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

   1 /*
   2  * peap.c  contains the interfaces that are called from eap
   3  *
   4  * Version:     $Id$
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  *   Copyright 2003 Alan DeKok <aland@freeradius.org>
  21  *   Copyright 2006 The FreeRADIUS server project
  22  */
  23
  24 #include <freeradius-devel/ident.h>
  25 RCSID("$Id$")
  26
  27 #include "eap_peap.h"
  28
  29 /*
  30  *      Send protected EAP-Failure
  31  *
  32  *       Result-TLV = Failure
  33  */
  34 static int eappeap_failure(EAP_HANDLER *handler, tls_session_t *tls_session)
  35 {
  36         uint8_t tlv_packet[11];
  37
  38         DEBUG2("  rlm_eap_peap: FAILURE");
  39
  40         tlv_packet[0] = PW_EAP_REQUEST;
  41         tlv_packet[1] = handler->eap_ds->response->id +1;
  42         tlv_packet[2] = 0;
  43         tlv_packet[3] = 11;     /* length of this packet */
  44         tlv_packet[4] = PW_EAP_TLV;
  45         tlv_packet[5] = 0x80;
  46         tlv_packet[6] = EAP_TLV_ACK_RESULT;
  47         tlv_packet[7] = 0;
  48         tlv_packet[8] = 2;      /* length of the data portion */
  49         tlv_packet[9] = 0;
  50         tlv_packet[10] = EAP_TLV_FAILURE;
  51
  52         (tls_session->record_plus)(&tls_session->clean_in, tlv_packet, 11);
  53
  54         /*
  55          *      FIXME: Check the return code.
  56          */
  57         tls_handshake_send(tls_session);
  58
  59         return 1;
  60 }
  61
  62
  63 /*
  64  *      Send protected EAP-Success
  65  *
  66  *       Result-TLV = Success
  67  */
  68 static int eappeap_success(EAP_HANDLER *handler, tls_session_t *tls_session)
  69 {
  70         uint8_t tlv_packet[11];
  71
  72         DEBUG2("  rlm_eap_peap: SUCCESS");
  73
  74         tlv_packet[0] = PW_EAP_REQUEST;
  75         tlv_packet[1] = handler->eap_ds->response->id +1;
  76         tlv_packet[2] = 0;
  77         tlv_packet[3] = 11;     /* length of this packet */
  78         tlv_packet[4] = PW_EAP_TLV;
  79         tlv_packet[5] = 0x80;   /* mandatory AVP */
  80         tlv_packet[6] = EAP_TLV_ACK_RESULT;
  81         tlv_packet[7] = 0;
  82         tlv_packet[8] = 2;      /* length of the data portion */
  83         tlv_packet[9] = 0;
  84         tlv_packet[10] = EAP_TLV_SUCCESS;
  85
  86         (tls_session->record_plus)(&tls_session->clean_in, tlv_packet, 11);
  87
  88         /*
  89          *      FIXME: Check the return code.
  90          */
  91         tls_handshake_send(tls_session);
  92
  93         return 1;
  94 }
  95
  96
  97 /*
  98  *      Verify the tunneled EAP message.
  99  */
 100 static int eapmessage_verify(const uint8_t *data, unsigned int data_len)
 101 {
 102         const eap_packet_t *eap_packet = (const eap_packet_t *) data;
 103         uint8_t eap_type;
 104         char buffer[256];
 105
 106         if (!data || (data_len <= 1)) {
 107                 return 0;
 108         }
 109
 110         eap_type = *data;
 111         switch (eap_type) {
 112         case PW_EAP_IDENTITY:
 113                 DEBUG2("  rlm_eap_peap: Identity - %*s",
 114                        data_len - 1, data + 1);
 115                 return 1;
 116                 break;
 117
 118                 /*
 119                  *      If the first byte of the packet is
 120                  *      EAP-Response, and the EAP data is a TLV,
 121                  *      then it looks OK...
 122                  */
 123         case PW_EAP_RESPONSE:
 124                 if (eap_packet->data[0] == PW_EAP_TLV) {
 125                         DEBUG2("  rlm_eap_peap: Received EAP-TLV response.");
 126                         return 1;
 127                 }
 128                 DEBUG2("  rlm_eap_peap: Got something weird.");
 129                 break;
 130
 131
 132                 /*
 133                  *      We normally do Microsoft MS-CHAPv2 (26), versus
 134                  *      Cisco MS-CHAPv2 (29).
