118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
/*
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* WPA Supplicant / EAP-MD5
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* Copyright (c) 2004-2005, Jouni Malinen <jkmaline@cc.hut.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 <stdlib.h>
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#include <stdio.h>
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#include "common.h"
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#include "eap_i.h"
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#include "wpa_supplicant.h"
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#include "config_ssid.h"
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#include "md5.h"
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#include "crypto.h"
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static void * eap_md5_init(struct eap_sm *sm)
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{
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return (void *) 1;
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}
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static void eap_md5_deinit(struct eap_sm *sm, void *priv)
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{
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}
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static u8 * eap_md5_process(struct eap_sm *sm, void *priv,
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struct eap_method_ret *ret,
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const u8 *reqData, size_t reqDataLen,
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size_t *respDataLen)
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{
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struct wpa_ssid *config = eap_get_config(sm);
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const struct eap_hdr *req;
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struct eap_hdr *resp;
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const u8 *pos, *challenge;
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u8 *rpos;
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int challenge_len;
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size_t len;
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const u8 *addr[3];
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size_t elen[3];
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if (config == NULL || config->password == NULL) {
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wpa_printf(MSG_INFO, "EAP-MD5: Password not configured");
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eap_sm_request_password(sm, config);
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ret->ignore = TRUE;
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return NULL;
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}
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pos = eap_hdr_validate(EAP_TYPE_MD5, reqData, reqDataLen, &len);
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if (pos == NULL || len == 0) {
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wpa_printf(MSG_INFO, "EAP-MD5: Invalid frame (pos=%p len=%lu)",
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pos, (unsigned long) len);
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ret->ignore = TRUE;
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return NULL;
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}
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req = (const struct eap_hdr *) reqData;
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challenge_len = *pos++;
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if (challenge_len == 0 ||
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challenge_len > len - 1) {
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wpa_printf(MSG_INFO, "EAP-MD5: Invalid challenge "
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"(challenge_len=%d len=%lu)",
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challenge_len, (unsigned long) len);
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ret->ignore = TRUE;
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return NULL;
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}
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ret->ignore = FALSE;
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challenge = pos;
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wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Challenge",
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challenge, challenge_len);
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wpa_printf(MSG_DEBUG, "EAP-MD5: generating Challenge Response");
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ret->methodState = METHOD_DONE;
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ret->decision = DECISION_UNCOND_SUCC;
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ret->allowNotifications = TRUE;
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*respDataLen = sizeof(struct eap_hdr) + 1 + 1 + MD5_MAC_LEN;
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resp = malloc(*respDataLen);
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if (resp == NULL)
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return NULL;
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resp->code = EAP_CODE_RESPONSE;
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resp->identifier = req->identifier;
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resp->length = host_to_be16(*respDataLen);
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rpos = (u8 *) (resp + 1);
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*rpos++ = EAP_TYPE_MD5;
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*rpos++ = MD5_MAC_LEN; /* Value-Size */
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addr[0] = &resp->identifier;
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elen[0] = 1;
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addr[1] = config->password;
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elen[1] = config->password_len;
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addr[2] = challenge;
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elen[2] = challenge_len;
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md5_vector(3, addr, elen, rpos);
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wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Response", rpos, MD5_MAC_LEN);
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return (u8 *) resp;
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}
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const struct eap_method eap_method_md5 =
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{
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.method = EAP_TYPE_MD5,
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.name = "MD5",
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.init = eap_md5_init,
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.deinit = eap_md5_deinit,
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.process = eap_md5_process,
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};
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