update sshd_config from Arch

OpenSSH 7.1p1-1

Note the sftp subsystem which differs between at least Debian and Arch.

etc/ssh/sshd_config

@@ -1,13 +1,23 @@
-# See the sshd_config(5) manpage for details
+#   $OpenBSD: sshd_config,v 1.97 2015/08/06 14:53:21 deraadt Exp $
+
+# 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
-#Port 443
-#Port 10000
-
-# Use these options to restrict which interfaces/protocols sshd will bind to
-ListenAddress ::
+AddressFamily any
 ListenAddress 0.0.0.0
+ListenAddress ::
+
+# The default requires explicit activation of protocol 1
 Protocol 2
+
 # HostKeys for protocol version 2
 HostKey /etc/ssh/ssh_host_rsa_key
 HostKey /etc/ssh/ssh_host_ecdsa_key
@@ -18,70 +28,71 @@ HostKey /etc/ssh/ssh_host_ed25519_key
 # ssh-keygen -t ecdsa -N "" -f /etc/ssh/ssh_host_ecdsa_key
 # ssh-keygen -t ed25519 -N "" -f /etc/ssh/ssh_host_ed25519_key
 
-#Privilege Separation is turned on for security
-UsePrivilegeSeparation yes
+# Uncomment one of the following depending on which OS
+## Arch
+#Subsystem   sftp    /usr/lib/ssh/sftp-server
+## Debian
+#Subsystem sftp /usr/lib/openssh/sftp-server
 
 # Lifetime and size of ephemeral version 1 server key
-KeyRegenerationInterval 3600
-ServerKeyBits 1024
+#KeyRegenerationInterval 1h
+#ServerKeyBits 1024
+
+# Ciphers and keying
+#RekeyLimit default none
 
 # Logging
-SyslogFacility AUTH
+# obsoletes QuietMode and FascistLogging
+#SyslogFacility AUTH
 LogLevel VERBOSE
 
 # Authentication:
-LoginGraceTime 120
-PermitRootLogin without-password
-StrictModes yes
 
-RSAAuthentication yes
-PubkeyAuthentication yes
-#AuthorizedKeysFile %h/.ssh/authorized_keys
+#LoginGraceTime 2m
+PermitRootLogin prohibit-password
+#StrictModes yes
+#MaxAuthTries 6
+#MaxSessions 10
 
-# 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
+#RSAAuthentication yes
+#PubkeyAuthentication yes
+
+# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
+# but this is overridden so installations will only check .ssh/authorized_keys
+AuthorizedKeysFile  .ssh/authorized_keys
+
+#AuthorizedPrincipalsFile none
+
+#AuthorizedKeysCommand none
+#AuthorizedKeysCommandUser nobody
+
+# For this to work you will also need host keys in /etc/ssh/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
+#HostbasedAuthentication no
+# Change to yes if you don't trust ~/.ssh/known_hosts for
+# RhostsRSAAuthentication and HostbasedAuthentication
+#IgnoreUserKnownHosts no
+# Don't read the user's ~/.rhosts and ~/.shosts files
+#IgnoreRhosts yes
 
-# To enable empty passwords, change to yes (NOT RECOMMENDED)
-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
+# To disable tunneled clear text passwords, change to no here!
 PasswordAuthentication no
+#PermitEmptyPasswords no
+
+# Change to no to disable s/key passwords
+ChallengeResponseAuthentication 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
-
 # 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
@@ -92,3 +103,35 @@ Subsystem sftp /usr/lib/openssh/sftp-server
 # PAM authentication, then enable this but set PasswordAuthentication
 # and ChallengeResponseAuthentication to 'no'.
 UsePAM yes
+
+#AllowAgentForwarding yes
+#AllowTcpForwarding yes
+#GatewayPorts no
+#X11Forwarding no
+#X11DisplayOffset 10
+#X11UseLocalhost yes
+#PermitTTY yes
+PrintMotd no # pam does that
+#PrintLastLog yes
+#TCPKeepAlive yes
+#UseLogin no
+UsePrivilegeSeparation sandbox      # Default for new installations.
+#PermitUserEnvironment no
+#Compression delayed
+#ClientAliveInterval 0
+#ClientAliveCountMax 3
+#UseDNS no
+#PidFile /run/sshd.pid
+#MaxStartups 10:30:100
+#PermitTunnel no
+#ChrootDirectory none
+#VersionAddendum none
+
+Banner /etc/issue
+
+# Example of overriding settings on a per-user basis
+#Match User anoncvs
+#   X11Forwarding no
+#   AllowTcpForwarding no
+#   PermitTTY no
+#   ForceCommand cvs server