add unit test for proxy cert validation

Author: maelv-filigran

tests/01-unit/api/__init__.py

@@ -0,0 +1 @@
+# Unit tests for API client functionality

tests/01-unit/api/test_opencti_api_client-proxy.py

@@ -0,0 +1,195 @@
+import os
+import tempfile
+from unittest.mock import patch, MagicMock, mock_open
+import pytest
+from pycti import OpenCTIApiClient
+
+
+class TestOpenCTIApiClient:
+    """Test OpenCTIApiClient certificate handling functionality."""
+
+    SAMPLE_CERTIFICATE = """-----BEGIN CERTIFICATE-----
+MIIDXTCCAkWgAwIBAgIJAKLdQVPy90WjMA0GCSqGSIb3DQEBCwUAMEUxCzAJBgNV
+BAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEwHwYDVQQKDBhJbnRlcm5ldCBX
+aWRnaXRzIFB0eSBMdGQwHhcNMjQwMTAxMDAwMDAwWhcNMjUwMTAxMDAwMDAwWjBF
+MQswCQYDVQQGEwJBVTETMBEGA1UECAwKU29tZS1TdGF0ZTEhMB8GA1UECgwYSW50
+ZXJuZXQgV2lkZ2l0cyBQdHkgTHRkMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIB
+CgKCAQEA0Z3VS5JJcds3xfn/ygWyF0qJDr9oYRH/9dMfqHCOq45DqMVJLJBJnMzN
+-----END CERTIFICATE-----"""
+
+    INVALID_CONTENT = "This is not a certificate"
+
+    @pytest.fixture
+    def api_client(self):
+        """Create an API client instance without performing health check."""
+        with patch.object(OpenCTIApiClient, '_setup_proxy_certificates'):
+            client = OpenCTIApiClient(
+                url="http://localhost:4000",
+                token="test-token",
+                ssl_verify=False,
+                perform_health_check=False
+            )
+            # Mock the logger
+            client.app_logger = MagicMock()
+            return client
+
+    def test_get_certificate_content_inline_pem(self, api_client):
+        """Test _get_certificate_content with inline PEM certificate."""
+        result = api_client._get_certificate_content(self.SAMPLE_CERTIFICATE)
+        
+        assert result == self.SAMPLE_CERTIFICATE
+        api_client.app_logger.debug.assert_called_with(
+            "HTTPS_CA_CERTIFICATES contains inline certificate content"
+        )
+
+    def test_get_certificate_content_file_path(self, api_client):
+        """Test _get_certificate_content with a file path containing certificate."""
+        # Create a temporary file with certificate content
+        with tempfile.NamedTemporaryFile(mode='w', suffix='.crt', delete=False) as cert_file:
+            cert_file.write(self.SAMPLE_CERTIFICATE)
+            cert_file_path = cert_file.name
+
+        try:
+            result = api_client._get_certificate_content(cert_file_path)
+            
+            assert result == self.SAMPLE_CERTIFICATE
+            api_client.app_logger.debug.assert_called_with(
+                "HTTPS_CA_CERTIFICATES contains valid certificate file path",
+                {"file_path": cert_file_path}
+            )
+        finally:
+            # Clean up
+            os.unlink(cert_file_path)
+
+    def test_get_certificate_content_invalid_file_content(self, api_client):
+        """Test _get_certificate_content with a file containing invalid certificate."""
+        # Create a temporary file with invalid content
+        with tempfile.NamedTemporaryFile(mode='w', suffix='.txt', delete=False) as invalid_file:
+            invalid_file.write(self.INVALID_CONTENT)
+            invalid_file_path = invalid_file.name
+
+        try:
+            result = api_client._get_certificate_content(invalid_file_path)
+            
+            assert result is None
+            api_client.app_logger.warning.assert_called_with(
+                "File at HTTPS_CA_CERTIFICATES path does not contain valid certificate",
+                {"file_path": invalid_file_path}
+            )
+        finally:
+            # Clean up
+            os.unlink(invalid_file_path)
+
+    def test_get_certificate_content_nonexistent_file(self, api_client):
+        """Test _get_certificate_content with a nonexistent file path."""
+        nonexistent_path = "/tmp/nonexistent_certificate.crt"
+        
+        result = api_client._get_certificate_content(nonexistent_path)
+        
+        assert result is None
+
+    def test_get_certificate_content_invalid_content(self, api_client):
+        """Test _get_certificate_content with invalid content (not PEM, not file)."""
+        result = api_client._get_certificate_content(self.INVALID_CONTENT)
+        
+        assert result is None
+
+    def test_get_certificate_content_whitespace_handling(self, api_client):
+        """Test _get_certificate_content handles whitespace correctly."""
+        # Test with certificate content with leading/trailing whitespace
+        cert_with_whitespace = f"  \n{self.SAMPLE_CERTIFICATE}  \n"
+        result = api_client._get_certificate_content(cert_with_whitespace)
