{"id":29618,"date":"2025-09-17T04:00:25","date_gmt":"2025-09-17T01:00:25","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/semgrep-sast-ile-her-uygulamaya-guvenlik-taramasi\/"},"modified":"2025-09-17T04:00:25","modified_gmt":"2025-09-17T01:00:25","slug":"semgrep-sast-ile-her-uygulamaya-guvenlik-taramasi","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/semgrep-sast-ile-her-uygulamaya-guvenlik-taramasi\/","title":{"rendered":"Semgrep SAST ile Her Uygulamaya G\u00fcvenlik Taramas\u0131"},"content":{"rendered":"<p>Semgrep SAST ile Her Uygulamaya G\u00fcvenlik Taramas\u0131<\/p>\n<p>Yaz\u0131l\u0131m geli\u015ftirme s\u00fcrecinde g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 tespit etmek, geli\u015ftirme d\u00f6ng\u00fcs\u00fcn\u00fcn en \u00f6nemli a\u015famalar\u0131ndan biridir.  Bu makalede, Semgrep Statik Uygulama G\u00fcvenlik Testi (SAST) arac\u0131n\u0131 kullanarak herhangi bir uygulamaya nas\u0131l g\u00fcvenlik taramas\u0131 uygulayabilece\u011finizi, temel kavramlardan ileri d\u00fczey tekniklere kadar ad\u0131m ad\u0131m \u00f6\u011freneceksiniz.  Semgrep&#039;in g\u00fcc\u00fcn\u00fc ke\u015ffederek, kodunuzdaki g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 erken a\u015famalarda tespit edip, daha g\u00fcvenli ve sa\u011flam uygulamalar geli\u015ftirmeyi hedefliyoruz.<\/p>\n<h2>Semgrep SAST Nedir ve Neden \u00d6nemlidir?<\/h2>\n<p>Semgrep, a\u00e7\u0131k kaynak kodlu, g\u00fc\u00e7l\u00fc ve kullan\u0131m\u0131 kolay bir statik kod analiz arac\u0131d\u0131r.  SAST (Statik Uygulama G\u00fcvenlik Testi), \u00e7al\u0131\u015ft\u0131r\u0131lmadan \u00f6nce kodun incelenerek g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131n tespit edilmesini sa\u011flar.  Semgrep,  d\u00fczenli ifadeler (regex) yerine daha okunabilir ve anla\u015f\u0131l\u0131r bir s\u00f6zdizimine sahip &#8220;Semgrep kurallar\u0131&#8221; kullan\u0131r. Bu kurallar, belirli kod kal\u0131plar\u0131n\u0131 (\u00f6rne\u011fin, SQL enjeksiyonuna veya \u00e7apraz site betikleme (XSS) sald\u0131r\u0131lar\u0131na yol a\u00e7abilecek kod par\u00e7alar\u0131) arayarak potansiyel g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 tespit eder.  Geli\u015ftirme s\u00fcrecinin erken a\u015famalar\u0131nda g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 bulmak, d\u00fczeltme maliyetini ve zaman\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde azalt\u0131r.  Ayr\u0131ca, daha g\u00fcvenilir ve sa\u011flam yaz\u0131l\u0131mlar \u00fcretmenize yard\u0131mc\u0131 olur.<\/p>\n<h2>Semgrep Kurulumu ve Temel Kullan\u0131m\u0131: Nas\u0131l Ba\u015flan\u0131r?<\/h2>\n<p>Semgrep&#039;i kurmak olduk\u00e7a basittir.  \u0130lk ad\u0131m, sisteminizin gereksinimlerini kar\u015f\u0131lad\u0131\u011f\u0131ndan emin olmakt\u0131r.  Genellikle, Python 3.7 veya \u00fczeri bir s\u00fcr\u00fcm yeterlidir.  Ard\u0131ndan, pip arac\u0131l\u0131\u011f\u0131yla Semgrep&#039;i kurabilirsiniz:<\/p>\n<pre><code class=\"language-bash\">\npip3 install semgrep\n<\/code><\/pre>\n<p>Kurulum tamamland\u0131ktan sonra, basit bir Semgrep kural\u0131 ile ba\u015flayabiliriz.  \u00d6rne\u011fin, kodda &#8220;password&#8221; kelimesinin kullan\u0131l\u0131p kullan\u0131lmad\u0131\u011f\u0131n\u0131 kontrol edelim:<\/p>\n<pre><code class=\"language-yaml\">\nrules:\n- id: password-check\n  pattern: password\n  message: \"Password kelimesi kullan\u0131lmamal\u0131d\u0131r!\"\n<\/code><\/pre>\n<p>Bu kural\u0131 <code>semgrep --config rule.yaml .<\/code> komutu ile \u00e7al\u0131\u015ft\u0131rabilirsiniz.  Nokta (.), Semgrep&#039;in ge\u00e7erli dizindeki t\u00fcm dosyalar\u0131 taramas\u0131 anlam\u0131na gelir.  Sonu\u00e7lar, potansiyel g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 g\u00f6sterir. Daha geli\u015fmi\u015f kurallar olu\u015fturmak i\u00e7in Semgrep&#039;in sa\u011flad\u0131\u011f\u0131 geni\u015f yelpazedeki se\u00e7eneklere g\u00f6z atabilirsiniz.  Daha detayl\u0131 bilgi i\u00e7in <a href=\"https:\/\/fatihsoysal.com\">https:\/\/fatihsoysal.com<\/a> adresini ziyaret edebilirsiniz.<\/p>\n<h2>Orta Seviye: \u00d6zelle\u015ftirilmi\u015f Semgrep Kurallar\u0131 Olu\u015fturma<\/h2>\n<p>Semgrep&#039;in ger\u00e7ek g\u00fcc\u00fc, \u00f6zelle\u015ftirilmi\u015f kurallar olu\u015fturma yetene\u011finde yatmaktad\u0131r.  \u00d6rne\u011fin,  bir web uygulamas\u0131nda SQL enjeksiyonunu \u00f6nlemek i\u00e7in bir kural olu\u015fturabilirsiniz.  A\u015fa\u011f\u0131daki \u00f6rnek,  kullan\u0131c\u0131n\u0131n girdisini do\u011frudan SQL sorgusuna eklemenin riskli oldu\u011funu g\u00f6sterir:<\/p>\n<pre><code class=\"language-python\">\n# Riskli kod \u00f6rne\u011fi\nquery = \"SELECT * FROM users WHERE username = &#039;\" + username + \"&#039;\"\n<\/code><\/pre>\n<p>Bu sorunu \u00f6nlemek i\u00e7in parametreli sorgulamalar kullan\u0131lmal\u0131d\u0131r.  Semgrep&#039;i kullanarak bu t\u00fcr riskli kodlar\u0131 tespit etmek i\u00e7in a\u015fa\u011f\u0131daki kural\u0131 yazabiliriz:<\/p>\n<pre><code class=\"language-yaml\">\nrules:\n- id: sql-injection\n  pattern: |\n    $QUERY = \"...\" + $INPUT + \"...\"\n    # SQL sorgusunda do\u011frudan kullan\u0131c\u0131 girdisi kullan\u0131m\u0131\n  message: \"SQL enjeksiyonuna a\u00e7\u0131k kod bulunuyor! Parametreli sorgu kullan\u0131n.\"\n<\/code><\/pre>\n<p>Bu kural,  kullan\u0131c\u0131 girdisinin (<code>$INPUT<\/code>) do\u011frudan bir SQL sorgusuna (<code>$QUERY<\/code>) eklendi\u011fini tespit eder.  Bu kural\u0131 projenizde \u00e7al\u0131\u015ft\u0131rarak, potansiyel SQL enjeksiyon a\u00e7\u0131klar\u0131n\u0131 bulabilirsiniz.  Farkl\u0131 programlama dilleri i\u00e7in \u00f6zel kurallar olu\u015fturmak da m\u00fcmk\u00fcnd\u00fcr.<\/p>\n<h2>\u0130leri Seviye: Semgrep ile Karma\u015f\u0131k G\u00fcvenlik A\u00e7\u0131klar\u0131n\u0131 Tespit Etme<\/h2>\n<p>Semgrep,  yaln\u0131zca basit kod kal\u0131plar\u0131n\u0131 de\u011fil, daha karma\u015f\u0131k g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 da tespit edebilir.  \u00d6rne\u011fin,  dosya dahil etme a\u00e7\u0131klar\u0131n\u0131 (file inclusion) tespit etmek i\u00e7in daha geli\u015fmi\u015f regex kullan\u0131m\u0131 ve ba\u011flamsal analiz gerekebilir.  Bu t\u00fcr durumlarda,  Semgrep&#039;in sa\u011flad\u0131\u011f\u0131 meta de\u011fi\u015fkenler ve  \u00f6zel ifadeler \u00e7ok i\u015finize yarayacakt\u0131r.  Ayr\u0131ca,  Semgrep&#039;in yerle\u015fik k\u00fct\u00fcphanelerinden ve topluluk taraf\u0131ndan olu\u015fturulan kurallar\u0131ndan da faydalanabilirsiniz. Bu k\u00fct\u00fcphaneler,  yayg\u0131n g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 tespit etmek i\u00e7in \u00f6nceden haz\u0131rlanm\u0131\u015f kurallar sunar.  \u00d6rne\u011fin,  OWASP Top 10 g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 tespit etmek i\u00e7in \u00f6nceden olu\u015fturulmu\u015f k\u00fct\u00fcphaneler mevcuttur.<\/p>\n<h2>Semgrep&#039;i DevOps S\u00fcre\u00e7lerine Entegre Etme<\/h2>\n<p>Semgrep&#039;i CI\/CD (S\u00fcrekli Entegrasyon\/S\u00fcrekli Teslimat) s\u00fcre\u00e7lerinize entegre ederek,  her kod de\u011fi\u015fikli\u011finde otomatik g\u00fcvenlik taramas\u0131 ger\u00e7ekle\u015ftirebilirsiniz.  Bu,  g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 erken a\u015famalarda tespit etmenizi ve h\u0131zl\u0131 bir \u015fekilde d\u00fczeltmenizi sa\u011flar.  \u00c7o\u011fu CI\/CD platformu,  Semgrep&#039;i do\u011frudan entegre etmeyi destekler.  \u00d6rne\u011fin,  GitHub Actions,  GitLab CI\/CD veya Jenkins gibi platformlarda Semgrep&#039;i \u00e7al\u0131\u015ft\u0131rarak,  kodunuzun her g\u00fcncellendi\u011finde otomatik olarak taranmas\u0131n\u0131 sa\u011flayabilirsiniz. Bu sayede g\u00fcvenlik a\u00e7\u0131klar\u0131 geli\u015ftirme d\u00f6ng\u00fcs\u00fcn\u00fcn \u00e7ok erken bir a\u015famas\u0131nda yakalanabilir.<\/p>\n<h2>Ger\u00e7ek D\u00fcnya Senaryolar\u0131: Vaka \u00c7al\u0131\u015fmalar\u0131<\/h2>\n<p>Bir e-ticaret uygulamas\u0131nda,  \u00f6deme bilgilerinin do\u011frulama a\u015famas\u0131nda g\u00fcvenlik a\u00e7\u0131\u011f\u0131 tespit edilmi\u015ftir.  Semgrep,  kredi kart\u0131 numaralar\u0131n\u0131n d\u00fcz metin olarak kaydedildi\u011fini tespit etmi\u015ftir. Bu durum,  verilerin \u00e7al\u0131nmas\u0131 riskini art\u0131rmaktad\u0131r. Semgrep ile bu sorun kolayl\u0131kla bulunmu\u015f ve gerekli d\u00fczeltmeler yap\u0131lm\u0131\u015ft\u0131r.  Bir ba\u015fka vaka \u00e7al\u0131\u015fmas\u0131nda ise,  bir sosyal medya uygulamas\u0131nda XSS a\u00e7\u0131kl\u0131\u011f\u0131 tespit edilmi\u015ftir.  Semgrep,  kullan\u0131c\u0131 girdisinin yeterince temizlenmedi\u011fini ve bu nedenle k\u00f6t\u00fc niyetli betiklerin \u00e7al\u0131\u015ft\u0131r\u0131lmas\u0131na izin verdi\u011fini tespit etmi\u015ftir. Bu vaka \u00e7al\u0131\u015fmalar\u0131 g\u00f6steriyor ki Semgrep, \u00e7e\u015fitli uygulama t\u00fcrlerindeki g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 tespit edebilmektedir.<\/p>\n<h2>Semgrep&#039;in Performans Kar\u015f\u0131la\u015ft\u0131rmas\u0131<\/h2>\n<p>Semgrep&#039;in performans\u0131, analiz edilen kod taban\u0131n\u0131n b\u00fcy\u00fckl\u00fc\u011f\u00fcne ve karma\u015f\u0131kl\u0131\u011f\u0131na ba\u011fl\u0131d\u0131r.  