From f318327952d8ef1688b3e1e9c78d28a56e2364cc Mon Sep 17 00:00:00 2001
From: neru <neru@neru.rip>
Date: Wed, 13 May 2026 11:19:45 -0300
Subject: [PATCH] fix: check for already existing cert

---
 src/proxy/tinymitm/ssl.cpp | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/proxy/tinymitm/ssl.cpp b/src/proxy/tinymitm/ssl.cpp
index fd9d633..8cf3406 100644
--- a/src/proxy/tinymitm/ssl.cpp
+++ b/src/proxy/tinymitm/ssl.cpp
@@ -103,7 +103,17 @@ bool CertificateManager::installCertificate()
     bool success = false;
     if (rootStore)
     {
-        success = CertAddCertificateContextToStore(rootStore, certCtx, CERT_STORE_ADD_REPLACE_EXISTING, NULL);
+        PCCERT_CONTEXT existingCert = CertFindCertificateInStore(rootStore, X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, 0,
+                                                                 CERT_FIND_EXISTING, certCtx, NULL);
+        if (existingCert)
+        {
+            CertFreeCertificateContext(existingCert);
+            success = true;
+        }
+        else
+        {
+            success = CertAddCertificateContextToStore(rootStore, certCtx, CERT_STORE_ADD_REPLACE_EXISTING, NULL);
+        }
         CertCloseStore(rootStore, 0);
     }
     CertFreeCertificateContext(certCtx);