wownero/src/common/password.cpp
Riccardo Spagni 40980b33b7
Merge pull request #4550
0e33cf89 password: fix secure input with echo on windows (moneromooo-monero)
2018-10-15 13:25:50 +02:00

297 lines
7.7 KiB
C++

// Copyright (c) 2014-2018, 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.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
#include "memwipe.h"
#define EOT 0x4
namespace
{
#if defined(_WIN32)
bool is_cin_tty() noexcept
{
return 0 != _isatty(_fileno(stdin));
}
bool read_from_tty(epee::wipeable_string& pass, bool hide_input)
{
HANDLE h_cin = ::GetStdHandle(STD_INPUT_HANDLE);
DWORD mode_old;
::GetConsoleMode(h_cin, &mode_old);
DWORD mode_new = mode_old & ~(hide_input ? ENABLE_ECHO_INPUT : 0);
::SetConsoleMode(h_cin, mode_new);
bool r = true;
pass.reserve(tools::password_container::max_password_size);
std::vector<int> chlen;
chlen.reserve(tools::password_container::max_password_size);
while (pass.size() < tools::password_container::max_password_size)
{
DWORD read;
wchar_t ucs2_ch;
r = (TRUE == ::ReadConsoleW(h_cin, &ucs2_ch, 1, &read, NULL));
r &= (1 == read);
if (!r)
{
break;
}
else if (ucs2_ch == L'\r')
{
continue;
}
else if (ucs2_ch == L'\n')
{
std::cout << std::endl;
break;
}
else if (ucs2_ch == L'\b')
{
if (!pass.empty())
{
int len = chlen.back();
chlen.pop_back();
while(len-- > 0)
pass.pop_back();
}
continue;
}
char utf8_ch[8] = {0};
int len;
if((len = WideCharToMultiByte(CP_UTF8, 0, &ucs2_ch, 1, utf8_ch, sizeof(utf8_ch), NULL, NULL)) <= 0)
break;
if(pass.size() + len >= tools::password_container::max_password_size)
break;
chlen.push_back(len);
pass += utf8_ch;
}
::SetConsoleMode(h_cin, mode_old);
return r;
}
#else // end WIN32
bool is_cin_tty() noexcept
{
return 0 != isatty(fileno(stdin));
}
int getch(bool hide_input) noexcept
{
struct termios tty_old;
tcgetattr(STDIN_FILENO, &tty_old);
struct termios tty_new;
tty_new = tty_old;
tty_new.c_lflag &= ~(ICANON | (hide_input ? ECHO : 0));
tcsetattr(STDIN_FILENO, TCSANOW, &tty_new);
int ch = getchar();
tcsetattr(STDIN_FILENO, TCSANOW, &tty_old);
return ch;
}
bool read_from_tty(epee::wipeable_string& aPass, bool hide_input)
{
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(hide_input);
if (EOF == ch || ch == EOT)
{
return false;
}
else if (ch == '\n' || ch == '\r')
{
std::cout << std::endl;
break;
}
else if (ch == BACKSPACE)
{
if (!aPass.empty())
{
aPass.pop_back();
if (!hide_input)
std::cout << "\b\b\b \b\b\b" << std::flush;
}
else
{
if (!hide_input)
std::cout << "\b\b \b\b" << std::flush;
}
}
else
{
aPass.push_back(ch);
}
}
return true;
}
#endif // end !WIN32
bool read_from_tty(const bool verify, const char *message, bool hide_input, epee::wipeable_string& pass1, epee::wipeable_string& pass2)
{
while (true)
{
if (message)
std::cout << message <<": " << std::flush;
if (!read_from_tty(pass1, hide_input))
return false;
if (verify)
{
std::cout << "Confirm password: ";
if (!read_from_tty(pass2, hide_input))
return false;
if(pass1!=pass2)
{
std::cout << "Passwords do not match! Please try again." << std::endl;
pass1.clear();
pass2.clear();
}
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(epee::wipeable_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(const epee::wipeable_string& password) noexcept
: m_password(password)
{
}
password_container::~password_container() noexcept
{
m_password.clear();
}
std::atomic<bool> password_container::is_prompting(false);
boost::optional<password_container> password_container::prompt(const bool verify, const char *message, bool hide_input)
{
is_prompting = true;
password_container pass1{};
password_container pass2{};
if (is_cin_tty() ? read_from_tty(verify, message, hide_input, pass1.m_password, pass2.m_password) : read_from_file(pass1.m_password))
{
is_prompting = false;
return {std::move(pass1)};
}
is_prompting = false;
return boost::none;
}
boost::optional<login> login::parse(std::string&& userpass, bool verify, const std::function<boost::optional<password_container>(bool)> &prompt)
{
login out{};
const auto loc = userpass.find(':');
if (loc == std::string::npos)
{
auto result = prompt(verify);
if (!result)
return boost::none;
out.password = std::move(*result);
}
else
{
out.password = password_container{userpass.substr(loc + 1)};
}
out.username = userpass.substr(0, loc);
password_container wipe{std::move(userpass)};
return {std::move(out)};
}
}