Require id_token_hint to be an ID token at the logout endpoint - #4992
Require id_token_hint to be an ID token at the logout endpoint#4992Thareesha98 wants to merge 1 commit into
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📝 WalkthroughWalkthroughThe logout resolver now requires ChangesLogout hint validation
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The logout endpoint now rejects access tokens and other non-ID-token hints, preventing them from suppressing the sign-out confirmation. The change is otherwise mergeable, but the required documentation for this public behavior change still needs explicit owner follow-up. Possibly related PRs
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docs/content/guides/protocols/oauth-oidc/rp-initiated-logout.mdxESLint skipped: missing config or dependency (missing-dependency). The ESLint configuration references a package that is not available in the sandbox. Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out. Comment |
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Inline comments:
In `@backend/internal/oauth/oauth2/logout/service.go`:
- Around line 224-253: Update the OAuth2 logout API documentation in apis.mdx to
describe id_token_hint validation for /oauth2/logout: accept ID tokens only and
reject access tokens, ID-JAG assertions, and refresh tokens.
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backend/internal/oauth/oauth2/logout/service.gobackend/internal/oauth/oauth2/logout/service_test.gotests/integration/oauth/sso/logout_negative_test.go
GET/POST /oauth2/logout accepted any server-signed JWT as id_token_hint. The
hint was checked for signature and issuer and then read for its audience, with
nothing constraining the token type. An access token issued to an application
with no configured defaultAudience carries aud=client_id, because
ResolveDefaultAudience falls back to the client id, so it satisfied both checks
and resolved a client. Expiry is deliberately not enforced for id_token_hint per
OIDC RP-Initiated Logout, so an expired access token was accepted too.
Supplying a hint suppresses the End-User sign-out confirmation, which is the
mitigation for forced logout through cross-site navigation, so any holder of an
access token for the target client could suppress it.
Identify the token the way ValidateIDJAGSubjectToken already does when it makes
the same decision for subject_token: require the ID token typ header, which
access tokens ("at+jwt", RFC 9068) and ID-JAG assertions ("oauth-id-jag+jwt") do
not carry, and reject the access_token_sub claim that marks a refresh token.
The RP-initiated logout guide listed the hint checks as signature and issuer and
enumerated the reasons a request is rejected, so both now cover the token type.
Fixes thunder-id#4990
Signed-off-by: Thareesha98 <thareesha98@gmail.com>
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Purpose
Fixes #4990.
GET/POST /oauth2/logoutaccepted any server-signed JWT asid_token_hint.clientIDFromIDTokenHintchecked the signature and the issuer and then went straight to the audience, so nothing constrained the token type. An access token issued to an application with no configureddefaultAudiencecarriesaud=client_id(ResolveDefaultAudiencefalls back to the client id), so it satisfied both checks and resolved a client. Expiry is deliberately not enforced forid_token_hintper OIDC RP-Initiated Logout, so an expired access token was accepted as well.Because supplying a hint suppresses the End-User sign-out confirmation, any holder of an access token for the target client could suppress it.
Approach
The codebase already answers "is this an ID token" in
tokenservice.ValidateIDJAGSubjectToken, which makes the same decision forsubject_token. I mirrored it rather than inventing a second rule:typheader. Access tokens are typedat+jwt(RFC 9068) and ID-JAG assertionsoauth-id-jag+jwt, so this rejects both.access_token_subclaim, which marks a refresh token. Refresh tokens share the ID tokentyp, so the header alone does not separate them.Both failures return the existing
errInvalidIDTokenHint, so the response is unchanged and the endpoint does not reveal which check refused the token.Refresh tokens were already unreachable in practice, since their
audis the issuer rather than a client id and so resolved no client a step later. I rejected them explicitly anyway, because that is what the existing ID token check does and relying on a downstream accident is fragile.Related Issues
Related PRs
Validation
go test ./internal/oauth/...: 25 packages passgolangci-lint run ./internal/oauth/...: 0 issuesmockeryfrom both configs produces no diff, since no interface changedUnit tests cover an access token, an ID-JAG assertion, a refresh token, a missing
typand an undecodable header. The integration test inlogout_negative_test.gouses a real access token from a real login, with theid_tokenfrom that same login as the control, so the rejection is shown to be about the token type rather than the session, client or issuer.Checklist
breaking changelabel added.Security checks
Summary by CodeRabbit
Bug Fixes
invalid id_token_hinterror.Documentation
id_token_hintparameter.Tests