{"id":82,"date":"2026-02-10T10:14:00","date_gmt":"2026-02-10T10:14:00","guid":{"rendered":"https:\/\/perminet.com\/blog\/?p=82"},"modified":"2026-02-09T22:18:25","modified_gmt":"2026-02-09T22:18:25","slug":"ssh-guvenligi-nasil-saglanir","status":"publish","type":"post","link":"https:\/\/perminet.com\/blog\/ssh-guvenligi-nasil-saglanir\/","title":{"rendered":"SSH G\u00fcvenli\u011fi Nas\u0131l Sa\u011flan\u0131r?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">SSH genelde \u201c\u00e7al\u0131\u015f\u0131yor\u201d kabul edilir. Sunucu kurulur, ba\u011flant\u0131 yap\u0131l\u0131r, bir daha bak\u0131lmaz. Aylar ge\u00e7er. Kimse SSH\u2019ye dokunmaz \u00e7\u00fcnk\u00fc g\u00f6r\u00fcn\u00fcrde bir sorun yoktur. Oysa SSH, internete a\u00e7\u0131k her sunucuda <strong>en \u00e7ok yoklanan, en \u00e7ok zorlanan ve en s\u0131k istismar edilen servistir<\/strong>. \u00c7o\u011fu zaman bu fark edilmez, \u00e7\u00fcnk\u00fc sald\u0131r\u0131lar sessizdir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SSH g\u00fcvenli\u011fi genellikle bir \u015feyler ters gittikten sonra g\u00fcndeme gelir. Sunucu yava\u015flar, garip i\u015flemler ba\u015flar ya da servis sa\u011flay\u0131c\u0131 \u201csunucunuzdan anormal trafik \u00e7\u0131k\u0131yor\u201d diye uyar\u0131 g\u00f6nderir. O ana kadar herkes \u201cbizim SSH zaten g\u00fcvenli\u201d diye d\u00fc\u015f\u00fcnm\u00fc\u015ft\u00fcr.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bu yaz\u0131 tan\u0131m anlatmaz. Sahada ya\u015fanan problemlerden yola \u00e7\u0131kar. \u00c7\u00fcnk\u00fc SSH g\u00fcvenli\u011fi teorik bir konu de\u011fil, <strong>do\u011frudan pratik bir hayatta kalma meselesidir<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SSH Neden Sald\u0131r\u0131lar\u0131n \u0130lk Dura\u011f\u0131d\u0131r?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Bir sunucu internete ba\u011fland\u0131\u011f\u0131 anda otomatik taramalar ba\u015flar. Bu insanlar de\u011fil, botlard\u0131r. SSH portlar\u0131n\u0131, kullan\u0131c\u0131 adlar\u0131n\u0131 ve varsay\u0131lan ayarlar\u0131 denerler. \u00d6zellikle port 22 a\u00e7\u0131k olan sistemler, dakikalar i\u00e7inde y\u00fczlerce deneme al\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sahada en s\u0131k g\u00f6rd\u00fc\u011f\u00fcm tablo \u015fudur:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SSH portu de\u011fi\u015ftirilmemi\u015ftir<\/li>\n\n\n\n<li>Root ile giri\u015f a\u00e7\u0131kt\u0131r<\/li>\n\n\n\n<li>\u015eifreyle kimlik do\u011frulama aktiftir<\/li>\n\n\n\n<li>Fail2Ban veya benzeri bir mekanizma yoktur<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Bunlar\u0131n hi\u00e7biri \u201cileri seviye hata\u201d de\u011fildir. Ama birlikte olduklar\u0131nda, sald\u0131rgan i\u00e7in son derece elveri\u015fli bir ortam yarat\u0131rlar.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ger\u00e7ek Bir Saha Senaryosu<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Bir ajans sunucusu d\u00fc\u015f\u00fcn. Ayn\u0131 makinede birden fazla m\u00fc\u015fteri sitesi bar\u0131nd\u0131r\u0131l\u0131yor. Her \u015fey yolunda. Bir sabah ajans \u201csunucu \u00e7ok yava\u015flad\u0131\u201d diye destek ister.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130lk bak\u0131\u015fta servisler ayakta. Ama CPU s\u00fcrekli y\u00fcksek. \u0130nceleme derinle\u015ftirildi\u011finde:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Haftalard\u0131r binlerce SSH denemesi<\/li>\n\n\n\n<li>Bir noktada ba\u015far\u0131l\u0131 giri\u015f<\/li>\n\n\n\n<li>Root yetkisiyle \u00e7al\u0131\u015fan arka plan prosesleri<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Sunucu d\u00fc\u015fmemi\u015fti. Ama kontrol art\u0131k ajans\u0131n elinde de\u011fildi. En tehlikeli senaryo budur: <strong>sistem \u00e7al\u0131\u015f\u0131yor gibi g\u00f6r\u00fcn\u00fcrken ba\u015fkas\u0131 taraf\u0131ndan kullan\u0131l\u0131yor olmas\u0131<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bu olayda \u015fifre zay\u0131f de\u011fildi. Ama k\u0131r\u0131labilir bir \u015fifreydi. SSH key yoktu. Root login a\u00e7\u0131kt\u0131. Fail2Ban hi\u00e7 kurulmam\u0131\u015ft\u0131.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SSH G\u00fcvenli\u011finde \u0130lk Yap\u0131lmas\u0131 Gereken Nedir?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130lk ve en kritik ad\u0131m, varsay\u0131lan ayarlar\u0131 bozmak. Varsay\u0131lanlar sald\u0131rganlar\u0131n ezberidir. Portu, kullan\u0131c\u0131y\u0131, do\u011frulama y\u00f6ntemini otomatik olarak denerler.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ba\u015flang\u0131\u00e7 i\u00e7in olmazsa olmazlar:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Root ile SSH giri\u015fini kapatmak<\/li>\n\n\n\n<li>\u015eifreyle SSH giri\u015fini devre d\u0131\u015f\u0131 b\u0131rakmak<\/li>\n\n\n\n<li>SSH key tabanl\u0131 kimlik do\u011frulamaya ge\u00e7mek<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Bunlar yap\u0131lmadan SSH\u2019nin \u201cg\u00fcvenli\u201d oldu\u011fu s\u00f6ylenemez.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Root Login Neden Bu Kadar Risklidir?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Root, sistemin tamam\u0131d\u0131r. SSH \u00fczerinden root eri\u015fimi a\u00e7\u0131k oldu\u011funda, tek bir hesap ele ge\u00e7irilirse sunucunun tamam\u0131 gider. Dosyalar, veritabanlar\u0131, yedekler\u2026 Her \u015fey.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Do\u011fru yakla\u015f\u0131m:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Normal bir kullan\u0131c\u0131 olu\u015fturmak<\/li>\n\n\n\n<li>SSH ile bu kullan\u0131c\u0131yla ba\u011flanmak<\/li>\n\n\n\n<li>Yetki gerekti\u011finde sudo kullanmak<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Bu y\u00f6ntem eri\u015fimi s\u0131n\u0131rlar, loglar\u0131 anlaml\u0131 hale getirir ve hatal\u0131 i\u015flemlerin etkisini azalt\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u015eifre mi SSH Key mi?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Bu noktada gri alan yoktur.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Kriter<\/th><th>\u015eifre<\/th><th>SSH Key<\/th><\/tr><\/thead><tbody><tr><td>Brute force riski<\/td><td>Y\u00fcksek<\/td><td>\u00c7ok d\u00fc\u015f\u00fck<\/td><\/tr><tr><td>Otomatik sald\u0131r\u0131lar<\/td><td>Etkili<\/td><td>Etkisiz<\/td><\/tr><tr><td>Yetki kontrol\u00fc<\/td><td>Zay\u0131f<\/td><td>G\u00fc\u00e7l\u00fc<\/td><\/tr><tr><td>Profesyonel kullan\u0131m<\/td><td>Hay\u0131r<\/td><td>Evet<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">SSH key kullan\u0131m\u0131 bir kere kurulduktan sonra \u015fifreden daha pratiktir. \u015eifreyle SSH giri\u015fini tamamen kapatmak, g\u00fcvenlikte ciddi bir e\u015fik atlat\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u00c7o\u011fu Ki\u015finin Bilmedi\u011fi Teknik Bir Detay<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SSH sald\u0131r\u0131lar\u0131nda as\u0131l problem, ba\u015far\u0131s\u0131z denemeler de\u011fil <strong>ba\u011flant\u0131 kurulabilen denemelerdir<\/strong>. Bir bot SSH ba\u011flant\u0131s\u0131n\u0131 kurabiliyorsa, CPU ve RAM t\u00fcketir, loglar\u0131 \u015fi\u015firir ve sistem performans\u0131n\u0131 d\u00fc\u015f\u00fcr\u00fcr.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bu y\u00fczden sadece \u201c\u015fifrem g\u00fc\u00e7l\u00fc\u201d demek yeterli de\u011fildir. <strong>Ba\u011flant\u0131y\u0131 zorla\u015ft\u0131rmak gerekir<\/strong>. Port de\u011fi\u015ftirme burada devreye girer. G\u00fcvenli\u011fi tek ba\u015f\u0131na sa\u011flamaz ama otomatik taramalar\u0131n b\u00fcy\u00fck k\u0131sm\u0131n\u0131 keser.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SSH Portunu De\u011fi\u015ftirmek Ger\u00e7ekten \u0130\u015fe Yarar m\u0131?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Port de\u011fi\u015ftirmek mucize de\u011fildir. Ama sahada etkilidir. Port 22, t\u00fcm botlar\u0131n ilk denedi\u011fi yerdir. Farkl\u0131 bir port, hedefli sald\u0131r\u0131y\u0131 durdurmaz ama otomatik taramalar\u0131n \u00e7o\u011funu engeller.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Do\u011fru yakla\u015f\u0131m nettir: portu de\u011fi\u015ftir, ama as\u0131l g\u00fcvenli\u011fi key, firewall ve eri\u015fim k\u0131s\u0131tlar\u0131yla sa\u011fla.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Fail2Ban SSH G\u00fcvenli\u011finde Neden Kritik?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Fail2Ban, SSH g\u00fcvenli\u011finin bel kemi\u011fidir. Belirli say\u0131da ba\u015far\u0131s\u0131z denemeden sonra IP\u2019yi otomatik olarak engeller. Ancak sahada s\u0131k g\u00f6r\u00fclen bir hata vard\u0131r: Fail2Ban kurulur ve unutulur.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Yanl\u0131\u015f regex, yanl\u0131\u015f s\u00fcre veya eksik yap\u0131land\u0131rma Fail2Ban\u2019i etkisiz hale getirir. Kurulduktan sonra mutlaka test edilmelidir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">IP Bazl\u0131 SSH K\u0131s\u0131tlamas\u0131 Ne Zaman Mant\u0131kl\u0131d\u0131r?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">E\u011fer sabit IP\u2019lerden ba\u011flan\u0131yorsan, bu en temiz \u00e7\u00f6z\u00fcmlerden biridir. Sadece belirli IP\u2019lere SSH izni verilir, di\u011fer t\u00fcm d\u00fcnya kapat\u0131l\u0131r. Bu y\u00f6ntem sald\u0131r\u0131 y\u00fczeyini neredeyse s\u0131f\u0131rlar.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SSH G\u00fcvenli\u011fi Sunucu Y\u00f6netiminden Ayr\u0131 D\u00fc\u015f\u00fcn\u00fclebilir mi?