Fail2ban errors on Freeswitch logs without date

Question

I am trying to configure fail2ban for Freeswithc. Freeswithc logs also some entries without timestamp, like this:

639eacf2-908f-11ec-96f0-f19b85175ba0 2022-02-18 09:50:06.799659 [DEBUG] sofia.c:7084 Channel sofia/LanSideProfile/27124760025@192.16
8.253.99 entering state [received][100]
639eacf2-908f-11ec-96f0-f19b85175ba0 2022-02-18 09:50:06.799659 [DEBUG] sofia.c:7094 Remote SDP:
639eacf2-908f-11ec-96f0-f19b85175ba0 v=0
639eacf2-908f-11ec-96f0-f19b85175ba0 o=FreeSWITCH 1645143180 1645143181 IN IP4 192.168.253.99
639eacf2-908f-11ec-96f0-f19b85175ba0 s=FreeSWITCH
639eacf2-908f-11ec-96f0-f19b85175ba0 c=IN IP4 192.168.253.99
639eacf2-908f-11ec-96f0-f19b85175ba0 t=0 0
639eacf2-908f-11ec-96f0-f19b85175ba0 m=audio 27426 RTP/AVP 0 18 8 101
639eacf2-908f-11ec-96f0-f19b85175ba0 a=rtpmap:0 PCMU/8000
639eacf2-908f-11ec-96f0-f19b85175ba0 a=rtpmap:18 G729/8000
639eacf2-908f-11ec-96f0-f19b85175ba0 a=fmtp:18 annexb=no
639eacf2-908f-11ec-96f0-f19b85175ba0 a=rtpmap:8 PCMA/8000
639eacf2-908f-11ec-96f0-f19b85175ba0 a=rtpmap:101 telephone-event/8000
639eacf2-908f-11ec-96f0-f19b85175ba0 a=fmtp:101 0-15
639eacf2-908f-11ec-96f0-f19b85175ba0 a=silenceSupp:off - - - -
639eacf2-908f-11ec-96f0-f19b85175ba0 a=ptime:20
639eacf2-908f-11ec-96f0-f19b85175ba0 
639eacf2-908f-11ec-96f0-f19b85175ba0 2022-02-18 09:50:06.799659 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [PCMU:0:8000:20:64000:1]/[PCMU:0:8000:20:64000:1]

Fail2Ban encounters errors on these:

2022-02-18 11:19:51,678 fail2ban.filter         [16177]: ERROR   Failed to process line: u'639eacf2-908f-11ec-96f0-f19b85175ba0 v=0', caught exception: IndexError('string index out of range',)
2022-02-18 11:19:51,679 fail2ban.filter         [16177]: ERROR   Failed to process line: u'639eacf2-908f-11ec-96f0-f19b85175ba0 v=0', caught exception: IndexError('string index out of range',)
2022-02-18 11:19:53,681 fail2ban.filter         [16177]: ERROR   Failed to process line: u'639eacf2-908f-11ec-96f0-f19b85175ba0 s=FreeSWITCH', caught exception: IndexError('string index out of range',)
2022-02-18 11:19:53,682 fail2ban.filter         [16177]: ERROR   Failed to process line: u'639eacf2-908f-11ec-96f0-f19b85175ba0 s=FreeSWITCH', caught exception: IndexError('string index out of range',)
2022-02-18 11:19:55,685 fail2ban.filter         [16177]: ERROR   Failed to process line: u'639eacf2-908f-11ec-96f0-f19b85175ba0 c=IN IP4 192.168.253.98', caught exception: IndexError('string index out of range',)
2022-02-18 11:19:55,685 fail2ban.filter         [16177]: ERROR   Failed to process line: u'639eacf2-908f-11ec-96f0-f19b85175ba0 c=IN IP4 192.168.253.98', caught exception: IndexError('string index out of range',)
2022-02-18 11:19:57,688 fail2ban.filter         [16177]: ERROR   Failed to process line: u'639eacf2-908f-11ec-96f0-f19b85175ba0 t=0 0', caught exception: IndexError('string index out of range',)
2022-02-18 11:19:57,688 fail2ban.filter         [16177]: ERROR   Failed to process line: u'639eacf2-908f-11ec-96f0-f19b85175ba0 t=0 0', caught exception: IndexError('string index out of range',)
2022-02-18 11:19:59,692 fail2ban.filter         [16177]: ERROR   Failed to process line: u'639eacf2-908f-11ec-96f0-f19b85175ba0 a=rtpmap:0 PCMU/8000', caught exception: IndexError('string index out of range',)
2022-02-18 11:19:59,693 fail2ban.filter         [16177]: ERROR   Failed to process line: u'639eacf2-908f-11ec-96f0-f19b85175ba0 a=rtpmap:0 PCMU/8000', caught exception: IndexError('string index out of range',)
2022-02-18 11:20:01,698 fail2ban.filter         [16177]: ERROR   Failed to process line: u'639eacf2-908f-11ec-96f0-f19b85175ba0 a=fmtp:101 0-16', caught exception: IndexError('string index out of range',)
2022-02-18 11:20:01,697 fail2ban.filter         [16177]: ERROR   Failed to process line: u'639eacf2-908f-11ec-96f0-f19b85175ba0 a=fmtp:101 0-16', caught exception: IndexError('string index out of range',)
2022-02-18 11:20:03,701 fail2ban.filter         [16177]: ERROR   Failed to process line: u'639eacf2-908f-11ec-96f0-f19b85175ba0 a=ptime:20', caught exception: IndexError('string index out of range',)
2022-02-18 11:20:03,702 fail2ban.filter         [16177]: ERROR   Failed to process line: u'639eacf2-908f-11ec-96f0-f19b85175ba0 a=ptime:20', caught exception: IndexError('string index out of range',)

This is most likely because the logs don't have a date. How can I get rid of these errors?

Answer 1

1. Stackoverflow is a inappropriate place for that issue, next time please use https://serverfault.com/, https://superuser.com/ etc instead.
2. see https://github.com/fail2ban/fail2ban/issues/3020
   Shortly it is fixed in newer versions, but you can workaround it using precise datepattern (like '^S+ {DATE}), if the message you're searching for contain the timestamp, otherwise...
3. see https://github.com/fail2ban/fail2ban/pull/2814 (released with 0.11.2/0.10.6), for instance set datepattern = {NONE} would allow to find failures totally without date-time in log messages.
4. 1645143180 is also timestamp (posix unix time since epoch), fail2ban has also a special datepattern for such format (EPOCH or as part of RE {EPOCH}), but you may need also use more precise pattern.

   Anyway I don't see any failure in log, thus don't really know which lines may be interesting here.