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import argparse
import json
import logging
import sys
import urllib2
import dns.resolver
from signedjson.key import decode_verify_key_bytes, write_signing_keys
from signedjson.sign import verify_signed_json
from unpaddedbase64 import decode_base64
def get_targets(server_name):
if ":" in server_name:
target, port = server_name.split(":")
yield (target, int(port))
return
try:
answers = dns.resolver.query("_matrix._tcp." + server_name, "SRV")
for srv in answers:
yield (srv.target, srv.port)
except dns.resolver.NXDOMAIN:
yield (server_name, 8448)
def get_server_keys(server_name, target, port):
url = "https://%s:%i/_matrix/key/v1" % (target, port)
keys = json.load(urllib2.urlopen(url))
verify_keys = {}
for key_id, key_base64 in keys["verify_keys"].items():
verify_key = decode_verify_key_bytes(key_id, decode_base64(key_base64))
verify_signed_json(keys, server_name, verify_key)
verify_keys[key_id] = verify_key
return verify_keys
def main():
parser = argparse.ArgumentParser()
parser.add_argument("signature_name")
parser.add_argument(
"input_json", nargs="?", type=argparse.FileType('r'), default=sys.stdin
)
args = parser.parse_args()
logging.basicConfig()
server_name = args.signature_name
keys = {}
for target, port in get_targets(server_name):
try:
keys = get_server_keys(server_name, target, port)
print("Using keys from https://%s:%s/_matrix/key/v1" % (target, port))
write_signing_keys(sys.stdout, keys.values())
break
except Exception:
logging.exception("Error talking to %s:%s", target, port)
json_to_check = json.load(args.input_json)
print("Checking JSON:")
for key_id in json_to_check["signatures"][args.signature_name]:
try:
key = keys[key_id]
verify_signed_json(json_to_check, args.signature_name, key)
print("PASS %s" % (key_id,))
except Exception:
logging.exception("Check for key %s failed" % (key_id,))
print("FAIL %s" % (key_id,))
if __name__ == '__main__':
main()
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