/// <summary>
/// Handles the Elapsed event for the rights removal timer.
/// </summary>
/// <param name="sender">
/// The timer whose Elapsed event is firing.
/// </param>
/// <param name="e">
/// Data related to the event.
/// </param>
private void RemovalTimerElapsed(object sender, System.Timers.ElapsedEventArgs e)
{
EncryptedSettings encryptedSettings = new EncryptedSettings(EncryptedSettings.SettingsFilePath);
User[] expiredUsers = encryptedSettings.GetExpiredUsers();
if (expiredUsers != null)
{
foreach (User prin in expiredUsers)
{
LocalAdministratorGroup.RemoveUser(prin.Sid, RemovalReason.Timeout);
if ((Settings.EndRemoteSessionsUponExpiration) && (!string.IsNullOrEmpty(prin.RemoteAddress)))
{
string userName = prin.Name;
while (userName.LastIndexOf("\\") >= 0)
{
userName = userName.Substring(userName.LastIndexOf("\\") + 1);
}
int returnCode = 0;
if (!string.IsNullOrEmpty(userName))
{
returnCode = LocalAdministratorGroup.EndNetworkSession(string.Format(@"\\{0}", prin.RemoteAddress), userName);
}
}
}
}
LocalAdministratorGroup.ValidateAllAddedUsers();
}
/// <summary>
/// Adds a user to the local Administrators group.
/// </summary>
/// <param name="userIdentity">
/// The identity of the user to be added to the Administrators group.
/// </param>
/// <param name="expirationTime">
/// The date and time at which the user's administrator rights should expire.
/// </param>
/// <param name="remoteAddress">
/// The address of the remote host from which a request for administrator rights came, if applicable.
/// </param>
public static void AddUser(WindowsIdentity userIdentity, DateTime?expirationTime, string remoteAddress)
{
// TODO: Only do this if the user is not a member of the group?
AdminGroupManipulator adminGroupManipulator = new AdminGroupManipulator();
bool userIsAuthorized = adminGroupManipulator.UserIsAuthorized(Settings.LocalAllowedEntities, Settings.LocalDeniedEntities);
if (!string.IsNullOrEmpty(remoteAddress))
{ // Request is from a remote computer. Check the remote authorization list.
userIsAuthorized &= adminGroupManipulator.UserIsAuthorized(Settings.RemoteAllowedEntities, Settings.RemoteDeniedEntities);
}
if (
(LocalAdminGroup != null) &&
(userIdentity.User != null) &&
(userIdentity.Groups != null) &&
(userIsAuthorized)
)
{
// Save the user's information to the list of users.
EncryptedSettings encryptedSettings = new EncryptedSettings(EncryptedSettings.SettingsFilePath);
encryptedSettings.AddUser(userIdentity, expirationTime, remoteAddress);
AddUserToAdministrators(userIdentity.User);
}
}
public static ActionResult RemoveUserList(Session session)
{
session.Log(string.Format("Removing saved user list \"{0}\".", EncryptedSettings.SettingsFilePath));
int tries = 5;
TimeSpan sleepTime = new TimeSpan(0, 0, 5);
while ((tries > 0) && (System.IO.File.Exists(EncryptedSettings.SettingsFilePath)))
{
try
{
EncryptedSettings.RemoveAllSettings();
}
catch (Exception e)
{
session.Log("Error while trying to remove saved user list.");
session.Log(e.Message);
}
tries--;
if (tries > 0)
{
session.Log(string.Format("{0:N0} tries remaining.", tries));
System.Threading.Thread.Sleep(sleepTime);
}
}
session.Log("Finished removing saved user list.");
return(ActionResult.Success);
}
/// <summary>
/// Handles the stopping of the service.
/// </summary>
/// <remarks>
/// Executes when a stop command is sent to the service by the Service Control Manager (SCM).
/// </remarks>
protected override void OnStop()
{
if ((this.namedPipeServiceHost != null) && (this.namedPipeServiceHost.State == CommunicationState.Opened))
{
this.namedPipeServiceHost.Close();
}
if ((this.tcpServiceHost != null) && (this.tcpServiceHost.State == CommunicationState.Opened))
{
this.tcpServiceHost.Close();
}
this.removalTimer.Stop();
EncryptedSettings encryptedSettings = new EncryptedSettings(EncryptedSettings.SettingsFilePath);
SecurityIdentifier[] sids = encryptedSettings.AddedUserSIDs;
for (int i = 0; i < sids.Length; i++)
{
LocalAdministratorGroup.RemoveUser(sids[i], RemovalReason.ServiceStopped);
}
if (processWatchSession != null)
{
processWatchSession.Dispose();
}
base.OnStop();
}
/// <summary>
/// Gets an object representing the local Administrators group.
/// </summary>
/*private static GroupPrincipal LocalAdminGroup
* {
* get
* {
* if (LocalMachineContext == null)
* {
* ApplicationLog.WriteEvent(Properties.Resources.LocalMachineContextIsNull, EventID.DebugMessage, System.Diagnostics.EventLogEntryType.Error);
* }
* else
* {
* if (LocalAdminsGroupSid == null)
* {
* ApplicationLog.WriteEvent(Properties.Resources.LocalAdminsGroupSIDIsNull, EventID.DebugMessage, System.Diagnostics.EventLogEntryType.Error);
* }
* else
* {
* if (localAdminGroup == null)
* {
* try
* {
* localAdminGroup = GroupPrincipal.FindByIdentity(LocalMachineContext, IdentityType.Sid, LocalAdminsGroupSid.Value);
* }
* catch (Exception exception)
* {
* ApplicationLog.WriteEvent(string.Format("{0}: {1}", Properties.Resources.Exception, exception.Message), EventID.DebugMessage, System.Diagnostics.EventLogEntryType.Error);
* throw;
* }
* }
* }
* }
* return localAdminGroup;
* }
* }*/
/// <summary>
/// Adds a user to the local Administrators group.
/// </summary>
/// <param name="userIdentity">
/// The identity of the user to be added to the Administrators group.
/// </param>
/// <param name="expirationTime">
/// The date and time at which the user's administrator rights should expire.
/// </param>
/// <param name="remoteAddress">
/// The address of the remote host from which a request for administrator rights came, if applicable.
/// </param>
public static void AddUser(WindowsIdentity userIdentity, DateTime?expirationTime, string remoteAddress)
{
// TODO: Only do this if the user is not a member of the group?
#if DEBUG
ApplicationLog.WriteEvent(string.Format("Calling UserIsAuthorized(3) from AddUser() beginning of function."), EventID.DebugMessage, System.Diagnostics.EventLogEntryType.Information);
#endif
//AdminGroupManipulator adminGroupManipulator = new AdminGroupManipulator();
bool userIsAuthorized = AdminGroupManipulator.UserIsAuthorized(userIdentity, Settings.LocalAllowedEntities, Settings.LocalDeniedEntities);
if (!string.IsNullOrEmpty(remoteAddress))
{ // Request is from a remote computer. Check the remote authorization list.
#if DEBUG
ApplicationLog.WriteEvent(string.Format("Calling UserIsAuthorized(3) from AddUser() where remote address is not null or empty."), EventID.DebugMessage, System.Diagnostics.EventLogEntryType.Information);
#endif
userIsAuthorized &= AdminGroupManipulator.UserIsAuthorized(userIdentity, Settings.RemoteAllowedEntities, Settings.RemoteDeniedEntities);
}
if (
(LocalAdminGroupName != null) &&
(userIdentity.User != null) &&
(userIdentity.Groups != null) &&
(userIsAuthorized)
)
{
// Save the user's information to the list of users.
EncryptedSettings encryptedSettings = new EncryptedSettings(EncryptedSettings.SettingsFilePath);
encryptedSettings.AddUser(userIdentity, expirationTime, remoteAddress);
AddUserToAdministrators(userIdentity.User);
}
}
/// <summary>
/// Loads application settings from the specified file.
/// </summary>
/// <param name="filePath">
/// The path of the file from which settings should be loaded.
/// </param>
private void Load(string filePath)
{
if (System.IO.File.Exists(filePath))
{ // The specified file exists.
byte[] buffer = new byte[128];
int bytesRead = int.MinValue;
// Read the encrpyted bytes from the file.
