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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openssh: diff reduction against upstream 7.9p1

Clean up whitespace and nonfunctional differences, and unused functions.

(cherry picked from commit 6eac665c8126af387a457ee8a08303c6607a6769)

openssh: simplify login class restrictions

Login class-based restrictions were introduced in 5b400a39b8ad. The
code was adapted for sshd's Capsicum sandbox and received many changes
over time, incl

openssh: simplify login class restrictions

Login class-based restrictions were introduced in 5b400a39b8ad. The
code was adapted for sshd's Capsicum sandbox and received many changes
over time, including at least fc3c19a9fcee, bd393de91cc3, and
e8c56fba2926.

During an attempt to upstream the work a much simpler approach was
suggested. Adopt it now in the in-tree OpenSSH to reduce conflicts with
future updates.

Submitted by: Yuchiro Naito (against OpenSSH-portable on GitHub)
Obtained from: https://github.com/openssh/openssh-portable/pull/262
Reviewed by: allanjude, kevans
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D31760

(cherry picked from commit 27ceebbc2402e4c98203c7eef9696f4bd3d326f8)

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Fix portability issues with the Capsicum patch committed in r339216:

- Wrap access to pw_change and pw_expire in the appropriate #ifdefs.
- Wrap calls to login_cap(3) API in appropriate #ifdefs.
- A

Fix portability issues with the Capsicum patch committed in r339216:

- Wrap access to pw_change and pw_expire in the appropriate #ifdefs.
- Wrap calls to login_cap(3) API in appropriate #ifdefs.
- Add wrapper for transferring time_t, which is still only 32 bits wide
on FreeBSD i386.
- Use a temporary variable to deserialize size_t.

Approved by: re (gjb)

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sshd: address capsicum issues

* Add a wrapper to proxy login_getpwclass(3) as it is not allowed in
capability mode.
* Cache timezone data via caph_cache_tzdata() as we cannot access the
timezone

sshd: address capsicum issues

* Add a wrapper to proxy login_getpwclass(3) as it is not allowed in
capability mode.
* Cache timezone data via caph_cache_tzdata() as we cannot access the
timezone file.
* Reverse resolve hostname before entering capability mode.

PR: 231172
Submitted by: [email protected]
Reviewed by: cem, des
Approved by: re (rgrimes)
MFC after: 3 weeks
Differential Revision: https://reviews.freebsd.org/D17128

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