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-rw-r--r--src/charon/sa/states/responder_init.c568
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diff --git a/src/charon/sa/states/responder_init.c b/src/charon/sa/states/responder_init.c
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+++ b/src/charon/sa/states/responder_init.c
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+/**
+ * @file responder_init.c
+ *
+ * @brief Implementation of responder_init_t.
+ *
+ */
+
+/*
+ * Copyright (C) 2005 Jan Hutter, 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 "responder_init.h"
+
+#include <daemon.h>
+#include <sa/states/state.h>
+#include <sa/states/ike_sa_init_responded.h>
+#include <encoding/payloads/sa_payload.h>
+#include <encoding/payloads/ke_payload.h>
+#include <encoding/payloads/nonce_payload.h>
+#include <encoding/payloads/notify_payload.h>
+#include <crypto/diffie_hellman.h>
+
+
+typedef struct private_responder_init_t private_responder_init_t;
+
+/**
+ * Private data of a responder_init_t object.
+ *
+ */
+struct private_responder_init_t {
+ /**
+ * Methods of the state_t interface.
+ */
+ responder_init_t public;
+
+ /**
+ * Assigned IKE_SA.
+ */
+ protected_ike_sa_t *ike_sa;
+
+ /**
+ * Diffie Hellman object used to compute shared secret.
+ */
+ diffie_hellman_t *diffie_hellman;
+
+ /**
+ * Diffie Hellman group number from selected IKE proposal.
+ */
+ u_int16_t dh_group_number;
+
+ /**
+ * Priority used to get matching dh_group number.
+ */
+ u_int16_t dh_group_priority;
+
+ /**
+ * Sent nonce value.
+ *
+ * This value is passed to the next state of type IKE_SA_INIT_RESPONDED.
+ */
+ chunk_t sent_nonce;
+
+ /**
+ * Received nonce value
+ *
+ * This value is passed to the next state of type IKE_SA_INIT_RESPONDED.
+ */
+ chunk_t received_nonce;
+
+ /**
+ * Selected proposal
+ */
+ proposal_t *proposal;
+
+ /**
+ * Logger used to log data .
+ *
+ * Is logger of ike_sa!
+ */
+ logger_t *logger;
+
+ /**
+ * Handles received SA payload and builds the SA payload for the response.
+ *
+ * @param this calling object
+ * @param sa_request The received SA payload
+ * @param response the SA payload is added to this response message_t object.
+ * @return
+ * - DELETE_ME
+ * - SUCCESS
+ */
+ status_t (*build_sa_payload) (private_responder_init_t *this,sa_payload_t *sa_request, message_t *response);
+
+ /**
+ * Handles received KE payload and builds the KE payload for the response.
+ *
+ * @param this calling object
+ * @param ke_request The received KE payload
+ * @param response the KE payload is added to this response message_t object.
+ * - DELETE_ME
+ * - SUCCESS
+ */
+ status_t (*build_ke_payload) (private_responder_init_t *this,ke_payload_t *ke_request, message_t *response);
+
+ /**
+ * Handles received NONCE payload and builds the NONCE payload for the response.
+ *
+ * @param this calling object
+ * @param nonce_request The received NONCE payload
+ * @param response the NONCE payload is added to this response message_t object.
+ * - DELETE_ME
+ * - SUCCESS
+ */
+ status_t (*build_nonce_payload) (private_responder_init_t *this,nonce_payload_t *nonce_request, message_t *response);
+
+ /**
+ * Sends a IKE_SA_INIT reply containing a notify payload.
+ *
+ * @param this calling object
+ * @param notify_payload notify_payload to process
+ */
+ status_t (*process_notify_payload) (private_responder_init_t *this, notify_payload_t *notify_payload);
+
+ /**
+ * Destroy function called internally of this class after change
+ * to state IKE_SA_INIT_RESPONDED succeeded.
+ *
+ * This destroy function does not destroy objects which were passed to the new state.
+ *
+ * @param this calling object
+ */
+ void (*destroy_after_state_change) (private_responder_init_t *this);
+
+};
+
+/**
+ * Implementation of state_t.process_message.
+ */
+static status_t process_message(private_responder_init_t *this, message_t *message)
+{
+ ike_sa_init_responded_t *next_state;
+ chunk_t ike_sa_init_response_data;
+ chunk_t ike_sa_init_request_data;
+ sa_payload_t *sa_request = NULL;
+ ke_payload_t *ke_request = NULL;
+ nonce_payload_t *nonce_request = NULL;
+ host_t *source, *destination;
+ connection_t *connection;
+ iterator_t *payloads;
+ message_t *response;
+ status_t status;
+
+ if (message->get_exchange_type(message) != IKE_SA_INIT)
+ {
+ this->logger->log(this->logger, ERROR | LEVEL1, "Message of type %s not supported in state responder_init",mapping_find(exchange_type_m,message->get_exchange_type(message)));
+ return DELETE_ME;
+ }
+ if (!message->get_request(message))
+ {
+ this->logger->log(this->logger, ERROR | LEVEL1, "IKE_SA_INIT responses not allowed state ike_sa_init_responded");
+ return DELETE_ME;
+ }
+
+ /* this is the first message to process, so get host infos */
+ source = message->get_source(message);
+ destination = message->get_destination(message);
+
+ connection = charon->connections->get_connection_by_hosts(charon->connections, destination, source);
+ if (connection == NULL)
+ {
+ /* no configuration matches given hosts */
+ this->logger->log(this->logger, AUDIT, "IKE_SA_INIT request does not match any available connection. Deleting IKE_SA");
+ /* TODO: inform requestor */
+ return DELETE_ME;
+ }
+ this->ike_sa->set_connection(this->ike_sa,connection);
+
+ /* parse incoming message */
+ status = message->parse_body(message, NULL, NULL);
+ if (status != SUCCESS)
+ {
+ if (status == NOT_SUPPORTED)
+ {
+ this->logger->log(this->logger, AUDIT, "IKE_SA_INIT request contains unsupported payload with critical flag set. "
+ "Deleting IKE_SA");
+ this->ike_sa->send_notify(this->ike_sa, IKE_SA_INIT, UNSUPPORTED_CRITICAL_PAYLOAD, CHUNK_INITIALIZER);
+ }
+ else
+ {
+ this->logger->log(this->logger, AUDIT, "Unable to parse IKE_SA_INIT request. Deleting IKE_SA");
+ }
+ return DELETE_ME;
+ }
+
+ payloads = message->get_payload_iterator(message);
+ while (payloads->has_next(payloads))
+ {
+ payload_t *payload;
+
+ payloads->current(payloads, (void**)&payload);
+
+ switch (payload->get_type(payload))
+ {
+ case SECURITY_ASSOCIATION:
+ {
+ sa_request = (sa_payload_t*)payload;
+ break;
+ }
+ case KEY_EXCHANGE:
+ {
+ ke_request = (ke_payload_t*)payload;
+ break;
+ }
+ case NONCE:
+ {
+ nonce_request = (nonce_payload_t*)payload;
+ break;
+ }
+ case NOTIFY:
+ {
+ notify_payload_t *notify_payload = (notify_payload_t *) payload;
+ status = this->process_notify_payload(this, notify_payload);
+ if (status != SUCCESS)
+ {
+ payloads->destroy(payloads);
+ return status;
+ }
+ }
+ default:
+ {
+ this->logger->log(this->logger, ERROR|LEVEL1, "Ignoring payload %s (%d)",
+ mapping_find(payload_type_m, payload->get_type(payload)), payload->get_type(payload));
+ break;
+ }
+ }
+ }
+ payloads->destroy(payloads);
+
+ /* check if we have all payloads */
+ if (!(sa_request && ke_request && nonce_request))
+ {
+ this->logger->log(this->logger, AUDIT, "IKE_SA_INIT request did not contain all required payloads. Deleting IKE_SA");
+ return DELETE_ME;
+ }
+
+ this->ike_sa->build_message(this->ike_sa, IKE_SA_INIT, FALSE, &response);
+
+ status = this->build_sa_payload(this, sa_request, response);
+ if (status != SUCCESS)
+ {
+ response->destroy(response);
+ return status;
+ }
+
