Windows Application UIAccess

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已于 2023-09-07 15:09:16 修改 · 4.3k 阅读

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于 2016-04-08 16:44:53 首次发布

Windows UIAutomation 提供了比MSAA更好的辅助功能支持。UIAccess属性允许自动化程序绕过UIPI限制，但存在安全风险。UIA程序需数字签名，并通常仅从特定保护路径运行。创建子进程时，可能需要限制其完整性级别以降低权限。

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Windows Application UIAccess

windows Vista之后应用程序引入了一个新的属性UIAccess。

UIAccess for UI automation applications

Microsoft UI automation is the Windows Vista model to support accessibility requirements with improvements over the earlier model, known as Microsoft Active Accessibility (MSAA). Applications designed to support accessible user experience control the behavior of other Windows applications on behalf of the user. When all applications (the automation client and server) are running as a standard user, that is, at a medium integrity level, the UIPI restrictions do not interfere with the UI automation model.

However, there may be times when an administrative user runs an application with elevated privilege based on UAC in Admin Approval Mode. The UI automation program will not be able to drive the graphics UI of elevated applications on the desktop without the ability to bypass restrictions that UIPI implements. The ability to bypass UIPI restrictions on SendMessage across privilege levels is available for UI automation programs using a special security attribute in the program’s application manifest, known asUIAccess.

The following is an example of an application manifest entry for a UIAccess program.