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-rw-r--r--md5crypt.c162
1 files changed, 84 insertions, 78 deletions
diff --git a/md5crypt.c b/md5crypt.c
index ba98ccccc..e483ade8c 100644
--- a/md5crypt.c
+++ b/md5crypt.c
@@ -1,159 +1,165 @@
1/* 1/*
2 * ---------------------------------------------------------------------------- 2 * ----------------------------------------------------------------------------
3 * "THE BEER-WARE LICENSE" (Revision 42): 3 * "THE BEER-WARE LICENSE" (Revision 42):
4 * <phk@login.dknet.dk> wrote this file. As long as you retain this notice you 4 * <phk@login.dknet.dk> wrote this file. As long as you retain this
5 * can do whatever you want with this stuff. If we meet some day, and you think 5 * notice you can do whatever you want with this stuff. If we meet some
6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 6 * day, and you think this stuff is worth it, you can buy me a beer in
7 * return. Poul-Henning Kamp
7 * ---------------------------------------------------------------------------- 8 * ----------------------------------------------------------------------------
8 */ 9 */
9 10
10/*
11 * Ported from FreeBSD to Linux, only minimal changes. --marekm
12 */
13
14/*
15 * Adapted from shadow-19990607 by Tudor Bosman, tudorb@jm.nu
16 */
17
18#include "includes.h" 11#include "includes.h"
19 12
20RCSID("$Id: md5crypt.c,v 1.5 2001/02/09 01:55:36 djm Exp $");
21
22#if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) 13#if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
23
24#include <openssl/md5.h> 14#include <openssl/md5.h>
25 15
26static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */ 16RCSID("$Id: md5crypt.c,v 1.6 2003/05/18 14:46:46 djm Exp $");
27 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; 17
18/* 0 ... 63 => ascii - 64 */
19static unsigned char itoa64[] =
20 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
28 21
29static char *magic = "$1$"; /* 22static char *magic = "$1$";
30 * This string is magic for
31 * this algorithm. Having
32 * it this way, we can get
33 * get better later on
34 */
35 23
36static void 24static char *
37to64(char *s, unsigned long v, int n) 25to64(unsigned long v, int n)
38{ 26{
27 static char buf[5];
28 char *s = buf;
29
30 if (n > 4)
31 return (NULL);
32
33 memset(buf, '\0', sizeof(buf));
39 while (--n >= 0) { 34 while (--n >= 0) {
40 *s++ = itoa64[v&0x3f]; 35 *s++ = itoa64[v&0x3f];
41 v >>= 6; 36 v >>= 6;
42 } 37 }
38
39 return (buf);
43} 40}
44 41
45int 42int
46is_md5_salt(const char *salt) 43is_md5_salt(const char *salt)
47{ 44{
48 return (!strncmp(salt, magic, strlen(magic))); 45 return (strncmp(salt, magic, strlen(magic)) == 0);
49} 46}
50 47
51/*
52 * UNIX password
53 *
54 * Use MD5 for what it is best at...
55 */
56
57char * 48char *
58md5_crypt(const char *pw, const char *salt) 49md5_crypt(const char *pw, const char *salt)
59{ 50{
60 static char passwd[120], *p; 51 static char passwd[120], salt_copy[9], *p;
61 static const char *sp,*ep; 52 static const char *sp, *ep;
62 unsigned char final[16]; 53 unsigned char final[16];
63 int sl,pl,i,j; 54 int sl, pl, i, j;
64 MD5_CTX ctx,ctx1; 55 MD5_CTX ctx, ctx1;
65 unsigned long l; 56 unsigned long l;
66 57
67 /* Refine the Salt first */ 58 /* Refine the Salt first */
68 sp = salt; 59 sp = salt;
69 60
70 /* If it starts with the magic string, then skip that */ 61 /* If it starts with the magic string, then skip that */
71 if(!strncmp(sp,magic,strlen(magic))) 62 if(strncmp(sp, magic, strlen(magic)) == 0)
72 sp += strlen(magic); 63 sp += strlen(magic);
73 64
74 /* It stops at the first '$', max 8 chars */ 65 /* It stops at the first '$', max 8 chars */
75 for(ep=sp;*ep && *ep != '$' && ep < (sp+8);ep++) 66 for (ep = sp; *ep != '$'; ep++) {
76 continue; 67 if (*ep == '\0' || ep >= (sp + 8))
68 return (NULL);
69 }
77 70
78 /* get the length of the true salt */ 71 /* get the length of the true salt */
79 sl = ep - sp; 72 sl = ep - sp;
80 73
74 /* Stash the salt */
75 memcpy(salt_copy, sp, sl);
76 salt_copy[sl] = '\0';
77
81 MD5_Init(&ctx); 78 MD5_Init(&ctx);
82 79
83 /* The password first, since that is what is most unknown */ 80 /* The password first, since that is what is most unknown */
84 MD5_Update(&ctx,pw,strlen(pw)); 81 MD5_Update(&ctx, pw, strlen(pw));
85 82
86 /* Then our magic string */ 83 /* Then our magic string */
87 MD5_Update(&ctx,magic,strlen(magic)); 84 MD5_Update(&ctx, magic, strlen(magic));
