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Annotation of embedaddon/sudo/common/secure_path.c, revision 1.1.1.2

1.1       misho       1: /*
                      2:  * Copyright (c) 2012 Todd C. Miller <Todd.Miller@courtesan.com>
                      3:  *
                      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.
                     15:  */
                     16: 
                     17: #include <config.h>
                     18: 
                     19: #include <sys/types.h>
                     20: #include <sys/stat.h>
                     21: #include <sys/param.h>
                     22: #include <stdio.h>
                     23: #ifdef HAVE_STRING_H
                     24: # include <string.h>
                     25: #endif /* HAVE_STRING_H */
                     26: #ifdef HAVE_STRINGS_H
                     27: # include <strings.h>
                     28: #endif /* HAVE_STRINGS_H */
                     29: #ifdef HAVE_UNISTD_H
                     30: # include <unistd.h>
                     31: #endif /* HAVE_UNISTD_H */
                     32: #include <errno.h>
                     33: 
                     34: #include "missing.h"
                     35: #include "sudo_debug.h"
                     36: #include "secure_path.h"
                     37: 
                     38: /*
                     39:  * Verify that path is the right type and not writable by other users.
                     40:  */
                     41: int
                     42: sudo_secure_path(const char *path, int type, uid_t uid, gid_t gid, struct stat *sbp)
                     43: {
                     44:     struct stat sb;
                     45:     int rval = SUDO_PATH_MISSING;
                     46:     debug_decl(sudo_secure_path, SUDO_DEBUG_UTIL)
                     47: 
1.1.1.2 ! misho      48:     if (path != NULL && stat(path, &sb) == 0) {
1.1       misho      49:        if ((sb.st_mode & _S_IFMT) != type) {
                     50:            rval = SUDO_PATH_BAD_TYPE;
                     51:        } else if (uid != (uid_t)-1 && sb.st_uid != uid) {
                     52:            rval = SUDO_PATH_WRONG_OWNER;
                     53:        } else if (sb.st_mode & S_IWOTH) {
                     54:            rval = SUDO_PATH_WORLD_WRITABLE;
                     55:        } else if (ISSET(sb.st_mode, S_IWGRP) &&
                     56:            (gid == (gid_t)-1 || sb.st_gid != gid)) {
                     57:            rval = SUDO_PATH_GROUP_WRITABLE;
                     58:        } else {
                     59:            rval = SUDO_PATH_SECURE;
                     60:        }
                     61:        if (sbp)
                     62:            (void) memcpy(sbp, &sb, sizeof(struct stat));
                     63:     }
                     64: 
                     65:     debug_return_int(rval);
                     66: }
                     67: 
                     68: /*
                     69:  * Verify that path is a regular file and not writable by other users.
                     70:  */
                     71: int
                     72: sudo_secure_file(const char *path, uid_t uid, gid_t gid, struct stat *sbp)
                     73: {
                     74:     return sudo_secure_path(path, _S_IFREG, uid, gid, sbp);
                     75: }
                     76: 
                     77: /*
                     78:  * Verify that path is a directory and not writable by other users.
                     79:  */
                     80: int
                     81: sudo_secure_dir(const char *path, uid_t uid, gid_t gid, struct stat *sbp)
                     82: {
                     83:     return sudo_secure_path(path, _S_IFDIR, uid, gid, sbp);
                     84: }