拆分 syslog-ng 消息

拆分 syslog-ng 消息

我想将sshd日志条目中的源 IP 地址从内部保存到 mysql 数据库中syslog-ng。目前,我已定义一个过滤器,该过滤器与所需日志条目的子字符串匹配。

我可以将整个日志条目保存到数据库中,但是$MSG系统日志条目的一部分包含大量我不想要的额外数据。有没有办法“拆分”系统日志条目的字段,以便仅将 IP 地址写入数据库?

这是我的配置:

filter f_sshd
{
   # (log entry) Sep  5 14:59:20 myhost4 sshd Starting session: shell on pts/0 for rbackup from 10.120.192.25 port 36894 id 0
   match("Starting session:" value ("MESSAGE") );
};


destination d_sshd
{
   sql( type(mysql)
   username("xxxxx")
   password("xxxxxxx")
   database("syslog")
   host("localhost")
   table("ssh")
   columns("host", "facility", "priority", "level", "pid", "tag", "timestamp", "program", "msg")
   values("$HOST", "$FACILITY", "$PRIORITY", "$LEVEL", "$PID", "$TAG","$YEAR-$MONTH-$DAY $HOUR:$MIN:$SEC","$PROGRAM", "$MSG")
   indexes("timestamp", "host", "program", "pid", "message"));
};

log
{
   # s_stunnel is defined in syslog-ng/conf.d/stunnel.conf
   source(s_stunnel);
   filter(f_sshd);
   destination(d_sshd);
};

答案1

您可以使用创建解析器syslog-ng-patterndb提取消息的部分内容。

创建 XML 文件来定义你的解析器(/etc/syslog-ng/template_sshd.xml):

<patterndb version='4' pub_date='2010-10-17'>
    <ruleset name='ssh' id='123456678'>
        <pattern>ssh</pattern>
            <rules>
                <rule provider='me' id='182437592347598' class='system'>
                    <patterns>
                        <pattern>Starting session: shell on @ESTRING:SSH_TERMINAL: @for @ESTRING:SSH_USERNAME: @from @ESTRING:SSH_CLIENT_ADDRESS: @port @NUMBER:SSH_PORT_NUMBER:@ id @NUMBER:SSH_ID@</pattern>
                    </patterns>
                    <examples>
                        <example>
                            <test_message program="ssh">Starting session: shell on pts/0 for rbackup from 10.120.192.25 port 36894 id 0</test_message>
                            <test_values>
                                <test_value name="SSH_TERMINAL">pts/0</test_value>
                                <test_value name="SSH_USERNAME">sampleuser</test_value>
                                <test_value name="SSH_CLIENT_ADDRESS">192.168.10.12</test_value>
                                <test_value name="SSH_PORT_NUMBER">42156</test_value>
                                <test_value name="SSH_ID">1</test_value>
                            </test_values>
                       </example>
                    </examples>
                </rule>
            </rules>
    </ruleset>
</patterndb>

然后在你的syslog-ng.conf

定义解析器:

parser sshd_pattern { db_parser(file("/etc/syslog-ng/template_sshd.xml")); };

在您的日志指令中调用解析器:

log
{
   # s_stunnel is defined in syslog-ng/conf.d/stunnel.conf
   source(s_stunnel);
   parser(sshd_pattern);  <---- call parser
   filter(f_sshd);
   destination(d_sshd);
};

SSH_CLIENT_ADDRESS在目标中使用解析器的变量:

destination d_sshd
{
  file("/var/log/sshd.log"
  template("${SSH_USERNAME}; ${SSH_CLIENT_ADDRESS}; ${HOST}; ${FACILITY}; ${PRIORITY}; ${LEVEL}; ${PID}; ${TAG}; ${YEAR}-${MONTH}-${DAY} ${HOUR}:${MIN}:${SEC}; ${PROGRAM}; \n")
  template_escape(no)
 );
};

单元测试运行:

pdbtool match -P "ssh" -M "Starting session: shell on pts/0 for rbackup from 10.120.192.25 port 36894 id 0" -p template_sshd.xml -c -D -v

应该返回:

SSH_TERMINAL=pts/0
SSH_USERNAME=rbackup
SSH_CLIENT_ADDRESS=10.120.192.25
SSH_PORT_NUMBER=36894
SSH_ID=0

改编自此链接:https://gist.github.com/linickx/8002981


根据您的评论进行以下编辑:

理想情况下,SSH_TERMINAL 密钥可以吞掉从 session: 后的空格到 bareword 的所有内容

像这样更改 XML 中的模式:

<pattern>Starting session: @ESTRING:SSH_TERMINAL:from @@ESTRING:SSH_CLIENT_ADDRESS: @port @NUMBER:SSH_PORT_NUMBER:@ id @NUMBER:SSH_ID@</pattern>

返回:

# pdbtool match -P "ssh" -M "Starting session: shell on pts/0 for rbackup from 10.120.192.25 port 36894 id 0" -p template_sshd.xml -c -D -v

SSH_TERMINAL=shell on pts/0 for rbackup  <-- you got all between "session:" to "from"
SSH_CLIENT_ADDRESS=10.120.192.25
SSH_PORT_NUMBER=36894
SSH_ID=0

关于模式解析器的进一步阅读:https://www.syslog-ng.com/technical-documents/doc/syslog-ng-open-source-edition/3.16/administration-guide/72

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