Source/charon/ike_sa.c

   1 /**
   2  * @file ike_sa.c
   3  *
   4  * @brief Class ike_sa_t. An object of this type is managed by an
   5  * ike_sa_manager_t object and represents an IKE_SA
   6  *
   7  */
   8
   9 /*
  10  * Copyright (C) 2005 Jan Hutter, Martin Willi
  11  * Hochschule fuer Technik Rapperswil
  12  *
  13  * This program is free software; you can redistribute it and/or modify it
  14  * under the terms of the GNU General Public License as published by the
  15  * Free Software Foundation; either version 2 of the License, or (at your
  16  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  17  *
  18  * This program is distributed in the hope that it will be useful, but
  19  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  20  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  21  * for more details.
  22  */
  23
  24 #include "ike_sa.h"
  25
  26 #include "types.h"
  27 #include "globals.h"
  28 #include "definitions.h"
  29 #include "utils/allocator.h"
  30 #include "utils/linked_list.h"
  31 #include "utils/logger_manager.h"
  32 #include "utils/randomizer.h"
  33 #include "transforms/diffie_hellman.h"
  34 #include "payloads/sa_payload.h"
  35 #include "payloads/nonce_payload.h"
  36 #include "payloads/ke_payload.h"
  37 #include "payloads/transform_substructure.h"
  38 #include "payloads/transform_attribute.h"
  39 #include "states/initiator_init.h"
  40 #include "states/responder_init.h"
  41
  42
  43
  44
  45 /**
  46  * @brief implements function process_message of protected_ike_sa_t
  47  */
  48 static status_t process_message (protected_ike_sa_t *this, message_t *message)
  49 {
  50         u_int32_t message_id;
  51         exchange_type_t exchange_type;
  52         bool is_request;
  53         status_t status;
  54         state_t *new_state;
  55
  56         /* we must process each request or response from remote host */
  57
  58         /* find out type of message (request or response) */
  59         is_request = message->get_request(message);
  60         exchange_type = message->get_exchange_type(message);
  61
  62         this->logger->log(this->logger, CONTROL|MORE, "Process %s message of exchange type %s",(is_request) ? "REQUEST" : "RESPONSE",mapping_find(exchange_type_m,exchange_type));
  63
  64         message_id = message->get_message_id(message);
  65
  66         /*
  67          * It has to be checked, if the message has to be resent cause of lost packets!
  68          */
  69         if (is_request && ( message_id == (this->message_id_in - 1)))
  70         {
  71                 /* message can be resent ! */
  72                 this->logger->log(this->logger, CONTROL|MORE, "Resent message detected. Send stored reply");
  73                 return (this->resend_last_reply(this));
  74         }
  75
  76         /* Now, the message id is checked for request AND reply */
  77         if (is_request)
  78         {
  79                 /* In a request, the message has to be this->message_id_in (other case is already handled) */
  80                 if (message_id != this->message_id_in)
  81                 {
  82                         this->logger->log(this->logger, ERROR | MORE, "Message request with message id %d received, but %d expected",message_id,this->message_id_in);
  83                         return FAILED;
  84                 }
  85         }
  86         else
  87         {
  88                 /* In a reply, the message has to be this->message_id_out -1 cause it is the reply to the last sent message*/
  89                 if (message_id != (this->message_id_out - 1))
  90                 {
  91                         this->logger->log(this->logger, ERROR | MORE, "Message reply with message id %d received, but %d expected",message_id,this->message_id_in);
  92                         return FAILED;
  93                 }
  94         }
  95
  96         /* now the message is processed by the current state object */
  97         status = this->current_state->process_message(this->current_state,message,&new_state);
  98         if (status == SUCCESS)
  99         {
 100                 this->current_state = new_state;
 101         }
 102         return status;
 103 }
 104
 105 /**
 106  * @brief Implements function build_message of protected_ike_sa_t.
 107  */
 108 static status_t build_message(protected_ike_sa_t *this, exchange_type_t type, bool request, message_t **message)
 109 {
 110         status_t status;
 111         message_t *new_message;
 112         host_t *source, *destination;
 113
 114         this    ->logger->log(this->logger, CONTROL|MORE, "build empty message");
 115         new_message = message_create();
 116         if (new_message == NULL)
 117         {
 118                 this->logger->log(this->logger, ERROR, "Fatal error: could not create empty message object");
 119                 return OUT_OF_RES;
 120         }
 121
 122         status  = this->me.host->clone(this->me.host, &source);
 123         if (status != SUCCESS)
 124         {
 125                 this->logger->log(this->logger, ERROR, "Fatal error: could not clone my host information");
 126                 new_message->destroy(new_message);
 127                 return status;
 128         }
 129         status = this->other.host->clone(this->other.host, &destination);
 130         if (status != SUCCESS)
 131         {
 132                 this->logger->log(this->logger, ERROR, "Fatal error: could not clone other host information");
 133                 source->destroy(source);
 134                 new_message->destroy(new_message);
 135                 return status;
 136         }
 137
 138         new_message->set_source(new_message, source);
 139         new_message->set_destination(new_message, destination);
 140
 141         new_message->set_exchange_type(new_message, type);
 142         new_message->set_request(new_message, request);
 143
 144         new_message->set_message_id(new_message, (request) ? this->message_id_out : this->message_id_in);
 145
 146         status = new_message->set_ike_sa_id(new_message, this->ike_sa_id);
 147         if (status != SUCCESS)
 148         {
 149                 this->logger->log(this->logger, ERROR, "Fatal error: could not set ike_sa_id of message");
 150                 new_message->destroy(new_message);
 151                 return status;
 152         }
 153
 154         *message = new_message;
 155
 156         return SUCCESS;
 157 }
 158
 159 /**
 160  * @brief implements function process_configuration of protected_ike_sa_t
 161  */
 162 static status_t initialize_connection(protected_ike_sa_t *this, char *name)
 163 {
 164         /* work is done in state object of type INITIATOR_INIT */
 165         initiator_init_t *current_state;
 166         status_t status;
 167         state_t *new_state;
 168
 169         if (this->current_state->get_state(this->current_state) != INITIATOR_INIT)
 170         {
 171                 return FAILED;
 172         }
 173
 174         current_state = (initiator_init_t *) this->current_state;
 175
 176         status = current_state->initiate_connection(current_state,name,&new_state);
 177
 178         if (status == SUCCESS)
 179         {
 180                 this->current_state = new_state;
 181         }
 182         else
 183         {
 184                 this->create_delete_job(this);
 185         }
 186         return status;
 187 }
 188
 189 /**
 190  * @brief implements function protected_ike_sa_t.get_id
 191  */
 192 static ike_sa_id_t* get_id(protected_ike_sa_t *this)
 193 {
 194         return this->ike_sa_id;
 195 }
 196
 197 /**
 198  * @brief implements function resend_last_reply of protected_ike_sa_t
 199  */
 200 status_t resend_last_reply (protected_ike_sa_t *this)
 201 {
 202         packet_t *packet;
 203         status_t status;
 204
 205         status = this->last_responded_message->generate(this->last_responded_message, &packet);
 206         if (status != SUCCESS)
 207         {
 208                 this->logger->log(this->logger, ERROR, "Could not generate message to resent");
 209                 return status;
 210         }
 211
 212         status = global_send_queue->add(global_send_queue, packet);
 213         if (status != SUCCESS)
 214         {
 215                 this->logger->log(this->logger, ERROR, "Could not add packet to send queue");
 216                 packet->destroy(packet);
 217                 return status;
 218         }
 219         return SUCCESS;
 220 }
 221
 222 status_t create_delete_job (protected_ike_sa_t *this)
 223 {
 224         job_t *delete_job;
 225         status_t status;
 226
 227         this->logger->log(this->logger, CONTROL | MORE, "Going to create job to delete this IKE_SA");
 228
 229         delete_job = (job_t *) delete_ike_sa_job_create(this->ike_sa_id);
 230         if (delete_job == NULL)
 231         {
 232                 this->logger->log(this->logger, ERROR, "Job to delete IKE SA could not be created");
 233                 return FAILED;
 234         }
 235
 236         status = global_job_queue->add(global_job_queue,delete_job);
 237         if (status != SUCCESS)
 238         {
 239                 this->logger->log(this->logger, ERROR, "%s Job to delete IKE SA could not be added to job queue",mapping_find(status_m,status));
 240                 delete_job->destroy_all(delete_job);
 241                 return status;
 242         }
 243         return SUCCESS;
 244 }
 245
 246 /**
 247  * @brief implements function destroy of protected_ike_sa_t
 248  */
 249 static status_t destroy (protected_ike_sa_t *this)
 250 {
 251
 252         this->logger->log(this->logger, CONTROL | MORE, "Going to destroy IKE_SA");
 253
 254         /* destroy child sa's */
 255         this->logger->log(this->logger, CONTROL | MOST, "Destroy all child_sa's");
 256         while (this->child_sas->get_count(this->child_sas) > 0)
 257         {
 258                 void *child_sa;
 259                 if (this->child_sas->remove_first(this->child_sas,&child_sa) != SUCCESS)
 260                 {
 261                         break;
 262                 }
 263                 /* destroy child sa */
 264         }
 265         this->child_sas->destroy(this->child_sas);
 266
 267         /* destroy ike_sa_id */
 268         this->logger->log(this->logger, CONTROL | MOST, "Destroy assigned ike_sa_id");
 269         this->ike_sa_id->destroy(this->ike_sa_id);
 270
 271         /* destroy stored requested message */
 272         if (this->last_requested_message != NULL)
 273         {
 274                 this->logger->log(this->logger, CONTROL | MOST, "Destroy last requested message");
 275                 this->last_requested_message->destroy(this->last_requested_message);
 276         }
 277
 278         /* destroy stored responded messages */
 279         if (this->last_responded_message != NULL)
 280         {
 281                 this->logger->log(this->logger, CONTROL | MOST, "Destroy last responded message");
 282                 this->last_responded_message->destroy(this->last_responded_message);
 283         }
 284
 285         this->logger->log(this->logger, CONTROL | MOST, "Destroy randomizer");
 286         this->randomizer->destroy(this->randomizer);
 287
 288 //      if (this->me.host != NULL)
 289 //      {
 290 //              this->logger->log(this->logger, CONTROL | MOST, "Destroy host informations of me");
 291 //              this->me.host->destroy(this->me.host);
 292 //      }
 293 //
 294 //      if (this->other.host != NULL)
 295 //      {
 296 //              this->logger->log(this->logger, CONTROL | MOST, "Destroy host informations of other");
 297 //              this->other.host->destroy(this->other.host);
 298 //      }
 299 //
 300 //      this->logger->log(this->logger, CONTROL | MOST, "Destroy current state object");
 301 //      this->current_state->destroy(this->current_state);
 302 //
 303 //      this->logger->log(this->logger, CONTROL | MOST, "Destroy logger of IKE_SA");
 304 //      global_logger_manager->destroy_logger(global_logger_manager, this->logger);
 305 //
 306 //      allocator_free(this);
 307         return SUCCESS;
 308 }
 309
 310 /*
 311  * Described in Header
 312  */
 313 ike_sa_t * ike_sa_create(ike_sa_id_t *ike_sa_id)
 314 {
 315         protected_ike_sa_t *this = allocator_alloc_thing(protected_ike_sa_t);
 316         if (this == NULL)
 317         {
 318                 return NULL;
 319         }
 320
 321         /* Public functions */
 322         this->public.process_message = (status_t(*)(ike_sa_t*, message_t*)) process_message;
 323         this->public.initialize_connection = (status_t(*)(ike_sa_t*, char*)) initialize_connection;
 324         this->public.get_id = (ike_sa_id_t*(*)(ike_sa_t*)) get_id;
 325         this->public.destroy = (status_t(*)(ike_sa_t*))destroy;
 326
 327         /* private functions */
 328         this->build_message = build_message;
 329         this->resend_last_reply = resend_last_reply;
 330         this->create_delete_job = create_delete_job;
 331
 332         /* initialize private fields */
 333         this->logger = global_logger_manager->create_logger(global_logger_manager, IKE_SA, NULL);
 334         if (this->logger ==  NULL)
 335         {
 336                 allocator_free(this);
 337         }
 338
 339         if (ike_sa_id->clone(ike_sa_id,&(this->ike_sa_id)) != SUCCESS)
 340         {
 341                 this->logger->log(this->logger, ERROR, "Fatal error: Could not clone ike_sa_id");
 342                 global_logger_manager->destroy_logger(global_logger_manager,this->logger);
 343                 allocator_free(this);
 344                 return NULL;
 345         }
 346         this->child_sas = linked_list_create();
 347         if (this->child_sas == NULL)
 348         {
 349                 this->logger->log(this->logger, ERROR, "Fatal error: Could not create list for child_sa's");
 350                 this->ike_sa_id->destroy(this->ike_sa_id);
 351                 global_logger_manager->destroy_logger(global_logger_manager,this->logger);
 352                 allocator_free(this);
 353                 return NULL;
 354         }
 355         this->randomizer = randomizer_create();
 356         if (this->randomizer == NULL)
 357         {
 358                 this->logger->log(this->logger, ERROR, "Fatal error: Could not create list for child_sa's");
 359                 this->child_sas->destroy(this->child_sas);
 360                 this->ike_sa_id->destroy(this->ike_sa_id);
 361                 global_logger_manager->destroy_logger(global_logger_manager,this->logger);
 362                 allocator_free(this);
 363         }
 364
 365         this->me.host = NULL;
 366         this->other.host = NULL;
 367         this->last_requested_message = NULL;
 368         this->last_responded_message = NULL;
 369         this->message_id_out = 0;
 370         this->message_id_in = 0;
 371
 372
 373         /* at creation time, IKE_SA is in a initiator state */
 374         if (ike_sa_id->is_initiator(ike_sa_id))
 375         {
 376                 this->current_state = (state_t *) initiator_init_create(this);
 377         }
 378         else
 379         {
 380                 this->current_state = (state_t *) responder_init_create(this);
 381         }
 382
 383
 384         return (&this->public);
 385 }