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(request, 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(request, 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(handler->request, 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(REQUEST *request, 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(request, 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(request, 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 const char *peap_state(peap_tunnel_t *t)
 595 {
 596         switch (t->status) {
 597                 case PEAP_STATUS_TUNNEL_ESTABLISHED:
 598                         return "TUNNEL ESTABLISHED";
 599                 case PEAP_STATUS_INNER_IDENTITY_REQ_SENT:
 600                         return "WAITING FOR INNER IDENTITY";
 601                 case PEAP_STATUS_SENT_TLV_SUCCESS:
 602                         return "send tlv success";
 603                 case PEAP_STATUS_SENT_TLV_FAILURE:
 604                         return "send tlv failure";
 605                 case PEAP_STATUS_PHASE2_INIT:
 606                         return "phase2_init";
 607                 case PEAP_STATUS_PHASE2:
 608                         return "phase2";
 609                 default:
 610                         break;
 611         }
 612         return "?";
 613 }
 614
 615 static void print_tunneled_data(const uint8_t *data, size_t data_len)
 616 {
 617         size_t i;
 618
 619         if ((debug_flag > 2) && fr_log_fp) {
 620                 for (i = 0; i < data_len; i++) {
 621                   if ((i & 0x0f) == 0) fprintf(fr_log_fp, "  PEAP tunnel data in %02x: ", (int) i);
 622
 623                         fprintf(fr_log_fp, "%02x ", data[i]);
 624
 625                         if ((i & 0x0f) == 0x0f) fprintf(fr_log_fp, "\n");
 626                 }
 627                 if ((data_len & 0x0f) != 0) fprintf(fr_log_fp, "\n");
 628         }
 629 }
 630
 631
 632 /*
 633  *      Process the pseudo-EAP contents of the tunneled data.
 634  */
 635 int eappeap_process(EAP_HANDLER *handler, tls_session_t *tls_session)
 636 {
 637         peap_tunnel_t *t = tls_session->opaque;
 638         REQUEST *fake;
 639         VALUE_PAIR *vp;
 640         int rcode = RLM_MODULE_REJECT;
 641         const uint8_t   *data;
 642         unsigned int data_len;
 643
 644         REQUEST *request = handler->request;
 645         EAP_DS *eap_ds = handler->eap_ds;
 646
 647         /*
 648          *      Just look at the buffer directly, without doing
 649          *      record_minus.  This lets us avoid another data copy.
 650          */
 651         data_len = tls_session->clean_out.used;
 652         tls_session->clean_out.used = 0;
 653         data = tls_session->clean_out.data;
 654
 655         RDEBUG2("Peap state %s", peap_state(t));
 656
 657         if ((t->status != PEAP_STATUS_TUNNEL_ESTABLISHED) &&
 658             !eapmessage_verify(request, data, data_len)) {
 659                 RDEBUG2("FAILED processing PEAP: Tunneled data is invalid.");
 660                 if (debug_flag > 2) print_tunneled_data(data, data_len);
 661                 return RLM_MODULE_REJECT;
 662         }
 663
 664         switch (t->status) {
 665         case PEAP_STATUS_TUNNEL_ESTABLISHED:
 666                 /* FIXME: should be no data in the buffer here, check & assert? */
 667
 668                 if (SSL_session_reused(tls_session->ssl)) {
 669                         RDEBUG2("Skipping Phase2 because of session resumption");
 670                         t->session_resumption_state = PEAP_RESUMPTION_YES;
 671
 672                         /* we're good, send success TLV */
 673                         t->status = PEAP_STATUS_SENT_TLV_SUCCESS;
 674                         eappeap_success(handler, tls_session);
 675
 676                 } else {
 677                         /* send an identity request */
 678                         t->session_resumption_state = PEAP_RESUMPTION_NO;
 679                         t->status = PEAP_STATUS_INNER_IDENTITY_REQ_SENT;
 680                         eappeap_identity(handler, tls_session);
 681                 }
 682                 return RLM_MODULE_HANDLED;
 683
 684         case PEAP_STATUS_INNER_IDENTITY_REQ_SENT:
 685                 /* we're expecting an identity response */
 686                 if (data[0] != PW_EAP_IDENTITY) {
 687                         RDEBUG("Expected EAP-Identity, got something else.");
 688                         return RLM_MODULE_REJECT;
 689                 }
 690
 691                 if (data_len >= sizeof(t->username->vp_strvalue)) {
 692                         RDEBUG("EAP-Identity is too long");
 693                         return RLM_MODULE_REJECT;
 694                 }
 695
 696                 /*
 697                  *      Save it for later.
