www.project-moonshot.org Git - mech_eap.orig/blob - libeap/src/eap_peer/eap_peap.c

   1 /*
   2  * EAP peer method: EAP-PEAP (draft-josefsson-pppext-eap-tls-eap-10.txt)
   3  * Copyright (c) 2004-2008, 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 "crypto/tls.h"
  20 #include "eap_common/eap_tlv_common.h"
  21 #include "eap_common/eap_peap_common.h"
  22 #include "eap_i.h"
  23 #include "eap_tls_common.h"
  24 #include "eap_config.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=soh2")) {
 123                 data->soh = 2;
 124                 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
 125         } else if (os_strstr(phase1, "tnc=soh1")) {
 126                 data->soh = 1;
 127                 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 1 enabled");
 128         } else if (os_strstr(phase1, "tnc=soh")) {
 129                 data->soh = 2;
 130                 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
 131         }
 132 #endif /* EAP_TNC */
 133
 134         return 0;
 135 }
 136
 137
 138 static void * eap_peap_init(struct eap_sm *sm)
 139 {
 140         struct eap_peap_data *data;
 141         struct eap_peer_config *config = eap_get_config(sm);
 142
 143         data = os_zalloc(sizeof(*data));
 144         if (data == NULL)
 145                 return NULL;
 146         sm->peap_done = FALSE;
 147         data->peap_version = EAP_PEAP_VERSION;
 148         data->force_peap_version = -1;
 149         data->peap_outer_success = 2;
 150         data->crypto_binding = OPTIONAL_BINDING;
 151
 152         if (config && config->phase1 &&
 153             eap_peap_parse_phase1(data, config->phase1) < 0) {
 154                 eap_peap_deinit(sm, data);
 155                 return NULL;
 156         }
 157
 158         if (eap_peer_select_phase2_methods(config, "auth=",
 159                                            &data->phase2_types,
 160                                            &data->num_phase2_types) < 0) {
 161                 eap_peap_deinit(sm, data);
 162                 return NULL;
 163         }
 164
 165         data->phase2_type.vendor = EAP_VENDOR_IETF;
 166         data->phase2_type.method = EAP_TYPE_NONE;
 167
 168         if (eap_peer_tls_ssl_init(sm, &data->ssl, config)) {
 169                 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
 170                 eap_peap_deinit(sm, data);
 171                 return NULL;
 172         }
 173
 174         return data;
 175 }
 176
 177
 178 static void eap_peap_deinit(struct eap_sm *sm, void *priv)
 179 {
 180         struct eap_peap_data *data = priv;
 181         if (data == NULL)
 182                 return;
 183         if (data->phase2_priv && data->phase2_method)
 184                 data->phase2_method->deinit(sm, data->phase2_priv);
 185         os_free(data->phase2_types);
 186         eap_peer_tls_ssl_deinit(sm, &data->ssl);
 187         os_free(data->key_data);
 188         wpabuf_free(data->pending_phase2_req);
 189         os_free(data);
 190 }
 191
 192
 193 /**
 194  * eap_tlv_build_nak - Build EAP-TLV NAK message
 195  * @id: EAP identifier for the header
 196  * @nak_type: TLV type (EAP_TLV_*)
 197  * Returns: Buffer to the allocated EAP-TLV NAK message or %NULL on failure
 198  *
 199  * This funtion builds an EAP-TLV NAK message. The caller is responsible for
 200  * freeing the returned buffer.
 201  */
 202 static struct wpabuf * eap_tlv_build_nak(int id, u16 nak_type)
 203 {
 204         struct wpabuf *msg;
 205
 206         msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, 10,
 207                             EAP_CODE_RESPONSE, id);
 208         if (msg == NULL)
 209                 return NULL;
 210
 211         wpabuf_put_u8(msg, 0x80); /* Mandatory */
 212         wpabuf_put_u8(msg, EAP_TLV_NAK_TLV);
 213         wpabuf_put_be16(msg, 6); /* Length */
 214         wpabuf_put_be32(msg, 0); /* Vendor-Id */
 215         wpabuf_put_be16(msg, nak_type); /* NAK-Type */
 216
 217         return msg;
 218 }
 219
 220
 221 static int eap_peap_get_isk(struct eap_sm *sm, struct eap_peap_data *data,
 222                             u8 *isk, size_t isk_len)
 223 {
 224         u8 *key;
 225         size_t key_len;
 226
 227         os_memset(isk, 0, isk_len);
 228         if (data->phase2_method == NULL || data->phase2_priv == NULL ||
 229             data->phase2_method->isKeyAvailable == NULL ||
 230             data->phase2_method->getKey == NULL)
 231                 return 0;
 232
 233         if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
 234             (key = data->phase2_method->getKey(sm, data->phase2_priv,
 235                                                &key_len)) == NULL) {
 236                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not get key material "
 237                            "from Phase 2");
 238                 return -1;
 239         }
 240
 241         if (key_len > isk_len)
 242                 key_len = isk_len;
 243         os_memcpy(isk, key, key_len);
 244         os_free(key);
 245
 246         return 0;
 247 }
 248
 249
 250 static int eap_peap_derive_cmk(struct eap_sm *sm, struct eap_peap_data *data)
 251 {
 252         u8 *tk;
 253         u8 isk[32], imck[60];
 254
 255         /*
 256          * Tunnel key (TK) is the first 60 octets of the key generated by
 257          * phase 1 of PEAP (based on TLS).
