633 lines
24 KiB
C#
633 lines
24 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="UrlPath.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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/*
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* UrlPath class
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*
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* Copyright (c) 1999 Microsoft Corporation
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*/
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namespace System.Web.Util {
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using System.Security.Permissions;
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using System.Text;
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using System.Runtime.Serialization.Formatters;
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using System.Runtime.InteropServices;
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using System.Collections;
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using System.Globalization;
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using System.IO;
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using System.Web.Hosting;
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internal struct FileTimeInfo {
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internal long LastWriteTime;
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internal long Size;
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internal static readonly FileTimeInfo MinValue = new FileTimeInfo(0, 0);
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internal FileTimeInfo(long lastWriteTime, long size) {
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LastWriteTime = lastWriteTime;
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Size = size;
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}
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public override bool Equals(object obj) {
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FileTimeInfo fti;
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if (obj is FileTimeInfo) {
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fti = (FileTimeInfo) obj;
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return (LastWriteTime == fti.LastWriteTime) && (Size == fti.Size);
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}
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else {
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return false;
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}
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}
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public static bool operator == (FileTimeInfo value1, FileTimeInfo value2)
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{
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return (value1.LastWriteTime == value2.LastWriteTime) &&
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(value1.Size == value2.Size);
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}
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public unsafe static bool operator != (FileTimeInfo value1, FileTimeInfo value2)
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{
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return !(value1 == value2);
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}
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public override int GetHashCode(){
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return HashCodeCombiner.CombineHashCodes(LastWriteTime.GetHashCode(), Size.GetHashCode());
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}
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}
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/*
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* Helper methods relating to file operations
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*/
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internal class FileUtil {
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private FileUtil() {
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}
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[FileIOPermission(SecurityAction.Assert, AllFiles = FileIOPermissionAccess.Read)]
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internal static bool FileExists(String filename) {
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bool exists = false;
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try {
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exists = File.Exists(filename);
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}
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catch {
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}
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return exists;
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}
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// For a given path, if its beneath the app root, return the first existing directory
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internal static string GetFirstExistingDirectory(string appRoot, string fileName) {
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if (IsBeneathAppRoot(appRoot, fileName)) {
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string existingDir = appRoot;
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do {
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int nextSeparator = fileName.IndexOf(Path.DirectorySeparatorChar, existingDir.Length + 1);
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if (nextSeparator > -1) {
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string nextDir = fileName.Substring(0, nextSeparator);
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if (FileUtil.DirectoryExists(nextDir, false)) {
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existingDir = nextDir;
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continue;
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}
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}
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break;
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} while (true);
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return existingDir;
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}
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return null;
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}
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internal static bool IsBeneathAppRoot(string appRoot, string filePath) {
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if (filePath.Length > appRoot.Length + 1
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&& filePath.IndexOf(appRoot, StringComparison.OrdinalIgnoreCase) > -1
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&& filePath[appRoot.Length] == Path.DirectorySeparatorChar) {
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return true;
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}
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return false;
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}
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// Remove the final backslash from a directory path, unless it's something like c:\
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internal static String RemoveTrailingDirectoryBackSlash(String path) {
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if (path == null)
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return null;
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int length = path.Length;
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if (length > 3 && path[length - 1] == '\\')
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path = path.Substring(0, length - 1);
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return path;
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}
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private static int _maxPathLength = 259;
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// If the path is longer than the maximum length
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// Trim the end and append the hashcode to it.
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internal static String TruncatePathIfNeeded(string path, int reservedLength) {
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int maxPathLength = _maxPathLength - reservedLength;
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if (path.Length > maxPathLength) {
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//
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path = path.Substring(0, maxPathLength - 13) +
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path.GetHashCode().ToString(CultureInfo.InvariantCulture);
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}
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return path;
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}
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/*
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* Canonicalize the directory, and makes sure it ends with a '\'
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*/
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internal static string FixUpPhysicalDirectory(string dir) {
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if (dir == null)
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return null;
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dir = Path.GetFullPath(dir);
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// Append '\' to the directory if necessary.
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if (!StringUtil.StringEndsWith(dir, @"\"))
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dir = dir + @"\";
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return dir;
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}
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// Fail if the physical path is not canonical
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static internal void CheckSuspiciousPhysicalPath(string physicalPath) {
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if (IsSuspiciousPhysicalPath(physicalPath)) {
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throw new HttpException(404, String.Empty);
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}
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}
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// Check whether the physical path is not canonical
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// NOTE: this API throws if we don't have permission to the file.
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// NOTE: The compare needs to be case insensitive (VSWhidbey 444513)
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static internal bool IsSuspiciousPhysicalPath(string physicalPath) {
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bool pathTooLong;
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if (!IsSuspiciousPhysicalPath(physicalPath, out pathTooLong)) {
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return false;
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}
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if (!pathTooLong) {
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return true;
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}
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// physical path too long -> not good because we still need to make
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// it work for virtual path provider scenarios
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// first a few simple checks:
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if (physicalPath.IndexOf('/') >= 0) {
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return true;
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}
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string slashDots = "\\..";
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int idxSlashDots = physicalPath.IndexOf(slashDots, StringComparison.Ordinal);
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if (idxSlashDots >= 0
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&& (physicalPath.Length == idxSlashDots + slashDots.Length
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|| physicalPath[idxSlashDots + slashDots.Length] == '\\')) {
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return true;
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}
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// the real check is to go right to left until there is no longer path-too-long
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// and see if the canonicalization check fails then
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int pos = physicalPath.LastIndexOf('\\');
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while (pos >= 0) {
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string path = physicalPath.Substring(0, pos);
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if (!IsSuspiciousPhysicalPath(path, out pathTooLong)) {
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// reached a non-suspicious path that is not too long
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return false;
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}
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if (!pathTooLong) {
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// reached a suspicious path that is not too long
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return true;
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}
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// trim the path some more
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pos = physicalPath.LastIndexOf('\\', pos-1);
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}
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// backtracted to the end without reaching a non-suspicious path
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// this is suspicious (should happen because app root at least should be ok)
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return true;
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}
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private static readonly char[] s_invalidPathChars = Path.GetInvalidPathChars();
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// VSWhidbey 609102 - Medium trust apps may hit this method, and if the physical path exists,
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// Path.GetFullPath will seek PathDiscovery permissions and throw an exception.
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[FileIOPermissionAttribute(SecurityAction.Assert, AllFiles=FileIOPermissionAccess.PathDiscovery)]
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static internal bool IsSuspiciousPhysicalPath(string physicalPath, out bool pathTooLong) {
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bool isSuspicious;
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// DevDiv 340712: GetConfigPathData generates n^2 exceptions where n is number of incorrectly placed '/'
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// Explicitly prevent frequent exception cases since this method is called a few times per url segment
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if ((physicalPath != null) &&
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(physicalPath.Length > _maxPathLength ||
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physicalPath.IndexOfAny(s_invalidPathChars) != -1 ||
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// Contains ':' at any position other than 2nd char
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(physicalPath.Length > 0 && physicalPath[0] == ':') ||
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(physicalPath.Length > 2 && physicalPath.IndexOf(':', 2) > 0))) {
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// see comment below
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pathTooLong = true;
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return true;
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}
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try {
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isSuspicious = !String.IsNullOrEmpty(physicalPath) &&
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String.Compare(physicalPath, Path.GetFullPath(physicalPath),
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StringComparison.OrdinalIgnoreCase) != 0;
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pathTooLong = false;
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}
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catch (PathTooLongException) {
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isSuspicious = true;
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pathTooLong = true;
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}
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catch (NotSupportedException) {
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// see comment below -- we do the same for ':'
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isSuspicious = true;
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pathTooLong = true;
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}
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catch (ArgumentException) {
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// DevDiv Bugs 152256: Illegal characters {",|} in path prevent configuration system from working.
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// We need to catch this exception and conservatively assume that the path is suspicious in
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// such a case.
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// We also set pathTooLong to true because at this point we do not know if the path is too long
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// or not. If we assume that pathTooLong is false, it means that our path length enforcement
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// is bypassed by using URLs with illegal characters. We do not want that. Moreover, returning
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// pathTooLong = true causes the current logic to peel of URL fragments, which can also find a
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// path without illegal characters to retrieve the config.
