1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
#include "md5more.hpp"
// md5more.cpp - Non-basic MD5 functions.
//
// Copyright © ????-2004 Athena Dev Teams
// Copyright © 2004-2011 The Mana World Development Team
// Copyright © 2011-2014 Ben Longbons <b.r.longbons@gmail.com>
//
// This file is part of The Mana World (Athena server)
//
// 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, either version 3 of the License, or
// (at your option) any later version.
//
// 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 <http://www.gnu.org/licenses/>.
#include <algorithm>
#include "../compat/rawmem.hpp"
#include "../generic/random.hpp"
#include "../io/cxxstdio.hpp"
#include "../io/read.hpp"
#include "../net/ip.hpp"
#include "../mmo/mmo.hpp"
#include "../poison.hpp"
#define X block.data
// TODO - refactor MD5 into a stream, and merge the implementations
// I once implemented an ostream that does it ...
MD5_state MD5_from_FILE(io::ReadFile& in)
{
uint64_t total_len = 0;
uint8_t buf[0x40];
uint8_t block_len = 0;
MD5_state state;
MD5_init(&state);
MD5_block block;
while (true)
{
size_t rv = in.get(sign_cast<char *>(buf + block_len), 0x40 - block_len);
if (!rv)
break;
total_len += 8 * rv; // in bits
block_len += rv;
if (block_len != 0x40)
continue;
for (int i = 0; i < 0x10; i++)
X[i] = buf[4 * i + 0] | buf[4 * i + 1] << 8 | buf[4 * i + 2] << 16 | buf[4 * i + 3] << 24;
MD5_do_block(&state, block);
block_len = 0;
}
// no more input, just pad and append the length
buf[block_len] = 0x80;
really_memset0(buf + block_len + 1, 0x40 - block_len - 1);
if (block_len < 0x38)
{
for (int i = 0; i < 8; i++)
buf[0x38 + i] = total_len >> i * 8;
}
for (int i = 0; i < 0x10; i++)
X[i] = buf[4 * i + 0] | buf[4 * i + 1] << 8 | buf[4 * i + 2] << 16 | buf[4 * i + 3] << 24;
MD5_do_block(&state, block);
if (0x38 <= block_len)
{
really_memset0(buf, 0x38);
for (int i = 0; i < 8; i++)
buf[0x38 + i] = total_len >> i * 8;
for (int i = 0; i < 0x10; i++)
X[i] = buf[4 * i + 0] | buf[4 * i + 1] << 8 | buf[4 * i + 2] << 16 | buf[4 * i + 3] << 24;
MD5_do_block(&state, block);
}
return state;
}
// Hash a password with a salt.
// Whoever wrote this FAILS programming
AccountCrypt MD5_saltcrypt(AccountPass key, SaltString salt)
{
char cbuf[64] {};
// hash the key then the salt
// buf ends up as a 64-char NUL-terminated string
md5_string tbuf, tbuf2;
MD5_to_str(MD5_from_string(key), tbuf);
MD5_to_str(MD5_from_string(salt), tbuf2);
const auto it = std::copy(tbuf.begin(), tbuf.end(), std::begin(cbuf));
auto it2 = std::copy(tbuf2.begin(), tbuf2.end(), it);
assert(it2 == std::end(cbuf));
md5_string tbuf3;
MD5_to_str(MD5_from_string(XString(std::begin(cbuf), it2, nullptr)), tbuf3);
VString<31> obuf;
// This truncates the string, but we have to keep it like that for compatibility
SNPRINTF(obuf, 32, "!%s$%s"_fmt, salt, tbuf3);
return stringish<AccountCrypt>(obuf);
}
SaltString make_salt(void)
{
char salt[5];
for (int i = 0; i < 5; i++)
// 126 would probably actually be okay
salt[i] = random_::in(48, 125);
return stringish<SaltString>(XString(salt + 0, salt + 5, nullptr));
}
bool pass_ok(AccountPass password, AccountCrypt crypted)
{
// crypted is like !salt$hash
auto begin = crypted.begin() + 1;
auto end = std::find(begin, crypted.end(), '$');
SaltString salt = stringish<SaltString>(crypted.xislice(begin, end));
return crypted == MD5_saltcrypt(password, salt);
}
// [M|h]ashes up an IP address and a secret key
// to return a hopefully unique masked IP.
IP4Address MD5_ip(IP4Address ip)
{
static SaltString secret = make_salt();
// MD5sum a secret + the IP address
VString<31> ipbuf;
SNPRINTF(ipbuf, 32, "%s %s"_fmt, ip, secret);
md5_binary obuf;
MD5_to_bin(MD5_from_string(ipbuf), obuf);
// Fold the md5sum to 32 bits, pack the bytes to an in_addr
return IP4Address({
static_cast<uint8_t>(obuf[0] ^ obuf[1] ^ obuf[8] ^ obuf[9]),
static_cast<uint8_t>(obuf[2] ^ obuf[3] ^ obuf[10] ^ obuf[11]),
static_cast<uint8_t>(obuf[4] ^ obuf[5] ^ obuf[12] ^ obuf[13]),
static_cast<uint8_t>(obuf[6] ^ obuf[7] ^ obuf[14] ^ obuf[15]),
});
}
|
