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 };
  40
  41 static int
  42 do_ext_keytab(krb5_principal principal, void *data)
  43 {
  44     krb5_error_code ret;
  45     kadm5_principal_ent_rec princ;
  46     struct ext_keytab_data *e = data;
  47     krb5_keytab_entry *keys = NULL;
  48     krb5_keyblock *k = NULL;
  49     size_t i;
  50     int n_k = 0;
  51     char *unparsed = NULL;
  52
  53     ret = kadm5_get_principal(kadm_handle, principal, &princ,
  54                               KADM5_PRINCIPAL|KADM5_KVNO|KADM5_KEY_DATA);
  55     if (ret)
  56         return ret;
  57
  58     ret = krb5_unparse_name(context, principal, &unparsed);
  59     if (ret)
  60         goto out;
  61
  62     if (princ.n_key_data) {
  63         keys = calloc(sizeof(*keys), princ.n_key_data);
  64         if (keys == NULL) {
  65             ret = krb5_enomem(context);
  66             goto out;
  67         }
  68         for (i = 0; i < princ.n_key_data; i++) {
  69             krb5_key_data *kd = &princ.key_data[i];
  70             int warned = 0;
  71
  72             /*
  73              * If the kadm5 client princ lacks get-keys then it may get
  74              * bogus keys four bytes long.
  75              */
  76             if ((kd->key_data_length[0] == sizeof (KADM5_BOGUS_KEY_DATA) - 1)
  77                  && (ct_memcmp(kd->key_data_contents[0], KADM5_BOGUS_KEY_DATA,
  78                                kd->key_data_length[0]) == 0)) {
  79                 if (!warned) {
  80                     krb5_warnx(context, "user lacks get-keys privilege for %s",
  81                                unparsed);
  82                     warned = 1;
  83                 }
  84                 continue;
  85             }
  86
  87             keys[i].principal = princ.principal;
  88             keys[i].vno = kd->key_data_kvno;
  89             keys[i].keyblock.keytype = kd->key_data_type[0];
  90             keys[i].keyblock.keyvalue.length = kd->key_data_length[0];
  91             keys[i].keyblock.keyvalue.data = kd->key_data_contents[0];
  92             keys[i].timestamp = time(NULL);
  93             n_k++;
  94         }
  95     }
  96
  97     if (n_k == 0) {
  98         /* Probably lack get-keys privilege, but we may be able to set keys */
  99         ret = kadm5_randkey_principal(kadm_handle, principal, &k, &n_k);
 100         if (ret)
 101             goto out;
 102
 103         keys = calloc(sizeof(*keys), n_k);
 104         if (keys == NULL) {
 105             ret = krb5_enomem(context);
 106             goto out;
 107         }
 108         for (i = 0; i < n_k; i++) {
 109             keys[i].principal = principal;
 110             keys[i].vno = princ.kvno + 1; /* XXX get entry again */
 111             keys[i].keyblock = k[i];
 112             keys[i].timestamp = time(NULL);
 113         }
 114     }
 115
 116     for (i = 0; i < n_k; i++) {
 117         ret = krb5_kt_add_entry(context, e->keytab, &keys[i]);
 118         if (ret)
 119             krb5_warn(context, ret, "krb5_kt_add_entry(%lu)", (unsigned long)i);
 120     }
 121
 122   out:
 123     kadm5_free_principal_ent(kadm_handle, &princ);
 124     if (k) {
 125         memset(k, 0, n_k * sizeof(*k));
 126         free(k);
 127     }
 128     free(unparsed);
 129     free(keys);
 130     return 0;
 131 }
 132
 133 int
 134 ext_keytab(struct ext_keytab_options *opt, int argc, char **argv)
 135 {
 136     krb5_error_code ret;
 137     int i;
 138     struct ext_keytab_data data;
 139
 140     if (opt->keytab_string == NULL)
 141         ret = krb5_kt_default(context, &data.keytab);
 142     else
 143         ret = krb5_kt_resolve(context, opt->keytab_string, &data.keytab);
 144
 145     if(ret){
 146         krb5_warn(context, ret, "krb5_kt_resolve");
 147         return 1;
 148     }
 149
 150     for(i = 0; i < argc; i++) {
 151         ret = foreach_principal(argv[i], do_ext_keytab, "ext", &data);
 152         if (ret)
 153             break;
 154     }
 155
 156     krb5_kt_close(context, data.keytab);
 157
 158     return ret != 0;
 159 }