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1 | /* | |
2 | * ---------------------------------------------------------------------------- | |
3 | * "THE BEER-WARE LICENSE" (Revision 42): | |
4 | * <phk@login.dknet.dk> wrote this file. As long as you retain this | |
5 | * notice you can do whatever you want with this stuff. If we meet some | |
6 | * day, and you think this stuff is worth it, you can buy me a beer in | |
7 | * return. Poul-Henning Kamp | |
8 | * ---------------------------------------------------------------------------- | |
9 | */ | |
10 | ||
11 | #include "includes.h" | |
12 | ||
13 | #if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) | |
14 | #include <sys/types.h> | |
15 | ||
16 | #include <string.h> | |
17 | ||
18 | #include <openssl/md5.h> | |
19 | ||
20 | /* 0 ... 63 => ascii - 64 */ | |
21 | static unsigned char itoa64[] = | |
22 | "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; | |
23 | ||
24 | static char *magic = "$1$"; | |
25 | ||
26 | static char * | |
27 | to64(unsigned long v, int n) | |
28 | { | |
29 | static char buf[5]; | |
30 | char *s = buf; | |
31 | ||
32 | if (n > 4) | |
33 | return (NULL); | |
34 | ||
35 | memset(buf, '\0', sizeof(buf)); | |
36 | while (--n >= 0) { | |
37 | *s++ = itoa64[v&0x3f]; | |
38 | v >>= 6; | |
39 | } | |
40 | ||
41 | return (buf); | |
42 | } | |
43 | ||
44 | int | |
45 | is_md5_salt(const char *salt) | |
46 | { | |
47 | return (strncmp(salt, magic, strlen(magic)) == 0); | |
48 | } | |
49 | ||
50 | char * | |
51 | md5_crypt(const char *pw, const char *salt) | |
52 | { | |
53 | static char passwd[120], salt_copy[9], *p; | |
54 | static const char *sp, *ep; | |
55 | unsigned char final[16]; | |
56 | int sl, pl, i, j; | |
57 | MD5_CTX ctx, ctx1; | |
58 | unsigned long l; | |
59 | ||
60 | /* Refine the Salt first */ | |
61 | sp = salt; | |
62 | ||
63 | /* If it starts with the magic string, then skip that */ | |
64 | if(strncmp(sp, magic, strlen(magic)) == 0) | |
65 | sp += strlen(magic); | |
66 | ||
67 | /* It stops at the first '$', max 8 chars */ | |
68 | for (ep = sp; *ep != '$'; ep++) { | |
69 | if (*ep == '\0' || ep >= (sp + 8)) | |
70 | return (NULL); | |
71 | } | |
72 | ||
73 | /* get the length of the true salt */ | |
74 | sl = ep - sp; | |
75 | ||
76 | /* Stash the salt */ | |
77 | memcpy(salt_copy, sp, sl); | |
78 | salt_copy[sl] = '\0'; | |
79 | ||
80 | MD5_Init(&ctx); | |
81 | ||
82 | /* The password first, since that is what is most unknown */ | |
83 | MD5_Update(&ctx, pw, strlen(pw)); | |
84 | ||
85 | /* Then our magic string */ | |
86 | MD5_Update(&ctx, magic, strlen(magic)); | |
87 | ||
88 | /* Then the raw salt */ | |
89 | MD5_Update(&ctx, sp, sl); | |
90 | ||
91 | /* Then just as many characters of the MD5(pw, salt, pw) */ | |
92 | MD5_Init(&ctx1); | |
93 | MD5_Update(&ctx1, pw, strlen(pw)); | |
94 | MD5_Update(&ctx1, sp, sl); | |
95 | MD5_Update(&ctx1, pw, strlen(pw)); | |
96 | MD5_Final(final, &ctx1); | |
97 | ||
98 | for(pl = strlen(pw); pl > 0; pl -= 16) | |
99 | MD5_Update(&ctx, final, pl > 16 ? 16 : pl); | |
100 | ||
101 | /* Don't leave anything around in vm they could use. */ | |
102 | memset(final, '\0', sizeof final); | |
103 | ||
104 | /* Then something really weird... */ | |
105 | for (j = 0, i = strlen(pw); i != 0; i >>= 1) | |
106 | if (i & 1) | |
107 | MD5_Update(&ctx, final + j, 1); | |
108 | else | |
109 | MD5_Update(&ctx, pw + j, 1); | |
110 | ||
111 | /* Now make the output string */ | |
112 | snprintf(passwd, sizeof(passwd), "%s%s$", magic, salt_copy); | |
113 | ||
114 | MD5_Final(final, &ctx); | |
115 | ||
116 | /* | |
117 | * and now, just to make sure things don't run too fast | |
118 | * On a 60 Mhz Pentium this takes 34 msec, so you would | |
119 | * need 30 seconds to build a 1000 entry dictionary... | |
120 | */ | |
121 | for(i = 0; i < 1000; i++) { | |
122 | MD5_Init(&ctx1); | |
123 | if (i & 1) | |
124 | MD5_Update(&ctx1, pw, strlen(pw)); | |
125 | else | |
126 | MD5_Update(&ctx1, final, 16); | |
127 | ||
128 | if (i % 3) | |
129 | MD5_Update(&ctx1, sp, sl); | |
130 | ||
131 | if (i % 7) | |
132 | MD5_Update(&ctx1, pw, strlen(pw)); | |
133 | ||
134 | if (i & 1) | |
135 | MD5_Update(&ctx1, final, 16); | |
136 | else | |
137 | MD5_Update(&ctx1, pw, strlen(pw)); | |
138 | ||
139 | MD5_Final(final, &ctx1); | |
140 | } | |
141 | ||
142 | p = passwd + strlen(passwd); | |
143 | ||
144 | l = (final[ 0]<<16) | (final[ 6]<<8) | final[12]; | |
145 | strlcat(passwd, to64(l, 4), sizeof(passwd)); | |
146 | l = (final[ 1]<<16) | (final[ 7]<<8) | final[13]; | |
147 | strlcat(passwd, to64(l, 4), sizeof(passwd)); | |
148 | l = (final[ 2]<<16) | (final[ 8]<<8) | final[14]; | |
149 | strlcat(passwd, to64(l, 4), sizeof(passwd)); | |
150 | l = (final[ 3]<<16) | (final[ 9]<<8) | final[15]; | |
151 | strlcat(passwd, to64(l, 4), sizeof(passwd)); | |
152 | l = (final[ 4]<<16) | (final[10]<<8) | final[ 5]; | |
153 | strlcat(passwd, to64(l, 4), sizeof(passwd)); | |
154 | l = final[11] ; | |
155 | strlcat(passwd, to64(l, 2), sizeof(passwd)); | |
156 | ||
157 | /* Don't leave anything around in vm they could use. */ | |
158 | memset(final, 0, sizeof(final)); | |
159 | memset(salt_copy, 0, sizeof(salt_copy)); | |
160 | memset(&ctx, 0, sizeof(ctx)); | |
161 | memset(&ctx1, 0, sizeof(ctx1)); | |
162 | (void)to64(0, 4); | |
163 | ||
164 | return (passwd); | |
165 | } | |
166 | ||
167 | #endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */ |