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nixos/sshd: add options for kexAlgorithms, ciphers and MACs

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Silvan Mosberger 2018-04-20 13:27:10 +02:00
parent a9cd8ef23e
commit ee3fd4ad53
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1 changed files with 62 additions and 8 deletions
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70
nixos/modules/services/networking/ssh/sshd.nix
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@ -213,6 +213,65 @@ in
description = "Files from which authorized keys are read.";
};
kexAlgorithms = mkOption {
type = types.listOf types.str;
default = [
"curve25519-sha256@libssh.org"
"diffie-hellman-group-exchange-sha256"
];
description = ''
Allowed key exchange algorithms
</para>
<para>
Defaults to recommended settings from both
<link xlink:href="https://stribika.github.io/2015/01/04/secure-secure-shell.html" />
and
<link xlink:href="https://wiki.mozilla.org/Security/Guidelines/OpenSSH#Modern_.28OpenSSH_6.7.2B.29" />
'';
};
ciphers = mkOption {
type = types.listOf types.str;
default = [
"chacha20-poly1305@openssh.com"
"aes256-gcm@openssh.com"
"aes128-gcm@openssh.com"
"aes256-ctr"
"aes192-ctr"
"aes128-ctr"
];
description = ''
Allowed ciphers
</para>
<para>
Defaults to recommended settings from both
<link xlink:href="https://stribika.github.io/2015/01/04/secure-secure-shell.html" />
and
<link xlink:href="https://wiki.mozilla.org/Security/Guidelines/OpenSSH#Modern_.28OpenSSH_6.7.2B.29" />
'';
};
macs = mkOption {
type = types.listOf types.str;
default = [
"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"
];
description = ''
Allowed MACs
</para>
<para>
Defaults to recommended settings from both
<link xlink:href="https://stribika.github.io/2015/01/04/secure-secure-shell.html" />
and
<link xlink:href="https://wiki.mozilla.org/Security/Guidelines/OpenSSH#Modern_.28OpenSSH_6.7.2B.29" />
'';
};
extraConfig = mkOption {
type = types.lines;
default = "";
@ -363,14 +422,9 @@ in
HostKey ${k.path}
'')}
### Recommended settings from both:
# https://stribika.github.io/2015/01/04/secure-secure-shell.html
# and
# https://wiki.mozilla.org/Security/Guidelines/OpenSSH#Modern_.28OpenSSH_6.7.2B.29
KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-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,umac-128@openssh.com
KexAlgorithms ${concatStringsSep "," cfg.kexAlgorithms}
Ciphers ${concatStringsSep "," cfg.ciphers}
MACs ${concatStringsSep "," cfg.macs}
# LogLevel VERBOSE logs user's key fingerprint on login.
# Needed to have a clear audit track of which key was used to log in.