{"id":44464,"date":"2024-10-06T15:48:15","date_gmt":"2024-10-06T07:48:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/44464\/"},"modified":"2024-10-06T15:48:15","modified_gmt":"2024-10-06T07:48:15","slug":"linux-%e4%bc%ba%e6%9c%8d%e5%99%a8%e5%ae%89%e5%85%a8%e7%ad%96%e7%95%a5%e6%8a%80%e5%b7%a7%ef%bc%9a%e5%8a%a0%e5%9b%ba-tcp-ip-%e5%a0%86%e6%a3%a7","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/44464\/","title":{"rendered":"Linux \u4f3a\u670d\u5668\u5b89\u5168\u7b56\u7565\u6280\u5de7\uff1a\u52a0\u56fa TCP\/IP \u5806\u68e7"},"content":{"rendered":"<h1 id=\"linux-%e4%bc%ba%e6%9c%8d%e5%99%a8%e5%ae%89%e5%85%a8%e7%ad%96%e7%95%a5%e6%8a%80%e5%b7%a7%ef%bc%9a%e5%8a%a0%e5%9b%ba-tcp-ip-%e5%a0%86%e6%a3%a7-JmwhGWdPtl\">Linux \u4f3a\u670d\u5668\u5b89\u5168\u7b56\u7565\u6280\u5de7\uff1a\u52a0\u56fa TCP\/IP \u5806\u68e7<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u4f4d\u6642\u4ee3\uff0c\u4f3a\u670d\u5668\u7684\u5b89\u5168\u6027\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002Linux \u4f3a\u670d\u5668\u4f5c\u70ba\u8a31\u591a\u4f01\u696d\u548c\u500b\u4eba\u7db2\u7ad9\u7684\u57fa\u790e\uff0c\u5fc5\u9808\u63a1\u53d6\u6709\u6548\u7684\u5b89\u5168\u7b56\u7565\u4f86\u4fdd\u8b77\u5176 TCP\/IP \u5806\u68e7\u3002TCP\/IP \u5806\u68e7\u662f\u7db2\u7d61\u901a\u4fe1\u7684\u6838\u5fc3\uff0c\u4efb\u4f55\u6f0f\u6d1e\u90fd\u53ef\u80fd\u5c0e\u81f4\u6578\u64da\u6d29\u9732\u6216\u670d\u52d9\u4e2d\u65b7\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e00\u4e9b\u52a0\u56fa TCP\/IP \u5806\u68e7\u7684\u6280\u5de7\uff0c\u5e6b\u52a9\u7528\u6236\u63d0\u5347\u4f3a\u670d\u5668\u7684\u5b89\u5168\u6027\u3002<\/p>\n<h2 id=\"1-%e7%a6%81%e7%94%a8%e4%b8%8d%e5%bf%85%e8%a6%81%e7%9a%84%e6%9c%8d%e5%8b%99-JmwhGWdPtl\">1. \u7981\u7528\u4e0d\u5fc5\u8981\u7684\u670d\u52d9<\/h2>\n<p>\u4f3a\u670d\u5668\u4e0a\u904b\u884c\u7684\u6bcf\u4e00\u500b\u670d\u52d9\u90fd\u53ef\u80fd\u6210\u70ba\u653b\u64ca\u7684\u6f5b\u5728\u76ee\u6a19\u3002\u56e0\u6b64\uff0c\u9996\u5148\u8981\u6aa2\u67e5\u4e26\u7981\u7528\u4e0d\u5fc5\u8981\u7684\u670d\u52d9\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u67e5\u770b\u7576\u524d\u904b\u884c\u7684\u670d\u52d9\uff1a<\/p>\n<pre><code>systemctl list-units --type=service<\/code><\/pre>\n<p>\u5c0d\u65bc\u4e0d\u9700\u8981\u7684\u670d\u52d9\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u7981\u7528\uff1a<\/p>\n<pre><code>systemctl disable <\/code><\/pre>\n<h2 id=\"2-%e9%85%8d%e7%bd%ae%e9%98%b2%e7%81%ab%e7%89%86-JmwhGWdPtl\">2. \u914d\u7f6e\u9632\u706b\u7246<\/h2>\n<p>\u9632\u706b\u7246\u662f\u4fdd\u8b77\u4f3a\u670d\u5668\u7684\u91cd\u8981\u5de5\u5177\u3002\u4f7f\u7528 