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         REQUEST *request = handler->request;
  38
  39         RDEBUG2("FAILURE");
  40
  41         tlv_packet[0] = PW_EAP_REQUEST;
  42         tlv_packet[1] = handler->eap_ds->response->id +1;
  43         tlv_packet[2] = 0;
  44         tlv_packet[3] = 11;     /* length of this packet */
  45         tlv_packet[4] = PW_EAP_TLV;
  46         tlv_packet[5] = 0x80;
  47         tlv_packet[6] = EAP_TLV_ACK_RESULT;
  48         tlv_packet[7] = 0;
  49         tlv_packet[8] = 2;      /* length of the data portion */
  50         tlv_packet[9] = 0;
  51         tlv_packet[10] = EAP_TLV_FAILURE;
  52
  53         (tls_session->record_plus)(&tls_session->clean_in, tlv_packet, 11);
  54
  55         /*
  56          *      FIXME: Check the return code.
  57          */
  58         tls_handshake_send(tls_session);
  59
  60         return 1;
  61 }
  62
  63
  64 /*
  65  *      Send protected EAP-Success
  66  *
  67  *       Result-TLV = Success
  68  */
  69 static int eappeap_success(EAP_HANDLER *handler, tls_session_t *tls_session)
  70 {
  71         uint8_t tlv_packet[11];
  72         REQUEST *request = handler->request;
  73
  74         RDEBUG2("SUCCESS");
  75
  76         tlv_packet[0] = PW_EAP_REQUEST;
  77         tlv_packet[1] = handler->eap_ds->response->id +1;
  78         tlv_packet[2] = 0;
  79         tlv_packet[3] = 11;     /* length of this packet */
  80         tlv_packet[4] = PW_EAP_TLV;
  81         tlv_packet[5] = 0x80;   /* mandatory AVP */
  82         tlv_packet[6] = EAP_TLV_ACK_RESULT;
  83         tlv_packet[7] = 0;
  84         tlv_packet[8] = 2;      /* length of the data portion */
  85         tlv_packet[9] = 0;
  86         tlv_packet[10] = EAP_TLV_SUCCESS;
  87
  88         (tls_session->record_plus)(&tls_session->clean_in, tlv_packet, 11);
  89
  90         /*
  91          *      FIXME: Check the return code.
  92          */
  93         tls_handshake_send(tls_session);
  94
  95         return 1;
  96 }
  97
  98
  99 /*
 100  *      Verify the tunneled EAP message.
 101  */
 102 static int eapmessage_verify(REQUEST *request,
 103                              const uint8_t *data, unsigned int data_len)
 104 {
 105         const eap_packet_t *eap_packet = (const eap_packet_t *) data;
 106         uint8_t eap_type;
 107         char buffer[256];
 108
 109         if (!data || (data_len <= 1)) {
 110                 return 0;
 111         }
 112
 113         eap_type = *data;
 114         switch (eap_type) {
 115         case PW_EAP_IDENTITY:
 116                 RDEBUG2("Identity - %*s",
 117                        data_len - 1, data + 1);
 118                 return 1;
 119                 break;
 120
 121                 /*
 122                  *      If the first byte of the packet is
 123                  *      EAP-Response, and the EAP data is a TLV,
 124                  *      then it looks OK...
 125                  */
 126         case PW_EAP_RESPONSE:
 127                 if (eap_packet->data[0] == PW_EAP_TLV) {
 128                         RDEBUG2("Received EAP-TLV response.");
 129                         return 1;
 130                 }
 131                 RDEBUG2("Got something weird.");
 132                 break;
 133
 134
 135                 /*
 136                  *      We normally do Microsoft MS-CHAPv2 (26), versus
 137                  *      Cisco MS-CHAPv2 (29).
 138                  */
 139         case PW_EAP_MSCHAPV2:
 140         default:
 141                 RDEBUG2("EAP type %s",
 142                        eaptype_type2name(eap_type,
 143                                          buffer, sizeof(buffer)));
 144                 return 1;
 145                 break;
 146         }
 147
 148         return 0;
 149 }
 150
 151 /*
 152  *      Convert a pseudo-EAP packet to a list of VALUE_PAIR's.
 153  */
 154 static VALUE_PAIR *eap2vp(REQUEST *request, EAP_DS *eap_ds,
 155                           const uint8_t *data, size_t data_len)
 156 {
 157         size_t total;
 158         VALUE_PAIR *vp = NULL, *head, **tail;
 159
 160         if (data_len > 65535) return NULL; /* paranoia */
 161
 162         vp = paircreate(PW_EAP_MESSAGE, PW_TYPE_OCTETS);
 163         if (!vp) {
 164                 RDEBUG2("Failure in creating VP");
 165                 return NULL;
 166         }
 167
 168         total = data_len;
 169         if (total > 249) total = 249;
 170
 171         /*
 172          *      Hand-build an EAP packet from the crap in PEAP version 0.
 173          */
 174         vp->vp_octets[0] = PW_EAP_RESPONSE;
 175         vp->vp_octets[1] = eap_ds->response->id;
 176         vp->vp_octets[2] = (data_len + EAP_HEADER_LEN) >> 8;
 177         vp->vp_octets[3] = (data_len + EAP_HEADER_LEN) & 0xff;
 178
 179         memcpy(vp->vp_octets + EAP_HEADER_LEN, data, total);
 180         vp->length = EAP_HEADER_LEN + total;
 181
 182         head = vp;
 183         tail = &(vp->next);
 184         while (total < data_len) {
 185                 int vp_len;
 186
 187
 188                 vp = paircreate(PW_EAP_MESSAGE, PW_TYPE_OCTETS);
 189                 if (!vp) {
 190                         RDEBUG2("Failure in creating VP");
 191                         pairfree(&head);
 192                         return NULL;
 193                 }
 194                 vp_len = (data_len - total);
 195                 if (vp_len > 253) vp_len = 253;
 196
 197                 memcpy(vp->vp_octets, data + total, vp_len);
 198                 vp->length = vp_len;
 199
 200                 total += vp_len;
 201                 *tail = vp;
 202                 tail = &(vp->next);
 203         }
 204
 205         return head;
 206 }
 207
 208
 209 /*
 210  *      Convert a list of VALUE_PAIR's to an EAP packet, through the
 211  *      simple expedient of dumping the EAP message
 212  */
 213 static int vp2eap(tls_session_t *tls_session, VALUE_PAIR *vp)
 214 {
 215         /*
 216          *      Skip the id, code, and length.  Just write the EAP
 217          *      type & data to the client.
 218          */
 219 #ifndef NDEBUG
 220         if ((debug_flag > 2) && fr_log_fp) {
 221                 size_t i, total;
 222                 VALUE_PAIR *this;
 223
 224                 total = 0;
 225
 226                 for (this = vp; this != NULL; this = this->next) {
 227                         int start = 0;
 228
 229                         if (this == vp) start = EAP_HEADER_LEN;
 230
 231                         for (i = start; i < vp->length; i++) {
 232                                 if ((total & 0x0f) == 0) fprintf(fr_log_fp, "  PEAP tunnel data out %04x: ", total);
 233
 234                                 fprintf(fr_log_fp, "%02x ", vp->vp_octets[i]);
 235
 236                                 if ((total & 0x0f) == 0x0f) fprintf(fr_log_fp, "\n");
 237                                 total++;
 238                         }
 239                 }
 240                 if ((total & 0x0f) != 0) fprintf(fr_log_fp, "\n");
 241         }
 242 #endif
 243
 244         /*
 245          *      Send the EAP data, WITHOUT the header.
 246          */
 247         (tls_session->record_plus)(&tls_session->clean_in,
 248                                    vp->vp_octets + EAP_HEADER_LEN,
 249                                    vp->length - EAP_HEADER_LEN);
 250
 251         /*
 252          *      Send the rest of the EAP data.
 253          */
 254         for (vp = vp->next; vp != NULL; vp = vp->next) {
 255                 (tls_session->record_plus)(&tls_session->clean_in,
 256                                            vp->vp_octets, vp->length);
 257         }
 258
 259         tls_handshake_send(tls_session);
 260
 261         return 1;
 262 }
 263
 264
 265 /*
 266  *      See if there's a TLV in the response.
 267  */
 268 static int eappeap_check_tlv(REQUEST *request, const uint8_t *data)
 269 {
 270         const eap_packet_t *eap_packet = (const eap_packet_t *) data;
 271
 272         /*
 273          *      Look for success or failure.
 274          */
 275         if ((eap_packet->code == PW_EAP_RESPONSE) &&
 276             (eap_packet->data[0] == PW_EAP_TLV)) {
 277                 if (data[10] == EAP_TLV_SUCCESS) {
 278                         return 1;
 279                 }
 280
 281                 if (data[10] == EAP_TLV_FAILURE) {
 282                         RDEBUG2("Client rejected our response.  The password is probably incorrect.");
 283                         return 0;
 284                 }
 285         }
 286
 287         return 0;
 288 }
 289
 290
 291 /*
 292  *      Use a reply packet to determine what to do.
 293  */
 294 static int process_reply(EAP_HANDLER *handler, tls_session_t *tls_session,
 295                          REQUEST *request, RADIUS_PACKET *reply)
 296 {
 297         int rcode = RLM_MODULE_REJECT;
 298         VALUE_PAIR *vp;
 299         peap_tunnel_t *t = tls_session->opaque;
 300
 301         if ((debug_flag > 0) && fr_log_fp) {
 302                 RDEBUG("Got tunneled reply RADIUS code %d",
 303                        reply->code);
 304
 305                 debug_pair_list(reply->vps);
 306         }
 307
 308         switch (reply->code) {
 309         case PW_AUTHENTICATION_ACK:
 310                 RDEBUG2("Tunneled authentication was successful.");
 311                 t->status = PEAP_STATUS_SENT_TLV_SUCCESS;
 312                 eappeap_success(handler, tls_session);
 313                 rcode = RLM_MODULE_HANDLED;
 314
 315                 /*
 316                  *      If we've been told to use the attributes from
 317                  *      the reply, then do so.
 318                  *
 319                  *      WARNING: This may leak information about the
 320                  *      tunneled user!
 321                  */
 322                 if (t->use_tunneled_reply) {
 323                         RDEBUG2("Saving tunneled attributes for later");
 324
 325                         /*
 326                          *      Clean up the tunneled reply.
 327                          */
 328                         pairdelete(&reply->vps, PW_PROXY_STATE);
 329                         pairdelete(&reply->vps, PW_EAP_MESSAGE);
 330                         pairdelete(&reply->vps, PW_MESSAGE_AUTHENTICATOR);
 331
 332                         t->accept_vps = reply->vps;
 333                         reply->vps = NULL;
 334                 }
 335                 break;
 336
 337         case PW_AUTHENTICATION_REJECT:
 338                 RDEBUG2("Tunneled authentication was rejected.");
 339                 t->status = PEAP_STATUS_SENT_TLV_FAILURE;
 340                 eappeap_failure(handler, tls_session);
 341                 rcode = RLM_MODULE_HANDLED;
 342                 break;
 343
 344         case PW_ACCESS_CHALLENGE:
 345                 RDEBUG2("Got tunneled Access-Challenge");
 346
 347                 /*
 348                  *      Keep the State attribute, if necessary.
 349                  *
 350                  *      Get rid of the old State, too.
 351                  */
 352                 pairfree(&t->state);
 353                 pairmove2(&t->state, &(reply->vps), PW_STATE);
 354
 355                 /*
 356                  *      PEAP takes only EAP-Message attributes inside
 357                  *      of the tunnel.  Any Reply-Message in the
 358                  *      Access-Challenge is ignored.
 359                  */
 360                 vp = NULL;
 361                 pairmove2(&vp, &(reply->vps), PW_EAP_MESSAGE);
 362
 363                 /*
 364                  *      Handle EAP-MSCHAP-V2, where Access-Accept's
 365                  *      from the home server may contain MS-CHAP-Success,
 366                  *      which the module turns into challenges, so that
 367                  *      the client may respond to the challenge with
 368                  *      an "ack" packet.
 369                  */
 370                 if (t->home_access_accept && t->use_tunneled_reply) {
 371                         RDEBUG2("Saving tunneled attributes for later");
 372
 373                         /*
 374                          *      Clean up the tunneled reply.
