I will like to know how does Stackoverflow maintain the additional details of users logging in using open-ids? In my knowledge, the details of these users are stored in the server of google,facebook etc. (The ones whose open id is being used). How then this site is also storing info about user's points, badges, privileges etc.?
Open id Selector, the one being used by Stackoverflow, is a client side javascript library so how is this possible?
Is a separate database created? If yes, how? There is no registration even!
Please provide the details of how this is being done.
When you login, the server checks if you already have an account. If there is no entry (it is the very first login), the server will automatically create a new user and save the openid identifier.
So the next time you login, the row is already there, and Stack Overflow will recognize you. By the way, you can learn the id of your database entry by looking at your profile url.
The JavaScript openid-selector is not involved in any of this. It just is a convenience feature which allows easy selection of an openid provider. All its magic is done before the openid magic takes place.
Related
Maybe I am missing something here, or this is a flaw in Auth0? I'll give an example of my issue:
Let's say I have my Default App (client), hooked up to that I have Username-Password-Authentication (database connection) and google-oauth2 (social connection).
A user comes to my site, signs up via google-oauth2 (social connection) using joe#gmail.com. Once complete, he gets added to my users in Auth0, all great.
A few months later, Joe comes back to my site, and being a busy guy, he forgets he signed up to my site before. This time, he decides to sign up using my custom Email and Password form, that will add the user to the Username-Password-Authentication (database connection). so he signs up there using joe#gmail.com again, and everything goes well, he is now listed in my user's section in my Auth0 dashboard.
This is the problem, I now have two joe#gmail.com accounts, one with google-outh2 and one with Username-Password-Authentication. I really can't have this, I need a unique email address, regardless of the ID Auth0 supplies.
Does anyone know how I can make email address in my user section 100% unique? I'd think a rule would do this, but it appears rules only apply AFTER a user has been registered, so I can't run a rule before adding?
the only way I can see doing this right now is make my own checks and delete via the management API, but that is a really long and messy way to do it I feel.
Any help will be appreciated here!
Thanks!
Auth0's default behavior is to create a new account in the database for every unique entry. Since the user created using Google has a unique id (based on google-oauth2), and the user created using the sign-up form has a unique id - they will technically be considered two separate accounts. In order to resolve this disparity, you can establish a means with which the account data can be merged. In the documentation linked provided above, there are examples of three possible ways of doing this:
Automatic Linking - which involves creating a specific rule to merge users based on matching emails
User-Initiated Linking - which involves providing a UI for users to opt into merging users with matching emails
Suggested Account Linking - which involves setting up a rule that is linked into the UI
One important thing to consider is that the data returned from different social identity providers may not be normalized the way that data is normalized onto the Username-Password-Database. For example, while auth0's default for emails is to lowercase the information, google-oauth2 may return emails as Uppercased - creating the potential for non-matching emails when checks are made using strict equality
The option you are looking for is called account linking.
You can find more info at https://auth0.com/docs/link-accounts
I'm trying to create a website to authenticate users through the use of a throwaway password where the assumption is that the user might not use the website again (basically a one time access).
I have done my research on OTP and various solutions to authentication but these don't seem to fit my requirements, most of them seem to rely on users having login credentials to the website whereas my system would allow them access without the need for registering.
The implementation of passwordless authentication by Auth0 seems to fit what you're describing. Even if you were not considering a third-party provider it may be useful to go through the documentation.
Basically, a user can login to a site without any need for a sign-up process. They can do so just by requesting that a one time code is delivered to them, for example, either by email or SMS.
This way, they can get quick access without having to setup a user and in the event that they do come back your application can recognize this because they will most likely be using the same mechanism, that is, you can use the email or mobile phone as the unique identifier.
Disclosure: I'm an Auth0 engineer.
If you do not require your users to register, why do you need authentication at all?
Why not just set a cookie with an unique identifier on the first visit? You can store data at the server side associated with that identifier. Keep track of when you last saw the user, and if they do not return within a certain period, you can delete any data you stored for that user.
I'm trying to design MVC4.5 website on Azure with latest EF but stuck in setting up membership and role base authentication.
I'm somewhat lost in MembershipProvider, SimpleMembershipProvider and ExtendedMembershipProvider.
I found that unlike SqlMembershipProvider the SimplememberShipProvider is not designed to store multiple applications (through ApplicationName and ApplicationID) in a single database and map users accordingly so that business can run multiple applications with only one database.
I hear all praises of SimpleMembershipProvider, my question is how should the database/providers be designed so that I'm able to store user's in association with respective applications in a single database. User registration info must be completely independent from same user name in other application. I also need new features of Open Authentication.
Broadly, my queries are:
Is it possible to use SimpleMmebershipProvider to differentiate between multiple applications in a single database.
I'm thinking to modify existing schema structure made by SimpleMembershipProvider to include ApplicationId column , but then how would even a custom provider that is inherited from Extended membership provider add ApplicationId against any user.
