stealth: gate JS behaviours, upgrade wreq, fix fp consistency

wreq upgraded to 6.0.0-rc.29 and wreq-util to 3.0.0-rc.12 to apply the
latest Chrome 145 TLS fingerprint (16 cipher suites, proper extension
order, ALPS, GREASE).

__obscura_stealth global variable introduced and passed from Rust to JS,
allowing stealth-specific JS behaviors to run only when the stealth flag
is enabled.

Tightened hardwareConcurrency and deviceMemory pools in stealth mode
to desktop-realistic values (e.g. min 4GB RAM, 4 cores), eliminating
mobile-tier values that leak the spoof.

navigator.userAgentData and getHighEntropyValues() are now overridden
in stealth mode to perfectly match the sec-ch-ua header sent by
wreq_util::Profile::Chrome145.

Fixed usedJSHeapSize sometimes exceeding totalJSHeapSize.

crates/obscura-browser/src/page.rs

@@ -275,6 +275,7 @@ impl Page {
 
         #[cfg(feature = "stealth")]
         if self.stealth_client.is_some() {
+            rt.set_stealth(true);
             rt.set_user_agent(obscura_net::STEALTH_USER_AGENT);
             // Match platform to the Linux UA so navigator.platform and
             // userAgentData.platform are consistent with navigator.userAgent.
@@ -315,6 +316,8 @@ impl Page {
             rt.set_dom(dom);
         }
 
+        rt.run_page_init();
+
         self.js = Some(rt);
     }
 

crates/obscura-js/js/bootstrap.js

@@ -14,6 +14,7 @@
     '__obscura_errors', '__obscura_init', '__obscura_hide_list',
     '__obscura_objects', '__obscura_oid', '__obscura_ua',
     '__obscura_platform', '__obscura_ua_platform', '__obscura_ua_platform_version',
+    '__obscura_stealth',
     '__documentReadyState__', '__currentUrl',
     // internal helpers (var-declared throughout the file)
     '__processDynScriptQueue', '_markNative', '_fpRand', '_fpNoise',
@@ -2579,7 +2580,7 @@ globalThis.navigator = {
   vendor: "Google Inc.", product: "Gecko", productSub: "20030107",
   doNotTrack: null,
   deviceMemory: 8,
-  connection: { effectiveType: "4g", rtt: 50, downlink: 10, saveData: false, onchange: null, addEventListener(){}, removeEventListener(){}, dispatchEvent(){return true;} },
+  connection: { effectiveType: "4g", type: "wifi", rtt: 50, downlink: 10, saveData: false, onchange: null, addEventListener(){}, removeEventListener(){}, dispatchEvent(){return true;} },
   pdfViewerEnabled: true,
   get plugins() {
     const p = new PluginArray([
@@ -2604,7 +2605,7 @@ globalThis.navigator = {
     brands: [
       {brand: "Google Chrome", version: "145"},
       {brand: "Chromium", version: "145"},
-      {brand: "Not=A?Brand", version: "24"},
+      {brand: "Not;A=Brand", version: "24"},
     ],
     mobile: false,
     get platform() { return globalThis.__obscura_ua_platform || "Windows"; },
@@ -2612,8 +2613,8 @@ globalThis.navigator = {
       return Promise.resolve({
         architecture: "x86",
         bitness: "64",
-        brands: [{brand:"Google Chrome",version:"145"},{brand:"Chromium",version:"145"},{brand:"Not=A?Brand",version:"24"}],
-        fullVersionList: [{brand:"Google Chrome",version:"145.0.0.0"},{brand:"Chromium",version:"145.0.0.0"},{brand:"Not=A?Brand",version:"24.0.0.0"}],
+        brands: [{brand:"Google Chrome",version:"145"},{brand:"Chromium",version:"145"},{brand:"Not;A=Brand",version:"24"}],
+        fullVersionList: [{brand:"Google Chrome",version:"145.0.0.0"},{brand:"Chromium",version:"145.0.0.0"},{brand:"Not;A=Brand",version:"24.0.0.0"}],
         mobile: false,
         model: "",
         platform: globalThis.__obscura_ua_platform || "Windows",
@@ -5902,6 +5903,32 @@ if (typeof navigator.credentials === 'undefined') {
   navigator.credentials = { get(){return Promise.resolve(null);}, create(){return Promise.resolve(null);}, store(){return Promise.resolve();}, preventSilentAccess(){return Promise.resolve();} };
 }
 
