├── .gitignore ├── trust-policy.json ├── tsconfig.json ├── lambda-role-policy.json ├── package.json ├── lambda-skeleton.json ├── src └── index.ts ├── README.md └── LICENSE /.gitignore: -------------------------------------------------------------------------------- 1 | /dist/ 2 | /node_modules/ 3 | ./migrate-cognito-user-pool.zip 4 | 5 | package-lock.json 6 | migrate-cognito-user-pool.zip 7 | -------------------------------------------------------------------------------- /trust-policy.json: -------------------------------------------------------------------------------- 1 | { 2 | "Version": "2012-10-17", 3 | "Statement": [ 4 | { 5 | "Effect": "Allow", 6 | "Principal": { 7 | "Service": "lambda.amazonaws.com" 8 | }, 9 | "Action": "sts:AssumeRole" 10 | } 11 | ] 12 | } -------------------------------------------------------------------------------- /tsconfig.json: -------------------------------------------------------------------------------- 1 | { 2 | "compilerOptions": { 3 | "target": "es2017", 4 | "module": "commonjs", 5 | "outDir": "./dist", 6 | "strict": true, 7 | "baseUrl": "./", 8 | "typeRoots": [ 9 | "node_modules/@types" 10 | ], 11 | "types": [ 12 | "node" 13 | ], 14 | "esModuleInterop": true, 15 | "inlineSourceMap": true 16 | } 17 | } 18 | -------------------------------------------------------------------------------- /lambda-role-policy.json: -------------------------------------------------------------------------------- 1 | { 2 | "Version": "2012-10-17", 3 | "Statement": [ 4 | { 5 | "Sid": "VisualEditor0", 6 | "Effect": "Allow", 7 | "Action": [ 8 | "cognito-idp:AdminInitiateAuth", 9 | "cognito-idp:AdminGetUser" 10 | ], 11 | "Resource": "arn:aws:cognito-idp:XXXXXXXXXXX" 12 | } 13 | ] 14 | } -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "migrate-cognito-user-pool-lambda", 3 | "version": "0.1.0", 4 | "description": "AWS Lambda to migrate users from one Cognito user pool to another", 5 | "scripts": { 6 | "build": "tsc && (cd dist/ && zip -r ../migrate-cognito-user-pool.zip *)" 7 | }, 8 | "devDependencies": { 9 | "typescript": "^3.7.3" 10 | }, 11 | "license": "Apache-2.0", 12 | "dependencies": { 13 | "@types/aws-lambda": "^8.10.46", 14 | "@types/node": "^12.12.15", 15 | "aws-sdk": "^2.585.0" 16 | } 17 | } 18 | -------------------------------------------------------------------------------- /lambda-skeleton.json: -------------------------------------------------------------------------------- 1 | { 2 | "FunctionName": "test-migration-cognitio", 3 | "Runtime": "nodejs14.x", 4 | "Role": "ROLE_ARN", 5 | "Handler": "index.handler", 6 | "Code": { 7 | "ZipFile": "fileb://migrate-cognito-user-pool.zip" 8 | }, 9 | "Description": "Migrate users from an Older Cognito to Newer Cognito", 10 | "Timeout": 3, 11 | "MemorySize": 128, 12 | "Publish": true, 13 | "Environment": { 14 | "Variables": { 15 | "OLD_CLIENT_ID": "XXX", 16 | "OLD_USER_POOL_ID": "XXX", 17 | "OLD_USER_POOL_REGION": "XXX" 18 | } 19 | } 20 | 21 | } 22 | -------------------------------------------------------------------------------- /src/index.ts: -------------------------------------------------------------------------------- 1 | import { CognitoUserPoolTriggerEvent, Context } from 'aws-lambda'; 2 | import { AWSError, CognitoIdentityServiceProvider, ChainableTemporaryCredentials } from 'aws-sdk'; 3 | import { AdminInitiateAuthRequest } from 'aws-sdk/clients/cognitoidentityserviceprovider'; 4 | 5 | /** 6 | * AWS region in which your User Pools are deployed 7 | */ 8 | const OLD_USER_POOL_REGION = process.env.OLD_USER_POOL_REGION || process.env.AWS_REGION; 9 | 10 | /** 11 | * ID of the old User Pool from which you want to migrate users 12 | */ 13 | const OLD_USER_POOL_ID: string = process.env.OLD_USER_POOL_ID || ''; 14 | 15 | /** 16 | * Client ID in the old User Pool from which you want to migrate users. 