src/eap_peer/eap_peap.c

   1 /*
   2  * EAP peer method: EAP-PEAP (draft-josefsson-pppext-eap-tls-eap-10.txt)
   3  * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "crypto/sha1.h"
  19 #include "eap_i.h"
  20 #include "eap_tls_common.h"
  21 #include "eap_config.h"
  22 #include "tls.h"
  23 #include "eap_common/eap_tlv_common.h"
  24 #include "eap_common/eap_peap_common.h"
  25 #include "tncc.h"
  26
  27
  28 /* Maximum supported PEAP version
  29  * 0 = Microsoft's PEAP version 0; draft-kamath-pppext-peapv0-00.txt
  30  * 1 = draft-josefsson-ppext-eap-tls-eap-05.txt
  31  * 2 = draft-josefsson-ppext-eap-tls-eap-10.txt
  32  */
  33 #define EAP_PEAP_VERSION 1
  34
  35
  36 static void eap_peap_deinit(struct eap_sm *sm, void *priv);
  37
  38
  39 struct eap_peap_data {
  40         struct eap_ssl_data ssl;
  41
  42         int peap_version, force_peap_version, force_new_label;
  43
  44         const struct eap_method *phase2_method;
  45         void *phase2_priv;
  46         int phase2_success;
  47         int phase2_eap_success;
  48         int phase2_eap_started;
  49
  50         struct eap_method_type phase2_type;
  51         struct eap_method_type *phase2_types;
  52         size_t num_phase2_types;
  53
  54         int peap_outer_success; /* 0 = PEAP terminated on Phase 2 inner
  55                                  * EAP-Success
  56                                  * 1 = reply with tunneled EAP-Success to inner
  57                                  * EAP-Success and expect AS to send outer
  58                                  * (unencrypted) EAP-Success after this
  59                                  * 2 = reply with PEAP/TLS ACK to inner
  60                                  * EAP-Success and expect AS to send outer
  61                                  * (unencrypted) EAP-Success after this */
  62         int resuming; /* starting a resumed session */
  63         u8 *key_data;
  64
  65         struct wpabuf *pending_phase2_req;
  66         enum { NO_BINDING, OPTIONAL_BINDING, REQUIRE_BINDING } crypto_binding;
  67         int crypto_binding_used;
  68         u8 ipmk[40];
  69         u8 cmk[20];
  70         int soh; /* Whether IF-TNCCS-SOH (Statement of Health; Microsoft NAP)
  71                   * is enabled. */
  72 };
  73
  74
  75 static int eap_peap_parse_phase1(struct eap_peap_data *data,
  76                                  const char *phase1)
  77 {
  78         const char *pos;
  79
  80         pos = os_strstr(phase1, "peapver=");
  81         if (pos) {
  82                 data->force_peap_version = atoi(pos + 8);
  83                 data->peap_version = data->force_peap_version;
  84                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Forced PEAP version %d",
  85                            data->force_peap_version);
  86         }
  87
  88         if (os_strstr(phase1, "peaplabel=1")) {
  89                 data->force_new_label = 1;
  90                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Force new label for key "
  91                            "derivation");
  92         }
  93
  94         if (os_strstr(phase1, "peap_outer_success=0")) {
  95                 data->peap_outer_success = 0;
  96                 wpa_printf(MSG_DEBUG, "EAP-PEAP: terminate authentication on "
  97                            "tunneled EAP-Success");
  98         } else if (os_strstr(phase1, "peap_outer_success=1")) {
  99                 data->peap_outer_success = 1;
 100                 wpa_printf(MSG_DEBUG, "EAP-PEAP: send tunneled EAP-Success "
 101                            "after receiving tunneled EAP-Success");
 102         } else if (os_strstr(phase1, "peap_outer_success=2")) {
 103                 data->peap_outer_success = 2;
 104                 wpa_printf(MSG_DEBUG, "EAP-PEAP: send PEAP/TLS ACK after "
 105                            "receiving tunneled EAP-Success");
 106         }
 107
 108         if (os_strstr(phase1, "crypto_binding=0")) {
 109                 data->crypto_binding = NO_BINDING;
 110                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Do not use cryptobinding");
 111         } else if (os_strstr(phase1, "crypto_binding=1")) {
 112                 data->crypto_binding = OPTIONAL_BINDING;
 113                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Optional cryptobinding");
 114         } else if (os_strstr(phase1, "crypto_binding=2")) {
 115                 data->crypto_binding = REQUIRE_BINDING;
 116                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Require cryptobinding");
 117         }
 118
 119 #ifdef EAP_TNC
 120         if (os_strstr(phase1, "tnc=soh")) {
 121                 data->soh = 1;
 122                 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH enabled");
 123         }
 124 #endif /* EAP_TNC */
 125
 126         return 0;
 127 }
 128
 129
 130 static void * eap_peap_init(struct eap_sm *sm)
 131 {
 132         struct eap_peap_data *data;
 133         struct eap_peer_config *config = eap_get_config(sm);
 134
 135         data = os_zalloc(sizeof(*data));
 136         if (data == NULL)
 137                 return NULL;
 138         sm->peap_done = FALSE;
 139         data->peap_version = EAP_PEAP_VERSION;
 140         data->force_peap_version = -1;
 141         data->peap_outer_success = 2;
 142         data->crypto_binding = OPTIONAL_BINDING;
 143
 144         if (config && config->phase1 &&
 145             eap_peap_parse_phase1(data, config->phase1) < 0) {
 146                 eap_peap_deinit(sm, data);
 147                 return NULL;
 148         }
 149
 150         if (eap_peer_select_phase2_methods(config, "auth=",
 151                                            &data->phase2_types,
 152                                            &data->num_phase2_types) < 0) {
 153                 eap_peap_deinit(sm, data);
 154                 return NULL;
 155         }
 156
 157         data->phase2_type.vendor = EAP_VENDOR_IETF;
 158         data->phase2_type.method = EAP_TYPE_NONE;
 159
 160         if (eap_peer_tls_ssl_init(sm, &data->ssl, config)) {
 161                 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
 162                 eap_peap_deinit(sm, data);
 163                 return NULL;
 164         }
 165
 166         return data;
 167 }
 168
 169
 170 static void eap_peap_deinit(struct eap_sm *sm, void *priv)
 171 {
 172         struct eap_peap_data *data = priv;
 173         if (data == NULL)
 174                 return;
 175         if (data->phase2_priv && data->phase2_method)
 176                 data->phase2_method->deinit(sm, data->phase2_priv);
 177         os_free(data->phase2_types);
 178         eap_peer_tls_ssl_deinit(sm, &data->ssl);
 179         os_free(data->key_data);
 180         wpabuf_free(data->pending_phase2_req);
 181         os_free(data);
 182 }
 183
 184
 185 /**
 186  * eap_tlv_build_nak - Build EAP-TLV NAK message
 187  * @id: EAP identifier for the header
 188  * @nak_type: TLV type (EAP_TLV_*)
 189  * Returns: Buffer to the allocated EAP-TLV NAK message or %NULL on failure
 190  *
 191  * This funtion builds an EAP-TLV NAK message. The caller is responsible for
 192  * freeing the returned buffer.
