- writing all intermediate ca certificates to a file and passing file path for...

- writing all intermediate ca certificates to a file and passing file path for kubernetes connection

app/models/clusters/platforms/kubernetes.rb

@@ -159,7 +159,16 @@ module Clusters
 
         if ca_pem.present?
           opts[:cert_store] = OpenSSL::X509::Store.new
-          opts[:cert_store].add_cert(OpenSSL::X509::Certificate.new(ca_pem))
+
+          file = Tempfile.new('cluster_ca_pem_temp')
+          begin
+            file.write(ca_pem)
+            file.rewind
+            opts[:cert_store].add_file(file.path)
+          ensure
+            file.close
+            file.unlink # deletes the temp file
+          end
         end
 
         opts

changelogs/unreleased/patch-109.yml

+---
+title: Fixed issue (#198424) that prevented k8s authentication with intermediate certificates
+merge_request: 31254
+author: Abdelrahman Mohamed
+type: fixed

spec/fixtures/clusters/ca_certificate.pem

+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

spec/fixtures/clusters/chain_certificates.pem

+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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spec/fixtures/clusters/intermediate_certificate.pem

+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

spec/fixtures/clusters/root_certificate.pem

+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

spec/models/clusters/platforms/kubernetes_spec.rb

@@ -204,6 +204,52 @@ RSpec.describe Clusters::Platforms::Kubernetes do
     end
 
     it { is_expected.to be_an_instance_of(Gitlab::Kubernetes::KubeClient) }
+
+    context 'ca_pem is a single certificate' do
+      let(:ca_pem) { File.read(Rails.root.join('spec/fixtures/clusters/ca_certificate.pem')) }
+      let(:kubernetes) do
+        build(:cluster_platform_kubernetes,
+              :configured,
+              namespace: 'a-namespace',
+              cluster: cluster,
+              ca_pem: ca_pem)
+      end
+
+      it 'adds it to cert_store' do
+        cert = OpenSSL::X509::Certificate.new(ca_pem)
+        cert_store = kubernetes.kubeclient.kubeclient_options[:ssl_options][:cert_store]
+
+        expect(cert_store.verify(cert)).to be true
+      end
+    end
+
+    context 'ca_pem is a chain' do
+      let(:cert_chain) { File.read(Rails.root.join('spec/fixtures/clusters/chain_certificates.pem')) }
+      let(:kubernetes) do
+        build(:cluster_platform_kubernetes,
+              :configured,
+              namespace: 'a-namespace',
+              cluster: cluster,
+              ca_pem: cert_chain)
+      end
+
+      it 'includes chain of certificates' do
+        cert1_file = File.read(Rails.root.join('spec/fixtures/clusters/root_certificate.pem'))
+        cert1 = OpenSSL::X509::Certificate.new(cert1_file)
+
+        cert2_file = File.read(Rails.root.join('spec/fixtures/clusters/intermediate_certificate.pem'))
+        cert2 = OpenSSL::X509::Certificate.new(cert2_file)
+
+        cert3_file = File.read(Rails.root.join('spec/fixtures/clusters/ca_certificate.pem'))
+        cert3 = OpenSSL::X509::Certificate.new(cert3_file)
+
+        cert_store = kubernetes.kubeclient.kubeclient_options[:ssl_options][:cert_store]
+
+        expect(cert_store.verify(cert1)).to be true
+        expect(cert_store.verify(cert2)).to be true
+        expect(cert_store.verify(cert3)).to be true
+      end
+    end
   end
 
   describe '#rbac?' do