Das Testen der TLS-Versionen auf einem Server ist mit nmap sehr einfach. Dazu muss unter Ubuntu das Paket nmap installiert sein. Die Installation erfolgt mit
:~$ sudo apt-get update && sudo ap-get install nmap
Die unterstützten Ciphers erhält man mit
:~$ nmap --script ssl-enum-ciphers -p
Das Resultat sieht dann z.B. so aus:
Starting Nmap 7.01 ( https://nmap.org ) at 2018-03-05 11:39 CET
Nmap scan report for 192.168.0.56
Host is up (0.021s latency).
PORT STATE SERVICE
143/tcp open imap
| ssl-enum-ciphers:
| TLSv1.2:
| ciphers:
| TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (dh 1024) - A
| TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 (dh 1024) - A
| TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (secp256r1) - A
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (secp256r1) - A
| TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 (dh 1024) - A
| TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 (dh 1024) - A
| TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (secp256r1) - A
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 (secp256r1) - A
| TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA (dh 1024) - A
| TLS_DHE_RSA_WITH_AES_256_CBC_SHA (dh 1024) - A
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
| TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA (dh 1024) - A
| TLS_DHE_RSA_WITH_AES_128_CBC_SHA (dh 1024) - A
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A
| TLS_RSA_WITH_CAMELLIA_128_CBC_SHA (rsa 2048) - A
| TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
| compressors:
| NULL
| cipher preference: server
| warnings:
| Key exchange parameters of lower strength than certificate key
|_ least strength: A
Nmap done: 1 IP address (1 host up) scanned in 7.81 seconds
Nmap scan report for 192.168.0.56
Host is up (0.021s latency).
PORT STATE SERVICE
143/tcp open imap
| ssl-enum-ciphers:
| TLSv1.2:
| ciphers:
| TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (dh 1024) - A
| TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 (dh 1024) - A
| TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (secp256r1) - A
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (secp256r1) - A
| TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 (dh 1024) - A
| TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 (dh 1024) - A
| TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (secp256r1) - A
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 (secp256r1) - A
| TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA (dh 1024) - A
| TLS_DHE_RSA_WITH_AES_256_CBC_SHA (dh 1024) - A
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
| TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA (dh 1024) - A
| TLS_DHE_RSA_WITH_AES_128_CBC_SHA (dh 1024) - A
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A
| TLS_RSA_WITH_CAMELLIA_128_CBC_SHA (rsa 2048) - A
| TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
| compressors:
| NULL
| cipher preference: server
| warnings:
| Key exchange parameters of lower strength than certificate key
|_ least strength: A
Nmap done: 1 IP address (1 host up) scanned in 7.81 seconds
