contrib/wpa_supplicant-0.4.9/eapol_sm.c

   1 /*
   2  * WPA Supplicant / EAPOL state machines
   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 "eapol_sm.h"
  21 #include "eap.h"
  22 #include "eloop.h"
  23 #include "l2_packet.h"
  24 #include "wpa.h"
  25 #include "md5.h"
  26 #include "rc4.h"
  27
  28
  29 /* IEEE 802.1X-2004 - Supplicant - EAPOL state machines */
  30
  31 /**
  32  * struct eapol_sm - Internal data for EAPOL state machines
  33  */
  34 struct eapol_sm {
  35         /* Timers */
  36         unsigned int authWhile;
  37         unsigned int heldWhile;
  38         unsigned int startWhen;
  39         unsigned int idleWhile; /* for EAP state machine */
  40
  41         /* Global variables */
  42         Boolean eapFail;
  43         Boolean eapolEap;
  44         Boolean eapSuccess;
  45         Boolean initialize;
  46         Boolean keyDone;
  47         Boolean keyRun;
  48         PortControl portControl;
  49         Boolean portEnabled;
  50         PortStatus suppPortStatus;  /* dot1xSuppControlledPortStatus */
  51         Boolean portValid;
  52         Boolean suppAbort;
  53         Boolean suppFail;
  54         Boolean suppStart;
  55         Boolean suppSuccess;
  56         Boolean suppTimeout;
  57
  58         /* Supplicant PAE state machine */
  59         enum {
  60                 SUPP_PAE_UNKNOWN = 0,
  61                 SUPP_PAE_DISCONNECTED = 1,
  62                 SUPP_PAE_LOGOFF = 2,
  63                 SUPP_PAE_CONNECTING = 3,
  64                 SUPP_PAE_AUTHENTICATING = 4,
  65                 SUPP_PAE_AUTHENTICATED = 5,
  66                 /* unused(6) */
  67                 SUPP_PAE_HELD = 7,
  68                 SUPP_PAE_RESTART = 8,
  69                 SUPP_PAE_S_FORCE_AUTH = 9,
  70                 SUPP_PAE_S_FORCE_UNAUTH = 10
  71         } SUPP_PAE_state; /* dot1xSuppPaeState */
  72         /* Variables */
  73         Boolean userLogoff;
  74         Boolean logoffSent;
  75         unsigned int startCount;
  76         Boolean eapRestart;
  77         PortControl sPortMode;
  78         /* Constants */
  79         unsigned int heldPeriod; /* dot1xSuppHeldPeriod */
  80         unsigned int startPeriod; /* dot1xSuppStartPeriod */
  81         unsigned int maxStart; /* dot1xSuppMaxStart */
  82
  83         /* Key Receive state machine */
  84         enum {
  85                 KEY_RX_UNKNOWN = 0,
  86                 KEY_RX_NO_KEY_RECEIVE, KEY_RX_KEY_RECEIVE
  87         } KEY_RX_state;
  88         /* Variables */
  89         Boolean rxKey;
  90
  91         /* Supplicant Backend state machine */
  92         enum {
  93                 SUPP_BE_UNKNOWN = 0,
  94                 SUPP_BE_INITIALIZE = 1,
  95                 SUPP_BE_IDLE = 2,
  96                 SUPP_BE_REQUEST = 3,
  97                 SUPP_BE_RECEIVE = 4,
  98                 SUPP_BE_RESPONSE = 5,
  99                 SUPP_BE_FAIL = 6,
 100                 SUPP_BE_TIMEOUT = 7,
 101                 SUPP_BE_SUCCESS = 8
 102         } SUPP_BE_state; /* dot1xSuppBackendPaeState */
 103         /* Variables */
 104         Boolean eapNoResp;
 105         Boolean eapReq;
 106         Boolean eapResp;
 107         /* Constants */
 108         unsigned int authPeriod; /* dot1xSuppAuthPeriod */
 109
 110         /* Statistics */
 111         unsigned int dot1xSuppEapolFramesRx;
 112         unsigned int dot1xSuppEapolFramesTx;
 113         unsigned int dot1xSuppEapolStartFramesTx;
 114         unsigned int dot1xSuppEapolLogoffFramesTx;
 115         unsigned int dot1xSuppEapolRespFramesTx;
 116         unsigned int dot1xSuppEapolReqIdFramesRx;
 117         unsigned int dot1xSuppEapolReqFramesRx;
 118         unsigned int dot1xSuppInvalidEapolFramesRx;
 119         unsigned int dot1xSuppEapLengthErrorFramesRx;
 120         unsigned int dot1xSuppLastEapolFrameVersion;
 121         unsigned char dot1xSuppLastEapolFrameSource[6];
 122
 123         /* Miscellaneous variables (not defined in IEEE 802.1X-2004) */
 124         Boolean changed;
 125         struct eap_sm *eap;
 126         struct wpa_ssid *config;
 127         Boolean initial_req;
 128         u8 *last_rx_key;
 129         size_t last_rx_key_len;
 130         u8 *eapReqData; /* for EAP */
 131         size_t eapReqDataLen; /* for EAP */
 132         Boolean altAccept; /* for EAP */
 133         Boolean altReject; /* for EAP */
 134         Boolean replay_counter_valid;
 135         u8 last_replay_counter[16];
 136         struct eapol_config conf;
 137         struct eapol_ctx *ctx;
 138         enum { EAPOL_CB_IN_PROGRESS = 0, EAPOL_CB_SUCCESS, EAPOL_CB_FAILURE }
 139                 cb_status;
 140         Boolean cached_pmk;
 141
 142         Boolean unicast_key_received, broadcast_key_received;
 143 };
 144
 145
 146 #define IEEE8021X_REPLAY_COUNTER_LEN 8
 147 #define IEEE8021X_KEY_SIGN_LEN 16
 148 #define IEEE8021X_KEY_IV_LEN 16
 149
 150 #define IEEE8021X_KEY_INDEX_FLAG 0x80
 151 #define IEEE8021X_KEY_INDEX_MASK 0x03
 152
 153 struct ieee802_1x_eapol_key {
 154         u8 type;
 155         /* Note: key_length is unaligned */
 156         u8 key_length[2];
 157         /* does not repeat within the life of the keying material used to
 158          * encrypt the Key field; 64-bit NTP timestamp MAY be used here */
 159         u8 replay_counter[IEEE8021X_REPLAY_COUNTER_LEN];
 160         u8 key_iv[IEEE8021X_KEY_IV_LEN]; /* cryptographically random number */
 161         u8 key_index; /* key flag in the most significant bit:
 162                        * 0 = broadcast (default key),
 163                        * 1 = unicast (key mapping key); key index is in the
 164                        * 7 least significant bits */
 165         /* HMAC-MD5 message integrity check computed with MS-MPPE-Send-Key as
 166          * the key */
 167         u8 key_signature[IEEE8021X_KEY_SIGN_LEN];
 168
 169         /* followed by key: if packet body length = 44 + key length, then the
 170          * key field (of key_length bytes) contains the key in encrypted form;
 171          * if packet body length = 44, key field is absent and key_length
 172          * represents the number of least significant octets from
 173          * MS-MPPE-Send-Key attribute to be used as the keying material;
 174          * RC4 key used in encryption = Key-IV + MS-MPPE-Recv-Key */
 175 } __attribute__ ((packed));
 176
 177
 178 static void eapol_sm_txLogoff(struct eapol_sm *sm);
 179 static void eapol_sm_txStart(struct eapol_sm *sm);
 180 static void eapol_sm_processKey(struct eapol_sm *sm);
 181 static void eapol_sm_getSuppRsp(struct eapol_sm *sm);
 182 static void eapol_sm_txSuppRsp(struct eapol_sm *sm);
 183 static void eapol_sm_abortSupp(struct eapol_sm *sm);
 184 static void eapol_sm_abort_cached(struct eapol_sm *sm);
 185 static void eapol_sm_step_timeout(void *eloop_ctx, void *timeout_ctx);
 186
 187
 188 /* Definitions for clarifying state machine implementation */
 189 #define SM_STATE(machine, state) \
 190 static void sm_ ## machine ## _ ## state ## _Enter(struct eapol_sm *sm, \
 191         int global)
 192
 193 #define SM_ENTRY(machine, state) \
 194 if (!global || sm->machine ## _state != machine ## _ ## state) { \
 195         sm->changed = TRUE; \
 196         wpa_printf(MSG_DEBUG, "EAPOL: " #machine " entering state " #state); \
 197 } \
 198 sm->machine ## _state = machine ## _ ## state;
 199
 200 #define SM_ENTER(machine, state) \
 201 sm_ ## machine ## _ ## state ## _Enter(sm, 0)
 202 #define SM_ENTER_GLOBAL(machine, state) \
 203 sm_ ## machine ## _ ## state ## _Enter(sm, 1)
 204
 205 #define SM_STEP(machine) \
 206 static void sm_ ## machine ## _Step(struct eapol_sm *sm)
 207
 208 #define SM_STEP_RUN(machine) sm_ ## machine ## _Step(sm)
 209
 210
 211 /* Port Timers state machine - implemented as a function that will be called
 212  * once a second as a registered event loop timeout */
 213 static void eapol_port_timers_tick(void *eloop_ctx, void *timeout_ctx)
 214 {
 215         struct eapol_sm *sm = timeout_ctx;
 216
 217         if (sm->authWhile > 0) {
 218                 sm->authWhile--;
