auth_subr.c revision 211095 
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: head/sbin/iscontrol/auth_subr.c 211095 2010-08-09 12:36:36Z des $");
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#if __FreeBSD_version < 500000
44#include <sys/time.h>
45#endif
46#include <unistd.h>
47#include <stdlib.h>
48#include <stdio.h>
49#include <string.h>
50#include <fcntl.h>
51
52#include <md5.h>
53#include <sha.h>
54
55#include <dev/iscsi/initiator/iscsi.h>
56#include "iscontrol.h"
57
58static int
59chapMD5(char id, char *cp, char *chapSecret, unsigned char *digest)
60{
61     MD5_CTX	ctx;
62     char	*tmp;
63     int	len;
64
65     debug_called(3);
66
67     MD5Init(&ctx);
68
69     MD5Update(&ctx, &id, 1);
70
71     if((len = str2bin(chapSecret, &tmp)) == 0) {
72	  // print error
73	  return -1;
74     }
75     MD5Update(&ctx, tmp, len);
76     free(tmp);
77
78     if((len = str2bin(cp, &tmp)) == 0) {
79	  // print error
80	  return -1;
81     }
82     MD5Update(&ctx, tmp, len);
83     free(tmp);
84
85     MD5Final(digest, &ctx);
86
87
88     return 0;
89}
90
91static int
92chapSHA1(char id, char *cp, char *chapSecret, unsigned char *digest)
93{
94     SHA1_CTX	ctx;
95     char	*tmp;
96     int	len;
97
98     debug_called(3);
99
100     SHA1_Init(&ctx);
101
102     SHA1_Update(&ctx, &id, 1);
103
104     if((len = str2bin(chapSecret, &tmp)) == 0) {
105	  // print error
106	  return -1;
107     }
108     SHA1_Update(&ctx, tmp, len);
109     free(tmp);
110
111     if((len = str2bin(cp, &tmp)) == 0) {
112	  // print error
113	  return -1;
114     }
115     SHA1_Update(&ctx, tmp, len);
116     free(tmp);
117
118     SHA1_Final(digest, &ctx);
119
120     return 0;
121
122}
123/*
124 | the input text format can be anything that the rfc3270 defines
125 | (see section 5.1 and str2bin)
126 | digest length for md5 is 128bits, and for sha1 is 160bits.
127 | digest is an ASCII string which represents the bits in
128 | hexadecimal or base64 according to the challenge(cp) format
129 */
130char *
131chapDigest(char *ap, char id, char *cp, char *chapSecret)
132{
133     int	len;
134     unsigned	char digest[20];
135     char	encoding[3];
136
137     debug_called(3);
138
139     len = 0;
140     if(strcmp(ap, "5") == 0 && chapMD5(id, cp, chapSecret, digest) == 0)
141	  len = 16;
142     else
143     if(strcmp(ap, "7") == 0 && chapSHA1(id, cp, chapSecret, digest) == 0)
144	  len = 20;
145
146     if(len) {
147	  sprintf(encoding, "%.2s", cp);
148	  return bin2str(encoding, digest, len);
149     }
150
151     return NULL;
152}
153
154char *
155genChapChallenge(char *encoding, uint len)
156{
157     int	fd;
158     unsigned	char tmp[1024];
159
160     if(len > sizeof(tmp))
161	  return NULL;
162
163     if((fd = open("/dev/random", O_RDONLY)) != -1) {
164	  read(fd, tmp, len);
165	  close(fd);
166	  return bin2str(encoding, tmp, len);
167     }
168     perror("/dev/random");
169     // make up something ...
170     return NULL;
171}
172
173#ifdef TEST_AUTH
174static void
175puke(char *str, unsigned char *dg, int len)
176{
177     printf("%3d] %s\n     0x", len, str);
178     while(len-- > 0)
179	  printf("%02x", *dg++);
180     printf("\n");
181}
182
183main(int cc, char **vv)
184{
185     char *p, *ap, *ip, *cp, *chapSecret, *digest;
186     int len;
187
188#if 0
189     ap = "5";
190     chapSecret = "0xa5aff013dd839b1edd31ee73a1df0b1b";
191//     chapSecret = "abcdefghijklmnop";
192     len = str2bin(chapSecret, &cp);
193     puke(chapSecret, cp, len);
194
195     ip = "238";
196     cp = "0xbd456029";
197
198
199     if((digest = chapDigest(ap, ip, cp, chapSecret)) != NULL) {
200	  len = str2bin(digest, &cp);
201	  puke(digest, cp, len);
202     }
203#else
204     printf("%d] %s\n", 24, genChallenge("0X", 24));
205#endif
206}
207#endif
208