libeap/src/eap_peer/eap_peap.c

   1 /*
   2  * EAP peer method: EAP-PEAP (draft-josefsson-pppext-eap-tls-eap-10.txt)
   3  * Copyright (c) 2004-2015, 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);
 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_free(data->pending_phase2_req);
 190         wpabuf_free(data->pending_resp);
 191         os_free(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;
 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         if (peap_prfplus(data->peap_version, tk, 40,
 296                          "Inner Methods Compound Keys",
 297                          isk, sizeof(isk), imck, sizeof(imck)) < 0)
 298                 return -1;
 299         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
 300                         imck, sizeof(imck));
 301
 302         os_memcpy(data->ipmk, imck, 40);
 303         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
 304         os_memcpy(data->cmk, imck + 40, 20);
 305         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);
 306
 307         return 0;
 308 }
 309
 310
 311 static int eap_tlv_add_cryptobinding(struct eap_sm *sm,
 312                                      struct eap_peap_data *data,
 313                                      struct wpabuf *buf)
 314 {
 315         u8 *mac;
 316         u8 eap_type = EAP_TYPE_PEAP;
 317         const u8 *addr[2];
 318         size_t len[2];
 319         u16 tlv_type;
 320
 321         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
 322         addr[0] = wpabuf_put(buf, 0);
 323         len[0] = 60;
 324         addr[1] = &eap_type;
 325         len[1] = 1;
 326
 327         tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
 328         wpabuf_put_be16(buf, tlv_type);
 329         wpabuf_put_be16(buf, 56);
 330
 331         wpabuf_put_u8(buf, 0); /* Reserved */
 332         wpabuf_put_u8(buf, data->peap_version); /* Version */
 333         wpabuf_put_u8(buf, data->peap_version); /* RecvVersion */
 334         wpabuf_put_u8(buf, 1); /* SubType: 0 = Request, 1 = Response */
 335         wpabuf_put_data(buf, data->binding_nonce, 32); /* Nonce */
 336         mac = wpabuf_put(buf, 20); /* Compound_MAC */
 337         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK", data->cmk, 20);
 338         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
 339                     addr[0], len[0]);
 340         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
 341                     addr[1], len[1]);
 342         if (hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac) < 0)
 343                 return -1;
 344         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC", mac, SHA1_MAC_LEN);
 345         data->crypto_binding_used = 1;
 346
 347         return 0;
 348 }
 349
 350
 351 /**
 352  * eap_tlv_build_result - Build EAP-TLV Result message
 353  * @id: EAP identifier for the header
 354  * @status: Status (EAP_TLV_RESULT_SUCCESS or EAP_TLV_RESULT_FAILURE)
 355  * Returns: Buffer to the allocated EAP-TLV Result message or %NULL on failure
 356  *
 357  * This function builds an EAP-TLV Result message. The caller is responsible
 358  * for freeing the returned buffer.
 359  */
 360 static struct wpabuf * eap_tlv_build_result(struct eap_sm *sm,
 361                                             struct eap_peap_data *data,
 362                                             int crypto_tlv_used,
 363                                             int id, u16 status)
 364 {
 365         struct wpabuf *msg;
 366         size_t len;
 367
 368         if (data->crypto_binding == NO_BINDING)
 369                 crypto_tlv_used = 0;
 370
 371         len = 6;
 372         if (crypto_tlv_used)
 373                 len += 60; /* Cryptobinding TLV */
 374         msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len,
 375                             EAP_CODE_RESPONSE, id);
 376         if (msg == NULL)
 377                 return NULL;
 378
 379         wpabuf_put_u8(msg, 0x80); /* Mandatory */
 380         wpabuf_put_u8(msg, EAP_TLV_RESULT_TLV);
 381         wpabuf_put_be16(msg, 2); /* Length */
 382         wpabuf_put_be16(msg, status); /* Status */
 383
 384         if (crypto_tlv_used && eap_tlv_add_cryptobinding(sm, data, msg)) {
 385                 wpabuf_free(msg);
 386                 return NULL;
 387         }
 388
 389         return msg;
 390 }
 391
 392
 393 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
 394                                           struct eap_peap_data *data,
 395                                           const u8 *crypto_tlv,
 396                                           size_t crypto_tlv_len)
 397 {
 398         u8 buf[61], mac[SHA1_MAC_LEN];
 399         const u8 *pos;
 400
 401         if (eap_peap_derive_cmk(sm, data) < 0) {
 402                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not derive CMK");
 403                 return -1;
 404         }
 405
 406         if (crypto_tlv_len != 4 + 56) {
 407                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
 408                            "length %d", (int) crypto_tlv_len);
 409                 return -1;
 410         }
 411
 412         pos = crypto_tlv;
 413         pos += 4; /* TLV header */
 414         if (pos[1] != data->peap_version) {
 415                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
 416                            "mismatch (was %d; expected %d)",
 417                            pos[1], data->peap_version);
 418                 return -1;
 419         }
 420
 421         if (pos[3] != 0) {
 422                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
 423                            "SubType %d", pos[3]);
 424                 return -1;
 425         }
 426         pos += 4;
 427         os_memcpy(data->binding_nonce, pos, 32);
 428         pos += 32; /* Nonce */
 429
 430         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
 431         os_memcpy(buf, crypto_tlv, 60);
 432         os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
 433         buf[60] = EAP_TYPE_PEAP;
 434         wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Compound_MAC data",
 435                     buf, sizeof(buf));
 436         hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
 437
 438         if (os_memcmp_const(mac, pos, SHA1_MAC_LEN) != 0) {
 439                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
 440                            "cryptobinding TLV");
 441                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received MAC",
 442                             pos, SHA1_MAC_LEN);
 443                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Expected MAC",
 444                             mac, SHA1_MAC_LEN);
 445                 return -1;
 446         }
 447
 448         wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
 449
 450         return 0;
 451 }
 452
 453
 454 /**
 455  * eap_tlv_process - Process a received EAP-TLV message and generate a response
 456  * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
 457  * @ret: Return values from EAP request validation and processing
 458  * @req: EAP-TLV request to be processed. The caller must have validated that
 459  * the buffer is large enough to contain full request (hdr->length bytes) and
 460  * that the EAP type is EAP_TYPE_TLV.
