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