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roles/common: Tune sshd_config to be more strict 

Disable ECDSA as a signature algorithm and drop some older message
authentication algorithms.

See: https://stribika.github.io/2015/01/04/secure-secure-shell.html

Signed-off-by: Alan Orth <alan.orth@gmail.com>
This commit is contained in:
Alan Orth 2015-01-07 01:45:35 +03:00
parent a80cb49957
commit 13b592dfcd
1 changed files with 3 additions and 4 deletions
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7
roles/common/templates/sshd_config_Ubuntu-14.04.j2
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@ -9,7 +9,6 @@ Port 22
Protocol 2
# HostKeys for protocol version 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
HostKey /etc/ssh/ssh_host_ed25519_key
#Privilege Separation is turned on for security
UsePrivilegeSeparation yes
@ -86,10 +85,10 @@ Subsystem sftp /usr/lib/openssh/sftp-server
# and ChallengeResponseAuthentication to 'no'.
UsePAM yes
# bettercrypto.org - June, 2014
# 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,umac-128-etm@openssh.com,hmac-sha2-512,hmac-sha2-256,hmac-ripemd160
KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-ripemd160-etm@openssh.com,umac-128-etm@openssh.com
KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256
{% if ssh_allowed_users is defined and ssh_allowed_users %}
# Is there a list of allowed users?