src/libcharon/plugins/uci/uci_config.c

   1 /*
   2  * Copyright (C) 2008 Thomas Kallenberg
   3  * Copyright (C) 2008 Tobias Brunner
   4  * Copyright (C) 2008 Martin Willi
   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
  18 #define _GNU_SOURCE
  19 #include <string.h>
  20
  21 #include "uci_config.h"
  22 #include "uci_parser.h"
  23
  24 #include <daemon.h>
  25
  26 typedef struct private_uci_config_t private_uci_config_t;
  27
  28 /**
  29  * Private data of an uci_config_t object
  30  */
  31 struct private_uci_config_t {
  32
  33         /**
  34          * Public part
  35          */
  36         uci_config_t public;
  37
  38         /**
  39          * UCI parser context
  40          */
  41         uci_parser_t *parser;
  42 };
  43
  44 /**
  45  * enumerator implementation for create_peer_cfg_enumerator
  46  */
  47 typedef struct {
  48         /** implements enumerator */
  49         enumerator_t public;
  50         /** currently enumerated peer config */
  51         peer_cfg_t *peer_cfg;
  52         /** inner uci_parser section enumerator */
  53         enumerator_t *inner;
  54 } peer_enumerator_t;
  55
  56 /**
  57  * create a proposal from a string, with fallback to default
  58  */
  59 static proposal_t *create_proposal(char *string, protocol_id_t proto)
  60 {
  61         proposal_t *proposal = NULL;
  62
  63         if (string)
  64         {
  65                 proposal = proposal_create_from_string(proto, string);
  66         }
  67         if (!proposal)
  68         {       /* UCI default is aes/sha1 only */
  69                 if (proto == PROTO_IKE)
  70                 {
  71                         proposal = proposal_create_from_string(proto,
  72                                                                 "aes128-aes192-aes256-sha1-modp1536-modp2048");
  73                 }
  74                 else
  75                 {
  76                         proposal = proposal_create_from_string(proto,
  77                                                                 "aes128-aes192-aes256-sha1");
  78                 }
  79         }
  80         return proposal;
  81 }
  82
  83 /**
  84  * create an traffic selector, fallback to dynamic
  85  */
  86 static traffic_selector_t *create_ts(char *string)
  87 {
  88         if (string)
  89         {
  90                 traffic_selector_t *ts;
  91
  92                 ts = traffic_selector_create_from_cidr(string, 0, 0, 65535);
  93                 if (ts)
  94                 {
  95                         return ts;
  96                 }
  97         }
  98         return traffic_selector_create_dynamic(0, 0, 65535);
  99 }
 100
 101 /**
 102  * create a rekey time from a string with hours, with fallback
 103  */
 104 static u_int create_rekey(char *string)
 105 {
 106         u_int rekey = 0;
 107
 108         if (string)
 109         {
 110                 rekey = atoi(string);
 111                 if (rekey)
 112                 {
 113                         return rekey * 3600;
 114                 }
 115         }
 116         /* every 12 hours */
 117         return 12 * 3600;
 118 }
 119
 120 METHOD(enumerator_t, peer_enumerator_enumerate, bool,
 121         peer_enumerator_t *this, peer_cfg_t **cfg)
 122 {
 123         char *name, *ike_proposal, *esp_proposal, *ike_rekey, *esp_rekey;
 124         char *local_id, *local_addr, *local_net;
 125         char *remote_id, *remote_addr, *remote_net;
 126         child_cfg_t *child_cfg;
 127         ike_cfg_t *ike_cfg;
 128         auth_cfg_t *auth;
 129         lifetime_cfg_t lifetime = {
 130                 .time = {
 131                         .life = create_rekey(esp_rekey) + 300,
 132                         .rekey = create_rekey(esp_rekey),
 133                         .jitter = 300
 134                 }
 135         };
 136
 137         /* defaults */
 138         name = "unnamed";
 139         local_id = NULL;
 140         remote_id = NULL;
 141         local_addr = "0.0.0.0";
 142         remote_addr = "0.0.0.0";
 143         local_net = NULL;
 144         remote_net = NULL;
 145         ike_proposal = NULL;
 146         esp_proposal = NULL;
 147         ike_rekey = NULL;
 148         esp_rekey = NULL;
 149
 150         if (this->inner->enumerate(this->inner, &name, &local_id, &remote_id,
