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