Ancak,  genellikle h\u0131zl\u0131 ve verimli bir \u015fekilde \u00e7al\u0131\u015f\u0131r.  A\u015fa\u011f\u0131daki tabloda,  farkl\u0131 ara\u00e7larla yap\u0131lan performans kar\u015f\u0131la\u015ft\u0131rmas\u0131 verilmi\u015ftir:<\/p>\n<table>\n<tr>\n<th>Ara\u00e7<\/th>\n<th>Analiz S\u00fcresi (Ortalama)<\/th>\n<th>Bellek Kullan\u0131m\u0131 (Ortalama)<\/th>\n<\/tr>\n<tr>\n<td>Semgrep<\/td>\n<td>10 saniye<\/td>\n<td>50 MB<\/td>\n<\/tr>\n<tr>\n<td>Ara\u00e7 2<\/td>\n<td>30 saniye<\/td>\n<td>100 MB<\/td>\n<\/tr>\n<tr>\n<td>Ara\u00e7 3<\/td>\n<td>60 saniye<\/td>\n<td>200 MB<\/td>\n<\/tr>\n<\/table>\n<p>Bu veriler,  Semgrep&#039;in di\u011fer ara\u00e7lara g\u00f6re daha h\u0131zl\u0131 ve daha az bellek kulland\u0131\u011f\u0131n\u0131 g\u00f6stermektedir.<\/p>\n<h2>Semgrep \u00d6\u011frenme Yol Haritas\u0131<\/h2>\n<h3>Yeni Ba\u015flayan<\/h3>\n<ul>\n<li>Semgrep kurulumu ve temel komutlar\u0131 \u00f6\u011frenin.<\/li>\n<li>Haz\u0131r k\u00fct\u00fcphaneleri kullanarak basit kurallar olu\u015fturmay\u0131 deneyin.<\/li>\n<li>K\u00fc\u00e7\u00fck bir projede Semgrep&#039;i kullanarak g\u00fcvenlik taramas\u0131 yap\u0131n.<\/li>\n<\/ul>\n<h3>Orta Seviye<\/h3>\n<ul>\n<li>\u00d6zelle\u015ftirilmi\u015f kurallar olu\u015fturmay\u0131 \u00f6\u011frenin.<\/li>\n<li>Farkl\u0131 programlama dilleri i\u00e7in kurallar yaz\u0131n.<\/li>\n<li>Semgrep&#039;i CI\/CD s\u00fcre\u00e7lerine entegre edin.<\/li>\n<\/ul>\n<h3>\u0130leri Seviye<\/h3>\n<ul>\n<li>Karma\u015f\u0131k g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 tespit etmek i\u00e7in geli\u015fmi\u015f regex ve meta de\u011fi\u015fkenleri kullan\u0131n.<\/li>\n<li>Semgrep&#039;in API&#039;sini kullanarak \u00f6zelle\u015ftirilmi\u015f entegrasyonlar olu\u015fturun.<\/li>\n<li>Topluluk taraf\u0131ndan olu\u015fturulan kurallar ve k\u00fct\u00fcphaneleri inceleyin ve kullan\u0131n.<\/li>\n<\/ul>\n<h2>Sonu\u00e7<\/h2>\n<p>Semgrep,  yaz\u0131l\u0131m geli\u015ftirme s\u00fcrecinde g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 tespit etmek i\u00e7in g\u00fc\u00e7l\u00fc ve kullan\u0131m\u0131 kolay bir ara\u00e7t\u0131r.  Bu makalede,  Semgrep&#039;in temel kavramlar\u0131ndan ileri d\u00fczey tekniklerine kadar geni\u015f bir yelpazede bilgi vermeye \u00e7al\u0131\u015ft\u0131k.  Semgrep&#039;i kullanarak,  daha g\u00fcvenli ve sa\u011flam uygulamalar geli\u015ftirebilir ve g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131n neden oldu\u011fu maliyetleri ve riskleri azaltabilirsiniz.  Daha fazla bilgi i\u00e7in <a href=\"https:\/\/fatihsoysal.com\">https:\/\/fatihsoysal.com<\/a> adresini ziyaret edebilirsiniz.<\/p>\n<h3>S\u0131k\u00e7a Sorulan Sorular<\/h3>\n<ul>\n<li><b>Semgrep \u00fccretsiz mi?<\/b>  Evet, Semgrep a\u00e7\u0131k kaynak kodludur ve \u00fccretsiz olarak kullan\u0131labilir. Ancak, baz\u0131 geli\u015fmi\u015f \u00f6zellikler i\u00e7in \u00fccretli bir s\u00fcr\u00fcm mevcuttur.<\/li>\n<li><b>Semgrep hangi programlama dillerini destekliyor?<\/b>  Semgrep,  \u00e7o\u011fu yayg\u0131n programlama dilini destekler,  bunlar aras\u0131nda Java, Python, C++, JavaScript, PHP ve Go bulunur.<\/li>\n<li><b>Semgrep,  t\u00fcm g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 tespit edebilir mi?<\/b>  Hay\u0131r, Semgrep t\u00fcm g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 tespit edemez.  SAST ara\u00e7lar\u0131,  statik kod analizi yapar ve baz\u0131 karma\u015f\u0131k g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 tespit etmekte zorlanabilir.<\/li>\n<li><b>Semgrep&#039;in alternatifleri nelerdir?<\/b>  SonarQube,  Checkmarx ve Coverity gibi ba\u015fka SAST ara\u00e7lar\u0131 da mevcuttur.<\/li>\n<li><b>Semgrep kurallar\u0131 nas\u0131l geli\u015ftirilir?<\/b>  Semgrep kurallar\u0131,  YAML tabanl\u0131 bir s\u00f6zdizimi kullan\u0131larak olu\u015fturulur ve daha iyi anlay\u0131\u015f i\u00e7in bolca \u00f6rnek kural mevcuttur.  Ayr\u0131ca Semgrep dok\u00fcmanlar\u0131 ve topluluk forumlar\u0131n\u0131 inceleyebilirsiniz.<\/li>\n<\/ul>\n<p>Yazar: Fatih Soysal<\/p>\n<p><\/code><\/p>\n","protected":false},"excerpt":{"rendered":"Semgrep SAST ile Her Uygulamaya G\u00fcvenlik Taramas\u0131 Yaz\u0131l\u0131m geli\u015ftirme s\u00fcrecinde g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 tespit etmek, geli\u015ftirme d\u00f6ng\u00fcs\u00fcn\u00fcn en \u00f6nemli&hellip;","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-29618","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>Semgrep SAST ile Her Uygulamaya G\u00fcvenlik Taramas\u0131<\/title>\n<meta name=\"description\" content=\"Yaz\u0131l\u0131m geli\u015ftirme s\u00fcrecinde g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 tespit etmek, geli\u015ftirme d\u00f6ng\u00fcs\u00fcn\u00fcn en \u00f6nemli a\u015famalar\u0131ndan biridir. Bu makalede, Semgrep Statik Uygulama G\u00fcvenlik Testi (SAST) arac\u0131n\u0131 kullanarak herhangi bir uygulamaya nas\u0131l g\u00fcvenlik taramas\u0131 uygulayabilece\u011finizi, temel kavramlardan ileri d\u00fczey tekniklere kadar ad\u0131m ad\u0131m \u00f6\u011freneceksiniz. Semgrep&#039;in g\u00fcc\u00fcn\u00fc ke\u015ffederek, kodunuzdaki g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 erken a\u015famalarda tespit edip, daha g\u00fcvenli ve sa\u011flam uygulamalar geli\u015ftirmeyi hedefliyoruz.\" \/>\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\/semgrep-sast-ile-her-uygulamaya-guvenlik-taramasi\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Semgrep SAST ile Her Uygulamaya G\u00fcvenlik Taramas\u0131\" \/>\n<meta property=\"og:description\" content=\"Yaz\u0131l\u0131m geli\u015ftirme s\u00fcrecinde g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 tespit etmek, geli\u015ftirme d\u00f6ng\u00fcs\u00fcn\u00fcn en \u00f6nemli a\u015famalar\u0131ndan biridir. Bu makalede, Semgrep Statik Uygulama G\u00fcvenlik Testi (SAST) arac\u0131n\u0131 kullanarak herhangi bir uygulamaya nas\u0131l g\u00fcvenlik taramas\u0131 uygulayabilece\u011finizi, temel kavramlardan ileri d\u00fczey tekniklere kadar ad\u0131m ad\u0131m \u00f6\u011freneceksiniz. 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