{"id":474,"date":"2021-02-08T00:38:03","date_gmt":"2021-02-07T21:38:03","guid":{"rendered":"https:\/\/www.cenuta.com\/blog\/?p=474"},"modified":"2021-02-08T00:38:07","modified_gmt":"2021-02-07T21:38:07","slug":"linux-sunucuda-vps-vds-ve-dedicated-ssh-port-degistirme","status":"publish","type":"post","link":"https:\/\/www.cenuta.com\/blog\/linux-sunucuda-vps-vds-ve-dedicated-ssh-port-degistirme\/","title":{"rendered":"Linux Sunucuda (VPS, VDS ve Dedicated) SSH Port De\u011fi\u015ftirme"},"content":{"rendered":"\n<p>Linux sunucuda SSH port de\u011fi\u015ftirme, sunucunun brute login denemelerinden korunabilmesi i\u00e7in gerekli olmaktad\u0131r. \u00d6zellikle <a href=\"https:\/\/www.cenuta.com\/cloud-bulut-sunucu\">Bulut Sunucu <\/a>ve <a href=\"https:\/\/www.cenuta.com\/vps-sunucu-kiralama\">VPS<\/a> \u00fcr\u00fcnlerinde yap\u0131lmas\u0131 gereken bir i\u015flemdir. <strong>Linux sunucuda SSH port de\u011fi\u015ftirme<\/strong> i\u015flemi ile varsay\u0131lan port olan 22 numaral\u0131 port de\u011fi\u015ftirilmelidir. Sunucunun hacklenmesinin \u00f6nlenebilmesi i\u00e7in SSH port dosyas\u0131 \u00fczerinden port numaras\u0131 de\u011fi\u015ftirilmeli ve ard\u0131ndan port de\u011fi\u015fikli\u011fi aktif edilmelidir. Sistem yeniden ba\u015flat\u0131ld\u0131\u011f\u0131nda, yeni port numaras\u0131 ile sunucu daha g\u00fcvenli hale getirilmi\u015f olmaktad\u0131r.<\/p>\n\n\n\n<p><strong>Linux Sunucuda SSH Port Neden De\u011fi\u015ftirilmelidir?<\/strong><\/p>\n\n\n\n<p><strong>Linux\u2019ta SSH portunu de\u011fi\u015ftirmenin gereklili\u011fi<\/strong>, sunucunun g\u00fcvenli\u011fi a\u00e7\u0131s\u0131ndan \u00f6nemlidir. Kurulum tamamland\u0131ktan sonra SSH portu varsay\u0131lan port 22 olarak ayarlanm\u0131\u015f olmaktad\u0131r. Dolay\u0131s\u0131 ile sonras\u0131nda sunucunun hacklenmemesi i\u00e7in sunucunun portunun de\u011fi\u015ftirilmesi gerekmektedir. Varsay\u0131lan port numaras\u0131n\u0131n 22 oldu\u011funu b\u00fct\u00fcn bilgisayar korsanlar\u0131 bilmektedir. SSH\u2019nin hangi port ya da portlar ile ileti\u015fim kurdu\u011funun bilgisayar korsanlar\u0131 taraf\u0131ndan tahmin edilememesi i\u00e7in port numaras\u0131n\u0131n de\u011fi\u015ftirilmesi gerekmektedir.<\/p>\n\n\n\n<p><strong>Linux Sunucuda SSH Port De\u011fi\u015ftirme \u0130\u00e7in \u0130htiya\u00e7 Duyulanlar Nelerdir?<\/strong><\/p>\n\n\n\n<p>Linux\u2019ta SSH port de\u011fi\u015fimi i\u00e7in gerek duyulanlar; VPS\u2019e SSH root eri\u015fimi ve ba\u015fka servislerin kullanmad\u0131\u011f\u0131 yeni bir port numaras\u0131d\u0131r.<\/p>\n\n\n\n<p><strong>Linux Sunucuda SSH Port De\u011fi\u015ftirme \u0130\u015flemi Nas\u0131l Yap\u0131l\u0131r?<\/strong><\/p>\n\n\n\n<p><strong>Linux\u2019ta SSH port de\u011fi\u015fimi<\/strong> i\u00e7in izlenmesi gereken ad\u0131mlar a\u015fa\u011f\u0131daki gibidir:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Sunucuya kullan\u0131c\u0131 ad\u0131 ve \u015fifre ile giri\u015f yap\u0131lmas\u0131 gerekmektedir.