contrib/wpa_supplicant/eap_ttls.c

   1 /*
   2  * WPA Supplicant / EAP-TTLS (draft-ietf-pppext-eap-ttls-03.txt)
   3  * Copyright (c) 2004-2005, Jouni Malinen <jkmaline@cc.hut.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17 #include <string.h>
  18
  19 #include "common.h"
  20 #include "eap_i.h"
  21 #include "eap_tls_common.h"
  22 #include "wpa_supplicant.h"
  23 #include "config_ssid.h"
  24 #include "ms_funcs.h"
  25 #include "md5.h"
  26 #include "tls.h"
  27 #include "eap_ttls.h"
  28
  29
  30 static void eap_ttls_deinit(struct eap_sm *sm, void *priv);
  31
  32
  33 struct eap_ttls_data {
  34         struct eap_ssl_data ssl;
  35
  36         const struct eap_method *phase2_method;
  37         void *phase2_priv;
  38         int phase2_success;
  39         int phase2_start;
  40
  41         enum {
  42                 EAP_TTLS_PHASE2_EAP,
  43                 EAP_TTLS_PHASE2_MSCHAPV2,
  44                 EAP_TTLS_PHASE2_MSCHAP,
  45                 EAP_TTLS_PHASE2_PAP,
  46                 EAP_TTLS_PHASE2_CHAP
  47         } phase2_type;
  48         u8 phase2_eap_type;
  49         u8 *phase2_eap_types;
  50         size_t num_phase2_eap_types;
  51
  52         u8 auth_response[20];
  53         int auth_response_valid;
  54         u8 ident;
  55         int resuming; /* starting a resumed session */
  56         int reauth; /* reauthentication */
  57         u8 *key_data;
  58
  59         u8 *pending_phase2_req;
  60         size_t pending_phase2_req_len;
  61 };
  62
  63
  64 static void * eap_ttls_init(struct eap_sm *sm)
  65 {
  66         struct eap_ttls_data *data;
  67         struct wpa_ssid *config = eap_get_config(sm);
  68         char *selected;
  69
  70         data = malloc(sizeof(*data));
  71         if (data == NULL)
  72                 return NULL;
  73         memset(data, 0, sizeof(*data));
  74         selected = "EAP";
  75         data->phase2_type = EAP_TTLS_PHASE2_EAP;
  76         if (config && config->phase2) {
  77                 if (strstr(config->phase2, "autheap=")) {
  78                         selected = "EAP";
  79                         data->phase2_type = EAP_TTLS_PHASE2_EAP;
  80                 } else if (strstr(config->phase2, "auth=MSCHAPV2")) {
  81                         selected = "MSCHAPV2";
  82                         data->phase2_type = EAP_TTLS_PHASE2_MSCHAPV2;
  83                 } else if (strstr(config->phase2, "auth=MSCHAP")) {
  84                         selected = "MSCHAP";
  85                         data->phase2_type = EAP_TTLS_PHASE2_MSCHAP;
  86                 } else if (strstr(config->phase2, "auth=PAP")) {
  87                         selected = "PAP";
  88                         data->phase2_type = EAP_TTLS_PHASE2_PAP;
  89                 } else if (strstr(config->phase2, "auth=CHAP")) {
  90                         selected = "CHAP";
  91                         data->phase2_type = EAP_TTLS_PHASE2_CHAP;
  92                 }
  93         }
  94         wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase2 type: %s", selected);
  95
  96         if (data->phase2_type == EAP_TTLS_PHASE2_EAP) {
  97                 if (config && config->phase2) {
  98                         char *start, *pos, *buf;
  99                         u8 method, *methods = NULL, *_methods;
 100                         size_t num_methods = 0;
 101                         start = buf = strdup(config->phase2);
 102                         if (buf == NULL) {
 103                                 eap_ttls_deinit(sm, data);
 104                                 return NULL;
 105                         }
 106                         while (start && *start != '\0') {
 107                                 pos = strstr(start, "autheap=");
 108                                 if (pos == NULL)
 109                                         break;
 110                                 if (start != pos && *(pos - 1) != ' ') {
 111                                         start = pos + 8;
 112                                         continue;
 113                                 }
 114
 115                                 start = pos + 8;
 116                                 pos = strchr(start, ' ');
 117                                 if (pos)
 118                                         *pos++ = '\0';
 119                                 method = eap_get_phase2_type(start);
 120                                 if (method == EAP_TYPE_NONE) {
 121                                         wpa_printf(MSG_ERROR, "EAP-TTLS: "
 122                                                    "Unsupported Phase2 EAP "
 123                                                    "method '%s'", start);
 124                                 } else {
 125                                         num_methods++;
 126                                         _methods = realloc(methods,
 127                                                            num_methods);
 128                                         if (_methods == NULL) {
 129                                                 free(methods);
 130                                                 eap_ttls_deinit(sm, data);
 131                                                 return NULL;
 132                                         }
 133                                         methods = _methods;
 134                                         methods[num_methods - 1] = method;
 135                                 }
 136
 137                                 start = pos;
 138                         }
 139                         free(buf);
 140                         data->phase2_eap_types = methods;
 141                         data->num_phase2_eap_types = num_methods;
 142                 }
 143                 if (data->phase2_eap_types == NULL) {
 144                         data->phase2_eap_types = eap_get_phase2_types(
 145                                 config, &data->num_phase2_eap_types);
 146                 }
 147                 if (data->phase2_eap_types == NULL) {
 148                         wpa_printf(MSG_ERROR, "EAP-TTLS: No Phase2 EAP method "
 149                                    "available");
 150                         eap_ttls_deinit(sm, data);
 151                         return NULL;
 152                 }
 153                 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Phase2 EAP types",
 154                             data->phase2_eap_types,
 155                             data->num_phase2_eap_types);
 156                 data->phase2_eap_type = EAP_TYPE_NONE;
 157         }
 158
 159
 160         if (eap_tls_ssl_init(sm, &data->ssl, config)) {
 161                 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to initialize SSL.");
 162                 eap_ttls_deinit(sm, data);
 163                 return NULL;
 164         }
 165
 166         return data;
 167 }
 168
 169
 170 static void eap_ttls_deinit(struct eap_sm *sm, void *priv)
 171 {
 172         struct eap_ttls_data *data = priv;
 173         if (data == NULL)
 174                 return;
 175         if (data->phase2_priv && data->phase2_method)
 176                 data->phase2_method->deinit(sm, data->phase2_priv);
 177         free(data->phase2_eap_types);
 178         eap_tls_ssl_deinit(sm, &data->ssl);
 179         free(data->key_data);
 180         free(data->pending_phase2_req);
 181         free(data);
 182 }
 183
 184
 185 static int eap_ttls_encrypt(struct eap_sm *sm, struct eap_ttls_data *data,
 186                             int id, u8 *plain, size_t plain_len,
 187                             u8 **out_data, size_t *out_len)
 188 {
 189         int res;
 190         u8 *pos;
 191         struct eap_hdr *resp;
 192
 193         /* TODO: add support for fragmentation, if needed. This will need to
 194          * add TLS Message Length field, if the frame is fragmented. */
 195         resp = malloc(sizeof(struct eap_hdr) + 2 + data->ssl.tls_out_limit);
 196         if (resp == NULL)
 197                 return -1;
 198
 199         resp->code = EAP_CODE_RESPONSE;
 200         resp->identifier = id;
 201
 202         pos = (u8 *) (resp + 1);
 203         *pos++ = EAP_TYPE_TTLS;
 204         *pos++ = 0;
 205
 206         res = tls_connection_encrypt(sm->ssl_ctx, data->ssl.conn,
 207                                      plain, plain_len,
 208                                      pos, data->ssl.tls_out_limit);
 209         if (res < 0) {
 210                 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to encrypt Phase 2 "
 211                            "data");
 212                 free(resp);
 213                 return -1;
 214         }
 215
 216         *out_len = sizeof(struct eap_hdr) + 2 + res;
 217         resp->length = host_to_be16(*out_len);
 218         *out_data = (u8 *) resp;
 219         return 0;
 220 }
 221
 222
 223 static u8 * eap_ttls_avp_hdr(u8 *avphdr, u32 avp_code, u32 vendor_id,
 224                              int mandatory, size_t len)
 225 {
 226         struct ttls_avp_vendor *avp;
 227         u8 flags;
 228         size_t hdrlen;
 229
 230         avp = (struct ttls_avp_vendor *) avphdr;
 231         flags = mandatory ? AVP_FLAGS_MANDATORY : 0;
 232         if (vendor_id) {
 233                 flags |= AVP_FLAGS_VENDOR;
 234                 hdrlen = sizeof(*avp);
 235                 avp->vendor_id = host_to_be32(vendor_id);
 236         } else {
 237                 hdrlen = sizeof(struct ttls_avp);
 238         }
 239
 240         avp->avp_code = host_to_be32(avp_code);
 241         avp->avp_length = host_to_be32((flags << 24) | (hdrlen + len));
 242
 243         return avphdr + hdrlen;
 244 }
 245
 246
 247 static u8 * eap_ttls_avp_add(u8 *start, u8 *avphdr, u32 avp_code,
 248                              u32 vendor_id, int mandatory,
 249                              u8 *data, size_t len)
 250 {
 251         u8 *pos;
 252         pos = eap_ttls_avp_hdr(avphdr, avp_code, vendor_id, mandatory, len);
 253         memcpy(pos, data, len);
 254         pos += len;
 255         AVP_PAD(start, pos);
 256         return pos;
 257 }
 258
 259
 260 static int eap_ttls_avp_encapsulate(u8 **resp, size_t *resp_len, u32 avp_code,
 261                                     int mandatory)
 262 {
 263         u8 *avp, *pos;
 264
 265         avp = malloc(sizeof(struct ttls_avp) + *resp_len + 4);
 266         if (avp == NULL) {
 267                 free(*resp);
 268                 *resp = NULL;
 269                 *resp_len = 0;
 270                 return -1;
 271         }
 272
 273         pos = eap_ttls_avp_hdr(avp, avp_code, 0, mandatory, *resp_len);
 274         memcpy(pos, *resp, *resp_len);
 275         pos += *resp_len;
 276         AVP_PAD(avp, pos);
 277         free(*resp);
 278         *resp = avp;
 279         *resp_len = pos - avp;
 280         return 0;
 281 }
 282
 283
 284 static int eap_ttls_phase2_nak(struct eap_sm *sm,
 285                                struct eap_ttls_data *data,
 286                                struct eap_hdr *hdr,
 287                                u8 **resp, size_t *resp_len)
 288 {
 289         struct eap_hdr *resp_hdr;
 290         u8 *pos = (u8 *) (hdr + 1);
 291
 292         wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 Request: Nak type=%d", *pos);
 293         wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Allowed Phase2 EAP types",
 294                     data->phase2_eap_types, data->num_phase2_eap_types);
 295         *resp_len = sizeof(struct eap_hdr) + 1 + data->num_phase2_eap_types;
 296         *resp = malloc(*resp_len);
 297         if (*resp == NULL)
 298                 return -1;
 299
 300         resp_hdr = (struct eap_hdr *) (*resp);
 301         resp_hdr->code = EAP_CODE_RESPONSE;
 302         resp_hdr->identifier = hdr->identifier;
 303         resp_hdr->length = host_to_be16(*resp_len);
 304         pos = (u8 *) (resp_hdr + 1);
 305         *pos++ = EAP_TYPE_NAK;
 306         memcpy(pos, data->phase2_eap_types, data->num_phase2_eap_types);
 307
 308         return 0;
 309 }
 310
 311
 312 static int eap_ttls_phase2_request_eap(struct eap_sm *sm,
 313                                        struct eap_ttls_data *data,
 314                                        struct eap_method_ret *ret,
 315                                        struct eap_hdr *req,
 316                                        struct eap_hdr *hdr,
 317                                        u8 **resp, size_t *resp_len)
 318 {
 319         size_t len = be_to_host16(hdr->length);
 320         u8 *pos;
 321         struct eap_method_ret iret;
 322         struct wpa_ssid *config = eap_get_config(sm);
 323
 324         if (len <= sizeof(struct eap_hdr)) {
 325                 wpa_printf(MSG_INFO, "EAP-TTLS: too short "
 326                            "Phase 2 request (len=%lu)", (unsigned long) len);
 327                 return -1;
 328         }
 329         pos = (u8 *) (hdr + 1);
 330         wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP Request: type=%d", *pos);
 331         switch (*pos) {
 332         case EAP_TYPE_IDENTITY:
 333                 *resp = eap_sm_buildIdentity(sm, req->identifier, resp_len, 1);
 334                 break;
 335         default:
 336                 if (data->phase2_eap_type == EAP_TYPE_NONE) {
 337                         int i;
 338                         for (i = 0; i < data->num_phase2_eap_types; i++) {
 339                                 if (data->phase2_eap_types[i] != *pos)
 340                                         continue;
 341
 342                                 data->phase2_eap_type = *pos;
 343                                 wpa_printf(MSG_DEBUG, "EAP-TTLS: Selected "
 344                                            "Phase 2 EAP method %d",
 345                                            data->phase2_eap_type);
 346                                 break;
 347                         }
 348                 }
 349                 if (*pos != data->phase2_eap_type || *pos == EAP_TYPE_NONE) {
 350                         if (eap_ttls_phase2_nak(sm, data, hdr, resp, resp_len))
 351                                 return -1;
 352                         break;
 353                 }
 354
 355                 if (data->phase2_priv == NULL) {
 356                         data->phase2_method = eap_sm_get_eap_methods(*pos);
 357                         if (data->phase2_method) {
 358                                 sm->init_phase2 = 1;
 359                                 data->phase2_priv =
 360                                         data->phase2_method->init(sm);
 361                                 sm->init_phase2 = 0;
 362                         }
 363                 }
 364                 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
 365                         wpa_printf(MSG_INFO, "EAP-TTLS: failed to initialize "
 366                                    "Phase 2 EAP method %d", *pos);
 367                         return -1;
 368                 }
 369                 memset(&iret, 0, sizeof(iret));
 370                 *resp = data->phase2_method->process(sm, data->phase2_priv,
 371                                                      &iret, (u8 *) hdr, len,
 372                                                      resp_len);
 373                 if ((iret.methodState == METHOD_DONE ||
 374                      iret.methodState == METHOD_MAY_CONT) &&
 375                     (iret.decision == DECISION_UNCOND_SUCC ||
 376                      iret.decision == DECISION_COND_SUCC ||
 377                      iret.decision == DECISION_FAIL)) {
 378                         ret->methodState = iret.methodState;
 379                         ret->decision = iret.decision;
 380                 }
 381                 break;
 382         }
 383
 384         if (*resp == NULL &&
 385             (config->pending_req_identity || config->pending_req_password ||
