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 keep;
  40     int random_key_flag;
  41     size_t nkstuple;
  42     krb5_key_salt_tuple *kstuple;
  43     void *kadm_handle;
  44 };
  45
  46 static int
  47 do_ext_keytab(krb5_principal principal, void *data)
  48 {
  49     krb5_error_code ret;
  50     kadm5_principal_ent_rec princ;
  51     struct ext_keytab_data *e = data;
  52     krb5_keytab_entry *keys = NULL;
  53     krb5_keyblock *k = NULL;
  54     size_t i;
  55     int n_k = 0;
  56     uint32_t mask;
  57     char *unparsed = NULL;
  58
  59     mask = KADM5_PRINCIPAL;
  60     if (!e->random_key_flag)
  61         mask |= KADM5_KVNO | KADM5_KEY_DATA;
  62
  63     ret = kadm5_get_principal(e->kadm_handle, principal, &princ, mask);
  64     if (ret)
  65         return ret;
  66
  67     ret = krb5_unparse_name(context, principal, &unparsed);
  68     if (ret)
  69         goto out;
  70
  71     if (!e->random_key_flag) {
  72         if (princ.n_key_data == 0) {
  73             krb5_warnx(context, "principal has no keys, or user lacks "
  74                        "get-keys privilege for %s", unparsed);
  75             goto out;
  76         }
  77         /*
  78          * kadmin clients and servers from master between 1.5 and 1.6
  79          * can have corrupted a principal's keys in the HDB.  If some
  80          * are bogus but not all are, then that must have happened.
  81          *
  82          * If all keys are bogus then the server may be a pre-1.6,
  83          * post-1.5 server and the client lacks get-keys privilege, or
  84          * the keys are corrupted.  We can't tell here.
  85          */
  86         if (kadm5_all_keys_are_bogus(princ.n_key_data, princ.key_data)) {
  87             krb5_warnx(context, "user lacks get-keys privilege for %s",
  88                        unparsed);
  89             goto out;
  90         }
  91         if (kadm5_some_keys_are_bogus(princ.n_key_data, princ.key_data)) {
  92             krb5_warnx(context, "some keys for %s are corrupted in the HDB",
  93                        unparsed);
  94         }
  95         keys = calloc(sizeof(*keys), princ.n_key_data);
  96         if (keys == NULL) {
  97             ret = krb5_enomem(context);
  98             goto out;
  99         }
 100         for (i = 0; i < princ.n_key_data; i++) {
 101             krb5_key_data *kd = &princ.key_data[i];
 102
 103             /* Don't extract bogus keys */
 104             if (kadm5_all_keys_are_bogus(1, kd))
 105                 continue;
 106
 107             keys[i].principal = princ.principal;
 108             keys[i].vno = kd->key_data_kvno;
 109             keys[i].keyblock.keytype = kd->key_data_type[0];
 110             keys[i].keyblock.keyvalue.length = kd->key_data_length[0];
 111             keys[i].keyblock.keyvalue.data = kd->key_data_contents[0];
 112             keys[i].timestamp = time(NULL);
 113             n_k++;
 114         }
 115     } else if (e->random_key_flag) {
 116         ret = kadm5_randkey_principal_3(e->kadm_handle, principal, e->keep,
 117                                         e->nkstuple, e->kstuple, &k, &n_k);
 118         if (ret)
 119             goto out;
 120
 121         keys = calloc(sizeof(*keys), n_k);
 122         if (keys == NULL) {
 123             ret = krb5_enomem(context);
 124             goto out;
 125         }
 126         for (i = 0; i < n_k; i++) {
 127             keys[i].principal = principal;
 128             keys[i].vno = princ.kvno + 1; /* XXX get entry again */
 129             keys[i].keyblock = k[i];
 130             keys[i].timestamp = time(NULL);
 131         }
 132     }
 133
 134     if (n_k == 0)
 135         krb5_warn(context, ret, "no keys written to keytab for %s", unparsed);
 136
 137     for (i = 0; i < n_k; i++) {
 138         ret = krb5_kt_add_entry(context, e->keytab, &keys[i]);
 139         if (ret)
 140             krb5_warn(context, ret, "krb5_kt_add_entry(%lu)", (unsigned long)i);
 141     }
 142
 143   out:
 144     kadm5_free_principal_ent(e->kadm_handle, &princ);
 145     if (k) {
 146         for (i = 0; i < n_k; i++)
 147             memset(k[i].keyvalue.data, 0, k[i].keyvalue.length);
 148         free(k);
 149     }
 150     free(unparsed);
 151     free(keys);
 152     return ret;
 153 }
 154
 155 int
 156 ext_keytab(struct ext_keytab_options *opt, int argc, char **argv)
 157 {
 158     krb5_error_code ret;
 159     struct ext_keytab_data data;
 160     const char *enctypes;
 161     size_t i;
 162
 163     data.kadm_handle = NULL;
 164     ret = kadm5_dup_context(kadm_handle, &data.kadm_handle);
 165     if (ret)
 166         krb5_err(context, 1, ret, "Could not duplicate kadmin connection");
 167     data.random_key_flag = opt->random_key_flag;
 168     data.keep = 1;
 169     i = 0;
 170     if (opt->keepallold_flag) {
 171         data.keep = 2;
 172         i++;
 173     }
 174     if (opt->keepold_flag) {
 175         data.keep = 1;
 176         i++;
 177     }
 178     if (opt->pruneall_flag) {
 179         data.keep = 0;
 180         i++;
 181     }
 182     if (i > 1) {
 183         fprintf(stderr,
 184                 "use only one of --keepold, --keepallold, or --pruneall\n");
 185         return EINVAL;
 186     }
 187
 188     if (opt->keytab_string == NULL)
 189         ret = krb5_kt_default(context, &data.keytab);
 190     else
 191         ret = krb5_kt_resolve(context, opt->keytab_string, &data.keytab);
 192
 193     if(ret){
 194         krb5_warn(context, ret, "krb5_kt_resolve");
 195         return 1;
 196     }
 197     enctypes = opt->enctypes_string;
 198     if (enctypes == NULL || enctypes[0] == '\0')
 199         enctypes = krb5_config_get_string(context, NULL, "libdefaults",
 200                                           "supported_enctypes", NULL);
 201     if (enctypes == NULL || enctypes[0] == '\0')
 202         enctypes = "aes128-cts-hmac-sha1-96";
 203     ret = krb5_string_to_keysalts2(context, enctypes, &data.nkstuple,
 204                                    &data.kstuple);
 205     if (ret) {
 206         fprintf(stderr, "enctype(s) unknown\n");
 207         krb5_kt_close(context, data.keytab);
 208         return ret;
 209     }
 210
 211     for(i = 0; i < argc; i++) {
 212         ret = foreach_principal(argv[i], do_ext_keytab, "ext", &data);
 213         if (ret)
 214             break;
 215     }
 216
 217     kadm5_destroy(data.kadm_handle);
 218     krb5_kt_close(context, data.keytab);
 219     free(data.kstuple);
 220     return ret != 0;
 221 }