Merge branch 'main' into vmjoseph/node-js-monitor

packages/attest/README.md

@@ -112,6 +112,10 @@ export type AttestProvenanceOptions = {
   sigstore?: 'public-good' | 'github'
   // Whether to skip writing the attestation to the GH attestations API.
   skipWrite?: boolean
+  // Issuer URL responsible for minting the OIDC token from which the
+  // provenance data is read. Defaults to
+  // 'https://token.actions.githubusercontent.com".
+  issuer?: string
 }
 ```
 

packages/attest/RELEASES.md

@@ -1,5 +1,9 @@
 # @actions/attest Releases
 
+### 1.1.0
+
+- Updates the `attestProvenance` function to retrieve a token from the GitHub OIDC provider and use the token claims to populate the provenance statement.
+
 ### 1.0.0
 
 - Initial release

packages/attest/__tests__/__snapshots__/intoto.test.ts.snap

@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`buildIntotoStatement returns a provenance hydrated from env vars 1`] = `
+exports[`buildIntotoStatement returns an intoto statement 1`] = `
 {
   "_type": "https://in-toto.io/Statement/v1",
   "predicate": {

packages/attest/__tests__/__snapshots__/provenance.test.ts.snap

@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`buildSLSAProvenancePredicate returns a provenance hydrated from env vars 1`] = `
+exports[`provenance functions buildSLSAProvenancePredicate returns a provenance hydrated from an OIDC token 1`] = `
 {
   "params": {
     "buildDefinition": {

packages/attest/__tests__/intoto.test.ts

@@ -16,7 +16,7 @@ describe('buildIntotoStatement', () => {
     }
   }
 
-  it('returns a provenance hydrated from env vars', () => {
+  it('returns an intoto statement', () => {
     const statement = buildIntotoStatement(subject, predicate)
     expect(statement).toMatchSnapshot()
   })

packages/attest/__tests__/oidc.test.ts

@@ -0,0 +1,147 @@
+import * as jose from 'jose'
+import nock from 'nock'
+import {getIDTokenClaims} from '../src/oidc'
+
+describe('getIDTokenClaims', () => {
+  const originalEnv = process.env
+  const issuer = 'https://example.com'
+  const audience = 'nobody'
+  const requestToken = 'token'
+  const openidConfigPath = '/.well-known/openid-configuration'
+  const jwksPath = '/.well-known/jwks.json'
+  const tokenPath = '/token'
+  const openIDConfig = {jwks_uri: `${issuer}${jwksPath}`}
+
+  /* eslint-disable-next-line @typescript-eslint/no-explicit-any */
+  let key: any
+
+  beforeEach(async () => {
+    process.env = {
+      ...originalEnv,
+      ACTIONS_ID_TOKEN_REQUEST_URL: `${issuer}${tokenPath}?`,
+      ACTIONS_ID_TOKEN_REQUEST_TOKEN: requestToken
+    }
+
+    // Generate JWT signing key
+    key = await jose.generateKeyPair('PS256')
+
+    // Create JWK and JWKS
+    const jwk = await jose.exportJWK(key.publicKey)
+    const jwks = {keys: [jwk]}
+
+    nock(issuer).get(openidConfigPath).reply(200, openIDConfig)
+    nock(issuer).get(jwksPath).reply(200, jwks)
+  })
+
+  afterEach(() => {
+    process.env = originalEnv
+  })
+
+  describe('when ID token is valid', () => {
+    const claims = {
+      iss: issuer,
+      aud: audience,
+      ref: 'ref',
+      sha: 'sha',
+      repository: 'repo',
+      event_name: 'push',
+      workflow_ref: 'main',
+      repository_id: '1',
+      repository_owner_id: '1',
+      runner_environment: 'github-hosted',
+      run_id: '1',
+      run_attempt: '1'
+    }
+
+    beforeEach(async () => {
+      const jwt = await new jose.SignJWT(claims)
+        .setProtectedHeader({alg: 'PS256'})
+        .sign(key.privateKey)
+
+      nock(issuer).get(tokenPath).query({audience}).reply(200, {value: jwt})
+    })
+
+    it('returns the ID token claims', async () => {
+      const result = await getIDTokenClaims(issuer)
+      expect(result).toEqual(claims)
+    })
+  })
+
+  describe('when ID token is missing required claims', () => {
+    const claims = {
