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