src/modules/rlm_eap/types/rlm_eap_peap/peap.c

   1 /*
   2  * peap.c contains the interfaces that are called from eap
   3  *
   4  * Version:     $Id$
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  *   Copyright 2003 Alan DeKok <aland@freeradius.org>
  21  *   Copyright 2006 The FreeRADIUS server project
  22  */
  23
  24 #include <freeradius-devel/ident.h>
  25 RCSID("$Id$")
  26
  27 #include "eap_peap.h"
  28
  29 /*
  30  *      Send protected EAP-Failure
  31  *
  32  *       Result-TLV = Failure
  33  */
  34 static int eappeap_failure(EAP_HANDLER *handler, tls_session_t *tls_session)
  35 {
  36         uint8_t tlv_packet[11];
  37
  38         DEBUG2("  rlm_eap_peap: FAILURE");
  39
  40         tlv_packet[0] = PW_EAP_REQUEST;
  41         tlv_packet[1] = handler->eap_ds->response->id +1;
  42         tlv_packet[2] = 0;
  43         tlv_packet[3] = 11;     /* length of this packet */
  44         tlv_packet[4] = PW_EAP_TLV;
  45         tlv_packet[5] = 0x80;
  46         tlv_packet[6] = EAP_TLV_ACK_RESULT;
  47         tlv_packet[7] = 0;
  48         tlv_packet[8] = 2;      /* length of the data portion */
  49         tlv_packet[9] = 0;
  50         tlv_packet[10] = EAP_TLV_FAILURE;
  51
  52         (tls_session->record_plus)(&tls_session->clean_in, tlv_packet, 11);
  53
  54         /*
  55          *      FIXME: Check the return code.
  56          */
  57         tls_handshake_send(tls_session);
  58
  59         return 1;
  60 }
  61
  62
  63 /*
  64  *      Send protected EAP-Success
  65  *
  66  *       Result-TLV = Success
  67  */
  68 static int eappeap_success(EAP_HANDLER *handler, tls_session_t *tls_session)
  69 {
  70         uint8_t tlv_packet[11];
  71
  72         DEBUG2("  rlm_eap_peap: SUCCESS");
  73
  74         tlv_packet[0] = PW_EAP_REQUEST;
  75         tlv_packet[1] = handler->eap_ds->response->id +1;
  76         tlv_packet[2] = 0;
  77         tlv_packet[3] = 11;     /* length of this packet */
  78         tlv_packet[4] = PW_EAP_TLV;
  79         tlv_packet[5] = 0x80;   /* mandatory AVP */
  80         tlv_packet[6] = EAP_TLV_ACK_RESULT;
  81         tlv_packet[7] = 0;
  82         tlv_packet[8] = 2;      /* length of the data portion */
  83         tlv_packet[9] = 0;
  84         tlv_packet[10] = EAP_TLV_SUCCESS;
  85
  86         (tls_session->record_plus)(&tls_session->clean_in, tlv_packet, 11);
  87
  88         /*
  89          *      FIXME: Check the return code.
  90          */
  91         tls_handshake_send(tls_session);
  92
  93         return 1;
  94 }
  95
  96
  97 /*
  98  *      Verify the tunneled EAP message.
  99  */
 100 static int eapmessage_verify(const uint8_t *data, unsigned int data_len)
 101 {
 102         const eap_packet_t *eap_packet = (const eap_packet_t *) data;
 103         uint8_t eap_type;
 104         char buffer[256];
 105
 106         if (!data || (data_len <= 1)) {
 107                 return 0;
 108         }
 109
 110         eap_type = *data;
 111         switch (eap_type) {
 112         case PW_EAP_IDENTITY:
 113                 DEBUG2("  rlm_eap_peap: Identity - %*s",
 114                        data_len - 1, data + 1);
 115                 return 1;
 116                 break;
 117
 118                 /*
 119                  *      If the first byte of the packet is
 120                  *      EAP-Response, and the EAP data is a TLV,
 121                  *      then it looks OK...
 122                  */
 123         case PW_EAP_RESPONSE:
 124                 if (eap_packet->data[0] == PW_EAP_TLV) {
 125                         DEBUG2("  rlm_eap_peap: Received EAP-TLV response.");
 126                         return 1;
 127                 }
 128                 DEBUG2("  rlm_eap_peap: Got something weird.");
 129                 break;
 130
 131
 132                 /*
 133                  *      We normally do Microsoft MS-CHAPv2 (26), versus
 134                  *      Cisco MS-CHAPv2 (29).
 135                  */
 136         case PW_EAP_MSCHAPV2:
 137         default:
 138                 DEBUG2("  rlm_eap_peap: EAP type %s",
 139                        eaptype_type2name(eap_type,
 140                                          buffer, sizeof(buffer)));
 141                 return 1;
 142                 break;
 143         }
 144
 145         return 0;
 146 }
 147
 148 /*
 149  *      Convert a pseudo-EAP packet to a list of VALUE_PAIR's.
 150  */
 151 static VALUE_PAIR *eap2vp(EAP_DS *eap_ds,
 152                           const uint8_t *data, size_t data_len)
 153 {
 154         size_t total;
 155         VALUE_PAIR *vp = NULL, *head, **tail;
 156
 157         if (data_len > 65535) return NULL; /* paranoia */
 158
 159         vp = paircreate(PW_EAP_MESSAGE, PW_TYPE_OCTETS);
 160         if (!vp) {
 161                 DEBUG2("  rlm_eap_peap: Failure in creating VP");
 162                 return NULL;
 163         }
 164
 165         total = data_len;
 166         if (total > 249) total = 249;
 167
 168         /*
 169          *      Hand-build an EAP packet from the crap in PEAP version 0.
 170          */
 171         vp->vp_octets[0] = PW_EAP_RESPONSE;
 172         vp->vp_octets[1] = eap_ds->response->id;
 173         vp->vp_octets[2] = (data_len + EAP_HEADER_LEN) >> 8;
 174         vp->vp_octets[3] = (data_len + EAP_HEADER_LEN) & 0xff;
 175
 176         memcpy(vp->vp_octets + EAP_HEADER_LEN, data, total);
 177         vp->length = EAP_HEADER_LEN + total;
 178
 179         head = vp;
 180         tail = &(vp->next);
 181         while (total < data_len) {
 182                 int vp_len;
 183
 184
 185                 vp = paircreate(PW_EAP_MESSAGE, PW_TYPE_OCTETS);
 186                 if (!vp) {
 187                         DEBUG2("  rlm_eap_peap: Failure in creating VP");
 188                         pairfree(&head);
 189                         return NULL;
 190                 }
 191                 vp_len = (data_len - total);
 192                 if (vp_len > 253) vp_len = 253;
 193
 194                 memcpy(vp->vp_octets, data + total, vp_len);
 195                 vp->length = vp_len;
 196
 197                 total += vp_len;
 198                 *tail = vp;
 199                 tail = &(vp->next);
 200         }
 201
 202         return head;
 203 }
 204
 205
 206 /*
 207  *      Convert a list of VALUE_PAIR's to an EAP packet, through the
 208  *      simple expedient of dumping the EAP message
 209  */
 210 static int vp2eap(tls_session_t *tls_session, VALUE_PAIR *vp)
 211 {
 212         /*
 213          *      Skip the id, code, and length.  Just write the EAP
 214          *      type & data to the client.
 215          */
 216 #ifndef NDEBUG
 217         if ((debug_flag > 2) && fr_log_fp) {
 218                 size_t i, total;
 219                 VALUE_PAIR *this;
 220
 221                 total = 0;
 222
 223                 for (this = vp; this != NULL; this = this->next) {
 224                         int start = 0;
 225
 226                         if (this == vp) start = EAP_HEADER_LEN;
 227
 228                         for (i = start; i < vp->length; i++) {
 229                                 if ((total & 0x0f) == 0) fprintf(fr_log_fp, "  PEAP tunnel data out %04x: ", total);
 230
 231                                 fprintf(fr_log_fp, "%02x ", vp->vp_octets[i]);
 232
 233                                 if ((total & 0x0f) == 0x0f) fprintf(fr_log_fp, "\n");
 234                                 total++;
 235                         }
 236                 }
 237                 if ((total & 0x0f) != 0) fprintf(fr_log_fp, "\n");
 238         }
 239 #endif
 240
 241         /*
 242          *      Send the EAP data, WITHOUT the header.
 243          */
 244         (tls_session->record_plus)(&tls_session->clean_in,
 245                                    vp->vp_octets + EAP_HEADER_LEN,
 246                                    vp->length - EAP_HEADER_LEN);
 247
 248         /*
 249          *      Send the rest of the EAP data.
 250          */
 251         for (vp = vp->next; vp != NULL; vp = vp->next) {
 252                 (tls_session->record_plus)(&tls_session->clean_in,
 253                                            vp->vp_octets, vp->length);
 254         }
 255
 256         tls_handshake_send(tls_session);
 257
 258         return 1;
 259 }
 260
 261
 262 /*
 263  *      See if there's a TLV in the response.
 264  */
 265 static int eappeap_check_tlv(const uint8_t *data)
 266 {
 267         const eap_packet_t *eap_packet = (const eap_packet_t *) data;
 268
 269         /*
 270          *      Look for success or failure.
 271          */
 272         if ((eap_packet->code == PW_EAP_RESPONSE) &&
 273             (eap_packet->data[0] == PW_EAP_TLV)) {
 274                 if (data[10] == EAP_TLV_SUCCESS) {
 275                         return 1;
 276                 }
 277
 278                 if (data[10] == EAP_TLV_FAILURE) {
 279                         DEBUG2("  rlm_eap_peap: Client rejected our response.  The password is probably incorrect.");
 280                         return 0;
 281                 }
 282         }
 283
 284         return 0;
 285 }
 286
 287
 288 /*
 289  *      Use a reply packet to determine what to do.
 290  */
 291 static int process_reply(EAP_HANDLER *handler, tls_session_t *tls_session,
 292                          UNUSED REQUEST *request, RADIUS_PACKET *reply)
 293 {
 294         int rcode = RLM_MODULE_REJECT;
 295         VALUE_PAIR *vp;
 296         peap_tunnel_t *t = tls_session->opaque;
 297
 298         if ((debug_flag > 0) && fr_log_fp) {
 299                 RDEBUG("Got tunneled reply RADIUS code %d",
 300                        reply->code);
 301
 302                 debug_pair_list(reply->vps);
 303         }
 304
 305         switch (reply->code) {
 306         case PW_AUTHENTICATION_ACK:
 307                 DEBUG2("  PEAP: Tunneled authentication was successful.");
 308                 t->status = PEAP_STATUS_SENT_TLV_SUCCESS;
 309                 eappeap_success(handler, tls_session);
 310                 rcode = RLM_MODULE_HANDLED;
 311
 312                 /*
 313                  *      If we've been told to use the attributes from
 314                  *      the reply, then do so.
 315                  *
 316                  *      WARNING: This may leak information about the
 317                  *      tunneled user!
 318                  */
 319                 if (t->use_tunneled_reply) {
 320                         DEBUG2("  Saving tunneled attributes for later");
 321
 322                         /*
 323                          *      Clean up the tunneled reply.
 324                          */
 325                         pairdelete(&reply->vps, PW_PROXY_STATE);
 326                         pairdelete(&reply->vps, PW_EAP_MESSAGE);
 327                         pairdelete(&reply->vps, PW_MESSAGE_AUTHENTICATOR);
 328
 329                         t->accept_vps = reply->vps;
 330                         reply->vps = NULL;
 331                 }
 332                 break;
 333
 334         case PW_AUTHENTICATION_REJECT:
 335                 DEBUG2("  PEAP: Tunneled authentication was rejected.");
 336                 t->status = PEAP_STATUS_SENT_TLV_FAILURE;
 337                 eappeap_failure(handler, tls_session);
 338                 rcode = RLM_MODULE_HANDLED;
 339                 break;
 340
 341         case PW_ACCESS_CHALLENGE:
 342                 DEBUG2("  PEAP: Got tunneled Access-Challenge");
 343
 344                 /*
 345                  *      Keep the State attribute, if necessary.
 346                  *
 347                  *      Get rid of the old State, too.
 348                  */
 349                 pairfree(&t->state);
 350                 pairmove2(&t->state, &(reply->vps), PW_STATE);
 351
 352                 /*
 353                  *      PEAP takes only EAP-Message attributes inside
 354                  *      of the tunnel.  Any Reply-Message in the
 355                  *      Access-Challenge is ignored.
 356                  */
 357                 vp = NULL;
 358                 pairmove2(&vp, &(reply->vps), PW_EAP_MESSAGE);
 359
 360                 /*
 361                  *      Handle EAP-MSCHAP-V2, where Access-Accept's
 362                  *      from the home server may contain MS-CHAP-Success,
 363                  *      which the module turns into challenges, so that
 364                  *      the client may respond to the challenge with
 365                  *      an "ack" packet.
 366                  */
 367                 if (t->home_access_accept && t->use_tunneled_reply) {
 368                         DEBUG2("  Saving tunneled attributes for later");
 369
 370                         /*
 371                          *      Clean up the tunneled reply.
 372                          */
 373                         pairdelete(&reply->vps, PW_PROXY_STATE);
 374                         pairdelete(&reply->vps, PW_MESSAGE_AUTHENTICATOR);
 375
 376                         t->accept_vps = reply->vps;
 377                         reply->vps = NULL;
 378                 }
 379
 380                 /*
 381                  *      Handle the ACK, by tunneling any necessary reply
 382                  *      VP's back to the client.
 383                  */
 384                 if (vp) {
 385                         vp2eap(tls_session, vp);
 386                         pairfree(&vp);
 387                 }
 388
 389                 rcode = RLM_MODULE_HANDLED;
 390                 break;
 391
 392         default:
 393                 DEBUG2("  PEAP: Unknown RADIUS packet type %d: rejecting tunneled user", reply->code);
 394                 rcode = RLM_MODULE_REJECT;
 395                 break;
 396         }
 397
 398         return rcode;
 399 }
 400
 401
 402 /*
 403  *      Do post-proxy processing,
 404  */
 405 static int eappeap_postproxy(EAP_HANDLER *handler, void *data)
 406 {
 407         int rcode;
 408         tls_session_t *tls_session = (tls_session_t *) data;
 409         REQUEST *fake;
 410
 411         DEBUG2("  PEAP: Passing reply from proxy back into the tunnel.");
 412
 413         /*
 414          *      If there was a fake request associated with the proxied
 415          *      request, do more processing of it.
 416          */
 417         fake = (REQUEST *) request_data_get(handler->request,
 418                                             handler->request->proxy,
 419                                             REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK);
 420
 421         /*
 422          *      Do the callback, if it exists, and if it was a success.
 423          */
 424         if (fake && (handler->request->proxy_reply->code == PW_AUTHENTICATION_ACK)) {
 425                 REQUEST *request = handler->request;
 426                 peap_tunnel_t *t = tls_session->opaque;
 427
 428                 t->home_access_accept = TRUE;
 429
 430                 /*
 431                  *      Terrible hacks.
 432                  */
 433                 rad_assert(fake->packet == NULL);
 434                 fake->packet = request->proxy;
 435                 fake->packet->src_ipaddr = request->packet->src_ipaddr;
 436                 request->proxy = NULL;
 437
 438                 rad_assert(fake->reply == NULL);
 439                 fake->reply = request->proxy_reply;
 440                 request->proxy_reply = NULL;
 441
 442                 if ((debug_flag > 0) && fr_log_fp) {
 443                         fprintf(fr_log_fp, "server %s {\n", fake->server);
 444                 }
 445
 446                 /*
 447                  *      Perform a post-auth stage, which will get the EAP
 448                  *      handler, too...
 449                  */
 450                 fake->options &= ~RAD_REQUEST_OPTION_PROXY_EAP;
 451                 DEBUG2("  PEAP: Passing reply back for EAP-MS-CHAP-V2");
 452                 rcode = module_post_proxy(0, fake);
 453
 454                 /*
 455                  *      FIXME: If rcode returns fail, do something
 456                  *      intelligent...
 457                  */
 458                 rcode = rad_postauth(fake);
 459
 460                 if ((debug_flag > 0) && fr_log_fp) {
 461                         fprintf(fr_log_fp, "} # server %s\n", fake->server);
 462
 463                         RDEBUG("Final reply from tunneled session code %d",
 464                                fake->reply->code);
 465
 466                         debug_pair_list(fake->reply->vps);
 467                 }
 468
 469                 /*
 470                  *      Terrible hacks.
 471                  */
 472                 request->proxy = fake->packet;
 473                 fake->packet = NULL;
 474                 request->proxy_reply = fake->reply;
 475                 fake->reply = NULL;
 476
 477                 /*
 478                  *      And we're done with this request.