 461  * @resp: Buffer to return a pointer to the allocated response message. This
 462  * field should be initialized to %NULL before the call. The value will be
 463  * updated if a response message is generated. The caller is responsible for
 464  * freeing the allocated message.
 465  * @force_failure: Force negotiation to fail
 466  * Returns: 0 on success, -1 on failure
 467  */
 468 static int eap_tlv_process(struct eap_sm *sm, struct eap_peap_data *data,
 469                            struct eap_method_ret *ret,
 470                            const struct wpabuf *req, struct wpabuf **resp,
 471                            int force_failure)
 472 {
 473         size_t left, tlv_len;
 474         const u8 *pos;
 475         const u8 *result_tlv = NULL, *crypto_tlv = NULL;
 476         size_t result_tlv_len = 0, crypto_tlv_len = 0;
 477         int tlv_type, mandatory;
 478
 479         /* Parse TLVs */
 480         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, req, &left);
 481         if (pos == NULL)
 482                 return -1;
 483         wpa_hexdump(MSG_DEBUG, "EAP-TLV: Received TLVs", pos, left);
 484         while (left >= 4) {
 485                 mandatory = !!(pos[0] & 0x80);
 486                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
 487                 pos += 2;
 488                 tlv_len = WPA_GET_BE16(pos);
 489                 pos += 2;
 490                 left -= 4;
 491                 if (tlv_len > left) {
 492                         wpa_printf(MSG_DEBUG, "EAP-TLV: TLV underrun "
 493                                    "(tlv_len=%lu left=%lu)",
 494                                    (unsigned long) tlv_len,
 495                                    (unsigned long) left);
 496                         return -1;
 497                 }
 498                 switch (tlv_type) {
 499                 case EAP_TLV_RESULT_TLV:
 500                         result_tlv = pos;
 501                         result_tlv_len = tlv_len;
 502                         break;
 503                 case EAP_TLV_CRYPTO_BINDING_TLV:
 504                         crypto_tlv = pos;
 505                         crypto_tlv_len = tlv_len;
 506                         break;
 507                 default:
 508                         wpa_printf(MSG_DEBUG, "EAP-TLV: Unsupported TLV Type "
 509                                    "%d%s", tlv_type,
 510                                    mandatory ? " (mandatory)" : "");
 511                         if (mandatory) {
 512                                 /* NAK TLV and ignore all TLVs in this packet.
