wpa_supplicant_node: wpa_supplicant_node: eap

00001 /*
00002  * EAP peer method: EAP-PEAP (draft-josefsson-pppext-eap-tls-eap-10.txt)
00003  * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
00004  *
00005  * This program is free software; you can redistribute it and/or modify
00006  * it under the terms of the GNU General Public License version 2 as
00007  * published by the Free Software Foundation.
00008  *
00009  * Alternatively, this software may be distributed under the terms of BSD
00010  * license.
00011  *
00012  * See README and COPYING for more details.
00013  */
00014 
00015 #include "includes.h"
00016 
00017 #include "common.h"
00018 #include "crypto/sha1.h"
00019 #include "crypto/tls.h"
00020 #include "eap_common/eap_tlv_common.h"
00021 #include "eap_common/eap_peap_common.h"
00022 #include "eap_i.h"
00023 #include "eap_tls_common.h"
00024 #include "eap_config.h"
00025 #include "tncc.h"
00026 
00027 
00028 /* Maximum supported PEAP version
00029  * 0 = Microsoft's PEAP version 0; draft-kamath-pppext-peapv0-00.txt
00030  * 1 = draft-josefsson-ppext-eap-tls-eap-05.txt
00031  * 2 = draft-josefsson-ppext-eap-tls-eap-10.txt
00032  */
00033 #define EAP_PEAP_VERSION 1
00034 
00035 
00036 static void eap_peap_deinit(struct eap_sm *sm, void *priv);
00037 
00038 
00039 struct eap_peap_data {
00040         struct eap_ssl_data ssl;
00041 
00042         int peap_version, force_peap_version, force_new_label;
00043 
00044         const struct eap_method *phase2_method;
00045         void *phase2_priv;
00046         int phase2_success;
00047         int phase2_eap_success;
00048         int phase2_eap_started;
00049 
00050         struct eap_method_type phase2_type;
00051         struct eap_method_type *phase2_types;
00052         size_t num_phase2_types;
00053 
00054         int peap_outer_success; /* 0 = PEAP terminated on Phase 2 inner
00055                                  * EAP-Success
00056                                  * 1 = reply with tunneled EAP-Success to inner
00057                                  * EAP-Success and expect AS to send outer
00058                                  * (unencrypted) EAP-Success after this
00059                                  * 2 = reply with PEAP/TLS ACK to inner
00060                                  * EAP-Success and expect AS to send outer
00061                                  * (unencrypted) EAP-Success after this */
00062         int resuming; /* starting a resumed session */
00063         int reauth; /* reauthentication */
00064         u8 *key_data;
00065 
00066         struct wpabuf *pending_phase2_req;
00067         enum { NO_BINDING, OPTIONAL_BINDING, REQUIRE_BINDING } crypto_binding;
00068         int crypto_binding_used;
00069         u8 binding_nonce[32];
00070         u8 ipmk[40];
00071         u8 cmk[20];
00072         int soh; /* Whether IF-TNCCS-SOH (Statement of Health; Microsoft NAP)
00073                   * is enabled. */
00074 };
00075 
00076 
00077 static int eap_peap_parse_phase1(struct eap_peap_data *data,
00078                                  const char *phase1)
00079 {
00080         const char *pos;
00081 
00082         pos = os_strstr(phase1, "peapver=");
00083         if (pos) {
00084                 data->force_peap_version = atoi(pos + 8);
00085                 data->peap_version = data->force_peap_version;
00086                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Forced PEAP version %d",
00087                            data->force_peap_version);
00088         }
00089 
00090         if (os_strstr(phase1, "peaplabel=1")) {
00091                 data->force_new_label = 1;
00092                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Force new label for key "
00093                            "derivation");
00094         }
00095 
00096         if (os_strstr(phase1, "peap_outer_success=0")) {
00097                 data->peap_outer_success = 0;
00098                 wpa_printf(MSG_DEBUG, "EAP-PEAP: terminate authentication on "
00099                            "tunneled EAP-Success");
00100         } else if (os_strstr(phase1, "peap_outer_success=1")) {
00101                 data->peap_outer_success = 1;
00102                 wpa_printf(MSG_DEBUG, "EAP-PEAP: send tunneled EAP-Success "
00103                            "after receiving tunneled EAP-Success");
00104         } else if (os_strstr(phase1, "peap_outer_success=2")) {
00105                 data->peap_outer_success = 2;
00106                 wpa_printf(MSG_DEBUG, "EAP-PEAP: send PEAP/TLS ACK after "
00107                            "receiving tunneled EAP-Success");
00108         }
00109 
00110         if (os_strstr(phase1, "crypto_binding=0")) {
00111                 data->crypto_binding = NO_BINDING;
00112                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Do not use cryptobinding");
00113         } else if (os_strstr(phase1, "crypto_binding=1")) {
00114                 data->crypto_binding = OPTIONAL_BINDING;
00115                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Optional cryptobinding");
00116         } else if (os_strstr(phase1, "crypto_binding=2")) {
00117                 data->crypto_binding = REQUIRE_BINDING;
00118                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Require cryptobinding");
00119         }
00120 
00121 #ifdef EAP_TNC
00122         if (os_strstr(phase1, "tnc=soh2")) {
00123                 data->soh = 2;
00124                 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
00125         } else if (os_strstr(phase1, "tnc=soh1")) {
00126                 data->soh = 1;
00127                 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 1 enabled");
