.build for responder */ static status_t build_r(private_ike_me_t *this, message_t *message) { switch(message->get_exchange_type(message)) { case ME_CONNECT: { if (this->invalid_syntax) { message->add_notify(message, TRUE, INVALID_SYNTAX, chunk_empty); break; } if (this->callback) { /* we got a callback from the mediation server, initiate the * queued mediated connecction */ charon->connect_manager->check_and_initiate( charon->connect_manager, this->ike_sa->get_id(this->ike_sa), this->ike_sa->get_my_id(this->ike_sa), this->peer_id); return SUCCESS; } if (this->response) { /* FIXME: handle result of set_responder_data * as initiator, upon receiving a response from another peer, * update the checklist and start sending checks */ charon->connect_manager->set_responder_data( charon->connect_manager, this->connect_id, this->connect_key, this->remote_endpoints); } else { /* FIXME: handle result of set_initiator_data * as responder, create a checklist with the initiator's data */ charon->connect_manager->set_initiator_data( charon->connect_manager, this->peer_id, this->ike_sa->get_my_id(this->ike_sa), this->connect_id, this->connect_key, this->remote_endpoints, FALSE); if (this->ike_sa->respond(this->ike_sa, this->peer_id, this->connect_id) != SUCCESS) { return FAILED; } } break; } default: break; } return SUCCESS; } /** * Implementation of task_t.process for initiator */ static status_t process_i(private_ike_me_t *this, message_t *message) { switch(message->get_exchange_type(message)) { case IKE_SA_INIT: { process_payloads(this, message); if (!this->mediation) { DBG1(DBG_IKE, "server did not return a ME_MEDIATION, aborting"); return FAILED; } /* if we are on a mediation connection we switch to port 4500 even * if no NAT is detected. */ this->ike_sa->float_ports(this->ike_sa); return NEED_MORE; } case IKE_AUTH: { process_payloads(this, message); /* FIXME: we should update the server reflexive endpoint somehow, * if mobike notices a change */ endpoint_notify_t *reflexive; if (this->remote_endpoints->get_first(this->remote_endpoints, (void**)&reflexive) == SUCCESS && reflexive->get_type(reflexive) == SERVER_REFLEXIVE) { /* FIXME: should we accept this endpoint even if we did not send * a request? */ host_t *endpoint = reflexive->get_host(reflexive); endpoint = endpoint->clone(endpoint); this->ike_sa->set_server_reflexive_host(this->ike_sa, endpoint); } break; } case ME_CONNECT: { process_payloads(this, message); if (this->failed) { DBG1(DBG_IKE, "peer '%Y' is not online", this->peer_id); /* FIXME: notify the mediated connection (job?) */ } else { if (this->response) { /* FIXME: handle result of set_responder_data. */ /* as responder, we update the checklist and start sending * checks */ charon->connect_manager->set_responder_data( charon->connect_manager, this->connect_id, this->connect_key, this->local_endpoints); } else { /* FIXME: handle result of set_initiator_data */ /* as initiator, we create a checklist and set the * initiator's data */ charon->connect_manager->set_initiator_data( charon->connect_manager, this->ike_sa->get_my_id(this->ike_sa), this->peer_id, this->connect_id, this->connect_key, this->local_endpoints, TRUE); /* FIXME: also start a timer for the whole transaction * (maybe within the connect_manager?) */ } } break; } default: break; } return SUCCESS; } /** * Implementation of task_t.build for initiator (mediation server) */ static status_t build_i_ms(private_ike_me_t *this, message_t *message) { switch(message->get_exchange_type(message)) { case ME_CONNECT: { id_payload_t *id_payload; id_payload = id_payload_create_from_identification(ID_PEER, this->peer_id); message->add_payload(message, (payload_t*)id_payload); if (this->callback) { message->add_notify(message, FALSE, ME_CALLBACK, chunk_empty); } else { if (this->response) { message->add_notify(message, FALSE, ME_RESPONSE, chunk_empty); } message->add_notify(message, FALSE, ME_CONNECTID, this->connect_id); message->add_notify(message, FALSE, ME_CONNECTKEY, this->connect_key); add_endpoints_to_message(message, this->remote_endpoints); } break; } default: break; } return NEED_MORE; } /** * Implementation of task_t.process for responder (mediation server) */ static status_t process_r_ms(private_ike_me_t *this, message_t *message) { switch(message->get_exchange_type(message)) { case IKE_SA_INIT: { /* FIXME: we should check for SA* and TS* payloads. if there are * any, send NO_ADDITIONAL_SAS back and delete this SA */ process_payloads(this, message); return this->mediation ? NEED_MORE : SUCCESS; } case IKE_AUTH: { /* FIXME: we should check whether the current peer_config is * configured as mediation connection */ process_payloads(this, message); break; } case CREATE_CHILD_SA: { /* FIXME: if this is not to rekey the IKE SA we have to return a * NO_ADDITIONAL_SAS and then delete the SA */ break; } case ME_CONNECT: { id_payload_t *id_payload; id_payload = (id_payload_t*)message->get_payload(message, ID_PEER); if (!id_payload) { DBG1(DBG_IKE, "received ME_CONNECT without ID_PEER payload" ", aborting"); this->invalid_syntax = TRUE; break; } this->peer_id = id_payload->get_identification(id_payload); process_payloads(this, message); if (!this->connect_id.ptr) { DBG1(DBG_IKE, "received ME_CONNECT without ME_CONNECTID notify" ", aborting"); this->invalid_syntax = TRUE; break; } if (!this->connect_key.ptr) { DBG1(DBG_IKE, "received ME_CONNECT without ME_CONNECTKEY notify" ", aborting"); this->invalid_syntax = TRUE; break; } if (!this->remote_endpoints->get_count(this->remote_endpoints)) { DBG1(DBG_IKE, "received ME_CONNECT without any ME_ENDPOINT " "payloads, aborting"); this->invalid_syntax = TRUE; break; } break; } default: break; } return NEED_MORE; } /** * Implementation of task_t.build for responder (mediation server) */ static status_t build_r_ms(private_ike_me_t *this, message_t *message) { switch(message->get_exchange_type(message)) { case IKE_SA_INIT: { message->add_notify(message, FALSE, ME_MEDIATION, chunk_empty); return NEED_MORE; } case IKE_AUTH: { endpoint_notify_t *endpoint; if (this->remote_endpoints->get_first(this->remote_endpoints, (void**)&endpoint) == SUCCESS && endpoint->get_type(endpoint) == SERVER_REFLEXIVE) { host_t *host = this->ike_sa->get_other_host(this->ike_sa); DBG2(DBG_IKE, "received request for a server reflexive " "endpoint sending: %#H", host); endpoint = endpoint_notify_create_from_host(SERVER_REFLEXIVE, host, NULL); message->add_payload(message, (payload_t*)endpoint->build_notify(endpoint)); endpoint->destroy(endpoint); } this->ike_sa->act_as_mediation_server(this->ike_sa); break; } case ME_CONNECT: { if (this->invalid_syntax) { message->add_notify(message, TRUE, INVALID_SYNTAX, chunk_empty); break; } ike_sa_id_t *peer_sa; if (this->callback) { peer_sa = charon->mediation_manager->check_and_register( charon->mediation_manager, this->peer_id, this->ike_sa->get_other_id(this->ike_sa)); } else { peer_sa = charon->mediation_manager->check( charon->mediation_manager, this->peer_id); } if (!peer_sa) { /* the peer is not online */ message->add_notify(message, TRUE, ME_CONNECT_FAILED, chunk_empty); break; } job_t *job = (job_t*)mediation_job_create(this->peer_id, this->ike_sa->get_other_id(this->ike_sa), this->connect_id, this->connect_key, this->remote_endpoints, this->response); lib->processor->queue_job(lib->processor, job); break; } default: break; } return SUCCESS; } /** * Implementation of task_t.process for initiator (mediation server) */ static status_t process_i_ms(private_ike_me_t *this, message_t *message) { /* FIXME: theoretically we should be prepared to receive a ME_CONNECT_FAILED * here if the responding peer is not able to proceed. in this case we shall * notify the initiating peer with a ME_CONNECT request containing only a * ME_CONNECT_FAILED */ return SUCCESS; } /** * Implementation of ike_me.connect */ static void me_connect(private_ike_me_t *this, identification_t *peer_id) { this->peer_id = peer_id->clone(peer_id); } /** * Implementation of ike_me.respond */ static void me_respond(private_ike_me_t *this, identification_t *peer_id, chunk_t connect_id) { this->peer_id = peer_id->clone(peer_id); this->connect_id = chunk_clone(connect_id); this->response = TRUE; } /** * Implementation of ike_me.callback */ static void me_callback(private_ike_me_t *this, identification_t *peer_id) { this->peer_id = peer_id->clone(peer_id); this->callback = TRUE; } /** * Implementation of ike_me.relay */ static void relay(private_ike_me_t *this, identification_t *requester, chunk_t connect_id, chunk_t connect_key, linked_list_t *endpoints, bool response) { this->peer_id = requester->clone(requester); this->connect_id = chunk_clone(connect_id); this->connect_key = chunk_clone(connect_key); this->remote_endpoints->destroy_offset(this->remote_endpoints, offsetof(endpoint_notify_t, destroy)); this->remote_endpoints = endpoints->clone_offset(endpoints, offsetof(endpoint_notify_t, clone)); this->response = response; } /** * Implementation of task_t.get_type */ static task_type_t get_type(private_ike_me_t *this) { return IKE_ME; } /** * Implementation of task_t.migrate */ static void migrate(private_ike_me_t *this, ike_sa_t *ike_sa) { this->ike_sa = ike_sa; } /** * Implementation of task_t.destroy */ static void destroy(private_ike_me_t *this) { DESTROY_IF(this->peer_id); chunk_free(&this->connect_id); chunk_free(&this->connect_key); this->local_endpoints->destroy_offset(this->local_endpoints, offsetof(endpoint_notify_t, destroy)); this->remote_endpoints->destroy_offset(this->remote_endpoints, offsetof(endpoint_notify_t, destroy)); DESTROY_IF(this->mediated_cfg); free(this); } /* * Described in header. */ ike_me_t *ike_me_create(ike_sa_t *ike_sa, bool initiator) { private_ike_me_t *this = malloc_thing(private_ike_me_t); this->public.task.get_type = (task_type_t(*)(task_t*))get_type; this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate; this->public.task.destroy = (void(*)(task_t*))destroy; if (ike_sa->has_condition(ike_sa, COND_ORIGINAL_INITIATOR)) { if (initiator) { this->public.task.build = (status_t(*)(task_t*,message_t*))build_i; this->public.task.process = (status_t(*)(task_t*,message_t*))process_i; } else { this->public.task.build = (status_t(*)(task_t*,message_t*))build_r; this->public.task.process = (status_t(*)(task_t*,message_t*))process_r; } } else { /* mediation server */ if (initiator) { this->public.task.build = (status_t(*)(task_t*,message_t*))build_i_ms; this->public.task.process = (status_t(*)(task_t*,message_t*))process_i_ms; } else { this->public.task.build = (status_t(*)(task_t*,message_t*))build_r_ms; this->public.task.process = (status_t(*)(task_t*,message_t*))process_r_ms; } } this->public.connect = (void(*)(ike_me_t*,identification_t*))me_connect; this->public.respond = (void(*)(ike_me_t*,identification_t*,chunk_t))me_respond; this->public.callback = (void(*)(ike_me_t*,identification_t*))me_callback; this->public.relay = (void(*)(ike_me_t*,identification_t*,chunk_t,chunk_t,linked_list_t*,bool))relay; this->ike_sa = ike_sa; this->initiator = initiator; this->peer_id = NULL; this->connect_id = chunk_empty; this->connect_key = chunk_empty; this->local_endpoints = linked_list_create(); this->remote_endpoints = linked_list_create(); this->mediation = FALSE; this->response = FALSE; this->callback = FALSE; this->failed = FALSE; this->invalid_syntax = FALSE; this->mediated_cfg = NULL; return &this->public; }