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 "auth/auth.h"
  37 #include "auth/credentials/credentials.h"
  38 #include "dsdb/samdb/samdb.h"
  39 #include "param/param.h"
  40 #include "kdc/kdc.h"
  41 #include "kdc/db-glue.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(krb5_context context, HDB *db,
  86                                  krb5_const_principal principal,
  87                                  unsigned flags,
  88                                  hdb_entry_ex *entry_ex)
  89 {
  90         struct samba_kdc_db_context *kdc_db_ctx;
  91
  92         kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
  93                                            struct samba_kdc_db_context);
  94
  95         return samba_kdc_fetch(context, kdc_db_ctx, principal, flags, entry_ex);
  96 }
  97
  98 static krb5_error_code hdb_samba4_firstkey(krb5_context context, HDB *db, unsigned flags,
  99                                         hdb_entry_ex *entry)
 100 {
 101         struct samba_kdc_db_context *kdc_db_ctx;
 102
 103         kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
 104                                            struct samba_kdc_db_context);
 105
 106         return samba_kdc_firstkey(context, kdc_db_ctx, entry);
 107 }
 108
 109 static krb5_error_code hdb_samba4_nextkey(krb5_context context, HDB *db, unsigned flags,
 110                                    hdb_entry_ex *entry)
 111 {
 112         struct samba_kdc_db_context *kdc_db_ctx;
 113
 114         kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
 115                                            struct samba_kdc_db_context);
 116
 117         return samba_kdc_nextkey(context, kdc_db_ctx, entry);
 118 }
 119
 120 static krb5_error_code hdb_samba4_destroy(krb5_context context, HDB *db)
 121 {
 122         struct samba_kdc_db_context *kdc_db_ctx;
 123
 124         kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
 125                                            struct samba_kdc_db_context);
 126
 127         if (kdc_db_ctx) {
 128                 talloc_free(kdc_db_ctx->samdb);
 129                 kdc_db_ctx->samdb = NULL;
 130         }
 131
 132         talloc_free(db);
 133         return 0;
 134 }
 135
 136 static krb5_error_code
 137 hdb_samba4_check_identical_client_and_server(krb5_context context, HDB *db,
 138                                         hdb_entry_ex *entry,
 139                                         krb5_const_principal target_principal)
 140 {
 141         struct samba_kdc_db_context *kdc_db_ctx;
 142
 143         kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
 144                                            struct samba_kdc_db_context);
 145
 146         return samba_kdc_check_identical_client_and_server(context, kdc_db_ctx,
 147                                                            entry,
 148                                                            target_principal);
 149 }
 150
 151 static krb5_error_code
 152 hdb_samba4_check_pkinit_ms_upn_match(krb5_context context, HDB *db,
 153                                      hdb_entry_ex *entry,
 154                                      krb5_const_principal certificate_principal)
 155 {
 156         struct samba_kdc_db_context *kdc_db_ctx;
 157
 158         kdc_db_ctx = talloc_get_type_abort(db->hdb_db,
 159                                            struct samba_kdc_db_context);
 160
 161         return samba_kdc_check_pkinit_ms_upn_match(context, kdc_db_ctx,
 162                                                    entry,
 163                                                    certificate_principal);
 164 }
 165
 166 /* This interface is to be called by the KDC and libnet_keytab_dump,
 167  * which is expecting Samba calling conventions.
 168  * It is also called by a wrapper (hdb_samba4_create) from the
 169  * kpasswdd -> krb5 -> keytab_hdb -> hdb code */
 170
 171 NTSTATUS hdb_samba4_create_kdc(struct samba_kdc_base_context *base_ctx,
 172                                krb5_context context, struct HDB **db)
 173 {
 174         struct samba_kdc_db_context *kdc_db_ctx;
 175         struct auth_session_info *session_info;
 176         NTSTATUS nt_status;
 177
 178         *db = talloc(base_ctx, HDB);
 179         if (!*db) {
 180                 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
 181                 return NT_STATUS_NO_MEMORY;
 182         }
 183
 184         (*db)->hdb_master_key_set = 0;
 185         (*db)->hdb_db = NULL;
 186         (*db)->hdb_capability_flags = 0;
 187
 188 #if 1
 189         /* we would prefer to use system_session(), as that would
 190          * allow us to share the samdb backend context with other parts of the
 191          * system. For now we can't as we need to override the
 192          * credentials to set CRED_DONT_USE_KERBEROS, which would
 193          * break other users of the system_session */
 194         DEBUG(0,("FIXME: Using new system session for hdb\n"));
 195         nt_status = auth_system_session_info(*db, base_ctx->lp_ctx, &session_info);
 196         if (!NT_STATUS_IS_OK(nt_status)) {
 197                return nt_status;
 198         }
 199 #else
 200         session_info = system_session(kdc_db_ctx->lp_ctx);
 201         if (session_info == NULL) {
 202                 return NT_STATUS_INTERNAL_ERROR;
 203         }
 204 #endif
 205
 206         /* The idea here is very simple.  Using Kerberos to
 207          * authenticate the KDC to the LDAP server is higly likely to
 208          * be circular.
