feat: add --deep MIR-based analysis via capsec-driver#52
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Adds a `--deep` flag to `cargo capsec audit` that uses rustcs MIR
(Mid-level IR) to analyze all crates in the dependency tree, catching
authority usage that syntactic analysis misses — macro-expanded FFI
calls try_call!, trait dispatch, and generic instantiation.
Architecture:
- New `crates/capsec-deep/` crate (excluded from workspace, requires nightly)
- `capsec-driver` binary implements `rustc_driver::Callbacks::after_analysis`
- Walks MIR BasicBlocks → TerminatorKind::Call → extracts DefId targets
- Classifies calls against authority patterns via def_path_str
- Detects FFI calls via tcx.is_foreign_item — sees through macro wrappers
- Filters std/core/alloc and proc-macro crates to reduce noise
- Uses RUSTC_WRAPPER to analyze all crates including transitive dependencies
- Communicates findings via JSONL temp file ($CAPSEC_DEEP_OUTPUT)
- CLI reads JSONL, patches crate names/versions to match Cargo metadata,
deduplicates against syntactic findings, merges into unified output
Tested on heartwood: 613 → 837 findings, 12 → 26 crates analyzed.
New findings include std::net socket config calls, std::fs::OpenOptions,
std::env::temp_dir, and FFI calls resolved through macros that the
syntactic scanner could not see.
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Adds a
--deepflag tocargo capsec auditthat uses rustcs MIR(Mid-level IR) to analyze all crates in the dependency tree, catching
authority usage that syntactic analysis misses — macro-expanded FFI
calls try_call!, trait dispatch, and generic instantiation.
Architecture:
crates/capsec-deep/crate (excluded from workspace, requires nightly)capsec-driverbinary implementsrustc_driver::Callbacks::after_analysisTested on heartwood: 613 → 837 findings, 12 → 26 crates analyzed.
New findings include std::net socket config calls, std::fs::OpenOptions,
std::env::temp_dir, and FFI calls resolved through macros that the
syntactic scanner could not see.