 513                                  */
 514                                 *resp = eap_tlv_build_nak(eap_get_id(req),
 515                                                           tlv_type);
 516                                 return *resp == NULL ? -1 : 0;
 517                         }
 518                         /* Ignore this TLV, but process other TLVs */
 519                         break;
 520                 }
 521
 522                 pos += tlv_len;
 523                 left -= tlv_len;
 524         }
 525         if (left) {
 526                 wpa_printf(MSG_DEBUG, "EAP-TLV: Last TLV too short in "
 527                            "Request (left=%lu)", (unsigned long) left);
 528                 return -1;
 529         }
 530
 531         /* Process supported TLVs */
 532         if (crypto_tlv && data->crypto_binding != NO_BINDING) {
 533                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
 534                             crypto_tlv, crypto_tlv_len);
 535                 if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
 536                                                    crypto_tlv_len + 4) < 0) {
 537                         if (result_tlv == NULL)
 538                                 return -1;
 539                         force_failure = 1;
 540                         crypto_tlv = NULL; /* do not include Cryptobinding TLV
 541                                             * in response, if the received
 542                                             * cryptobinding was invalid. */
 543                 }
 544         } else if (!crypto_tlv && data->crypto_binding == REQUIRE_BINDING) {
 545                 wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
 546                 return -1;
 547         }
 548
 549         if (result_tlv) {
 550                 int status, resp_status;
 551                 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Result TLV",
 552                             result_tlv, result_tlv_len);
 553                 if (result_tlv_len < 2) {
 554                         wpa_printf(MSG_INFO, "EAP-TLV: Too short Result TLV "
 555                                    "(len=%lu)",
 556                                    (unsigned long) result_tlv_len);
 557                         return -1;
 558                 }
 559                 status = WPA_GET_BE16(result_tlv);
 560                 if (status == EAP_TLV_RESULT_SUCCESS) {
 561                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Success "
 562                                    "- EAP-TLV/Phase2 Completed");
 563                         if (force_failure) {
 564                                 wpa_printf(MSG_INFO, "EAP-TLV: Earlier failure"
 565                                            " - force failed Phase 2");
 566                                 resp_status = EAP_TLV_RESULT_FAILURE;
 567                                 ret->decision = DECISION_FAIL;
 568                         } else {
 569                                 resp_status = EAP_TLV_RESULT_SUCCESS;
 570                                 ret->decision = DECISION_UNCOND_SUCC;
 571                         }
 572                 } else if (status == EAP_TLV_RESULT_FAILURE) {
 573                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Failure");
 574                         resp_status = EAP_TLV_RESULT_FAILURE;
 575                         ret->decision = DECISION_FAIL;
 576                 } else {
 577                         wpa_printf(MSG_INFO, "EAP-TLV: Unknown TLV Result "
 578                                    "Status %d", status);
 579                         resp_status = EAP_TLV_RESULT_FAILURE;
 580                         ret->decision = DECISION_FAIL;
 581                 }
 582                 ret->methodState = METHOD_DONE;
 583
 584                 *resp = eap_tlv_build_result(sm, data, crypto_tlv != NULL,
 585                                              eap_get_id(req), resp_status);
 586         }
 587
 588         return 0;
 589 }
 590
 591
 592 static int eap_peap_phase2_request(struct eap_sm *sm,
 593                                    struct eap_peap_data *data,
 594                                    struct eap_method_ret *ret,
 595                                    struct wpabuf *req,
 596                                    struct wpabuf **resp)
 597 {
 598         struct eap_hdr *hdr = wpabuf_mhead(req);
 599         size_t len = be_to_host16(hdr->length);
 600         u8 *pos;
 601         struct eap_method_ret iret;
 602         struct eap_peer_config *config = eap_get_config(sm);
 603
 604         if (len <= sizeof(struct eap_hdr)) {
 605                 wpa_printf(MSG_INFO, "EAP-PEAP: too short "
 606                            "Phase 2 request (len=%lu)", (unsigned long) len);
 607                 return -1;
 608         }
 609         pos = (u8 *) (hdr + 1);
 610         wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Request: type=%d", *pos);
 611         switch (*pos) {
 612         case EAP_TYPE_IDENTITY:
 613                 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
 614                 break;
 615         case EAP_TYPE_TLV:
 616                 os_memset(&iret, 0, sizeof(iret));
 617                 if (eap_tlv_process(sm, data, &iret, req, resp,
 618                                     data->phase2_eap_started &&
 619                                     !data->phase2_eap_success)) {
 620                         ret->methodState = METHOD_DONE;
 621                         ret->decision = DECISION_FAIL;
 622                         return -1;
 623                 }
 624                 if (iret.methodState == METHOD_DONE ||
 625                     iret.methodState == METHOD_MAY_CONT) {
 626                         ret->methodState = iret.methodState;
 627                         ret->decision = iret.decision;
 628                         data->phase2_success = 1;
 629                 }
 630                 break;
 631         case EAP_TYPE_EXPANDED:
 632 #ifdef EAP_TNC
 633                 if (data->soh) {
 634                         const u8 *epos;
 635                         size_t eleft;
 636
 637                         epos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21,
 638                                                 req, &eleft);
 639                         if (epos) {
 640                                 struct wpabuf *buf;
 641                                 wpa_printf(MSG_DEBUG,
 642                                            "EAP-PEAP: SoH EAP Extensions");
