http://labs.qt.nokia.com/2011/09/02/what-the-diginotar-security-breach-means-for-qt-users/
http://labs.qt.nokia.com/2011/09/07/what-the-diginotar-security-breach-means-for-qt-users-continued/

Original Author:Nokia
Upstream-Status: Integrated in upcoming versions

diff --git a/src/network/ssl/qsslcertificate.cpp b/src/network/ssl/qsslcertificate.cpp
index 328c5c2..1ae98f4 100644
--- a/src/network/ssl/qsslcertificate.cpp
+++ b/src/network/ssl/qsslcertificate.cpp
@@ -803,22 +803,47 @@ QList<QSslCertificate> QSslCertificatePrivate::certificatesFromDer(const QByteAr
 // These certificates are known to be fraudulent and were created during the comodo
 // compromise. See http://www.comodo.com/Comodo-Fraud-Incident-2011-03-23.html
 static const char *certificate_blacklist[] = {
-    "04:7e:cb:e9:fc:a5:5f:7b:d0:9e:ae:36:e1:0c:ae:1e",
-    "f5:c8:6a:f3:61:62:f1:3a:64:f5:4f:6d:c9:58:7c:06",
-    "d7:55:8f:da:f5:f1:10:5b:b2:13:28:2b:70:77:29:a3",
-    "39:2a:43:4f:0e:07:df:1f:8a:a3:05:de:34:e0:c2:29",
-    "3e:75:ce:d4:6b:69:30:21:21:88:30:ae:86:a8:2a:71",
-    "e9:02:8b:95:78:e4:15:dc:1a:71:0a:2b:88:15:44:47",
-    "92:39:d5:34:8f:40:d1:69:5a:74:54:70:e1:f2:3f:43",
-    "b0:b7:13:3e:d0:96:f9:b5:6f:ae:91:c8:74:bd:3a:c0",
-    "d8:f3:5f:4e:b7:87:2b:2d:ab:06:92:e3:15:38:2f:b0",
+    "04:7e:cb:e9:fc:a5:5f:7b:d0:9e:ae:36:e1:0c:ae:1e", "mail.google.com", // Comodo
+    "f5:c8:6a:f3:61:62:f1:3a:64:f5:4f:6d:c9:58:7c:06", "www.google.com", // Comodo
+    "d7:55:8f:da:f5:f1:10:5b:b2:13:28:2b:70:77:29:a3", "login.yahoo.com", // Comodo
+    "39:2a:43:4f:0e:07:df:1f:8a:a3:05:de:34:e0:c2:29", "login.yahoo.com", // Comodo
+    "3e:75:ce:d4:6b:69:30:21:21:88:30:ae:86:a8:2a:71", "login.yahoo.com", // Comodo
+    "e9:02:8b:95:78:e4:15:dc:1a:71:0a:2b:88:15:44:47", "login.skype.com", // Comodo
+    "92:39:d5:34:8f:40:d1:69:5a:74:54:70:e1:f2:3f:43", "addons.mozilla.org", // Comodo
+    "b0:b7:13:3e:d0:96:f9:b5:6f:ae:91:c8:74:bd:3a:c0", "login.live.com", // Comodo
+    "d8:f3:5f:4e:b7:87:2b:2d:ab:06:92:e3:15:38:2f:b0", "global trustee", // Comodo
+
+    "05:e2:e6:a4:cd:09:ea:54:d6:65:b0:75:fe:22:a2:56", "*.google.com", // leaf certificate issued by DigiNotar
+    "0c:76:da:9c:91:0c:4e:2c:9e:fe:15:d0:58:93:3c:4c", "DigiNotar Root CA", // DigiNotar root
+    "f1:4a:13:f4:87:2b:56:dc:39:df:84:ca:7a:a1:06:49", "DigiNotar Services CA", // DigiNotar intermediate signed by DigiNotar Root
+    "36:16:71:55:43:42:1b:9d:e6:cb:a3:64:41:df:24:38", "DigiNotar Services 1024 CA", // DigiNotar intermediate signed by DigiNotar Root
+    "0a:82:bd:1e:14:4e:88:14:d7:5b:1a:55:27:be:bf:3e", "DigiNotar Root CA G2", // other DigiNotar Root CA
+    "a4:b6:ce:e3:2e:d3:35:46:26:3c:b3:55:3a:a8:92:21", "CertiID Enterprise Certificate Authority", // DigiNotar intermediate signed by "DigiNotar Root CA G2"
+    "5b:d5:60:9c:64:17:68:cf:21:0e:35:fd:fb:05:ad:41", "DigiNotar Qualified CA", // DigiNotar intermediate signed by DigiNotar Root
+
+    "1184640176",                                      "DigiNotar Services 1024 CA", // DigiNotar intermediate cross-signed by Entrust
+    "120000525",                                       "DigiNotar Cyber CA", // DigiNotar intermediate cross-signed by CyberTrust
+    "120000505",                                       "DigiNotar Cyber CA", // DigiNotar intermediate cross-signed by CyberTrust
+    "120000515",                                       "DigiNotar Cyber CA", // DigiNotar intermediate cross-signed by CyberTrust
+    "20015536",                                        "DigiNotar PKIoverheid CA Overheid en Bedrijven", // DigiNotar intermediate cross-signed by the Dutch government
+    "20001983",                                        "DigiNotar PKIoverheid CA Organisatie - G2", // DigiNotar intermediate cross-signed by the Dutch government
+    "d6:d0:29:77:f1:49:fd:1a:83:f2:b9:ea:94:8c:5c:b4", "DigiNotar Extended Validation CA", // DigiNotar intermediate signed by DigiNotar EV Root
+    "1e:7d:7a:53:3d:45:30:41:96:40:0f:71:48:1f:45:04", "DigiNotar Public CA 2025", // DigiNotar intermediate
+//    "(has not been seen in the wild so far)", "DigiNotar Public CA - G2", // DigiNotar intermediate
+//    "(has not been seen in the wild so far)", "Koninklijke Notariele Beroepsorganisatie CA", // compromised during DigiNotar breach
+//    "(has not been seen in the wild so far)", "Stichting TTP Infos CA," // compromised during DigiNotar breach
+    "1184640175", "DigiNotar Root CA", // DigiNotar intermediate cross-signed by Entrust
+    "1184644297", "DigiNotar Root CA", // DigiNotar intermediate cross-signed by Entrust
     0
 };
 
 bool QSslCertificatePrivate::isBlacklisted(const QSslCertificate &certificate)
 {
     for (int a = 0; certificate_blacklist[a] != 0; a++) {
-        if (certificate.serialNumber() == certificate_blacklist[a])
+        QString blacklistedCommonName = QString::fromUtf8(certificate_blacklist[(a+1)]);
+        if (certificate.serialNumber() == certificate_blacklist[a++] &&
+            (certificate.subjectInfo(QSslCertificate::CommonName) == blacklistedCommonName ||
+             certificate.issuerInfo(QSslCertificate::CommonName) == blacklistedCommonName))
             return true;
     }
     return false;
diff --git a/src/network/ssl/qsslsocket_openssl.cpp b/src/network/ssl/qsslsocket_openssl.cpp
index 141d80a..b8e6c4c 100644
--- a/src/network/ssl/qsslsocket_openssl.cpp
+++ b/src/network/ssl/qsslsocket_openssl.cpp
@@ -1193,12 +1193,16 @@ bool QSslSocketBackendPrivate::startHandshake()
     X509 *x509 = q_SSL_get_peer_certificate(ssl);
     configuration.peerCertificate = QSslCertificatePrivate::QSslCertificate_from_X509(x509);
     q_X509_free(x509);
-    if (QSslCertificatePrivate::isBlacklisted(configuration.peerCertificate)) {
-        q->setErrorString(QSslSocket::tr("The peer certificate is blacklisted"));
-        q->setSocketError(QAbstractSocket::SslHandshakeFailedError);
-        emit q->error(QAbstractSocket::SslHandshakeFailedError);
-        plainSocket->disconnectFromHost();
-        return false;
+
+    // check the whole chain for blacklisting (including root, as we check for subjectInfo and issuer)
+    foreach (const QSslCertificate &cert, configuration.peerCertificateChain) {
+        if (QSslCertificatePrivate::isBlacklisted(cert)) {
+            q->setErrorString(QSslSocket::tr("The peer certificate is blacklisted"));
+            q->setSocketError(QAbstractSocket::SslHandshakeFailedError);
+            emit q->error(QAbstractSocket::SslHandshakeFailedError);
+            plainSocket->disconnectFromHost();
+            return false;
+        }
     }
 
     // Start translating errors.
