libeap/src/eap_server/eap_server_peap.c

   1 /*
   2  * hostapd / EAP-PEAP (draft-josefsson-pppext-eap-tls-eap-10.txt)
   3  * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "crypto/sha1.h"
  13 #include "crypto/tls.h"
  14 #include "crypto/random.h"
  15 #include "eap_i.h"
  16 #include "eap_tls_common.h"
  17 #include "eap_common/eap_tlv_common.h"
  18 #include "eap_common/eap_peap_common.h"
  19 #include "tncs.h"
  20
  21
  22 /* Maximum supported PEAP version
  23  * 0 = Microsoft's PEAP version 0; draft-kamath-pppext-peapv0-00.txt
  24  * 1 = draft-josefsson-ppext-eap-tls-eap-05.txt
  25  */
  26 #define EAP_PEAP_VERSION 1
  27
  28
  29 static void eap_peap_reset(struct eap_sm *sm, void *priv);
  30
  31
  32 struct eap_peap_data {
  33         struct eap_ssl_data ssl;
  34         enum {
  35                 START, PHASE1, PHASE1_ID2, PHASE2_START, PHASE2_ID,
  36                 PHASE2_METHOD, PHASE2_SOH,
  37                 PHASE2_TLV, SUCCESS_REQ, FAILURE_REQ, SUCCESS, FAILURE
  38         } state;
  39
  40         int peap_version;
  41         int recv_version;
  42         const struct eap_method *phase2_method;
  43         void *phase2_priv;
  44         int force_version;
  45         struct wpabuf *pending_phase2_resp;
  46         enum { TLV_REQ_NONE, TLV_REQ_SUCCESS, TLV_REQ_FAILURE } tlv_request;
  47         int crypto_binding_sent;
  48         int crypto_binding_used;
  49         enum { NO_BINDING, OPTIONAL_BINDING, REQUIRE_BINDING } crypto_binding;
  50         u8 binding_nonce[32];
  51         u8 ipmk[40];
  52         u8 cmk[20];
  53         u8 *phase2_key;
  54         size_t phase2_key_len;
  55         struct wpabuf *soh_response;
  56 };
  57
  58
  59 static const char * eap_peap_state_txt(int state)
  60 {
  61         switch (state) {
  62         case START:
  63                 return "START";
  64         case PHASE1:
  65                 return "PHASE1";
  66         case PHASE1_ID2:
  67                 return "PHASE1_ID2";
  68         case PHASE2_START:
  69                 return "PHASE2_START";
  70         case PHASE2_ID:
  71                 return "PHASE2_ID";
  72         case PHASE2_METHOD:
  73                 return "PHASE2_METHOD";
  74         case PHASE2_SOH:
  75                 return "PHASE2_SOH";
  76         case PHASE2_TLV:
  77                 return "PHASE2_TLV";
  78         case SUCCESS_REQ:
  79                 return "SUCCESS_REQ";
  80         case FAILURE_REQ:
  81                 return "FAILURE_REQ";
  82         case SUCCESS:
  83                 return "SUCCESS";
  84         case FAILURE:
  85                 return "FAILURE";
  86         default:
  87                 return "Unknown?!";
  88         }
  89 }
  90
  91
  92 static void eap_peap_state(struct eap_peap_data *data, int state)
  93 {
  94         wpa_printf(MSG_DEBUG, "EAP-PEAP: %s -> %s",
  95                    eap_peap_state_txt(data->state),
  96                    eap_peap_state_txt(state));
  97         data->state = state;
  98         if (state == FAILURE || state == FAILURE_REQ)
  99                 tls_connection_remove_session(data->ssl.conn);
 100 }
 101
 102
 103 static void eap_peap_valid_session(struct eap_sm *sm,
 104                                    struct eap_peap_data *data)
 105 {
 106         struct wpabuf *buf;
 107
 108         if (!sm->tls_session_lifetime ||
 109             tls_connection_resumed(sm->ssl_ctx, data->ssl.conn))
 110                 return;
 111
 112         buf = wpabuf_alloc(1 + 1 + sm->identity_len);
 113         if (!buf)
 114                 return;
 115         wpabuf_put_u8(buf, EAP_TYPE_PEAP);
 116         if (sm->identity) {
 117                 u8 id_len;
 118
 119                 if (sm->identity_len <= 255)
 120                         id_len = sm->identity_len;
 121                 else
 122                         id_len = 255;
 123                 wpabuf_put_u8(buf, id_len);
 124                 wpabuf_put_data(buf, sm->identity, id_len);
 125         } else {
 126                 wpabuf_put_u8(buf, 0);
 127         }
 128         tls_connection_set_success_data(data->ssl.conn, buf);
 129 }
 130
 131
 132 static void eap_peap_req_success(struct eap_sm *sm,
 133                                  struct eap_peap_data *data)
 134 {
 135         if (data->state == FAILURE || data->state == FAILURE_REQ) {
 136                 eap_peap_state(data, FAILURE);
 137                 return;
 138         }
 139
 140         if (data->peap_version == 0) {
 141                 data->tlv_request = TLV_REQ_SUCCESS;
 142                 eap_peap_state(data, PHASE2_TLV);
 143         } else {
 144                 eap_peap_state(data, SUCCESS_REQ);
 145         }
 146 }
 147
 148
 149 static void eap_peap_req_failure(struct eap_sm *sm,
 150                                  struct eap_peap_data *data)
 151 {
 152         if (data->state == FAILURE || data->state == FAILURE_REQ ||
 153             data->state == SUCCESS_REQ || data->tlv_request != TLV_REQ_NONE) {
 154                 eap_peap_state(data, FAILURE);
 155                 return;
 156         }
 157
 158         if (data->peap_version == 0) {
 159                 data->tlv_request = TLV_REQ_FAILURE;
 160                 eap_peap_state(data, PHASE2_TLV);
 161         } else {
 162                 eap_peap_state(data, FAILURE_REQ);
 163         }
 164 }
 165
 166
 167 static void * eap_peap_init(struct eap_sm *sm)
 168 {
 169         struct eap_peap_data *data;
 170
 171         data = os_zalloc(sizeof(*data));
 172         if (data == NULL)
 173                 return NULL;
 174         data->peap_version = EAP_PEAP_VERSION;
 175         data->force_version = -1;
 176         if (sm->user && sm->user->force_version >= 0) {
 177                 data->force_version = sm->user->force_version;
 178                 wpa_printf(MSG_DEBUG, "EAP-PEAP: forcing version %d",
 179                            data->force_version);
 180                 data->peap_version = data->force_version;
