Streamlining Large Language Model Access with SAML Integration

Question

Pulumi · Accepted Answer

To streamline access to a Large Language Model with SAML (Security Assertion Markup Language) Integration, we typically set up a SAML Identity Provider (IdP) that authenticates users and grants them access to the Large Language Model service. The service consuming the Large Language Model would then be configured as a SAML Service Provider (SP). When a user tries to access the service, a SAML authentication process is initiated, resulting in the user being authenticated by the IdP and then authorized to access the Large Language Model service.

In this explanation, I'll walk you through setting up a SAML Identity Provider (IdP) on AWS using Pulumi, an Infrastructure as Code tool that allows you to define and deploy infrastructure using general programming language constructs. The AWS component involved in this is called AWS IAM Identity Provider, which you can integrate into your application supporting SAML authentication.

Let’s go through the process with Pulumi in Python:

IAM SAML Identity Provider: This AWS resource is used to create a SAML IdP. It requires a name and a SAML metadata document, which you obtain from your SAML IdP (like Okta, Auth0, or an on-premises IdP).
IAM Role for SAML: After creating your SAML IdP, you'll need IAM roles that establish a trust relationship between your AWS account and the SAML IdP. In the role's trust policy, you specify the SAML provider and conditions for access.
Attach Policies to the Role: Depending on the permissions required by the Large Language Model service, you may need to attach specific policies to the role that grants users the necessary permissions when they are authenticated via SAML.
Configure the Service Provider: On the Large Language Model service side, you would configure SAML settings to be connected to your newly created AWS IAM SAML provider.

In the below program, I will define the necessary resources using Pulumi’s AWS provider (pulumi_aws):

import pulumi
import pulumi_aws as aws

# Define the SAML provider resource.
# The metadata document should be provided by your SAML IdP.
saml_provider = aws.iam.SamlProvider("example-saml-provider",
                                     saml_metadata_document="<SAML_METADATA_DOCUMENT>")

# Create a new IAM role for the SAML provider.
iam_role = aws.iam.Role("saml-iam-role",
                        assume_role_policy=pulumi.Output.all(saml_provider.arn).apply(lambda arn: f"""
{{
  "Version": "2012-10-17",
  "Statement": [
    {{
      "Effect": "Allow",
      "Principal": {{
        "Federated": "{arn}"
      }},
      "Action": "sts:AssumeRoleWithSAML",
      "Condition": {{
        "StringEquals": {{
          "SAML:aud": "https://signin.aws.amazon.com/saml"
        }}
      }}
    }}
  ]
}}
"""))

# Assume you need to provide access to Amazon S3 for the Large Language Model service.
s3_policy = aws.iam.Policy("s3-access-policy",
                            policy="""{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "s3:GetObject",
                "s3:ListBucket"
            ],
            "Resource": "*"
        }
    ]
}
""")

# Attach the policy to the IAM role.
iam_policy_attachment = aws.iam.RolePolicyAttachment("saml-iam-role-attachment",
                                                     role=iam_role.name,
                                                     policy_arn=s3_policy.arn)

# Output the role ARN to be configured on the service provider side.
pulumi.export("saml_iam_role_arn", iam_role.arn)

Here is a breakdown of what the above Pulumi program does:

We begin by creating a SAML Provider, specifying the metadata document which is provided by your SAML Identity Provider setup (Okta, Duo, etc.). This metadata document usually contains information necessary to establish trust between your AWS environment and the SAML IdP.
Next, we create an IAM Role and specify its trust relationship policy document with the "sts:AssumeRoleWithSAML" action. We grant access to the "Principal" with a federated ARN linked to our SAML provider. This means that users authenticated by the SAML provider can assume this role.
We define a custom IAM Policy that grants access to S3 services. This is just an example policy, in a real-world scenario, you would modify the permissions to suit the access requirements of the Large Language Model service.
We then attach the custom policy to the IAM Role. This step connects the policy permissions with the role that authenticated users will assume.
Lastly, we export the ARN of our IAM Role so it can be used by the service provider to establish trust and verify permissions.

Please replace the placeholder <SAML_METADATA_DOCUMENT> with the actual SAML metadata you get from your SAML Identity Provider.

Keep in mind that Large Language Model service integration specificities and SAML configurations can vary, and the above code can be adjusted as per those requirements. Also, you need to configure the service provider’s side (i.e., the Large Language Model service) to use the created IAM SAML provider and role, outside of the scope of this Pulumi program.