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, unsigned int data_len)
 154 {
 155         VALUE_PAIR *vp = NULL;
 156
 157         /*
 158          *      Sanity check this...
 159          */
 160         if (data_len + EAP_HEADER_LEN > MAX_STRING_LEN) {
 161                 radlog(L_ERR, "rlm_eap_peap: EAP Response packet is too large.  Code must be fixed to handle this.");
 162                 return NULL;
 163         }
 164
 165         vp = paircreate(PW_EAP_MESSAGE, PW_TYPE_OCTETS);
 166         if (!vp) {
 167                 DEBUG2("  rlm_eap_peap: Failure in creating VP");
 168                 return NULL;
 169         }
 170
 171         /*
 172          *      Hand-build an EAP packet from the crap in PEAP version 0.
 173          */
 174         vp->vp_strvalue[0] = PW_EAP_RESPONSE;
 175         vp->vp_strvalue[1] = eap_ds->response->id;
 176         vp->vp_strvalue[2] = 0;
 177         vp->vp_strvalue[3] = EAP_HEADER_LEN + data_len;
 178
 179         memcpy(vp->vp_strvalue + EAP_HEADER_LEN, data, data_len);
 180         vp->length = EAP_HEADER_LEN + data_len;
 181
 182         return vp;
 183 }
 184
 185
 186 /*
 187  *      Convert a list of VALUE_PAIR's to an EAP packet, through the
 188  *      simple expedient of dumping the EAP message
 189  */
 190 static int vp2eap(tls_session_t *tls_session, VALUE_PAIR *vp)
 191 {
 192         if (vp->next != NULL) {
 193                 radlog(L_ERR, "rlm_eap_peap: EAP Request packet is too large.  Code must be fixed to handle this.");
 194                 return 0;
 195         }
 196
 197         /*
 198          *      Skip the id, code, and length.  Just write the EAP
 199          *      type & data to the client.
 200          */
 201 #ifndef NDEBUG
 202         if (debug_flag > 2) {
 203                 int i;
 204                 int total = vp->length - 4;
 205
 206                 if (debug_flag > 0) for (i = 0; i < total; i++) {
 207                         if ((i & 0x0f) == 0) printf("  PEAP tunnel data out %04x: ", i);
 208
 209                         printf("%02x ", vp->vp_strvalue[i + 4]);
 210
 211                         if ((i & 0x0f) == 0x0f) printf("\n");
 212                 }
 213                 if ((total & 0x0f) != 0) printf("\n");
 214         }
 215 #endif
 216
 217         /*
 218          *      Send the EAP data, WITHOUT the header.
 219          */
 220 #if 1
 221         (tls_session->record_plus)(&tls_session->clean_in, vp->vp_strvalue + EAP_HEADER_LEN,
 222                 vp->length - EAP_HEADER_LEN);
 223 #else
 224         (tls_session->record_plus)(&tls_session->clean_in, vp->vp_strvalue, vp->length);
 225 #endif
 226         tls_handshake_send(tls_session);
 227
 228         return 1;
 229 }
 230
 231
 232 /*
 233  *      See if there's a TLV in the response.
 234  */
 235 static int eappeap_check_tlv(const uint8_t *data)
 236 {
 237         const eap_packet_t *eap_packet = (const eap_packet_t *) data;
 238
 239         /*
 240          *      Look for success or failure.
 241          */
 242         if ((eap_packet->code == PW_EAP_RESPONSE) &&
 243             (eap_packet->data[0] == PW_EAP_TLV)) {
 244                 if (data[10] == EAP_TLV_SUCCESS) {
 245                         return 1;
 246                 }
 247
 248                 if (data[10] == EAP_TLV_FAILURE) {
 249                         DEBUG2("  rlm_eap_peap: Client rejected our response.  The password is probably incorrect.");
 250                         return 0;
 251                 }
 252         }
 253
 254         return 0;
 255 }
 256
 257
 258 /*
 259  *      Use a reply packet to determine what to do.
