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         rad_assert(vp != NULL);
 244
 245         /*
 246          *      Skip the id, code, and length.  Just write the EAP
 247          *      type & data to the client.
 248          */
 249 #ifndef NDEBUG
 250         if ((debug_flag > 2) && fr_log_fp) {
 251                 size_t i, total;
 252                 VALUE_PAIR *this;
 253
 254                 total = 0;
 255
 256                 for (this = vp; this != NULL; this = this->next) {
 257                         int start = 0;
 258
 259                         if (this == vp) start = EAP_HEADER_LEN;
 260
 261                         for (i = start; i < vp->length; i++) {
 262                           if ((total & 0x0f) == 0) fprintf(fr_log_fp, "  PEAP tunnel data out %04x: ", (int) total);
 263
 264                                 fprintf(fr_log_fp, "%02x ", vp->vp_octets[i]);
 265
 266                                 if ((total & 0x0f) == 0x0f) fprintf(fr_log_fp, "\n");
 267                                 total++;
 268                         }
 269                 }
 270                 if ((total & 0x0f) != 0) fprintf(fr_log_fp, "\n");
 271         }
 272 #endif
 273
 274         /*
 275          *      Send the EAP data, WITHOUT the header.
 276          */
 277         (tls_session->record_plus)(&tls_session->clean_in,
 278                                    vp->vp_octets + EAP_HEADER_LEN,
 279                                    vp->length - EAP_HEADER_LEN);
 280
 281         /*
 282          *      Send the rest of the EAP data.
 283          */
 284         for (vp = vp->next; vp != NULL; vp = vp->next) {
 285                 (tls_session->record_plus)(&tls_session->clean_in,
 286                                            vp->vp_octets, vp->length);
 287         }
 288
 289         tls_handshake_send(request, tls_session);
 290
 291         return 1;
 292 }
 293
 294
 295 /*
 296  *      See if there's a TLV in the response.
 297  */
 298 static int eappeap_check_tlv(REQUEST *request, const uint8_t *data)
 299 {
 300         const eap_packet_t *eap_packet = (const eap_packet_t *) data;
 301
 302         /*
 303          *      Look for success or failure.
 304          */
 305         if ((eap_packet->code == PW_EAP_RESPONSE) &&
 306             (eap_packet->data[0] == PW_EAP_TLV)) {
 307                 if (data[10] == EAP_TLV_SUCCESS) {
 308                         return 1;
 309                 }
 310
 311                 if (data[10] == EAP_TLV_FAILURE) {
 312                         RDEBUG2("Client rejected our response.  The password is probably incorrect.");
 313                         return 0;
 314                 }
 315         }
 316
 317         return 0;
 318 }
 319
 320
 321 /*
 322  *      Use a reply packet to determine what to do.
 323  */
 324 static int process_reply(EAP_HANDLER *handler, tls_session_t *tls_session,
 325                          REQUEST *request, RADIUS_PACKET *reply)
 326 {
 327         int rcode = RLM_MODULE_REJECT;
 328         VALUE_PAIR *vp;
 329         peap_tunnel_t *t = tls_session->opaque;
 330
 331         if ((debug_flag > 0) && fr_log_fp) {
 332                 RDEBUG("Got tunneled reply RADIUS code %d",
 333                        reply->code);
 334
 335                 debug_pair_list(reply->vps);
 336         }
 337
 338         switch (reply->code) {
 339         case PW_AUTHENTICATION_ACK:
 340                 RDEBUG2("Tunneled authentication was successful.");
 341                 t->status = PEAP_STATUS_SENT_TLV_SUCCESS;
 342                 eappeap_success(handler, tls_session);
 343                 rcode = RLM_MODULE_HANDLED;
 344
 345                 /*
 346                  *      If we've been told to use the attributes from
 347                  *      the reply, then do so.
 348                  *
 349                  *      WARNING: This may leak information about the
 350                  *      tunneled user!
 351                  */
 352                 if (t->use_tunneled_reply) {
 353                         RDEBUG2("Saving tunneled attributes for later");
 354
 355                         /*
 356                          *      Clean up the tunneled reply.
 357                          */
 358                         pairdelete(&reply->vps, PW_PROXY_STATE, 0);
 359                         pairdelete(&reply->vps, PW_EAP_MESSAGE, 0);
 360                         pairdelete(&reply->vps, PW_MESSAGE_AUTHENTICATOR, 0);
 361
 362                         /*
 363                          *      Delete MPPE keys & encryption policy.  We don't
 364                          *      want these here.