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isSuspicious = true;
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pathTooLong = true;
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}
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return isSuspicious;
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}
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static bool HasInvalidLastChar(string physicalPath) {
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// see VSWhidbey #108945
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// We need to filter out directory names which end
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// in " " or ".". We want to treat path names that
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// end in these characters as files - however, Windows
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// will strip these characters off the end of the name,
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// which may result in the name being treated as a
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// directory instead.
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if (String.IsNullOrEmpty(physicalPath)) {
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return false;
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}
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char lastChar = physicalPath[physicalPath.Length - 1];
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return lastChar == ' ' || lastChar == '.';
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}
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internal static bool DirectoryExists(String dirname) {
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bool exists = false;
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dirname = RemoveTrailingDirectoryBackSlash(dirname);
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if (HasInvalidLastChar(dirname))
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return false;
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try {
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exists = Directory.Exists(dirname);
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}
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catch {
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}
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return exists;
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}
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internal static bool DirectoryAccessible(String dirname) {
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bool accessible = false;
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dirname = RemoveTrailingDirectoryBackSlash(dirname);
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if (HasInvalidLastChar(dirname))
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return false;
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try {
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accessible = (new DirectoryInfo(dirname)).Exists;
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}
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catch {
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}
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return accessible;
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}
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private static Char[] _invalidFileNameChars = Path.GetInvalidFileNameChars();
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internal static bool IsValidDirectoryName(String name) {
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if (String.IsNullOrEmpty(name)) {
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return false;
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}
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if (name.IndexOfAny(_invalidFileNameChars, 0) != -1) {
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return false;
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}
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if (name.Equals(".") || name.Equals("..")) {
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return false;
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}
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return true;
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}
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//
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// Given a physical path, determine if it exists, and whether it is a directory or file.
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//
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// If directoryExistsOnError is set, set exists=true and isDirectory=true if we cannot confirm that the path does not exist.
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// If fileExistsOnError is set, set exists=true and isDirectory=false if we cannot confirm that the path does not exist.
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//
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// this code is called by config that doesn't have AspNetHostingPermission
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internal static void PhysicalPathStatus(string physicalPath, bool directoryExistsOnError, bool fileExistsOnError, out bool exists, out bool isDirectory) {
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exists = false;
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isDirectory = true;
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Debug.Assert(!(directoryExistsOnError && fileExistsOnError), "!(directoryExistsOnError && fileExistsOnError)");
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if (String.IsNullOrEmpty(physicalPath))
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return;
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using (new ApplicationImpersonationContext()) {
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UnsafeNativeMethods.WIN32_FILE_ATTRIBUTE_DATA data;
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bool ok = UnsafeNativeMethods.GetFileAttributesEx(physicalPath, UnsafeNativeMethods.GetFileExInfoStandard, out data);
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if (ok) {
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exists = true;
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isDirectory = ((data.fileAttributes & (int) FileAttributes.Directory) == (int) FileAttributes.Directory);
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if (isDirectory && HasInvalidLastChar(physicalPath)) {
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exists = false;
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}
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}
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else {
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if (directoryExistsOnError || fileExistsOnError) {
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// Set exists to true if we cannot confirm that the path does NOT exist.
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int hr = Marshal.GetHRForLastWin32Error();
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if (!(hr == HResults.E_FILENOTFOUND || hr == HResults.E_PATHNOTFOUND)) {
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exists = true;
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isDirectory = directoryExistsOnError;
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}
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}
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}
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}
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}
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//
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// Use to avoid the perf hit of a Demand when the Demand is not necessary for security.
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//
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// If trueOnError is set, then return true if we cannot confirm that the file does NOT exist.
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//
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internal static bool DirectoryExists(string filename, bool trueOnError) {
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filename = RemoveTrailingDirectoryBackSlash(filename);
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if (HasInvalidLastChar(filename)) {
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return false;
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}
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UnsafeNativeMethods.WIN32_FILE_ATTRIBUTE_DATA data;
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bool ok = UnsafeNativeMethods.GetFileAttributesEx(filename, UnsafeNativeMethods.GetFileExInfoStandard, out data);
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if (ok) {
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// The path exists. Return true if it is a directory, false if a file.
