AuthorizationException(403, 'Forbidden')

Question

We're currently facing challenges in granting the necessary permissions to your Lambda function to access Amazon OpenSearch Service serverless. Despite our efforts, we're encountering a persistent 403 error when attempting to index documents. Resolving these authorization issues is crucial for the Lambda function to operate as intended.

I can't correctly assign aoss:API AccessAll and aoss:Dashboards AccessAll permissions.

Didier Durand · Answer

Hi,

The key part is the execution role of the Lambda: see https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/quickref-lambda.html for a full CloudFormation template.

The key part for you is the execution role:  replace below the auth for CloudWatch ('logs') with yours for OpenSearch ('aoss')

```
LambdaExecutionRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service:
                - lambda.amazonaws.com
            Action:
              - sts:AssumeRole
      Path: /
      Policies:
        - PolicyName: root
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Effect: Allow
                Action:
                  - logs:*
                Resource: arn:aws:logs:*:*:*
```

This page also will show you how to setup the various required AOSS policies: https://docs.aws.amazon.com/opensearch-service/latest/developerguide/serverless-cfn.html

Best,

Didier

AuthorizationException(403, 'Forbidden')

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