// allowed implements the SPNEGO protocol. When the request is to be passed
// through, it returns http.StatusOK and a valid gssapi CtxId object.
// Otherwise, it sets the WWW-Authorization header as applicable, and returns
// http.StatusUnathorized.
func allowed(c *Context, w http.ResponseWriter, r *http.Request) (
ctx *gssapi.CtxId, code int, message string) {
// returning a 401 with a challenge, but no token will make the client
// initiate security context and re-submit with a non-empty Authorization
negotiate, inputToken := spnego.CheckSPNEGONegotiate(c.Lib, r.Header, "Authorization")
if !negotiate || inputToken.Length() == 0 {
spnego.AddSPNEGONegotiate(w.Header(), "WWW-Authenticate", nil)
return nil, http.StatusUnauthorized, "no input token provided"
}
ctx, srcName, _, outputToken, _, _, delegatedCredHandle, err :=
c.AcceptSecContext(c.GSS_C_NO_CONTEXT,
c.credential, inputToken, c.GSS_C_NO_CHANNEL_BINDINGS)
//TODO: special case handling of GSS_S_CONTINUE_NEEDED
// but it doesn't change the logic, still fail
if err != nil {
//TODO: differentiate invalid tokens here and return a 403
//TODO: add a test for a bad and maybe an expired auth tokens
return nil, http.StatusInternalServerError, err.Error()
}
srcName.Release()
delegatedCredHandle.Release()
spnego.AddSPNEGONegotiate(w.Header(), "WWW-Authenticate", outputToken)
return ctx, http.StatusOK, "pass"
}
func initClientContext(t *testing.T, method, path string,
bodyf func(ctx *gssapi.CtxId) string) (
ctx *gssapi.CtxId, r *http.Request) {
// establish a context
ctx, _, token, _, _, err := c.InitSecContext(
c.GSS_C_NO_CREDENTIAL,
nil,
prepareServiceName(t),
c.GSS_C_NO_OID,
0,
0,
c.GSS_C_NO_CHANNEL_BINDINGS,
c.GSS_C_NO_BUFFER)
defer token.Release()
if err != nil {
e, ok := err.(*gssapi.Error)
if ok && e.Major.ContinueNeeded() {
t.Fatal("Unexpected GSS_S_CONTINUE_NEEDED")
}
t.Fatal(err)
}
u := c.ServiceAddress + path
if !strings.HasPrefix(u, "http://") {
u = "http://" + u
}
body := io.Reader(nil)
if bodyf != nil {
body = bytes.NewBufferString(bodyf(ctx))
}
r, err = http.NewRequest(method, u, body)
if err != nil {
t.Fatal(err)
}
spnego.AddSPNEGONegotiate(r.Header, "Authorization", token)
return ctx, r
}