Added Cap::DATA_EXFIL and taint fp and fn fixes on real repos (#59)

* feat: Enhance data exfiltration detection with source sensitivity gating for cookies and headers

* feat: Implement cross-file data exfiltration detection with parameter-specific gate filters

* feat: Add calibration tests and refine DATA_EXFIL severity scoring logic

* feat: Introduce per-detector configuration for data exfiltration suppression

* feat: Enhance DATA_EXFIL findings with destination field tracking in diagnostics and SARIF output

* feat: Add tainted body and URL handling for data exfiltration detection

* feat: Add integration tests and fixtures for DATA_EXFIL and SSRF detection in Go

* feat: Add Java integration tests and fixtures for DATA_EXFIL detection across multiple HTTP clients

* feat: Add synthetic externals handling for closure-captured variables in SSA

* feat: Implement closure-based suppression for resource leak findings

* feat: Add regression guards for shell-injection and taint propagation in for-of destructure patterns

* feat: Implement constructor cap narrowing for data exfiltration detection in HTTP request builders

* feat: Add gated sinks for data exfiltration detection in C and C++ using curl_easy_setopt

* feat: Implement DATA_EXFIL cap parity for backwards analysis and add integration tests

* feat: Add data exfiltration sinks for various languages and enhance documentation

* refactor: Simplify formatting and improve readability in various files

* refactor: Improve readability by simplifying conditional statements and adding clippy linting

* docs: Update CHANGELOG and comments for data exfiltration features and configuration

* docs: Clarify configuration instructions for data exfiltration trusted destinations

* docs: Enhance comments for evidence routing logic in data exfiltration

tests/fixtures/demand_driven_data_exfil/app.py

@@ -0,0 +1,20 @@
+"""demand_driven_data_exfil.
+
+`Cap::DATA_EXFIL` parity for the backwards-analysis pass.  The forward
+engine emits a `taint-data-exfiltration` finding for the cookie →
+fetch-body flow (Sensitive source, fixed destination URL).  With
+`backwards_analysis = true`, the post-pass must walk backwards from the
+DATA_EXFIL sink demand, reach the cookie source, and annotate the
+finding with `backwards-confirmed`.  Validates that the cap-routing
+logic in `taint/backwards.rs::DemandState` round-trips bit 13
+(DATA_EXFIL) identically to the SQL/CMD/SSRF caps the rest of the
+demand-driven suite covers.
+"""
+
+import requests
+from flask import request
+
+
+def forward_session():
+    sid = request.cookies.get("session")
+    requests.post("https://analytics.internal/track", json={"session": sid})

tests/fixtures/demand_driven_data_exfil/expectations.json

@@ -0,0 +1,16 @@
+{
+  "required_findings": [
+    { "id_prefix": "taint-data-exfiltration", "min_count": 1 }
+  ],
+  "forbidden_findings": [],
+  "noise_budget": {
+    "max_total_findings": 4,
+    "max_high_findings": 2
+  },
+  "performance_expectations": {
+    "max_ms_no_index": 1500,
+    "max_ms_index_cold": 2000,
+    "max_ms_index_warm": 800,
+    "ci_mode": "lenient"
+  }
+}