75 lines
2.3 KiB
C
75 lines
2.3 KiB
C
/*-
|
|
* Based on code copyright (c) 1995,1997 by
|
|
* Berkeley Software Design, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, is permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice immediately at the beginning of the file, without modification,
|
|
* this list of conditions, and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. This work was done expressly for inclusion into FreeBSD. Other use
|
|
* is permitted provided this notation is included.
|
|
* 4. Absolutely no warranty of function or purpose is made by the authors.
|
|
* 5. Modifications may be freely made to this file providing the above
|
|
* conditions are met.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <errno.h>
|
|
#include <libutil.h>
|
|
#include <stddef.h>
|
|
#include <syslog.h>
|
|
|
|
/*
|
|
* Check for common security problems on a given path
|
|
* It must be:
|
|
* 1. A regular file, and exists
|
|
* 2. Owned and writable only by root (or given owner)
|
|
* 3. Group ownership is given group or is non-group writable
|
|
*
|
|
* Returns: -2 if file does not exist,
|
|
* -1 if security test failure
|
|
* 0 otherwise
|
|
*/
|
|
|
|
int
|
|
_secure_path(const char *path, uid_t uid, gid_t gid)
|
|
{
|
|
int r = -1;
|
|
struct stat sb;
|
|
const char *msg = NULL;
|
|
|
|
if (lstat(path, &sb) < 0) {
|
|
if (errno == ENOENT) /* special case */
|
|
r = -2; /* if it is just missing, skip the log entry */
|
|
else
|
|
msg = "%s: cannot stat %s: %m";
|
|
}
|
|
else if (!S_ISREG(sb.st_mode))
|
|
msg = "%s: %s is not a regular file";
|
|
else if (sb.st_mode & S_IWOTH)
|
|
msg = "%s: %s is world writable";
|
|
else if ((int)uid != -1 && sb.st_uid != uid && sb.st_uid != 0) {
|
|
if (uid == 0)
|
|
msg = "%s: %s is not owned by root";
|
|
else
|
|
msg = "%s: %s is not owned by uid %d";
|
|
} else if ((int)gid != -1 && sb.st_gid != gid && (sb.st_mode & S_IWGRP))
|
|
msg = "%s: %s is group writeable by non-authorised groups";
|
|
else
|
|
r = 0;
|
|
if (msg != NULL)
|
|
syslog(LOG_ERR, msg, "_secure_path", path, uid);
|
|
return r;
|
|
}
|