{"id":3548,"date":"2017-05-31T11:13:29","date_gmt":"2017-05-31T08:13:29","guid":{"rendered":"https:\/\/www.limonhost.net\/makaleler\/?p=3548"},"modified":"2021-02-12T23:02:35","modified_gmt":"2021-02-12T20:02:35","slug":"centos-7-ssh-port-degisimi","status":"publish","type":"post","link":"https:\/\/www.limonhost.net\/makaleler\/nasil-yaparim\/centos-7-ssh-port-degisimi\/","title":{"rendered":"CentOS 7 SSH Port De\u011fi\u015fimi"},"content":{"rendered":"<p>CentOS 7 SSH port de\u011fi\u015fimi sunucu g\u00fcvenli\u011fi i\u00e7in olduk\u00e7a \u00f6nemlidir. SSH \u00fczerinden sunucumuza ba\u011flan\u0131rken varsay\u0131lan olarak 22. porttan ba\u011flan\u0131r\u0131z ve d\u00fcnya \u00fczerinde siber sald\u0131r\u0131lar g\u00fcn ge\u00e7tik\u00e7e artt\u0131\u011f\u0131 i\u00e7in sunucunun IP adresini sizden ba\u015fka bilen olmasa bile bot olarak kullan\u0131lan bilgisayarlar taraf\u0131ndan SSH eri\u015fimi brute force olarak d\u00fczenli aral\u0131klarla sald\u0131r\u0131ya maruz kalmaktad\u0131r.<!--more--><\/p>\n<h2>Gereksinimler<\/h2>\n<ul>\n<li>CentOS 7 Sunucu<\/li>\n<li>SSH Eri\u015fimi ya da Console Eri\u015fimi<\/li>\n<li>root Yetkisi<\/li>\n<\/ul>\n<h2>Ba\u015flamadan \u00d6nce<\/h2>\n<p>SSH port de\u011fi\u015ftirme i\u015fleminde bazen kullan\u0131c\u0131lar hata yaparak SSH eri\u015fimini tamamen eri\u015filmez hale getirebiliyor. Bu gibi durumlarda mutlaka console eri\u015fiminiz oldu\u011fundan emin olun<\/p>\n<h2>1. Ad\u0131m: SELinux Kontrol\u00fc<\/h2>\n<p>SELinux, CentOS, RHEL gibi sunucularda g\u00fcvenlik i\u00e7in ilk kurulumda aktif olarak gelir. Sunucunun rol\u00fcne g\u00f6re bu servisi kapatabilir ya da kendinize g\u00f6re konfig\u00fcre edebilirsiniz. SSH port de\u011fi\u015fimi \u00f6ncesinde SELinux&#8217;u ya tamamen devred\u0131\u015f\u0131 b\u0131rakman\u0131z ya da yeni SSH port bilginizi SELinux&#8217;a eklemeniz gerekir. SELinux durumunu kontrol etmek i\u00e7in a\u015fa\u011f\u0131daki komutu kullan\u0131yoruz.<\/p>\n<pre class=\"lang:default decode:true\"># sestatus<\/pre>\n<p>\u0130lk kurulum sonras\u0131 a\u015fa\u011f\u0131daki gibi bir \u00e7\u0131kt\u0131 elde etmemiz gerekiyor.<\/p>\n<pre class=\"lang:default decode:true\">[root@localhost ~]# sestatus\nSELinux status:                 enabled\nSELinuxfs mount:                \/selinux\nCurrent mode:                   enforcing\nMode from config file:          enforcing\nPolicy version:                 21\nPolicy from config file:        targeted<\/pre>\n<h2>&nbsp;<\/h2>\n<p>SELinux servisini tamamen devred\u0131\u015f\u0131 b\u0131rakmak i\u00e7in ise a\u015fa\u011f\u0131daki komutu \u00e7al\u0131\u015ft\u0131rmam\u0131z gerekli.<\/p>\n<pre class=\"lang:default decode:true\"># setenforce 0<\/pre>\n<p>SELinux servisi, sunucumuz a\u00e7\u0131l\u0131rken kernel y\u00fcklenme s\u0131ras\u0131nda aktif oldu\u011fu i\u00e7in sunucumuza bu de\u011fi\u015fiklik sonras\u0131 yeniden ba\u015flatmal\u0131y\u0131z. Bunun i\u00e7in ise reboot komutu yeterli olacakt\u0131r.<\/p>\n<pre class=\"lang:default decode:true \"># reboot<\/pre>\n<p>&nbsp;<\/p>\n<h2>2. Ad\u0131m: SELinux&#8217;a SSH Port Bilgisi Eklemek<\/h2>\n<p>Bu makalede, 22. port yerine 22222. portu kullanaca\u011f\u0131mdan bundan sonraki k\u0131s\u0131mlar\u0131 kendinize g\u00f6re d\u00fczenleyebilirsiniz. SELinux&#8217;a yeni port numaras\u0131n\u0131 eklemek i\u00e7in \u015fu komutu \u00e7al\u0131\u015ft\u0131rabilirsiniz.<\/p>\n<pre class=\"lang:default decode:true\"># semanage port -a -t ssh_port_t -p tcp 22222<\/pre>\n<p>&nbsp;<\/p>\n<h2>3. Ad\u0131m: SSH Konfig\u00fcrasyonu<\/h2>\n<p>Sunucumuzdaki SELinux servisini kapatt\u0131ysak ya da yeni SSH port bilgisini SELinux&#8217;a eklediysek art\u0131k SSH servisini konfig\u00fcre etmeye haz\u0131r\u0131z demektir. Bunun i\u00e7in vi edit\u00f6r\u00fcn\u00fc kullanaca\u011f\u0131m. \u0130lgili komut a\u015fa\u011f\u0131daki gibidir.<\/p>\n<pre class=\"lang:default decode:true \"># vi \/etc\/ssh\/sshd_config<\/pre>\n<p>Bu komutu \u00e7al\u0131\u015ft\u0131rd\u0131ktan sonra kar\u015f\u0131m\u0131z a\u015fa\u011f\u0131daki ile ayn\u0131 ya da benzer bilgiler gelmesi gerekiyor.<\/p>\n<pre class=\"lang:default decode:true \">#       $OpenBSD: sshd_config,v 1.93 2014\/01\/10 05:59:19 djm Exp $\n\n# This is the sshd server system-wide configuration file.  See\n# sshd_config(5) for more information.\n\n# This sshd was compiled with PATH=\/usr\/local\/bin:\/usr\/bin\n\n# The strategy used for options in the default sshd_config shipped with\n# OpenSSH is to specify options with their default value where\n# possible, but leave them commented.  Uncommented options override the\n# default value.\n\n# If you want to change the port on a SELinux system, you have to tell\n# SELinux about this change.\n# semanage port -a -t ssh_port_t -p tcp #PORTNUMBER\n#\n#Port 22\n#AddressFamily any\n#ListenAddress 0.0.0.0\n#ListenAddress ::<\/pre>\n<p>&nbsp;<\/p>\n<p>Benim \u015fu anda kullanm\u0131\u015f oldu\u011fum CentOS sunucusunun ssh konfig\u00fcrasyon dosyas\u0131nda 17. sat\u0131rda bulunan <strong>#Port 22<\/strong> sat\u0131r\u0131n\u0131 de\u011fi\u015ftirmem gerekiyor. Ben bu makalede 22222 port ile ssh eri\u015fimi sa\u011flayaca\u011f\u0131m i\u00e7in ilgili sat\u0131r\u0131 a\u015fa\u011f\u0131daki gibi yapt\u0131m ve dosyay\u0131 kaydedip \u00e7\u0131kt\u0131m.<\/p>\n<pre class=\"lang:default decode:true\">Port 22222<\/pre>\n<p>&nbsp;<\/p>\n<h2>4. Ad\u0131m: SSH Servisini Yeniden Ba\u015flatmak<\/h2>\n<p>SELinux ayarlar\u0131 ve SSH konfig\u00fcrasyon dosyas\u0131n\u0131 kendimize g\u00f6re d\u00fczenledik ve s\u0131ra SSH servisini, yeni port numaras\u0131 ile yeniden ba\u015flatmaya geldi. Bunun i\u00e7in a\u015fa\u011f\u0131daki komutu kullanabiliriz.