/***************************************************************************
 *   Copyright (C) 2012-2013 by Timothy Pearson                            *
 *   kb9vqf@pearsoncomputing.net                                           *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program 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 General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

#include <sys/types.h>
#include <signal.h>

#include <tqlayout.h>

#include <tdelocale.h>
#include <tdeglobal.h>
#include <kcombobox.h>
#include <tdeparts/genericfactory.h>
#include <ksimpleconfig.h>
#include <tdeglobalsettings.h>
#include <kstandarddirs.h>
#include <kurlrequester.h>
#include <tdelistview.h>
#include <kopenwith.h>
#include <kpropertiesdialog.h>
#include <tdeio/job.h>
#include <tqdir.h>
#include <tqheader.h>
#include <knuminput.h>
#include <kpassdlg.h>
#include <klineedit.h>
#include <tdemessagebox.h>

#include <tdesu/process.h>

#include "tdeumaskinput.h"
#include "ldapbonding.h"
#include "bondwizard.h"
#include "ldappasswddlg.h"
#include "realmpropertiesdialog.h"

// FIXME
// Connect this to CMake/Automake
#define KDE_CONFDIR "/etc/trinity"

typedef KGenericFactory<LDAPConfig, TQWidget> ldapFactory;

K_EXPORT_COMPONENT_FACTORY( kcm_ldapbonding, ldapFactory("kcmldapbonding"))

KSimpleConfig *systemconfig = 0;

LDAPConfig::LDAPConfig(TQWidget *parent, const char *name, const TQStringList&)
    : TDECModule(parent, name), myAboutData(0)
{
	TQVBoxLayout *layout = new TQVBoxLayout(this, KDialog::marginHint(), KDialog::spacingHint());
	systemconfig = new KSimpleConfig( TQString::fromLatin1( KDE_CONFDIR "/ldap/ldapconfigrc" ));
	systemconfig->setFileWriteMode(S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);

	TDEAboutData* about = new TDEAboutData("ldap", I18N_NOOP("TDE LDAP Manager"), "0.1",
		I18N_NOOP("TDE LDAP Manager Control Panel Module"),
		TDEAboutData::License_GPL,
		I18N_NOOP("(c) 2012-2013 Timothy Pearson"), 0, 0);
	
	about->addAuthor("Timothy Pearson", 0, "kb9vqf@pearsoncomputing.net");
	setAboutData( about );

	base = new LDAPConfigBase(this);
	layout->add(base);
	base->ldapRealmList->setAllColumnsShowFocus(true);
	base->ldapRealmList->setFullWidth(true);
	
	setRootOnlyMsg(i18n("<b>Bonded LDAP realms take effect system wide, and require administrator access to modify</b><br>To alter the system's bonded LDAP realms, click on the \"Administrator Mode\" button below."));
	setUseRootOnlyMsg(true);

	connect(base->systemEnableSupport, TQT_SIGNAL(clicked()), this, TQT_SLOT(changed()));
	connect(base->defaultRealm, TQT_SIGNAL(activated(int)), this, TQT_SLOT(changed()));
	connect(base->ticketLifetime, TQT_SIGNAL(valueChanged(int)), this, TQT_SLOT(changed()));
	connect(base->systemEnableSupport, TQT_SIGNAL(clicked()), this, TQT_SLOT(processLockouts()));
	connect(base->ldapRealmList, TQT_SIGNAL(selectionChanged()), this, TQT_SLOT(processLockouts()));

	connect(base->btnBondRealm, TQT_SIGNAL(clicked()), this, TQT_SLOT(bondToNewRealm()));
	connect(base->btnReBondRealm, TQT_SIGNAL(clicked()), this, TQT_SLOT(reBondToRealm()));
	connect(base->btnRemoveRealm, TQT_SIGNAL(clicked()), this, TQT_SLOT(removeRealm()));
	connect(base->btnDeactivateRealm, TQT_SIGNAL(clicked()), this, TQT_SLOT(deactivateRealm()));
	connect(base->btnRealmProperties, TQT_SIGNAL(clicked()), this, TQT_SLOT(realmProperties()));

	connect(base->ldapVersion, TQT_SIGNAL(valueChanged(int)), this, TQT_SLOT(changed()));
	connect(base->ldapTimeout, TQT_SIGNAL(valueChanged(int)), this, TQT_SLOT(changed()));
	connect(base->bindPolicy, TQT_SIGNAL(activated(int)), this, TQT_SLOT(changed()));
	connect(base->ldapBindTimeout, TQT_SIGNAL(valueChanged(int)), this, TQT_SLOT(changed()));
	connect(base->passwordHash, TQT_SIGNAL(activated(int)), this, TQT_SLOT(changed()));
	connect(base->ignoredUsers, TQT_SIGNAL(textChanged(const TQString&)), this, TQT_SLOT(changed()));

	connect(base->pamEnableCachedLogons, TQT_SIGNAL(clicked()), this, TQT_SLOT(changed()));
	connect(base->pamCreateHomeDirectory, TQT_SIGNAL(clicked()), this, TQT_SLOT(changed()));
	connect(base->pamCreateHomeDirectory, TQT_SIGNAL(clicked()), this, TQT_SLOT(processLockouts()));
	connect(base->pamCreateHomeDirectoryUmask, TQT_SIGNAL(valueChanged(int)), this, TQT_SLOT(changed()));
	connect(base->pamCreateHomeDirectorySkelDir, TQT_SIGNAL(textChanged(const TQString&)), this, TQT_SLOT(changed()));

	hostFQDN = LDAPManager::getMachineFQDN();
	base->hostFQDN->setEnabled(false);
	base->hostFQDN->clear();
	base->hostFQDN->insertItem(hostFQDN);

	load();

	systemconfig->setGroup(NULL);

	if ((getuid() != 0) || (!systemconfig->checkConfigFilesWritable( true )) || (m_clientRealmConfig.ldapRole != "Workstation")) {
		base->systemEnableSupport->setEnabled(false);
	}

	processLockouts();
};

LDAPConfig::~LDAPConfig() {
	delete systemconfig;
}

void LDAPConfig::load() {
	kgs = new TDEGlobalSettings();

	load(false);
}

void LDAPConfig::load(bool useDefaults )
{
	int i;

	m_clientRealmConfig = LDAPManager::loadClientRealmConfig(systemconfig, useDefaults);

	base->systemEnableSupport->setChecked(m_clientRealmConfig.enable_bonding);
	
	// Load realms
	m_realms.clear();
	m_realms = LDAPManager::readTDERealmList(systemconfig, !m_clientRealmConfig.configurationVerifiedForLocalMachine);

	base->ticketLifetime->setValue(m_clientRealmConfig.ticketLifetime);

	base->ldapVersion->setValue(m_clientRealmConfig.ldapVersion);
	base->ldapTimeout->setValue(m_clientRealmConfig.ldapTimeout);
	for (i=0; i<base->bindPolicy->count(); i++) {
		if (base->bindPolicy->text(i).lower() == m_clientRealmConfig.defaultRealm.lower()) {
			base->bindPolicy->setCurrentItem(i);
			break;
		}
	}
	base->ldapBindTimeout->setValue(m_clientRealmConfig.ldapBindTimeout);
	for (i=0; i<base->passwordHash->count(); i++) {
		if (base->passwordHash->text(i).lower() == m_clientRealmConfig.passwordHash.lower()) {
			base->passwordHash->setCurrentItem(i);
			break;
		}
	}
	base->ignoredUsers->setText(m_clientRealmConfig.ignoredUsers);

	base->pamEnableCachedLogons->setChecked(m_clientRealmConfig.pamConfig.enable_cached_credentials);
	base->pamCreateHomeDirectory->setChecked(m_clientRealmConfig.pamConfig.autocreate_user_directories_enable);
	base->pamCreateHomeDirectoryUmask->setValue(m_clientRealmConfig.pamConfig.autocreate_user_directories_umask);
	base->pamCreateHomeDirectorySkelDir->setURL(m_clientRealmConfig.pamConfig.autocreate_user_directories_skel);

	updateRealmList();

	processLockouts();
	
