src/libcharon/plugins/eap_peap/eap_peap_peer.c

   1 /*
   2  * Copyright (C) 2011 Andreas Steffen
   3  * Copyright (C) 2011 HSR Hochschule fuer Technik Rapperswil
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2 of the License, or (at your
   8  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * for more details.
  14  */
  15
  16 #include "eap_peap_peer.h"
  17 #include "eap_peap_avp.h"
  18
  19 #include <debug.h>
  20 #include <daemon.h>
  21
  22 typedef struct private_eap_peap_peer_t private_eap_peap_peer_t;
  23
  24 /**
  25  * Private data of an eap_peap_peer_t object.
  26  */
  27 struct private_eap_peap_peer_t {
  28
  29         /**
  30          * Public eap_peap_peer_t interface.
  31          */
  32         eap_peap_peer_t public;
  33
  34         /**
  35          * Server identity
  36          */
  37         identification_t *server;
  38
  39         /**
  40          * Peer identity
  41          */
  42         identification_t *peer;
  43
  44         /**
  45      * Outer phase 1 EAP method
  46          */
  47         eap_method_t *ph1_method;
  48
  49         /**
  50      * Current phase 2 EAP method
  51          */
  52         eap_method_t *ph2_method;
  53
  54         /**
  55      * Pending outbound EAP message
  56          */
  57         eap_payload_t *out;
  58
  59         /**
  60          * AVP handler
  61          */
  62         eap_peap_avp_t *avp;
  63 };
  64
  65 METHOD(tls_application_t, process, status_t,
  66         private_eap_peap_peer_t *this, bio_reader_t *reader)
  67 {
  68         chunk_t data = chunk_empty;
  69         status_t status;
  70         payload_t *payload;
  71         eap_payload_t *in;
  72         eap_code_t code;
  73         eap_type_t type, received_type;
  74         u_int32_t vendor, received_vendor;
  75
  76         status = this->avp->process(this->avp, reader, &data,
  77                                                         this->ph1_method->get_identifier(this->ph1_method));
  78         switch (status)
  79         {
  80                 case SUCCESS:
  81                         break;
  82                 case NEED_MORE:
  83                         return NEED_MORE;
  84                 case FAILED:
  85                 default:
  86                         return FAILED;
  87         }
  88
  89         in = eap_payload_create_data(data);
  90         DBG3(DBG_IKE, "%B", &data);
  91         chunk_free(&data);
  92         payload = (payload_t*)in;
  93
  94         if (payload->verify(payload) != SUCCESS)
  95         {
  96                 in->destroy(in);
  97                 return FAILED;
  98         }
  99
 100         code = in->get_code(in);
 101         if (code == EAP_REQUEST || code == EAP_RESPONSE)
 102         {
 103                 received_type = in->get_type(in, &received_vendor);
 104                 DBG1(DBG_IKE, "received tunneled EAP-PEAP AVP [EAP/%N/%N]",
 105                                                                 eap_code_short_names, code,
 106                                                                 eap_type_short_names, received_type);
 107                 if (code != EAP_REQUEST)
 108                 {
 109                         DBG1(DBG_IKE, "%N expected", eap_code_names, EAP_REQUEST);
 110                         in->destroy(in);
 111                         return FAILED;
 112                 }
 113         }
 114         else
 115         {
 116                 DBG1(DBG_IKE, "received tunneled EAP-PEAP AVP [EAP/%N]",
 117                                                                 eap_code_short_names, code);
 118                 this->out = eap_payload_create_code(code, in->get_identifier(in));
 119                 in->destroy(in);
 120                 return NEED_MORE;
 121         }
 122
 123         /* yet another phase2 authentication? */
 124         if (this->ph2_method)
 125         {
 126                 type = this->ph2_method->get_type(this->ph2_method, &vendor);
 127
 128                 if (type != received_type || vendor != received_vendor)
 129                 {
 130                         this->ph2_method->destroy(this->ph2_method);
 131                         this->ph2_method = NULL;
 132                 }
 133         }
 134
 135         if (this->ph2_method == NULL)
 136         {
 137                 if (received_vendor)
 138                 {
 139                         DBG1(DBG_IKE, "server requested vendor specific EAP method %d-%d "
 140                                                   "(id 0x%02X", received_type, received_vendor,
 141                                                    in->get_identifier(in));
 142                 }
