def _parse_s3_config(config_file_name, config_format='boto', profile=None):
    """
    
    """
    config = configparser.ConfigParser()
    if config.read(config_file_name):  # pragma: no cover
        sections = config.sections()
    else:
        raise AirflowException("Couldn't read {0}".format(config_file_name))
    # Setting option names depending on file format
    if config_format is None:
        config_format = 'boto'
    conf_format = config_format.lower()
    if conf_format == 'boto':  # pragma: no cover
        if profile is not None and 'profile ' + profile in sections:
            cred_section = 'profile ' + profile
        else:
            cred_section = 'Credentials'
    elif conf_format == 'aws' and profile is not None:
        cred_section = profile
    else:
        cred_section = 'default'
    # Option names
    if conf_format in ('boto', 'aws'):  # pragma: no cover
        key_id_option = 'aws_access_key_id'
        secret_key_option = 'aws_secret_access_key'
        # security_token_option = 'aws_security_token'
    else:
        key_id_option = 'access_key'
        secret_key_option = 'secret_key'
    # Actual Parsing
    if cred_section not in sections:
        raise AirflowException("This config file format is not recognized")
    else:
        try:
            access_key = config.get(cred_section, key_id_option)
            secret_key = config.get(cred_section, secret_key_option)
        except Exception:
            logging.warning("Option Error in parsing s3 config file")
            raise
        return access_key, secret_key