+        
+        assert result == cert_with_whitespace  # Should return as-is
+        api_client.app_logger.debug.assert_called_with(
+            "HTTPS_CA_CERTIFICATES contains inline certificate content"
+        )
+
+    def test_get_certificate_content_file_read_permission_error(self, api_client):
+        """Test _get_certificate_content when file exists but can't be read."""
+        # Create a temporary file
+        with tempfile.NamedTemporaryFile(mode='w', suffix='.crt', delete=False) as cert_file:
+            cert_file.write(self.SAMPLE_CERTIFICATE)
+            cert_file_path = cert_file.name
+
+        try:
+            # Make file unreadable (on Unix systems)
+            os.chmod(cert_file_path, 0o000)
+            
+            result = api_client._get_certificate_content(cert_file_path)
+            
+            assert result is None
+            # Check that warning was logged about failed read
+            assert any(
+                call[0][0] == "Failed to read certificate file" 
+                for call in api_client.app_logger.warning.call_args_list
+            )
+        finally:
+            # Restore permissions and clean up
+            os.chmod(cert_file_path, 0o644)
+            os.unlink(cert_file_path)
+
+    @patch.dict(os.environ, {"HTTPS_CA_CERTIFICATES": ""})
+    def test_setup_proxy_certificates_no_env(self, api_client):
+        """Test _setup_proxy_certificates when HTTPS_CA_CERTIFICATES is not set."""
+        api_client._setup_proxy_certificates()
+        
+        # Should return early without setting ssl_verify
+        assert not hasattr(api_client, 'ssl_verify') or api_client.ssl_verify is False
+
+    @patch.dict(os.environ, {})
+    def test_setup_proxy_certificates_env_not_present(self, api_client):
+        """Test _setup_proxy_certificates when HTTPS_CA_CERTIFICATES env var doesn't exist."""
+        api_client._setup_proxy_certificates()
+        
+        # Should return early without setting ssl_verify
+        assert not hasattr(api_client, 'ssl_verify') or api_client.ssl_verify is False
+
+    @patch('tempfile.mkdtemp')
+    @patch('os.path.isfile')
+    @patch('builtins.open', new_callable=mock_open)
+    @patch.dict(os.environ, {"HTTPS_CA_CERTIFICATES": "-----BEGIN CERTIFICATE-----\ntest\n-----END CERTIFICATE-----"})
+    def test_setup_proxy_certificates_with_inline_cert(self, mock_file, mock_isfile, mock_mkdtemp, api_client):
+        """Test _setup_proxy_certificates with inline certificate content."""
+        # Setup mocks
+        mock_mkdtemp.return_value = "/tmp/test_certs"
+        mock_isfile.side_effect = lambda path: path == "/etc/ssl/certs/ca-certificates.crt"
+        
+        # Mock system certificate content
+        system_cert_content = "-----BEGIN CERTIFICATE-----\nsystem\n-----END CERTIFICATE-----"
+        
+        def open_side_effect(path, mode='r'):
+            if path == "/etc/ssl/certs/ca-certificates.crt" and mode == 'r':
+                return mock_open(read_data=system_cert_content)()
+            return mock_file()
+        
+        with patch('builtins.open', side_effect=open_side_effect):
+            api_client._setup_proxy_certificates()
+        
+        # Verify proxy certificates were processed
+        api_client.app_logger.info.assert_called()
+
+    @patch('tempfile.mkdtemp')
+    @patch.dict(os.environ, {"HTTPS_CA_CERTIFICATES": "/path/to/cert.crt"})
+    def test_setup_proxy_certificates_with_invalid_path(self, mock_mkdtemp, api_client):
+        """Test _setup_proxy_certificates with invalid certificate file path."""
+        mock_mkdtemp.return_value = "/tmp/test_certs"
+        
+        # Mock _get_certificate_content to return None (invalid)
+        with patch.object(api_client, '_get_certificate_content', return_value=None):
+            api_client._setup_proxy_certificates()
+        
+        # Should log warning and return early
+        api_client.app_logger.warning.assert_called()
+        assert not hasattr(api_client, 'ssl_verify') or api_client.ssl_verify is False
+
+    def test_setup_proxy_certificates_exception_handling(self, api_client):
+        """Test _setup_proxy_certificates handles exceptions gracefully."""
+        with patch.dict(os.environ, {"HTTPS_CA_CERTIFICATES": self.SAMPLE_CERTIFICATE}):
+            with patch('tempfile.mkdtemp', side_effect=Exception("Mock error")):
+                api_client._setup_proxy_certificates()
+        
+        # Should log warning and continue
+        api_client.app_logger.warning.assert_called_with(
+            "Failed to setup proxy certificates", {"error": "Mock error"}
+        )