 193  */
 194 static struct wpabuf * eap_tlv_build_nak(int id, u16 nak_type)
 195 {
 196         struct wpabuf *msg;
 197
 198         msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, 10,
 199                             EAP_CODE_RESPONSE, id);
 200         if (msg == NULL)
 201                 return NULL;
 202
 203         wpabuf_put_u8(msg, 0x80); /* Mandatory */
 204         wpabuf_put_u8(msg, EAP_TLV_NAK_TLV);
 205         wpabuf_put_be16(msg, 6); /* Length */
 206         wpabuf_put_be32(msg, 0); /* Vendor-Id */
 207         wpabuf_put_be16(msg, nak_type); /* NAK-Type */
 208
 209         return msg;
 210 }
 211
 212
 213 static int eap_peap_get_isk(struct eap_sm *sm, struct eap_peap_data *data,
 214                             u8 *isk, size_t isk_len)
 215 {
 216         u8 *key;
 217         size_t key_len;
 218
 219         os_memset(isk, 0, isk_len);
 220         if (data->phase2_method == NULL || data->phase2_priv == NULL ||
 221             data->phase2_method->isKeyAvailable == NULL ||
 222             data->phase2_method->getKey == NULL)
 223                 return 0;
 224
 225         if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
 226             (key = data->phase2_method->getKey(sm, data->phase2_priv,
 227                                                &key_len)) == NULL) {
 228                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not get key material "
 229                            "from Phase 2");
 230                 return -1;
 231         }
 232
 233         if (key_len == 32 &&
 234             data->phase2_method->vendor == EAP_VENDOR_IETF &&
 235             data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
 236                 /*
 237                  * Microsoft uses reverse order for MS-MPPE keys in
 238                  * EAP-PEAP when compared to EAP-FAST derivation of
 239                  * ISK. Swap the keys here to get the correct ISK for
 240                  * EAP-PEAPv0 cryptobinding.
 241                  */
 242                 u8 tmp[16];
 243                 os_memcpy(tmp, key, 16);
 244                 os_memcpy(key, key + 16, 16);
 245                 os_memcpy(key + 16, tmp, 16);
 246         }
 247
 248         if (key_len > isk_len)
 249                 key_len = isk_len;
 250         os_memcpy(isk, key, key_len);
 251         os_free(key);
 252
 253         return 0;
 254 }
 255
 256
 257 static int eap_peap_derive_cmk(struct eap_sm *sm, struct eap_peap_data *data)
 258 {
 259         u8 *tk;
 260         u8 isk[32], imck[60];
 261
 262         /*
 263          * Tunnel key (TK) is the first 60 octets of the key generated by
 264          * phase 1 of PEAP (based on TLS).
 265          */
 266         tk = data->key_data;
 267         if (tk == NULL)
 268                 return -1;
 269         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60);
 270
 271         if (eap_peap_get_isk(sm, data, isk, sizeof(isk)) < 0)
 272                 return -1;
 273         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk));
 274
 275         /*
 276          * IPMK Seed = "Inner Methods Compound Keys" | ISK
 277          * TempKey = First 40 octets of TK
 278          * IPMK|CMK = PRF+(TempKey, IPMK Seed, 60)
 279          * (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space
 280          * in the end of the label just before ISK; is that just a typo?)
 281          */
 282         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40);
 283         peap_prfplus(data->peap_version, tk, 40, "Inner Methods Compound Keys",
 284                      isk, sizeof(isk), imck, sizeof(imck));
 285         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
 286                         imck, sizeof(imck));
 287
 288         /* TODO: fast-connect: IPMK|CMK = TK */
 289         os_memcpy(data->ipmk, imck, 40);
 290         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
 291         os_memcpy(data->cmk, imck + 40, 20);
 292         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);
 293
 294         return 0;
 295 }
 296
 297
 298 static int eap_tlv_add_cryptobinding(struct eap_sm *sm,
 299                                      struct eap_peap_data *data,
 300                                      struct wpabuf *buf)
 301 {
 302         u8 *mac;
 303         u8 eap_type = EAP_TYPE_PEAP;
 304         const u8 *addr[2];
 305         size_t len[2];
 306         u16 tlv_type;
 307         u8 binding_nonce[32];
 308
 309         /* FIX: should binding_nonce be copied from request? */
 310         if (os_get_random(binding_nonce, 32))
 311                 return -1;
 312
 313         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
 314         addr[0] = wpabuf_put(buf, 0);
 315         len[0] = 60;
 316         addr[1] = &eap_type;
 317         len[1] = 1;
 318
 319         tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
 320         if (data->peap_version >= 2)
 321                 tlv_type |= EAP_TLV_TYPE_MANDATORY;
 322         wpabuf_put_be16(buf, tlv_type);
 323         wpabuf_put_be16(buf, 56);
 324
 325         wpabuf_put_u8(buf, 0); /* Reserved */
 326         wpabuf_put_u8(buf, data->peap_version); /* Version */
 327         wpabuf_put_u8(buf, data->peap_version); /* RecvVersion */
 328         wpabuf_put_u8(buf, 1); /* SubType: 0 = Request, 1 = Response */
 329         wpabuf_put_data(buf, binding_nonce, 32); /* Nonce */
 330         mac = wpabuf_put(buf, 20); /* Compound_MAC */
 331         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK", data->cmk, 20);
 332         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
 333                     addr[0], len[0]);
 334         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
 335                     addr[1], len[1]);
 336         hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac);
 337         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC", mac, SHA1_MAC_LEN);
 338         data->crypto_binding_used = 1;
 339
 340         return 0;
 341 }
 342
 343
 344 /**
 345  * eap_tlv_build_result - Build EAP-TLV Result message
 346  * @id: EAP identifier for the header
 347  * @status: Status (EAP_TLV_RESULT_SUCCESS or EAP_TLV_RESULT_FAILURE)
 348  * Returns: Buffer to the allocated EAP-TLV Result message or %NULL on failure
 349  *
 350  * This funtion builds an EAP-TLV Result message. The caller is responsible for
 351  * freeing the returned buffer.
