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-rw-r--r--src/charon/sa/tasks/ike_auth.c513
1 files changed, 513 insertions, 0 deletions
diff --git a/src/charon/sa/tasks/ike_auth.c b/src/charon/sa/tasks/ike_auth.c
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index 000000000..2e54b7797
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+++ b/src/charon/sa/tasks/ike_auth.c
@@ -0,0 +1,513 @@
+/**
+ * @file ike_auth.c
+ *
+ * @brief Implementation of the ike_auth task.
+ *
+ */
+
+/*
+ * Copyright (C) 2005-2007 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_auth.h"
+
+#include <string.h>
+
+#include <daemon.h>
+#include <crypto/diffie_hellman.h>
+#include <encoding/payloads/id_payload.h>
+#include <encoding/payloads/auth_payload.h>
+#include <encoding/payloads/nonce_payload.h>
+
+
+typedef struct private_ike_auth_t private_ike_auth_t;
+
+/**
+ * Private members of a ike_auth_t task.
+ */
+struct private_ike_auth_t {
+
+ /**
+ * Public methods and task_t interface.
+ */
+ ike_auth_t public;
+
+ /**
+ * Assigned IKE_SA.
+ */
+ ike_sa_t *ike_sa;
+
+ /**
+ * Are we the initiator?
+ */
+ bool initiator;
+
+ /**
+ * Nonce chosen by us in ike_init
+ */
+ chunk_t my_nonce;
+
+ /**
+ * Nonce chosen by peer in ike_init
+ */
+ chunk_t other_nonce;
+
+ /**
+ * IKE_SA_INIT message sent by us
+ */
+ packet_t *my_packet;
+
+ /**
+ * IKE_SA_INIT message sent by peer
+ */
+ packet_t *other_packet;
+
+ /**
+ * authenticator to authenticate us
+ */
+ authenticator_t *my_auth;
+
+ /**
+ * authenticator to authenticate peer
+ */
+ authenticator_t *other_auth;
+
+ /**
+ * has the peer been authenticated successfully?
+ */
+ bool peer_authenticated;
+};
+
+/**
+ * build the payloads for the message
+ */
+static status_t build_payloads(private_ike_auth_t *this, message_t *message)
+{
+ authenticator_t *auth;
+ auth_payload_t *auth_payload;
+ id_payload_t *id_payload;
+ chunk_t ike_sa_init;
+ identification_t *me, *other;
+ policy_t *policy;
+ auth_method_t method = AUTH_RSA;
+ status_t status;
+
+ /* add own ID payload */
+ me = this->ike_sa->get_my_id(this->ike_sa);
+ other = this->ike_sa->get_other_id(this->ike_sa);
+
+ id_payload = id_payload_create_from_identification(this->initiator, me);
+ message->add_payload(message, (payload_t*)id_payload);
+
+ /* as initiator, include other ID if it does not contain wildcards */
+ if (this->initiator && !other->contains_wildcards(other))
+ {
+ id_payload = id_payload_create_from_identification(FALSE, other);
+ message->add_payload(message, (payload_t*)id_payload);
+ }
+
+ /* create own authenticator and add auth payload */
+ policy = this->ike_sa->get_policy(this->ike_sa);
+ if (policy)
+ {
+ method = policy->get_auth_method(policy);
+ }
+ auth = authenticator_create(this->ike_sa, method);
+ if (auth == NULL)
+ {
+ SIG(IKE_UP_FAILED, "configured authentication method %N not supported",
+ auth_method_names, method);
+ return FAILED;
+ }
+
+ ike_sa_init = this->my_packet->get_data(this->my_packet);
+ status = auth->build(auth, ike_sa_init, this->other_nonce, &auth_payload);
+ auth->destroy(auth);
+ if (status != SUCCESS)
+ {
+ SIG(IKE_UP_FAILED, "generating authentication data failed");
+ return FAILED;
+ }
+ message->add_payload(message, (payload_t*)auth_payload);
+
+ return SUCCESS;
+}
+
+/**
+ * process payloads from message
+ */
+static void process_payloads(private_ike_auth_t *this, message_t *message)
+{
+ iterator_t *iterator;
+ payload_t *payload;
+ payload_type_t type;
+ identification_t *idi = NULL, *idr = NULL;
+ auth_payload_t *auth_payload = NULL;
+ authenticator_t *auth;
+ auth_method_t auth_method;
+ status_t status;
+
+ iterator = message->get_payload_iterator(message);
+ while (iterator->iterate(iterator, (void**)&payload))
+ {
+ type = payload->get_type(payload);
+ switch (type)
+ {
+ case ID_INITIATOR:
+ {
+ id_payload_t *id_payload = (id_payload_t*)payload;
+ idi = id_payload->get_identification(id_payload);
+ break;
+ }
+ case ID_RESPONDER:
+ {
+ id_payload_t *id_payload = (id_payload_t*)payload;
+ idr = id_payload->get_identification(id_payload);
+ break;
+ }
+ case AUTHENTICATION:
+ {
+ auth_payload = (auth_payload_t*)payload;
+ break;
+ }
+ default:
+ break;
+ }
+ }
+ iterator->destroy(iterator);
+
+ /* apply IDs */
+ if ((this->initiator && idr == NULL) || (!this->initiator && idi == NULL))
+ {
+ SIG(IKE_UP_FAILED, "ID payload missing in message");
+ DESTROY_IF(idr); DESTROY_IF(idi);
+ return;
+ }
+
+ if (this->initiator)
+ {
+ identification_t *other_id = this->ike_sa->get_other_id(this->ike_sa);
+ if (!idr->matches(idr, other_id, NULL))
+ {
+ SIG(IKE_UP_FAILED, "received inacceptable id %D, %D required", idr,
+ this->ike_sa->get_other_id(this->ike_sa));
+ DESTROY_IF(idi); DESTROY_IF(idr);
+ return;
+ }
+ this->ike_sa->set_other_id(this->ike_sa, idr);
+ }
+ else
+ {
+ identification_t *my_id = this->ike_sa->get_other_id(this->ike_sa);
+ if (idr)
+ {
+ if (!idr->matches(idr, my_id, NULL))
+ {
+ SIG(IKE_UP_FAILED, "received inacceptable id %D, %D required",
+ idr, this->ike_sa->get_other_id(this->ike_sa));
+ DESTROY_IF(idi); DESTROY_IF(idr);
+ return;
+ }
+ this->ike_sa->set_my_id(this->ike_sa, idr);
+ }
+ else
+ {
+ if (my_id->contains_wildcards(my_id))
+ {
+ SIG(IKE_UP_FAILED, "own ID (%D) not defined after exchange",
+ my_id);
+ DESTROY_IF(idi);
+ return;
+ }
+ }
+ this->ike_sa->set_other_id(this->ike_sa, idi);
+ }
+
+ /* verify auth payload */
+ if (auth_payload == NULL)
+ {
+ SIG(IKE_UP_FAILED, "AUTH payload missing in message");
+ return;
+ }
+
+ auth_method = auth_payload->get_auth_method(auth_payload);
+ auth = authenticator_create(this->ike_sa, auth_method);
+ if (auth == NULL)
+ {
+ SIG(IKE_UP_FAILED, "authentication method %N used by %D not "
+ "supported", auth_method_names, auth_method,
+ this->ike_sa->get_other_id(this->ike_sa));
+ return;
+ }
+ status = auth->verify(auth, this->other_packet->get_data(this->other_packet),
+ this->my_nonce, auth_payload);
+ auth->destroy(auth);
+ if (status != SUCCESS)
+ {
+ SIG(IKE_UP_FAILED, "authentication of %D using %N failed",
+ this->ike_sa->get_other_id(this->ike_sa),
+ auth_method_names, auth_method);
+ return;
+ }
+ this->peer_authenticated = TRUE;
+}
+
+/**
+ * collect the needed information in the IKE_SA_INIT exchange from our message
+ */
+static status_t collect_my_init_data(private_ike_auth_t *this, message_t *message)
+{
+ nonce_payload_t *nonce;
+
+ /* get the nonce that was generated in ike_init */
+ nonce = (nonce_payload_t*)message->get_payload(message, NONCE);
+ if (nonce == NULL)
+ {
+ return FAILED;
+ }
+ this->my_nonce = nonce->get_nonce(nonce);
+
+ /* pre-generate the message, so we can store it for us */
+ if (this->ike_sa->generate_message(this->ike_sa, message,
+ &this->my_packet) != SUCCESS)
+ {
+ return FAILED;
+ }
+ return NEED_MORE;
+}
+
+/**
+ * collect the needed information in the IKE_SA_INIT exchange from others message
+ */
+static status_t collect_other_init_data(private_ike_auth_t *this, message_t *message)
+{
+ /* we collect the needed information in the IKE_SA_INIT exchange */
+ nonce_payload_t *nonce;
+
+ /* get the nonce that was generated in ike_init */
+ nonce = (nonce_payload_t*)message->get_payload(message, NONCE);
+ if (nonce == NULL)
+ {
+ return FAILED;
+ }
+ this->other_nonce = nonce->get_nonce(nonce);
+
+ /* pre-generate the message, so we can store it for us */
+ this->other_packet = message->get_packet(message);
+ return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.build for initiator
+ */
+static status_t build_i(private_ike_auth_t *this, message_t *message)
+{
+ if (message->get_exchange_type(message) == IKE_SA_INIT)
+ {
+ return collect_my_init_data(this, message);
+ }
+
+ if (build_payloads(this, message) == SUCCESS)
+ {
+ return NEED_MORE;
+ }
+ return FAILED;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_r(private_ike_auth_t *this, message_t *message)
+{
+ if (message->get_exchange_type(message) == IKE_SA_INIT)
+ {
