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Make handling of federation Authorization header (more) compliant with RFC7230 (#12774)
The main differences are: - values with delimiters (such as colons) should be quoted, so always quote the origin, since it could contain a colon followed by a port number - should allow more than one space after "X-Matrix" - quoted values with backslash-escaped characters should be unescaped - names should be case insensitive
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changelog.d/12774.misc
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changelog.d/12774.misc
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Make handling of federation Authorization header (more) compliant with RFC7230.
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@ -169,14 +169,16 @@ def _parse_auth_header(header_bytes: bytes) -> Tuple[str, str, str, Optional[str
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"""
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"""
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try:
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try:
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header_str = header_bytes.decode("utf-8")
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header_str = header_bytes.decode("utf-8")
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params = header_str.split(" ")[1].split(",")
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params = re.split(" +", header_str)[1].split(",")
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param_dict: Dict[str, str] = {
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param_dict: Dict[str, str] = {
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k: v for k, v in [param.split("=", maxsplit=1) for param in params]
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k.lower(): v for k, v in [param.split("=", maxsplit=1) for param in params]
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}
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}
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def strip_quotes(value: str) -> str:
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def strip_quotes(value: str) -> str:
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if value.startswith('"'):
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if value.startswith('"'):
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return value[1:-1]
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return re.sub(
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"\\\\(.)", lambda matchobj: matchobj.group(1), value[1:-1]
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)
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else:
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else:
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return value
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return value
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@ -747,7 +747,7 @@ class MatrixFederationHttpClient:
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for key, sig in request["signatures"][self.server_name].items():
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for key, sig in request["signatures"][self.server_name].items():
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auth_headers.append(
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auth_headers.append(
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(
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(
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'X-Matrix origin=%s,key="%s",sig="%s",destination="%s"'
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'X-Matrix origin="%s",key="%s",sig="%s",destination="%s"'
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% (
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% (
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self.server_name,
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self.server_name,
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key,
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key,
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@ -17,7 +17,7 @@ from typing import Dict, List, Tuple
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from synapse.api.errors import Codes
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from synapse.api.errors import Codes
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from synapse.federation.transport.server import BaseFederationServlet
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from synapse.federation.transport.server import BaseFederationServlet
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from synapse.federation.transport.server._base import Authenticator
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from synapse.federation.transport.server._base import Authenticator, _parse_auth_header
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from synapse.http.server import JsonResource, cancellable
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from synapse.http.server import JsonResource, cancellable
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from synapse.server import HomeServer
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from synapse.server import HomeServer
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from synapse.types import JsonDict
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from synapse.types import JsonDict
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@ -112,3 +112,30 @@ class BaseFederationServletCancellationTests(
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expect_cancellation=False,
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expect_cancellation=False,
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expected_body={"result": True},
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expected_body={"result": True},
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)
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)
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class BaseFederationAuthorizationTests(unittest.TestCase):
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def test_authorization_header(self) -> None:
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"""Tests that the Authorization header is parsed correctly."""
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# test a "normal" Authorization header
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self.assertEqual(
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_parse_auth_header(
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b'X-Matrix origin=foo,key="ed25519:1",sig="sig",destination="bar"'
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),
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("foo", "ed25519:1", "sig", "bar"),
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)
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# test an Authorization with extra spaces, upper-case names, and escaped
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# characters
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self.assertEqual(
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_parse_auth_header(
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b'X-Matrix ORIGIN=foo,KEY="ed25\\519:1",SIG="sig",destination="bar"'
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),
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("foo", "ed25519:1", "sig", "bar"),
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)
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self.assertEqual(
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_parse_auth_header(
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b'X-Matrix origin=foo,key="ed25519:1",sig="sig",destination="bar",extra_field=ignored'
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),
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("foo", "ed25519:1", "sig", "bar"),
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)
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