602 lines
19 KiB
Nix
602 lines
19 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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cfg = config.ringofstorms.secretsBao;
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mkJwtMintScript = pkgs.writeShellScript "zitadel-mint-jwt-impl" ''
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#!/usr/bin/env bash
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set -euo pipefail
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key_json="${cfg.zitadelKeyPath}"
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token_endpoint="${cfg.zitadelTokenEndpoint}"
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issuer="${cfg.zitadelIssuer}"
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debug_enabled="${if cfg.debugMint then "true" else "false"}"
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request_roles="${if cfg.requestProjectRoles then "true" else "false"}"
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debug() {
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if [ "$debug_enabled" = "true" ] || [ -n "${DEBUG:-}" ]; then
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echo "[zitadel-mint] $*" >&2
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fi
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}
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if [ ! -f "$key_json" ]; then
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echo "KEY_JSON not found: $key_json" >&2
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exit 1
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fi
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kid="$(${pkgs.jq}/bin/jq -r .keyId "$key_json")"
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sub="$(${pkgs.jq}/bin/jq -r .userId "$key_json")"
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pem_file="$(${pkgs.coreutils}/bin/mktemp)"
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trap '${pkgs.coreutils}/bin/rm -f "$pem_file"' EXIT
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${pkgs.jq}/bin/jq -r .key "$key_json" >"$pem_file"
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${pkgs.coreutils}/bin/chmod 600 "$pem_file"
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now="$(${pkgs.coreutils}/bin/date +%s)"
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exp="$(( now + ${toString cfg.jwtLifetimeSeconds} ))"
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jti="$(${pkgs.openssl}/bin/openssl rand -hex 16)"
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debug "kid=$kid sub=$sub iss=$sub aud=$issuer iat=$now exp=$exp jti=$jti"
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header="$(${pkgs.jq}/bin/jq -cn --arg kid "$kid" '{alg:"RS256",typ:"JWT",kid:$kid}')"
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payload="$(${pkgs.jq}/bin/jq -cn \
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--arg iss "$sub" \
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--arg sub "$sub" \
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--arg aud "$issuer" \
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--arg jti "$jti" \
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--argjson iat "$now" \
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--argjson exp "$exp" \
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'{iss:$iss,sub:$sub,aud:$aud,iat:$iat,exp:$exp,jti:$jti}'
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)"
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b64url() {
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${pkgs.openssl}/bin/openssl base64 -A | ${pkgs.gnused}/bin/sed -e 's/+/-/g' -e 's/\//_/g' -e 's/=*$//'
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}
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h64="$(${pkgs.coreutils}/bin/printf '%s' "$header" | b64url)"
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p64="$(${pkgs.coreutils}/bin/printf '%s' "$payload" | b64url)"
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sig="$(${pkgs.coreutils}/bin/printf '%s' "$h64.$p64" | ${pkgs.openssl}/bin/openssl dgst -sha256 -sign "$pem_file" | b64url)"
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assertion="$h64.$p64.$sig"
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scope="${cfg.zitadelScope}"
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roles_scope="urn:zitadel:iam:org:projects:roles"
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if [ -z "$scope" ]; then
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scope="openid urn:zitadel:iam:org:project:id:${cfg.zitadelProjectId}:aud"
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fi
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# Always request project roles unless explicitly disabled.
