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