| | | 1 | | // Licensed to the .NET Foundation under one or more agreements. |
| | | 2 | | // The .NET Foundation licenses this file to you under the MIT license. |
| | | 3 | | |
| | | 4 | | using System; |
| | | 5 | | using System.Collections.Generic; |
| | | 6 | | using System.Runtime.InteropServices; |
| | | 7 | | using System.Security.Cryptography; |
| | | 8 | | using System.Text; |
| | | 9 | | using System.ComponentModel; |
| | | 10 | | using System.Security.Principal; |
| | | 11 | | using System.Security.AccessControl; |
| | | 12 | | using CoreWCF.IO; |
| | | 13 | | using System.Globalization; |
| | | 14 | | using System.Threading; |
| | | 15 | | using CoreWCF.Security; |
| | | 16 | | using Microsoft.Extensions.Logging; |
| | | 17 | | using System.Runtime.Versioning; |
| | | 18 | | |
| | | 19 | | namespace CoreWCF.Channels |
| | | 20 | | { |
| | | 21 | | // Handles manipulating the net.pipe uri to a predictable shared memory path. If the path is too long, |
| | | 22 | | // it's shortened by using a hash algorithm. This matches the algorithm the client uses to find |
| | | 23 | | // the shared memory path. The shared memory will then contain the actual named pipe name which is |
| | | 24 | | // unique from one run to the next. |
| | | 25 | | [SupportedOSPlatform("windows")] |
| | | 26 | | internal static class PipeUri |
| | | 27 | | { |
| | | 28 | | public static void Validate(Uri uri) |
| | | 29 | | { |
| | | 30 | | if (uri.Scheme != Uri.UriSchemeNetPipe) |
| | | 31 | | throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(nameof(uri), SR.PipeUriSchemeWrong); |
| | | 32 | | } |
| | | 33 | | |
| | | 34 | | public static string BuildSharedMemoryName(Uri uri, HostNameComparisonMode hostNameComparisonMode, bool global) |
| | | 35 | | { |
| | | 36 | | string path = GetPath(uri); |
| | | 37 | | string host = null; |
| | | 38 | | |
| | | 39 | | switch (hostNameComparisonMode) |
| | | 40 | | { |
| | | 41 | | case HostNameComparisonMode.StrongWildcard: |
| | | 42 | | host = "+"; |
| | | 43 | | break; |
| | | 44 | | case HostNameComparisonMode.Exact: |
| | | 45 | | host = uri.Host; |
| | | 46 | | break; |
| | | 47 | | case HostNameComparisonMode.WeakWildcard: |
| | | 48 | | host = "*"; |
| | | 49 | | break; |
| | | 50 | | } |
| | | 51 | | |
| | | 52 | | return BuildSharedMemoryName(host, path, global); |
| | | 53 | | } |
| | | 54 | | |
| | | 55 | | private static string BuildSharedMemoryName(string hostName, string path, bool global) |
| | | 56 | | { |
| | | 57 | | StringBuilder builder = new StringBuilder(); |
| | | 58 | | builder.Append(Uri.UriSchemeNetPipe); |
| | | 59 | | builder.Append("://"); |
| | | 60 | | builder.Append(hostName.ToUpperInvariant()); |
| | | 61 | | builder.Append(path); |
| | | 62 | | string canonicalName = builder.ToString(); |
| | | 63 | | |
| | | 64 | | byte[] canonicalBytes = Encoding.UTF8.GetBytes(canonicalName); |
| | | 65 | | byte[] hashedBytes; |
| | | 66 | | string separator; |
| | | 67 | | |
| | | 68 | | if (canonicalBytes.Length >= 128) |
| | | 69 | | { |