00128         } else if (os_strstr(phase1, "tnc=soh")) {
00129                 data->soh = 2;
00130                 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
00131         }
00132 #endif /* EAP_TNC */
00133 
00134         return 0;
00135 }
00136 
00137 
00138 static void * eap_peap_init(struct eap_sm *sm)
00139 {
00140         struct eap_peap_data *data;
00141         struct eap_peer_config *config = eap_get_config(sm);
00142 
00143         data = os_zalloc(sizeof(*data));
00144         if (data == NULL)
00145                 return NULL;
00146         sm->peap_done = FALSE;
00147         data->peap_version = EAP_PEAP_VERSION;
00148         data->force_peap_version = -1;
00149         data->peap_outer_success = 2;
00150         data->crypto_binding = OPTIONAL_BINDING;
00151 
00152         if (config && config->phase1 &&
00153             eap_peap_parse_phase1(data, config->phase1) < 0) {
00154                 eap_peap_deinit(sm, data);
00155                 return NULL;
00156         }
00157 
00158         if (eap_peer_select_phase2_methods(config, "auth=",
00159                                            &data->phase2_types,
00160                                            &data->num_phase2_types) < 0) {
00161                 eap_peap_deinit(sm, data);
00162                 return NULL;
00163         }
00164 
00165         data->phase2_type.vendor = EAP_VENDOR_IETF;
00166         data->phase2_type.method = EAP_TYPE_NONE;
00167 
00168         if (eap_peer_tls_ssl_init(sm, &data->ssl, config)) {
00169                 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
00170                 eap_peap_deinit(sm, data);
00171                 return NULL;
00172         }
00173 
00174         return data;
00175 }
00176 
00177 
00178 static void eap_peap_deinit(struct eap_sm *sm, void *priv)
00179 {
00180         struct eap_peap_data *data = priv;
00181         if (data == NULL)
00182                 return;
00183         if (data->phase2_priv && data->phase2_method)
00184                 data->phase2_method->deinit(sm, data->phase2_priv);
00185         os_free(data->phase2_types);
00186         eap_peer_tls_ssl_deinit(sm, &data->ssl);
00187         os_free(data->key_data);
00188         wpabuf_free(data->pending_phase2_req);
00189         os_free(data);
00190 }
00191 
00192 
00202 static struct wpabuf * eap_tlv_build_nak(int id, u16 nak_type)
00203 {
00204         struct wpabuf *msg;
00205 
00206         msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, 10,
00207                             EAP_CODE_RESPONSE, id);
00208         if (msg == NULL)
00209                 return NULL;
00210 
00211         wpabuf_put_u8(msg, 0x80); /* Mandatory */
00212         wpabuf_put_u8(msg, EAP_TLV_NAK_TLV);
00213         wpabuf_put_be16(msg, 6); /* Length */
00214         wpabuf_put_be32(msg, 0); /* Vendor-Id */
00215         wpabuf_put_be16(msg, nak_type); /* NAK-Type */
00216 
00217         return msg;
00218 }
00219 
00220 
00221 static int eap_peap_get_isk(struct eap_sm *sm, struct eap_peap_data *data,
00222                             u8 *isk, size_t isk_len)
00223 {
00224         u8 *key;
00225         size_t key_len;
00226 
00227         os_memset(isk, 0, isk_len);
00228         if (data->phase2_method == NULL || data->phase2_priv == NULL ||
00229             data->phase2_method->isKeyAvailable == NULL ||
00230             data->phase2_method->getKey == NULL)
00231                 return 0;
00232 
00233         if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
00234             (key = data->phase2_method->getKey(sm, data->phase2_priv,
00235                                                &key_len)) == NULL) {
00236                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not get key material "
00237                            "from Phase 2");
00238                 return -1;
00239         }
00240 
00241         if (key_len > isk_len)
00242                 key_len = isk_len;
00243         os_memcpy(isk, key, key_len);
00244         os_free(key);
00245 
00246         return 0;
00247 }
00248 
00249 
00250 static int eap_peap_derive_cmk(struct eap_sm *sm, struct eap_peap_data *data)
00251 {
00252         u8 *tk;
00253         u8 isk[32], imck[60];
00254 
00255         /*
00256          * Tunnel key (TK) is the first 60 octets of the key generated by
00257          * phase 1 of PEAP (based on TLS).
00258          */
00259         tk = data->key_data;
00260         if (tk == NULL)
00261                 return -1;
00262         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60);
00263 
00264         if (data->reauth &&
00265             tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
00266                 /* Fast-connect: IPMK|CMK = TK */
00267                 os_memcpy(data->ipmk, tk, 40);
00268                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK from TK",
00269                                 data->ipmk, 40);
00270                 os_memcpy(data->cmk, tk + 40, 20);
00271                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK from TK",
00272                                 data->cmk, 20);
00273                 return 0;
00274         }
00275 
00276         if (eap_peap_get_isk(sm, data, isk, sizeof(isk)) < 0)
00277                 return -1;
00278         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk));
00279 
00280         /*
00281          * IPMK Seed = "Inner Methods Compound Keys" | ISK
00282          * TempKey = First 40 octets of TK
00283          * IPMK|CMK = PRF+(TempKey, IPMK Seed, 60)
00284          * (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space
00285          * in the end of the label just before ISK; is that just a typo?)
