Crowdsec configuration for mox mailserver logs

README.md

Custom collection for handling mox mail server logs in crowdsec. The HTTP logs are parsed as a standard http access log so that the standard scenarios work, the mail logs require a custom scenario

cat acquis.yaml >> /etc/crowdsec/acquis.yaml
mkdir -p /etc/crowdsec/parsers/s01-parsers/mox
mv mox-parser.yaml /etc/crowdsec/parsers/s01-parsers/mox/mox-parser.yaml
mkdir -p /etc/crowdsec/scenarios/mox
mv mox-auth-fail-scenario.yaml /etc/crowdsec/scenarios/mox/mox-auth-fail.yaml
cscli collections install crowdsecurity/base-http-scenarios
systemctl reload crowdsec

acquis.yaml

---
filenames:
  - /var/log/mail.log
labels:
  type: mail

LICENSE

This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or
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binary, for any purpose, commercial or non-commercial, and by any
means.

In jurisdictions that recognize copyright laws, the author or authors
of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit
of the public at large and to the detriment of our heirs and
successors. We intend this dedication to be an overt act of
relinquishment in perpetuity of all present and future rights to this
software under copyright law.

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mox-auth-fail.yaml

# Custom ecenario for mox authenitcation failures
name: mox-auth-failure
type: leaky
description: "Detect failed authentication attempts on mox service"
filter: "evt.Parsed.service == 'mox' && evt.Meta.event_type == 'failed_authentication'"
leakspeed: "600s"
capacity: 1
groupby: evt.Meta.source_ip
blackhole: 1m
reprocess: true
labels:
  service: mox
  spoofable: 0
  confidence: 3
  remediation: true

mox-parser.yaml

filter: "evt.Line.Labels.type == 'mail'"
name: mox/mox-parser
nodes:
  - grok:
      pattern: '^%{TIMESTAMP_ISO8601:timestamp}.*(result=badcreds|many auth failures).*'
      apply_on: message
      statics:
        - parsed: kv_parsed
          expression: ParseKV(evt.Line.Raw, evt.Unmarshaled, "message")
        - target: evt.StrTime
          expression: evt.Parsed.timestamp
        - meta: event_type
          value: failed_authentication
        - parsed: service
          value: "mox"
        - meta: user
          expression: evt.Unmarshaled.message.address
        - meta: source_ip
          expression: evt.Unmarshaled.message.remoteip
  - grok:
      pattern: '^%{TIMESTAMP_ISO8601:timestamp}.*"http request".*'
      apply_on: message
      statics:
        - parsed: kv_parsed
          expression: ParseKV(evt.Line.Raw, evt.Unmarshaled, "message")
        - target: evt.StrTime
          expression: evt.Parsed.timestamp
        - meta: http_status
          expression: evt.Unmarshaled.message.statuscode
        - parsed: request
          expression: evt.Unmarshaled.message.url
        - meta: http_path
          expression: evt.Unmarshaled.message.url
        - meta: http_verb
          expression: evt.Unmarshaled.message.method
        - meta: http_user_agent
          expression: evt.Unmarshaled.message.useragent
        - meta: target_fqdn
          expression: evt.Unmarshaled.message.host
        - meta: source_ip
          expression: Split(evt.Unmarshaled.message.remoteaddr, ":")[0]
        - meta: log_type
          value: http_access-log
        - meta: service
          value: http
statics:
  - target: evt.StrTime
    expression: evt.Parsed.timestamp
onsuccess: next_stage