| | | 70 | | using (HashAlgorithm hash = GetHashAlgorithm()) |
| | | 71 | | { |
| | | 72 | | hashedBytes = hash.ComputeHash(canonicalBytes); |
| | | 73 | | } |
| | | 74 | | separator = ":H"; |
| | | 75 | | } |
| | | 76 | | else |
| | | 77 | | { |
| | | 78 | | hashedBytes = canonicalBytes; |
| | | 79 | | separator = ":E"; |
| | | 80 | | } |
| | | 81 | | |
| | | 82 | | builder = new StringBuilder(); |
| | | 83 | | if (global) |
| | | 84 | | { |
| | | 85 | | // we may need to create the shared memory in the global namespace so we work with terminal services+adm |
| | | 86 | | builder.Append(@"Global\"); |
| | | 87 | | } |
| | | 88 | | else |
| | | 89 | | { |
| | | 90 | | builder.Append(@"Local\"); |
| | | 91 | | } |
| | | 92 | | builder.Append(Uri.UriSchemeNetPipe); |
| | | 93 | | builder.Append(separator); |
| | | 94 | | builder.Append(Convert.ToBase64String(hashedBytes)); |
| | | 95 | | return builder.ToString(); |
| | | 96 | | } |
| | | 97 | | |
| | | 98 | | public static string GetPath(Uri uri) |
| | | 99 | | { |
| | | 100 | | string path = uri.LocalPath.ToUpperInvariant(); |
| | | 101 | | if (!path.EndsWith("/", StringComparison.Ordinal)) |
| | | 102 | | path = path + "/"; |
| | | 103 | | return path; |
| | | 104 | | } |
| | | 105 | | |
| | | 106 | | internal const string UseSha1InPipeConnectionGetHashAlgorithmString = "Switch.System.ServiceModel.UseSha1InPipeC |
| | | 107 | | internal static bool s_useSha1InPipeConnectionGetHashAlgorithm = AppContext.TryGetSwitch(UseSha1InPipeConnection |
| | | 108 | | |
| | | 109 | | private static HashAlgorithm GetHashAlgorithm() |
| | | 110 | | { |
| | | 111 | | if (s_useSha1InPipeConnectionGetHashAlgorithm) |
| | | 112 | | { |
| | | 113 | | return SHA1.Create(); |
| | | 114 | | } |
| | | 115 | | else |
| | | 116 | | { |
| | | 117 | | return SHA256.Create(); |
| | | 118 | | } |
| | | 119 | | } |
| | | 120 | | } |
| | | 121 | | |
| | | 122 | | // This class handles creating a shared memory object which holds the guid of the actual |
| | | 123 | | // named pipe that clients will connect to. |
| | | 124 | | [SupportedOSPlatform("windows")] |
| | | 125 | | internal unsafe class PipeSharedMemory : IDisposable |
| | | 126 | | { |
| | | 127 | | internal const string PipePrefix = @"\\.\pipe\"; |
| | | 128 | | internal const string PipeLocalPrefix = @"\\.\pipe\Local\"; |
| | | 129 | | private SafeFileMappingHandle _fileMapping; |
| | | 130 | | private string _pipeName; |
| | | 131 | | private string _pipeNameGuidPart; |
| | | 132 | | private readonly Uri _pipeUri; |
| | | 133 | | |
| | | 134 | | private PipeSharedMemory(SafeFileMappingHandle fileMapping, Uri pipeUri) |
| | | 135 | | : this(fileMapping, pipeUri, null) |
| | | 136 | | { |
| | | 137 | | } |
| | | 138 | | |
| | | 139 | | private PipeSharedMemory(SafeFileMappingHandle fileMapping, Uri pipeUri, string pipeName) |
| | | 140 | | { |
| | | 141 | | _pipeName = pipeName; |
| | | 142 | | _fileMapping = fileMapping; |
| | | 143 | | _pipeUri = pipeUri; |
| | | 144 | | } |
| | | 145 | | |
