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 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 "eap_common/eap_tlv_common.h"
  15 #include "eap_common/eap_peap_common.h"
  16 #include "eap_i.h"
  17 #include "eap_tls_common.h"
  18 #include "eap_config.h"
  19 #include "tncc.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  * 2 = draft-josefsson-ppext-eap-tls-eap-10.txt
  26  */
  27 #define EAP_PEAP_VERSION 1
  28
  29
  30 static void eap_peap_deinit(struct eap_sm *sm, void *priv);
  31
  32
  33 struct eap_peap_data {
  34         struct eap_ssl_data ssl;
  35
  36         int peap_version, force_peap_version, force_new_label;
  37
  38         const struct eap_method *phase2_method;
  39         void *phase2_priv;
  40         int phase2_success;
  41         int phase2_eap_success;
  42         int phase2_eap_started;
  43
  44         struct eap_method_type phase2_type;
  45         struct eap_method_type *phase2_types;
  46         size_t num_phase2_types;
  47
  48         int peap_outer_success; /* 0 = PEAP terminated on Phase 2 inner
  49                                  * EAP-Success
  50                                  * 1 = reply with tunneled EAP-Success to inner
  51                                  * EAP-Success and expect AS to send outer
  52                                  * (unencrypted) EAP-Success after this
  53                                  * 2 = reply with PEAP/TLS ACK to inner
  54                                  * EAP-Success and expect AS to send outer
  55                                  * (unencrypted) EAP-Success after this */
  56         int resuming; /* starting a resumed session */
  57         int reauth; /* reauthentication */
  58         u8 *key_data;
  59         u8 *session_id;
  60         size_t id_len;
  61
  62         struct wpabuf *pending_phase2_req;
  63         enum { NO_BINDING, OPTIONAL_BINDING, REQUIRE_BINDING } crypto_binding;
  64         int crypto_binding_used;
  65         u8 binding_nonce[32];
  66         u8 ipmk[40];
  67         u8 cmk[20];
  68         int soh; /* Whether IF-TNCCS-SOH (Statement of Health; Microsoft NAP)
  69                   * is enabled. */
  70 };
  71
  72
  73 static int eap_peap_parse_phase1(struct eap_peap_data *data,
  74                                  const char *phase1)
  75 {
  76         const char *pos;
  77
  78         pos = os_strstr(phase1, "peapver=");
  79         if (pos) {
  80                 data->force_peap_version = atoi(pos + 8);
  81                 data->peap_version = data->force_peap_version;
  82                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Forced PEAP version %d",
  83                            data->force_peap_version);
  84         }
  85
  86         if (os_strstr(phase1, "peaplabel=1")) {
  87                 data->force_new_label = 1;
  88                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Force new label for key "
  89                            "derivation");
  90         }
  91
  92         if (os_strstr(phase1, "peap_outer_success=0")) {
  93                 data->peap_outer_success = 0;
  94                 wpa_printf(MSG_DEBUG, "EAP-PEAP: terminate authentication on "
  95                            "tunneled EAP-Success");
  96         } else if (os_strstr(phase1, "peap_outer_success=1")) {
  97                 data->peap_outer_success = 1;
  98                 wpa_printf(MSG_DEBUG, "EAP-PEAP: send tunneled EAP-Success "
  99                            "after receiving tunneled EAP-Success");
 100         } else if (os_strstr(phase1, "peap_outer_success=2")) {
 101                 data->peap_outer_success = 2;
 102                 wpa_printf(MSG_DEBUG, "EAP-PEAP: send PEAP/TLS ACK after "
 103                            "receiving tunneled EAP-Success");
 104         }
 105
 106         if (os_strstr(phase1, "crypto_binding=0")) {
 107                 data->crypto_binding = NO_BINDING;
 108                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Do not use cryptobinding");
 109         } else if (os_strstr(phase1, "crypto_binding=1")) {
 110                 data->crypto_binding = OPTIONAL_BINDING;
 111                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Optional cryptobinding");
 112         } else if (os_strstr(phase1, "crypto_binding=2")) {
 113                 data->crypto_binding = REQUIRE_BINDING;
 114                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Require cryptobinding");
 115         }
 116
 117 #ifdef EAP_TNC
 118         if (os_strstr(phase1, "tnc=soh2")) {
 119                 data->soh = 2;
 120                 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
 121         } else if (os_strstr(phase1, "tnc=soh1")) {
 122                 data->soh = 1;
 123                 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 1 enabled");
 124         } else if (os_strstr(phase1, "tnc=soh")) {
 125                 data->soh = 2;
 126                 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
 127         }
 128 #endif /* EAP_TNC */
 129
 130         return 0;
 131 }
 132
 133
 134 static void * eap_peap_init(struct eap_sm *sm)
 135 {
 136         struct eap_peap_data *data;
 137         struct eap_peer_config *config = eap_get_config(sm);
 138
 139         data = os_zalloc(sizeof(*data));
 140         if (data == NULL)
 141                 return NULL;
 142         sm->peap_done = FALSE;
 143         data->peap_version = EAP_PEAP_VERSION;
 144         data->force_peap_version = -1;
 145         data->peap_outer_success = 2;
 146         data->crypto_binding = OPTIONAL_BINDING;
 147
 148         if (config && config->phase1 &&
 149             eap_peap_parse_phase1(data, config->phase1) < 0) {
 150                 eap_peap_deinit(sm, data);
 151                 return NULL;
 152         }
 153
 154         if (eap_peer_select_phase2_methods(config, "auth=",
 155                                            &data->phase2_types,
 156                                            &data->num_phase2_types) < 0) {
 157                 eap_peap_deinit(sm, data);
 158                 return NULL;
 159         }
 160
 161         data->phase2_type.vendor = EAP_VENDOR_IETF;
 162         data->phase2_type.method = EAP_TYPE_NONE;
 163
 164         if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_PEAP)) {
 165                 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
 166                 eap_peap_deinit(sm, data);
 167                 return NULL;
 168         }
 169
 170         return data;
 171 }
 172
 173
 174 static void eap_peap_deinit(struct eap_sm *sm, void *priv)
 175 {
 176         struct eap_peap_data *data = priv;
 177         if (data == NULL)
 178                 return;
 179         if (data->phase2_priv && data->phase2_method)
 180                 data->phase2_method->deinit(sm, data->phase2_priv);
 181         os_free(data->phase2_types);
 182         eap_peer_tls_ssl_deinit(sm, &data->ssl);
 183         os_free(data->key_data);
 184         os_free(data->session_id);
 185         wpabuf_free(data->pending_phase2_req);
 186         os_free(data);
 187 }
 188
 189
 190 /**
 191  * eap_tlv_build_nak - Build EAP-TLV NAK message
 192  * @id: EAP identifier for the header
 193  * @nak_type: TLV type (EAP_TLV_*)
 194  * Returns: Buffer to the allocated EAP-TLV NAK message or %NULL on failure
 195  *
 196  * This function builds an EAP-TLV NAK message. The caller is responsible for
 197  * freeing the returned buffer.
 198  */
 199 static struct wpabuf * eap_tlv_build_nak(int id, u16 nak_type)
 200 {
 201         struct wpabuf *msg;
 202
 203         msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, 10,
 204                             EAP_CODE_RESPONSE, id);
 205         if (msg == NULL)
 206                 return NULL;
 207
 208         wpabuf_put_u8(msg, 0x80); /* Mandatory */
 209         wpabuf_put_u8(msg, EAP_TLV_NAK_TLV);
 210         wpabuf_put_be16(msg, 6); /* Length */
 211         wpabuf_put_be32(msg, 0); /* Vendor-Id */
 212         wpabuf_put_be16(msg, nak_type); /* NAK-Type */
 213
 214         return msg;
 215 }
 216
 217
 218 static int eap_peap_get_isk(struct eap_sm *sm, struct eap_peap_data *data,
 219                             u8 *isk, size_t isk_len)
 220 {
 221         u8 *key;
 222         size_t key_len;
 223
 224         os_memset(isk, 0, isk_len);
 225         if (data->phase2_method == NULL || data->phase2_priv == NULL ||
 226             data->phase2_method->isKeyAvailable == NULL ||
 227             data->phase2_method->getKey == NULL)
 228                 return 0;
 229
 230         if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
 231             (key = data->phase2_method->getKey(sm, data->phase2_priv,
 232                                                &key_len)) == NULL) {
 233                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not get key material "
 234                            "from Phase 2");
 235                 return -1;
 236         }
 237
 238         if (key_len > isk_len)
 239                 key_len = isk_len;
 240         os_memcpy(isk, key, key_len);
 241         os_free(key);
 242
 243         return 0;
 244 }
 245
 246
 247 static int eap_peap_derive_cmk(struct eap_sm *sm, struct eap_peap_data *data)
 248 {
 249         u8 *tk;
 250         u8 isk[32], imck[60];
 251
 252         /*
 253          * Tunnel key (TK) is the first 60 octets of the key generated by
 254          * phase 1 of PEAP (based on TLS).
 255          */
 256         tk = data->key_data;
 257         if (tk == NULL)
 258                 return -1;
 259         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60);
 260
 261         if (data->reauth &&
 262             tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
 263                 /* Fast-connect: IPMK|CMK = TK */
 264                 os_memcpy(data->ipmk, tk, 40);
 265                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK from TK",
 266                                 data->ipmk, 40);
 267                 os_memcpy(data->cmk, tk + 40, 20);
 268                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK from TK",
 269                                 data->cmk, 20);
 270                 return 0;
 271         }
 272
 273         if (eap_peap_get_isk(sm, data, isk, sizeof(isk)) < 0)
 274                 return -1;
 275         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk));
 276
 277         /*
 278          * IPMK Seed = "Inner Methods Compound Keys" | ISK
 279          * TempKey = First 40 octets of TK
 280          * IPMK|CMK = PRF+(TempKey, IPMK Seed, 60)
 281          * (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space
 282          * in the end of the label just before ISK; is that just a typo?)
 283          */
 284         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40);
 285         if (peap_prfplus(data->peap_version, tk, 40,
 286                          "Inner Methods Compound Keys",
 287                          isk, sizeof(isk), imck, sizeof(imck)) < 0)
 288                 return -1;
 289         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
 290                         imck, sizeof(imck));
 291
 292         os_memcpy(data->ipmk, imck, 40);
 293         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
 294         os_memcpy(data->cmk, imck + 40, 20);
 295         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);
 296
 297         return 0;
 298 }
 299
 300
 301 static int eap_tlv_add_cryptobinding(struct eap_sm *sm,
 302                                      struct eap_peap_data *data,
 303                                      struct wpabuf *buf)
 304 {
 305         u8 *mac;
 306         u8 eap_type = EAP_TYPE_PEAP;
 307         const u8 *addr[2];
 308         size_t len[2];
 309         u16 tlv_type;
 310
 311         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
 312         addr[0] = wpabuf_put(buf, 0);
 313         len[0] = 60;
 314         addr[1] = &eap_type;
 315         len[1] = 1;
 316
 317         tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
 318         if (data->peap_version >= 2)
 319                 tlv_type |= EAP_TLV_TYPE_MANDATORY;
 320         wpabuf_put_be16(buf, tlv_type);
 321         wpabuf_put_be16(buf, 56);
 322
 323         wpabuf_put_u8(buf, 0); /* Reserved */
 324         wpabuf_put_u8(buf, data->peap_version); /* Version */
 325         wpabuf_put_u8(buf, data->peap_version); /* RecvVersion */
 326         wpabuf_put_u8(buf, 1); /* SubType: 0 = Request, 1 = Response */
 327         wpabuf_put_data(buf, data->binding_nonce, 32); /* Nonce */
 328         mac = wpabuf_put(buf, 20); /* Compound_MAC */
 329         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK", data->cmk, 20);
 330         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
 331                     addr[0], len[0]);
 332         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
 333                     addr[1], len[1]);
 334         hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac);
 335         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC", mac, SHA1_MAC_LEN);
 336         data->crypto_binding_used = 1;
 337
 338         return 0;
 339 }
 340
 341
 342 /**
 343  * eap_tlv_build_result - Build EAP-TLV Result message
 344  * @id: EAP identifier for the header
 345  * @status: Status (EAP_TLV_RESULT_SUCCESS or EAP_TLV_RESULT_FAILURE)
 346  * Returns: Buffer to the allocated EAP-TLV Result message or %NULL on failure
 347  *
 348  * This function builds an EAP-TLV Result message. The caller is responsible
 349  * for freeing the returned buffer.
 350  */
 351 static struct wpabuf * eap_tlv_build_result(struct eap_sm *sm,
 352                                             struct eap_peap_data *data,
 353                                             int crypto_tlv_used,
 354                                             int id, u16 status)
 355 {
 356         struct wpabuf *msg;
 357         size_t len;
 358
 359         if (data->crypto_binding == NO_BINDING)
 360                 crypto_tlv_used = 0;
 361
 362         len = 6;
 363         if (crypto_tlv_used)
 364                 len += 60; /* Cryptobinding TLV */
 365         msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len,
 366                             EAP_CODE_RESPONSE, id);
 367         if (msg == NULL)
 368                 return NULL;
 369
 370         wpabuf_put_u8(msg, 0x80); /* Mandatory */
 371         wpabuf_put_u8(msg, EAP_TLV_RESULT_TLV);
 372         wpabuf_put_be16(msg, 2); /* Length */
 373         wpabuf_put_be16(msg, status); /* Status */
 374
 375         if (crypto_tlv_used && eap_tlv_add_cryptobinding(sm, data, msg)) {
 376                 wpabuf_free(msg);
 377                 return NULL;
 378         }
 379
 380         return msg;
 381 }
 382
 383
 384 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
 385                                           struct eap_peap_data *data,
 386                                           const u8 *crypto_tlv,
 387                                           size_t crypto_tlv_len)
 388 {
 389         u8 buf[61], mac[SHA1_MAC_LEN];
 390         const u8 *pos;
 391
 392         if (eap_peap_derive_cmk(sm, data) < 0) {
 393                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not derive CMK");
 394                 return -1;
 395         }
 396
 397         if (crypto_tlv_len != 4 + 56) {
 398                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
 399                            "length %d", (int) crypto_tlv_len);
 400                 return -1;
 401         }
 402
 403         pos = crypto_tlv;
 404         pos += 4; /* TLV header */
 405         if (pos[1] != data->peap_version) {
 406                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
 407                            "mismatch (was %d; expected %d)",
 408                            pos[1], data->peap_version);
 409                 return -1;
 410         }
 411
 412         if (pos[3] != 0) {
 413                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
 414                            "SubType %d", pos[3]);
 415                 return -1;
 416         }
 417         pos += 4;
 418         os_memcpy(data->binding_nonce, pos, 32);
 419         pos += 32; /* Nonce */
 420
 421         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
 422         os_memcpy(buf, crypto_tlv, 60);
 423         os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
 424         buf[60] = EAP_TYPE_PEAP;
 425         wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Compound_MAC data",
 426                     buf, sizeof(buf));
 427         hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
 428
 429         if (os_memcmp(mac, pos, SHA1_MAC_LEN) != 0) {
 430                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
 431                            "cryptobinding TLV");
 432                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received MAC",
 433                             pos, SHA1_MAC_LEN);
 434                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Expected MAC",
 435                             mac, SHA1_MAC_LEN);
 436                 return -1;
 437         }
 438
 439         wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
 440
 441         return 0;
 442 }
 443
 444
 445 /**
 446  * eap_tlv_process - Process a received EAP-TLV message and generate a response
 447  * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
 448  * @ret: Return values from EAP request validation and processing
 449  * @req: EAP-TLV request to be processed. The caller must have validated that
 450  * the buffer is large enough to contain full request (hdr->length bytes) and
 451  * that the EAP type is EAP_TYPE_TLV.
 452  * @resp: Buffer to return a pointer to the allocated response message. This
 453  * field should be initialized to %NULL before the call. The value will be
 454  * updated if a response message is generated. The caller is responsible for
 455  * freeing the allocated message.
 456  * @force_failure: Force negotiation to fail
 457  * Returns: 0 on success, -1 on failure
 458  */
 459 static int eap_tlv_process(struct eap_sm *sm, struct eap_peap_data *data,
 460                            struct eap_method_ret *ret,
 461                            const struct wpabuf *req, struct wpabuf **resp,
 462                            int force_failure)
 463 {
 464         size_t left, tlv_len;
 465         const u8 *pos;
 466         const u8 *result_tlv = NULL, *crypto_tlv = NULL;
 467         size_t result_tlv_len = 0, crypto_tlv_len = 0;
 468         int tlv_type, mandatory;
 469
 470         /* Parse TLVs */
 471         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, req, &left);
 472         if (pos == NULL)
 473                 return -1;
 474         wpa_hexdump(MSG_DEBUG, "EAP-TLV: Received TLVs", pos, left);
 475         while (left >= 4) {
 476                 mandatory = !!(pos[0] & 0x80);
 477                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
 478                 pos += 2;
 479                 tlv_len = WPA_GET_BE16(pos);
 480                 pos += 2;
 481                 left -= 4;
 482                 if (tlv_len > left) {
 483                         wpa_printf(MSG_DEBUG, "EAP-TLV: TLV underrun "
 484                                    "(tlv_len=%lu left=%lu)",
 485                                    (unsigned long) tlv_len,
 486                                    (unsigned long) left);
 487                         return -1;
 488                 }
 489                 switch (tlv_type) {
 490                 case EAP_TLV_RESULT_TLV:
 491                         result_tlv = pos;
 492                         result_tlv_len = tlv_len;
 493                         break;
 494                 case EAP_TLV_CRYPTO_BINDING_TLV:
 495                         crypto_tlv = pos;
 496                         crypto_tlv_len = tlv_len;
 497                         break;
 498                 default:
 499                         wpa_printf(MSG_DEBUG, "EAP-TLV: Unsupported TLV Type "
 500                                    "%d%s", tlv_type,
 501                                    mandatory ? " (mandatory)" : "");
 502                         if (mandatory) {
 503                                 /* NAK TLV and ignore all TLVs in this packet.
