Winform下动态执行JavaScript脚本获取运行结果，谈谈网站的自动登录及资料获取操作
为了有效阻止恶意用户的攻击，一般登录都会采用验证码方式方式处理登录，类似QQ的很多产品的验证码处理，但在一些OA系统中，系统通过非对称加密方式来处理登录的密码信息，登录页面每次提供对密码进行加密的公钥是不同的，因此如果要模拟登录，就需要先获取公钥，然后根据公钥把输入的密码加密，然后通过POST提交给服务器进行验证登录。由于公钥是页面刷新变化的，而加密是通过Javascript脚本进行加密，如下面的登录页面源码所示。
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<link rel="stylesheet" type="text/css" href="/templates/2008/index.css">
<link rel="shortcut icon" href="/images/tongda.ico">
<script src="/inc/js/rsa/jsbn.js"></script><script src="/inc/js/rsa/prng4.js"></script><script src="/inc/js/rsa/rng.js"></script><script src="/inc/js/rsa/rsa.js"></script>
<script type="text/javascript">
function CheckForm()
{
var rsa = new RSAKey();
rsa.setPublic("97e256ec6147b7aadc46a353b5c5d707a895b402d114290c0c24a28919507569", "10001");
try{
document.form1.PASSWORD.value = rsa.encrypt(document.form1.PASSWORD.value);
}
catch(ex){
return false;
}
return true;
}
</script>
</head>
<body onload="javascript:document.form1.PASSWORD.focus();">
<br>
<br>
<br>
<br>
<div align="center">
<form name="form1" method="post" action="logincheck.php" autocomplete="off" onsubmit="return CheckForm();">
<table cellspacing="0" cellpadding="0" align="center">
<tr class="img_field">
<td align="center"><img src="/attachment/2090997160/index_1.jpg" width="651" height="241"></td>
</tr>
<tr height="37" class="login_field">
<td align="center">
<b>用户名</b> <input type="text" class="text" name="UNAME" size="15" onmouseover="this.focus()" onfocus="this.select()" value="">
<b>密码</b> <input type="password" class="text" name="PASSWORD" onmouseover="this.focus()" onfocus="this.select()" size="15" value="">
<select name="UI">
<option value="0">标准界面</option></select>
<input type="submit" name="submit" class="submit" value="登 录">
</td>
</tr>
</table>
<br>
</form>
<link rel="stylesheet" type="text/css" href="/templates/2008/index.css">
<link rel="shortcut icon" href="/images/tongda.ico">
<script src="/inc/js/rsa/jsbn.js"></script><script src="/inc/js/rsa/prng4.js"></script><script src="/inc/js/rsa/rng.js"></script><script src="/inc/js/rsa/rsa.js"></script>
<script type="text/javascript">
function CheckForm()
{
var rsa = new RSAKey();
rsa.setPublic("97e256ec6147b7aadc46a353b5c5d707a895b402d114290c0c24a28919507569", "10001");
try{
document.form1.PASSWORD.value = rsa.encrypt(document.form1.PASSWORD.value);
}
catch(ex){
return false;
}
return true;
}
</script>
</head>
<body onload="javascript:document.form1.PASSWORD.focus();">
<br>
<br>
<br>
<br>
<div align="center">
<form name="form1" method="post" action="logincheck.php" autocomplete="off" onsubmit="return CheckForm();">
<table cellspacing="0" cellpadding="0" align="center">
<tr class="img_field">
<td align="center"><img src="/attachment/2090997160/index_1.jpg" width="651" height="241"></td>
</tr>
<tr height="37" class="login_field">
<td align="center">
<b>用户名</b> <input type="text" class="text" name="UNAME" size="15" onmouseover="this.focus()" onfocus="this.select()" value="">
