src/charon/sa/tasks/ike_config.c

   1 /**
   2  * @file ike_config.c
   3  *
   4  * @brief Implementation of the ike_config task.
   5  *
   6  */
   7
   8 /*
   9  * Copyright (C) 2007 Martin Willi
  10  * Copyright (C) 2006-2007 Fabian Hartmann, Noah Heusser
  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_config.h"
  25
  26 #include <daemon.h>
  27 #include <encoding/payloads/cp_payload.h>
  28
  29 typedef struct private_ike_config_t private_ike_config_t;
  30
  31 /**
  32  * Private members of a ike_config_t task.
  33  */
  34 struct private_ike_config_t {
  35
  36         /**
  37          * Public methods and task_t interface.
  38          */
  39         ike_config_t public;
  40
  41         /**
  42          * Assigned IKE_SA.
  43          */
  44         ike_sa_t *ike_sa;
  45
  46         /**
  47          * Are we the initiator?
  48          */
  49         bool initiator;
  50
  51         /**
  52          * virtual ip
  53          */
  54         host_t *virtual_ip;
  55
  56         /**
  57          * list of DNS servers
  58          */
  59         linked_list_t *dns;
  60 };
  61
  62 /**
  63  * build configuration payloads and attributes
  64  */
  65 static void build_payloads(private_ike_config_t *this, message_t *message,
  66                                                    config_type_t type)
  67 {
  68         cp_payload_t *cp;
  69         configuration_attribute_t *ca;
  70         chunk_t chunk, prefix;
  71
  72         if (!this->virtual_ip)
  73         {
  74                 return;
  75         }
  76
  77         cp = cp_payload_create();
  78         cp->set_config_type(cp, type);
  79
  80         ca = configuration_attribute_create();
  81
  82         if (this->virtual_ip->get_family(this->virtual_ip) == AF_INET)
  83         {
  84                 ca->set_type(ca, INTERNAL_IP4_ADDRESS);
  85                 if (this->virtual_ip->is_anyaddr(this->virtual_ip))
  86                 {
  87                         chunk = chunk_empty;
  88                 }
  89                 else
  90                 {
  91                         chunk = this->virtual_ip->get_address(this->virtual_ip);
  92                 }
  93         }
  94         else
  95         {
  96                 ca->set_type(ca, INTERNAL_IP6_ADDRESS);
  97                 if (this->virtual_ip->is_anyaddr(this->virtual_ip))
  98                 {
  99                         chunk = chunk_empty;
 100                 }
 101                 else
 102                 {
 103                         prefix = chunk_alloca(1);
 104                         *prefix.ptr = 64;
 105                         chunk = this->virtual_ip->get_address(this->virtual_ip);
 106                         chunk = chunk_cata("cc", chunk, prefix);
 107                 }
 108         }
 109         ca->set_value(ca, chunk);
 110         cp->add_configuration_attribute(cp, ca);
 111
 112         /* we currently always add a DNS request if we request an IP */
 113         if (this->initiator)
 114         {
 115                 ca = configuration_attribute_create();
 116                 if (this->virtual_ip->get_family(this->virtual_ip) == AF_INET)
 117                 {
 118                         ca->set_type(ca, INTERNAL_IP4_DNS);
 119                 }
 120                 else
 121                 {
 122                         ca->set_type(ca, INTERNAL_IP6_DNS);
 123                 }
 124                 cp->add_configuration_attribute(cp, ca);
 125         }
 126         else
 127         {
 128                 host_t *ip;
 129                 iterator_t *iterator = this->dns->create_iterator(this->dns, TRUE);
 130                 while (iterator->iterate(iterator, (void**)&ip))
 131                 {
 132                         ca = configuration_attribute_create();
 133                         if (ip->get_family(ip) == AF_INET)
 134                         {
 135                                 ca->set_type(ca, INTERNAL_IP4_DNS);
 136                         }
 137                         else
 138                         {
 139                                 ca->set_type(ca, INTERNAL_IP6_DNS);
 140                         }
 141                         chunk = ip->get_address(ip);
 142                         ca->set_value(ca, chunk);
 143                         cp->add_configuration_attribute(cp, ca);
 144                 }
 145                 iterator->destroy(iterator);
 146         }
 147         message->add_payload(message, (payload_t*)cp);
 148 }
 149
 150 /**
 151  * process a single configuration attribute
 152  */
 153 static void process_attribute(private_ike_config_t *this,
 154                                                           configuration_attribute_t *ca)
 155 {
 156         host_t *ip;
 157         chunk_t addr;
 158         int family = AF_INET6;
 159
 160         switch (ca->get_type(ca))
 161         {
 162                 case INTERNAL_IP4_ADDRESS:
 163                         family = AF_INET;
 164                         /* fall */
 165                 case INTERNAL_IP6_ADDRESS:
 166                 {
 167                         addr = ca->get_value(ca);
 168                         if (addr.len == 0)
 169                         {
 170                                 ip = host_create_any(family);
 171                         }
 172                         else
 173                         {