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return (data.fileAttributes & (int) FileAttributes.Directory) == (int) FileAttributes.Directory;
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}
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else {
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if (!trueOnError) {
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return false;
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}
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else {
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// Return true if we cannot confirm that the file does NOT exist.
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int hr = Marshal.GetHRForLastWin32Error();
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if (hr == HResults.E_FILENOTFOUND || hr == HResults.E_PATHNOTFOUND) {
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return false;
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}
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else {
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return true;
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}
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}
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}
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}
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}
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//
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// Wraps the Win32 API FindFirstFile
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//
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sealed class FindFileData {
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private FileAttributesData _fileAttributesData;
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private string _fileNameLong;
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private string _fileNameShort;
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internal string FileNameLong { get { return _fileNameLong; } }
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internal string FileNameShort { get { return _fileNameShort; } }
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internal FileAttributesData FileAttributesData { get { return _fileAttributesData; } }
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// FindFile - given a file name, gets the file attributes and short form (8.3 format) of a file name.
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static internal int FindFile(string path, out FindFileData data) {
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IntPtr hFindFile;
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UnsafeNativeMethods.WIN32_FIND_DATA wfd;
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data = null;
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// Remove trailing slash if any, otherwise FindFirstFile won't work correctly
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path = FileUtil.RemoveTrailingDirectoryBackSlash(path);
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#if DBG
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Debug.Assert(Path.GetDirectoryName(path) != null, "Path.GetDirectoryName(path) != null");
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Debug.Assert(Path.GetFileName(path) != null, "Path.GetFileName(path) != null");
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#endif
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hFindFile = UnsafeNativeMethods.FindFirstFile(path, out wfd);
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int lastError = Marshal.GetLastWin32Error(); // FXCOP demands that this preceed the ==
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if (hFindFile == UnsafeNativeMethods.INVALID_HANDLE_VALUE) {
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return HttpException.HResultFromLastError(lastError);
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}
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UnsafeNativeMethods.FindClose(hFindFile);
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#if DBG
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string file = Path.GetFileName(path);
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file = file.TrimEnd(' ', '.');
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Debug.Assert(StringUtil.EqualsIgnoreCase(file, wfd.cFileName) ||
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StringUtil.EqualsIgnoreCase(file, wfd.cAlternateFileName),
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"Path to FindFile is not for a single file: " + path);
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#endif
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data = new FindFileData(ref wfd);
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return HResults.S_OK;
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}
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// FindFile - takes a full-path and a root-directory-path, and is used to get the
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// short form (8.3 format) of the relative-path. A FindFileData structure is returned
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// with FileNameLong and FileNameShort relative to the specified root-directory-path.
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//
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// For example, if full-path is "c:\vdir\subdirectory\t.aspx" and root-directory-path
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// is "c:\vdir", then the relative-path will be "subdirectory\t.aspx" and it's short
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// form will be something like "subdir~1\t~1.ASP".
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//
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// This is used by FileChangesMonitor to support the ability to monitor all files and
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// directories at any depth beneath the application root directory.
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internal static int FindFile(string fullPath, string rootDirectoryPath, out FindFileData data) {
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int hr = FindFileData.FindFile(fullPath, out data);
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if (hr != HResults.S_OK || String.IsNullOrEmpty(rootDirectoryPath)) {
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return hr;
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}
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#if DBG
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// The trailing slash should have been removed already, unless the root is "c:\"
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Debug.Assert(rootDirectoryPath.Length < 4 || rootDirectoryPath[rootDirectoryPath.Length-1] != '\\', "Trailing slash unexpected: " + rootDirectoryPath);
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#endif
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// remove it just in case
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rootDirectoryPath = FileUtil.RemoveTrailingDirectoryBackSlash(rootDirectoryPath);
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#if DBG
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Debug.Assert(fullPath.IndexOf(rootDirectoryPath, StringComparison.OrdinalIgnoreCase) == 0,
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"fullPath (" + fullPath + ") is not within rootDirectoryPath (" + rootDirectoryPath + ")");
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#endif
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// crawl backwards along the subdirectories of fullPath until we get to the specified rootDirectoryPath
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string relativePathLong = String.Empty;
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string relativePathShort = String.Empty;
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string currentParentDir = Path.GetDirectoryName(fullPath);
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while (currentParentDir != null
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&& currentParentDir.Length > rootDirectoryPath.Length+1
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&& currentParentDir.IndexOf(rootDirectoryPath, StringComparison.OrdinalIgnoreCase) == 0) {
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UnsafeNativeMethods.WIN32_FIND_DATA fd;
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IntPtr hFindFile = UnsafeNativeMethods.FindFirstFile(currentParentDir, out fd);
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int lastError = Marshal.GetLastWin32Error(); // FXCOP demands that this preceed the ==
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if (hFindFile == UnsafeNativeMethods.INVALID_HANDLE_VALUE) {
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return HttpException.HResultFromLastError(lastError);
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}
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UnsafeNativeMethods.FindClose(hFindFile);
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#if DBG
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Debug.Assert(!String.IsNullOrEmpty(fd.cFileName), "!String.IsNullOrEmpty(fd.cFileName)");
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#endif
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// build the long and short versions of the relative path
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relativePathLong = fd.cFileName + Path.DirectorySeparatorChar + relativePathLong;
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if (!String.IsNullOrEmpty(fd.cAlternateFileName)) {
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relativePathShort = fd.cAlternateFileName + Path.DirectorySeparatorChar + relativePathShort;
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}
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else {
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relativePathShort = fd.cFileName + Path.DirectorySeparatorChar + relativePathShort;
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}
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currentParentDir = Path.GetDirectoryName(currentParentDir);
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}
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if (!String.IsNullOrEmpty(relativePathLong)) {
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data.PrependRelativePath(relativePathLong, relativePathShort);
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}
