mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-23 08:00:20 +00:00
50 lines
1.4 KiB
C++
50 lines
1.4 KiB
C++
/*
|
|
* Copyright (c) 2021, Brian Gianforcaro <bgianf@serenityos.org>
|
|
* Copyright (c) 2021, Mustafa Quraish <mustafa@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/Memory.h>
|
|
#include <LibCore/SecretString.h>
|
|
|
|
namespace Core {
|
|
|
|
ErrorOr<SecretString> SecretString::take_ownership(char*& cstring, size_t length)
|
|
{
|
|
auto buffer = TRY(ByteBuffer::copy(cstring, length));
|
|
|
|
secure_zero(cstring, length);
|
|
free(cstring);
|
|
cstring = nullptr;
|
|
|
|
return SecretString(move(buffer));
|
|
}
|
|
|
|
SecretString SecretString::take_ownership(ByteBuffer&& buffer)
|
|
{
|
|
return SecretString(move(buffer));
|
|
}
|
|
|
|
SecretString::SecretString(ByteBuffer&& buffer)
|
|
: m_secure_buffer(move(buffer))
|
|
{
|
|
// SecretString is currently only used to provide the character data to invocations to crypt(),
|
|
// which requires a NUL-terminated string. To ensure this operation avoids a buffer overrun,
|
|
// append a NUL terminator here if there isn't already one.
|
|
if (m_secure_buffer.is_empty() || (m_secure_buffer[m_secure_buffer.size() - 1] != 0)) {
|
|
u8 nul = '\0';
|
|
m_secure_buffer.append(&nul, 1);
|
|
}
|
|
}
|
|
|
|
SecretString::~SecretString()
|
|
{
|
|
// Note: We use secure_zero to avoid the zeroing from being optimized out by the compiler,
|
|
// which is possible if memset was to be used here.
|
|
if (!m_secure_buffer.is_empty()) {
|
|
secure_zero(m_secure_buffer.data(), m_secure_buffer.capacity());
|
|
}
|
|
}
|
|
|
|
}
|