 260  */
 261 static int process_reply(EAP_HANDLER *handler, tls_session_t *tls_session,
 262                          UNUSED REQUEST *request, RADIUS_PACKET *reply)
 263 {
 264         int rcode = RLM_MODULE_REJECT;
 265         VALUE_PAIR *vp;
 266         peap_tunnel_t *t = tls_session->opaque;
 267
 268 #ifndef NDEBUG
 269         if (debug_flag > 0) {
 270                 printf("  PEAP: Processing from tunneled session code %p %d\n",
 271                        reply, reply->code);
 272
 273                 for (vp = reply->vps; vp != NULL; vp = vp->next) {
 274                         putchar('\t');vp_print(stdout, vp);putchar('\n');
 275                 }
 276         }
 277 #endif
 278
 279         switch (reply->code) {
 280         case PW_AUTHENTICATION_ACK:
 281                 DEBUG2("  PEAP: Tunneled authentication was successful.");
 282                 t->status = PEAP_STATUS_SENT_TLV_SUCCESS;
 283                 eappeap_success(handler, tls_session);
 284                 rcode = RLM_MODULE_HANDLED;
 285
 286                 /*
 287                  *      If we've been told to use the attributes from
 288                  *      the reply, then do so.
 289                  *
 290                  *      WARNING: This may leak information about the
 291                  *      tunneled user!
 292                  */
 293                 if (t->use_tunneled_reply) {
 294                         DEBUG2("  Saving tunneled attributes for later");
 295
 296                         /*
 297                          *      Clean up the tunneled reply.
 298                          */
 299                         pairdelete(&reply->vps, PW_PROXY_STATE);
 300                         pairdelete(&reply->vps, PW_EAP_MESSAGE);
 301                         pairdelete(&reply->vps, PW_MESSAGE_AUTHENTICATOR);
 302
 303                         t->accept_vps = reply->vps;
 304                         reply->vps = NULL;
 305                 }
 306                 break;
 307
 308         case PW_AUTHENTICATION_REJECT:
 309                 DEBUG2("  PEAP: Tunneled authentication was rejected.");
 310                 t->status = PEAP_STATUS_SENT_TLV_FAILURE;
 311                 eappeap_failure(handler, tls_session);
 312                 rcode = RLM_MODULE_HANDLED;
 313                 break;
 314
 315         case PW_ACCESS_CHALLENGE:
 316                 DEBUG2("  PEAP: Got tunneled Access-Challenge");
 317
 318                 /*
 319                  *      Keep the State attribute, if necessary.
 320                  *
 321                  *      Get rid of the old State, too.
 322                  */
 323                 pairfree(&t->state);
 324                 pairmove2(&t->state, &(reply->vps), PW_STATE);
 325
 326                 /*
 327                  *      PEAP takes only EAP-Message attributes inside
 328                  *      of the tunnel.  Any Reply-Message in the
 329                  *      Access-Challenge is ignored.
 330                  */
 331                 vp = NULL;
 332                 pairmove2(&vp, &(reply->vps), PW_EAP_MESSAGE);
 333
 334                 /*
 335                  *      Handle EAP-MSCHAP-V2, where Access-Accept's
 336                  *      from the home server may contain MS-CHAP-Success,
 337                  *      which the module turns into challenges, so that
 338                  *      the client may respond to the challenge with
 339                  *      an "ack" packet.
 340                  */
 341                 if (t->home_access_accept && t->use_tunneled_reply) {
 342                         DEBUG2("  Saving tunneled attributes for later");
 343
 344                         /*
 345                          *      Clean up the tunneled reply.
 346                          */
 347                         pairdelete(&reply->vps, PW_PROXY_STATE);
 348                         pairdelete(&reply->vps, PW_MESSAGE_AUTHENTICATOR);
 349
 350                         t->accept_vps = reply->vps;
 351                         reply->vps = NULL;
 352                 }
 353
 354                 /*
 355                  *      Handle the ACK, by tunneling any necessary reply
 356                  *      VP's back to the client.
 357                  */
 358                 if (vp) {
 359                         vp2eap(tls_session, vp);
 360                         pairfree(&vp);
 361                 }
 362
 363                 rcode = RLM_MODULE_HANDLED;
 364                 break;
 365
 366         default:
 367                 DEBUG2("  PEAP: Unknown RADIUS packet type %d: rejecting tunneled user", reply->code);
 368                 rcode = RLM_MODULE_REJECT;
 369                 break;
 370         }
 371
 372         return rcode;
 373 }
 374
 375
 376 /*
 377  *      Do post-proxy processing,
 378  */
 379 static int eappeap_postproxy(EAP_HANDLER *handler, void *data)
 380 {
 381         int rcode;
 382         tls_session_t *tls_session = (tls_session_t *) data;
 383         REQUEST *fake;
 384
 385         DEBUG2("  PEAP: Passing reply from proxy back into the tunnel.");
 386
 387         /*
 388          *      If there was a fake request associated with the proxied
 389          *      request, do more processing of it.
