1 /*
2 * Copyright (c) 1996, 1998, 1999, 2001
3 * Todd C. Miller <Todd.Miller@courtesan.com>.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 *
17 * Sponsored in part by the Defense Advanced Research Projects
18 * Agency (DARPA) and Air Force Research Laboratory, Air Force
19 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
20 */
21
22 #include "config.h"
23
24 #include <sys/types.h>
25 #include <sys/stat.h>
26 #include <sys/param.h>
27 #include <stdio.h>
28 #ifdef HAVE_STRING_H
29 # include <string.h>
30 #else
31 # ifdef HAVE_STRINGS_H
32 # include <strings.h>
33 # endif
34 #endif /* HAVE_STRING_H */
35 #ifdef HAVE_UNISTD_H
36 # include <unistd.h>
37 #endif /* HAVE_UNISTD_H */
38 #include <errno.h>
39
40 #include "sudo.h"
41
42 #ifndef lint
43 static const char rcsid[] = "$Sudo: goodpath.c,v 1.41 2004/08/24 18:01:13 millert Exp $";
44 #endif /* lint */
45
46 /*
47 * Verify that path is a normal file and executable by root.
48 */
49 char *
sudo_goodpath(path,sbp)50 sudo_goodpath(path, sbp)
51 const char *path;
52 struct stat *sbp;
53 {
54 struct stat sb;
55
56 /* Check for brain damage */
57 if (path == NULL || path[0] == '\0')
58 return(NULL);
59
60 if (stat(path, &sb))
61 return(NULL);
62
63 /* Make sure path describes an executable regular file. */
64 if (!S_ISREG(sb.st_mode) || !(sb.st_mode & 0000111)) {
65 errno = EACCES;
66 return(NULL);
67 }
68
69 if (sbp != NULL)
70 (void) memcpy(sbp, &sb, sizeof(struct stat));
71 return((char *)path);
72 }
73