feat(firefox): support custom policies.json (#35926)

docs/src/api/params.md

@@ -1071,6 +1071,8 @@ Whether to run browser in headless mode. More details for
 Firefox user preferences. Learn more about the Firefox user preferences at
 [`about:config`](https://support.mozilla.org/en-US/kb/about-config-editor-firefox).
 
+You can also provide a path to a custom [`policies.json` file](https://mozilla.github.io/policy-templates/) via `PLAYWRIGHT_FIREFOX_POLICIES_JSON` environment variable.
+
 ## csharp-java-browser-option-firefoxuserprefs
 * langs: csharp, java
 - `firefoxUserPrefs` <[Object]<[string], [any]>>
@@ -1078,6 +1080,8 @@ Firefox user preferences. Learn more about the Firefox user preferences at
 Firefox user preferences. Learn more about the Firefox user preferences at
 [`about:config`](https://support.mozilla.org/en-US/kb/about-config-editor-firefox).
 
+You can also provide a path to a custom [`policies.json` file](https://mozilla.github.io/policy-templates/) via `PLAYWRIGHT_FIREFOX_POLICIES_JSON` environment variable.
+
 ## browser-option-logger
 * langs: js
 - `logger` <[Logger]>

packages/playwright-client/types/types.d.ts

@@ -14899,6 +14899,9 @@ export interface BrowserType<Unused = {}> {
     /**
      * Firefox user preferences. Learn more about the Firefox user preferences at
      * [`about:config`](https://support.mozilla.org/en-US/kb/about-config-editor-firefox).
+     *
+     * You can also provide a path to a custom [`policies.json` file](https://mozilla.github.io/policy-templates/) via
+     * `PLAYWRIGHT_FIREFOX_POLICIES_JSON` environment variable.
      */
     firefoxUserPrefs?: { [key: string]: string|number|boolean; };
 
@@ -15323,6 +15326,9 @@ export interface BrowserType<Unused = {}> {
     /**
      * Firefox user preferences. Learn more about the Firefox user preferences at
      * [`about:config`](https://support.mozilla.org/en-US/kb/about-config-editor-firefox).
+     *
+     * You can also provide a path to a custom [`policies.json` file](https://mozilla.github.io/policy-templates/) via
+     * `PLAYWRIGHT_FIREFOX_POLICIES_JSON` environment variable.
      */
     firefoxUserPrefs?: { [key: string]: string|number|boolean; };
 
@@ -21730,6 +21736,9 @@ export interface LaunchOptions {
   /**
    * Firefox user preferences. Learn more about the Firefox user preferences at
    * [`about:config`](https://support.mozilla.org/en-US/kb/about-config-editor-firefox).
+   *
+   * You can also provide a path to a custom [`policies.json` file](https://mozilla.github.io/policy-templates/) via
+   * `PLAYWRIGHT_FIREFOX_POLICIES_JSON` environment variable.
    */
   firefoxUserPrefs?: { [key: string]: string|number|boolean; };
 

packages/playwright-core/types/types.d.ts

@@ -14899,6 +14899,9 @@ export interface BrowserType<Unused = {}> {
     /**
      * Firefox user preferences. Learn more about the Firefox user preferences at
      * [`about:config`](https://support.mozilla.org/en-US/kb/about-config-editor-firefox).
+     *
+     * You can also provide a path to a custom [`policies.json` file](https://mozilla.github.io/policy-templates/) via
+     * `PLAYWRIGHT_FIREFOX_POLICIES_JSON` environment variable.
      */
     firefoxUserPrefs?: { [key: string]: string|number|boolean; };
 
@@ -15323,6 +15326,9 @@ export interface BrowserType<Unused = {}> {
     /**
      * Firefox user preferences. Learn more about the Firefox user preferences at
      * [`about:config`](https://support.mozilla.org/en-US/kb/about-config-editor-firefox).
+     *
+     * You can also provide a path to a custom [`policies.json` file](https://mozilla.github.io/policy-templates/) via
+     * `PLAYWRIGHT_FIREFOX_POLICIES_JSON` environment variable.
      */
     firefoxUserPrefs?: { [key: string]: string|number|boolean; };
 
@@ -21730,6 +21736,9 @@ export interface LaunchOptions {
   /**
    * Firefox user preferences. Learn more about the Firefox user preferences at
    * [`about:config`](https://support.mozilla.org/en-US/kb/about-config-editor-firefox).
+   *
+   * You can also provide a path to a custom [`policies.json` file](https://mozilla.github.io/policy-templates/) via
+   * `PLAYWRIGHT_FIREFOX_POLICIES_JSON` environment variable.
    */
   firefoxUserPrefs?: { [key: string]: string|number|boolean; };
 