 365                          */
 366                         pairdelete(&reply->vps, 7, VENDORPEC_MICROSOFT);
 367                         pairdelete(&reply->vps, 8, VENDORPEC_MICROSOFT);
 368                         pairdelete(&reply->vps, 16, VENDORPEC_MICROSOFT);
 369                         pairdelete(&reply->vps, 17, VENDORPEC_MICROSOFT);
 370
 371                         t->accept_vps = reply->vps;
 372                         reply->vps = NULL;
 373                 }
 374                 break;
 375
 376         case PW_AUTHENTICATION_REJECT:
 377                 RDEBUG2("Tunneled authentication was rejected.");
 378                 t->status = PEAP_STATUS_SENT_TLV_FAILURE;
 379                 eappeap_failure(handler, tls_session);
 380                 rcode = RLM_MODULE_HANDLED;
 381                 break;
 382
 383         case PW_ACCESS_CHALLENGE:
 384                 RDEBUG2("Got tunneled Access-Challenge");
 385
 386                 /*
 387                  *      Keep the State attribute, if necessary.
 388                  *
 389                  *      Get rid of the old State, too.
 390                  */
 391                 pairfree(&t->state);
 392                 pairmove2(&t->state, &(reply->vps), PW_STATE, 0);
 393
 394                 /*
 395                  *      PEAP takes only EAP-Message attributes inside
 396                  *      of the tunnel.  Any Reply-Message in the
 397                  *      Access-Challenge is ignored.
 398                  */
 399                 vp = NULL;
 400                 pairmove2(&vp, &(reply->vps), PW_EAP_MESSAGE, 0);
 401
 402                 /*
 403                  *      Handle EAP-MSCHAP-V2, where Access-Accept's
 404                  *      from the home server may contain MS-CHAP-Success,
 405                  *      which the module turns into challenges, so that
 406                  *      the client may respond to the challenge with
 407                  *      an "ack" packet.
 408                  */
 409                 if (t->home_access_accept && t->use_tunneled_reply) {
 410                         RDEBUG2("Saving tunneled attributes for later");
 411
 412                         /*
 413                          *      Clean up the tunneled reply.
 414                          */
 415                         pairdelete(&reply->vps, PW_PROXY_STATE, 0);
 416                         pairdelete(&reply->vps, PW_MESSAGE_AUTHENTICATOR, 0);
 417
 418                         t->accept_vps = reply->vps;
 419                         reply->vps = NULL;
 420                 }
 421
 422                 /*
 423                  *      Handle the ACK, by tunneling any necessary reply
 424                  *      VP's back to the client.
 425                  */
 426                 if (vp) {
 427                         vp2eap(request, tls_session, vp);
 428                         pairfree(&vp);
 429                 }
 430
 431                 rcode = RLM_MODULE_HANDLED;
 432                 break;
 433
 434         default:
 435                 RDEBUG2("Unknown RADIUS packet type %d: rejecting tunneled user", reply->code);
 436                 rcode = RLM_MODULE_REJECT;
 437                 break;
 438         }
 439
 440         return rcode;
 441 }
 442
 443 #ifdef WITH_PROXY
 444 /*
 445  *      Do post-proxy processing,
 446  */
 447 static int eappeap_postproxy(EAP_HANDLER *handler, void *data)
 448 {
 449         int rcode;
 450         tls_session_t *tls_session = (tls_session_t *) data;
 451         REQUEST *fake, *request = handler->request;
 452
 453         rad_assert(request != NULL);
 454         RDEBUG2("Passing reply from proxy back into the tunnel.");
 455
 456         /*
 457          *      If there was a fake request associated with the proxied
 458          *      request, do more processing of it.
 459          */
 460         fake = (REQUEST *) request_data_get(handler->request,
 461                                             handler->request->proxy,
 462                                             REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK);
 463
 464         /*
 465          *      Do the callback, if it exists, and if it was a success.
 466          */
 467         if (fake && (handler->request->proxy_reply->code == PW_AUTHENTICATION_ACK)) {
 468                 peap_tunnel_t *t = tls_session->opaque;
 469
 470                 t->home_access_accept = TRUE;
 471
 472                 /*
 473                  *      Terrible hacks.
