[action] keyless cosign for all release artifacts

Author: dopey

.github/workflows/release.yml

@@ -25,16 +25,16 @@ jobs:
         run: |
           VVERSION=${GITHUB_REF#refs/tags/}
           VERSION=${GITHUB_REF#refs/tags/v}
-          echo "::set-output name=VVERSION::${VVERSION}"
-          echo "::set-output name=VERSION::${VERSION}"
+          echo "VVERSION=${VVERSION}" >> ${GITHUB_OUTPUT}
+          echo "VERSION=${VERSION}" >> ${GITHUB_OUTPUT}
       - name: Is Pre-release
         id: is_prerelease
         run: |
           set +e
           echo ${{ github.ref }} | grep "\-rc.*"
           OUT=$?
           if [ $OUT -eq 0 ]; then IS_PRERELEASE=true; else IS_PRERELEASE=false; fi
-          echo "::set-output name=IS_PRERELEASE::${IS_PRERELEASE}"
+          echo "IS_PRERELEASE=${IS_PRERELEASE}" >> ${GITHUB_OUTPUT}
       - name: Create Release
         id: create_release
         uses: actions/create-release@v1
@@ -50,6 +50,9 @@ jobs:
     name: Upload Assets to Github w/ goreleaser
     runs-on: ubuntu-latest
     needs: create_release
+    permissions:
+      id-token: write
+      contents: write
     steps:
       - name: Checkout
         uses: actions/checkout@v3
@@ -63,31 +66,31 @@ jobs:
         run: |
           PATH=$PATH:/usr/local/go/bin:/home/admin/go/bin
       - name: Install cosign
-        uses: sigstore/cosign-installer@v2.7.0
+        uses: sigstore/cosign-installer@v2
         with:
-          cosign-release: 'v1.12.1'
-      - name: Write cosign key to disk
-        id: write_key
-        run: echo "${{ secrets.COSIGN_KEY }}" > "/tmp/cosign.key"
+          cosign-release: 'v1.13.1'
       - name: Get Release Date
         id: release_date
         run: |
           RELEASE_DATE=$(date +"%y-%m-%d")
-          echo "::set-output name=RELEASE_DATE::${RELEASE_DATE}"
+          echo "RELEASE_DATE=${RELEASE_DATE}" >> ${GITHUB_ENV}
       - name: Run GoReleaser
         uses: goreleaser/goreleaser-action@v3
         with:
           version: 'latest'
           args: release --rm-dist
         env:
           GITHUB_TOKEN: ${{ secrets.GORELEASER_PAT }}
-          COSIGN_PWD: ${{ secrets.COSIGN_PWD }}
-          RELEASE_DATE: ${{ steps.release_date.outputs.RELEASE_DATE }}
+          COSIGN_EXPERIMENTAL: 1
+          RELEASE_DATE: ${RELEASE_DATE}
 
   build_upload_docker:
     name: Build & Upload Docker Images
     runs-on: ubuntu-latest
     needs: ci
+    permissions:
+      id-token: write
+      contents: write
     steps:
       - name: Checkout
         uses: actions/checkout@v3
@@ -97,12 +100,9 @@ jobs:
           go-version: 1.19
           check-latest: true
       - name: Install cosign
-        uses: sigstore/cosign-installer@v2.7.0
+        uses: sigstore/cosign-installer@v2
         with:
-          cosign-release: 'v1.12.1'
-      - name: Write cosign key to disk
-        id: write_key
-        run: echo "${{ secrets.COSIGN_KEY }}" > "/tmp/cosign.key"
+          cosign-release: 'v1.13.1'
       - name: Build
         id: build
         run: |
@@ -111,4 +111,4 @@ jobs:
         env:
           DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
           DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
-          COSIGN_PWD: ${{ secrets.COSIGN_PWD }}
+          COSIGN_EXPERIMENTAL: 1

.goreleaser.yml

@@ -89,8 +89,9 @@ checksum:
 
 signs:
 - cmd: cosign
-  stdin: '{{ .Env.COSIGN_PWD }}'
-  args: ["sign-blob", "-key=/tmp/cosign.key", "-output-signature=${signature}", "${artifact}"]
+  signature: "${artifact}.sig"
+  certificate: "${artifact}.pem"
+  args: ["sign-blob", "--oidc-issuer=https://token.actions.githubusercontent.com", "--output-certificate=${certificate}", "--output-signature=${signature}", "${artifact}"]
   artifacts: all
 
 snapshot:
@@ -135,8 +136,8 @@ release:
 
     ```
     cosign verify-blob \
-      -key https://raw.githubusercontent.com/smallstep/step-sds/master/cosign.pub \
-      -signature ~/Downloads/step-sds_darwin_{{ .Version }}_amd64.tar.gz.sig
+      --certificate ~/Downloads/step-sds_darwin_{{ .Version }}_amd64.tar.gz.pem \
+      --signature ~/Downloads/step-sds_darwin_{{ .Version }}_amd64.tar.gz.sig \
       ~/Downloads/step-sds_darwin_{{ .Version }}_amd64.tar.gz
     ```
 

Makefile

@@ -198,7 +198,13 @@ docker-make:
 #################################################
 
 DOCKER_TAG=docker tag smallstep/$(1):latest smallstep/$(1):$(2)
-DOCKER_PUSH=docker push smallstep/$(1):$(2)
+
+define DOCKER_PUSH
+	# $(1) -- App Name
+	# $(2) -- Image Tag
+	docker push smallstep/$(1):$(2)
+	cosign sign -r smallstep/$(1):$(2)
+endef
 
 docker-tag:
 	$(call DOCKER_TAG,step-sds,$(VERSION))