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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  *   Copyright 2003 Alan DeKok <aland@freeradius.org>
  21  */
  22 #include "eap_tls.h"
  23 #include "eap_peap.h"
  24
  25 /*
  26  *      Send protected EAP-Failure
  27  *
  28  *       Result-TLV = Failure
  29  */
  30 static int eappeap_failure(EAP_HANDLER *handler, tls_session_t *tls_session)
  31 {
  32         uint8_t tlv_packet[11];
  33
  34         DEBUG2("  rlm_eap_peap: FAILURE");
  35
  36         tlv_packet[0] = PW_EAP_REQUEST;
  37         tlv_packet[1] = handler->eap_ds->response->id +1;
  38         tlv_packet[2] = 0;
  39         tlv_packet[3] = 11;     /* length of this packet */
  40         tlv_packet[4] = PW_EAP_TLV;
  41         tlv_packet[5] = 0x80;
  42         tlv_packet[6] = EAP_TLV_ACK_RESULT;
  43         tlv_packet[7] = 0;
  44         tlv_packet[8] = 2;      /* length of the data portion */
  45         tlv_packet[9] = 0;
  46         tlv_packet[10] = EAP_TLV_FAILURE;
  47
  48         record_plus(&tls_session->clean_in, tlv_packet, 11);
  49
  50         /*
  51          *      FIXME: Check the return code.
  52          */
  53         tls_handshake_send(tls_session);
  54         record_init(&tls_session->clean_in);
  55
  56         return 1;
  57 }
  58
  59
  60 /*
  61  *      Send protected EAP-Success
  62  *
  63  *       Result-TLV = Success
  64  */
  65 static int eappeap_success(EAP_HANDLER *handler, tls_session_t *tls_session)
  66 {
  67         uint8_t tlv_packet[11];
  68
  69         DEBUG2("  rlm_eap_peap: SUCCESS");
  70
  71         tlv_packet[0] = PW_EAP_REQUEST;
  72         tlv_packet[1] = handler->eap_ds->response->id +1;
  73         tlv_packet[2] = 0;
  74         tlv_packet[3] = 11;     /* length of this packet */
  75         tlv_packet[4] = PW_EAP_TLV;
  76         tlv_packet[5] = 0x80;   /* mandatory AVP */
  77         tlv_packet[6] = EAP_TLV_ACK_RESULT;
  78         tlv_packet[7] = 0;
  79         tlv_packet[8] = 2;      /* length of the data portion */
  80         tlv_packet[9] = 0;
  81         tlv_packet[10] = EAP_TLV_SUCCESS;
  82
  83         record_plus(&tls_session->clean_in, tlv_packet, 11);
  84
  85         /*
  86          *      FIXME: Check the return code.
  87          */
  88         tls_handshake_send(tls_session);
  89         record_init(&tls_session->clean_in);
  90
  91         return 1;
  92 }
  93
  94
  95 /*
  96  *      Verify the tunneled EAP message.
  97  */
  98 static int eapmessage_verify(const uint8_t *data, unsigned int data_len)
  99 {
 100         const eap_packet_t *eap_packet = (const eap_packet_t *) data;
 101         uint8_t eap_type;
 102         char identity[256];
 103
 104         if (!data || (data_len <= 1)) {
 105                 return 0;
 106         }
 107
 108         eap_type = *data;
 109         switch (eap_type) {
 110         case PW_EAP_IDENTITY:
 111                 memcpy(identity, data + 1, data_len - 1);
 112                 identity[data_len - 1] = '\0';
 113                 DEBUG2("  rlm_eap_peap: Identity - %s", identity);
 114                 return 1;
 115                 break;
 116
 117                 /*
 118                  *      If the first byte of the packet is
 119                  *      EAP-Response, and the EAP data is a TLV,
 120                  *      then it looks OK...
 121                  */
 122         case PW_EAP_RESPONSE:
 123                 if (eap_packet->data[0] == PW_EAP_TLV) {
 124                         DEBUG2("  rlm_eap_peap: Received EAP-TLV response.");
 125                         return 1;
 126                 }
 127                 DEBUG2("  rlm_eap_peap: Got something weird.");
 128                 break;
 129
 130
 131                 /*
 132                  *      We normally do Microsoft MS-CHAPv2 (26), versus
 133                  *      Cisco MS-CHAPv2 (29).