+ return collect_other_init_data(this, message);
+ }
+
+ process_payloads(this, message);
+
+ return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.build for responder
+ */
+static status_t build_r(private_ike_auth_t *this, message_t *message)
+{
+ if (message->get_exchange_type(message) == IKE_SA_INIT)
+ {
+ return collect_my_init_data(this, message);
+ }
+
+ if (!this->peer_authenticated)
+ {
+ message->add_notify(message, TRUE, AUTHENTICATION_FAILED, chunk_empty);
+ return FAILED;
+ }
+
+ if (build_payloads(this, message) == SUCCESS)
+ {
+ this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
+ SIG(IKE_UP_SUCCESS, "IKE_SA established between %D[%H]...[%H]%D",
+ this->ike_sa->get_my_id(this->ike_sa),
+ this->ike_sa->get_my_host(this->ike_sa),
+ this->ike_sa->get_other_host(this->ike_sa),
+ this->ike_sa->get_other_id(this->ike_sa));
+ return SUCCESS;
+ }
+ return FAILED;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_i(private_ike_auth_t *this, message_t *message)
+{
+ iterator_t *iterator;
+ payload_t *payload;
+
+ if (message->get_exchange_type(message) == IKE_SA_INIT)
+ {
+ return collect_other_init_data(this, message);
+ }
+
+ iterator = message->get_payload_iterator(message);
+ while (iterator->iterate(iterator, (void**)&payload))
+ {
+ if (payload->get_type(payload) == NOTIFY)
+ {
+ notify_payload_t *notify = (notify_payload_t*)payload;
+ notify_type_t type = notify->get_notify_type(notify);
+
+ switch (type)
+ {
+ case NO_PROPOSAL_CHOSEN:
+ case SINGLE_PAIR_REQUIRED:
+ case NO_ADDITIONAL_SAS:
+ case INTERNAL_ADDRESS_FAILURE:
+ case FAILED_CP_REQUIRED:
+ case TS_UNACCEPTABLE:
+ case INVALID_SELECTORS:
+ /* these are errors, but are not critical as only the
+ * CHILD_SA won't get build, but IKE_SA establishes anyway */
+ DBG1(DBG_IKE, "received %N notify, no CHILD_SA built",
+ notify_type_names, type);
+ iterator->destroy(iterator);
+ return SUCCESS;
+ default:
+ {
+ if (type < 16383)
+ {
+ DBG1(DBG_IKE, "received %N notify error",
+ notify_type_names, type);
+ iterator->destroy(iterator);
+ return FAILED;
+ }
+ }
+ }
+ }
+ }
+ iterator->destroy(iterator);
+
+ process_payloads(this, message);
+
+ if (this->peer_authenticated)
+ {
+ this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
+ SIG(IKE_UP_SUCCESS, "IKE_SA established between %D[%H]...[%H]%D",
+ this->ike_sa->get_my_id(this->ike_sa),
+ this->ike_sa->get_my_host(this->ike_sa),
+ this->ike_sa->get_other_host(this->ike_sa),
+ this->ike_sa->get_other_id(this->ike_sa));
+ return SUCCESS;
+ }
+ return FAILED;
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static task_type_t get_type(private_ike_auth_t *this)
+{
+ return IKE_AUTHENTICATE;
+}
+
+/**
+ * Implementation of task_t.migrate
+ */
+static void migrate(private_ike_auth_t *this, ike_sa_t *ike_sa)
+{
+ chunk_free(&this->my_nonce);
+ chunk_free(&this->other_nonce);
+ DESTROY_IF(this->my_packet);
+ DESTROY_IF(this->other_packet);
+ DESTROY_IF(this->my_auth);
+ DESTROY_IF(this->other_auth);
+ this->my_packet = NULL;
+ this->other_packet = NULL;
+ this->my_auth = NULL;
+ this->other_auth = NULL;
+ this->peer_authenticated = FALSE;
+ this->ike_sa = ike_sa;
+}
+
+/**
+ * Implementation of task_t.destroy
+ */
+static void destroy(private_ike_auth_t *this)
+{
+ chunk_free(&this->my_nonce);
+ chunk_free(&this->other_nonce);
+ DESTROY_IF(this->my_packet);
+ DESTROY_IF(this->other_packet);
+ DESTROY_IF(this->my_auth);
+ DESTROY_IF(this->other_auth);
+ free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_auth_t *ike_auth_create(ike_sa_t *ike_sa, bool initiator)
+{
+ private_ike_auth_t *this = malloc_thing(private_ike_auth_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;
+ this->my_nonce = chunk_empty;
+ this->other_nonce = chunk_empty;
+ this->my_packet = NULL;
+ this->other_packet = NULL;
+ this->my_auth = NULL;
+ this->other_auth = NULL;
+ this->peer_authenticated = FALSE;
+
+ return &this->public;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-09-13 00:39:26 +0000