000a1de72b
Changed peer to derive the full key (both MS-MPPE-Recv-Key and MS-MPPE-Send-Key for total of 32 octets) to match with server implementation. Swapped the order of MPPE keys in MSK derivation since server MS-MPPE-Recv-Key | MS-MPPE-Send-Key matches with the order specified for EAP-TLS MSK derivation. This means that PEAPv0 cryptobinding is now using EAP-MSCHAPv2 MSK as-is for ISK while EAP-FAST will need to swap the order of the MPPE keys to get ISK in a way that interoperates with Cisco EAP-FAST implementation.
568 lines
15 KiB
C
568 lines
15 KiB
C
/*
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* hostapd / EAP-MSCHAPv2 (draft-kamath-pppext-eap-mschapv2-00.txt) server
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* Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include "includes.h"
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#include "common.h"
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#include "eap_i.h"
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#include "ms_funcs.h"
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struct eap_mschapv2_hdr {
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u8 op_code; /* MSCHAPV2_OP_* */
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u8 mschapv2_id; /* must be changed for challenges, but not for
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* success/failure */
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u8 ms_length[2]; /* Note: misaligned; length - 5 */
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/* followed by data */
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} STRUCT_PACKED;
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#define MSCHAPV2_OP_CHALLENGE 1
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#define MSCHAPV2_OP_RESPONSE 2
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#define MSCHAPV2_OP_SUCCESS 3
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#define MSCHAPV2_OP_FAILURE 4
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#define MSCHAPV2_OP_CHANGE_PASSWORD 7
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#define MSCHAPV2_RESP_LEN 49
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#define ERROR_RESTRICTED_LOGON_HOURS 646
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#define ERROR_ACCT_DISABLED 647
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#define ERROR_PASSWD_EXPIRED 648
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#define ERROR_NO_DIALIN_PERMISSION 649
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#define ERROR_AUTHENTICATION_FAILURE 691
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#define ERROR_CHANGING_PASSWORD 709
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#define PASSWD_CHANGE_CHAL_LEN 16
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#define MSCHAPV2_KEY_LEN 16
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#define CHALLENGE_LEN 16
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struct eap_mschapv2_data {
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u8 auth_challenge[CHALLENGE_LEN];
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int auth_challenge_from_tls;
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u8 *peer_challenge;
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u8 auth_response[20];
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enum { CHALLENGE, SUCCESS_REQ, FAILURE_REQ, SUCCESS, FAILURE } state;
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u8 resp_mschapv2_id;
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u8 master_key[16];
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int master_key_valid;
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};
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static void * eap_mschapv2_init(struct eap_sm *sm)
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{
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struct eap_mschapv2_data *data;
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data = os_zalloc(sizeof(*data));
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if (data == NULL)
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return NULL;
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data->state = CHALLENGE;
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if (sm->auth_challenge) {
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os_memcpy(data->auth_challenge, sm->auth_challenge,
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CHALLENGE_LEN);
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data->auth_challenge_from_tls = 1;
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}
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if (sm->peer_challenge) {
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data->peer_challenge = os_malloc(CHALLENGE_LEN);
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if (data->peer_challenge == NULL) {
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os_free(data);
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return NULL;
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}
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os_memcpy(data->peer_challenge, sm->peer_challenge,
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CHALLENGE_LEN);
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}
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return data;
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}
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static void eap_mschapv2_reset(struct eap_sm *sm, void *priv)
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{
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struct eap_mschapv2_data *data = priv;
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if (data == NULL)
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return;
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os_free(data->peer_challenge);
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os_free(data);
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}
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static struct wpabuf * eap_mschapv2_build_challenge(
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struct eap_sm *sm, struct eap_mschapv2_data *data, u8 id)
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{
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struct wpabuf *req;
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struct eap_mschapv2_hdr *ms;
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char *name = "hostapd"; /* TODO: make this configurable */
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size_t ms_len;
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if (!data->auth_challenge_from_tls &&
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os_get_random(data->auth_challenge, CHALLENGE_LEN)) {
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wpa_printf(MSG_ERROR, "EAP-MSCHAPV2: Failed to get random "
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"data");
