Splunk奇巧淫技那些事

Splunk奇巧淫技那些事

0x00 Splunk 数据转发/过滤/处理那些事

A Splunk 将数据转发到第三方系统

将数据转发到第三方系统 - Splunk 文档

工作节点：HF OR Indexer NO Indexer Cluster

流程：props -> transforms -> outputs

props.conf transforms.conf outputs.conf
确定哪些数据进行数据转发 配置数据转发策略 配置目标ip端口消息

  1. outputs.conf

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    # 默认数据转发组
    [syslog]
    defaultGroup = syslogoutputsGroup

    # 配置syslog数据转发目标地址
    [syslog:syslogoutputsGroup]
    type = udp
    # 协议
    server = 10.203.19.22:514
    # 目标ip和端口

  2. props.conf

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    # 需要转发的sourcetype名称
    [sourcetype::cosmo_syslog]
    TRANSFORMS-syslog = splunk_syslog_outpust

    # 需要转发的sourcetype名称
    [sourcetype::cosmo_cisco:asa]
    TRANSFORMS-cisco-asa = splunk_syslog_outpust

    # 需要转发的sourcetype名称
    [sourcetype::cosmo_cisco_asa_anquan]
    TRANSFORMS-cisco_asa_anquan] = splunk_syslog_outpust

  3. transforms.conf

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    [splunk_syslog_outpust]
    REGEX = .
    DEST_KEY = _SYSLOG_ROUTING
    FORMAT = syslogoutputsGroup

B Splunk 基于source过滤数据

工作节点：HF OR Indexer NO Indexer Cluster

设置transforms.conf创建过滤数据规则

问题：将普罗米修斯数据接入到splunk系统中发现数据量非常庞大(有1560个指标项),真正使用到的指标项不到100个，需要过滤掉不需要的指标

  1. props.conf

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    [prometheus_filter]
    # prometheus_filter sourcetype 解析规则
    TIME_FORMAT = %s%3N
    TIME_PREFIX = }\s[\d\-\.]+\s
    NO_BINARY_CHECK = true
    SHOULD_LINEMERGE = false
    pulldown_type = 1
    category = Metrics
    EXTRACT-metric_name,num1,num2 = ^(?P<metric_name>[^\{]+)[^\}\n]*\}\s+(?P<num1>[^ ]+)\s+(?P<num2>.+)
    # 指定transforms.conf 配置内容
    TRANSFORMS-set = setnull,conform

  2. transforms.conf

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    [conform]
    REGEX = container_cpu_load_average_10s|container_cpu_usage_seconds_total|container_fs_limit_bytes|container_fs_usage_bytes|container_memory_cache|container_memory_usage_bytes|container_memory_working_set_bytes|container_network_receive_bytes_total|container_network_transmit_bytes_total|container_spec_memory_limit_bytes|jvm_gc_collection_seconds_count|jvm_gc_collection_seconds_sum|jvm_memory_bytes_used|jvm_memory_pool_bytes_max|jvm_memory_pool_bytes_used|jvm_threads_current|jvm_threads_deadlocked|jvm_threads_peak|kube_pod_container_status_ready|kube_pod_container_status_running|kube_pod_container_status_terminated|kube_pod_container_status_waiting|machine_cpu_cores|machine_memory_bytes|mysql_global_status_aborted_clients|mysql_global_status_commands_total|mysql_global_status_innodb_data_fsyncs|mysql_global_status_innodb_data_reads|mysql_global_status_innodb_data_writes|mysql_global_status_select_full_join|mysql_global_status_select_scan|mysql_global_status_slow_queries|mysql_global_status_sort_scan|mysql_global_status_threads_connected|mysql_global_status_threads_created|nginx_connections_accepted|nginx_connections_active|nginx_connections_handled|nginx_http_requests_total|node_network_info|rabbitmq_channelsTotal|rabbitmq_connectionsTotal|rabbitmq_consumersTotal|rabbitmq_exchangesTotal|rabbitmq_fd_total|rabbitmq_fd_used|rabbitmq_queue_messages_ready_total|rabbitmq_queue_messages_total|rabbitmq_queue_messages_unacknowledged_total|rabbitmq_queuesTotal|rabbitmq_sockets_total|rabbitmq_sockets_used|rabbitmq_up|redis_blocked_clients|redis_commands_processed_total|redis_connected_clients|redis_evicted_keys_total|redis_expired_keys_total|redis_keyspace_hits_total|redis_keyspace_misses_total|redis_memory_used_bytes|zk_max_latency|zk_num_alive_connections|zk_open_file_descriptor_count|zk_outstanding_requests|zk_up|zk_watch_count|zk_znode_count
    # 需要采集的数据，通过正则表达式匹配。
    # 内容为_raw内容 math(_raw,REGEX)
    DEST_KEY = queue
    FORMAT = indexQueue 
    # 转发到索引队列

