Is the website only served over https?
Test :
$ curl -s -I http://example.org | grep '^HTTP'
HTTP/1.1 301 Moved Permanently
$ curl -s -I https://example.org | grep '^HTTP'
HTTP/1.1 200 OK
Is the HSTS http-header set?
Test :
$ curl -s -I https://example.org | grep '^Strict'
Strict-Transport-Security: max-age=63072000; includeSubdomains;
Is the server certificate at least 4096 bits?
Test :
$ openssl s_client -showcerts -connect example.org:443 |& grep '^Server public key'
Server public key is 4096 bit
Is TLS1.2 the only supported protocol?
Test :
$ curl --sslv3 https://example.org
curl: (35) Server aborted the SSL handshake
$ curl --tlsv1.0 -I https://example.org
curl: (35) Server aborted the SSL handshake
$ curl --tlsv1.1 -I https://example.org
curl: (35) Server aborted the SSL handshake
$ curl --tlsv1.2 -s -I https://example.org | grep 'HTTP'
HTTP/1.1 200 OK
Do all supported symmetric ciphers use at least 256 bit keys?
Test :
$ nmap --script ssl-enum-ciphers -p 443 example.org
PORT STATE SERVICE
443/tcp open https
| ssl-enum-ciphers:
| TLSv1.2:
| ciphers:
| TLS_DHE_RSA_WITH_AES_256_CBC_SHA - strong
| TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 - strong
| TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 - strong
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA - strong
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 - strong
| TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 - strong
| compressors:
| NULL
|_ least strength: strong
Is the Diffie-Hellman prime at least 4096 bits?
Test :
$ openssl s_client -connect example.com:443 -cipher "EDH" |& grep "^Server Temp Key"
Server Temp Key: DH, 4096 bits
Have you ensured that your content cannot be embedded in a frame on another website?
Test :
$ curl -s -I https://example.org | grep '^X-Frame-Options'
X-Frame-Options: SAMEORIGIN
$ curl -s -I https://example_2.org | grep '^X-Frame-Options'
X-Frame-Options: DENY # Also acceptable
Have you ensured that the Internet Explorer content sniffer is disabled?
Test :
$ curl -s -I https://example.org | grep '^X-Content'
X-Content-Type-Options: nosniff
Have you disabled password-based login over ssh, and only allowed key-based login?
Test :
$ cat /etc/ssh/sshd_config | grep '^Password'
PasswordAuthentication no
Do session cookies have the 'Secure' and 'HttpOnly' flag set?
Test :
- $ curl -s -I example.com/url_that_sets_cookie | grep '^Set-Cookie'
- Set-Cookie: ****;Path=/;Expires=Fri, 16-Mar-2018 19:18:51 GMT;Secure;HttpOnly;Priority=HIGH
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