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+1];
  45     krb5_error_code ret;
  46     krb5_enctype enctype;
  47     hdb_master_key mkey;
  48     int aret;
  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         aret = asprintf(&opt->key_file_string, "%s/m-key", hdb_db_dir(context));
  63         if (aret == -1)
  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         hdb_free_master_key(context, mkey);
  79         return 0;
  80     } else {
  81         krb5_keyblock key;
  82         krb5_salt salt;
  83         salt.salttype = KRB5_PW_SALT;
  84         /* XXX better value? */
  85         salt.saltvalue.data = NULL;
  86         salt.saltvalue.length = 0;
  87         if(opt->master_key_fd_integer != -1) {
  88             ssize_t n;
  89             n = read(opt->master_key_fd_integer, buf, sizeof(buf)-1);
  90             if(n == 0)
  91                 krb5_warnx(context, "end of file reading passphrase");
  92             else if(n < 0) {
  93                 krb5_warn(context, errno, "reading passphrase");
  94                 n = 0;
  95             }
  96             buf[n] = '\0';
  97             buf[strcspn(buf, "\r\n")] = '\0';
  98         } else if (opt->random_password_flag) {
  99             random_password (buf, sizeof(buf));
 100             printf("Using random master stash password: %s\n", buf);
 101         } else {
 102             if(UI_UTIL_read_pw_string(buf, sizeof(buf), "Master key: ",
 103                                       UI_UTIL_FLAG_VERIFY)) {
 104                 hdb_free_master_key(context, mkey);
 105                 return 0;
 106             }
 107         }
 108         ret = krb5_string_to_key_salt(context, enctype, buf, salt, &key);
 109         if (ret == 0)
 110             ret = hdb_add_master_key(context, &key, &mkey);
 111         if (ret)
 112             krb5_warn(context, errno, "setting master key");
 113         krb5_free_keyblock_contents(context, &key);
 114     }
 115
 116     {
 117         char *new = NULL, *old = NULL;
 118
 119         aret = asprintf(&old, "%s.old", opt->key_file_string);
 120         if (aret == -1) {
 121             ret = ENOMEM;
 122             goto out;
 123         }
 124         aret = asprintf(&new, "%s.new", opt->key_file_string);
 125         if (aret == -1) {
 126             ret = ENOMEM;
 127             goto out;
 128         }
 129
 130         if(unlink(new) < 0 && errno != ENOENT) {
 131             ret = errno;
 132             goto out;
 133         }
 134         krb5_warnx(context, "writing key to \"%s\"", opt->key_file_string);
 135         ret = hdb_write_master_key(context, new, mkey);
 136         if(ret)
 137             unlink(new);
 138         else {
 139             unlink(old);
 140 #ifndef NO_POSIX_LINKS
 141             if(link(opt->key_file_string, old) < 0 && errno != ENOENT) {
 142                 ret = errno;
 143                 unlink(new);
 144             } else {
 145 #endif
 146                 if(rename(new, opt->key_file_string) < 0) {
 147                     ret = errno;
 148                 }
 149 #ifndef NO_POSIX_LINKS
 150             }
 151 #endif
 152         }
 153     out:
 154         free(old);
 155         free(new);
 156         if(ret)
 157             krb5_warn(context, errno, "writing master key file");
 158     }
 159
 160     hdb_free_master_key(context, mkey);
 161     return 0;
 162 }