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Using SAML 2 Bearer token with our own UAA Server #uaa
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Shetty, Viraj S [CTR]
I am trying to prototype a situation where a user is already authenticated to an On-prem application using ADFS using SAML. Now, this application needs to call a web service deployed on cloud.gov (Cloud foundry). We also have our own instance of UAA running in cloud.gov which is used for authorization. IF the user has already been authenticated with the on-prem application, then it should be possible to exchange the SAML token with an OAuth Bearer token with the UAA Server installed on cloud.gov. So, as a prototype I obtained the SAML token for a user and tried to exchange with OAuth Bearer token by calling the UAA on cloud.gov as specified in
https://docs.cloudfoundry.org/api/uaa/version/74.4.0/index.html#saml2-bearer-grant However, I keep getting an error no matter what. I even decrypted the SAML token and then sent the Base64 URI but still no luck. The error I am getting is the following Anyone has any ideas why this might be happening ? 10:44:22.088: [APP/PROC/WEB.0] [2019-12-10 15:44:22.086] uaa - 7 [http-nio-8080-exec-2] .... ERROR --- SecurityFilterChainPostProcessor$HttpsEnforcementFilter: Uncaught Exception:
10:44:22.088: [APP/PROC/WEB.0] java.lang.ClassCastException: class org.opensaml.saml2.core.impl.ResponseImpl cannot be cast to class org.opensaml.saml2.core.Assertion (org.opensaml.saml2.core.impl.ResponseImpl and org.opensaml.saml2.core.Assertion are in unnamed module of loader org.apache.catalina.loader.ParallelWebappClassLoader @3ed242a4)
10:44:22.088: [APP/PROC/WEB.0] at org.cloudfoundry.identity.uaa.authentication.SamlAssertionDecoder.doDecode(SamlAssertionDecoder.java:97) ~[cloudfoundry-identity-server-74.5.0.jar:?]
10:44:22.088: [APP/PROC/WEB.0] at org.opensaml.ws.message.decoder.BaseMessageDecoder.decode(BaseMessageDecoder.java:79) ~[openws-1.5.6.jar:?]
10:44:22.088: [APP/PROC/WEB.0] at org.opensaml.saml2.binding.decoding.BaseSAML2MessageDecoder.decode(BaseSAML2MessageDecoder.java:70) ~[opensaml-2.6.6.jar:?]
10:44:22.088: [APP/PROC/WEB.0] at org.springframework.security.saml.processor.SAMLProcessorImpl.retrieveMessage(SAMLProcessorImpl.java:105) ~[spring-security-saml2-core-1.0.9.RELEASE.jar:1.0.9.RELEASE]
10:44:22.088: [APP/PROC/WEB.0] at org.springframework.security.saml.processor.SAMLProcessorImpl.retrieveMessage(SAMLProcessorImpl.java:172) ~[spring-security-saml2-core-1.0.9.RELEASE.jar:1.0.9.RELEASE]
10:44:22.088: [APP/PROC/WEB.0] at org.springframework.security.saml.SAMLProcessingFilter.attemptAuthentication(SAMLProcessingFilter.java:85) ~[spring-security-saml2-core-1.0.9.RELEASE.jar:1.0.9.RELEASE]
10:44:22.088: [APP/PROC/WEB.0] at org.cloudfoundry.identity.uaa.authentication.BackwardsCompatibleTokenEndpointAuthenticationFilter.attemptTokenAuthentication(BackwardsCompatibleTokenEndpointAuthenticationFilter.java:218) ~[cloudfoundry-identity-server-74.5.0.jar:?]
10:44:22.088: [APP/PROC/WEB.0] at org.cloudfoundry.identity.uaa.authentication.BackwardsCompatibleTokenEndpointAuthenticationFilter.doFilter(BackwardsCompatibleTokenEndpointAuthenticationFilter.java:114) ~[cloudfoundry-identity-server-74.5.0.jar:?]
10:44:22.088: [APP/PROC/WEB.0] at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.1.6.RELEASE.jar:5.1.6.RELEASE]
10:44:22.088: [APP/PROC/WEB.0] at org.cloudfoundry.identity.uaa.authentication.ClientBasicAuthenticationFilter.doFilterInternal(ClientBasicAuthenticationFilter.java:142) ~[cloudfoundry-identity-server-74.5.0.jar:?]
10:44:22.088: [APP/PROC/WEB.0] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.1.10.RELEASE.jar:5.1.10.RELEASE]
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Filip Hanik
ClassCastException: class org.opensaml.saml2.core.impl.ResponseImpl cannot be cast to class org.opensaml.saml2.core.Assertion The SAML 2 Bearer Grant expects an Assertion XML in the parameter `assertion` You are currently passing a `Response` XML data instead. Correct: <saml:Assertion> Incorrect: <samlp:Response> |
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Martijn de Boer
Hi,
For SAML Bearer an Assertion object is expected as bas64-url(base64(assertion)). Looks like you are send not the Assertion, but the SAML response object.
