| 1 | /* $Id: HashedPw.cpp 57358 2015-08-14 15:16:38Z vboxsync $ */
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| 2 | /** @file
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| 3 | * Main - Password Hashing
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2012 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 |
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| 19 | /*********************************************************************************************************************************
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| 20 | * Header Files *
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| 21 | *********************************************************************************************************************************/
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| 22 | #include "HashedPw.h"
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| 23 |
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| 24 | #include <iprt/assert.h>
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| 25 | #include <iprt/ctype.h>
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| 26 | #include <iprt/sha.h>
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| 27 | #include <iprt/string.h>
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| 28 |
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| 29 |
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| 30 | /*********************************************************************************************************************************
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| 31 | * Global Variables *
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| 32 | *********************************************************************************************************************************/
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| 33 | /**
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| 34 | * The prefix of a hashed password.
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| 35 | */
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| 36 | static const char s_szHashedPwPrefix[] = "#SHA-512#";
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| 37 |
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| 38 |
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| 39 | /**
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| 40 | * Checks if the password is a hashed one or not.
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| 41 | *
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| 42 | * Empty password are not considered hashed.
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| 43 | *
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| 44 | * @returns true if hashed, false if not.
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| 45 | * @param a_pstrPassword Password to inspect.
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| 46 | */
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| 47 | bool VBoxIsPasswordHashed(RTCString const *a_pstrPassword)
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| 48 | {
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| 49 | /* prefix */
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| 50 | if (!a_pstrPassword->startsWith(s_szHashedPwPrefix))
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| 51 | return false;
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| 52 |
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| 53 | /* salt (optional) */
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| 54 | const char *pszSalt = a_pstrPassword->c_str() + sizeof(s_szHashedPwPrefix) - 1;
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| 55 | const char *pszSaltEnd = strchr(pszSalt, '#');
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| 56 | if (!pszSaltEnd)
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| 57 | return false;
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| 58 | while (pszSalt != pszSaltEnd)
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| 59 | {
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| 60 | if (!RT_C_IS_XDIGIT(*pszSalt))
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| 61 | return false;
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| 62 | pszSalt++;
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| 63 | }
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| 64 |
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| 65 | /* hash */
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| 66 | uint8_t abHash[RTSHA512_HASH_SIZE];
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| 67 | int rc = RTSha512FromString(pszSaltEnd + 1, abHash);
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| 68 | return RT_SUCCESS(rc);
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| 69 | }
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| 70 |
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| 71 |
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| 72 | /**
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| 73 | * Hashes a plain text password.
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| 74 | *
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| 75 | * @param a_pstrPassword Plain text password to hash. This is both
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| 76 | * input and output.
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| 77 | */
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| 78 | void VBoxHashPassword(RTCString *a_pstrPassword)
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| 79 | {
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| 80 | AssertReturnVoid(!VBoxIsPasswordHashed(a_pstrPassword));
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| 81 |
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| 82 | char szHashedPw[sizeof(s_szHashedPwPrefix) + 1 + RTSHA512_DIGEST_LEN];
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| 83 | if (a_pstrPassword->isEmpty())
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| 84 | szHashedPw[0] = '\0';
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| 85 | else
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| 86 | {
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| 87 | /* prefix */
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| 88 | char *pszHashedPw = szHashedPw;
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| 89 | strcpy(pszHashedPw, s_szHashedPwPrefix);
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| 90 | pszHashedPw += sizeof(s_szHashedPwPrefix) - 1;
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| 91 |
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| 92 | /* salt */
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| 93 | *pszHashedPw++ = '#'; /* no salt yet */
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| 94 |
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| 95 | /* hash */
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| 96 | uint8_t abHash[RTSHA512_HASH_SIZE];
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| 97 | RTSha512(a_pstrPassword->c_str(), a_pstrPassword->length(), abHash);
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| 98 | int rc = RTSha512ToString(abHash, pszHashedPw, sizeof(szHashedPw) - (pszHashedPw - &szHashedPw[0]));
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| 99 | AssertReleaseRC(rc);
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| 100 | }
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| 101 |
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| 102 | *a_pstrPassword = szHashedPw;
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| 103 | }
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| 104 |
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