IAM Policies, Access Methods, Roles & Security Tools

1. IAM Policies

Definition:

IAM Policies are JSON-based documents that define permissions — what actions are allowed or denied on specific AWS resources.

Key Elements:

Version – Policy language version ("2012-10-17")
Statement – One or more permission blocks
Effect – Allow or Deny
Action – AWS actions like s3:ListBucket, ec2:StartInstances
Resource – ARN of AWS resource
Condition (optional) – Adds constraints like IP, MFA, or time-based rules

Example Policy — Read Access to S3 Bucket

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

2. Ways to Access AWS

Method	Description	Use Case
AWS Management Console	Web-based UI for managing AWS resources.	Beginners or quick configuration
AWS CLI (Command Line Interface)	Command-line tool using access keys.	Scripting, automation, DevOps workflows
AWS SDKs	Language-specific APIs (Python, Node.js, Java, etc.)	Application-level AWS integration
AWS CloudShell	Browser-based CLI with preconfigured credentials	Quick CLI use without local setup
AWS Tools for PowerShell	PowerShell commands to manage AWS	Windows admins & automation
AWS API	Direct HTTPS calls to AWS services	Advanced automation or integrations

3. IAM Roles

Definition: