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nixos: add config.services.openssh.moduliFile option so that users can replace the default file from OpenSSH

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The man page for ssh-keygen(1) has a section "MODULI GENERATION" that describes
how to generate your own moduli file. The following script might also be helpful:

 | #! /usr/bin/env bash
 |
 | moduliFiles=()
 |
 | generateModuli()
 | {
 |   ssh-keygen -G "moduli-$1.candidates" -b "$1"
 |   ssh-keygen -T "moduli-$1" -f "moduli-$1.candidates"
 |   rm "moduli-$1.candidates"
 | }
 |
 | for (( i=0 ; i <= 16 ; ++i )); do
 |   let bitSize="2048 + i * 128"
 |   generateModuli "$bitSize" &
 |   moduliFiles+=( "moduli-$bitSize" )
 | done
 | wait
 |
 | echo >moduli "# Time Type Tests Tries Size Generator Modulus"
 | cat >>moduli "${moduliFiles[@]}"
 | rm "${moduliFiles[@]}"

Note that generating moduli takes a long time, i.e. several hours on a fast
machine!

This patch resolves https://github.com/NixOS/nixpkgs/pull/5870.
This commit is contained in:
Peter Simons 2015-05-22 14:23:21 +02:00
parent 0c35edb25c
commit 86d299bc6e
1 changed files with 13 additions and 1 deletions
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14
nixos/modules/services/networking/ssh/sshd.nix
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@ -268,6 +268,16 @@ in
};
};
moduliFile = mkOption {
example = "services.openssh.moduliFile = /etc/my-local-ssh-moduli;";
type = types.path;
description = ''
Path to <literal>moduli</literal> file to install in
<literal>/etc/ssh/moduli</literal>. If this option is unset, then
the <literal>moduli</literal> file shipped with OpenSSH will be used.
'';
};
};
users.extraUsers = mkOption {
@ -286,8 +296,10 @@ in
description = "SSH privilege separation user";
};
services.openssh.moduliFile = mkDefault "${cfgc.package}/etc/ssh/moduli";
environment.etc = authKeysFiles ++ [
{ source = "${cfgc.package}/etc/ssh/moduli";
{ source = cfg.moduliFile;
target = "ssh/moduli";
}
{ text = knownHostsText;