+      iss: issuer,
+      aud: audience
+    }
+
+    beforeEach(async () => {
+      const jwt = await new jose.SignJWT(claims)
+        .setProtectedHeader({alg: 'PS256'})
+        .sign(key.privateKey)
+
+      nock(issuer).get(tokenPath).query({audience}).reply(200, {value: jwt})
+    })
+
+    it('throws an error', async () => {
+      await expect(getIDTokenClaims(issuer)).rejects.toThrow(/missing claims/i)
+    })
+  })
+
+  describe('when ID has the wrong issuer', () => {
+    const claims = {foo: 'bar', iss: 'foo', aud: 'nobody'}
+
+    beforeEach(async () => {
+      const jwt = await new jose.SignJWT(claims)
+        .setProtectedHeader({alg: 'PS256'})
+        .sign(key.privateKey)
+
+      nock(issuer).get(tokenPath).query({audience}).reply(200, {value: jwt})
+    })
+
+    it('throws an error', async () => {
+      await expect(getIDTokenClaims(issuer)).rejects.toThrow(/issuer invalid/)
+    })
+  })
+
+  describe('when ID has the wrong audience', () => {
+    const claims = {foo: 'bar', iss: issuer, aud: 'bar'}
+
+    beforeEach(async () => {
+      const jwt = await new jose.SignJWT(claims)
+        .setProtectedHeader({alg: 'PS256'})
+        .sign(key.privateKey)
+
+      nock(issuer).get(tokenPath).query({audience}).reply(200, {value: jwt})
+    })
+
+    it('throw an error', async () => {
+      await expect(getIDTokenClaims(issuer)).rejects.toThrow(/audience invalid/)
+    })
+  })
+
+  describe('when openid config cannot be retrieved', () => {
+    const claims = {foo: 'bar', iss: issuer, aud: 'nobody'}
+
+    beforeEach(async () => {
+      const jwt = await new jose.SignJWT(claims)
+        .setProtectedHeader({alg: 'PS256'})
+        .sign(key.privateKey)
+
+      nock(issuer).get(tokenPath).query({audience}).reply(200, {value: jwt})
+
+      // Disable the openid config endpoint
+      nock.removeInterceptor({
+        proto: 'https',
+        hostname: 'example.com',
+        port: '443',
+        method: 'GET',
+        path: openidConfigPath
+      })
+    })
+
+    it('throws an error', async () => {
+      await expect(getIDTokenClaims(issuer)).rejects.toThrow(
+        /failed to get id/i
+      )
+    })
+  })
+})

packages/attest/__tests__/provenance.test.ts

@@ -1,213 +1,240 @@
 import * as github from '@actions/github'
 import {mockFulcio, mockRekor, mockTSA} from '@sigstore/mock'
+import * as jose from 'jose'
 import nock from 'nock'
 import {SIGSTORE_GITHUB, SIGSTORE_PUBLIC_GOOD} from '../src/endpoints'
 import {attestProvenance, buildSLSAProvenancePredicate} from '../src/provenance'
 
-// Dummy workflow environment
+describe('provenance functions', () => {
-const env = {
-  GITHUB_REPOSITORY: 'owner/repo',
-  GITHUB_REF: 'refs/heads/main',
-  GITHUB_SHA: 'babca52ab0c93ae16539e5923cb0d7403b9a093b',
-  GITHUB_WORKFLOW_REF: 'owner/repo/.github/workflows/main.yml@main',
-  GITHUB_SERVER_URL: 'https://github.com',
-  GITHUB_EVENT_NAME: 'push',
-  GITHUB_REPOSITORY_ID: 'repo-id',
-  GITHUB_REPOSITORY_OWNER_ID: 'owner-id',
-  GITHUB_RUN_ID: 'run-id',
-  GITHUB_RUN_ATTEMPT: 'run-attempt',
-  RUNNER_ENVIRONMENT: 'github-hosted'
-}
-
-describe('buildSLSAProvenancePredicate', () => {
-  it('returns a provenance hydrated from env vars', () => {
-    const predicate = buildSLSAProvenancePredicate(env)
-    expect(predicate).toMatchSnapshot()
-  })
-})
-
-describe('attestProvenance', () => {
-  // Capture original environment variables so we can restore them after each
-  // test
   const originalEnv = process.env
+  const issuer = 'https://example.com'
+  const audience = 'nobody'
+  const jwksPath = '/.well-known/jwks.json'
+  const tokenPath = '/token'
 
-  // Subject to attest
+  const claims = {
-  const subjectName = 'subjective'
+    iss: issuer,
-  const subjectDigest = {
+    aud: 'nobody',
-    sha256: '7d070f6b64d9bcc530fe99cc21eaaa4b3c364e0b2d367d7735671fa202a03b32'
