From 21c9b0e6b039e9765eb414c406c2b86e8cea6850 Mon Sep 17 00:00:00 2001
From: komels <komels@yandex-team.ru>
Date: Thu, 14 Apr 2022 13:10:53 +0300
Subject: Final part on compatibility layer: LOGBROKER-7215
ref:777c67aadbf705d19034a09a792b2df61ba53697
---
.../string_utils/secret_string/secret_string.cpp | 68 ++++++++++++++++++++++
1 file changed, 68 insertions(+)
create mode 100644 library/cpp/string_utils/secret_string/secret_string.cpp
(limited to 'library/cpp/string_utils/secret_string/secret_string.cpp')
diff --git a/library/cpp/string_utils/secret_string/secret_string.cpp b/library/cpp/string_utils/secret_string/secret_string.cpp
new file mode 100644
index 0000000000..3b68d3cd27
--- /dev/null
+++ b/library/cpp/string_utils/secret_string/secret_string.cpp
@@ -0,0 +1,68 @@
+#include "secret_string.h"
+
+#include <util/system/madvise.h>
+
+namespace NSecretString {
+ TSecretString::TSecretString(TStringBuf value) {
+ Init(value);
+ }
+
+ TSecretString::~TSecretString() {
+ try {
+ Clear();
+ } catch (...) {
+ }
+ }
+
+ TSecretString& TSecretString::operator=(const TSecretString& o) {
+ if (&o == this) {
+ return *this;
+ }
+
+ Init(o.Value_);
+
+ return *this;
+ }
+
+ /**
+ * It is not honest "move". Actually it is copy-assignment with cleaning of other instance.
+ * This way allowes to avoid side effects of string optimizations:
+ * Copy-On-Write or Short-String-Optimization
+ */
+ TSecretString& TSecretString::operator=(TSecretString&& o) {
+ if (&o == this) {
+ return *this;
+ }
+
+ Init(o.Value_);
+ o.Clear();
+
+ return *this;
+ }
+
+ TSecretString& TSecretString::operator=(const TStringBuf o) {
+ Init(o);
+
+ return *this;
+ }
+
+ void TSecretString::Init(TStringBuf value) {
+ Clear();
+ if (value.empty()) {
+ return;
+ }
+
+ Value_ = value;
+ MadviseExcludeFromCoreDump(Value_);
+ }
+
+ void TSecretString::Clear() {
+ if (Value_.empty()) {
+ return;
+ }
+
+ SecureZero((void*)Value_.data(), Value_.size());
+ MadviseIncludeIntoCoreDump(Value_);
+ Value_.clear();
+ }
+}
--
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