OAuth is an open standard for authorizing access to data. It is a service that is complementary to, but distinct from, OpenID.

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41
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9answers
3k views

Isn't OAuth, OpenID, Facebook Connect, and others crazy from a security standpoint?

I work with APIs all the time and I work with web developers who insist that OAuth, OpenID, etc are far superior than a home-brew method. Every site seems to be using these as well now for ease of use ...
39
votes
5answers
7k views

What are the downsides of BrowserID/Persona compared to OpenID/OAuth/Facebook?

Mozilla went live with a new service called BrowserID/Persona (announcement, background). It is intended to replace current single-sign-on solutions such as OpenID, OAuth and Facebook. One advantage ...
35
votes
6answers
6k views

Can someone explain the “Covert Redirect” vulnerability in OAuth and OpenID?

CNet is reporting that all OpenID and OAuth sites are vulnerable to an attack called "Covert Redirect". What is this attack, how does it work, and as an end user, how can I mitigate the risk?
16
votes
4answers
5k views

Why use OpenID Connect instead of plain OAuth?

I just started to use OAuth 2.0 as a way to authenticate my users. It works great - I just use the identity/profile API of each provider to get a validated email address of the user. Now I read about ...
16
votes
2answers
1k views

Essential things to think about before outsourcing authentication with OpenID, OAuth, or SAML

It's clear there there is no consistent set of features among any of the popular authentication providers. Below is an attempt to aggregate the similarities and differences I've noticed, but I ...
12
votes
2answers
6k views

Difference Between OAUTH, OpenID and OPENID Connect in very simple term?

I am very confused the difficult jargon available in web about OAUTH, OpenID and OPENID Connect. Can anyone tell me the difference in simple words.
12
votes
2answers
6k views

Facebook API : App Secret - possible misuse

I've recently find out that by simple quick look into compiled code of one of our applications, you can get both App ID (API Key) and App Secret for Facebook API I suppose that we should really keep ...
11
votes
2answers
2k views

What are the dangers of allowing “less secure apps” to access my Google account?

According to https://support.google.com/accounts/answer/6010255: Google may block sign in attempts from some apps or devices that do not use modern security standards. Since these apps and devices ...
11
votes
1answer
2k views

Best way to secure javascript front end/REST back end architecture web site?

I would like to build the following project: public REST API back end which can be accessed by any authenticated client. front end with static files in HTML/CSS/Javascript with Backbone.js jQuery ...
10
votes
2answers
256 views

Preventing Voter Fraud on a Social Media Contest

I'm creating a contest that will allow users to login using their Facebook & Twitter accounts and submit votes on videos. My clients concern is that users will game the system by logging into ...
9
votes
4answers
2k views

Is Facebook Connect or Twitter OAuth PCI Compliant?

We have a system that stores credit cards securely on file. We'd love to allow users to sign up using Facebook Connect or Twitter. Obviously this wouldn't be secure if we were trusting just any old ...
9
votes
1answer
590 views

Is logging in using OAuth/OpenID also vulnerable to heartbleed?

If one has logged into a "heartbleed-vulnerable" site using OpenID, for example, using Google to log into StackExchange, does that mean that the Google password is now at risk as well?
9
votes
2answers
8k views

OAuth access token vs session key

Is there any advantage to OAuth vs cookie-based sessions (established via username/password) under the following assumptions? There is only one legitimate client to the service The OAuth client ...
9
votes
2answers
4k views

OAuth2 Cross Site Request Forgery, and state parameter

http://tools.ietf.org/html/draft-ietf-oauth-v2-30#section-10.12 says: The client MUST implement CSRF protection [...] typically accomplished by requiring any request sent to the redirection URI ...
7
votes
2answers
2k views

What is the benefit of the scope in OAuth2?

In the question, substitute scope with state. Since there is an answer based on the wrong question, I'll let everything below as is. The answer is useful nonetheless. This question refers to ...
7
votes
1answer
166 views

Is it possible to implement a nonce without storage?

I am looking at implementing an authentication module using OAuth 2.0 Client and I am trying to avoid having any server state. I was going thorough a few other questions when to use nonce? Is it ...
7
votes
1answer
99 views

What are the implications of publicizing a consumer secret for sharing between developers doing local website development?

In relation to this GitHub issue on the Gittip project (which turned out to be a false alarm), what are the security implications, if any, of hardcoding into the git repo a test app's OAuth consumer ...
7
votes
2answers
300 views

How does an attacker abuse Facebook Connect with a leaked secret key?

I am reading about Facebook Connect and it looks a lot like OpenID Connect. Are these two similar enough that the Facebook Connect secret key is an OAuth Client Secret and therefore the same attacks ...
7
votes
1answer
2k views

Storing OAuth and other authentication tokens

We all know that when to store passwords, we should store it with one-way hash such as a variant of SHA, bcrypt or scrypt to prevent plain-text password leaks when the database is hacked. But what ...
6
votes
4answers
1k views

Is 'Bring your own Identity' as the only authentication option a valid practice?

This question is mainly aimed at OpenID Connect, when it is fully realized. I understand the aversion to signing in with a social networking site, but from what I understand about OIDC, its supposed ...
6
votes
3answers
209 views

Detecting OAuth malicious Implementation

I am wondering how can an end-user detect a maliciously implemented OAuth whether 2-legged or 3-legged. Particularly I am interested in those cases where the consumer requester is maliciously ...
6
votes
2answers
584 views

Should I avoid this token-based authentication scheme (that's not OAuth)?

I've dealt with OAuth before but I'm not too sure about the API I'm working with now. My question is basically, is this woefully insecure? As I understand it, oAuth does the following (roughly): ...
6
votes
2answers
483 views

Client authentication vs. user authentication

I am currently looking into authentication protocols which work well with REST API, in java. There is something fundamental I don't understand: I read a lot of material about OAuth protocol, SSL, ...
6
votes
2answers
3k views

What is the purpose of OAuth 2.0 redirect_uri checking?

The OAuth 2.0 specification's authorization code mechanism includes redirect URI checking from the site you redirect to. See steps D and E in section 4.1 of the spec. Also, section 4.1.3 describes in ...
6
votes
2answers
2k views

Security drawbacks for using short-lived access token in javascript client side

I intend to build a front end site entirely in javascript (NodeJS) and i would like to do ajax calls to a REST WS which is on another domain on client side. I intend to use oauth2 and SSL to secure ...
6
votes
1answer
96 views

Design a webapp that uses OAuth, but with tokens that can't be used by the operator?

I'd like to make a webapp that would allow users to OAuth with Stack Exchange, so that they can perform actions like voting through the app. I'm stuck at one point, though: I know how to perform ...
5
votes
2answers
283 views

Multi sub-domain login for content, spring security for main

Illustration : mainsite.com and contentsite.com both are being developed for same company by two teams. we will have login etc at mainsite.com contentsite.com will have some content that is not ...
5
votes
3answers
3k views

SAML2 vs. OAuth - What are some reasonable relationships?

I have a service that allows SSO via SAML2. When SAML2 is used, we delegate the entire authentication process to the Identity Provider. We are considering adding OAuth in order to support some ...
5
votes
1answer
869 views

Does it make sense to implement OAuth when no 3rd party is involved

I own a REST API at server side and a distinct web application that would call those APIs. I want to secure my APIs calls. After some reading, I want to implement the OAuth 1.0a mechanism at server ...
5
votes
1answer
191 views

Are most app OAuth implementations vulnerable because of an obscured URL/origin?

I cringe every time I am prompted with OAuth in an app because of the lack of ability to verify that the page is actually originating from the represented source. Are most app OAuth implementations ...
5
votes
1answer
102 views

If a service that I registered with FB/Twitter/G+ is hacked, what mischief can be done with the oauth token?

Case in point, TrueCaller. I had logged into TC using a proxy twitter account. I am assuming that as part of the authentication process, an access_token must have been saved by TC. If the hackers ...
5
votes
1answer
1k views

Is it safe to store twitter access tokens client side?

After the Twitter oauth process, once I finally get my access_token_key and access_token_secret is it safe to store these in a javascript variable client side? As far as I can work out nothing can be ...
5
votes
2answers
147 views

Should we store accesstoken in our database for oauth2?

I have a requirement to implement Facebook and Google login in my web application. I also need to access a user's Facebook/Google+ friend list. I have gone through the complete OAuth2 documentation of ...
5
votes
1answer
329 views

API Design Model - Client Side Encryption

I'm currently designing a API Model to use. A user will have a 'secret_api_key' and a 'public_api_key'. They will send a request to my server with the public key, the form data, and then a hash. The ...
5
votes
1answer
75 views

What are the security challenges encountered with attribute exchange?

OpenID has Attribute Exchange, Facebook has Facebook Connect, and authorization services such as Oauth enable access to user data distributed across a range of content providers. What are the ...
5
votes
1answer
165 views

Why should I persist OAuth 2 access tokens along with refresh token

That's something I've came across in a couple articles about OAuth 2: when it comes to persisting refresh tokens to database some authors prefer to store access token as well, or at least mention it ...
4
votes
1answer
152 views

oauth2 account authentication

imagine you secured your application with oauth2 and several oauth providers. Now imagine someone using provider A with email bob@example.com to log in. Next time, someone uses provider B with the ...
4
votes
2answers
725 views

Is there any drawback of using OAuth “pseudoauthentication” as opposed to OpenID?

I have seen posts that insist that OAuth is an orthogonally different thing from OpenID, because OpenID is about authenticating users, while OAuth is about giving access to certain services to a third ...
4
votes
2answers
178 views

Google+ Sign In - One Time Code Flow vs Pure Server Side flow

I'm reading the documentation about Google+ Sign In, more specifically, its server side flow. It says (https://developers.google.com/+/web/signin/redirect-uri-flow) that one-time code flow has ...
4
votes
3answers
794 views

OAuth2 authorization - save token in the cookies or in the session?

I'm a security newbie. I'm implementing oauth on my site and I want to ask where I should save my access token: cookies session (will be fetch from the server via ajax request) I have backend ...
4
votes
1answer
628 views

Does returning `Access-Control-Allow-Origin: *` weaken the security of JSON GET responses?

The W3C CORS recommendation states: Certain types of resources should not attempt to specify particular authorized origins, but instead either deny or allow all origins. ... 3. A GET ...
4
votes
1answer
535 views

Compromised JSON Web Token (JWT) Bearer Token

We are implementing a REST service that requires authentication and authorization. Because of the stateless nature of REST API's, we want to use JWT to make authenticated calls to the API through a ...
4
votes
1answer
322 views

Oauth Consumer Secret?

Using OAuth you have a consumer key and consumer secret to identify your application and the user provides an OAuth access token and secret to authenticate your application access to their account, ...
4
votes
1answer
451 views

Authenticate users through Google using only an OAuth2 access token

I have a question about having users logon to my service using their Google Credentials. I've gone through the Using OAuth 2.0 for Login documentation provided by Google. The documentation mentions ...
4
votes
1answer
66 views

OAuth - Why exchange the authcode for a token

In OAuth, when the user authorizes the client the client gets a authorization code, the client then exchanges this for a token that is used to access the resource. Why do we need to do this extra ...
3
votes
2answers
807 views

OAuth User revoke token

I haven't read it myself but a colleague told me that the end-user can revoke his/her OAuth token. I searched but I couldn't find enough docs on: is this true / is the end-user the one to revoke the ...
3
votes
1answer
375 views

Will using external OAuth providers for authentication protect users better than custom authentication?

On StackExchange we have the ability to choose to use our existing credentials with external OAuth providers such as Facebook or Google. This is convenient for users, but does it also have potential ...
3
votes
1answer
876 views

Why is OAuth 2.0 being used for mobile devices, and not OpenID?

Microsoft Azure Mobile services exclusively uses OAuth 2.0 for authentication, and many other providers mention the use of OAuth 2.0 specifically when referring to mobile devices. Question What ...
3
votes
3answers
168 views

OAuth in open-source plugin

I'm designing an API server and client pair. Typically, I want the client to be in a WordPress plugin. I'd like to use OAuth or something similar to secure the requests. However, as you know, OAuth ...
3
votes
3answers
682 views

Access Control and Authentication using Facebook access tokens in a webapp

I'm working on a mobile app with a web backend. We'd like to have users authenticate (log in) themselves through Facebook only, so we don't have to store passwords etc. and don't force users to create ...