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SSH 身份验证失败警报规则

Microsoft.Linux.RHEL.5.LogFile.Syslog.SSHAuth.PAM.Root.Failure.Alert (Rule)

检测 SSH 身份验证失败的警报规则。

Knowledge Base article:

摘要

在系统日志文件中检测到根帐户的 SSH 身份验证失败。

原因

错误输入的密码或使用无效的用户名可能会导致失败。但是，持续的故障可能表示某人尝试获取未授权的访问。

解决方法

警报和/或输出数据项的描述包含有关遇到的问题的信息。如果发生故障，请检查关联的事件详细信息以及此故障时间附近发生的任何其他事件以诊断问题。

Element properties:

TargetMicrosoft.Linux.RHEL.5.Computer
CategoryEventCollection
EnabledTrue
Alert GenerateTrue
Alert SeverityError
Alert PriorityNormal
RemotableTrue
Alert Message
检测到 SSH 身份验证失败
{0}

Member Modules:

ID Module Type TypeId RunAs 
EventDS DataSource Microsoft.Unix.SCXLog.Privileged.Datasource Default
GenerateAlert WriteAction System.Health.GenerateAlert Default

Source Code:

<Rule ID="Microsoft.Linux.RHEL.5.LogFile.Syslog.SSHAuth.PAM.Root.Failure.Alert" Target="Microsoft.Linux.RHEL.5.Computer" Enabled="true" Remotable="true">

  <Category>EventCollection</Category>

  <DataSources>

    <!-- [TYPE] Redhat5 SSH False -->

    <!-- [INPUT] Jul 31 20:06:25 scxcore-rhel50-01 sshd[16764]: Failed password for root from 172.30.181.43 port 2899 ssh2 -->

    <!-- [INPUT] Jul 31 20:06:25 scxcore-rhel50-01 sshd[16764]: Failed password for invalid user root from 172.30.181.43 port 2899 ssh2 -->

    <!-- [INPUT-MISS] Jul 31 20:06:40 scxcore-rhel50-01 sshd[16766]: Failed password for invalid user kalle from 172.30.181.43 port 2900 ssh2 -->

    <!-- [INPUT-MISS] Jul 31 20:06:04 scxcore-rhel50-01 sshd[16762]: Failed password for jonas from 172.30.181.43 port 2898 ssh2 -->

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

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

      <LogFile>/var/log/secure</LogFile>

      <RegExpFilter>\s+sshd\[[[:digit:]]+\]: Failed password for (invalid user )?root from \S+</RegExpFilter>

      <IndividualAlerts>false</IndividualAlerts>

    </DataSource>

  </DataSources>

  <WriteActions>

    <WriteAction ID="GenerateAlert" TypeID="SystemHealth!System.Health.GenerateAlert">

      <Priority>1</Priority>

      <Severity>2</Severity>

      <AlertMessageId>$MPElement[Name="Microsoft.Linux.RHEL.5.LogFile.Syslog.SSHAuth.PAM.Root.Failure.AlertMessage"]$</AlertMessageId>

      <AlertParameters>

        <AlertParameter1>$Data/EventDescription$</AlertParameter1>

      </AlertParameters>

      <Suppression>

        <SuppressionValue/>

      </Suppression>

    </WriteAction>

  </WriteActions>

</Rule>