{"id":11978,"date":"2022-09-16T05:47:25","date_gmt":"2022-09-16T05:47:25","guid":{"rendered":"https:\/\/www.varidata.com\/kb\/how-to-improve-ssh-security-on-ubuntu-18-04"},"modified":"2022-10-10T02:04:06","modified_gmt":"2022-10-10T02:04:06","slug":"how-to-improve-ssh-security-on-ubuntu-18-04","status":"publish","type":"kb","link":"https:\/\/www.varidata.com\/zh-cn\/kb\/how-to-improve-ssh-security-on-ubuntu-18-04\/","title":{"rendered":"\u5982\u4f55\u63d0\u9ad8Ubuntu 18.04\u7cfb\u7edf\u7684SSH\u5b89\u5168\u6027\uff1f"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row gap=&#8221;25&#8243; css=&#8221;.vc_custom_1661417481090{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}&#8221; el_class=&#8221;kb-wrapper&#8221;][vc_column css=&#8221;.vc_custom_1659597638453{margin-top: 0px !important;padding-top: 0px !important;border-radius: 20px !important;}&#8221;][vc_column_text el_class=&#8221;sub-title&#8221; css=&#8221;.vc_custom_1664245986913{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;}&#8221;]\u76ee\u7684[\/vc_column_text][vc_column_text el_class=&#8221;content&#8221; css=&#8221;.vc_custom_1664157792589{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}&#8221;]SSH\u670d\u52a1\u662f\u4e91\u670d\u52a1\u5668\u7684\u4e3b\u8981\u8bbf\u95ee\u70b9\uff0c\u540c\u65f6\u4e5f\u662f\u6700\u5bb9\u6613\u53d7\u5230\u653b\u51fb\u7684\u670d\u52a1\u4e4b\u4e00\u3002\u672c\u6307\u5357\u5c06\u901a\u8fc7\u4e0d\u540c\u7684\u6280\u5de7\u548c\u6280\u672f\u5e2e\u52a9\u63d0\u9ad8\u670d\u52a1\u7684\u5b89\u5168\u6027\u3002[\/vc_column_text][vc_column_text el_class=&#8221;sub-title&#8221; css=&#8221;.vc_custom_1664157801981{margin-top: 0px !important;margin-bottom: 0px !important;}&#8221;]\u66f4\u6539\u7aef\u53e3[\/vc_column_text][vc_column_text el_class=&#8221;content&#8221; css=&#8221;.vc_custom_1664158174747{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}&#8221;]\u76d1\u542cSSH\u8fde\u63a5\u7684\u9ed8\u8ba4\u7aef\u53e3\u662f22\uff0c\u66f4\u6539\u6b64\u8bbe\u7f6e\u5c06\u5141\u8bb8\u5c06\u670d\u52a1\u4e91\u5316\uff0c\u5e76\u589e\u52a0\u8fde\u63a5\u7684\u5b89\u5168\u6027\u3002<br \/>\n\u4e3a\u4e86\u907f\u514d\u5e72\u6270\u673a\u5668\u4e0a\u7684\u5176\u4ed6\u73b0\u6709\u670d\u52a1\uff0c\u4f7f\u7528netstat\u547d\u4ee4\u68c0\u67e5\u54ea\u4e9b\u7aef\u53e3\u6b63\u5728\u4f7f\u7528\uff1a<\/p>\n<pre><code>$ netstat -n -l<\/code><\/pre>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2022\/08\/SSH-img1.jpg\" \/><br \/>\n\u901a\u8fc7\u4f20\u9012\u7ed9netstat\u7684-l\u53c2\u6570\uff0c\u5f3a\u5236\u5b83\u5904\u4e8eLISTEN\u72b6\u6001\u7684\u8fde\u63a5\u3002\u672c\u4f8b\u4e2d\u4f7f\u7528\u7684\u7aef\u53e3\u5982\u4e0b\uff1a<\/p>\n<ul class=\"kfaq-ul\">\n<li>3306 MySQL service<\/li>\n<li>22 SSH<\/li>\n<li>80 Apache2 \/ HTTP<\/li>\n<li>53 DNS<\/li>\n<\/ul>\n<p>\u82e5\u66f4\u6539\u7aef\u53e3\uff0c\u9700\u7f16\u8f91\/ etc \/ ssh \/ sshd_config\u4e2d\u7684\u914d\u7f6e\u6587\u4ef6\uff0c\u53d6\u6d88\u6ce8\u91caPort\u6307\u4ee4\uff1a<\/p>\n<pre><code>#Port 22<\/code><\/pre>\n<p>\u7136\u540e\u8bbe\u7f6e\u4e00\u4e2a\u65b0\u7684\u503c\uff08\u5efa\u8bae\u9009\u503c\u66f4\u5927\u7684\uff09\uff0c\u4ee5\u9632\u6b62\u5b83\u88ab\u4efb\u4f55\u7aef\u53e3\u81ea\u52a8\u626b\u63cf\u8f6f\u4ef6\uff08\u4f8b\u59822200\u30015574\u30011022\uff09\u622a\u83b7\uff1a<\/p>\n<pre><code>Port 5574<\/code><\/pre>\n<p>\u8981\u7533\u8bf7\u66f4\u6539\uff0c\u8bf7\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u4e0a\u4f20\uff1a<\/p>\n<pre><code>$ sudo service sshd reload<\/code><\/pre>\n<p>\u4e4b\u540e\uff0c\u518d\u901a\u8fc7\u4f7f\u7528reload\u6765\u7ea0\u6b63\u4efb\u4f55\u9519\u8bef\u5e76\u68c0\u67e5\u5bf9\u53e6\u4e00\u4e2aSSH\u5ba2\u6237\u673a\u7684\u4efb\u4f55\u65b0\u8bbf\u95ee\uff0c\u4ece\u800c\u4fdd\u6301\u8fde\u63a5\u6d3b\u52a8\u3002\u5e94\u7528\u66f4\u6539\u4e4b\u540e\uff0c\u6307\u5b9a\u65b0\u7aef\u53e3\u8fde\u63a5\u5230\u670d\u52a1\u5668\u3002\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u4ece\u547d\u4ee4\u884c\u4f7f\u7528SSH\u5ba2\u6237\u7aef\uff1a<\/p>\n<pre><code>$ ssh root@ -p 5574<\/code><\/pre>\n<p>[\/vc_column_text][vc_column_text el_class=&#8221;sub-title&#8221; css=&#8221;.vc_custom_1664157942036{margin-top: 0px !important;margin-bottom: 0px !important;}&#8221;]\u8eab\u4efd\u9a8c\u8bc1[\/vc_column_text][vc_column_text el_class=&#8221;content&#8221; css=&#8221;.vc_custom_1664158064587{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}&#8221;]\u7531\u4e8e\u5176\u5b89\u5168\u6027\uff0c\u901a\u8fc7RSA\u5bc6\u94a5\u8bbf\u95ee\u662f\u57fa\u4e8e\u5bc6\u7801\u767b\u5f55\u7684\u53e6\u4e00\u79cd\u9009\u62e9\u3002\u5728\u8fd9\u79cd\u7c7b\u578b\u7684\u8eab\u4efd\u9a8c\u8bc1\u4e2d\uff0c\u5ba2\u6237\u7aef\u751f\u6210\u4e00\u4e2a\u79c1\u94a5\u548c\u5b89\u88c5\u5728\u670d\u52a1\u5668\u673a\u5668\u4e0a\u7684\u76f8\u5173\u516c\u94a5\uff0c\u4ee5\u660e\u786e\u5730\u5bf9\u5ba2\u6237\u7aef\u8fdb\u884c\u8eab\u4efd\u9a8c\u8bc1\u3002<br \/>\n\u5982\u679c\u9700\u8981\u5b89\u88c5\u516c\u94a5\uff0c\u5ba2\u6237\u7aef\u9996\u5148\u9700\u8981\u4f7f\u7528ssh-keygen\u547d\u4ee4\u751f\u6210\u5bc6\u94a5\u5bf9\uff1a<\/p>\n<pre><code>$ ssh-keygen<\/code><\/pre>\n<pre><code>Generating public\/private rsa key pair.