 352  */
 353 static struct wpabuf * eap_tlv_build_result(struct eap_sm *sm,
 354                                             struct eap_peap_data *data,
 355                                             int crypto_tlv_used,
 356                                             int id, u16 status)
 357 {
 358         struct wpabuf *msg;
 359         size_t len;
 360
 361         if (data->crypto_binding == NO_BINDING)
 362                 crypto_tlv_used = 0;
 363
 364         len = 6;
 365         if (crypto_tlv_used)
 366                 len += 60; /* Cryptobinding TLV */
 367         msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len,
 368                             EAP_CODE_RESPONSE, id);
 369         if (msg == NULL)
 370                 return NULL;
 371
 372         wpabuf_put_u8(msg, 0x80); /* Mandatory */
 373         wpabuf_put_u8(msg, EAP_TLV_RESULT_TLV);
 374         wpabuf_put_be16(msg, 2); /* Length */
 375         wpabuf_put_be16(msg, status); /* Status */
 376
 377         if (crypto_tlv_used && eap_tlv_add_cryptobinding(sm, data, msg)) {
 378                 wpabuf_free(msg);
 379                 return NULL;
 380         }
 381
 382         return msg;
 383 }
 384
 385
 386 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
 387                                           struct eap_peap_data *data,
 388                                           const u8 *crypto_tlv,
 389                                           size_t crypto_tlv_len)
 390 {
 391         u8 buf[61], mac[SHA1_MAC_LEN];
 392         const u8 *pos;
 393
 394         if (eap_peap_derive_cmk(sm, data) < 0) {
 395                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not derive CMK");
 396                 return -1;
 397         }
 398
 399         if (crypto_tlv_len != 4 + 56) {
 400                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
 401                            "length %d", (int) crypto_tlv_len);
 402                 return -1;
 403         }
 404
 405         pos = crypto_tlv;
 406         pos += 4; /* TLV header */
 407         if (pos[1] != data->peap_version) {
 408                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
 409                            "mismatch (was %d; expected %d)",
 410                            pos[1], data->peap_version);
 411                 return -1;
 412         }
 413
 414         if (pos[3] != 0) {
 415                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
 416                            "SubType %d", pos[3]);
 417                 return -1;
 418         }
 419         pos += 4;
 420         pos += 32; /* Nonce */
 421
 422         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
 423         os_memcpy(buf, crypto_tlv, 60);
 424         os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
 425         buf[60] = EAP_TYPE_PEAP;
 426         hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
 427
 428         if (os_memcmp(mac, pos, SHA1_MAC_LEN) != 0) {
 429                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
 430                            "cryptobinding TLV");
 431                 return -1;
 432         }
 433
 434         wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
 435
 436         return 0;
 437 }
 438
 439
 440 /**
 441  * eap_tlv_process - Process a received EAP-TLV message and generate a response
 442  * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
 443  * @ret: Return values from EAP request validation and processing
 444  * @req: EAP-TLV request to be processed. The caller must have validated that
 445  * the buffer is large enough to contain full request (hdr->length bytes) and
 446  * that the EAP type is EAP_TYPE_TLV.
 447  * @resp: Buffer to return a pointer to the allocated response message. This
 448  * field should be initialized to %NULL before the call. The value will be
 449  * updated if a response message is generated. The caller is responsible for
 450  * freeing the allocated message.
 451  * @force_failure: Force negotiation to fail
 452  * Returns: 0 on success, -1 on failure
 453  */
 454 static int eap_tlv_process(struct eap_sm *sm, struct eap_peap_data *data,
 455                            struct eap_method_ret *ret,
 456                            const struct wpabuf *req, struct wpabuf **resp,
 457                            int force_failure)
 458 {
 459         size_t left, tlv_len;
 460         const u8 *pos;
 461         const u8 *result_tlv = NULL, *crypto_tlv = NULL;
 462         size_t result_tlv_len = 0, crypto_tlv_len = 0;
 463         int tlv_type, mandatory;
 464
 465         /* Parse TLVs */
 466         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, req, &left);
 467         if (pos == NULL)
 468                 return -1;
 469         wpa_hexdump(MSG_DEBUG, "EAP-TLV: Received TLVs", pos, left);
 470         while (left >= 4) {
 471                 mandatory = !!(pos[0] & 0x80);
 472                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
 473                 pos += 2;
 474                 tlv_len = WPA_GET_BE16(pos);
 475                 pos += 2;
 476                 left -= 4;
 477                 if (tlv_len > left) {
 478                         wpa_printf(MSG_DEBUG, "EAP-TLV: TLV underrun "
 479                                    "(tlv_len=%lu left=%lu)",
 480                                    (unsigned long) tlv_len,
 481                                    (unsigned long) left);
 482                         return -1;
 483                 }
 484                 switch (tlv_type) {
 485                 case EAP_TLV_RESULT_TLV:
 486                         result_tlv = pos;
 487                         result_tlv_len = tlv_len;
 488                         break;
 489                 case EAP_TLV_CRYPTO_BINDING_TLV:
 490                         crypto_tlv = pos;
 491                         crypto_tlv_len = tlv_len;
 492                         break;
 493                 default:
 494                         wpa_printf(MSG_DEBUG, "EAP-TLV: Unsupported TLV Type "
 495                                    "%d%s", tlv_type,
 496                                    mandatory ? " (mandatory)" : "");
 497                         if (mandatory) {
 498                                 /* NAK TLV and ignore all TLVs in this packet.
 499                                  */
 500                                 *resp = eap_tlv_build_nak(eap_get_id(req),
 501                                                           tlv_type);
 502                                 return *resp == NULL ? -1 : 0;
 503                         }
 504                         /* Ignore this TLV, but process other TLVs */
 505                         break;
 506                 }
 507
 508                 pos += tlv_len;
 509                 left -= tlv_len;
 510         }
 511         if (left) {
 512                 wpa_printf(MSG_DEBUG, "EAP-TLV: Last TLV too short in "
 513                            "Request (left=%lu)", (unsigned long) left);
 514                 return -1;
 515         }
 516
 517         /* Process supported TLVs */
 518         if (crypto_tlv && data->crypto_binding != NO_BINDING) {
 519                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
 520                             crypto_tlv, crypto_tlv_len);
 521                 if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
 522                                                    crypto_tlv_len + 4) < 0) {
 523                         if (result_tlv == NULL)
 524                                 return -1;
 525                         force_failure = 1;
 526                 }
 527         } else if (!crypto_tlv && data->crypto_binding == REQUIRE_BINDING) {
 528                 wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
 529                 return -1;
 530         }
 531
 532         if (result_tlv) {
 533                 int status, resp_status;
 534                 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Result TLV",
 535                             result_tlv, result_tlv_len);
 536                 if (result_tlv_len < 2) {
 537                         wpa_printf(MSG_INFO, "EAP-TLV: Too short Result TLV "
 538                                    "(len=%lu)",
 539                                    (unsigned long) result_tlv_len);
 540                         return -1;
 541                 }
 542                 status = WPA_GET_BE16(result_tlv);
 543                 if (status == EAP_TLV_RESULT_SUCCESS) {
 544                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Success "
 545                                    "- EAP-TLV/Phase2 Completed");
 546                         if (force_failure) {
 547                                 wpa_printf(MSG_INFO, "EAP-TLV: Earlier failure"
 548                                            " - force failed Phase 2");
 549                                 resp_status = EAP_TLV_RESULT_FAILURE;
 550                                 ret->decision = DECISION_FAIL;
 551                         } else {
 552                                 resp_status = EAP_TLV_RESULT_SUCCESS;
 553                                 ret->decision = DECISION_UNCOND_SUCC;
 554                         }
 555                 } else if (status == EAP_TLV_RESULT_FAILURE) {
 556                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Failure");
 557                         resp_status = EAP_TLV_RESULT_FAILURE;
 558                         ret->decision = DECISION_FAIL;
 559                 } else {
 560                         wpa_printf(MSG_INFO, "EAP-TLV: Unknown TLV Result "
 561                                    "Status %d", status);
 562                         resp_status = EAP_TLV_RESULT_FAILURE;
 563                         ret->decision = DECISION_FAIL;
 564                 }
 565                 ret->methodState = METHOD_DONE;
 566
 567                 *resp = eap_tlv_build_result(sm, data, crypto_tlv != NULL,
 568                                              eap_get_id(req), resp_status);
 569         }
 570
 571         return 0;
 572 }
 573
 574
 575 static struct wpabuf * eap_peapv2_tlv_eap_payload(struct wpabuf *buf)
 576 {
 577         struct wpabuf *e;
 578         struct eap_tlv_hdr *tlv;
 579
 580         if (buf == NULL)
 581                 return NULL;
 582
 583         /* Encapsulate EAP packet in EAP-Payload TLV */
 584         wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Add EAP-Payload TLV");
 585         e = wpabuf_alloc(sizeof(*tlv) + wpabuf_len(buf));
 586         if (e == NULL) {
 587                 wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Failed to allocate memory "
 588                            "for TLV encapsulation");
 589                 wpabuf_free(buf);
 590                 return NULL;
 591         }
 592         tlv = wpabuf_put(e, sizeof(*tlv));
 593         tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 594                                      EAP_TLV_EAP_PAYLOAD_TLV);
 595         tlv->length = host_to_be16(wpabuf_len(buf));
 596         wpabuf_put_buf(e, buf);
 597         wpabuf_free(buf);
 598         return e;
 599 }
 600
 601
 602 static int eap_peap_phase2_request(struct eap_sm *sm,
 603                                    struct eap_peap_data *data,
 604                                    struct eap_method_ret *ret,
 605                                    struct wpabuf *req,
 606                                    struct wpabuf **resp)
 607 {
 608         struct eap_hdr *hdr = wpabuf_mhead(req);
 609         size_t len = be_to_host16(hdr->length);
 610         u8 *pos;
 611         struct eap_method_ret iret;
 612         struct eap_peer_config *config = eap_get_config(sm);
 613
 614         if (len <= sizeof(struct eap_hdr)) {
 615                 wpa_printf(MSG_INFO, "EAP-PEAP: too short "
 616                            "Phase 2 request (len=%lu)", (unsigned long) len);
 617                 return -1;
 618         }
 619         pos = (u8 *) (hdr + 1);
 620         wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Request: type=%d", *pos);
 621         switch (*pos) {
 622         case EAP_TYPE_IDENTITY:
 623                 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
 624                 break;
 625         case EAP_TYPE_TLV:
 626                 os_memset(&iret, 0, sizeof(iret));
 627                 if (eap_tlv_process(sm, data, &iret, req, resp,
 628                                     data->phase2_eap_started &&
 629                                     !data->phase2_eap_success)) {
 630                         ret->methodState = METHOD_DONE;
 631                         ret->decision = DECISION_FAIL;
 632                         return -1;
 633                 }
 634                 if (iret.methodState == METHOD_DONE ||
 635                     iret.methodState == METHOD_MAY_CONT) {
 636                         ret->methodState = iret.methodState;
 637                         ret->decision = iret.decision;
 638                         data->phase2_success = 1;
 639                 }
 640                 break;
 641         case EAP_TYPE_EXPANDED:
 642 #ifdef EAP_TNC
 643                 if (data->soh) {
 644                         const u8 *epos;
 645                         size_t eleft;
