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 static int eappeap_identity(EAP_HANDLER *handler, tls_session_t *tls_session)
 100 {
 101         eap_packet_t eap_packet;
 102
 103         eap_packet.code = PW_EAP_REQUEST;
 104         eap_packet.id = handler->eap_ds->response->id + 1;
 105         eap_packet.length[0] = 0;
 106         eap_packet.length[1] = EAP_HEADER_LEN + 1;
 107         eap_packet.data[0] = PW_EAP_IDENTITY;
 108
 109         (tls_session->record_plus)(&tls_session->clean_in,
 110                                   &eap_packet, sizeof(eap_packet));
 111
 112         tls_handshake_send(tls_session);
 113         (tls_session->record_init)(&tls_session->clean_in);
 114
 115         return 1;
 116 }
 117
 118
 119 /*
 120  *      Verify the tunneled EAP message.
 121  */
 122 static int eapmessage_verify(REQUEST *request,
 123                              const uint8_t *data, unsigned int data_len)
 124 {
 125         const eap_packet_t *eap_packet = (const eap_packet_t *) data;
 126         uint8_t eap_type;
 127         char buffer[256];
 128
 129         /*
 130          *      No data, OR only 1 byte of EAP type.
 131          */
 132         if (!data || (data_len == 0) ||
 133             ((data_len <= 1) && (data[0] != PW_EAP_IDENTITY))) {
 134                 return 0;
 135         }
 136
 137         eap_type = *data;
 138         switch (eap_type) {
 139         case PW_EAP_IDENTITY:
 140                 if (data_len == 1) {
 141                         RDEBUG2("Identity - ");
 142                         return 1;
 143                 }
 144                 RDEBUG2("Identity - %*s",
 145                        data_len - 1, data + 1);
 146                 return 1;
 147                 break;
 148
 149                 /*
 150                  *      If the first byte of the packet is
 151                  *      EAP-Response, and the EAP data is a TLV,
 152                  *      then it looks OK...
 153                  */
 154         case PW_EAP_RESPONSE:
 155                 if (eap_packet->data[0] == PW_EAP_TLV) {
 156                         RDEBUG2("Received EAP-TLV response.");
 157                         return 1;
 158                 }
 159                 RDEBUG2("Got something weird.");
 160                 break;
 161
 162
 163                 /*
 164                  *      We normally do Microsoft MS-CHAPv2 (26), versus
 165                  *      Cisco MS-CHAPv2 (29).
 166                  */
 167         case PW_EAP_MSCHAPV2:
 168         default:
 169                 RDEBUG2("EAP type %s",
 170                        eaptype_type2name(eap_type,
 171                                          buffer, sizeof(buffer)));
 172                 return 1;
 173                 break;
 174         }
 175
 176         return 0;
 177 }
 178
 179 /*
 180  *      Convert a pseudo-EAP packet to a list of VALUE_PAIR's.
 181  */
 182 static VALUE_PAIR *eap2vp(REQUEST *request, EAP_DS *eap_ds,
 183                           const uint8_t *data, size_t data_len)
 184 {
 185         size_t total;
 186         VALUE_PAIR *vp = NULL, *head, **tail;
 187
 188         if (data_len > 65535) return NULL; /* paranoia */
 189
 190         vp = paircreate(PW_EAP_MESSAGE, 0, PW_TYPE_OCTETS);
 191         if (!vp) {
 192                 RDEBUG2("Failure in creating VP");
 193                 return NULL;
 194         }
 195
 196         total = data_len;
 197         if (total > 249) total = 249;
 198
 199         /*
 200          *      Hand-build an EAP packet from the crap in PEAP version 0.
 201          */
 202         vp->vp_octets[0] = PW_EAP_RESPONSE;
 203         vp->vp_octets[1] = eap_ds->response->id;
 204         vp->vp_octets[2] = (data_len + EAP_HEADER_LEN) >> 8;
 205         vp->vp_octets[3] = (data_len + EAP_HEADER_LEN) & 0xff;
 206
 207         memcpy(vp->vp_octets + EAP_HEADER_LEN, data, total);
 208         vp->length = EAP_HEADER_LEN + total;
 209
 210         head = vp;
 211         tail = &(vp->next);
 212         while (total < data_len) {
 213                 int vp_len;
 214
 215
 216                 vp = paircreate(PW_EAP_MESSAGE, 0, PW_TYPE_OCTETS);
 217                 if (!vp) {
 218                         RDEBUG2("Failure in creating VP");
 219                         pairfree(&head);
 220                         return NULL;
 221                 }
 222                 vp_len = (data_len - total);
 223                 if (vp_len > 253) vp_len = 253;
 224
 225                 memcpy(vp->vp_octets, data + total, vp_len);
 226                 vp->length = vp_len;
 227
 228                 total += vp_len;
 229                 *tail = vp;
 230                 tail = &(vp->next);
 231         }
 232
 233         return head;
 234 }
 235
 236
 237 /*
 238  *      Convert a list of VALUE_PAIR's to an EAP packet, through the
 239  *      simple expedient of dumping the EAP message
 240  */
 241 static int vp2eap(tls_session_t *tls_session, VALUE_PAIR *vp)
 242 {
 243         /*
 244          *      Skip the id, code, and length.  Just write the EAP
 245          *      type & data to the client.
 246          */
 247 #ifndef NDEBUG
 248         if ((debug_flag > 2) && fr_log_fp) {
 249                 size_t i, total;
 250                 VALUE_PAIR *this;
 251
 252                 total = 0;
 253
 254                 for (this = vp; this != NULL; this = this->next) {
 255                         int start = 0;
 256
 257                         if (this == vp) start = EAP_HEADER_LEN;
 258
 259                         for (i = start; i < vp->length; i++) {
 260                           if ((total & 0x0f) == 0) fprintf(fr_log_fp, "  PEAP tunnel data out %04x: ", (int) total);
 261
 262                                 fprintf(fr_log_fp, "%02x ", vp->vp_octets[i]);
 263
 264                                 if ((total & 0x0f) == 0x0f) fprintf(fr_log_fp, "\n");
 265                                 total++;
 266                         }
 267                 }
 268                 if ((total & 0x0f) != 0) fprintf(fr_log_fp, "\n");
 269         }
 270 #endif
 271
 272         /*
 273          *      Send the EAP data, WITHOUT the header.
 274          */
 275         (tls_session->record_plus)(&tls_session->clean_in,
 276                                    vp->vp_octets + EAP_HEADER_LEN,
 277                                    vp->length - EAP_HEADER_LEN);
 278
 279         /*
 280          *      Send the rest of the EAP data.
 281          */
 282         for (vp = vp->next; vp != NULL; vp = vp->next) {
 283                 (tls_session->record_plus)(&tls_session->clean_in,
 284                                            vp->vp_octets, vp->length);
 285         }
 286
 287         tls_handshake_send(tls_session);
 288
 289         return 1;
 290 }
 291
 292
 293 /*
 294  *      See if there's a TLV in the response.
 295  */
 296 static int eappeap_check_tlv(REQUEST *request, const uint8_t *data)
 297 {
 298         const eap_packet_t *eap_packet = (const eap_packet_t *) data;
 299
 300         /*
 301          *      Look for success or failure.
 302          */
 303         if ((eap_packet->code == PW_EAP_RESPONSE) &&
 304             (eap_packet->data[0] == PW_EAP_TLV)) {
 305                 if (data[10] == EAP_TLV_SUCCESS) {
 306                         return 1;
 307                 }
 308
 309                 if (data[10] == EAP_TLV_FAILURE) {
 310                         RDEBUG2("Client rejected our response.  The password is probably incorrect.");
 311                         return 0;
 312                 }
 313         }
 314
 315         return 0;
 316 }
 317
 318
 319 /*
 320  *      Use a reply packet to determine what to do.
 321  */
 322 static int process_reply(EAP_HANDLER *handler, tls_session_t *tls_session,
 323                          REQUEST *request, RADIUS_PACKET *reply)
 324 {
 325         int rcode = RLM_MODULE_REJECT;
 326         VALUE_PAIR *vp;
 327         peap_tunnel_t *t = tls_session->opaque;
 328
 329         if ((debug_flag > 0) && fr_log_fp) {
 330                 RDEBUG("Got tunneled reply RADIUS code %d",
 331                        reply->code);
 332
 333                 debug_pair_list(reply->vps);
 334         }
 335
 336         switch (reply->code) {
 337         case PW_AUTHENTICATION_ACK:
 338                 RDEBUG2("Tunneled authentication was successful.");
 339                 t->status = PEAP_STATUS_SENT_TLV_SUCCESS;
 340                 eappeap_success(handler, tls_session);
 341                 rcode = RLM_MODULE_HANDLED;
 342
 343                 /*
 344                  *      If we've been told to use the attributes from
 345                  *      the reply, then do so.
