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                  *      Perform a post-auth stage, which will get the EAP
 391                  *      handler, too...
 392                  */
 393                 fake->options &= ~RAD_REQUEST_OPTION_PROXY_EAP;
 394                 DEBUG2("  PEAP: Passing reply back for EAP-MS-CHAP-V2 %p %d",
 395                        fake, fake->reply->code);
 396                 rcode = module_post_proxy(fake);
 397
 398                 /*
 399                  *      FIXME: If rcode returns fail, do something
 400                  *      intelligent...
 401                  */
 402                 DEBUG2("  POST-PROXY %d", rcode);
 403                 rcode = rad_postauth(fake);
 404                 DEBUG2("  POST-AUTH %d", rcode);
 405
 406 #ifndef NDEBUG
 407                 if (debug_flag > 0) {
 408                         printf("  PEAP: Final reply from tunneled session code %d\n",
 409                                fake->reply->code);
 410
 411                         for (vp = fake->reply->vps; vp != NULL; vp = vp->next) {
 412                                 putchar('\t');vp_print(stdout, vp);putchar('\n');
 413                         }
 414                 }
 415 #endif
 416
 417                 /*
 418                  *      Terrible hacks.
 419                  */
 420                 request->proxy = fake->packet;
 421                 fake->packet = NULL;
 422                 request->proxy_reply = fake->reply;
 423                 fake->reply = NULL;
 424
 425                 /*
 426                  *      And we're done with this request.
 427                  */
 428
 429                 switch (rcode) {
 430                 case RLM_MODULE_FAIL:
 431                         request_free(&fake);
 432                         eaptls_fail(handler->eap_ds, 0);
 433                         return 0;
 434                         break;
 435
 436                 default:  /* Don't Do Anything */
 437                         DEBUG2(" PEAP: Got reply %d",
 438                                request->proxy_reply->code);
 439                         break;
 440                 }
 441         }
 442         request_free(&fake);    /* robust if fake == NULL */
 443
 444         /*
 445          *      If there was no EAP-Message in the reply packet, then
 446          *      we know that we're supposed to re-run the "authenticate"
 447          *      stage, in order to get the right kind of handling...
 448          */
 449
 450         /*
 451          *      Process the reply from the home server.
 452          */
 453
 454         rcode = process_reply(handler, tls_session, handler->request,
 455                               handler->request->proxy_reply);
 456
 457         /*
 458          *      The proxy code uses the reply from the home server as
 459          *      the basis for the reply to the NAS.  We don't want that,
 460          *      so we toss it, after we've had our way with it.
 461          */
 462         pairfree(&handler->request->proxy_reply->vps);
 463
 464         switch (rcode) {
 465         case RLM_MODULE_REJECT:
 466                 DEBUG2("  PEAP: Reply was rejected");
 467                 eaptls_fail(handler->eap_ds, 0);
 468                 return 0;
 469
 470         case RLM_MODULE_HANDLED:
 471                 DEBUG2("  PEAP: Reply was handled");
 472                 eaptls_request(handler->eap_ds, tls_session);
 473                 return 1;
 474
 475         case RLM_MODULE_OK:
 476                 DEBUG2("  PEAP: Reply was OK");
 477                 eaptls_success(handler->eap_ds, 0);
 478                 eaptls_gen_mppe_keys(&handler->request->reply->vps,
 479                                      tls_session->ssl,
 480                                      "client EAP encryption");
 481                 return 1;
 482
 483         default:
 484                 DEBUG2("  PEAP: Reply was unknown.");
 485                 break;
 486         }
 487
 488         eaptls_fail(handler->eap_ds, 0);
 489         return 0;
 490 }
 491
 492 /*
 493  *      Free a request.
 494  */
 495 static void my_request_free(void *data)
 496 {
 497         REQUEST *request = (REQUEST *)data;
 498
 499         request_free(&request);
 500 }
 501
 502
 503 /*
 504  *      Process the pseudo-EAP contents of the tunneled data.
 505  */
 506 int eappeap_process(EAP_HANDLER *handler, tls_session_t *tls_session)
 507 {
 508         int err;
 509         peap_tunnel_t *t = tls_session->opaque;
 510         REQUEST *fake;
 511         VALUE_PAIR *vp;
 512         int rcode = RLM_MODULE_REJECT;
 513         const uint8_t *data;
 514         unsigned int data_len;
 515         unsigned char buffer[1024];
 516 #ifndef NDEBUG
 517         int i;
 518 #endif
 519
 520         REQUEST *request = handler->request;
 521         EAP_DS *eap_ds = handler->eap_ds;
 522
 523         /*
 524          *      Grab the dirty data, and copy it to our buffer.
 525          *
 526          *      I *really* don't like these 'record_t' things...
 527          */
 528         data_len = record_minus(&tls_session->dirty_in, buffer, sizeof(buffer));
 529         data = buffer;
 530
 531         /*
 532          *      Write the data from the dirty buffer (i.e. packet
 533          *      data) into the buffer which we will give to SSL for
 534          *      decoding.
 535          *
 536          *      Some of this code COULD technically go into the TLS
 537          *      module, in eaptls_process(), where it returns EAPTLS_OK.
 538          *
 539          *      Similarly, the writing of data to the SSL context could
 540          *      go there, too...
 541          */
 542         BIO_write(tls_session->into_ssl, buffer, data_len);
 543         record_init(&tls_session->clean_out);
 544
 545         /*
 546          *      Read (and decrypt) the tunneled data from the SSL session,
 547          *      and put it into the decrypted data buffer.
 548          */
 549         err = SSL_read(tls_session->ssl, tls_session->clean_out.data,
 550                        sizeof(tls_session->clean_out.data));
 551         if (err < 0) {
 552                 /*
 553                  *      FIXME: Call SSL_get_error() to see what went
 554                  *      wrong.
 555                  */
 556                 radlog(L_INFO, "rlm_eap_peap: SSL_read Error");
 557                 return RLM_MODULE_REJECT;
 558         }
 559
 560         /*
 561          *      If there's no data, maybe this is an ACK to an
 562          *      MS-CHAP2-Success.
 563          */
 564         if (err == 0) {
 565                 /*
 566                  *      FIXME: Call SSL_get_error() to see what went
 567                  *      wrong.
 568                  */
 569                 radlog(L_INFO, "rlm_eap_peap: No data inside of the tunnel.");
 570                 return RLM_MODULE_REJECT;
 571         }
 572
 573         data_len = tls_session->clean_out.used = err;
 574         data = tls_session->clean_out.data;
 575
 576 #ifndef NDEBUG
 577         if (debug_flag > 2) {
 578                 for (i = 0; i < data_len; i++) {
 579                         if ((i & 0x0f) == 0) printf("  PEAP tunnel data in %04x: ", i);
 580
 581                         printf("%02x ", data[i]);
 582
 583                         if ((i & 0x0f) == 0x0f) printf("\n");
 584                 }
 585                 if ((data_len & 0x0f) != 0) printf("\n");
 586         }
 587 #endif
 588
 589         if (!eapmessage_verify(data, data_len)) {
 590                 return RLM_MODULE_REJECT;
 591         }
 592
 593         DEBUG2("  rlm_eap_peap: Tunneled data is valid.");
 594
 595         /*
 596          *      If we authenticated the user, then it's OK.
 597          */
 598         if (t->status == PEAP_STATUS_SENT_TLV_SUCCESS) {
 599                 if (eappeap_check_tlv(data)) {
 600                         DEBUG2("  rlm_eap_peap: Success");
 601                         return RLM_MODULE_OK;
 602                 }
 603
 604                 return RLM_MODULE_REJECT;
 605
 606         } else if (t->status == PEAP_STATUS_SENT_TLV_FAILURE) {
 607                 DEBUG2("  rlm_eap_peap:  Had sent TLV failure.  User was rejcted rejected earlier in this session.");
 608                 return RLM_MODULE_REJECT;
 609         }
 610
 611         fake = request_alloc_fake(request);
 612
 613         rad_assert(fake->packet->vps == NULL);
 614
 615         fake->packet->vps = eap2vp(eap_ds, data, data_len);
 616         if (!fake->packet->vps) {
 617                 DEBUG2("  rlm_eap_peap: Unable to convert tunneled EAP packet to internal server data structures");
 618                 return PW_AUTHENTICATION_REJECT;
 619         }
 620
 621 #ifndef NDEBUG
 622         if (debug_flag > 0) {
 623           printf("  PEAP: Got tunneled EAP-Message\n");
 624
 625           for (vp = fake->packet->vps; vp != NULL; vp = vp->next) {
 626             putchar('\t');vp_print(stdout, vp);putchar('\n');
 627           }
 628         }
 629 #endif
 630
 631         /*
 632          *      Tell the request that it's a fake one.
 633          */
 634         vp = pairmake("Freeradius-Proxied-To", "127.0.0.1", T_OP_EQ);
 635         if (vp) {
 636                 pairadd(&fake->packet->vps, vp);
 637         }
 638
 639         /*
 640          *      Update other items in the REQUEST data structure.
 641          */
 642         if (!t->username) {
 643                 /*
 644                  *      There's no User-Name in the tunneled session,
 645                  *      so we add one here, by pulling it out of the
 646                  *      EAP-Identity packet.
 647                  */
 648                 if ((data[0] == PW_EAP_IDENTITY) && (data_len > 1)) {
 649                         t->username = pairmake("User-Name", "", T_OP_EQ);
 650                         rad_assert(t->username != NULL);
 651
 652                         memcpy(t->username->strvalue, data + 1, data_len - 1);
 653                         t->username->length = data_len - 1;
 654                         t->username->strvalue[t->username->length] = 0;
 655                         DEBUG2("  PEAP: Got tunneled identity of %s", t->username->strvalue);
 656
 657                         /*
 658                          *      If there's a default EAP type,
 659                          *      set it here.
 660                          */
 661                         if (t->default_eap_type != 0) {
 662                                 DEBUG2("  PEAP: Setting default EAP type for tunneled EAP session.");
 663                                 vp = pairmake("EAP-Type", "0", T_OP_EQ);
 664                                 vp->lvalue = t->default_eap_type;
 665                                 pairadd(&fake->config_items, vp);
 666                         }
 667                 }
 668         } /* else there WAS a t->username */
 669
 670         if (t->username) {
 671                 vp = paircopy(t->username);
 672                 pairadd(&fake->packet->vps, vp);
 673                 fake->username = pairfind(fake->packet->vps, PW_USER_NAME);
 674                 DEBUG2("  PEAP: Setting User-Name to %s",
 675                        fake->username->strvalue);
 676         }
 677
 678         /*
 679          *      Add the State attribute, too, if it exists.
 680          */
 681         if (t->state) {
 682                 DEBUG2("  PEAP: Adding old state with %02x %02x",
 683                        t->state->strvalue[0], t->state->strvalue[1]);
 684                 vp = paircopy(t->state);
 685                 if (vp) pairadd(&fake->packet->vps, vp);
 686         }
 687
 688         /*
 689          *      If this is set, we copy SOME of the request attributes
 690          *      from outside of the tunnel to inside of the tunnel.
 691          *
 692          *      We copy ONLY those attributes which do NOT already
 693          *      exist in the tunneled request.
 694          *
 695          *      This code is copied from ../rlm_eap_ttls/ttls.c
 696          */
 697         if (t->copy_request_to_tunnel) {
 698                 VALUE_PAIR *copy;
 699
 700                 for (vp = request->packet->vps; vp != NULL; vp = vp->next) {
 701                         /*
 702                          *      The attribute is a server-side thingy,
 703                          *      don't copy it.
 704                          */
 705                         if ((vp->attribute > 255) &&
 706                             (((vp->attribute >> 16) & 0xffff) == 0)) {
 707                                 continue;
 708                         }
 709
 710                         /*
 711                          *      The outside attribute is already in the
 712                          *      tunnel, don't copy it.