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data->state = FAILURE;
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return NULL;
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}
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ms_len = sizeof(*ms) + 1 + CHALLENGE_LEN + os_strlen(name);
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req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_MSCHAPV2, ms_len,
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EAP_CODE_REQUEST, id);
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if (req == NULL) {
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wpa_printf(MSG_ERROR, "EAP-MSCHAPV2: Failed to allocate memory"
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" for request");
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data->state = FAILURE;
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return NULL;
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}
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ms = wpabuf_put(req, sizeof(*ms));
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ms->op_code = MSCHAPV2_OP_CHALLENGE;
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ms->mschapv2_id = id;
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WPA_PUT_BE16(ms->ms_length, ms_len);
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wpabuf_put_u8(req, CHALLENGE_LEN);
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if (!data->auth_challenge_from_tls)
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wpabuf_put_data(req, data->auth_challenge, CHALLENGE_LEN);
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else
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wpabuf_put(req, CHALLENGE_LEN);
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wpa_hexdump(MSG_MSGDUMP, "EAP-MSCHAPV2: Challenge",
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data->auth_challenge, CHALLENGE_LEN);
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wpabuf_put_data(req, name, os_strlen(name));
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return req;
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}
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static struct wpabuf * eap_mschapv2_build_success_req(
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struct eap_sm *sm, struct eap_mschapv2_data *data, u8 id)
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{
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struct wpabuf *req;
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struct eap_mschapv2_hdr *ms;
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u8 *msg;
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char *message = "OK";
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size_t ms_len;
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ms_len = sizeof(*ms) + 2 + 2 * sizeof(data->auth_response) + 1 + 2 +
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os_strlen(message);
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req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_MSCHAPV2, ms_len,
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EAP_CODE_REQUEST, id);
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if (req == NULL) {
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wpa_printf(MSG_ERROR, "EAP-MSCHAPV2: Failed to allocate memory"
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" for request");
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data->state = FAILURE;
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return NULL;
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}
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ms = wpabuf_put(req, sizeof(*ms));
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ms->op_code = MSCHAPV2_OP_SUCCESS;
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ms->mschapv2_id = data->resp_mschapv2_id;
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WPA_PUT_BE16(ms->ms_length, ms_len);
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msg = (u8 *) (ms + 1);
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wpabuf_put_u8(req, 'S');
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wpabuf_put_u8(req, '=');
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wpa_snprintf_hex_uppercase(
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wpabuf_put(req, sizeof(data->auth_response) * 2),
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sizeof(data->auth_response) * 2 + 1,
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data->auth_response, sizeof(data->auth_response));
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wpabuf_put_u8(req, ' ');
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wpabuf_put_u8(req, 'M');
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wpabuf_put_u8(req, '=');
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wpabuf_put_data(req, message, os_strlen(message));
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wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-MSCHAPV2: Success Request Message",
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msg, ms_len - sizeof(*ms));
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return req;
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}
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static struct wpabuf * eap_mschapv2_build_failure_req(
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struct eap_sm *sm, struct eap_mschapv2_data *data, u8 id)
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{
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struct wpabuf *req;
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struct eap_mschapv2_hdr *ms;
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char *message = "E=691 R=0 C=00000000000000000000000000000000 V=3 "
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"M=FAILED";
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size_t ms_len;
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ms_len = sizeof(*ms) + os_strlen(message);
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req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_MSCHAPV2, ms_len,
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EAP_CODE_REQUEST, id);
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if (req == NULL) {
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wpa_printf(MSG_ERROR, "EAP-MSCHAPV2: Failed to allocate memory"
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" for request");
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data->state = FAILURE;
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return NULL;
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}
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ms = wpabuf_put(req, sizeof(*ms));
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ms->op_code = MSCHAPV2_OP_FAILURE;
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ms->mschapv2_id = data->resp_mschapv2_id;
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WPA_PUT_BE16(ms->ms_length, ms_len);
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wpabuf_put_data(req, message, os_strlen(message));
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wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-MSCHAPV2: Failure Request Message",
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(u8 *) message, os_strlen(message));
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return req;
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}
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static struct wpabuf * eap_mschapv2_buildReq(struct eap_sm *sm, void *priv,
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u8 id)
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{
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struct eap_mschapv2_data *data = priv;
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switch (data->state) {
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case CHALLENGE:
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return eap_mschapv2_build_challenge(sm, data, id);
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case SUCCESS_REQ:
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return eap_mschapv2_build_success_req(sm, data, id);
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case FAILURE_REQ:
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return eap_mschapv2_build_failure_req(sm, data, id);
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default:
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wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Unknown state %d in "
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"buildReq", data->state);
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break;
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}
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return NULL;
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}
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static Boolean eap_mschapv2_check(struct eap_sm *sm, void *priv,
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struct wpabuf *respData)
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{
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struct eap_mschapv2_data *data = priv;
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struct eap_mschapv2_hdr *resp;
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const u8 *pos;
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size_t len;
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pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_MSCHAPV2, respData,
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&len);
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if (pos == NULL || len < 1) {
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wpa_printf(MSG_INFO, "EAP-MSCHAPV2: Invalid frame");
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return TRUE;
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}
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resp = (struct eap_mschapv2_hdr *) pos;
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if (data->state == CHALLENGE &&
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resp->op_code != MSCHAPV2_OP_RESPONSE) {
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wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Expected Response - "
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"ignore op %d", resp->op_code);
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return TRUE;
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}
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if (data->state == SUCCESS_REQ &&
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resp->op_code != MSCHAPV2_OP_SUCCESS &&
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resp->op_code != MSCHAPV2_OP_FAILURE) {
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wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Expected Success or "
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"Failure - ignore op %d", resp->op_code);
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return TRUE;
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}
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if (data->state == FAILURE_REQ &&
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resp->op_code != MSCHAPV2_OP_FAILURE) {
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wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Expected Failure "
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"- ignore op %d", resp->op_code);
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return TRUE;
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}
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return FALSE;
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}
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static void eap_mschapv2_process_response(struct eap_sm *sm,
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struct eap_mschapv2_data *data,
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struct wpabuf *respData)
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{
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struct eap_mschapv2_hdr *resp;
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const u8 *pos, *end, *peer_challenge, *nt_response, *name;
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u8 flags;
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size_t len, name_len, i;
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u8 expected[24];
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const u8 *username, *user;
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size_t username_len, user_len;
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pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_MSCHAPV2, respData,
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&len);
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if (pos == NULL || len < 1)
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return; /* Should not happen - frame already validated */
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end = pos + len;
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resp = (struct eap_mschapv2_hdr *) pos;
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pos = (u8 *) (resp + 1);
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if (len < sizeof(*resp) + 1 + 49 ||
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resp->op_code != MSCHAPV2_OP_RESPONSE ||
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pos[0] != 49) {
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wpa_hexdump_buf(MSG_DEBUG, "EAP-MSCHAPV2: Invalid response",
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respData);
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data->state = FAILURE;
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return;
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}
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data->resp_mschapv2_id = resp->mschapv2_id;
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pos++;
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peer_challenge = pos;
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pos += 16 + 8;
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nt_response = pos;
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pos += 24;
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flags = *pos++;
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name = pos;
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name_len = end - name;
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if (data->peer_challenge) {
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wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Using pre-configured "
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"Peer-Challenge");
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peer_challenge = data->peer_challenge;
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}
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wpa_hexdump(MSG_MSGDUMP, "EAP-MSCHAPV2: Peer-Challenge",
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peer_challenge, 16);
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wpa_hexdump(MSG_MSGDUMP, "EAP-MSCHAPV2: NT-Response", nt_response, 24);
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wpa_printf(MSG_MSGDUMP, "EAP-MSCHAPV2: Flags 0x%x", flags);
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wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-MSCHAPV2: Name", name, name_len);
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/* MSCHAPv2 does not include optional domain name in the
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* challenge-response calculation, so remove domain prefix
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* (if present). */
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username = sm->identity;
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username_len = sm->identity_len;
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for (i = 0; i < username_len; i++) {
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if (username[i] == '\\') {
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username_len -= i + 1;
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username += i + 1;
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break;
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}
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}
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user = name;
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user_len = name_len;
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for (i = 0; i < user_len; i++) {
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if (user[i] == '\\') {
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user_len -= i + 1;
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user += i + 1;
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break;
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}
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}
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if (username_len != user_len ||
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os_memcmp(username, user, username_len) != 0) {
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wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Mismatch in user names");
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wpa_hexdump_ascii(MSG_DEBUG, "EAP-MSCHAPV2: Expected user "
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"name", username, username_len);
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wpa_hexdump_ascii(MSG_DEBUG, "EAP-MSCHAPV2: Received user "
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"name", user, user_len);
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data->state = FAILURE;
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return;
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}
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wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-MSCHAPV2: User name",
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username, username_len);
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if (sm->user->password_hash) {
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generate_nt_response_pwhash(data->auth_challenge,
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peer_challenge,
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username, username_len,
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sm->user->password,
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expected);
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} else {
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generate_nt_response(data->auth_challenge, peer_challenge,
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username, username_len,
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sm->user->password,
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sm->user->password_len,
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expected);
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}
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if (os_memcmp(nt_response, expected, 24) == 0) {
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const u8 *pw_hash;
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u8 pw_hash_buf[16], pw_hash_hash[16];
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wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Correct NT-Response");
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data->state = SUCCESS_REQ;
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/* Authenticator response is not really needed yet, but
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* calculate it here so that peer_challenge and username need
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* not be saved. */
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if (sm->user->password_hash) {
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pw_hash = sm->user->password;
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} else {
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nt_password_hash(sm->user->password,
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sm->user->password_len,
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pw_hash_buf);
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pw_hash = pw_hash_buf;
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}
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generate_authenticator_response_pwhash(
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pw_hash, peer_challenge, data->auth_challenge,
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username, username_len, nt_response,
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data->auth_response);
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hash_nt_password_hash(pw_hash, pw_hash_hash);
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get_master_key(pw_hash_hash, nt_response, data->master_key);
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data->master_key_valid = 1;
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wpa_hexdump_key(MSG_DEBUG, "EAP-MSCHAPV2: Derived Master Key",
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data->master_key, MSCHAPV2_KEY_LEN);
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} else {
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wpa_hexdump(MSG_MSGDUMP, "EAP-MSCHAPV2: Expected NT-Response",
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expected, 24);
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wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Invalid NT-Response");
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data->state = FAILURE_REQ;
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}
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}
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static void eap_mschapv2_process_success_resp(struct eap_sm *sm,
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struct eap_mschapv2_data *data,
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struct wpabuf *respData)
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{
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struct eap_mschapv2_hdr *resp;
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const u8 *pos;
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size_t len;
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pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_MSCHAPV2, respData,
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&len);
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if (pos == NULL || len < 1)
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return; /* Should not happen - frame already validated */
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resp = (struct eap_mschapv2_hdr *) pos;
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if (resp->op_code == MSCHAPV2_OP_SUCCESS) {
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wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Received Success Response"
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" - authentication completed successfully");
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data->state = SUCCESS;
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} else {
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wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Did not receive Success "
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"Response - peer rejected authentication");
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data->state = FAILURE;
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}
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}
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static void eap_mschapv2_process_failure_resp(struct eap_sm *sm,
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struct eap_mschapv2_data *data,
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struct wpabuf *respData)
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{
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struct eap_mschapv2_hdr *resp;
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const u8 *pos;
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size_t len;
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pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_MSCHAPV2, respData,
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&len);
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if (pos == NULL || len < 1)
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return; /* Should not happen - frame already validated */
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resp = (struct eap_mschapv2_hdr *) pos;
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if (resp->op_code == MSCHAPV2_OP_FAILURE) {
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wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Received Failure Response"
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" - authentication failed");
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} else {
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wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Did not receive Failure "
|
|
"Response - authentication failed");
|
|
}
|
|
|
|
data->state = FAILURE;
|
|
}
|
|
|
|
|
|
static void eap_mschapv2_process(struct eap_sm *sm, void *priv,
|
|
struct wpabuf *respData)
|
|
{
|
|
struct eap_mschapv2_data *data = priv;
|
|
|
|
if (sm->user == NULL || sm->user->password == NULL) {
|
|
wpa_printf(MSG_INFO, "EAP-MSCHAPV2: Password not configured");
|
|
data->state = FAILURE;
|
|
return;
|
|
}
|
|
|
|
switch (data->state) {
|
|
case CHALLENGE:
|
|
eap_mschapv2_process_response(sm, data, respData);
|
|
break;
|
|
case SUCCESS_REQ:
|
|
eap_mschapv2_process_success_resp(sm, data, respData);
|
|
break;
|
|
case FAILURE_REQ:
|
|
eap_mschapv2_process_failure_resp(sm, data, respData);
|
|
break;
|
|
default:
|
|
wpa_printf(MSG_DEBUG, "EAP-MSCHAPV2: Unknown state %d in "
|
|
"process", data->state);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
static Boolean eap_mschapv2_isDone(struct eap_sm *sm, void *priv)
|
|
{
|
|
struct eap_mschapv2_data *data = priv;
|
|
return data->state == SUCCESS || data->state == FAILURE;
|
|
}
|
|
|
|
|
|
static u8 * eap_mschapv2_getKey(struct eap_sm *sm, void *priv, size_t *len)
|
|
{
|
|
struct eap_mschapv2_data *data = priv;
|
|
u8 *key;
|
|
|
|
if (data->state != SUCCESS || !data->master_key_valid)
|
|
return NULL;
|
|
|
|
*len = 2 * MSCHAPV2_KEY_LEN;
|
|
key = os_malloc(*len);
|
|
if (key == NULL)
|
|
return NULL;
|
|
/* MSK = server MS-MPPE-Recv-Key | MS-MPPE-Send-Key */
|
|
get_asymetric_start_key(data->master_key, key, MSCHAPV2_KEY_LEN, 0, 1);
|
|
get_asymetric_start_key(data->master_key, key + MSCHAPV2_KEY_LEN,
|
|
MSCHAPV2_KEY_LEN, 1, 1);
|
|
wpa_hexdump_key(MSG_DEBUG, "EAP-MSCHAPV2: Derived key", key, *len);
|
|
|
|
return key;
|
|
}
|
|
|
|
|
|
static Boolean eap_mschapv2_isSuccess(struct eap_sm *sm, void *priv)
|
|
{
|
|
struct eap_mschapv2_data *data = priv;
|
|
return data->state == SUCCESS;
|
|
}
|
|
|
|
|
|
int eap_server_mschapv2_register(void)
|
|
{
|
|
struct eap_method *eap;
|
|
int ret;
|
|
|
|
eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
|
|
EAP_VENDOR_IETF, EAP_TYPE_MSCHAPV2,
|
|
"MSCHAPV2");
|
|
if (eap == NULL)
|
|
return -1;
|
|
|
|
eap->init = eap_mschapv2_init;
|
|
eap->reset = eap_mschapv2_reset;
|
|
eap->buildReq = eap_mschapv2_buildReq;
|
|
eap->check = eap_mschapv2_check;
|
|
eap->process = eap_mschapv2_process;
|
|
eap->isDone = eap_mschapv2_isDone;
|
|
eap->getKey = eap_mschapv2_getKey;
|
|
eap->isSuccess = eap_mschapv2_isSuccess;
|
|
|
|
ret = eap_server_method_register(eap);
|
|
if (ret)
|
|
eap_server_method_free(eap);
|
|
return ret;
|
|
}
|