So I'm trying to integrate single sign-on with Auth0 (being both the service provider and the identity provider) with the Atlassian stack.
Atlassian offer SAML single sign-on. However, it is telling me:
Your users won't be able to log in with SAML single sign-on until you've copied
the values for SP Entity ID and SP Assertion Consumer Service URL to your
identity provider.
I've put the assertion consumer service URL in place of the callback URL, I've done some research and I'm almost certain this is correct.
However, the issue is with the Entity ID. Where does this go?
I've not used Auth0 before, but I think you have to set it as audience in the settings, e.g. see https://auth0.com/docs/protocols/saml/saml-apps/heroku
IMHO but the configuration option is a bit misleading. Instead of using audience, using EntityID might be clearer, as this is also the term used in the SAML spec.
I am assuming that auth0 acting as a service provider.
Assertions Consumer service URL should be :
https://YOUR_DOMAIN/login/callback?connection=YOUR_CONNECTION_NAME
Entity ID of the service provider should be:
urn:auth0:YOUR_TENANT:YOUR_CONNECTION_NAME
You can download service provider metadata like below in the XML format and upload to IDP to generate configuration.
Navigate to https://YOUR_DOMAIN/samlp/metadata?connection=YOUR_CONNECTION_NAME
Additional:
URI: urn:oasis:names:tc:SAML:2.0:nameid-format:entity Indicates that
the content of the element is the identifier of an entity that
provides SAML-based services (such as a SAML authority) or is a
participant in SAML profiles (such as a service provider supporting
the browser SSO profiles). Such an identifier can be used in the
element to identify the issuer of a SAML request, response,
or assertion, or within the element to make assertions about
system entities that can issue SAML requests, responses, and
assertions. It can also be used in other elements and attributes whose
purpose is to identify a system entity in various protocol exchanges.
The syntax of such an identifier is a URI of not more than 1024
characters in length. It is RECOMMENDED that a system entity use a URL
containing its own domain name to identify itself
(SAML CORE specification, section 8.3.6)
https://www.oasis-open.org/committees/download.php/7473/sstc-saml-core-2.0-draft-15-diff.pdf
https://spaces.at.internet2.edu/display/InCFederation/Entity+IDs
Related
I'm doing a technical assessment for a job interview. It's called on me to walk through implementing a client using OneLogin (IDP) into our software (SP) with SSO.
The activity is asking me to include 3 things:
Service Provider
Identity Provider
Generate and distribute the sp metadata to the client
I'm using https://www.samltool.com/sp_metadata.php to generate the metadata but I'm wondering what the purpose of this doing this when this SP is already a verified app on OneLogin?
OneLogin's knowledge base here doesn't indicate the need for the SP metadata to implement. It doesn't even call for any SP entity's or endpoints. It seems like I would need the idp metadata as the endpoints use a unique value but not the opposite. So am I right in assuming that generating and sending the client the SP metadata is useless? Or is there a reason for it?
If you're using a Onelogin catalog app, you often don't need any instance specific metadata from the SP. The catalog apps are supposed to shortcut and simplify configuring a standards based SAML supporting SP. Some of the Onelogin catalog apps sometimes need some metadata, such as a RelayState parameter as per the SP requirements. If a catalog app doesn't exist and you're building a custom SAML app in Onelogin, you'll need the SP metadata in full.
I!ve a question similar to How To Become a SAML Service Provider, but it misses some part I would like to clear up.
The SAML SSP profile spec describes several possible bindings, and states that the usage depends on SP and IdP setups.
The SAML Conformance and Profiles specifications identify the SAML
bindings that can legally be used with these two messages.
Specifically, an Authentication Request message can be sent from an SP
to an IdP using either the HTTP Redirect Binding, HTTP POST Binding,
or HTTP Artifact Binding. The Response message can be sent from an IdP
to an SP using either the HTTP POST Binding or the HTTP Artifact
Binding. For this pair of messages, SAML permits asymmetry in the
choice of bindings used. That is, a request can be sent using one
binding and the response can be returned using a different binding.
The decision of which bindings to use is typically driven by
configuration settings at the IdP and SP systems. Factors such as
potential message sizes, whether identity information is allowed to
transit through the browser (if not the artifact binding may be
required) , etc. must be considered in the choice of bindings.
The first question I have: as a Service Provider, am I free to choose any one of the SP -> IdP bindings, and it will work with any IdP out there, or I should make this configurable in my implementation and support all the bindings? (Nota bene: I will probably integrate an existing saml library to help my life, but I should know what configuration options should I allow and support on my interfaces.)
