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Test the trusted metadata chain with DSSE envelopes #3032

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60 changes: 60 additions & 0 deletions tests/test_trusted_metadata_set.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,9 +15,11 @@
from securesystemslib.signer import Signer

from tests import utils
from tests.repository_simulator import RepositorySimulator
from tuf.api import exceptions
from tuf.api.dsse import SimpleEnvelope
from tuf.api.metadata import (
DelegatedRole,
Metadata,
MetaFile,
Root,
Expand Down Expand Up @@ -560,6 +562,64 @@ def test_load_from_simple_envelope(self) -> None:
with self.assertRaises(exceptions.RepositoryError):
_load_from_simple_envelope(Targets, envelope_bad_signed_bytes)

def test_update_with_simple_envelopes(self) -> None:
"""Verify DSSE envelopes through the complete trusted metadata chain."""
repository = RepositorySimulator()
repository.add_delegation(
Targets.type,
DelegatedRole("delegate", [], 1, False, paths=["*"]),
Targets(expires=repository.safe_expiry),
)
repository.add_target("delegate", b"target content", "target.txt")
repository.update_snapshot()

envelopes = {}
for role, metadata in {
Root.type: repository.md_root,
Timestamp.type: repository.md_timestamp,
Snapshot.type: repository.md_snapshot,
Targets.type: repository.md_targets,
"delegate": repository.md_delegates["delegate"],
}.items():
envelope = SimpleEnvelope.from_signed(metadata.signed)
for signer in repository.signers[role].values():
envelope.sign(signer)
envelopes[role] = envelope.to_bytes()

trusted = TrustedMetadataSet(envelopes[Root.type], EnvelopeType.SIMPLE)

# An unsigned timestamp must fail before any later role is trusted.
unsigned = SimpleEnvelope.from_signed(repository.timestamp)
with self.assertRaises(exceptions.UnsignedMetadataError):
trusted.update_timestamp(unsigned.to_bytes())
self.assertEqual(len(trusted), 1)
self.assertFalse(trusted.contains(Timestamp.type, Root.type))

trusted.update_timestamp(envelopes[Timestamp.type])
trusted.update_snapshot(envelopes[Snapshot.type])
trusted.update_targets(envelopes[Targets.type])
trusted.update_delegated_targets(
envelopes["delegate"], "delegate", Targets.type
)
self.assertEqual(len(trusted), 5)
self.assertTrue(trusted.contains("delegate", Targets.type))
target = trusted["delegate"].targets["target.txt"]
target.verify_length_and_hashes(b"target content")

# Changing the signed content must invalidate the delegated signature.
tampered = SimpleEnvelope.from_bytes(envelopes["delegate"])
tampered.payload = tampered.payload.replace(
b"target.txt", b"edited.txt"
)
fresh = TrustedMetadataSet(envelopes[Root.type], EnvelopeType.SIMPLE)
fresh.update_timestamp(envelopes[Timestamp.type])
fresh.update_snapshot(envelopes[Snapshot.type])
fresh.update_targets(envelopes[Targets.type])
with self.assertRaises(exceptions.UnsignedMetadataError):
fresh.update_delegated_targets(
tampered.to_bytes(), "delegate", Targets.type
)


if __name__ == "__main__":
utils.configure_test_logging(sys.argv)
Expand Down