[Frage] fail2ban

Lapidu · 28 Feb 2017

Hallo Zusammen,

ich betreibe auf meinen Asterisk fail2ban.

Ich habe vermehrt verschiedene Login Versuche von Hackern.

Bei folgendem Angriff wird die IP Adresse geblockt und ich bekomme eine E-Mail.

Code:

[2017-02-28 13:59:38] NOTICE[1417]: chan_sip.c:28485 handle_request_register: Registration from '<sip:[email protected]>' failed for '80.137.87.271:5060' - Wrong password

Bei folgenden Zeilen passiert leider gar nichts

Code:

[2017-02-28 14:04:45] NOTICE[1417][C-00000016]: chan_sip.c:26165 handle_request_invite: Failed to authenticate from 89.163.146.59:5073 device 120<sip:[email protected]>;tag=c8ac6676
[2017-02-28 14:10:43] NOTICE[1417][C-0000001e]: chan_sip.c:26165 handle_request_invite: Failed to authenticate from 89.163.146.59:5105 device 104<sip:[email protected]>;tag=f129f0e6

[2017-02-28 14:07:45] NOTICE[1417][C-0000001a]: chan_sip.c:26165 handle_request_invite: Failed to authenticate from 89.163.146.59:5089 device 305<sip:[email protected]>;tag=b70a8b36

Meine asterisk.conf sieht so aus

Code:

# Fail2Ban configuration.#
 
 
[INCLUDES]
 
# Read common prefixes. If any customizations available -- read them from
# common.local
#before = common.conf
 
[Definition]
 
#_daemon = asterisk
 
# 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>\S+)
# Values:  TEXT
#
 
failregex = NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - Wrong password
            NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - No matching peer found
            NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - No matching peer found
            NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - Username/auth name mismatch
            NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - Device does not match ACL
            NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - Peer is not supposed to register
            NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - ACL error (permit/deny)
            NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - Device does not match ACL
            NOTICE.* .*: Registration from '".*".*' failed for '<HOST>:.*' - No matching peer found
            NOTICE.* .*: Registration from '".*".*' failed for '<HOST>:.*' - Wrong password
            NOTICE.* <HOST> failed to authenticate as '.*'$
            NOTICE.* .*: No registration for peer '.*' \(from <HOST>\)
            NOTICE.* .*: Host <HOST> failed MD5 authentication for '.*' (.*)
            NOTICE.* .*: Failed to authenticate user .*@<HOST>.*
            NOTICE.* .*: <HOST> failed to authenticate as '.*'
            NOTICE.* .*: <HOST> tried  to authenticate with nonexistent user '.*'
            VERBOSE.*SIP/<HOST>-.*Received incoming SIP connection from unknown peer
 
# Option:  ignoreregex
# Notes.:  regex to ignore. If this regex matches, the line is ignored.
# Values:  TEXT
#
ignoreregex =

Hat jemand eine Idee

thtomate12 · 28 Feb 2017

Ich habe keine Ahnung von Asterisk fail2ban, aber ich sehe, dass es keinen RegEx für diese Meldung gibt, daher geht das auch nicht.

Lapidu · 28 Feb 2017

Wie schaut die den genau aus mit den Variablen?

gunnicom · 2 Mrz 2017

Also bei mir gibts dafür folgende Zeile:

Code:

^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s Failed to authenticate (user|device) [^@]+@<HOST>\S*$

Da bei mir noch ein log_prefix definiert ist hier mal meine komplette:

Code:

[INCLUDES]

# Read common prefixes. If any customizations available -- read them from
# common.local
before = common.conf

[Definition]

_daemon = asterisk

__pid_re = (?:\[\d+\])

iso8601 = \d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d+[+-]\d{4}

# All Asterisk log messages begin like this:
log_prefix= (?:NOTICE|SECURITY)%(__pid_re)s:?(?:\[C-[\da-f]*\])? \S+:\d*( in \w+:)?

failregex = ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s Registration from '[^']*' failed for '<HOST>(:\d+)?' - (Wrong password|Username/auth name mismatch|No matching peer found|Not a local domain|Device does not match ACL|Peer is not supposed to register|ACL error \(permit/deny\)|Not a local domain)$
            ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s Call from '[^']*' \(<HOST>:\d+\) to extension '\d+' rejected because extension not found in context 'default'\.$
            ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s Call from '[^']*' \(<HOST>:\d+\) to extension '\d+' rejected because extension not found in context 'public'\.$
            ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s Host <HOST> failed to authenticate as '[^']*'$
            ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s No registration for peer '[^']*' \(from <HOST>\)$
            ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s Host <HOST> failed MD5 authentication for '[^']*' \([^)]+\)$
            ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s Failed to authenticate (user|device) [^@]+@<HOST>\S*$
            ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s hacking attempt detected '<HOST>'$
            ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s SecurityEvent="(FailedACL|InvalidAccountID|ChallengeResponseFailed|InvalidPassword)",EventTV="([\d-]+|%(iso8601)s)",Severity="[\w]+",Service="[\w]+",EventVersion="\d+",AccountID="(\d*|<unknown>)",SessionID=".+",LocalAddress="IPV[46]/(UDP|TCP|WS)/[\da-fA-F:.]+/\d+",RemoteAddress="IPV[46]/(UDP|TCP|WS)/<HOST>/\d+"(,Challenge="[\w/]+")?(,ReceivedChallenge="\w+")?(,Response="\w+",ExpectedResponse="\w*")?(,ReceivedHash="[\da-f]+")?(,ACLName="\w+")?$
            ^(%(__prefix_line)s|\[\]\s*WARNING%(__pid_re)s:?(?:\[C-[\da-f]*\])? )Ext\. s: "Rejecting unknown SIP connection from <HOST>"$

ignoreregex =

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