why is keycloak removing the SSL in the redirect uri? - redirect

Question

We have a simple requirement where:
PS: https:/ === https://
When user hits https:/company_landing.company.com , they should be redirected to keycloak login page (at https:/ourcompany-keycloak.company.com). User enters his/her keycloak login credentials. Upon successful login to keycloak , they will be presented to the company_landing page.
The trouble is :
When User types - https:/company_landing.company.com
Keycloak tries to bring up the landing page but gives 500 Internal server error and says "Incorrect redirect uri" and in the browser I see this:
https:/ourcompany-keycloak.company.com/auth/realms/realm1/tokens/login?client_id=company_dev&state=aaaafffff-559d-4312-a8be-123412341234&redirect_uri=http%3A%2F%2Fcompany_landing.company.com%3A8081%2F%3Fauth_callback%3D1
If you observe the redirect uri above, I think the problem is that instead of https the redirect uri starts with http and http:/company-landing.company.com doesn't exist.
Settings:
keycloak settings: -
Realm --> settings --> login : Require SSL = all Requests (tried with "external" also)
Applications-->realm1-->settings-->Redirect URI = https://company_landing.company.com/*
AWS load balancer:
Port config: 443(https) forwarding to 8443
I am confused as to why it is stripping the SSL? The above works fine when testing on local environment(probably because its http://localhost) but this always gives an invalid redirect url when trying to access any link that is ssl encrypted.
-mm

Answer 1

You have to add the following property in the proxy configuration json file, (by default proxy.json) as an application attribute (same level as "adapter-config"):
"proxy-address-forwarding" : true,
This configuration attribute is not documented, however present in the sources of the proxy configuration: https://github.com/keycloak/keycloak/blob/master/proxy/proxy-server/src/main/java/org/keycloak/proxy/ProxyConfig.java

Answer 2

You don't need a certificate to be installed or use changes in adapter config.
This needs to be done in your standalone.xml, standalone-ha or domain.xml (as the case may be) as documented in the Keycloak document reverse proxy section https://www.keycloak.org/docs/latest/server_installation/index.html#_setting-up-a-load-balancer-or-proxy
Assuming that your reverse proxy doesn’t use port 8443 for SSL you also need to configure what port HTTPS traffic is redirected to.
<subsystem xmlns="urn:jboss:domain:undertow:4.0">
...
<http-listener name="default" socket-binding="http"
proxy-address-forwarding="true" redirect-socket="proxy-https"/>
...
</subsystem>
Add the redirect-socket attribute to the http-listener element. The value should be proxy-https which points to a socket binding you also need to define.
Then add a new socket-binding element to the socket-binding-group element:
<socket-binding-group name="standard-sockets" default-interface="public"
port-offset="${jboss.socket.binding.port-offset:0}">
...
<socket-binding name="proxy-https" port="443"/>
...
</socket-binding-group>