 219                 if (sm->authWhile == 0)
 220                         wpa_printf(MSG_DEBUG, "EAPOL: authWhile --> 0");
 221         }
 222         if (sm->heldWhile > 0) {
 223                 sm->heldWhile--;
 224                 if (sm->heldWhile == 0)
 225                         wpa_printf(MSG_DEBUG, "EAPOL: heldWhile --> 0");
 226         }
 227         if (sm->startWhen > 0) {
 228                 sm->startWhen--;
 229                 if (sm->startWhen == 0)
 230                         wpa_printf(MSG_DEBUG, "EAPOL: startWhen --> 0");
 231         }
 232         if (sm->idleWhile > 0) {
 233                 sm->idleWhile--;
 234                 if (sm->idleWhile == 0)
 235                         wpa_printf(MSG_DEBUG, "EAPOL: idleWhile --> 0");
 236         }
 237
 238         eloop_register_timeout(1, 0, eapol_port_timers_tick, eloop_ctx, sm);
 239         eapol_sm_step(sm);
 240 }
 241
 242
 243 SM_STATE(SUPP_PAE, LOGOFF)
 244 {
 245         SM_ENTRY(SUPP_PAE, LOGOFF);
 246         eapol_sm_txLogoff(sm);
 247         sm->logoffSent = TRUE;
 248         sm->suppPortStatus = Unauthorized;
 249 }
 250
 251
 252 SM_STATE(SUPP_PAE, DISCONNECTED)
 253 {
 254         SM_ENTRY(SUPP_PAE, DISCONNECTED);
 255         sm->sPortMode = Auto;
 256         sm->startCount = 0;
 257         sm->logoffSent = FALSE;
 258         sm->suppPortStatus = Unauthorized;
 259         sm->suppAbort = TRUE;
 260
 261         sm->unicast_key_received = FALSE;
 262         sm->broadcast_key_received = FALSE;
 263 }
 264
 265
 266 SM_STATE(SUPP_PAE, CONNECTING)
 267 {
 268         int send_start = sm->SUPP_PAE_state == SUPP_PAE_CONNECTING;
 269         SM_ENTRY(SUPP_PAE, CONNECTING);
 270         if (send_start) {
 271                 sm->startWhen = sm->startPeriod;
 272                 sm->startCount++;
 273         } else {
 274                 /*
 275                  * Do not send EAPOL-Start immediately since in most cases,
 276                  * Authenticator is going to start authentication immediately
 277                  * after association and an extra EAPOL-Start is just going to
 278                  * delay authentication. Use a short timeout to send the first
 279                  * EAPOL-Start if Authenticator does not start authentication.
 280                  */
 281                 sm->startWhen = 3;
 282         }
 283         sm->eapolEap = FALSE;
 284         if (send_start)
 285                 eapol_sm_txStart(sm);
 286 }
 287
 288
 289 SM_STATE(SUPP_PAE, AUTHENTICATING)
 290 {
 291         SM_ENTRY(SUPP_PAE, AUTHENTICATING);
 292         sm->startCount = 0;
 293         sm->suppSuccess = FALSE;
 294         sm->suppFail = FALSE;
 295         sm->suppTimeout = FALSE;
 296         sm->keyRun = FALSE;
 297         sm->keyDone = FALSE;
 298         sm->suppStart = TRUE;
 299 }
 300
 301
 302 SM_STATE(SUPP_PAE, HELD)
 303 {
 304         SM_ENTRY(SUPP_PAE, HELD);
 305         sm->heldWhile = sm->heldPeriod;
 306         sm->suppPortStatus = Unauthorized;
 307         sm->cb_status = EAPOL_CB_FAILURE;
 308 }
 309
 310
 311 SM_STATE(SUPP_PAE, AUTHENTICATED)
 312 {
 313         SM_ENTRY(SUPP_PAE, AUTHENTICATED);
 314         sm->suppPortStatus = Authorized;
 315         sm->cb_status = EAPOL_CB_SUCCESS;
 316 }
 317
 318
 319 SM_STATE(SUPP_PAE, RESTART)
 320 {
 321         SM_ENTRY(SUPP_PAE, RESTART);
 322         sm->eapRestart = TRUE;
 323 }
 324
 325
 326 SM_STATE(SUPP_PAE, S_FORCE_AUTH)
 327 {
 328         SM_ENTRY(SUPP_PAE, S_FORCE_AUTH);
 329         sm->suppPortStatus = Authorized;
 330         sm->sPortMode = ForceAuthorized;
 331 }
 332
 333
 334 SM_STATE(SUPP_PAE, S_FORCE_UNAUTH)
 335 {
 336         SM_ENTRY(SUPP_PAE, S_FORCE_UNAUTH);
 337         sm->suppPortStatus = Unauthorized;
 338         sm->sPortMode = ForceUnauthorized;
 339         eapol_sm_txLogoff(sm);
 340 }
 341
 342
 343 SM_STEP(SUPP_PAE)
 344 {
 345         if ((sm->userLogoff && !sm->logoffSent) &&
 346             !(sm->initialize || !sm->portEnabled))
 347                 SM_ENTER_GLOBAL(SUPP_PAE, LOGOFF);
 348         else if (((sm->portControl == Auto) &&
 349                   (sm->sPortMode != sm->portControl)) ||
 350                  sm->initialize || !sm->portEnabled)
 351                 SM_ENTER_GLOBAL(SUPP_PAE, DISCONNECTED);
 352         else if ((sm->portControl == ForceAuthorized) &&
 353                  (sm->sPortMode != sm->portControl) &&
 354                  !(sm->initialize || !sm->portEnabled))
 355                 SM_ENTER_GLOBAL(SUPP_PAE, S_FORCE_AUTH);
 356         else if ((sm->portControl == ForceUnauthorized) &&
 357                  (sm->sPortMode != sm->portControl) &&
 358                  !(sm->initialize || !sm->portEnabled))
 359                 SM_ENTER_GLOBAL(SUPP_PAE, S_FORCE_UNAUTH);
 360         else switch (sm->SUPP_PAE_state) {
 361         case SUPP_PAE_UNKNOWN:
 362                 break;
 363         case SUPP_PAE_LOGOFF:
 364                 if (!sm->userLogoff)
 365                         SM_ENTER(SUPP_PAE, DISCONNECTED);
 366                 break;
 367         case SUPP_PAE_DISCONNECTED:
 368                 SM_ENTER(SUPP_PAE, CONNECTING);
 369                 break;
 370         case SUPP_PAE_CONNECTING:
 371                 if (sm->startWhen == 0 && sm->startCount < sm->maxStart)
 372                         SM_ENTER(SUPP_PAE, CONNECTING);
 373                 else if (sm->startWhen == 0 &&
 374                          sm->startCount >= sm->maxStart &&
 375                          sm->portValid)
 376                         SM_ENTER(SUPP_PAE, AUTHENTICATED);
 377                 else if (sm->eapSuccess || sm->eapFail)
 378                         SM_ENTER(SUPP_PAE, AUTHENTICATING);
 379                 else if (sm->eapolEap)
 380                         SM_ENTER(SUPP_PAE, RESTART);
 381                 else if (sm->startWhen == 0 &&
 382                          sm->startCount >= sm->maxStart &&
 383                          !sm->portValid)
 384                         SM_ENTER(SUPP_PAE, HELD);
 385                 break;
 386         case SUPP_PAE_AUTHENTICATING:
 387                 if (sm->eapSuccess && !sm->portValid &&
 388                     sm->conf.accept_802_1x_keys &&
 389                     sm->conf.required_keys == 0) {
 390                         wpa_printf(MSG_DEBUG, "EAPOL: IEEE 802.1X for "
 391                                    "plaintext connection; no EAPOL-Key frames "
 392                                    "required");
 393                         sm->portValid = TRUE;
 394                         if (sm->ctx->eapol_done_cb)
 395                                 sm->ctx->eapol_done_cb(sm->ctx->ctx);
 396                 }
 397                 if (sm->eapSuccess && sm->portValid)
 398                         SM_ENTER(SUPP_PAE, AUTHENTICATED);
 399                 else if (sm->eapFail || (sm->keyDone && !sm->portValid))
 400                         SM_ENTER(SUPP_PAE, HELD);
 401                 else if (sm->suppTimeout)
 402                         SM_ENTER(SUPP_PAE, CONNECTING);
 403                 break;
 404         case SUPP_PAE_HELD:
 405                 if (sm->heldWhile == 0)
 406                         SM_ENTER(SUPP_PAE, CONNECTING);
 407                 else if (sm->eapolEap)
 408                         SM_ENTER(SUPP_PAE, RESTART);
 409                 break;
 410         case SUPP_PAE_AUTHENTICATED:
 411                 if (sm->eapolEap && sm->portValid)
 412                         SM_ENTER(SUPP_PAE, RESTART);
 413                 else if (!sm->portValid)
 414                         SM_ENTER(SUPP_PAE, DISCONNECTED);
 415                 break;
 416         case SUPP_PAE_RESTART:
 417                 if (!sm->eapRestart)
 418                         SM_ENTER(SUPP_PAE, AUTHENTICATING);
 419                 break;
 420         case SUPP_PAE_S_FORCE_AUTH:
 421                 break;
 422         case SUPP_PAE_S_FORCE_UNAUTH:
 423                 break;
 424         }
 425 }
 426
 427
 428 SM_STATE(KEY_RX, NO_KEY_RECEIVE)
 429 {
 430         SM_ENTRY(KEY_RX, NO_KEY_RECEIVE);
 431 }
 432
 433
 434 SM_STATE(KEY_RX, KEY_RECEIVE)
 435 {
 436         SM_ENTRY(KEY_RX, KEY_RECEIVE);
 437         eapol_sm_processKey(sm);
 438         sm->rxKey = FALSE;
 439 }
 440
 441
 442 SM_STEP(KEY_RX)
 443 {
 444         if (sm->initialize || !sm->portEnabled)
 445                 SM_ENTER_GLOBAL(KEY_RX, NO_KEY_RECEIVE);
 446         switch (sm->KEY_RX_state) {
 447         case KEY_RX_UNKNOWN:
 448                 break;
 449         case KEY_RX_NO_KEY_RECEIVE:
 450                 if (sm->rxKey)
 451                         SM_ENTER(KEY_RX, KEY_RECEIVE);
 452                 break;
 453         case KEY_RX_KEY_RECEIVE:
 454                 if (sm->rxKey)
 455                         SM_ENTER(KEY_RX, KEY_RECEIVE);
 456                 break;
 457         }
 458 }
 459
 460
 461 SM_STATE(SUPP_BE, REQUEST)
 462 {
 463         SM_ENTRY(SUPP_BE, REQUEST);
 464         sm->authWhile = 0;
 465         sm->eapReq = TRUE;
 466         eapol_sm_getSuppRsp(sm);
 467 }
 468
 469
 470 SM_STATE(SUPP_BE, RESPONSE)
 471 {
 472         SM_ENTRY(SUPP_BE, RESPONSE);
 473         eapol_sm_txSuppRsp(sm);
 474         sm->eapResp = FALSE;
 475 }
 476
 477
 478 SM_STATE(SUPP_BE, SUCCESS)
 479 {
 480         SM_ENTRY(SUPP_BE, SUCCESS);
 481         sm->keyRun = TRUE;
 482         sm->suppSuccess = TRUE;
 483
 484         if (eap_key_available(sm->eap)) {
 485                 /* New key received - clear IEEE 802.1X EAPOL-Key replay
 486                  * counter */
 487                 sm->replay_counter_valid = FALSE;
 488         }
 489 }
 490
 491
 492 SM_STATE(SUPP_BE, FAIL)
 493 {
 494         SM_ENTRY(SUPP_BE, FAIL);
 495         sm->suppFail = TRUE;
 496 }
 497
 498
 499 SM_STATE(SUPP_BE, TIMEOUT)
 500 {
 501         SM_ENTRY(SUPP_BE, TIMEOUT);
 502         sm->suppTimeout = TRUE;
 503 }
 504
 505
 506 SM_STATE(SUPP_BE, IDLE)
 507 {
 508         SM_ENTRY(SUPP_BE, IDLE);
 509         sm->suppStart = FALSE;
 510         sm->initial_req = TRUE;
 511 }
 512
 513
 514 SM_STATE(SUPP_BE, INITIALIZE)
 515 {
 516         SM_ENTRY(SUPP_BE, INITIALIZE);
 517         eapol_sm_abortSupp(sm);
 518         sm->suppAbort = FALSE;
 519 }
 520
 521
 522 SM_STATE(SUPP_BE, RECEIVE)
 523 {
 524         SM_ENTRY(SUPP_BE, RECEIVE);
 525         sm->authWhile = sm->authPeriod;
 526         sm->eapolEap = FALSE;
 527         sm->eapNoResp = FALSE;
 528         sm->initial_req = FALSE;
 529 }
 530
 531
 532 SM_STEP(SUPP_BE)
 533 {
 534         if (sm->initialize || sm->suppAbort)
 535                 SM_ENTER_GLOBAL(SUPP_BE, INITIALIZE);
 536         else switch (sm->SUPP_BE_state) {
 537         case SUPP_BE_UNKNOWN:
 538                 break;
 539         case SUPP_BE_REQUEST:
 540                 if (sm->eapResp && sm->eapNoResp) {
 541                         wpa_printf(MSG_DEBUG, "EAPOL: SUPP_BE REQUEST: both "
 542                                    "eapResp and eapNoResp set?!");
 543                 }
 544                 if (sm->eapResp)
 545                         SM_ENTER(SUPP_BE, RESPONSE);
 546                 else if (sm->eapNoResp)
 547                         SM_ENTER(SUPP_BE, RECEIVE);
 548                 break;
 549         case SUPP_BE_RESPONSE:
 550                 SM_ENTER(SUPP_BE, RECEIVE);
 551                 break;
 552         case SUPP_BE_SUCCESS:
 553                 SM_ENTER(SUPP_BE, IDLE);
 554                 break;
 555         case SUPP_BE_FAIL:
 556                 SM_ENTER(SUPP_BE, IDLE);
 557                 break;
 558         case SUPP_BE_TIMEOUT:
 559                 SM_ENTER(SUPP_BE, IDLE);
 560                 break;
 561         case SUPP_BE_IDLE:
 562                 if (sm->eapFail && sm->suppStart)
 563                         SM_ENTER(SUPP_BE, FAIL);
 564                 else if (sm->eapolEap && sm->suppStart)
 565                         SM_ENTER(SUPP_BE, REQUEST);
 566                 else if (sm->eapSuccess && sm->suppStart)
 567                         SM_ENTER(SUPP_BE, SUCCESS);
 568                 break;
 569         case SUPP_BE_INITIALIZE:
 570                 SM_ENTER(SUPP_BE, IDLE);
 571                 break;
 572         case SUPP_BE_RECEIVE:
 573                 if (sm->eapolEap)
 574                         SM_ENTER(SUPP_BE, REQUEST);
 575                 else if (sm->eapFail)
 576                         SM_ENTER(SUPP_BE, FAIL);
 577                 else if (sm->authWhile == 0)
 578                         SM_ENTER(SUPP_BE, TIMEOUT);
 579                 else if (sm->eapSuccess)
 580                         SM_ENTER(SUPP_BE, SUCCESS);
 581                 break;
 582         }
 583 }
 584
 585
 586 static void eapol_sm_txLogoff(struct eapol_sm *sm)
 587 {
 588         wpa_printf(MSG_DEBUG, "EAPOL: txLogoff");
 589         sm->ctx->eapol_send(sm->ctx->eapol_send_ctx,
 590                             IEEE802_1X_TYPE_EAPOL_LOGOFF, (u8 *) "", 0);
 591         sm->dot1xSuppEapolLogoffFramesTx++;
 592         sm->dot1xSuppEapolFramesTx++;
 593 }
 594
 595
 596 static void eapol_sm_txStart(struct eapol_sm *sm)
 597 {
 598         wpa_printf(MSG_DEBUG, "EAPOL: txStart");
 599         sm->ctx->eapol_send(sm->ctx->eapol_send_ctx,
 600                             IEEE802_1X_TYPE_EAPOL_START, (u8 *) "", 0);
 601         sm->dot1xSuppEapolStartFramesTx++;
 602         sm->dot1xSuppEapolFramesTx++;
 603 }
 604
 605
 606 #define IEEE8021X_ENCR_KEY_LEN 32
 607 #define IEEE8021X_SIGN_KEY_LEN 32
 608
 609 struct eap_key_data {
 610         u8 encr_key[IEEE8021X_ENCR_KEY_LEN];
 611         u8 sign_key[IEEE8021X_SIGN_KEY_LEN];
 612 };
 613
 614
 615 static void eapol_sm_processKey(struct eapol_sm *sm)
 616 {
 617         struct ieee802_1x_hdr *hdr;
 618         struct ieee802_1x_eapol_key *key;
 619         struct eap_key_data keydata;
 620         u8 orig_key_sign[IEEE8021X_KEY_SIGN_LEN], datakey[32];
 621         u8 ekey[IEEE8021X_KEY_IV_LEN + IEEE8021X_ENCR_KEY_LEN];
 622         int key_len, res, sign_key_len, encr_key_len;
 623         u16 rx_key_length;
 624
 625         wpa_printf(MSG_DEBUG, "EAPOL: processKey");
 626         if (sm->last_rx_key == NULL)
 627                 return;
 628
 629         if (!sm->conf.accept_802_1x_keys) {
 630                 wpa_printf(MSG_WARNING, "EAPOL: Received IEEE 802.1X EAPOL-Key"
 631                            " even though this was not accepted - "
 632                            "ignoring this packet");
 633                 return;
 634         }
 635
 636         hdr = (struct ieee802_1x_hdr *) sm->last_rx_key;
 637         key = (struct ieee802_1x_eapol_key *) (hdr + 1);
 638         if (sizeof(*hdr) + be_to_host16(hdr->length) > sm->last_rx_key_len) {
 639                 wpa_printf(MSG_WARNING, "EAPOL: Too short EAPOL-Key frame");
 640                 return;
 641         }
 642         rx_key_length = WPA_GET_BE16(key->key_length);
 643         wpa_printf(MSG_DEBUG, "EAPOL: RX IEEE 802.1X ver=%d type=%d len=%d "
 644                    "EAPOL-Key: type=%d key_length=%d key_index=0x%x",
 645                    hdr->version, hdr->type, be_to_host16(hdr->length),
 646                    key->type, rx_key_length, key->key_index);
 647
 648         eapol_sm_notify_lower_layer_success(sm);
 649         sign_key_len = IEEE8021X_SIGN_KEY_LEN;
 650         encr_key_len = IEEE8021X_ENCR_KEY_LEN;
 651         res = eapol_sm_get_key(sm, (u8 *) &keydata, sizeof(keydata));
 652         if (res < 0) {
 653                 wpa_printf(MSG_DEBUG, "EAPOL: Could not get master key for "
 654                            "decrypting EAPOL-Key keys");
 655                 return;
 656         }
 657         if (res == 16) {
 658                 /* LEAP derives only 16 bytes of keying material. */
 659                 res = eapol_sm_get_key(sm, (u8 *) &keydata, 16);
 660                 if (res) {
 661                         wpa_printf(MSG_DEBUG, "EAPOL: Could not get LEAP "
 662                                    "master key for decrypting EAPOL-Key keys");
 663                         return;
 664                 }
 665                 sign_key_len = 16;
 666                 encr_key_len = 16;
 667                 memcpy(keydata.sign_key, keydata.encr_key, 16);
 668         } else if (res) {
