package/ead/src/tinysrp/tconf.c

   1 /*
   2  * Copyright (c) 1997-2000  The Stanford SRP Authentication Project
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining
   6  * a copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sublicense, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be
  14  * included in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
  17  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
  18  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  19  *
  20  * IN NO EVENT SHALL STANFORD BE LIABLE FOR ANY SPECIAL, INCIDENTAL,
  21  * INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES WHATSOEVER
  22  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER OR NOT ADVISED OF
  23  * THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF LIABILITY, ARISING OUT
  24  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  25  *
  26  * In addition, the following conditions apply:
  27  *
  28  * 1. Any software that incorporates the SRP authentication technology
  29  *    must display the following acknowlegment:
  30  *    "This product uses the 'Secure Remote Password' cryptographic
  31  *     authentication system developed by Tom Wu (tjw@CS.Stanford.EDU)."
  32  *
  33  * 2. Any software that incorporates all or part of the SRP distribution
  34  *    itself must also display the following acknowledgment:
  35  *    "This product includes software developed by Tom Wu and Eugene
  36  *     Jhong for the SRP Distribution (http://srp.stanford.edu/srp/)."
  37  *
  38  * 3. Redistributions in source or binary form must retain an intact copy
  39  *    of this copyright notice and list of conditions.
  40  */
  41
  42 #include <unistd.h>     /* close getlogin */
  43 #include <stdlib.h>     /* atexit exit */
  44 #include <stdio.h>
  45 #include <string.h>
  46
  47 #include "t_pwd.h"
  48
  49 #define MIN_BASIS_BITS 512
  50 #define BASIS_BITS 2048
  51
  52 extern int  optind;
  53 extern char *optarg;
  54
  55 extern int errno;
  56
  57 char *progName;
  58
  59 int  debug   = 0;
  60 int  verbose = 0;
  61 int  composite = 0;
  62
  63 int main(argc, argv)
  64      int argc;
  65      char *argv[];
  66 {
  67   char *chp;
  68   char *configFile = NULL;
  69   char cbuf[256];
  70   char b64buf[MAXB64PARAMLEN];
  71   int c, ch, i, lastidx, keylen, yesno, fsize, status, nparams;
  72   FILE *efp;
  73
  74   struct t_preconf * tpc;
  75   struct t_conf tcs;
  76   struct t_conf * tc = &tcs;
  77   struct t_confent * tcent;
  78
  79   progName = *argv;
  80   if ((chp = strrchr(progName, '/')) != (char *) 0) progName = chp + 1;
  81
  82   while ((ch = getopt(argc, argv, "dv2c:")) != EOF)
  83     switch(ch) {
  84     case 'c':
  85       configFile = optarg;
  86       break;
  87     case 'v':
  88       verbose++;
  89       break;
  90     case 'd':
  91       debug++;
  92       break;
  93     case '2':
  94       composite++;
  95       break;
  96     default:
  97       fprintf(stderr, "usage: %s [-dv2] [-c configfile]\n", progName);
  98       exit(1);
  99     }
 100
 101   argc -= optind;
 102   argv += optind;
 103
 104   lastidx = 0;
 105   keylen = 0;
 106
 107   tcent = t_newconfent(tc);
 108
 109   printf("\nThis program will generate a set of parameters for the EPS\n");
 110   printf("password file.  The size of these parameters, measured in bits,\n");
 111   printf("determines the level of security offered by SRP, and is related\n");
 112   printf("to the security of similarly-sized RSA or Diffie-Hellman keys.\n");
 113   printf("Choosing a predefined field is generally preferable to generating\n");
 114   printf("a new field because clients can avoid costly parameter verification.\n");
 115   printf("Either way, the values generated by this program are public and\n");
 116   printf("can even shared between systems.\n");
 117
 118   printf("\nEnter the new field size, in bits.  Suggested sizes:\n\n");
 119   printf(" 512 (fast, minimally secure)\n");
 120   printf(" 768 (moderate security)\n");
 121   printf("1024 (most popular default)\n");
 122   printf("1536 (additional security, possibly slow)\n");
 123   printf("2048 (maximum supported security level)\n");
 124   printf("\nField size (%d to %d): ", MIN_BASIS_BITS, BASIS_BITS);
 125
 126   fgets(cbuf, sizeof(cbuf), stdin);
 127   fsize = atoi(cbuf);
 128   if(fsize < MIN_BASIS_BITS || fsize > BASIS_BITS) {
 129     fprintf(stderr, "%s: field size must be between %d and %d\n",
 130             progName, MIN_BASIS_BITS, BASIS_BITS);
 131     exit(1);
 132   }
 133
 134   if(fsize <= keylen)
 135     fprintf(stderr, "Warning: new field size is not larger than old field size\n");
 136
 137   printf("\nInitializing random number generator...");
 138   fflush(stdout);
 139   t_initrand();
 140
 141   if(composite)
 142     printf("done.\n\nGenerating a %d-bit composite with safe prime factors.  This may take a while.\n", fsize);
 143   else
 144     printf("done.\n\nGenerating a %d-bit safe prime.  This may take a while.\n", fsize);
 145
 146   while((tcent = (composite ? t_makeconfent_c(tc, fsize) :
 147                               t_makeconfent(tc, fsize))) == NULL)
 148     printf("Parameter generation failed, retrying...\n");
 149   tcent->index = lastidx + 1;
 150
 151   printf("\nParameters successfully generated.\n");
 152   printf("N = [%s]\n", t_tob64(b64buf,
 153                                tcent->modulus.data, tcent->modulus.len));
 154   printf("g = [%s]\n", t_tob64(b64buf,
 155                                tcent->generator.data, tcent->generator.len));
 156   printf("\nYou must update the pre_params array in t_getconf.c\n");
 157 }