iRealtee OS Glossary

OAuth 2.0

OAuth 2.0 replaces the original OAuth 1.0 protocol with a simpler, more flexible design. The framework focuses on client developer simplicity while supporting s...

OAuth 2.0

OAuth 2.0 is an authorization framework that enables third-party applications to obtain limited access to user accounts on HTTP services without exposing user credentials. Defined in RFC 6749 by the Internet Engineering Task Force (IETF), it separates authentication from authorization to provide secure, delegated access.

OAuth 2.0 replaces the original OAuth 1.0 protocol with a simpler, more flexible design. The framework focuses on client developer simplicity while supporting specific authorization flows for web applications, desktop applications, mobile devices, and server-to-server communication.

Key Components

  • Resource Owner: The user who authorizes access to their protected resources
  • Client: The application requesting access to protected resources
  • Authorization Server: Issues access tokens after authenticating the resource owner
  • Resource Server: Hosts protected resources and accepts access tokens
  • Access Token: Credential used to access protected resources
  • Refresh Token: Credential used to obtain new access tokens without re-authorization
  • Scopes: Define the specific permissions granted to the client

How it Works

OAuth 2.0 uses a grant-based authorization model. You start by registering your application with the authorization server to receive client credentials.

When a user wants to connect their account, your application redirects them to the authorization server. The user authenticates and approves the requested permissions (scopes).

The authorization server then redirects back to your application with an authorization code. Your application exchanges this code for an access token.

You can now use the access token to make API requests on behalf of the user. When the token expires, use the refresh token to obtain a new access token without requiring user interaction.

Authorization Grant Types

OAuth 2.0 defines four grant types for different scenarios:

  • Authorization Code: Most secure; used by server-side applications
  • Implicit: Simplified flow for browser-based apps (deprecated in OAuth 2.1)
  • Resource Owner Password Credentials: Direct username/password exchange for trusted clients
  • Client Credentials: Server-to-server authentication without user context

Pros & Cons

Advantages:

  • Eliminates password sharing between services
  • Granular permission control through scopes
  • Token-based access simplifies revocation
  • Industry-wide adoption ensures broad compatibility

Disadvantages:

  • Complex implementation requires careful security consideration
  • Multiple grant types can cause confusion
  • Token management adds system complexity
  • Vulnerable to misconfiguration attacks

Real-World Application

In Philippine real estate platforms, OAuth 2.0 powers social login features that let users sign in using their existing Google, Facebook, or Apple accounts. This eliminates the need to create and remember separate credentials for property portals.

For real estate brokerages, OAuth 2.0 enables secure integration with third-party services. Your CRM system can connect to marketing platforms, payment gateways, and developer APIs without storing sensitive credentials.

The single sign-on capability is valuable for real estate networks where agents need access to multiple systems—property listings, commission tracking, and learning management—through one authenticated session.

References

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