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Failed ssh login (SUSE Linux Enterprise Server 12)

Microsoft.ACS.Linux.SLES.12.Ssh.Failed (Rule)

Rule to collect events for failed ssh login

Knowledge Base article:

Summary

An unsuccessful ssh command has been detected in the system log files.

Causes

User was not granted access to the system remotely. This monitor allows system administrators to track 'ssh' usage.

Resolutions

The description of the alert and/or the output data item contains information on the event encountered. If the activity appears suspicious, please check the associated event details and any other events that happened around the time of this event.

Element properties:

TargetMicrosoft.ACS.Linux.SLES.12.ACSEndPoint
CategoryEventCollection
EnabledTrue
Alert GenerateFalse
RemotableTrue

Member Modules:

ID Module Type TypeId RunAs 
EventDS DataSource Microsoft.Unix.SCXLog.Privileged.Datasource Default
WA WriteAction Microsoft.ACS.Unix.SecureEventLogWriter Default

Source Code:

<Rule ID="Microsoft.ACS.Linux.SLES.12.Ssh.Failed" Enabled="true" Target="Microsoft.ACS.Linux.SLES.12.ACSEndPoint" Remotable="true">

  <Category>EventCollection</Category>

  <DataSources>

    <DataSource ID="EventDS" TypeID="Unix!Microsoft.Unix.SCXLog.Privileged.Datasource">

      <Host>$Target/Host/Property[Type="Unix!Microsoft.Unix.Computer"]/NetworkName$</Host>

      <LogFile>/var/log/messages</LogFile>

      <!-- [TYPE] SUSE SSH False -->

      <!-- [INPUT] Oct  7 17:17:09 sles11-cjc sshd[28526]: error: PAM: Authentication failure for root from 192.168.233.132 -->

      <!-- [INPUT] Oct  8 09:50:11 sles11-cjc sshd[22952]: error: PAM: Authentication failure for illegal user newguy from localhost -->

      <!-- [EXPECTED] date="Oct  7 17:17:09"; hostname="sles11-cjc"; process="sshd"; processId="28526"; user="root"; clientHost="192.168.233.132" -->

      <!-- [EXPECTED] date="Oct  8 09:50:11"; hostname="sles11-cjc"; process="sshd"; processId="22952"; user="newguy"; clientHost="localhost" -->

      <RegExpFilter>sshd\s*\[[[:digit:]]+\]\s*:\s*error:\s*PAM:\s*Authentication\s+failure.*\s+\S+\s+from\s+\S+</RegExpFilter>

    </DataSource>

  </DataSources>

  <WriteActions>

    <WriteAction ID="WA" TypeID="ACS.Unix!Microsoft.ACS.Unix.SecureEventLogWriter">

      <RegExp>(?'date'\S+\s+\d+\s+\d+:\d+:\d+)\s+(?:\S+:)?(?'hostname'\S+)\s+(?'process'sshd)\s*\[(?'processId'\d+)\]\s*:\s*error:\s*PAM:\s*Authentication\s+failure.*\s+(?'user'\S+)\s+from\s+(?'clientHost'\S+)</RegExp>

      <EventType>0</EventType>

      <EventId>27003</EventId>

    </WriteAction>

  </WriteActions>

</Rule>