224 lines
10 KiB
Nix
224 lines
10 KiB
Nix
{ pkgs, lib, config, ... }:
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let
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passwordStoreDir = "/etc/passwords";
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passwordHash = password: builtins.hashString "sha256" "${password.path}\n${builtins.toString password.selector}\n${builtins.toString password.transform}";
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passwordStorePath = password: "${passwordStoreDir}/${passwordHash password}";
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describePassword = password: password.path
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+ (if password.selector != null then " -> ${password.selector}" else "")
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+ (if password.transform != null then " | (${password.transform})" else "");
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passwordFiles = builtins.attrValues config.vivarium.passwordFiles;
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in
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{
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config = {
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system = {
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activationScripts.secrets = {
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deps = [ "users" "groups" ];
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supportsDryActivation = false; # TODO
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text =
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let
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readPassword = password: "cat ${lib.strings.escapeShellArg (passwordStorePath password)}";
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# Using awk's ENVIRON so it should resist any input?
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pipeSubstitute = k: v: ''K=${lib.strings.escapeShellArg k} V="$(${v})" awk '{ gsub (ENVIRON["K"], ENVIRON["V"]); print }' '';
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subsitutePassword = variable: password: pipeSubstitute variable (readPassword password);
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subsitutePasswordFile = passwordFile: lib.mapAttrsToList subsitutePassword passwordFile.passwords;
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renderPasswordFile = passwordFile: "${lib.strings.concatStringsSep "| " (subsitutePasswordFile passwordFile)} < ${passwordFile.template}";
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installPasswordFile = passwordFile: ''
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install -C -o ${passwordFile.owner} -g ${passwordFile.group} -m ${passwordFile.mode} -d ${builtins.dirOf passwordFile.path}
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temp="$(mktemp)"
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trap 'rm "$temp"' ERR
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${renderPasswordFile passwordFile} > "$temp"
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install -C -o ${passwordFile.owner} -g ${passwordFile.group} -m ${passwordFile.mode} -T "$temp" ${passwordFile.path}
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rm "$temp"
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trap - ERR
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'';
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installPasswordFileApp = passwordFile: pkgs.writeShellApplication {
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name = builtins.replaceStrings ["/"] ["_"] passwordFile.path;
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runtimeInputs = with pkgs; [ gawk ];
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text = installPasswordFile passwordFile;
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};
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installPasswordFileSandboxed = passwordFile:
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''${lib.getExe (installPasswordFileApp passwordFile)} || echo Failed to install ${lib.strings.escapeShellArg passwordFile.path}'';
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in
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''
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echo Installing secrets...
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${lib.strings.concatLines (builtins.map installPasswordFileSandboxed passwordFiles)}
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'';
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};
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extraSystemBuilderCmds =
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let
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passwords = builtins.attrValues config.vivarium.passwords;
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readPasswordClear = password: "pass show ${lib.strings.escapeShellArg password.path}" + (
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if password.selector == null
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then " | head -n1"
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else
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(if password.selector == "@"
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then ""
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else " | tail -n +2 | yq -r '.${password.selector}'")
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);
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readPassword = password: (readPasswordClear password) + (lib.strings.optionalString (password.transform != null) " | ${password.transform}");
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gitPath = password: ''"$PASSWORD_STORE_DIR"/${lib.strings.escapeShellArg password.path}.gpg'';
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isGeneratedPassword = password: ''test -f ${gitPath password}'';
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dateGit = password: " " + ''(cd "$(dirname ${gitPath password})"; git log -n1 --format='format:%ct' "$(basename ${gitPath password})")'' + " ";
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dateStore = password: ''sudo stat -c '%Y' ${passwordStorePath password}'';
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isInStore = password: ''sudo test -f ${passwordStorePath password}'';
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testCanGenerate = password: lib.asserts.assertMsg (builtins.elem password.selector [ "@" null ]) "Unimplemented: generator + selector ${describePassword password}";
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generatePassword = password: assert testCanGenerate password; ''${password.generator} | pass insert -m ${lib.strings.escapeShellArg password.path}'';
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raiseCantGenerate = password: ''echo "Error: no generator" ; exit 1'';
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syncPasswordStore = password: ''
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# ${describePassword password}
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write=false
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if ${isInStore password}
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then
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if ${isGeneratedPassword password}
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then
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date_store="$(${dateStore password})"
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date_git="$(${dateGit password})"
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if [ "$date_git" -eq "$date_store" ]
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then
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echo ${lib.strings.escapeShellArg (describePassword password)}: up-to-date
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elif [ "$date_git" -gt "$date_store" ]
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then
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echo ${lib.strings.escapeShellArg (describePassword password)}: updating
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write=true
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else
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echo ERROR ${lib.strings.escapeShellArg (describePassword password)}: store is more recent than git
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exit 1
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fi
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else
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echo ERROR ${lib.strings.escapeShellArg (describePassword password)}: exists in store but not in git
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exit 1
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fi
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else
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if ${isGeneratedPassword password}
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then
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echo ${lib.strings.escapeShellArg (describePassword password)}: installing
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else
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echo ${lib.strings.escapeShellArg (describePassword password)}: generating
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${(if password.generator != null then generatePassword else raiseCantGenerate) password}
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fi
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write=true
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fi
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if [ "$write" = true ]
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then
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temp="$(mktemp)"
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trap 'rm "$temp"' ERR
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${readPassword password} > "$temp"
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touch -d @"$(${dateGit password})" "$temp"
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sudo install -o root -g root -m u=rw -p -T "$temp" ${lib.strings.escapeShellArg (passwordStorePath password)}
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rm "$temp"
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trap - ERR
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fi
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'';
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allFilenames = builtins.map (password: "${passwordStoreDir}/${passwordHash password}") passwords;
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in
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''
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ln -s ${lib.getExe (pkgs.writeShellApplication {
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name = "update-password-store";
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text = ''
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test -d "$PASSWORD_STORE_DIR"
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sudo install -C -o root -g root -m u=rwx -d "${passwordStoreDir}"
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${lib.strings.concatLines (builtins.map syncPasswordStore passwords)}
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comm -23 <(sudo find ${passwordStoreDir} -type f | sort) <(echo ${lib.strings.escapeShellArg (lib.strings.concatLines allFilenames)} | sort) | while read -r file
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do
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echo Removing "$file" from password store
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sudo rm "$file"
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done
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'';
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})} $out/bin/
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'';
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};
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vivarium.passwords =
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let
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passwordsList = lib.lists.flatten (map (f: builtins.attrValues f.passwords) passwordFiles);
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passwordsAttrs = map (password: { ${passwordHash password} = password; }) passwordsList;
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in
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lib.attrsets.mergeAttrsList passwordsAttrs;
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};
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options = {
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# Using vivarium because that's where it's from, and we don't want it in home manager's frogeye
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# TODO Make this cleaner, merge the two, somehow
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vivarium =
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let
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defaultvar = "@PASSWORD@";
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passwordSubmodule = lib.types.submodule ({ ... }: {
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options = {
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path = lib.mkOption {
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type = lib.types.str;
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description = "Path to the password store entry";
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};
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selector = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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description = "If unset, selects the first line. If '@', select everything. If any other value, will parse the password metadata as YML and use selector (yq).";
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};
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generator = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = "${lib.getExe pkgs.pwgen} -s 32";
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description = "Command to generate the password. Won't work when selector is set to read metadata.";
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};
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transform = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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description = "Shell command to transform the password with before substitution";
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};
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};
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});
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in
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{
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passwords = lib.mkOption {
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default = { };
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type = lib.types.attrsOf passwordSubmodule;
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};
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passwordFiles =
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lib.mkOption {
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default = { };
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type = lib.types.attrsOf (lib.types.submodule ({ name, config, ... }: {
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options = {
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path = lib.mkOption {
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type = lib.types.str;
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default = name;
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description = "Where to place the file.";
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};
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mode = lib.mkOption {
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type = lib.types.str;
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default = "0400";
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description = "Unix permission";
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};
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owner = lib.mkOption {
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type = lib.types.str;
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default = "root";
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description = "Owner of the secret file";
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};
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group = lib.mkOption {
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type = lib.types.str;
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default = "root";
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description = "Group of the secret file";
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};
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text = lib.mkOption {
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type = lib.types.str;
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default = defaultvar;
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description = "Content of the template used to make the file. Exclusive with `template`.";
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};
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template = lib.mkOption {
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type = lib.types.path;
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default = pkgs.writeText "password-template" config.text;
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description = "Content of the template used to make the file. Exclusive with `text`.";
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};
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passwords = lib.mkOption {
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default = lib.optionalAttrs (config.password != null) { ${defaultvar} = config.password; };
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type = lib.types.attrsOf passwordSubmodule;
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description = "Paths to passwords that will substitute the variables in the template. Exclusive with `password`";
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};
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password = lib.mkOption {
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type = passwordSubmodule;
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description = "Path to password that will substitute '@PASSWORD@' in the template. Exclusive with `passwords`.";
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};
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};
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}));
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};
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};
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};
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}
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