329 lines
9.5 KiB
Python
Executable File
329 lines
9.5 KiB
Python
Executable File
#!/usr/bin/env python
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#
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# Copyright 2015, 2016 OpenMarket Ltd
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# Copyright 2017 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import argparse
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import base64
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import json
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import sys
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from typing import Any, Optional
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from urllib import parse as urlparse
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import nacl.signing
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import requests
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import signedjson.types
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import srvlookup
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import yaml
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from requests.adapters import HTTPAdapter
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# uncomment the following to enable debug logging of http requests
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# from httplib import HTTPConnection
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# HTTPConnection.debuglevel = 1
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def encode_base64(input_bytes):
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"""Encode bytes as a base64 string without any padding."""
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input_len = len(input_bytes)
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output_len = 4 * ((input_len + 2) // 3) + (input_len + 2) % 3 - 2
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output_bytes = base64.b64encode(input_bytes)
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output_string = output_bytes[:output_len].decode("ascii")
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return output_string
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def decode_base64(input_string):
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"""Decode a base64 string to bytes inferring padding from the length of the
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string."""
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input_bytes = input_string.encode("ascii")
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input_len = len(input_bytes)
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padding = b"=" * (3 - ((input_len + 3) % 4))
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output_len = 3 * ((input_len + 2) // 4) + (input_len + 2) % 4 - 2
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output_bytes = base64.b64decode(input_bytes + padding)
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return output_bytes[:output_len]
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def encode_canonical_json(value):
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return json.dumps(
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value,
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# Encode code-points outside of ASCII as UTF-8 rather than \u escapes
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ensure_ascii=False,
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# Remove unecessary white space.
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separators=(",", ":"),
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# Sort the keys of dictionaries.
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sort_keys=True,
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# Encode the resulting unicode as UTF-8 bytes.
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).encode("UTF-8")
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def sign_json(
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json_object: Any, signing_key: signedjson.types.SigningKey, signing_name: str
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) -> Any:
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signatures = json_object.pop("signatures", {})
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unsigned = json_object.pop("unsigned", None)
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signed = signing_key.sign(encode_canonical_json(json_object))
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signature_base64 = encode_base64(signed.signature)
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key_id = "%s:%s" % (signing_key.alg, signing_key.version)
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signatures.setdefault(signing_name, {})[key_id] = signature_base64
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json_object["signatures"] = signatures
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if unsigned is not None:
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json_object["unsigned"] = unsigned
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return json_object
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NACL_ED25519 = "ed25519"
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def decode_signing_key_base64(algorithm, version, key_base64):
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"""Decode a base64 encoded signing key
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Args:
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algorithm (str): The algorithm the key is for (currently "ed25519").
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version (str): Identifies this key out of the keys for this entity.
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key_base64 (str): Base64 encoded bytes of the key.
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Returns:
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A SigningKey object.
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"""
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if algorithm == NACL_ED25519:
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key_bytes = decode_base64(key_base64)
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key = nacl.signing.SigningKey(key_bytes)
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key.version = version
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key.alg = NACL_ED25519
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return key
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else:
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raise ValueError("Unsupported algorithm %s" % (algorithm,))
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def read_signing_keys(stream):
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"""Reads a list of keys from a stream
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Args:
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stream : A stream to iterate for keys.
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Returns:
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list of SigningKey objects.
