1 /* $NetBSD: safefile.c,v 1.4 2006/09/09 16:22:10 manu Exp $ */
2
3 /* $KAME: safefile.c,v 1.5 2001/03/05 19:54:06 thorpej Exp $ */
4
5 /*
6 * Copyright (C) 2000 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include "config.h"
35
36 #include <sys/types.h>
37 #include <sys/stat.h>
38 #include <sys/socket.h>
39 #include <netinet/in.h>
40 #include <unistd.h>
41
42 #include "plog.h"
43 #include "debug.h"
44 #include "misc.h"
45 #include "safefile.h"
46
47 int
safefile(path,secret)48 safefile(path, secret)
49 const char *path;
50 int secret;
51 {
52 struct stat s;
53 uid_t me;
54
55 /* no setuid */
56 if (getuid() != geteuid()) {
57 plog(LLV_ERROR, LOCATION, NULL,
58 "setuid'ed execution not allowed\n");
59 return -1;
60 }
61
62 if (stat(path, &s) != 0)
63 return -1;
64
65 /* the file must be owned by the running uid */
66 me = getuid();
67 if (s.st_uid != me) {
68 plog(LLV_ERROR, LOCATION, NULL,
69 "%s has invalid owner uid\n", path);
70 return -1;
71 }
72
73 switch (s.st_mode & S_IFMT) {
74 case S_IFREG:
75 break;
76 default:
77 plog(LLV_ERROR, LOCATION, NULL,
78 "%s is an invalid file type 0x%x\n", path,
79 (s.st_mode & S_IFMT));
80 return -1;
81 }
82
83 /* secret file should not be read by others */
84 if (secret) {
85 if ((s.st_mode & S_IRWXG) != 0 || (s.st_mode & S_IRWXO) != 0) {
86 plog(LLV_ERROR, LOCATION, NULL,
87 "%s has weak file permission\n", path);
88 return -1;
89 }
90 }
91
92 return 0;
93 }
94