When all users authenticate at the IdP, you can easily add functionality, such as federation to other identity sources or security measures like multi-factor authentication.Because an IdP is the place where authorization and authentication decisions are performed, it becomes a single central location for analyzing, enabling, and disabling access to systems.Just as a database is focused on retaining data with certain guarantees, an IdP can focus on login functionality and provide a well understood interface.One system holding user PII can be locked down and protected more easily than many systems.Using such a centralized service has a number of advantages: This token is presented to other applications, APIs, and services. Users sign in to the IdP and are granted time-bound permissions in the form of an access token. When you are using OAuth, you outsource user authentication and authorization to a central identity provider (IdP). When you are done with this article, you’ll know more about why you might choose OAuth, when to use it, and some alternatives. This is a related use case, but different enough that it doesn’t make sense to cover it. How to use OAuth to access a third party API such as Google.All the edge cases OAuth and related standards can address.Every single OAuth related specification.Some of the topics that will be omitted include: While I’ll dive further into how you actually use OAuth to protect an API in your system below, including code examples, I won’t cover certain topics in this article. But if you need specialized functionality, even if it is part of a standard, carefully review the documentation of any solution you are considering. If you need core functionality, you should be covered by almost any OAuth server. If you have a typical auth use case, the OAuth standard almost certainly will work for you. The members of the group also work to support weird edge cases in scale, user interfaces, and network connectivity. As a user of this standard, you gain all their hard work without having to hire them! This work includes security analysis, where the group constantly considers different attack vectors and weaknesses in the protocol and ameliorates them. OAuth2 (the version of OAuth that this article will cover) has been around since 2012 as a standard and is built on lessons from other, earlier standards, including OAuth1 and SAML.īeing a standard, OAuth benefits from many smart people working together in the open. It allows users to securely delegate access to resources without sharing their original credentials. OAuth is one of many solutions you can use to protect your APIs and other resources. APIs are necessary to proper functioning of such applications, but if you don’t protect them, bad actors can exfiltrate data, DDoS your servers, or otherwise abuse them. Many apps today are actually a front-end for a series of API calls.
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