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