{"id":37678,"date":"2026-01-12T11:30:51","date_gmt":"2026-01-12T08:30:51","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/okta-tokenlarini-anlamak-kimlik-dogrulama-ve-yetkilendirmede-derinlemesine-bir-bakis\/"},"modified":"2026-01-12T11:30:51","modified_gmt":"2026-01-12T08:30:51","slug":"okta-tokenlarini-anlamak-kimlik-dogrulama-ve-yetkilendirmede-derinlemesine-bir-bakis","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/okta-tokenlarini-anlamak-kimlik-dogrulama-ve-yetkilendirmede-derinlemesine-bir-bakis\/","title":{"rendered":"Okta Tokenlar\u0131n\u0131 Anlamak: Kimlik Do\u011frulama ve Yetkilendirmede Derinlemesine Bir Bak\u0131\u015f"},"content":{"rendered":"<h2>Okta Tokenlar\u0131n\u0131 Anlamak: Kimlik Do\u011frulama ve Yetkilendirmede Derinlemesine Bir Bak\u0131\u015f<\/h2>\n<p>Okta, modern kimlik ve eri\u015fim y\u00f6netimi (IAM) \u00e7\u00f6z\u00fcmlerinin \u00f6nde gelen sa\u011flay\u0131c\u0131lar\u0131ndan biridir. Uygulama ve API g\u00fcvenli\u011finde temel ta\u015f olan Okta tokenlar\u0131, kullan\u0131c\u0131 kimliklerini do\u011frulamak ve eri\u015fim yetkilerini belirlemek i\u00e7in kritik bir rol oynar. Bu makale, Okta ekosistemindeki Access Token, ID Token ve Refresh Token gibi farkl\u0131 token t\u00fcrlerini, \u00e7al\u0131\u015fma prensiplerini ve g\u00fcvenlik uygulamalar\u0131n\u0131 detayl\u0131ca inceleyecektir.<\/p>\n<h2>Okta ve Kimlik Y\u00f6netimi Nedir?<\/h2>\n<p>G\u00fcn\u00fcm\u00fcz\u00fcn dijital d\u00fcnyas\u0131nda, kullan\u0131c\u0131lar\u0131n ve sistemlerin kimli\u011fini g\u00fcvenli bir \u015fekilde do\u011frulamak ve kaynaklara eri\u015fimlerini y\u00f6netmek, her kurulu\u015f i\u00e7in kritik bir \u00f6neme sahiptir. Okta, bu karma\u015f\u0131k s\u00fcreci basitle\u015ftiren ve g\u00fcvenli\u011fini art\u0131ran bir platform olarak \u00f6ne \u00e7\u0131kar.<\/p>\n<h3>Kimlik ve Eri\u015fim Y\u00f6netimi (IAM) Nedir?<\/h3>\n<p>Kimlik ve Eri\u015fim Y\u00f6netimi (IAM), do\u011fru ki\u015filerin do\u011fru kaynaklara do\u011fru zamanda ve do\u011fru nedenlerle eri\u015fmesini sa\u011flayan g\u00fcvenlik \u00e7er\u00e7evelerini ve teknolojilerini kapsar. Bu, kullan\u0131c\u0131lar\u0131n kimliklerini do\u011frulama, yetkilendirme ve bu s\u00fcre\u00e7leri y\u00f6netme disiplinidir. IAM \u00e7\u00f6z\u00fcmleri, kullan\u0131c\u0131lar\u0131n kimliklerini merkezi bir noktadan y\u00f6neterek, g\u00fcvenlik politikalar\u0131n\u0131 uygulamay\u0131 ve uyumluluk gereksinimlerini kar\u015f\u0131lamay\u0131 kolayla\u015ft\u0131r\u0131r.<\/p>\n<h3>Okta&#8217;n\u0131n IAM&#8217;deki Rol\u00fc<\/h3>\n<p>Okta, bulut tabanl\u0131 bir IAM sa\u011flay\u0131c\u0131s\u0131 olarak, \u015firketlerin \u00e7al\u0131\u015fanlar\u0131, m\u00fc\u015fterileri ve i\u015f ortaklar\u0131 i\u00e7in g\u00fcvenli ve sorunsuz kimlik deneyimleri sunmas\u0131na yard\u0131mc\u0131 olur. Tek Oturum A\u00e7ma (SSO), \u00c7ok Fakt\u00f6rl\u00fc Kimlik Do\u011frulama (MFA), API Eri\u015fimi Y\u00f6netimi ve Kullan\u0131c\u0131 Ya\u015fam D\u00f6ng\u00fcs\u00fc Y\u00f6netimi gibi temel \u00f6zellikleri sayesinde Okta, kullan\u0131c\u0131lar\u0131n farkl\u0131 uygulamalara tek bir kimlik bilgisi setiyle eri\u015fmesini sa\u011flar. Bu, hem kullan\u0131c\u0131 deneyimini iyile\u015ftirir hem de IT y\u00f6neticilerinin i\u015f y\u00fck\u00fcn\u00fc azalt\u0131r.