[ssh] add configuration file

.gitignore

@@ -260,3 +260,8 @@ Cache
 
 # swayimg
 !/.config/swayimg
+
+# ssh
+!/.ssh
+/.ssh/*
+!/.ssh/config

.shaliases

@@ -11,5 +11,3 @@ alias dns="dig +short"
 alias fm=clifm
 alias tb="nc termbin.com 9999"
 alias neovide="neovide --nofork"
-command -v doas > /dev/null && alias sudo=doas
-command -v direnv > /dev/null && alias doas="direnv exec ~ doas"

.ssh/config

@@ -0,0 +1,30 @@
+# ~/.ssh/config
+
+# Only use configured identities
+IdentitiesOnly yes
+
+# Automatically add keys to ssh-agent/gpg-agent
+AddKeysToAgent yes
+
+# Ensure gpg-agent is started
+Host * exec "gpg-connect-agent updatestartuptty /bye"
+
+# Client hardening config
+# https://www.ssh-audit.com/hardening_guides.html
+Host *
+ Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
+
+ KexAlgorithms sntrup761x25519-sha512@openssh.com,curve25519-sha256,curve25519-sha256@libssh.org,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha256
+
+ MACs hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,umac-128-etm@openssh.com
+
+ HostKeyAlgorithms sk-ssh-ed25519-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,sk-ssh-ed25519@openssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256
+
+ CASignatureAlgorithms sk-ssh-ed25519@openssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256
+
+ HostbasedAcceptedAlgorithms sk-ssh-ed25519-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,sk-ssh-ed25519@openssh.com,ssh-ed25519,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256-cert-v01@openssh.com,rsa-sha2-256
+
+ PubkeyAcceptedAlgorithms sk-ssh-ed25519-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,sk-ssh-ed25519@openssh.com,ssh-ed25519,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256-cert-v01@openssh.com,rsa-sha2-256
+
+# Custom hosts configuration
+Include "~/.ssh/hosts.conf"