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
  25
  26 /* Maximum supported PEAP version
  27  * 0 = Microsoft's PEAP version 0; draft-kamath-pppext-peapv0-00.txt
  28  * 1 = draft-josefsson-ppext-eap-tls-eap-05.txt
  29  * 2 = draft-josefsson-ppext-eap-tls-eap-10.txt
  30  */
  31 #define EAP_PEAP_VERSION 1
  32
  33
  34 static void eap_peap_deinit(struct eap_sm *sm, void *priv);
  35
  36
  37 struct eap_peap_data {
  38         struct eap_ssl_data ssl;
  39
  40         int peap_version, force_peap_version, force_new_label;
  41
  42         const struct eap_method *phase2_method;
  43         void *phase2_priv;
  44         int phase2_success;
  45         int phase2_eap_success;
  46         int phase2_eap_started;
  47
  48         struct eap_method_type phase2_type;
  49         struct eap_method_type *phase2_types;
  50         size_t num_phase2_types;
  51
  52         int peap_outer_success; /* 0 = PEAP terminated on Phase 2 inner
  53                                  * EAP-Success
  54                                  * 1 = reply with tunneled EAP-Success to inner
  55                                  * EAP-Success and expect AS to send outer
  56                                  * (unencrypted) EAP-Success after this
  57                                  * 2 = reply with PEAP/TLS ACK to inner
  58                                  * EAP-Success and expect AS to send outer
  59                                  * (unencrypted) EAP-Success after this */
  60         int resuming; /* starting a resumed session */
  61         u8 *key_data;
  62
  63         struct wpabuf *pending_phase2_req;
  64         enum { NO_BINDING, OPTIONAL_BINDING, REQUIRE_BINDING } crypto_binding;
  65         int crypto_binding_used;
  66         u8 ipmk[40];
  67         u8 cmk[20];
  68 };
  69
  70
  71 static int eap_peap_parse_phase1(struct eap_peap_data *data,
  72                                  const char *phase1)
  73 {
  74         const char *pos;
  75
  76         pos = os_strstr(phase1, "peapver=");
  77         if (pos) {
  78                 data->force_peap_version = atoi(pos + 8);
  79                 data->peap_version = data->force_peap_version;
  80                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Forced PEAP version %d",
  81                            data->force_peap_version);
  82         }
  83
  84         if (os_strstr(phase1, "peaplabel=1")) {
  85                 data->force_new_label = 1;
  86                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Force new label for key "
  87                            "derivation");
  88         }
  89
  90         if (os_strstr(phase1, "peap_outer_success=0")) {
  91                 data->peap_outer_success = 0;
  92                 wpa_printf(MSG_DEBUG, "EAP-PEAP: terminate authentication on "
  93                            "tunneled EAP-Success");
  94         } else if (os_strstr(phase1, "peap_outer_success=1")) {
  95                 data->peap_outer_success = 1;
  96                 wpa_printf(MSG_DEBUG, "EAP-PEAP: send tunneled EAP-Success "
  97                            "after receiving tunneled EAP-Success");
  98         } else if (os_strstr(phase1, "peap_outer_success=2")) {
  99                 data->peap_outer_success = 2;
 100                 wpa_printf(MSG_DEBUG, "EAP-PEAP: send PEAP/TLS ACK after "
 101                            "receiving tunneled EAP-Success");
 102         }
 103
 104         if (os_strstr(phase1, "crypto_binding=0")) {
 105                 data->crypto_binding = NO_BINDING;
 106                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Do not use cryptobinding");
 107         } else if (os_strstr(phase1, "crypto_binding=1")) {
 108                 data->crypto_binding = OPTIONAL_BINDING;
 109                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Optional cryptobinding");
 110         } else if (os_strstr(phase1, "crypto_binding=2")) {
 111                 data->crypto_binding = REQUIRE_BINDING;
 112                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Require cryptobinding");
 113         }
 114
 115         return 0;
 116 }
 117
 118
 119 static void * eap_peap_init(struct eap_sm *sm)
 120 {
 121         struct eap_peap_data *data;
 122         struct eap_peer_config *config = eap_get_config(sm);
 123
 124         data = os_zalloc(sizeof(*data));
 125         if (data == NULL)
 126                 return NULL;
 127         sm->peap_done = FALSE;
 128         data->peap_version = EAP_PEAP_VERSION;
 129         data->force_peap_version = -1;
 130         data->peap_outer_success = 2;
 131         data->crypto_binding = OPTIONAL_BINDING;
 132
 133         if (config && config->phase1 &&
 134             eap_peap_parse_phase1(data, config->phase1) < 0) {
 135                 eap_peap_deinit(sm, data);
 136                 return NULL;
 137         }
 138
 139         if (eap_peer_select_phase2_methods(config, "auth=",
 140                                            &data->phase2_types,
 141                                            &data->num_phase2_types) < 0) {
 142                 eap_peap_deinit(sm, data);
 143                 return NULL;
 144         }
 145
 146         data->phase2_type.vendor = EAP_VENDOR_IETF;
 147         data->phase2_type.method = EAP_TYPE_NONE;
 148
 149         if (eap_peer_tls_ssl_init(sm, &data->ssl, config)) {
 150                 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
 151                 eap_peap_deinit(sm, data);
 152                 return NULL;
 153         }
 154
 155         return data;
 156 }
 157
 158
 159 static void eap_peap_deinit(struct eap_sm *sm, void *priv)
 160 {
 161         struct eap_peap_data *data = priv;
 162         if (data == NULL)
 163                 return;
 164         if (data->phase2_priv && data->phase2_method)
 165                 data->phase2_method->deinit(sm, data->phase2_priv);
 166         os_free(data->phase2_types);
 167         eap_peer_tls_ssl_deinit(sm, &data->ssl);
 168         os_free(data->key_data);
 169         wpabuf_free(data->pending_phase2_req);
 170         os_free(data);
 171 }
 172
 173
 174 /**
 175  * eap_tlv_build_nak - Build EAP-TLV NAK message
 176  * @id: EAP identifier for the header
 177  * @nak_type: TLV type (EAP_TLV_*)
 178  * Returns: Buffer to the allocated EAP-TLV NAK message or %NULL on failure
 179  *
 180  * This funtion builds an EAP-TLV NAK message. The caller is responsible for
 181  * freeing the returned buffer.
