contrib/wpa/src/eap_peer/eap_peap.c

   1 /*
   2  * EAP peer method: EAP-PEAP (draft-josefsson-pppext-eap-tls-eap-10.txt)
   3  * Copyright (c) 2004-2019, 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  */
  26 #define EAP_PEAP_VERSION 1
  27
  28
  29 static void eap_peap_deinit(struct eap_sm *sm, void *priv);
  30
  31
  32 struct eap_peap_data {
  33         struct eap_ssl_data ssl;
  34
  35         int peap_version, force_peap_version, force_new_label;
  36
  37         const struct eap_method *phase2_method;
  38         void *phase2_priv;
  39         int phase2_success;
  40         int phase2_eap_success;
  41         int phase2_eap_started;
  42
  43         struct eap_method_type phase2_type;
  44         struct eap_method_type *phase2_types;
  45         size_t num_phase2_types;
  46
  47         int peap_outer_success; /* 0 = PEAP terminated on Phase 2 inner
  48                                  * EAP-Success
  49                                  * 1 = reply with tunneled EAP-Success to inner
  50                                  * EAP-Success and expect AS to send outer
  51                                  * (unencrypted) EAP-Success after this
  52                                  * 2 = reply with PEAP/TLS ACK to inner
  53                                  * EAP-Success and expect AS to send outer
  54                                  * (unencrypted) EAP-Success after this */
  55         int resuming; /* starting a resumed session */
  56         int reauth; /* reauthentication */
  57         u8 *key_data;
  58         u8 *session_id;
  59         size_t id_len;
  60
  61         struct wpabuf *pending_phase2_req;
  62         struct wpabuf *pending_resp;
  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 void 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
 131
 132 static void * eap_peap_init(struct eap_sm *sm)
 133 {
 134         struct eap_peap_data *data;
 135         struct eap_peer_config *config = eap_get_config(sm);
 136
 137         data = os_zalloc(sizeof(*data));
 138         if (data == NULL)
 139                 return NULL;
 140         sm->peap_done = FALSE;
 141         data->peap_version = EAP_PEAP_VERSION;
 142         data->force_peap_version = -1;
 143         data->peap_outer_success = 2;
 144         data->crypto_binding = OPTIONAL_BINDING;
 145
 146         if (config && config->phase1)
 147                 eap_peap_parse_phase1(data, config->phase1);
 148
 149         if (eap_peer_select_phase2_methods(config, "auth=",
 150                                            &data->phase2_types,
 151                                            &data->num_phase2_types) < 0) {
 152                 eap_peap_deinit(sm, data);
 153                 return NULL;
 154         }
 155
 156         data->phase2_type.vendor = EAP_VENDOR_IETF;
 157         data->phase2_type.method = EAP_TYPE_NONE;
 158
 159         if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_PEAP)) {
 160                 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
 161                 eap_peap_deinit(sm, data);
 162                 return NULL;
 163         }
 164
 165         return data;
 166 }
 167
 168
 169 static void eap_peap_free_key(struct eap_peap_data *data)
 170 {
 171         if (data->key_data) {
 172                 bin_clear_free(data->key_data, EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
 173                 data->key_data = NULL;
 174         }
 175 }
 176
 177
 178 static void eap_peap_deinit(struct eap_sm *sm, void *priv)
 179 {
 180         struct eap_peap_data *data = priv;
 181         if (data == NULL)
 182                 return;
 183         if (data->phase2_priv && data->phase2_method)
 184                 data->phase2_method->deinit(sm, data->phase2_priv);
 185         os_free(data->phase2_types);
 186         eap_peer_tls_ssl_deinit(sm, &data->ssl);
 187         eap_peap_free_key(data);
 188         os_free(data->session_id);
 189         wpabuf_clear_free(data->pending_phase2_req);
 190         wpabuf_clear_free(data->pending_resp);
 191         bin_clear_free(data, sizeof(*data));
 192 }
 193
 194
 195 /**
 196  * eap_tlv_build_nak - Build EAP-TLV NAK message
 197  * @id: EAP identifier for the header
 198  * @nak_type: TLV type (EAP_TLV_*)
 199  * Returns: Buffer to the allocated EAP-TLV NAK message or %NULL on failure
 200  *
 201  * This function builds an EAP-TLV NAK message. The caller is responsible for
 202  * freeing the returned buffer.
 203  */
 204 static struct wpabuf * eap_tlv_build_nak(int id, u16 nak_type)
 205 {
 206         struct wpabuf *msg;
 207
 208         msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, 10,
 209                             EAP_CODE_RESPONSE, id);
 210         if (msg == NULL)
 211                 return NULL;
 212
 213         wpabuf_put_u8(msg, 0x80); /* Mandatory */
 214         wpabuf_put_u8(msg, EAP_TLV_NAK_TLV);
 215         wpabuf_put_be16(msg, 6); /* Length */
 216         wpabuf_put_be32(msg, 0); /* Vendor-Id */
 217         wpabuf_put_be16(msg, nak_type); /* NAK-Type */
 218
 219         return msg;
 220 }
 221
 222
 223 static int eap_peap_get_isk(struct eap_sm *sm, struct eap_peap_data *data,
 224                             u8 *isk, size_t isk_len)
 225 {
 226         u8 *key;
 227         size_t key_len;
 228
 229         os_memset(isk, 0, isk_len);
 230         if (data->phase2_method == NULL || data->phase2_priv == NULL ||
 231             data->phase2_method->isKeyAvailable == NULL ||
 232             data->phase2_method->getKey == NULL)
 233                 return 0;
 234
 235         if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
 236             (key = data->phase2_method->getKey(sm, data->phase2_priv,
 237                                                &key_len)) == NULL) {
 238                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not get key material "
 239                            "from Phase 2");
 240                 return -1;
 241         }
 242
 243         if (key_len > isk_len)
 244                 key_len = isk_len;
 245         os_memcpy(isk, key, key_len);
 246         os_free(key);
 247
 248         return 0;
 249 }
 250
 251
 252 static int eap_peap_derive_cmk(struct eap_sm *sm, struct eap_peap_data *data)
 253 {
 254         u8 *tk;
 255         u8 isk[32], imck[60];
 256         int resumed, res;
 257
 258         /*
 259          * Tunnel key (TK) is the first 60 octets of the key generated by
 260          * phase 1 of PEAP (based on TLS).
