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