I am working on providing a SSO solution to a customer who acts as an identity provider. He already has Siteminder on his side to generate SAML 1.1 assertions with user id and timestamp as parameters. Our task is to accept this assertion which is signed, decrypt it and send it to the authenticator we already have. The authenticator validates the info and gives access to our application. Here we act as the service provider.
I am new to SAML and have no idea how to integrate SAML to our current ASP login pages. Can u help me on how to accept these assertion requests from the Idp. They are using SAML/POST profile.
Thanks,
king
ASP login? Oh dear, you will have to manually decrypt, validate and accept/decline the token, and then map the user to whatever role based mechanism your application uses.
If you were on ASP.NET then the Windows Identity Framework would help.
Related
I created azure b2c custom policy using SAML flow and cannot find documentation what logout url should I use on SP side. What I see in saml policy metadata xml:
<SingleLogoutService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="https://tenant.b2clogin.com/tenant.onmicrosoft.com/B2C_1A_signup_signin_saml/samlp/sso/logout"/>
it does not work with my SP (zendesk) and shows error after logout redirect: AADB2C99046: The logout request does not include a session index. I investigated saml logout request and it does not contain session index element. As I understand SAML standard documentation SessionIndex is optional.
Is there any way to fix log out functionality with SAML?
here is the answer from Microsoft support:
After analyzed your request with our technical advisors and additional
resources, we got a confirmation that for your particular setup which
is having your B2C actuate as SAML Token Provider, the SessionIndex
along with NameID is a must and needs to be provided by your Service
Provider.
I know it is hard to track what requirements usually needs the setups
in B2C by having the information spread everywhere but in Azure AD B2C
the following are the two scenarios supported:
Have Azure AD B2C acting as an IdP and achieving SSO with SAML-based Service Providers
Have Azure AD B2C acting as a service provider (SP) and interacting with SAML-based identity providers like SalesForce and ADFS.
The first scenario (1), that one you have, it requires your custom
policy to setup your SAML token issuer, along with the
SAMLSSOSessionProvider the TechnicalProfile named as SM-Saml-Issuer.
SAML session logout will not work then without your SessionIndex and
NameID attributes coming from your SP.
This is the only way to achieve a successful SAML logout call from
your Service Provider.
Let me know if you have any questions, I can then review this and
forward it to our experts if necessary.
Best regards,
_____________________________________________________ Victor J. Hernandez | Support Engineer | Azure Support
Most SPs using SAML will create their own session after you are authenticated. This session is only used by the SP that set it up. To do this, logout must do the following: delete all SP sessions.
The only truly reliable way to completely log out of SAML SSO is to delete all sessions, including identity provider sessions and all service provider sessions. Normally, this can be done simply by closing the browser.
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'm a Service Provider (SP) who wants to support multiple Identity Providers (IdP) via Web SSO profile.
I'm struggling to understand how should I negotiate SAML features (e.g. signing/not signing AuthnRequests) with Identity Provider admins.
Here's my current understanding:
I create a single sp-metadata.xml which I expose to all IdPs who want to integrate with me.
To integrate with me, IdP admins upload their idp-metadata.xml via my web interface. I validate it against my sp-metadata.xml. If their metadata features don't match with my metadata features, I show them a detailed error on upload so they can change their setup.
Questions:
Is this a valid and common approach?
How do I write SP metadata to support all or most IdPs out-of-the-box? For example, should I put "AuthnRequestsSigned = false" or "AuthnRequestsSigned = true"? It seems that Web SSO Profile does not give strict guidance on this.
About 2: You can not really validate the IdP meta data against your SP meta data. Most IdP's do not tell if they accept a digitally signed SAML AuthnRequest. They also typically do not tell which signature algorithm or keysizes they support.
Some IdP implementation do not even create SAML meta data schema compliant meta data files.
If you care about security, then you should digitally sign the SAML AuthnRequest and either ask the IdP to ignore the signature in case your SP sends it.
Also note that there some update to the spec for some time ... see the new processing rules.
Alternative: During upload ask (checkbox/radio button) if they can handle a digitally signed SAML AuthnRequest and which signature algorithm has to be used.
I.e. Microsoft ADFS and Azure AD bail out with an non-descriptive SAML error response if they can not handle the SAML AuthnRequest.
Our company maintains a Web App composed of a front-end and a back-end in (Node.js), and we support the standard username/password login authentication. A couple of our partners have requested we support SAML SSO, so their end-users can access our web app through a link on their respective portals without the need to login again.
Question: Do we need to turn our app into a full-fledged service provider (SP) by implementing a SAML sdk/library in our front-end and back-end?
Or is it possible to use a 3rd party authentication provider like Okta to handle the SAML nitty-gritty behind the scenes and then redirect the end user to our app, with possibly a token (JWT?) so we can retrieve the user info from Okta?
I've read everything I could find on Okta's site, and here, and couldn't find a definitive answer, either yes it's possible (with example) or no you can't do that.
Like you already mentioned in your question, there are 2 possible ways to do it.
Update your application to support SAML login flow with your app as SP, in which case you will not need to use any 3rd party auth provider
If you don't want to get into the SAML nitty-gritty, you can use a 3rd party provider like Okta as an intermediary that will consume the SAML responses from the IdP (used by your external customers) and then convert that assertion into an Open ID token (JWT). In this case, Okta will act as an IdP (Authorization server) to your web app and generate ID tokens.
Your app will then need to implement the Open ID connect login flow.
You can refer to http://developer.okta.com/code/javascript/okta_sign-in_widget_ref for this.
I am working on a project that needs to be integrating SAML2.0. I was thrown into this project suddenly, i need to make it work.
Here is the background: We have created the files and wanted Client Company to integrate using SAML2 to get to our web site. We have sent them the meta datafile.
Now the client company had sent their metadata file. I dont know how and what to do with that file. Any help will be appreciated.
ASP.NET, Framework 4.0
The metadata file basically provides you information of your client. Such as entityID, credential, and so on. If it is an IdP then it also contain couple URLs so that you know where to send different request, e.g. login request, attribute query request. You need to give this metadata to your SAML component so that it know which client it should talk to.
Another main purpose is to establish a trust relationship between SP and IdP.
It's kind of old question but I would like to add some additional information and resources for .NET.
SAML Metadata is used to exchange configuration information between Service Provider and Identity Provider and vice versa. The information can include:
Binging location
Organization name
Contact Person
Single Sign On Url
Single Logout Url
The Metadata can be signed and encrypted so that the information is sent securely. The other side may need the corresponding public key to validate and decrypt it and then can be used to understand and establish the connection with the SP or IdP.
You can see some more info at the following blog posts:
http://samlcomponent.net/constructing-saml-metadata-xml-for-single-sign-on-idp/
http://samlcomponent.net/how-to-create-saml-metadata-xml-for-service-provider/
Security Assertion Markup Language (SAML) is a standard for logging users into applications based on their sessions in another context. This single sign-on (SSO) login standard has significant advantages over logging in using a username/password:
1.No need to type in credentials
2.No need to remember and renew passwords
3.No weak passwords
It is easy to manage all applications in one tree using SAML SSO login.
How actually SAML works:
The user accesses the remote application using a link on an intranet, a bookmark, or similar and the application loads.
The application identifies the user’s origin (by application subdomain, user IP address, or similar) and redirects the user back to the identity provider, asking for authentication. This is the authentication request.
The user either has an existing active browser session with the identity provider or establishes one by logging into the identity provider.
The identity provider builds the authentication response in the form of an XML-document containing the user’s username or email address, signs it using an X.509 certificate, and posts this information to the service provider.
The service provider, which already knows the identity provider and has a certificate fingerprint, retrieves the authentication response and validates it using the certificate fingerprint.
The identity of the user is established and the user is provided with app access.
Take a look at the metadata SAML 2.0 specification to check what elements must be read by your implementation.
If you are looking for a SAML2 .Net Tookit, take a look to this thread of stackoverflow
Also take a look on SAML open source implementations to learn how others resolved this problem before:
SimpleSAMLphp (PHP implementation Idp/SP). (Metadata parser)
Shibboleth IdP (Java) (opensaml2) / SP (C)
spring-security-saml: SP (Java) (metadata files)
Jboss (Java)
Metadata is nothing but the xml file containing all the information required by your SAML implementation to talk with host. you can extract information from this meta to get the desired information required. Like public/private keys.
I hope you are also using certificate to talk with host on secure manner.
This key is required for handshaking with unknown host system.