Update sshd_config with current alpine version

Signed-off-by: Knut Ahlers <knut@ahlers.me>

sshd_config

@@ -1,54 +1,128 @@
-# What ports, IPs and protocols we listen for
+#       $OpenBSD: sshd_config,v 1.101 2017/03/14 07:19:07 djm Exp $
+
+# This is the sshd server system-wide configuration file.  See
+# sshd_config(5) for more information.
+
+# This sshd was compiled with PATH=/bin:/usr/bin:/sbin:/usr/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
-# Use these options to restrict which interfaces/protocols sshd will bind to
-#ListenAddress ::
+#AddressFamily any
 #ListenAddress 0.0.0.0
-Protocol 2
-# HostKeys for protocol version 2
+#ListenAddress ::
+
 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
 
+# Ciphers and keying
+#RekeyLimit default none
+
 # Logging
-SyslogFacility AUTH
-LogLevel INFO
+#SyslogFacility AUTH
+#LogLevel INFO
 
 # Authentication:
-LoginGraceTime 120
+
+LoginGraceTime 2m
 PermitRootLogin no
 StrictModes yes
+#MaxAuthTries 6
+#MaxSessions 10
 
 PubkeyAuthentication yes
-#AuthorizedKeysFile	%h/.ssh/authorized_keys
 
-# Don't read the user's ~/.rhosts and ~/.shosts files
-IgnoreRhosts yes
-# similar for protocol version 2
+# 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
 HostbasedAuthentication no
-# Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication
-#IgnoreUserKnownHosts yes
+# 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
 
-# To enable empty passwords, change to yes (NOT RECOMMENDED)
+# 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
+# Change to no to disable s/key passwords
+#ChallengeResponseAuthentication yes
 
-# Change to no to disable tunnelled clear text passwords
-PasswordAuthentication yes
+# Kerberos options
+#KerberosAuthentication no
+#KerberosOrLocalPasswd yes
+#KerberosTicketCleanup yes
+#KerberosGetAFSToken no
 
+# GSSAPI options
+#GSSAPIAuthentication no
+#GSSAPICleanupCredentials yes
+
+# 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 no
+
+AllowAgentForwarding no
+AllowTcpForwarding no
+#GatewayPorts no
 X11Forwarding no
-X11DisplayOffset 10
+#X11DisplayOffset 10
+#X11UseLocalhost yes
+#PermitTTY yes
 PrintMotd no
-TCPKeepAlive yes
+#PrintLastLog yes
+#TCPKeepAlive yes
 #UseLogin no
+#PermitUserEnvironment no
+#Compression delayed
+#ClientAliveInterval 0
+#ClientAliveCountMax 3
+#UseDNS no
+#PidFile /run/sshd.pid
+#MaxStartups 10:30:100
+#PermitTunnel no
+#ChrootDirectory none
+#VersionAddendum none
 
-#MaxStartups 10:30:60
-#Banner /etc/issue.net
+# 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/ssh/sftp-server
 
-Subsystem sftp /usr/lib/ssh/sftp-server
+# the following are HPN related configuration options
+# tcp receive buffer polling. disable in non autotuning kernels
+#TcpRcvBufPoll yes
+
+# disable hpn performance boosts
+#HPNDisabled no
+
+# buffer size for hpn to non-hpn connections
+#HPNBufferSize 2048
+
+# Example of overriding settings on a per-user basis
+#Match User anoncvs
+#       X11Forwarding no
+#       AllowTcpForwarding no
+#       PermitTTY no
+#       ForceCommand cvs server