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if [ "$request_roles" = "true" ]; then
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if [[ " $scope " != *" $roles_scope "* ]]; then
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scope="$scope $roles_scope"
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fi
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fi
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debug "token_endpoint=$token_endpoint"
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debug "scope=$scope"
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response_with_status="$(${pkgs.curl}/bin/curl -sS --fail-with-body \
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--connect-timeout 3 --max-time 15 \
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--retry 8 --retry-delay 2 --retry-max-time 60 --retry-all-errors \
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-X POST "$token_endpoint" \
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-H 'content-type: application/x-www-form-urlencoded' \
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-w $'\n%{http_code}' \
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--data-urlencode 'grant_type=urn:ietf:params:oauth:grant-type:jwt-bearer' \
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--data-urlencode "assertion=$assertion" \
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--data-urlencode "scope=$scope" \
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)"
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http_status="${"$"}{response_with_status##*$'\n'}"
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response_body="${"$"}{response_with_status%$'\n'*}"
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if [ "$http_status" != "200" ]; then
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echo "token endpoint failed (HTTP $http_status):" >&2
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echo "$response_body" >&2
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exit 1
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fi
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if [ "${toString cfg.debugMint}" = "true" ]; then
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debug "token endpoint response: $response_body"
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fi
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access_token="$(${pkgs.coreutils}/bin/printf '%s' "$response_body" | ${pkgs.jq}/bin/jq -r '.access_token // empty')"
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id_token="$(${pkgs.coreutils}/bin/printf '%s' "$response_body" | ${pkgs.jq}/bin/jq -r '.id_token // empty')"
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decode_payload() {
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local token="$1"
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local payload_b64 payload_json
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payload_b64="$(${pkgs.coreutils}/bin/printf '%s' "$token" | ${pkgs.coreutils}/bin/cut -d. -f2)"
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payload_json="$(${pkgs.coreutils}/bin/printf '%s' "$payload_b64" | ${pkgs.jq}/bin/jq -Rr '
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gsub("-"; "+")
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| gsub("_"; "/")
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| . + ("=" * ((4 - (length % 4)) % 4))
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| @base64d
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' 2>/dev/null || true)"
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${pkgs.coreutils}/bin/printf '%s' "$payload_json"
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}
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has_roles_claim() {
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local token="$1"
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local payload
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payload="$(decode_payload "$token")"
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if [ -z "$payload" ]; then
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return 1
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fi
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${pkgs.jq}/bin/jq -e 'has("urn:zitadel:iam:org:projects:roles") or has("urn:zitadel:iam:org:project:roles") or has("flatRolesClaim")' <<<"$payload" >/dev/null 2>&1
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}
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token=""
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token_source=""
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if [[ "$access_token" == *.*.* ]] && has_roles_claim "$access_token"; then
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token="$access_token"
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token_source="access_token(with_roles)"
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elif [[ "$id_token" == *.*.* ]] && has_roles_claim "$id_token"; then
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token="$id_token"
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token_source="id_token(with_roles)"
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elif [[ "$access_token" == *.*.* ]]; then
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token="$access_token"
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token_source="access_token"
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elif [[ "$id_token" == *.*.* ]]; then
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token="$id_token"
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token_source="id_token"
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else
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echo "no JWT found in response (.access_token/.id_token)." >&2
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echo "Response was:" >&2
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echo "$response_body" >&2
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exit 1
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fi
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debug "selected=$token_source"
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if [ "${toString cfg.debugMint}" = "true" ] || [ -n "${DEBUG:-}" ]; then
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payload="$(decode_payload "$token")"
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if [ -n "$payload" ]; then
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debug "jwt.payload=$(echo "$payload" | ${pkgs.jq}/bin/jq -c '.')"
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else
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debug "jwt.payload=<decode_failed>"
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fi
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fi
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${pkgs.coreutils}/bin/printf '%s' "$token"
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'';
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zitadelMintJwt = pkgs.writeShellScriptBin "zitadel-mint-jwt" ''
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#!/usr/bin/env bash
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set -euo pipefail
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# Keep behavior consistent between CLI + systemd.
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export KEY_JSON="${cfg.zitadelKeyPath}"
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export TOKEN_ENDPOINT="${cfg.zitadelTokenEndpoint}"
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export ZITADEL_ISSUER="${cfg.zitadelIssuer}"
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export ZITADEL_PROJECT_ID="${cfg.zitadelProjectId}"
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export ZITADEL_SCOPE="${cfg.zitadelScope}"
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export ZITADEL_REQUEST_PROJECT_ROLES="${if cfg.requestProjectRoles then "true" else "false"}"
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if [ "${toString cfg.debugMint}" = "true" ]; then
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export DEBUG=1
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fi
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exec ${mkJwtMintScript}
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'';
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zitadelHost =
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let
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noProto = lib.strings.removePrefix "https://" (
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lib.strings.removePrefix "http://" cfg.zitadelTokenEndpoint
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);
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in
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builtins.head (lib.strings.splitString "/" noProto);
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mkAgentConfig = pkgs.writeText "vault-agent.hcl" ''
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vault {
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address = "${cfg.openBaoAddr}"
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}
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auto_auth {
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method "jwt" {
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mount_path = "${cfg.jwtAuthMountPath}"
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config = {
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role = "${cfg.openBaoRole}"
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path = "${cfg.zitadelJwtPath}"
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remove_jwt_after_reading = false
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}
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}
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sink "file" {
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config = {
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path = "${cfg.vaultAgentTokenPath}"
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mode = 0400
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}
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}
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}
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${lib.concatStringsSep "\n\n" (
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lib.mapAttrsToList (
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name: secret:
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let
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renderedTemplate =
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if secret.template != null then
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secret.template
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else
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''{{- with secret "${secret.kvPath}" -}}{{- .Data.data.${secret.field} -}}{{- end -}}'';
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in
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''
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template {
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destination = "${secret.path}"
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perms = "${secret.mode}"
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contents = <<EOH
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${renderedTemplate}
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EOH
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command = "${pkgs.runtimeShell} -c '${pkgs.coreutils}/bin/chown ${lib.escapeShellArg secret.owner}:${lib.escapeShellArg secret.group} ${lib.escapeShellArg secret.path} && ${pkgs.coreutils}/bin/chmod ${lib.escapeShellArg secret.mode} ${lib.escapeShellArg secret.path}'"
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}
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''
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) cfg.secrets
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)}
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'';
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in
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{
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options.age.secrets = lib.mkOption {
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type = lib.types.attrsOf lib.types.anything;
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default = { };
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description = "Compatibility shim for modules that expect config.age.secrets.<name>.path.";
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};
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options.ringofstorms.secretsBao = {
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enable = lib.mkEnableOption "Fetch runtime secrets via OpenBao";
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zitadelKeyPath = lib.mkOption {
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type = lib.types.str;
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default = "/machine-key.json";
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description = "Path to Zitadel service account key JSON (persistent, root-only).";
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};
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zitadelTokenEndpoint = lib.mkOption {
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type = lib.types.str;
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default = "https://sso.joshuabell.xyz/oauth/v2/token";
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};
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# If empty, the mint script will build a scope.
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zitadelScope = lib.mkOption {
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type = lib.types.str;
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default = "";
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};
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zitadelIssuer = lib.mkOption {
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type = lib.types.str;
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default = "https://sso.joshuabell.xyz";
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description = "Issuer / audience for the JWT bearer assertion (base URL, not /oauth/*).";
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};
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zitadelProjectId = lib.mkOption {
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type = lib.types.str;
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default = "";
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description = "Zitadel Project -> Resource ID (used to request aud scope).";
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};
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requestProjectRoles = lib.mkOption {
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type = lib.types.bool;
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default = true;
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description = "Request urn:zitadel:iam:org:projects:roles in scope.";
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};
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debugMint = lib.mkOption {
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type = lib.types.bool;
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default = false;
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description = "Enable verbose mint logs (stderr).";
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};
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jwtLifetimeSeconds = lib.mkOption {
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type = lib.types.int;
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default = 300;
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description = "Lifetime of signed assertion JWT sent to Zitadel token endpoint.";
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};
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zitadelJwtPath = lib.mkOption {
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type = lib.types.str;
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default = "/run/openbao/zitadel.jwt";
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};
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openBaoAddr = lib.mkOption {
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type = lib.types.str;
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default = "https://sec.joshuabell.xyz";
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};
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jwtAuthMountPath = lib.mkOption {
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type = lib.types.str;
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default = "auth/zitadel-jwt";
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};
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openBaoRole = lib.mkOption {
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type = lib.types.str;
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default = "machines";
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};
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vaultAgentTokenPath = lib.mkOption {
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type = lib.types.str;
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default = "/run/openbao/vault-agent.token";
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};
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secrets = lib.mkOption {
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type = lib.types.attrsOf (
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lib.types.submodule (
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{ name, ... }:
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{
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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 = "/run/secrets/${name}";
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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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};
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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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};
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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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};
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kvPath = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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description = "KV v2 secret API path (ex: kv/data/machines/home_roaming/nix2github).";
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};
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field = lib.mkOption {
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type = lib.types.str;
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default = "value";
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description = "Field under .Data.data to render.";
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};
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dependencies = lib.mkOption {
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type = lib.types.listOf lib.types.str;
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default = [ ];
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description = "Systemd service names to restart after this secret is rendered.";
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};
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configChanges = lib.mkOption {
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type = lib.types.attrs;
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default = { };
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description = "Extra config applied when enabled; supports '$SECRET_PATH' string substitution.";
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};
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template = lib.mkOption {
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type = lib.types.nullOr lib.types.lines;
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default = null;
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description = "Optional raw template contents (overrides kvPath/field).";
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};
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};
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}
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)
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);
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default = { };
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};
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};
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config = lib.mkIf cfg.enable (
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lib.mkMerge [
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{
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assertions = lib.mapAttrsToList (name: s: {
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assertion = (s.template != null) || (s.kvPath != null);
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message = "ringofstorms.secretsBao.secrets.${name} must set either template or kvPath";
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}) cfg.secrets;
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environment.systemPackages = [
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pkgs.jq
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pkgs.curl
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pkgs.openssl
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pkgs.openbao
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zitadelMintJwt
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];
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systemd.tmpfiles.rules = [
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"d /run/openbao 0700 root root - -"
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"f /run/openbao/zitadel.jwt 0400 root root - -"
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"d /run/secrets 0711 root root - -"
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];
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systemd.services = lib.mkMerge [
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{
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zitadel-mint-jwt = {
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description = "Mint Zitadel access token (JWT) for OpenBao";
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wantedBy = [ "multi-user.target" ];
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after = [
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"network-online.target"
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"nss-lookup.target"
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"NetworkManager-wait-online.service"
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"systemd-resolved.service"
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"time-sync.target"
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];
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wants = [
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"network-online.target"
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"NetworkManager-wait-online.service"
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"systemd-resolved.service"
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];
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serviceConfig = {
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Type = "oneshot";
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User = "root";
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Group = "root";
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Restart = "on-failure";
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RestartSec = "30s";
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TimeoutStartSec = "2min";
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UMask = "0077";
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ExecStart = pkgs.writeShellScript "zitadel-mint-jwt-service" ''
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#!/usr/bin/env bash
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set -euo pipefail
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if [ ! -d "/run/openbao" ]; then
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${pkgs.coreutils}/bin/mkdir -p /run/openbao
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${pkgs.coreutils}/bin/chmod 0700 /run/openbao
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fi
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if [ ! -f "${cfg.zitadelKeyPath}" ]; then
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echo "Missing Zitadel key JSON at ${cfg.zitadelKeyPath}" >&2
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exit 1
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fi
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echo "zitadel-mint-jwt: starting (host=${zitadelHost})" >&2
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# Best-effort: wait briefly for time sync + DNS.
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for i in {1..10}; do
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if ${pkgs.systemd}/bin/timedatectl show -p NTPSynchronized --value 2>/dev/null | ${pkgs.gnugrep}/bin/grep -qi true; then
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break
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fi
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sleep 1
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done
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for i in {1..10}; do
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if ${pkgs.systemd}/bin/resolvectl query ${zitadelHost} >/dev/null 2>&1; then
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break
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fi
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sleep 1
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done
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jwt_is_valid() {
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local token="$1"
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local payload_b64 payload_json exp now
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payload_b64="$(${pkgs.coreutils}/bin/printf '%s' "$token" | ${pkgs.coreutils}/bin/cut -d. -f2)"
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payload_b64="$(${pkgs.coreutils}/bin/printf '%s' "$payload_b64" | ${pkgs.gnused}/bin/sed -e 's/-/+/g' -e 's/_/\//g')"
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case $((${pkgs.coreutils}/bin/printf '%s' "$payload_b64" | ${pkgs.coreutils}/bin/wc -c)) in
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*1) payload_b64="$payload_b64=" ;;
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*2) payload_b64="$payload_b64==" ;;
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*3) : ;;
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*0) : ;;
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esac
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payload_json="$(${pkgs.coreutils}/bin/printf '%s' "$payload_b64" | ${pkgs.coreutils}/bin/base64 -d 2>/dev/null || true)"
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exp="$(${pkgs.jq}/bin/jq -r '.exp // empty' <<<"$payload_json" 2>/dev/null || true)"
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if [ -z "$exp" ]; then
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return 1
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fi
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now="$(${pkgs.coreutils}/bin/date +%s)"
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if [ "$exp" -gt $(( now + 60 )) ]; then
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return 0
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fi
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return 1
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}
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if [ -s "${cfg.zitadelJwtPath}" ] && jwt_is_valid "$(cat "${cfg.zitadelJwtPath}")"; then
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echo "zitadel-mint-jwt: existing token still valid; skipping" >&2
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exit 0
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fi
|
|
|
|
jwt="$(${zitadelMintJwt}/bin/zitadel-mint-jwt)"
|
|
|
|
if [ -z "$jwt" ] || [ "$jwt" = "null" ]; then
|
|
echo "Failed to mint Zitadel access token" >&2
|
|
exit 1
|
|
fi
|
|
|
|
tmp="$(${pkgs.coreutils}/bin/mktemp)"
|
|
trap '${pkgs.coreutils}/bin/rm -f "$tmp"' EXIT
|
|
${pkgs.coreutils}/bin/printf '%s' "$jwt" > "$tmp"