<\/li><li>Sunucuya giri\u015f yap\u0131ld\u0131ktan sonra \u2019\u2019nano \/etc\/ssh\/sshd_config\u2019\u2019 komutunun giri\u015fi yap\u0131lmal\u0131d\u0131r.<\/li><li>Ard\u0131ndan SSH portu dosyas\u0131 a\u00e7\u0131lmaktad\u0131r ve bu dosya i\u00e7erisinde #Port 22 olarak mevcut port g\u00f6z\u00fckmektedir. Varsay\u0131lan portun g\u00f6z\u00fckt\u00fc\u011f\u00fc b\u00f6l\u00fcm\u00fcn ba\u015f\u0131ndaki # i\u015faretinin kald\u0131r\u0131lmas\u0131 ile beraber istenen portun giri\u015fi yap\u0131lmal\u0131d\u0131r.<\/li><li>Port de\u011fi\u015ftirildikten sonra dosyan\u0131n kaydedilebilmesi i\u00e7in ctrl+X ve sonras\u0131nda Y tu\u015f kombinasyonlar\u0131n\u0131n kullan\u0131lmas\u0131 gerekmektedir.<\/li><li>Dosya kaydedildikten sonra \u00e7\u0131k\u0131\u015f yap\u0131lmal\u0131d\u0131r ve port de\u011fi\u015fikli\u011finin aktif olabilmesi i\u00e7in sshd servisine restart at\u0131lmas\u0131 gerekmektedir.<\/li><li>Restart at\u0131lmas\u0131 i\u00e7in girilmesi gereken komut ise; \u2019\u2019\/etc\/init.d\/sshd restart\u2019\u2019 olmaktad\u0131r.<\/li><\/ul>\n\n\n\n<p><strong>CentOS 7\u2019de Varsay\u0131lan SSH Port Numaras\u0131 Nas\u0131l De\u011fi\u015ftirilir?<\/strong><\/p>\n\n\n\n<p>CentOS 7\u2019de SSH ba\u011flant\u0131 noktas\u0131 numaras\u0131n\u0131 de\u011fi\u015ftirmek i\u00e7in izlenmesi gereken ad\u0131mlar a\u015fa\u011f\u0131da \u00f6rneklendirilmi\u015ftir:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>sshd_config dosyas\u0131n\u0131n yedeklenmesi i\u00e7in \u2019\u2019cp \/etc\/ssh\/sshd_config \/etc\/ssh\/sshd_config.bak\u2019\u2019 komutu girilmelidir.<\/li><li>Port numaras\u0131n\u0131n de\u011fi\u015ftirilmesi i\u00e7in \u2019\u2019nano -w \/etc\/ssh\/sshd_config\u2019\u2019 komutu girilmelidir ve port sat\u0131r\u0131 bulunmal\u0131d\u0131r. Port sat\u0131r\u0131ndaki # i\u015fareti kald\u0131r\u0131ld\u0131ktan sonra de\u011fi\u015ftirilecek olan port numaras\u0131 girilmelidir. \u00d6rne\u011fin; 22 silindikten sonra 9994 girilebilmektedir. Ctrl+X ile kaydedilip \u00e7\u0131k\u0131labilmektedir. Mac bilgisayarlarda kaydedip \u00e7\u0131kmak i\u00e7in cmd+X tu\u015flar\u0131na bas\u0131lmal\u0131d\u0131r.<\/li><li>Port eri\u015fimine izin verilmesi i\u00e7in \u2019\u2019semanage port -a -t ssh_port_t -p tcp portnumaras\u0131\u2019\u2019 komutu \u00e7al\u0131\u015ft\u0131r\u0131lmal\u0131d\u0131r.<\/li><li>Port eri\u015fimine izin verildikten sonra e\u011fer command not found hatas\u0131 al\u0131n\u0131r ise; \u2019\u2019yum -y install policycoreutils-python\u2019\u2019 komutu ile k\u00fct\u00fcphane y\u00fcklenmelidir.<\/li><li>SSH servisinin yeniden ba\u015flat\u0131labilmesi i\u00e7in son olarak \u2019\u2019systemctl restart sshd.service\u2019\u2019 komutunun giri\u015fi yap\u0131lmal\u0131d\u0131r.<\/li><\/ul>\n\n\n\n<p><strong>Linux Sunucuda SSH Port De\u011fi\u015ftirirken Problem Ya\u015famamak \u0130\u00e7in Dikkat Edilmesi Gereken Nokta Nedir?