<\/p>\n<h3>Modern Uygulama Mimarilerinde Tokenlar\u0131n \u00d6nemi<\/h3>\n<p>Mikroservisler, API&#8217;ler ve bulut tabanl\u0131 uygulamalar\u0131n yayg\u0131nla\u015fmas\u0131yla birlikte, geleneksel oturum y\u00f6netimi y\u00f6ntemleri yetersiz kalmaya ba\u015flam\u0131\u015ft\u0131r. Tokenlar, bu modern mimarilerde kimlik do\u011frulama ve yetkilendirme i\u00e7in standart bir mekanizma haline gelmi\u015ftir. Okta tokenlar\u0131, kullan\u0131c\u0131n\u0131n kimli\u011fini ve yetkilerini ta\u015f\u0131yan, kriptografik olarak imzalanm\u0131\u015f k\u00fc\u00e7\u00fck veri par\u00e7alar\u0131d\u0131r. Bu tokenlar sayesinde, uygulamalar ve API&#8217;ler, kullan\u0131c\u0131n\u0131n kimli\u011fini her istekte yeniden do\u011frulamak zorunda kalmadan g\u00fcvenli bir \u015fekilde ileti\u015fim kurabilir.<\/p>\n<h2>Okta Token T\u00fcrleri: Genel Bak\u0131\u015f<\/h2>\n<p>Okta, kimlik do\u011frulama ve yetkilendirme s\u00fcre\u00e7lerinde \u00fc\u00e7 ana token t\u00fcr\u00fcn\u00fc kullan\u0131r: Access Token, ID Token ve Refresh Token. Her birinin belirli bir amac\u0131 ve kullan\u0131m alan\u0131 vard\u0131r.<\/p>\n<h3>Access Token (Eri\u015fim Token\u0131)<\/h3>\n<p>Access Token, bir kullan\u0131c\u0131n\u0131n belirli bir kayna\u011fa (\u00f6rne\u011fin bir API&#8217;ye) eri\u015fmek i\u00e7in sahip oldu\u011fu yetkiyi temsil eder. Genellikle k\u0131sa \u00f6m\u00fcrl\u00fcd\u00fcr ve OAuth 2.0 yetkilendirme \u00e7er\u00e7evesinin temelini olu\u015fturur. API&#8217;lere yap\u0131lan isteklerde yetkilendirme ba\u015fl\u0131\u011f\u0131nda g\u00f6nderilir.<\/p>\n<h3>ID Token (Kimlik Token\u0131)<\/h3>\n<p>ID Token, kullan\u0131c\u0131n\u0131n kimli\u011fini do\u011frulayan ve kullan\u0131c\u0131 hakk\u0131nda temel bilgileri (ad, e-posta gibi) i\u00e7eren bir token&#8217;d\u0131r. OpenID Connect (OIDC) protokol\u00fcn\u00fcn bir par\u00e7as\u0131d\u0131r ve kullan\u0131c\u0131n\u0131n kimli\u011fini g\u00fcvenli bir \u015fekilde uygulamaya iletmek i\u00e7in kullan\u0131l\u0131r. Uygulama, bu token&#8217;\u0131 do\u011frulayarak kullan\u0131c\u0131n\u0131n kimli\u011finden emin olur.<\/p>\n<h3>Refresh Token (Yenileme Token\u0131)<\/h3>\n<p>Refresh Token, Access Token&#8217;\u0131n s\u00fcresi doldu\u011funda yeni bir Access Token (ve potansiyel olarak yeni bir ID Token) almak i\u00e7in kullan\u0131l\u0131r. Uzun \u00f6m\u00fcrl\u00fcd\u00fcr ve genellikle daha g\u00fcvenli bir \u015fekilde saklanmas\u0131 gerekir. Kullan\u0131c\u0131n\u0131n tekrar kimlik do\u011frulamas\u0131 yapmas\u0131na gerek kalmadan oturumun devaml\u0131l\u0131\u011f\u0131n\u0131 sa\u011flar.<\/p>\n<h3>Tokenlar\u0131n Ya\u015fam D\u00f6ng\u00fcs\u00fc<\/h3>\n<p>Tokenlar\u0131n ya\u015fam d\u00f6ng\u00fcs\u00fc, bir kullan\u0131c\u0131n\u0131n kimlik do\u011frulama s\u00fcrecinden ge\u00e7mesiyle ba\u015flar. Kullan\u0131c\u0131 Okta&#8217;da kimlik do\u011frulamas\u0131n\u0131 ba\u015far\u0131yla tamamlad\u0131\u011f\u0131nda, Okta genellikle bir ID Token, bir Access Token ve bir Refresh Token verir. Access Token ve ID Token k\u0131sa bir s\u00fcre sonra sona ererken, Refresh Token daha uzun s\u00fcre ge\u00e7erli kal\u0131r ve kullan\u0131c\u0131n\u0131n oturumunu yenilemek i\u00e7in kullan\u0131l\u0131r. Bu mekanizma, hem g\u00fcvenlik hem de kullan\u0131c\u0131 deneyimi a\u00e7\u0131s\u0131ndan \u00f6nemlidir.<\/p>\n<h2>Access Tokenlar: Yetkilendirmenin Kalbi<\/h2>\n<p>Access Tokenlar, Okta ekosisteminde yetkilendirme mekanizmas\u0131n\u0131n temelini olu\u015fturur. Bir kullan\u0131c\u0131n\u0131n veya istemcinin belirli bir kayna\u011fa eri\u015fim yetkisine sahip oldu\u011funu kan\u0131tlar.<\/p>\n<h3>Yap\u0131s\u0131 ve \u0130\u00e7eri\u011fi (JWT Format\u0131)<\/h3>\n<p>Okta Access Tokenlar\u0131 genellikle JSON Web Token (JWT) format\u0131ndad\u0131r. Bir JWT \u00fc\u00e7 ana b\u00f6l\u00fcmden olu\u015fur: Ba\u015fl\u0131k (Header), Y\u00fck (Payload) ve \u0130mza (Signature). Bu b\u00f6l\u00fcmler noktalarla ayr\u0131l\u0131r ve Base64Url ile kodlan\u0131r.