diff options
Diffstat (limited to 'src/libcharon/sa/tasks/ike_rekey.c')
| -rw-r--r-- | src/libcharon/sa/tasks/ike_rekey.c | 409 |
1 files changed, 409 insertions, 0 deletions
diff --git a/src/libcharon/sa/tasks/ike_rekey.c b/src/libcharon/sa/tasks/ike_rekey.c new file mode 100644 index 000000000..a2275e796 --- /dev/null +++ b/src/libcharon/sa/tasks/ike_rekey.c @@ -0,0 +1,409 @@ +/* + * Copyright (C) 2005-2008 Martin Willi + * Copyright (C) 2005 Jan Hutter + * 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 <http://www.fsf.org/copyleft/gpl.txt>. + * + * 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_rekey.h" + +#include <daemon.h> +#include <encoding/payloads/notify_payload.h> +#include <sa/tasks/ike_init.h> +#include <sa/tasks/ike_delete.h> +#include <processing/jobs/delete_ike_sa_job.h> +#include <processing/jobs/rekey_ike_sa_job.h> + + +typedef struct private_ike_rekey_t private_ike_rekey_t; + +/** + * Private members of a ike_rekey_t task. + */ +struct private_ike_rekey_t { + + /** + * Public methods and task_t interface. + */ + ike_rekey_t public; + + /** + * Assigned IKE_SA. + */ + ike_sa_t *ike_sa; + + /** + * New IKE_SA which replaces the current one + */ + ike_sa_t *new_sa; + + /** + * Are we the initiator? + */ + bool initiator; + + /** + * the IKE_INIT task which is reused to simplify rekeying + */ + ike_init_t *ike_init; + + /** + * IKE_DELETE task to delete the old IKE_SA after rekeying was successful + */ + ike_delete_t *ike_delete; + + /** + * colliding task detected by the task manager + */ + task_t *collision; +}; + +/** + * Implementation of task_t.build for initiator, after rekeying + */ +static status_t build_i_delete(private_ike_rekey_t *this, message_t *message) +{ + /* update exchange type to INFORMATIONAL for the delete */ + message->set_exchange_type(message, INFORMATIONAL); + + return this->ike_delete->task.build(&this->ike_delete->task, message); +} + +/** + * Implementation of task_t.process for initiator, after rekeying + */ +static status_t process_i_delete(private_ike_rekey_t *this, message_t *message) +{ + return this->ike_delete->task.process(&this->ike_delete->task, message); +} + +/** + * Implementation of task_t.build for initiator + */ +static status_t build_i(private_ike_rekey_t *this, message_t *message) +{ + peer_cfg_t *peer_cfg; + host_t *other_host; + + /* create new SA only on first try */ + if (this->new_sa == NULL) + { + this->new_sa = charon->ike_sa_manager->checkout_new(charon->ike_sa_manager, + TRUE); + + peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa); + other_host = this->ike_sa->get_other_host(this->ike_sa); + this->new_sa->set_peer_cfg(this->new_sa, peer_cfg); + this->new_sa->set_other_host(this->new_sa, other_host->clone(other_host)); + this->ike_init = ike_init_create(this->new_sa, TRUE, this->ike_sa); + this->ike_sa->set_state(this->ike_sa, IKE_REKEYING); + } + this->ike_init->task.build(&this->ike_init->task, message); + + return NEED_MORE; +} + +/** + * Implementation of task_t.process for responder + */ +static status_t process_r(private_ike_rekey_t *this, message_t *message) +{ + peer_cfg_t *peer_cfg; + iterator_t *iterator; + child_sa_t *child_sa; + + if (this->ike_sa->get_state(this->ike_sa) == IKE_DELETING) + { + DBG1(DBG_IKE, "peer initiated rekeying, but we are deleting"); + return NEED_MORE; + } + + iterator = this->ike_sa->create_child_sa_iterator(this->ike_sa); + while (iterator->iterate(iterator, (void**)&child_sa)) + { + switch (child_sa->get_state(child_sa)) + { + case CHILD_CREATED: + case CHILD_REKEYING: + case CHILD_DELETING: + /* we do not allow rekeying while we have children in-progress */ + DBG1(DBG_IKE, "peer initiated rekeying, but a child is half-open"); + iterator->destroy(iterator); + return NEED_MORE; + default: + break; + } + } + iterator->destroy(iterator); + + this->new_sa = charon->ike_sa_manager->checkout_new(charon->ike_sa_manager, + FALSE); + + peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa); + this->new_sa->set_peer_cfg(this->new_sa, peer_cfg); + this->ike_init = ike_init_create(this->new_sa, FALSE, this->ike_sa); + this->ike_init->task.process(&this->ike_init->task, message); + + return NEED_MORE; +} + +/** + * Implementation of task_t.build for responder + */ +static status_t build_r(private_ike_rekey_t *this, message_t *message) +{ + if (this->new_sa == NULL) + { + /* IKE_SA/a CHILD_SA is in an inacceptable state, deny rekeying */ + message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty); + return SUCCESS; + } + + if (this->ike_init->task.build(&this->ike_init->task, message) == FAILED) + { + return SUCCESS; + } + + this->ike_sa->set_state(this->ike_sa, IKE_REKEYING); + this->new_sa->set_state(this->new_sa, IKE_ESTABLISHED); + DBG0(DBG_IKE, "IKE_SA %s[%d] established between %H[%Y]...%H[%Y]", + this->new_sa->get_name(this->new_sa), + this->new_sa->get_unique_id(this->new_sa), + this->ike_sa->get_my_host(this->ike_sa), + this->ike_sa->get_my_id(this->ike_sa), + this->ike_sa->get_other_host(this->ike_sa), + this->ike_sa->get_other_id(this->ike_sa)); + + return SUCCESS; +} + +/** + * Implementation of task_t.process for initiator + */ +static status_t process_i(private_ike_rekey_t *this, message_t *message) +{ + if (message->get_notify(message, NO_ADDITIONAL_SAS)) + { + DBG1(DBG_IKE, "peer seems to not support IKE rekeying, " + "starting reauthentication"); + this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED); + charon->processor->queue_job(charon->processor, + (job_t*)rekey_ike_sa_job_create( + this->ike_sa->get_id(this->ike_sa), TRUE)); + return SUCCESS; + } + + switch (this->ike_init->task.process(&this->ike_init->task, message)) + { + case FAILED: + /* rekeying failed, fallback to old SA */ + if (!(this->collision && ( + this->collision->get_type(this->collision) == IKE_DELETE || + this->collision->get_type(this->collision) == IKE_REAUTH))) + { + job_t *job; + u_int32_t retry = RETRY_INTERVAL - (random() % RETRY_JITTER); + job = (job_t*)rekey_ike_sa_job_create( + this->ike_sa->get_id(this->ike_sa), FALSE); + DBG1(DBG_IKE, "IKE_SA rekeying failed, " + "trying again in %d seconds", retry); + this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED); + charon->scheduler->schedule_job(charon->scheduler, job, retry); + } + return SUCCESS; + case NEED_MORE: + /* bad dh group, try again */ + this->ike_init->task.migrate(&this->ike_init->task, this->new_sa); + return NEED_MORE; + default: + break; + } + + this->new_sa->set_state(this->new_sa, IKE_ESTABLISHED); + DBG0(DBG_IKE, "IKE_SA %s[%d] established between %H[%Y]...%H[%Y]", + this->new_sa->get_name(this->new_sa), + this->new_sa->get_unique_id(this->new_sa), + this->ike_sa->get_my_host(this->ike_sa), + this->ike_sa->get_my_id(this->ike_sa), + this->ike_sa->get_other_host(this->ike_sa), + this->ike_sa->get_other_id(this->ike_sa)); + + /* check for collisions */ + if (this->collision && + this->collision->get_type(this->collision) == IKE_REKEY) + { + chunk_t this_nonce, other_nonce; + host_t *host; + private_ike_rekey_t *other = (private_ike_rekey_t*)this->collision; + + this_nonce = this->ike_init->get_lower_nonce(this->ike_init); + other_nonce = other->ike_init->get_lower_nonce(other->ike_init); + + /* if we have the lower nonce, delete rekeyed SA. If not, delete + * the redundant. */ + if (memcmp(this_nonce.ptr, other_nonce.ptr, + min(this_nonce.len, other_nonce.len)) < 0) + { + /* peer should delete this SA. Add a timeout just in case. */ + job_t *job = (job_t*)delete_ike_sa_job_create( + other->new_sa->get_id(other->new_sa), TRUE); + charon->scheduler->schedule_job(charon->scheduler, job, 