知识笔记 - 记录JS逆向中常用的Hook方法1. hook cookie2. hook eval3. hook 字符串方法4. hook debugger5. hook ajax

1. hook cookie

(function() {
	console.log('enter cookiehook')
    var cookieTemp = '';
    Object.defineProperty(document, 'cookie', {
        set: function(val) {
			console.log('捕获到cookie设置->', val);
			if (val.indexOf('target') != -1) {
				debugger;
				}
            cookieTemp = val;
            return val;
        },
        get: function() {
			console.log(document.cookie)
            return document.cookie;
        },
    });
})()

2. hook eval

(function() { 
	var _eval = window.eval;
	window.eval = function(x){
		debugger;
	    _eval(x);
	};
	//防检测
	window.eval.toString = _eval.toString;
})();

3. hook 字符串方法

//split方法
String.prototype._split=String.prototype.split;
String.prototype.split = function(val){
	debugger;
	return this.toString()._spilt(val)
}
//伪装原型链
String.prototype.split.toString=function(){
	return 'function split() { [native code] }'
}

4. hook debugger

//方式1
Function.prototype.constructor=function(){};
Function.prototype.constructor_bc=Function.prototype.constructor;
Function.prototype.constructor=function(){
    if (arguments==="debugger"){return}
    else{return Function.prototype.constructor_bc.apply(this,arguments)}
};
//方式2
_eval = eval
eval = function () {
    if (argument.indexOf("debugger") === 0) {
        return
    }
    return _eval.apply(argument)
}
//方式3
_eval = eval
eval = function () {
    reg = RegExp(/debugger/)
    if (reg.exec(argument)) {
        return
    }
    return _eval.apply(argument)
}
//方式4
_Function = Function
Function = function () {
    if (argument.indexOf("debugger") === 0) {
        return
    }
    return _Function.apply(argument)
}
//方式5
_Function = Function
Function = function () {
    reg = RegExp(/debugger/)
    if (reg.exec(argument)) {
        return
    }
    return _Function.apply(argument)
}

5. hook ajax

!function (t) {
    function n(e) {
        if (r[e]) return r[e].exports;
        var i = r[e] = {
            exports: {},
            id: e,
            loaded: !1
        };
        return t[e].call(i.exports, i, i.exports, n),
            i.loaded = !0,
            i.exports
    }

    var r = {};
    return n.m = t,
        n.c = r,
        n.p = "",
        n(0)
}([function (t, n, r) {
    r(1)(window)
},
    function (t, n) {
        t.exports = function (t) {
            var n = "RealXMLHttpRequest";
            t.hookAjax = function (t) {
                function r(n) {
                    return function () {
                        var r = this.hasOwnProperty(n + "_") ? this[n + "_"] : this.xhr[n],
                            e = (t[n] || {}).getter;
                        return e && e(r, this) || r
                    }
                }

                function e(n) {
                    return function (r) {
                        var e = this.xhr,
                            i = this,
                            o = t[n];
                        if ("function" == typeof o) e[n] = function () {
                            t[n](i) || r.apply(e, arguments)
                        };
                        else {
                            var u = (o || {}).setter;
                            r = u && u(r, i) || r;
                            try {
                                e[n] = r
                            } catch (t) {
                                this[n + "_"] = r
                            }
                        }
                    }
                }

                function i(n) {
                    return function () {
                        var r = [].slice.call(arguments);
                        if (!t[n] || !t[n].call(this, r, this.xhr)) return this.xhr[n].apply(this.xhr, r)
                    }
                }

                return window[n] = window[n] || XMLHttpRequest,
                    XMLHttpRequest = function () {
                        var t = new window[n];
                        for (var o in t) {
                            var u = "";
                            try {
                                u = typeof t[o]
                            } catch (t) {
                            }
                            "function" === u ? this[o] = i(o) : Object.defineProperty(this, o, {
                                get: r(o),
                                set: e(o),
                                enumerable: !0
                            })
                        }
                        this.xhr = t
                    },
                    window[n]
            },
                t.unHookAjax = function () {
                    window[n] && (XMLHttpRequest = window[n]),
                        window[n] = void 0
                },
                t.default = t
        }
    }]);
hookAjax(
    // hook functions and callbacks of XMLHttpRequest object
    {
        onreadystatechange: function (xhr) {
            //console.log("onreadystatechange called: %O", xhr)

        },
        onload: function (xhr) {
            //console.log("onload called: %O", xhr)
            xhr.responseText = "hook" + xhr.responseText;

        },
        open: function (arg, xhr) {
            console.log("open called: method:%s,url:%s,async:%s", arg[0], arg[1], arg[2], xhr);
            // arg[1] += "?hook_tag=1";
            //统一添加请求头
        },
        send: function (arg, xhr) {
            console.log("send called: %O", arg[0]);
            xhr.setRequestHeader("_custom_header_", "ajaxhook")
        },
        setRequestHeader: function (arg, xhr) {
            console.log("setRequestHeader called!", arg)
        },
        // hook attributes of XMLHttpRequest object
        timeout: {
            setter: function (v, xhr) {
                //timeout shouldn't exceed 10s
                return Math.max(v, 1000);
            }
        }
    }
);

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