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Annotation of src/usr.bin/sudo/goodpath.c, Revision 1.4

1.1       millert     1: /*
1.2       millert     2:  * Copyright (c) 1996, 1998, 1999, 2001
1.4     ! millert     3:  *     Todd C. Miller <Todd.Miller@courtesan.com>.
1.1       millert     4:  *
1.4     ! millert     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.
1.3       millert    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.
1.1       millert    20:  */
                     21:
                     22: #include "config.h"
                     23:
1.2       millert    24: #include <sys/types.h>
                     25: #include <sys/stat.h>
                     26: #include <sys/param.h>
1.1       millert    27: #include <stdio.h>
1.2       millert    28: #ifdef HAVE_STRING_H
                     29: # include <string.h>
                     30: #else
                     31: # ifdef HAVE_STRINGS_H
                     32: #  include <strings.h>
                     33: # endif
                     34: #endif /* HAVE_STRING_H */
1.1       millert    35: #ifdef HAVE_UNISTD_H
1.2       millert    36: # include <unistd.h>
1.1       millert    37: #endif /* HAVE_UNISTD_H */
                     38: #include <errno.h>
                     39:
                     40: #include "sudo.h"
                     41:
                     42: #ifndef lint
1.4     ! millert    43: static const char rcsid[] = "$Sudo: goodpath.c,v 1.41 2004/08/24 18:01:13 millert Exp $";
1.1       millert    44: #endif /* lint */
                     45:
                     46: /*
                     47:  * Verify that path is a normal file and executable by root.
                     48:  */
                     49: char *
1.4     ! millert    50: sudo_goodpath(path, sbp)
1.1       millert    51:     const char *path;
1.4     ! millert    52:     struct stat *sbp;
1.1       millert    53: {
                     54:     struct stat sb;
                     55:
                     56:     /* Check for brain damage */
                     57:     if (path == NULL || path[0] == '\0')
                     58:        return(NULL);
                     59:
                     60:     if (stat(path, &sb))
                     61:        return(NULL);
                     62:
                     63:     /* Make sure path describes an executable regular file. */
                     64:     if (!S_ISREG(sb.st_mode) || !(sb.st_mode & 0000111)) {
                     65:        errno = EACCES;
                     66:        return(NULL);
                     67:     }
                     68:
1.4     ! millert    69:     if (sbp != NULL)
        !            70:        (void) memcpy(sbp, &sb, sizeof(struct stat));
1.1       millert    71:     return((char *)path);
                     72: }