From 191a74d62254ca00be2ccdf7e3afe69c0f9d6c12 Mon Sep 17 00:00:00 2001 From: M Hickford Date: Mon, 24 Oct 2022 09:59:24 +0200 Subject: Record OAuth client type at registration (#21316) The OAuth spec [defines two types of client](https://datatracker.ietf.org/doc/html/rfc6749#section-2.1), confidential and public. Previously Gitea assumed all clients to be confidential. > OAuth defines two client types, based on their ability to authenticate securely with the authorization server (i.e., ability to > maintain the confidentiality of their client credentials): > > confidential > Clients capable of maintaining the confidentiality of their credentials (e.g., client implemented on a secure server with > restricted access to the client credentials), or capable of secure client authentication using other means. > > **public > Clients incapable of maintaining the confidentiality of their credentials (e.g., clients executing on the device used by the resource owner, such as an installed native application or a web browser-based application), and incapable of secure client authentication via any other means.** > > The client type designation is based on the authorization server's definition of secure authentication and its acceptable exposure levels of client credentials. The authorization server SHOULD NOT make assumptions about the client type. https://datatracker.ietf.org/doc/html/rfc8252#section-8.4 > Authorization servers MUST record the client type in the client registration details in order to identify and process requests accordingly. Require PKCE for public clients: https://datatracker.ietf.org/doc/html/rfc8252#section-8.1 > Authorization servers SHOULD reject authorization requests from native apps that don't use PKCE by returning an error message Fixes #21299 Co-authored-by: wxiaoguang Co-authored-by: Lunny Xiao --- routers/web/auth/oauth.go | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) (limited to 'routers/web/auth') diff --git a/routers/web/auth/oauth.go b/routers/web/auth/oauth.go index c98385c8f6..9c929d990e 100644 --- a/routers/web/auth/oauth.go +++ b/routers/web/auth/oauth.go @@ -438,8 +438,21 @@ func AuthorizeOAuth(ctx *context.Context) { log.Error("Unable to save changes to the session: %v", err) } case "": - break + // "Authorization servers SHOULD reject authorization requests from native apps that don't use PKCE by returning an error message" + // https://datatracker.ietf.org/doc/html/rfc8252#section-8.1 + if !app.ConfidentialClient { + // "the authorization endpoint MUST return the authorization error response with the "error" value set to "invalid_request"" + // https://datatracker.ietf.org/doc/html/rfc7636#section-4.4.1 + handleAuthorizeError(ctx, AuthorizeError{ + ErrorCode: ErrorCodeInvalidRequest, + ErrorDescription: "PKCE is required for public clients", + State: form.State, + }, form.RedirectURI) + return + } default: + // "If the server supporting PKCE does not support the requested transformation, the authorization endpoint MUST return the authorization error response with "error" value set to "invalid_request"." + // https://www.rfc-editor.org/rfc/rfc7636#section-4.4.1 handleAuthorizeError(ctx, AuthorizeError{ ErrorCode: ErrorCodeInvalidRequest, ErrorDescription: "unsupported code challenge method", -- cgit v1.2.3