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sudo v 1.8.10p3

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