src/eap_peer/eap_peap.c

   1 /*
   2  * EAP peer method: EAP-PEAP (draft-josefsson-pppext-eap-tls-eap-10.txt)
   3  * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "crypto/sha1.h"
  19 #include "eap_i.h"
  20 #include "eap_tls_common.h"
  21 #include "eap_config.h"
  22 #include "tls.h"
  23 #include "eap_common/eap_tlv_common.h"
  24 #include "eap_common/eap_peap_common.h"
  25 #include "tncc.h"
  26
  27
  28 /* Maximum supported PEAP version
  29  * 0 = Microsoft's PEAP version 0; draft-kamath-pppext-peapv0-00.txt
  30  * 1 = draft-josefsson-ppext-eap-tls-eap-05.txt
  31  * 2 = draft-josefsson-ppext-eap-tls-eap-10.txt
  32  */
  33 #define EAP_PEAP_VERSION 1
  34
  35
  36 static void eap_peap_deinit(struct eap_sm *sm, void *priv);
  37
  38
  39 struct eap_peap_data {
  40         struct eap_ssl_data ssl;
  41
  42         int peap_version, force_peap_version, force_new_label;
  43
  44         const struct eap_method *phase2_method;
  45         void *phase2_priv;
  46         int phase2_success;
  47         int phase2_eap_success;
  48         int phase2_eap_started;
  49
  50         struct eap_method_type phase2_type;
  51         struct eap_method_type *phase2_types;
  52         size_t num_phase2_types;
  53
  54         int peap_outer_success; /* 0 = PEAP terminated on Phase 2 inner
  55                                  * EAP-Success
  56                                  * 1 = reply with tunneled EAP-Success to inner
  57                                  * EAP-Success and expect AS to send outer
  58                                  * (unencrypted) EAP-Success after this
  59                                  * 2 = reply with PEAP/TLS ACK to inner
  60                                  * EAP-Success and expect AS to send outer
  61                                  * (unencrypted) EAP-Success after this */
  62         int resuming; /* starting a resumed session */
  63         int reauth; /* reauthentication */
  64         u8 *key_data;
  65
  66         struct wpabuf *pending_phase2_req;
  67         enum { NO_BINDING, OPTIONAL_BINDING, REQUIRE_BINDING } crypto_binding;
  68         int crypto_binding_used;
  69         u8 binding_nonce[32];
  70         u8 ipmk[40];
  71         u8 cmk[20];
  72         int soh; /* Whether IF-TNCCS-SOH (Statement of Health; Microsoft NAP)
  73                   * is enabled. */
  74 };
  75
  76
  77 static int eap_peap_parse_phase1(struct eap_peap_data *data,
  78                                  const char *phase1)
  79 {
  80         const char *pos;
  81
  82         pos = os_strstr(phase1, "peapver=");
  83         if (pos) {
  84                 data->force_peap_version = atoi(pos + 8);
  85                 data->peap_version = data->force_peap_version;
  86                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Forced PEAP version %d",
  87                            data->force_peap_version);
  88         }
  89
  90         if (os_strstr(phase1, "peaplabel=1")) {
  91                 data->force_new_label = 1;
  92                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Force new label for key "
  93                            "derivation");
  94         }
  95
  96         if (os_strstr(phase1, "peap_outer_success=0")) {
  97                 data->peap_outer_success = 0;
  98                 wpa_printf(MSG_DEBUG, "EAP-PEAP: terminate authentication on "
  99                            "tunneled EAP-Success");
 100         } else if (os_strstr(phase1, "peap_outer_success=1")) {
 101                 data->peap_outer_success = 1;
 102                 wpa_printf(MSG_DEBUG, "EAP-PEAP: send tunneled EAP-Success "
 103                            "after receiving tunneled EAP-Success");
 104         } else if (os_strstr(phase1, "peap_outer_success=2")) {
 105                 data->peap_outer_success = 2;
 106                 wpa_printf(MSG_DEBUG, "EAP-PEAP: send PEAP/TLS ACK after "
 107                            "receiving tunneled EAP-Success");
 108         }
 109
 110         if (os_strstr(phase1, "crypto_binding=0")) {
 111                 data->crypto_binding = NO_BINDING;
 112                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Do not use cryptobinding");
 113         } else if (os_strstr(phase1, "crypto_binding=1")) {
 114                 data->crypto_binding = OPTIONAL_BINDING;
 115                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Optional cryptobinding");
 116         } else if (os_strstr(phase1, "crypto_binding=2")) {
 117                 data->crypto_binding = REQUIRE_BINDING;
 118                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Require cryptobinding");
 119         }
 120
 121 #ifdef EAP_TNC
 122         if (os_strstr(phase1, "tnc=soh")) {
 123                 data->soh = 1;
 124                 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH enabled");
 125         }
 126 #endif /* EAP_TNC */
 127
 128         return 0;
 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 = NO_BINDING;
 145
 146         if (config && config->phase1 &&
 147             eap_peap_parse_phase1(data, config->phase1) < 0) {
 148                 eap_peap_deinit(sm, data);
 149                 return NULL;
 150         }
 151
 152         if (eap_peer_select_phase2_methods(config, "auth=",
 153                                            &data->phase2_types,
 154                                            &data->num_phase2_types) < 0) {
 155                 eap_peap_deinit(sm, data);
 156                 return NULL;
 157         }
 158
 159         data->phase2_type.vendor = EAP_VENDOR_IETF;
 160         data->phase2_type.method = EAP_TYPE_NONE;
 161
 162         if (eap_peer_tls_ssl_init(sm, &data->ssl, config)) {
 163                 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
 164                 eap_peap_deinit(sm, data);
 165                 return NULL;
 166         }
 167
 168         return data;
 169 }
 170
 171
 172 static void eap_peap_deinit(struct eap_sm *sm, void *priv)
 173 {
 174         struct eap_peap_data *data = priv;
 175         if (data == NULL)
 176                 return;
 177         if (data->phase2_priv && data->phase2_method)
 178                 data->phase2_method->deinit(sm, data->phase2_priv);
 179         os_free(data->phase2_types);
 180         eap_peer_tls_ssl_deinit(sm, &data->ssl);
 181         os_free(data->key_data);
 182         wpabuf_free(data->pending_phase2_req);
 183         os_free(data);
 184 }
 185
 186
 187 /**
 188  * eap_tlv_build_nak - Build EAP-TLV NAK message
 189  * @id: EAP identifier for the header
 190  * @nak_type: TLV type (EAP_TLV_*)
 191  * Returns: Buffer to the allocated EAP-TLV NAK message or %NULL on failure
 192  *
 193  * This funtion builds an EAP-TLV NAK message. The caller is responsible for
 194  * freeing the returned buffer.
