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