 375                          */
 376                         pairdelete(&reply->vps, PW_PROXY_STATE);
 377                         pairdelete(&reply->vps, PW_MESSAGE_AUTHENTICATOR);
 378
 379                         t->accept_vps = reply->vps;
 380                         reply->vps = NULL;
 381                 }
 382
 383                 /*
 384                  *      Handle the ACK, by tunneling any necessary reply
 385                  *      VP's back to the client.
 386                  */
 387                 if (vp) {
 388                         vp2eap(tls_session, vp);
 389                         pairfree(&vp);
 390                 }
 391
 392                 rcode = RLM_MODULE_HANDLED;
 393                 break;
 394
 395         default:
 396                 RDEBUG2("Unknown RADIUS packet type %d: rejecting tunneled user", reply->code);
 397                 rcode = RLM_MODULE_REJECT;
 398                 break;
 399         }
 400
 401         return rcode;
 402 }
 403
 404
 405 /*
 406  *      Do post-proxy processing,
 407  */
 408 static int eappeap_postproxy(EAP_HANDLER *handler, void *data)
 409 {
 410         int rcode;
 411         tls_session_t *tls_session = (tls_session_t *) data;
 412         REQUEST *fake, *request = handler->request;
 413
 414         RDEBUG2("Passing reply from proxy back into the tunnel.");
 415
 416         /*
 417          *      If there was a fake request associated with the proxied
 418          *      request, do more processing of it.
 419          */
 420         fake = (REQUEST *) request_data_get(handler->request,
 421                                             handler->request->proxy,
 422                                             REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK);
 423
 424         /*
 425          *      Do the callback, if it exists, and if it was a success.
 426          */
 427         if (fake && (handler->request->proxy_reply->code == PW_AUTHENTICATION_ACK)) {
 428                 REQUEST *request = handler->request;
 429                 peap_tunnel_t *t = tls_session->opaque;
 430
 431                 t->home_access_accept = TRUE;
 432
 433                 /*
 434                  *      Terrible hacks.
 435                  */
 436                 rad_assert(fake->packet == NULL);
 437                 fake->packet = request->proxy;
 438                 fake->packet->src_ipaddr = request->packet->src_ipaddr;
 439                 request->proxy = NULL;
 440
 441                 rad_assert(fake->reply == NULL);
 442                 fake->reply = request->proxy_reply;
 443                 request->proxy_reply = NULL;
 444
 445                 if ((debug_flag > 0) && fr_log_fp) {
 446                         fprintf(fr_log_fp, "server %s {\n", fake->server);
 447                 }
 448
 449                 /*
 450                  *      Perform a post-auth stage, which will get the EAP
 451                  *      handler, too...
 452                  */
 453                 fake->options &= ~RAD_REQUEST_OPTION_PROXY_EAP;
 454                 RDEBUG2("Passing reply back for EAP-MS-CHAP-V2");
 455                 rcode = module_post_proxy(0, fake);
 456
 457                 /*
 458                  *      FIXME: If rcode returns fail, do something
 459                  *      intelligent...
 460                  */
 461                 rcode = rad_postauth(fake);
 462
 463                 if ((debug_flag > 0) && fr_log_fp) {
 464                         fprintf(fr_log_fp, "} # server %s\n", fake->server);
 465
 466                         RDEBUG("Final reply from tunneled session code %d",
 467                                fake->reply->code);
 468
 469                         debug_pair_list(fake->reply->vps);
 470                 }
 471
 472                 /*
 473                  *      Terrible hacks.
 474                  */
 475                 request->proxy = fake->packet;
 476                 fake->packet = NULL;
 477                 request->proxy_reply = fake->reply;
 478                 fake->reply = NULL;
 479
 480                 /*
 481                  *      And we're done with this request.
 482                  */
 483
 484                 switch (rcode) {
 485                 case RLM_MODULE_FAIL:
 486                         request_free(&fake);
 487                         eaptls_fail(handler, 0);
 488                         return 0;
 489                         break;
 490
 491                 default:  /* Don't Do Anything */
 492                         RDEBUG2("Got reply %d", request->proxy_reply->code);
 493                         break;
 494                 }
 495         }
 496         request_free(&fake);    /* robust if fake == NULL */
 497
 498         /*
 499          *      If there was no EAP-Message in the reply packet, then
 500          *      we know that we're supposed to re-run the "authenticate"
 501          *      stage, in order to get the right kind of handling...
 502          */
 503
 504         /*
 505          *      Process the reply from the home server.
 506          */
 507
 508         rcode = process_reply(handler, tls_session, handler->request,
 509                               handler->request->proxy_reply);
 510
 511         /*
 512          *      The proxy code uses the reply from the home server as
 513          *      the basis for the reply to the NAS.  We don't want that,
 514          *      so we toss it, after we've had our way with it.
 515          */
 516         pairfree(&handler->request->proxy_reply->vps);
 517
 518         switch (rcode) {
 519         case RLM_MODULE_REJECT:
 520                 RDEBUG2("Reply was rejected");
 521                 eaptls_fail(handler, 0);
 522                 return 0;
 523
 524         case RLM_MODULE_HANDLED:
 525                 RDEBUG2("Reply was handled");
 526                 eaptls_request(handler->eap_ds, tls_session);
 527                 return 1;
 528
 529         case RLM_MODULE_OK:
 530                 RDEBUG2("Reply was OK");
 531
 532                 /*
 533                  *      Success: Automatically return MPPE keys.
 534                  */
 535                 eaptls_success(handler, 0);
 536                 return 1;
 537
 538         default:
 539                 RDEBUG2("Reply was unknown.");
 540                 break;
 541         }
 542
 543         eaptls_fail(handler, 0);
 544         return 0;
 545 }
 546
 547 /*
 548  *      Free a request.
 549  */
 550 static void my_request_free(void *data)
 551 {
 552         REQUEST *request = (REQUEST *)data;
 553
 554         request_free(&request);
 555 }
 556
 557
 558 /*
 559  *      Process the pseudo-EAP contents of the tunneled data.
 560  */
 561 int eappeap_process(EAP_HANDLER *handler, tls_session_t *tls_session)
 562 {
 563         peap_tunnel_t *t = tls_session->opaque;
 564         REQUEST *fake;
 565         VALUE_PAIR *vp;
 566         int rcode = RLM_MODULE_REJECT;
 567         const uint8_t   *data;
 568         unsigned int data_len;
 569 #ifndef NDEBUG
 570         size_t i;
 571 #endif
 572
 573         REQUEST *request = handler->request;
 574         EAP_DS *eap_ds = handler->eap_ds;
 575
 576         /*
 577          *      Just look at the buffer directly, without doing
 578          *      record_minus.  This lets us avoid another data copy.
 579          */
 580         data_len = tls_session->clean_out.used;
 581         tls_session->clean_out.used = 0;
 582         data = tls_session->clean_out.data;
 583
 584 #ifndef NDEBUG
 585         if ((debug_flag > 2) && fr_log_fp) {
 586                 for (i = 0; i < data_len; i++) {
 587                         if ((i & 0x0f) == 0) fprintf(fr_log_fp, "  PEAP tunnel data in %04x: ", i);
 588
 589                         fprintf(fr_log_fp, "%02x ", data[i]);
 590
 591                         if ((i & 0x0f) == 0x0f) fprintf(fr_log_fp, "\n");
 592                 }
 593                 if ((data_len & 0x0f) != 0) fprintf(fr_log_fp, "\n");
 594         }
 595 #endif
 596
 597         if (!eapmessage_verify(request, data, data_len)) {
 598                 RDEBUG2("Tunneled data is invalid.");
 599                 return RLM_MODULE_REJECT;
 600         }
 601
 602
 603         /*
 604          *      If we authenticated the user, then it's OK.