tests/assets/client-certificates/README.md

@@ -16,7 +16,7 @@ openssl req \
 
 ## Trusted client-certificate (server signed/valid)
 
-```
+```bash
 mkdir -p client/trusted
 # generate server-signed (valid) certifcate
 openssl req \
@@ -40,9 +40,39 @@ openssl x509 \
 openssl pkcs12 -export -out client/trusted/cert.pfx -inkey client/trusted/key.pem -in client/trusted/cert.pem -passout pass:secure
 ```
 
+## Trusted certificate for localhost (server signed/valid)
+
+```bash
+mkdir -p client/localhost
+
+# generate server-signed (valid) certifcate
+openssl req \
+	-newkey rsa:4096 \
+	-keyout client/localhost/localhost.key \
+	-out client/localhost/localhost.csr \
+	-nodes \
+	-days 365 \
+	-subj "/CN=localhost" \
+  -addext "subjectAltName=DNS:localhost,DNS:127.0.0.1"
+
+# put extensions
+echo "subjectAltName=DNS:localhost,DNS:127.0.0.1" > client/localhost/localhost.ext
+
+# sign with server_cert.pem
+openssl x509 \
+	-req \
+	-in client/localhost/localhost.csr \
+	-CA server/server_cert.pem \
+	-CAkey server/server_key.pem \
+	-set_serial 01 \
+	-out client/localhost/localhost.pem \
+	-days 365 \
+  -extfile client/localhost/localhost.ext
+```
+
 ## Self-signed certificate (invalid)
 
-```
+```bash
 mkdir -p client/self-signed
 openssl req \
 	-newkey rsa:4096 \

tests/assets/client-certificates/client/localhost/localhost.csr

@@ -0,0 +1,27 @@
+-----BEGIN CERTIFICATE REQUEST-----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+-----END CERTIFICATE REQUEST-----

tests/assets/client-certificates/client/localhost/localhost.ext

@@ -0,0 +1 @@
+subjectAltName=DNS:localhost,DNS:127.0.0.1

tests/assets/client-certificates/client/localhost/localhost.key

@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----

tests/assets/client-certificates/client/localhost/localhost.pem

@@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

tests/config/testserver/index.ts

@@ -58,7 +58,7 @@ export class TestServer {
 
   static async create(dirPath: string, port: number, loopback?: string): Promise<TestServer> {
     const server = new TestServer(dirPath, port, loopback);
-    await new Promise(x => server._server.once('listening', x));
+    await server.waitUntilReady();
     return server;
   }
 
@@ -68,7 +68,7 @@ export class TestServer {
       cert: await fs.promises.readFile(path.join(__dirname, 'cert.pem')),
       passphrase: 'aaaa',
     });
-    await new Promise(x => server._server.once('listening', x));
+    await server.waitUntilReady();
     return server;
   }
 
@@ -121,6 +121,10 @@ export class TestServer {
     this.EMPTY_PAGE = `${protocol}://${same_origin}:${port}/empty.html`;
   }
 
+  async waitUntilReady() {
+    await new Promise(x => this._server.once('listening', x));
+  }
+
   _onSocket(socket: net.Socket) {
     // ECONNRESET and HPE_INVALID_EOF_STATE are legit errors given
     // that tab closing aborts outgoing connections to the server.

tests/library/firefox/launcher.spec.ts

@@ -14,7 +14,9 @@
  * limitations under the License.
  */
 
+import fs from 'fs';
 import { playwrightTest as it, expect } from '../../config/browserTest';
+import { TestServer } from '../../config/testserver';
 
 it('should pass firefox user preferences', async ({ browserType, mode }) => {
   it.skip(mode.startsWith('service'));
@@ -43,3 +45,34 @@ it('should pass firefox user preferences in persistent', async ({ mode, launchPe
   const error = await page.goto('https://example.com').catch(e => e);
   expect(error.message).toContain('NS_ERROR_PROXY_CONNECTION_REFUSED');
 });
+
+it('should support custom firefox policies', async ({ browserType, mode, asset, loopback }, testInfo) => {
+  it.skip(mode.startsWith('service'));
+
+  const policies = {
+    'policies': {
+      'Certificates': {
+        'Install': [asset('client-certificates/server/server_cert.pem')],
+      },
+    },
+  };
+  const policiesPath = testInfo.outputPath('policies.json');
+  await fs.promises.writeFile(policiesPath, JSON.stringify(policies));
+
+  const port = 48112;
+  const server = new TestServer(asset(''), port, loopback, {
+    key: await fs.promises.readFile(asset('client-certificates/client/localhost/localhost.key')),
+    cert: await fs.promises.readFile(asset('client-certificates/client/localhost/localhost.pem')),
+  });
+  await server.waitUntilReady();
+
+  const browser = await browserType.launch({
+    env: { ...process.env, 'PLAYWRIGHT_FIREFOX_POLICIES_JSON': policiesPath },
+  });
+
+  const page = await browser.newPage();
+  await page.goto(server.PREFIX + '/frames/frame.html');
+  await expect(page.locator('body')).toHaveText(`Hi, I'm frame`);
+  await browser.close();
+  await server.stop();
+});