1 /*
2 +----------------------------------------------------------------------+
3 | Copyright (c) The PHP Group |
4 +----------------------------------------------------------------------+
5 | This source file is subject to version 3.01 of the PHP license, |
6 | that is bundled with this package in the file LICENSE, and is |
7 | available through the world-wide-web at the following url: |
8 | https://www.php.net/license/3_01.txt |
9 | If you did not receive a copy of the PHP license and are unable to |
10 | obtain it through the world-wide-web, please send a note to |
11 | license@php.net so we can mail you a copy immediately. |
12 +----------------------------------------------------------------------+
13 | Authors: Pierre Alain Joye <pajoye@php.net |
14 +----------------------------------------------------------------------+
15 */
16
17 /*
18 * License for the Unix md5crypt implementation (md5_crypt):
19 *
20 * ----------------------------------------------------------------------------
21 * "THE BEER-WARE LICENSE" (Revision 42):
22 * <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
23 * can do whatever you want with this stuff. If we meet some day, and you think
24 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
25 * ----------------------------------------------------------------------------
26 *
27 * from FreeBSD: crypt.c,v 1.5 1996/10/14 08:34:02 phk Exp
28 * via OpenBSD: md5crypt.c,v 1.9 1997/07/23 20:58:27 kstailey Exp
29 * via NetBSD: md5crypt.c,v 1.4.2.1 2002/01/22 19:31:59 he Exp
30 *
31 */
32
33 #include "php.h"
34
35 #include <string.h>
36
37 #ifdef PHP_WIN32
38 # include <windows.h>
39 # include <Wincrypt.h>
40 #endif
41
42 #include "php_crypt_r.h"
43 #include "crypt_freesec.h"
44 #include "ext/standard/md5.h"
45
46 #ifdef ZTS
47 MUTEX_T php_crypt_extended_init_lock;
48 #endif
49
php_init_crypt_r(void)50 void php_init_crypt_r(void)
51 {
52 #ifdef ZTS
53 php_crypt_extended_init_lock = tsrm_mutex_alloc();
54 #endif
55 }
56
php_shutdown_crypt_r(void)57 void php_shutdown_crypt_r(void)
58 {
59 #ifdef ZTS
60 tsrm_mutex_free(php_crypt_extended_init_lock);
61 #endif
62 }
63
_crypt_extended_init_r(void)64 void _crypt_extended_init_r(void)
65 {
66 static int initialized = 0;
67
68 #ifdef ZTS
69 tsrm_mutex_lock(php_crypt_extended_init_lock);
70 #endif
71
72 if (!initialized) {
73 initialized = 1;
74 _crypt_extended_init();
75 }
76
77 #ifdef ZTS
78 tsrm_mutex_unlock(php_crypt_extended_init_lock);
79 #endif
80 }
81
82 /* MD5 crypt implementation using the windows CryptoApi */
83 #define MD5_MAGIC "$1$"
84 #define MD5_MAGIC_LEN 3
85
86 static const unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
87 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
88
89 /* Convert a 16/32 bit integer to Base64 string representation */
to64(char * s,int32_t v,int n)90 static void to64(char *s, int32_t v, int n)
91 {
92 while (--n >= 0) {
93 *s++ = itoa64[v & 0x3f];
94 v >>= 6;
95 }
96 }
97
98 /*
99 * MD5 password encryption.