 181         }
 182         data->state = START;
 183         data->crypto_binding = OPTIONAL_BINDING;
 184
 185         if (eap_server_tls_ssl_init(sm, &data->ssl, 0, EAP_TYPE_PEAP)) {
 186                 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
 187                 eap_peap_reset(sm, data);
 188                 return NULL;
 189         }
 190
 191         return data;
 192 }
 193
 194
 195 static void eap_peap_reset(struct eap_sm *sm, void *priv)
 196 {
 197         struct eap_peap_data *data = priv;
 198         if (data == NULL)
 199                 return;
 200         if (data->phase2_priv && data->phase2_method)
 201                 data->phase2_method->reset(sm, data->phase2_priv);
 202         eap_server_tls_ssl_deinit(sm, &data->ssl);
 203         wpabuf_free(data->pending_phase2_resp);
 204         os_free(data->phase2_key);
 205         wpabuf_free(data->soh_response);
 206         bin_clear_free(data, sizeof(*data));
 207 }
 208
 209
 210 static struct wpabuf * eap_peap_build_start(struct eap_sm *sm,
 211                                             struct eap_peap_data *data, u8 id)
 212 {
 213         struct wpabuf *req;
 214
 215         req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PEAP, 1,
 216                             EAP_CODE_REQUEST, id);
 217         if (req == NULL) {
 218                 wpa_printf(MSG_ERROR, "EAP-PEAP: Failed to allocate memory for"
 219                            " request");
 220                 eap_peap_state(data, FAILURE);
 221                 return NULL;
 222         }
 223
 224         wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->peap_version);
 225
 226         eap_peap_state(data, PHASE1);
 227
 228         return req;
 229 }
 230
 231
 232 static struct wpabuf * eap_peap_build_phase2_req(struct eap_sm *sm,
 233                                                  struct eap_peap_data *data,
 234                                                  u8 id)
 235 {
 236         struct wpabuf *buf, *encr_req, msgbuf;
 237         const u8 *req;
 238         size_t req_len;
 239
 240         if (data->phase2_method == NULL || data->phase2_priv == NULL) {
 241                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 method not ready");
 242                 return NULL;
 243         }
 244         buf = data->phase2_method->buildReq(sm, data->phase2_priv, id);
 245         if (buf == NULL)
 246                 return NULL;
 247
 248         req = wpabuf_head(buf);
 249         req_len = wpabuf_len(buf);
 250         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 data",
 251                         req, req_len);
 252
 253         if (data->peap_version == 0 &&
 254             data->phase2_method->method != EAP_TYPE_TLV) {
 255                 req += sizeof(struct eap_hdr);
 256                 req_len -= sizeof(struct eap_hdr);
 257         }
 258
 259         wpabuf_set(&msgbuf, req, req_len);
 260         encr_req = eap_server_tls_encrypt(sm, &data->ssl, &msgbuf);
 261         wpabuf_free(buf);
 262
 263         return encr_req;
 264 }
 265
 266
 267 #ifdef EAP_SERVER_TNC
 268 static struct wpabuf * eap_peap_build_phase2_soh(struct eap_sm *sm,
 269                                                  struct eap_peap_data *data,
 270                                                  u8 id)
 271 {
 272         struct wpabuf *buf1, *buf, *encr_req, msgbuf;
 273         const u8 *req;
 274         size_t req_len;
 275
 276         buf1 = tncs_build_soh_request();
 277         if (buf1 == NULL)
 278                 return NULL;
 279
 280         buf = eap_msg_alloc(EAP_VENDOR_MICROSOFT, 0x21, wpabuf_len(buf1),
 281                             EAP_CODE_REQUEST, id);
 282         if (buf == NULL) {
 283                 wpabuf_free(buf1);
 284                 return NULL;
 285         }
 286         wpabuf_put_buf(buf, buf1);
 287         wpabuf_free(buf1);
 288
 289         req = wpabuf_head(buf);
 290         req_len = wpabuf_len(buf);
 291
 292         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 SOH data",
 293                         req, req_len);
 294
 295         req += sizeof(struct eap_hdr);
 296         req_len -= sizeof(struct eap_hdr);
 297         wpabuf_set(&msgbuf, req, req_len);
 298
 299         encr_req = eap_server_tls_encrypt(sm, &data->ssl, &msgbuf);
 300         wpabuf_free(buf);
 301
 302         return encr_req;
 303 }
 304 #endif /* EAP_SERVER_TNC */
 305
 306
 307 static void eap_peap_get_isk(struct eap_peap_data *data,
 308                              u8 *isk, size_t isk_len)
 309 {
 310         size_t key_len;
 311
 312         os_memset(isk, 0, isk_len);
 313         if (data->phase2_key == NULL)
 314                 return;
 315
 316         key_len = data->phase2_key_len;
 317         if (key_len > isk_len)
 318                 key_len = isk_len;
 319         os_memcpy(isk, data->phase2_key, key_len);
 320 }
 321
 322
 323 static int eap_peap_derive_cmk(struct eap_sm *sm, struct eap_peap_data *data)
 324 {
 325         u8 *tk;
 326         u8 isk[32], imck[60];
 327
 328         /*
 329          * Tunnel key (TK) is the first 60 octets of the key generated by
 330          * phase 1 of PEAP (based on TLS).
 331          */
 332         tk = eap_server_tls_derive_key(sm, &data->ssl, "client EAP encryption",
 333                                        EAP_TLS_KEY_LEN);
 334         if (tk == NULL)
 335                 return -1;
 336         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60);
 337
 338         eap_peap_get_isk(data, isk, sizeof(isk));
 339         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk));
 340
 341         /*
 342          * IPMK Seed = "Inner Methods Compound Keys" | ISK
 343          * TempKey = First 40 octets of TK
 344          * IPMK|CMK = PRF+(TempKey, IPMK Seed, 60)
 345          * (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space
 346          * in the end of the label just before ISK; is that just a typo?)
