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Can the F5 APM API Protection profile use for a DNS resolver a local F5 DNS/GTM listener VS?
- Nov 08, 2022
I finally got to this (I upgraded to 16.1.3.2 from 16.1.3 so this could also be important) and I also tested with the pet store that was given as an example in https://support.f5.com/csp/article/K12744365?utm_source=f5support&utm_medium=RSS . With external DNS resolver (in my case google 8.8.8.8) it works like a charm and it seems to me that when referensing external or internal DNS resolvable API then the server mode is best used and when referensing a local pool of API servers then the pool mode is best used. My picture below is with the petstore servers without having a pool attached to the virtual server.
Now I have other issues as after intergrating with Azure AD as oauth provider and a sync of the public keys that are at https://login.microsoftonline.com/common/discovery/keys I see the F5 APM getting the keys every hour and they are correct but when I request a token with postman and get a correct token that I have checked at https://jwt.io/ the APM things that there is no valid key that signed the token but this seems like a Job for the support hah as the key is in the APM after I checked.
Nov 8 18:16:15 bigip1.com err apmd[12601]: 01490290:3: /Common/API-PETS_ap::77A02581./Common/oauth/HYQYY5JU7+XxiUmSSuLWgsiAtUEug9m2c9njSNvseiQ=:/Common/oauth_act_oauth_scope_subsession_ag: OAuth Scope: failed for jwt-provider-list '/Common/exampleJWTProvider' , error: None of the configured JWK keys match the received JWT token, JWT Header: eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6IjJaUXBKM1VwYmpBWVhZR2FYRUpsOGxWMFRPSSJ9
I even dumped the token with a subsession variable just to see if the APM is getting the correct one with variable assign agent in the Per-Request API protection policy " subsession.logon.last.jwt = expr { "[mcget {request.header.authorization}]"} " and the logging agent " %{subsession.logon.last.jwt} " and it is the the same one in Postman and valid so enough of the support was done by me 🙂
I am closing this and as a recommendation an external DNS resolver going to an IP address not on the same F5 device needs to be configured. I may create an iRule and community Tech Article with TCP::collect and TCP::respond to see if this can be bypassed but that is in the future.
Edit:
I even checked when the web browser clients are using authorization codes and F5 exchanges them with Azure AD for tokens and validates them it works normally without an issue ( with https://support.f5.com/csp/article/K07645403 the tokens the F5 per-request policy gets under "subsession.oauth.client.last.access_token" can be decrypted but a logging agent is used as the per-request policy does not have message agent ) but when tokens are send directly to the F5 with postman for API protection well it seems a bug to me.
As a note even on 16.1.3.5 the issue is still present.
This could be related to the issue that under oauth provider , when I try to do a discovery I get the error below, so for me F5 does not seem to be able to get the ssl certs from microsoft to check the JWT token but this is for F5 TAC and the developers to solve this nodejs issue .
Error in processing URL https://login.microsoftonline.com/xxxx/v2.0/.well-known/openid-configuration. The message is - java.net.UnknownHostException: login.microsoftonline.com
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