libkvm - Interim solution to boost swap statistics fields
[dragonfly.git] / lib / libutil / _secure_path.c
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1 /*-
2 * Based on code copyright (c) 1995,1997 by
3 * Berkeley Software Design, Inc.
4 * All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, is permitted provided that the following conditions
8 * are met:
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
19 * conditions are met.
21 * $FreeBSD: head/lib/libutil/_secure_path.c 139012 2004-12-18 12:31:12Z ru $
25 #include <sys/types.h>
26 #include <sys/stat.h>
28 #include <errno.h>
29 #include <libutil.h>
30 #include <syslog.h>
33 * Check for common security problems on a given path
34 * It must be:
35 * 1. A regular file, and exists
36 * 2. Owned and writable only by root (or given owner)
37 * 3. Group ownership is given group or is non-group writable
39 * Returns: -2 if file does not exist,
40 * -1 if security test failure
41 * 0 otherwise
44 int
45 _secure_path(const char *path, uid_t uid, gid_t gid)
47 int r = -1;
48 struct stat sb;
49 const char *msg = NULL;
51 if (lstat(path, &sb) < 0) {
52 if (errno == ENOENT) /* special case */
53 r = -2; /* if it is just missing, skip the log entry */
54 else
55 msg = "%s: cannot stat %s: %m";
57 else if (!S_ISREG(sb.st_mode))
58 msg = "%s: %s is not a regular file";
59 else if (sb.st_mode & S_IWOTH)
60 msg = "%s: %s is world writable";
61 else if ((int)uid != -1 && sb.st_uid != uid && sb.st_uid != 0) {
62 if (uid == 0)
63 msg = "%s: %s is not owned by root";
64 else
65 msg = "%s: %s is not owned by uid %d";
66 } else if ((int)gid != -1 && sb.st_gid != gid && (sb.st_mode & S_IWGRP))
67 msg = "%s: %s is group writeable by non-authorised groups";
68 else
69 r = 0;
70 if (msg != NULL)
71 syslog(LOG_ERR, msg, "_secure_path", path, uid);
72 return r;