<\/p>\n<pre class=\"lang:default decode:true \"># service sshd reload<\/pre>\n<p>&nbsp;<\/p>\n<h2>5. Ad\u0131m: Port De\u011fi\u015fikli\u011fini Do\u011frulama<\/h2>\n<p>B\u00fct\u00fcn ad\u0131mlar\u0131 s\u0131ras\u0131yla takip ettik ve SSH servisimizin port numaras\u0131n\u0131 22. port yerine 22222. port olarak de\u011fi\u015ftirdik. Peki bu de\u011fi\u015fiklikten nas\u0131l emin olaca\u011f\u0131z? Cevab\u0131m\u0131z basit. Servis durumunu kontrol ederek. Servis durumu kontrol\u00fc i\u00e7in a\u015fa\u011f\u0131daki komutu \u00e7al\u0131\u015ft\u0131rabiliriz.<\/p>\n<pre class=\"lang:default decode:true \"># service sshd status<\/pre>\n<p>Servis kontrol\u00fc komutundan sonra a\u015fa\u011f\u0131daki gibi bir bilgi g\u00f6rebiliyorsan\u0131z port bilgisini ba\u015far\u0131yla de\u011fi\u015ftirdiniz demektir.<\/p>\n<pre class=\"lang:default decode:true \">Redirecting to \/bin\/systemctl status  sshd.service\n\u00e2\u2014\u008f sshd.service - OpenSSH server daemon\n   Loaded: loaded (\/usr\/lib\/systemd\/system\/sshd.service; enabled; vendor preset: enabled)\n   Active: active (running) since Mon 2017-05-29 16:38:54 +03; 1 day 18h ago\n     Docs: man:sshd(8)\n           man:sshd_config(5)\n  Process: 614713 ExecReload=\/bin\/kill -HUP $MAINPID (code=exited, status=0\/SUCCESS)\n Main PID: 106912 (sshd)\n   CGroup: \/system.slice\/sshd.service\n           \u00e2\u201d\u201d\u00e2\u201d\u20ac106912 \/usr\/sbin\/sshd -D\n\nMay 31 11:06:33 localhost.localdomain sshd[106912]: Received SIGHUP; restarting.\nMay 31 11:06:33 localhost.localdomain systemd[1]: Reloaded OpenSSH server daemon.\nMay 31 11:06:33 localhost.localdomain sshd[106912]: Server listening on 0.0.0.0 port 22222.\nMay 31 11:06:33 localhost.localdomain sshd[106912]: Server listening on :: port 22222.<\/pre>\n<p>&nbsp;<\/p>\n<p>Tebrikler! En alt sat\u0131rdan da g\u00f6r\u00fclebilece\u011fi \u00fczere, SSH servisimiz art\u0131k 22222. port \u00fczerinden \u00e7al\u0131\u015fmakta. SSH ba\u011flant\u0131n\u0131z\u0131 tamamen sonland\u0131rd\u0131ktan sonra bundan sonraki ba\u011flant\u0131lar i\u00e7in 22222. port \u00fczerinden ba\u011flant\u0131 sa\u011flayabilirsiniz.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CentOS 7 SSH port de\u011fi\u015fimi sunucu g\u00fcvenli\u011fi i\u00e7in olduk\u00e7a \u00f6nemlidir. SSH \u00fczerinden sunucumuza ba\u011flan\u0131rken varsay\u0131lan olarak 22. porttan ba\u011flan\u0131r\u0131z ve d\u00fcnya \u00fczerinde siber sald\u0131r\u0131lar g\u00fcn ge\u00e7tik\u00e7e artt\u0131\u011f\u0131 i\u00e7in sunucunun IP adresini sizden ba\u015fka bilen olmasa bile bot olarak kullan\u0131lan bilgisayarlar taraf\u0131ndan SSH eri\u015fimi brute force olarak d\u00fczenli aral\u0131klarla sald\u0131r\u0131ya maruz kalmaktad\u0131r.<\/p>\n","protected":false},"author":7,"featured_media":3683,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.11 (Yoast SEO v21.8.