| | | 146 | | public static PipeSharedMemory Create(List<SecurityIdentifier> allowedSids, Uri pipeUri, string sharedMemoryName |
| | | 147 | | { |
| | | 148 | | PipeSharedMemory result; |
| | | 149 | | if (TryCreate(allowedSids, pipeUri, sharedMemoryName, logger, out result)) |
| | | 150 | | { |
| | | 151 | | return result; |
| | | 152 | | } |
| | | 153 | | else |
| | | 154 | | { |
| | | 155 | | throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(CreatePipeNameInUseException(UnsafeNativeMetho |
| | | 156 | | } |
| | | 157 | | } |
| | | 158 | | |
| | | 159 | | public static bool TryCreate(List<SecurityIdentifier> allowedSids, Uri pipeUri, string sharedMemoryName, ILogger |
| | | 160 | | { |
| | | 161 | | Guid pipeGuid = Guid.NewGuid(); |
| | | 162 | | string pipeName = BuildPipeName(pipeGuid.ToString()); |
| | | 163 | | byte[] binarySecurityDescriptor; |
| | | 164 | | try |
| | | 165 | | { |
| | | 166 | | binarySecurityDescriptor = SecurityDescriptorHelper.FromSecurityIdentifiers(allowedSids, UnsafeNativeMet |
| | | 167 | | } |
| | | 168 | | catch (Win32Exception e) |
| | | 169 | | { |
| | | 170 | | // While Win32exceptions are not expected, if they do occur we need to obey the pipe/communication excep |
| | | 171 | | Exception innerException = new PipeException(e.Message, e); |
| | | 172 | | throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new CommunicationException(innerException.Mess |
| | | 173 | | } |
| | | 174 | | |
| | | 175 | | SafeFileMappingHandle fileMapping; |
| | | 176 | | int error; |
| | | 177 | | result = null; |
| | | 178 | | fixed (byte* pinnedSecurityDescriptor = binarySecurityDescriptor) |
| | | 179 | | { |
| | | 180 | | UnsafeNativeMethods.SECURITY_ATTRIBUTES securityAttributes = new UnsafeNativeMethods.SECURITY_ATTRIBUTES |
| | | 181 | | securityAttributes.lpSecurityDescriptor = (IntPtr)pinnedSecurityDescriptor; |
| | | 182 | | |
| | | 183 | | fileMapping = UnsafeNativeMethods.CreateFileMapping((IntPtr)(-1), securityAttributes, |
| | | 184 | | UnsafeNativeMethods.PAGE_READWRITE, 0, sizeof(SharedMemoryContents), sharedMemoryName); |
| | | 185 | | error = Marshal.GetLastWin32Error(); |
| | | 186 | | } |
| | | 187 | | |
| | | 188 | | if (fileMapping.IsInvalid) |
| | | 189 | | { |
| | | 190 | | fileMapping.SetHandleAsInvalid(); |
| | | 191 | | if (error == UnsafeNativeMethods.ERROR_ACCESS_DENIED) |
| | | 192 | | { |
| | | 193 | | return false; |
| | | 194 | | } |
| | | 195 | | else |
| | | 196 | | { |
| | | 197 | | Exception innerException = new PipeException(SR.Format(SR.PipeNameCantBeReserved, |
| | | 198 | | pipeUri.AbsoluteUri, PipeError.GetErrorString(error)), error); |
| | | 199 | | throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new AddressAccessDeniedException(innerExce |
| | | 200 | | } |
| | | 201 | | } |
| | | 202 | | |
| | | 203 | | // now we have a valid file mapping handle |
| | | 204 | | if (error == UnsafeNativeMethods.ERROR_ALREADY_EXISTS) |
| | | 205 | | { |
| | | 206 | | fileMapping.Close(); |
| | | 207 | | throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(CreatePipeNameInUseException(error, pipeUri)); |
| | | 208 | | } |
| | | 209 | | |
| | | 210 | | PipeSharedMemory pipeSharedMemory = new PipeSharedMemory(fileMapping, pipeUri, pipeName); |
| | | 211 | | bool disposeSharedMemory = true; |
| | | 212 | | try |
| | | 213 | | { |
| | | 214 | | pipeSharedMemory.InitializeContents(pipeGuid); |
| | | 215 | | disposeSharedMemory = false; |
| | | 216 | | result = pipeSharedMemory; |
| | | 217 | | |
| | | 218 | | //if (TD.PipeSharedMemoryCreatedIsEnabled()) |
| | | 219 | | //{ |
| | | 220 | | // TD.PipeSharedMemoryCreated(sharedMemoryName); |
| | | 221 | | //} |
| | | 222 | | return true; |
| | | 223 | | } |
| | | 224 | | finally |
| | | 225 | | { |
| | | 226 | | if (disposeSharedMemory) |
| | | 227 | | { |
| | | 228 | | pipeSharedMemory.Dispose(); |
| | | 229 | | } |
| | | 230 | | } |
| | | 231 | | } |
| | | 232 | | |
| | | 233 | | private void InitializeContents(Guid pipeGuid) |
| | | 234 | | { |
| | | 235 | | SafeViewOfFileHandle view = GetView(true); |
| | | 236 | | try |
| | | 237 | | { |
| | | 238 | | SharedMemoryContents* contents = (SharedMemoryContents*)view.DangerousGetHandle(); |
| | | 239 | | contents->pipeGuid = pipeGuid; |
| | | 240 | | Thread.MemoryBarrier(); |
| | | 241 | | contents->isInitialized = true; |
| | | 242 | | } |
| | | 243 | | finally |
| | | 244 | | { |
| | | 245 | | view.Close(); |
| | | 246 | | } |
| | | 247 | | } |
| | | 248 | | |
| | | 249 | | public static Exception CreatePipeNameInUseException(int error, Uri pipeUri) |
| | | 250 | | { |
| | | 251 | | Exception innerException = new PipeException(SR.Format(SR.PipeNameInUse, pipeUri.AbsoluteUri), error); |
| | | 252 | | return new AddressAlreadyInUseException(innerException.Message, innerException); |
| | | 253 | | } |
| | | 254 | | |
| | | 255 | | private SafeViewOfFileHandle GetView(bool writable) |
| | | 256 | | { |
| | | 257 | | SafeViewOfFileHandle handle = UnsafeNativeMethods.MapViewOfFile(_fileMapping, |
| | | 258 | | writable ? UnsafeNativeMethods.FILE_MAP_WRITE : UnsafeNativeMethods.FILE_MAP_READ, |
| | | 259 | | 0, 0, (IntPtr)sizeof(SharedMemoryContents)); |
| | | 260 | | if (handle.IsInvalid) |
| | | 261 | | { |
| | | 262 | | int error = Marshal.GetLastWin32Error(); |
| | | 263 | | handle.SetHandleAsInvalid(); |
| | | 264 | | throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(CreatePipeNameCannotBeAccessedException(error, |
| | | 265 | | } |
| | | 266 | | return handle; |
| | | 267 | | } |
| | | 268 | | |
| | | 269 | | public void Dispose() |
| | | 270 | | { |
| | | 271 | | if (_fileMapping != null) |
| | | 272 | | { |
| | | 273 | | _fileMapping.Dispose(); |
| | | 274 | | _fileMapping = null; |
| | | 275 | | } |
| | | 276 | | } |
| | | 277 | | |
| | | 278 | | public string PipeName |
| | | 279 | | { |
| | | 280 | | get |
| | | 281 | | { |
| | | 282 | | if (_pipeName == null) |
| | | 283 | | { |
| | | 284 | | SafeViewOfFileHandle view = GetView(false); |
| | | 285 | | try |
| | | 286 | | { |
| | | 287 | | SharedMemoryContents* contents = (SharedMemoryContents*)view.DangerousGetHandle(); |
