| 1 | /* $Id: shacrypt.cpp 102567 2023-12-11 09:51:35Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Crypto - SHA-crypt.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #include "internal/iprt.h"
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| 42 | #include <iprt/crypto/shacrypt.h>
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| 43 |
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| 44 | #include <iprt/mem.h>
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| 45 | #include <iprt/rand.h>
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| 46 | #include <iprt/sha.h>
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| 47 | #include <iprt/string.h>
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| 48 |
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| 49 |
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| 50 | /*********************************************************************************************************************************
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| 51 | * Defined Constants And Macros *
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| 52 | *********************************************************************************************************************************/
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| 53 | /*
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| 54 | * The SHACRYPT_MINIMAL option reduces the .text + .rdata size in a Windows release
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| 55 | * build from 6956 to 4592 bytes by not unrolling the not-base64 encoding and instead
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| 56 | * using common code w/ a mapping table.
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| 57 | */
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| 58 | #define SHACRYPT_MINIMAL /* don't unroll the digest -> characters conversion */
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| 59 |
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| 60 | /**
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| 61 | * Encode a byte triplet into four characters (or less), base64-style.
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| 62 | *
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| 63 | * @note This differs from base64 in that it is LSB oriented,
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| 64 | * so where base64 will use bits[7:2] from the first byte for the first
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| 65 | * char, this will use bits [5:0].
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| 66 | *
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| 67 | * The character set is also different.
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| 68 | */
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| 69 | #define NOT_BASE64_ENCODE(a_psz, a_off, a_bVal2, a_bVal1, a_bVal0, a_cOutputChars) \
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| 70 | do { \
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| 71 | uint32_t uWord = RT_MAKE_U32_FROM_MSB_U8(0, a_bVal2, a_bVal1, a_bVal0); \
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| 72 | a_psz[(a_off)++] = g_achCryptBase64[uWord & 0x3f]; \
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| 73 | if ((a_cOutputChars) > 1) \
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| 74 | { \
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| 75 | uWord >>= 6; \
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| 76 | a_psz[(a_off)++] = g_achCryptBase64[uWord & 0x3f]; \
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| 77 | } \
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| 78 | if ((a_cOutputChars) > 2) \
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| 79 | { \
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| 80 | uWord >>= 6; \
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| 81 | a_psz[(a_off)++] = g_achCryptBase64[uWord & 0x3f]; \
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| 82 | } \
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| 83 | if ((a_cOutputChars) > 3) \
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| 84 | { \
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| 85 | uWord >>= 6; \
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| 86 | a_psz[(a_off)++] = g_achCryptBase64[uWord & 0x3f]; \
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| 87 | } \
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| 88 | } while (0)
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| 89 |
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| 90 |
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| 91 | /*********************************************************************************************************************************
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| 92 | * Global Variables *
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| 93 | *********************************************************************************************************************************/
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| 94 | /** This is the non-standard base64 encoding characters used by SHA-crypt and friends. */
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| 95 | static const char g_achCryptBase64[] = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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| 96 | AssertCompile(sizeof(g_achCryptBase64) == 64 + 1);
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| 97 |
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| 98 |
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| 99 | #ifdef SHACRYPT_MINIMAL
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| 100 | /**
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| 101 | * Common "base64" encoding function used by RTCrShaCrypt256ToString and
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| 102 | * RTCrShaCrypt512ToString in minimal mode.
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| 103 | */
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| 104 | static size_t rtCrShaCryptDigestToChars(char *pszString, size_t off, uint8_t const *pabHash, size_t cbHash,
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| 105 | uint8_t const *pabMapping)
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| 106 | {
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| 107 | /* full triplets first: */
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| 108 | uintptr_t idx = 0;
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| 109 | while (idx + 3 <= cbHash)
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| 110 | {
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| 111 | NOT_BASE64_ENCODE(pszString, off,
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| 112 | pabHash[pabMapping[idx + 2]],
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| 113 | pabHash[pabMapping[idx + 1]],
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| 114 | pabHash[pabMapping[idx + 0]], 4);
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| 115 | idx += 3;
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| 116 | }
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| 117 |
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| 118 | /* Anything remaining: Either 1 or 2, never zero. */
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| 119 | switch (cbHash - idx)
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| 120 | {
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| 121 | case 1:
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| 122 | NOT_BASE64_ENCODE(pszString, off,
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| 123 | 0,
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| 124 | 0,
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| 125 | pabHash[pabMapping[idx + 0]], 2);
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| 126 | break;
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| 127 | case 2:
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| 128 | NOT_BASE64_ENCODE(pszString, off,
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| 129 | 0,
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| 130 | pabHash[pabMapping[idx + 1]],
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| 131 | pabHash[pabMapping[idx + 0]], 3);
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| 132 | break;
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| 133 | default: AssertFailedBreak();
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| 134 | }
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| 135 |
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| 136 | return off;
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| 137 | }
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| 138 | #endif /* SHACRYPT_MINIMAL */
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| 139 |
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| 140 |
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| 141 | /**
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| 142 | * Extracts the salt from a given string.
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| 143 | *
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| 144 | * @returns Pointer to the salt string, or NULL if not found / invalid.
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| 145 | * @param pszSalt The string containing the salt.