iptables \u6216 firewalld \u4f86\u914d\u7f6e\u9632\u706b\u7246\u898f\u5247\uff0c\u9650\u5236\u9032\u51fa\u6d41\u91cf\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528 iptables \u8a2d\u7f6e\u57fa\u672c\u9632\u706b\u7246\u898f\u5247\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT\niptables -A INPUT -p tcp --dport 22 -j ACCEPT\niptables -A INPUT -p tcp --dport 80 -j ACCEPT\niptables -A INPUT -p tcp --dport 443 -j ACCEPT\niptables -A INPUT -j DROP<\/code><\/pre>\n<p>\u9019\u4e9b\u898f\u5247\u5141\u8a31\u5df2\u5efa\u7acb\u7684\u9023\u63a5\u548c\u7279\u5b9a\u7aef\u53e3\u7684\u6d41\u91cf\uff0c\u4e26\u62d2\u7d55\u6240\u6709\u5176\u4ed6\u6d41\u91cf\u3002<\/p>\n<h2 id=\"3-%e6%9b%b4%e6%96%b0%e7%b3%bb%e7%b5%b1%e5%92%8c%e8%bb%9f%e4%bb%b6-JmwhGWdPtl\">3. \u66f4\u65b0\u7cfb\u7d71\u548c\u8edf\u4ef6<\/h2>\n<p>\u4fdd\u6301\u7cfb\u7d71\u548c\u6240\u6709\u5b89\u88dd\u7684\u8edf\u4ef6\u66f4\u65b0\u662f\u9632\u6b62\u5b89\u5168\u6f0f\u6d1e\u7684\u95dc\u9375\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u66f4\u65b0\u7cfb\u7d71\uff1a<\/p>\n<pre><code>apt update &amp;&amp; apt upgrade<\/code><\/pre>\n<p>\u5b9a\u671f\u6aa2\u67e5\u548c\u5b89\u88dd\u5b89\u5168\u66f4\u65b0\uff0c\u78ba\u4fdd\u4f3a\u670d\u5668\u4e0d\u53d7\u5df2\u77e5\u6f0f\u6d1e\u7684\u5a01\u8105\u3002<\/p>\n<h2 id=\"4-%e4%bd%bf%e7%94%a8-tcp-ip-%e5%a0%86%e6%a3%a7%e7%9a%84%e5%ae%89%e5%85%a8%e5%a2%9e%e5%bc%b7%e5%8a%9f%e8%83%bd-JmwhGWdPtl\">4. \u4f7f\u7528 TCP\/IP \u5806\u68e7\u7684\u5b89\u5168\u589e\u5f37\u529f\u80fd<\/h2>\n<p>Linux \u63d0\u4f9b\u4e86\u4e00\u4e9b TCP\/IP \u5806\u68e7\u7684\u5b89\u5168\u589e\u5f37\u529f\u80fd\uff0c\u4f8b\u5982 TCP SYN Cookies \u548c IP Spoofing \u9632\u8b77\u3002\u53ef\u4ee5\u901a\u904e\u7de8\u8f2f \/etc\/sysctl.conf \u6587\u4ef6\u4f86\u555f\u7528\u9019\u4e9b\u529f\u80fd\uff1a<\/p>\n<pre><code>net.ipv4.tcp_syncookies = 1\nnet.ipv4.conf.all.rp_filter = 1\nnet.ipv4.conf.default.rp_filter = 1<\/code><\/pre>\n<p>\u7136\u5f8c\uff0c\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u4f7f\u66f4\u6539\u751f\u6548\uff1a<\/p>\n<pre><code>sysctl -p<\/code><\/pre>\n<h2 id=\"5-%e7%9b%a3%e6%8e%a7%e7%b6%b2%e7%b5%a1%e6%b5%81%e9%87%8f-JmwhGWdPtl\">5. \u76e3\u63a7\u7db2\u7d61\u6d41\u91cf<\/h2>\n<p>\u5b9a\u671f\u76e3\u63a7\u7db2\u7d61\u6d41\u91cf\u53ef\u4ee5\u5e6b\u52a9\u53ca\u65e9\u767c\u73fe\u7570\u5e38\u884c\u70ba\u3002\u53ef\u4ee5\u4f7f\u7528\u5de5\u5177\u5982 tcpdump \u6216 Wireshark \u4f86\u6355\u7372\u548c\u5206\u6790\u7db2\u7d61\u6d41\u91cf\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528 tcpdump \u6355\u7372\u6d41\u91cf\u7684\u57fa\u672c\u547d\u4ee4\uff1a<\/p>\n<pre><code>tcpdump -i eth0<\/code><\/pre>\n<p>\u901a\u904e\u5206\u6790\u6d41\u91cf\uff0c\u53ef\u4ee5\u8b58\u5225\u6f5b\u5728\u7684\u653b\u64ca\u6216\u4e0d\u6b63\u5e38\u7684\u6d3b\u52d5\u3002<\/p>\n<h2 id=\"6-%e5%af%a6%e6%96%bd%e5%85%a5%e4%be%b5%e6%aa%a2%e6%b8%ac%e7%b3%bb%e7%b5%b1-ids-JmwhGWdPtl\">6. \u5be6\u65bd\u5165\u4fb5\u6aa2\u6e2c\u7cfb\u7d71 (IDS)<\/h2>\n<p>\u5165\u4fb5\u6aa2\u6e2c\u7cfb\u7d71\u53ef\u4ee5\u5e6b\u52a9\u6aa2\u6e2c\u548c\u97ff\u61c9\u6f5b\u5728\u7684\u5b89\u5168\u5a01\u8105\u3002\u5e38\u898b\u7684 IDS \u5de5\u5177\u5305\u62ec Snort \u548c Suricata\u3002\u9019\u4e9b\u5de5\u5177\u53ef\u4ee5\u76e3\u63a7\u7db2\u7d61\u6d41\u91cf\u4e26\u6aa2\u6e2c\u53ef\u7591\u6d3b\u52d5\uff0c\u5f9e\u800c\u63d0\u9ad8\u4f3a\u670d\u5668\u7684\u5b89\u5168\u6027\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-JmwhGWdPtl\">\u7e3d\u7d50<\/h2>\n<p>\u52a0\u56fa Linux \u4f3a\u670d\u5668\u7684 TCP\/IP \u5806\u68e7\u662f\u78ba\u4fdd\u7cfb\u7d71\u5b89\u5168\u7684\u91cd\u8981\u6b65\u9a5f\u3002\u901a\u904e\u7981\u7528\u4e0d\u5fc5\u8981\u7684\u670d\u52d9\u3001\u914d\u7f6e\u9632\u706b\u7246\u3001\u4fdd\u6301\u7cfb\u7d71\u66f4\u65b0\u3001\u4f7f\u7528\u5b89\u5168\u589e\u5f37\u529f\u80fd\u3001\u76e3\u63a7\u7db2\u7d61\u6d41\u91cf\u4ee5\u53ca\u5be6\u65bd\u5165\u4fb5\u6aa2\u6e2c\u7cfb\u7d71\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u4f3a\u670d\u5668\u7684\u5b89\u5168\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u80fd\u548c\u5b89\u5168\u6027\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u4e86\u89e3\u66f4\u591a\u95dc\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 Linux \u4f3a\u670d\u5668\u5b89\u5168\u7b56\u7565\uff0c\u5b78\u7fd2\u52a0\u56fa TCP\/IP \u5806\u68e7\u7684\u6280\u5de7\uff0c\u63d0\u5347\u7cfb\u7d71\u9632\u8b77\uff0c\u78ba\u4fdd\u6578\u64da\u5b89\u5168\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4924],"tags":[],"class_list":["post-44464","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/44464","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=44464"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/44464\/revisions"}],"predecessor-version":[{"id":44465,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/44464\/revisions\/44465"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=44464"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=44464"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=44464"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}