来自 Lambda 的 AWS Secrets Manager 调用返回 null/none

Question

我正在使用 AWS Lambda 函数调用 AWS Secrets Manager 来检索秘密值，但它只是 return 值 None/Null。

这是我的代码：

# Secrets Manager
import boto3
import base64
from botocore.exceptions import ClientError


def lambda_handler(event, context):
    # Secrets Manager
    def get_secret():

        secret_name = "arn:aws:secretsmanager:region:accountid:secret:full-secret-name"
        region_name = "region"

        # Create a Secrets Manager client
        session = boto3.session.Session()
        client = session.client(
            service_name='secretsmanager',
            region_name=region_name
        )

        # Only handle the specific exceptions for the 'GetSecretValue' API.
        # See https://docs.aws.amazon.com/secretsmanager/latest/apireference/API_GetSecretValue.html
        # We rethrow the exception by default.

        try:
            get_secret_value_response = client.get_secret_value(
                SecretId=secret_name
            )
        except ClientError as e:
            if e.response['Error']['Code'] == 'DecryptionFailureException':
                # Secrets Manager can't decrypt the protected secret text using the provided KMS key.
                # Deal with the exception here, and/or rethrow at your discretion.
                raise e
            elif e.response['Error']['Code'] == 'InternalServiceErrorException':
                # An error occurred on the server side.
                # Deal with the exception here, and/or rethrow at your discretion.
                raise e
            elif e.response['Error']['Code'] == 'InvalidParameterException':
                # You provided an invalid value for a parameter.
                # Deal with the exception here, and/or rethrow at your discretion.
                raise e
            elif e.response['Error']['Code'] == 'InvalidRequestException':
                # You provided a parameter value that is not valid for the current state of the resource.
                # Deal with the exception here, and/or rethrow at your discretion.
                raise e
            elif e.response['Error']['Code'] == 'ResourceNotFoundException':
                # We can't find the resource that you asked for.
                # Deal with the exception here, and/or rethrow at your discretion.
                raise e
        else:
            # Decrypts secret using the associated KMS CMK.
            # Depending on whether the secret is a string or binary, one of these fields will be populated.
            if 'SecretString' in get_secret_value_response:
                secret = get_secret_value_response['SecretString']
            else:
                decoded_binary_secret = base64.b64decode(get_secret_value_response['SecretBinary'])

    secretValue = get_secret()
    print(secretValue)
    return secretValue

在 return 中，我得到 null，在打印中我得到 None。不太确定我在这里做错了什么，但它不会出错也不会得到我的价值。

Secret 已加密，但 Lambda IAM 角色具有 KMS 密钥的使用权限，并且 KMS 密钥也已授予 IAM 角色使用权。

我也试过将 secret_name 设置为像这样的秘密名称：

secret_name = "full-secret-name-no-arn"

此致

Answer 1

分辨率：

# Secrets Manager
import json
import boto3
import base64
import logging
from botocore.exceptions import ClientError

logger = logging.getLogger()
logger.setLevel(logging.INFO)

def lambda_handler(event, context):
    logger.info("Inside lambda_handler...")

    # SecretsManager
    secretValues = json.loads(get_secret())

def get_secret():
    logger.info("Inside get_secret...")
    secret_name = "full-arn-goes-here"
    region_name = "region-goes-here"

    # Create a Secrets Manager client
    session = boto3.session.Session()
    client = session.client(
        service_name='secretsmanager',
        region_name=region_name

    )

    try:
        get_secret_value_response = client.get_secret_value(SecretId=secret_name)
        logger.info("Received Response")
    except ClientError as e:
        if e.response['Error']['Code'] == 'DecryptionFailureException':
            # Secrets Manager can't decrypt the protected secret text using the provided KMS key.
            # Deal with the exception here, and/or rethrow at your discretion.
            raise e
        elif e.response['Error']['Code'] == 'InternalServiceErrorException':
            # An error occurred on the server side.
            # Deal with the exception here, and/or rethrow at your discretion.
            raise e
        elif e.response['Error']['Code'] == 'InvalidParameterException':
            # You provided an invalid value for a parameter.
            # Deal with the exception here, and/or rethrow at your discretion.
            raise e
        elif e.response['Error']['Code'] == 'InvalidRequestException':
            # You provided a parameter value that is not valid for the current state of the resource.
            # Deal with the exception here, and/or rethrow at your discretion.
            raise e
        elif e.response['Error']['Code'] == 'ResourceNotFoundException':
            # We can't find the resource that you asked for.
            # Deal with the exception here, and/or rethrow at your discretion.
            raise e
        else:
            # Please see https://docs.aws.amazon.com/secretsmanager/latest/apireference/CommonErrors.html for all the other types of errors not handled above
            raise e
    else:
        # Decrypts secret using the associated KMS CMK.
        # Depending on whether the secret is a string or binary, one of these fields will be populated.
        if 'SecretString' in get_secret_value_response:
            logger.info("Inside string response...")
            return get_secret_value_response['SecretString']
        else:
            logger.info("Inside binary response...")
            return base64.b64decode(get_secret_value_response['SecretBinary'])

只需将 secretValues = json.loads(get_secret()) 放入您的处理程序中即可。

Answer 2

您的 get_secret() 没有 return 语句

Answer 3

除了上述更改外，请确保您的 Lambda 执行角色具有访问秘密管理器和 KMS 服务的适当权限。以下是要附加到执行角色的示例 IAM 策略。应用后，以下策略将允许 Lambda 检索密钥而不返回 'None.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": "logs:CreateLogGroup",
            "Resource": "arn:aws:logs:us-west-2:<ACCOUNT_ID>:*"
        },
        {
            "Effect": "Allow",
            "Action": [
                "logs:CreateLogStream",
                "logs:PutLogEvents"
            ],
            "Resource": [
                "arn:aws:logs:us-west-2:<ACCOUNT_ID>:log-group:/aws/lambda/sampletest*:*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "secretsmanager:GetSecretValue",
                "secretsmanager:DescribeSecret",
                "secretsmanager:ListSecretVersionIds",
                "secretsmanager:PutSecretValue",
                "secretsmanager:UpdateSecret",
                "secretsmanager:TagResource",
                "secretsmanager:UntagResource"
            ],
            "Resource": [
                "arn:aws:secretsmanager:us-west-2:<ACCOUNT_ID>:secret:<SECRET_NAME>"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "kms:Decrypt"
            ],
            "Resource": "arn:aws:kms:us-west-2:<ACCOUNT_ID>:key/<KMS_ID>"
        }
    ]
}

Answer 4

这个问题很棘手...因为 AWS 不会为您提供任何有关缺少访问机密管理器服务的权限的有价值的日志信息。您需要处理您所在进程的 IAM 角色运行并为 Secrets Manager 访问添加适当的权限，它不会有任何问题！！！

AWS 只是 returns 'None' 没有给你任何错误信息，真是令人沮丧:(

来自 Lambda 的 AWS Secrets Manager 调用返回 null/none

AWS Secrets Manager call from Lambda returning null/none

amazon-web-services

aws-lambda

aws-kms

aws-secrets-manager