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gitlab omniauth + oauth2 report "You need to sign in or sign up before continuing."

Summary

I am configuring my Gitlab instance with Omniauth to use a Keycloak server as an Oauth2 provider after inputing username/pwd on keycloak and redirect back to gitlab. the git lab UI show "You need to sign in or sign up before continuing."

Steps to reproduce

  1. edit the gitlab.rb
 gitlab_rails['omniauth_allow_single_sign_on'] = ['saml','oauth2']
 gitlab_rails['omniauth_block_auto_created_users'] = false
 {
     'name' => 'oauth2',
     'app_id' => 'gitlab_oauth',
     'app_secret' => '82a3292f-0715-4728-a0bb-36f7a988e47a',
     'args' => {
             'client_options': {
                'site' => 'https://keycloak.willy.com:8443',
                'user_info_url' => '/auth/realms/pangu/protocol/openid-connect/userinfo',
                'authorize_url' => '/auth/realms/pangu/protocol/openid-connect/auth',
                'token' => '/auth/realms/test/protocol/openid-connect/token'
                },
             'user_response_structure':{
                attribue: { nickname: 'preferred_username'},
                id_path:'preferred_username'
                },
             'name': 'oauth',
             'strategy_class': 'OmniAuth::Strategies::OAuth2Generic',
             'redirect_url': 'https://gitlab.willy.com/users/auth/oauth2_generic/callback'
                        }

   }
  1. I can see the oauth button on the index. click it, the page will redirect to keycloak
  2. input user credential on keycloak. click login
  3. the web will redirect back to gitlab
  4. UI show: You need to sign in or sign up before continuing.
  5. the production log:
Redirected to https://gitlab.willy.com/users/sign_in
Filter chain halted as :redirect_unlogged_user rendered or redirected
Completed 302 Found in 27ms (ActiveRecord: 0.7ms | Elasticsearch: 0.0ms)
Started GET "/users/sign_in" for 172.16.106.91 at 2020-01-14 10:37:08 +0000
Processing by SessionsController#new as HTML
Completed 200 OK in 647ms (Views: 275.4ms | ActiveRecord: 17.4ms | Elasticsearch: 0.0ms)
Started POST "/users/auth/oauth" for 172.16.106.91 at 2020-01-14 10:37:13 +0000
Processing by Gitlab::RequestForgeryProtection::Controller#index as HTML
  Parameters: {"authenticity_token"=>"[FILTERED]"}
Completed 200 OK in 1ms (ActiveRecord: 0.0ms | Elasticsearch: 0.0ms)
Started GET "/-/metrics" for 127.0.0.1 at 2020-01-14 10:37:17 +0000
Processing by MetricsController#index as HTML
Completed 200 OK in 6ms (Views: 0.4ms | ActiveRecord: 0.0ms | Elasticsearch: 0.0ms)
Started GET "/users/auth/oauth2_generic/callback?state=d5834a26d8c58d1d68a0e193e885c6919c632ddb7b974e06&session_state=767c9018-8f8d-4bf6-a8d0-64546e3b308c&code=[FILTERED]" for 172.16.106.91 at 2020-01-14 10:37:20 +0000
Processing by ApplicationController#route_not_found as HTML
  Parameters: {"state"=>"d5834a26d8c58d1d68a0e193e885c6919c632ddb7b974e06", "session_state"=>"767c9018-8f8d-4bf6-a8d0-64546e3b308c", "code"=>"[FILTERED]", "unmatched_route"=>"users/auth/oauth2_generic/callback"}
Redirected to https://gitlab.willy.com/users/sign_in
Completed 302 Found in 270ms (ActiveRecord: 0.0ms | Elasticsearch: 0.0ms)
Started GET "/users/sign_in" for 172.16.106.91 at 2020-01-14 10:37:20 +0000
Processing by SessionsController#new as HTML
Completed 200 OK in 29ms (Views: 19.5ms | ActiveRecord: 1.3ms | Elasticsearch: 0.0ms)

What is the current bug behavior?