 346                  *
 347                  *      WARNING: This may leak information about the
 348                  *      tunneled user!
 349                  */
 350                 if (t->use_tunneled_reply) {
 351                         RDEBUG2("Saving tunneled attributes for later");
 352
 353                         /*
 354                          *      Clean up the tunneled reply.
 355                          */
 356                         pairdelete(&reply->vps, PW_PROXY_STATE, 0);
 357                         pairdelete(&reply->vps, PW_EAP_MESSAGE, 0);
 358                         pairdelete(&reply->vps, PW_MESSAGE_AUTHENTICATOR, 0);
 359
 360                         /*
 361                          *      Delete MPPE keys & encryption policy.  We don't
 362                          *      want these here.
 363                          */
 364                         pairdelete(&reply->vps, 7, VENDORPEC_MICROSOFT);
 365                         pairdelete(&reply->vps, 8, VENDORPEC_MICROSOFT);
 366                         pairdelete(&reply->vps, 16, VENDORPEC_MICROSOFT);
 367                         pairdelete(&reply->vps, 17, VENDORPEC_MICROSOFT);
 368
 369                         t->accept_vps = reply->vps;
 370                         reply->vps = NULL;
 371                 }
 372                 break;
 373
 374         case PW_AUTHENTICATION_REJECT:
 375                 RDEBUG2("Tunneled authentication was rejected.");
 376                 t->status = PEAP_STATUS_SENT_TLV_FAILURE;
 377                 eappeap_failure(handler, tls_session);
 378                 rcode = RLM_MODULE_HANDLED;
 379                 break;
 380
 381         case PW_ACCESS_CHALLENGE:
 382                 RDEBUG2("Got tunneled Access-Challenge");
 383
 384                 /*
 385                  *      Keep the State attribute, if necessary.
 386                  *
 387                  *      Get rid of the old State, too.
 388                  */
 389                 pairfree(&t->state);
 390                 pairmove2(&t->state, &(reply->vps), PW_STATE, 0);
 391
 392                 /*
 393                  *      PEAP takes only EAP-Message attributes inside
 394                  *      of the tunnel.  Any Reply-Message in the
 395                  *      Access-Challenge is ignored.
 396                  */
 397                 vp = NULL;
 398                 pairmove2(&vp, &(reply->vps), PW_EAP_MESSAGE, 0);
 399
 400                 /*
 401                  *      Handle EAP-MSCHAP-V2, where Access-Accept's
 402                  *      from the home server may contain MS-CHAP-Success,
 403                  *      which the module turns into challenges, so that
 404                  *      the client may respond to the challenge with
 405                  *      an "ack" packet.
 406                  */
 407                 if (t->home_access_accept && t->use_tunneled_reply) {
 408                         RDEBUG2("Saving tunneled attributes for later");
 409
 410                         /*
 411                          *      Clean up the tunneled reply.
 412                          */
 413                         pairdelete(&reply->vps, PW_PROXY_STATE, 0);
 414                         pairdelete(&reply->vps, PW_MESSAGE_AUTHENTICATOR, 0);
 415
 416                         t->accept_vps = reply->vps;
 417                         reply->vps = NULL;
 418                 }
 419
 420                 /*
 421                  *      Handle the ACK, by tunneling any necessary reply
 422                  *      VP's back to the client.
 423                  */
 424                 if (vp) {
 425                         vp2eap(tls_session, vp);
 426                         pairfree(&vp);
 427                 }
 428
 429                 rcode = RLM_MODULE_HANDLED;
 430                 break;
 431
 432         default:
 433                 RDEBUG2("Unknown RADIUS packet type %d: rejecting tunneled user", reply->code);
 434                 rcode = RLM_MODULE_REJECT;
 435                 break;
 436         }
 437
 438         return rcode;
 439 }
 440
 441 #ifdef WITH_PROXY
 442 /*
 443  *      Do post-proxy processing,
 444  */
 445 static int eappeap_postproxy(EAP_HANDLER *handler, void *data)
 446 {
 447         int rcode;
 448         tls_session_t *tls_session = (tls_session_t *) data;
 449         REQUEST *fake, *request = handler->request;
 450
 451         RDEBUG2("Passing reply from proxy back into the tunnel.");
 452
 453         /*
 454          *      If there was a fake request associated with the proxied
 455          *      request, do more processing of it.