 174                                 /* skip prefix byte in IPv6 payload*/
 175                                 if (family == AF_INET6)
 176                                 {
 177                                         addr.len--;
 178                                 }
 179                                 ip = host_create_from_chunk(family, addr, 0);
 180                         }
 181                         if (ip && !this->virtual_ip)
 182                         {
 183                                 this->virtual_ip = ip;
 184                         }
 185                         break;
 186                 }
 187                 case INTERNAL_IP4_DNS:
 188                         family = AF_INET;
 189                         /* fall */
 190                 case INTERNAL_IP6_DNS:
 191                 {
 192                         addr = ca->get_value(ca);
 193                         if (addr.len == 0)
 194                         {
 195                                 ip = host_create_any(family);
 196                         }
 197                         else
 198                         {
 199                                 ip = host_create_from_chunk(family, addr, 0);
 200                         }
 201                         if (ip)
 202                         {
 203                                 this->dns->insert_last(this->dns, ip);
 204                         }
 205                         break;
 206                 }
 207                 case INTERNAL_IP4_NBNS:
 208                 case INTERNAL_IP6_NBNS:
 209                         /* TODO */
 210                 default:
 211                         DBG1(DBG_IKE, "ignoring %N config attribute",
 212                                  configuration_attribute_type_names,
 213                                  ca->get_type(ca));
 214                         break;
 215         }
 216 }
 217
 218 /**
 219  * Scan for configuration payloads and attributes
 220  */
 221 static void process_payloads(private_ike_config_t *this, message_t *message)
 222 {
 223         iterator_t *iterator, *attributes;
 224         payload_t *payload;
 225
 226         iterator = message->get_payload_iterator(message);
 227         while (iterator->iterate(iterator, (void**)&payload))
 228         {
 229                 if (payload->get_type(payload) == CONFIGURATION)
 230                 {
 231                         cp_payload_t *cp = (cp_payload_t*)payload;
 232                         configuration_attribute_t *ca;
 233                         switch (cp->get_config_type(cp))
 234                         {
 235                                 case CFG_REQUEST:
 236                                 case CFG_REPLY:
 237                                 {
 238                                         attributes = cp->create_attribute_iterator(cp);
 239                                         while (attributes->iterate(attributes, (void**)&ca))
 240                                         {
 241                                                 process_attribute(this, ca);
 242                                         }
 243                                         attributes->destroy(attributes);
 244                                         break;
 245                                 }
 246                                 default:
 247                                         DBG1(DBG_IKE, "ignoring %N config payload",
 248                                                  config_type_names, cp->get_config_type(cp));
 249                                         break;
 250                         }
 251                 }
 252         }
 253         iterator->destroy(iterator);
 254 }
 255
 256 /**
 257  * Implementation of task_t.process for initiator
 258  */
 259 static status_t build_i(private_ike_config_t *this, message_t *message)
 260 {
 261         if (message->get_exchange_type(message) == IKE_AUTH &&
 262                 message->get_payload(message, ID_INITIATOR))
 263         {
 264                 peer_cfg_t *config;
 265                 host_t *vip;
 266
 267                 /* reuse virtual IP if we already have one */
 268                 vip = this->ike_sa->get_virtual_ip(this->ike_sa, TRUE);
 269                 if (vip)
 270                 {
 271                         this->virtual_ip = vip->clone(vip);
 272                 }
 273                 else
 274                 {
 275                         config = this->ike_sa->get_peer_cfg(this->ike_sa);
 276                         this->virtual_ip = config->get_my_virtual_ip(config);
 277                 }
 278
 279                 build_payloads(this, message, CFG_REQUEST);
 280         }
 281
 282         return NEED_MORE;
 283 }
 284
 285 /**
 286  * Implementation of task_t.process for responder
 287  */
 288 static status_t process_r(private_ike_config_t *this, message_t *message)
 289 {
 290         if (message->get_exchange_type(message) == IKE_AUTH &&
 291                 message->get_payload(message, ID_INITIATOR))
 292         {
 293                 process_payloads(this, message);
 294         }
 295         return NEED_MORE;
 296 }
 297
 298 /**
 299  * Implementation of task_t.build for responder
 300  */
 301 static status_t build_r(private_ike_config_t *this, message_t *message)
 302 {
 303         if (message->get_exchange_type(message) == IKE_AUTH &&
 304                 message->get_payload(message, EXTENSIBLE_AUTHENTICATION) == NULL)
