Implement Keyring system base

libsettings/include/keyring.h

@@ -0,0 +1,85 @@
+/* Copyright 2013 MultiMC Contributors
+ *
+ * Authors: Orochimarufan <orochimarufan.x3@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef KEYRING_H
+#define KEYRING_H
+
+#include <QObject>
+
+#include "libsettings_config.h"
+
+/**
+ * @file libsettings/include/keyring.h
+ * Access to System Keyrings
+ */
+
+/**
+ * @brief The Keyring class
+ * the System Keyring/Keychain/Wallet/Vault/etc
+ */
+class LIBMMCSETTINGS_EXPORT Keyring : public QObject
+{
+    Q_OBJECT
+public:
+    /**
+     * @brief the System Keyring instance
+     * @return the Keyring instance
+     */
+    static Keyring *instance();
+
+    /**
+     * @brief store a password in the Keyring
+     * @param service the service name
+     * @param username the account name
+     * @param password the password to store
+     * @return success
+     */
+    virtual bool storePassword(QString service, QString username, QString password) = 0;
+
+    /**
+     * @brief get a password from the Keyring
+     * @param service the service name
+     * @param username the account name
+     * @return the password (success=!isNull())
+     */
+    virtual QString getPassword(QString service, QString username) = 0;
+
+    /**
+     * @brief lookup a password
+     * @param service the service name
+     * @param username the account name
+     * @return wether the password is available
+     */
+    virtual bool hasPassword(QString service, QString username) = 0;
+
+    /**
+     * @brief get a list of all stored accounts.
+     * @param service the service name
+     * @return
+     */
+    virtual QStringList getStoredAccounts(QString service) = 0;
+
+protected:
+    /// fall back to StubKeyring if false
+    virtual bool isValid() { return false; }
+
+private:
+    static Keyring *m_instance;
+    static void destroy();
+};
+
+#endif // KEYRING_H

libsettings/src/keyring.cpp

@@ -0,0 +1,63 @@
+/* Copyright 2013 MultiMC Contributors
+ *
+ * Authors: Orochimarufan <orochimarufan.x3@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "include/keyring.h"
+
+#include "osutils.h"
+
+#include "stubkeyring.h"
+
+// system specific keyrings
+/*#if defined(OSX)
+class OSXKeychain;
+#define KEYRING OSXKeychain
+#elif defined(LINUX)
+class XDGKeyring;
+#define KEYRING XDGKeyring
+#elif defined(WINDOWS)
+class Win32Keystore;
+#define KEYRING Win32Keystore
+#else
+#pragma message Keyrings are not supported on your os. Falling back to the insecure StubKeyring
+#endif*/
+
+Keyring *Keyring::instance()
+{
+    if (m_instance == nullptr)
+    {
+#ifdef KEYRING
+        m_instance = new KEYRING();
+        if (!m_instance->isValid())
+        {
+            qWarning("Could not create SystemKeyring! falling back to StubKeyring.");
+            m_instance = new StubKeyring();
+        }
+#else
+        qWarning("Keyrings are not supported on your OS. Fallback StubKeyring is insecure!");
+        m_instance = new StubKeyring();
+#endif
+        atexit(Keyring::destroy);
+    }
+    return m_instance;
+}
+
+void Keyring::destroy()
+{
+    delete m_instance;
+}
+
+Keyring *Keyring::m_instance;

libsettings/src/stubkeyring.cpp

@@ -0,0 +1,96 @@
+/* Copyright 2013 MultiMC Contributors
+ *
+ * Authors: Orochimarufan <orochimarufan.x3@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "stubkeyring.h"
+
+#include <QStringList>
+
+// Scrambling
+// this is NOT SAFE, but it's not plain either.
+int scrambler = 0x9586309;
+
+QString scramble(QString in_)
+{
+    QByteArray in = in_.toUtf8();
+    QByteArray out;
+    for (int i = 0; i<in.length(); i++)
+        out.append(in.at(i) ^ scrambler);
+    return QString::fromUtf8(out);
+}
+
+inline QString base64(QString in)
+{
+    return QString(in.toUtf8().toBase64());
+}
+inline QString unbase64(QString in)
+{
+    return QString::fromUtf8(QByteArray::fromBase64(in.toLatin1()));
+}
+
+inline QString scramble64(QString in)
+{
+    return base64(scramble(in));
+}
+inline QString unscramble64(QString in)
+{
+    return scramble(unbase64(in));
+}
+
+// StubKeyring implementation
+inline QString generateKey(QString service, QString username)
+{
+    return QString("%1/%2").arg(base64(service)).arg(scramble64(username));
+}
+
+bool StubKeyring::storePassword(QString service, QString username, QString password)
+{
+    m_settings.setValue(generateKey(service, username), scramble64(password));
+    return true;
+}
+
+QString StubKeyring::getPassword(QString service, QString username)
+{
+    QString key = generateKey(service, username);
+    if (!m_settings.contains(key))
+        return QString();
+    return unscramble64(m_settings.value(key).toString());
+}
+
+inline bool StubKeyring::hasPassword(QString service, QString username)
+{
+    return m_settings.contains(generateKey(service, username));
+}
+
+QStringList StubKeyring::getStoredAccounts(QString service)
+{
+    service = base64(service).append('/');
+    QStringList out;
+    QStringList in(m_settings.allKeys());
+    QStringListIterator it(in);
+    while(it.hasNext())
+    {
+        QString c = it.next();
+        if (c.startsWith(service))
+            out << unscramble64(c.mid(service.length()));
+    }
+    return out;
+}
+
+StubKeyring::StubKeyring() :
+    m_settings(QSettings::UserScope, "Orochimarufan", "Keyring")
+{
+}

libsettings/src/stubkeyring.h

@@ -0,0 +1,42 @@
+/* Copyright 2013 MultiMC Contributors
+ *
+ * Authors: Orochimarufan <orochimarufan.x3@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef STUBKEYRING_H
+#define STUBKEYRING_H
+
+#include "include/keyring.h"
+
+#include <QSettings>
+
+class StubKeyring : public Keyring
+{
+    Q_OBJECT
+public:
+    virtual bool storePassword(QString service, QString username, QString password);
+    virtual QString getPassword(QString service, QString username);
+    virtual bool hasPassword(QString service, QString username);
+    virtual QStringList getStoredAccounts(QString service);
+
+private:
+    friend class Keyring;
+    explicit StubKeyring();
+    virtual bool isValid() { return true; }
+
+    QSettings m_settings;
+};
+
+#endif // STUBKEYRING_H