Is there any other provider available or any article that would guide in implementing custom membership provider with custom database design along with features of open authentication.
Or am I going with completely wrong approach?
Answering to the queries of BernardG
Do you want a "head" url/site, then redirect users to the proper
application, or
No, sites should not appear related nor will be redirect to other.
Do you want a user to enter into any application and
then be redirected to another one he is registered in.
Again no, each application should have it's own registration process. Further two applications can have same username but these accounts would not be related.
Can a user register into any application?
Yes.
If not, how do you limit that?
Not limiting.
What do you mean by this?"User registration info must be completely
independent from same user name in other application."
Refering to answer to point 2, if there are 4 applications with one database and a user registers for one application, he must need to register again to have access to other application. Hence for any user the sites must not appear related.
Do you want to duplicate users info into each applications?
As per my understanding of the question a combination of username and email address (considering this combination makes any user account unique) can again be stored against another application even with different profile information.
Actually I'm used to the classic membership approach used in ASP.net 2.0 and I'm missing the application Id column for separation.
If I may, I believe your question has a lot more to do with design and establishing clearly the features you want, rather than a specific membership provider, knowing that you can do about anything you want with SimpleMembership.
My questions, and I believe those are the questions you have to ask yourself before going further, are:
Do you want a "head" url/site, then redirect users to the proper
application, or
Do you want a user to enter into any application and
then be redirected to another one he is registered in.
Can a user register into any application?
If not, how do you limit that?
What do you mean by this?"User registration info must be completely
independent from same user name in other application."
Do you want to duplicate users info into each applications?
It looks to me that this is all about database(s) design, and analysis, for your real needs. Once that's properly done, the part about membership tables will be easily solved.
I am thinking for ways to implement a mechanism which enables a user to vote,without logging any of his details. Each user has a set of attributes that enable him to vote. For eg. Id,name,email-id.
Using these attributes we must guarantee that the user can vote for the first time. During this time,complete anonymity is guaranteed.
But if the user comes for a second time to vote,he should not be allowed to vote. Is this remotely possible?We are not storing any of the information related to the user.No ip adddress,email-id or student id. They are just used as a means of authentication.
I read many research papers for this but not able to find anything specific.
a mechanism which enables a user to vote,without logging any of his
details
Sure you can. Just don't log anything. But you do need to store information about which user has voted. You actually need info of the user not even the machine the user used as the user could vote from another machine.
I'm reading about Federated Login for Google Account Users to figure out how I can have a user log in to a web application using their Google Account.
So towards the end of the process, Google returns a Google supplied identifier which is appended as openid.claimed_id. This means the web application uses this identifier to recognize the user and allow access to application features and data. My question is, is this identifier static? Can I use this identifier to repeatedly id the same user?
Yes. Consider the openid.claimed_id value to be the username. Especially with Google, but this is true for any OpenID Provider that truly implements 'directed identity', don't consider this username to be correlatible with other web sites. Any other relying party besides your own web site will get a different claimed_id value for the same Google user, by design.
Also, be sure to treat this claimed_id as case sensitive.
The specific answer to your question is found in Googles OpenID API documentation:
The Google-supplied identifier, which has no connection to the user's actual Google account name or password, is a persistent value; it remains constant even if the user changes their Google user name and/or email address. This identifier is also a "directed identity", that is, Google returns a different value to each relying party. Google uses the request parameter openid.realm to recognize the relying party, so if the third-party application decides to change this value, all user identifiers will change.
In fact, I just ran into an instance where the google claimed_id had changed for my test user. I was coming to the end of implementing OpenID into my app, and for no apparently reason the claimed_id in the response data is had changed.
I've been testing with this account for the past couple weeks, and the claimed_id was the same this entire time, as expected. Then wham, changed! I looked at the response data many times to verify, and the underlying code to retrieve the data had not changed.
I'm not sure how to handle this at the moment, but I think this is going to throw me for a loop. After initial authentication, users register to the site (as you might expect) and setup a screen name. How are we to verify it is the same user if the claimed_id had changed? We certainly can't use email address, per best practices.
EDIT
Now I have pie in my face! I missed one little detail, that turned out to be a major detail. I change my development environment and was hosting on a different v-host. This effectively change the realm, and this will change the claimed_id response according to the docs.
This was a good lesson for me, as I was about to implement OID on a subdomain in which realm was being set automatically in my code. Now I saved myself a headache down the road, because I would not have been able to use the same user database across all other sub-domains without breaking identity.
updating realm
MORE INFO
Just as a side note - even if you are developing your OpenID solution for one of your subdomains, it might be prudent for you to specify realm to your top-level domain.
e.g., openid.realm = http://*.yourdomain.com
It will allow you to expand your sign-in page across all your subdomains and keep user identity across them.
(optional) Authenticated realm. Identifies the domain that the end
user is being asked to trust. (Example: "http://*.myexamplesite.com")
This value must be consistent with the domain defined in
openid.return_to. If this parameter is not defined, Google will use
the URL referenced in openid.return_to.