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 static int setup_fake_request(REQUEST *request, REQUEST *fake, peap_tunnel_t *t);
  30
  31 /*
  32  *      Send protected EAP-Failure
  33  *
  34  *       Result-TLV = Failure
  35  */
  36 static int eappeap_failure(eap_handler_t *handler, tls_session_t *tls_session)
  37 {
  38         uint8_t tlv_packet[11];
  39         REQUEST *request = handler->request;
  40
  41         RDEBUG2("FAILURE");
  42
  43         tlv_packet[0] = PW_EAP_REQUEST;
  44         tlv_packet[1] = handler->eap_ds->response->id +1;
  45         tlv_packet[2] = 0;
  46         tlv_packet[3] = 11;     /* length of this packet */
  47         tlv_packet[4] = PW_EAP_TLV;
  48         tlv_packet[5] = 0x80;
  49         tlv_packet[6] = EAP_TLV_ACK_RESULT;
  50         tlv_packet[7] = 0;
  51         tlv_packet[8] = 2;      /* length of the data portion */
  52         tlv_packet[9] = 0;
  53         tlv_packet[10] = EAP_TLV_FAILURE;
  54
  55         (tls_session->record_plus)(&tls_session->clean_in, tlv_packet, 11);
  56
  57         /*
  58          *      FIXME: Check the return code.
  59          */
  60         tls_handshake_send(request, tls_session);
  61
  62         return 1;
  63 }
  64
  65
  66 /*
  67  *      Send protected EAP-Success
  68  *
  69  *       Result-TLV = Success
  70  */
  71 static int eappeap_success(eap_handler_t *handler, tls_session_t *tls_session)
  72 {
  73         uint8_t tlv_packet[11];
  74         REQUEST *request = handler->request;
  75
  76         RDEBUG2("SUCCESS");
  77
  78         tlv_packet[0] = PW_EAP_REQUEST;
  79         tlv_packet[1] = handler->eap_ds->response->id +1;
  80         tlv_packet[2] = 0;
  81         tlv_packet[3] = 11;     /* length of this packet */
  82         tlv_packet[4] = PW_EAP_TLV;
  83         tlv_packet[5] = 0x80;   /* mandatory AVP */
  84         tlv_packet[6] = EAP_TLV_ACK_RESULT;
  85         tlv_packet[7] = 0;
  86         tlv_packet[8] = 2;      /* length of the data portion */
  87         tlv_packet[9] = 0;
  88         tlv_packet[10] = EAP_TLV_SUCCESS;
  89
  90         (tls_session->record_plus)(&tls_session->clean_in, tlv_packet, 11);
  91
  92         /*
  93          *      FIXME: Check the return code.
  94          */
  95         tls_handshake_send(request, tls_session);
  96
  97         return 1;
  98 }
  99
 100
 101 static int eappeap_identity(eap_handler_t *handler, tls_session_t *tls_session)
 102 {
 103         eap_packet_raw_t eap_packet;
 104
 105         eap_packet.code = PW_EAP_REQUEST;
 106         eap_packet.id = handler->eap_ds->response->id + 1;
 107         eap_packet.length[0] = 0;
 108         eap_packet.length[1] = EAP_HEADER_LEN + 1;
 109         eap_packet.data[0] = PW_EAP_IDENTITY;
 110
 111         (tls_session->record_plus)(&tls_session->clean_in,
 112                                   &eap_packet, sizeof(eap_packet));
 113
 114         tls_handshake_send(handler->request, tls_session);
 115         (tls_session->record_init)(&tls_session->clean_in);
 116
 117         return 1;
 118 }
 119
 120 /*
 121  * Send an MS SoH request
 122  */
 123 static int eappeap_soh(eap_handler_t *handler, tls_session_t *tls_session)
 124 {
 125         uint8_t tlv_packet[20];
 126
 127         tlv_packet[0] = 254;    /* extended type */
 128
 129         tlv_packet[1] = 0;
 130         tlv_packet[2] = 0x01;   /* ms vendor */
 131         tlv_packet[3] = 0x37;
 132
 133         tlv_packet[4] = 0;      /* ms soh eap */
 134         tlv_packet[5] = 0;
 135         tlv_packet[6] = 0;
 136         tlv_packet[7] = 0x21;
 137
 138         tlv_packet[8] = 0;      /* vendor-spec tlv */
 139         tlv_packet[9] = 7;
 140
 141         tlv_packet[10] = 0;
 142         tlv_packet[11] = 8;     /* payload len */
 143
 144         tlv_packet[12] = 0;     /* ms vendor */
 145         tlv_packet[13] = 0;
 146         tlv_packet[14] = 0x01;
 147         tlv_packet[15] = 0x37;
 148
 149         tlv_packet[16] = 0;
 150         tlv_packet[17] = 2;
 151         tlv_packet[18] = 0;
 152         tlv_packet[19] = 0;
 153
 154         (tls_session->record_plus)(&tls_session->clean_in, tlv_packet, 20);
 155         tls_handshake_send(handler->request, tls_session);
 156         return 1;
 157 }
 158
 159 static void eapsoh_verify(REQUEST *request, RADIUS_PACKET *packet,
 160                           const uint8_t *data, unsigned int data_len) {
 161
 162         VALUE_PAIR *vp;
 163         uint8_t eap_method_base;
 164         uint32_t eap_vendor;
 165         uint32_t eap_method;
 166         int rv;
 167
 168         vp = pairmake(packet, &packet->vps, "SoH-Supported", "no", T_OP_EQ);
 169         if (data && data[0] == PW_EAP_NAK) {
 170                 RDEBUG("SoH - client NAKed");
 171                 return;
 172         }
 173
 174         if (!data || data_len < 8) {
 175                 RDEBUG("SoH - eap payload too short");
 176                 return;
 177         }
 178
 179         eap_method_base = *data++;
 180         if (eap_method_base != 254) {
 181                 RDEBUG("SoH - response is not extended EAP: %i", eap_method_base);
 182                 return;
 183         }
 184
 185         eap_vendor = soh_pull_be_24(data); data += 3;
 186         if (eap_vendor != 0x137) {
 187                 RDEBUG("SoH - extended eap vendor %08x is not Microsoft", eap_vendor);
 188                 return;
 189         }
 190
 191         eap_method = soh_pull_be_32(data); data += 4;
 192         if (eap_method != 0x21) {
 193                 RDEBUG("SoH - response eap type %08x is not EAP-SoH", eap_method);
 194                 return;
 195         }
 196
 197
 198         rv = soh_verify(request, data, data_len - 8);
 199         if (rv<0) {
 200                 RDEBUG("SoH - error decoding payload: %s", fr_strerror());
 201         } else {
 202                 vp->vp_integer = 1;
 203         }
 204 }
 205
 206 /*
 207  *      Verify the tunneled EAP message.