 390          */
 391         fake = (REQUEST *) request_data_get(handler->request,
 392                                             handler->request->proxy,
 393                                             REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK);
 394
 395         /*
 396          *      Do the callback, if it exists, and if it was a success.
 397          */
 398         if (fake && (handler->request->proxy_reply->code == PW_AUTHENTICATION_ACK)) {
 399                 VALUE_PAIR *vp;
 400                 REQUEST *request = handler->request;
 401                 peap_tunnel_t *t = tls_session->opaque;
 402
 403                 t->home_access_accept = TRUE;
 404
 405                 /*
 406                  *      Terrible hacks.
 407                  */
 408                 rad_assert(fake->packet == NULL);
 409                 fake->packet = request->proxy;
 410                 request->proxy = NULL;
 411
 412                 rad_assert(fake->reply == NULL);
 413                 fake->reply = request->proxy_reply;
 414                 request->proxy_reply = NULL;
 415
 416                 /*
 417                  *      Perform a post-auth stage, which will get the EAP
 418                  *      handler, too...
 419                  */
 420                 fake->options &= ~RAD_REQUEST_OPTION_PROXY_EAP;
 421                 DEBUG2("  PEAP: Passing reply back for EAP-MS-CHAP-V2 %p %d",
 422                        fake, fake->reply->code);
 423                 rcode = module_post_proxy(0, fake);
 424
 425                 /*
 426                  *      FIXME: If rcode returns fail, do something
 427                  *      intelligent...
 428                  */
 429                 DEBUG2("  POST-PROXY %d", rcode);
 430                 rcode = rad_postauth(fake);
 431                 DEBUG2("  POST-AUTH %d", rcode);
 432
 433 #ifndef NDEBUG
 434                 if (debug_flag > 0) {
 435                         printf("  PEAP: Final reply from tunneled session code %d\n",
 436                                fake->reply->code);
 437
 438                         for (vp = fake->reply->vps; vp != NULL; vp = vp->next) {
 439                                 putchar('\t');vp_print(stdout, vp);putchar('\n');
 440                         }
 441                 }
 442 #endif
 443
 444                 /*
 445                  *      Terrible hacks.
 446                  */
 447                 request->proxy = fake->packet;
 448                 fake->packet = NULL;
 449                 request->proxy_reply = fake->reply;
 450                 fake->reply = NULL;
 451
 452                 /*
 453                  *      And we're done with this request.
 454                  */
 455
 456                 switch (rcode) {
 457                 case RLM_MODULE_FAIL:
 458                         request_free(&fake);
 459                         eaptls_fail(handler->eap_ds, 0);
 460                         return 0;
 461                         break;
 462
 463                 default:  /* Don't Do Anything */
 464                         DEBUG2(" PEAP: Got reply %d",
 465                                request->proxy_reply->code);
 466                         break;
 467                 }
 468         }
 469         request_free(&fake);    /* robust if fake == NULL */
 470
 471         /*
 472          *      If there was no EAP-Message in the reply packet, then
 473          *      we know that we're supposed to re-run the "authenticate"
 474          *      stage, in order to get the right kind of handling...
 475          */
 476
 477         /*
 478          *      Process the reply from the home server.
 479          */
 480
 481         rcode = process_reply(handler, tls_session, handler->request,
 482                               handler->request->proxy_reply);
 483
 484         /*
 485          *      The proxy code uses the reply from the home server as
 486          *      the basis for the reply to the NAS.  We don't want that,
 487          *      so we toss it, after we've had our way with it.
 488          */
 489         pairfree(&handler->request->proxy_reply->vps);
 490
 491         switch (rcode) {
 492         case RLM_MODULE_REJECT:
 493                 DEBUG2("  PEAP: Reply was rejected");
 494                 eaptls_fail(handler->eap_ds, 0);
 495                 return 0;
 496
 497         case RLM_MODULE_HANDLED:
 498                 DEBUG2("  PEAP: Reply was handled");
 499                 eaptls_request(handler->eap_ds, tls_session);
 500                 return 1;
 501
 502         case RLM_MODULE_OK:
 503                 DEBUG2("  PEAP: Reply was OK");
 504                 eaptls_success(handler->eap_ds, 0);
 505                 eaptls_gen_mppe_keys(&handler->request->reply->vps,
 506                                      tls_session->ssl,
 507                                      "client EAP encryption");
 508                 return 1;
 509
 510         default:
 511                 DEBUG2("  PEAP: Reply was unknown.");
 512                 break;
 513         }
 514
 515         eaptls_fail(handler->eap_ds, 0);
 516         return 0;
 517 }
 518
 519 /*
 520  *      Free a request.
 521  */
 522 static void my_request_free(void *data)
 523 {
 524         REQUEST *request = (REQUEST *)data;
 525
 526         request_free(&request);
 527 }
 528
 529
 530 /*
 531  *      Process the pseudo-EAP contents of the tunneled data.
 532  */
 533 int eappeap_process(EAP_HANDLER *handler, tls_session_t *tls_session)
 534 {
 535         int err;
 536         peap_tunnel_t *t = tls_session->opaque;
 537         REQUEST *fake;
 538         VALUE_PAIR *vp;
 539         int rcode = RLM_MODULE_REJECT;
 540         const uint8_t *data;
 541         unsigned int data_len;
 542         unsigned char buffer[1024];
 543 #ifndef NDEBUG
 544         int i;
 545 #endif
 546
 547         REQUEST *request = handler->request;
 548         EAP_DS *eap_ds = handler->eap_ds;
 549
 550         /*
 551          *      Grab the dirty data, and copy it to our buffer.
 552          *
 553          *      I *really* don't like these 'record_t' things...
 554          */
 555         data_len = (tls_session->record_minus)(&tls_session->dirty_in, buffer, sizeof(buffer));
 556         data = buffer;
 557
 558         /*
 559          *      Write the data from the dirty buffer (i.e. packet
 560          *      data) into the buffer which we will give to SSL for
 561          *      decoding.
 562          *
 563          *      Some of this code COULD technically go into the TLS
 564          *      module, in eaptls_process(), where it returns EAPTLS_OK.
 565          *
 566          *      Similarly, the writing of data to the SSL context could
 567          *      go there, too...
 568          */
 569         BIO_write(tls_session->into_ssl, buffer, data_len);
 570         (tls_session->record_init)(&tls_session->clean_out);
 571
 572         /*
 573          *      Read (and decrypt) the tunneled data from the SSL session,
 574          *      and put it into the decrypted data buffer.
 575          */
 576         err = SSL_read(tls_session->ssl, tls_session->clean_out.data,
 577                        sizeof(tls_session->clean_out.data));
 578         if (err < 0) {
 579                 /*
 580                  *      FIXME: Call SSL_get_error() to see what went
 581                  *      wrong.
 582                  */
 583                 radlog(L_INFO, "rlm_eap_peap: SSL_read Error");
 584                 return RLM_MODULE_REJECT;
 585         }
 586
 587         /*
 588          *      If there's no data, maybe this is an ACK to an
 589          *      MS-CHAP2-Success.
 590          */
 591         if (err == 0) {
 592                 /*
 593                  *      FIXME: Call SSL_get_error() to see what went
 594                  *      wrong.
 595                  */
 596                 radlog(L_INFO, "rlm_eap_peap: No data inside of the tunnel.");
 597                 return RLM_MODULE_REJECT;
 598         }
 599
 600         data_len = tls_session->clean_out.used = err;
 601         data = tls_session->clean_out.data;
 602
 603 #ifndef NDEBUG
 604         if (debug_flag > 2) {
 605                 for (i = 0; i < data_len; i++) {
 606                         if ((i & 0x0f) == 0) printf("  PEAP tunnel data in %04x: ", i);
 607
 608                         printf("%02x ", data[i]);
 609
 610                         if ((i & 0x0f) == 0x0f) printf("\n");
 611                 }
 612                 if ((data_len & 0x0f) != 0) printf("\n");
 613         }
 614 #endif
 615
 616         if (!eapmessage_verify(data, data_len)) {
 617                 return RLM_MODULE_REJECT;
 618         }
 619
 620         DEBUG2("  rlm_eap_peap: Tunneled data is valid.");
 621
 622         /*
 623          *      If we authenticated the user, then it's OK.
 624          */
 625         if (t->status == PEAP_STATUS_SENT_TLV_SUCCESS) {
 626                 if (eappeap_check_tlv(data)) {
 627                         DEBUG2("  rlm_eap_peap: Success");
 628                         return RLM_MODULE_OK;
 629                 }
 630
 631                 return RLM_MODULE_REJECT;
 632
 633         } else if (t->status == PEAP_STATUS_SENT_TLV_FAILURE) {
 634                 DEBUG2("  rlm_eap_peap:  Had sent TLV failure.  User was rejected earlier in this session.");
 635                 return RLM_MODULE_REJECT;
 636         }
 637
 638         fake = request_alloc_fake(request);
 639
 640         rad_assert(fake->packet->vps == NULL);
 641
 642         fake->packet->vps = eap2vp(eap_ds, data, data_len);
 643         if (!fake->packet->vps) {
 644                 request_free(&fake);
 645                 DEBUG2("  rlm_eap_peap: Unable to convert tunneled EAP packet to internal server data structures");
 646                 return PW_AUTHENTICATION_REJECT;
 647         }
 648
 649 #ifndef NDEBUG
 650         if (debug_flag > 0) {
 651           printf("  PEAP: Got tunneled EAP-Message\n");
 652
 653           for (vp = fake->packet->vps; vp != NULL; vp = vp->next) {
 654             putchar('\t');vp_print(stdout, vp);putchar('\n');
 655           }
 656         }
 657 #endif
 658
 659         /*
 660          *      Tell the request that it's a fake one.
 661          */
 662         vp = pairmake("Freeradius-Proxied-To", "127.0.0.1", T_OP_EQ);
 663         if (vp) {
 664                 pairadd(&fake->packet->vps, vp);
 665         }
 666
 667         /*
 668          *      Update other items in the REQUEST data structure.
 669          */
 670         if (!t->username) {
 671                 /*
 672                  *      There's no User-Name in the tunneled session,
 673                  *      so we add one here, by pulling it out of the
 674                  *      EAP-Identity packet.
 675                  */
 676                 if ((data[0] == PW_EAP_IDENTITY) && (data_len > 1)) {
 677                         t->username = pairmake("User-Name", "", T_OP_EQ);
 678                         rad_assert(t->username != NULL);
 679
 680                         memcpy(t->username->vp_strvalue, data + 1, data_len - 1);
 681                         t->username->length = data_len - 1;
 682                         t->username->vp_strvalue[t->username->length] = 0;
 683                         DEBUG2("  PEAP: Got tunneled identity of %s", t->username->vp_strvalue);
 684
 685                         /*
 686                          *      If there's a default EAP type,
 687                          *      set it here.
 688                          */
 689                         if (t->default_eap_type != 0) {
 690                                 DEBUG2("  PEAP: Setting default EAP type for tunneled EAP session.");
 691                                 vp = pairmake("EAP-Type", "0", T_OP_EQ);
 692                                 vp->vp_integer = t->default_eap_type;
 693                                 pairadd(&fake->config_items, vp);
 694                         }
 695                 }
 696         } /* else there WAS a t->username */
 697
 698         if (t->username) {
 699                 vp = paircopy(t->username);
 700                 pairadd(&fake->packet->vps, vp);
 701                 fake->username = pairfind(fake->packet->vps, PW_USER_NAME);
 702                 DEBUG2("  PEAP: Setting User-Name to %s",
 703                        fake->username->vp_strvalue);
 704         }
 705
 706         /*
 707          *      Add the State attribute, too, if it exists.
 708          */
 709         if (t->state) {
 710                 DEBUG2("  PEAP: Adding old state with %02x %02x",
 711                        t->state->vp_strvalue[0], t->state->vp_strvalue[1]);
 712                 vp = paircopy(t->state);
 713                 if (vp) pairadd(&fake->packet->vps, vp);
 714         }
 715
 716         /*
 717          *      If this is set, we copy SOME of the request attributes
 718          *      from outside of the tunnel to inside of the tunnel.
 719          *
 720          *      We copy ONLY those attributes which do NOT already
 721          *      exist in the tunneled request.
 722          *
 723          *      This code is copied from ../rlm_eap_ttls/ttls.c
 724          */
 725         if (t->copy_request_to_tunnel) {
 726                 VALUE_PAIR *copy;
 727
 728                 for (vp = request->packet->vps; vp != NULL; vp = vp->next) {
 729                         /*
 730                          *      The attribute is a server-side thingy,
 731                          *      don't copy it.