<\/code><\/pre>\n<pre><code>Enter file where to save the key (\/root\/.ssh\/id_rsa):<\/code><\/pre>\n<pre><code>Enter passphrase (empty for no passphrase):<\/code><\/pre>\n<pre><code>Enter same passphrase again:<\/code><\/pre>\n<pre><code>Your identification has been saved in \/root\/.ssh\/id_rsa.<\/code><\/pre>\n<pre><code>Your public key has been saved in \/root\/.ssh\/id_rsa.pub.<\/code><\/pre>\n<p>\u5728\u7ee7\u7eed\u751f\u6210\u4e4b\u524d\uff0cssh-keygen\u8981\u6c42\u4e00\u4e2a\u53ef\u7528\u4e8e\u8eab\u4efd\u9a8c\u8bc1\u7684\u53ef\u9009\u5bc6\u7801\u77ed\u8bed\u3002\u4e3a\u4e86\u65b9\u4fbf\u8bbf\u95ee\uff0c\u6211\u4eec\u5c06\u8fd9\u4e00\u90e8\u5206\u7559\u7a7a\u3002<br \/>\n\u5b8c\u6210\u540e\uff0c\u8f6f\u4ef6\u5c06\u5728\u6307\u5b9a\u7684\u6587\u4ef6\u4e2d\u4fdd\u5b58\u4e24\u4e2a\u6587\u4ef6<\/p>\n<ul>\n<li>id_rsa: \u5ba2\u6237\u7aef\u7684\u79c1\u94a5\uff0c\u4e0d\u53ef\u4e0e\u4ed6\u4eba\u5171\u4eab\u3002<\/li>\n<li>id_rsa.pub: \u53ef\u5171\u4eab\u7684\u516c\u94a5\u3002<\/li>\n<\/ul>\n<p>\u8981\u51c6\u5907\u670d\u52a1\u5668\u73af\u5883\uff0c\u5728\u7528\u6237\u6587\u4ef6\u5939\u5185\u7684.ssh\u6587\u4ef6\u5939\u4e2d\u521b\u5efa\u4e00\u4e2a\u540d\u4e3aauthorized_keys\u7684\u6587\u4ef6\uff0c\u7528\u4e8e\u767b\u5f55\uff1a<\/p>\n<pre><code>$ sudo mkdir ~\/.ssh<\/code><\/pre>\n<pre><code>$ sudo touch ~\/.ssh\/authorized_keys<\/code><\/pre>\n<pre><code>$ sudo chmod 600 ~\/.ssh\/authorized_keys<\/code><\/pre>\n<p>\u786e\u4fdd\u8be5\u6587\u4ef6\u5177\u6709\u5982\u4e0a\u6240\u793a\u7684\u6743\u9650\u3002<br \/>\n\u7136\u540e\u7ee7\u7eed\u7c98\u8d34\u5ba2\u6237\u7aef\u673a\u5668\u4e4b\u524d\u51c6\u5907\u7684\u516c\u94a5\uff1a<\/p>\n<pre><code>$ sudo nano ~\/.ssh\/authorized_keys<\/code><\/pre>\n<pre><code>ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCoTzd9RnqT0yioQG1klsLEK\/VG9myo7CQ47aRXu7hnPit6Lgw5kAjC7vzNWYLTy2oIlsrVI7R\/tvWmVNISGkWDp9U3fONbSLp+vgBKDzRUVAIqP\/AIJ2THanyZxj2b8XU\/4s2uzGoTLSR3ViX0JU6zTc+IkaBp1o3W3OolvO15E10\/VYJCKN3TkxPsSSGE3QReXnCcnIZYAnrPf9f1DPP1Lo+VUCIzZ7IzcZajAWQ53hC71mTYNHkUgIlWxpRyEhnsRfmqEfUSFbTwpNEarv7vGlK686C4xVxlVfKbqlNa3\/g2Vrae4ArVBM958JPZ6aa+7KDZfH5TDgPPtlFCIGkd