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 #include "auth/auth.h"
  45
  46 char *samdb_relative_path(struct ldb_context *ldb,
  47                                  TALLOC_CTX *mem_ctx,
  48                                  const char *name)
  49 {
  50         const char *base_url =
  51                 (const char *)ldb_get_opaque(ldb, "ldb_url");
  52         char *path, *p, *full_name;
  53         if (name == NULL) {
  54                 return NULL;
  55         }
  56         if (strncmp("tdb://", base_url, 6) == 0) {
  57                 base_url = base_url+6;
  58         }
  59         path = talloc_strdup(mem_ctx, base_url);
  60         if (path == NULL) {
  61                 return NULL;
  62         }
  63         if ( (p = strrchr(path, '/')) != NULL) {
  64                 p[0] = '\0';
  65                 full_name = talloc_asprintf(mem_ctx, "%s/%s", path, name);
  66         } else {
  67                 full_name = talloc_asprintf(mem_ctx, "./%s", name);
  68         }
  69         talloc_free(path);
  70         return full_name;
  71 }
  72
  73 /*
  74   make sure the static credentials are not freed
  75  */
  76 static int samdb_credentials_destructor(struct cli_credentials *creds)
  77 {
  78         return -1;
  79 }
  80
  81 /*
  82   this returns a static set of system credentials. It is static so
  83   that we always get the same pointer in ldb_wrap_connect()
  84  */
  85 struct cli_credentials *samdb_credentials(struct tevent_context *event_ctx,
  86                                           struct loadparm_context *lp_ctx)
  87 {
  88         static struct cli_credentials *static_credentials;
  89         struct cli_credentials *cred;
  90         char *error_string;
  91
  92         if (static_credentials) {
  93                 return static_credentials;
  94         }
  95
  96         cred = cli_credentials_init(talloc_autofree_context());
  97         if (!cred) {
  98                 return NULL;
  99         }
 100         cli_credentials_set_conf(cred, lp_ctx);
 101
 102         /* We don't want to use krb5 to talk to our samdb - recursion
 103          * here would be bad, and this account isn't in the KDC
 104          * anyway */
 105         cli_credentials_set_kerberos_state(cred, CRED_DONT_USE_KERBEROS);
 106
 107         if (!NT_STATUS_IS_OK(cli_credentials_set_secrets(cred, event_ctx, lp_ctx, NULL, NULL,
 108                                                          SECRETS_LDAP_FILTER, &error_string))) {
 109                 DEBUG(5, ("(normal if no LDAP backend) %s", error_string));
 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                                unsigned int n_groupSIDs,
 149                                struct dom_sid **groupSIDs,
 150                                uint32_t session_info_flags,
 151                                struct security_token **token)
 152 {
 153         struct security_token *ptoken;
 154         unsigned int i;
 155         NTSTATUS status;
 156
 157         ptoken = security_token_initialise(mem_ctx);
 158         NT_STATUS_HAVE_NO_MEMORY(ptoken);
 159
 160         ptoken->user_sid = talloc_reference(ptoken, user_sid);
 161         ptoken->group_sid = talloc_reference(ptoken, group_sid);
 162         ptoken->privilege_mask = 0;
 163
 164         ptoken->sids = talloc_array(ptoken, struct dom_sid *, n_groupSIDs + 6 /* over-allocate */);
 165         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 166
 167         ptoken->num_sids = 1;
 168
 169         ptoken->sids = talloc_realloc(ptoken, ptoken->sids, struct dom_sid *, ptoken->num_sids + 1);
 170         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 171
 172         ptoken->sids[0] = ptoken->user_sid;
 173         ptoken->sids[1] = ptoken->group_sid;
 174         ptoken->num_sids++;
 175
 176         /*
 177          * Finally add the "standard" SIDs.
 178          * The only difference between guest and "anonymous"
 179          * is the addition of Authenticated_Users.
 180          */
 181
 182         if (session_info_flags & AUTH_SESSION_INFO_DEFAULT_GROUPS) {
 183                 ptoken->sids = talloc_realloc(ptoken, ptoken->sids, struct dom_sid *, ptoken->num_sids + 1);
 184                 NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 185
 186                 ptoken->sids[ptoken->num_sids] = dom_sid_parse_talloc(ptoken->sids, SID_WORLD);
 187                 NT_STATUS_HAVE_NO_MEMORY(ptoken->sids[ptoken->num_sids]);
 188                 ptoken->num_sids++;
 189
 190                 ptoken->sids = talloc_realloc(ptoken, ptoken->sids, struct dom_sid *, ptoken->num_sids + 1);
 191                 NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 192
 193                 ptoken->sids[ptoken->num_sids] = dom_sid_parse_talloc(ptoken->sids, SID_NT_NETWORK);
 194                 NT_STATUS_HAVE_NO_MEMORY(ptoken->sids[ptoken->num_sids]);
 195                 ptoken->num_sids++;
 196
 197
 198         }
 199
 200         if (session_info_flags & AUTH_SESSION_INFO_AUTHENTICATED) {
 201                 ptoken->sids = talloc_realloc(ptoken, ptoken->sids, struct dom_sid *, ptoken->num_sids + 1);
 202                 NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 203
 204                 ptoken->sids[ptoken->num_sids] = dom_sid_parse_talloc(ptoken->sids, SID_NT_AUTHENTICATED_USERS);
 205                 NT_STATUS_HAVE_NO_MEMORY(ptoken->sids[ptoken->num_sids]);
 206                 ptoken->num_sids++;
 207         }
 208
 209         if (session_info_flags & AUTH_SESSION_INFO_ENTERPRISE_DC) {
 210                 ptoken->sids = talloc_realloc(ptoken, ptoken->sids, struct dom_sid *, ptoken->num_sids + 1);
 211                 NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 212
 213                 ptoken->sids[ptoken->num_sids] = dom_sid_parse_talloc(ptoken->sids, SID_NT_ENTERPRISE_DCS);
 214                 NT_STATUS_HAVE_NO_MEMORY(ptoken->sids[ptoken->num_sids]);
 215                 ptoken->num_sids++;
 216         }
 217
 218         for (i = 0; i < n_groupSIDs; i++) {
 219                 size_t check_sid_idx;
 220                 for (check_sid_idx = 1;
 221                      check_sid_idx < ptoken->num_sids;
 222                      check_sid_idx++) {
 223                         if (dom_sid_equal(ptoken->sids[check_sid_idx], groupSIDs[i])) {
 224                                 break;
 225                         }
 226                 }
 227
 228                 if (check_sid_idx == ptoken->num_sids) {
 229                         ptoken->sids = talloc_realloc(ptoken, ptoken->sids, struct dom_sid *, ptoken->num_sids + 1);
 230                         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 231
 232                         ptoken->sids[ptoken->num_sids] = talloc_reference(ptoken->sids, groupSIDs[i]);
 233                         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids[ptoken->num_sids]);
 234                         ptoken->num_sids++;
 235
 236                 }
 237         }
 238
 239         /* setup the privilege mask for this token */
 240         status = samdb_privilege_setup(ev_ctx, lp_ctx, ptoken);
 241         if (!NT_STATUS_IS_OK(status)) {
 242                 talloc_free(ptoken);
 243                 return status;
 244         }
 245
 246         security_token_debug(10, ptoken);
 247
 248         *token = ptoken;
 249
 250         return NT_STATUS_OK;
 251 }