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/* $Id: HashedPw.cpp $ */
/** @file
* Main - Password Hashing
*/
/*
* Copyright (C) 2012-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "HashedPw.h"
#include <iprt/assert.h>
#include <iprt/ctype.h>
#include <iprt/sha.h>
#include <iprt/string.h>
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
/**
* The prefix of a hashed password.
*/
static const char s_szHashedPwPrefix[] = "#SHA-512#";
/**
* Checks if the password is a hashed one or not.
*
* Empty password are not considered hashed.
*
* @returns true if hashed, false if not.
* @param a_pstrPassword Password to inspect.
*/
bool VBoxIsPasswordHashed(RTCString const *a_pstrPassword)
{
/* prefix */
if (!a_pstrPassword->startsWith(s_szHashedPwPrefix))
return false;
/* salt (optional) */
const char *pszSalt = a_pstrPassword->c_str() + sizeof(s_szHashedPwPrefix) - 1;
const char *pszSaltEnd = strchr(pszSalt, '#');
if (!pszSaltEnd)
return false;
while (pszSalt != pszSaltEnd)
{
if (!RT_C_IS_XDIGIT(*pszSalt))
return false;
pszSalt++;
}
/* hash */
uint8_t abHash[RTSHA512_HASH_SIZE];
int vrc = RTSha512FromString(pszSaltEnd + 1, abHash);
return RT_SUCCESS(vrc);
}
/**
* Hashes a plain text password.
*
* @param a_pstrPassword Plain text password to hash. This is both
* input and output.
*/
void VBoxHashPassword(RTCString *a_pstrPassword)
{
AssertReturnVoid(!VBoxIsPasswordHashed(a_pstrPassword));
char szHashedPw[sizeof(s_szHashedPwPrefix) + 1 + RTSHA512_DIGEST_LEN];
if (a_pstrPassword->isEmpty())
szHashedPw[0] = '\0';
else
{
/* prefix */
char *pszHashedPw = szHashedPw;
strcpy(pszHashedPw, s_szHashedPwPrefix);
pszHashedPw += sizeof(s_szHashedPwPrefix) - 1;
/* salt */
*pszHashedPw++ = '#'; /* no salt yet */
/* hash */
uint8_t abHash[RTSHA512_HASH_SIZE];
RTSha512(a_pstrPassword->c_str(), a_pstrPassword->length(), abHash);
int vrc = RTSha512ToString(abHash, pszHashedPw, sizeof(szHashedPw) - (size_t)(pszHashedPw - &szHashedPw[0]));
AssertReleaseRC(vrc);
}
*a_pstrPassword = szHashedPw;
}
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