1 /*-
2 * Copyright (c) 2005-2010 Daniel Braniss <danny@cs.huji.ac.il>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28 /*
29 | $Id: auth_subr.c,v 2.2 2007/06/01 08:09:37 danny Exp $
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
34
35 #include <sys/param.h>
36 #include <sys/types.h>
37 #include <sys/socket.h>
38 #include <sys/sysctl.h>
39
40 #include <netinet/in.h>
41 #include <netinet/tcp.h>
42 #include <arpa/inet.h>
43 #include <unistd.h>
44 #include <stdlib.h>
45 #include <stdio.h>
46 #include <string.h>
47 #include <fcntl.h>
48
49 #include <md5.h>
50 #include <sha.h>
51
52 #include <dev/iscsi_initiator/iscsi.h>
53 #include "iscontrol.h"
54
55 static int
chapMD5(char id,char * cp,char * chapSecret,unsigned char * digest)56 chapMD5(char id, char *cp, char *chapSecret, unsigned char *digest)
57 {
58 MD5_CTX ctx;
59 char *tmp;
60 int len;
61
62 debug_called(3);
63
64 MD5Init(&ctx);
65
66 MD5Update(&ctx, &id, 1);
67
68 if((len = str2bin(chapSecret, &tmp)) == 0) {
69 // print error
70 return -1;
71 }
72 MD5Update(&ctx, tmp, len);
73 free(tmp);
74
75 if((len = str2bin(cp, &tmp)) == 0) {
76 // print error
77 return -1;
78 }
79 MD5Update(&ctx, tmp, len);
80 free(tmp);
81
82 MD5Final(digest, &ctx);
83
84
85 return 0;
86 }
87
88 static int
chapSHA1(char id,char * cp,char * chapSecret,unsigned char * digest)89 chapSHA1(char id, char *cp, char *chapSecret, unsigned char *digest)
90 {
91 SHA1_CTX ctx;
92 char *tmp;
93 int len;
94
95 debug_called(3);
96
97 SHA1_Init(&ctx);
98
99 SHA1_Update(&ctx, &id, 1);
100
101 if((len = str2bin(chapSecret, &tmp)) == 0) {
102 // print error
103 return -1;
104 }
105 SHA1_Update(&ctx, tmp, len);
106 free(tmp);
107
108 if((len = str2bin(cp, &tmp)) == 0) {
109 // print error
110 return -1;
111 }
112 SHA1_Update(&ctx, tmp, len);
113 free(tmp);
114
115 SHA1_Final(digest, &ctx);
116
117 return 0;
118
119 }
120 /*
121 | the input text format can be anything that the rfc3270 defines
122 | (see section 5.1 and str2bin)
123 | digest length for md5 is 128bits, and for sha1 is 160bits.
124 | digest is an ASCII string which represents the bits in
125 | hexadecimal or base64 according to the challenge(cp) format
126 */
127 char *
chapDigest(char * ap,char id,char * cp,char * chapSecret)128 chapDigest(char *ap, char id, char *cp, char *chapSecret)
129 {
130 int len;
131 unsigned char digest[20];
132 char encoding[3];
133
134 debug_called(3);
135
136 len = 0;
137 if(strcmp(ap, "5") == 0 && chapMD5(id, cp, chapSecret, digest) == 0)
138 len = 16;
139 else
140 if(strcmp(ap, "7") == 0 && chapSHA1(id, cp, chapSecret, digest) == 0)
141 len = 20;
142
143 if(len) {
144 sprintf(encoding, "%.2s", cp);
145 return bin2str(encoding, digest, len);
146 }
147
148 return NULL;
149 }
150
151 char *
genChapChallenge(char * encoding,uint len)152 genChapChallenge(char *encoding, uint len)
153 {
154 int fd;
155 unsigned char tmp[1024];
156
157 if(len > sizeof(tmp))
158 return NULL;
159
160 if((fd = open("/dev/random", O_RDONLY)) != -1) {
161 read(fd, tmp, len);
162 close(fd);
163 return bin2str(encoding, tmp, len);
164 }
165 perror("/dev/random");
166 // make up something ...
167 return NULL;
168 }
169
170 #ifdef TEST_AUTH
171 static void
puke(char * str,unsigned char * dg,int len)172 puke(char *str, unsigned char *dg, int len)
173 {
174 printf("%3d] %s\n 0x", len, str);
175 while(len-- > 0)
176 printf("%02x", *dg++);
177 printf("\n");
178 }
179
main(int cc,char ** vv)180 main(int cc, char **vv)
181 {
182 char *p, *ap, *ip, *cp, *chapSecret, *digest;
183 int len;
184
185 #if 0
186 ap = "5";
187 chapSecret = "0xa5aff013dd839b1edd31ee73a1df0b1b";
188 // chapSecret = "abcdefghijklmnop";
189 len = str2bin(chapSecret, &cp);
190 puke(chapSecret, cp, len);
191
192 ip = "238";
193 cp = "0xbd456029";
194
195
196 if((digest = chapDigest(ap, ip, cp, chapSecret)) != NULL) {
197 len = str2bin(digest, &cp);
198 puke(digest, cp, len);
199 }
200 #else
201 printf("%d] %s\n", 24, genChallenge("0X", 24));
202 #endif
203 }
204 #endif
205