src/eap_peer/eap_peap.c

   1 /*
   2  * EAP peer method: EAP-PEAP (draft-josefsson-pppext-eap-tls-eap-10.txt)
   3  * Copyright (c) 2004-2015, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "crypto/sha1.h"
  13 #include "crypto/tls.h"
  14 #include "eap_common/eap_tlv_common.h"
  15 #include "eap_common/eap_peap_common.h"
  16 #include "eap_i.h"
  17 #include "eap_tls_common.h"
  18 #include "eap_config.h"
  19 #include "tncc.h"
  20
  21
  22 /* Maximum supported PEAP version
  23  * 0 = Microsoft's PEAP version 0; draft-kamath-pppext-peapv0-00.txt
  24  * 1 = draft-josefsson-ppext-eap-tls-eap-05.txt
  25  */
  26 #define EAP_PEAP_VERSION 1
  27
  28
  29 static void eap_peap_deinit(struct eap_sm *sm, void *priv);
  30
  31
  32 struct eap_peap_data {
  33         struct eap_ssl_data ssl;
  34
  35         int peap_version, force_peap_version, force_new_label;
  36
  37         const struct eap_method *phase2_method;
  38         void *phase2_priv;
  39         int phase2_success;
  40         int phase2_eap_success;
  41         int phase2_eap_started;
  42
  43         struct eap_method_type phase2_type;
  44         struct eap_method_type *phase2_types;
  45         size_t num_phase2_types;
  46
  47         int peap_outer_success; /* 0 = PEAP terminated on Phase 2 inner
  48                                  * EAP-Success
  49                                  * 1 = reply with tunneled EAP-Success to inner
  50                                  * EAP-Success and expect AS to send outer
  51                                  * (unencrypted) EAP-Success after this
  52                                  * 2 = reply with PEAP/TLS ACK to inner
  53                                  * EAP-Success and expect AS to send outer
  54                                  * (unencrypted) EAP-Success after this */
  55         int resuming; /* starting a resumed session */
  56         int reauth; /* reauthentication */
  57         u8 *key_data;
  58         u8 *session_id;
  59         size_t id_len;
  60
  61         struct wpabuf *pending_phase2_req;
  62         struct wpabuf *pending_resp;
  63         enum { NO_BINDING, OPTIONAL_BINDING, REQUIRE_BINDING } crypto_binding;
  64         int crypto_binding_used;
  65         u8 binding_nonce[32];
  66         u8 ipmk[40];
  67         u8 cmk[20];
  68         int soh; /* Whether IF-TNCCS-SOH (Statement of Health; Microsoft NAP)
  69                   * is enabled. */
  70 };
  71
  72
  73 static void eap_peap_parse_phase1(struct eap_peap_data *data,
  74                                   const char *phase1)
  75 {
  76         const char *pos;
  77
  78         pos = os_strstr(phase1, "peapver=");
  79         if (pos) {
  80                 data->force_peap_version = atoi(pos + 8);
  81                 data->peap_version = data->force_peap_version;
  82                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Forced PEAP version %d",
  83                            data->force_peap_version);
  84         }
  85
  86         if (os_strstr(phase1, "peaplabel=1")) {
  87                 data->force_new_label = 1;
  88                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Force new label for key "
  89                            "derivation");
  90         }
  91
  92         if (os_strstr(phase1, "peap_outer_success=0")) {
  93                 data->peap_outer_success = 0;
  94                 wpa_printf(MSG_DEBUG, "EAP-PEAP: terminate authentication on "
  95                            "tunneled EAP-Success");
  96         } else if (os_strstr(phase1, "peap_outer_success=1")) {
  97                 data->peap_outer_success = 1;
  98                 wpa_printf(MSG_DEBUG, "EAP-PEAP: send tunneled EAP-Success "
  99                            "after receiving tunneled EAP-Success");
 100         } else if (os_strstr(phase1, "peap_outer_success=2")) {
 101                 data->peap_outer_success = 2;
 102                 wpa_printf(MSG_DEBUG, "EAP-PEAP: send PEAP/TLS ACK after "
 103                            "receiving tunneled EAP-Success");
 104         }
 105
 106         if (os_strstr(phase1, "crypto_binding=0")) {
 107                 data->crypto_binding = NO_BINDING;
 108                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Do not use cryptobinding");
 109         } else if (os_strstr(phase1, "crypto_binding=1")) {
 110                 data->crypto_binding = OPTIONAL_BINDING;
 111                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Optional cryptobinding");
 112         } else if (os_strstr(phase1, "crypto_binding=2")) {
 113                 data->crypto_binding = REQUIRE_BINDING;
 114                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Require cryptobinding");
 115         }
 116
 117 #ifdef EAP_TNC
 118         if (os_strstr(phase1, "tnc=soh2")) {
 119                 data->soh = 2;
 120                 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
 121         } else if (os_strstr(phase1, "tnc=soh1")) {
 122                 data->soh = 1;
 123                 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 1 enabled");
 124         } else if (os_strstr(phase1, "tnc=soh")) {
 125                 data->soh = 2;
 126                 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
 127         }
 128 #endif /* EAP_TNC */
 129 }
 130
 131
 132 static void * eap_peap_init(struct eap_sm *sm)
 133 {
 134         struct eap_peap_data *data;
 135         struct eap_peer_config *config = eap_get_config(sm);
 136
 137         data = os_zalloc(sizeof(*data));
 138         if (data == NULL)
 139                 return NULL;
 140         sm->peap_done = FALSE;
 141         data->peap_version = EAP_PEAP_VERSION;
 142         data->force_peap_version = -1;
 143         data->peap_outer_success = 2;
 144         data->crypto_binding = OPTIONAL_BINDING;
 145
 146         if (config && config->phase1)
 147                 eap_peap_parse_phase1(data, config->phase1);
 148
 149         if (eap_peer_select_phase2_methods(config, "auth=",
 150                                            &data->phase2_types,
 151                                            &data->num_phase2_types) < 0) {
 152                 eap_peap_deinit(sm, data);
 153                 return NULL;
 154         }
 155
 156         data->phase2_type.vendor = EAP_VENDOR_IETF;
 157         data->phase2_type.method = EAP_TYPE_NONE;
 158
 159         if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_PEAP)) {
 160                 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
 161                 eap_peap_deinit(sm, data);
 162                 return NULL;
 163         }
 164
 165         return data;
 166 }
 167
 168
 169 static void eap_peap_free_key(struct eap_peap_data *data)
 170 {
 171         if (data->key_data) {
 172                 bin_clear_free(data->key_data, EAP_TLS_KEY_LEN);
 173                 data->key_data = NULL;
 174         }
 175 }
 176
 177
 178 static void eap_peap_deinit(struct eap_sm *sm, void *priv)
 179 {
 180         struct eap_peap_data *data = priv;
 181         if (data == NULL)
 182                 return;
 183         if (data->phase2_priv && data->phase2_method)
 184                 data->phase2_method->deinit(sm, data->phase2_priv);
 185         os_free(data->phase2_types);
 186         eap_peer_tls_ssl_deinit(sm, &data->ssl);
 187         eap_peap_free_key(data);
 188         os_free(data->session_id);
 189         wpabuf_free(data->pending_phase2_req);
 190         wpabuf_free(data->pending_resp);
 191         os_free(data);
 192 }
 193
 194
 195 /**
 196  * eap_tlv_build_nak - Build EAP-TLV NAK message
 197  * @id: EAP identifier for the header
 198  * @nak_type: TLV type (EAP_TLV_*)
 199  * Returns: Buffer to the allocated EAP-TLV NAK message or %NULL on failure
 200  *
 201  * This function builds an EAP-TLV NAK message. The caller is responsible for
 202  * freeing the returned buffer.
