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Highlights from the release notes are reproduced below. Some security and bug fixes were previously merged into FreeBSD and have been elided. See the upstream release notes for full details (https://www.openssh.com/releasenotes.html). --- Future deprecation notice ========================= OpenSSH plans to remove support for the DSA signature algorithm in early 2025. Potentially-incompatible changes -------------------------------- * sshd(8): the server will now block client addresses that repeatedly fail authentication, repeatedly connect without ever completing authentication or that crash the server. See the discussion of PerSourcePenalties below for more information. Operators of servers that accept connections from many users, or servers that accept connections from addresses behind NAT or proxies may need to consider these settings. * sshd(8): the server has been split into a listener binary, sshd(8), and a per-session binary "sshd-session". This allows for a much smaller listener binary, as it no longer needs to support the SSH protocol. As part of this work, support for disabling privilege separation (which previously required code changes to disable) and disabling re-execution of sshd(8) has been removed. Further separation of sshd-session into additional, minimal binaries is planned for the future. * sshd(8): several log messages have changed. In particular, some log messages will be tagged with as originating from a process named "sshd-session" rather than "sshd". * ssh-keyscan(1): this tool previously emitted comment lines containing the hostname and SSH protocol banner to standard error. This release now emits them to standard output, but adds a new "-q" flag to silence them altogether. * sshd(8): (portable OpenSSH only) sshd will no longer use argv[0] as the PAM service name. A new "PAMServiceName" sshd_config(5) directive allows selecting the service name at runtime. This defaults to "sshd". bz2101 New features ------------ * sshd(8): sshd(8) will now penalise client addresses that, for various reasons, do not successfully complete authentication. This feature is controlled by a new sshd_config(5) PerSourcePenalties option and is on by default. * ssh(8): allow the HostkeyAlgorithms directive to disable the implicit fallback from certificate host key to plain host keys. Portability ----------- * sshd(8): expose SSH_AUTH_INFO_0 always to PAM auth modules unconditionally. The previous behaviour was to expose it only when particular authentication methods were in use. * ssh(1), ssh-agent(8): allow the presence of the WAYLAND_DISPLAY environment variable to enable SSH_ASKPASS, similarly to the X11 DISPLAY environment variable. GHPR479 --- Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D48914 (cherry picked from commit 0fdf8fae8b569bf9fff3b5171e669dcd7cf9c79e) (cherry picked from commit b4bb480ae9294d7e4b375f0ead9ae57517c79ef3) (cherry picked from commit e95979047aec384852102cf8bb1d55278ea77eeb) (cherry picked from commit dcb4ae528d357f34e4a4b4882c2757c67c98e395) Approved by: re (accelerated MFC)
91 lines
2.9 KiB
Groff
91 lines
2.9 KiB
Groff
.\" $OpenBSD: ssh-keysign.8,v 1.18 2024/06/17 08:30:29 djm 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: June 17 2024 $
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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_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_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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