00286          */
00287         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40);
00288         peap_prfplus(data->peap_version, tk, 40, "Inner Methods Compound Keys",
00289                      isk, sizeof(isk), imck, sizeof(imck));
00290         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
00291                         imck, sizeof(imck));
00292 
00293         os_memcpy(data->ipmk, imck, 40);
00294         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
00295         os_memcpy(data->cmk, imck + 40, 20);
00296         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);
00297 
00298         return 0;
00299 }
00300 
00301 
00302 static int eap_tlv_add_cryptobinding(struct eap_sm *sm,
00303                                      struct eap_peap_data *data,
00304                                      struct wpabuf *buf)
00305 {
00306         u8 *mac;
00307         u8 eap_type = EAP_TYPE_PEAP;
00308         const u8 *addr[2];
00309         size_t len[2];
00310         u16 tlv_type;
00311 
00312         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
00313         addr[0] = wpabuf_put(buf, 0);
00314         len[0] = 60;
00315         addr[1] = &eap_type;
00316         len[1] = 1;
00317 
00318         tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
00319         if (data->peap_version >= 2)
00320                 tlv_type |= EAP_TLV_TYPE_MANDATORY;
00321         wpabuf_put_be16(buf, tlv_type);
00322         wpabuf_put_be16(buf, 56);
00323 
00324         wpabuf_put_u8(buf, 0); /* Reserved */
00325         wpabuf_put_u8(buf, data->peap_version); /* Version */
00326         wpabuf_put_u8(buf, data->peap_version); /* RecvVersion */
00327         wpabuf_put_u8(buf, 1); /* SubType: 0 = Request, 1 = Response */
00328         wpabuf_put_data(buf, data->binding_nonce, 32); /* Nonce */
00329         mac = wpabuf_put(buf, 20); /* Compound_MAC */
00330         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK", data->cmk, 20);
00331         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
00332                     addr[0], len[0]);
00333         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
00334                     addr[1], len[1]);
00335         hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac);
00336         wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC", mac, SHA1_MAC_LEN);
00337         data->crypto_binding_used = 1;
00338 
00339         return 0;
00340 }
00341 
00342 
00352 static struct wpabuf * eap_tlv_build_result(struct eap_sm *sm,
00353                                             struct eap_peap_data *data,
00354                                             int crypto_tlv_used,
00355                                             int id, u16 status)
00356 {
00357         struct wpabuf *msg;
00358         size_t len;
00359 
00360         if (data->crypto_binding == NO_BINDING)
00361                 crypto_tlv_used = 0;
00362 
00363         len = 6;
00364         if (crypto_tlv_used)
00365                 len += 60; /* Cryptobinding TLV */
00366         msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len,
00367                             EAP_CODE_RESPONSE, id);
00368         if (msg == NULL)
00369                 return NULL;
00370 
00371         wpabuf_put_u8(msg, 0x80); /* Mandatory */
00372         wpabuf_put_u8(msg, EAP_TLV_RESULT_TLV);
00373         wpabuf_put_be16(msg, 2); /* Length */
00374         wpabuf_put_be16(msg, status); /* Status */
00375 
00376         if (crypto_tlv_used && eap_tlv_add_cryptobinding(sm, data, msg)) {
00377                 wpabuf_free(msg);
00378                 return NULL;
00379         }
00380 
00381         return msg;
00382 }
00383 
00384 
00385 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
00386                                           struct eap_peap_data *data,
00387                                           const u8 *crypto_tlv,
00388                                           size_t crypto_tlv_len)
00389 {
00390         u8 buf[61], mac[SHA1_MAC_LEN];
00391         const u8 *pos;
00392 
00393         if (eap_peap_derive_cmk(sm, data) < 0) {
00394                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not derive CMK");
00395                 return -1;
00396         }
00397 
00398         if (crypto_tlv_len != 4 + 56) {
00399                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
00400                            "length %d", (int) crypto_tlv_len);
00401                 return -1;
00402         }
00403 
00404         pos = crypto_tlv;
00405         pos += 4; /* TLV header */
00406         if (pos[1] != data->peap_version) {
00407                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
00408                            "mismatch (was %d; expected %d)",
00409                            pos[1], data->peap_version);
00410                 return -1;
00411         }
00412 
00413         if (pos[3] != 0) {
00414                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
00415                            "SubType %d", pos[3]);
00416                 return -1;
00417         }
00418         pos += 4;
00419         os_memcpy(data->binding_nonce, pos, 32);
00420         pos += 32; /* Nonce */
00421 
00422         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
00423         os_memcpy(buf, crypto_tlv, 60);
00424         os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
00425         buf[60] = EAP_TYPE_PEAP;
00426         wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Compound_MAC data",
00427                     buf, sizeof(buf));
00428         hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
00429 
00430         if (os_memcmp(mac, pos, SHA1_MAC_LEN) != 0) {
00431                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
00432                            "cryptobinding TLV");
00433                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received MAC",
00434                             pos, SHA1_MAC_LEN);
00435                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Expected MAC",
00436                             mac, SHA1_MAC_LEN);
00437                 return -1;
00438         }
00439 
00440         wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
00441 
00442         return 0;
00443 }
00444 
00445 
00460 static int eap_tlv_process(struct eap_sm *sm, struct eap_peap_data *data,
00461                            struct eap_method_ret *ret,
00462                            const struct wpabuf *req, struct wpabuf **resp,
00463                            int force_failure)
00464 {
00465         size_t left, tlv_len;
00466         const u8 *pos;
00467         const u8 *result_tlv = NULL, *crypto_tlv = NULL;
00468         size_t result_tlv_len = 0, crypto_tlv_len = 0;
00469         int tlv_type, mandatory;
00470 
00471         /* Parse TLVs */
00472         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, req, &left);
00473         if (pos == NULL)
00474                 return -1;
00475         wpa_hexdump(MSG_DEBUG, "EAP-TLV: Received TLVs", pos, left);
00476         while (left >= 4) {
00477                 mandatory = !!(pos[0] & 0x80);
00478                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
00479                 pos += 2;
00480                 tlv_len = WPA_GET_BE16(pos);
00481                 pos += 2;
00482                 left -= 4;
00483                 if (tlv_len > left) {
00484                         wpa_printf(MSG_DEBUG, "EAP-TLV: TLV underrun "
00485                                    "(tlv_len=%lu left=%lu)",
00486                                    (unsigned long) tlv_len,
00487                                    (unsigned long) left);
00488                         return -1;
00489                 }
00490                 switch (tlv_type) {
00491                 case EAP_TLV_RESULT_TLV:
00492                         result_tlv = pos;
00493                         result_tlv_len = tlv_len;
00494                         break;
00495                 case EAP_TLV_CRYPTO_BINDING_TLV:
00496                         crypto_tlv = pos;
00497                         crypto_tlv_len = tlv_len;
00498                         break;
00499                 default:
00500                         wpa_printf(MSG_DEBUG, "EAP-TLV: Unsupported TLV Type "
00501                                    "%d%s", tlv_type,
00502                                    mandatory ? " (mandatory)" : "");
00503                         if (mandatory) {
00504                                 /* NAK TLV and ignore all TLVs in this packet.