 646
 647                         epos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21,
 648                                                 req, &eleft);
 649                         if (epos) {
 650                                 struct wpabuf *buf;
 651                                 wpa_printf(MSG_DEBUG,
 652                                            "EAP-PEAP: SoH EAP Extensions");
 653                                 buf = tncc_process_soh_request(epos, eleft);
 654                                 if (buf) {
 655                                         *resp = eap_msg_alloc(
 656                                                 EAP_VENDOR_MICROSOFT, 0x21,
 657                                                 wpabuf_len(buf),
 658                                                 EAP_CODE_RESPONSE,
 659                                                 hdr->identifier);
 660                                         if (*resp == NULL) {
 661                                                 ret->methodState = METHOD_DONE;
 662                                                 ret->decision = DECISION_FAIL;
 663                                                 return -1;
 664                                         }
 665                                         wpabuf_put_buf(*resp, buf);
 666                                         wpabuf_free(buf);
 667                                         break;
 668                                 }
 669                         }
 670                 }
 671 #endif /* EAP_TNC */
 672                 /* fall through */
 673         default:
 674                 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
 675                     data->phase2_type.method == EAP_TYPE_NONE) {
 676                         size_t i;
 677                         for (i = 0; i < data->num_phase2_types; i++) {
 678                                 if (data->phase2_types[i].vendor !=
 679                                     EAP_VENDOR_IETF ||
 680                                     data->phase2_types[i].method != *pos)
 681                                         continue;
 682
 683                                 data->phase2_type.vendor =
 684                                         data->phase2_types[i].vendor;
 685                                 data->phase2_type.method =
 686                                         data->phase2_types[i].method;
 687                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Selected "
 688                                            "Phase 2 EAP vendor %d method %d",
 689                                            data->phase2_type.vendor,
 690                                            data->phase2_type.method);
 691                                 break;
 692                         }
 693                 }
 694                 if (*pos != data->phase2_type.method ||
 695                     *pos == EAP_TYPE_NONE) {
 696                         if (eap_peer_tls_phase2_nak(data->phase2_types,
 697                                                     data->num_phase2_types,
 698                                                     hdr, resp))
 699                                 return -1;
 700                         return 0;
 701                 }
 702
 703                 if (data->phase2_priv == NULL) {
 704                         data->phase2_method = eap_peer_get_eap_method(
 705                                 data->phase2_type.vendor,
 706                                 data->phase2_type.method);
 707                         if (data->phase2_method) {
 708                                 sm->init_phase2 = 1;
 709                                 sm->mschapv2_full_key = 1;
 710                                 data->phase2_priv =
 711                                         data->phase2_method->init(sm);
 712                                 sm->init_phase2 = 0;
 713                                 sm->mschapv2_full_key = 0;
 714                         }
 715                 }
 716                 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
 717                         wpa_printf(MSG_INFO, "EAP-PEAP: failed to initialize "
 718                                    "Phase 2 EAP method %d", *pos);
 719                         ret->methodState = METHOD_DONE;
 720                         ret->decision = DECISION_FAIL;
 721                         return -1;
 722                 }
 723                 data->phase2_eap_started = 1;
 724                 os_memset(&iret, 0, sizeof(iret));
 725                 *resp = data->phase2_method->process(sm, data->phase2_priv,
 726                                                      &iret, req);
 727                 if ((iret.methodState == METHOD_DONE ||
 728                      iret.methodState == METHOD_MAY_CONT) &&
 729                     (iret.decision == DECISION_UNCOND_SUCC ||
 730                      iret.decision == DECISION_COND_SUCC)) {
 731                         data->phase2_eap_success = 1;
 732                         data->phase2_success = 1;
 733                 }
 734                 break;
 735         }
 736
 737         if (*resp == NULL &&
 738             (config->pending_req_identity || config->pending_req_password ||
 739              config->pending_req_otp || config->pending_req_new_password)) {
 740                 wpabuf_free(data->pending_phase2_req);
 741                 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
 742         }
 743
 744         return 0;
 745 }
 746
 747
 748 static int eap_peap_decrypt(struct eap_sm *sm, struct eap_peap_data *data,
 749                             struct eap_method_ret *ret,
 750                             const struct eap_hdr *req,
 751                             const struct wpabuf *in_data,
 752                             struct wpabuf **out_data)
 753 {
 754         struct wpabuf *in_decrypted = NULL;
 755         int res, skip_change = 0;
 756         struct eap_hdr *hdr, *rhdr;
 757         struct wpabuf *resp = NULL;
 758         size_t len;
 759
 760         wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
 761                    " Phase 2", (unsigned long) wpabuf_len(in_data));
 762
 763         if (data->pending_phase2_req) {
 764                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 request - "
 765                            "skip decryption and use old data");
 766                 /* Clear TLS reassembly state. */
 767                 eap_peer_tls_reset_input(&data->ssl);
 768                 in_decrypted = data->pending_phase2_req;
 769                 data->pending_phase2_req = NULL;
 770                 skip_change = 1;
 771                 goto continue_req;
 772         }
 773
 774         if (wpabuf_len(in_data) == 0 && sm->workaround &&
 775             data->phase2_success) {
 776                 /*
 777                  * Cisco ACS seems to be using TLS ACK to terminate
 778                  * EAP-PEAPv0/GTC. Try to reply with TLS ACK.
