add sshd

etc/ssh/sshd_config

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+# OpenSSH rugged config
+
+# listen on ssh port, security is not "choice another port"
+Port 22
+
+# ipv6 only
+AddressFamily inet6
+ListenAddress ::
+
+# ed25519 only
+HostKey /etc/ssh/ssh_host_ed25519_key
+
+# SSH CA
+TrustedUserCAKeys /etc/ssh/ca-vault.pem
+
+# Cipher and algorithms
+KexAlgorithms curve25519-sha256@libssh.org
+Ciphers chacha20-poly1305@openssh.com
+MACs hmac-sha2-512-etm@openssh.com
+
+# Logging
+SyslogFacility AUTH
+LogLevel INFO
+
+# Authentication
+LoginGraceTime 10s
+PermitRootLogin prohibit-password
+StrictModes yes
+MaxAuthTries 2
+MaxSessions 10
+
+# Allow publickey
+PubkeyAuthentication yes
+
+# Expect .ssh/authorized_keys2 to be disregarded by default in future.
+#AuthorizedKeysFile	.ssh/authorized_keys .ssh/authorized_keys2
+
+#AuthorizedPrincipalsFile none
+
+#AuthorizedKeysCommand none
+#AuthorizedKeysCommandUser nobody
+
+# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
+HostbasedAuthentication no
+# Don't read the user's ~/.rhosts and ~/.shosts files
+IgnoreRhosts yes
+
+# To disable tunneled clear text passwords, change to no here!
+#PasswordAuthentication yes
+#PermitEmptyPasswords no
+
+# Change to yes to enable challenge-response passwords (beware issues with
+# some PAM modules and threads)
+ChallengeResponseAuthentication no
+
+# Kerberos options
+KerberosAuthentication no
+#KerberosOrLocalPasswd yes
+#KerberosTicketCleanup yes
+#KerberosGetAFSToken no
+
+# GSSAPI options
+GSSAPIAuthentication no
+#GSSAPICleanupCredentials yes
+#GSSAPIStrictAcceptorCheck yes
+#GSSAPIKeyExchange no
+
+# Set this to 'yes' to enable PAM authentication, account processing,
+# and session processing. If this is enabled, PAM authentication will
+# be allowed through the ChallengeResponseAuthentication and
+# PasswordAuthentication.  Depending on your PAM configuration,
+# PAM authentication via ChallengeResponseAuthentication may bypass
+# the setting of "PermitRootLogin without-password".
+# If you just want the PAM account and session checks to run without
+# PAM authentication, then enable this but set PasswordAuthentication
+# and ChallengeResponseAuthentication to 'no'.
+UsePAM yes
+
+#AllowAgentForwarding yes
+#AllowTcpForwarding yes
+#GatewayPorts no
+#X11DisplayOffset 10
+#X11UseLocalhost yes
+#PermitTTY yes
+#PrintLastLog yes
+#TCPKeepAlive yes
+#PermitUserEnvironment no
+#Compression delayed
+#ClientAliveInterval 0
+#ClientAliveCountMax 3
+#PidFile /var/run/sshd.pid
+#PermitTunnel no
+#ChrootDirectory none
+
+MaxStartups 10:30:100
+X11Forwarding no
+UseDNS no
+PrintMotd no
+VersionAddendum none
+
+# no default banner path
+Banner none
+DebianBanner no
+
+# Allow client to pass locale environment variables
+AcceptEnv LANG LC_*
+
+# override default of no subsystems
+Subsystem	sftp	/usr/lib/openssh/sftp-server
+
+# Example of overriding settings on a per-user basis
+#Match User anoncvs
+#	X11Forwarding no
+#	AllowTcpForwarding no
+#	PermitTTY no
+#	ForceCommand cvs server