fix(onboard): omit TLS servername for IP-literal gateway health probe hosts

src/lib/onboard/gateway-http-readiness.test.ts

@@ -1,12 +1,17 @@
 // SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 // SPDX-License-Identifier: Apache-2.0
 
+import { EventEmitter } from "node:events";
+import fs from "node:fs";
 import http from "node:http";
+import http2 from "node:http2";
 import type { AddressInfo } from "node:net";
+import os from "node:os";
+import path from "node:path";
 
-import { afterEach, describe, expect, it } from "vitest";
+import { afterEach, describe, expect, it, vi } from "vitest";
 
-import { isGatewayHttpReady } from "./gateway-http-readiness";
+import { isDockerDriverGatewayHttpReady, isGatewayHttpReady } from "./gateway-http-readiness";
 
 const servers: http.Server[] = [];
 
@@ -84,3 +89,95 @@ describe("isGatewayHttpReady abort handling", () => {
     await expect(probe).resolves.toBe(false);
   });
 });
+
+describe("isDockerDriverGatewayHttpReady TLS servername", () => {
+  const tlsDirs: string[] = [];
+
+  afterEach(() => {
+    for (const dir of tlsDirs.splice(0)) {
+      fs.rmSync(dir, { force: true, recursive: true });
+    }
+  });
+
+  function writeLocalTlsDir(): string {
+    const tlsDir = fs.mkdtempSync(path.join(os.tmpdir(), "gateway-tls-"));
+    tlsDirs.push(tlsDir);
+    fs.writeFileSync(path.join(tlsDir, "ca.crt"), "ca");
+    fs.mkdirSync(path.join(tlsDir, "client"));
+    fs.writeFileSync(path.join(tlsDir, "client", "tls.crt"), "cert");
+    fs.writeFileSync(path.join(tlsDir, "client", "tls.key"), "key");
+    return tlsDir;
+  }
+
+  function healthySessionStub(): http2.ClientHttp2Session {
+    const stream = new EventEmitter() as EventEmitter & {
+      close: () => void;
+      end: (payload?: Buffer) => void;
+    };
+    stream.close = () => undefined;
+    stream.end = () => {
+      setImmediate(() => {
+        stream.emit("response", {
+          [http2.constants.HTTP2_HEADER_STATUS]: 200,
+          [http2.constants.HTTP2_HEADER_CONTENT_TYPE]: "application/grpc",
+          "grpc-status": "0",
+        });
+        stream.emit("end");
+      });
+    };
+    const client = new EventEmitter() as EventEmitter & {
+      close: () => void;
+      request: () => typeof stream;
+    };
+    client.close = () => undefined;
+    client.request = () => stream;
+    return client as unknown as http2.ClientHttp2Session;
+  }
+
+  function spyOnHttp2Connect() {
+    return vi.spyOn(http2, "connect").mockImplementation(() => healthySessionStub());
+  }
+
+  function connectOptionsFrom(
+    connect: ReturnType<typeof spyOnHttp2Connect>,
+  ): Record<string, unknown> {
+    expect(connect).toHaveBeenCalledTimes(1);
+    return connect.mock.calls[0]?.[1] as Record<string, unknown>;
+  }
+
+  it("omits servername for an IP-literal gateway host, which Node 25 rejects as a TLS ServerName (#7527)", async () => {
+    vi.stubEnv("OPENSHELL_LOCAL_TLS_DIR", writeLocalTlsDir());
+    const connect = spyOnHttp2Connect();
+
+    await expect(
+      isDockerDriverGatewayHttpReady(1_000, "https://127.0.0.1:8080/openshell.v1.OpenShell/Health"),
+    ).resolves.toBe(true);
+
+    expect(connectOptionsFrom(connect)).not.toHaveProperty("servername");
+  });
+
+  it("omits servername for a bracketed IPv6 gateway host (#7527)", async () => {
+    vi.stubEnv("OPENSHELL_LOCAL_TLS_DIR", writeLocalTlsDir());
+    const connect = spyOnHttp2Connect();
+
+    await expect(
+      isDockerDriverGatewayHttpReady(1_000, "https://[::1]:8080/openshell.v1.OpenShell/Health"),
+    ).resolves.toBe(true);
+
+    expect(connectOptionsFrom(connect)).not.toHaveProperty("servername");
+  });
+
+  it("keeps servername for a DNS gateway hostname (#7527)", async () => {
+    vi.stubEnv("OPENSHELL_LOCAL_TLS_DIR", writeLocalTlsDir());
+    const connect = spyOnHttp2Connect();
+
+    await expect(
+      isDockerDriverGatewayHttpReady(
+        1_000,
+        "https://host.openshell.internal:8080/openshell.v1.OpenShell/Health",
+      ),
+    ).resolves.toBe(true);
+
+    expect(connectOptionsFrom(connect).servername).toBe("host.openshell.internal");
+  });
+});

src/lib/onboard/gateway-http-readiness.ts

@@ -13,6 +13,7 @@
 import fs from "node:fs";
 import http from "node:http";
 import http2 from "node:http2";
+import net from "node:net";
 import path from "node:path";
 
 import { getGatewayHttpEndpoint, getGatewayHttpsEndpoint } from "../core/gateway-address";
@@ -229,13 +230,21 @@ function dockerDriverGatewayHttp2ConnectOptions(
   const localTlsDir = process.env.OPENSHELL_LOCAL_TLS_DIR;
   if (!localTlsDir) return undefined;
   try {
-    return {
+    const options: http2.SecureClientSessionOptions = {
       ca: fs.readFileSync(path.join(localTlsDir, "ca.crt")),
       cert: fs.readFileSync(path.join(localTlsDir, "client", "tls.crt")),
       key: fs.readFileSync(path.join(localTlsDir, "client", "tls.key")),
       rejectUnauthorized: true,
-      servername: parsed.hostname,
     };
+    // Node 25 rejects an IP-literal TLS ServerName (RFC 6066; DEP0123 became a
+    // thrown error). For IP endpoints, certificate verification matches the
+    // connection IP against the certificate's IP SANs without SNI, so only
+    // send servername for DNS hostnames.
+    const bareHostname = parsed.hostname.replace(/^\[(.*)\]$/, "$1");
+    if (net.isIP(bareHostname) === 0) {
+      options.servername = parsed.hostname;
+    }
+    return options;
   } catch {
     return undefined;
   }