 643                                 buf = tncc_process_soh_request(data->soh,
 644                                                                epos, eleft);
 645                                 if (buf) {
 646                                         *resp = eap_msg_alloc(
 647                                                 EAP_VENDOR_MICROSOFT, 0x21,
 648                                                 wpabuf_len(buf),
 649                                                 EAP_CODE_RESPONSE,
 650                                                 hdr->identifier);
 651                                         if (*resp == NULL) {
 652                                                 ret->methodState = METHOD_DONE;
 653                                                 ret->decision = DECISION_FAIL;
 654                                                 wpabuf_free(buf);
 655                                                 return -1;
 656                                         }
 657                                         wpabuf_put_buf(*resp, buf);
 658                                         wpabuf_free(buf);
 659                                         break;
 660                                 }
 661                         }
 662                 }
 663 #endif /* EAP_TNC */
 664                 /* fall through */
 665         default:
 666                 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
 667                     data->phase2_type.method == EAP_TYPE_NONE) {
 668                         size_t i;
 669                         for (i = 0; i < data->num_phase2_types; i++) {
 670                                 if (data->phase2_types[i].vendor !=
 671                                     EAP_VENDOR_IETF ||
 672                                     data->phase2_types[i].method != *pos)
 673                                         continue;
 674
 675                                 data->phase2_type.vendor =
 676                                         data->phase2_types[i].vendor;
 677                                 data->phase2_type.method =
 678                                         data->phase2_types[i].method;
 679                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Selected "
 680                                            "Phase 2 EAP vendor %d method %d",
 681                                            data->phase2_type.vendor,
 682                                            data->phase2_type.method);
 683                                 break;
 684                         }
 685                 }
 686                 if (*pos != data->phase2_type.method ||
 687                     *pos == EAP_TYPE_NONE) {
 688                         if (eap_peer_tls_phase2_nak(data->phase2_types,
 689                                                     data->num_phase2_types,
 690                                                     hdr, resp))
 691                                 return -1;
 692                         return 0;
 693                 }
 694
 695                 if (data->phase2_priv == NULL) {
 696                         data->phase2_method = eap_peer_get_eap_method(
 697                                 data->phase2_type.vendor,
 698                                 data->phase2_type.method);
 699                         if (data->phase2_method) {
 700                                 sm->init_phase2 = 1;
 701                                 data->phase2_priv =
 702                                         data->phase2_method->init(sm);
 703                                 sm->init_phase2 = 0;
 704                         }
 705                 }
 706                 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
 707                         wpa_printf(MSG_INFO, "EAP-PEAP: failed to initialize "
 708                                    "Phase 2 EAP method %d", *pos);
 709                         ret->methodState = METHOD_DONE;
 710                         ret->decision = DECISION_FAIL;
 711                         return -1;
 712                 }
 713                 data->phase2_eap_started = 1;
 714                 os_memset(&iret, 0, sizeof(iret));
 715                 *resp = data->phase2_method->process(sm, data->phase2_priv,
 716                                                      &iret, req);
 717                 if ((iret.methodState == METHOD_DONE ||
 718                      iret.methodState == METHOD_MAY_CONT) &&
 719                     (iret.decision == DECISION_UNCOND_SUCC ||
 720                      iret.decision == DECISION_COND_SUCC)) {
 721                         data->phase2_eap_success = 1;
 722                         data->phase2_success = 1;
 723                 }
 724                 break;
 725         }
 726
 727         if (*resp == NULL &&
 728             (config->pending_req_identity || config->pending_req_password ||
 729              config->pending_req_otp || config->pending_req_new_password)) {
 730                 wpabuf_free(data->pending_phase2_req);
 731                 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
 732         }
 733
 734         return 0;
 735 }
 736
 737
 738 static int eap_peap_decrypt(struct eap_sm *sm, struct eap_peap_data *data,
 739                             struct eap_method_ret *ret,
 740                             const struct eap_hdr *req,
 741                             const struct wpabuf *in_data,
 742                             struct wpabuf **out_data)
 743 {
 744         struct wpabuf *in_decrypted = NULL;
 745         int res, skip_change = 0;
 746         struct eap_hdr *hdr, *rhdr;
 747         struct wpabuf *resp = NULL;
 748         size_t len;
 749
 750         wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
 751                    " Phase 2", (unsigned long) wpabuf_len(in_data));
 752
 753         if (data->pending_phase2_req) {
 754                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 request - "
 755                            "skip decryption and use old data");
 756                 /* Clear TLS reassembly state. */
 757                 eap_peer_tls_reset_input(&data->ssl);
 758                 in_decrypted = data->pending_phase2_req;
 759                 data->pending_phase2_req = NULL;
 760                 skip_change = 1;
 761                 goto continue_req;
 762         }
 763
 764         if (wpabuf_len(in_data) == 0 && sm->workaround &&
 765             data->phase2_success) {
 766                 /*
 767                  * Cisco ACS seems to be using TLS ACK to terminate
 768                  * EAP-PEAPv0/GTC. Try to reply with TLS ACK.
