mailitem-events.cpp
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mailitem-events.cpp
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	/* mailitem-events.h - Event handling for mails.
	* Copyright (C) 2015 by Bundesamt für Sicherheit in der Informationstechnik
	* Software engineering by Intevation GmbH
	*
	* This file is part of GpgOL.
	*
	* GpgOL is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2.1 of the License, or (at your option) any later version.
	*
	* GpgOL 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 Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public License
	* along with this program; if not, see <http://www.gnu.org/licenses/>.
	*/

	#include "config.h"
	#include "common.h"
	#include "eventsink.h"
	#include "eventsinks.h"
	#include "mymapi.h"
	#include "mymapitags.h"
	#include "oomhelp.h"
	#include "ocidl.h"
	#include "windowmessages.h"
	#include "mail.h"
	#include "mapihelp.h"
	#include "gpgoladdin.h"
	#include "wks-helper.h"

	#undef _
	#define _(a) utf8_gettext (a)

	const wchar_t *prop_blacklist[] = {
	L"Body",
	L"HTMLBody",
	L"To", /* Somehow this is done when a mail is opened */
	L"CC", /* Ditto */
	L"BCC", /* Ditto */
	L"Categories",
	L"UnRead",
	L"OutlookVersion",
	L"OutlookInternalVersion",
	L"ReceivedTime",
	L"InternetCodepage",
	L"ConversationIndex",
	L"Subject",
	L"SentOnBehalfOfName",
	L"MessageClass",
	L"BodyFormat",
	NULL };

	typedef enum
	{
	AfterWrite = 0xFC8D,
	AttachmentAdd = 0xF00B,
	AttachmentRead = 0xF00C,
	AttachmentRemove = 0xFBAE,
	BeforeAttachmentAdd = 0xFBB0,
	BeforeAttachmentPreview = 0xFBAF,
	BeforeAttachmentRead = 0xFBAB,
	BeforeAttachmentSave = 0xF00D,
	BeforeAttachmentWriteToTempFile = 0xFBB2,
	BeforeAutoSave = 0xFC02,
	BeforeCheckNames = 0xF00A,
	BeforeDelete = 0xFA75,
	BeforeRead = 0xFC8C,
	Close = 0xF004,
	CustomAction = 0xF006,
	CustomPropertyChange = 0xF008,
	Forward = 0xF468,
	Open = 0xF003,
	PropertyChange = 0xF009,
	Read = 0xF001,
	ReadComplete = 0xFC8F,
	Reply = 0xF466,
	ReplyAll = 0xF467,
	Send = 0xF005,
	Unload = 0xFBAD,
	Write = 0xF002
	} MailEvent;

	/* Mail Item Events */
	BEGIN_EVENT_SINK(MailItemEvents, IDispatch)
	/* We are still in the class declaration */

	private:
	Mail * m_mail; /* The mail object related to this mailitem */
	};

	MailItemEvents::MailItemEvents() :
	m_object(NULL),
	m_pCP(NULL),
	m_cookie(0),
	m_ref(1),
	m_mail(NULL)
	{
	}

	MailItemEvents::~MailItemEvents()
	{
	if (m_pCP)
	m_pCP->Unadvise(m_cookie);
	if (m_object)
	gpgol_release (m_object);
	}

	static bool propchangeWarnShown = false;
	static bool attachRemoveWarnShown = false;
	static bool addinsLogged = false;

	static DWORD WINAPI
	do_delayed_locate (LPVOID arg)
	{
	Sleep(100);
	do_in_ui_thread (RECIPIENT_ADDED, arg);
	return 0;
	}

	/* The main Invoke function. The return value of this
	function does not appear to have any effect on outlook
	although I have read in an example somewhere that you
	should return S_OK so that outlook continues to handle
	the event I have not yet seen any effect by returning
	error values here and no MSDN documentation about the
	return values.
	*/
	EVENT_SINK_INVOKE(MailItemEvents)
	{
	USE_INVOKE_ARGS
	TSTART;
	if (!m_mail)
	{
	m_mail = Mail::getMailForItem (m_object);
	if (!m_mail)
	{
	log_error ("%s:%s: mail event without mail object known. Bug.",
	SRCNAME, __func__);
	TRETURN S_OK;
	}
	}

	bool is_reply = false;
	switch(dispid)
	{
	case BeforeAutoSave:
	{
	log_oom ("%s:%s: BeforeAutoSave : %p",
	SRCNAME, __func__, m_mail);
	if (parms->cArgs != 1 \|\| parms->rgvarg[0].vt != (VT_BOOL \| VT_BYREF))
	{
	/* This happens in the weird case */
	log_debug ("%s:%s: Uncancellable BeforeAutoSave.",
	SRCNAME, __func__);
	TBREAK;
	}