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Hay\u0131r. G\u00fcncellenmeyen bir sistemde SSH ne kadar kilitli olursa olsun risk vard\u0131r. OpenSSH, kernel ve ba\u011f\u0131ml\u0131l\u0131klar\u0131n g\u00fcncel olmas\u0131 gerekir. SSH g\u00fcvenli\u011fi aktif sunucu y\u00f6netiminin bir par\u00e7as\u0131d\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00d6zellikle izole ve y\u00fcksek kaynakl\u0131 yap\u0131larda bu daha kritiktir. Nested Dedicated Sunucu gibi altyap\u0131larda hem ana fiziksel sunucunun hem de alt sanal katmanlar\u0131n SSH politikalar\u0131 do\u011fru kurgulanmal\u0131d\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bu altyap\u0131y\u0131 incelemek isteyenler i\u00e7in do\u011fal bir referans:<br><a href=\"https:\/\/perminet.com\/nested-dedicated-sunucu\">https:\/\/perminet.com\/nested-dedicated-sunucu<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SSH G\u00fcvenli\u011finde En S\u0131k Yap\u0131lan Hatalar<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Root login\u2019i a\u00e7\u0131k b\u0131rakmak<\/li>\n\n\n\n<li>\u015eifreyle SSH giri\u015fini kapatmamak<\/li>\n\n\n\n<li>Fail2Ban\u2019i kurup test etmemek<\/li>\n\n\n\n<li>Loglar\u0131 d\u00fczenli kontrol etmemek<\/li>\n\n\n\n<li>\u201cBir \u015fey olmad\u0131\u201d diyerek \u00f6nlem almamak<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">SSH G\u00fcvenli\u011fi Nas\u0131l Bir Rutine Oturtulmal\u0131?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>D\u00fczenli SSH log kontrol\u00fc<\/li>\n\n\n\n<li>G\u00fcncelleme sonras\u0131 ba\u011flant\u0131 testleri<\/li>\n\n\n\n<li>Kullan\u0131c\u0131 ve SSH key denetimi<\/li>\n\n\n\n<li>Gereksiz eri\u015fimlerin silinmesi<\/li>\n\n\n\n<li>Firewall ve Fail2Ban durum kontrolleri<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">FAQ \u2013 SSH G\u00fcvenli\u011fi Hakk\u0131nda S\u0131k Sorulan Sorular<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SSH portunu de\u011fi\u015ftirmek tek ba\u015f\u0131na yeterli de\u011fildir.<br>SSH key kullan\u0131m\u0131 zor de\u011fildir, al\u0131\u015f\u0131nca daha pratiktir.<br>Fail2Ban internete a\u00e7\u0131k sunucular i\u00e7in gereklidir.<br>SSH g\u00fcvenli\u011fi dolayl\u0131 olarak SEO\u2019yu etkiler \u00e7\u00fcnk\u00fc hacklenen veya yava\u015flayan sunucular s\u0131ralama kayb\u0131 ya\u015far.<br>K\u00fc\u00e7\u00fck projeler de sald\u0131r\u0131ya u\u011frar, botlar proje boyutuna bakmaz.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>SSH genelde \u201c\u00e7al\u0131\u015f\u0131yor\u201d kabul edilir. Sunucu kurulur, ba\u011flant\u0131 yap\u0131l\u0131r, bir daha bak\u0131lmaz. Aylar ge\u00e7er. Kimse SSH\u2019ye dokunmaz \u00e7\u00fcnk\u00fc g\u00f6r\u00fcn\u00fcrde bir sorun yoktur. Oysa SSH, internete a\u00e7\u0131k her sunucuda en \u00e7ok&#8230;<\/p>\n","protected":false},"author":2,"featured_media":83,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[37,36,6,35,2],"class_list":["post-82","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-genel","tag-guvenli-sunucu","tag-guvenlik","tag-nested","tag-shh","tag-vds"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SSH G\u00fcvenli\u011fi Nas\u0131l Sa\u011flan\u0131r? - Perminet<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/perminet.com\/blog\/ssh-guvenligi-nasil-saglanir\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SSH G\u00fcvenli\u011fi Nas\u0131l Sa\u011flan\u0131r? - Perminet\" \/>\n<meta property=\"og:description\" content=\"SSH genelde \u201c\u00e7al\u0131\u015f\u0131yor\u201d kabul edilir. Sunucu kurulur, ba\u011flant\u0131 yap\u0131l\u0131r, bir daha bak\u0131lmaz. Aylar ge\u00e7er. Kimse SSH\u2019ye dokunmaz \u00e7\u00fcnk\u00fc g\u00f6r\u00fcn\u00fcrde bir sorun yoktur. 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