1 /*
2  * External password backend
3  * Copyright (c) 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 #ifdef __linux__
12 #include <sys/mman.h>
13 #endif /* __linux__ */
14 
15 #include "common.h"
16 #include "ext_password_i.h"
17 
18 
19 static const struct ext_password_backend *backends[] = {
20 #ifdef CONFIG_EXT_PASSWORD_TEST
21 	&ext_password_test,
22 #endif /* CONFIG_EXT_PASSWORD_TEST */
23 	NULL
24 };
25 
26 struct ext_password_data {
27 	const struct ext_password_backend *backend;
28 	void *priv;
29 };
30 
31 
ext_password_init(const char * backend,const char * params)32 struct ext_password_data * ext_password_init(const char *backend,
33 					     const char *params)
34 {
35 	struct ext_password_data *data;
36 	int i;
37 
38 	data = os_zalloc(sizeof(*data));
39 	if (data == NULL)
40 		return NULL;
41 
42 	for (i = 0; backends[i]; i++) {
43 		if (os_strcmp(backends[i]->name, backend) == 0) {
44 			data->backend = backends[i];
45 			break;
46 		}
47 	}
48 
49 	if (!data->backend) {
50 		os_free(data);
51 		return NULL;
52 	}
53 
54 	data->priv = data->backend->init(params);
55 	if (data->priv == NULL) {
56 		os_free(data);
57 		return NULL;
58 	}
59 
60 	return data;
61 }
62 
63 
ext_password_deinit(struct ext_password_data * data)64 void ext_password_deinit(struct ext_password_data *data)
65 {
66 	if (data && data->backend && data->priv)
67 		data->backend->deinit(data->priv);
68 	os_free(data);
69 }
70 
71 
ext_password_get(struct ext_password_data * data,const char * name)72 struct wpabuf * ext_password_get(struct ext_password_data *data,
73 				 const char *name)
74 {
75 	if (data == NULL)
76 		return NULL;
77 	return data->backend->get(data->priv, name);
78 }
79 
80 
ext_password_alloc(size_t len)81 struct wpabuf * ext_password_alloc(size_t len)
82 {
83 	struct wpabuf *buf;
84 
85 	buf = wpabuf_alloc(len);
86 	if (buf == NULL)
87 		return NULL;
88 
89 #ifdef __linux__
90 	if (mlock(wpabuf_head(buf), wpabuf_len(buf)) < 0) {
91 		wpa_printf(MSG_ERROR, "EXT PW: mlock failed: %s",
92 			   strerror(errno));
93 	}
94 #endif /* __linux__ */
95 
96 	return buf;
97 }
98 
99 
ext_password_free(struct wpabuf * pw)100 void ext_password_free(struct wpabuf *pw)
101 {
102 	if (pw == NULL)
103 		return;
104 	os_memset(wpabuf_mhead(pw), 0, wpabuf_len(pw));
105 #ifdef __linux__
106 	if (munlock(wpabuf_head(pw), wpabuf_len(pw)) < 0) {
107 		wpa_printf(MSG_ERROR, "EXT PW: munlock failed: %s",
108 			   strerror(errno));
109 	}
110 #endif /* __linux__ */
111 	wpabuf_free(pw);
112 }
113