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         if (tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
 339                 /* Fast-connect: IPMK|CMK = TK */
 340                 os_memcpy(data->ipmk, tk, 40);
 341                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK from TK",
 342                                 data->ipmk, 40);
 343                 os_memcpy(data->cmk, tk + 40, 20);
 344                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK from TK",
 345                                 data->cmk, 20);
 346                 os_free(tk);
 347                 return 0;
 348         }
 349
 350         eap_peap_get_isk(data, isk, sizeof(isk));
 351         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk));
 352
 353         /*
 354          * IPMK Seed = "Inner Methods Compound Keys" | ISK
 355          * TempKey = First 40 octets of TK
 356          * IPMK|CMK = PRF+(TempKey, IPMK Seed, 60)
 357          * (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space
 358          * in the end of the label just before ISK; is that just a typo?)
 359          */
 360         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40);
 361         if (peap_prfplus(data->peap_version, tk, 40,
 362                          "Inner Methods Compound Keys",
 363                          isk, sizeof(isk), imck, sizeof(imck)) < 0) {
 364                 os_free(tk);
 365                 return -1;
 366         }
 367         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
 368                         imck, sizeof(imck));
 369
 370         os_free(tk);
 371
 372         os_memcpy(data->ipmk, imck, 40);
 373         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
 374         os_memcpy(data->cmk, imck + 40, 20);
 375         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);
 376
 377         return 0;
 378 }
 379
 380
 381 static struct wpabuf * eap_peap_build_phase2_tlv(struct eap_sm *sm,
 382                                                  struct eap_peap_data *data,
 383                                                  u8 id)
 384 {
 385         struct wpabuf *buf, *encr_req;
 386         size_t mlen;
 387
 388         mlen = 6; /* Result TLV */
 389         if (data->peap_version == 0 && data->tlv_request == TLV_REQ_SUCCESS &&
 390             data->crypto_binding != NO_BINDING) {
 391                 mlen += 60; /* Cryptobinding TLV */
 392 #ifdef EAP_SERVER_TNC
 393                 if (data->soh_response)
 394                         mlen += wpabuf_len(data->soh_response);
 395 #endif /* EAP_SERVER_TNC */
 396         }
 397
 398         buf = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, mlen,
 399                             EAP_CODE_REQUEST, id);
 400         if (buf == NULL)
 401                 return NULL;
 402
 403         wpabuf_put_u8(buf, 0x80); /* Mandatory */
 404         wpabuf_put_u8(buf, EAP_TLV_RESULT_TLV);
 405         /* Length */
 406         wpabuf_put_be16(buf, 2);
 407         /* Status */
 408         wpabuf_put_be16(buf, data->tlv_request == TLV_REQ_SUCCESS ?
 409                         EAP_TLV_RESULT_SUCCESS : EAP_TLV_RESULT_FAILURE);
 410
 411         if (data->peap_version == 0 && data->tlv_request == TLV_REQ_SUCCESS &&
 412             data->crypto_binding != NO_BINDING) {
 413                 u8 *mac;
 414                 u8 eap_type = EAP_TYPE_PEAP;
 415                 const u8 *addr[2];
 416                 size_t len[2];
 417                 u16 tlv_type;
 418
 419 #ifdef EAP_SERVER_TNC
 420                 if (data->soh_response) {
 421                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Adding MS-SOH "
 422                                    "Response TLV");
 423                         wpabuf_put_buf(buf, data->soh_response);
 424                         wpabuf_free(data->soh_response);
 425                         data->soh_response = NULL;
 426                 }
 427 #endif /* EAP_SERVER_TNC */
 428
 429                 if (eap_peap_derive_cmk(sm, data) < 0 ||
 430                     random_get_bytes(data->binding_nonce, 32)) {
 431                         wpabuf_free(buf);
 432                         return NULL;
 433                 }
 434
 435                 /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
 436                 addr[0] = wpabuf_put(buf, 0);
 437                 len[0] = 60;
 438                 addr[1] = &eap_type;
 439                 len[1] = 1;
 440
 441                 tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
 442                 wpabuf_put_be16(buf, tlv_type);
 443                 wpabuf_put_be16(buf, 56);
 444
 445                 wpabuf_put_u8(buf, 0); /* Reserved */
 446                 wpabuf_put_u8(buf, data->peap_version); /* Version */
 447                 wpabuf_put_u8(buf, data->recv_version); /* RecvVersion */
 448                 wpabuf_put_u8(buf, 0); /* SubType: 0 = Request, 1 = Response */
 449                 wpabuf_put_data(buf, data->binding_nonce, 32); /* Nonce */
 450                 mac = wpabuf_put(buf, 20); /* Compound_MAC */
 451                 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK",
 452                             data->cmk, 20);
 453                 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
 454                             addr[0], len[0]);
 455                 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
 456                             addr[1], len[1]);
 457                 hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac);
 458                 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC",
 459                             mac, SHA1_MAC_LEN);
 460                 data->crypto_binding_sent = 1;
