source4/kdc/hdb-samba4.c

   1 /*
   2  * Copyright (c) 1999-2001, 2003, PADL Software Pty Ltd.
   3  * Copyright (c) 2004-2009, Andrew Bartlett <abartlet@samba.org>.
   4  * Copyright (c) 2004, Stefan Metzmacher <metze@samba.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * 3. Neither the name of PADL Software  nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include "includes.h"
  36 #include "kdc/kdc-glue.h"
  37 #include "kdc/db-glue.h"
  38 #include "auth/auth_sam.h"
  39 #include <ldb.h>
  40 #include "sdb.h"
  41 #include "sdb_hdb.h"
  42
  43 static krb5_error_code hdb_samba4_open(krb5_context context, HDB *db, int flags, mode_t mode)
  44 {
  45         if (db->hdb_master_key_set) {
  46                 krb5_error_code ret = HDB_ERR_NOENTRY;
  47                 krb5_warnx(context, "hdb_samba4_open: use of a master key incompatible with LDB\n");
  48                 krb5_set_error_message(context, ret, "hdb_samba4_open: use of a master key incompatible with LDB\n");
  49                 return ret;
  50         }
  51
  52         return 0;
  53 }
  54
  55 static krb5_error_code hdb_samba4_close(krb5_context context, HDB *db)
  56 {
  57         return 0;
  58 }
  59
  60 static krb5_error_code hdb_samba4_lock(krb5_context context, HDB *db, int operation)
  61 {
  62         return 0;
  63 }
  64
  65 static krb5_error_code hdb_samba4_unlock(krb5_context context, HDB *db)
  66 {
  67         return 0;
  68 }
  69
  70 static krb5_error_code hdb_samba4_rename(krb5_context context, HDB *db, const char *new_name)
  71 {
  72         return HDB_ERR_DB_INUSE;
  73 }
  74
  75 static krb5_error_code hdb_samba4_store(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry)
  76 {
  77         return HDB_ERR_DB_INUSE;
  78 }
  79
  80 static krb5_error_code hdb_samba4_remove(krb5_context context, HDB *db, krb5_const_principal principal)
  81 {
  82         return HDB_ERR_DB_INUSE;
  83 }
  84
  85 static krb5_error_code hdb_samba4_fetch_kvno(krb5_context context, HDB *db,
  86                                              krb5_const_principal principal,
  87                                              unsigned flags,
  88                                              krb5_kvno kvno,
  89                                              hdb_entry_ex *entry_ex)
  90 {
  91         struct samba_kdc_db_context *kdc_db_ctx;
  92         struct sdb_entry_ex sdb_entry_ex = {};
  93         krb5_error_code code, ret;
  94
  95         kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
  96                                            struct samba_kdc_db_context);
  97
  98         ret = samba_kdc_fetch(context,
  99                               kdc_db_ctx,
 100                               principal,
 101                               flags,
 102                               kvno,
 103                               &sdb_entry_ex);
 104         switch (ret) {
 105         case 0:
 106                 code = 0;
 107                 break;
 108         case SDB_ERR_WRONG_REALM:
 109                 /*
 110                  * If SDB_ERR_WRONG_REALM is returned we need to process the
 111                  * sdb_entry to fill the principal in the HDB entry.
 112                  */
 113                 code = HDB_ERR_WRONG_REALM;
 114                 break;
 115         case SDB_ERR_NOENTRY:
 116                 return HDB_ERR_NOENTRY;
 117         default:
 118                 return HDB_ERR_NOT_FOUND_HERE;
 119         }
 120
 121         ret = sdb_entry_ex_to_hdb_entry_ex(context, &sdb_entry_ex, entry_ex);
 122         sdb_free_entry(&sdb_entry_ex);
 123
 124         if (code != 0 && ret != 0) {
 125                 code = ret;
 126         }
 127
 128         return code;
 129 }
 130
 131 static krb5_error_code hdb_samba4_firstkey(krb5_context context, HDB *db, unsigned flags,
 132                                         hdb_entry_ex *entry)
 133 {
 134         struct samba_kdc_db_context *kdc_db_ctx;
 135         struct sdb_entry_ex sdb_entry_ex = {};
 136         krb5_error_code ret;
 137
 138         kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
 139                                            struct samba_kdc_db_context);
 140
 141         ret = samba_kdc_firstkey(context, kdc_db_ctx, &sdb_entry_ex);
 142         switch (ret) {
 143         case 0:
 144                 break;
 145         case SDB_ERR_WRONG_REALM:
 146                 return HDB_ERR_WRONG_REALM;
 147         case SDB_ERR_NOENTRY:
 148                 return HDB_ERR_NOENTRY;