 347          */
 348         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40);
 349         if (peap_prfplus(data->peap_version, tk, 40,
 350                          "Inner Methods Compound Keys",
 351                          isk, sizeof(isk), imck, sizeof(imck)) < 0) {
 352                 os_free(tk);
 353                 return -1;
 354         }
 355         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
 356                         imck, sizeof(imck));
 357
 358         os_free(tk);
 359
 360         /* TODO: fast-connect: IPMK|CMK = TK */
 361         os_memcpy(data->ipmk, imck, 40);
 362         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
 363         os_memcpy(data->cmk, imck + 40, 20);
 364         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);
 365
 366         return 0;
 367 }
 368
 369
 370 static struct wpabuf * eap_peap_build_phase2_tlv(struct eap_sm *sm,
 371                                                  struct eap_peap_data *data,
 372                                                  u8 id)
 373 {
 374         struct wpabuf *buf, *encr_req;
 375         size_t mlen;
 376
 377         mlen = 6; /* Result TLV */
 378         if (data->peap_version == 0 && data->tlv_request == TLV_REQ_SUCCESS &&
 379             data->crypto_binding != NO_BINDING) {
 380                 mlen += 60; /* Cryptobinding TLV */
 381 #ifdef EAP_SERVER_TNC
 382                 if (data->soh_response)
 383                         mlen += wpabuf_len(data->soh_response);
 384 #endif /* EAP_SERVER_TNC */
 385         }
 386
 387         buf = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, mlen,
 388                             EAP_CODE_REQUEST, id);
 389         if (buf == NULL)
 390                 return NULL;
 391
 392         wpabuf_put_u8(buf, 0x80); /* Mandatory */
 393         wpabuf_put_u8(buf, EAP_TLV_RESULT_TLV);
 394         /* Length */
 395         wpabuf_put_be16(buf, 2);
 396         /* Status */
 397         wpabuf_put_be16(buf, data->tlv_request == TLV_REQ_SUCCESS ?
 398                         EAP_TLV_RESULT_SUCCESS : EAP_TLV_RESULT_FAILURE);
 399
 400         if (data->peap_version == 0 && data->tlv_request == TLV_REQ_SUCCESS &&
 401             data->crypto_binding != NO_BINDING) {
 402                 u8 *mac;
 403                 u8 eap_type = EAP_TYPE_PEAP;
 404                 const u8 *addr[2];
 405                 size_t len[2];
 406                 u16 tlv_type;
 407
 408 #ifdef EAP_SERVER_TNC
 409                 if (data->soh_response) {
 410                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Adding MS-SOH "
 411                                    "Response TLV");
 412                         wpabuf_put_buf(buf, data->soh_response);
 413                         wpabuf_free(data->soh_response);
 414                         data->soh_response = NULL;
 415                 }
 416 #endif /* EAP_SERVER_TNC */
 417
 418                 if (eap_peap_derive_cmk(sm, data) < 0 ||
 419                     random_get_bytes(data->binding_nonce, 32)) {
 420                         wpabuf_free(buf);
 421                         return NULL;
 422                 }
 423
 424                 /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
 425                 addr[0] = wpabuf_put(buf, 0);
 426                 len[0] = 60;
 427                 addr[1] = &eap_type;
 428                 len[1] = 1;
 429
 430                 tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
 431                 wpabuf_put_be16(buf, tlv_type);
 432                 wpabuf_put_be16(buf, 56);
 433
 434                 wpabuf_put_u8(buf, 0); /* Reserved */
 435                 wpabuf_put_u8(buf, data->peap_version); /* Version */
 436                 wpabuf_put_u8(buf, data->recv_version); /* RecvVersion */
 437                 wpabuf_put_u8(buf, 0); /* SubType: 0 = Request, 1 = Response */
 438                 wpabuf_put_data(buf, data->binding_nonce, 32); /* Nonce */
 439                 mac = wpabuf_put(buf, 20); /* Compound_MAC */
 440                 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK",
 441                             data->cmk, 20);
 442                 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
 443                             addr[0], len[0]);
 444                 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
 445                             addr[1], len[1]);
 446                 hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac);
 447                 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC",
 448                             mac, SHA1_MAC_LEN);
 449                 data->crypto_binding_sent = 1;
 450         }
 451
 452         wpa_hexdump_buf_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 TLV data",
 453                             buf);
 454
 455         encr_req = eap_server_tls_encrypt(sm, &data->ssl, buf);
 456         wpabuf_free(buf);
 457
 458         return encr_req;
 459 }
 460
 461
 462 static struct wpabuf * eap_peap_build_phase2_term(struct eap_sm *sm,
 463                                                   struct eap_peap_data *data,
 464                                                   u8 id, int success)
 465 {
 466         struct wpabuf *encr_req, msgbuf;
 467         size_t req_len;
 468         struct eap_hdr *hdr;
 469
 470         req_len = sizeof(*hdr);
 471         hdr = os_zalloc(req_len);
 472         if (hdr == NULL)
 473                 return NULL;
 474
 475         hdr->code = success ? EAP_CODE_SUCCESS : EAP_CODE_FAILURE;
 476         hdr->identifier = id;
 477         hdr->length = host_to_be16(req_len);
 478
 479         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 data",
 480                         (u8 *) hdr, req_len);
 481
 482         wpabuf_set(&msgbuf, hdr, req_len);
 483         encr_req = eap_server_tls_encrypt(sm, &data->ssl, &msgbuf);
 484         os_free(hdr);
 485
 486         return encr_req;
 487 }
 488
 489
 490 static struct wpabuf * eap_peap_buildReq(struct eap_sm *sm, void *priv, u8 id)
 491 {
 492         struct eap_peap_data *data = priv;
 493
 494         if (data->ssl.state == FRAG_ACK) {
 495                 return eap_server_tls_build_ack(id, EAP_TYPE_PEAP,
 496                                                 data->peap_version);
 497         }
 498
 499         if (data->ssl.state == WAIT_FRAG_ACK) {
 500                 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_PEAP,
 501                                                 data->peap_version, id);
 502         }
 503
 504         switch (data->state) {
 505         case START:
 506                 return eap_peap_build_start(sm, data, id);
 507         case PHASE1:
 508         case PHASE1_ID2:
 509                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
 510                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase1 done, "
 511                                    "starting Phase2");
 512                         eap_peap_state(data, PHASE2_START);
 513                 }
 514                 break;
 515         case PHASE2_ID:
 516         case PHASE2_METHOD:
 517                 wpabuf_free(data->ssl.tls_out);
 518                 data->ssl.tls_out_pos = 0;
 519                 data->ssl.tls_out = eap_peap_build_phase2_req(sm, data, id);
 520                 break;
 521 #ifdef EAP_SERVER_TNC
 522         case PHASE2_SOH:
 523                 wpabuf_free(data->ssl.tls_out);
