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, IKEV2_UDP_PORT, remote_addr, IKEV2_UDP_PORT);
 173                 ike_cfg->add_proposal(ike_cfg, create_proposal(ike_proposal, PROTO_IKE));
 174                 this->peer_cfg = peer_cfg_create(
 175                                         name, IKEV2, ike_cfg, CERT_SEND_IF_ASKED, UNIQUE_NO,
 176                                         1, create_rekey(ike_rekey), 0,  /* keytries, rekey, reauth */
 177                                         1800, 900,                                              /* jitter, overtime */
 178                                         TRUE, FALSE, 60,                        /* mobike, aggr., dpddelay */
 179                                         NULL, NULL,                                     /* vip, pool */
 180                                         FALSE, NULL, NULL);                     /* mediation, med by, peer id */
 181                 auth = auth_cfg_create();
 182                 auth->add(auth, AUTH_RULE_AUTH_CLASS, AUTH_CLASS_PSK);
 183                 auth->add(auth, AUTH_RULE_IDENTITY,
 184                                   identification_create_from_string(local_id));
 185                 this->peer_cfg->add_auth_cfg(this->peer_cfg, auth, TRUE);
 186
 187                 auth = auth_cfg_create();
 188                 auth->add(auth, AUTH_RULE_AUTH_CLASS, AUTH_CLASS_PSK);
 189                 if (remote_id)
 190                 {
 191                         auth->add(auth, AUTH_RULE_IDENTITY,
 192                                           identification_create_from_string(remote_id));
 193                 }
 194                 this->peer_cfg->add_auth_cfg(this->peer_cfg, auth, FALSE);
 195
 196                 child_cfg = child_cfg_create(name, &lifetime, NULL, TRUE, MODE_TUNNEL,
 197                                                                          ACTION_NONE, ACTION_NONE, ACTION_NONE,
 198                                                                          FALSE, 0, 0, NULL, NULL, 0);
 199                 child_cfg->add_proposal(child_cfg, create_proposal(esp_proposal, PROTO_ESP));
 200                 child_cfg->add_traffic_selector(child_cfg, TRUE, create_ts(local_net));
 201                 child_cfg->add_traffic_selector(child_cfg, FALSE, create_ts(remote_net));
 202                 this->peer_cfg->add_child_cfg(this->peer_cfg, child_cfg);
 203                 *cfg = this->peer_cfg;
 204                 return TRUE;
 205         }
 206         return FALSE;
 207 }
 208
 209
 210 METHOD(enumerator_t, peer_enumerator_destroy, void,
 211         peer_enumerator_t *this)
 212 {
 213         DESTROY_IF(this->peer_cfg);
 214         this->inner->destroy(this->inner);
 215         free(this);
 216 }
 217
 218 METHOD(backend_t, create_peer_cfg_enumerator, enumerator_t*,
 219         private_uci_config_t *this, identification_t *me, identification_t *other)
 220 {
 221         peer_enumerator_t *e;
 222
 223         INIT(e,
 224                 .public = {
 225                         .enumerate = (void*)_peer_enumerator_enumerate,
 226                         .destroy = _peer_enumerator_destroy,
 227                 },
 228                 .inner = this->parser->create_section_enumerator(this->parser,
 229                                         "local_id", "remote_id", "local_addr", "remote_addr",
 230                                         "local_net", "remote_net", "ike_proposal", "esp_proposal",
 231                                         "ike_rekey", "esp_rekey", NULL),
 232         );
 233         if (!e->inner)
 234         {
 235                 free(e);
 236                 return NULL;
 237         }
 238         return &e->public;
 239 }
 240
 241 /**
 242  * enumerator implementation for create_ike_cfg_enumerator
 243  */
 244 typedef struct {
 245         /** implements enumerator */
 246         enumerator_t public;
 247         /** currently enumerated ike config */
 248         ike_cfg_t *ike_cfg;
 249         /** inner uci_parser section enumerator */
 250         enumerator_t *inner;
 251 } ike_enumerator_t;
 252
 253 METHOD(enumerator_t, ike_enumerator_enumerate, bool,
 254         ike_enumerator_t *this, ike_cfg_t **cfg)
 255 {
 256         char *local_addr, *remote_addr, *ike_proposal;
 257
 258         /* defaults */
 259         local_addr = "0.0.0.0";
 260         remote_addr = "0.0.0.0";
 261         ike_proposal = NULL;
 262
 263         if (this->inner->enumerate(this->inner, NULL,
 264                                                            &local_addr, &remote_addr, &ike_proposal))
 265         {
 266                 DESTROY_IF(this->ike_cfg);
 267                 this->ike_cfg = ike_cfg_create(FALSE, FALSE, local_addr, IKEV2_UDP_PORT,
 268                                                                                 remote_addr, IKEV2_UDP_PORT);
 269                 this->ike_cfg->add_proposal(this->ike_cfg,
 270                                                                         create_proposal(ike_proposal, PROTO_IKE));
 271
 272                 *cfg = this->ike_cfg;
 273                 return TRUE;
 274         }
 275         return FALSE;
 276 }
 277
 278 METHOD(enumerator_t, ike_enumerator_destroy, void,
 279         ike_enumerator_t *this)
 280 {
 281         DESTROY_IF(this->ike_cfg);
 282         this->inner->destroy(this->inner);
 283         free(this);
 284 }
 285
 286 METHOD(backend_t, create_ike_cfg_enumerator, enumerator_t*,
 287         private_uci_config_t *this, host_t *me, host_t *other)
 288 {
 289         ike_enumerator_t *e;
 290
 291         INIT(e,
 292                 .public = {
 293                         .enumerate = (void*)_ike_enumerator_enumerate,
 294                         .destroy = _ike_enumerator_destroy,
 295                 },
 296                 .inner = this->parser->create_section_enumerator(this->parser,
 297                                                         "local_addr", "remote_addr", "ike_proposal", NULL),
 298         );
 299         if (!e->inner)
 300         {
 301                 free(e);
 302                 return NULL;
 303         }
 304         return &e->public;
 305 }
 306
 307 METHOD(backend_t, get_peer_cfg_by_name, peer_cfg_t*,
 308         private_uci_config_t *this, char *name)
 309 {
 310         enumerator_t *enumerator;
 311         peer_cfg_t *current, *found = NULL;
 312
 313         enumerator = create_peer_cfg_enumerator(this, NULL, NULL);
 314         if (enumerator)
 315         {
 316                 while (enumerator->enumerate(enumerator, &current))
 317                 {
 318                         if (streq(name, current->get_name(current)))
 319                         {
 320                                 found = current->get_ref(current);
 321                                 break;
 322                         }
 323                 }
 324                 enumerator->destroy(enumerator);
 325         }
 326         return found;
 327 }
 328
 329 METHOD(uci_config_t, destroy, void,
 330         private_uci_config_t *this)
 331 {
 332         free(this);
 333 }
 334
 335 /**
 336  * Described in header.
 337  */
 338 uci_config_t *uci_config_create(uci_parser_t *parser)
 339 {
 340         private_uci_config_t *this;
 341
 342         INIT(this,
 343                 .public = {
 344                         .backend = {
 345                                 .create_peer_cfg_enumerator = _create_peer_cfg_enumerator,
 346                                 .create_ike_cfg_enumerator = _create_ike_cfg_enumerator,
 347                                 .get_peer_cfg_by_name = _get_peer_cfg_by_name,
 348                         },
 349                         .destroy = _destroy,
 350                 },
 351                 .parser = parser,
 352         );
 353
 354         return &this->public;
 355 }
 356