使用windows.location.href时的跨站点脚本

Question

我正在使用Windows.location.href = URl从Java脚本导航到MVC控制器方法。 我想避免重定向时发生任何XSS攻击。 我该怎么办

Answer 1

您可以编写自己的XSS清理功能

function encodeHTML(s) {
    return s.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/"/g, '&quot;');
}

window.location.href = encodeHTML(URI);

Answer 2

应该很容易。 我已经为您准备了解决方案。 首先是一些理论上的理解

规则＃0-切勿在允许的位置插入非信任数据

<script>...NEVER PUT UNTRUSTED DATA HERE...</script>   directly in a script

<style>...NEVER PUT UNTRUSTED DATA HERE...</style>   directly in CSS

规则＃1-在将不受信任的数据插入HTML元素内容之前，先转义HTML和JavaScript

HTML ...在此处放置之前，ESCAPE解压缩了数据... JS

<script>alert('...ESCAPE UNTRUSTED DATA BEFORE PUTTING HERE...')</script>     inside a quoted string

转义为

& --> &
 < --> &lt;
 > --> &gt;
 " --> &quot;
 ' --> &#x27;     &apos; not recommended because its not in the HTML spec (See: section 24.4.1) &apos; is in the XML and XHTML specs.
 / --> &#x2F;     forward s

包含了睫毛，因为它有助于结束HTML实体

确保返回的Content-Type标头为application / json，而不是text / html。

来到编码部分

追踪将对您有帮助

private String killXSS(String value) {
        if (value != null) {
            // NOTE: It's highly recommended to use the ESAPI library and uncomment the following line to
            // avoid encoded attacks.
            // value = ESAPI.encoder().canonicalize(value);

            // Avoid null characters
            value = value.replaceAll("", "");

            // Avoid anything between script tags
            Pattern scriptPattern = Pattern.compile("<script>(.*?)</script>", Pattern.CASE_INSENSITIVE);
            value = scriptPattern.matcher(value).replaceAll("");

            // Avoid anything in a src='...' type of expression
            scriptPattern = Pattern.compile("src[\r\n]*=[\r\n]*\\\'(.*?)\\\'", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");

            scriptPattern = Pattern.compile("src[\r\n]*=[\r\n]*\\\"(.*?)\\\"", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");

            // Remove any lonesome </script> tag
            scriptPattern = Pattern.compile("</script>", Pattern.CASE_INSENSITIVE);
            value = scriptPattern.matcher(value).replaceAll("");

            // Remove any lonesome <script ...> tag
            scriptPattern = Pattern.compile("<script(.*?)>", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");

            // Avoid eval(...) expressions
            scriptPattern = Pattern.compile("eval\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");

            // Avoid expression(...) expressions
            scriptPattern = Pattern.compile("expression\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");

            // Avoid javascript:... expressions
            scriptPattern = Pattern.compile("javascript:", Pattern.CASE_INSENSITIVE);
            value = scriptPattern.matcher(value).replaceAll("");

            // Avoid vbscript:... expressions
            scriptPattern = Pattern.compile("vbscript:", Pattern.CASE_INSENSITIVE);
            value = scriptPattern.matcher(value).replaceAll("");

            // Avoid onload= expressions
            scriptPattern = Pattern.compile("onload(.*?)=", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");
        }
        return value;
    }

确保发送到服务器的每个请求都被上述代码剥离，并且您永远不会成为XSS的受害者。