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 ho

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

(cherry picked from commit 19261079b74319502c6ffa1249920079f0f69a72)
(cherry picked from commit f448c3ed4ae1281861913a56377f9d93d49f8e8e)
(cherry picked from commit 1f290c707a19d1695c303e6c8ead9cc414ccc6dc)
(cherry picked from commit 0f9bafdfc325779e4ecc5154d5bb06c752297138)
(cherry picked from commit adb56e58e8db84d8087ebe3d3e7def0074cb5a90)
(cherry picked from commit 576b58108c1723c85e4dd00355e29bfe301dab11)
(cherry picked from commit 1c99af1ebe61cbaf633792941640dcd254acf921)
(cherry picked from commit 87152f34054921632016bc5eb4ab9f836fbaa522)
(cherry picked from commit 172fa4aa7577915bf5ace5783251821d3774dc05)

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Remove RCS tags from files in which we no longer have any local
modifications, and add them to two files in which we do.

As previously threatened, remove the HPN patch from OpenSSH.

Remove /* $FreeBSD$ */ from files that already have __RCSID("$FreeBSD$").

Add a pre-merge script which reverts mechanical changes such as added
$FreeBSD$ tags and man page dates.

Add a post-merge script which reapplies these changes.

Run both scripts to normalize the exi

Add a pre-merge script which reverts mechanical changes such as added
$FreeBSD$ tags and man page dates.

Add a post-merge script which reapplies these changes.

Run both scripts to normalize the existing code base. As a result, many
files which should have had $FreeBSD$ tags but didn't now have them.

Partly rewrite the upgrade instructions and remove the now outdated
list of tricks.

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Add support for dynamically adjusted buffers to allow the full use of
the bandwidth of long fat pipes (i.e. 100Mbps+ trans-oceanic or
trans-continental links). Bandwidth-delay products up to 64MB ar

Add support for dynamically adjusted buffers to allow the full use of
the bandwidth of long fat pipes (i.e. 100Mbps+ trans-oceanic or
trans-continental links). Bandwidth-delay products up to 64MB are
supported.

Also add support (not compiled by default) for the None cypher. The
None cypher can only be enabled on non-interactive sessions (those
without a pty where -T was not used) and must be enabled in both
the client and server configuration files and on the client command
line. Additionally, the None cypher will only be activated after
authentication is complete. To enable the None cypher you must add
-DNONE_CIPHER_ENABLED to CFLAGS via the make command line or in
/etc/make.conf.

This code is a style(9) compliant version of these features extracted
from the patches published at:

http://www.psc.edu/networking/projects/hpn-ssh/

Merging this patch has been a collaboration between me and Bjoern.

Reviewed by: bz
Approved by: re (kib), des (maintainer)

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MFH OpenSSH 5.4p1

Resolve conflicts.

Vendor import of OpenSSH 4.5p1.

Merge conflicts.

MFC after: 1 week

Vendor import of OpenSSH 4.4p1.

Merge conflicts.

Vendor import of OpenSSH 4.3p1.

Resolve conflicts.

Vendor import of OpenSSH 4.2p1.

Resolve conflicts

Vendor import of OpenSSH 3.9p1.

Resolve conflicts.

Vendor import of OpenSSH 3.8p1.

Resolve conflicts and remove obsolete files.

Sponsored by: registrar.no

Vendor import of OpenSSH 3.7.1p2.

Remove RCSID from files which have no other diffs to the vendor branch.

Resolve conflicts.

Vendor import of OpenSSH-portable 3.6.1p1.

Resolve conflicts.