Readability fixes for KubeCon NA '23 demo

.github/actions/scai-gen-assert/action.yml

@@ -43,7 +43,8 @@ runs:
 
     - name: Generate ResourceDescriptor for evidence
       id: gen-rd
-      uses: ./.github/actions/scai-gen-rd
+      # change to v0.2 tag when released
+      uses: in-toto/scai-demos/.github/actions/scai-gen-rd@main
       with:
         name: "${{ inputs.evidence-file }}"
         path: "${{ inputs.evidence-path }}"
@@ -54,6 +55,5 @@ runs:
       id: scai-gen-assert
       shell: bash
       run: |
-        mkdir -p ${{ inputs.assertion-path }}
-        scai-gen assert -e ${{ steps.gen-rd.outputs.file-rd-name }} -o ${{ inputs.assertion-path }}/${{ inputs.assertion-name }} ${{ inputs.attribute}}
+        scai-gen assert --evidence ${{ steps.gen-rd.outputs.file-rd-name }} --out-file ${{ inputs.assertion-path }}/${{ inputs.assertion-name }} ${{ inputs.attribute}}
         echo "assertion-name=${{ inputs.assertion-path }}/${{ inputs.assertion-name }}" >> "$GITHUB_OUTPUT"

.github/actions/scai-gen-rd/action.yml

@@ -54,15 +54,13 @@ runs:
       if: ${{ inputs.is-file == 'true' }}
       shell: bash
       run: |
-        mkdir -p ${{ inputs.rd-path }}
-        scai-gen rd file -n ${{ inputs.name }} -l ${{ inputs.location }} -t ${{ inputs.media-type }} -o ${{ inputs.rd-path }}/${{ inputs.rd-name }} ${{ inputs.path }}/${{ inputs.name }}
+        scai-gen rd file --name ${{ inputs.name }} --download-location ${{ inputs.location }} --media-type ${{ inputs.media-type }} --out-file ${{ inputs.rd-path }}/${{ inputs.rd-name }} ${{ inputs.path }}/${{ inputs.name }}
         echo "rd-name=${{ inputs.rd-path }}/${{ inputs.rd-name }}" >> "$GITHUB_OUTPUT"
 
     - name: Run scai-gen rd remote
       id: scai-gen-rd-remote
       if: ${{ inputs.is-file == 'false' }}
       shell: bash
       run: |
-        mkdir -p ${{ inputs.rd-path }}
-        scai-gen rd remote -n ${{ inputs.name }} -d ${{ inputs.digest }} -g ${{ inputs.hash-alg }} -o ${{ inputs.rd-path }}/${{ inputs.rd-name }} ${{ inputs.uri }}
+        scai-gen rd remote --name ${{ inputs.name }} --digest ${{ inputs.digest }} --hash-alg ${{ inputs.hash-alg }} --out-file ${{ inputs.rd-path }}/${{ inputs.rd-name }} ${{ inputs.uri }}
         echo "rd-name=${{ inputs.rd-path }}/${{ inputs.rd-name }}" >> "$GITHUB_OUTPUT"

.github/actions/scai-gen-report/action.yml

@@ -27,10 +27,8 @@ runs:
       id: scai-gen-report
       shell: bash
       run: |
-        mkdir -p ${{ inputs.report-path }}
-        scai-gen report -s ${{ inputs.subject }} -o ${{ inputs.report-path }}/${{ inputs.report-name }} ${{ inputs.attr-assertions }}
+        scai-gen report --subject ${{ inputs.subject }} --out-file ${{ inputs.report-path }}/${{ inputs.report-name }} --pretty-print ${{ inputs.attr-assertions }}
         echo "report-name=${{ inputs.report-path }}/${{ inputs.report-name }}" >> "$GITHUB_OUTPUT"
-        ls ${{ inputs.report-path }}
 
     - name: Upload the signed SCAI AttributeReport
       id: upload-assert

.github/actions/scai-gen-sigstore/action.yml

@@ -32,8 +32,7 @@ runs:
       id: sign
       shell: bash
       run: |
-        mkdir -p ${{ inputs.attestation-path }}
-        scai-gen sigstore -o ${{ inputs.attestation-path}}/${{ inputs.attestation-name }} ${{ inputs.statement-path }}/${{ inputs.statement-name }}
+        scai-gen sigstore --out-file ${{ inputs.attestation-path}}/${{ inputs.attestation-name }} ${{ inputs.statement-path }}/${{ inputs.statement-name }}
         echo "attestation-name=${{ inputs.attestation-path }}/${{ inputs.attestation-name }}" >> "$GITHUB_OUTPUT"
 
     - name: Save the signed in-toto Attestation

README.md

@@ -32,15 +32,19 @@ for Python and Go environments.
 We encourage you to gain a basic understanding of the [SCAI specification]
 before using the scai-generator CLI tools in this repo.
 
+For a full demo of how to use the Go [scai-gen](scai-gen/) tools, read our
+[KubeCon + CloudNativeCon NA '23 doc].
+
 ## Disclaimer
 
 While the tools in this repo are conformant to the
 [in-toto Attestation Framework], they do not generate **authenticated** SCAI
 attestations. The example use cases in this repo are only provided for
-illustrative purposes.
+illustrative purposes, and should not be used in production.
 
 [in-toto Attestation Framework]: https://github.com/in-toto/attestation/tree/main/spec
 [intro doc]: docs/intro.md
+[KubeCon + CloudNativeCon NA '23]: docs/kccncna2023.md
 [usage doc]: docs/usage.md
 [SCAI specification]: https://github.com/in-toto/attestation/blob/main/spec/predicates/scai.md
 [SCAI spec doc]: https://arxiv.org/pdf/2210.05813.pdf

docs/kccncna2023.md

@@ -0,0 +1,45 @@
+# KubeCon + CloudNativeCon NA '23 Demo
+
+As part of the [in-toto Maintainer Track talk] at KubeCon + CloudNativeCon NA
+'23, we present a demo of the in-toto Attestation Framework, SCAI, and the
+in-toto Attestation Verifier.
+
+## Demo Setup
+
+The overall flow implemented in the demo is as follows:
+
+<img src="./images/intoto-kccncna2023-demo.png" alt="in-toto demo flow" width="600">
+
+This demo setup is implemented using the [scai-gen GitHub Actions] in a Docker
+container build [demo workflow] for the Hyperledger Labs Private Data Objects
+project.
+
+### Generated Attestations
+
+This demo generates the follow _authenticated_ in-toto attestations:
+
+* [SLSA Provenance] attestation for the container build
+* [SCAI Attribute Report] attestation for additional integrity metadata about
+the build
+
+These two attestations are signed using cosign OIDC-based keyless signing,
+and uploaded to the public Rekor log.
+
+### Additional Tools
+
+This demo makes use of the following additional tools:
+
+* in-toto [attestation-verifier]
+* [Anchore SBOM generator] GitHub Action
+* [SLSA generic Provenance generator] GitHub Action
+* [strace] Linux syscall tracer
+
+[Anchore SBOM generator]: https://github.com/anchore/sbom-action
+[attestation-verifier]: https://github.com/in-toto/attestation-verifier
+[demo workflow]: https://github.com/marcelamelara/private-data-objects/blob/intoto-kccncna2023-demo/.github/workflows/intoto-kccncna2023-demo.yml
+[in-toto Maintainer Track talk]: https://kccncna2023.sched.com/event/1R2mx
+[SLSA generic Provenance generator]: https://github.com/slsa-framework/slsa-github-generator
+[SLSA Provenance]: https://github.com/in-toto/attestation/blob/main/spec/predicates/provenance.md
+[SCAI Attribute Report]: https://github.com/in-toto/attestation/blob/main/spec/predicates/scai.md
+[scai-gen GitHub Actions]: https://github.com/in-toto/scai-demos/tree/main/.github/actions
+[strace]: https://strace.io/

scai-gen/cmd/assert.go

@@ -60,6 +60,11 @@ func init() {
 }
 
 func genAttrAssertion(_ *cobra.Command, args []string) error {
+	// want to make sure the AttributeAssertion is a JSON file
+	if !fileio.HasJSONExt(outFile) {
+		return fmt.Errorf("expected a .json extension for the generated SCAI AttributeAssertion file %s", outFile)
+	}
+
 	attribute := args[0]
 
 	var target *ita.ResourceDescriptor
@@ -101,5 +106,5 @@ func genAttrAssertion(_ *cobra.Command, args []string) error {
 		return fmt.Errorf("invalid SCAI attribute assertion: %w", err)
 	}
 
-	return fileio.WritePbToFile(aa, outFile)
+	return fileio.WritePbToFile(aa, outFile, false)
 }

scai-gen/cmd/rd.go

@@ -75,14 +75,6 @@ func init() {
 		"The URI of the resource",
 	)
 
-	rdFileCmd.Flags().BoolVarP(
-		&withContent,
-		"content",
-		"c",
-		false,
-		"Flag to include the content of the file",
-	)
-
 	rdFileCmd.Flags().StringVarP(
 		&downloadLocation,
 		"download-location",
@@ -165,6 +157,11 @@ func readAnnotations(filename string) (*structpb.Struct, error) {
 }
 
 func genRdFromFile(_ *cobra.Command, args []string) error {
+	// want to make sure the ResourceDescriptor is a JSON file
+	if !fileio.HasJSONExt(outFile) {
+		return fmt.Errorf("expected a .json extension for the generated ResourceDescriptor file %s", outFile)
+	}
+
 	filename := args[0]
 	fileBytes, err := os.ReadFile(filename)
 	if err != nil {
@@ -203,10 +200,15 @@ func genRdFromFile(_ *cobra.Command, args []string) error {
 		return fmt.Errorf("invalid resource descriptor: %w", err)
 	}
 