 479                  */
 480
 481                 switch (rcode) {
 482                 case RLM_MODULE_FAIL:
 483                         request_free(&fake);
 484                         eaptls_fail(handler->eap_ds, 0);
 485                         return 0;
 486                         break;
 487
 488                 default:  /* Don't Do Anything */
 489                         DEBUG2(" PEAP: Got reply %d",
 490                                request->proxy_reply->code);
 491                         break;
 492                 }
 493         }
 494         request_free(&fake);    /* robust if fake == NULL */
 495
 496         /*
 497          *      If there was no EAP-Message in the reply packet, then
 498          *      we know that we're supposed to re-run the "authenticate"
 499          *      stage, in order to get the right kind of handling...
 500          */
 501
 502         /*
 503          *      Process the reply from the home server.
 504          */
 505
 506         rcode = process_reply(handler, tls_session, handler->request,
 507                               handler->request->proxy_reply);
 508
 509         /*
 510          *      The proxy code uses the reply from the home server as
 511          *      the basis for the reply to the NAS.  We don't want that,
 512          *      so we toss it, after we've had our way with it.
 513          */
 514         pairfree(&handler->request->proxy_reply->vps);
 515
 516         switch (rcode) {
 517         case RLM_MODULE_REJECT:
 518                 DEBUG2("  PEAP: Reply was rejected");
 519                 eaptls_fail(handler->eap_ds, 0);
 520                 return 0;
 521
 522         case RLM_MODULE_HANDLED:
 523                 DEBUG2("  PEAP: Reply was handled");
 524                 eaptls_request(handler->eap_ds, tls_session);
 525                 return 1;
 526
 527         case RLM_MODULE_OK:
 528                 DEBUG2("  PEAP: Reply was OK");
 529                 eaptls_success(handler->eap_ds, 0);
 530                 eaptls_gen_mppe_keys(&handler->request->reply->vps,
 531                                      tls_session->ssl,
 532                                      "client EAP encryption");
 533                 return 1;
 534
 535         default:
 536                 DEBUG2("  PEAP: Reply was unknown.");
 537                 break;
 538         }
 539
 540         eaptls_fail(handler->eap_ds, 0);
 541         return 0;
 542 }
 543
 544 /*
 545  *      Free a request.
 546  */
 547 static void my_request_free(void *data)
 548 {
 549         REQUEST *request = (REQUEST *)data;
 550
 551         request_free(&request);
 552 }
 553
 554
 555 /*
 556  *      Process the pseudo-EAP contents of the tunneled data.
 557  */
 558 int eappeap_process(EAP_HANDLER *handler, tls_session_t *tls_session)
 559 {
 560         int err;
 561         peap_tunnel_t *t = tls_session->opaque;
 562         REQUEST *fake;
 563         VALUE_PAIR *vp;
 564         int rcode = RLM_MODULE_REJECT;
 565         const uint8_t   *data;
 566         unsigned int data_len;
 567 #ifndef NDEBUG
 568         size_t i;
 569 #endif
 570
 571         REQUEST *request = handler->request;
 572         EAP_DS *eap_ds = handler->eap_ds;
 573
 574         /*
 575          *      Just look at the buffer directly, without doing
 576          *      record_minus.  This lets us avoid another data copy.
 577          */
 578         data_len = tls_session->clean_out.used;
 579         tls_session->clean_out.used = 0;
 580         data = tls_session->clean_out.data;
 581
 582 #ifndef NDEBUG
 583         if ((debug_flag > 2) && fr_log_fp) {
 584                 for (i = 0; i < data_len; i++) {
 585                         if ((i & 0x0f) == 0) fprintf(fr_log_fp, "  PEAP tunnel data in %04x: ", i);
 586
 587                         fprintf(fr_log_fp, "%02x ", data[i]);
 588
 589                         if ((i & 0x0f) == 0x0f) fprintf(fr_log_fp, "\n");
 590                 }
 591                 if ((data_len & 0x0f) != 0) fprintf(fr_log_fp, "\n");
 592         }
 593 #endif
 594
 595         if (!eapmessage_verify(data, data_len)) {
 596                 DEBUG2("  rlm_eap_peap: Tunneled data is invalid.");
 597                 return RLM_MODULE_REJECT;
 598         }
 599
 600
 601         /*
 602          *      If we authenticated the user, then it's OK.
 603          */
 604         if (t->status == PEAP_STATUS_SENT_TLV_SUCCESS) {
 605                 if (eappeap_check_tlv(data)) {
 606                         DEBUG2("  rlm_eap_peap: Success");
 607                         return RLM_MODULE_OK;
 608                 }
 609
 610                 return RLM_MODULE_REJECT;
 611
 612         } else if (t->status == PEAP_STATUS_SENT_TLV_FAILURE) {
 613                 DEBUG2("  rlm_eap_peap:  Had sent TLV failure.  User was rejected earlier in this session.");
 614                 return RLM_MODULE_REJECT;
 615         }
 616
 617         fake = request_alloc_fake(request);
 618
 619         rad_assert(fake->packet->vps == NULL);
 620
 621         fake->packet->vps = eap2vp(eap_ds, data, data_len);
 622         if (!fake->packet->vps) {
 623                 request_free(&fake);
 624                 DEBUG2("  rlm_eap_peap: Unable to convert tunneled EAP packet to internal server data structures");
 625                 return PW_AUTHENTICATION_REJECT;
 626         }
 627
 628         if ((debug_flag > 0) && fr_log_fp) {
 629                 RDEBUG("Got tunnled request");
 630
 631                 debug_pair_list(fake->packet->vps);
 632
 633                 fprintf(fr_log_fp, "server %s {\n", fake->server);
 634         }
 635
 636         /*
 637          *      Tell the request that it's a fake one.
 638          */
 639         vp = pairmake("Freeradius-Proxied-To", "127.0.0.1", T_OP_EQ);
 640         if (vp) {
 641                 pairadd(&fake->packet->vps, vp);
 642         }
 643
 644         /*
 645          *      Update other items in the REQUEST data structure.
 646          */
 647         if (!t->username) {
 648                 /*
 649                  *      There's no User-Name in the tunneled session,
 650                  *      so we add one here, by pulling it out of the
 651                  *      EAP-Identity packet.
 652                  */
 653                 if ((data[0] == PW_EAP_IDENTITY) && (data_len > 1)) {
 654                         t->username = pairmake("User-Name", "", T_OP_EQ);
 655                         rad_assert(t->username != NULL);
 656
 657                         memcpy(t->username->vp_strvalue, data + 1, data_len - 1);
 658                         t->username->length = data_len - 1;
 659                         t->username->vp_strvalue[t->username->length] = 0;
 660                         DEBUG2("  PEAP: Got tunneled identity of %s", t->username->vp_strvalue);
 661
 662                         /*
 663                          *      If there's a default EAP type,
 664                          *      set it here.
 665                          */
 666                         if (t->default_eap_type != 0) {
 667                                 DEBUG2("  PEAP: Setting default EAP type for tunneled EAP session.");
 668                                 vp = pairmake("EAP-Type", "0", T_OP_EQ);
 669                                 vp->vp_integer = t->default_eap_type;
 670                                 pairadd(&fake->config_items, vp);
 671                         }
 672                 }
 673         } /* else there WAS a t->username */
 674
 675         if (t->username) {
 676                 vp = paircopy(t->username);
 677                 pairadd(&fake->packet->vps, vp);
 678                 fake->username = pairfind(fake->packet->vps, PW_USER_NAME);
 679                 DEBUG2("  PEAP: Setting User-Name to %s",
 680                        fake->username->vp_strvalue);
 681         }
 682
 683         /*
 684          *      Add the State attribute, too, if it exists.
 685          */
 686         if (t->state) {
 687                 vp = paircopy(t->state);
 688                 if (vp) pairadd(&fake->packet->vps, vp);
 689         }
 690
 691         /*
 692          *      If this is set, we copy SOME of the request attributes
 693          *      from outside of the tunnel to inside of the tunnel.
 694          *
 695          *      We copy ONLY those attributes which do NOT already
 696          *      exist in the tunneled request.
 697          *
 698          *      This code is copied from ../rlm_eap_ttls/ttls.c
 699          */
 700         if (t->copy_request_to_tunnel) {
 701                 VALUE_PAIR *copy;
 702
 703                 for (vp = request->packet->vps; vp != NULL; vp = vp->next) {
 704                         /*
 705                          *      The attribute is a server-side thingy,
 706                          *      don't copy it.
 707                          */
 708                         if ((vp->attribute > 255) &&
 709                             (((vp->attribute >> 16) & 0xffff) == 0)) {
 710                                 continue;
 711                         }
 712
 713                         /*
 714                          *      The outside attribute is already in the
 715                          *      tunnel, don't copy it.
 716                          *
 717                          *      This works for BOTH attributes which
 718                          *      are originally in the tunneled request,
 719                          *      AND attributes which are copied there
 720                          *      from below.
 721                          */
 722                         if (pairfind(fake->packet->vps, vp->attribute)) {
 723                                 continue;
 724                         }
 725
 726                         /*
 727                          *      Some attributes are handled specially.
 728                          */
 729                         switch (vp->attribute) {
 730                                 /*
 731                                  *      NEVER copy Message-Authenticator,
 732                                  *      EAP-Message, or State.  They're
 733                                  *      only for outside of the tunnel.
 734                                  */
 735                         case PW_USER_NAME:
 736                         case PW_USER_PASSWORD:
 737                         case PW_CHAP_PASSWORD:
 738                         case PW_CHAP_CHALLENGE:
 739                         case PW_PROXY_STATE:
 740                         case PW_MESSAGE_AUTHENTICATOR:
 741                         case PW_EAP_MESSAGE:
 742                         case PW_STATE:
 743                                 continue;
 744                                 break;
 745
 746                                 /*
 747                                  *      By default, copy it over.
 748                                  */
 749                         default:
 750                                 break;
 751                         }
 752
 753                         /*
 754                          *      Don't copy from the head, we've already
 755                          *      checked it.
 756                          */
 757                         copy = paircopy2(vp, vp->attribute);
 758                         pairadd(&fake->packet->vps, copy);
 759                 }
 760         }
 761
 762         if ((vp = pairfind(request->config_items, PW_VIRTUAL_SERVER)) != NULL) {
 763                 fake->server = vp->vp_strvalue;
 764
 765         } else if (t->virtual_server) {
 766                 fake->server = t->virtual_server;
 767
 768         } /* else fake->server == request->server */
 769
 770         if ((debug_flag > 0) && fr_log_fp) {
 771                 fprintf(fr_log_fp, "Sending tunneled request\n");
 772
 773                 debug_pair_list(fake->packet->vps);
 774
 775                 fprintf(fr_log_fp, "server %s {\n", fake->server);
 776         }
 777
 778         /*
 779          *      Call authentication recursively, which will
 780          *      do PAP, CHAP, MS-CHAP, etc.
 781          */
 782         rad_authenticate(fake);
 783
 784         /*
 785          *      Note that we don't do *anything* with the reply
 786          *      attributes.
 787          */
 788         if ((debug_flag > 0) && fr_log_fp) {
 789                 fprintf(fr_log_fp, "} # server %s\n", fake->server);
 790
 791                 RDEBUG("Got tunneled reply code %d", fake->reply->code);
 792
 793                 debug_pair_list(fake->reply->vps);
 794         }
 795
 796         /*
 797          *      Decide what to do with the reply.
 798          */
 799         switch (fake->reply->code) {
 800         case 0:                 /* No reply code, must be proxied... */
 801                 vp = pairfind(fake->config_items, PW_PROXY_TO_REALM);
 802
 803                 if (vp) {
 804                         eap_tunnel_data_t *tunnel;
 805
 806                         /*
 807                          *      The tunneled request was NOT handled,
 808                          *      it has to be proxied.  This means that
 809                          *      the "authenticate" stage was never
 810                          *      performed.
 811                          *
 812                          *      If we are told to NOT proxy the
 813                          *      tunneled request as EAP, then this
 814                          *      means that we've got to decode it,
 815                          *      which means that we MUST run the
 816                          *      "authenticate" portion by hand, here.
 817                          *
 818                          *      Once the tunneled EAP session is ALMOST
 819                          *      done, THEN we proxy it...
 820                          */
 821                         if (!t->proxy_tunneled_request_as_eap) {
 822                                 fake->options |= RAD_REQUEST_OPTION_PROXY_EAP;
 823
 824                                 /*
 825                                  *      Hmm... should we check for
 826                                  *      Auth-Type & EAP-Message here?
 827                                  */
 828
 829
 830                                 /*
 831                                  *      Run the EAP authentication.
 832                                  */
 833                                 DEBUG2("  PEAP: Calling authenticate in order to initiate tunneled EAP session.");
 834                                 rcode = module_authenticate(PW_AUTHTYPE_EAP, fake);
 835                                 if (rcode == RLM_MODULE_OK) {
 836                                         /*
 837                                          *      Authentication succeeded! Rah!
 838                                          */
 839                                         fake->reply->code = PW_AUTHENTICATION_ACK;
 840                                         goto do_process;
 841                                 }
 842
 843                                 if (rcode != RLM_MODULE_HANDLED) {
 844                                         DEBUG2("  PEAP: Can't handle the return code %d", rcode);
 845                                         rcode = RLM_MODULE_REJECT;
 846                                         goto done;
 847                                 }
 848
 849                                 /*
 850                                  *      The module decided it wasn't
 851                                  *      done.  Handle it like normal.
 852                                  */
 853                                 if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) == 0) {
 854                                         DEBUG2("    PEAP: Cancelling proxy to realm %s until the tunneled EAP session has been established", vp->vp_strvalue);
 855                                         goto do_process;
 856                                 }
 857
 858                                 /*
 859                                  *      The module has decoded the
 860                                  *      EAP-Message into another set
 861                                  *      of attributes.
 862                                  */
 863                                 pairdelete(&fake->packet->vps,
 864                                            PW_EAP_MESSAGE);
 865                         }
 866
 867                         DEBUG2("  PEAP: Tunneled authentication will be proxied to %s", vp->vp_strvalue);
 868
 869                         /*
 870                          *      Tell the original request that it's going
 871                          *      to be proxied.
 872                          */
 873                         pairmove2(&(request->config_items),
 874                                   &(fake->config_items),
 875                                   PW_PROXY_TO_REALM);
 876
 877                         /*
 878                          *      Seed the proxy packet with the
 879                          *      tunneled request.
 880                          */
 881                         rad_assert(request->proxy == NULL);
 882                         request->proxy = fake->packet;
 883                         fake->packet = NULL;
 884                         rad_free(&fake->reply);
 885                         fake->reply = NULL;
 886
 887                         /*
 888                          *      Set up the callbacks for the tunnel
 889                          */
 890                         tunnel = rad_malloc(sizeof(*tunnel));
 891                         memset(tunnel, 0, sizeof(*tunnel));
 892
 893                         tunnel->tls_session = tls_session;
 894                         tunnel->callback = eappeap_postproxy;
 895
 896                         /*
 897                          *      Associate the callback with the request.
 898                          */
 899                         rcode = request_data_add(request,
 900                                                  request->proxy,
 901                                                  REQUEST_DATA_EAP_TUNNEL_CALLBACK,
 902                                                  tunnel, free);
 903                         rad_assert(rcode == 0);
 904
 905                         /*
 906                          *      We're not proxying it as EAP, so we've got
 907                          *      to do the callback later.
 908                          */
 909                         if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) != 0) {
 910                                 DEBUG2("  PEAP: Remembering to do EAP-MS-CHAP-V2 post-proxy.");
 911
 912                                 /*
 913                                  *      rlm_eap.c has taken care of associating
 914                                  *      the handler with the fake request.
 915                                  *
 916                                  *      So we associate the fake request with
 917                                  *      this request.
 918                                  */
 919                                 rcode = request_data_add(request,
 920                                                          request->proxy,
 921                                                          REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK,
 922                                                          fake, my_request_free);
 923                                 rad_assert(rcode == 0);
 924
 925                                 /*
 926                                  *      Do NOT free the fake request!
 927                                  */
 928                                 return RLM_MODULE_UPDATED;
 929                         }
 930
 931                         /*
 932                          *      Didn't authenticate the packet, but
 933                          *      we're proxying it.
 934                          */
 935                         rcode = RLM_MODULE_UPDATED;
 936
 937                 } else {
 938                         DEBUG2("  PEAP: Unknown RADIUS packet type %d: rejecting tunneled user", fake->reply->code);
 939                         rcode = RLM_MODULE_REJECT;
 940                 }
 941                 break;
 942
 943         default:
 944         do_process:
 945                 rcode = process_reply(handler, tls_session, request,
 946                                       fake->reply);
 947                 break;
 948         }
 949
 950  done:
 951         request_free(&fake);
 952
 953         return rcode;
 954 }