UI show: You need to sign in or sign up before continuing. the production log:

Redirected to https://gitlab.willy.com/users/sign_in
Filter chain halted as :redirect_unlogged_user rendered or redirected
Completed 302 Found in 27ms (ActiveRecord: 0.7ms | Elasticsearch: 0.0ms)
Started GET "/users/sign_in" for 172.16.106.91 at 2020-01-14 10:37:08 +0000
Processing by SessionsController#new as HTML
Completed 200 OK in 647ms (Views: 275.4ms | ActiveRecord: 17.4ms | Elasticsearch: 0.0ms)
Started POST "/users/auth/oauth" for 172.16.106.91 at 2020-01-14 10:37:13 +0000
Processing by Gitlab::RequestForgeryProtection::Controller#index as HTML
  Parameters: {"authenticity_token"=>"[FILTERED]"}
Completed 200 OK in 1ms (ActiveRecord: 0.0ms | Elasticsearch: 0.0ms)
Started GET "/-/metrics" for 127.0.0.1 at 2020-01-14 10:37:17 +0000
Processing by MetricsController#index as HTML
Completed 200 OK in 6ms (Views: 0.4ms | ActiveRecord: 0.0ms | Elasticsearch: 0.0ms)
Started GET "/users/auth/oauth2_generic/callback?state=d5834a26d8c58d1d68a0e193e885c6919c632ddb7b974e06&session_state=767c9018-8f8d-4bf6-a8d0-64546e3b308c&code=[FILTERED]" for 172.16.106.91 at 2020-01-14 10:37:20 +0000
Processing by ApplicationController#route_not_found as HTML
  Parameters: {"state"=>"d5834a26d8c58d1d68a0e193e885c6919c632ddb7b974e06", "session_state"=>"767c9018-8f8d-4bf6-a8d0-64546e3b308c", "code"=>"[FILTERED]", "unmatched_route"=>"users/auth/oauth2_generic/callback"}
Redirected to https://gitlab.willy.com/users/sign_in
Completed 302 Found in 270ms (ActiveRecord: 0.0ms | Elasticsearch: 0.0ms)
Started GET "/users/sign_in" for 172.16.106.91 at 2020-01-14 10:37:20 +0000
Processing by SessionsController#new as HTML
Completed 200 OK in 29ms (Views: 19.5ms | ActiveRecord: 1.3ms | Elasticsearch: 0.0ms)

What is the expected correct behavior?

gitlab login with keycloak account

Results of GitLab environment info

Expand for output related to GitLab environment info 
System information
System:
Proxy:          no
Current User:   git
Using RVM:      no
Ruby Version:   2.6.3p62
Gem Version:    2.7.9
Bundler Version:1.17.3
Rake Version:   12.3.3
Redis Version:  3.2.12
Git Version:    2.24.1
Sidekiq Version:5.2.7
Go Version:     unknown

GitLab information
Version:        12.6.3-ee
Revision:       461e0ee8310
Directory:      /opt/gitlab/embedded/service/gitlab-rails
DB Adapter:     PostgreSQL
DB Version:     10.9
URL:            https://gitlab.willy.com
HTTP Clone URL: https://gitlab.willy.com/some-group/some-project.git
SSH Clone URL:  git@gitlab.willy.com:some-group/some-project.git
Elasticsearch:  no
Geo:            no
Using LDAP:     no
Using Omniauth: yes
Omniauth Providers: openid_connect, oauth2


GitLab Shell
Version:        10.3.0
Repository storage paths:
  • default: /var/opt/gitlab/git-data/repositories GitLab Shell path: /opt/gitlab/embedded/service/gitlab-shell Git: /opt/gitlab/embedded/bin/git

Results of GitLab application Check

Expand for output related to the GitLab application check 
Checking GitLab subtasks ...

Checking GitLab Shell ...


GitLab Shell: ... GitLab Shell version >= 10.3.0 ? ... OK (10.3.0)
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Internal API available: OK
Redis available via internal API: OK
gitlab-shell self-check successful


Checking GitLab Shell ... Finished


Checking Gitaly ...


Gitaly: ... default ... OK


Checking Gitaly ... Finished


Checking Sidekiq ...


Sidekiq: ... Running? ... yes
Number of Sidekiq processes ... 1


Checking Sidekiq ... Finished


Checking Incoming Email ...


Incoming Email: ... Reply by email is disabled in config/gitlab.yml


Checking Incoming Email ... Finished


Checking LDAP ...


LDAP: ... LDAP is disabled in config/gitlab.yml


Checking LDAP ... Finished


Checking GitLab App ...


Git configured correctly? ... yes
Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... skipped (no tmp uploads folder yet)
Init script exists? ... skipped (omnibus-gitlab has no init script)
Init script up-to-date? ... skipped (omnibus-gitlab has no init script)
Projects have namespace: ... can't check, you have no projects
Redis version >= 2.8.0? ... yes
Ruby version >= 2.5.3 ? ... yes (2.6.3)
Git version >= 2.22.0 ? ... yes (2.24.1)
Git user has default SSH configuration? ... yes
Active users: ... 2
Is authorized keys file accessible? ... yes
Elasticsearch version 5.6 - 6.x? ... skipped (elasticsearch is disabled)


Checking GitLab App ... Finished


Checking GitLab subtasks ... Finished

~bug /lable

Edited by 🤖 GitLab Bot 🤖