fix: Fix --file-patterns flag

Resolves #774

Signed-off-by: Liam Galvin <liam.galvin@aquasec.com>

integration/fs_test.go

@@ -23,6 +23,7 @@ func TestFilesystem(t *testing.T) {
 		listAllPkgs    bool
 		input          string
 		secretConfig   string
+		filePatterns   []string
 	}
 	tests := []struct {
 		name   string
@@ -79,6 +80,16 @@ func TestFilesystem(t *testing.T) {
 			},
 			golden: "testdata/dockerfile.json.golden",
 		},
+		{
+			name: "dockerfile with custom file pattern",
+			args: args{
+				securityChecks: "config",
+				input:          "testdata/fixtures/fs/dockerfile_file_pattern",
+				namespaces:     []string{"testing"},
+				filePatterns:   []string{"dockerfile:Customfile"},
+			},
+			golden: "testdata/dockerfile_file_pattern.json.golden",
+		},
 		{
 			name: "dockerfile with rule exception",
 			args: args{
@@ -178,6 +189,12 @@ func TestFilesystem(t *testing.T) {
 				defer os.Remove(trivyIgnore)
 			}
 
+			if len(tt.args.filePatterns) != 0 {
+				for _, filePattern := range tt.args.filePatterns {
+					osArgs = append(osArgs, "--file-patterns", filePattern)
+				}
+			}
+
 			// Setup the output file
 			outputFile := filepath.Join(t.TempDir(), "output.json")
 			if *update {

integration/testdata/dockerfile_file_pattern.json.golden

@@ -0,0 +1,56 @@
+{
+  "SchemaVersion": 2,
+  "ArtifactName": "testdata/fixtures/fs/dockerfile_file_pattern",
+  "ArtifactType": "filesystem",
+  "Metadata": {
+    "ImageConfig": {
+      "architecture": "",
+      "created": "0001-01-01T00:00:00Z",
+      "os": "",
+      "rootfs": {
+        "type": "",
+        "diff_ids": null
+      },
+      "config": {}
+    }
+  },
+  "Results": [
+    {
+      "Target": "Customfile",
+      "Class": "config",
+      "Type": "dockerfile",
+      "MisconfSummary": {
+        "Successes": 21,
+        "Failures": 1,
+        "Exceptions": 0
+      },
+      "Misconfigurations": [
+        {
+          "Type": "Dockerfile Security Check",
+          "ID": "DS002",
+          "Title": "Image user should not be 'root'",
+          "Description": "Running containers with 'root' user can lead to a container escape situation. It is a best practice to run containers as non-root users, which can be done by adding a 'USER' statement to the Dockerfile.",
+          "Message": "Specify at least 1 USER command in Dockerfile with non-root user as argument",
+          "Namespace": "builtin.dockerfile.DS002",
+          "Query": "data.builtin.dockerfile.DS002.deny",
+          "Resolution": "Add 'USER \u003cnon root user name\u003e' line to the Dockerfile",
+          "Severity": "HIGH",
+          "PrimaryURL": "https://avd.aquasec.com/misconfig/ds002",
+          "References": [
+            "https://docs.docker.com/develop/develop-images/dockerfile_best-practices/",
+            "https://avd.aquasec.com/misconfig/ds002"
+          ],
+          "Status": "FAIL",
+          "Layer": {},
+          "CauseMetadata": {
+            "Provider": "Dockerfile",
+            "Service": "general",
+            "Code": {
+              "Lines": null
+            }
+          }
+        }
+      ]
+    }
+  ]
+}

integration/testdata/fixtures/fs/dockerfile_file_pattern/Customfile

@@ -0,0 +1 @@
+FROM alpine:3.13

pkg/fanal/handler/misconf/misconf.go

@@ -39,6 +39,7 @@ func init() {
 const version = 1
 
 type misconfPostHandler struct {
+	options  artifact.Option
 	scanners map[string]scanners.Scanner
 }
 
@@ -177,6 +178,7 @@ func newMisconfPostHandler(artifactOpt artifact.Option) (handler.PostHandler, er
 	}
 
 	return misconfPostHandler{
+		options: artifactOpt,
 		scanners: map[string]scanners.Scanner{
 			types.Terraform:      tfscanner.New(opts...),
 			types.CloudFormation: cfscanner.New(opts...),
@@ -197,6 +199,15 @@ var enabledDefsecTypes = map[detection.FileType]string{
 	detection.FileTypeRbac:           types.Rbac,
 }
 
+func (h misconfPostHandler) hasCustomPatternForType(t string) bool {
+	for _, pattern := range h.options.MisconfScannerOption.FilePatterns {
+		if strings.HasPrefix(pattern, t+":") {
+			return true
+		}
+	}
+	return false
+}
+
 // Handle detects misconfigurations.
 func (h misconfPostHandler) Handle(ctx context.Context, result *analyzer.AnalysisResult, blob *types.BlobInfo) error {
 	files, ok := result.Files[h.Type()]
@@ -214,7 +225,7 @@ func (h misconfPostHandler) Handle(ctx context.Context, result *analyzer.Analysi
 		for defsecType, localType := range enabledDefsecTypes {
 
 			buffer := bytes.NewReader(file.Content)
-			if !detection.IsType(file.Path, buffer, defsecType) {
+			if !h.hasCustomPatternForType(localType) && !detection.IsType(file.Path, buffer, defsecType) {
 				continue
 			}
 			// Replace with more detailed config type