-	return fileio.WritePbToFile(rd, outFile)
+	return fileio.WritePbToFile(rd, outFile, false)
 }
 
 func genRdForRemote(_ *cobra.Command, args []string) error {
+	// want to make sure the ResourceDescriptor is a JSON file
+	if !fileio.HasJSONExt(outFile) {
+		return fmt.Errorf("expected a .json extension for the generated ResourceDescriptor file %s", outFile)
+	}
+
 	remoteURI := args[0]
 
 	digestSet := make(map[string]string)
@@ -240,5 +242,5 @@ func genRdForRemote(_ *cobra.Command, args []string) error {
 		return fmt.Errorf("invalid resource descriptor: %w", err)
 	}
 
-	return fileio.WritePbToFile(rd, outFile)
+	return fileio.WritePbToFile(rd, outFile, false)
 }

scai-gen/cmd/report.go

@@ -50,9 +50,22 @@ func init() {
 		"",
 		"The filename of the JSON-encoded producer resource descriptor",
 	)
+
+	reportCmd.Flags().BoolVarP(
+		&prettyPrint,
+		"pretty-print",
+		"y",
+		false,
+		"Flag to JSON pretty-print the generated Report",
+	)
 }
 
 func genAttrReport(_ *cobra.Command, args []string) error {
+	// want to make sure the Report is a JSON file
+	if !fileio.HasJSONExt(outFile) {
+		return fmt.Errorf("expected a .json extension for the generated in-toto Statement file %s", outFile)
+	}
+
 	attrAsserts := make([]*scai.AttributeAssertion, 0, len(args))
 	for _, attrAssertPath := range args {
 		aa := &scai.AttributeAssertion{}
@@ -117,5 +130,5 @@ func genAttrReport(_ *cobra.Command, args []string) error {
 		return fmt.Errorf("invalid in-toto Statement: %w", err)
 	}
 
-	return fileio.WritePbToFile(statement, outFile)
+	return fileio.WritePbToFile(statement, outFile, prettyPrint)
 }

scai-gen/cmd/root.go

@@ -12,7 +12,10 @@ var rootCmd = &cobra.Command{
 	Short: "A CLI tool for generating/checking SCAI metadata",
 }
 
-var outFile string
+var (
+	outFile     string
+	prettyPrint bool
+)
 
 func init() {
 	rootCmd.AddCommand(rdCmd)

scai-gen/cmd/sigstore.go

@@ -73,6 +73,11 @@ func getNewFulcioSigner(ctx context.Context) (*fulcio.Signer, error) {
 func signWithSigstore(cmd *cobra.Command, args []string) error {
 	fmt.Println("EXPERIMENTAL FEATURE. DO NOT USE IN PRODUCTION.")
 
+	// want to make sure the DSSE is a JSON file
+	if !fileio.HasJSONExt(outFile) {
+		return fmt.Errorf("expected a .json extension for the generated DSSE file %s", outFile)
+	}
+
 	statementFile := args[0]
 	statement := &ita.Statement{}
 	err := fileio.ReadPbFromFile(statementFile, statement)

scai-gen/fileio/common.go

@@ -0,0 +1,17 @@
+package fileio
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func HasJSONExt(filename string) bool {
+	return strings.HasSuffix(filename, ".json")
+}
+
+func CreateOutDir(filename string) error {
+	outDir := filepath.Dir(filename)
+
+	return os.MkdirAll(outDir, 0644)
+}

scai-gen/fileio/dsse.go

@@ -44,5 +44,10 @@ func ReadStatementFromDSSEFile(path string) (*ita.Statement, error) {
 }
 
 func WriteDSSEToFile(envBytes []byte, outFile string) error {
+	// ensure the out directory exists
+	if err := CreateOutDir(outFile); err != nil {
+		return fmt.Errorf("error creating output directory for file %s: %w", outFile, err)
+	}
+
 	return os.WriteFile(outFile, envBytes, 0644) //nolint:gosec
 }

scai-gen/fileio/pb.go

@@ -8,12 +8,24 @@ import (
 	"google.golang.org/protobuf/proto"
 )
 
-func WritePbToFile(pb proto.Message, outFile string) error {
-	pbBytes, err := protojson.Marshal(pb)
+func WritePbToFile(pb proto.Message, outFile string, pretty bool) error {
+	opt := &protojson.MarshalOptions{}
+	if pretty {
+		opt.Multiline = true
+		opt.Indent = "    "
+		opt.EmitUnpopulated = false
+	}
+
+	pbBytes, err := opt.Marshal(pb)
 	if err != nil {
 		return err
 	}
 
+	// ensure the out directory exists
+	if err = CreateOutDir(outFile); err != nil {
+		return fmt.Errorf("error creating output directory for file %s: %w", outFile, err)
+	}
+
 	return os.WriteFile(outFile, pbBytes, 0644) //nolint:gosec
 }