d903306a26
work present in FreeBSD 7.0 to refine the kernel privilege model: - Introduce support for jail as a testing variable, in order to confirm that privileges are properly restricted in the jail environment. - Restructure overall testing approach so that privilege and jail conditions are set in the testing infrastructure before tests are invoked, and done so in a custom-created process to isolate the impact of tests from each other in a more consistent way. - Tests now provide setup and cleanup hooks that occur before and after the test runs. - New privilege tests are now present for several audit privileges, several credential management privileges, dmesg buffer reading privilege, and netinet raw socket creation. - Other existing tests are restructured and generally improved as a result of better framework structure and jail as a variable. For exampe, we now test that certain sysctls are writable only outside jail, while others are writable within jail. On a similar note, privileges relating to setting UFS file flags are now better exercised, as with the right to chmod and utimes files. Approved by: re (bmah) Obtained from: TrustedBSD Project
113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/*-
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* Copyright (c) 2006 nCircle Network Security, Inc.
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* Copyright (c) 2007 Robert N. M. Watson
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* All rights reserved.
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*
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* This software was developed by Robert N. M. Watson for the TrustedBSD
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* Project under contract to nCircle Network Security, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR, NCIRCLE NETWORK SECURITY,
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* INC., OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Test privilege check on /dev/io. By default, the permissions also protect
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* against non-superuser access, so this program will modify permissions on
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* /dev/io to allow world access, and revert the change on exit. This is not
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* good for run-time security, but is necessary to test the checks properly.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "main.h"
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#define NEW_PERMS 0666
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#define DEV_IO "/dev/io"
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#define EXPECTED_PERMS 0600
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static int initialized;
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static mode_t saved_perms;
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int
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priv_io_setup(int asroot, int asjail, struct test *test)
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{
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struct stat sb;
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if (stat(DEV_IO, &sb) < 0) {
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warn("priv_io_setup: stat(%s)", DEV_IO);
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return (-1);
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}
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saved_perms = sb.st_mode & ALLPERMS;
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if (saved_perms != EXPECTED_PERMS) {
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warnx("priv_io_setup: perms = 0%o; expected 0%o",
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saved_perms, EXPECTED_PERMS);
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return (-1);
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}
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if (chmod(DEV_IO, NEW_PERMS) < 0) {
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warn("priv_io_setup: chmod(%s, 0%o)", DEV_IO, NEW_PERMS);
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return (-1);
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}
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initialized = 1;
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return (0);
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}
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void
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priv_io(int asroot, int injail, struct test *test)
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{
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int error, fd;
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fd = open(DEV_IO, O_RDONLY);
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if (fd < 0)
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error = -1;
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else
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error = 0;
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if (asroot && injail)
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expect("priv_io(asroot, injail)", error, -1, EPERM);
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if (asroot && !injail)
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expect("priv_io(asroot, !injail)", error, 0, 0);
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if (!asroot && injail)
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expect("priv_io(!asroot, injail)", error, -1, EPERM);
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if (!asroot && !injail)
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expect("priv_io(!asroot, !injail)", error, -1, EPERM);
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if (fd != -1)
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close(fd);
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}
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void
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priv_io_cleanup(int asroot, int asjail, struct test *test)
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{
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if (!initialized)
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return;
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if (chmod(DEV_IO, saved_perms) < 0)
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err(-1, "priv_io_cleanup: chmod(%s, 0%o)", DEV_IO,
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saved_perms);
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initialized = 0;
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}
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