+navigator.mediaCapabilities = {
+  decodingInfo(cfg) {
+    return Promise.resolve({ supported: true, smooth: true, powerEfficient: true, keySystemAccess: null, configuration: cfg });
+  },
+  encodingInfo(cfg) {
+    return Promise.resolve({ supported: true, smooth: true, powerEfficient: true, configuration: cfg });
+  },
+};
+navigator.locks = {
+  request(name, opts, cb) {
+    if (typeof opts === 'function') { cb = opts; opts = {}; }
+    if (typeof cb === 'function') return Promise.resolve(cb({ name, mode: (opts && opts.mode) || 'exclusive' }));
+    return Promise.resolve(null);
+  },
+  query() { return Promise.resolve({ held: [], pending: [] }); },
+};
+navigator.keyboard = {
+  getLayoutMap() { return Promise.resolve(new Map()); },
+  lock() { return Promise.resolve(); },
+  unlock() {},
+};
+navigator.gpu = { requestAdapter() { return Promise.resolve(null); } };
+navigator.wakeLock = { request() { return Promise.reject(new DOMException('Not allowed', 'NotAllowedError')); } };
+navigator.share = function(data) { return Promise.reject(new DOMException('Not allowed', 'NotAllowedError')); };
+navigator.canShare = function() { return false; };
+
 globalThis.opener = null;
 
 globalThis.Worker = class Worker {
@@ -5990,16 +6017,16 @@ URL.revokeObjectURL = function(url) {
 globalThis.scrollTo = function(x, y) {};
 globalThis.scrollBy = function(x, y) {};
 globalThis.scroll = function(x, y) {};
-globalThis.focus = function() {};
-globalThis.blur = function() {};
-globalThis.print = function() {};
-globalThis.alert = function() {};
-globalThis.confirm = function() { return true; };
-globalThis.prompt = function() { return null; };
-globalThis.open = function() { return null; };
-globalThis.close = function() {};
-globalThis.stop = function() {};
-globalThis.postMessage = function() {};
+globalThis.focus = function() {}; _markNative(globalThis.focus);
+globalThis.blur = function() {}; _markNative(globalThis.blur);
+globalThis.print = function() {}; _markNative(globalThis.print);
+globalThis.alert = function() {}; _markNative(globalThis.alert);
+globalThis.confirm = function() { return true; }; _markNative(globalThis.confirm);
+globalThis.prompt = function() { return null; }; _markNative(globalThis.prompt);
+globalThis.open = function() { return null; }; _markNative(globalThis.open);
+globalThis.close = function() {}; _markNative(globalThis.close);
+globalThis.stop = function() {}; _markNative(globalThis.stop);
+globalThis.postMessage = function() {}; _markNative(globalThis.postMessage);
 globalThis.requestIdleCallback = globalThis.requestIdleCallback || function(cb) { return setTimeout(cb, 0); };
 globalThis.cancelIdleCallback = globalThis.cancelIdleCallback || function(id) { clearTimeout(id); };
 if (typeof ReadableStream === 'undefined') {
@@ -6453,20 +6480,45 @@ globalThis.__obscura_init = function() {
   globalThis.innerWidth = sw; globalThis.innerHeight = sh - 80;
   globalThis.outerWidth = sw; globalThis.outerHeight = sh;
 
-  var hwValues = [2, 4, 6, 8, 12, 16];
+  var hwValues = globalThis.__obscura_stealth ? [4, 6, 8, 12, 16] : [2, 4, 6, 8, 12, 16];
   globalThis.navigator.hardwareConcurrency = hwValues[Math.floor(_fpRand(400) * hwValues.length)];
-  var memValues = [0.25, 0.5, 1, 2, 4, 8];
+  var memValues = globalThis.__obscura_stealth ? [4, 8] : [0.25, 0.5, 1, 2, 4, 8];
   globalThis.navigator.deviceMemory = memValues[Math.floor(_fpRand(401) * memValues.length)];
 
   const t0 = Date.now() + Math.floor(_fpRand(641) * 100) - 50;
   globalThis.performance.timeOrigin = t0;
   globalThis.performance.timing = { navigationStart: t0, domContentLoadedEventEnd: t0, loadEventEnd: t0 };
+  var _totalHeap = 15000000 + Math.floor(_fpRand(620) * 85000000);
   globalThis.performance.memory = {
     jsHeapSizeLimit: 2172649472,
-    totalJSHeapSize: 15000000 + Math.floor(_fpRand(620) * 85000000),
-    usedJSHeapSize: 8000000 + Math.floor(_fpRand(621) * 42000000),
+    totalJSHeapSize: _totalHeap,
+    usedJSHeapSize: Math.floor(_totalHeap * (0.3 + _fpRand(621) * 0.5)),
   };
-  globalThis.Notification.permission = _fpRand(630) > 0.5 ? "granted" : "default";
+  globalThis.Notification.permission = "default";
+
+  if (globalThis.__obscura_stealth) {
+    var _stealthBrands = [
+      {brand: "Not:A-Brand", version: "99"},
+      {brand: "Google Chrome", version: "145"},
+      {brand: "Chromium", version: "145"},
+    ];
+    globalThis.navigator.userAgentData.brands = _stealthBrands;
+    globalThis.navigator.userAgentData.getHighEntropyValues = function(hints) {
+      return Promise.resolve({
+        architecture: "x86", bitness: "64",
+        brands: _stealthBrands,
+        fullVersionList: [
+          {brand:"Not:A-Brand",version:"99.0.0.0"},
+          {brand:"Google Chrome",version:"145.0.0.0"},
+          {brand:"Chromium",version:"145.0.0.0"},
+        ],
+        mobile: false, model: "",
+        platform: "Linux",
+        platformVersion: "6.1.0",
+        uaFullVersion: "145.0.0.0",
+      });
+    };
+  }
 
