{"id":209396,"date":"2025-09-30T09:11:42","date_gmt":"2025-09-30T01:11:42","guid":{"rendered":"https:\/\/www.server.hk\/blog\/209396\/"},"modified":"2025-09-30T09:11:43","modified_gmt":"2025-09-30T01:11:43","slug":"vps-262","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/209396\/","title":{"rendered":"\u9999\u6e2fVPS\u5b89\u5168\u5ba1\u8ba1\u5b9e\u6218\uff1a\u7528 auditd \u5b9e\u73b0\u65e5\u5fd7\u76d1\u63a7\u4e0e\u5165\u4fb5\u6eaf\u6e90"},"content":{"rendered":"<p>\u5728\u4e91\u7aef\u6258\u7ba1\u4e0e\u81ea\u5efa\u5e73\u53f0\u5e76\u884c\u7684\u4eca\u5929\uff0c\u7ad9\u957f\u4e0e\u4f01\u4e1a\u8fd0\u8425\u8005\u9762\u5bf9\u7684\u5b89\u5168\u5a01\u80c1\u66f4\u52a0\u591a\u6837\u5316\u3002\u9488\u5bf9\u9999\u6e2fVPS\u3001\u7f8e\u56fdVPS\u4e43\u81f3\u672c\u5730\u9999\u6e2f\u670d\u52a1\u5668\u73af\u5883\uff0c\u505a\u597d\u4e3b\u673a\u5c42\u9762\u7684\u5ba1\u8ba1\u4e0e\u65e5\u5fd7\u76d1\u63a7\u662f\u5165\u4fb5\u6eaf\u6e90\u4e0e\u5408\u89c4\u5fc5\u5907\u5de5\u4f5c\u3002\u672c\u6587\u56f4\u7ed5 Linux \u5185\u6838 Audit \u5b50\u7cfb\u7edf\u4e0e auditd \u670d\u52a1\u5c55\u5f00\uff0c\u7ed3\u5408\u5b9e\u6218\u914d\u7f6e\u3001\u89c4\u5219\u793a\u4f8b\u4e0e\u6eaf\u6e90\u6d41\u7a0b\uff0c\u5e2e\u52a9\u8fd0\u7ef4\u4e0e\u5f00\u53d1\u56e2\u961f\u5728 VPS\uff08\u5305\u62ec\u9999\u6e2fVPS\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u7b49\u90e8\u7f72\u573a\u666f\uff09\u4e0a\u5efa\u7acb\u53ef\u7528\u3001\u53ef\u5ba1\u8ba1\u7684\u5b89\u5168\u4f53\u7cfb\u3002<\/p>\n<h2>\u4e3a\u4ec0\u4e48\u9009\u62e9\u5185\u6838\u5ba1\u8ba1\uff08auditd\uff09\u4f5c\u4e3a\u65e5\u5fd7\u76d1\u63a7\u4e0e\u6eaf\u6e90\u624b\u6bb5<\/h2>\n<p>\u5185\u6838\u7ea7\u5ba1\u8ba1\u901a\u8fc7\u94a9\u5165\u7cfb\u7edf\u8c03\u7528\uff08syscall\uff09\u4e0e\u5173\u952e\u5185\u6838\u4e8b\u4ef6\uff0c\u80fd\u591f\u6355\u83b7\u6bd4\u5e94\u7528\u65e5\u5fd7\u66f4\u5e95\u5c42\u3001\u66f4\u53ef\u4fe1\u7684\u884c\u4e3a\u8bc1\u636e\u3002\u4e0e\u4ec5\u76d1\u63a7\u5e94\u7528\u65e5\u5fd7\u6216\u4f9d\u8d56 IDS \u4e0d\u540c\uff0cauditd \u63d0\u4f9b\uff1a<\/p>\n<ul>\n<li><strong>\u7cfb\u7edf\u8c03\u7528\u7ea7\u522b\u7684\u4e8b\u4ef6\u8bb0\u5f55<\/strong>\uff08\u5982 execve\u3001open\u3001unlink\u3001chmod\u3001settimeofday \u7b49\uff09\uff0c\u4fbf\u4e8e\u8fd8\u539f\u653b\u51fb\u94fe\u4e0e\u8fdb\u7a0b\u6267\u884c\u94fe\u3002<\/li>\n<li><strong>\u4e0d\u53ef\u7be1\u6539\u6027\u66f4\u5f3a<\/strong>\u7684\u5ba1\u8ba1\u6765\u6e90\uff1a\u7531\u5185\u6838\u76f4\u63a5\u8f93\u51fa\uff0c\u653b\u51fb\u8005\u96be\u4ee5\u5728\u7528\u6237\u6001\u5b8c\u5168\u8986\u76d6\u3002<\/li>\n<li>\u53ef\u914d\u5408\u73b0\u6709\u65e5\u5fd7\u805a\u5408\uff08rsyslog\u3001Graylog\u3001ELK\uff09\u5b9e\u73b0\u591a\u5730\u57df\u3001\u8de8\u673a\u623f\uff08\u4f8b\u5982\u5c06\u9999\u6e2f\u670d\u52a1\u5668\u5ba1\u8ba1\u65e5\u5fd7\u7edf\u4e00\u6c47\u805a\u5230\u4f4d\u4e8e\u7f8e\u56fd\u7684 SIEM\uff09\u5206\u6790\u3002<\/li>\n<\/ul>\n<h3>\u542f\u52a8\u524d\u7684\u5185\u6838\u4e0e\u670d\u52a1\u68c0\u67e5<\/h3>\n<p>\u5728\u5f00\u59cb\u4e4b\u524d\uff0c\u786e\u4fdd\u5185\u6838\u542f\u7528\u4e86 audit \u652f\u6301\u3002\u5e38\u89c1\u68c0\u67e5\u9879\uff1a<\/p>\n<ul>\n<li>\u67e5\u770b\u5185\u6838\u542f\u52a8\u53c2\u6570\uff1a\/proc\/cmdline \u4e2d\u662f\u5426\u542b\u6709 audit=1\uff1b\u82e5\u65e0\uff0c\u53ef\u5728 grub \u4e2d\u8ffd\u52a0\u5e76\u66f4\u65b0\u5185\u6838\u53c2\u6570\u3002<\/li>\n<li>\u670d\u52a1\u72b6\u6001\uff1asystemctl status auditd\uff1b\u82e5\u672a\u5b89\u88c5\uff0c\u53ef\u5728 Debian\/Ubuntu \u4e0a sudo apt install auditd\uff1b\u5728 CentOS\/RHEL \u4e0a sudo yum install audit\u3002<\/li>\n<li>\u786e\u8ba4\u65e5\u5fd7\u6587\u4ef6\u8def\u5f84\uff1a\/var\/log\/audit\/audit.log\uff08\u9ed8\u8ba4\uff09\u3002<\/li>\n<\/ul>\n<h2>\u5b9e\u6218\u914d\u7f6e\u4e0e\u89c4\u5219\u8bbe\u8ba1<\/h2>\n<p>\u5ba1\u8ba1\u89c4\u5219\u8981\u5728\u7cbe\u786e\u4e0e\u8986\u76d6\u4e4b\u95f4\u53d6\u5e73\u8861\uff1a\u8fc7\u5bbd\u4f1a\u4ea7\u751f\u6d77\u91cf\u65e5\u5fd7\u5f71\u54cd\u6027\u80fd\u4e0e\u5b58\u50a8\uff0c\u8fc7\u7a84\u53ef\u80fd\u9057\u6f0f\u5173\u952e\u884c\u4e3a\u3002\u4e0b\u9762\u7ed9\u51fa\u4e00\u5957\u9002\u7528\u4e8e VPS\uff08\u5305\u62ec\u9999\u6e2fVPS \u6216 \u7f8e\u56fdVPS\uff09\u5e38\u89c1\u5a01\u80c1\u573a\u666f\u7684\u5b9e\u6218\u89c4\u5219\u96c6\u5408\u4e0e\u8bf4\u660e\u3002<\/p>\n<h3>\u57fa\u7840\u89c4\u5219\u793a\u4f8b<\/h3>\n<p>\u5c06\u8fd9\u4e9b\u89c4\u5219\u5199\u5165 \/etc\/audit\/rules.d\/50-security.rules \u6216\u4f7f\u7528 auditctl \u4e34\u65f6\u52a0\u8f7d\uff1a<\/p>\n<ul>\n<li>\u8bb0\u5f55\u6240\u6709 execve \u8c03\u7528\uff08\u91cd\u8981\u7684\u8fdb\u7a0b\u542f\u52a8\u5ba1\u8ba1\uff09\uff1a<br \/>\n<code>-a exit,always -F arch=b64 -S execve -k exec_log<\/code><\/li>\n<li>\u76d1\u63a7 \/etc\/passwd\u3001\/etc\/shadow\u3001\/etc\/sudoers \u6587\u4ef6\u4fee\u6539\uff1a<br \/>\n<code>-w \/etc\/passwd -p wa -k identity_changes<br \/>-w \/etc\/shadow -p wa -k identity_changes<br \/>-w \/etc\/sudoers -p wa -k sudo_changes<\/code><\/li>\n<li>\u76d1\u63a7 crontab \u4e0e systemd \u5355\u5143\u7684\u4fee\u6539\uff08\u6301\u4e45\u5316\u540e\u95e8\u5e38\u89c1\u76ee\u6807\uff09\uff1a<br \/>\n<code>-w \/etc\/crontab -p wa -k cron_changes<br \/>-w \/etc\/systemd\/system -p wa -k systemd_changes<\/code><\/li>\n<li>\u76d1\u63a7\u5173\u952e\u4e8c\u8fdb\u5236\u6587\u4ef6\u7684\u5199\u64cd\u4f5c\uff08\u5982 \/usr\/bin\/ssh\u3001\/bin\/bash\uff09\uff1a<br \/>\n<code>-w \/usr\/bin\/ssh -p wa -k bin_tamper<br \/>-w \/bin\/bash -p wa -k bin_tamper<\/code><\/li>\n<li>\u76d1\u63a7 mount\/umount\uff08\u53ef\u7528\u4e8e\u8bc6\u522b\u53ef\u7591\u5377\u6302\u8f7d\uff09\uff1a<br \/>\n<code>-a exit,always -S mount -S umount -k mount_ops<\/code><\/li>\n<\/ul>\n<p>\u8bf4\u660e\uff1a<strong>-w<\/strong> \u662f\u6587\u4ef6\u76d1\u63a7\uff08watch\uff09\uff0c\u9002\u7528\u4e8e\u6587\u4ef6\u7ea7\u522b\u7684\u5199\/\u5c5e\u6027\/\u6267\u884c\u76d1\u63a7\uff1b<strong>-S<\/strong> \u7ed3\u5408\u7cfb\u7edf\u8c03\u7528\u7528\u4e8e\u66f4\u5e7f\u6cdb\u7684\u7cfb\u7edf\u884c\u4e3a\u76d1\u63a7\uff1b<strong>-k<\/strong> \u7528\u4e8e\u7ed9\u4e8b\u4ef6\u6253\u4e0a\u4fbf\u4e8e\u67e5\u8be2\u7684\u5173\u952e\u5b57\u3002<\/p>\n<h3>\u7cbe\u51c6\u6eaf\u6e90\u7684\u8fdb\u9636\u89c4\u5219<\/h3>\n<p>\u4e3a\u4e86\u8ffd\u8e2a\u653b\u51fb\u94fe\u4e0a\u6bcf\u4e00\u6b65\u7684\u8fdb\u7a0b\u94fe\u4e0e\u7f51\u7edc\u884c\u4e3a\uff0c\u53ef\u4ee5\u7ed3\u5408\u4e0b\u5217\u89c4\u5219\uff1a<\/p>\n<ul>\n<li>\u8bb0\u5f55\u7f51\u7edc\u76f8\u5173 syscalls\uff08connect\u3001accept\u3001bind\uff09\uff1a<br \/>\n<code>-a exit,always -F arch=b64 -S connect -S accept -S bind -k net_ops<\/code><\/li>\n<li>\u8bb0\u5f55\u6743\u9650\u53d8\u66f4\u4e0e\u80fd\u529b\u63d0\u5347\uff08setuid\u3001setgid\u3001capset\uff09\uff1a<br \/>\n<code>-a exit,always -F arch=b64 -S setuid -S setgid -S setresuid -S setresgid -k priv_ops<\/code><\/li>\n<li>\u4f7f\u7528 -F auid!=4294967295 \u9650\u5236\u4ec5\u8bb0\u5f55\u771f\u5b9e\u767b\u5f55\u7528\u6237\u7684\u884c\u4e3a\uff08\u6392\u9664\u5185\u6838\u6216\u533f\u540d\u7528\u6237\u566a\u97f3\uff09\uff1a<br \/>\n<code>-a exit,always -F arch=b64 -S execve -F auid&gt;=1000 -F auid!