CloudTrail for API auditing in AWS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is AWS CloudTrail?

AWS CloudTrail is a service that records API calls made in your AWS account. It helps you track who did what, when, and from where.

beginner

Why is CloudTrail important for API auditing?

CloudTrail provides a history of API calls, which helps detect unauthorized actions, troubleshoot issues, and meet compliance requirements.

intermediate

What types of events does CloudTrail record?

CloudTrail records management events (like creating or deleting resources) and data events (like reading or writing data in S3 buckets).

intermediate

How does CloudTrail deliver logs?

CloudTrail delivers logs to an Amazon S3 bucket you specify. You can also send logs to CloudWatch Logs for real-time monitoring.

advanced

What is a best practice when setting up CloudTrail for API auditing?

Enable multi-region trails to capture API activity across all regions, and protect your S3 bucket with proper permissions to secure your logs.

What does AWS CloudTrail primarily record?

A API calls made in your AWS account

B CPU usage of EC2 instances

C Network traffic between AWS services

D Billing and cost reports

CloudTrail records API calls, which helps track user activity and changes in your AWS environment.

Where does CloudTrail store its log files by default?

A AWS Lambda function

B Amazon RDS database

C Amazon S3 bucket

D Amazon DynamoDB table

CloudTrail delivers logs to an Amazon S3 bucket you specify for storage and analysis.

Which CloudTrail event type records actions like reading data from an S3 bucket?

A Data events

B Billing events

C Management events

D Security events

Data events include operations on resources like reading or writing data in S3 buckets.

Why should you enable multi-region trails in CloudTrail?

A To automatically fix security issues

B To reduce storage costs

C To speed up EC2 instance launches

D To capture API activity across all AWS regions

Multi-region trails ensure you capture API calls made in any AWS region, giving a complete audit trail.

How can you monitor CloudTrail logs in real time?

A Store logs in Amazon S3 only

B Send logs to Amazon CloudWatch Logs

C Use AWS Config

D Enable AWS Shield

Sending CloudTrail logs to CloudWatch Logs allows real-time monitoring and alerting on API activity.

Explain how AWS CloudTrail helps with API auditing and security.

Think about how tracking actions helps keep your cloud safe.

Describe best practices for setting up CloudTrail to ensure effective API auditing.

Consider how to get complete logs and keep them safe.

Practice

1. What is the primary purpose of AWS CloudTrail?

easy

A. To manage user permissions and roles

B. To store website files and images

C. To record API calls for auditing and security

D. To monitor server CPU usage

Solution

1. Step 1: Understand CloudTrail's role

   CloudTrail is designed to record all API calls made in an AWS account for auditing and security purposes.

2. Step 2: Compare other options

   The other options describe other AWS services or functions unrelated to CloudTrail's main purpose.

3. Final Answer:

   To record API calls for auditing and security -> Option C

4. Quick Check:

   CloudTrail = API call recording [OK]

Hint: CloudTrail tracks API calls, not files or CPU [OK]

Common Mistakes:

• Confusing CloudTrail with S3 storage
• Thinking CloudTrail manages permissions
• Assuming CloudTrail monitors server health

2. Which AWS service is used to store CloudTrail logs?

easy

A. Amazon S3

B. Amazon EC2

C. Amazon RDS

D. AWS Lambda

Solution

1. Step 1: Identify CloudTrail log storage

   CloudTrail stores its logs in an Amazon S3 bucket that you specify during setup.

2. Step 2: Eliminate other services

   Amazon EC2 is for virtual servers, RDS is for databases, and Lambda runs code; none store CloudTrail logs.

3. Final Answer:

   Amazon S3 -> Option A

4. Quick Check:

   CloudTrail logs go to S3 buckets [OK]

Hint: CloudTrail logs always go to S3 buckets [OK]

Common Mistakes:

• Choosing EC2 as storage
• Confusing Lambda with log storage
• Selecting RDS for logs

3. Given this CloudTrail event selector configuration:

{"ReadWriteType": "WriteOnly"}

Which API calls will CloudTrail log?

medium

A. Only read API calls

B. Only write API calls

C. Both read and write API calls

D. No API calls

Solution

1. Step 1: Understand ReadWriteType setting

   The "WriteOnly" setting means CloudTrail logs only API calls that change resources (write operations).

2. Step 2: Interpret options

   This logs only write API calls. Read-only and both read/write options include read calls, which are excluded. 'No API calls' means no logging, which is incorrect.

3. Final Answer:

   Only write API calls -> Option B

4. Quick Check:

   WriteOnly = write calls logged [OK]

Hint: WriteOnly logs only changes, not reads [OK]

Common Mistakes:

• Confusing WriteOnly with ReadOnly
• Assuming both read and write are logged
• Thinking no calls are logged

4. You configured CloudTrail but notice no logs are delivered to your S3 bucket. What is a likely cause?

medium

A. CloudTrail only logs read API calls by default

B. CloudTrail does not support logging API calls

C. CloudTrail logs are stored in EC2 instances by default

D. The S3 bucket policy blocks CloudTrail from writing logs

Solution

1. Step 1: Check S3 bucket permissions

   If the bucket policy blocks CloudTrail, logs cannot be delivered, causing no logs to appear.

2. Step 2: Eliminate incorrect causes

   CloudTrail does support logging API calls, logs are not stored on EC2 instances by default, and it logs both read and write API calls by default (not only read).

3. Final Answer:

   The S3 bucket policy blocks CloudTrail from writing logs -> Option D

4. Quick Check:

   Bucket policy must allow CloudTrail writes [OK]

Hint: Check S3 bucket policy if logs don't appear [OK]

Common Mistakes:

• Assuming CloudTrail logs to EC2
• Thinking CloudTrail doesn't log API calls
• Believing default logs are read-only

5. You want to audit only management events for your AWS account using CloudTrail. Which configuration should you use?

hard

A. Enable CloudTrail with event selectors set to log only management events

B. Enable CloudTrail with logging only data events on S3 buckets

C. Disable CloudTrail and use CloudWatch logs instead

D. Enable CloudTrail with event selectors set to log only read-only events

Solution

1. Step 1: Understand management events

   Management events track control plane operations like creating or deleting resources.

2. Step 2: Select correct event selector

   Setting event selectors to log only management events ensures auditing of these API calls.

3. Step 3: Eliminate other options

   Enable CloudTrail with logging only data events on S3 buckets logs data events, not management events. Disable CloudTrail and use CloudWatch logs instead disables CloudTrail, losing audit logs. Enable CloudTrail with event selectors set to log only read-only events logs only read-only events, missing write management events.

4. Final Answer:

   Enable CloudTrail with event selectors set to log only management events -> Option A

5. Quick Check:

   Management events = control plane API logs [OK]

Hint: Use event selectors to log management events only [OK]

Common Mistakes:

• Confusing data events with management events
• Disabling CloudTrail thinking CloudWatch suffices
• Logging only read-only events misses writes