 386              config->pending_req_otp)) {
 387                 return 0;
 388         }
 389
 390         if (*resp == NULL)
 391                 return -1;
 392
 393         wpa_hexdump(MSG_DEBUG, "EAP-TTLS: AVP encapsulate EAP Response",
 394                     *resp, *resp_len);
 395         return eap_ttls_avp_encapsulate(resp, resp_len,
 396                                         RADIUS_ATTR_EAP_MESSAGE, 1);
 397 }
 398
 399
 400 static int eap_ttls_phase2_request_mschapv2(struct eap_sm *sm,
 401                                             struct eap_ttls_data *data,
 402                                             struct eap_method_ret *ret,
 403                                             struct eap_hdr *req,
 404                                             struct eap_hdr *hdr,
 405                                             u8 **resp, size_t *resp_len)
 406 {
 407         struct wpa_ssid *config = eap_get_config(sm);
 408         u8 *buf, *pos, *challenge, *username, *peer_challenge;
 409         size_t username_len;
 410         int i;
 411
 412         wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAPV2 Request");
 413
 414         /* MSCHAPv2 does not include optional domain name in the
 415          * challenge-response calculation, so remove domain prefix
 416          * (if present). */
 417         username = config->identity;
 418         username_len = config->identity_len;
 419         pos = username;
 420         for (i = 0; i < username_len; i++) {
 421                 if (username[i] == '\\') {
 422                         username_len -= i + 1;
 423                         username += i + 1;
 424                         break;
 425                 }
 426         }
 427
 428         pos = buf = malloc(config->identity_len + 1000);
 429         if (buf == NULL) {
 430                 wpa_printf(MSG_ERROR,
 431                            "EAP-TTLS/MSCHAPV2: Failed to allocate memory");
 432                 return -1;
 433         }
 434
 435         /* User-Name */
 436         pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
 437                                config->identity, config->identity_len);
 438
 439         /* MS-CHAP-Challenge */
 440         challenge = eap_tls_derive_key(sm, &data->ssl, "ttls challenge",
 441                                        EAP_TTLS_MSCHAPV2_CHALLENGE_LEN * 2 +
 442                                        1);
 443         if (challenge == NULL) {
 444                 free(buf);
 445                 wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to derive "
 446                            "implicit challenge");
 447                 return -1;
 448         }
 449         peer_challenge = challenge + 1 + EAP_TTLS_MSCHAPV2_CHALLENGE_LEN;
 450
 451         pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE,
 452                                RADIUS_VENDOR_ID_MICROSOFT, 1,
 453                                challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
 454
 455         /* MS-CHAP2-Response */
 456         pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP2_RESPONSE,
 457                                RADIUS_VENDOR_ID_MICROSOFT, 1,
 458                                EAP_TTLS_MSCHAPV2_RESPONSE_LEN);
 459         data->ident = challenge[EAP_TTLS_MSCHAPV2_CHALLENGE_LEN];
 460         *pos++ = data->ident;
 461         *pos++ = 0; /* Flags */
 462         memcpy(pos, peer_challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
 463         pos += EAP_TTLS_MSCHAPV2_CHALLENGE_LEN;
 464         memset(pos, 0, 8); /* Reserved, must be zero */
 465         pos += 8;
 466         wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAPV2: implicit auth_challenge",
 467                     challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
 468         wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAPV2: peer_challenge",
 469                     peer_challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
 470         wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: MSCHAPV2 username",
 471                           username, username_len);
 472         wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: MSCHAPV2 password",
 473                               config->password, config->password_len);
 474         generate_nt_response(challenge, peer_challenge,
 475                              username, username_len,
 476                              config->password, config->password_len,
 477                              pos);
 478         wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAPV2 response", pos, 24);
 479         generate_authenticator_response(config->password, config->password_len,
 480                                         peer_challenge, challenge,
 481                                         username, username_len,
 482                                         pos, data->auth_response);
 483         data->auth_response_valid = 1;
 484
 485         pos += 24;
 486         free(challenge);
 487         AVP_PAD(buf, pos);
 488
 489         *resp = buf;
 490         *resp_len = pos - buf;
 491
 492         if (sm->workaround) {
 493                 /* At least FreeRADIUS seems to be terminating
 494                  * EAP-TTLS/MSHCAPV2 without the expected MS-CHAP-v2 Success
 495                  * packet. */
 496                 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: EAP workaround - "
 497                            "allow success without tunneled response");
 498                 ret->methodState = METHOD_MAY_CONT;
 499                 ret->decision = DECISION_COND_SUCC;
 500         }
 501
 502         return 0;
 503 }
 504
 505
 506 static int eap_ttls_phase2_request_mschap(struct eap_sm *sm,
 507                                           struct eap_ttls_data *data,
 508                                           struct eap_method_ret *ret,
 509                                           struct eap_hdr *req,
 510                                           struct eap_hdr *hdr,
 511                                           u8 **resp, size_t *resp_len)
 512 {
 513         struct wpa_ssid *config = eap_get_config(sm);
 514         u8 *buf, *pos, *challenge;
 515
 516         wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAP Request");
 517
 518         pos = buf = malloc(config->identity_len + 1000);
 519         if (buf == NULL) {
 520                 wpa_printf(MSG_ERROR,
 521                            "EAP-TTLS/MSCHAP: Failed to allocate memory");
 522                 return -1;
 523         }
 524
 525         /* User-Name */
 526         pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
 527                                config->identity, config->identity_len);
 528
 529         /* MS-CHAP-Challenge */
 530         challenge = eap_tls_derive_key(sm, &data->ssl, "ttls challenge",
 531                                        EAP_TLS_KEY_LEN);
 532         if (challenge == NULL) {
 533                 free(buf);
 534                 wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAP: Failed to derive "
 535                            "implicit challenge");
 536                 return -1;
 537         }
 538
 539         pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE,
 540                                RADIUS_VENDOR_ID_MICROSOFT, 1,
 541                                challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN);
 542
 543         /* MS-CHAP-Response */
 544         pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP_RESPONSE,
 545                                RADIUS_VENDOR_ID_MICROSOFT, 1,
 546                                EAP_TTLS_MSCHAP_RESPONSE_LEN);
 547         data->ident = challenge[EAP_TTLS_MSCHAP_CHALLENGE_LEN];
 548         *pos++ = data->ident;
 549         *pos++ = 1; /* Flags: Use NT style passwords */
 550         memset(pos, 0, 24); /* LM-Response */
 551         pos += 24;
 552         nt_challenge_response(challenge,