 732                          */
 733                         if ((vp->attribute > 255) &&
 734                             (((vp->attribute >> 16) & 0xffff) == 0)) {
 735                                 continue;
 736                         }
 737
 738                         /*
 739                          *      The outside attribute is already in the
 740                          *      tunnel, don't copy it.
 741                          *
 742                          *      This works for BOTH attributes which
 743                          *      are originally in the tunneled request,
 744                          *      AND attributes which are copied there
 745                          *      from below.
 746                          */
 747                         if (pairfind(fake->packet->vps, vp->attribute)) {
 748                                 continue;
 749                         }
 750
 751                         /*
 752                          *      Some attributes are handled specially.
 753                          */
 754                         switch (vp->attribute) {
 755                                 /*
 756                                  *      NEVER copy Message-Authenticator,
 757                                  *      EAP-Message, or State.  They're
 758                                  *      only for outside of the tunnel.
 759                                  */
 760                         case PW_USER_NAME:
 761                         case PW_USER_PASSWORD:
 762                         case PW_CHAP_PASSWORD:
 763                         case PW_CHAP_CHALLENGE:
 764                         case PW_PROXY_STATE:
 765                         case PW_MESSAGE_AUTHENTICATOR:
 766                         case PW_EAP_MESSAGE:
 767                         case PW_STATE:
 768                                 continue;
 769                                 break;
 770
 771                                 /*
 772                                  *      By default, copy it over.
 773                                  */
 774                         default:
 775                                 break;
 776                         }
 777
 778                         /*
 779                          *      Don't copy from the head, we've already
 780                          *      checked it.
 781                          */
 782                         copy = paircopy2(vp, vp->attribute);
 783                         pairadd(&fake->packet->vps, copy);
 784                 }
 785         }
 786
 787         if ((vp = pairfind(request->config_items, PW_VIRTUAL_SERVER)) != NULL) {
 788                 fake->server = vp->vp_strvalue;
 789
 790         } else if (t->virtual_server) {
 791                 fake->server = t->virtual_server;
 792
 793         } /* else fake->server == request->server */
 794
 795 #ifndef NDEBUG
 796         if (debug_flag > 0) {
 797                 printf("  PEAP: Sending tunneled request\n");
 798
 799                 for (vp = fake->packet->vps; vp != NULL; vp = vp->next) {
 800                         putchar('\t');vp_print(stdout, vp);putchar('\n');
 801                 }
 802
 803                 printf("server %s {\n", fake->server);
 804         }
 805 #endif
 806
 807         /*
 808          *      Call authentication recursively, which will
 809          *      do PAP, CHAP, MS-CHAP, etc.
 810          */
 811         rad_authenticate(fake);
 812
 813         /*
 814          *      Note that we don't do *anything* with the reply
 815          *      attributes.
 816          */
 817 #ifndef NDEBUG
 818         if (debug_flag > 0) {
 819                 printf("} # server %s\n", fake->server);
 820
 821                 printf("  PEAP: Got tunneled reply RADIUS code %d\n",
 822                  fake->reply->code);
 823
 824                 for (vp = fake->reply->vps; vp != NULL; vp = vp->next) {
 825                         putchar('\t');vp_print(stdout, vp);putchar('\n');
 826                 }
 827         }
 828 #endif
 829
 830         /*
 831          *      Decide what to do with the reply.
 832          */
 833         switch (fake->reply->code) {
 834         case 0:                 /* No reply code, must be proxied... */
 835                 vp = pairfind(fake->config_items, PW_PROXY_TO_REALM);
 836
 837                 if (vp) {
 838                         eap_tunnel_data_t *tunnel;
 839
 840                         /*
 841                          *      The tunneled request was NOT handled,
 842                          *      it has to be proxied.  This means that
 843                          *      the "authenticate" stage was never
 844                          *      performed.
 845                          *
 846                          *      If we are told to NOT proxy the
 847                          *      tunneled request as EAP, then this
 848                          *      means that we've got to decode it,
 849                          *      which means that we MUST run the
 850                          *      "authenticate" portion by hand, here.
 851                          *
 852                          *      Once the tunneled EAP session is ALMOST
 853                          *      done, THEN we proxy it...
 854                          */
 855                         if (!t->proxy_tunneled_request_as_eap) {
 856                                 fake->options |= RAD_REQUEST_OPTION_PROXY_EAP;
 857
 858                                 /*
 859                                  *      Hmm... should we check for
 860                                  *      Auth-Type & EAP-Message here?
 861                                  */
 862
 863
 864                                 /*
 865                                  *      Run the EAP authentication.