 669                 wpa_printf(MSG_DEBUG, "EAPOL: Could not get enough master key "
 670                            "data for decrypting EAPOL-Key keys (res=%d)", res);
 671                 return;
 672         }
 673
 674         /* The key replay_counter must increase when same master key */
 675         if (sm->replay_counter_valid &&
 676             memcmp(sm->last_replay_counter, key->replay_counter,
 677                    IEEE8021X_REPLAY_COUNTER_LEN) >= 0) {
 678                 wpa_printf(MSG_WARNING, "EAPOL: EAPOL-Key replay counter did "
 679                            "not increase - ignoring key");
 680                 wpa_hexdump(MSG_DEBUG, "EAPOL: last replay counter",
 681                             sm->last_replay_counter,
 682                             IEEE8021X_REPLAY_COUNTER_LEN);
 683                 wpa_hexdump(MSG_DEBUG, "EAPOL: received replay counter",
 684                             key->replay_counter, IEEE8021X_REPLAY_COUNTER_LEN);
 685                 return;
 686         }
 687
 688         /* Verify key signature (HMAC-MD5) */
 689         memcpy(orig_key_sign, key->key_signature, IEEE8021X_KEY_SIGN_LEN);
 690         memset(key->key_signature, 0, IEEE8021X_KEY_SIGN_LEN);
 691         hmac_md5(keydata.sign_key, sign_key_len,
 692                  sm->last_rx_key, sizeof(*hdr) + be_to_host16(hdr->length),
 693                  key->key_signature);
 694         if (memcmp(orig_key_sign, key->key_signature, IEEE8021X_KEY_SIGN_LEN)
 695             != 0) {
 696                 wpa_printf(MSG_DEBUG, "EAPOL: Invalid key signature in "
 697                            "EAPOL-Key packet");
 698                 memcpy(key->key_signature, orig_key_sign,
 699                        IEEE8021X_KEY_SIGN_LEN);
 700                 return;
 701         }
 702         wpa_printf(MSG_DEBUG, "EAPOL: EAPOL-Key key signature verified");
 703
 704         key_len = be_to_host16(hdr->length) - sizeof(*key);
 705         if (key_len > 32 || rx_key_length > 32) {
 706                 wpa_printf(MSG_WARNING, "EAPOL: Too long key data length %d",
 707                            key_len ? key_len : rx_key_length);
 708                 return;
 709         }
 710         if (key_len == rx_key_length) {
 711                 memcpy(ekey, key->key_iv, IEEE8021X_KEY_IV_LEN);
 712                 memcpy(ekey + IEEE8021X_KEY_IV_LEN, keydata.encr_key,
 713                        encr_key_len);
 714                 memcpy(datakey, key + 1, key_len);
 715                 rc4(datakey, key_len, ekey,
 716                     IEEE8021X_KEY_IV_LEN + encr_key_len);
 717                 wpa_hexdump_key(MSG_DEBUG, "EAPOL: Decrypted(RC4) key",
 718                                 datakey, key_len);
 719         } else if (key_len == 0) {
 720                 /*
 721                  * IEEE 802.1X-2004 specifies that least significant Key Length
 722                  * octets from MS-MPPE-Send-Key are used as the key if the key
 723                  * data is not present. This seems to be meaning the beginning
 724                  * of the MS-MPPE-Send-Key. In addition, MS-MPPE-Send-Key in
 725                  * Supplicant corresponds to MS-MPPE-Recv-Key in Authenticator.
 726                  * Anyway, taking the beginning of the keying material from EAP
 727                  * seems to interoperate with Authenticators.
 728                  */
 729                 key_len = rx_key_length;
 730                 memcpy(datakey, keydata.encr_key, key_len);
 731                 wpa_hexdump_key(MSG_DEBUG, "EAPOL: using part of EAP keying "
 732                                 "material data encryption key",
 733                                 datakey, key_len);
 734         } else {
 735                 wpa_printf(MSG_DEBUG, "EAPOL: Invalid key data length %d "
 736                            "(key_length=%d)", key_len, rx_key_length);
 737                 return;
 738         }
 739
 740         sm->replay_counter_valid = TRUE;
 741         memcpy(sm->last_replay_counter, key->replay_counter,
 742                IEEE8021X_REPLAY_COUNTER_LEN);
 743
 744         wpa_printf(MSG_DEBUG, "EAPOL: Setting dynamic WEP key: %s keyidx %d "
 745                    "len %d",
 746                    key->key_index & IEEE8021X_KEY_INDEX_FLAG ?
 747                    "unicast" : "broadcast",
 748                    key->key_index & IEEE8021X_KEY_INDEX_MASK, key_len);
 749
 750         if (sm->ctx->set_wep_key &&
 751             sm->ctx->set_wep_key(sm->ctx->ctx,
 752                                  key->key_index & IEEE8021X_KEY_INDEX_FLAG,
 753                                  key->key_index & IEEE8021X_KEY_INDEX_MASK,
 754                                  datakey, key_len) < 0) {
 755                 wpa_printf(MSG_WARNING, "EAPOL: Failed to set WEP key to the "
 756                            " driver.");
 757         } else {
 758                 if (key->key_index & IEEE8021X_KEY_INDEX_FLAG)
 759                         sm->unicast_key_received = TRUE;
 760                 else
 761                         sm->broadcast_key_received = TRUE;
 762
 763                 if ((sm->unicast_key_received ||
 764                      !(sm->conf.required_keys & EAPOL_REQUIRE_KEY_UNICAST)) &&
 765                     (sm->broadcast_key_received ||
 766                      !(sm->conf.required_keys & EAPOL_REQUIRE_KEY_BROADCAST)))
 767                 {
 768                         wpa_printf(MSG_DEBUG, "EAPOL: all required EAPOL-Key "
 769                                    "frames received");
 770                         sm->portValid = TRUE;
 771                         if (sm->ctx->eapol_done_cb)
 772                                 sm->ctx->eapol_done_cb(sm->ctx->ctx);
 773                 }
 774         }
 775 }
 776
 777
 778 static void eapol_sm_getSuppRsp(struct eapol_sm *sm)
 779 {
 780         wpa_printf(MSG_DEBUG, "EAPOL: getSuppRsp");
 781         /* EAP layer processing; no special code is needed, since Supplicant
 782          * Backend state machine is waiting for eapNoResp or eapResp to be set
 783          * and these are only set in the EAP state machine when the processing
 784          * has finished. */
 785 }
 786
 787
 788 static void eapol_sm_txSuppRsp(struct eapol_sm *sm)
 789 {
 790         u8 *resp;
 791         size_t resp_len;
 792
 793         wpa_printf(MSG_DEBUG, "EAPOL: txSuppRsp");
 794         resp = eap_get_eapRespData(sm->eap, &resp_len);
 795         if (resp == NULL) {
 796                 wpa_printf(MSG_WARNING, "EAPOL: txSuppRsp - EAP response data "
 797                            "not available");
 798                 return;
 799         }
 800
 801         /* Send EAP-Packet from the EAP layer to the Authenticator */
 802         sm->ctx->eapol_send(sm->ctx->eapol_send_ctx,
 803                             IEEE802_1X_TYPE_EAP_PACKET, resp, resp_len);
 804
 805         /* eapRespData is not used anymore, so free it here */
 806         free(resp);
 807
 808         if (sm->initial_req)
 809                 sm->dot1xSuppEapolReqIdFramesRx++;
 810         else
 811                 sm->dot1xSuppEapolReqFramesRx++;
 812         sm->dot1xSuppEapolRespFramesTx++;
 813         sm->dot1xSuppEapolFramesTx++;
 814 }
 815
 816
 817 static void eapol_sm_abortSupp(struct eapol_sm *sm)
 818 {
 819         /* release system resources that may have been allocated for the
 820          * authentication session */
 821         free(sm->last_rx_key);
 822         sm->last_rx_key = NULL;
 823         free(sm->eapReqData);
 824         sm->eapReqData = NULL;
 825         eap_sm_abort(sm->eap);
 826 }
 827
 828
 829 static void eapol_sm_step_timeout(void *eloop_ctx, void *timeout_ctx)
 830 {
 831         eapol_sm_step(timeout_ctx);
 832 }
 833
 834
 835 /**
 836  * eapol_sm_step - EAPOL state machine step function
 837  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
 838  *
 839  * This function is called to notify the state machine about changed external
 840  * variables. It will step through the EAPOL state machines in loop to process
 841  * all triggered state changes.
