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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: }