2 * hostapd / EAP-MD5 server
3 * Copyright (c) 2004-2012, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
12 #include "crypto/random.h"
14 #include "eap_common/chap.h"
17 #define CHALLENGE_LEN 16
20 u8 challenge[CHALLENGE_LEN];
21 enum { CONTINUE, SUCCESS, FAILURE } state;
25 static void * eap_md5_init(struct eap_sm *sm)
27 struct eap_md5_data *data;
29 data = os_zalloc(sizeof(*data));
32 data->state = CONTINUE;
38 static void eap_md5_reset(struct eap_sm *sm, void *priv)
40 struct eap_md5_data *data = priv;
45 static struct wpabuf * eap_md5_buildReq(struct eap_sm *sm, void *priv, u8 id)
47 struct eap_md5_data *data = priv;
50 if (random_get_bytes(data->challenge, CHALLENGE_LEN)) {
51 wpa_printf(MSG_ERROR, "EAP-MD5: Failed to get random data");
52 data->state = FAILURE;
56 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_MD5, 1 + CHALLENGE_LEN,
57 EAP_CODE_REQUEST, id);
59 wpa_printf(MSG_ERROR, "EAP-MD5: Failed to allocate memory for "
61 data->state = FAILURE;
65 wpabuf_put_u8(req, CHALLENGE_LEN);
66 wpabuf_put_data(req, data->challenge, CHALLENGE_LEN);
67 wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Challenge", data->challenge,
70 data->state = CONTINUE;
76 static Boolean eap_md5_check(struct eap_sm *sm, void *priv,
77 struct wpabuf *respData)
82 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_MD5, respData, &len);
83 if (pos == NULL || len < 1) {
84 wpa_printf(MSG_INFO, "EAP-MD5: Invalid frame");
87 if (*pos != CHAP_MD5_LEN || 1 + CHAP_MD5_LEN > len) {
88 wpa_printf(MSG_INFO, "EAP-MD5: Invalid response "
89 "(response_len=%d payload_len=%lu",
90 *pos, (unsigned long) len);
98 static void eap_md5_process(struct eap_sm *sm, void *priv,
99 struct wpabuf *respData)
101 struct eap_md5_data *data = priv;
104 u8 hash[CHAP_MD5_LEN], id;
106 if (sm->user == NULL || sm->user->password == NULL ||
107 sm->user->password_hash) {
108 wpa_printf(MSG_INFO, "EAP-MD5: Plaintext password not "
110 data->state = FAILURE;
114 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_MD5, respData, &plen);
115 if (pos == NULL || *pos != CHAP_MD5_LEN || plen < 1 + CHAP_MD5_LEN)
116 return; /* Should not happen - frame already validated */
118 pos++; /* Skip response len */
119 wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Response", pos, CHAP_MD5_LEN);
121 id = eap_get_id(respData);
122 if (chap_md5(id, sm->user->password, sm->user->password_len,
123 data->challenge, CHALLENGE_LEN, hash)) {
124 wpa_printf(MSG_INFO, "EAP-MD5: CHAP MD5 operation failed");
125 data->state = FAILURE;
129 if (os_memcmp(hash, pos, CHAP_MD5_LEN) == 0) {
130 wpa_printf(MSG_DEBUG, "EAP-MD5: Done - Success");
131 data->state = SUCCESS;
133 wpa_printf(MSG_DEBUG, "EAP-MD5: Done - Failure");
134 data->state = FAILURE;
139 static Boolean eap_md5_isDone(struct eap_sm *sm, void *priv)
141 struct eap_md5_data *data = priv;
142 return data->state != CONTINUE;
146 static Boolean eap_md5_isSuccess(struct eap_sm *sm, void *priv)
148 struct eap_md5_data *data = priv;
149 return data->state == SUCCESS;
153 int eap_server_md5_register(void)
155 struct eap_method *eap;
158 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
159 EAP_VENDOR_IETF, EAP_TYPE_MD5, "MD5");
163 eap->init = eap_md5_init;
164 eap->reset = eap_md5_reset;
165 eap->buildReq = eap_md5_buildReq;
166 eap->check = eap_md5_check;
167 eap->process = eap_md5_process;
168 eap->isDone = eap_md5_isDone;
169 eap->isSuccess = eap_md5_isSuccess;
171 ret = eap_server_method_register(eap);
173 eap_server_method_free(eap);