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Prevent automatic OAuth grants for public clients (#30790) (#30836)

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Backport #30790 by archer-321

This commit forces the resource owner (user) to always approve OAuth 2.0
authorization requests if the client is public (e.g. native
applications).

As detailed in [RFC 6749 Section
10.2](https://www.rfc-editor.org/rfc/rfc6749.html#section-10.2),

> The authorization server SHOULD NOT process repeated authorization
requests automatically (without active resource owner interaction)
without authenticating the client or relying on other measures to ensure
that the repeated request comes from the original client and not an
impersonator.

With the implementation prior to this patch, attackers with access to
the redirect URI (e.g., the loopback interface for
`git-credential-oauth`) can get access to the user account without any
user interaction if they can redirect the user to the
`/login/oauth/authorize` endpoint somehow (e.g., with `xdg-open` on
Linux).

Fixes #25061.

Co-authored-by: Archer <archer@beezig.eu>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
(cherry picked from commit 6d83f5eddc0f394f6386e80b86a3221f6f4925ff)
This commit is contained in:
Giteabot 2024-05-03 03:06:32 +08:00 committed by Earl Warren
parent 5678e9ab20
commit 248a5b8d7a
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GPG key ID: 0579CB2928A78A00
1 changed files with 3 additions and 2 deletions
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5
routers/web/auth/oauth.go
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@ -469,8 +469,9 @@ func AuthorizeOAuth(ctx *context.Context) {
return
}
// Redirect if user already granted access
if grant != nil {
// Redirect if user already granted access and the application is confidential.
// I.e. always require authorization for public clients as recommended by RFC 6749 Section 10.2
if app.ConfidentialClient && grant != nil {
code, err := grant.GenerateNewAuthorizationCode(ctx, form.RedirectURI, form.CodeChallenge, form.CodeChallengeMethod)
if err != nil {
handleServerError(ctx, form.State, form.RedirectURI)