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da30ae4f IB |
1 | { |
2 | description = "Secrets handling"; | |
3 | ||
4 | outputs = { self }: { | |
5 | nixosModule = { config, lib, pkgs, ... }: { | |
1a64deeb IB |
6 | # Necessary for situations where flake gets included multiple times |
7 | key = builtins.hashString "sha256" (builtins.path { path = self.sourceInfo.outPath; name = "source"; }); | |
da30ae4f IB |
8 | options.secrets = with lib; { |
9 | keys = mkOption { | |
4c4652aa IB |
10 | type = types.attrsOf (types.submodule { |
11 | options = { | |
12 | isTemplated = mkOption { | |
13 | type = types.bool; | |
14 | default = true; | |
15 | description = "If the file is a gucci template that needs to be resolved"; | |
16 | }; | |
17 | isDir = mkOption { | |
18 | type = types.bool; | |
19 | default = false; | |
20 | description = "If the entry is a directory"; | |
21 | }; | |
22 | group = mkOption { | |
23 | type = types.str; | |
24 | default = "root"; | |
25 | description = "Group to associate to the entry"; | |
26 | }; | |
27 | user = mkOption { | |
28 | type = types.str; | |
29 | default = "root"; | |
30 | description = "User to associate to the entry"; | |
31 | }; | |
32 | permissions = mkOption { | |
33 | type = types.str; | |
34 | default = "0600"; | |
35 | description = "Permissions to associate to the entry"; | |
36 | }; | |
37 | text = mkOption { | |
38 | type = types.str; | |
39 | description = "Content of the entry"; | |
40 | }; | |
1a64deeb IB |
41 | keyDependencies = mkOption { |
42 | default = []; | |
43 | type = types.listOf (types.either types.path types.package); | |
44 | description = '' | |
45 | (public) system dependencies that needs to be | |
46 | uploaded with the key. | |
47 | ||
48 | keyDependencies + ignoredKeyDependencies should | |
49 | contain the exhaustive list of the text context. | |
50 | ||
51 | A warning will be thrown if there are remaning | |
52 | dependencies from the text. | |
53 | ''; | |
54 | }; | |
55 | ignoredKeyDependencies = mkOption { | |
56 | default = []; | |
57 | type = types.listOf (types.either types.path types.package); | |
58 | description = '' | |
59 | dependencies that must not be sent along with the key. | |
60 | ||
61 | keyDependencies + ignoredKeyDependencies should | |
62 | contain the exhaustive list of the text context. | |
63 | ||
64 | A warning will be thrown if there are remaning | |
65 | dependencies from the text. | |
66 | ''; | |
67 | }; | |
4c4652aa IB |
68 | }; |
69 | }); | |
70 | default = {}; | |
71 | description = "Keys attrs to upload to the server"; | |
1a64deeb | 72 | apply = builtins.mapAttrs (dest: v: v // { inherit dest; }); |
da30ae4f IB |
73 | }; |
74 | gpgKeys = mkOption { | |
75 | type = types.listOf types.path; | |
76 | default = []; | |
77 | description = "GPG public keys files to encrypt to"; | |
78 | }; | |
79 | ageKeys = mkOption { | |
80 | type = types.listOf types.str; | |
81 | default = []; | |
82 | description = "AGE keys to encrypt to"; | |
83 | }; | |
84 | decryptKey = mkOption { | |
85 | type = types.str; | |
86 | default = "/etc/ssh/ssh_host_ed25519_key"; | |
87 | description = "ed25519 key used to decrypt with AGE"; | |
88 | }; | |
89 | location = mkOption { | |
90 | type = types.path; | |
91 | default = "/var/secrets"; | |
92 | description = "Location where to put the keys"; | |
93 | }; | |
94 | secretsVars = mkOption { | |
95 | type = types.path; | |
96 | description = "Location where the secrets variables are defined, to be used to fill the templates in secrets"; | |
97 | }; | |
98 | deleteSecretsVars = mkOption { | |
99 | type = types.bool; | |
100 | default = false; | |
101 | description = "Delete secrets file after deployment"; | |
102 | }; | |
103 | # Read-only variables | |
104 | fullPaths = mkOption { | |
105 | type = types.attrsOf types.path; | |
1a64deeb IB |
106 | default = builtins.mapAttrs |
107 | (n: v: "${config.secrets.location}/${n}") config.secrets.keys; | |
da30ae4f IB |
108 | readOnly = true; |
109 | description = "set of full paths to secrets"; | |
110 | }; | |
111 | }; | |
112 | ||
113 | config = let | |
114 | location = config.secrets.location; | |
1a64deeb | 115 | keys = builtins.attrValues config.secrets.keys; |
da30ae4f | 116 | empty = pkgs.runCommand "empty" { preferLocalBuild = true; } "mkdir -p $out && touch $out/done"; |
4c4652aa | 117 | fpath = v: "secrets/${v.dest}${lib.optionalString v.isTemplated ".gucci.tpl"}"; |
da30ae4f | 118 | dumpKey = v: |