 605          */
 606         if (t->status == PEAP_STATUS_SENT_TLV_SUCCESS) {
 607                 if (eappeap_check_tlv(request, data)) {
 608                         RDEBUG2("Success");
 609                         return RLM_MODULE_OK;
 610                 }
 611
 612                 return RLM_MODULE_REJECT;
 613
 614         } else if (t->status == PEAP_STATUS_SENT_TLV_FAILURE) {
 615                 RDEBUG2(" Had sent TLV failure.  User was rejected earlier in this session.");
 616                 return RLM_MODULE_REJECT;
 617         }
 618
 619         fake = request_alloc_fake(request);
 620
 621         rad_assert(fake->packet->vps == NULL);
 622
 623         fake->packet->vps = eap2vp(request, eap_ds, data, data_len);
 624         if (!fake->packet->vps) {
 625                 request_free(&fake);
 626                 RDEBUG2("Unable to convert tunneled EAP packet to internal server data structures");
 627                 return PW_AUTHENTICATION_REJECT;
 628         }
 629
 630         if ((debug_flag > 0) && fr_log_fp) {
 631                 RDEBUG("Got tunnled request");
 632
 633                 debug_pair_list(fake->packet->vps);
 634
 635                 fprintf(fr_log_fp, "server %s {\n", fake->server);
 636         }
 637
 638         /*
 639          *      Tell the request that it's a fake one.
 640          */
 641         vp = pairmake("Freeradius-Proxied-To", "127.0.0.1", T_OP_EQ);
 642         if (vp) {
 643                 pairadd(&fake->packet->vps, vp);
 644         }
 645
 646         /*
 647          *      Update other items in the REQUEST data structure.
 648          */
 649         if (!t->username) {
 650                 /*
 651                  *      There's no User-Name in the tunneled session,
 652                  *      so we add one here, by pulling it out of the
 653                  *      EAP-Identity packet.
 654                  */
 655                 if ((data[0] == PW_EAP_IDENTITY) && (data_len > 1)) {
 656                         t->username = pairmake("User-Name", "", T_OP_EQ);
 657                         rad_assert(t->username != NULL);
 658
 659                         memcpy(t->username->vp_strvalue, data + 1, data_len - 1);
 660                         t->username->length = data_len - 1;
 661                         t->username->vp_strvalue[t->username->length] = 0;
 662                         DEBUG2("  PEAP: Got tunneled identity of %s", t->username->vp_strvalue);
 663
 664                         /*
 665                          *      If there's a default EAP type,
 666                          *      set it here.
 667                          */
 668                         if (t->default_eap_type != 0) {
 669                                 DEBUG2("  PEAP: Setting default EAP type for tunneled EAP session.");
 670                                 vp = pairmake("EAP-Type", "0", T_OP_EQ);
 671                                 vp->vp_integer = t->default_eap_type;
 672                                 pairadd(&fake->config_items, vp);
 673                         }
 674                 }
 675         } /* else there WAS a t->username */
 676
 677         if (t->username) {
 678                 vp = paircopy(t->username);
 679                 pairadd(&fake->packet->vps, vp);
 680                 fake->username = pairfind(fake->packet->vps, PW_USER_NAME);
 681                 DEBUG2("  PEAP: Setting User-Name to %s",
 682                        fake->username->vp_strvalue);
 683         }
 684
 685         /*
 686          *      Add the State attribute, too, if it exists.
 687          */
 688         if (t->state) {
 689                 vp = paircopy(t->state);
 690                 if (vp) pairadd(&fake->packet->vps, vp);
 691         }
 692
 693         /*
 694          *      If this is set, we copy SOME of the request attributes
 695          *      from outside of the tunnel to inside of the tunnel.
 696          *
 697          *      We copy ONLY those attributes which do NOT already
 698          *      exist in the tunneled request.
 699          *
 700          *      This code is copied from ../rlm_eap_ttls/ttls.c
 701          */
 702         if (t->copy_request_to_tunnel) {
 703                 VALUE_PAIR *copy;
 704
 705                 for (vp = request->packet->vps; vp != NULL; vp = vp->next) {
 706                         /*
 707                          *      The attribute is a server-side thingy,
 708                          *      don't copy it.
 709                          */
 710                         if ((vp->attribute > 255) &&
 711                             (((vp->attribute >> 16) & 0xffff) == 0)) {
 712                                 continue;
 713                         }
 714
 715                         /*
 716                          *      The outside attribute is already in the
 717                          *      tunnel, don't copy it.
