Zu sicher

Beachte: Update des Beitrags!

Nach den Anpassungen der Apache Configuration in Folge des Poodle Bugs erhielt ich zu Beginn der Woche eine Rückmeldung einer Vista Nutzerin aus dem Kollegium, dass sie nicht mehr auf unsere Seiten zugreifen könne. Ich nahm das zuerst nicht weiter ernst, tippte auf lokale Probleme. Dann stellte ich unter Cubian X fest, dass Chromium nur noch einen 113er Fehler anzeigte, der für

ERR_SSL_VERSION_OR_CIPHER_MISMATCH

steht und Iceweasel merkte an

ssl_error_no_cypher_overlap

Diverse Browser unter Android 4.0.3 (Lightning, Tint Browser, Zirco) wollten ebenfalls nicht mehr meine eigenen HTTPS verschlüsselten Seiten aufrufen. Während unter Android der Firefox noch einsetzbar war, so ging auf meinem Spielkistchen mit Cubian X gar nichts mehr. Die Software auf diesem System lässt sich nicht einfach aktualisieren – meine Apache-Konfiguration war für das Ding schlicht „zu sicher“.

Ich kam dann irgendwann auf Idee, die unterstützten Cipher Suiten miteinander zu vergleichen. Das geht direkt bei Qualys SSL Labs – oder für den Browser auch hier: https://cc.dcsec.uni-hannover.de/check . Die Schuppen fielen dann endlich von den Augen.

Sichere Konfiguration

Eintrag:

SSLProtocol all -SSLv2 -SSLv3

SSLCipherSuite ALL:!ADH:RC4+RSA:+HIGH:+MEDIUM:!LOW:!SSLv2:!SSLv3:!EXPORT

Ergebnis unter Debian:

kvfgnet_debianssl

Unterstützte Browsersuiten:

Handshake Simulation
Android 2.3.7   No SNI 2 Protocol or cipher suite mismatch Fail3
Android 4.0.4 Protocol or cipher suite mismatch Fail3
Android 4.1.1 Protocol or cipher suite mismatch Fail3
Android 4.2.2 Protocol or cipher suite mismatch Fail3
Android 4.3 Protocol or cipher suite mismatch Fail3
Android 4.4.2 TLS 1.2 TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030)   FS 256
BingBot Dec 2013   No SNI 2 Protocol or cipher suite mismatch Fail3
BingPreview Jun 2014 Protocol or cipher suite mismatch Fail3
Chrome 37 / OS X  R TLS 1.2 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (0xc02f)   FS 128
Firefox 24.2.0 ESR / Win 7 Protocol or cipher suite mismatch Fail3
Firefox 32 / OS X  R TLS 1.2 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (0xc02f)   FS 128
Googlebot Jun 2014 Protocol or cipher suite mismatch Fail3
IE 6 / XP   No FS 1   No SNI 2 Protocol or cipher suite mismatch Fail3
IE 7 / Vista Protocol or cipher suite mismatch Fail3
IE 8 / XP   No FS 1   No SNI 2 Protocol or cipher suite mismatch Fail3
IE 8-10 / Win 7  R Protocol or cipher suite mismatch Fail3
IE 11 / Win 7  R TLS 1.2 TLS_RSA_WITH_AES_128_CBC_SHA256 (0x3c)   No FS 128
IE 11 / Win 8.1  R TLS 1.2 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (0xc028)   FS 256
IE Mobile 10 / Win Phone 8.0 Protocol or cipher suite mismatch Fail3
IE Mobile 11 / Win Phone 8.1 TLS 1.2 TLS_RSA_WITH_AES_128_CBC_SHA256 (0x3c)   No FS 128
Java 6u45   No SNI 2 Protocol or cipher suite mismatch Fail3
Java 7u25 Protocol or cipher suite mismatch Fail3
Java 8b132 TLS 1.2 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 (0xc027)   FS 128
OpenSSL 0.9.8y Protocol or cipher suite mismatch Fail3
OpenSSL 1.0.1h TLS 1.2 TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030)   FS 256
Safari 5.1.9 / OS X 10.6.8 Protocol or cipher suite mismatch Fail3
Safari 6 / iOS 6.0.1  R TLS 1.2 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (0xc028)   FS 256
Safari 7 / iOS 7.1  R TLS 1.2 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (0xc028)   FS 256
Safari 8 / iOS 8.0 Beta  R TLS 1.2 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (0xc028)   FS 256
Safari 6.0.4 / OS X 10.8.4  R Protocol or cipher suite mismatch Fail3
Safari 7 / OS X 10.9  R TLS 1.2 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (0xc028)   FS 256
Yahoo Slurp Jun 2014   No SNI 2 TLS 1.2 TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030)   FS 256
YandexBot Sep 2014 TLS 1.2 TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030)   FS 256
(1) Clients that do not support Forward Secrecy (FS) are excluded when determining support for it.
(2) No support for virtual SSL hosting (SNI). Connects to the default site if the server uses SNI.
(3) Only first connection attempt simulated. Browsers tend to retry with a lower protocol version.
(R) Denotes a reference browser or client, with which we expect better effective security.
(All) We use defaults, but some platforms do not use their best protocols and features (e.g., Java 6 & 7, older IE).

