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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| package handler | ||
|
|
||
| import ( | ||
| context "context" | ||
| "fmt" | ||
| "net/http" | ||
| "time" | ||
|
|
||
| "github.com/MicahParks/keyfunc" | ||
| "github.com/bufbuild/connect-go" | ||
| "github.com/golang-jwt/jwt/v4" | ||
| "github.com/sirupsen/logrus" | ||
|
|
||
| oidc "github.com/zitadel/oidc/pkg/client" | ||
| ) | ||
|
|
||
| func NewOIDCInterceptor(idp, audience string, allowedSubs []string) (connect.Interceptor, error) { | ||
| cfg, err := oidc.Discover(idp, &http.Client{Timeout: 10 * time.Second}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| jwks, err := keyfunc.Get(cfg.JwksURI, keyfunc.Options{ | ||
| Ctx: context.Background(), | ||
| RefreshErrorHandler: func(err error) { | ||
| logrus.WithError(err).WithField("identityProvider", idp).Warn("cannot refresh JWKS") | ||
| }, | ||
| RefreshInterval: time.Hour, | ||
| RefreshRateLimit: time.Minute * 5, | ||
| RefreshTimeout: time.Second * 10, | ||
| RefreshUnknownKID: true, | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| logrus.WithField("issuer", idp).WithField("audience", audience).WithField("sub", allowedSubs).Info("enabled OIDC authorisation") | ||
|
|
||
| return connect.UnaryInterceptorFunc(func(uf connect.UnaryFunc) connect.UnaryFunc { | ||
| return func(ctx context.Context, ar connect.AnyRequest) (connect.AnyResponse, error) { | ||
| rawToken := ar.Header().Get("Authorization") | ||
| if rawToken == "" { | ||
| return nil, connect.NewError(connect.CodeUnauthenticated, fmt.Errorf("missing Authorization header")) | ||
| } | ||
| token, err := jwt.Parse(rawToken, jwks.Keyfunc) | ||
| if err != nil { | ||
| return nil, connect.NewError(connect.CodeUnauthenticated, fmt.Errorf("cannot parse token: %w", err)) | ||
| } | ||
| if !token.Valid { | ||
| return nil, connect.NewError(connect.CodeUnauthenticated, fmt.Errorf("invalid JWT token")) | ||
| } | ||
| claims, ok := token.Claims.(jwt.MapClaims) | ||
| if !ok { | ||
| return nil, connect.NewError(connect.CodeUnauthenticated, fmt.Errorf("cannot extract claims from JWT")) | ||
| } | ||
| if !claims.VerifyAudience(audience, true) { | ||
| return nil, connect.NewError(connect.CodeUnauthenticated, fmt.Errorf("audience does not match (expected %s, got %s)", audience, claims["aud"])) | ||
| } | ||
| if !claims.VerifyIssuer(idp, true) { | ||
| return nil, connect.NewError(connect.CodeUnauthenticated, fmt.Errorf("issuer does not match (expected %s, got %s)", idp, claims["iss"])) | ||
| } | ||
| if !claims.VerifyExpiresAt(time.Now().Unix(), true) { | ||
| return nil, connect.NewError(connect.CodeUnauthenticated, fmt.Errorf("token has expired")) | ||
| } | ||
| var validSub bool | ||
| for _, sub := range allowedSubs { | ||
| if claims["sub"] == sub { | ||
| validSub = true | ||
| break | ||
| } | ||
| } | ||
| if !validSub { | ||
| return nil, connect.NewError(connect.CodeUnauthenticated, fmt.Errorf("unexpected subject %s", claims["sub"])) | ||
| } | ||
|
|
||
| return uf(ctx, ar) | ||
| } | ||
| }), nil | ||
| } |
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