{"id":30682,"date":"2026-05-03T10:00:00","date_gmt":"2026-05-03T02:00:00","guid":{"rendered":"https:\/\/cn.hostease.com\/blog\/?p=30682"},"modified":"2026-05-16T23:27:23","modified_gmt":"2026-05-16T15:27:23","slug":"linux-ssh-fail2ban-hardening","status":"publish","type":"post","link":"https:\/\/cn.hostease.com\/blog\/linux\/linux-ssh-fail2ban-hardening\/","title":{"rendered":"Linux \u670d\u52a1\u5668\u5b89\u5168\u52a0\u56fa\uff1aSSH\u3001fail2ban \u4e0e\u9632\u706b\u5899\u5b9e\u6218\u914d\u7f6e"},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Linux \u670d\u52a1\u5668\u5b89\u5168\u52a0\u56fa\u5168\u666f\" src=\"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/05\/linux-server-ssh-fail2ban-cover.webp\" \/><\/p>\n<p>\u672c\u6587\u6559\u4f60\u5982\u4f55\u5728 45 \u5206\u949f\u5185\u5bf9\u4e00\u53f0\u66b4\u9732\u5728\u516c\u7f51\u7684 Ubuntu 22.04 \u670d\u52a1\u5668\u5b8c\u6210 SSH \u52a0\u56fa\u3001fail2ban \u81ea\u52a8\u5c01\u7981\u3001\u9632\u706b\u5899\u5165\u7ad9\u89c4\u5219\u4e09\u4ef6\u5957\u914d\u7f6e\uff0c\u628a\u66b4\u529b\u7834\u89e3\u3001\u626b\u63cf\u63a2\u6d4b\u3001\u672a\u6388\u6743\u7aef\u53e3\u8bbf\u95ee\u7684\u98ce\u9669\u538b\u5230\u6700\u4f4e\u3002\u8bfb\u5b8c\u672c\u6587\u4f60\u4f1a\u5f97\u5230\u4e09\u4ef6\u53ef\u76f4\u63a5\u843d\u5730\u7684\u4ea7\u51fa\uff1a\u7b2c\u4e00\uff0c\u4e00\u4efd\u53ef\u590d\u7528\u7684 sshd_config \u5173\u952e\u53c2\u6570\u8868\uff0c\u542b\u7aef\u53e3\u3001\u5bc6\u94a5\u3001\u767b\u5f55\u9650\u5236\uff1b\u7b2c\u4e8c\uff0cfail2ban \u9488\u5bf9 SSH \u4e0e nginx \u7684 jail \u914d\u7f6e\u6a21\u677f\uff0c\u5c01\u7981\u7b56\u7565\u4e0e\u767d\u540d\u5355\u7ef4\u62a4\u65b9\u6cd5\uff1b\u7b2c\u4e09\uff0c\u4e00\u7ec4\u8986\u76d6 ufw \u4e0e firewalld \u7684\u5165\u7ad9\u89c4\u5219\u6e05\u5355\uff0c\u7ed9\u56e2\u961f\u5efa\u7acb\u53ef\u590d\u7528\u7684\u5b89\u5168\u57fa\u7ebf\uff0c\u8ba9\u65b0\u673a\u5668\u5728\u4ea4\u4ed8\u65f6\u5c31\u5904\u4e8e\u6700\u5c0f\u653b\u51fb\u9762\u72b6\u6001\u3002<\/p>\n<h2>\u4e00\u3001\u4e3a\u4ec0\u4e48\u5148\u52a0\u56fa SSH \u518d\u542f\u7528 fail2ban<\/h2>\n<p>\u5982\u4f55\u5728\u4fdd\u7559\u8fdc\u7a0b\u8fd0\u7ef4\u4fbf\u5229\u7684\u540c\u65f6\uff0c\u628a\u66b4\u9732\u5728 22 \u7aef\u53e3\u7684\u66b4\u529b\u7834\u89e3\u6d41\u91cf\u964d\u5230\u51e0\u4e4e\u4e3a\u96f6\uff0c\u662f Linux \u670d\u52a1\u5668\u5b89\u5168\u52a0\u56fa\u7684\u7b2c\u4e00\u4e2a\u6838\u5fc3\u95ee\u9898\u3002\u4ec5\u9760\u6539\u5f3a\u5bc6\u7801\u5df2\u7ecf\u4e0d\u591f\uff0c\u56e0\u4e3a\u516c\u7f51\u626b\u63cf\u5668\u6bcf\u79d2\u53ef\u4ee5\u5c1d\u8bd5\u4e0a\u5343\u6b21\u7ec4\u5408\uff0c\u5355\u70b9\u5bc6\u7801\u5373\u4fbf\u590d\u6742\u4e5f\u53ef\u80fd\u5728\u76d1\u63a7\u53d1\u73b0\u524d\u88ab\u8bd5\u7a7f\u3002\u6b63\u786e\u7684\u505a\u6cd5\u662f\u5206\u5c42\u9632\u5fa1\uff1aSSH \u670d\u52a1\u672c\u8eab\u5148\u5173\u95ed\u5bc6\u7801\u767b\u5f55\u6539\u7528\u5bc6\u94a5\uff0c\u518d\u7528 fail2ban \u628a\u5f02\u5e38\u767b\u5f55\u5c1d\u8bd5\u81ea\u52a8\u5c01\u7981\uff0c\u6700\u540e\u7528\u9632\u706b\u5899\u9650\u5236\u53ea\u6709\u6307\u5b9a\u6765\u6e90 IP \u80fd\u8bbf\u95ee 22 \u7aef\u53e3\u3002<\/p>\n<p>\u5728\u505a\u8fd9\u4ef6\u4e8b\u4e4b\u524d\u5148\u8bc4\u4f30\u4e24\u4ef6\u4e8b\uff1a\u4e00\u662f\u5f53\u524d\u662f\u5426\u6709\u5b8c\u6574\u7684\u8fd0\u7ef4\u767d\u540d\u5355 IP \u6c60\uff0c\u4e8c\u662f\u662f\u5426\u6709\u8df3\u677f\u673a\u6216 VPN \u5165\u53e3\u53ef\u7528\u3002\u5982\u679c\u8fd8\u6ca1\u6709\u56fa\u5b9a\u51fa\u53e3 IP\uff0c\u5efa\u8bae\u5148\u51c6\u5907\u4e00\u53f0\u8df3\u677f\u670d\u52a1\u5668\u518d\u52a8\u624b\uff0c\u907f\u514d\u6539\u5b8c\u914d\u7f6e\u81ea\u5df1\u88ab\u9501\u5728\u5916\u9762\u3002\u4e91\u7aef\u8df3\u677f\u673a\u7684\u8d44\u6e90\u9009\u578b\u53ef\u4ee5\u53c2\u8003<a href=\"https:\/\/cn.hostease.com\/blog\/guides\/cloud-server-buying-guide\/\">\u4e91\u670d\u52a1\u5668\u9009\u8d2d\u6307\u5357<\/a>\u4e2d\u7684\u8ba1\u7b97\u4e0e\u5e26\u5bbd\uff08\u6307\u7f51\u7edc\u51fa\u53e3\u7684\u6570\u636e\u4f20\u8f93\u901f\u7387\uff0c\u5355\u4f4d Mbps\uff09\u90e8\u5206\u3002\u4e91\u670d\u52a1\u5668\uff08\u5373\u901a\u8fc7\u865a\u62df\u5316\u6280\u672f\u4ece<a href=\"https:\/\/cn.hostease.com\/dedicated-server\/\">\u7269\u7406\u670d\u52a1\u5668<\/a>\u96c6\u7fa4\u4e2d\u5207\u5206\u51fa\u6765\u7684\u5f39\u6027\u8ba1\u7b97\u8d44\u6e90\uff09\u505a\u8df3\u677f\u673a\u65f6\u914d\u7f6e\u53ef\u4ee5\u5f88\u4f4e\uff0c1 \u6838 1G \u5c31\u591f\u65e5\u5e38 SSH \u8f6c\u53d1\u3002<\/p>\n<h2>\u4e8c\u3001SSH \u670d\u52a1\u6838\u5fc3\u52a0\u56fa\u6e05\u5355<\/h2>\n<p>\u6253\u5f00 \/etc\/ssh\/sshd_config\uff0c\u6309\u4e0b\u9762\u7684\u53c2\u6570\u8868\u9010\u9879\u8c03\u6574\u3002\u6838\u5fc3\u914d\u7f6e\u8981\u70b9\uff1a<\/p>\n<ul>\n<li>Port 22022\uff1a\u628a\u9ed8\u8ba4 22 \u7aef\u53e3\u6539\u6210\u4e94\u4f4d\u975e\u6807\u51c6\u7aef\u53e3\uff0c\u80fd\u6321\u4f4f 95% \u7684\u968f\u673a\u626b\u63cf<\/li>\n<li>PermitRootLogin