 208  */
 209 static int eapmessage_verify(REQUEST *request,
 210                              const uint8_t *data, unsigned int data_len)
 211 {
 212         const eap_packet_raw_t *eap_packet = (const eap_packet_raw_t *) data;
 213         eap_type_t eap_method;
 214
 215         /*
 216          *      No data, OR only 1 byte of EAP type.
 217          */
 218         if (!data || (data_len == 0) ||
 219             ((data_len <= 1) && (data[0] != PW_EAP_IDENTITY))) {
 220                 return 0;
 221         }
 222
 223         eap_method = *data;
 224         switch (eap_method) {
 225         case PW_EAP_IDENTITY:
 226                 if (data_len == 1) {
 227                         RDEBUG2("Identity - ");
 228                         return 1;
 229                 }
 230                 RDEBUG2("Identity - %*s",
 231                        data_len - 1, data + 1);
 232                 return 1;
 233                 break;
 234
 235                 /*
 236                  *      If the first byte of the packet is
 237                  *      EAP-Response, and the EAP data is a TLV,
 238                  *      then it looks OK...
 239                  */
 240         case PW_EAP_RESPONSE:
 241                 if (eap_packet->data[0] == PW_EAP_TLV) {
 242                         RDEBUG2("Received EAP-TLV response.");
 243                         return 1;
 244                 }
 245                 RDEBUG2("Got something weird.");
 246                 break;
 247
 248
 249                 /*
 250                  *      We normally do Microsoft MS-CHAPv2 (26), versus
 251                  *      Cisco MS-CHAPv2 (29).
 252                  */
 253         case PW_EAP_MSCHAPV2:
 254         default:
 255                 RDEBUG2("EAP type %s (%d)", eap_type2name(eap_method),
 256                         eap_method);
 257                 return 1;
 258                 break;
 259         }
 260
 261         return 0;
 262 }
 263
 264 /*
 265  *      Convert a pseudo-EAP packet to a list of VALUE_PAIR's.
 266  */
 267 static VALUE_PAIR *eap2vp(REQUEST *request, RADIUS_PACKET *packet,
 268                           EAP_DS *eap_ds,
 269                           const uint8_t *data, size_t data_len)
 270 {
 271         size_t total;
 272         VALUE_PAIR *vp = NULL, *head, **tail;
 273
 274         if (data_len > 65535) return NULL; /* paranoia */
 275
 276         vp = paircreate(packet, PW_EAP_MESSAGE, 0);
 277         if (!vp) {
 278                 RDEBUG2("Failure in creating VP");
 279                 return NULL;
 280         }
 281
 282         total = data_len;
 283         if (total > 249) total = 249;
 284
 285         /*
 286          *      Hand-build an EAP packet from the crap in PEAP version 0.
 287          */
 288         vp->vp_octets[0] = PW_EAP_RESPONSE;
 289         vp->vp_octets[1] = eap_ds->response->id;
 290         vp->vp_octets[2] = (data_len + EAP_HEADER_LEN) >> 8;
 291         vp->vp_octets[3] = (data_len + EAP_HEADER_LEN) & 0xff;
 292
 293         memcpy(vp->vp_octets + EAP_HEADER_LEN, data, total);
 294         vp->length = EAP_HEADER_LEN + total;
 295
 296         head = vp;
 297         tail = &(vp->next);
 298         while (total < data_len) {
 299                 int vp_len;
 300
 301
 302                 vp = paircreate(packet, PW_EAP_MESSAGE, 0);
 303                 if (!vp) {
 304                         RDEBUG2("Failure in creating VP");
 305                         pairfree(&head);
 306                         return NULL;
 307                 }
 308                 vp_len = (data_len - total);
 309                 if (vp_len > 253) vp_len = 253;
 310
 311                 memcpy(vp->vp_octets, data + total, vp_len);
 312                 vp->length = vp_len;
 313
 314                 total += vp_len;
 315                 *tail = vp;
 316                 tail = &(vp->next);
 317         }
 318
 319         return head;
 320 }
 321
 322
 323 /*
 324  *      Convert a list of VALUE_PAIR's to an EAP packet, through the
 325  *      simple expedient of dumping the EAP message
 326  */
 327 static int vp2eap(REQUEST *request, tls_session_t *tls_session, VALUE_PAIR *vp)
 328 {
 329         rad_assert(vp != NULL);
 330
 331         /*
 332          *      Skip the id, code, and length.  Just write the EAP
 333          *      type & data to the client.
 334          */
 335 #ifndef NDEBUG
 336         if ((debug_flag > 2) && fr_log_fp) {
 337                 size_t i, total;
 338                 VALUE_PAIR *this;
 339
 340                 total = 0;
 341
 342                 for (this = vp; this != NULL; this = this->next) {
 343                         int start = 0;
 344
 345                         if (this == vp) start = EAP_HEADER_LEN;
 346
 347                         for (i = start; i < vp->length; i++) {
 348                           if ((total & 0x0f) == 0) fprintf(fr_log_fp, "  PEAP tunnel data out %04x: ", (int) total);
 349
 350                                 fprintf(fr_log_fp, "%02x ", vp->vp_octets[i]);
 351
 352                                 if ((total & 0x0f) == 0x0f) fprintf(fr_log_fp, "\n");
 353                                 total++;
 354                         }
 355                 }
 356                 if ((total & 0x0f) != 0) fprintf(fr_log_fp, "\n");
 357         }
 358 #endif
 359
 360         /*
 361          *      Send the EAP data, WITHOUT the header.