 779                  */
 780                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Received TLS ACK, but "
 781                            "expected data - acknowledge with TLS ACK since "
 782                            "Phase 2 has been completed");
 783                 ret->decision = DECISION_COND_SUCC;
 784                 ret->methodState = METHOD_DONE;
 785                 return 1;
 786         } else if (wpabuf_len(in_data) == 0) {
 787                 /* Received TLS ACK - requesting more fragments */
 788                 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
 789                                             data->peap_version,
 790                                             req->identifier, NULL, out_data);
 791         }
 792
 793         res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
 794         if (res)
 795                 return res;
 796
 797 continue_req:
 798         wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
 799                         in_decrypted);
 800
 801         hdr = wpabuf_mhead(in_decrypted);
 802         if (wpabuf_len(in_decrypted) == 5 && hdr->code == EAP_CODE_REQUEST &&
 803             be_to_host16(hdr->length) == 5 &&
 804             eap_get_type(in_decrypted) == EAP_TYPE_IDENTITY) {
 805                 /* At least FreeRADIUS seems to send full EAP header with
 806                  * EAP Request Identity */
 807                 skip_change = 1;
 808         }
 809         if (wpabuf_len(in_decrypted) >= 5 && hdr->code == EAP_CODE_REQUEST &&
 810             eap_get_type(in_decrypted) == EAP_TYPE_TLV) {
 811                 skip_change = 1;
 812         }
 813
 814         if (data->peap_version == 0 && !skip_change) {
 815                 struct eap_hdr *nhdr;
 816                 struct wpabuf *nmsg = wpabuf_alloc(sizeof(struct eap_hdr) +
 817                                                    wpabuf_len(in_decrypted));
 818                 if (nmsg == NULL) {
 819                         wpabuf_free(in_decrypted);
 820                         return 0;
 821                 }
 822                 nhdr = wpabuf_put(nmsg, sizeof(*nhdr));
 823                 wpabuf_put_buf(nmsg, in_decrypted);
 824                 nhdr->code = req->code;
 825                 nhdr->identifier = req->identifier;
 826                 nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
 827                                             wpabuf_len(in_decrypted));
 828
 829                 wpabuf_free(in_decrypted);
 830                 in_decrypted = nmsg;
 831         }
 832
 833         if (data->peap_version >= 2) {
 834                 struct eap_tlv_hdr *tlv;
 835                 struct wpabuf *nmsg;
 836
 837                 if (wpabuf_len(in_decrypted) < sizeof(*tlv) + sizeof(*hdr)) {
 838                         wpa_printf(MSG_INFO, "EAP-PEAPv2: Too short Phase 2 "
 839                                    "EAP TLV");
 840                         wpabuf_free(in_decrypted);
 841                         return 0;
 842                 }
 843                 tlv = wpabuf_mhead(in_decrypted);
 844                 if ((be_to_host16(tlv->tlv_type) & 0x3fff) !=
 845                     EAP_TLV_EAP_PAYLOAD_TLV) {
 846                         wpa_printf(MSG_INFO, "EAP-PEAPv2: Not an EAP TLV");
 847                         wpabuf_free(in_decrypted);
 848                         return 0;
 849                 }
 850                 if (sizeof(*tlv) + be_to_host16(tlv->length) >
 851                     wpabuf_len(in_decrypted)) {
 852                         wpa_printf(MSG_INFO, "EAP-PEAPv2: Invalid EAP TLV "
 853                                    "length");
 854                         wpabuf_free(in_decrypted);
 855                         return 0;
 856                 }
 857                 hdr = (struct eap_hdr *) (tlv + 1);
 858                 if (be_to_host16(hdr->length) > be_to_host16(tlv->length)) {
 859                         wpa_printf(MSG_INFO, "EAP-PEAPv2: No room for full "
 860                                    "EAP packet in EAP TLV");
 861                         wpabuf_free(in_decrypted);
 862                         return 0;
 863                 }
 864
 865                 nmsg = wpabuf_alloc(be_to_host16(hdr->length));
 866                 if (nmsg == NULL) {
 867                         wpabuf_free(in_decrypted);
 868                         return 0;
 869                 }
 870
 871                 wpabuf_put_data(nmsg, hdr, be_to_host16(hdr->length));
 872                 wpabuf_free(in_decrypted);
 873                 in_decrypted = nmsg;
 874         }
 875
 876         hdr = wpabuf_mhead(in_decrypted);
 877         if (wpabuf_len(in_decrypted) < sizeof(*hdr)) {
 878                 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
 879                            "EAP frame (len=%lu)",
 880                            (unsigned long) wpabuf_len(in_decrypted));
 881                 wpabuf_free(in_decrypted);
 882                 return 0;
 883         }
 884         len = be_to_host16(hdr->length);
 885         if (len > wpabuf_len(in_decrypted)) {
 886                 wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
 887                            "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
 888                            (unsigned long) wpabuf_len(in_decrypted),
 889                            (unsigned long) len);
 890                 wpabuf_free(in_decrypted);
 891                 return 0;
 892         }
 893         if (len < wpabuf_len(in_decrypted)) {
 894                 wpa_printf(MSG_INFO, "EAP-PEAP: Odd.. Phase 2 EAP header has "
 895                            "shorter length than full decrypted data "
 896                            "(%lu < %lu)",
 897                            (unsigned long) len,
 898                            (unsigned long) wpabuf_len(in_decrypted));
 899         }
 900         wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
 901                    "identifier=%d length=%lu", hdr->code, hdr->identifier,
 902                    (unsigned long) len);
 903         switch (hdr->code) {
 904         case EAP_CODE_REQUEST:
 905                 if (eap_peap_phase2_request(sm, data, ret, in_decrypted,
 906                                             &resp)) {
 907                         wpabuf_free(in_decrypted);
 908                         wpa_printf(MSG_INFO, "EAP-PEAP: Phase2 Request "
 909                                    "processing failed");
 910                         return 0;
 911                 }
 912                 break;
 913         case EAP_CODE_SUCCESS:
 914                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
 915                 if (data->peap_version == 1) {
 916                         /* EAP-Success within TLS tunnel is used to indicate
 917                          * shutdown of the TLS channel. The authentication has
 918                          * been completed. */
 919                         if (data->phase2_eap_started &&
 920                             !data->phase2_eap_success) {
 921                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 "
 922                                            "Success used to indicate success, "
 923                                            "but Phase 2 EAP was not yet "
 924                                            "completed successfully");
 925                                 ret->methodState = METHOD_DONE;
 926                                 ret->decision = DECISION_FAIL;
 927                                 wpabuf_free(in_decrypted);
 928                                 return 0;
 929                         }
 930                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - "
 931                                    "EAP-Success within TLS tunnel - "
 932                                    "authentication completed");
 933                         ret->decision = DECISION_UNCOND_SUCC;
 934                         ret->methodState = METHOD_DONE;
 935                         data->phase2_success = 1;
 936                         if (data->peap_outer_success == 2) {
 937                                 wpabuf_free(in_decrypted);
 938                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK "
 939                                            "to finish authentication");
 940                                 return 1;
 941                         } else if (data->peap_outer_success == 1) {
 942                                 /* Reply with EAP-Success within the TLS
 943                                  * channel to complete the authentication. */
 944                                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
 945                                 if (resp) {
 946                                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
 947                                         rhdr->code = EAP_CODE_SUCCESS;