<\/p>\n<ul>\n<li><strong>Ba\u015fl\u0131k (Header):<\/strong> Token t\u00fcr\u00fcn\u00fc (JWT) ve kullan\u0131lan imzalama algoritmas\u0131n\u0131 (\u00f6rne\u011fin, HS256 veya RS256) i\u00e7erir.<\/li>\n<li><strong>Y\u00fck (Payload):<\/strong> Token&#8217;\u0131n as\u0131l verilerini, yani &#8220;claim&#8221;leri i\u00e7erir. Bu claim&#8217;ler, token&#8217;\u0131n kime verildi\u011fi (<code>sub<\/code> &#8211; subject), kim taraf\u0131ndan verildi\u011fi (<code>iss<\/code> &#8211; issuer), ne zaman verildi\u011fi (<code>iat<\/code> &#8211; issued at), ne zamana kadar ge\u00e7erli oldu\u011fu (<code>exp<\/code> &#8211; expiration) ve hangi kaynaklara eri\u015fim yetkisi verdi\u011fi (<code>scope<\/code>) gibi bilgileri bar\u0131nd\u0131r\u0131r.<\/li>\n<li><strong>\u0130mza (Signature):<\/strong> Ba\u015fl\u0131k ve y\u00fck\u00fcn bir s\u0131r anahtar\u0131 veya \u00f6zel bir anahtar kullan\u0131larak \u015fifrelenmesiyle olu\u015fturulur. Bu imza, token&#8217;\u0131n b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc ve kimli\u011fini do\u011frulamak i\u00e7in kullan\u0131l\u0131r; yani token&#8217;\u0131n yolda de\u011fi\u015ftirilmedi\u011fini garanti eder.<\/li>\n<\/ul>\n<p>\u00d6rnek bir JWT (kodlanm\u0131\u015f):<\/p>\n<pre><code class=\"language-jwt\">eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c<\/pre>\n<p><\/code><\/p>\n<p>Bu token'\u0131 <a href=\"https:\/\/jwt.io\" target=\"_blank\">jwt.io<\/a> gibi bir ara\u00e7la \u00e7\u00f6zd\u00fc\u011f\u00fcn\u00fczde i\u00e7eri\u011fini g\u00f6rebilirsiniz.<\/p>\n<h3>Kullan\u0131m Alanlar\u0131 ve Ama\u00e7lar\u0131<\/h3>\n<p>Access Token'\u0131n temel amac\u0131, bir kullan\u0131c\u0131n\u0131n veya istemcinin belirli bir API'ye veya kayna\u011fa eri\u015fim yetkisini kan\u0131tlamakt\u0131r. \u00d6rne\u011fin, bir mobil uygulama kullan\u0131c\u0131s\u0131, Okta'da kimlik do\u011frulamas\u0131ndan ge\u00e7tikten sonra ald\u0131\u011f\u0131 Access Token'\u0131, arka u\u00e7 API'lerine yapt\u0131\u011f\u0131 her istekte \"Authorization\" ba\u015fl\u0131\u011f\u0131nda (<code>Bearer [Access Token]<\/code> \u015feklinde) g\u00f6nderir. API, bu token'\u0131 do\u011frulayarak iste\u011fin yetkili bir kullan\u0131c\u0131dan geldi\u011fini anlar ve iste\u011fi i\u015fler.<\/p>\n<h3>Ge\u00e7erlilik S\u00fcresi ve Yenileme \u0130htiyac\u0131<\/h3>\n<p>Access Tokenlar genellikle k\u0131sa \u00f6m\u00fcrl\u00fcd\u00fcr (\u00f6rne\u011fin, 5 dakika ila 1 saat). Bu k\u0131sa \u00f6m\u00fcr, token \u00e7al\u0131nmas\u0131 durumunda potansiyel zarar\u0131 minimize etmek i\u00e7in bir g\u00fcvenlik \u00f6nlemidir. S\u00fcresi dolan bir Access Token ile yap\u0131lan istekler reddedilir. Bu durumda, uygulaman\u0131n yeni bir Access Token almak i\u00e7in bir Refresh Token kullanmas\u0131 gerekir.<\/p>\n<h3>\u00d6rnek Bir Access Token (JWT Decode)<\/h3>\n<p>Okta'dan al\u0131nan ger\u00e7ek bir Access Token'\u0131 \u00e7\u00f6zd\u00fc\u011f\u00fcn\u00fczde, a\u015fa\u011f\u0131daki gibi bir yap\u0131 g\u00f6rebilirsiniz (payload k\u0131sm\u0131):<\/p>\n<pre><code class=\"language-json\">{\n  \"ver\": 1,\n  \"jti\": \"AT.abcdef12345...\",\n  \"iss\": \"https:\/\/{yourOktaDomain}\/oauth2\/default\",\n  \"aud\": \"api:\/\/default\",\n  \"cid\": \"0oa2x...\",\n  \"uid\": \"00u2x...\",\n  \"scp\": [\"openid\", \"profile\", \"email\"],\n  \"exp\": 1678886400,\n  \"iat\": 1678882800,\n  \"sub\": \"user@example.com\"\n}<\/pre>\n<p><\/code><\/p>\n<ul>\n<li><code>iss<\/code>: Token'\u0131 veren Okta yetkilendirme sunucusu.<\/li>\n<li><code>aud<\/code>: Token'\u0131n hedef kitlesi (genellikle API'nizin kimli\u011fi).