freebsd-dev/crypto/openssh/ssh-sk-helper.8
Ed Maste 19261079b7 openssh: update to OpenSSH v8.7p1
Some notable changes, from upstream's release notes:

- sshd(8): Remove support for obsolete "host/port" syntax.
- ssh(1): When prompting whether to record a new host key, accept the key
  fingerprint as a synonym for "yes".
- ssh-keygen(1): when acting as a CA and signing certificates with an RSA
  key, default to using the rsa-sha2-512 signature algorithm.
- ssh(1), sshd(8), ssh-keygen(1): this release removes the "ssh-rsa"
  (RSA/SHA1) algorithm from those accepted for certificate signatures.
- ssh-sk-helper(8): this is a new binary. It is used by the FIDO/U2F
  support to provide address-space isolation for token middleware
  libraries (including the internal one).
- ssh(1): this release enables UpdateHostkeys by default subject to some
  conservative preconditions.
- scp(1): this release changes the behaviour of remote to remote copies
  (e.g. "scp host-a:/path host-b:") to transfer through the local host
  by default.
- scp(1): experimental support for transfers using the SFTP protocol as
  a replacement for the venerable SCP/RCP protocol that it has
  traditionally used.

Additional integration work is needed to support FIDO/U2F in the base
system.

Deprecation Notice
------------------

OpenSSH will disable the ssh-rsa signature scheme by default in the
next release.

Reviewed by:	imp
MFC after:	1 month
Relnotes:	Yes
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D29985
2021-09-07 21:05:51 -04:00

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Groff

.\" $OpenBSD: ssh-sk-helper.8,v 1.3 2019/12/21 20:22:34 naddy Exp $
.\"
.\" Copyright (c) 2010 Markus Friedl. All rights reserved.
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: December 21 2019 $
.Dt SSH-SK-HELPER 8
.Os
.Sh NAME
.Nm ssh-sk-helper
.Nd OpenSSH helper for FIDO authenticator support
.Sh SYNOPSIS
.Nm
.Op Fl v
.Sh DESCRIPTION
.Nm
is used by
.Xr ssh-agent 1
to access keys provided by a FIDO authenticator.
.Pp
.Nm
is not intended to be invoked by the user, but from
.Xr ssh-agent 1 .
.Pp
A single option is supported:
.Bl -tag -width Ds
.It Fl v
Verbose mode.
Causes
.Nm
to print debugging messages about its progress.
This is helpful in debugging problems.
Multiple
.Fl v
options increase the verbosity.
The maximum is 3.
.Pp
Note that
.Xr ssh-agent 1
will automatically pass the
.Fl v
flag to
.Nm
when it has itself been placed in debug mode.
.El
.Sh SEE ALSO
.Xr ssh 1 ,
.Xr ssh-add 1 ,
.Xr ssh-agent 1
.Sh HISTORY
.Nm
first appeared in
.Ox 6.7 .
.Sh AUTHORS
.An Damien Miller Aq Mt djm@openbsd.org