 474                  */
 475                 rad_assert(fake->packet == NULL);
 476                 fake->packet = request->proxy;
 477                 fake->packet->src_ipaddr = request->packet->src_ipaddr;
 478                 request->proxy = NULL;
 479
 480                 rad_assert(fake->reply == NULL);
 481                 fake->reply = request->proxy_reply;
 482                 request->proxy_reply = NULL;
 483
 484                 if ((debug_flag > 0) && fr_log_fp) {
 485                         fprintf(fr_log_fp, "server %s {\n", fake->server);
 486                 }
 487
 488                 /*
 489                  *      Perform a post-auth stage, which will get the EAP
 490                  *      handler, too...
 491                  */
 492                 fake->options &= ~RAD_REQUEST_OPTION_PROXY_EAP;
 493                 RDEBUG2("Passing reply back for EAP-MS-CHAP-V2");
 494                 module_post_proxy(0, fake);
 495
 496                 /*
 497                  *      FIXME: If rcode returns fail, do something
 498                  *      intelligent...
 499                  */
 500                 rcode = rad_postauth(fake);
 501
 502                 if ((debug_flag > 0) && fr_log_fp) {
 503                         fprintf(fr_log_fp, "} # server %s\n", fake->server);
 504
 505                         RDEBUG("Final reply from tunneled session code %d",
 506                                fake->reply->code);
 507
 508                         debug_pair_list(fake->reply->vps);
 509                 }
 510
 511                 /*
 512                  *      Terrible hacks.
 513                  */
 514                 request->proxy = fake->packet;
 515                 fake->packet = NULL;
 516                 request->proxy_reply = fake->reply;
 517                 fake->reply = NULL;
 518
 519                 /*
 520                  *      And we're done with this request.
 521                  */
 522
 523                 switch (rcode) {
 524                 case RLM_MODULE_FAIL:
 525                         request_free(&fake);
 526                         eaptls_fail(handler, 0);
 527                         return 0;
 528                         break;
 529
 530                 default:  /* Don't Do Anything */
 531                         RDEBUG2("Got reply %d", request->proxy_reply->code);
 532                         break;
 533                 }
 534         }
 535         request_free(&fake);    /* robust if fake == NULL */
 536
 537         /*
 538          *      If there was no EAP-Message in the reply packet, then
 539          *      we know that we're supposed to re-run the "authenticate"
 540          *      stage, in order to get the right kind of handling...
 541          */
 542
 543         /*
 544          *      Process the reply from the home server.
 545          */
 546
 547         rcode = process_reply(handler, tls_session, handler->request,
 548                               handler->request->proxy_reply);
 549
 550         /*
 551          *      The proxy code uses the reply from the home server as
 552          *      the basis for the reply to the NAS.  We don't want that,
 553          *      so we toss it, after we've had our way with it.
 554          */
 555         pairfree(&handler->request->proxy_reply->vps);
 556
 557         switch (rcode) {
 558         case RLM_MODULE_REJECT:
 559                 RDEBUG2("Reply was rejected");
 560                 eaptls_fail(handler, 0);
 561                 return 0;
 562
 563         case RLM_MODULE_HANDLED:
 564                 RDEBUG2("Reply was handled");
 565                 eaptls_request(handler->eap_ds, tls_session);
 566                 return 1;
 567
 568         case RLM_MODULE_OK:
 569                 RDEBUG2("Reply was OK");
 570
 571                 /*
 572                  *      Success: Automatically return MPPE keys.
 573                  */
 574                 return eaptls_success(handler, 0);
 575
 576         default:
 577                 RDEBUG2("Reply was unknown.");
 578                 break;
 579         }
 580
 581         eaptls_fail(handler, 0);
 582         return 0;
 583 }
 584
 585 /*
 586  *      Free a request.
