1 /*-
2  * Copyright (c) 2006 nCircle Network Security, Inc.
3  * All rights reserved.
4  *
5  * This software was developed by Robert N. M. Watson for the TrustedBSD
6  * Project under contract to nCircle Network Security, Inc.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR, NCIRCLE NETWORK SECURITY,
21  * INC., OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
23  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
24  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
25  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
26  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  *
29  * $FreeBSD$
30  */
31 
32 /*
33  * Confirm that calls to fhopen() require privilege, trying with, and
34  * without.  We create a temporary file and grab the file handle using
35  * getfh() before starting.
36  */
37 
38 #include <sys/param.h>
39 #include <sys/mount.h>
40 
41 #include <err.h>
42 #include <errno.h>
43 #include <fcntl.h>
44 #include <unistd.h>
45 
46 #include "main.h"
47 
48 void
49 priv_vfs_fhopen(void)
50 {
51 	char fpath[1024];
52 	fhandle_t fh;
53 	int fd;
54 
55 	assert_root();
56 
57 	setup_file(fpath, UID_ROOT, GID_WHEEL, 0644);
58 
59 	if (getfh(fpath, &fh) < 0) {
60 		warn("getfh(%s)", fpath);
61 		goto out;
62 	}
63 
64 	/*
65 	 * First, try with privilege.
66 	 */
67 	fd = fhopen(&fh, O_RDONLY);
68 	if (fd < 0) {
69 		warn("fhopen(%s) as root", fpath);
70 		goto out;
71 	}
72 	close(fd);
73 
74 	/*
75 	 * Now, without privilege.
76 	 */
77 	set_euid(UID_OTHER);
78 
79 	fd = fhopen(&fh, O_RDONLY);
80 	if (fd >= 0) {
81 		warnx("fhopen(%s) succeeded as !root", fpath);
82 		close(fd);
83 		goto out;
84 	}
85 	if (errno != EPERM) {
86 		warn("fhopen(%s) wrong errno %d as !root", fpath, errno);
87 		goto out;
88 	}
89 out:
90 	seteuid(UID_ROOT);
91 	(void)unlink(fpath);
92 }
93