 143                 else
 144                 {
 145                         DBG1(DBG_IKE, "server requested %N authentication (id 0x%02X)",
 146                                  eap_type_names, received_type, in->get_identifier(in));
 147                 }
 148                 this->ph2_method = charon->eap->create_instance(charon->eap,
 149                                                                         received_type, received_vendor,
 150                                                                         EAP_PEER, this->server, this->peer);
 151                 if (!this->ph2_method)
 152                 {
 153                         DBG1(DBG_IKE, "EAP method not supported");
 154                         this->out = eap_payload_create_nak(in->get_identifier(in));
 155                         in->destroy(in);
 156                         return NEED_MORE;
 157                 }
 158                 type = this->ph2_method->get_type(this->ph2_method, &vendor);
 159         }
 160
 161         status = this->ph2_method->process(this->ph2_method, in, &this->out);
 162         in->destroy(in);
 163
 164         switch (status)
 165         {
 166                 case SUCCESS:
 167                         this->ph2_method->destroy(this->ph2_method);
 168                         this->ph2_method = NULL;
 169                         /* fall through to NEED_MORE */
 170                 case NEED_MORE:
 171                         return NEED_MORE;
 172                 case FAILED:
 173                 default:
 174                         if (vendor)
 175                         {
 176                                 DBG1(DBG_IKE, "vendor specific EAP method %d-%d failed",
 177                                                            type, vendor);
 178                         }
 179                         else
 180                         {
 181                                 DBG1(DBG_IKE, "%N method failed", eap_type_names, type);
 182                         }
 183                         return FAILED;
 184         }
 185 }
 186
 187 METHOD(tls_application_t, build, status_t,
 188         private_eap_peap_peer_t *this, bio_writer_t *writer)
 189 {
 190         chunk_t data;
 191         eap_code_t code;
 192         eap_type_t type;
 193         u_int32_t vendor;
 194
 195         if (this->out)
 196         {
 197                 code = this->out->get_code(this->out);
 198                 type = this->out->get_type(this->out, &vendor);
 199                 if (code == EAP_REQUEST || code == EAP_RESPONSE)
 200                 {
 201                         DBG1(DBG_IKE, "sending tunneled EAP-PEAP AVP [EAP/%N/%N]",
 202                                  eap_code_short_names, code, eap_type_short_names, type);
 203                 }
 204                 else
 205                 {
 206                         DBG1(DBG_IKE, "sending tunneled EAP-PEAP AVP [EAP/%N]",
 207                                  eap_code_short_names, code);
 208                 }
 209
 210                 /* get the raw EAP message data */
 211                 data = this->out->get_data(this->out);
 212                 DBG3(DBG_IKE, "%B", &data);
 213                 this->avp->build(this->avp, writer, data);
 214
 215                 this->out->destroy(this->out);
 216                 this->out = NULL;
 217         }
 218         return INVALID_STATE;
 219 }
 220
 221 METHOD(tls_application_t, destroy, void,
 222         private_eap_peap_peer_t *this)
 223 {
 224         this->server->destroy(this->server);
 225         this->peer->destroy(this->peer);
 226         DESTROY_IF(this->ph2_method);
 227         DESTROY_IF(this->out);
 228         this->avp->destroy(this->avp);
 229         free(this);
 230 }
 231
 232 /**
 233  * See header
 234  */
 235 eap_peap_peer_t *eap_peap_peer_create(identification_t *server,
 236                                                                           identification_t *peer,
 237                                                                           eap_method_t *eap_method)
 238 {
 239         private_eap_peap_peer_t *this;
 240
 241         INIT(this,
 242                 .public = {
 243                         .application = {
 244                                 .process = _process,
 245                                 .build = _build,
 246                                 .destroy = _destroy,
 247                         },
 248                 },
 249                 .server = server->clone(server),
 250                 .peer = peer->clone(peer),
 251                 .ph1_method = eap_method,
 252                 .avp = eap_peap_avp_create(FALSE),
 253         );
 254
 255         return &this->public;
 256 }