 524                 data->ssl.tls_out_pos = 0;
 525                 data->ssl.tls_out = eap_peap_build_phase2_soh(sm, data, id);
 526                 break;
 527 #endif /* EAP_SERVER_TNC */
 528         case PHASE2_TLV:
 529                 wpabuf_free(data->ssl.tls_out);
 530                 data->ssl.tls_out_pos = 0;
 531                 data->ssl.tls_out = eap_peap_build_phase2_tlv(sm, data, id);
 532                 break;
 533         case SUCCESS_REQ:
 534                 wpabuf_free(data->ssl.tls_out);
 535                 data->ssl.tls_out_pos = 0;
 536                 data->ssl.tls_out = eap_peap_build_phase2_term(sm, data, id,
 537                                                                1);
 538                 break;
 539         case FAILURE_REQ:
 540                 wpabuf_free(data->ssl.tls_out);
 541                 data->ssl.tls_out_pos = 0;
 542                 data->ssl.tls_out = eap_peap_build_phase2_term(sm, data, id,
 543                                                                0);
 544                 break;
 545         default:
 546                 wpa_printf(MSG_DEBUG, "EAP-PEAP: %s - unexpected state %d",
 547                            __func__, data->state);
 548                 return NULL;
 549         }
 550
 551         return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_PEAP,
 552                                         data->peap_version, id);
 553 }
 554
 555
 556 static Boolean eap_peap_check(struct eap_sm *sm, void *priv,
 557                               struct wpabuf *respData)
 558 {
 559         const u8 *pos;
 560         size_t len;
 561
 562         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PEAP, respData, &len);
 563         if (pos == NULL || len < 1) {
 564                 wpa_printf(MSG_INFO, "EAP-PEAP: Invalid frame");
 565                 return TRUE;
 566         }
 567
 568         return FALSE;
 569 }
 570
 571
 572 static int eap_peap_phase2_init(struct eap_sm *sm, struct eap_peap_data *data,
 573                                 int vendor, EapType eap_type)
 574 {
 575         if (data->phase2_priv && data->phase2_method) {
 576                 data->phase2_method->reset(sm, data->phase2_priv);
 577                 data->phase2_method = NULL;
 578                 data->phase2_priv = NULL;
 579         }
 580         data->phase2_method = eap_server_get_eap_method(vendor, eap_type);
 581         if (!data->phase2_method)
 582                 return -1;
 583
 584         sm->init_phase2 = 1;
 585         data->phase2_priv = data->phase2_method->init(sm);
 586         sm->init_phase2 = 0;
 587         return 0;
 588 }
 589
 590
 591 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
 592                                           struct eap_peap_data *data,
 593                                           const u8 *crypto_tlv,
 594                                           size_t crypto_tlv_len)
 595 {
 596         u8 buf[61], mac[SHA1_MAC_LEN];
 597         const u8 *pos;
 598
 599         if (crypto_tlv_len != 4 + 56) {
 600                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
 601                            "length %d", (int) crypto_tlv_len);
 602                 return -1;
 603         }
 604
 605         pos = crypto_tlv;
 606         pos += 4; /* TLV header */
 607         if (pos[1] != data->peap_version) {
 608                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
 609                            "mismatch (was %d; expected %d)",
 610                            pos[1], data->peap_version);
 611                 return -1;
 612         }
 613
 614         if (pos[3] != 1) {
 615                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
 616                            "SubType %d", pos[3]);
 617                 return -1;
 618         }
 619         pos += 4;
 620         pos += 32; /* Nonce */
 621
 622         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
 623         os_memcpy(buf, crypto_tlv, 60);
 624         os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
 625         buf[60] = EAP_TYPE_PEAP;
 626         hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
 627
 628         if (os_memcmp_const(mac, pos, SHA1_MAC_LEN) != 0) {
 629                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
 630                            "cryptobinding TLV");
 631                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK", data->cmk, 20);
 632                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding seed data",
 633                             buf, 61);
 634                 return -1;
 635         }
 636
 637         wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
 638
 639         return 0;
 640 }
 641
 642
 643 static void eap_peap_process_phase2_tlv(struct eap_sm *sm,
 644                                         struct eap_peap_data *data,
 645                                         struct wpabuf *in_data)
 646 {
 647         const u8 *pos;
 648         size_t left;
 649         const u8 *result_tlv = NULL, *crypto_tlv = NULL;
 650         size_t result_tlv_len = 0, crypto_tlv_len = 0;
 651         int tlv_type, mandatory, tlv_len;
 652
 653         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, in_data, &left);
 654         if (pos == NULL) {
 655                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid EAP-TLV header");
 656                 return;
 657         }
 658
 659         /* Parse TLVs */
 660         wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received TLVs", pos, left);
 661         while (left >= 4) {
 662                 mandatory = !!(pos[0] & 0x80);
 663                 tlv_type = pos[0] & 0x3f;
 664                 tlv_type = (tlv_type << 8) | pos[1];
 665                 tlv_len = ((int) pos[2] << 8) | pos[3];
 666                 pos += 4;
 667                 left -= 4;
 668                 if ((size_t) tlv_len > left) {
 669                         wpa_printf(MSG_DEBUG, "EAP-PEAP: TLV underrun "
 670                                    "(tlv_len=%d left=%lu)", tlv_len,
 671                                    (unsigned long) left);
 672                         eap_peap_state(data, FAILURE);
 673                         return;
 674                 }
 675                 switch (tlv_type) {
 676                 case EAP_TLV_RESULT_TLV:
 677                         result_tlv = pos;
 678                         result_tlv_len = tlv_len;
 679                         break;
 680                 case EAP_TLV_CRYPTO_BINDING_TLV:
 681                         crypto_tlv = pos;
 682                         crypto_tlv_len = tlv_len;
 683                         break;
 684                 default:
 685                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Unsupported TLV Type "
 686                                    "%d%s", tlv_type,
 687                                    mandatory ? " (mandatory)" : "");
 688                         if (mandatory) {
 689                                 eap_peap_state(data, FAILURE);
 690                                 return;
 691                         }
 692                         /* Ignore this TLV, but process other TLVs */
 693                         break;
 694                 }
 695
 696                 pos += tlv_len;
 697                 left -= tlv_len;
 698         }
 699         if (left) {
 700                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Last TLV too short in "