<\/li>\n<li><code>exp<\/code>: Token'\u0131n sona erme zaman\u0131 (Unix timestamp).<\/li>\n<li><code>sub<\/code>: Token'\u0131n konusu (genellikle kullan\u0131c\u0131n\u0131n benzersiz kimli\u011fi veya e-postas\u0131).<\/li>\n<li><code>scp<\/code>: Token'\u0131n kapsad\u0131\u011f\u0131 yetki alanlar\u0131 (scopes).<\/li>\n<\/ul>\n<h2>ID Tokenlar: Kimlik Bilgilerinin Ta\u015f\u0131y\u0131c\u0131s\u0131<\/h2>\n<p>ID Tokenlar, kullan\u0131c\u0131n\u0131n kimli\u011fini do\u011frulamak ve temel kullan\u0131c\u0131 bilgilerini g\u00fcvenli bir \u015fekilde uygulamaya iletmek i\u00e7in kullan\u0131l\u0131r. OpenID Connect (OIDC) protokol\u00fcn\u00fcn ayr\u0131lmaz bir par\u00e7as\u0131d\u0131r.<\/p>\n<h3>Yap\u0131s\u0131 ve \u0130\u00e7eri\u011fi (Kullan\u0131c\u0131 Bilgileri)<\/h3>\n<p>Access Tokenlar gibi, ID Tokenlar da genellikle JWT format\u0131ndad\u0131r. Ancak i\u00e7erikleri (payload) farkl\u0131d\u0131r. ID Token'\u0131n payload'\u0131, kullan\u0131c\u0131n\u0131n kimli\u011fiyle ilgili standart ve \u00f6zel claim'leri i\u00e7erir.<\/p>\n<ul>\n<li><strong>Standart Claim'ler:<\/strong> <code>sub<\/code> (kullan\u0131c\u0131n\u0131n benzersiz kimli\u011fi), <code>name<\/code> (tam ad\u0131), <code>given_name<\/code> (ad\u0131), <code>family_name<\/code> (soyad\u0131), <code>email<\/code> (e-posta adresi), <code>picture<\/code> (profil resmi URL'si) gibi bilgileri i\u00e7erir.<\/li>\n<li><strong>OIDC \u00d6zel Claim'leri:<\/strong> <code>iss<\/code> (veren), <code>aud<\/code> (hedef kitle), <code>exp<\/code> (sona erme zaman\u0131), <code>iat<\/code> (verilme zaman\u0131) gibi OIDC standartlar\u0131na uygun claim'ler de bulunur.<\/li>\n<\/ul>\n<h3>Kullan\u0131m Alanlar\u0131 (Kullan\u0131c\u0131 Kimli\u011fini Do\u011frulama)<\/h3>\n<p>ID Token'\u0131n birincil kullan\u0131m alan\u0131, uygulaman\u0131n kullan\u0131c\u0131n\u0131n kimli\u011fini do\u011frulamas\u0131d\u0131r. Bir kullan\u0131c\u0131 Okta'da oturum a\u00e7t\u0131\u011f\u0131nda, uygulama bir ID Token al\u0131r. Uygulama, bu token'\u0131n imzas\u0131n\u0131 do\u011frulayarak ve <code>iss<\/code>, <code>aud<\/code>, <code>exp<\/code> gibi claim'leri kontrol ederek token'\u0131n ge\u00e7erlili\u011finden ve kullan\u0131c\u0131n\u0131n kimli\u011finden emin olur. Bu sayede uygulama, kullan\u0131c\u0131 aray\u00fcz\u00fcnde kullan\u0131c\u0131n\u0131n ad\u0131n\u0131 g\u00f6r\u00fcnt\u00fcleyebilir veya kullan\u0131c\u0131ya \u00f6zel i\u00e7erik sunabilir.<\/p>\n<h3>ID Token Do\u011frulama Mekanizmalar\u0131<\/h3>\n<p>Bir uygulaman\u0131n bir ID Token'\u0131 do\u011fru bir \u015fekilde do\u011frulamas\u0131 hayati \u00f6nem ta\u015f\u0131r. Do\u011frulama ad\u0131mlar\u0131 \u015funlar\u0131 i\u00e7erir:<\/p>\n<ol>\n<li><strong>\u0130mza Do\u011frulamas\u0131:<\/strong> Token'\u0131n, Okta'n\u0131n herkese a\u00e7\u0131k anahtar\u0131 kullan\u0131larak do\u011fru \u015fekilde imzaland\u0131\u011f\u0131n\u0131 kontrol etmek. Bu, token'\u0131n yetkili bir kaynak taraf\u0131ndan verildi\u011fini ve yolda de\u011fi\u015ftirilmedi\u011fini garanti eder.<\/li>\n<li><strong>Issuer (Veren) Do\u011frulamas\u0131:<\/strong> <code>iss<\/code> claim'inin beklenen Okta yetkilendirme sunucusu URL'si ile e\u015fle\u015fti\u011fini kontrol etmek.<\/li>\n<li><strong>Audience (Hedef Kitle) Do\u011frulamas\u0131:<\/strong> <code>aud<\/code> claim'inin uygulaman\u0131n kendi istemci kimli\u011fi ile e\u015fle\u015fti\u011fini kontrol etmek.<\/li>\n<li><strong>Expiration (Sona Erme) Do\u011frulamas\u0131:<\/strong> <code>exp<\/code> claim'inin hen\u00fcz ge\u00e7medi\u011fini kontrol etmek.<\/li>\n<li><strong>Nonce Do\u011frulamas\u0131 (iste\u011fe ba\u011fl\u0131 ama \u00f6nerilir):<\/strong> CSRF sald\u0131r\u0131lar\u0131na kar\u015f\u0131 koruma sa\u011flamak i\u00e7in, kimlik do\u011frulama iste\u011finde g\u00f6nderilen bir <code>nonce<\/code> de\u011ferinin ID Token'daki <code>nonce<\/code> claim'i ile e\u015fle\u015fti\u011fini kontrol etmek.<\/li>\n<\/ol>\n<h3>\u00d6rnek Bir ID Token (JWT Decode)<\/h3>\n<p>Okta'dan al\u0131nan bir ID Token'\u0131 \u00e7\u00f6zd\u00fc\u011f\u00fcn\u00fczde, payload k\u0131sm\u0131 \u015f\u00f6yle g\u00f6r\u00fcnebilir:<\/p>\n<pre><code class=\"language-json\">{\n  \"iss\": \"https:\/\/{yourOktaDomain}\/oauth2\/default\",\n  \"aud\": \"0oa2x...\",\n  \"exp\": 1678886400,\n  \"iat\": 1678882800,\n  \"auth_time\": 1678882750,\n  \"sub\": \"00u2x...\",\n  \"name\": \"John Doe\",\n  \"given_name\": \"John\",\n  \"family_name\": \"Doe\",\n  \"email\": \"john.doe@example.com\",\n  \"locale\": \"en-US\",\n  \"preferred_username\": \"john.doe@example.com\"\n}<\/pre>\n<p><\/code><\/p>\n<ul>\n<li><code>sub<\/code>: Kullan\u0131c\u0131n\u0131n Okta'daki benzersiz kimli\u011fi.<\/li>\n<li><code>name<\/code>, <code>given_name<\/code>, <code>family_name<\/code>, <code>email<\/code>: Kullan\u0131c\u0131n\u0131n profil bilgileri.<\/li>\n<\/ul>\n<h2>Refresh Tokenlar: S\u00fcrekli Oturum Sa\u011flama<\/h2>\n<p>Refresh Tokenlar, kullan\u0131c\u0131 deneyimini kesintiye u\u011fratmadan uzun s\u00fcreli oturumlar sa\u011flamak i\u00e7in tasarlanm\u0131\u015ft\u0131r. Access Tokenlar\u0131n k\u0131sa \u00f6m\u00fcrl\u00fc olmas\u0131 nedeniyle, Refresh Tokenlar yeni Access Tokenlar almak i\u00e7in kritik bir rol oynar.<\/p>\n<h3>Amac\u0131 ve G\u00fcvenlik \u00d6nlemleri<\/h3>\n<p>Refresh Token'\u0131n temel amac\u0131, Access Token'\u0131n s\u00fcresi doldu\u011funda kullan\u0131c\u0131n\u0131n tekrar kimlik do\u011frulama yapmas\u0131na gerek kalmadan yeni bir Access Token (ve iste\u011fe ba\u011fl\u0131 olarak yeni bir ID Token) almakt\u0131r. Bu, kullan\u0131c\u0131lar\u0131n uygulamalar\u0131 kesintisiz kullanmaya devam etmesini sa\u011flar. Ancak, Refresh Tokenlar uzun \u00f6m\u00fcrl\u00fc oldu\u011fu i\u00e7in, \u00e7al\u0131nmalar\u0131 durumunda ciddi g\u00fcvenlik riskleri ta\u015f\u0131yabilirler. Bu nedenle, Refresh Tokenlar\u0131n \u00e7ok daha g\u00fcvenli bir \u015fekilde saklanmas\u0131 ve y\u00f6netilmesi gerekir.<\/p>\n<p>Okta, Refresh Tokenlar\u0131n g\u00fcvenli\u011fini art\u0131rmak i\u00e7in \u00e7e\u015fitli \u00f6nlemler sunar:<\/p>\n<ul>\n<li><strong>Tek Kullan\u0131ml\u0131k Refresh Tokenlar (One-Time Use):<\/strong> Her kullan\u0131mda yeni bir Refresh Token verilir ve eski token ge\u00e7ersiz k\u0131l\u0131n\u0131r. Bu, \u00e7al\u0131nan bir Refresh Token'\u0131n yaln\u0131zca bir kez kullan\u0131lmas\u0131na izin verir.<\/li>\n<li><strong>Token \u0130ptali:<\/strong> Okta API'leri arac\u0131l\u0131\u011f\u0131yla Refresh Tokenlar manuel olarak veya belirli g\u00fcvenlik olaylar\u0131nda (\u00f6rne\u011fin, \u015fifre de\u011fi\u015fikli\u011fi) otomatik olarak iptal edilebilir.<\/li>\n<li><strong>Kapsam K\u0131s\u0131tlamas\u0131:<\/strong> Refresh Tokenlar, belirli yetki alanlar\u0131yla (scopes) s\u0131n\u0131rlanabilir, b\u00f6ylece yaln\u0131zca belirli API'lere eri\u015fim i\u00e7in kullan\u0131labilirler.<\/li>\n<\/ul>\n<h3>Refresh Token Kullan\u0131m Ak\u0131\u015f\u0131<\/h3>\n<p>Refresh Token kullan\u0131m ak\u0131\u015f\u0131 genellikle \u015fu ad\u0131mlar\u0131 i\u00e7erir:<\/p>\n<ol>\n<li>Kullan\u0131c\u0131 Okta'da kimlik do\u011frulamas\u0131n\u0131 tamamlar ve uygulama bir Access Token, ID Token ve Refresh Token al\u0131r.<\/li>\n<li>Uygulama, Access Token'\u0131 kullanarak API istekleri yapar.<\/li>\n<li>Access Token'\u0131n s\u00fcresi doldu\u011funda, API istekleri reddedilmeye ba\u015flar.<\/li>\n<li>Uygulama, Refresh Token'\u0131 kullanarak Okta'ya yeni bir Access Token (ve iste\u011fe ba\u011fl\u0131 olarak yeni bir ID Token) talebinde bulunur. Bu istek genellikle bir POST iste\u011fi olarak <code>\/oauth2\/default\/v1\/token<\/code> endpoint'ine yap\u0131l\u0131r.<\/li>\n<li>Okta, Refresh Token'\u0131 do\u011frular ve ge\u00e7erliyse yeni bir Access Token (ve ID Token) verir.<\/li>\n<li>Uygulama, yeni Access Token'\u0131 kullanarak API isteklerine devam eder.<\/li>\n<\/ol>\n<p>\u00d6rnek bir Refresh Token iste\u011fi (pseudo kod):<\/p>\n<pre><code class=\"language-http\">POST \/oauth2\/default\/v1\/token HTTP\/1.1\nHost: {yourOktaDomain}\nContent-Type: application\/x-www-form-urlencoded\n\ngrant_type=refresh_token&\nclient_id={yourClientId}&\nclient_secret={yourClientSecret}&\nrefresh_token={yourRefreshToken}<\/pre>\n<p><\/code><\/p>\n<h3>Refresh Tokenlar\u0131n Saklanmas\u0131 ve Y\u00f6netimi<\/h3>\n<p>Refresh Tokenlar, uzun \u00f6m\u00fcrl\u00fc olduklar\u0131 i\u00e7in Access Tokenlara g\u00f6re daha hassas kabul edilir. Bu nedenle, istemci taraf\u0131nda (taray\u0131c\u0131 veya mobil uygulama) g\u00fcvenli bir \u015fekilde saklanmalar\u0131 kritik \u00f6neme sahiptir:<\/p>\n<ul>\n<li><strong>Sunucu Taraf\u0131nda Saklama:<\/strong> Geleneksel web uygulamalar\u0131nda, Refresh Tokenlar genellikle sunucu taraf\u0131nda g\u00fcvenli, \u015fifrelenmi\u015f bir veritaban\u0131nda saklan\u0131r.<\/li>\n<li><strong>Mobil Uygulamalarda:<\/strong> Cihaz\u0131n g\u00fcvenli depolama alanlar\u0131 (\u00f6rne\u011fin, iOS Keychain, Android Keystore) kullan\u0131lmal\u0131d\u0131r.<\/li>\n<li><strong>Tek Sayfal\u0131 Uygulamalarda (SPA):<\/strong> Refresh Tokenlar\u0131n taray\u0131c\u0131da do\u011frudan saklanmas\u0131 (localStorage veya sessionStorage gibi) \u00f6nerilmez. Bunun yerine, Refresh Token'\u0131 HTTP-only, secure \u00e7erezlerde saklamak veya Backend-for-Frontend (BFF) mimarisi kullanmak daha g\u00fcvenli yakla\u015f\u0131mlard\u0131r.<\/li>\n<\/ul>\n<h2>Token Ak\u0131\u015flar\u0131 ve Kullan\u0131m Senaryolar\u0131<\/h2>\n<p>Okta tokenlar\u0131, farkl\u0131 uygulama t\u00fcrleri ve g\u00fcvenlik gereksinimleri i\u00e7in \u00e7e\u015fitli OAuth 2.0 ak\u0131\u015flar\u0131 arac\u0131l\u0131\u011f\u0131yla elde edilir. Bu ak\u0131\u015flar, tokenlar\u0131n g\u00fcvenli bir \u015fekilde nas\u0131l al\u0131nd\u0131\u011f\u0131n\u0131 ve kullan\u0131ld\u0131\u011f\u0131n\u0131 belirler.<\/p>\n<h3>Authorization Code Flow (Yetkilendirme Kodu Ak\u0131\u015f\u0131)<\/h3>\n<p>Bu, web uygulamalar\u0131 ve mobil\/masa\u00fcst\u00fc uygulamalar\u0131 i\u00e7in \u00f6nerilen en g\u00fcvenli ak\u0131\u015ft\u0131r. Kullan\u0131c\u0131, Okta'da kimlik do\u011frulamas\u0131n\u0131 tamamlad\u0131ktan sonra, Okta uygulamaya k\u0131sa \u00f6m\u00fcrl\u00fc bir yetkilendirme kodu g\u00f6nderir. Uygulama bu kodu, kendi gizli anahtar\u0131yla birlikte Okta'ya g\u00f6ndererek Access Token, ID Token ve Refresh Token'\u0131 al\u0131r. Kodun do\u011frudan taray\u0131c\u0131da de\u011fil, arka u\u00e7 sunucusunda i\u015flenmesi, tokenlar\u0131n taray\u0131c\u0131dan s\u0131zma riskini azalt\u0131r.<\/p>\n<h3>Implicit Flow (\u00d6rt\u00fcl\u00fc Ak\u0131\u015f)<\/h3>\n<p>Implicit Flow, Access Token ve ID Token'\u0131n do\u011frudan taray\u0131c\u0131ya y\u00f6nlendirme URL'si \u00fczerinden d\u00f6nd\u00fcr\u00fcld\u00fc\u011f\u00fc bir ak\u0131\u015ft\u0131. Ge\u00e7mi\u015fte tek sayfal\u0131 uygulamalar (SPA) i\u00e7in kullan\u0131l\u0131yordu. Ancak, g\u00fcvenlik a\u00e7\u0131klar\u0131 (tokenlar\u0131n URL'de g\u00f6r\u00fcn\u00fcr olmas\u0131, taray\u0131c\u0131 ge\u00e7mi\u015finde kalmas\u0131) nedeniyle art\u0131k \u00f6nerilmemektedir ve \u00e7o\u011fu OIDC sa\u011flay\u0131c\u0131s\u0131 taraf\u0131ndan kullan\u0131mdan kald\u0131r\u0131lm\u0131\u015ft\u0131r. Yerine Authorization Code Flow with PKCE (Proof Key for Code Exchange) \u00f6nerilmektedir.<\/p>\n<h3>Client Credentials Flow (\u0130stemci Kimlik Bilgileri Ak\u0131\u015f\u0131)<\/h3>\n<p>Bu ak\u0131\u015f, kullan\u0131c\u0131 ba\u011flam\u0131 olmadan, do\u011frudan bir uygulaman\u0131n (istemcinin) kendi kimlik bilgilerini kullanarak bir API'ye eri\u015fim token\u0131 almas\u0131 gerekti\u011finde kullan\u0131l\u0131r. Genellikle sunucudan sunucuya ileti\u015fimde veya arka plan servislerinde kullan\u0131l\u0131r. Bir kullan\u0131c\u0131 ad\u0131na i\u015flem yap\u0131lmaz, uygulama kendi ad\u0131na yetkilendirilir.<\/p>\n<h3>Single Page Application (SPA) ve Mobil Uygulama Ak\u0131\u015flar\u0131<\/h3>\n<p>Modern SPA'lar ve mobil uygulamalar i\u00e7in en g\u00fcvenli ak\u0131\u015f, <strong>Authorization Code Flow with PKCE<\/strong>'dir. Bu ak\u0131\u015f, istemci gizli anahtar\u0131 saklayamayan kamu istemcileri (public clients) i\u00e7in tasarlanm\u0131\u015ft\u0131r. PKCE, yetkilendirme kodu \u00e7al\u0131nsa bile, k\u00f6t\u00fc niyetli bir istemcinin tokenlar\u0131 almas\u0131n\u0131 engelleyen ek bir g\u00fcvenlik katman\u0131 sa\u011flar. Okta SDK'lar\u0131 ve k\u00fct\u00fcphaneleri, bu ak\u0131\u015f\u0131 uygulamay\u0131 kolayla\u015ft\u0131r\u0131r.<\/p>\n<h2>G\u00fcvenlik En \u0130yi Uygulamalar\u0131 ve Dikkat Edilmesi Gerekenler<\/h2>\n<p>Okta tokenlar\u0131n\u0131 kullan\u0131rken g\u00fcvenli\u011fi en \u00fcst d\u00fczeyde tutmak i\u00e7in belirli en iyi uygulamalara uymak \u00f6nemlidir.<\/p>\n<h3>Token Depolama G\u00fcvenli\u011fi<\/h3>\n<ul>\n<li><strong>Access Tokenlar:<\/strong> Genellikle k\u0131sa \u00f6m\u00fcrl\u00fc olduklar\u0131 i\u00e7in taray\u0131c\u0131n\u0131n belle\u011finde (memory) veya g\u00fcvenli HTTP-only \u00e7erezlerde saklanabilirler. localStorage veya sessionStorage'da saklamak XSS sald\u0131r\u0131lar\u0131na kar\u015f\u0131 savunmas\u0131zl\u0131k yaratabilir.<\/li>\n<li><strong>Refresh Tokenlar:<\/strong> Uzun \u00f6m\u00fcrl\u00fc olduklar\u0131 i\u00e7in en hassas tokenlard\u0131r. Taray\u0131c\u0131da asla localStorage veya sessionStorage'da saklanmamal\u0131d\u0131r. HTTP-only, secure \u00e7erezler veya Backend-for-Frontend (BFF) mimarisi gibi sunucu taraf\u0131 \u00e7\u00f6z\u00fcmler tercih edilmelidir. Mobil uygulamalarda ise cihaz\u0131n g\u00fcvenli depolama mekanizmalar\u0131 kullan\u0131lmal\u0131d\u0131r.<\/li>\n<\/ul>\n<h3>Token Ge\u00e7erlilik S\u00fcreleri ve Y\u00f6netimi<\/h3>\n<p>Access Tokenlar\u0131n k\u0131sa \u00f6m\u00fcrl\u00fc olmas\u0131 g\u00fcvenlik a\u00e7\u0131s\u0131ndan faydal\u0131d\u0131r. S\u00fcreleri doldu\u011funda, Refresh Tokenlar kullan\u0131larak yeni tokenlar al\u0131nmal\u0131d\u0131r. Okta'n\u0131n token \u00f6m\u00fcrlerini ve Refresh Token politikalar\u0131n\u0131 do\u011fru bir \u015fekilde yap\u0131land\u0131rmak, hem g\u00fcvenlik hem de kullan\u0131c\u0131 deneyimi dengesini sa\u011flamak i\u00e7in \u00f6nemlidir.<\/p>\n<h3>Token Do\u011frulama ve \u0130ptali<\/h3>\n<ul>\n<li><strong>Her \u0130stemci Taraf\u0131ndan Do\u011frulama:<\/strong> Uygulamalar, ald\u0131klar\u0131 ID Token ve Access Tokenlar\u0131 her zaman do\u011frulamal\u0131d\u0131r.<\/li>\n<li><strong>API Taraf\u0131ndan Do\u011frulama:<\/strong> API'ler, gelen her Access Token'\u0131 do\u011frulamal\u0131d\u0131r. Okta, token do\u011frulama i\u00e7in \u00f6zel endpoint'ler (<code>\/introspect<\/code>) veya JWT do\u011frulama k\u00fct\u00fcphaneleri sunar.<\/li>\n<li><strong>Token \u0130ptali:<\/strong> Kullan\u0131c\u0131 oturumunu kapatt\u0131\u011f\u0131nda veya \u015fifresini de\u011fi\u015ftirdi\u011finde ilgili Refresh Token ve Access Tokenlar Okta API'leri arac\u0131l\u0131\u011f\u0131yla iptal edilmelidir. Bu, \u00e7al\u0131nan tokenlar\u0131n yetkisiz eri\u015fim sa\u011flamas\u0131n\u0131 engeller.<\/li>\n<\/ul>\n<h3>Cross-Site Scripting (XSS) ve Cross-Site Request Forgery (CSRF) Korumas\u0131<\/h3>\n<ul>\n<li><strong>XSS Korumas\u0131:<\/strong> Tokenlar\u0131n localStorage\/sessionStorage'da saklanmas\u0131ndan ka\u00e7\u0131nmak ve HTTP-only \u00e7erezler kullanmak, XSS sald\u0131r\u0131lar\u0131n\u0131n tokenlar\u0131 \u00e7almas\u0131n\u0131 zorla\u015ft\u0131r\u0131r.<\/li>\n<li><strong>CSRF Korumas\u0131:<\/strong> Authorization Code Flow'da <code>state<\/code> parametresini ve OIDC'de <code>nonce<\/code> parametresini kullanmak, CSRF sald\u0131r\u0131lar\u0131na kar\u015f\u0131 koruma sa\u011flar.<\/li>\n<\/ul>\n<h2>Sonu\u00e7<\/h2>\n<p>Okta tokenlar\u0131, modern kimlik do\u011frulama ve yetkilendirme s\u00fcre\u00e7lerinin temelini olu\u015fturur. Access Tokenlar, ID Tokenlar ve Refresh Tokenlar, her biri belirli bir amaca hizmet ederek g\u00fcvenli ve kesintisiz kullan\u0131c\u0131 deneyimleri sa\u011flar. Bu tokenlar\u0131n yap\u0131s\u0131n\u0131, kullan\u0131m alanlar\u0131n\u0131 ve ilgili g\u00fcvenlik en iyi uygulamalar\u0131n\u0131 anlamak, geli\u015ftiricilerin ve g\u00fcvenlik uzmanlar\u0131n\u0131n sa\u011flam, \u00f6l\u00e7eklenebilir ve g\u00fcvenli uygulamalar in\u015fa etmeleri i\u00e7in kritik \u00f6neme sahiptir. Okta'n\u0131n sa\u011flad\u0131\u011f\u0131 bu g\u00fc\u00e7l\u00fc mekanizmalar sayesinde, kimlik y\u00f6netimi karma\u015f\u0131kl\u0131\u011f\u0131 azal\u0131rken, g\u00fcvenlik standartlar\u0131 y\u00fckselmektedir.<\/p>\n<h2>S\u0131k\u00e7a Sorulan Sorular (SSS)<\/h2>\n<h3>Access Token ile ID Token aras\u0131ndaki fark nedir?<\/h3>\n<p><strong>Access Token<\/strong>, bir kullan\u0131c\u0131n\u0131n belirli bir API'ye veya kayna\u011fa eri\u015fim yetkisini temsil eder ve yetkilendirme i\u00e7in kullan\u0131l\u0131r. <strong>ID Token<\/strong> ise kullan\u0131c\u0131n\u0131n kimli\u011fini do\u011frular ve kullan\u0131c\u0131 hakk\u0131nda temel bilgileri (ad, e-posta vb.) i\u00e7erir. ID Token kimlik<\/p>\n","protected":false},"excerpt":{"rendered":"Okta, modern kimlik ve eri\u015fim y\u00f6netimi (IAM) \u00e7\u00f6z\u00fcmlerinin \u00f6nde gelen sa\u011flay\u0131c\u0131lar\u0131ndan biridir. Uygulama ve API g\u00fcvenli\u011finde temel ta\u015f olan Okta&#8230;","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-37678","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-genel","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.5 (Yoast SEO v25.3.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Okta Tokenlar\u0131n\u0131 Anlamak: Kimlik Do\u011frulama ve Yetkilendirmede Derinlemesine Bir Bak\u0131\u015f - Kodlar\u0131n Gizemli D\u00fcnyas\u0131<\/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:\/\/fatihsoysal.com\/blog\/okta-tokenlarini-anlamak-kimlik-dogrulama-ve-yetkilendirmede-derinlemesine-bir-bakis\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Okta Tokenlar\u0131n\u0131 Anlamak: Kimlik Do\u011frulama ve Yetkilendirmede Derinlemesine Bir Bak\u0131\u015f\" \/>\n<meta property=\"og:description\" content=\"Okta, modern kimlik ve eri\u015fim y\u00f6netimi (IAM) \u00e7\u00f6z\u00fcmlerinin \u00f6nde gelen sa\u011flay\u0131c\u0131lar\u0131ndan biridir. 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