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"""
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keys = []
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for line in stream:
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algorithm, version, key_base64 = line.split()
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keys.append(decode_signing_key_base64(algorithm, version, key_base64))
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return keys
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def request(
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method: Optional[str],
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origin_name: str,
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origin_key: signedjson.types.SigningKey,
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destination: str,
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path: str,
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content: Optional[str],
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) -> requests.Response:
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if method is None:
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if content is None:
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method = "GET"
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else:
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method = "POST"
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json_to_sign = {
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"method": method,
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"uri": path,
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"origin": origin_name,
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"destination": destination,
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}
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if content is not None:
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json_to_sign["content"] = json.loads(content)
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signed_json = sign_json(json_to_sign, origin_key, origin_name)
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authorization_headers = []
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for key, sig in signed_json["signatures"][origin_name].items():
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header = 'X-Matrix origin=%s,key="%s",sig="%s"' % (origin_name, key, sig)
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authorization_headers.append(header.encode("ascii"))
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print("Authorization: %s" % header, file=sys.stderr)
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dest = "matrix://%s%s" % (destination, path)
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print("Requesting %s" % dest, file=sys.stderr)
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s = requests.Session()
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s.mount("matrix://", MatrixConnectionAdapter())
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headers = {"Host": destination, "Authorization": authorization_headers[0]}
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if method == "POST":
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headers["Content-Type"] = "application/json"
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return s.request(
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method=method,
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url=dest,
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headers=headers,
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verify=False,
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data=content,
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stream=True,
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)
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def main():
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parser = argparse.ArgumentParser(
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description="Signs and sends a federation request to a matrix homeserver"
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)
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parser.add_argument(
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"-N",
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"--server-name",
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help="Name to give as the local homeserver. If unspecified, will be "
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"read from the config file.",
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)
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parser.add_argument(
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"-k",
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"--signing-key-path",
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help="Path to the file containing the private ed25519 key to sign the "
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"request with.",
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)
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parser.add_argument(
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"-c",
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"--config",
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default="homeserver.yaml",
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help="Path to server config file. Ignored if --server-name and "
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"--signing-key-path are both given.",
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)
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parser.add_argument(
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"-d",
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"--destination",
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default="matrix.org",
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help="name of the remote homeserver. We will do SRV lookups and "
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"connect appropriately.",
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)
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parser.add_argument(
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"-X",
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"--method",
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help="HTTP method to use for the request. Defaults to GET if --body is"
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"unspecified, POST if it is.",
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)
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parser.add_argument("--body", help="Data to send as the body of the HTTP request")
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parser.add_argument(
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"path", help="request path. We will add '/_matrix/federation/v1/' to this."
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)
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args = parser.parse_args()
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if not args.server_name or not args.signing_key_path:
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read_args_from_config(args)
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with open(args.signing_key_path) as f:
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key = read_signing_keys(f)[0]
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result = request(
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args.method,
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args.server_name,
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key,
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args.destination,
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"/_matrix/federation/v1/" + args.path,
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content=args.body,
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)
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sys.stderr.write("Status Code: %d\n" % (result.status_code,))
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for chunk in result.iter_content():
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# we write raw utf8 to stdout.
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sys.stdout.buffer.write(chunk)
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print("")
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def read_args_from_config(args):
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with open(args.config, "r") as fh:
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config = yaml.safe_load(fh)
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if not args.server_name:
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args.server_name = config["server_name"]
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if not args.signing_key_path:
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args.signing_key_path = config["signing_key_path"]
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class MatrixConnectionAdapter(HTTPAdapter):
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@staticmethod
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def lookup(s, skip_well_known=False):
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if s[-1] == "]":
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# ipv6 literal (with no port)
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return s, 8448
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if ":" in s:
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out = s.rsplit(":", 1)
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try:
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port = int(out[1])
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except ValueError:
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raise ValueError("Invalid host:port '%s'" % s)
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return out[0], port
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# try a .well-known lookup
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if not skip_well_known:
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well_known = MatrixConnectionAdapter.get_well_known(s)
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if well_known:
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return MatrixConnectionAdapter.lookup(well_known, skip_well_known=True)
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try:
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srv = srvlookup.lookup("matrix", "tcp", s)[0]
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return srv.host, srv.port
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except Exception:
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return s, 8448
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@staticmethod
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def get_well_known(server_name):
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uri = "https://%s/.well-known/matrix/server" % (server_name,)
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print("fetching %s" % (uri,), file=sys.stderr)
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try:
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resp = requests.get(uri)
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if resp.status_code != 200:
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print("%s gave %i" % (uri, resp.status_code), file=sys.stderr)
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return None
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parsed_well_known = resp.json()
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if not isinstance(parsed_well_known, dict):
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raise Exception("not a dict")
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if "m.server" not in parsed_well_known:
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raise Exception("Missing key 'm.server'")
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new_name = parsed_well_known["m.server"]
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print("well-known lookup gave %s" % (new_name,), file=sys.stderr)
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return new_name
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except Exception as e:
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print("Invalid response from %s: %s" % (uri, e), file=sys.stderr)
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return None
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def get_connection(self, url, proxies=None):
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parsed = urlparse.urlparse(url)
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(host, port) = self.lookup(parsed.netloc)
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netloc = "%s:%d" % (host, port)
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print("Connecting to %s" % (netloc,), file=sys.stderr)
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url = urlparse.urlunparse(
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("https", netloc, parsed.path, parsed.params, parsed.query, parsed.fragment)
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)
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return super().get_connection(url, proxies)
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if __name__ == "__main__":
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main()
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