 461         }
 462
 463         wpa_hexdump_buf_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 TLV data",
 464                             buf);
 465
 466         encr_req = eap_server_tls_encrypt(sm, &data->ssl, buf);
 467         wpabuf_free(buf);
 468
 469         return encr_req;
 470 }
 471
 472
 473 static struct wpabuf * eap_peap_build_phase2_term(struct eap_sm *sm,
 474                                                   struct eap_peap_data *data,
 475                                                   u8 id, int success)
 476 {
 477         struct wpabuf *encr_req, msgbuf;
 478         size_t req_len;
 479         struct eap_hdr *hdr;
 480
 481         req_len = sizeof(*hdr);
 482         hdr = os_zalloc(req_len);
 483         if (hdr == NULL)
 484                 return NULL;
 485
 486         hdr->code = success ? EAP_CODE_SUCCESS : EAP_CODE_FAILURE;
 487         hdr->identifier = id;
 488         hdr->length = host_to_be16(req_len);
 489
 490         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 data",
 491                         (u8 *) hdr, req_len);
 492
 493         wpabuf_set(&msgbuf, hdr, req_len);
 494         encr_req = eap_server_tls_encrypt(sm, &data->ssl, &msgbuf);
 495         os_free(hdr);
 496
 497         return encr_req;
 498 }
 499
 500
 501 static struct wpabuf * eap_peap_buildReq(struct eap_sm *sm, void *priv, u8 id)
 502 {
 503         struct eap_peap_data *data = priv;
 504
 505         if (data->ssl.state == FRAG_ACK) {
 506                 return eap_server_tls_build_ack(id, EAP_TYPE_PEAP,
 507                                                 data->peap_version);
 508         }
 509
 510         if (data->ssl.state == WAIT_FRAG_ACK) {
 511                 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_PEAP,
 512                                                 data->peap_version, id);
 513         }
 514
 515         switch (data->state) {
 516         case START:
 517                 return eap_peap_build_start(sm, data, id);
 518         case PHASE1:
 519         case PHASE1_ID2:
 520                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
 521                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase1 done, "
 522                                    "starting Phase2");
 523                         eap_peap_state(data, PHASE2_START);
 524                 }
 525                 break;
 526         case PHASE2_ID:
 527         case PHASE2_METHOD:
 528                 wpabuf_free(data->ssl.tls_out);
 529                 data->ssl.tls_out_pos = 0;
 530                 data->ssl.tls_out = eap_peap_build_phase2_req(sm, data, id);
 531                 break;
 532 #ifdef EAP_SERVER_TNC
 533         case PHASE2_SOH:
 534                 wpabuf_free(data->ssl.tls_out);
 535                 data->ssl.tls_out_pos = 0;
 536                 data->ssl.tls_out = eap_peap_build_phase2_soh(sm, data, id);
 537                 break;
 538 #endif /* EAP_SERVER_TNC */
 539         case PHASE2_TLV:
 540                 wpabuf_free(data->ssl.tls_out);
 541                 data->ssl.tls_out_pos = 0;
 542                 data->ssl.tls_out = eap_peap_build_phase2_tlv(sm, data, id);
 543                 break;
 544         case SUCCESS_REQ:
 545                 wpabuf_free(data->ssl.tls_out);
 546                 data->ssl.tls_out_pos = 0;
 547                 data->ssl.tls_out = eap_peap_build_phase2_term(sm, data, id,
 548                                                                1);
 549                 break;
 550         case FAILURE_REQ:
 551                 wpabuf_free(data->ssl.tls_out);
 552                 data->ssl.tls_out_pos = 0;
 553                 data->ssl.tls_out = eap_peap_build_phase2_term(sm, data, id,
 554                                                                0);
 555                 break;
 556         default:
 557                 wpa_printf(MSG_DEBUG, "EAP-PEAP: %s - unexpected state %d",
 558                            __func__, data->state);
 559                 return NULL;
 560         }
 561
 562         return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_PEAP,
 563                                         data->peap_version, id);
 564 }
 565
 566
 567 static Boolean eap_peap_check(struct eap_sm *sm, void *priv,
 568                               struct wpabuf *respData)
 569 {
 570         const u8 *pos;
 571         size_t len;
 572
 573         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PEAP, respData, &len);
 574         if (pos == NULL || len < 1) {
 575                 wpa_printf(MSG_INFO, "EAP-PEAP: Invalid frame");
 576                 return TRUE;
 577         }
 578
 579         return FALSE;
 580 }
 581
 582
 583 static int eap_peap_phase2_init(struct eap_sm *sm, struct eap_peap_data *data,
 584                                 int vendor, EapType eap_type)
 585 {
 586         if (data->phase2_priv && data->phase2_method) {
 587                 data->phase2_method->reset(sm, data->phase2_priv);
 588                 data->phase2_method = NULL;
 589                 data->phase2_priv = NULL;
 590         }
 591         data->phase2_method = eap_server_get_eap_method(vendor, eap_type);
 592         if (!data->phase2_method)
 593                 return -1;
 594
 595         sm->init_phase2 = 1;
 596         data->phase2_priv = data->phase2_method->init(sm);
 597         sm->init_phase2 = 0;
 598         return 0;
 599 }
 600
 601
 602 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
 603                                           struct eap_peap_data *data,
 604                                           const u8 *crypto_tlv,
 605                                           size_t crypto_tlv_len)
 606 {
 607         u8 buf[61], mac[SHA1_MAC_LEN];
 608         const u8 *pos;
 609
 610         if (crypto_tlv_len != 4 + 56) {
 611                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
 612                            "length %d", (int) crypto_tlv_len);
 613                 return -1;
 614         }
 615
 616         pos = crypto_tlv;
 617         pos += 4; /* TLV header */
 618         if (pos[1] != data->peap_version) {
 619                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
 620                            "mismatch (was %d; expected %d)",
 621                            pos[1], data->peap_version);
 622                 return -1;
 623         }
 624
 625         if (pos[3] != 1) {
 626                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
 627                            "SubType %d", pos[3]);
 628                 return -1;
 629         }
 630         pos += 4;
 631         pos += 32; /* Nonce */
 632
 633         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
 634         os_memcpy(buf, crypto_tlv, 60);
 635         os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
 636         buf[60] = EAP_TYPE_PEAP;
 637         hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
 638
 639         if (os_memcmp_const(mac, pos, SHA1_MAC_LEN) != 0) {
 640                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
 641                            "cryptobinding TLV");
 642                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK", data->cmk, 20);
 643                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding seed data",
 644                             buf, 61);
 645                 return -1;
 646         }
 647
 648         wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
 649
 650         return 0;
 651 }
 652
 653
 654 static void eap_peap_process_phase2_tlv(struct eap_sm *sm,
 655                                         struct eap_peap_data *data,
 656                                         struct wpabuf *in_data)
 657 {
 658         const u8 *pos;
 659         size_t left;
 660         const u8 *result_tlv = NULL, *crypto_tlv = NULL;
 661         size_t result_tlv_len = 0, crypto_tlv_len = 0;
 662         int tlv_type, mandatory, tlv_len;
 663
 664         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, in_data, &left);
 665         if (pos == NULL) {
 666                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid EAP-TLV header");
 667                 return;
 668         }
 669
 670         /* Parse TLVs */
 671         wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received TLVs", pos, left);
 672         while (left >= 4) {
 673                 mandatory = !!(pos[0] & 0x80);
 674                 tlv_type = pos[0] & 0x3f;
 675                 tlv_type = (tlv_type << 8) | pos[1];
 676                 tlv_len = ((int) pos[2] << 8) | pos[3];
 677                 pos += 4;
 678                 left -= 4;
 679                 if ((size_t) tlv_len > left) {
 680                         wpa_printf(MSG_DEBUG, "EAP-PEAP: TLV underrun "
 681                                    "(tlv_len=%d left=%lu)", tlv_len,
 682                                    (unsigned long) left);
 683                         eap_peap_state(data, FAILURE);
 684                         return;
 685                 }
 686                 switch (tlv_type) {
 687                 case EAP_TLV_RESULT_TLV:
 688                         result_tlv = pos;
 689                         result_tlv_len = tlv_len;
 690                         break;
 691                 case EAP_TLV_CRYPTO_BINDING_TLV:
 692                         crypto_tlv = pos;
 693                         crypto_tlv_len = tlv_len;
 694                         break;
 695                 default:
 696                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Unsupported TLV Type "
 697                                    "%d%s", tlv_type,
 698                                    mandatory ? " (mandatory)" : "");
 699                         if (mandatory) {
 700                                 eap_peap_state(data, FAILURE);
 701                                 return;
 702                         }
 703                         /* Ignore this TLV, but process other TLVs */
 704                         break;
 705                 }
 706
 707                 pos += tlv_len;
 708                 left -= tlv_len;
 709         }
 710         if (left) {
 711                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Last TLV too short in "
 712                            "Request (left=%lu)", (unsigned long) left);
 713                 eap_peap_state(data, FAILURE);
 714                 return;
 715         }
 716
 717         /* Process supported TLVs */
 718         if (crypto_tlv && data->crypto_binding_sent) {
 719                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
 720                             crypto_tlv, crypto_tlv_len);
 721                 if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
 722                                                    crypto_tlv_len + 4) < 0) {
 723                         eap_peap_state(data, FAILURE);
 724                         return;
 725                 }
 726                 data->crypto_binding_used = 1;
 727         } else if (!crypto_tlv && data->crypto_binding_sent &&
 728                    data->crypto_binding == REQUIRE_BINDING) {
 729                 wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
 730                 eap_peap_state(data, FAILURE);
 731                 return;
 732         }
 733
 734         if (result_tlv) {
 735                 int status;
 736                 const char *requested;
 737