17 | */ 18 | const OLD_CLIENT_ID: string = process.env.OLD_CLIENT_ID || ''; 19 | 20 | const OLD_ROLE_ARN: string | undefined = process.env.OLD_ROLE_ARN; 21 | const OLD_EXTERNAL_ID: string | undefined = process.env.OLD_EXTERNAL_ID; 22 | 23 | interface User { 24 | userAttributes: {[key: string]: string | undefined}; 25 | userName: string; 26 | } 27 | 28 | async function authenticateUser(cognitoISP: CognitoIdentityServiceProvider, username: string, password: string): Promise { 29 | console.log(`authenticateUser: user='${username}'`); 30 | 31 | try { 32 | const params: AdminInitiateAuthRequest = { 33 | AuthFlow: 'ADMIN_USER_PASSWORD_AUTH', 34 | AuthParameters: { 35 | PASSWORD: password, 36 | USERNAME: username, 37 | }, 38 | ClientId: OLD_CLIENT_ID, 39 | UserPoolId: OLD_USER_POOL_ID, 40 | }; 41 | const cognitoResponse = await cognitoISP.adminInitiateAuth(params).promise(); 42 | console.log(`authenticateUser: found ${JSON.stringify(cognitoResponse)}`); 43 | return lookupUser(cognitoISP, username); 44 | } catch (err) { 45 | console.log(`authenticateUser: error ${JSON.stringify(err)}`); 46 | return undefined; 47 | } 48 | } 49 | 50 | async function lookupUser(cognitoISP: CognitoIdentityServiceProvider, username: string): Promise { 51 | console.log(`lookupUser: user='${username}'`); 52 | 53 | try { 54 | const params = { 55 | UserPoolId: OLD_USER_POOL_ID, 56 | Username: username, 57 | }; 58 | const cognitoResponse = await cognitoISP.adminGetUser(params).promise(); 59 | console.log(`lookupUser: found ${JSON.stringify(cognitoResponse)}`); 60 | 61 | const userAttributes = cognitoResponse.UserAttributes ? cognitoResponse.UserAttributes.reduce((acc, entry) => ({ 62 | ...acc, 63 | [entry.Name]: entry.Value, 64 | }), {} as {[key: string]: string | undefined}) : {}; 65 | const user: User = { 66 | userAttributes, 67 | userName: cognitoResponse.Username, 68 | }; 69 | console.log(`lookupUser: response ${JSON.stringify(user)}`); 70 | return user; 71 | } catch (err) { 72 | console.log(`lookupUser: error ${JSON.stringify(err)}`); 73 | return undefined; 74 | } 75 | } 76 | 77 | async function onUserMigrationAuthentication(cognitoISP: CognitoIdentityServiceProvider, event: CognitoUserPoolTriggerEvent) { 78 | // authenticate the user with your existing user directory service 79 | const user = await authenticateUser(cognitoISP, event.userName!, event.request.password!); 80 | if (!user) { 81 | throw new Error('Bad credentials'); 82 | } 83 | 84 | event.response.userAttributes = { 85 | // old_username: user.userName, 86 | // 'custom:tenant': user.userAttributes['custom:tenant'], 87 | email: user.userAttributes.email!, 88 | email_verified: 'true', 89 | preferred_username: user.userAttributes.preferred_username!, 90 | }; 91 | event.response.finalUserStatus = 'CONFIRMED'; 92 | event.response.messageAction = 'SUPPRESS'; 93 | 94 | console.log(`Authentication - response: ${JSON.stringify(event.response)}`); 95 | return event; 96 | } 97 | 98 | async function onUserMigrationForgotPassword(cognitoISP: CognitoIdentityServiceProvider, event: CognitoUserPoolTriggerEvent) { 99 | // Lookup the user in your existing user directory service 100 | const user = await lookupUser(cognitoISP, event.userName!); 101 | if (!user) { 102 | throw new Error('Bad credentials'); 103 | } 104 | 105 | event.response.userAttributes = { 106 | // old_username: user.userName, 107 | // 'custom:tenant': user.userAttributes['custom:tenant'], 108 | email: user.userAttributes.email!, 109 | email_verified: 'true', 110 | preferred_username: user.userAttributes.preferred_username!, 111 | }; 112 | event.response.messageAction = 'SUPPRESS'; 113 | 114 | console.log(`Forgot password - response: ${JSON.stringify(event.response)}`); 115 | 116 | return event; 117 | } 118 | 119 | export const handler = async (event: CognitoUserPoolTriggerEvent, context: Context): Promise => { 120 | const options: CognitoIdentityServiceProvider.Types.ClientConfiguration = { 121 | region: OLD_USER_POOL_REGION, 122 | }; 123 | if (OLD_ROLE_ARN) { 124 | options.credentials = new ChainableTemporaryCredentials({ 125 | params: { 126 | ExternalId: OLD_EXTERNAL_ID, 127 | RoleArn: OLD_ROLE_ARN, 128 | RoleSessionName: context.awsRequestId, 129 | }, 130 | }); 131 | } 132 | const cognitoIdentityServiceProvider = new CognitoIdentityServiceProvider(options); 133 | 134 | switch (event.triggerSource) { 135 | case 'UserMigration_Authentication': 136 | return onUserMigrationAuthentication(cognitoIdentityServiceProvider, event); 137 | case 'UserMigration_ForgotPassword': 138 | return onUserMigrationForgotPassword(cognitoIdentityServiceProvider, event); 139 | default: 140 | throw new Error(`Bad triggerSource ${event.triggerSource}`); 141 | } 142 | } 143 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # migrate-cognito-user-pool-lambda 2 | 3 | See this [blog post](https://medium.com/collaborne-engineering/migrate-aws-cognito-user-pools-ff2a91a745a2?sk=f91b73b84396db6f41a294f54bfeb2db) for a description 4 | 5 | ## Usage 6 | 7 | Follow these steps to use the migration Lambda function: 8 | 9 | 1. Create a new user pool client in the old user pool 10 | This client must have the OAuth flow `ALLOW_ADMIN_USER_PASSWORD_AUTH` enabled. 11 | 12 | 2. Configure all clients in the new user pool that are allowed to trigger user migration 13 | These clients must use the OAuth flow `USER_PASSWORD_AUTH`. 14 | 15 | 3. Build the lambda source code 16 | 17 | ```bash 18 | npm install && npm run build 19 | ``` 20 | 21 | 4. Create in Lambda function in the AWS console in the same account as the new user pool 22 | 23 | * Configure the `OLD_USER_POOL_REGION`, `OLD_USER_POOL_ID`, and `OLD_CLIENT_ID` environment variables 24 | * Grant the required permissions for accessing the user pool 25 | 26 | If the old user pool is in the same AWS account: `Allow` the actions `cognito-idp:AdminGetUser` and `cognito-idp:AdminInitiateAuth` in the execution role of the lambda function 27 | 28 | If the old user pool is in a different AWS account: 29 | 30 | 1. Create a role in the account that owns the user pool that `Allow`s the `cognito-idp:AdminGetUser` and `cognito-idp:AdminInitiateAuth` actions and that trusts the execution role of the lambda function 31 | 2. `Allow` the action `sts:AssumeRole` for the ARN of the created role in the execution role of the lambda function 32 | 3. Configure the `OLD_ROLE_ARN` and `OLD_EXTERNAL_ID` environment variables for the lambda function 33 | 34 | 5. Configure the trigger _User Migration_ for the new User Pool to call the migration lambda function 35 | 36 | 37 | ## Using AWS CLI 38 | 39 | If you wish to use [AWS CLI](https://docs.aws.amazon.com/cli/latest/) 40 | This reduces the need to navigate around AWS Console which is always in flux and not the easiest to figure out. 41 | 42 | Maintain a txt list of the following variables as you work your way through this 43 | * `OLD_USER_POOL_ID` - the