=4294967295 -k user_exec<\/code><\/li>\n<\/ul>\n<h2>\u65e5\u5fd7\u6536\u96c6\u3001\u68c0\u7d22\u4e0e\u6eaf\u6e90\u6d41\u7a0b<\/h2>\n<p>\u6709\u4e86\u5ba1\u8ba1\u65e5\u5fd7\uff0c\u5173\u952e\u5728\u4e8e\u5982\u4f55\u5feb\u901f\u5b9a\u4f4d\u8bc1\u636e\u3002\u5e38\u7528\u5de5\u5177\u4e0e\u6b65\u9aa4\uff1a<\/p>\n<h3>\u5e38\u7528\u547d\u4ee4<\/h3>\n<ul>\n<li>ausearch \u2014 \u57fa\u4e8e\u65f6\u95f4\u3001\u5173\u952e\u5b57\u3001\u4e8b\u4ef6\u7c7b\u578b\u68c0\u7d22\u3002\u4f8b\u5982\u67e5\u627e\u5173\u952e\u5b57\u4e3a exec_log \u7684\u4e8b\u4ef6\uff1a<br \/>\n<code>ausearch -k exec_log -ts today -i<\/code><\/li>\n<li>aureport \u2014 \u751f\u6210\u6c47\u603b\u62a5\u544a\uff0c\u5982\u6309\u7528\u6237\u3001\u6309\u547d\u4ee4\u7edf\u8ba1\uff1a<br \/>\n<code>aureport --summary<\/code><\/li>\n<li>auparse\uff08libaudit \u63d0\u4f9b\uff09\u6216\u7b2c\u4e09\u65b9\u811a\u672c\uff0c\u5c06 audit.log \u89e3\u6790\u5e76\u8f93\u51fa JSON \u4fbf\u4e8e ELK\/Graylog \u63a5\u6536\u3002<\/li>\n<\/ul>\n<h3>\u6eaf\u6e90\u5b9e\u4f8b<\/h3>\n<p>\u573a\u666f\uff1a\u53d1\u73b0\u5f02\u5e38\u8fdb\u7a0b \/tmp\/.xyz \u6b63\u5728\u53d1\u8d77\u5916\u8fde\u3002\u6d41\u7a0b\u793a\u4f8b\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528 ps\/ss \u786e\u8ba4\u8fdb\u7a0b PID \u4e0e\u7f51\u7edc\u8fde\u63a5\u3002<\/li>\n<li>\u5728 audit \u65e5\u5fd7\u4e2d\u68c0\u7d22\u8be5 PID \u7684 execve \u4e0e open \u8bb0\u5f55\uff1a<br \/>\n<code>ausearch -p  -i<\/code><\/li>\n<li>\u8ddf\u8e2a\u8be5\u8fdb\u7a0b\u7684\u7236\u8fdb\u7a0b\u94fe\uff08ppid \u5b57\u6bb5\uff09\u4e0e auid\uff08\u767b\u5f55\u7528\u6237\uff09\uff1a\u901a\u8fc7 ausearch \u8f93\u51fa\u7684 ppid\u3001pid\u3001exe \u5b57\u6bb5\u8fd8\u539f\u8c03\u7528\u94fe\u3002<\/li>\n<li>\u68c0\u7d22\u8be5\u7528\u6237\u5728\u5f53\u5929\u7684\u5176\u4ed6 exec \u8bb0\u5f55\uff1a<br \/>\n<code>ausearch -ua  -ts today -k user_exec -i<\/code><\/li>\n<li>\u7ed3\u5408\u7f51\u7edc\u65e5\u5fd7\uff08\u5982 \/var\/log\/syslog\u3001rsyslog \u8f6c\u53d1\u7684 SIEM \u4e2d\u7684\u6570\u636e\uff09\u786e\u8ba4\u5916\u90e8 IP \u4e0e\u65f6\u95f4\u7a97\u53e3\u3002<\/li>\n<\/ul>\n<h2>\u6027\u80fd\u4e0e\u5b58\u50a8\u8003\u91cf<\/h2>\n<p>\u5728 VPS \u73af\u5883\uff08\u65e0\u8bba\u662f\u9999\u6e2f\u670d\u52a1\u5668\u8fd8\u662f\u7f8e\u56fdVPS\uff09\u4e0a\uff0c\u5ba1\u8ba1\u4f1a\u5e26\u6765 CPU \u4e0e\u78c1\u76d8\u5199\u5165\u538b\u529b\uff0c\u9700\u6743\u8861\uff1a<\/p>\n<ul>\n<li>\u7cbe\u7ec6\u5316\u89c4\u5219\u4f18\u5148\u4e8e\u5168\u91cf\u8bb0\u5f55\u3002\u4f18\u5148\u76d1\u63a7\u9ad8\u98ce\u9669\u8def\u5f84\uff08\/etc\u3001\/usr\/bin\u3001\/var\/spool\/cron\uff09\u4e0e\u5173\u952e syscall\u3002<\/li>\n<li>\u4f7f\u7528 rate limiting\uff1aauditd \u53ef\u914d\u7f6e backlog_limit \u4e0e max_log_file \u53c2\u6570\uff0c\u907f\u514d\u56e0\u65e5\u5fd7\u6cdb\u6ee5\u5bfc\u81f4\u7cfb\u7edf\u5361\u987f\u3002<\/li>\n<li>\u5b9a\u671f\u8f6e\u8f6c\u4e0e\u5f52\u6863\uff1a\u7ed3\u5408 auditd \u7684 max_log_file_action\uff08rotate\/keep_logs\uff09\u4e0e rsyslog\/Logrotate\uff0c\u5c06\u5386\u53f2\u65e5\u5fd7\u5f02\u5730\u5907\u4efd\u5230\u96c6\u4e2d\u5b58\u50a8\u6216 SIEM\u3002<\/li>\n<\/ul>\n<h2>\u4e0e\u96c6\u4e2d\u5316\u65e5\u5fd7\u4e0e SIEM \u7684\u96c6\u6210<\/h2>\n<p>\u4ec5\u672c\u5730\u5ba1\u8ba1\u65e5\u5fd7\u4e0d\u8db3\u4ee5\u652f\u6491\u8de8\u673a\u623f\u5a01\u80c1\u72e9\u730e\uff0c\u5efa\u8bae\u5c06\u65e5\u5fd7\u96c6\u4e2d\u5316\uff1a<\/p>\n<ul>\n<li>\u901a\u8fc7 rsyslog \u6216 audispd \u63d2\u4ef6\u5c06 \/var\/log\/audit\/audit.log \u8f6c\u53d1\u81f3\u8fdc\u7aef\u65e5\u5fd7\u670d\u52a1\u5668\uff08\u53ef\u4f4d\u4e8e\u4e0d\u540c\u5730\u533a\uff0c\u6bd4\u5982\u5c06\u9999\u6e2f\u670d\u52a1\u5668\u7684\u5ba1\u8ba1\u65e5\u5fd7\u6c47\u805a\u5230\u4f4d\u4e8e\u7f8e\u56fd\u7684 SIEM\uff09\u3002<\/li>\n<li>\u8f93\u51fa\u683c\u5f0f\u5316\u4e3a JSON\uff0c\u65b9\u4fbf\u5728 ELK\/Graylog \u4e2d\u5efa\u7acb\u4eea\u8868\u76d8\u4e0e\u544a\u8b66\u89c4\u5219\uff08\u5982\u9891\u7e41\u7684 execve\u3001\u6765\u81ea\u5f02\u5e38\u56fd\u5bb6\u7684\u7f51\u7edc\u8fde\u63a5\u7b49\uff09\u3002<\/li>\n<li>\u7ed3\u5408\u4e3b\u673a\u5165\u4fb5\u68c0\u6d4b\uff08\u5982 AIDE\uff09\u4e0e\u6f0f\u6d1e\u626b\u63cf\u7ed3\u679c\uff0c\u5b9e\u73b0\u4e8b\u4ef6\u5173\u8054\u4e0e\u6eaf\u6e90\u3002<\/li>\n<\/ul>\n<h2>\u4f18\u52bf\u5bf9\u6bd4\u4e0e\u9009\u8d2d\u5efa\u8bae<\/h2>\n<p>\u5728\u9009\u62e9\u90e8\u7f72\u5730\u70b9\uff08\u9999\u6e2f\u670d\u52a1\u5668\u3001\u7f8e\u56fdVPS\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u7b49\uff09\u4e0e\u4ea7\u54c1\u65f6\uff0c\u9664\u4e86\u4ef7\u683c\u548c\u5e26\u5bbd\uff0c\u8fd8\u9700\u8003\u8651\u5ba1\u8ba1\u90e8\u7f72\u7684\u53ef\u884c\u6027\u4e0e\u5408\u89c4\u6027\uff1a<\/p>\n<ul>\n<li><strong>\u7f51\u7edc\u5ef6\u8fdf\u4e0e\u5e26\u5bbd<\/strong>\uff1a\u82e5\u4f60\u8981\u5c06\u65e5\u5fd7\u5b9e\u65f6\u8f6c\u53d1\u5230\u8fdc\u7aef SIEM\uff0c\u9009\u62e9\u79bb\u5206\u6790\u8282\u70b9\u66f4\u8fd1\u7684 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