 553                               config->password, config->password_len,
 554                               pos); /* NT-Response */
 555         wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password",
 556                               config->password, config->password_len);
 557         wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP implicit challenge",
 558                     challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN);
 559         wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP response", pos, 24);
 560         pos += 24;
 561         free(challenge);
 562         AVP_PAD(buf, pos);
 563
 564         *resp = buf;
 565         *resp_len = pos - buf;
 566
 567         /* EAP-TTLS/MSCHAP does not provide tunneled success notification, so
 568          * assume that Phase2 succeeds. */
 569         ret->methodState = METHOD_DONE;
 570         ret->decision = DECISION_COND_SUCC;
 571
 572         return 0;
 573 }
 574
 575
 576 static int eap_ttls_phase2_request_pap(struct eap_sm *sm,
 577                                        struct eap_ttls_data *data,
 578                                        struct eap_method_ret *ret,
 579                                        struct eap_hdr *req,
 580                                        struct eap_hdr *hdr,
 581                                        u8 **resp, size_t *resp_len)
 582 {
 583         struct wpa_ssid *config = eap_get_config(sm);
 584         u8 *buf, *pos;
 585         size_t pad;
 586
 587         wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 PAP Request");
 588
 589         pos = buf = malloc(config->identity_len + config->password_len + 100);
 590         if (buf == NULL) {
 591                 wpa_printf(MSG_ERROR,
 592                            "EAP-TTLS/PAP: Failed to allocate memory");
 593                 return -1;
 594         }
 595
 596         /* User-Name */
 597         pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
 598                                config->identity, config->identity_len);
 599
 600         /* User-Password; in RADIUS, this is encrypted, but EAP-TTLS encrypts
 601          * the data, so no separate encryption is used in the AVP itself.
 602          * However, the password is padded to obfuscate its length. */
 603         pad = (16 - (config->password_len & 15)) & 15;
 604         pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_USER_PASSWORD, 0, 1,
 605                                config->password_len + pad);
 606         memcpy(pos, config->password, config->password_len);
 607         pos += config->password_len;
 608         memset(pos, 0, pad);
 609         pos += pad;
 610         AVP_PAD(buf, pos);
 611
 612         *resp = buf;
 613         *resp_len = pos - buf;
 614
 615         /* EAP-TTLS/PAP does not provide tunneled success notification, so
 616          * assume that Phase2 succeeds. */
 617         ret->methodState = METHOD_DONE;
 618         ret->decision = DECISION_COND_SUCC;
 619
 620         return 0;
 621 }
 622
 623
 624 static int eap_ttls_phase2_request_chap(struct eap_sm *sm,
 625                                         struct eap_ttls_data *data,
 626                                         struct eap_method_ret *ret,
 627                                         struct eap_hdr *req,
 628                                         struct eap_hdr *hdr,
 629                                         u8 **resp, size_t *resp_len)
 630 {
 631         struct wpa_ssid *config = eap_get_config(sm);
 632         u8 *buf, *pos, *challenge;
 633         MD5_CTX context;
 634
 635         wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 CHAP Request");
 636
 637         pos = buf = malloc(config->identity_len + 1000);
 638         if (buf == NULL) {
 639                 wpa_printf(MSG_ERROR,
 640                            "EAP-TTLS/CHAP: Failed to allocate memory");
 641                 return -1;
 642         }
 643
 644         /* User-Name */
 645         pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
 646                                config->identity, config->identity_len);
 647
 648         /* CHAP-Challenge */
 649         challenge = eap_tls_derive_key(sm, &data->ssl, "ttls challenge",
 650                                        EAP_TLS_KEY_LEN);
 651         if (challenge == NULL) {
 652                 free(buf);
 653                 wpa_printf(MSG_ERROR, "EAP-TTLS/CHAP: Failed to derive "
 654                            "implicit challenge");
 655                 return -1;
 656         }
 657
 658         pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_CHAP_CHALLENGE, 0, 1,
 659                                challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
 660
 661         /* CHAP-Password */
 662         pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_CHAP_PASSWORD, 0, 1,
 663                                1 + EAP_TTLS_CHAP_PASSWORD_LEN);
 664         data->ident = challenge[EAP_TTLS_CHAP_CHALLENGE_LEN];
 665         *pos++ = data->ident;
 666
 667         /* MD5(Ident + Password + Challenge) */
 668         MD5Init(&context);
 669         MD5Update(&context, &data->ident, 1);
 670         MD5Update(&context, config->password, config->password_len);
 671         MD5Update(&context, challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
 672         MD5Final(pos, &context);
 673
 674         wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: CHAP username",
 675                           config->identity, config->identity_len);
 676         wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: CHAP password",
 677                               config->password, config->password_len);
 678         wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP implicit challenge",
 679                     challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
 680         wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP password",
 681                     pos, EAP_TTLS_CHAP_PASSWORD_LEN);
 682         pos += EAP_TTLS_CHAP_PASSWORD_LEN;
 683         free(challenge);
 684         AVP_PAD(buf, pos);
 685
 686         *resp = buf;
 687         *resp_len = pos - buf;
 688
 689         /* EAP-TTLS/CHAP does not provide tunneled success notification, so
 690          * assume that Phase2 succeeds. */
 691         ret->methodState = METHOD_DONE;
 692         ret->decision = DECISION_COND_SUCC;
 693
 694         return 0;
 695 }
 696
 697
 698 static int eap_ttls_phase2_request(struct eap_sm *sm,
 699                                    struct eap_ttls_data *data,
 700                                    struct eap_method_ret *ret,
 701                                    struct eap_hdr *req,
 702                                    struct eap_hdr *hdr,
 703                                    u8 **resp, size_t *resp_len)
 704 {
 705         struct wpa_ssid *config = eap_get_config(sm);
 706         int res = 0;
 707
 708         if (data->phase2_type == EAP_TTLS_PHASE2_MSCHAPV2 ||
 709             data->phase2_type == EAP_TTLS_PHASE2_MSCHAP ||
 710             data->phase2_type == EAP_TTLS_PHASE2_PAP ||
 711             data->phase2_type == EAP_TTLS_PHASE2_CHAP) {
 712                 if (config == NULL || config->identity == NULL) {
 713                         wpa_printf(MSG_INFO,
 714                                    "EAP-TTLS: Identity not configured");
 715                         eap_sm_request_identity(sm, config);
 716                         if (config->password == NULL)
 717                                 eap_sm_request_password(sm, config);
 718                         return 0;
 719                 }
 720
 721                 if (config->password == NULL) {
 722                         wpa_printf(MSG_INFO,
 723                                    "EAP-TTLS: Password not configured");
 724                         eap_sm_request_password(sm, config);
 725                         return 0;
 726                 }
