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Hash the same content covered by the signature when referencing previous PDUs rather than reusing the PDU content hashes

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This commit is contained in:
Mark Haines 2014-10-17 11:40:35 +01:00
parent bb04447c44
commit c8f996e29f
6 changed files with 84 additions and 16 deletions
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19
synapse/crypto/event_signing.py
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@ -24,15 +24,15 @@ from syutil.crypto.jsonsign import sign_json, verify_signed_json
import hashlib
def hash_event_pdu(pdu, hash_algortithm=hashlib.sha256):
hashed = _compute_hash(pdu, hash_algortithm)
def add_event_pdu_content_hash(pdu, hash_algorithm=hashlib.sha256):
hashed = _compute_content_hash(pdu, hash_algorithm)
pdu.hashes[hashed.name] = encode_base64(hashed.digest())
return pdu
def check_event_pdu_hash(pdu, hash_algorithm=hashlib.sha256):
def check_event_pdu_content_hash(pdu, hash_algorithm=hashlib.sha256):
"""Check whether the hash for this PDU matches the contents"""
computed_hash = _compute_hash(pdu, hash_algortithm)
computed_hash = _compute_content_hash(pdu, hash_algortithm)
if computed_hash.name not in pdu.hashes:
raise Exception("Algorithm %s not in hashes %s" % (
computed_hash.name, list(pdu.hashes)
@ -45,7 +45,7 @@ def check_event_pdu_hash(pdu, hash_algorithm=hashlib.sha256):
return message_hash_bytes == computed_hash.digest()
def _compute_hash(pdu, hash_algorithm):
def _compute_content_hash(pdu, hash_algorithm):
pdu_json = pdu.get_dict()
pdu_json.pop("meta", None)
pdu_json.pop("signatures", None)
@ -54,6 +54,15 @@ def _compute_hash(pdu, hash_algorithm):
return hash_algorithm(pdu_json_bytes)
def compute_pdu_event_reference_hash(pdu, hash_algorithm=hashlib.sha256):
tmp_pdu = Pdu(**pdu.get_dict())
tmp_pdu = prune_pdu(tmp_pdu)
pdu_json = tmp_pdu.get_dict()
pdu_json_bytes = encode_canonical_json(pdu_json)
hashed = hash_algorithm(pdu_json_bytes)
return (hashed.name, hashed.digest())
def sign_event_pdu(pdu, signature_name, signing_key):
tmp_pdu = Pdu(**pdu.get_dict())
tmp_pdu = prune_pdu(tmp_pdu)

6
synapse/federation/pdu_codec.py
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@ -14,7 +14,9 @@
# limitations under the License.
from .units import Pdu
from synapse.crypto.event_signing import hash_event_pdu, sign_event_pdu
from synapse.crypto.event_signing import (
add_event_pdu_content_hash, sign_event_pdu
)
import copy
@ -97,5 +99,5 @@ class PduCodec(object):
kwargs["ts"] = int(self.clock.time_msec())
pdu = Pdu(**kwargs)
pdu = hash_event_pdu(pdu)
pdu = add_event_pdu_content_hash(pdu)
return sign_event_pdu(pdu, self.server_name, self.signing_key)

9
synapse/storage/__init__.py
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@ -44,6 +44,8 @@ from .signatures import SignatureStore
from syutil.base64util import decode_base64
from synapse.crypto.event_signing import compute_pdu_event_reference_hash
import json
import logging
import os
@ -165,7 +167,7 @@ class DataStore(RoomMemberStore, RoomStore,
for hash_alg, hash_base64 in pdu.hashes.items():
hash_bytes = decode_base64(hash_base64)
self._store_pdu_hash_txn(
self._store_pdu_content_hash_txn(
txn, pdu.pdu_id, pdu.origin, hash_alg, hash_bytes,
)
@ -185,6 +187,11 @@ class DataStore(RoomMemberStore, RoomStore,
hash_bytes
)
(ref_alg, ref_hash_bytes) = compute_pdu_event_reference_hash(pdu)
self._store_pdu_reference_hash_txn(
txn, pdu.pdu_id, pdu.origin, ref_alg, ref_hash_bytes
)
if pdu.is_state:
self._persist_state_txn(txn, pdu.prev_pdus, cols)
else:

4
synapse/storage/pdu.py
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@ -69,7 +69,7 @@ class PduStore(SQLBaseStore):
edge_hashes = self._get_prev_pdu_hashes_txn(txn, pdu_id, origin)
hashes = self._get_pdu_hashes_txn(txn, pdu_id, origin)
hashes = self._get_pdu_content_hashes_txn(txn, pdu_id, origin)
signatures = self._get_pdu_origin_signatures_txn(
txn, pdu_id, origin
)
@ -317,7 +317,7 @@ class PduStore(SQLBaseStore):
results = []
for pdu_id, origin, depth in txn.fetchall():
hashes = self._get_pdu_hashes_txn(txn, pdu_id, origin)
hashes = self._get_pdu_reference_hashes_txn(txn, pdu_id, origin)
sha256_bytes = hashes["sha256"]
prev_hashes = {"sha256": encode_base64(sha256_bytes)}
results.append((pdu_id, origin, prev_hashes, depth))

18
synapse/storage/schema/signatures.sql
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@ -13,7 +13,7 @@
* limitations under the License.
*/
CREATE TABLE IF NOT EXISTS pdu_hashes (
CREATE TABLE IF NOT EXISTS pdu_content_hashes (
pdu_id TEXT,
origin TEXT,
algorithm TEXT,
@ -21,7 +21,21 @@ CREATE TABLE IF NOT EXISTS pdu_hashes (
CONSTRAINT uniqueness UNIQUE (pdu_id, origin, algorithm)
);
CREATE INDEX IF NOT EXISTS pdu_hashes_id ON pdu_hashes (pdu_id, origin);
CREATE INDEX IF NOT EXISTS pdu_content_hashes_id ON pdu_content_hashes (
pdu_id, origin
);
CREATE TABLE IF NOT EXISTS pdu_reference_hashes (
pdu_id TEXT,
origin TEXT,
algorithm TEXT,
hash BLOB,
CONSTRAINT uniqueness UNIQUE (pdu_id, origin, algorithm)
);
CREATE INDEX IF NOT EXISTS pdu_reference_hashes_id ON pdu_reference_hashes (
pdu_id, origin
);
CREATE TABLE IF NOT EXISTS pdu_origin_signatures (
pdu_id TEXT,

44
synapse/storage/signatures.py
View File

@ -21,7 +21,7 @@ from twisted.internet import defer
class SignatureStore(SQLBaseStore):
"""Persistence for PDU signatures and hashes"""
def _get_pdu_hashes_txn(self, txn, pdu_id, origin):
def _get_pdu_content_hashes_txn(self, txn, pdu_id, origin):
"""Get all the hashes for a given PDU.
Args:
txn (cursor):
@ -32,13 +32,14 @@ class SignatureStore(SQLBaseStore):
"""
query = (
"SELECT algorithm, hash"
" FROM pdu_hashes"
" FROM pdu_content_hashes"
" WHERE pdu_id = ? and origin = ?"
)
txn.execute(query, (pdu_id, origin))
return dict(txn.fetchall())
def _store_pdu_hash_txn(self, txn, pdu_id, origin, algorithm, hash_bytes):
def _store_pdu_content_hash_txn(self, txn, pdu_id, origin, algorithm,
hash_bytes):
"""Store a hash for a PDU
Args:
txn (cursor):
@ -47,13 +48,48 @@ class SignatureStore(SQLBaseStore):
algorithm (str): Hashing algorithm.
hash_bytes (bytes): Hash function output bytes.
"""
self._simple_insert_txn(txn, "pdu_hashes", {
self._simple_insert_txn(txn, "pdu_content_hashes", {
"pdu_id": pdu_id,
"origin": origin,
"algorithm": algorithm,
"hash": buffer(hash_bytes),
})
def _get_pdu_reference_hashes_txn(self, txn, pdu_id, origin):
"""Get all the hashes for a given PDU.
Args:
txn (cursor):
pdu_id (str): Id for the PDU.
origin (str): origin of the PDU.
Returns:
A dict of algorithm -> hash.
"""
query = (
"SELECT algorithm, hash"
" FROM pdu_reference_hashes"
" WHERE pdu_id = ? and origin = ?"
)
txn.execute(query, (pdu_id, origin))
return dict(txn.fetchall())
def _store_pdu_reference_hash_txn(self, txn, pdu_id, origin, algorithm,
hash_bytes):
"""Store a hash for a PDU
Args:
txn (cursor):
pdu_id (str): Id for the PDU.
origin (str): origin of the PDU.
algorithm (str): Hashing algorithm.
hash_bytes (bytes): Hash function output bytes.
"""
self._simple_insert_txn(txn, "pdu_reference_hashes", {
"pdu_id": pdu_id,
"origin": origin,
"algorithm": algorithm,
"hash": buffer(hash_bytes),
})
def _get_pdu_origin_signatures_txn(self, txn, pdu_id, origin):
"""Get all the signatures for a given PDU.
Args: