Use a more generic sshd_config with our options.

ubuntu/roles/common/files/sshd_config

@@ -1,80 +1,76 @@
-# Package generated configuration file
-# See the sshd_config(5) manpage for details
+#	$OpenBSD: sshd_config,v 1.101 2017/03/14 07:19:07 djm Exp $
 
-# What ports, IPs and protocols we listen for
-Port 22
-# Use these options to restrict which interfaces/protocols sshd will bind to
-#ListenAddress ::
+# This is the sshd server system-wide configuration file.  See
+# sshd_config(5) for more information.
+
+# This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin
+
+# The strategy used for options in the default sshd_config shipped with
+# OpenSSH is to specify options with their default value where
+# possible, but leave them commented.  Uncommented options override the
+# default value.
+
+#Port 22
+#AddressFamily any
 #ListenAddress 0.0.0.0
-Protocol 2
-# HostKeys for protocol version 2
-HostKey /etc/ssh/ssh_host_rsa_key
-HostKey /etc/ssh/ssh_host_dsa_key
-HostKey /etc/ssh/ssh_host_ecdsa_key
-HostKey /etc/ssh/ssh_host_ed25519_key
-#Privilege Separation is turned on for security
-UsePrivilegeSeparation yes
+#ListenAddress ::
 
-# Lifetime and size of ephemeral version 1 server key
-KeyRegenerationInterval 3600
-ServerKeyBits 1024
+#HostKey /etc/ssh/ssh_host_rsa_key
+#HostKey /etc/ssh/ssh_host_ecdsa_key
+#HostKey /etc/ssh/ssh_host_ed25519_key
+
+# Ciphers and keying
+#RekeyLimit default none
 
 # Logging
-SyslogFacility AUTH
-LogLevel INFO
+#SyslogFacility AUTH
+#LogLevel INFO
 
 # Authentication:
-LoginGraceTime 120
+
+#LoginGraceTime 2m
 PermitRootLogin without-password
-StrictModes yes
+#StrictModes yes
+#MaxAuthTries 6
+#MaxSessions 10
 
-RSAAuthentication yes
-PubkeyAuthentication yes
-#AuthorizedKeysFile	%h/.ssh/authorized_keys
+#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
+# Change to yes if you don't trust ~/.ssh/known_hosts for
+# HostbasedAuthentication
+#IgnoreUserKnownHosts no
 # Don't read the user's ~/.rhosts and ~/.shosts files
-IgnoreRhosts yes
-# For this to work you will also need host keys in /etc/ssh_known_hosts
-RhostsRSAAuthentication no
-# similar for protocol version 2
-HostbasedAuthentication no
-# Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication
-#IgnoreUserKnownHosts yes
+#IgnoreRhosts yes
 
-# To enable empty passwords, change to yes (NOT RECOMMENDED)
-PermitEmptyPasswords no
+# To disable tunneled clear text passwords, change to no here!
+PasswordAuthentication no
+#PermitEmptyPasswords no
 
 # Change to yes to enable challenge-response passwords (beware issues with
 # some PAM modules and threads)
 ChallengeResponseAuthentication no
 
-# Change to no to disable tunnelled clear text passwords
-PasswordAuthentication no
-
 # Kerberos options
 #KerberosAuthentication no
-#KerberosGetAFSToken no
 #KerberosOrLocalPasswd yes
 #KerberosTicketCleanup yes
+#KerberosGetAFSToken no
 
 # GSSAPI options
 #GSSAPIAuthentication no
 #GSSAPICleanupCredentials yes
-
-X11Forwarding yes
-X11DisplayOffset 10
-PrintMotd no
-PrintLastLog yes
-TCPKeepAlive yes
-#UseLogin no
-
-#MaxStartups 10:30:60
-#Banner /etc/issue.net
-
-# Allow client to pass locale environment variables
-AcceptEnv LANG LC_*
-
-Subsystem sftp /usr/lib/openssh/sftp-server
+#GSSAPIStrictAcceptorCheck yes
+#GSSAPIKeyExchange no
 
 # Set this to 'yes' to enable PAM authentication, account processing,
 # and session processing. If this is enabled, PAM authentication will
@@ -87,3 +83,40 @@ Subsystem sftp /usr/lib/openssh/sftp-server
 # and ChallengeResponseAuthentication to 'no'.
 UsePAM yes
 
+#AllowAgentForwarding yes
+#AllowTcpForwarding yes
+#GatewayPorts no
+X11Forwarding yes
+#X11DisplayOffset 10
+#X11UseLocalhost yes
+#PermitTTY yes
+PrintMotd no
+#PrintLastLog yes
+#TCPKeepAlive yes
+#UseLogin no
+#PermitUserEnvironment no
+#Compression delayed
+#ClientAliveInterval 0
+#ClientAliveCountMax 3
+#UseDNS no
+#PidFile /var/run/sshd.pid
+#MaxStartups 10:30:100
+#PermitTunnel no
+#ChrootDirectory none
+#VersionAddendum none
+
+# no default banner path
+#Banner none
+
+# 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