	emit changed(useDefaults);
}

void LDAPConfig::updateRealmList() {
	base->ldapRealmList->clear();
	base->defaultRealm->clear();
	LDAPRealmConfigList::Iterator it;
	for (it = m_realms.begin(); it != m_realms.end(); ++it) {
		LDAPRealmConfig realmcfg = it.data();
		(void)new TQListViewItem(base->ldapRealmList, ((realmcfg.bonded)?i18n("Bonded"):i18n("Deactivated")), realmcfg.name);
		base->defaultRealm->insertItem(realmcfg.name);
	}
	if (m_clientRealmConfig.defaultRealm != "") {
		for (int i=0; i<base->defaultRealm->count(); i++) {
			if (base->defaultRealm->text(i) == m_clientRealmConfig.defaultRealm) {
				base->defaultRealm->setCurrentItem(i);
				break;
			}
		}
	}
	processLockouts();
}

void LDAPConfig::defaults() {
	
}

void LDAPConfig::save() {
	TQString errorstring;

	m_clientRealmConfig.hostFQDN = hostFQDN;

	m_clientRealmConfig.enable_bonding = base->systemEnableSupport->isChecked();
	m_clientRealmConfig.defaultRealm = base->defaultRealm->currentText();
	m_clientRealmConfig.ticketLifetime = base->ticketLifetime->value();

	m_clientRealmConfig.ldapVersion = base->ldapVersion->value();
	m_clientRealmConfig.ldapTimeout = base->ldapTimeout->value();
	m_clientRealmConfig.bindPolicy = base->bindPolicy->currentText();
	m_clientRealmConfig.ldapBindTimeout = base->ldapBindTimeout->value();
	m_clientRealmConfig.passwordHash = base->passwordHash->currentText();
	m_clientRealmConfig.ignoredUsers = base->ignoredUsers->text();

	m_clientRealmConfig.pamConfig.enable_cached_credentials = base->pamEnableCachedLogons->isChecked();
	m_clientRealmConfig.pamConfig.autocreate_user_directories_enable = base->pamCreateHomeDirectory->isChecked();
	m_clientRealmConfig.pamConfig.autocreate_user_directories_umask = base->pamCreateHomeDirectoryUmask->value();
	m_clientRealmConfig.pamConfig.autocreate_user_directories_skel = base->pamCreateHomeDirectorySkelDir->url();

	// Write system configuration
	if (LDAPManager::saveClientRealmConfig(m_clientRealmConfig, systemconfig, &errorstring) != 0) {
		KMessageBox::error(this, i18n("<qt><b>Unable to save configuration!</b><p>Details: %2</qt>").arg(errorstring), i18n("Unable to Save Configuration"));
		return;
	}

	LDAPManager::writeTDERealmList(m_realms, systemconfig);
	systemconfig->sync();

	if (m_clientRealmConfig.enable_bonding) {
		// Write the Kerberos5 configuration file
		if (LDAPManager::writeClientKrb5ConfFile(m_clientRealmConfig, m_realms, &errorstring) != 0) {
			KMessageBox::error(this, i18n("<qt><b>Unable to save configuration!</b><p>Details: %2</qt>").arg(errorstring), i18n("Unable to Save Configuration"));
			return;
		}
		// Write the LDAP configuration file
		if (LDAPManager::writeLDAPConfFile(m_realms[m_clientRealmConfig.defaultRealm], ROLE_WORKSTATION, &errorstring) != 0) {
			KMessageBox::error(this, i18n("<qt><b>Unable to save configuration!</b><p>Details: %2</qt>").arg(errorstring), i18n("Unable to Save Configuration"));
			return;
		}
		// Write the NSSwitch configuration file
		if (LDAPManager::writeNSSwitchFile(&errorstring) != 0) {
			KMessageBox::error(this, i18n("<qt><b>Unable to save configuration!</b><p>Details: %2</qt>").arg(errorstring), i18n("Unable to Save Configuration"));
			return;
		}
		// Write the PAM configuration files
		if (LDAPManager::writePAMFiles(m_clientRealmConfig.pamConfig, &errorstring) != 0) {
			KMessageBox::error(this, i18n("<qt><b>Unable to save configuration!</b><p>Details: %2</qt>").arg(errorstring), i18n("Unable to Save Configuration"));
			return;
		}
		// Write the cron files
		if (LDAPManager::writeClientCronFiles() != 0) {
			KMessageBox::error(this, i18n("<qt><b>Unable to save configuration!</b><p>Details: %2</qt>").arg(errorstring), i18n("Unable to Save Configuration"));
			return;
		}

		if (m_clientRealmConfig.defaultRealm != "") {
			// Bind anonymously to LDAP
			LDAPCredentials* credentials = new LDAPCredentials;
			credentials->username = "";
			credentials->password = "";
			credentials->realm = m_clientRealmConfig.defaultRealm.upper();
			credentials->use_tls = false;
			LDAPManager* ldap_mgr = new LDAPManager(m_clientRealmConfig.defaultRealm.upper(), TQString("ldap://%1").arg(m_realms[m_clientRealmConfig.defaultRealm].admin_server).ascii(), credentials);
	
			// Add the domain-wide computer local admin group to local sudoers
			ldap_mgr->writeSudoersConfFile(&errorstring);

			// Get and install the CA root certificate from LDAP
			mkdir(TDE_CERTIFICATE_DIR, S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH);
			mkdir(KERBEROS_PKI_PUBLICDIR, S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH);
			if (ldap_mgr->getTDECertificate("publicRootCertificate", KERBEROS_PKI_PUBLICDIR + m_realms[m_clientRealmConfig.defaultRealm].admin_server + ".ldap.crt", &errorstring) != 0) {
				KMessageBox::sorry(this, i18n("<qt><b>Unable to obtain root certificate for realm %1!</b><p>Details: %2</qt>").arg(m_clientRealmConfig.defaultRealm.upper()).arg(errorstring), i18n("Unable to Obtain Certificate"));
			}
	
			delete ldap_mgr;
			delete credentials;
		}

		// Certificates may have changed; force the certificate update daemon to reload its configuration
		pid_t certUpdaterPID;
		TQFile pidFile(TDE_LDAP_CERT_UPDATER_PID_FILE);
		if (pidFile.open(IO_ReadOnly)) {
			TQTextStream stream(&pidFile);
			stream >> certUpdaterPID;
			pidFile.close();
			kill(certUpdaterPID, SIGHUP);
		}
	}

	load();
}

void LDAPConfig::processLockouts() {
	bool panelIsEnabled = (base->systemEnableSupport->isEnabled() && base->systemEnableSupport->isChecked());

	base->groupRealms->setEnabled(panelIsEnabled);
	base->groupKrbDefaults->setEnabled(panelIsEnabled);
	base->groupConnectionParameters->setEnabled(panelIsEnabled);
	base->groupPamConfig->setEnabled(panelIsEnabled);

	TQListViewItem *selrealm = base->ldapRealmList->selectedItem();
	if (selrealm) {
		LDAPRealmConfig realmcfg = m_realms[selrealm->text(1)];
		base->btnBondRealm->setEnabled(true);
		base->btnReBondRealm->setEnabled(true);
		if (realmcfg.bonded) {
			base->btnDeactivateRealm->setEnabled(true);
			base->btnRemoveRealm->setEnabled(false);
			base->btnRealmProperties->setEnabled(false);
		}
		else {
			base->btnDeactivateRealm->setEnabled(false);
			base->btnRemoveRealm->setEnabled(true);
			base->btnRealmProperties->setEnabled(true);
		}
	}
	else {
		base->btnBondRealm->setEnabled(true);
		base->btnReBondRealm->setEnabled(false);
		base->btnDeactivateRealm->setEnabled(false);
		base->btnRemoveRealm->setEnabled(false);
		base->btnRealmProperties->setEnabled(false);
	}

	if (base->pamCreateHomeDirectory->isChecked()) {
		base->pamCreateHomeDirectoryUmask->setEnabled(true);
		base->pamCreateHomeDirectorySkelDir->setEnabled(true);
	}
	else {
		base->pamCreateHomeDirectoryUmask->setEnabled(false);
		base->pamCreateHomeDirectorySkelDir->setEnabled(false);
	}
}

void LDAPConfig::bondToNewRealm() {
	// Something will probably change
	save();

	BondWizard bondwizard(&m_realms, this, this);
	bondwizard.exec();

