/// <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);
}
/*
* private bool TcpPortInUse
* {
* get
* {
* System.Net.NetworkInformation.IPGlobalProperties globalIPProps = System.Net.NetworkInformation.IPGlobalProperties.GetIPGlobalProperties();
* return globalIPProps.GetActiveTcpListeners().Where(n => n.Port == Settings.TCPServicePort).Count() > 0;
* }
* }
*/
/// <summary>
/// Handles the faulted event for a WCF service host.
/// </summary>
/// <param name="sender">
/// The service host that has entered the faulted state.
/// </param>
/// <param name="e">
/// Data related to the event.
/// </param>
private void ServiceHostFaulted(object sender, EventArgs e)
{
ApplicationLog.WriteEvent(Properties.Resources.ServiceHostFaulted, EventID.DebugMessage, System.Diagnostics.EventLogEntryType.Warning);
}
/// <summary>
/// Validates that all of the users stored in the on-disk user list
/// are in the local Administrators group if they're supposed to be, and vice-versa.
/// </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) && (LocalAdminGroupName != null))
{
localAdminSids = GetLocalGroupMembers(LocalAdminGroupName);
}
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>
/// Creates the WCF Service Host which is accessible via TCP.
/// </summary>
private void OpenTcpServiceHost()
{
if ((null != this.tcpServiceHost) && (this.tcpServiceHost.State == CommunicationState.Opened))
{
this.tcpServiceHost.Close();
}
this.tcpServiceHost = new ServiceHost(typeof(AdminGroupManipulator), new Uri(Settings.TcpServiceBaseAddress));
this.tcpServiceHost.Faulted += ServiceHostFaulted;
NetTcpBinding binding = new NetTcpBinding(SecurityMode.Transport)
{
PortSharingEnabled = true
};
// If port sharing is enabled, then the Net.Tcp Port Sharing Service must be available as well.
if (PortSharingServiceExists)
{
ServiceController controller = new ServiceController(portSharingServiceName);
switch (controller.StartType)
{
case ServiceStartMode.Disabled:
ApplicationLog.WriteEvent("The Net.Tcp Port Sharing Service is disabled. Remote access will not be available.", EventID.RemoteAccessFailure, System.Diagnostics.EventLogEntryType.Warning);
return;
/*
* case ServiceStartMode.Automatic:
#if DEBUG
* ApplicationLog.WriteEvent("Port sharing service is set to start automatically.", EventID.DebugMessage, System.Diagnostics.EventLogEntryType.Information);
#endif
* break;
* case ServiceStartMode.Manual:
#if DEBUG
* ApplicationLog.WriteEvent("Port sharing service is set to start manually.", EventID.DebugMessage, System.Diagnostics.EventLogEntryType.Information);
#endif
* int waitCount = 0;
* while ((controller.Status != ServiceControllerStatus.Running) && (waitCount < 10))
* {
* switch (controller.Status)
* {
* case ServiceControllerStatus.Paused:
* controller.Continue();
* controller.WaitForStatus(ServiceControllerStatus.Running, new TimeSpan(0, 0, 5));
* break;
* case ServiceControllerStatus.Stopped:
* try
* {
* controller.Start();
* controller.WaitForStatus(ServiceControllerStatus.Running, new TimeSpan(0, 0, 5));
* }
* catch (Win32Exception win32Exception)
* {
* ApplicationLog.WriteEvent(win32Exception.Message, EventID.RemoteAccessFailure, System.Diagnostics.EventLogEntryType.Error);
* }
* catch (InvalidOperationException invalidOpException)
* {
* ApplicationLog.WriteEvent(invalidOpException.Message, EventID.RemoteAccessFailure, System.Diagnostics.EventLogEntryType.Error);
* }
* break;
* }
* System.Threading.Thread.Sleep(1000);
* waitCount++;
* }
*
* if (controller.Status != ServiceControllerStatus.Running)
* {
* ApplicationLog.WriteEvent(string.Format("Port {0} is already in use, but the Net.Tcp Port Sharing Service is not running. Remote access will not be available.", Settings.TCPServicePort), EventID.RemoteAccessFailure, System.Diagnostics.EventLogEntryType.Warning);
* }
*
* break;
*/
}
controller.Close();
}
else
{
ApplicationLog.WriteEvent(string.Format("Port {0} is already in use, but the Net.Tcp Port Sharing Service does not exist. Remote access will not be available.", Settings.TCPServicePort), EventID.RemoteAccessFailure, System.Diagnostics.EventLogEntryType.Warning);
return;
}
this.tcpServiceHost.AddServiceEndpoint(typeof(IAdminGroup), binding, Settings.TcpServiceBaseAddress);
try
{
this.tcpServiceHost.Open();
}
catch (ObjectDisposedException)
{
ApplicationLog.WriteEvent("The communication object is in a Closing or Closed state and cannot be modified.", EventID.RemoteAccessFailure, System.Diagnostics.EventLogEntryType.Warning);
}
catch (InvalidOperationException)
{
ApplicationLog.WriteEvent("The communication object is not in a Opened or Opening state and cannot be modified.", EventID.RemoteAccessFailure, System.Diagnostics.EventLogEntryType.Warning);
}
catch (CommunicationObjectFaultedException)
{
ApplicationLog.WriteEvent("The communication object is in a Faulted state and cannot be modified.", EventID.RemoteAccessFailure, System.Diagnostics.EventLogEntryType.Warning);
}
catch (System.TimeoutException)
{
ApplicationLog.WriteEvent("The default interval of time that was allotted for the operation was exceeded before the operation was completed.", EventID.RemoteAccessFailure, System.Diagnostics.EventLogEntryType.Warning);
}
}
public static void ValidateAllAddedPrincipals()
{
SecurityIdentifier[] localAdminSids = null;
/* string[] addedSids = PrincipalList.GetSIDs(); */
SecurityIdentifier[] addedSids = PrincipalList.GetSIDs();
if ((addedSids.Length > 0) && (LocalAdminGroup != null))
{
localAdminSids = GetLocalGroupMembers(null, LocalAdminGroup.SamAccountName);
}
for (int i = 0; i < addedSids.Length; i++)
{
bool sidFoundInAdminsGroup = false;
if ((addedSids[i] != null) && (localAdminSids != null))
{
foreach (SecurityIdentifier sid in localAdminSids)
{
if (sid == addedSids[i])
{
sidFoundInAdminsGroup = true;
break;
}
}
if (sidFoundInAdminsGroup)
{ // Principal's SID was found in the local administrators group.
