View file File name : exim.conf Content :# Fail2Ban filter for exim # # This includes the rejection messages of exim. For spam and filter # related bans use the exim-spam.conf # [INCLUDES] # Read common prefixes. If any customizations available -- read them from # exim-common.local before = exim-common.conf [Definition] # Fre-filter via "prefregex" is currently inactive because of too different failure syntax in exim-log (testing needed): #prefregex = ^%(pid)s <F-CONTENT>\b(?:\w+ authenticator failed|([\w\-]+ )?SMTP (?:(?:call|connection) from|protocol(?: synchronization)? error)|no MAIL in|(?:%(host_info_pre)s\[[^\]]+\]%(host_info_suf)s(?:sender verify fail|rejected RCPT|dropped|AUTH command))).+</F-CONTENT>$ failregex = ^%(pid)s %(host_info)ssender verify fail for <\S+>: (?:Unknown user|Unrouteable address|all relevant MX records point to non-existent hosts)\s*$ ^%(pid)s \w+ authenticator failed for (?:[^\[\( ]* )?(?:\(\S*\) )?\[<HOST>\](?::\d+)?(?: I=\[\S+\](:\d+)?)?: 535 Incorrect authentication data( \(set_id=.*\)|: \d+ Time\(s\))?\s*$ ^%(pid)s %(host_info)srejected RCPT [^@]+@\S+: (?:relay not permitted|Sender verify failed|Unknown user|Unrouteable address)\s*$ ^%(pid)s SMTP protocol synchronization error \([^)]*\): rejected (?:connection from|"\S+") %(host_info)s(?:next )?input=".*"\s*$ ^%(pid)s SMTP call from (?:[^\[\( ]* )?%(host_info)sdropped: too many (?:nonmail commands|syntax or protocol errors) \(last (?:command )?was "[^"]*"\)\s*$ ^%(pid)s SMTP protocol error in "[^"]+(?:"+[^"]*(?="))*?" %(host_info)sAUTH command used when not advertised\s*$ ^%(pid)s no MAIL in SMTP connection from (?:[^\[\( ]* )?(?:\(\S*\) )?%(host_info)sD=\d\S*s(?: C=\S*)?\s*$ ^%(pid)s (?:[\w\-]+ )?SMTP connection from (?:[^\[\( ]* )?(?:\(\S*\) )?%(host_info)sclosed by DROP in ACL\s*$ <mdre-<mode>> mdre-aggressive = ^%(pid)s no host name found for IP address <HOST>$ ^%(pid)s no IP address found for host \S+ \(during SMTP connection from \[<HOST>\]\)$ mdre-normal = # Parameter `mode` - `normal` or `aggressive`. # Aggressive mode can be used to match flood and ddos-similar log-entries like: # 'no host found for IP', 'no IP found for host'. # Note this is not an authentication failures, so it may produce lots of false # positives on misconfigured MTAs. # Ex.: # filter = exim[mode=aggressive] mode = normal ignoreregex = # DEV Notes: # The %(host_info) defination contains a <HOST> match # # SMTP protocol synchronization error \([^)]*\) <- This needs to be non-greedy # to void capture beyond ")" to avoid a DoS Injection vulnerabilty as input= is # user injectable data. # # Author: Cyril Jaquier # Daniel Black (rewrote with strong regexs) # Martin O'Neal (added additional regexs to detect authentication failures, protocol errors, and drops)