Modified keystore to ignore invalid key files inside the keystore dir…

…ectory to address #4681

* Has calls the validateName function before checking if we have the file
* List filters the returned list of file names by validateName.

License: MIT
Signed-off-by: matrushka <barisgumustas@gmail.com>

keystore/keystore.go

@@ -77,6 +77,10 @@ func (ks *FSKeystore) Has(name string) (bool, error) {
 		return false, err
 	}
 
+	if err := validateName(name); err != nil {
+		return false, err
+	}
+
 	return true, nil
 }
 
@@ -149,5 +153,19 @@ func (ks *FSKeystore) List() ([]string, error) {
 		return nil, err
 	}
 
-	return dir.Readdirnames(0)
+	dirs, err := dir.Readdirnames(0)
+	if err != nil {
+		return nil, err
+	}
+
+	var list []string
+
+	for _, name := range dirs {
+		err := validateName(name)
+		if err == nil {
+			list = append(list, name)
+		}
+	}
+
+	return list, err
 }

keystore/keystore_test.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"math/rand"
+	"path/filepath"
 	"sort"
 	"testing"
 
@@ -143,6 +144,62 @@ func TestKeystoreBasics(t *testing.T) {
 	}
 }
 
+func TestInvalidKeyFiles(t *testing.T) {
+	tdir, err := ioutil.TempDir("", "keystore-test")
+
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	ks, err := NewFSKeystore(tdir)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	key := privKeyOrFatal(t)
+
+	bytes, err := key.Bytes()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = ioutil.WriteFile(filepath.Join(ks.dir, "valid"), bytes, 0644)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = ioutil.WriteFile(filepath.Join(ks.dir, ".invalid"), bytes, 0644)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	l, err := ks.List()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	sort.Strings(l)
+	if len(l) != 1 {
+		t.Fatal("wrong entry count")
+	}
+
+	if l[0] != "valid" {
+		t.Fatal("wrong entries listed")
+	}
+
+	exist, err := ks.Has("valid")
+	if !exist {
+		t.Fatal("should know it has a key named valid")
+	}
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if exist, err = ks.Has(".invalid"); err == nil {
+		t.Fatal("shouldnt be able to put a key with a 'hidden' name")
+	}
+}
+
 func TestNonExistingKey(t *testing.T) {
 	tdir, err := ioutil.TempDir("", "keystore-test")
 	if err != nil {