 362          */
 363         (tls_session->record_plus)(&tls_session->clean_in,
 364                                    vp->vp_octets + EAP_HEADER_LEN,
 365                                    vp->length - EAP_HEADER_LEN);
 366
 367         /*
 368          *      Send the rest of the EAP data.
 369          */
 370         for (vp = vp->next; vp != NULL; vp = vp->next) {
 371                 (tls_session->record_plus)(&tls_session->clean_in,
 372                                            vp->vp_octets, vp->length);
 373         }
 374
 375         tls_handshake_send(request, tls_session);
 376
 377         return 1;
 378 }
 379
 380
 381 /*
 382  *      See if there's a TLV in the response.
 383  */
 384 static int eappeap_check_tlv(REQUEST *request, const uint8_t *data,
 385                              size_t data_len)
 386 {
 387         const eap_packet_raw_t *eap_packet = (const eap_packet_raw_t *) data;
 388
 389         if (data_len < 11) return 0;
 390
 391         /*
 392          *      Look for success or failure.
 393          */
 394         if ((eap_packet->code == PW_EAP_RESPONSE) &&
 395             (eap_packet->data[0] == PW_EAP_TLV)) {
 396                 if (data[10] == EAP_TLV_SUCCESS) {
 397                         return 1;
 398                 }
 399
 400                 if (data[10] == EAP_TLV_FAILURE) {
 401                         RDEBUG2("Client rejected our response.  The password is probably incorrect.");
 402                         return 0;
 403                 }
 404         }
 405
 406         RDEBUG("Unknown TLV %02x", data[10]);
 407
 408         return 0;
 409 }
 410
 411
 412 /*
 413  *      Use a reply packet to determine what to do.
 414  */
 415 static int process_reply(eap_handler_t *handler, tls_session_t *tls_session,
 416                          REQUEST *request, RADIUS_PACKET *reply)
 417 {
 418         int rcode = RLM_MODULE_REJECT;
 419         VALUE_PAIR *vp;
 420         peap_tunnel_t *t = tls_session->opaque;
 421
 422         if ((debug_flag > 0) && fr_log_fp) {
 423                 RDEBUG("Got tunneled reply RADIUS code %d",
 424                        reply->code);
 425
 426                 debug_pair_list(reply->vps);
 427         }
 428
 429         switch (reply->code) {
 430         case PW_AUTHENTICATION_ACK:
 431                 RDEBUG2("Tunneled authentication was successful.");
 432                 t->status = PEAP_STATUS_SENT_TLV_SUCCESS;
 433                 eappeap_success(handler, tls_session);
 434                 rcode = RLM_MODULE_HANDLED;
 435
 436                 /*
 437                  *      If we've been told to use the attributes from
 438                  *      the reply, then do so.
 439                  *
 440                  *      WARNING: This may leak information about the
 441                  *      tunneled user!
 442                  */
 443                 if (t->use_tunneled_reply) {
 444                         RDEBUG2("Saving tunneled attributes for later");
 445
 446                         /*
 447                          *      Clean up the tunneled reply.
 448                          */
 449                         pairdelete(&reply->vps, PW_PROXY_STATE, 0, TAG_ANY);
 450                         pairdelete(&reply->vps, PW_EAP_MESSAGE, 0, TAG_ANY);
 451                         pairdelete(&reply->vps, PW_MESSAGE_AUTHENTICATOR, 0, TAG_ANY);
 452
 453                         /*
 454                          *      Delete MPPE keys & encryption policy.  We don't
 455                          *      want these here.
 456                          */
 457                         pairdelete(&reply->vps, 7, VENDORPEC_MICROSOFT, TAG_ANY);
 458                         pairdelete(&reply->vps, 8, VENDORPEC_MICROSOFT, TAG_ANY);
 459                         pairdelete(&reply->vps, 16, VENDORPEC_MICROSOFT, TAG_ANY);
 460                         pairdelete(&reply->vps, 17, VENDORPEC_MICROSOFT, TAG_ANY);
 461
 462                         t->accept_vps = reply->vps;
 463                         reply->vps = NULL;
 464                 }
 465                 break;
 466
 467         case PW_AUTHENTICATION_REJECT:
 468                 RDEBUG2("Tunneled authentication was rejected.");
 469                 t->status = PEAP_STATUS_SENT_TLV_FAILURE;
 470                 eappeap_failure(handler, tls_session);
 471                 rcode = RLM_MODULE_HANDLED;
 472                 break;
 473
 474         case PW_ACCESS_CHALLENGE:
 475                 RDEBUG2("Got tunneled Access-Challenge");
 476
 477                 /*
 478                  *      Keep the State attribute, if necessary.
 479                  *
 480                  *      Get rid of the old State, too.
 481                  */
 482                 pairfree(&t->state);
 483                 pairmove2(&t->state, &(reply->vps), PW_STATE, 0, TAG_ANY);
 484
 485                 /*
 486                  *      PEAP takes only EAP-Message attributes inside
 487                  *      of the tunnel.  Any Reply-Message in the
 488                  *      Access-Challenge is ignored.
 489                  */
 490                 vp = NULL;
 491                 pairmove2(&vp, &(reply->vps), PW_EAP_MESSAGE, 0, TAG_ANY);
 492
 493                 /*
 494                  *      Handle EAP-MSCHAP-V2, where Access-Accept's
 495                  *      from the home server may contain MS-CHAP-Success,
 496                  *      which the module turns into challenges, so that
 497                  *      the client may respond to the challenge with
 498                  *      an "ack" packet.
 499                  */
 500                 if (t->home_access_accept && t->use_tunneled_reply) {
 501                         RDEBUG2("Saving tunneled attributes for later");
 502
 503                         /*
 504                          *      Clean up the tunneled reply.
 505                          */
 506                         pairdelete(&reply->vps, PW_PROXY_STATE, 0, TAG_ANY);
 507                         pairdelete(&reply->vps, PW_MESSAGE_AUTHENTICATOR, 0, TAG_ANY);
 508
 509                         t->accept_vps = reply->vps;
 510                         reply->vps = NULL;
 511                 }
 512
 513                 /*
 514                  *      Handle the ACK, by tunneling any necessary reply
 515                  *      VP's back to the client.
