feat: handle x509 certs in HTTP Client (#99)

Gemfile

@@ -2,3 +2,10 @@ source 'https://rubygems.org'
 
 # Specify your gem's dependencies in pact.gemspec
 gemspec
+
+group :test do
+  gem 'faraday', '~> 2.0'
+  gem 'faraday-retry', '~> 2.0'
+  gem 'webrick', '~> 1.8'
+  gem 'rack', '~> 2.2'
+end

lib/pact/consumer_contract/pact_file.rb

@@ -109,6 +109,12 @@ def prepare_request(uri, options)
       http.ca_file = ENV['SSL_CERT_FILE'] if ENV['SSL_CERT_FILE'] && ENV['SSL_CERT_FILE'] != ''
       http.ca_path = ENV['SSL_CERT_DIR'] if ENV['SSL_CERT_DIR'] && ENV['SSL_CERT_DIR'] != ''
       http.set_debug_output(Pact::Http::AuthorizationHeaderRedactor.new(Pact.configuration.output_stream)) if verbose?(options)
+
+      if x509_certificate?
+        http.cert = OpenSSL::X509::Certificate.new(x509_client_cert_file)
+        http.key = OpenSSL::PKey::RSA.new(x509_client_key_file)
+      end
+
       if disable_ssl_verification?
         if verbose?(options)
           Pact.configuration.output_stream.puts("SSL verification is disabled")
@@ -150,6 +156,19 @@ def verbose?(options)
       options[:verbose] || ENV['VERBOSE'] == 'true'
     end
 
+    def x509_certificate?
+      ENV['X509_CLIENT_CERT_FILE'] && ENV['X509_CLIENT_CERT_FILE'] != '' &&
+        ENV['X509_CLIENT_KEY_FILE'] && ENV['X509_CLIENT_KEY_FILE'] != ''
+    end
+
+    def x509_client_cert_file
+      File.read(ENV['X509_CLIENT_CERT_FILE'])
+    end
+
+    def x509_client_key_file
+      File.read(ENV['X509_CLIENT_KEY_FILE'])
+    end
+
     def disable_ssl_verification?
       ENV['PACT_DISABLE_SSL_VERIFICATION'] == 'true' || ENV['PACT_BROKER_DISABLE_SSL_VERIFICATION'] == 'true'
     end

spec/fixtures/certificates/ca_cert.pem

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

spec/fixtures/certificates/ca_cert.srl

@@ -0,0 +1 @@
+494F82D5FE5055D2C9C64941C421085B59521071

spec/fixtures/certificates/ca_key.pem

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----

spec/fixtures/certificates/client_cert.pem

@@ -0,0 +1,17 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

spec/fixtures/certificates/key.pem

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----

spec/fixtures/certificates/server.csr

@@ -0,0 +1,15 @@
+-----BEGIN CERTIFICATE REQUEST-----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+-----END CERTIFICATE REQUEST-----

spec/fixtures/certificates/unsigned_cert.pem

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

spec/fixtures/certificates/unsigned_key.pem

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----

spec/lib/pact/consumer_contract/pact_file_spec.rb

@@ -2,6 +2,8 @@
 require 'tempfile'
 require 'pact/consumer_contract/pact_file'
 require 'base64' # XXX: https://github.com/bblimke/webmock/pull/611
+require "faraday"
+require "faraday/retry"
 
 module Pact
   describe PactFile do
@@ -212,6 +214,80 @@ def render_pact(options = {})
           end
         end
       end
+
+      describe "x509 certificate" do
+        FAKE_SERVER_URL = 'https://localhost:4444'
+        X509_CERT_FILE_PATH = './spec/fixtures/certificates/client_cert.pem'
+        X509_KEY_FILE_PATH = './spec/fixtures/certificates/key.pem'
+        UNSIGNED_X509_CERT_FILE_PATH = './spec/fixtures/certificates/unsigned_cert.pem'
+        UNSIGNED_X509_KEY_FILE_PATH = './spec/fixtures/certificates/unsigned_key.pem'
+
+        def wait_for_server_to_start
+          Faraday.new(
+            url: FAKE_SERVER_URL,
+            ssl: {
+              verify: false,
+              client_cert: OpenSSL::X509::Certificate.new(File.read(X509_CERT_FILE_PATH)),
+              client_key: OpenSSL::PKey::RSA.new(File.read(X509_KEY_FILE_PATH))
+            }
+          ) do |builder|
+            builder.request :retry, max: 20, interval: 0.5, exceptions: [StandardError]
+            builder.adapter :net_http
+          end.get
+        end
+
+        let(:render_pact) { PactFile.render_pact(FAKE_SERVER_URL, {}) }
+
+        before(:all) do
+          @pipe = IO.popen("bundle exec ruby ./spec/support/ssl_server.rb")
+          ENV['SSL_CERT_FILE'] = "./spec/fixtures/certificates/ca_cert.pem"
+
+          wait_for_server_to_start()
+        end
+
+        context "with valid x509 client certificates" do
+          before do
+            ENV['X509_CLIENT_CERT_FILE'] = X509_CERT_FILE_PATH
+            ENV['X509_CLIENT_KEY_FILE'] = X509_KEY_FILE_PATH
+          end
+
+          it "succeeds" do
+            expect(render_pact).to eq("Fake SSL server\n")
+          end
+        end
+
+        context "when invalid x509 certificates are set" do
+          before do
+            ENV['X509_CLIENT_CERT_FILE'] = UNSIGNED_X509_CERT_FILE_PATH
+            ENV['X509_CLIENT_KEY_FILE'] = UNSIGNED_X509_KEY_FILE_PATH
+          end
+
+          it "fails raising SSL error" do
+            expect { render_pact }
+              .to raise_error { |error|
+                expect([OpenSSL::SSL::SSLError, Errno::ECONNRESET]).to include(error.class)
+              }
+          end
+        end
+
+        context "when no x509 certificates are set" do
+          before do
+            ENV['X509_CLIENT_CERT_FILE'] = nil
+            ENV['X509_CLIENT_KEY_FILE'] = nil
+          end
+
+          it "fails raising SSL error" do
+            expect { render_pact }
+              .to raise_error { |error|
+                expect([OpenSSL::SSL::SSLError, Errno::ECONNRESET]).to include(error.class)
+              }
+          end
+        end
+
+        after(:all) do
+          Process.kill "KILL", @pipe.pid
+        end
+      end
     end
   end
 end

spec/support/ssl_server.rb

@@ -0,0 +1,42 @@
+if __FILE__ == $0
+
+  SSL_KEY = "spec/fixtures/certificates/key.pem"
+  SSL_CERT = "spec/fixtures/certificates/client_cert.pem"
+  SSL_CA_CERT = "spec/fixtures/certificates/ca_cert.pem"
+
+  trap(:INT) do
+    @server.shutdown
+    exit
+  end
+
+  def webrick_opts port
+    certificate = OpenSSL::X509::Certificate.new(File.read(SSL_CERT))
+    cert_name = certificate.subject.to_a.collect{|a| a[0..1] }
+    logger_stream = ENV["DEBUG"] ? $stderr : StringIO.new
+    {
+      Port: port,
+      Host: "0.0.0.0",
+      AccessLog: [],
+      Logger: WEBrick::Log.new(logger_stream,WEBrick::Log::INFO),
+      SSLVerifyClient: OpenSSL::SSL::VERIFY_FAIL_IF_NO_PEER_CERT | OpenSSL::SSL::VERIFY_PEER,
+      SSLCACertificateFile: SSL_CA_CERT,
+      SSLCertificate: certificate,
+      SSLPrivateKey: OpenSSL::PKey::RSA.new(File.read(SSL_KEY)),
+      SSLEnable: true,
+      SSLCertName: cert_name,
+    }
+  end
+
+  app = ->(_env) { puts "hello"; [200, {}, ["Fake SSL server" + "\n"]] }
+
+  require "webrick"
+  require "webrick/https"
+  require "rack"
+  require "rack/handler/webrick"
+
+  opts = webrick_opts(4444)
+
+  Rack::Handler::WEBrick.run(app, **opts) do |server|
+    @server = server
+  end
+end