static void eap_md5_process(struct eap_sm *sm, void *priv,
struct wpabuf *respData)
{
struct eap_md5_data *data = priv;
const u8 *pos;
size_t plen;
u8 hash[CHAP_MD5_LEN], id;
if (sm->user == NULL || sm->user->password == NULL ||
sm->user->password_hash) {
wpa_printf(MSG_INFO, "EAP-MD5: Plaintext password not "
"configured");
data->state = FAILURE;
return;
}
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_MD5, respData, &plen);
if (pos == NULL || *pos != CHAP_MD5_LEN || plen < 1 + CHAP_MD5_LEN)
return; /* Should not happen - frame already validated */
pos++; /* Skip response len */
wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Response", pos, CHAP_MD5_LEN);
id = eap_get_id(respData);
chap_md5(id, sm->user->password, sm->user->password_len,
data->challenge, CHALLENGE_LEN, hash);
if (os_memcmp(hash, pos, CHAP_MD5_LEN) == 0) {
wpa_printf(MSG_DEBUG, "EAP-MD5: Done - Success");
data->state = SUCCESS;
} else {
wpa_printf(MSG_DEBUG, "EAP-MD5: Done - Failure");
data->state = FAILURE;
}
}
static struct wpabuf * eap_md5_process(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
const struct wpabuf *reqData)
{
struct wpabuf *resp;
const u8 *pos, *challenge, *password;
u8 *rpos, id;
size_t len, challenge_len, password_len;
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, &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)
*/
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_COND_SUCC;
ret->allowNotifications = TRUE;
resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_MD5, 1 + CHAP_MD5_LEN,
EAP_CODE_RESPONSE, eap_get_id(reqData));
if (resp == NULL)
return NULL;
/*
* CHAP Response:
* Value-Size (1 octet) | Value(Response) | Name(optional)
*/
wpabuf_put_u8(resp, CHAP_MD5_LEN);
id = eap_get_id(resp);
rpos = wpabuf_put(resp, CHAP_MD5_LEN);
chap_md5(id, password, password_len, challenge, challenge_len, rpos);
wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Response", rpos, CHAP_MD5_LEN);
return resp;
}
