File indexing completed on 2024-12-22 05:05:18

 // SPDX-FileCopyrightText: 2003 Marc Mutz <mutz@kde.org>
 // SPDX-License-Identifier: GPL-2.0-only
 
 #include "mimetreeparser_core_debug.h"
 
 #include "bodypartformatter.h"
 
 #include "bodypartformatterbasefactory.h"
 #include "bodypartformatterbasefactory_p.h"
 
 #include "messagepart.h"
 #include "objecttreeparser.h"
 #include "utils.h"
 
 #include <KMime/Content>
 #include <QGpgME/Protocol>
 
 using namespace MimeTreeParser;
 using namespace MimeTreeParser::Interface;
 
 namespace MimeTreeParser
 {
 class AnyTypeBodyPartFormatter : public MimeTreeParser::Interface::BodyPartFormatter
 {
 };
 
 class MessageRfc822BodyPartFormatter : public MimeTreeParser::Interface::BodyPartFormatter
 {
 public:
     MessagePart::Ptr process(ObjectTreeParser *objectTreeParser, KMime::Content *node) const Q_DECL_OVERRIDE
     {
         return MessagePart::Ptr(new EncapsulatedRfc822MessagePart(objectTreeParser, node, node->bodyAsMessage()));
     }
 };
 
 class HeadersBodyPartFormatter : public MimeTreeParser::Interface::BodyPartFormatter
 {
 public:
     MessagePart::Ptr process(ObjectTreeParser *objectTreeParser, KMime::Content *node) const Q_DECL_OVERRIDE
     {
         return MessagePart::Ptr(new HeadersPart(objectTreeParser, node));
     }
 };
 
 class MultiPartRelatedBodyPartFormatter : public MimeTreeParser::Interface::BodyPartFormatter
 {
 public:
     QList<MessagePart::Ptr> processList(ObjectTreeParser *objectTreeParser, KMime::Content *node) const Q_DECL_OVERRIDE
     {
         if (node->contents().isEmpty()) {
             return {};
         }
         // We rely on the order of the parts.
         // Theoretically there could also be a Start parameter which would break this..
         // https://tools.ietf.org/html/rfc2387#section-4
 
         // We want to display attachments even if displayed inline.
         QList<MessagePart::Ptr> list;
         list.append(MimeMessagePart::Ptr(new MimeMessagePart(objectTreeParser, node->contents().at(0), true)));
         for (int i = 1; i < node->contents().size(); i++) {
             auto p = node->contents().at(i);
             if (KMime::isAttachment(p)) {
                 list.append(MimeMessagePart::Ptr(new MimeMessagePart(objectTreeParser, p, true)));
             }
         }
         return list;
     }
 };
 
 class MultiPartMixedBodyPartFormatter : public MimeTreeParser::Interface::BodyPartFormatter
 {
 public:
     MessagePart::Ptr process(ObjectTreeParser *objectTreeParser, KMime::Content *node) const Q_DECL_OVERRIDE
     {
         const auto contents = node->contents();
         if (contents.isEmpty()) {
             return {};
         }
 
         // we need the intermediate part to preserve the headers (necessary for with protected headers using multipart mixed)
         auto part = MessagePart::Ptr(new MessagePart(objectTreeParser, {}, node));
         part->appendSubPart(MimeMessagePart::Ptr(new MimeMessagePart(objectTreeParser, contents.at(0), false)));
         return part;
     }
 };
 
 class ApplicationPGPEncryptedBodyPartFormatter : public MimeTreeParser::Interface::BodyPartFormatter
 {
 public:
     MessagePart::Ptr process(ObjectTreeParser *objectTreeParser, KMime::Content *node) const Q_DECL_OVERRIDE
     {
         if (node->decodedContent().trimmed() != "Version: 1") {
             qCWarning(MIMETREEPARSER_CORE_LOG) << "Unknown PGP Version String:" << node->decodedContent().trimmed();
         }
 
         if (!node->parent()) {
             return MessagePart::Ptr();
         }
 
         KMime::Content *data = findTypeInDirectChildren(node->parent(), "application/octet-stream");
 
         if (!data) {
             return MessagePart::Ptr(); // new MimeMessagePart(objectTreeParser, node));
         }
 
         EncryptedMessagePart::Ptr mp(new EncryptedMessagePart(objectTreeParser, data->decodedText(), QGpgME::openpgp(), node, data));
         mp->setIsEncrypted(true);
         return mp;
     }
 };
 
 class ApplicationPkcs7MimeBodyPartFormatter : public MimeTreeParser::Interface::BodyPartFormatter
 {
 public:
     MessagePart::Ptr process(ObjectTreeParser *objectTreeParser, KMime::Content *node) const Q_DECL_OVERRIDE
     {
         if (node->head().isEmpty()) {
             return MessagePart::Ptr();
         }
 
         const QString smimeType = node->contentType()->parameter(QStringLiteral("smime-type")).toLower();
 
         if (smimeType == QLatin1StringView("certs-only")) {
             return CertMessagePart::Ptr(new CertMessagePart(objectTreeParser, node, QGpgME::smime()));
         }
 
         bool isSigned = (smimeType == QLatin1StringView("signed-data"));
         bool isEncrypted = (smimeType == QLatin1StringView("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_CORE_LOG) << "pkcs7 mime     ==      S/MIME TYPE: enveloped (encrypted) data";
             } else {
                 qCDebug(MIMETREEPARSER_CORE_LOG) << "pkcs7 mime  -  type unknown  -  enveloped (encrypted) data ?";
             }
 
             auto _mp = EncryptedMessagePart::Ptr(new EncryptedMessagePart(objectTreeParser, node->decodedText(), QGpgME::smime(), node));
             mp = _mp;
             _mp->setIsEncrypted(true);
             // 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_CORE_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_CORE_LOG) << "pkcs7 mime  -  ERROR: COULD NOT DECRYPT enveloped data !";
             //         } else {
             //             qCDebug(MIMETREEPARSER_CORE_LOG) << "pkcs7 mime  -  NO encryption found";
             //         }
             //     }
             // }
         }
 
         // We now try signature verification if necessarry.
         if (signTestNode) {
             if (isSigned) {
                 qCDebug(MIMETREEPARSER_CORE_LOG) << "pkcs7 mime     ==      S/MIME TYPE: opaque signed data";
             } else {
                 qCDebug(MIMETREEPARSER_CORE_LOG) << "pkcs7 mime  -  type unknown  -  opaque signed data ?";
             }
 
             return SignedMessagePart::Ptr(new SignedMessagePart(objectTreeParser, QGpgME::smime(), nullptr, signTestNode));
         }
         return mp;
     }
 };
 
 class MultiPartAlternativeBodyPartFormatter : public MimeTreeParser::Interface::BodyPartFormatter
 {
 public:
     MessagePart::Ptr process(ObjectTreeParser *objectTreeParser, KMime::Content *node) const Q_DECL_OVERRIDE
     {
         if (node->contents().isEmpty()) {
             return MessagePart::Ptr();
         }
 
         AlternativeMessagePart::Ptr mp(new AlternativeMessagePart(objectTreeParser, node));
         if (mp->mChildParts.isEmpty()) {
             return MimeMessagePart::Ptr(new MimeMessagePart(objectTreeParser, node->contents().at(0)));
         }
         return mp;
     }
 };
 
 class MultiPartEncryptedBodyPartFormatter : public MimeTreeParser::Interface::BodyPartFormatter
 {
 public:
     MessagePart::Ptr process(ObjectTreeParser *objectTreeParser, KMime::Content *node) const Q_DECL_OVERRIDE
     {
         if (node->contents().isEmpty()) {
             Q_ASSERT(false);
             return MessagePart::Ptr();
         }
 
         const QGpgME::Protocol *protocol = nullptr;
 
         /*
         ATTENTION: This code is to be replaced by the new 'auto-detect' feature. --------------------------------------
         */
         KMime::Content *data = findTypeInDirectChildren(node, "application/octet-stream");
         if (data) {
             protocol = QGpgME::openpgp();
         } else {
             data = findTypeInDirectChildren(node, "application/pkcs7-mime");
             if (data) {
                 protocol = QGpgME::smime();
             }
         }
         /*
         ---------------------------------------------------------------------------------------------------------------
         */
 
         if (!data) {
             return MessagePart::Ptr(new MimeMessagePart(objectTreeParser, node->contents().at(0)));
         }
 
         EncryptedMessagePart::Ptr mp(new EncryptedMessagePart(objectTreeParser, data->decodedText(), protocol, node, data));
         mp->setIsEncrypted(true);
         return mp;
     }
 };
 
 class MultiPartSignedBodyPartFormatter : public MimeTreeParser::Interface::BodyPartFormatter
 {
 public:
     static const QGpgME::Protocol *detectProtocol(const QString &protocolContentType_, const QString &signatureContentType)
     {
         auto protocolContentType = protocolContentType_;
         if (protocolContentType.isEmpty()) {
             qCWarning(MIMETREEPARSER_CORE_LOG) << "Message doesn't set the protocol for the multipart/signed content-type, "
                                                   "using content-type of the signature:"
                                                << signatureContentType;
             protocolContentType = signatureContentType;
         }
 
         const QGpgME::Protocol *protocol = nullptr;
         if (protocolContentType == QLatin1StringView("application/pkcs7-signature")
             || protocolContentType == QLatin1StringView("application/x-pkcs7-signature")) {
             protocol = QGpgME::smime();
         } else if (protocolContentType == QLatin1StringView("application/pgp-signature")
                    || protocolContentType == QLatin1StringView("application/x-pgp-signature")) {
             protocol = QGpgME::openpgp();
         }
         return protocol;
     }
 
     MessagePart::Ptr process(ObjectTreeParser *objectTreeParser, KMime::Content *node) const Q_DECL_OVERRIDE
     {
         if (node->contents().size() != 2) {
             qCDebug(MIMETREEPARSER_CORE_LOG) << "mulitpart/signed must have exactly two child parts!" << Qt::endl << "processing as multipart/mixed";
             if (!node->contents().isEmpty()) {
                 return MessagePart::Ptr(new MimeMessagePart(objectTreeParser, node->contents().at(0)));
             } else {
                 return MessagePart::Ptr();
             }
         }
 
         KMime::Content *signedData = node->contents().at(0);
         KMime::Content *signature = node->contents().at(1);
         Q_ASSERT(signedData);
         Q_ASSERT(signature);
 
         auto protocol = detectProtocol(node->contentType()->parameter(QStringLiteral("protocol")).toLower(),
                                        QLatin1StringView(signature->contentType()->mimeType().toLower()));
 
         if (!protocol) {
             return MessagePart::Ptr(new MimeMessagePart(objectTreeParser, signedData));
         }
 
         return SignedMessagePart::Ptr(new SignedMessagePart(objectTreeParser, protocol, signature, signedData));
     }
 };
 
 class TextHtmlBodyPartFormatter : public MimeTreeParser::Interface::BodyPartFormatter
 {
 public:
     MessagePart::Ptr process(ObjectTreeParser *objectTreeParser, KMime::Content *node) const Q_DECL_OVERRIDE
     {
         return HtmlMessagePart::Ptr(new HtmlMessagePart(objectTreeParser, node));
     }
 };
 
 class TextPlainBodyPartFormatter : public MimeTreeParser::Interface::BodyPartFormatter
 {
 public:
     MessagePart::Ptr process(ObjectTreeParser *objectTreeParser, KMime::Content *node) const Q_DECL_OVERRIDE
     {
         if (KMime::isAttachment(node)) {
             return AttachmentMessagePart::Ptr(new AttachmentMessagePart(objectTreeParser, node));
         }
         return TextMessagePart::Ptr(new TextMessagePart(objectTreeParser, node));
     }
 };
 
 } // anon namespace
 
 void BodyPartFormatterBaseFactoryPrivate::messageviewer_create_builtin_bodypart_formatters()
 {
     auto any = new AnyTypeBodyPartFormatter;
     auto textPlain = new TextPlainBodyPartFormatter;
     auto pkcs7 = new ApplicationPkcs7MimeBodyPartFormatter;
     auto pgp = new ApplicationPGPEncryptedBodyPartFormatter;
     auto html = new TextHtmlBodyPartFormatter;
     auto headers = new HeadersBodyPartFormatter;
     auto multipartAlternative = new MultiPartAlternativeBodyPartFormatter;
     auto multipartMixed = new MultiPartMixedBodyPartFormatter;
     auto multipartSigned = new MultiPartSignedBodyPartFormatter;
     auto multipartEncrypted = new MultiPartEncryptedBodyPartFormatter;
     auto message = new MessageRfc822BodyPartFormatter;
     auto multipartRelated = new MultiPartRelatedBodyPartFormatter;
 
     insert("application", "octet-stream", any);
     insert("application", "pgp", textPlain);
     insert("application", "pkcs7-mime", pkcs7);
     insert("application", "x-pkcs7-mime", pkcs7);
     insert("application", "pgp-encrypted", pgp);
     insert("application", "*", any);
 
     insert("text", "html", html);
     insert("text", "rtf", any);
     insert("text", "plain", textPlain);
     insert("text", "rfc822-headers", headers);
     insert("text", "*", textPlain);
 
     insert("image", "*", any);
 
     insert("message", "rfc822", message);
     insert("message", "*", any);
 
     insert("multipart", "alternative", multipartAlternative);
     insert("multipart", "encrypted", multipartEncrypted);
     insert("multipart", "signed", multipartSigned);
     insert("multipart", "related", multipartRelated);
     insert("multipart", "*", multipartMixed);
     insert("*", "*", any);
 }