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_security.h"
  27 #include "lib/events/events.h"
  28 #include "lib/ldb-samba/ldb_wrap.h"
  29 #include <ldb.h>
  30 #include <ldb_errors.h>
  31 #include "libcli/security/security.h"
  32 #include "libcli/security/claims-conversions.h"
  33 #include "libcli/auth/libcli_auth.h"
  34 #include "libcli/ldap/ldap_ndr.h"
  35 #include "system/time.h"
  36 #include "system/filesys.h"
  37 #include "ldb_wrap.h"
  38 #include "../lib/util/util_ldb.h"
  39 #include "dsdb/samdb/samdb.h"
  40 #include "../libds/common/flags.h"
  41 #include "param/param.h"
  42 #include "lib/events/events.h"
  43 #include "auth/credentials/credentials.h"
  44 #include "param/secrets.h"
  45 #include "auth/auth.h"
  46 #include "lib/tsocket/tsocket.h"
  47 #include "lib/param/loadparm.h"
  48
  49 /*
  50   connect to the SAM database specified by URL
  51   return an opaque context pointer on success, or NULL on failure
  52  */
  53 int samdb_connect_url(TALLOC_CTX *mem_ctx,
  54                       struct tevent_context *ev_ctx,
  55                       struct loadparm_context *lp_ctx,
  56                       struct auth_session_info *session_info,
  57                       unsigned int flags,
  58                       const char *url,
  59                       const struct tsocket_address *remote_address,
  60                       struct ldb_context **ldb_ret,
  61                       char **errstring)
  62 {
  63         struct ldb_context *ldb = NULL;
  64         int ret;
  65         *ldb_ret = NULL;
  66         *errstring = NULL;
  67
  68         /* We create sam.ldb in provision, and never anywhere else */
  69         flags |= LDB_FLG_DONT_CREATE_DB;
  70
  71         if (remote_address == NULL) {
  72                 ldb = ldb_wrap_find(url, ev_ctx, lp_ctx,
  73                                     session_info, NULL, flags);
  74                 if (ldb != NULL) {
  75                         *ldb_ret = talloc_reference(mem_ctx, ldb);
  76                         if (*ldb_ret == NULL) {
  77                                 return LDB_ERR_OPERATIONS_ERROR;
  78                         }
  79                         return LDB_SUCCESS;
  80                 }
  81         }
  82
  83         ldb = samba_ldb_init(mem_ctx, ev_ctx, lp_ctx, session_info, NULL);
  84
  85         if (ldb == NULL) {
  86                 *errstring = talloc_asprintf(mem_ctx,
  87                                              "Failed to set up Samba ldb "
  88                                              "wrappers with samba_ldb_init() "
  89                                              "to connect to %s",
  90                                              url);
  91                 return LDB_ERR_OPERATIONS_ERROR;
  92         }
  93
  94         dsdb_set_global_schema(ldb);
  95
  96         ret = samba_ldb_connect(ldb, lp_ctx, url, flags);
  97         if (ret != LDB_SUCCESS) {
  98                 *errstring = talloc_asprintf(mem_ctx,
  99                                              "Failed to connect to %s: %s",
 100                                              url,
 101                                              ldb_errstring(ldb));
 102                 talloc_free(ldb);
 103                 return LDB_ERR_OPERATIONS_ERROR;
 104         }
 105
 106         /*
 107          * If a remote_address was specified, then set it on the DB
 108          * and do not add to the wrap list (as we need to keep the LDB
 109          * pointer unique for the address).
 110          *
 111          * We use this for audit logging and for the "netlogon" attribute
 112          */
 113         if (remote_address != NULL) {
 114                 ldb_set_opaque(ldb, "remoteAddress",
 115                                discard_const(remote_address));
 116                 *ldb_ret = ldb;
 117                 return LDB_SUCCESS;
 118         }
 119
 120         if (!ldb_wrap_add(url, ev_ctx, lp_ctx, session_info, NULL, flags, ldb)) {
 121                 *errstring = talloc_asprintf(mem_ctx,
 122                                              "Failed to add cached DB reference"
 123                                              " to %s",
 124                                              url);
 125                 talloc_free(ldb);
 126                 return LDB_ERR_OPERATIONS_ERROR;
 127         }
 128
 129         *ldb_ret = ldb;
 130         return LDB_SUCCESS;
 131 }
 132
 133
 134 /*
 135   connect to the SAM database
 136   return an opaque context pointer on success, or NULL on failure
 137  */
 138 struct ldb_context *samdb_connect(TALLOC_CTX *mem_ctx,
 139                                   struct tevent_context *ev_ctx,
 140                                   struct loadparm_context *lp_ctx,
 141                                   struct auth_session_info *session_info,
 142                                   const struct tsocket_address *remote_address,
 143                                   unsigned int flags)
 144 {
 145         char *errstring;
 146         struct ldb_context *ldb;
 147         int ret = samdb_connect_url(mem_ctx,
 148                                     ev_ctx,
 149                                     lp_ctx,
 150                                     session_info,
 151                                     flags,
 152                                     "sam.ldb",
 153                                     remote_address,
 154                                     &ldb,
 155                                     &errstring);
 156         if (ret == LDB_SUCCESS) {
 157                 return ldb;
 158         }
 159         return NULL;
 160 }
 161
 162 /****************************************************************************
 163  Create the SID list for this user.
 164 ****************************************************************************/
 165 NTSTATUS security_token_create(TALLOC_CTX *mem_ctx,
 166                                struct loadparm_context *lp_ctx,
 167                                uint32_t num_sids,
 168                                const struct auth_SidAttr *sids,
 169                                uint32_t num_device_sids,
 170                                const struct auth_SidAttr *device_sids,
 171                                struct auth_claims auth_claims,
 172                                uint32_t session_info_flags,
 173                                struct security_token **token)
 174 {
 175         struct security_token *ptoken;
 176         uint32_t i;
 177         NTSTATUS status;
 178         enum claims_evaluation_control evaluate_claims;
 179         bool sids_are_valid = false;
 180         bool device_sids_are_valid = false;
 181         bool authentication_was_compounded = session_info_flags & AUTH_SESSION_INFO_FORCE_COMPOUNDED_AUTHENTICATION;
 182
 183         /*
 184          * Some special-case callers can't supply the lp_ctx, but do
 185          * not interact with claims or conditional ACEs
 186          */
 187         if (lp_ctx == NULL) {
 188                 evaluate_claims = CLAIMS_EVALUATION_INVALID_STATE;
 189         } else {
 190                 enum acl_claims_evaluation claims_evaultion_setting
 191                         = lpcfg_acl_claims_evaluation(lp_ctx);
 192
 193                 /*
 194                  * We are well inside the AD DC, so we do not need to check
 195                  * the server role etc
 196                  */
 197                 switch (claims_evaultion_setting) {
 198                 case ACL_CLAIMS_EVALUATION_AD_DC_ONLY:
 199                         evaluate_claims = CLAIMS_EVALUATION_ALWAYS;
 200                         break;
 201                 default:
 202                         evaluate_claims = CLAIMS_EVALUATION_NEVER;
 203                 }
 204         }
 205
 206         ptoken = security_token_initialise(mem_ctx, evaluate_claims);
 207         NT_STATUS_HAVE_NO_MEMORY(ptoken);
 208
 209         if (num_sids > UINT32_MAX - 6) {
 210                 talloc_free(ptoken);
 211                 return NT_STATUS_INVALID_PARAMETER;
 212         }
 213         ptoken->sids = talloc_array(ptoken, struct dom_sid, num_sids + 6 /* over-allocate */);
 214         if (ptoken->sids == NULL) {
 215                 talloc_free(ptoken);
 216                 return NT_STATUS_NO_MEMORY;
 217         }
 218
 219         ptoken->num_sids = 0;
 220
 221         for (i = 0; i < num_sids; i++) {
 222                 uint32_t check_sid_idx;
 223                 for (check_sid_idx = 0;
 224                      check_sid_idx < ptoken->num_sids;
 225                      check_sid_idx++) {
 226                         if (dom_sid_equal(&ptoken->sids[check_sid_idx], &sids[i].sid)) {
 227                                 break;
 228                         }
 229                 }
 230
 231                 if (check_sid_idx == ptoken->num_sids) {
 232                         const struct dom_sid *sid = &sids[i].sid;
 233
 234                         sids_are_valid = sids_are_valid || dom_sid_equal(
 235                                 sid, &global_sid_Claims_Valid);