	// Something probably changed
	load();
}

void LDAPConfig::reBondToRealm() {
	TQListViewItem *selrealm = base->ldapRealmList->selectedItem();
	if (selrealm) {
		TQString realmName = selrealm->text(1);
		LDAPRealmConfig realmcfg = m_realms[realmName];

		// Password prompt...
		TQString errorString;
		LDAPPasswordDialog passdlg(this);
		passdlg.m_base->ldapAdminRealm->setEnabled(false);
		passdlg.m_base->ldapAdminRealm->setText(realmName);
		if (passdlg.exec() == TQDialog::Accepted) {
			setEnabled(false);
			if ((LDAPManager::unbondRealm(m_realms[realmName], passdlg.m_base->ldapAdminUsername->text(), passdlg.m_base->ldapAdminPassword->password(), passdlg.m_base->ldapAdminRealm->text(), &errorString) == 0) || (!realmcfg.bonded)) {
				// Success!
				realmcfg.bonded = false;
				m_realms.remove(realmName);
				m_realms.insert(realmName, realmcfg);
				save();

				if (LDAPManager::bondRealm(passdlg.m_base->ldapAdminUsername->text(), passdlg.m_base->ldapAdminPassword->password(), passdlg.m_base->ldapAdminRealm->text(), &errorString) == 0) {
					// Success!
					realmcfg.bonded = true;
					m_realms.remove(realmName);
					m_realms.insert(realmName, realmcfg);
					save();
				}
				else {
					KMessageBox::error(this, i18n("<qt><b>Unable to bond to realm!</b><p>Details: %1</qt>").arg(errorString), i18n("Unable to Bond to Realm"));
				}
			}
			else {
				KMessageBox::error(this, i18n("<qt><b>Unable to unbond from realm!</b><p>%1</qt>").arg(errorString), i18n("Unable to Unbond from Realm"));
			}
			setEnabled(true);
		}
	}
	updateRealmList();
}

void LDAPConfig::removeRealm() {
	TQListViewItem *selrealm = base->ldapRealmList->selectedItem();
	if (selrealm) {
		m_realms.remove(selrealm->text(1));
		updateRealmList();
		changed();
	}
}

void LDAPConfig::deactivateRealm() {
	TQListViewItem *selrealm = base->ldapRealmList->selectedItem();
	if (selrealm) {
		TQString realmName = selrealm->text(1);
		LDAPRealmConfig realmcfg = m_realms[realmName];
		if (realmcfg.bonded == true) {
			// Password prompt...
			TQString errorString;
			LDAPPasswordDialog passdlg(this);
			passdlg.m_base->ldapAdminRealm->setEnabled(false);
			passdlg.m_base->ldapAdminRealm->setText(realmName);
			passdlg.m_base->passprompt->setText(i18n("Please provide LDAP realm administrator credentials below to complete the unbonding process"));
			if (passdlg.exec() == TQDialog::Accepted) {
				setEnabled(false);
				if (LDAPManager::unbondRealm(m_realms[realmName], passdlg.m_base->ldapAdminUsername->text(), passdlg.m_base->ldapAdminPassword->password(), passdlg.m_base->ldapAdminRealm->text(), &errorString) == 0) {
					// Success!
					realmcfg.bonded = false;
					m_realms.remove(realmName);
					m_realms.insert(realmName, realmcfg);
					save();
				}
				else {
					KMessageBox::error(this, i18n("<qt><b>Unable to unbond from realm!</b><p>%1</qt>").arg(errorString), i18n("Unable to Unbond from Realm"));
				}
				setEnabled(true);
			}
		}
	}
	updateRealmList();
}

void LDAPConfig::realmProperties() {
	TQListViewItem *selrealm = base->ldapRealmList->selectedItem();
	if (selrealm) {
		RealmPropertiesDialog rpdialog(&m_realms, selrealm->text(1), this);
		if (rpdialog.exec() == TQDialog::Accepted) {
			updateRealmList();
			changed();
		}
	}
}

int LDAPConfig::buttons() {
	return TDECModule::Apply|TDECModule::Help;
}

TQString LDAPConfig::quickHelp() const
{
	return i18n("This module configures which LDAP realms TDE uses for authentication.");
}