Rest api nonce

congratulate, very good idea suggest..

Rest api nonce

Hi ivrrimum. Note that I added a wtfaid parameter to the Ajax request data to trigger the nonce verification only when I want it and not on every single API request :. A reasonable concern, but when handled properly it will be fine. The key is to pass on whatever your callback received unless the request applies to your specific app and your callback received null as the passed parameter.

If anything else besides null is returned, it will be treated as the final authentication determination. It assumes it is the final auth arbitrator, anything later will never be passed null. Always keep in mind your callback here is a complete auth check, not merely a custom nonce action check.

Failure to do so introduces a security vulnerability. Skip to content WordPress. Skip to content. Viewing 3 replies - 1 through 3 of 3 total. Charlie Merland caercam 2 years, 12 months ago.

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Anyway, hope that helped you somehow! This reply was modified 2 years, 12 months ago by Charlie Merland. Moderator bcworkz bcworkz 2 years, 12 months ago. Charlie Merland caercam 2 years, 11 months ago.One of the most common headers is call Authorization. Wait a minute, we are talking about authentication but why the Authorization header? The distinction between authentication and authorization is important in understanding how RESTful APIs are working and why connection attempts are either accepted or denied:.

Authentication is the verification of the credentials of the connection attempt. This process consists of sending the credentials from the remote access client to the remote access server in an either plaintext or encrypted form by using an authentication protocol. Authorization is the verification that the connection attempt is allowed. Authorization occurs after successful authentication.

rest api nonce

In other words: Authentication is stating that you are who are you are and Authorization is asking if you have access to a certain resource. I know that it is a bit confusing that in REST APIs we are using the Authorization header for doing Authentication or both but if we remember that when calling an API we are requesting an access to certain resource it means that the server should know whether it should give access to that resource or not, hence when developing and designing RESTful API Authorization header sounds just fine.

The most simple way to deal with authentication is to use HTTP basic authentication. We use a special HTTP header where we add 'username:password' encoded in base Note that even though your credentials are encoded, they are not encrypted!

It is very easy to retrieve the username and password from a basic authentication. One of the downsides of basic authentication is that we need to send over the password on every request. Also, it does not safeguard against tampering of headers or body. Another way is to use HMAC hash based message authentication.

Instead of having passwords that need to be sent over, we actually send a hashed version of the password, together with more information. Let's assume we have the following credentials: username "username", password "secret". We could add other information as well, like the current timestamp, a random number, or the md5 of the message body in order to prevent tampering of the body, or prevent replay attacks.

Next, we generate a hmac:. Right now, the server knows the user "username" tries to access the resource.

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The server can generate the digest as well, since it has all information. Please note that the "password" is not encrypted on the server, as the server needs to know the actual value. This is why te name "secret" is preffered and not a "password".By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

It only takes a minute to sign up. For a single page application, you should probably use OAuth. However, using Backbone is out of the question, and so are themes, so I wrote the following plugin:.

The expected result is two new posts, but I get Cookie nonce is invalid from the first one, and the second one creates the post succesfully. That's probably because the nonces are different, but why? I'm logged in as the same user in both requests.

I tried messing with globals without much luck. As you can see, when the verify endpoint is called, uid is 0. So this function nullifies your authentication, with this code:.

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That's why you're getting a different nonce from your REST call vs getting it from the theme. The REST call is intentionally not recognizing your login credentials in this case via cookie auth because you didn't send a valid nonce in the get request.

The verify fails because the rest code nullifies your login before the verify takes place. While this solution works, it isn't recommended. OAuth is the preferred choice. Using this filter I was able to write the following, and the JavaScript code executes like it should:. If you spot a security problem with the fix, please give me a shout, right now I can't see anything wrong with it, other than globals. Looking at all this code it seems like your problem is the use of closures.

At init stage you should only set hooks and not evaluate data as not all of the core had finished loading and being initialized. A better code will be.

As always with anything hook in wordpress, use the latest hook possible and never try to precalculate anything you don't have to.

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Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 2 years, 1 month ago. Active 2 years, 1 month ago. Viewed 5k times. If my approach is wrong, how should I get the nonce? Edit : I tried messing with globals without much luck.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. In digest based authentication, nonce is generated by server. However in OAuth based authentication, nonce is generated by client. I want to know if anyone knows the reason for the difference? Nonces are used to make a request unique.

In an authentication scheme without a nonce, a malicious client could generate a request ONCE and replay it MANY times, even if the computation is expensive. If the authentication schema requires the client to perform expensive computation for every single request, as the request is made unique by using a nonce, the replay attack is folded, as its speed just went from O 1 to O N. The reason to have a client nonce is to prevent malicious clients do replay attacks. The reason to have a server nonce is to prevent a Man-in-the-Middle attacks, in case an attacker captures a valid server response, and tries to replay it to a client.

Advanced JAX-RS 22 - REST API Authentication Mechanisms

Firstly, sometimes clients do provide a nonce in digest auth, but mainly it relies on the server see RFC Secondly, because if you think of the authentication procedure in terms of a handshake, then with Oauth when you already have a token you've been through half of the handshake, you've already spoken with the server, so your next move is to contact the server with your service request.

