auth.py 文件源码

def _authenticate_cram_md5(credentials, sock_info, cmd_func):
    """Authenticate using CRAM-MD5 (RFC 2195)
    """
    source, username, password = credentials
    # The password used as the mac key is the
    # same as what we use for MONGODB-CR
    passwd = _password_digest(username, password)
    cmd = SON([('saslStart', 1),
               ('mechanism', 'CRAM-MD5'),
               ('payload', Binary(b(''))),
               ('autoAuthorize', 1)])
    response, _ = cmd_func(sock_info, source, cmd)
    # MD5 as implicit default digest for digestmod is deprecated
    # in python 3.4
    mac = hmac.HMAC(key=passwd.encode('utf-8'), digestmod=_DMOD)
    mac.update(response['payload'])
    challenge = username.encode('utf-8') + b(' ') + b(mac.hexdigest())
    cmd = SON([('saslContinue', 1),
               ('conversationId', response['conversationId']),
               ('payload', Binary(challenge))])
    cmd_func(sock_info, source, cmd)