mirror of
https://github.com/oqyude/nixos.git
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79 lines
2.6 KiB
Nix
79 lines
2.6 KiB
Nix
{
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config,
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lib,
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pkgs,
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...
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}:
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let
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sshdDir = "${config.user.home}/sshd";
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sshdTmpDir = "${config.user.home}/sshd-tmp";
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port = 8022;
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serviceDir = "${config.user.home}/service";
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# runit run-scripts (executable store paths, linked into ~/service).
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sshdRun = pkgs.writeScriptBin "sshd-run" ''
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#!${pkgs.runtimeShell}
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exec ${pkgs.openssh}/bin/sshd -f /etc/ssh/sshd_config -D
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'';
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svLogRun = pkgs.writeScriptBin "sv-log-run" ''
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#!${pkgs.runtimeShell}
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mkdir -p ./main
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exec ${pkgs.runit}/bin/svlogd -tt ./main
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'';
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svStart = pkgs.writeScriptBin "sv-start" ''
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#!${pkgs.runtimeShell}
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exec ${pkgs.runit}/bin/runsvdir ${serviceDir}
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'';
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in
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{
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# Minimal sshd server for LAN access (e.g. `ssh epral` from other hosts).
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# nix-on-droid has no systemd: sshd is started manually via `sshd-start`
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# (or from Termux:Boot / a session). The host key is generated once on the
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# first activation and kept in ~/sshd (NOT /etc — it is rebuilt on every
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# activation).
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environment.etc."ssh/sshd_config".text = ''
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HostKey ${sshdDir}/ssh_host_ed25519_key
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Port ${toString port}
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PasswordAuthentication no
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AllowUsers ${config.user.userName}
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'';
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# Generate the host key on first activation (idempotent).
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build.activation.sshd = ''
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if [[ ! -d "${sshdDir}" ]]; then
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$DRY_RUN_CMD rm -rf "${sshdTmpDir}"
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$DRY_RUN_CMD mkdir -p "${sshdTmpDir}"
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$VERBOSE_ECHO "Generating sshd host key..."
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$DRY_RUN_CMD ${pkgs.openssh}/bin/ssh-keygen -t ed25519 -f "${sshdTmpDir}/ssh_host_ed25519_key" -N ""
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$DRY_RUN_CMD mv "${sshdTmpDir}" "${sshdDir}"
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fi
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'';
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# runit service tree: ~/service/<name>/{run,log/run}. run/ and log/run are
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# symlinks into the nix store (read-only is fine; runsvdir writes only to
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# the <name>/supervise dirs). /etc/service is symlinked for `sv status`.
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# NOTE: tailscaled was removed — nixpkgs' linux build cannot run inside
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# proot (SELinux blocks netlink; needs GOOS=android or root). Re-add only
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# if that gets solved.
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build.activation.services = ''
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$DRY_RUN_CMD rm -rf ${serviceDir}/tailscaled
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$DRY_RUN_CMD mkdir -p ${serviceDir}/sshd/log
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$DRY_RUN_CMD ln -sfn ${sshdRun}/bin/sshd-run ${serviceDir}/sshd/run
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$DRY_RUN_CMD ln -sfn ${svLogRun}/bin/sv-log-run ${serviceDir}/sshd/log/run
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$DRY_RUN_CMD ln -sfn ${serviceDir} /etc/service
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'';
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environment.packages = [
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pkgs.runit
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# one command brings up all supervised services (sshd, ...)
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svStart
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# manual fallback for sshd only
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(pkgs.writeScriptBin "sshd-start" ''
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#!${pkgs.runtimeShell}
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exec ${pkgs.openssh}/bin/sshd -f /etc/ssh/sshd_config -D "$@"
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'')
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];
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}
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