eap_server_mschapv2.c revision 1f69aa52ea2e0a73ac502565df8c666ee49cab6a
18d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt/* 28d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * hostapd / EAP-MSCHAPv2 (draft-kamath-pppext-eap-mschapv2-00.txt) server 38d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi> 48d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 58d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * This program is free software; you can redistribute it and/or modify 68d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * it under the terms of the GNU General Public License version 2 as 78d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * published by the Free Software Foundation. 88d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 98d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * Alternatively, this software may be distributed under the terms of BSD 108d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * license. 118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * See README and COPYING for more details. 138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt */ 148d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 158d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "includes.h" 168d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 178d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "common.h" 188d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "crypto/ms_funcs.h" 198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "crypto/random.h" 208d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "eap_i.h" 218d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 238d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstruct eap_mschapv2_hdr { 248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 op_code; /* MSCHAPV2_OP_* */ 258d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 mschapv2_id; /* must be changed for challenges, but not for 268d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * success/failure */ 278d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 ms_length[2]; /* Note: misaligned; length - 5 */ 288d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* followed by data */ 298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} STRUCT_PACKED; 308d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 318d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define MSCHAPV2_OP_CHALLENGE 1 328d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define MSCHAPV2_OP_RESPONSE 2 338d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define MSCHAPV2_OP_SUCCESS 3 348d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define MSCHAPV2_OP_FAILURE 4 358d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define MSCHAPV2_OP_CHANGE_PASSWORD 7 368d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 378d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define MSCHAPV2_RESP_LEN 49 388d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 398d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define ERROR_RESTRICTED_LOGON_HOURS 646 408d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define ERROR_ACCT_DISABLED 647 418d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define ERROR_PASSWD_EXPIRED 648 428d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define ERROR_NO_DIALIN_PERMISSION 649 438d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define ERROR_AUTHENTICATION_FAILURE 691 448d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define ERROR_CHANGING_PASSWORD 709 458d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 468d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define PASSWD_CHANGE_CHAL_LEN 16 478d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define MSCHAPV2_KEY_LEN 16 488d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 498d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 508d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define CHALLENGE_LEN 16 518d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 528d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstruct eap_mschapv2_data { 538d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 auth_challenge[CHALLENGE_LEN]; 548d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int auth_challenge_from_tls; 558d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 *peer_challenge; 568d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 auth_response[20]; 578d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt enum { CHALLENGE, SUCCESS_REQ, FAILURE_REQ, SUCCESS, FAILURE } state; 588d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 resp_mschapv2_id; 598d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 master_key[16]; 608d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int master_key_valid; 618d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt}; 628d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 638d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 648d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic void * eap_mschapv2_init(struct eap_sm *sm) 658d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 668d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_mschapv2_data *data; 678d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 688d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data = os_zalloc(sizeof(*data)); 698d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (data == NULL) 708d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return NULL; 718d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->state = CHALLENGE; 728d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 738d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (sm->auth_challenge) { 748d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memcpy(data->auth_challenge, sm->auth_challenge, 758d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt CHALLENGE_LEN); 768d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->auth_challenge_from_tls = 1; 778d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 788d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 798d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (sm->peer_challenge) { 808d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->peer_challenge = os_malloc(CHALLENGE_LEN); 818d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (data->peer_challenge == NULL) { 828d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_free(data); 838d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return NULL; 848d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 858d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memcpy(data->peer_challenge, sm->peer_challenge, 868d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt CHALLENGE_LEN); 878d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 888d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 898d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return data; 908d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 918d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 928d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 938d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic void eap_mschapv2_reset(struct eap_sm *sm, void *priv) 948d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 958d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_mschapv2_data *data = priv; 968d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (data == NULL) 978d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return; 988d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 998d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_free(data->peer_challenge); 1008d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_free(data); 1018d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 1028d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1038d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1048d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic struct wpabuf * eap_mschapv2_build_challenge( 1058d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_sm *sm, struct eap_mschapv2_data *data, u8 id) 1068d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 1078d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct wpabuf *req; 1088d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_mschapv2_hdr *ms; 1098d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt char *name = "hostapd"; /* TODO: make this configurable */ 1108d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt size_t ms_len; 1118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (!data->auth_challenge_from_tls && 1138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt random_get_bytes(data->auth_challenge, CHALLENGE_LEN)) { 1148d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_ERROR, "EAP-MSCHAPV2: Failed to get random " 1158d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt "data"); 1168d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->state = FAILURE; 1178d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return NULL; 1188d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 1198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1208d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ms_len = sizeof(*ms) + 1 + CHALLENGE_LEN + os_strlen(name); 1218d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_MSCHAPV2, ms_len, 1228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt EAP_CODE_REQUEST, id); 1238d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (req == NULL) { 1248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_ERROR, "EAP-MSCHAPV2: Failed to allocate memory" 1258d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt " for request"); 1268d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->state = FAILURE; 1278d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return NULL; 1288d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 1298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1308d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ms = wpabuf_put(req, sizeof(*ms)); 1318d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ms->op_code = MSCHAPV2_OP_CHALLENGE; 1328d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ms->mschapv2_id = id; 1338d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt WPA_PUT_BE16(ms->ms_length, ms_len); 1348d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1358d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpabuf_put_u8(req, CHALLENGE_LEN); 1368d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (!data->auth_challenge_from_tls) 1378d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpabuf_put_data(req, data->auth_challenge, CHALLENGE_LEN); 1388d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt else 1398d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpabuf_put(req, CHALLENGE_LEN); 1408d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_hexdump(MSG_MSGDUMP, "EAP-MSCHAPV2: Challenge", 1418d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->auth_challenge, CHALLENGE_LEN); 1428d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpabuf_put_data(req, name, os_strlen(name)); 1438d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1448d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return req; 1458d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 1468d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1478d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1488d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic struct wpabuf * eap_mschapv2_build_success_req( 1498d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_sm *sm, struct eap_mschapv2_data *data, u8 id) 1508d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 1518d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct wpabuf *req; 1528d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_mschapv2_hdr *ms; 1538d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 *msg; 1548d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt char *message = "OK"; 1558d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt size_t ms_len; 1568d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1578d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ms_len = sizeof(*ms) + 2 + 2 * sizeof(data->auth_response) + 1 + 2 + 1588d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_strlen(message); 1598d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_MSCHAPV2, ms_len, 1608d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt EAP_CODE_REQUEST, id); 1618d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (req == NULL) { 1628d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_ERROR, "EAP-MSCHAPV2: Failed to allocate memory" 1638d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt " for request"); 1648d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->state = FAILURE; 1658d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return NULL; 1668d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 1678d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1688d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ms = wpabuf_put(req, sizeof(*ms)); 1698d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ms->op_code = MSCHAPV2_OP_SUCCESS; 1708d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ms->mschapv2_id = data->resp_mschapv2_id; 1718d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt WPA_PUT_BE16(ms->ms_length, ms_len); 1728d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt msg = (u8 *) (ms + 1); 1738d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1748d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpabuf_put_u8(req, 'S'); 1758d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpabuf_put_u8(req, '='); 1768d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_snprintf_hex_uppercase( 1778d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpabuf_put(req, sizeof(data->auth_response) * 2), 1788d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt sizeof(data->auth_response) * 2 + 1, 1798d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->auth_response, sizeof(data->auth_response)); 1808d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpabuf_put_u8(req, ' '); 1818d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpabuf_put_u8(req, 'M'); 1828d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpabuf_put_u8(req, '='); 1838d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpabuf_put_data(req, message, os_strlen(message)); 1848d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1858d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-MSCHAPV2: Success Request Message", 1868d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt msg, ms_len - sizeof(*ms)); 1878d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1888d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return req; 1898d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 1908d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1918d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1928d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic struct wpabuf * eap_mschapv2_build_failure_req( 1938d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_sm *sm, struct eap_mschapv2_data *data, u8 id) 1948d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 1958d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct wpabuf *req; 1968d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_mschapv2_hdr *ms; 1978d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt char *message = "E=691 R=0 C=00000000000000000000000000000000 V=3 " 1988d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt "M=FAILED"; 1998d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt size_t ms_len; 2008d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2018d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ms_len = sizeof(*ms) + os_strlen(message); 2028d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_MSCHAPV2, ms_len, 2038d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt EAP_CODE_REQUEST, id); 2048d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (req == NULL) { 2058d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_ERROR, "EAP-MSCHAPV2: Failed to allocate memory" 2068d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt " for request"); 2078d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->state = FAILURE; 2088d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return NULL; 2098d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 2108d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ms = wpabuf_put(req, sizeof(*ms)); 2128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ms->op_code = MSCHAPV2_OP_FAILURE; 2138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ms->mschapv2_id = data->resp_mschapv2_id; 2148d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt WPA_PUT_BE16(ms->ms_length, ms_len); 2158d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2168d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpabuf_put_data(req, message, os_strlen(message)); 2178d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2188d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-MSCHAPV2: Failure Request Message", 2198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt (u8 *) message, os_strlen(message)); 2208d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2218d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return req; 2228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 2238d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2258d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic struct wpabuf * eap_mschapv2_buildReq(struct eap_sm *sm, void *priv, 2268d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 id) 2278d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 2288d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_mschapv2_data *data = priv; 2298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2308d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt switch (data->state) { 2318d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt case CHALLENGE: 2328d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return eap_mschapv2_build_challenge(sm, data, id); 2338d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt case SUCCESS_REQ: 