 456          */
 457         fake = (REQUEST *) request_data_get(handler->request,
 458                                             handler->request->proxy,
 459                                             REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK);
 460
 461         /*
 462          *      Do the callback, if it exists, and if it was a success.
 463          */
 464         if (fake && (handler->request->proxy_reply->code == PW_AUTHENTICATION_ACK)) {
 465                 peap_tunnel_t *t = tls_session->opaque;
 466
 467                 t->home_access_accept = TRUE;
 468
 469                 /*
 470                  *      Terrible hacks.
 471                  */
 472                 rad_assert(fake->packet == NULL);
 473                 fake->packet = request->proxy;
 474                 fake->packet->src_ipaddr = request->packet->src_ipaddr;
 475                 request->proxy = NULL;
 476
 477                 rad_assert(fake->reply == NULL);
 478                 fake->reply = request->proxy_reply;
 479                 request->proxy_reply = NULL;
 480
 481                 if ((debug_flag > 0) && fr_log_fp) {
 482                         fprintf(fr_log_fp, "server %s {\n", fake->server);
 483                 }
 484
 485                 /*
 486                  *      Perform a post-auth stage, which will get the EAP
 487                  *      handler, too...
 488                  */
 489                 fake->options &= ~RAD_REQUEST_OPTION_PROXY_EAP;
 490                 RDEBUG2("Passing reply back for EAP-MS-CHAP-V2");
 491                 rcode = module_post_proxy(0, fake);
 492
 493                 /*
 494                  *      FIXME: If rcode returns fail, do something
 495                  *      intelligent...
 496                  */
 497                 rcode = rad_postauth(fake);
 498
 499                 if ((debug_flag > 0) && fr_log_fp) {
 500                         fprintf(fr_log_fp, "} # server %s\n", fake->server);
 501
 502                         RDEBUG("Final reply from tunneled session code %d",
 503                                fake->reply->code);
 504
 505                         debug_pair_list(fake->reply->vps);
 506                 }
 507
 508                 /*
 509                  *      Terrible hacks.
 510                  */
 511                 request->proxy = fake->packet;
 512                 fake->packet = NULL;
 513                 request->proxy_reply = fake->reply;
 514                 fake->reply = NULL;
 515
 516                 /*
 517                  *      And we're done with this request.
 518                  */
 519
 520                 switch (rcode) {
 521                 case RLM_MODULE_FAIL:
 522                         request_free(&fake);
 523                         eaptls_fail(handler, 0);
 524                         return 0;
 525                         break;
 526
 527                 default:  /* Don't Do Anything */
 528                         RDEBUG2("Got reply %d", request->proxy_reply->code);
 529                         break;
 530                 }
 531         }
 532         request_free(&fake);    /* robust if fake == NULL */
 533
 534         /*
 535          *      If there was no EAP-Message in the reply packet, then
 536          *      we know that we're supposed to re-run the "authenticate"
 537          *      stage, in order to get the right kind of handling...
 538          */
 539
 540         /*
 541          *      Process the reply from the home server.
 542          */
 543
 544         rcode = process_reply(handler, tls_session, handler->request,
 545                               handler->request->proxy_reply);
 546
 547         /*
 548          *      The proxy code uses the reply from the home server as
 549          *      the basis for the reply to the NAS.  We don't want that,
 550          *      so we toss it, after we've had our way with it.
 551          */
 552         pairfree(&handler->request->proxy_reply->vps);
 553
 554         switch (rcode) {
 555         case RLM_MODULE_REJECT:
 556                 RDEBUG2("Reply was rejected");
 557                 eaptls_fail(handler, 0);
 558                 return 0;
 559
 560         case RLM_MODULE_HANDLED:
 561                 RDEBUG2("Reply was handled");
 562                 eaptls_request(handler->eap_ds, tls_session);
 563                 return 1;
 564
 565         case RLM_MODULE_OK:
 566                 RDEBUG2("Reply was OK");
 567
 568                 /*
 569                  *      Success: Automatically return MPPE keys.
 570                  */
 571                 return eaptls_success(handler, 0);
 572
 573         default:
 574                 RDEBUG2("Reply was unknown.");
 575                 break;
 576         }
 577
 578         eaptls_fail(handler, 0);
 579         return 0;
 580 }
 581
 582 /*
 583  *      Free a request.
 584  */
 585 static void my_request_free(void *data)
 586 {
 587         REQUEST *request = (REQUEST *)data;
 588
 589         request_free(&request);
 590 }
 591 #endif
 592
 593
 594 static void print_tunneled_data(uint8_t *data, size_t data_len)
 595 {
 596         size_t i;
 597
 598         if ((debug_flag > 2) && fr_log_fp) {
 599                 for (i = 0; i < data_len; i++) {
 600                         if ((i & 0x0f) == 0) fprintf(fr_log_fp, "  PEAP tunnel data in %04x: ", i);
 601
 602                         fprintf(fr_log_fp, "%02x ", data[i]);
 603
 604                         if ((i & 0x0f) == 0x0f) fprintf(fr_log_fp, "\n");
 605                 }
 606                 if ((data_len & 0x0f) != 0) fprintf(fr_log_fp, "\n");
 607         }
 608 }
 609
 610
 611 /*
 612  *      Process the pseudo-EAP contents of the tunneled data.
 613  */
 614 int eappeap_process(EAP_HANDLER *handler, tls_session_t *tls_session)
 615 {
 616         peap_tunnel_t *t = tls_session->opaque;
 617         REQUEST *fake;
 618         VALUE_PAIR *vp;
 619         int rcode = RLM_MODULE_REJECT;
 620         const uint8_t   *data;
 621         unsigned int data_len;
 622
 623         REQUEST *request = handler->request;
 624         EAP_DS *eap_ds = handler->eap_ds;
 625
 626         /*
 627          *      Just look at the buffer directly, without doing
 628          *      record_minus.  This lets us avoid another data copy.
 629          */
 630         data_len = tls_session->clean_out.used;
 631         tls_session->clean_out.used = 0;
 632         data = tls_session->clean_out.data;
 633
 634         if (!eapmessage_verify(request, data, data_len)) {
 635                 RDEBUG2("FAILED processing PEAP: Tunneled data is invalid.");
 636                 if (debug_flag > 2) print_tunneled_data(data, data_len);
 637                 return RLM_MODULE_REJECT;
 638         }
 639
 640         switch (t->status) {
 641         /*
 642          *      If we authenticated the user, then it's OK.
 643          */
 644         case PEAP_STATUS_SENT_TLV_SUCCESS:
 645                 if (eappeap_check_tlv(request, data)) {
 646                         RDEBUG2("Success");
 647                         return RLM_MODULE_OK;
 648                 }
 649
 650                 /*
 651                  *      Otherwise, the client rejected the session
 652                  *      resumption.  If the session is being re-used,
 653                  *      we need to do a full authentication.
 654                  *
 655                  *      We do this by sending an EAP-Identity request
 656                  *      inside of the PEAP tunnel.
 657                  */
 658                 if ((t->session_resumption_state != PEAP_RESUMPTION_NO) &&
 659                     SSL_session_reused(tls_session->ssl)) {
 660                         RDEBUG2("Client rejected session resumption.  Re-starting full authentication");
 661
 662                         /*
 663                          *      Mark session resumption status.
 664                          */
 665                         t->status = 0;
 666                         t->session_resumption_state = PEAP_RESUMPTION_NO;
 667
 668                         eappeap_identity(handler, tls_session);
 669                         return RLM_MODULE_HANDLED;
 670                 }
 671
 672                 return RLM_MODULE_REJECT;
 673
 674         /*
 675          *      Damned if I know why the clients continue sending EAP
 676          *      packets after we told them to f*ck off.
