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Knowing who you are is not the same as knowing what you can do. This is where the two things come into play.

It's important that you understand what authorization is before you talk about OpenID Connect.

Affirmative identity is the process of checking that a person is who they say they are.

Normally, the user uses something she knows to prove her identity, such as a usernames and passwords.

Authorization is the process of verification of what a user can do. A user can add songs to a shared playlist, but can't remove them. After a user is verified, authorization occurs.

I think it's important that you know what we used before it, so that you understand the need for it. The most common ways toauthenticate and manage authorization were using cookies and through theAPI Keys.

There are more options, but they are the most common.

Share your password and usernames.

Sharing the password and usernames with the service that needs to act on your behalf has been the way to go for a while now. The problem in this scenario is that we are acting as the end user, which is called impersonation. We can't restrict access to certain parts of the application that is acting for us because we can't delegate only certain permissions.

Imagine if every application that wants to do something with your Facebook profile posted on your wall and got your friends list. If we used this system, we would give him access to everything, and he could recover private conversations, our photos, follow people we don't want, and remove friends that we do want.

There are cookies.

The system will give us a cookie if theAuthentication has been successful. This will allow access to the resource.

Cross-site request forgery is the main problem with these. If the user opens a new tab in the browser, they will be able to access the same site. We are giving access to the entire browser, not just the tab where the web application that consults our information is located. An attacker could inject code into our service and carry out tasks on our behalf without our consent.

There are API Keys.

We can see this option a lot today. We use a key to access resources. The keys can be prevented from working indefinitely if they have an expired time.

The problem with the Keys is that they usually give you full access to all the operations the API can perform. Users are not allowed to be identified, and theAPI Keys do not identify projects. There is no standard for how these keys should be made.

I remember a few years ago when I had to see OAuth 1.0 for the first time and it was with the integration of a SharePoint and Twitter 🙂 At that time, it had just been announced that some of the big companies in the market had enabled OAuth 1.0 in their APIs with in order to avoid sending the username and password in each request, in addition to being able to manage a finer access to the actions provided by the APIs.

OAuth was built to access the internet.

The user can perform certain actions on the application's behalf. It is important to point out that the framework for authorization is called OAuth. The 888-405-7720 888-405-7720

The way in which these 4 parts are related is similar to this.

Let's take a look at some of the details of the flow now that you have the big picture down.

There is consent.

In step 2, I said that the user must consent to what the application is asking of him. You have seen it many times.

You need to make sure that the user knows what their permission for is for and what they can do with it.

The endpoints.

Endpoints and URLs are in our authorization server for step 2 and step 4.

The client application must know the URLs for both.

The scope.

Permissions to do something within a protected resource are called scopes. The scope is not the same in different sites. They should be clearly defined. Since it clearly shows that this is only read access to a specificAPI, make it a returngis_api.read scope.

There are different types of clients.

Two types of clients are recognized by OAuth 2.0.

Depending on the type of client we have, we will try to obtain an access token.

There are different ways to get an access token

There are different ways to get an access token. Depending on the type of client application you have, you should use one or the other of the Flows ways.

Authorization Code Flow.

This is the flow that I have shown you, and it is the most complete, and therefore the most secure.

It's used with applications that can store a password. The secret cannot be accessed through the client. This secret cannot be saved in an application that the user can navigate through and find. This scenario can be applied to websites that have a secure back end.

When the flow starts, this is what happens when you go into more detail.

The user is first directed to the authorization endpoint, which the client application knows about.

These are the mandatory parameters that this type of authorization needs.

The authorization server will respond when the user has been successfully validation.

Code has a short lifetime. We have a state that should be the same as the one we sent in the first request.

The application will use this code to make a call to the authorization server.

You can either use basic authentication or put the client secret in the body. The secret I was talking about is obtained during the registration of the application in the authorization server.

We will receive a response if everything goes well.

This is a complete example of how to carry out this flow.

Implicit flow.

If the application cannot keep the secret, what happens?

It is usually in cases where the user can see the client's secret.

This type is designed for public clients who can't keep their secrets.

A public client is an application that uses the AngularJS framework to communicate with a protected resource. This flow was specifically for Javascript applications.

The previous type was more secure. In this case, the client directly receives the token and there is no code for it.

The call is similar to this.

When registered applications request token, redirecting_uri is our best defense.

The response will be like this if all goes well.

The access_token is exposed to the end user, unlike the previous case. Any Javascript on the client could access this information. It is also possible that a malicious app injected another user's token and you started sending personal information to the wrong user.

This is an example of how to test this.

Client credentials flow.

If there is no user who owns the resources, what happens? Can we still protect our APIs with OAuth if the app has no users? The answer is yes, and it is through this guy.

It is intended that the client application is the owner of the resource and there are no users involved in the operation. It's machine-to-machine communication.

The request is as follows:

We received the following information.

Resource owner password credentials flow.

It is intended for legacy applications so that they can use the architecture provided by OAuth 2.0. It should be a temporary solution to allow time for the application to be changed.

We can get the token directly by sending the usernames and passwords. This type is not used in modern applications.

The token request would be as follows:

The answer would be the same.

The same weaknesses as sharing the password directly with the protected resource are present in this type.

You can see an example of how it works in this article.

The device code flows.

New needs have arisen over the years, so this last type is an extension to OAuth 2.0 The authorization server on the thermostat in my house, my YouTube account on TV, and other devices that do not have a browser, can be accessed by the user if they have a device that does not have a browser.

The following is the flow that followed this case.

The device call to the authorization server has a different endpoint.

The server will give a URL where the user must go to get the token, and a code that must be entered to get it.

You have an example of how it works in this article.

You already have a token, now what?

You can use your access token to make requests to the protected resource. Normally like this.

What happens when the token expires?

The token returned by the server has an expiration time, we have seen it in all the examples. This may not be possible since there are times when the user doesn't expect to have to access the application every time he wants to. This is where the refresh token comes into play. When the authorization server gives us the access token, it will also give us another one that will allow us to renew it when it expires.

It isn't supported by all of the types we have seen, so if you have a refresh token in your possession, you will be able to get access. Passwords are typically used with confidential clients.

Offline_access must be added as a scope to request this type of token.

The following request is required to request a new access token. This is done either when the time expires or when the server returns a 401 because the access token we have has expired.

The refresh token should not be exposed to the browser. The answer would be like this: