1 /* $NetBSD: keylock.c,v 1.3 2014/02/25 18:30:09 pooka Exp $ */
2
3 /*
4 * Copyright (c) 2009 Marc Balmer <marc@msys.ch>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "opt_secmodel_keylock.h"
29
30 /* Support for multi-position electro-mechanical keylocks */
31
32 #include <sys/param.h>
33 #include <sys/kernel.h>
34 #include <sys/sysctl.h>
35
36 #include <dev/keylock.h>
37
38 #ifdef secmodel_keylock
39 #include <sys/kauth.h>
40 #include <secmodel/keylock/keylock.h>
41 #endif
42
43 static int (*keylock_pos_cb)(void *) = NULL;
44 static void *keylock_pos_cb_arg = NULL;
45 static int keylock_npos = 0;
46 static int keylock_order = 0;
47
48 int keylock_pos_sysctl(SYSCTLFN_PROTO);
49 int keylock_state_sysctl(SYSCTLFN_PROTO);
50 int keylock_order_sysctl(SYSCTLFN_PROTO);
51
52 SYSCTL_SETUP(sysctl_keylock_setup, "sysctl keylock setup")
53 {
54 const struct sysctlnode *node = NULL;
55
56 sysctl_createv(clog, 0, NULL, &node,
57 CTLFLAG_PERMANENT,
58 CTLTYPE_NODE, "keylock",
59 SYSCTL_DESCR("Keylock state"),
60 NULL, 0, NULL, 0,
61 CTL_HW, CTL_CREATE, CTL_EOL);
62
63 if (node == NULL)
64 return;
65
66 sysctl_createv(clog, 0, &node, NULL,
67 CTLFLAG_PERMANENT | CTLFLAG_READONLY,
68 CTLTYPE_INT, "pos",
69 SYSCTL_DESCR("Current keylock position"),
70 keylock_pos_sysctl, 0, NULL, 0,
71 CTL_CREATE, CTL_EOL);
72 sysctl_createv(clog, 0, &node, NULL,
73 CTLFLAG_PERMANENT | CTLFLAG_READONLY,
74 CTLTYPE_INT, "npos",
75 SYSCTL_DESCR("Number of keylock positions"),
76 NULL, 0, &keylock_npos, 0,
77 CTL_CREATE, CTL_EOL);
78 sysctl_createv(clog, 0, &node, NULL,
79 CTLFLAG_PERMANENT | CTLFLAG_READONLY,
80 CTLTYPE_INT, "state",
81 SYSCTL_DESCR("Keylock state"),
82 keylock_state_sysctl, 0, NULL, 0,
83 CTL_CREATE, CTL_EOL);
84 sysctl_createv(clog, 0, &node, NULL,
85 CTLFLAG_PERMANENT | CTLFLAG_READWRITE,
86 CTLTYPE_INT, "order",
87 SYSCTL_DESCR("Keylock closedness order"),
88 keylock_order_sysctl, 0, NULL, 0,
89 CTL_CREATE, CTL_EOL);
90 }
91
92 int
keylock_register(void * cb_arg,int npos,int (* cb)(void *))93 keylock_register(void *cb_arg, int npos, int (*cb)(void *))
94 {
95 if (keylock_pos_cb != NULL)
96 return -1;
97
98 keylock_pos_cb = cb;
99 keylock_pos_cb_arg = cb_arg;
100 keylock_npos = npos;
101 #ifdef secmodel_keylock
102 secmodel_keylock_start();
103 #endif
104 return 0;
105 }
106
107 void
keylock_unregister(void * cb_arg,int (* cb)(void *))108 keylock_unregister(void *cb_arg, int (*cb)(void *))
109 {
110 if (keylock_pos_cb != cb || keylock_pos_cb_arg != cb_arg)
111 return;
112
113 #ifdef secmodel_keylock
114 secmodel_keylock_stop();
115 #endif
116 keylock_pos_cb = NULL;
117 keylock_pos_cb_arg = NULL;
118 keylock_npos = 0;
119 }
120
121 int
keylock_position(void)122 keylock_position(void)
123 {
124 if (keylock_pos_cb == NULL)
125 return 0;
126
127 return (*keylock_pos_cb)(keylock_pos_cb_arg);
128 }
129
130 int
keylock_num_positions(void)131 keylock_num_positions(void)
132 {
133 return keylock_npos;
134 }
135
136 int
keylock_state(void)137 keylock_state(void)
138 {
139 int pos;
140
141 if (keylock_npos == 0)
142 return KEYLOCK_ABSENT;
143
144 pos = keylock_position();
145 if (pos == 0)
146 return KEYLOCK_TAMPER;
147
148 /*
149 * XXX How should the intermediate positions be handled?
150 * At the moment only the ultimate positions are properly handled,
151 * we need to think about what we do with the intermediate positions.
152 * For now we return KEYLOCK_SEMIOPEN for them.
153 */
154 if (pos == 1)
155 return keylock_order == 0 ? KEYLOCK_CLOSE : KEYLOCK_OPEN;
156 else if (pos == keylock_npos)
157 return keylock_order == 0 ? KEYLOCK_OPEN : KEYLOCK_CLOSE;
158 return KEYLOCK_SEMIOPEN;
159 }
160
161 int
keylock_pos_sysctl(SYSCTLFN_ARGS)162 keylock_pos_sysctl(SYSCTLFN_ARGS)
163 {
164 struct sysctlnode node;
165 int val;
166
167 node = *rnode;
168 node.sysctl_data = &val;
169
170 val = keylock_position();
171 return sysctl_lookup(SYSCTLFN_CALL(&node));
172 }
173
174 int
keylock_state_sysctl(SYSCTLFN_ARGS)175 keylock_state_sysctl(SYSCTLFN_ARGS)
176 {
177 struct sysctlnode node;
178 int val;
179
180 node = *rnode;
181 node.sysctl_data = &val;
182
183 val = keylock_state();
184 return sysctl_lookup(SYSCTLFN_CALL(&node));
185 }
186
187 int
keylock_order_sysctl(SYSCTLFN_ARGS)188 keylock_order_sysctl(SYSCTLFN_ARGS)
189 {
190 struct sysctlnode node;
191 int val, error;
192
193 node = *rnode;
194 node.sysctl_data = &val;
195
196 val = keylock_order;
197 error = sysctl_lookup(SYSCTLFN_CALL(&node));
198 if (error || newp == NULL)
199 return error;
200 if (keylock_state() != KEYLOCK_OPEN)
201 return -1;
202
203 keylock_order = val;
204 return 0;
205 }
206
207