 713                          *
 714                          *      This works for BOTH attributes which
 715                          *      are originally in the tunneled request,
 716                          *      AND attributes which are copied there
 717                          *      from below.
 718                          */
 719                         if (pairfind(fake->packet->vps, vp->attribute)) {
 720                                 continue;
 721                         }
 722
 723                         /*
 724                          *      Some attributes are handled specially.
 725                          */
 726                         switch (vp->attribute) {
 727                                 /*
 728                                  *      NEVER copy Message-Authenticator,
 729                                  *      EAP-Message, or State.  They're
 730                                  *      only for outside of the tunnel.
 731                                  */
 732                         case PW_USER_NAME:
 733                         case PW_USER_PASSWORD:
 734                         case PW_CHAP_PASSWORD:
 735                         case PW_CHAP_CHALLENGE:
 736                         case PW_PROXY_STATE:
 737                         case PW_MESSAGE_AUTHENTICATOR:
 738                         case PW_EAP_MESSAGE:
 739                         case PW_STATE:
 740                                 continue;
 741                                 break;
 742
 743                                 /*
 744                                  *      By default, copy it over.
 745                                  */
 746                         default:
 747                                 break;
 748                         }
 749
 750                         /*
 751                          *      Don't copy from the head, we've already
 752                          *      checked it.
 753                          */
 754                         copy = paircopy2(vp, vp->attribute);
 755                         pairadd(&fake->packet->vps, copy);
 756                 }
 757         }
 758
 759 #ifndef NDEBUG
 760         if (debug_flag > 0) {
 761                 printf("  PEAP: Sending tunneled request\n");
 762
 763                 for (vp = fake->packet->vps; vp != NULL; vp = vp->next) {
 764                         putchar('\t');vp_print(stdout, vp);putchar('\n');
 765                 }
 766         }
 767 #endif
 768
 769         /*
 770          *      Call authentication recursively, which will
 771          *      do PAP, CHAP, MS-CHAP, etc.
 772          */
 773         rad_authenticate(fake);
 774
 775         /*
 776          *      Note that we don't do *anything* with the reply
 777          *      attributes.
 778          */
 779 #ifndef NDEBUG
 780         if (debug_flag > 0) {
 781                 printf("  PEAP: Got tunneled reply RADIUS code %d\n",
 782                  fake->reply->code);
 783
 784                 for (vp = fake->reply->vps; vp != NULL; vp = vp->next) {
 785                         putchar('\t');vp_print(stdout, vp);putchar('\n');
 786                 }
 787         }
 788 #endif
 789
 790         /*
 791          *      Decide what to do with the reply.
 792          */
 793         switch (fake->reply->code) {
 794         case 0:                 /* No reply code, must be proxied... */
 795                 vp = pairfind(fake->config_items, PW_PROXY_TO_REALM);
 796
 797                 if (vp) {
 798                         eap_tunnel_data_t *tunnel;
 799
 800                         /*
 801                          *      The tunneled request was NOT handled,
 802                          *      it has to be proxied.  This means that
 803                          *      the "authenticate" stage was never
 804                          *      performed.
 805                          *
 806                          *      If we are told to NOT proxy the
 807                          *      tunneled request as EAP, then this
 808                          *      means that we've got to decode it,
 809                          *      which means that we MUST run the
 810                          *      "authenticate" portion by hand, here.
 811                          *
 812                          *      Once the tunneled EAP session is ALMOST
 813                          *      done, THEN we proxy it...
 814                          */
 815                         if (!t->proxy_tunneled_request_as_eap) {
 816                                 fake->options |= RAD_REQUEST_OPTION_PROXY_EAP;
 817
 818                                 /*
 819                                  *      Hmm... should we check for
 820                                  *      Auth-Type & EAP-Message here?
 821                                  */
 822
 823
 824                                 /*
 825                                  *      Run the EAP authentication.
 826                                  */
 827                                 DEBUG2("  PEAP: Calling authenticate in order to initiate tunneled EAP session.");
 828                                 rcode = module_authenticate(PW_AUTHTYPE_EAP, fake);
 829                                 if (rcode == RLM_MODULE_OK) {
 830                                         /*
 831                                          *      Authentication succeeded! Rah!
 832                                          */
 833                                         fake->reply->code = PW_AUTHENTICATION_ACK;
 834                                         goto do_process;
 835                                 }
 836
 837                                 if (rcode != RLM_MODULE_HANDLED) {
 838                                         DEBUG2("  PEAP: Can't handle the return code %d", rcode);
 839                                         rcode = RLM_MODULE_REJECT;
 840                                         goto done;
 841                                 }
 842
 843                                 /*
 844                                  *      The module decided it wasn't
 845                                  *      done.  Handle it like normal.
 846                                  */
 847                                 if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) == 0) {
 848                                         DEBUG2("    PEAP: Cancelling proxy to realm %s until the tunneled EAP session has been established", vp->strvalue);
 849                                         goto do_process;
 850                                 }
 851
 852                                 /*
 853                                  *      The module has decoded the
 854                                  *      EAP-Message into another set
 855                                  *      of attributes.
 856                                  */
 857                                 pairdelete(&fake->packet->vps,
 858                                            PW_EAP_MESSAGE);
 859                         }
 860
 861                         DEBUG2("  PEAP: Tunneled authentication will be proxied to %s", vp->strvalue);
 862
 863                         /*
 864                          *      Tell the original request that it's going
 865                          *      to be proxied.
 866                          */
 867                         pairmove2(&(request->config_items),
 868                                   &(fake->config_items),
 869                                   PW_PROXY_TO_REALM);
 870
 871                         /*
 872                          *      Seed the proxy packet with the
 873                          *      tunneled request.
 874                          */
 875                         rad_assert(request->proxy == NULL);
 876                         request->proxy = fake->packet;
 877                         fake->packet = NULL;
 878                         rad_free(&fake->reply);
 879                         fake->reply = NULL;
 880
 881                         /*
 882                          *      Set up the callbacks for the tunnel
 883                          */
 884                         tunnel = rad_malloc(sizeof(*tunnel));
 885                         memset(tunnel, 0, sizeof(*tunnel));
 886
 887                         tunnel->tls_session = tls_session;
 888                         tunnel->callback = eappeap_postproxy;
 889
 890                         /*
 891                          *      Associate the callback with the request.
 892                          */
 893                         rcode = request_data_add(request,
 894                                                  request->proxy,
 895                                                  REQUEST_DATA_EAP_TUNNEL_CALLBACK,
 896                                                  tunnel, free);
 897                         rad_assert(rcode == 0);
 898
 899                         /*
 900                          *      We're not proxying it as EAP, so we've got
 901                          *      to do the callback later.
 902                          */
 903                         if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) != 0) {
 904                                 DEBUG2("  PEAP: Remembering to do EAP-MS-CHAP-V2 post-proxy.");
 905
 906                                 /*
 907                                  *      rlm_eap.c has taken care of associating
 908                                  *      the handler with the fake request.
 909                                  *
 910                                  *      So we associate the fake request with
 911                                  *      this request.
 912                                  */
 913                                 rcode = request_data_add(request,
 914                                                          request->proxy,
 915                                                          REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK,
 916                                                          fake, my_request_free);
 917                                 rad_assert(rcode == 0);
 918
 919                                 /*
 920                                  *      Do NOT free the fake request!
 921                                  */
 922                                 return RLM_MODULE_UPDATED;
 923                         }
 924
 925                         /*
 926                          *      Didn't authenticate the packet, but
 927                          *      we're proxying it.
 928                          */
 929                         rcode = RLM_MODULE_UPDATED;
 930
 931                 } else {
 932                         DEBUG2("  PEAP: Unknown RADIUS packet type %d: rejecting tunneled user", fake->reply->code);
 933                         rcode = RLM_MODULE_REJECT;
 934                 }
 935                 break;
 936
 937         default:
 938         do_process:
 939                 rcode = process_reply(handler, tls_session, request,
 940                                       fake->reply);
 941                 break;
 942         }
 943
 944  done:
 945         request_free(&fake);
 946
 947         return rcode;
 948 }