 305         {
 306                 peer_cfg_t *config = this->ike_sa->get_peer_cfg(this->ike_sa);
 307
 308                 if (config && this->virtual_ip)
 309                 {
 310                         host_t *ip;
 311
 312                         DBG1(DBG_IKE, "peer requested virtual IP %H", this->virtual_ip);
 313                         ip = config->get_other_virtual_ip(config, this->virtual_ip);
 314                         if (ip == NULL || ip->is_anyaddr(ip))
 315                         {
 316                                 DBG1(DBG_IKE, "not assigning a virtual IP to peer");
 317                                 DESTROY_IF(ip);
 318                                 return SUCCESS;
 319                         }
 320                         DBG1(DBG_IKE, "assigning virtual IP %H to peer", ip);
 321                         this->ike_sa->set_virtual_ip(this->ike_sa, FALSE, ip);
 322
 323                         this->virtual_ip->destroy(this->virtual_ip);
 324                         this->virtual_ip = ip;
 325
 326                         /* DNS testing values
 327                         if (this->dns->remove_last(this->dns, (void**)&ip) == SUCCESS)
 328                         {
 329                                 ip->destroy(ip);
 330                                 ip = host_create_from_string("10.3.0.1", 0);
 331                                 this->dns->insert_last(this->dns, ip);
 332                                 ip = host_create_from_string("10.3.0.2", 0);
 333                                 this->dns->insert_last(this->dns, ip);
 334                         } */
 335
 336                         build_payloads(this, message, CFG_REPLY);
 337                 }
 338                 return SUCCESS;
 339         }
 340         return NEED_MORE;
 341 }
 342
 343 /**
 344  * Implementation of task_t.process for initiator
 345  */
 346 static status_t process_i(private_ike_config_t *this, message_t *message)
 347 {
 348         if (message->get_exchange_type(message) == IKE_AUTH &&
 349                 !message->get_payload(message, EXTENSIBLE_AUTHENTICATION))
 350         {
 351                 host_t *ip;
 352                 peer_cfg_t *config;
 353
 354                 DESTROY_IF(this->virtual_ip);
 355                 this->virtual_ip = NULL;
 356
 357                 process_payloads(this, message);
 358
 359                 if (this->virtual_ip == NULL)
 360                 {       /* force a configured virtual IP, even server didn't return one */
 361                         config = this->ike_sa->get_peer_cfg(this->ike_sa);
 362                         this->virtual_ip = config->get_my_virtual_ip(config);
 363                 }
 364
 365                 if (this->virtual_ip && !this->virtual_ip->is_anyaddr(this->virtual_ip))
 366                 {
 367                         this->ike_sa->set_virtual_ip(this->ike_sa, TRUE, this->virtual_ip);
 368
 369                         while (this->dns->remove_last(this->dns, (void**)&ip) == SUCCESS)
 370                         {
 371                                 if (!ip->is_anyaddr(ip))
 372                                 {
 373                                         this->ike_sa->add_dns_server(this->ike_sa, ip);
 374                                 }
 375                                 ip->destroy(ip);
 376                         }
 377                 }
 378                 return SUCCESS;
 379         }
 380         return NEED_MORE;
 381 }
 382
 383 /**
 384  * Implementation of task_t.get_type
 385  */
 386 static task_type_t get_type(private_ike_config_t *this)
 387 {
 388         return IKE_CONFIG;
 389 }
 390
 391 /**
 392  * Implementation of task_t.migrate
 393  */
 394 static void migrate(private_ike_config_t *this, ike_sa_t *ike_sa)
 395 {
 396         DESTROY_IF(this->virtual_ip);
 397         this->dns->destroy_offset(this->dns, offsetof(host_t, destroy));
 398
 399         this->ike_sa = ike_sa;
 400         this->virtual_ip = NULL;
 401         this->dns = linked_list_create();
 402 }
 403
 404 /**
 405  * Implementation of task_t.destroy
 406  */
 407 static void destroy(private_ike_config_t *this)
 408 {
 409         DESTROY_IF(this->virtual_ip);
 410         this->dns->destroy_offset(this->dns, offsetof(host_t, destroy));
 411         free(this);
 412 }
 413
 414 /*
 415  * Described in header.
 416  */
 417 ike_config_t *ike_config_create(ike_sa_t *ike_sa, bool initiator)
 418 {
 419         private_ike_config_t *this = malloc_thing(private_ike_config_t);
 420
 421         this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
 422         this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
 423         this->public.task.destroy = (void(*)(task_t*))destroy;
 424
 425         if (initiator)
 426         {
 427                 this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
 428                 this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
 429         }
 430         else
 431         {
 432                 this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
 433                 this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
 434         }
 435         this->initiator = initiator;
 436         this->ike_sa = ike_sa;
 437         this->virtual_ip = NULL;
 438         this->dns = linked_list_create();
 439
 440         return &this->public;
 441 }