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