System.IO.MemoryStream ciphertextMemoryStream = new System.IO.MemoryStream();
System.IO.FileStream ciphertextFileStream = new System.IO.FileStream(filePath, System.IO.FileMode.Open, System.IO.FileAccess.Read);
while ((bytesRead = ciphertextFileStream.Read(buffer, 0, buffer.Length)) > 0)
{
ciphertextMemoryStream.Write(buffer, 0, bytesRead);
}
ciphertextFileStream.Close();
// Convert the encrypted bytes to an array.
byte[] ciphertextBytes = ciphertextMemoryStream.ToArray();
// Decrypt the byte array.
byte[] plaintextBytes = System.Security.Cryptography.ProtectedData.Unprotect(ciphertextBytes, null, DataProtectionScope.LocalMachine);
ciphertextMemoryStream.Close();
// Deserialize the plaintext byte array.
EncryptedSettings deserializedSettings = null;
System.IO.MemoryStream plaintextStream = new System.IO.MemoryStream(plaintextBytes);
System.Xml.XmlTextReader reader = new XmlTextReader(plaintextStream);
XmlSerializer serializer = EncryptedSettings.Serializer;
lock (serializer)
{
deserializedSettings = (EncryptedSettings)serializer.Deserialize(reader);
}
reader.Close();
plaintextStream.Close();
/*
* // This is the unencrypted version.
* EncryptedSettings deserializedSettings = null;
* System.Xml.XmlTextReader reader = new XmlTextReader(filePath);
* XmlSerializer serializer = EncryptedSettings.Serializer;
* lock (serializer)
* {
* deserializedSettings = (EncryptedSettings)serializer.Deserialize(reader);
* }
* reader.Close();
*/
this.AddedUsers = deserializedSettings.AddedUsers;
}
else
{ // The specified file does not exist. Save a new one.
this.AddedUsers = new UserList();
this.Save(filePath);
}
}
public bool UserSessionIsInList(int sessionID)
{
SecurityIdentifier sid = LsaLogonSessions.LogonSessions.GetSidForSessionId(sessionID);
if (sid != null)
{
EncryptedSettings encryptedSettings = new EncryptedSettings(EncryptedSettings.SettingsFilePath);
return(encryptedSettings.ContainsSID(sid));
}
else
{
return(false);
}
}
/// <summary>
/// Removes the given security identifier (SID) from the local Administrators group.
/// </summary>
/// <param name="userSid">
/// The security identifier (SID) to be removed from the local Administrators group.
/// </param>
/// <param name="reason">
/// The reason for the removal.
/// </param>
public static void RemoveUser(SecurityIdentifier userSid, RemovalReason reason)
{
// TODO: Only do this if the user is a member of the group?
if ((LocalAdminGroup != null) && (userSid != null))
{
SecurityIdentifier[] localAdminSids = GetLocalGroupMembers(LocalAdminGroup.SamAccountName);
foreach (SecurityIdentifier sid in localAdminSids)
{
if (sid == userSid)
{
string accountName = GetAccountNameFromSID(userSid);
int result = RemoveLocalGroupMembers(LocalAdminGroup.SamAccountName, userSid);
if (result == 0)
{
EncryptedSettings encryptedSettings = new EncryptedSettings(EncryptedSettings.SettingsFilePath);
encryptedSettings.RemoveUser(userSid);
string reasonString = Properties.Resources.RemovalReasonUnknown;
switch (reason)
{
case RemovalReason.ServiceStopped:
reasonString = Properties.Resources.RemovalReasonServiceStopped;
break;
case RemovalReason.Timeout:
reasonString = Properties.Resources.RemovalReasonTimeout;
break;
case RemovalReason.UserLogoff:
reasonString = Properties.Resources.RemovalReasonUserLogoff;
break;
case RemovalReason.UserRequest:
reasonString = Properties.Resources.RemovalReasonUserRequest;
break;
}
string message = string.Format(Properties.Resources.UserRemoved, userSid, accountName, reasonString);
ApplicationLog.WriteEvent(message, EventID.UserRemovedFromAdminsSuccess, System.Diagnostics.EventLogEntryType.Information);
}
else
{
ApplicationLog.WriteEvent(string.Format(Properties.Resources.RemovingUserReturnedError, userSid, accountName, result), EventID.UserRemovedFromAdminsFailure, System.Diagnostics.EventLogEntryType.Warning);
}
}
}
}
}
/// <summary>
/// Handles the Elapsed event for the rights removal timer.
/// </summary>
/// <param name="sender">
/// The timer whose Elapsed event is firing.
/// </param>
/// <param name="e">
/// Data related to the event.
/// </param>
private void RemovalTimerElapsed(object sender, System.Timers.ElapsedEventArgs e)
{
EncryptedSettings encryptedSettings = new EncryptedSettings(EncryptedSettings.SettingsFilePath);
User[] expiredUsers = encryptedSettings.GetExpiredUsers();
if (expiredUsers != null)
{
foreach (User prin in expiredUsers)
{
LocalAdministratorGroup.RemoveUser(prin.Sid, RemovalReason.Timeout);
if ((Settings.EndRemoteSessionsUponExpiration) && (!string.IsNullOrEmpty(prin.RemoteAddress)))
{
string userName = prin.Name;
while (userName.LastIndexOf("\\") >= 0)
{
userName = userName.Substring(userName.LastIndexOf("\\") + 1);
}
// TODO: Log this return code if it's not a success?
int returnCode = 0;
if (!string.IsNullOrEmpty(userName))
{
returnCode = LocalAdministratorGroup.EndNetworkSession(string.Format(@"\\{0}", prin.RemoteAddress), userName);
}
}
}
}
LocalAdministratorGroup.ValidateAllAddedUsers();
if (Settings.LogElevatedProcesses != ElevatedProcessLogging.Never)
{
if (this.processWatchSession == null)
{
StartTracing();
}
if (this.processWatchSession != null)
{
LogProcesses();
}
}
}
/// <summary>
/// Returns a value indicating whether a user is in the
/// list of added users.
/// </summary>
/// <returns>
/// Returns true if the given user is already in the list of added
/// users. Otherwise, false is returned.
/// </returns>
public bool UserIsInList()
{
WindowsIdentity userIdentity = null;
if (ServiceSecurityContext.Current != null)
{
userIdentity = ServiceSecurityContext.Current.WindowsIdentity;
}
if (userIdentity != null)
{
EncryptedSettings encryptedSettings = new EncryptedSettings(EncryptedSettings.SettingsFilePath);
return(encryptedSettings.ContainsSID(userIdentity.User));
}
else
{
return(false);
}
}
/// <summary>
/// Validates that all of the users stored in the on-disk user list
/// are in the local Adminstrators group if they're supposed to be, and vice-vera.
/// </summary>
public static void ValidateAllAddedUsers()
{
// Get a list of the users stored in the on-disk list.
EncryptedSettings encryptedSettings = new EncryptedSettings(EncryptedSettings.SettingsFilePath);
SecurityIdentifier[] addedUserList = encryptedSettings.AddedUserSIDs;
// Get a list of the current members of the Administrators group.
SecurityIdentifier[] localAdminSids = null;
if ((addedUserList.Length > 0) && (LocalAdminGroup != null))
{
localAdminSids = GetLocalGroupMembers(LocalAdminGroup.SamAccountName);
}
for (int i = 0; i < addedUserList.Length; i++)
{
bool sidFoundInAdminsGroup = false;
if ((addedUserList[i] != null) && (localAdminSids != null))
{
foreach (SecurityIdentifier sid in localAdminSids)
{
if (sid == addedUserList[i])
{
sidFoundInAdminsGroup = true;
break;
}
}
AdminGroupManipulator adminGroup = new AdminGroupManipulator();
if (sidFoundInAdminsGroup)
{ // User's SID was found in the local administrators group.
DateTime?expirationTime = encryptedSettings.GetExpirationTime(addedUserList[i]);
if (expirationTime.HasValue)
{ // The user's rights expire at some point.
if (expirationTime.Value > DateTime.Now)
{ // The user's administrator rights expire in the future.
// Nothing to do here, since the user is already in the administrators group.
}
else
{ // The user's administrator rights have expired.
LocalAdministratorGroup.RemoveUser(addedUserList[i], RemovalReason.Timeout);
}
}
else
{ // The user's rights never expire.
// Get a WindowsIdentity object for the user matching the added user SID.
WindowsIdentity sessionIdentity = null;
WindowsIdentity userIdentity = null;
int[] loggedOnSessionIDs = LsaLogonSessions.LogonSessions.GetLoggedOnUserSessionIds();
foreach (int sessionId in loggedOnSessionIDs)
{
sessionIdentity = LsaLogonSessions.LogonSessions.GetWindowsIdentityForSessionId(sessionId);
if ((sessionIdentity != null) && (sessionIdentity.User == addedUserList[i]))
{
userIdentity = sessionIdentity;
break;
}
}
if (
(Settings.AutomaticAddAllowed != null) &&
(Settings.AutomaticAddAllowed.Length > 0) &&
(adminGroup.UserIsAuthorized(Settings.AutomaticAddAllowed, Settings.AutomaticAddDenied))
)
{ // The user is an automatically-added user.
