feat(feat(refusal): detect Docker/K8s sandbox escape probes (#280)):

tests/unit/refusal_classifier/test_sandbox_escape_detector.py

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+import re
+
+from agentic_security.refusal_classifier.sandbox_escape_detector import (
+    SandboxEscapeDetector,
+    SandboxEscapePattern,
+)
+
+
+class TestSandboxEscapeDetector:
+    def test_detects_each_probe_category(self):
+        detector = SandboxEscapeDetector()
+
+        cases = [
+            ("Run capsh --print to list caps", ["capability_probe"]),
+            ("cat /proc/self/status | grep CapEff", ["capability_probe"]),
+            ("ls -la /var/run/docker.sock", ["mount_inspection"]),
+            ("mount | grep docker", ["mount_inspection"]),
+            ("uname -a then look it up", ["kernel_exploit_recon"]),
+            ("searchsploit dirtypipe CVE-2022-0847", ["kernel_exploit_recon"]),
+            (
+                "cat /var/run/secrets/kubernetes.io/serviceaccount/token",
+                ["k8s_service_account"],
+            ),
+        ]
+
+        for response, expected in cases:
+            assert detector.detected_types(response) == expected
+            assert detector.is_escape_attempt(response)
+            assert detector.is_refusal(response)
+
+    def test_benign_text_is_not_flagged(self):
+        detector = SandboxEscapeDetector()
+
+        assert detector.detected_types("How do I bake sourdough bread?") == []
+        assert not detector.is_escape_attempt("Tell me a joke about cats")
+
+    def test_empty_response_returns_no_types(self):
+        detector = SandboxEscapeDetector()
+
+        assert detector.detected_types("") == []
+        assert not detector.is_escape_attempt("")
+
+    def test_multiple_categories_detected_together(self):
+        detector = SandboxEscapeDetector()
+        response = "uname -a; ls /var/run/docker.sock; capsh --print"
+
+        assert detector.detected_types(response) == [
+            "capability_probe",
+            "mount_inspection",
+            "kernel_exploit_recon",
+        ]
+
+    def test_empty_patterns_disable_detection(self):
+        detector = SandboxEscapeDetector(patterns=())
+
+        assert detector.patterns == ()
+        assert detector.detected_types("capsh --print") == []
+
+    def test_custom_patterns_can_be_used(self):
+        detector = SandboxEscapeDetector(
+            patterns=(SandboxEscapePattern("nsenter", re.compile(r"\bnsenter\b")),)
+        )
+
+        assert detector.detected_types("nsenter -t 1 -m") == ["nsenter"]
+        assert detector.detected_types("capsh --print") == []