From: Denys Dmytriyenko Date: Wed, 30 Mar 2011 21:19:55 +0000 (-0400) Subject: qt4: security advisory - blacklist fraudulent comodo certificates X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=61eeeec1224c4f974f9185c2b93eeb19d13938af;p=openembedded.git qt4: security advisory - blacklist fraudulent comodo certificates Security advisory: Blacklist fraudulent certificates. More info is in the patch and at the following links: http://www.comodo.com/Comodo-Fraud-Incident-2011-03-23.html http://qt.nokia.com/files/qt-patches/blacklist-fraudulent-comodo-certificates-patch.diff/view Signed-off-by: Denys Dmytriyenko Acked-by : Eric Benard --- diff --git a/recipes/qt4/files/blacklist-fraudulent-comodo-certificates-patch.diff b/recipes/qt4/files/blacklist-fraudulent-comodo-certificates-patch.diff new file mode 100644 index 0000000000..00faf75932 --- /dev/null +++ b/recipes/qt4/files/blacklist-fraudulent-comodo-certificates-patch.diff @@ -0,0 +1,134 @@ +Security advisory: Fraudulent certificates + +Background: + +Recently a group of people managed to get fraudulent SSL certificates signed +by a Certificate Authority (CA). + +These certificates potentially enable their owners to pretend to be other +entities on the Web; the attackers can present valid certificates for e.g. +mail.google.com, login.yahoo.com and login.live.com, among others. + +The patch below solves this problem by blacklisting those fake certificates +and aborting an SSL handshake with entities that present these certificates. +The patch applies to all 4.6 and 4.7 versions, and should be applied to all Qt +4.6.x and 4.7.x versions; upcoming Qt releases will contain a fix for this +problem. + +More technical background: + +In order to trick a user into establishing an SSL connection to a site using +one of those fake certificates, in addition to controlling the certificate, an +attacker would need to either control the DNS server used by the victim, or +have control over a proxy that the victim uses. That way, the attacker could +trick the victim to connect to the attacker?s site and then present the user +with a valid certificate. + +One obvious question now is: Should those certificates not just be revoked, +which would solve the problem? + +First, they have been revoked by the affected Certificate Authority (see above +link). + +However, the problem in this case, and probably part of the reason why most +browser vendors release new versions blacklisting those certificates, is that +by default browsers do not treat invalid responses from an OCSP server (a +server used for checking the revocation status of a certificate) as fatal, and +will allow the SSL connection to proceed anyway. Qt itself does not support +OCSP yet, which makes blacklisting the certificates the only valid option (now +would be a good moment to vote on the task for implementing OCSP in Qt); since +Qt is relying on the system root certificates since version 4.7, it cannot +control the root certificates that Qt trusts automatically anymore. + +http://www.comodo.com/Comodo-Fraud-Incident-2011-03-23.html +http://qt.nokia.com/files/qt-patches/blacklist-fraudulent-comodo-certificates-patch.diff/view + +diff --git a/src/network/ssl/qsslcertificate.cpp b/src/network/ssl/qsslcertificate.cpp +index 618ac79..a5cdf01 100644 +--- a/src/network/ssl/qsslcertificate.cpp ++++ b/src/network/ssl/qsslcertificate.cpp +@@ -219,17 +219,19 @@ bool QSslCertificate::isNull() const + Returns true if this certificate is valid; otherwise returns + false. + +- Note: Currently, this function only checks that the current ++ Note: Currently, this function checks that the current + data-time is within the date-time range during which the +- certificate is considered valid. No other checks are +- currently performed. ++ certificate is considered valid, and checks that the ++ certificate is not in a blacklist of fraudulent certificates. + + \sa isNull() + */ + bool QSslCertificate::isValid() const + { + const QDateTime currentTime = QDateTime::currentDateTime(); +- return currentTime >= d->notValidBefore && currentTime <= d->notValidAfter; ++ return currentTime >= d->notValidBefore && ++ currentTime <= d->notValidAfter && ++ ! QSslCertificatePrivate::isBlacklisted(*this); + } + + /*! +@@ -798,6 +800,30 @@ QList QSslCertificatePrivate::certificatesFromDer(const QByteAr + return certificates; + } + ++// 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", ++ 0 ++}; ++ ++bool QSslCertificatePrivate::isBlacklisted(const QSslCertificate &certificate) ++{ ++ for (int a = 0; certificate_blacklist[a] != 0; a++) { ++ if (certificate.serialNumber() == certificate_blacklist[a]) ++ return true; ++ } ++ return false; ++} ++ + #ifndef QT_NO_DEBUG_STREAM + QDebug operator<<(QDebug debug, const QSslCertificate &certificate) + { +diff --git a/src/network/ssl/qsslcertificate_p.h b/src/network/ssl/qsslcertificate_p.h +index cdceb0f..1ce33d3 100644 +--- a/src/network/ssl/qsslcertificate_p.h ++++ b/src/network/ssl/qsslcertificate_p.h +@@ -96,6 +96,7 @@ public: + static QSslCertificate QSslCertificate_from_X509(X509 *x509); + static QList certificatesFromPem(const QByteArray &pem, int count = -1); + static QList certificatesFromDer(const QByteArray &der, int count = -1); ++ static bool isBlacklisted(const QSslCertificate &certificate); + + friend class QSslSocketBackendPrivate; + +diff --git a/src/network/ssl/qsslsocket_openssl.cpp b/src/network/ssl/qsslsocket_openssl.cpp +index 0866534..2427193 100644 +--- a/src/network/ssl/qsslsocket_openssl.cpp ++++ b/src/network/ssl/qsslsocket_openssl.cpp +@@ -1193,6 +1193,13 @@ 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; ++ } + + // Start translating errors. + QList errors; diff --git a/recipes/qt4/qt-4.6.3.inc b/recipes/qt4/qt-4.6.3.inc index 5b91116a77..77c5cf69d4 100644 --- a/recipes/qt4/qt-4.6.3.inc +++ b/recipes/qt4/qt-4.6.3.inc @@ -1,11 +1,14 @@ DEFAULT_PREFERENCE = "-1" +LICENSE = "LGPLv2.1 GPLv3" FILESPATHPKG .= ":qt-${PV}" SRC_URI = "ftp://ftp.trolltech.com/qt/source/qt-everywhere-opensource-src-${PV}.tar.gz \ + file://blacklist-fraudulent-comodo-certificates-patch.diff \ file://0001-cross-compile.patch \ file://0002-fix-resinit-declaration.patch \ file://0004-no-qmake.patch \ + file://hack-out-pg_config.patch \ file://0006-freetype-host-includes.patch \ file://0008-qt-lib-infix.patch \ file://0009-support-2bpp.patch \ @@ -64,10 +67,5 @@ do_install_append() { fi } -LICENSE = "LGPLv2.1 GPLv3" -SRC_URI += " \ - file://hack-out-pg_config.patch" - SRC_URI[md5sum] = "5c69f16d452b0bb3d44bc3c10556c072" SRC_URI[sha256sum] = "f4e0ada8d4d516bbb8600a3ee7d9046c9c79e38cd781df9ffc46d8f16acd1768" - diff --git a/recipes/qt4/qt-4.7.2.inc b/recipes/qt4/qt-4.7.2.inc index 282bc82e09..e6a7b9023d 100644 --- a/recipes/qt4/qt-4.7.2.inc +++ b/recipes/qt4/qt-4.7.2.inc @@ -5,8 +5,9 @@ FILESPATHPKG =. "qt-${PV}:" SRC_URI = "\ ftp://ftp.trolltech.com/qt/source/qt-everywhere-opensource-src-${PV}.tar.gz \ + file://blacklist-fraudulent-comodo-certificates-patch.diff \ file://0004-no-qmake.patch \ - file://hack-out-pg2-4.7.0.patch \ + file://hack-out-pg2-4.7.0.patch \ file://0006-freetype-host-includes.patch \ file://0001-Added-Openembedded-crossarch-option.patch \ file://0010-phonon-gstreamer-rgb-endianess.patch \ diff --git a/recipes/qt4/qt4-embedded_4.6.3.bb b/recipes/qt4/qt4-embedded_4.6.3.bb index 13f3f00edf..fe49fdba8f 100644 --- a/recipes/qt4/qt4-embedded_4.6.3.bb +++ b/recipes/qt4/qt4-embedded_4.6.3.bb @@ -1,6 +1,6 @@ require qt4-embedded.inc -PR = "${INC_PR}.1" +PR = "${INC_PR}.2" QT_CONFIG_FLAGS_append_armv6 = " -no-neon " diff --git a/recipes/qt4/qt4-embedded_4.7.2.bb b/recipes/qt4/qt4-embedded_4.7.2.bb index 1cd43a664b..7e3d4b8325 100644 --- a/recipes/qt4/qt4-embedded_4.7.2.bb +++ b/recipes/qt4/qt4-embedded_4.7.2.bb @@ -2,7 +2,7 @@ DEFAULT_PREFERENCE = "-1" require qt4-embedded.inc -PR = "${INC_PR}.0" +PR = "${INC_PR}.1" QT_CONFIG_FLAGS_append_armv6 = " -no-neon "