src/charon/config/child_cfg.c

   1 /*
   2  * Copyright (C) 2008 Tobias Brunner
   3  * Copyright (C) 2005-2007 Martin Willi
   4  * Copyright (C) 2005 Jan Hutter
   5  * Hochschule fuer Technik Rapperswil
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or (at your
  10  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15  * for more details.
  16  *
  17  * $Id$
  18  */
  19
  20 #include "child_cfg.h"
  21
  22 #include <daemon.h>
  23
  24 ENUM(mode_names, MODE_TRANSPORT, MODE_BEET,
  25         "TRANSPORT",
  26         "TUNNEL",
  27         "2",
  28         "3",
  29         "BEET",
  30 );
  31
  32 ENUM(action_names, ACTION_NONE, ACTION_RESTART,
  33         "ACTION_NONE",
  34         "ACTION_ROUTE",
  35         "ACTION_RESTART",
  36 );
  37
  38 ENUM_BEGIN(ipcomp_transform_names, IPCOMP_NONE, IPCOMP_NONE,
  39         "IPCOMP_NONE");
  40 ENUM_NEXT(ipcomp_transform_names, IPCOMP_OUI, IPCOMP_LZJH, IPCOMP_NONE,
  41         "IPCOMP_OUI",
  42         "IPCOMP_DEFLATE",
  43         "IPCOMP_LZS",
  44         "IPCOMP_LZJH");
  45 ENUM_END(ipcomp_transform_names, IPCOMP_LZJH);
  46
  47 typedef struct private_child_cfg_t private_child_cfg_t;
  48
  49 /**
  50  * Private data of an child_cfg_t object
  51  */
  52 struct private_child_cfg_t {
  53
  54         /**
  55          * Public part
  56          */
  57         child_cfg_t public;
  58
  59         /**
  60          * Number of references hold by others to this child_cfg
  61          */
  62         refcount_t refcount;
  63
  64         /**
  65          * Name of the child_cfg, used to query it
  66          */
  67         char *name;
  68
  69         /**
  70          * list for all proposals
  71          */
  72         linked_list_t *proposals;
  73
  74         /**
  75          * list for traffic selectors for my site
  76          */
  77         linked_list_t *my_ts;
  78
  79         /**
  80          * list for traffic selectors for others site
  81          */
  82         linked_list_t *other_ts;
  83
  84         /**
  85          * updown script
  86          */
  87         char *updown;
  88
  89         /**
  90          * allow host access
  91          */
  92         bool hostaccess;
  93
  94         /**
  95          * Mode to propose for a initiated CHILD: tunnel/transport
  96          */
  97         mode_t mode;
  98
  99         /**
 100          * action to take on DPD
 101          */
 102         action_t dpd_action;
 103
 104         /**
 105          * action to take on CHILD_SA close
 106          */
 107         action_t close_action;
 108
 109         /**
 110          * Time before an SA gets invalid
 111          */
 112         u_int32_t lifetime;
 113
 114         /**
 115          * Time before an SA gets rekeyed
 116          */
 117         u_int32_t rekeytime;
 118
 119         /**
 120          * Time, which specifies the range of a random value
 121          * substracted from rekeytime.