if (PrincipalList.GetExpirationTime(addedSids[i]).HasValue)
{ // The principal's rights expire at some point.
if (PrincipalList.GetExpirationTime(addedSids[i]).Value > DateTime.Now)
{ // The principal's administrator rights expire in the future.
// Nothing to do here, since the principal is already in the administrators group.
}
else
{ // The principal's administrator rights have expired.
#if DEBUG
string accountName = GetAccountNameFromSID(addedSids[i]);
ApplicationLog.WriteInformationEvent(string.Format("Principal {0} ({1}) has been removed from the Administrators group by an outside process. Removing the principal from Make Me Admin's list.", addedSids[i], string.IsNullOrEmpty(accountName) ? "unknown account" : accountName), EventID.DebugMessage);
#endif
LocalAdministratorGroup.RemovePrincipal(addedSids[i], RemovalReason.Timeout);
}
}
// TODO: This should be put back in, but it needs to account for the fact that
// some principals may be added without expiration times.
/*
* else
* { // The principal's rights never expire. This should never happen.
* // Remove the principal from the administrator group.
#if DEBUG
* string accountName = GetAccountNameFromSID(addedSids[i]);
* ApplicationLog.WriteInformationEvent(string.Format("Principal {0} ({1}) has been removed from the Administrators group by an outside process. Removing the principal from Make Me Admin's list.", addedSids[i], string.IsNullOrEmpty(accountName) ? "unknown account" : accountName), EventID.DebugMessage);
#endif
* LocalAdministratorGroup.RemovePrincipal(addedSids[i], RemovalReason.Timeout);
*
* if (
* (Settings.AutomaticAddAllowed != null) &&
* (Settings.AutomaticAddAllowed.Length > 0) &&
* (Shared.UserIsAuthorized(userIdentity, Settings.AutomaticAddAllowed, Settings.AutomaticAddDenied))
* )
* {
#if DEBUG
* ApplicationLog.WriteInformationEvent("User is allowed to be automatically added!", EventID.DebugMessage);
#endif
* LocalAdministratorGroup.AddPrincipal(userIdentity, null, null);
* }
* }
*/
}
else
{ // Principal's SID was not found in the local administrators group.
if (PrincipalList.GetExpirationTime(addedSids[i]).HasValue)
{ // The principal's rights expire at some point.
if (PrincipalList.GetExpirationTime(addedSids[i]).Value > DateTime.Now)
{ // The principal's administrator rights expire in the future.
string accountName = GetAccountNameFromSID(addedSids[i]);
if (Settings.OverrideRemovalByOutsideProcess)
{
// TODO: i18n.
ApplicationLog.WriteInformationEvent(string.Format("Principal {0} ({1}) has been removed from the Administrators group by an outside process. Adding the principal back to the Administrators group.", addedSids[i], string.IsNullOrEmpty(accountName) ? "unknown account" : accountName), EventID.PrincipalRemovedByExternalProcess);
AddPrincipalToAdministrators(addedSids[i], null);
}
else
{
// TODO: i18n.
ApplicationLog.WriteInformationEvent(string.Format("Principal {0} ({1}) has been removed from the Administrators group by an outside process. Removing the principal from Make Me Admin's list.", addedSids[i], string.IsNullOrEmpty(accountName) ? "unknown account" : accountName), EventID.PrincipalRemovedByExternalProcess);
PrincipalList.RemoveSID(addedSids[i]);
Settings.SIDs = PrincipalList.GetSIDs().Select(p => p.Value).ToArray <string>();
}
}
else
{ // The principal'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.
#if DEBUG
ApplicationLog.WriteInformationEvent(string.Format("Removing SID \"{0}\" from the principal list.", addedSids[i]), EventID.DebugMessage);
#endif
PrincipalList.RemoveSID(addedSids[i]);
Settings.SIDs = PrincipalList.GetSIDs().Select(p => p.Value).ToArray <string>();
}
}
/*
* Rights shouldn't need to be removed here, as we already know the SID is not
* a member of the local administrator group.
* else
* { // The principal's rights never expire. This should never happen.
* // Remove the principal from the administrator. group.
* LocalAdministratorGroup.RemovePrincipal(addedSids[i], RemovalReason.Timeout);
* }
*/
}
}
}
}