 195  */
 196 static struct wpabuf * eap_tlv_build_nak(int id, u16 nak_type)
 197 {
 198         struct wpabuf *msg;
 199
 200         msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, 10,
 201                             EAP_CODE_RESPONSE, id);
 202         if (msg == NULL)
 203                 return NULL;
 204
 205         wpabuf_put_u8(msg, 0x80); /* Mandatory */
 206         wpabuf_put_u8(msg, EAP_TLV_NAK_TLV);
 207         wpabuf_put_be16(msg, 6); /* Length */
 208         wpabuf_put_be32(msg, 0); /* Vendor-Id */
 209         wpabuf_put_be16(msg, nak_type); /* NAK-Type */
 210
 211         return msg;
 212 }
 213
 214
 215 static int eap_peap_get_isk(struct eap_sm *sm, struct eap_peap_data *data,
 216                             u8 *isk, size_t isk_len)
 217 {
 218         u8 *key;
 219         size_t key_len;
 220
 221         os_memset(isk, 0, isk_len);
 222         if (data->phase2_method == NULL || data->phase2_priv == NULL ||
 223             data->phase2_method->isKeyAvailable == NULL ||
 224             data->phase2_method->getKey == NULL)
 225                 return 0;
 226
 227         if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
 228             (key = data->phase2_method->getKey(sm, data->phase2_priv,
 229                                                &key_len)) == NULL) {
 230                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not get key material "
 231                            "from Phase 2");
 232                 return -1;
 233         }
 234
 235         if (key_len == 32 &&
 236             data->phase2_method->vendor == EAP_VENDOR_IETF &&
 237             data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
 238                 /*
 239                  * Microsoft uses reverse order for MS-MPPE keys in
 240                  * EAP-PEAP when compared to EAP-FAST derivation of
 241                  * ISK. Swap the keys here to get the correct ISK for
 242                  * EAP-PEAPv0 cryptobinding.
 243                  */
 244                 u8 tmp[16];
 245                 os_memcpy(tmp, key, 16);
 246                 os_memcpy(key, key + 16, 16);
 247                 os_memcpy(key + 16, tmp, 16);
 248         }
 249
 250         if (key_len > isk_len)
 251                 key_len = isk_len;
 252         os_memcpy(isk, key, key_len);
 253         os_free(key);
 254
 255         return 0;
 256 }
 257
 258
 259 static int eap_peap_derive_cmk(struct eap_sm *sm, struct eap_peap_data *data)
 260 {
 261         u8 *tk;
 262         u8 isk[32], imck[60];
 263
 264         /*
 265          * Tunnel key (TK) is the first 60 octets of the key generated by
 266          * phase 1 of PEAP (based on TLS).
 267          */
 268         tk = data->key_data;
 269         if (tk == NULL)
 270                 return -1;
 271         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60);
 272
 273         if (data->reauth &&
 274             tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
 275                 /* Fast-connect: IPMK|CMK = TK */
 276                 os_memcpy(data->ipmk, tk, 40);
 277                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK from TK",
 278                                 data->ipmk, 40);
 279                 os_memcpy(data->cmk, tk + 40, 20);
 280                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK from TK",
 281                                 data->cmk, 20);
 282                 return 0;
 283         }
 284
 285         if (eap_peap_get_isk(sm, data, isk, sizeof(isk)) < 0)
 286                 return -1;
 287         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk));
 288
 289         /*
 290          * IPMK Seed = "Inner Methods Compound Keys" | ISK
 291          * TempKey = First 40 octets of TK
 292          * IPMK|CMK = PRF+(TempKey, IPMK Seed, 60)
 293          * (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space
 294          * in the end of the label just before ISK; is that just a typo?)
 295          */
 296         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40);
 297         peap_prfplus(data->peap_version, tk, 40, "Inner Methods Compound Keys",
 298                      isk, sizeof(isk), imck, sizeof(imck));
 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         if (data->peap_version >= 2)
 329                 tlv_type |= EAP_TLV_TYPE_MANDATORY;
 330         wpabuf_put_be16(buf, tlv_type);
 331         wpabuf_put_be16(buf, 56);
 332
 333         wpabuf_put_u8(buf, 0); /* Reserved */
 334         wpabuf_put_u8(buf, data->peap_version); /* Version */
 335         wpabuf_put_u8(buf, data->peap_version); /* RecvVersion */
 336         wpabuf_put_u8(buf, 1); /* SubType: 0 = Request, 1 = Response */
 337         wpabuf_put_data(buf, data->binding_nonce, 32); /* Nonce */
 338         mac = wpabuf_put(buf, 20); /* Compound_MAC */
 339         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK", data->cmk, 20);
 340         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
 341                     addr[0], len[0]);
 342         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
 343                     addr[1], len[1]);
 344         hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac);
 345         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC", mac, SHA1_MAC_LEN);
 346         data->crypto_binding_used = 1;
 347
 348         return 0;
 349 }
 350
 351
 352 /**
 353  * eap_tlv_build_result - Build EAP-TLV Result message
 354  * @id: EAP identifier for the header
 355  * @status: Status (EAP_TLV_RESULT_SUCCESS or EAP_TLV_RESULT_FAILURE)
 356  * Returns: Buffer to the allocated EAP-TLV Result message or %NULL on failure
 357  *
 358  * This funtion builds an EAP-TLV Result message. The caller is responsible for
 359  * freeing the returned buffer.
 360  */
 361 static struct wpabuf * eap_tlv_build_result(struct eap_sm *sm,
 362                                             struct eap_peap_data *data,
 363                                             int crypto_tlv_used,
 364                                             int id, u16 status)
 365 {
 366         struct wpabuf *msg;
 367         size_t len;
 368
 369         if (data->crypto_binding == NO_BINDING)
 370                 crypto_tlv_used = 0;
 371
 372         len = 6;
 373         if (crypto_tlv_used)
 374                 len += 60; /* Cryptobinding TLV */
 375         msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len,
 376                             EAP_CODE_RESPONSE, id);
 377         if (msg == NULL)
 378                 return NULL;
 379
 380         wpabuf_put_u8(msg, 0x80); /* Mandatory */
 381         wpabuf_put_u8(msg, EAP_TLV_RESULT_TLV);
 382         wpabuf_put_be16(msg, 2); /* Length */
 383         wpabuf_put_be16(msg, status); /* Status */
 384
 385         if (crypto_tlv_used && eap_tlv_add_cryptobinding(sm, data, msg)) {
 386                 wpabuf_free(msg);
 387                 return NULL;
 388         }
 389
 390         return msg;
 391 }
 392
 393
 394 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
 395                                           struct eap_peap_data *data,
 396                                           const u8 *crypto_tlv,
 397                                           size_t crypto_tlv_len)
 398 {
 399         u8 buf[61], mac[SHA1_MAC_LEN];
 400         const u8 *pos;
 401
 402         if (eap_peap_derive_cmk(sm, data) < 0) {
 403                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not derive CMK");
 404                 return -1;
 405         }
 406
 407         if (crypto_tlv_len != 4 + 56) {
 408                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
 409                            "length %d", (int) crypto_tlv_len);
 410                 return -1;
 411         }
 412
 413         pos = crypto_tlv;
 414         pos += 4; /* TLV header */
 415         if (pos[1] != data->peap_version) {
 416                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
 417                            "mismatch (was %d; expected %d)",
 418                            pos[1], data->peap_version);
 419                 return -1;
 420         }
 421
 422         if (pos[3] != 0) {
 423                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
 424                            "SubType %d", pos[3]);
 425                 return -1;
 426         }
 427         pos += 4;
 428         os_memcpy(data->binding_nonce, pos, 32);
 429         pos += 32; /* Nonce */
 430
 431         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
 432         os_memcpy(buf, crypto_tlv, 60);
 433         os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
 434         buf[60] = EAP_TYPE_PEAP;
 435         wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Compound_MAC data",
 436                     buf, sizeof(buf));
 437         hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
 438
 439         if (os_memcmp(mac, pos, SHA1_MAC_LEN) != 0) {
 440                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
 441                            "cryptobinding TLV");
 442                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received MAC",
 443                             pos, SHA1_MAC_LEN);
 444                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Expected MAC",
 445                             mac, SHA1_MAC_LEN);
 446                 return -1;
 447         }
 448
 449         wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
 450
 451         return 0;
 452 }
 453
 454
 455 /**
 456  * eap_tlv_process - Process a received EAP-TLV message and generate a response
 457  * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
 458  * @ret: Return values from EAP request validation and processing
 459  * @req: EAP-TLV request to be processed. The caller must have validated that
 460  * the buffer is large enough to contain full request (hdr->length bytes) and
 461  * that the EAP type is EAP_TYPE_TLV.
 462  * @resp: Buffer to return a pointer to the allocated response message. This
 463  * field should be initialized to %NULL before the call. The value will be
 464  * updated if a response message is generated. The caller is responsible for
 465  * freeing the allocated message.
 466  * @force_failure: Force negotiation to fail
 467  * Returns: 0 on success, -1 on failure
 468  */
 469 static int eap_tlv_process(struct eap_sm *sm, struct eap_peap_data *data,
 470                            struct eap_method_ret *ret,
 471                            const struct wpabuf *req, struct wpabuf **resp,
 472                            int force_failure)
 473 {
 474         size_t left, tlv_len;
 475         const u8 *pos;
 476         const u8 *result_tlv = NULL, *crypto_tlv = NULL;
 477         size_t result_tlv_len = 0, crypto_tlv_len = 0;
 478         int tlv_type, mandatory;
 479
 480         /* Parse TLVs */
 481         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, req, &left);
 482         if (pos == NULL)
 483                 return -1;
 484         wpa_hexdump(MSG_DEBUG, "EAP-TLV: Received TLVs", pos, left);
 485         while (left >= 4) {
 486                 mandatory = !!(pos[0] & 0x80);
 487                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
 488                 pos += 2;
 489                 tlv_len = WPA_GET_BE16(pos);
 490                 pos += 2;
 491                 left -= 4;
 492                 if (tlv_len > left) {
 493                         wpa_printf(MSG_DEBUG, "EAP-TLV: TLV underrun "
 494                                    "(tlv_len=%lu left=%lu)",
 495                                    (unsigned long) tlv_len,
 496                                    (unsigned long) left);
 497                         return -1;
 498                 }
 499                 switch (tlv_type) {
 500                 case EAP_TLV_RESULT_TLV:
 501                         result_tlv = pos;
 502                         result_tlv_len = tlv_len;
 503                         break;
 504                 case EAP_TLV_CRYPTO_BINDING_TLV:
 505                         crypto_tlv = pos;
 506                         crypto_tlv_len = tlv_len;
 507                         break;
 508                 default:
 509                         wpa_printf(MSG_DEBUG, "EAP-TLV: Unsupported TLV Type "
 510                                    "%d%s", tlv_type,
 511                                    mandatory ? " (mandatory)" : "");
 512                         if (mandatory) {
 513                                 /* NAK TLV and ignore all TLVs in this packet.
 514                                  */
 515                                 *resp = eap_tlv_build_nak(eap_get_id(req),
 516                                                           tlv_type);
 517                                 return *resp == NULL ? -1 : 0;
 518                         }
 519                         /* Ignore this TLV, but process other TLVs */
 520                         break;
 521                 }
 522
 523                 pos += tlv_len;
 524                 left -= tlv_len;
 525         }
 526         if (left) {
 527                 wpa_printf(MSG_DEBUG, "EAP-TLV: Last TLV too short in "
 528                            "Request (left=%lu)", (unsigned long) left);
 529                 return -1;
 530         }
 531
 532         /* Process supported TLVs */
 533         if (crypto_tlv && data->crypto_binding != NO_BINDING) {
 534                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
 535                             crypto_tlv, crypto_tlv_len);
 536                 if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
 537                                                    crypto_tlv_len + 4) < 0) {
 538                         if (result_tlv == NULL)
 539                                 return -1;
 540                         force_failure = 1;
 541                         crypto_tlv = NULL; /* do not include Cryptobinding TLV
 542                                             * in response, if the received
 543                                             * cryptobinding was invalid. */
 544                 }
 545         } else if (!crypto_tlv && data->crypto_binding == REQUIRE_BINDING) {
 546                 wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
 547                 return -1;
 548         }
 549
 550         if (result_tlv) {
 551                 int status, resp_status;
 552                 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Result TLV",
 553                             result_tlv, result_tlv_len);
 554                 if (result_tlv_len < 2) {
 555                         wpa_printf(MSG_INFO, "EAP-TLV: Too short Result TLV "
 556                                    "(len=%lu)",
 557                                    (unsigned long) result_tlv_len);
 558                         return -1;
 559                 }
 560                 status = WPA_GET_BE16(result_tlv);
 561                 if (status == EAP_TLV_RESULT_SUCCESS) {
 562                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Success "
 563                                    "- EAP-TLV/Phase2 Completed");
 564                         if (force_failure) {
 565                                 wpa_printf(MSG_INFO, "EAP-TLV: Earlier failure"
 566                                            " - force failed Phase 2");
 567                                 resp_status = EAP_TLV_RESULT_FAILURE;
 568                                 ret->decision = DECISION_FAIL;
 569                         } else {
 570                                 resp_status = EAP_TLV_RESULT_SUCCESS;
 571                                 ret->decision = DECISION_UNCOND_SUCC;
 572                         }
 573                 } else if (status == EAP_TLV_RESULT_FAILURE) {
 574                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Failure");
 575                         resp_status = EAP_TLV_RESULT_FAILURE;
 576                         ret->decision = DECISION_FAIL;
 577                 } else {
 578                         wpa_printf(MSG_INFO, "EAP-TLV: Unknown TLV Result "
 579                                    "Status %d", status);
 580                         resp_status = EAP_TLV_RESULT_FAILURE;
 581                         ret->decision = DECISION_FAIL;
 582                 }
 583                 ret->methodState = METHOD_DONE;
 584
 585                 *resp = eap_tlv_build_result(sm, data, crypto_tlv != NULL,
 586                                              eap_get_id(req), resp_status);
 587         }
 588
 589         return 0;
 590 }
 591
 592
 593 static struct wpabuf * eap_peapv2_tlv_eap_payload(struct wpabuf *buf)
 594 {
 595         struct wpabuf *e;
 596         struct eap_tlv_hdr *tlv;
 597
 598         if (buf == NULL)
 599                 return NULL;
 600
 601         /* Encapsulate EAP packet in EAP-Payload TLV */
 602         wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Add EAP-Payload TLV");
 603         e = wpabuf_alloc(sizeof(*tlv) + wpabuf_len(buf));
 604         if (e == NULL) {
 605                 wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Failed to allocate memory "
 606                            "for TLV encapsulation");
 607                 wpabuf_free(buf);
 608                 return NULL;
 609         }
 610         tlv = wpabuf_put(e, sizeof(*tlv));
 611         tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 612                                      EAP_TLV_EAP_PAYLOAD_TLV);
 613         tlv->length = host_to_be16(wpabuf_len(buf));
 614         wpabuf_put_buf(e, buf);
 615         wpabuf_free(buf);
 616         return e;
 617 }
 618
 619
 620 static int eap_peap_phase2_request(struct eap_sm *sm,
 621                                    struct eap_peap_data *data,
 622                                    struct eap_method_ret *ret,
 623                                    struct wpabuf *req,
 624                                    struct wpabuf **resp)
 625 {
 626         struct eap_hdr *hdr = wpabuf_mhead(req);
 627         size_t len = be_to_host16(hdr->length);
 628         u8 *pos;
 629         struct eap_method_ret iret;
 630         struct eap_peer_config *config = eap_get_config(sm);
 631
 632         if (len <= sizeof(struct eap_hdr)) {
 633                 wpa_printf(MSG_INFO, "EAP-PEAP: too short "
 634                            "Phase 2 request (len=%lu)", (unsigned long) len);
 635                 return -1;
 636         }
 637         pos = (u8 *) (hdr + 1);
 638         wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Request: type=%d", *pos);
 639         switch (*pos) {
 640         case EAP_TYPE_IDENTITY:
 641                 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
 642                 break;
 643         case EAP_TYPE_TLV:
 644                 os_memset(&iret, 0, sizeof(iret));
 645                 if (eap_tlv_process(sm, data, &iret, req, resp,
 646                                     data->phase2_eap_started &&
 647                                     !data->phase2_eap_success)) {
 648                         ret->methodState = METHOD_DONE;
 649                         ret->decision = DECISION_FAIL;
 650                         return -1;
 651                 }
 652                 if (iret.methodState == METHOD_DONE ||
 653                     iret.methodState == METHOD_MAY_CONT) {
 654                         ret->methodState = iret.methodState;
 655                         ret->decision = iret.decision;
 656                         data->phase2_success = 1;
 657                 }
 658                 break;
 659         case EAP_TYPE_EXPANDED:
 660 #ifdef EAP_TNC
 661                 if (data->soh) {
 662                         const u8 *epos;
 663                         size_t eleft;
 664
 665                         epos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21,
 666                                                 req, &eleft);
 667                         if (epos) {
 668                                 struct wpabuf *buf;
 669                                 wpa_printf(MSG_DEBUG,
 670                                            "EAP-PEAP: SoH EAP Extensions");
 671                                 buf = tncc_process_soh_request(epos, eleft);
 672                                 if (buf) {
 673                                         *resp = eap_msg_alloc(
 674                                                 EAP_VENDOR_MICROSOFT, 0x21,
 675                                                 wpabuf_len(buf),
 676                                                 EAP_CODE_RESPONSE,
 677                                                 hdr->identifier);
 678                                         if (*resp == NULL) {
 679                                                 ret->methodState = METHOD_DONE;
 680                                                 ret->decision = DECISION_FAIL;
 681                                                 return -1;
 682                                         }
 683                                         wpabuf_put_buf(*resp, buf);
 684                                         wpabuf_free(buf);
 685                                         break;
 686                                 }
 687                         }
 688                 }
 689 #endif /* EAP_TNC */
 690                 /* fall through */
 691         default:
 692                 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
 693                     data->phase2_type.method == EAP_TYPE_NONE) {
 694                         size_t i;
 695                         for (i = 0; i < data->num_phase2_types; i++) {
 696                                 if (data->phase2_types[i].vendor !=
 697                                     EAP_VENDOR_IETF ||
 698                                     data->phase2_types[i].method != *pos)
 699                                         continue;
 700
 701                                 data->phase2_type.vendor =
 702                                         data->phase2_types[i].vendor;
 703                                 data->phase2_type.method =
 704                                         data->phase2_types[i].method;
 705                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Selected "
 706                                            "Phase 2 EAP vendor %d method %d",
 707                                            data->phase2_type.vendor,
 708                                            data->phase2_type.method);
 709                                 break;
 710                         }
 711                 }
 712                 if (*pos != data->phase2_type.method ||
 713                     *pos == EAP_TYPE_NONE) {
 714                         if (eap_peer_tls_phase2_nak(data->phase2_types,
 715                                                     data->num_phase2_types,
 716                                                     hdr, resp))
 717                                 return -1;
 718                         return 0;
 719                 }
 720
 721                 if (data->phase2_priv == NULL) {
 722                         data->phase2_method = eap_peer_get_eap_method(
 723                                 data->phase2_type.vendor,
 724                                 data->phase2_type.method);
 725                         if (data->phase2_method) {
 726                                 sm->init_phase2 = 1;
 727                                 sm->mschapv2_full_key = 1;
 728                                 data->phase2_priv =
 729                                         data->phase2_method->init(sm);
 730                                 sm->init_phase2 = 0;
 731                                 sm->mschapv2_full_key = 0;
 732                         }
 733                 }
 734                 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
 735                         wpa_printf(MSG_INFO, "EAP-PEAP: failed to initialize "
 736                                    "Phase 2 EAP method %d", *pos);
 737                         ret->methodState = METHOD_DONE;
 738                         ret->decision = DECISION_FAIL;
 739                         return -1;
 740                 }
 741                 data->phase2_eap_started = 1;
 742                 os_memset(&iret, 0, sizeof(iret));
 743                 *resp = data->phase2_method->process(sm, data->phase2_priv,
 744                                                      &iret, req);
 745                 if ((iret.methodState == METHOD_DONE ||
 746                      iret.methodState == METHOD_MAY_CONT) &&
 747                     (iret.decision == DECISION_UNCOND_SUCC ||
 748                      iret.decision == DECISION_COND_SUCC)) {
 749                         data->phase2_eap_success = 1;
 750                         data->phase2_success = 1;
 751                 }
 752                 break;
 753         }
 754
 755         if (*resp == NULL &&
 756             (config->pending_req_identity || config->pending_req_password ||
 757              config->pending_req_otp || config->pending_req_new_password)) {
 758                 wpabuf_free(data->pending_phase2_req);
 759                 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
 760         }
 761
 762         return 0;
 763 }
 764
 765
 766 static int eap_peap_decrypt(struct eap_sm *sm, struct eap_peap_data *data,
 767                             struct eap_method_ret *ret,
 768                             const struct eap_hdr *req,
 769                             const struct wpabuf *in_data,
 770                             struct wpabuf **out_data)
 771 {
 772         struct wpabuf *in_decrypted = NULL;
 773         int res, skip_change = 0;
 774         struct eap_hdr *hdr, *rhdr;
 775         struct wpabuf *resp = NULL;
 776         size_t len;
 777
 778         wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
 779                    " Phase 2", (unsigned long) wpabuf_len(in_data));
 780
 781         if (data->pending_phase2_req) {
 782                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 request - "
 783                            "skip decryption and use old data");
 784                 /* Clear TLS reassembly state. */
 785                 eap_peer_tls_reset_input(&data->ssl);
 786                 in_decrypted = data->pending_phase2_req;
 787                 data->pending_phase2_req = NULL;
 788                 skip_change = 1;
 789                 goto continue_req;
 790         }
 791
 792         if (wpabuf_len(in_data) == 0 && sm->workaround &&
 793             data->phase2_success) {
 794                 /*
 795                  * Cisco ACS seems to be using TLS ACK to terminate
 796                  * EAP-PEAPv0/GTC. Try to reply with TLS ACK.
