crypto/dist/heimdal/kadmin/stash.c

   1 /*
   2  * Copyright (c) 2004 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "kadmin_locl.h"
  35 #include "kadmin-commands.h"
  36
  37 __RCSID("$Heimdal: stash.c 22251 2007-12-09 05:58:43Z lha $"
  38         "$NetBSD: stash.c,v 1.1 2008/03/22 08:37:02 mlelstv Exp $");
  39
  40 extern int local_flag;
  41
  42 int
  43 stash(struct stash_options *opt, int argc, char **argv)
  44 {
  45     char buf[1024];
  46     krb5_error_code ret;
  47     krb5_enctype enctype;
  48     hdb_master_key mkey;
  49
  50     if(!local_flag) {
  51         krb5_warnx(context, "stash is only available in local (-l) mode");
  52         return 0;
  53     }
  54
  55     ret = krb5_string_to_enctype(context, opt->enctype_string, &enctype);
  56     if(ret) {
  57         krb5_warn(context, ret, "%s", opt->enctype_string);
  58         return 0;
  59     }
  60
  61     if(opt->key_file_string == NULL) {
  62         asprintf(&opt->key_file_string, "%s/m-key", hdb_db_dir(context));
  63         if (opt->key_file_string == NULL)
  64             errx(1, "out of memory");
  65     }
  66
  67     ret = hdb_read_master_key(context, opt->key_file_string, &mkey);
  68     if(ret && ret != ENOENT) {
  69         krb5_warn(context, ret, "reading master key from %s",
  70                   opt->key_file_string);
  71         return 0;
  72     }
  73
  74     if (opt->convert_file_flag) {
  75         if (ret)
  76             krb5_warn(context, ret, "reading master key from %s",
  77                       opt->key_file_string);
  78         return 0;
  79     } else {
  80         krb5_keyblock key;
  81         krb5_salt salt;
  82         salt.salttype = KRB5_PW_SALT;
  83         /* XXX better value? */
  84         salt.saltvalue.data = NULL;
  85         salt.saltvalue.length = 0;
  86         if(opt->master_key_fd_integer != -1) {
  87             ssize_t n;
  88             n = read(opt->master_key_fd_integer, buf, sizeof(buf));
  89             if(n == 0)
  90                 krb5_warnx(context, "end of file reading passphrase");
  91             else if(n < 0) {
  92                 krb5_warn(context, errno, "reading passphrase");
  93                 n = 0;
  94             }
  95             buf[n] = '\0';
  96             buf[strcspn(buf, "\r\n")] = '\0';
  97         } else {
  98             if(UI_UTIL_read_pw_string(buf, sizeof(buf), "Master key: ", 1)) {
  99                 hdb_free_master_key(context, mkey);
 100                 return 0;
 101             }
 102         }
 103         ret = krb5_string_to_key_salt(context, enctype, buf, salt, &key);
 104         ret = hdb_add_master_key(context, &key, &mkey);
 105         krb5_free_keyblock_contents(context, &key);
 106     }
 107
 108     {
 109         char *new, *old;
 110         asprintf(&old, "%s.old", opt->key_file_string);
 111         asprintf(&new, "%s.new", opt->key_file_string);
 112         if(old == NULL || new == NULL) {
 113             ret = ENOMEM;
 114             goto out;
 115         }
 116
 117         if(unlink(new) < 0 && errno != ENOENT) {
 118             ret = errno;
 119             goto out;
 120         }
 121         krb5_warnx(context, "writing key to \"%s\"", opt->key_file_string);
 122         ret = hdb_write_master_key(context, new, mkey);
 123         if(ret)
 124             unlink(new);
 125         else {
 126             unlink(old);
 127             if(link(opt->key_file_string, old) < 0 && errno != ENOENT) {
 128                 ret = errno;
 129                 unlink(new);
 130             } else if(rename(new, opt->key_file_string) < 0) {
 131                 ret = errno;
 132             }
 133         }
 134     out:
 135         free(old);
 136         free(new);
 137         if(ret)
 138             krb5_warn(context, errno, "writing master key file");
 139     }
 140
 141     hdb_free_master_key(context, mkey);
 142     return 0;
 143 }