 727         }
 728
 729         switch (data->phase2_type) {
 730         case EAP_TTLS_PHASE2_EAP:
 731                 res = eap_ttls_phase2_request_eap(sm, data, ret, req, hdr,
 732                                                   resp, resp_len);
 733                 break;
 734         case EAP_TTLS_PHASE2_MSCHAPV2:
 735                 res = eap_ttls_phase2_request_mschapv2(sm, data, ret, req, hdr,
 736                                                        resp, resp_len);
 737                 break;
 738         case EAP_TTLS_PHASE2_MSCHAP:
 739                 res = eap_ttls_phase2_request_mschap(sm, data, ret, req, hdr,
 740                                                      resp, resp_len);
 741                 break;
 742         case EAP_TTLS_PHASE2_PAP:
 743                 res = eap_ttls_phase2_request_pap(sm, data, ret, req, hdr,
 744                                                   resp, resp_len);
 745                 break;
 746         case EAP_TTLS_PHASE2_CHAP:
 747                 res = eap_ttls_phase2_request_chap(sm, data, ret, req, hdr,
 748                                                    resp, resp_len);
 749                 break;
 750         default:
 751                 wpa_printf(MSG_ERROR, "EAP-TTLS: Phase 2 - Unknown");
 752                 res = -1;
 753                 break;
 754         }
 755
 756         if (res < 0) {
 757                 ret->methodState = METHOD_DONE;
 758                 ret->decision = DECISION_FAIL;
 759         }
 760
 761         return res;
 762 }
 763
 764
 765 static int eap_ttls_decrypt(struct eap_sm *sm, struct eap_ttls_data *data,
 766                             struct eap_method_ret *ret, struct eap_hdr *req,
 767                             u8 *in_data, size_t in_len,
 768                             u8 **out_data, size_t *out_len)
 769 {
 770         u8 *in_decrypted = NULL, *pos;
 771         int buf_len, len_decrypted = 0, len, left, retval = 0, res;
 772         struct eap_hdr *hdr = NULL;
 773         u8 *resp = NULL, *mschapv2 = NULL, *eapdata = NULL;
 774         size_t resp_len, eap_len = 0;
 775         struct ttls_avp *avp;
 776         u8 recv_response[20];
 777         int mschapv2_error = 0;
 778         struct wpa_ssid *config = eap_get_config(sm);
 779
 780         wpa_printf(MSG_DEBUG, "EAP-TTLS: received %lu bytes encrypted data for"
 781                    " Phase 2", (unsigned long) in_len);
 782
 783         if (data->pending_phase2_req) {
 784                 wpa_printf(MSG_DEBUG, "EAP-TTLS: Pending Phase 2 request - "
 785                            "skip decryption and use old data");
 786                 /* Clear TLS reassembly state. */
 787                 free(data->ssl.tls_in);
 788                 data->ssl.tls_in = NULL;
 789                 data->ssl.tls_in_len = 0;
 790                 data->ssl.tls_in_left = 0;
 791                 data->ssl.tls_in_total = 0;
 792
 793                 in_decrypted = data->pending_phase2_req;
 794                 data->pending_phase2_req = NULL;
 795                 len_decrypted = data->pending_phase2_req_len;
 796                 if (data->pending_phase2_req_len == 0) {
 797                         free(in_decrypted);
 798                         in_decrypted = NULL;
 799                         goto fake_req_identity;
 800                 }
 801                 goto continue_req;
 802         }
 803
 804         if (in_len == 0 && data->phase2_start) {
 805                 data->phase2_start = 0;
 806                 /* EAP-TTLS does not use Phase2 on fast re-auth; this must be
 807                  * done only if TLS part was indeed resuming a previous
 808                  * session. Most Authentication Servers terminate EAP-TTLS
 809                  * before reaching this point, but some do not. Make
 810                  * wpa_supplicant stop phase 2 here, if needed. */
 811                 if (data->reauth &&
 812                     tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
 813                         wpa_printf(MSG_DEBUG, "EAP-TTLS: Session resumption - "
 814                                    "skip phase 2");
 815                         *out_data = eap_tls_build_ack(&data->ssl, out_len,
 816                                                       req->identifier,
 817                                                       EAP_TYPE_TTLS, 0);
 818                         ret->methodState = METHOD_DONE;
 819                         ret->decision = DECISION_UNCOND_SUCC;
 820                         data->phase2_success = 1;
 821                         return 0;
 822                 }
 823         fake_req_identity:
 824                 wpa_printf(MSG_DEBUG, "EAP-TTLS: empty data in beginning of "
 825                            "Phase 2 - use fake EAP-Request Identity");
 826                 buf_len = sizeof(*hdr) + 1;
 827                 in_decrypted = malloc(buf_len);
 828                 if (in_decrypted == NULL) {
 829                         wpa_printf(MSG_WARNING, "EAP-TTLS: failed to allocate "
 830                                    "memory for fake EAP-Identity Request");
 831                         retval = -1;
 832                         goto done;
 833                 }
 834                 hdr = (struct eap_hdr *) in_decrypted;
 835                 hdr->code = EAP_CODE_REQUEST;
 836                 hdr->identifier = 0;
 837                 hdr->length = host_to_be16(sizeof(*hdr) + 1);
 838                 in_decrypted[sizeof(*hdr)] = EAP_TYPE_IDENTITY;
 839                 goto process_eap;
 840         }
 841
 842         res = eap_tls_data_reassemble(sm, &data->ssl, &in_data, &in_len);
 843         if (res < 0 || res == 1) {
 844                 retval = res;
 845                 goto done;
 846         }
 847
 848         buf_len = in_len;
 849         if (data->ssl.tls_in_total > buf_len)
 850                 buf_len = data->ssl.tls_in_total;
 851         in_decrypted = malloc(buf_len);
 852         if (in_decrypted == NULL) {
 853                 free(data->ssl.tls_in);
 854                 data->ssl.tls_in = NULL;
 855                 data->ssl.tls_in_len = 0;
 856                 wpa_printf(MSG_WARNING, "EAP-TTLS: failed to allocate memory "
 857                            "for decryption");
 858                 retval = -1;
 859                 goto done;
 860         }
 861
 862         len_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
 863                                                in_data, in_len,
 864                                                in_decrypted, buf_len);
 865         free(data->ssl.tls_in);
 866         data->ssl.tls_in = NULL;
 867         data->ssl.tls_in_len = 0;
 868         if (len_decrypted < 0) {
 869                 wpa_printf(MSG_INFO, "EAP-TTLS: Failed to decrypt Phase 2 "
 870                            "data");
 871                 retval = -1;
 872                 goto done;
 873         }
 874
 875 continue_req:
 876         data->phase2_start = 0;
 877
 878         wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Decrypted Phase 2 AVPs",
 879                     in_decrypted, len_decrypted);
 880         if (len_decrypted < sizeof(struct ttls_avp)) {
 881                 wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 AVP frame"
 882                            " len=%d expected %lu or more - dropped",
 883                            len_decrypted,
 884                            (unsigned long) sizeof(struct ttls_avp));
 885                 retval = -1;
 886                 goto done;
 887         }
 888
 889         /* Parse AVPs */
 890         pos = in_decrypted;
 891         left = len_decrypted;
 892         mschapv2 = NULL;
 893
 894         while (left > 0) {
 895                 u32 avp_code, avp_length, vendor_id = 0;
 896                 u8 avp_flags, *dpos;
 897                 size_t pad, dlen;
 898                 avp = (struct ttls_avp *) pos;
 899                 avp_code = be_to_host32(avp->avp_code);
