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