 504                                  */
 505                                 *resp = eap_tlv_build_nak(eap_get_id(req),
 506                                                           tlv_type);
 507                                 return *resp == NULL ? -1 : 0;
 508                         }
 509                         /* Ignore this TLV, but process other TLVs */
 510                         break;
 511                 }
 512
 513                 pos += tlv_len;
 514                 left -= tlv_len;
 515         }
 516         if (left) {
 517                 wpa_printf(MSG_DEBUG, "EAP-TLV: Last TLV too short in "
 518                            "Request (left=%lu)", (unsigned long) left);
 519                 return -1;
 520         }
 521
 522         /* Process supported TLVs */
 523         if (crypto_tlv && data->crypto_binding != NO_BINDING) {
 524                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
 525                             crypto_tlv, crypto_tlv_len);
 526                 if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
 527                                                    crypto_tlv_len + 4) < 0) {
 528                         if (result_tlv == NULL)
 529                                 return -1;
 530                         force_failure = 1;
 531                         crypto_tlv = NULL; /* do not include Cryptobinding TLV
 532                                             * in response, if the received
 533                                             * cryptobinding was invalid. */
 534                 }
 535         } else if (!crypto_tlv && data->crypto_binding == REQUIRE_BINDING) {
 536                 wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
 537                 return -1;
 538         }
 539
 540         if (result_tlv) {
 541                 int status, resp_status;
 542                 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Result TLV",
 543                             result_tlv, result_tlv_len);
 544                 if (result_tlv_len < 2) {
 545                         wpa_printf(MSG_INFO, "EAP-TLV: Too short Result TLV "
 546                                    "(len=%lu)",
 547                                    (unsigned long) result_tlv_len);
 548                         return -1;
 549                 }
 550                 status = WPA_GET_BE16(result_tlv);
 551                 if (status == EAP_TLV_RESULT_SUCCESS) {
 552                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Success "
 553                                    "- EAP-TLV/Phase2 Completed");
 554                         if (force_failure) {
 555                                 wpa_printf(MSG_INFO, "EAP-TLV: Earlier failure"
 556                                            " - force failed Phase 2");
 557                                 resp_status = EAP_TLV_RESULT_FAILURE;
 558                                 ret->decision = DECISION_FAIL;
 559                         } else {
 560                                 resp_status = EAP_TLV_RESULT_SUCCESS;
 561                                 ret->decision = DECISION_UNCOND_SUCC;
 562                         }
 563                 } else if (status == EAP_TLV_RESULT_FAILURE) {
 564                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Failure");
 565                         resp_status = EAP_TLV_RESULT_FAILURE;
 566                         ret->decision = DECISION_FAIL;
 567                 } else {
 568                         wpa_printf(MSG_INFO, "EAP-TLV: Unknown TLV Result "
 569                                    "Status %d", status);
 570                         resp_status = EAP_TLV_RESULT_FAILURE;
 571                         ret->decision = DECISION_FAIL;
 572                 }
 573                 ret->methodState = METHOD_DONE;
 574
 575                 *resp = eap_tlv_build_result(sm, data, crypto_tlv != NULL,
 576                                              eap_get_id(req), resp_status);
 577         }
 578
 579         return 0;
 580 }
 581
 582
 583 static struct wpabuf * eap_peapv2_tlv_eap_payload(struct wpabuf *buf)
 584 {
 585         struct wpabuf *e;
 586         struct eap_tlv_hdr *tlv;
 587
 588         if (buf == NULL)
 589                 return NULL;
 590
 591         /* Encapsulate EAP packet in EAP-Payload TLV */
 592         wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Add EAP-Payload TLV");
 593         e = wpabuf_alloc(sizeof(*tlv) + wpabuf_len(buf));
 594         if (e == NULL) {
 595                 wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Failed to allocate memory "
 596                            "for TLV encapsulation");
 597                 wpabuf_free(buf);
 598                 return NULL;
 599         }
 600         tlv = wpabuf_put(e, sizeof(*tlv));
 601         tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 602                                      EAP_TLV_EAP_PAYLOAD_TLV);
 603         tlv->length = host_to_be16(wpabuf_len(buf));
 604         wpabuf_put_buf(e, buf);
 605         wpabuf_free(buf);
 606         return e;
 607 }
 608
 609
 610 static int eap_peap_phase2_request(struct eap_sm *sm,
 611                                    struct eap_peap_data *data,
 612                                    struct eap_method_ret *ret,
 613                                    struct wpabuf *req,
 614                                    struct wpabuf **resp)
 615 {
 616         struct eap_hdr *hdr = wpabuf_mhead(req);
 617         size_t len = be_to_host16(hdr->length);
 618         u8 *pos;
 619         struct eap_method_ret iret;
 620         struct eap_peer_config *config = eap_get_config(sm);
 621
 622         if (len <= sizeof(struct eap_hdr)) {
 623                 wpa_printf(MSG_INFO, "EAP-PEAP: too short "
 624                            "Phase 2 request (len=%lu)", (unsigned long) len);
 625                 return -1;
 626         }
 627         pos = (u8 *) (hdr + 1);
 628         wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Request: type=%d", *pos);
 629         switch (*pos) {
 630         case EAP_TYPE_IDENTITY:
 631                 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
 632                 break;
 633         case EAP_TYPE_TLV:
 634                 os_memset(&iret, 0, sizeof(iret));
 635                 if (eap_tlv_process(sm, data, &iret, req, resp,
 636                                     data->phase2_eap_started &&
 637                                     !data->phase2_eap_success)) {
 638                         ret->methodState = METHOD_DONE;
 639                         ret->decision = DECISION_FAIL;
 640                         return -1;
 641                 }
 642                 if (iret.methodState == METHOD_DONE ||
 643                     iret.methodState == METHOD_MAY_CONT) {
 644                         ret->methodState = iret.methodState;
 645                         ret->decision = iret.decision;
 646                         data->phase2_success = 1;
 647                 }
 648                 break;
 649         case EAP_TYPE_EXPANDED:
 650 #ifdef EAP_TNC
 651                 if (data->soh) {
 652                         const u8 *epos;
 653                         size_t eleft;
 654
 655                         epos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21,
 656                                                 req, &eleft);
 657                         if (epos) {
 658                                 struct wpabuf *buf;
 659                                 wpa_printf(MSG_DEBUG,
 660                                            "EAP-PEAP: SoH EAP Extensions");
 661                                 buf = tncc_process_soh_request(data->soh,
 662                                                                epos, eleft);
 663                                 if (buf) {
 664                                         *resp = eap_msg_alloc(
 665                                                 EAP_VENDOR_MICROSOFT, 0x21,
 666                                                 wpabuf_len(buf),
 667                                                 EAP_CODE_RESPONSE,
 668                                                 hdr->identifier);
 669                                         if (*resp == NULL) {
 670                                                 ret->methodState = METHOD_DONE;
 671                                                 ret->decision = DECISION_FAIL;
 672                                                 return -1;
 673                                         }
 674                                         wpabuf_put_buf(*resp, buf);
 675                                         wpabuf_free(buf);
 676                                         break;
 677                                 }
 678                         }
 679                 }
 680 #endif /* EAP_TNC */
 681                 /* fall through */
 682         default:
 683                 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
 684                     data->phase2_type.method == EAP_TYPE_NONE) {
 685                         size_t i;
 686                         for (i = 0; i < data->num_phase2_types; i++) {
 687                                 if (data->phase2_types[i].vendor !=
 688                                     EAP_VENDOR_IETF ||
 689                                     data->phase2_types[i].method != *pos)
 690                                         continue;
 691
 692                                 data->phase2_type.vendor =
 693                                         data->phase2_types[i].vendor;
 694                                 data->phase2_type.method =
 695                                         data->phase2_types[i].method;
 696                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Selected "
 697                                            "Phase 2 EAP vendor %d method %d",
 698                                            data->phase2_type.vendor,
 699                                            data->phase2_type.method);
 700                                 break;
 701                         }
 702                 }
 703                 if (*pos != data->phase2_type.method ||
 704                     *pos == EAP_TYPE_NONE) {
 705                         if (eap_peer_tls_phase2_nak(data->phase2_types,
 706                                                     data->num_phase2_types,
 707                                                     hdr, resp))
 708                                 return -1;
 709                         return 0;
 710                 }
 711
 712                 if (data->phase2_priv == NULL) {
 713                         data->phase2_method = eap_peer_get_eap_method(
 714                                 data->phase2_type.vendor,
 715                                 data->phase2_type.method);
 716                         if (data->phase2_method) {
 717                                 sm->init_phase2 = 1;
 718                                 data->phase2_priv =
 719                                         data->phase2_method->init(sm);
 720                                 sm->init_phase2 = 0;
 721                         }
 722                 }
 723                 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
 724                         wpa_printf(MSG_INFO, "EAP-PEAP: failed to initialize "
 725                                    "Phase 2 EAP method %d", *pos);
 726                         ret->methodState = METHOD_DONE;
 727                         ret->decision = DECISION_FAIL;
 728                         return -1;
 729                 }
 730                 data->phase2_eap_started = 1;
 731                 os_memset(&iret, 0, sizeof(iret));
 732                 *resp = data->phase2_method->process(sm, data->phase2_priv,
 733                                                      &iret, req);
 734                 if ((iret.methodState == METHOD_DONE ||
 735                      iret.methodState == METHOD_MAY_CONT) &&
 736                     (iret.decision == DECISION_UNCOND_SUCC ||
 737                      iret.decision == DECISION_COND_SUCC)) {
 738                         data->phase2_eap_success = 1;
 739                         data->phase2_success = 1;
 740                 }
 741                 break;
 742         }
 743
 744         if (*resp == NULL &&
 745             (config->pending_req_identity || config->pending_req_password ||
 746              config->pending_req_otp || config->pending_req_new_password)) {
 747                 wpabuf_free(data->pending_phase2_req);
 748                 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
 749         }
 750
 751         return 0;
 752 }
 753
 754
 755 static int eap_peap_decrypt(struct eap_sm *sm, struct eap_peap_data *data,
 756                             struct eap_method_ret *ret,
 757                             const struct eap_hdr *req,
 758                             const struct wpabuf *in_data,
 759                             struct wpabuf **out_data)
 760 {
 761         struct wpabuf *in_decrypted = NULL;
 762         int res, skip_change = 0;
 763         struct eap_hdr *hdr, *rhdr;
 764         struct wpabuf *resp = NULL;
 765         size_t len;
 766
 767         wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
 768                    " Phase 2", (unsigned long) wpabuf_len(in_data));
 769
 770         if (data->pending_phase2_req) {
 771                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 request - "
 772                            "skip decryption and use old data");
 773                 /* Clear TLS reassembly state. */
 774                 eap_peer_tls_reset_input(&data->ssl);
 775                 in_decrypted = data->pending_phase2_req;
 776                 data->pending_phase2_req = NULL;
 777                 skip_change = 1;
 778                 goto continue_req;
 779         }
 780
 781         if (wpabuf_len(in_data) == 0 && sm->workaround &&
 782             data->phase2_success) {
 783                 /*
 784                  * Cisco ACS seems to be using TLS ACK to terminate
 785                  * EAP-PEAPv0/GTC. Try to reply with TLS ACK.
 786                  */
 787                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Received TLS ACK, but "
 788                            "expected data - acknowledge with TLS ACK since "
 789                            "Phase 2 has been completed");
 790                 ret->decision = DECISION_COND_SUCC;
 791                 ret->methodState = METHOD_DONE;
 792                 return 1;
 793         } else if (wpabuf_len(in_data) == 0) {
 794                 /* Received TLS ACK - requesting more fragments */
 795                 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
 796                                             data->peap_version,
 797                                             req->identifier, NULL, out_data);
 798         }
 799
 800         res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
 801         if (res)
 802                 return res;
 803
 804 continue_req:
 805         wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
 806                         in_decrypted);
 807
 808         hdr = wpabuf_mhead(in_decrypted);
 809         if (wpabuf_len(in_decrypted) == 5 && hdr->code == EAP_CODE_REQUEST &&
 810             be_to_host16(hdr->length) == 5 &&
 811             eap_get_type(in_decrypted) == EAP_TYPE_IDENTITY) {
 812                 /* At least FreeRADIUS seems to send full EAP header with
 813                  * EAP Request Identity */
 814                 skip_change = 1;
 815         }
 816         if (wpabuf_len(in_decrypted) >= 5 && hdr->code == EAP_CODE_REQUEST &&
 817             eap_get_type(in_decrypted) == EAP_TYPE_TLV) {
 818                 skip_change = 1;
 819         }
 820
 821         if (data->peap_version == 0 && !skip_change) {
 822                 struct eap_hdr *nhdr;
 823                 struct wpabuf *nmsg = wpabuf_alloc(sizeof(struct eap_hdr) +
 824                                                    wpabuf_len(in_decrypted));
 825                 if (nmsg == NULL) {
 826                         wpabuf_free(in_decrypted);
 827                         return 0;
 828                 }
 829                 nhdr = wpabuf_put(nmsg, sizeof(*nhdr));
 830                 wpabuf_put_buf(nmsg, in_decrypted);
 831                 nhdr->code = req->code;
