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 "../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
  45 char *samdb_relative_path(struct ldb_context *ldb,
  46                                  TALLOC_CTX *mem_ctx,
  47                                  const char *name)
  48 {
  49         const char *base_url =
  50                 (const char *)ldb_get_opaque(ldb, "ldb_url");
  51         char *path, *p, *full_name;
  52         if (name == NULL) {
  53                 return NULL;
  54         }
  55         if (name[0] == 0 || name[0] == '/' || strstr(name, ":/")) {
  56                 return talloc_strdup(mem_ctx, name);
  57         }
  58         if (strncmp("tdb://", base_url, 6) == 0) {
  59                 base_url = base_url+6;
  60         }
  61         path = talloc_strdup(mem_ctx, base_url);
  62         if (path == NULL) {
  63                 return NULL;
  64         }
  65         if ( (p = strrchr(path, '/')) != NULL) {
  66                 p[0] = '\0';
  67                 full_name = talloc_asprintf(mem_ctx, "%s/%s", path, name);
  68         } else {
  69                 full_name = talloc_asprintf(mem_ctx, "./%s", name);
  70         }
  71         talloc_free(path);
  72         return full_name;
  73 }
  74
  75 /*
  76   make sure the static credentials are not freed
  77  */
  78 static int samdb_credentials_destructor(struct cli_credentials *creds)
  79 {
  80         return -1;
  81 }
  82
  83 /*
  84   this returns a static set of system credentials. It is static so
  85   that we always get the same pointer in ldb_wrap_connect()
  86  */
  87 struct cli_credentials *samdb_credentials(struct tevent_context *event_ctx,
  88                                           struct loadparm_context *lp_ctx)
  89 {
  90         static struct cli_credentials *static_credentials;
  91         struct cli_credentials *cred;
  92
  93         if (static_credentials) {
  94                 return static_credentials;
  95         }
  96
  97         cred = cli_credentials_init(talloc_autofree_context());
  98         if (!cred) {
  99                 return NULL;
 100         }
 101         cli_credentials_set_conf(cred, lp_ctx);
 102
 103         /* We don't want to use krb5 to talk to our samdb - recursion
 104          * here would be bad, and this account isn't in the KDC
 105          * anyway */
 106         cli_credentials_set_kerberos_state(cred, CRED_DONT_USE_KERBEROS);
 107
 108         if (!NT_STATUS_IS_OK(cli_credentials_set_secrets(cred, event_ctx, lp_ctx, NULL, NULL,
 109                                                          SECRETS_LDAP_FILTER))) {
 110                 /* Perfectly OK - if not against an LDAP backend */
 111                 talloc_free(cred);
 112                 return NULL;
 113         }
 114         static_credentials = cred;
 115         talloc_set_destructor(cred, samdb_credentials_destructor);
 116         return cred;
 117 }
 118
 119 /*
 120   connect to the SAM database
 121   return an opaque context pointer on success, or NULL on failure
 122  */
 123 struct ldb_context *samdb_connect(TALLOC_CTX *mem_ctx,
 124                                   struct tevent_context *ev_ctx,
 125                                   struct loadparm_context *lp_ctx,
 126                                   struct auth_session_info *session_info)
 127 {
 128         struct ldb_context *ldb;
 129         ldb = ldb_wrap_connect(mem_ctx, ev_ctx, lp_ctx,
 130                                lp_sam_url(lp_ctx), session_info,
 131                                samdb_credentials(ev_ctx, lp_ctx),
 132                                0);
 133         if (!ldb) {
 134                 return NULL;
 135         }
 136         return ldb;
 137 }
 138
 139
 140 /****************************************************************************
 141  Create the SID list for this user.
 142 ****************************************************************************/
 143 NTSTATUS security_token_create(TALLOC_CTX *mem_ctx,
 144                                struct tevent_context *ev_ctx,
 145                                struct loadparm_context *lp_ctx,
 146                                struct dom_sid *user_sid,
 147                                struct dom_sid *group_sid,
 148                                int n_groupSIDs,
 149                                struct dom_sid **groupSIDs,
 150                                bool is_authenticated,
 151                                struct security_token **token)
 152 {
 153         struct security_token *ptoken;
 154         int i;
 155         NTSTATUS status;
 156
 157         ptoken = security_token_initialise(mem_ctx);
 158         NT_STATUS_HAVE_NO_MEMORY(ptoken);
 159
 160         ptoken->sids = talloc_array(ptoken, struct dom_sid *, n_groupSIDs + 5);
 161         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 162
 163         ptoken->user_sid = talloc_reference(ptoken, user_sid);
 164         ptoken->group_sid = talloc_reference(ptoken, group_sid);
 165         ptoken->privilege_mask = 0;
 166
 167         ptoken->sids[0] = ptoken->user_sid;
 168         ptoken->sids[1] = ptoken->group_sid;
 169
 170         /*
 171          * Finally add the "standard" SIDs.
 172          * The only difference between guest and "anonymous"
 173          * is the addition of Authenticated_Users.
 174          */
 175         ptoken->sids[2] = dom_sid_parse_talloc(ptoken->sids, SID_WORLD);
 176         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids[2]);
 177         ptoken->sids[3] = dom_sid_parse_talloc(ptoken->sids, SID_NT_NETWORK);
 178         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids[3]);
 179         ptoken->num_sids = 4;
 180
 181         if (is_authenticated) {
 182                 ptoken->sids[4] = dom_sid_parse_talloc(ptoken->sids, SID_NT_AUTHENTICATED_USERS);
 183                 NT_STATUS_HAVE_NO_MEMORY(ptoken->sids[4]);
 184                 ptoken->num_sids++;
 185         }
 186
 187         for (i = 0; i < n_groupSIDs; i++) {
 188                 size_t check_sid_idx;
 189                 for (check_sid_idx = 1;
 190                      check_sid_idx < ptoken->num_sids;
 191                      check_sid_idx++) {
 192                         if (dom_sid_equal(ptoken->sids[check_sid_idx], groupSIDs[i])) {
 193                                 break;
 194                         }
 195                 }
 196
 197                 if (check_sid_idx == ptoken->num_sids) {
 198                         ptoken->sids[ptoken->num_sids++] = talloc_reference(ptoken->sids, groupSIDs[i]);
 199                 }
 200         }
 201
 202         /* setup the privilege mask for this token */
 203         status = samdb_privilege_setup(ev_ctx, lp_ctx, ptoken);
 204         if (!NT_STATUS_IS_OK(status)) {
 205                 talloc_free(ptoken);
 206                 return status;
 207         }
 208
 209         security_token_debug(10, ptoken);
 210
 211         *token = ptoken;
 212
 213         return NT_STATUS_OK;
 214 }