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After pressing Gitlab button redirected to main login page #106

Description

@totkapf

Describe the bug
After pressing the Gitlab button you redirected to https://mattermost.example.com/oauth/resource.php and then immideatly to https://mattermost.integranw.ru/login?redirect_to=%2Foauth%2Fresource.php

To Reproduce
Steps to reproduce the behavior:

  1. Install mattermost Team Edition v.7.9.2
  2. Install Mattermost-LDAP on the same server as Bare metal (Apache/2.4.37 port 443 over SSL, PHP 7.2.24)
  3. Open mattermost login page, click gitlab, redirected to https://mattermost.example.com/oauth/resource.php and then immideatly to https://mattermost.integranw.ru/login?redirect_to=%2Foauth%2Fresource.php

Provide commands, Mattermost and PHP logs or configuration file if possible.
192.168.100.21 -- mattermost server
192.168.100.10 --nginx web-proxy server for access mattermost server from outside
OS: Rocky Linux 8

Mattermost logs in debug mode

{"timestamp":"2023-04-28 14:44:15.240 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"GET","url":"/oauth/gitlab/login","request_id":"3jiziwtcmffc3e7u73p6metagy","status_code":"302"}
{"timestamp":"2023-04-28 14:44:15.299 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"GET","url":"/oauth/resource.php/oauth/authorize","request_id":"ek39sb7b6tdg3dyd1r36p9mkyc","status_code":"200"}
{"timestamp":"2023-04-28 14:44:15.934 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"GET","url":"/api/v4/config/client","request_id":"r3hg4c95ntyypnipqq9mfd6ymw","status_code":"200"}
{"timestamp":"2023-04-28 14:44:15.936 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"GET","url":"/api/v4/license/client","request_id":"6ayfhhxuwfnrfrhzfnazfnfthr","status_code":"200"}
{"timestamp":"2023-04-28 14:44:15.959 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"GET","url":"/api/v4/plugins/webapp","request_id":"8jrw615x8f8iby766j8wi1x6qy","status_code":"200"}
{"timestamp":"2023-04-28 14:44:16.323 +03:00","level":"debug","msg":"Received HTTP request","caller":"app/plugin_api.go:970","plugin_id":"playbooks","method":"GET","url":"/api/v0/settings","user_id":"","request_id":"64r1p1mw5bdqtfbi486em8zqny","user_agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/111.0","plugin_caller":"github.com/mattermost/mattermost-plugin-playbooks/server/api/logger.go:44"}
{"timestamp":"2023-04-28 14:44:16.325 +03:00","level":"debug","msg":"Handled HTTP request","caller":"app/plugin_api.go:970","plugin_id":"playbooks","method":"GET","url":"/api/v0/settings","user_id":"","request_id":"64r1p1mw5bdqtfbi486em8zqny","user_agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/111.0","time":"2","status":"401","plugin_caller":"github.com/mattermost/mattermost-plugin-playbooks/server/api/logger.go:57"}
{"timestamp":"2023-04-28 14:44:16.615 +03:00","level":"debug","msg":"Invalid or expired session, please login again.","caller":"web/context.go:113","path":"/api/v4/teams","request_id":"9wjnjm8983fh7geoemexectsbh","ip_addr":"192.168.100.10","user_id":"","method":"GET","err_where":"","http_code":401,"error":": Invalid or expired session, please login again., UserRequired"}
{"timestamp":"2023-04-28 14:44:16.615 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"GET","url":"/api/v4/teams","request_id":"9wjnjm8983fh7geoemexectsbh","status_code":"401"}
{"timestamp":"2023-04-28 14:44:16.645 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"POST","url":"/api/v4/users/logout","request_id":"j6n6xkorn3833f8g6qnjpj4qsr","status_code":"200"}