<\/strong><\/p>\n\n\n\n<p><strong>Linux\u2019ta SSH port de\u011fi\u015fiminde bilinmesi gereken \u00f6nemli nokta<\/strong>, girilecek olan yeni port numaras\u0131n\u0131n sunucudaki ba\u015fka bir servis taraf\u0131ndan kullan\u0131lm\u0131yor olmas\u0131 gerekmektedir. Ba\u015fka servisin kulland\u0131\u011f\u0131 bir port numaras\u0131 yaz\u0131l\u0131r ise; portun stabil olarak \u00e7al\u0131\u015fmamas\u0131 durumu ile kar\u015f\u0131la\u015f\u0131labilir ve dolay\u0131s\u0131 ile problem ya\u015fanabilmektedir. <strong>Linux sunucuda SSH port de\u011fi\u015ftirme<\/strong> i\u015flemini yapt\u0131ktan sonra sorun ya\u015fanmamas\u0131 i\u00e7in firewalla port eri\u015fim izni verilmesi gerekmektedir. \u0130zin verildikten sonra port de\u011fi\u015fikli\u011fi aktif edilmelidir. Port eri\u015fim izni verilmesi i\u00e7in \u00e7al\u0131\u015ft\u0131r\u0131lmas\u0131 gereken komut ise \u015f\u00f6yledir:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>iptables -A INPUT -p tcp \u2013dport -j ACCEPT<\/li><\/ul>\n\n\n\n<p>Port eri\u015fim izni verildikten ve yeni port numaras\u0131 aktif edildikten sonra sunucuya eri\u015febilmek i\u00e7in sadece de\u011fi\u015ftirilen port numaras\u0131 kullan\u0131lmaya ba\u015flanmaktad\u0131r. Sunucunun daha g\u00fcvende olmas\u0131 sa\u011flanmaktad\u0131r. VPS\u2019in daha emniyette olmas\u0131, port numaras\u0131n\u0131n de\u011fi\u015ftirilmesi ile m\u00fcmk\u00fcn olmaktad\u0131r. Varsay\u0131lan porta yap\u0131lan ba\u011flant\u0131lar\u0131n her birinin reddedilmesini ve hackerlar\u0131n SSH taray\u0131c\u0131lar\u0131ndan uzak durmas\u0131n\u0131 sa\u011flamak, varsay\u0131lan port numaras\u0131n\u0131n de\u011fi\u015ftirilip yeni port numaras\u0131na eri\u015fim verilmesi ile m\u00fcmk\u00fcn olmaktad\u0131r.<\/p>\n\n\n\n<p><strong>SSH Protokol\u00fcn\u00fcn Tan\u0131m\u0131 Nedir?<\/strong><\/p>\n\n\n\n<p>SSH; iki network cihaz\u0131 aras\u0131nda veri de\u011fi\u015fiminin g\u00fcvenlik kanal\u0131 ile olmas\u0131n\u0131 sa\u011flayan network protokol\u00fcne verilen isimdir. Kabuk hesaplar\u0131na ula\u015fmak amac\u0131 ile Linux ve Unix tabanl\u0131 sistemlerde SSH protokol\u00fcnden yararlan\u0131lmaktad\u0131r. G\u00fcvenlik yetene\u011fi olmayan network protokollerine alternatif olarak dizayn edilen bir network protokol\u00fcd\u00fcr. G\u00fcvenlik yetenekleri olmayan sistemlerde ba\u011flant\u0131 parolas\u0131 g\u00f6r\u00fclebilecek \u015fekilde \u015fifrelenmeden veriler g\u00f6nderilirken, SSH protokol\u00fcnde \u015fifreleme ve do\u011frulama algoritmalar\u0131ndan yararlan\u0131lmaktad\u0131r. SSH sunucusu, varsay\u0131lan 22 numaral\u0131 TCP portunu dinlemektedir. Uzak bilgisayara ba\u011flanarak komutlar\u0131n \u00e7al\u0131\u015ft\u0131r\u0131labilmesi i\u00e7in kullan\u0131lan bir protokold\u00fcr.<\/p>\n\n\n\n<p><strong>SSH Komutlar\u0131 ve \u0130\u015flevleri Nelerdir?<\/strong><\/p>\n\n\n\n<p><strong>SSH komutlar\u0131<\/strong> a\u015fa\u011f\u0131da verilmi\u015ftir:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>ls:<\/strong> Dizindeki her \u015feyin listelenmesini sa\u011flayan komuttur.<\/li><li><strong>ls -a:<\/strong> Gizli dosyalar\u0131n da dizindeki her \u015fey ile beraber listelenmesini sa\u011flamaktad\u0131r.<\/li><li><strong>ls -l:<\/strong> Dosyalar\u0131n hepsi, boyut ve tarihleri ile beraber listelenmektedir.<\/li><li><strong>cp:<\/strong> Dosyan\u0131n kopyalanmas\u0131n\u0131 sa\u011flayan komuttur.<\/li><li><strong>mv:<\/strong> Bir dosyan\u0131n bir ba\u015fka dizine ta\u015f\u0131nmas\u0131n\u0131 veya isminin de\u011fi\u015fmesini sa\u011flayan bir komuttur.<\/li><li><strong>mkdir:<\/strong> Yeni dizini olu\u015fturmak i\u00e7in kullan\u0131lan komuttur.<\/li><li><strong>rmdir:<\/strong> Belirtilmi\u015f olan dizinin silinmesini sa\u011flayan komuttur.<\/li><li><strong>rm:<\/strong> Dosyay\u0131 silmek i\u00e7in kullan\u0131lmaktad\u0131r.<\/li><li><strong>rm -rf:<\/strong> Dizinin silinmesine yarayan komuttur.<\/li><li><strong>cd:<\/strong> Belirtilen dizine ge\u00e7ilebilmesini sa\u011flayan bir komuttur.<\/li><li><strong>cd ..: <\/strong>Bir \u00fcst dizine ge\u00e7ilmesine yaramaktad\u0131r.<\/li><li><strong>cd ~:<\/strong> En \u00fcst dizine ge\u00e7ilmesini sa\u011flamaktad\u0131r.<\/li><li><strong>pwd:<\/strong> Mevcut dizinin g\u00f6r\u00fcnt\u00fclenmesini sa\u011flamaktad\u0131r.<\/li><li><strong>nano:<\/strong> Belirtilen dosyan\u0131n text edit\u00f6r ile d\u00fczenlenmesi i\u00e7in kullan\u0131lan bir komuttur.<\/li><li><strong>df:<\/strong> Harddisk istatistiklerinin g\u00f6r\u00fcnt\u00fclenmesi i\u00e7in kullan\u0131lmaktad\u0131r.<\/li><li><strong>uname:<\/strong> \u0130\u015fletim sisteminin durumunun g\u00f6z\u00fckebilmesi i\u00e7in yararlan\u0131lan bir komuttur.<\/li><li><strong>ps -x:<\/strong> \u00c7al\u0131\u015ft\u0131r\u0131lan i\u015flemler bu komut ile g\u00f6r\u00fclebilmektedir.<\/li><li><strong>ps -a:<\/strong> Sunucu kapsam\u0131nda \u00e7al\u0131\u015ft\u0131r\u0131lan her bir i\u015flemin listelenmesini sa\u011flayan komuttur.<\/li><li><strong>ps -ux:<\/strong> CPU\/RAM kullan\u0131m\u0131 ile \u00e7al\u0131\u015ft\u0131r\u0131lan i\u015flemlerin g\u00f6r\u00fclebilmesi bu komut ile m\u00fcmk\u00fcn olmaktad\u0131r.<\/li><li><strong>kill:<\/strong> Pid numaras\u0131 verilen i\u015flemin durdurulabilmesini sa\u011flayan bir komuttur.<\/li><li><strong>kill -9:<\/strong> Pid numaras\u0131 al\u0131nan eggdrop i\u015fleminin durdurulmas\u0131 bu komut ile sa\u011flanmaktad\u0131r.<\/li><li><strong>killall:<\/strong> Belirtilmi\u015f olan program t\u00fcr\u00fc kapsam\u0131ndaki i\u015flemlerin durdurulmas\u0131n\u0131 sa\u011flamaktad\u0131r.<\/li><li><strong>passwd:<\/strong> Hesaba giri\u015f yaparken kullan\u0131lan \u015fifrenin de\u011fi\u015ftirilmesini sa\u011flayacak komuttur.