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| 146 | * @param pcchSalt Where to return the extracted salt length (in
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| 147 | * characters) on success.
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| 148 | * @param pcRounds Where to return the round count on success.
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| 149 | */
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| 150 | static const char *rtCrShaCryptExtractSaltAndRounds(const char *pszSalt, size_t *pcchSalt, uint32_t *pcRounds)
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| 151 | {
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| 152 | /*
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| 153 | * Skip either of the two SHA-2 prefixes.
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| 154 | */
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| 155 | if ( pszSalt[0] == '$'
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| 156 | && (pszSalt[1] == '5' || pszSalt[1] == '6')
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| 157 | && pszSalt[2] == '$')
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| 158 | pszSalt += 3;
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| 159 |
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| 160 | /* Look for 'rounds=xxxxx$'. */
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| 161 | if (strncmp(pszSalt, RT_STR_TUPLE("rounds=")) == 0)
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| 162 | {
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| 163 | const char * const pszValue = pszSalt ? &pszSalt[sizeof("rounds=") - 1] : NULL; /* For ASAN build (false positive). */
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| 164 | const char * const pszDollar = strchr(pszValue, '$');
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| 165 | if (pszDollar)
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| 166 | {
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| 167 | char *pszNext = NULL;
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| 168 | int rc = RTStrToUInt32Ex(pszValue, &pszNext, 10, pcRounds);
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| 169 | if (rc == VWRN_TRAILING_CHARS && pszNext == pszDollar)
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| 170 | { /* likely */ }
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| 171 | else if (rc == VWRN_NUMBER_TOO_BIG)
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| 172 | *pcRounds = UINT32_MAX;
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| 173 | else
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| 174 | return NULL;
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| 175 | pszSalt = pszDollar + 1;
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| 176 | }
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| 177 | }
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| 178 |
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| 179 | /* Find the length of the salt - it sends with '$' or '\0'. */
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| 180 | const char * const pszDollar = strchr(pszSalt, '$');
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| 181 | if (!pszDollar)
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| 182 | *pcchSalt = strlen(pszSalt);
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| 183 | else
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| 184 | *pcchSalt = (size_t)(pszDollar - pszSalt);
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| 185 | return pszSalt;
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| 186 | }
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| 187 |
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| 188 |
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| 189 | /*
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| 190 | * The algorithm for the SHA-256 and SHA-512 encryption is identical, except for
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| 191 | * how the bytes are distributed in the final step. So we use a pre-processor
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| 192 | * code template for the implementation.
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| 193 | */
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| 194 |
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| 195 | /* SHA-256*/
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| 196 | #define TMPL_HASH_BITS 256
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| 197 | #define TMPL_HASH_SIZE RTSHA256_HASH_SIZE
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| 198 | #define TMPL_HASH_CONTEXT_T RTSHA256CONTEXT
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| 199 | #define TmplHashInit RTSha256Init
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| 200 | #define TmplHashUpdate RTSha256Update
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| 201 | #define TmplHashFinal RTSha256Final
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| 202 | #define TMPL_SHACRYPT_ID_STR RT_SHACRYPT_ID_STR_256
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| 203 | #define RTCrShaCryptTmpl RTCrShaCrypt256
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| 204 | #define RTCrShaCryptTmplEx RTCrShaCrypt256Ex
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| 205 | #define RTCrShaCryptTmplToString RTCrShaCrypt256ToString
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| 206 | #include "shacrypt-tmpl.cpp.h"
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| 207 |
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| 208 | /* SHA-512*/
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| 209 | #define TMPL_HASH_BITS 512
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| 210 | #define TMPL_HASH_SIZE RTSHA512_HASH_SIZE
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| 211 | #define TMPL_HASH_CONTEXT_T RTSHA512CONTEXT
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| 212 | #define TmplHashInit RTSha512Init
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| 213 | #define TmplHashUpdate RTSha512Update
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| 214 | #define TmplHashFinal RTSha512Final
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| 215 | #define TMPL_SHACRYPT_ID_STR RT_SHACRYPT_ID_STR_512
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| 216 | #define RTCrShaCryptTmpl RTCrShaCrypt512
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| 217 | #define RTCrShaCryptTmplEx RTCrShaCrypt512Ex
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| 218 | #define RTCrShaCryptTmplToString RTCrShaCrypt512ToString
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| 219 | #include "shacrypt-tmpl.cpp.h"
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| 220 |
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| 221 |
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| 222 | RTDECL(int) RTCrShaCryptGenerateSalt(char *pszSalt, size_t cchSalt)
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| 223 | {
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| 224 | AssertMsgReturn(cchSalt >= RT_SHACRYPT_SALT_MIN_LEN && cchSalt <= RT_SHACRYPT_SALT_MAX_LEN, ("len=%zu\n", cchSalt),
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| 225 | VERR_OUT_OF_RANGE);
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| 226 |
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| 227 | for (size_t i = 0; i < cchSalt; i++)
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| 228 | pszSalt[i] = g_achCryptBase64[RTRandU32Ex(0, sizeof(g_achCryptBase64) - 2)];
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| 229 |
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| 230 | pszSalt[cchSalt] = '\0';
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| 231 | return VINF_SUCCESS;
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| 232 | }
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| 233 |
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