Stateless Login CSRF Prevention via Dual-Token Validation
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Solution Overview
Problem
Web applications that rely on state-changing operations are vulnerable to login cross-site request forgery, as attackers can trick users into logging into attacker-controlled accounts, compromising sensitive information, especially in sites like search engines or customer relationship management systems, where defenses are hindered by the lack of session tokens for unlogged users.
Innovation Solution
Implementing a stateless prevention method by sending a first token in a custom header and a second token in a GET parameter of the login page, where the custom header is modifiable only via the related domain name, ensuring that only matching tokens establish a session, thereby preventing unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a web application provides a token as a required parameter for logging in, then login protection is improved, but an attacker can easily reuse the required parameter in the attacker's login parameters
Solution Approach 1:
The patent divides the token into two separate components: a first token sent in a custom header and a second token sent in a GET parameter. The server validates that both tokens are present and match before establishing a session. This segmentation prevents attackers from reusing a single token because they would need to obtain both the custom header token and the GET parameter token simultaneously, which is infeasible without access to the user's browser.
Solution Approach 2:
The patent introduces a domain-specific custom header as an intermediary between the user agent and the server. This custom header carries the first token and is validated by the server alongside the second token from the GET parameter. The intermediary mechanism ensures that tokens are properly associated with the domain and cannot be arbitrarily reused by attackers from different domains.
2Reliability
If the web application sends a token to prevent login attacks, then security is improved, but the user must already be logged in to receive the token
Solution Approach 1:
The patent implements preliminary action by sending both the first token (in custom header) and the second token (in GET parameter) along with the login page itself, before the user actually logs in. This allows the tokens to be distributed to the user's browser in advance, so they are ready when the user submits the login form. The server then validates these pre-distributed tokens during the login process, providing security without requiring the user to be already logged in.
3Reliability
If the web application uses state-changing operations for security, then authentication is improved, but the system becomes vulnerable to cross-site request forgery
Solution Approach 1:
The patent implements a stateless authentication mechanism where the user's browser automatically includes the custom header with the first token in the login request. The server validates this token along with the second token from the GET parameter without needing to maintain session state. This self-service approach, where the browser automatically provides the authentication token, prevents cross-site request forgery while maintaining authentication security, as the custom header cannot be forged by external sites.
Data Source
AI summary
A web application receives a request for a web site's login page. The web application sends, via a domain name, a response including the login page, a first token in a first field in the login page's header, and a second token in a second field in the login page's header, wherein the first field is modifiable only via a related domain name which is related to the domain name, and wherein the first token is a function of the second token. The web application receives a request to login to the site from a client, wherein the request to login includes a header that includes the first field and the second field. The web application establishes a session with the client if the first field in the header includes a token which is the function of a token in the second field in the header.