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