You should use these commands set to check supported SSL and TLS ciphers. Also, I added some useful information about send HTTPS requests to a server.
- Check supported SSL and TLS version with "nmap" command.
# nmap --script ssl-enum-ciphers -p 443 www.google.com Starting Nmap 6.40 ( http://nmap.org ) at 2017-08-10 11:15 +03 Nmap scan report for www.google.com (216.58.208.100) Host is up (0.012s latency). rDNS record for 216.58.208.100: sof01s11-in-f100.1e100.net PORT STATE SERVICE 443/tcp open https | ssl-enum-ciphers: | TLSv1.0: | ciphers: | TLS_RSA_WITH_3DES_EDE_CBC_SHA - strong | TLS_RSA_WITH_AES_128_CBC_SHA - strong | TLS_RSA_WITH_AES_256_CBC_SHA - strong | compressors: | NULL | TLSv1.1: | ciphers: | TLS_RSA_WITH_3DES_EDE_CBC_SHA - strong | TLS_RSA_WITH_AES_128_CBC_SHA - strong | TLS_RSA_WITH_AES_256_CBC_SHA - strong | compressors: | NULL | TLSv1.2: | ciphers: | TLS_RSA_WITH_3DES_EDE_CBC_SHA - strong | TLS_RSA_WITH_AES_128_CBC_SHA - strong | TLS_RSA_WITH_AES_128_GCM_SHA256 - strong | TLS_RSA_WITH_AES_256_CBC_SHA - strong | TLS_RSA_WITH_AES_256_GCM_SHA384 - strong | compressors: | NULL |_ least strength: strong Nmap done: 1 IP address (1 host up) scanned in 7.03 seconds
- Check if system accept SSL3 request with "openssl" command. As you see command failed for SSL3 when we check google page. Also you can test it with TLS1 . It will accept TLS1 connection.
# openssl s_client -connect www.google.com:443 -ssl3 CONNECTED(00000003) 139946845312928:error:1408F10B:SSL routines:SSL3_GET_RECORD:wrong version number:s3_pkt.c:339: --- no peer certificate available --- No client certificate CA names sent --- SSL handshake has read 5 bytes and written 7 bytes --- New, (NONE), Cipher is (NONE) Secure Renegotiation IS NOT supported Compression: NONE Expansion: NONE SSL-Session: Protocol : SSLv3 Cipher : 0000 Session-ID: Session-ID-ctx: Master-Key: Key-Arg : None Krb5 Principal: None PSK identity: None PSK identity hint: None Start Time: 1502352980 Timeout : 7200 (sec) Verify return code: 0 (ok)
#openssl s_client -connect www.google.com:443 -tls1 #openssl s_client -connect www.google.com:443 -tls1_1 #openssl s_client -connect www.google.com:443 -tls1_2 #openssl s_client -connect www.google.com:443 -dtls1
- Check certificate information . Also you can write script to monitor certificate expire date. I added some command to check information about certificate.
Get CN information
#echo | openssl s_client -connect $iP:$PORT_NUMBER 2>/dev/null | openssl x509 -noout -subject|awk -F "/" '{print $NF}'
Get Issuer information
#echo | openssl s_client -connect $iP:$PORT_NUMBER 2>/dev/null | openssl x509 -noout -issuer
Get Expire date
#echo | openssl s_client -connect $i:$PORT_NUMBER 2>/dev/null | openssl x509 -noout -enddate|cut -d '=' -f 2,2
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