## Describe your changes
`isValidAccessToken` only decodes the JWT payload and checks the
audience
claim, but its name suggested full token validation. Rename it to
`validateTokenAudience` and document what it does: a client-side
audience/shape
check on a token just obtained from the IdP over TLS. Token authenticity
is
enforced server-side by the management server, which verifies the
signature
against the IdP's JWKS (`shared/auth/jwt/validator.go`) on every
request.
Also harden the parser: a non-empty token lacking the three-part JWT
structure
caused an index-out-of-range panic (`strings.Split(token, ".")[1]`); the
shape
is now validated first. `parseEmailFromIDToken` is documented as
best-effort UX
data (login hint/display), never used for authorization. Added tests for
audience matching, malformed tokens, and the panic regression.
Changes:
- Rename `isValidAccessToken` → `validateTokenAudience`; document that
it does
not verify the signature and that authenticity is enforced server-side.
- Fix an index-out-of-range panic on a non-empty token lacking JWT
structure
(`strings.Split(token, ".")[1]`) by validating the three-part shape
first.
- Document `parseEmailFromIDToken` as best-effort/unverified, used only
for the
login-hint/display UX, never for an authorization decision.
- Add `util_test.go` covering audience matching (string and array),
missing
audience, malformed payloads, and the panic regression.
## Issue ticket number and link
Internal cleanup: rename a misleadingly-named client-side helper and
harden JWT
parsing against malformed input (`client/internal/auth/util.go`).
## Stack
- `0.74.7-branch` - ⚠️ No PR associated with branch <!--
branch-stack -->
- \#6806 :point\_left:
### Checklist
- [x] Is it a bug fix
- [ ] Is a typo/documentation fix
- [ ] Is a feature enhancement
- [ ] It is a refactor
- [x] Created tests that fail without the change (if possible)
> By submitting this pull request, you confirm that you have read and
agree to the terms of the [Contributor License
Agreement](https://github.com/netbirdio/netbird/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT.md).
## Documentation
Select exactly one:
- [ ] I added/updated documentation for this change
- [x] Documentation is **not needed** for this change (explain why)
Internal client-side helper rename plus a panic hardening fix. No public
API,
gRPC, CLI/service flag, or configuration change; token authenticity
enforcement
(server-side JWKS verification) is unchanged.
### Docs PR URL (required if "docs added" is checked)
Paste the PR link from <https://github.com/netbirdio/docs> here:
N/A
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<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **Bug Fixes**
- Improved access-token audience validation during device and PKCE
authentication flows.
- Malformed tokens now return clear validation errors instead of risking
runtime failures.
- Added support for validating both string and array audience claims.
- **Tests**
- Added coverage for malformed tokens, invalid claims, missing
audiences, and panic prevention.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Users reported long delays between finishing browser authentication and
the client connecting. Logs could not attribute the time: the PKCE and
device flows were silent between issuing the auth URL and returning the
token, and nothing recorded when the GUI issued the Up request after
WaitSSOLogin completed.
Add log lines covering the full chain: PKCE callback arrival and token
exchange duration, device-flow polling and approval timing, GUI-side
brackets around WaitSSOLogin and Up, daemon-side Up arrival and
WaitSSOLogin return, and a frontend stall detector that reports when
webview timers were suspended (macOS App Nap / hidden-window
throttling), which delays the WaitSSOLogin-to-Up handoff.
Remove client secret from gRPC auth flow. The secret was originally included to support providers like Google Workspace that don't offer a proper PKCE flow, but this is no longer necessary with the embedded IdP. Deployments using such providers should migrate to the embedded IdP instead.
* Consolidate authentication logic
- Moving auth functions from client/internal to client/internal/auth package
- Creating unified auth.Auth client with NewAuth() constructor
- Replacing direct auth function calls with auth client methods
- Refactoring device flow and PKCE flow implementations
- Updating iOS/Android/server code to use new auth client API
* Refactor PKCE auth and login methods
- Remove unnecessary internal package reference in PKCE flow test
- Adjust context assignment placement in iOS and Android login methods
* Add gocritic linter
`gocritic` provides diagnostics that check for bugs, performance, and style issues
We disable the following checks:
- commentFormatting
- captLocal
- deprecatedComment
This PR contains many `//nolint:gocritic` to disable `appendAssign`.
Enhance the user experience by enabling authentication to Netbird using Single Sign-On (SSO) with any Identity Provider (IDP) provider. Current client offers this capability through the Device Authorization Flow, however, is not widely supported by many IDPs, and even some that do support it do not provide a complete verification URL.
To address these challenges, this pull request enable Authorization Code Flow with Proof Key for Code Exchange (PKCE) for client logins, which is a more widely adopted and secure approach to facilitate SSO with various IDP providers.
