Import OpenSSH-8.8p1

vendor/openssh: upgrade from 8.0p1 to 8.3p1

Summary of notable changes:

- ssh(1), sshd(8), ssh-agent(1): add protection for private keys at
rest in RAM against speculation and memory side-channel

vendor/openssh: upgrade from 8.0p1 to 8.3p1

Summary of notable changes:

- ssh(1), sshd(8), ssh-agent(1): add protection for private keys at
rest in RAM against speculation and memory side-channel attacks like
Spectre, Meltdown and Rambleed, openssh 8.1 and later encrypts private
keys when they are not in use with a symmetric key that is derived from
a relatively large "prekey" consisting of random data (currently 16KB)

- ssh(1), sshd(8), ssh-keygen(1): openssh 8.2 removes the "ssh-rsa"
(RSA/SHA1) algorithm from those accepted for certificate signatures
(i.e. the client and server CASignatureAlgorithms option) and will
use the rsa-sha2-512 signature algorithm by default when the
ssh-keygen(1) CA signs new certificates

- ssh(1), sshd(8): openssh 8.2 removes diffie-hellman-group14-sha1 from
the default key exchange proposal for both the client and server

- ssh-keygen(1): the command-line options related to the generation and
screening of safe prime numbers used by the diffie-hellman-group-* key
exchange algorithms have changed, most options have been folded under
the -O flag

- support PKCS8 as an optional format for storage of private keys to disk,
native key format remains the default, but PKCS8 is a superior format to
PEM if interoperability with non-OpenSSH software is required

- ssh(1), sshd(8): prefer to use chacha20 from libcrypto

- sshd(8): the sshd listener process title visible to ps(1) has changed
to include information about the number of connections that are
currently attempting authentication and the limits configured
by MaxStartups

- sshd(8): when clients get denied by MaxStartups, send a notification
prior to the SSH2 protocol banner according to RFC4253 section 4.2

- sshd(8): add an Include sshd_config keyword that allows including
additional configuration files via glob(3) patterns

- sshd(8): make IgnoreRhosts a tri-state option: "yes" to ignore
rhosts/shosts, "no" allow rhosts/shosts or (new) "shosts-only"
to allow .shosts files but not .rhosts

- sshd(8): allow the IgnoreRhosts directive to appear anywhere in a
sshd_config, not just before any Match blocks

- ssh(1), sshd(8): allow prepending a list of algorithms to the default
set by starting the list with the '^' character, e.g.
"HostKeyAlgorithms ^ssh-ed25519"

- ssh(1): allow forwarding a different agent socket to the path specified
by $SSH_AUTH_SOCK, by extending the existing ForwardAgent option to
accepting an explicit path or the name of an environment variable in
addition to yes/no

- ssh(1): add %TOKEN percent expansion for the LocalFoward and
RemoteForward keywords when used for Unix domain socket forwarding

- ssh(1): allow %n to be expanded in ProxyCommand strings

- sftp(1): reject an argument of "-1" in the same way as ssh(1) and
scp(1) do instead of accepting and silently ignoring it

- sftp(1): check for user@host when parsing sftp target, this allows
user@[1.2.3.4] to work without a path

- sftp(1): fix a race condition in the SIGCHILD handler that could
turn in to a kill(-1)

For detailed list of all improvements, enhancements and bugfixes see
release notes:

https://www.openssh.com/releasenotes.html

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Import OpenSSH-8.0p1

Import OpenSSH-7.6p1

Import OpenSSH-7.3p1.

Import OpenSSH-6.7p1.

Import OpenSSH-6.1p1.

Features:

* ssh-keygen(1): Add optional checkpoints for moduli screening
* ssh-add(1): new -k option to load plain keys (skipping certificates)
* sshd(8): Add wildcard supp

Import OpenSSH-6.1p1.

Features:

* ssh-keygen(1): Add optional checkpoints for moduli screening
* ssh-add(1): new -k option to load plain keys (skipping certificates)
* sshd(8): Add wildcard support to PermitOpen, allowing things like
"PermitOpen localhost:*". bz #1857
* ssh(1): support for cancelling local and remote port forwards via the
multiplex socket. Use ssh -O cancel -L xx:xx:xx -R yy:yy:yy user@host"
to request the cancellation of the specified forwardings
* support cancellation of local/dynamic forwardings from ~C commandline
* sshd(8): This release turns on pre-auth sandboxing sshd by default for
new installs, by setting UsePrivilegeSeparation=sandbox in sshd_config.
* ssh-keygen(1): Add options to specify starting line number and number of
lines to process when screening moduli candidates, allowing processing
of different parts of a candidate moduli file in parallel
* sshd(8): The Match directive now supports matching on the local (listen)
address and port upon which the incoming connection was received via
LocalAddress and LocalPort clauses.
* sshd(8): Extend sshd_config Match directive to allow setting AcceptEnv
and {Allow,Deny}{Users,Groups}
* Add support for RFC6594 SSHFP DNS records for ECDSA key types. bz#1978
* ssh-keygen(1): Allow conversion of RSA1 keys to public PEM and PKCS8
* sshd(8): Allow the sshd_config PermitOpen directive to accept "none" as
an argument to refuse all port-forwarding requests.
* sshd(8): Support "none" as an argument for AuthorizedPrincipalsFile
* ssh-keyscan(1): Look for ECDSA keys by default. bz#1971
* sshd(8): Add "VersionAddendum" to sshd_config to allow server operators
to append some arbitrary text to the server SSH protocol banner.

Bugfixes:

* ssh(1): ensure that $DISPLAY contains only valid characters before
using it to extract xauth data so that it can't be used to play local
shell metacharacter games.
* ssh(1): unbreak remote portforwarding with dynamic allocated listen ports
* scp(1): uppress adding '--' to remote commandlines when the first
argument does not start with '-'. saves breakage on some
difficult-to-upgrade embedded/router platforms
* ssh(1)/sshd(8): fix typo in IPQoS parsing: there is no "AF14" class,
but there is an "AF21" class
* ssh(1)/sshd(8): do not permit SSH2_MSG_SERVICE_REQUEST/ACCEPT during
rekeying
* ssh(1): skip attempting to create ~/.ssh when -F is passed
* sshd(8): unbreak stdio forwarding when ControlPersist is in use; bz#1943
* sshd(1): send tty break to pty master instead of (probably already
closed) slave side; bz#1859
* sftp(1): silence error spam for "ls */foo" in directory with files;
bz#1683
* Fixed a number of memory and file descriptor leaks
* ssh(1)/sshd(8): Don't spin in accept() in situations of file
descriptor exhaustion. Instead back off for a while.
* ssh(1)/sshd(8): Remove hmac-sha2-256-96 and hmac-sha2-512-96 MACs as
they were removed from the specification. bz#2023,
* sshd(8): Handle long comments in config files better. bz#2025
* ssh(1): Delay setting tty_flag so RequestTTY options are correctly
picked up. bz#1995
* sshd(8): Fix handling of /etc/nologin incorrectly being applied to root
on platforms that use login_cap.

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Import OpenSSH-5.6p1.

Move openssh-5/ to openssh/. We don't need a versioned directory.