ci: add cargo-deny and cargo-audit checks

.github/workflows/audit.yml

@@ -0,0 +1,46 @@
+name: Dependency audit
+
+# `Cargo.lock` is not in the repository. Each run resolves the newest
+# compatible versions. A scheduled run finds new advisories and yanked
+# crates even when no one changes the code.
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  schedule:
+    - cron: "0 6 * * 1"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  deny:
+    name: cargo deny
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Run cargo-deny
+        uses: EmbarkStudios/cargo-deny-action@v2
+        with:
+          command: check
+          arguments: --all-features
+
+  audit:
+    name: cargo audit
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+      - name: Install cargo-audit
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-audit
+      - name: Create lockfile
+        run: cargo generate-lockfile
+      - name: Run cargo-audit
+        # Unmaintained crates give a warning only. Vulnerabilities fail the job
+        # by default. Yanked and unsound crates also fail the job.
+        run: cargo audit --deny yanked --deny unsound

CHANGELOG.md

@@ -5,6 +5,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Added
+- A `Dependency audit` CI workflow runs `cargo deny` and `cargo audit` on each push and pull request, and every week. It fails when a dependency has a known vulnerability, is yanked, uses a license that is not allowed, or comes from an unknown source. The `deny.toml` file holds the rules.
+
 ### Fixed
 - The ndarray implementation of `Array2::from_iterator` now preserves column-major input order, including for rectangular matrices that previously caused a panic. Column-major input produces a column-major array (#482).
 

Cargo.toml

@@ -18,7 +18,8 @@ exclude = [
     "smartcore.iml",
     "smartcore.svg",
     "tests/",
-    "AGENTS.md"
+    "AGENTS.md",
+    "deny.toml"
 ]
 
 [dependencies]

deny.toml

@@ -0,0 +1,35 @@
+# Configuration for cargo-deny.
+# Documentation: https://embarkstudios.github.io/cargo-deny/
+#
+# Run locally with: cargo deny --all-features check
+
+[graph]
+all-features = true
+
+[advisories]
+# Fail if a dependency is yanked. A yanked version can have a known defect.
+yanked = "deny"
+ignore = [
+    # `atomic-polyfill` is unmaintained. It enters the graph only through
+    # `postcard` -> `heapless`, and `postcard` is a dev-dependency.
+    # Remove this entry when `postcard` stops using `heapless` 0.7.
+    { id = "RUSTSEC-2023-0089", reason = "Dev-dependency only (postcard -> heapless). Not in the published crate." },
+]
+
+[licenses]
+# Licenses that dependencies can use. `smartcore` is Apache-2.0.
+allow = [
+    "Apache-2.0",
+    "MIT",
+    "Unicode-3.0",
+]
+
+[bans]
+# Different versions of one crate are common in the tree. Show them, do not fail.
+multiple-versions = "warn"
+wildcards = "deny"
+
+[sources]
+unknown-registry = "deny"
+unknown-git = "deny"
+allow-registry = ["https://github.com/rust-lang/crates.io-index"]