133 lines
3.2 KiB
C
133 lines
3.2 KiB
C
/*
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* EAP peer method: EAP-MD5 (RFC 3748 and RFC 1994)
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* Copyright (c) 2004-2006, 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 "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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/* No need for private data. However, must return non-NULL to indicate
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* success. */
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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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const struct eap_hdr *req;
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struct eap_hdr *resp;
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const u8 *pos, *challenge, *password;
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u8 *rpos;
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size_t len, challenge_len, password_len;
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const u8 *addr[3];
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size_t elen[3];
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password = eap_get_config_password(sm, &password_len);
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if (password == NULL) {
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wpa_printf(MSG_INFO, "EAP-MD5: Password not configured");
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eap_sm_request_password(sm);
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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_VENDOR_IETF, EAP_TYPE_MD5,
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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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/*
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* CHAP Challenge:
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* Value-Size (1 octet) | Value(Challenge) | Name(optional)
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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 || challenge_len > len - 1) {
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wpa_printf(MSG_INFO, "EAP-MD5: Invalid challenge "
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"(challenge_len=%lu len=%lu)",
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(unsigned long) 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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resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_MD5, respDataLen,
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1 + MD5_MAC_LEN, EAP_CODE_RESPONSE,
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req->identifier, &rpos);
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if (resp == NULL)
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return NULL;
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/*
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* CHAP Response:
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* Value-Size (1 octet) | Value(Response) | Name(optional)
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*/
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*rpos++ = MD5_MAC_LEN;
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addr[0] = &resp->identifier;
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elen[0] = 1;
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addr[1] = password;
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elen[1] = 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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int eap_peer_md5_register(void)
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{
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struct eap_method *eap;
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int ret;
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eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
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EAP_VENDOR_IETF, EAP_TYPE_MD5, "MD5");
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if (eap == NULL)
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return -1;
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eap->init = eap_md5_init;
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eap->deinit = eap_md5_deinit;
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eap->process = eap_md5_process;
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ret = eap_peer_method_register(eap);
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if (ret)
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eap_peer_method_free(eap);
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return ret;
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}
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