 900                 avp_length = be_to_host32(avp->avp_length);
 901                 avp_flags = (avp_length >> 24) & 0xff;
 902                 avp_length &= 0xffffff;
 903                 wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP: code=%d flags=0x%02x "
 904                            "length=%d", (int) avp_code, avp_flags,
 905                            (int) avp_length);
 906                 if (avp_length > left) {
 907                         wpa_printf(MSG_WARNING, "EAP-TTLS: AVP overflow "
 908                                    "(len=%d, left=%d) - dropped",
 909                                    (int) avp_length, left);
 910                         retval = -1;
 911                         goto done;
 912                 }
 913                 dpos = (u8 *) (avp + 1);
 914                 dlen = avp_length - sizeof(*avp);
 915                 if (avp_flags & AVP_FLAGS_VENDOR) {
 916                         if (dlen < 4) {
 917                                 wpa_printf(MSG_WARNING, "EAP-TTLS: vendor AVP "
 918                                            "underflow");
 919                                 retval = -1;
 920                                 goto done;
 921                         }
 922                         vendor_id = be_to_host32(* (u32 *) dpos);
 923                         wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP vendor_id %d",
 924                                    (int) vendor_id);
 925                         dpos += 4;
 926                         dlen -= 4;
 927                 }
 928
 929                 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: AVP data", dpos, dlen);
 930
 931                 if (vendor_id == 0 && avp_code == RADIUS_ATTR_EAP_MESSAGE) {
 932                         wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP - EAP Message");
 933                         if (eapdata == NULL) {
 934                                 eapdata = malloc(dlen);
 935                                 if (eapdata == NULL) {
 936                                         retval = -1;
 937                                         wpa_printf(MSG_WARNING, "EAP-TTLS: "
 938                                                    "failed to allocate memory "
 939                                                    "for Phase 2 EAP data");
 940                                         goto done;
 941                                 }
 942                                 memcpy(eapdata, dpos, dlen);
 943                                 eap_len = dlen;
 944                         } else {
 945                                 u8 *neweap = realloc(eapdata, eap_len + dlen);
 946                                 if (neweap == NULL) {
 947                                         retval = -1;
 948                                         wpa_printf(MSG_WARNING, "EAP-TTLS: "
 949                                                    "failed to allocate memory "
 950                                                    "for Phase 2 EAP data");
 951                                         goto done;
 952                                 }
 953                                 memcpy(neweap + eap_len, dpos, dlen);
 954                                 eapdata = neweap;
 955                                 eap_len += dlen;
 956                         }
 957                 } else if (vendor_id == 0 &&
 958                            avp_code == RADIUS_ATTR_REPLY_MESSAGE) {
 959                         /* This is an optional message that can be displayed to
 960                          * the user. */
 961                         wpa_hexdump_ascii(MSG_DEBUG,
 962                                           "EAP-TTLS: AVP - Reply-Message",
 963                                           dpos, dlen);
 964                 } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
 965                            avp_code == RADIUS_ATTR_MS_CHAP2_SUCCESS) {
 966                         wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: "
 967                                           "MS-CHAP2-Success", dpos, dlen);
 968                         if (dlen != 43) {
 969                                 wpa_printf(MSG_WARNING, "EAP-TTLS: Unexpected "
 970                                            "MS-CHAP2-Success length "
 971                                            "(len=%lu, expected 43)",
 972                                            (unsigned long) dlen);
 973                                 retval = -1;
 974                                 break;
 975                         }
 976                         mschapv2 = dpos;
 977                 } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
 978                            avp_code == RADIUS_ATTR_MS_CHAP_ERROR) {
 979                         wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: "
 980                                           "MS-CHAP-Error", dpos, dlen);
 981                         mschapv2_error = 1;
 982                 } else if (avp_flags & AVP_FLAGS_MANDATORY) {
 983                         wpa_printf(MSG_WARNING, "EAP-TTLS: Unsupported "
 984                                    "mandatory AVP code %d vendor_id %d - "
 985                                    "dropped", (int) avp_code, (int) vendor_id);
 986                         retval = -1;
 987                         goto done;
 988                 } else {
 989                         wpa_printf(MSG_DEBUG, "EAP-TTLS: Ignoring unsupported "
 990                                    "AVP code %d vendor_id %d",
 991                                    (int) avp_code, (int) vendor_id);
 992                 }
 993
 994                 pad = (4 - (avp_length & 3)) & 3;
 995                 pos += avp_length + pad;
 996                 left -= avp_length + pad;
 997         }
 998
 999         switch (data->phase2_type) {
1000         case EAP_TTLS_PHASE2_EAP:
1001                 if (eapdata == NULL) {
1002                         wpa_printf(MSG_WARNING, "EAP-TTLS: No EAP Message in "
1003                                    "the packet - dropped");
1004                         retval = -1;
1005                         goto done;
1006                 }
1007
1008                 wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP",
1009                             eapdata, eap_len);
1010                 hdr = (struct eap_hdr *) eapdata;
1011
1012                 if (eap_len < sizeof(*hdr)) {
1013                         wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 "
1014                                    "EAP frame (len=%lu, expected %lu or more) "
1015                                    "- dropped", (unsigned long) eap_len,
1016                                    (unsigned long) sizeof(*hdr));
1017                         retval = -1;
1018                         goto done;
1019                 }
1020                 len = be_to_host16(hdr->length);
1021                 if (len > eap_len) {
1022                         wpa_printf(MSG_INFO, "EAP-TTLS: Length mismatch in "
1023                                    "Phase 2 EAP frame (EAP hdr len=%d, EAP "
1024                                    "data len in AVP=%lu)", len,
1025                                    (unsigned long) eap_len);
1026                         retval = -1;
1027                         goto done;
1028                 }
1029                 wpa_printf(MSG_DEBUG, "EAP-TTLS: received Phase 2: code=%d "
1030                            "identifier=%d length=%d",
1031                            hdr->code, hdr->identifier, len);
1032         process_eap:
1033                 switch (hdr->code) {
1034                 case EAP_CODE_REQUEST:
1035                         if (eap_ttls_phase2_request(sm, data, ret, req, hdr,
1036                                                     &resp, &resp_len)) {
1037                                 wpa_printf(MSG_INFO, "EAP-TTLS: Phase2 "
1038                                            "Request processing failed");
1039                                 retval = -1;
1040                                 goto done;
1041                         }
1042                         break;
1043                 default:
1044                         wpa_printf(MSG_INFO, "EAP-TTLS: Unexpected code=%d in "
1045                                    "Phase 2 EAP header", hdr->code);
1046                         retval = -1;
1047                         break;
1048                 }
1049                 break;
1050         case EAP_TTLS_PHASE2_MSCHAPV2:
1051                 if (mschapv2_error) {
1052                         wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Received "
1053                                    "MS-CHAP-Error - failed");
1054                         ret->methodState = METHOD_DONE;
1055                         ret->decision = DECISION_FAIL;
1056                         *out_data = eap_tls_build_ack(&data->ssl, out_len,
1057                                                       req->identifier,
1058                                                       EAP_TYPE_TTLS, 0);
1059                         break;
1060                 }
1061
1062                 if (mschapv2 == NULL) {
1063                         wpa_printf(MSG_WARNING, "EAP-TTLS: no MS-CHAP2-Success"
1064                                    " AVP received for Phase2 MSCHAPV2");
1065                         retval = -1;
1066                         break;
1067                 }
1068                 if (mschapv2[0] != data->ident) {
1069                         wpa_printf(MSG_WARNING, "EAP-TTLS: Ident mismatch "
1070                                    "for Phase 2 MSCHAPV2 (received Ident "
1071                                    "0x%02x, expected 0x%02x)",
1072                                    mschapv2[0], data->ident);
1073                         retval = -1;
1074                         break;
1075                 }
1076                 if (!data->auth_response_valid ||
1077                     mschapv2[1] != 'S' || mschapv2[2] != '=' ||
1078                     hexstr2bin((char *) (mschapv2 + 3), recv_response, 20) ||
1079                     memcmp(data->auth_response, recv_response, 20) != 0) {
1080                         wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid "
1081                                    "authenticator response in Phase 2 "
1082                                    "MSCHAPV2 success request");
1083                         retval = -1;
1084                         break;
1085                 }
1086
1087                 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 MSCHAPV2 "
1088                            "authentication succeeded");
1089                 ret->methodState = METHOD_DONE;
1090                 ret->decision = DECISION_UNCOND_SUCC;
1091                 data->phase2_success = 1;
1092
1093                 /* Reply with empty data; authentication server will reply
1094                  * with EAP-Success after this. */
1095                 retval = 1;
1096                 goto done;
1097         case EAP_TTLS_PHASE2_MSCHAP:
1098         case EAP_TTLS_PHASE2_PAP:
1099         case EAP_TTLS_PHASE2_CHAP:
1100                 /* EAP-TTLS/{MSCHAP,PAP,CHAP} should not send any TLS tunneled
1101                  * requests to the supplicant */
1102                 wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received unexpected "
1103                            "tunneled data");
1104                 retval = -1;
1105                 break;
1106         }
1107
1108         if (resp) {
1109                 wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Encrypting Phase 2 data",
1110                                 resp, resp_len);
1111
1112                 if (eap_ttls_encrypt(sm, data, req->identifier,
1113                                      resp, resp_len, out_data, out_len)) {
1114                         wpa_printf(MSG_INFO, "EAP-TTLS: Failed to encrypt "
1115                                    "a Phase 2 frame");
1116                 }
1117                 free(resp);
1118         } else if (config->pending_req_identity ||
1119                    config->pending_req_password ||
1120                    config->pending_req_otp) {
1121                 free(data->pending_phase2_req);
1122                 data->pending_phase2_req = malloc(len_decrypted);
1123                 if (data->pending_phase2_req) {
1124                         memcpy(data->pending_phase2_req, in_decrypted,
1125                                len_decrypted);
1126                         data->pending_phase2_req_len = len_decrypted;
1127                 }
1128         }
1129
1130 done:
1131         free(in_decrypted);
1132         free(eapdata);
1133
1134         if (retval < 0) {
1135                 ret->methodState = METHOD_DONE;
1136                 ret->decision = DECISION_FAIL;
1137         }
1138
1139         return retval;
1140 }
1141
1142
1143 static u8 * eap_ttls_process(struct eap_sm *sm, void *priv,
1144                              struct eap_method_ret *ret,
1145                              u8 *reqData, size_t reqDataLen,
1146                              size_t *respDataLen)
1147 {
1148         struct eap_hdr *req;
1149         int left, res;
1150         unsigned int tls_msg_len;
1151         u8 flags, *pos, *resp, id;
1152         struct eap_ttls_data *data = priv;
1153
1154         if (tls_get_errors(sm->ssl_ctx)) {
1155                 wpa_printf(MSG_INFO, "EAP-TTLS: TLS errors detected");
1156                 ret->ignore = TRUE;
1157                 return NULL;
1158         }
1159
1160         req = (struct eap_hdr *) reqData;
1161         pos = (u8 *) (req + 1);
1162         if (reqDataLen < sizeof(*req) + 2 || *pos != EAP_TYPE_TTLS ||
1163             (left = be_to_host16(req->length)) > reqDataLen) {
1164                 wpa_printf(MSG_INFO, "EAP-TTLS: Invalid frame");
1165                 ret->ignore = TRUE;
1166                 return NULL;
1167         }
1168         left -= sizeof(struct eap_hdr);
1169         id = req->identifier;
1170         pos++;
1171         flags = *pos++;
1172         left -= 2;
1173         wpa_printf(MSG_DEBUG, "EAP-TTLS: Received packet(len=%lu) - "
1174                    "Flags 0x%02x", (unsigned long) reqDataLen, flags);
1175         if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
1176                 if (left < 4) {
1177                         wpa_printf(MSG_INFO, "EAP-TTLS: Short frame with TLS "
1178                                    "length");
1179                         ret->ignore = TRUE;
1180                         return NULL;
1181                 }
1182                 tls_msg_len = (pos[0] << 24) | (pos[1] << 16) | (pos[2] << 8) |
1183                         pos[3];
1184                 wpa_printf(MSG_DEBUG, "EAP-TTLS: TLS Message Length: %d",
1185                            tls_msg_len);
1186                 if (data->ssl.tls_in_left == 0) {
1187                         data->ssl.tls_in_total = tls_msg_len;
1188                         data->ssl.tls_in_left = tls_msg_len;
1189                         free(data->ssl.tls_in);
1190                         data->ssl.tls_in = NULL;
1191                         data->ssl.tls_in_len = 0;
1192                 }
1193                 pos += 4;
1194                 left -= 4;
1195         }
1196
1197         ret->ignore = FALSE;
1198         ret->methodState = METHOD_CONT;
1199         ret->decision = DECISION_FAIL;
1200         ret->allowNotifications = TRUE;
1201
1202         if (flags & EAP_TLS_FLAGS_START) {
1203                 wpa_printf(MSG_DEBUG, "EAP-TTLS: Start");
1204                 /* draft-ietf-pppext-eap-ttls-03.txt, Ch. 8.1:
1205                  * EAP-TTLS Start packet may, in a future specification, be
1206                  * allowed to contain data. Client based on this draft version
1207                  * must ignore such data but must not reject the Start packet.
