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 *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 *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 *handler, tls_session_t *tls_session)
 102 {
 103         eap_packet_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 *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 VALUE_PAIR* eapsoh_verify(REQUEST *request, const uint8_t *data, unsigned int data_len) {
 160
 161         VALUE_PAIR *vp;
 162         uint8_t eap_type_base;
 163         uint32_t eap_vendor;
 164         uint32_t eap_type;
 165         int rv;
 166
 167         vp = pairmake("SoH-Supported", "no", T_OP_EQ);
 168         if (data && data[0] == PW_EAP_NAK) {
 169                 RDEBUG("SoH - client NAKed");
 170                 goto done;
 171         }
 172
 173         if (!data || data_len < 8) {
 174                 RDEBUG("SoH - eap payload too short");
 175                 goto done;
 176         }
 177
 178         eap_type_base = *data++;
 179         if (eap_type_base != 254) {
 180                 RDEBUG("SoH - response is not extended EAP: %i", eap_type_base);
 181                 goto done;
 182         }
 183
 184         eap_vendor = soh_pull_be_24(data); data += 3;
 185         if (eap_vendor != 0x137) {
 186                 RDEBUG("SoH - extended eap vendor %08x is not Microsoft", eap_vendor);
 187                 goto done;
 188         }
 189
 190         eap_type = soh_pull_be_32(data); data += 4;
 191         if (eap_type != 0x21) {
 192                 RDEBUG("SoH - response eap type %08x is not EAP-SoH", eap_type);
 193                 goto done;
 194         }
 195
 196
 197         rv = soh_verify(request, vp, data, data_len - 8);
 198         if (rv<0) {
 199                 RDEBUG("SoH - error decoding payload: %s", fr_strerror());
 200         } else {
 201                 vp->vp_integer = 1;
 202         }
 203 done:
 204         return vp;
 205 }
 206
 207 /*
 208  *      Verify the tunneled EAP message.
 209  */
 210 static int eapmessage_verify(REQUEST *request,
 211                              const uint8_t *data, unsigned int data_len)
 212 {
 213         const eap_packet_t *eap_packet = (const eap_packet_t *) data;
 214         uint8_t eap_type;
 215         char buffer[256];
 216
 217         /*
 218          *      No data, OR only 1 byte of EAP type.
 219          */
 220         if (!data || (data_len == 0) ||
 221             ((data_len <= 1) && (data[0] != PW_EAP_IDENTITY))) {
 222                 return 0;
 223         }
 224
 225         eap_type = *data;
 226         switch (eap_type) {
 227         case PW_EAP_IDENTITY:
 228                 if (data_len == 1) {
 229                         RDEBUG2("Identity - ");
 230                         return 1;
 231                 }
 232                 RDEBUG2("Identity - %*s",
 233                        data_len - 1, data + 1);
 234                 return 1;
 235                 break;
 236
 237                 /*
 238                  *      If the first byte of the packet is
 239                  *      EAP-Response, and the EAP data is a TLV,
 240                  *      then it looks OK...
 241                  */
 242         case PW_EAP_RESPONSE:
 243                 if (eap_packet->data[0] == PW_EAP_TLV) {
 244                         RDEBUG2("Received EAP-TLV response.");
 245                         return 1;
 246                 }
 247                 RDEBUG2("Got something weird.");
 248                 break;
 249
 250
 251                 /*
 252                  *      We normally do Microsoft MS-CHAPv2 (26), versus
 253                  *      Cisco MS-CHAPv2 (29).
 254                  */
 255         case PW_EAP_MSCHAPV2:
 256         default:
 257                 RDEBUG2("EAP type %s",
 258                        eaptype_type2name(eap_type,
 259                                          buffer, sizeof(buffer)));
 260                 return 1;
 261                 break;
 262         }
 263
 264         return 0;
 265 }
 266
 267 /*
 268  *      Convert a pseudo-EAP packet to a list of VALUE_PAIR's.
 269  */
 270 static VALUE_PAIR *eap2vp(REQUEST *request, EAP_DS *eap_ds,
 271                           const uint8_t *data, size_t data_len)
 272 {
 273         size_t total;
 274         VALUE_PAIR *vp = NULL, *head, **tail;
 275
 276         if (data_len > 65535) return NULL; /* paranoia */
 277
 278         vp = paircreate(PW_EAP_MESSAGE, 0, PW_TYPE_OCTETS);
 279         if (!vp) {
 280                 RDEBUG2("Failure in creating VP");
 281                 return NULL;
 282         }
 283
 284         total = data_len;
 285         if (total > 249) total = 249;
 286
 287         /*
 288          *      Hand-build an EAP packet from the crap in PEAP version 0.
