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roles/common: Remove 128-bit Ciphers and MACs from sshd_config 

I had removed them from Debian 8 and Ubuntu 14.04 configs last year
when the NSA's Suite B crypto guidelines dropped 128-bit algorithms
but those changes didn't make it to my new Ubuntu 16.04 config.

It is probably overkill and paranoid, but this server is mine, so I
can make those decisions (and I only connect from modern clients).
This commit is contained in:
Alan Orth 2016-08-16 14:28:58 +03:00
parent 33cdcc9ad1
commit b7c92e4dc1
Signed by: alanorth
GPG Key ID: 0FB860CC9C45B1B9
1 changed files with 5 additions and 3 deletions
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8
roles/common/templates/sshd_config_Ubuntu-16.04.j2
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@ -85,9 +85,11 @@ Subsystem sftp /usr/lib/openssh/sftp-server
# and ChallengeResponseAuthentication to 'no'.
UsePAM yes
# https://stribika.github.io/2015/01/04/secure-secure-shell.html
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes128-ctr
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-ripemd160-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-512,hmac-sha2-256
# Originally from: https://stribika.github.io/2015/01/04/secure-secure-shell.html
# ... but with ciphers and MACs with < 256 bits removed, as NSA's Suite B now
# does away with these! See: https://www.nsa.gov/ia/programs/suiteb_cryptography/index.shtml
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes256-ctr
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512,hmac-sha2-256
KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256
{% if ssh_allowed_users is defined and ssh_allowed_users %}