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// Copyright 2013-2015 Apcera Inc. All rights reserved.
package test
import (
"net/http"
"github.com/apcera/gssapi"
"github.com/apcera/gssapi/spnego"
)
func HandleAccess(c *Context, w http.ResponseWriter, r *http.Request) (code int, message string) {
ctx, code, message := allowed(c, w, r)
if ctx == nil {
return code, message
}
w.Write([]byte("OK"))
return http.StatusOK, "OK"
}
// 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"
}
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