{"timestamp":"2023-04-28 14:44:16.667 +03:00","level":"debug","msg":"Invalid or expired session, please login again.","caller":"web/context.go:113","path":"/api/v4/teams","request_id":"1sjzaa5u5ibttr86cfjiwho3me","ip_addr":"192.168.100.10","user_id":"","method":"GET","err_where":"","http_code":401,"error":": Invalid or expired session, please login again., UserRequired"}
{"timestamp":"2023-04-28 14:44:16.667 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"GET","url":"/api/v4/teams","request_id":"1sjzaa5u5ibttr86cfjiwho3me","status_code":"401"}
{"timestamp":"2023-04-28 14:44:16.693 +03:00","level":"debug","msg":"websocket.NextReader: closing websocket","caller":"platform/web_conn.go:828","user_id":"","error":"websocket: close 1006 (abnormal closure): unexpected EOF"}
{"timestamp":"2023-04-28 14:44:16.693 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"GET","url":"/api/v4/websocket","request_id":"gs8xojgctf8apb3itf9tq1dxta"}
{"timestamp":"2023-04-28 14:44:16.695 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"GET","url":"/","request_id":"83iju8omkpbj3f9yh9y1yd333y","status_code":"200"}
{"timestamp":"2023-04-28 14:44:16.716 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"POST","url":"/api/v4/users/logout","request_id":"nnfgsxqekjnot8pcz6g5qdin5h","status_code":"200"}
{"timestamp":"2023-04-28 14:44:16.781 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"POST","url":"/api/v4/users/logout","request_id":"tsp55qjqjtfjpdff4hkk1kb6yw","status_code":"200"}
{"timestamp":"2023-04-28 14:44:16.851 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"GET","url":"/","request_id":"muhimtxbwir4fcwrt3wwnm9bqw","status_code":"200"}
{"timestamp":"2023-04-28 14:44:16.940 +03:00","level":"debug","msg":"Invalid or expired session, please login again.","caller":"web/context.go:113","path":"/api/v4/teams","request_id":"fxpjym4wntfnxdf9hw7y1tnoww","ip_addr":"192.168.100.10","user_id":"","method":"GET","err_where":"","http_code":401,"error":": Invalid or expired session, please login again., UserRequired"}
{"timestamp":"2023-04-28 14:44:16.940 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"GET","url":"/api/v4/teams","request_id":"fxpjym4wntfnxdf9hw7y1tnoww","status_code":"401"}
{"timestamp":"2023-04-28 14:44:18.063 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"GET","url":"/api/v4/config/client","request_id":"pu5a7wccciy6ur1rqs8aikdr7e","status_code":"200"}
{"timestamp":"2023-04-28 14:44:18.064 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"GET","url":"/api/v4/license/client","request_id":"cf9y18jti7yibku315c13ropha","status_code":"200"}
{"timestamp":"2023-04-28 14:44:18.104 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"GET","url":"/api/v4/plugins/webapp","request_id":"t9xpnud3rfb7mbqzdrg5cbew3e","status_code":"200"}
{"timestamp":"2023-04-28 14:44:18.328 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"GET","url":"/api/v4/config/client","request_id":"6z7wasqxxjb47k5fzcbn84imih","status_code":"200"}
{"timestamp":"2023-04-28 14:44:18.332 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"GET","url":"/api/v4/license/client","request_id":"eaxkhk5iniyg5yxu49a6g5t9ah","status_code":"200"}
{"timestamp":"2023-04-28 14:44:18.405 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"GET","url":"/api/v4/plugins/webapp","request_id":"ciwyfympwty8iffqt9y1yje5jh","status_code":"200"}
{"timestamp":"2023-04-28 14:44:18.538 +03:00","level":"debug","msg":"Received HTTP request","caller":"app/plugin_api.go:970","plugin_id":"playbooks","user_id":"","request_id":"sqxeho9mzfgczmk3jtn1zuua9y","user_agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/111.0","method":"GET","url":"/api/v0/settings","plugin_caller":"github.com/mattermost/mattermost-plugin-playbooks/server/api/logger.go:44"}
