niksos/modules/services/ssh.nix

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{
config,
lib,
pkgs,
...
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}: let
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cfg = config.myOptions.services.ssh;
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inherit (lib) mkEnableOption mkIf mkMerge mkOption;
inherit (lib.types) attrsOf bool nullOr number str submodule;
inherit (lib.strings) concatStrings;
inherit (lib.attrsets) mapAttrsToList;
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in {
options.myOptions.services.ssh = {
daemon = mkOption {
description = "sshd options";
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type = submodule {
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options = {
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enable = mkEnableOption "sshd";
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passwordAuth = mkOption {
description = "allow password auth";
default = false;
type = bool;
};
allowRoot = mkOption {
description = "allow root login";
default = false;
type = bool;
};
};
};
};
agent = mkOption {
description = "ssh agent options";
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type = submodule {
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options = {
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enable = mkEnableOption "ssh-agent";
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hostAliases = mkOption {
description = "host aliases";
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type = attrsOf (submodule {
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options = {
hostName = mkOption {
description = "hostname to ssh into";
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type = str;
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};
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port = mkOption {
description = "port to ssh into";
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type = nullOr number;
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default = null;
};
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user = mkOption {
description = "ssh user";
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type = str;
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default = "git";
};
publicKey = mkOption {
description = "public key used for picking the correct key from the ssh-agent";
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type = nullOr str;
ssh-agent (this shit is crazy read the whole commit message) so first when I wanted to configure ssh to use the correct keys by default I found some guide that used IdentitiesOnly yes so I used it too without even knowing what it does then later when I wanted to nix my ssh config I noticed that it's set to true and didn't know what it does so I read the manpage I wrote the description of the `indentitiesOnly` option of my wrapper module based on that but I didn't really understand what it actually does well, as you can see in the commit history, a day or two ago (forgot) I started using an ssh key to sign my commits and to make things even more convenient I moved all of my private ssh keys to my keepassxc database as attachments I tested it on my main laptop and everything worked fine but on that laptop all the keys were still in ~/.ssh as I didn't just want to immediately delete them and risk losing any well that's what hid this bug - on the main laptop when pushing, it just used the keys in ~/.ssh, which I don't have on this laptop (the one I take to classes) because, well, I did this not to have to copy both the keepassxc database and ~/.ssh between machines - I only copied the keepassxc database as it had all the keys in it well turns out with the config before this commit, it would only try to use keys in ~/.ssh which aren't - and won't - be here so it failed this option makes it actually use keys supplied by ssh-agent, which keepassxc acts as and is the only way to get them in the current setup
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default = null;
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};
};
});
default = {};
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};
};
};
};
};
config = mkMerge [
(mkIf cfg.daemon.enable {
services.openssh = {
enable = true;
settings = {
PasswordAuthentication = false;
PermitRootLogin = "no";
};
};
})
(mkIf cfg.agent.enable {
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programs.ssh = {
enableAskPassword = true;
askPassword = "${pkgs.libsForQt5.ksshaskpass}/bin/ksshaskpass";
extraConfig = ''
AddKeysToAgent yes
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${concatStrings (mapAttrsToList (name: value: ''
Host ${name}
HostName ${value.hostName}
User ${value.user}
${
if value.port != null then
"Port ${toString value.port}"
else ""
}
${
if value.publicKey != null then
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"IdentityFile ${pkgs.writeText "${name}.pub" value.publicKey}"
else ""
}
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'') cfg.agent.hostAliases)}
'';
};
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systemd.user.services.ssh-agent = {
enable = true;
description = "SSH key agent";
serviceConfig = {
Type = "simple";
ExecStart = "${pkgs.openssh}/bin/ssh-agent -D -a $SSH_AUTH_SOCK";
};
environment = {
SSH_AUTH_SOCK = "%t/ssh-agent.socket";
DISPLAY = ":0";
};
wantedBy = [ "default.target" ];
};
environment.sessionVariables = {
SSH_AUTH_SOCK = "\$XDG_RUNTIME_DIR/ssh-agent.socket";
};
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})
];
}