ext_password.c revision 61d9df3e62aaa0e87ad05452fcb95142159a17b6 
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
20extern struct ext_password_backend ext_password_test;
21#endif /* CONFIG_EXT_PASSWORD_TEST */
22
23static 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
30struct ext_password_data {
31	const struct ext_password_backend *backend;
32	void *priv;
33};
34
35
36struct 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
68void 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
76struct 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
85struct 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
104void 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