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roles/common: Port sshd_config changes from Debian 10 to Ubuntu 20.04 

By now the recommendations we were using as guidance are five years
old. The ciphers have not changed much since then.
This commit is contained in:
Alan Orth 2020-04-25 15:48:43 +03:00
parent 5a58d93dfe
commit 6fcb1290fe
1 changed files with 19 additions and 8 deletions
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27
roles/common/templates/sshd_config_Ubuntu-20.04.j2
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@ -18,28 +18,29 @@ Include /etc/ssh/sshd_config.d/*.conf
#ListenAddress ::
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_ecdsa_key
#HostKey /etc/ssh/ssh_host_ed25519_key
HostKey /etc/ssh/ssh_host_ed25519_key
# Ciphers and keying
#RekeyLimit default none
# Logging
#SyslogFacility AUTH
#LogLevel INFO
# LogLevel VERBOSE logs user's key fingerprint on login. Needed to have a clear audit track of which key was using to log in.
LogLevel VERBOSE
# Authentication:
#LoginGraceTime 2m
#PermitRootLogin prohibit-password
PermitRootLogin prohibit-password
#StrictModes yes
#MaxAuthTries 6
MaxAuthTries 4
#MaxSessions 10
#PubkeyAuthentication yes
# Expect .ssh/authorized_keys2 to be disregarded by default in future.
#AuthorizedKeysFile .ssh/authorized_keys .ssh/authorized_keys2
# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
# but this is overridden so installations will only check .ssh/authorized_keys
AuthorizedKeysFile .ssh/authorized_keys
#AuthorizedPrincipalsFile none
@ -88,7 +89,7 @@ UsePAM yes
#AllowAgentForwarding yes
#AllowTcpForwarding yes
#GatewayPorts no
X11Forwarding yes
X11Forwarding no
#X11DisplayOffset 10
#X11UseLocalhost yes
#PermitTTY yes
@ -122,3 +123,13 @@ Subsystem sftp /usr/lib/openssh/sftp-server
# PermitTTY no
# ForceCommand cvs server
PasswordAuthentication yes
# 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
# only allow shell access by provisioning user
AllowUsers {{ provisioning_user.name }}