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Initial revision

    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: 
   48:     if (path != NULL && stat_sudoers(path, &sb) == 0) {
   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: }