rbd: Add timeout for cryptsetup commands

This PR modifies the execCryptSetupCommand so that
the process is killed in an event of lock timeout.

Useful in cases where the volume lock is released but
the command is still running.

Signed-off-by: Niraj Yadav <niryadav@redhat.com>

internal/util/stripsecrets/stripsecrets.go

@@ -0,0 +1,85 @@
+/*
+Copyright 2019 The Ceph-CSI Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package stripsecrets
+
+import (
+	"strings"
+)
+
+const (
+	keyArg              = "--key="
+	keyFileArg          = "--keyfile="
+	secretArg           = "secret="
+	optionsArgSeparator = ','
+	strippedKey         = "--key=***stripped***"
+	strippedKeyFile     = "--keyfile=***stripped***"
+	strippedSecret      = "secret=***stripped***"
+)
+
+// InArgs strips values of either "--key"/"--keyfile" or "secret=".
+// `args` is left unchanged.
+// Expects only one occurrence of either "--key"/"--keyfile" or "secret=".
+func InArgs(args []string) []string {
+	out := make([]string, len(args))
+	copy(out, args)
+
+	if !stripKey(out) {
+		stripSecret(out)
+	}
+
+	return out
+}
+
+func stripKey(out []string) bool {
+	for i := range out {
+		if strings.HasPrefix(out[i], keyArg) {
+			out[i] = strippedKey
+
+			return true
+		}
+
+		if strings.HasPrefix(out[i], keyFileArg) {
+			out[i] = strippedKeyFile
+
+			return true
+		}
+	}
+
+	return false
+}
+
+func stripSecret(out []string) bool {
+	for i := range out {
+		arg := out[i]
+		begin := strings.Index(arg, secretArg)
+
+		if begin == -1 {
+			continue
+		}
+
+		end := strings.IndexByte(arg[begin+len(secretArg):], optionsArgSeparator)
+
+		out[i] = arg[:begin] + strippedSecret
+		if end != -1 {
+			out[i] += arg[end+len(secretArg):]
+		}
+
+		return true
+	}
+
+	return false
+}