xref: /PHP-8.1/ext/standard/php_crypt_r.c (revision 257f1089)
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