no\uff1a\u7981\u6b62 root \u76f4\u63a5\u767b\u5f55\uff0c\u6539\u7528\u666e\u901a\u7528\u6237\u52a0 sudo<\/li>\n<li>PasswordAuthentication no\uff1a\u5173\u95ed\u5bc6\u7801\u767b\u5f55\uff0c\u5f3a\u5236\u5bc6\u94a5<\/li>\n<li>PubkeyAuthentication yes\uff1a\u5f00\u542f\u516c\u94a5\u8ba4\u8bc1<\/li>\n<li>AllowUsers ops deploy\uff1a\u767d\u540d\u5355\u53ef\u767b\u5f55\u7528\u6237<\/li>\n<li>MaxAuthTries 3\uff1a\u5355\u6b21\u8fde\u63a5\u6700\u5927\u5c1d\u8bd5\u6b21\u6570<\/li>\n<li>ClientAliveInterval 300\uff1a\u95f2\u7f6e 5 \u5206\u949f\u53d1\u5fc3\u8df3<\/li>\n<\/ul>\n<p>\u6539\u5b8c\u6267\u884c sshd -t \u9a8c\u8bc1\u914d\u7f6e\u8bed\u6cd5\uff0c\u518d systemctl reload sshd \u751f\u6548\u3002\u52a1\u5fc5\u4fdd\u7559\u5f53\u524d ssh \u4f1a\u8bdd\u518d\u5f00\u4e00\u4e2a\u65b0\u4f1a\u8bdd\u9a8c\u8bc1\u5bc6\u94a5\u767b\u5f55\u6b63\u5e38\u540e\u518d\u9000\u51fa\u539f\u4f1a\u8bdd\uff0c\u907f\u514d\u6539\u574f\u88ab\u9501\u3002\u5b9e\u9645\u64cd\u4f5c\u4e2d\u8fd8\u8981\u89c4\u5212\u597d\u5bc6\u94a5\u7684\u5206\u53d1\u4e0e\u8f6e\u6362\uff1a\u5efa\u8bae\u7ed9\u6bcf\u4e2a\u56e2\u961f\u6210\u5458\u5355\u72ec\u7b7e\u53d1\u5bc6\u94a5\uff0c\u7edf\u4e00\u901a\u8fc7\u914d\u7f6e\u7ba1\u7406\u5de5\u5177\u4e0b\u53d1\u5230 authorized_keys\uff0c\u79bb\u804c\u65f6\u53ea\u9700\u8981\u4ece\u914d\u7f6e\u5e93\u4e2d\u5220\u9664\u5bf9\u5e94\u6761\u76ee\u5373\u53ef\u5168\u673a\u56de\u6536\u6743\u9650\u3002\u5728\u591a\u4eba\u534f\u4f5c\u73af\u5883\u91cc\uff0c\u53ef\u4ee5\u8003\u8651\u5f15\u5165 SSH \u8bc1\u4e66\u673a\u5236\uff0c\u7531\u4e2d\u592e CA \u7b7e\u53d1\u77ed\u671f\u8bc1\u4e66\u66ff\u4ee3\u9759\u6001\u516c\u94a5\uff0c\u8ba9\u6743\u9650\u968f\u65f6\u95f4\u81ea\u52a8\u8fc7\u671f\u3002\u5982\u679c\u4f60\u7684\u670d\u52a1\u5668\u662f <a href=\"https:\/\/cn.hostease.com\/vps\/\">VPS<\/a>\uff08Virtual Private Server\uff0c<a href=\"https:\/\/cn.hostease.com\/vps\/\">\u865a\u62df\u4e13\u7528\u670d\u52a1\u5668<\/a>\uff0c\u901a\u8fc7\u865a\u62df\u5316\u5212\u5206\u7684\u72ec\u7acb\u5b9e\u4f8b\uff09\uff0c\u8fd8\u8981\u786e\u8ba4\u63a7\u5236\u53f0\u6551\u63f4\u5165\u53e3\u53ef\u7528\u3002\u9700\u8981\u8fdc\u7a0b\u6279\u91cf\u540c\u6b65\u5bc6\u94a5\u7684\u6d41\u7a0b\u53ef\u4ee5\u53c2\u8003<a href=\"https:\/\/cn.hostease.com\/blog\/tutorials\/us-vps-deployment-tutorial-guide\/\">\u7f8e\u56fd VPS \u90e8\u7f72\u6559\u7a0b<\/a>\u91cc\u7684 SSH \u4e0e\u516c\u94a5\u5206\u53d1\u90e8\u5206\u3002<\/p>\n<h2>\u4e09\u3001fail2ban \u81ea\u52a8\u5c01\u7981\u914d\u7f6e<\/h2>\n<p>apt install fail2ban \u540e\u5728 \/etc\/fail2ban\/jail.local \u5199\u5165\u4e0b\u9762\u7684\u7b56\u7565\u3002\u6838\u5fc3\u5b57\u6bb5\u8bf4\u660e\uff1a<\/p>\n<ul>\n<li>bantime = 3600\uff1a\u5355\u6b21\u5c01\u7981 1 \u5c0f\u65f6<\/li>\n<li>findtime = 600\uff1a10 \u5206\u949f\u7a97\u53e3<\/li>\n<li>maxretry = 5\uff1a\u8d85\u8fc7 5 \u6b21\u5931\u8d25\u5373\u5c01<\/li>\n<li>backend = systemd\uff1a\u4ece systemd journal \u8bfb\u65e5\u5fd7<\/li>\n<li>ignoreip = \u4f60\u7684\u8fd0\u7ef4\u51fa\u53e3 IP\uff1a\u767d\u540d\u5355\u9632\u8bef\u4f24<\/li>\n<\/ul>\n<p>\u6700\u5e38\u7528\u7684\u4e24\u4e2a jail \u662f sshd \u4e0e nginx-http-auth\u3002sshd jail \u76d1\u63a7 SSH \u767b\u5f55\u5931\u8d25\uff0cnginx-http-auth jail \u76d1\u63a7\u7f51\u7ad9\u540e\u53f0\u7684 401 \u9519\u8bef\u3002fail2ban-client status sshd \u53ef\u4ee5\u67e5\u770b\u5f53\u524d\u5c01\u7981\u5217\u8868\uff0cfail2ban-client unban 1.2.3.4 \u7528\u6765\u624b\u52a8\u89e3\u5c01\u3002\u65e5\u5fd7\u8def\u5f84\u4f1a\u56e0\u53d1\u884c\u7248\u4e0d\u540c\u800c\u53d8\u5316\uff0csystemd \u7cfb\u5217\u76f4\u63a5\u8bfb journal\uff0c\u8001\u7248\u672c\u8bfb \/var\/log\/auth.log\uff0c\u914d\u7f6e\u9519\u4e86\u4f1a\u51fa\u73b0&#8221;\u5c01\u4e0d\u5230\u4efb\u4f55\u4eba&#8221;\u6216&#8221;\u81ea\u5c01\u81ea\u5df1&#8221;\u4e24\u79cd\u5178\u578b\u6545\u969c\u3002\u8fd8\u8981\u4e3a fail2ban \u914d\u7f6e\u90ae\u4ef6\u544a\u8b66\uff0c\u628a\u6bcf\u6b21\u5c01\u7981\u4e8b\u4ef6\u63a8\u9001\u5230\u8fd0\u7ef4\u7fa4\uff0c\u65b0\u673a\u5668\u4e0a\u7ebf\u7b2c\u4e00\u5929\u5f80\u5f80\u4f1a\u89e6\u53d1\u6570\u5341\u6b21\u5c01\u7981\uff0c\u8fd9\u80fd\u5e2e\u52a9\u56e2\u961f\u5feb\u901f\u8bc6\u522b\u6b63\u5728\u88ab\u9488\u5bf9\u7684\u626b\u63cf\u6e90 IP \u6bb5\u3002\u5982\u679c\u4e1a\u52a1\u5bf9\u8bef\u5c01\u5bb9\u5fcd\u5ea6\u4f4e\uff0c\u53ef\u4ee5\u628a bantime \u8c03\u77ed\u5230 600 \u79d2\u5e76\u52a0\u5927 maxretry \u9608\u503c\u3002<\/p>\n<h2>\u56db\u3001\u9632\u706b\u5899\u5165\u7ad9\u89c4\u5219\u4e0e\u4e0b\u4e00\u6b65\u5efa\u8bae<\/h2>\n<p>ufw \u5728 Ubuntu\/Debian \u4e0a\u66f4\u6613\u7528\uff0cfirewalld \u5728 RHEL\/CentOS\/Rocky \u4e0a\u66f4\u539f\u751f\u3002\u65e0\u8bba\u54ea\u79cd\u5de5\u5177\uff0c\u57fa\u672c\u539f\u5219\u90fd\u662f\u9ed8\u8ba4\u62d2\u7edd\u3001\u6309\u9700\u653e\u884c\uff1a<\/p>\n<ul>\n<li>ufw default deny incoming\uff1a\u9ed8\u8ba4\u62d2\u7edd\u6240\u6709\u5165\u7ad9<\/li>\n<li>ufw