	if (m_mail->isCryptoMail() && !m_mail->decryptedSuccessfully ())
	{
	*(parms->rgvarg[0].pboolVal) = VARIANT_TRUE;
	log_debug ("%s:%s: Autosave for not successfuly decrypted mail."
	"Cancel it.",
	SRCNAME, __func__);
	TBREAK;
	}

	if (opt.draft_key && (m_mail->needs_crypto_m () & 1) &&
	!m_mail->isDraftEncrypt())
	{
	log_debug ("%s:%s: Draft encryption for autosave starting now.",
	SRCNAME, __func__);
	m_mail->setIsDraftEncrypt (true);
	m_mail->prepareCrypto_o ();
	}
	TRETURN S_OK;
	}
	case Open:
	{
	log_oom ("%s:%s: Open : %p",
	SRCNAME, __func__, m_mail);
	int draft_flags = 0;
	if (!opt.encrypt_default && !opt.sign_default)
	{
	TRETURN S_OK;
	}
	LPMESSAGE message = get_oom_base_message (m_object);
	if (!message)
	{
	log_error ("%s:%s: Failed to get message.",
	SRCNAME, __func__);
	TBREAK;
	}
	if (opt.encrypt_default)
	{
	draft_flags = 1;
	}
	if (opt.sign_default)
	{
	draft_flags += 2;
	}
	set_gpgol_draft_info_flags (message, draft_flags);
	gpgol_release (message);
	TBREAK;
	}
	case BeforeRead:
	{
	log_oom ("%s:%s: BeforeRead : %p",
	SRCNAME, __func__, m_mail);
	if (GpgolAddin::get_instance ()->isShutdown())
	{
	log_debug ("%s:%s: Ignoring read after shutdown.",
	SRCNAME, __func__);
	TBREAK;
	}

	if (m_mail->preProcessMessage_m ())
	{
	log_error ("%s:%s: Pre process message failed.",
	SRCNAME, __func__);
	}

	if (m_mail->isDecryptAgain ())
	{
	log_debug ("%s:%s: Decrypting after 500ms",
	SRCNAME, __func__);
	do_in_ui_thread_async (DECRYPT, m_mail, 500);
	}
	TBREAK;
	}
	case Read:
	{
	log_oom ("%s:%s: Read : %p",
	SRCNAME, __func__, m_mail);
	if (!addinsLogged)
	{
	// We do it here as this nearly always comes and we want to remove
	// as much as possible from the startup time.
	log_addins ();
	addinsLogged = true;
	}
	if (!m_mail->isCryptoMail ())
	{
	log_debug ("%s:%s: Non crypto mail %p opened. Updating sigstatus.",
	SRCNAME, __func__, m_mail);
	/* Ensure that no wrong sigstatus is shown */
	CloseHandle(CreateThread (NULL, 0, delayed_invalidate_ui, (LPVOID) 300, 0,
	NULL));
	TBREAK;
	}
	if (m_mail->setUUID_o ())
	{
	log_debug ("%s:%s: Failed to set uuid.",
	SRCNAME, __func__);
	delete m_mail; /* deletes this, too */
	TRETURN S_OK;
	}
	if (m_mail->decryptVerify_o ())
	{
	log_error ("%s:%s: Decrypt message failed.",
	SRCNAME, __func__);
	}
	if (!opt.enable_smime && m_mail->isSMIME_m ())
	{
	/* We want to save the mail when it's an smime mail and smime
	is disabled to revert it. */
	log_debug ("%s:%s: S/MIME mail but S/MIME is disabled."
	" Need save.",
	SRCNAME, __func__);
	m_mail->setNeedsSave (true);
	}
	TBREAK;
	}
	case PropertyChange:
	{
	if (!parms \|\| parms->cArgs != 1 \|\|
	parms->rgvarg[0].vt != VT_BSTR \|\|
	!parms->rgvarg[0].bstrVal)
	{
	log_error ("%s:%s: Unexpected params.",
	SRCNAME, __func__);
	TBREAK;
	}
	const wchar_t *prop_name = parms->rgvarg[0].bstrVal;
	if (!m_mail->isCryptoMail ())
	{
	if (m_mail->hasOverrideMimeData())
	{
	/* This is a mail created by us. Ignore propchanges. */
	TBREAK;
	}
	if (!wcscmp (prop_name, L"To") /* \|\|
	!wcscmp (prop_name, L"BCC") \|\|
	!wcscmp (prop_name, L"CC")
	Testing shows that Outlook always sends these three in a row
	*/)
	{
	if (opt.autosecure \|\| (m_mail->needs_crypto_m () & 1))
	{
	/* XXX Racy race. This is a fix for crashes
	that happend if a resolved recipient is copied an pasted.
	If we then access the recipients object in the Property
	Change event we crash. Thus we do the delay dance. */
	HANDLE thread = CreateThread (NULL, 0, do_delayed_locate,
	(LPVOID) m_mail, 0,
	NULL);
	CloseHandle(thread);
	}
	}
	TBREAK;
	}
	for (const wchar_t *cur = prop_blacklist; cur; cur++)
	{
	if (!wcscmp (prop_name, *cur))
	{
	log_oom ("%s:%s: Mail %p propchange: %ls no warning.",
	SRCNAME, __func__, m_mail, prop_name);
	TRETURN S_OK;
	}
	}
	log_oom ("%s:%s: Mail %p propchange: %ls.",
	SRCNAME, __func__, m_mail, prop_name);