 209          *
 210          * In future we may set this up to use EXERNAL and SSL
 211          * certificates, for now it will almost certainly be NTLMSSP_SET_USERNAME
 212         */
 213
 214         cli_credentials_set_kerberos_state(session_info->credentials,
 215                                            CRED_DONT_USE_KERBEROS);
 216
 217         kdc_db_ctx = talloc_zero(*db, struct samba_kdc_db_context);
 218         if (kdc_db_ctx == NULL) {
 219                 return NT_STATUS_NO_MEMORY;
 220         }
 221         kdc_db_ctx->ev_ctx = base_ctx->ev_ctx;
 222         kdc_db_ctx->lp_ctx = base_ctx->lp_ctx;
 223         kdc_db_ctx->ic_ctx = lp_iconv_convenience(base_ctx->lp_ctx);
 224
 225         /* Setup the link to LDB */
 226         kdc_db_ctx->samdb = samdb_connect(kdc_db_ctx, base_ctx->ev_ctx,
 227                                           base_ctx->lp_ctx, session_info);
 228         if (kdc_db_ctx->samdb == NULL) {
 229                 DEBUG(1, ("hdb_samba4_create: Cannot open samdb for KDC backend!"));
 230                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 231         }
 232
 233         (*db)->hdb_db = kdc_db_ctx;
 234
 235         (*db)->hdb_dbc = NULL;
 236         (*db)->hdb_open = hdb_samba4_open;
 237         (*db)->hdb_close = hdb_samba4_close;
 238         (*db)->hdb_fetch = hdb_samba4_fetch;
 239         (*db)->hdb_store = hdb_samba4_store;
 240         (*db)->hdb_remove = hdb_samba4_remove;
 241         (*db)->hdb_firstkey = hdb_samba4_firstkey;
 242         (*db)->hdb_nextkey = hdb_samba4_nextkey;
 243         (*db)->hdb_lock = hdb_samba4_lock;
 244         (*db)->hdb_unlock = hdb_samba4_unlock;
 245         (*db)->hdb_rename = hdb_samba4_rename;
 246         /* we don't implement these, as we are not a lockable database */
 247         (*db)->hdb__get = NULL;
 248         (*db)->hdb__put = NULL;
 249         /* kadmin should not be used for deletes - use other tools instead */
 250         (*db)->hdb__del = NULL;
 251         (*db)->hdb_destroy = hdb_samba4_destroy;
 252
 253         (*db)->hdb_auth_status = NULL;
 254         (*db)->hdb_check_constrained_delegation = hdb_samba4_check_identical_client_and_server;
 255         (*db)->hdb_check_pkinit_ms_upn_match = hdb_samba4_check_pkinit_ms_upn_match;
 256         (*db)->hdb_check_s4u2self = hdb_samba4_check_identical_client_and_server;
 257
 258         return NT_STATUS_OK;
 259 }
 260
 261 static krb5_error_code hdb_samba4_create(krb5_context context, struct HDB **db, const char *arg)
 262 {
 263         NTSTATUS nt_status;
 264         void *ptr;
 265         struct samba_kdc_base_context *base_ctx;
 266
 267         if (sscanf(arg, "&%p", &ptr) != 1) {
 268                 return EINVAL;
 269         }
 270         base_ctx = talloc_get_type_abort(ptr, struct samba_kdc_base_context);
 271         /* The global kdc_mem_ctx and kdc_lp_ctx, Disgusting, ugly hack, but it means one less private hook */
 272         nt_status = hdb_samba4_create_kdc(base_ctx, context, db);
 273
 274         if (NT_STATUS_IS_OK(nt_status)) {
 275                 return 0;
 276         }
 277         return EINVAL;
 278 }
 279
 280 /* Only used in the hdb-backed keytab code
 281  * for a keytab of 'samba4&<address>', to find
 282  * kpasswd's key in the main DB, and to
 283  * copy all the keys into a file (libnet_keytab_export)
 284  *
 285  * The <address> is the string form of a pointer to a talloced struct hdb_samba_context
 286  */
 287 struct hdb_method hdb_samba4 = {
 288         .interface_version = HDB_INTERFACE_VERSION,
 289         .prefix = "samba4",
 290         .create = hdb_samba4_create
 291 };