 738                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Result TLV",
 739                             result_tlv, result_tlv_len);
 740                 if (result_tlv_len < 2) {
 741                         wpa_printf(MSG_INFO, "EAP-PEAP: Too short Result TLV "
 742                                    "(len=%lu)",
 743                                    (unsigned long) result_tlv_len);
 744                         eap_peap_state(data, FAILURE);
 745                         return;
 746                 }
 747                 requested = data->tlv_request == TLV_REQ_SUCCESS ? "Success" :
 748                         "Failure";
 749                 status = WPA_GET_BE16(result_tlv);
 750                 if (status == EAP_TLV_RESULT_SUCCESS) {
 751                         wpa_printf(MSG_INFO, "EAP-PEAP: TLV Result - Success "
 752                                    "- requested %s", requested);
 753                         if (data->tlv_request == TLV_REQ_SUCCESS) {
 754                                 eap_peap_state(data, SUCCESS);
 755                                 eap_peap_valid_session(sm, data);
 756                         } else {
 757                                 eap_peap_state(data, FAILURE);
 758                         }
 759
 760                 } else if (status == EAP_TLV_RESULT_FAILURE) {
 761                         wpa_printf(MSG_INFO, "EAP-PEAP: TLV Result - Failure "
 762                                    "- requested %s", requested);
 763                         eap_peap_state(data, FAILURE);
 764                 } else {
 765                         wpa_printf(MSG_INFO, "EAP-PEAP: Unknown TLV Result "
 766                                    "Status %d", status);
 767                         eap_peap_state(data, FAILURE);
 768                 }
 769         }
 770 }
 771
 772
 773 #ifdef EAP_SERVER_TNC
 774 static void eap_peap_process_phase2_soh(struct eap_sm *sm,
 775                                         struct eap_peap_data *data,
 776                                         struct wpabuf *in_data)
 777 {
 778         const u8 *pos, *vpos;
 779         size_t left;
 780         const u8 *soh_tlv = NULL;
 781         size_t soh_tlv_len = 0;
 782         int tlv_type, mandatory, tlv_len, vtlv_len;
 783         u32 next_type;
 784         u32 vendor_id;
 785
 786         pos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21, in_data, &left);
 787         if (pos == NULL) {
 788                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Not a valid SoH EAP "
 789                            "Extensions Method header - skip TNC");
 790                 goto auth_method;
 791         }
 792
 793         /* Parse TLVs */
 794         wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received TLVs (SoH)", pos, left);
 795         while (left >= 4) {
 796                 mandatory = !!(pos[0] & 0x80);
 797                 tlv_type = pos[0] & 0x3f;
 798                 tlv_type = (tlv_type << 8) | pos[1];
 799                 tlv_len = ((int) pos[2] << 8) | pos[3];
 800                 pos += 4;
 801                 left -= 4;
 802                 if ((size_t) tlv_len > left) {
 803                         wpa_printf(MSG_DEBUG, "EAP-PEAP: TLV underrun "
 804                                    "(tlv_len=%d left=%lu)", tlv_len,
 805                                    (unsigned long) left);
 806                         eap_peap_state(data, FAILURE);
 807                         return;
 808                 }
 809                 switch (tlv_type) {
 810                 case EAP_TLV_VENDOR_SPECIFIC_TLV:
 811                         if (tlv_len < 4) {
 812                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Too short "
 813                                            "vendor specific TLV (len=%d)",
 814                                            (int) tlv_len);
 815                                 eap_peap_state(data, FAILURE);
 816                                 return;
 817                         }
 818
 819                         vendor_id = WPA_GET_BE32(pos);
 820                         if (vendor_id != EAP_VENDOR_MICROSOFT) {
 821                                 if (mandatory) {
 822                                         eap_peap_state(data, FAILURE);
 823                                         return;
 824                                 }
 825                                 break;
 826                         }
 827
 828                         vpos = pos + 4;
 829                         mandatory = !!(vpos[0] & 0x80);
 830                         tlv_type = vpos[0] & 0x3f;
 831                         tlv_type = (tlv_type << 8) | vpos[1];
 832                         vtlv_len = ((int) vpos[2] << 8) | vpos[3];
 833                         vpos += 4;
 834                         if (vpos + vtlv_len > pos + left) {
 835                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Vendor TLV "
 836                                            "underrun");
 837                                 eap_peap_state(data, FAILURE);
 838                                 return;
 839                         }
 840
 841                         if (tlv_type == 1) {
 842                                 soh_tlv = vpos;
 843                                 soh_tlv_len = vtlv_len;
 844                                 break;
 845                         }
 846
 847                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Unsupported MS-TLV "
 848                                    "Type %d%s", tlv_type,
 849                                    mandatory ? " (mandatory)" : "");
 850                         if (mandatory) {
 851                                 eap_peap_state(data, FAILURE);
 852                                 return;
 853                         }
 854                         /* Ignore this TLV, but process other TLVs */
 855                         break;
 856                 default:
 857                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Unsupported TLV Type "
 858                                    "%d%s", tlv_type,
 859                                    mandatory ? " (mandatory)" : "");
 860                         if (mandatory) {
 861                                 eap_peap_state(data, FAILURE);
 862                                 return;
 863                         }
 864                         /* Ignore this TLV, but process other TLVs */
 865                         break;
 866                 }
 867
 868                 pos += tlv_len;
 869                 left -= tlv_len;
 870         }
 871         if (left) {
 872                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Last TLV too short in "
 873                            "Request (left=%lu)", (unsigned long) left);
 874                 eap_peap_state(data, FAILURE);
 875                 return;
 876         }
 877
 878         /* Process supported TLVs */
 879         if (soh_tlv) {
 880                 int failure = 0;
 881                 wpabuf_free(data->soh_response);
 882                 data->soh_response = tncs_process_soh(soh_tlv, soh_tlv_len,
 883                                                       &failure);
 884                 if (failure) {
 885                         eap_peap_state(data, FAILURE);
 886                         return;
 887                 }
 888         } else {
 889                 wpa_printf(MSG_DEBUG, "EAP-PEAP: No SoH TLV received");
 890                 eap_peap_state(data, FAILURE);
 891                 return;
 892         }
 893
 894 auth_method:
 895         eap_peap_state(data, PHASE2_METHOD);
 896         next_type = sm->user->methods[0].method;
 897         sm->user_eap_method_index = 1;
 898         wpa_printf(MSG_DEBUG, "EAP-PEAP: try EAP vendor %d type %d",
 899                    sm->user->methods[0].vendor, next_type);
 900         eap_peap_phase2_init(sm, data, sm->user->methods[0].vendor, next_type);
 901 }
 902 #endif /* EAP_SERVER_TNC */
 903
 904
 905 static void eap_peap_process_phase2_response(struct eap_sm *sm,
 906                                              struct eap_peap_data *data,
 907                                              struct wpabuf *in_data)
 908 {
 909         int next_vendor = EAP_VENDOR_IETF;
 910         u32 next_type = EAP_TYPE_NONE;
 911         const struct eap_hdr *hdr;
 912         const u8 *pos;
 913         size_t left;
 914
 915         if (data->state == PHASE2_TLV) {
 916                 eap_peap_process_phase2_tlv(sm, data, in_data);
 917                 return;
 918         }
 919
 920 #ifdef EAP_SERVER_TNC
 921         if (data->state == PHASE2_SOH) {
 922                 eap_peap_process_phase2_soh(sm, data, in_data);
 923                 return;
 924         }
 925 #endif /* EAP_SERVER_TNC */
 926
 927         if (data->phase2_priv == NULL) {
 928                 wpa_printf(MSG_DEBUG, "EAP-PEAP: %s - Phase2 not "
 929                            "initialized?!", __func__);
 930                 return;
 931         }
 932
 933         hdr = wpabuf_head(in_data);
 934         pos = (const u8 *) (hdr + 1);
 935
 936         if (wpabuf_len(in_data) > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
 937                 left = wpabuf_len(in_data) - sizeof(*hdr);
 938                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Phase2 type Nak'ed; "
 939                             "allowed types", pos + 1, left - 1);
 940                 eap_sm_process_nak(sm, pos + 1, left - 1);
 941                 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
 942                     (sm->user->methods[sm->user_eap_method_index].vendor !=
 943                      EAP_VENDOR_IETF ||
 944                      sm->user->methods[sm->user_eap_method_index].method !=
 945                      EAP_TYPE_NONE)) {
 946                         next_vendor = sm->user->methods[
 947                                 sm->user_eap_method_index].vendor;
 948                         next_type = sm->user->methods[
 949                                 sm->user_eap_method_index++].method;
 950                         wpa_printf(MSG_DEBUG,
 951                                    "EAP-PEAP: try EAP vendor %d type 0x%x",
 952                                    next_vendor, next_type);
 953                 } else {
 954                         eap_peap_req_failure(sm, data);
 955                         next_vendor = EAP_VENDOR_IETF;
 956                         next_type = EAP_TYPE_NONE;
 957                 }
 958                 eap_peap_phase2_init(sm, data, next_vendor, next_type);
 959                 return;
 960         }
 961
 962         if (data->phase2_method->check(sm, data->phase2_priv, in_data)) {
 963                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 check() asked to "
 964                            "ignore the packet");
 965                 return;
 966         }
 967
 968         data->phase2_method->process(sm, data->phase2_priv, in_data);
 969
 970         if (sm->method_pending == METHOD_PENDING_WAIT) {
 971                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 method is in "
 972                            "pending wait state - save decrypted response");
 973                 wpabuf_free(data->pending_phase2_resp);
 974                 data->pending_phase2_resp = wpabuf_dup(in_data);
 975         }
 976
 977         if (!data->phase2_method->isDone(sm, data->phase2_priv))
 978                 return;
 979
 980         if (!data->phase2_method->isSuccess(sm, data->phase2_priv)) {
 981                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 method failed");
 982                 eap_peap_req_failure(sm, data);
 983                 next_vendor = EAP_VENDOR_IETF;
 984                 next_type = EAP_TYPE_NONE;
 985                 eap_peap_phase2_init(sm, data, next_vendor, next_type);
 986                 return;
 987         }
 988
 989         os_free(data->phase2_key);
 990         if (data->phase2_method->getKey) {
 991                 data->phase2_key = data->phase2_method->getKey(
 992                         sm, data->phase2_priv, &data->phase2_key_len);
 993                 if (data->phase2_key == NULL) {
 994                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 getKey "
 995                                    "failed");
 996                         eap_peap_req_failure(sm, data);
 997                         eap_peap_phase2_init(sm, data, EAP_VENDOR_IETF,
 998                                              EAP_TYPE_NONE);
 999                         return;
1000                 }
1001         }
1002
1003         switch (data->state) {
1004         case PHASE1_ID2:
1005         case PHASE2_ID:
1006         case PHASE2_SOH:
1007                 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1008                         wpa_hexdump_ascii(MSG_DEBUG, "EAP_PEAP: Phase2 "
1009                                           "Identity not found in the user "
1010                                           "database",
1011                                           sm->identity, sm->identity_len);
1012                         eap_peap_req_failure(sm, data);
1013                         next_vendor = EAP_VENDOR_IETF;
1014                         next_type = EAP_TYPE_NONE;
1015                         break;
1016                 }
1017
1018 #ifdef EAP_SERVER_TNC
1019                 if (data->state != PHASE2_SOH && sm->tnc &&
1020                     data->peap_version == 0) {
1021                         eap_peap_state(data, PHASE2_SOH);
1022                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Try to initialize "
1023                                    "TNC (NAP SOH)");
1024                         next_vendor = EAP_VENDOR_IETF;
1025                         next_type = EAP_TYPE_NONE;
1026                         break;
1027                 }
1028 #endif /* EAP_SERVER_TNC */
1029
1030                 eap_peap_state(data, PHASE2_METHOD);
1031                 next_vendor = sm->user->methods[0].vendor;
1032                 next_type = sm->user->methods[0].method;
1033                 sm->user_eap_method_index = 1;
1034                 wpa_printf(MSG_DEBUG, "EAP-PEAP: try EAP vendor %d type 0x%x",
1035                            next_vendor, next_type);
1036                 break;
1037         case PHASE2_METHOD:
1038                 eap_peap_req_success(sm, data);
1039                 next_vendor = EAP_VENDOR_IETF;
1040                 next_type = EAP_TYPE_NONE;
1041                 break;
1042         case FAILURE:
1043                 break;
1044         default:
1045                 wpa_printf(MSG_DEBUG, "EAP-PEAP: %s - unexpected state %d",
1046                            __func__, data->state);
1047                 break;
1048         }
1049
1050         eap_peap_phase2_init(sm, data, next_vendor, next_type);
1051 }
1052
1053
1054 static void eap_peap_process_phase2(struct eap_sm *sm,
1055                                     struct eap_peap_data *data,
1056                                     const struct wpabuf *respData,
1057                                     struct wpabuf *in_buf)
1058 {
1059         struct wpabuf *in_decrypted;
1060         const struct eap_hdr *hdr;
1061         size_t len;
1062
1063         wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
1064                    " Phase 2", (unsigned long) wpabuf_len(in_buf));
1065
1066         if (data->pending_phase2_resp) {
1067                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1068                            "skip decryption and use old data");
1069                 eap_peap_process_phase2_response(sm, data,
1070                                                  data->pending_phase2_resp);
1071                 wpabuf_free(data->pending_phase2_resp);
1072                 data->pending_phase2_resp = NULL;
1073                 return;
1074         }
1075
1076         in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1077                                               in_buf);
1078         if (in_decrypted == NULL) {
1079                 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to decrypt Phase 2 "
1080                            "data");
1081                 eap_peap_state(data, FAILURE);
1082                 return;
1083         }
1084
1085         wpa_hexdump_buf_key(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
1086                             in_decrypted);
1087
1088         if (data->peap_version == 0 && data->state != PHASE2_TLV) {
1089                 const struct eap_hdr *resp;
1090                 struct eap_hdr *nhdr;
1091                 struct wpabuf *nbuf =
1092                         wpabuf_alloc(sizeof(struct eap_hdr) +
1093                                      wpabuf_len(in_decrypted));
1094                 if (nbuf == NULL) {
1095                         wpabuf_free(in_decrypted);
1096                         return;
1097                 }
1098
1099                 resp = wpabuf_head(respData);
1100                 nhdr = wpabuf_put(nbuf, sizeof(*nhdr));
1101                 nhdr->code = resp->code;
1102                 nhdr->identifier = resp->identifier;