 149         default:
 150                 return HDB_ERR_NOT_FOUND_HERE;
 151         }
 152
 153         ret = sdb_entry_ex_to_hdb_entry_ex(context, &sdb_entry_ex, entry);
 154         sdb_free_entry(&sdb_entry_ex);
 155         return ret;
 156 }
 157
 158 static krb5_error_code hdb_samba4_nextkey(krb5_context context, HDB *db, unsigned flags,
 159                                    hdb_entry_ex *entry)
 160 {
 161         struct samba_kdc_db_context *kdc_db_ctx;
 162         struct sdb_entry_ex sdb_entry_ex = {};
 163         krb5_error_code ret;
 164
 165         kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
 166                                            struct samba_kdc_db_context);
 167
 168         ret = samba_kdc_nextkey(context, kdc_db_ctx, &sdb_entry_ex);
 169         switch (ret) {
 170         case 0:
 171                 break;
 172         case SDB_ERR_WRONG_REALM:
 173                 return HDB_ERR_WRONG_REALM;
 174         case SDB_ERR_NOENTRY:
 175                 return HDB_ERR_NOENTRY;
 176         default:
 177                 return HDB_ERR_NOT_FOUND_HERE;
 178         }
 179
 180         ret = sdb_entry_ex_to_hdb_entry_ex(context, &sdb_entry_ex, entry);
 181         sdb_free_entry(&sdb_entry_ex);
 182         return ret;
 183 }
 184
 185 static krb5_error_code hdb_samba4_destroy(krb5_context context, HDB *db)
 186 {
 187         talloc_free(db);
 188         return 0;
 189 }
 190
 191 static krb5_error_code
 192 hdb_samba4_check_constrained_delegation(krb5_context context, HDB *db,
 193                                         hdb_entry_ex *entry,
 194                                         krb5_const_principal target_principal)
 195 {
 196         struct samba_kdc_db_context *kdc_db_ctx;
 197         struct samba_kdc_entry *skdc_entry;
 198         krb5_error_code ret;
 199
 200         kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
 201                                            struct samba_kdc_db_context);
 202         skdc_entry = talloc_get_type_abort(entry->ctx,
 203                                            struct samba_kdc_entry);
 204
 205         ret = samba_kdc_check_s4u2proxy(context, kdc_db_ctx,
 206                                         skdc_entry,
 207                                         target_principal);
 208         switch (ret) {
 209         case 0:
 210                 break;
 211         case SDB_ERR_WRONG_REALM:
 212                 ret = HDB_ERR_WRONG_REALM;
 213                 break;
 214         case SDB_ERR_NOENTRY:
 215                 ret = HDB_ERR_NOENTRY;
 216                 break;
 217         default:
 218                 ret = HDB_ERR_NOT_FOUND_HERE;
 219                 break;
 220         }
 221
 222         return ret;
 223 }
 224
 225 static krb5_error_code
 226 hdb_samba4_check_pkinit_ms_upn_match(krb5_context context, HDB *db,
 227                                      hdb_entry_ex *entry,
 228                                      krb5_const_principal certificate_principal)
 229 {
 230         struct samba_kdc_db_context *kdc_db_ctx;
 231         struct samba_kdc_entry *skdc_entry;
 232         krb5_error_code ret;
 233
 234         kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
 235                                            struct samba_kdc_db_context);
 236         skdc_entry = talloc_get_type_abort(entry->ctx,
 237                                            struct samba_kdc_entry);
 238
 239         ret = samba_kdc_check_pkinit_ms_upn_match(context, kdc_db_ctx,
 240                                                   skdc_entry,
 241                                                   certificate_principal);
 242         switch (ret) {
 243         case 0:
 244                 break;
 245         case SDB_ERR_WRONG_REALM:
 246                 ret = HDB_ERR_WRONG_REALM;
 247                 break;
 248         case SDB_ERR_NOENTRY:
 249                 ret = HDB_ERR_NOENTRY;
 250                 break;
 251         default:
 252                 ret = HDB_ERR_NOT_FOUND_HERE;
 253                 break;
 254         }
 255
 256         return ret;
 257 }
 258
 259 static krb5_error_code
 260 hdb_samba4_check_s4u2self(krb5_context context, HDB *db,
 261                           hdb_entry_ex *entry,
 262                           krb5_const_principal target_principal)
 263 {
 264         struct samba_kdc_db_context *kdc_db_ctx;
 265         struct samba_kdc_entry *skdc_entry;
 266         krb5_error_code ret;
 267
