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                                   int flags)
 128 {
 129         struct ldb_context *ldb;
 130         struct dsdb_schema *schema;
 131         ldb = ldb_wrap_connect(mem_ctx, ev_ctx, lp_ctx,
 132                                lpcfg_sam_url(lp_ctx), session_info,
 133                                samdb_credentials(ev_ctx, lp_ctx),
 134                                flags);
 135
 136         if (!ldb) {
 137                 return NULL;
 138         }
 139
 140         schema = dsdb_get_schema(ldb, NULL);
 141         /* make the resulting schema global */
 142         if (schema) {
 143                 dsdb_make_schema_global(ldb, schema);
 144         }
 145
 146         return ldb;
 147 }
 148
 149
 150 /****************************************************************************
 151  Create the SID list for this user.
 152 ****************************************************************************/
 153 NTSTATUS security_token_create(TALLOC_CTX *mem_ctx,
 154                                struct tevent_context *ev_ctx,
 155                                struct loadparm_context *lp_ctx,
 156                                struct dom_sid *user_sid,
 157                                struct dom_sid *group_sid,
 158                                unsigned int n_groupSIDs,
 159                                struct dom_sid **groupSIDs,
 160                                uint32_t session_info_flags,
 161                                struct security_token **token)
 162 {
 163         struct security_token *ptoken;
 164         unsigned int i;
 165         NTSTATUS status;
 166
 167         ptoken = security_token_initialise(mem_ctx);
 168         NT_STATUS_HAVE_NO_MEMORY(ptoken);
 169
 170         ptoken->sids = talloc_array(ptoken, struct dom_sid, n_groupSIDs + 6 /* over-allocate */);
 171         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 172
 173         ptoken->num_sids = 1;
 174
 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[PRIMARY_USER_SID_INDEX] = *user_sid;
 179         if (!dom_sid_equal(user_sid, group_sid)) {
 180                 ptoken->sids[PRIMARY_GROUP_SID_INDEX] = *group_sid;
 181                 ptoken->num_sids++;
 182         }
 183
 184         /*
 185          * Finally add the "standard" SIDs.
 186          * The only difference between guest and "anonymous"
 187          * is the addition of Authenticated_Users.
 188          */
 189
 190         if (session_info_flags & AUTH_SESSION_INFO_DEFAULT_GROUPS) {
 191                 ptoken->sids = talloc_realloc(ptoken, ptoken->sids, struct dom_sid, ptoken->num_sids + 2);
 192                 NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 193
 194                 if (!dom_sid_parse(SID_WORLD, &ptoken->sids[ptoken->num_sids])) {
 195                         return NT_STATUS_INTERNAL_ERROR;
 196                 }
 197                 ptoken->num_sids++;
 198
 199                 if (!dom_sid_parse(SID_NT_NETWORK, &ptoken->sids[ptoken->num_sids])) {
 200                         return NT_STATUS_INTERNAL_ERROR;
 201                 }
 202                 ptoken->num_sids++;
 203         }
 204
 205         if (session_info_flags & AUTH_SESSION_INFO_AUTHENTICATED) {
 206                 ptoken->sids = talloc_realloc(ptoken, ptoken->sids, struct dom_sid, ptoken->num_sids + 1);
 207                 NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 208
 209                 if (!dom_sid_parse(SID_NT_AUTHENTICATED_USERS, &ptoken->sids[ptoken->num_sids])) {
 210                         return NT_STATUS_INTERNAL_ERROR;
 211                 }
 212                 ptoken->num_sids++;
 213         }
 214
 215         for (i = 0; i < n_groupSIDs; i++) {
 216                 size_t check_sid_idx;
 217                 for (check_sid_idx = 1;
 218                      check_sid_idx < ptoken->num_sids;
 219                      check_sid_idx++) {
 220                         if (dom_sid_equal(&ptoken->sids[check_sid_idx], groupSIDs[i])) {
 221                                 break;
 222                         }
 223                 }
 224
 225                 if (check_sid_idx == ptoken->num_sids) {
 226                         ptoken->sids = talloc_realloc(ptoken, ptoken->sids, struct dom_sid, ptoken->num_sids + 1);
 227                         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
 228
 229                         ptoken->sids[ptoken->num_sids] = *groupSIDs[i];
 230                         ptoken->num_sids++;
 231                 }
 232         }
 233
 234         /* setup the privilege mask for this token */
 235         status = samdb_privilege_setup(ev_ctx, lp_ctx, ptoken);
 236         if (!NT_STATUS_IS_OK(status)) {
 237                 talloc_free(ptoken);
 238                 return status;
 239         }
 240
 241         security_token_debug(10, ptoken);
 242
 243         *token = ptoken;
 244
 245         return NT_STATUS_OK;
 246 }