 134                  */
 135         case PW_EAP_MSCHAPV2:
 136         default:
 137                 DEBUG2("  rlm_eap_peap: EAP type %s",
 138                        eaptype_type2name(eap_type,
 139                                          identity, sizeof(identity)));
 140                 return 1;
 141                 break;
 142         }
 143
 144         return 0;
 145 }
 146
 147 /*
 148  *      Convert a pseudo-EAP packet to a list of VALUE_PAIR's.
 149  */
 150 static VALUE_PAIR *eap2vp(EAP_DS *eap_ds,
 151                           const uint8_t *data, unsigned int data_len)
 152 {
 153         VALUE_PAIR *vp = NULL;
 154
 155         /*
 156          *      Sanity check this...
 157          */
 158         if (data_len + EAP_HEADER_LEN > MAX_STRING_LEN) {
 159                 radlog(L_ERR, "rlm_eap_peap: EAP Response packet is too large.  Code must be fixed to handle this.");
 160                 return NULL;
 161         }
 162
 163         vp = paircreate(PW_EAP_MESSAGE, PW_TYPE_OCTETS);
 164         if (!vp) {
 165                 DEBUG2("  rlm_eap_peap: Failure in creating VP");
 166                 return NULL;
 167         }
 168
 169         /*
 170          *      Hand-build an EAP packet from the crap in PEAP version 0.
 171          */
 172         vp->strvalue[0] = PW_EAP_RESPONSE;
 173         vp->strvalue[1] = eap_ds->response->id;
 174         vp->strvalue[2] = 0;
 175         vp->strvalue[3] = EAP_HEADER_LEN + data_len;
 176
 177         memcpy(vp->strvalue + EAP_HEADER_LEN, data, data_len);
 178         vp->length = EAP_HEADER_LEN + data_len;
 179
 180         return vp;
 181 }
 182
 183
 184 /*
 185  *      Convert a list of VALUE_PAIR's to an EAP packet, through the
 186  *      simple expedient of dumping the EAP message
 187  */
 188 static int vp2eap(tls_session_t *tls_session, VALUE_PAIR *vp)
 189 {
 190         if (vp->next != NULL) {
 191                 radlog(L_ERR, "rlm_eap_peap: EAP Request packet is too large.  Code must be fixed to handle this.");
 192                 return 0;
 193         }
 194
 195         /*
 196          *      Skip the id, code, and length.  Just write the EAP
 197          *      type & data to the client.
 198          */
 199 #ifndef NDEBUG
 200         if (debug_flag > 2) {
 201                 int i;
 202                 int total = vp->length - 4;
 203
 204                 if (debug_flag > 0) for (i = 0; i < total; i++) {
 205                         if ((i & 0x0f) == 0) printf("  PEAP tunnel data out %04x: ", i);
 206
 207                         printf("%02x ", vp->strvalue[i + 4]);
 208
 209                         if ((i & 0x0f) == 0x0f) printf("\n");
 210                 }
 211                 if ((total & 0x0f) != 0) printf("\n");
 212         }
 213 #endif
 214
 215         /*
 216          *      Send the EAP data, WITHOUT the header.
 217          */
 218 #if 1
 219         record_plus(&tls_session->clean_in, vp->strvalue + EAP_HEADER_LEN,
 220                 vp->length - EAP_HEADER_LEN);
 221 #else
 222         record_plus(&tls_session->clean_in, vp->strvalue, vp->length);
 223 #endif
 224         tls_handshake_send(tls_session);
 225         record_init(&tls_session->clean_in);
 226
 227         return 1;
 228 }
 229
 230
 231 /*
 232  *      See if there's a TLV in the response.
 233  */
 234 static int eappeap_check_tlv(const uint8_t *data)
 235 {
 236         const eap_packet_t *eap_packet = (const eap_packet_t *) data;
 237
 238         /*
 239          *      Look for success or failure.