 587  */
 588 static void my_request_free(void *data)
 589 {
 590         REQUEST *request = (REQUEST *)data;
 591
 592         request_free(&request);
 593 }
 594 #endif
 595
 596
 597 static const char *peap_state(peap_tunnel_t *t)
 598 {
 599         switch (t->status) {
 600                 case PEAP_STATUS_TUNNEL_ESTABLISHED:
 601                         return "TUNNEL ESTABLISHED";
 602                 case PEAP_STATUS_INNER_IDENTITY_REQ_SENT:
 603                         return "WAITING FOR INNER IDENTITY";
 604                 case PEAP_STATUS_SENT_TLV_SUCCESS:
 605                         return "send tlv success";
 606                 case PEAP_STATUS_SENT_TLV_FAILURE:
 607                         return "send tlv failure";
 608                 case PEAP_STATUS_PHASE2_INIT:
 609                         return "phase2_init";
 610                 case PEAP_STATUS_PHASE2:
 611                         return "phase2";
 612                 default:
 613                         break;
 614         }
 615         return "?";
 616 }
 617
 618 static void print_tunneled_data(const uint8_t *data, size_t data_len)
 619 {
 620         size_t i;
 621
 622         if ((debug_flag > 2) && fr_log_fp) {
 623                 for (i = 0; i < data_len; i++) {
 624                   if ((i & 0x0f) == 0) fprintf(fr_log_fp, "  PEAP tunnel data in %02x: ", (int) i);
 625
 626                         fprintf(fr_log_fp, "%02x ", data[i]);
 627
 628                         if ((i & 0x0f) == 0x0f) fprintf(fr_log_fp, "\n");
 629                 }
 630                 if ((data_len & 0x0f) != 0) fprintf(fr_log_fp, "\n");
 631         }
 632 }
 633
 634
 635 /*
 636  *      Process the pseudo-EAP contents of the tunneled data.
 637  */
 638 int eappeap_process(EAP_HANDLER *handler, tls_session_t *tls_session)
 639 {
 640         peap_tunnel_t *t = tls_session->opaque;
 641         REQUEST *fake;
 642         VALUE_PAIR *vp;
 643         int rcode = RLM_MODULE_REJECT;
 644         const uint8_t   *data;
 645         unsigned int data_len;
 646
 647         REQUEST *request = handler->request;
 648         EAP_DS *eap_ds = handler->eap_ds;
 649
 650         rad_assert(request != NULL);
 651
 652         /*
 653          *      Just look at the buffer directly, without doing
 654          *      record_minus.  This lets us avoid another data copy.
 655          */
 656         data_len = tls_session->clean_out.used;
 657         tls_session->clean_out.used = 0;
 658         data = tls_session->clean_out.data;
 659
 660         RDEBUG2("Peap state %s", peap_state(t));
 661
 662         if ((t->status != PEAP_STATUS_TUNNEL_ESTABLISHED) &&
 663             !eapmessage_verify(request, data, data_len)) {
 664                 RDEBUG2("FAILED processing PEAP: Tunneled data is invalid.");
 665                 if (debug_flag > 2) print_tunneled_data(data, data_len);
 666                 return RLM_MODULE_REJECT;
 667         }
 668
 669         switch (t->status) {
 670         case PEAP_STATUS_TUNNEL_ESTABLISHED:
 671                 /* FIXME: should be no data in the buffer here, check & assert? */
 672
 673                 if (SSL_session_reused(tls_session->ssl)) {
 674                         RDEBUG2("Skipping Phase2 because of session resumption");
 675                         t->session_resumption_state = PEAP_RESUMPTION_YES;
 676
 677                         /* we're good, send success TLV */
 678                         t->status = PEAP_STATUS_SENT_TLV_SUCCESS;
 679                         eappeap_success(handler, tls_session);
 680
 681                 } else {
 682                         /* send an identity request */
 683                         t->session_resumption_state = PEAP_RESUMPTION_NO;
 684                         t->status = PEAP_STATUS_INNER_IDENTITY_REQ_SENT;
 685                         eappeap_identity(handler, tls_session);
 686                 }
 687                 return RLM_MODULE_HANDLED;
 688
 689         case PEAP_STATUS_INNER_IDENTITY_REQ_SENT:
 690                 /* we're expecting an identity response */
 691                 if (data[0] != PW_EAP_IDENTITY) {
 692                         RDEBUG("Expected EAP-Identity, got something else.");
 693                         return RLM_MODULE_REJECT;
 694                 }
 695
 696                 if (data_len >= sizeof(t->username->vp_strvalue)) {
 697                         RDEBUG("EAP-Identity is too long");
 698                         return RLM_MODULE_REJECT;
 699                 }
 700
 701                 /*
 702                  *      Save it for later.
 703                  */
 704                 t->username = pairmake("User-Name", "", T_OP_EQ);
 705                 rad_assert(t->username != NULL);
 706
 707                 memcpy(t->username->vp_strvalue, data + 1, data_len - 1);
 708                 t->username->length = data_len - 1;
 709                 t->username->vp_strvalue[t->username->length] = 0;
 710                 RDEBUG("Got inner identity '%s'", t->username->vp_strvalue);
 711
 712                 t->status = PEAP_STATUS_PHASE2_INIT;
 713                 break;
 714
 715         /*
 716          *      If we authenticated the user, then it's OK.
 717          */
 718         case PEAP_STATUS_SENT_TLV_SUCCESS:
 719                 if (eappeap_check_tlv(request, data)) {
 720                         RDEBUG2("Success");
 721                         return RLM_MODULE_OK;
 722                 }
 723
 724                 /*
 725                  *      Otherwise, the client rejected the session
 726                  *      resumption.  If the session is being re-used,
 727                  *      we need to do a full authentication.
 728                  *
 729                  *      We do this by sending an EAP-Identity request
 730                  *      inside of the PEAP tunnel.
 731                  */
 732                 if (t->session_resumption_state == PEAP_RESUMPTION_YES) {
 733                         RDEBUG2("Client rejected session resumption.  Re-starting full authentication");
 734
 735                         /*
 736                          *      Mark session resumption status.
 737                          */
 738                         t->status = PEAP_STATUS_INNER_IDENTITY_REQ_SENT;
 739                         t->session_resumption_state = PEAP_RESUMPTION_NO;
 740
 741                         eappeap_identity(handler, tls_session);
 742                         return RLM_MODULE_HANDLED;
 743                 }
 744
 745                 RDEBUG2("We sent a success, but received something weird in return.");
 746                 return RLM_MODULE_REJECT;
 747
 748         /*
 749          *      Damned if I know why the clients continue sending EAP
 750          *      packets after we told them to f*ck off.
 751          */
 752         case PEAP_STATUS_SENT_TLV_FAILURE:
 753                 RDEBUG(" The users session was previously rejected: returning reject (again.)");
 754                 RDEBUG(" *** This means you need to read the PREVIOUS messages in the debug output");
 755                 RDEBUG(" *** to find out the reason why the user was rejected.");
 756                 RDEBUG(" *** Look for \"reject\" or \"fail\".  Those earlier messages will tell you.");
 757                 RDEBUG(" *** what went wrong, and how to fix the problem.");
 758                 return RLM_MODULE_REJECT;
 759
 760                 case PEAP_STATUS_PHASE2_INIT:
 761                         RDEBUG("In state machine in phase2 init?");
 762
 763                 case PEAP_STATUS_PHASE2:
 764                         break;
 765
 766                 default:
 767                         RDEBUG2("Unhandled state in peap");
 768                         return RLM_MODULE_REJECT;
 769         }
 770
 771         fake = request_alloc_fake(request);
 772
 773         rad_assert(fake->packet->vps == NULL);
 774
 775         switch (t->status) {
 776                 /*
 777                  *      If we're in PHASE2_INIT, the phase2 method hasn't been
 778                  *      sent an Identity packet yet; do so from the stored
 779                  *      username and this will kick off the phase2 eap method
 780                  */
 781
 782         case PEAP_STATUS_PHASE2_INIT: {
 783                 int len = t->username->length + EAP_HEADER_LEN + 1;
 784
 785                 t->status = PEAP_STATUS_PHASE2;
 786
 787                 vp = paircreate(PW_EAP_MESSAGE, 0, PW_TYPE_OCTETS);
 788
 789                 vp->vp_octets[0] = PW_EAP_RESPONSE;
 790                 vp->vp_octets[1] = eap_ds->response->id;
 791                 vp->vp_octets[2] = (len >> 8) & 0xff;
 792                 vp->vp_octets[3] = len & 0xff;
 793                 vp->vp_octets[4] = PW_EAP_IDENTITY;
 794
 795                 memcpy(vp->vp_octets + EAP_HEADER_LEN + 1, t->username->vp_strvalue, t->username->length);
 796                 vp->length = len;
 797
 798                 pairadd(&fake->packet->vps, vp);
 799
 800                 if (t->default_eap_type != 0) {
 801                         RDEBUG2("Setting default EAP type for tunneled EAP session.");
 802                         vp = pairmake("EAP-Type", "0", T_OP_EQ);
 803                         vp->vp_integer = t->default_eap_type;
 804                         pairadd(&fake->config_items, vp);
 805                 }
 806                 break; }
 807
 808         case PEAP_STATUS_PHASE2:
 809                 fake->packet->vps = eap2vp(request, eap_ds, data, data_len);
 810                 if (!fake->packet->vps) {
 811                         request_free(&fake);
 812                         RDEBUG2("Unable to convert tunneled EAP packet to internal server data structures");
 813                         return PW_AUTHENTICATION_REJECT;
 814                 }
 815                 break;
 816
 817         default:
 818                 RDEBUG("Invalid state change in PEAP.");
 819                 return PW_AUTHENTICATION_REJECT;
 820         }
 821
 822         if ((debug_flag > 0) && fr_log_fp) {
 823                 RDEBUG("Got tunneled request");
 824
 825                 debug_pair_list(fake->packet->vps);
 826
 827                 fprintf(fr_log_fp, "server %s {\n",
 828                         (fake->server == NULL) ? "" : fake->server);
 829         }
 830
 831         /*
 832          *      Tell the request that it's a fake one.
