MongooseIM/ejabberd: 使用 scram 的 http 身份验证

Question

我目前正在尝试使用 MongooseIM 并希望将 HTTP 身份验证与 scram 一起使用。我正在使用 python passlib 创建 scram 哈希：

import sys
from passlib.hash import scram


def main():
    hash = scram.encrypt(sys.argv[1], rounds=4096, salt_size=16)
    print hash


if __name__ == "__main__":
    main()

然后我得到这样的结果：

$scram96$BmAsRcgZA4AwRijl3FtLyQ$sha-1=AXh5FzYzEnf6PaVQNR79AZhkwz8,sha-256=YZceXCVhfCBrr8sM9k3eS.5bztHugerGzjO97emvn20,sha-512=2NyVspiE7MP6xBAEycAV5Z/nIbBlki3sHfWvVUPPnEkMt5b4VbZfDZ0s8lvE/ns0scPGWmfKhUobmZbjfFH6RA

很遗憾，MongooseIM 的 HTTP 验证不接受这种格式。我查看了代码并试图找出 scram 哈希密码的序列化形式在此处的样子：https://github.com/esl/MongooseIM/blob/master/apps/ejabberd/src/scram.erl

deserialize(<<?SCRAM_SERIAL_PREFIX, Serialized/binary>>) ->
    case catch binary:split(Serialized, <<",">>, [global]) of
        [StoredKey, ServerKey,Salt,IterationCount] ->
            {ok, #scram{storedkey = StoredKey,
                        serverkey = ServerKey,
                        salt = Salt,
                        iterationcount = binary_to_integer(IterationCount)}};
        _ ->
            ?WARNING_MSG("Incorrect serialized SCRAM: ~p, ~p", [Serialized]),
            {error, incorrect_scram}
    end;

据我所知，从 passlib 中我得到了加盐（散列）密码的加盐、迭代计数和实际摘要（sha-1、sha-256、sha-512），但是 StoredKey 呢和Erlang代码中的ServerKey？ host/get_password 返回的正确的序列化 HTTP 正文会是什么样子？

提前致谢，马格努斯

Answer 1

这是一个很好的问题，实际上让我意识到我们没有记录它。我们会修复它。

目前预期的格式如下所示（您可以使用 MongooseIM 的调试 shell 来生成它）。

scram:serialize(scram:password_to_scram(<<"ala_ma_kota">>, 4096)).
<<"==SCRAM==,xB2++RvZklv0rV5I1iuCpoxLqL0=,sKXBkOFrtyGxKqYo/dlzeKfYszU=,oplvMJ5VDxQ7rJZuIj0ZfA==,4096">>

换句话说，MongooseIM 期望格式为：

==SCRAM==,StoredKey,ServerKey,Salt,IterationCount

==SCRAM==前缀不变，其他部分取决于密码。

希望对您有所帮助。

Answer 2

所以我想通了并写了一个小 python 脚本来生成预期的格式。

import base64
import hashlib
import hmac
import sys
from passlib.hash import scram


# password_to_scram(Password, IterationCount) ->
#     Salt = crypto:rand_bytes(?SALT_LENGTH),
#     SaltedPassword = salted_password(Password, Salt, IterationCount),
#     StoredKey = stored_key(scram:client_key(SaltedPassword)),
#     ServerKey = server_key(SaltedPassword),
#     #scram{storedkey = base64:encode(StoredKey),
#            serverkey = base64:encode(ServerKey),
#            salt = base64:encode(Salt),
#            iterationcount = IterationCount}.
def main():
    rounds = 4096
    hash = scram.encrypt(sys.argv[1], rounds=rounds, salt_size=16)
    hash = scram.encrypt('1234', rounds=rounds, salt='salt')
    salt, iterations, salted_password = scram.extract_digest_info(hash, "sha-1")

    # server_key(SaltedPassword) ->
    # crypto:hmac(sha, SaltedPassword, <<"Server Key">>).
    server_key = hmac.new(key=salted_password, msg='Server Key', digestmod=hashlib.sha1).digest()

    # client_key(SaltedPassword) ->
    # crypto:hmac(sha, SaltedPassword, <<"Client Key">>).
    client_key = hmac.new(key=salted_password, msg='Client Key', digestmod=hashlib.sha1).digest()

    # StoredKey = stored_key(scram:client_key(SaltedPassword)),
    stored_key = hashlib.sha1(client_key).digest()

    result = '==SCRAM==,%s,%s,%s,%d' % \
          (base64.b64encode(stored_key), base64.b64encode(server_key), base64.b64encode(salt), rounds)

    print result

if __name__ == '__main__':
    main()

验证：

(mongooseim@localhost)2> base64:encode(scram:salted_password(<<"1234">>, <<"salt">>, 4096)).    
<<"vbpf4gmRPxs/+ru4TZJO3toJdw0=">>

(mongooseim@localhost)4> base64:encode(scram:stored_key(scram:client_key(scram:salted_password(<<"1234">>, <<"salt">>, 4096)))).
<<"bXKEekOUoWNAx0f21H/fIZ4dj6Y=">>

(mongooseim@localhost)3> base64:encode(scram:server_key(scram:salted_password(<<"1234">>, <<"salt">>, 4096))).
<<"eVwl7wTir232HDy7Tzq3SXZHn+4=">>

==SCRAM==,bXKEekOUoWNAx0f21H/fIZ4dj6Y=,eVwl7wTir232HDy7Tzq3SXZHn+4=,c2FsdA==,4096

MongooseIM/ejabberd: 使用 scram 的 http 身份验证

MongooseIM/ejabberd: http auth using scram

ejabberd

mongoose-im