service/pam: add pam service

src/services/pam/conversation.hpp

@@ -0,0 +1,95 @@
+#pragma once
+
+#include <utility>
+
+#include <qmutex.h>
+#include <qobject.h>
+#include <qqmlintegration.h>
+#include <qthread.h>
+#include <qtmetamacros.h>
+#include <qwaitcondition.h>
+#include <security/pam_appl.h>
+
+/// The result of an authentication.
+class PamResult: public QObject {
+	Q_OBJECT;
+	QML_ELEMENT;
+	QML_SINGLETON;
+
+public:
+	enum Enum {
+		/// Authentication was successful.
+		Success = 0,
+		/// Authentication failed.
+		Failed = 1,
+		/// An error occurred while trying to authenticate.
+		Error = 2,
+		/// The authentication method ran out of tries and should not be used again.
+		MaxTries = 3,
+		// The account has expired.
+		// Expired  4,
+		// Permission denied.
+		// PermissionDenied  5,
+	};
+	Q_ENUM(Enum);
+
+	Q_INVOKABLE static QString toString(PamResult::Enum value);
+};
+
+/// An error that occurred during an authentication.
+class PamError: public QObject {
+	Q_OBJECT;
+	QML_ELEMENT;
+	QML_SINGLETON;
+
+public:
+	enum Enum {
+		/// Failed to initiate the pam connection.
+		ConnectionFailed = 1,
+		/// Failed to try to authenticate the user.
+		/// This is not the same as the user failing to authenticate.
+		TryAuthFailed = 2,
+	};
+	Q_ENUM(Enum);
+
+	Q_INVOKABLE static QString toString(PamError::Enum value);
+};
+
+class PamConversation: public QThread {
+	Q_OBJECT;
+
+public:
+	explicit PamConversation(QString config, QString configDir, QString user)
+	    : config(std::move(config))
+	    , configDir(std::move(configDir))
+	    , user(std::move(user)) {}
+
+public:
+	void run() override;
+
+	void abort();
+	void respond(QString response);
+
+signals:
+	void completed(PamResult::Enum result);
+	void error(PamError::Enum error);
+	void message(QString message, bool messageChanged, bool isError, bool responseRequired);
+
+private:
+	static int conversation(
+	    int msgCount,
+	    const pam_message** msgArray,
+	    pam_response** responseArray,
+	    void* appdata
+	);
+
+	QString config;
+	QString configDir;
+	QString user;
+
+	QMutex wakeMutex;
+	QWaitCondition waker;
+	bool mAbort = false;
+	bool hasResponse = false;
+	QString response;
+};