fix(misconf): load only submodule if it is specified in source

pkg/iac/scanners/terraform/parser/resolvers/cache.go

@@ -51,7 +51,7 @@ func (r *cacheResolver) Resolve(_ context.Context, _ fs.FS, opt Options) (filesy
 		return nil, "", "", false, nil
 	}
 
-	src := removeSubdirFromSource(opt.Source)
+	src, subdir := splitPackageSubdirRaw(opt.Source)
 	key := cacheKey(src, opt.Version)
 
 	opt.Debug("Trying to resolve: %s", key)
@@ -62,7 +62,7 @@ func (r *cacheResolver) Resolve(_ context.Context, _ fs.FS, opt Options) (filesy
 			return nil, "", "", true, err
 		}
 
-		return os.DirFS(filepath.Join(cacheDir, key)), opt.OriginalSource, ".", true, nil
+		return os.DirFS(filepath.Join(cacheDir, key)), opt.OriginalSource, subdir, true, nil
 	}
 	return nil, "", "", false, nil
 }

pkg/iac/scanners/terraform/parser/resolvers/cache_integration_test.go

@@ -21,9 +21,10 @@ func TestResolveModuleFromCache(t *testing.T) {
 	}
 
 	tests := []struct {
-		name          string
-		opts          resolvers.Options
-		firstResolver moduleResolver
+		name           string
+		opts           resolvers.Options
+		firstResolver  moduleResolver
+		expectedSubdir string
 	}{
 		{
 			name: "registry",
@@ -32,7 +33,8 @@ func TestResolveModuleFromCache(t *testing.T) {
 				Source:  "terraform-aws-modules/s3-bucket/aws",
 				Version: "4.1.2",
 			},
-			firstResolver: resolvers.Registry,
+			firstResolver:  resolvers.Registry,
+			expectedSubdir: ".",
 		},
 		{
 			name: "registry with subdir",
@@ -41,23 +43,26 @@ func TestResolveModuleFromCache(t *testing.T) {
 				Source:  "terraform-aws-modules/s3-bucket/aws//modules/object",
 				Version: "4.1.2",
 			},
-			firstResolver: resolvers.Registry,
+			firstResolver:  resolvers.Registry,
+			expectedSubdir: "modules/object",
 		},
 		{
 			name: "remote",
 			opts: resolvers.Options{
 				Name:   "bucket",
 				Source: "git::https://github.com/terraform-aws-modules/terraform-aws-s3-bucket.git?ref=v4.1.2",
 			},
-			firstResolver: resolvers.Remote,
+			firstResolver:  resolvers.Remote,
+			expectedSubdir: ".",
 		},
 		{
 			name: "remote with subdir",
 			opts: resolvers.Options{
 				Name:   "object",
 				Source: "git::https://github.com/terraform-aws-modules/terraform-aws-s3-bucket.git//modules/object?ref=v4.1.2",
 			},
-			firstResolver: resolvers.Remote,
+			firstResolver:  resolvers.Remote,
+			expectedSubdir: "modules/object",
 		},
 	}
 

pkg/iac/scanners/terraform/parser/resolvers/registry.go

@@ -45,7 +45,7 @@ func (r *registryResolver) Resolve(ctx context.Context, target fs.FS, opt Option
 	}
 
 	inputVersion := opt.Version
-	source := removeSubdirFromSource(opt.Source)
+	source, _ := splitPackageSubdirRaw(opt.Source)
 	parts := strings.Split(source, "/")
 	if len(parts) < 3 || len(parts) > 4 {
 		return

pkg/iac/scanners/terraform/parser/resolvers/remote.go

@@ -38,7 +38,7 @@ func (r *remoteResolver) Resolve(ctx context.Context, _ fs.FS, opt Options) (fil
 		return nil, "", "", false, nil
 	}
 
-	src := removeSubdirFromSource(opt.OriginalSource)
+	src, subdir := splitPackageSubdirRaw(opt.OriginalSource)
 	key := cacheKey(src, opt.OriginalVersion)
 	opt.Debug("Storing with cache key %s", key)
 
