238 lines
8.4 KiB
Bash
Executable file
238 lines
8.4 KiB
Bash
Executable file
#!/usr/bin/env bash
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set -Eeuo pipefail
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#
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# setup-vault-agent-proxy-config2.sh
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#
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# Purpose:
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# Create a *user* systemd Vault Agent that periodically fetches the ISSUING CA
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# (chain) for a proxy and writes it to the desired path.
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# - Own AppRole (no clash with leaf issuer)
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# - Renders to ~/.vault-agent-<app>-ca/.ca.json
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# - Calls YOUR post-hook with CHAIN_FILE to write the chain
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#
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# Usage:
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# VAULT_ADMIN_TOKEN=hvs.XXXX \
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# sudo -E ./setup-vault-agent-proxy-config2.sh --env test --config ./config/apps.yaml --app nctest
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#
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# Requirements: vault, python3, jq, openssl (jq used by post-hook), setcap/getcap (optional)
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if [[ -t 1 ]]; then
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BOLD=$'\e[1m'; RESET=$'\e[0m'; BLUE=$'\e[34m'; GREEN=$'\e[32m'; YELLOW=$'\e[33m'; RED=$'\e[31m'
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else BOLD=""; RESET=""; BLUE=""; GREEN=""; YELLOW=""; RED=""; fi
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ts(){ date +"%Y-%m-%d %H:%M:%S"; }
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info(){ echo -e "🟦 ${BLUE}${BOLD}[$(ts)]${RESET} $*"; }
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ok(){ echo -e "🟩 ${GREEN}${BOLD}[$(ts)]${RESET} $*"; }
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warn(){ echo -e "🟨 ${YELLOW}${BOLD}[$(ts)]${RESET} $*"; }
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err(){ echo -e "🟥 ${RED}${BOLD}[$(ts)]${RESET} $*" >&2; }
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: "${LOG_LEVEL:=info}"
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: "${VAULT_BIN:=/usr/bin/vault}"
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: "${SYSTEMD_BIN:=/usr/bin/systemctl}"
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: "${DEFAULT_CONFIG:=./config/apps.yaml}"
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: "${DEFAULT_ENV:=test}"
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[[ -n "${VAULT_ADMIN_TOKEN:-}" ]] || { err "VAULT_ADMIN_TOKEN missing"; exit 2; }
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ENV_NAME="$DEFAULT_ENV"; CFG="$DEFAULT_CONFIG"; APPN=""
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while [[ $# -gt 0 ]]; do
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case "$1" in
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--env) ENV_NAME="$2"; shift 2;;
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--config) CFG="$2"; shift 2;;
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--app) APPN="$2"; shift 2;;
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-h|--help) sed -n '1,200p' "$0"; exit 0;;
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*) err "unknown arg: $1"; exit 2;;
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esac
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done
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[[ -n "$APPN" ]] || { err "--app is required"; exit 2; }
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need(){ command -v "$1" >/dev/null || { err "missing: $1"; exit 2; }; }
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need python3; need jq; need "$VAULT_BIN"
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SCRIPT_DIR="$(cd -- "$(dirname -- "$0")" && pwd)"
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POST_SRC="${SCRIPT_DIR}/scripts/vault-agent-post.sh"
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[[ -r "$POST_SRC" ]] || { err "post script missing: $POST_SRC"; exit 4; }
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CFG_ABS="$(readlink -f "$CFG")"
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CFGJSON="$(python3 - <<PY
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import yaml, json
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with open("$CFG_ABS","r",encoding="utf-8") as f:
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print(json.dumps(yaml.safe_load(f)))
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PY
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)"
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jqenv(){ echo "$CFGJSON" | jq -r ".environments.\"$ENV_NAME\"$1"; }
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jqapp(){ echo "$CFGJSON" | jq -r ".apps[] | select(.name==\"$APPN\")$1"; }
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VAULT_ADDR="$(jqenv '.vault_addr')"
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PKI_MOUNT="$(jqenv '.pki_mount')"
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[[ "$VAULT_ADDR" != "null" && "$PKI_MOUNT" != "null" ]] || { err "incomplete env config"; exit 2; }
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PROXY_USER_DEF="$(jqenv '.proxy.user')"
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CHAIN_PATH_DEF="$(jqenv '.proxy.chain_path')"
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PROXY_USER_APP="$(jqapp '.proxy_user')"
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CHAIN_PATH_APP="$(jqapp '.proxy_chain_path')"
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PROXY_USER="$PROXY_USER_DEF"; [[ "$PROXY_USER_APP" != "null" ]] && PROXY_USER="$PROXY_USER_APP"
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CHAIN_PATH="$CHAIN_PATH_DEF"; [[ "$CHAIN_PATH_APP" != "null" ]] && CHAIN_PATH="$CHAIN_PATH_APP"
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[[ -n "$PROXY_USER" && -n "$CHAIN_PATH" ]] || { err "missing required fields (proxy.user / proxy.chain_path)"; exit 2; }