| | | 288 | | if (contents->isInitialized) |
| | | 289 | | { |
| | | 290 | | Thread.MemoryBarrier(); |
| | | 291 | | _pipeNameGuidPart = contents->pipeGuid.ToString(); |
| | | 292 | | _pipeName = BuildPipeName(_pipeNameGuidPart); |
| | | 293 | | } |
| | | 294 | | } |
| | | 295 | | finally |
| | | 296 | | { |
| | | 297 | | view.Close(); |
| | | 298 | | } |
| | | 299 | | } |
| | | 300 | | |
| | | 301 | | return _pipeName; |
| | | 302 | | } |
| | | 303 | | } |
| | | 304 | | |
| | | 305 | | private static Exception CreatePipeNameCannotBeAccessedException(int error, Uri pipeUri) |
| | | 306 | | { |
| | | 307 | | Exception innerException = new PipeException(SR.Format(SR.PipeNameCanNotBeAccessed, PipeError.GetErrorString |
| | | 308 | | return new AddressAccessDeniedException(SR.Format(SR.PipeNameCanNotBeAccessed2, pipeUri.AbsoluteUri), innerE |
| | | 309 | | } |
| | | 310 | | |
| | | 311 | | private static string BuildPipeName(string pipeGuid) |
| | | 312 | | { |
| | | 313 | | return (AppContainerInfo.IsRunningInAppContainer ? PipeLocalPrefix : PipePrefix) + pipeGuid; |
| | | 314 | | } |
| | | 315 | | |
| | | 316 | | [StructLayout(LayoutKind.Sequential)] |
| | | 317 | | private struct SharedMemoryContents |
| | | 318 | | { |
| | | 319 | | public bool isInitialized; |
| | | 320 | | public Guid pipeGuid; |
| | | 321 | | } |
| | | 322 | | } |
| | | 323 | | |
| | | 324 | | internal static class PipeError |
| | | 325 | | { |
| | | 326 | | public static string GetErrorString(int error) |
| | | 327 | | { |
| | | 328 | | StringBuilder stringBuilder = new StringBuilder(512); |
| | | 329 | | if (UnsafeNativeMethods.FormatMessage(UnsafeNativeMethods.FORMAT_MESSAGE_IGNORE_INSERTS | |
| | | 330 | | UnsafeNativeMethods.FORMAT_MESSAGE_FROM_SYSTEM | UnsafeNativeMethods.FORMAT_MESSAGE_ARGUMENT_ARRAY, |
| | | 331 | | IntPtr.Zero, error, CultureInfo.CurrentCulture.LCID, stringBuilder, stringBuilder.Capacity, IntPtr.Zero) |
| | | 332 | | { |
| | | 333 | | stringBuilder = stringBuilder.Replace("\n", ""); |
| | | 334 | | stringBuilder = stringBuilder.Replace("\r", ""); |
| | | 335 | | return SR.Format( |
| | | 336 | | SR.PipeKnownWin32Error, |
| | | 337 | | stringBuilder.ToString(), |
| | | 338 | | error.ToString(CultureInfo.InvariantCulture), |
| | | 339 | | Convert.ToString(error, 16)); |
| | | 340 | | } |
| | | 341 | | else |
| | | 342 | | { |
| | | 343 | | return SR.Format( |
| | | 344 | | SR.PipeUnknownWin32Error, |
| | | 345 | | error.ToString(CultureInfo.InvariantCulture), |
| | | 346 | | Convert.ToString(error, 16)); |
| | | 347 | | } |
| | | 348 | | } |
| | | 349 | | } |
| | | 350 | | |
| | | 351 | | [SupportedOSPlatform("windows")] |
| | | 352 | | internal static class SecurityDescriptorHelper |
| | | 353 | | { |
| | | 354 | | private static byte[] s_worldCreatorOwnerWithReadAndWriteDescriptorDenyNetwork; |
| | | 355 | | private static byte[] GetWorldCreatorOwnerWithReadAndWriteDescriptorDenyNetwork(ILogger logger) |
| | | 356 | | { |