 182  */
 183 static struct wpabuf * eap_tlv_build_nak(int id, u16 nak_type)
 184 {
 185         struct wpabuf *msg;
 186
 187         msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, 10,
 188                             EAP_CODE_RESPONSE, id);
 189         if (msg == NULL)
 190                 return NULL;
 191
 192         wpabuf_put_u8(msg, 0x80); /* Mandatory */
 193         wpabuf_put_u8(msg, EAP_TLV_NAK_TLV);
 194         wpabuf_put_be16(msg, 6); /* Length */
 195         wpabuf_put_be32(msg, 0); /* Vendor-Id */
 196         wpabuf_put_be16(msg, nak_type); /* NAK-Type */
 197
 198         return msg;
 199 }
 200
 201
 202 static int eap_peap_get_isk(struct eap_sm *sm, struct eap_peap_data *data,
 203                             u8 *isk, size_t isk_len)
 204 {
 205         u8 *key;
 206         size_t key_len;
 207
 208         os_memset(isk, 0, isk_len);
 209         if (data->phase2_method == NULL || data->phase2_priv == NULL ||
 210             data->phase2_method->isKeyAvailable == NULL ||
 211             data->phase2_method->getKey == NULL)
 212                 return 0;
 213
 214         if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
 215             (key = data->phase2_method->getKey(sm, data->phase2_priv,
 216                                                &key_len)) == NULL) {
 217                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not get key material "
 218                            "from Phase 2");
 219                 return -1;
 220         }
 221
 222         if (key_len == 32 &&
 223             data->phase2_method->vendor == EAP_VENDOR_IETF &&
 224             data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
 225                 /*
 226                  * Microsoft uses reverse order for MS-MPPE keys in
 227                  * EAP-PEAP when compared to EAP-FAST derivation of
 228                  * ISK. Swap the keys here to get the correct ISK for
 229                  * EAP-PEAPv0 cryptobinding.
 230                  */
 231                 u8 tmp[16];
 232                 os_memcpy(tmp, key, 16);
 233                 os_memcpy(key, key + 16, 16);
 234                 os_memcpy(key + 16, tmp, 16);
 235         }
 236
 237         if (key_len > isk_len)
 238                 key_len = isk_len;
 239         os_memcpy(isk, key, key_len);
 240         os_free(key);
 241
 242         return 0;
 243 }
 244
 245
 246 void peap_prfplus(int version, const u8 *key, size_t key_len,
 247                   const char *label, const u8 *seed, size_t seed_len,
 248                   u8 *buf, size_t buf_len)
 249 {
 250         unsigned char counter = 0;
 251         size_t pos, plen;
 252         u8 hash[SHA1_MAC_LEN];
 253         size_t label_len = os_strlen(label);
 254         u8 extra[2];
 255         const unsigned char *addr[5];
 256         size_t len[5];
 257
 258         addr[0] = hash;
 259         len[0] = 0;
 260         addr[1] = (unsigned char *) label;
 261         len[1] = label_len;
 262         addr[2] = seed;
 263         len[2] = seed_len;
 264
 265         if (version == 0) {
 266                 /*
 267                  * PRF+(K, S, LEN) = T1 | T2 | ... | Tn
 268                  * T1 = HMAC-SHA1(K, S | 0x01 | 0x00 | 0x00)
 269                  * T2 = HMAC-SHA1(K, T1 | S | 0x02 | 0x00 | 0x00)
 270                  * ...
 271                  * Tn = HMAC-SHA1(K, Tn-1 | S | n | 0x00 | 0x00)
 272                  */
 273
 274                 extra[0] = 0;
 275                 extra[1] = 0;
 276
 277                 addr[3] = &counter;
 278                 len[3] = 1;
 279                 addr[4] = extra;
 280                 len[4] = 2;
 281         } else {
 282                 /*
 283                  * PRF (K,S,LEN) = T1 | T2 | T3 | T4 | ... where:
 284                  * T1 = HMAC-SHA1(K, S | LEN | 0x01)
 285                  * T2 = HMAC-SHA1 (K, T1 | S | LEN | 0x02)
 286                  * T3 = HMAC-SHA1 (K, T2 | S | LEN | 0x03)
 287                  * T4 = HMAC-SHA1 (K, T3 | S | LEN | 0x04)
 288                  *   ...
 289                  */
 290
 291                 extra[0] = buf_len & 0xff;
 292
 293                 addr[3] = extra;
 294                 len[3] = 1;
 295                 addr[4] = &counter;
 296                 len[4] = 1;
 297         }
 298
 299         pos = 0;
 300         while (pos < buf_len) {
 301                 counter++;
 302                 plen = buf_len - pos;
 303                 hmac_sha1_vector(key, key_len, 5, addr, len, hash);
 304                 if (plen >= SHA1_MAC_LEN) {
 305                         os_memcpy(&buf[pos], hash, SHA1_MAC_LEN);
 306                         pos += SHA1_MAC_LEN;
 307                 } else {
 308                         os_memcpy(&buf[pos], hash, plen);
 309                         break;
 310                 }
 311                 len[0] = SHA1_MAC_LEN;
 312         }
 313 }
 314
 315
 316 static int eap_peap_derive_cmk(struct eap_sm *sm, struct eap_peap_data *data)
 317 {
 318         u8 *tk;
 319         u8 isk[32], imck[60];
 320
 321         /*
 322          * Tunnel key (TK) is the first 60 octets of the key generated by
 323          * phase 1 of PEAP (based on TLS).
 324          */
 325         tk = data->key_data;
 326         if (tk == NULL)
 327                 return -1;
 328         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60);
 329
 330         if (eap_peap_get_isk(sm, data, isk, sizeof(isk)) < 0)
 331                 return -1;
 332         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk));
 333
 334         /*
 335          * IPMK Seed = "Inner Methods Compound Keys" | ISK
 336          * TempKey = First 40 octets of TK
 337          * IPMK|CMK = PRF+(TempKey, IPMK Seed, 60)
 338          * (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space
 339          * in the end of the label just before ISK; is that just a typo?)
