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.\" $Id: ssh-rand-helper.8,v 1.3 2007/01/22 01:44:53 djm Exp $
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.\"
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.\" Copyright (c) 2002 Damien Miller. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd April 14, 2002
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.Dt SSH-RAND-HELPER 8
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.Os
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.Sh NAME
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.Nm ssh-rand-helper
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.Nd random number gatherer for OpenSSH
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.Sh SYNOPSIS
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.Nm ssh-rand-hlper
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.Op Fl vxXh
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.Op Fl b Ar bytes
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.Sh DESCRIPTION
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.Nm
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is a small helper program used by
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.Xr ssh 1 ,
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.Xr ssh-add 1 ,
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.Xr ssh-agent 1 ,
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.Xr ssh-keygen 1 ,
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.Xr ssh-keyscan 1
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and
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.Xr sshd 8
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to gather random numbers of cryptographic quality if the
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.Xr openssl 4
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library has not been configured to provide them itself.
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.Pp
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Normally
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.Nm
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will generate a strong random seed and provide it to the calling
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program via standard output. If standard output is a tty,
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.Nm
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will instead print the seed in hexidecimal format unless told otherwise.
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.Pp
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.Nm
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will by default gather random numbers from the system commands listed
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in
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.Pa /etc/ssh/ssh_prng_cmds .
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The output of each of the commands listed will be hashed and used to
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generate a random seed for the calling program.
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.Nm
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will also store seed files in
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.Pa ~/.ssh/prng_seed
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between executions.
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.Pp
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Alternately,
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.Nm
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may be configured at build time to collect random numbers from a
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EGD/PRNGd server via a unix domain or localhost tcp socket.
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.Pp
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This program is not intended to be run by the end-user, so the few
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commandline options are for debugging purposes only.
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.Bl -tag -width Ds
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.It Fl b Ar bytes
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Specify the number of random bytes to include in the output.
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.It Fl x
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Output a hexidecimal instead of a binary seed.
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.It Fl X
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Force output of a binary seed, even if standard output is a tty
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.It Fl v
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Turn on debugging message. Multiple
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.Fl v
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options will increase the debugging level.
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.It Fl h
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Display a summary of options.
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.El
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.Sh AUTHORS
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Damien Miller <djm@mindrot.org>
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.Sh SEE ALSO
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.Xr ssh 1 ,
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.Xr ssh-add 1 ,
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.Xr ssh-keygen 1 ,
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.Xr sshd 8
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