    [setnull]
    REGEX = .
    DEST_KEY = queue
    FORMAT = nullQueue # 传递到nullQueue

C Splunk 基于Host字段过滤数据

实现原理：forwarder采集数据发送到HeavyForwarder上进行解析，由此在HeavyForwarder创建数据过滤规则。

工作节点：HF OR Indexer NO Indexer Cluster

  1. 编辑props.conf

    使用SSH工具登录到Heavy Forwarder服务器

    编辑/opt/splunk/etc/apps/Splunk_TA_windows/local/props.conf

    (如文件不存在则新建)。在文件末尾添加以下内容：

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    [host::example_hostname] # example-hostname 为排除数据的agent主机名
    TRANSFORMS-filterhostname = conform,setnull

    [host::example_ip] # example-IP 为排除数据的agentIP地址
    TRANSFORMS-filterIP = conform,setnull

  2. 编辑transforms.conf

    编辑/opt/splunk/etc/apps/Splunk_TA_windows/local/transforms.conf

    (如文件不存在则新建)。在文件末尾添加以下内容：

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    >[conform]
    >REGEX = .
    >DEST_KEY = queue
    >FORMAT = indexQueue

    >[setnull]
    ># 数据不保存，转发到空消息队列
    >REGEX = ((\<EventID\>4703\<\/EventID\>)|(EventCode=4703))
    >DEST_KEY = queue
    >FORMAT = nullQueue

  3. 访问HF refresh web界面刷新配置文件

    http://HeavyForwarderIP:8000/zh-CN/debug/refresh

    # 需要使用admin账号登入

    界面如下：

    splunk refresh

    完成效果如下：

    splunk refresh logs

D Splunk 数据拆分成不同的sourcetyp

不同种类的网络安全数据全部通过udp 514端口进行数据接收，创建采集配置无法指定多个sourcetype，可以根据source字段进行sourcetype拆分，匹配正则表达式拆分sourcetype

工作节点：HF OR Indexer NO Indexer Cluster

  1. props.conf

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    [source::example_udp:514]
    SHOULD_LINEMERGE = false
    TRANSFORMS-changesourcetype = mcafee_ips:syslog,f5_bigip:syslog,asiainfo:tda

  2. transforms.conf

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    [asiainfo:tda]
    REGEX = CEF:\d\|(Asiainfo Security|AsiaInfo|Trend Micro)\|(Control Manager|Deep Discovery Analyzer|Deep Security Agent|Deep Security Manager|TDA|Deep Discovery Email Inspector)
    FORMAT = sourcetype::asiainfo:tda
    DEST_KEY = MetaData:Sourcetype
      
    [f5_bigip:syslog]
    REGEX = \tASM\:CEF\:\d|F5|ASM
    FORMAT = sourcetype::f5_bigip:syslog
    DEST_KEY = MetaData:Sourcetype
      
    [mcafee_ips:syslog]
    REGEX = SyslogAlertForwarder:\s\|\d*
    FORMAT = sourcetype::mcafee:ips:syslog
    DEST_KEY = MetaData:Sourcetype

E Splunk 数据转发到多台indexer节点(transforms)

配置文件所在节点即工作节点：HF

  1. props.conf

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    [splunktcp]
    TRANSFORMS-routing = route_all

  2. outputs.conf

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    # 注意点：不要加defaultGroup配置，否则数据优先给defaultGroup组发送。
    # [tcpout]
    # defaultGroup = idxc_dv

    # 普通数据转发
    [tcpout:mss_idx]
    disabled = false
    server = 10.10.0.104:9997

    # 索引器发现
    [tcpout:idxc_dv]
    indexerDiscovery = indexer_cluster_discovery

    [indexer_discovery:indexer_cluster_discovery]
    # 密码：idx_dv
    pass4SymmKey = $7$Vys7w3j3T5J1N0u5fr9JYbHGQe5Zh7Hef65c/I4vUOj8THEmBJI=
    master_uri = https://10.10.0.121:8089

    补充点：master节点上面配置索引器发现

    配置文件：$SPLUNK_HOME/etc/system/local/server.conf

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    [indexer_discovery]
    # 密码：idx_dv
    pass4SymmKey = $7$8OOMpbWXJscp69HifzghTxen+OgyLkvOkf51+1ioUDf0cyCjfRw=
    polling_rate = 10
    indexerWeightByDiskCapacity = false

  3. transforms.conf

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    [route_all]
    REGEX=(.)
    DEST_KEY=_TCP_ROUTING
    FORMAT=idxc_dv,mss_idx

F Splunk 数据转发到多台indexer节点(inputs)

用于转发HF节点采集syslog落盘数据

工作节点：HF

  1. outputs.conf

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    [tcpout:mss_idxc]
    server=server1:9997,server2:9997

    [tcpout:local_idxc]
    server=server3:9997,server4:9997

    # 注意点：不要加defaultGroup配置，否则不生效
    # [tcpout]
    # defaultGroup = primary_indexers

  2. inputs.conf

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    [monitor://.../file1.log]
    _TCP_ROUTING = local_idxc

    [monitor://.../file2.log]
    _TCP_ROUTING = mss_idxc

    [monitor://.../file3.log]
    _TCP_ROUTING = local_idxc,mss_idxc
    # 也可以配置多个outputs转发

0x01 SplunkUF修改8089端口(管理端口)

A 修改web.conf配置文件

查看/opt/splunkforwarder/etc/system/local/web.conf文件是否存在

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[root@linux_mysql local]# ll /opt/splunkforwarder/etc/system/local/
web.conf
-rw-r--r--. 1 root root 52101 Jul  4 00:07 /opt/splunkforwarder/etc/system/local/web.conf
[root@linux_mysql local]#

如果web.conf文件不存在将../default/下面的web.conf 复制到local目录下

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cd /opt/splunkforwarder/etc/system/local/
cp ../default/web.conf .

找到mgmtHostPort配置项并修改

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#   Version 7.2.5
# DO NOT EDIT THIS FILE!
# Changes to default files will be lost on update and are difficult to
# manage and support.
#
# Please make any changes to system defaults by overriding them in
# apps or $SPLUNK_HOME/etc/system/local
# (See "Configuration file precedence" in the web documentation).
#
# To override a specific setting, copy the name of the stanza and
# setting to the file where you wish to override it.
#
# This file contains possible attributes and values you can use to configure Splunk's web interface.
#
[default]

[settings]

# enable/disable the appserver
startwebserver = 1

# port number tag is missing or 0 the server will NOT start an http listener
# this is the port used for both SSL and non-SSL (we only have 1 port now).
httpport = 8000

# this determines whether to start SplunkWeb in http or https.
enableSplunkWebSSL = false

# location of splunkd; don't include http[s]:// in this anymore.
#mgmtHostPort = 127.0.0.1:8089--此项配置
mgmtHostPort = 127.0.0.1:8099

# list of ports to start python application servers on (although usually
# one port is enough)  Set to 0 to instead run the application server
# directly as the web front end on 'httpport', separate from splunkd.
appServerPorts = 8065

