douxie9471
2016-11-21 15:43
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如何在PHP中检索SAML2令牌以从WSO2 APIM获取OAuth令牌

I have been looking around for a solution but can't find it.

This question is directly related to:

Here's the scenario I want to execute:

  1. authenticate to the SP using SAML2. Coded in PHP with SimpleSamlPhp.
  2. get an OAuth token from the API mgr endpoint, using the SAML2 assertion. (using URL http://api.gateway/token)
  3. call APIs over the API mgr's gateway, using the OAuth token.

I'm stuck at the instruction: get the SAML2 assertion token. Where do I find this token? In SimpleSamlPhp I can get attributes of the user, or their id, but I can't find any assertion.

I hacked SSP to get the last assertion, but don't know what to do with it. I was expecting a single value (like a token), but it's a complex structure. And one of the links above says I shouldn't be accessing it!

What do I send, encoded, to the token URL?


EDIT: adding some samples. My assert XML (edited):

<?xml version="1.0" encoding="UTF-8"?>
<saml2:Assertion xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion" xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol" ID="okdjgbm...jdbh" IssueInstant="2016-11-28T09:49:45.808Z" Version="2.0">
   <saml2:Issuer Format="urn:oasis:names:tc:SAML:2.0:nameid-format:entity">https://g...p.com:9443/samlsso</saml2:Issuer>
   <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
      <ds:SignedInfo>
         <ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#" />
         <ds:SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" />
         <ds:Reference URI="#okd...kejdbh">
            <ds:Transforms>
               <ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature" />
               <ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#" />
            </ds:Transforms>
            <ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
            <ds:DigestValue>RrGcR...cktFuH0=</ds:DigestValue>
         </ds:Reference>
      </ds:SignedInfo>
      <ds:SignatureValue>b91j/k...Z7d4=</ds:SignatureValue>
      <ds:KeyInfo>
         <ds:X509Data>
            <ds:X509Certificate>MIICNT...Wq8uHSCo=</ds:X509Certificate>
         </ds:X509Data>
      </ds:KeyInfo>
   </ds:Signature>
   <saml2:Subject>
      <saml2:NameID Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress">toto@titi.com</saml2:NameID>
      <saml2:SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:bearer">
         <saml2:SubjectConfirmationData InResponseTo="_80258326a1...cd4bbd" NotOnOrAfter="2016-11-28T09:54:45.807Z" Recipient="http://1.2.3.4/simplesamlphp/www/module.php/saml/sp/saml2-acs.php/wso2-sp" />
      </saml2:SubjectConfirmation>
      <saml2:SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:bearer">
         <saml2:SubjectConfirmationData InResponseTo="_8025832...d4bbd" NotOnOrAfter="2016-11-28T09:54:45.807Z" Recipient="https://my.wso2.apim:8243/token" />
      </saml2:SubjectConfirmation>
   </saml2:Subject>
   <saml2:Conditions NotBefore="2016-11-28T09:49:45.808Z" NotOnOrAfter="2016-11-28T09:54:45.807Z">
      <saml2:AudienceRestriction>
         <saml2:Audience>mytestapp</saml2:Audience>
         <saml2:Audience>https://my.wso2.apim:8243/token</saml2:Audience>
      </saml2:AudienceRestriction>
   </saml2:Conditions>
   <saml2:AuthnStatement AuthnInstant="2016-11-28T09:49:45.815Z" SessionIndex="1f5192...b591">
      <saml2:AuthnContext>
         <saml2:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:Password</saml2:AuthnContextClassRef>
      </saml2:AuthnContext>
   </saml2:AuthnStatement>
   <saml2:AttributeStatement />
</saml2:Assertion>

encode as base64-URL-encoded XML:

PHNhbWwyO...dGlvbj4,

using the method copied from another SO post

function base64_url_encode($input) {
 return strtr(base64_encode($input), '+/=', '-_,');
}

It's about 20 lines long (and yes, there's a comma at the end).

It doesn't work, I get the JSON result

{"error":"invalid_grant","error_description":"Provided Authorization Grant is invalid."}

In the traces:

TID: [0] [AM] [2016-11-29 11:04:50,297] DEBUG {org.wso2.carbon.identity.oauth2.token.handlers.grant.saml.SAML2BearerGrantHandler} -  SAML Token Issuer verification failed or Issuer not registered {org.wso2.carbon.identity.oauth2.token.handlers.grant.saml.SAML2BearerGrantHandler}
TID: [0] [AM] [2016-11-29 11:04:50,298] DEBUG {org.wso2.carbon.identity.oauth2.token.AccessTokenIssuer} -  Invalid Grant provided by the client, id=fkJa...Ohoa, user-name=null to application=myapp-subscriber_test_PRODUCTION {org.wso2.carbon.identity.oauth2.token.AccessTokenIssuer}
TID: [0] [AM] [2016-11-29 11:04:50,300] DEBUG {org.wso2.carbon.identity.oauth2.token.AccessTokenIssuer} -  OAuth-Error-Code=invalid_grant client-id=fkJa...hoa grant-type=urn:ietf:params:oauth:grant-type:saml2-bearer scope=PRODUCTION {org.wso2.carbon.identity.oauth2.token.AccessTokenIssuer}

I'm asking around to the configurators of the system. Seems to me there's something missing in the link between IDS, APIM and OAuth, some declaration. (I googled this, and came up with a stackoverflow exchange to check the issuer id in the assertion, which I did, but I can't identify anything wrong there)

Thanks for the help, I will come back if I have anything new. Except of course if I have overlooked something obvious!

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