 261          */
 262         tk = data->key_data;
 263         if (tk == NULL)
 264                 return -1;
 265         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60);
 266
 267         resumed = tls_connection_resumed(sm->ssl_ctx, data->ssl.conn);
 268         wpa_printf(MSG_DEBUG,
 269                    "EAP-PEAP: CMK derivation - reauth=%d resumed=%d phase2_eap_started=%d phase2_success=%d",
 270                    data->reauth, resumed, data->phase2_eap_started,
 271                    data->phase2_success);
 272         if (data->reauth && !data->phase2_eap_started && resumed) {
 273                 /* Fast-connect: IPMK|CMK = TK */
 274                 os_memcpy(data->ipmk, tk, 40);
 275                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK from TK",
 276                                 data->ipmk, 40);
 277                 os_memcpy(data->cmk, tk + 40, 20);
 278                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK from TK",
 279                                 data->cmk, 20);
 280                 return 0;
 281         }
 282
 283         if (eap_peap_get_isk(sm, data, isk, sizeof(isk)) < 0)
 284                 return -1;
 285         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk));
 286
 287         /*
 288          * IPMK Seed = "Inner Methods Compound Keys" | ISK
 289          * TempKey = First 40 octets of TK
 290          * IPMK|CMK = PRF+(TempKey, IPMK Seed, 60)
 291          * (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space
 292          * in the end of the label just before ISK; is that just a typo?)
 293          */
 294         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40);
 295         res = peap_prfplus(data->peap_version, tk, 40,
 296                            "Inner Methods Compound Keys",
 297                            isk, sizeof(isk), imck, sizeof(imck));
 298         os_memset(isk, 0, sizeof(isk));
 299         if (res < 0)
 300                 return -1;
 301         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
 302                         imck, sizeof(imck));
 303
 304         os_memcpy(data->ipmk, imck, 40);
 305         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
 306         os_memcpy(data->cmk, imck + 40, 20);
 307         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);
 308         os_memset(imck, 0, sizeof(imck));
 309
 310         return 0;
 311 }
 312
 313
 314 static int eap_tlv_add_cryptobinding(struct eap_sm *sm,
 315                                      struct eap_peap_data *data,
 316                                      struct wpabuf *buf)
 317 {
 318         u8 *mac;
 319         u8 eap_type = EAP_TYPE_PEAP;
 320         const u8 *addr[2];
 321         size_t len[2];
 322         u16 tlv_type;
 323
 324         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
 325         addr[0] = wpabuf_put(buf, 0);
 326         len[0] = 60;
 327         addr[1] = &eap_type;
 328         len[1] = 1;
 329
 330         tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
 331         wpabuf_put_be16(buf, tlv_type);
 332         wpabuf_put_be16(buf, 56);
 333
 334         wpabuf_put_u8(buf, 0); /* Reserved */
 335         wpabuf_put_u8(buf, data->peap_version); /* Version */
 336         wpabuf_put_u8(buf, data->peap_version); /* RecvVersion */
 337         wpabuf_put_u8(buf, 1); /* SubType: 0 = Request, 1 = Response */
 338         wpabuf_put_data(buf, data->binding_nonce, 32); /* Nonce */
 339         mac = wpabuf_put(buf, 20); /* Compound_MAC */
 340         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK", data->cmk, 20);
 341         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
 342                     addr[0], len[0]);
 343         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
 344                     addr[1], len[1]);
 345         if (hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac) < 0)
 346                 return -1;
 347         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC", mac, SHA1_MAC_LEN);
 348         data->crypto_binding_used = 1;
 349
 350         return 0;
 351 }
 352
 353
 354 /**
 355  * eap_tlv_build_result - Build EAP-TLV Result message
 356  * @id: EAP identifier for the header
 357  * @status: Status (EAP_TLV_RESULT_SUCCESS or EAP_TLV_RESULT_FAILURE)
 358  * Returns: Buffer to the allocated EAP-TLV Result message or %NULL on failure
 359  *
 360  * This function builds an EAP-TLV Result message. The caller is responsible
 361  * for freeing the returned buffer.
 362  */
 363 static struct wpabuf * eap_tlv_build_result(struct eap_sm *sm,
 364                                             struct eap_peap_data *data,
 365                                             int crypto_tlv_used,
 366                                             int id, u16 status)
 367 {
 368         struct wpabuf *msg;
 369         size_t len;
 370
 371         if (data->crypto_binding == NO_BINDING)
 372                 crypto_tlv_used = 0;
 373
 374         len = 6;
 375         if (crypto_tlv_used)
 376                 len += 60; /* Cryptobinding TLV */
 377         msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len,
 378                             EAP_CODE_RESPONSE, id);
 379         if (msg == NULL)
 380                 return NULL;
 381
 382         wpabuf_put_u8(msg, 0x80); /* Mandatory */
 383         wpabuf_put_u8(msg, EAP_TLV_RESULT_TLV);
 384         wpabuf_put_be16(msg, 2); /* Length */
 385         wpabuf_put_be16(msg, status); /* Status */
 386
 387         if (crypto_tlv_used && eap_tlv_add_cryptobinding(sm, data, msg)) {
 388                 wpabuf_clear_free(msg);
 389                 return NULL;
 390         }
 391
 392         return msg;
 393 }
 394
 395
 396 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
 397                                           struct eap_peap_data *data,
 398                                           const u8 *crypto_tlv,
 399                                           size_t crypto_tlv_len)
 400 {
 401         u8 buf[61], mac[SHA1_MAC_LEN];
 402         const u8 *pos;
 403
 404         if (eap_peap_derive_cmk(sm, data) < 0) {
 405                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not derive CMK");
 406                 return -1;
 407         }
 408
 409         if (crypto_tlv_len != 4 + 56) {
 410                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
 411                            "length %d", (int) crypto_tlv_len);
 412                 return -1;
 413         }
 414
 415         pos = crypto_tlv;
 416         pos += 4; /* TLV header */
 417         if (pos[1] != data->peap_version) {
 418                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
 419                            "mismatch (was %d; expected %d)",
 420                            pos[1], data->peap_version);
 421                 return -1;
 422         }
 423
 424         if (pos[3] != 0) {
 425                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
 426                            "SubType %d", pos[3]);
 427                 return -1;
 428         }
 429         pos += 4;
 430         os_memcpy(data->binding_nonce, pos, 32);
 431         pos += 32; /* Nonce */
 432
 433         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
 434         os_memcpy(buf, crypto_tlv, 60);
 435         os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
 436         buf[60] = EAP_TYPE_PEAP;
 437         wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Compound_MAC data",
 438                     buf, sizeof(buf));
 439         hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
 440
 441         if (os_memcmp_const(mac, pos, SHA1_MAC_LEN) != 0) {
 442                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
 443                            "cryptobinding TLV");
 444                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received MAC",
 445                             pos, SHA1_MAC_LEN);
 446                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Expected MAC",
 447                             mac, SHA1_MAC_LEN);
 448                 return -1;
 449         }
 450
 451         wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
 452
 453         return 0;
 454 }
 455
 456
 457 /**
 458  * eap_tlv_process - Process a received EAP-TLV message and generate a response
 459  * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
 460  * @ret: Return values from EAP request validation and processing
 461  * @req: EAP-TLV request to be processed. The caller must have validated that
 462  * the buffer is large enough to contain full request (hdr->length bytes) and
 463  * that the EAP type is EAP_TYPE_TLV.
 464  * @resp: Buffer to return a pointer to the allocated response message. This
 465  * field should be initialized to %NULL before the call. The value will be
 466  * updated if a response message is generated. The caller is responsible for
 467  * freeing the allocated message.
 468  * @force_failure: Force negotiation to fail
 469  * Returns: 0 on success, -1 on failure
 470  */
 471 static int eap_tlv_process(struct eap_sm *sm, struct eap_peap_data *data,
 472                            struct eap_method_ret *ret,
 473                            const struct wpabuf *req, struct wpabuf **resp,
 474                            int force_failure)
 475 {
 476         size_t left, tlv_len;
 477         const u8 *pos;
 478         const u8 *result_tlv = NULL, *crypto_tlv = NULL;
 479         size_t result_tlv_len = 0, crypto_tlv_len = 0;
 480         int tlv_type, mandatory;
 481
 482         /* Parse TLVs */
 483         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, req, &left);
 484         if (pos == NULL)
 485                 return -1;
 486         wpa_hexdump(MSG_DEBUG, "EAP-TLV: Received TLVs", pos, left);
 487         while (left >= 4) {
 488                 mandatory = !!(pos[0] & 0x80);
 489                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
 490                 pos += 2;
 491                 tlv_len = WPA_GET_BE16(pos);
 492                 pos += 2;
 493                 left -= 4;
 494                 if (tlv_len > left) {
 495                         wpa_printf(MSG_DEBUG, "EAP-TLV: TLV underrun "
 496                                    "(tlv_len=%lu left=%lu)",
 497                                    (unsigned long) tlv_len,
 498                                    (unsigned long) left);
 499                         return -1;
 500                 }
 501                 switch (tlv_type) {
 502                 case EAP_TLV_RESULT_TLV:
 503                         result_tlv = pos;
 504                         result_tlv_len = tlv_len;
 505                         break;
 506                 case EAP_TLV_CRYPTO_BINDING_TLV:
 507                         crypto_tlv = pos;
 508                         crypto_tlv_len = tlv_len;
 509                         break;
 510                 default:
 511                         wpa_printf(MSG_DEBUG, "EAP-TLV: Unsupported TLV Type "
 512                                    "%d%s", tlv_type,
 513                                    mandatory ? " (mandatory)" : "");
 514                         if (mandatory) {
 515                                 /* NAK TLV and ignore all TLVs in this packet.
 516                                  */
 517                                 *resp = eap_tlv_build_nak(eap_get_id(req),
 518                                                           tlv_type);
 519                                 return *resp == NULL ? -1 : 0;
 520                         }
 521                         /* Ignore this TLV, but process other TLVs */
 522                         break;
 523                 }
 524
 525                 pos += tlv_len;
 526                 left -= tlv_len;
 527         }
 528         if (left) {
 529                 wpa_printf(MSG_DEBUG, "EAP-TLV: Last TLV too short in "
 530                            "Request (left=%lu)", (unsigned long) left);
 531                 return -1;
 532         }
 533
 534         /* Process supported TLVs */
 535         if (crypto_tlv && data->crypto_binding != NO_BINDING) {
 536                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
 537                             crypto_tlv, crypto_tlv_len);
 538                 if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
 539                                                    crypto_tlv_len + 4) < 0) {
 540                         if (result_tlv == NULL)
 541                                 return -1;
 542                         force_failure = 1;
 543                         crypto_tlv = NULL; /* do not include Cryptobinding TLV
 544                                             * in response, if the received
 545                                             * cryptobinding was invalid. */
 546                 }
 547         } else if (!crypto_tlv && data->crypto_binding == REQUIRE_BINDING) {
 548                 wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
 549                 return -1;
 550         }
 551
 552         if (result_tlv) {
 553                 int status, resp_status;
 554                 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Result TLV",
 555                             result_tlv, result_tlv_len);
 556                 if (result_tlv_len < 2) {
 557                         wpa_printf(MSG_INFO, "EAP-TLV: Too short Result TLV "
 558                                    "(len=%lu)",
 559                                    (unsigned long) result_tlv_len);
 560                         return -1;
 561                 }
 562                 status = WPA_GET_BE16(result_tlv);
 563                 if (status == EAP_TLV_RESULT_SUCCESS) {
 564                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Success "
 565                                    "- EAP-TLV/Phase2 Completed");
 566                         if (force_failure) {
 567                                 wpa_printf(MSG_INFO, "EAP-TLV: Earlier failure"
 568                                            " - force failed Phase 2");
 569                                 resp_status = EAP_TLV_RESULT_FAILURE;
 570                                 ret->decision = DECISION_FAIL;
 571                         } else {
 572                                 resp_status = EAP_TLV_RESULT_SUCCESS;
 573                                 ret->decision = DECISION_UNCOND_SUCC;
 574                         }
 575                 } else if (status == EAP_TLV_RESULT_FAILURE) {
 576                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Failure");
 577                         resp_status = EAP_TLV_RESULT_FAILURE;
 578                         ret->decision = DECISION_FAIL;
 579                 } else {
 580                         wpa_printf(MSG_INFO, "EAP-TLV: Unknown TLV Result "
 581                                    "Status %d", status);
 582                         resp_status = EAP_TLV_RESULT_FAILURE;
 583                         ret->decision = DECISION_FAIL;
 584                 }
 585                 ret->methodState = METHOD_DONE;
 586
 587                 *resp = eap_tlv_build_result(sm, data, crypto_tlv != NULL,
 588                                              eap_get_id(req), resp_status);
 589         }
 590
 591         return 0;
 592 }
 593
 594
 595 static int eap_peap_phase2_request(struct eap_sm *sm,
 596                                    struct eap_peap_data *data,
 597                                    struct eap_method_ret *ret,
 598                                    struct wpabuf *req,
 599                                    struct wpabuf **resp)
 600 {
 601         struct eap_hdr *hdr = wpabuf_mhead(req);
 602         size_t len = be_to_host16(hdr->length);
 603         u8 *pos;
 604         struct eap_method_ret iret;
 605         struct eap_peer_config *config = eap_get_config(sm);
 606
 607         if (len <= sizeof(struct eap_hdr)) {
 608                 wpa_printf(MSG_INFO, "EAP-PEAP: too short "
 609                            "Phase 2 request (len=%lu)", (unsigned long) len);
 610                 return -1;
 611         }
 612         pos = (u8 *) (hdr + 1);
 613         wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Request: type=%d", *pos);
 614         switch (*pos) {
 615         case EAP_TYPE_IDENTITY:
 616                 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
 617                 break;
 618         case EAP_TYPE_TLV:
 619                 os_memset(&iret, 0, sizeof(iret));
 620                 if (eap_tlv_process(sm, data, &iret, req, resp,
 621                                     data->phase2_eap_started &&
 622                                     !data->phase2_eap_success)) {
 623                         ret->methodState = METHOD_DONE;
 624                         ret->decision = DECISION_FAIL;
 625                         return -1;
 626                 }
 627                 if (iret.methodState == METHOD_DONE ||
 628                     iret.methodState == METHOD_MAY_CONT) {
 629                         ret->methodState = iret.methodState;
 630                         ret->decision = iret.decision;
 631                         data->phase2_success = 1;
 632                 }
 633                 break;
 634         case EAP_TYPE_EXPANDED:
 635 #ifdef EAP_TNC
 636                 if (data->soh) {
 637                         const u8 *epos;
 638                         size_t eleft;
 639
 640                         epos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21,
 641                                                 req, &eleft);
 642                         if (epos) {
 643                                 struct wpabuf *buf;
 644                                 wpa_printf(MSG_DEBUG,
 645                                            "EAP-PEAP: SoH EAP Extensions");
 646                                 buf = tncc_process_soh_request(data->soh,
 647                                                                epos, eleft);
 648                                 if (buf) {
 649                                         *resp = eap_msg_alloc(
 650                                                 EAP_VENDOR_MICROSOFT, 0x21,
 651                                                 wpabuf_len(buf),
 652                                                 EAP_CODE_RESPONSE,
 653                                                 hdr->identifier);
 654                                         if (*resp == NULL) {
 655                                                 ret->methodState = METHOD_DONE;
 656                                                 ret->decision = DECISION_FAIL;
 657                                                 wpabuf_clear_free(buf);
 658                                                 return -1;
 659                                         }
 660                                         wpabuf_put_buf(*resp, buf);
 661                                         wpabuf_clear_free(buf);
 662                                         break;
 663                                 }
 664                         }
 665                 }
 666 #endif /* EAP_TNC */
 667                 /* fall through */
 668         default:
 669                 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
 670                     data->phase2_type.method == EAP_TYPE_NONE) {
 671                         size_t i;
 672                         for (i = 0; i < data->num_phase2_types; i++) {
 673                                 if (data->phase2_types[i].vendor !=
 674                                     EAP_VENDOR_IETF ||
 675                                     data->phase2_types[i].method != *pos)
 676                                         continue;
 677
 678                                 data->phase2_type.vendor =
 679                                         data->phase2_types[i].vendor;
 680                                 data->phase2_type.method =
 681                                         data->phase2_types[i].method;
 682                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Selected "
 683                                            "Phase 2 EAP vendor %d method %d",
 684                                            data->phase2_type.vendor,
 685                                            data->phase2_type.method);
 686                                 break;
 687                         }
 688                 }
 689                 if (*pos != data->phase2_type.method ||
