crypto/external/bsd/heimdal/dist/kdc/kstash.c

   1 /*      $NetBSD: kstash.c,v 1.1.1.2 2014/04/24 12:45:27 pettai Exp $    */
   2
   3 /*
   4  * Copyright (c) 1997-2004 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "headers.h"
  37
  38 krb5_context context;
  39
  40 static char *keyfile;
  41 static int convert_flag;
  42 static int help_flag;
  43 static int version_flag;
  44
  45 static int master_key_fd = -1;
  46 static int random_key_flag;
  47
  48 static const char *enctype_str = "des3-cbc-sha1";
  49
  50 static struct getargs args[] = {
  51     { "enctype", 'e', arg_string, rk_UNCONST(&enctype_str), "encryption type",
  52         NULL },
  53     { "key-file", 'k', arg_string, &keyfile, "master key file", "file" },
  54     { "convert-file", 0, arg_flag, &convert_flag,
  55       "just convert keyfile to new format", NULL },
  56     { "master-key-fd", 0, arg_integer, &master_key_fd,
  57       "filedescriptor to read passphrase from", "fd" },
  58     { "random-key", 0, arg_flag, &random_key_flag,
  59         "generate a random master key", NULL },
  60     { "help", 'h', arg_flag, &help_flag, NULL, NULL },
  61     { "version", 0, arg_flag, &version_flag, NULL, NULL }
  62 };
  63
  64 int num_args = sizeof(args) / sizeof(args[0]);
  65
  66 int
  67 main(int argc, char **argv)
  68 {
  69     char buf[1024];
  70     krb5_error_code ret;
  71
  72     krb5_enctype enctype;
  73
  74     hdb_master_key mkey;
  75
  76     krb5_program_setup(&context, argc, argv, args, num_args, NULL);
  77
  78     if(help_flag)
  79         krb5_std_usage(0, args, num_args);
  80     if(version_flag){
  81         print_version(NULL);
  82         exit(0);
  83     }
  84
  85     if (master_key_fd != -1 && random_key_flag)
  86         krb5_errx(context, 1, "random-key and master-key-fd "
  87                   "is mutual exclusive");
  88
  89     if (keyfile == NULL)
  90         asprintf(&keyfile, "%s/m-key", hdb_db_dir(context));
  91
  92     ret = krb5_string_to_enctype(context, enctype_str, &enctype);
  93     if(ret)
  94         krb5_err(context, 1, ret, "krb5_string_to_enctype");
  95
  96     ret = hdb_read_master_key(context, keyfile, &mkey);
  97     if(ret && ret != ENOENT)
  98         krb5_err(context, 1, ret, "reading master key from %s", keyfile);
  99
 100     if (convert_flag) {
 101         if (ret)
 102             krb5_err(context, 1, ret, "reading master key from %s", keyfile);
 103     } else {
 104         krb5_keyblock key;
 105         krb5_salt salt;
 106         salt.salttype = KRB5_PW_SALT;
 107         /* XXX better value? */
 108         salt.saltvalue.data = NULL;
 109         salt.saltvalue.length = 0;
 110         if (random_key_flag) {
 111             ret = krb5_generate_random_keyblock(context, enctype, &key);
 112             if (ret)
 113                 krb5_err(context, 1, ret, "krb5_generate_random_keyblock");
 114
 115         } else {
 116             if(master_key_fd != -1) {
 117                 ssize_t n;
 118                 n = read(master_key_fd, buf, sizeof(buf));
 119                 if(n <= 0)
 120                     krb5_err(context, 1, errno, "failed to read passphrase");
 121                 buf[n] = '\0';
 122                 buf[strcspn(buf, "\r\n")] = '\0';
 123
 124             } else {
 125                 if(UI_UTIL_read_pw_string(buf, sizeof(buf), "Master key: ", 1))
 126                     exit(1);
 127             }
 128             krb5_string_to_key_salt(context, enctype, buf, salt, &key);
 129         }
 130         ret = hdb_add_master_key(context, &key, &mkey);
 131
 132         krb5_free_keyblock_contents(context, &key);
 133
 134     }
 135
 136     {
 137         char *new, *old;
 138         asprintf(&old, "%s.old", keyfile);
 139         asprintf(&new, "%s.new", keyfile);
 140         if(unlink(new) < 0 && errno != ENOENT) {
 141             ret = errno;
 142             goto out;
 143         }
 144         krb5_warnx(context, "writing key to `%s'", keyfile);
 145         ret = hdb_write_master_key(context, new, mkey);
 146         if(ret)
 147             unlink(new);
 148         else {
 149 #ifndef NO_POSIX_LINKS
 150             unlink(old);
 151             if(link(keyfile, old) < 0 && errno != ENOENT) {
 152                 ret = errno;
 153                 unlink(new);
 154             } else {
 155 #endif
 156                 if(rename(new, keyfile) < 0) {
 157                     ret = errno;
 158                 }
 159 #ifndef NO_POSIX_LINKS
 160             }
 161 #endif
 162         }
 163     out:
 164         free(old);
 165         free(new);
 166         if(ret)
 167             krb5_warn(context, errno, "writing master key file");
 168     }
 169
 170     hdb_free_master_key(context, mkey);
 171
 172     exit(ret != 0);
 173 }