# Use an IAM Role

### Setting up an IAM Role

If using an IAM role to provide access

1\) **Create a policy that allows access to the bucket:** 

* Go to the AWS IAM Console → Policies → Create Policy
* Go to the JSON tab
* Copy the following policy and paste it into the visual editor. Replace `{your-bucket-name}` with the name of your S3 bucket.

#### For Imports:

```json
{
    "Version": "2012-10-17",
    "Statement": [
        {
        "Effect": "Allow",
        "Action": [
                "s3:GetBucketLocation",
                "s3:GetObject",
                "s3:ListBucket"

        ],
        "Resource": [
                "arn:aws:s3:::{your-bucket-name}/*",
                "arn:aws:s3:::{your-bucket-name}"
        ]
        }
    ]
}
```

#### For Exports: 

```json
{
    "Version": "2012-10-17",
    "Statement": [
        {
        "Effect": "Allow",
        "Action": [
                "s3:GetBucketLocation",
                "s3:PutObject",
                "s3:ListBucket"

        ],
        "Resource": [
                "arn:aws:s3:::{your-bucket-name}/*",
                "arn:aws:s3:::{your-bucket-name}"
        ]
        }
    ]
}
```

* You can save the policy as `HockeyStack-DataSyncs-S3Access`  

\
2\) **Create an IAM role for our user that can properly access your bucket:** 

* Go to the AWS IAM Console → Roles → Create Role
* Select "Another AWS Account"
  * Enter **422597910032** (HockeyStack-DataSyncs AWS Account ID).
* Check "Require external ID" (Recommended for security)
  * Set an External ID (a unique string you choose, that will be used to configure the DataSync)
* In the Add permissions step, select the `HockeyStack-DataSyncs-S3Access` policy you created, then finish creating the policy. 
* When naming the role, please use the prefix `HockeyStack-DataSyncs*`, as this is required for HockeyStack’s AssumeRole wildcard policy to match. 

{% hint style="warning" %}
If the role you want HockeyStack to assume does not match the wildcard, the Data Sync will **fail with an error** when attempting to assume the role.
{% endhint %}

3\) (**Optional) Giving access specifically to HockeyStack-DataSyncs user:** 

* Edit the custom trust policy of the role, to further specify that only our HockeyStack-DataSyncs user can assume the role: 

```
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn:aws:iam::422597910032:user/HockeyStack-DataSyncs"
            },
            "Action": "sts:AssumeRole",
            "Condition": {
                "StringEquals": {
                    "sts:ExternalId": "YOUR_EXTERNAL_ID"
                }
            }
        }
    ]
}
```


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