 258          */
 259         tk = data->key_data;
 260         if (tk == NULL)
 261                 return -1;
 262         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60);
 263
 264         if (data->reauth &&
 265             tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
 266                 /* Fast-connect: IPMK|CMK = TK */
 267                 os_memcpy(data->ipmk, tk, 40);
 268                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK from TK",
 269                                 data->ipmk, 40);
 270                 os_memcpy(data->cmk, tk + 40, 20);
 271                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK from TK",
 272                                 data->cmk, 20);
 273                 return 0;
 274         }
 275
 276         if (eap_peap_get_isk(sm, data, isk, sizeof(isk)) < 0)
 277                 return -1;
 278         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk));
 279
 280         /*
 281          * IPMK Seed = "Inner Methods Compound Keys" | ISK
 282          * TempKey = First 40 octets of TK
 283          * IPMK|CMK = PRF+(TempKey, IPMK Seed, 60)
 284          * (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space
 285          * in the end of the label just before ISK; is that just a typo?)
 286          */
 287         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40);
 288         peap_prfplus(data->peap_version, tk, 40, "Inner Methods Compound Keys",
 289                      isk, sizeof(isk), imck, sizeof(imck));
 290         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
 291                         imck, sizeof(imck));
 292
 293         os_memcpy(data->ipmk, imck, 40);
 294         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
 295         os_memcpy(data->cmk, imck + 40, 20);
 296         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);
 297
 298         return 0;
 299 }
 300
 301
 302 static int eap_tlv_add_cryptobinding(struct eap_sm *sm,
 303                                      struct eap_peap_data *data,
 304                                      struct wpabuf *buf)
 305 {
 306         u8 *mac;
 307         u8 eap_type = EAP_TYPE_PEAP;
 308         const u8 *addr[2];
 309         size_t len[2];
 310         u16 tlv_type;
 311
 312         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
 313         addr[0] = wpabuf_put(buf, 0);
 314         len[0] = 60;
 315         addr[1] = &eap_type;
 316         len[1] = 1;
 317
 318         tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
 319         if (data->peap_version >= 2)
 320                 tlv_type |= EAP_TLV_TYPE_MANDATORY;
 321         wpabuf_put_be16(buf, tlv_type);
 322         wpabuf_put_be16(buf, 56);
 323
 324         wpabuf_put_u8(buf, 0); /* Reserved */
 325         wpabuf_put_u8(buf, data->peap_version); /* Version */
 326         wpabuf_put_u8(buf, data->peap_version); /* RecvVersion */
 327         wpabuf_put_u8(buf, 1); /* SubType: 0 = Request, 1 = Response */
 328         wpabuf_put_data(buf, data->binding_nonce, 32); /* Nonce */
 329         mac = wpabuf_put(buf, 20); /* Compound_MAC */
 330         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK", data->cmk, 20);
 331         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
 332                     addr[0], len[0]);
 333         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
 334                     addr[1], len[1]);
 335         hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac);
 336         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC", mac, SHA1_MAC_LEN);
 337         data->crypto_binding_used = 1;
 338
 339         return 0;
 340 }
 341
 342
 343 /**
 344  * eap_tlv_build_result - Build EAP-TLV Result message
 345  * @id: EAP identifier for the header
 346  * @status: Status (EAP_TLV_RESULT_SUCCESS or EAP_TLV_RESULT_FAILURE)
 347  * Returns: Buffer to the allocated EAP-TLV Result message or %NULL on failure
 348  *
 349  * This funtion builds an EAP-TLV Result message. The caller is responsible for
 350  * freeing the returned buffer.
 351  */
 352 static struct wpabuf * eap_tlv_build_result(struct eap_sm *sm,
 353                                             struct eap_peap_data *data,
 354                                             int crypto_tlv_used,
 355                                             int id, u16 status)
 356 {
 357         struct wpabuf *msg;
 358         size_t len;
 359
 360         if (data->crypto_binding == NO_BINDING)
 361                 crypto_tlv_used = 0;
 362
 363         len = 6;
 364         if (crypto_tlv_used)
 365                 len += 60; /* Cryptobinding TLV */
 366         msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len,
 367                             EAP_CODE_RESPONSE, id);
 368         if (msg == NULL)
 369                 return NULL;
 370
 371         wpabuf_put_u8(msg, 0x80); /* Mandatory */
 372         wpabuf_put_u8(msg, EAP_TLV_RESULT_TLV);
 373         wpabuf_put_be16(msg, 2); /* Length */
 374         wpabuf_put_be16(msg, status); /* Status */
 375
 376         if (crypto_tlv_used && eap_tlv_add_cryptobinding(sm, data, msg)) {
 377                 wpabuf_free(msg);
 378                 return NULL;
 379         }
 380
 381         return msg;
 382 }
 383
 384
 385 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
 386                                           struct eap_peap_data *data,
 387                                           const u8 *crypto_tlv,
 388                                           size_t crypto_tlv_len)
 389 {
 390         u8 buf[61], mac[SHA1_MAC_LEN];
 391         const u8 *pos;
 392
 393         if (eap_peap_derive_cmk(sm, data) < 0) {
 394                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not derive CMK");
 395                 return -1;
 396         }
 397
 398         if (crypto_tlv_len != 4 + 56) {
 399                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
 400                            "length %d", (int) crypto_tlv_len);
 401                 return -1;
 402         }
 403
 404         pos = crypto_tlv;
 405         pos += 4; /* TLV header */
 406         if (pos[1] != data->peap_version) {
 407                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
 408                            "mismatch (was %d; expected %d)",
 409                            pos[1], data->peap_version);
 410                 return -1;
 411         }
 412
 413         if (pos[3] != 0) {
 414                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
 415                            "SubType %d", pos[3]);
 416                 return -1;
 417         }
 418         pos += 4;
 419         os_memcpy(data->binding_nonce, pos, 32);
 420         pos += 32; /* Nonce */
 421
 422         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
 423         os_memcpy(buf, crypto_tlv, 60);
 424         os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
 425         buf[60] = EAP_TYPE_PEAP;
 426         wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Compound_MAC data",
 427                     buf, sizeof(buf));
 428         hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
 429
 430         if (os_memcmp(mac, pos, SHA1_MAC_LEN) != 0) {
 431                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
 432                            "cryptobinding TLV");
 433                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received MAC",
 434                             pos, SHA1_MAC_LEN);
 435                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Expected MAC",
 436                             mac, SHA1_MAC_LEN);
 437                 return -1;
 438         }
 439
 440         wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
 441
 442         return 0;
 443 }
 444
 445
 446 /**
 447  * eap_tlv_process - Process a received EAP-TLV message and generate a response
 448  * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
 449  * @ret: Return values from EAP request validation and processing
 450  * @req: EAP-TLV request to be processed. The caller must have validated that
 451  * the buffer is large enough to contain full request (hdr->length bytes) and
 452  * that the EAP type is EAP_TYPE_TLV.
 453  * @resp: Buffer to return a pointer to the allocated response message. This
 454  * field should be initialized to %NULL before the call. The value will be
 455  * updated if a response message is generated. The caller is responsible for
 456  * freeing the allocated message.
 457  * @force_failure: Force negotiation to fail
 458  * Returns: 0 on success, -1 on failure
 459  */
 460 static int eap_tlv_process(struct eap_sm *sm, struct eap_peap_data *data,
 461                            struct eap_method_ret *ret,
 462                            const struct wpabuf *req, struct wpabuf **resp,
 463                            int force_failure)
 464 {
 465         size_t left, tlv_len;
 466         const u8 *pos;
 467         const u8 *result_tlv = NULL, *crypto_tlv = NULL;
 468         size_t result_tlv_len = 0, crypto_tlv_len = 0;
 469         int tlv_type, mandatory;
 470
 471         /* Parse TLVs */
 472         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, req, &left);
 473         if (pos == NULL)
 474                 return -1;
 475         wpa_hexdump(MSG_DEBUG, "EAP-TLV: Received TLVs", pos, left);
 476         while (left >= 4) {
 477                 mandatory = !!(pos[0] & 0x80);
 478                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
 479                 pos += 2;
 480                 tlv_len = WPA_GET_BE16(pos);
 481                 pos += 2;
 482                 left -= 4;
 483                 if (tlv_len > left) {
 484                         wpa_printf(MSG_DEBUG, "EAP-TLV: TLV underrun "
 485                                    "(tlv_len=%lu left=%lu)",
 486                                    (unsigned long) tlv_len,
 487                                    (unsigned long) left);
 488                         return -1;
 489                 }
 490                 switch (tlv_type) {
 491                 case EAP_TLV_RESULT_TLV:
 492                         result_tlv = pos;
 493                         result_tlv_len = tlv_len;
 494                         break;
 495                 case EAP_TLV_CRYPTO_BINDING_TLV:
 496                         crypto_tlv = pos;
 497                         crypto_tlv_len = tlv_len;
 498                         break;
 499                 default:
 500                         wpa_printf(MSG_DEBUG, "EAP-TLV: Unsupported TLV Type "
 501                                    "%d%s", tlv_type,
 502                                    mandatory ? " (mandatory)" : "");
 503                         if (mandatory) {
 504                                 /* NAK TLV and ignore all TLVs in this packet.
 505                                  */
 506                                 *resp = eap_tlv_build_nak(eap_get_id(req),
 507                                                           tlv_type);
 508                                 return *resp == NULL ? -1 : 0;
 509                         }
 510                         /* Ignore this TLV, but process other TLVs */
 511                         break;
 512                 }
 513
 514                 pos += tlv_len;
 515                 left -= tlv_len;
 516         }
 517         if (left) {
 518                 wpa_printf(MSG_DEBUG, "EAP-TLV: Last TLV too short in "
 519                            "Request (left=%lu)", (unsigned long) left);
 520                 return -1;
 521         }
 522
 523         /* Process supported TLVs */
 524         if (crypto_tlv && data->crypto_binding != NO_BINDING) {
 525                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
 526                             crypto_tlv, crypto_tlv_len);
 527                 if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
 528                                                    crypto_tlv_len + 4) < 0) {
 529                         if (result_tlv == NULL)
 530                                 return -1;
 531                         force_failure = 1;
 532                         crypto_tlv = NULL; /* do not include Cryptobinding TLV
 533                                             * in response, if the received
 534                                             * cryptobinding was invalid. */
 535                 }
 536         } else if (!crypto_tlv && data->crypto_binding == REQUIRE_BINDING) {
 537                 wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
 538                 return -1;
 539         }
 540
 541         if (result_tlv) {
 542                 int status, resp_status;
 543                 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Result TLV",
 544                             result_tlv, result_tlv_len);
 545                 if (result_tlv_len < 2) {
 546                         wpa_printf(MSG_INFO, "EAP-TLV: Too short Result TLV "
 547                                    "(len=%lu)",
 548                                    (unsigned long) result_tlv_len);
 549                         return -1;
 550                 }
 551                 status = WPA_GET_BE16(result_tlv);
 552                 if (status == EAP_TLV_RESULT_SUCCESS) {
 553                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Success "
 554                                    "- EAP-TLV/Phase2 Completed");
 555                         if (force_failure) {
 556                                 wpa_printf(MSG_INFO, "EAP-TLV: Earlier failure"
 557                                            " - force failed Phase 2");
 558                                 resp_status = EAP_TLV_RESULT_FAILURE;
 559                                 ret->decision = DECISION_FAIL;
 560                         } else {
 561                                 resp_status = EAP_TLV_RESULT_SUCCESS;
 562                                 ret->decision = DECISION_UNCOND_SUCC;
 563                         }
 564                 } else if (status == EAP_TLV_RESULT_FAILURE) {
 565                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Failure");
 566                         resp_status = EAP_TLV_RESULT_FAILURE;
 567                         ret->decision = DECISION_FAIL;
 568                 } else {
 569                         wpa_printf(MSG_INFO, "EAP-TLV: Unknown TLV Result "
 570                                    "Status %d", status);
 571                         resp_status = EAP_TLV_RESULT_FAILURE;
 572                         ret->decision = DECISION_FAIL;
 573                 }
 574                 ret->methodState = METHOD_DONE;
 575
 576                 *resp = eap_tlv_build_result(sm, data, crypto_tlv != NULL,
 577                                              eap_get_id(req), resp_status);
 578         }
 579
 580         return 0;
 581 }
 582
 583
 584 static struct wpabuf * eap_peapv2_tlv_eap_payload(struct wpabuf *buf)
 585 {
 586         struct wpabuf *e;
 587         struct eap_tlv_hdr *tlv;
 588
 589         if (buf == NULL)
 590                 return NULL;
 591
 592         /* Encapsulate EAP packet in EAP-Payload TLV */
