[PR #6669] [management] Trim trailing slash from Keycloak AdminEndpoint #26609

New Issue

saavagebueno · 2026-08-05T07:07:34-04:00

saavagebueno commented

2026-08-05 07:07:34 -04:00

📋 Pull Request Information

Original PR: https://github.com/netbirdio/netbird/pull/6669
Author: @Tarasusrus
Created: 7/4/2026
Status: 🔄 Open

Base: main ← Head: fix/keycloak-admin-endpoint-trailing-slash

📝 Commits (1)

a940cbb [management] Trim trailing slash from Keycloak AdminEndpoint

📊 Changes

2 files changed (+67 additions, -1 deletions)

View changed files

📝 management/server/idp/keycloak.go (+1 -1)
➕ management/server/idp/keycloak_url_test.go (+66 -0)

📄 Description

Summary

A trailing slash in the configured Keycloak AdminEndpoint produced a double slash in admin API request paths, e.g. https://<host>/admin/realms/<realm>//users/count?.
Keycloak >= 26.4.3 requires normalised admin API request paths and rejects the double slash with a 400, which breaks dashboard login and VPN client authentication entirely (see #4979).
Root cause: management/server/idp/keycloak.go builds request URLs with fmt.Sprintf("%s/%s", km.adminEndpoint, resource) in two call sites (get, DeleteUser); if the configured endpoint already ends in /, this yields //.
Fix: normalize once at construction time in NewKeycloakManager (strings.TrimRight(config.AdminEndpoint, "/")) instead of patching every call site individually.

Fixes #4979.

Test plan

Added TestKeycloakManager_AdminEndpointTrailingSlash (red before the fix, green after) asserting the built request URL never contains //users when AdminEndpoint has a trailing slash
go test ./management/server/idp/... passes (full package, no regressions)
golangci-lint run ./management/server/idp/... clean
gofmt clean

🤖 Generated with Claude Code

Summary by CodeRabbit

Bug Fixes
- Fixed an issue where admin API requests could be built with an extra slash when the server URL ended in /.
- Improved URL handling so management calls use a normalized base path and avoid malformed requests.
Tests
- Added coverage for admin endpoint URLs with trailing slashes to prevent regressions.

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

## 📋 Pull Request Information **Original PR:** https://github.com/netbirdio/netbird/pull/6669 **Author:** [@Tarasusrus](https://github.com/Tarasusrus) **Created:** 7/4/2026 **Status:** 🔄 Open **Base:** `main` ← **Head:** `fix/keycloak-admin-endpoint-trailing-slash` --- ### 📝 Commits (1) - [`a940cbb`](https://github.com/netbirdio/netbird/commit/a940cbbb3fe3aa2e6ec660a86be0beaddbba6dbc) [management] Trim trailing slash from Keycloak AdminEndpoint ### 📊 Changes **2 files changed** (+67 additions, -1 deletions) <details> <summary>View changed files</summary> 📝 `management/server/idp/keycloak.go` (+1 -1) ➕ `management/server/idp/keycloak_url_test.go` (+66 -0) </details> ### 📄 Description ## Summary - A trailing slash in the configured Keycloak `AdminEndpoint` produced a double slash in admin API request paths, e.g. `https://<host>/admin/realms/<realm>//users/count?`. - Keycloak >= 26.4.3 requires normalised admin API request paths and rejects the double slash with a 400, which breaks dashboard login and VPN client authentication entirely (see #4979). - Root cause: `management/server/idp/keycloak.go` builds request URLs with `fmt.Sprintf("%s/%s", km.adminEndpoint, resource)` in two call sites (`get`, `DeleteUser`); if the configured endpoint already ends in `/`, this yields `//`. - Fix: normalize once at construction time in `NewKeycloakManager` (`strings.TrimRight(config.AdminEndpoint, "/")`) instead of patching every call site individually. Fixes #4979. ## Test plan - [x] Added `TestKeycloakManager_AdminEndpointTrailingSlash` (red before the fix, green after) asserting the built request URL never contains `//users` when `AdminEndpoint` has a trailing slash - [x] `go test ./management/server/idp/...` passes (full package, no regressions) - [x] `golangci-lint run ./management/server/idp/...` clean - [x] `gofmt` clean 🤖 Generated with [Claude Code](https://claude.com/claude-code)  ## Summary by CodeRabbit * **Bug Fixes** * Fixed an issue where admin API requests could be built with an extra slash when the server URL ended in `/`. * Improved URL handling so management calls use a normalized base path and avoid malformed requests. * **Tests** * Added coverage for admin endpoint URLs with trailing slashes to prevent regressions.  --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>

saavagebueno added the pull-request label 2026-08-05 07:07:34 -04:00

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Reference: DYNR/netbird#26609