source4/param/secrets.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Copyright (C) Andrew Tridgell 1992-2001
   4    Copyright (C) Andrew Bartlett      2002
   5    Copyright (C) Rafal Szczesniak     2002
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 /* the Samba secrets database stores any generated, private information
  22    such as the local SID and machine trust password */
  23
  24 #include "includes.h"
  25 #include "secrets.h"
  26 #include "param/param.h"
  27 #include "system/filesys.h"
  28 #include "lib/tdb_wrap/tdb_wrap.h"
  29 #include "lib/ldb-samba/ldb_wrap.h"
  30 #include <ldb.h>
  31 #include "../lib/util/util_tdb.h"
  32 #include "librpc/gen_ndr/ndr_security.h"
  33 #include "dsdb/samdb/samdb.h"
  34
  35 /**
  36   create or connect to the secrets ldb
  37 */
  38 struct ldb_context *secrets_db_create(TALLOC_CTX *mem_ctx,
  39                                       struct loadparm_context *lp_ctx)
  40 {
  41         return ldb_wrap_connect(mem_ctx, NULL, lp_ctx, "secrets.ldb",
  42                                NULL, NULL, 0);
  43 }
  44
  45 /**
  46   connect to the secrets ldb
  47 */
  48 struct ldb_context *secrets_db_connect(TALLOC_CTX *mem_ctx,
  49                                         struct loadparm_context *lp_ctx)
  50 {
  51         return ldb_wrap_connect(mem_ctx, NULL, lp_ctx, "secrets.ldb",
  52                                NULL, NULL, LDB_FLG_DONT_CREATE_DB);
  53 }
  54
  55 /**
  56  * Retrieve the domain SID from the secrets database.
  57  * @return pointer to a SID object if the SID could be obtained, NULL otherwise
  58  */
  59 struct dom_sid *secrets_get_domain_sid(TALLOC_CTX *mem_ctx,
  60                                        struct loadparm_context *lp_ctx,
  61                                        const char *domain,
  62                                        enum netr_SchannelType *sec_channel_type,
  63                                        char **errstring)
  64 {
  65         struct ldb_context *ldb;
  66         struct ldb_message *msg;
  67         int ldb_ret;
  68         const char *attrs[] = { "objectSid", "secureChannelType", NULL };
  69         struct dom_sid *result = NULL;
  70         const struct ldb_val *v;
  71         enum ndr_err_code ndr_err;
  72
  73         *errstring = NULL;
  74
  75         ldb = secrets_db_connect(mem_ctx, lp_ctx);
  76         if (ldb == NULL) {
  77                 DEBUG(5, ("secrets_db_connect failed\n"));
  78                 return NULL;
  79         }
  80
  81         ldb_ret = dsdb_search_one(ldb, ldb, &msg,
  82                               ldb_dn_new(mem_ctx, ldb, SECRETS_PRIMARY_DOMAIN_DN),
  83                               LDB_SCOPE_ONELEVEL,
  84                               attrs, 0, SECRETS_PRIMARY_DOMAIN_FILTER, domain);
  85
  86         if (ldb_ret != LDB_SUCCESS) {
  87                 *errstring = talloc_asprintf(mem_ctx, "Failed to find record for %s in %s: %s: %s",
  88                                              domain, (char *) ldb_get_opaque(ldb, "ldb_url"),
  89                                              ldb_strerror(ldb_ret), ldb_errstring(ldb));
  90                 return NULL;
  91         }
  92         v = ldb_msg_find_ldb_val(msg, "objectSid");
  93         if (v == NULL) {
  94                 *errstring = talloc_asprintf(mem_ctx, "Failed to find a SID on record for %s in %s",
  95                                              domain, (char *) ldb_get_opaque(ldb, "ldb_url"));
  96                 return NULL;
  97         }
  98
  99         if (sec_channel_type) {
 100                 int t;
 101                 t = ldb_msg_find_attr_as_int(msg, "secureChannelType", -1);
 102                 if (t == -1) {
 103                         *errstring = talloc_asprintf(mem_ctx, "Failed to find secureChannelType for %s in %s",
 104                                                      domain, (char *) ldb_get_opaque(ldb, "ldb_url"));
 105                         return NULL;
 106                 }
 107                 *sec_channel_type = t;
 108         }
 109
 110         result = talloc(mem_ctx, struct dom_sid);
 111         if (result == NULL) {
 112                 talloc_free(ldb);
 113                 return NULL;
 114         }
 115
 116         ndr_err = ndr_pull_struct_blob(v, result, result,
 117                                        (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
 118         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 119                 *errstring = talloc_asprintf(mem_ctx, "Failed to parse SID on record for %s in %s",
 120                                              domain, (char *) ldb_get_opaque(ldb, "ldb_url"));
 121                 talloc_free(result);
 122                 talloc_free(ldb);
 123                 return NULL;
 124         }
 125
 126         return result;
 127 }
 128
 129 char *keytab_name_from_msg(TALLOC_CTX *mem_ctx, struct ldb_context *ldb, struct ldb_message *msg)
 130 {
 131         const char *krb5keytab = ldb_msg_find_attr_as_string(msg, "krb5Keytab", NULL);
 132         if (krb5keytab) {
 133                 return talloc_strdup(mem_ctx, krb5keytab);
 134         } else {
 135                 char *file_keytab;
 136                 char *relative_path;
 137                 const char *privateKeytab = ldb_msg_find_attr_as_string(msg, "privateKeytab", NULL);
 138                 if (!privateKeytab) {
 139                         return NULL;
 140                 }
 141
 142                 relative_path = ldb_relative_path(ldb, mem_ctx, privateKeytab);
 143                 if (!relative_path) {
 144                         return NULL;
 145                 }
 146                 file_keytab = talloc_asprintf(mem_ctx, "FILE:%s", relative_path);
 147                 talloc_free(relative_path);
 148                 return file_keytab;
 149         }
 150         return NULL;
 151 }
 152