2348d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return eap_mschapv2_build_success_req(sm, data, id); 2358d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt case FAILURE_REQ: 2368d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return eap_mschapv2_build_failure_req(sm, data, id); 2378d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt default: 2388d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Unknown state %d in " 2398d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt "buildReq", data->state); 2408d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt break; 2418d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 2428d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return NULL; 2438d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 2448d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2458d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2468d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic Boolean eap_mschapv2_check(struct eap_sm *sm, void *priv, 2478d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct wpabuf *respData) 2488d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 2498d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_mschapv2_data *data = priv; 2508d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_mschapv2_hdr *resp; 2518d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt const u8 *pos; 2528d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt size_t len; 2538d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2548d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_MSCHAPV2, respData, 2558d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt &len); 2568d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (pos == NULL || len < 1) { 2578d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_INFO, "EAP-MSCHAPV2: Invalid frame"); 2588d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return TRUE; 2598d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 2608d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2618d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt resp = (struct eap_mschapv2_hdr *) pos; 2628d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (data->state == CHALLENGE && 2638d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt resp->op_code != MSCHAPV2_OP_RESPONSE) { 2648d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Expected Response - " 2658d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt "ignore op %d", resp->op_code); 2668d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return TRUE; 2678d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 2688d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2698d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (data->state == SUCCESS_REQ && 2708d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt resp->op_code != MSCHAPV2_OP_SUCCESS && 2718d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt resp->op_code != MSCHAPV2_OP_FAILURE) { 2728d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Expected Success or " 2738d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt "Failure - ignore op %d", resp->op_code); 2748d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return TRUE; 2758d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 2768d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2778d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (data->state == FAILURE_REQ && 2788d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt resp->op_code != MSCHAPV2_OP_FAILURE) { 2798d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Expected Failure " 2808d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt "- ignore op %d", resp->op_code); 2818d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return TRUE; 2828d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 2838d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2848d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return FALSE; 2858d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 2868d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2878d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2888d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic void eap_mschapv2_process_response(struct eap_sm *sm, 2898d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_mschapv2_data *data, 2908d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct wpabuf *respData) 2918d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 2928d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_mschapv2_hdr *resp; 2938d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt const u8 *pos, *end, *peer_challenge, *nt_response, *name; 2948d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 flags; 2958d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt size_t len, name_len, i; 2968d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 expected[24]; 2978d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt const u8 *username, *user; 2988d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt size_t username_len, user_len; 2998d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int res; 3008d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 3018d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_MSCHAPV2, respData, 3028d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt &len); 3038d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (pos == NULL || len < 1) 3048d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return; /* Should not happen - frame already validated */ 3058d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 3068d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt end = pos + len; 3078d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt resp = (struct eap_mschapv2_hdr *) pos; 3088d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt pos = (u8 *) (resp + 1); 3098d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 3108d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (len < sizeof(*resp) + 1 + 49 || 3118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt resp->op_code != MSCHAPV2_OP_RESPONSE || 3128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt pos[0] != 49) { 3138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_hexdump_buf(MSG_DEBUG, "EAP-MSCHAPV2: Invalid response", 3148d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt respData); 3158d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->state = FAILURE; 3168d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return; 3178d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 3188d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->resp_mschapv2_id = resp->mschapv2_id; 3198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt pos++; 3208d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt peer_challenge = pos; 3218d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt pos += 16 + 8; 3228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt nt_response = pos; 3238d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt pos += 24; 3248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt flags = *pos++; 3258d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt name = pos; 3268d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt name_len = end - name; 3278d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 3288d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (data->peer_challenge) { 3298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Using pre-configured " 3308d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt "Peer-Challenge"); 3318d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt peer_challenge = data->peer_challenge; 3328d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 3338d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_hexdump(MSG_MSGDUMP, "EAP-MSCHAPV2: Peer-Challenge", 3348d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt peer_challenge, 16); 3358d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_hexdump(MSG_MSGDUMP, "EAP-MSCHAPV2: NT-Response", nt_response, 24); 3368d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_MSGDUMP, "EAP-MSCHAPV2: Flags 0x%x", flags); 3378d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-MSCHAPV2: Name", name, name_len); 3388d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 3398d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* MSCHAPv2 does not include optional domain name in the 3408d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * challenge-response calculation, so remove domain prefix 3418d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * (if present). */ 3428d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt username = sm->identity; 3438d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt username_len = sm->identity_len; 3448d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (i = 0; i < username_len; i++) { 3458d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (username[i] == '\\') { 3468d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt username_len -= i + 1; 3478d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt username += i + 1; 3488d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt break; 3498d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 3508d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 3518d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 3528d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt user = name; 3538d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt user_len = name_len; 3548d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (i = 0; i < user_len; i++) { 3558d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (user[i] == '\\') { 3568d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt user_len -= i + 1; 3578d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt user += i + 1; 3588d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt break; 3598d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 3608d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 3618d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 3628d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (username_len != user_len || 3638d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memcmp(username, user, username_len) != 0) { 3648d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Mismatch in user names"); 3658d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_hexdump_ascii(MSG_DEBUG, "EAP-MSCHAPV2: Expected user " 3668d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt "name", username, username_len); 3678d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_hexdump_ascii(MSG_DEBUG, "EAP-MSCHAPV2: Received user " 3688d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt "name", user, user_len); 3698d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->state = FAILURE; 3708d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return; 3718d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 3728d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 3738d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-MSCHAPV2: User name", 3748d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt username, username_len); 3758d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 3768d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (sm->user->password_hash) { 3778d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt res = generate_nt_response_pwhash(data->auth_challenge, 3788d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt peer_challenge, 3798d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt username, username_len, 3808d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt sm->user->password, 3818d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt expected); 3828d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } else { 3838d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt res = generate_nt_response(data->auth_challenge, 3848d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt peer_challenge, 3858d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt username, username_len, 3868d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt sm->user->password, 3878d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt sm->user->password_len, 3888d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt expected); 3898d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 3908d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (res) { 3918d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->state = FAILURE; 3928d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return; 3938d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 3948d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 3958d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (os_memcmp(nt_response, expected, 24) == 0) { 3968d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt const u8 *pw_hash; 3978d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 pw_hash_buf[16], pw_hash_hash[16]; 3988d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 3998d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Correct NT-Response"); 4008d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->state = SUCCESS_REQ; 4018d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 4028d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* Authenticator response is not really needed yet, but 4038d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * calculate it here so that peer_challenge and username need 4048d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * not be saved. */ 4058d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (sm->user->password_hash) { 4068d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt pw_hash = sm->user->password; 4078d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } else { 4081f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt if (nt_password_hash(sm->user->password, 4091f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt sm->user->password_len, 4101f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt pw_hash_buf) < 0) { 4111f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt data->state = FAILURE; 4121f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt return; 4131f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt } 4148d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt pw_hash = pw_hash_buf; 4158d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 4168d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt generate_authenticator_response_pwhash( 4178d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt pw_hash, peer_challenge, data->auth_challenge, 4188d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt username, username_len, nt_response, 4198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->auth_response); 4208d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 4218d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt hash_nt_password_hash(pw_hash, pw_hash_hash); 4228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt get_master_key(pw_hash_hash, nt_response, data->master_key); 4238d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->master_key_valid = 1; 4248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_hexdump_key(MSG_DEBUG, "EAP-MSCHAPV2: Derived Master Key", 4258d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->master_key, MSCHAPV2_KEY_LEN); 4268d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } else { 4278d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_hexdump(MSG_MSGDUMP, "EAP-MSCHAPV2: Expected NT-Response", 4288d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt expected, 24); 4298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Invalid NT-Response"); 4308d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->state = FAILURE_REQ; 4318d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 4328d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 4338d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 4348d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 4358d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic void eap_mschapv2_process_success_resp(struct eap_sm *sm, 4368d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_mschapv2_data *data, 4378d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct wpabuf *respData) 4388d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 4398d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_mschapv2_hdr *resp; 4408d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt const u8 *pos; 4418d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt size_t len; 4428d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 4438d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_MSCHAPV2, respData, 4448d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt &len); 4458d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (pos == NULL || len < 1) 4468d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return; /* Should not happen - frame already validated */ 4478d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 4488d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt resp = (struct eap_mschapv2_hdr *) pos; 4498d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 4508d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (resp->op_code == MSCHAPV2_OP_SUCCESS) { 4518d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Received Success Response" 4528d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt " - authentication completed successfully"); 4538d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->state = SUCCESS; 4548d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } else { 4558d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Did not receive Success " 4568d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt "Response - peer rejected authentication"); 4578d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->state = FAILURE; 4588d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 4598d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 4608d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 4618d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 4628d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic void eap_mschapv2_process_failure_resp(struct eap_sm *sm, 4638d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_mschapv2_data *data, 4648d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct wpabuf *respData) 4658d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 4668d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_mschapv2_hdr *resp; 4678d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt const u8 *pos; 4688d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt size_t len; 4698d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 4708d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_MSCHAPV2, respData, 4718d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt &len); 4728d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (pos == NULL || len < 1) 4738d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return; /* Should not happen - frame already validated */ 4748d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 4758d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt resp = (struct eap_mschapv2_hdr *) pos; 4768d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 4778d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (resp->op_code == MSCHAPV2_OP_FAILURE) { 4788d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Received Failure Response" 4798d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt " - authentication failed"); 4808d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } else { 4818d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Did not receive Failure " 4828d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt "Response - authentication failed"); 4838d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 4848d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 4858d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->state = FAILURE; 4868d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 4878d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 4888d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 4898d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic void eap_mschapv2_process(struct eap_sm *sm, void *priv, 4908d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct wpabuf *respData) 4918d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 4928d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_mschapv2_data *data = priv; 4938d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 4948d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (sm->user == NULL || sm->user->password == NULL) { 4958d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_INFO, "EAP-MSCHAPV2: Password not configured"); 4968d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt data->state = FAILURE; 4978d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return; 4988d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 4998d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 5008d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt switch (data->state) { 5018d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt case CHALLENGE: 5028d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt eap_mschapv2_process_response(sm, data, respData); 5038d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt break; 5048d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt case SUCCESS_REQ: 5058d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt eap_mschapv2_process_success_resp(sm, data, respData); 5068d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt break; 5078d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt case FAILURE_REQ: 5088d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt eap_mschapv2_process_failure_resp(sm, data, respData); 5098d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt break; 5108d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt default: 5118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Unknown state %d in " 5128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt "process", data->state); 5138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt break; 5148d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 5158d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 5168d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 5178d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 5188d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic Boolean eap_mschapv2_isDone(struct eap_sm *sm, void *priv) 5198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 5208d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_mschapv2_data *data = priv; 5218d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return data->state == SUCCESS || data->state == FAILURE; 5228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 5238d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 5248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 5258d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic u8 * eap_mschapv2_getKey(struct eap_sm *sm, void *priv, size_t *len) 5268d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 5278d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_mschapv2_data *data = priv; 5288d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 *key; 5298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 5308d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (data->state != SUCCESS || !data->master_key_valid) 5318d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return NULL; 5328d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 5338d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt *len = 2 * MSCHAPV2_KEY_LEN; 5348d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt key = os_malloc(*len); 5358d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (key == NULL) 5368d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return NULL; 5378d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt /* MSK = server MS-MPPE-Recv-Key | MS-MPPE-Send-Key */ 5388d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt get_asymetric_start_key(data->master_key, key, MSCHAPV2_KEY_LEN, 0, 1); 5398d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt get_asymetric_start_key(data->master_key, key + MSCHAPV2_KEY_LEN, 5408d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt MSCHAPV2_KEY_LEN, 1, 1); 5418d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_hexdump_key(MSG_DEBUG, "EAP-MSCHAPV2: Derived key", key, *len); 5428d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 5438d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return key; 5448d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 5458d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 5468d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 5478d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic Boolean eap_mschapv2_isSuccess(struct eap_sm *sm, void *priv) 5488d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 5498d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_mschapv2_data *data = priv; 5508d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return data->state == SUCCESS; 5518d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 5528d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 5538d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 5548d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtint eap_server_mschapv2_register(void) 5558d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 5568d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct eap_method *eap; 5578d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int ret; 5588d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 5598d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION, 5608d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt EAP_VENDOR_IETF, EAP_TYPE_MSCHAPV2, 5618d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt "MSCHAPV2"); 5628d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (eap == NULL) 5638d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return -1; 5648d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 5658d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt eap->init = eap_mschapv2_init; 5668d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt eap->reset = eap_mschapv2_reset; 5678d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt eap->buildReq = eap_mschapv2_buildReq; 5688d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt eap->check = eap_mschapv2_check; 5698d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt eap->process = eap_mschapv2_process; 5708d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt eap->isDone = eap_mschapv2_isDone; 5718d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt eap->getKey = eap_mschapv2_getKey; 5728d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt eap->isSuccess = eap_mschapv2_isSuccess; 5738d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 5748d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ret = eap_server_method_register(eap); 5758d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (ret) 5768d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt eap_server_method_free(eap); 5778d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return ret; 5788d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 579