diff options
Diffstat (limited to 'tools/regression/priv/priv_vfs_generation.c')
| -rw-r--r-- | tools/regression/priv/priv_vfs_generation.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/tools/regression/priv/priv_vfs_generation.c b/tools/regression/priv/priv_vfs_generation.c new file mode 100644 index 000000000000..e0e17b4050d1 --- /dev/null +++ b/tools/regression/priv/priv_vfs_generation.c @@ -0,0 +1,118 @@ +/*- + * Copyright (c) 2006 nCircle Network Security, Inc. + * Copyright (c) 2007 Robert N. M. Watson + * All rights reserved. + * + * This software was developed by Robert N. M. Watson for the TrustedBSD + * Project under contract to nCircle Network Security, Inc. + * + * 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 AND CONTRIBUTORS ``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, NCIRCLE NETWORK SECURITY, + * INC., OR CONTRIBUTORS 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. + */ + +/* + * Confirm that a generation number isn't returned by stat() when not running + * with privilege. In order to differentiate between a generation of 0 and + * a generation not being returned, we have to create a temporary file known + * to have a non-0 generation. We try up to MAX_TRIES times, and then give + * up, which is non-ideal, but better than not testing for a problem. + */ + +#include <sys/stat.h> + +#include <err.h> +#include <errno.h> +#include <string.h> +#include <unistd.h> + +#include "main.h" + +static char fpath[1024]; +static int fpath_initialized; + +#define MAX_TRIES 100 + +int +priv_vfs_generation_setup(int asroot, int injail, struct test *test) +{ + struct stat sb; + int i; + + /* + * The kernel zeros the generation number field when an unprivileged + * user stats a file. In order to distinguish the two cases, we + * therefore require a file that we know has a non-zero generation + * number. We try up to MAX_TRIES times and otherwise fail. + */ + for (i = 0; i < MAX_TRIES; i++) { + setup_file("priv_vfs_generation_setup: fpath", fpath, + UID_ROOT, GID_WHEEL, 0644); + if (stat(fpath, &sb) < 0) { + warn("priv_vfs_generation_setup: fstat(%s)", fpath); + (void)unlink(fpath); + return (-1); + } + if (sb.st_gen != 0) { + fpath_initialized = 1; + return (0); + } + } + warnx("priv_vfs_generation_setup: unable to create gen file"); + return (-1); +} + +void +priv_vfs_generation(int asroot, int injail, struct test *test) +{ + struct stat sb; + int error; + + error = stat(fpath, &sb); + if (error < 0) + warn("priv_vfs_generation(asroot, injail) stat"); + + if (sb.st_gen == 0) { + error = -1; + errno = EPERM; + } else + error = 0; + if (asroot && injail) + expect("priv_vfs_generation(asroot, injail)", error, -1, + EPERM); + if (asroot && !injail) + expect("priv_vfs_generation(asroot, !injail)", error, 0, 0); + if (!asroot && injail) + expect("priv_vfs_generation(!asroot, injail)", error, -1, + EPERM); + if (!asroot && !injail) + expect("priv_vfs_generation(!asroot, !injail)", error, -1, + EPERM); +} + +void +priv_vfs_generation_cleanup(int asroot, int injail, struct test *test) +{ + + if (fpath_initialized) { + (void)unlink(fpath); + fpath_initialized = 0; + } +} |