mirror of
https://github.com/xcp-ng/xenadmin.git
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327 lines
12 KiB
C#
327 lines
12 KiB
C#
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/* Copyright (c) Citrix Systems Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms,
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* with or without modification, are permitted provided
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* that the following conditions are met:
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*
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* * Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the
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* following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the
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* following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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using System;
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using System.Collections.Generic;
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using System.Configuration;
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using System.Text;
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using System.Diagnostics;
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using System.Runtime.InteropServices;
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using System.Windows.Forms;
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using XenAdmin.Core;
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using XenAdmin.Dialogs;
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using XenAdmin.Network;
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using System.Xml;
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using System.IO;
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using System.Security.AccessControl;
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using System.Security.Principal;
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using System.Drawing;
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namespace XenAdmin
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{
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internal class PasswordsRequest
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{
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private const string NamespaceURI = "http://citrix.com/XenCenter/ConnectionExport";
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private const string TokenIdentifier = "XenCenterPasswordToken";
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private const string RootElement = "XenCenterConnectionExport";
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private const string TokenElement = "token";
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private const string RequestFilename = "XenCenterConnectionRequest.xml";
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private const string ResultFilename = "XenCenterConnectionExport.xml";
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private const char Separator = '\x202f'; // narrow non-breaking space.
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private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
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internal static void HandleRequest(string destdir)
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{
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Process this_process = Process.GetCurrentProcess();
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Process parent = Processes.FindParent(this_process);
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if (parent == null)
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{
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log.Warn("Cannot find parent process. Ignoring request.");
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return;
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}
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WindowsIdentity parent_user = Processes.GetWindowsIdentity(parent);
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WindowsIdentity this_user = Processes.GetWindowsIdentity(this_process);
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if (parent_user == null || this_user == null)
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{
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log.Warn("Cannot find user details. Ignoring request.");
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return;
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}
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if (parent_user.User != this_user.User)
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{
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log.Warn("Passwords requested from user different to us. Ignoring request.");
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return;
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}
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if (!Registry.AllowCredentialSave || !Properties.Settings.Default.SaveSession)
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{
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WriteXML(destdir, null, "nosession");
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return;
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}
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string exepath = Processes.GetExePath(parent);
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string token;
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string token_exepath;
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string user_sid;
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if (ParseToken(destdir, out token, out token_exepath, out user_sid))
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{
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// Valid token.
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if (token_exepath == exepath)
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{
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if (user_sid == this_user.User.ToString())
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{
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CompleteRequest(destdir, token);
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return;
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}
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else
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{
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// Valid token, but for the wrong user. Fall through to reprompt.
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log.WarnFormat("Given token for user {0}, but running as {1}", user_sid, this_user.User);
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}
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}
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else
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{
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// Valid token, but for the wrong app. Fall through to reprompt.
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log.WarnFormat("Given token for {0}, but app is {1}", token_exepath, exepath);
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}
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}
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else
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{
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// Missing or invalid token.
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}
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PasswordsRequestDialog d = new PasswordsRequestDialog();
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d.Application = exepath;
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switch (d.ShowDialog())
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{
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case DialogResult.OK:
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// Give passwords this time.
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CompleteRequest(destdir, null);
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break;
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case DialogResult.Yes:
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// Give passwords always.
