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/*
* Copyright (c) 2010 .SE (The Internet Infrastructure Foundation)
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/*****************************************************************************
getpw.cpp
Helper function to get a password from the user
*****************************************************************************/
#include <config.h>
#include "getpw.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef _WIN32
#include <windows.h>
#else
#include <unistd.h>
#include <termios.h>
#include <signal.h>
#endif
#ifndef _WIN32
// Remember the signal number
static volatile sig_atomic_t signo;
void sighandler(int s)
{
signo = s;
}
#endif
int getpin(const char* prompt, char* buffer, size_t size)
{
if (prompt == NULL || buffer == NULL || size < 1)
return -1;
printf("%s", prompt);
#ifdef _WIN32
HANDLE hstdin = GetStdHandle(STD_INPUT_HANDLE);
DWORD mode;
// Save current console mode
if (!GetConsoleMode(hstdin, &mode))
return -1;
// Update the console mode
if (hstdin == INVALID_HANDLE_VALUE || !(SetConsoleMode(hstdin, ENABLE_LINE_INPUT | ENABLE_PROCESSED_INPUT)))
return -1;
#else
struct termios new_attr, old_attr;
// Get current terminal attributes
if (tcgetattr(STDIN_FILENO, &old_attr) < 0)
return -1;
// Save the mode flags
new_attr = old_attr;
// Update the mode flags
new_attr.c_lflag &= ~ICANON;
new_attr.c_lflag &= ~ECHO;
// Handle the SIGINT signal
signo = 0;
struct sigaction osa, sa;
sigaction(SIGINT, NULL, &osa);
if (osa.sa_handler != SIG_IGN)
{
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sa.sa_handler = sighandler;
sigaction(SIGINT, &sa, &osa);
}
// Set the new terminal attributes
if (tcsetattr(STDIN_FILENO, 0, &new_attr) < 0)
return -1;
#endif
size_t nread = 0;
int ch = 0;
while ((ch = getchar()) != '\n' && ch != EOF)
{
// Check buffer size
if ((nread+2) > size)
continue;
putchar('*');
buffer[nread] = ch;
nread++;
}
putchar('\n');
buffer[nread] = '\0';
#ifdef _WIN32
// Restore the console mode
if (!SetConsoleMode(hstdin, mode))
return -1;
#else
// Restore terminal
if (tcsetattr(STDIN_FILENO, 0, &old_attr) < 0)
return -1;
// Restore the signal
sigaction(SIGINT, &osa, NULL);
if (signo)
raise(signo);
#endif
return nread;
}
// Get a password from the user
int getPW(char* pin, char* newPIN, CK_ULONG userType)
{
char password1[MAX_PIN_LEN+1];
char password2[MAX_PIN_LEN+1];
size_t size = MAX_PIN_LEN+1;
int length = 0;
// Check if the user has provided a password
if (pin)
{
length = strlen(pin);
// Save the PIN if it has the correct length
if (length >= MIN_PIN_LEN && length <= MAX_PIN_LEN)
memcpy(password1, pin, length+1);
}
while (length < MIN_PIN_LEN || length > MAX_PIN_LEN)
{
if (userType == CKU_SO)
{
printf("=== SO PIN (%i-%i characters) ===\n",
MIN_PIN_LEN, MAX_PIN_LEN);
length = getpin("Please enter SO PIN: ",
password1, size);
}
else
{
printf("=== User PIN (%i-%i characters) ===\n",
MIN_PIN_LEN, MAX_PIN_LEN);
length = getpin("Please enter user PIN: ",
password1, size);
}
if (length < 0)
return 1;
if (length < MIN_PIN_LEN || length > MAX_PIN_LEN)
{
fprintf(stderr, "ERROR: The length of the PIN is out of range.\n");
length = 0;
continue;
}
if (userType == CKU_SO)
{
length = getpin("Please reenter SO PIN: ",
password2, size);
}
else
{
length = getpin("Please reenter user PIN: ",
password2, size);
}
if (length < 0)
return 1;
if (strcmp(password1, password2))
{
fprintf(stderr, "ERROR: The entered PINs are not equal.\n");
length = 0;
continue;
}
}
memcpy(newPIN, password1, length+1);
return 0;
}
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