CDN Security Policy Provisioning for DDoS Mitigation
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Solution Overview
Problem
Content Delivery Networks (CDNs) face challenges in securing streaming content from attacks such as HTTP GET flooding Distributed Denial of Service (DDoS) due to the inability of conventional Web Application Firewalls (WAFs) to effectively validate requests based on state information and detect malicious behaviors, leading to vulnerabilities in edge servers and content delivery infrastructure.
Innovation Solution
Implementing a method for automatic provisioning of security policies within a CDN that involves obtaining a manifest, determining security policies based on user and content information, updating firewall rules, and applying these rules to validate requests, including rules for detecting malformed and repeated requests, thereby enhancing security and reducing resource overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Web Application Firewalls are used to filter requests, then basic security protection is provided, but they cannot effectively validate requests based on state information and detect malicious behaviors
Solution Approach 1:
The system performs preliminary actions by obtaining manifest information about the streaming content before validating fragment requests. The firewall rules are pre-configured with state information including manifest details, URL patterns, and expected request sequences, enabling effective detection of malicious behaviors without complex runtime analysis
Solution Approach 2:
The system implements feedback mechanisms by continuously monitoring request patterns and comparing them against expected behavior derived from manifest information. The firewall dynamically adjusts its validation based on feedback from detected anomalies, improving security protection while maintaining manageable rule complexity
2Reliability
If firewall rules are updated to validate all requests thoroughly, then security against DDoS attacks improves, but resource consumption increases
Solution Approach 1:
The system applies local quality by validating requests differently based on their specific characteristics. Critical requests involving manifest information and initial fragment requests undergo thorough validation using state information, while routine requests use simplified validation. This selective approach provides strong DDoS protection where needed while minimizing resource consumption
Solution Approach 2:
The system performs partial validation by focusing security checks on the most critical aspects of requests rather than analyzing every detail. The firewall validates essential elements such as URL patterns, request sequences, and manifest consistency, while skipping less critical validations, thereby achieving effective DDoS protection with reduced resource overhead
3Measurement precision
If state information is used to validate requests, then detection of malformed and repeated requests improves, but processing overhead increases
Solution Approach 1:
The system performs preliminary action by extracting and storing state information from manifest files before request validation begins. Expected URL patterns, fragment sequences, and content characteristics are pre-analyzed and cached, enabling rapid detection of malformed and repeated requests without time-consuming processing during request validation
Solution Approach 2:
The system uses copying by creating simplified representations of the manifest information and expected request patterns. These copies are stored in easily accessible formats that enable rapid comparison against actual requests, improving detection accuracy while minimizing processing time through efficient data structures and caching mechanisms
Data Source
AI summary
Methods and systems for automatic provisioning of security policies for content streaming control within a Content Delivery Network (CDN) are provided. According to one aspect, a method for automatic provisioning of security policies for content streaming control by a network node within a CDN that supports at least one streaming media protocol comprises: obtaining a manifest, the manifest being generated in response to a user requesting a streaming content from the CDN; determining a first security policy associated with the user and/or the requested streaming content in accordance with the manifest; updating a set of firewall rules for implementing security policies in accordance with the determined first security policy; and applying the updated set of firewall rules to validate requests from the user for the streaming content. The policies are dynamically configured and may be sparsely provisioned, e.g., downloaded only to the pertinent nodes and activated only when necessary.