# default timeout, in seconds, when communicating with splunkd
splunkdConnectionTimeout = 30

# enable/disable custom netloc when using http client
enableSplunkWebClientNetloc = False

# SSL certificate files.
privKeyPath = $SPLUNK_HOME/etc/auth/splunkweb/privkey.pem
serverCert = $SPLUNK_HOME/etc/auth/splunkweb/cert.pem

B 重启splunkforwarder服务

/opt/splunkforwarder/bin/splunk start

C 查看端口是否修改成功

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ps -ef|grep splunk
[root@linux_mysql local]# ps -ef|grep splunk
root       7698      1  0 00:10 ?        00:00:01 splunkd --under-systemd --systemd-delegate=yes -p 8099 _internal_launch_under_systemd
root       7723   7698  0 00:10 ?        00:00:00 [splunkd pid=7698] splunkd --under-systemd --systemd-delegate=yes -p 8099 _internal_launch_under_systemd [process-runner]
root       7949   5126  0 00:28 pts/0    00:00:00 grep --color=auto splunk
[root@linux_mysql local]#

0x02 Splunk_TA_nix不能执行CPU.sh问题

问题：Splunk_TA_nix add-on下发到Linux Centos7系统上没有采集到cpu性能数据,发现缺少相关命令需要在linux系统上安装以下命令

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yum install sysstat
yum install sar
yum insatll mpstat

0x03 SplunkUF系统克隆导致主机名和GUID相同

A 方式一

删除 $SPLUNK$/etc/instance.cfg (里面记录了guid，也就是客户端名称)
删除 server.conf里面的实例名称记录，inputs.conf里面的主机名称记录
重启 forwarder服务

B 方式二

重新安装SplunkUniversalForwarder

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# 例如： 安装目录为/tpdata
/tpdata/splunkforwarder/bin/splunk stop
rm -rf  /tpdata/splunkforwarder
tar zxvf /tpdata/splunkforwarder-6*.tgz -C /tpdata
/tpdata/splunkforwarder/bin/splunk start --answer-yes --no-prompt --accept-license
/tpdata/splunkforwarder/bin/splunk set deploy-poll 10.21.8.228:8089 -auth admin:changeme
/tpdata/splunkforwarder/bin/splunk restart

C 方法三

基于splunk clone-prep-clear-config命令清除splunk配置信息创建Linux和Windows脚本

提示：不能修改脚本名称，查找进程是否运行使用Splunk关键字进行查找

linux：clear-Splunkforwarder-config.sh

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#!/bin/sh
#
# Time    : 2022/01/12 22:41:30
# Author  : Hesc
# Version : 1.0

# Splunkforwarder安装路径
Splunkforwarder_DIR="/opt"
# Splunkforwarder PID
Splunkforwarder_PID=`ps -ef|grep splunk | grep -v grep | awk '{print $2}'`

if [ -n "$Splunkforwarder_PID" ]; then
    echo -e "\033[42;30mINFO: Splunkforwarder guid info:\033[0m"
    cat $Splunkforwarder_DIR/splunkforwarder/etc/instance.cfg
    echo -e "\033[41;30mERROR: Splunkforwarder is runing, Stop Splunkforwarder!\033[0m"
    $Splunkforwarder_DIR/splunkforwarder/bin/splunk stop  # 停止splunkforwarder服务
    echo -e "\033[42;30mINFO: clear Splunkforwarder config!\033[0m"
    $Splunkforwarder_DIR/splunkforwarder/bin/splunk clone-prep-clear-config  # 清除splunkforwarder配置
    echo -e "\033[42;30mINFO: Start Splunkforwarder\033[0m"
    $Splunkforwarder_DIR/splunkforwarder/bin/splunk start  # 启动splunkforwarder服务
    echo -e "\033[42;30mINFO: Update Splunkforwarder guid info:\033[0m"
    cat $Splunkforwarder_DIR/splunkforwarder/etc/instance.cfg
else
    echo -e "\033[42;30mINFO: Splunkforwarder guid info:\033[0m"
    cat $Splunkforwarder_DIR/splunkforwarder/etc/instance.cfg
    echo -e "\033[42;30mINFO: Splunkforwarder is not runing, clear Splunkforwarder config!\033[0m"
    $Splunkforwarder_DIR/splunkforwarder/bin/splunk clone-prep-clear-config  # 清除splunkforwarder配置
    echo -e "\033[42;30mINFO: Start Splunkforwarder\033[0m"
    $Splunkforwarder_DIR/splunkforwarder/bin/splunk start  # 启动splunkforwarder服务
    echo -e "\033[42;30mINFO: Update Splunkforwarder guid info:\033[0m"
    cat $Splunkforwarder_DIR/splunkforwarder/etc/instance.cfg
fi

Windows：clear-Splunkforwarder-config.bat

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@echo off 

:: Time    : 2022/01/12 22:41:30
:: Author  : Hesc
:: Version : 1.0

set SplunkUniversalForwarder_install_dir="C:\Program Files"

tasklist|find /i "splunkd.exe"
if %errorlevel%==0 ( 
	echo "ERROR: SplunkUniversalForwarder is runing,Stop SplunkUniversalForwarder !!"
	"C:\Program Files\SplunkUniversalForwarder\bin\splunk.exe" stop
	"C:\Program Files\SplunkUniversalForwarder\bin\splunk.exe" clone-prep-clear-config
	"C:\Program Files\SplunkUniversalForwarder\bin\splunk.exe" start
) else (
	echo "INFO: SplunkUniversalForwarder is not runing,clear SplunkUniversalForwarder config !!"
	"C:\Program Files\SplunkUniversalForwarder\bin\splunk.exe" clone-prep-clear-config
	"C:\Program Files\SplunkUniversalForwarder\bin\splunk.exe" start
)

pause

0x04 修改每个CPU的最大并发搜索次数

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vim /opt/splunk/system/local/limits.conf
cat /opt/splunk/system/local/limits.conf

[search] 
max_searches_per_cpu = 1 # 默认值为1
# 每个CPU的最大并发搜索次数

0x05 关于Splunk 重启日志也会存放在index里面

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index="_internal" source="/opt/splunk/var/log/splunk/splunkd.log" start

0x06 查看告警邮箱是否发送

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INFO：为正常发送，ERROR：为发送失败  >>要检查ERROR报错的问题
index ="_internal" source="/opt/splunk/var/log/splunk/python.log" "mail"

0x07 关于字段重命名注意点

字段重命名：不能设置多个字段名称重命名为同一个字段名称

重写字段值：如果有设置多个字段名称重命名为同一个字段名称，使用勾选此选项字段重命名。

0x08 仪表板设置隐藏图表(并传递传递参数)

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<row>
    <panel> depends="$range$"
        <table>
            <title>僵尸进程详情</title>
        </table>
    </panel>
</row>

0x09 Splunk web刷新配置文件url

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http://192.168.10.9:8000/zh-CN/debug/refresh

0x0a 修改index存放路径

A 修改splunk-launch.conf配置文件

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] vim /opt/splunk/splunk/etc/splunk-launch.conf
--编辑splunk-launch文件
] cat /opt/splunk/splunk/etc/splunk-launch.conf
#   Version 7.2.5

# Modify the following line to suit the location of your Splunk install.
# If unset, Splunk will use the parent of the directory containing the splunk
# CLI executable.
#
# SPLUNK_HOME=/opt/splunk-home
# By default, Splunk stores its indexes under SPLUNK_HOME in the
# var/lib/splunk subdirectory.  This can be overridden
# here:
# SPLUNK_DB=/opt/splunk-home/var/lib/splunk
# 添加以下内容
SPLUNK_DB=/opt/splunk/splunk/data