This needs to be protected by a nonce too, so you provide it. Or, the converse. I already have the token, so why would I contact the server to get a nonce so that I could then contact the server again with my service request? I might make a service requests, by producing my own nonces it cuts down on bits of network traffic that were unneeded.

rest api nonce

Learn more. Asked 9 years, 1 month ago. Active 2 years, 6 months ago. Viewed 27k times. Active Oldest Votes. Mike Chamberlain Marcin Marcin 2, 1 1 gold badge 19 19 silver badges 15 15 bronze badges. I don't understand.

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What prevents a malicious client to send many times a nonce he has generated once? Is a request supposed to be turned down when the server receives a nonce already used?

Nothing, malicious clients can do that no problem. That's not the scenario that nonces protect. They protect non-malicious users from having their login replayed by a malicious snooper. Firstly, sometimes clients do provide a nonce in digest auth, but mainly it relies on the server see RFC Secondly, because if you think of the authentication procedure in terms of a handshake, then with Oauth when you already have a token you've been through half of the handshake, you've already spoken with the server, so your next move is to contact the server with your service request.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

It only takes a minute to sign up. As the fetch request is fired, I see it go into an auth handler function. The nonce value shows as a string and appears to be a matching nonce value but it fails:. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 7 months ago. Active 7 months ago. Viewed times.

rest api nonce

Does anyone know why the verification is returning false here? Sean Dezoysa. Sean Dezoysa Sean Dezoysa 1 1 silver badge 8 8 bronze badges.

How are you sending the nonce? RoelMagdaleno I send it in the post body of a fetch request. I have updated the original post to show the request handler. I capture it with a rest route handler using the callback shown. Active Oldest Votes. Because we're sending a JSON payload. Are you seeing the same long-length nonce?? Sign up or log in Sign up using Google. Sign up using Facebook.

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While there are as many proprietary authentication methods as there are systems that utilize them, they are largely variations of a few major approaches. As much as authentication drives the modern internet, the topic is often conflated with a closely related term: authorization. The two functions are often tied together in single solutions, but the easiest way to divide authorization and authentication is to ask: what do they actually state or prove about me?

Authentication is when an entity proves an identity. In other words, Authentication proves that you are who you say you are. This is like having a driver's license that is given by a trusted authority that the requester, such as a police officer, can use as evidence that suggests you are in fact who you say you are.

Authorization is an entirely different concept and in simple terms, Authorization is when an entity proves a right to access. In other words, Authorization proves you have the right to make a request. Consider the following — You have a working key card that allows you to open only some doors in the work area, but not all of them.

Authentication refers to proving the correct identity. Authorization refers to allowing a certain action. This is the most straightforward method and easiest method. With this method, the sender places a username: password into the request header. The username and password are encoded with Base64, which is an encoding technique that converts the username and password into a set of 64 characters to ensure safe transmission.

This method does not require cookies, session IDs, login pages, and other specialty solutions. Bearer authentication also called token authentication is an HTTP authentication scheme that involves security tokens called bearer tokens. The Bearer authentication scheme was originally created as part of OAuth 2. However, this method should not be considered a good security measure. In this method, a unique generated value is assigned to each first time user, signifying that the user is known.

When the user attempts to re-enter the system, their unique key sometimes generated from their hardware combination and IP data and other times randomly generated by the server which knows them is used to prove that they are the same user as before.

Many API keys are sent in the query string as part of the URL, which makes it easier to discover for someone who should not have access to it. Please do not put any API keys or sensitive information in query string parameters! A better option is to put the API key in the Authorization header. There are definitely some valid reasons for using API Keys. First and foremost, API Keys are simple.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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Cookie authentication is the basic authentication method included with WordPress. When you log in to your dashboard, this sets up the cookies correctly for you, so plugin and theme developers need only to have a logged-in user. This prevents other sites from forcing you to perform actions without explicitly intending to do so. This requires slightly special handling for the API. For developers using the built-in Javascript API, this is handled automatically for you.

This is the recommended way to use the API for plugins and themes. Custom data models can extend wp. Base to ensure this is sent correctly for any custom requests. For developers making manual Ajax requests, the nonce will need to be passed with each request.

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So most likely you forgot about the nonce part when testing your custom endpoint. Then you pass the token each request settings the request header Authorization like:. Now you can run any wordpress default api from mobile app or any other source or by postman.

By app or by postman, When you will login with valid details using rest api you will get back a token. By this way you will get a token as shown in picture Now use this token to get logged in user details, for example 5.

WP_REST_API Nonce not working.

Now again run this new url in postman or in app to get logged in user details. This could be due to a server configuration perhaps as this was on a shared hosting environment.

I did not find any posts or comments mentioning this before, but this is what happened in my case. Learn more. How to get current logged in user using Wordpress Rest Api? Ask Question. Asked 3 years, 1 month ago. Active 8 months ago. Viewed 17k times. I tried to add a custom request. But the user is logged in for sure. Semyon Tikhonenko. Semyon Tikhonenko Semyon Tikhonenko 2, 2 2 gold badges 23 23 silver badges 44 44 bronze badges.

Did you get this working? Are you able to post the solution? Did you fix it? Active Oldest Votes. Hope it helps! I tried your solution and I updated my post. Can you please help? The nonce must come with the client's request, not be generated in the rest-server's response.


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