 948                                         rhdr->identifier = hdr->identifier;
 949                                         rhdr->length =
 950                                                 host_to_be16(sizeof(*rhdr));
 951                                 }
 952                         } else {
 953                                 /* No EAP-Success expected for Phase 1 (outer,
 954                                  * unencrypted auth), so force EAP state
 955                                  * machine to SUCCESS state. */
 956                                 sm->peap_done = TRUE;
 957                         }
 958                 } else {
 959                         /* FIX: ? */
 960                 }
 961                 break;
 962         case EAP_CODE_FAILURE:
 963                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
 964                 ret->decision = DECISION_FAIL;
 965                 ret->methodState = METHOD_MAY_CONT;
 966                 ret->allowNotifications = FALSE;
 967                 /* Reply with EAP-Failure within the TLS channel to complete
 968                  * failure reporting. */
 969                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
 970                 if (resp) {
 971                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
 972                         rhdr->code = EAP_CODE_FAILURE;
 973                         rhdr->identifier = hdr->identifier;
 974                         rhdr->length = host_to_be16(sizeof(*rhdr));
 975                 }
 976                 break;
 977         default:
 978                 wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
 979                            "Phase 2 EAP header", hdr->code);
 980                 break;
 981         }
 982
 983         wpabuf_free(in_decrypted);
 984
 985         if (resp) {
 986                 int skip_change2 = 0;
 987                 struct wpabuf *rmsg, buf;
 988
 989                 wpa_hexdump_buf_key(MSG_DEBUG,
 990                                     "EAP-PEAP: Encrypting Phase 2 data", resp);
 991                 /* PEAP version changes */
 992                 if (data->peap_version >= 2) {
 993                         resp = eap_peapv2_tlv_eap_payload(resp);
 994                         if (resp == NULL)
 995                                 return -1;
 996                 }
 997                 if (wpabuf_len(resp) >= 5 &&
 998                     wpabuf_head_u8(resp)[0] == EAP_CODE_RESPONSE &&
 999                     eap_get_type(resp) == EAP_TYPE_TLV)
1000                         skip_change2 = 1;
1001                 rmsg = resp;
1002                 if (data->peap_version == 0 && !skip_change2) {
1003                         wpabuf_set(&buf, wpabuf_head_u8(resp) +
1004                                    sizeof(struct eap_hdr),
1005                                    wpabuf_len(resp) - sizeof(struct eap_hdr));
1006                         rmsg = &buf;
1007                 }
1008
1009                 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
1010                                          data->peap_version, req->identifier,
1011                                          rmsg, out_data)) {
1012                         wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt "
1013                                    "a Phase 2 frame");
1014                 }
1015                 wpabuf_free(resp);
1016         }
1017
1018         return 0;
1019 }
1020
1021
1022 static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
1023                                         struct eap_method_ret *ret,
1024                                         const struct wpabuf *reqData)
1025 {
1026         const struct eap_hdr *req;
1027         size_t left;
1028         int res;
1029         u8 flags, id;
1030         struct wpabuf *resp;
1031         const u8 *pos;
1032         struct eap_peap_data *data = priv;
1033
1034         pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret,
1035                                         reqData, &left, &flags);
1036         if (pos == NULL)
1037                 return NULL;
1038         req = wpabuf_head(reqData);
1039         id = req->identifier;
1040
1041         if (flags & EAP_TLS_FLAGS_START) {
1042                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Start (server ver=%d, own "
1043                            "ver=%d)", flags & EAP_PEAP_VERSION_MASK,
1044                         data->peap_version);
1045                 if ((flags & EAP_PEAP_VERSION_MASK) < data->peap_version)
1046                         data->peap_version = flags & EAP_PEAP_VERSION_MASK;
1047                 if (data->force_peap_version >= 0 &&
1048                     data->force_peap_version != data->peap_version) {
1049                         wpa_printf(MSG_WARNING, "EAP-PEAP: Failed to select "
1050                                    "forced PEAP version %d",
1051                                    data->force_peap_version);
1052                         ret->methodState = METHOD_DONE;
1053                         ret->decision = DECISION_FAIL;
1054                         ret->allowNotifications = FALSE;
1055                         return NULL;
1056                 }
1057                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Using PEAP version %d",
1058                            data->peap_version);
1059                 left = 0; /* make sure that this frame is empty, even though it
1060                            * should always be, anyway */
1061         }
1062
1063         resp = NULL;
1064         if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1065             !data->resuming) {
1066                 struct wpabuf msg;
1067                 wpabuf_set(&msg, pos, left);
1068                 res = eap_peap_decrypt(sm, data, ret, req, &msg, &resp);
1069         } else {
1070                 res = eap_peer_tls_process_helper(sm, &data->ssl,
1071                                                   EAP_TYPE_PEAP,
1072                                                   data->peap_version, id, pos,
1073                                                   left, &resp);
1074
1075                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1076                         char *label;
1077                         wpa_printf(MSG_DEBUG,
1078                                    "EAP-PEAP: TLS done, proceed to Phase 2");
1079                         os_free(data->key_data);
1080                         /* draft-josefsson-ppext-eap-tls-eap-05.txt
1081                          * specifies that PEAPv1 would use "client PEAP
1082                          * encryption" as the label. However, most existing
1083                          * PEAPv1 implementations seem to be using the old
1084                          * label, "client EAP encryption", instead. Use the old
1085                          * label by default, but allow it to be configured with
1086                          * phase1 parameter peaplabel=1. */
1087                         if (data->peap_version > 1 || data->force_new_label)
1088                                 label = "client PEAP encryption";
1089                         else
1090                                 label = "client EAP encryption";
1091                         wpa_printf(MSG_DEBUG, "EAP-PEAP: using label '%s' in "
1092                                    "key derivation", label);
1093                         data->key_data =
1094                                 eap_peer_tls_derive_key(sm, &data->ssl, label,
1095                                                         EAP_TLS_KEY_LEN);
1096                         if (data->key_data) {
1097                                 wpa_hexdump_key(MSG_DEBUG,
1098                                                 "EAP-PEAP: Derived key",
1099                                                 data->key_data,
1100                                                 EAP_TLS_KEY_LEN);
1101                         } else {
1102                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to "
1103                                            "derive key");
1104                         }
1105
1106                         if (sm->workaround && data->resuming) {
1107                                 /*
1108                                  * At least few RADIUS servers (Aegis v1.1.6;
1109                                  * but not v1.1.4; and Cisco ACS) seem to be
1110                                  * terminating PEAPv1 (Aegis) or PEAPv0 (Cisco
1111                                  * ACS) session resumption with outer
1112                                  * EAP-Success. This does not seem to follow
1113                                  * draft-josefsson-pppext-eap-tls-eap-05.txt
1114                                  * section 4.2, so only allow this if EAP
1115                                  * workarounds are enabled.