 797                  */
 798                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Received TLS ACK, but "
 799                            "expected data - acknowledge with TLS ACK since "
 800                            "Phase 2 has been completed");
 801                 ret->decision = DECISION_COND_SUCC;
 802                 ret->methodState = METHOD_DONE;
 803                 return 1;
 804         } else if (wpabuf_len(in_data) == 0) {
 805                 /* Received TLS ACK - requesting more fragments */
 806                 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
 807                                             data->peap_version,
 808                                             req->identifier, NULL, out_data);
 809         }
 810
 811         res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
 812         if (res)
 813                 return res;
 814
 815 continue_req:
 816         wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
 817                         in_decrypted);
 818
 819         hdr = wpabuf_mhead(in_decrypted);
 820         if (wpabuf_len(in_decrypted) == 5 && hdr->code == EAP_CODE_REQUEST &&
 821             be_to_host16(hdr->length) == 5 &&
 822             eap_get_type(in_decrypted) == EAP_TYPE_IDENTITY) {
 823                 /* At least FreeRADIUS seems to send full EAP header with
 824                  * EAP Request Identity */
 825                 skip_change = 1;
 826         }
 827         if (wpabuf_len(in_decrypted) >= 5 && hdr->code == EAP_CODE_REQUEST &&
 828             eap_get_type(in_decrypted) == EAP_TYPE_TLV) {
 829                 skip_change = 1;
 830         }
 831
 832         if (data->peap_version == 0 && !skip_change) {
 833                 struct eap_hdr *nhdr;
 834                 struct wpabuf *nmsg = wpabuf_alloc(sizeof(struct eap_hdr) +
 835                                                    wpabuf_len(in_decrypted));
 836                 if (nmsg == NULL) {
 837                         wpabuf_free(in_decrypted);
 838                         return 0;
 839                 }
 840                 nhdr = wpabuf_put(nmsg, sizeof(*nhdr));
 841                 wpabuf_put_buf(nmsg, in_decrypted);
 842                 nhdr->code = req->code;
 843                 nhdr->identifier = req->identifier;
 844                 nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
 845                                             wpabuf_len(in_decrypted));
 846
 847                 wpabuf_free(in_decrypted);
 848                 in_decrypted = nmsg;
 849         }
 850
 851         if (data->peap_version >= 2) {
 852                 struct eap_tlv_hdr *tlv;
 853                 struct wpabuf *nmsg;
 854
 855                 if (wpabuf_len(in_decrypted) < sizeof(*tlv) + sizeof(*hdr)) {
 856                         wpa_printf(MSG_INFO, "EAP-PEAPv2: Too short Phase 2 "
 857                                    "EAP TLV");
 858                         wpabuf_free(in_decrypted);
 859                         return 0;
 860                 }
 861                 tlv = wpabuf_mhead(in_decrypted);
 862                 if ((be_to_host16(tlv->tlv_type) & 0x3fff) !=
 863                     EAP_TLV_EAP_PAYLOAD_TLV) {
 864                         wpa_printf(MSG_INFO, "EAP-PEAPv2: Not an EAP TLV");
 865                         wpabuf_free(in_decrypted);
 866                         return 0;
 867                 }
 868                 if (sizeof(*tlv) + be_to_host16(tlv->length) >
 869                     wpabuf_len(in_decrypted)) {
 870                         wpa_printf(MSG_INFO, "EAP-PEAPv2: Invalid EAP TLV "
 871                                    "length");
 872                         wpabuf_free(in_decrypted);
 873                         return 0;
 874                 }
 875                 hdr = (struct eap_hdr *) (tlv + 1);
 876                 if (be_to_host16(hdr->length) > be_to_host16(tlv->length)) {
 877                         wpa_printf(MSG_INFO, "EAP-PEAPv2: No room for full "
 878                                    "EAP packet in EAP TLV");
 879                         wpabuf_free(in_decrypted);
 880                         return 0;
 881                 }
 882
 883                 nmsg = wpabuf_alloc(be_to_host16(hdr->length));
 884                 if (nmsg == NULL) {
 885                         wpabuf_free(in_decrypted);
 886                         return 0;
 887                 }
 888
 889                 wpabuf_put_data(nmsg, hdr, be_to_host16(hdr->length));
 890                 wpabuf_free(in_decrypted);
 891                 in_decrypted = nmsg;
 892         }
 893
 894         hdr = wpabuf_mhead(in_decrypted);
 895         if (wpabuf_len(in_decrypted) < sizeof(*hdr)) {
 896                 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
 897                            "EAP frame (len=%lu)",
 898                            (unsigned long) wpabuf_len(in_decrypted));
 899                 wpabuf_free(in_decrypted);
 900                 return 0;
 901         }
 902         len = be_to_host16(hdr->length);
 903         if (len > wpabuf_len(in_decrypted)) {
 904                 wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
 905                            "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
 906                            (unsigned long) wpabuf_len(in_decrypted),
 907                            (unsigned long) len);
 908                 wpabuf_free(in_decrypted);
 909                 return 0;
 910         }
 911         if (len < wpabuf_len(in_decrypted)) {
 912                 wpa_printf(MSG_INFO, "EAP-PEAP: Odd.. Phase 2 EAP header has "
 913                            "shorter length than full decrypted data "
 914                            "(%lu < %lu)",
 915                            (unsigned long) len,
 916                            (unsigned long) wpabuf_len(in_decrypted));
 917         }
 918         wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
 919                    "identifier=%d length=%lu", hdr->code, hdr->identifier,
 920                    (unsigned long) len);
 921         switch (hdr->code) {
 922         case EAP_CODE_REQUEST:
 923                 if (eap_peap_phase2_request(sm, data, ret, in_decrypted,
 924                                             &resp)) {
 925                         wpabuf_free(in_decrypted);
 926                         wpa_printf(MSG_INFO, "EAP-PEAP: Phase2 Request "
 927                                    "processing failed");
 928                         return 0;
 929                 }
 930                 break;
 931         case EAP_CODE_SUCCESS:
 932                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
 933                 if (data->peap_version == 1) {
 934                         /* EAP-Success within TLS tunnel is used to indicate
 935                          * shutdown of the TLS channel. The authentication has
 936                          * been completed. */
 937                         if (data->phase2_eap_started &&
 938                             !data->phase2_eap_success) {
 939                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 "
 940                                            "Success used to indicate success, "
 941                                            "but Phase 2 EAP was not yet "
 942                                            "completed successfully");
 943                                 ret->methodState = METHOD_DONE;
 944                                 ret->decision = DECISION_FAIL;
 945                                 wpabuf_free(in_decrypted);
 946                                 return 0;
 947                         }
 948                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - "
 949                                    "EAP-Success within TLS tunnel - "
 950                                    "authentication completed");
 951                         ret->decision = DECISION_UNCOND_SUCC;
 952                         ret->methodState = METHOD_DONE;
 953                         data->phase2_success = 1;
 954                         if (data->peap_outer_success == 2) {
 955                                 wpabuf_free(in_decrypted);
 956                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK "
 957                                            "to finish authentication");
 958                                 return 1;
 959                         } else if (data->peap_outer_success == 1) {
 960                                 /* Reply with EAP-Success within the TLS
 961                                  * channel to complete the authentication. */
 962                                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
 963                                 if (resp) {
 964                                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
 965                                         rhdr->code = EAP_CODE_SUCCESS;
 966                                         rhdr->identifier = hdr->identifier;
 967                                         rhdr->length =
 968                                                 host_to_be16(sizeof(*rhdr));
 969                                 }
 970                         } else {
 971                                 /* No EAP-Success expected for Phase 1 (outer,
 972                                  * unencrypted auth), so force EAP state
 973                                  * machine to SUCCESS state. */
 974                                 sm->peap_done = TRUE;
 975                         }
 976                 } else {
 977                         /* FIX: ? */
 978                 }
 979                 break;
 980         case EAP_CODE_FAILURE:
 981                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
 982                 ret->decision = DECISION_FAIL;
 983                 ret->methodState = METHOD_MAY_CONT;
 984                 ret->allowNotifications = FALSE;
 985                 /* Reply with EAP-Failure within the TLS channel to complete
 986                  * failure reporting. */
 987                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
 988                 if (resp) {
 989                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
 990                         rhdr->code = EAP_CODE_FAILURE;
 991                         rhdr->identifier = hdr->identifier;
 992                         rhdr->length = host_to_be16(sizeof(*rhdr));
 993                 }
 994                 break;
 995         default:
 996                 wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
 997                            "Phase 2 EAP header", hdr->code);
 998                 break;
 999         }
1000
1001         wpabuf_free(in_decrypted);
1002
1003         if (resp) {
1004                 int skip_change2 = 0;
1005                 struct wpabuf *rmsg, buf;
1006
1007                 wpa_hexdump_buf_key(MSG_DEBUG,
1008                                     "EAP-PEAP: Encrypting Phase 2 data", resp);
1009                 /* PEAP version changes */
1010                 if (data->peap_version >= 2) {
1011                         resp = eap_peapv2_tlv_eap_payload(resp);
1012                         if (resp == NULL)
1013                                 return -1;
1014                 }
1015                 if (wpabuf_len(resp) >= 5 &&
1016                     wpabuf_head_u8(resp)[0] == EAP_CODE_RESPONSE &&
1017                     eap_get_type(resp) == EAP_TYPE_TLV)
1018                         skip_change2 = 1;
1019                 rmsg = resp;
1020                 if (data->peap_version == 0 && !skip_change2) {
1021                         wpabuf_set(&buf, wpabuf_head_u8(resp) +
1022                                    sizeof(struct eap_hdr),
1023                                    wpabuf_len(resp) - sizeof(struct eap_hdr));
1024                         rmsg = &buf;
1025                 }
1026
1027                 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
1028                                          data->peap_version, req->identifier,
1029                                          rmsg, out_data)) {
1030                         wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt "
1031                                    "a Phase 2 frame");
1032                 }
1033                 wpabuf_free(resp);
1034         }
1035
1036         return 0;
1037 }
1038
1039
1040 static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
1041                                         struct eap_method_ret *ret,
1042                                         const struct wpabuf *reqData)
1043 {
1044         const struct eap_hdr *req;
1045         size_t left;
1046         int res;
1047         u8 flags, id;
1048         struct wpabuf *resp;
1049         const u8 *pos;
1050         struct eap_peap_data *data = priv;
1051
1052         pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret,
1053                                         reqData, &left, &flags);
1054         if (pos == NULL)
1055                 return NULL;
1056         req = wpabuf_head(reqData);
1057         id = req->identifier;
1058
1059         if (flags & EAP_TLS_FLAGS_START) {
1060                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Start (server ver=%d, own "
1061                            "ver=%d)", flags & EAP_PEAP_VERSION_MASK,
1062                         data->peap_version);
1063                 if ((flags & EAP_PEAP_VERSION_MASK) < data->peap_version)
1064                         data->peap_version = flags & EAP_PEAP_VERSION_MASK;
1065                 if (data->force_peap_version >= 0 &&
1066                     data->force_peap_version != data->peap_version) {
1067                         wpa_printf(MSG_WARNING, "EAP-PEAP: Failed to select "
1068                                    "forced PEAP version %d",
1069                                    data->force_peap_version);
1070                         ret->methodState = METHOD_DONE;
1071                         ret->decision = DECISION_FAIL;
1072                         ret->allowNotifications = FALSE;
1073                         return NULL;
1074                 }
1075                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Using PEAP version %d",
1076                            data->peap_version);
1077                 left = 0; /* make sure that this frame is empty, even though it
1078                            * should always be, anyway */
1079         }
1080
1081         resp = NULL;
1082         if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1083             !data->resuming) {
1084                 struct wpabuf msg;
1085                 wpabuf_set(&msg, pos, left);
1086                 res = eap_peap_decrypt(sm, data, ret, req, &msg, &resp);
1087         } else {
1088                 res = eap_peer_tls_process_helper(sm, &data->ssl,
1089                                                   EAP_TYPE_PEAP,
1090                                                   data->peap_version, id, pos,
1091                                                   left, &resp);
1092
1093                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1094                         char *label;
1095                         wpa_printf(MSG_DEBUG,
1096                                    "EAP-PEAP: TLS done, proceed to Phase 2");
1097                         os_free(data->key_data);
1098                         /* draft-josefsson-ppext-eap-tls-eap-05.txt
1099                          * specifies that PEAPv1 would use "client PEAP
1100                          * encryption" as the label. However, most existing
1101                          * PEAPv1 implementations seem to be using the old
1102                          * label, "client EAP encryption", instead. Use the old
1103                          * label by default, but allow it to be configured with
1104                          * phase1 parameter peaplabel=1. */
1105                         if (data->peap_version > 1 || data->force_new_label)
1106                                 label = "client PEAP encryption";
1107                         else
1108                                 label = "client EAP encryption";
1109                         wpa_printf(MSG_DEBUG, "EAP-PEAP: using label '%s' in "
1110                                    "key derivation", label);
1111                         data->key_data =
1112                                 eap_peer_tls_derive_key(sm, &data->ssl, label,
1113                                                         EAP_TLS_KEY_LEN);
1114                         if (data->key_data) {
1115                                 wpa_hexdump_key(MSG_DEBUG,
1116                                                 "EAP-PEAP: Derived key",
1117                                                 data->key_data,
1118                                                 EAP_TLS_KEY_LEN);
1119                         } else {
1120                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to "
1121                                            "derive key");
1122                         }
1123
1124                         if (sm->workaround && data->resuming) {
1125                                 /*
1126                                  * At least few RADIUS servers (Aegis v1.1.6;
1127                                  * but not v1.1.4; and Cisco ACS) seem to be
1128                                  * terminating PEAPv1 (Aegis) or PEAPv0 (Cisco
1129                                  * ACS) session resumption with outer
1130                                  * EAP-Success. This does not seem to follow
1131                                  * draft-josefsson-pppext-eap-tls-eap-05.txt
1132                                  * section 4.2, so only allow this if EAP
1133                                  * workarounds are enabled.
1134                                  */
1135                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Workaround - "
1136                                            "allow outer EAP-Success to "
1137                                            "terminate PEAP resumption");
1138                                 ret->decision = DECISION_COND_SUCC;
1139                                 data->phase2_success = 1;
1140                         }
1141
1142                         data->resuming = 0;
1143                 }
1144
1145                 if (res == 2) {
1146                         struct wpabuf msg;
1147                         /*
1148                          * Application data included in the handshake message.
1149                          */
1150                         wpabuf_free(data->pending_phase2_req);
1151                         data->pending_phase2_req = resp;
1152                         resp = NULL;
1153                         wpabuf_set(&msg, pos, left);
1154                         res = eap_peap_decrypt(sm, data, ret, req, &msg,
1155                                                &resp);
1156                 }
1157         }
1158
1159         if (ret->methodState == METHOD_DONE) {
1160                 ret->allowNotifications = FALSE;
1161         }
1162
1163         if (res == 1) {
1164                 wpabuf_free(resp);
1165                 return eap_peer_tls_build_ack(id, EAP_TYPE_PEAP,
1166                                               data->peap_version);
1167         }
1168
1169         return resp;
1170 }
1171
1172
1173 static Boolean eap_peap_has_reauth_data(struct eap_sm *sm, void *priv)
1174 {
1175         struct eap_peap_data *data = priv;
1176         return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1177                 data->phase2_success;
1178 }
1179
1180
1181 static void eap_peap_deinit_for_reauth(struct eap_sm *sm, void *priv)
1182 {
1183         struct eap_peap_data *data = priv;
1184         wpabuf_free(data->pending_phase2_req);
1185         data->pending_phase2_req = NULL;
1186         data->crypto_binding_used = 0;
1187 }
1188
1189
1190 static void * eap_peap_init_for_reauth(struct eap_sm *sm, void *priv)
1191 {
1192         struct eap_peap_data *data = priv;
1193         os_free(data->key_data);
1194         data->key_data = 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 (ret < 0 || (size_t) ret >= buflen - len)
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                 peap_prfplus(data->peap_version, data->ipmk, 40,
1261                              "Session Key Generating Function",
1262                              (u8 *) "\00", 1, csk, sizeof(csk));
1263                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
1264                 os_memcpy(key, csk, EAP_TLS_KEY_LEN);
1265                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1266                             key, EAP_TLS_KEY_LEN);
1267         } else
1268                 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1269
1270         return key;
1271 }
1272
1273
1274 int eap_peer_peap_register(void)
1275 {
1276         struct eap_method *eap;
1277         int ret;
1278
1279         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1280                                     EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
1281         if (eap == NULL)
1282                 return -1;
1283
1284         eap->init = eap_peap_init;
1285         eap->deinit = eap_peap_deinit;
1286         eap->process = eap_peap_process;
1287         eap->isKeyAvailable = eap_peap_isKeyAvailable;
1288         eap->getKey = eap_peap_getKey;
1289         eap->get_status = eap_peap_get_status;
1290         eap->has_reauth_data = eap_peap_has_reauth_data;
1291         eap->deinit_for_reauth = eap_peap_deinit_for_reauth;
1292         eap->init_for_reauth = eap_peap_init_for_reauth;
1293
1294         ret = eap_peer_method_register(eap);
1295         if (ret)
1296                 eap_peer_method_free(eap);
1297         return ret;
1298 }