 677          */
 678         case PEAP_STATUS_SENT_TLV_FAILURE:
 679                 RDEBUG(" The users session was previously rejected: returning reject (again.)");
 680                 RDEBUG(" *** This means you need to read the PREVIOUS messages in the debug output");
 681                 RDEBUG(" *** to find out the reason why the user was rejected.");
 682                 RDEBUG(" *** Look for \"reject\" or \"fail\".  Those earlier messages will tell you.");
 683                 RDEBUG(" *** what went wrong, and how to fix the problem.");
 684                 return RLM_MODULE_REJECT;
 685         }
 686
 687         fake = request_alloc_fake(request);
 688
 689         rad_assert(fake->packet->vps == NULL);
 690
 691         fake->packet->vps = eap2vp(request, eap_ds, data, data_len);
 692         if (!fake->packet->vps) {
 693                 request_free(&fake);
 694                 RDEBUG2("Unable to convert tunneled EAP packet to internal server data structures");
 695                 return PW_AUTHENTICATION_REJECT;
 696         }
 697
 698         if ((debug_flag > 0) && fr_log_fp) {
 699                 RDEBUG("Got tunneled request");
 700
 701                 debug_pair_list(fake->packet->vps);
 702
 703                 fprintf(fr_log_fp, "server %s {\n",
 704                         (fake->server == NULL) ? "" : fake->server);
 705         }
 706
 707         /*
 708          *      Tell the request that it's a fake one.
 709          */
 710         vp = pairmake("Freeradius-Proxied-To", "127.0.0.1", T_OP_EQ);
 711         if (vp) {
 712                 pairadd(&fake->packet->vps, vp);
 713         }
 714
 715         /*
 716          *      Update other items in the REQUEST data structure.
 717          */
 718         if (!t->username) {
 719                 /*
 720                  *      There's no User-Name in the tunneled session,
 721                  *      so we add one here, by pulling it out of the
 722                  *      EAP-Identity packet.
 723                  */
 724                 if ((data[0] == PW_EAP_IDENTITY) && (data_len > 1)) {
 725                         t->username = pairmake("User-Name", "", T_OP_EQ);
 726                         rad_assert(t->username != NULL);
 727
 728                         memcpy(t->username->vp_strvalue, data + 1, data_len - 1);
 729                         t->username->length = data_len - 1;
 730                         t->username->vp_strvalue[t->username->length] = 0;
 731                         DEBUG2("  PEAP: Got tunneled identity of %s", t->username->vp_strvalue);
 732
 733                         /*
 734                          *      If there's a default EAP type,
 735                          *      set it here.
 736                          */
 737                         if (t->default_eap_type != 0) {
 738                                 DEBUG2("  PEAP: Setting default EAP type for tunneled EAP session.");
 739                                 vp = pairmake("EAP-Type", "0", T_OP_EQ);
 740                                 vp->vp_integer = t->default_eap_type;
 741                                 pairadd(&fake->config_items, vp);
 742                         }
 743                 }
 744         } /* else there WAS a t->username */
 745
 746         if (t->username) {
 747                 vp = paircopy(t->username);
 748                 pairadd(&fake->packet->vps, vp);
 749                 fake->username = pairfind(fake->packet->vps, PW_USER_NAME, 0);
 750                 DEBUG2("  PEAP: Setting User-Name to %s",
 751                        fake->username->vp_strvalue);
 752         }
 753
 754         /*
 755          *      Add the State attribute, too, if it exists.
 756          */
 757         if (t->state) {
 758                 vp = paircopy(t->state);
 759                 if (vp) pairadd(&fake->packet->vps, vp);
 760         }
 761
 762         /*
 763          *      If this is set, we copy SOME of the request attributes
 764          *      from outside of the tunnel to inside of the tunnel.
 765          *
 766          *      We copy ONLY those attributes which do NOT already
 767          *      exist in the tunneled request.
 768          *
 769          *      This code is copied from ../rlm_eap_ttls/ttls.c
 770          */
 771         if (t->copy_request_to_tunnel) {
 772                 VALUE_PAIR *copy;
 773
 774                 for (vp = request->packet->vps; vp != NULL; vp = vp->next) {
 775                         /*
 776                          *      The attribute is a server-side thingy,
 777                          *      don't copy it.
 778                          */
 779                         if ((vp->attribute > 255) &&
 780                             (vp->vendor == 0)) {
 781                                 continue;
 782                         }
 783
 784                         /*
 785                          *      The outside attribute is already in the
 786                          *      tunnel, don't copy it.
 787                          *
 788                          *      This works for BOTH attributes which
 789                          *      are originally in the tunneled request,
 790                          *      AND attributes which are copied there
 791                          *      from below.
 792                          */
 793                         if (pairfind(fake->packet->vps, vp->attribute, vp->vendor)) {
 794                                 continue;
 795                         }
 796
 797                         /*
 798                          *      Some attributes are handled specially.
 799                          */
 800                         switch (vp->attribute) {
 801                                 /*
 802                                  *      NEVER copy Message-Authenticator,
 803                                  *      EAP-Message, or State.  They're
 804                                  *      only for outside of the tunnel.
 805                                  */
 806                         case PW_USER_NAME:
 807                         case PW_USER_PASSWORD:
 808                         case PW_CHAP_PASSWORD:
 809                         case PW_CHAP_CHALLENGE:
 810                         case PW_PROXY_STATE:
 811                         case PW_MESSAGE_AUTHENTICATOR:
 812                         case PW_EAP_MESSAGE:
 813                         case PW_STATE:
 814                                 continue;
 815                                 break;
 816
 817                                 /*
 818                                  *      By default, copy it over.
 819                                  */
 820                         default:
 821                                 break;
 822                         }
 823
 824                         /*
 825                          *      Don't copy from the head, we've already
 826                          *      checked it.
 827                          */
 828                         copy = paircopy2(vp, vp->attribute, vp->vendor);
 829                         pairadd(&fake->packet->vps, copy);
 830                 }
 831         }
 832
 833         if ((vp = pairfind(request->config_items, PW_VIRTUAL_SERVER, 0)) != NULL) {
 834                 fake->server = vp->vp_strvalue;
 835
 836         } else if (t->virtual_server) {
 837                 fake->server = t->virtual_server;
 838
 839         } /* else fake->server == request->server */
 840
 841         if ((debug_flag > 0) && fr_log_fp) {
 842                 fprintf(fr_log_fp, "Sending tunneled request\n");
 843
 844                 debug_pair_list(fake->packet->vps);
 845
 846                 fprintf(fr_log_fp, "server %s {\n",
 847                         (fake->server == NULL) ? "" : fake->server);
 848         }
 849
 850         /*
 851          *      Call authentication recursively, which will
 852          *      do PAP, CHAP, MS-CHAP, etc.
 853          */
 854         rad_authenticate(fake);
 855
 856         /*
 857          *      Note that we don't do *anything* with the reply
 858          *      attributes.
 859          */
 860         if ((debug_flag > 0) && fr_log_fp) {
 861                 fprintf(fr_log_fp, "} # server %s\n",
 862                         (fake->server == NULL) ? "" : fake->server);
 863
 864                 RDEBUG("Got tunneled reply code %d", fake->reply->code);
 865
 866                 debug_pair_list(fake->reply->vps);
 867         }
 868
 869         /*
 870          *      Decide what to do with the reply.
 871          */
 872         switch (fake->reply->code) {
 873         case 0:                 /* No reply code, must be proxied... */
 874 #ifdef WITH_PROXY
 875                 vp = pairfind(fake->config_items, PW_PROXY_TO_REALM, 0);
 876
 877                 if (vp) {
 878                         eap_tunnel_data_t *tunnel;
 879
 880                         /*
 881                          *      The tunneled request was NOT handled,
 882                          *      it has to be proxied.  This means that
 883                          *      the "authenticate" stage was never
 884                          *      performed.
 885                          *
 886                          *      If we are told to NOT proxy the
 887                          *      tunneled request as EAP, then this
 888                          *      means that we've got to decode it,
 889                          *      which means that we MUST run the
 890                          *      "authenticate" portion by hand, here.
 891                          *
 892                          *      Once the tunneled EAP session is ALMOST
 893                          *      done, THEN we proxy it...
 894                          */
 895                         if (!t->proxy_tunneled_request_as_eap) {
 896                                 fake->options |= RAD_REQUEST_OPTION_PROXY_EAP;
 897
 898                                 /*
 899                                  *      Hmm... should we check for
 900                                  *      Auth-Type & EAP-Message here?
 901                                  */
 902
 903
 904                                 /*
 905                                  *      Run the EAP authentication.
 906                                  */
 907                                 DEBUG2("  PEAP: Calling authenticate in order to initiate tunneled EAP session.");
 908                                 rcode = module_authenticate(PW_AUTHTYPE_EAP, fake);
 909                                 if (rcode == RLM_MODULE_OK) {
 910                                         /*
 911                                          *      Authentication succeeded! Rah!
 912                                          */
 913                                         fake->reply->code = PW_AUTHENTICATION_ACK;
 914                                         goto do_process;
 915                                 }
 916
 917                                 if (rcode != RLM_MODULE_HANDLED) {
 918                                         DEBUG2("  PEAP: Can't handle the return code %d", rcode);
 919                                         rcode = RLM_MODULE_REJECT;
 920                                         goto done;
 921                                 }
 922
 923                                 /*
 924                                  *      The module decided it wasn't
 925                                  *      done.  Handle it like normal.
 926                                  */
 927                                 if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) == 0) {
 928                                         DEBUG2("    PEAP: Cancelling proxy to realm %s until the tunneled EAP session has been established", vp->vp_strvalue);
 929                                         goto do_process;
 930                                 }
 931
 932                                 /*
 933                                  *      The module has decoded the
 934                                  *      EAP-Message into another set
 935                                  *      of attributes.
 936                                  */
 937                                 pairdelete(&fake->packet->vps,
 938                                            PW_EAP_MESSAGE, 0);
 939                         }
 940
 941                         DEBUG2("  PEAP: Tunneled authentication will be proxied to %s", vp->vp_strvalue);
 942
 943                         /*
 944                          *      Tell the original request that it's going
 945                          *      to be proxied.
 946                          */
 947                         pairmove2(&(request->config_items),
 948                                   &(fake->config_items),
 949                                   PW_PROXY_TO_REALM, 0);
 950
 951                         /*
 952                          *      Seed the proxy packet with the
 953                          *      tunneled request.
 954                          */
 955                         rad_assert(request->proxy == NULL);
 956                         request->proxy = fake->packet;
 957                         memset(&request->proxy->src_ipaddr, 0,
 958                                sizeof(request->proxy->src_ipaddr));
 959                         memset(&request->proxy->src_ipaddr, 0,
 960                                sizeof(request->proxy->src_ipaddr));
 961                         request->proxy->src_port = 0;
 962                         request->proxy->dst_port = 0;
 963                         fake->packet = NULL;
 964                         rad_free(&fake->reply);
 965                         fake->reply = NULL;
 966
 967                         /*
 968                          *      Set up the callbacks for the tunnel
 969                          */
 970                         tunnel = rad_malloc(sizeof(*tunnel));
 971                         memset(tunnel, 0, sizeof(*tunnel));
 972
 973                         tunnel->tls_session = tls_session;
 974                         tunnel->callback = eappeap_postproxy;
 975
 976                         /*
 977                          *      Associate the callback with the request.
 978                          */
 979                         rcode = request_data_add(request,
 980                                                  request->proxy,
 981                                                  REQUEST_DATA_EAP_TUNNEL_CALLBACK,
 982                                                  tunnel, free);
 983                         rad_assert(rcode == 0);
 984
 985                         /*
 986                          *      We're not proxying it as EAP, so we've got
 987                          *      to do the callback later.
 988                          */
 989                         if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) != 0) {
 990                                 DEBUG2("  PEAP: Remembering to do EAP-MS-CHAP-V2 post-proxy.");
 991
 992                                 /*
 993                                  *      rlm_eap.c has taken care of associating
 994                                  *      the handler with the fake request.
 995                                  *
 996                                  *      So we associate the fake request with
 997                                  *      this request.
 998                                  */
 999                                 rcode = request_data_add(request,
1000                                                          request->proxy,
1001                                                          REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK,
1002                                                          fake, my_request_free);
1003                                 rad_assert(rcode == 0);
1004
1005                                 /*
1006                                  *      Do NOT free the fake request!
1007                                  */
1008                                 return RLM_MODULE_UPDATED;
1009                         }
1010
1011                         /*
1012                          *      Didn't authenticate the packet, but
1013                          *      we're proxying it.
1014                          */
1015                         rcode = RLM_MODULE_UPDATED;
1016
1017                 } else
1018 #endif  /* WITH_PROXY */
1019                   {
1020                         DEBUG2("  PEAP: Unknown RADIUS packet type %d: rejecting tunneled user", fake->reply->code);
1021                         rcode = RLM_MODULE_REJECT;
1022                   }
1023                 break;
1024
1025         default:
1026         do_process:
1027                 rcode = process_reply(handler, tls_session, request,
1028                                       fake->reply);
1029                 break;
1030         }
1031
1032  done:
1033         request_free(&fake);
1034
1035         return rcode;
1036 }