 866                                  */
 867                                 DEBUG2("  PEAP: Calling authenticate in order to initiate tunneled EAP session.");
 868                                 rcode = module_authenticate(PW_AUTHTYPE_EAP, fake);
 869                                 if (rcode == RLM_MODULE_OK) {
 870                                         /*
 871                                          *      Authentication succeeded! Rah!
 872                                          */
 873                                         fake->reply->code = PW_AUTHENTICATION_ACK;
 874                                         goto do_process;
 875                                 }
 876
 877                                 if (rcode != RLM_MODULE_HANDLED) {
 878                                         DEBUG2("  PEAP: Can't handle the return code %d", rcode);
 879                                         rcode = RLM_MODULE_REJECT;
 880                                         goto done;
 881                                 }
 882
 883                                 /*
 884                                  *      The module decided it wasn't
 885                                  *      done.  Handle it like normal.
 886                                  */
 887                                 if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) == 0) {
 888                                         DEBUG2("    PEAP: Cancelling proxy to realm %s until the tunneled EAP session has been established", vp->vp_strvalue);
 889                                         goto do_process;
 890                                 }
 891
 892                                 /*
 893                                  *      The module has decoded the
 894                                  *      EAP-Message into another set
 895                                  *      of attributes.
 896                                  */
 897                                 pairdelete(&fake->packet->vps,
 898                                            PW_EAP_MESSAGE);
 899                         }
 900
 901                         DEBUG2("  PEAP: Tunneled authentication will be proxied to %s", vp->vp_strvalue);
 902
 903                         /*
 904                          *      Tell the original request that it's going
 905                          *      to be proxied.
 906                          */
 907                         pairmove2(&(request->config_items),
 908                                   &(fake->config_items),
 909                                   PW_PROXY_TO_REALM);
 910
 911                         /*
 912                          *      Seed the proxy packet with the
 913                          *      tunneled request.
 914                          */
 915                         rad_assert(request->proxy == NULL);
 916                         request->proxy = fake->packet;
 917                         fake->packet = NULL;
 918                         rad_free(&fake->reply);
 919                         fake->reply = NULL;
 920
 921                         /*
 922                          *      Set up the callbacks for the tunnel
 923                          */
 924                         tunnel = rad_malloc(sizeof(*tunnel));
 925                         memset(tunnel, 0, sizeof(*tunnel));
 926
 927                         tunnel->tls_session = tls_session;
 928                         tunnel->callback = eappeap_postproxy;
 929
 930                         /*
 931                          *      Associate the callback with the request.
 932                          */
 933                         rcode = request_data_add(request,
 934                                                  request->proxy,
 935                                                  REQUEST_DATA_EAP_TUNNEL_CALLBACK,
 936                                                  tunnel, free);
 937                         rad_assert(rcode == 0);
 938
 939                         /*
 940                          *      We're not proxying it as EAP, so we've got
 941                          *      to do the callback later.
 942                          */
 943                         if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) != 0) {
 944                                 DEBUG2("  PEAP: Remembering to do EAP-MS-CHAP-V2 post-proxy.");
 945
 946                                 /*
 947                                  *      rlm_eap.c has taken care of associating
 948                                  *      the handler with the fake request.
 949                                  *
 950                                  *      So we associate the fake request with
 951                                  *      this request.
 952                                  */
 953                                 rcode = request_data_add(request,
 954                                                          request->proxy,
 955                                                          REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK,
 956                                                          fake, my_request_free);
 957                                 rad_assert(rcode == 0);
 958
 959                                 /*
 960                                  *      Do NOT free the fake request!
 961                                  */
 962                                 return RLM_MODULE_UPDATED;
 963                         }
 964
 965                         /*
 966                          *      Didn't authenticate the packet, but
 967                          *      we're proxying it.
 968                          */
 969                         rcode = RLM_MODULE_UPDATED;
 970
 971                 } else {
 972                         DEBUG2("  PEAP: Unknown RADIUS packet type %d: rejecting tunneled user", fake->reply->code);
 973                         rcode = RLM_MODULE_REJECT;
 974                 }
 975                 break;
 976
 977         default:
 978         do_process:
 979                 rcode = process_reply(handler, tls_session, request,
 980                                       fake->reply);
 981                 break;
 982         }
 983
 984  done:
 985         request_free(&fake);
 986
 987         return rcode;
 988 }