 240          */
 241         if ((eap_packet->code == PW_EAP_RESPONSE) &&
 242             (eap_packet->data[0] == PW_EAP_TLV)) {
 243                 if (data[10] == EAP_TLV_SUCCESS) {
 244                         return 1;
 245                 }
 246
 247                 if (data[10] == EAP_TLV_FAILURE) {
 248                         DEBUG2("  rlm_eap_peap: Client rejected our response.  The password is probably incorrect.");
 249                         return 0;
 250                 }
 251         }
 252
 253         return 0;
 254 }
 255
 256
 257 /*
 258  *      Use a reply packet to determine what to do.
 259  */
 260 static int process_reply(EAP_HANDLER *handler, tls_session_t *tls_session,
 261                          REQUEST *request, RADIUS_PACKET *reply)
 262 {
 263         int rcode = RLM_MODULE_REJECT;
 264         VALUE_PAIR *vp;
 265         peap_tunnel_t *t = tls_session->opaque;
 266
 267 #ifndef NDEBUG
 268         if (debug_flag > 0) {
 269                 printf("  PEAP: Processing from tunneled session code %p %d\n",
 270                        reply, reply->code);
 271
 272                 for (vp = reply->vps; vp != NULL; vp = vp->next) {
 273                         putchar('\t');vp_print(stdout, vp);putchar('\n');
 274                 }
 275         }
 276 #endif
 277
 278         switch (reply->code) {
 279         case PW_AUTHENTICATION_ACK:
 280                 DEBUG2("  PEAP: Tunneled authentication was successful.");
 281                 t->status = PEAP_STATUS_SENT_TLV_SUCCESS;
 282                 eappeap_success(handler, tls_session);
 283                 rcode = RLM_MODULE_HANDLED;
 284
 285                 /*
 286                  *      If we've been told to use the attributes from
 287                  *      the reply, then do so.
 288                  *
 289                  *      WARNING: This may leak information about the
 290                  *      tunneled user!
 291                  */
 292                 if (t->use_tunneled_reply) {
 293                         /*
 294                          *      Clean up the tunneled reply.
 295                          */
 296                         pairdelete(&reply->vps, PW_PROXY_STATE);
 297                         pairdelete(&reply->vps, PW_EAP_MESSAGE);
 298
 299                         pairadd(&request->reply->vps, reply->vps);
 300                         reply->vps = NULL;
 301                 }
 302                 break;
 303
 304         case PW_AUTHENTICATION_REJECT:
 305                 DEBUG2("  PEAP: Tunneled authentication was rejected.");
 306                 t->status = PEAP_STATUS_SENT_TLV_FAILURE;
 307                 eappeap_failure(handler, tls_session);
 308                 rcode = RLM_MODULE_HANDLED;
 309                 break;
 310
 311         case PW_ACCESS_CHALLENGE:
 312                 DEBUG2("  PEAP: Got tunneled Access-Challenge");
 313
 314                 /*
 315                  *      Keep the State attribute, if necessary.
 316                  *
 317                  *      Get rid of the old State, too.
 318                  */
 319                 pairfree(&t->state);
 320                 pairmove2(&t->state, &(reply->vps), PW_STATE);
 321
 322                 /*
 323                  *      PEAP takes only EAP-Message attributes inside
 324                  *      of the tunnel.  Any Reply-Message in the
 325                  *      Access-Challenge is ignored.
 326                  */
 327                 vp = NULL;
 328                 pairmove2(&vp, &(reply->vps), PW_EAP_MESSAGE);
 329
 330                 /*
 331                  *      Handle the ACK, by tunneling any necessary reply
 332                  *      VP's back to the client.