 135                  */
 136         case PW_EAP_MSCHAPV2:
 137         default:
 138                 DEBUG2("  rlm_eap_peap: EAP type %s",
 139                        eaptype_type2name(eap_type,
 140                                          buffer, sizeof(buffer)));
 141                 return 1;
 142                 break;
 143         }
 144
 145         return 0;
 146 }
 147
 148 /*
 149  *      Convert a pseudo-EAP packet to a list of VALUE_PAIR's.
 150  */
 151 static VALUE_PAIR *eap2vp(EAP_DS *eap_ds,
 152                           const uint8_t *data, size_t data_len)
 153 {
 154         size_t total;
 155         VALUE_PAIR *vp = NULL, *head, **tail;
 156
 157         if (data_len > 65535) return NULL; /* paranoia */
 158
 159         vp = paircreate(PW_EAP_MESSAGE, PW_TYPE_OCTETS);
 160         if (!vp) {
 161                 DEBUG2("  rlm_eap_peap: Failure in creating VP");
 162                 return NULL;
 163         }
 164
 165         total = data_len;
 166         if (total > 249) total = 249;
 167
 168         /*
 169          *      Hand-build an EAP packet from the crap in PEAP version 0.
 170          */
 171         vp->vp_octets[0] = PW_EAP_RESPONSE;
 172         vp->vp_octets[1] = eap_ds->response->id;
 173         vp->vp_octets[2] = (data_len + EAP_HEADER_LEN) >> 8;
 174         vp->vp_octets[3] = (data_len + EAP_HEADER_LEN) & 0xff;
 175
 176         memcpy(vp->vp_octets + EAP_HEADER_LEN, data, total);
 177         vp->length = EAP_HEADER_LEN + total;
 178
 179         head = vp;
 180         tail = &(vp->next);
 181         while (total < data_len) {
 182                 int vp_len;
 183
 184
 185                 vp = paircreate(PW_EAP_MESSAGE, PW_TYPE_OCTETS);
 186                 if (!vp) {
 187                         DEBUG2("  rlm_eap_peap: Failure in creating VP");
 188                         pairfree(&head);
 189                         return NULL;
 190                 }
 191                 vp_len = (data_len - total);
 192                 if (vp_len > 253) vp_len = 253;
 193
 194                 memcpy(vp->vp_octets, data + total, vp_len);
 195                 vp->length = vp_len;
 196
 197                 total += vp_len;
 198                 *tail = vp;
 199                 tail = &(vp->next);
 200         }
 201
 202         return head;
 203 }
 204
 205
 206 /*
 207  *      Convert a list of VALUE_PAIR's to an EAP packet, through the
 208  *      simple expedient of dumping the EAP message
 209  */
 210 static int vp2eap(tls_session_t *tls_session, VALUE_PAIR *vp)
 211 {
 212         /*
 213          *      Skip the id, code, and length.  Just write the EAP
 214          *      type & data to the client.
 215          */
 216 #ifndef NDEBUG
 217         if (debug_flag > 2) {
 218                 size_t i, total;
 219                 VALUE_PAIR *this;
 220
 221                 total = 0;
 222
 223                 for (this = vp; this != NULL; this = this->next) {
 224                         int start = 0;
 225
 226                         if (this == vp) start = EAP_HEADER_LEN;
 227
 228                         for (i = start; i < vp->length; i++) {
 229                                 if ((total & 0x0f) == 0) printf("  PEAP tunnel data out %04x: ", total);
 230
 231                                 printf("%02x ", vp->vp_octets[i]);
 232
 233                                 if ((total & 0x0f) == 0x0f) printf("\n");
 234                                 total++;
 235                         }
 236                 }
 237                 if ((total & 0x0f) != 0) printf("\n");
 238         }
 239 #endif
 240
 241         /*
 242          *      Send the EAP data, WITHOUT the header.
 243          */
 244         (tls_session->record_plus)(&tls_session->clean_in,
 245                                    vp->vp_octets + EAP_HEADER_LEN,
 246                                    vp->length - EAP_HEADER_LEN);
 247
 248         /*
 249          *      Send the rest of the EAP data.
 250          */
 251         for (vp = vp->next; vp != NULL; vp = vp->next) {
 252                 (tls_session->record_plus)(&tls_session->clean_in,
 253                                            vp->vp_octets, vp->length);
 254         }
 255
 256         tls_handshake_send(tls_session);
 257
 258         return 1;
 259 }
 260
 261
 262 /*
 263  *      See if there's a TLV in the response.
 264  */
 265 static int eappeap_check_tlv(const uint8_t *data)
 266 {
 267         const eap_packet_t *eap_packet = (const eap_packet_t *) data;
 268
 269         /*
 270          *      Look for success or failure.
 271          */
 272         if ((eap_packet->code == PW_EAP_RESPONSE) &&
 273             (eap_packet->data[0] == PW_EAP_TLV)) {
 274                 if (data[10] == EAP_TLV_SUCCESS) {
 275                         return 1;
 276                 }
 277
 278                 if (data[10] == EAP_TLV_FAILURE) {
 279                         DEBUG2("  rlm_eap_peap: Client rejected our response.  The password is probably incorrect.");
 280                         return 0;
 281                 }
 282         }
 283
 284         return 0;
 285 }
 286
 287
 288 /*
 289  *      Use a reply packet to determine what to do.
 290  */
 291 static int process_reply(EAP_HANDLER *handler, tls_session_t *tls_session,
 292                          UNUSED REQUEST *request, RADIUS_PACKET *reply)
 293 {
 294         int rcode = RLM_MODULE_REJECT;
 295         VALUE_PAIR *vp;
 296         peap_tunnel_t *t = tls_session->opaque;
 297
 298 #ifndef NDEBUG
 299         if (debug_flag > 0) {
 300                 printf("  PEAP: Processing from tunneled session code %p %d\n",
 301                        reply, reply->code);
 302
 303                 for (vp = reply->vps; vp != NULL; vp = vp->next) {
 304                         putchar('\t');vp_print(stdout, vp);putchar('\n');
 305                 }
 306         }
 307 #endif
 308
 309         switch (reply->code) {
 310         case PW_AUTHENTICATION_ACK:
 311                 DEBUG2("  PEAP: Tunneled authentication was successful.");
 312                 t->status = PEAP_STATUS_SENT_TLV_SUCCESS;
 313                 eappeap_success(handler, tls_session);
 314                 rcode = RLM_MODULE_HANDLED;
 315
 316                 /*
 317                  *      If we've been told to use the attributes from
 318                  *      the reply, then do so.
 319                  *
 320                  *      WARNING: This may leak information about the
 321                  *      tunneled user!
 322                  */
 323                 if (t->use_tunneled_reply) {
 324                         DEBUG2("  Saving tunneled attributes for later");
 325
 326                         /*
 327                          *      Clean up the tunneled reply.
 328                          */
 329                         pairdelete(&reply->vps, PW_PROXY_STATE);
 330                         pairdelete(&reply->vps, PW_EAP_MESSAGE);
 331                         pairdelete(&reply->vps, PW_MESSAGE_AUTHENTICATOR);
 332
 333                         t->accept_vps = reply->vps;
 334                         reply->vps = NULL;
 335                 }
 336                 break;
 337
 338         case PW_AUTHENTICATION_REJECT:
 339                 DEBUG2("  PEAP: Tunneled authentication was rejected.");
 340                 t->status = PEAP_STATUS_SENT_TLV_FAILURE;
 341                 eappeap_failure(handler, tls_session);
 342                 rcode = RLM_MODULE_HANDLED;
 343                 break;
 344
 345         case PW_ACCESS_CHALLENGE:
 346                 DEBUG2("  PEAP: Got tunneled Access-Challenge");
 347
 348                 /*
 349                  *      Keep the State attribute, if necessary.
 350                  *
 351                  *      Get rid of the old State, too.
 352                  */
 353                 pairfree(&t->state);
 354                 pairmove2(&t->state, &(reply->vps), PW_STATE);
 355
 356                 /*
 357                  *      PEAP takes only EAP-Message attributes inside
 358                  *      of the tunnel.  Any Reply-Message in the
 359                  *      Access-Challenge is ignored.
 360                  */
 361                 vp = NULL;
 362                 pairmove2(&vp, &(reply->vps), PW_EAP_MESSAGE);
 363
 364                 /*
 365                  *      Handle EAP-MSCHAP-V2, where Access-Accept's
 366                  *      from the home server may contain MS-CHAP-Success,
 367                  *      which the module turns into challenges, so that
 368                  *      the client may respond to the challenge with
 369                  *      an "ack" packet.