10); + DBG1(DBG_IKE, "IKE_SA rekey collision won, deleting rekeyed IKE_SA"); + charon->ike_sa_manager->checkin(charon->ike_sa_manager, other->new_sa); + other->new_sa = NULL; + } + else + { + DBG1(DBG_IKE, "IKE_SA rekey collision lost, deleting redundant IKE_SA"); + /* apply host for a proper delete */ + host = this->ike_sa->get_my_host(this->ike_sa); + this->new_sa->set_my_host(this->new_sa, host->clone(host)); + host = this->ike_sa->get_other_host(this->ike_sa); + this->new_sa->set_other_host(this->new_sa, host->clone(host)); + this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED); + if (this->new_sa->delete(this->new_sa) == DESTROY_ME) + { + charon->ike_sa_manager->checkin_and_destroy( + charon->ike_sa_manager, this->new_sa); + } + else + { + charon->ike_sa_manager->checkin( + charon->ike_sa_manager, this->new_sa); + } + /* set threads active IKE_SA after checkin */ + charon->bus->set_sa(charon->bus, this->ike_sa); + /* inherit to other->new_sa in destroy() */ + this->new_sa = other->new_sa; + other->new_sa = NULL; + return SUCCESS; + } + /* set threads active IKE_SA after checkin */ + charon->bus->set_sa(charon->bus, this->ike_sa); + } + + /* rekeying successful, delete the IKE_SA using a subtask */ + this->ike_delete = ike_delete_create(this->ike_sa, TRUE); + this->public.task.build = (status_t(*)(task_t*,message_t*))build_i_delete; + this->public.task.process = (status_t(*)(task_t*,message_t*))process_i_delete; + + return NEED_MORE; +} + +/** + * Implementation of task_t.get_type + */ +static task_type_t get_type(private_ike_rekey_t *this) +{ + return IKE_REKEY; +} + +static void collide(private_ike_rekey_t* this, task_t *other) +{ + DESTROY_IF(this->collision); + this->collision = other; +} + +/** + * Implementation of task_t.migrate + */ +static void migrate(private_ike_rekey_t *this, ike_sa_t *ike_sa) +{ + if (this->ike_init) + { + this->ike_init->task.destroy(&this->ike_init->task); + } + if (this->ike_delete) + { + this->ike_delete->task.destroy(&this->ike_delete->task); + } + if (this->new_sa) + { + charon->ike_sa_manager->checkin_and_destroy(charon->ike_sa_manager, + this->new_sa); + /* set threads active IKE_SA after checkin */ + charon->bus->set_sa(charon->bus, this->ike_sa); + } + DESTROY_IF(this->collision); + + this->collision = NULL; + this->ike_sa = ike_sa; + this->new_sa = NULL; + this->ike_init = NULL; + this->ike_delete = NULL; +} + +/** + * Implementation of task_t.destroy + */ +static void destroy(private_ike_rekey_t *this) +{ + if (this->new_sa) + { + if (this->new_sa->get_state(this->new_sa) == IKE_ESTABLISHED && + this->new_sa->inherit(this->new_sa, this->ike_sa) != DESTROY_ME) + { + /* invoke hook if rekeying was successful */ + charon->bus->ike_rekey(charon->bus, this->ike_sa, this->new_sa); + charon->ike_sa_manager->checkin(charon->ike_sa_manager, this->new_sa); + } + else + { + charon->ike_sa_manager->checkin_and_destroy(charon->ike_sa_manager, + this->new_sa); + } + /* set threads active IKE_SA after checkin */ + charon->bus->set_sa(charon->bus, this->ike_sa); + } + if (this->ike_init) + { + this->ike_init->task.destroy(&this->ike_init->task); + } + if (this->ike_delete) + { + this->ike_delete->task.destroy(&this->ike_delete->task); + } + DESTROY_IF(this->collision); + free(this); +} + +/* + * Described in header. + */ +ike_rekey_t *ike_rekey_create(ike_sa_t *ike_sa, bool initiator) +{ + private_ike_rekey_t *this = malloc_thing(private_ike_rekey_t); + + this->public.collide = (void(*)(ike_rekey_t*,task_t*))collide; + 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 (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; + } + + this->ike_sa = ike_sa; + this->new_sa = NULL; + this->ike_init = NULL; + this->ike_delete = NULL; + this->initiator = initiator; + this->collision = NULL; + + return &this->public; +} |