See
10:44:22.088: [APP/PROC/WEB.0] java.lang.ClassCastException: class org.opensaml.saml2.core.impl.ResponseImpl cannot be cast to class org.opensaml.saml2.core.Assertion (org.opensaml.saml2.core.impl.ResponseImpl and org.opensaml.saml2.core.Assertion are in unnamed module of loader org.apache.catalina.loader.ParallelWebappClassLoader @3ed242a4)
Regards,
Martijn
Gesendet: Dienstag, 10. Dezember 2019 um 18:06 Uhr
Von: "vshetty via Lists.Cloudfoundry.Org" <vshetty=fdic.gov@...> An: cf-dev@... Betreff: [cf-dev] Using SAML 2 Bearer token with our own UAA Server #uaa I am trying to prototype a situation where a user is already authenticated to an On-prem application using ADFS using SAML. Now, this application needs to call a web service deployed on cloud.gov (Cloud foundry). We also have our own instance of UAA running in cloud.gov which is used for authorization. IF the user has already been authenticated with the on-prem application, then it should be possible to exchange the SAML token with an OAuth Bearer token with the UAA Server installed on cloud.gov. So, as a prototype I obtained the SAML token for a user and tried to exchange with OAuth Bearer token by calling the UAA on cloud.gov as specified in
https://docs.cloudfoundry.org/api/uaa/version/74.4.0/index.html#saml2-bearer-grant However, I keep getting an error no matter what. I even decrypted the SAML token and then sent the Base64 URI but still no luck. The error I am getting is the following Anyone has any ideas why this might be happening ? 10:44:22.088: [APP/PROC/WEB.0] [2019-12-10 15:44:22.086] uaa - 7 [http-nio-8080-exec-2] .... ERROR --- SecurityFilterChainPostProcessor$HttpsEnforcementFilter: Uncaught Exception:
10:44:22.088: [APP/PROC/WEB.0] java.lang.ClassCastException: class org.opensaml.saml2.core.impl.ResponseImpl cannot be cast to class org.opensaml.saml2.core.Assertion (org.opensaml.saml2.core.impl.ResponseImpl and org.opensaml.saml2.core.Assertion are in unnamed module of loader org.apache.catalina.loader.ParallelWebappClassLoader @3ed242a4)
10:44:22.088: [APP/PROC/WEB.0] at org.cloudfoundry.identity.uaa.authentication.SamlAssertionDecoder.doDecode(SamlAssertionDecoder.java:97) ~[cloudfoundry-identity-server-74.5.0.jar:?]
10:44:22.088: [APP/PROC/WEB.0] at org.opensaml.ws.message.decoder.BaseMessageDecoder.decode(BaseMessageDecoder.java:79) ~[openws-1.5.6.jar:?]
10:44:22.088: [APP/PROC/WEB.0] at org.opensaml.saml2.binding.decoding.BaseSAML2MessageDecoder.decode(BaseSAML2MessageDecoder.java:70) ~[opensaml-2.6.6.jar:?]
10:44:22.088: [APP/PROC/WEB.0] at org.springframework.security.saml.processor.SAMLProcessorImpl.retrieveMessage(SAMLProcessorImpl.java:105) ~[spring-security-saml2-core-1.0.9.RELEASE.jar:1.0.9.RELEASE]
10:44:22.088: [APP/PROC/WEB.0] at org.springframework.security.saml.processor.SAMLProcessorImpl.retrieveMessage(SAMLProcessorImpl.java:172) ~[spring-security-saml2-core-1.0.9.RELEASE.jar:1.0.9.RELEASE]
10:44:22.088: [APP/PROC/WEB.0] at org.springframework.security.saml.SAMLProcessingFilter.attemptAuthentication(SAMLProcessingFilter.java:85) ~[spring-security-saml2-core-1.0.9.RELEASE.jar:1.0.9.RELEASE]
10:44:22.088: [APP/PROC/WEB.0] at org.cloudfoundry.identity.uaa.authentication.BackwardsCompatibleTokenEndpointAuthenticationFilter.attemptTokenAuthentication(BackwardsCompatibleTokenEndpointAuthenticationFilter.java:218) ~[cloudfoundry-identity-server-74.5.0.jar:?]
10:44:22.088: [APP/PROC/WEB.0] at org.cloudfoundry.identity.uaa.authentication.BackwardsCompatibleTokenEndpointAuthenticationFilter.doFilter(BackwardsCompatibleTokenEndpointAuthenticationFilter.java:114) ~[cloudfoundry-identity-server-74.5.0.jar:?]