 718                          *
 719                          *      This works for BOTH attributes which
 720                          *      are originally in the tunneled request,
 721                          *      AND attributes which are copied there
 722                          *      from below.
 723                          */
 724                         if (pairfind(fake->packet->vps, vp->attribute)) {
 725                                 continue;
 726                         }
 727
 728                         /*
 729                          *      Some attributes are handled specially.
 730                          */
 731                         switch (vp->attribute) {
 732                                 /*
 733                                  *      NEVER copy Message-Authenticator,
 734                                  *      EAP-Message, or State.  They're
 735                                  *      only for outside of the tunnel.
 736                                  */
 737                         case PW_USER_NAME:
 738                         case PW_USER_PASSWORD:
 739                         case PW_CHAP_PASSWORD:
 740                         case PW_CHAP_CHALLENGE:
 741                         case PW_PROXY_STATE:
 742                         case PW_MESSAGE_AUTHENTICATOR:
 743                         case PW_EAP_MESSAGE:
 744                         case PW_STATE:
 745                                 continue;
 746                                 break;
 747
 748                                 /*
 749                                  *      By default, copy it over.
 750                                  */
 751                         default:
 752                                 break;
 753                         }
 754
 755                         /*
 756                          *      Don't copy from the head, we've already
 757                          *      checked it.
 758                          */
 759                         copy = paircopy2(vp, vp->attribute);
 760                         pairadd(&fake->packet->vps, copy);
 761                 }
 762         }
 763
 764         if ((vp = pairfind(request->config_items, PW_VIRTUAL_SERVER)) != NULL) {
 765                 fake->server = vp->vp_strvalue;
 766
 767         } else if (t->virtual_server) {
 768                 fake->server = t->virtual_server;
 769
 770         } /* else fake->server == request->server */
 771
 772         if ((debug_flag > 0) && fr_log_fp) {
 773                 fprintf(fr_log_fp, "Sending tunneled request\n");
 774
 775                 debug_pair_list(fake->packet->vps);
 776
 777                 fprintf(fr_log_fp, "server %s {\n", fake->server);
 778         }
 779
 780         /*
 781          *      Call authentication recursively, which will
 782          *      do PAP, CHAP, MS-CHAP, etc.
 783          */
 784         rad_authenticate(fake);
 785
 786         /*
 787          *      Note that we don't do *anything* with the reply
 788          *      attributes.
 789          */
 790         if ((debug_flag > 0) && fr_log_fp) {
 791                 fprintf(fr_log_fp, "} # server %s\n", fake->server);
 792
 793                 RDEBUG("Got tunneled reply code %d", fake->reply->code);
 794
 795                 debug_pair_list(fake->reply->vps);
 796         }
 797
 798         /*
 799          *      Decide what to do with the reply.
 800          */
 801         switch (fake->reply->code) {
 802         case 0:                 /* No reply code, must be proxied... */
 803                 vp = pairfind(fake->config_items, PW_PROXY_TO_REALM);
 804
 805                 if (vp) {
 806                         eap_tunnel_data_t *tunnel;
 807
 808                         /*
 809                          *      The tunneled request was NOT handled,
 810                          *      it has to be proxied.  This means that
 811                          *      the "authenticate" stage was never
 812                          *      performed.
 813                          *
 814                          *      If we are told to NOT proxy the
 815                          *      tunneled request as EAP, then this
 816                          *      means that we've got to decode it,
 817                          *      which means that we MUST run the
 818                          *      "authenticate" portion by hand, here.
 819                          *
 820                          *      Once the tunneled EAP session is ALMOST
 821                          *      done, THEN we proxy it...
 822                          */
 823                         if (!t->proxy_tunneled_request_as_eap) {
 824                                 fake->options |= RAD_REQUEST_OPTION_PROXY_EAP;
 825
 826                                 /*
 827                                  *      Hmm... should we check for
 828                                  *      Auth-Type & EAP-Message here?
 829                                  */
 830
 831
 832                                 /*
 833                                  *      Run the EAP authentication.
 834                                  */
 835                                 DEBUG2("  PEAP: Calling authenticate in order to initiate tunneled EAP session.");
 836                                 rcode = module_authenticate(PW_AUTHTYPE_EAP, fake);
 837                                 if (rcode == RLM_MODULE_OK) {
 838                                         /*
 839                                          *      Authentication succeeded! Rah!