 842  */
 843 void eapol_sm_step(struct eapol_sm *sm)
 844 {
 845         int i;
 846
 847         /* In theory, it should be ok to run this in loop until !changed.
 848          * However, it is better to use a limit on number of iterations to
 849          * allow events (e.g., SIGTERM) to stop the program cleanly if the
 850          * state machine were to generate a busy loop. */
 851         for (i = 0; i < 100; i++) {
 852                 sm->changed = FALSE;
 853                 SM_STEP_RUN(SUPP_PAE);
 854                 SM_STEP_RUN(KEY_RX);
 855                 SM_STEP_RUN(SUPP_BE);
 856                 if (eap_sm_step(sm->eap))
 857                         sm->changed = TRUE;
 858         }
 859
 860         if (sm->changed) {
 861                 /* restart EAPOL state machine step from timeout call in order
 862                  * to allow other events to be processed. */
 863                 eloop_cancel_timeout(eapol_sm_step_timeout, NULL, sm);
 864                 eloop_register_timeout(0, 0, eapol_sm_step_timeout, NULL, sm);
 865         }
 866
 867         if (sm->ctx->cb && sm->cb_status != EAPOL_CB_IN_PROGRESS) {
 868                 int success = sm->cb_status == EAPOL_CB_SUCCESS ? 1 : 0;
 869                 sm->cb_status = EAPOL_CB_IN_PROGRESS;
 870                 sm->ctx->cb(sm, success, sm->ctx->cb_ctx);
 871         }
 872 }
 873
 874
 875 static const char *eapol_supp_pae_state(int state)
 876 {
 877         switch (state) {
 878         case SUPP_PAE_LOGOFF:
 879                 return "LOGOFF";
 880         case SUPP_PAE_DISCONNECTED:
 881                 return "DISCONNECTED";
 882         case SUPP_PAE_CONNECTING:
 883                 return "CONNECTING";
 884         case SUPP_PAE_AUTHENTICATING:
 885                 return "AUTHENTICATING";
 886         case SUPP_PAE_HELD:
 887                 return "HELD";
 888         case SUPP_PAE_AUTHENTICATED:
 889                 return "AUTHENTICATED";
 890         case SUPP_PAE_RESTART:
 891                 return "RESTART";
 892         default:
 893                 return "UNKNOWN";
 894         }
 895 }
 896
 897
 898 static const char *eapol_supp_be_state(int state)
 899 {
 900         switch (state) {
 901         case SUPP_BE_REQUEST:
 902                 return "REQUEST";
 903         case SUPP_BE_RESPONSE:
 904                 return "RESPONSE";
 905         case SUPP_BE_SUCCESS:
 906                 return "SUCCESS";
 907         case SUPP_BE_FAIL:
 908                 return "FAIL";
 909         case SUPP_BE_TIMEOUT:
 910                 return "TIMEOUT";
 911         case SUPP_BE_IDLE:
 912                 return "IDLE";
 913         case SUPP_BE_INITIALIZE:
 914                 return "INITIALIZE";
 915         case SUPP_BE_RECEIVE:
 916                 return "RECEIVE";
 917         default:
 918                 return "UNKNOWN";
 919         }
 920 }
 921
 922
 923 static const char * eapol_port_status(PortStatus status)
 924 {
 925         if (status == Authorized)
 926                 return "Authorized";
 927         else
 928                 return "Unauthorized";
 929 }
 930
 931
 932 static const char * eapol_port_control(PortControl ctrl)
 933 {
 934         switch (ctrl) {
 935         case Auto:
 936                 return "Auto";
 937         case ForceUnauthorized:
 938                 return "ForceUnauthorized";
 939         case ForceAuthorized:
 940                 return "ForceAuthorized";
 941         default:
 942                 return "Unknown";
 943         }
 944 }
 945
 946
 947 /**
 948  * eapol_sm_configure - Set EAPOL variables
 949  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
 950  * @heldPeriod: dot1xSuppHeldPeriod
 951  * @authPeriod: dot1xSuppAuthPeriod
 952  * @startPeriod: dot1xSuppStartPeriod
 953  * @maxStart: dot1xSuppMaxStart
 954  *
 955  * Set configurable EAPOL state machine variables. Each variable can be set to
 956  * the given value or ignored if set to -1 (to set only some of the variables).
 957  */
 958 void eapol_sm_configure(struct eapol_sm *sm, int heldPeriod, int authPeriod,
 959                         int startPeriod, int maxStart)
 960 {
 961         if (sm == NULL)
 962                 return;
 963         if (heldPeriod >= 0)
 964                 sm->heldPeriod = heldPeriod;
 965         if (authPeriod >= 0)
 966                 sm->authPeriod = authPeriod;
 967         if (startPeriod >= 0)
 968                 sm->startPeriod = startPeriod;
 969         if (maxStart >= 0)
 970                 sm->maxStart = maxStart;
 971 }
 972
 973
 974 /**
 975  * eapol_sm_get_status - Get EAPOL state machine status
 976  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
 977  * @buf: Buffer for status information
 978  * @buflen: Maximum buffer length
 979  * @verbose: Whether to include verbose status information
 980  * Returns: Number of bytes written to buf.
 981  *
 982  * Query EAPOL state machine for status information. This function fills in a
 983  * text area with current status information from the EAPOL state machine. If
 984  * the buffer (buf) is not large enough, status information will be truncated
 985  * to fit the buffer.
 986  */
 987 int eapol_sm_get_status(struct eapol_sm *sm, char *buf, size_t buflen,
 988                         int verbose)
 989 {
 990         int len;
 991         if (sm == NULL)
 992                 return 0;
 993
 994         len = snprintf(buf, buflen,
 995                        "Supplicant PAE state=%s\n"
 996                        "suppPortStatus=%s\n",
 997                        eapol_supp_pae_state(sm->SUPP_PAE_state),
 998                        eapol_port_status(sm->suppPortStatus));
 999
1000         if (verbose) {
1001                 len += snprintf(buf + len, buflen - len,
1002                                 "heldPeriod=%u\n"
1003                                 "authPeriod=%u\n"
1004                                 "startPeriod=%u\n"
1005                                 "maxStart=%u\n"
1006                                 "portControl=%s\n"
1007                                 "Supplicant Backend state=%s\n",
1008                                 sm->heldPeriod,
1009                                 sm->authPeriod,
1010                                 sm->startPeriod,
1011                                 sm->maxStart,
1012                                 eapol_port_control(sm->portControl),
1013                                 eapol_supp_be_state(sm->SUPP_BE_state));
1014         }
1015
1016         len += eap_sm_get_status(sm->eap, buf + len, buflen - len, verbose);
1017
1018         return len;
1019 }
1020
1021
1022 /**
1023  * eapol_sm_get_mib - Get EAPOL state machine MIBs
1024  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
1025  * @buf: Buffer for MIB information
1026  * @buflen: Maximum buffer length
1027  * Returns: Number of bytes written to buf.
1028  *
1029  * Query EAPOL state machine for MIB information. This function fills in a
1030  * text area with current MIB information from the EAPOL state machine. If
1031  * the buffer (buf) is not large enough, MIB information will be truncated to
1032  * fit the buffer.
1033  */
1034 int eapol_sm_get_mib(struct eapol_sm *sm, char *buf, size_t buflen)
1035 {
1036         int len;
1037         if (sm == NULL)
1038                 return 0;
1039         len = snprintf(buf, buflen,
1040                        "dot1xSuppPaeState=%d\n"
1041                        "dot1xSuppHeldPeriod=%u\n"
1042                        "dot1xSuppAuthPeriod=%u\n"
1043                        "dot1xSuppStartPeriod=%u\n"
1044                        "dot1xSuppMaxStart=%u\n"
1045                        "dot1xSuppSuppControlledPortStatus=%s\n"
1046                        "dot1xSuppBackendPaeState=%d\n"
1047                        "dot1xSuppEapolFramesRx=%u\n"
1048                        "dot1xSuppEapolFramesTx=%u\n"
1049                        "dot1xSuppEapolStartFramesTx=%u\n"
1050                        "dot1xSuppEapolLogoffFramesTx=%u\n"
1051                        "dot1xSuppEapolRespFramesTx=%u\n"
1052                        "dot1xSuppEapolReqIdFramesRx=%u\n"
1053                        "dot1xSuppEapolReqFramesRx=%u\n"
1054                        "dot1xSuppInvalidEapolFramesRx=%u\n"
1055                        "dot1xSuppEapLengthErrorFramesRx=%u\n"
1056                        "dot1xSuppLastEapolFrameVersion=%u\n"
1057                        "dot1xSuppLastEapolFrameSource=" MACSTR "\n",
1058                        sm->SUPP_PAE_state,
1059                        sm->heldPeriod,
1060                        sm->authPeriod,
1061                        sm->startPeriod,
1062                        sm->maxStart,
1063                        sm->suppPortStatus == Authorized ?
1064                        "Authorized" : "Unauthorized",
1065                        sm->SUPP_BE_state,
1066                        sm->dot1xSuppEapolFramesRx,
1067                        sm->dot1xSuppEapolFramesTx,
1068                        sm->dot1xSuppEapolStartFramesTx,
1069                        sm->dot1xSuppEapolLogoffFramesTx,
1070                        sm->dot1xSuppEapolRespFramesTx,
1071                        sm->dot1xSuppEapolReqIdFramesRx,
1072                        sm->dot1xSuppEapolReqFramesRx,
1073                        sm->dot1xSuppInvalidEapolFramesRx,
1074                        sm->dot1xSuppEapLengthErrorFramesRx,
1075                        sm->dot1xSuppLastEapolFrameVersion,
1076                        MAC2STR(sm->dot1xSuppLastEapolFrameSource));
1077         return len;
1078 }
1079
1080
1081 /**
1082  * eapol_sm_rx_eapol - Process received EAPOL frames
1083  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
1084  * @src: Source MAC address of the EAPOL packet
1085  * @buf: Pointer to the beginning of the EAPOL data (EAPOL header)
1086  * @len: Length of the EAPOL frame
1087  * Returns: 1 = EAPOL frame processed, 0 = not for EAPOL state machine,
1088  * -1 failure
1089  */
1090 int eapol_sm_rx_eapol(struct eapol_sm *sm, const u8 *src, const u8 *buf,
1091                       size_t len)
1092 {
1093         const struct ieee802_1x_hdr *hdr;
1094         const struct ieee802_1x_eapol_key *key;
1095         int plen, data_len;
1096         int res = 1;
1097
1098         if (sm == NULL)
1099                 return 0;
1100         sm->dot1xSuppEapolFramesRx++;
1101         if (len < sizeof(*hdr)) {
1102                 sm->dot1xSuppInvalidEapolFramesRx++;
1103                 return 0;
1104         }
1105         hdr = (const struct ieee802_1x_hdr *) buf;
1106         sm->dot1xSuppLastEapolFrameVersion = hdr->version;
1107         memcpy(sm->dot1xSuppLastEapolFrameSource, src, ETH_ALEN);
1108         if (hdr->version < EAPOL_VERSION) {
1109                 /* TODO: backwards compatibility */
1110         }
1111         plen = be_to_host16(hdr->length);
1112         if (plen > len - sizeof(*hdr)) {
1113                 sm->dot1xSuppEapLengthErrorFramesRx++;
1114                 return 0;
1115         }
1116         data_len = plen + sizeof(*hdr);
1117
1118         switch (hdr->type) {
1119         case IEEE802_1X_TYPE_EAP_PACKET:
1120                 if (sm->cached_pmk) {
1121                         /* Trying to use PMKSA caching, but Authenticator did
1122                          * not seem to have a matching entry. Need to restart
1123                          * EAPOL state machines.
1124                          */
1125                         eapol_sm_abort_cached(sm);
1126                 }
1127                 free(sm->eapReqData);
1128                 sm->eapReqDataLen = plen;
1129                 sm->eapReqData = malloc(sm->eapReqDataLen);
1130                 if (sm->eapReqData) {
1131                         wpa_printf(MSG_DEBUG, "EAPOL: Received EAP-Packet "
1132                                    "frame");
1133                         memcpy(sm->eapReqData, (u8 *) (hdr + 1),
1134                                sm->eapReqDataLen);
1135                         sm->eapolEap = TRUE;
1136                         eapol_sm_step(sm);
1137                 }
1138                 break;
1139         case IEEE802_1X_TYPE_EAPOL_KEY:
1140                 if (plen < sizeof(*key)) {
1141                         wpa_printf(MSG_DEBUG, "EAPOL: Too short EAPOL-Key "
1142                                    "frame received");
1143                         break;
1144                 }
1145                 key = (const struct ieee802_1x_eapol_key *) (hdr + 1);
1146                 if (key->type == EAPOL_KEY_TYPE_WPA ||
1147                     key->type == EAPOL_KEY_TYPE_RSN) {
1148                         /* WPA Supplicant takes care of this frame. */
1149                         wpa_printf(MSG_DEBUG, "EAPOL: Ignoring WPA EAPOL-Key "
1150                                    "frame in EAPOL state machines");
1151                         res = 0;
1152                         break;
1153                 }
1154                 if (key->type != EAPOL_KEY_TYPE_RC4) {
1155                         wpa_printf(MSG_DEBUG, "EAPOL: Ignored unknown "
1156                                    "EAPOL-Key type %d", key->type);
1157                         break;
1158                 }
1159                 free(sm->last_rx_key);
1160                 sm->last_rx_key = malloc(data_len);
1161                 if (sm->last_rx_key) {
1162                         wpa_printf(MSG_DEBUG, "EAPOL: Received EAPOL-Key "
1163                                    "frame");
1164                         memcpy(sm->last_rx_key, buf, data_len);
1165                         sm->last_rx_key_len = data_len;
1166                         sm->rxKey = TRUE;
1167                         eapol_sm_step(sm);
1168                 }
1169                 break;
1170         default:
1171                 wpa_printf(MSG_DEBUG, "EAPOL: Received unknown EAPOL type %d",
1172                            hdr->type);
1173                 sm->dot1xSuppInvalidEapolFramesRx++;
1174                 break;
1175         }
1176
1177         return res;
1178 }
1179
1180
1181 /**
1182  * eapol_sm_notify_tx_eapol_key - Notification about transmitted EAPOL packet
1183  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
1184  *
1185  * Notify EAPOL station machine about transmitted EAPOL packet from an external
1186  * component, e.g., WPA. This will update the statistics.
1187  */
1188 void eapol_sm_notify_tx_eapol_key(struct eapol_sm *sm)
1189 {
1190         if (sm)
1191                 sm->dot1xSuppEapolFramesTx++;
1192 }
1193
1194
1195 /**
1196  * eapol_sm_notify_portEnabled - Notification about portEnabled change
1197  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
1198  * @enabled: New portEnabled value
1199  *
1200  * Notify EAPOL station machine about new portEnabled value.
1201  */
1202 void eapol_sm_notify_portEnabled(struct eapol_sm *sm, Boolean enabled)
1203 {
1204         if (sm == NULL)
1205                 return;
1206         wpa_printf(MSG_DEBUG, "EAPOL: External notification - "
1207                    "portEnabled=%d", enabled);
1208         sm->portEnabled = enabled;
1209         eapol_sm_step(sm);
1210 }
1211
1212
1213 /**
1214  * eapol_sm_notify_portValid - Notification about portValid change
1215  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
1216  * @valid: New portValid value
1217  *
1218  * Notify EAPOL station machine about new portValid value.
1219  */
1220 void eapol_sm_notify_portValid(struct eapol_sm *sm, Boolean valid)
1221 {
1222         if (sm == NULL)
1223                 return;
1224         wpa_printf(MSG_DEBUG, "EAPOL: External notification - "
1225                    "portValid=%d", valid);
1226         sm->portValid = valid;
1227         eapol_sm_step(sm);
1228 }
1229
1230
1231 /**
1232  * eapol_sm_notify_eap_success - Notification of external EAP success trigger
1233  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
1234  * @success: %TRUE = set success, %FALSE = clear success
1235  *
1236  * Notify EAPOL station machine that external event has forced EAP state to
1237  * success (success = %TRUE). This can be cleared by setting success = %FALSE.
