2 * Based on code copyright (c) 1995,1997 by
3 * Berkeley Software Design, Inc.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, is permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice immediately at the beginning of the file, without modification,
11 * this list of conditions, and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. This work was done expressly for inclusion into FreeBSD. Other use
16 * is permitted provided this notation is included.
17 * 4. Absolutely no warranty of function or purpose is made by the authors.
18 * 5. Modifications may be freely made to this file providing the above
22 #include <sys/cdefs.h>
23 __FBSDID("$FreeBSD$");
25 #include <sys/types.h>
34 * Check for common security problems on a given path
36 * 1. A regular file, and exists
37 * 2. Owned and writaable only by root (or given owner)
38 * 3. Group ownership is given group or is non-group writable
40 * Returns: -2 if file does not exist,
41 * -1 if security test failure
46 _secure_path(const char *path, uid_t uid, gid_t gid)
50 const char *msg = NULL;
52 if (lstat(path, &sb) < 0) {
53 if (errno == ENOENT) /* special case */
54 r = -2; /* if it is just missing, skip the log entry */
56 msg = "%s: cannot stat %s: %m";
58 else if (!S_ISREG(sb.st_mode))
59 msg = "%s: %s is not a regular file";
60 else if (sb.st_mode & S_IWOTH)
61 msg = "%s: %s is world writable";
62 else if (uid != -1 && sb.st_uid != uid && sb.st_uid != 0) {
64 msg = "%s: %s is not owned by root";
66 msg = "%s: %s is not owned by uid %d";
67 } else if (gid != -1 && sb.st_gid != gid && (sb.st_mode & S_IWGRP))
68 msg = "%s: %s is group writeable by non-authorised groups";
72 syslog(LOG_ERR, msg, "_secure_path", path, uid);