feat(NODE-6161): allow custom aws sdk config

src/client-side-encryption/auto_encrypter.ts

@@ -6,6 +6,7 @@ import {
 import * as net from 'net';
 
 import { deserialize, type Document, serialize } from '../bson';
+import { type AWSCredentialProvider } from '../cmap/auth/aws_temporary_credentials';
 import { type CommandOptions, type ProxyOptions } from '../cmap/connection';
 import { kDecorateResult } from '../constants';
 import { getMongoDBClientEncryption } from '../deps';
@@ -153,6 +154,7 @@ export class AutoEncrypter {
   _kmsProviders: KMSProviders;
   _bypassMongocryptdAndCryptShared: boolean;
   _contextCounter: number;
+  _awsCredentialProvider?: AWSCredentialProvider;
 
   _mongocryptdManager?: MongocryptdManager;
   _mongocryptdClient?: MongoClient;
@@ -327,6 +329,11 @@ export class AutoEncrypter {
    * This function is a no-op when bypassSpawn is set or the crypt shared library is used.
    */
   async init(): Promise<MongoClient | void> {
+    // This is handled during init() as the auto encrypter is instantiated during the client's
+    // parseOptions() call, so the client doesn't have its options set at that point.
+    this._awsCredentialProvider =
+      this._client.options.credentials?.mechanismProperties.AWS_CREDENTIAL_PROVIDER;
+
     if (this._bypassMongocryptdAndCryptShared || this.cryptSharedLibVersionInfo) {
       return;
     }
@@ -438,7 +445,7 @@ export class AutoEncrypter {
    * the original ones.
    */
   async askForKMSCredentials(): Promise<KMSProviders> {
-    return await refreshKMSCredentials(this._kmsProviders);
+    return await refreshKMSCredentials(this._kmsProviders, this._awsCredentialProvider);
   }
 
   /**

src/client-side-encryption/client_encryption.ts

@@ -15,6 +15,7 @@ import {
   type UUID
 } from '../bson';
 import { type AnyBulkWriteOperation, type BulkWriteResult } from '../bulk/common';
+import { type AWSCredentialProvider } from '../cmap/auth/aws_temporary_credentials';
 import { type ProxyOptions } from '../cmap/connection';
 import { type Collection } from '../collection';
 import { type FindCursor } from '../cursor/find_cursor';
@@ -81,6 +82,9 @@ export class ClientEncryption {
   /** @internal */
   _mongoCrypt: MongoCrypt;
 
+  /** @internal */
+  _awsCredentialProvider?: AWSCredentialProvider;
+
   /** @internal */
   static getMongoCrypt(): MongoCryptConstructor {
     const encryption = getMongoDBClientEncryption();
@@ -125,6 +129,8 @@ export class ClientEncryption {
     this._kmsProviders = options.kmsProviders || {};
     const { timeoutMS } = resolveTimeoutOptions(client, options);
     this._timeoutMS = timeoutMS;
+    this._awsCredentialProvider =
+      client.options.credentials?.mechanismProperties.AWS_CREDENTIAL_PROVIDER;
 
     if (options.keyVaultNamespace == null) {
       throw new MongoCryptInvalidArgumentError('Missing required option `keyVaultNamespace`');
@@ -712,7 +718,7 @@ export class ClientEncryption {
    * the original ones.
    */
   async askForKMSCredentials(): Promise<KMSProviders> {
-    return await refreshKMSCredentials(this._kmsProviders);
+    return await refreshKMSCredentials(this._kmsProviders, this._awsCredentialProvider);
   }
 
   static get libmongocryptVersion() {

src/client-side-encryption/providers/aws.ts

@@ -1,11 +1,17 @@
-import { AWSSDKCredentialProvider } from '../../cmap/auth/aws_temporary_credentials';
+import {
+  type AWSCredentialProvider,
+  AWSSDKCredentialProvider
+} from '../../cmap/auth/aws_temporary_credentials';
 import { type KMSProviders } from '.';
 
 /**
  * @internal
  */
-export async function loadAWSCredentials(kmsProviders: KMSProviders): Promise<KMSProviders> {
-  const credentialProvider = new AWSSDKCredentialProvider();
+export async function loadAWSCredentials(
+  kmsProviders: KMSProviders,
+  provider?: AWSCredentialProvider
+): Promise<KMSProviders> {
+  const credentialProvider = new AWSSDKCredentialProvider(provider);
 