The second question is about the SamlResponse coming back from the IdP upon successful authentication. As far as I understand, SAML just tells me that the user suucessfully authenticated with the IdP. As a result I would expect to give me back some user identifiers in the Response, like a uid, username or e-mail address that I can query from a local user db or LDAP and run app-specific authorization logics.
How can I ask the IdP the user identifier I need and how/where will it be returned? I can't see anthing related to this in the Wikipedia example
Depending on what bindings your SAML-IdP and SP server supports, you can choose any combination of binding pair. Typically all major SAML-IdP supports most of binding specified in SAML-spec. Also you have to take security and performance considerations. Artifact is more secure but take two round-trips to complete SAML-Authn process, because it make back-end call communication (unlike POST or Redirect) while sending and receiving SAML messages. If your SAML-IdP and SP server supports binding configuration, then you use those bindings in runtime.
NameID format identifies user between IdP and SP, which is sent in SAML Assertion by IdP. It can be emailAddress, unspecified, transient, persistent and few others. Check Section (8.3) Name Identifier Format Identifiers from SAML Spec for more details. Also you could request IdP to send user attributes (that exist in IdP identity-store) in SAML Assertion.
I implement a SAML 2.0 SP.
I have a login servlet with endpoint https://my.domain.com/mng/samlLogin, so in the SP metadata file I define:
<md:AssertionConsumerService
Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"
Location="https://my.domain.com/mng/samlLogin" index="0" isDefault="true"/>
And send this endpoint in the AuthenRequest under the AssertionConsumerServiceURL.
Now, I have another servlet with a different functionality, and it needs to validate the user against SAML as part of its flow.
So I need to define the new servlet's URL as an additional endpoint, let's say https://my.domain.com/mng/myServletSamlLogin , which will get SAML authentication reponse.
Is this possible? Can I define multiple AssertionConsumerService elements for the same binding (HTTP-POST)?
Thanks!
Yes, you can include additional <md:AssertionConsumerService> elements in the SAML 2.0 SP metadata with the same binding, each with its own unique index. Alternatively you can choose to sign the authentication requests as the SP in which case you can freely specify an AssertionConsumerServiceURL without the requirement that it was published and configured earlier as part of the SP metadata exchange.
This is all spec compliant but be aware (as always with "advanced" SAML options) that your mileage may vary wrt. support across different SAML implementations.
Have a look at Assertion Consumer Service Glossary which will tell you that
Assertion Consumer Service
A SAML-compliant portion of PingFederate in an SP role that receives
and processes assertions from an IdP.
attributes
Distinct characteristics that describe a subject. If the subject is a
Web site user, attributes may include a name, group affiliation, email
address, etc.
attribute contract
A list of attributes, agreed to by the partners in an identity
federation, representing information about a user (SAML subject). The
attributes are sent from the IdP to the SP during SSO or STS
processing.
So you associate bindings to the Assertion Consumer Service (ACS) endpoint(s) where your SP will receive assertions.
I am trying to implement a SSO that is provided by another website.
The instructions ask me to enter "issuer" info. Which turns out is equivalent to the EntityID URL in the EntityDescriptor.
I am assuming I need to set that URL to some url on my server, but what I cant seem to figure out, is what that URL actually does.
I assume a file needs to be placed at that URL with some information, but I can not seem to work out what that info is.
So what info is required at the EntityID URL in order for this to work?
The requirement is that the EntityId is a URI (not URL, in this case the difference between URIs and URLs is important). See "8.3.6 Entity Identifier" in the SAML2 Core spec.
From SAML 2.0 Specification :
8.3.6 Entity Identifier
URI: urn:oasis:names:tc:SAML:2.0:nameid-format:entity
Indicates that the content of the element is the identifier of an
entity that provides SAML-based services (such as a SAML authority,
requester, or responder) or is a participant in SAML profiles (such as
a service provider supporting the browser SSO profile). Such an
identifier can be used in the element to identify the issuer
of a SAML request, response, or assertion, or within the
element to make assertions about system entities that can issue SAML
requests, responses, and assertions. It can also be used in other
elements and attributes whose purpose is to identify a system entity
in various protocol exchanges.
The syntax of such an identifier is a URI of not more than 1024
characters in length. It is RECOMMENDED that a system entity use a URL
containing its own domain name to identify itself.
The NameQualifier , SPNameQualifier , and SPProvidedID attributes MUST
be omitted
It is recommended that the URI is a URL that contains the domain name of the entity.
If you are to expose metadata, the EntityId is used as a well known URL for the meta data of the entity. It is not a requirement to provide meta data at all. If done, the meta data can be provided in any way possible - but the best practice is to publish it at the EntityId URL.
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.