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>CentOS 7 SSH Port De\u011fi\u015fimi | LimonHost<\/title>\n<meta name=\"description\" content=\"CentOS 7 SSH Port De\u011fi\u015fimi\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.limonhost.net\/makaleler\/nasil-yaparim\/centos-7-ssh-port-degisimi\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CentOS 7 SSH Port De\u011fi\u015fimi\" \/>\n<meta property=\"og:description\" content=\"CentOS 7 SSH port de\u011fi\u015fimi sunucu g\u00fcvenli\u011fi i\u00e7in olduk\u00e7a \u00f6nemlidir. SSH \u00fczerinden sunucumuza ba\u011flan\u0131rken varsay\u0131lan olarak 22. porttan ba\u011flan\u0131r\u0131z ve d\u00fcnya \u00fczerinde siber sald\u0131r\u0131lar g\u00fcn ge\u00e7tik\u00e7e artt\u0131\u011f\u0131 i\u00e7in sunucunun IP adresini sizden ba\u015fka bilen olmasa bile bot olarak kullan\u0131lan bilgisayarlar taraf\u0131ndan SSH eri\u015fimi brute force olarak d\u00fczenli aral\u0131klarla sald\u0131r\u0131ya maruz kalmaktad\u0131r.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.limonhost.net\/makaleler\/nasil-yaparim\/centos-7-ssh-port-degisimi\/\" \/>\n<meta property=\"og:site_name\" content=\"Makaleler | LIMONHOST\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/tr-tr.facebook.com\/limonhosting\/\" \/>\n<meta property=\"article:published_time\" content=\"2017-05-31T08:13:29+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-02-12T20:02:35+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cdn2.limonhost.net\/wp-content\/uploads\/2017\/05\/ssh_port_degisimi.png\" \/>\n\t<meta property=\"og:image:width\" content=\"750\" \/>\n\t<meta property=\"og:image:height\" content=\"300\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Ercan Ermis\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"CentOS 7 SSH Port De\u011fi\u015fimi\" \/>\n<meta name=\"twitter:description\" content=\"CentOS 7 SSH port de\u011fi\u015fimi sunucu g\u00fcvenli\u011fi i\u00e7in olduk\u00e7a \u00f6nemlidir. SSH \u00fczerinden sunucumuza ba\u011flan\u0131rken varsay\u0131lan olarak 22. porttan ba\u011flan\u0131r\u0131z ve d\u00fcnya \u00fczerinde siber sald\u0131r\u0131lar g\u00fcn ge\u00e7tik\u00e7e artt\u0131\u011f\u0131 i\u00e7in sunucunun IP adresini sizden ba\u015fka bilen olmasa bile bot olarak kullan\u0131lan bilgisayarlar taraf\u0131ndan SSH eri\u015fimi brute force olarak d\u00fczenli aral\u0131klarla sald\u0131r\u0131ya maruz kalmaktad\u0131r.\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/www.limonhost.net\/makaleler\/wp-content\/uploads\/2017\/05\/ssh_port_degisimi.png\" \/>\n<meta name=\"twitter:creator\" content=\"@ermisus\" \/>\n<meta name=\"twitter:site\" content=\"@limonhost\" \/>\n<meta name=\"twitter:label1\" content=\"Yazan:\" \/>\n\t<meta name=\"twitter:data1\" content=\"Ercan Ermis\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tahmini okuma s\u00fcresi\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 dakika\" \/>\n<script type=\"application\/ld+json\" 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