AWS Cognito Invalid identity pool configuration

问题:

I am using the AWS Javascript API and trying to get the assigned cognito id:

AWS.config.credentials.get(function(err) {
    if (!err) {
        console.log("Cognito Identity Id: " + AWS.config.credentials.identityId);
    }
});

Why does this result in a 400 error with the message below?

{"__type":"InvalidIdentityPoolConfigurationException","message":"Invalid identity pool configuration. Check assigned IAM roles for this pool."}

I have IAM roles configured for authenticated and non-authenticated users.

{
"Version": "2012-10-17",
"Statement": [{
    "Action": [
        "mobileanalytics:PutEvents",
        "cognito-sync:*"
    ],
    "Effect": "Allow",
    "Resource": [
        "*"
    ]
}]
}

回答1:

The most common reason for this error is your roles aren't set up to trust your identity pool. You should confirm that the identity pool id listed in your trust relationships matches the identity pool you are using.

More info on trust relationships in Amazon Cognito can be found in our developer guide.

回答2:

After some digging I realized that you must add the RoleArn and AccountId to your credentials.

Even though most of the documentation out there mention this as being enough:

AWS.config.credentials = new AWS.CognitoIdentityCredentials({
    IdentityPoolId: 'us-east-1:xxxxx-a87e-46ed-9519-xxxxxxx',
});

This was not enough.

I had to do this:

AWS.config.credentials = new AWS.CognitoIdentityCredentials({
    IdentityPoolId: 'us-east-1:xxxxx-a87e-46ed-9519-xxxxx',
    RoleArn: 'arn:aws:iam::xxxxx:role/Cognito_xxxxUsersUnauth_Role',
    AccountId: 'xxxxxxxxx', // your AWS account ID
});

You must mention the ARN of your Role for your identity pool.

The only doc that mention it right is this one.

The wrong ones:

• http://docs.aws.amazon.com/AWSJavaScriptSDK/guide/browser-configuring.html

• https://mobile.awsblog.com/post/TxBVEDL5Z8JKAC/Use-Amazon-Cognito-in-your-website-for-simple-AWS-authentication

• https://blogs.aws.amazon.com/javascript/post/TxTUNTVES4AL15/Authentication-in-the-Browser-with-Amazon-Cognito-and-Public-Identity-Providers

Maybe I'm missing something but this is certainly confusing.

回答3:

Check the "Trust Relationship" section of the role that is assigned to your Identity Pool, authentication users. Make sure you have policies defining access to your Cognito pool.

The easiest way to get the requirement policy statements is,

1. Edit the pool
2. Create new role for identity pool
3. In IAM edit this role to copy the policy statements
4. Add these Trust Relationships to your required existing role

回答4:

I checked the Trust Relationship of my roles configured for "Authenticated role" and "Unauthenticated role" for my identity pool more than once, but still the error occured. After reviewing my whole identity pool configuration I recognized that in

• Authentication providers
  • Cognito
    • Authenticated role selection

I have chosen "Choose role from token" and my wrong configured role was the one I attached to the cognito group for my users. So updating the Trust Relationship for this role fixed the problem.

Hope this helps someone :)

回答5:

I encountered this error and my problem turned out to be that my user was assuming an unauthenticated role because I was returning AWSTask(result:nil) from the logins() function in my custom CognitoDeveloperIdentityProvider.