	if (!wcscmp (prop_name, L"SendUsingAccount"))
	{
	bool sent = get_oom_bool (m_object, "Sent");
	if (sent)
	{
	log_debug ("%s:%s: Ignoring SendUsingAccount change for sent %p ",
	SRCNAME, __func__, m_object);
	TRETURN S_OK;
	}
	log_debug ("%s:%s: Message %p looks like send again.",
	SRCNAME, __func__, m_object);
	m_mail->setIsSendAgain (true);
	TRETURN S_OK;
	}
	if (is_draft_mail (m_object))
	{
	log_oom ("%s:%s: Change allowed for draft",
	SRCNAME, __func__);
	TRETURN S_OK;
	}

	/* We have tried several scenarios to handle propery changes.
	Only save the property in MAPI and call MAPI SaveChanges
	worked and did not leak plaintext but this caused outlook
	still to break the attachments of PGP/MIME Mails into two
	attachments and add them as winmail.dat so other clients
	are broken.

	Alternatively reverting the mail, saving the property and
	then decrypt again also worked a bit but there were some
	weird side effects and breakages. But this has the usual
	problem of a revert that the mail is created by outlook and
	e.g. multipart/signed signatures from most MUA's are broken.

	Some things to try out might be the close approach and then
	another open or a selection change. But for now we just warn.

	As a workardound a user should make property changes when
	the mail was not read by us. */
	if (propchangeWarnShown)
	{
	TRETURN S_OK;
	}

	wchar_t *title = utf8_to_wchar (_("Sorry, that's not possible, yet"));
	char *fmt;
	gpgrt_asprintf (&fmt, _("GpgOL has prevented the change to the \"%s\" property.\n"
	"Property changes are not yet handled for crypto messages.\n\n"
	"To workaround this limitation please change the property when the "
	"message is not open in any window and not selected in the "
	"messagelist.\n\nFor example by right clicking but not selecting the message.\n"),
	wchar_to_utf8(prop_name));
	memdbg_alloc (fmt);
	wchar_t *msg = utf8_to_wchar (fmt);
	xfree (fmt);
	MessageBoxW (get_active_hwnd(), msg, title,
	MB_ICONINFORMATION \| MB_OK);
	xfree (msg);
	xfree (title);
	propchangeWarnShown = true;
	TRETURN S_OK;
	}
	case CustomPropertyChange:
	{
	log_oom ("%s:%s: CustomPropertyChange : %p",
	SRCNAME, __func__, m_mail);
	/* TODO */
	TBREAK;
	}
	case Send:
	{
	/* This is the only event where we can cancel the send of a
	mailitem. But it is too early for us to encrypt as the MAPI
	structures are not yet filled. Crypto based on the
	Outlook Object Model data did not work as the messages
	were only sent out empty. See 2b376a48 for a try of
	this.

	This is why we store send_seen and invoke a save which
	may result in an error but only after triggering all the
	behavior we need -> filling mapi structures and invoking the
	AfterWrite handler where we encrypt.

	If this encryption is successful and we pass the send
	as then the encrypted data is sent.
	*/
	log_oom ("%s:%s: Send : %p",
	SRCNAME, __func__, m_mail);
	if (!m_mail->needs_crypto_m () && m_mail->cryptState () == Mail::NoCryptMail)
	{
	if (m_mail->isCryptoMail ())
	{
	log_debug ("%s:%s: Want to send crypto mail without crypto. "
	"Decrypting.", SRCNAME, __func__);
	m_mail->decryptPermanently_o ();
	TBREAK;
	}
	log_debug ("%s:%s: No crypto neccessary. Passing send for %p obj %p",
	SRCNAME, __func__, m_mail, m_object);
	TBREAK;
	}

	if (parms->cArgs != 1 \|\| parms->rgvarg[0].vt != (VT_BOOL \| VT_BYREF))
	{
	log_debug ("%s:%s: Uncancellable send event.",
	SRCNAME, __func__);
	TBREAK;
	}

	if (m_mail->cryptState () == Mail::NoCryptMail &&
	m_mail->needs_crypto_m ())
	{
	log_debug ("%s:%s: Send event for crypto mail %p saving and starting.",
	SRCNAME, __func__, m_mail);

	m_mail->prepareCrypto_o ();
	m_mail->setIsDraftEncrypt (false);

	// Save the Mail
	invoke_oom_method (m_object, "Save", NULL);

	if (!m_mail->isAsyncCryptDisabled ())
	{
	// The afterwrite in the save should have triggered
	// the encryption. We cancel send for our asyncness.
	// Cancel send
	*(parms->rgvarg[0].pboolVal) = VARIANT_TRUE;
	TBREAK;
	}
	else
	{
	if (m_mail->cryptState () == Mail::NoCryptMail)
	{
	// Crypto failed or was canceled
	log_debug ("%s:%s: Message %p mail %p cancelling send - "
	"Crypto failed or canceled.",
	SRCNAME, __func__, m_object, m_mail);
	*(parms->rgvarg[0].pboolVal) = VARIANT_TRUE;
	TBREAK;
	}
	// For inline response we can't trigger send programatically
	// so we do the encryption in sync.
	if (m_mail->cryptState () == Mail::NeedsUpdateInOOM)
	{
	m_mail->updateCryptOOM_o ();
	}
	if (m_mail->cryptState () == Mail::NeedsSecondAfterWrite)
	{
	m_mail->setCryptState (Mail::WantsSendMIME);
	}
	if (m_mail->getDoPGPInline () && m_mail->cryptState () != Mail::WantsSendInline)
	{
	log_debug ("%s:%s: Message %p mail %p cancelling send - "
	"Invalid state.",
	SRCNAME, __func__, m_object, m_mail);
	gpgol_bug (m_mail->getWindow (),
	ERR_INLINE_BODY_INV_STATE);
	*(parms->rgvarg[0].pboolVal) = VARIANT_TRUE;
	TBREAK;
	}
	}
	}

	if (m_mail->cryptState () == Mail::WantsSendInline)
	{
	if (!m_mail->hasCryptedOrEmptyBody_o ())
	{
	log_debug ("%s:%s: Message %p mail %p cancelling send - "
	"not encrypted or not empty body detected.",
	SRCNAME, __func__, m_object, m_mail);
	gpgol_bug (m_mail->getWindow (),
	ERR_WANTS_SEND_INLINE_BODY);
	m_mail->setCryptState (Mail::NoCryptMail);
	*(parms->rgvarg[0].pboolVal) = VARIANT_TRUE;
	TBREAK;
	}
	log_debug ("%s:%s: Passing send event for no-mime message %p.",
	SRCNAME, __func__, m_object);
	WKSHelper::instance()->allow_notify (1000);
	TBREAK;
	}

	if (m_mail->cryptState () == Mail::WantsSendMIME)
	{
	if (!m_mail->hasCryptedOrEmptyBody_o ())
	{
	/* The safety checks here trigger too often. Somehow for some
	users the body is not empty after the encryption but when
	it is sent it is still sent with the crypto content because
	the encrypted MIME Structure is used because it is
	correct in MAPI land.

	For safety reasons enabling the checks might be better but
	until we figure out why for some users the body replacement
	does not work we have to disable them. Otherwise GpgOL
	is unusuable for such users. GnuPG-Bug-Id: T3875
	*/
	#define DISABLE_SAFTEY_CHECKS
	#ifndef DISABLE_SAFTEY_CHECKS
	gpgol_bug (m_mail->getWindow (),
	ERR_WANTS_SEND_MIME_BODY);
	log_debug ("%s:%s: Message %p mail %p cancelling send mime - "
	"not encrypted or not empty body detected.",
	SRCNAME, __func__, m_object, m_mail);
	m_mail->setCryptState (Mail::NoCryptMail);
	*(parms->rgvarg[0].pboolVal) = VARIANT_TRUE;
	TBREAK;
	#else
	log_debug ("%s:%s: Message %p mail %p - "
	"not encrypted or not empty body detected - MIME.",
	SRCNAME, __func__, m_object, m_mail);
	#endif
	}
	/* Now we adress T3656 if Outlooks internal S/MIME is somehow
	* mixed in (even if it is enabled and then disabled) it might
	* cause strange behavior in that it sends the plain message
	* and not the encrypted message. Tests have shown that we can
	* bypass that by calling submit message on our base
	* message.
	*
	* We do this conditionally as our other way of using OOM
	* to send is proven to work and we don't want to mess
	* with it.
	*/
	// Get the Message class.
	HRESULT hr;
	LPSPropValue propval = NULL;

