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synapse/scripts-dev/federation_client.py
2019-06-20 19:32:02 +10:00

312 lines
9.3 KiB
Python
Executable file

#!/usr/bin/env python
#
# Copyright 2015, 2016 OpenMarket Ltd
# Copyright 2017 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import print_function
import argparse
import base64
import json
import sys
from six.moves.urllib import parse as urlparse
import nacl.signing
import requests
import srvlookup
import yaml
from requests.adapters import HTTPAdapter
# uncomment the following to enable debug logging of http requests
# from httplib import HTTPConnection
# HTTPConnection.debuglevel = 1
def encode_base64(input_bytes):
"""Encode bytes as a base64 string without any padding."""
input_len = len(input_bytes)
output_len = 4 * ((input_len + 2) // 3) + (input_len + 2) % 3 - 2
output_bytes = base64.b64encode(input_bytes)
output_string = output_bytes[:output_len].decode("ascii")
return output_string
def decode_base64(input_string):
"""Decode a base64 string to bytes inferring padding from the length of the
string."""
input_bytes = input_string.encode("ascii")
input_len = len(input_bytes)
padding = b"=" * (3 - ((input_len + 3) % 4))
output_len = 3 * ((input_len + 2) // 4) + (input_len + 2) % 4 - 2
output_bytes = base64.b64decode(input_bytes + padding)
return output_bytes[:output_len]
def encode_canonical_json(value):
return json.dumps(
value,
# Encode code-points outside of ASCII as UTF-8 rather than \u escapes
ensure_ascii=False,
# Remove unecessary white space.
separators=(",", ":"),
# Sort the keys of dictionaries.
sort_keys=True,
# Encode the resulting unicode as UTF-8 bytes.
).encode("UTF-8")
def sign_json(json_object, signing_key, signing_name):
signatures = json_object.pop("signatures", {})
unsigned = json_object.pop("unsigned", None)
signed = signing_key.sign(encode_canonical_json(json_object))
signature_base64 = encode_base64(signed.signature)
key_id = "%s:%s" % (signing_key.alg, signing_key.version)
signatures.setdefault(signing_name, {})[key_id] = signature_base64
json_object["signatures"] = signatures
if unsigned is not None:
json_object["unsigned"] = unsigned
return json_object
NACL_ED25519 = "ed25519"
def decode_signing_key_base64(algorithm, version, key_base64):
"""Decode a base64 encoded signing key
Args:
algorithm (str): The algorithm the key is for (currently "ed25519").
version (str): Identifies this key out of the keys for this entity.
key_base64 (str): Base64 encoded bytes of the key.
Returns:
A SigningKey object.
"""
if algorithm == NACL_ED25519:
key_bytes = decode_base64(key_base64)
key = nacl.signing.SigningKey(key_bytes)
key.version = version
key.alg = NACL_ED25519
return key
else:
raise ValueError("Unsupported algorithm %s" % (algorithm,))
def read_signing_keys(stream):
"""Reads a list of keys from a stream
Args:
stream : A stream to iterate for keys.
Returns:
list of SigningKey objects.