 833          */
 834         vp = pairmake("Freeradius-Proxied-To", "127.0.0.1", T_OP_EQ);
 835         if (vp) {
 836                 pairadd(&fake->packet->vps, vp);
 837         }
 838
 839         /*
 840          *      Update other items in the REQUEST data structure.
 841          */
 842         if (!t->username) {
 843                 /*
 844                  *      There's no User-Name in the tunneled session,
 845                  *      so we add one here, by pulling it out of the
 846                  *      EAP-Identity packet.
 847                  */
 848                 if ((data[0] == PW_EAP_IDENTITY) && (data_len > 1)) {
 849                         t->username = pairmake("User-Name", "", T_OP_EQ);
 850                         rad_assert(t->username != NULL);
 851
 852                         memcpy(t->username->vp_strvalue, data + 1, data_len - 1);
 853                         t->username->length = data_len - 1;
 854                         t->username->vp_strvalue[t->username->length] = 0;
 855                         DEBUG2("  PEAP: Got tunneled identity of %s", t->username->vp_strvalue);
 856
 857                         /*
 858                          *      If there's a default EAP type,
 859                          *      set it here.
 860                          */
 861                         if (t->default_eap_type != 0) {
 862                                 DEBUG2("  PEAP: Setting default EAP type for tunneled EAP session.");
 863                                 vp = pairmake("EAP-Type", "0", T_OP_EQ);
 864                                 vp->vp_integer = t->default_eap_type;
 865                                 pairadd(&fake->config_items, vp);
 866                         }
 867                 }
 868         } /* else there WAS a t->username */
 869
 870         if (t->username) {
 871                 vp = paircopy(t->username);
 872                 pairadd(&fake->packet->vps, vp);
 873                 fake->username = pairfind(fake->packet->vps, PW_USER_NAME, 0);
 874                 DEBUG2("  PEAP: Setting User-Name to %s",
 875                        fake->username->vp_strvalue);
 876         }
 877
 878         /*
 879          *      Add the State attribute, too, if it exists.
 880          */
 881         if (t->state) {
 882                 vp = paircopy(t->state);
 883                 if (vp) pairadd(&fake->packet->vps, vp);
 884         }
 885
 886         /*
 887          *      If this is set, we copy SOME of the request attributes
 888          *      from outside of the tunnel to inside of the tunnel.
 889          *
 890          *      We copy ONLY those attributes which do NOT already
 891          *      exist in the tunneled request.
 892          *
 893          *      This code is copied from ../rlm_eap_ttls/ttls.c
 894          */
 895         if (t->copy_request_to_tunnel) {
 896                 VALUE_PAIR *copy;
 897
 898                 for (vp = request->packet->vps; vp != NULL; vp = vp->next) {
 899                         /*
 900                          *      The attribute is a server-side thingy,
 901                          *      don't copy it.
 902                          */
 903                         if ((vp->attribute > 255) &&
 904                             (vp->vendor == 0)) {
 905                                 continue;
 906                         }
 907
 908                         /*
 909                          *      The outside attribute is already in the
 910                          *      tunnel, don't copy it.
 911                          *
 912                          *      This works for BOTH attributes which
 913                          *      are originally in the tunneled request,
 914                          *      AND attributes which are copied there
 915                          *      from below.
 916                          */
 917                         if (pairfind(fake->packet->vps, vp->attribute, vp->vendor)) {
 918                                 continue;
 919                         }
 920
 921                         /*
 922                          *      Some attributes are handled specially.
 923                          */
 924                         switch (vp->attribute) {
 925                                 /*
 926                                  *      NEVER copy Message-Authenticator,
 927                                  *      EAP-Message, or State.  They're
 928                                  *      only for outside of the tunnel.
 929                                  */
 930                         case PW_USER_NAME:
 931                         case PW_USER_PASSWORD:
 932                         case PW_CHAP_PASSWORD:
 933                         case PW_CHAP_CHALLENGE:
 934                         case PW_PROXY_STATE:
 935                         case PW_MESSAGE_AUTHENTICATOR:
 936                         case PW_EAP_MESSAGE:
 937                         case PW_STATE:
 938                                 continue;
 939                                 break;
 940
 941                                 /*
 942                                  *      By default, copy it over.
 943                                  */
 944                         default:
 945                                 break;
 946                         }
 947
 948                         /*
 949                          *      Don't copy from the head, we've already
 950                          *      checked it.
 951                          */
 952                         copy = paircopy2(vp, vp->attribute, vp->vendor);
 953                         pairadd(&fake->packet->vps, copy);
 954                 }
 955         }
 956
 957         if ((vp = pairfind(request->config_items, PW_VIRTUAL_SERVER, 0)) != NULL) {
 958                 fake->server = vp->vp_strvalue;
 959
 960         } else if (t->virtual_server) {
 961                 fake->server = t->virtual_server;
 962
 963         } /* else fake->server == request->server */
 964
 965         if ((debug_flag > 0) && fr_log_fp) {
 966                 fprintf(fr_log_fp, "Sending tunneled request\n");
 967
 968                 debug_pair_list(fake->packet->vps);
 969
 970                 fprintf(fr_log_fp, "server %s {\n",
 971                         (fake->server == NULL) ? "" : fake->server);
 972         }
 973
 974         /*
 975          *      Call authentication recursively, which will
 976          *      do PAP, CHAP, MS-CHAP, etc.
 977          */
 978         rad_authenticate(fake);
 979
 980         /*
 981          *      Note that we don't do *anything* with the reply
 982          *      attributes.
 983          */
 984         if ((debug_flag > 0) && fr_log_fp) {
 985                 fprintf(fr_log_fp, "} # server %s\n",
 986                         (fake->server == NULL) ? "" : fake->server);
 987
 988                 RDEBUG("Got tunneled reply code %d", fake->reply->code);
 989
 990                 debug_pair_list(fake->reply->vps);
 991         }
 992
 993         /*
 994          *      Decide what to do with the reply.
 995          */
 996         switch (fake->reply->code) {
 997         case 0:                 /* No reply code, must be proxied... */
 998 #ifdef WITH_PROXY
 999                 vp = pairfind(fake->config_items, PW_PROXY_TO_REALM, 0);
1000
1001                 if (vp) {
1002                         eap_tunnel_data_t *tunnel;
1003
1004                         /*
1005                          *      The tunneled request was NOT handled,
1006                          *      it has to be proxied.  This means that
1007                          *      the "authenticate" stage was never
1008                          *      performed.
1009                          *
1010                          *      If we are told to NOT proxy the
1011                          *      tunneled request as EAP, then this
1012                          *      means that we've got to decode it,
1013                          *      which means that we MUST run the
1014                          *      "authenticate" portion by hand, here.
1015                          *
1016                          *      Once the tunneled EAP session is ALMOST
1017                          *      done, THEN we proxy it...
1018                          */
1019                         if (!t->proxy_tunneled_request_as_eap) {
1020                                 fake->options |= RAD_REQUEST_OPTION_PROXY_EAP;
1021
1022                                 /*
1023                                  *      Hmm... should we check for
1024                                  *      Auth-Type & EAP-Message here?
1025                                  */
1026
1027
1028                                 /*
1029                                  *      Run the EAP authentication.
1030                                  */
1031                                 DEBUG2("  PEAP: Calling authenticate in order to initiate tunneled EAP session.");
1032                                 rcode = module_authenticate(PW_AUTHTYPE_EAP, fake);
1033                                 if (rcode == RLM_MODULE_OK) {
1034                                         /*
1035                                          *      Authentication succeeded! Rah!
