src/charon/sa/tasks/ike_cert_post.c

   1 /*
   2  * Copyright (C) 2008 Tobias Brunner
   3  * Copyright (C) 2006-2009 Martin Willi
   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
  17 #include "ike_cert_post.h"
  18
  19 #include <daemon.h>
  20 #include <sa/ike_sa.h>
  21 #include <encoding/payloads/cert_payload.h>
  22 #include <encoding/payloads/certreq_payload.h>
  23 #include <encoding/payloads/auth_payload.h>
  24 #include <credentials/certificates/x509.h>
  25
  26
  27 typedef struct private_ike_cert_post_t private_ike_cert_post_t;
  28
  29 /**
  30  * Private members of a ike_cert_post_t task.
  31  */
  32 struct private_ike_cert_post_t {
  33
  34         /**
  35          * Public methods and task_t interface.
  36          */
  37         ike_cert_post_t public;
  38
  39         /**
  40          * Assigned IKE_SA.
  41          */
  42         ike_sa_t *ike_sa;
  43
  44         /**
  45          * Are we the initiator?
  46          */
  47         bool initiator;
  48 };
  49
  50 /**
  51  * Generates the cert payload, if possible with "Hash and URL"
  52  */
  53 static cert_payload_t *build_cert_payload(private_ike_cert_post_t *this, certificate_t *cert)
  54 {
  55         cert_payload_t *payload = NULL;
  56
  57         if (this->ike_sa->supports_extension(this->ike_sa, EXT_HASH_AND_URL))
  58         {
  59                 /* ok, our peer sent us a HTTP_CERT_LOOKUP_SUPPORTED Notify */
  60                 hasher_t *hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
  61                 if (hasher != NULL)
  62                 {
  63                         chunk_t hash, encoded = cert->get_encoding(cert);
  64                         enumerator_t *enumerator;
  65                         char *url;
  66
  67                         hasher->allocate_hash(hasher, encoded, &hash);
  68                         identification_t *id = identification_create_from_encoding(ID_CERT_DER_SHA1, hash);
  69
  70                         enumerator = charon->credentials->create_cdp_enumerator(charon->credentials, CERT_X509, id);
  71                         if (enumerator->enumerate(enumerator, &url))
  72                         {
  73                                 /* if we have an URL available we send that to our peer */
  74                                 payload = cert_payload_create_from_hash_and_url(hash, url);
  75                         }
  76                         enumerator->destroy(enumerator);
  77
  78                         id->destroy(id);
  79                         chunk_free(&hash);
  80                         chunk_free(&encoded);
  81                         hasher->destroy(hasher);
  82                 }
  83                 else
  84                 {
  85                         DBG1(DBG_IKE, "unable to use hash-and-url: sha1 not supported");
  86                 }
  87         }
  88
  89         if (!payload)
  90         {
  91                 /* our peer does not support "Hash and URL" or we do not have an URL
  92                  * to send to our peer, just create a normal cert payload */
  93                 payload = cert_payload_create_from_cert(cert);
  94         }
  95
  96         return payload;
  97 }
  98
  99 /**
 100  * add certificates to message
 101  */
 102 static void build_certs(private_ike_cert_post_t *this, message_t *message)
 103 {
 104         peer_cfg_t *peer_cfg;
 105         auth_payload_t *payload;
 106
 107         payload = (auth_payload_t*)message->get_payload(message, AUTHENTICATION);
 108         peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
 109         if (!peer_cfg || !payload || payload->get_auth_method(payload) == AUTH_PSK)
 110         {       /* no CERT payload for EAP/PSK */
 111                 return;
 112         }
 113
 114         switch (peer_cfg->get_cert_policy(peer_cfg))
 115         {
 116                 case CERT_NEVER_SEND:
 117                         break;
 118                 case CERT_SEND_IF_ASKED:
 119                         if (!this->ike_sa->has_condition(this->ike_sa, COND_CERTREQ_SEEN))
 120                         {
 121                                 break;
 122                         }
 123                         /* FALL */
 124                 case CERT_ALWAYS_SEND:
 125                 {
 126                         cert_payload_t *payload;
 127                         enumerator_t *enumerator;
 128                         certificate_t *cert;
 129                         auth_rule_t type;
 130                         auth_cfg_t *auth;
 131
 132                         auth = this->ike_sa->get_auth_cfg(this->ike_sa, TRUE);
