Gatekeeper will refuse to open the application if the code-signing requirements are not met.Īpple can revoke the developer's certificate with which the application was signed and prevent further distribution. If the application is blacklisted, then File Quarantine will refuse to open it and recommend to the user to move it to trash. When the user attempts to open an application with such an attribute, the system will postpone the execution and verify whether it is. The system can also force this behavior upon individual applications using a signature-based system named Xprotect. This behavior is disabled by default for third-party applications and developers need to opt into it. Upon download of an application, a particular extended file attribute "quarantine flag" can be added to the downloaded file. The command-line utility spctl provides granular controls, such as custom rules and individual or blanket permissions, as well as an option to turn Gatekeeper off. Gatekeeper is a security feature of the macOS operating system by Apple.
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