 333                  */
 334                 if (vp) {
 335                         vp2eap(tls_session, vp);
 336                         pairfree(&vp);
 337                 }
 338
 339                 rcode = RLM_MODULE_HANDLED;
 340                 break;
 341
 342         default:
 343                 DEBUG2("  PEAP: Unknown RADIUS packet type %d: rejecting tunneled user", reply->code);
 344                 rcode = RLM_MODULE_REJECT;
 345                 break;
 346         }
 347
 348         return rcode;
 349 }
 350
 351
 352 /*
 353  *      Do post-proxy processing,
 354  */
 355 static int eappeap_postproxy(EAP_HANDLER *handler, void *data)
 356 {
 357         int rcode;
 358         tls_session_t *tls_session = (tls_session_t *) data;
 359         REQUEST *fake;
 360
 361         DEBUG2("  PEAP: Passing reply from proxy back into the tunnel.");
 362
 363         /*
 364          *      If there was a fake request associated with the proxied
 365          *      request, do more processing of it.
 366          */
 367         fake = (REQUEST *) request_data_get(handler->request,
 368                                             handler->request->proxy,
 369                                             REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK);
 370
 371         /*
 372          *      Do the callback, if it exists, and if it was a success.
 373          */
 374         if (fake && (handler->request->proxy_reply->code == PW_AUTHENTICATION_ACK)) {
 375                 VALUE_PAIR *vp;
 376                 REQUEST *request = handler->request;
 377
 378                 /*
 379                  *      Terrible hacks.
 380                  */
 381                 rad_assert(fake->packet == NULL);
 382                 fake->packet = request->proxy;
 383                 request->proxy = NULL;
 384
 385                 rad_assert(fake->reply == NULL);
 386                 fake->reply = request->proxy_reply;
 387                 request->proxy_reply = NULL;
 388
 389                 /*
 390                  *      We MAY have deleted the state.  If so, add
 391                  *      it back in.
 392                  */
 393                 vp = pairfind(fake->packet->vps, PW_STATE);
 394                 if (!vp) {
 395                         vp = pairmake("State", "0x00", T_OP_EQ);
 396                         memcpy(vp->strvalue, handler->state,
 397                                sizeof(handler->state));
 398                         vp->length = sizeof(handler->state);
 399                         pairadd(&fake->packet->vps, vp);
 400                 }
 401
 402                 /*
 403                  *      The NT Domain may have been removed, too.
 404                  *      Add it back in.
 405                  */
 406                 vp = pairfind(fake->packet->vps, PW_USER_NAME);
 407                 if (vp) {
 408                         strNcpy(vp->strvalue, handler->identity,
 409                                 sizeof(vp->strvalue));
 410                         vp->length = strlen(vp->strvalue);
 411                 }
 412
 413                 /*
 414                  *      Perform a post-auth stage, which will get the EAP
 415                  *      handler, too...
 416                  */
 417                 fake->options &= ~RAD_REQUEST_OPTION_PROXY_EAP;
 418                 DEBUG2("  PEAP: Passing reply back for EAP-MS-CHAP-V2 %p %d",
 419                        fake, fake->reply->code);
 420                 rcode = module_post_proxy(fake);
 421
 422                 /*
 423                  *      FIXME: If rcode returns fail, do something
 424                  *      intelligent...
 425                  */
 426                 DEBUG2("  POST-PROXY %d", rcode);
 427                 rcode = rad_postauth(fake);
 428                 DEBUG2("  POST-AUTH %d", rcode);
 429
 430 #ifndef NDEBUG
 431                 if (debug_flag > 0) {
 432                         printf("  PEAP: Final reply from tunneled session code %d\n",
 433                                fake->reply->code);
 434
 435                         for (vp = fake->reply->vps; vp != NULL; vp = vp->next) {
 436                                 putchar('\t');vp_print(stdout, vp);putchar('\n');
 437                         }
 438                 }
 439 #endif
 440
 441                 /*
 442                  *      Terrible hacks.
 443                  */
 444                 request->proxy = fake->packet;
 445                 fake->packet = NULL;
 446                 request->proxy_reply = fake->reply;
 447                 fake->reply = NULL;
 448
 449                 /*
 450                  *      And we're done with this request.
 451                  */
 452
 453                 switch (rcode) {
 454                 case RLM_MODULE_FAIL:
 455                         request_free(&fake);
 456                         eaptls_fail(handler->eap_ds, 0);
 457                         return 0;
 458                         break;
 459
 460                 default:  /* Don't Do Anything */
 461                         DEBUG2(" PEAP: Got reply %d",
 462                                request->proxy_reply->code);
 463                         break;
 464                 }
 465         }
 466         request_free(&fake);    /* robust if fake == NULL */
 467
 468         /*
 469          *      If there was no EAP-Message in the reply packet, then
 470          *      we know that we're supposed to re-run the "authenticate"
 471          *      stage, in order to get the right kind of handling...
 472          */
 473
 474         /*
 475          *      Process the reply from the home server.
 476          */
 477
 478         rcode = process_reply(handler, tls_session, handler->request,
 479                               handler->request->proxy_reply);
 480
 481         /*
 482          *      The proxy code uses the reply from the home server as
 483          *      the basis for the reply to the NAS.  We don't want that,
 484          *      so we toss it, after we've had our way with it.
 485          */
 486         pairfree(&handler->request->proxy_reply->vps);
 487
 488         switch (rcode) {
 489         case RLM_MODULE_REJECT:
 490                 DEBUG2("  PEAP: Reply was rejected");
 491                 eaptls_fail(handler->eap_ds, 0);
 492                 return 0;
 493
 494         case RLM_MODULE_HANDLED:
 495                 DEBUG2("  PEAP: Reply was handled");
 496                 eaptls_request(handler->eap_ds, tls_session);
 497                 return 1;
 498
 499         case RLM_MODULE_OK:
 500                 DEBUG2("  PEAP: Reply was OK");
 501                 eaptls_success(handler->eap_ds, 0);
 502                 eaptls_gen_mppe_keys(&handler->request->reply->vps,
 503                                      tls_session->ssl,
 504                                      "client EAP encryption");
 505                 return 1;
 506
 507         default:
 508                 DEBUG2("  PEAP: Reply was unknown.");
 509                 break;
 510         }
 511
 512         eaptls_fail(handler->eap_ds, 0);
 513         return 0;
 514 }
 515
 516 /*
 517  *      Free a request.
 518  */
 519 static void my_request_free(void *data)
 520 {
 521         REQUEST *request = (REQUEST *)data;
 522
 523         request_free(&request);
 524 }
 525
 526
 527 /*
 528  *      Process the pseudo-EAP contents of the tunneled data.
 529  */
 530 int eappeap_process(EAP_HANDLER *handler, tls_session_t *tls_session)
 531 {
 532         int err;
 533         peap_tunnel_t *t = tls_session->opaque;
 534         REQUEST *fake;
 535         VALUE_PAIR *vp;
 536         int rcode = RLM_MODULE_REJECT;
 537         const uint8_t *data;
 538         unsigned int data_len;
 539         unsigned char buffer[1024];
 540 #ifndef NDEBUG
 541         int i;
 542 #endif
 543
 544         REQUEST *request = handler->request;
 545         EAP_DS *eap_ds = handler->eap_ds;
 546
 547         /*
 548          *      Grab the dirty data, and copy it to our buffer.
 549          *
 550          *      I *really* don't like these 'record_t' things...
 551          */
 552         data_len = record_minus(&tls_session->dirty_in, buffer, sizeof(buffer));
 553         data = buffer;
 554
 555         /*
 556          *      Write the data from the dirty buffer (i.e. packet
 557          *      data) into the buffer which we will give to SSL for
 558          *      decoding.
 559          *
 560          *      Some of this code COULD technically go into the TLS
 561          *      module, in eaptls_process(), where it returns EAPTLS_OK.
 562          *
 563          *      Similarly, the writing of data to the SSL context could
 564          *      go there, too...
 565          */
 566         BIO_write(tls_session->into_ssl, buffer, data_len);
 567         record_init(&tls_session->clean_out);
 568
 569         /*
 570          *      Read (and decrypt) the tunneled data from the SSL session,
 571          *      and put it into the decrypted data buffer.
 572          */
 573         err = SSL_read(tls_session->ssl, tls_session->clean_out.data,
 574                        sizeof(tls_session->clean_out.data));
 575         if (err < 0) {
 576                 /*
 577                  *      FIXME: Call SSL_get_error() to see what went
 578                  *      wrong.
