/// <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);
}
}
/// <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>
/// 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:
#if DEBUG
ApplicationLog.WriteEvent(string.Format("In OnSessionChange(), the SessionLogon case. The session logging on is session #{0}.", changeDescription.SessionId), EventID.DebugMessage, System.Diagnostics.EventLogEntryType.Information);
#endif
WindowsIdentity userIdentity = LsaLogonSessions.LogonSessions.GetWindowsIdentityForSessionId(changeDescription.SessionId);
#if DEBUG
if (null != userIdentity)
{
ApplicationLog.WriteEvent(string.Format(string.Format("User Identity is \"{0}.\"", userIdentity.Name)), EventID.DebugMessage, System.Diagnostics.EventLogEntryType.Information);
}
#endif
if (null != userIdentity)
{
#if DEBUG
ApplicationLog.WriteEvent(string.Format("Calling UserIsAuthorized(3) from Service's OnSessionChange event."), EventID.DebugMessage, System.Diagnostics.EventLogEntryType.Information);
#endif
bool userIsAuthorizedForAutoAdd = AdminGroupManipulator.UserIsAuthorized(userIdentity, Settings.AutomaticAddAllowed, Settings.AutomaticAddDenied);
/*
* 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)
)
{
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);
}