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export VAULT_ADDR VAULT_TOKEN="${VAULT_ADMIN_TOKEN}"
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ROLE_NAME="${APPN}-pki-ca"
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POLICY_BOOT="pki-ca-bootstrap-${APPN}"
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POLICY_RUN="pki-ca-read-${APPN}"
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HOME_DIR="/home/${PROXY_USER}"
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AGENT_DIR="${HOME_DIR}/.vault-agent-${APPN}-ca"
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RID="${AGENT_DIR}/role_id"
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SID="${AGENT_DIR}/secret_id"
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TOKEN_FILE="${AGENT_DIR}/token"
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POST="${AGENT_DIR}/bin/vault-agent-post.sh"
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UNIT="${HOME_DIR}/.config/systemd/user/vault-agent-${APPN}-ca.service"
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OUTDIR="${HOME_DIR}/vault/mtls"
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CA_DIR="${HOME_DIR}/vault/ca"
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CA_FILE="${CA_DIR}/ca.pem"
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info "env=${BOLD}${ENV_NAME}${RESET} VAULT=${VAULT_ADDR} PKI=${PKI_MOUNT}"
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info "proxy for app=${BOLD}${APPN}${RESET} user=${BOLD}${PROXY_USER}${RESET}"
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info "chain_path=${BOLD}${CHAIN_PATH}${RESET}"
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id -u "${PROXY_USER}" >/dev/null 2>&1 || { err "linux user ${PROXY_USER} missing"; exit 3; }
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sudo install -d -m 0700 -o "${PROXY_USER}" -g "${PROXY_USER}" "${AGENT_DIR}"
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sudo install -d -m 0755 -o "${PROXY_USER}" -g "${PROXY_USER}" "${AGENT_DIR}/bin"
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sudo install -d -m 0755 -o "${PROXY_USER}" -g "${PROXY_USER}" "$(dirname "${CHAIN_PATH}")"
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sudo install -d -m 0755 -o "${PROXY_USER}" -g "${PROXY_USER}" "${CA_DIR}"
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if ! sudo -u "${PROXY_USER}" test -s "${CA_FILE}"; then
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warn "CA file not found for ${PROXY_USER}: ${CA_FILE} (agent HTTPS verify may fail). Distribute your root/chain first."
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fi
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TMP="$(mktemp)"
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cat >"$TMP" <<EOF
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path "auth/approle/role/${ROLE_NAME}/role-id" { capabilities=["read"] }
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path "auth/approle/role/${ROLE_NAME}/secret-id" { capabilities=["create","update"] }
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EOF
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${VAULT_BIN} policy write "${POLICY_BOOT}" "$TMP" >/dev/null
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cat >"$TMP" <<EOF
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path "${PKI_MOUNT}/cert/ca" { capabilities=["read"] }
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path "auth/token/renew-self" { capabilities=["update"] }
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EOF
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${VAULT_BIN} policy write "${POLICY_RUN}" "$TMP" >/dev/null
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rm -f "$TMP"
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${VAULT_BIN} auth enable approle >/dev/null 2>&1 || true
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${VAULT_BIN} write "auth/approle/role/${ROLE_NAME}" \
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policies="${POLICY_RUN}" bind_secret_id=true \
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token_type=service token_period=24h secret_id_ttl=0 secret_id_num_uses=0 >/dev/null
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RID_VAL="$(${VAULT_BIN} read -field=role_id "auth/approle/role/${ROLE_NAME}/role-id")"
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SID_VAL="$(${VAULT_BIN} write -f -field=secret_id "auth/approle/role/${ROLE_NAME}/secret-id")"
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sudo bash -c "umask 077; printf '%s' '${RID_VAL}' > '${RID}'; chown ${PROXY_USER}:${PROXY_USER} '${RID}'; chmod 600 '${RID}'"
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sudo bash -c "umask 077; printf '%s' '${SID_VAL}' > '${SID}'; chown ${PROXY_USER}:${PROXY_USER} '${SID}'; chmod 600 '${SID}'"
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sudo -u "${PROXY_USER}" tee "${AGENT_DIR}/vault-agent.hcl" >/dev/null <<HCL
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pid_file = "${AGENT_DIR}/pidfile"
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vault {
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address = "${VAULT_ADDR}"
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ca_cert = "${CA_FILE}"
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tls_server_name = "vault.test.local"
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client_cert = "${OUTDIR}/agent.crt"
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client_key = "${OUTDIR}/agent.key"
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}
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auto_auth {
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method "approle" {
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config = {
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role_id_file_path = "${RID}"
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secret_id_file_path = "${SID}"
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remove_secret_id_file_after_reading = false
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}
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}
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sink "file" {
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config = {
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path = "${TOKEN_FILE}"
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mode = 0600
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}
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}
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}
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template {
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source = "${AGENT_DIR}/ca.tpl"
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destination = "${AGENT_DIR}/.ca.json"
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command = "CHAIN_FILE='${CHAIN_PATH}' RELOAD_TLS_LABEL='tls=true' ${POST}"
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}
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HCL
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sudo -u "${PROXY_USER}" tee "${AGENT_DIR}/ca.tpl" >/dev/null <<TPL
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{{ with secret "${PKI_MOUNT}/cert/ca" }}
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{ "issuing_ca": {{ toJSON .Data.certificate }} }
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{{ end }}
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TPL
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sudo /usr/bin/install -m 0755 -o "${PROXY_USER}" -g "${PROXY_USER}" -D "$POST_SRC" "${POST}"
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sudo -u "${PROXY_USER}" install -d -m 0755 "${HOME_DIR}/.config/systemd/user"
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sudo -u "${PROXY_USER}" tee "${UNIT}" >/dev/null <<UNIT
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[Unit]
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Description=Vault Agent (${APPN}-ca) - refresh proxy CA chain
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Wants=network-online.target
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After=network-online.target
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[Service]
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Type=simple
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WorkingDirectory=${AGENT_DIR}
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Environment=VAULT_ADDR=${VAULT_ADDR}
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ExecStart=/usr/bin/vault agent -log-level=${LOG_LEVEL} -config=${AGENT_DIR}/vault-agent.hcl
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Restart=on-failure
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RestartSec=5s
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# Hardening
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#NoNewPrivileges=true
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#PrivateTmp=true
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#ProtectSystem=strict
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#ProtectHome=read-only
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#ReadOnlyPaths=${CA_DIR}
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#ReadWritePaths=${AGENT_DIR} $(dirname "${CHAIN_PATH}")
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#ProtectKernelTunables=true
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#ProtectKernelModules=true
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#ProtectControlGroups=true
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#LockPersonality=true
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#MemoryDenyWriteExecute=true
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#RestrictSUIDSGID=true
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#RestrictNamespaces=true
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[Install]
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WantedBy=default.target
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UNIT
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# OPTIONAL: remove file caps from vault binary (prevents 218/CAPABILITIES)
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if command -v getcap >/dev/null 2>&1; then
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VBIN="$(command -v vault || echo "$VAULT_BIN")"
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CAPS="$(getcap "$VBIN" 2>/dev/null || true)"
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if [[ -n "${CAPS// }" ]]; then
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info "vault binary has file capabilities → ${CAPS}"
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if [[ $EUID -eq 0 ]]; then
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setcap -r "$VBIN" && ok "removed file capabilities from $VBIN" || warn "setcap -r failed (non-fatal)"
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else
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warn "run as root to remove caps: sudo setcap -r '$VBIN'"
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fi
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fi
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fi
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PROXY_UID="$(id -u "${PROXY_USER}")"
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loginctl enable-linger "${PROXY_USER}" >/dev/null || true
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${SYSTEMD_BIN} start "user@${PROXY_UID}.service" >/dev/null || true
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XDG_RUNTIME_DIR="/run/user/${PROXY_UID}"
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mkdir -p "$XDG_RUNTIME_DIR" && chown "${PROXY_USER}:${PROXY_USER}" "$XDG_RUNTIME_DIR" || true
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sudo -u "${PROXY_USER}" XDG_RUNTIME_DIR="${XDG_RUNTIME_DIR}" ${SYSTEMD_BIN} --user daemon-reload
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sudo -u "${PROXY_USER}" XDG_RUNTIME_DIR="${XDG_RUNTIME_DIR}" ${SYSTEMD_BIN} --user enable --now "vault-agent-${APPN}-ca.service"
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if sudo -u "${PROXY_USER}" test -s "${CHAIN_PATH}"; then
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ok "CA chain present: ${CHAIN_PATH}"
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else
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warn "CA chain not found yet: ${CHAIN_PATH} → check journal"
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fi
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