 370                  */
 371                 if (t->home_access_accept && t->use_tunneled_reply) {
 372                         DEBUG2("  Saving tunneled attributes for later");
 373
 374                         /*
 375                          *      Clean up the tunneled reply.
 376                          */
 377                         pairdelete(&reply->vps, PW_PROXY_STATE);
 378                         pairdelete(&reply->vps, PW_MESSAGE_AUTHENTICATOR);
 379
 380                         t->accept_vps = reply->vps;
 381                         reply->vps = NULL;
 382                 }
 383
 384                 /*
 385                  *      Handle the ACK, by tunneling any necessary reply
 386                  *      VP's back to the client.
 387                  */
 388                 if (vp) {
 389                         vp2eap(tls_session, vp);
 390                         pairfree(&vp);
 391                 }
 392
 393                 rcode = RLM_MODULE_HANDLED;
 394                 break;
 395
 396         default:
 397                 DEBUG2("  PEAP: Unknown RADIUS packet type %d: rejecting tunneled user", reply->code);
 398                 rcode = RLM_MODULE_REJECT;
 399                 break;
 400         }
 401
 402         return rcode;
 403 }
 404
 405
 406 /*
 407  *      Do post-proxy processing,
 408  */
 409 static int eappeap_postproxy(EAP_HANDLER *handler, void *data)
 410 {
 411         int rcode;
 412         tls_session_t *tls_session = (tls_session_t *) data;
 413         REQUEST *fake;
 414
 415         DEBUG2("  PEAP: Passing reply from proxy back into the tunnel.");
 416
 417         /*
 418          *      If there was a fake request associated with the proxied
 419          *      request, do more processing of it.
 420          */
 421         fake = (REQUEST *) request_data_get(handler->request,
 422                                             handler->request->proxy,
 423                                             REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK);
 424
 425         /*
 426          *      Do the callback, if it exists, and if it was a success.
 427          */
 428         if (fake && (handler->request->proxy_reply->code == PW_AUTHENTICATION_ACK)) {
 429                 VALUE_PAIR *vp;
 430                 REQUEST *request = handler->request;
 431                 peap_tunnel_t *t = tls_session->opaque;
 432
 433                 t->home_access_accept = TRUE;
 434
 435                 /*
 436                  *      Terrible hacks.
 437                  */
 438                 rad_assert(fake->packet == NULL);
 439                 fake->packet = request->proxy;
 440                 request->proxy = NULL;
 441
 442                 rad_assert(fake->reply == NULL);
 443                 fake->reply = request->proxy_reply;
 444                 request->proxy_reply = NULL;
 445
 446                 /*
 447                  *      Perform a post-auth stage, which will get the EAP
 448                  *      handler, too...
 449                  */
 450                 fake->options &= ~RAD_REQUEST_OPTION_PROXY_EAP;
 451                 DEBUG2("  PEAP: Passing reply back for EAP-MS-CHAP-V2 %p %d",
 452                        fake, fake->reply->code);
 453                 rcode = module_post_proxy(0, fake);
 454
 455                 /*
 456                  *      FIXME: If rcode returns fail, do something
 457                  *      intelligent...
 458                  */
 459                 DEBUG2("  POST-PROXY %d", rcode);
 460                 rcode = rad_postauth(fake);
 461                 DEBUG2("  POST-AUTH %d", rcode);
 462
 463 #ifndef NDEBUG
 464                 if (debug_flag > 0) {
 465                         printf("  PEAP: Final reply from tunneled session code %d\n",
 466                                fake->reply->code);
 467
 468                         for (vp = fake->reply->vps; vp != NULL; vp = vp->next) {
 469                                 putchar('\t');vp_print(stdout, vp);putchar('\n');
 470                         }
 471                 }
 472 #endif
 473
 474                 /*
 475                  *      Terrible hacks.
 476                  */
 477                 request->proxy = fake->packet;
 478                 fake->packet = NULL;
 479                 request->proxy_reply = fake->reply;
 480                 fake->reply = NULL;
 481
 482                 /*
 483                  *      And we're done with this request.
 484                  */
 485
 486                 switch (rcode) {
 487                 case RLM_MODULE_FAIL:
 488                         request_free(&fake);
 489                         eaptls_fail(handler->eap_ds, 0);
 490                         return 0;
 491                         break;
 492
 493                 default:  /* Don't Do Anything */
 494                         DEBUG2(" PEAP: Got reply %d",
 495                                request->proxy_reply->code);
 496                         break;
 497                 }
 498         }
 499         request_free(&fake);    /* robust if fake == NULL */
 500
 501         /*
 502          *      If there was no EAP-Message in the reply packet, then
 503          *      we know that we're supposed to re-run the "authenticate"
 504          *      stage, in order to get the right kind of handling...
 505          */
 506
 507         /*
 508          *      Process the reply from the home server.
 509          */
 510
 511         rcode = process_reply(handler, tls_session, handler->request,
 512                               handler->request->proxy_reply);
 513
 514         /*
 515          *      The proxy code uses the reply from the home server as
 516          *      the basis for the reply to the NAS.  We don't want that,
 517          *      so we toss it, after we've had our way with it.
 518          */
 519         pairfree(&handler->request->proxy_reply->vps);
 520
 521         switch (rcode) {
 522         case RLM_MODULE_REJECT:
 523                 DEBUG2("  PEAP: Reply was rejected");
 524                 eaptls_fail(handler->eap_ds, 0);
 525                 return 0;
 526
 527         case RLM_MODULE_HANDLED:
 528                 DEBUG2("  PEAP: Reply was handled");
 529                 eaptls_request(handler->eap_ds, tls_session);
 530                 return 1;
 531
 532         case RLM_MODULE_OK:
 533                 DEBUG2("  PEAP: Reply was OK");
 534                 eaptls_success(handler->eap_ds, 0);
 535                 eaptls_gen_mppe_keys(&handler->request->reply->vps,
 536                                      tls_session->ssl,
 537                                      "client EAP encryption");
 538                 return 1;
 539
 540         default:
 541                 DEBUG2("  PEAP: Reply was unknown.");
 542                 break;
 543         }
 544
 545         eaptls_fail(handler->eap_ds, 0);
 546         return 0;
 547 }
 548
 549 /*
 550  *      Free a request.
 551  */
 552 static void my_request_free(void *data)
 553 {
 554         REQUEST *request = (REQUEST *)data;
 555
 556         request_free(&request);
 557 }
 558
 559
 560 /*
 561  *      Process the pseudo-EAP contents of the tunneled data.
 562  */
 563 int eappeap_process(EAP_HANDLER *handler, tls_session_t *tls_session)
 564 {
 565         int err;
 566         peap_tunnel_t *t = tls_session->opaque;
 567         REQUEST *fake;
 568         VALUE_PAIR *vp;
 569         int rcode = RLM_MODULE_REJECT;
 570         const uint8_t   *data;
 571         unsigned int data_len;
 572 #ifndef NDEBUG
 573         size_t i;
 574 #endif
 575
 576         REQUEST *request = handler->request;
 577         EAP_DS *eap_ds = handler->eap_ds;
 578
 579         /*
 580          *      FIXME: if the SSL session says "want read", or
 581          *      similar, leave the data in the clean_out buffer.  This
 582          *      lets the application data be sent across multiple
 583          *      fragments.
 584          */
 585         err = tls_handshake_recv(tls_session);
 586         if (!err) {
 587                 DEBUG2(" rlm_eap_peap: Failed in SSL");
 588                 return RLM_MODULE_REJECT;
 589         }
 590
 591         /*
 592          *      Just look at the buffer directly, without doing
 593          *      record_minus.  This lets us avoid another data copy.
 594          */
 595         data_len = tls_session->clean_out.used;
 596         tls_session->clean_out.used = 0;
 597         data = tls_session->clean_out.data;
 598
 599 #ifndef NDEBUG
 600         if (debug_flag > 2) {
 601                 for (i = 0; i < data_len; i++) {
 602                         if ((i & 0x0f) == 0) printf("  PEAP tunnel data in %04x: ", i);
 603
 604                         printf("%02x ", data[i]);
 605
 606                         if ((i & 0x0f) == 0x0f) printf("\n");
 607                 }
 608                 if ((data_len & 0x0f) != 0) printf("\n");
 609         }
 610 #endif
 611
 612         if (!eapmessage_verify(data, data_len)) {
 613                 DEBUG2("  rlm_eap_peap: Tunneled data is invalid.");
 614                 return RLM_MODULE_REJECT;
 615         }
 616
 617
 618         /*
 619          *      If we authenticated the user, then it's OK.
 620          */
 621         if (t->status == PEAP_STATUS_SENT_TLV_SUCCESS) {
 622                 if (eappeap_check_tlv(data)) {
 623                         DEBUG2("  rlm_eap_peap: Success");
 624                         return RLM_MODULE_OK;
 625                 }
 626
 627                 return RLM_MODULE_REJECT;
 628
 629         } else if (t->status == PEAP_STATUS_SENT_TLV_FAILURE) {
 630                 DEBUG2("  rlm_eap_peap:  Had sent TLV failure.  User was rejected earlier in this session.");
 631                 return RLM_MODULE_REJECT;
 632         }
 633
 634         fake = request_alloc_fake(request);
 635
 636         rad_assert(fake->packet->vps == NULL);
 637
 638         fake->packet->vps = eap2vp(eap_ds, data, data_len);
 639         if (!fake->packet->vps) {
 640                 request_free(&fake);
 641                 DEBUG2("  rlm_eap_peap: Unable to convert tunneled EAP packet to internal server data structures");
 642                 return PW_AUTHENTICATION_REJECT;
 643         }
 644
 645 #ifndef NDEBUG
 646         if (debug_flag > 0) {
 647           printf("  PEAP: Got tunneled EAP-Message\n");
 648
 649           for (vp = fake->packet->vps; vp != NULL; vp = vp->next) {
 650             putchar('\t');vp_print(stdout, vp);putchar('\n');
 651           }
 652         }
 653 #endif
 654
 655         /*
 656          *      Tell the request that it's a fake one.
 657          */
 658         vp = pairmake("Freeradius-Proxied-To", "127.0.0.1", T_OP_EQ);
 659         if (vp) {
 660                 pairadd(&fake->packet->vps, vp);
 661         }
 662
 663         /*
 664          *      Update other items in the REQUEST data structure.
 665          */
 666         if (!t->username) {
 667                 /*
 668                  *      There's no User-Name in the tunneled session,
 669                  *      so we add one here, by pulling it out of the
 670                  *      EAP-Identity packet.
 671                  */
 672                 if ((data[0] == PW_EAP_IDENTITY) && (data_len > 1)) {
 673                         t->username = pairmake("User-Name", "", T_OP_EQ);
 674                         rad_assert(t->username != NULL);
 675
 676                         memcpy(t->username->vp_strvalue, data + 1, data_len - 1);
 677                         t->username->length = data_len - 1;
 678                         t->username->vp_strvalue[t->username->length] = 0;
 679                         DEBUG2("  PEAP: Got tunneled identity of %s", t->username->vp_strvalue);
 680
 681                         /*
 682                          *      If there's a default EAP type,
 683                          *      set it here.
 684                          */
 685                         if (t->default_eap_type != 0) {
 686                                 DEBUG2("  PEAP: Setting default EAP type for tunneled EAP session.");
 687                                 vp = pairmake("EAP-Type", "0", T_OP_EQ);
 688                                 vp->vp_integer = t->default_eap_type;
 689                                 pairadd(&fake->config_items, vp);
 690                         }
 691                 }
 692         } /* else there WAS a t->username */
 693
 694         if (t->username) {
 695                 vp = paircopy(t->username);
 696                 pairadd(&fake->packet->vps, vp);
 697                 fake->username = pairfind(fake->packet->vps, PW_USER_NAME);
 698                 DEBUG2("  PEAP: Setting User-Name to %s",
 699                        fake->username->vp_strvalue);
 700         }
 701
 702         /*
 703          *      Add the State attribute, too, if it exists.
 704          */
 705         if (t->state) {
 706                 vp = paircopy(t->state);
 707                 if (vp) pairadd(&fake->packet->vps, vp);
 708         }
 709
 710         /*
 711          *      If this is set, we copy SOME of the request attributes
 712          *      from outside of the tunnel to inside of the tunnel.
 713          *
 714          *      We copy ONLY those attributes which do NOT already
 715          *      exist in the tunneled request.
 716          *
 717          *      This code is copied from ../rlm_eap_ttls/ttls.c
 718          */
 719         if (t->copy_request_to_tunnel) {
 720                 VALUE_PAIR *copy;
 721
 722                 for (vp = request->packet->vps; vp != NULL; vp = vp->next) {
 723                         /*
 724                          *      The attribute is a server-side thingy,
 725                          *      don't copy it.
 726                          */
 727                         if ((vp->attribute > 255) &&
 728                             (((vp->attribute >> 16) & 0xffff) == 0)) {
 729                                 continue;
 730                         }
 731
 732                         /*
 733                          *      The outside attribute is already in the
 734                          *      tunnel, don't copy it.
 735                          *
 736                          *      This works for BOTH attributes which
 737                          *      are originally in the tunneled request,
 738                          *      AND attributes which are copied there
 739                          *      from below.
 740                          */
 741                         if (pairfind(fake->packet->vps, vp->attribute)) {
 742                                 continue;
 743                         }
 744
 745                         /*
 746                          *      Some attributes are handled specially.
 747                          */
 748                         switch (vp->attribute) {
 749                                 /*
 750                                  *      NEVER copy Message-Authenticator,
 751                                  *      EAP-Message, or State.  They're
 752                                  *      only for outside of the tunnel.
 753                                  */
 754                         case PW_USER_NAME:
 755                         case PW_USER_PASSWORD:
 756                         case PW_CHAP_PASSWORD:
 757                         case PW_CHAP_CHALLENGE:
 758                         case PW_PROXY_STATE:
 759                         case PW_MESSAGE_AUTHENTICATOR:
 760                         case PW_EAP_MESSAGE:
 761                         case PW_STATE:
 762                                 continue;
 763                                 break;
 764
 765                                 /*
 766                                  *      By default, copy it over.
 767                                  */
 768                         default:
 769                                 break;
 770                         }
 771
 772                         /*
 773                          *      Don't copy from the head, we've already
 774                          *      checked it.
 775                          */
 776                         copy = paircopy2(vp, vp->attribute);
 777                         pairadd(&fake->packet->vps, copy);
 778                 }
 779         }
 780
 781         if ((vp = pairfind(request->config_items, PW_VIRTUAL_SERVER)) != NULL) {
 782                 fake->server = vp->vp_strvalue;
 783
 784         } else if (t->virtual_server) {
 785                 fake->server = t->virtual_server;
 786
 787         } /* else fake->server == request->server */
 788
 789 #ifndef NDEBUG
 790         if (debug_flag > 0) {
 791                 printf("  PEAP: Sending tunneled request\n");
 792
 793                 for (vp = fake->packet->vps; vp != NULL; vp = vp->next) {
 794                         putchar('\t');vp_print(stdout, vp);putchar('\n');
 795                 }
 796
 797                 printf("server %s {\n", fake->server);
 798         }
 799 #endif
 800
 801         /*
 802          *      Call authentication recursively, which will
 803          *      do PAP, CHAP, MS-CHAP, etc.
 804          */
 805         rad_authenticate(fake);
 806
 807         /*
 808          *      Note that we don't do *anything* with the reply
 809          *      attributes.
 810          */
 811 #ifndef NDEBUG
 812         if (debug_flag > 0) {
 813                 printf("} # server %s\n", fake->server);
 814
 815                 printf("  PEAP: Got tunneled reply RADIUS code %d\n",
 816                  fake->reply->code);
 817
 818                 for (vp = fake->reply->vps; vp != NULL; vp = vp->next) {
 819                         putchar('\t');vp_print(stdout, vp);putchar('\n');
 820                 }
 821         }
 822 #endif
 823
 824         /*
 825          *      Decide what to do with the reply.
 826          */
 827         switch (fake->reply->code) {
 828         case 0:                 /* No reply code, must be proxied... */
 829                 vp = pairfind(fake->config_items, PW_PROXY_TO_REALM);
 830
 831                 if (vp) {
 832                         eap_tunnel_data_t *tunnel;
 833
 834                         /*
 835                          *      The tunneled request was NOT handled,
 836                          *      it has to be proxied.  This means that
 837                          *      the "authenticate" stage was never
 838                          *      performed.
 839                          *
 840                          *      If we are told to NOT proxy the
 841                          *      tunneled request as EAP, then this
 842                          *      means that we've got to decode it,
 843                          *      which means that we MUST run the
 844                          *      "authenticate" portion by hand, here.
 845                          *
 846                          *      Once the tunneled EAP session is ALMOST
 847                          *      done, THEN we proxy it...
 848                          */
 849                         if (!t->proxy_tunneled_request_as_eap) {
 850                                 fake->options |= RAD_REQUEST_OPTION_PROXY_EAP;
 851
 852                                 /*
 853                                  *      Hmm... should we check for
 854                                  *      Auth-Type & EAP-Message here?
 855                                  */
 856
 857
 858                                 /*
 859                                  *      Run the EAP authentication.
 860                                  */
 861                                 DEBUG2("  PEAP: Calling authenticate in order to initiate tunneled EAP session.");
 862                                 rcode = module_authenticate(PW_AUTHTYPE_EAP, fake);
 863                                 if (rcode == RLM_MODULE_OK) {
 864                                         /*
 865                                          *      Authentication succeeded! Rah!
 866                                          */
 867                                         fake->reply->code = PW_AUTHENTICATION_ACK;
 868                                         goto do_process;
 869                                 }
 870
 871                                 if (rcode != RLM_MODULE_HANDLED) {
 872                                         DEBUG2("  PEAP: Can't handle the return code %d", rcode);
 873                                         rcode = RLM_MODULE_REJECT;
 874                                         goto done;
 875                                 }
 876
 877                                 /*
 878                                  *      The module decided it wasn't
 879                                  *      done.  Handle it like normal.
 880                                  */
 881                                 if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) == 0) {
 882                                         DEBUG2("    PEAP: Cancelling proxy to realm %s until the tunneled EAP session has been established", vp->vp_strvalue);
 883                                         goto do_process;
 884                                 }
 885
 886                                 /*
 887                                  *      The module has decoded the
 888                                  *      EAP-Message into another set
 889                                  *      of attributes.
 890                                  */
 891                                 pairdelete(&fake->packet->vps,
 892                                            PW_EAP_MESSAGE);
 893                         }
 894
 895                         DEBUG2("  PEAP: Tunneled authentication will be proxied to %s", vp->vp_strvalue);
 896
 897                         /*
 898                          *      Tell the original request that it's going
 899                          *      to be proxied.
 900                          */
 901                         pairmove2(&(request->config_items),
 902                                   &(fake->config_items),
 903                                   PW_PROXY_TO_REALM);
 904
 905                         /*
 906                          *      Seed the proxy packet with the
 907                          *      tunneled request.
 908                          */
 909                         rad_assert(request->proxy == NULL);
 910                         request->proxy = fake->packet;
 911                         fake->packet = NULL;
 912                         rad_free(&fake->reply);
 913                         fake->reply = NULL;
 914
 915                         /*
 916                          *      Set up the callbacks for the tunnel
 917                          */
 918                         tunnel = rad_malloc(sizeof(*tunnel));
 919                         memset(tunnel, 0, sizeof(*tunnel));
 920
 921                         tunnel->tls_session = tls_session;
 922                         tunnel->callback = eappeap_postproxy;
 923
 924                         /*
 925                          *      Associate the callback with the request.
 926                          */
 927                         rcode = request_data_add(request,
 928                                                  request->proxy,
 929                                                  REQUEST_DATA_EAP_TUNNEL_CALLBACK,
 930                                                  tunnel, free);
 931                         rad_assert(rcode == 0);
 932
 933                         /*
 934                          *      We're not proxying it as EAP, so we've got
 935                          *      to do the callback later.
 936                          */
 937                         if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) != 0) {
 938                                 DEBUG2("  PEAP: Remembering to do EAP-MS-CHAP-V2 post-proxy.");
 939
 940                                 /*
 941                                  *      rlm_eap.c has taken care of associating
 942                                  *      the handler with the fake request.
 943                                  *
 944                                  *      So we associate the fake request with
 945                                  *      this request.
 946                                  */
 947                                 rcode = request_data_add(request,
 948                                                          request->proxy,
 949                                                          REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK,
 950                                                          fake, my_request_free);
 951                                 rad_assert(rcode == 0);
 952
 953                                 /*
 954                                  *      Do NOT free the fake request!
 955                                  */
 956                                 return RLM_MODULE_UPDATED;
 957                         }
 958
 959                         /*
 960                          *      Didn't authenticate the packet, but
 961                          *      we're proxying it.
 962                          */
 963                         rcode = RLM_MODULE_UPDATED;
 964
 965                 } else {
 966                         DEBUG2("  PEAP: Unknown RADIUS packet type %d: rejecting tunneled user", fake->reply->code);
 967                         rcode = RLM_MODULE_REJECT;
 968                 }
 969                 break;
 970
 971         default:
 972         do_process:
 973                 rcode = process_reply(handler, tls_session, request,
 974                                       fake->reply);
 975                 break;
 976         }
 977
 978  done:
 979         request_free(&fake);
 980
 981         return rcode;
 982 }