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/*
Copyright (c) 2016 Sandro Knauß <sknauss@kde.org>
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
This library 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 Library General Public
License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
*/
#include "applicationpkcs7mime.h"
#include "utils.h"
#include "attachmentstrategy.h"
#include "objecttreeparser.h"
#include "messagepart.h"
#include <QGpgME/Protocol>
#include <KMime/Content>
#include <QTextCodec>
#include "mimetreeparser_debug.h"
using namespace MimeTreeParser;
const ApplicationPkcs7MimeBodyPartFormatter *ApplicationPkcs7MimeBodyPartFormatter::self;
const Interface::BodyPartFormatter *ApplicationPkcs7MimeBodyPartFormatter::create()
{
if (!self) {
self = new ApplicationPkcs7MimeBodyPartFormatter();
}
return self;
}
Interface::BodyPartFormatter::Result ApplicationPkcs7MimeBodyPartFormatter::format(Interface::BodyPart *part, HtmlWriter *writer) const
{
Q_UNUSED(writer)
const auto p = process(*part);
const auto mp = static_cast<MessagePart *>(p.data());
if (mp) {
mp->html(false);
return Ok;
}
return Failed;
}
Interface::MessagePart::Ptr ApplicationPkcs7MimeBodyPartFormatter::process(Interface::BodyPart &part) const
{
KMime::Content *node = part.content();
if (node->head().isEmpty()) {
return MessagePart::Ptr();
}
const auto smimeCrypto = QGpgME::smime();
if (!smimeCrypto) {
return MessagePart::Ptr();
}
const QString smimeType = node->contentType()->parameter(QStringLiteral("smime-type")).toLower();
if (smimeType == QLatin1String("certs-only")) {
part.processResult()->setNeverDisplayInline(true);
CertMessagePart::Ptr mp(new CertMessagePart(part.objectTreeParser(), node, smimeCrypto, part.source()->autoImportKeys()));
return mp;
}
bool isSigned = (smimeType == QLatin1String("signed-data"));
bool isEncrypted = (smimeType == QLatin1String("enveloped-data"));
// Analyze "signTestNode" node to find/verify a signature.
// If zero part.objectTreeParser() verification was successfully done after
// decrypting via recursion by insertAndParseNewChildNode().
KMime::Content *signTestNode = isEncrypted ? nullptr : node;
// We try decrypting the content
// if we either *know* that it is an encrypted message part
// or there is neither signed nor encrypted parameter.
MessagePart::Ptr mp;
if (!isSigned) {
if (isEncrypted) {
qCDebug(MIMETREEPARSER_LOG) << "pkcs7 mime == S/MIME TYPE: enveloped (encrypted) data";
} else {
qCDebug(MIMETREEPARSER_LOG) << "pkcs7 mime - type unknown - enveloped (encrypted) data ?";
}
auto _mp = EncryptedMessagePart::Ptr(new EncryptedMessagePart(part.objectTreeParser(),
node->decodedText(), smimeCrypto,
part.nodeHelper()->fromAsString(node), node));
mp = _mp;
_mp->setIsEncrypted(true);
_mp->setDecryptMessage(part.source()->decryptMessage());
PartMetaData *messagePart(_mp->partMetaData());
if (!part.source()->decryptMessage()) {
isEncrypted = true;
signTestNode = nullptr; // PENDING(marc) to be abs. sure, we'd need to have to look at the content
} else {
_mp->startDecryption();
if (messagePart->isDecryptable) {
qCDebug(MIMETREEPARSER_LOG) << "pkcs7 mime - encryption found - enveloped (encrypted) data !";
isEncrypted = true;
part.nodeHelper()->setEncryptionState(node, KMMsgFullyEncrypted);
signTestNode = nullptr;
} else {
// decryption failed, which could be because the part was encrypted but
// decryption failed, or because we didn't know if it was encrypted, tried,
// and failed. If the message was not actually encrypted, we continue
// assuming it's signed
if (_mp->passphraseError() || (smimeType.isEmpty() && messagePart->isEncrypted)) {
isEncrypted = true;
signTestNode = nullptr;
}
if (isEncrypted) {
qCDebug(MIMETREEPARSER_LOG) << "pkcs7 mime - ERROR: COULD NOT DECRYPT enveloped data !";
} else {
qCDebug(MIMETREEPARSER_LOG) << "pkcs7 mime - NO encryption found";
}
}
}
if (isEncrypted) {
part.nodeHelper()->setEncryptionState(node, KMMsgFullyEncrypted);
}
}
// We now try signature verification if necessarry.
if (signTestNode) {
if (isSigned) {
qCDebug(MIMETREEPARSER_LOG) << "pkcs7 mime == S/MIME TYPE: opaque signed data";
} else {
qCDebug(MIMETREEPARSER_LOG) << "pkcs7 mime - type unknown - opaque signed data ?";
}
const QTextCodec *aCodec(part.objectTreeParser()->codecFor(signTestNode));
const QByteArray signaturetext = signTestNode->decodedContent();
auto _mp = SignedMessagePart::Ptr(new SignedMessagePart(part.objectTreeParser(),
aCodec->toUnicode(signaturetext), smimeCrypto,
part.nodeHelper()->fromAsString(node), signTestNode));
mp = _mp;
//mp->setDecryptMessage(part.source()->decryptMessage());
PartMetaData *messagePart(mp->partMetaData());
if (smimeCrypto) {
_mp->startVerificationDetached(signaturetext, nullptr, QByteArray());
} else {
messagePart->auditLogError = GpgME::Error(GPG_ERR_NOT_IMPLEMENTED);
}
if (_mp->isSigned()) {
if (!isSigned) {
qCDebug(MIMETREEPARSER_LOG) << "pkcs7 mime - signature found - opaque signed data !";
isSigned = true;
}
if (signTestNode != node) {
part.nodeHelper()->setSignatureState(node, KMMsgFullySigned);
}
} else {
qCDebug(MIMETREEPARSER_LOG) << "pkcs7 mime - NO signature found :-(";
}
}
return mp;
}
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