 516                  */
 517                 if (vp) {
 518                         vp2eap(request, tls_session, vp);
 519                         pairfree(&vp);
 520                 }
 521
 522                 rcode = RLM_MODULE_HANDLED;
 523                 break;
 524
 525         default:
 526                 RDEBUG2("Unknown RADIUS packet type %d: rejecting tunneled user", reply->code);
 527                 rcode = RLM_MODULE_REJECT;
 528                 break;
 529         }
 530
 531         return rcode;
 532 }
 533
 534 #ifdef WITH_PROXY
 535 /*
 536  *      Do post-proxy processing,
 537  */
 538 static int eappeap_postproxy(eap_handler_t *handler, void *data)
 539 {
 540         int rcode;
 541         tls_session_t *tls_session = (tls_session_t *) data;
 542         REQUEST *fake, *request = handler->request;
 543
 544         rad_assert(request != NULL);
 545         RDEBUG2("Passing reply from proxy back into the tunnel.");
 546
 547         /*
 548          *      If there was a fake request associated with the proxied
 549          *      request, do more processing of it.
 550          */
 551         fake = (REQUEST *) request_data_get(handler->request,
 552                                             handler->request->proxy,
 553                                             REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK);
 554
 555         /*
 556          *      Do the callback, if it exists, and if it was a success.
 557          */
 558         if (fake && (handler->request->proxy_reply->code == PW_AUTHENTICATION_ACK)) {
 559                 peap_tunnel_t *t = tls_session->opaque;
 560
 561                 t->home_access_accept = TRUE;
 562
 563                 /*
 564                  *      Terrible hacks.
 565                  */
 566                 rad_assert(fake->packet == NULL);
 567                 fake->packet = request->proxy;
 568                 fake->packet->src_ipaddr = request->packet->src_ipaddr;
 569                 request->proxy = NULL;
 570
 571                 rad_assert(fake->reply == NULL);
 572                 fake->reply = request->proxy_reply;
 573                 request->proxy_reply = NULL;
 574
 575                 if ((debug_flag > 0) && fr_log_fp) {
 576                         fprintf(fr_log_fp, "server %s {\n", fake->server);
 577                 }
 578
 579                 /*
 580                  *      Perform a post-auth stage, which will get the EAP
 581                  *      handler, too...
 582                  */
 583                 fake->options &= ~RAD_REQUEST_OPTION_PROXY_EAP;
 584                 RDEBUG2("Passing reply back for EAP-MS-CHAP-V2");
 585                 process_post_proxy(0, fake);
 586
 587                 /*
 588                  *      FIXME: If rcode returns fail, do something
 589                  *      intelligent...
 590                  */
 591                 rcode = mod_post_auth(fake);
 592
 593                 if ((debug_flag > 0) && fr_log_fp) {
 594                         fprintf(fr_log_fp, "} # server %s\n", fake->server);
 595
 596                         RDEBUG("Final reply from tunneled session code %d",
 597                                fake->reply->code);
 598
 599                         debug_pair_list(fake->reply->vps);
 600                 }
 601
 602                 /*
 603                  *      Terrible hacks.
 604                  */
 605                 request->proxy = fake->packet;
 606                 fake->packet = NULL;
 607                 request->proxy_reply = fake->reply;
 608                 fake->reply = NULL;
 609
 610                 /*
 611                  *      And we're done with this request.
 612                  */
 613
 614                 switch (rcode) {
 615                 case RLM_MODULE_FAIL:
 616                         request_free(&fake);
 617                         eaptls_fail(handler, 0);
 618                         return 0;
 619                         break;
 620
 621                 default:  /* Don't Do Anything */
 622                         RDEBUG2("Got reply %d", request->proxy_reply->code);
 623                         break;
 624                 }
 625         }
 626         request_free(&fake);    /* robust if fake == NULL */
 627
 628         /*
 629          *      If there was no EAP-Message in the reply packet, then
 630          *      we know that we're supposed to re-run the "authenticate"
 631          *      stage, in order to get the right kind of handling...
 632          */
 633
 634         /*
 635          *      Process the reply from the home server.
 636          */
 637
 638         rcode = process_reply(handler, tls_session, handler->request,
 639                               handler->request->proxy_reply);
 640
 641         /*
 642          *      The proxy code uses the reply from the home server as
 643          *      the basis for the reply to the NAS.  We don't want that,
 644          *      so we toss it, after we've had our way with it.
 645          */
 646         pairfree(&handler->request->proxy_reply->vps);
 647
 648         switch (rcode) {
 649         case RLM_MODULE_REJECT:
 650                 RDEBUG2("Reply was rejected");
 651                 eaptls_fail(handler, 0);
 652                 return 0;
 653
 654         case RLM_MODULE_HANDLED:
 655                 RDEBUG2("Reply was handled");
 656                 eaptls_request(handler->eap_ds, tls_session);
 657                 return 1;
 658
 659         case RLM_MODULE_OK:
 660                 RDEBUG2("Reply was OK");
 661
 662                 /*
 663                  *      Success: Automatically return MPPE keys.
 664                  */
 665                 return eaptls_success(handler, 0);
 666
 667         default:
 668                 RDEBUG2("Reply was unknown.");
 669                 break;
 670         }
 671
 672         eaptls_fail(handler, 0);
 673         return 0;
 674 }
 675
 676 /*
 677  *      Free a request.
