monero/src/wallet/password_container.cpp
2016-12-19 20:00:43 -05:00

249 lines
6.3 KiB
C++

// Copyright (c) 2014-2016, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
#include "password_container.h"
#include <iostream>
#include <memory.h>
#include <stdio.h>
#if defined(_WIN32)
#include <io.h>
#include <windows.h>
#else
#include <termios.h>
#include <unistd.h>
#endif
namespace
{
#if defined(_WIN32)
bool is_cin_tty() noexcept
{
return 0 != _isatty(_fileno(stdin));
}
bool read_from_tty(std::string& pass)
{
static constexpr const char BACKSPACE = 8;
HANDLE h_cin = ::GetStdHandle(STD_INPUT_HANDLE);
DWORD mode_old;
::GetConsoleMode(h_cin, &mode_old);
DWORD mode_new = mode_old & ~(ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT);
::SetConsoleMode(h_cin, mode_new);
bool r = true;
pass.reserve(tools::password_container::max_password_size);
while (pass.size() < tools::password_container::max_password_size)
{
DWORD read;
char ch;
r = (TRUE == ::ReadConsoleA(h_cin, &ch, 1, &read, NULL));
r &= (1 == read);
if (!r)
{
break;
}
else if (ch == '\n' || ch == '\r')
{
std::cout << std::endl;
break;
}
else if (ch == BACKSPACE)
{
if (!pass.empty())
{
pass.back() = '\0';
pass.resize(pass.size() - 1);
std::cout << "\b \b";
}
}
else
{
pass.push_back(ch);
std::cout << '*';
}
}
::SetConsoleMode(h_cin, mode_old);
return r;
}
#else // end WIN32
bool is_cin_tty() noexcept
{
return 0 != isatty(fileno(stdin));
}
int getch() noexcept
{
struct termios tty_old;
tcgetattr(STDIN_FILENO, &tty_old);
struct termios tty_new;
tty_new = tty_old;
tty_new.c_lflag &= ~(ICANON | ECHO);
tcsetattr(STDIN_FILENO, TCSANOW, &tty_new);
int ch = getchar();
tcsetattr(STDIN_FILENO, TCSANOW, &tty_old);
return ch;
}
bool read_from_tty(std::string& aPass)
{
static constexpr const char BACKSPACE = 127;
aPass.reserve(tools::password_container::max_password_size);
while (aPass.size() < tools::password_container::max_password_size)
{
int ch = getch();
if (EOF == ch)
{
return false;
}
else if (ch == '\n' || ch == '\r')
{
std::cout << std::endl;
break;
}
else if (ch == BACKSPACE)
{
if (!aPass.empty())
{
aPass.back() = '\0';
aPass.resize(aPass.size() - 1);
std::cout << "\b \b";
}
}
else
{
aPass.push_back(ch);
std::cout << '*';
}
}
return true;
}
#endif // end !WIN32
void clear(std::string& pass) noexcept
{
//! TODO Call a memory wipe function that hopefully is not optimized out
pass.replace(0, pass.capacity(), pass.capacity(), '\0');
pass.clear();
}
bool read_from_tty(const bool verify, const char *message, std::string& pass1, std::string& pass2)
{
while (true)
{
if (message)
std::cout << message <<": ";
if (!read_from_tty(pass1))
return false;
if (verify)
{
std::cout << "Confirm Password: ";
if (!read_from_tty(pass2))
return false;
if(pass1!=pass2)
{
std::cout << "Passwords do not match! Please try again." << std::endl;
clear(pass1);
clear(pass2);
}
else //new password matches
return true;
}
else
return true;
//No need to verify password entered at this point in the code
}
return false;
}
bool read_from_file(std::string& pass)
{
pass.reserve(tools::password_container::max_password_size);
for (size_t i = 0; i < tools::password_container::max_password_size; ++i)
{
char ch = static_cast<char>(std::cin.get());
if (std::cin.eof() || ch == '\n' || ch == '\r')
{
break;
}
else if (std::cin.fail())
{
return false;
}
else
{
pass.push_back(ch);
}
}
return true;
}
} // anonymous namespace
namespace tools
{
// deleted via private member
password_container::password_container() noexcept : m_password() {}
password_container::password_container(std::string&& password) noexcept
: m_password(std::move(password))
{
}
password_container::~password_container() noexcept
{
clear(m_password);
}
boost::optional<password_container> password_container::prompt(const bool verify, const char *message)
{
password_container pass1{};
password_container pass2{};
if (is_cin_tty() ? read_from_tty(verify, message, pass1.m_password, pass2.m_password) : read_from_file(pass1.m_password))
return {std::move(pass1)};
return boost::none;
}
}