88 85
89 /* Then the raw salt */ 86 /* Then the raw salt */
90 MD5_Update(&ctx,sp,sl); 87 MD5_Update(&ctx, sp, sl);
91 88
92 /* Then just as many characters of the MD5(pw,salt,pw) */ 89 /* Then just as many characters of the MD5(pw, salt, pw) */
93 MD5_Init(&ctx1); 90 MD5_Init(&ctx1);
94 MD5_Update(&ctx1,pw,strlen(pw)); 91 MD5_Update(&ctx1, pw, strlen(pw));
95 MD5_Update(&ctx1,sp,sl); 92 MD5_Update(&ctx1, sp, sl);
96 MD5_Update(&ctx1,pw,strlen(pw)); 93 MD5_Update(&ctx1, pw, strlen(pw));
97 MD5_Final(final,&ctx1); 94 MD5_Final(final, &ctx1);
95
98 for(pl = strlen(pw); pl > 0; pl -= 16) 96 for(pl = strlen(pw); pl > 0; pl -= 16)
99 MD5_Update(&ctx,final,pl>16 ? 16 : pl); 97 MD5_Update(&ctx, final, pl > 16 ? 16 : pl);
100 98
101 /* Don't leave anything around in vm they could use. */ 99 /* Don't leave anything around in vm they could use. */
102 memset(final,0,sizeof final); 100 memset(final, '\0', sizeof final);
103 101
104 /* Then something really weird... */ 102 /* Then something really weird... */
105 for (j=0,i = strlen(pw); i ; i >>= 1) 103 for (j = 0, i = strlen(pw); i != 0; i >>= 1)
106 if(i&1) 104 if (i & 1)
107 MD5_Update(&ctx, final+j, 1); 105 MD5_Update(&ctx, final + j, 1);
108 else 106 else
109 MD5_Update(&ctx, pw+j, 1); 107 MD5_Update(&ctx, pw + j, 1);
110 108
111 /* Now make the output string */ 109 /* Now make the output string */
112 strcpy(passwd,magic); 110 snprintf(passwd, sizeof(passwd), "%s%s$", magic, salt_copy);
113 strncat(passwd,sp,sl);
114 strcat(passwd,"$");
115 111
116 MD5_Final(final,&ctx); 112 MD5_Final(final, &ctx);
117 113
118 /* 114 /*
119 * and now, just to make sure things don't run too fast 115 * and now, just to make sure things don't run too fast
120 * On a 60 Mhz Pentium this takes 34 msec, so you would 116 * On a 60 Mhz Pentium this takes 34 msec, so you would
121 * need 30 seconds to build a 1000 entry dictionary... 117 * need 30 seconds to build a 1000 entry dictionary...
122 */ 118 */
123 for(i=0;i<1000;i++) { 119 for(i = 0; i < 1000; i++) {
124 MD5_Init(&ctx1); 120 MD5_Init(&ctx1);
125 if(i & 1) 121 if (i & 1)
126 MD5_Update(&ctx1,pw,strlen(pw)); 122 MD5_Update(&ctx1, pw, strlen(pw));
127 else 123 else
128 MD5_Update(&ctx1,final,16); 124 MD5_Update(&ctx1, final, 16);
129 125
130 if(i % 3) 126 if (i % 3)
131 MD5_Update(&ctx1,sp,sl); 127 MD5_Update(&ctx1, sp, sl);
132 128
133 if(i % 7) 129 if (i % 7)
134 MD5_Update(&ctx1,pw,strlen(pw)); 130 MD5_Update(&ctx1, pw, strlen(pw));
135 131
136 if(i & 1) 132 if (i & 1)
137 MD5_Update(&ctx1,final,16); 133 MD5_Update(&ctx1, final, 16);
138 else 134 else
139 MD5_Update(&ctx1,pw,strlen(pw)); 135 MD5_Update(&ctx1, pw, strlen(pw));
140 MD5_Final(final,&ctx1); 136
137 MD5_Final(final, &ctx1);
141 } 138 }
142 139
143 p = passwd + strlen(passwd); 140 p = passwd + strlen(passwd);
144 141
145 l = (final[ 0]<<16) | (final[ 6]<<8) | final[12]; to64(p,l,4); p += 4; 142 l = (final[ 0]<<16) | (final[ 6]<<8) | final[12];
146 l = (final[ 1]<<16) | (final[ 7]<<8) | final[13]; to64(p,l,4); p += 4; 143 strlcat(passwd, to64(l, 4), sizeof(passwd));
147 l = (final[ 2]<<16) | (final[ 8]<<8) | final[14]; to64(p,l,4); p += 4; 144 l = (final[ 1]<<16) | (final[ 7]<<8) | final[13];
148 l = (final[ 3]<<16) | (final[ 9]<<8) | final[15]; to64(p,l,4); p += 4; 145 strlcat(passwd, to64(l, 4), sizeof(passwd));
149 l = (final[ 4]<<16) | (final[10]<<8) | final[ 5]; to64(p,l,4); p += 4; 146 l = (final[ 2]<<16) | (final[ 8]<<8) | final[14];
150 l = final[11] ; to64(p,l,2); p += 2; 147 strlcat(passwd, to64(l, 4), sizeof(passwd));
151 *p = '\0'; 148 l = (final[ 3]<<16) | (final[ 9]<<8) | final[15];
149 strlcat(passwd, to64(l, 4), sizeof(passwd));
150 l = (final[ 4]<<16) | (final[10]<<8) | final[ 5];
151 strlcat(passwd, to64(l, 4), sizeof(passwd));
152 l = final[11] ;
153 strlcat(passwd, to64(l, 2), sizeof(passwd));
152 154
153 /* Don't leave anything around in vm they could use. */ 155 /* Don't leave anything around in vm they could use. */
154 memset(final,0,sizeof final); 156 memset(final, 0, sizeof(final));
157 memset(salt_copy, 0, sizeof(salt_copy));
158 memset(&ctx, 0, sizeof(ctx));
159 memset(&ctx1, 0, sizeof(ctx1));
160 (void)to64(0, 4)
155 161
156 return passwd; 162 return (passwd);
157} 163}
158 164
159#endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */ 165#endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */