From 15253d1995ea49b114ef5c627e15b661dbd602b2 Mon Sep 17 00:00:00 2001
From: "Javier S. Pedro" <maemo@javispedro.com>
Date: Sun, 30 Sep 2012 19:41:17 +0200
Subject: add some trivial authentication

---
 distfoldd/agent.cc | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 62 insertions(+), 3 deletions(-)

(limited to 'distfoldd/agent.cc')

diff --git a/distfoldd/agent.cc b/distfoldd/agent.cc
index a718230..8baa85b 100644
--- a/distfoldd/agent.cc
+++ b/distfoldd/agent.cc
@@ -1,3 +1,5 @@
+#include <QtCrypto>
+
 #include "agent.h"
 
 #ifdef Q_OS_UNIX
@@ -5,8 +7,8 @@
 #include <utime.h>
 #endif
 
-Agent::Agent(QSslSocket *socket, const QDir& dir, SyncFlags flags, QObject *parent) :
-    QObject(parent), _dir(dir), _subPath("/"), _flags(flags), _socket(socket)
+Agent::Agent(QSslSocket *socket, const QDir& dir, const QString& passwd, SyncFlags flags, QObject *parent) :
+    QObject(parent), _dir(dir), _subPath("/"), _passwd(passwd), _flags(flags), _socket(socket)
 {
 	connect(_socket, SIGNAL(readyRead()), SLOT(handleDataAvailable()));
 	connect(_socket, SIGNAL(sslErrors(QList<QSslError>)), SLOT(handleSslErrors(QList<QSslError>)));
@@ -73,7 +75,7 @@ bool Agent::equalDateTime(const QDateTime& dt1, const QDateTime& dt2)
 
 void Agent::setLocalFileDateTime(const QString &path, const QDateTime &dt)
 {
-#ifdef Q_OS_UNIX
+#if defined(Q_OS_UNIX)
 	const char *filename = path.toLocal8Bit().constData();
 	struct utimbuf times;
 	times.actime = dt.toTime_t();
@@ -82,6 +84,8 @@ void Agent::setLocalFileDateTime(const QString &path, const QDateTime &dt)
 	if (rc != 0) {
 		qWarning() << "Could not set local mtime of" << path;
 	}
+#elif defined(Q_OS_WIN32)
+	// TODO SetFileAttributes, SetFileTime
 #endif
 }
 
@@ -135,6 +139,61 @@ bool Agent::morePathDepthThan(const QString& s1, const QString& s2)
 	return d1 > d2;
 }
 
+QByteArray Agent::encodeHelloMessage(const QByteArray& client_challenge)
+{
+	QByteArray ba(sizeof(quint32), '\0');
+	quint32 *p = reinterpret_cast<quint32*>(ba.data());
+	*p = PROTO_CURRENT;
+	ba.append(client_challenge);
+	return ba;
+}
+
+Agent::ProtoVersion Agent::decodeHelloMessage(const QByteArray& ba, QByteArray *client_challenge)
+{
+	if (ba.size() < static_cast<int>(sizeof(quint32))) return PROTO_BAD;
+	const quint32 *p = reinterpret_cast<const quint32*>(ba.constData());
+
+	switch (*p) {
+	case PROTO_1:
+		*client_challenge = ba.mid(sizeof(quint32));
+		return PROTO_1;
+	default:
+		return PROTO_BAD;
+	}
+}
+
+QByteArray Agent::hmacSha1(const QByteArray& key, const QByteArray& message)
+{
+	QCA::MessageAuthenticationCode mac("hmac(sha1)", QCA::SymmetricKey(key));
+	mac.update(message);
+	return mac.final().toByteArray();
+}
+
+QByteArray Agent::generateChallenge()
+{
+	const int challenge_size = 10;
+	return QCA::Random::randomArray(challenge_size).toByteArray();
+}
+
+QByteArray Agent::generateChallengeResponse(const QByteArray& server_challenge, const QByteArray& client_challenge)
+{
+	return hmacSha1(_passwd.toUtf8(), server_challenge + client_challenge);
+}
+
+QByteArray Agent::encodeAuthReply(AuthResult result)
+{
+	QByteArray ba(sizeof(quint8), static_cast<char>(result));
+	return ba;
+}
+
+Agent::AuthResult Agent::decodeAuthReply(const QByteArray& ba)
+{
+	if (ba.size() != 1) return AUTH_FAILED;
+	const quint8 *p = reinterpret_cast<const quint8*>(ba.constData());
+
+	return static_cast<AuthResult>(*p);
+}
+
 QFileInfoList Agent::scanFiles(const QDir& dir)
 {
 	QFileInfoList all;
-- 
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