 769                  */
 770                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Received TLS ACK, but "
 771                            "expected data - acknowledge with TLS ACK since "
 772                            "Phase 2 has been completed");
 773                 ret->decision = DECISION_COND_SUCC;
 774                 ret->methodState = METHOD_DONE;
 775                 return 1;
 776         } else if (wpabuf_len(in_data) == 0) {
 777                 /* Received TLS ACK - requesting more fragments */
 778                 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
 779                                             data->peap_version,
 780                                             req->identifier, NULL, out_data);
 781         }
 782
 783         res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
 784         if (res)
 785                 return res;
 786
 787 continue_req:
 788         wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
 789                         in_decrypted);
 790
 791         hdr = wpabuf_mhead(in_decrypted);
 792         if (wpabuf_len(in_decrypted) == 5 && hdr->code == EAP_CODE_REQUEST &&
 793             be_to_host16(hdr->length) == 5 &&
 794             eap_get_type(in_decrypted) == EAP_TYPE_IDENTITY) {
 795                 /* At least FreeRADIUS seems to send full EAP header with
 796                  * EAP Request Identity */
 797                 skip_change = 1;
 798         }
 799         if (wpabuf_len(in_decrypted) >= 5 && hdr->code == EAP_CODE_REQUEST &&
 800             eap_get_type(in_decrypted) == EAP_TYPE_TLV) {
 801                 skip_change = 1;
 802         }
 803
 804         if (data->peap_version == 0 && !skip_change) {
 805                 struct eap_hdr *nhdr;
 806                 struct wpabuf *nmsg = wpabuf_alloc(sizeof(struct eap_hdr) +
 807                                                    wpabuf_len(in_decrypted));
 808                 if (nmsg == NULL) {
 809                         wpabuf_free(in_decrypted);
 810                         return 0;
 811                 }
 812                 nhdr = wpabuf_put(nmsg, sizeof(*nhdr));
 813                 wpabuf_put_buf(nmsg, in_decrypted);
 814                 nhdr->code = req->code;
 815                 nhdr->identifier = req->identifier;
 816                 nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
 817                                             wpabuf_len(in_decrypted));
 818
 819                 wpabuf_free(in_decrypted);
 820                 in_decrypted = nmsg;
 821         }
 822
 823         hdr = wpabuf_mhead(in_decrypted);
 824         if (wpabuf_len(in_decrypted) < sizeof(*hdr)) {
 825                 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
 826                            "EAP frame (len=%lu)",
 827                            (unsigned long) wpabuf_len(in_decrypted));
 828                 wpabuf_free(in_decrypted);
 829                 return 0;
 830         }
 831         len = be_to_host16(hdr->length);
 832         if (len > wpabuf_len(in_decrypted)) {
 833                 wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
 834                            "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
 835                            (unsigned long) wpabuf_len(in_decrypted),
 836                            (unsigned long) len);
 837                 wpabuf_free(in_decrypted);
 838                 return 0;
 839         }
 840         if (len < wpabuf_len(in_decrypted)) {
 841                 wpa_printf(MSG_INFO, "EAP-PEAP: Odd.. Phase 2 EAP header has "
 842                            "shorter length than full decrypted data "
 843                            "(%lu < %lu)",
 844                            (unsigned long) len,
 845                            (unsigned long) wpabuf_len(in_decrypted));
 846         }
 847         wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
 848                    "identifier=%d length=%lu", hdr->code, hdr->identifier,
 849                    (unsigned long) len);
 850         switch (hdr->code) {
 851         case EAP_CODE_REQUEST:
 852                 if (eap_peap_phase2_request(sm, data, ret, in_decrypted,
 853                                             &resp)) {
 854                         wpabuf_free(in_decrypted);
 855                         wpa_printf(MSG_INFO, "EAP-PEAP: Phase2 Request "
 856                                    "processing failed");
 857                         return 0;
 858                 }
 859                 break;
 860         case EAP_CODE_SUCCESS:
 861                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
 862                 if (data->peap_version == 1) {
 863                         /* EAP-Success within TLS tunnel is used to indicate
 864                          * shutdown of the TLS channel. The authentication has
 865                          * been completed. */
 866                         if (data->phase2_eap_started &&
 867                             !data->phase2_eap_success) {
 868                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 "
 869                                            "Success used to indicate success, "
 870                                            "but Phase 2 EAP was not yet "
 871                                            "completed successfully");
 872                                 ret->methodState = METHOD_DONE;
 873                                 ret->decision = DECISION_FAIL;
 874                                 wpabuf_free(in_decrypted);
 875                                 return 0;
 876                         }
 877                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - "
 878                                    "EAP-Success within TLS tunnel - "
 879                                    "authentication completed");
 880                         ret->decision = DECISION_UNCOND_SUCC;
 881                         ret->methodState = METHOD_DONE;
 882                         data->phase2_success = 1;
 883                         if (data->peap_outer_success == 2) {
 884                                 wpabuf_free(in_decrypted);
 885                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK "
 886                                            "to finish authentication");
 887                                 return 1;
 888                         } else if (data->peap_outer_success == 1) {
 889                                 /* Reply with EAP-Success within the TLS
 890                                  * channel to complete the authentication. */
 891                                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
 892                                 if (resp) {
 893                                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
 894                                         rhdr->code = EAP_CODE_SUCCESS;
 895                                         rhdr->identifier = hdr->identifier;
 896                                         rhdr->length =
 897                                                 host_to_be16(sizeof(*rhdr));
 898                                 }
 899                         } else {
 900                                 /* No EAP-Success expected for Phase 1 (outer,
 901                                  * unencrypted auth), so force EAP state
 902                                  * machine to SUCCESS state. */
 903                                 sm->peap_done = TRUE;
 904                         }
 905                 } else {
 906                         /* FIX: ? */
 907                 }
 908                 break;
 909         case EAP_CODE_FAILURE:
 910                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
 911                 ret->decision = DECISION_FAIL;
 912                 ret->methodState = METHOD_MAY_CONT;
 913                 ret->allowNotifications = FALSE;
 914                 /* Reply with EAP-Failure within the TLS channel to complete
 915                  * failure reporting. */
 916                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
 917                 if (resp) {
 918                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
 919                         rhdr->code = EAP_CODE_FAILURE;
 920                         rhdr->identifier = hdr->identifier;
 921                         rhdr->length = host_to_be16(sizeof(*rhdr));
 922                 }
 923                 break;
 924         default:
 925                 wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
 926                            "Phase 2 EAP header", hdr->code);
 927                 break;
 928         }
 929
 930         wpabuf_free(in_decrypted);
 931
 932         if (resp) {
 933                 int skip_change2 = 0;
 934                 struct wpabuf *rmsg, buf;
 935
 936                 wpa_hexdump_buf_key(MSG_DEBUG,
 937                                     "EAP-PEAP: Encrypting Phase 2 data", resp);
 938                 /* PEAP version changes */
 939                 if (wpabuf_len(resp) >= 5 &&
 940                     wpabuf_head_u8(resp)[0] == EAP_CODE_RESPONSE &&
 941                     eap_get_type(resp) == EAP_TYPE_TLV)
 942                         skip_change2 = 1;
 943                 rmsg = resp;
 944                 if (data->peap_version == 0 && !skip_change2) {
 945                         wpabuf_set(&buf, wpabuf_head_u8(resp) +
 946                                    sizeof(struct eap_hdr),
 947                                    wpabuf_len(resp) - sizeof(struct eap_hdr));
 948                         rmsg = &buf;
 949                 }
 950
 951                 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
 952                                          data->peap_version, req->identifier,
 953                                          rmsg, out_data)) {
 954                         wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt "
 955                                    "a Phase 2 frame");
 956                 }
 957                 wpabuf_free(resp);
 958         }
 959
 960         return 0;
 961 }
 962
 963
 964 static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
 965                                         struct eap_method_ret *ret,
 966                                         const struct wpabuf *reqData)
 967 {
 968         const struct eap_hdr *req;
 969         size_t left;
 970         int res;
 971         u8 flags, id;
 972         struct wpabuf *resp;
 973         const u8 *pos;
 974         struct eap_peap_data *data = priv;
 975         struct wpabuf msg;
 976
 977         pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret,
 978                                         reqData, &left, &flags);
 979         if (pos == NULL)
 980                 return NULL;
 981         req = wpabuf_head(reqData);
 982         id = req->identifier;
 983
 984         if (flags & EAP_TLS_FLAGS_START) {
 985                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Start (server ver=%d, own "
 986                            "ver=%d)", flags & EAP_TLS_VERSION_MASK,
 987                         data->peap_version);
 988                 if ((flags & EAP_TLS_VERSION_MASK) < data->peap_version)
 989                         data->peap_version = flags & EAP_TLS_VERSION_MASK;
 990                 if (data->force_peap_version >= 0 &&
 991                     data->force_peap_version != data->peap_version) {
 992                         wpa_printf(MSG_WARNING, "EAP-PEAP: Failed to select "
 993                                    "forced PEAP version %d",
 994                                    data->force_peap_version);
 995                         ret->methodState = METHOD_DONE;
 996                         ret->decision = DECISION_FAIL;
 997                         ret->allowNotifications = FALSE;
 998                         return NULL;
 999                 }
1000                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Using PEAP version %d",
1001                            data->peap_version);
1002                 left = 0; /* make sure that this frame is empty, even though it
1003                            * should always be, anyway */
1004         }
1005
1006         wpabuf_set(&msg, pos, left);
1007
1008         resp = NULL;
1009         if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1010             !data->resuming) {
1011                 res = eap_peap_decrypt(sm, data, ret, req, &msg, &resp);
1012         } else {
1013                 if (sm->waiting_ext_cert_check && data->pending_resp) {
1014                         struct eap_peer_config *config = eap_get_config(sm);
1015
1016                         if (config->pending_ext_cert_check ==
1017                             EXT_CERT_CHECK_GOOD) {
1018                                 wpa_printf(MSG_DEBUG,
1019                                            "EAP-PEAP: External certificate check succeeded - continue handshake");
