1 /*
2 * EAP peer method: EAP-OTP (RFC 3748)
3 * Copyright (c) 2004-2006, 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 "eap_i.h"
13
14
eap_otp_init(struct eap_sm * sm)15 static void * eap_otp_init(struct eap_sm *sm)
16 {
17 /* No need for private data. However, must return non-NULL to indicate
18 * success. */
19 return (void *) 1;
20 }
21
22
eap_otp_deinit(struct eap_sm * sm,void * priv)23 static void eap_otp_deinit(struct eap_sm *sm, void *priv)
24 {
25 }
26
27
eap_otp_process(struct eap_sm * sm,void * priv,struct eap_method_ret * ret,const struct wpabuf * reqData)28 static struct wpabuf * eap_otp_process(struct eap_sm *sm, void *priv,
29 struct eap_method_ret *ret,
30 const struct wpabuf *reqData)
31 {
32 struct wpabuf *resp;
33 const u8 *pos, *password;
34 size_t password_len, len;
35 int otp;
36
37 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_OTP, reqData, &len);
38 if (pos == NULL) {
39 ret->ignore = true;
40 return NULL;
41 }
42 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-OTP: Request message",
43 pos, len);
44
45 password = eap_get_config_otp(sm, &password_len);
46 if (password)
47 otp = 1;
48 else {
49 password = eap_get_config_password(sm, &password_len);
50 otp = 0;
51 }
52
53 if (password == NULL) {
54 wpa_printf(MSG_INFO, "EAP-OTP: Password not configured");
55 eap_sm_request_otp(sm, (const char *) pos, len);
56 ret->ignore = true;
57 return NULL;
58 }
59
60 ret->ignore = false;
61
62 ret->methodState = METHOD_DONE;
63 ret->decision = DECISION_COND_SUCC;
64 ret->allowNotifications = false;
65
66 resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_OTP, password_len,
67 EAP_CODE_RESPONSE, eap_get_id(reqData));
68 if (resp == NULL)
69 return NULL;
70 wpabuf_put_data(resp, password, password_len);
71 wpa_hexdump_ascii_key(MSG_MSGDUMP, "EAP-OTP: Response",
72 password, password_len);
73
74 if (otp) {
75 wpa_printf(MSG_DEBUG, "EAP-OTP: Forgetting used password");
76 eap_clear_config_otp(sm);
77 }
78
79 return resp;
80 }
81
82
eap_peer_otp_register(void)83 int eap_peer_otp_register(void)
84 {
85 struct eap_method *eap;
86
87 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
88 EAP_VENDOR_IETF, EAP_TYPE_OTP, "OTP");
89 if (eap == NULL)
90 return -1;
91
92 eap->init = eap_otp_init;
93 eap->deinit = eap_otp_deinit;
94 eap->process = eap_otp_process;
95
96 return eap_peer_method_register(eap);
97 }
98
