kadmin/ext.c

   1 /*
   2  * Copyright (c) 1997 - 2006 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 struct ext_keytab_data {
  38     krb5_keytab keytab;
  39     int random_key_flag;
  40 };
  41
  42 static int
  43 do_ext_keytab(krb5_principal principal, void *data)
  44 {
  45     krb5_error_code ret;
  46     kadm5_principal_ent_rec princ;
  47     struct ext_keytab_data *e = data;
  48     krb5_keytab_entry *keys = NULL;
  49     krb5_keyblock *k = NULL;
  50     size_t i;
  51     int n_k = 0;
  52     uint32_t mask;
  53     char *unparsed = NULL;
  54
  55     mask = KADM5_PRINCIPAL;
  56     if (!e->random_key_flag)
  57         mask |= KADM5_KVNO | KADM5_KEY_DATA;
  58
  59     ret = kadm5_get_principal(kadm_handle, principal, &princ, mask);
  60     if (ret)
  61         return ret;
  62
  63     ret = krb5_unparse_name(context, principal, &unparsed);
  64     if (ret)
  65         goto out;
  66
  67     if (!e->random_key_flag) {
  68         if (princ.n_key_data == 0) {
  69             krb5_warnx(context, "principal has no keys, or user lacks "
  70                        "get-keys privilege for %s", unparsed);
  71             goto out;
  72         }
  73         /*
  74          * kadmin clients and servers from master between 1.5 and 1.6
  75          * can have corrupted a principal's keys in the HDB.  If some
  76          * are bogus but not all are, then that must have happened.
  77          *
  78          * If all keys are bogus then the server may be a pre-1.6,
  79          * post-1.5 server and the client lacks get-keys privilege, or
  80          * the keys are corrupted.  We can't tell here.
  81          */
  82         if (kadm5_all_keys_are_bogus(princ.n_key_data, princ.key_data)) {
  83             krb5_warnx(context, "user lacks get-keys privilege for %s",
  84                        unparsed);
  85             goto out;
  86         }
  87         if (kadm5_some_keys_are_bogus(princ.n_key_data, princ.key_data)) {
  88             krb5_warnx(context, "some keys for %s are corrupted in the HDB",
  89                        unparsed);
  90         }
  91         keys = calloc(sizeof(*keys), princ.n_key_data);
  92         if (keys == NULL) {
  93             ret = krb5_enomem(context);
  94             goto out;
  95         }
  96         for (i = 0; i < princ.n_key_data; i++) {
  97             krb5_key_data *kd = &princ.key_data[i];
  98
  99             /* Don't extract bogus keys */
 100             if (kadm5_all_keys_are_bogus(1, kd))
 101                 continue;
 102
 103             keys[i].principal = princ.principal;
 104             keys[i].vno = kd->key_data_kvno;
 105             keys[i].keyblock.keytype = kd->key_data_type[0];
 106             keys[i].keyblock.keyvalue.length = kd->key_data_length[0];
 107             keys[i].keyblock.keyvalue.data = kd->key_data_contents[0];
 108             keys[i].timestamp = time(NULL);
 109             n_k++;
 110         }
 111     } else if (e->random_key_flag) {
 112         ret = kadm5_randkey_principal(kadm_handle, principal, &k, &n_k);
 113         if (ret)
 114             goto out;
 115
 116         keys = calloc(sizeof(*keys), n_k);
 117         if (keys == NULL) {
 118             ret = krb5_enomem(context);
 119             goto out;
 120         }
 121         for (i = 0; i < n_k; i++) {
 122             keys[i].principal = principal;
 123             keys[i].vno = princ.kvno + 1; /* XXX get entry again */
 124             keys[i].keyblock = k[i];
 125             keys[i].timestamp = time(NULL);
 126         }
 127     }
 128
 129     if (n_k == 0)
 130         krb5_warn(context, ret, "no keys written to keytab for %s", unparsed);
 131
 132     for (i = 0; i < n_k; i++) {
 133         ret = krb5_kt_add_entry(context, e->keytab, &keys[i]);
 134         if (ret)
 135             krb5_warn(context, ret, "krb5_kt_add_entry(%lu)", (unsigned long)i);
 136     }
 137
 138   out:
 139     kadm5_free_principal_ent(kadm_handle, &princ);
 140     if (k) {
 141         for (i = 0; i < n_k; i++)
 142             memset(k[i].keyvalue.data, 0, k[i].keyvalue.length);
 143         free(k);
 144     }
 145     free(unparsed);
 146     free(keys);
 147     return 0;
 148 }
 149
 150 int
 151 ext_keytab(struct ext_keytab_options *opt, int argc, char **argv)
 152 {
 153     krb5_error_code ret;
 154     int i;
 155     struct ext_keytab_data data;
 156
 157     if (opt->keytab_string == NULL)
 158         ret = krb5_kt_default(context, &data.keytab);
 159     else
 160         ret = krb5_kt_resolve(context, opt->keytab_string, &data.keytab);
 161
 162     if(ret){
 163         krb5_warn(context, ret, "krb5_kt_resolve");
 164         return 1;
 165     }
 166
 167     data.random_key_flag = opt->random_key_flag;
 168
 169     for(i = 0; i < argc; i++) {
 170         ret = foreach_principal(argv[i], do_ext_keytab, "ext", &data);
 171         if (ret)
 172             break;
 173     }
 174
 175     krb5_kt_close(context, data.keytab);
 176
 177     return ret != 0;
 178 }