00505                                  */
00506                                 *resp = eap_tlv_build_nak(eap_get_id(req),
00507                                                           tlv_type);
00508                                 return *resp == NULL ? -1 : 0;
00509                         }
00510                         /* Ignore this TLV, but process other TLVs */
00511                         break;
00512                 }
00513 
00514                 pos += tlv_len;
00515                 left -= tlv_len;
00516         }
00517         if (left) {
00518                 wpa_printf(MSG_DEBUG, "EAP-TLV: Last TLV too short in "
00519                            "Request (left=%lu)", (unsigned long) left);
00520                 return -1;
00521         }
00522 
00523         /* Process supported TLVs */
00524         if (crypto_tlv && data->crypto_binding != NO_BINDING) {
00525                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
00526                             crypto_tlv, crypto_tlv_len);
00527                 if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
00528                                                    crypto_tlv_len + 4) < 0) {
00529                         if (result_tlv == NULL)
00530                                 return -1;
00531                         force_failure = 1;
00532                         crypto_tlv = NULL; /* do not include Cryptobinding TLV
00533                                             * in response, if the received
00534                                             * cryptobinding was invalid. */
00535                 }
00536         } else if (!crypto_tlv && data->crypto_binding == REQUIRE_BINDING) {
00537                 wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
00538                 return -1;
00539         }
00540 
00541         if (result_tlv) {
00542                 int status, resp_status;
00543                 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Result TLV",
00544                             result_tlv, result_tlv_len);
00545                 if (result_tlv_len < 2) {
00546                         wpa_printf(MSG_INFO, "EAP-TLV: Too short Result TLV "
00547                                    "(len=%lu)",
00548                                    (unsigned long) result_tlv_len);
00549                         return -1;
00550                 }
00551                 status = WPA_GET_BE16(result_tlv);
00552                 if (status == EAP_TLV_RESULT_SUCCESS) {
00553                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Success "
00554                                    "- EAP-TLV/Phase2 Completed");
00555                         if (force_failure) {
00556                                 wpa_printf(MSG_INFO, "EAP-TLV: Earlier failure"
00557                                            " - force failed Phase 2");
00558                                 resp_status = EAP_TLV_RESULT_FAILURE;
00559                                 ret->decision = DECISION_FAIL;
00560                         } else {
00561                                 resp_status = EAP_TLV_RESULT_SUCCESS;
00562                                 ret->decision = DECISION_UNCOND_SUCC;
00563                         }
00564                 } else if (status == EAP_TLV_RESULT_FAILURE) {
00565                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Failure");
00566                         resp_status = EAP_TLV_RESULT_FAILURE;
00567                         ret->decision = DECISION_FAIL;
00568                 } else {
00569                         wpa_printf(MSG_INFO, "EAP-TLV: Unknown TLV Result "
00570                                    "Status %d", status);
00571                         resp_status = EAP_TLV_RESULT_FAILURE;
00572                         ret->decision = DECISION_FAIL;
00573                 }
00574                 ret->methodState = METHOD_DONE;
00575 
00576                 *resp = eap_tlv_build_result(sm, data, crypto_tlv != NULL,
00577                                              eap_get_id(req), resp_status);
00578         }
00579 
00580         return 0;
00581 }
00582 
00583 
00584 static struct wpabuf * eap_peapv2_tlv_eap_payload(struct wpabuf *buf)
00585 {
00586         struct wpabuf *e;
00587         struct eap_tlv_hdr *tlv;
00588 
00589         if (buf == NULL)
00590                 return NULL;
00591 
00592         /* Encapsulate EAP packet in EAP-Payload TLV */
00593         wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Add EAP-Payload TLV");
00594         e = wpabuf_alloc(sizeof(*tlv) + wpabuf_len(buf));
00595         if (e == NULL) {
00596                 wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Failed to allocate memory "
00597                            "for TLV encapsulation");
00598                 wpabuf_free(buf);
00599                 return NULL;
00600         }
00601         tlv = wpabuf_put(e, sizeof(*tlv));
00602         tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
00603                                      EAP_TLV_EAP_PAYLOAD_TLV);
00604         tlv->length = host_to_be16(wpabuf_len(buf));
00605         wpabuf_put_buf(e, buf);
00606         wpabuf_free(buf);
00607         return e;
00608 }
00609 
00610 
00611 static int eap_peap_phase2_request(struct eap_sm *sm,
00612                                    struct eap_peap_data *data,
00613                                    struct eap_method_ret *ret,
00614                                    struct wpabuf *req,
00615                                    struct wpabuf **resp)
00616 {
00617         struct eap_hdr *hdr = wpabuf_mhead(req);
00618         size_t len = be_to_host16(hdr->length);
00619         u8 *pos;
00620         struct eap_method_ret iret;
00621         struct eap_peer_config *config = eap_get_config(sm);
00622 
00623         if (len <= sizeof(struct eap_hdr)) {
00624                 wpa_printf(MSG_INFO, "EAP-PEAP: too short "
00625                            "Phase 2 request (len=%lu)", (unsigned long) len);
00626                 return -1;
00627         }
00628         pos = (u8 *) (hdr + 1);
00629         wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Request: type=%d", *pos);
00630         switch (*pos) {
00631         case EAP_TYPE_IDENTITY:
00632                 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
00633                 break;
00634         case EAP_TYPE_TLV:
00635                 os_memset(&iret, 0, sizeof(iret));
00636                 if (eap_tlv_process(sm, data, &iret, req, resp,
00637                                     data->phase2_eap_started &&
00638                                     !data->phase2_eap_success)) {
00639                         ret->methodState = METHOD_DONE;
00640                         ret->decision = DECISION_FAIL;
00641                         return -1;
00642                 }
00643                 if (iret.methodState == METHOD_DONE ||
00644                     iret.methodState == METHOD_MAY_CONT) {
00645                         ret->methodState = iret.methodState;
00646                         ret->decision = iret.decision;
00647                         data->phase2_success = 1;
00648                 }
00649                 break;
00650         case EAP_TYPE_EXPANDED:
00651 #ifdef EAP_TNC
00652                 if (data->soh) {
00653                         const u8 *epos;
00654                         size_t eleft;
00655 
00656                         epos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21,
00657                                                 req, &eleft);
00658                         if (epos) {
00659                                 struct wpabuf *buf;
00660                                 wpa_printf(MSG_DEBUG,
00661                                            "EAP-PEAP: SoH EAP Extensions");
00662                                 buf = tncc_process_soh_request(data->soh,
00663                                                                epos, eleft);
00664                                 if (buf) {
00665                                         *resp = eap_msg_alloc(
00666                                                 EAP_VENDOR_MICROSOFT, 0x21,
00667                                                 wpabuf_len(buf),
00668                                                 EAP_CODE_RESPONSE,
00669                                                 hdr->identifier);
00670                                         if (*resp == NULL) {
00671                                                 ret->methodState = METHOD_DONE;
00672                                                 ret->decision = DECISION_FAIL;
00673                                                 return -1;
00674                                         }
00675                                         wpabuf_put_buf(*resp, buf);
00676                                         wpabuf_free(buf);
00677                                         break;
00678                                 }
00679                         }
00680                 }
00681 #endif /* EAP_TNC */
00682                 /* fall through */
00683         default:
00684                 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
00685                     data->phase2_type.method == EAP_TYPE_NONE) {
00686                         size_t i;
00687                         for (i = 0; i < data->num_phase2_types; i++) {
00688                                 if (data->phase2_types[i].vendor !=
00689                                     EAP_VENDOR_IETF ||
00690                                     data->phase2_types[i].method != *pos)
00691                                         continue;
00692 
00693                                 data->phase2_type.vendor =
00694                                         data->phase2_types[i].vendor;
00695                                 data->phase2_type.method =
00696                                         data->phase2_types[i].method;
00697                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Selected "
00698                                            "Phase 2 EAP vendor %d method %d",
00699                                            data->phase2_type.vendor,
00700                                            data->phase2_type.method);
00701                                 break;
00702                         }
00703                 }
00704                 if (*pos != data->phase2_type.method ||
00705                     *pos == EAP_TYPE_NONE) {
00706                         if (eap_peer_tls_phase2_nak(data->phase2_types,
00707                                                     data->num_phase2_types,
00708                                                     hdr, resp))
00709                                 return -1;
00710                         return 0;
00711                 }
00712 
00713                 if (data->phase2_priv == NULL) {
00714                         data->phase2_method = eap_peer_get_eap_method(
00715                                 data->phase2_type.vendor,
00716                                 data->phase2_type.method);
00717                         if (data->phase2_method) {
00718                                 sm->init_phase2 = 1;
00719                                 data->phase2_priv =
00720                                         data->phase2_method->init(sm);
00721                                 sm->init_phase2 = 0;
00722                         }
00723                 }
00724                 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
00725                         wpa_printf(MSG_INFO, "EAP-PEAP: failed to initialize "
00726                                    "Phase 2 EAP method %d", *pos);
00727                         ret->methodState = METHOD_DONE;
00728                         ret->decision = DECISION_FAIL;
00729                         return -1;
00730                 }
00731                 data->phase2_eap_started = 1;
00732                 os_memset(&iret, 0, sizeof(iret));
00733                 *resp = data->phase2_method->process(sm, data->phase2_priv,
00734                                                      &iret, req);
00735                 if ((iret.methodState == METHOD_DONE ||
00736                      iret.methodState == METHOD_MAY_CONT) &&
00737                     (iret.decision == DECISION_UNCOND_SUCC ||
00738                      iret.decision == DECISION_COND_SUCC)) {
00739                         data->phase2_eap_success = 1;
00740                         data->phase2_success = 1;
00741                 }
00742                 break;
00743         }
00744 
00745         if (*resp == NULL &&
00746             (config->pending_req_identity || config->pending_req_password ||
00747              config->pending_req_otp || config->pending_req_new_password)) {
00748                 wpabuf_free(data->pending_phase2_req);
00749                 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
00750         }
00751 
00752         return 0;
00753 }
00754 
00755 
00756 static int eap_peap_decrypt(struct eap_sm *sm, struct eap_peap_data *data,
00757                             struct eap_method_ret *ret,
00758                             const struct eap_hdr *req,
00759                             const struct wpabuf *in_data,
00760                             struct wpabuf **out_data)
00761 {
00762         struct wpabuf *in_decrypted = NULL;
00763         int res, skip_change = 0;
00764         struct eap_hdr *hdr, *rhdr;
00765         struct wpabuf *resp = NULL;
00766         size_t len;
00767 
00768         wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
00769                    " Phase 2", (unsigned long) wpabuf_len(in_data));
00770 
00771         if (data->pending_phase2_req) {
00772                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 request - "
00773                            "skip decryption and use old data");
00774                 /* Clear TLS reassembly state. */
00775                 eap_peer_tls_reset_input(&data->ssl);
00776                 in_decrypted = data->pending_phase2_req;
00777                 data->pending_phase2_req = NULL;
00778                 skip_change = 1;
00779                 goto continue_req;
00780         }
00781 
00782         if (wpabuf_len(in_data) == 0 && sm->workaround &&
00783             data->phase2_success) {
00784                 /*
00785                  * Cisco ACS seems to be using TLS ACK to terminate
00786                  * EAP-PEAPv0/GTC. Try to reply with TLS ACK.
00787                  */
00788                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Received TLS ACK, but "
00789                            "expected data - acknowledge with TLS ACK since "
00790                            "Phase 2 has been completed");
00791                 ret->decision = DECISION_COND_SUCC;
00792                 ret->methodState = METHOD_DONE;
00793                 return 1;
00794         } else if (wpabuf_len(in_data) == 0) {
00795                 /* Received TLS ACK - requesting more fragments */
00796                 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
00797                                             data->peap_version,
00798                                             req->identifier, NULL, out_data);
00799         }
00800 
00801         res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
00802         if (res)
00803                 return res;
00804 
00805 continue_req:
00806         wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
00807                         in_decrypted);
00808 
00809         hdr = wpabuf_mhead(in_decrypted);
00810         if (wpabuf_len(in_decrypted) == 5 && hdr->code == EAP_CODE_REQUEST &&
00811             be_to_host16(hdr->length) == 5 &&
00812             eap_get_type(in_decrypted) == EAP_TYPE_IDENTITY) {
00813                 /* At least FreeRADIUS seems to send full EAP header with
00814                  * EAP Request Identity */
00815                 skip_change = 1;
00816         }
00817         if (wpabuf_len(in_decrypted) >= 5 && hdr->code == EAP_CODE_REQUEST &&
00818             eap_get_type(in_decrypted) == EAP_TYPE_TLV) {
00819                 skip_change = 1;
00820         }
00821 
00822         if (data->peap_version == 0 && !skip_change) {
00823                 struct eap_hdr *nhdr;
00824                 struct wpabuf *nmsg = wpabuf_alloc(sizeof(struct eap_hdr) +
00825                                                    wpabuf_len(in_decrypted));
00826                 if (nmsg == NULL) {
00827                         wpabuf_free(in_decrypted);
00828                         return 0;
00829                 }
00830                 nhdr = wpabuf_put(nmsg, sizeof(*nhdr));
00831                 wpabuf_put_buf(nmsg, in_decrypted);
00832                 nhdr->code = req->code;
00833                 nhdr->identifier = req->identifier;
00834                 nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
00835                                             wpabuf_len(in_decrypted));
00836 
00837                 wpabuf_free(in_decrypted);
00838                 in_decrypted = nmsg;
00839         }
00840 
00841         if (data->peap_version >= 2) {
00842                 struct eap_tlv_hdr *tlv;
00843                 struct wpabuf *nmsg;
00844 
00845                 if (wpabuf_len(in_decrypted) < sizeof(*tlv) + sizeof(*hdr)) {
00846                         wpa_printf(MSG_INFO, "EAP-PEAPv2: Too short Phase 2 "
00847                                    "EAP TLV");
00848                         wpabuf_free(in_decrypted);
00849                         return 0;
00850                 }
00851                 tlv = wpabuf_mhead(in_decrypted);
00852                 if ((be_to_host16(tlv->tlv_type) & 0x3fff) !=
00853                     EAP_TLV_EAP_PAYLOAD_TLV) {
00854                         wpa_printf(MSG_INFO, "EAP-PEAPv2: Not an EAP TLV");
00855                         wpabuf_free(in_decrypted);
00856                         return 0;
00857                 }
00858                 if (sizeof(*tlv) + be_to_host16(tlv->length) >
00859                     wpabuf_len(in_decrypted)) {
00860                         wpa_printf(MSG_INFO, "EAP-PEAPv2: Invalid EAP TLV "
00861                                    "length");
00862                         wpabuf_free(in_decrypted);
00863                         return 0;
00864                 }
00865                 hdr = (struct eap_hdr *) (tlv + 1);
00866                 if (be_to_host16(hdr->length) > be_to_host16(tlv->length)) {
00867                         wpa_printf(MSG_INFO, "EAP-PEAPv2: No room for full "
00868                                    "EAP packet in EAP TLV");
00869                         wpabuf_free(in_decrypted);
00870                         return 0;
00871                 }
00872 
00873                 nmsg = wpabuf_alloc(be_to_host16(hdr->length));
00874                 if (nmsg == NULL) {
00875                         wpabuf_free(in_decrypted);
00876                         return 0;
00877                 }
00878 
00879                 wpabuf_put_data(nmsg, hdr, be_to_host16(hdr->length));
00880                 wpabuf_free(in_decrypted);
00881                 in_decrypted = nmsg;
00882         }
00883 
00884         hdr = wpabuf_mhead(in_decrypted);
00885         if (wpabuf_len(in_decrypted) < sizeof(*hdr)) {
00886                 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
00887                            "EAP frame (len=%lu)",
00888                            (unsigned long) wpabuf_len(in_decrypted));
00889                 wpabuf_free(in_decrypted);
00890                 return 0;
00891         }
00892         len = be_to_host16(hdr->length);
00893         if (len > wpabuf_len(in_decrypted)) {
00894                 wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
00895                            "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
00896                            (unsigned long) wpabuf_len(in_decrypted),
00897                            (unsigned long) len);
00898                 wpabuf_free(in_decrypted);
00899                 return 0;
00900         }
00901         if (len < wpabuf_len(in_decrypted)) {
00902                 wpa_printf(MSG_INFO, "EAP-PEAP: Odd.. Phase 2 EAP header has "
00903                            "shorter length than full decrypted data "
00904                            "(%lu < %lu)",
00905                            (unsigned long) len,
00906                            (unsigned long) wpabuf_len(in_decrypted));
00907         }
00908         wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
00909                    "identifier=%d length=%lu", hdr->code, hdr->identifier,
00910                    (unsigned long) len);
00911         switch (hdr->code) {
00912         case EAP_CODE_REQUEST:
00913                 if (eap_peap_phase2_request(sm, data, ret, in_decrypted,
00914                                             &resp)) {
00915                         wpabuf_free(in_decrypted);
00916                         wpa_printf(MSG_INFO, "EAP-PEAP: Phase2 Request "
00917                                    "processing failed");
00918                         return 0;
00919                 }
00920                 break;
00921         case EAP_CODE_SUCCESS:
00922                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
00923                 if (data->peap_version == 1) {
00924                         /* EAP-Success within TLS tunnel is used to indicate
00925                          * shutdown of the TLS channel. The authentication has
00926                          * been completed. */
00927                         if (data->phase2_eap_started &&
00928                             !data->phase2_eap_success) {
00929                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 "
00930                                            "Success used to indicate success, "
00931                                            "but Phase 2 EAP was not yet "
00932                                            "completed successfully");
00933                                 ret->methodState = METHOD_DONE;
00934                                 ret->decision = DECISION_FAIL;
00935                                 wpabuf_free(in_decrypted);
00936                                 return 0;
00937                         }
00938                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - "
00939                                    "EAP-Success within TLS tunnel - "
00940                                    "authentication completed");
00941                         ret->decision = DECISION_UNCOND_SUCC;
00942                         ret->methodState = METHOD_DONE;
00943                         data->phase2_success = 1;
00944                         if (data->peap_outer_success == 2) {
00945                                 wpabuf_free(in_decrypted);
00946                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK "
00947                                            "to finish authentication");
00948                                 return 1;
00949                         } else if (data->peap_outer_success == 1) {
00950                                 /* Reply with EAP-Success within the TLS
00951                                  * channel to complete the authentication. */
00952                                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
00953                                 if (resp) {
00954                                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
00955                                         rhdr->code = EAP_CODE_SUCCESS;