4c4652aa | 119 | if v.isDir then |
da30ae4f IB |
120 | '' |
121 | mkdir -p secrets/${v.dest} | |
122 | cat >> mods <<EOF | |
4c4652aa | 123 | ${v.user} ${v.group} ${v.permissions} secrets/${v.dest} |
da30ae4f IB |
124 | EOF |
125 | '' | |
126 | else '' | |
127 | mkdir -p secrets/$(dirname ${v.dest}) | |
128 | echo -n ${lib.strings.escapeShellArg v.text} > ${fpath v} | |
129 | cat >> mods <<EOF | |
4c4652aa | 130 | ${v.user} ${v.group} ${v.permissions} ${fpath v} |
da30ae4f IB |
131 | EOF |
132 | ''; | |
133 | secrets = pkgs.runCommand "secrets.tar.enc" { | |
134 | buildInputs = [ pkgs.gnupg pkgs.sops ]; | |
135 | } '' | |
136 | touch mods | |
137 | tar --format=ustar --mtime='1970-01-01' -P --transform="s@${empty}@secrets@" -cf $out ${empty}/done | |
138 | ${builtins.concatStringsSep "\n" (map dumpKey keys)} | |
139 | cat mods | while read u g p k; do | |
140 | tar --no-recursion --format=ustar --mtime='1970-01-01' --owner="$u" --group="$g" --mode="$p" --append -f $out "$k" | |
141 | done | |
142 | export HOME=$(pwd) | |
143 | fingerprints= | |
144 | for key in ${builtins.concatStringsSep " " config.secrets.gpgKeys}; do | |
145 | gpg --import $key 2>/dev/null | |
146 | fingerprints=$fingerprints,$(cat $key | gpg --with-colons --import-options show-only --import 2>/dev/null | grep ^fpr | cut -d: -f10 | head -n1) | |
147 | done | |
148 | ||
149 | sops --age ${builtins.concatStringsSep "," config.secrets.ageKeys} --pgp ''${fingerprints#,} --input-type binary -i -e $out 2>/dev/null | |
150 | ''; | |
151 | pathChmodExcl = | |
152 | let | |
4c4652aa | 153 | dirs = builtins.filter (v: v.isDir) keys; |
da30ae4f IB |
154 | exclPath = builtins.concatStringsSep " -o " (map (d: " -path $TMP/${d.dest}") dirs); |
155 | in | |
156 | lib.optionalString (builtins.length dirs > 0) " -not \\( ${exclPath} \\) "; | |
1a64deeb IB |
157 | |
158 | checkKeyDependencies = key: | |
159 | let | |
160 | allDeps = builtins.map (n: if builtins.isPath n then "${n}" else n.drvPath) (key.keyDependencies ++ key.ignoredKeyDependencies); | |
161 | context = builtins.attrNames (builtins.getContext key.text); | |
162 | missing = builtins.foldl' (o: n: lib.remove n o) context allDeps; | |
163 | in | |
164 | lib.optional (!key.isDir && builtins.length missing > 0) | |
165 | '' | |
166 | Key ${key.dest} has non declared dependencies in its context: ${builtins.concatStringsSep " " missing} | |
167 | Add them to ignoredKeyDependencies to ignore | |
168 | ''; | |
da30ae4f | 169 | in lib.mkIf (builtins.length keys > 0) { |
1a64deeb IB |
170 | warnings = lib.concatMap checkKeyDependencies keys; |
171 | # FIXME: Use lib.concatMap (k: k.keyDependencies) keys in latest nixpkgs | |
172 | system.extraDependencies = lib.concatMap (k: builtins.map (dep: | |
173 | if builtins.isPath dep then pkgs.writeText "extra-dep" "${dep}" else dep | |
174 | ) k.keyDependencies) keys; | |
da30ae4f IB |
175 | system.activationScripts.secrets = { |
176 | deps = [ "users" "wrappers" ]; | |
177 | text = '' | |
178 | install -m0750 -o root -g keys -d ${location} | |
179 | TMP=$(${pkgs.coreutils}/bin/mktemp -d) | |
180 | TMPWORK=$(${pkgs.coreutils}/bin/mktemp -d) | |
181 | chmod go-rwx $TMPWORK | |
1a64deeb | 182 | if [ -n "$TMP" -a -n "$TMPWORK" -a -f ${config.secrets.secretsVars} ]; then |
da30ae4f IB |
183 | install -m0750 -o root -g keys -d $TMP |
184 | ${pkgs.ssh-to-age}/bin/ssh-to-age -private-key -i ${config.secrets.decryptKey} -o $TMPWORK/keys.txt | |
185 | SOPS_AGE_KEY_FILE=$TMPWORK/keys.txt ${pkgs.sops}/bin/sops -d ${secrets} | ${pkgs.gnutar}/bin/tar --strip-components 1 -C $TMP -x | |
1a64deeb | 186 | SOPS_AGE_KEY_FILE=$TMPWORK/keys.txt ${pkgs.sops}/bin/sops -d ${config.secrets.secretsVars} > $TMPWORK/vars.yml |
da30ae4f IB |
187 | if [ -f $TMPWORK/vars.yml ]; then |
188 | find $TMP -name "*.gucci.tpl" -exec \ | |
189 | /bin/sh -c 'f="{}"; ${pkgs.gucci}/bin/gucci -f '$TMPWORK'/vars.yml "$f" > "''${f%.gucci.tpl}"; touch --reference "$f" ''${f%.gucci.tpl} ; chmod --reference="$f" ''${f%.gucci.tpl} ; chown --reference="$f" ''${f%.gucci.tpl}' \; | |
190 | fi | |
191 | find $TMP -type d ${pathChmodExcl}-exec chown root:keys {} \; -exec chmod o-rx {} \; | |
192 | ${pkgs.rsync}/bin/rsync --exclude="*.gucci.tpl" -O -c -av --delete $TMP/ ${location} | |
193 | rm -rf $TMP $TMPWORK ${lib.optionalString config.secrets.deleteSecretsVars config.secrets.secretsVars} | |
194 | fi | |
195 | ''; | |
196 | }; | |
197 | ||
198 | }; | |
199 | }; | |
200 | }; | |
201 | } |