fix(scorecard): share validated action-lock audit semantics

lib/scorecard_ingestor.ex

@@ -561,28 +561,34 @@ defmodule Hypatia.ScorecardIngestor do
             String.ends_with?(f, ".yml") or String.ends_with?(f, ".yaml")
           end)
 
-        unpinned =
-          yml_files
-          |> Enum.filter(fn f ->
-            path = Path.join(workflows_dir, f)
+        # Share the workflow auditor's validated lock semantics. A raw tag
+        # regex contradicts the estate's action-lock policy, while accepting
+        # the mere presence of a lock would silently hide integrity failures.
+        contents = Map.new(yml_files, &{&1, File.read!(Path.join(workflows_dir, &1))})
 
-            case File.read(path) do
-              {:ok, content} ->
-                # Check for actions using tags instead of SHA hashes
-                # Match pattern: uses: owner/repo@v1 (tag) vs uses: owner/repo@abc123 (SHA)
-                Regex.match?(~r/uses:\s+[\w-]+\/[\w-]+@v\d/, content)
+        lock_content =
+          case File.read(Path.join(workflows_dir, "actions.lock")) do
+            {:ok, content} ->
+              content
 
-              _ ->
-                false
-            end
-          end)
+            {:error, :enoent} ->
+              nil
+
+            {:error, reason} ->
+              raise File.Error, reason: reason, action: "read", path: workflows_dir
+          end
+
+        findings =
+          Hypatia.Rules.WorkflowAudit.check_unpinned_actions(contents, actions_lock: lock_content)
+          |> Enum.reject(&(&1.type == :pin_exempt_accepted))
 
-        if length(unpinned) > 0 do
+        if findings != [] do
           make_pattern(
             "SC-013",
             "Pinned-Dependencies",
             repo_name,
-            "#{length(unpinned)} workflow(s) with tag-pinned (not SHA-pinned) actions in #{repo_name}"
+            "#{length(findings)} action-pinning integrity finding(s) in #{repo_name}; " <>
+              "verify .github/workflows/actions.lock with gh actions-lock"
           )
         end
 

test/scorecard_ingestor_actions_lock_test.exs

@@ -0,0 +1,79 @@
+# SPDX-License-Identifier: MPL-2.0
+defmodule Hypatia.ScorecardIngestorActionsLockTest do
+  use ExUnit.Case, async: true
+
+  @workflow """
+  permissions:
+    contents: read
+  jobs:
+    test:
+      steps:
+        - uses: actions/checkout@v7.0.1
+  """
+  @lock """
+  version: 'v0.0.2'
+  workflows:
+      '.github/workflows/ci.yml':
+          - 'actions/checkout@v7.0.1'
+  dependencies:
+      'actions/checkout@v7.0.1':
+          ref: 'v7.0.1'
+          commit: 'sha1-3d3c42e5aac5ba805825da76410c181273ba90b1'
+          owner_id: 44036562
+          repo_id: 197814629
+  """
+
+  setup do
+    dir = Path.join(System.tmp_dir!(), "scorecard-lock-#{System.unique_integer([:positive])}")
+    File.mkdir_p!(Path.join(dir, ".github/workflows"))
+    File.write!(Path.join(dir, ".github/workflows/ci.yml"), @workflow)
+    on_exit(fn -> File.rm_rf!(dir) end)
+    %{dir: dir}
+  end
+
+  defp pinning_findings(dir) do
+    {:ok, findings} = Hypatia.ScorecardIngestor.local_scan(dir, "fixture")
+    Enum.filter(findings, &(&1["category"] == "DependencyPinning"))
+  end
+
+  test "symbolic action with a valid associated lock is pinned", %{dir: dir} do
+    File.write!(Path.join(dir, ".github/workflows/actions.lock"), @lock)
+    assert pinning_findings(dir) == []
+  end
+
+  test "missing lock still reports the unpinned action", %{dir: dir} do
+    assert [_] = pinning_findings(dir)
+  end
+
+  test "malformed lock fails closed rather than accepting symbolic refs", %{dir: dir} do
+    File.write!(Path.join(dir, ".github/workflows/actions.lock"), "version: 'invalid'\n")
+    assert [_] = pinning_findings(dir)
+  end
+
+  test "a valid lock for a different workflow does not cover this workflow", %{dir: dir} do
+    File.write!(
+      Path.join(dir, ".github/workflows/actions.lock"),
+      String.replace(@lock, "ci.yml", "other.yml")
+    )
+
+    assert [_] = pinning_findings(dir)
+  end
+
+  test "a valid lock for a different ref does not cover this ref", %{dir: dir} do
+    File.write!(
+      Path.join(dir, ".github/workflows/actions.lock"),
+      String.replace(@lock, "v7.0.1", "v7.0.0")
+    )
+
+    assert [_] = pinning_findings(dir)
+  end
+
+  test "unpinned sub-actions and branch refs are detected", %{dir: dir} do
+    File.write!(
+      Path.join(dir, ".github/workflows/ci.yml"),
+      String.replace(@workflow, "actions/checkout@v7.0.1", "github/codeql-action/analyze@main")
+    )
+
+    assert [_] = pinning_findings(dir)
+  end
+end