src/charon/config/child_cfg.c

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