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 #ifdef CONFIG_EXT_PASSWORD_TEST
20 extern struct ext_password_backend ext_password_test;
21 #endif /* CONFIG_EXT_PASSWORD_TEST */
22
23 static const struct ext_password_backend *backends[] = {
24 #ifdef CONFIG_EXT_PASSWORD_TEST
25 &ext_password_test,
26 #endif /* CONFIG_EXT_PASSWORD_TEST */
27 NULL
28 };
29
30 struct ext_password_data {
31 const struct ext_password_backend *backend;
32 void *priv;
33 };
34
35
ext_password_init(const char * backend,const char * params)36 struct ext_password_data * ext_password_init(const char *backend,
37 const char *params)
38 {
39 struct ext_password_data *data;
40 int i;
41
42 data = os_zalloc(sizeof(*data));
43 if (data == NULL)
44 return NULL;
45
46 for (i = 0; backends[i]; i++) {
47 if (os_strcmp(backends[i]->name, backend) == 0) {
48 data->backend = backends[i];
49 break;
50 }
51 }
52
53 if (!data->backend) {
54 os_free(data);
55 return NULL;
56 }
57
58 data->priv = data->backend->init(params);
59 if (data->priv == NULL) {
60 os_free(data);
61 return NULL;
62 }
63
64 return data;
65 }
66
67
ext_password_deinit(struct ext_password_data * data)68 void ext_password_deinit(struct ext_password_data *data)
69 {
70 if (data && data->backend && data->priv)
71 data->backend->deinit(data->priv);
72 os_free(data);
73 }
74
75
ext_password_get(struct ext_password_data * data,const char * name)76 struct wpabuf * ext_password_get(struct ext_password_data *data,
77 const char *name)
78 {
79 if (data == NULL)
80 return NULL;
81 return data->backend->get(data->priv, name);
82 }
83
84
ext_password_alloc(size_t len)85 struct wpabuf * ext_password_alloc(size_t len)
86 {
87 struct wpabuf *buf;
88
89 buf = wpabuf_alloc(len);
90 if (buf == NULL)
91 return NULL;
92
93 #ifdef __linux__
94 if (mlock(wpabuf_head(buf), wpabuf_len(buf)) < 0) {
95 wpa_printf(MSG_ERROR, "EXT PW: mlock failed: %s",
96 strerror(errno));
97 }
98 #endif /* __linux__ */
99
100 return buf;
101 }
102
103
ext_password_free(struct wpabuf * pw)104 void ext_password_free(struct wpabuf *pw)
105 {
106 if (pw == NULL)
107 return;
108 os_memset(wpabuf_mhead(pw), 0, wpabuf_len(pw));
109 #ifdef __linux__
110 if (munlock(wpabuf_head(pw), wpabuf_len(pw)) < 0) {
111 wpa_printf(MSG_ERROR, "EXT PW: munlock failed: %s",
112 strerror(errno));
113 }
114 #endif /* __linux__ */
115 wpabuf_free(pw);
116 }
117