 122          */
 123         u_int32_t jitter;
 124
 125         /**
 126          * enable IPComp
 127          */
 128         bool use_ipcomp;
 129 };
 130
 131 /**
 132  * Implementation of child_cfg_t.get_name
 133  */
 134 static char *get_name(private_child_cfg_t *this)
 135 {
 136         return this->name;
 137 }
 138
 139 /**
 140  * Implementation of child_cfg_t.add_proposal
 141  */
 142 static void add_proposal(private_child_cfg_t *this, proposal_t *proposal)
 143 {
 144         this->proposals->insert_last(this->proposals, proposal);
 145 }
 146
 147 /**
 148  * Implementation of child_cfg_t.get_proposals
 149  */
 150 static linked_list_t* get_proposals(private_child_cfg_t *this, bool strip_dh)
 151 {
 152         enumerator_t *enumerator;
 153         proposal_t *current;
 154         linked_list_t *proposals = linked_list_create();
 155
 156         enumerator = this->proposals->create_enumerator(this->proposals);
 157         while (enumerator->enumerate(enumerator, &current))
 158         {
 159                 current = current->clone(current);
 160                 if (strip_dh)
 161                 {
 162                         current->strip_dh(current);
 163                 }
 164                 proposals->insert_last(proposals, current);
 165         }
 166         enumerator->destroy(enumerator);
 167
 168         return proposals;
 169 }
 170
 171 /**
 172  * Implementation of child_cfg_t.get_name
 173  */
 174 static proposal_t* select_proposal(private_child_cfg_t*this,
 175                                                                    linked_list_t *proposals, bool strip_dh)
 176 {
 177         enumerator_t *stored_enum, *supplied_enum;
 178         proposal_t *stored, *supplied, *selected = NULL;
 179
 180         stored_enum = this->proposals->create_enumerator(this->proposals);
 181         supplied_enum = proposals->create_enumerator(proposals);
 182
 183         /* compare all stored proposals with all supplied. Stored ones are preferred. */
 184         while (stored_enum->enumerate(stored_enum, &stored))
 185         {
 186                 stored = stored->clone(stored);
 187                 while (supplied_enum->enumerate(supplied_enum, &supplied))
 188                 {
 189                         if (strip_dh)
 190                         {
 191                                 stored->strip_dh(stored);
 192                         }
 193                         selected = stored->select(stored, supplied);
 194                         if (selected)
 195                         {
 196                                 break;
 197                         }
 198                 }
 199                 stored->destroy(stored);
 200                 if (selected)
 201                 {
 202                         break;
 203                 }
 204                 supplied_enum->destroy(supplied_enum);
 205                 supplied_enum = proposals->create_enumerator(proposals);
 206         }
 207         stored_enum->destroy(stored_enum);
 208         supplied_enum->destroy(supplied_enum);
 209         return selected;
 210 }
 211
 212 /**
 213  * Implementation of child_cfg_t.get_name
 214  */
 215 static void add_traffic_selector(private_child_cfg_t *this, bool local,
 216                                                                  traffic_selector_t *ts)
 217 {
 218         if (local)
 219         {
 220                 this->my_ts->insert_last(this->my_ts, ts);
 221         }
 222         else
 223         {
 224                 this->other_ts->insert_last(this->other_ts, ts);
 225         }
 226 }
 227
 228 /**
 229  * Implementation of child_cfg_t.get_name
 230  */
 231 static linked_list_t* get_traffic_selectors(private_child_cfg_t *this, bool local,
 232                                                                                         linked_list_t *supplied,
 233                                                                                         host_t *host)
 234 {
 235         enumerator_t *e1, *e2;
 236         traffic_selector_t *ts1, *ts2, *selected;
 237         linked_list_t *result = linked_list_create();
 238
 239         if (local)
 240         {
 241                 e1 = this->my_ts->create_enumerator(this->my_ts);
 242         }
 243         else
 244         {
 245                 e1 = this->other_ts->create_enumerator(this->other_ts);
 246         }
 247
 248         /* no list supplied, just fetch the stored traffic selectors */
 249         if (supplied == NULL)
 250         {
 251                 DBG2(DBG_CFG, "proposing traffic selectors for %s:",
 252                          local ? "us" : "other");
 253                 while (e1->enumerate(e1, &ts1))
 254                 {
 255                         /* we make a copy of the TS, this allows us to update dynamic TS' */
 256                         selected = ts1->clone(ts1);
 257                         if (host)
 258                         {
 259                                 selected->set_address(selected, host);
 260                         }
 261                         DBG2(DBG_CFG, " %R (derived from %R)", selected, ts1);
 262                         result->insert_last(result, selected);
 263                 }
 264                 e1->destroy(e1);
 265         }
 266         else
 267         {
 268                 DBG2(DBG_CFG, "selecting traffic selectors for %s:",
 269                          local ? "us" : "other");