"""
keys = []
for line in stream:
algorithm, version, key_base64 = line.split()
keys.append(decode_signing_key_base64(algorithm, version, key_base64))
return keys
def request_json(method, origin_name, origin_key, destination, path, content):
if method is None:
if content is None:
method = "GET"
else:
method = "POST"
json_to_sign = {
"method": method,
"uri": path,
"origin": origin_name,
"destination": destination,
}
if content is not None:
json_to_sign["content"] = json.loads(content)
signed_json = sign_json(json_to_sign, origin_key, origin_name)
authorization_headers = []
for key, sig in signed_json["signatures"][origin_name].items():
header = 'X-Matrix origin=%s,key="%s",sig="%s"' % (origin_name, key, sig)
authorization_headers.append(header.encode("ascii"))
print("Authorization: %s" % header, file=sys.stderr)
dest = "matrix://%s%s" % (destination, path)
print("Requesting %s" % dest, file=sys.stderr)
s = requests.Session()
s.mount("matrix://", MatrixConnectionAdapter())
headers = {"Host": destination, "Authorization": authorization_headers[0]}
if method == "POST":
headers["Content-Type"] = "application/json"
result = s.request(
method=method, url=dest, headers=headers, verify=False, data=content
)
sys.stderr.write("Status Code: %d\n" % (result.status_code,))
return result.json()
def main():
parser = argparse.ArgumentParser(
description="Signs and sends a federation request to a matrix homeserver"
)
parser.add_argument(
"-N",
"--server-name",
help="Name to give as the local homeserver. If unspecified, will be "
"read from the config file.",
)
parser.add_argument(
"-k",
"--signing-key-path",
help="Path to the file containing the private ed25519 key to sign the "
"request with.",
)
parser.add_argument(
"-c",
"--config",
default="homeserver.yaml",
help="Path to server config file. Ignored if --server-name and "
"--signing-key-path are both given.",
)
parser.add_argument(
"-d",
"--destination",
default="matrix.org",
help="name of the remote homeserver. We will do SRV lookups and "
"connect appropriately.",
)
parser.add_argument(
"-X",
"--method",
help="HTTP method to use for the request. Defaults to GET if --body is"
"unspecified, POST if it is.",
)
parser.add_argument("--body", help="Data to send as the body of the HTTP request")
parser.add_argument(
"path", help="request path. We will add '/_matrix/federation/v1/' to this."
)
args = parser.parse_args()
if not args.server_name or not args.signing_key_path:
read_args_from_config(args)
with open(args.signing_key_path) as f:
key = read_signing_keys(f)[0]
result = request_json(
args.method,
args.server_name,
key,
args.destination,
"/_matrix/federation/v1/" + args.path,
content=args.body,
)
json.dump(result, sys.stdout)
print("")
def read_args_from_config(args):
with open(args.config, "r") as fh:
config = yaml.safe_load(fh)
if not args.server_name:
args.server_name = config["server_name"]
if not args.signing_key_path:
args.signing_key_path = config["signing_key_path"]
class MatrixConnectionAdapter(HTTPAdapter):
@staticmethod
def lookup(s, skip_well_known=False):
if s[-1] == "]":
# ipv6 literal (with no port)
return s, 8448
if ":" in s:
out = s.rsplit(":", 1)
try:
port = int(out[1])
except ValueError:
raise ValueError("Invalid host:port '%s'" % s)
return out[0], port
# try a .well-known lookup
if not skip_well_known:
well_known = MatrixConnectionAdapter.get_well_known(s)
if well_known:
return MatrixConnectionAdapter.lookup(well_known, skip_well_known=True)
try:
srv = srvlookup.lookup("matrix", "tcp", s)[0]
return srv.host, srv.port
except Exception:
return s, 8448
@staticmethod
def get_well_known(server_name):
uri = "https://%s/.well-known/matrix/server" % (server_name,)
print("fetching %s" % (uri,), file=sys.stderr)
try:
resp = requests.get(uri)
if resp.status_code != 200:
print("%s gave %i" % (uri, resp.status_code), file=sys.stderr)
return None
parsed_well_known = resp.json()
if not isinstance(parsed_well_known, dict):
raise Exception("not a dict")
if "m.server" not in parsed_well_known:
raise Exception("Missing key 'm.server'")
new_name = parsed_well_known["m.server"]
print("well-known lookup gave %s" % (new_name,), file=sys.stderr)
return new_name
except Exception as e:
print("Invalid response from %s: %s" % (uri, e), file=sys.stderr)
return None
def get_connection(self, url, proxies=None):
parsed = urlparse.urlparse(url)
(host, port) = self.lookup(parsed.netloc)
netloc = "%s:%d" % (host, port)
print("Connecting to %s" % (netloc,), file=sys.stderr)
url = urlparse.urlunparse(
("https", netloc, parsed.path, parsed.params, parsed.query, parsed.fragment)
)
return super(MatrixConnectionAdapter, self).get_connection(url, proxies)
if __name__ == "__main__":
main()