diff options
Diffstat (limited to 'tools/regression/priv/priv_vfs_stickyfile.c')
| -rw-r--r-- | tools/regression/priv/priv_vfs_stickyfile.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/tools/regression/priv/priv_vfs_stickyfile.c b/tools/regression/priv/priv_vfs_stickyfile.c new file mode 100644 index 0000000..11c5d5a --- /dev/null +++ b/tools/regression/priv/priv_vfs_stickyfile.c @@ -0,0 +1,140 @@ +/*- + * Copyright (c) 2006 nCircle Network Security, Inc. + * 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. + * + * $FreeBSD$ + */ + +/* + * Check that privilege is required to set the sticky bit on a file, but not + * a directory. Try with and without privilege. + */ + +#include <sys/stat.h> + +#include <err.h> +#include <errno.h> +#include <unistd.h> + +#include "main.h" + +static void +cleanup(const char *fpath, const char *dpath) +{ + + (void)seteuid(UID_ROOT); + (void)unlink(fpath); + if (dpath != NULL) + (void)rmdir(dpath); +} + +void +priv_vfs_stickyfile(void) +{ + char fpath[1024] = "/tmp/stickyfile.XXXXXXXXXXX"; + char dpath[1024] = "/tmp/stickyfile.XXXXXXXXXXX", *dpathp; + int error, fd; + + assert_root(); + + fd = mkstemp(fpath); + if (fd < 0) + err(-1, "mkstemp"); + + dpathp = mkdtemp(dpath); + if (dpathp == NULL) { + warn("mkdtemp"); + goto out; + } + + /* + * First, with privilege, set and clear the sticky bit on the file + * and directory. + */ + if (fchmod(fd, 0600 | S_ISTXT) < 0) { + warn("fchmod(%s, 0600 | S_ISTXT) on file as root", fpath); + goto out; + } + + if (chmod(dpathp, 0700 | S_ISTXT) < 0) { + warn("chmod(%s, 0600 | S_ISTXT) on dir as root", dpath); + goto out; + } + + /* + * Reset to remove sticky bit before changing credential. + */ + if (fchmod(fd, 0600) < 0) { + warn("fchmod(%s, 0600) on file as root", fpath); + goto out; + } + + if (chmod(dpath, 0700) < 0) { + warn("chmod(%s, 0600) on dir as root", dpath); + goto out; + } + + /* + * Chown the file and directory to target user -- we're checking for + * the specific right to set the sticky bit, not the general right to + * chmod(). + */ + if (fchown(fd, UID_OTHER, -1) < 0) { + warn("fchown(%s, %d, -1)", fpath, UID_OTHER); + goto out; + } + + if (chown(dpath, UID_OTHER, -1) < 0) { + warn("chown(%s, %d, -1)", fpath, UID_OTHER); + goto out; + } + + /* + * Change credential and try again. + */ + set_euid(UID_OTHER); + + error = fchmod(fd, 0600 | S_ISTXT); + if (error == 0) { + warnx("fchmod(%s, 0600 | S_ISTXT) succeeded on file as " + "!root", fpath); + goto out; + } + if (errno != EFTYPE) { + warn("fchmod(%s, 0600 | S_ISTXT) wrong errno %d as !root", + fpath, errno); + goto out; + } + + if (chmod(dpathp, 0700 | S_ISTXT) < 0) { + warn("chmod(%s, 0600 | S_ISTXT) on dir as !root", dpath); + goto out; + } +out: + setuid(UID_ROOT); + cleanup(fpath, dpathp); +} |