 133
 134                         /* get subject cert first, then issuing certificates */
 135                         cert = auth->get(auth, AUTH_RULE_SUBJECT_CERT);
 136                         if (!cert)
 137                         {
 138                                 break;
 139                         }
 140                         payload = build_cert_payload(this, cert);
 141                         if (!payload)
 142                         {
 143                                 break;
 144                         }
 145                         DBG1(DBG_IKE, "sending end entity cert \"%Y\"",
 146                                  cert->get_subject(cert));
 147                         message->add_payload(message, (payload_t*)payload);
 148
 149                         enumerator = auth->create_enumerator(auth);
 150                         while (enumerator->enumerate(enumerator, &type, &cert))
 151                         {
 152                                 if (type == AUTH_RULE_IM_CERT)
 153                                 {
 154                                         payload = cert_payload_create_from_cert(cert);
 155                                         if (payload)
 156                                         {
 157                                                 DBG1(DBG_IKE, "sending issuer cert \"%Y\"",
 158                                                          cert->get_subject(cert));
 159                                                 message->add_payload(message, (payload_t*)payload);
 160                                         }
 161                                 }
 162                         }
 163                         enumerator->destroy(enumerator);
 164                 }
 165         }
 166 }
 167
 168 /**
 169  * Implementation of task_t.process for initiator
 170  */
 171 static status_t build_i(private_ike_cert_post_t *this, message_t *message)
 172 {
 173         build_certs(this, message);
 174
 175         return NEED_MORE;
 176 }
 177
 178 /**
 179  * Implementation of task_t.process for responder
 180  */
 181 static status_t process_r(private_ike_cert_post_t *this, message_t *message)
 182 {
 183         return NEED_MORE;
 184 }
 185
 186 /**
 187  * Implementation of task_t.build for responder
 188  */
 189 static status_t build_r(private_ike_cert_post_t *this, message_t *message)
 190 {
 191         build_certs(this, message);
 192
 193         if (this->ike_sa->get_state(this->ike_sa) != IKE_ESTABLISHED)
 194         {       /* stay alive, we might have additional rounds with certs */
 195                 return NEED_MORE;
 196         }
 197         return SUCCESS;
 198 }
 199
 200 /**
 201  * Implementation of task_t.process for initiator
 202  */
 203 static status_t process_i(private_ike_cert_post_t *this, message_t *message)
 204 {
 205         if (this->ike_sa->get_state(this->ike_sa) != IKE_ESTABLISHED)
 206         {       /* stay alive, we might have additional rounds with CERTS */
 207                 return NEED_MORE;
 208         }
 209         return SUCCESS;
 210 }
 211
 212 /**
 213  * Implementation of task_t.get_type
 214  */
 215 static task_type_t get_type(private_ike_cert_post_t *this)
 216 {
 217         return IKE_CERT_POST;
 218 }
 219
 220 /**
 221  * Implementation of task_t.migrate
 222  */
 223 static void migrate(private_ike_cert_post_t *this, ike_sa_t *ike_sa)
 224 {
 225         this->ike_sa = ike_sa;
 226 }
 227
 228 /**
 229  * Implementation of task_t.destroy
 230  */
 231 static void destroy(private_ike_cert_post_t *this)
 232 {
 233         free(this);
 234 }
 235
 236 /*
 237  * Described in header.
 238  */
 239 ike_cert_post_t *ike_cert_post_create(ike_sa_t *ike_sa, bool initiator)
 240 {
 241         private_ike_cert_post_t *this = malloc_thing(private_ike_cert_post_t);
 242
 243         this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
 244         this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
 245         this->public.task.destroy = (void(*)(task_t*))destroy;
 246
 247         if (initiator)
 248         {
 249                 this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
 250                 this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
 251         }
 252         else
 253         {
 254                 this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
 255                 this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
 256         }
 257
 258         this->ike_sa = ike_sa;
 259         this->initiator = initiator;
 260
 261         return &this->public;
 262 }
 263