# Splunkd daemon name
SPLUNK_SERVER_NAME=Splunkd

# Splunkweb daemon name
SPLUNK_WEB_NAME=splunkweb

# If SPLUNK_OS_USER is set, then Splunk service will only start
# if the 'splunk [re]start [splunkd]' command is invoked by a user who
# is, or can effectively become via setuid(2), $SPLUNK_OS_USER.
# (This setting can be specified as username or as UID.)
# SPLUNK_OS_USER

B 创建数据保存目录

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] mkdir data
--创建data目录 
] splunk stop
--停止splunk服务
] mv /opt/splunk/splunk/var/lib/splunk /opt/splunk/splunk/data/
--将/opt/splunk/splunk/var/lib/splunk目录下的文件移动到/opt/splunk/splunk/data/目录下
] splunk start
--启动服务

0x0b Splunk License 文件保存路径

$SPLUNK_HOME/etc/licenses/enterprise/Splunk.License.lic

0x0c outputlookup小技巧

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index=wineventlog 
| lookup AXA_Server_List Segment as 源网络地址 OUTPUT 分公司区域 机构 省份 Region 
| search Region=* 
| stats count by 分公司区域 省份 Region 源网络地址 username 
| search username!="-" username !="ANONYMOUS LOGON" username!=admin* 
| rename 源网络地址 as IP username as nt_host 
| rex field=nt_host "(?P<nt_host>[^$]*)" 
| eval nt_host=upper(nt_host) 
| lookup AXA_ServerIP_List.csv IP nt_host OUTPUT IP as ip 
| search NOT ip=* 
| fields - ip count 
| outputlookup AXA_ServerIP_List.csv append=true

0x0d 创建UF资产表SPL

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index="_internal" sourcetype="splunkd" source="*metrics.log" fwdType=uf source="/opt/splunk/var/log/splunk/metrics.log" 
| stats count by hostname,sourceIp,os,arch,guid

0x0e Splunk enterprise security CLI安装命令

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curl -k -u admin:Eccom@123 https://localhost:8089/services/apps/local -d filename="true" -d name="/opt/splunk-enterprise-security_700.spl" -d update="true" -v

0x0f Splunk 修改密码

A Splunk 7.1以下版本修改admin密码

如果忘记管理员密码，可以重置。需要有服务器的访问权限。

方法

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1.将\$SPLUNK_HOME/etc/passwd文件重命名为passwd.bak
] mv /opt/splunk/etc/passwd passwd.bak
2.重新启动Splunk，此时登录Splunk Web之后，所使用的密码则为初始账号密码：admin changeme
] /opt/splunk/bin/splunk restatr

B Splunk 7.1以上版本修改admin密码

如果您使用的是Splunk 7.1以上的版本，需要使用<user-seed.conf 创建管理员凭据>方法重置admin密码。

在7.1以前的版本中，缺少$SPLUNK_HOME/etc/passwd文件, Splunk会将密码重置为”changeme”。但是在7.1上版本此方法已失效。

1. 您需要保存$SPLUNK_HOME/etc/passwd文件，并删除原始文件。

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mv $SPLUNK_HOME/etc/passwd $SPLUNK_HOME/etc/passwd-bak

2.编辑$SPLUNK_HOME/etc/system/local/user-seed.conf配置文件(不存在则新建)。
添加一个名为[user_info]章节，并指定管理员用户和您希望使用的密码。

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[user_info]
USERNAME=admin
PASSWORD=password

3.然后重新启动Splunk，将会生成一个新的$SPLUNK_HOME/etc/passwd文件。

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splunk restart

0x0G 重新采集数据方法

  • 针对单个日志文件
    • stop splunk
    • splunk cmd btprobe -d $SPLUNK_DB/fishbucket/splunk_private_db –file <source> –reset
    • start splunk
  • 全部日志文件
    • stop splunk
    • splunk clean eventdata -index _thefishbucket
    • rm -rf $SPLUNK_DB/fishbucket
    • start splunk

Splunk
#日常笔记 #Linux #Splunk
Splunk奇巧淫技那些事
https://hesc.info/3ce98b4c8781/
作者
需要哈气的纸飞机
发布于
2024年7月7日
许可协议