 593         wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Add EAP-Payload TLV");
 594         e = wpabuf_alloc(sizeof(*tlv) + wpabuf_len(buf));
 595         if (e == NULL) {
 596                 wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Failed to allocate memory "
 597                            "for TLV encapsulation");
 598                 wpabuf_free(buf);
 599                 return NULL;
 600         }
 601         tlv = wpabuf_put(e, sizeof(*tlv));
 602         tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 603                                      EAP_TLV_EAP_PAYLOAD_TLV);
 604         tlv->length = host_to_be16(wpabuf_len(buf));
 605         wpabuf_put_buf(e, buf);
 606         wpabuf_free(buf);
 607         return e;
 608 }
 609
 610
 611 static int eap_peap_phase2_request(struct eap_sm *sm,
 612                                    struct eap_peap_data *data,
 613                                    struct eap_method_ret *ret,
 614                                    struct wpabuf *req,
 615                                    struct wpabuf **resp)
 616 {
 617         struct eap_hdr *hdr = wpabuf_mhead(req);
 618         size_t len = be_to_host16(hdr->length);
 619         u8 *pos;
 620         struct eap_method_ret iret;
 621         struct eap_peer_config *config = eap_get_config(sm);
 622
 623         if (len <= sizeof(struct eap_hdr)) {
 624                 wpa_printf(MSG_INFO, "EAP-PEAP: too short "
 625                            "Phase 2 request (len=%lu)", (unsigned long) len);
 626                 return -1;
 627         }
 628         pos = (u8 *) (hdr + 1);
 629         wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Request: type=%d", *pos);
 630         switch (*pos) {
 631         case EAP_TYPE_IDENTITY:
 632                 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
 633                 break;
 634         case EAP_TYPE_TLV:
 635                 os_memset(&iret, 0, sizeof(iret));
 636                 if (eap_tlv_process(sm, data, &iret, req, resp,
 637                                     data->phase2_eap_started &&
 638                                     !data->phase2_eap_success)) {
 639                         ret->methodState = METHOD_DONE;
 640                         ret->decision = DECISION_FAIL;
 641                         return -1;
 642                 }
 643                 if (iret.methodState == METHOD_DONE ||
 644                     iret.methodState == METHOD_MAY_CONT) {
 645                         ret->methodState = iret.methodState;
 646                         ret->decision = iret.decision;
 647                         data->phase2_success = 1;
 648                 }
 649                 break;
 650         case EAP_TYPE_EXPANDED:
 651 #ifdef EAP_TNC
 652                 if (data->soh) {
 653                         const u8 *epos;
 654                         size_t eleft;
 655
 656                         epos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21,
 657                                                 req, &eleft);
 658                         if (epos) {
 659                                 struct wpabuf *buf;
 660                                 wpa_printf(MSG_DEBUG,
 661                                            "EAP-PEAP: SoH EAP Extensions");
 662                                 buf = tncc_process_soh_request(data->soh,
 663                                                                epos, eleft);
 664                                 if (buf) {
 665                                         *resp = eap_msg_alloc(
 666                                                 EAP_VENDOR_MICROSOFT, 0x21,
 667                                                 wpabuf_len(buf),
 668                                                 EAP_CODE_RESPONSE,
 669                                                 hdr->identifier);
 670                                         if (*resp == NULL) {
 671                                                 ret->methodState = METHOD_DONE;
 672                                                 ret->decision = DECISION_FAIL;
 673                                                 return -1;
 674                                         }
 675                                         wpabuf_put_buf(*resp, buf);
 676                                         wpabuf_free(buf);
 677                                         break;
 678                                 }
 679                         }
 680                 }
 681 #endif /* EAP_TNC */
 682                 /* fall through */
 683         default:
 684                 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
 685                     data->phase2_type.method == EAP_TYPE_NONE) {
 686                         size_t i;
 687                         for (i = 0; i < data->num_phase2_types; i++) {
 688                                 if (data->phase2_types[i].vendor !=
 689                                     EAP_VENDOR_IETF ||
 690                                     data->phase2_types[i].method != *pos)
 691                                         continue;
 692
 693                                 data->phase2_type.vendor =
 694                                         data->phase2_types[i].vendor;
 695                                 data->phase2_type.method =
 696                                         data->phase2_types[i].method;
 697                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Selected "
 698                                            "Phase 2 EAP vendor %d method %d",
 699                                            data->phase2_type.vendor,
 700                                            data->phase2_type.method);
 701                                 break;
 702                         }
 703                 }
 704                 if (*pos != data->phase2_type.method ||
 705                     *pos == EAP_TYPE_NONE) {
 706                         if (eap_peer_tls_phase2_nak(data->phase2_types,
 707                                                     data->num_phase2_types,
 708                                                     hdr, resp))
 709                                 return -1;
 710                         return 0;
 711                 }
 712
 713                 if (data->phase2_priv == NULL) {
 714                         data->phase2_method = eap_peer_get_eap_method(
 715                                 data->phase2_type.vendor,
 716                                 data->phase2_type.method);
 717                         if (data->phase2_method) {
 718                                 sm->init_phase2 = 1;
 719                                 data->phase2_priv =
 720                                         data->phase2_method->init(sm);
 721                                 sm->init_phase2 = 0;
 722                         }
 723                 }
 724                 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
 725                         wpa_printf(MSG_INFO, "EAP-PEAP: failed to initialize "
 726                                    "Phase 2 EAP method %d", *pos);
 727                         ret->methodState = METHOD_DONE;
 728                         ret->decision = DECISION_FAIL;
 729                         return -1;
 730                 }
 731                 data->phase2_eap_started = 1;
 732                 os_memset(&iret, 0, sizeof(iret));
 733                 *resp = data->phase2_method->process(sm, data->phase2_priv,
 734                                                      &iret, req);
 735                 if ((iret.methodState == METHOD_DONE ||
 736                      iret.methodState == METHOD_MAY_CONT) &&
 737                     (iret.decision == DECISION_UNCOND_SUCC ||
 738                      iret.decision == DECISION_COND_SUCC)) {
 739                         data->phase2_eap_success = 1;
 740                         data->phase2_success = 1;
 741                 }
 742                 break;
 743         }
 744
 745         if (*resp == NULL &&
 746             (config->pending_req_identity || config->pending_req_password ||
 747              config->pending_req_otp || config->pending_req_new_password)) {
 748                 wpabuf_free(data->pending_phase2_req);
 749                 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
 750         }
 751
 752         return 0;
 753 }
 754
 755
 756 static int eap_peap_decrypt(struct eap_sm *sm, struct eap_peap_data *data,
 757                             struct eap_method_ret *ret,
 758                             const struct eap_hdr *req,
 759                             const struct wpabuf *in_data,
 760                             struct wpabuf **out_data)
 761 {
 762         struct wpabuf *in_decrypted = NULL;
 763         int res, skip_change = 0;
 764         struct eap_hdr *hdr, *rhdr;
 765         struct wpabuf *resp = NULL;
 766         size_t len;
 767
 768         wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
 769                    " Phase 2", (unsigned long) wpabuf_len(in_data));
 770
 771         if (data->pending_phase2_req) {
 772                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 request - "
 773                            "skip decryption and use old data");
 774                 /* Clear TLS reassembly state. */
 775                 eap_peer_tls_reset_input(&data->ssl);
 776                 in_decrypted = data->pending_phase2_req;
 777                 data->pending_phase2_req = NULL;
 778                 skip_change = 1;
 779                 goto continue_req;
 780         }
 781
 782         if (wpabuf_len(in_data) == 0 && sm->workaround &&
 783             data->phase2_success) {
 784                 /*
 785                  * Cisco ACS seems to be using TLS ACK to terminate
 786                  * EAP-PEAPv0/GTC. Try to reply with TLS ACK.
 787                  */
 788                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Received TLS ACK, but "
 789                            "expected data - acknowledge with TLS ACK since "
 790                            "Phase 2 has been completed");
 791                 ret->decision = DECISION_COND_SUCC;
 792                 ret->methodState = METHOD_DONE;
 793                 return 1;
 794         } else if (wpabuf_len(in_data) == 0) {
 795                 /* Received TLS ACK - requesting more fragments */
 796                 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
 797                                             data->peap_version,
 798                                             req->identifier, NULL, out_data);
 799         }
 800
 801         res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
 802         if (res)
 803                 return res;
 804
 805 continue_req:
 806         wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
 807                         in_decrypted);
 808
 809         hdr = wpabuf_mhead(in_decrypted);
 810         if (wpabuf_len(in_decrypted) == 5 && hdr->code == EAP_CODE_REQUEST &&
 811             be_to_host16(hdr->length) == 5 &&
 812             eap_get_type(in_decrypted) == EAP_TYPE_IDENTITY) {
 813                 /* At least FreeRADIUS seems to send full EAP header with
 814                  * EAP Request Identity */
 815                 skip_change = 1;
 816         }
 817         if (wpabuf_len(in_decrypted) >= 5 && hdr->code == EAP_CODE_REQUEST &&
 818             eap_get_type(in_decrypted) == EAP_TYPE_TLV) {
 819                 skip_change = 1;
 820         }
 821
 822         if (data->peap_version == 0 && !skip_change) {
 823                 struct eap_hdr *nhdr;
 824                 struct wpabuf *nmsg = wpabuf_alloc(sizeof(struct eap_hdr) +
 825                                                    wpabuf_len(in_decrypted));
 826                 if (nmsg == NULL) {
 827                         wpabuf_free(in_decrypted);
 828                         return 0;
 829                 }
 830                 nhdr = wpabuf_put(nmsg, sizeof(*nhdr));
 831                 wpabuf_put_buf(nmsg, in_decrypted);
 832                 nhdr->code = req->code;
 833                 nhdr->identifier = req->identifier;
 834                 nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
 835                                             wpabuf_len(in_decrypted));
 836
 837                 wpabuf_free(in_decrypted);
 838                 in_decrypted = nmsg;
 839         }
 840
 841         if (data->peap_version >= 2) {
 842                 struct eap_tlv_hdr *tlv;
 843                 struct wpabuf *nmsg;
 844
 845                 if (wpabuf_len(in_decrypted) < sizeof(*tlv) + sizeof(*hdr)) {
 846                         wpa_printf(MSG_INFO, "EAP-PEAPv2: Too short Phase 2 "
 847                                    "EAP TLV");
 848                         wpabuf_free(in_decrypted);
 849                         return 0;
 850                 }
 851                 tlv = wpabuf_mhead(in_decrypted);
 852                 if ((be_to_host16(tlv->tlv_type) & 0x3fff) !=
 853                     EAP_TLV_EAP_PAYLOAD_TLV) {
 854                         wpa_printf(MSG_INFO, "EAP-PEAPv2: Not an EAP TLV");
 855                         wpabuf_free(in_decrypted);
 856                         return 0;
 857                 }
 858                 if (sizeof(*tlv) + be_to_host16(tlv->length) >
 859                     wpabuf_len(in_decrypted)) {
 860                         wpa_printf(MSG_INFO, "EAP-PEAPv2: Invalid EAP TLV "
 861                                    "length");
 862                         wpabuf_free(in_decrypted);
 863                         return 0;
 864                 }
 865                 hdr = (struct eap_hdr *) (tlv + 1);
 866                 if (be_to_host16(hdr->length) > be_to_host16(tlv->length)) {
 867                         wpa_printf(MSG_INFO, "EAP-PEAPv2: No room for full "