 289          */
 290         vp->vp_octets[0] = PW_EAP_RESPONSE;
 291         vp->vp_octets[1] = eap_ds->response->id;
 292         vp->vp_octets[2] = (data_len + EAP_HEADER_LEN) >> 8;
 293         vp->vp_octets[3] = (data_len + EAP_HEADER_LEN) & 0xff;
 294
 295         memcpy(vp->vp_octets + EAP_HEADER_LEN, data, total);
 296         vp->length = EAP_HEADER_LEN + total;
 297
 298         head = vp;
 299         tail = &(vp->next);
 300         while (total < data_len) {
 301                 int vp_len;
 302
 303
 304                 vp = paircreate(PW_EAP_MESSAGE, 0, PW_TYPE_OCTETS);
 305                 if (!vp) {
 306                         RDEBUG2("Failure in creating VP");
 307                         pairfree(&head);
 308                         return NULL;
 309                 }
 310                 vp_len = (data_len - total);
 311                 if (vp_len > 253) vp_len = 253;
 312
 313                 memcpy(vp->vp_octets, data + total, vp_len);
 314                 vp->length = vp_len;
 315
 316                 total += vp_len;
 317                 *tail = vp;
 318                 tail = &(vp->next);
 319         }
 320
 321         return head;
 322 }
 323
 324
 325 /*
 326  *      Convert a list of VALUE_PAIR's to an EAP packet, through the
 327  *      simple expedient of dumping the EAP message
 328  */
 329 static int vp2eap(REQUEST *request, tls_session_t *tls_session, VALUE_PAIR *vp)
 330 {
 331         rad_assert(vp != NULL);
 332
 333         /*
 334          *      Skip the id, code, and length.  Just write the EAP
 335          *      type & data to the client.
 336          */
 337 #ifndef NDEBUG
 338         if ((debug_flag > 2) && fr_log_fp) {
 339                 size_t i, total;
 340                 VALUE_PAIR *this;
 341
 342                 total = 0;
 343
 344                 for (this = vp; this != NULL; this = this->next) {
 345                         int start = 0;
 346
 347                         if (this == vp) start = EAP_HEADER_LEN;
 348
 349                         for (i = start; i < vp->length; i++) {
 350                           if ((total & 0x0f) == 0) fprintf(fr_log_fp, "  PEAP tunnel data out %04x: ", (int) total);
 351
 352                                 fprintf(fr_log_fp, "%02x ", vp->vp_octets[i]);
 353
 354                                 if ((total & 0x0f) == 0x0f) fprintf(fr_log_fp, "\n");
 355                                 total++;
 356                         }
 357                 }
 358                 if ((total & 0x0f) != 0) fprintf(fr_log_fp, "\n");
 359         }
 360 #endif
 361
 362         /*
 363          *      Send the EAP data, WITHOUT the header.
 364          */
 365         (tls_session->record_plus)(&tls_session->clean_in,
 366                                    vp->vp_octets + EAP_HEADER_LEN,
 367                                    vp->length - EAP_HEADER_LEN);
 368
 369         /*
 370          *      Send the rest of the EAP data.
 371          */
 372         for (vp = vp->next; vp != NULL; vp = vp->next) {
 373                 (tls_session->record_plus)(&tls_session->clean_in,
 374                                            vp->vp_octets, vp->length);
 375         }
 376
 377         tls_handshake_send(request, tls_session);
 378
 379         return 1;
 380 }
 381
 382
 383 /*
 384  *      See if there's a TLV in the response.
 385  */
 386 static int eappeap_check_tlv(REQUEST *request, const uint8_t *data)
 387 {
 388         const eap_packet_t *eap_packet = (const eap_packet_t *) data;
 389
 390         /*
 391          *      Look for success or failure.
 392          */
 393         if ((eap_packet->code == PW_EAP_RESPONSE) &&
 394             (eap_packet->data[0] == PW_EAP_TLV)) {
 395                 if (data[10] == EAP_TLV_SUCCESS) {
 396                         return 1;
 397                 }
 398
 399                 if (data[10] == EAP_TLV_FAILURE) {
 400                         RDEBUG2("Client rejected our response.  The password is probably incorrect.");
 401                         return 0;
 402                 }
 403         }
 404
 405         return 0;
 406 }
 407
 408
 409 /*
 410  *      Use a reply packet to determine what to do.
 411  */
 412 static int process_reply(EAP_HANDLER *handler, tls_session_t *tls_session,
 413                          REQUEST *request, RADIUS_PACKET *reply)
 414 {
 415         int rcode = RLM_MODULE_REJECT;
 416         VALUE_PAIR *vp;
 417         peap_tunnel_t *t = tls_session->opaque;
 418
 419         if ((debug_flag > 0) && fr_log_fp) {
 420                 RDEBUG("Got tunneled reply RADIUS code %d",
 421                        reply->code);
 422
 423                 debug_pair_list(reply->vps);
 424         }
 425
 426         switch (reply->code) {
 427         case PW_AUTHENTICATION_ACK:
 428                 RDEBUG2("Tunneled authentication was successful.");
 429                 t->status = PEAP_STATUS_SENT_TLV_SUCCESS;
 430                 eappeap_success(handler, tls_session);
 431                 rcode = RLM_MODULE_HANDLED;
 432
 433                 /*
 434                  *      If we've been told to use the attributes from
 435                  *      the reply, then do so.
 436                  *
 437                  *      WARNING: This may leak information about the
 438                  *      tunneled user!
 439                  */
 440                 if (t->use_tunneled_reply) {
 441                         RDEBUG2("Saving tunneled attributes for later");
 442
 443                         /*
 444                          *      Clean up the tunneled reply.