| | 0 | 357 | | if (s_worldCreatorOwnerWithReadAndWriteDescriptorDenyNetwork == null) |
| | | 358 | | { |
| | 0 | 359 | | s_worldCreatorOwnerWithReadAndWriteDescriptorDenyNetwork = FromSecurityIdentifiersFull(null, UnsafeNativ |
| | | 360 | | } |
| | | 361 | | |
| | 0 | 362 | | return s_worldCreatorOwnerWithReadAndWriteDescriptorDenyNetwork; |
| | | 363 | | } |
| | | 364 | | |
| | | 365 | | private static byte[] s_worldCreatorOwnerWithReadDescriptorDenyNetwork; |
| | | 366 | | private static byte[] GetWorldCreatorOwnerWithReadDescriptorDenyNetwork(ILogger logger) |
| | | 367 | | { |
| | 0 | 368 | | if (s_worldCreatorOwnerWithReadDescriptorDenyNetwork == null) |
| | | 369 | | { |
| | 0 | 370 | | s_worldCreatorOwnerWithReadDescriptorDenyNetwork = FromSecurityIdentifiersFull(null, UnsafeNativeMethods |
| | | 371 | | } |
| | | 372 | | |
| | 0 | 373 | | return s_worldCreatorOwnerWithReadDescriptorDenyNetwork; |
| | | 374 | | } |
| | | 375 | | |
| | | 376 | | internal static byte[] FromSecurityIdentifiers(List<SecurityIdentifier> allowedSids, int accessRights, ILogger l |
| | | 377 | | { |
| | 0 | 378 | | if (allowedSids == null) |
| | | 379 | | { |
| | 0 | 380 | | if (accessRights == (UnsafeNativeMethods.GENERIC_READ | UnsafeNativeMethods.GENERIC_WRITE)) |
| | | 381 | | { |
| | 0 | 382 | | return GetWorldCreatorOwnerWithReadAndWriteDescriptorDenyNetwork(logger); |
| | | 383 | | } |
| | | 384 | | |
| | 0 | 385 | | if (accessRights == UnsafeNativeMethods.GENERIC_READ) |
| | | 386 | | { |
| | 0 | 387 | | return GetWorldCreatorOwnerWithReadDescriptorDenyNetwork(logger); |
| | | 388 | | } |
| | | 389 | | } |
| | | 390 | | |
| | 0 | 391 | | return FromSecurityIdentifiersFull(allowedSids, accessRights, logger); |
| | | 392 | | } |
| | | 393 | | |
| | | 394 | | private static byte[] FromSecurityIdentifiersFull(List<SecurityIdentifier> allowedSids, int accessRights, ILogge |
| | | 395 | | { |
| | 0 | 396 | | int capacity = allowedSids == null ? 3 : 2 + allowedSids.Count; |
| | 0 | 397 | | DiscretionaryAcl dacl = new DiscretionaryAcl(false, false, capacity); |
| | | 398 | | |
| | | 399 | | // add deny ACE first so that we don't get short circuited |
| | 0 | 400 | | dacl.AddAccess(AccessControlType.Deny, new SecurityIdentifier(WellKnownSidType.NetworkSid, null), |
| | 0 | 401 | | UnsafeNativeMethods.GENERIC_ALL, InheritanceFlags.None, PropagationFlags.None); |
| | | 402 | | |
| | | 403 | | // clients get different rights, since they shouldn't be able to listen |
| | 0 | 404 | | int clientAccessRights = GenerateClientAccessRights(accessRights); |
| | | 405 | | |
| | 0 | 406 | | if (allowedSids == null) |
| | | 407 | | { |
| | 0 | 408 | | logger.LogDebug("Adding default ACL allow WellKnownSidType.WorldSid to security identifiers"); |
| | 0 | 409 | | dacl.AddAccess(AccessControlType.Allow, new SecurityIdentifier(WellKnownSidType.WorldSid, null), |
| | 0 | 410 | | clientAccessRights, InheritanceFlags.None, PropagationFlags.None); |
| | | 411 | | } |
| | | 412 | | else |
| | | 413 | | { |
| | 0 | 414 | | for (int i = 0; i < allowedSids.Count; i++) |
| | | 415 | | { |
| | 0 | 416 | | SecurityIdentifier allowedSid = allowedSids[i]; |
| | 0 | 417 | | logger.LogDebug("Adding ACL allow SID {allowedSid} to security identifiers", allowedSid); |
| | 0 | 418 | | dacl.AddAccess(AccessControlType.Allow, allowedSid, |
| | 0 | 419 | | clientAccessRights, InheritanceFlags.None, PropagationFlags.None); |
| | | 420 | | } |
| | | 421 | | } |
| | | 422 | | |
| | 0 | 423 | | var processLogonSid = SecurityUtils.GetProcessLogonSid(); |
| | 0 | 424 | | logger.LogDebug("Adding ACL allow Process Logon SID {processLogonSid} to security identifiers", processLogon |
| | 0 | 425 | | dacl.AddAccess(AccessControlType.Allow, processLogonSid, accessRights, InheritanceFlags.None, PropagationFla |
| | | 426 | | |
| | 0 | 427 | | if (AppContainerInfo.IsRunningInAppContainer) |
| | | 428 | | { |
| | | 429 | | // NamedPipeBinding requires dacl with current AppContainer SID |
| | | 430 | | // to setup multiple NamedPipes in the BeginAccept loop. |
| | 0 | 431 | | var appContainerSid = AppContainerInfo.GetCurrentAppContainerSid(); |
| | 0 | 432 | | logger.LogDebug("Adding ACL allow App Container SID {appContainerSid} to security identifiers", appConta |
| | 0 | 433 | | dacl.AddAccess(AccessControlType.Allow, appContainerSid, accessRights, InheritanceFlags.None, Propagatio |
| | | 434 | | } |
| | | 435 | | |
| | 0 | 436 | | CommonSecurityDescriptor securityDescriptor = |
| | 0 | 437 | | new CommonSecurityDescriptor(false, false, ControlFlags.None, null, null, null, dacl); |
| | 0 | 438 | | byte[] binarySecurityDescriptor = new byte[securityDescriptor.BinaryLength]; |
| | 0 | 439 | | securityDescriptor.GetBinaryForm(binarySecurityDescriptor, 0); |
| | 0 | 440 | | return binarySecurityDescriptor; |
| | | 441 | | } |
| | | 442 | | |
| | | 443 | | // Security: We cannot grant rights for FILE_CREATE_PIPE_INSTANCE to clients, otherwise other apps can intercept |
| | | 444 | | // FILE_CREATE_PIPE_INSTANCE is granted in 2 ways, via GENERIC_WRITE or directly specified. Remove both. |
| | | 445 | | private static int GenerateClientAccessRights(int accessRights) |
| | | 446 | | { |
| | 0 | 447 | | int everyoneAccessRights = accessRights; |
| | | 448 | | |
| | 0 | 449 | | if ((everyoneAccessRights & UnsafeNativeMethods.GENERIC_WRITE) != 0) |
| | | 450 | | { |
| | 0 | 451 | | everyoneAccessRights &= ~UnsafeNativeMethods.GENERIC_WRITE; |
| | | 452 | | |
| | | 453 | | // Since GENERIC_WRITE grants the permissions to write to a file, we need to add it back. |
| | | 454 | | const int clientWriteAccess = UnsafeNativeMethods.FILE_WRITE_ATTRIBUTES | UnsafeNativeMethods.FILE_WRITE |
| | 0 | 455 | | everyoneAccessRights |= clientWriteAccess; |
| | | 456 | | } |
| | | 457 | | |
| | | 458 | | // Future proofing: FILE_CREATE_PIPE_INSTANCE isn't used currently but we need to ensure it is not granted. |
| | 0 | 459 | | everyoneAccessRights &= ~UnsafeNativeMethods.FILE_CREATE_PIPE_INSTANCE; |
| | | 460 | | |
| | 0 | 461 | | return everyoneAccessRights; |
| | | 462 | | } |
| | | 463 | | } |
| | | 464 | | } |