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Annotation of src/usr.bin/sudo/goodpath.c, Revision 1.7

1.1       millert     1: /*
1.5       millert     2:  * Copyright (c) 1996, 1998-2005 Todd C. Miller <Todd.Miller@courtesan.com>
1.1       millert     3:  *
1.4       millert     4:  * Permission to use, copy, modify, and distribute this software for any
                      5:  * purpose with or without fee is hereby granted, provided that the above
                      6:  * copyright notice and this permission notice appear in all copies.
                      7:  *
                      8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                      9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.3       millert    15:  *
                     16:  * Sponsored in part by the Defense Advanced Research Projects
                     17:  * Agency (DARPA) and Air Force Research Laboratory, Air Force
                     18:  * Materiel Command, USAF, under agreement number F39502-99-1-0512.
1.1       millert    19:  */
                     20:
1.5       millert    21: #include <config.h>
1.1       millert    22:
1.2       millert    23: #include <sys/types.h>
                     24: #include <sys/stat.h>
                     25: #include <sys/param.h>
1.1       millert    26: #include <stdio.h>
1.2       millert    27: #ifdef HAVE_STRING_H
                     28: # include <string.h>
                     29: #else
                     30: # ifdef HAVE_STRINGS_H
                     31: #  include <strings.h>
                     32: # endif
                     33: #endif /* HAVE_STRING_H */
1.1       millert    34: #ifdef HAVE_UNISTD_H
1.2       millert    35: # include <unistd.h>
1.1       millert    36: #endif /* HAVE_UNISTD_H */
                     37: #include <errno.h>
                     38:
                     39: #include "sudo.h"
                     40:
                     41: /*
                     42:  * Verify that path is a normal file and executable by root.
                     43:  */
                     44: char *
1.4       millert    45: sudo_goodpath(path, sbp)
1.1       millert    46:     const char *path;
1.4       millert    47:     struct stat *sbp;
1.1       millert    48: {
                     49:     struct stat sb;
                     50:
                     51:     /* Check for brain damage */
                     52:     if (path == NULL || path[0] == '\0')
                     53:        return(NULL);
                     54:
                     55:     if (stat(path, &sb))
                     56:        return(NULL);
                     57:
                     58:     /* Make sure path describes an executable regular file. */
                     59:     if (!S_ISREG(sb.st_mode) || !(sb.st_mode & 0000111)) {
                     60:        errno = EACCES;
                     61:        return(NULL);
                     62:     }
                     63:
1.4       millert    64:     if (sbp != NULL)
                     65:        (void) memcpy(sbp, &sb, sizeof(struct stat));
1.1       millert    66:     return((char *)path);
                     67: }