default allow outgoing\uff1a\u9ed8\u8ba4\u5141\u8bb8\u6240\u6709\u51fa\u7ad9<\/li>\n<li>ufw allow from <ops_ip> to any port 22022 proto tcp\uff1a\u767d\u540d\u5355 IP \u624d\u80fd\u8bbf\u95ee SSH<\/li>\n<li>ufw allow 80,443\/tcp\uff1a\u653e\u884c HTTP \u4e0e HTTPS<\/li>\n<li>ufw limit 22022\/tcp\uff1a\u5bf9 SSH \u7aef\u53e3\u505a\u8fde\u63a5\u9650\u901f<\/li>\n<li>ufw enable\uff1a\u5f00\u542f\u9632\u706b\u5899<\/li>\n<\/ul>\n<p>\u9632\u706b\u5899\u89c4\u5219\u6539\u5b8c\u7528 ufw status numbered \u68c0\u67e5\u987a\u5e8f\uff0c\u786e\u4fdd\u62d2\u7edd\u89c4\u5219\u6ca1\u6709\u5728\u653e\u884c\u89c4\u5219\u524d\u9762\u3002\u751f\u4ea7\u670d\u52a1\u5668\u8fd8\u5e94\u8be5\u52a0\u4e0a\u65e5\u5fd7\u89c4\u5219\uff0c\u628a\u88ab\u62d2\u7edd\u7684\u8fde\u63a5\u5c1d\u8bd5\u843d\u76d8\u4ee5\u4fbf\u5ba1\u8ba1\u3002\u5982\u679c\u540c\u65f6\u5728\u8dd1 nginx \u53cd\u5411\u4ee3\u7406\u4e0e WordPress\uff0c\u5efa\u8bae\u7ed3\u5408<a href=\"https:\/\/cn.hostease.com\/blog\/guides\/wordpress-hk-hosting-guide\/\">WordPress \u9999\u6e2f\u4e3b\u673a\u8d2d\u4e70\u6307\u5357<\/a>\u7684\u4e3b\u673a\u9009\u578b\u4e0e<a href=\"https:\/\/cn.hostease.com\/blog\/wordpress\/wordpress-w3-total-cache-tuning\/\">WordPress \u6027\u80fd\u8c03\u4f18\u5b9e\u6218<\/a>\u7684\u7f13\u5b58\u7b56\u7565\u4e00\u8d77\u505a\uff0c\u628a\u5e94\u7528\u5c42\u4e0e\u7cfb\u7edf\u5c42\u7684\u9632\u5fa1\u7edf\u4e00\u89c4\u5212\u3002\u53e6\u5916\u5efa\u8bae\u628a\u6bcf\u53f0\u673a\u5668\u7684 sshd_config\u3001jail.local\u3001ufw \u89c4\u5219\u7eb3\u5165\u7248\u672c\u7ba1\u7406\uff0c\u914d\u5408 etckeeper \u8fd9\u7c7b\u5de5\u5177\u8bb0\u5f55\u6bcf\u6b21\u53d8\u66f4\uff0c\u53d1\u751f\u95ee\u9898\u65f6\u53ef\u4ee5\u5feb\u901f\u6bd4\u5bf9\u5230\u5e95\u662f\u54ea\u6761\u6539\u52a8\u5f15\u5165\u7684\u6545\u969c\uff0c\u8ba9\u8fd0\u7ef4\u53d8\u66f4\u5177\u5907\u53ef\u5ba1\u8ba1\u6027\u3002<\/p>\n<p>\u603b\u7ed3\u6765\u8bf4\uff0cLinux \u670d\u52a1\u5668\u5b89\u5168\u52a0\u56fa\u4e0d\u662f\u5355\u70b9\u4f18\u5316\u800c\u662f\u5206\u5c42\u9632\u5fa1\uff0c\u5efa\u8bae\u4f60\u4eca\u5929\u5c31\u82b1 45 \u5206\u949f\u6309\u672c\u6587\u6e05\u5355\u505a\u4e09\u4ef6\u4e8b\uff1a\u7b2c\u4e00\uff0c\u5173\u95ed SSH \u5bc6\u7801\u767b\u5f55\u5e76\u6539\u7528\u5bc6\u94a5\uff1b\u7b2c\u4e8c\uff0c\u5f00\u542f fail2ban \u76d1\u63a7 sshd jail\uff1b\u7b2c\u4e09\uff0c\u7528 ufw \u6216 firewalld 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