 203  */
 204 static struct wpabuf * eap_tlv_build_nak(int id, u16 nak_type)
 205 {
 206         struct wpabuf *msg;
 207
 208         msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, 10,
 209                             EAP_CODE_RESPONSE, id);
 210         if (msg == NULL)
 211                 return NULL;
 212
 213         wpabuf_put_u8(msg, 0x80); /* Mandatory */
 214         wpabuf_put_u8(msg, EAP_TLV_NAK_TLV);
 215         wpabuf_put_be16(msg, 6); /* Length */
 216         wpabuf_put_be32(msg, 0); /* Vendor-Id */
 217         wpabuf_put_be16(msg, nak_type); /* NAK-Type */
 218
 219         return msg;
 220 }
 221
 222
 223 static int eap_peap_get_isk(struct eap_sm *sm, struct eap_peap_data *data,
 224                             u8 *isk, size_t isk_len)
 225 {
 226         u8 *key;
 227         size_t key_len;
 228
 229         os_memset(isk, 0, isk_len);
 230         if (data->phase2_method == NULL || data->phase2_priv == NULL ||
 231             data->phase2_method->isKeyAvailable == NULL ||
 232             data->phase2_method->getKey == NULL)
 233                 return 0;
 234
 235         if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
 236             (key = data->phase2_method->getKey(sm, data->phase2_priv,
 237                                                &key_len)) == NULL) {
 238                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not get key material "
 239                            "from Phase 2");
 240                 return -1;
 241         }
 242
 243         if (key_len > isk_len)
 244                 key_len = isk_len;
 245         os_memcpy(isk, key, key_len);
 246         os_free(key);
 247
 248         return 0;
 249 }
 250
 251
 252 static int eap_peap_derive_cmk(struct eap_sm *sm, struct eap_peap_data *data)
 253 {
 254         u8 *tk;
 255         u8 isk[32], imck[60];
 256
 257         /*
 258          * Tunnel key (TK) is the first 60 octets of the key generated by
 259          * phase 1 of PEAP (based on TLS).
 260          */
 261         tk = data->key_data;
 262         if (tk == NULL)
 263                 return -1;
 264         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60);
 265
 266         if (data->reauth &&
 267             tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
 268                 /* Fast-connect: IPMK|CMK = TK */
 269                 os_memcpy(data->ipmk, tk, 40);
 270                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK from TK",
 271                                 data->ipmk, 40);
 272                 os_memcpy(data->cmk, tk + 40, 20);
 273                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK from TK",
 274                                 data->cmk, 20);
 275                 return 0;
 276         }
 277
 278         if (eap_peap_get_isk(sm, data, isk, sizeof(isk)) < 0)
 279                 return -1;
 280         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk));
 281
 282         /*
 283          * IPMK Seed = "Inner Methods Compound Keys" | ISK
 284          * TempKey = First 40 octets of TK
 285          * IPMK|CMK = PRF+(TempKey, IPMK Seed, 60)
 286          * (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space
 287          * in the end of the label just before ISK; is that just a typo?)
 288          */
 289         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40);
 290         if (peap_prfplus(data->peap_version, tk, 40,
 291                          "Inner Methods Compound Keys",
 292                          isk, sizeof(isk), imck, sizeof(imck)) < 0)
 293                 return -1;
 294         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
 295                         imck, sizeof(imck));
 296
 297         os_memcpy(data->ipmk, imck, 40);
 298         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
 299         os_memcpy(data->cmk, imck + 40, 20);
 300         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);
 301
 302         return 0;
 303 }
 304
 305
 306 static int eap_tlv_add_cryptobinding(struct eap_sm *sm,
 307                                      struct eap_peap_data *data,
 308                                      struct wpabuf *buf)
 309 {
 310         u8 *mac;
 311         u8 eap_type = EAP_TYPE_PEAP;
 312         const u8 *addr[2];
 313         size_t len[2];
 314         u16 tlv_type;
 315
 316         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
 317         addr[0] = wpabuf_put(buf, 0);
 318         len[0] = 60;
 319         addr[1] = &eap_type;
 320         len[1] = 1;
 321
 322         tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
 323         wpabuf_put_be16(buf, tlv_type);
 324         wpabuf_put_be16(buf, 56);
 325
 326         wpabuf_put_u8(buf, 0); /* Reserved */
 327         wpabuf_put_u8(buf, data->peap_version); /* Version */
 328         wpabuf_put_u8(buf, data->peap_version); /* RecvVersion */
 329         wpabuf_put_u8(buf, 1); /* SubType: 0 = Request, 1 = Response */
 330         wpabuf_put_data(buf, data->binding_nonce, 32); /* Nonce */
 331         mac = wpabuf_put(buf, 20); /* Compound_MAC */
 332         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK", data->cmk, 20);
 333         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
 334                     addr[0], len[0]);
 335         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
 336                     addr[1], len[1]);
 337         hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac);
 338         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC", mac, SHA1_MAC_LEN);
 339         data->crypto_binding_used = 1;
 340
 341         return 0;
 342 }
 343
 344
 345 /**
 346  * eap_tlv_build_result - Build EAP-TLV Result message
 347  * @id: EAP identifier for the header
 348  * @status: Status (EAP_TLV_RESULT_SUCCESS or EAP_TLV_RESULT_FAILURE)
 349  * Returns: Buffer to the allocated EAP-TLV Result message or %NULL on failure
 350  *
 351  * This function builds an EAP-TLV Result message. The caller is responsible
 352  * for freeing the returned buffer.