pool id you are migrating *from* (us-east-2_xyzABC) 44 | * `OLD_USER_POOL_ARN` - the pool Arn you are migrating *from* (arn:aws:cognito-idp:us-east-2:12345:userpool/us-east-2_xyzABC) 45 | * `OLD_USER_POOL_REGION` - the region that pool is located in (us-east-1 or us-east-2 etc...) 46 | * `NEW_USER_POOL_ID` - the pool you are migrating *to* (us-east-2_xyzDEF) 47 | * `ROLE_ARN` (created in step 1) 48 | * `POLICY_ARN` (created in step 2) 49 | * `OLD_CLIENT_ID` (created in step 4) 50 | * `LAMBDA_ARN` (created in step 5) 51 | 52 | 1. Create Role 53 | * Update the role name to match your DevOps procedures 54 | * Note the Arn returned from this as it will be your `ROLE_ARN` 55 | 56 | ```bash 57 | aws iam create-role --role-name cognito-migration-lambda-xxxx \ 58 | --assume-role-policy-document file://trust-policy.json 59 | ``` 60 | 61 | 2. Create Permissions for your lambda function to run 62 | * Update lambda-role-policy.json to the ARN of the *OLD* cognito user-pool (the one your migrating from) 63 | * "Resource": "arn:aws:cognito-idp:XXXXXXXXXXX" -> `OLD_USER_POOL_ARN` 64 | * Name your policy to match your DevOps procedures "cognito-migration-lambda-policy-xxxx" 65 | 66 | ```bash 67 | aws iam create-policy --policy-name cognito-migration-lambda-policy-xxxx \ 68 | --policy-document file://lambda-role-policy.json 69 | ``` 70 | This allows your lambda function to authenticate and look up users against the old cognito instance 71 | Note the Arn returned from the command `POLICY_ARN` 72 | 73 | 74 | 3. Attach Permissions to role 75 | * Update role names to match your DevOps procedures 76 | 77 | ```bash 78 | # Standard lambda execution policy, including cloud logging 79 | aws iam attach-role-policy --role-name cognito-migration-lambda-xxxxx \ 80 | --policy-arn arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole 81 | 82 | # Attach the policy you just created in step 2 83 | aws iam attach-role-policy --role-name cognito-migration-lambda-xxxxx \ 84 | --policy-arn POLICY_ARN 85 | ``` 86 | 87 | 4. Create user pool client in old user pool 88 | * Update user-pool-id with the ID of the *OLD* user pool 89 | * This is the client that the lambda function will connect to validate user / passwords with 90 | * Note the ClientId returned from this as it will be your `OLD_CLIENT_ID` 91 | 92 | ```bash 93 | aws cognito-idp create-user-pool-client \ 94 | --user-pool-id XXXXXXXX \ 95 | --client-name lambda-migration-client \ 96 | --no-generate-secret \ 97 | --explicit-auth-flows "ALLOW_USER_PASSWORD_AUTH" "ALLOW_ADMIN_USER_PASSWORD_AUTH"" 98 | ``` 99 | 100 | 5. Create lambda function 101 | * Edit lambda-skeleton.json 102 | * Update 103 | * "FunctionName": "test-migration-cognitio" 104 | * "Role": "`ROLE_ARN`" 105 | * "OLD_CLIENT_ID": "XXX", 106 | * "OLD_USER_POOL_ID": "XXX", 107 | * "OLD_USER_POOL_REGION": "XXX" 108 | * Build the function code 109 | ```bash 110 | npm install && npm run build 111 | ``` 112 | * Deploy it 113 | * Note the Arn returned from this, this is your `LAMBDA_ARN` 114 | ```bash 115 | aws lambda create-function --cli-input-json file://lambda-skeleton.json 116 | ``` 117 | 118 | 6. Attach lambda to new user pool 119 | * This is where you hook up your lambda function to your new cognito instance 120 | * Update the `NEW_USER_POOL_ID` and `LAMBDA_ARN` 121 | 122 | ```bash 123 | aws cognito-idp update-user-pool \ 124 | --user-pool-id NEW_USER_POOL_ID \ 125 | --lambda-config UserMigration=LAMBDA_ARN 126 | ``` 127 | 128 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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