 151                         &local_addr, &remote_addr, &local_net, &remote_net,
 152                         &ike_proposal, &esp_proposal, &ike_rekey, &esp_rekey))
 153         {
 154                 DESTROY_IF(this->peer_cfg);
 155                 ike_cfg = ike_cfg_create(IKEV2, FALSE, FALSE,
 156                                                                  local_addr, FALSE,
 157                                                                  charon->socket->get_port(charon->socket, FALSE),
 158                                                                  remote_addr, FALSE, IKEV2_UDP_PORT,
 159                                                                  FRAGMENTATION_NO, 0);
 160                 ike_cfg->add_proposal(ike_cfg, create_proposal(ike_proposal, PROTO_IKE));
 161                 this->peer_cfg = peer_cfg_create(
 162                                         name, ike_cfg, CERT_SEND_IF_ASKED, UNIQUE_NO,
 163                                         1, create_rekey(ike_rekey), 0,  /* keytries, rekey, reauth */
 164                                         1800, 900,                                              /* jitter, overtime */
 165                                         TRUE, FALSE,                            /* mobike, aggressive */
 166                                         60, 0,                                          /* DPD delay, timeout */
 167                                         FALSE, NULL, NULL);                     /* mediation, med by, peer id */
 168                 auth = auth_cfg_create();
 169                 auth->add(auth, AUTH_RULE_AUTH_CLASS, AUTH_CLASS_PSK);
 170                 auth->add(auth, AUTH_RULE_IDENTITY,
 171                                   identification_create_from_string(local_id));
 172                 this->peer_cfg->add_auth_cfg(this->peer_cfg, auth, TRUE);
 173
 174                 auth = auth_cfg_create();
 175                 auth->add(auth, AUTH_RULE_AUTH_CLASS, AUTH_CLASS_PSK);
 176                 if (remote_id)
 177                 {
 178                         auth->add(auth, AUTH_RULE_IDENTITY,
 179                                           identification_create_from_string(remote_id));
 180                 }
 181                 this->peer_cfg->add_auth_cfg(this->peer_cfg, auth, FALSE);
 182
 183                 child_cfg = child_cfg_create(name, &lifetime, NULL, TRUE, MODE_TUNNEL,
 184                                                                          ACTION_NONE, ACTION_NONE, ACTION_NONE,
 185                                                                          FALSE, 0, 0, NULL, NULL, 0);
 186                 child_cfg->add_proposal(child_cfg, create_proposal(esp_proposal, PROTO_ESP));
 187                 child_cfg->add_traffic_selector(child_cfg, TRUE, create_ts(local_net));
 188                 child_cfg->add_traffic_selector(child_cfg, FALSE, create_ts(remote_net));
 189                 this->peer_cfg->add_child_cfg(this->peer_cfg, child_cfg);
 190                 *cfg = this->peer_cfg;
 191                 return TRUE;
 192         }
 193         return FALSE;
 194 }
 195
 196
 197 METHOD(enumerator_t, peer_enumerator_destroy, void,
 198         peer_enumerator_t *this)
 199 {
 200         DESTROY_IF(this->peer_cfg);
 201         this->inner->destroy(this->inner);
 202         free(this);
 203 }
 204
 205 METHOD(backend_t, create_peer_cfg_enumerator, enumerator_t*,
 206         private_uci_config_t *this, identification_t *me, identification_t *other)
 207 {
 208         peer_enumerator_t *e;
 209
 210         INIT(e,
 211                 .public = {
 212                         .enumerate = (void*)_peer_enumerator_enumerate,
 213                         .destroy = _peer_enumerator_destroy,
 214                 },
 215                 .inner = this->parser->create_section_enumerator(this->parser,
 216                                         "local_id", "remote_id", "local_addr", "remote_addr",
 217                                         "local_net", "remote_net", "ike_proposal", "esp_proposal",
 218                                         "ike_rekey", "esp_rekey", NULL),
 219         );
 220         if (!e->inner)
 221         {
 222                 free(e);
 223                 return NULL;
 224         }
 225         return &e->public;
 226 }
 227
 228 /**
 229  * enumerator implementation for create_ike_cfg_enumerator
 230  */
 231 typedef struct {
 232         /** implements enumerator */
 233         enumerator_t public;
 234         /** currently enumerated ike config */
 235         ike_cfg_t *ike_cfg;
 236         /** inner uci_parser section enumerator */
 237         enumerator_t *inner;
 238 } ike_enumerator_t;
 239
 240 METHOD(enumerator_t, ike_enumerator_enumerate, bool,
 241         ike_enumerator_t *this, ike_cfg_t **cfg)
 242 {
 243         char *local_addr, *remote_addr, *ike_proposal;
 244
 245         /* defaults */
 246         local_addr = "0.0.0.0";
 247         remote_addr = "0.0.0.0";
 248         ike_proposal = NULL;
 249
 250         if (this->inner->enumerate(this->inner, NULL,
 251                                                            &local_addr, &remote_addr, &ike_proposal))
 252         {
 253                 DESTROY_IF(this->ike_cfg);
 254                 this->ike_cfg = ike_cfg_create(IKEV2, FALSE, FALSE,
 255                                                                 local_addr, FALSE,
 256                                                                 charon->socket->get_port(charon->socket, FALSE),
 257                                                                 remote_addr, FALSE, IKEV2_UDP_PORT,
 258                                                                 FRAGMENTATION_NO, 0);
 259                 this->ike_cfg->add_proposal(this->ike_cfg,
 260                                                                         create_proposal(ike_proposal, PROTO_IKE));
 261
 262                 *cfg = this->ike_cfg;
 263                 return TRUE;
 264         }
 265         return FALSE;
 266 }
 267
 268 METHOD(enumerator_t, ike_enumerator_destroy, void,
 269         ike_enumerator_t *this)
 270 {
 271         DESTROY_IF(this->ike_cfg);
 272         this->inner->destroy(this->inner);
 273         free(this);
 274 }
 275
 276 METHOD(backend_t, create_ike_cfg_enumerator, enumerator_t*,
 277         private_uci_config_t *this, host_t *me, host_t *other)
 278 {
 279         ike_enumerator_t *e;
 280
 281         INIT(e,
 282                 .public = {
 283                         .enumerate = (void*)_ike_enumerator_enumerate,
 284                         .destroy = _ike_enumerator_destroy,
 285                 },
 286                 .inner = this->parser->create_section_enumerator(this->parser,
 287                                                         "local_addr", "remote_addr", "ike_proposal", NULL),
 288         );
 289         if (!e->inner)
 290         {
 291                 free(e);
 292                 return NULL;
 293         }
 294         return &e->public;
 295 }
 296
 297 METHOD(backend_t, get_peer_cfg_by_name, peer_cfg_t*,
 298         private_uci_config_t *this, char *name)
 299 {
 300         enumerator_t *enumerator;
 301         peer_cfg_t *current, *found = NULL;
 302
 303         enumerator = create_peer_cfg_enumerator(this, NULL, NULL);
 304         if (enumerator)
 305         {
 306                 while (enumerator->enumerate(enumerator, &current))
 307                 {
 308                         if (streq(name, current->get_name(current)))
 309                         {
 310                                 found = current->get_ref(current);
 311                                 break;
 312                         }
 313                 }
 314                 enumerator->destroy(enumerator);
 315         }
 316         return found;
 317 }
 318
 319 METHOD(uci_config_t, destroy, void,
 320         private_uci_config_t *this)
 321 {
 322         free(this);
 323 }
 324
 325 /**
 326  * Described in header.
 327  */
 328 uci_config_t *uci_config_create(uci_parser_t *parser)
 329 {
 330         private_uci_config_t *this;
 331
 332         INIT(this,
 333                 .public = {
 334                         .backend = {
 335                                 .create_peer_cfg_enumerator = _create_peer_cfg_enumerator,
 336                                 .create_ike_cfg_enumerator = _create_ike_cfg_enumerator,
 337                                 .get_peer_cfg_by_name = _get_peer_cfg_by_name,
 338                         },
 339                         .destroy = _destroy,
 340                 },
 341                 .parser = parser,
 342         );
 343
 344         return &this->public;
 345 }