 698                  */
 699                 t->username = pairmake("User-Name", "", T_OP_EQ);
 700                 rad_assert(t->username != NULL);
 701
 702                 memcpy(t->username->vp_strvalue, data + 1, data_len - 1);
 703                 t->username->length = data_len - 1;
 704                 t->username->vp_strvalue[t->username->length] = 0;
 705                 RDEBUG("Got inner identity '%s'", t->username->vp_strvalue);
 706
 707                 t->status = PEAP_STATUS_PHASE2_INIT;
 708                 break;
 709
 710         /*
 711          *      If we authenticated the user, then it's OK.
 712          */
 713         case PEAP_STATUS_SENT_TLV_SUCCESS:
 714                 if (eappeap_check_tlv(request, data)) {
 715                         RDEBUG2("Success");
 716                         return RLM_MODULE_OK;
 717                 }
 718
 719                 /*
 720                  *      Otherwise, the client rejected the session
 721                  *      resumption.  If the session is being re-used,
 722                  *      we need to do a full authentication.
 723                  *
 724                  *      We do this by sending an EAP-Identity request
 725                  *      inside of the PEAP tunnel.
 726                  */
 727                 if (t->session_resumption_state == PEAP_RESUMPTION_YES) {
 728                         RDEBUG2("Client rejected session resumption.  Re-starting full authentication");
 729
 730                         /*
 731                          *      Mark session resumption status.
 732                          */
 733                         t->status = PEAP_STATUS_INNER_IDENTITY_REQ_SENT;
 734                         t->session_resumption_state = PEAP_RESUMPTION_NO;
 735
 736                         eappeap_identity(handler, tls_session);
 737                         return RLM_MODULE_HANDLED;
 738                 }
 739
 740                 RDEBUG2("We sent a success, but received something weird in return.");
 741                 return RLM_MODULE_REJECT;
 742
 743         /*
 744          *      Damned if I know why the clients continue sending EAP
 745          *      packets after we told them to f*ck off.
 746          */
 747         case PEAP_STATUS_SENT_TLV_FAILURE:
 748                 RDEBUG(" The users session was previously rejected: returning reject (again.)");
 749                 RDEBUG(" *** This means you need to read the PREVIOUS messages in the debug output");
 750                 RDEBUG(" *** to find out the reason why the user was rejected.");
 751                 RDEBUG(" *** Look for \"reject\" or \"fail\".  Those earlier messages will tell you.");
 752                 RDEBUG(" *** what went wrong, and how to fix the problem.");
 753                 return RLM_MODULE_REJECT;
 754
 755                 case PEAP_STATUS_PHASE2_INIT:
 756                         RDEBUG("In state machine in phase2 init?");
 757
 758                 case PEAP_STATUS_PHASE2:
 759                         break;
 760
 761                 default:
 762                         RDEBUG2("Unhandled state in peap");
 763                         return RLM_MODULE_REJECT;
 764         }
 765
 766         fake = request_alloc_fake(request);
 767
 768         rad_assert(fake->packet->vps == NULL);
 769
 770         switch (t->status) {
 771                 /*
 772                  *      If we're in PHASE2_INIT, the phase2 method hasn't been
 773                  *      sent an Identity packet yet; do so from the stored
 774                  *      username and this will kick off the phase2 eap method
 775                  */
 776
 777         case PEAP_STATUS_PHASE2_INIT: {
 778                 int len = t->username->length + EAP_HEADER_LEN + 1;
 779
 780                 t->status = PEAP_STATUS_PHASE2;
 781
 782                 vp = paircreate(PW_EAP_MESSAGE, 0, PW_TYPE_OCTETS);
 783
 784                 vp->vp_octets[0] = PW_EAP_RESPONSE;
 785                 vp->vp_octets[1] = eap_ds->response->id;
 786                 vp->vp_octets[2] = (len >> 8) & 0xff;
 787                 vp->vp_octets[3] = len & 0xff;
 788                 vp->vp_octets[4] = PW_EAP_IDENTITY;
 789
 790                 memcpy(vp->vp_octets + EAP_HEADER_LEN + 1, t->username->vp_strvalue, t->username->length);
 791                 vp->length = len;
 792
 793                 pairadd(&fake->packet->vps, vp);
 794
 795                 if (t->default_eap_type != 0) {
 796                         RDEBUG2("Setting default EAP type for tunneled EAP session.");
 797                         vp = pairmake("EAP-Type", "0", T_OP_EQ);
 798                         vp->vp_integer = t->default_eap_type;
 799                         pairadd(&fake->config_items, vp);
 800                 }
 801                 break; }
 802
 803         case PEAP_STATUS_PHASE2:
 804                 fake->packet->vps = eap2vp(request, eap_ds, data, data_len);
 805                 if (!fake->packet->vps) {
 806                         request_free(&fake);
 807                         RDEBUG2("Unable to convert tunneled EAP packet to internal server data structures");
 808                         return PW_AUTHENTICATION_REJECT;
 809                 }
 810                 break;
 811
 812         default:
 813                 RDEBUG("Invalid state change in PEAP.");
 814                 return PW_AUTHENTICATION_REJECT;
 815         }
 816
 817         if ((debug_flag > 0) && fr_log_fp) {
 818                 RDEBUG("Got tunneled request");
 819
 820                 debug_pair_list(fake->packet->vps);
 821
 822                 fprintf(fr_log_fp, "server %s {\n",
 823                         (fake->server == NULL) ? "" : fake->server);
 824         }
 825
 826         /*
 827          *      Tell the request that it's a fake one.
