Merge branch 'master' into master

src/SUMMARY.md

@@ -23,10 +23,10 @@
 - [Ağ Güvenliği](ag_guvenligi/README.md)
   - [Güvenli Bağlantılar](ag_guvenligi/guvenli_baglantilar.md)
   - [Güvenli Web Gezintisi](ag_guvenligi/guvenli_web_gezintisi.md)
-  - [Sertifikalar](ag_guvenligi/sertifikalar.md)
+  - [Let's Encrypt](ag_guvenligi/letsencrypt.md)
   - [StartTLS](ag_guvenligi/starttls.md)
   - [Tor](ag_guvenligi/tor.md)
   - [Vpn](ag_guvenligi/vpn/vpn.md)
 ---
-
+[Katkıda Bulunanlar ve Lisans](credits.md)
 [Kaynaklar](resources.md)

src/ag_guvenligi/letsencrypt.md

@@ -0,0 +1,50 @@
+# Let's Encrypt
+
+![Let's Encrypt](letsencrypt.svg)  
+**Let's Encrypt**, kar amacı gütmeyen bir _sertifika otoritesidir_. Let's Encrypt sayesinde ücretsiz olarak SSL/TLS sertifikası edinebilirsiniz.
+
+SSL/TLS sertifikaları, normalde ortak olarak kabul edilmiş bilinen sertifika otoriteleri tarafından belirli bir ücret karşılığında edinilebilirdi. Let's Encrypt, SSL/TLS sertifikalarını herkes için erişilebilir hale getirmiştir. 2020 Şubat ayı itibarıyla, Let's Encrypt **1 milyar** sertifika dağıtmıştır. Firefox istatistiklerine göre, Let's Encrypt'ten önce erişilen web sitelerinin yalnızca %26'sı SSL/TLS sertifikasına sahipken, bugün bu oran %85'e ulaşmıştır. [^1]
+
+## Let's Encrypt ile SSL/TLS sertifikası almak
+
+Let's Encrypt ile sertifika edinmek için, [EFF](https://eff.org) tarafından geliştirilen [CertBot](https://certbot.eff.org) aracını kullanabilirsiniz. 
+
+CertBot, sertifikanızı otomatik olarak oluşturup gereken web sunucunuza kuracaktır.
+
+Öncelikle <https://certbot.eff.org> adresine girip, alt kısımda bulunan menüden web sunucunuzu ve kullandığınız işletim sistemini/dağıtımı seçin.
+
+**Not:** _Bu noktadan itibaren, Ubuntu üzerinde Nginx kullandığınız varsayılacaktır._
+
+![CertBot menü](certbot.png)
+
+Daha sonra gelen sayfadaki yönergeleri takip edebilirsiniz. 
+
+Sunucunuza SSH ile bağlandıktan sonra, sırasıyla aşağıdaki komutları çalıştırın:
+
+```
+sudo apt-get update
+sudo apt-get install software-properties-common
+sudo add-apt-repository universe
+sudo apt-get update
+sudo apt-get install certbot python3-certbot-nginx
+```
+
+Certbot sisteminize kurulacaktır. Nginx üzerindeki web sitenizin yapılandırmasında, `server_name`'inizin doğru ayarlandığına emin olun. Ayrıca, alan adınızın A kaydının Certbot'u çalıştırdığınız sunucuya yönlenmiş olduğuna emin olun.
+
+Daha sonra aşağıdaki komut ile Certbot'u çalıştırın:
+
+`sudo certbot --nginx`
+
+Certbot, size bir e-posta adresi soracaktır. Bu e-posta adresine, yenilenemeyen sertifikalarınızla ilgili bilgilendirmeler gönderilecektir. E-postanızı yazdıktan sonra, EFF bültenini almak isteyip istemediğiniz sorulacaktır, tercihinize göre cevaplayıp devam ettiğinizde Nginx yapılandırma dosyalarınızda bulunan alan adlarınız listelenecektir. 
+
+Bir sertifikaya, birden fazla alan adı tanımlanabilmektedir. Ama bu noktada, alan adlarınızdan herhangi birisi eğer düşerse, sertifikanızın yenilenmeyeceğini unutmayın. Dolayısıyla sadece alt alan adlarını tek sertifikada toplamanız tavsiye edilmektedir.
+
+Çıkan listedeki alan adlarının numaralarını virgülle ayırarak yazın, sertifikanız oluşturulacaktır.
+
+Bu noktada, alan adınızın varsayılan olarak HTTPS'e yönlendirmek isteyip istemediğinizi soracaktır. Özel bir sebebiniz yoksa, `2` yazarak yönlendirme yapmanız şiddetle tavsiye edilir.
+
+Tüm bu adımları tamamladığınızda, SSL/TLS sertifikanız oluşturulmuş olacak. Web tarayıcınıza <https://alanadiniz.tld> girerek sertifikanızın çalışıp çalışmadığını doğrulayabilirsiniz.
+
+Sertifikanız 90 gün süreyle verilir ve Certbot tarafından otomatik olarak yenilenir. Tebrik ederiz!
+ 
+[^1]: https://letsencrypt.org/stats/

src/ag_guvenligi/letsencrypt.svg

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src/credits.md

@@ -0,0 +1,27 @@
+# Katkıda Bulunanlar ve Lisans
+
+## Katkıda bulunanlar
+
+* Filiz Akın
+* Uğur Arıcı
+* Alper Atmaca
+* Tan Aytekin
+* Murat Emir Cabaroğlu
+* Onur Çelik
+* Cemre Demircioğlu
+* Mert Gör
+* Hamdi Gümüş
+* Derya Karaarslan
+* Umut Karcı
+* Özcan Oğuz
+* Osman Orçun Serçe
+* Zeynep Topsakal
+* Neslihan Turan
+* Yasin İsa Yıldırım
+* Mustafa Yontar
+
+## Lisans
+
+© 2019-2020 Özgür Yazılım Derneği ve katkıda bulunanlar
+
+<a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/"><img alt="Creative Commons Lisansı" style="border-width:0" src="https://i.creativecommons.org/l/by-sa/4.0/88x31.png" /></a><br />Bu eser <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/"> Creative Commons Atıf-AynıLisanslaPaylaş 4.0 Uluslararası Lisansı</a> ile lisanslanmıştır.