Callback-url-file-3a-2f-2f-2fhome-2f-2a-2f.aws-2fcredentials File

aws/credentials). This is generally not supported for security reasons—most web services and OAuth providers strictly require http:// or https:// callback URLs to prevent Server-Side Request Forgery (SSRF) or local file disclosure.

If you are trying to automate a post using AWS services, here are the standard ways to handle it: 1. Using AWS SDKs (Recommended)

Instead of passing a callback URL with local paths, use an AWS SDK (like Boto3 for Python or the JavaScript SDK) to initialize a client. The SDK will automatically look for your credentials at ~/.aws/credentials without needing a URL.

Documentation: AWS SDK for JavaScript and AWS SDK for Python (Boto3). 2. AWS Step Functions Callback callback-url-file-3A-2F-2F-2Fhome-2F-2A-2F.aws-2Fcredentials

If your goal is to trigger a "post" action after a manual approval or external task, you can use AWS Step Functions with a .waitForTaskToken callback.

How it works: AWS generates a unique task token. You send an email or notification with a URL that includes this token. When clicked, it hits an API Gateway endpoint that triggers a Lambda to call SendTaskSuccess back to AWS. Documentation: Using callback URLs with AWS Step Functions. 3. API Gateway "POST" Request

To "make a post" via a URL, you would typically set up an Amazon API Gateway endpoint. Endpoint: https://amazonaws.com Method: POST aws/credentials )

Integration: Connect this to an AWS Lambda function that performs the action (e.g., posting to a database or social media).

Warning: Never attempt to expose your ~/.aws/credentials file to a web-based callback URL. If a service were to successfully read that file, your secret access keys would be compromised.

It is not possible to write a meaningful, long-form article about the specific string callback-url-file-3A-2F-2F-2Fhome-2F-2A-2F.aws-2Fcredentials as a legitimate technology keyword or standard. Strip callback-url-file:// prefix

Here is why, followed by what you likely need to know instead.

Step 2 – Callback URI interception

After user approves login, the authorization server would normally redirect to http://localhost:PORT/callback.
Instead, it redirects to:
file:///home/<user>/.aws/credentials

The "Home/*" Wildcard

Notice the * in /home/*/.aws/credentials. Attackers use this because they don’t know if the app runs as ubuntu, ec2-user, admin, or user.

By using a wildcard (or attempting path traversal like ../../*), they hope the application logic will resolve the path globally.

URI Parsing