 340          */
 341         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40);
 342         peap_prfplus(data->peap_version, tk, 40, "Inner Methods Compound Keys",
 343                      isk, sizeof(isk), imck, sizeof(imck));
 344         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
 345                         imck, sizeof(imck));
 346
 347         /* TODO: fast-connect: IPMK|CMK = TK */
 348         os_memcpy(data->ipmk, imck, 40);
 349         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
 350         os_memcpy(data->cmk, imck + 40, 20);
 351         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);
 352
 353         return 0;
 354 }
 355
 356
 357 static int eap_tlv_add_cryptobinding(struct eap_sm *sm,
 358                                      struct eap_peap_data *data,
 359                                      struct wpabuf *buf)
 360 {
 361         u8 *mac;
 362         u8 eap_type = EAP_TYPE_PEAP;
 363         const u8 *addr[2];
 364         size_t len[2];
 365         u16 tlv_type;
 366         u8 binding_nonce[32];
 367
 368         /* FIX: should binding_nonce be copied from request? */
 369         if (os_get_random(binding_nonce, 32))
 370                 return -1;
 371
 372         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
 373         addr[0] = wpabuf_put(buf, 0);
 374         len[0] = 60;
 375         addr[1] = &eap_type;
 376         len[1] = 1;
 377
 378         tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
 379         if (data->peap_version >= 2)
 380                 tlv_type |= EAP_TLV_TYPE_MANDATORY;
 381         wpabuf_put_be16(buf, tlv_type);
 382         wpabuf_put_be16(buf, 56);
 383
 384         wpabuf_put_u8(buf, 0); /* Reserved */
 385         wpabuf_put_u8(buf, data->peap_version); /* Version */
 386         wpabuf_put_u8(buf, data->peap_version); /* RecvVersion */
 387         wpabuf_put_u8(buf, 1); /* SubType: 0 = Request, 1 = Response */
 388         wpabuf_put_data(buf, binding_nonce, 32); /* Nonce */
 389         mac = wpabuf_put(buf, 20); /* Compound_MAC */
 390         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK", data->cmk, 20);
 391         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
 392                     addr[0], len[0]);
 393         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
 394                     addr[1], len[1]);
 395         hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac);
 396         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC", mac, SHA1_MAC_LEN);
 397         data->crypto_binding_used = 1;
 398
 399         return 0;
 400 }
 401
 402
 403 /**
 404  * eap_tlv_build_result - Build EAP-TLV Result message
 405  * @id: EAP identifier for the header
 406  * @status: Status (EAP_TLV_RESULT_SUCCESS or EAP_TLV_RESULT_FAILURE)
 407  * Returns: Buffer to the allocated EAP-TLV Result message or %NULL on failure
 408  *
 409  * This funtion builds an EAP-TLV Result message. The caller is responsible for
 410  * freeing the returned buffer.
 411  */
 412 static struct wpabuf * eap_tlv_build_result(struct eap_sm *sm,
 413                                             struct eap_peap_data *data,
 414                                             int crypto_tlv_used,
 415                                             int id, u16 status)
 416 {
 417         struct wpabuf *msg;
 418         size_t len;
 419
 420         if (data->crypto_binding == NO_BINDING)
 421                 crypto_tlv_used = 0;
 422
 423         len = 6;
 424         if (crypto_tlv_used)
 425                 len += 60; /* Cryptobinding TLV */
 426         msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len,
 427                             EAP_CODE_RESPONSE, id);
 428         if (msg == NULL)
 429                 return NULL;
 430
 431         wpabuf_put_u8(msg, 0x80); /* Mandatory */
 432         wpabuf_put_u8(msg, EAP_TLV_RESULT_TLV);
 433         wpabuf_put_be16(msg, 2); /* Length */
 434         wpabuf_put_be16(msg, status); /* Status */
 435
 436         if (crypto_tlv_used && eap_tlv_add_cryptobinding(sm, data, msg)) {
 437                 wpabuf_free(msg);
 438                 return NULL;
 439         }
 440
 441         return msg;
 442 }
 443
 444
 445 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
 446                                           struct eap_peap_data *data,
 447                                           const u8 *crypto_tlv,
 448                                           size_t crypto_tlv_len)
 449 {
 450         u8 buf[61], mac[SHA1_MAC_LEN];
 451         const u8 *pos;
 452
 453         if (eap_peap_derive_cmk(sm, data) < 0) {
 454                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not derive CMK");
 455                 return -1;
 456         }
 457
 458         if (crypto_tlv_len != 4 + 56) {
 459                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
 460                            "length %d", (int) crypto_tlv_len);
 461                 return -1;
 462         }
 463
 464         pos = crypto_tlv;
 465         pos += 4; /* TLV header */
 466         if (pos[1] != data->peap_version) {
 467                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
 468                            "mismatch (was %d; expected %d)",
 469                            pos[1], data->peap_version);
 470                 return -1;
 471         }
 472
 473         if (pos[3] != 0) {
 474                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
 475                            "SubType %d", pos[3]);
 476                 return -1;
 477         }
 478         pos += 4;
 479         pos += 32; /* Nonce */
 480
 481         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
 482         os_memcpy(buf, crypto_tlv, 60);
 483         os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
 484         buf[60] = EAP_TYPE_PEAP;
 485         hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
 486
 487         if (os_memcmp(mac, pos, SHA1_MAC_LEN) != 0) {
 488                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
 489                            "cryptobinding TLV");
 490                 return -1;
 491         }
 492
 493         wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
 494
 495         return 0;
 496 }
 497
 498
 499 /**
 500  * eap_tlv_process - Process a received EAP-TLV message and generate a response
 501  * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
 502  * @ret: Return values from EAP request validation and processing
 503  * @req: EAP-TLV request to be processed. The caller must have validated that
 504  * the buffer is large enough to contain full request (hdr->length bytes) and
 505  * that the EAP type is EAP_TYPE_TLV.
 506  * @resp: Buffer to return a pointer to the allocated response message. This
 507  * field should be initialized to %NULL before the call. The value will be
 508  * updated if a response message is generated. The caller is responsible for
 509  * freeing the allocated message.
