fail2ban: add sshd rules

fail2ban/filter.d/sshd-ddos.conf

+# Fail2Ban configuration file
+#
+# Author: Yaroslav Halchenko
+#
+# $Revision$
+#
+
+[Definition]
+
+# Option:  failregex
+# Notes.:  regex to match the password failures messages in the logfile. The
+#          host must be matched by a group named "host". The tag "<HOST>" can
+#          be used for standard IP/hostname matching and is only an alias for
+#          (?:::f{4,6}:)?(?P<host>[\w\-.^_]+)
+# Values:  TEXT
+#
+failregex = sshd(?:\[\d+\])?: Did not receive identification string from <HOST>$
+
+# Option:  ignoreregex
+# Notes.:  regex to ignore. If this regex matches, the line is ignored.
+# Values:  TEXT
+#
+ignoreregex = 

fail2ban/filter.d/sshd.conf

+# Fail2Ban configuration file
+#
+# Author: Cyril Jaquier
+#
+# $Revision$
+#
+
+[INCLUDES]
+
+# Read common prefixes. If any customizations available -- read them from
+# common.local
+before = common.conf
+
+
+[Definition]
+
+_daemon = sshd
+
+# Option:  failregex
+# Notes.:  regex to match the password failures messages in the logfile. The
+#          host must be matched by a group named "host". The tag "<HOST>" can
+#          be used for standard IP/hostname matching and is only an alias for
+#          (?:::f{4,6}:)?(?P<host>[\w\-.^_]+)
+# Values:  TEXT
+#
+failregex = ^%(__prefix_line)s(?:error: PAM: )?Authentication failure for .* from <HOST>\s*$
+            ^%(__prefix_line)s(?:error: PAM: )?User not known to the underlying authentication module for .* from <HOST>\s*$
+            ^%(__prefix_line)sFailed (?:password|publickey) for .* from <HOST>(?: port \d*)?(?: ssh\d*)?\s*$
+            ^%(__prefix_line)sROOT LOGIN REFUSED.* FROM <HOST>\s*$
+            ^%(__prefix_line)s[iI](?:llegal|nvalid) user .* from <HOST>\s*$
+            ^%(__prefix_line)sUser .+ from <HOST> not allowed because not listed in AllowUsers\s*$
+            ^%(__prefix_line)sUser .+ from <HOST> not allowed because listed in DenyUsers\s*$
+            ^%(__prefix_line)s(?:pam_unix\(sshd:auth\):\s)?authentication failure; logname=\S* uid=\S* euid=\S* tty=\S* ruser=\S* rhost=<HOST>(?:\s+user=.*)?\s*$
+            ^%(__prefix_line)srefused connect from \S+ \(<HOST>\)\s*$
+            ^%(__prefix_line)sAddress <HOST> .* POSSIBLE BREAK-IN ATTEMPT!*\s*$
+            ^%(__prefix_line)sUser .+ from <HOST> not allowed because none of user's groups are listed in AllowGroups\s*$
+
+# Option:  ignoreregex
+# Notes.:  regex to ignore. If this regex matches, the line is ignored.
+# Values:  TEXT
+#
+ignoreregex =