	// It's important we use the _not_ base message here.
	LPMESSAGE message = get_oom_message (m_object);
	hr = HrGetOneProp ((LPMAPIPROP)message, PR_MESSAGE_CLASS_A, &propval);
	gpgol_release (message);
	if (FAILED (hr))
	{
	log_error ("%s:%s: HrGetOneProp() failed: hr=%#lx\n",
	SRCNAME, __func__, hr);
	TBREAK;
	}
	if (propval->Value.lpszA && !strstr (propval->Value.lpszA, "GpgOL") &&
	strcmp (propval->Value.lpszA, "IPM.Note.SMIME.MultipartSigned") &&
	strcmp (propval->Value.lpszA, "IPM.Note.SMIME"))
	{
	// Does not have a message class by us.
	log_debug ("%s:%s: Message %p - No GpgOL Message class "
	"after crypto. cls is: '%s'",
	SRCNAME, __func__, m_object, propval->Value.lpszA);
	log_debug ("%s:%s: Message %p - Activating T3656 Workaround",
	SRCNAME, __func__, m_object);
	message = get_oom_base_message (m_object);
	if (message)
	{
	// It's important we use the _base_ message here.
	mapi_save_changes (message, FORCE_SAVE);
	message->SubmitMessage(0);
	gpgol_release (message);
	// Close the composer and trigger unloads
	CloseHandle(CreateThread (NULL, 0, close_mail, (LPVOID) m_mail, 0,
	NULL));
	}
	else
	{
	gpgol_bug (nullptr,
	ERR_GET_BASE_MSG_FAILED);
	}
	// Cancel send
	*(parms->rgvarg[0].pboolVal) = VARIANT_TRUE;
	}
	MAPIFreeBuffer (propval);
	if (*(parms->rgvarg[0].pboolVal) == VARIANT_TRUE)
	{
	TBREAK;
	}
	log_debug ("%s:%s: Passing send event for mime-encrypted message %p.",
	SRCNAME, __func__, m_object);
	WKSHelper::instance()->allow_notify (1000);
	TBREAK;
	}
	else
	{
	log_debug ("%s:%s: Message %p cancelling send - "
	"crypto or second save failed.",
	SRCNAME, __func__, m_object);
	*(parms->rgvarg[0].pboolVal) = VARIANT_TRUE;
	}
	TRETURN S_OK;
	}
	case ReadComplete:
	{
	log_oom ("%s:%s: ReadComplete: %p",
	SRCNAME, __func__, m_mail);
	TRETURN S_OK;
	}
	case Write:
	{
	log_oom ("%s:%s: Write : %p",
	SRCNAME, __func__, m_mail);
	/* This is a bit strange. We sometimes get multiple write events
	without a read in between. When we access the message in
	the second event it fails and if we cancel the event outlook
	crashes. So we have keep the m_needs_wipe state variable
	to keep track of that. */
	if (parms->cArgs != 1 \|\| parms->rgvarg[0].vt != (VT_BOOL \| VT_BYREF))
	{
	/* This happens in the weird case */
	log_debug ("%s:%s: Uncancellable write event.",
	SRCNAME, __func__);
	TBREAK;
	}

	if (m_mail->passWrite())
	{
	log_debug ("%s:%s: Passing write because passNextWrite was set for %p",
	SRCNAME, __func__, m_mail);
	m_mail->setPassWrite (false);
	TBREAK;
	}

	if (m_mail->cryptState() == Mail::NeedsFirstAfterWrite)
	{
	log_debug ("%s:%s: Crypto mail needs first after write. "
	"Auto-Passing but removing our categories.",
	SRCNAME, __func__);

	m_mail->removeCategories_o ();
	if (g_mail_copy_triggerer)
	{
	log_dbg ("Needs first after write for copied mail.");
	g_mail_copy_triggerer->splitCopyMailCallback (m_mail);
	}
	TBREAK;
	}

	if (m_mail->isCryptoMail () && !m_mail->needsSave ())
	{
	if (opt.draft_key && (m_mail->needs_crypto_m () & 1) &&
	is_draft_mail (m_object) && m_mail->decryptedSuccessfully ())
	{
	if (m_mail->cryptState () == Mail::NeedsFirstAfterWrite \|\|
	m_mail->cryptState () == Mail::NeedsSecondAfterWrite)
	{
	log_debug ("%s:%s: re-encryption in progress. Passing.",
	SRCNAME, __func__);
	TBREAK;
	}
	/* This is the case for a modified draft */
	log_debug ("%s:%s: Draft re-encryption starting now.",
	SRCNAME, __func__);
	m_mail->setIsDraftEncrypt (true);
	m_mail->prepareCrypto_o ();
	/* Passing write to trigger encrypt in after write */
	TBREAK;
	}
	if (m_mail->cryptState() == Mail::WantsSendMIME)
	{
	log_debug ("%s:%s: Mail wants send mime. Passing.",
	SRCNAME, __func__);
	TBREAK;
	}