 270                 e2 = supplied->create_enumerator(supplied);
 271                 /* iterate over all stored selectors */
 272                 while (e1->enumerate(e1, &ts1))
 273                 {
 274                         /* we make a copy of the TS, as we have to update dynamic TS' */
 275                         ts1 = ts1->clone(ts1);
 276                         if (host)
 277                         {
 278                                 ts1->set_address(ts1, host);
 279                         }
 280
 281                         /* iterate over all supplied traffic selectors */
 282                         while (e2->enumerate(e2, &ts2))
 283                         {
 284                                 selected = ts1->get_subset(ts1, ts2);
 285                                 if (selected)
 286                                 {
 287                                         DBG2(DBG_CFG, " config: %R, received: %R => match: %R",
 288                                                  ts1, ts2, selected);
 289                                         result->insert_last(result, selected);
 290                                 }
 291                                 else
 292                                 {
 293                                         DBG2(DBG_CFG, " config: %R, received: %R => no match",
 294                                                  ts1, ts2, selected);
 295                                 }
 296                         }
 297                         e2->destroy(e2);
 298                         e2 = supplied->create_enumerator(supplied);
 299                         ts1->destroy(ts1);
 300                 }
 301                 e1->destroy(e1);
 302                 e2->destroy(e2);
 303         }
 304
 305         /* remove any redundant traffic selectors in the list */
 306         e1 = result->create_enumerator(result);
 307         e2 = result->create_enumerator(result);
 308         while (e1->enumerate(e1, &ts1))
 309         {
 310                 while (e2->enumerate(e2, &ts2))
 311                 {
 312                         if (ts1 != ts2)
 313                         {
 314                                 if (ts2->is_contained_in(ts2, ts1))
 315                                 {
 316                                         result->remove_at(result, e2);
 317                                         ts2->destroy(ts2);
 318                                         e1->destroy(e1);
 319                                         e1 = result->create_enumerator(result);
 320                                         break;
 321                                 }
 322                                 if (ts1->is_contained_in(ts1, ts2))
 323                                 {
 324                                         result->remove_at(result, e1);
 325                                         ts1->destroy(ts1);
 326                                         e2->destroy(e2);
 327                                         e2 = result->create_enumerator(result);
 328                                         break;
 329                                 }
 330                         }
 331                 }
 332         }
 333         e1->destroy(e1);
 334         e2->destroy(e2);
 335
 336         return result;
 337 }
 338
 339 /**
 340  * Implementation of child_cfg_t.get_name
 341  */
 342 static char* get_updown(private_child_cfg_t *this)
 343 {
 344         return this->updown;
 345 }
 346
 347 /**
 348  * Implementation of child_cfg_t.get_name
 349  */
 350 static bool get_hostaccess(private_child_cfg_t *this)
 351 {
 352         return this->hostaccess;
 353 }
 354
 355 /**
 356  * Implementation of child_cfg_t.get_name
 357  */
 358 static u_int32_t get_lifetime(private_child_cfg_t *this, bool rekey)
 359 {
 360         if (rekey)
 361         {
 362                 if (this->jitter == 0)
 363                 {
 364                         return this->rekeytime;
 365                 }
 366                 return this->rekeytime - (random() % this->jitter);
 367         }
 368         return this->lifetime;
 369 }
 370
 371 /**
 372  * Implementation of child_cfg_t.get_mode
 373  */
 374 static mode_t get_mode(private_child_cfg_t *this)
 375 {
 376         return this->mode;
 377 }
 378
 379 /**
 380  * Implementation of child_cfg_t.get_dpd_action
 381  */
 382 static action_t get_dpd_action(private_child_cfg_t *this)
 383 {
 384         return this->dpd_action;
 385 }
 386
 387 /**
 388  * Implementation of child_cfg_t.get_close_action
 389  */
 390 static action_t get_close_action(private_child_cfg_t *this)
 391 {
 392         return this->close_action;
 393 }
 394
 395 /**
 396  * Implementation of child_cfg_t.get_dh_group.
 397  */
 398 static diffie_hellman_group_t get_dh_group(private_child_cfg_t *this)
 399 {
 400         enumerator_t *enumerator;
 401         proposal_t *proposal;
 402         u_int16_t dh_group = MODP_NONE;
 403
 404         enumerator = this->proposals->create_enumerator(this->proposals);
 405         while (enumerator->enumerate(enumerator, &proposal))
 406         {
 407                 if (proposal->get_algorithm(proposal, DIFFIE_HELLMAN_GROUP, &dh_group, NULL))
 408                 {
 409                         break;
 410                 }
 411         }
 412         enumerator->destroy(enumerator);
 413         return dh_group;
 414 }
 415
 416 /**
 417  * Implementation of child_cfg_t.use_ipcomp.
