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Harden SSH config

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This commit is contained in:
Artemis Tosini 2022-08-30 16:15:54 +00:00
parent ace2aad598
commit cd47e773dd
Signed by: artemist
GPG key ID: EE5227935FE3FF18
2 changed files with 14 additions and 2 deletions
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5
home/ssh/default.nix
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@ -11,9 +11,10 @@
# We have to do this as text to gaurantee it's part of the last Host * block
userKnownHostsFile = "~/.ssh/known_hosts ${./extra_known_hosts}";
extraConfig = ''
KexAlgorithms sntrup761x25519-sha512@openssh.com,curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group-exchange-sha256
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-512,hmac-sha2-256,umac-128@openssh.com
KexAlgorithms sntrup761x25519-sha512@openssh.com,curve25519-sha256,curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,umac-128-etm@openssh.com
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
HostKeyAlgorithms ssh-ed25519,ssh-ed25519-cert-v01@openssh.com,sk-ssh-ed25519@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,rsa-sha2-256,rsa-sha2-256-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-512-cert-v01@openssh.com
VerifyHostKeyDNS ask
VisualHostKey yes
UpdateHostKeys ask

11
sets/sshd.nix
View file

@ -6,6 +6,17 @@
permitRootLogin = "no";
passwordAuthentication = false;
kbdInteractiveAuthentication = false;
kexAlgorithms = [
"sntrup761x25519-sha512@openssh.com"
"curve25519-sha256"
"curve25519-sha256@libssh.org"
];
macs = [
"hmac-sha2-512-etm@openssh.com"
"hmac-sha2-256-etm@openssh.com"
"umac-128-etm@openssh.com"
];
};
# users.users.artemis.openssh.authorizedKeys.keys set in private
}