 510  * @force_failure: Force negotiation to fail
 511  * Returns: 0 on success, -1 on failure
 512  */
 513 static int eap_tlv_process(struct eap_sm *sm, struct eap_peap_data *data,
 514                            struct eap_method_ret *ret,
 515                            const struct wpabuf *req, struct wpabuf **resp,
 516                            int force_failure)
 517 {
 518         size_t left, tlv_len;
 519         const u8 *pos;
 520         const u8 *result_tlv = NULL, *crypto_tlv = NULL;
 521         size_t result_tlv_len = 0, crypto_tlv_len = 0;
 522         int tlv_type, mandatory;
 523
 524         /* Parse TLVs */
 525         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, req, &left);
 526         if (pos == NULL)
 527                 return -1;
 528         wpa_hexdump(MSG_DEBUG, "EAP-TLV: Received TLVs", pos, left);
 529         while (left >= 4) {
 530                 mandatory = !!(pos[0] & 0x80);
 531                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
 532                 pos += 2;
 533                 tlv_len = WPA_GET_BE16(pos);
 534                 pos += 2;
 535                 left -= 4;
 536                 if (tlv_len > left) {
 537                         wpa_printf(MSG_DEBUG, "EAP-TLV: TLV underrun "
 538                                    "(tlv_len=%lu left=%lu)",
 539                                    (unsigned long) tlv_len,
 540                                    (unsigned long) left);
 541                         return -1;
 542                 }
 543                 switch (tlv_type) {
 544                 case EAP_TLV_RESULT_TLV:
 545                         result_tlv = pos;
 546                         result_tlv_len = tlv_len;
 547                         break;
 548                 case EAP_TLV_CRYPTO_BINDING_TLV:
 549                         crypto_tlv = pos;
 550                         crypto_tlv_len = tlv_len;
 551                         break;
 552                 default:
 553                         wpa_printf(MSG_DEBUG, "EAP-TLV: Unsupported TLV Type "
 554                                    "%d%s", tlv_type,
 555                                    mandatory ? " (mandatory)" : "");
 556                         if (mandatory) {
 557                                 /* NAK TLV and ignore all TLVs in this packet.
 558                                  */
 559                                 *resp = eap_tlv_build_nak(eap_get_id(req),
 560                                                           tlv_type);
 561                                 return *resp == NULL ? -1 : 0;
 562                         }
 563                         /* Ignore this TLV, but process other TLVs */
 564                         break;
 565                 }
 566
 567                 pos += tlv_len;
 568                 left -= tlv_len;
 569         }
 570         if (left) {
 571                 wpa_printf(MSG_DEBUG, "EAP-TLV: Last TLV too short in "
 572                            "Request (left=%lu)", (unsigned long) left);
 573                 return -1;
 574         }
 575
 576         /* Process supported TLVs */
 577         if (crypto_tlv && data->crypto_binding != NO_BINDING) {
 578                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
 579                             crypto_tlv, crypto_tlv_len);
 580                 if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
 581                                                    crypto_tlv_len + 4) < 0) {
 582                         if (result_tlv == NULL)
 583                                 return -1;
 584                         force_failure = 1;
 585                 }
 586         } else if (!crypto_tlv && data->crypto_binding == REQUIRE_BINDING) {
 587                 wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
 588                 return -1;
 589         }
 590
 591         if (result_tlv) {
 592                 int status, resp_status;
 593                 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Result TLV",
 594                             result_tlv, result_tlv_len);
 595                 if (result_tlv_len < 2) {
 596                         wpa_printf(MSG_INFO, "EAP-TLV: Too short Result TLV "
 597                                    "(len=%lu)",
 598                                    (unsigned long) result_tlv_len);
 599                         return -1;
 600                 }
 601                 status = WPA_GET_BE16(result_tlv);
 602                 if (status == EAP_TLV_RESULT_SUCCESS) {
 603                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Success "
 604                                    "- EAP-TLV/Phase2 Completed");
 605                         if (force_failure) {
 606                                 wpa_printf(MSG_INFO, "EAP-TLV: Earlier failure"
 607                                            " - force failed Phase 2");
 608                                 resp_status = EAP_TLV_RESULT_FAILURE;
 609                                 ret->decision = DECISION_FAIL;
 610                         } else {
 611                                 resp_status = EAP_TLV_RESULT_SUCCESS;
 612                                 ret->decision = DECISION_UNCOND_SUCC;
 613                         }
 614                 } else if (status == EAP_TLV_RESULT_FAILURE) {
 615                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Failure");
 616                         resp_status = EAP_TLV_RESULT_FAILURE;
 617                         ret->decision = DECISION_FAIL;
 618                 } else {
 619                         wpa_printf(MSG_INFO, "EAP-TLV: Unknown TLV Result "
 620                                    "Status %d", status);
 621                         resp_status = EAP_TLV_RESULT_FAILURE;
 622                         ret->decision = DECISION_FAIL;
 623                 }
 624                 ret->methodState = METHOD_DONE;
 625
 626                 *resp = eap_tlv_build_result(sm, data, crypto_tlv != NULL,
 627                                              eap_get_id(req), resp_status);
 628         }
 629
 630         return 0;
 631 }
 632
 633
 634 static struct wpabuf * eap_peapv2_tlv_eap_payload(struct wpabuf *buf)
 635 {
 636         struct wpabuf *e;
 637         struct eap_tlv_hdr *tlv;
 638
 639         if (buf == NULL)
 640                 return NULL;
 641
 642         /* Encapsulate EAP packet in EAP-Payload TLV */
 643         wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Add EAP-Payload TLV");
 644         e = wpabuf_alloc(sizeof(*tlv) + wpabuf_len(buf));
 645         if (e == NULL) {
 646                 wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Failed to allocate memory "
 647                            "for TLV encapsulation");
 648                 wpabuf_free(buf);
 649                 return NULL;
 650         }
 651         tlv = wpabuf_put(e, sizeof(*tlv));
 652         tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 653                                      EAP_TLV_EAP_PAYLOAD_TLV);
 654         tlv->length = host_to_be16(wpabuf_len(buf));
 655         wpabuf_put_buf(e, buf);
 656         wpabuf_free(buf);
 657         return e;
 658 }
 659
 660
 661 static int eap_peap_phase2_request(struct eap_sm *sm,