 828          */
 829         vp = pairmake("Freeradius-Proxied-To", "127.0.0.1", T_OP_EQ);
 830         if (vp) {
 831                 pairadd(&fake->packet->vps, vp);
 832         }
 833
 834         /*
 835          *      Update other items in the REQUEST data structure.
 836          */
 837         if (!t->username) {
 838                 /*
 839                  *      There's no User-Name in the tunneled session,
 840                  *      so we add one here, by pulling it out of the
 841                  *      EAP-Identity packet.
 842                  */
 843                 if ((data[0] == PW_EAP_IDENTITY) && (data_len > 1)) {
 844                         t->username = pairmake("User-Name", "", T_OP_EQ);
 845                         rad_assert(t->username != NULL);
 846
 847                         memcpy(t->username->vp_strvalue, data + 1, data_len - 1);
 848                         t->username->length = data_len - 1;
 849                         t->username->vp_strvalue[t->username->length] = 0;
 850                         DEBUG2("  PEAP: Got tunneled identity of %s", t->username->vp_strvalue);
 851
 852                         /*
 853                          *      If there's a default EAP type,
 854                          *      set it here.
 855                          */
 856                         if (t->default_eap_type != 0) {
 857                                 DEBUG2("  PEAP: Setting default EAP type for tunneled EAP session.");
 858                                 vp = pairmake("EAP-Type", "0", T_OP_EQ);
 859                                 vp->vp_integer = t->default_eap_type;
 860                                 pairadd(&fake->config_items, vp);
 861                         }
 862                 }
 863         } /* else there WAS a t->username */
 864
 865         if (t->username) {
 866                 vp = paircopy(t->username);
 867                 pairadd(&fake->packet->vps, vp);
 868                 fake->username = pairfind(fake->packet->vps, PW_USER_NAME, 0);
 869                 DEBUG2("  PEAP: Setting User-Name to %s",
 870                        fake->username->vp_strvalue);
 871         }
 872
 873         /*
 874          *      Add the State attribute, too, if it exists.
 875          */
 876         if (t->state) {
 877                 vp = paircopy(t->state);
 878                 if (vp) pairadd(&fake->packet->vps, vp);
 879         }
 880
 881         /*
 882          *      If this is set, we copy SOME of the request attributes
 883          *      from outside of the tunnel to inside of the tunnel.
 884          *
 885          *      We copy ONLY those attributes which do NOT already
 886          *      exist in the tunneled request.
 887          *
 888          *      This code is copied from ../rlm_eap_ttls/ttls.c
 889          */
 890         if (t->copy_request_to_tunnel) {
 891                 VALUE_PAIR *copy;
 892
 893                 for (vp = request->packet->vps; vp != NULL; vp = vp->next) {
 894                         /*
 895                          *      The attribute is a server-side thingy,
 896                          *      don't copy it.
 897                          */
 898                         if ((vp->attribute > 255) &&
 899                             (vp->vendor == 0)) {
 900                                 continue;
 901                         }
 902
 903                         /*
 904                          *      The outside attribute is already in the
 905                          *      tunnel, don't copy it.
 906                          *
 907                          *      This works for BOTH attributes which
 908                          *      are originally in the tunneled request,
 909                          *      AND attributes which are copied there
 910                          *      from below.
 911                          */
 912                         if (pairfind(fake->packet->vps, vp->attribute, vp->vendor)) {
 913                                 continue;
 914                         }
 915
 916                         /*
 917                          *      Some attributes are handled specially.
 918                          */
 919                         switch (vp->attribute) {
 920                                 /*
 921                                  *      NEVER copy Message-Authenticator,
 922                                  *      EAP-Message, or State.  They're
 923                                  *      only for outside of the tunnel.
 924                                  */
 925                         case PW_USER_NAME:
 926                         case PW_USER_PASSWORD:
 927                         case PW_CHAP_PASSWORD:
 928                         case PW_CHAP_CHALLENGE:
 929                         case PW_PROXY_STATE:
 930                         case PW_MESSAGE_AUTHENTICATOR:
 931                         case PW_EAP_MESSAGE:
 932                         case PW_STATE:
 933                                 continue;
 934                                 break;
 935
 936                                 /*
 937                                  *      By default, copy it over.
 938                                  */
 939                         default:
 940                                 break;
 941                         }
 942
 943                         /*
 944                          *      Don't copy from the head, we've already
 945                          *      checked it.
 946                          */
 947                         copy = paircopy2(vp, vp->attribute, vp->vendor);
 948                         pairadd(&fake->packet->vps, copy);
 949                 }
 950         }
 951
 952         if ((vp = pairfind(request->config_items, PW_VIRTUAL_SERVER, 0)) != NULL) {
 953                 fake->server = vp->vp_strvalue;
 954
 955         } else if (t->virtual_server) {
 956                 fake->server = t->virtual_server;
 957
 958         } /* else fake->server == request->server */
 959
 960         if ((debug_flag > 0) && fr_log_fp) {
 961                 fprintf(fr_log_fp, "Sending tunneled request\n");
 962
 963                 debug_pair_list(fake->packet->vps);
 964
 965                 fprintf(fr_log_fp, "server %s {\n",
 966                         (fake->server == NULL) ? "" : fake->server);
 967         }
 968
 969         /*
 970          *      Call authentication recursively, which will
 971          *      do PAP, CHAP, MS-CHAP, etc.
 972          */
 973         rad_authenticate(fake);
 974
 975         /*
 976          *      Note that we don't do *anything* with the reply
 977          *      attributes.
 978          */
 979         if ((debug_flag > 0) && fr_log_fp) {
 980                 fprintf(fr_log_fp, "} # server %s\n",
 981                         (fake->server == NULL) ? "" : fake->server);
 982
 983                 RDEBUG("Got tunneled reply code %d", fake->reply->code);
 984
 985                 debug_pair_list(fake->reply->vps);
 986         }
 987
 988         /*
 989          *      Decide what to do with the reply.
 990          */
 991         switch (fake->reply->code) {
 992         case 0:                 /* No reply code, must be proxied... */
 993 #ifdef WITH_PROXY
 994                 vp = pairfind(fake->config_items, PW_PROXY_TO_REALM, 0);
 995
 996                 if (vp) {
 997                         eap_tunnel_data_t *tunnel;
 998
 999                         /*
1000                          *      The tunneled request was NOT handled,
1001                          *      it has to be proxied.  This means that
1002                          *      the "authenticate" stage was never
1003                          *      performed.
1004                          *
1005                          *      If we are told to NOT proxy the
1006                          *      tunneled request as EAP, then this
1007                          *      means that we've got to decode it,
1008                          *      which means that we MUST run the
1009                          *      "authenticate" portion by hand, here.
1010                          *
1011                          *      Once the tunneled EAP session is ALMOST
1012                          *      done, THEN we proxy it...
1013                          */
1014                         if (!t->proxy_tunneled_request_as_eap) {
1015                                 fake->options |= RAD_REQUEST_OPTION_PROXY_EAP;
1016
1017                                 /*
1018                                  *      Hmm... should we check for
1019                                  *      Auth-Type & EAP-Message here?
1020                                  */
1021
1022
1023                                 /*
1024                                  *      Run the EAP authentication.
1025                                  */
1026                                 DEBUG2("  PEAP: Calling authenticate in order to initiate tunneled EAP session.");
1027                                 rcode = module_authenticate(PW_AUTHTYPE_EAP, fake);
1028                                 if (rcode == RLM_MODULE_OK) {
1029                                         /*
1030                                          *      Authentication succeeded! Rah!