 445                          */
 446                         pairdelete(&reply->vps, PW_PROXY_STATE, 0);
 447                         pairdelete(&reply->vps, PW_EAP_MESSAGE, 0);
 448                         pairdelete(&reply->vps, PW_MESSAGE_AUTHENTICATOR, 0);
 449
 450                         /*
 451                          *      Delete MPPE keys & encryption policy.  We don't
 452                          *      want these here.
 453                          */
 454                         pairdelete(&reply->vps, 7, VENDORPEC_MICROSOFT);
 455                         pairdelete(&reply->vps, 8, VENDORPEC_MICROSOFT);
 456                         pairdelete(&reply->vps, 16, VENDORPEC_MICROSOFT);
 457                         pairdelete(&reply->vps, 17, VENDORPEC_MICROSOFT);
 458
 459                         t->accept_vps = reply->vps;
 460                         reply->vps = NULL;
 461                 }
 462                 break;
 463
 464         case PW_AUTHENTICATION_REJECT:
 465                 RDEBUG2("Tunneled authentication was rejected.");
 466                 t->status = PEAP_STATUS_SENT_TLV_FAILURE;
 467                 eappeap_failure(handler, tls_session);
 468                 rcode = RLM_MODULE_HANDLED;
 469                 break;
 470
 471         case PW_ACCESS_CHALLENGE:
 472                 RDEBUG2("Got tunneled Access-Challenge");
 473
 474                 /*
 475                  *      Keep the State attribute, if necessary.
 476                  *
 477                  *      Get rid of the old State, too.
 478                  */
 479                 pairfree(&t->state);
 480                 pairmove2(&t->state, &(reply->vps), PW_STATE, 0);
 481
 482                 /*
 483                  *      PEAP takes only EAP-Message attributes inside
 484                  *      of the tunnel.  Any Reply-Message in the
 485                  *      Access-Challenge is ignored.
 486                  */
 487                 vp = NULL;
 488                 pairmove2(&vp, &(reply->vps), PW_EAP_MESSAGE, 0);
 489
 490                 /*
 491                  *      Handle EAP-MSCHAP-V2, where Access-Accept's
 492                  *      from the home server may contain MS-CHAP-Success,
 493                  *      which the module turns into challenges, so that
 494                  *      the client may respond to the challenge with
 495                  *      an "ack" packet.
 496                  */
 497                 if (t->home_access_accept && t->use_tunneled_reply) {
 498                         RDEBUG2("Saving tunneled attributes for later");
 499
 500                         /*
 501                          *      Clean up the tunneled reply.
 502                          */
 503                         pairdelete(&reply->vps, PW_PROXY_STATE, 0);
 504                         pairdelete(&reply->vps, PW_MESSAGE_AUTHENTICATOR, 0);
 505
 506                         t->accept_vps = reply->vps;
 507                         reply->vps = NULL;
 508                 }
 509
 510                 /*
 511                  *      Handle the ACK, by tunneling any necessary reply
 512                  *      VP's back to the client.
 513                  */
 514                 if (vp) {
 515                         vp2eap(request, tls_session, vp);
 516                         pairfree(&vp);
 517                 }
 518
 519                 rcode = RLM_MODULE_HANDLED;
 520                 break;
 521
 522         default:
 523                 RDEBUG2("Unknown RADIUS packet type %d: rejecting tunneled user", reply->code);
 524                 rcode = RLM_MODULE_REJECT;
 525                 break;
 526         }
 527
 528         return rcode;
 529 }
 530
 531 #ifdef WITH_PROXY
 532 /*
 533  *      Do post-proxy processing,
 534  */
 535 static int eappeap_postproxy(EAP_HANDLER *handler, void *data)
 536 {
 537         int rcode;
 538         tls_session_t *tls_session = (tls_session_t *) data;
 539         REQUEST *fake, *request = handler->request;
 540
 541         rad_assert(request != NULL);
 542         RDEBUG2("Passing reply from proxy back into the tunnel.");
 543
 544         /*
 545          *      If there was a fake request associated with the proxied
 546          *      request, do more processing of it.
 547          */
 548         fake = (REQUEST *) request_data_get(handler->request,
 549                                             handler->request->proxy,
 550                                             REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK);
 551
 552         /*
 553          *      Do the callback, if it exists, and if it was a success.
 554          */
 555         if (fake && (handler->request->proxy_reply->code == PW_AUTHENTICATION_ACK)) {
 556                 peap_tunnel_t *t = tls_session->opaque;
 557
 558                 t->home_access_accept = TRUE;
 559
 560                 /*
 561                  *      Terrible hacks.
 562                  */
 563                 rad_assert(fake->packet == NULL);
 564                 fake->packet = request->proxy;
 565                 fake->packet->src_ipaddr = request->packet->src_ipaddr;
 566                 request->proxy = NULL;
 567
 568                 rad_assert(fake->reply == NULL);
 569                 fake->reply = request->proxy_reply;
 570                 request->proxy_reply = NULL;
 571
 572                 if ((debug_flag > 0) && fr_log_fp) {
 573                         fprintf(fr_log_fp, "server %s {\n", fake->server);
 574                 }
 575
 576                 /*
 577                  *      Perform a post-auth stage, which will get the EAP
 578                  *      handler, too...
