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#!/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 nacl.signing
import json
import base64
import requests
import sys
import srvlookup
import yaml
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 lookup(destination, path):
if ":" in destination:
return "https://%s%s" % (destination, path)
else:
try:
srv = srvlookup.lookup("matrix", "tcp", destination)[0]
return "https://%s:%d%s" % (srv.host, srv.port, path)
except:
return "https://%s:%d%s" % (destination, 8448, path)
def get_json(origin_name, origin_key, destination, path):
request_json = {
"method": "GET",
"uri": path,
"origin": origin_name,
"destination": destination,
}
signed_json = sign_json(request_json, 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(bytes(header))
print ("Authorization: %s" % header, file=sys.stderr)
dest = lookup(destination, path)
print ("Requesting %s" % dest, file=sys.stderr)
result = requests.get(
dest,
headers={"Authorization": authorization_headers[0]},
verify=False,
)
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(
"-c", "--config",
type=argparse.FileType('r'),
default="homeserver.yaml",
help="Path to server config file. Used to read in server name and key "
"file",
)
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(
"path",
help="request path. We will add '/_matrix/federation/v1/' to this."
)
args = parser.parse_args()
config = yaml.safe_load(args.config)
origin_name = config['server_name']
keyfile = config['signing_key_path']
with open(keyfile) as f:
key = read_signing_keys(f)[0]
result = get_json(
origin_name, key, args.destination, "/_matrix/federation/v1/" + args.path
)
json.dump(result, sys.stdout)
print ("")
if __name__ == "__main__":
main()
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