Sign Bundle with a Timestamp Authority (#1216)

Co-authored-by: Facundo Tuesca <facu@tuesca.com>
Co-authored-by: William Woodruff <william@yossarian.net>
Co-authored-by: William Woodruff <william@trailofbits.com>

Author: 3 people

.github/workflows/ci.yml

@@ -58,6 +58,21 @@ jobs:
       - name: test
         run: make test TEST_ARGS="-vv --showlocals"
 
+      - name: test (timestamp-authority)
+        if: ${{ matrix.conf.os == 'ubuntu-latest' }}
+        run: |
+          wget https://github.com/sigstore/timestamp-authority/releases/download/${SIGSTORE_TIMESTAMP}/timestamp-server-linux-amd64 -O /tmp/timestamp-server
+          chmod +x /tmp/timestamp-server
+          # Run the TSA in background
+          /tmp/timestamp-server serve --port 3000 --disable-ntp-monitoring &
+          export TEST_SIGSTORE_TIMESTAMP_AUTHORITY_URL="http://localhost:3000/api/v1/timestamp"
+          # Ensure Timestamp Authority tests are not skipped by
+          # having pytest show skipped tests and verifying ours are running
+          make test TEST_ARGS="-m timestamp_authority -rs" | tee output
+          ! grep -q "skipping test that requires a Timestamp Authority" output || (echo "ERROR: Found skip message" && exit 1)
+        env:
+          SIGSTORE_TIMESTAMP: "v1.2.3"
+
       - name: test (interactive)
         if: (github.event_name != 'pull_request') || !github.event.pull_request.head.repo.fork
         run: make test-interactive TEST_ARGS="-vv --showlocals"

sigstore/_internal/timestamp.py

@@ -20,6 +20,17 @@
 from dataclasses import dataclass
 from datetime import datetime
 
+import requests
+from rfc3161_client import (
+    TimestampRequestBuilder,
+    TimeStampResponse,
+    decode_timestamp_response,
+)
+
+from sigstore._internal import USER_AGENT
+
+CLIENT_TIMEOUT: int = 5
+
 
 class TimestampSource(enum.Enum):
     """Represents the source of a timestamp."""
@@ -38,3 +49,73 @@ class TimestampVerificationResult:
 
     source: TimestampSource
     time: datetime
+
+
+class TimestampError(Exception):
+    """
+    A generic error in the TimestampAuthority client.
+    """
+
+    pass
+
+
+class TimestampAuthorityClient:
+    """Internal client to deal with a Timestamp Authority"""
+
+    def __init__(self, url: str) -> None:
+        """
+        Create a new `TimestampAuthorityClient` from the given URL.
+        """
+        self.url = url
+        self.session = requests.Session()
+        self.session.headers.update(
+            {
+                "Content-Type": "application/timestamp-query",
+                "User-Agent": USER_AGENT,
+            }
+        )
+
+    def __del__(self) -> None:
+        """
+        Terminates the underlying network session.
+        """
+        self.session.close()
+
+    def request_timestamp(self, signature: bytes) -> TimeStampResponse:
+        """
+        Timestamp the signature using the configured Timestamp Authority.
+
+        This method generates a RFC3161 Timestamp Request and sends it to a TSA.
+        The received response is parsed but *not* cryptographically verified.
+
+        Raises a TimestampError on failure.
+        """
+        # Build the timestamp request
+        try:
+            timestamp_request = (
+                TimestampRequestBuilder().data(signature).nonce(nonce=True).build()
+            )
+        except ValueError as error:
+            msg = f"invalid request: {error}"
+            raise TimestampError(msg)
+
+        # Send it to the TSA for signing
+        try:
+            response = self.session.post(
+                self.url,
+                data=timestamp_request.as_bytes(),
+                timeout=CLIENT_TIMEOUT,
+            )
+            response.raise_for_status()
+        except requests.RequestException as error:
+            msg = f"error while sending the request to the TSA: {error}"
+            raise TimestampError(msg)
+
+        # Check that we can parse the response but do not *verify* it
+        try:
+            timestamp_response = decode_timestamp_response(response.content)
+        except ValueError as e:
+            msg = f"invalid response: {e}"
+            raise TimestampError(msg)
+
+        return timestamp_response

sigstore/models.py

@@ -55,6 +55,7 @@
     VerificationMaterial as _VerificationMaterial,
 )
 from sigstore_protobuf_specs.dev.sigstore.common import v1 as common_v1
+from sigstore_protobuf_specs.dev.sigstore.common.v1 import Rfc3161SignedTimestamp
 from sigstore_protobuf_specs.dev.sigstore.rekor import v1 as rekor_v1
 from sigstore_protobuf_specs.dev.sigstore.rekor.v1 import (
     InclusionProof,
@@ -635,6 +636,7 @@ def _from_parts(
         cert: Certificate,
         content: common_v1.MessageSignature | dsse.Envelope,
         log_entry: LogEntry,
+        signed_timestamp: Optional[List[TimeStampResponse]] = None,
     ) -> Bundle:
         """
         @private
@@ -656,4 +658,14 @@ def _from_parts(
         tlog_entry = log_entry._to_rekor()
         inner.verification_material.tlog_entries = [tlog_entry]
 
+        if signed_timestamp is not None:
+            inner.verification_material.timestamp_verification_data = (
+                bundle_v1.TimestampVerificationData(
+                    rfc3161_timestamps=[
+                        Rfc3161SignedTimestamp(signed_timestamp=response.as_bytes())
+                        for response in signed_timestamp
+                    ]
+                )
+            )
+
         return cls(inner)

sigstore/sign.py

@@ -42,7 +42,7 @@
 import logging
 from contextlib import contextmanager
 from datetime import datetime, timezone
-from typing import Iterator, Optional
+from typing import Iterator, List, Optional
 
 import cryptography.x509 as x509
 import rekor_types
@@ -62,6 +62,7 @@
 )
 from sigstore._internal.rekor.client import RekorClient
 from sigstore._internal.sct import verify_sct
+from sigstore._internal.timestamp import TimestampAuthorityClient, TimestampError
 from sigstore._internal.trust import ClientTrustConfig, KeyringPurpose, TrustedRoot
 from sigstore._utils import sha256_digest
 from sigstore.models import Bundle
@@ -190,7 +191,17 @@ def _finalize_sign(
 
         _logger.debug(f"Transparency log entry created with index: {entry.log_index}")
 
-        return Bundle._from_parts(cert, content, entry)
+        # If the user provided TSA urls, timestamps the response
+        signed_timestamp = []
+        for tsa_client in self._signing_ctx._tsa_clients:
+            try:
+                signed_timestamp.append(tsa_client.request_timestamp(content.signature))
+            except TimestampError as e:
+                _logger.warning(
+                    f"Unable to use {tsa_client.url} to timestamp the bundle. Failed with {e}"
+                )
+
+        return Bundle._from_parts(cert, content, entry, signed_timestamp)
 
     def sign_dsse(
         self,
@@ -296,7 +307,12 @@ class SigningContext:
     """
 
     def __init__(
-        self, *, fulcio: FulcioClient, rekor: RekorClient, trusted_root: TrustedRoot
+        self,
+        *,
+        fulcio: FulcioClient,
+        rekor: RekorClient,
+        trusted_root: TrustedRoot,
+        tsa_clients: List[TimestampAuthorityClient] | None = None,
     ):
         """
         Create a new `SigningContext`.
@@ -310,6 +326,7 @@ def __init__(
         self._fulcio = fulcio
         self._rekor = rekor
         self._trusted_root = trusted_root
+        self._tsa_clients = tsa_clients or []
 
     @classmethod
     def production(cls) -> SigningContext:
@@ -344,6 +361,10 @@ def _from_trust_config(cls, trust_config: ClientTrustConfig) -> SigningContext:
             fulcio=FulcioClient(trust_config._inner.signing_config.ca_url),
             rekor=RekorClient(trust_config._inner.signing_config.tlog_urls[0]),
             trusted_root=trust_config.trusted_root,
+            tsa_clients=[
+                TimestampAuthorityClient(tsa_url)
+                for tsa_url in trust_config._inner.signing_config.tsa_urls
+            ],
         )
 
     @contextmanager

sigstore/verify/verifier.py

@@ -178,11 +178,11 @@ def _verify_timestamp_authority(
             bundle.verification_material.timestamp_verification_data.rfc3161_timestamps
         )
         if len(timestamp_responses) > MAX_ALLOWED_TIMESTAMP:
-            msg = f"Too many signed timestamp: {len(timestamp_responses)} > {MAX_ALLOWED_TIMESTAMP}"
+            msg = f"too many signed timestamp: {len(timestamp_responses)} > {MAX_ALLOWED_TIMESTAMP}"
             raise VerificationError(msg)
 
         if len(set(timestamp_responses)) != len(timestamp_responses):
-            msg = "Duplicate timestamp found"
+            msg = "duplicate timestamp found"
             raise VerificationError(msg)
 
         # The Signer sends a hash of the signature as the messageImprint in a TimeStampReq

test/assets/tsa/trust_config.json

@@ -0,0 +1,124 @@
+{
+  "mediaType": "application/vnd.dev.sigstore.clienttrustconfig.v0.1+json",
+  "trustedRoot": {
+    "mediaType": "application/vnd.dev.sigstore.trustedroot+json;version=0.1",
+    "tlogs": [
+      {
+        "baseUrl": "https://rekor.sigstage.dev",
+        "hashAlgorithm": "SHA2_256",
+        "publicKey": {
+          "rawBytes": "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEDODRU688UYGuy54mNUlaEBiQdTE9nYLr0lg6RXowI/QV/RE1azBn4Eg5/2uTOMbhB1/gfcHzijzFi9Tk+g1Prg==",
+          "keyDetails": "PKIX_ECDSA_P256_SHA_256",
+          "validFor": {
+            "start": "2021-01-12T11:53:27.000Z"
+          }
+        },
+        "logId": {
+          "keyId": "0y8wo8MtY5wrdiIFohx7sHeI5oKDpK5vQhGHI6G+pJY="
+        }
+      }
+    ],
+    "certificateAuthorities": [
+      {
+        "subject": {
+          "organization": "sigstore.dev",
+          "commonName": "sigstore"
+        },
+        "uri": "https://fulcio.sigstage.dev",
+        "certChain": {
+          "certificates": [
+            {
+              "rawBytes": "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"
+            },
+            {
+              "rawBytes": "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"
+            }
+          ]
+        },
+        "validFor": {
+          "start": "2022-04-14T21:38:40.000Z"
+        }
+      }
+    ],
+    "timestampAuthorities": [
+      {
+        "subject": {
+          "organization": "local",
+          "commonName": "Test TSA Timestamping"
+        },
+        "certChain": {
+          "certificates": [
+            {
+              "rawBytes": "MIIFRTCCAy2gAwIBAgIUCmn2Vl7XF50OeM7Y1oM/vFAFK3kwDQYJKoZIhvcNAQELBQAwMDEeMBwGA1UEAwwVVGVzdCBUU0EgSW50ZXJtZWRpYXRlMQ4wDAYDVQQKDAVsb2NhbDAeFw0yNDExMDcxNDU5NDBaFw0zMzExMDUxNDU5NDBaMDAxHjAcBgNVBAMMFVRlc3QgVFNBIFRpbWVzdGFtcGluZzEOMAwGA1UECgwFbG9jYWwwggIiMA0GCSqGSIb3DQEBAQUAA4ICDwAwggIKAoICAQDiSD0m8J8ZGMS/Et2SqooLUCpwiAX9Ay/KOYCMFXr6ujAKOZGPQgASY7kdB1zA+dkHmoOxbF8kASVoFlwYzgnAvH9YpiVT9iVCRgF/sAutbdHYmOtPLpyB15PPiwnxB/PIk1d6e/WOh0Vn2ZX0juVJKb2B59FpzG1CXn9WGT7C1qVpXM+UtdRxxpug/lLBeDle5Uo/ffxGZfy5FsdlXTCFzkiqjf0cEIIxoEHxhOjxGjt2pPDuq7PLV0N0AWIhu7FU29fUePsS6TTk+8OS2Z8XQn8YHmgQMgqJF4fsv0ytTsNv5qPV2NEUi9Em7IemFFnfW5HktazmrqF7Ly/YPVv35X9zgT898YAVgd0+PaUqVgWEWv/hpV6kmXoNTxCcMqixbNQGxVWT9N5EMBZgc9yXesKFpHIb7cF/diloytxBOvnwm9PShBz6/KOfq17WPvOqK1UC4fMmdzppaXDuhOa4GhNoPUeo646oMFafpSoR1HG6Fom71oIxJ8Q63IxAFRdoKyioBlTuPDFXgIk3Ckv3+PVkJIl1imF33tnYut5OF+pMbrlf4I2Op4+n0CDsmRg9BBQBxIXoP2ziRIputnISW7uS55ViTkfO7mZRBIJzz2ZqX9igCkTvA1wMZzLeRbow2tkwRaTHYg4uQTGJuWMAkJRz27FjswVu1dIC27g7uQIDAQABo1cwVTAMBgNVHRMBAf8EAjAAMA4GA1UdDwEB/wQEAwIHgDAWBgNVHSUBAf8EDDAKBggrBgEFBQcDCDAdBgNVHQ4EFgQU6LppB2yaoGV18BzPLiq5NGHTecwwDQYJKoZIhvcNAQELBQADggIBAOAZhkQF9aC5oUA2cXtBRoYoXnPILrbdIvVQvfe3IOUAhF5QvjrVwtBffR8ZxrSSn/8t0rtXy6BZQas95YD0ObspemMocKSsPYo01qnuCX5757LSvTpYPERVt6TpKVV39Y59xlmuUjlyQH0Ufrsh8Qs8ejPQwDUWmDwetBnrZfDV36AgCAjlS3QSQQt+iYb6x13jYGZ9Wj/HUqSaUlJqqtuzbbIMZy8FSHLjle5m2Np2Wubwn3a3z+xTYVN+gWDFWtEamDprRxQ6oswXmINv8cZd79cMZbFS7j2Crnni58uVLxMQAcSNBEnQTChTdD6JzUjHiSzpaSTn/txfP9M/rMTSDokqPgfhpWcB93sw0X5Inv2nsqMN6U8b28F0+ciBP7dKVPTM8ypfVpAJ0OtGijkGda6cfYbcXCTTMZFAnMPenfVMN9TtljZ/lOdaNLuaRVKcOJvrHLqv4Mau+9TPkd8Xn5YWVCxtYr/xhKdaHfQ2KGr987CP6hKoIAPPIebQWjd1jrrlm1ESebcm1pGTWiNyGhKUUaFsKt96xmtGa3ov3OfcygSDGdPAIy5LlWyfdEX9rwoqTi+s6EELabj2C6ICCUYwqr6quaQrvhdJ84Oqs5Tn3hkcrroJtLPQBtYNGjHZtJLyXZ/wEAUciWTSyLinVABhBdXzTlUnwO9wkxdx"
+            },
+            {
+              "rawBytes": "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"
+            },
+            {
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+            }
+          ]
+        },
+        "validFor": {
+          "start": "2024-11-07T14:59:40.000Z",
+          "end": "2033-11-05T14:59:40.000Z"
+        }
+      }
+    ],
+    "ctlogs": [
+      {
+        "baseUrl": "https://ctfe.sigstage.dev/test",
+        "hashAlgorithm": "SHA2_256",
+        "publicKey": {
+          "rawBytes": "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",
+          "keyDetails": "PKCS1_RSA_PKCS1V5",
+          "validFor": {
+            "start": "2021-03-14T00:00:00.000Z",
+            "end": "2022-07-31T00:00:00.000Z"
+          }
+        },
+        "logId": {
+          "keyId": "G3wUKk6ZK6ffHh/FdCRUE2wVekyzHEEIpSG4savnv0w="
+        }
+      },
+      {
+        "baseUrl": "https://ctfe.sigstage.dev/2022",
+        "hashAlgorithm": "SHA2_256",
+        "publicKey": {
+          "rawBytes": "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEh99xuRi6slBFd8VUJoK/rLigy4bYeSYWO/fE6Br7r0D8NpMI94+A63LR/WvLxpUUGBpY8IJA3iU2telag5CRpA==",
+          "keyDetails": "PKIX_ECDSA_P256_SHA_256",
+          "validFor": {
+            "start": "2022-07-01T00:00:00.000Z",
+            "end": "2022-07-31T00:00:00.000Z"
+          }
+        },
+        "logId": {
+          "keyId": "++JKOMQt7SJ3ynUHnCfnDhcKP8/58J4TueMqXuk3HmA="
+        }
+      },
+      {
+        "baseUrl": "https://ctfe.sigstage.dev/2022-2",
+        "hashAlgorithm": "SHA2_256",
+        "publicKey": {
+          "rawBytes": "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE8gEDKNme8AnXuPBgHjrtXdS6miHqc24CRblNEOFpiJRngeq8Ko73Y+K18yRYVf1DXD4AVLwvKyzdNdl5n0jUSQ==",
+          "keyDetails": "PKIX_ECDSA_P256_SHA_256",
+          "validFor": {
+            "start": "2022-07-01T00:00:00.000Z"
+          }
+        },
+        "logId": {
+          "keyId": "KzC83GiIyeLh2CYpXnQfSDkxlgLynDPLXkNA/rKshno="
+        }
+      }
+    ]
+  },
+  "signing_config": {
+    "ca_url": "https://fulcio.sigstage.dev",
+    "tlog_urls": [
+      "https://rekor.sigstage.dev"
+    ],
+    "tsa_urls": [
+      "placeholder-value"
+    ]
+  }
+}