source4/libnet/libnet_export_keytab.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2009
   5    Copyright (C) Andreas Schneider <asn@samba.org> 2016
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "system/kerberos.h"
  23 #include "auth/kerberos/kerberos.h"
  24 #include "kdc/samba_kdc.h"
  25 #include "libnet/libnet_export_keytab.h"
  26
  27 #include "kdc/db-glue.h"
  28 #include "kdc/sdb.h"
  29
  30 static NTSTATUS sdb_kt_copy(TALLOC_CTX *mem_ctx,
  31                             krb5_context context,
  32                             struct samba_kdc_db_context *db_ctx,
  33                             const char *keytab_name,
  34                             const char *principal,
  35                             const char **error_string)
  36 {
  37         struct sdb_entry sentry = {};
  38         krb5_keytab keytab;
  39         krb5_error_code code = 0;
  40         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
  41         char *entry_principal = NULL;
  42         bool copy_one_principal = (principal != NULL);
  43         krb5_data password;
  44
  45         code = smb_krb5_kt_open_relative(context,
  46                                          keytab_name,
  47                                          true, /* write_access */
  48                                          &keytab);
  49         if (code != 0) {
  50                 *error_string = talloc_asprintf(mem_ctx,
  51                                                 "Failed to open keytab: %s",
  52                                                 keytab_name);
  53                 status = NT_STATUS_NO_SUCH_FILE;
  54                 goto done;
  55         }
  56
  57         if (copy_one_principal) {
  58                 krb5_principal k5_princ;
  59
  60                 code = smb_krb5_parse_name(context, principal, &k5_princ);
  61                 if (code != 0) {
  62                         *error_string = smb_get_krb5_error_message(context,
  63                                                                    code,
  64                                                                    mem_ctx);
  65                         status = NT_STATUS_UNSUCCESSFUL;
  66                         goto done;
  67                 }
  68
  69                 code = samba_kdc_fetch(context, db_ctx, k5_princ,
  70                                        SDB_F_GET_ANY | SDB_F_ADMIN_DATA,
  71                                        0, &sentry);
  72
  73                 krb5_free_principal(context, k5_princ);
  74         } else {
  75                 code = samba_kdc_firstkey(context, db_ctx, &sentry);
  76         }
  77
  78         for (; code == 0; code = samba_kdc_nextkey(context, db_ctx, &sentry)) {
  79                 int i;
  80
  81                 code = krb5_unparse_name(context,
  82                                          sentry.principal,
  83                                          &entry_principal);
  84                 if (code != 0) {
  85                         *error_string = smb_get_krb5_error_message(context,
  86                                                                    code,
  87                                                                    mem_ctx);
  88                         status = NT_STATUS_UNSUCCESSFUL;
  89                         goto done;
  90                 }
  91
  92                 if (sentry.keys.len == 0) {
  93                         SAFE_FREE(entry_principal);
  94                         sdb_entry_free(&sentry);
  95
  96                         continue;
  97                 }
  98
  99                 for (i = 0; i < sentry.keys.len; i++) {
 100                         struct sdb_key *s = &(sentry.keys.val[i]);
 101                         krb5_enctype enctype;
 102
 103                         enctype = KRB5_KEY_TYPE(&(s->key));
 104                         password.length = KRB5_KEY_LENGTH(&s->key);
 105                         password.data = (char *)KRB5_KEY_DATA(&s->key);
 106
 107                         DBG_INFO("smb_krb5_kt_add_entry for enctype=0x%04x\n",
 108                                   (int)enctype);
 109                         code = smb_krb5_kt_add_entry(context,
 110                                                      keytab,
 111                                                      sentry.kvno,
 112                                                      entry_principal,
 113                                                      NULL,
 114                                                      enctype,
 115                                                      &password,
 116                                                      true);    /* no_salt */
 117                         if (code != 0) {
 118                                 status = NT_STATUS_UNSUCCESSFUL;
 119                                 *error_string = smb_get_krb5_error_message(context,
 120                                                                            code,
 121                                                                            mem_ctx);
 122                                 DEBUG(0, ("smb_krb5_kt_add_entry failed code=%d, error = %s\n",
 123                                           code, *error_string));
 124                                 goto done;
 125                         }
 126                 }
 127
 128                 if (copy_one_principal) {
 129                         break;
 130                 }
 131
 132                 SAFE_FREE(entry_principal);
 133                 sdb_entry_free(&sentry);
 134         }
 135
 136         if (code != 0 && code != SDB_ERR_NOENTRY) {
 137                 *error_string = smb_get_krb5_error_message(context,
 138                                                            code,
 139                                                            mem_ctx);
 140                 status = NT_STATUS_NO_SUCH_USER;
 141                 goto done;
 142         }
 143
 144         status = NT_STATUS_OK;
 145 done:
 146         SAFE_FREE(entry_principal);
 147         sdb_entry_free(&sentry);
 148
 149         return status;
 150 }
 151
 152 NTSTATUS libnet_export_keytab(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, struct libnet_export_keytab *r)
 153 {
 154         krb5_error_code ret;
 155         struct smb_krb5_context *smb_krb5_context;
 156         struct samba_kdc_base_context *base_ctx;
 157         struct samba_kdc_db_context *db_ctx = NULL;
 158         const char *error_string = NULL;
 159         NTSTATUS status;
 160
 161         ret = smb_krb5_init_context(ctx, ctx->lp_ctx, &smb_krb5_context);
 162         if (ret) {
 163                 return NT_STATUS_NO_MEMORY;
 164         }
 165
 166         base_ctx = talloc_zero(mem_ctx, struct samba_kdc_base_context);
 167         if (base_ctx == NULL) {
 168                 return NT_STATUS_NO_MEMORY;
 169         }
 170
 171         base_ctx->ev_ctx = ctx->event_ctx;
 172         base_ctx->lp_ctx = ctx->lp_ctx;
 173
 174         status = samba_kdc_setup_db_ctx(mem_ctx, base_ctx, &db_ctx);
 175         if (!NT_STATUS_IS_OK(status)) {
 176                 return status;
 177         }
 178
 179         if (r->in.principal != NULL) {
 180                 DEBUG(0, ("Export one principal to %s\n", r->in.keytab_name));
 181                 status = sdb_kt_copy(mem_ctx,
 182                                      smb_krb5_context->krb5_context,
 183                                      db_ctx,
 184                                      r->in.keytab_name,
 185                                      r->in.principal,
 186                                      &error_string);
 187         } else {
 188                 unlink(r->in.keytab_name);
 189                 DEBUG(0, ("Export complete keytab to %s\n", r->in.keytab_name));
 190                 status = sdb_kt_copy(mem_ctx,
 191                                      smb_krb5_context->krb5_context,
 192                                      db_ctx,
 193                                      r->in.keytab_name,
 194                                      NULL,
 195                                      &error_string);
 196         }
 197
 198         talloc_free(db_ctx);
 199         talloc_free(base_ctx);
 200
 201         if (!NT_STATUS_IS_OK(status)) {
 202                 r->out.error_string = error_string;
 203         }
 204
 205         return status;
 206 }