I am creating simple service provider (SP) on java with wso2 saml sso authorization.
I implemented it in this way (please correct me, if I'm wrong):
User inputs some target Url in browser
My SP's servlet sends redirect to WSO2 IDM.
IDM authorizes the user and redirect to my Consumer Url with
SAMLResponse and RelayState parameters.
Now SP must process this request and redirect user to target Url without redirection to IDM again. Otherwise I'll get the infinite loop, so I think that between step 1 and step 2 should be one more step...
What is the proper way to do this?
Typical implementation
1 User tries to access a protected site
2 A filter checks if the user has an authenticated session.
2.1 If not, redirect to IDP/IDM
2.1.1 IDM authenticates user and redirects back to SP with identity proof
2.1.2 SP creates authenticated session
2.1.3 User is redirected to target URL everything start from 2 again.
Here I have a post describing the flow in more detail
Related
I am implementing front-channel SAML 2.0 SSO golang Service Provider, with Okta as my Identity Provider (this is just a POC and should eventually work with any IdP).
Implementing the sign on process was straightforward with saml2 package. I've created the login endpoint that redirects to the SAML application login URL at the intended IdP, as well as the POST callback endpoint which is properly receiving the SAML assertion and is able to validate it. After that a session with a random cookie is created with the same TTL as the Identity Provider session TTL. So far everything works well (I haven't implemented Single Sign-Out yet, but I'm planning to).
However, when some time passes and the session expires, I'd like to renew it only if the user is still logged in with the Idp and hasn't been removed from the SAML Application. I would like to avoid redirecting the user to perform SSO again with IdP, because it would mean that if they are still logged in, they would be redirected back to the home page of my application. I wasn't able to find great sources on my options to go about it online.
Questions:
1.1 One solution that comes to mind is storing the requested URL in the RelayState parameter, whenever the session has expired, then redirect the user to the IdP SSO URL. When the redirect returns to the SAML callback POST endpoint, check the RelayState parameter and if set, redirect back to that (original) URL. That means that for users that use the system continuously, I would have to request Assertions very often. Does that make sense?
1.2 A second solution that comes to mind is to implement a back-channel of communicating directly from my SP to the IdP. That would allow me to verify a user is still logged in 'behind the users back'. If that's a sound idea:
a. Do I need to have dedicated code for each IdP?
b. Do I need to load an API key to the IdP which would allow secure communication?
c. Do I need to upload a public certificate to the IdP that would be able to verify that my SP signed the requests?
Will using the Assertion to get an OAuth 2.0 Access Token help me in achieving this?
I've chosen SAML 2.0 for now, since the environment is an enterprise oriented one and I thought it fits well with it based on what I read. Would using OpenID Connect instead help achieve my goals easier and fit well with enterprise oriented products?
I am trying to understand implementation of SSO system for service provider. Here are my questions.
User logs into System A. System A does authentication and displays a link to the user on page. When User clicks the link, System A redirects user to System B where System B is a 3rd party vendor. Who is IdP here and who is SP?
Is there any server to server communication in a flow initiated from IdP to SP? Is it required in all scenarios?
can you explain the data flow step by step in case of IdP initiated flow to SP?
Any material on this same or simple explanation will help.
In answer to your questions and assuming SSO via Security Markup Language (SAML):
System A is the Identity Provider (IdP) and System B is the Service Provider (SP).
There is no server-to-server communication. Information is passed via the client browser using HTTP bindings, for example HTTP POST.
Step by step IdP-initiated workflow (taken from OASIS SAML V2.0 Technical Overview):
If the user does not have a valid local security context at the IdP, at some point the user will be challenged to supply their credentials to the IdP site, idp.example.org.
The user provides valid credentials and a local logon security context is created for the user at the IdP.
The user selects a menu option or link on the IdP to request access to an SP web site, sp.example.com. This causes the IdP's Single Sign-On Service to be called.
The Single Sign-On Service builds a SAML assertion representing the user's logon security context. Since a POST binding is going to be used, the assertion is digitally signed before it is placed within a SAML message. The message is then placed within an HTML FORM as a hidden form control named SAMLResponse. (If the convention for identifying a specific application resource at the SP is supported at the IdP and SP, the resource URL at the SP is also encoded into the form using a hidden form control named RelayState.) The Single Sign-On Service sends the HTML form back to the browser in the HTTP response. For ease-of-use purposes, the HTML FORM typically will contain script code that will automatically post the form to the destination site.
The browser, due either to a user action or execution of an “auto-submit” script, issues an HTTP POST request to send the form to the SP's Assertion Consumer Service. The service provider's Assertion Consumer Service obtains the message from the HTML FORM for processing. The digital signature on the SAML assertion must first be validated and then the assertion contents are processed in order to create a local logon security context for the user at the SP. Once this completes, the SP retrieves the RelayState data (if any) to determine the desired application resource URL and sends an HTTP redirect response to the browser directing it to access the requested resource (not shown).
An access check is made to establish whether the user has the correct authorization to access the resource. If the access check passes, the resource is then returned to the browser.
I am implementing a SSO using SimpleSAMLPhp Service Provider.
I provided my metadata to remote Shibboleth Identity Provider and was provided a test account.
When a user visits a specific page on my SP, they get redirected to the IdP, login, and are redirected back to my web site with a bunch of IdP provided attributes. This part works.
This part I am struggling with.
If the user authenticates with the same IdP through a different Service Provider and then visits my page, how do I know they are already authenticated? Currently I am being asked to login again.
Is there a configuration value somewhere that lets me do this? Or am I using the wrong method? This is what I am doing.
$as = new SimpleSAML_Auth_Simple({REMOTE_AUTHSOURCE});
$as->requireAuth(); // this redirects to remote IdP login
$attributes = $as->getAttributes();
Thanks.
There are two separate authentication sessions to consider. One session is in you app and the other is at the IdP. The requireAuth method can tell if the user already has an authenticated session in your application, and will return immediately in that case.
There is no way for you to tell if a browser has a session at the IdP. You just call requireAuth whichs send the user there and if the IdP decides the user's session is still valid it will respond without prompting for login.
Are you saying that the user has a valid session at the IdP and they are being re-prompted to authenticate when you send the user there? That could be due to IdP policy, or if your app was sending something like 'forceAuth' in its AuthnRequest.
I'm in the midst of finding some means (preferably through Java code) that will enable me to get the SAML assertion from the IDP (i.e. ForgeRock's OpenAM) for a Service Provider (SP) via SSO Login.
The SP have already been configured to interact with the IDP (e.g. vCloud Director --> OpenAM and vice versa) through a Web Browser (i.e. the user will be automatically redirected to the OpenAM login page upon invoking the vCloud Director login page). However, this process is only applicable through browsers (where redirection is provided) but not outside the browser.
I can't seem to find any means to perform SSO Login (by using the SAML assertion from the IDP for authentication). So far I've come across a dozen of references including the AssertionIDRequestUtil.sendAssertionIDRequestURI function from the OpenAM SSO, still, I'm not sure where to retrieve the AssertionId and SAML EntityId parameters.
Are there other means of getting the SAML assertion? Or maybe other ways to perform SSO Login?
I think the easiest way to achieve this would be:
perform authentication via REST or ClientSDK
use a Java HTTP client to kick off an IdP initiated SAML authentication flow (/openam/idpssoinit?metaAlias=/idp&spEntityID=entityID). When you send this request you need to make sure that:
the session id is part of the request as an iPlanetDirectoryPro cookie,
session upgrade won't be performed (your authcontext settings at the IdP will have a lower or equal authLevel, than the level the session was created with in the first step)
Method 1
Browser is directed to Service provider. Service provider checks whether there is any cookie set, If no then it redirects browser to Identity provider and Identity provider(IdP) validates user and redirect a ID to Service Provider(SP). SP takes that ID and set it as session cookie in browser and redirects user to service. Next time, if user asks for service again in same session the SP checks for cookie and redirects directly to service.
Method 2
Browser is directed to Service provider. Service provider redirects to IdP. IdP checks for its cookie and if cookie is not present,IdP authenticates user and set session cookie in browser. Redirects positive response to SP. SP redirects user to service. Next time user asks for the service within the session, Browser is directed to Service provider. Service provider redirects to IdP.IdP checks for its cookie and if it is present,it sends positive response to SP.
I am pretty sure that Guanxi implementation of Shibboleth (SAML2 profile) and almost sure that Shibboleth itself can be simplified to your "method 1".
You better check some of existing SAML2 profile implementations.
I don't believe either of those are valid SAML implementations. Usually in SAML identity information is communicated in a HTTP POST or through SOAP web service (see: http://en.wikipedia.org/wiki/Security_Assertion_Markup_Language#SAML_2.0_bindings). Cookies are not used to 'authenticate' a user.
We have a web application that uses SAML 2.0 XML communicated in a HTTP POST to authenticate the user. Our customer's employees go through the identity provider on their side of the firewall to access our application.