 579                  */
 580                 fake->options &= ~RAD_REQUEST_OPTION_PROXY_EAP;
 581                 RDEBUG2("Passing reply back for EAP-MS-CHAP-V2");
 582                 module_post_proxy(0, fake);
 583
 584                 /*
 585                  *      FIXME: If rcode returns fail, do something
 586                  *      intelligent...
 587                  */
 588                 rcode = rad_postauth(fake);
 589
 590                 if ((debug_flag > 0) && fr_log_fp) {
 591                         fprintf(fr_log_fp, "} # server %s\n", fake->server);
 592
 593                         RDEBUG("Final reply from tunneled session code %d",
 594                                fake->reply->code);
 595
 596                         debug_pair_list(fake->reply->vps);
 597                 }
 598
 599                 /*
 600                  *      Terrible hacks.
 601                  */
 602                 request->proxy = fake->packet;
 603                 fake->packet = NULL;
 604                 request->proxy_reply = fake->reply;
 605                 fake->reply = NULL;
 606
 607                 /*
 608                  *      And we're done with this request.
 609                  */
 610
 611                 switch (rcode) {
 612                 case RLM_MODULE_FAIL:
 613                         request_free(&fake);
 614                         eaptls_fail(handler, 0);
 615                         return 0;
 616                         break;
 617
 618                 default:  /* Don't Do Anything */
 619                         RDEBUG2("Got reply %d", request->proxy_reply->code);
 620                         break;
 621                 }
 622         }
 623         request_free(&fake);    /* robust if fake == NULL */
 624
 625         /*
 626          *      If there was no EAP-Message in the reply packet, then
 627          *      we know that we're supposed to re-run the "authenticate"
 628          *      stage, in order to get the right kind of handling...
 629          */
 630
 631         /*
 632          *      Process the reply from the home server.
 633          */
 634
 635         rcode = process_reply(handler, tls_session, handler->request,
 636                               handler->request->proxy_reply);
 637
 638         /*
 639          *      The proxy code uses the reply from the home server as
 640          *      the basis for the reply to the NAS.  We don't want that,
 641          *      so we toss it, after we've had our way with it.
 642          */
 643         pairfree(&handler->request->proxy_reply->vps);
 644
 645         switch (rcode) {
 646         case RLM_MODULE_REJECT:
 647                 RDEBUG2("Reply was rejected");
 648                 eaptls_fail(handler, 0);
 649                 return 0;
 650
 651         case RLM_MODULE_HANDLED:
 652                 RDEBUG2("Reply was handled");
 653                 eaptls_request(handler->eap_ds, tls_session);
 654                 return 1;
 655
 656         case RLM_MODULE_OK:
 657                 RDEBUG2("Reply was OK");
 658
 659                 /*
 660                  *      Success: Automatically return MPPE keys.
 661                  */
 662                 return eaptls_success(handler, 0);
 663
 664         default:
 665                 RDEBUG2("Reply was unknown.");
 666                 break;
 667         }
 668
 669         eaptls_fail(handler, 0);
 670         return 0;
 671 }
 672
 673 /*
 674  *      Free a request.
 675  */
 676 static void my_request_free(void *data)
 677 {
 678         REQUEST *request = (REQUEST *)data;
 679
 680         request_free(&request);
 681 }
 682 #endif
 683
 684
 685 static const char *peap_state(peap_tunnel_t *t)
 686 {
 687         switch (t->status) {
 688                 case PEAP_STATUS_TUNNEL_ESTABLISHED:
 689                         return "TUNNEL ESTABLISHED";
 690                 case PEAP_STATUS_WAIT_FOR_SOH_RESPONSE:
 691                         return "WAITING FOR SOH RESPONSE";
 692                 case PEAP_STATUS_INNER_IDENTITY_REQ_SENT:
 693                         return "WAITING FOR INNER IDENTITY";
 694                 case PEAP_STATUS_SENT_TLV_SUCCESS:
 695                         return "send tlv success";
 696                 case PEAP_STATUS_SENT_TLV_FAILURE:
 697                         return "send tlv failure";
 698                 case PEAP_STATUS_PHASE2_INIT:
 699                         return "phase2_init";
 700                 case PEAP_STATUS_PHASE2:
 701                         return "phase2";
 702                 default:
 703                         break;
 704         }
 705         return "?";
 706 }
 707
 708 static void print_tunneled_data(const uint8_t *data, size_t data_len)
 709 {
 710         size_t i;
 711
 712         if ((debug_flag > 2) && fr_log_fp) {
 713                 for (i = 0; i < data_len; i++) {
 714                   if ((i & 0x0f) == 0) fprintf(fr_log_fp, "  PEAP tunnel data in %02x: ", (int) i);
 715
 716                         fprintf(fr_log_fp, "%02x ", data[i]);
 717
 718                         if ((i & 0x0f) == 0x0f) fprintf(fr_log_fp, "\n");
 719                 }
 720                 if ((data_len & 0x0f) != 0) fprintf(fr_log_fp, "\n");
 721         }
 722 }
 723
 724
 725 /*
 726  *      Process the pseudo-EAP contents of the tunneled data.