 701                            "Request (left=%lu)", (unsigned long) left);
 702                 eap_peap_state(data, FAILURE);
 703                 return;
 704         }
 705
 706         /* Process supported TLVs */
 707         if (crypto_tlv && data->crypto_binding_sent) {
 708                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
 709                             crypto_tlv, crypto_tlv_len);
 710                 if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
 711                                                    crypto_tlv_len + 4) < 0) {
 712                         eap_peap_state(data, FAILURE);
 713                         return;
 714                 }
 715                 data->crypto_binding_used = 1;
 716         } else if (!crypto_tlv && data->crypto_binding_sent &&
 717                    data->crypto_binding == REQUIRE_BINDING) {
 718                 wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
 719                 eap_peap_state(data, FAILURE);
 720                 return;
 721         }
 722
 723         if (result_tlv) {
 724                 int status;
 725                 const char *requested;
 726
 727                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Result TLV",
 728                             result_tlv, result_tlv_len);
 729                 if (result_tlv_len < 2) {
 730                         wpa_printf(MSG_INFO, "EAP-PEAP: Too short Result TLV "
 731                                    "(len=%lu)",
 732                                    (unsigned long) result_tlv_len);
 733                         eap_peap_state(data, FAILURE);
 734                         return;
 735                 }
 736                 requested = data->tlv_request == TLV_REQ_SUCCESS ? "Success" :
 737                         "Failure";
 738                 status = WPA_GET_BE16(result_tlv);
 739                 if (status == EAP_TLV_RESULT_SUCCESS) {
 740                         wpa_printf(MSG_INFO, "EAP-PEAP: TLV Result - Success "
 741                                    "- requested %s", requested);
 742                         if (data->tlv_request == TLV_REQ_SUCCESS) {
 743                                 eap_peap_state(data, SUCCESS);
 744                                 eap_peap_valid_session(sm, data);
 745                         } else {
 746                                 eap_peap_state(data, FAILURE);
 747                         }
 748
 749                 } else if (status == EAP_TLV_RESULT_FAILURE) {
 750                         wpa_printf(MSG_INFO, "EAP-PEAP: TLV Result - Failure "
 751                                    "- requested %s", requested);
 752                         eap_peap_state(data, FAILURE);
 753                 } else {
 754                         wpa_printf(MSG_INFO, "EAP-PEAP: Unknown TLV Result "
 755                                    "Status %d", status);
 756                         eap_peap_state(data, FAILURE);
 757                 }
 758         }
 759 }
 760
 761
 762 #ifdef EAP_SERVER_TNC
 763 static void eap_peap_process_phase2_soh(struct eap_sm *sm,
 764                                         struct eap_peap_data *data,
 765                                         struct wpabuf *in_data)
 766 {
 767         const u8 *pos, *vpos;
 768         size_t left;
 769         const u8 *soh_tlv = NULL;
 770         size_t soh_tlv_len = 0;
 771         int tlv_type, mandatory, tlv_len, vtlv_len;
 772         u32 next_type;
 773         u32 vendor_id;
 774
 775         pos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21, in_data, &left);
 776         if (pos == NULL) {
 777                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Not a valid SoH EAP "
 778                            "Extensions Method header - skip TNC");
 779                 goto auth_method;
 780         }
 781
 782         /* Parse TLVs */
 783         wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received TLVs (SoH)", pos, left);
 784         while (left >= 4) {
 785                 mandatory = !!(pos[0] & 0x80);
 786                 tlv_type = pos[0] & 0x3f;
 787                 tlv_type = (tlv_type << 8) | pos[1];
 788                 tlv_len = ((int) pos[2] << 8) | pos[3];
 789                 pos += 4;
 790                 left -= 4;
 791                 if ((size_t) tlv_len > left) {
 792                         wpa_printf(MSG_DEBUG, "EAP-PEAP: TLV underrun "
 793                                    "(tlv_len=%d left=%lu)", tlv_len,
 794                                    (unsigned long) left);
 795                         eap_peap_state(data, FAILURE);
 796                         return;
 797                 }
 798                 switch (tlv_type) {
 799                 case EAP_TLV_VENDOR_SPECIFIC_TLV:
 800                         if (tlv_len < 4) {
 801                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Too short "
 802                                            "vendor specific TLV (len=%d)",
 803                                            (int) tlv_len);
 804                                 eap_peap_state(data, FAILURE);
 805                                 return;
 806                         }
 807
 808                         vendor_id = WPA_GET_BE32(pos);
 809                         if (vendor_id != EAP_VENDOR_MICROSOFT) {
 810                                 if (mandatory) {
 811                                         eap_peap_state(data, FAILURE);
 812                                         return;
 813                                 }
 814                                 break;
 815                         }
 816
 817                         vpos = pos + 4;
 818                         mandatory = !!(vpos[0] & 0x80);
 819                         tlv_type = vpos[0] & 0x3f;
 820                         tlv_type = (tlv_type << 8) | vpos[1];
 821                         vtlv_len = ((int) vpos[2] << 8) | vpos[3];
 822                         vpos += 4;
 823                         if (vpos + vtlv_len > pos + left) {
 824                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Vendor TLV "
 825                                            "underrun");
 826                                 eap_peap_state(data, FAILURE);
 827                                 return;
 828                         }
 829
 830                         if (tlv_type == 1) {
 831                                 soh_tlv = vpos;
 832                                 soh_tlv_len = vtlv_len;
 833                                 break;
 834                         }
 835
 836                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Unsupported MS-TLV "
 837                                    "Type %d%s", tlv_type,
 838                                    mandatory ? " (mandatory)" : "");
 839                         if (mandatory) {
 840                                 eap_peap_state(data, FAILURE);
 841                                 return;
 842                         }
 843                         /* Ignore this TLV, but process other TLVs */
 844                         break;
 845                 default:
 846                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Unsupported TLV Type "
 847                                    "%d%s", tlv_type,
 848                                    mandatory ? " (mandatory)" : "");
 849                         if (mandatory) {
 850                                 eap_peap_state(data, FAILURE);
 851                                 return;
 852                         }
 853                         /* Ignore this TLV, but process other TLVs */
 854                         break;
 855                 }
 856
 857                 pos += tlv_len;
 858                 left -= tlv_len;
 859         }
 860         if (left) {
 861                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Last TLV too short in "
 862                            "Request (left=%lu)", (unsigned long) left);
 863                 eap_peap_state(data, FAILURE);
 864                 return;
 865         }
 866
 867         /* Process supported TLVs */
 868         if (soh_tlv) {
 869                 int failure = 0;
 870                 wpabuf_free(data->soh_response);
 871                 data->soh_response = tncs_process_soh(soh_tlv, soh_tlv_len,
 872                                                       &failure);
 873                 if (failure) {
 874                         eap_peap_state(data, FAILURE);
 875                         return;
 876                 }
 877         } else {
 878                 wpa_printf(MSG_DEBUG, "EAP-PEAP: No SoH TLV received");
 879                 eap_peap_state(data, FAILURE);
 880                 return;
 881         }
 882
 883 auth_method:
 884         eap_peap_state(data, PHASE2_METHOD);
 885         next_type = sm->user->methods[0].method;
 886         sm->user_eap_method_index = 1;
 887         wpa_printf(MSG_DEBUG, "EAP-PEAP: try EAP vendor %d type %d",
 888                    sm->user->methods[0].vendor, next_type);
 889         eap_peap_phase2_init(sm, data, sm->user->methods[0].vendor, next_type);
 890 }
 891 #endif /* EAP_SERVER_TNC */
 892
 893
 894 static void eap_peap_process_phase2_response(struct eap_sm *sm,
 895                                              struct eap_peap_data *data,
 896                                              struct wpabuf *in_data)
 897 {
 898         int next_vendor = EAP_VENDOR_IETF;
 899         u32 next_type = EAP_TYPE_NONE;
 900         const struct eap_hdr *hdr;
 901         const u8 *pos;
 902         size_t left;
 903
 904         if (data->state == PHASE2_TLV) {
 905                 eap_peap_process_phase2_tlv(sm, data, in_data);
 906                 return;
 907         }
 908
 909 #ifdef EAP_SERVER_TNC
 910         if (data->state == PHASE2_SOH) {
 911                 eap_peap_process_phase2_soh(sm, data, in_data);
 912                 return;
 913         }
 914 #endif /* EAP_SERVER_TNC */
 915
 916         if (data->phase2_priv == NULL) {
 917                 wpa_printf(MSG_DEBUG, "EAP-PEAP: %s - Phase2 not "
 918                            "initialized?!", __func__);
 919                 return;
 920         }
 921
 922         hdr = wpabuf_head(in_data);
 923         pos = (const u8 *) (hdr + 1);
 924
 925         if (wpabuf_len(in_data) > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
 926                 left = wpabuf_len(in_data) - sizeof(*hdr);
 927                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Phase2 type Nak'ed; "
 928                             "allowed types", pos + 1, left - 1);
 929                 eap_sm_process_nak(sm, pos + 1, left - 1);
 930                 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
 931                     (sm->user->methods[sm->user_eap_method_index].vendor !=
 932                      EAP_VENDOR_IETF ||
 933                      sm->user->methods[sm->user_eap_method_index].method !=
 934                      EAP_TYPE_NONE)) {
 935                         next_vendor = sm->user->methods[
 936                                 sm->user_eap_method_index].vendor;
 937                         next_type = sm->user->methods[
 938                                 sm->user_eap_method_index++].method;
 939                         wpa_printf(MSG_DEBUG,
 940                                    "EAP-PEAP: try EAP vendor %d type 0x%x",
 941                                    next_vendor, next_type);
 942                 } else {
 943                         eap_peap_req_failure(sm, data);
 944                         next_vendor = EAP_VENDOR_IETF;
 945                         next_type = EAP_TYPE_NONE;
 946                 }
 947                 eap_peap_phase2_init(sm, data, next_vendor, next_type);
 948                 return;
 949         }
 950
 951         if (data->phase2_method->check(sm, data->phase2_priv, in_data)) {
 952                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 check() asked to "
 953                            "ignore the packet");
 954                 return;
 955         }
 956
 957         data->phase2_method->process(sm, data->phase2_priv, in_data);
 958
 959         if (sm->method_pending == METHOD_PENDING_WAIT) {
 960                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 method is in "
 961                            "pending wait state - save decrypted response");
 962                 wpabuf_free(data->pending_phase2_resp);
 963                 data->pending_phase2_resp = wpabuf_dup(in_data);
 964         }
 965
 966         if (!data->phase2_method->isDone(sm, data->phase2_priv))
 967                 return;
 968
 969         if (!data->phase2_method->isSuccess(sm, data->phase2_priv)) {
 970                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 method failed");
 971                 eap_peap_req_failure(sm, data);
 972                 next_vendor = EAP_VENDOR_IETF;
 973                 next_type = EAP_TYPE_NONE;
 974                 eap_peap_phase2_init(sm, data, next_vendor, next_type);
 975                 return;
 976         }
 977
 978         os_free(data->phase2_key);
 979         if (data->phase2_method->getKey) {
 980                 data->phase2_key = data->phase2_method->getKey(
 981                         sm, data->phase2_priv, &data->phase2_key_len);
 982                 if (data->phase2_key == NULL) {
 983                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 getKey "
 984                                    "failed");
 985                         eap_peap_req_failure(sm, data);
 986                         eap_peap_phase2_init(sm, data, EAP_VENDOR_IETF,
 987                                              EAP_TYPE_NONE);
 988                         return;
 989                 }
 990         }
 991
 992         switch (data->state) {
 993         case PHASE1_ID2:
 994         case PHASE2_ID:
 995         case PHASE2_SOH:
 996                 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
 997                         wpa_hexdump_ascii(MSG_DEBUG, "EAP_PEAP: Phase2 "
 998                                           "Identity not found in the user "
 999                                           "database",
1000                                           sm->identity, sm->identity_len);
1001                         eap_peap_req_failure(sm, data);
1002                         next_vendor = EAP_VENDOR_IETF;
1003                         next_type = EAP_TYPE_NONE;
1004                         break;
1005                 }
1006
1007 #ifdef EAP_SERVER_TNC
1008                 if (data->state != PHASE2_SOH && sm->tnc &&
1009                     data->peap_version == 0) {
1010                         eap_peap_state(data, PHASE2_SOH);
1011                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Try to initialize "
1012                                    "TNC (NAP SOH)");
1013                         next_vendor = EAP_VENDOR_IETF;