 832                 nhdr->identifier = req->identifier;
 833                 nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
 834                                             wpabuf_len(in_decrypted));
 835
 836                 wpabuf_free(in_decrypted);
 837                 in_decrypted = nmsg;
 838         }
 839
 840         if (data->peap_version >= 2) {
 841                 struct eap_tlv_hdr *tlv;
 842                 struct wpabuf *nmsg;
 843
 844                 if (wpabuf_len(in_decrypted) < sizeof(*tlv) + sizeof(*hdr)) {
 845                         wpa_printf(MSG_INFO, "EAP-PEAPv2: Too short Phase 2 "
 846                                    "EAP TLV");
 847                         wpabuf_free(in_decrypted);
 848                         return 0;
 849                 }
 850                 tlv = wpabuf_mhead(in_decrypted);
 851                 if ((be_to_host16(tlv->tlv_type) & 0x3fff) !=
 852                     EAP_TLV_EAP_PAYLOAD_TLV) {
 853                         wpa_printf(MSG_INFO, "EAP-PEAPv2: Not an EAP TLV");
 854                         wpabuf_free(in_decrypted);
 855                         return 0;
 856                 }
 857                 if (sizeof(*tlv) + be_to_host16(tlv->length) >
 858                     wpabuf_len(in_decrypted)) {
 859                         wpa_printf(MSG_INFO, "EAP-PEAPv2: Invalid EAP TLV "
 860                                    "length");
 861                         wpabuf_free(in_decrypted);
 862                         return 0;
 863                 }
 864                 hdr = (struct eap_hdr *) (tlv + 1);
 865                 if (be_to_host16(hdr->length) > be_to_host16(tlv->length)) {
 866                         wpa_printf(MSG_INFO, "EAP-PEAPv2: No room for full "
 867                                    "EAP packet in EAP TLV");
 868                         wpabuf_free(in_decrypted);
 869                         return 0;
 870                 }
 871
 872                 nmsg = wpabuf_alloc(be_to_host16(hdr->length));
 873                 if (nmsg == NULL) {
 874                         wpabuf_free(in_decrypted);
 875                         return 0;
 876                 }
 877
 878                 wpabuf_put_data(nmsg, hdr, be_to_host16(hdr->length));
 879                 wpabuf_free(in_decrypted);
 880                 in_decrypted = nmsg;
 881         }
 882
 883         hdr = wpabuf_mhead(in_decrypted);
 884         if (wpabuf_len(in_decrypted) < sizeof(*hdr)) {
 885                 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
 886                            "EAP frame (len=%lu)",
 887                            (unsigned long) wpabuf_len(in_decrypted));
 888                 wpabuf_free(in_decrypted);
 889                 return 0;
 890         }
 891         len = be_to_host16(hdr->length);
 892         if (len > wpabuf_len(in_decrypted)) {
 893                 wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
 894                            "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
 895                            (unsigned long) wpabuf_len(in_decrypted),
 896                            (unsigned long) len);
 897                 wpabuf_free(in_decrypted);
 898                 return 0;
 899         }
 900         if (len < wpabuf_len(in_decrypted)) {
 901                 wpa_printf(MSG_INFO, "EAP-PEAP: Odd.. Phase 2 EAP header has "
 902                            "shorter length than full decrypted data "
 903                            "(%lu < %lu)",
 904                            (unsigned long) len,
 905                            (unsigned long) wpabuf_len(in_decrypted));
 906         }
 907         wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
 908                    "identifier=%d length=%lu", hdr->code, hdr->identifier,
 909                    (unsigned long) len);
 910         switch (hdr->code) {
 911         case EAP_CODE_REQUEST:
 912                 if (eap_peap_phase2_request(sm, data, ret, in_decrypted,
 913                                             &resp)) {
 914                         wpabuf_free(in_decrypted);
 915                         wpa_printf(MSG_INFO, "EAP-PEAP: Phase2 Request "
 916                                    "processing failed");
 917                         return 0;
 918                 }
 919                 break;
 920         case EAP_CODE_SUCCESS:
 921                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
 922                 if (data->peap_version == 1) {
 923                         /* EAP-Success within TLS tunnel is used to indicate
 924                          * shutdown of the TLS channel. The authentication has
 925                          * been completed. */
 926                         if (data->phase2_eap_started &&
 927                             !data->phase2_eap_success) {
 928                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 "
 929                                            "Success used to indicate success, "
 930                                            "but Phase 2 EAP was not yet "
 931                                            "completed successfully");
 932                                 ret->methodState = METHOD_DONE;
 933                                 ret->decision = DECISION_FAIL;
 934                                 wpabuf_free(in_decrypted);
 935                                 return 0;
 936                         }
 937                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - "
 938                                    "EAP-Success within TLS tunnel - "
 939                                    "authentication completed");
 940                         ret->decision = DECISION_UNCOND_SUCC;
 941                         ret->methodState = METHOD_DONE;
 942                         data->phase2_success = 1;
 943                         if (data->peap_outer_success == 2) {
 944                                 wpabuf_free(in_decrypted);
 945                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK "
 946                                            "to finish authentication");
 947                                 return 1;
 948                         } else if (data->peap_outer_success == 1) {
 949                                 /* Reply with EAP-Success within the TLS
 950                                  * channel to complete the authentication. */
 951                                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
 952                                 if (resp) {
 953                                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
 954                                         rhdr->code = EAP_CODE_SUCCESS;
 955                                         rhdr->identifier = hdr->identifier;
 956                                         rhdr->length =
 957                                                 host_to_be16(sizeof(*rhdr));
 958                                 }
 959                         } else {
 960                                 /* No EAP-Success expected for Phase 1 (outer,
 961                                  * unencrypted auth), so force EAP state
 962                                  * machine to SUCCESS state. */
 963                                 sm->peap_done = TRUE;
 964                         }
 965                 } else {
 966                         /* FIX: ? */
 967                 }
 968                 break;
 969         case EAP_CODE_FAILURE:
 970                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
 971                 ret->decision = DECISION_FAIL;
 972                 ret->methodState = METHOD_MAY_CONT;
 973                 ret->allowNotifications = FALSE;
 974                 /* Reply with EAP-Failure within the TLS channel to complete
 975                  * failure reporting. */
 976                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
 977                 if (resp) {
 978                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
 979                         rhdr->code = EAP_CODE_FAILURE;
 980                         rhdr->identifier = hdr->identifier;
 981                         rhdr->length = host_to_be16(sizeof(*rhdr));
 982                 }
