Annotation of src/usr.bin/sudo/goodpath.c, Revision 1.1.1.1
1.1 millert 1: /*
2: * Copyright (c) 1996, 1998, 1999 Todd C. Miller <Todd.Miller@courtesan.com>
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: *
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: *
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: *
16: * 3. The name of the author may not be used to endorse or promote products
17: * derived from this software without specific prior written permission.
18: *
19: * 4. Products derived from this software may not be called "Sudo" nor
20: * may "Sudo" appear in their names without specific prior written
21: * permission from the author.
22: *
23: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
24: * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
25: * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
26: * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
27: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
28: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
29: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
30: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
31: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
32: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33: */
34:
35: #include "config.h"
36:
37: #include <stdio.h>
38: #ifdef HAVE_UNISTD_H
39: #include <unistd.h>
40: #endif /* HAVE_UNISTD_H */
41: #ifdef HAVE_STRING_H
42: #include <string.h>
43: #endif /* HAVE_STRING_H */
44: #ifdef HAVE_STRINGS_H
45: #include <strings.h>
46: #endif /* HAVE_STRINGS_H */
47: #include <errno.h>
48: #include <sys/types.h>
49: #include <sys/stat.h>
50: #include <sys/param.h>
51:
52: #include "sudo.h"
53:
54: #ifndef STDC_HEADERS
55: extern int stat __P((const char *, struct stat *));
56: #endif /* !STDC_HEADERS */
57:
58: #ifndef lint
59: static const char rcsid[] = "$Sudo: goodpath.c,v 1.37 1999/08/20 20:37:14 millert Exp $";
60: #endif /* lint */
61:
62: /*
63: * Verify that path is a normal file and executable by root.
64: */
65: char *
66: sudo_goodpath(path)
67: const char *path;
68: {
69: struct stat sb;
70:
71: /* Check for brain damage */
72: if (path == NULL || path[0] == '\0')
73: return(NULL);
74:
75: if (stat(path, &sb))
76: return(NULL);
77:
78: /* Make sure path describes an executable regular file. */
79: if (!S_ISREG(sb.st_mode) || !(sb.st_mode & 0000111)) {
80: errno = EACCES;
81: return(NULL);
82: }
83:
84: return((char *)path);
85: }