{"id":61754,"date":"2025-04-29T14:24:54","date_gmt":"2025-04-29T06:24:54","guid":{"rendered":"https:\/\/fwq.ai\/blog\/61754\/"},"modified":"2025-04-29T14:24:54","modified_gmt":"2025-04-29T06:24:54","slug":"%e5%a6%82%e4%bd%95%e9%85%8d%e7%bd%aecentos%e7%b3%bb%e7%bb%9f%e4%bb%a5%e9%99%90%e5%88%b6%e5%b9%b6%e5%8f%91%e8%bf%9e%e6%8e%a5%e5%92%8c%e9%98%b2%e6%ad%a2%e6%8b%92%e7%bb%9d%e6%9c%8d%e5%8a%a1%e6%94%bb-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/61754\/","title":{"rendered":"\u5982\u4f55\u914d\u7f6eCentOS\u7cfb\u7edf\u4ee5\u9650\u5236\u5e76\u53d1\u8fde\u63a5\u548c\u9632\u6b62\u62d2\u7edd\u670d\u52a1\u653b\u51fb"},"content":{"rendered":"<p>\u5982\u4f55\u914d\u7f6ecentos\u7cfb\u7edf\u4ee5\u9650\u5236\u5e76\u53d1\u8fde\u63a5\u548c\u9632\u6b62\u62d2\u7edd\u670d\u52a1\u653b\u51fb<\/p>\n<p>\u62d2\u7edd\u670d\u52a1\u653b\u51fb\uff08Denial of Service\uff0cDoS\uff09\u662f\u7f51\u7edc\u5b89\u5168\u4e2d\u975e\u5e38\u5e38\u89c1\u7684\u4e00\u79cd\u653b\u51fb\u65b9\u5f0f\u3002\u653b\u51fb\u8005\u901a\u8fc7\u4e0d\u65ad\u7684\u5411\u76ee\u6807\u670d\u52a1\u5668\u53d1\u9001\u8bf7\u6c42\uff0c\u5360\u7528\u5927\u91cf\u7684\u7cfb\u7edf\u8d44\u6e90\uff0c\u4f7f\u5f97\u6b63\u5e38\u7528\u6237\u65e0\u6cd5\u8bbf\u95ee\u3002\u4e3a\u4e86\u9632\u6b62\u8fd9\u79cd\u653b\u51fb\uff0c\u6211\u4eec\u53ef\u4ee5\u5728CentOS\u7cfb\u7edf\u4e0a\u8fdb\u884c\u4e00\u4e9b\u914d\u7f6e\u6765\u9650\u5236\u5e76\u53d1\u8fde\u63a5\u6570\uff0c\u4fdd\u969c\u7cfb\u7edf\u7684\u7a33\u5b9a\u548c\u5b89\u5168\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u5728CentOS\u7cfb\u7edf\u4e0a\u8fdb\u884c\u914d\u7f6e\u7684\u6b65\u9aa4\u548c\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n<ol>\n<li>\u914d\u7f6eiptables<br \/>Iptables\u662f\u4e00\u4e2a\u5728Linux\u7cfb\u7edf\u4e0a\u63a7\u5236\u7f51\u7edc\u6570\u636e\u5305\u8f6c\u53d1\u7684\u5de5\u5177\u3002\u901a\u8fc7\u914d\u7f6eiptables\u89c4\u5219\uff0c\u53ef\u4ee5\u9650\u5236\u5e76\u53d1\u8fde\u63a5\uff0c\u8fc7\u6ee4\u6076\u610f\u6d41\u91cf\u3002\u5728\u7ec8\u7aef\u4e2d\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\uff0c\u914d\u7f6eiptables\u89c4\u5219\uff1a<\/li>\n<\/ol>\n<pre># \u6e05\u9664\u5df2\u6709\u7684iptables\u89c4\u5219\niptables -F\n\n# \u5141\u8bb8\u5df2\u5efa\u7acb\u7684\u8fde\u63a5\u548c\u76f8\u5173\u8bf7\u6c42\niptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT\n\n# \u9650\u5236\u5e76\u53d1\u8fde\u63a5\u6570\u4e3a100\uff0c\u5e76\u5141\u8bb8\u56de\u73af\u5730\u5740\u7684\u8bbf\u95ee\niptables -I INPUT -p tcp --syn --dport 80 -m connlimit --connlimit-above 100 -j DROP\niptables -I INPUT -i lo -j ACCEPT\n\n# \u5141\u8bb8SSH\u8fde\u63a5\niptables -I INPUT -p tcp --dport 22 -j ACCEPT\n\n# \u5141\u8bb8HTTP\u548cHTTPS\u8fde\u63a5\niptables -I INPUT -p tcp --dport 80 -j ACCEPT\niptables -I INPUT -p tcp --dport 443 -j ACCEPT\n\n# \u5176\u4ed6\u6240\u6709\u4e0d\u7b26\u5408\u89c4\u5219\u7684\u8fde\u63a5\u90fd\u5c06\u88ab\u62d2\u7edd\niptables -A INPUT -j REJECT\n\n# \u4fdd\u5b58iptables\u89c4\u5219\nservice iptables save<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<ol>\n<li>\u914d\u7f6eSYN Cookie<br \/>SYN Cookie\u662f\u4e00\u79cd\u62b5\u5fa1SYN Flood\u653b\u51fb\u7684\u673a\u5236\uff0c\u5b83\u53ef\u4ee5\u5728\u77ed\u65f6\u95f4\u5185\u5efa\u7acb\u5927\u91cf\u7684\u65e0\u6548\u8fde\u63a5\uff0c\u4ece\u800c\u4f7f\u5f97\u653b\u51fb\u8005\u7684\u653b\u51fb\u65e0\u6548\u5316\u3002\u5728CentOS\u7cfb\u7edf\u4e0a\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539\u5185\u6838\u53c2\u6570\u6765\u5f00\u542fSYN Cookie\u3002<\/li>\n<\/ol>\n<p>\u7f16\u8f91 \/etc\/sysctl.conf \u6587\u4ef6\uff0c\u6dfb\u52a0\u4ee5\u4e0b\u5185\u5bb9\uff1a<\/p>\n<pre># \u5f00\u542fSYN Cookie\u4fdd\u62a4\nnet.ipv4.tcp_syncookies = 1<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\u4f7f\u4fee\u6539\u751f\u6548\uff1a<\/p>\n<pre>sysctl -p<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<ol>\n<li>\u914d\u7f6e\u8fde\u63a5\u9650\u5236<br \/>CentOS\u7cfb\u7edf\u8fd8\u63d0\u4f9b\u4e86\u4e00\u4e9b\u5de5\u5177\u548c\u65b9\u6cd5\u6765\u9650\u5236\u5e76\u53d1\u8fde\u63a5\u6570\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528ulimit\u547d\u4ee4\u6765\u9650\u5236\u5355\u4e2a\u7528\u6237\u7684\u5e76\u53d1\u8fde\u63a5\u6570\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/li>\n<\/ol>\n<p>\u7f16\u8f91 \/etc\/security\/limits.conf \u6587\u4ef6\uff0c\u6dfb\u52a0\u4ee5\u4e0b\u5185\u5bb9\uff1a<\/p>\n<pre># \u9650\u5236user1\u7528\u6237\u7684\u5e76\u53d1\u8fde\u63a5\u6570\u4e3a100\nuser1  hard  nofile  100<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u91cd\u65b0\u767b\u5f55user1\u7528\u6237\uff0c\u4f7f\u914d\u7f6e\u751f\u6548\u3002<\/p>\n<p>\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\u67e5\u770b\u5df2\u767b\u5f55\u7528\u6237\u7684\u5e76\u53d1\u8fde\u63a5\u6570\uff1a<\/p>\n<pre>sudo netstat -an | grep ESTABLISHED | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -nr<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<ol>\n<li>\u4f7f\u7528DoS\u9632\u62a4\u8f6f\u4ef6<br \/>\u9664\u4e86\u4ee5\u4e0a\u914d\u7f6e\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e9b\u4e13\u95e8\u7684DoS\u9632\u62a4\u8f6f\u4ef6\u6765\u589e\u5f3a\u670d\u52a1\u5668\u7684\u5b89\u5168\u6027\u3002\u4f8b\u5982\uff0cModSecurity\u662f\u4e00\u6b3e\u5f00\u6e90\u7684Web\u5e94\u7528\u7a0b\u5e8f\u9632\u706b\u5899\uff0c\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u68c0\u6d4b\u548c\u963b\u6b62DoS\u653b\u51fb\u3002\u5b89\u88c5\u5e76\u914d\u7f6eModSecurity\u53ef\u4ee5\u63d0\u4f9b\u66f4\u9ad8\u7684\u5b89\u5168\u7ea7\u522b\u3002<\/li>\n<\/ol>\n<p>\u4ee5\u4e0a\u662f\u5982\u4f55\u914d\u7f6ecentos\u7cfb\u7edf\u4ee5\u9650\u5236\u5e76\u53d1\u8fde\u63a5\u548c\u9632\u6b62\u62d2\u7edd\u670d\u52a1\u653b\u51fb\u7684\u65b9\u6cd5\u548c\u793a\u4f8b\u4ee3\u7801\u3002\u901a\u8fc7\u8fd9\u4e9b\u914d\u7f6e\uff0c\u6211\u4eec\u53ef\u4ee5\u589e\u5f3a\u670d\u52a1\u5668\u7684\u5b89\u5168\u6027\uff0c\u963b\u6b62\u6076\u610f\u653b\u51fb\u3002\u7136\u800c\uff0c\u8bf7\u6ce8\u610f\uff0c\u7f51\u7edc\u5b89\u5168\u662f\u4e00\u4e2a\