Line data Source code
1 : /*
2 : * hostapd / EAP-MD5 server
3 : * Copyright (c) 2004-2012, Jouni Malinen <j@w1.fi>
4 : *
5 : * This software may be distributed under the terms of the BSD license.
6 : * See README for more details.
7 : */
8 :
9 : #include "includes.h"
10 :
11 : #include "common.h"
12 : #include "crypto/random.h"
13 : #include "eap_i.h"
14 : #include "eap_common/chap.h"
15 :
16 :
17 : #define CHALLENGE_LEN 16
18 :
19 : struct eap_md5_data {
20 : u8 challenge[CHALLENGE_LEN];
21 : enum { CONTINUE, SUCCESS, FAILURE } state;
22 : };
23 :
24 :
25 7 : static void * eap_md5_init(struct eap_sm *sm)
26 : {
27 : struct eap_md5_data *data;
28 :
29 7 : data = os_zalloc(sizeof(*data));
30 7 : if (data == NULL)
31 1 : return NULL;
32 6 : data->state = CONTINUE;
33 :
34 6 : return data;
35 : }
36 :
37 :
38 6 : static void eap_md5_reset(struct eap_sm *sm, void *priv)
39 : {
40 6 : struct eap_md5_data *data = priv;
41 6 : os_free(data);
42 6 : }
43 :
44 :
45 6 : static struct wpabuf * eap_md5_buildReq(struct eap_sm *sm, void *priv, u8 id)
46 : {
47 6 : struct eap_md5_data *data = priv;
48 : struct wpabuf *req;
49 :
50 6 : if (random_get_bytes(data->challenge, CHALLENGE_LEN)) {
51 0 : wpa_printf(MSG_ERROR, "EAP-MD5: Failed to get random data");
52 0 : data->state = FAILURE;
53 0 : return NULL;
54 : }
55 :
56 6 : req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_MD5, 1 + CHALLENGE_LEN,
57 : EAP_CODE_REQUEST, id);
58 6 : if (req == NULL) {
59 1 : wpa_printf(MSG_ERROR, "EAP-MD5: Failed to allocate memory for "
60 : "request");
61 1 : data->state = FAILURE;
62 1 : return NULL;
63 : }
64 :
65 5 : wpabuf_put_u8(req, CHALLENGE_LEN);
66 5 : wpabuf_put_data(req, data->challenge, CHALLENGE_LEN);
67 5 : wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Challenge", data->challenge,
68 : CHALLENGE_LEN);
69 :
70 5 : data->state = CONTINUE;
71 :
72 5 : return req;
73 : }
74 :
75 :
76 5 : static Boolean eap_md5_check(struct eap_sm *sm, void *priv,
77 : struct wpabuf *respData)
78 : {
79 : const u8 *pos;
80 : size_t len;
81 :
82 5 : pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_MD5, respData, &len);
83 5 : if (pos == NULL || len < 1) {
84 0 : wpa_printf(MSG_INFO, "EAP-MD5: Invalid frame");
85 0 : return TRUE;
86 : }
87 5 : if (*pos != CHAP_MD5_LEN || 1 + CHAP_MD5_LEN > len) {
88 0 : wpa_printf(MSG_INFO, "EAP-MD5: Invalid response "
89 : "(response_len=%d payload_len=%lu",
90 0 : *pos, (unsigned long) len);
91 0 : return TRUE;
92 : }
93 :
94 5 : return FALSE;
95 : }
96 :
97 :
98 5 : static void eap_md5_process(struct eap_sm *sm, void *priv,
99 : struct wpabuf *respData)
100 : {
101 5 : struct eap_md5_data *data = priv;
102 : const u8 *pos;
103 : size_t plen;
104 : u8 hash[CHAP_MD5_LEN], id;
105 :
106 9 : if (sm->user == NULL || sm->user->password == NULL ||
107 4 : sm->user->password_hash) {
108 1 : wpa_printf(MSG_INFO, "EAP-MD5: Plaintext password not "
109 : "configured");
110 1 : data->state = FAILURE;
111 2 : return;
112 : }
113 :
114 4 : pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_MD5, respData, &plen);
115 4 : if (pos == NULL || *pos != CHAP_MD5_LEN || plen < 1 + CHAP_MD5_LEN)
116 0 : return; /* Should not happen - frame already validated */
117 :
118 4 : pos++; /* Skip response len */
119 4 : wpa_hexdump(MSG_MSGDUMP, "EAP-MD5: Response", pos, CHAP_MD5_LEN);
120 :
121 4 : id = eap_get_id(respData);
122 4 : if (chap_md5(id, sm->user->password, sm->user->password_len,
123 4 : data->challenge, CHALLENGE_LEN, hash)) {
124 0 : wpa_printf(MSG_INFO, "EAP-MD5: CHAP MD5 operation failed");
125 0 : data->state = FAILURE;
126 0 : return;
127 : }
128 :
129 4 : if (os_memcmp_const(hash, pos, CHAP_MD5_LEN) == 0) {
130 3 : wpa_printf(MSG_DEBUG, "EAP-MD5: Done - Success");
131 3 : data->state = SUCCESS;
132 : } else {
133 1 : wpa_printf(MSG_DEBUG, "EAP-MD5: Done - Failure");
134 1 : data->state = FAILURE;
135 : }
136 : }
137 :
138 :
139 5 : static Boolean eap_md5_isDone(struct eap_sm *sm, void *priv)
140 : {
141 5 : struct eap_md5_data *data = priv;
142 5 : return data->state != CONTINUE;
143 : }
144 :
145 :
146 5 : static Boolean eap_md5_isSuccess(struct eap_sm *sm, void *priv)
147 : {
148 5 : struct eap_md5_data *data = priv;
149 5 : return data->state == SUCCESS;
150 : }
151 :
152 :
153 10 : int eap_server_md5_register(void)
154 : {
155 : struct eap_method *eap;
156 : int ret;
157 :
158 10 : eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
159 : EAP_VENDOR_IETF, EAP_TYPE_MD5, "MD5");
160 10 : if (eap == NULL)
161 0 : return -1;
162 :
163 10 : eap->init = eap_md5_init;
164 10 : eap->reset = eap_md5_reset;
165 10 : eap->buildReq = eap_md5_buildReq;
166 10 : eap->check = eap_md5_check;
167 10 : eap->process = eap_md5_process;
168 10 : eap->isDone = eap_md5_isDone;
169 10 : eap->isSuccess = eap_md5_isSuccess;
170 :
171 10 : ret = eap_server_method_register(eap);
172 10 : if (ret)
173 0 : eap_server_method_free(eap);
174 10 : return ret;
175 : }
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