1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/****************************************************************************
**
** Copyright (C) 2019 Luxoft Sweden AB
** Copyright (C) 2018 Pelagicore AG
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Luxoft Application Manager.
**
** $QT_BEGIN_LICENSE:LGPL-QTAS$
** Commercial License Usage
** Licensees holding valid commercial Qt Automotive Suite licenses may use
** this file in accordance with the commercial license agreement provided
** with the Software or, alternatively, in accordance with the terms
** contained in a written agreement between you and The Qt Company. For
** licensing terms and conditions see https://www.qt.io/terms-conditions.
** For further information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
** SPDX-License-Identifier: LGPL-3.0
**
****************************************************************************/
#include <QDebug>
#include <QFileInfo>
#include <QPointer>
#include <QDBusConnection>
#include <QDBusConnectionInterface>
#include <QDBusMessage>
#include <QDBusContext>
#include <QDBusAbstractAdaptor>
#include <QMetaMethod>
#include <algorithm>
#include "utilities.h"
#include "dbuspolicy.h"
#include "applicationmanager.h"
QT_BEGIN_NAMESPACE_AM
struct DBusPolicyEntry
{
QList<uint> m_uids;
QStringList m_executables;
QStringList m_capabilities;
};
static QMap<QPointer<QDBusAbstractAdaptor>, QMap<QByteArray, DBusPolicyEntry> > policies;
bool DBusPolicy::add(QDBusAbstractAdaptor *dbusAdaptor, const QVariantMap &yamlFragment)
{
QMap<QByteArray, DBusPolicyEntry> result;
const QMetaObject *mo = dbusAdaptor->metaObject();
for (auto it = yamlFragment.cbegin(); it != yamlFragment.cend(); ++it) {
const QByteArray func = it.key().toLocal8Bit();
bool found = false;
for (int mi = mo->methodOffset(); mi < mo->methodCount(); ++mi) {
if (mo->method(mi).name() == func) {
found = true;
break;
}
}
if (!found)
return false;
const QVariantMap &policy = it->toMap();
DBusPolicyEntry dbp;
bool ok;
const QVariantList uidList = policy.value(qSL("uids")).toList();
for (const QVariant &v : uidList) {
uint uid = v.toUInt(&ok);
if (ok)
dbp.m_uids << uid;
}
std::sort(dbp.m_uids.begin(), dbp.m_uids.end());
dbp.m_executables = variantToStringList(policy.value(qSL("executables")));
dbp.m_executables.sort();
dbp.m_capabilities = variantToStringList(policy.value(qSL("capabilities")));
dbp.m_capabilities.sort();
result.insert(func, dbp);
}
policies.insert(QPointer<QDBusAbstractAdaptor>(dbusAdaptor), result);
return true;
}
bool DBusPolicy::check(QDBusAbstractAdaptor *dbusAdaptor, const QByteArray &function)
{
#if !defined(Q_OS_UNIX)
Q_UNUSED(dbusAdaptor)
Q_UNUSED(function)
return true;
#else
if (!dbusAdaptor)
return false;
QObject *realObject = dbusAdaptor->parent();
if (!realObject)
return false;
QDBusContext *dbusContext = reinterpret_cast<QDBusContext *>(realObject->qt_metacast("QDBusContext"));
if (!dbusContext)
return false;
if (!dbusContext->calledFromDBus())
return false;
auto ia = policies.constFind(QPointer<QDBusAbstractAdaptor>(dbusAdaptor));
if (ia == policies.cend())
return false;
auto ip = (*ia).find(function);
if (ip == (*ia).cend())
return true;
try {
uint pid = uint(-1);
if (!ip->m_capabilities.isEmpty()) {
pid = dbusContext->connection().interface()->servicePid(dbusContext->message().service());
QStringList appCaps = ApplicationManager::instance()->capabilities(ApplicationManager::instance()->identifyApplication(pid));
bool match = false;
for (const QString &cap : ip->m_capabilities)
match = match && std::binary_search(appCaps.cbegin(), appCaps.cend(), cap);
if (!match)
throw "insufficient capabilities";
}
if (!ip->m_executables.isEmpty()) {
# if defined(Q_OS_LINUX)
if (pid == uint(-1))
pid = dbusContext->connection().interface()->servicePid(dbusContext->message().service());
QString executable = QFileInfo(qSL("/proc/") + QString::number(pid) + qSL("/exe")).symLinkTarget();
if (executable.isEmpty())
throw "cannot get executable";
if (std::binary_search(ip->m_executables.cbegin(), ip->m_executables.cend(), executable))
throw "executable blocked";
# else
throw false;
# endif // defined(Q_OS_LINUX)
}
if (!ip->m_uids.isEmpty()) {
uint uid = dbusContext->connection().interface()->serviceUid(dbusContext->message().service());
if (std::binary_search(ip->m_uids.cbegin(), ip->m_uids.cend(), uid))
throw "uid blocked";
}
return true;
} catch (const char *msg) {
dbusContext->sendErrorReply(QDBusError::AccessDenied, QString::fromLatin1("Protected function call (%1)").arg(qL1S(msg)));
return false;
}
#endif // !defined(Q_OS_UNIX)
}
QT_END_NAMESPACE_AM
|
