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/*
* EAP peer method: EAP-MD5 (RFC 3748 and RFC 1994)
* Copyright (c) 2004-2006, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include "includes.h"
#include "common.h"
#include "eap_i.h"
#include "md5.h"
#include "crypto.h"
static void * eap_md5_init(struct eap_sm *sm)
{
/* No need for private data. However, must return non-NULL to indicate
* success. */
return (void *) 1;
}
static void eap_md5_deinit(struct eap_sm *sm, void *priv)
{
}
static u8 * eap_md5_process(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
const u8 *reqData, size_t reqDataLen,
size_t *respDataLen)
{
const struct eap_hdr *req;
struct eap_hdr *resp;
const u8 *pos, *challenge, *password;
u8 *rpos;
size_t len, challenge_len, password_len;
const u8 *addr[3];
size_t elen[3];
password = eap_get_config_password(sm, &password_len);
if (password == NULL) {
wpa_printf(MSG_INFO, "EAP-MD5: Password not configured");
eap_sm_request_password(sm);
ret->ignore = TRUE;
return NULL;
}
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_MD5,
reqData, reqDataLen, &len);
if (pos == NULL || len == 0) {
wpa_printf(MSG_INFO, "EAP-MD5: Invalid frame (pos=%p len=%lu)",
pos, (unsigned long) len);
ret->ignore = TRUE;
return NULL;
}
/*
* CHAP Challenge:
* Value-Size (1 octet) | Value(Challenge) | Name(optional)
*/
req = (const struct eap_hdr *) reqData;
challenge_len = *pos++;
if (challenge_len == 0 || challenge_len > len - 1) {
wpa_printf(MSG_INFO, "EAP-MD5: Invalid challenge "
"(challenge_len=%lu len=%lu)",
(unsigned long) challenge_len, (unsigned long) len);
ret->ignore = TRUE;
return NULL;
}
ret->ignore = FALSE;
challenge = pos;
wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Challenge",
challenge, challenge_len);
wpa_printf(MSG_DEBUG, "EAP-MD5: Generating Challenge Response");
ret->methodState = METHOD_DONE;
ret->decision = DECISION_UNCOND_SUCC;
ret->allowNotifications = TRUE;
resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_MD5, respDataLen,
1 + MD5_MAC_LEN, EAP_CODE_RESPONSE,
req->identifier, &rpos);
if (resp == NULL)
return NULL;
/*
* CHAP Response:
* Value-Size (1 octet) | Value(Response) | Name(optional)
*/
*rpos++ = MD5_MAC_LEN;
addr[0] = &resp->identifier;
elen[0] = 1;
addr[1] = password;
elen[1] = password_len;
addr[2] = challenge;
elen[2] = challenge_len;
md5_vector(3, addr, elen, rpos);
wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Response", rpos, MD5_MAC_LEN);
return (u8 *) resp;
}
int eap_peer_md5_register(void)
{
struct eap_method *eap;
int ret;
eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
EAP_VENDOR_IETF, EAP_TYPE_MD5, "MD5");
if (eap == NULL)
return -1;
eap->init = eap_md5_init;
eap->deinit = eap_md5_deinit;
eap->process = eap_md5_process;
ret = eap_peer_method_register(eap);
if (ret)
eap_peer_method_free(eap);
return ret;
}
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