100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
/*
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* CU sudo version 1.6
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* Copyright (c) 1996, 1998, 1999 Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 1, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Please send bugs, changes, problems to sudo-bugs@courtesan.com
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*
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*******************************************************************
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*
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* This module contains sudo_goodpath(3)
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*
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* sudo_goodpath(3) takes a path to check and returns its argument
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* if the path is stat(2)'able, a regular file, and executable by
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* root. The string's size should be <= MAXPATHLEN.
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*
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* Todd C. Miller <Todd.Miller@courtesan.com> Sat Mar 25 21:58:17 MST 1995
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*/
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#include "config.h"
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#include <stdio.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_STRINGS_H
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#include <strings.h>
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#endif /* HAVE_STRINGS_H */
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <netinet/in.h>
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#include "sudo.h"
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#ifndef STDC_HEADERS
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extern int stat __P((const char *, struct stat *));
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#endif /* !STDC_HEADERS */
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#ifndef lint
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static const char rcsid[] = "$Sudo$";
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#endif /* lint */
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/******************************************************************
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*
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* sudo_goodpath()
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*
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* this function takes a path and makes sure it describes a a file
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* that is a normal file and executable by root.
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*/
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char *
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sudo_goodpath(path)
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const char * path;
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{
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struct stat statbuf; /* for stat(2) */
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int err; /* if stat(2) got an error */
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/* check for brain damage */
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if (path == NULL || path[0] == '\0')
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return(NULL);
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/* we need to be root for the stat */
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set_perms(PERM_ROOT, 0);
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err = stat(path, &statbuf);
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/* discard root perms */
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set_perms(PERM_USER, 0);
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/* stat(3) failed */
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if (err)
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return(NULL);
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/* make sure path describes an executable regular file */
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if (S_ISREG(statbuf.st_mode) && (statbuf.st_mode & 0000111)) {
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return((char *)path);
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} else {
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/* file is not executable/regular */
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errno = EACCES;
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return(NULL);
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}
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}
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