1036                                          */
1037                                         fake->reply->code = PW_AUTHENTICATION_ACK;
1038                                         goto do_process;
1039                                 }
1040
1041                                 if (rcode != RLM_MODULE_HANDLED) {
1042                                         DEBUG2("  PEAP: Can't handle the return code %d", rcode);
1043                                         rcode = RLM_MODULE_REJECT;
1044                                         goto done;
1045                                 }
1046
1047                                 /*
1048                                  *      The module decided it wasn't
1049                                  *      done.  Handle it like normal.
1050                                  */
1051                                 if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) == 0) {
1052                                         DEBUG2("    PEAP: Cancelling proxy to realm %s until the tunneled EAP session has been established", vp->vp_strvalue);
1053                                         goto do_process;
1054                                 }
1055
1056                                 /*
1057                                  *      The module has decoded the
1058                                  *      EAP-Message into another set
1059                                  *      of attributes.
1060                                  */
1061                                 pairdelete(&fake->packet->vps,
1062                                            PW_EAP_MESSAGE, 0);
1063                         }
1064
1065                         DEBUG2("  PEAP: Tunneled authentication will be proxied to %s", vp->vp_strvalue);
1066
1067                         /*
1068                          *      Tell the original request that it's going
1069                          *      to be proxied.
1070                          */
1071                         pairmove2(&(request->config_items),
1072                                   &(fake->config_items),
1073                                   PW_PROXY_TO_REALM, 0);
1074
1075                         /*
1076                          *      Seed the proxy packet with the
1077                          *      tunneled request.
1078                          */
1079                         rad_assert(request->proxy == NULL);
1080                         request->proxy = fake->packet;
1081                         memset(&request->proxy->src_ipaddr, 0,
1082                                sizeof(request->proxy->src_ipaddr));
1083                         memset(&request->proxy->src_ipaddr, 0,
1084                                sizeof(request->proxy->src_ipaddr));
1085                         request->proxy->src_port = 0;
1086                         request->proxy->dst_port = 0;
1087                         fake->packet = NULL;
1088                         rad_free(&fake->reply);
1089                         fake->reply = NULL;
1090
1091                         /*
1092                          *      Set up the callbacks for the tunnel
1093                          */
1094                         tunnel = rad_malloc(sizeof(*tunnel));
1095                         memset(tunnel, 0, sizeof(*tunnel));
1096
1097                         tunnel->tls_session = tls_session;
1098                         tunnel->callback = eappeap_postproxy;
1099
1100                         /*
1101                          *      Associate the callback with the request.
1102                          */
1103                         rcode = request_data_add(request,
1104                                                  request->proxy,
1105                                                  REQUEST_DATA_EAP_TUNNEL_CALLBACK,
1106                                                  tunnel, free);
1107                         rad_assert(rcode == 0);
1108
1109                         /*
1110                          *      We're not proxying it as EAP, so we've got
1111                          *      to do the callback later.
1112                          */
1113                         if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) != 0) {
1114                                 DEBUG2("  PEAP: Remembering to do EAP-MS-CHAP-V2 post-proxy.");
1115
1116                                 /*
1117                                  *      rlm_eap.c has taken care of associating
1118                                  *      the handler with the fake request.
1119                                  *
1120                                  *      So we associate the fake request with
1121                                  *      this request.
1122                                  */
1123                                 rcode = request_data_add(request,
1124                                                          request->proxy,
1125                                                          REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK,
1126                                                          fake, my_request_free);
1127                                 rad_assert(rcode == 0);
1128
1129                                 /*
1130                                  *      Do NOT free the fake request!
1131                                  */
1132                                 return RLM_MODULE_UPDATED;
1133                         }
1134
1135                         /*
1136                          *      Didn't authenticate the packet, but
1137                          *      we're proxying it.
1138                          */
1139                         rcode = RLM_MODULE_UPDATED;
1140
1141                 } else
1142 #endif  /* WITH_PROXY */
1143                   {
1144                         DEBUG2("  PEAP: Unknown RADIUS packet type %d: rejecting tunneled user", fake->reply->code);
1145                         rcode = RLM_MODULE_REJECT;
1146                   }
1147                 break;
1148
1149         default:
1150         do_process:
1151                 rcode = process_reply(handler, tls_session, request,
1152                                       fake->reply);
1153                 break;
1154         }
1155
1156  done:
1157         request_free(&fake);
1158
1159         return rcode;
1160 }