+    repository: 'owner/repo',
+    ref: 'refs/heads/main',
+    sha: 'babca52ab0c93ae16539e5923cb0d7403b9a093b',
+    workflow_ref: 'owner/repo/.github/workflows/main.yml@main',
+    event_name: 'push',
+    repository_id: 'repo-id',
+    repository_owner_id: 'owner-id',
+    run_id: 'run-id',
+    run_attempt: 'run-attempt',
+    runner_environment: 'github-hosted'
   }
 
-  // Fake an OIDC token
-  const oidcPayload = {sub: 'foo@bar.com', iss: ''}
-  const oidcToken = `.${Buffer.from(JSON.stringify(oidcPayload)).toString(
-    'base64'
-  )}.}`
-
-  const tokenURL = 'https://token.url'
-  const attestationID = '1234567890'
-
   beforeEach(async () => {
-    jest.clearAllMocks()
-
-    nock(tokenURL)
-      .get('/')
-      .query({audience: 'sigstore'})
-      .reply(200, {value: oidcToken})
-
-    // Set-up GHA environment variables
     process.env = {
       ...originalEnv,
-      ...env,
+      ACTIONS_ID_TOKEN_REQUEST_URL: `${issuer}${tokenPath}?`,
-      ACTIONS_ID_TOKEN_REQUEST_URL: tokenURL,
+      ACTIONS_ID_TOKEN_REQUEST_TOKEN: 'token',
-      ACTIONS_ID_TOKEN_REQUEST_TOKEN: 'token'
+      GITHUB_SERVER_URL: 'https://github.com',
+      GITHUB_REPOSITORY: claims.repository
     }
+
+    // Generate JWT signing key
+    const key = await jose.generateKeyPair('PS256')
+
+    // Create JWK, JWKS, and JWT
+    const jwk = await jose.exportJWK(key.publicKey)
+    const jwks = {keys: [jwk]}
+    const jwt = await new jose.SignJWT(claims)
+      .setProtectedHeader({alg: 'PS256'})
+      .sign(key.privateKey)
+
+    // Mock OpenID configuration and JWKS endpoints
+    nock(issuer)
+      .get('/.well-known/openid-configuration')
+      .reply(200, {jwks_uri: `${issuer}${jwksPath}`})
+    nock(issuer).get(jwksPath).reply(200, jwks)
+
+    // Mock OIDC token endpoint for populating the provenance
+    nock(issuer).get(tokenPath).query({audience}).reply(200, {value: jwt})
   })
 
   afterEach(() => {
-    // Restore the original environment
     process.env = originalEnv
   })
 
-  describe('when using the github Sigstore instance', () => {
+  describe('buildSLSAProvenancePredicate', () => {
-    const {fulcioURL, tsaServerURL} = SIGSTORE_GITHUB
+    it('returns a provenance hydrated from an OIDC token', async () => {
-
+      const predicate = await buildSLSAProvenancePredicate(issuer)
-    beforeEach(async () => {
+      expect(predicate).toMatchSnapshot()
-      // Mock Sigstore
-      await mockFulcio({baseURL: fulcioURL, strict: false})
-      await mockTSA({baseURL: tsaServerURL})
-
-      // Mock GH attestations API
-      nock('https://api.github.com')
-        .post(/^\/repos\/.*\/.*\/attestations$/)
-        .reply(201, {id: attestationID})
-    })
-
-    describe('when the sigstore instance is explicitly set', () => {
-      it('attests provenance', async () => {
-        const attestation = await attestProvenance({
-          subjectName,
-          subjectDigest,
-          token: 'token',
-          sigstore: 'github'
-        })
-
-        expect(attestation).toBeDefined()
-        expect(attestation.bundle).toBeDefined()
-        expect(attestation.certificate).toMatch(/-----BEGIN CERTIFICATE-----/)
-        expect(attestation.tlogID).toBeUndefined()
-        expect(attestation.attestationID).toBe(attestationID)
-      })
-    })
-
-    describe('when the sigstore instance is inferred from the repo visibility', () => {
-      const savedRepository = github.context.payload.repository
-
-      beforeEach(() => {
-        /* eslint-disable-next-line @typescript-eslint/no-explicit-any */
-        github.context.payload.repository = {visibility: 'private'} as any
-      })
-
-      afterEach(() => {
-        github.context.payload.repository = savedRepository
-      })
-
-      it('attests provenance', async () => {
-        const attestation = await attestProvenance({
-          subjectName,
-          subjectDigest,
-          token: 'token'
-        })
-
-        expect(attestation).toBeDefined()
-        expect(attestation.bundle).toBeDefined()
-        expect(attestation.certificate).toMatch(/-----BEGIN CERTIFICATE-----/)
-        expect(attestation.tlogID).toBeUndefined()
-        expect(attestation.attestationID).toBe(attestationID)
-      })
     })
   })
 
-  describe('when using the public-good Sigstore instance', () => {
+  describe('attestProvenance', () => {
-    const {fulcioURL, rekorURL} = SIGSTORE_PUBLIC_GOOD
+    // Subject to attest
+    const subjectName = 'subjective'
+    const subjectDigest = {
+      sha256: '7d070f6b64d9bcc530fe99cc21eaaa4b3c364e0b2d367d7735671fa202a03b32'
+    }
+
+    // Fake an OIDC token
+    const oidcPayload = {sub: 'foo@bar.com', iss: ''}
+    const oidcToken = `.${Buffer.from(JSON.stringify(oidcPayload)).toString(
+      'base64'
+    )}.}`
+
+    const attestationID = '1234567890'
 
     beforeEach(async () => {
-      // Mock Sigstore
+      nock(issuer)
-      await mockFulcio({baseURL: fulcioURL, strict: false})
+        .get(tokenPath)
-      await mockRekor({baseURL: rekorURL})
+        .query({audience: 'sigstore'})
-
+        .reply(200, {value: oidcToken})
-      // Mock GH attestations API
-      nock('https://api.github.com')
-        .post(/^\/repos\/.*\/.*\/attestations$/)
-        .reply(201, {id: attestationID})
     })
 
-    describe('when the sigstore instance is explicitly set', () => {
+    describe('when using the github Sigstore instance', () => {
+      const {fulcioURL, tsaServerURL} = SIGSTORE_GITHUB
+
+      beforeEach(async () => {
+        // Mock Sigstore
+        await mockFulcio({baseURL: fulcioURL, strict: false})
+        await mockTSA({baseURL: tsaServerURL})
+
+        // Mock GH attestations API
+        nock('https://api.github.com')
+          .post(/^\/repos\/.*\/.*\/attestations$/)
+          .reply(201, {id: attestationID})
+      })
+
+      describe('when the sigstore instance is explicitly set', () => {
+        it('attests provenance', async () => {
+          const attestation = await attestProvenance({
+            subjectName,
+            subjectDigest,
+            token: 'token',
+            sigstore: 'github',
+            issuer
+          })
+
+          expect(attestation).toBeDefined()
+          expect(attestation.bundle).toBeDefined()
+          expect(attestation.certificate).toMatch(/-----BEGIN CERTIFICATE-----/)
+          expect(attestation.tlogID).toBeUndefined()
+          expect(attestation.attestationID).toBe(attestationID)
+        })
+      })
+
+      describe('when the sigstore instance is inferred from the repo visibility', () => {
+        const savedRepository = github.context.payload.repository
+
+        beforeEach(() => {
+          /* eslint-disable-next-line @typescript-eslint/no-explicit-any */
+          github.context.payload.repository = {visibility: 'private'} as any
+        })
+
+        afterEach(() => {
+          github.context.payload.repository = savedRepository
+        })
+
+        it('attests provenance', async () => {
+          const attestation = await attestProvenance({
+            subjectName,
+            subjectDigest,
+            token: 'token',
+            issuer
+          })
+
+          expect(attestation).toBeDefined()
+          expect(attestation.bundle).toBeDefined()
+          expect(attestation.certificate).toMatch(/-----BEGIN CERTIFICATE-----/)
+          expect(attestation.tlogID).toBeUndefined()
+          expect(attestation.attestationID).toBe(attestationID)
+        })
+      })
+    })
+
+    describe('when using the public-good Sigstore instance', () => {
+      const {fulcioURL, rekorURL} = SIGSTORE_PUBLIC_GOOD
+
+      beforeEach(async () => {
