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

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* 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
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Eli Peter 2026-05-01 10:59:52 -04:00 • committed by GitHub
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docs/advanced-analysis.md
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@ -245,6 +245,19 @@ cross-function body expansion. See `DEFAULT_BACKWARDS_DEPTH`,
`BACKWARDS_VALUE_BUDGET`, and `MAX_BACKWARDS_CALLEE_BLOCKS` in
`src/taint/backwards.rs` for the exact bounds.
**Cap parity.** The walk treats `DemandState.caps` as opaque bitflags,
every cap defined in `src/labels/mod.rs` round-trips identically through
the demand transfer. Including `Cap::DATA_EXFIL` (bit 13): a
`taint-data-exfiltration` forward finding receives `backwards-confirmed`
exactly like a `taint-unsanitised-flow` SQL/CMD/SSRF finding when its
demand walk reaches a Sensitive source. The cap-routing logic in
`src/ast.rs` then surfaces the rule id correctly regardless of which
direction confirmed the flow. See
`tests/backwards_analysis_tests.rs::demand_driven_suite` (the
`data_exfil` sub-case) and
`taint::backwards::tests::driver_walks_data_exfil_source_to_sink` for
the regression guards.
**Source**: [`src/taint/backwards.rs`](https://github.com/elicpeter/nyx/blob/master/src/taint/backwards.rs).
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