Add new v2alpha4 version for PipelineRuns

This new version will now process the information from any associated StepAction from the executed PipelineRun when `artifacts.pipelinerun.enable-deep-inspection` is set to `true`.

Also, the way chains read results from PipelineRuns to populate the `subjects` field is changing: now the user has to explicitly mark a result as a subject using an object type-hinted tag (*ARTIFACT_OUTPUTS) + the new `isBuildArtifact` property in the value.

Refactors to share logic between v2alph3 and v2alpha4.

docs/config.md

@@ -35,7 +35,7 @@ Supported keys include:
 
 | Key                                            | Description                                                                                                                                                                                                                                                                                 | Supported Values                           | Default   |
 | :--------------------------------------------- | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | :----------------------------------------- | :-------- |
-| `artifacts.pipelinerun.format`                 | The format to store `PipelineRun` payloads in.                                                                                                                                                                                                                                              | `in-toto`, `slsa/v1`, `slsa/v2alpha3`      | `in-toto` |
+| `artifacts.pipelinerun.format`                 | The format to store `PipelineRun` payloads in.                                                                                                                                                                                                                                              | `in-toto`, `slsa/v1`, `slsa/v2alpha3`, `slsa/v2alpha4`      | `in-toto` |
 | `artifacts.pipelinerun.storage`                | The storage backend to store `PipelineRun` signatures in. Multiple backends can be specified with comma-separated list ("tekton,oci"). To disable the `PipelineRun` artifact input an empty string ("").                                                                                    | `tekton`, `oci`, `gcs`, `docdb`, `grafeas` | `tekton`  |
 | `artifacts.pipelinerun.signer`                 | The signature backend to sign `PipelineRun` payloads with.                                                                                                                                                                                                                                  | `x509`, `kms`                              | `x509`    |
 | `artifacts.pipelinerun.enable-deep-inspection` | This boolean option will configure whether Chains should inspect child taskruns in order to capture inputs/outputs within a pipelinerun. `"false"` means that Chains only checks pipeline level results, whereas `"true"` means Chains inspects both pipeline level and task level results. | `"true"`, `"false"`                        | `"false"` |
@@ -45,6 +45,7 @@ Supported keys include:
 > - For grafeas storage backend, currently we only support Container Analysis. We will make grafeas server address configurabe within a short time.
 > - `slsa/v1` is an alias of `in-toto` for backwards compatibility.
 > - `slsa/v2alpha3` corresponds to the slsav1.0 spec. and uses latest [`v1` Tekton Objects](https://tekton.dev/docs/pipelines/pipeline-api/#tekton.dev/v1). Recommended format for new chains users who want the slsav1.0 spec.
+> - `slsa/v2alpha4` corresponds to the slsav1.0 spec. and uses latest [`v1` Tekton Objects](https://tekton.dev/docs/pipelines/pipeline-api/#tekton.dev/v1). It reads type-hinted results from [StepActions](https://tekton.dev/docs/pipelines/pipeline-api/#tekton.dev/v1alpha1.StepAction) when `artifacts.pipelinerun.enable-deep-inspection` is set to `true`. Recommended format for new chains users who want the slsav1.0 spec.
 
 
 ### OCI Configuration

examples/v2alpha4/pipeline-with-object-type-hinting.yaml

@@ -0,0 +1,35 @@
+apiVersion: tekton.dev/v1
+kind: PipelineRun
+metadata:
+  name: pipeline-test-run
+spec:
+  pipelineSpec:
+    results:
+    - name: output1-ARTIFACT_OUTPUTS
+      value: $(tasks.t1.results.output1)
+    - name: output2-ARTIFACT_OUTPUTS
+      value: $(tasks.t1.results.output2)
+    tasks:
+      - name: t1
+        taskSpec:
+          results:
+          - name: output1
+            type: object
+            properties:
+              uri: {}
+              digest: {}
+              isBuildArtifact: {}
+
+          - name: output2
+            type: object
+            properties:
+              uri: {}
+              digest: {}
+
+          steps:
+            - name: step1
+              image: busybox:glibc
+              script: |
+                echo -n "Hello!"
+                echo -n "{\"uri\":\"gcr.io/foo/img1\", \"digest\":\"sha256:586789aa031fafc7d78a5393cdc772e0b55107ea54bb8bcf3f2cdac6c6da51ee\", \"isBuildArtifact\": \"true\" }" > $(results.output1.path)
+                echo -n "{\"uri\":\"gcr.io/foo/img2\", \"digest\":\"sha256:586789aa031fafc7d78a5393cdc772e0b55107ea54bb8bcf3f2cdac6c6da51ee\"}" > $(results.output2.path)

