kadmin/stash.c

   1 /*
   2  * Copyright (c) 2004 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Portions Copyright (c) 2009 Apple Inc. 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 "kadmin_locl.h"
  37 #include "kadmin-commands.h"
  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 if (opt->random_password_flag) {
  97             random_password (buf, sizeof(buf));
  98             printf("Using random master stash password: %s\n", buf);
  99         } else {
 100             if(UI_UTIL_read_pw_string(buf, sizeof(buf), "Master key: ", 1)) {
 101                 hdb_free_master_key(context, mkey);
 102                 return 0;
 103             }
 104         }
 105         ret = krb5_string_to_key_salt(context, enctype, buf, salt, &key);
 106         ret = hdb_add_master_key(context, &key, &mkey);
 107         krb5_free_keyblock_contents(context, &key);
 108     }
 109
 110     {
 111         char *new, *old;
 112         asprintf(&old, "%s.old", opt->key_file_string);
 113         asprintf(&new, "%s.new", opt->key_file_string);
 114         if(old == NULL || new == NULL) {
 115             ret = ENOMEM;
 116             goto out;
 117         }
 118
 119         if(unlink(new) < 0 && errno != ENOENT) {
 120             ret = errno;
 121             goto out;
 122         }
 123         krb5_warnx(context, "writing key to \"%s\"", opt->key_file_string);
 124         ret = hdb_write_master_key(context, new, mkey);
 125         if(ret)
 126             unlink(new);
 127         else {
 128             unlink(old);
 129 #ifndef NO_POSIX_LINKS
 130             if(link(opt->key_file_string, old) < 0 && errno != ENOENT) {
 131                 ret = errno;
 132                 unlink(new);
 133             } else {
 134 #endif
 135                 if(rename(new, opt->key_file_string) < 0) {
 136                     ret = errno;
 137                 }
 138 #ifndef NO_POSIX_LINKS
 139             }
 140 #endif
 141         }
 142     out:
 143         free(old);
 144         free(new);
 145         if(ret)
 146             krb5_warn(context, errno, "writing master key file");
 147     }
 148
 149     hdb_free_master_key(context, mkey);
 150     return 0;
 151 }