 236                         authentication_was_compounded = authentication_was_compounded || dom_sid_equal(
 237                                 sid, &global_sid_Compounded_Authentication);
 238
 239                         ptoken->sids = talloc_realloc(ptoken, ptoken->sids, struct dom_sid, ptoken->num_sids + 1);
 240                         if (ptoken->sids == NULL) {
 241                                 talloc_free(ptoken);
 242                                 return NT_STATUS_NO_MEMORY;
 243                         }
 244
 245                         ptoken->sids[ptoken->num_sids] = *sid;
 246                         ptoken->num_sids++;
 247                 }
 248         }
 249
 250         if (authentication_was_compounded && num_device_sids) {
 251                 ptoken->device_sids = talloc_array(ptoken, struct dom_sid, num_device_sids);
 252                 if (ptoken->device_sids == NULL) {
 253                         talloc_free(ptoken);
 254                         return NT_STATUS_NO_MEMORY;
 255                 }
 256                 for (i = 0; i < num_device_sids; i++) {
 257                         uint32_t check_sid_idx;
 258                         for (check_sid_idx = 0;
 259                              check_sid_idx < ptoken->num_device_sids;
 260                              check_sid_idx++) {
 261                                 if (dom_sid_equal(&ptoken->device_sids[check_sid_idx], &device_sids[i].sid)) {
 262                                         break;
 263                                 }
 264                         }
 265
 266                         if (check_sid_idx == ptoken->num_device_sids) {
 267                                 const struct dom_sid *device_sid = &device_sids[i].sid;
 268
 269                                 device_sids_are_valid = device_sids_are_valid || dom_sid_equal(
 270                                         device_sid, &global_sid_Claims_Valid);
 271
 272                                 ptoken->device_sids = talloc_realloc(ptoken,
 273                                                                      ptoken->device_sids,
 274                                                                      struct dom_sid,
 275                                                                      ptoken->num_device_sids + 1);
 276                                 if (ptoken->device_sids == NULL) {
 277                                         talloc_free(ptoken);
 278                                         return NT_STATUS_NO_MEMORY;
 279                                 }
 280
 281                                 ptoken->device_sids[ptoken->num_device_sids] = *device_sid;
 282                                 ptoken->num_device_sids++;
 283                         }
 284                 }
 285         }
 286
 287         /* The caller may have requested simple privileges, for example if there isn't a local DB */
 288         if (session_info_flags & AUTH_SESSION_INFO_SIMPLE_PRIVILEGES) {
 289                 /* Shortcuts to prevent recursion and avoid lookups */
 290                 if (ptoken->sids == NULL) {
 291                         ptoken->privilege_mask = 0;
 292                 } else if (security_token_is_system(ptoken)) {
 293                         ptoken->privilege_mask = ~0;
 294                 } else if (security_token_is_anonymous(ptoken)) {
 295                         ptoken->privilege_mask = 0;
 296                 } else if (security_token_has_builtin_administrators(ptoken)) {
 297                         ptoken->privilege_mask = ~0;
 298                 } else {
 299                         /* All other 'users' get a empty priv set so far */
 300                         ptoken->privilege_mask = 0;
 301                 }
 302         } else {
 303                 /* setup the privilege mask for this token */
 304                 status = samdb_privilege_setup(lp_ctx, ptoken);
 305                 if (!NT_STATUS_IS_OK(status)) {
 306                         talloc_free(ptoken);
 307                         DEBUG(1,("Unable to access privileges database\n"));
 308                         return status;
 309                 }
 310         }
 311
 312         /*
 313          * TODO: we might want to regard ‘session_info_flags’ for the device
 314          * SIDs as well as for the client SIDs.
 315          */
 316
 317         if (sids_are_valid) {
 318                 status = claims_data_security_claims(ptoken,
 319                                                      auth_claims.user_claims,
 320                                                      &ptoken->user_claims,
 321                                                      &ptoken->num_user_claims);
 322                 if (!NT_STATUS_IS_OK(status)) {
 323                         talloc_free(ptoken);
 324                         return status;
 325                 }
 326         }
 327
 328         if (device_sids_are_valid && authentication_was_compounded) {
 329                 status = claims_data_security_claims(ptoken,
 330                                                      auth_claims.device_claims,
 331                                                      &ptoken->device_claims,
 332                                                      &ptoken->num_device_claims);
 333                 if (!NT_STATUS_IS_OK(status)) {
 334                         talloc_free(ptoken);
 335                         return status;
 336                 }
 337         }
 338
 339         security_token_debug(0, 10, ptoken);
 340
 341         *token = ptoken;
 342
 343         return NT_STATUS_OK;
 344 }