Security

The Old Faithful: Why SSM Parameter Store still reigns over Secrets Manager

AWS, Security, Serverless / September 16, 2023

Managing and securing application secrets is a crucial part of any cloud-native application. AWS offers two primary services: the Systems Manager (SSM) Parameter Store and the more recent Secrets Manager. You might think Secrets Manager is the better choice for managing secrets because it’s a newer service and offers more advanced features such as cross-region …

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Implementing Magic Links with Amazon Cognito: A Step-by-Step Guide

AWS, Cognito, Lambda, Security, Serverless / March 22, 2023

Last week, we looked at implementing passwordless authentication using one-time passwords (OTPs) using Cognito. Another popular passwordless authentication method is magic links where: The user initiates the sign-in process by entering their email in your application. They receive an email with a time-limited URL. The user clicks on the URL and is authenticated into the …

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Passwordless Authentication made easy with Cognito: a step-by-step guide

AWS, Cognito, Security, Serverless / March 13, 2023

Password-based authentication has long been the norm for securing user accounts. However, it is becoming increasingly clear that password-based authentication has several drawbacks. Such as the risk of password theft, the need for users to remember complex passwords, and the time and effort required to reset forgotten passwords. Fortunately, more and more websites have started …

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Yes, S3 now encrypts objects by default, but your job is not done yet

AWS, S3, Security / April 6, 2023

Update 06/04/2023: AWS announced that S3 now enables the “block public access” and “disable ACL” settings for all new buckets. It’s great to see these being enabled by default. But the points I raised in the post still stand. The default encryption (SSE-S3) only protects against situations when someone has stolen data from AWS servers/disks …

Yes, S3 now encrypts objects by default, but your job is not done yet Read More »

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How to setup geofencing and IP allow-list for Cognito user pool

AWS, Cognito, Security, WAF / April 6, 2023

AWS announced a new feature this week that lets you enable WAF protection for Cognito user pools. And one of the things you can do with this is to implement geo-fencing and IP allow/deny lists. Geo-fencing and IP allow/deny lists are usually implemented in the frontend as well as the backend APIs. But users (and …

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Group-based auth with AppSync Lambda authoriser

AppSync, AWS, Programming, Security, Serverless / September 16, 2023

AWS AppSync added support for Lambda authorizers on 30th July 2021 and it made it much easier to implement group-based authorization with 3rd party identity services. Group-based auth with AppSync and Cognito I previously wrote about how you can secure multi-tenant applications with AppSync and Cognito. Where you can use custom attributes to capture the tenant …

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How to choose the right API Gateway auth method

API Gateway, AWS, Programming, Security, Serverless / September 16, 2023

Update 21/06/2020: following lots of feedback and questions on Twitter, I have updated the post to include a few more options. Quite a few clients have asked me “Hey Yan, what API Gateway auth method should I use for this REST API?” so I thought I’d share my answer with everyone here. This is the …

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The API Gateway security risk you need to pay attention to

API Gateway, AWS, Lambda, Programming, Security, Serverless / November 25, 2019

When you deploy an API to API Gateway, throttling is enabled by default in the stage configurations. By default, every method inherits its throttling settings from the stage. Having built-in throttling enabled by default is great. However, the default method limits – 10k req/s with a burst of 5000 concurrent requests – matches your account …

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Many-faced threats to Serverless security

3 Comments / AWS, Lambda, Programming, Security, Serverless / October 6, 2019

Threats to the security of our serverless applications take many forms, some are the same old foes we have faced before; some are new; and some have taken on new forms in the serverless world. As we adopt the serverless paradigm for building cloud-hosted applications, we delegate even more of the operational responsibilities to our …

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