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Linux审计日志介绍

  • 2026-02-19 17:31:17
Linux审计日志介绍

日志路径 

/var/log/secure

用途:用户登录/注销、SSH 访问尝试、sudo 特权操作、su 用户切换等认证授权事件

详解 

"authentication failure"
含义:认证过程中的任何一种失败,可能是因为密码错误、公钥不匹配、认证方法不支持等。
常见场景:SSH登录、数据库连接等多种需要认证的场景。


"Failed password for"
含义:用户的密码验证失败,可能是由于输入了错误的密码。
常见场景:SSH登录、数据库连接等需要密码验证的场景。


"Did not receive identification string from"
含义:非SSH客户端的连接尝试:可能是某个程序(如 HTTP、FTP 等非 SSH 协议的客户端)意外地连接到 SSH 服务端,导致没有发送 SSH 协议标识符。
常见场景:
恶意扫描或攻击:一些恶意软件或攻击者可能在扫描服务器的开放端口,试图发现哪些端口在运行 SSH 服务。这类扫描器通常不会发送合法的 SSH 协议标识符,导致服务器记录该条日志。
端口网络拨测:如果你的网络中有自动化脚本、负载均衡器、或其他设备试图连接到服务器,并没有按照正确的 SSH 协议进行通信,支持测试
22端口是否开放,也会触发该日志。

日志输出到日志服务器 

[root@qb~]# cat /etc/rsyslog.conf |grep auth |grep -v "^#"*.info;mail.none;authpriv.none;cron.none                /var/log/messages
authpriv
.*/var/log/secure  
#默认配置,Linux认证授权日志保存路径
authpriv
.*;*.emerg;kern.*@log.lzhou.cc  #新增配置,让日志发送日志服务器

日志清洗 

日志分析 

可以分析源ip,目标ip,尝试登录账号及登录时间等字段

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  2. 运行时间 : 0.317517s [ 吞吐率:3.15req/s ] 内存消耗:4,520.25kb 文件加载:140
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  139. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/runtime/temp/067d451b9a0c665040f3f1bdd3293d68.php ( 11.98 KB )
  140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000783s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001296s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.012579s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001883s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001507s ]
  6. SELECT * FROM `set` [ RunTime:0.002393s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001570s ]
  8. SELECT * FROM `article` WHERE `id` = 475333 LIMIT 1 [ RunTime:0.016873s ]
  9. UPDATE `article` SET `lasttime` = 1772240298 WHERE `id` = 475333 [ RunTime:0.002882s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000795s ]
  11. SELECT * FROM `article` WHERE `id` < 475333 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.014185s ]
  12. SELECT * FROM `article` WHERE `id` > 475333 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.010718s ]
  13. SELECT * FROM `article` WHERE `id` < 475333 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.027809s ]
  14. SELECT * FROM `article` WHERE `id` < 475333 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.023073s ]
  15. SELECT * FROM `article` WHERE `id` < 475333 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009074s ]
0.323159s