 418  */
 419 static bool use_ipcomp(private_child_cfg_t *this)
 420 {
 421         return this->use_ipcomp;
 422 }
 423
 424 /**
 425  * Implementation of child_cfg_t.get_name
 426  */
 427 static child_cfg_t* get_ref(private_child_cfg_t *this)
 428 {
 429         ref_get(&this->refcount);
 430         return &this->public;
 431 }
 432
 433 /**
 434  * Implements child_cfg_t.destroy.
 435  */
 436 static void destroy(private_child_cfg_t *this)
 437 {
 438         if (ref_put(&this->refcount))
 439         {
 440                 this->proposals->destroy_offset(this->proposals, offsetof(proposal_t, destroy));
 441                 this->my_ts->destroy_offset(this->my_ts, offsetof(traffic_selector_t, destroy));
 442                 this->other_ts->destroy_offset(this->other_ts, offsetof(traffic_selector_t, destroy));
 443                 if (this->updown)
 444                 {
 445                         free(this->updown);
 446                 }
 447                 free(this->name);
 448                 free(this);
 449         }
 450 }
 451
 452 /*
 453  * Described in header-file
 454  */
 455 child_cfg_t *child_cfg_create(char *name, u_int32_t lifetime,
 456                                                           u_int32_t rekeytime, u_int32_t jitter,
 457                                                           char *updown, bool hostaccess, mode_t mode,
 458                                                           action_t dpd_action, action_t close_action, bool ipcomp)
 459 {
 460         private_child_cfg_t *this = malloc_thing(private_child_cfg_t);
 461
 462         this->public.get_name = (char* (*) (child_cfg_t*))get_name;
 463         this->public.add_traffic_selector = (void (*)(child_cfg_t*,bool,traffic_selector_t*))add_traffic_selector;
 464         this->public.get_traffic_selectors = (linked_list_t*(*)(child_cfg_t*,bool,linked_list_t*,host_t*))get_traffic_selectors;
 465         this->public.add_proposal = (void (*) (child_cfg_t*,proposal_t*))add_proposal;
 466         this->public.get_proposals = (linked_list_t* (*) (child_cfg_t*,bool))get_proposals;
 467         this->public.select_proposal = (proposal_t* (*) (child_cfg_t*,linked_list_t*,bool))select_proposal;
 468         this->public.get_updown = (char* (*) (child_cfg_t*))get_updown;
 469         this->public.get_hostaccess = (bool (*) (child_cfg_t*))get_hostaccess;
 470         this->public.get_mode = (mode_t (*) (child_cfg_t *))get_mode;
 471         this->public.get_dpd_action = (action_t (*) (child_cfg_t *))get_dpd_action;
 472         this->public.get_close_action = (action_t (*) (child_cfg_t *))get_close_action;
 473         this->public.get_lifetime = (u_int32_t (*) (child_cfg_t *,bool))get_lifetime;
 474         this->public.get_dh_group = (diffie_hellman_group_t(*)(child_cfg_t*)) get_dh_group;
 475         this->public.use_ipcomp = (bool (*) (child_cfg_t *))use_ipcomp;
 476         this->public.get_ref = (child_cfg_t* (*) (child_cfg_t*))get_ref;
 477         this->public.destroy = (void (*) (child_cfg_t*))destroy;
 478
 479         this->name = strdup(name);
 480         this->lifetime = lifetime;
 481         this->rekeytime = rekeytime;
 482         this->jitter = jitter;
 483         this->updown = updown ? strdup(updown) : NULL;
 484         this->hostaccess = hostaccess;
 485         this->mode = mode;
 486         this->dpd_action = dpd_action;
 487         this->close_action = close_action;
 488         this->use_ipcomp = ipcomp;
 489         this->refcount = 1;
 490         this->proposals = linked_list_create();
 491         this->my_ts = linked_list_create();
 492         this->other_ts = linked_list_create();
 493
 494         return &this->public;
 495 }
 496