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| 1 | +// Copyright (c) Microsoft Corporation |
| 2 | +// The Microsoft Corporation licenses this file to you under the MIT license. |
| 3 | +// See the LICENSE file in the project root for more information. |
| 4 | +using System; |
| 5 | +using System.Diagnostics; |
| 6 | +using System.Globalization; |
| 7 | +using System.Resources; |
| 8 | +using Microsoft.VisualStudio.TestTools.UnitTesting; |
| 9 | +using Microsoft.Win32; |
| 10 | +using RegistryPreviewUILib; |
| 11 | + |
| 12 | +namespace RegistryPreview.FuzzTests |
| 13 | +{ |
| 14 | + public class FuzzTests |
| 15 | + { |
| 16 | + private const string REGISTRYHEADER4 = "regedit4"; |
| 17 | + private const string REGISTRYHEADER5 = "windows registry editor version 5.00"; |
| 18 | + private const string KEYIMAGE = "ms-appx:///Assets/RegistryPreview/folder32.png"; |
| 19 | + private const string DELETEDKEYIMAGE = "ms-appx:///Assets/RegistryPreview/deleted-folder32.png"; |
| 20 | + |
| 21 | + // Case 1: Fuzz test for CheckKeyLineForBrackets |
| 22 | + public static void FuzzCheckKeyLineForBrackets(ReadOnlySpan<byte> input) |
| 23 | + { |
| 24 | + string registryLine; |
| 25 | + |
| 26 | + // Simulate registry file content as registryContent |
| 27 | + var registryContent = GenerateRegistryHeader(input); |
| 28 | + |
| 29 | + string[] registryLines = registryContent.Split("\r"); |
| 30 | + |
| 31 | + if (registryLines.Length <= 1) |
| 32 | + { |
| 33 | + return; |
| 34 | + } |
| 35 | + |
| 36 | + // REG files have to start with one of two headers and it's case-insensitive |
| 37 | + // The header in the registry file is either REGISTRYHEADER4 or REGISTRYHEADER5 |
| 38 | + registryLine = registryLines[0]; |
| 39 | + |
| 40 | + // Check if the registry header is valid |
| 41 | + if (!IsValidRegistryHeader(registryLine)) |
| 42 | + { |
| 43 | + return; |
| 44 | + } |
| 45 | + |
| 46 | + int index = 1; |
| 47 | + registryLine = registryLines[index]; // Extract content after the header |
| 48 | + |
| 49 | + ParseHelper.ProcessRegistryLine(registryLine); |
| 50 | + if (registryLine.StartsWith("[-", StringComparison.InvariantCulture)) |
| 51 | + { |
| 52 | + // remove the - as we won't need it but it will get special treatment in the UI |
| 53 | + registryLine = registryLine.Remove(1, 1); |
| 54 | + |
| 55 | + string imageName = DELETEDKEYIMAGE; |
| 56 | + |
| 57 | + // Fuzz test for the CheckKeyLineForBrackets method |
| 58 | + ParseHelper.CheckKeyLineForBrackets(ref registryLine, ref imageName); |
| 59 | + } |
| 60 | + else if (registryLine.StartsWith('[')) |
| 61 | + { |
| 62 | + string imageName = KEYIMAGE; |
| 63 | + |
| 64 | + // Fuzz test for the CheckKeyLineForBrackets method |
| 65 | + ParseHelper.CheckKeyLineForBrackets(ref registryLine, ref imageName); |
| 66 | + } |
| 67 | + else |
| 68 | + { |
| 69 | + return; |
| 70 | + } |
| 71 | + } |
| 72 | + |
| 73 | + // Case 2: Fuzz test for StripFirstAndLast |
| 74 | + public static void FuzzStripFirstAndLast(ReadOnlySpan<byte> input) |
| 75 | + { |
| 76 | + string registryLine; |
| 77 | + |
| 78 | + var registryContent = GenerateRegistryHeader(input); |
| 79 | + |
| 80 | + registryContent = registryContent.Replace("\r\n", "\r"); |
| 81 | + string[] registryLines = registryContent.Split("\r"); |
| 82 | + |
| 83 | + if (registryLines.Length <= 1) |
| 84 | + { |
| 85 | + return; |
| 86 | + } |
| 87 | + |
| 88 | + // REG files have to start with one of two headers and it's case-insensitive |
| 89 | + registryLine = registryLines[0]; |
| 90 | + |
| 91 | + if (!IsValidRegistryHeader(registryLine)) |
| 92 | + { |
| 93 | + return; |
| 94 | + } |
| 95 | + |
| 96 | + int index = 1; |
| 97 | + registryLine = registryLines[index]; |
| 98 | + |
| 99 | + ParseHelper.ProcessRegistryLine(registryLine); |
| 100 | + |
| 101 | + if (registryLine.StartsWith("[-", StringComparison.InvariantCulture)) |
| 102 | + { |
| 103 | + // remove the - as we won't need it but it will get special treatment in the UI |
| 104 | + registryLine = registryLine.Remove(1, 1); |
| 105 | + |
| 106 | + string imageName = DELETEDKEYIMAGE; |
| 107 | + ParseHelper.CheckKeyLineForBrackets(ref registryLine, ref imageName); |
| 108 | + |
| 109 | + // Fuzz test for the StripFirstAndLast method |
| 110 | + registryLine = ParseHelper.StripFirstAndLast(registryLine); |
| 111 | + } |
| 112 | + else if (registryLine.StartsWith('[')) |
| 113 | + { |
| 114 | + string imageName = KEYIMAGE; |
| 115 | + ParseHelper.CheckKeyLineForBrackets(ref registryLine, ref imageName); |
| 116 | + |
| 117 | + // Fuzz test for the StripFirstAndLast method |
| 118 | + registryLine = ParseHelper.StripFirstAndLast(registryLine); |
| 119 | + } |
| 120 | + else if (registryLine.StartsWith('"') && registryLine.EndsWith("=-", StringComparison.InvariantCulture)) |
| 121 | + { |
| 122 | + // remove "=-" |
| 123 | + registryLine = registryLine[..^2]; |
| 124 | + |
| 125 | + // remove the "'s without removing all of them |
| 126 | + // Fuzz test for the StripFirstAndLast method |
| 127 | + registryLine = ParseHelper.StripFirstAndLast(registryLine); |
| 128 | + } |
| 129 | + else if (registryLine.StartsWith('"')) |
| 130 | + { |
| 131 | + int equal = registryLine.IndexOf('='); |
| 132 | + if ((equal < 0) || (equal > registryLine.Length - 1)) |
| 133 | + { |
| 134 | + // something is very wrong |
| 135 | + return; |
| 136 | + } |
| 137 | + |
| 138 | + // set the name and the value |
| 139 | + string name = registryLine.Substring(0, equal); |
| 140 | + |
| 141 | + // trim the whitespace and quotes from the name |
| 142 | + name = name.Trim(); |
| 143 | + |
| 144 | + // Fuzz test for the StripFirstAndLast method |
| 145 | + name = ParseHelper.StripFirstAndLast(name); |
| 146 | + |
| 147 | + // Clean out any escaped characters in the value, only for the preview |
| 148 | + name = ParseHelper.StripEscapedCharacters(name); |
| 149 | + |
| 150 | + // set the value |
| 151 | + string value = registryLine.Substring(equal + 1); |
| 152 | + |
| 153 | + // trim the whitespace from the value |
| 154 | + value = value.Trim(); |
| 155 | + |
| 156 | + // if the first character is a " then this is a string value, so find the last most " which will avoid comments |
| 157 | + if (value.StartsWith('"')) |
| 158 | + { |
| 159 | + int last = value.LastIndexOf('"'); |
| 160 | + if (last >= 0) |
| 161 | + { |
| 162 | + value = value.Substring(0, last + 1); |
| 163 | + } |
| 164 | + } |
| 165 | + |
| 166 | + if (value.StartsWith('"') && value.EndsWith('"')) |
| 167 | + { |
| 168 | + value = ParseHelper.StripFirstAndLast(value); |
| 169 | + } |
| 170 | + } |
| 171 | + else |
| 172 | + { |
| 173 | + return; |
| 174 | + } |
| 175 | + } |
| 176 | + |
| 177 | + public static string GenerateRegistryHeader(ReadOnlySpan<byte> input) |
| 178 | + { |
| 179 | + string header = new Random().Next(2) == 0 ? REGISTRYHEADER4 : REGISTRYHEADER5; |
| 180 | + |
| 181 | + string inputText = System.Text.Encoding.UTF8.GetString(input); |
| 182 | + string registryContent = header + "\r" + inputText; |
| 183 | + |
| 184 | + return registryContent; |
| 185 | + } |
| 186 | + |
| 187 | + private static bool IsValidRegistryHeader(string line) |
| 188 | + { |
| 189 | + // Convert the line to lowercase once for comparison |
| 190 | + switch (line) |
| 191 | + { |
| 192 | + case REGISTRYHEADER4: |
| 193 | + case REGISTRYHEADER5: |
| 194 | + return true; |
| 195 | + default: |
| 196 | + return false; |
| 197 | + } |
| 198 | + } |
| 199 | + } |
| 200 | +} |
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