 727  */
 728 int eappeap_process(EAP_HANDLER *handler, tls_session_t *tls_session)
 729 {
 730         peap_tunnel_t *t = tls_session->opaque;
 731         REQUEST *fake;
 732         VALUE_PAIR *vp;
 733         int rcode = RLM_MODULE_REJECT;
 734         const uint8_t   *data;
 735         unsigned int data_len;
 736
 737         REQUEST *request = handler->request;
 738         EAP_DS *eap_ds = handler->eap_ds;
 739
 740         rad_assert(request != NULL);
 741
 742         /*
 743          *      Just look at the buffer directly, without doing
 744          *      record_minus.  This lets us avoid another data copy.
 745          */
 746         data_len = tls_session->clean_out.used;
 747         tls_session->clean_out.used = 0;
 748         data = tls_session->clean_out.data;
 749
 750         RDEBUG2("Peap state %s", peap_state(t));
 751
 752         if ((t->status != PEAP_STATUS_TUNNEL_ESTABLISHED) &&
 753             !eapmessage_verify(request, data, data_len)) {
 754                 RDEBUG2("FAILED processing PEAP: Tunneled data is invalid.");
 755                 if (debug_flag > 2) print_tunneled_data(data, data_len);
 756                 return RLM_MODULE_REJECT;
 757         }
 758
 759         switch (t->status) {
 760         case PEAP_STATUS_TUNNEL_ESTABLISHED:
 761                 /* FIXME: should be no data in the buffer here, check & assert? */
 762
 763                 if (SSL_session_reused(tls_session->ssl)) {
 764                         RDEBUG2("Skipping Phase2 because of session resumption");
 765                         t->session_resumption_state = PEAP_RESUMPTION_YES;
 766                         if (t->soh) {
 767                                 t->status = PEAP_STATUS_WAIT_FOR_SOH_RESPONSE;
 768                                 RDEBUG2("Requesting SoH from client");
 769                                 eappeap_soh(handler, tls_session);
 770                                 return RLM_MODULE_HANDLED;
 771                         }
 772                         /* we're good, send success TLV */
 773                         t->status = PEAP_STATUS_SENT_TLV_SUCCESS;
 774                         eappeap_success(handler, tls_session);
 775
 776                 } else {
 777                         /* send an identity request */
 778                         t->session_resumption_state = PEAP_RESUMPTION_NO;
 779                         t->status = PEAP_STATUS_INNER_IDENTITY_REQ_SENT;
 780                         eappeap_identity(handler, tls_session);
 781                 }
 782                 return RLM_MODULE_HANDLED;
 783
 784         case PEAP_STATUS_INNER_IDENTITY_REQ_SENT:
 785                 /* we're expecting an identity response */
 786                 if (data[0] != PW_EAP_IDENTITY) {
 787                         RDEBUG("Expected EAP-Identity, got something else.");
 788                         return RLM_MODULE_REJECT;
 789                 }
 790
 791                 if (data_len >= sizeof(t->username->vp_strvalue)) {
 792                         RDEBUG("EAP-Identity is too long");
 793                         return RLM_MODULE_REJECT;
 794                 }
 795
 796                 /*
 797                  *      Save it for later.
 798                  */
 799                 t->username = pairmake("User-Name", "", T_OP_EQ);
 800                 rad_assert(t->username != NULL);
 801
 802                 memcpy(t->username->vp_strvalue, data + 1, data_len - 1);
 803                 t->username->length = data_len - 1;
 804                 t->username->vp_strvalue[t->username->length] = 0;
 805                 RDEBUG("Got inner identity '%s'", t->username->vp_strvalue);
 806                 if (t->soh) {
 807                         t->status = PEAP_STATUS_WAIT_FOR_SOH_RESPONSE;
 808                         RDEBUG2("Requesting SoH from client");
 809                         eappeap_soh(handler, tls_session);
 810                         return RLM_MODULE_HANDLED;
 811                 }
 812                 t->status = PEAP_STATUS_PHASE2_INIT;
 813                 break;
 814
 815         case PEAP_STATUS_WAIT_FOR_SOH_RESPONSE:
 816                 fake = request_alloc_fake(request);
 817                 rad_assert(fake->packet->vps == NULL);
 818                 fake->packet->vps = eapsoh_verify(request, data, data_len);
 819                 setup_fake_request(request, fake, t);
 820
 821                 if (t->soh_virtual_server) {
 822                         fake->server = t->soh_virtual_server;
 823                 }
 824                 RDEBUG("Sending SoH request to server %s", fake->server ? fake->server : "NULL");
 825                 debug_pair_list(fake->packet->vps);
 826                 RDEBUG("server %s {", fake->server);
 827                 rad_authenticate(fake);
 828                 RDEBUG("} # server %s", fake->server);
 829                 RDEBUG("Got SoH reply");
 830                 debug_pair_list(fake->reply->vps);
 831
 832                 if (fake->reply->code != PW_AUTHENTICATION_ACK) {
 833                         RDEBUG2("SoH was rejected");
 834                         request_free(&fake);
 835                         t->status = PEAP_STATUS_SENT_TLV_FAILURE;
 836                         eappeap_failure(handler, tls_session);
 837                         return RLM_MODULE_HANDLED;
 838                 }
 839
 840                 /* save the SoH VPs */
 841                 t->soh_reply_vps = fake->reply->vps;
 842                 fake->reply->vps = NULL;
 843                 request_free(&fake);
 844
 845                 if (t->session_resumption_state == PEAP_RESUMPTION_YES) {
 846                         /* we're good, send success TLV */
 847                         t->status = PEAP_STATUS_SENT_TLV_SUCCESS;
 848                         eappeap_success(handler, tls_session);
 849                         return RLM_MODULE_HANDLED;
 850                 }
 851
 852                 t->status = PEAP_STATUS_PHASE2_INIT;
 853                 break;
 854
 855
 856         /*
 857          *      If we authenticated the user, then it's OK.
