AWS Integration Guide¶

This guide provides comprehensive information on integrating ZeroTrustKerberosLink with AWS services and infrastructure.

Overview¶

ZeroTrustKerberosLink bridges your enterprise Kerberos authentication with AWS services, allowing users to access AWS resources using their existing Kerberos credentials while maintaining strong security controls.

Prerequisites¶

Before integrating ZeroTrustKerberosLink with AWS, ensure you have:

AWS Account: Active AWS account with administrative access
IAM Permissions: Permissions to create IAM roles and policies
Networking: Network connectivity between ZeroTrustKerberosLink and AWS services
Kerberos Infrastructure: Properly configured Kerberos environment

AWS IAM Configuration¶

Service Role¶

Create an IAM role for ZeroTrustKerberosLink to assume AWS roles on behalf of users:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": "sts:AssumeRole",
      "Resource": "arn:aws:iam::*:role/ZeroTrustKerberos*"
    }
  ]
}

User Roles¶

Create IAM roles that ZeroTrustKerberosLink will map to Kerberos principals:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::123456789012:role/ZeroTrustKerberosLinkServiceRole"
      },
      "Action": "sts:AssumeRole",
      "Condition": {
        "StringEquals": {
          "aws:PrincipalTag/KerberosPrincipal": "${kerberos:principal}"
        }
      }
    }
  ]
}

Role Permissions¶

Configure appropriate permissions for each role based on the principle of least privilege:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "s3:GetObject",
        "s3:ListBucket"
      ],
      "Resource": [
        "arn:aws:s3:::example-bucket",
        "arn:aws:s3:::example-bucket/*"
      ]
    }
  ]
}

AWS STS Configuration¶

Regional Endpoints¶

Configure ZeroTrustKerberosLink to use regional STS endpoints for better performance and availability:

aws:
  sts:
    regional_endpoints: true
    region: "us-west-2"

Cross-Account Access¶

Configure cross-account access to allow users to access resources in multiple AWS accounts:

aws:
  accounts:
    - id: "123456789012"
      name: "Production"
      roles:
        - "arn:aws:iam::123456789012:role/AdminRole"
        - "arn:aws:iam::123456789012:role/DeveloperRole"
    - id: "456789012345"
      name: "Development"
      roles:
        - "arn:aws:iam::456789012345:role/AdminRole"
        - "arn:aws:iam::456789012345:role/DeveloperRole"

AWS Service Integration¶

AWS CloudTrail¶

Enable AWS CloudTrail to audit role assumption activities:

aws:
  cloudtrail:
    enabled: true
    trail_name: "ZeroTrustKerberosLinkTrail"
    s3_bucket: "zerotrustkerberos-logs"
    include_global_service_events: true

AWS CloudWatch¶

Configure CloudWatch for monitoring and alerting:

aws:
  cloudwatch:
    enabled: true
    log_group: "/zerotrustkerberos"
    metrics:
      enabled: true
      namespace: "ZeroTrustKerberosLink"
    alarms:
      enabled: true
      sns_topic: "arn:aws:sns:us-west-2:123456789012:ZeroTrustAlerts"

AWS Secrets Manager¶

Use AWS Secrets Manager to securely store sensitive configuration:

aws:
  secrets_manager:
    enabled: true
    region: "us-west-2"
    secret_id: "zerotrustkerberos/config"

AWS Network Integration¶

VPC Configuration¶

Deploy ZeroTrustKerberosLink in an AWS VPC for secure network integration:

aws:
  vpc:
    id: "vpc-12345678"
    subnets:
      - "subnet-12345678"
      - "subnet-87654321"
    security_groups:
      - "sg-12345678"

AWS PrivateLink¶

Use AWS PrivateLink to securely access AWS services without traversing the public internet:

aws:
  privatelink:
    enabled: true
    services:
      - "com.amazonaws.us-west-2.sts"
      - "com.amazonaws.us-west-2.secretsmanager"

AWS Authentication Flow¶

The authentication flow between ZeroTrustKerberosLink and AWS follows these steps:

User authenticates to ZeroTrustKerberosLink using Kerberos
ZeroTrustKerberosLink validates the Kerberos ticket
ZeroTrustKerberosLink maps the Kerberos principal to an AWS IAM role
ZeroTrustKerberosLink calls AWS STS AssumeRole API
AWS STS returns temporary credentials
ZeroTrustKerberosLink returns the temporary credentials to the user

┌─────────┐          ┌─────────────────┐          ┌─────────┐
│         │          │                 │          │         │
│  User   │          │  ZeroTrust      │          │  AWS    │
│         │          │  KerberosLink   │          │  STS    │
│         │          │                 │          │         │
└────┬────┘          └────────┬────────┘          └────┬────┘
     │                        │                         │
     │ 1. Kerberos Auth       │                         │
     │ ───────────────────►   │                         │
     │                        │                         │
     │                        │ 2. AssumeRole           │
     │                        │ ────────────────────►   │
     │                        │                         │
     │                        │ 3. Temporary Credentials│
     │                        │ ◄────────────────────   │
     │                        │                         │
     │ 4. Temporary Credentials                         │
     │ ◄───────────────────   │                         │
     │                        │                         │

Security Considerations¶

When integrating with AWS, follow these security best practices:

Use IAM Roles

Always use IAM roles with temporary credentials instead of long-term access keys.

Implement Least Privilege

Grant only the permissions necessary for each role.

Enable CloudTrail

Enable AWS CloudTrail to audit all API calls and role assumptions.

Use Conditions in Trust Policies

Implement conditions in role trust policies to restrict when roles can be assumed.

Secure Network Communication

Use VPC endpoints or PrivateLink to securely communicate with AWS services.

Troubleshooting¶

Common AWS integration issues include:

Issue	Possible Causes	Resolution
Role assumption failure	Insufficient permissions, trust policy issues	Check role trust policy, verify permissions
Expired credentials	Credential expiration	Refresh credentials before expiration
Permission denied	Insufficient role permissions, restrictive session policy	Check role permissions, review session policy
Rate limiting	Too many API calls	Implement exponential backoff, reduce request frequency
Network connectivity	VPC configuration, security groups	Check network connectivity, verify security group rules