/*
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* EAP peer method: EAP-MD5 (RFC 3748 and RFC 1994)
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* Copyright (c) 2004-2012, Jouni Malinen <j@w1.fi>
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*
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* This software may be distributed under the terms of the BSD license.
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* See README 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 "eap_common/chap.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 struct wpabuf * eap_md5_process(struct eap_sm *sm, void *priv,
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struct eap_method_ret *ret,
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const struct wpabuf *reqData)
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{
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struct wpabuf *resp;
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const u8 *pos, *challenge, *password;
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u8 *rpos, id;
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size_t len, challenge_len, password_len;
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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, reqData, &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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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_COND_SUCC;
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ret->allowNotifications = TRUE;
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resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_MD5, 1 + CHAP_MD5_LEN,
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EAP_CODE_RESPONSE, eap_get_id(reqData));
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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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wpabuf_put_u8(resp, CHAP_MD5_LEN);
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id = eap_get_id(resp);
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rpos = wpabuf_put(resp, CHAP_MD5_LEN);
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if (chap_md5(id, password, password_len, challenge, challenge_len,
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rpos)) {
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wpa_printf(MSG_INFO, "EAP-MD5: CHAP MD5 operation failed");
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ret->ignore = TRUE;
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wpabuf_free(resp);
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return NULL;
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}
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wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Response", rpos, CHAP_MD5_LEN);
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return 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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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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return eap_peer_method_register(eap);
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}
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