 858          */
 859         case PEAP_STATUS_SENT_TLV_SUCCESS:
 860                 if (eappeap_check_tlv(request, data)) {
 861                         RDEBUG2("Success");
 862                         return RLM_MODULE_OK;
 863                 }
 864
 865                 /*
 866                  *      Otherwise, the client rejected the session
 867                  *      resumption.  If the session is being re-used,
 868                  *      we need to do a full authentication.
 869                  *
 870                  *      We do this by sending an EAP-Identity request
 871                  *      inside of the PEAP tunnel.
 872                  */
 873                 if (t->session_resumption_state == PEAP_RESUMPTION_YES) {
 874                         RDEBUG2("Client rejected session resumption.  Re-starting full authentication");
 875
 876                         /*
 877                          *      Mark session resumption status.
 878                          */
 879                         t->status = PEAP_STATUS_INNER_IDENTITY_REQ_SENT;
 880                         t->session_resumption_state = PEAP_RESUMPTION_NO;
 881
 882                         eappeap_identity(handler, tls_session);
 883                         return RLM_MODULE_HANDLED;
 884                 }
 885
 886                 RDEBUG2("We sent a success, but received something weird in return.");
 887                 return RLM_MODULE_REJECT;
 888
 889         /*
 890          *      Damned if I know why the clients continue sending EAP
 891          *      packets after we told them to f*ck off.
 892          */
 893         case PEAP_STATUS_SENT_TLV_FAILURE:
 894                 RDEBUG(" The users session was previously rejected: returning reject (again.)");
 895                 RDEBUG(" *** This means you need to read the PREVIOUS messages in the debug output");
 896                 RDEBUG(" *** to find out the reason why the user was rejected.");
 897                 RDEBUG(" *** Look for \"reject\" or \"fail\".  Those earlier messages will tell you.");
 898                 RDEBUG(" *** what went wrong, and how to fix the problem.");
 899                 return RLM_MODULE_REJECT;
 900
 901                 case PEAP_STATUS_PHASE2_INIT:
 902                         RDEBUG("In state machine in phase2 init?");
 903
 904                 case PEAP_STATUS_PHASE2:
 905                         break;
 906
 907                 default:
 908                         RDEBUG2("Unhandled state in peap");
 909                         return RLM_MODULE_REJECT;
 910         }
 911
 912         fake = request_alloc_fake(request);
 913
 914         rad_assert(fake->packet->vps == NULL);
 915
 916         switch (t->status) {
 917                 /*
 918                  *      If we're in PHASE2_INIT, the phase2 method hasn't been
 919                  *      sent an Identity packet yet; do so from the stored
 920                  *      username and this will kick off the phase2 eap method
 921                  */
 922
 923         case PEAP_STATUS_PHASE2_INIT: {
 924                 int len = t->username->length + EAP_HEADER_LEN + 1;
 925
 926                 t->status = PEAP_STATUS_PHASE2;
 927
 928                 vp = paircreate(PW_EAP_MESSAGE, 0, PW_TYPE_OCTETS);
 929
 930                 vp->vp_octets[0] = PW_EAP_RESPONSE;
 931                 vp->vp_octets[1] = eap_ds->response->id;
 932                 vp->vp_octets[2] = (len >> 8) & 0xff;
 933                 vp->vp_octets[3] = len & 0xff;
 934                 vp->vp_octets[4] = PW_EAP_IDENTITY;
 935
 936                 memcpy(vp->vp_octets + EAP_HEADER_LEN + 1, t->username->vp_strvalue, t->username->length);
 937                 vp->length = len;
 938
 939                 pairadd(&fake->packet->vps, vp);
 940
 941                 if (t->default_eap_type != 0) {
 942                         RDEBUG2("Setting default EAP type for tunneled EAP session.");
 943                         vp = pairmake("EAP-Type", "0", T_OP_EQ);
 944                         vp->vp_integer = t->default_eap_type;
 945                         pairadd(&fake->config_items, vp);
 946                 }
 947                 break; }
 948
 949         case PEAP_STATUS_PHASE2:
 950                 fake->packet->vps = eap2vp(request, eap_ds, data, data_len);
 951                 if (!fake->packet->vps) {
 952                         request_free(&fake);
 953                         RDEBUG2("Unable to convert tunneled EAP packet to internal server data structures");
 954                         return PW_AUTHENTICATION_REJECT;
 955                 }
 956                 break;
 957
 958         default:
 959                 RDEBUG("Invalid state change in PEAP.");
 960                 return PW_AUTHENTICATION_REJECT;
 961         }
 962
 963         if ((debug_flag > 0) && fr_log_fp) {
 964                 RDEBUG("Got tunneled request");
 965
 966                 debug_pair_list(fake->packet->vps);
 967
 968                 fprintf(fr_log_fp, "server %s {\n",
 969                         (fake->server == NULL) ? "" : fake->server);
 970         }
 971
 972         /*
 973          *      Update other items in the REQUEST data structure.
