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Diffstat (limited to 'Duplicati/Library/Utility/CallContextSettings.cs')
| -rw-r--r-- | Duplicati/Library/Utility/CallContextSettings.cs | 325 |
1 files changed, 325 insertions, 0 deletions
diff --git a/Duplicati/Library/Utility/CallContextSettings.cs b/Duplicati/Library/Utility/CallContextSettings.cs new file mode 100644 index 000000000..d8115cbac --- /dev/null +++ b/Duplicati/Library/Utility/CallContextSettings.cs @@ -0,0 +1,325 @@ +// Copyright (C) 2017, The Duplicati Team
+// http://www.duplicati.com, info@duplicati.com
+//
+// This library is free software; you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation; either version 2.1 of the
+// License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+using System; +using System.Collections.Generic;
+using System.Linq;
+using System.Net.Security;
+using System.Runtime.Remoting.Messaging;
+using System.Security.Cryptography.X509Certificates;
+
+namespace Duplicati.Library.Utility +{
+ internal static class SystemContextSettings
+ {
+ private struct SystemSettings
+ {
+ public string Tempdir;
+ public long Buffersize;
+ }
+
+ public static IDisposable StartSession(string tempdir = null, long buffersize = 0)
+ {
+ if (string.IsNullOrWhiteSpace(tempdir))
+ tempdir = System.IO.Path.GetTempPath();
+
+ if (buffersize < 1024)
+ buffersize = 64 * 1024;
+
+ return CallContextSettings<SystemSettings>.StartContext(new SystemSettings()
+ {
+ Tempdir = tempdir,
+ Buffersize = buffersize
+ });
+ }
+
+ public static string Tempdir
+ {
+ get
+ {
+ var tf = CallContextSettings<SystemSettings>.Settings.Tempdir;
+ if (string.IsNullOrWhiteSpace(tf))
+ tf = System.IO.Path.GetTempPath();
+ return tf;
+ }
+ set
+ {
+ lock (CallContextSettings<SystemSettings>._lock)
+ {
+ var st = CallContextSettings<SystemSettings>.Settings;
+ st.Tempdir = value;
+ CallContextSettings<SystemSettings>.Settings = st;
+ }
+ }
+ }
+
+ public static long Buffersize
+ {
+ get
+ {
+ var bs = CallContextSettings<SystemSettings>.Settings.Buffersize;
+ if (bs < 1024) + bs = 64 * 1024;
+ return bs; + }
+ } + }
+
+
+ /// <summary>
+ /// Class for providing call-context access to http settings
+ /// </summary>
+ public static class HttpContextSettings
+ {
+ /// <summary>
+ /// Internal struct with properties
+ /// </summary> + private struct HttpSettings
+ {
+ /// <summary>
+ /// Gets or sets the operation timeout.
+ /// </summary>
+ /// <value>The operation timeout.</value> + public TimeSpan OperationTimeout;
+ /// <summary>
+ /// Gets or sets the read write timeout.
+ /// </summary>
+ /// <value>The read write timeout.</value> + public TimeSpan ReadWriteTimeout;
+ /// <summary>
+ /// Gets or sets a value indicating whether http requests are buffered.
+ /// </summary>
+ /// <value><c>true</c> if buffer requests; otherwise, <c>false</c>.</value> + public bool BufferRequests;
+ /// <summary>
+ /// Gets or sets the certificate validator.
+ /// </summary>
+ /// <value>The certificate validator.</value>
+ public SslCertificateValidator CertificateValidator;
+ } +
+ /// <summary>
+ /// Starts a new session
+ /// </summary>
+ /// <returns>The session.</returns>
+ /// <param name="operationTimeout">The operation timeout.</param>
+ /// <param name="readwriteTimeout">The readwrite timeout.</param>
+ /// <param name="bufferRequests">If set to <c>true</c> http requests are buffered.</param> + public static IDisposable StartSession(TimeSpan operationTimeout = default(TimeSpan), TimeSpan readwriteTimeout = default(TimeSpan), bool bufferRequests = false, bool acceptAnyCertificate = false, string[] allowedCertificates = null)
+ {
+ // Make sure we always use our own version of the callback + System.Net.ServicePointManager.ServerCertificateValidationCallback = ServicePointManagerCertificateCallback;
+ + return CallContextSettings<HttpSettings>.StartContext(new HttpSettings()
+ {
+ OperationTimeout = operationTimeout,
+ ReadWriteTimeout = readwriteTimeout,
+ BufferRequests = bufferRequests,
+ CertificateValidator = acceptAnyCertificate || (allowedCertificates != null)
+ ? new SslCertificateValidator(acceptAnyCertificate, allowedCertificates)
+ : null
+ });
+ }
+
+ /// <summary>
+ /// The callback used to defer the call context, such that each scope can have its own callback
+ /// </summary>
+ /// <returns><c>true</c>, if point manager certificate callback was serviced, <c>false</c> otherwise.</returns>
+ /// <param name="sender">The sender of the validation.</param>
+ /// <param name="certificate">The certificate to validate.</param>
+ /// <param name="chain">The certificate chain.</param>
+ /// <param name="sslPolicyErrors">Errors discovered.</param>
+ private static bool ServicePointManagerCertificateCallback(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
+ {
+ // If we have a custom SSL validator, invoke it
+ if (HttpContextSettings.CertificateValidator != null)
+ return CertificateValidator.ValidateServerCertficate(sender, certificate, chain, sslPolicyErrors); + + // Default is to only approve certificates without errors + var result = sslPolicyErrors == SslPolicyErrors.None;
+
+ // Hack: If we have no validator, see if the context is all messed up
+ // This is not the right way, but ServicePointManager is not designed right for this
+ var any = false;
+ foreach (var v in CallContextSettings<HttpSettings>.GetAllInstances())
+ if (v.CertificateValidator != null)
+ { + var t = v.CertificateValidator.ValidateServerCertficate(sender, certificate, chain, sslPolicyErrors);
+
+ // First instance overrides framework result
+ if (!any)
+ result = t;
+
+ // If there are more, we see if anyone will accept it
+ else
+ result |= t;
+
+ any = true;
+ }
+
+ return result;
+ } +
+ /// <summary>
+ /// Gets the operation timeout.
