Create ObjC_Unppining_Helper.js

ObjC_Unppining_Helper.js

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+/*
+=========================
+  ObjC Unppining Helper
+ 		By Lotem
+=========================
+
+This is a frida script for unpinning and reversing of ObjC applications.
+It is used to list and intercept methods in moudles by regexs.
+
+You may change the following regex arrays to match your needs:
+*/
+
+// The list of regexs for the moudle name
+var moduleKeyWords = [/.*/]; // (It is not recommended to search all the moudles)
+
+// The list of regexs for the method name
+var methodKeyWords = [/cert/i, /trust/i, /ssl/i, /verify/i, /509/]; 
+
+// The list of regexs for the method to override their return value with "1"
+var overrideKeyWords = [];
+
+/*
+To run this script with frida on iPhone, follow these steps:
+	1. Make sure the iPhone is jailbreaked
+	2. Download the frida server from Cydia (package: re.frida.server)
+	3. Connect the iPhone to your computer with USB and open the application 
+	4. Type in console "frida-ps -U" to get the list of running proccess on the iPhone, and find the proccess name of your app
+	5. Type in console "frida -U <APP PROCCESS NAME> -l <PATH TO THIS SCRIPT>" to run this script
+	6. Now you should use the app to trigger some of the intercepted methods
+*/
+
+// The "main" method. Going over all the moudles and all the methods, and trying to intercept each one which matches the regexs.
+setImmediate(function () {
+	if (!ObjC.available) {
+		console.log("[-] Objective-C Runtime is not available!");
+		return;
+	}
+
+	console.log("=======================================================\n");
+	console.log("[*] Searching methods...");
+
+	var moduleUsed = false;
+
+	Process.enumerateModules({
+		onMatch: function(module) {
+
+			if (!matchesRegex(moduleKeyWords, module.name)) {
+				return;
+			}
+
+			moduleUsed = false;
+			Module.enumerateSymbols(module.name, {
+				onMatch: function(exp) {
+					if (matchesRegex(methodKeyWords, exp.name)) {
+						if (!moduleUsed) {
+							console.log("[*] In module \"" + module.name + "\"");
+							moduleUsed = true;
+						}
+						console.log("\t[*] Matching method: \"" + exp.name + "\", Address: " + Module.findExportByName(module.name, exp.name));
+
+						if (intercept(module.name, exp.name)) {
+							console.log("\t\t[+] Now intercepting " + exp.name);
+						} else {
+	    					console.log("\t\t[-] Could not intercept " + exp.name);
+						}
+					}
+				},
+				onComplete: function (retval) {}
+			});
+		},
+		onComplete: function (retval) {}
+	});
+
+
+	console.log("[*] Completed!");
+	console.log("=======================================================\n\n");
+});
+
+// Return if 'str' match any of the regexs in the array 'regexList'
+function matchesRegex(regexList, str) {
+	for (var i = 0; i < regexList.length; i++) {
+		if (str.search(regexList[i]) != -1) {
+			return true;
+		}
+	}
+
+	return false;
+}
+
+// Try to intercept a method by moudle name and function name.
+// Return 'true' on success and 'false' on failor.
+function intercept(module, func) {
+	try {
+	    Interceptor.attach(Module.findExportByName(module, func), {
+	      	onEnter: function(args) {
+	      		console.log("[*] Method CALL:\t\"" + func + "\" called!");
+            },  
+	        onLeave: function (retval) {
+	            console.log("[*] Method RETURN:\t\"" + func + "\" (return value: " + retval + ")");
+
+	            if (matchesRegex(overrideKeyWords, func)) {
+	            	console.log("[!] CHANGED RETURN VALUE of method:\t\"" + func + "\" (new value: " + 1 + ")");
+	            	retval.replace(1);
+	            }
+	      	}
+	    });
+
+	    return true;
+	} catch(err) {
+		return false;
+	}
+}