00956                                         rhdr->identifier = hdr->identifier;
00957                                         rhdr->length =
00958                                                 host_to_be16(sizeof(*rhdr));
00959                                 }
00960                         } else {
00961                                 /* No EAP-Success expected for Phase 1 (outer,
00962                                  * unencrypted auth), so force EAP state
00963                                  * machine to SUCCESS state. */
00964                                 sm->peap_done = TRUE;
00965                         }
00966                 } else {
00967                         /* FIX: ? */
00968                 }
00969                 break;
00970         case EAP_CODE_FAILURE:
00971                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
00972                 ret->decision = DECISION_FAIL;
00973                 ret->methodState = METHOD_MAY_CONT;
00974                 ret->allowNotifications = FALSE;
00975                 /* Reply with EAP-Failure within the TLS channel to complete
00976                  * failure reporting. */
00977                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
00978                 if (resp) {
00979                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
00980                         rhdr->code = EAP_CODE_FAILURE;
00981                         rhdr->identifier = hdr->identifier;
00982                         rhdr->length = host_to_be16(sizeof(*rhdr));
00983                 }
00984                 break;
00985         default:
00986                 wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
00987                            "Phase 2 EAP header", hdr->code);
00988                 break;
00989         }
00990 
00991         wpabuf_free(in_decrypted);
00992 
00993         if (resp) {
00994                 int skip_change2 = 0;
00995                 struct wpabuf *rmsg, buf;
00996 
00997                 wpa_hexdump_buf_key(MSG_DEBUG,
00998                                     "EAP-PEAP: Encrypting Phase 2 data", resp);
00999                 /* PEAP version changes */
01000                 if (data->peap_version >= 2) {
01001                         resp = eap_peapv2_tlv_eap_payload(resp);
01002                         if (resp == NULL)
01003                                 return -1;
01004                 }
01005                 if (wpabuf_len(resp) >= 5 &&
01006                     wpabuf_head_u8(resp)[0] == EAP_CODE_RESPONSE &&
01007                     eap_get_type(resp) == EAP_TYPE_TLV)
01008                         skip_change2 = 1;
01009                 rmsg = resp;
01010                 if (data->peap_version == 0 && !skip_change2) {
01011                         wpabuf_set(&buf, wpabuf_head_u8(resp) +
01012                                    sizeof(struct eap_hdr),
01013                                    wpabuf_len(resp) - sizeof(struct eap_hdr));
01014                         rmsg = &buf;
01015                 }
01016 
01017                 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
01018                                          data->peap_version, req->identifier,
01019                                          rmsg, out_data)) {
01020                         wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt "
01021                                    "a Phase 2 frame");
01022                 }
01023                 wpabuf_free(resp);
01024         }
01025 
01026         return 0;
01027 }
01028 
01029 
01030 static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
01031                                         struct eap_method_ret *ret,
01032                                         const struct wpabuf *reqData)
01033 {
01034         const struct eap_hdr *req;
01035         size_t left;
01036         int res;
01037         u8 flags, id;
01038         struct wpabuf *resp;
01039         const u8 *pos;
01040         struct eap_peap_data *data = priv;
01041 
01042         pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret,
01043                                         reqData, &left, &flags);
01044         if (pos == NULL)
01045                 return NULL;
01046         req = wpabuf_head(reqData);
01047         id = req->identifier;
01048 
01049         if (flags & EAP_TLS_FLAGS_START) {
01050                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Start (server ver=%d, own "
01051                            "ver=%d)", flags & EAP_TLS_VERSION_MASK,
01052                         data->peap_version);
01053                 if ((flags & EAP_TLS_VERSION_MASK) < data->peap_version)
01054                         data->peap_version = flags & EAP_TLS_VERSION_MASK;
01055                 if (data->force_peap_version >= 0 &&
01056                     data->force_peap_version != data->peap_version) {
01057                         wpa_printf(MSG_WARNING, "EAP-PEAP: Failed to select "
01058                                    "forced PEAP version %d",
01059                                    data->force_peap_version);
01060                         ret->methodState = METHOD_DONE;
01061                         ret->decision = DECISION_FAIL;
01062                         ret->allowNotifications = FALSE;
01063                         return NULL;
01064                 }
01065                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Using PEAP version %d",
01066                            data->peap_version);
01067                 left = 0; /* make sure that this frame is empty, even though it
01068                            * should always be, anyway */
01069         }
01070 
01071         resp = NULL;
01072         if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
01073             !data->resuming) {
01074                 struct wpabuf msg;
01075                 wpabuf_set(&msg, pos, left);
01076                 res = eap_peap_decrypt(sm, data, ret, req, &msg, &resp);
01077         } else {
01078                 res = eap_peer_tls_process_helper(sm, &data->ssl,
01079                                                   EAP_TYPE_PEAP,
01080                                                   data->peap_version, id, pos,
01081                                                   left, &resp);
01082 
01083                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
01084                         char *label;
01085                         wpa_printf(MSG_DEBUG,
01086                                    "EAP-PEAP: TLS done, proceed to Phase 2");
01087                         os_free(data->key_data);
01088                         /* draft-josefsson-ppext-eap-tls-eap-05.txt
01089                          * specifies that PEAPv1 would use "client PEAP
01090                          * encryption" as the label. However, most existing
01091                          * PEAPv1 implementations seem to be using the old
01092                          * label, "client EAP encryption", instead. Use the old
01093                          * label by default, but allow it to be configured with
01094                          * phase1 parameter peaplabel=1. */
01095                         if (data->peap_version > 1 || data->force_new_label)
01096                                 label = "client PEAP encryption";
01097                         else
01098                                 label = "client EAP encryption";
01099                         wpa_printf(MSG_DEBUG, "EAP-PEAP: using label '%s' in "
01100                                    "key derivation", label);
01101                         data->key_data =
01102                                 eap_peer_tls_derive_key(sm, &data->ssl, label,
01103                                                         EAP_TLS_KEY_LEN);
01104                         if (data->key_data) {
01105                                 wpa_hexdump_key(MSG_DEBUG, 
01106                                                 "EAP-PEAP: Derived key",
01107                                                 data->key_data,
01108                                                 EAP_TLS_KEY_LEN);
01109                         } else {
01110                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to "
01111                                            "derive key");
01112                         }
01113 
01114                         if (sm->workaround && data->resuming) {
01115                                 /*
01116                                  * At least few RADIUS servers (Aegis v1.1.6;
01117                                  * but not v1.1.4; and Cisco ACS) seem to be
01118                                  * terminating PEAPv1 (Aegis) or PEAPv0 (Cisco
01119                                  * ACS) session resumption with outer
01120                                  * EAP-Success. This does not seem to follow
01121                                  * draft-josefsson-pppext-eap-tls-eap-05.txt
01122                                  * section 4.2, so only allow this if EAP
01123                                  * workarounds are enabled.
01124                                  */
01125                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Workaround - "
01126                                            "allow outer EAP-Success to "
01127                                            "terminate PEAP resumption");
01128                                 ret->decision = DECISION_COND_SUCC;
01129                                 data->phase2_success = 1;
01130                         }
01131 
01132                         data->resuming = 0;
01133                 }
01134 
01135                 if (res == 2) {
01136                         struct wpabuf msg;
01137                         /*
01138                          * Application data included in the handshake message.
01139                          */
01140                         wpabuf_free(data->pending_phase2_req);
01141                         data->pending_phase2_req = resp;
01142                         resp = NULL;
01143                         wpabuf_set(&msg, pos, left);
01144                         res = eap_peap_decrypt(sm, data, ret, req, &msg,
01145                                                &resp);
01146                 }
01147         }
01148 
01149         if (ret->methodState == METHOD_DONE) {
01150                 ret->allowNotifications = FALSE;
01151         }
01152 
01153         if (res == 1) {
01154                 wpabuf_free(resp);
01155                 return eap_peer_tls_build_ack(id, EAP_TYPE_PEAP,
01156                                               data->peap_version);
01157         }
01158 
01159         return resp;
01160 }
01161 
01162 
01163 static Boolean eap_peap_has_reauth_data(struct eap_sm *sm, void *priv)
01164 {
01165         struct eap_peap_data *data = priv;
01166         return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
01167                 data->phase2_success;
01168 }
01169 
01170 
01171 static void eap_peap_deinit_for_reauth(struct eap_sm *sm, void *priv)
01172 {
01173         struct eap_peap_data *data = priv;
01174         wpabuf_free(data->pending_phase2_req);
01175         data->pending_phase2_req = NULL;
01176         data->crypto_binding_used = 0;
01177 }
01178 
01179 
01180 static void * eap_peap_init_for_reauth(struct eap_sm *sm, void *priv)
01181 {
01182         struct eap_peap_data *data = priv;
01183         os_free(data->key_data);
01184         data->key_data = NULL;
01185         if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
01186                 os_free(data);
01187                 return NULL;
01188         }
01189         if (data->phase2_priv && data->phase2_method &&
01190             data->phase2_method->init_for_reauth)
01191                 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
01192         data->phase2_success = 0;
01193         data->phase2_eap_success = 0;
01194         data->phase2_eap_started = 0;
01195         data->resuming = 1;
01196         data->reauth = 1;
01197         sm->peap_done = FALSE;
01198         return priv;
01199 }
01200 
01201 
01202 static int eap_peap_get_status(struct eap_sm *sm, void *priv, char *buf,
01203                                size_t buflen, int verbose)
01204 {
01205         struct eap_peap_data *data = priv;
01206         int len, ret;
01207 
01208         len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
01209         if (data->phase2_method) {
01210                 ret = os_snprintf(buf + len, buflen - len,
01211                                   "EAP-PEAPv%d Phase2 method=%s\n",
01212                                   data->peap_version,
01213                                   data->phase2_method->name);
01214                 if (ret < 0 || (size_t) ret >= buflen - len)
01215                         return len;
01216                 len += ret;
01217         }
01218         return len;
01219 }
01220 
01221 
01222 static Boolean eap_peap_isKeyAvailable(struct eap_sm *sm, void *priv)
01223 {
01224         struct eap_peap_data *data = priv;
01225         return data->key_data != NULL && data->phase2_success;
01226 }
01227 
01228 
01229 static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
01230 {
01231         struct eap_peap_data *data = priv;
01232         u8 *key;
01233 
01234         if (data->key_data == NULL || !data->phase2_success)
01235                 return NULL;
01236 
01237         key = os_malloc(EAP_TLS_KEY_LEN);
01238         if (key == NULL)
01239                 return NULL;
01240 
01241         *len = EAP_TLS_KEY_LEN;
01242 
01243         if (data->crypto_binding_used) {
01244                 u8 csk[128];
01245                 /*
01246                  * Note: It looks like Microsoft implementation requires null
01247                  * termination for this label while the one used for deriving
01248                  * IPMK|CMK did not use null termination.
01249                  */
01250                 peap_prfplus(data->peap_version, data->ipmk, 40,
01251                              "Session Key Generating Function",
01252                              (u8 *) "\00", 1, csk, sizeof(csk));
01253                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
01254                 os_memcpy(key, csk, EAP_TLS_KEY_LEN);
01255                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
01256                             key, EAP_TLS_KEY_LEN);
01257         } else
01258                 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
01259 
01260         return key;
01261 }
01262 
01263 
01264 int eap_peer_peap_register(void)
01265 {
01266         struct eap_method *eap;
01267         int ret;
01268 
01269         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
01270                                     EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
01271         if (eap == NULL)
01272                 return -1;
01273 
01274         eap->init = eap_peap_init;
01275         eap->deinit = eap_peap_deinit;
01276         eap->process = eap_peap_process;
01277         eap->isKeyAvailable = eap_peap_isKeyAvailable;
01278         eap->getKey = eap_peap_getKey;
01279         eap->get_status = eap_peap_get_status;
01280         eap->has_reauth_data = eap_peap_has_reauth_data;
01281         eap->deinit_for_reauth = eap_peap_deinit_for_reauth;
01282         eap->init_for_reauth = eap_peap_init_for_reauth;
01283 
01284         ret = eap_peer_method_register(eap);
01285         if (ret)
01286                 eap_peer_method_free(eap);
01287         return ret;
01288 }
eap_peap.c