pkg/chains/formats/slsa/internal/build_definition/build_definition.go

@@ -22,6 +22,7 @@ import (
 	externalparameters "github.com/tektoncd/chains/pkg/chains/formats/slsa/internal/external_parameters"
 	internalparameters "github.com/tektoncd/chains/pkg/chains/formats/slsa/internal/internal_parameters"
 	resolveddependencies "github.com/tektoncd/chains/pkg/chains/formats/slsa/internal/resolved_dependencies"
+	"github.com/tektoncd/chains/pkg/chains/formats/slsa/internal/slsaconfig"
 	"github.com/tektoncd/chains/pkg/chains/objects"
 	"google.golang.org/protobuf/encoding/protojson"
 	"google.golang.org/protobuf/types/known/structpb"
@@ -62,6 +63,46 @@ func GetTaskRunBuildDefinition(ctx context.Context, tro *objects.TaskRunObjectV1
 	}, nil
 }
 
+// GetPipelineRunBuildDefinition returns the buildDefinition for the given PipelineRun based on the configured buildType. This will default to the slsa buildType
+func GetPipelineRunBuildDefinition(ctx context.Context, pro *objects.PipelineRunObjectV1, slsaconfig *slsaconfig.SlsaConfig, resolveOpts resolveddependencies.ResolveOptions) (slsa.BuildDefinition, error) {
+	buildDefinitionType := slsaconfig.BuildType
+	if slsaconfig.BuildType == "" {
+		buildDefinitionType = buildtypes.SlsaBuildType
+	}
+
+	td, err := resolveddependencies.GetTaskDescriptor(buildDefinitionType)
+	if err != nil {
+		return slsa.BuildDefinition{}, err
+	}
+
+	rd, err := resolveddependencies.PipelineRun(ctx, pro, slsaconfig, resolveOpts, td)
+	if err != nil {
+		return slsa.BuildDefinition{}, err
+	}
+
+	externalParams := externalparameters.PipelineRun(pro)
+	structExternalParams, err := getStruct(externalParams)
+	if err != nil {
+		return slsa.BuildDefinition{}, err
+	}
+
+	internalParams, err := internalparameters.GetInternalParamters(pro, buildDefinitionType)
+	if err != nil {
+		return slsa.BuildDefinition{}, err
+	}
+	structInternalParams, err := getStruct(internalParams)
+	if err != nil {
+		return slsa.BuildDefinition{}, err
+	}
+
+	return slsa.BuildDefinition{
+		BuildType:            buildDefinitionType,
+		ExternalParameters:   structExternalParams,
+		InternalParameters:   structInternalParams,
+		ResolvedDependencies: rd,
+	}, nil
+}
+
 func getStruct(data map[string]any) (*structpb.Struct, error) {
 	bytes, err := json.Marshal(data)
 	if err != nil {

pkg/chains/formats/slsa/internal/build_definition/build_definition_test.go

@@ -19,16 +19,18 @@ import (
 
 	"github.com/google/go-cmp/cmp"
 	slsa "github.com/in-toto/attestation/go/predicates/provenance/v1"
+	intoto "github.com/in-toto/attestation/go/v1"
 	externalparameters "github.com/tektoncd/chains/pkg/chains/formats/slsa/internal/external_parameters"
 	internalparameters "github.com/tektoncd/chains/pkg/chains/formats/slsa/internal/internal_parameters"
 	resolveddependencies "github.com/tektoncd/chains/pkg/chains/formats/slsa/internal/resolved_dependencies"
+	"github.com/tektoncd/chains/pkg/chains/formats/slsa/internal/slsaconfig"
 	"github.com/tektoncd/chains/pkg/chains/objects"
 	"github.com/tektoncd/chains/pkg/internal/objectloader"
 	"google.golang.org/protobuf/testing/protocmp"
 	"google.golang.org/protobuf/types/known/structpb"
 )
 
-func TestGetBuildDefinition(t *testing.T) {
+func TestGetTaskRunBuildDefinition(t *testing.T) {
 	tr, err := objectloader.TaskRunFromFile("../../testdata/slsa-v2alpha4/taskrun1.json")
 	if err != nil {
 		t.Fatal(err)
@@ -103,7 +105,7 @@ func TestGetBuildDefinition(t *testing.T) {
 	}
 }
 
-func TestUnsupportedBuildType(t *testing.T) {
+func TestTaskRunUnsupportedBuildType(t *testing.T) {
 	tr, err := objectloader.TaskRunFromFile("../../testdata/slsa-v2alpha4/taskrun1.json")
 	if err != nil {
 		t.Fatal(err)
@@ -127,3 +129,102 @@ func getProtoStruct(t *testing.T, data map[string]any) *structpb.Struct {
 
 	return protoStruct
 }
+
+func TestGetPipelineRunBuildDefinition(t *testing.T) {
+	pr := createPro("../../testdata/slsa-v2alpha3/pipelinerun1.json")
+	pr.Annotations = map[string]string{
+		"annotation1": "annotation1",
+	}
+	pr.Labels = map[string]string{
+		"label1": "label1",
+	}
+	tests := []struct {
+		name   string
+		config *slsaconfig.SlsaConfig
+		want   slsa.BuildDefinition
+	}{
+		{
+			name:   "test slsa build type",
+			config: &slsaconfig.SlsaConfig{BuildType: "https://tekton.dev/chains/v2/slsa"},
+			want: slsa.BuildDefinition{
+				BuildType:            "https://tekton.dev/chains/v2/slsa",
+				ExternalParameters:   getProtoStruct(t, externalparameters.PipelineRun(pr)),
+				InternalParameters:   getProtoStruct(t, internalparameters.SLSAInternalParameters(pr)),
+				ResolvedDependencies: getResolvedDependencies(pr, resolveddependencies.AddSLSATaskDescriptor),
+			},
+		},
+		{
+			name:   "test tekton build type",
+			config: &slsaconfig.SlsaConfig{BuildType: "https://tekton.dev/chains/v2/slsa-tekton"},
+			want: slsa.BuildDefinition{
+				BuildType:            "https://tekton.dev/chains/v2/slsa-tekton",
+				ExternalParameters:   getProtoStruct(t, externalparameters.PipelineRun(pr)),
+				InternalParameters:   getProtoStruct(t, internalparameters.TektonInternalParameters(pr)),
+				ResolvedDependencies: getResolvedDependencies(pr, resolveddependencies.AddTektonTaskDescriptor),
+			},
+		},
+		{
+			name:   "test default build type",
+			config: &slsaconfig.SlsaConfig{BuildType: "https://tekton.dev/chains/v2/slsa"},
+			want: slsa.BuildDefinition{
+				BuildType:            "https://tekton.dev/chains/v2/slsa",
+				ExternalParameters:   getProtoStruct(t, externalparameters.PipelineRun(pr)),
+				InternalParameters:   getProtoStruct(t, internalparameters.SLSAInternalParameters(pr)),
+				ResolvedDependencies: getResolvedDependencies(pr, resolveddependencies.AddSLSATaskDescriptor),
+			},
+		},
+	}
+
+	for i := range tests {
+		tc := &tests[i]
+		t.Run(tc.name, func(t *testing.T) {
+			bd, err := GetPipelineRunBuildDefinition(context.TODO(), pr, tc.config, resolveddependencies.ResolveOptions{})
+			if err != nil {
+				t.Fatalf("Did not expect an error but got %v", err)
+			}
+
+			if diff := cmp.Diff(&tc.want, &bd, protocmp.Transform()); diff != "" {
+				t.Errorf("getBuildDefinition(): -want +got: %v", diff)
+			}
+		})
+	}
+}
+
+func createPro(path string) *objects.PipelineRunObjectV1 {
+	pr, err := objectloader.PipelineRunFromFile(path)
+	if err != nil {
+		panic(err)
+	}
+	tr1, err := objectloader.TaskRunFromFile("../../testdata/slsa-v2alpha3/taskrun1.json")
+	if err != nil {
+		panic(err)
+	}
+	tr2, err := objectloader.TaskRunFromFile("../../testdata/slsa-v2alpha3/taskrun2.json")
+	if err != nil {
+		panic(err)
+	}
+	p := objects.NewPipelineRunObjectV1(pr)
+	p.AppendTaskRun(tr1)
+	p.AppendTaskRun(tr2)
+	return p
+}
+
+func getResolvedDependencies(pr *objects.PipelineRunObjectV1, addTasks func(*objects.TaskRunObjectV1) (*intoto.ResourceDescriptor, error)) []*intoto.ResourceDescriptor {
+	rd, err := resolveddependencies.PipelineRun(context.Background(), pr, &slsaconfig.SlsaConfig{}, resolveddependencies.ResolveOptions{}, addTasks)
+	if err != nil {
+		return []*intoto.ResourceDescriptor{}
+	}
+	return rd
+}
+
+func TestPipelineRunUnsupportedBuildType(t *testing.T) {
+	pr := createPro("../../testdata/slsa-v2alpha3/pipelinerun1.json")
+
+	got, err := GetPipelineRunBuildDefinition(context.Background(), pr, &slsaconfig.SlsaConfig{BuildType: "bad-buildtype"}, resolveddependencies.ResolveOptions{})
+	if err == nil {
+		t.Error("getBuildDefinition(): expected error got nil")
+	}
+	if diff := cmp.Diff(&slsa.BuildDefinition{}, &got, protocmp.Transform()); diff != "" {
+		t.Errorf("getBuildDefinition(): -want +got: %s", diff)
+	}
+}