1103                 nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
1104                                             wpabuf_len(in_decrypted));
1105                 wpabuf_put_buf(nbuf, in_decrypted);
1106                 wpabuf_free(in_decrypted);
1107
1108                 in_decrypted = nbuf;
1109         }
1110
1111         hdr = wpabuf_head(in_decrypted);
1112         if (wpabuf_len(in_decrypted) < (int) sizeof(*hdr)) {
1113                 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
1114                            "EAP frame (len=%lu)",
1115                            (unsigned long) wpabuf_len(in_decrypted));
1116                 wpabuf_free(in_decrypted);
1117                 eap_peap_req_failure(sm, data);
1118                 return;
1119         }
1120         len = be_to_host16(hdr->length);
1121         if (len > wpabuf_len(in_decrypted)) {
1122                 wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
1123                            "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
1124                            (unsigned long) wpabuf_len(in_decrypted),
1125                            (unsigned long) len);
1126                 wpabuf_free(in_decrypted);
1127                 eap_peap_req_failure(sm, data);
1128                 return;
1129         }
1130         wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
1131                    "identifier=%d length=%lu", hdr->code, hdr->identifier,
1132                    (unsigned long) len);
1133         switch (hdr->code) {
1134         case EAP_CODE_RESPONSE:
1135                 eap_peap_process_phase2_response(sm, data, in_decrypted);
1136                 break;
1137         case EAP_CODE_SUCCESS:
1138                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
1139                 if (data->state == SUCCESS_REQ) {
1140                         eap_peap_state(data, SUCCESS);
1141                         eap_peap_valid_session(sm, data);
1142                 }
1143                 break;
1144         case EAP_CODE_FAILURE:
1145                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
1146                 eap_peap_state(data, FAILURE);
1147                 break;
1148         default:
1149                 wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
1150                            "Phase 2 EAP header", hdr->code);
1151                 break;
1152         }
1153
1154         wpabuf_free(in_decrypted);
1155 }
1156
1157
1158 static int eap_peap_process_version(struct eap_sm *sm, void *priv,
1159                                     int peer_version)
1160 {
1161         struct eap_peap_data *data = priv;
1162
1163         data->recv_version = peer_version;
1164         if (data->force_version >= 0 && peer_version != data->force_version) {
1165                 wpa_printf(MSG_INFO, "EAP-PEAP: peer did not select the forced"
1166                            " version (forced=%d peer=%d) - reject",
1167                            data->force_version, peer_version);
1168                 return -1;
1169         }
1170         if (peer_version < data->peap_version) {
1171                 wpa_printf(MSG_DEBUG, "EAP-PEAP: peer ver=%d, own ver=%d; "
1172                            "use version %d",
1173                            peer_version, data->peap_version, peer_version);
1174                 data->peap_version = peer_version;
1175         }
1176
1177         return 0;
1178 }
1179
1180
1181 static void eap_peap_process_msg(struct eap_sm *sm, void *priv,
1182                                  const struct wpabuf *respData)
1183 {
1184         struct eap_peap_data *data = priv;
1185
1186         switch (data->state) {
1187         case PHASE1:
1188                 if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1189                         eap_peap_state(data, FAILURE);
1190                         break;
1191                 }
1192                 break;
1193         case PHASE2_START:
1194                 eap_peap_state(data, PHASE2_ID);
1195                 eap_peap_phase2_init(sm, data, EAP_VENDOR_IETF,
1196                                      EAP_TYPE_IDENTITY);
1197                 break;
1198         case PHASE1_ID2:
1199         case PHASE2_ID:
1200         case PHASE2_METHOD:
1201         case PHASE2_SOH:
1202         case PHASE2_TLV:
1203                 eap_peap_process_phase2(sm, data, respData, data->ssl.tls_in);
1204                 break;
1205         case SUCCESS_REQ:
1206                 eap_peap_state(data, SUCCESS);
1207                 eap_peap_valid_session(sm, data);
1208                 break;
1209         case FAILURE_REQ:
1210                 eap_peap_state(data, FAILURE);
1211                 break;
1212         default:
1213                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected state %d in %s",
1214                            data->state, __func__);
1215                 break;
1216         }
1217 }
1218
1219
1220 static void eap_peap_process(struct eap_sm *sm, void *priv,
1221                              struct wpabuf *respData)
1222 {
1223         struct eap_peap_data *data = priv;
1224         const struct wpabuf *buf;
1225         const u8 *pos;
1226         u8 id_len;
1227
1228         if (eap_server_tls_process(sm, &data->ssl, respData, data,
1229                                    EAP_TYPE_PEAP, eap_peap_process_version,
1230                                    eap_peap_process_msg) < 0) {
1231                 eap_peap_state(data, FAILURE);
1232                 return;
1233         }
1234
1235         if (data->state == SUCCESS ||
1236             !tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
1237             !tls_connection_resumed(sm->ssl_ctx, data->ssl.conn))
1238                 return;
1239
1240         buf = tls_connection_get_success_data(data->ssl.conn);
1241         if (!buf || wpabuf_len(buf) < 2) {
1242                 wpa_printf(MSG_DEBUG,
1243                            "EAP-PEAP: No success data in resumed session - reject attempt");
1244                 eap_peap_state(data, FAILURE);
1245                 return;
1246         }
1247
1248         pos = wpabuf_head(buf);
1249         if (*pos != EAP_TYPE_PEAP) {
1250                 wpa_printf(MSG_DEBUG,
1251                            "EAP-PEAP: Resumed session for another EAP type (%u) - reject attempt",
1252                            *pos);
1253                 eap_peap_state(data, FAILURE);
1254                 return;
1255         }
1256
1257         pos++;
1258         id_len = *pos++;
1259         wpa_hexdump_ascii(MSG_DEBUG, "EAP-PEAP: Identity from cached session",
1260                           pos, id_len);
1261         os_free(sm->identity);
1262         sm->identity = os_malloc(id_len ? id_len : 1);
1263         if (!sm->identity) {
1264                 sm->identity_len = 0;
1265                 eap_peap_state(data, FAILURE);
1266                 return;
1267         }
1268
1269         os_memcpy(sm->identity, pos, id_len);
1270         sm->identity_len = id_len;
1271
1272         if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1273                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-PEAP: Phase2 Identity not found in the user database",
1274                                   sm->identity, sm->identity_len);
1275                 eap_peap_state(data, FAILURE);
1276                 return;
1277         }
1278
1279         wpa_printf(MSG_DEBUG,
1280                    "EAP-PEAP: Resuming previous session - skip Phase2");
1281         eap_peap_req_success(sm, data);
1282         if (data->state == SUCCESS_REQ)
1283                 tls_connection_set_success_data_resumed(data->ssl.conn);
1284 }
1285
1286
1287 static Boolean eap_peap_isDone(struct eap_sm *sm, void *priv)
1288 {
1289         struct eap_peap_data *data = priv;
1290         return data->state == SUCCESS || data->state == FAILURE;
1291 }
1292
1293
1294 static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
1295 {
1296         struct eap_peap_data *data = priv;
1297         u8 *eapKeyData;
1298
1299         if (data->state != SUCCESS)
1300                 return NULL;
1301
1302         if (data->crypto_binding_used) {
1303                 u8 csk[128];
1304                 /*
1305                  * Note: It looks like Microsoft implementation requires null
1306                  * termination for this label while the one used for deriving
1307                  * IPMK|CMK did not use null termination.
1308                  */
1309                 if (peap_prfplus(data->peap_version, data->ipmk, 40,
1310                                  "Session Key Generating Function",
1311                                  (u8 *) "\00", 1, csk, sizeof(csk)) < 0)
1312                         return NULL;
1313                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
1314                 eapKeyData = os_malloc(EAP_TLS_KEY_LEN);
1315                 if (eapKeyData) {
1316                         os_memcpy(eapKeyData, csk, EAP_TLS_KEY_LEN);
1317                         *len = EAP_TLS_KEY_LEN;
1318                         wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1319                                     eapKeyData, EAP_TLS_KEY_LEN);
1320                 } else {
1321                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to derive "
1322                                    "key");
1323                 }
1324
1325                 return eapKeyData;
1326         }
1327
1328         /* TODO: PEAPv1 - different label in some cases */
1329         eapKeyData = eap_server_tls_derive_key(sm, &data->ssl,
1330                                                "client EAP encryption",
1331                                                EAP_TLS_KEY_LEN);
1332         if (eapKeyData) {
1333                 *len = EAP_TLS_KEY_LEN;
1334                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1335                             eapKeyData, EAP_TLS_KEY_LEN);
1336         } else {
1337                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to derive key");
1338         }
1339
1340         return eapKeyData;
1341 }
1342
1343
1344 static Boolean eap_peap_isSuccess(struct eap_sm *sm, void *priv)
1345 {
1346         struct eap_peap_data *data = priv;
1347         return data->state == SUCCESS;
1348 }
1349
1350
1351 static u8 * eap_peap_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1352 {
1353         struct eap_peap_data *data = priv;
1354
1355         if (data->state != SUCCESS)
1356                 return NULL;
1357
1358         return eap_server_tls_derive_session_id(sm, &data->ssl, EAP_TYPE_PEAP,
1359                                                 len);
1360 }
1361
1362
1363 int eap_server_peap_register(void)
1364 {
1365         struct eap_method *eap;
1366
1367         eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1368                                       EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
1369         if (eap == NULL)
1370                 return -1;
1371
1372         eap->init = eap_peap_init;
1373         eap->reset = eap_peap_reset;
1374         eap->buildReq = eap_peap_buildReq;
1375         eap->check = eap_peap_check;
1376         eap->process = eap_peap_process;
1377         eap->isDone = eap_peap_isDone;
1378         eap->getKey = eap_peap_getKey;
1379         eap->isSuccess = eap_peap_isSuccess;
1380         eap->getSessionId = eap_peap_get_session_id;
1381
1382         return eap_server_method_register(eap);
1383 }