1208                  */
1209                 left = 0;
1210         }
1211
1212         resp = NULL;
1213         if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1214             !data->resuming) {
1215                 res = eap_ttls_decrypt(sm, data, ret, req, pos, left,
1216                                        &resp, respDataLen);
1217         } else {
1218                 res = eap_tls_process_helper(sm, &data->ssl, EAP_TYPE_TTLS, 0,
1219                                              id, pos, left,
1220                                              &resp, respDataLen);
1221
1222                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1223                         wpa_printf(MSG_DEBUG,
1224                                    "EAP-TTLS: TLS done, proceed to Phase 2");
1225                         if (data->resuming) {
1226                                 wpa_printf(MSG_DEBUG, "EAP-TTLS: fast reauth -"
1227                                            " may skip Phase 2");
1228                                 ret->decision = DECISION_COND_SUCC;
1229                                 ret->methodState = METHOD_MAY_CONT;
1230                         }
1231                         data->phase2_start = 1;
1232                         free(data->key_data);
1233                         data->key_data =
1234                                 eap_tls_derive_key(sm, &data->ssl,
1235                                                    "ttls keying material",
1236                                                    EAP_TLS_KEY_LEN);
1237                         if (data->key_data) {
1238                                 wpa_hexdump_key(MSG_DEBUG,
1239                                                 "EAP-TTLS: Derived key",
1240                                                 data->key_data,
1241                                                 EAP_TLS_KEY_LEN);
1242                         } else {
1243                                 wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to "
1244                                            "derive key");
1245                         }
1246
1247                         if (*respDataLen == 0) {
1248                                 if (eap_ttls_decrypt(sm, data, ret, req, NULL,
1249                                                      0, &resp, respDataLen)) {
1250                                         wpa_printf(MSG_WARNING, "EAP-TTLS: "
1251                                                    "failed to process early "
1252                                                    "start for Phase 2");
1253                                 }
1254                                 res = 0;
1255                         }
1256                         data->resuming = 0;
1257                 }
1258         }
1259
1260         if (ret->methodState == METHOD_DONE) {
1261                 ret->allowNotifications = FALSE;
1262                 if (ret->decision == DECISION_UNCOND_SUCC ||
1263                     ret->decision == DECISION_COND_SUCC) {
1264                         wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication "
1265                                    "completed successfully");
1266                         data->phase2_success = 1;
1267                 }
1268         } else if (sm->workaround && ret->methodState == METHOD_MAY_CONT &&
1269                    (ret->decision == DECISION_UNCOND_SUCC ||
1270                     ret->decision == DECISION_COND_SUCC)) {
1271                         wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication "
1272                                    "completed successfully (EAP workaround)");
1273                         data->phase2_success = 1;
1274         }
1275
1276         if (res == 1) {
1277                 return eap_tls_build_ack(&data->ssl, respDataLen, id,
1278                                          EAP_TYPE_TTLS, 0);
1279         }
1280         return resp;
1281 }
1282
1283
1284 static Boolean eap_ttls_has_reauth_data(struct eap_sm *sm, void *priv)
1285 {
1286         struct eap_ttls_data *data = priv;
1287         return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1288                 data->phase2_success;
1289 }
1290
1291
1292 static void eap_ttls_deinit_for_reauth(struct eap_sm *sm, void *priv)
1293 {
1294         struct eap_ttls_data *data = priv;
1295         free(data->pending_phase2_req);
1296         data->pending_phase2_req = NULL;
1297 }
1298
1299
1300 static void * eap_ttls_init_for_reauth(struct eap_sm *sm, void *priv)
1301 {
1302         struct eap_ttls_data *data = priv;
1303         free(data->key_data);
1304         data->key_data = NULL;
1305         if (eap_tls_reauth_init(sm, &data->ssl)) {
1306                 free(data);
1307                 return NULL;
1308         }
1309         data->phase2_start = 0;
1310         data->phase2_success = 0;
1311         data->resuming = 1;
1312         data->reauth = 1;
1313         return priv;
1314 }
1315
1316
1317 static int eap_ttls_get_status(struct eap_sm *sm, void *priv, char *buf,
1318                                size_t buflen, int verbose)
1319 {
1320         struct eap_ttls_data *data = priv;
1321         int len;
1322
1323         len = eap_tls_status(sm, &data->ssl, buf, buflen, verbose);
1324         switch (data->phase2_type) {
1325         case EAP_TTLS_PHASE2_EAP:
1326                 len += snprintf(buf + len, buflen - len,
1327                                 "EAP-TTLS Phase2 method=EAP-%s\n",
1328                                 data->phase2_method ? data->phase2_method->name
1329                                 : "?");
1330                 break;
1331         case EAP_TTLS_PHASE2_MSCHAPV2:
1332                 len += snprintf(buf + len, buflen - len,
1333                                 "EAP-TTLS Phase2 method=MSCHAPV2\n");
1334                 break;
1335         case EAP_TTLS_PHASE2_MSCHAP:
1336                 len += snprintf(buf + len, buflen - len,
1337                                 "EAP-TTLS Phase2 method=MSCHAP\n");
1338                 break;
1339         case EAP_TTLS_PHASE2_PAP:
1340                 len += snprintf(buf + len, buflen - len,
1341                                 "EAP-TTLS Phase2 method=PAP\n");
1342                 break;
1343         case EAP_TTLS_PHASE2_CHAP:
1344                 len += snprintf(buf + len, buflen - len,
1345                                 "EAP-TTLS Phase2 method=CHAP\n");
1346                 break;
1347         }
1348
1349         return len;
1350 }
1351
1352
1353 static Boolean eap_ttls_isKeyAvailable(struct eap_sm *sm, void *priv)
1354 {
1355         struct eap_ttls_data *data = priv;
1356         return data->key_data != NULL && data->phase2_success;
1357 }
1358
1359
1360 static u8 * eap_ttls_getKey(struct eap_sm *sm, void *priv, size_t *len)
1361 {
1362         struct eap_ttls_data *data = priv;
1363         u8 *key;
1364
1365         if (data->key_data == NULL || !data->phase2_success)
1366                 return NULL;
1367
1368         key = malloc(EAP_TLS_KEY_LEN);
1369         if (key == NULL)
1370                 return NULL;
1371
1372         *len = EAP_TLS_KEY_LEN;
1373         memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1374
1375         return key;
1376 }
1377
1378
1379 const struct eap_method eap_method_ttls =
1380 {
1381         .method = EAP_TYPE_TTLS,
1382         .name = "TTLS",
1383         .init = eap_ttls_init,
1384         .deinit = eap_ttls_deinit,
1385         .process = eap_ttls_process,
1386         .isKeyAvailable = eap_ttls_isKeyAvailable,
1387         .getKey = eap_ttls_getKey,
1388         .get_status = eap_ttls_get_status,
1389         .has_reauth_data = eap_ttls_has_reauth_data,
1390         .deinit_for_reauth = eap_ttls_deinit_for_reauth,
1391         .init_for_reauth = eap_ttls_init_for_reauth,
1392 };