plasma-framework/remote/credentials.cpp

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/*
* Copyright © 2009 Rob Scheepmaker <r.scheepmaker@student.utwente.nl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License version 2 as
* published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "credentials.h"
#include "config-plasma.h"
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#include <QCryptographicHash>
#include <QObject>
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#if ENABLE_REMOTE_WIDGETS
#include <QtCrypto>
#endif
#include <kdebug.h>
#include <kstandarddirs.h>
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#include "authorizationmanager.h"
#define REQUIRED_FEATURES "rsa,sha1,pkey"
namespace Plasma {
class CredentialsPrivate {
public:
CredentialsPrivate()
{
}
CredentialsPrivate(const QString &id, const QString &name,
const QString &pemKey, bool isPrivateKey)
: id(id),
name(name)
{
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#if ENABLE_REMOTE_WIDGETS
if (!QCA::isSupported(REQUIRED_FEATURES)) {
kWarning() << "QCA doesn't support " << REQUIRED_FEATURES;
return;
}
if (isPrivateKey) {
privateKey = QCA::PrivateKey::fromPEM(pemKey);
publicKey = privateKey.toPublicKey();
} else {
publicKey = QCA::PublicKey::fromPEM(pemKey);
}
#endif
}
~CredentialsPrivate()
{
}
QString id;
QString name;
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#if ENABLE_REMOTE_WIDGETS
QCA::PublicKey publicKey;
QCA::PrivateKey privateKey;
#endif
};
Credentials::Credentials(const QString &id, const QString &name,
const QString &key, bool isPrivateKey)
: d(new CredentialsPrivate(id, name, key, isPrivateKey))
{
}
Credentials::Credentials()
: d(new CredentialsPrivate())
{
}
Credentials::Credentials(const Credentials &other)
: d(new CredentialsPrivate())
{
*d = *other.d;
}
Credentials::~Credentials()
{
delete d;
}
Credentials &Credentials::operator=(const Credentials &other)
{
*d = *other.d;
return *this;
}
Credentials Credentials::createCredentials(const QString &name)
{
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#if ENABLE_REMOTE_WIDGETS
if (!QCA::isSupported(REQUIRED_FEATURES)) {
kWarning() << "QCA doesn't support " << REQUIRED_FEATURES;
return Credentials();
}
QCA::KeyGenerator generator;
QCA::PrivateKey key = generator.createRSA(2048);
QString pemKey(key.toPublicKey().toPEM());
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QString id = QCryptographicHash::hash(pemKey.toAscii(), QCryptographicHash::Sha1);
return Credentials(id, name, key.toPEM(), true);
#else
return Credentials();
#endif
}
TrustLevel Credentials::trustLevel() const
{
/**
QString pemFile = KStandardDirs::locate("trustedkeys", id());
if (!pemFile.isEmpty()) {
QCA::PublicKey pubKey = QCA::PublicKey::fromPEMFile(pemFile);
if (pubKey == d->publicKey) {
return true;
}
}
*/
//Trust no one ;)
return UnknownTrusted;
}
bool Credentials::isValid() const
{
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#if ENABLE_REMOTE_WIDGETS
if (!QCA::isSupported(REQUIRED_FEATURES)) {
kWarning() << "QCA doesn't support " << REQUIRED_FEATURES;
return false;
}
if (d->publicKey.isNull()) {
return false;
} else {
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QString id = QCryptographicHash::hash(d->publicKey.toPEM().toAscii(), QCryptographicHash::Sha1);
return (id == d->id);
}
#else
#ifndef NDEBUG
kDebug() << "libplasma is compiled without support for remote widgets. Key invalid.";
#endif
return false;
#endif
}
QString Credentials::name() const
{
return d->name;
}
QString Credentials::id() const
{
return d->id;
}
bool Credentials::isValidSignature(const QByteArray &signature, const QByteArray &payload)
{
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#if ENABLE_REMOTE_WIDGETS
if (!QCA::isSupported(REQUIRED_FEATURES)) {
kWarning() << "QCA doesn't support " << REQUIRED_FEATURES;
return false;
}
if (d->publicKey.canVerify()) {
if (!isValid()) {
#ifndef NDEBUG
kDebug() << "Key is null?";
#endif
}
QCA::PublicKey publicKey = QCA::PublicKey::fromPEM(d->publicKey.toPEM());
publicKey.startVerify( QCA::EMSA3_MD5 );
publicKey.update(payload);
return ( publicKey.validSignature( signature ) );
} else {
#ifndef NDEBUG
kDebug() << "Can't verify?";
#endif
return false;
}
#else
return false;
#endif
}
bool Credentials::canSign() const
{
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#if ENABLE_REMOTE_WIDGETS
if (!QCA::isSupported(REQUIRED_FEATURES)) {
kWarning() << "QCA doesn't support " << REQUIRED_FEATURES;
return false;
}
return d->privateKey.canSign();
#else
return false;
#endif
}
QByteArray Credentials::signMessage(const QByteArray &message)
{
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#if ENABLE_REMOTE_WIDGETS
if(!QCA::isSupported(REQUIRED_FEATURES)) {
#ifndef NDEBUG
kDebug() << "RSA not supported";
#endif
return QByteArray();
} else if (canSign()) {
//QCA::PrivateKey privateKey = QCA::PrivateKey::fromPEM(d->privateKey.toPEM());
d->privateKey.startSign( QCA::EMSA3_MD5 );
d->privateKey.update( message );
QByteArray signature = d->privateKey.signature();
return signature;
} else {
return QByteArray();
}
#else
return QByteArray();
#endif
}
Credentials Credentials::toPublicCredentials() const
{
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#if ENABLE_REMOTE_WIDGETS
Credentials result(*this);
result.d->privateKey = QCA::PrivateKey();
return result;
#else
return Credentials();
#endif
}
QDataStream &operator<<(QDataStream &out, const Credentials &myObj)
{
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#if ENABLE_REMOTE_WIDGETS
if (!QCA::isSupported(REQUIRED_FEATURES)) {
kWarning() << "QCA doesn't support " << REQUIRED_FEATURES;
return out;
}
QString privateKeyPem;
QString publicKeyPem;
if (!myObj.d->privateKey.isNull()) {
privateKeyPem = myObj.d->privateKey.toPEM();
}
if (!myObj.d->publicKey.isNull()) {
publicKeyPem = myObj.d->publicKey.toPEM();
}
out << 1 << myObj.d->id << myObj.d->name << privateKeyPem << publicKeyPem;
#endif
return out;
}
QDataStream &operator>>(QDataStream &in, Credentials &myObj)
{
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#if ENABLE_REMOTE_WIDGETS
if (!QCA::isSupported(REQUIRED_FEATURES)) {
kWarning() << "QCA doesn't support " << REQUIRED_FEATURES;
return in;
}
QString privateKeyString;
QString publicKeyString;
uint version;
in >> version >> myObj.d->id >> myObj.d->name >> privateKeyString >> publicKeyString;
QCA::ConvertResult conversionResult;
if (!privateKeyString.isEmpty()) {
myObj.d->privateKey = QCA::PrivateKey::fromPEM(privateKeyString,
QByteArray(), &conversionResult);
}
if (!publicKeyString.isEmpty()) {
myObj.d->publicKey = QCA::PublicKey::fromPEM(publicKeyString, &conversionResult);
}
if (conversionResult != QCA::ConvertGood) {
#ifndef NDEBUG
kDebug() << "Unsuccessfull conversion of key?";
#endif
}
#endif
return in;
}
}