Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
Create a Cognito Authentication Backend via CloudFormation
AWSTemplateFormatVersion: '2010-09-09'
Description: Cognito Stack
Parameters:
AuthName:
Type: String
Description: Unique Auth Name for Cognito Resources
Resources:
# Creates a role that allows Cognito to send SNS messages
SNSRole:
Type: "AWS::IAM::Role"
Properties:
AssumeRolePolicyDocument:
Version: "2012-10-17"
Statement:
- Effect: "Allow"
Principal:
Service:
- "cognito-idp.amazonaws.com"
Action:
- "sts:AssumeRole"
Policies:
- PolicyName: "CognitoSNSPolicy"
PolicyDocument:
Version: "2012-10-17"
Statement:
- Effect: "Allow"
Action: "sns:publish"
Resource: "*"
# Creates a user pool in cognito for your app to auth against
# This example requires MFA and validates the phone number to use as MFA
# Other fields can be added to the schema
UserPool:
Type: "AWS::Cognito::UserPool"
Properties:
UserPoolName: !Sub ${AuthName}-user-pool
AutoVerifiedAttributes:
- phone_number
MfaConfiguration: "ON"
SmsConfiguration:
ExternalId: !Sub ${AuthName}-external
SnsCallerArn: !GetAtt SNSRole.Arn
Schema:
- Name: name
AttributeDataType: String
Mutable: true
Required: true
- Name: email
AttributeDataType: String
Mutable: false
Required: true
- Name: phone_number
AttributeDataType: String
Mutable: false
Required: true
- Name: slackId
AttributeDataType: String
Mutable: true
# Creates a User Pool Client to be used by the identity pool
UserPoolClient:
Type: "AWS::Cognito::UserPoolClient"
Properties:
ClientName: !Sub ${AuthName}-client
GenerateSecret: false
UserPoolId: !Ref UserPool
# Creates a federeated Identity pool
IdentityPool:
Type: "AWS::Cognito::IdentityPool"
Properties:
IdentityPoolName: !Sub ${AuthName}Identity
AllowUnauthenticatedIdentities: true
CognitoIdentityProviders:
- ClientId: !Ref UserPoolClient
ProviderName: !GetAtt UserPool.ProviderName
# Create a role for unauthorized acces to AWS resources. Very limited access. Only allows users in the previously created Identity Pool
CognitoUnAuthorizedRole:
Type: "AWS::IAM::Role"
Properties:
AssumeRolePolicyDocument:
Version: "2012-10-17"
Statement:
- Effect: "Allow"
Principal:
Federated: "cognito-identity.amazonaws.com"
Action:
- "sts:AssumeRoleWithWebIdentity"
Condition:
StringEquals:
"cognito-identity.amazonaws.com:aud": !Ref IdentityPool
"ForAnyValue:StringLike":
"cognito-identity.amazonaws.com:amr": unauthenticated
Policies:
- PolicyName: "CognitoUnauthorizedPolicy"
PolicyDocument:
Version: "2012-10-17"
Statement:
- Effect: "Allow"
Action:
- "mobileanalytics:PutEvents"
- "cognito-sync:*"
Resource: "*"
# Create a role for authorized acces to AWS resources. Control what your user can access. This example only allows Lambda invokation
# Only allows users in the previously created Identity Pool
CognitoAuthorizedRole:
Type: "AWS::IAM::Role"
Properties:
AssumeRolePolicyDocument:
Version: "2012-10-17"
Statement:
- Effect: "Allow"
Principal:
Federated: "cognito-identity.amazonaws.com"
Action:
- "sts:AssumeRoleWithWebIdentity"
Condition:
StringEquals:
"cognito-identity.amazonaws.com:aud": !Ref IdentityPool
"ForAnyValue:StringLike":
"cognito-identity.amazonaws.com:amr": authenticated
Policies:
- PolicyName: "CognitoAuthorizedPolicy"
PolicyDocument:
Version: "2012-10-17"
Statement:
- Effect: "Allow"
Action:
- "mobileanalytics:PutEvents"
- "cognito-sync:*"
- "cognito-identity:*"
Resource: "*"
- Effect: "Allow"
Action:
- "lambda:InvokeFunction"
Resource: "*"
# Assigns the roles to the Identity Pool
IdentityPoolRoleMapping:
Type: "AWS::Cognito::IdentityPoolRoleAttachment"
Properties:
IdentityPoolId: !Ref IdentityPool
Roles:
authenticated: !GetAtt CognitoAuthorizedRole.Arn
unauthenticated: !GetAtt CognitoUnAuthorizedRole.Arn
Outputs:
UserPoolId:
Value: !Ref UserPool
Export:
Name: "UserPool::Id"
UserPoolClientId:
Value: !Ref UserPoolClient
Export:
Name: "UserPoolClient::Id"
IdentityPoolId:
Value: !Ref IdentityPool
Export:
Name: "IdentityPool::Id"
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.