 678  */
 679 static void my_request_free(void *data)
 680 {
 681         REQUEST *request = (REQUEST *)data;
 682
 683         request_free(&request);
 684 }
 685 #endif
 686
 687
 688 static const char *peap_state(peap_tunnel_t *t)
 689 {
 690         switch (t->status) {
 691                 case PEAP_STATUS_TUNNEL_ESTABLISHED:
 692                         return "TUNNEL ESTABLISHED";
 693                 case PEAP_STATUS_WAIT_FOR_SOH_RESPONSE:
 694                         return "WAITING FOR SOH RESPONSE";
 695                 case PEAP_STATUS_INNER_IDENTITY_REQ_SENT:
 696                         return "WAITING FOR INNER IDENTITY";
 697                 case PEAP_STATUS_SENT_TLV_SUCCESS:
 698                         return "send tlv success";
 699                 case PEAP_STATUS_SENT_TLV_FAILURE:
 700                         return "send tlv failure";
 701                 case PEAP_STATUS_PHASE2_INIT:
 702                         return "phase2_init";
 703                 case PEAP_STATUS_PHASE2:
 704                         return "phase2";
 705                 default:
 706                         break;
 707         }
 708         return "?";
 709 }
 710
 711 static void print_tunneled_data(const uint8_t *data, size_t data_len)
 712 {
 713         size_t i;
 714
 715         if ((debug_flag > 2) && fr_log_fp) {
 716                 for (i = 0; i < data_len; i++) {
 717                   if ((i & 0x0f) == 0) fprintf(fr_log_fp, "  PEAP tunnel data in %02x: ", (int) i);
 718
 719                         fprintf(fr_log_fp, "%02x ", data[i]);
 720
 721                         if ((i & 0x0f) == 0x0f) fprintf(fr_log_fp, "\n");
 722                 }
 723                 if ((data_len & 0x0f) != 0) fprintf(fr_log_fp, "\n");
 724         }
 725 }
 726
 727
 728 /*
 729  *      Process the pseudo-EAP contents of the tunneled data.
 730  */
 731 int eappeap_process(eap_handler_t *handler, tls_session_t *tls_session)
 732 {
 733         peap_tunnel_t *t = tls_session->opaque;
 734         REQUEST *fake;
 735         VALUE_PAIR *vp;
 736         int rcode = RLM_MODULE_REJECT;
 737         const uint8_t   *data;
 738         unsigned int data_len;
 739
 740         REQUEST *request = handler->request;
 741         EAP_DS *eap_ds = handler->eap_ds;
 742
 743         rad_assert(request != NULL);
 744
 745         /*
 746          *      Just look at the buffer directly, without doing
 747          *      record_minus.  This lets us avoid another data copy.
 748          */
 749         data_len = tls_session->clean_out.used;
 750         tls_session->clean_out.used = 0;
 751         data = tls_session->clean_out.data;
 752
 753         RDEBUG2("Peap state %s", peap_state(t));
 754
 755         if ((t->status != PEAP_STATUS_TUNNEL_ESTABLISHED) &&
 756             !eapmessage_verify(request, data, data_len)) {
 757                 RDEBUG2("FAILED processing PEAP: Tunneled data is invalid.");
 758                 if (debug_flag > 2) print_tunneled_data(data, data_len);
 759                 return RLM_MODULE_REJECT;
 760         }
 761
 762         switch (t->status) {
 763         case PEAP_STATUS_TUNNEL_ESTABLISHED:
 764                 /* FIXME: should be no data in the buffer here, check & assert? */
 765
 766                 if (SSL_session_reused(tls_session->ssl)) {
 767                         RDEBUG2("Skipping Phase2 because of session resumption");
 768                         t->session_resumption_state = PEAP_RESUMPTION_YES;
 769                         if (t->soh) {
 770                                 t->status = PEAP_STATUS_WAIT_FOR_SOH_RESPONSE;
 771                                 RDEBUG2("Requesting SoH from client");
 772                                 eappeap_soh(handler, tls_session);
 773                                 return RLM_MODULE_HANDLED;
 774                         }
 775                         /* we're good, send success TLV */
 776                         t->status = PEAP_STATUS_SENT_TLV_SUCCESS;
 777                         eappeap_success(handler, tls_session);
 778
 779                 } else {
 780                         /* send an identity request */
 781                         t->session_resumption_state = PEAP_RESUMPTION_NO;
 782                         t->status = PEAP_STATUS_INNER_IDENTITY_REQ_SENT;
 783                         eappeap_identity(handler, tls_session);
 784                 }
 785                 return RLM_MODULE_HANDLED;
 786
 787         case PEAP_STATUS_INNER_IDENTITY_REQ_SENT:
 788                 /* we're expecting an identity response */
 789                 if (data[0] != PW_EAP_IDENTITY) {
 790                         RDEBUG("Expected EAP-Identity, got something else.");
 791                         return RLM_MODULE_REJECT;
 792                 }
 793
 794                 if (data_len >= sizeof(t->username->vp_strvalue)) {
 795                         RDEBUG("EAP-Identity is too long");
 796                         return RLM_MODULE_REJECT;
 797                 }
 798
 799                 /*
 800                  *      Save it for later.
 801                  */
 802                 t->username = pairmake(t, NULL, "User-Name", "", T_OP_EQ);
 803                 rad_assert(t->username != NULL);
 804
 805                 memcpy(t->username->vp_strvalue, data + 1, data_len - 1);
 806                 t->username->length = data_len - 1;
 807                 t->username->vp_strvalue[t->username->length] = 0;
 808                 RDEBUG("Got inner identity '%s'", t->username->vp_strvalue);
 809                 if (t->soh) {
 810                         t->status = PEAP_STATUS_WAIT_FOR_SOH_RESPONSE;
 811                         RDEBUG2("Requesting SoH from client");
 812                         eappeap_soh(handler, tls_session);
 813                         return RLM_MODULE_HANDLED;
 814                 }
 815                 t->status = PEAP_STATUS_PHASE2_INIT;
 816                 break;
 817
 818         case PEAP_STATUS_WAIT_FOR_SOH_RESPONSE:
 819                 fake = request_alloc_fake(request);
 820                 rad_assert(fake->packet->vps == NULL);
 821                 eapsoh_verify(request, fake->packet, data, data_len);
 822                 setup_fake_request(request, fake, t);
 823
 824                 if (t->soh_virtual_server) {
 825                         fake->server = t->soh_virtual_server;
 826                 }
 827                 RDEBUG("Sending SoH request to server %s", fake->server ? fake->server : "NULL");
 828                 debug_pair_list(fake->packet->vps);
 829                 RDEBUG("server %s {", fake->server);
 830                 rad_virtual_server(fake);
 831                 RDEBUG("} # server %s", fake->server);
 832                 RDEBUG("Got SoH reply");
 833                 debug_pair_list(fake->reply->vps);
 834
 835                 if (fake->reply->code != PW_AUTHENTICATION_ACK) {
 836                         RDEBUG2("SoH was rejected");
 837                         request_free(&fake);
 838                         t->status = PEAP_STATUS_SENT_TLV_FAILURE;
 839                         eappeap_failure(handler, tls_session);
 840                         return RLM_MODULE_HANDLED;
 841                 }
 842
 843                 /* save the SoH VPs */
 844                 t->soh_reply_vps = fake->reply->vps;
 845                 fake->reply->vps = NULL;
 846                 request_free(&fake);
 847
 848                 if (t->session_resumption_state == PEAP_RESUMPTION_YES) {
 849                         /* we're good, send success TLV */
 850                         t->status = PEAP_STATUS_SENT_TLV_SUCCESS;
 851                         eappeap_success(handler, tls_session);
 852                         return RLM_MODULE_HANDLED;
 853                 }
 854
 855                 t->status = PEAP_STATUS_PHASE2_INIT;
 856                 break;
 857
 858
 859         /*
 860          *      If we authenticated the user, then it's OK.
 861          */
 862         case PEAP_STATUS_SENT_TLV_SUCCESS:
 863                 if (eappeap_check_tlv(request, data, data_len)) {
 864                         RDEBUG2("Success");
 865                         return RLM_MODULE_OK;
 866                 }
 867
 868                 /*
 869                  *      Otherwise, the client rejected the session
 870                  *      resumption.  If the session is being re-used,
 871                  *      we need to do a full authentication.
 872                  *
 873                  *      We do this by sending an EAP-Identity request
 874                  *      inside of the PEAP tunnel.
 875                  */
 876                 if (t->session_resumption_state == PEAP_RESUMPTION_YES) {
 877                         RDEBUG2("Client rejected session resumption.  Re-starting full authentication");
 878
 879                         /*
 880                          *      Mark session resumption status.
 881                          */
 882                         t->status = PEAP_STATUS_INNER_IDENTITY_REQ_SENT;
 883                         t->session_resumption_state = PEAP_RESUMPTION_NO;
 884
 885                         eappeap_identity(handler, tls_session);
 886                         return RLM_MODULE_HANDLED;
 887                 }
 888
 889                 RDEBUG2("We sent a success, but received something weird in return.");
 890                 return RLM_MODULE_REJECT;
 891
 892         /*
 893          *      Damned if I know why the clients continue sending EAP
 894          *      packets after we told them to f*ck off.
 895          */
 896         case PEAP_STATUS_SENT_TLV_FAILURE:
 897                 RDEBUG(" The users session was previously rejected: returning reject (again.)");
 898                 RDEBUG(" *** This means you need to read the PREVIOUS messages in the debug output");
 899                 RDEBUG(" *** to find out the reason why the user was rejected.");
 900                 RDEBUG(" *** Look for \"reject\" or \"fail\".  Those earlier messages will tell you.");
 901                 RDEBUG(" *** what went wrong, and how to fix the problem.");
 902                 return RLM_MODULE_REJECT;
 903
 904                 case PEAP_STATUS_PHASE2_INIT:
 905                         RDEBUG("In state machine in phase2 init?");
 906
 907                 case PEAP_STATUS_PHASE2:
 908                         break;
 909
 910                 default:
 911                         RDEBUG2("Unhandled state in peap");
 912                         return RLM_MODULE_REJECT;
 913         }
 914
 915         fake = request_alloc_fake(request);
 916
 917         rad_assert(fake->packet->vps == NULL);
 918
 919         switch (t->status) {
 920                 /*
 921                  *      If we're in PHASE2_INIT, the phase2 method hasn't been
 922                  *      sent an Identity packet yet; do so from the stored
 923                  *      username and this will kick off the phase2 eap method
 924                  */
 925
 926         case PEAP_STATUS_PHASE2_INIT: {
 927                 size_t len = t->username->length + EAP_HEADER_LEN + 1;
 928
 929                 t->status = PEAP_STATUS_PHASE2;
 930
 931                 vp = paircreate(fake->packet, PW_EAP_MESSAGE, 0);
 932
 933                 vp->vp_octets[0] = PW_EAP_RESPONSE;
 934                 vp->vp_octets[1] = eap_ds->response->id;
 935                 vp->vp_octets[2] = (len >> 8) & 0xff;
 936                 vp->vp_octets[3] = len & 0xff;
 937                 vp->vp_octets[4] = PW_EAP_IDENTITY;
 938
 939                 if (len > sizeof(vp->vp_octets)) len = sizeof(vp->vp_octets);
 940                 memcpy(vp->vp_octets + EAP_HEADER_LEN + 1,
 941                        t->username->vp_strvalue, len - EAP_HEADER_LEN - 1);
 942                 vp->length = len;
 943
 944                 pairadd(&fake->packet->vps, vp);
 945
 946                 if (t->default_method != 0) {
 947                         RDEBUG2("Setting default EAP type for tunneled EAP session.");
 948                         vp = pairmake(fake, &fake->config_items, "EAP-Type", "0", T_OP_EQ);
 949                         vp->vp_integer = t->default_method;
 950                 }
 951                 break; }
 952
 953         case PEAP_STATUS_PHASE2:
 954                 fake->packet->vps = eap2vp(request, fake->packet,
 955                                            eap_ds, data, data_len);
 956                 if (!fake->packet->vps) {
 957                         request_free(&fake);
 958                         RDEBUG2("Unable to convert tunneled EAP packet to internal server data structures");
 959                         return PW_AUTHENTICATION_REJECT;
 960                 }
 961                 break;
 962
 963         default:
 964                 RDEBUG("Invalid state change in PEAP.");
 965                 return PW_AUTHENTICATION_REJECT;
 966         }
 967
 968         if ((debug_flag > 0) && fr_log_fp) {
 969                 RDEBUG("Got tunneled request");
 970
 971                 debug_pair_list(fake->packet->vps);
 972
 973                 fprintf(fr_log_fp, "server %s {\n",
 974                         (fake->server == NULL) ? "" : fake->server);
 975         }
 976
 977         /*
 978          *      Update other items in the REQUEST data structure.
 979          */
 980         if (!t->username) {
 981                 /*
 982                  *      There's no User-Name in the tunneled session,
 983                  *      so we add one here, by pulling it out of the
 984                  *      EAP-Identity packet.
 985                  */
 986                 if ((data[0] == PW_EAP_IDENTITY) && (data_len > 1)) {
 987                         t->username = pairmake(t, NULL, "User-Name", "", T_OP_EQ);
 988                         rad_assert(t->username != NULL);
 989
 990                         memcpy(t->username->vp_strvalue, data + 1, data_len - 1);
 991                         t->username->length = data_len - 1;
 992                         t->username->vp_strvalue[t->username->length] = 0;
 993                         DEBUG2("  PEAP: Got tunneled identity of %s", t->username->vp_strvalue);
 994
 995                         /*
 996                          *      If there's a default EAP type,
 997                          *      set it here.
 998                          */
 999                         if (t->default_method != 0) {
1000                                 DEBUG2("  PEAP: Setting default EAP type for tunneled EAP session.");
1001                                 vp = pairmake(fake, &fake->config_items, "EAP-Type", "0", T_OP_EQ);
1002                                 vp->vp_integer = t->default_method;
1003                         }
1004                 }
1005         } /* else there WAS a t->username */
1006
1007         setup_fake_request(request, fake, t);
1008
1009         if ((vp = pairfind(request->config_items, PW_VIRTUAL_SERVER, 0, TAG_ANY)) != NULL) {
1010                 fake->server = vp->vp_strvalue;
1011
1012         } else if (t->virtual_server) {
1013                 fake->server = t->virtual_server;
1014
1015         } /* else fake->server == request->server */
1016
1017         if ((debug_flag > 0) && fr_log_fp) {
1018                 fprintf(fr_log_fp, "Sending tunneled request\n");
1019
1020                 debug_pair_list(fake->packet->vps);
1021
1022                 fprintf(fr_log_fp, "server %s {\n",
1023                         (fake->server == NULL) ? "" : fake->server);
1024         }
1025
1026         /*
1027          *      Call authentication recursively, which will
1028          *      do PAP, CHAP, MS-CHAP, etc.
1029          */
1030         rad_virtual_server(fake);
1031
1032         /*
1033          *      Note that we don't do *anything* with the reply
1034          *      attributes.
1035          */
1036         if ((debug_flag > 0) && fr_log_fp) {
1037                 fprintf(fr_log_fp, "} # server %s\n",
1038                         (fake->server == NULL) ? "" : fake->server);
1039
1040                 RDEBUG("Got tunneled reply code %d", fake->reply->code);
1041
1042                 debug_pair_list(fake->reply->vps);
1043         }
1044
1045         /*
1046          *      Decide what to do with the reply.
1047          */
1048         switch (fake->reply->code) {
1049         case 0:                 /* No reply code, must be proxied... */
1050 #ifdef WITH_PROXY
1051                 vp = pairfind(fake->config_items, PW_PROXY_TO_REALM, 0, TAG_ANY);
1052
1053                 if (vp) {
1054                         eap_tunnel_data_t *tunnel;
1055
1056                         /*
1057                          *      The tunneled request was NOT handled,
1058                          *      it has to be proxied.  This means that
1059                          *      the "authenticate" stage was never
1060                          *      performed.
1061                          *
1062                          *      If we are told to NOT proxy the
1063                          *      tunneled request as EAP, then this
1064                          *      means that we've got to decode it,
1065                          *      which means that we MUST run the
1066                          *      "authenticate" portion by hand, here.
1067                          *
1068                          *      Once the tunneled EAP session is ALMOST
1069                          *      done, THEN we proxy it...
1070                          */
1071                         if (!t->proxy_tunneled_request_as_eap) {
1072                                 fake->options |= RAD_REQUEST_OPTION_PROXY_EAP;
1073
1074                                 /*
1075                                  *      Hmm... should we check for
1076                                  *      Auth-Type & EAP-Message here?
1077                                  */
1078
1079
1080                                 /*
1081                                  *      Run the EAP authentication.
1082                                  */
1083                                 DEBUG2("  PEAP: Calling authenticate in order to initiate tunneled EAP session.");
1084                                 rcode = process_authenticate(PW_AUTHTYPE_EAP, fake);
1085                                 if (rcode == RLM_MODULE_OK) {
1086                                         /*
1087                                          *      Authentication succeeded! Rah!
1088                                          */
1089                                         fake->reply->code = PW_AUTHENTICATION_ACK;
1090                                         goto do_process;
1091                                 }
1092
1093                                 if (rcode != RLM_MODULE_HANDLED) {
1094                                         DEBUG2("  PEAP: Can't handle the return code %d", rcode);
1095                                         rcode = RLM_MODULE_REJECT;
1096                                         goto done;
1097                                 }
1098
1099                                 /*
1100                                  *      The module decided it wasn't
1101                                  *      done.  Handle it like normal.
1102                                  */
1103                                 if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) == 0) {
1104                                         DEBUG2("    PEAP: Cancelling proxy to realm %s until the tunneled EAP session has been established", vp->vp_strvalue);
1105                                         goto do_process;
1106                                 }
1107
1108                                 /*
1109                                  *      The module has decoded the
1110                                  *      EAP-Message into another set
1111                                  *      of attributes.
1112                                  */
1113                                 pairdelete(&fake->packet->vps,
1114                                            PW_EAP_MESSAGE, 0, TAG_ANY);
1115                         }
1116
1117                         DEBUG2("  PEAP: Tunneled authentication will be proxied to %s", vp->vp_strvalue);
1118
1119                         /*
1120                          *      Tell the original request that it's going
1121                          *      to be proxied.
1122                          */
1123                         pairmove2(&(request->config_items),
1124                                    &(fake->config_items),
1125                                    PW_PROXY_TO_REALM, 0, TAG_ANY);
1126
1127                         /*
1128                          *      Seed the proxy packet with the
1129                          *      tunneled request.
1130                          */
1131                         rad_assert(request->proxy == NULL);
1132                         request->proxy = fake->packet;
1133                         memset(&request->proxy->src_ipaddr, 0,
1134                                sizeof(request->proxy->src_ipaddr));
1135                         memset(&request->proxy->dst_ipaddr, 0,
1136                                sizeof(request->proxy->dst_ipaddr));
1137                         request->proxy->src_port = 0;
1138                         request->proxy->dst_port = 0;
1139                         fake->packet = NULL;
1140                         rad_free(&fake->reply);
1141                         fake->reply = NULL;
1142
1143                         /*
1144                          *      Set up the callbacks for the tunnel
1145                          */
1146                         tunnel = talloc_zero(request, eap_tunnel_data_t);
1147                         tunnel->tls_session = tls_session;
1148                         tunnel->callback = eappeap_postproxy;
1149
1150                         /*
1151                          *      Associate the callback with the request.
1152                          */
1153                         rcode = request_data_add(request,
1154                                                  request->proxy,
1155                                                  REQUEST_DATA_EAP_TUNNEL_CALLBACK,
1156                                                  tunnel, NULL);
1157                         rad_assert(rcode == 0);
1158
1159                         /*
1160                          *      We're not proxying it as EAP, so we've got
1161                          *      to do the callback later.
1162                          */
1163                         if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) != 0) {
1164                                 DEBUG2("  PEAP: Remembering to do EAP-MS-CHAP-V2 post-proxy.");
1165
1166                                 /*
1167                                  *      rlm_eap.c has taken care of associating
1168                                  *      the handler with the fake request.
1169                                  *
1170                                  *      So we associate the fake request with
1171                                  *      this request.
1172                                  */
1173                                 rcode = request_data_add(request,
1174                                                          request->proxy,
1175                                                          REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK,
1176                                                          fake, my_request_free);
1177                                 rad_assert(rcode == 0);
1178
1179                                 /*
1180                                  *      Do NOT free the fake request!
1181                                  */
1182                                 return RLM_MODULE_UPDATED;
1183                         }
1184
1185                         /*
1186                          *      Didn't authenticate the packet, but
1187                          *      we're proxying it.
1188                          */
1189                         rcode = RLM_MODULE_UPDATED;
1190
1191                 } else
1192 #endif  /* WITH_PROXY */
1193                   {
1194                         DEBUG2("  PEAP: Unknown RADIUS packet type %d: rejecting tunneled user", fake->reply->code);
1195                         rcode = RLM_MODULE_REJECT;
1196                   }
1197                 break;
1198
1199         default:
1200         do_process:
1201                 rcode = process_reply(handler, tls_session, request,
1202                                       fake->reply);
1203                 break;
1204         }
1205
1206  done:
1207         request_free(&fake);
1208
1209         return rcode;
1210 }
1211
1212 static int setup_fake_request(REQUEST *request, REQUEST *fake, peap_tunnel_t *t) {
1213
1214         VALUE_PAIR *vp;
1215         /*
1216          *      Tell the request that it's a fake one.
1217          */
1218         pairmake(fake->packet, &fake->packet->vps,
1219                  "Freeradius-Proxied-To", "127.0.0.1", T_OP_EQ);
1220
1221         if (t->username) {
1222                 vp = paircopy(t, t->username);
1223                 pairadd(&fake->packet->vps, vp);
1224                 fake->username = pairfind(fake->packet->vps, PW_USER_NAME, 0, TAG_ANY);
1225                 RDEBUG2("Setting User-Name to %s", fake->username->vp_strvalue);
1226         } else {
1227                 RDEBUG2("No tunnel username (SSL resumption?)");
1228         }
1229
1230
1231         /*
1232          *      Add the State attribute, too, if it exists.
1233          */
1234         if (t->state) {
1235                 vp = paircopy(fake->packet, t->state);
1236                 if (vp) pairadd(&fake->packet->vps, vp);
1237         }
1238
1239         /*
1240          *      If this is set, we copy SOME of the request attributes
1241          *      from outside of the tunnel to inside of the tunnel.
1242          *
1243          *      We copy ONLY those attributes which do NOT already
1244          *      exist in the tunneled request.
1245          *
1246          *      This code is copied from ../rlm_eap_ttls/ttls.c
1247          */
1248         if (t->copy_request_to_tunnel) {
1249                 VALUE_PAIR *copy;
1250
1251                 for (vp = request->packet->vps; vp != NULL; vp = vp->next) {
1252                         /*
1253                          *      The attribute is a server-side thingy,
1254                          *      don't copy it.
1255                          */
1256                         if ((vp->da->attr > 255) &&
1257                             (((vp->da->attr >> 16) & 0xffff) == 0)) {
1258                                 continue;
1259                         }
1260
1261                         /*
1262                          *      The outside attribute is already in the
1263                          *      tunnel, don't copy it.
1264                          *
1265                          *      This works for BOTH attributes which
1266                          *      are originally in the tunneled request,
1267                          *      AND attributes which are copied there
1268                          *      from below.
1269                          */
1270                         if (pairfind(fake->packet->vps, vp->da->attr, vp->da->vendor, TAG_ANY)) {
1271                                 continue;
1272                         }
1273
1274                         /*
1275                          *      Some attributes are handled specially.
1276                          */
1277                         switch (vp->da->attr) {
1278                                 /*
1279                                  *      NEVER copy Message-Authenticator,
1280                                  *      EAP-Message, or State.  They're
1281                                  *      only for outside of the tunnel.
1282                                  */
1283                         case PW_USER_NAME:
1284                         case PW_USER_PASSWORD:
1285                         case PW_CHAP_PASSWORD:
1286                         case PW_CHAP_CHALLENGE:
1287                         case PW_PROXY_STATE:
1288                         case PW_MESSAGE_AUTHENTICATOR:
1289                         case PW_EAP_MESSAGE:
1290                         case PW_STATE:
1291                                 continue;
1292                                 break;
1293
1294                                 /*
1295                                  *      By default, copy it over.
1296                                  */
1297                         default:
1298                                 break;
1299                         }
1300
1301                         /*
1302                          *      Don't copy from the head, we've already
1303                          *      checked it.
1304                          */
1305                         copy = paircopy2(fake->packet, vp, vp->da->attr, vp->da->vendor, TAG_ANY);
1306                         pairadd(&fake->packet->vps, copy);
1307                 }
1308         }
1309
1310         return 0;
1311 }