@@ -54,7 +54,7 @@ func (r *remoteResolver) Resolve(ctx context.Context, _ fs.FS, opt Options) (fil
 	r.incrementCount(opt)
 	opt.Debug("Successfully downloaded %s from %s", opt.Name, opt.Source)
 	opt.Debug("Module '%s' resolved via remote download.", opt.Name)
-	return os.DirFS(cacheDir), opt.Source, filepath.Join(".", opt.RelativePath), true, nil
+	return os.DirFS(cacheDir), opt.Source, subdir, true, nil
 }
 
 func (r *remoteResolver) download(ctx context.Context, opt Options, dst string) error {

pkg/iac/scanners/terraform/parser/resolvers/source.go

@@ -2,7 +2,7 @@ package resolvers
 
 import "strings"
 
-func removeSubdirFromSource(src string) string {
+func splitPackageSubdirRaw(src string) (string, string) {
 	stop := len(src)
 	if idx := strings.Index(src, "?"); idx > -1 {
 		stop = idx
@@ -18,7 +18,7 @@ func removeSubdirFromSource(src string) string {
 	// First see if we even have an explicit subdir
 	idx := strings.Index(src[offset:stop], "//")
 	if idx == -1 {
-		return src
+		return src, "."
 	}
 
 	idx += offset
@@ -29,8 +29,9 @@ func removeSubdirFromSource(src string) string {
 	// URL.
 	if idx = strings.Index(subdir, "?"); idx > -1 {
 		query := subdir[idx:]
+		subdir = subdir[:idx]
 		src += query
 	}
 
-	return src
+	return src, subdir
 }

pkg/iac/scanners/terraform/parser/resolvers/source_test.go

@@ -6,39 +6,45 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-func TestRemoveSubdirFromSource(t *testing.T) {
+func TestSplitPackageSubdirRaw(t *testing.T) {
 
 	tests := []struct {
-		name     string
-		source   string
-		expected string
+		name           string
+		source         string
+		expectedPkg    string
+		expectedSubdir string
 	}{
 		{
-			name:     "address with scheme and query string",
-			source:   "git::https://github.com/aquasecurity/terraform-modules.git//modules/ecs-service?ref=v0.1.0",
-			expected: "git::https://github.com/aquasecurity/terraform-modules.git?ref=v0.1.0",
+			name:           "address with scheme and query string",
+			source:         "git::https://github.com/aquasecurity/terraform-modules.git//modules/ecs-service?ref=v0.1.0",
+			expectedPkg:    "git::https://github.com/aquasecurity/terraform-modules.git?ref=v0.1.0",
+			expectedSubdir: "modules/ecs-service",
 		},
 		{
-			name:     "address with scheme",
-			source:   "git::https://github.com/aquasecurity/terraform-modules.git//modules/ecs-service",
-			expected: "git::https://github.com/aquasecurity/terraform-modules.git",
+			name:           "address with scheme",
+			source:         "git::https://github.com/aquasecurity/terraform-modules.git//modules/ecs-service",
+			expectedPkg:    "git::https://github.com/aquasecurity/terraform-modules.git",
+			expectedSubdir: "modules/ecs-service",
 		},
 		{
-			name:     "registry address",
-			source:   "hashicorp/consul/aws//modules/consul-cluster",
-			expected: "hashicorp/consul/aws",
+			name:           "registry address",
+			source:         "hashicorp/consul/aws//modules/consul-cluster",
+			expectedPkg:    "hashicorp/consul/aws",
+			expectedSubdir: "modules/consul-cluster",
 		},
 		{
-			name:     "without subdir",
-			source:   `hashicorp/consul/aws`,
-			expected: `hashicorp/consul/aws`,
+			name:           "without subdir",
+			source:         `hashicorp/consul/aws`,
+			expectedPkg:    `hashicorp/consul/aws`,
+			expectedSubdir: ".",
 		},
 	}
 
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
-			got := removeSubdirFromSource(test.source)
-			assert.Equal(t, test.expected, got)
+			pkgAddr, subdir := splitPackageSubdirRaw(test.source)
+			assert.Equal(t, test.expectedPkg, pkgAddr)
+			assert.Equal(t, test.expectedSubdir, subdir)
 		})
 	}
 }