   // Hide internals (_*, obscura, Obscura). The set of keys is static at
   // snapshot-build time, so we precompute it ONCE below (after this

crates/obscura-js/src/runtime.rs

@@ -130,7 +130,7 @@ impl ObscuraJsRuntime {
         runtime
             .execute_script(
                 "<obscura:init>",
-                "globalThis.__obscura_objects = {}; globalThis.__obscura_oid = 0; globalThis.__obscura_init();".to_string(),
+                "globalThis.__obscura_objects = {}; globalThis.__obscura_oid = 0;".to_string(),
             )
             .expect("init should not fail");
 
@@ -220,6 +220,22 @@ impl ObscuraJsRuntime {
         );
     }
 
+    pub fn set_stealth(&mut self, enabled: bool) {
+        let _ = self.runtime.execute_script(
+            "<set-stealth>",
+            format!("globalThis.__obscura_stealth = {};", enabled),
+        );
+    }
+
+    /// Run __obscura_init() after all per-page properties (UA, platform, stealth, etc.)
+    /// have been set. Must be called once per page setup, after all set_* methods.
+    pub fn run_page_init(&mut self) {
+        let _ = self.runtime.execute_script(
+            "<obscura:page-init>",
+            "globalThis.__obscura_init();".to_string(),
+        );
+    }
+
     /// Override the coordinates the navigator.geolocation shim reports. The
     /// values are injected as numeric globals the bootstrap reads; when unset it
     /// keeps the built-in default. Callers validate the range before calling.

crates/obscura-net/Cargo.toml

@@ -23,14 +23,14 @@ tempfile = "3"
 # Emulation builder reshuffled). A caret requirement let a fresh resolve pull a
 # newer, incompatible rc and broke `cargo build --features stealth` (issue #234).
 # Pin exact versions so the build always resolves to the API wreq_client.rs targets.
-wreq-util = { version = "=3.0.0-rc.10", optional = true }
+wreq-util = { version = "=3.0.0-rc.12", optional = true }
 
 # `prefix-symbols` renames BoringSSL exports to avoid clashes with system OpenSSL,
 # but the renaming is only correct on Linux and Android (per wreq's README).
 # Enabling it on other platforms produces unresolved `build_script_main_*`
 # symbols at link time (see issue #39).
 [target.'cfg(any(target_os = "linux", target_os = "android"))'.dependencies]
-wreq = { version = "=6.0.0-rc.28", optional = true, features = ["prefix-symbols", "socks"] }
+wreq = { version = "=6.0.0-rc.29", optional = true, features = ["prefix-symbols", "socks"] }
 
 [target.'cfg(not(any(target_os = "linux", target_os = "android")))'.dependencies]
-wreq = { version = "=6.0.0-rc.28", optional = true, features = ["socks"] }
+wreq = { version = "=6.0.0-rc.29", optional = true, features = ["socks"] }

crates/obscura-net/src/wreq_client.rs

@@ -36,21 +36,13 @@ impl StealthHttpClient {
     }
 
     pub fn with_proxy(cookie_jar: Arc<CookieJar>, proxy_url: Option<&str>) -> Self {
-        // Issue #184: `set_default_paths()` reads OpenSSL's compile-time CA
-        // paths, which only resolve on Linux. On Windows the store ends up
-        // empty and every TLS handshake fails with CERTIFICATE_VERIFY_FAILED.
-        // `CertStore::default()` uses wreq's bundled Mozilla roots
-        // (`webpki-root-certs`), which works the same on every platform.
-        let cert_store = wreq::tls::CertStore::default();
-
-        let emulation_opts = wreq_util::EmulationOption::builder()
-            .emulation(wreq_util::Emulation::Chrome145)
-            .emulation_os(wreq_util::EmulationOS::Linux)
+        let emulation_opts = wreq_util::Emulation::builder()
+            .profile(wreq_util::Profile::Chrome145)
+            .platform(wreq_util::Platform::Linux)
             .build();
 
         let mut builder = wreq::Client::builder()
             .emulation(emulation_opts)
-            .cert_store(cert_store)
             .timeout(Duration::from_secs(30))
             .redirect(wreq::redirect::Policy::none());