shell-things/etc/ssh/ssh_config

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# This works as a /etc/ssh/ssh_config or ~/.ssh/config like how I keep
# using it. Higher option takes priority (keep `Host *` bottom)
# User specific configs
Include ~/.ssh/config.d/*.conf
# Debian includes this
Include /etc/ssh/ssh_config.d/*.conf
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Host *
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# Path for the control socket.
ControlPath ~/.ssh/sockets/socket-%r@%h:%p
# Multiple sessions over single connection
ControlMaster yes
# Keep connection open in the background even after connection has been
# closed.
ControlPersist yes
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# SSH Agent forwarding is behind a lot of security breaches, never do it
# Most recently https://github.com/matrix-org/matrix.org/issues/371
ForwardAgent no
# Never do that either https://security.stackexchange.com/a/14817/234532
ForwardX11 no
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# Debian sets this as yes, upstream no. TODO: What is it?
#GSSAPIAuthentication yes
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# Ensure KnownHosts are unreadable if leaked.
HashKnownHosts yes
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LogLevel VERBOSE
Protocol 2
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# Tor through openbsd netcat (Fedora: netcat)
#ProxyCommand netcat -X 5 -x localhost:9050 %h %p
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# Always try public key authentication.
PubkeyAuthentication yes
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# Send needed environment variables. I don't like setting wildcards
# and LC_ALL is disabled on purpouse.
SendEnv EDITOR LANG LANGUAGE LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT LC_IDENTIFICATION TERM TZ
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# "ssh will automatically add new host keys to the user's known_hosts file, but will not permit connections to hosts with changed host keys."
StrictHostKeyChecking accept-new
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# If the server doesn't reply in three "pings", connection is dead.
# Defaults to 3 anyway, but I add it here for clearity and
# in case it decides to change in the future.
ServerAliveCountMax 3
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# "ping" the server every minute.
ServerAliveInterval 60
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# OpenSSH 6.8+ - ask all host keys from servers.
# I trust the server admins and ways to identify the keys (DNSSEC,
# manual).
UpdateHostKeys yes
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# Verify SSHFP records. If this is yes, the question is skipped when
# DNSSEC is used, but apparently only "ask" and "no" write known_hosts
# However with "ask" you won't be told whether the zone is signed, so
# I consider "yes" to be the least evil.
VerifyHostKeyDNS yes
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# Display key ascii art on connection. Makes noticing changed keys easier,
# although it's ambiguous and similar pattern may go past unnoticed.
VisualHostKey yes