summaryrefslogtreecommitdiffstats
path: root/src/plugins/tls/shared/qsslsocket_mac_shared.cpp
blob: fba52fa1a81d4e7eb603471de84caa65310259db (plain)
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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Copyright (C) 2015 ownCloud Inc
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtNetwork module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <QtNetwork/private/qtlsbackend_p.h>

#include <QtNetwork/qsslcertificate.h>

#include <QtCore/qloggingcategory.h>
#include <QtCore/qglobal.h>
#include <QtCore/qdebug.h>


#ifdef Q_OS_MACOS

#include <QtCore/private/qcore_mac_p.h>

#include <CoreFoundation/CFArray.h>
#include <Security/Security.h>

#endif // Q_OS_MACOS

QT_BEGIN_NAMESPACE

Q_LOGGING_CATEGORY(lcX509, "qt.mac.shared.x509");

#ifdef Q_OS_MACOS
namespace {

bool hasTrustedSslServerPolicy(SecPolicyRef policy, CFDictionaryRef props) {
    QCFType<CFDictionaryRef> policyProps = SecPolicyCopyProperties(policy);
    // only accept certificates with policies for SSL server validation for now
    if (CFEqual(CFDictionaryGetValue(policyProps, kSecPolicyOid), kSecPolicyAppleSSL)) {
        CFBooleanRef policyClient;
        if (CFDictionaryGetValueIfPresent(policyProps, kSecPolicyClient, reinterpret_cast<const void**>(&policyClient)) &&
            CFEqual(policyClient, kCFBooleanTrue)) {
            return false; // no client certs
        }
        if (!CFDictionaryContainsKey(props, kSecTrustSettingsResult)) {
            // as per the docs, no trust settings result implies full trust
            return true;
        }
        CFNumberRef number = static_cast<CFNumberRef>(CFDictionaryGetValue(props, kSecTrustSettingsResult));
        SecTrustSettingsResult settingsResult;
        CFNumberGetValue(number, kCFNumberSInt32Type, &settingsResult);
        switch (settingsResult) {
        case kSecTrustSettingsResultTrustRoot:
        case kSecTrustSettingsResultTrustAsRoot:
            return true;
        default:
            return false;
        }
    }
    return false;
}

bool isCaCertificateTrusted(SecCertificateRef cfCert, int domain)
{
    QCFType<CFArrayRef> cfTrustSettings;
    OSStatus status = SecTrustSettingsCopyTrustSettings(cfCert, SecTrustSettingsDomain(domain), &cfTrustSettings);
    if (status == noErr) {
        CFIndex size = CFArrayGetCount(cfTrustSettings);
        // if empty, trust for everything (as per the Security Framework documentation)
        if (size == 0) {
            return true;
        } else {
            for (CFIndex i = 0; i < size; ++i) {
                CFDictionaryRef props = static_cast<CFDictionaryRef>(CFArrayGetValueAtIndex(cfTrustSettings, i));
                if (CFDictionaryContainsKey(props, kSecTrustSettingsPolicy)) {
                    if (hasTrustedSslServerPolicy((SecPolicyRef)CFDictionaryGetValue(props, kSecTrustSettingsPolicy), props))
                        return true;
                }
            }
        }
    }

    return false;
}

bool canDERBeParsed(CFDataRef derData, const QSslCertificate &qtCert)
{
    // We are observing certificates, that while accepted when we copy them
    // from the keychain(s), later give us 'Failed to create SslCertificate
    // from QSslCertificate'. It's interesting to know at what step the failure
    // occurred. Let's check it and skip it below if it's not valid.

    auto checkDer = [](CFDataRef derData, const char *source)
    {
        Q_ASSERT(source);
        Q_ASSERT(derData);

        const auto cfLength = CFDataGetLength(derData);
        if (cfLength <= 0) {
            qCWarning(lcX509) << source << "returned faulty DER data with invalid length.";
            return false;
        }

        QCFType<SecCertificateRef> secRef = SecCertificateCreateWithData(nullptr, derData);
        if (!secRef) {
            qCWarning(lcX509) << source << "returned faulty DER data which cannot be parsed back.";
            return false;
        }
        return true;
    };

    if (!checkDer(derData, "SecCertificateCopyData")) {
        qCDebug(lcX509) << "Faulty QSslCertificate is:" << qtCert;// Just in case we managed to parse something.
        return false;
    }

    // Generic parser failed?
    if (qtCert.isNull()) {
        qCWarning(lcX509, "QSslCertificate failed to parse DER");
        return false;
    }

    const QCFType<CFDataRef> qtDerData = qtCert.toDer().toCFData();
    if (!checkDer(qtDerData, "QSslCertificate")) {
        qCWarning(lcX509) << "Faulty QSslCertificate is:" << qtCert;
        return false;
    }

    return true;
}

} // unnamed namespace
#endif // Q_OS_MACOS

namespace QTlsPrivate {
QList<QSslCertificate> systemCaCertificates()
{
    QList<QSslCertificate> systemCerts;
    // SecTrustSettingsCopyCertificates is not defined on iOS.
#ifdef Q_OS_MACOS
    // iterate through all enum members, order:
    // kSecTrustSettingsDomainUser, kSecTrustSettingsDomainAdmin, kSecTrustSettingsDomainSystem
    for (int dom = kSecTrustSettingsDomainUser; dom <= int(kSecTrustSettingsDomainSystem); dom++) {
        QCFType<CFArrayRef> cfCerts;
        OSStatus status = SecTrustSettingsCopyCertificates(SecTrustSettingsDomain(dom), &cfCerts);
        if (status == noErr) {
            const CFIndex size = CFArrayGetCount(cfCerts);
            for (CFIndex i = 0; i < size; ++i) {
                SecCertificateRef cfCert = (SecCertificateRef)CFArrayGetValueAtIndex(cfCerts, i);
                QCFType<CFDataRef> derData = SecCertificateCopyData(cfCert);
                if (isCaCertificateTrusted(cfCert, dom)) {
                    if (derData) {
                        const auto newCert = QSslCertificate(QByteArray::fromCFData(derData), QSsl::Der);
                        if (!canDERBeParsed(derData, newCert)) {
                            // Last attempt to get some information about the certificate:
                            CFShow(cfCert);
                            continue;
                        }
                        systemCerts << newCert;
                    } else {
                        // "Returns NULL if the data passed in the certificate parameter
                        // is not a valid certificate object."
                        qCWarning(lcX509, "SecCertificateCopyData returned invalid DER data (nullptr).");
                    }
                }
            }
        }
    }
#endif
    return systemCerts;
}
} // namespace QTlsPrivate

QT_END_NAMESPACE