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authorGuido van Rooij <guido@FreeBSD.org>1997-03-23 20:08:22 +0000
committerGuido van Rooij <guido@FreeBSD.org>1997-03-23 20:08:22 +0000
commit8f89943eda4491e3d0a67cc4084e0c9c49d5be52 (patch)
treeb9411eec7d5aa143a88d2b00622c513c58e81906 /sbin/fsirand/fsirand.8
parent8187fe48133bc2a01ee7fcbb9ad4589c545490f0 (diff)
downloadsrc-8f89943eda4491e3d0a67cc4084e0c9c49d5be52.tar.gz
src-8f89943eda4491e3d0a67cc4084e0c9c49d5be52.zip
Add generation number randomization. Newly created filesystems wil now
automatically have random generation numbers. The kenel way of handling those also changed. Further it is advised to run fsirand on all your nfs exported filesystems. the code is mostly copied from OpenBSD, with the randomization chanegd to use /dev/urandom Reviewed by: Garrett Obtained from: OpenBSD
Notes
Notes: svn path=/head/; revision=24149
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+.\" Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, 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. All advertising materials mentioning features or use of this software
+.\" must display the following acknowledgement:
+.\" This product includes software developed by Todd C. Miller.
+.\" 4. The name of the author may not be used to endorse or promote products
+.\" derived from this software without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+.\" AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+.\" THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+.\" EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+.\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+.\" OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+.\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+.\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $OpenBSD: fsirand.8,v 1.6 1997/02/23 03:58:26 millert Exp $
+.\"
+.Dd January 25, 1997
+.Dt FSIRAND 8
+.Os
+.Sh NAME
+.Nm fsirand
+.Nd randomize inode generation numbers
+.Sh SYNOPSIS
+.Nm fsirand
+.Op Fl b
+.Op Fl f
+.Op Fl p
+.Ar special
+.Op Ar "special ..."
+.Sh DESCRIPTION
+The
+.Nm fsirand
+command installs random generation numbers on all the inodes for
+each filesystem specified on the command line by
+.Ar special .
+This increases the security of NFS-exported filesystems by making
+it difficult to ``guess'' filehandles.
+.Pp
+.Em Note:
+.Xr newfs 8
+now does the equivalent of
+.Nm
+itself so it is no longer necesary to
+run
+.Nm
+by hand on a new filesystem. It is only used to
+re-randomize or report on an existing filesystem.
+.Pp
+.Nm Fsirand
+should only be used on an unmounted filesystem that
+has been checked with
+.Xr fsck 8
+or a filesystem that is mounted read-only.
+.Nm Fsirand
+may be used on the root filesystem in single-user mode
+but the system should be rebooted via ``reboot -n'' afterwards.
+.Sh OPTIONS
+.Bl -tag -width indent
+The available options are as follows:
+.It Fl b
+Use the default block size (usuallyt 512 bytes) instead
+of the value gleaned from the disklabel.
+.It Fl f
+Force
+.Nm
+to run even if the filesystem on
+.Ar special
+is not marked as clean.
+.It Fl p
+Print the current generation numbers for all inodes instead of
+generating new ones.
+.Sh CAVEATS
+Since
+.Nm
+allocates enough memory to hold all the inodes in
+a given cylinder group it is may use a large amount
+of memory for large disks with few cylinder groups.
+.Sh SEE ALSO
+.Xr fs 5 ,
+.Xr fsck 8 ,
+.Xr newfs 8 .
+.Sh HISTORY
+The
+.Nm
+command appeared in SunOS 3.x.
+.br
+This version of
+.Nm
+first appeared in
+.Bx Open
+2.1.
+.Sh AUTHOR
+.nf
+Todd C. Miller <Todd.Miller@courtesan.com>
+.fi