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#ifndef CLIENTSIDEENCRYPTION_H
#define CLIENTSIDEENCRYPTION_H
#include <QString>
#include <QObject>
#include <QJsonDocument>
#include <QSslCertificate>
#include <QSslKey>
#include <QFile>
#include <QVector>
#include <QMap>
#include <openssl/evp.h>
#include "accountfwd.h"
#include "networkjobs.h"
namespace QKeychain {
class Job;
class WritePasswordJob;
class ReadPasswordJob;
}
namespace OCC {
QString e2eeBaseUrl();
namespace EncryptionHelper {
QByteArray generateRandomFilename();
OWNCLOUDSYNC_EXPORT QByteArray generateRandom(int size);
QByteArray generatePassword(const QString &wordlist, const QByteArray& salt);
OWNCLOUDSYNC_EXPORT QByteArray encryptPrivateKey(
const QByteArray& key,
const QByteArray& privateKey,
const QByteArray &salt
);
OWNCLOUDSYNC_EXPORT QByteArray decryptPrivateKey(
const QByteArray& key,
const QByteArray& data
);
OWNCLOUDSYNC_EXPORT QByteArray extractPrivateKeySalt(const QByteArray &data);
OWNCLOUDSYNC_EXPORT QByteArray encryptStringSymmetric(
const QByteArray& key,
const QByteArray& data
);
OWNCLOUDSYNC_EXPORT QByteArray decryptStringSymmetric(
const QByteArray& key,
const QByteArray& data
);
QByteArray privateKeyToPem(const QByteArray key);
//TODO: change those two EVP_PKEY into QSslKey.
QByteArray encryptStringAsymmetric(
EVP_PKEY *publicKey,
const QByteArray& data
);
QByteArray decryptStringAsymmetric(
EVP_PKEY *privateKey,
const QByteArray& data
);
OWNCLOUDSYNC_EXPORT bool fileEncryption(const QByteArray &key, const QByteArray &iv,
QFile *input, QFile *output, QByteArray& returnTag);
OWNCLOUDSYNC_EXPORT bool fileDecryption(const QByteArray &key, const QByteArray &iv,
QFile *input, QFile *output);
//
// Simple classes for safe (RAII) handling of OpenSSL
// data structures
//
class CipherCtx {
public:
CipherCtx() : _ctx(EVP_CIPHER_CTX_new())
{
}
~CipherCtx()
{
EVP_CIPHER_CTX_free(_ctx);
}
operator EVP_CIPHER_CTX*()
{
return _ctx;
}
private:
Q_DISABLE_COPY(CipherCtx)
EVP_CIPHER_CTX *_ctx;
};
class OWNCLOUDSYNC_EXPORT StreamingDecryptor
{
public:
StreamingDecryptor(const QByteArray &key, const QByteArray &iv, quint64 totalSize);
~StreamingDecryptor() = default;
QByteArray chunkDecryption(const char *input, quint64 chunkSize);
[[nodiscard]] bool isInitialized() const;
[[nodiscard]] bool isFinished() const;
private:
Q_DISABLE_COPY(StreamingDecryptor)
CipherCtx _ctx;
bool _isInitialized = false;
bool _isFinished = false;
quint64 _decryptedSoFar = 0;
quint64 _totalSize = 0;
};
}
namespace {
class PKey;
}
class OWNCLOUDSYNC_EXPORT ClientSideEncryption : public QObject {
Q_OBJECT
public:
ClientSideEncryption();
void initialize(const AccountPtr &account);
private:
void generateKeyPair(const AccountPtr &account);
void generateCSR(const AccountPtr &account, PKey keyPair);
void encryptPrivateKey(const AccountPtr &account);
public:
void forgetSensitiveData(const AccountPtr &account);
[[nodiscard]] bool newMnemonicGenerated() const;
public slots:
void slotRequestMnemonic();
private slots:
void publicKeyFetched(QKeychain::Job *incoming);
void privateKeyFetched(QKeychain::Job *incoming);
void mnemonicKeyFetched(QKeychain::Job *incoming);
signals:
void initializationFinished();
void mnemonicGenerated(const QString& mnemonic);
void showMnemonic(const QString& mnemonic);
private:
void getPrivateKeyFromServer(const AccountPtr &account);
void getPublicKeyFromServer(const AccountPtr &account);
void fetchAndValidatePublicKeyFromServer(const AccountPtr &account);
void decryptPrivateKey(const AccountPtr &account, const QByteArray &key);
void fetchFromKeyChain(const AccountPtr &account);
[[nodiscard]] bool checkPublicKeyValidity(const AccountPtr &account) const;
[[nodiscard]] bool checkServerPublicKeyValidity(const QByteArray &serverPublicKeyString) const;
void writePrivateKey(const AccountPtr &account);
void writeCertificate(const AccountPtr &account);
void writeMnemonic(const AccountPtr &account);
bool isInitialized = false;
public:
//QSslKey _privateKey;
QByteArray _privateKey;
QSslKey _publicKey;
QSslCertificate _certificate;
QString _mnemonic;
bool _newMnemonicGenerated = false;
};
/* Generates the Metadata for the folder */
struct EncryptedFile {
QByteArray encryptionKey;
QByteArray mimetype;
QByteArray initializationVector;
QByteArray authenticationTag;
QString encryptedFilename;
QString originalFilename;
int fileVersion;
int metadataKey;
};
class OWNCLOUDSYNC_EXPORT FolderMetadata {
public:
FolderMetadata(AccountPtr account, const QByteArray& metadata = QByteArray(), int statusCode = -1);
QByteArray encryptedMetadata();
void addEncryptedFile(const EncryptedFile& f);
void removeEncryptedFile(const EncryptedFile& f);
void removeAllEncryptedFiles();
[[nodiscard]] QVector<EncryptedFile> files() const;
private:
/* Use std::string and std::vector internally on this class
* to ease the port to Nlohmann Json API
*/
void setupEmptyMetadata();
void setupExistingMetadata(const QByteArray& metadata);
[[nodiscard]] QByteArray encryptMetadataKey(const QByteArray& metadataKey) const;
[[nodiscard]] QByteArray decryptMetadataKey(const QByteArray& encryptedKey) const;
[[nodiscard]] QByteArray encryptJsonObject(const QByteArray& obj, const QByteArray pass) const;
[[nodiscard]] QByteArray decryptJsonObject(const QByteArray& encryptedJsonBlob, const QByteArray& pass) const;
QVector<EncryptedFile> _files;
QMap<int, QByteArray> _metadataKeys;
AccountPtr _account;
QVector<QPair<QString, QString>> _sharing;
};
} // namespace OCC
#endif
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