 840                                          */
 841                                         fake->reply->code = PW_AUTHENTICATION_ACK;
 842                                         goto do_process;
 843                                 }
 844
 845                                 if (rcode != RLM_MODULE_HANDLED) {
 846                                         DEBUG2("  PEAP: Can't handle the return code %d", rcode);
 847                                         rcode = RLM_MODULE_REJECT;
 848                                         goto done;
 849                                 }
 850
 851                                 /*
 852                                  *      The module decided it wasn't
 853                                  *      done.  Handle it like normal.
 854                                  */
 855                                 if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) == 0) {
 856                                         DEBUG2("    PEAP: Cancelling proxy to realm %s until the tunneled EAP session has been established", vp->vp_strvalue);
 857                                         goto do_process;
 858                                 }
 859
 860                                 /*
 861                                  *      The module has decoded the
 862                                  *      EAP-Message into another set
 863                                  *      of attributes.
 864                                  */
 865                                 pairdelete(&fake->packet->vps,
 866                                            PW_EAP_MESSAGE);
 867                         }
 868
 869                         DEBUG2("  PEAP: Tunneled authentication will be proxied to %s", vp->vp_strvalue);
 870
 871                         /*
 872                          *      Tell the original request that it's going
 873                          *      to be proxied.
 874                          */
 875                         pairmove2(&(request->config_items),
 876                                   &(fake->config_items),
 877                                   PW_PROXY_TO_REALM);
 878
 879                         /*
 880                          *      Seed the proxy packet with the
 881                          *      tunneled request.
 882                          */
 883                         rad_assert(request->proxy == NULL);
 884                         request->proxy = fake->packet;
 885                         fake->packet = NULL;
 886                         rad_free(&fake->reply);
 887                         fake->reply = NULL;
 888
 889                         /*
 890                          *      Set up the callbacks for the tunnel
 891                          */
 892                         tunnel = rad_malloc(sizeof(*tunnel));
 893                         memset(tunnel, 0, sizeof(*tunnel));
 894
 895                         tunnel->tls_session = tls_session;
 896                         tunnel->callback = eappeap_postproxy;
 897
 898                         /*
 899                          *      Associate the callback with the request.
 900                          */
 901                         rcode = request_data_add(request,
 902                                                  request->proxy,
 903                                                  REQUEST_DATA_EAP_TUNNEL_CALLBACK,
 904                                                  tunnel, free);
 905                         rad_assert(rcode == 0);
 906
 907                         /*
 908                          *      We're not proxying it as EAP, so we've got
 909                          *      to do the callback later.
 910                          */
 911                         if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) != 0) {
 912                                 DEBUG2("  PEAP: Remembering to do EAP-MS-CHAP-V2 post-proxy.");
 913
 914                                 /*
 915                                  *      rlm_eap.c has taken care of associating
 916                                  *      the handler with the fake request.
 917                                  *
 918                                  *      So we associate the fake request with
 919                                  *      this request.
 920                                  */
 921                                 rcode = request_data_add(request,
 922                                                          request->proxy,
 923                                                          REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK,
 924                                                          fake, my_request_free);
 925                                 rad_assert(rcode == 0);
 926
 927                                 /*
 928                                  *      Do NOT free the fake request!
 929                                  */
 930                                 return RLM_MODULE_UPDATED;
 931                         }
 932
 933                         /*
 934                          *      Didn't authenticate the packet, but
 935                          *      we're proxying it.
 936                          */
 937                         rcode = RLM_MODULE_UPDATED;
 938
 939                 } else {
 940                         DEBUG2("  PEAP: Unknown RADIUS packet type %d: rejecting tunneled user", fake->reply->code);
 941                         rcode = RLM_MODULE_REJECT;
 942                 }
 943                 break;
 944
 945         default:
 946         do_process:
 947                 rcode = process_reply(handler, tls_session, request,
 948                                       fake->reply);
 949                 break;
 950         }
 951
 952  done:
 953         request_free(&fake);
 954
 955         return rcode;
 956 }