 579                  */
 580                 radlog(L_INFO, "rlm_eap_peap: SSL_read Error");
 581                 return RLM_MODULE_REJECT;
 582         }
 583
 584         /*
 585          *      If there's no data, maybe this is an ACK to an
 586          *      MS-CHAP2-Success.
 587          */
 588         if (err == 0) {
 589                 /*
 590                  *      FIXME: Call SSL_get_error() to see what went
 591                  *      wrong.
 592                  */
 593                 radlog(L_INFO, "rlm_eap_peap: No data inside of the tunnel.");
 594                 return RLM_MODULE_REJECT;
 595         }
 596
 597         data_len = tls_session->clean_out.used = err;
 598         data = tls_session->clean_out.data;
 599
 600 #ifndef NDEBUG
 601         if (debug_flag > 2) {
 602                 for (i = 0; i < data_len; i++) {
 603                         if ((i & 0x0f) == 0) printf("  PEAP tunnel data in %04x: ", i);
 604
 605                         printf("%02x ", data[i]);
 606
 607                         if ((i & 0x0f) == 0x0f) printf("\n");
 608                 }
 609                 if ((data_len & 0x0f) != 0) printf("\n");
 610         }
 611 #endif
 612
 613         if (!eapmessage_verify(data, data_len)) {
 614                 return RLM_MODULE_REJECT;
 615         }
 616
 617         DEBUG2("  rlm_eap_peap: Tunneled data is valid.");
 618
 619         /*
 620          *      If we authenticated the user, then it's OK.
 621          */
 622         if (t->status == PEAP_STATUS_SENT_TLV_SUCCESS) {
 623                 if (eappeap_check_tlv(data)) {
 624                         DEBUG2("  rlm_eap_peap: Success");
 625                         return RLM_MODULE_OK;
 626                 }
 627
 628                 return RLM_MODULE_REJECT;
 629
 630         } else if (t->status == PEAP_STATUS_SENT_TLV_FAILURE) {
 631                 DEBUG2("  rlm_eap_peap:  Had sent TLV failure, rejecting.");
 632                 return RLM_MODULE_REJECT;
 633         }
 634
 635         fake = request_alloc_fake(request);
 636
 637         rad_assert(fake->packet->vps == NULL);
 638
 639         fake->packet->vps = eap2vp(eap_ds, data, data_len);
 640         if (!fake->packet->vps) {
 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->strvalue, data + 1, data_len - 1);
 677                         t->username->length = data_len - 1;
 678                         t->username->strvalue[t->username->length] = 0;
 679                         DEBUG2("  PEAP: Got tunneled identity of %s", t->username->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->lvalue = 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->strvalue);
 700         }
 701
 702         /*
 703          *      Add the State attribute, too, if it exists.
 704          */
 705         if (t->state) {
 706                 DEBUG2("  PEAP: Adding old state with %02x %02x",
 707                        t->state->strvalue[0], t->state->strvalue[1]);
 708                 vp = paircopy(t->state);
 709                 if (vp) pairadd(&fake->packet->vps, vp);
 710         }
 711
 712         /*
 713          *      If this is set, we copy SOME of the request attributes
 714          *      from outside of the tunnel to inside of the tunnel.
 715          *
 716          *      We copy ONLY those attributes which do NOT already
 717          *      exist in the tunneled request.
 718          *
 719          *      This code is copied from ../rlm_eap_ttls/ttls.c
 720          */
 721         if (t->copy_request_to_tunnel) {
 722                 VALUE_PAIR *copy;
 723
 724                 for (vp = request->packet->vps; vp != NULL; vp = vp->next) {
 725                         /*
 726                          *      The attribute is a server-side thingy,
 727                          *      don't copy it.
 728                          */
 729                         if ((vp->attribute > 255) &&
 730                             (((vp->attribute >> 16) & 0xffff) == 0)) {
 731                                 continue;
 732                         }
 733
 734                         /*
 735                          *      The outside attribute is already in the
 736                          *      tunnel, don't copy it.
 737                          *
 738                          *      This works for BOTH attributes which
 739                          *      are originally in the tunneled request,
 740                          *      AND attributes which are copied there
 741                          *      from below.
 742                          */
 743                         if (pairfind(fake->packet->vps, vp->attribute)) {
 744                                 continue;
 745                         }
 746
 747                         /*
 748                          *      Some attributes are handled specially.
 749                          */
 750                         switch (vp->attribute) {
 751                                 /*
 752                                  *      NEVER copy Message-Authenticator,
 753                                  *      EAP-Message, or State.  They're
 754                                  *      only for outside of the tunnel.
 755                                  */
 756                         case PW_USER_NAME:
 757                         case PW_USER_PASSWORD:
 758                         case PW_CHAP_PASSWORD:
 759                         case PW_CHAP_CHALLENGE:
 760                         case PW_PROXY_STATE:
 761                         case PW_MESSAGE_AUTHENTICATOR:
 762                         case PW_EAP_MESSAGE:
 763                         case PW_STATE:
 764                                 continue;
 765                                 break;
 766
 767                                 /*
 768                                  *      By default, copy it over.
 769                                  */
 770                         default:
 771                                 break;
 772                         }
 773
 774                         /*
 775                          *      Don't copy from the head, we've already
 776                          *      checked it.
 777                          */
 778                         copy = paircopy2(vp, vp->attribute);
 779                         pairadd(&fake->packet->vps, copy);
 780                 }
 781         }
 782
 783 #ifndef NDEBUG
 784         if (debug_flag > 0) {
 785                 printf("  PEAP: Sending tunneled request\n");
 786
 787                 for (vp = fake->packet->vps; vp != NULL; vp = vp->next) {
 788                         putchar('\t');vp_print(stdout, vp);putchar('\n');
 789                 }
 790         }
 791 #endif
 792
 793         /*
 794          *      Call authentication recursively, which will
 795          *      do PAP, CHAP, MS-CHAP, etc.
 796          */
 797         rad_authenticate(fake);
 798
 799         /*
 800          *      Note that we don't do *anything* with the reply
 801          *      attributes.
 802          */
 803 #ifndef NDEBUG
 804         if (debug_flag > 0) {
 805                 printf("  PEAP: Got tunneled reply RADIUS code %d\n",
 806                  fake->reply->code);
 807
 808                 for (vp = fake->reply->vps; vp != NULL; vp = vp->next) {
 809                         putchar('\t');vp_print(stdout, vp);putchar('\n');
 810                 }
 811         }
 812 #endif
 813
 814         /*
 815          *      Decide what to do with the reply.
 816          */
 817         switch (fake->reply->code) {
 818         case 0:                 /* No reply code, must be proxied... */
 819                 vp = pairfind(fake->config_items, PW_PROXY_TO_REALM);
 820
 821                 if (vp) {
 822                         eap_tunnel_data_t *tunnel;
 823
 824                         /*
 825                          *      The tunneled request was NOT handled,
 826                          *      it has to be proxied.  This means that
 827                          *      the "authenticate" stage was never
 828                          *      performed.
 829                          *
 830                          *      If we are told to NOT proxy the
 831                          *      tunneled request as EAP, then this
 832                          *      means that we've got to decode it,
 833                          *      which means that we MUST run the
 834                          *      "authenticate" portion by hand, here.
 835                          *
 836                          *      Once the tunneled EAP session is ALMOST
 837                          *      done, THEN we proxy it...
 838                          */
 839                         if (!t->proxy_tunneled_request_as_eap) {
 840                                 fake->options |= RAD_REQUEST_OPTION_PROXY_EAP;
 841
 842                                 /*
 843                                  *      Hmm... should we check for
 844                                  *      Auth-Type & EAP-Message here?
 845                                  */
 846
 847
 848                                 /*
 849                                  *      Run the EAP authentication.
 850                                  */
 851                                 DEBUG2("  PEAP: Calling authenticate in order to initiate tunneled EAP session.");
 852                                 rcode = module_authenticate(PW_AUTHTYPE_EAP, fake);
 853                                 if (rcode == RLM_MODULE_OK) {
 854                                         /*
 855                                          *      Authentication succeeded! Rah!
 856                                          */
 857                                         fake->reply->code = PW_AUTHENTICATION_ACK;
 858                                         goto do_process;
 859                                 }
 860
 861                                 if (rcode != RLM_MODULE_HANDLED) {
 862                                         DEBUG2("  PEAP: Can't handle the return code %d", rcode);
 863                                         rcode = RLM_MODULE_REJECT;
 864                                         goto done;
 865                                 }
 866
 867                                 /*
 868                                  *      The module decided it wasn't
 869                                  *      done.  Handle it like normal.
 870                                  */
 871                                 if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) == 0) {
 872                                         DEBUG2("    PEAP: Cancelling proxy to realm %s until the tunneled EAP session has been established", vp->strvalue);
 873                                         goto do_process;
 874                                 }
 875
 876                                 /*
 877                                  *      The module has decoded the
 878                                  *      EAP-Message into another set
 879                                  *      of attributes.
 880                                  */
 881                                 pairdelete(&fake->packet->vps,
 882                                            PW_EAP_MESSAGE);
 883                         }
 884
 885                         DEBUG2("  PEAP: Tunneled authentication will be proxied to %s", vp->strvalue);
 886
 887                         /*
 888                          *      Tell the original request that it's going
 889                          *      to be proxied.
 890                          */
 891                         pairmove2(&(request->config_items),
 892                                   &(fake->config_items),
 893                                   PW_PROXY_TO_REALM);
 894
 895                         /*
 896                          *      Seed the proxy packet with the
 897                          *      tunneled request.
 898                          */
 899                         rad_assert(request->proxy == NULL);
 900                         request->proxy = fake->packet;
 901                         fake->packet = NULL;
 902                         rad_free(&fake->reply);
 903                         fake->reply = NULL;
 904
 905                         /*
 906                          *      Set up the callbacks for the tunnel
 907                          */
 908                         tunnel = rad_malloc(sizeof(*tunnel));
 909                         memset(tunnel, 0, sizeof(*tunnel));
 910
 911                         tunnel->tls_session = tls_session;
 912                         tunnel->callback = eappeap_postproxy;
 913
 914                         /*
 915                          *      Associate the callback with the request.
 916                          */
 917                         rcode = request_data_add(request,
 918                                                  request->proxy,
 919                                                  REQUEST_DATA_EAP_TUNNEL_CALLBACK,
 920                                                  tunnel, free);
 921                         rad_assert(rcode == 0);
 922
 923                         /*
 924                          *      We're not proxying it as EAP, so we've got
 925                          *      to do the callback later.
 926                          */
 927                         if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) != 0) {
 928                                 DEBUG2("  PEAP: Remembering to do EAP-MS-CHAP-V2 post-proxy.");
 929
 930                                 /*
 931                                  *      rlm_eap.c has taken care of associating
 932                                  *      the handler with the fake request.
 933                                  *
 934                                  *      So we associate the fake request with
 935                                  *      this request.
 936                                  */
 937                                 rcode = request_data_add(request,
 938                                                          request->proxy,
 939                                                          REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK,
 940                                                          fake, my_request_free);
 941                                 rad_assert(rcode == 0);
 942
 943                                 /*
 944                                  *      Do NOT free the fake request!
 945                                  */
 946                                 return RLM_MODULE_UPDATED;
 947                         }
 948
 949                         /*
 950                          *      Didn't authenticate the packet, but
 951                          *      we're proxying it.
 952                          */
 953                         rcode = RLM_MODULE_UPDATED;
 954
 955                 } else {
 956                         DEBUG2("  PEAP: Unknown RADIUS packet type %d: rejecting tunneled user", fake->reply->code);
 957                         rcode = RLM_MODULE_REJECT;
 958                 }
 959                 break;
 960
 961         default:
 962         do_process:
 963                 rcode = process_reply(handler, tls_session, request,
 964                                       fake->reply);
 965                 break;
 966         }
 967
 968  done:
 969         request_free(&fake);
 970
 971         return rcode;
 972 }