1020                                 resp = data->pending_resp;
1021                                 data->pending_resp = NULL;
1022                                 sm->waiting_ext_cert_check = 0;
1023                                 return resp;
1024                         }
1025
1026                         if (config->pending_ext_cert_check ==
1027                             EXT_CERT_CHECK_BAD) {
1028                                 wpa_printf(MSG_DEBUG,
1029                                            "EAP-PEAP: External certificate check failed - force authentication failure");
1030                                 ret->methodState = METHOD_DONE;
1031                                 ret->decision = DECISION_FAIL;
1032                                 sm->waiting_ext_cert_check = 0;
1033                                 return NULL;
1034                         }
1035
1036                         wpa_printf(MSG_DEBUG,
1037                                    "EAP-PEAP: Continuing to wait external server certificate validation");
1038                         return NULL;
1039                 }
1040
1041                 res = eap_peer_tls_process_helper(sm, &data->ssl,
1042                                                   EAP_TYPE_PEAP,
1043                                                   data->peap_version, id, &msg,
1044                                                   &resp);
1045
1046                 if (res < 0) {
1047                         wpa_printf(MSG_DEBUG,
1048                                    "EAP-PEAP: TLS processing failed");
1049                         ret->methodState = METHOD_DONE;
1050                         ret->decision = DECISION_FAIL;
1051                         return resp;
1052                 }
1053
1054
1055                 if (sm->waiting_ext_cert_check) {
1056                         wpa_printf(MSG_DEBUG,
1057                                    "EAP-PEAP: Waiting external server certificate validation");
1058                         wpabuf_free(data->pending_resp);
1059                         data->pending_resp = resp;
1060                         return NULL;
1061                 }
1062
1063                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1064                         char *label;
1065                         wpa_printf(MSG_DEBUG,
1066                                    "EAP-PEAP: TLS done, proceed to Phase 2");
1067                         eap_peap_free_key(data);
1068                         /* draft-josefsson-ppext-eap-tls-eap-05.txt
1069                          * specifies that PEAPv1 would use "client PEAP
1070                          * encryption" as the label. However, most existing
1071                          * PEAPv1 implementations seem to be using the old
1072                          * label, "client EAP encryption", instead. Use the old
1073                          * label by default, but allow it to be configured with
1074                          * phase1 parameter peaplabel=1. */
1075                         if (data->force_new_label)
1076                                 label = "client PEAP encryption";
1077                         else
1078                                 label = "client EAP encryption";
1079                         wpa_printf(MSG_DEBUG, "EAP-PEAP: using label '%s' in "
1080                                    "key derivation", label);
1081                         data->key_data =
1082                                 eap_peer_tls_derive_key(sm, &data->ssl, label,
1083                                                         EAP_TLS_KEY_LEN);
1084                         if (data->key_data) {
1085                                 wpa_hexdump_key(MSG_DEBUG,
1086                                                 "EAP-PEAP: Derived key",
1087                                                 data->key_data,
1088                                                 EAP_TLS_KEY_LEN);
1089                         } else {
1090                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to "
1091                                            "derive key");
1092                         }
1093
1094                         os_free(data->session_id);
1095                         data->session_id =
1096                                 eap_peer_tls_derive_session_id(sm, &data->ssl,
1097                                                                EAP_TYPE_PEAP,
1098                                                                &data->id_len);
1099                         if (data->session_id) {
1100                                 wpa_hexdump(MSG_DEBUG,
1101                                             "EAP-PEAP: Derived Session-Id",
1102                                             data->session_id, data->id_len);
1103                         } else {
1104                                 wpa_printf(MSG_ERROR, "EAP-PEAP: Failed to "
1105                                            "derive Session-Id");
1106                         }
1107
1108                         if (sm->workaround && data->resuming) {
1109                                 /*
1110                                  * At least few RADIUS servers (Aegis v1.1.6;
1111                                  * but not v1.1.4; and Cisco ACS) seem to be
1112                                  * terminating PEAPv1 (Aegis) or PEAPv0 (Cisco
1113                                  * ACS) session resumption with outer
1114                                  * EAP-Success. This does not seem to follow
1115                                  * draft-josefsson-pppext-eap-tls-eap-05.txt
1116                                  * section 4.2, so only allow this if EAP
1117                                  * workarounds are enabled.
1118                                  */
1119                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Workaround - "
1120                                            "allow outer EAP-Success to "
1121                                            "terminate PEAP resumption");
1122                                 ret->decision = DECISION_COND_SUCC;
1123                                 data->phase2_success = 1;
1124                         }
1125
1126                         data->resuming = 0;
1127                 }
1128
1129                 if (res == 2) {
1130                         /*
1131                          * Application data included in the handshake message.
1132                          */
1133                         wpabuf_free(data->pending_phase2_req);
1134                         data->pending_phase2_req = resp;
1135                         resp = NULL;
1136                         res = eap_peap_decrypt(sm, data, ret, req, &msg,
1137                                                &resp);
1138                 }
1139         }
1140
1141         if (ret->methodState == METHOD_DONE) {
1142                 ret->allowNotifications = FALSE;
1143         }
1144
1145         if (res == 1) {
1146                 wpabuf_free(resp);
1147                 return eap_peer_tls_build_ack(id, EAP_TYPE_PEAP,
1148                                               data->peap_version);
1149         }
1150
1151         return resp;
1152 }
1153
1154
1155 static Boolean eap_peap_has_reauth_data(struct eap_sm *sm, void *priv)
1156 {
1157         struct eap_peap_data *data = priv;
1158         return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1159                 data->phase2_success;
1160 }
1161
1162
1163 static void eap_peap_deinit_for_reauth(struct eap_sm *sm, void *priv)
1164 {
1165         struct eap_peap_data *data = priv;
1166         wpabuf_free(data->pending_phase2_req);
1167         data->pending_phase2_req = NULL;
1168         wpabuf_free(data->pending_resp);
1169         data->pending_resp = NULL;
1170         data->crypto_binding_used = 0;
1171 }
1172
1173
1174 static void * eap_peap_init_for_reauth(struct eap_sm *sm, void *priv)
1175 {
1176         struct eap_peap_data *data = priv;
1177         eap_peap_free_key(data);
1178         os_free(data->session_id);
1179         data->session_id = NULL;
1180         if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1181                 os_free(data);
1182                 return NULL;
1183         }
1184         if (data->phase2_priv && data->phase2_method &&
1185             data->phase2_method->init_for_reauth)
1186                 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1187         data->phase2_success = 0;
1188         data->phase2_eap_success = 0;
1189         data->phase2_eap_started = 0;
1190         data->resuming = 1;
1191         data->reauth = 1;
1192         sm->peap_done = FALSE;
1193         return priv;
1194 }
1195
1196
1197 static int eap_peap_get_status(struct eap_sm *sm, void *priv, char *buf,
1198                                size_t buflen, int verbose)
1199 {
1200         struct eap_peap_data *data = priv;
1201         int len, ret;
1202
1203         len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1204         if (data->phase2_method) {
1205                 ret = os_snprintf(buf + len, buflen - len,
1206                                   "EAP-PEAPv%d Phase2 method=%s\n",
1207                                   data->peap_version,
1208                                   data->phase2_method->name);
1209                 if (os_snprintf_error(buflen - len, ret))
1210                         return len;
1211                 len += ret;
1212         }
1213         return len;
1214 }
1215
1216
1217 static Boolean eap_peap_isKeyAvailable(struct eap_sm *sm, void *priv)
1218 {
1219         struct eap_peap_data *data = priv;
1220         return data->key_data != NULL && data->phase2_success;
1221 }
1222
1223
1224 static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
1225 {
1226         struct eap_peap_data *data = priv;
1227         u8 *key;
1228
1229         if (data->key_data == NULL || !data->phase2_success)
1230                 return NULL;
1231
1232         key = os_malloc(EAP_TLS_KEY_LEN);
1233         if (key == NULL)
1234                 return NULL;
1235
1236         *len = EAP_TLS_KEY_LEN;
1237
1238         if (data->crypto_binding_used) {
1239                 u8 csk[128];
1240                 /*
1241                  * Note: It looks like Microsoft implementation requires null
1242                  * termination for this label while the one used for deriving
1243                  * IPMK|CMK did not use null termination.
1244                  */
1245                 if (peap_prfplus(data->peap_version, data->ipmk, 40,
1246                                  "Session Key Generating Function",
1247                                  (u8 *) "\00", 1, csk, sizeof(csk)) < 0) {
1248                         os_free(key);
1249                         return NULL;
1250                 }
1251                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
1252                 os_memcpy(key, csk, EAP_TLS_KEY_LEN);
1253                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1254                             key, EAP_TLS_KEY_LEN);
1255         } else
1256                 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1257
1258         return key;
1259 }
1260
1261
1262 static u8 * eap_peap_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1263 {
1264         struct eap_peap_data *data = priv;
1265         u8 *id;
1266
1267         if (data->session_id == NULL || !data->phase2_success)
1268                 return NULL;
1269
1270         id = os_malloc(data->id_len);
1271         if (id == NULL)
1272                 return NULL;
1273
1274         *len = data->id_len;
1275         os_memcpy(id, data->session_id, data->id_len);
1276
1277         return id;
1278 }
1279
1280
1281 int eap_peer_peap_register(void)
1282 {
1283         struct eap_method *eap;
1284
1285         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1286                                     EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
1287         if (eap == NULL)
1288                 return -1;
1289
1290         eap->init = eap_peap_init;
1291         eap->deinit = eap_peap_deinit;
1292         eap->process = eap_peap_process;
1293         eap->isKeyAvailable = eap_peap_isKeyAvailable;
1294         eap->getKey = eap_peap_getKey;
1295         eap->get_status = eap_peap_get_status;
1296         eap->has_reauth_data = eap_peap_has_reauth_data;
1297         eap->deinit_for_reauth = eap_peap_deinit_for_reauth;
1298         eap->init_for_reauth = eap_peap_init_for_reauth;
1299         eap->getSessionId = eap_peap_get_session_id;
1300
1301         return eap_peer_method_register(eap);
1302 }