100 */
php_md5_crypt_r(const char * pw,const char * salt,char * out)101 char * php_md5_crypt_r(const char *pw, const char *salt, char *out)
102 {
103 ZEND_TLS char passwd[MD5_HASH_MAX_LEN], *p;
104 const char *sp, *ep;
105 unsigned char final[16];
106 unsigned int i, sl, pwl;
107 PHP_MD5_CTX ctx, ctx1;
108 uint32_t l;
109 int pl;
110
111 pwl = strlen(pw);
112
113 /* Refine the salt first */
114 sp = salt;
115
116 /* If it starts with the magic string, then skip that */
117 if (strncmp(sp, MD5_MAGIC, MD5_MAGIC_LEN) == 0)
118 sp += MD5_MAGIC_LEN;
119
120 /* It stops at the first '$', max 8 chars */
121 for (ep = sp; *ep != '\0' && *ep != '$' && ep < (sp + 8); ep++);
122
123 /* get the length of the true salt */
124 sl = ep - sp;
125
126 PHP_MD5Init(&ctx);
127
128 /* The password first, since that is what is most unknown */
129 PHP_MD5Update(&ctx, (const unsigned char *)pw, pwl);
130
131 /* Then our magic string */
132 PHP_MD5Update(&ctx, (const unsigned char *)MD5_MAGIC, MD5_MAGIC_LEN);
133
134 /* Then the raw salt */
135 PHP_MD5Update(&ctx, (const unsigned char *)sp, sl);
136
137 /* Then just as many characters of the MD5(pw,salt,pw) */
138 PHP_MD5Init(&ctx1);
139 PHP_MD5Update(&ctx1, (const unsigned char *)pw, pwl);
140 PHP_MD5Update(&ctx1, (const unsigned char *)sp, sl);
141 PHP_MD5Update(&ctx1, (const unsigned char *)pw, pwl);
142 PHP_MD5Final(final, &ctx1);
143
144 for (pl = pwl; pl > 0; pl -= 16)
145 PHP_MD5Update(&ctx, final, (unsigned int)(pl > 16 ? 16 : pl));
146
147 /* Don't leave anything around in vm they could use. */
148 ZEND_SECURE_ZERO(final, sizeof(final));
149
150 /* Then something really weird... */
151 for (i = pwl; i != 0; i >>= 1)
152 if ((i & 1) != 0)
153 PHP_MD5Update(&ctx, final, 1);
154 else
155 PHP_MD5Update(&ctx, (const unsigned char *)pw, 1);
156
157 /* Now make the output string */
158 memcpy(passwd, MD5_MAGIC, MD5_MAGIC_LEN);
159 strlcpy(passwd + MD5_MAGIC_LEN, sp, sl + 1);
160 strcat(passwd, "$");
161
162 PHP_MD5Final(final, &ctx);
163
164 /*
165 * And now, just to make sure things don't run too fast. On a 60 MHz
166 * Pentium this takes 34 msec, so you would need 30 seconds to build
167 * a 1000 entry dictionary...
168 */
169 for (i = 0; i < 1000; i++) {
170 PHP_MD5Init(&ctx1);
171
172 if ((i & 1) != 0)
173 PHP_MD5Update(&ctx1, (const unsigned char *)pw, pwl);
174 else
175 PHP_MD5Update(&ctx1, final, 16);
176
177 if ((i % 3) != 0)
178 PHP_MD5Update(&ctx1, (const unsigned char *)sp, sl);
179
180 if ((i % 7) != 0)
181 PHP_MD5Update(&ctx1, (const unsigned char *)pw, pwl);
182
183 if ((i & 1) != 0)
184 PHP_MD5Update(&ctx1, final, 16);
185 else
186 PHP_MD5Update(&ctx1, (const unsigned char *)pw, pwl);
187
188 PHP_MD5Final(final, &ctx1);
189 }
190
191 p = passwd + sl + MD5_MAGIC_LEN + 1;
192
193 l = (final[ 0]<<16) | (final[ 6]<<8) | final[12]; to64(p,l,4); p += 4;
194 l = (final[ 1]<<16) | (final[ 7]<<8) | final[13]; to64(p,l,4); p += 4;
195 l = (final[ 2]<<16) | (final[ 8]<<8) | final[14]; to64(p,l,4); p += 4;
196 l = (final[ 3]<<16) | (final[ 9]<<8) | final[15]; to64(p,l,4); p += 4;
197 l = (final[ 4]<<16) | (final[10]<<8) | final[ 5]; to64(p,l,4); p += 4;
198 l = final[11] ; to64(p,l,2); p += 2;
199 *p = '\0';
200
201 /* Don't leave anything around in vm they could use. */
202 ZEND_SECURE_ZERO(final, sizeof(final));
203 return (passwd);
204 }
205