+        // Mock Sigstore
+        await mockFulcio({baseURL: fulcioURL, strict: false})
+        await mockRekor({baseURL: rekorURL})
+
+        // Mock GH attestations API
+        nock('https://api.github.com')
+          .post(/^\/repos\/.*\/.*\/attestations$/)
+          .reply(201, {id: attestationID})
+      })
+
+      describe('when the sigstore instance is explicitly set', () => {
+        it('attests provenance', async () => {
+          const attestation = await attestProvenance({
+            subjectName,
+            subjectDigest,
+            token: 'token',
+            sigstore: 'public-good',
+            issuer
+          })
+
+          expect(attestation).toBeDefined()
+          expect(attestation.bundle).toBeDefined()
+          expect(attestation.certificate).toMatch(/-----BEGIN CERTIFICATE-----/)
+          expect(attestation.tlogID).toBeDefined()
+          expect(attestation.attestationID).toBe(attestationID)
+        })
+      })
+
+      describe('when the sigstore instance is inferred from the repo visibility', () => {
+        const savedRepository = github.context.payload.repository
+
+        beforeEach(() => {
+          /* eslint-disable-next-line @typescript-eslint/no-explicit-any */
+          github.context.payload.repository = {visibility: 'public'} as any
+        })
+
+        afterEach(() => {
+          github.context.payload.repository = savedRepository
+        })
+
+        it('attests provenance', async () => {
+          const attestation = await attestProvenance({
+            subjectName,
+            subjectDigest,
+            token: 'token',
+            issuer
+          })
+
+          expect(attestation).toBeDefined()
+          expect(attestation.bundle).toBeDefined()
+          expect(attestation.certificate).toMatch(/-----BEGIN CERTIFICATE-----/)
+          expect(attestation.tlogID).toBeDefined()
+          expect(attestation.attestationID).toBe(attestationID)
+        })
+      })
+    })
+
+    describe('when skipWrite is set to true', () => {
+      const {fulcioURL, rekorURL} = SIGSTORE_PUBLIC_GOOD
+      beforeEach(async () => {
+        // Mock Sigstore
+        await mockFulcio({baseURL: fulcioURL, strict: false})
+        await mockRekor({baseURL: rekorURL})
+      })
+
       it('attests provenance', async () => {
         const attestation = await attestProvenance({
           subjectName,
           subjectDigest,
           token: 'token',
-          sigstore: 'public-good'
+          sigstore: 'public-good',
+          skipWrite: true,
+          issuer
         })
 
         expect(attestation).toBeDefined()
         expect(attestation.bundle).toBeDefined()
         expect(attestation.certificate).toMatch(/-----BEGIN CERTIFICATE-----/)
         expect(attestation.tlogID).toBeDefined()
-        expect(attestation.attestationID).toBe(attestationID)
+        expect(attestation.attestationID).toBeUndefined()
       })
     })
-
-    describe('when the sigstore instance is inferred from the repo visibility', () => {
-      const savedRepository = github.context.payload.repository
-
-      beforeEach(() => {
-        /* eslint-disable-next-line @typescript-eslint/no-explicit-any */
-        github.context.payload.repository = {visibility: 'public'} as any
-      })
-
-      afterEach(() => {
-        github.context.payload.repository = savedRepository
-      })
-
-      it('attests provenance', async () => {
-        const attestation = await attestProvenance({
-          subjectName,
-          subjectDigest,
-          token: 'token'
-        })
-
-        expect(attestation).toBeDefined()
-        expect(attestation.bundle).toBeDefined()
-        expect(attestation.certificate).toMatch(/-----BEGIN CERTIFICATE-----/)
-        expect(attestation.tlogID).toBeDefined()