   // We shouldn't ever receive a response from the AWS SDK that doesn't have a `SecretAccessKey`
   // or `AccessKeyId`.  However, TS says these fields are optional.  We provide empty strings

src/client-side-encryption/providers/index.ts

@@ -1,4 +1,5 @@
 import type { Binary } from '../../bson';
+import { type AWSCredentialProvider } from '../../cmap/auth/aws_temporary_credentials';
 import { loadAWSCredentials } from './aws';
 import { loadAzureCredentials } from './azure';
 import { loadGCPCredentials } from './gcp';
@@ -176,11 +177,14 @@ export function isEmptyCredentials(
  *
  * @internal
  */
-export async function refreshKMSCredentials(kmsProviders: KMSProviders): Promise<KMSProviders> {
+export async function refreshKMSCredentials(
+  kmsProviders: KMSProviders,
+  awsProvider?: AWSCredentialProvider
+): Promise<KMSProviders> {
   let finalKMSProviders = kmsProviders;
 
   if (isEmptyCredentials('aws', kmsProviders)) {
-    finalKMSProviders = await loadAWSCredentials(finalKMSProviders);
+    finalKMSProviders = await loadAWSCredentials(finalKMSProviders, awsProvider);
   }
 
   if (isEmptyCredentials('gcp', kmsProviders)) {

src/cmap/auth/aws_temporary_credentials.ts

@@ -21,6 +21,9 @@ export interface AWSTempCredentials {
   Expiration?: Date;
 }
 
+/** @public **/
+export type AWSCredentialProvider = () => Promise<AWSCredentials>;
+
 /**
  * @internal
  *
@@ -41,7 +44,20 @@ export abstract class AWSTemporaryCredentialProvider {
 
 /** @internal */
 export class AWSSDKCredentialProvider extends AWSTemporaryCredentialProvider {
-  private _provider?: () => Promise<AWSCredentials>;
+  private _provider?: AWSCredentialProvider;
+
+  /**
+   * Create the SDK credentials provider.
+   * @param credentialsProvider - The credentials provider.
+   */
+  constructor(credentialsProvider?: AWSCredentialProvider) {
+    super();
+
+    if (credentialsProvider) {
+      this._provider = credentialsProvider;
+    }
+  }
+
   /**
    * The AWS SDK caches credentials automatically and handles refresh when the credentials have expired.
    * To ensure this occurs, we need to cache the `provider` returned by the AWS sdk and re-use it when fetching credentials.

src/cmap/auth/mongo_credentials.ts

@@ -6,6 +6,7 @@ import {
   MongoInvalidArgumentError,
   MongoMissingCredentialsError
 } from '../../error';
+import type { AWSCredentialProvider } from './aws_temporary_credentials';
 import { GSSAPICanonicalizationValue } from './gssapi';
 import type { OIDCCallbackFunction } from './mongodb_oidc';
 import { AUTH_MECHS_AUTH_SRC_EXTERNAL, AuthMechanism } from './providers';
@@ -68,6 +69,8 @@ export interface AuthMechanismProperties extends Document {
   ALLOWED_HOSTS?: string[];
   /** The resource token for OIDC auth in Azure and GCP. */
   TOKEN_RESOURCE?: string;
+  /** A custom AWS credential provider to use. */
+  AWS_CREDENTIAL_PROVIDER?: AWSCredentialProvider;
 }
 
 /** @public */

src/cmap/auth/mongodb_aws.ts

@@ -9,6 +9,7 @@ import {
 import { ByteUtils, maxWireVersion, ns, randomBytes } from '../../utils';
 import { type AuthContext, AuthProvider } from './auth_provider';
 import {
+  type AWSCredentialProvider,
   AWSSDKCredentialProvider,
   type AWSTempCredentials,
   AWSTemporaryCredentialProvider,
@@ -34,11 +35,11 @@ interface AWSSaslContinuePayload {
 
 export class MongoDBAWS extends AuthProvider {
   private credentialFetcher: AWSTemporaryCredentialProvider;
-  constructor() {
+  constructor(credentialProvider?: AWSCredentialProvider) {
     super();
 
     this.credentialFetcher = AWSTemporaryCredentialProvider.isAWSSDKInstalled
-      ? new AWSSDKCredentialProvider()
+      ? new AWSSDKCredentialProvider(credentialProvider)
       : new LegacyAWSTemporaryCredentialProvider();
   }
 

src/deps.ts

@@ -78,7 +78,7 @@ export function getZstdLibrary(): ZStandardLib | { kModuleError: MongoMissingDep
 }
 
 /**
- * @internal
+ * @public
  * Copy of the AwsCredentialIdentityProvider interface from [`smithy/types`](https://socket.dev/npm/package/\@smithy/types/files/1.1.1/dist-types/identity/awsCredentialIdentity.d.ts),
  * the return type of the aws-sdk's `fromNodeProviderChain().provider()`.
  */

src/index.ts

@@ -128,10 +128,11 @@ export { ReadPreferenceMode } from './read_preference';
 export { ServerType, TopologyType } from './sdam/common';
 
 // Helper classes
+export type { AWSCredentialProvider } from './cmap/auth/aws_temporary_credentials';
+export type { AWSCredentials } from './deps';
 export { ReadConcern } from './read_concern';
 export { ReadPreference } from './read_preference';
 export { WriteConcern } from './write_concern';
-
 // events
 export {
   CommandFailedEvent,

src/mongo_client_auth_providers.ts

@@ -1,4 +1,5 @@
 import { type AuthProvider } from './cmap/auth/auth_provider';
+import { type AWSCredentialProvider } from './cmap/auth/aws_temporary_credentials';
 import { GSSAPI } from './cmap/auth/gssapi';
 import { type AuthMechanismProperties } from './cmap/auth/mongo_credentials';
 import { MongoDBAWS } from './cmap/auth/mongodb_aws';
@@ -13,8 +14,11 @@ import { X509 } from './cmap/auth/x509';
 import { MongoInvalidArgumentError } from './error';
 
 /** @internal */
-const AUTH_PROVIDERS = new Map<AuthMechanism | string, (workflow?: Workflow) => AuthProvider>([
-  [AuthMechanism.MONGODB_AWS, () => new MongoDBAWS()],
+const AUTH_PROVIDERS = new Map<AuthMechanism | string, (param?: any) => AuthProvider>([
+  [
+    AuthMechanism.MONGODB_AWS,
+    (credentialProvider?: AWSCredentialProvider) => new MongoDBAWS(credentialProvider)
+  ],
   [
     AuthMechanism.MONGODB_CR,
     () => {
@@ -65,6 +69,8 @@ export class MongoClientAuthProviders {
     let provider;
     if (name === AuthMechanism.MONGODB_OIDC) {
       provider = providerFunction(this.getWorkflow(authMechanismProperties));
+    } else if (name === AuthMechanism.MONGODB_AWS) {
+      provider = providerFunction(authMechanismProperties.AWS_CREDENTIAL_PROVIDER);
     } else {
       provider = providerFunction();
     }

test/integration/auth/mongodb_aws.test.ts

@@ -61,6 +61,34 @@ describe('MONGODB-AWS', function () {
     expect(result).to.be.a('number');
   });
 
+  context('when user supplies a credentials provider', function () {
+    beforeEach(function () {
+      if (!awsSdkPresent) {
+        this.skipReason = 'only relevant to AssumeRoleWithWebIdentity with SDK installed';
+        return this.skip();
+      }
+    });
+
+    it('authenticates with a user provided credentials provider', async function () {
+      // @ts-expect-error We intentionally access a protected variable.
+      const credentialProvider = AWSTemporaryCredentialProvider.awsSDK;
+      client = this.configuration.newClient(process.env.MONGODB_URI, {
+        authMechanismProperties: {
+          AWS_CREDENTIAL_PROVIDER: credentialProvider.fromNodeProviderChain()
+        }
+      });
+
+      const result = await client
+        .db('aws')
+        .collection('aws_test')
+        .estimatedDocumentCount()
+        .catch(error => error);
+
+      expect(result).to.not.be.instanceOf(MongoServerError);
+      expect(result).to.be.a('number');
+    });
+  });
+
   it('should allow empty string in authMechanismProperties.AWS_SESSION_TOKEN to override AWS_SESSION_TOKEN environment variable', function () {
     client = this.configuration.newClient(this.configuration.url(), {
       authMechanismProperties: { AWS_SESSION_TOKEN: '' }
@@ -351,11 +379,33 @@ describe('AWS KMS Credential Fetching', function () {
           : undefined;
       this.currentTest?.skipReason && this.skip();
     });
-    it('KMS credentials are successfully fetched.', async function () {
-      const { aws } = await refreshKMSCredentials({ aws: {} });
 
-      expect(aws).to.have.property('accessKeyId');
-      expect(aws).to.have.property('secretAccessKey');
+    context('when a credential provider is not providered', function () {
+      it('KMS credentials are successfully fetched.', async function () {
+        const { aws } = await refreshKMSCredentials({ aws: {} });
+
+        expect(aws).to.have.property('accessKeyId');
+        expect(aws).to.have.property('secretAccessKey');
+      });
+    });
+
+    context('when a credential provider is provided', function () {
+      let credentialProvider;
+
+      beforeEach(function () {
+        // @ts-expect-error We intentionally access a protected variable.
+        credentialProvider = AWSTemporaryCredentialProvider.awsSDK;
+      });
+
+      it('KMS credentials are successfully fetched.', async function () {
+        const { aws } = await refreshKMSCredentials(
+          { aws: {} },
+          credentialProvider.fromNodeProviderChain()
+        );
+
+        expect(aws).to.have.property('accessKeyId');
+        expect(aws).to.have.property('secretAccessKey');
+      });
     });
 
     it('does not return any extra keys for the `aws` credential provider', async function () {