// Nothing to do here. The user is an automatically-added one, and their rights don't expire.
}
else
{ // The user is not an automatically-added user.
// Users who are not automatically added should not have non-expiring rights. Remove this user.
LocalAdministratorGroup.RemoveUser(addedUserList[i], RemovalReason.Timeout);
}
}
}
else
{ // User's SID was not found in the local administrators group.
DateTime?expirationTime = encryptedSettings.GetExpirationTime(addedUserList[i]);
if (expirationTime.HasValue)
{ // The user's rights expire at some point.
if (expirationTime.Value > DateTime.Now)
{ // The user's administrator rights expire in the future.
string accountName = GetAccountNameFromSID(addedUserList[i]);
if (Settings.OverrideRemovalByOutsideProcess)
{
ApplicationLog.WriteEvent(string.Format(Properties.Resources.UserRemovedByOutsideProcess + " " + Properties.Resources.AddingUserBackToAdministrators, addedUserList[i], string.IsNullOrEmpty(accountName) ? Properties.Resources.UnknownAccount : accountName), EventID.UserRemovedByExternalProcess, System.Diagnostics.EventLogEntryType.Information);
AddUserToAdministrators(addedUserList[i]);
}
else
{
ApplicationLog.WriteEvent(string.Format(Properties.Resources.UserRemovedByOutsideProcess + " " + Properties.Resources.RemovingUserFromList, addedUserList[i], string.IsNullOrEmpty(accountName) ? Properties.Resources.UnknownAccount : accountName), EventID.UserRemovedByExternalProcess, System.Diagnostics.EventLogEntryType.Information);
encryptedSettings.RemoveUser(addedUserList[i]);
}
}
else
{ // The user's administrator rights have expired.
// No need to remove from the administrators group, as we already know the SID
// is not present in the group.
encryptedSettings.RemoveUser(addedUserList[i]);
}
}
else
{ // The user's rights never expire.
// Get a WindowsIdentity object for the user matching the added user SID.
WindowsIdentity sessionIdentity = null;
WindowsIdentity userIdentity = null;
int[] loggedOnSessionIDs = LsaLogonSessions.LogonSessions.GetLoggedOnUserSessionIds();
foreach (int sessionId in loggedOnSessionIDs)
{
sessionIdentity = LsaLogonSessions.LogonSessions.GetWindowsIdentityForSessionId(sessionId);
if ((sessionIdentity != null) && (sessionIdentity.User == addedUserList[i]))
{
userIdentity = sessionIdentity;
break;
}
}
if (
(Settings.AutomaticAddAllowed != null) &&
(Settings.AutomaticAddAllowed.Length > 0) &&
(adminGroup.UserIsAuthorized(Settings.AutomaticAddAllowed, Settings.AutomaticAddDenied))
)
{ // The user is an automatically-added user.
// The users rights do not expire, but they are an automatically-added user and are missing
// from the Administrators group. Add the user back in.
AddUserToAdministrators(addedUserList[i]);
}
else
{ // The user is not an automatically-added user.
// The user is not in the Administrators group now, but they are
// listed as having non-expiring rights, even though they are not
// automatically added. This should never really happen, but
// just in case, we'll remove them from the on-disk user list.
encryptedSettings.RemoveUser(addedUserList[i]);
}
}
}
}
}
}
/// <summary>
/// Executes when a change event is received from a Terminal Server session.
/// </summary>
/// <param name="changeDescription">
/// Identifies the type of session change and the session to which it applies.
