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                 int netbits = 32;
  91                 host_t *net;
  92                 char *pos;
  93
  94                 string = strdupa(string);
  95                 pos = strchr(string, '/');
  96                 if (pos)
  97                 {
  98                         *pos++ = '\0';
  99                         netbits = atoi(pos);
 100                 }
 101                 else
 102                 {
 103                         if (strchr(string, ':'))
 104                         {
 105                                 netbits = 128;
 106                         }
 107                 }
 108                 net = host_create_from_string(string, 0);
 109                 if (net)
 110                 {
 111                         return traffic_selector_create_from_subnet(net, netbits, 0, 0);
 112                 }
 113         }
 114         return traffic_selector_create_dynamic(0, 0, 65535);
 115 }
 116
 117 /**
 118  * create a rekey time from a string with hours, with fallback
 119  */
 120 static u_int create_rekey(char *string)
 121 {
 122         u_int rekey = 0;
 123
 124         if (string)
 125         {
 126                 rekey = atoi(string);
 127                 if (rekey)
 128                 {
 129                         return rekey * 3600;
 130                 }
 131         }
 132         /* every 12 hours */
 133         return 12 * 3600;
 134 }
 135
 136 METHOD(enumerator_t, peer_enumerator_enumerate, bool,
 137         peer_enumerator_t *this, peer_cfg_t **cfg)
 138 {
 139         char *name, *ike_proposal, *esp_proposal, *ike_rekey, *esp_rekey;
 140         char *local_id, *local_addr, *local_net;
 141         char *remote_id, *remote_addr, *remote_net;
 142         child_cfg_t *child_cfg;
 143         ike_cfg_t *ike_cfg;
 144         auth_cfg_t *auth;
 145         lifetime_cfg_t lifetime = {
 146                 .time = {
 147                         .life = create_rekey(esp_rekey) + 300,
 148                         .rekey = create_rekey(esp_rekey),
 149                         .jitter = 300
 150                 }
 151         };
 152
 153         /* defaults */
 154         name = "unnamed";
 155         local_id = NULL;
 156         remote_id = NULL;
 157         local_addr = "0.0.0.0";
 158         remote_addr = "0.0.0.0";
 159         local_net = NULL;
 160         remote_net = NULL;
 161         ike_proposal = NULL;
 162         esp_proposal = NULL;
 163         ike_rekey = NULL;
 164         esp_rekey = NULL;
 165
 166         if (this->inner->enumerate(this->inner, &name, &local_id, &remote_id,
 167                         &local_addr, &remote_addr, &local_net, &remote_net,
 168                         &ike_proposal, &esp_proposal, &ike_rekey, &esp_rekey))
 169         {
 170                 DESTROY_IF(this->peer_cfg);
 171                 ike_cfg = ike_cfg_create(FALSE, FALSE,
 172                                                                  local_addr, FALSE, IKEV2_UDP_PORT,
 173                                                                  remote_addr, FALSE, IKEV2_UDP_PORT);
 174                 ike_cfg->add_proposal(ike_cfg, create_proposal(ike_proposal, PROTO_IKE));
 175                 this->peer_cfg = peer_cfg_create(
 176                                         name, IKEV2, ike_cfg, CERT_SEND_IF_ASKED, UNIQUE_NO,
 177                                         1, create_rekey(ike_rekey), 0,  /* keytries, rekey, reauth */
 178                                         1800, 900,                                              /* jitter, overtime */
 179                                         TRUE, FALSE,                            /* mobike, aggressive */
 180                                         60, 0,                                          /* DPD delay, timeout */
 181                                         NULL, NULL,                                     /* vip, pool */
 182                                         FALSE, NULL, NULL);                     /* mediation, med by, peer id */
 183                 auth = auth_cfg_create();
 184                 auth->add(auth, AUTH_RULE_AUTH_CLASS, AUTH_CLASS_PSK);
 185                 auth->add(auth, AUTH_RULE_IDENTITY,
 186                                   identification_create_from_string(local_id));
 187                 this->peer_cfg->add_auth_cfg(this->peer_cfg, auth, TRUE);
 188
 189                 auth = auth_cfg_create();
 190                 auth->add(auth, AUTH_RULE_AUTH_CLASS, AUTH_CLASS_PSK);
 191                 if (remote_id)
 192                 {
 193                         auth->add(auth, AUTH_RULE_IDENTITY,
 194                                           identification_create_from_string(remote_id));
 195                 }
 196                 this->peer_cfg->add_auth_cfg(this->peer_cfg, auth, FALSE);
 197
 198                 child_cfg = child_cfg_create(name, &lifetime, NULL, TRUE, MODE_TUNNEL,
 199                                                                          ACTION_NONE, ACTION_NONE, ACTION_NONE,
 200                                                                          FALSE, 0, 0, NULL, NULL, 0);
 201                 child_cfg->add_proposal(child_cfg, create_proposal(esp_proposal, PROTO_ESP));
 202                 child_cfg->add_traffic_selector(child_cfg, TRUE, create_ts(local_net));
 203                 child_cfg->add_traffic_selector(child_cfg, FALSE, create_ts(remote_net));
 204                 this->peer_cfg->add_child_cfg(this->peer_cfg, child_cfg);
 205                 *cfg = this->peer_cfg;
 206                 return TRUE;
 207         }
 208         return FALSE;
 209 }
 210
 211
 212 METHOD(enumerator_t, peer_enumerator_destroy, void,
 213         peer_enumerator_t *this)
 214 {
 215         DESTROY_IF(this->peer_cfg);
 216         this->inner->destroy(this->inner);
 217         free(this);
 218 }
 219
 220 METHOD(backend_t, create_peer_cfg_enumerator, enumerator_t*,
 221         private_uci_config_t *this, identification_t *me, identification_t *other)
 222 {
 223         peer_enumerator_t *e;
 224
 225         INIT(e,
 226                 .public = {
 227                         .enumerate = (void*)_peer_enumerator_enumerate,
 228                         .destroy = _peer_enumerator_destroy,
 229                 },
 230                 .inner = this->parser->create_section_enumerator(this->parser,
 231                                         "local_id", "remote_id", "local_addr", "remote_addr",
 232                                         "local_net", "remote_net", "ike_proposal", "esp_proposal",
 233                                         "ike_rekey", "esp_rekey", NULL),
 234         );
 235         if (!e->inner)
 236         {
 237                 free(e);
 238                 return NULL;
 239         }
 240         return &e->public;
 241 }
 242
 243 /**
 244  * enumerator implementation for create_ike_cfg_enumerator
 245  */
 246 typedef struct {
 247         /** implements enumerator */
 248         enumerator_t public;
 249         /** currently enumerated ike config */
 250         ike_cfg_t *ike_cfg;
 251         /** inner uci_parser section enumerator */
 252         enumerator_t *inner;
 253 } ike_enumerator_t;
 254
 255 METHOD(enumerator_t, ike_enumerator_enumerate, bool,
 256         ike_enumerator_t *this, ike_cfg_t **cfg)
 257 {
 258         char *local_addr, *remote_addr, *ike_proposal;
 259
 260         /* defaults */
 261         local_addr = "0.0.0.0";
 262         remote_addr = "0.0.0.0";
 263         ike_proposal = NULL;
 264
 265         if (this->inner->enumerate(this->inner, NULL,
 266                                                            &local_addr, &remote_addr, &ike_proposal))
 267         {
 268                 DESTROY_IF(this->ike_cfg);
 269                 this->ike_cfg = ike_cfg_create(FALSE, FALSE,
 270                                                                            local_addr, FALSE, IKEV2_UDP_PORT,
 271                                                                            remote_addr, FALSE, IKEV2_UDP_PORT);
 272                 this->ike_cfg->add_proposal(this->ike_cfg,
 273                                                                         create_proposal(ike_proposal, PROTO_IKE));
 274
 275                 *cfg = this->ike_cfg;
 276                 return TRUE;
 277         }
 278         return FALSE;
 279 }
 280
 281 METHOD(enumerator_t, ike_enumerator_destroy, void,
 282         ike_enumerator_t *this)
 283 {
 284         DESTROY_IF(this->ike_cfg);
 285         this->inner->destroy(this->inner);
 286         free(this);
 287 }
 288
 289 METHOD(backend_t, create_ike_cfg_enumerator, enumerator_t*,
 290         private_uci_config_t *this, host_t *me, host_t *other)
 291 {
 292         ike_enumerator_t *e;
 293
 294         INIT(e,
 295                 .public = {
 296                         .enumerate = (void*)_ike_enumerator_enumerate,
 297                         .destroy = _ike_enumerator_destroy,
 298                 },
 299                 .inner = this->parser->create_section_enumerator(this->parser,
 300                                                         "local_addr", "remote_addr", "ike_proposal", NULL),
 301         );
 302         if (!e->inner)
 303         {
 304                 free(e);
 305                 return NULL;
 306         }
 307         return &e->public;
 308 }
 309
 310 METHOD(backend_t, get_peer_cfg_by_name, peer_cfg_t*,
 311         private_uci_config_t *this, char *name)
 312 {
 313         enumerator_t *enumerator;
 314         peer_cfg_t *current, *found = NULL;
 315
 316         enumerator = create_peer_cfg_enumerator(this, NULL, NULL);
 317         if (enumerator)
 318         {
 319                 while (enumerator->enumerate(enumerator, &current))
 320                 {
 321                         if (streq(name, current->get_name(current)))
 322                         {
 323                                 found = current->get_ref(current);
 324                                 break;
 325                         }
 326                 }
 327                 enumerator->destroy(enumerator);
 328         }
 329         return found;
 330 }
 331
 332 METHOD(uci_config_t, destroy, void,
 333         private_uci_config_t *this)
 334 {
 335         free(this);
 336 }
 337
 338 /**
 339  * Described in header.
 340  */
 341 uci_config_t *uci_config_create(uci_parser_t *parser)
 342 {
 343         private_uci_config_t *this;
 344
 345         INIT(this,
 346                 .public = {
 347                         .backend = {
 348                                 .create_peer_cfg_enumerator = _create_peer_cfg_enumerator,
 349                                 .create_ike_cfg_enumerator = _create_ike_cfg_enumerator,
 350                                 .get_peer_cfg_by_name = _get_peer_cfg_by_name,
 351                         },
 352                         .destroy = _destroy,
 353                 },
 354                 .parser = parser,
 355         );
 356
 357         return &this->public;
 358 }
 359