 268         kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
 269                                            struct samba_kdc_db_context);
 270         skdc_entry = talloc_get_type_abort(entry->ctx,
 271                                            struct samba_kdc_entry);
 272
 273         ret = samba_kdc_check_s4u2self(context, kdc_db_ctx,
 274                                        skdc_entry,
 275                                        target_principal);
 276         switch (ret) {
 277         case 0:
 278                 break;
 279         case SDB_ERR_WRONG_REALM:
 280                 ret = HDB_ERR_WRONG_REALM;
 281                 break;
 282         case SDB_ERR_NOENTRY:
 283                 ret = HDB_ERR_NOENTRY;
 284                 break;
 285         default:
 286                 ret = HDB_ERR_NOT_FOUND_HERE;
 287                 break;
 288         }
 289
 290         return ret;
 291 }
 292
 293 static krb5_error_code hdb_samba4_auth_status(krb5_context context, HDB *db,
 294                                               hdb_entry_ex *entry,
 295                                               int hdb_auth_status)
 296 {
 297         struct samba_kdc_db_context *kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
 298                                                                         struct samba_kdc_db_context);
 299         struct samba_kdc_entry *p = talloc_get_type(entry->ctx, struct samba_kdc_entry);
 300
 301         if (hdb_auth_status == HDB_AUTH_WRONG_PASSWORD) {
 302                 authsam_update_bad_pwd_count(kdc_db_ctx->samdb, p->msg, ldb_get_default_basedn(kdc_db_ctx->samdb));
 303         } else if (hdb_auth_status == HDB_AUTH_SUCCESS) {
 304                 authsam_zero_bad_pwd_count(kdc_db_ctx->samdb, p->msg);
 305         }
 306         return 0;
 307 }
 308
 309 /* This interface is to be called by the KDC and libnet_keytab_dump,
 310  * which is expecting Samba calling conventions.
 311  * It is also called by a wrapper (hdb_samba4_create) from the
 312  * kpasswdd -> krb5 -> keytab_hdb -> hdb code */
 313
 314 NTSTATUS hdb_samba4_create_kdc(struct samba_kdc_base_context *base_ctx,
 315                                krb5_context context, struct HDB **db)
 316 {
 317         struct samba_kdc_db_context *kdc_db_ctx;
 318         NTSTATUS nt_status;
 319
 320         if (hdb_interface_version != HDB_INTERFACE_VERSION) {
 321                 krb5_set_error_message(context, EINVAL, "Heimdal HDB interface version mismatch between build-time and run-time libraries!");
 322                 return NT_STATUS_ERROR_DS_INCOMPATIBLE_VERSION;
 323         }
 324
 325         *db = talloc(base_ctx, HDB);
 326         if (!*db) {
 327                 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 328                 return NT_STATUS_NO_MEMORY;
 329         }
 330
 331         (*db)->hdb_master_key_set = 0;
 332         (*db)->hdb_db = NULL;
 333         (*db)->hdb_capability_flags = HDB_CAP_F_HANDLE_ENTERPRISE_PRINCIPAL;
 334
 335         nt_status = samba_kdc_setup_db_ctx(*db, base_ctx, &kdc_db_ctx);
 336         if (!NT_STATUS_IS_OK(nt_status)) {
 337                 talloc_free(*db);
 338                 return nt_status;
 339         }
 340         (*db)->hdb_db = kdc_db_ctx;
 341
 342         (*db)->hdb_dbc = NULL;
 343         (*db)->hdb_open = hdb_samba4_open;
 344         (*db)->hdb_close = hdb_samba4_close;
 345         (*db)->hdb_fetch_kvno = hdb_samba4_fetch_kvno;
 346         (*db)->hdb_store = hdb_samba4_store;
 347         (*db)->hdb_remove = hdb_samba4_remove;
 348         (*db)->hdb_firstkey = hdb_samba4_firstkey;
 349         (*db)->hdb_nextkey = hdb_samba4_nextkey;
 350         (*db)->hdb_lock = hdb_samba4_lock;
 351         (*db)->hdb_unlock = hdb_samba4_unlock;
 352         (*db)->hdb_rename = hdb_samba4_rename;
 353         /* we don't implement these, as we are not a lockable database */
 354         (*db)->hdb__get = NULL;
 355         (*db)->hdb__put = NULL;
 356         /* kadmin should not be used for deletes - use other tools instead */
 357         (*db)->hdb__del = NULL;
 358         (*db)->hdb_destroy = hdb_samba4_destroy;
 359
 360         (*db)->hdb_auth_status = hdb_samba4_auth_status;
 361         (*db)->hdb_check_constrained_delegation = hdb_samba4_check_constrained_delegation;
 362         (*db)->hdb_check_pkinit_ms_upn_match = hdb_samba4_check_pkinit_ms_upn_match;
 363         (*db)->hdb_check_s4u2self = hdb_samba4_check_s4u2self;
 364
 365         return NT_STATUS_OK;
 366 }