lib/libcrypt/crypt.c

   1 /*
   2  * Copyright (c) 1999
   3  *      Mark Murray.  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 MARK MURRAY 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 MARK MURRAY 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  * $FreeBSD: src/lib/libcrypt/crypt.c,v 1.14.2.2 2001/05/24 12:20:02 markm Exp $
  27  * $DragonFly: src/lib/libcrypt/crypt.c,v 1.3 2005/08/04 17:27:09 drhodus Exp $
  28  */
  29
  30 #include <sys/types.h>
  31 #include <string.h>
  32 #include <libutil.h>
  33 #include "crypt.h"
  34
  35 static const struct {
  36         const char *const name;
  37         char *(*const func)(const char *, const char *);
  38         const char *const magic;
  39 } crypt_types[] = {
  40 #ifdef HAS_DES
  41         {
  42                 "des",
  43                 crypt_des,
  44                 NULL
  45         },
  46 #endif
  47         {
  48                 "md5",
  49                 crypt_md5,
  50                 "$1$"
  51         },
  52 #ifdef HAS_BLOWFISH
  53         {
  54                 "blf",
  55                 crypt_blowfish,
  56                 "$2"
  57         },
  58 #endif
  59         {
  60                 NULL,
  61                 NULL
  62         }
  63 };
  64
  65 static int crypt_type = -1;
  66
  67 static void
  68 crypt_setdefault(void)
  69 {
  70         char *def;
  71         int i;
  72
  73         if (crypt_type != -1)
  74                 return;
  75         def = auth_getval("crypt_default");
  76         if (def == NULL) {
  77                 crypt_type = 0;
  78                 return;
  79         }
  80         for (i = 0; i < sizeof(crypt_types) / sizeof(crypt_types[0]) - 1; i++) {
  81                 if (strcmp(def, crypt_types[i].name) == 0) {
  82                         crypt_type = i;
  83                         return;
  84                 }
  85         }
  86         crypt_type = 0;
  87 }
  88
  89 const char *
  90 crypt_get_format(void)
  91 {
  92
  93         crypt_setdefault();
  94         return (crypt_types[crypt_type].name);
  95 }
  96
  97 int
  98 crypt_set_format(char *type)
  99 {
 100         int i;
 101
 102         crypt_setdefault();
 103         for (i = 0; i < sizeof(crypt_types) / sizeof(crypt_types[0]) - 1; i++) {
 104                 if (strcmp(type, crypt_types[i].name) == 0) {
 105                         crypt_type = i;
 106                         return (1);
 107                 }
 108         }
 109         return (0);
 110 }
 111
 112 char *
 113 crypt(char *passwd, char *salt)
 114 {
 115         int i;
 116
 117         crypt_setdefault();
 118         for (i = 0; i < sizeof(crypt_types) / sizeof(crypt_types[0]) - 1; i++) {
 119                 if (crypt_types[i].magic != NULL && strncmp(salt,
 120                     crypt_types[i].magic, strlen(crypt_types[i].magic)) == 0)
 121                         return (crypt_types[i].func(passwd, salt));
 122         }
 123         return (crypt_types[crypt_type].func(passwd, salt));
 124 }