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Initial revision

    1: /*
    2:  * Copyright (c) 1996, 1998-2005, 2010-2011
    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: #endif /* HAVE_STRING_H */
   31: #ifdef HAVE_STRINGS_H
   32: # include <strings.h>
   33: #endif /* HAVE_STRINGS_H */
   34: #ifdef HAVE_UNISTD_H
   35: # include <unistd.h>
   36: #endif /* HAVE_UNISTD_H */
   37: #include <errno.h>
   38: 
   39: #include "sudoers.h"
   40: 
   41: /*
   42:  * Verify that path is a normal file and executable by root.
   43:  */
   44: char *
   45: sudo_goodpath(const char *path, struct stat *sbp)
   46: {
   47:     struct stat sb;
   48: 
   49:     /* Check for brain damage */
   50:     if (path == NULL || path[0] == '\0')
   51: 	return NULL;
   52: 
   53:     if (stat(path, &sb))
   54: 	return NULL;
   55: 
   56:     /* Make sure path describes an executable regular file. */
   57:     if (!S_ISREG(sb.st_mode) || !(sb.st_mode & 0000111)) {
   58: 	errno = EACCES;
   59: 	return NULL;
   60:     }
   61: 
   62:     if (sbp != NULL)
   63: 	(void) memcpy(sbp, &sb, sizeof(struct stat));
   64:     return (char *)path;
   65: }