src/libcharon/config/peer_cfg.h

   1 /*
   2  * Copyright (C) 2007-2008 Tobias Brunner
   3  * Copyright (C) 2005-2009 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
  18 /**
  19  * @defgroup peer_cfg peer_cfg
  20  * @{ @ingroup config
  21  */
  22
  23 #ifndef PEER_CFG_H_
  24 #define PEER_CFG_H_
  25
  26 typedef enum cert_policy_t cert_policy_t;
  27 typedef enum unique_policy_t unique_policy_t;
  28 typedef struct peer_cfg_t peer_cfg_t;
  29
  30 #include <library.h>
  31 #include <utils/identification.h>
  32 #include <utils/enumerator.h>
  33 #include <selectors/traffic_selector.h>
  34 #include <config/proposal.h>
  35 #include <config/ike_cfg.h>
  36 #include <config/child_cfg.h>
  37 #include <sa/authenticators/authenticator.h>
  38 #include <sa/authenticators/eap/eap_method.h>
  39 #include <credentials/auth_cfg.h>
  40
  41 /**
  42  * Certificate sending policy. This is also used for certificate
  43  * requests when using this definition for the other peer. If
  44  * it is CERT_NEVER_SEND, a certreq is omitted, otherwise its
  45  * included.
  46  *
  47  * @warning These definitions must be the same as in pluto/starter,
  48  * as they are sent over the stroke socket.
  49  */
  50 enum cert_policy_t {
  51         /** always send certificates, even when not requested */
  52         CERT_ALWAYS_SEND =              0,
  53         /** send certificate upon cert request */
  54         CERT_SEND_IF_ASKED =    1,
  55         /** never send a certificate, even when requested */
  56         CERT_NEVER_SEND =               2,
  57 };
  58
  59 /**
  60  * enum strings for cert_policy_t
  61  */
  62 extern enum_name_t *cert_policy_names;
  63
  64 /**
  65  * Uniqueness of an IKE_SA, used to drop multiple connections with one peer.
  66  */
  67 enum unique_policy_t {
  68         /** do not check for client uniqueness */
  69         UNIQUE_NO,
  70         /** replace unique IKE_SAs if new ones get established */
  71         UNIQUE_REPLACE,
  72         /** keep existing IKE_SAs, close the new ones on connection attept */
  73         UNIQUE_KEEP,
  74 };
  75
  76 /**
  77  * enum strings for unique_policy_t
  78  */
  79 extern enum_name_t *unique_policy_names;
  80
  81 /**
  82  * Configuration of a peer, specified by IDs.
  83  *
  84  * The peer config defines a connection between two given IDs. It contains
  85  * exactly one ike_cfg_t, which is used for initiation. Additionally, it
  86  * contains multiple child_cfg_t defining which CHILD_SAs are allowed for this
  87  * peer.
  88  * @verbatim
  89                           +-------------------+        +---------------+
  90    +---------------+      |     peer_cfg      |      +---------------+ |
  91    |    ike_cfg    |      +-------------------+      |   child_cfg   | |
  92    +---------------+      | - ids             |      +---------------+ |
  93    | - hosts       | 1  1 | - cas             | 1  n | - proposals   | |
  94    | - proposals   |<-----| - auth info       |----->| - traffic sel | |
  95    | - ...         |      | - dpd config      |      | - ...         |-+
  96    +---------------+      | - ...             |      +---------------+
  97                           +-------------------+
  98                              | 1         0 |
  99                              |             |
 100                              v n         n V
 101              +-------------------+     +-------------------+
 102            +-------------------+ |   +-------------------+ |
 103            |     auth_cfg      | |   |     auth_cfg      | |
 104            +-------------------+ |   +-------------------+ |
 105            | - local rules     |-+   | - remote constr.  |-+
 106            +-------------------+     +-------------------+
 107    @endverbatim
 108  *
 109  * Each peer_cfg has two lists of authentication config attached. Local
 110  * authentication configs define how to authenticate ourself against the remote
 111  * peer. Each config is enforced using the multiple authentication extension
 112  * (RFC4739).
 113  * The remote authentication configs are handled as constraints. The peer has
 114  * to fulfill each of these rules (using multiple authentication, in any order)
 115  * to gain access to the configuration.
 116  */
 117 struct peer_cfg_t {
 118
 119         /**
 120          * Get the name of the peer_cfg.
 121          *
 122          * Returned object is not getting cloned.
 123          *
 124          * @return                              peer_cfg's name
 125          */
 126         char* (*get_name) (peer_cfg_t *this);
 127
 128         /**
 129          * Get the IKE version to use for initiating.