<\/li><\/ul>\n\n\n\n<p><strong>SSH Kullan\u0131m\u0131 Nas\u0131ld\u0131r ve Port Numaras\u0131 Giri\u015fi Nas\u0131l Yap\u0131l\u0131r?<\/strong><\/p>\n\n\n\n<p>SSH kullanmak i\u00e7in Linux\u2019ta openssh kurulu olmaktad\u0131r. Ancak Windows i\u015fletim sistemi i\u00e7in ekstradan kurulmas\u0131 gerekmektedir. Paket y\u00f6neticisi ile openssh kurulabilmektedir. SSH i\u00e7in Linux sunucular\u0131na ba\u011flanabilmek, putty yaz\u0131l\u0131m\u0131 ile m\u00fcmk\u00fcn olmaktad\u0131r. VDS ya da Dedicated server\u0131na uzaktan ba\u011flant\u0131 ger\u00e7ekle\u015ftirilebilmesi ve y\u00f6netilmesi i\u00e7in kullan\u0131lan bir programd\u0131r. Bunun i\u00e7in \u00f6ncelikle putty yaz\u0131l\u0131m\u0131n\u0131n indirilmesi gerekmektedir. Ard\u0131ndan indirilen putty yaz\u0131l\u0131m\u0131n\u0131n configirasyon k\u0131sm\u0131 a\u00e7\u0131lmal\u0131d\u0131r. Putty, kurulumsuz olarak \u00e7al\u0131\u015fabilen bir program oldu\u011fu i\u00e7in indirildikten sonra kurulum dosyas\u0131 a\u00e7\u0131ld\u0131\u011f\u0131nda izlenmesi gereken ad\u0131mlar a\u015fa\u011f\u0131da s\u0131ralanm\u0131\u015ft\u0131r:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Host name yaz\u0131l\u0131 olan k\u0131sma IP adresi yaz\u0131lmal\u0131d\u0131r.<\/li><li>Sunucu i\u00e7in e\u011fer bir port numaras\u0131 verilmemi\u015f ise ekrandaki 22 aynen b\u0131rak\u0131lmal\u0131d\u0131r. Ancak bir port numaras\u0131 verilmi\u015f ise, ilgili kutucu\u011fa bu port numaras\u0131n\u0131n giri\u015fi yap\u0131labilmektedir.<\/li><li>Open butonuna t\u0131kland\u0131\u011f\u0131nda siyah bir ekran a\u00e7\u0131lmaktad\u0131r ve uyar\u0131 mesaj\u0131 ile kar\u015f\u0131la\u015f\u0131lmas\u0131 durumunda bu mesaj\u0131n evet olarak i\u015faretlenmesi gerekmektedir.<\/li><li>Root as yazan k\u0131sma kullan\u0131c\u0131 ad\u0131 yaz\u0131lmal\u0131d\u0131r ve password yazan k\u0131sma da \u015fifre giri\u015fi yap\u0131lmal\u0131d\u0131r. Enter butonuna t\u0131kland\u0131\u011f\u0131nda e\u011fer giri\u015fi yap\u0131lan bilgiler do\u011fru ise Access Denied mesaj\u0131 ekranda \u00e7\u0131kmaktad\u0131r.<\/li><li>Sonras\u0131nda SSH komutlar\u0131 i\u00e7erisinde istenen komut girilerek i\u015flem yap\u0131labilmektedir ve <strong>Linux sunucuda SSH port de\u011fi\u015ftirme<\/strong> i\u00e7in de komut giri\u015fi yap\u0131labilmektedir.<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Linux sunucuda SSH port de\u011fi\u015ftirme, sunucunun brute login denemelerinden korunabilmesi<a href=\"https:\/\/www.cenuta.com\/blog\/linux-sunucuda-vps-vds-ve-dedicated-ssh-port-degistirme\/\">&#8230;<\/a><\/p>\n","protected":false},"author":1,"featured_media":495,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-474","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sunucu"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.1 - 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