69 lines
3.2 KiB
Plaintext
69 lines
3.2 KiB
Plaintext
# Remote audit / syslog collector for the diskless fleet (LAB).
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#
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# Receives logs forwarded by booted diskless hosts over plain TCP/514 and writes
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# them per-source-host. Diskless hosts have an immutable, RAM-only overlay root,
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# so their local audit log dies on reboot — this gives auditd somewhere durable
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# to offload to (STIG remote-audit-offload, deviation #6 in docs/stig-deviations.md).
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#
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# Lab posture: PLAINTEXT TCP, mirroring the HTTP-boot/no-TLS lab stack. For
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# production switch to TLS (gtls driver) or RELP+TLS and restrict senders by
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# subnet — see README.md.
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global(workDirectory="/var/spool/rsyslog")
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# --- intake: plain TCP syslog ---
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module(load="imtcp" maxSessions="1000")
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input(type="imtcp" port="514")
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# Some senders only speak UDP; uncomment to also accept it (lossy, no queue).
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#module(load="imudp")
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#input(type="imudp" port="514")
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# Disk-assisted main queue so a brief disk stall or a burst of records doesn't
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# drop audit events (the records keep flowing to spool, then drain to disk).
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main_queue(
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queue.type="LinkedList"
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queue.filename="mainq"
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queue.maxdiskspace="1g"
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queue.saveOnShutdown="on"
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)
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# --- relay a COPY of audit records to the Wazuh SIEM (separate node) -----------
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# Forwards audit/local6 records to the Wazuh manager's syslog listener on the
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# dedicated SIEM node (wazuh1.bitasylum.org) for parsing/correlation/alerting,
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# WHILE still writing the durable per-host files below (no `stop`, so records
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# continue to the file actions). Own disk-assisted queue -> a Wazuh outage never
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# blocks the file writes or drops records (resumeRetryCount=-1 spools + drains on
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# reconnect). The serving host must resolve + route to the SIEM node. After
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# editing, rebuild: `docker compose build audit && docker compose up -d audit`.
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#
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# ⚠ PLAINTEXT 514 — only acceptable if serving-host → SIEM-node is a TRUSTED
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# private path. Audit records are sensitive; if this hop crosses any routed/
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# untrusted network, switch to syslog-over-TLS (gtls, port 6514, fleet CA) BEFORE
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# relying on it (ISM: protect logs in transit). See serving/siem/README.md.
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if ($programname == 'audispd')
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or ($programname startswith 'audit')
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or ($syslogfacility-text == 'local6') then {
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action(type="omfwd" target="wazuh1.bitasylum.org" port="514" protocol="tcp"
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action.resumeRetryCount="-1"
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queue.type="LinkedList" queue.filename="wazuhfwdq"
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queue.maxDiskSpace="256m" queue.saveOnShutdown="on")
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}
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# --- per-source-host files (keyed by SENDER IP, not the claimed hostname) ---
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template(name="HostAudit" type="string" string="/var/log/remote/%FROMHOST-IP%/audit.log")
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template(name="HostMessages" type="string" string="/var/log/remote/%FROMHOST-IP%/messages.log")
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# Audit records (audisp-syslog tags them 'audispd'/'audit', or forwards on the
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# local6 facility) go to a dedicated per-host audit.log; everything else to
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# messages.log. Files/dirs are created 0640/0750 (audit logs aren't world-read).
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if ($programname == 'audispd')
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or ($programname startswith 'audit')
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or ($syslogfacility-text == 'local6') then {
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action(type="omfile" dynaFile="HostAudit"
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dirCreateMode="0750" fileCreateMode="0640")
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stop
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}
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action(type="omfile" dynaFile="HostMessages"
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dirCreateMode="0750" fileCreateMode="0640")
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