 130          *
 131          * @return                              IKE major version
 132          */
 133         u_int (*get_ike_version)(peer_cfg_t *this);
 134
 135         /**
 136          * Get the IKE config to use for initiaton.
 137          *
 138          * @return                              the IKE config to use
 139          */
 140         ike_cfg_t* (*get_ike_cfg) (peer_cfg_t *this);
 141
 142         /**
 143          * Attach a CHILD config.
 144          *
 145          * @param child_cfg             CHILD config to add
 146          */
 147         void (*add_child_cfg) (peer_cfg_t *this, child_cfg_t *child_cfg);
 148
 149         /**
 150          * Detach a CHILD config, pointed to by an enumerator.
 151          *
 152          * @param enumerator    enumerator indicating element position
 153          */
 154         void (*remove_child_cfg)(peer_cfg_t *this, enumerator_t *enumerator);
 155
 156         /**
 157          * Create an enumerator for all attached CHILD configs.
 158          *
 159          * @return                              an enumerator over all CHILD configs.
 160          */
 161         enumerator_t* (*create_child_cfg_enumerator) (peer_cfg_t *this);
 162
 163         /**
 164          * Select a CHILD config from traffic selectors.
 165          *
 166          * @param my_ts                 TS for local side
 167          * @param other_ts              TS for remote side
 168          * @param my_host               host to narrow down dynamic TS for local side
 169          * @param other_host    host to narrow down dynamic TS for remote side
 170          * @return                              selected CHILD config, or NULL if no match found
 171          */
 172         child_cfg_t* (*select_child_cfg) (peer_cfg_t *this, linked_list_t *my_ts,
 173                                                                           linked_list_t *other_ts, host_t *my_host,
 174                                                                           host_t *other_host);
 175
 176         /**
 177          * Add an authentication config to the peer configuration.
 178          *
 179          * @param config                config to add
 180          * @param local                 TRUE for local rules, FALSE for remote constraints
 181          */
 182         void (*add_auth_cfg)(peer_cfg_t *this, auth_cfg_t *cfg, bool local);
 183
 184         /**
 185          * Create an enumerator over registered authentication configs.
 186          *
 187          * @param local                 TRUE for local rules, FALSE for remote constraints
 188          * @return                              enumerator over auth_cfg_t*
 189          */
 190         enumerator_t* (*create_auth_cfg_enumerator)(peer_cfg_t *this, bool local);
 191
 192         /**
 193          * Should be sent a certificate for this connection?
 194          *
 195          * @return                      certificate sending policy
 196          */
 197         cert_policy_t (*get_cert_policy) (peer_cfg_t *this);
 198
 199         /**
 200          * How to handle uniqueness of IKE_SAs?
 201          *
 202          * @return                      unique policy
 203          */
 204         unique_policy_t (*get_unique_policy) (peer_cfg_t *this);
 205
 206         /**
 207          * Get the max number of retries after timeout.
 208          *
 209          * @return                      max number retries
 210          */
 211         u_int32_t (*get_keyingtries) (peer_cfg_t *this);
 212
 213         /**
 214          * Get a time to start rekeying (is randomized with jitter).
 215          *
 216          * @return                      time in s when to start rekeying, 0 disables rekeying
 217          */
 218         u_int32_t (*get_rekey_time)(peer_cfg_t *this);
 219
 220         /**
 221          * Get a time to start reauthentication (is randomized with jitter).
 222          *
 223          * @return                      time in s when to start reauthentication, 0 disables it
 224          */
 225         u_int32_t (*get_reauth_time)(peer_cfg_t *this);
 226
 227         /**
 228          * Get the timeout of a rekeying/reauthenticating SA.
 229          *
 230          * @return                      timeout in s
 231          */
 232         u_int32_t (*get_over_time)(peer_cfg_t *this);
 233
 234         /**
 235          * Use MOBIKE (RFC4555) if peer supports it?
 236          *
 237          * @return                      TRUE to enable MOBIKE support
 238          */
 239         bool (*use_mobike) (peer_cfg_t *this);
 240
 241         /**
 242          * Get the DPD check interval.
 243          *
 244          * @return                      dpd_delay in seconds
 245          */
 246         u_int32_t (*get_dpd) (peer_cfg_t *this);
 247
 248         /**
 249          * Get a virtual IP for the local peer.
 250          *
 251          * If no virtual IP should be used, NULL is returned. %any means to request
 252          * a virtual IP using configuration payloads. A specific address is also
 253          * used for a request and may be changed by the server.
 254          *
 255          * @param suggestion    NULL, %any or specific
 256          * @return                              virtual IP, %any or NULL
 257          */
 258         host_t* (*get_virtual_ip) (peer_cfg_t *this);
 259
 260         /**
 261          * Get the name of the pool to acquire configuration attributes from.
 262          *
 263          * @return                              pool name, NULL if none defined
 264          */
 265         char* (*get_pool)(peer_cfg_t *this);
 266
 267 #ifdef ME
 268         /**
 269          * Is this a mediation connection?
 270          *
 271          * @return                              TRUE, if this is a mediation connection
 272          */
 273         bool (*is_mediation) (peer_cfg_t *this);
 274
 275         /**
 276          * Get peer_cfg of the connection this one is mediated through.
 277          *
 278          * @return                              the peer_cfg of the mediation connection
 279          */
 280         peer_cfg_t* (*get_mediated_by) (peer_cfg_t *this);
 281
 282         /**
 283          * Get the id of the other peer at the mediation server.
 284          *
 285          * This is the leftid of the peer's connection with the mediation server.
 286          *
 287          * If it is not configured, it is assumed to be the same as the right id
 288          * of this connection.
 289          *
 290          * @return                              the id of the other peer
 291          */
 292         identification_t* (*get_peer_id) (peer_cfg_t *this);
 293 #endif /* ME */
 294
 295         /**
 296          * Check if two peer configurations are equal.
 297          *
 298          * This method does not compare associated ike/child_cfg.
 299          *
 300          * @param other                 candidate to check for equality against this
 301          * @return                              TRUE if peer_cfg and ike_cfg are equal
 302          */
 303         bool (*equals)(peer_cfg_t *this, peer_cfg_t *other);
 304
 305         /**
 306          * Increase reference count.
 307          *
 308          * @return                              reference to this
 309          */
 310         peer_cfg_t* (*get_ref) (peer_cfg_t *this);
 311
 312         /**
 313          * Destroys the peer_cfg object.
 314          *
 315          * Decrements the internal reference counter and
 316          * destroys the peer_cfg when it reaches zero.
 317          */
 318         void (*destroy) (peer_cfg_t *this);
 319 };
 320
 321 /**
 322  * Create a configuration object for IKE_AUTH and later.
 323  *
 324  * name-string gets cloned, ID's not.
 325  * Virtual IPs are used if they are != NULL. A %any host means the virtual
 326  * IP should be obtained from the other peer.
 327  * Lifetimes are in seconds. To prevent to peers to start rekeying at the
 328  * same time, a jitter may be specified. Rekeying of an SA starts at
 329  * (rekeylifetime - random(0, jitter)).
 330  *
 331  * @param name                          name of the peer_cfg
 332  * @param ike_version           which IKE version we should use for this peer
 333  * @param ike_cfg                       IKE config to use when acting as initiator
 334  * @param cert_policy           should we send a certificate payload?
 335  * @param unique                        uniqueness of an IKE_SA
 336  * @param keyingtries           how many keying tries should be done before giving up
 337  * @param rekey_time            timeout before starting rekeying
 338  * @param reauth_time           timeout before starting reauthentication
 339  * @param jitter_time           timerange to randomly subtract from rekey/reauth time
 340  * @param over_time                     maximum overtime before closing a rekeying/reauth SA
 341  * @param mobike                        use MOBIKE (RFC4555) if peer supports it
 342  * @param dpd                           DPD check interval, 0 to disable
 343  * @param virtual_ip            virtual IP for local host, or NULL
 344  * @param pool                          pool name to get configuration attributes from, or NULL
 345  * @param mediation                     TRUE if this is a mediation connection
 346  * @param mediated_by           peer_cfg_t of the mediation connection to mediate through
 347  * @param peer_id                       ID that identifies our peer at the mediation server
 348  * @return                                      peer_cfg_t object
 349  */
 350 peer_cfg_t *peer_cfg_create(char *name, u_int ike_version, ike_cfg_t *ike_cfg,
 351                                                         cert_policy_t cert_policy, unique_policy_t unique,
 352                                                         u_int32_t keyingtries, u_int32_t rekey_time,
 353                                                         u_int32_t reauth_time, u_int32_t jitter_time,
 354                                                         u_int32_t over_time, bool mobike, u_int32_t dpd,
 355                                                         host_t *virtual_ip, char *pool,
 356                                                         bool mediation, peer_cfg_t *mediated_by,
 357                                                         identification_t *peer_id);
 358
 359 #endif /** PEER_CFG_H_ @}*/