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Annotation of embedaddon/sudo/plugins/sudoers/goodpath.c, revision 1.1.1.1

1.1       misho       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: }