+ /// </summary>
+ /// <value>The operation timeout.</value> + public static TimeSpan OperationTimeout => CallContextSettings<HttpSettings>.Settings.OperationTimeout;
+ /// <summary>
+ /// Gets the read-write timeout.
+ /// </summary>
+ /// <value>The read write timeout.</value> + public static TimeSpan ReadWriteTimeout => CallContextSettings<HttpSettings>.Settings.ReadWriteTimeout;
+ /// <summary>
+ /// Gets a value indicating whether https requests are buffered.
+ /// </summary>
+ /// <value><c>true</c> if buffer requests; otherwise, <c>false</c>.</value> + public static bool BufferRequests => CallContextSettings<HttpSettings>.Settings.BufferRequests;
+ /// <summary>
+ /// Gets or sets the certificate validator.
+ /// </summary>
+ /// <value>The certificate validator.</value>
+ public static SslCertificateValidator CertificateValidator => CallContextSettings<HttpSettings>.Settings.CertificateValidator;
+ + } +
+ /// <summary>
+ /// Help class for providing settings in the current call context
+ /// </summary> + public static class CallContextSettings<T> + {
+ /// <summary>
+ /// Shared key for storing a value in the call context
+ /// </summary>
+ private const string SETTINGS_KEY_NAME = "duplicati-session-settings";
+
+ /// <summary>
+ /// The settings that are stored in the call context, which are not serializable
+ /// </summary>
+ private static Dictionary<string, T> _setttings = new Dictionary<string, T>();
+
+ /// <summary>
+ /// Lock for protecting the dictionary
+ /// </summary>
+ public static readonly object _lock = new object();
+
+ /// <summary>
+ /// Gets all instances currently registered
+ /// </summary>
+ internal static T[] GetAllInstances()
+ {
+ lock (_lock)
+ return _setttings.Values.ToArray();
+ }
+
+ /// <summary>
+ /// Gets or sets the values in the current call context
+ /// </summary>
+ /// <value>The settings.</value>
+ public static T Settings
+ {
+ get
+ {
+ T res;
+ var key = ContextID;
+ if (string.IsNullOrWhiteSpace(key))
+ return default(T);
+
+ if (!_setttings.TryGetValue(key, out res))
+ lock (_lock)
+ if (!_setttings.TryGetValue(key, out res))
+ return default(T);
+
+ return res;
+ }
+ set
+ { + var key = ContextID;
+ if (!string.IsNullOrWhiteSpace(key))
+ lock (_lock)
+ _setttings[key] = value;
+ }
+ }
+
+ /// <summary>
+ /// Help class for providing a way to release resources associated with a call context
+ /// </summary>
+ private class ContextGuard : IDisposable
+ {
+ /// <summary>
+ /// Randomly generated identifier
+ /// </summary>
+ private readonly string ID = Guid.NewGuid().ToString();
+
+ /// <summary>
+ /// Initializes a new instance of the
+ /// <see cref="T:Duplicati.Library.Utility.CallContextSettings`1.ContextGuard"/> class,
+ /// and sets up the call context
+ /// </summary>
+ public ContextGuard()
+ { + CallContext.LogicalSetData(SETTINGS_KEY_NAME, ID); + }
+
+ /// <summary>
+ /// Releases all resource used by the
+ /// <see cref="T:Duplicati.Library.Utility.CallContextSettings`1.ContextGuard"/> object.
+ /// </summary>
+ /// <remarks>Call <see cref="Dispose"/> when you are finished using the
+ /// <see cref="T:Duplicati.Library.Utility.CallContextSettings`1.ContextGuard"/>. The <see cref="Dispose"/>
+ /// method leaves the <see cref="T:Duplicati.Library.Utility.CallContextSettings`1.ContextGuard"/> in an
+ /// unusable state. After calling <see cref="Dispose"/>, you must release all references to the
+ /// <see cref="T:Duplicati.Library.Utility.CallContextSettings`1.ContextGuard"/> so the garbage collector
+ /// can reclaim the memory that the
+ /// <see cref="T:Duplicati.Library.Utility.CallContextSettings`1.ContextGuard"/> was occupying.</remarks>
+ public void Dispose()
+ {
+ lock (_lock)
+ {
+ // Release the resources, if any
+ _setttings.Remove(ID);
+ }
+
+ CallContext.LogicalSetData(SETTINGS_KEY_NAME, null);
+ }
+ }
+
+ /// <summary>
+ /// Starts the context wit a default value.
+ /// </summary>
+ /// <returns>The disposable handle for the context.</returns>
+ /// <param name="initial">The initial value.</param>
+ public static IDisposable StartContext(T initial = default(T))
+ {
+ var res = new ContextGuard();
+ Settings = initial;
+ return res; + }
+
+ /// <summary>
+ /// Gets the context ID for this call.
+ /// </summary>
+ /// <value>The context identifier.</value>
+ private static string ContextID
+ {
+ get
+ {
+ return CallContext.LogicalGetData(SETTINGS_KEY_NAME) as string;
+ }
+ }
+ + } +} |