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94 lines
2.9 KiB
Groff
94 lines
2.9 KiB
Groff
.\" $OpenBSD: ssh-keysign.8,v 1.16 2019/11/30 07:07:59 jmc Exp $
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.\"
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.\" Copyright (c) 2002 Markus Friedl. 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 $Mdocdate: November 30 2019 $
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.Dt SSH-KEYSIGN 8
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.Os
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.Sh NAME
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.Nm ssh-keysign
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.Nd OpenSSH helper for host-based authentication
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.Sh SYNOPSIS
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.Nm
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.Sh DESCRIPTION
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.Nm
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is used by
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.Xr ssh 1
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to access the local host keys and generate the digital signature
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required during host-based authentication.
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.Pp
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.Nm
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is disabled by default and can only be enabled in the
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global client configuration file
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.Pa /etc/ssh/ssh_config
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by setting
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.Cm EnableSSHKeysign
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to
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.Dq yes .
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.Pp
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.Nm
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is not intended to be invoked by the user, but from
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.Xr ssh 1 .
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See
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.Xr ssh 1
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and
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.Xr sshd 8
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for more information about host-based authentication.
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.Sh FILES
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.Bl -tag -width Ds -compact
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.It Pa /etc/ssh/ssh_config
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Controls whether
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.Nm
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is enabled.
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.Pp
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.It Pa /etc/ssh/ssh_host_dsa_key
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.It Pa /etc/ssh/ssh_host_ecdsa_key
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.It Pa /etc/ssh/ssh_host_ed25519_key
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.It Pa /etc/ssh/ssh_host_rsa_key
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These files contain the private parts of the host keys used to
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generate the digital signature.
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They should be owned by root, readable only by root, and not
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accessible to others.
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Since they are readable only by root,
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.Nm
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must be set-uid root if host-based authentication is used.
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.Pp
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.It Pa /etc/ssh/ssh_host_dsa_key-cert.pub
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.It Pa /etc/ssh/ssh_host_ecdsa_key-cert.pub
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.It Pa /etc/ssh/ssh_host_ed25519_key-cert.pub
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.It Pa /etc/ssh/ssh_host_rsa_key-cert.pub
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If these files exist they are assumed to contain public certificate
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information corresponding with the private keys above.
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.El
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.Sh SEE ALSO
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.Xr ssh 1 ,
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.Xr ssh-keygen 1 ,
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.Xr ssh_config 5 ,
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.Xr sshd 8
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.Sh HISTORY
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.Nm
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first appeared in
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.Ox 3.2 .
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.Sh AUTHORS
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.An Markus Friedl Aq Mt markus@openbsd.org
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