Überarbeitete Konfiguration

Eintrag:

SSLProtocol all -SSLv2 -SSLv3

SSLCipherSuite HIGH:MEDIUM:!aNULL:!MD5

Ergebnis unter Debian:

debianssl

Unterstützte Browsersuiten:

Handshake Simulation
Android 2.3.7   No SNI 2 TLS 1.0 TLS_RSA_WITH_RC4_128_SHA (0x5)   No FS   RC4 128
Android 4.0.4 TLS 1.0 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (0xc014)   FS 256
Android 4.1.1 TLS 1.0 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (0xc014)   FS 256
Android 4.2.2 TLS 1.0 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (0xc014)   FS 256
Android 4.3 TLS 1.0 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (0xc014)   FS 256
Android 4.4.2 TLS 1.2 TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030)   FS 256
BingBot Dec 2013   No SNI 2 TLS 1.0 TLS_RSA_WITH_AES_128_CBC_SHA (0x2f)   No FS 128
BingPreview Jun 2014 TLS 1.0 TLS_DHE_RSA_WITH_AES_256_CBC_SHA (0x39)   FS 256
Chrome 37 / OS X  R TLS 1.2 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (0xc02f)   FS 128
Firefox 24.2.0 ESR / Win 7 TLS 1.0 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (0xc014)   FS 256
Firefox 32 / OS X  R TLS 1.2 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (0xc02f)   FS 128
Googlebot Jun 2014 TLS 1.0 TLS_ECDHE_RSA_WITH_RC4_128_SHA (0xc011)   FS   RC4 128
IE 6 / XP   No FS 1   No SNI 2 Protocol or cipher suite mismatch Fail3
IE 7 / Vista TLS 1.0 TLS_RSA_WITH_AES_128_CBC_SHA (0x2f)   No FS 128
IE 8 / XP   No FS 1   No SNI 2 TLS 1.0 TLS_RSA_WITH_RC4_128_SHA (0x5)   No FS   RC4 128
IE 8-10 / Win 7  R TLS 1.0 TLS_RSA_WITH_AES_128_CBC_SHA (0x2f)   No FS 128
IE 11 / Win 7  R TLS 1.2 TLS_RSA_WITH_AES_128_CBC_SHA256 (0x3c)   No FS 128
IE 11 / Win 8.1  R TLS 1.2 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (0xc028)   FS 256
IE Mobile 10 / Win Phone 8.0 TLS 1.0 TLS_RSA_WITH_AES_128_CBC_SHA (0x2f)   No FS 128
IE Mobile 11 / Win Phone 8.1 TLS 1.2 TLS_RSA_WITH_AES_128_CBC_SHA256 (0x3c)   No FS 128
Java 6u45   No SNI 2 TLS 1.0 TLS_RSA_WITH_RC4_128_SHA (0x5)   No FS   RC4 128
Java 7u25 TLS 1.0 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (0xc013)   FS 128
Java 8b132 TLS 1.2 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 (0xc027)   FS 128
OpenSSL 0.9.8y TLS 1.0 TLS_DHE_RSA_WITH_AES_256_CBC_SHA (0x39)   FS 256
OpenSSL 1.0.1h TLS 1.2 TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030)   FS 256
Safari 5.1.9 / OS X 10.6.8 TLS 1.0 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (0xc013)   FS 128
Safari 6 / iOS 6.0.1  R TLS 1.2 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (0xc028)   FS 256
Safari 7 / iOS 7.1  R TLS 1.2 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (0xc028)   FS 256
Safari 8 / iOS 8.0 Beta  R TLS 1.2 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (0xc028)   FS 256
Safari 6.0.4 / OS X 10.8.4  R TLS 1.0 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (0xc014)   FS 256
Safari 7 / OS X 10.9  R TLS 1.2 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (0xc028)   FS 256
Yahoo Slurp Jun 2014   No SNI 2 TLS 1.2 TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030)   FS 256
YandexBot Sep 2014 TLS 1.2 TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030)   FS 256
(1) Clients that do not support Forward Secrecy (FS) are excluded when determining support for it.
(2) No support for virtual SSL hosting (SNI). Connects to the default site if the server uses SNI.
(3) Only first connection attempt simulated. Browsers tend to retry with a lower protocol version.
(R) Denotes a reference browser or client, with which we expect better effective security.
(All) We use defaults, but some platforms do not use their best protocols and features (e.g., Java 6 & 7, older IE).

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