|
|
|
|
# In-place update so the agent's file watcher sees changes.
|
|
${pkgs.coreutils}/bin/cat "$tmp" > "${cfg.zitadelJwtPath}"
|
|
${pkgs.coreutils}/bin/chmod 0400 "${cfg.zitadelJwtPath}" || true
|
|
'';
|
|
};
|
|
};
|
|
|
|
vault-agent = {
|
|
description = "OpenBao agent for rendering secrets";
|
|
wantedBy = [ "multi-user.target" ];
|
|
after = [
|
|
"network-online.target"
|
|
"zitadel-mint-jwt.service"
|
|
];
|
|
wants = [
|
|
"network-online.target"
|
|
"zitadel-mint-jwt.service"
|
|
];
|
|
|
|
serviceConfig = {
|
|
Type = "simple";
|
|
User = "root";
|
|
Group = "root";
|
|
Restart = "on-failure";
|
|
RestartSec = "10s";
|
|
TimeoutStartSec = "30s";
|
|
UMask = "0077";
|
|
ExecStart = "${pkgs.openbao}/bin/bao agent -log-level=debug -config=${mkAgentConfig}";
|
|
};
|
|
};
|
|
}
|
|
|
|
(lib.mapAttrs' (
|
|
name: secret:
|
|
lib.nameValuePair "openbao-secret-${name}" {
|
|
description = "Wait for OpenBao secret ${name}";
|
|
after = [ "vault-agent.service" ];
|
|
requires = [ "vault-agent.service" ];
|
|
wantedBy = map (svc: "${svc}.service") secret.dependencies;
|
|
startLimitIntervalSec = 300;
|
|
startLimitBurst = 3;
|
|
|
|
serviceConfig = {
|
|
Type = "oneshot";
|
|
User = "root";
|
|
Group = "root";
|
|
UMask = "0077";
|
|
ExecStart = pkgs.writeShellScript "openbao-wait-secret-${name}" ''
|
|
#!/usr/bin/env bash
|
|
set -euo pipefail
|
|
|
|
p=${lib.escapeShellArg secret.path}
|
|
|
|
for i in {1..60}; do
|
|
if [ -s "$p" ]; then
|
|
break
|
|
fi
|
|
sleep 1
|
|
done
|
|
|
|
if [ ! -s "$p" ]; then
|
|
echo "Secret file not rendered: $p" >&2
|
|
exit 1
|
|
fi
|
|
|
|
${lib.concatStringsSep "\n" (map (svc: ''
|
|
echo "Restarting ${svc} due to secret ${name}" >&2
|
|
systemctl try-restart ${lib.escapeShellArg (svc + ".service")} || true
|
|
'') secret.dependencies)}
|
|
'';
|
|
};
|
|
}
|
|
) cfg.secrets)
|
|
];
|
|
|
|
age.secrets = lib.mapAttrs' (
|
|
name: secret:
|
|
lib.nameValuePair name {
|
|
file = null;
|
|
path = secret.path;
|
|
}
|
|
) cfg.secrets;
|
|
}
|
|
|
|
]
|
|
);
|
|
}
|