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("$Id$");
  38
  39 extern int local_flag;
  40
  41 int
  42 stash(struct stash_options *opt, int argc, char **argv)
  43 {
  44     char buf[1024];
  45     krb5_error_code ret;
  46     krb5_enctype enctype;
  47     hdb_master_key mkey;
  48
  49     if(!local_flag) {
  50         krb5_warnx(context, "stash is only available in local (-l) mode");
  51         return 0;
  52     }
  53
  54     ret = krb5_string_to_enctype(context, opt->enctype_string, &enctype);
  55     if(ret) {
  56         krb5_warn(context, ret, "%s", opt->enctype_string);
  57         return 0;
  58     }
  59
  60     if(opt->key_file_string == NULL) {
  61         asprintf(&opt->key_file_string, "%s/m-key", hdb_db_dir(context));
  62         if (opt->key_file_string == NULL)
  63             errx(1, "out of memory");
  64     }
  65
  66     ret = hdb_read_master_key(context, opt->key_file_string, &mkey);
  67     if(ret && ret != ENOENT) {
  68         krb5_warn(context, ret, "reading master key from %s",
  69                   opt->key_file_string);
  70         return 0;
  71     }
  72
  73     if (opt->convert_file_flag) {
  74         if (ret)
  75             krb5_warn(context, ret, "reading master key from %s",
  76                       opt->key_file_string);
  77         return 0;
  78     } else {
  79         krb5_keyblock key;
  80         krb5_salt salt;
  81         salt.salttype = KRB5_PW_SALT;
  82         /* XXX better value? */
  83         salt.saltvalue.data = NULL;
  84         salt.saltvalue.length = 0;
  85         if(opt->master_key_fd_integer != -1) {
  86             ssize_t n;
  87             n = read(opt->master_key_fd_integer, buf, sizeof(buf));
  88             if(n == 0)
  89                 krb5_warnx(context, "end of file reading passphrase");
  90             else if(n < 0) {
  91                 krb5_warn(context, errno, "reading passphrase");
  92                 n = 0;
  93             }
  94             buf[n] = '\0';
  95             buf[strcspn(buf, "\r\n")] = '\0';
  96         } else {
  97             if(UI_UTIL_read_pw_string(buf, sizeof(buf), "Master key: ", 1)) {
  98                 hdb_free_master_key(context, mkey);
  99                 return 0;
 100             }
 101         }
 102         ret = krb5_string_to_key_salt(context, enctype, buf, salt, &key);
 103         ret = hdb_add_master_key(context, &key, &mkey);
 104         krb5_free_keyblock_contents(context, &key);
 105     }
 106
 107     {
 108         char *new, *old;
 109         asprintf(&old, "%s.old", opt->key_file_string);
 110         asprintf(&new, "%s.new", opt->key_file_string);
 111         if(old == NULL || new == NULL) {
 112             ret = ENOMEM;
 113             goto out;
 114         }
 115
 116         if(unlink(new) < 0 && errno != ENOENT) {
 117             ret = errno;
 118             goto out;
 119         }
 120         krb5_warnx(context, "writing key to \"%s\"", opt->key_file_string);
 121         ret = hdb_write_master_key(context, new, mkey);
 122         if(ret)
 123             unlink(new);
 124         else {
 125             unlink(old);
 126             if(link(opt->key_file_string, old) < 0 && errno != ENOENT) {
 127                 ret = errno;
 128                 unlink(new);
 129             } else if(rename(new, opt->key_file_string) < 0) {
 130                 ret = errno;
 131             }
 132         }
 133     out:
 134         free(old);
 135         free(new);
 136         if(ret)
 137             krb5_warn(context, errno, "writing master key file");
 138     }
 139
 140     hdb_free_master_key(context, mkey);
 141     return 0;
 142 }