 983                 break;
 984         default:
 985                 wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
 986                            "Phase 2 EAP header", hdr->code);
 987                 break;
 988         }
 989
 990         wpabuf_free(in_decrypted);
 991
 992         if (resp) {
 993                 int skip_change2 = 0;
 994                 struct wpabuf *rmsg, buf;
 995
 996                 wpa_hexdump_buf_key(MSG_DEBUG,
 997                                     "EAP-PEAP: Encrypting Phase 2 data", resp);
 998                 /* PEAP version changes */
 999                 if (data->peap_version >= 2) {
1000                         resp = eap_peapv2_tlv_eap_payload(resp);
1001                         if (resp == NULL)
1002                                 return -1;
1003                 }
1004                 if (wpabuf_len(resp) >= 5 &&
1005                     wpabuf_head_u8(resp)[0] == EAP_CODE_RESPONSE &&
1006                     eap_get_type(resp) == EAP_TYPE_TLV)
1007                         skip_change2 = 1;
1008                 rmsg = resp;
1009                 if (data->peap_version == 0 && !skip_change2) {
1010                         wpabuf_set(&buf, wpabuf_head_u8(resp) +
1011                                    sizeof(struct eap_hdr),
1012                                    wpabuf_len(resp) - sizeof(struct eap_hdr));
1013                         rmsg = &buf;
1014                 }
1015
1016                 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
1017                                          data->peap_version, req->identifier,
1018                                          rmsg, out_data)) {
1019                         wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt "
1020                                    "a Phase 2 frame");
1021                 }
1022                 wpabuf_free(resp);
1023         }
1024
1025         return 0;
1026 }
1027
1028
1029 static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
1030                                         struct eap_method_ret *ret,
1031                                         const struct wpabuf *reqData)
1032 {
1033         const struct eap_hdr *req;
1034         size_t left;
1035         int res;
1036         u8 flags, id;
1037         struct wpabuf *resp;
1038         const u8 *pos;
1039         struct eap_peap_data *data = priv;
1040
1041         pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret,
1042                                         reqData, &left, &flags);
1043         if (pos == NULL)
1044                 return NULL;
1045         req = wpabuf_head(reqData);
1046         id = req->identifier;
1047
1048         if (flags & EAP_TLS_FLAGS_START) {
1049                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Start (server ver=%d, own "
1050                            "ver=%d)", flags & EAP_TLS_VERSION_MASK,
1051                         data->peap_version);
1052                 if ((flags & EAP_TLS_VERSION_MASK) < data->peap_version)
1053                         data->peap_version = flags & EAP_TLS_VERSION_MASK;
1054                 if (data->force_peap_version >= 0 &&
1055                     data->force_peap_version != data->peap_version) {
1056                         wpa_printf(MSG_WARNING, "EAP-PEAP: Failed to select "
1057                                    "forced PEAP version %d",
1058                                    data->force_peap_version);
1059                         ret->methodState = METHOD_DONE;
1060                         ret->decision = DECISION_FAIL;
1061                         ret->allowNotifications = FALSE;
1062                         return NULL;
1063                 }
1064                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Using PEAP version %d",
1065                            data->peap_version);
1066                 left = 0; /* make sure that this frame is empty, even though it
1067                            * should always be, anyway */
1068         }
1069
1070         resp = NULL;
1071         if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1072             !data->resuming) {
1073                 struct wpabuf msg;
1074                 wpabuf_set(&msg, pos, left);
1075                 res = eap_peap_decrypt(sm, data, ret, req, &msg, &resp);
1076         } else {
1077                 res = eap_peer_tls_process_helper(sm, &data->ssl,
1078                                                   EAP_TYPE_PEAP,
1079                                                   data->peap_version, id, pos,
1080                                                   left, &resp);
1081
1082                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1083                         char *label;
1084                         wpa_printf(MSG_DEBUG,
1085                                    "EAP-PEAP: TLS done, proceed to Phase 2");
1086                         os_free(data->key_data);
1087                         /* draft-josefsson-ppext-eap-tls-eap-05.txt
1088                          * specifies that PEAPv1 would use "client PEAP
1089                          * encryption" as the label. However, most existing
1090                          * PEAPv1 implementations seem to be using the old
1091                          * label, "client EAP encryption", instead. Use the old
1092                          * label by default, but allow it to be configured with
1093                          * phase1 parameter peaplabel=1. */
1094                         if (data->peap_version > 1 || data->force_new_label)
1095                                 label = "client PEAP encryption";
1096                         else
1097                                 label = "client EAP encryption";
1098                         wpa_printf(MSG_DEBUG, "EAP-PEAP: using label '%s' in "
1099                                    "key derivation", label);
1100                         data->key_data =
1101                                 eap_peer_tls_derive_key(sm, &data->ssl, label,
1102                                                         EAP_TLS_KEY_LEN);
1103                         if (data->key_data) {
1104                                 wpa_hexdump_key(MSG_DEBUG,
1105                                                 "EAP-PEAP: Derived key",
1106                                                 data->key_data,
1107                                                 EAP_TLS_KEY_LEN);
1108                         } else {
1109                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to "
1110                                            "derive key");
1111                         }
1112
1113                         os_free(data->session_id);
1114                         data->session_id =
1115                                 eap_peer_tls_derive_session_id(sm, &data->ssl,
1116                                                                EAP_TYPE_PEAP,
1117                                                                &data->id_len);
1118                         if (data->session_id) {
1119                                 wpa_hexdump(MSG_DEBUG,
1120                                             "EAP-PEAP: Derived Session-Id",
1121                                             data->session_id, data->id_len);
1122                         } else {
1123                                 wpa_printf(MSG_ERROR, "EAP-PEAP: Failed to "
1124                                            "derive Session-Id");
1125                         }
1126
1127                         if (sm->workaround && data->resuming) {
1128                                 /*
1129                                  * At least few RADIUS servers (Aegis v1.1.6;
1130                                  * but not v1.1.4; and Cisco ACS) seem to be
1131                                  * terminating PEAPv1 (Aegis) or PEAPv0 (Cisco
1132                                  * ACS) session resumption with outer
1133                                  * EAP-Success. This does not seem to follow
1134                                  * draft-josefsson-pppext-eap-tls-eap-05.txt
1135                                  * section 4.2, so only allow this if EAP
1136                                  * workarounds are enabled.