1014                         next_type = EAP_TYPE_NONE;
1015                         break;
1016                 }
1017 #endif /* EAP_SERVER_TNC */
1018
1019                 eap_peap_state(data, PHASE2_METHOD);
1020                 next_vendor = sm->user->methods[0].vendor;
1021                 next_type = sm->user->methods[0].method;
1022                 sm->user_eap_method_index = 1;
1023                 wpa_printf(MSG_DEBUG, "EAP-PEAP: try EAP vendor %d type 0x%x",
1024                            next_vendor, next_type);
1025                 break;
1026         case PHASE2_METHOD:
1027                 eap_peap_req_success(sm, data);
1028                 next_vendor = EAP_VENDOR_IETF;
1029                 next_type = EAP_TYPE_NONE;
1030                 break;
1031         case FAILURE:
1032                 break;
1033         default:
1034                 wpa_printf(MSG_DEBUG, "EAP-PEAP: %s - unexpected state %d",
1035                            __func__, data->state);
1036                 break;
1037         }
1038
1039         eap_peap_phase2_init(sm, data, next_vendor, next_type);
1040 }
1041
1042
1043 static void eap_peap_process_phase2(struct eap_sm *sm,
1044                                     struct eap_peap_data *data,
1045                                     const struct wpabuf *respData,
1046                                     struct wpabuf *in_buf)
1047 {
1048         struct wpabuf *in_decrypted;
1049         const struct eap_hdr *hdr;
1050         size_t len;
1051
1052         wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
1053                    " Phase 2", (unsigned long) wpabuf_len(in_buf));
1054
1055         if (data->pending_phase2_resp) {
1056                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1057                            "skip decryption and use old data");
1058                 eap_peap_process_phase2_response(sm, data,
1059                                                  data->pending_phase2_resp);
1060                 wpabuf_free(data->pending_phase2_resp);
1061                 data->pending_phase2_resp = NULL;
1062                 return;
1063         }
1064
1065         in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1066                                               in_buf);
1067         if (in_decrypted == NULL) {
1068                 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to decrypt Phase 2 "
1069                            "data");
1070                 eap_peap_state(data, FAILURE);
1071                 return;
1072         }
1073
1074         wpa_hexdump_buf_key(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
1075                             in_decrypted);
1076
1077         if (data->peap_version == 0 && data->state != PHASE2_TLV) {
1078                 const struct eap_hdr *resp;
1079                 struct eap_hdr *nhdr;
1080                 struct wpabuf *nbuf =
1081                         wpabuf_alloc(sizeof(struct eap_hdr) +
1082                                      wpabuf_len(in_decrypted));
1083                 if (nbuf == NULL) {
1084                         wpabuf_free(in_decrypted);
1085                         return;
1086                 }
1087
1088                 resp = wpabuf_head(respData);
1089                 nhdr = wpabuf_put(nbuf, sizeof(*nhdr));
1090                 nhdr->code = resp->code;
1091                 nhdr->identifier = resp->identifier;
1092                 nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
1093                                             wpabuf_len(in_decrypted));
1094                 wpabuf_put_buf(nbuf, in_decrypted);
1095                 wpabuf_free(in_decrypted);
1096
1097                 in_decrypted = nbuf;
1098         }
1099
1100         hdr = wpabuf_head(in_decrypted);
1101         if (wpabuf_len(in_decrypted) < (int) sizeof(*hdr)) {
1102                 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
1103                            "EAP frame (len=%lu)",
1104                            (unsigned long) wpabuf_len(in_decrypted));
1105                 wpabuf_free(in_decrypted);
1106                 eap_peap_req_failure(sm, data);
1107                 return;
1108         }
1109         len = be_to_host16(hdr->length);
1110         if (len > wpabuf_len(in_decrypted)) {
1111                 wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
1112                            "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
1113                            (unsigned long) wpabuf_len(in_decrypted),
1114                            (unsigned long) len);
1115                 wpabuf_free(in_decrypted);
1116                 eap_peap_req_failure(sm, data);
1117                 return;
1118         }
1119         wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
1120                    "identifier=%d length=%lu", hdr->code, hdr->identifier,
1121                    (unsigned long) len);
1122         switch (hdr->code) {
1123         case EAP_CODE_RESPONSE:
1124                 eap_peap_process_phase2_response(sm, data, in_decrypted);
1125                 break;
1126         case EAP_CODE_SUCCESS:
1127                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
1128                 if (data->state == SUCCESS_REQ) {
1129                         eap_peap_state(data, SUCCESS);
1130                         eap_peap_valid_session(sm, data);
1131                 }
1132                 break;
1133         case EAP_CODE_FAILURE:
1134                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
1135                 eap_peap_state(data, FAILURE);
1136                 break;
1137         default:
1138                 wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
1139                            "Phase 2 EAP header", hdr->code);
1140                 break;
1141         }
1142
1143         wpabuf_free(in_decrypted);
1144 }
1145
1146
1147 static int eap_peap_process_version(struct eap_sm *sm, void *priv,
1148                                     int peer_version)
1149 {
1150         struct eap_peap_data *data = priv;
1151
1152         data->recv_version = peer_version;
1153         if (data->force_version >= 0 && peer_version != data->force_version) {
1154                 wpa_printf(MSG_INFO, "EAP-PEAP: peer did not select the forced"
1155                            " version (forced=%d peer=%d) - reject",
1156                            data->force_version, peer_version);
1157                 return -1;
1158         }
1159         if (peer_version < data->peap_version) {
1160                 wpa_printf(MSG_DEBUG, "EAP-PEAP: peer ver=%d, own ver=%d; "
1161                            "use version %d",
1162                            peer_version, data->peap_version, peer_version);
1163                 data->peap_version = peer_version;
1164         }
1165
1166         return 0;
1167 }
1168
1169
1170 static void eap_peap_process_msg(struct eap_sm *sm, void *priv,
1171                                  const struct wpabuf *respData)
1172 {
1173         struct eap_peap_data *data = priv;
1174
1175         switch (data->state) {
1176         case PHASE1:
1177                 if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1178                         eap_peap_state(data, FAILURE);
1179                         break;
1180                 }
1181                 break;
1182         case PHASE2_START:
1183                 eap_peap_state(data, PHASE2_ID);
1184                 eap_peap_phase2_init(sm, data, EAP_VENDOR_IETF,
1185                                      EAP_TYPE_IDENTITY);
1186                 break;
1187         case PHASE1_ID2:
1188         case PHASE2_ID:
1189         case PHASE2_METHOD:
1190         case PHASE2_SOH:
1191         case PHASE2_TLV:
1192                 eap_peap_process_phase2(sm, data, respData, data->ssl.tls_in);
1193                 break;
1194         case SUCCESS_REQ:
1195                 eap_peap_state(data, SUCCESS);
1196                 eap_peap_valid_session(sm, data);
1197                 break;
1198         case FAILURE_REQ:
1199                 eap_peap_state(data, FAILURE);
1200                 break;
1201         default:
1202                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected state %d in %s",
1203                            data->state, __func__);
1204                 break;
1205         }
1206 }
1207
1208
1209 static void eap_peap_process(struct eap_sm *sm, void *priv,
1210                              struct wpabuf *respData)
1211 {
1212         struct eap_peap_data *data = priv;
1213         const struct wpabuf *buf;
1214         const u8 *pos;
1215         u8 id_len;
1216
1217         if (eap_server_tls_process(sm, &data->ssl, respData, data,
1218                                    EAP_TYPE_PEAP, eap_peap_process_version,
1219                                    eap_peap_process_msg) < 0) {
1220                 eap_peap_state(data, FAILURE);
1221                 return;
1222         }
1223
1224         if (data->state == SUCCESS ||
1225             !tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
1226             !tls_connection_resumed(sm->ssl_ctx, data->ssl.conn))
1227                 return;
1228
1229         buf = tls_connection_get_success_data(data->ssl.conn);
1230         if (!buf || wpabuf_len(buf) < 2) {
1231                 wpa_printf(MSG_DEBUG,
1232                            "EAP-PEAP: No success data in resumed session - reject attempt");
1233                 eap_peap_state(data, FAILURE);
1234                 return;
1235         }
1236
1237         pos = wpabuf_head(buf);
1238         if (*pos != EAP_TYPE_PEAP) {
1239                 wpa_printf(MSG_DEBUG,
1240                            "EAP-PEAP: Resumed session for another EAP type (%u) - reject attempt",
1241                            *pos);
1242                 eap_peap_state(data, FAILURE);
1243                 return;
1244         }
1245
1246         pos++;
1247         id_len = *pos++;
1248         wpa_hexdump_ascii(MSG_DEBUG, "EAP-PEAP: Identity from cached session",
1249                           pos, id_len);
1250         os_free(sm->identity);
1251         sm->identity = os_malloc(id_len ? id_len : 1);
1252         if (!sm->identity) {
1253                 sm->identity_len = 0;
1254                 eap_peap_state(data, FAILURE);
1255                 return;
1256         }
1257
1258         os_memcpy(sm->identity, pos, id_len);
1259         sm->identity_len = id_len;
1260
1261         if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1262                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-PEAP: Phase2 Identity not found in the user database",
1263                                   sm->identity, sm->identity_len);
1264                 eap_peap_state(data, FAILURE);
1265                 return;
1266         }
1267
1268         wpa_printf(MSG_DEBUG,
1269                    "EAP-PEAP: Resuming previous session - skip Phase2");
1270         eap_peap_state(data, SUCCESS_REQ);
1271         tls_connection_set_success_data_resumed(data->ssl.conn);
1272 }
1273
1274
1275 static Boolean eap_peap_isDone(struct eap_sm *sm, void *priv)
1276 {
1277         struct eap_peap_data *data = priv;
1278         return data->state == SUCCESS || data->state == FAILURE;
1279 }
1280
1281
1282 static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
1283 {
1284         struct eap_peap_data *data = priv;
1285         u8 *eapKeyData;
1286
1287         if (data->state != SUCCESS)
1288                 return NULL;
1289
1290         if (data->crypto_binding_used) {
1291                 u8 csk[128];
1292                 /*
1293                  * Note: It looks like Microsoft implementation requires null
1294                  * termination for this label while the one used for deriving
1295                  * IPMK|CMK did not use null termination.
1296                  */
1297                 if (peap_prfplus(data->peap_version, data->ipmk, 40,
1298                                  "Session Key Generating Function",
1299                                  (u8 *) "\00", 1, csk, sizeof(csk)) < 0)
1300                         return NULL;
1301                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
1302                 eapKeyData = os_malloc(EAP_TLS_KEY_LEN);
1303                 if (eapKeyData) {
1304                         os_memcpy(eapKeyData, csk, EAP_TLS_KEY_LEN);
1305                         *len = EAP_TLS_KEY_LEN;
1306                         wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1307                                     eapKeyData, EAP_TLS_KEY_LEN);
1308                 } else {
1309                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to derive "
1310                                    "key");
1311                 }
1312
1313                 return eapKeyData;
1314         }
1315
1316         /* TODO: PEAPv1 - different label in some cases */
1317         eapKeyData = eap_server_tls_derive_key(sm, &data->ssl,
1318                                                "client EAP encryption",
1319                                                EAP_TLS_KEY_LEN);
1320         if (eapKeyData) {
1321                 *len = EAP_TLS_KEY_LEN;
1322                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1323                             eapKeyData, EAP_TLS_KEY_LEN);
1324         } else {
1325                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to derive key");
1326         }
1327
1328         return eapKeyData;
1329 }
1330
1331
1332 static Boolean eap_peap_isSuccess(struct eap_sm *sm, void *priv)
1333 {
1334         struct eap_peap_data *data = priv;
1335         return data->state == SUCCESS;
1336 }
1337
1338
1339 static u8 * eap_peap_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1340 {
1341         struct eap_peap_data *data = priv;
1342
1343         if (data->state != SUCCESS)
1344                 return NULL;
1345
1346         return eap_server_tls_derive_session_id(sm, &data->ssl, EAP_TYPE_PEAP,
1347                                                 len);
1348 }
1349
1350
1351 int eap_server_peap_register(void)
1352 {
1353         struct eap_method *eap;
1354         int ret;
1355
1356         eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1357                                       EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
1358         if (eap == NULL)
1359                 return -1;
1360
1361         eap->init = eap_peap_init;
1362         eap->reset = eap_peap_reset;
1363         eap->buildReq = eap_peap_buildReq;
1364         eap->check = eap_peap_check;
1365         eap->process = eap_peap_process;
1366         eap->isDone = eap_peap_isDone;
1367         eap->getKey = eap_peap_getKey;
1368         eap->isSuccess = eap_peap_isSuccess;
1369         eap->getSessionId = eap_peap_get_session_id;
1370
1371         ret = eap_server_method_register(eap);
1372         if (ret)
1373                 eap_server_method_free(eap);
1374         return ret;
1375 }