 662                                    struct eap_peap_data *data,
 663                                    struct eap_method_ret *ret,
 664                                    struct wpabuf *req,
 665                                    struct wpabuf **resp)
 666 {
 667         struct eap_hdr *hdr = wpabuf_mhead(req);
 668         size_t len = be_to_host16(hdr->length);
 669         u8 *pos;
 670         struct eap_method_ret iret;
 671         struct eap_peer_config *config = eap_get_config(sm);
 672
 673         if (len <= sizeof(struct eap_hdr)) {
 674                 wpa_printf(MSG_INFO, "EAP-PEAP: too short "
 675                            "Phase 2 request (len=%lu)", (unsigned long) len);
 676                 return -1;
 677         }
 678         pos = (u8 *) (hdr + 1);
 679         wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Request: type=%d", *pos);
 680         switch (*pos) {
 681         case EAP_TYPE_IDENTITY:
 682                 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
 683                 break;
 684         case EAP_TYPE_TLV:
 685                 os_memset(&iret, 0, sizeof(iret));
 686                 if (eap_tlv_process(sm, data, &iret, req, resp,
 687                                     data->phase2_eap_started &&
 688                                     !data->phase2_eap_success)) {
 689                         ret->methodState = METHOD_DONE;
 690                         ret->decision = DECISION_FAIL;
 691                         return -1;
 692                 }
 693                 if (iret.methodState == METHOD_DONE ||
 694                     iret.methodState == METHOD_MAY_CONT) {
 695                         ret->methodState = iret.methodState;
 696                         ret->decision = iret.decision;
 697                         data->phase2_success = 1;
 698                 }
 699                 break;
 700         default:
 701                 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
 702                     data->phase2_type.method == EAP_TYPE_NONE) {
 703                         size_t i;
 704                         for (i = 0; i < data->num_phase2_types; i++) {
 705                                 if (data->phase2_types[i].vendor !=
 706                                     EAP_VENDOR_IETF ||
 707                                     data->phase2_types[i].method != *pos)
 708                                         continue;
 709
 710                                 data->phase2_type.vendor =
 711                                         data->phase2_types[i].vendor;
 712                                 data->phase2_type.method =
 713                                         data->phase2_types[i].method;
 714                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Selected "
 715                                            "Phase 2 EAP vendor %d method %d",
 716                                            data->phase2_type.vendor,
 717                                            data->phase2_type.method);
 718                                 break;
 719                         }
 720                 }
 721                 if (*pos != data->phase2_type.method ||
 722                     *pos == EAP_TYPE_NONE) {
 723                         if (eap_peer_tls_phase2_nak(data->phase2_types,
 724                                                     data->num_phase2_types,
 725                                                     hdr, resp))
 726                                 return -1;
 727                         return 0;
 728                 }
 729
 730                 if (data->phase2_priv == NULL) {
 731                         data->phase2_method = eap_peer_get_eap_method(
 732                                 data->phase2_type.vendor,
 733                                 data->phase2_type.method);
 734                         if (data->phase2_method) {
 735                                 sm->init_phase2 = 1;
 736                                 sm->mschapv2_full_key = 1;
 737                                 data->phase2_priv =
 738                                         data->phase2_method->init(sm);
 739                                 sm->init_phase2 = 0;
 740                                 sm->mschapv2_full_key = 0;
 741                         }
 742                 }
 743                 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
 744                         wpa_printf(MSG_INFO, "EAP-PEAP: failed to initialize "
 745                                    "Phase 2 EAP method %d", *pos);
 746                         ret->methodState = METHOD_DONE;
 747                         ret->decision = DECISION_FAIL;
 748                         return -1;
 749                 }
 750                 data->phase2_eap_started = 1;
 751                 os_memset(&iret, 0, sizeof(iret));
 752                 *resp = data->phase2_method->process(sm, data->phase2_priv,
 753                                                      &iret, req);
 754                 if ((iret.methodState == METHOD_DONE ||
 755                      iret.methodState == METHOD_MAY_CONT) &&
 756                     (iret.decision == DECISION_UNCOND_SUCC ||
 757                      iret.decision == DECISION_COND_SUCC)) {
 758                         data->phase2_eap_success = 1;
 759                         data->phase2_success = 1;
 760                 }
 761                 break;
 762         }
 763
 764         if (*resp == NULL &&
 765             (config->pending_req_identity || config->pending_req_password ||
 766              config->pending_req_otp || config->pending_req_new_password)) {
 767                 wpabuf_free(data->pending_phase2_req);
 768                 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
 769         }
 770
 771         return 0;
 772 }
 773
 774
 775 static int eap_peap_decrypt(struct eap_sm *sm, struct eap_peap_data *data,
 776                             struct eap_method_ret *ret,
 777                             const struct eap_hdr *req,
 778                             const struct wpabuf *in_data,
 779                             struct wpabuf **out_data)
 780 {
 781         struct wpabuf *in_decrypted = NULL;
 782         int res, skip_change = 0;
 783         struct eap_hdr *hdr, *rhdr;
 784         struct wpabuf *resp = NULL;
 785         size_t len;
 786
 787         wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
 788                    " Phase 2", (unsigned long) wpabuf_len(in_data));
 789
 790         if (data->pending_phase2_req) {
 791                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 request - "
 792                            "skip decryption and use old data");
 793                 /* Clear TLS reassembly state. */
 794                 eap_peer_tls_reset_input(&data->ssl);
 795                 in_decrypted = data->pending_phase2_req;
 796                 data->pending_phase2_req = NULL;
 797                 skip_change = 1;
 798                 goto continue_req;
 799         }
 800
 801         if (wpabuf_len(in_data) == 0 && sm->workaround &&
 802             data->phase2_success) {
 803                 /*
 804                  * Cisco ACS seems to be using TLS ACK to terminate
 805                  * EAP-PEAPv0/GTC. Try to reply with TLS ACK.
 806                  */
 807                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Received TLS ACK, but "
 808                            "expected data - acknowledge with TLS ACK since "
 809                            "Phase 2 has been completed");
 810                 ret->decision = DECISION_COND_SUCC;
 811                 ret->methodState = METHOD_DONE;
 812                 return 1;
 813         } else if (wpabuf_len(in_data) == 0) {
 814                 /* Received TLS ACK - requesting more fragments */
 815                 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
 816                                             data->peap_version,
 817                                             req->identifier, NULL, out_data);
 818         }
 819
 820         res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
 821         if (res)
 822                 return res;
 823
 824 continue_req:
 825         wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
 826                         in_decrypted);
 827
 828         hdr = wpabuf_mhead(in_decrypted);
 829         if (wpabuf_len(in_decrypted) == 5 && hdr->code == EAP_CODE_REQUEST &&
 830             be_to_host16(hdr->length) == 5 &&
 831             eap_get_type(in_decrypted) == EAP_TYPE_IDENTITY) {
 832                 /* At least FreeRADIUS seems to send full EAP header with
 833                  * EAP Request Identity */
 834                 skip_change = 1;
 835         }
 836         if (wpabuf_len(in_decrypted) >= 5 && hdr->code == EAP_CODE_REQUEST &&
 837             eap_get_type(in_decrypted) == EAP_TYPE_TLV) {
 838                 skip_change = 1;
 839         }
 840
 841         if (data->peap_version == 0 && !skip_change) {
 842                 struct eap_hdr *nhdr;
 843                 struct wpabuf *nmsg = wpabuf_alloc(sizeof(struct eap_hdr) +
 844                                                    wpabuf_len(in_decrypted));
 845                 if (nmsg == NULL) {
 846                         wpabuf_free(in_decrypted);
 847                         return 0;
 848                 }
 849                 nhdr = wpabuf_put(nmsg, sizeof(*nhdr));
 850                 wpabuf_put_buf(nmsg, in_decrypted);
 851                 nhdr->code = req->code;
 852                 nhdr->identifier = req->identifier;
 853                 nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
 854                                             wpabuf_len(in_decrypted));
 855
 856                 wpabuf_free(in_decrypted);
 857                 in_decrypted = nmsg;
 858         }
 859
 860         if (data->peap_version >= 2) {
 861                 struct eap_tlv_hdr *tlv;
 862                 struct wpabuf *nmsg;
 863
 864                 if (wpabuf_len(in_decrypted) < sizeof(*tlv) + sizeof(*hdr)) {
 865                         wpa_printf(MSG_INFO, "EAP-PEAPv2: Too short Phase 2 "
 866                                    "EAP TLV");
 867                         wpabuf_free(in_decrypted);
 868                         return 0;
 869                 }
 870                 tlv = wpabuf_mhead(in_decrypted);
 871                 if ((be_to_host16(tlv->tlv_type) & 0x3fff) !=
 872                     EAP_TLV_EAP_PAYLOAD_TLV) {
 873                         wpa_printf(MSG_INFO, "EAP-PEAPv2: Not an EAP TLV");
 874                         wpabuf_free(in_decrypted);
 875                         return 0;
 876                 }
 877                 if (sizeof(*tlv) + be_to_host16(tlv->length) >
 878                     wpabuf_len(in_decrypted)) {
 879                         wpa_printf(MSG_INFO, "EAP-PEAPv2: Invalid EAP TLV "
 880                                    "length");
 881                         wpabuf_free(in_decrypted);
 882                         return 0;
 883                 }
 884                 hdr = (struct eap_hdr *) (tlv + 1);
 885                 if (be_to_host16(hdr->length) > be_to_host16(tlv->length)) {
 886                         wpa_printf(MSG_INFO, "EAP-PEAPv2: No room for full "
 887                                    "EAP packet in EAP TLV");
 888                         wpabuf_free(in_decrypted);
 889                         return 0;
 890                 }
 891
 892                 nmsg = wpabuf_alloc(be_to_host16(hdr->length));
 893                 if (nmsg == NULL) {
 894                         wpabuf_free(in_decrypted);
 895                         return 0;
 896                 }
 897
 898                 wpabuf_put_data(nmsg, hdr, be_to_host16(hdr->length));
 899                 wpabuf_free(in_decrypted);
 900                 in_decrypted = nmsg;
 901         }
 902
 903         hdr = wpabuf_mhead(in_decrypted);
 904         if (wpabuf_len(in_decrypted) < sizeof(*hdr)) {
 905                 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
 906                            "EAP frame (len=%lu)",
 907                            (unsigned long) wpabuf_len(in_decrypted));
 908                 wpabuf_free(in_decrypted);
 909                 return 0;
 910         }
 911         len = be_to_host16(hdr->length);
 912         if (len > wpabuf_len(in_decrypted)) {
 913                 wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
 914                            "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
 915                            (unsigned long) wpabuf_len(in_decrypted),
 916                            (unsigned long) len);
 917                 wpabuf_free(in_decrypted);
 918                 return 0;
 919         }
 920         if (len < wpabuf_len(in_decrypted)) {
 921                 wpa_printf(MSG_INFO, "EAP-PEAP: Odd.. Phase 2 EAP header has "
 922                            "shorter length than full decrypted data "
 923                            "(%lu < %lu)",
 924                            (unsigned long) len,
 925                            (unsigned long) wpabuf_len(in_decrypted));
 926         }
 927         wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
 928                    "identifier=%d length=%lu", hdr->code, hdr->identifier,
 929                    (unsigned long) len);
 930         switch (hdr->code) {
 931         case EAP_CODE_REQUEST:
 932                 if (eap_peap_phase2_request(sm, data, ret, in_decrypted,
 933                                             &resp)) {
 934                         wpabuf_free(in_decrypted);
 935                         wpa_printf(MSG_INFO, "EAP-PEAP: Phase2 Request "
 936                                    "processing failed");
 937                         return 0;
 938                 }
 939                 break;
 940         case EAP_CODE_SUCCESS:
 941                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
 942                 if (data->peap_version == 1) {
 943                         /* EAP-Success within TLS tunnel is used to indicate
 944                          * shutdown of the TLS channel. The authentication has
 945                          * been completed. */
 946                         if (data->phase2_eap_started &&
 947                             !data->phase2_eap_success) {
 948                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 "
 949                                            "Success used to indicate success, "
 950                                            "but Phase 2 EAP was not yet "
 951                                            "completed successfully");
 952                                 ret->methodState = METHOD_DONE;
 953                                 ret->decision = DECISION_FAIL;
 954                                 wpabuf_free(in_decrypted);
 955                                 return 0;
 956                         }
 957                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - "
 958                                    "EAP-Success within TLS tunnel - "
 959                                    "authentication completed");
 960                         ret->decision = DECISION_UNCOND_SUCC;
 961                         ret->methodState = METHOD_DONE;
 962                         data->phase2_success = 1;
 963                         if (data->peap_outer_success == 2) {
 964                                 wpabuf_free(in_decrypted);
 965                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK "
 966                                            "to finish authentication");
 967                                 return 1;
 968                         } else if (data->peap_outer_success == 1) {
 969                                 /* Reply with EAP-Success within the TLS
 970                                  * channel to complete the authentication. */
 971                                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
 972                                 if (resp) {
 973                                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
 974                                         rhdr->code = EAP_CODE_SUCCESS;
 975                                         rhdr->identifier = hdr->identifier;
 976                                         rhdr->length =
 977                                                 host_to_be16(sizeof(*rhdr));
 978                                 }
 979                         } else {
 980                                 /* No EAP-Success expected for Phase 1 (outer,
 981                                  * unencrypted auth), so force EAP state
 982                                  * machine to SUCCESS state. */
 983                                 sm->peap_done = TRUE;
 984                         }
 985                 } else {
 986                         /* FIX: ? */
 987                 }
 988                 break;
 989         case EAP_CODE_FAILURE:
 990                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
 991                 ret->decision = DECISION_FAIL;
 992                 ret->methodState = METHOD_MAY_CONT;
 993                 ret->allowNotifications = FALSE;
 994                 /* Reply with EAP-Failure within the TLS channel to complete
 995                  * failure reporting. */
 996                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
 997                 if (resp) {
 998                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
 999                         rhdr->code = EAP_CODE_FAILURE;
1000                         rhdr->identifier = hdr->identifier;
1001                         rhdr->length = host_to_be16(sizeof(*rhdr));
1002                 }
1003                 break;
1004         default:
1005                 wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
1006                            "Phase 2 EAP header", hdr->code);
1007                 break;
1008         }
1009
1010         wpabuf_free(in_decrypted);
1011
1012         if (resp) {
1013                 int skip_change2 = 0;
1014                 struct wpabuf *rmsg, buf;
1015
1016                 wpa_hexdump_buf_key(MSG_DEBUG,
1017                                     "EAP-PEAP: Encrypting Phase 2 data", resp);
1018                 /* PEAP version changes */
1019                 if (data->peap_version >= 2) {
1020                         resp = eap_peapv2_tlv_eap_payload(resp);
1021                         if (resp == NULL)
1022                                 return -1;
1023                 }
1024                 if (wpabuf_len(resp) >= 5 &&
1025                     wpabuf_head_u8(resp)[0] == EAP_CODE_RESPONSE &&
1026                     eap_get_type(resp) == EAP_TYPE_TLV)
1027                         skip_change2 = 1;
1028                 rmsg = resp;
1029                 if (data->peap_version == 0 && !skip_change2) {
1030                         wpabuf_set(&buf, wpabuf_head_u8(resp) +
1031                                    sizeof(struct eap_hdr),
1032                                    wpabuf_len(resp) - sizeof(struct eap_hdr));
1033                         rmsg = &buf;
1034                 }
1035
1036                 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
1037                                          data->peap_version, req->identifier,
1038                                          rmsg, out_data)) {
1039                         wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt "
1040                                    "a Phase 2 frame");
1041                 }
1042                 wpabuf_free(resp);
1043         }
1044
1045         return 0;
1046 }
1047
1048
1049 static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
1050                                         struct eap_method_ret *ret,
1051                                         const struct wpabuf *reqData)
1052 {
1053         const struct eap_hdr *req;
1054         size_t left;
1055         int res;
1056         u8 flags, id;
1057         struct wpabuf *resp;
1058         const u8 *pos;
1059         struct eap_peap_data *data = priv;
1060
1061         pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret,
1062                                         reqData, &left, &flags);
1063         if (pos == NULL)
1064                 return NULL;
1065         req = wpabuf_head(reqData);
1066         id = req->identifier;
1067
1068         if (flags & EAP_TLS_FLAGS_START) {
1069                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Start (server ver=%d, own "
1070                            "ver=%d)", flags & EAP_PEAP_VERSION_MASK,
1071                         data->peap_version);
1072                 if ((flags & EAP_PEAP_VERSION_MASK) < data->peap_version)
1073                         data->peap_version = flags & EAP_PEAP_VERSION_MASK;
1074                 if (data->force_peap_version >= 0 &&
1075                     data->force_peap_version != data->peap_version) {
1076                         wpa_printf(MSG_WARNING, "EAP-PEAP: Failed to select "
1077                                    "forced PEAP version %d",
1078                                    data->force_peap_version);
1079                         ret->methodState = METHOD_DONE;
1080                         ret->decision = DECISION_FAIL;
1081                         ret->allowNotifications = FALSE;
1082                         return NULL;
1083                 }
1084                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Using PEAP version %d",
1085                            data->peap_version);
1086                 left = 0; /* make sure that this frame is empty, even though it
1087                            * should always be, anyway */
1088         }
1089
1090         resp = NULL;
1091         if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1092             !data->resuming) {
1093                 struct wpabuf msg;
1094                 wpabuf_set(&msg, pos, left);
1095                 res = eap_peap_decrypt(sm, data, ret, req, &msg, &resp);
1096         } else {
1097                 res = eap_peer_tls_process_helper(sm, &data->ssl,
1098                                                   EAP_TYPE_PEAP,
1099                                                   data->peap_version, id, pos,
1100                                                   left, &resp);
1101
1102                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1103                         char *label;
1104                         wpa_printf(MSG_DEBUG,
1105                                    "EAP-PEAP: TLS done, proceed to Phase 2");
1106                         os_free(data->key_data);
1107                         /* draft-josefsson-ppext-eap-tls-eap-05.txt
1108                          * specifies that PEAPv1 would use "client PEAP
1109                          * encryption" as the label. However, most existing
1110                          * PEAPv1 implementations seem to be using the old
1111                          * label, "client EAP encryption", instead. Use the old
1112                          * label by default, but allow it to be configured with
1113                          * phase1 parameter peaplabel=1. */
1114                         if (data->peap_version > 1 || data->force_new_label)
1115                                 label = "client PEAP encryption";
1116                         else
1117                                 label = "client EAP encryption";
1118                         wpa_printf(MSG_DEBUG, "EAP-PEAP: using label '%s' in "
1119                                    "key derivation", label);
1120                         data->key_data =
1121                                 eap_peer_tls_derive_key(sm, &data->ssl, label,
1122                                                         EAP_TLS_KEY_LEN);
1123                         if (data->key_data) {
1124                                 wpa_hexdump_key(MSG_DEBUG,
1125                                                 "EAP-PEAP: Derived key",
1126                                                 data->key_data,
1127                                                 EAP_TLS_KEY_LEN);
1128                         } else {
1129                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to "
1130                                            "derive key");
1131                         }
1132
1133                         if (sm->workaround && data->resuming) {
1134                                 /*
1135                                  * At least few RADIUS servers (Aegis v1.1.6;
1136                                  * but not v1.1.4; and Cisco ACS) seem to be
1137                                  * terminating PEAPv1 (Aegis) or PEAPv0 (Cisco
1138                                  * ACS) session resumption with outer
1139                                  * EAP-Success. This does not seem to follow
1140                                  * draft-josefsson-pppext-eap-tls-eap-05.txt
1141                                  * section 4.2, so only allow this if EAP
1142                                  * workarounds are enabled.