1137                                  */
1138                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Workaround - "
1139                                            "allow outer EAP-Success to "
1140                                            "terminate PEAP resumption");
1141                                 ret->decision = DECISION_COND_SUCC;
1142                                 data->phase2_success = 1;
1143                         }
1144
1145                         data->resuming = 0;
1146                 }
1147
1148                 if (res == 2) {
1149                         struct wpabuf msg;
1150                         /*
1151                          * Application data included in the handshake message.
1152                          */
1153                         wpabuf_free(data->pending_phase2_req);
1154                         data->pending_phase2_req = resp;
1155                         resp = NULL;
1156                         wpabuf_set(&msg, pos, left);
1157                         res = eap_peap_decrypt(sm, data, ret, req, &msg,
1158                                                &resp);
1159                 }
1160         }
1161
1162         if (ret->methodState == METHOD_DONE) {
1163                 ret->allowNotifications = FALSE;
1164         }
1165
1166         if (res == 1) {
1167                 wpabuf_free(resp);
1168                 return eap_peer_tls_build_ack(id, EAP_TYPE_PEAP,
1169                                               data->peap_version);
1170         }
1171
1172         return resp;
1173 }
1174
1175
1176 static Boolean eap_peap_has_reauth_data(struct eap_sm *sm, void *priv)
1177 {
1178         struct eap_peap_data *data = priv;
1179         return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1180                 data->phase2_success;
1181 }
1182
1183
1184 static void eap_peap_deinit_for_reauth(struct eap_sm *sm, void *priv)
1185 {
1186         struct eap_peap_data *data = priv;
1187         wpabuf_free(data->pending_phase2_req);
1188         data->pending_phase2_req = NULL;
1189         data->crypto_binding_used = 0;
1190 }
1191
1192
1193 static void * eap_peap_init_for_reauth(struct eap_sm *sm, void *priv)
1194 {
1195         struct eap_peap_data *data = priv;
1196         os_free(data->key_data);
1197         data->key_data = NULL;
1198         os_free(data->session_id);
1199         data->session_id = NULL;
1200         if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1201                 os_free(data);
1202                 return NULL;
1203         }
1204         if (data->phase2_priv && data->phase2_method &&
1205             data->phase2_method->init_for_reauth)
1206                 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1207         data->phase2_success = 0;
1208         data->phase2_eap_success = 0;
1209         data->phase2_eap_started = 0;
1210         data->resuming = 1;
1211         data->reauth = 1;
1212         sm->peap_done = FALSE;
1213         return priv;
1214 }
1215
1216
1217 static int eap_peap_get_status(struct eap_sm *sm, void *priv, char *buf,
1218                                size_t buflen, int verbose)
1219 {
1220         struct eap_peap_data *data = priv;
1221         int len, ret;
1222
1223         len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1224         if (data->phase2_method) {
1225                 ret = os_snprintf(buf + len, buflen - len,
1226                                   "EAP-PEAPv%d Phase2 method=%s\n",
1227                                   data->peap_version,
1228                                   data->phase2_method->name);
1229                 if (ret < 0 || (size_t) ret >= buflen - len)
1230                         return len;
1231                 len += ret;
1232         }
1233         return len;
1234 }
1235
1236
1237 static Boolean eap_peap_isKeyAvailable(struct eap_sm *sm, void *priv)
1238 {
1239         struct eap_peap_data *data = priv;
1240         return data->key_data != NULL && data->phase2_success;
1241 }
1242
1243
1244 static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
1245 {
1246         struct eap_peap_data *data = priv;
1247         u8 *key;
1248
1249         if (data->key_data == NULL || !data->phase2_success)
1250                 return NULL;
1251
1252         key = os_malloc(EAP_TLS_KEY_LEN);
1253         if (key == NULL)
1254                 return NULL;
1255
1256         *len = EAP_TLS_KEY_LEN;
1257
1258         if (data->crypto_binding_used) {
1259                 u8 csk[128];
1260                 /*
1261                  * Note: It looks like Microsoft implementation requires null
1262                  * termination for this label while the one used for deriving
1263                  * IPMK|CMK did not use null termination.
1264                  */
1265                 if (peap_prfplus(data->peap_version, data->ipmk, 40,
1266                                  "Session Key Generating Function",
1267                                  (u8 *) "\00", 1, csk, sizeof(csk)) < 0) {
1268                         os_free(key);
1269                         return NULL;
1270                 }
1271                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
1272                 os_memcpy(key, csk, EAP_TLS_KEY_LEN);
1273                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1274                             key, EAP_TLS_KEY_LEN);
1275         } else
1276                 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1277
1278         return key;
1279 }
1280
1281
1282 static u8 * eap_peap_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1283 {
1284         struct eap_peap_data *data = priv;
1285         u8 *id;
1286
1287         if (data->session_id == NULL || !data->phase2_success)
1288                 return NULL;
1289
1290         id = os_malloc(data->id_len);
1291         if (id == NULL)
1292                 return NULL;
1293
1294         *len = data->id_len;
1295         os_memcpy(id, data->session_id, data->id_len);
1296
1297         return id;
1298 }
1299
1300
1301 int eap_peer_peap_register(void)
1302 {
1303         struct eap_method *eap;
1304         int ret;
1305
1306         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1307                                     EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
1308         if (eap == NULL)
1309                 return -1;
1310
1311         eap->init = eap_peap_init;
1312         eap->deinit = eap_peap_deinit;
1313         eap->process = eap_peap_process;
1314         eap->isKeyAvailable = eap_peap_isKeyAvailable;
1315         eap->getKey = eap_peap_getKey;
1316         eap->get_status = eap_peap_get_status;
1317         eap->has_reauth_data = eap_peap_has_reauth_data;
1318         eap->deinit_for_reauth = eap_peap_deinit_for_reauth;
1319         eap->init_for_reauth = eap_peap_init_for_reauth;
1320         eap->getSessionId = eap_peap_get_session_id;
1321
1322         ret = eap_peer_method_register(eap);
1323         if (ret)
1324                 eap_peer_method_free(eap);
1325         return ret;
1326 }