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/* $NetBSD: keylock.c,v 1.3 2014/02/25 18:30:09 pooka Exp $ */
/*
* Copyright (c) 2009 Marc Balmer <marc@msys.ch>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "opt_secmodel_keylock.h"
/* Support for multi-position electro-mechanical keylocks */
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <dev/keylock.h>
#ifdef secmodel_keylock
#include <sys/kauth.h>
#include <secmodel/keylock/keylock.h>
#endif
static int (*keylock_pos_cb)(void *) = NULL;
static void *keylock_pos_cb_arg = NULL;
static int keylock_npos = 0;
static int keylock_order = 0;
int keylock_pos_sysctl(SYSCTLFN_PROTO);
int keylock_state_sysctl(SYSCTLFN_PROTO);
int keylock_order_sysctl(SYSCTLFN_PROTO);
SYSCTL_SETUP(sysctl_keylock_setup, "sysctl keylock setup")
{
const struct sysctlnode *node = NULL;
sysctl_createv(clog, 0, NULL, &node,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "keylock",
SYSCTL_DESCR("Keylock state"),
NULL, 0, NULL, 0,
CTL_HW, CTL_CREATE, CTL_EOL);
if (node == NULL)
return;
sysctl_createv(clog, 0, &node, NULL,
CTLFLAG_PERMANENT | CTLFLAG_READONLY,
CTLTYPE_INT, "pos",
SYSCTL_DESCR("Current keylock position"),
keylock_pos_sysctl, 0, NULL, 0,
CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, &node, NULL,
CTLFLAG_PERMANENT | CTLFLAG_READONLY,
CTLTYPE_INT, "npos",
SYSCTL_DESCR("Number of keylock positions"),
NULL, 0, &keylock_npos, 0,
CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, &node, NULL,
CTLFLAG_PERMANENT | CTLFLAG_READONLY,
CTLTYPE_INT, "state",
SYSCTL_DESCR("Keylock state"),
keylock_state_sysctl, 0, NULL, 0,
CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, &node, NULL,
CTLFLAG_PERMANENT | CTLFLAG_READWRITE,
CTLTYPE_INT, "order",
SYSCTL_DESCR("Keylock closedness order"),
keylock_order_sysctl, 0, NULL, 0,
CTL_CREATE, CTL_EOL);
}
int
keylock_register(void *cb_arg, int npos, int (*cb)(void *))
{
if (keylock_pos_cb != NULL)
return -1;
keylock_pos_cb = cb;
keylock_pos_cb_arg = cb_arg;
keylock_npos = npos;
#ifdef secmodel_keylock
secmodel_keylock_start();
#endif
return 0;
}
void
keylock_unregister(void *cb_arg, int (*cb)(void *))
{
if (keylock_pos_cb != cb || keylock_pos_cb_arg != cb_arg)
return;
#ifdef secmodel_keylock
secmodel_keylock_stop();
#endif
keylock_pos_cb = NULL;
keylock_pos_cb_arg = NULL;
keylock_npos = 0;
}
int
keylock_position(void)
{
if (keylock_pos_cb == NULL)
return 0;
return (*keylock_pos_cb)(keylock_pos_cb_arg);
}
int
keylock_num_positions(void)
{
return keylock_npos;
}
int
keylock_state(void)
{
int pos;
if (keylock_npos == 0)
return KEYLOCK_ABSENT;
pos = keylock_position();
if (pos == 0)
return KEYLOCK_TAMPER;
/*
* XXX How should the intermediate positions be handled?
* At the moment only the ultimate positions are properly handled,
* we need to think about what we do with the intermediate positions.
* For now we return KEYLOCK_SEMIOPEN for them.
*/
if (pos == 1)
return keylock_order == 0 ? KEYLOCK_CLOSE : KEYLOCK_OPEN;
else if (pos == keylock_npos)
return keylock_order == 0 ? KEYLOCK_OPEN : KEYLOCK_CLOSE;
return KEYLOCK_SEMIOPEN;
}
int
keylock_pos_sysctl(SYSCTLFN_ARGS)
{
struct sysctlnode node;
int val;
node = *rnode;
node.sysctl_data = &val;
val = keylock_position();
return sysctl_lookup(SYSCTLFN_CALL(&node));
}
int
keylock_state_sysctl(SYSCTLFN_ARGS)
{
struct sysctlnode node;
int val;
node = *rnode;
node.sysctl_data = &val;
val = keylock_state();
return sysctl_lookup(SYSCTLFN_CALL(&node));
}
int
keylock_order_sysctl(SYSCTLFN_ARGS)
{
struct sysctlnode node;
int val, error;
node = *rnode;
node.sysctl_data = &val;
val = keylock_order;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return error;
if (keylock_state() != KEYLOCK_OPEN)
return -1;
keylock_order = val;
return 0;
}
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