10:44:22.088: [APP/PROC/WEB.0] at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.1.6.RELEASE.jar:5.1.6.RELEASE]
10:44:22.088: [APP/PROC/WEB.0] at org.cloudfoundry.identity.uaa.authentication.ClientBasicAuthenticationFilter.doFilterInternal(ClientBasicAuthenticationFilter.java:142) ~[cloudfoundry-identity-server-74.5.0.jar:?]
10:44:22.088: [APP/PROC/WEB.0] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.1.10.RELEASE.jar:5.1.10.RELEASE]
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Shetty, Viraj S [CTR]
Thanks Filip. You are correct and thanks for pointing it out. I will pass Assertion and see what happens.
As a side question - I am assuming that the Assertion would have to be unencrypted. right ? Does this matter ? Thanks, Viraj |
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Filip Hanik
Assertion can be signed, encrypted(name ID) or both. Unsigned and Unencrypted is not recommended. Filip Thanks Filip. You are correct and thanks for pointing it out. I will pass Assertion and see what happens. |
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Shetty, Viraj S [CTR]
Still having issues. I tried several things and they all seem to fail.
1. Per the documenatation, the URL should go to http://vyscu3.localhost:8080/uaa/oauth/token/alias/vyscu3.cloudfoundry-saml-login. For my environment, this should probably be http://<host>/uaa/oauth/token/alias/cloudfoundry-saml-login-dev How do I find if this URL is correct ? The receipient in the SAML Asserrtion is https://<host>/saml/SSO/alias/cloudfoundry-saml-login-dev. tried this as well. 2. When i used with encrypted assertion below, i get the following exception <EncryptedAssertion xmlns="urn:oasis:names:tc:SAML:2.0:assertion"><xenc:EncryptedData ...... 2019-12-10T16:51:10.13-0500 [APP/PROC/WEB/0] OUT java.lang.ClassCastException: class org.opensaml.saml2.core.impl.EncryptedAssertionImpl cannot be
cast to class org.opensaml.saml2.core.Assertion (org.opensaml.saml2.core.impl.EncryptedAssertionImpl and org.opensaml.saml2.core.Assertion are in unna
med module of loader org.apache.catalina.loader.ParallelWebappClassLoader @3ed242a4)
2019-12-10T16:51:10.13-0500 [APP/PROC/WEB/0] OUT at org.cloudfoundry.identity.uaa.authentication.SamlAssertionDecoder.doDecode(SamlAssertionDec
oder.java:97) ~[cloudfoundry-identity-server-74.5.0.jar:?]
2019-12-10T16:51:10.13-0500 [APP/PROC/WEB/0] OUT at org.opensaml.ws.message.decoder.BaseMessageDecoder.decode(BaseMessageDecoder.java:79) ~[ope
nws-1.5.6.jar:?]
3. then i tried unencrypted assertion, which gave me another exception
2019-12-10T16:45:24.58-0500 [APP/PROC/WEB/1] OUT Caused by: org.opensaml.common.SAMLException: Assertion invalidated by subject confirmation - can'
t be confirmed by the bearer method
2019-12-10T16:45:24.58-0500 [APP/PROC/WEB/1] OUT at org.springframework.security.saml.websso.WebSSOProfileConsumerImpl.verifySubject(WebSSOProf
ileConsumerImpl.java:400)
2019-12-10T16:45:24.58-0500 [APP/PROC/WEB/1] OUT at org.springframework.security.saml.websso.WebSSOProfileConsumerImpl.verifyAssertion(WebSSOPr
ofileConsumerImpl.java:296)
2019-12-10T16:45:24.58-0500 [APP/PROC/WEB/1] OUT at org.springframework.security.saml.websso.WebSSOProfileConsumerImpl.processAuthenticationRes
ponse(WebSSOProfileConsumerImpl.java:214) UAA does not seem to like the subject. Looking at the subject confirmation tag, there is attribute 'method' which is 'urn:oasis:names:tc:SAML:2.0:cm:bearer' Any ideas ? IS there any expanation other than the UAA Api ? |
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Filip Hanik
1. Take a look at the endpoint `/saml/metadata` on your server. For example https://login.run.pivotal.io/saml/metadata In the metadata, take a look at: urn:oasis:names:tc:SAML:2.0:bindings:URI binding, for the exact location to POST your Assertion <md:AssertionConsumerService Binding="urn:oasis:names:tc:SAML:2.0:bindings:URI" Location="https://login.run.pivotal.io/oauth/token/alias/login.run.pivotal.io" index="1"/> 2. You can have the NameID encrypted, not the assertion itself. Correct: <saml:Assertion> Incorrect: <samlp:Response> Incorrect: <saml:EncryptedAssertion> 3. A fully working example you can run in your Debugger can be viewed here (no server required) Still having issues. I tried several things and they all seem to fail. |
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