1238  *
1239  * This function is called to update EAP state when WPA-PSK key handshake has
1240  * been completed successfully since WPA-PSK does not use EAP state machine.
1241  */
1242 void eapol_sm_notify_eap_success(struct eapol_sm *sm, Boolean success)
1243 {
1244         if (sm == NULL)
1245                 return;
1246         wpa_printf(MSG_DEBUG, "EAPOL: External notification - "
1247                    "EAP success=%d", success);
1248         sm->eapSuccess = success;
1249         sm->altAccept = success;
1250         if (success)
1251                 eap_notify_success(sm->eap);
1252         eapol_sm_step(sm);
1253 }
1254
1255
1256 /**
1257  * eapol_sm_notify_eap_fail - Notification of external EAP failure trigger
1258  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
1259  * @fail: %TRUE = set failure, %FALSE = clear failure
1260  *
1261  * Notify EAPOL station machine that external event has forced EAP state to
1262  * failure (fail = %TRUE). This can be cleared by setting fail = %FALSE.
1263  */
1264 void eapol_sm_notify_eap_fail(struct eapol_sm *sm, Boolean fail)
1265 {
1266         if (sm == NULL)
1267                 return;
1268         wpa_printf(MSG_DEBUG, "EAPOL: External notification - "
1269                    "EAP fail=%d", fail);
1270         sm->eapFail = fail;
1271         sm->altReject = fail;
1272         eapol_sm_step(sm);
1273 }
1274
1275
1276 /**
1277  * eapol_sm_notify_config - Notification of EAPOL configuration change
1278  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
1279  * @config: Pointer to current network configuration
1280  * @conf: Pointer to EAPOL configuration data
1281  *
1282  * Notify EAPOL station machine that configuration has changed. config will be
1283  * stored as a backpointer to network configuration. This can be %NULL to clear
1284  * the stored pointed. conf will be copied to local EAPOL/EAP configuration
1285  * data. If conf is %NULL, this part of the configuration change will be
1286  * skipped.
1287  */
1288 void eapol_sm_notify_config(struct eapol_sm *sm, struct wpa_ssid *config,
1289                             const struct eapol_config *conf)
1290 {
1291         if (sm == NULL)
1292                 return;
1293
1294         sm->config = config;
1295
1296         if (conf == NULL)
1297                 return;
1298
1299         sm->conf.accept_802_1x_keys = conf->accept_802_1x_keys;
1300         sm->conf.required_keys = conf->required_keys;
1301         sm->conf.fast_reauth = conf->fast_reauth;
1302         if (sm->eap) {
1303                 eap_set_fast_reauth(sm->eap, conf->fast_reauth);
1304                 eap_set_workaround(sm->eap, conf->workaround);
1305                 eap_set_force_disabled(sm->eap, conf->eap_disabled);
1306         }
1307 }
1308
1309
1310 /**
1311  * eapol_sm_get_key - Get master session key (MSK) from EAP
1312  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
1313  * @key: Pointer for key buffer
1314  * @len: Number of bytes to copy to key
1315  * Returns: 0 on success (len of key available), maximum available key len
1316  * (>0) if key is available but it is shorter than len, or -1 on failure.
1317  *
1318  * Fetch EAP keying material (MSK, eapKeyData) from EAP state machine. The key
1319  * is available only after a successful authentication.
1320  */
1321 int eapol_sm_get_key(struct eapol_sm *sm, u8 *key, size_t len)
1322 {
1323         const u8 *eap_key;
1324         size_t eap_len;
1325
1326         if (sm == NULL || !eap_key_available(sm->eap))
1327                 return -1;
1328         eap_key = eap_get_eapKeyData(sm->eap, &eap_len);
1329         if (eap_key == NULL)
1330                 return -1;
1331         if (len > eap_len)
1332                 return eap_len;
1333         memcpy(key, eap_key, len);
1334         return 0;
1335 }
1336
1337
1338 /**
1339  * eapol_sm_notify_logoff - Notification of logon/logoff commands
1340  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
1341  * @logoff: Whether command was logoff
1342  *
1343  * Notify EAPOL state machines that user requested logon/logoff.
1344  */
1345 void eapol_sm_notify_logoff(struct eapol_sm *sm, Boolean logoff)
1346 {
1347         if (sm) {
1348                 sm->userLogoff = logoff;
1349                 eapol_sm_step(sm);
1350         }
1351 }
1352
1353
1354 /**
1355  * eapol_sm_notify_pmkid_attempt - Notification of successful PMKSA caching
1356  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
1357  *
1358  * Notify EAPOL state machines that PMKSA caching was successful. This is used
1359  * to move EAPOL and EAP state machines into authenticated/successful state.
1360  */
1361 void eapol_sm_notify_cached(struct eapol_sm *sm)
1362 {
1363         if (sm == NULL)
1364                 return;
1365         sm->SUPP_PAE_state = SUPP_PAE_AUTHENTICATED;
1366         sm->suppPortStatus = Authorized;
1367         eap_notify_success(sm->eap);
1368 }
1369
1370
1371 /**
1372  * eapol_sm_notify_pmkid_attempt - Notification of PMKSA caching
1373  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
1374  * @attempt: Whether PMKSA caching is tried
1375  *
1376  * Notify EAPOL state machines whether PMKSA caching is used.
1377  */
1378 void eapol_sm_notify_pmkid_attempt(struct eapol_sm *sm, int attempt)
1379 {
1380         if (sm == NULL)
1381                 return;
1382         if (attempt) {
1383                 wpa_printf(MSG_DEBUG, "RSN: Trying to use cached PMKSA");
1384                 sm->cached_pmk = TRUE;
1385         } else {
1386                 wpa_printf(MSG_DEBUG, "RSN: Do not try to use cached PMKSA");
1387                 sm->cached_pmk = FALSE;
1388         }
1389 }
1390
1391
1392 static void eapol_sm_abort_cached(struct eapol_sm *sm)
1393 {
1394         wpa_printf(MSG_DEBUG, "RSN: Authenticator did not accept PMKID, "
1395                    "doing full EAP authentication");
1396         if (sm == NULL)
1397                 return;
1398         sm->cached_pmk = FALSE;
1399         sm->SUPP_PAE_state = SUPP_PAE_CONNECTING;
1400         sm->suppPortStatus = Unauthorized;
1401
1402         /* Make sure we do not start sending EAPOL-Start frames first, but
1403          * instead move to RESTART state to start EAPOL authentication. */
1404         sm->startWhen = 3;
1405
1406         if (sm->ctx->aborted_cached)
1407                 sm->ctx->aborted_cached(sm->ctx->ctx);
1408 }
1409
1410
1411 /**
1412  * eapol_sm_register_scard_ctx - Notification of smart card context
1413  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
1414  * @ctx: Context data for smart card operations
1415  *
1416  * Notify EAPOL state machines of context data for smart card operations. This
1417  * context data will be used as a parameter for scard_*() functions.
1418  */
1419 void eapol_sm_register_scard_ctx(struct eapol_sm *sm, void *ctx)
1420 {
1421         if (sm) {
1422                 sm->ctx->scard_ctx = ctx;
1423                 eap_register_scard_ctx(sm->eap, ctx);
1424         }
1425 }
1426
1427
1428 /**
1429  * eapol_sm_notify_portControl - Notification of portControl changes
1430  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
1431  * @portControl: New value for portControl variable
1432  *
1433  * Notify EAPOL state machines that portControl variable has changed.
1434  */
1435 void eapol_sm_notify_portControl(struct eapol_sm *sm, PortControl portControl)
1436 {
1437         if (sm == NULL)
1438                 return;
1439         wpa_printf(MSG_DEBUG, "EAPOL: External notification - "
1440                    "portControl=%s", eapol_port_control(portControl));
1441         sm->portControl = portControl;
1442         eapol_sm_step(sm);
1443 }
1444
1445
1446 /**
1447  * eapol_sm_notify_ctrl_attached - Notification of attached monitor
1448  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
1449  *
1450  * Notify EAPOL state machines that a monitor was attached to the control
1451  * interface to trigger re-sending of pending requests for user input.
1452  */
1453 void eapol_sm_notify_ctrl_attached(struct eapol_sm *sm)
1454 {
1455         if (sm == NULL)
1456                 return;
1457         eap_sm_notify_ctrl_attached(sm->eap);
1458 }
1459
1460
1461 /**
1462  * eapol_sm_notify_ctrl_response - Notification of received user input
1463  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
1464  *
1465  * Notify EAPOL state machines that a control response, i.e., user
1466  * input, was received in order to trigger retrying of a pending EAP request.