<b>密码</b> <input type="password" class="text" name="PASSWORD" onmouseover="this.focus()" onfocus="this.select()" size="15" value="">
<select name="UI">
<option value="0">标准界面</option></select>
<input type="submit" name="submit" class="submit" value="登 录">
</td>
</tr>
</table>
<br>
</form>
为了模拟登录，我们需要先获取页面的公钥信息，然后通过在C#中运行Javascript脚本，传递公钥和明文密码，然后获取脚本加密的结果，再提交给服务器处理。
如下面代码所示，获取公钥就是分析HTML源码，通过正则表达式匹配即可获取到，相对比较简单，但是要获取Javascript脚本的运行结果，就需要花点功夫了。
///inc/js/rsa/jsbn.js /inc/js/rsa/prng4.js /inc/js/rsa/rng.js /inc/js/rsa/rsa.js
string scriptUrl = "http://www.abc.cn:8080/inc/js/rsa/jsbn.js";
string scriptUrl2 = "http://www.abc.cn:8080/inc/js/rsa/prng4.js";
string scriptUrl3 = "http://www.abc.cn:8080/inc/js/rsa/rng.js";
string scriptUrl4 = "http://www.abc.cn:8080/inc/js/rsa/rsa.js";
string referen = "http://www.abc.cn:8080";
HttpHelper helper = new HttpHelper();
helper.Encoding = Encoding.Default;
string mainContent = helper.GetHtml(referen, cookie, referen);
string regex = "rsa.setPublic\\(\"(?<publicKey>.*?)\",\\s*\"(?<encrypt>.*?)\"\\);";
Regex re = new Regex(regex, RegexOptions.IgnoreCase | RegexOptions.Singleline | RegexOptions.IgnorePatternWhitespace);
Match mc = re.Match(mainContent);
if (mc.Success)
{
string publicKey = mc.Groups["publicKey"].Value;
string encrypt = mc.Groups["encrypt"].Value;
string pass = config.AppConfigGet("ContactPassword");
string source = "";//"var appName = \"Microsoft Internet Explorer\"; " + Environment.NewLine;
source += helper.GetHtml(scriptUrl);
source += helper.GetHtml(scriptUrl2);
source += helper.GetHtml(scriptUrl3);
source += helper.GetHtml(scriptUrl4);
//source = source.Replace("navigator.", "");
source = getJS(source);
encryptPass = scriptEngine.Eval("getRSAKey()",
source +
"\r\nfunction getRSAKey(){\r\nvar RSA = new RSAKey();\r\nRSA.setPublic(\"" +
publicKey + "\",\"" + encrypt + "\");\r\nvar Res = RSA.encrypt('" + pass + "');\r\nreturn Res;\r\n}").ToString();
}
#endregion
string scriptUrl = "http://www.abc.cn:8080/inc/js/rsa/jsbn.js";
string scriptUrl2 = "http://www.abc.cn:8080/inc/js/rsa/prng4.js";
string scriptUrl3 = "http://www.abc.cn:8080/inc/js/rsa/rng.js";
string scriptUrl4 = "http://www.abc.cn:8080/inc/js/rsa/rsa.js";
string referen = "http://www.abc.cn:8080";
HttpHelper helper = new HttpHelper();
helper.Encoding = Encoding.Default;
string mainContent = helper.GetHtml(referen, cookie, referen);
string regex = "rsa.setPublic\\(\"(?<publicKey>.*?)\",\\s*\"(?<encrypt>.*?)\"\\);";
Regex re = new Regex(regex, RegexOptions.IgnoreCase | RegexOptions.Singleline | RegexOptions.IgnorePatternWhitespace);
Match mc = re.Match(mainContent);
if (mc.Success)
{
string publicKey = mc.Groups["publicKey"].Value;
string encrypt = mc.Groups["encrypt"].Value;
string pass = config.AppConfigGet("ContactPassword");
string source = "";//"var appName = \"Microsoft Internet Explorer\"; " + Environment.NewLine;
source += helper.GetHtml(scriptUrl);
source += helper.GetHtml(scriptUrl2);
source += helper.GetHtml(scriptUrl3);
source += helper.GetHtml(scriptUrl4);
//source = source.Replace("navigator.", "");
source = getJS(source);
encryptPass = scriptEngine.Eval("getRSAKey()",
source +
"\r\nfunction getRSAKey(){\r\nvar RSA = new RSAKey();\r\nRSA.setPublic(\"" +
publicKey + "\",\"" + encrypt + "\");\r\nvar Res = RSA.encrypt('" + pass + "');\r\nreturn Res;\r\n}").ToString();
}
#endregion
上面的运行Javascript脚本，需要先把用到的脚本全部下载，把内容组合起来，然后添加一个虚拟的函数，运行得到返回结果接口，虚拟的函数一定要写正确，否则出来很多错误，得不到结果。
上面的代码有source = getJS(source);这一句，是为了避免脚本调用navigator.appName来处理浏览器类型和版本的判断，有两种方式可以跳过这个处理，一个增加一个appName的变量，如var appName =**这样，然后统一替换navigator. 的字符，使得脚本判别浏览器代码失效；二是通过正则表达式替换掉响应的判断代码即可
private string getJS(string strJS)
{
if (!Regex.IsMatch(strJS, @"if\(j_lm \&\& \(navigator.appName == ""Microsoft Internet Explorer""\)\) {.+?dbits = 28;.+?}", RegexOptions.Singleline) ||
!Regex.IsMatch(strJS, @"if\(navigator.appName == ""Netscape"" && navigator.appVersion < ""5"" && window.crypto\) {.+?}", RegexOptions.Singleline))
{
return string.Empty;
}
strJS = Regex.Replace(strJS,
@"if\(j_lm \&\& \(navigator.appName == ""Microsoft Internet Explorer""\)\) {.+?dbits = 28;.+?}",
"BigInteger.prototype.am = am2;\r\ndbits = 30\r\n", RegexOptions.Singleline);
strJS = Regex.Replace(strJS,
@"if\(navigator.appName == ""Netscape"" && navigator.appVersion < ""5"" && window.crypto\) {.+?}",
string.Empty, RegexOptions.Singleline);
return strJS;
}
if (!Regex.IsMatch(strJS, @"if\(j_lm \&\& \(navigator.appName == ""Microsoft Internet Explorer""\)\) {.+?dbits = 28;.+?}", RegexOptions.Singleline) ||
!Regex.IsMatch(strJS, @"if\(navigator.appName == ""Netscape"" && navigator.appVersion < ""5"" && window.crypto\) {.+?}", RegexOptions.Singleline))
{
return string.Empty;
}
strJS = Regex.Replace(strJS,
@"if\(j_lm \&\& \(navigator.appName == ""Microsoft Internet Explorer""\)\) {.+?dbits = 28;.+?}",
"BigInteger.prototype.am = am2;\r\ndbits = 30\r\n", RegexOptions.Singleline);
strJS = Regex.Replace(strJS,
@"if\(navigator.appName == ""Netscape"" && navigator.appVersion < ""5"" && window.crypto\) {.+?}",
string.Empty, RegexOptions.Singleline);
return strJS;
}
得到处理过的密码密文 ，一般通过POST方式提交登录页面，即可完成系统的登录了，然后继续可以通过HttpRequest方式获取系统各种页面的信息了（如联系人等），如下面所示。
string referen = "http://www.abc.cn:8080/";
string loginUrl = "http://www.abc.cn:8080/logincheck.php";
string login = "test";
string loginPostData = string.Format("UNAME={1}&PASSWORD={0}&UI=0&submit={2}", encryptPass, login, "%B5%C7+%C2%BC");
string conctactUrl = "http://www.abc.cn:8080/general/ipanel/user/search.php";
string itemRegex = "<tr\\s*class=\"TableLine\\d\">\\s*(.*?)\\s*</tr>";
string memberRegex = "<td.*?>\\s*(.*?)\\s*</td>";
List<ContactInfo> contactList = new List<ContactInfo>();
HttpHelper helper = new HttpHelper();
helper.Encoding = Encoding.Default;
string result = helper.GetHtml(loginUrl, cookie, loginPostData, true, "", loginUrl);
string login = "test";