1143                                  */
1144                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Workaround - "
1145                                            "allow outer EAP-Success to "
1146                                            "terminate PEAP resumption");
1147                                 ret->decision = DECISION_COND_SUCC;
1148                                 data->phase2_success = 1;
1149                         }
1150
1151                         data->resuming = 0;
1152                 }
1153
1154                 if (res == 2) {
1155                         struct wpabuf msg;
1156                         /*
1157                          * Application data included in the handshake message.
1158                          */
1159                         wpabuf_free(data->pending_phase2_req);
1160                         data->pending_phase2_req = resp;
1161                         resp = NULL;
1162                         wpabuf_set(&msg, pos, left);
1163                         res = eap_peap_decrypt(sm, data, ret, req, &msg,
1164                                                &resp);
1165                 }
1166         }
1167
1168         if (ret->methodState == METHOD_DONE) {
1169                 ret->allowNotifications = FALSE;
1170         }
1171
1172         if (res == 1) {
1173                 wpabuf_free(resp);
1174                 return eap_peer_tls_build_ack(id, EAP_TYPE_PEAP,
1175                                               data->peap_version);
1176         }
1177
1178         return resp;
1179 }
1180
1181
1182 static Boolean eap_peap_has_reauth_data(struct eap_sm *sm, void *priv)
1183 {
1184         struct eap_peap_data *data = priv;
1185         return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1186                 data->phase2_success;
1187 }
1188
1189
1190 static void eap_peap_deinit_for_reauth(struct eap_sm *sm, void *priv)
1191 {
1192         struct eap_peap_data *data = priv;
1193         wpabuf_free(data->pending_phase2_req);
1194         data->pending_phase2_req = NULL;
1195         data->crypto_binding_used = 0;
1196 }
1197
1198
1199 static void * eap_peap_init_for_reauth(struct eap_sm *sm, void *priv)
1200 {
1201         struct eap_peap_data *data = priv;
1202         os_free(data->key_data);
1203         data->key_data = NULL;
1204         if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1205                 os_free(data);
1206                 return NULL;
1207         }
1208         if (data->phase2_priv && data->phase2_method &&
1209             data->phase2_method->init_for_reauth)
1210                 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1211         data->phase2_success = 0;
1212         data->phase2_eap_success = 0;
1213         data->phase2_eap_started = 0;
1214         data->resuming = 1;
1215         sm->peap_done = FALSE;
1216         return priv;
1217 }
1218
1219
1220 static int eap_peap_get_status(struct eap_sm *sm, void *priv, char *buf,
1221                                size_t buflen, int verbose)
1222 {
1223         struct eap_peap_data *data = priv;
1224         int len, ret;
1225
1226         len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1227         if (data->phase2_method) {
1228                 ret = os_snprintf(buf + len, buflen - len,
1229                                   "EAP-PEAPv%d Phase2 method=%s\n",
1230                                   data->peap_version,
1231                                   data->phase2_method->name);
1232                 if (ret < 0 || (size_t) ret >= buflen - len)
1233                         return len;
1234                 len += ret;
1235         }
1236         return len;
1237 }
1238
1239
1240 static Boolean eap_peap_isKeyAvailable(struct eap_sm *sm, void *priv)
1241 {
1242         struct eap_peap_data *data = priv;
1243         return data->key_data != NULL && data->phase2_success;
1244 }
1245
1246
1247 static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
1248 {
1249         struct eap_peap_data *data = priv;
1250         u8 *key;
1251
1252         if (data->key_data == NULL || !data->phase2_success)
1253                 return NULL;
1254
1255         key = os_malloc(EAP_TLS_KEY_LEN);
1256         if (key == NULL)
1257                 return NULL;
1258
1259         *len = EAP_TLS_KEY_LEN;
1260
1261         if (data->crypto_binding_used) {
1262                 u8 csk[128];
1263                 /*
1264                  * Note: It looks like Microsoft implementation requires null
1265                  * termination for this label while the one used for deriving
1266                  * IPMK|CMK did not use null termination.
1267                  */
1268                 peap_prfplus(data->peap_version, data->ipmk, 40,
1269                              "Session Key Generating Function",
1270                              (u8 *) "\00", 1, csk, sizeof(csk));
1271                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
1272                 os_memcpy(key, csk, EAP_TLS_KEY_LEN);
1273                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1274                             key, EAP_TLS_KEY_LEN);
1275         } else
1276                 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1277
1278         return key;
1279 }
1280
1281
1282 int eap_peer_peap_register(void)
1283 {
1284         struct eap_method *eap;
1285         int ret;
1286
1287         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1288                                     EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
1289         if (eap == NULL)
1290                 return -1;
1291
1292         eap->init = eap_peap_init;
1293         eap->deinit = eap_peap_deinit;
1294         eap->process = eap_peap_process;
1295         eap->isKeyAvailable = eap_peap_isKeyAvailable;
1296         eap->getKey = eap_peap_getKey;
1297         eap->get_status = eap_peap_get_status;
1298         eap->has_reauth_data = eap_peap_has_reauth_data;
1299         eap->deinit_for_reauth = eap_peap_deinit_for_reauth;
1300         eap->init_for_reauth = eap_peap_init_for_reauth;
1301
1302         ret = eap_peer_method_register(eap);
1303         if (ret)
1304                 eap_peer_method_free(eap);
1305         return ret;
1306 }