47 lines
1.5 KiB
Nix
47 lines
1.5 KiB
Nix
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{
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config,
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factsGenerator,
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lib,
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...
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}:
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let
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hostname = "chungus";
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in
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{
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# Defines the root SSH key to be used exclusively for accessing a secure machine.
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# The need for this arises because deployments using the 'clan' command-line tool (e.g. 'clan machines update')
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# make use of the 'ssh -A' option, which forwards the SSH agent from the client to the target machine.
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# If the target machine becomes compromised by an attacker,
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# they could potentially leverage the forwarded SSH agent to access the secure machine.
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# This file prevents that scenario by restricting access strictly to the defined SSH key,
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# which is only used to access the secure machine, so no other ssh-agent will contain this ssh key
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clan.core.facts.services."ssh.root.${hostname}" = factsGenerator.ssh {
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name = "root.${hostname}";
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};
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systemd.tmpfiles.settings.mainUser = {
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"/run/facts/ssh.root.${hostname}.id_ed25519"."C+" = {
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user = config.users.users.mainUser.name;
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group = config.users.users.mainUser.group;
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mode = "400";
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argument =
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config.clan.core.facts.services."ssh.root.${hostname}".secret."ssh.root.${hostname}.id_ed25519".path;
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};
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};
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home-manager.users.mainUser.programs.ssh.matchBlocks =
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lib.genAttrs
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[
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"${hostname}.bear"
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"${hostname}.private"
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"${hostname}.wg0"
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]
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(name: {
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identityFile = "/run/facts/ssh.root.${hostname}.id_ed25519";
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identitiesOnly = true;
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});
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}
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