string loginPostData = string.Format("UNAME={1}&PASSWORD={0}&UI=0&submit={2}", encryptPass, login, "%B5%C7+%C2%BC");
string conctactUrl = "http://www.abc.cn:8080/general/ipanel/user/search.php";
string itemRegex = "<tr\\s*class=\"TableLine\\d\">\\s*(.*?)\\s*</tr>";
string memberRegex = "<td.*?>\\s*(.*?)\\s*</td>";
List<ContactInfo> contactList = new List<ContactInfo>();
HttpHelper helper = new HttpHelper();
helper.Encoding = Encoding.Default;
string result = helper.GetHtml(loginUrl, cookie, loginPostData, true, "", loginUrl);
最后程序处理登录后，自动获取联系人的界面效果如下所示：
除了上面的操作方式，还有一种途径是通过WebBrowser控件实现数据的自动提交，WebBrowser控件处理脚本的运行更加方便，但缺点是这个控件相对较慢，首先我介绍一下这种方式，在按钮触发中调用控件的Navigate函数，打开相应的登录链接地址。
webBrowser1.Navigate("http://www.abc.cn:8080");
接着在浏览器控件的页面完成函数处理中对数据进行处理，处理的思路就是调用脚本对输入的内容进行加密，然后再触发提交按钮即可完成页面的登录，记录登录的信息，然后再去获取相关的页面内容信息，不过这种控件处理相对没那么大的弹性处理，不过可以作为一些功能的补充使用。
private int numtries = 0;
private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
if (webBrowser1.Document.GetElementById("UNAME") != null)
{
webBrowser1.Document.GetElementById("UNAME").SetAttribute("value", "陈建才");
webBrowser1.Document.GetElementById("PASSWORD").SetAttribute("value", "voowoo770916");
if (numtries < 2)
{
IHTMLWindow2 login = (mshtml.IHTMLWindow2)webBrowser1.Document.Window.DomWindow;
//login.execScript("document.forms[0].submit();", "javascript");
login.execScript("CheckForm();", "javascript");
string value = webBrowser1.Document.GetElementById("PASSWORD").GetAttribute("value");
encryptPass = value;
GetContact();
numtries++;
}
}
if (webBrowser1.Document.GetElementById("userName") == null)
{
numtries = 0;
//string cookieString = webBrowser1.Document.Cookie;
//CookieCollection cc = new CookieCollection();
//CookieManger.SetCKAppendToCC(cc, cookieString, "http://www.abc.cn:8080");
//cookie.Add(cc);
}
}
private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
if (webBrowser1.Document.GetElementById("UNAME") != null)
{
webBrowser1.Document.GetElementById("UNAME").SetAttribute("value", "陈建才");
webBrowser1.Document.GetElementById("PASSWORD").SetAttribute("value", "voowoo770916");
if (numtries < 2)
{
IHTMLWindow2 login = (mshtml.IHTMLWindow2)webBrowser1.Document.Window.DomWindow;
//login.execScript("document.forms[0].submit();", "javascript");
login.execScript("CheckForm();", "javascript");
string value = webBrowser1.Document.GetElementById("PASSWORD").GetAttribute("value");
encryptPass = value;
GetContact();
numtries++;
}
}
if (webBrowser1.Document.GetElementById("userName") == null)
{
numtries = 0;
//string cookieString = webBrowser1.Document.Cookie;
//CookieCollection cc = new CookieCollection();
//CookieManger.SetCKAppendToCC(cc, cookieString, "http://www.abc.cn:8080");
//cookie.Add(cc);
}
}
通过浏览器接口，我们可以实现页面内容在不可以见的浏览器控件中呈现，然后获取相应的页面对象或者页面源码进行分析，可以得到更加丰富的数据，模拟浏览器的实际操作和获得真实的显示结果。
专注于代码生成工具、.Net/.NetCore 框架架构及软件开发，以及各种Vue.js的前端技术应用。著有Winform开发框架/混合式开发框架、微信开发框架、Bootstrap开发框架、ABP开发框架、SqlSugar开发框架等框架产品。
转载请注明出处：撰写人：伍华聪 http://www.iqidi.com