 353  */
 354 static struct wpabuf * eap_tlv_build_result(struct eap_sm *sm,
 355                                             struct eap_peap_data *data,
 356                                             int crypto_tlv_used,
 357                                             int id, u16 status)
 358 {
 359         struct wpabuf *msg;
 360         size_t len;
 361
 362         if (data->crypto_binding == NO_BINDING)
 363                 crypto_tlv_used = 0;
 364
 365         len = 6;
 366         if (crypto_tlv_used)
 367                 len += 60; /* Cryptobinding TLV */
 368         msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len,
 369                             EAP_CODE_RESPONSE, id);
 370         if (msg == NULL)
 371                 return NULL;
 372
 373         wpabuf_put_u8(msg, 0x80); /* Mandatory */
 374         wpabuf_put_u8(msg, EAP_TLV_RESULT_TLV);
 375         wpabuf_put_be16(msg, 2); /* Length */
 376         wpabuf_put_be16(msg, status); /* Status */
 377
 378         if (crypto_tlv_used && eap_tlv_add_cryptobinding(sm, data, msg)) {
 379                 wpabuf_free(msg);
 380                 return NULL;
 381         }
 382
 383         return msg;
 384 }
 385
 386
 387 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
 388                                           struct eap_peap_data *data,
 389                                           const u8 *crypto_tlv,
 390                                           size_t crypto_tlv_len)
 391 {
 392         u8 buf[61], mac[SHA1_MAC_LEN];
 393         const u8 *pos;
 394
 395         if (eap_peap_derive_cmk(sm, data) < 0) {
 396                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not derive CMK");
 397                 return -1;
 398         }
 399
 400         if (crypto_tlv_len != 4 + 56) {
 401                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
 402                            "length %d", (int) crypto_tlv_len);
 403                 return -1;
 404         }
 405
 406         pos = crypto_tlv;
 407         pos += 4; /* TLV header */
 408         if (pos[1] != data->peap_version) {
 409                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
 410                            "mismatch (was %d; expected %d)",
 411                            pos[1], data->peap_version);
 412                 return -1;
 413         }
 414
 415         if (pos[3] != 0) {
 416                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
 417                            "SubType %d", pos[3]);
 418                 return -1;
 419         }
 420         pos += 4;
 421         os_memcpy(data->binding_nonce, pos, 32);
 422         pos += 32; /* Nonce */
 423
 424         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
 425         os_memcpy(buf, crypto_tlv, 60);
 426         os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
 427         buf[60] = EAP_TYPE_PEAP;
 428         wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Compound_MAC data",
 429                     buf, sizeof(buf));
 430         hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
 431
 432         if (os_memcmp_const(mac, pos, SHA1_MAC_LEN) != 0) {
 433                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
 434                            "cryptobinding TLV");
 435                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received MAC",
 436                             pos, SHA1_MAC_LEN);
 437                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Expected MAC",
 438                             mac, SHA1_MAC_LEN);
 439                 return -1;
 440         }
 441
 442         wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
 443
 444         return 0;
 445 }
 446
 447
 448 /**
 449  * eap_tlv_process - Process a received EAP-TLV message and generate a response
 450  * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
 451  * @ret: Return values from EAP request validation and processing
 452  * @req: EAP-TLV request to be processed. The caller must have validated that
 453  * the buffer is large enough to contain full request (hdr->length bytes) and
 454  * that the EAP type is EAP_TYPE_TLV.
 455  * @resp: Buffer to return a pointer to the allocated response message. This
 456  * field should be initialized to %NULL before the call. The value will be
 457  * updated if a response message is generated. The caller is responsible for
 458  * freeing the allocated message.
 459  * @force_failure: Force negotiation to fail
 460  * Returns: 0 on success, -1 on failure
 461  */
 462 static int eap_tlv_process(struct eap_sm *sm, struct eap_peap_data *data,
 463                            struct eap_method_ret *ret,
 464                            const struct wpabuf *req, struct wpabuf **resp,
 465                            int force_failure)
 466 {
 467         size_t left, tlv_len;
 468         const u8 *pos;
 469         const u8 *result_tlv = NULL, *crypto_tlv = NULL;
 470         size_t result_tlv_len = 0, crypto_tlv_len = 0;
 471         int tlv_type, mandatory;
 472
 473         /* Parse TLVs */
 474         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, req, &left);
 475         if (pos == NULL)
 476                 return -1;
 477         wpa_hexdump(MSG_DEBUG, "EAP-TLV: Received TLVs", pos, left);
 478         while (left >= 4) {
 479                 mandatory = !!(pos[0] & 0x80);
 480                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
 481                 pos += 2;
 482                 tlv_len = WPA_GET_BE16(pos);
 483                 pos += 2;
 484                 left -= 4;
 485                 if (tlv_len > left) {
 486                         wpa_printf(MSG_DEBUG, "EAP-TLV: TLV underrun "
 487                                    "(tlv_len=%lu left=%lu)",
 488                                    (unsigned long) tlv_len,
 489                                    (unsigned long) left);
 490                         return -1;
 491                 }
 492                 switch (tlv_type) {
 493                 case EAP_TLV_RESULT_TLV:
 494                         result_tlv = pos;
 495                         result_tlv_len = tlv_len;
 496                         break;
 497                 case EAP_TLV_CRYPTO_BINDING_TLV:
 498                         crypto_tlv = pos;
 499                         crypto_tlv_len = tlv_len;
 500                         break;
 501                 default:
 502                         wpa_printf(MSG_DEBUG, "EAP-TLV: Unsupported TLV Type "
 503                                    "%d%s", tlv_type,
 504                                    mandatory ? " (mandatory)" : "");
 505                         if (mandatory) {
 506                                 /* NAK TLV and ignore all TLVs in this packet.