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#if DBG
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Debug.Trace("FindFile", "fullPath=" + fullPath + ", rootDirectoryPath=" + rootDirectoryPath);
|
|
Debug.Trace("FindFile", "relativePathLong=" + relativePathLong + ", relativePathShort=" + relativePathShort);
|
|
string fileNameShort = data.FileNameShort == null ? "<null>" : data.FileNameShort;
|
|
Debug.Trace("FindFile", "FileNameLong=" + data.FileNameLong + ", FileNameShrot=" + fileNameShort);
|
|
#endif
|
|
|
|
return hr;
|
|
}
|
|
|
|
internal FindFileData(ref UnsafeNativeMethods.WIN32_FIND_DATA wfd) {
|
|
_fileAttributesData = new FileAttributesData(ref wfd);
|
|
_fileNameLong = wfd.cFileName;
|
|
if (wfd.cAlternateFileName != null
|
|
&& wfd.cAlternateFileName.Length > 0
|
|
&& !StringUtil.EqualsIgnoreCase(wfd.cFileName, wfd.cAlternateFileName)) {
|
|
_fileNameShort = wfd.cAlternateFileName;
|
|
}
|
|
}
|
|
|
|
private void PrependRelativePath(string relativePathLong, string relativePathShort) {
|
|
_fileNameLong = relativePathLong + _fileNameLong;
|
|
|
|
// if the short form is null or empty, prepend the short relative path to the long form
|
|
string fileName = String.IsNullOrEmpty(_fileNameShort) ? _fileNameLong : _fileNameShort;
|
|
_fileNameShort = relativePathShort + fileName;
|
|
|
|
// if the short form is the same as the long form, set the short form to null
|
|
if (StringUtil.EqualsIgnoreCase(_fileNameShort, _fileNameLong)) {
|
|
_fileNameShort = null;
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// Wraps the Win32 API GetFileAttributesEx
|
|
// We use this api in addition to FindFirstFile because FindFirstFile
|
|
// does not work for volumes (e.g. "c:\")
|
|
//
|
|
sealed class FileAttributesData {
|
|
internal readonly FileAttributes FileAttributes;
|
|
internal readonly DateTime UtcCreationTime;
|
|
internal readonly DateTime UtcLastAccessTime;
|
|
internal readonly DateTime UtcLastWriteTime;
|
|
internal readonly long FileSize;
|
|
|
|
static internal FileAttributesData NonExistantAttributesData {
|
|
get {
|
|
return new FileAttributesData();
|
|
}
|
|
}
|
|
|
|
static internal int GetFileAttributes(string path, out FileAttributesData fad) {
|
|
fad = null;
|
|
|
|
UnsafeNativeMethods.WIN32_FILE_ATTRIBUTE_DATA data;
|
|
if (!UnsafeNativeMethods.GetFileAttributesEx(path, UnsafeNativeMethods.GetFileExInfoStandard, out data)) {
|
|
return HttpException.HResultFromLastError(Marshal.GetLastWin32Error());
|
|
}
|
|
|
|
fad = new FileAttributesData(ref data);
|
|
return HResults.S_OK;
|
|
}
|
|
|
|
FileAttributesData() {
|
|
FileSize = -1;
|
|
}
|
|
|
|
FileAttributesData(ref UnsafeNativeMethods.WIN32_FILE_ATTRIBUTE_DATA data) {
|
|
FileAttributes = (FileAttributes) data.fileAttributes;
|
|
UtcCreationTime = DateTimeUtil.FromFileTimeToUtc(((long)data.ftCreationTimeHigh) << 32 | (long)data.ftCreationTimeLow);
|
|
UtcLastAccessTime = DateTimeUtil.FromFileTimeToUtc(((long)data.ftLastAccessTimeHigh) << 32 | (long)data.ftLastAccessTimeLow);
|
|
UtcLastWriteTime = DateTimeUtil.FromFileTimeToUtc(((long)data.ftLastWriteTimeHigh) << 32 | (long)data.ftLastWriteTimeLow);
|
|
FileSize = (long)(uint)data.fileSizeHigh << 32 | (long)(uint)data.fileSizeLow;
|
|
}
|
|
|
|
internal FileAttributesData(ref UnsafeNativeMethods.WIN32_FIND_DATA wfd) {
|
|
FileAttributes = (FileAttributes) wfd.dwFileAttributes;
|
|
UtcCreationTime = DateTimeUtil.FromFileTimeToUtc(((long)wfd.ftCreationTime_dwHighDateTime) << 32 | (long)wfd.ftCreationTime_dwLowDateTime);
|
|
UtcLastAccessTime = DateTimeUtil.FromFileTimeToUtc(((long)wfd.ftLastAccessTime_dwHighDateTime) << 32 | (long)wfd.ftLastAccessTime_dwLowDateTime);
|
|
UtcLastWriteTime = DateTimeUtil.FromFileTimeToUtc(((long)wfd.ftLastWriteTime_dwHighDateTime) << 32 | (long)wfd.ftLastWriteTime_dwLowDateTime);
|
|
FileSize = (long)wfd.nFileSizeHigh << 32 | (long)wfd.nFileSizeLow;
|
|
}
|
|
|
|
#if DBG
|
|
internal string DebugDescription(string indent) {
|
|
StringBuilder sb = new StringBuilder(200);
|
|
string i2 = indent + " ";
|
|
|
|
sb.Append(indent + "FileAttributesData\n");
|
|
sb.Append(i2 + "FileAttributes: " + FileAttributes + "\n");
|
|
sb.Append(i2 + " CreationTime: " + Debug.FormatUtcDate(UtcCreationTime) + "\n");
|
|
sb.Append(i2 + "LastAccessTime: " + Debug.FormatUtcDate(UtcLastAccessTime) + "\n");
|
|
sb.Append(i2 + " LastWriteTime: " + Debug.FormatUtcDate(UtcLastWriteTime) + "\n");
|
|
sb.Append(i2 + " FileSize: " + FileSize.ToString("n0", NumberFormatInfo.InvariantInfo) + "\n");
|
|
|
|
return sb.ToString();
|
|
}
|
|
#endif
|
|
|
|
}
|
|
|
|
}
|