sbin/iscontrol/auth_subr.c

   1 /*-
   2  * Copyright (c) 2005-2008 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
  34 #include <sys/param.h>
  35 #include <sys/types.h>
  36 #include <sys/socket.h>
  37 #include <sys/sysctl.h>
  38
  39 #include <netinet/in.h>
  40 #include <netinet/tcp.h>
  41 #include <arpa/inet.h>
  42 #if __FreeBSD_version < 500000
  43 #include <sys/time.h>
  44 #endif
  45 #include <unistd.h>
  46 #include <stdlib.h>
  47 #include <stdio.h>
  48 #include <string.h>
  49 #include <fcntl.h>
  50
  51 #include <md5.h>
  52 #include <sha.h>
  53
  54 #include "iscsi.h"
  55 #include "iscontrol.h"
  56
  57 static int
  58 chapMD5(char id, char *cp, char *chapSecret, unsigned char *digest)
  59 {
  60      MD5_CTX    ctx;
  61      char       *tmp;
  62      int        len;
  63
  64      debug_called(3);
  65
  66      MD5Init(&ctx);
  67
  68      MD5Update(&ctx, &id, 1);
  69
  70      if((len = str2bin(chapSecret, &tmp)) == 0) {
  71           // print error
  72           return -1;
  73      }
  74      MD5Update(&ctx, tmp, len);
  75      free(tmp);
  76
  77      if((len = str2bin(cp, &tmp)) == 0) {
  78           // print error
  79           return -1;
  80      }
  81      MD5Update(&ctx, tmp, len);
  82      free(tmp);
  83
  84      MD5Final(digest, &ctx);
  85
  86
  87      return 0;
  88 }
  89
  90 static int
  91 chapSHA1(char id, char *cp, char *chapSecret, unsigned char *digest)
  92 {
  93      SHA1_CTX   ctx;
  94      char       *tmp;
  95      int        len;
  96
  97      debug_called(3);
  98
  99      SHA1_Init(&ctx);
 100
 101      SHA1_Update(&ctx, &id, 1);
 102
 103      if((len = str2bin(chapSecret, &tmp)) == 0) {
 104           // print error
 105           return -1;
 106      }
 107      SHA1_Update(&ctx, tmp, len);
 108      free(tmp);
 109
 110      if((len = str2bin(cp, &tmp)) == 0) {
 111           // print error
 112           return -1;
 113      }
 114      SHA1_Update(&ctx, tmp, len);
 115      free(tmp);
 116
 117      SHA1_Final(digest, &ctx);
 118
 119      return 0;
 120
 121 }
 122 /*
 123  | the input text format can be anything that the rfc3270 defines
 124  | (see section 5.1 and str2bin)
 125  | digest length for md5 is 128bits, and for sha1 is 160bits.
 126  | digest is an ASCII string which represents the bits in
 127  | hexadecimal or base64 according to the challenge(cp) format
 128  */
 129 char *
 130 chapDigest(char *ap, char id, char *cp, char *chapSecret)
 131 {
 132      int        len;
 133      unsigned   char digest[20];
 134      char       encoding[3];
 135
 136      debug_called(3);
 137
 138      len = 0;
 139      if(strcmp(ap, "5") == 0 && chapMD5(id, cp, chapSecret, digest) == 0)
 140           len = 16;
 141      else
 142      if(strcmp(ap, "7") == 0 && chapSHA1(id, cp, chapSecret, digest) == 0)
 143           len = 20;
 144
 145      if(len) {
 146           sprintf(encoding, "%.2s", cp);
 147           return bin2str(encoding, digest, len);
 148      }
 149
 150      return NULL;
 151 }
 152
 153 char *
 154 genChapChallenge(char *encoding, size_t len)
 155 {
 156      int        fd;
 157      unsigned   char tmp[1024];
 158
 159      if(len > sizeof(tmp))
 160           return NULL;
 161
 162      if((fd = open("/dev/random", O_RDONLY)) != -1) {
 163           read(fd, tmp, len);
 164           close(fd);
 165           return bin2str(encoding, tmp, len);
 166      }
 167      perror("/dev/random");
 168      // make up something ...
 169      return NULL;
 170 }
 171
 172 #ifdef TEST_AUTH
 173 static void
 174 puke(char *str, unsigned char *dg, int len)
 175 {
 176      printf("%3d] %s\n     0x", len, str);
 177      while(len-- > 0)
 178           printf("%02x", *dg++);
 179      printf("\n");
 180 }
 181
 182 main(int cc, char **vv)
 183 {
 184      char *p, *ap, *ip, *cp, *chapSecret, *digest;
 185      int len;
 186
 187 #if 0
 188      ap = "5";
 189      chapSecret = "0xa5aff013dd839b1edd31ee73a1df0b1b";
 190 //     chapSecret = "abcdefghijklmnop";
 191      len = str2bin(chapSecret, &cp);
 192      puke(chapSecret, cp, len);
 193
 194      ip = "238";
 195      cp = "0xbd456029";
 196
 197
 198      if((digest = chapDigest(ap, ip, cp, chapSecret)) != NULL) {
 199           len = str2bin(digest, &cp);
 200           puke(digest, cp, len);
 201      }
 202 #else
 203      printf("%d] %s\n", 24, genChallenge("0X", 24));
 204 #endif
 205 }
 206 #endif