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Appendix G. Examples using session tags for Attribute-based access control in STS

The following list contains examples of the usage of session tags for Attribute-based access control (ABAC) in STS.

Example of session tags that are passed in by Keycloak in the web token

{
    "jti": "947960a3-7e91-4027-99f6-da719b0d4059",
    "exp": 1627438044,
    "nbf": 0,
    "iat": 1627402044,
    "iss": "http://localhost:8080/auth/realms/quickstart",
    "aud": "app-profile-jsp",
    "sub": "test",
    "typ": "ID",
    "azp": "app-profile-jsp",
    "auth_time": 0,
    "session_state": "3a46e3e7-d198-4a64-8b51-69682bcfc670",
    "preferred_username": "test",
    "email_verified": false,
    "acr": "1",
    "https://aws.amazon.com/tags": [
        {
            "principal_tags": {
                "Department": [
                    "Engineering",
                    "Marketing"
                ]
            }
        }
    ],
    "client_id": "app-profile-jsp",
    "username": "test",
    "active": true
}
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Example of aws:RequestTag

{
        "Version":"2012-10-17",
        "Statement":[
        {
            "Effect":"Allow",
            "Action":["sts:AssumeRoleWithWebIdentity","sts:TagSession"],
            "Principal":{"Federated":["arn:aws:iam:::oidc-provider/localhost:8080/auth/realms/quickstart"]},
            "Condition":{"StringEquals":{"aws:RequestTag/Department":"Engineering"}}
        }]
    }
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Example of aws:PrincipalTag

{
        "Version":"2012-10-17",
        "Statement":[
        {
            "Effect":"Allow",
            "Action":["s3:*"],
        "Resource":["arn:aws:s3::t1tenant:my-test-bucket","arn:aws:s3::t1tenant:my-test-bucket/*],"+
            "Condition":{"StringEquals":{"aws:PrincipalTag/Department":"Engineering"}}
        }]
    }
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Example of aws:ResourceTag

{
        "Version":"2012-10-17",
        "Statement":[
        {
            "Effect":"Allow",
            "Action":["sts:AssumeRoleWithWebIdentity","sts:TagSession"],
            "Principal":{"Federated":["arn:aws:iam:::oidc-provider/localhost:8080/auth/realms/quickstart"]},
            "Condition":{"StringEquals":{"iam:ResourceTag/Department":"Engineering"}}
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        }]
    }
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1 1 1
For the above to work, you need to attach the ‘Department=Engineering’ tag to the role.

Example of aws:TagKeys

{
        "Version":"2012-10-17",
        "Statement":[
        {
            "Effect":"Allow",
            "Action":["sts:AssumeRoleWithWebIdentity","sts:TagSession"],
            "Principal":{"Federated":["arn:aws:iam:::oidc-provider/localhost:8080/auth/realms/quickstart"]},
            "Condition":{"ForAllValues:StringEquals":{"aws:TagKeys":["Marketing,Engineering"]}}
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        }]
    }
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ForAllValues:StringEquals tests whether every tag key in the request is a subset of the tag keys in the policy. Therefore, the condition restricts the tag keys passed in the request.

Example of s3:ResourceTag

{
    "Version":"2012-10-17",
    "Statement":[
    {
        "Effect":"Allow",
        "Action":["s3:PutBucketTagging"],
        "Resource":["arn:aws:s3::t1tenant:my-test-bucket\","arn:aws:s3::t1tenant:my-test-bucket/*"]
    },
    {
        "Effect":"Allow",
        "Action":["s3:*"],
        "Resource":["*"],
        "Condition":{"StringEquals":{"s3:ResourceTag/Department":\"Engineering"}}
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    }
}
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For the above to work, you need to attach the ‘Department=Engineering’ tag to the bucket or object on which you want this policy to be applied.

Example of aws:RequestTag with iam:ResourceTag

{
        "Version":"2012-10-17",
        "Statement":[
        {
            "Effect":"Allow",
            "Action":["sts:AssumeRoleWithWebIdentity","sts:TagSession"],
            "Principal":{"Federated":["arn:aws:iam:::oidc-provider/localhost:8080/auth/realms/quickstart"]},
            "Condition":{"StringEquals":{"aws:RequestTag/Department":"${iam:ResourceTag/Department}"}}
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        }]
    }
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This is to assume a role by matching the tags in the incoming request with the tag attached to the role. aws:RequestTag is the incoming tag in the JSON Web Token (JWT) and iam:ResourceTag is the tag attached to the role being assumed.

Example of aws:PrincipalTag with s3:ResourceTag

{
    "Version":"2012-10-17",
    "Statement":[
    {
        "Effect":"Allow",
        "Action":["s3:PutBucketTagging"],
        "Resource":["arn:aws:s3::t1tenant:my-test-bucket\","arn:aws:s3::t1tenant:my-test-bucket/*"]
    },
    {
        "Effect":"Allow",
        "Action":["s3:*"],
        "Resource":["*"],
        "Condition":{"StringEquals":{"s3:ResourceTag/Department":"${aws:PrincipalTag/Department}"}}
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    }
}
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This is to evaluate a role permission policy by matching principal tags with S3 resource tags. aws:PrincipalTag is the tag passed in along with the temporary credentials and s3:ResourceTag is the tag attached to the S3 resource, that is object or bucket.
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