source4/dsdb/samdb/samdb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    interface functions for the sam database
   5
   6    Copyright (C) Andrew Tridgell 2004
   7    Copyright (C) Volker Lendecke 2004
   8    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2006
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "librpc/gen_ndr/ndr_netlogon.h"
  26 #include "librpc/gen_ndr/ndr_misc.h"
  27 #include "librpc/gen_ndr/ndr_security.h"
  28 #include "lib/events/events.h"
  29 #include "lib/ldb/include/ldb.h"
  30 #include "lib/ldb/include/ldb_errors.h"
  31 #include "libcli/security/security.h"
  32 #include "libcli/auth/libcli_auth.h"
  33 #include "libcli/ldap/ldap_ndr.h"
  34 #include "system/time.h"
  35 #include "system/filesys.h"
  36 #include "ldb_wrap.h"
  37 #include "dsdb/samdb/samdb.h"
  38 #include "../libds/common/flags.h"
  39 #include "param/param.h"
  40 #include "lib/events/events.h"
  41 #include "auth/credentials/credentials.h"
  42 #include "param/secrets.h"
  43 #include "auth/auth.h"
  44
  45 /*
  46   make sure the static credentials are not freed
  47  */
  48 static int samdb_credentials_destructor(struct cli_credentials *creds)
  49 {
  50         return -1;
  51 }
  52
  53 /*
  54   this returns a static set of system credentials. It is static so
  55   that we always get the same pointer in ldb_wrap_connect()
  56  */
  57 struct cli_credentials *samdb_credentials(struct loadparm_context *lp_ctx)
  58 {
  59         static struct cli_credentials *static_credentials;
  60         struct cli_credentials *cred;
  61         char *error_string;
  62
  63         if (static_credentials) {
  64                 return static_credentials;
  65         }
  66
  67         cred = cli_credentials_init(talloc_autofree_context());
  68         if (!cred) {
  69                 return NULL;
  70         }
  71         cli_credentials_set_conf(cred, lp_ctx);
  72
  73         /* We don't want to use krb5 to talk to our samdb - recursion
  74          * here would be bad, and this account isn't in the KDC
  75          * anyway */
  76         cli_credentials_set_kerberos_state(cred, CRED_DONT_USE_KERBEROS);
  77
  78         if (!NT_STATUS_IS_OK(cli_credentials_set_secrets(cred, lp_ctx, NULL, NULL,
  79                                                          SECRETS_LDAP_FILTER, &error_string))) {
  80                 DEBUG(5, ("(normal if no LDAP backend) %s", error_string));
  81                 /* Perfectly OK - if not against an LDAP backend */
  82                 talloc_free(cred);
  83                 return NULL;
  84         }
  85         static_credentials = cred;
  86         talloc_set_destructor(cred, samdb_credentials_destructor);
  87         return cred;
  88 }
  89
  90 /*
  91   connect to the SAM database
  92   return an opaque context pointer on success, or NULL on failure
  93  */
  94 struct ldb_context *samdb_connect(TALLOC_CTX *mem_ctx,
  95                                   struct tevent_context *ev_ctx,
  96                                   struct loadparm_context *lp_ctx,
  97                                   struct auth_session_info *session_info,
  98                                   int flags)
  99 {
 100         struct ldb_context *ldb;
 101         struct dsdb_schema *schema;
 102         const char *url;
 103         struct cli_credentials *credentials;
 104         int ret;
 105
 106         url  = lpcfg_sam_url(lp_ctx);
 107         credentials = samdb_credentials(lp_ctx);
 108
 109         ldb = ldb_wrap_find(url, ev_ctx, lp_ctx, session_info, credentials, flags);
 110         if (ldb != NULL)
 111                 return talloc_reference(mem_ctx, ldb);
 112
 113         ldb = samba_ldb_init(mem_ctx, ev_ctx, lp_ctx, session_info, credentials);
 114
 115         if (ldb == NULL)
 116                 return NULL;
 117
 118         dsdb_set_global_schema(ldb);
 119
 120         ret = samba_ldb_connect(ldb, lp_ctx, url, flags);
 121         if (ret != LDB_SUCCESS) {
 122                 talloc_free(ldb);
 123                 return NULL;
 124         }
 125
 126         schema = dsdb_get_schema(ldb, NULL);
 127         /* make the resulting schema global */
 128         if (schema) {
 129                 dsdb_make_schema_global(ldb, schema);
 130         }
 131
 132         if (!ldb_wrap_add(url, ev_ctx, lp_ctx, session_info, credentials, flags, ldb)) {
 133                 talloc_free(ldb);
 134                 return NULL;
 135         }
 136
 137         return ldb;
 138 }
 139
 140
 141 /****************************************************************************
 142  Create the SID list for this user.
 143 ****************************************************************************/
 144 NTSTATUS security_token_create(TALLOC_CTX *mem_ctx,
 145                                struct tevent_context *ev_ctx,
 146                                struct loadparm_context *lp_ctx,
 147                                struct dom_sid *user_sid,
 148                                struct dom_sid *group_sid,
 149                                unsigned int n_groupSIDs,
 150                                struct dom_sid **groupSIDs,
 151                                uint32_t session_info_flags,
 152                                struct security_token **token)
 153 {
 154         struct security_token *ptoken;
 155         unsigned int i;
 156         NTSTATUS status;
 157
 158         ptoken = security_token_initialise(mem_ctx);
 159         NT_STATUS_HAVE_NO_MEMORY(ptoken);
 160
 161         ptoken->sids = talloc_array(ptoken, struct dom_sid, n_groupSIDs + 6 /* over-allocate */);
 162         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 163
 164         ptoken->num_sids = 1;
 165
 166         ptoken->sids = talloc_realloc(ptoken, ptoken->sids, struct dom_sid, ptoken->num_sids + 1);
 167         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 168
 169         ptoken->sids[PRIMARY_USER_SID_INDEX] = *user_sid;
 170         if (!dom_sid_equal(user_sid, group_sid)) {
 171                 ptoken->sids[PRIMARY_GROUP_SID_INDEX] = *group_sid;
 172                 ptoken->num_sids++;
 173         }
 174
 175         /*
 176          * Finally add the "standard" SIDs.
 177          * The only difference between guest and "anonymous"
 178          * is the addition of Authenticated_Users.
 179          */
 180
 181         if (session_info_flags & AUTH_SESSION_INFO_DEFAULT_GROUPS) {
 182                 ptoken->sids = talloc_realloc(ptoken, ptoken->sids, struct dom_sid, ptoken->num_sids + 2);
 183                 NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 184
 185                 if (!dom_sid_parse(SID_WORLD, &ptoken->sids[ptoken->num_sids])) {
 186                         return NT_STATUS_INTERNAL_ERROR;
 187                 }
 188                 ptoken->num_sids++;
 189
 190                 if (!dom_sid_parse(SID_NT_NETWORK, &ptoken->sids[ptoken->num_sids])) {
 191                         return NT_STATUS_INTERNAL_ERROR;
 192                 }
 193                 ptoken->num_sids++;
 194         }
 195
 196         if (session_info_flags & AUTH_SESSION_INFO_AUTHENTICATED) {
 197                 ptoken->sids = talloc_realloc(ptoken, ptoken->sids, struct dom_sid, ptoken->num_sids + 1);
 198                 NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 199
 200                 if (!dom_sid_parse(SID_NT_AUTHENTICATED_USERS, &ptoken->sids[ptoken->num_sids])) {
 201                         return NT_STATUS_INTERNAL_ERROR;
 202                 }
 203                 ptoken->num_sids++;
 204         }
 205
 206         for (i = 0; i < n_groupSIDs; i++) {
 207                 size_t check_sid_idx;
 208                 for (check_sid_idx = 1;
 209                      check_sid_idx < ptoken->num_sids;
 210                      check_sid_idx++) {
 211                         if (dom_sid_equal(&ptoken->sids[check_sid_idx], groupSIDs[i])) {
 212                                 break;
 213                         }
 214                 }
 215
 216                 if (check_sid_idx == ptoken->num_sids) {
 217                         ptoken->sids = talloc_realloc(ptoken, ptoken->sids, struct dom_sid, ptoken->num_sids + 1);
 218                         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 219
 220                         ptoken->sids[ptoken->num_sids] = *groupSIDs[i];
 221                         ptoken->num_sids++;
 222                 }
 223         }
 224
 225         /* setup the privilege mask for this token */
 226         status = samdb_privilege_setup(ev_ctx, lp_ctx, ptoken);
 227         if (!NT_STATUS_IS_OK(status)) {
 228                 talloc_free(ptoken);
 229                 return status;
 230         }
 231
 232         security_token_debug(0, 10, ptoken);
 233
 234         *token = ptoken;
 235
 236         return NT_STATUS_OK;
 237 }