 507                                  */
 508                                 *resp = eap_tlv_build_nak(eap_get_id(req),
 509                                                           tlv_type);
 510                                 return *resp == NULL ? -1 : 0;
 511                         }
 512                         /* Ignore this TLV, but process other TLVs */
 513                         break;
 514                 }
 515
 516                 pos += tlv_len;
 517                 left -= tlv_len;
 518         }
 519         if (left) {
 520                 wpa_printf(MSG_DEBUG, "EAP-TLV: Last TLV too short in "
 521                            "Request (left=%lu)", (unsigned long) left);
 522                 return -1;
 523         }
 524
 525         /* Process supported TLVs */
 526         if (crypto_tlv && data->crypto_binding != NO_BINDING) {
 527                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
 528                             crypto_tlv, crypto_tlv_len);
 529                 if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
 530                                                    crypto_tlv_len + 4) < 0) {
 531                         if (result_tlv == NULL)
 532                                 return -1;
 533                         force_failure = 1;
 534                         crypto_tlv = NULL; /* do not include Cryptobinding TLV
 535                                             * in response, if the received
 536                                             * cryptobinding was invalid. */
 537                 }
 538         } else if (!crypto_tlv && data->crypto_binding == REQUIRE_BINDING) {
 539                 wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
 540                 return -1;
 541         }
 542
 543         if (result_tlv) {
 544                 int status, resp_status;
 545                 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Result TLV",
 546                             result_tlv, result_tlv_len);
 547                 if (result_tlv_len < 2) {
 548                         wpa_printf(MSG_INFO, "EAP-TLV: Too short Result TLV "
 549                                    "(len=%lu)",
 550                                    (unsigned long) result_tlv_len);
 551                         return -1;
 552                 }
 553                 status = WPA_GET_BE16(result_tlv);
 554                 if (status == EAP_TLV_RESULT_SUCCESS) {
 555                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Success "
 556                                    "- EAP-TLV/Phase2 Completed");
 557                         if (force_failure) {
 558                                 wpa_printf(MSG_INFO, "EAP-TLV: Earlier failure"
 559                                            " - force failed Phase 2");
 560                                 resp_status = EAP_TLV_RESULT_FAILURE;
 561                                 ret->decision = DECISION_FAIL;
 562                         } else {
 563                                 resp_status = EAP_TLV_RESULT_SUCCESS;
 564                                 ret->decision = DECISION_UNCOND_SUCC;
 565                         }
 566                 } else if (status == EAP_TLV_RESULT_FAILURE) {
 567                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Failure");
 568                         resp_status = EAP_TLV_RESULT_FAILURE;
 569                         ret->decision = DECISION_FAIL;
 570                 } else {
 571                         wpa_printf(MSG_INFO, "EAP-TLV: Unknown TLV Result "
 572                                    "Status %d", status);
 573                         resp_status = EAP_TLV_RESULT_FAILURE;
 574                         ret->decision = DECISION_FAIL;
 575                 }
 576                 ret->methodState = METHOD_DONE;
 577
 578                 *resp = eap_tlv_build_result(sm, data, crypto_tlv != NULL,
 579                                              eap_get_id(req), resp_status);
 580         }
 581
 582         return 0;
 583 }
 584
 585
 586 static int eap_peap_phase2_request(struct eap_sm *sm,
 587                                    struct eap_peap_data *data,
 588                                    struct eap_method_ret *ret,
 589                                    struct wpabuf *req,
 590                                    struct wpabuf **resp)
 591 {
 592         struct eap_hdr *hdr = wpabuf_mhead(req);
 593         size_t len = be_to_host16(hdr->length);
 594         u8 *pos;
 595         struct eap_method_ret iret;
 596         struct eap_peer_config *config = eap_get_config(sm);
 597
 598         if (len <= sizeof(struct eap_hdr)) {
 599                 wpa_printf(MSG_INFO, "EAP-PEAP: too short "
 600                            "Phase 2 request (len=%lu)", (unsigned long) len);
 601                 return -1;
 602         }
 603         pos = (u8 *) (hdr + 1);
 604         wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Request: type=%d", *pos);
 605         switch (*pos) {
 606         case EAP_TYPE_IDENTITY:
 607                 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
 608                 break;
 609         case EAP_TYPE_TLV:
 610                 os_memset(&iret, 0, sizeof(iret));
 611                 if (eap_tlv_process(sm, data, &iret, req, resp,
 612                                     data->phase2_eap_started &&
 613                                     !data->phase2_eap_success)) {
 614                         ret->methodState = METHOD_DONE;
 615                         ret->decision = DECISION_FAIL;
 616                         return -1;
 617                 }
 618                 if (iret.methodState == METHOD_DONE ||
 619                     iret.methodState == METHOD_MAY_CONT) {
 620                         ret->methodState = iret.methodState;
 621                         ret->decision = iret.decision;
 622                         data->phase2_success = 1;
 623                 }
 624                 break;
 625         case EAP_TYPE_EXPANDED:
 626 #ifdef EAP_TNC
 627                 if (data->soh) {
 628                         const u8 *epos;
 629                         size_t eleft;
 630
 631                         epos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21,
 632                                                 req, &eleft);
 633                         if (epos) {
 634                                 struct wpabuf *buf;
 635                                 wpa_printf(MSG_DEBUG,
 636                                            "EAP-PEAP: SoH EAP Extensions");
