chore: make build dirs of java builders unique (#2665)

Fixes the following from
#2662:

- The internal Action. It must add randomization and return a new output
- The publish / download Actions. They need an additional input for the
randomized name.

---------

Signed-off-by: AdamKorcz <adam@adalogics.com>

.github/workflows/builder_gradle_slsa3.yml

@@ -50,10 +50,17 @@ on:
         description: "The sha256 of the provenance attestation uploaded to the workflow run."
         value: "${{ jobs.slsa-run.outputs.attestations-download-sha256 }}"
 
-      target-download-sha256:
-        description: "The sha256 of the target uploaded to the workflow run."
+      build-download-name:
+        description: "The name of the build directory uploaded to the workflow run."
+        # NOTE: This is an "untrusted" value returned from the build. Technically
+        # the build could provide a build directory that doesn't match the
+        # provenance but it would fail validation.
+        value: "${{ fromJSON(jobs.slsa-run.outputs.build-artifacts-outputs).build-download-name }}"
+
+      build-download-sha256:
+        description: "The sha256 of the build directory uploaded to the workflow run."
         # NOTE: This is an "untrusted" value returned from the build.
-        value: "${{ fromJSON(jobs.slsa-run.outputs.build-artifacts-outputs).target-download-sha256 }}"
+        value: "${{ fromJSON(jobs.slsa-run.outputs.build-artifacts-outputs).build-download-sha256 }}"
 jobs:
   slsa-setup:
     permissions:

.github/workflows/builder_maven_slsa3.yml

@@ -47,6 +47,13 @@ on:
         description: "The sha256 of the provenance attestation uploaded to the workflow run."
         value: "${{ jobs.slsa-run.outputs.attestations-download-sha256 }}"
 
+      target-download-name:
+        description: "The name of the target directory uploaded to the workflow run."
+        # NOTE: This is an "untrusted" value returned from the build. Technically
+        # the build could provide a target directory that doesn't match the
+        # provenance but it would fail validation.
+        value: ${{ fromJSON(jobs.slsa-run.outputs.build-artifacts-outputs).package-download-name }}
+
       target-download-sha256:
         description: "The sha256 of the target uploaded to the workflow run."
         value: "${{ fromJSON(jobs.slsa-run.outputs.build-artifacts-outputs).target-download-sha256 }}"

actions/gradle/publish/README.md

@@ -260,15 +260,16 @@ publish:
       with:
         provenance-download-name: "${{ needs.build.outputs.provenance-download-name }}"
         provenance-download-sha256: "${{ needs.build.outputs.provenance-download-sha256 }}"
-        target-download-sha256: "${{ needs.build.outputs.target-download-sha256 }}"
+        build-download-name: "${{ needs.build.outputs.build-download-name }}"
+        build-download-sha256: "${{ needs.build.outputs.build-download-sha256 }}"
         maven-username: ${{ secrets.OSSRH_USERNAME }}
         maven-password: ${{ secrets.OSSRH_PASSWORD }}
         gpg-key-pass: ${{ secrets.GPG_PASSPHRASE }}
         gpg-private-key: ${{ secrets.GPG_PRIVATE_KEY }}
         jdk-version: "17"
 ```
 
-Set the values of "maven-username", "maven-password", "gpg-key-pass" and " gpg-private-key" for your account. The parameters to `provenance-download-name`, `provenance-download-sha256` and `target-download-sha256` should not be changed.
+Set the values of "maven-username", "maven-password", "gpg-key-pass" and " gpg-private-key" for your account. The parameters to `provenance-download-name`, `provenance-download-sha256`, `target-download-name`, and `target-download-sha256` should not be changed.
 
 Once you trigger this workflow, your artifacts and provenance files will be added to a staging repository in Maven Central. You need to close the staging repository and then release:
 

actions/gradle/publish/action.yml

@@ -22,8 +22,12 @@ inputs:
     description: "The sha256 of the package provenance artifact."
     required: false
     type: string
-  target-download-sha256:
-    description: "The sha256 of the target directory."
+  build-download-name:
+    description: "The name of the build directory from the build action."
+    required: true
+    type: string
+  build-download-sha256:
+    description: "The sha256 of the build directory."
     required: true
     type: string
   jdk-version:
@@ -68,12 +72,12 @@ runs:
         path: ./
         sha256: "${{ inputs.provenance-download-sha256 }}"
 
-    - name: Download the target dir
+    - name: Download the build dir
       uses: slsa-framework/slsa-github-generator/.github/actions/secure-download-folder@main
       with:
-        name: build
+        name: "${{ inputs.build-download-name }}"
         path: ./
-        sha256: "${{ inputs.target-download-sha256 }}"
+        sha256: "${{ inputs.build-download-sha256 }}"
     - name: Upload to Maven Central
       shell: bash
       env:

actions/maven/publish/README.md

@@ -49,14 +49,15 @@ publish:
       with:
         provenance-download-name: "${{ needs.build.outputs.provenance-download-name }}"
         provenance-download-sha256: "${{ needs.build.outputs.provenance-download-sha256 }}"
+        target-download-name: "${{ needs.build.outputs.target-download-name }}"
         target-download-sha256: "${{ needs.build.outputs.target-download-sha256 }}"
         maven-username: ${{ secrets.OSSRH_USERNAME }}
         maven-password: ${{ secrets.OSSRH_PASSWORD }}
         gpg-key-pass: ${{ secrets.GPG_PASSPHRASE }}
         gpg-private-key: ${{ secrets.GPG_PRIVATE_KEY }}
 ```
 
-Set the values of "maven-username", "maven-password", "gpg-key-pass" and " gpg-private-key" for your account. The parameters to `provenance-download-name`, `provenance-download-sha256` and `target-download-sha256` should not be changed.
+Set the values of "maven-username", "maven-password", "gpg-key-pass" and " gpg-private-key" for your account. The parameters to `provenance-download-name`, `provenance-download-sha256`, `target-download-name`, and `target-download-sha256` should not be changed.
 
 Once you trigger this workflow, your artifacts and provenance files will be added to a staging repository in Maven Central. You need to close the staging repository and then release:
 

actions/maven/publish/action.yml

@@ -21,6 +21,10 @@ inputs:
     description: "The sha256 of the package provenance artifact."
     required: true
     type: string
+  target-download-name:
+    description: "The name of the target directory."
+    required: true
+    type: string
   target-download-sha256:
     description: "The sha256 of the target directory."
     required: true
@@ -67,7 +71,7 @@ runs:
     - name: Download the target dir
       uses: slsa-framework/slsa-github-generator/.github/actions/secure-download-folder@main
       with:
-        name: target
+        name: "${{ inputs.target-download-name }}"
         path: ./
         sha256: "${{ inputs.target-download-sha256 }}"
 

internal/builders/gradle/action.yml

@@ -40,13 +40,17 @@ inputs:
   slsa-workflow-secret14: {}
   slsa-workflow-secret15: {}
 outputs:
-  target-download-sha256:
+  build-download-sha256:
     description: >
       The sha256 digest of the "build" directory.
 
       Users should verify the download against this digest to prevent tampering.
     value: ${{ steps.upload-build-dir.outputs.sha256 }}
 
+  build-download-name:
+    description: "Name of the artifact to download the build directory."
+    value: "${{ steps.rng.outputs.random }}-build"
+
 on:
   workflow_call:
 runs:
@@ -93,6 +97,12 @@ runs:
         cd "${project_root}" \
           && ./gradlew build -x test
 
+    # rng generates a random number to avoid name collision in artifacts
+    # when multiple workflows run concurrently.
+    - name: Generate random 16-byte value (32-char hex encoded)
+      id: rng
+      uses: slsa-framework/slsa-github-generator/.github/actions/rng@main
+
     - name: Put release artifacts in one directory
       shell: bash
       env:
@@ -119,5 +129,5 @@ runs:
       id: upload-build-dir
       uses: slsa-framework/slsa-github-generator/.github/actions/secure-upload-folder@main
       with:
-        name: build
+        name: "${{ steps.rng.outputs.random }}-build"
         path: build

internal/builders/maven/action.yml

@@ -47,6 +47,10 @@ outputs:
       Users should verify the download against this digest to prevent tampering.
     value: ${{ steps.upload-target.outputs.sha256 }}
 
+  target-download-name:
+    description: "Name of the artifact to download the target directory."
+    value: "${{ steps.rng.outputs.random }}-target"
+
 on:
   workflow_call:
 runs:
@@ -103,9 +107,16 @@ runs:
         # not be in GITHUB_WORKSPACE, so we need to move the file.
         mv $(dirname "${SLSA_OUTPUTS_ARTIFACTS_FILE}") "${GITHUB_WORKSPACE}/../"
         mv target "${GITHUB_WORKSPACE}/"
+
+    # rng generates a random number to avoid name collision in artifacts
+    # when multiple workflows run concurrently.
+    - name: Generate random 16-byte value (32-char hex encoded)
+      id: rng
+      uses: slsa-framework/slsa-github-generator/.github/actions/rng@main
+
     - name: Upload target
       id: upload-target
       uses: slsa-framework/slsa-github-generator/.github/actions/secure-upload-folder@main
       with:
-        name: target
+        name: "${{ steps.rng.outputs.random }}-target"
         path: target