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 (strncmp("tdb://", base_url, 6) == 0) {
  56                 base_url = base_url+6;
  57         }
  58         path = talloc_strdup(mem_ctx, base_url);
  59         if (path == NULL) {
  60                 return NULL;
  61         }
  62         if ( (p = strrchr(path, '/')) != NULL) {
  63                 p[0] = '\0';
  64                 full_name = talloc_asprintf(mem_ctx, "%s/%s", path, name);
  65         } else {
  66                 full_name = talloc_asprintf(mem_ctx, "./%s", name);
  67         }
  68         talloc_free(path);
  69         return full_name;
  70 }
  71
  72 /*
  73   make sure the static credentials are not freed
  74  */
  75 static int samdb_credentials_destructor(struct cli_credentials *creds)
  76 {
  77         return -1;
  78 }
  79
  80 /*
  81   this returns a static set of system credentials. It is static so
  82   that we always get the same pointer in ldb_wrap_connect()
  83  */
  84 struct cli_credentials *samdb_credentials(struct tevent_context *event_ctx,
  85                                           struct loadparm_context *lp_ctx)
  86 {
  87         static struct cli_credentials *static_credentials;
  88         struct cli_credentials *cred;
  89         char *error_string;
  90
  91         if (static_credentials) {
  92                 return static_credentials;
  93         }
  94
  95         cred = cli_credentials_init(talloc_autofree_context());
  96         if (!cred) {
  97                 return NULL;
  98         }
  99         cli_credentials_set_conf(cred, lp_ctx);
 100
 101         /* We don't want to use krb5 to talk to our samdb - recursion
 102          * here would be bad, and this account isn't in the KDC
 103          * anyway */
 104         cli_credentials_set_kerberos_state(cred, CRED_DONT_USE_KERBEROS);
 105
 106         if (!NT_STATUS_IS_OK(cli_credentials_set_secrets(cred, event_ctx, lp_ctx, NULL, NULL,
 107                                                          SECRETS_LDAP_FILTER, &error_string))) {
 108                 DEBUG(5, ("(normal if no LDAP backend) %s", error_string));
 109                 /* Perfectly OK - if not against an LDAP backend */
 110                 talloc_free(cred);
 111                 return NULL;
 112         }
 113         static_credentials = cred;
 114         talloc_set_destructor(cred, samdb_credentials_destructor);
 115         return cred;
 116 }
 117
 118 /*
 119   connect to the SAM database
 120   return an opaque context pointer on success, or NULL on failure
 121  */
 122 struct ldb_context *samdb_connect(TALLOC_CTX *mem_ctx,
 123                                   struct tevent_context *ev_ctx,
 124                                   struct loadparm_context *lp_ctx,
 125                                   struct auth_session_info *session_info)
 126 {
 127         struct ldb_context *ldb;
 128         ldb = ldb_wrap_connect(mem_ctx, ev_ctx, lp_ctx,
 129                                lp_sam_url(lp_ctx), session_info,
 130                                samdb_credentials(ev_ctx, lp_ctx),
 131                                0);
 132         if (!ldb) {
 133                 return NULL;
 134         }
 135         return ldb;
 136 }
 137
 138
 139 /****************************************************************************
 140  Create the SID list for this user.
 141 ****************************************************************************/
 142 NTSTATUS security_token_create(TALLOC_CTX *mem_ctx,
 143                                struct tevent_context *ev_ctx,
 144                                struct loadparm_context *lp_ctx,
 145                                struct dom_sid *user_sid,
 146                                struct dom_sid *group_sid,
 147                                int n_groupSIDs,
 148                                struct dom_sid **groupSIDs,
 149                                bool is_authenticated,
 150                                struct security_token **token)
 151 {
 152         struct security_token *ptoken;
 153         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 *, n_groupSIDs + 5);
 160         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 161
 162         ptoken->user_sid = talloc_reference(ptoken, user_sid);
 163         ptoken->group_sid = talloc_reference(ptoken, group_sid);
 164         ptoken->privilege_mask = 0;
 165
 166         ptoken->sids[0] = ptoken->user_sid;
 167         ptoken->sids[1] = ptoken->group_sid;
 168
 169         /*
 170          * Finally add the "standard" SIDs.
 171          * The only difference between guest and "anonymous"
 172          * is the addition of Authenticated_Users.
 173          */
 174         ptoken->sids[2] = dom_sid_parse_talloc(ptoken->sids, SID_WORLD);
 175         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids[2]);
 176         ptoken->sids[3] = dom_sid_parse_talloc(ptoken->sids, SID_NT_NETWORK);
 177         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids[3]);
 178         ptoken->num_sids = 4;
 179
 180         if (is_authenticated) {
 181                 ptoken->sids[4] = dom_sid_parse_talloc(ptoken->sids, SID_NT_AUTHENTICATED_USERS);
 182                 NT_STATUS_HAVE_NO_MEMORY(ptoken->sids[4]);
 183                 ptoken->num_sids++;
 184         }
 185
 186         for (i = 0; i < n_groupSIDs; i++) {
 187                 size_t check_sid_idx;
 188                 for (check_sid_idx = 1;
 189                      check_sid_idx < ptoken->num_sids;
 190                      check_sid_idx++) {
 191                         if (dom_sid_equal(ptoken->sids[check_sid_idx], groupSIDs[i])) {
 192                                 break;
 193                         }
 194                 }
 195
 196                 if (check_sid_idx == ptoken->num_sids) {
 197                         ptoken->sids[ptoken->num_sids++] = talloc_reference(ptoken->sids, groupSIDs[i]);
 198                 }
 199         }
 200
 201         /* setup the privilege mask for this token */
 202         status = samdb_privilege_setup(ev_ctx, lp_ctx, ptoken);
 203         if (!NT_STATUS_IS_OK(status)) {
 204                 talloc_free(ptoken);
 205                 return status;
 206         }
 207
 208         security_token_debug(10, ptoken);
 209
 210         *token = ptoken;
 211
 212         return NT_STATUS_OK;
 213 }