 637                                 buf = tncc_process_soh_request(data->soh,
 638                                                                epos, eleft);
 639                                 if (buf) {
 640                                         *resp = eap_msg_alloc(
 641                                                 EAP_VENDOR_MICROSOFT, 0x21,
 642                                                 wpabuf_len(buf),
 643                                                 EAP_CODE_RESPONSE,
 644                                                 hdr->identifier);
 645                                         if (*resp == NULL) {
 646                                                 ret->methodState = METHOD_DONE;
 647                                                 ret->decision = DECISION_FAIL;
 648                                                 return -1;
 649                                         }
 650                                         wpabuf_put_buf(*resp, buf);
 651                                         wpabuf_free(buf);
 652                                         break;
 653                                 }
 654                         }
 655                 }
 656 #endif /* EAP_TNC */
 657                 /* fall through */
 658         default:
 659                 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
 660                     data->phase2_type.method == EAP_TYPE_NONE) {
 661                         size_t i;
 662                         for (i = 0; i < data->num_phase2_types; i++) {
 663                                 if (data->phase2_types[i].vendor !=
 664                                     EAP_VENDOR_IETF ||
 665                                     data->phase2_types[i].method != *pos)
 666                                         continue;
 667
 668                                 data->phase2_type.vendor =
 669                                         data->phase2_types[i].vendor;
 670                                 data->phase2_type.method =
 671                                         data->phase2_types[i].method;
 672                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Selected "
 673                                            "Phase 2 EAP vendor %d method %d",
 674                                            data->phase2_type.vendor,
 675                                            data->phase2_type.method);
 676                                 break;
 677                         }
 678                 }
 679                 if (*pos != data->phase2_type.method ||
 680                     *pos == EAP_TYPE_NONE) {
 681                         if (eap_peer_tls_phase2_nak(data->phase2_types,
 682                                                     data->num_phase2_types,
 683                                                     hdr, resp))
 684                                 return -1;
 685                         return 0;
 686                 }
 687
 688                 if (data->phase2_priv == NULL) {
 689                         data->phase2_method = eap_peer_get_eap_method(
 690                                 data->phase2_type.vendor,
 691                                 data->phase2_type.method);
 692                         if (data->phase2_method) {
 693                                 sm->init_phase2 = 1;
 694                                 data->phase2_priv =
 695                                         data->phase2_method->init(sm);
 696                                 sm->init_phase2 = 0;
 697                         }
 698                 }
 699                 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
 700                         wpa_printf(MSG_INFO, "EAP-PEAP: failed to initialize "
 701                                    "Phase 2 EAP method %d", *pos);
 702                         ret->methodState = METHOD_DONE;
 703                         ret->decision = DECISION_FAIL;
 704                         return -1;
 705                 }
 706                 data->phase2_eap_started = 1;
 707                 os_memset(&iret, 0, sizeof(iret));
 708                 *resp = data->phase2_method->process(sm, data->phase2_priv,
 709                                                      &iret, req);
 710                 if ((iret.methodState == METHOD_DONE ||
 711                      iret.methodState == METHOD_MAY_CONT) &&
 712                     (iret.decision == DECISION_UNCOND_SUCC ||
 713                      iret.decision == DECISION_COND_SUCC)) {
 714                         data->phase2_eap_success = 1;
 715                         data->phase2_success = 1;
 716                 }
 717                 break;
 718         }
 719
 720         if (*resp == NULL &&
 721             (config->pending_req_identity || config->pending_req_password ||
 722              config->pending_req_otp || config->pending_req_new_password)) {
 723                 wpabuf_free(data->pending_phase2_req);
 724                 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
 725         }
 726
 727         return 0;
 728 }
 729
 730
 731 static int eap_peap_decrypt(struct eap_sm *sm, struct eap_peap_data *data,
 732                             struct eap_method_ret *ret,
 733                             const struct eap_hdr *req,
 734                             const struct wpabuf *in_data,
 735                             struct wpabuf **out_data)
 736 {
 737         struct wpabuf *in_decrypted = NULL;
 738         int res, skip_change = 0;
 739         struct eap_hdr *hdr, *rhdr;
 740         struct wpabuf *resp = NULL;
 741         size_t len;
 742
 743         wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
 744                    " Phase 2", (unsigned long) wpabuf_len(in_data));
 745
 746         if (data->pending_phase2_req) {
 747                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 request - "
 748                            "skip decryption and use old data");
 749                 /* Clear TLS reassembly state. */
 750                 eap_peer_tls_reset_input(&data->ssl);
 751                 in_decrypted = data->pending_phase2_req;
 752                 data->pending_phase2_req = NULL;
 753                 skip_change = 1;
 754                 goto continue_req;
 755         }
 756
 757         if (wpabuf_len(in_data) == 0 && sm->workaround &&
 758             data->phase2_success) {
 759                 /*
 760                  * Cisco ACS seems to be using TLS ACK to terminate
 761                  * EAP-PEAPv0/GTC. Try to reply with TLS ACK.
 762                  */
 763                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Received TLS ACK, but "
 764                            "expected data - acknowledge with TLS ACK since "
 765                            "Phase 2 has been completed");
 766                 ret->decision = DECISION_COND_SUCC;
 767                 ret->methodState = METHOD_DONE;
 768                 return 1;
 769         } else if (wpabuf_len(in_data) == 0) {
 770                 /* Received TLS ACK - requesting more fragments */
 771                 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
 772                                             data->peap_version,
 773                                             req->identifier, NULL, out_data);
 774         }
 775
 776         res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
 777         if (res)
 778                 return res;
 779
 780 continue_req:
 781         wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
 782                         in_decrypted);
 783
 784         hdr = wpabuf_mhead(in_decrypted);
 785         if (wpabuf_len(in_decrypted) == 5 && hdr->code == EAP_CODE_REQUEST &&
 786             be_to_host16(hdr->length) == 5 &&
 787             eap_get_type(in_decrypted) == EAP_TYPE_IDENTITY) {
 788                 /* At least FreeRADIUS seems to send full EAP header with
 789                  * EAP Request Identity */
 790                 skip_change = 1;
 791         }
 792         if (wpabuf_len(in_decrypted) >= 5 && hdr->code == EAP_CODE_REQUEST &&
 793             eap_get_type(in_decrypted) == EAP_TYPE_TLV) {
 794                 skip_change = 1;
 795         }
 796
 797         if (data->peap_version == 0 && !skip_change) {
 798                 struct eap_hdr *nhdr;
 799                 struct wpabuf *nmsg = wpabuf_alloc(sizeof(struct eap_hdr) +
 800                                                    wpabuf_len(in_decrypted));
 801                 if (nmsg == NULL) {
 802                         wpabuf_free(in_decrypted);
 803                         return 0;
 804                 }
 805                 nhdr = wpabuf_put(nmsg, sizeof(*nhdr));
 806                 wpabuf_put_buf(nmsg, in_decrypted);
 807                 nhdr->code = req->code;
 808                 nhdr->identifier = req->identifier;
 809                 nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
 810                                             wpabuf_len(in_decrypted));
 811
 812                 wpabuf_free(in_decrypted);
 813                 in_decrypted = nmsg;
 814         }
 815
 816         hdr = wpabuf_mhead(in_decrypted);
 817         if (wpabuf_len(in_decrypted) < sizeof(*hdr)) {
 818                 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
 819                            "EAP frame (len=%lu)",
 820                            (unsigned long) wpabuf_len(in_decrypted));
 821                 wpabuf_free(in_decrypted);
 822                 return 0;
 823         }
 824         len = be_to_host16(hdr->length);
 825         if (len > wpabuf_len(in_decrypted)) {
 826                 wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
 827                            "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
 828                            (unsigned long) wpabuf_len(in_decrypted),
 829                            (unsigned long) len);
 830                 wpabuf_free(in_decrypted);
 831                 return 0;
 832         }
 833         if (len < wpabuf_len(in_decrypted)) {
 834                 wpa_printf(MSG_INFO, "EAP-PEAP: Odd.. Phase 2 EAP header has "
 835                            "shorter length than full decrypted data "
 836                            "(%lu < %lu)",
 837                            (unsigned long) len,
 838                            (unsigned long) wpabuf_len(in_decrypted));
 839         }
 840         wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
 841                    "identifier=%d length=%lu", hdr->code, hdr->identifier,
 842                    (unsigned long) len);
 843         switch (hdr->code) {
 844         case EAP_CODE_REQUEST:
 845                 if (eap_peap_phase2_request(sm, data, ret, in_decrypted,
 846                                             &resp)) {
 847                         wpabuf_free(in_decrypted);
 848                         wpa_printf(MSG_INFO, "EAP-PEAP: Phase2 Request "
 849                                    "processing failed");
 850                         return 0;
 851                 }
 852                 break;
 853         case EAP_CODE_SUCCESS:
 854                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
 855                 if (data->peap_version == 1) {
 856                         /* EAP-Success within TLS tunnel is used to indicate
 857                          * shutdown of the TLS channel. The authentication has
 858                          * been completed. */
 859                         if (data->phase2_eap_started &&
 860                             !data->phase2_eap_success) {
 861                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 "
 862                                            "Success used to indicate success, "
 863                                            "but Phase 2 EAP was not yet "
 864                                            "completed successfully");
 865                                 ret->methodState = METHOD_DONE;
 866                                 ret->decision = DECISION_FAIL;
 867                                 wpabuf_free(in_decrypted);
 868                                 return 0;
 869                         }
 870                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - "
 871                                    "EAP-Success within TLS tunnel - "
 872                                    "authentication completed");
 873                         ret->decision = DECISION_UNCOND_SUCC;
 874                         ret->methodState = METHOD_DONE;
 875                         data->phase2_success = 1;
 876                         if (data->peap_outer_success == 2) {
 877                                 wpabuf_free(in_decrypted);
 878                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK "
 879                                            "to finish authentication");
 880                                 return 1;
 881                         } else if (data->peap_outer_success == 1) {
 882                                 /* Reply with EAP-Success within the TLS
 883                                  * channel to complete the authentication. */
 884                                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
 885                                 if (resp) {
 886                                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
 887                                         rhdr->code = EAP_CODE_SUCCESS;
 888                                         rhdr->identifier = hdr->identifier;
 889                                         rhdr->length =
 890                                                 host_to_be16(sizeof(*rhdr));
 891                                 }
 892                         } else {
 893                                 /* No EAP-Success expected for Phase 1 (outer,
 894                                  * unencrypted auth), so force EAP state
 895                                  * machine to SUCCESS state. */
 896                                 sm->peap_done = TRUE;
 897                         }
 898                 } else {
 899                         /* FIX: ? */
 900                 }
 901                 break;
 902         case EAP_CODE_FAILURE:
 903                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
 904                 ret->decision = DECISION_FAIL;
 905                 ret->methodState = METHOD_MAY_CONT;
 906                 ret->allowNotifications = FALSE;
 907                 /* Reply with EAP-Failure within the TLS channel to complete
 908                  * failure reporting. */
 909                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
 910                 if (resp) {
 911                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
 912                         rhdr->code = EAP_CODE_FAILURE;
 913                         rhdr->identifier = hdr->identifier;
 914                         rhdr->length = host_to_be16(sizeof(*rhdr));
 915                 }
 916                 break;
 917         default:
 918                 wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
 919                            "Phase 2 EAP header", hdr->code);
 920                 break;
 921         }
 922
 923         wpabuf_free(in_decrypted);
 924
 925         if (resp) {
 926                 int skip_change2 = 0;
 927                 struct wpabuf *rmsg, buf;
 928
 929                 wpa_hexdump_buf_key(MSG_DEBUG,
 930                                     "EAP-PEAP: Encrypting Phase 2 data", resp);
 931                 /* PEAP version changes */
 932                 if (wpabuf_len(resp) >= 5 &&
 933                     wpabuf_head_u8(resp)[0] == EAP_CODE_RESPONSE &&
 934                     eap_get_type(resp) == EAP_TYPE_TLV)
 935                         skip_change2 = 1;
 936                 rmsg = resp;
 937                 if (data->peap_version == 0 && !skip_change2) {
 938                         wpabuf_set(&buf, wpabuf_head_u8(resp) +
 939                                    sizeof(struct eap_hdr),
 940                                    wpabuf_len(resp) - sizeof(struct eap_hdr));
 941                         rmsg = &buf;
 942                 }
 943
 944                 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
 945                                          data->peap_version, req->identifier,
 946                                          rmsg, out_data)) {
 947                         wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt "
 948                                    "a Phase 2 frame");
 949                 }
 950                 wpabuf_free(resp);
 951         }
 952
 953         return 0;
 954 }
 955
 956
 957 static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
 958                                         struct eap_method_ret *ret,
 959                                         const struct wpabuf *reqData)
 960 {
 961         const struct eap_hdr *req;
 962         size_t left;
 963         int res;
 964         u8 flags, id;
 965         struct wpabuf *resp;
 966         const u8 *pos;
 967         struct eap_peap_data *data = priv;
 968         struct wpabuf msg;
 969
 970         pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret,
 971                                         reqData, &left, &flags);
 972         if (pos == NULL)
 973                 return NULL;
 974         req = wpabuf_head(reqData);
 975         id = req->identifier;
 976
 977         if (flags & EAP_TLS_FLAGS_START) {
 978                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Start (server ver=%d, own "
 979                            "ver=%d)", flags & EAP_TLS_VERSION_MASK,
 980                         data->peap_version);
 981                 if ((flags & EAP_TLS_VERSION_MASK) < data->peap_version)
 982                         data->peap_version = flags & EAP_TLS_VERSION_MASK;
 983                 if (data->force_peap_version >= 0 &&
 984                     data->force_peap_version != data->peap_version) {
 985                         wpa_printf(MSG_WARNING, "EAP-PEAP: Failed to select "
 986                                    "forced PEAP version %d",
 987                                    data->force_peap_version);
 988                         ret->methodState = METHOD_DONE;
 989                         ret->decision = DECISION_FAIL;
 990                         ret->allowNotifications = FALSE;
 991                         return NULL;
 992                 }
 993                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Using PEAP version %d",
 994                            data->peap_version);
 995                 left = 0; /* make sure that this frame is empty, even though it
 996                            * should always be, anyway */
 997         }
 998
 999         wpabuf_set(&msg, pos, left);
1000
1001         resp = NULL;
1002         if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1003             !data->resuming) {
1004                 res = eap_peap_decrypt(sm, data, ret, req, &msg, &resp);
1005         } else {
1006                 if (sm->waiting_ext_cert_check && data->pending_resp) {
1007                         struct eap_peer_config *config = eap_get_config(sm);
1008
1009                         if (config->pending_ext_cert_check ==
1010                             EXT_CERT_CHECK_GOOD) {
1011                                 wpa_printf(MSG_DEBUG,
1012                                            "EAP-PEAP: External certificate check succeeded - continue handshake");
1013                                 resp = data->pending_resp;
1014                                 data->pending_resp = NULL;
1015                                 sm->waiting_ext_cert_check = 0;
1016                                 return resp;
1017                         }
1018
1019                         if (config->pending_ext_cert_check ==
1020                             EXT_CERT_CHECK_BAD) {
1021                                 wpa_printf(MSG_DEBUG,
1022                                            "EAP-PEAP: External certificate check failed - force authentication failure");
1023                                 ret->methodState = METHOD_DONE;
1024                                 ret->decision = DECISION_FAIL;
1025                                 sm->waiting_ext_cert_check = 0;
1026                                 return NULL;
1027                         }
1028
1029                         wpa_printf(MSG_DEBUG,
1030                                    "EAP-PEAP: Continuing to wait external server certificate validation");
1031                         return NULL;
1032                 }
1033
1034                 res = eap_peer_tls_process_helper(sm, &data->ssl,
1035                                                   EAP_TYPE_PEAP,
1036                                                   data->peap_version, id, &msg,
1037                                                   &resp);
1038
1039                 if (res < 0) {
1040                         wpa_printf(MSG_DEBUG,
1041                                    "EAP-PEAP: TLS processing failed");
1042                         ret->methodState = METHOD_DONE;
1043                         ret->decision = DECISION_FAIL;
1044                         return resp;
1045                 }
1046
1047
1048                 if (sm->waiting_ext_cert_check) {
1049                         wpa_printf(MSG_DEBUG,
1050                                    "EAP-PEAP: Waiting external server certificate validation");
1051                         wpabuf_free(data->pending_resp);
1052                         data->pending_resp = resp;
1053                         return NULL;
1054                 }
1055
1056                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1057                         char *label;
1058                         wpa_printf(MSG_DEBUG,
1059                                    "EAP-PEAP: TLS done, proceed to Phase 2");
1060                         eap_peap_free_key(data);
1061                         /* draft-josefsson-ppext-eap-tls-eap-05.txt
1062                          * specifies that PEAPv1 would use "client PEAP
1063                          * encryption" as the label. However, most existing
1064                          * PEAPv1 implementations seem to be using the old
1065                          * label, "client EAP encryption", instead. Use the old
1066                          * label by default, but allow it to be configured with
1067                          * phase1 parameter peaplabel=1. */
1068                         if (data->force_new_label)
1069                                 label = "client PEAP encryption";
1070                         else
1071                                 label = "client EAP encryption";
1072                         wpa_printf(MSG_DEBUG, "EAP-PEAP: using label '%s' in "
1073                                    "key derivation", label);
1074                         data->key_data =
1075                                 eap_peer_tls_derive_key(sm, &data->ssl, label,
1076                                                         EAP_TLS_KEY_LEN);
1077                         if (data->key_data) {
1078                                 wpa_hexdump_key(MSG_DEBUG,
1079                                                 "EAP-PEAP: Derived key",
1080                                                 data->key_data,
1081                                                 EAP_TLS_KEY_LEN);
1082                         } else {
1083                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to "
1084                                            "derive key");
1085                         }
1086
1087                         os_free(data->session_id);
1088                         data->session_id =
1089                                 eap_peer_tls_derive_session_id(sm, &data->ssl,
1090                                                                EAP_TYPE_PEAP,
1091                                                                &data->id_len);
1092                         if (data->session_id) {
1093                                 wpa_hexdump(MSG_DEBUG,
1094                                             "EAP-PEAP: Derived Session-Id",
1095                                             data->session_id, data->id_len);
1096                         } else {
1097                                 wpa_printf(MSG_ERROR, "EAP-PEAP: Failed to "
1098                                            "derive Session-Id");
1099                         }
1100
1101                         if (sm->workaround && data->resuming) {
1102                                 /*
1103                                  * At least few RADIUS servers (Aegis v1.1.6;
1104                                  * but not v1.1.4; and Cisco ACS) seem to be
1105                                  * terminating PEAPv1 (Aegis) or PEAPv0 (Cisco
1106                                  * ACS) session resumption with outer
1107                                  * EAP-Success. This does not seem to follow
1108                                  * draft-josefsson-pppext-eap-tls-eap-05.txt
1109                                  * section 4.2, so only allow this if EAP
1110                                  * workarounds are enabled.
1111                                  */
1112                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Workaround - "
1113                                            "allow outer EAP-Success to "
1114                                            "terminate PEAP resumption");
1115                                 ret->decision = DECISION_COND_SUCC;
1116                                 data->phase2_success = 1;
1117                         }
1118
1119                         data->resuming = 0;
1120                 }
1121
1122                 if (res == 2) {
1123                         /*
1124                          * Application data included in the handshake message.
1125                          */
1126                         wpabuf_free(data->pending_phase2_req);
1127                         data->pending_phase2_req = resp;
1128                         resp = NULL;
1129                         res = eap_peap_decrypt(sm, data, ret, req, &msg,
1130                                                &resp);
1131                 }
1132         }
1133
1134         if (ret->methodState == METHOD_DONE) {
1135                 ret->allowNotifications = FALSE;
1136         }
1137
1138         if (res == 1) {
1139                 wpabuf_free(resp);
1140                 return eap_peer_tls_build_ack(id, EAP_TYPE_PEAP,
1141                                               data->peap_version);
1142         }
1143
1144         return resp;
1145 }
1146
1147
1148 static Boolean eap_peap_has_reauth_data(struct eap_sm *sm, void *priv)
1149 {
1150         struct eap_peap_data *data = priv;
1151         return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1152                 data->phase2_success;
1153 }
1154
1155
1156 static void eap_peap_deinit_for_reauth(struct eap_sm *sm, void *priv)
1157 {
1158         struct eap_peap_data *data = priv;
1159         wpabuf_free(data->pending_phase2_req);
1160         data->pending_phase2_req = NULL;
1161         wpabuf_free(data->pending_resp);
1162         data->pending_resp = NULL;
1163         data->crypto_binding_used = 0;
1164 }
1165
1166
1167 static void * eap_peap_init_for_reauth(struct eap_sm *sm, void *priv)
1168 {
1169         struct eap_peap_data *data = priv;
1170         eap_peap_free_key(data);
1171         os_free(data->session_id);
1172         data->session_id = NULL;
1173         if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1174                 os_free(data);
1175                 return NULL;
1176         }
1177         if (data->phase2_priv && data->phase2_method &&
1178             data->phase2_method->init_for_reauth)
1179                 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1180         data->phase2_success = 0;
1181         data->phase2_eap_success = 0;
1182         data->phase2_eap_started = 0;
1183         data->resuming = 1;
1184         data->reauth = 1;
1185         sm->peap_done = FALSE;
1186         return priv;
1187 }
1188
1189
1190 static int eap_peap_get_status(struct eap_sm *sm, void *priv, char *buf,
1191                                size_t buflen, int verbose)
1192 {
1193         struct eap_peap_data *data = priv;
1194         int len, ret;
1195
1196         len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1197         if (data->phase2_method) {
1198                 ret = os_snprintf(buf + len, buflen - len,
1199                                   "EAP-PEAPv%d Phase2 method=%s\n",
1200                                   data->peap_version,
1201                                   data->phase2_method->name);
1202                 if (os_snprintf_error(buflen - len, ret))
1203                         return len;
1204                 len += ret;
1205         }
1206         return len;
1207 }
1208
1209
1210 static Boolean eap_peap_isKeyAvailable(struct eap_sm *sm, void *priv)
1211 {
1212         struct eap_peap_data *data = priv;
1213         return data->key_data != NULL && data->phase2_success;
1214 }
1215
1216
1217 static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
1218 {
1219         struct eap_peap_data *data = priv;
1220         u8 *key;
1221
1222         if (data->key_data == NULL || !data->phase2_success)
1223                 return NULL;
1224
1225         key = os_malloc(EAP_TLS_KEY_LEN);
1226         if (key == NULL)
1227                 return NULL;
1228
1229         *len = EAP_TLS_KEY_LEN;
1230
1231         if (data->crypto_binding_used) {
1232                 u8 csk[128];
1233                 /*
1234                  * Note: It looks like Microsoft implementation requires null
1235                  * termination for this label while the one used for deriving
1236                  * IPMK|CMK did not use null termination.
1237                  */
1238                 if (peap_prfplus(data->peap_version, data->ipmk, 40,
1239                                  "Session Key Generating Function",
1240                                  (u8 *) "\00", 1, csk, sizeof(csk)) < 0) {
1241                         os_free(key);
1242                         return NULL;
1243                 }
1244                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
1245                 os_memcpy(key, csk, EAP_TLS_KEY_LEN);
1246                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1247                             key, EAP_TLS_KEY_LEN);
1248         } else
1249                 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1250
1251         return key;
1252 }
1253
1254
1255 static u8 * eap_peap_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1256 {
1257         struct eap_peap_data *data = priv;
1258         u8 *id;
1259
1260         if (data->session_id == NULL || !data->phase2_success)
1261                 return NULL;
1262
1263         id = os_malloc(data->id_len);
1264         if (id == NULL)
1265                 return NULL;
1266
1267         *len = data->id_len;
1268         os_memcpy(id, data->session_id, data->id_len);
1269
1270         return id;
1271 }
1272
1273
1274 int eap_peer_peap_register(void)
1275 {
1276         struct eap_method *eap;
1277         int ret;
1278
1279         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1280                                     EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
1281         if (eap == NULL)
1282                 return -1;
1283
1284         eap->init = eap_peap_init;
1285         eap->deinit = eap_peap_deinit;
1286         eap->process = eap_peap_process;
1287         eap->isKeyAvailable = eap_peap_isKeyAvailable;
1288         eap->getKey = eap_peap_getKey;
1289         eap->get_status = eap_peap_get_status;
1290         eap->has_reauth_data = eap_peap_has_reauth_data;
1291         eap->deinit_for_reauth = eap_peap_deinit_for_reauth;
1292         eap->init_for_reauth = eap_peap_init_for_reauth;
1293         eap->getSessionId = eap_peap_get_session_id;
1294
1295         ret = eap_peer_method_register(eap);
1296         if (ret)
1297                 eap_peer_method_free(eap);
1298         return ret;
1299 }