TLS Constraints

Modified on Tue, 18 Oct, 2022 at 4:49 PM

Cipher Suite

Gremlin does not support cipher suites considered to be weak. This includes:

  • SSL1, SSL2, SSL3, TLS1 or TLS1.1.

  • RC4.

  • DES or triple DES.

  • EXPORT ciphersuites.

  • MAC-then-encrypt ciphersuites.

  • Ciphersuites without forward secrecy.

  • Renegotiation.

  • Kerberos.

  • Compression.

  • Discrete-log Diffie-Hellman.

  • Automatic protocol version downgrade.

For more information on these considerations, see A review of protocol vulnerabilities.

Self-Signed Certificates

The following are constraints on valid certificates accepted by Gremlin:

  • Per RFC6125 recommendation, a Certificate must have a defined Subject Alternative Name (Gremlin ignores the `CN` field)

  • For end-entity certificates (the server’s certificate), they must not also be a Certificate Authority (CA)

The following is an example on how to create a certificate that works with Gremlin, though there are other ways to produce valid certificates.

openssl req \
  -x509 \
  -newkey rsa:4096 \
  -keyout key.pem \
  -out cert.pem \
  -sha256 \
  -days 365 \
  -nodes \
  -addext 'subjectAltName = DNS:host.docker.internal' \
  -addext 'basicConstraints=critical,CA:FALSE'


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