1116                                  */
1117                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Workaround - "
1118                                            "allow outer EAP-Success to "
1119                                            "terminate PEAP resumption");
1120                                 ret->decision = DECISION_COND_SUCC;
1121                                 data->phase2_success = 1;
1122                         }
1123
1124                         data->resuming = 0;
1125                 }
1126
1127                 if (res == 2) {
1128                         struct wpabuf msg;
1129                         /*
1130                          * Application data included in the handshake message.
1131                          */
1132                         wpabuf_free(data->pending_phase2_req);
1133                         data->pending_phase2_req = resp;
1134                         resp = NULL;
1135                         wpabuf_set(&msg, pos, left);
1136                         res = eap_peap_decrypt(sm, data, ret, req, &msg,
1137                                                &resp);
1138                 }
1139         }
1140
1141         if (ret->methodState == METHOD_DONE) {
1142                 ret->allowNotifications = FALSE;
1143         }
1144
1145         if (res == 1) {
1146                 wpabuf_free(resp);
1147                 return eap_peer_tls_build_ack(id, EAP_TYPE_PEAP,
1148                                               data->peap_version);
1149         }
1150
1151         return resp;
1152 }
1153
1154
1155 static Boolean eap_peap_has_reauth_data(struct eap_sm *sm, void *priv)
1156 {
1157         struct eap_peap_data *data = priv;
1158         return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1159                 data->phase2_success;
1160 }
1161
1162
1163 static void eap_peap_deinit_for_reauth(struct eap_sm *sm, void *priv)
1164 {
1165         struct eap_peap_data *data = priv;
1166         wpabuf_free(data->pending_phase2_req);
1167         data->pending_phase2_req = NULL;
1168         data->crypto_binding_used = 0;
1169 }
1170
1171
1172 static void * eap_peap_init_for_reauth(struct eap_sm *sm, void *priv)
1173 {
1174         struct eap_peap_data *data = priv;
1175         os_free(data->key_data);
1176         data->key_data = NULL;
1177         if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1178                 os_free(data);
1179                 return NULL;
1180         }
1181         if (data->phase2_priv && data->phase2_method &&
1182             data->phase2_method->init_for_reauth)
1183                 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1184         data->phase2_success = 0;
1185         data->phase2_eap_success = 0;
1186         data->phase2_eap_started = 0;
1187         data->resuming = 1;
1188         sm->peap_done = FALSE;
1189         return priv;
1190 }
1191
1192
1193 static int eap_peap_get_status(struct eap_sm *sm, void *priv, char *buf,
1194                                size_t buflen, int verbose)
1195 {
1196         struct eap_peap_data *data = priv;
1197         int len, ret;
1198
1199         len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1200         if (data->phase2_method) {
1201                 ret = os_snprintf(buf + len, buflen - len,
1202                                   "EAP-PEAPv%d Phase2 method=%s\n",
1203                                   data->peap_version,
1204                                   data->phase2_method->name);
1205                 if (ret < 0 || (size_t) ret >= buflen - len)
1206                         return len;
1207                 len += ret;
1208         }
1209         return len;
1210 }
1211
1212
1213 static Boolean eap_peap_isKeyAvailable(struct eap_sm *sm, void *priv)
1214 {
1215         struct eap_peap_data *data = priv;
1216         return data->key_data != NULL && data->phase2_success;
1217 }
1218
1219
1220 static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
1221 {
1222         struct eap_peap_data *data = priv;
1223         u8 *key;
1224
1225         if (data->key_data == NULL || !data->phase2_success)
1226                 return NULL;
1227
1228         key = os_malloc(EAP_TLS_KEY_LEN);
1229         if (key == NULL)
1230                 return NULL;
1231
1232         *len = EAP_TLS_KEY_LEN;
1233
1234         if (data->crypto_binding_used) {
1235                 u8 csk[128];
1236                 /*
1237                  * Note: It looks like Microsoft implementation requires null
1238                  * termination for this label while the one used for deriving
1239                  * IPMK|CMK did not use null termination.
1240                  */
1241                 peap_prfplus(data->peap_version, data->ipmk, 40,
1242                              "Session Key Generating Function",
1243                              (u8 *) "\00", 1, csk, sizeof(csk));
1244                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
1245                 os_memcpy(key, csk, EAP_TLS_KEY_LEN);
1246                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1247                             key, EAP_TLS_KEY_LEN);
1248         } else
1249                 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1250
1251         return key;
1252 }
1253
1254
1255 int eap_peer_peap_register(void)
1256 {
1257         struct eap_method *eap;
1258         int ret;
1259
1260         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1261                                     EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
1262         if (eap == NULL)
1263                 return -1;
1264
1265         eap->init = eap_peap_init;
1266         eap->deinit = eap_peap_deinit;
1267         eap->process = eap_peap_process;
1268         eap->isKeyAvailable = eap_peap_isKeyAvailable;
1269         eap->getKey = eap_peap_getKey;
1270         eap->get_status = eap_peap_get_status;
1271         eap->has_reauth_data = eap_peap_has_reauth_data;
1272         eap->deinit_for_reauth = eap_peap_deinit_for_reauth;
1273         eap->init_for_reauth = eap_peap_init_for_reauth;
1274
1275         ret = eap_peer_method_register(eap);
1276         if (ret)
1277                 eap_peer_method_free(eap);
1278         return ret;
1279 }