{"timestamp":"2023-04-28 14:44:18.539 +03:00","level":"debug","msg":"Handled HTTP request","caller":"app/plugin_api.go:970","plugin_id":"playbooks","method":"GET","time":"1","status":"401","url":"/api/v0/settings","user_id":"","request_id":"sqxeho9mzfgczmk3jtn1zuua9y","user_agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/111.0","plugin_caller":"github.com/mattermost/mattermost-plugin-playbooks/server/api/logger.go:57"}
{"timestamp":"2023-04-28 14:44:18.874 +03:00","level":"debug","msg":"Invalid or expired session, please login again.","caller":"web/context.go:113","path":"/api/v4/teams","request_id":"fm3kxfhzmjngmxnnewiawk673o","ip_addr":"192.168.100.10","user_id":"","method":"GET","err_where":"","http_code":401,"error":": Invalid or expired session, please login again., UserRequired"}
{"timestamp":"2023-04-28 14:44:18.874 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"GET","url":"/api/v4/teams","request_id":"fm3kxfhzmjngmxnnewiawk673o","status_code":"401"}
{"timestamp":"2023-04-28 14:44:18.995 +03:00","level":"debug","msg":"Received HTTP request","caller":"app/plugin_api.go:970","plugin_id":"playbooks","method":"GET","url":"/api/v0/settings","user_id":"","request_id":"rbft5obi978pimradox9gf5tgy","user_agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/111.0","plugin_caller":"github.com/mattermost/mattermost-plugin-playbooks/server/api/logger.go:44"}
{"timestamp":"2023-04-28 14:44:18.996 +03:00","level":"debug","msg":"Handled HTTP request","caller":"app/plugin_api.go:970","plugin_id":"playbooks","time":"1","status":"401","user_agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/111.0","method":"GET","url":"/api/v0/settings","user_id":"","request_id":"rbft5obi978pimradox9gf5tgy","plugin_caller":"github.com/mattermost/mattermost-plugin-playbooks/server/api/logger.go:57"}
{"timestamp":"2023-04-28 14:44:19.230 +03:00","level":"debug","msg":"Invalid or expired session, please login again.","caller":"web/context.go:113","path":"/api/v4/teams","request_id":"3x58oezx87de3przmik7nouzec","ip_addr":"192.168.100.10","user_id":"","method":"GET","err_where":"","http_code":401,"error":": Invalid or expired session, please login again., UserRequired"}
{"timestamp":"2023-04-28 14:44:19.230 +03:00","level":"debug","msg":"Received HTTP request","caller":"web/handlers.go:171","method":"GET","url":"/api/v4/teams","request_id":"3x58oezx87de3przmik7nouzec","status_code":"401"}

Mattermost config

"GitLabSettings": {
    "Enable": true,
    "Secret": "<secret>",
    "Id": "<id>",
    "Scope": "",
    "AuthEndpoint": "https://mattermost.example.com/oauth/resource.php/oauth/authorize",
    "TokenEndpoint": "https://mattermost.example.com/oauth/resource.php/oauth/token",
    "UserAPIEndpoint": "https://mattermost.example.com/oauth/resource.php/api/v4/user",
    "DiscoveryEndpoint": "",
    "ButtonText": "",
    "ButtonColor": ""

ldap.php output

<h3>LDAP : Test Center</h3>Attempting to connect LDAP server ... <br />Successful connection ! <br />Authenticating with bind credentials ... <br />Successful authentication ! <br />Getting user informations ...<br />Data recovered with success ! <br />Extracting useful data : <br /><br />dn: uid=user,cn=users,cn=accounts,dc=example,dc=com<br />cn: user user<br />uid: user<br />email: user@example.com<br /><hr />Closing LDAP connection.

Expected behavior
Redirection to Gitlab authentification page

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