# A reasonable default for today's standards. # It should provide 112-bit security. # SHA1 is allowed in HMAC where collision resistance does not matter. # MACs: all HMAC with SHA1 or better + all modern MACs (Poly1305 etc) # Curves: all prime >= 255 bits (including Bernstein curves) # Signature algorithms: with SHA-224 hash or better (no DSA) # Ciphers: >= 128-bit key, >= 128-bit block (AES, ChaCha20) # key exchange: ECDHE, RSA, DHE (no DHE-DSS) # DH params size: >= 2048 # RSA params size: >= 2048 # TLS protocols: TLS >= 1.2, DTLS >= 1.2 mac = AEAD HMAC-SHA2-256 HMAC-SHA1 UMAC-128 HMAC-SHA2-384 HMAC-SHA2-512 mac@Kerberos = HMAC-SHA2-384 HMAC-SHA2-256 AEAD UMAC-128 HMAC-SHA2-512 HMAC-SHA1 group = X25519 SECP256R1 X448 SECP521R1 SECP384R1 \ FFDHE-2048 FFDHE-3072 FFDHE-4096 FFDHE-6144 FFDHE-8192 hash = SHA2-256 SHA2-384 SHA2-512 SHA3-256 SHA3-384 SHA3-512 SHA2-224 SHA3-224 \ SHAKE-256 sign = ECDSA-SHA3-256 ECDSA-SHA2-256 ECDSA-SHA2-256-FIDO \ ECDSA-SHA3-384 ECDSA-SHA2-384 \ ECDSA-SHA3-512 ECDSA-SHA2-512 \ EDDSA-ED25519 EDDSA-ED25519-FIDO EDDSA-ED448 \ RSA-PSS-SHA3-256 RSA-PSS-SHA2-256 \ RSA-PSS-SHA3-384 RSA-PSS-SHA2-384 \ RSA-PSS-SHA3-512 RSA-PSS-SHA2-512 \ RSA-PSS-RSAE-SHA3-256 RSA-PSS-RSAE-SHA2-256 \ RSA-PSS-RSAE-SHA3-384 RSA-PSS-RSAE-SHA2-384 \ RSA-PSS-RSAE-SHA3-512 RSA-PSS-RSAE-SHA2-512 \ RSA-SHA3-256 RSA-SHA2-256 \ RSA-SHA3-384 RSA-SHA2-384 \ RSA-SHA3-512 RSA-SHA2-512 \ ECDSA-SHA2-224 RSA-PSS-SHA2-224 RSA-SHA2-224 \ ECDSA-SHA3-224 RSA-PSS-SHA3-224 RSA-SHA3-224 cipher = AES-256-GCM AES-256-CCM CHACHA20-POLY1305 \ AES-256-CTR AES-256-CBC \ AES-128-GCM AES-128-CCM \ AES-128-CTR AES-128-CBC cipher@TLS = AES-256-GCM AES-256-CCM CHACHA20-POLY1305 AES-256-CBC \ AES-128-GCM AES-128-CCM AES-128-CBC # CBC ciphers in SSH are considered vulnerable to plaintext recovery attacks # and disabled in client OpenSSH 7.6 (2017) and server OpenSSH 6.7 (2014). cipher@SSH = -*-CBC # 'RSA' is intentionally before DHE ciphersuites, as the DHE ciphersuites have # interoperability issues in TLS. key_exchange = ECDHE RSA DHE DHE-RSA PSK DHE-PSK ECDHE-PSK RSA-PSK ECDHE-GSS DHE-GSS protocol@TLS = TLS1.3 TLS1.2 DTLS1.2 protocol@IKE = IKEv2 # Parameter sizes min_dh_size = 2048 min_dsa_size = 2048 # DSA is disabled min_rsa_size = 2048 # GnuTLS only for now sha1_in_certs = 0 arbitrary_dh_groups = 1 ssh_certs = 1 etm@SSH = ANY