 690                     *pos == EAP_TYPE_NONE) {
 691                         if (eap_peer_tls_phase2_nak(data->phase2_types,
 692                                                     data->num_phase2_types,
 693                                                     hdr, resp))
 694                                 return -1;
 695                         return 0;
 696                 }
 697
 698                 if (data->phase2_priv == NULL) {
 699                         data->phase2_method = eap_peer_get_eap_method(
 700                                 data->phase2_type.vendor,
 701                                 data->phase2_type.method);
 702                         if (data->phase2_method) {
 703                                 sm->init_phase2 = 1;
 704                                 data->phase2_priv =
 705                                         data->phase2_method->init(sm);
 706                                 sm->init_phase2 = 0;
 707                         }
 708                 }
 709                 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
 710                         wpa_printf(MSG_INFO, "EAP-PEAP: failed to initialize "
 711                                    "Phase 2 EAP method %d", *pos);
 712                         ret->methodState = METHOD_DONE;
 713                         ret->decision = DECISION_FAIL;
 714                         return -1;
 715                 }
 716                 data->phase2_eap_started = 1;
 717                 os_memset(&iret, 0, sizeof(iret));
 718                 *resp = data->phase2_method->process(sm, data->phase2_priv,
 719                                                      &iret, req);
 720                 if ((iret.methodState == METHOD_DONE ||
 721                      iret.methodState == METHOD_MAY_CONT) &&
 722                     (iret.decision == DECISION_UNCOND_SUCC ||
 723                      iret.decision == DECISION_COND_SUCC)) {
 724                         data->phase2_eap_success = 1;
 725                         data->phase2_success = 1;
 726                 }
 727                 break;
 728         }
 729
 730         if (*resp == NULL &&
 731             (config->pending_req_identity || config->pending_req_password ||
 732              config->pending_req_otp || config->pending_req_new_password ||
 733              config->pending_req_sim)) {
 734                 wpabuf_clear_free(data->pending_phase2_req);
 735                 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
 736         }
 737
 738         return 0;
 739 }
 740
 741
 742 static int eap_peap_decrypt(struct eap_sm *sm, struct eap_peap_data *data,
 743                             struct eap_method_ret *ret,
 744                             const struct eap_hdr *req,
 745                             const struct wpabuf *in_data,
 746                             struct wpabuf **out_data)
 747 {
 748         struct wpabuf *in_decrypted = NULL;
 749         int res, skip_change = 0;
 750         struct eap_hdr *hdr, *rhdr;
 751         struct wpabuf *resp = NULL;
 752         size_t len;
 753
 754         wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
 755                    " Phase 2", (unsigned long) wpabuf_len(in_data));
 756
 757         if (data->pending_phase2_req) {
 758                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 request - "
 759                            "skip decryption and use old data");
 760                 /* Clear TLS reassembly state. */
 761                 eap_peer_tls_reset_input(&data->ssl);
 762                 in_decrypted = data->pending_phase2_req;
 763                 data->pending_phase2_req = NULL;
 764                 skip_change = 1;
 765                 goto continue_req;
 766         }
 767
 768         if (wpabuf_len(in_data) == 0 && sm->workaround &&
 769             data->phase2_success) {
 770                 /*
 771                  * Cisco ACS seems to be using TLS ACK to terminate
 772                  * EAP-PEAPv0/GTC. Try to reply with TLS ACK.
 773                  */
 774                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Received TLS ACK, but "
 775                            "expected data - acknowledge with TLS ACK since "
 776                            "Phase 2 has been completed");
 777                 ret->decision = DECISION_COND_SUCC;
 778                 ret->methodState = METHOD_DONE;
 779                 return 1;
 780         } else if (wpabuf_len(in_data) == 0) {
 781                 /* Received TLS ACK - requesting more fragments */
 782                 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
 783                                             data->peap_version,
 784                                             req->identifier, NULL, out_data);
 785         }
 786
 787         res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
 788         if (res)
 789                 return res;
 790
 791 continue_req:
 792         wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
 793                         in_decrypted);
 794
 795         hdr = wpabuf_mhead(in_decrypted);
 796         if (wpabuf_len(in_decrypted) == 5 && hdr->code == EAP_CODE_REQUEST &&
 797             be_to_host16(hdr->length) == 5 &&
 798             eap_get_type(in_decrypted) == EAP_TYPE_IDENTITY) {
 799                 /* At least FreeRADIUS seems to send full EAP header with
 800                  * EAP Request Identity */
 801                 skip_change = 1;
 802         }
 803         if (wpabuf_len(in_decrypted) >= 5 && hdr->code == EAP_CODE_REQUEST &&
 804             eap_get_type(in_decrypted) == EAP_TYPE_TLV) {
 805                 skip_change = 1;
 806         }
 807
 808         if (data->peap_version == 0 && !skip_change) {
 809                 struct eap_hdr *nhdr;
 810                 struct wpabuf *nmsg = wpabuf_alloc(sizeof(struct eap_hdr) +
 811                                                    wpabuf_len(in_decrypted));
 812                 if (nmsg == NULL) {
 813                         wpabuf_clear_free(in_decrypted);
 814                         return 0;
 815                 }
 816                 nhdr = wpabuf_put(nmsg, sizeof(*nhdr));
 817                 wpabuf_put_buf(nmsg, in_decrypted);
 818                 nhdr->code = req->code;
 819                 nhdr->identifier = req->identifier;
 820                 nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
 821                                             wpabuf_len(in_decrypted));
 822
 823                 wpabuf_clear_free(in_decrypted);
 824                 in_decrypted = nmsg;
 825         }
 826
 827         hdr = wpabuf_mhead(in_decrypted);
 828         if (wpabuf_len(in_decrypted) < sizeof(*hdr)) {
 829                 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
 830                            "EAP frame (len=%lu)",
 831                            (unsigned long) wpabuf_len(in_decrypted));
 832                 wpabuf_clear_free(in_decrypted);
 833                 return 0;
 834         }
 835         len = be_to_host16(hdr->length);
 836         if (len > wpabuf_len(in_decrypted)) {
 837                 wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
 838                            "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
 839                            (unsigned long) wpabuf_len(in_decrypted),
 840                            (unsigned long) len);
 841                 wpabuf_clear_free(in_decrypted);
 842                 return 0;
 843         }
 844         if (len < wpabuf_len(in_decrypted)) {
 845                 wpa_printf(MSG_INFO, "EAP-PEAP: Odd.. Phase 2 EAP header has "
 846                            "shorter length than full decrypted data "
 847                            "(%lu < %lu)",
 848                            (unsigned long) len,
 849                            (unsigned long) wpabuf_len(in_decrypted));
 850         }
 851         wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
 852                    "identifier=%d length=%lu", hdr->code, hdr->identifier,
 853                    (unsigned long) len);
 854         switch (hdr->code) {
 855         case EAP_CODE_REQUEST:
 856                 if (eap_peap_phase2_request(sm, data, ret, in_decrypted,
 857                                             &resp)) {
 858                         wpabuf_clear_free(in_decrypted);
 859                         wpa_printf(MSG_INFO, "EAP-PEAP: Phase2 Request "
 860                                    "processing failed");
 861                         return 0;
 862                 }
 863                 break;
 864         case EAP_CODE_SUCCESS:
 865                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
 866                 if (data->peap_version == 1) {
 867                         /* EAP-Success within TLS tunnel is used to indicate
 868                          * shutdown of the TLS channel. The authentication has
 869                          * been completed. */
 870                         if (data->phase2_eap_started &&
 871                             !data->phase2_eap_success) {
 872                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 "
 873                                            "Success used to indicate success, "
 874                                            "but Phase 2 EAP was not yet "
 875                                            "completed successfully");
 876                                 ret->methodState = METHOD_DONE;
 877                                 ret->decision = DECISION_FAIL;
 878                                 wpabuf_clear_free(in_decrypted);
 879                                 return 0;
 880                         }
 881                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - "
 882                                    "EAP-Success within TLS tunnel - "
 883                                    "authentication completed");
 884                         ret->decision = DECISION_UNCOND_SUCC;
 885                         ret->methodState = METHOD_DONE;
 886                         data->phase2_success = 1;
 887                         if (data->peap_outer_success == 2) {
 888                                 wpabuf_clear_free(in_decrypted);
 889                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK "
 890                                            "to finish authentication");
 891                                 return 1;
 892                         } else if (data->peap_outer_success == 1) {
 893                                 /* Reply with EAP-Success within the TLS
 894                                  * channel to complete the authentication. */
 895                                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
 896                                 if (resp) {
 897                                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
 898                                         rhdr->code = EAP_CODE_SUCCESS;
 899                                         rhdr->identifier = hdr->identifier;
 900                                         rhdr->length =
 901                                                 host_to_be16(sizeof(*rhdr));
 902                                 }
 903                         } else {
 904                                 /* No EAP-Success expected for Phase 1 (outer,
 905                                  * unencrypted auth), so force EAP state
 906                                  * machine to SUCCESS state. */
 907                                 sm->peap_done = TRUE;
 908                         }
 909                 } else {
 910                         /* FIX: ? */
 911                 }
 912                 break;
 913         case EAP_CODE_FAILURE:
 914                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
 915                 ret->decision = DECISION_FAIL;
 916                 ret->methodState = METHOD_MAY_CONT;
 917                 ret->allowNotifications = FALSE;
 918                 /* Reply with EAP-Failure within the TLS channel to complete
 919                  * failure reporting. */
 920                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
 921                 if (resp) {
 922                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
 923                         rhdr->code = EAP_CODE_FAILURE;
 924                         rhdr->identifier = hdr->identifier;
 925                         rhdr->length = host_to_be16(sizeof(*rhdr));
 926                 }
 927                 break;
 928         default:
 929                 wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
 930                            "Phase 2 EAP header", hdr->code);
 931                 break;
 932         }
 933
 934         wpabuf_clear_free(in_decrypted);
 935
 936         if (resp) {
 937                 int skip_change2 = 0;
 938                 struct wpabuf *rmsg, buf;
 939
 940                 wpa_hexdump_buf_key(MSG_DEBUG,
 941                                     "EAP-PEAP: Encrypting Phase 2 data", resp);
 942                 /* PEAP version changes */
 943                 if (wpabuf_len(resp) >= 5 &&
 944                     wpabuf_head_u8(resp)[0] == EAP_CODE_RESPONSE &&
 945                     eap_get_type(resp) == EAP_TYPE_TLV)
 946                         skip_change2 = 1;
 947                 rmsg = resp;
 948                 if (data->peap_version == 0 && !skip_change2) {
 949                         wpabuf_set(&buf, wpabuf_head_u8(resp) +
 950                                    sizeof(struct eap_hdr),
 951                                    wpabuf_len(resp) - sizeof(struct eap_hdr));
 952                         rmsg = &buf;
 953                 }
 954
 955                 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
 956                                          data->peap_version, req->identifier,
 957                                          rmsg, out_data)) {
 958                         wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt "
 959                                    "a Phase 2 frame");
 960                 }
 961                 wpabuf_clear_free(resp);
 962         }
 963
 964         return 0;
 965 }
 966
 967
 968 static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
 969                                         struct eap_method_ret *ret,
 970                                         const struct wpabuf *reqData)
 971 {
 972         const struct eap_hdr *req;
 973         size_t left;
 974         int res;
 975         u8 flags, id;
 976         struct wpabuf *resp;
 977         const u8 *pos;
 978         struct eap_peap_data *data = priv;
 979         struct wpabuf msg;
 980
 981         pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret,
 982                                         reqData, &left, &flags);
 983         if (pos == NULL)
 984                 return NULL;
 985         req = wpabuf_head(reqData);
 986         id = req->identifier;
 987
 988         if (flags & EAP_TLS_FLAGS_START) {
 989                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Start (server ver=%d, own "
 990                            "ver=%d)", flags & EAP_TLS_VERSION_MASK,
 991                         data->peap_version);
 992                 if ((flags & EAP_TLS_VERSION_MASK) < data->peap_version)
 993                         data->peap_version = flags & EAP_TLS_VERSION_MASK;
 994                 if (data->force_peap_version >= 0 &&
 995                     data->force_peap_version != data->peap_version) {
 996                         wpa_printf(MSG_WARNING, "EAP-PEAP: Failed to select "
 997                                    "forced PEAP version %d",
 998                                    data->force_peap_version);
 999                         ret->methodState = METHOD_DONE;
1000                         ret->decision = DECISION_FAIL;
1001                         ret->allowNotifications = FALSE;
1002                         return NULL;
1003                 }
1004                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Using PEAP version %d",
1005                            data->peap_version);
1006                 left = 0; /* make sure that this frame is empty, even though it
1007                            * should always be, anyway */
1008         }
1009
1010         wpabuf_set(&msg, pos, left);
1011
1012         resp = NULL;
1013         if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1014             !data->resuming) {
1015                 res = eap_peap_decrypt(sm, data, ret, req, &msg, &resp);
1016         } else {
1017                 if (sm->waiting_ext_cert_check && data->pending_resp) {
1018                         struct eap_peer_config *config = eap_get_config(sm);
1019
1020                         if (config->pending_ext_cert_check ==
1021                             EXT_CERT_CHECK_GOOD) {
1022                                 wpa_printf(MSG_DEBUG,
1023                                            "EAP-PEAP: External certificate check succeeded - continue handshake");
1024                                 resp = data->pending_resp;
1025                                 data->pending_resp = NULL;
1026                                 sm->waiting_ext_cert_check = 0;
1027                                 return resp;
1028                         }
1029
1030                         if (config->pending_ext_cert_check ==
1031                             EXT_CERT_CHECK_BAD) {
1032                                 wpa_printf(MSG_DEBUG,
1033                                            "EAP-PEAP: External certificate check failed - force authentication failure");
1034                                 ret->methodState = METHOD_DONE;
1035                                 ret->decision = DECISION_FAIL;
1036                                 sm->waiting_ext_cert_check = 0;
1037                                 return NULL;
1038                         }
1039
1040                         wpa_printf(MSG_DEBUG,
1041                                    "EAP-PEAP: Continuing to wait external server certificate validation");
1042                         return NULL;
1043                 }
1044
1045                 res = eap_peer_tls_process_helper(sm, &data->ssl,
1046                                                   EAP_TYPE_PEAP,
1047                                                   data->peap_version, id, &msg,
1048                                                   &resp);
1049
1050                 if (res < 0) {
1051                         wpa_printf(MSG_DEBUG,
1052                                    "EAP-PEAP: TLS processing failed");
1053                         ret->methodState = METHOD_DONE;
1054                         ret->decision = DECISION_FAIL;
1055                         return resp;
1056                 }
1057
1058
1059                 if (sm->waiting_ext_cert_check) {
1060                         wpa_printf(MSG_DEBUG,
1061                                    "EAP-PEAP: Waiting external server certificate validation");
1062                         wpabuf_clear_free(data->pending_resp);
1063                         data->pending_resp = resp;
1064                         return NULL;
1065                 }
1066
1067                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1068                         char *label;
1069                         wpa_printf(MSG_DEBUG,
1070                                    "EAP-PEAP: TLS done, proceed to Phase 2");
1071                         eap_peap_free_key(data);
1072                         /* draft-josefsson-ppext-eap-tls-eap-05.txt
1073                          * specifies that PEAPv1 would use "client PEAP
1074                          * encryption" as the label. However, most existing
1075                          * PEAPv1 implementations seem to be using the old
1076                          * label, "client EAP encryption", instead. Use the old
1077                          * label by default, but allow it to be configured with
1078                          * phase1 parameter peaplabel=1. */
1079                         if (data->force_new_label)
1080                                 label = "client PEAP encryption";
1081                         else
1082                                 label = "client EAP encryption";
1083                         wpa_printf(MSG_DEBUG, "EAP-PEAP: using label '%s' in "
1084                                    "key derivation", label);
1085                         data->key_data =
1086                                 eap_peer_tls_derive_key(sm, &data->ssl, label,
1087                                                         NULL, 0,
1088                                                         EAP_TLS_KEY_LEN +
1089                                                         EAP_EMSK_LEN);
1090                         if (data->key_data) {
1091                                 wpa_hexdump_key(MSG_DEBUG,
1092                                                 "EAP-PEAP: Derived key",
1093                                                 data->key_data,
1094                                                 EAP_TLS_KEY_LEN);
1095                                 wpa_hexdump_key(MSG_DEBUG,
1096                                                 "EAP-PEAP: Derived EMSK",
1097                                                 data->key_data +
1098                                                 EAP_TLS_KEY_LEN,
1099                                                 EAP_EMSK_LEN);
1100                         } else {
1101                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to "
1102                                            "derive key");
1103                         }
1104
1105                         os_free(data->session_id);
1106                         data->session_id =
1107                                 eap_peer_tls_derive_session_id(sm, &data->ssl,
1108                                                                EAP_TYPE_PEAP,
1109                                                                &data->id_len);
1110                         if (data->session_id) {
1111                                 wpa_hexdump(MSG_DEBUG,
1112                                             "EAP-PEAP: Derived Session-Id",
1113                                             data->session_id, data->id_len);
1114                         } else {
1115                                 wpa_printf(MSG_ERROR, "EAP-PEAP: Failed to "
1116                                            "derive Session-Id");
1117                         }
1118
1119                         if (sm->workaround && data->resuming) {
1120                                 /*
1121                                  * At least few RADIUS servers (Aegis v1.1.6;
1122                                  * but not v1.1.4; and Cisco ACS) seem to be
1123                                  * terminating PEAPv1 (Aegis) or PEAPv0 (Cisco
1124                                  * ACS) session resumption with outer
1125                                  * EAP-Success. This does not seem to follow
1126                                  * draft-josefsson-pppext-eap-tls-eap-05.txt
1127                                  * section 4.2, so only allow this if EAP
1128                                  * workarounds are enabled.
1129                                  */
1130                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Workaround - "
1131                                            "allow outer EAP-Success to "
1132                                            "terminate PEAP resumption");
1133                                 ret->decision = DECISION_COND_SUCC;
1134                                 data->phase2_success = 1;
1135                         }
1136
1137                         data->resuming = 0;
1138                 }
1139
1140                 if (res == 2) {
1141                         /*
1142                          * Application data included in the handshake message.
1143                          */
1144                         wpabuf_clear_free(data->pending_phase2_req);
1145                         data->pending_phase2_req = resp;
1146                         resp = NULL;
1147                         res = eap_peap_decrypt(sm, data, ret, req, &msg,
1148                                                &resp);
1149                 }
1150         }
1151
1152         if (ret->methodState == METHOD_DONE) {
1153                 ret->allowNotifications = FALSE;
1154         }
1155
1156         if (res == 1) {
1157                 wpabuf_clear_free(resp);
1158                 return eap_peer_tls_build_ack(id, EAP_TYPE_PEAP,
1159                                               data->peap_version);
1160         }
1161
1162         return resp;
1163 }
1164
1165
1166 static Boolean eap_peap_has_reauth_data(struct eap_sm *sm, void *priv)
1167 {
1168         struct eap_peap_data *data = priv;
1169         return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1170                 data->phase2_success;
1171 }
1172
1173
1174 static void eap_peap_deinit_for_reauth(struct eap_sm *sm, void *priv)
1175 {
1176         struct eap_peap_data *data = priv;
1177
1178         if (data->phase2_priv && data->phase2_method &&
1179             data->phase2_method->deinit_for_reauth)
1180                 data->phase2_method->deinit_for_reauth(sm, data->phase2_priv);
1181         wpabuf_clear_free(data->pending_phase2_req);
1182         data->pending_phase2_req = NULL;
1183         wpabuf_clear_free(data->pending_resp);
1184         data->pending_resp = NULL;
1185         data->crypto_binding_used = 0;
1186 }
1187
1188
1189 static void * eap_peap_init_for_reauth(struct eap_sm *sm, void *priv)
1190 {
1191         struct eap_peap_data *data = priv;
1192         eap_peap_free_key(data);
1193         os_free(data->session_id);
1194         data->session_id = NULL;
1195         if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1196                 os_free(data);
1197                 return NULL;
1198         }
1199         if (data->phase2_priv && data->phase2_method &&
1200             data->phase2_method->init_for_reauth)
1201                 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1202         data->phase2_success = 0;
1203         data->phase2_eap_success = 0;
1204         data->phase2_eap_started = 0;
1205         data->resuming = 1;
1206         data->reauth = 1;
1207         sm->peap_done = FALSE;
1208         return priv;
1209 }
1210
1211
1212 static int eap_peap_get_status(struct eap_sm *sm, void *priv, char *buf,
1213                                size_t buflen, int verbose)
1214 {
1215         struct eap_peap_data *data = priv;
1216         int len, ret;
1217
1218         len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1219         if (data->phase2_method) {
1220                 ret = os_snprintf(buf + len, buflen - len,
1221                                   "EAP-PEAPv%d Phase2 method=%s\n",
1222                                   data->peap_version,
1223                                   data->phase2_method->name);
1224                 if (os_snprintf_error(buflen - len, ret))
1225                         return len;
1226                 len += ret;
1227         }
1228         return len;
1229 }
1230
1231
1232 static Boolean eap_peap_isKeyAvailable(struct eap_sm *sm, void *priv)
1233 {
1234         struct eap_peap_data *data = priv;
1235         return data->key_data != NULL && data->phase2_success;
1236 }
1237
1238
1239 static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
1240 {
1241         struct eap_peap_data *data = priv;
1242         u8 *key;
1243
1244         if (data->key_data == NULL || !data->phase2_success)
1245                 return NULL;
1246
1247         key = os_malloc(EAP_TLS_KEY_LEN);
1248         if (key == NULL)
1249                 return NULL;
1250
1251         *len = EAP_TLS_KEY_LEN;
1252
1253         if (data->crypto_binding_used) {
1254                 u8 csk[128];
1255                 /*
1256                  * Note: It looks like Microsoft implementation requires null
1257                  * termination for this label while the one used for deriving
1258                  * IPMK|CMK did not use null termination.
1259                  */
1260                 if (peap_prfplus(data->peap_version, data->ipmk, 40,
1261                                  "Session Key Generating Function",
1262                                  (u8 *) "\00", 1, csk, sizeof(csk)) < 0) {
1263                         os_free(key);
1264                         return NULL;
1265                 }
1266                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
1267                 os_memcpy(key, csk, EAP_TLS_KEY_LEN);
1268                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1269                             key, EAP_TLS_KEY_LEN);
1270                 os_memset(csk, 0, sizeof(csk));
1271         } else
1272                 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1273
1274         return key;
1275 }
1276
1277
1278 static u8 * eap_peap_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1279 {
1280         struct eap_peap_data *data = priv;
1281         u8 *key;
1282
1283         if (!data->key_data || !data->phase2_success)
1284                 return NULL;
1285
1286         if (data->crypto_binding_used) {
1287                 /* [MS-PEAP] does not define EMSK derivation */
1288                 return NULL;
1289         }
1290
1291         key = os_memdup(data->key_data + EAP_TLS_KEY_LEN, EAP_EMSK_LEN);
1292         if (!key)
1293                 return NULL;
1294
1295         *len = EAP_EMSK_LEN;
1296
1297         return key;
1298 }
1299
1300
1301 static u8 * eap_peap_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1302 {
1303         struct eap_peap_data *data = priv;
1304         u8 *id;
1305
1306         if (data->session_id == NULL || !data->phase2_success)
1307                 return NULL;
1308
1309         id = os_memdup(data->session_id, data->id_len);
1310         if (id == NULL)
1311                 return NULL;
1312
1313         *len = data->id_len;
1314
1315         return id;
1316 }
1317
1318
1319 int eap_peer_peap_register(void)
1320 {
1321         struct eap_method *eap;
1322
1323         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1324                                     EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
1325         if (eap == NULL)
1326                 return -1;
1327
1328         eap->init = eap_peap_init;
1329         eap->deinit = eap_peap_deinit;
1330         eap->process = eap_peap_process;
1331         eap->isKeyAvailable = eap_peap_isKeyAvailable;
1332         eap->getKey = eap_peap_getKey;
1333         eap->get_emsk = eap_peap_get_emsk;
1334         eap->get_status = eap_peap_get_status;
1335         eap->has_reauth_data = eap_peap_has_reauth_data;
1336         eap->deinit_for_reauth = eap_peap_deinit_for_reauth;
1337         eap->init_for_reauth = eap_peap_init_for_reauth;
1338         eap->getSessionId = eap_peap_get_session_id;
1339
1340         return eap_peer_method_register(eap);
1341 }