feat: implement OpenBao PKI certificate authentication

nodejs/utils/vault_cert.js

@@ -0,0 +1,44 @@
+'use strict';
+
+const conf = require('@simpleworkjs/conf');
+
+/**
+ * Requests a signed SSH certificate from the SSO Manager's OpenBao/Vault proxy.
+ *
+ * @param {string} publicKey - The jump host's public key (e.g. 'ssh-rsa AAAAB3...')
+ * @param {string} targetUid - The username the cert should be valid for
+ * @returns {Promise<string>} - The signed SSH certificate
+ */
+async function getSignedCert(publicKey, targetUid) {
+	const sso = conf.sso || {};
+	const pkiConfig = conf.ssh?.pki || {};
+	
+	const vaultRole = pkiConfig.role || 'jump-host-role';
+	const endpoint = `${sso.url}/api/vault/ssh/sign/${vaultRole}`;
+
+	const response = await fetch(endpoint, {
+		method: 'POST',
+		headers: {
+			'Authorization': `Bearer ${sso.apiToken}`,
+			'Content-Type': 'application/json'
+		},
+		body: JSON.stringify({
+			public_key: publicKey,
+			valid_principals: targetUid
+		})
+	});
+
+	if (!response.ok) {
+		const errText = await response.text().catch(() => '');
+		throw new Error(`Failed to sign SSH cert (status ${response.status}): ${errText}`);
+	}
+
+	const data = await response.json();
+	if (!data.data || !data.data.signed_key) {
+		throw new Error('Vault response missing signed_key');
+	}
+
+	return data.data.signed_key;
+}
+
+module.exports = { getSignedCert };