login_passwd/pwd_gensalt.c

   1 /*      $OpenBSD: pwd_gensalt.c,v 1.29 2014/11/01 17:48:00 tedu Exp $ */
   2
   3 /*
   4  * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Niels Provos.
  18  * 4. The name of the author may not be used to endorse or promote products
  19  *    derived from this software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/types.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <err.h>
  38 #include <grp.h>
  39 #include <pwd.h>
  40 #include <time.h>
  41 #include <login_cap.h>
  42
  43 void    to64(char *, u_int32_t, int n);
  44 int     pwd_gensalt(char *, int, login_cap_t *, char);
  45
  46 #define CIPHER_DEF              "blowfish,8"
  47
  48 int
  49 pwd_gensalt(char *salt, int saltlen, login_cap_t *lc, char type)
  50 {
  51         char *next, *now, *oldnext;
  52
  53         *salt = '\0';
  54
  55         next = login_getcapstr(lc, "localcipher", NULL, NULL);
  56         if (next == NULL && (next = strdup(CIPHER_DEF)) == NULL) {
  57                 warn(NULL);
  58                 return 0;
  59         }
  60
  61         oldnext = next;
  62         now = strsep(&next, ",");
  63         if (!strcmp(now, "blowfish")) {
  64                 int rounds = 8;
  65
  66                 if (next)
  67                         rounds = atoi(next);
  68                 if (rounds < 4)
  69                         rounds = 4;
  70                 if (rounds > 31)
  71                         rounds = 31;
  72                 strlcpy(salt, bcrypt_gensalt(rounds), saltlen);
  73         } else {
  74                 warnx("Unknown option %s.", now);
  75                 free(oldnext);
  76                 return 0;
  77         }
  78         free(oldnext);
  79         return 1;
  80 }
  81
  82 static unsigned char itoa64[] =  /* 0 ... 63 => ascii - 64 */
  83         "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
  84
  85 void
  86 to64(char *s, u_int32_t v, int n)
  87 {
  88         while (--n >= 0) {
  89                 *s++ = itoa64[v&0x3f];
  90                 v >>= 6;
  91         }
  92 }