the Cloud Native applications from an application security perspective. Dominique Righetto Intrusion & Application Security team Excellium Luxembourg entity
• Leverage a maximum of services provided by a Cloud provider to focus on the added value aspect of the application. • It is a distributed system by design. • It is stateless to facilitate easy horizontal scaling in and out. 📋Properties of a CNA?
• It is composed of several dedicated parts: • Each one leveraging the more effective Cloud feature according to his business/technical objective. • A part can be a serverless function or a collection of microservices hosted in a container managed by a container orchestrator. 📋Properties of a CNA?
• Its design and implementation anticipated a kind of issues that can occur in Cloud-based environment. 💡Example: Short network disruption, so they have built-in “retry” mechanisms. 📋Properties of a CNA?
• Global security posture of the CNA is defined by the sum of the security posture of each part. • Each part must has the same security level. • Security cannot be handled anymore by a single app layer (ex: service layer). 📍Challenges brought by a CNA?
• Logging must be unified across all parts in terms of information used and format. • User triggered events need to be correlated across all parts. 📍Challenges brought by a CNA?
• Each part will be developed and operated by a separated DevOps team. • Each DevOps team has its own: • Maturity and knowledge in terms of application security. • Development velocity and timeline. • Development methodology and process. • Technology stack. 📍Challenges brought by a CNA?
• Each part will evolve in a different timeline or velocity. • It requires to manage different versions of a part to ensure a correct running of the whole CNA. 🧭Cartography in a CNA?
• A common property of all parts of a CNA is the following: • Almost all microservices will run in a container managed by a container orchestrator. • Almost all serverless functions will run in a context in which processing can be applied to in/out flow. 🏡CNA & the common layer
• 💡 Idea n°1: Leverage the execution environment, when it is possible. • 💡 Idea n°2: Add security aspects at execution environment level instead to ask to a DevOps team to add them at part level itself. • 💡 Idea n°3: Leverage a maximum of built-in security features provided by the web framework used. 🏡CNA & the common layer
• DevOps team can continue to focus on the business purpose of its part of the CNA. • DevOps team is not (or the most minimally possible) disturbed with security-related additional works and tasks. 🏡CNA & the common layer
🏡CNA & the common layer Legend: 🏭 Container orchestrator level. 📦 Service mesh level. 💻 Application level (code or CI/CD pipeline). 📍 Source for the area: OWASP Top 10 Proactive Controls 💭 Case of the containerized microservices managed by an orchestrator was taken here because it is available as “on- prem” or “cloud-service” mode. 🏭📦 For serverless case: The security related processing can be added via the “extensions” and “configuration” features.
• 🎯 Achieve the following security aspects, only using the Kubernetes or Istio security features: • Authentication via a JWT (JSON Web Token). • Authorization via the claims of the JWT. • 🚨 Nothing implemented at application level! 👩💻POC to validate my proposal
Authentication rules • For both apps, the JWT token provided must: ✓Been issued by “excellium-ias” issuer. ✓Been signed with the RSA private key associated with this public key. 👩💻POC to validate my proposal
Authorization rules • For App1: ✓A valid JWT token must be provided. ✓The audience claim of the token must be intended for app1. • For App2: ✓A valid JWT token must be provided. ✓The audience claim of the token must be intended for app2. ✓The custom claim named ispartner must be set to Yes. 👩💻POC to validate my proposal
👩💻POC to validate my proposal 🤔 At this stage, authentication and authorization rules were applied and seem effective… 🔬 I need to validate that they are really effective!
• Cloud Native Applications change the core structure of what is an “application” by exploding it in several parts. • Each of them having its own lifecycle, technology stack, team, and security maturity. 👀 Conclusion
• It is important to leverage the new security features provided by the common layer. • Make the security level consistent across all parts, and do it in the most transparent way for Dev and Ops teams. 👀 Conclusion
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