Introduction

Cloud IAM Deep Dive

Cloud Identity and Access Management (IAM) is the foundation of cloud security. Misconfigured IAM policies remain the leading cause of cloud data breaches. Understanding how to properly scope permissions across AWS, GCP, and Azure is essential for any cloud security practitioner.

AWS IAM Policies

AWS IAM uses JSON policy documents to define permissions. Policies can be attached to users, groups, or roles. AWS evaluates all policies attached to a principal, combining them with resource-based policies, and applies an explicit deny override.

{

"Version": "2012-10-17",

"Statement": [

{

"Effect": "Allow",

"Action": [

"s3:GetObject",

"s3:ListBucket"

],

"Resource": [

"arn:aws:s3:::critical-data",

"arn:aws:s3:::critical-data/*"

],

"Condition": {

"IpAddress": {

"aws:SourceIp": "203.0.113.0/24"

}

}

}

]

}

Key AWS IAM concepts:

  • Principal : Entity requesting access (user, role, federated identity)

  • Action : Service operation being requested

  • Resource : ARN identifying the target resource

  • Condition : Contextual constraints (IP, time, MFA, TLS version)

  • Effect : Allow or Deny

Least Privilege with AWS

AWS Access Advisor shows service last-accessed information, helping identify unused permissions. IAM Access Analyzer generates policies based on CloudTrail access patterns.

Generate policy from CloudTrail activity

aws accessanalyzer create-analyzer --analyzer-name my-analyzer --type ACCOUNT

aws accessanalyzer start-policy-generation \

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'{"principalArn":"arn:aws:iam::123456789012:user/service-account"}' \

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'{"trails":[{"trailArn":"arn:aws:cloudtrail:us-east-1:123456789012:trail/management-trail"}],\

"startTime":"2026-01-01T00:00:00Z","endTime":"2026-05-01T00:00:00Z"}'

GCP IAM Roles

GCP IAM uses a different model: roles are collections of permissions assigned to principals at specific resource hierarchies.

// Organization level

organizations/123456789012/roles/customStorageAdmin

// Folder level

folders/987654321/roles/customInstanceAdmin

// Project level

projects/my-project/roles/customComputeAdmin

Create a custom GCP IAM role

gcloud iam roles create customComputeAdmin \

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compute.instances.stop,compute.instances.list \

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Bind role to a service account at the project level

gcloud projects add-iam-policy-binding my-project \

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Policy Simulation

Both AWS and GCP provide policy simulation tools to verify permissions before deployment.

AWS IAM policy simulation

aws iam simulate-principal-policy \

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GCP policy troubleshooter

gcloud policy-intelligence query-activity \

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Common IAM Misconfigurations

  • Wildcard permissions : "Action": ["*"] grants access to all services

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Conclusion

Cloud IAM requires continuous attention. Implement least privilege by starting with minimal permissions and expanding based on demonstrated need. Use policy simulation tools before deploying changes, audit permissions regularly with Access Analyzer and policy intelligence tools, and enforce conditions like MFA and source IP restrictions wherever possible.