feat(misconf): Add support for using spec from on-disk bundle

pkg/compliance/spec/compliance.go

@@ -3,8 +3,10 @@ package spec
 import (
 	"fmt"
 	"os"
+	"path/filepath"
 	"strings"
 
+	"github.com/aquasecurity/trivy/pkg/log"
 	"github.com/samber/lo"
 	"golang.org/x/xerrors"
 	"gopkg.in/yaml.v3"
@@ -70,18 +72,41 @@ func scannerByCheckID(checkID string) types.Scanner {
 	}
 }
 
+func checksDir(cacheDir string) string {
+	return filepath.Join(cacheDir, "policy")
+}
+
+func complianceSpecDir(cacheDir string) string {
+	return filepath.Join(checksDir(cacheDir), "content", "specs", "compliance")
+}
+
 // GetComplianceSpec accepct compliance flag name/path and return builtin or file system loaded spec
-func GetComplianceSpec(specNameOrPath string) (ComplianceSpec, error) {
+func GetComplianceSpec(specNameOrPath string, cacheDir string) (ComplianceSpec, error) {
+	if specNameOrPath == "" {
+		return ComplianceSpec{}, nil
+	}
+
 	var b []byte
 	var err error
-	if strings.HasPrefix(specNameOrPath, "@") {
+	if strings.HasPrefix(specNameOrPath, "@") { // load user specified spec from disk
 		b, err = os.ReadFile(strings.TrimPrefix(specNameOrPath, "@"))
 		if err != nil {
 			return ComplianceSpec{}, fmt.Errorf("error retrieving compliance spec from path: %w", err)
 		}
 	} else {
-		// TODO: GetSpecByName() should return []byte
 		b = []byte(sp.NewSpecLoader().GetSpecByName(specNameOrPath))
+		_, err := os.Stat(filepath.Join(checksDir(cacheDir), "metadata.json"))
+		if err != nil { // cache corrupt or bundle does not exist, load embedded version
+			b = []byte(sp.NewSpecLoader().GetSpecByName(specNameOrPath))
+			log.Debug("Compliance spec loaded from embedded library", log.String("spec", specNameOrPath))
+		} else {
+			// load from bundle on disk
+			b, err = LoadFromBundle(cacheDir, specNameOrPath)
+			if err != nil {
+				return ComplianceSpec{}, err
+			}
+			log.Debug("Compliance spec loaded from disk bundle", log.String("spec", specNameOrPath))
+		}
 	}
 
 	var complianceSpec ComplianceSpec
@@ -91,3 +116,11 @@ func GetComplianceSpec(specNameOrPath string) (ComplianceSpec, error) {
 	return complianceSpec, nil
 
 }
+
+func LoadFromBundle(cacheDir string, specNameOrPath string) ([]byte, error) {
+	b, err := os.ReadFile(filepath.Join(complianceSpecDir(cacheDir), specNameOrPath+".yaml"))
+	if err != nil {
+		return nil, fmt.Errorf("error retrieving compliance spec from bundle %s: %w", specNameOrPath, err)
+	}
+	return b, nil
+}

pkg/compliance/spec/compliance_test.go

@@ -1,10 +1,12 @@
 package spec_test
 
 import (
+	"path/filepath"
 	"sort"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 
 	"github.com/aquasecurity/trivy/pkg/compliance/spec"
 	iacTypes "github.com/aquasecurity/trivy/pkg/iac/types"
@@ -239,3 +241,53 @@ func TestComplianceSpec_CheckIDs(t *testing.T) {
 		})
 	}
 }
+
+func TestComplianceSpec_LoadFromDiskBundle(t *testing.T) {
+
+	t.Run("load user specified spec from disk", func(t *testing.T) {
+		cs, err := spec.GetComplianceSpec(filepath.Join("@testdata", "testcache", "policy", "content", "specs", "compliance", "testspec.yaml"), filepath.Join("testdata", "testcache"))
+		require.NoError(t, err)
+		assert.Equal(t, spec.ComplianceSpec{Spec: iacTypes.Spec{
+			ID:          "test-spec-1.2",
+			Title:       "Test Spec",
+			Description: "This is a test spec",
+			RelatedResources: []string{
+				"https://www.google.ca",
+			},
+			Version: "1.2",
+			Controls: []iacTypes.Control{
+				{
+					Name:        "moar-testing",
+					Description: "Test needs foo bar baz",
+					ID:          "1.1",
+					Checks: []iacTypes.SpecCheck{
+						{ID: "AVD-TEST-1234"},
+					},
+					Severity: "LOW",
+				},
+			},
+		}}, cs)
+	})
+
+	t.Run("load user specified spec from disk fails", func(t *testing.T) {
+		_, err := spec.GetComplianceSpec("@doesnotexist", "does-not-matter")
+		assert.Contains(t, err.Error(), "error retrieving compliance spec from path")
+	})
+
+	t.Run("bundle does not exist", func(t *testing.T) {
+		cs, err := spec.GetComplianceSpec("aws-cis-1.2", "does-not-matter")
+		require.NoError(t, err)
+		assert.Equal(t, "aws-cis-1.2", cs.Spec.ID)
+	})
+
+	t.Run("load spec from disk", func(t *testing.T) {
+		cs, err := spec.GetComplianceSpec("testspec", filepath.Join("testdata", "testcache"))
+		require.NoError(t, err)
+		assert.Equal(t, "test-spec-1.2", cs.Spec.ID)
+	})
+
+	t.Run("load spec yaml unmarshal failure", func(t *testing.T) {
+		_, err := spec.GetComplianceSpec("invalid", filepath.Join("testdata", "testcache"))
+		assert.Contains(t, err.Error(), "spec yaml decode error")
+	})
+}

pkg/compliance/spec/testdata/testcache/policy/content/specs/compliance/invalid.yaml

@@ -0,0 +1 @@
+this is not yaml but easier to read

pkg/compliance/spec/testdata/testcache/policy/content/specs/compliance/testspec.yaml

@@ -0,0 +1,15 @@
+spec:
+  id: test-spec-1.2
+  title: Test Spec
+  description: This is a test spec
+  version: "1.2"
+  relatedResources:
+    - https://www.google.ca
+  controls:
+    - id: "1.1"
+      name: moar-testing
+      description: |-
+        Test needs foo bar baz
+      checks:
+        - id: AVD-TEST-1234
+      severity: LOW

pkg/compliance/spec/testdata/testcache/policy/metadata.json

@@ -0,0 +1 @@
+{"Digest":"sha256:ef2d9ad4fce0f933b20a662004d7e55bf200987c180e7f2cd531af631f408bb3","DownloadedAt":"2024-08-07T20:07:48.917915-06:00"}

pkg/flag/report_flags.go

@@ -4,6 +4,7 @@ import (
 	"slices"
 	"strings"
 
+	"github.com/aquasecurity/trivy/pkg/cache"
 	"github.com/mattn/go-shellwords"
 	"github.com/samber/lo"
 	"golang.org/x/xerrors"
@@ -260,7 +261,7 @@ func loadComplianceTypes(compliance string) (spec.ComplianceSpec, error) {
 		return spec.ComplianceSpec{}, xerrors.Errorf("unknown compliance : %v", compliance)
 	}
 
-	cs, err := spec.GetComplianceSpec(compliance)
+	cs, err := spec.GetComplianceSpec(compliance, cache.DefaultDir())
 	if err != nil {
 		return spec.ComplianceSpec{}, xerrors.Errorf("spec loading from file system error: %w", err)
 	}