// Attempt to obtain the loader key from the file system and override the
// built-in secret
func loadLoaderKey() error {
fd, err := os.Open(getLoaderKeyfile())
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
defer fd.Close()
buf, _, err := bufio.NewReader(fd).ReadLine()
if err != nil {
// Nothing in the loader key file
if err == io.EOF {
return nil
}
return err
}
// Also trim any leading and trailing spaces from the loader key
LOADERKEY = strings.Trim(string(buf), " ")
err = mig.ValidateLoaderPrefixAndKey(LOADERKEY)
if err != nil {
return err
}
ctx.LoaderKey = LOADERKEY
return nil
}
func hashAuthenticateLoader(lkey string) (ldr mig.LoaderEntry, err error) {
err = mig.ValidateLoaderPrefixAndKey(lkey)
if err != nil {
return
}
prefix := lkey[:mig.LoaderPrefixLength]
suppkey := lkey[mig.LoaderPrefixLength:]
lad, err := ctx.DB.GetLoaderAuthDetails(prefix)
if err != nil {
return
}
tryhash, _, err := hashLoaderKey(suppkey, lad.Salt)
if err != nil {
return
}
if !bytes.Equal(tryhash, lad.Hash) {
err = fmt.Errorf("Loader key authentication failed")
return
}
ldr, err = ctx.DB.GetLoaderFromID(lad.ID)
return
}
// authenticateLoader is used to authenticate requests that are made to the
// loader API endpoints. Rather than operate on GPG signatures, the
// authentication instead uses the submitted loader key
func authenticateLoader(pass handler) handler {
return func(w http.ResponseWriter, r *http.Request) {
var (
err error
ldr mig.LoaderEntry
)
opid := getOpID(r)
context.Set(r, opID, opid)
context.Set(r, apiRequestCategory, RequestCategoryLoader)
lkey := r.Header.Get("X-LOADERKEY")
if lkey == "" {
resource := cljs.New(fmt.Sprintf("%s%s", ctx.Server.Host, r.URL.String()))
resource.SetError(cljs.Error{Code: fmt.Sprintf("%.0f", opid), Message: "X-LOADERKEY header not found"})
respond(http.StatusUnauthorized, resource, w, r)
return
}
err = mig.ValidateLoaderPrefixAndKey(lkey)
if err != nil {
goto authfailed
}
ldr, err = hashAuthenticateLoader(lkey)
if err != nil {
goto authfailed
}
context.Set(r, loaderID, ldr.ID)
context.Set(r, loaderName, ldr.Name)
// accept request
pass(w, r)
return
authfailed:
context.Set(r, loaderName, "authfailed")
resource := cljs.New(fmt.Sprintf("%s%s", ctx.Server.Host, r.URL.String()))
resource.SetError(cljs.Error{Code: fmt.Sprintf("%.0f", opid), Message: fmt.Sprintf("Loader authorization failed")})
respond(http.StatusUnauthorized, resource, w, r)
}
}