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1 | { lib, pkgs, config, ... }: | |
2 | { | |
3 | options.secrets = { | |
4 | keys = lib.mkOption { | |
5 | type = lib.types.listOf lib.types.unspecified; | |
6 | default = []; | |
7 | description = "Keys to upload to server"; | |
8 | }; | |
9 | location = lib.mkOption { | |
10 | type = lib.types.path; | |
11 | default = "/var/secrets"; | |
12 | description = "Location where to put the keys"; | |
13 | }; | |
14 | }; | |
15 | config = let | |
16 | location = config.secrets.location; | |
17 | keys = config.secrets.keys; | |
18 | empty = pkgs.runCommand "empty" { preferLocalBuild = true; } "mkdir -p $out && touch $out/done"; | |
19 | dumpKey = v: '' | |
20 | mkdir -p secrets/$(dirname ${v.dest}) | |
21 | echo -n ${lib.strings.escapeShellArg v.text} > secrets/${v.dest} | |
22 | cat >> mods <<EOF | |
23 | ${v.user or "root"} ${v.group or "root"} ${v.permissions or "0600"} secrets/${v.dest} | |
24 | EOF | |
25 | ''; | |
26 | secrets = pkgs.runCommand "secrets.tar" {} '' | |
27 | touch mods | |
28 | tar --format=ustar --mtime='1970-01-01' -P --transform="s@${empty}@secrets@" -cf $out ${empty}/done | |
29 | ${builtins.concatStringsSep "\n" (map dumpKey keys)} | |
30 | cat mods | while read u g p k; do | |
31 | tar --format=ustar --mtime='1970-01-01' --owner="$u" --group="$g" --mode="$p" --append -f $out "$k" | |
32 | done | |
33 | ''; | |
34 | in lib.mkIf (builtins.length keys > 0) { | |
35 | system.activationScripts.secrets = { | |
36 | deps = [ "users" "wrappers" ]; | |
37 | text = '' | |
38 | install -m0750 -o root -g keys -d ${location} | |
39 | if [ -f /run/keys/secrets.tar ]; then | |
40 | if [ ! -f ${location}/currentSecrets ] || ! sha512sum -c --status "${location}/currentSecrets"; then | |
41 | echo "rebuilding secrets" | |
42 | rm -rf ${location} | |
43 | install -m0750 -o root -g keys -d ${location} | |
44 | ${pkgs.gnutar}/bin/tar --strip-components 1 -C ${location} -xf /run/keys/secrets.tar | |
45 | sha512sum /run/keys/secrets.tar > ${location}/currentSecrets | |
46 | find ${location} -type d -exec chown root:keys {} \; -exec chmod o-rx {} \; | |
47 | fi | |
48 | fi | |
49 | ''; | |
50 | }; | |
51 | deployment.keys."secrets.tar" = { | |
52 | permissions = "0400"; | |
53 | # keyFile below is not evaluated at build time by nixops, so the | |
54 | # `secrets` path doesn’t necessarily exist when uploading the | |
55 | # keys, and nixops is unhappy. | |
56 | user = "root${builtins.substring 10000 1 secrets}"; | |
57 | group = "root"; | |
58 | keyFile = "${secrets}"; | |
59 | }; | |
60 | }; | |
61 | } |