NetBSD/sys/dev/verified_exec.c

304 lines
6.7 KiB
C

/* $NetBSD: verified_exec.c,v 1.67 2012/03/13 18:40:30 elad Exp $ */
/*-
* Copyright (c) 2005, 2006 Elad Efrat <elad@NetBSD.org>
* Copyright (c) 2005, 2006 Brett Lymn <blymn@NetBSD.org>
* 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.
* 3. The name of the authors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: verified_exec.c,v 1.67 2012/03/13 18:40:30 elad Exp $");
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/conf.h>
#include <sys/vnode.h>
#include <sys/fcntl.h>
#include <sys/namei.h>
#include <sys/verified_exec.h>
#include <sys/kauth.h>
#include <sys/syslog.h>
#include <sys/proc.h>
#ifdef __FreeBSD__
#include <sys/kernel.h>
#include <sys/device_port.h>
#include <sys/ioccom.h>
#else
#include <sys/ioctl.h>
#include <sys/device.h>
#define DEVPORT_DEVICE struct device
#endif
#include <prop/proplib.h>
void veriexecattach(device_t, device_t, void *);
static dev_type_open(veriexecopen);
static dev_type_close(veriexecclose);
static dev_type_ioctl(veriexecioctl);
struct veriexec_softc {
DEVPORT_DEVICE veriexec_dev;
};
#if defined(__FreeBSD__)
# define CDEV_MAJOR 216
# define BDEV_MAJOR -1
#endif
const struct cdevsw veriexec_cdevsw = {
veriexecopen,
veriexecclose,
noread,
nowrite,
veriexecioctl,
#ifdef __NetBSD__
nostop,
notty,
#endif
nopoll,
nommap,
#if defined(__NetBSD__)
nokqfilter,
D_OTHER,
#elif defined(__FreeBSD__)
nostrategy,
"veriexec",
CDEV_MAJOR,
nodump,
nopsize,
0, /* flags */
BDEV_MAJOR
#endif
};
/* count of number of times device is open (we really only allow one open) */
static unsigned int veriexec_dev_usage = 0;
void
veriexecattach(DEVPORT_DEVICE *parent, DEVPORT_DEVICE *self, void *aux)
{
veriexec_dev_usage = 0;
}
static int
veriexecopen(dev_t dev, int flags, int fmt, struct lwp *l)
{
if (kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_VERIEXEC,
KAUTH_REQ_SYSTEM_VERIEXEC_ACCESS, NULL, NULL, NULL))
return (EPERM);
if (veriexec_dev_usage > 0)
return(EBUSY);
veriexec_dev_usage++;
return (0);
}
static int
veriexecclose(dev_t dev, int flags, int fmt, struct lwp *l)
{
if (veriexec_dev_usage > 0)
veriexec_dev_usage--;
return (0);
}
static int
veriexec_delete(prop_dictionary_t dict, struct lwp *l)
{
struct vnode *vp;
const char *file;
int error;
if (!prop_dictionary_get_cstring_nocopy(dict, "file", &file))
return (EINVAL);
error = namei_simple_kernel(file, NSM_FOLLOW_NOEMULROOT, &vp);
if (error)
return (error);
/* XXX this should be done differently... */
if (vp->v_type == VREG)
error = veriexec_file_delete(l, vp);
else if (vp->v_type == VDIR)
error = veriexec_table_delete(l, vp->v_mount);
vrele(vp);
return (error);
}
static int
veriexec_query(prop_dictionary_t dict, prop_dictionary_t rdict, struct lwp *l)
{
struct vnode *vp;
const char *file;
int error;
if (!prop_dictionary_get_cstring_nocopy(dict, "file", &file))
return (EINVAL);
error = namei_simple_kernel(file, NSM_FOLLOW_NOEMULROOT, &vp);
if (error)
return (error);
error = veriexec_convert(vp, rdict);
vrele(vp);
return (error);
}
int
veriexecioctl(dev_t dev, u_long cmd, void *data, int flags, struct lwp *l)
{
struct plistref *plistref;
prop_dictionary_t dict;
int error = 0;
switch (cmd) {
case VERIEXEC_TABLESIZE:
case VERIEXEC_LOAD:
case VERIEXEC_DELETE:
case VERIEXEC_FLUSH:
if (!(flags & FWRITE))
return (EPERM);
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_VERIEXEC,
KAUTH_REQ_SYSTEM_VERIEXEC_MODIFY, KAUTH_ARG(cmd), NULL,
NULL);
if (error)
return error;
break;
case VERIEXEC_QUERY:
case VERIEXEC_DUMP:
if (!(flags & FREAD))
return (EPERM);
break;
default:
/* Invalid operation. */
return (ENODEV);
}
plistref = (struct plistref *)data;
switch (cmd) {
case VERIEXEC_TABLESIZE:
/* Do nothing. Kept for binary compatibility. */
break;
case VERIEXEC_LOAD:
error = prop_dictionary_copyin_ioctl(plistref, cmd, &dict);
if (error)
break;
error = veriexec_file_add(l, dict);
prop_object_release(dict);
break;
case VERIEXEC_DELETE:
error = prop_dictionary_copyin_ioctl(plistref, cmd, &dict);
if (error)
break;
error = veriexec_delete(dict, l);
prop_object_release(dict);
break;
case VERIEXEC_QUERY: {
prop_dictionary_t rdict;
error = prop_dictionary_copyin_ioctl(plistref, cmd, &dict);
if (error)
return (error);
rdict = prop_dictionary_create();
if (rdict == NULL) {
prop_object_release(dict);
error = ENOMEM;
break;
}
error = veriexec_query(dict, rdict, l);
if (error == 0) {
error = prop_dictionary_copyout_ioctl(plistref, cmd,
rdict);
}
prop_object_release(rdict);
prop_object_release(dict);
break;
}
case VERIEXEC_DUMP: {
prop_array_t rarray;
rarray = prop_array_create();
if (rarray == NULL) {
error = ENOMEM;
break;
}
error = veriexec_dump(l, rarray);
if (error == 0) {
error = prop_array_copyout_ioctl(plistref, cmd,
rarray);
}
prop_object_release(rarray);
break;
}
case VERIEXEC_FLUSH:
error = veriexec_flush(l);
break;
default:
/* Invalid operation. */
error = ENODEV;
break;
}
return (error);
}
#if defined(__FreeBSD__)
static void
veriexec_drvinit(void *unused)
{
make_dev(&verifiedexec_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
"veriexec");
verifiedexecattach(0, 0, 0);
}
SYSINIT(veriexec, SI_SUB_PSEUDO, SI_ORDER_ANY, veriexec_drvinit, NULL);
#endif