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