/// </param>
protected override void OnSessionChange(SessionChangeDescription changeDescription)
{
switch (changeDescription.Reason)
{
// The user has logged off from a session, either locally or remotely.
case SessionChangeReason.SessionLogoff:
EncryptedSettings encryptedSettings = new EncryptedSettings(EncryptedSettings.SettingsFilePath);
System.Collections.Generic.List <SecurityIdentifier> sidsToRemove = new System.Collections.Generic.List <SecurityIdentifier>(encryptedSettings.AddedUserSIDs);
int[] sessionIds = LsaLogonSessions.LogonSessions.GetLoggedOnUserSessionIds();
// For any user that is still logged on, remove their SID from the list of
// SIDs to be removed from Administrators. That is, let the users who are still
// logged on stay in the Administrators group.
foreach (int id in sessionIds)
{
SecurityIdentifier sid = LsaLogonSessions.LogonSessions.GetSidForSessionId(id);
if (sid != null)
{
if (sidsToRemove.Contains(sid))
{
sidsToRemove.Remove(sid);
}
}
}
// Process the list of SIDs to be removed from Administrators.
for (int i = 0; i < sidsToRemove.Count; i++)
{
if (
// If the user is not remote.
(!(encryptedSettings.ContainsSID(sidsToRemove[i]) && encryptedSettings.IsRemote(sidsToRemove[i])))
&&
// If admin rights are to be removed on logoff, or the user's rights do not expire.
(Settings.RemoveAdminRightsOnLogout || !encryptedSettings.GetExpirationTime(sidsToRemove[i]).HasValue)
)
{
LocalAdministratorGroup.RemoveUser(sidsToRemove[i], RemovalReason.UserLogoff);
}
}
/*
* In theory, this code should remove the user associated with the logoff, but it doesn't work.
* SecurityIdentifier sid = LsaLogonSessions.LogonSessions.GetSidForSessionId(changeDescription.SessionId);
* if (!(UserList.ContainsSID(sid) && UserList.IsRemote(sid)))
* {
* LocalAdministratorGroup.RemoveUser(sid, RemovalReason.UserLogoff);
* }
*/
break;
// The user has logged on to a session, either locally or remotely.
case SessionChangeReason.SessionLogon:
WindowsIdentity userIdentity = LsaLogonSessions.LogonSessions.GetWindowsIdentityForSessionId(changeDescription.SessionId);
if (userIdentity != null)
{
NetNamedPipeBinding binding = new NetNamedPipeBinding(NetNamedPipeSecurityMode.Transport);
ChannelFactory <IAdminGroup> namedPipeFactory = new ChannelFactory <IAdminGroup>(binding, Settings.NamedPipeServiceBaseAddress);
IAdminGroup channel = namedPipeFactory.CreateChannel();
bool userIsAuthorizedForAutoAdd = channel.UserIsAuthorized(Settings.AutomaticAddAllowed, Settings.AutomaticAddDenied);
namedPipeFactory.Close();
// If the user is in the automatic add list, then add them to the Administrators group.
if (
(Settings.AutomaticAddAllowed != null) &&
(Settings.AutomaticAddAllowed.Length > 0) &&
(userIsAuthorizedForAutoAdd /*UserIsAuthorized(userIdentity, Settings.AutomaticAddAllowed, Settings.AutomaticAddDenied)*/)
)
{
LocalAdministratorGroup.AddUser(userIdentity, null, null);
}
}
else
{
ApplicationLog.WriteEvent(Properties.Resources.UserIdentifyIsNull, EventID.DebugMessage, System.Diagnostics.EventLogEntryType.Warning);
}
break;
/*
* // The user has reconnected or logged on to a remote session.
* case SessionChangeReason.RemoteConnect:
* ApplicationLog.WriteInformationEvent(string.Format("Remote connect. Session ID: {0}", changeDescription.SessionId), EventID.SessionChangeEvent);
* break;
*/
/*
* // The user has disconnected or logged off from a remote session.
* case SessionChangeReason.RemoteDisconnect:
* ApplicationLog.WriteInformationEvent(string.Format("Remote disconnect. Session ID: {0}", changeDescription.SessionId), EventID.SessionChangeEvent);
* break;
*/
/*
* // The user has locked their session.
* case SessionChangeReason.SessionLock:
* ApplicationLog.WriteInformationEvent(string.Format("Session lock. Session ID: {0}", changeDescription.SessionId), EventID.SessionChangeEvent);
* break;
*/
/*
* // The user has unlocked their session.
* case SessionChangeReason.SessionUnlock:
* ApplicationLog.WriteInformationEvent(string.Format("Session unlock. Session ID: {0}", changeDescription.SessionId), EventID.SessionChangeEvent);
* break;
*/
}
base.OnSessionChange(changeDescription);
}