	Mail *last_mail = Mail::getLastMail ();
	if (Mail::isValidPtr (last_mail))
	{
	/* We want to identify here if there was a mail created that
	should receive the contents of this mail. For this we check
	for a write in the same loop as a mail creation.
	Now when switching from one mail to another this is also what
	happens. The new mail is loaded and the old mail is written.
	To distinguish the two we check that the new mail does not have
	an entryID, a Subject and No Size. Maybe just size or entryID
	would be enough but better save then sorry.

	Security consideration: Worst case we pass the write here but
	an unload follows before we get the scheduled revert. This
	would leak plaintext. But does not happen in our tests.

	Similarly if we crash or Outlook is closed before we see this
	revert. But as we immediately revert after the write this should
	also not happen. */
	const std::string lastSubject = last_mail->getSubject_o ();
	char *lastEntryID = get_oom_string (last_mail->item (), "EntryID");
	int lastSize = get_oom_int (last_mail->item (), "Size");
	std::string lastEntryStr;
	if (lastEntryID)
	{
	lastEntryStr = lastEntryID;
	xfree (lastEntryID);
	}

	if (!lastSize && !lastEntryStr.size () && !lastSubject.size ())
	{
	log_debug ("%s:%s: Write in the same loop as empty load."
	" Pass but schedule revert.",
	SRCNAME, __func__);

	/* This might be a forward. So don't invalidate yet. */

	// Mail::clearLastMail ();

	do_in_ui_thread_async (REVERT_MAIL, m_mail);
	TRETURN S_OK;
	}
	}
	/* We cancel the write event to stop outlook from excessively
	syncing our changes.
	if smime support is disabled and we still have an smime
	mail we also don't want to cancel the write event
	to enable reverting this mails.
	*/
	*(parms->rgvarg[0].pboolVal) = VARIANT_TRUE;
	log_debug ("%s:%s: Canceling write event.",
	SRCNAME, __func__);
	TRETURN S_OK;
	}

	if (m_mail->isCryptoMail () && m_mail->needsSave () &&
	m_mail->revert_o ())
	{
	/* An error cleaning the mail should not happen normally.
	But just in case there is an error we cancel the
	write here. */
	log_debug ("%s:%s: Failed to remove plaintext. Canceling.",
	SRCNAME, __func__);
	*(parms->rgvarg[0].pboolVal) = VARIANT_TRUE;
	TRETURN S_OK;
	}

	if (!m_mail->isCryptoMail () && m_mail->is_forwarded_crypto_mail () &&
	!m_mail->needs_crypto_m () && m_mail->cryptState () == Mail::NoCryptMail)
	{
	/* We are sure now that while this is a forward of an encrypted
	* mail that the forward should not be signed or encrypted. So
	* it's not constructed by us. We need to remove our attachments
	* though so that they are not included in the forward. */
	log_debug ("%s:%s: Writing unencrypted forward of crypt mail. "
	"Removing attachments. mail: %p item: %p",
	SRCNAME, __func__, m_mail, m_object);
	if (m_mail->removeOurAttachments_o ())
	{
	// Worst case we forward some encrypted data here not
	// a security problem, so let it pass.
	log_error ("%s:%s: Failed to remove our attachments.",
	SRCNAME, __func__);
	}
	/* Remove marker because we did this now. */
	m_mail->setIsForwardedCryptoMail (false);
	}

	if (m_mail->isDraftEncrypt () &&
	m_mail->cryptState () != Mail::NeedsFirstAfterWrite &&
	m_mail->cryptState () != Mail::NeedsSecondAfterWrite)
	{
	log_debug ("%s:%s: Canceling write because draft encrypt is in"
	" progress.",
	SRCNAME, __func__);
	*(parms->rgvarg[0].pboolVal) = VARIANT_TRUE;
	TRETURN S_OK;
	}

	if (opt.draft_key && (m_mail->needs_crypto_m () & 1) &&
	!m_mail->isDraftEncrypt() &&
	m_mail->cryptState() == Mail::NoCryptMail)
	{
	log_debug ("%s:%s: Draft encryption starting now.",
	SRCNAME, __func__);
	m_mail->setIsDraftEncrypt (true);
	m_mail->prepareCrypto_o ();
	}

	log_debug ("%s:%s: Passing write event. %i %i",
	SRCNAME, __func__, m_mail->isDraftEncrypt(), m_mail->cryptState());
	m_mail->setNeedsSave (false);
	TBREAK;
	}
	case AfterWrite:
	{
	log_oom ("%s:%s: AfterWrite : %p",
	SRCNAME, __func__, m_mail);
	if (m_mail->cryptState () == Mail::NeedsFirstAfterWrite)
	{
	/* Seen the first after write. Advance the state */
	m_mail->setCryptState (Mail::NeedsActualCrypt);
	if (m_mail->encryptSignStart_o ())
	{
	log_debug ("%s:%s: Encrypt sign start failed.",
	SRCNAME, __func__);
	m_mail->setCryptState (Mail::NoCryptMail);
	if (!m_mail->isAsyncCryptDisabled())
	{
	m_mail->releaseCurrentItem();
	}
	}
	TRETURN S_OK;
	}
	if (m_mail->cryptState () == Mail::NeedsSecondAfterWrite)
	{
	m_mail->setCryptState (Mail::NeedsUpdateInMAPI);
	m_mail->updateCryptMAPI_m ();
	log_debug ("%s:%s: Second after write done.",
	SRCNAME, __func__);
	TRETURN S_OK;
	}
	TBREAK;
	}
	case Close:
	{
	log_oom ("%s:%s: Close : %p",
	SRCNAME, __func__, m_mail);
	if (m_mail->isCryptoMail ())
	{
	if (is_draft_mail (m_object))
	{
	/* In that case we want to ask the question to avoid data loss
	*/
	log_oom ("%s:%s: Passing close because of draft status: %p",
	SRCNAME, __func__, m_mail);
	m_mail->setDecryptAgain (true);
	TBREAK;
	}
	/* Close. This happens when an Opened mail is closed.
	To prevent the question of wether or not to save the changes
	(Which would save the decrypted data without an event to
	prevent it) we cancel the close and then either close it
	with discard changes or revert / save it.
	Contrary to documentation we can invoke close from
	close.
	*/
	if (parms->cArgs != 1 \|\| parms->rgvarg[0].vt != (VT_BOOL \| VT_BYREF))
	{
	/* This happens in the weird case */
	log_debug ("%s:%s: Uncancellable close event.",
	SRCNAME, __func__);
	TBREAK;
	}
	if (m_mail->getCloseTriggered ())
	{
	/* Our close with discard changes, pass through */
	m_mail->setCloseTriggered (false);
	TRETURN S_OK;
	}
	*(parms->rgvarg[0].pboolVal) = VARIANT_TRUE;
	log_oom ("%s:%s: Canceling close event.",
	SRCNAME, __func__);
	if (m_mail->close ())
	{
	log_debug ("%s:%s: Close request failed.",
	SRCNAME, __func__);
	}
	}
	TRETURN S_OK;
	}
	case Unload:
	{
	log_oom ("%s:%s: Unload : %p",
	SRCNAME, __func__, m_mail);
	log_debug ("%s:%s: Removing Mail for message: %p.",
	SRCNAME, __func__, m_object);
	delete m_mail;
	log_oom ("%s:%s: deletion done",
	SRCNAME, __func__);
	memdbg_dump ();
	TRETURN S_OK;
	}
	case ReplyAll:
	case Reply:
	is_reply = true;
	/* fall through */
	case Forward:
	{
	log_oom ("%s:%s: %s : %p",
	SRCNAME, __func__, is_reply ? "reply" : "forward", m_mail);
	int draft_flags = 0;
	if (opt.encrypt_default)
	{
	draft_flags = 1;
	}
	if (opt.sign_default)
	{
	draft_flags += 2;
	}
	bool is_crypto_mail = m_mail->isCryptoMail ();

	/* If it is a crypto mail and the settings should not be taken
	* from the crypto mail and always encrypt / sign is on. Or
	* If it is not a crypto mail and we have automaticalls sign_encrypt. */
	if ((is_crypto_mail && !opt.reply_crypt && draft_flags) \|\|
	(!is_crypto_mail && draft_flags))
	{
	/* Check if we can use the dispval */
	if (parms->cArgs == 2 && parms->rgvarg[1].vt == (VT_DISPATCH) &&
	parms->rgvarg[0].vt == (VT_BOOL \| VT_BYREF))
	{
	LPMESSAGE msg = get_oom_base_message (parms->rgvarg[1].pdispVal);
	if (msg)
	{
	set_gpgol_draft_info_flags (msg, draft_flags);
	gpgol_release (msg);
	}
	else
	{
	log_error ("%s:%s: Failed to get base message.",
	SRCNAME, __func__);
	}
	}
	else
	{
	log_error ("%s:%s: Unexpected parameters.",
	SRCNAME, __func__);
	}
	}

	if (!is_crypto_mail)
	{
	/* Replys to non crypto mails do not interest us anymore. */
	TBREAK;
	}

	Mail *last_mail = Mail::getLastMail ();
	if (Mail::isValidPtr (last_mail))
	{
	/* We want to identify here if there was a mail created that
	should receive the contents of this mail. For this we check
	for a forward in the same loop as a mail creation.

	We need to do it this complicated and can't just use
	get_mail_for_item because the mailitem pointer we get here
	is a different one then the one with which the mail was loaded.
	*/
	char *lastEntryID = get_oom_string (last_mail->item (), "EntryID");
	int lastSize = get_oom_int (last_mail->item (), "Size");
	std::string lastEntryStr;
	if (lastEntryID)
	{
	lastEntryStr = lastEntryID;
	xfree (lastEntryID);
	}

	if (!lastSize && !lastEntryStr.size ())
	{
	if (!is_reply)
	{
	log_debug ("%s:%s: Forward in the same loop as empty "
	"load Marking %p (item %p) as forwarded.",
	SRCNAME, __func__, last_mail,
	last_mail->item ());

	last_mail->setIsForwardedCryptoMail (true);
	}
	else
	{
	log_debug ("%s:%s: Reply in the same loop as empty "
	"load Marking %p (item %p) as reply.",
	SRCNAME, __func__, last_mail,
	last_mail->item ());
	}
	if (m_mail->isBlockHTML ())
	{
	std::string buf;
	/** TRANSLATORS: Part of a warning dialog that disallows
	reply and forward with contents */
	buf = is_reply ? _("You are replying to an unsigned S/MIME "
	"email.") :
	_("You are forwarding an unsigned S/MIME "
	"email.");
	buf +="\n\n";
	buf += _("In this version of S/MIME an attacker could "
	"use the missing signature to have you "
	"decrypt contents from a different, otherwise "
	"completely unrelated email and place it in the "
	"quote so they can get hold of it.\n"
	"This is why we only allow quoting to be done manually.");
	buf += "\n\n";
	buf += _("Please copy the relevant contents and insert "
	"them into the new email.");

	gpgol_message_box (get_active_hwnd (), buf.c_str(),
	_("GpgOL"), MB_OK);

	do_in_ui_thread_async (CLEAR_REPLY_FORWARD, last_mail, 1000);
	}
	}
	// We can now invalidate the last mail
	Mail::clearLastMail ();
	}

	log_oom ("%s:%s: Reply Forward ReplyAll: %p",
	SRCNAME, __func__, m_mail);
	if (!opt.reply_crypt)
	{
	TBREAK;
	}
	int crypto_flags = 0;
	if (!(crypto_flags = m_mail->getCryptoFlags ()))
	{
	TBREAK;
	}
	if (parms->cArgs != 2 \|\| parms->rgvarg[1].vt != (VT_DISPATCH) \|\|
	parms->rgvarg[0].vt != (VT_BOOL \| VT_BYREF))
	{
	/* This happens in the weird case */
	log_debug ("%s:%s: Unexpected args %i %x %x named: %i",
	SRCNAME, __func__, parms->cArgs, parms->rgvarg[0].vt, parms->rgvarg[1].vt,
	parms->cNamedArgs);
	TBREAK;
	}
	LPMESSAGE msg = get_oom_base_message (parms->rgvarg[1].pdispVal);
	if (!msg)
	{
	log_debug ("%s:%s: Failed to get base message",
	SRCNAME, __func__);
	TBREAK;
	}
	set_gpgol_draft_info_flags (msg, crypto_flags);
	gpgol_release (msg);
	TBREAK;
	}
	case AttachmentRemove:
	{
	log_oom ("%s:%s: AttachmentRemove: %p",
	SRCNAME, __func__, m_mail);
	if (!m_mail->isCryptoMail () \|\| attachRemoveWarnShown \|\|
	m_mail->attachmentRemoveWarningDisabled ())
	{
	TRETURN S_OK;
	}
	gpgol_message_box (get_active_hwnd (),
	_("Attachments are part of the crypto message.\nThey "
	"can't be permanently removed and will be shown again the next "
	"time this message is opened."),
	_("Sorry, that's not possible, yet"), MB_OK);
	attachRemoveWarnShown = true;
	TRETURN S_OK;
	}

	default:
	log_oom ("%s:%s: Message:%p Unhandled Event: %lx \n",
	SRCNAME, __func__, m_object, dispid);
	}
	TRETURN S_OK;
	}
	END_EVENT_SINK(MailItemEvents, IID_MailItemEvents)

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