The kernel enforces this policy by blocking execution of everything that doesn't meet the set policy.Ī concern with a code integrity policy is that unless the policy is perfectly correct, it can block critical software in production and cause an outage. A code integrity policy consists of a set of authorization indicators, either code signing certificates or SHA256 file hashes, which the kernel matches before loading or executing a binary or script.Ĭode Integrity allows a system administrator to define a policy that authorizes only binaries and scripts that have been signed by particular certificates or match specified SHA256 hashes. Similar systems, such as DM-Verity, exist for Linux. Code integrity can apply a strict execution control policy whenever a driver or a dynamically linked library (DLL) is loaded, an executable binary is executed, or a script is run. Code integrity as an authorization gateĬode integrity is a kernel level service that became available starting in Windows Server 2016. Code integrity helps us achieve that guarantee. We need to guarantee that the software we deploy has flowed through this process. ![]() This process includes access control to source code, conducting peer code reviews, doing static analysis for security vulnerabilities, following Microsoft’s Security Development Lifecycle (SDL), and conducting functional and quality testing. Adding an authorization gateĪzure uses a rich engineering process that implements gates on the security, compliance, and quality of the software we deploy. This presents a large attack surface that cannot be managed through business processes alone. We have thousands of servers running software developed and maintained by thousands of engineers. In Azure, we face the same challenge and at significant complexity. ![]() Quality risk from externally developed software, which may not meet the operational requirements of the business.Compliance risks when the approved change management process isn't used to bring in new software.Security risks such as dedicated attack tools, custom malware, and third-party software with known vulnerabilities.Unauthorized software presents several risks to any business: A significant challenge in operating a complex system like Microsoft Azure is ensuring that only authorized software is running in the system.
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