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/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 "../lib/util/util_ldb.h"
  38 #include "dsdb/samdb/samdb.h"
  39 #include "../libds/common/flags.h"
  40 #include "param/param.h"
  41 #include "lib/events/events.h"
  42 #include "auth/credentials/credentials.h"
  43 #include "param/secrets.h"
  44 #include "auth/auth.h"
  45
  46 /*
  47   make sure the static credentials are not freed
  48  */
  49 static int samdb_credentials_destructor(struct cli_credentials *creds)
  50 {
  51         return -1;
  52 }
  53
  54 /*
  55   this returns a static set of system credentials. It is static so
  56   that we always get the same pointer in ldb_wrap_connect()
  57  */
  58 struct cli_credentials *samdb_credentials(struct loadparm_context *lp_ctx)
  59 {
  60         static struct cli_credentials *static_credentials;
  61         struct cli_credentials *cred;
  62         char *error_string;
  63
  64         if (static_credentials) {
  65                 return static_credentials;
  66         }
  67
  68         cred = cli_credentials_init(talloc_autofree_context());
  69         if (!cred) {
  70                 return NULL;
  71         }
  72         cli_credentials_set_conf(cred, lp_ctx);
  73
  74         /* We don't want to use krb5 to talk to our samdb - recursion
  75          * here would be bad, and this account isn't in the KDC
  76          * anyway */
  77         cli_credentials_set_kerberos_state(cred, CRED_DONT_USE_KERBEROS);
  78
  79         if (!NT_STATUS_IS_OK(cli_credentials_set_secrets(cred, lp_ctx, NULL, NULL,
  80                                                          SECRETS_LDAP_FILTER, &error_string))) {
  81                 DEBUG(5, ("(normal if no LDAP backend) %s", error_string));
  82                 /* Perfectly OK - if not against an LDAP backend */
  83                 talloc_free(cred);
  84                 return NULL;
  85         }
  86         static_credentials = cred;
  87         talloc_set_destructor(cred, samdb_credentials_destructor);
  88         return cred;
  89 }
  90
  91 /*
  92   connect to the SAM database
  93   return an opaque context pointer on success, or NULL on failure
  94  */
  95 struct ldb_context *samdb_connect(TALLOC_CTX *mem_ctx,
  96                                   struct tevent_context *ev_ctx,
  97                                   struct loadparm_context *lp_ctx,
  98                                   struct auth_session_info *session_info,
  99                                   int flags)
 100 {
 101         struct ldb_context *ldb;
 102         struct dsdb_schema *schema;
 103         const char *url;
 104         struct cli_credentials *credentials;
 105         int ret;
 106
 107         url  = lpcfg_sam_url(lp_ctx);
 108         credentials = samdb_credentials(lp_ctx);
 109
 110         ldb = ldb_wrap_find(url, ev_ctx, lp_ctx, session_info, credentials, flags);
 111         if (ldb != NULL)
 112                 return talloc_reference(mem_ctx, ldb);
 113
 114         ldb = samba_ldb_init(mem_ctx, ev_ctx, lp_ctx, session_info, credentials);
 115
 116         if (ldb == NULL)
 117                 return NULL;
 118
 119         dsdb_set_global_schema(ldb);
 120
 121         ret = samba_ldb_connect(ldb, lp_ctx, url, flags);
 122         if (ret != LDB_SUCCESS) {
 123                 talloc_free(ldb);
 124                 return NULL;
 125         }
 126
 127         schema = dsdb_get_schema(ldb, NULL);
 128         /* make the resulting schema global */
 129         if (schema) {
 130                 dsdb_make_schema_global(ldb, schema);
 131         }
 132
 133         if (!ldb_wrap_add(url, ev_ctx, lp_ctx, session_info, credentials, flags, ldb)) {
 134                 talloc_free(ldb);
 135                 return NULL;
 136         }
 137
 138         return ldb;
 139 }
 140
 141
 142 /****************************************************************************
 143  Create the SID list for this user.
 144 ****************************************************************************/
 145 NTSTATUS security_token_create(TALLOC_CTX *mem_ctx,
 146                                struct loadparm_context *lp_ctx,
 147                                unsigned int num_sids,
 148                                struct dom_sid *sids,
 149                                uint32_t session_info_flags,
 150                                struct security_token **token)
 151 {
 152         struct security_token *ptoken;
 153         unsigned int i;
 154         NTSTATUS status;
 155
 156         ptoken = security_token_initialise(mem_ctx);
 157         NT_STATUS_HAVE_NO_MEMORY(ptoken);
 158
 159         ptoken->sids = talloc_array(ptoken, struct dom_sid, num_sids + 6 /* over-allocate */);
 160         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 161
 162         ptoken->num_sids = 0;
 163
 164         for (i = 0; i < num_sids; i++) {
 165                 size_t check_sid_idx;
 166                 for (check_sid_idx = 0;
 167                      check_sid_idx < ptoken->num_sids;
 168                      check_sid_idx++) {
 169                         if (dom_sid_equal(&ptoken->sids[check_sid_idx], &sids[i])) {
 170                                 break;
 171                         }
 172                 }
 173
 174                 if (check_sid_idx == ptoken->num_sids) {
 175                         ptoken->sids = talloc_realloc(ptoken, ptoken->sids, struct dom_sid, ptoken->num_sids + 1);
 176                         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 177
 178                         ptoken->sids[ptoken->num_sids] = sids[i];
 179                         ptoken->num_sids++;
 180                 }
 181         }
 182
 183         /*
 184          * Finally add the "standard" sids.
 185          * The only difference between guest and "anonymous"
 186          * is the addition of Authenticated_Users.
 187          */
 188
 189         if (session_info_flags & AUTH_SESSION_INFO_DEFAULT_GROUPS) {
 190                 ptoken->sids = talloc_realloc(ptoken, ptoken->sids, struct dom_sid, ptoken->num_sids + 2);
 191                 NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 192
 193                 if (!dom_sid_parse(SID_WORLD, &ptoken->sids[ptoken->num_sids])) {
 194                         return NT_STATUS_INTERNAL_ERROR;
 195                 }
 196                 ptoken->num_sids++;
 197
 198                 if (!dom_sid_parse(SID_NT_NETWORK, &ptoken->sids[ptoken->num_sids])) {
 199                         return NT_STATUS_INTERNAL_ERROR;
 200                 }
 201                 ptoken->num_sids++;
 202         }
 203
 204         if (session_info_flags & AUTH_SESSION_INFO_AUTHENTICATED) {
 205                 ptoken->sids = talloc_realloc(ptoken, ptoken->sids, struct dom_sid, ptoken->num_sids + 1);
 206                 NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 207
 208                 if (!dom_sid_parse(SID_NT_AUTHENTICATED_USERS, &ptoken->sids[ptoken->num_sids])) {
 209                         return NT_STATUS_INTERNAL_ERROR;
 210                 }
 211                 ptoken->num_sids++;
 212         }
 213
 214         /* The caller may have requested simple privilages, for example if there isn't a local DB */
 215         if (session_info_flags & AUTH_SESSION_INFO_SIMPLE_PRIVILEGES) {
 216                 /* Shortcuts to prevent recursion and avoid lookups */
 217                 if (ptoken->sids == NULL) {
 218                         ptoken->privilege_mask = 0;
 219                 } else if (security_token_is_system(ptoken)) {
 220                         ptoken->privilege_mask = ~0;
 221                 } else if (security_token_is_anonymous(ptoken)) {
 222                         ptoken->privilege_mask = 0;
 223                 } else if (security_token_has_builtin_administrators(ptoken)) {
 224                         ptoken->privilege_mask = ~0;
 225                 } else {
 226                         /* All other 'users' get a empty priv set so far */
 227                         ptoken->privilege_mask = 0;
 228                 }
 229         } else {
 230                 /* setup the privilege mask for this token */
 231                 status = samdb_privilege_setup(lp_ctx, ptoken);
 232                 if (!NT_STATUS_IS_OK(status)) {
 233                         talloc_free(ptoken);
 234                         DEBUG(1,("Unable to access privileges database\n"));
 235                         return status;
 236                 }
 237         }
 238
 239         security_token_debug(0, 10, ptoken);
 240
 241         *token = ptoken;
 242
 243         return NT_STATUS_OK;
 244 }