使用Amazon kms一次仅解密一次Blob密码失败

Question

import os, sys
AWS_DIRECTORY = '/home/jenkins/.aws'
certificates_folder = 'my_folder'

SUCCESS = 'success'

class AmazonKMS(object):


def __init__(self):
    # making sure boto3 has the certificates and region files
    result = os.system('mkdir -p ' + AWS_DIRECTORY)
    self._check_os_result(result)
    result = os.system('cp ' + certificates_folder + 'kms_config ' + AWS_DIRECTORY + '/config')
    self._check_os_result(result)
    result = os.system('cp ' + certificates_folder + 'kms_credentials ' + AWS_DIRECTORY + '/credentials')
    self._check_os_result(result)


    # boto3 is the amazon client package
    import boto3
    self.kms_client = boto3.client('kms', region_name='us-east-1')
    self.global_key_alias = 'alias/global'
    self.global_key_id = None

def _check_os_result(self, result):
    if result != 0 and raise_on_copy_error:
        raise FAILED_COPY


def decrypt_text(self, encrypted_text):
    response = self.kms_client.decrypt(
        CiphertextBlob = encrypted_text
    )

    return response['Plaintext']

使用时amazon_kms = AmazonKMS（）amazon_kms.decrypt_text（blob_password）

获取

E   ClientError: An error occurred (AccessDeniedException) when calling the Decrypt operation: The ciphertext refers to a customer master key that does not exist, does not exist in this region, or you are not allowed to access.

stacktrace是

../keys_management/amazon_kms.py:77: in decrypt_text
    CiphertextBlob = encrypted_text
/home/jenkins/.virtualenvs/global_tests/local/lib/python2.7/site-packages/botocore/client.py:253: in _api_call
    return self._make_api_call(operation_name, kwargs)
/home/jenkins/.virtualenvs/global_tests/local/lib/python2.7/site-packages/botocore/client.py:557: in _make_api_call
    raise error_class(parsed_response, operation_name)

这会在每小时运行一次的脚本中发生。

每天仅失败2次-3次。

重试后成功。

已尝试从boto3 1.2.3升级到1.4.4

此行为的可能原因是什么？

Answer 1

我的猜测是，问题不在您在此处描述的任何内容内。最有可能是登录令牌超时或类似的情况。要对此进行进一步调查，可能对这里的登录方式有帮助。此代码如何运行？它是否像在Lambda或EC2上一样在AWS内运行？您是否在自己的服务器上运行它（看起来像在jenkins上运行）？如何建立登录访问权限？这些kms_credentials用于什么用途，它们的外观如何？您是否做了类似承担角色的工作（可能会通过访问令牌起作用，而在一段时间后将不再起作用）？