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失败的 ssh 登录(SUSE Linux Enterprise Server 9)

Microsoft.ACS.Linux.SLES.9.Ssh.Failed (Rule)

用于收集失败的 ssh 登录事件的规则

Knowledge Base article:

摘要

在系统日志文件中检测到不成功的 ssh 命令。

原因

未授予用户远程访问系统的权限。该监视器允许系统管理员跟踪“ssh”使用率。

解决方法

警报和/或输出数据项的描述包含有关遇到的事件的信息。如果活动显得可疑，请检查关联的事件详细信息以及此事件时间附近发生的任何其他事件。

Element properties:

TargetMicrosoft.ACS.Linux.SLES.9.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.9.Ssh.Failed" Enabled="true" Target="Microsoft.ACS.Linux.SLES.9.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] Nov 30 12:37:25 sles9v4-cjc sshd[11468]: error: PAM: Authentication failure for ccrammo from localhost -->

      <!-- [INPUT] Nov 30 12:37:40 sles9v4-cjc sshd[11474]: error: PAM: Authentication failure for root from localhost -->

      <!-- [INPUT] Nov 30 12:39:42 sles9v4-cjc sshd[11600]: error: PAM: Authentication failure for illegal user newguy from localhost -->

      <!-- [INPUT] Nov 30 12:40:05 sles9v4-cjc sshd[11621]: error: PAM: Authentication failure for illegal user root from localhost -->

      <!-- [EXPECTED] date="Nov 30 12:37:25"; hostname="sles9v4-cjc"; process="sshd"; processId="11468"; user="ccrammo"; clientHost="localhost" -->

      <!-- [EXPECTED] date="Nov 30 12:37:40"; hostname="sles9v4-cjc"; process="sshd"; processId="11474"; user="root"; clientHost="localhost" -->

      <!-- [EXPECTED] date="Nov 30 12:39:42"; hostname="sles9v4-cjc"; process="sshd"; processId="11600"; user="newguy"; clientHost="localhost" -->

      <!-- [EXPECTED] date="Nov 30 12:40:05"; hostname="sles9v4-cjc"; process="sshd"; processId="11621"; user="root"; 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>