+ status = this->build_ke_payload(this, ke_request, response);
+ if (status != SUCCESS)
+ {
+ response->destroy(response);
+ return status;
+ }
+
+ status = this->build_nonce_payload(this, nonce_request, response);
+ if (status != SUCCESS)
+ {
+ response->destroy(response);
+ return status;
+ }
+
+ /* derive all the keys used in the IKE_SA */
+ status = this->ike_sa->build_transforms(this->ike_sa, this->proposal, this->diffie_hellman, this->received_nonce, this->sent_nonce);
+ if (status != SUCCESS)
+ {
+ this->logger->log(this->logger, AUDIT, "Transform objects could not be created from selected proposal. Deleting IKE_SA");
+ return DELETE_ME;
+ }
+
+ /* message can now be sent (must not be destroyed) */
+ status = this->ike_sa->send_response(this->ike_sa, response);
+ if (status != SUCCESS)
+ {
+ this->logger->log(this->logger, AUDIT, "Unable to send IKE_SA_INIT response. Deleting IKE_SA");
+ response->destroy(response);
+ return DELETE_ME;
+ }
+
+ /* state can now be changed */
+ this->logger->log(this->logger, CONTROL|LEVEL2, "Create next state object of type IKE_SA_INIT_RESPONDED");
+
+ response = this->ike_sa->get_last_responded_message(this->ike_sa);
+ ike_sa_init_response_data = response->get_packet_data(response);
+ ike_sa_init_request_data = message->get_packet_data(message);
+
+ next_state = ike_sa_init_responded_create(this->ike_sa, this->received_nonce, this->sent_nonce,ike_sa_init_request_data,
+ ike_sa_init_response_data);
+
+ /* state can now be changed */
+ this->ike_sa->set_new_state(this->ike_sa, (state_t *) next_state);
+ this->destroy_after_state_change(this);
+
+ return SUCCESS;
+}
+
+/**
+ * Implementation of private_initiator_init_t.build_sa_payload.
+ */
+static status_t build_sa_payload(private_responder_init_t *this,sa_payload_t *sa_request, message_t *response)
+{
+ proposal_t *proposal;
+ linked_list_t *proposal_list;
+ connection_t *connection;
+ sa_payload_t* sa_payload;
+ algorithm_t *algo;
+
+ connection = this->ike_sa->get_connection(this->ike_sa);
+
+ this->logger->log(this->logger, CONTROL | LEVEL2, "Process received SA payload");
+
+ /* get the list of suggested proposals */
+ proposal_list = sa_request->get_proposals (sa_request);
+
+ /* select proposal */
+ this->proposal = connection->select_proposal(connection, proposal_list);
+ while(proposal_list->remove_last(proposal_list, (void**)&proposal) == SUCCESS)
+ {
+ proposal->destroy(proposal);
+ }
+ proposal_list->destroy(proposal_list);
+ if (this->proposal == NULL)
+ {
+ this->logger->log(this->logger, AUDIT, "IKE_SA_INIT request did not contain any acceptable proposals. Deleting IKE_SA");
+ this->ike_sa->send_notify(this->ike_sa, IKE_SA_INIT, NO_PROPOSAL_CHOSEN, CHUNK_INITIALIZER);
+ return DELETE_ME;
+ }
+ /* get selected DH group to force policy, this is very restrictive!? */
+ this->proposal->get_algorithm(this->proposal, PROTO_IKE, DIFFIE_HELLMAN_GROUP, &algo);
+ this->dh_group_number = algo->algorithm;
+
+ this->logger->log(this->logger, CONTROL | LEVEL2, "SA Payload processed");
+
+ this->logger->log(this->logger, CONTROL|LEVEL2, "Building SA payload");
+ sa_payload = sa_payload_create_from_proposal(this->proposal);
+ this->logger->log(this->logger, CONTROL|LEVEL2, "add SA payload to message");
+ response->add_payload(response,(payload_t *) sa_payload);
+
+ return SUCCESS;
+}
+
+/**
+ * Implementation of private_initiator_init_t.build_ke_payload.
+ */
+static status_t build_ke_payload(private_responder_init_t *this,ke_payload_t *ke_request, message_t *response)
+{
+ diffie_hellman_group_t group;
+ ke_payload_t *ke_payload;
+ diffie_hellman_t *dh;
+ chunk_t key_data;
+
+ this->logger->log(this->logger, CONTROL | LEVEL2, "Process received KE payload");
+ group = ke_request->get_dh_group_number(ke_request);
+
+ if (group == MODP_UNDEFINED)
+ {
+ this->logger->log(this->logger, AUDIT, "No diffie hellman group to select. Deleting IKE_SA");
+ return DELETE_ME;
+ }
+
+ if (this->dh_group_number != group)
+ {
+ u_int16_t accepted_group;
+ chunk_t accepted_group_chunk;
+ /* group not same as selected one
+ * Maybe key exchange payload is before SA payload */
+ this->logger->log(this->logger, AUDIT, "IKE_SA_INIT request did not contain a acceptable diffie hellman group. Deleting IKE_SA");
+
+ accepted_group = htons(this->dh_group_number);
+ accepted_group_chunk.ptr = (u_int8_t*) &(accepted_group);
+ accepted_group_chunk.len = 2;
+ this->ike_sa->send_notify(this->ike_sa,IKE_SA_INIT,INVALID_KE_PAYLOAD,accepted_group_chunk);
+ return DELETE_ME;
+ }
+
+ /* create diffie hellman object to handle DH exchange */
+ dh = diffie_hellman_create(group);
+ if (dh == NULL)
+ {
+ this->logger->log(this->logger, AUDIT, "Could not generate DH object with group %d. Deleting IKE_SA",
+ mapping_find(diffie_hellman_group_m,group) );
+ return DELETE_ME;
+ }
+ this->logger->log(this->logger, CONTROL | LEVEL2, "Set other DH public value");
+
+ dh->set_other_public_value(dh, ke_request->get_key_exchange_data(ke_request));
+
+ this->diffie_hellman = dh;
+
+ this->logger->log(this->logger, CONTROL | LEVEL2, "KE Payload processed.");
+
+ this->logger->log(this->logger, CONTROL|LEVEL2, "Building KE payload");
+ this->diffie_hellman->get_my_public_value(this->diffie_hellman,&key_data);
+
+ ke_payload = ke_payload_create();
+ ke_payload->set_key_exchange_data(ke_payload,key_data);
+ ke_payload->set_dh_group_number(ke_payload, this->dh_group_number);
+ chunk_free(&key_data);
+
+ this->logger->log(this->logger, CONTROL|LEVEL2, "Add KE payload to message");
+ response->add_payload(response,(payload_t *) ke_payload);
+
+ return SUCCESS;
+}
+
+/**
+ * Implementation of private_responder_init_t.build_nonce_payload.
+ */
+static status_t build_nonce_payload(private_responder_init_t *this,nonce_payload_t *nonce_request, message_t *response)
+{
+ nonce_payload_t *nonce_payload;
+ randomizer_t *randomizer;
+ status_t status;
+
+ this->logger->log(this->logger, CONTROL | LEVEL2, "Process received NONCE payload");
+ free(this->received_nonce.ptr);
+ this->received_nonce = CHUNK_INITIALIZER;
+
+ this->logger->log(this->logger, CONTROL | LEVEL2, "Get NONCE value and store it");
+ this->received_nonce = nonce_request->get_nonce(nonce_request);
+
+ this->logger->log(this->logger, CONTROL | LEVEL2, "Create new NONCE value.");
+
+ randomizer = this->ike_sa->get_randomizer(this->ike_sa);
+ status = randomizer->allocate_pseudo_random_bytes(randomizer, NONCE_SIZE, &(this->sent_nonce));
+ if (status != SUCCESS)
+ {
+ return status;
+ }
+
+ this->logger->log(this->logger, CONTROL|LEVEL2, "Building NONCE payload");
+ nonce_payload = nonce_payload_create();
+ nonce_payload->set_nonce(nonce_payload, this->sent_nonce);
+
+ this->logger->log(this->logger, CONTROL|LEVEL2, "Add NONCE payload to message");
+ response->add_payload(response,(payload_t *) nonce_payload);
+
+ return SUCCESS;
+}
+
+/**
+ * Implementation of private_responder_init_t.process_notify_payload.
