Subversion Repositories configs

# Fail2Ban filter for openssh

#

# If you want to protect OpenSSH from being bruteforced by password

# authentication then get public key authentication working before disabling

# PasswordAuthentication in sshd_config.

#

#

# "Connection from <HOST> port \d+" requires LogLevel VERBOSE in sshd_config

#

[INCLUDES]

# Read common prefixes. If any customizations available -- read them from

# common.local

before = common.conf

[Definition]

_daemon = sshd

failregex = ^%(__prefix_line)s(?:error: PAM: )?[aA]uthentication (?:failure|error) for .* from <HOST>( via \S+)?\s*$

            ^%(__prefix_line)s(?:error: PAM: )?User not known to the underlying authentication module for .* from <HOST>\s*$

            ^%(__prefix_line)sFailed \S+ for .*? from <HOST>(?: port \d*)?(?: ssh\d*)?(: (ruser .*|(\S+ ID \S+ \(serial \d+\) CA )?\S+ %(__md5hex)s(, client user ".*", client host ".*")?))?\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)sUser .+ from <HOST> not allowed because not in any group\s*$

            ^%(__prefix_line)srefused connect from \S+ \(<HOST>\)\s*$

            ^%(__prefix_line)sReceived disconnect from <HOST>: 3: \S+: Auth fail$

            ^%(__prefix_line)sUser .+ from <HOST> not allowed because a group is listed in DenyGroups\s*$

            ^%(__prefix_line)sUser .+ from <HOST> not allowed because none of user's groups are listed in AllowGroups\s*$

            ^(?P<__prefix>%(__prefix_line)s)User .+ not allowed because account is locked<SKIPLINES>(?P=__prefix)(?:error: )?Received disconnect from <HOST>: 11: .+ \[preauth\]$

            ^(?P<__prefix>%(__prefix_line)s)Disconnecting: Too many authentication failures for .+? \[preauth\]<SKIPLINES>(?P=__prefix)(?:error: )?Connection closed by <HOST> \[preauth\]$

            ^(?P<__prefix>%(__prefix_line)s)Connection from <HOST> port \d+(?: on \S+ port \d+)?<SKIPLINES>(?P=__prefix)Disconnecting: Too many authentication failures for .+? \[preauth\]$

            ^%(__prefix_line)spam_unix\(sshd:auth\):\s+authentication failure;\s*logname=\S*\s*uid=\d*\s*euid=\d*\s*tty=\S*\s*ruser=\S*\s*rhost=<HOST>\s.*$

ignoreregex =

[Init]

# "maxlines" is number of log lines to buffer for multi-line regex searches

maxlines = 10

journalmatch = _SYSTEMD_UNIT=sshd.service + _COMM=sshd

# DEV Notes:

#

#   "Failed \S+ for .*? from <HOST>..." failregex uses non-greedy catch-all because

#   it is coming before use of <HOST> which is not hard-anchored at the end as well,

#   and later catch-all's could contain user-provided input, which need to be greedily

#   matched away first.

#

# Author: Cyril Jaquier, Yaroslav Halchenko, Petr Voralek, Daniel Black