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The code introduced by #18185 gets the error from response after it was processed by goth. That is incorrect, as goth (and golang.org/x/oauth) doesn't really care about the error, and it sends a token request with an empty authorization code to the server anyway, which always results in a `oauth2: cannot fetch token: 400 Bad Request` error from goth. It means that unless the "state" parameter is omitted from the error response (which is required to be present, according to [RFC 6749, Section 4.1.2.1](https://datatracker.ietf.org/doc/html/rfc6749#section-4.1.2.1)) or the page is reloaded (makes the session invalid), a 500 Internal Server Error page will be displayed. This fixes it by handling the error before the request is passed to goth.
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1 changed files with 20 additions and 12 deletions
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@ -37,6 +37,7 @@ import (
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"gitea.com/go-chi/binding"
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"github.com/golang-jwt/jwt/v4"
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"github.com/markbates/goth"
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"github.com/markbates/goth/gothic"
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)
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const (
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@ -1098,24 +1099,31 @@ func handleOAuth2SignIn(ctx *context.Context, source *auth.Source, u *user_model
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func oAuth2UserLoginCallback(authSource *auth.Source, request *http.Request, response http.ResponseWriter) (*user_model.User, goth.User, error) {
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oauth2Source := authSource.Cfg.(*oauth2.Source)
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// Make sure that the response is not an error response.
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errorName := request.FormValue("error")
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if len(errorName) > 0 {
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errorDescription := request.FormValue("error_description")
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// Delete the goth session
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err := gothic.Logout(response, request)
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if err != nil {
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return nil, goth.User{}, err
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}
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return nil, goth.User{}, errCallback{
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Code: errorName,
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Description: errorDescription,
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}
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}
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// Proceed to authenticate through goth.
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gothUser, err := oauth2Source.Callback(request, response)
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if err != nil {
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if err.Error() == "securecookie: the value is too long" || strings.Contains(err.Error(), "Data too long") {
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log.Error("OAuth2 Provider %s returned too long a token. Current max: %d. Either increase the [OAuth2] MAX_TOKEN_LENGTH or reduce the information returned from the OAuth2 provider", authSource.Name, setting.OAuth2.MaxTokenLength)
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err = fmt.Errorf("OAuth2 Provider %s returned too long a token. Current max: %d. Either increase the [OAuth2] MAX_TOKEN_LENGTH or reduce the information returned from the OAuth2 provider", authSource.Name, setting.OAuth2.MaxTokenLength)
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}
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// goth does not provide the original error message
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// https://github.com/markbates/goth/issues/348
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if strings.Contains(err.Error(), "server response missing access_token") || strings.Contains(err.Error(), "could not find a matching session for this request") {
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errorCode := request.FormValue("error")
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errorDescription := request.FormValue("error_description")
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if errorCode != "" || errorDescription != "" {
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return nil, goth.User{}, errCallback{
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Code: errorCode,
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Description: errorDescription,
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}
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}
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}
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return nil, goth.User{}, err
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}
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