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![Ed Maste](/assets/img/avatar_default.png)
Release notes are available at https://www.openssh.com/txt/release-9.0 Some highlights: * ssh(1), sshd(8): use the hybrid Streamlined NTRU Prime + x25519 key exchange method by default ("sntrup761x25519-sha512@openssh.com"). The NTRU algorithm is believed to resist attacks enabled by future quantum computers and is paired with the X25519 ECDH key exchange (the previous default) as a backstop against any weaknesses in NTRU Prime that may be discovered in the future. The combination ensures that the hybrid exchange offers at least as good security as the status quo. * sftp-server(8): support the "copy-data" extension to allow server- side copying of files/data, following the design in draft-ietf-secsh-filexfer-extensions-00. bz2948 * sftp(1): add a "cp" command to allow the sftp client to perform server-side file copies. This commit excludes the scp(1) change to use the SFTP protocol by default; that change will immediately follow. MFC after: 1 month Relnotes: Yes Sponsored by: The FreeBSD Foundation
94 lines
2.9 KiB
Groff
94 lines
2.9 KiB
Groff
.\" $OpenBSD: ssh-keysign.8,v 1.17 2022/03/31 17:27:27 naddy 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: March 31 2022 $
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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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