+ */
+static status_t process_notify_payload(private_responder_init_t *this, notify_payload_t *notify_payload)
+{
+ notify_message_type_t notify_message_type = notify_payload->get_notify_message_type(notify_payload);
+
+ this->logger->log(this->logger, CONTROL|LEVEL1, "Process notify type %s",
+ mapping_find(notify_message_type_m, notify_message_type));
+
+ if (notify_payload->get_protocol_id(notify_payload) != PROTO_IKE)
+ {
+ this->logger->log(this->logger, ERROR | LEVEL1, "Notify reply not for IKE protocol.");
+ return FAILED;
+ }
+ switch (notify_message_type)
+ {
+ default:
+ {
+ this->logger->log(this->logger, CONTROL, "IKE_SA_INIT request contained a notify (%d), ignored.",
+ notify_message_type);
+ return SUCCESS;
+ }
+ }
+}
+
+/**
+ * Implementation of state_t.get_state.
+ */
+static ike_sa_state_t get_state(private_responder_init_t *this)
+{
+ return RESPONDER_INIT;
+}
+
+/**
+ * Implementation of state_t.destroy.
+ */
+static void destroy(private_responder_init_t *this)
+{
+ this->logger->log(this->logger, CONTROL | LEVEL1, "Going to destroy responder init state object");
+
+ this->logger->log(this->logger, CONTROL | LEVEL2, "Destroy sent nonce");
+ chunk_free(&(this->sent_nonce));
+ this->logger->log(this->logger, CONTROL | LEVEL2, "Destroy received nonce");
+ chunk_free(&(this->received_nonce));
+
+ if (this->diffie_hellman != NULL)
+ {
+ this->logger->log(this->logger, CONTROL | LEVEL2, "Destroy diffie_hellman_t hellman object");
+ this->diffie_hellman->destroy(this->diffie_hellman);
+ }
+ if (this->proposal)
+ {
+ this->proposal->destroy(this->proposal);
+ }
+ this->logger->log(this->logger, CONTROL | LEVEL2, "Destroy object");
+ free(this);
+}
+
+/**
+ * Implementation of private_responder_init_t.destroy_after_state_change
+ */
+static void destroy_after_state_change (private_responder_init_t *this)
+{
+ this->logger->log(this->logger, CONTROL | LEVEL1, "Going to destroy responder_init_t state object");
+
+ /* destroy diffie hellman object */
+ if (this->diffie_hellman != NULL)
+ {
+ this->logger->log(this->logger, CONTROL | LEVEL2, "Destroy diffie_hellman_t object");
+ this->diffie_hellman->destroy(this->diffie_hellman);
+ }
+ if (this->proposal)
+ {
+ this->proposal->destroy(this->proposal);
+ }
+
+ this->logger->log(this->logger, CONTROL | LEVEL2, "Destroy object");
+ free(this);
+}
+
+/*
+ * Described in header.
+ */
+responder_init_t *responder_init_create(protected_ike_sa_t *ike_sa)
+{
+ private_responder_init_t *this = malloc_thing(private_responder_init_t);
+
+ /* interface functions */
+ this->public.state_interface.process_message = (status_t (*) (state_t *,message_t *)) process_message;
+ this->public.state_interface.get_state = (ike_sa_state_t (*) (state_t *)) get_state;
+ this->public.state_interface.destroy = (void (*) (state_t *)) destroy;
+
+ /* private functions */
+ this->build_sa_payload = build_sa_payload;
+ this->build_ke_payload = build_ke_payload;
+ this->build_nonce_payload = build_nonce_payload;
+ this->destroy_after_state_change = destroy_after_state_change;
+ this->process_notify_payload = process_notify_payload;
+
+ /* private data */
+ this->ike_sa = ike_sa;
+ this->logger = logger_manager->get_logger(logger_manager, IKE_SA);
+ this->sent_nonce = CHUNK_INITIALIZER;
+ this->received_nonce = CHUNK_INITIALIZER;
+ this->dh_group_number = MODP_UNDEFINED;
+ this->diffie_hellman = NULL;
+ this->proposal = NULL;
+
+ return &(this->public);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-22 19:35:07 +0000