root@testclient<\/code><\/pre>\n<p>\u4fdd\u5b58\u6587\u4ef6\u5e76\u91cd\u65b0\u52a0\u8f7dSSH\u670d\u52a1\uff1a<\/p>\n<pre><code>$ sudo service sshd reload<\/code><\/pre>\n<p>\u6b64\u65f6\u8bbf\u95ee\u670d\u52a1\u5668\u53ef\u80fd\u4e0d\u9700\u8981\u4efb\u4f55\u5bc6\u7801\uff1a<\/p>\n<pre><code>$ ssh root@<\/code><\/pre>\n<p>\u5982\u679c\u4e00\u5207\u6b63\u5e38\uff0c\u901a\u8fc7\u4fee\u6539\u6587\u4ef6\/ etc \/ ssh \/ sshd_config\u7981\u7528\u4ece\u670d\u52a1\u5668\u673a\u5668\u7684\u5bc6\u7801\u8bbf\u95ee\uff0c\u4f7f\u7528\u4ee5\u4e0b\u53c2\u6570\uff1a<\/p>\n<pre><code>ChallengeResponseAuthentication no\r\nPasswordAuthentication no<\/code><\/pre>\n<p>\u8bf7\u6ce8\u610f\uff0c\u60a8\u53ef\u4ee5\u6dfb\u52a0\u5176\u4ed6\u516c\u94a5\uff0c\u53ea\u9700\u5c06\u5b83\u4eec\u4fdd\u5b58\u5728\u670d\u52a1\u5668\u8ba1\u7b97\u673a\u4e2d\u4ee5~ \/ .ssh \/ authorized_keys\u4e3a\u672b\u5c3e\u7684\u6587\u4ef6\u3002[\/vc_column_text][vc_column_text el_class=&#8221;sub-title&#8221; css=&#8221;.vc_custom_1664158073066{margin-top: 0px !important;margin-bottom: 0px !important;}&#8221;]\u53ef\u7528\u65f6\u95f4\u9650\u5236[\/vc_column_text][vc_column_text el_class=&#8221;content&#8221; css=&#8221;.vc_custom_1664158162524{margin-top: 0px !important;margin-bottom: 0px !important;padding-top: 0px !important;padding-bottom: 0px !important;}&#8221;]\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684\u8bbf\u95ee\u548c\u653b\u51fb\u7684\u4e00\u79cd\u7b56\u7565\u662f\u7f29\u51cfSSH\u670d\u52a1\u7684\u53ef\u7528\u65f6\u95f4\u3002\u5982\u679c\u786e\u5b9a\u5728\u67d0\u4e9b\u65f6\u95f4\uff08\u4f8b\u5982\u665a\u4e0a11\u70b9\u5230\u7b2c\u4e8c\u5929\u65e9\u4e0a8\u70b9\uff09\u4e0d\u9700\u8981\u4f7f\u7528\u670d\u52a1\u5668\uff0c\u53ef\u4ee5\u8bbe\u7f6e\u4e00\u4e2a\u81ea\u52a8\u65f6\u95f4\u8868\u6765\u505c\u6b62\u8fde\u63a5\u7aef\u53e3\u3002<br \/>\n\u5efa\u8bae\u4f7f\u7528\u540d\u4e3aiptables\u7684\u9ed8\u8ba4\u9632\u706b\u5899\uff0c\u4f46\u662f\u8bf7\u8c28\u8bb0\uff0c\u6839\u636e\u5176\u6027\u8d28\uff0ciptables\u4e0d\u4fdd\u5b58\u8f93\u5165\u7684\u914d\u7f6e\u3002<br \/>\n\u4e3a\u52a0\u5feb\u4fdd\u5b58\u548c\u52a0\u8f7d\u914d\u7f6e\uff0c\u53ef\u4ee5\u4f7f\u7528iptables-persistent\uff0c\u5b83\u5c06\u91cd\u65b0\u52a0\u8f7d\u7cfb\u7edf\u542f\u52a8\u65f6\u4fdd\u5b58\u7684\u914d\u7f6e\u3002<br \/>\n\u7ee7\u7eed\u5b89\u88c5\uff1a<\/p>\n<pre><code>$ sudo apt-get install iptables-persistent<\/code><\/pre>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2022\/08\/sshsec-img1.jpg\" \/><br \/>\n\u5b89\u88c5\u5b8c\u6210\u540e\uff0c\u8f93\u5165\u201cchain\u201d\uff0c\u963b\u6b62SSH\u670d\u52a1\uff1a<\/p>\n<pre><code>$ sudo iptables -N chain-ssh<\/code><\/pre>\n<pre><code>$ sudo iptables -A INPUT -p tcp --dport 22 -j chain-ssh<\/code><\/pre>\n<p>\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u6240\u6709\u6307\u5411\u7aef\u53e322\u7684\u8fde\u63a5\uff08\u5982\u679c\u60a8\u7684SSH\u670d\u52a1\u4f7f\u7528\u53e6\u4e00\u4e2a\u7aef\u53e3\uff0c\u8bf7\u6839\u636e\u60a8\u7684\u81ea\u884c\u66f4\u6539\u8be5\u503c\uff09\u5c06\u901a\u8fc7\u65b0\u521b\u5efa\u7684\u201cchain- SSH\u201d\u94fe\u3002<br \/>\n\u7528\u4ee5\u4e0b\u547d\u4ee4\u4fdd\u5b58\u5f53\u524d\u914d\u7f6e\uff08\u5c06\u7531iptables-persistent\u52a0\u8f7d\uff09\uff1a<\/p>\n<pre><code>$ sudo iptables-save &gt; \/etc\/iptables\/rules.v4<\/code><\/pre>\n<p>\u7136\u540e\u901a\u8fc7\u4fee\u6539crontab\uff0c\u521b\u5efa\u4e00\u4e2a\u65f6\u95f4\u65f6\u95f4\u8868\uff0c\u7528\u4e8e\u5728\u94fe\u4e0a\u8f93\u5165\u548c\u5220\u9664\u89c4\u5219\uff0c\u5177\u4f53\u64cd\u4f5c\u5982\u4e0b\uff1a<\/p>\n<pre><code>$ sudo crontab -e<\/code><\/pre>\n<pre><code># m h  dom mon dow   command\r\n0 23   * * *   iptables -A chain-ssh -j DROP\r\n0 8    * * *   iptables -F chain-ssh<\/code><\/pre>\n<p>\u5982\u60a8\u6240\u89c1\uff0c\u901a\u8fc7\u7b2c\u4e00\u4e2a\u64cd\u4f5c\u6dfb\u52a0\u572811.00 pm\u8fde\u63a5\u7684DROP\u89c4\u5219\uff0c\u800c\u7b2c\u4e8c\u4e2a\u64cd\u4f5c\u572808.00 am\u6e05\u7a7a\u94fe\u4ee5\u6062\u590d\u670d\u52a1\u3002<br \/>\n\u4fdd\u5b58\u6587\u4ef6\u4ee5\u4f7f\u66f4\u6539\u751f\u6548\u3002<br \/>\n[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"featured_media":0,"template":"","kb_category":[465],"class_list":["post-11978","kb","type-kb","status-publish","hentry","kb_category-ubuntu-sc"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5982\u4f55\u63d0\u9ad8Ubuntu 18.04\u7cfb\u7edf\u7684SSH\u5b89\u5168\u6027\uff1f - Varidata Limited<\/title>\n<meta name=\"description\" content=\"\u76ee\u7684SSH\u670d\u52a1\u662f\u4e91\u670d\u52a1\u5668\u7684\u4e3b\u8981\u8bbf\u95ee\u70b9\uff0c\u540c\u65f6\u4e5f\u662f\u6700\u5bb9\u6613\u53d7\u5230\u653b\u51fb\u7684\u670d\u52a1\u4e4b\u4e00\u3002\u672c\u6307\u5357\u5c06\u901a\u8fc7\u4e0d\u540c\u7684\u6280\u5de7\u548c\u6280\u672f\u5e2e\u52a9\u63d0\u9ad8\u670d\u52a1\u7684\u5b89\u5168\u6027\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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