u6301\u7eed\u7684\u8fdb\u7a0b\uff0c\u6211\u4eec\u8fd8\u9700\u8981\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u8fdb\u884c\u76d1\u63a7\u548c\u8c03\u6574\uff0c\u4ee5\u4fdd\u969c\u670d\u52a1\u5668\u7684\u7a33\u5b9a\u548c\u5b89\u5168\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u914d\u7f6eCentOS\u7cfb\u7edf\u4ee5\u9650\u5236\u5e76\u53d1\u8fde\u63a5\u548c\u9632\u6b62\u62d2\u7edd\u670d\u52a1\u653b\u51fb\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8FDCServers\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u914d\u7f6ecentos\u7cfb\u7edf\u4ee5\u9650\u5236\u5e76\u53d1\u8fde\u63a5\u548c\u9632\u6b62\u62d2\u7edd\u670d\u52a1\u653b\u51fb \u62d2\u7edd\u670d\u52a1\u653b\u51fb\uff08Denial of Service\uff0cDoS\uff09\u662f\u7f51\u7edc\u5b89\u5168\u4e2d\u975e\u5e38\u5e38\u89c1\u7684\u4e00\u79cd\u653b\u51fb\u65b9\u5f0f\u3002\u653b\u51fb\u8005\u901a\u8fc7\u4e0d\u65ad\u7684\u5411\u76ee\u6807\u670d\u52a1\u5668\u53d1\u9001\u8bf7\u6c42\uff0c\u5360\u7528\u5927\u91cf\u7684\u7cfb\u7edf\u8d44\u6e90\uff0c\u4f7f\u5f97\u6b63\u5e38\u7528\u6237\u65e0\u6cd5\u8bbf\u95ee\u3002\u4e3a\u4e86\u9632\u6b62\u8fd9\u79cd\u653b\u51fb\uff0c\u6211\u4eec\u53ef\u4ee5\u5728CentOS\u7cfb\u7edf\u4e0a\u8fdb\u884c\u4e00\u4e9b\u914d\u7f6e\u6765\u9650\u5236\u5e76\u53d1\u8fde\u63a5\u6570\uff0c\u4fdd\u969c\u7cfb\u7edf\u7684\u7a33\u5b9a\u548c\u5b89\u5168\u3002 \u4ee5\u4e0b\u662f\u5728CentOS\u7cfb\u7edf\u4e0a\u8fdb\u884c\u914d\u7f6e\u7684\u6b65\u9aa4\u548c\u4ee3\u7801\u793a\u4f8b\uff1a \u914d\u7f6eiptablesIptables\u662f\u4e00\u4e2a\u5728Linux\u7cfb\u7edf\u4e0a\u63a7\u5236\u7f51\u7edc\u6570\u636e\u5305\u8f6c\u53d1\u7684\u5de5\u5177\u3002\u901a\u8fc7\u914d\u7f6eiptables\u89c4\u5219\uff0c\u53ef\u4ee5\u9650\u5236\u5e76\u53d1\u8fde\u63a5\uff0c\u8fc7\u6ee4\u6076\u610f\u6d41\u91cf\u3002\u5728\u7ec8\u7aef\u4e2d\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\uff0c\u914d\u7f6eiptables\u89c4\u5219\uff1a # \u6e05\u9664\u5df2\u6709\u7684iptables\u89c4\u5219 iptables -F # \u5141\u8bb8\u5df2\u5efa\u7acb\u7684\u8fde\u63a5\u548c\u76f8\u5173\u8bf7\u6c42 iptables -A INPUT -m state &#8211;state RELATED,ESTABLISHED -j ACCEPT # \u9650\u5236\u5e76\u53d1\u8fde\u63a5\u6570\u4e3a100\uff0c\u5e76\u5141\u8bb8\u56de\u73af\u5730\u5740\u7684\u8bbf\u95ee iptables -I INPUT -p tcp &#8211;syn &#8211;dport 80 -m connlimit &#8211;connlimit-above 100 -j DROP iptables -I INPUT -i lo -j ACCEPT # \u5141\u8bb8SSH\u8fde\u63a5 iptables -I INPUT -p tcp &#8211;dport 22 -j ACCEPT [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-61754","post","type-post","status-publish","format-standard","hentry","category-os"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/61754","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=61754"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/61754\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=61754"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=61754"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=61754"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}