 868                                    "EAP packet in EAP TLV");
 869                         wpabuf_free(in_decrypted);
 870                         return 0;
 871                 }
 872
 873                 nmsg = wpabuf_alloc(be_to_host16(hdr->length));
 874                 if (nmsg == NULL) {
 875                         wpabuf_free(in_decrypted);
 876                         return 0;
 877                 }
 878
 879                 wpabuf_put_data(nmsg, hdr, be_to_host16(hdr->length));
 880                 wpabuf_free(in_decrypted);
 881                 in_decrypted = nmsg;
 882         }
 883
 884         hdr = wpabuf_mhead(in_decrypted);
 885         if (wpabuf_len(in_decrypted) < sizeof(*hdr)) {
 886                 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
 887                            "EAP frame (len=%lu)",
 888                            (unsigned long) wpabuf_len(in_decrypted));
 889                 wpabuf_free(in_decrypted);
 890                 return 0;
 891         }
 892         len = be_to_host16(hdr->length);
 893         if (len > wpabuf_len(in_decrypted)) {
 894                 wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
 895                            "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
 896                            (unsigned long) wpabuf_len(in_decrypted),
 897                            (unsigned long) len);
 898                 wpabuf_free(in_decrypted);
 899                 return 0;
 900         }
 901         if (len < wpabuf_len(in_decrypted)) {
 902                 wpa_printf(MSG_INFO, "EAP-PEAP: Odd.. Phase 2 EAP header has "
 903                            "shorter length than full decrypted data "
 904                            "(%lu < %lu)",
 905                            (unsigned long) len,
 906                            (unsigned long) wpabuf_len(in_decrypted));
 907         }
 908         wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
 909                    "identifier=%d length=%lu", hdr->code, hdr->identifier,
 910                    (unsigned long) len);
 911         switch (hdr->code) {
 912         case EAP_CODE_REQUEST:
 913                 if (eap_peap_phase2_request(sm, data, ret, in_decrypted,
 914                                             &resp)) {
 915                         wpabuf_free(in_decrypted);
 916                         wpa_printf(MSG_INFO, "EAP-PEAP: Phase2 Request "
 917                                    "processing failed");
 918                         return 0;
 919                 }
 920                 break;
 921         case EAP_CODE_SUCCESS:
 922                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
 923                 if (data->peap_version == 1) {
 924                         /* EAP-Success within TLS tunnel is used to indicate
 925                          * shutdown of the TLS channel. The authentication has
 926                          * been completed. */
 927                         if (data->phase2_eap_started &&
 928                             !data->phase2_eap_success) {
 929                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 "
 930                                            "Success used to indicate success, "
 931                                            "but Phase 2 EAP was not yet "
 932                                            "completed successfully");
 933                                 ret->methodState = METHOD_DONE;
 934                                 ret->decision = DECISION_FAIL;
 935                                 wpabuf_free(in_decrypted);
 936                                 return 0;
 937                         }
 938                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - "
 939                                    "EAP-Success within TLS tunnel - "
 940                                    "authentication completed");
 941                         ret->decision = DECISION_UNCOND_SUCC;
 942                         ret->methodState = METHOD_DONE;
 943                         data->phase2_success = 1;
 944                         if (data->peap_outer_success == 2) {
 945                                 wpabuf_free(in_decrypted);
 946                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK "
 947                                            "to finish authentication");
 948                                 return 1;
 949                         } else if (data->peap_outer_success == 1) {
 950                                 /* Reply with EAP-Success within the TLS
 951                                  * channel to complete the authentication. */
 952                                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
 953                                 if (resp) {
 954                                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
 955                                         rhdr->code = EAP_CODE_SUCCESS;
 956                                         rhdr->identifier = hdr->identifier;
 957                                         rhdr->length =
 958                                                 host_to_be16(sizeof(*rhdr));
 959                                 }
 960                         } else {
 961                                 /* No EAP-Success expected for Phase 1 (outer,
 962                                  * unencrypted auth), so force EAP state
 963                                  * machine to SUCCESS state. */
 964                                 sm->peap_done = TRUE;
 965                         }
 966                 } else {
 967                         /* FIX: ? */
 968                 }
 969                 break;
 970         case EAP_CODE_FAILURE:
 971                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
 972                 ret->decision = DECISION_FAIL;
 973                 ret->methodState = METHOD_MAY_CONT;
 974                 ret->allowNotifications = FALSE;
 975                 /* Reply with EAP-Failure within the TLS channel to complete
 976                  * failure reporting. */
 977                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
 978                 if (resp) {
 979                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
 980                         rhdr->code = EAP_CODE_FAILURE;
 981                         rhdr->identifier = hdr->identifier;
 982                         rhdr->length = host_to_be16(sizeof(*rhdr));
 983                 }
 984                 break;
 985         default:
 986                 wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
 987                            "Phase 2 EAP header", hdr->code);
 988                 break;
 989         }
 990
 991         wpabuf_free(in_decrypted);
 992
 993         if (resp) {
 994                 int skip_change2 = 0;
 995                 struct wpabuf *rmsg, buf;
 996
 997                 wpa_hexdump_buf_key(MSG_DEBUG,
 998                                     "EAP-PEAP: Encrypting Phase 2 data", resp);
 999                 /* PEAP version changes */
1000                 if (data->peap_version >= 2) {
1001                         resp = eap_peapv2_tlv_eap_payload(resp);
1002                         if (resp == NULL)
1003                                 return -1;
1004                 }
1005                 if (wpabuf_len(resp) >= 5 &&
1006                     wpabuf_head_u8(resp)[0] == EAP_CODE_RESPONSE &&
1007                     eap_get_type(resp) == EAP_TYPE_TLV)
1008                         skip_change2 = 1;
1009                 rmsg = resp;
1010                 if (data->peap_version == 0 && !skip_change2) {
1011                         wpabuf_set(&buf, wpabuf_head_u8(resp) +
1012                                    sizeof(struct eap_hdr),
1013                                    wpabuf_len(resp) - sizeof(struct eap_hdr));
1014                         rmsg = &buf;
1015                 }
1016
1017                 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
1018                                          data->peap_version, req->identifier,
1019                                          rmsg, out_data)) {
1020                         wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt "
1021                                    "a Phase 2 frame");
1022                 }
1023                 wpabuf_free(resp);
1024         }
1025
1026         return 0;
1027 }
1028
1029
1030 static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
1031                                         struct eap_method_ret *ret,
1032                                         const struct wpabuf *reqData)
1033 {
1034         const struct eap_hdr *req;
1035         size_t left;
1036         int res;
1037         u8 flags, id;
1038         struct wpabuf *resp;
1039         const u8 *pos;
1040         struct eap_peap_data *data = priv;
1041
1042         pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret,
1043                                         reqData, &left, &flags);
1044         if (pos == NULL)
1045                 return NULL;
1046         req = wpabuf_head(reqData);
1047         id = req->identifier;
1048
1049         if (flags & EAP_TLS_FLAGS_START) {
1050                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Start (server ver=%d, own "
1051                            "ver=%d)", flags & EAP_TLS_VERSION_MASK,
1052                         data->peap_version);
1053                 if ((flags & EAP_TLS_VERSION_MASK) < data->peap_version)
1054                         data->peap_version = flags & EAP_TLS_VERSION_MASK;
1055                 if (data->force_peap_version >= 0 &&
1056                     data->force_peap_version != data->peap_version) {
1057                         wpa_printf(MSG_WARNING, "EAP-PEAP: Failed to select "
1058                                    "forced PEAP version %d",
1059                                    data->force_peap_version);
1060                         ret->methodState = METHOD_DONE;
1061                         ret->decision = DECISION_FAIL;
1062                         ret->allowNotifications = FALSE;
1063                         return NULL;
1064                 }
1065                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Using PEAP version %d",
1066                            data->peap_version);
1067                 left = 0; /* make sure that this frame is empty, even though it
1068                            * should always be, anyway */
1069         }
1070
1071         resp = NULL;
1072         if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1073             !data->resuming) {
1074                 struct wpabuf msg;
1075                 wpabuf_set(&msg, pos, left);
1076                 res = eap_peap_decrypt(sm, data, ret, req, &msg, &resp);
1077         } else {
1078                 res = eap_peer_tls_process_helper(sm, &data->ssl,
1079                                                   EAP_TYPE_PEAP,
1080                                                   data->peap_version, id, pos,
1081                                                   left, &resp);
1082
1083                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1084                         char *label;
1085                         wpa_printf(MSG_DEBUG,
1086                                    "EAP-PEAP: TLS done, proceed to Phase 2");
1087                         os_free(data->key_data);
1088                         /* draft-josefsson-ppext-eap-tls-eap-05.txt
1089                          * specifies that PEAPv1 would use "client PEAP
1090                          * encryption" as the label. However, most existing
1091                          * PEAPv1 implementations seem to be using the old
1092                          * label, "client EAP encryption", instead. Use the old
1093                          * label by default, but allow it to be configured with
1094                          * phase1 parameter peaplabel=1. */
1095                         if (data->peap_version > 1 || data->force_new_label)
1096                                 label = "client PEAP encryption";
1097                         else
1098                                 label = "client EAP encryption";
1099                         wpa_printf(MSG_DEBUG, "EAP-PEAP: using label '%s' in "
1100                                    "key derivation", label);
1101                         data->key_data =
1102                                 eap_peer_tls_derive_key(sm, &data->ssl, label,
1103                                                         EAP_TLS_KEY_LEN);
1104                         if (data->key_data) {
1105                                 wpa_hexdump_key(MSG_DEBUG,
1106                                                 "EAP-PEAP: Derived key",
1107                                                 data->key_data,
1108                                                 EAP_TLS_KEY_LEN);
1109                         } else {
1110                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to "
1111                                            "derive key");
1112                         }
1113
1114                         if (sm->workaround && data->resuming) {
1115                                 /*
1116                                  * At least few RADIUS servers (Aegis v1.1.6;
1117                                  * but not v1.1.4; and Cisco ACS) seem to be
1118                                  * terminating PEAPv1 (Aegis) or PEAPv0 (Cisco
1119                                  * ACS) session resumption with outer
1120                                  * EAP-Success. This does not seem to follow
1121                                  * draft-josefsson-pppext-eap-tls-eap-05.txt
1122                                  * section 4.2, so only allow this if EAP
1123                                  * workarounds are enabled.
1124                                  */
1125                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Workaround - "
1126                                            "allow outer EAP-Success to "
1127                                            "terminate PEAP resumption");
1128                                 ret->decision = DECISION_COND_SUCC;
1129                                 data->phase2_success = 1;
1130                         }
1131
1132                         data->resuming = 0;
1133                 }
1134
1135                 if (res == 2) {
1136                         struct wpabuf msg;
1137                         /*
1138                          * Application data included in the handshake message.
1139                          */
1140                         wpabuf_free(data->pending_phase2_req);
1141                         data->pending_phase2_req = resp;
1142                         resp = NULL;
1143                         wpabuf_set(&msg, pos, left);
1144                         res = eap_peap_decrypt(sm, data, ret, req, &msg,
1145                                                &resp);
1146                 }
1147         }
1148
1149         if (ret->methodState == METHOD_DONE) {
1150                 ret->allowNotifications = FALSE;
1151         }
1152
1153         if (res == 1) {
1154                 wpabuf_free(resp);
1155                 return eap_peer_tls_build_ack(id, EAP_TYPE_PEAP,
1156                                               data->peap_version);
1157         }
1158
1159         return resp;
1160 }
1161
1162
1163 static Boolean eap_peap_has_reauth_data(struct eap_sm *sm, void *priv)
1164 {
1165         struct eap_peap_data *data = priv;
1166         return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1167                 data->phase2_success;
1168 }
1169
1170
1171 static void eap_peap_deinit_for_reauth(struct eap_sm *sm, void *priv)
1172 {
1173         struct eap_peap_data *data = priv;
1174         wpabuf_free(data->pending_phase2_req);
1175         data->pending_phase2_req = NULL;
1176         data->crypto_binding_used = 0;
1177 }
1178
1179
1180 static void * eap_peap_init_for_reauth(struct eap_sm *sm, void *priv)
1181 {
1182         struct eap_peap_data *data = priv;
1183         os_free(data->key_data);
1184         data->key_data = NULL;
1185         if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1186                 os_free(data);
1187                 return NULL;
1188         }
1189         if (data->phase2_priv && data->phase2_method &&
1190             data->phase2_method->init_for_reauth)
1191                 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1192         data->phase2_success = 0;
1193         data->phase2_eap_success = 0;
1194         data->phase2_eap_started = 0;
1195         data->resuming = 1;
1196         data->reauth = 1;
1197         sm->peap_done = FALSE;
1198         return priv;
1199 }
1200
1201
1202 static int eap_peap_get_status(struct eap_sm *sm, void *priv, char *buf,
1203                                size_t buflen, int verbose)
1204 {
1205         struct eap_peap_data *data = priv;
1206         int len, ret;
1207
1208         len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1209         if (data->phase2_method) {
1210                 ret = os_snprintf(buf + len, buflen - len,
1211                                   "EAP-PEAPv%d Phase2 method=%s\n",
1212                                   data->peap_version,
1213                                   data->phase2_method->name);
1214                 if (ret < 0 || (size_t) ret >= buflen - len)
1215                         return len;
1216                 len += ret;
1217         }
1218         return len;
1219 }
1220
1221
1222 static Boolean eap_peap_isKeyAvailable(struct eap_sm *sm, void *priv)
1223 {
1224         struct eap_peap_data *data = priv;
1225         return data->key_data != NULL && data->phase2_success;
1226 }
1227
1228
1229 static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
1230 {
1231         struct eap_peap_data *data = priv;
1232         u8 *key;
1233
1234         if (data->key_data == NULL || !data->phase2_success)
1235                 return NULL;
1236
1237         key = os_malloc(EAP_TLS_KEY_LEN);
1238         if (key == NULL)
1239                 return NULL;
1240
1241         *len = EAP_TLS_KEY_LEN;
1242
1243         if (data->crypto_binding_used) {
1244                 u8 csk[128];
1245                 /*
1246                  * Note: It looks like Microsoft implementation requires null
1247                  * termination for this label while the one used for deriving
1248                  * IPMK|CMK did not use null termination.
1249                  */
1250                 peap_prfplus(data->peap_version, data->ipmk, 40,
1251                              "Session Key Generating Function",
1252                              (u8 *) "\00", 1, csk, sizeof(csk));
1253                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
1254                 os_memcpy(key, csk, EAP_TLS_KEY_LEN);
1255                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1256                             key, EAP_TLS_KEY_LEN);
1257         } else
1258                 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1259
1260         return key;
1261 }
1262
1263
1264 int eap_peer_peap_register(void)
1265 {
1266         struct eap_method *eap;
1267         int ret;
1268
1269         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1270                                     EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
1271         if (eap == NULL)
1272                 return -1;
1273
1274         eap->init = eap_peap_init;
1275         eap->deinit = eap_peap_deinit;
1276         eap->process = eap_peap_process;
1277         eap->isKeyAvailable = eap_peap_isKeyAvailable;
1278         eap->getKey = eap_peap_getKey;
1279         eap->get_status = eap_peap_get_status;
1280         eap->has_reauth_data = eap_peap_has_reauth_data;
1281         eap->deinit_for_reauth = eap_peap_deinit_for_reauth;
1282         eap->init_for_reauth = eap_peap_init_for_reauth;
1283
1284         ret = eap_peer_method_register(eap);
1285         if (ret)
1286                 eap_peer_method_free(eap);
1287         return ret;
1288 }