feat: Recommending using OIDC (#871)

* Recommending using OIDC

* Added tests

* fix test and package

* update readme

---------

Co-authored-by: peterwoodworth <[email protected]>

Author: jplock

README.md

@@ -9,6 +9,14 @@ calls.
 
 ### Recent News
 
+#### Long-term credentials warning (10/2/23)
+
+We have added a warning when using long-term credentials to access AWS
+(IAM access keys and secret keys). Using long-term credentials requires you
+to create IAM users and properly secure the access keys to prevent their disclosure.
+A better approach is to use [GitHub's support for OpenID Connect](#OIDC) to authenticate
+using an IAM role to generate temporary security credentials.
+
 #### v4 Announcement (9/11/23)
 
 We have just released `v4` of Configure AWS Credentials. The only thing that

THIRD-PARTY

@@ -3307,6 +3307,210 @@ Apache-2.0
    limitations under the License.
 
 
+@aws-sdk/region-config-resolver
+Apache-2.0
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 @aws-sdk/token-providers
 Apache-2.0
 Apache License

dist/index.js

@@ -56,6 +56,12 @@ async function assumeRoleWithWebIdentityTokenFile(
 
 async function assumeRoleWithCredentials(params: AssumeRoleCommandInput, client: STSClient) {
   core.info('Assuming role with user credentials');
+  if (!process.env['AWS_SESSION_TOKEN']) {
+    core.warning(
+      'To avoid using long-term AWS credentials, please update your workflows to authenticate using OpenID Connect.' +
+        ' See https://s12d.com/gha-oidc-aws for more information.'
+    );
+  }
   try {
     const creds = await client.send(new AssumeRoleCommand({ ...params }));
     return creds;

src/assumeRole.ts

@@ -105,6 +105,9 @@ describe('Configure AWS Credentials', () => {
     jest.spyOn(core, 'info').mockImplementation((string) => {
       return string;
     });
+    jest.spyOn(core, 'warning').mockImplementation((string) => {
+      return string;
+    });
     (fromEnv as jest.Mock)
       .mockImplementationOnce(() => () => ({
         accessKeyId: FAKE_ACCESS_KEY_ID,
@@ -868,4 +871,23 @@ describe('Configure AWS Credentials', () => {
 
     expect(core.setOutput).toHaveBeenCalledTimes(4);
   });
+
+  test('prints warning for access key usage and no session token', async () => {
+    jest.spyOn(core, 'getInput').mockImplementation(mockGetInput(ASSUME_ROLE_INPUTS));
+
+    await run();
+
+    expect(core.warning).toHaveBeenCalledWith(
+      'To avoid using long-term AWS credentials, please update your workflows to authenticate using OpenID Connect.' +
+        ' See https://s12d.com/gha-oidc-aws for more information.'
+    );
+  });
+
+  test('skips warning for access key usage with session token', async () => {
+    jest.spyOn(core, 'getInput').mockImplementation(mockGetInput(DEFAULT_INPUTS));
+
+    await run();
+
+    expect(core.warning).toHaveBeenCalledTimes(0);
+  });
 });