1031                                          */
1032                                         fake->reply->code = PW_AUTHENTICATION_ACK;
1033                                         goto do_process;
1034                                 }
1035
1036                                 if (rcode != RLM_MODULE_HANDLED) {
1037                                         DEBUG2("  PEAP: Can't handle the return code %d", rcode);
1038                                         rcode = RLM_MODULE_REJECT;
1039                                         goto done;
1040                                 }
1041
1042                                 /*
1043                                  *      The module decided it wasn't
1044                                  *      done.  Handle it like normal.
1045                                  */
1046                                 if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) == 0) {
1047                                         DEBUG2("    PEAP: Cancelling proxy to realm %s until the tunneled EAP session has been established", vp->vp_strvalue);
1048                                         goto do_process;
1049                                 }
1050
1051                                 /*
1052                                  *      The module has decoded the
1053                                  *      EAP-Message into another set
1054                                  *      of attributes.
1055                                  */
1056                                 pairdelete(&fake->packet->vps,
1057                                            PW_EAP_MESSAGE, 0);
1058                         }
1059
1060                         DEBUG2("  PEAP: Tunneled authentication will be proxied to %s", vp->vp_strvalue);
1061
1062                         /*
1063                          *      Tell the original request that it's going
1064                          *      to be proxied.
1065                          */
1066                         pairmove2(&(request->config_items),
1067                                   &(fake->config_items),
1068                                   PW_PROXY_TO_REALM, 0);
1069
1070                         /*
1071                          *      Seed the proxy packet with the
1072                          *      tunneled request.
1073                          */
1074                         rad_assert(request->proxy == NULL);
1075                         request->proxy = fake->packet;
1076                         memset(&request->proxy->src_ipaddr, 0,
1077                                sizeof(request->proxy->src_ipaddr));
1078                         memset(&request->proxy->src_ipaddr, 0,
1079                                sizeof(request->proxy->src_ipaddr));
1080                         request->proxy->src_port = 0;
1081                         request->proxy->dst_port = 0;
1082                         fake->packet = NULL;
1083                         rad_free(&fake->reply);
1084                         fake->reply = NULL;
1085
1086                         /*
1087                          *      Set up the callbacks for the tunnel
1088                          */
1089                         tunnel = rad_malloc(sizeof(*tunnel));
1090                         memset(tunnel, 0, sizeof(*tunnel));
1091
1092                         tunnel->tls_session = tls_session;
1093                         tunnel->callback = eappeap_postproxy;
1094
1095                         /*
1096                          *      Associate the callback with the request.
1097                          */
1098                         rcode = request_data_add(request,
1099                                                  request->proxy,
1100                                                  REQUEST_DATA_EAP_TUNNEL_CALLBACK,
1101                                                  tunnel, free);
1102                         rad_assert(rcode == 0);
1103
1104                         /*
1105                          *      We're not proxying it as EAP, so we've got
1106                          *      to do the callback later.
1107                          */
1108                         if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) != 0) {
1109                                 DEBUG2("  PEAP: Remembering to do EAP-MS-CHAP-V2 post-proxy.");
1110
1111                                 /*
1112                                  *      rlm_eap.c has taken care of associating
1113                                  *      the handler with the fake request.
1114                                  *
1115                                  *      So we associate the fake request with
1116                                  *      this request.
1117                                  */
1118                                 rcode = request_data_add(request,
1119                                                          request->proxy,
1120                                                          REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK,
1121                                                          fake, my_request_free);
1122                                 rad_assert(rcode == 0);
1123
1124                                 /*
1125                                  *      Do NOT free the fake request!
1126                                  */
1127                                 return RLM_MODULE_UPDATED;
1128                         }
1129
1130                         /*
1131                          *      Didn't authenticate the packet, but
1132                          *      we're proxying it.
1133                          */
1134                         rcode = RLM_MODULE_UPDATED;
1135
1136                 } else
1137 #endif  /* WITH_PROXY */
1138                   {
1139                         DEBUG2("  PEAP: Unknown RADIUS packet type %d: rejecting tunneled user", fake->reply->code);
1140                         rcode = RLM_MODULE_REJECT;
1141                   }
1142                 break;
1143
1144         default:
1145         do_process:
1146                 rcode = process_reply(handler, tls_session, request,
1147                                       fake->reply);
1148                 break;
1149         }
1150
1151  done:
1152         request_free(&fake);
1153
1154         return rcode;
1155 }