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CompleteRequest(destdir, GenerateToken(exepath, this_user.User.ToString()));
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break;
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case DialogResult.Cancel:
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WriteXML(destdir, null, "cancelled");
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break;
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default:
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log.Error("Unexpected result from PasswordsRequestDialog!");
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return;
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}
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}
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private static bool ParseToken(string destdir, out string token, out string token_exepath, out string user_sid)
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{
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string enc = GetToken(destdir);
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if (enc != null)
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{
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string plain = EncryptionUtils.Unprotect(enc);
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if (plain != null)
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{
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string[] bits = plain.Split(Separator);
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long ticks;
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if (bits.Length == 4 && bits[0] == TokenIdentifier && long.TryParse(bits[1], out ticks))
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{
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token = enc;
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token_exepath = bits[2];
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user_sid = bits[3];
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return true;
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}
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}
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}
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token = null;
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token_exepath = null;
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user_sid = null;
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return false;
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}
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private static string GetToken(string destdir)
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{
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string path = Path.Combine(destdir, RequestFilename);
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if (!File.Exists(path))
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return null;
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try
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{
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XmlDocument doc = new XmlDocument();
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doc.Load(path);
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XmlNamespaceManager nsmgr = new XmlNamespaceManager(doc.NameTable);
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nsmgr.AddNamespace("n", NamespaceURI);
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XmlNode n = doc.SelectSingleNode("/n:" + RootElement + "/n:" + TokenElement, nsmgr);
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return n == null ? null : n.InnerText;
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}
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catch (Exception exn)
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{
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log.Error(exn, exn);
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return null;
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}
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}
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private static string GenerateToken(string exepath, string user_sid)
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{
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string plain = string.Format("{0}{1}{2}{3}{4}{5}{6}", TokenIdentifier, Separator, DateTime.Now.Ticks, Separator, exepath,
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Separator, user_sid);
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return EncryptionUtils.Protect(plain);
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}
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private static void CompleteRequest(string destdir, string token)
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{
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bool restored;
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try
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{
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Settings.RestoreSession();
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restored = Properties.Settings.Default.SaveSession;
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}
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catch (ConfigurationErrorsException ex)
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{
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log.Error("Could not load settings.", ex);
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new ThreeButtonDialog(
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new ThreeButtonDialog.Details(
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SystemIcons.Error,
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string.Format(Messages.MESSAGEBOX_LOAD_CORRUPTED, Settings.GetUserConfigPath()),
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Messages.MESSAGEBOX_LOAD_CORRUPTED_TITLE)).ShowDialog(Program.MainWindow);
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Application.Exit();
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return;
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}
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try
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{
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if (restored)
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{
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WriteXML(destdir, token, null);
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}
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else
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{
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// The user has cancelled the restore.
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WriteXML(destdir, null, "cancelled");
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}
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}
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catch (Exception exn)
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{
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new ThreeButtonDialog(
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new ThreeButtonDialog.Details(
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SystemIcons.Error,
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string.Format(Messages.MESSAGEBOX_PASSWORD_WRITE_FAILED, exn.Message),
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Messages.XENCENTER)).ShowDialog(Program.MainWindow);
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Application.Exit();
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}
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}
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private static void WriteXML(string destdir, string token, string error)
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{
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XmlDocument doc = new XmlDocument();
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doc.AppendChild(doc.CreateXmlDeclaration("1.0", null, null));
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XmlElement root = doc.CreateElement(RootElement, NamespaceURI);
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root.SetAttribute("version", "1.0");
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doc.AppendChild(root);
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if (error != null)
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{
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XmlElement error_node = doc.CreateElement("error", NamespaceURI);
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root.AppendChild(error_node);
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error_node.SetAttribute("code", error);
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}
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else
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{
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if (token != null)
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{
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XmlElement token_node = doc.CreateElement(TokenElement, NamespaceURI);
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root.AppendChild(token_node);
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token_node.AppendChild(doc.CreateTextNode(token));
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}
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foreach (IXenConnection conn in ConnectionsManager.XenConnectionsCopy)
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{
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XenConnection connection = conn as XenConnection;
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XmlElement pool_node = doc.CreateElement("pool", NamespaceURI);
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root.AppendChild(pool_node);
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pool_node.SetAttribute("name_label", conn.FriendlyName);
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pool_node.SetAttribute("password", conn.Password);
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pool_node.SetAttribute("is_connected", conn.SaveDisconnected ? "false" : "true");
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lock (connection.PoolMembersLock)
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{
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pool_node.AppendChild(ServerNode(doc, conn.Hostname, conn.Port, true));
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foreach (string member in conn.PoolMembers)
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{
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if (member != conn.Hostname)
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pool_node.AppendChild(ServerNode(doc, member, conn.Port, false));
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}
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}
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}
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}
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XmlWriterSettings settings = new XmlWriterSettings();
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settings.CloseOutput = true;
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settings.Indent = true;
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settings.Encoding = Encoding.UTF8;
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string dest = Path.Combine(destdir, ResultFilename);
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XmlWriter writer = XmlWriter.Create(dest, settings);
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try
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{
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doc.WriteContentTo(writer);
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}
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finally
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{
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writer.Close();
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}
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}
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private static XmlElement ServerNode(XmlDocument doc, string address, int port, bool is_master)
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{
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XmlElement server_node = doc.CreateElement("server", NamespaceURI);
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server_node.SetAttribute("address", address);
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server_node.SetAttribute("port", port.ToString());
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server_node.SetAttribute("is_master", is_master ? "true" : "false");
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return server_node;
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}
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}
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}
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