1467  */
1468 void eapol_sm_notify_ctrl_response(struct eapol_sm *sm)
1469 {
1470         if (sm == NULL)
1471                 return;
1472         if (sm->eapReqData && !sm->eapReq) {
1473                 wpa_printf(MSG_DEBUG, "EAPOL: received control response (user "
1474                            "input) notification - retrying pending EAP "
1475                            "Request");
1476                 sm->eapolEap = TRUE;
1477                 sm->eapReq = TRUE;
1478                 eapol_sm_step(sm);
1479         }
1480 }
1481
1482
1483 /**
1484  * eapol_sm_request_reauth - Request reauthentication
1485  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
1486  *
1487  * This function can be used to request EAPOL reauthentication, e.g., when the
1488  * current PMKSA entry is nearing expiration.
1489  */
1490 void eapol_sm_request_reauth(struct eapol_sm *sm)
1491 {
1492         if (sm == NULL || sm->SUPP_PAE_state != SUPP_PAE_AUTHENTICATED)
1493                 return;
1494         eapol_sm_txStart(sm);
1495 }
1496
1497
1498 /**
1499  * eapol_sm_notify_lower_layer_success - Notification of lower layer success
1500  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
1501  *
1502  * Notify EAPOL (and EAP) state machines that a lower layer has detected a
1503  * successful authentication. This is used to recover from dropped EAP-Success
1504  * messages.
1505  */
1506 void eapol_sm_notify_lower_layer_success(struct eapol_sm *sm)
1507 {
1508         if (sm == NULL)
1509                 return;
1510         eap_notify_lower_layer_success(sm->eap);
1511 }
1512
1513
1514 static struct wpa_ssid * eapol_sm_get_config(void *ctx)
1515 {
1516         struct eapol_sm *sm = ctx;
1517         return sm ? sm->config : NULL;
1518 }
1519
1520
1521 static u8 * eapol_sm_get_eapReqData(void *ctx, size_t *len)
1522 {
1523         struct eapol_sm *sm = ctx;
1524         if (sm == NULL || sm->eapReqData == NULL) {
1525                 *len = 0;
1526                 return NULL;
1527         }
1528
1529         *len = sm->eapReqDataLen;
1530         return sm->eapReqData;
1531 }
1532
1533
1534 static Boolean eapol_sm_get_bool(void *ctx, enum eapol_bool_var variable)
1535 {
1536         struct eapol_sm *sm = ctx;
1537         if (sm == NULL)
1538                 return FALSE;
1539         switch (variable) {
1540         case EAPOL_eapSuccess:
1541                 return sm->eapSuccess;
1542         case EAPOL_eapRestart:
1543                 return sm->eapRestart;
1544         case EAPOL_eapFail:
1545                 return sm->eapFail;
1546         case EAPOL_eapResp:
1547                 return sm->eapResp;
1548         case EAPOL_eapNoResp:
1549                 return sm->eapNoResp;
1550         case EAPOL_eapReq:
1551                 return sm->eapReq;
1552         case EAPOL_portEnabled:
1553                 return sm->portEnabled;
1554         case EAPOL_altAccept:
1555                 return sm->altAccept;
1556         case EAPOL_altReject:
1557                 return sm->altReject;
1558         }
1559         return FALSE;
1560 }
1561
1562
1563 static void eapol_sm_set_bool(void *ctx, enum eapol_bool_var variable,
1564                               Boolean value)
1565 {
1566         struct eapol_sm *sm = ctx;
1567         if (sm == NULL)
1568                 return;
1569         switch (variable) {
1570         case EAPOL_eapSuccess:
1571                 sm->eapSuccess = value;
1572                 break;
1573         case EAPOL_eapRestart:
1574                 sm->eapRestart = value;
1575                 break;
1576         case EAPOL_eapFail:
1577                 sm->eapFail = value;
1578                 break;
1579         case EAPOL_eapResp:
1580                 sm->eapResp = value;
1581                 break;
1582         case EAPOL_eapNoResp:
1583                 sm->eapNoResp = value;
1584                 break;
1585         case EAPOL_eapReq:
1586                 sm->eapReq = value;
1587                 break;
1588         case EAPOL_portEnabled:
1589                 sm->portEnabled = value;
1590                 break;
1591         case EAPOL_altAccept:
1592                 sm->altAccept = value;
1593                 break;
1594         case EAPOL_altReject:
1595                 sm->altReject = value;
1596                 break;
1597         }
1598 }
1599
1600
1601 static unsigned int eapol_sm_get_int(void *ctx, enum eapol_int_var variable)
1602 {
1603         struct eapol_sm *sm = ctx;
1604         if (sm == NULL)
1605                 return 0;
1606         switch (variable) {
1607         case EAPOL_idleWhile:
1608                 return sm->idleWhile;
1609         }
1610         return 0;
1611 }
1612
1613
1614 static void eapol_sm_set_int(void *ctx, enum eapol_int_var variable,
1615                              unsigned int value)
1616 {
1617         struct eapol_sm *sm = ctx;
1618         if (sm == NULL)
1619                 return;
1620         switch (variable) {
1621         case EAPOL_idleWhile:
1622                 sm->idleWhile = value;
1623                 break;
1624         }
1625 }
1626
1627
1628 static void eapol_sm_set_config_blob(void *ctx, struct wpa_config_blob *blob)
1629 {
1630         struct eapol_sm *sm = ctx;
1631         if (sm && sm->ctx && sm->ctx->set_config_blob)
1632                 sm->ctx->set_config_blob(sm->ctx->ctx, blob);
1633 }
1634
1635
1636 static const struct wpa_config_blob *
1637 eapol_sm_get_config_blob(void *ctx, const char *name)
1638 {
1639         struct eapol_sm *sm = ctx;
1640         if (sm && sm->ctx && sm->ctx->get_config_blob)
1641                 return sm->ctx->get_config_blob(sm->ctx->ctx, name);
1642         else
1643                 return NULL;
1644 }
1645
1646
1647 static struct eapol_callbacks eapol_cb =
1648 {
1649         .get_config = eapol_sm_get_config,
1650         .get_bool = eapol_sm_get_bool,
1651         .set_bool = eapol_sm_set_bool,
1652         .get_int = eapol_sm_get_int,
1653         .set_int = eapol_sm_set_int,
1654         .get_eapReqData = eapol_sm_get_eapReqData,
1655         .set_config_blob = eapol_sm_set_config_blob,
1656         .get_config_blob = eapol_sm_get_config_blob,
1657 };
1658
1659
1660 /**
1661  * eapol_sm_init - Initialize EAPOL state machine
1662  * @ctx: Pointer to EAPOL context data; this needs to be an allocated buffer
1663  * and EAPOL state machine will free it in eapol_sm_deinit()
1664  * Returns: Pointer to the allocated EAPOL state machine or %NULL on failure
1665  *
1666  * Allocate and initialize an EAPOL state machine.
1667  */
1668 struct eapol_sm *eapol_sm_init(struct eapol_ctx *ctx)
1669 {
1670         struct eapol_sm *sm;
1671         struct eap_config conf;
1672         sm = malloc(sizeof(*sm));
1673         if (sm == NULL)
1674                 return NULL;
1675         memset(sm, 0, sizeof(*sm));
1676         sm->ctx = ctx;
1677
1678         sm->portControl = Auto;
1679
1680         /* Supplicant PAE state machine */
1681         sm->heldPeriod = 60;
1682         sm->startPeriod = 30;
1683         sm->maxStart = 3;
1684
1685         /* Supplicant Backend state machine */
1686         sm->authPeriod = 30;
1687
1688         memset(&conf, 0, sizeof(conf));
1689         conf.opensc_engine_path = ctx->opensc_engine_path;
1690         conf.pkcs11_engine_path = ctx->pkcs11_engine_path;
1691         conf.pkcs11_module_path = ctx->pkcs11_module_path;
1692
1693         sm->eap = eap_sm_init(sm, &eapol_cb, sm->ctx->msg_ctx, &conf);
1694         if (sm->eap == NULL) {
1695                 free(sm);
1696                 return NULL;
1697         }
1698
1699         /* Initialize EAPOL state machines */
1700         sm->initialize = TRUE;
1701         eapol_sm_step(sm);
1702         sm->initialize = FALSE;
1703         eapol_sm_step(sm);
1704
1705         eloop_register_timeout(1, 0, eapol_port_timers_tick, NULL, sm);
1706
1707         return sm;
1708 }
1709
1710
1711 /**
1712  * eapol_sm_deinit - Deinitialize EAPOL state machine
1713  * @sm: Pointer to EAPOL state machine allocated with eapol_sm_init()
1714  *
1715  * Deinitialize and free EAPOL state machine.
1716  */
1717 void eapol_sm_deinit(struct eapol_sm *sm)
1718 {
1719         if (sm == NULL)
1720                 return;
1721         eloop_cancel_timeout(eapol_sm_step_timeout, NULL, sm);
1722         eloop_cancel_timeout(eapol_port_timers_tick, NULL, sm);
1723         eap_sm_deinit(sm->eap);
1724         free(sm->last_rx_key);
1725         free(sm->eapReqData);
1726         free(sm->ctx);
1727         free(sm);
1728 }