 974          */
 975         if (!t->username) {
 976                 /*
 977                  *      There's no User-Name in the tunneled session,
 978                  *      so we add one here, by pulling it out of the
 979                  *      EAP-Identity packet.
 980                  */
 981                 if ((data[0] == PW_EAP_IDENTITY) && (data_len > 1)) {
 982                         t->username = pairmake("User-Name", "", T_OP_EQ);
 983                         rad_assert(t->username != NULL);
 984
 985                         memcpy(t->username->vp_strvalue, data + 1, data_len - 1);
 986                         t->username->length = data_len - 1;
 987                         t->username->vp_strvalue[t->username->length] = 0;
 988                         DEBUG2("  PEAP: Got tunneled identity of %s", t->username->vp_strvalue);
 989
 990                         /*
 991                          *      If there's a default EAP type,
 992                          *      set it here.
 993                          */
 994                         if (t->default_eap_type != 0) {
 995                                 DEBUG2("  PEAP: Setting default EAP type for tunneled EAP session.");
 996                                 vp = pairmake("EAP-Type", "0", T_OP_EQ);
 997                                 vp->vp_integer = t->default_eap_type;
 998                                 pairadd(&fake->config_items, vp);
 999                         }
1000                 }
1001         } /* else there WAS a t->username */
1002
1003         setup_fake_request(request, fake, t);
1004
1005         if ((vp = pairfind(request->config_items, PW_VIRTUAL_SERVER, 0)) != NULL) {
1006                 fake->server = vp->vp_strvalue;
1007
1008         } else if (t->virtual_server) {
1009                 fake->server = t->virtual_server;
1010
1011         } /* else fake->server == request->server */
1012
1013         if ((debug_flag > 0) && fr_log_fp) {
1014                 fprintf(fr_log_fp, "Sending tunneled request\n");
1015
1016                 debug_pair_list(fake->packet->vps);
1017
1018                 fprintf(fr_log_fp, "server %s {\n",
1019                         (fake->server == NULL) ? "" : fake->server);
1020         }
1021
1022         /*
1023          *      Call authentication recursively, which will
1024          *      do PAP, CHAP, MS-CHAP, etc.
1025          */
1026         rad_authenticate(fake);
1027
1028         /*
1029          *      Note that we don't do *anything* with the reply
1030          *      attributes.
1031          */
1032         if ((debug_flag > 0) && fr_log_fp) {
1033                 fprintf(fr_log_fp, "} # server %s\n",
1034                         (fake->server == NULL) ? "" : fake->server);
1035
1036                 RDEBUG("Got tunneled reply code %d", fake->reply->code);
1037
1038                 debug_pair_list(fake->reply->vps);
1039         }
1040
1041         /*
1042          *      Decide what to do with the reply.
1043          */
1044         switch (fake->reply->code) {
1045         case 0:                 /* No reply code, must be proxied... */
1046 #ifdef WITH_PROXY
1047                 vp = pairfind(fake->config_items, PW_PROXY_TO_REALM, 0);
1048
1049                 if (vp) {
1050                         eap_tunnel_data_t *tunnel;
1051
1052                         /*
1053                          *      The tunneled request was NOT handled,
1054                          *      it has to be proxied.  This means that
1055                          *      the "authenticate" stage was never
1056                          *      performed.
1057                          *
1058                          *      If we are told to NOT proxy the
1059                          *      tunneled request as EAP, then this
1060                          *      means that we've got to decode it,
1061                          *      which means that we MUST run the
1062                          *      "authenticate" portion by hand, here.
1063                          *
1064                          *      Once the tunneled EAP session is ALMOST
1065                          *      done, THEN we proxy it...
1066                          */
1067                         if (!t->proxy_tunneled_request_as_eap) {
1068                                 fake->options |= RAD_REQUEST_OPTION_PROXY_EAP;
1069
1070                                 /*
1071                                  *      Hmm... should we check for
1072                                  *      Auth-Type & EAP-Message here?
1073                                  */
1074
1075
1076                                 /*
1077                                  *      Run the EAP authentication.
1078                                  */
1079                                 DEBUG2("  PEAP: Calling authenticate in order to initiate tunneled EAP session.");
1080                                 rcode = module_authenticate(PW_AUTHTYPE_EAP, fake);
1081                                 if (rcode == RLM_MODULE_OK) {
1082                                         /*
1083                                          *      Authentication succeeded! Rah!
1084                                          */
1085                                         fake->reply->code = PW_AUTHENTICATION_ACK;
1086                                         goto do_process;
1087                                 }
1088
1089                                 if (rcode != RLM_MODULE_HANDLED) {
1090                                         DEBUG2("  PEAP: Can't handle the return code %d", rcode);
1091                                         rcode = RLM_MODULE_REJECT;
1092                                         goto done;
1093                                 }
1094
1095                                 /*
1096                                  *      The module decided it wasn't
1097                                  *      done.  Handle it like normal.
1098                                  */
1099                                 if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) == 0) {
1100                                         DEBUG2("    PEAP: Cancelling proxy to realm %s until the tunneled EAP session has been established", vp->vp_strvalue);
1101                                         goto do_process;
1102                                 }
1103
1104                                 /*
1105                                  *      The module has decoded the
1106                                  *      EAP-Message into another set
1107                                  *      of attributes.
1108                                  */
1109                                 pairdelete(&fake->packet->vps,
1110                                            PW_EAP_MESSAGE, 0);
1111                         }
1112
1113                         DEBUG2("  PEAP: Tunneled authentication will be proxied to %s", vp->vp_strvalue);
1114
1115                         /*
1116                          *      Tell the original request that it's going
1117                          *      to be proxied.
1118                          */
1119                         pairmove2(&(request->config_items),
1120                                   &(fake->config_items),
1121                                   PW_PROXY_TO_REALM, 0);
1122
1123                         /*
1124                          *      Seed the proxy packet with the
1125                          *      tunneled request.
1126                          */
1127                         rad_assert(request->proxy == NULL);
1128                         request->proxy = fake->packet;
1129                         memset(&request->proxy->src_ipaddr, 0,
1130                                sizeof(request->proxy->src_ipaddr));
1131                         memset(&request->proxy->src_ipaddr, 0,
1132                                sizeof(request->proxy->src_ipaddr));
1133                         request->proxy->src_port = 0;
1134                         request->proxy->dst_port = 0;
1135                         fake->packet = NULL;
1136                         rad_free(&fake->reply);
1137                         fake->reply = NULL;
1138
1139                         /*
1140                          *      Set up the callbacks for the tunnel
1141                          */
1142                         tunnel = rad_malloc(sizeof(*tunnel));
1143                         memset(tunnel, 0, sizeof(*tunnel));
1144
1145                         tunnel->tls_session = tls_session;
1146                         tunnel->callback = eappeap_postproxy;
1147
1148                         /*
1149                          *      Associate the callback with the request.
1150                          */
1151                         rcode = request_data_add(request,
1152                                                  request->proxy,
1153                                                  REQUEST_DATA_EAP_TUNNEL_CALLBACK,
1154                                                  tunnel, free);
1155                         rad_assert(rcode == 0);
1156
1157                         /*
1158                          *      We're not proxying it as EAP, so we've got
1159                          *      to do the callback later.
1160                          */
1161                         if ((fake->options & RAD_REQUEST_OPTION_PROXY_EAP) != 0) {
1162                                 DEBUG2("  PEAP: Remembering to do EAP-MS-CHAP-V2 post-proxy.");
1163
1164                                 /*
1165                                  *      rlm_eap.c has taken care of associating
1166                                  *      the handler with the fake request.
1167                                  *
1168                                  *      So we associate the fake request with
1169                                  *      this request.
1170                                  */
1171                                 rcode = request_data_add(request,
1172                                                          request->proxy,
1173                                                          REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK,
1174                                                          fake, my_request_free);
1175                                 rad_assert(rcode == 0);
1176
1177                                 /*
1178                                  *      Do NOT free the fake request!
1179                                  */
1180                                 return RLM_MODULE_UPDATED;
1181                         }
1182
1183                         /*
1184                          *      Didn't authenticate the packet, but
1185                          *      we're proxying it.
1186                          */
1187                         rcode = RLM_MODULE_UPDATED;
1188
1189                 } else
1190 #endif  /* WITH_PROXY */
1191                   {
1192                         DEBUG2("  PEAP: Unknown RADIUS packet type %d: rejecting tunneled user", fake->reply->code);
1193                         rcode = RLM_MODULE_REJECT;
1194                   }
1195                 break;
1196
1197         default:
1198         do_process:
1199                 rcode = process_reply(handler, tls_session, request,
1200                                       fake->reply);
1201                 break;
1202         }
1203
1204  done:
1205         request_free(&fake);
1206
1207         return rcode;
1208 }
1209
1210 static int setup_fake_request(REQUEST *request, REQUEST *fake, peap_tunnel_t *t) {
1211
1212         VALUE_PAIR *vp;
1213         /*
1214          *      Tell the request that it's a fake one.
1215          */
1216         vp = pairmake("Freeradius-Proxied-To", "127.0.0.1", T_OP_EQ);
1217         if (vp) {
1218                 pairadd(&fake->packet->vps, vp);
1219         }
1220
1221         if (t->username) {
1222                 vp = paircopy(t->username);
1223                 pairadd(&fake->packet->vps, vp);
1224                 fake->username = pairfind(fake->packet->vps, PW_USER_NAME, 0);
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(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->attribute > 255) &&
1257                             (((vp->attribute >> 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->attribute, vp->vendor)) {
1271                                 continue;
1272                         }
1273
1274                         /*
1275                          *      Some attributes are handled specially.
1276                          */
1277                         switch (vp->attribute) {
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(vp, vp->attribute, vp->vendor);
1306                         pairadd(&fake->packet->vps, copy);
1307                 }
1308         }
1309
1310         return 0;
1311 }