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fix: PKCE only for supported providers

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This commit is contained in:
oliverpool 2024-06-10 10:09:35 +02:00
parent 985939c145
commit 7d6a0bced9
2 changed files with 20 additions and 3 deletions
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2
release-notes/8.0.0/feat/3307.md
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@ -1 +1 @@
Support [Proof Key for Code Exchange (PKCE - RFC7636)](https://www.rfc-editor.org/rfc/rfc7636) for external login sources using the OAuth2 flow.
Support [Proof Key for Code Exchange (PKCE - RFC7636)](https://www.rfc-editor.org/rfc/rfc7636) for external login using the OpenID Connect authentication source.

21
routers/web/auth/oauth.go
View file

@ -44,6 +44,9 @@ import (
"github.com/golang-jwt/jwt/v5"
"github.com/markbates/goth"
"github.com/markbates/goth/gothic"
"github.com/markbates/goth/providers/fitbit"
"github.com/markbates/goth/providers/openidConnect"
"github.com/markbates/goth/providers/zoom"
go_oauth2 "golang.org/x/oauth2"
)
@ -888,7 +891,7 @@ func SignInOAuth(ctx *context.Context) {
return
}
codeChallenge, err := generateCodeChallenge(ctx)
codeChallenge, err := generateCodeChallenge(ctx, provider)
if err != nil {
ctx.ServerError("SignIn", fmt.Errorf("could not generate code_challenge: %w", err))
return
@ -1238,7 +1241,21 @@ func handleOAuth2SignIn(ctx *context.Context, source *auth.Source, u *user_model
}
// generateCodeChallenge stores a code verifier in the session and returns a S256 code challenge for PKCE
func generateCodeChallenge(ctx *context.Context) (codeChallenge string, err error) {
func generateCodeChallenge(ctx *context.Context, provider string) (codeChallenge string, err error) {
// the `code_verifier` is only forwarded by specific providers
// https://codeberg.org/forgejo/forgejo/issues/4033
p, ok := goth.GetProviders()[provider]
if !ok {
return "", nil
}
switch p.(type) {
default:
return "", nil
case *openidConnect.Provider, *fitbit.Provider, *zoom.Provider:
// those providers forward the `code_verifier`
// a code_challenge can be generated
}
codeVerifier, err := util.CryptoRandomString(43) // 256/log2(62) = 256 bits of entropy (each char having log2(62) of randomness)
if err != nil {
return "", err