diff options
Diffstat (limited to 'src/libcharon/sa/tasks/ike_cert_post.c')
-rw-r--r-- | src/libcharon/sa/tasks/ike_cert_post.c | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/src/libcharon/sa/tasks/ike_cert_post.c b/src/libcharon/sa/tasks/ike_cert_post.c new file mode 100644 index 000000000..c831df975 --- /dev/null +++ b/src/libcharon/sa/tasks/ike_cert_post.c @@ -0,0 +1,261 @@ +/* + * Copyright (C) 2008 Tobias Brunner + * Copyright (C) 2006-2009 Martin Willi + * 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_cert_post.h" + +#include <daemon.h> +#include <sa/ike_sa.h> +#include <encoding/payloads/cert_payload.h> +#include <encoding/payloads/certreq_payload.h> +#include <encoding/payloads/auth_payload.h> +#include <credentials/certificates/x509.h> + + +typedef struct private_ike_cert_post_t private_ike_cert_post_t; + +/** + * Private members of a ike_cert_post_t task. + */ +struct private_ike_cert_post_t { + + /** + * Public methods and task_t interface. + */ + ike_cert_post_t public; + + /** + * Assigned IKE_SA. + */ + ike_sa_t *ike_sa; + + /** + * Are we the initiator? + */ + bool initiator; +}; + +/** + * Generates the cert payload, if possible with "Hash and URL" + */ +static cert_payload_t *build_cert_payload(private_ike_cert_post_t *this, + certificate_t *cert) +{ + hasher_t *hasher; + identification_t *id; + chunk_t hash, encoded ; + enumerator_t *enumerator; + char *url; + cert_payload_t *payload = NULL; + + if (!this->ike_sa->supports_extension(this->ike_sa, EXT_HASH_AND_URL)) + { + return cert_payload_create_from_cert(cert); + } + + hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1); + if (!hasher) + { + DBG1(DBG_IKE, "unable to use hash-and-url: sha1 not supported"); + return cert_payload_create_from_cert(cert); + } + + encoded = cert->get_encoding(cert); + hasher->allocate_hash(hasher, encoded, &hash); + chunk_free(&encoded); + hasher->destroy(hasher); + id = identification_create_from_encoding(ID_KEY_ID, hash); + + enumerator = charon->credentials->create_cdp_enumerator(charon->credentials, + CERT_X509, id); + if (enumerator->enumerate(enumerator, &url)) + { + payload = cert_payload_create_from_hash_and_url(hash, url); + } + else + { + payload = cert_payload_create_from_cert(cert); + } + enumerator->destroy(enumerator); + chunk_free(&hash); + id->destroy(id); + return payload; +} + +/** + * add certificates to message + */ +static void build_certs(private_ike_cert_post_t *this, message_t *message) +{ + peer_cfg_t *peer_cfg; + auth_payload_t *payload; + + payload = (auth_payload_t*)message->get_payload(message, AUTHENTICATION); + peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa); + if (!peer_cfg || !payload || payload->get_auth_method(payload) == AUTH_PSK) + { /* no CERT payload for EAP/PSK */ + return; + } + + switch (peer_cfg->get_cert_policy(peer_cfg)) + { + case CERT_NEVER_SEND: + break; + case CERT_SEND_IF_ASKED: + if (!this->ike_sa->has_condition(this->ike_sa, COND_CERTREQ_SEEN)) + { + break; + } + /* FALL */ + case CERT_ALWAYS_SEND: + { + cert_payload_t *payload; + enumerator_t *enumerator; + certificate_t *cert; + auth_rule_t type; + auth_cfg_t *auth; + + auth = this->ike_sa->get_auth_cfg(this->ike_sa, TRUE); + + /* get subject cert first, then issuing certificates */ + cert = auth->get(auth, AUTH_RULE_SUBJECT_CERT); + if (!cert) + { + break; + } + payload = build_cert_payload(this, cert); + if (!payload) + { + break; + } + DBG1(DBG_IKE, "sending end entity cert \"%Y\"", + cert->get_subject(cert)); + message->add_payload(message, (payload_t*)payload); + + enumerator = auth->create_enumerator(auth); + while (enumerator->enumerate(enumerator, &type, &cert)) + { + if (type == AUTH_RULE_IM_CERT) + { + payload = cert_payload_create_from_cert(cert); + if (payload) + { + DBG1(DBG_IKE, "sending issuer cert \"%Y\"", + cert->get_subject(cert)); + message->add_payload(message, (payload_t*)payload); + } + } + } + enumerator->destroy(enumerator); + } + } +} + +/** + * Implementation of task_t.process for initiator + */ +static status_t build_i(private_ike_cert_post_t *this, message_t *message) +{ + build_certs(this, message); + + return NEED_MORE; +} + +/** + * Implementation of task_t.process for responder + */ +static status_t process_r(private_ike_cert_post_t *this, message_t *message) +{ + return NEED_MORE; +} + +/** + * Implementation of task_t.build for responder + */ +static status_t build_r(private_ike_cert_post_t *this, message_t *message) +{ + build_certs(this, message); + + if (this->ike_sa->get_state(this->ike_sa) != IKE_ESTABLISHED) + { /* stay alive, we might have additional rounds with certs */ + return NEED_MORE; + } + return SUCCESS; +} + +/** + * Implementation of task_t.process for initiator + */ +static status_t process_i(private_ike_cert_post_t *this, message_t *message) +{ + if (this->ike_sa->get_state(this->ike_sa) != IKE_ESTABLISHED) + { /* stay alive, we might have additional rounds with CERTS */ + return NEED_MORE; + } + return SUCCESS; +} + +/** + * Implementation of task_t.get_type + */ +static task_type_t get_type(private_ike_cert_post_t *this) +{ + return IKE_CERT_POST; +} + +/** + * Implementation of task_t.migrate + */ +static void migrate(private_ike_cert_post_t *this, ike_sa_t *ike_sa) +{ + this->ike_sa = ike_sa; +} + +/** + * Implementation of task_t.destroy + */ +static void destroy(private_ike_cert_post_t *this) +{ + free(this); +} + +/* + * Described in header. + */ +ike_cert_post_t *ike_cert_post_create(ike_sa_t *ike_sa, bool initiator) +{ + private_ike_cert_post_t *this = malloc_thing(private_ike_cert_post_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 (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->initiator = initiator; + + return &this->public; +} + |