Merge pull request #5442 from MicrosoftEdge/api-IsEnhancedSecurityModeEnabled

API introduction: CoreWebView2Profile.EnhancedSecurityModeLevel

Author: GittyHarsha

specs/EnhancedSecurityModeLevel.md

@@ -0,0 +1,148 @@
+EnhancedSecurityModeLevel
+===
+
+# Background
+
+Enhanced Security Mode (ESM) is a Microsoft Edge security feature that reduces 
+the risk of memory-related vulnerabilities by disabling JavaScript Just-in-Time 
+(JIT) compilation and enabling additional operating system protections.
+
+In WebView2, ESM is off by default to avoid performance impact. You can enable 
+ESM for stricter security when rendering untrusted sites. While this improves
+security, it may reduce JavaScript performance.
+
+In Microsoft Edge, ESM offers two levels:
+
+- Balanced – Enhanced security is used for unfamiliar sites based on browser usage patterns.
+- Strict – Enhanced security is used for all sites.
+
+![image](https://github.com/MicrosoftEdge/WebView2Feedback/assets/82386753/35977716-e46c-4257-82da-906b0c6f833e)
+
+Unlike Microsoft Edge, WebView2 does not support the heuristic-based "Balanced" 
+level; only Off and Strict are available.
+
+Today, the ESM level in WebView2 can be set only at environment creation by using
+the `--sdsm-state` browser feature flag ([webview2 browser flag docs](https://learn.microsoft.com/en-us/microsoft-edge/webview2/concepts/webview-features-flags?tabs=dotnetcsharp)). 
+The setting applies globally to all profiles and cannot be changed at runtime.
+
+This proposal introduces an API to configure the Enhanced Security Mode level. 
+The configuration is not persisted to the user data folder. The property is reset when the profile is recreated.
+
+# Description
+
+The `EnhancedSecurityModeLevel` property allows you to control the Enhanced Security 
+Mode level for WebView2 instances associated with a profile. This level applies to the context of the profile. That is, all WebView2s sharing the same profile are affected.
+The configuration is not persisted to the user data folder. The property is reset when the profile is recreated.
+
+The default value is `COREWEBVIEW2_ENHANCED_SECURITY_MODE_LEVEL_OFF`.
+
+When set to `Off`, Enhanced Security Mode is completely disabled. When set to 
+`Strict`, the feature is enabled and applies strict security policies to all sites.
+
+See `COREWEBVIEW2_ENHANCED_SECURITY_MODE_LEVEL` for descriptions of levels.
+
+Changes apply to future navigations; a reload may be required for the change to take effect.
+
+# Examples
+
+## Setting the ESM Level
+
+Set Enhanced Security Mode level for a profile.
+
+```c#
+void SetEnhancedSecurityModeLevel(CoreWebView2EnhancedSecurityModeLevel value)
+{
+    var profile = webView2.CoreWebView2.Profile;
+    profile.EnhancedSecurityModeLevel = value;
+    MessageBox.Show(this,
+        "Enhanced Security Mode level is set successfully",
+        "Enhanced Security Mode");
+}
+```
+
+```cpp
+void SettingsComponent::SetEnhancedSecurityModeLevel(
+    COREWEBVIEW2_ENHANCED_SECURITY_MODE_LEVEL value)
+{
+    wil::com_ptr<ICoreWebView2_13> webView2_13;
+    webView2_13 = m_webView.try_query<ICoreWebView2_13>();
+
+    if (webView2_13)
+    {
+        wil::com_ptr<ICoreWebView2Profile> profile;
+        CHECK_FAILURE(webView2_13->get_Profile(&profile));
+
+        auto profile12 = profile.try_query<ICoreWebView2Profile12>();
+        if (profile12)
+        {
+            CHECK_FAILURE(profile12->put_EnhancedSecurityModeLevel(value));
+            MessageBox(
+                nullptr,
+                L"Enhanced Security Mode level is set successfully",
+                L"Enhanced Security Mode", MB_OK);
+        }
+    }
+}
+```
+
+# API Details
+
+```
+/// Enhanced Security Mode levels.
+[v1_enum]
+typedef enum COREWEBVIEW2_ENHANCED_SECURITY_MODE_LEVEL {
+  /// Enhanced Security Mode is turned off.
+  COREWEBVIEW2_ENHANCED_SECURITY_MODE_LEVEL_OFF,
+  /// Enhanced Security Mode is enabled in Strict level. Disables JavaScript 
+  /// Just-in-Time (JIT) compilation and enables additional operating system protections.
+  ///
+  /// This level applies enhanced security for all sites but may reduce JavaScript performance.
+  ///
+  /// See [Browsing more safely with Microsoft Edge](https://learn.microsoft.com/en-us/DeployEdge/microsoft-edge-security-browse-safer)
+  /// for more details about Enhanced Security Mode.
+  COREWEBVIEW2_ENHANCED_SECURITY_MODE_LEVEL_STRICT,
+} COREWEBVIEW2_ENHANCED_SECURITY_MODE_LEVEL;
+
+/// Extension of ICoreWebView2Profile to control Enhanced Security Mode (ESM) level.
+///
+/// ESM reduces the risk of memory-related vulnerabilities by disabling JavaScript
+/// Just-in-Time (JIT) compilation and enabling additional operating system protections.
+/// This property applies to all WebView2 instances sharing the same profile.
+/// The configuration is not persisted to the user data folder.
+/// The property is reset when the profile is recreated.
+///
+/// See `COREWEBVIEW2_ENHANCED_SECURITY_MODE_LEVEL` for descriptions of levels.
+///
+/// Changes apply to future navigations; reload may be required.
+///
+/// Enabling ESM improves security but may reduce JavaScript performance.
+[uuid(450fab50-f6d8-4517-baea-964ec12d5c8c), object, pointer_default(unique)]
+interface ICoreWebView2Profile12 : IUnknown {
+  /// Gets the `EnhancedSecurityModeLevel` property.
+  [propget] HRESULT EnhancedSecurityModeLevel([out, retval] COREWEBVIEW2_ENHANCED_SECURITY_MODE_LEVEL* value);
+
+  /// Sets the `EnhancedSecurityModeLevel` property.
+  [propput] HRESULT EnhancedSecurityModeLevel([in] COREWEBVIEW2_ENHANCED_SECURITY_MODE_LEVEL value);
+}
+```
+
+```c# (but really MIDL3)
+namespace Microsoft.Web.WebView2.Core
+{
+    enum CoreWebView2EnhancedSecurityModeLevel
+    {
+        Off = 0,
+        Strict = 1
+    };
+
+    runtimeclass CoreWebView2Profile
+    {
+        // ...
+        [interface_name("Microsoft.Web.WebView2.Core.ICoreWebView2Profile12")]
+        {
+            // ICoreWebView2Profile12 members
+            CoreWebView2EnhancedSecurityModeLevel EnhancedSecurityModeLevel { get; set; };
+        }
+    }
+}
+```