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OIDC: case-insensitive comparison for auth scheme `Basic` (#31706) 

@kylef pointed out on https://github.com/go-gitea/gitea/pull/31632 that
[RFC7617](https://www.rfc-editor.org/rfc/rfc7617.html#section-2)
mandates case-insensitive comparison of the scheme field `Basic`. #31632
copied a case-sensitive comparison from
https://github.com/go-gitea/gitea/pull/6293. This PR fixes both
comparisons.

The issue only affects OIDC, since the implementation for normal Gitea
endpoints is already correct:


930ca92d7c/services/auth/basic.go (L55-L58)
This commit is contained in:
Shivaram Lingamneni 2024-07-26 21:51:45 +02:00 committed by GitHub
parent 4b376a0ed9
commit e1cf760d2f
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1 changed files with 2 additions and 2 deletions
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4
routers/web/auth/oauth.go
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@ -327,7 +327,7 @@ func getOAuthGroupsForUser(ctx go_context.Context, user *user_model.User) ([]str
func parseBasicAuth(ctx *context.Context) (username, password string, err error) {
authHeader := ctx.Req.Header.Get("Authorization")
if authType, authData, ok := strings.Cut(authHeader, " "); ok && authType == "Basic" {
if authType, authData, ok := strings.Cut(authHeader, " "); ok && strings.EqualFold(authType, "Basic") {
return base.BasicAuthDecode(authData)
}
return "", "", errors.New("invalid basic authentication")
@ -661,7 +661,7 @@ func AccessTokenOAuth(ctx *context.Context) {
// if there is no ClientID or ClientSecret in the request body, fill these fields by the Authorization header and ensure the provided field matches the Authorization header
if form.ClientID == "" || form.ClientSecret == "" {
authHeader := ctx.Req.Header.Get("Authorization")
if authType, authData, ok := strings.Cut(authHeader, " "); ok && authType == "Basic" {
if authType, authData, ok := strings.Cut(authHeader, " "); ok && strings.EqualFold(authType, "Basic") {
clientID, clientSecret, err := base.BasicAuthDecode(authData)
if err != nil {
handleAccessTokenError(ctx, AccessTokenError{