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.

Upgrade to OpenSSH-5.2p1.

Security:

* This release changes the default cipher order to prefer the AES CTR
modes and the revised "arcfour256" mode to CBC mode ciphers that are
susceptible to

Upgrade to OpenSSH-5.2p1.

Security:

* This release changes the default cipher order to prefer the AES CTR
modes and the revised "arcfour256" mode to CBC mode ciphers that are
susceptible to CPNI-957037 "Plaintext Recovery Attack Against SSH".

* This release also adds countermeasures to mitigate CPNI-957037-style
attacks against the SSH protocol's use of CBC-mode ciphers. Upon
detection of an invalid packet length or Message Authentication
Code, ssh/sshd will continue reading up to the maximum supported
packet length rather than immediately terminating the connection.
This eliminates most of the known differences in behaviour that
leaked information about the plaintext of injected data which formed
the basis of this attack. We believe that these attacks are rendered
infeasible by these changes.

New features:

* Added a -y option to ssh(1) to force logging to syslog rather than
stderr, which is useful when running daemonised (ssh -f)

* The sshd_config(5) ForceCommand directive now accepts commandline
arguments for the internal-sftp server.

* The ssh(1) ~C escape commandline now support runtime creation of
dynamic (-D) port forwards.

* Support the SOCKS4A protocol in ssh(1) dynamic (-D) forwards.
(bz#1482)

* Support remote port forwarding with a listen port of '0'. This
informs the server that it should dynamically allocate a listen
port and report it back to the client. (bz#1003)

* sshd(8) now supports setting PermitEmptyPasswords and
AllowAgentForwarding in Match blocks

Bug and documentation fixes

* Repair a ssh(1) crash introduced in openssh-5.1 when the client is
sent a zero-length banner (bz#1496)

* Due to interoperability problems with certain
broken SSH implementations, the eow@openssh.com and
no-more-sessions@openssh.com protocol extensions are now only sent
to peers that identify themselves as OpenSSH.

* Make ssh(1) send the correct channel number for
SSH2_MSG_CHANNEL_SUCCESS and SSH2_MSG_CHANNEL_FAILURE messages to
avoid triggering 'Non-public channel' error messages on sshd(8) in
openssh-5.1.

* Avoid printing 'Non-public channel' warnings in sshd(8), since the
ssh(1) has sent incorrect channel numbers since ~2004 (this reverts
a behaviour introduced in openssh-5.1).

* Avoid double-free in ssh(1) ~C escape -L handler (bz#1539)

* Correct fail-on-error behaviour in sftp(1) batchmode for remote
stat operations. (bz#1541)

* Disable nonfunctional ssh(1) ~C escape handler in multiplex slave
connections. (bz#1543)

* Avoid hang in ssh(1) when attempting to connect to a server that
has MaxSessions=0 set.

* Multiple fixes to sshd(8) configuration test (-T) mode

* Several core and portable OpenSSH bugs fixed: 1380, 1412, 1418,
1419, 1421, 1490, 1491, 1492, 1514, 1515, 1518, 1520, 1538, 1540

* Many manual page improvements.

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