-        expect(attestation.attestationID).toBe(attestationID)
-      })
-    })
-  })
-
-  describe('when skipWrite is set to true', () => {
-    const {fulcioURL, rekorURL} = SIGSTORE_PUBLIC_GOOD
-    beforeEach(async () => {
-      // Mock Sigstore
-      await mockFulcio({baseURL: fulcioURL, strict: false})
-      await mockRekor({baseURL: rekorURL})
-    })
-
-    it('attests provenance', async () => {
-      const attestation = await attestProvenance({
-        subjectName,
-        subjectDigest,
-        token: 'token',
-        sigstore: 'public-good',
-        skipWrite: true
-      })
-
-      expect(attestation).toBeDefined()
-      expect(attestation.bundle).toBeDefined()
-      expect(attestation.certificate).toMatch(/-----BEGIN CERTIFICATE-----/)
-      expect(attestation.tlogID).toBeDefined()
-      expect(attestation.attestationID).toBeUndefined()
-    })
   })
 })

packages/attest/__tests__/store.test.ts

@@ -38,7 +38,7 @@ describe('writeAttestation', () => {
         .reply(500, 'oops')
     })
 
-    it('persists the attestation', async () => {
+    it('throws an error', async () => {
       await expect(writeAttestation(attestation, token)).rejects.toThrow(/oops/)
     })
   })

packages/attest/package-lock.json

@@ -9,18 +9,33 @@
       "version": "1.0.0",
       "license": "MIT",
       "dependencies": {
+        "@actions/core": "^1.10.1",
         "@actions/github": "^6.0.0",
+        "@actions/http-client": "^2.2.1",
         "@sigstore/bundle": "^2.2.0",
         "@sigstore/sign": "^2.2.3",
+        "jsonwebtoken": "^9.0.2",
+        "jwks-rsa": "^3.1.0",
         "make-fetch-happen": "^13.0.0"
       },
       "devDependencies": {
         "@sigstore/mock": "^0.6.5",
         "@sigstore/rekor-types": "^2.0.0",
+        "@types/jsonwebtoken": "^9.0.6",
         "@types/make-fetch-happen": "^10.0.4",
+        "jose": "^5.2.3",
         "nock": "^13.5.1"
       }
     },
+    "node_modules/@actions/core": {
+      "version": "1.10.1",
+      "resolved": "https://registry.npmjs.org/@actions/core/-/core-1.10.1.tgz",
+      "integrity": "sha512-3lBR9EDAY+iYIpTnTIXmWcNbX3T2kCkAEQGIQx4NVQ0575nk2k3GRZDTPQG+vVtS2izSLmINlxXf0uLtnrTP+g==",
+      "dependencies": {
+        "@actions/http-client": "^2.0.1",
+        "uuid": "^8.3.2"
+      }
+    },
     "node_modules/@actions/github": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/@actions/github/-/github-6.0.0.tgz",
@@ -33,9 +48,9 @@
       }
     },
     "node_modules/@actions/http-client": {
-      "version": "2.2.0",
+      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-2.2.0.tgz",
+      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-2.2.1.tgz",
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@@ -2948,6 +3466,11 @@
       "resolved": "https://registry.npmjs.org/universal-user-agent/-/universal-user-agent-6.0.1.tgz",
       "integrity": "sha512-yCzhz6FN2wU1NiiQRogkTQszlQSlpWaw8SvVegAc+bDxbzHgh1vX8uIe8OYyMH6DwH+sdTJsgMl36+mSMdRJIQ=="
     },
+    "uuid": {
+      "version": "8.3.2",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
+      "integrity": "sha512-+NYs2QeMWy+GWFOEm9xnn6HCDp0l7QBD7ml8zLUmJ+93Q5NF0NocErnwkTkXVFNiX3/fpC6afS8Dhb/gz7R7eg=="
+    },
     "webcrypto-core": {
       "version": "1.7.8",
       "resolved": "https://registry.npmjs.org/webcrypto-core/-/webcrypto-core-1.7.8.tgz",

packages/attest/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@actions/attest",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "Actions attestation lib",
   "keywords": [
     "github",
@@ -37,13 +37,19 @@
   "devDependencies": {
     "@sigstore/mock": "^0.6.5",
     "@sigstore/rekor-types": "^2.0.0",
+    "@types/jsonwebtoken": "^9.0.6",
     "@types/make-fetch-happen": "^10.0.4",
+    "jose": "^5.2.3",
     "nock": "^13.5.1"
   },
   "dependencies": {
+    "@actions/core": "^1.10.1",
     "@actions/github": "^6.0.0",
+    "@actions/http-client": "^2.2.1",
     "@sigstore/bundle": "^2.2.0",
     "@sigstore/sign": "^2.2.3",
+    "jsonwebtoken": "^9.0.2",
+    "jwks-rsa": "^3.1.0",
     "make-fetch-happen": "^13.0.0"
   }
 }

packages/attest/src/oidc.ts

@@ -0,0 +1,102 @@
+import {getIDToken} from '@actions/core'
+import {HttpClient} from '@actions/http-client'
+import * as jwt from 'jsonwebtoken'
+import jwks from 'jwks-rsa'
+
+const OIDC_AUDIENCE = 'nobody'
+
+const REQUIRED_CLAIMS = [
+  'iss',
+  'ref',
+  'sha',
+  'repository',
+  'event_name',
+  'workflow_ref',
+  'repository_id',
+  'repository_owner_id',
+  'runner_environment',
+  'run_id',
+  'run_attempt'
+] as const
+
+export type ClaimSet = {[K in (typeof REQUIRED_CLAIMS)[number]]: string}
+
+type OIDCConfig = {
+  jwks_uri: string
+}
+
+export const getIDTokenClaims = async (issuer: string): Promise<ClaimSet> => {
+  try {
+    const token = await getIDToken(OIDC_AUDIENCE)
+    const claims = await decodeOIDCToken(token, issuer)
+    assertClaimSet(claims)
+    return claims
+  } catch (error) {
+    throw new Error(`Failed to get ID token: ${error.message}`)
+  }
+}
+
+const decodeOIDCToken = async (
+  token: string,
+  issuer: string
+): Promise<jwt.JwtPayload> => {
+  // Verify and decode token
+  return new Promise((resolve, reject) => {
+    jwt.verify(
+      token,
+      getPublicKey(issuer),
+      {audience: OIDC_AUDIENCE, issuer},
+      (err, decoded) => {
+        if (err) {
+          reject(err)
+        } else if (!decoded || typeof decoded === 'string') {
+          reject(new Error('No decoded token'))
+        } else {
+          resolve(decoded)
+        }
+      }
+    )
+  })
+}
+
+// Returns a callback to locate the public key for the given JWT header. This
+// involves two calls:
+// 1. Fetch the OpenID configuration to get the JWKS URI.
+// 2. Fetch the public key from the JWKS URI.
+const getPublicKey =
+  (issuer: string): jwt.GetPublicKeyOrSecret =>
+  (header: jwt.JwtHeader, callback: jwt.SigningKeyCallback) => {
+    // Look up the JWKS URI from the issuer's OpenID configuration
+    new HttpClient('actions/attest')
+      .getJson<OIDCConfig>(`${issuer}/.well-known/openid-configuration`)
+      .then(data => {
+        if (!data.result) {
+          callback(new Error('No OpenID configuration found'))
+        } else {
+          // Fetch the public key from the JWKS URI
+          jwks({jwksUri: data.result.jwks_uri}).getSigningKey(
+            header.kid,
+            (err, key) => {
+              callback(err, key?.getPublicKey())
+            }
+          )
+        }
+      })
+      .catch(err => {
+        callback(err)
+      })
+  }
+
+function assertClaimSet(claims: jwt.JwtPayload): asserts claims is ClaimSet {
+  const missingClaims: string[] = []
+
+  for (const claim of REQUIRED_CLAIMS) {
+    if (!(claim in claims)) {
+      missingClaims.push(claim)
+    }
+  }
+
+  if (missingClaims.length > 0) {
+    throw new Error(`Missing claims: ${missingClaims.join(', ')}`)
+  }
+}

packages/attest/src/provenance.ts

@@ -1,4 +1,5 @@
 import {attest, AttestOptions} from './attest'
+import {getIDTokenClaims} from './oidc'
 import type {Attestation, Predicate} from './shared.types'
 
 const SLSA_PREDICATE_V1_TYPE = 'https://slsa.dev/provenance/v1'
@@ -7,30 +8,35 @@ const GITHUB_BUILDER_ID_PREFIX = 'https://github.com/actions/runner'
 const GITHUB_BUILD_TYPE =
   'https://slsa-framework.github.io/github-actions-buildtypes/workflow/v1'
 
+const DEFAULT_ISSUER = 'https://token.actions.githubusercontent.com'
+
 export type AttestProvenanceOptions = Omit<
   AttestOptions,
   'predicate' | 'predicateType'
->
+> & {
+  issuer?: string
+}
 
 /**
  * Builds an SLSA (Supply Chain Levels for Software Artifacts) provenance
  * predicate using the GitHub Actions Workflow build type.
  * https://slsa.dev/spec/v1.0/provenance
  * https://github.com/slsa-framework/github-actions-buildtypes/tree/main/workflow/v1
- * @param env - The Node.js process environment variables. Defaults to
+ * @param issuer - URL for the OIDC issuer. Defaults to the GitHub Actions token
- * `process.env`.
+ * issuer.
  * @returns The SLSA provenance predicate.
  */
-export const buildSLSAProvenancePredicate = (
+export const buildSLSAProvenancePredicate = async (
-  env: NodeJS.ProcessEnv = process.env
+  issuer: string = DEFAULT_ISSUER
-): Predicate => {
+): Promise<Predicate> => {
-  const workflow = env.GITHUB_WORKFLOW_REF || ''
+  const serverURL = process.env.GITHUB_SERVER_URL
+  const claims = await getIDTokenClaims(issuer)
 
   // Split just the path and ref from the workflow string.
   // owner/repo/.github/workflows/main.yml@main =>
   //   .github/workflows/main.yml, main
-  const [workflowPath, workflowRef] = workflow
+  const [workflowPath, workflowRef] = claims.workflow_ref
-    .replace(`${env.GITHUB_REPOSITORY}/`, '')
+    .replace(`${claims.repository}/`, '')
     .split('@')
 
   return {
@@ -41,32 +47,32 @@ export const buildSLSAProvenancePredicate = (
         externalParameters: {
           workflow: {
             ref: workflowRef,
-            repository: `${env.GITHUB_SERVER_URL}/${env.GITHUB_REPOSITORY}`,
+            repository: `${serverURL}/${claims.repository}`,
             path: workflowPath
           }
         },
         internalParameters: {
           github: {
-            event_name: env.GITHUB_EVENT_NAME,
+            event_name: claims.event_name,
-            repository_id: env.GITHUB_REPOSITORY_ID,
+            repository_id: claims.repository_id,
-            repository_owner_id: env.GITHUB_REPOSITORY_OWNER_ID
+            repository_owner_id: claims.repository_owner_id
           }
         },
         resolvedDependencies: [
           {
-            uri: `git+${env.GITHUB_SERVER_URL}/${env.GITHUB_REPOSITORY}@${env.GITHUB_REF}`,
+            uri: `git+${serverURL}/${claims.repository}@${claims.ref}`,
             digest: {
-              gitCommit: env.GITHUB_SHA
+              gitCommit: claims.sha
             }
           }
         ]
       },
       runDetails: {
         builder: {
-          id: `${GITHUB_BUILDER_ID_PREFIX}/${env.RUNNER_ENVIRONMENT}`
+          id: `${GITHUB_BUILDER_ID_PREFIX}/${claims.runner_environment}`
         },
         metadata: {
-          invocationId: `${env.GITHUB_SERVER_URL}/${env.GITHUB_REPOSITORY}/actions/runs/${env.GITHUB_RUN_ID}/attempts/${env.GITHUB_RUN_ATTEMPT}`
+          invocationId: `${serverURL}/${claims.repository}/actions/runs/${claims.run_id}/attempts/${claims.run_attempt}`
         }
       }
     }
@@ -84,7 +90,7 @@ export const buildSLSAProvenancePredicate = (
 export async function attestProvenance(
   options: AttestProvenanceOptions
 ): Promise<Attestation> {
-  const predicate = buildSLSAProvenancePredicate(process.env)
+  const predicate = await buildSLSAProvenancePredicate(options.issuer)
   return attest({
     ...options,
     predicateType: predicate.type,