source4/auth/session.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Authentication utility functions
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Andrew Bartlett 2001-2010
   6    Copyright (C) Jeremy Allison 2000-2001
   7    Copyright (C) Rafal Szczesniak 2002
   8    Copyright (C) Stefan Metzmacher 2005
   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 "auth/auth.h"
  26 #include "libcli/security/security.h"
  27 #include "libcli/auth/libcli_auth.h"
  28 #include "dsdb/samdb/samdb.h"
  29 #include "auth/session_proto.h"
  30
  31 _PUBLIC_ struct auth_session_info *anonymous_session(TALLOC_CTX *mem_ctx,
  32                                             struct loadparm_context *lp_ctx)
  33 {
  34         NTSTATUS nt_status;
  35         struct auth_session_info *session_info = NULL;
  36         nt_status = auth_anonymous_session_info(mem_ctx, lp_ctx, &session_info);
  37         if (!NT_STATUS_IS_OK(nt_status)) {
  38                 return NULL;
  39         }
  40         return session_info;
  41 }
  42
  43 _PUBLIC_ NTSTATUS auth_generate_session_info(TALLOC_CTX *mem_ctx,
  44                                              struct auth_context *auth_context, /* Optional if the domain SID is in the NT AUTHORITY domain */
  45                                              struct auth_serversupplied_info *server_info,
  46                                              uint32_t session_info_flags,
  47                                              struct auth_session_info **_session_info)
  48 {
  49         struct auth_session_info *session_info;
  50         NTSTATUS nt_status;
  51         unsigned int i, num_groupSIDs = 0;
  52         const char *account_sid_string;
  53         const char *account_sid_dn;
  54         DATA_BLOB account_sid_blob;
  55         const char *primary_group_string;
  56         const char *primary_group_dn;
  57         DATA_BLOB primary_group_blob;
  58
  59         const char *filter;
  60
  61         struct dom_sid **groupSIDs = NULL;
  62         const struct dom_sid *anonymous_sid, *system_sid;
  63
  64         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
  65         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
  66
  67         session_info = talloc(tmp_ctx, struct auth_session_info);
  68         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(session_info, tmp_ctx);
  69
  70         session_info->server_info = talloc_reference(session_info, server_info);
  71
  72         /* unless set otherwise, the session key is the user session
  73          * key from the auth subsystem */
  74         session_info->session_key = server_info->user_session_key;
  75
  76         anonymous_sid = dom_sid_parse_talloc(tmp_ctx, SID_NT_ANONYMOUS);
  77         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(anonymous_sid, tmp_ctx);
  78
  79         system_sid = dom_sid_parse_talloc(tmp_ctx, SID_NT_SYSTEM);
  80         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(system_sid, tmp_ctx);
  81
  82         if (dom_sid_equal(anonymous_sid, server_info->account_sid)) {
  83                 /* Don't expand nested groups of system, anonymous etc*/
  84         } else if (dom_sid_equal(system_sid, server_info->account_sid)) {
  85                 /* Don't expand nested groups of system, anonymous etc*/
  86         } else if (auth_context) {
  87                 groupSIDs = talloc_array(tmp_ctx, struct dom_sid *, server_info->n_domain_groups);
  88                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(groupSIDs, tmp_ctx);
  89                 if (!groupSIDs) {
  90                         talloc_free(tmp_ctx);
  91                         return NT_STATUS_NO_MEMORY;
  92                 }
  93
  94                 num_groupSIDs = server_info->n_domain_groups;
  95
  96                 for (i=0; i < server_info->n_domain_groups; i++) {
  97                         groupSIDs[i] = server_info->domain_groups[i];
  98                 }
  99
 100                 filter = talloc_asprintf(tmp_ctx, "(&(objectClass=group)(groupType:1.2.840.113556.1.4.803:=%u))",
 101                                          GROUP_TYPE_BUILTIN_LOCAL_GROUP);
 102
 103                 /* Search for each group in the token */
 104
 105                 /* Expands the account SID - this function takes in
 106                  * memberOf-like values, so we fake one up with the
 107                  * <SID=S-...> format of DN and then let it expand
 108                  * them, as long as they meet the filter - so only
 109                  * builtin groups
 110                  *
 111                  * We already have the primary group in the token, so set
 112                  * 'only childs' flag to true
 113                  */
 114                 account_sid_string = dom_sid_string(tmp_ctx, server_info->account_sid);
 115                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(account_sid_string, server_info);
 116
 117                 account_sid_dn = talloc_asprintf(tmp_ctx, "<SID=%s>", account_sid_string);
 118                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(account_sid_dn, server_info);
 119
 120                 account_sid_blob = data_blob_string_const(account_sid_dn);
 121
 122                 nt_status = authsam_expand_nested_groups(auth_context->sam_ctx, &account_sid_blob, true, filter,
 123                                                          tmp_ctx, &groupSIDs, &num_groupSIDs);
 124                 if (!NT_STATUS_IS_OK(nt_status)) {
 125                         talloc_free(tmp_ctx);
 126                         return nt_status;
 127                 }
 128
 129                 /* Expands the primary group - this function takes in
 130                  * memberOf-like values, so we fake one up with the
 131                  * <SID=S-...> format of DN and then let it expand
 132                  * them, as long as they meet the filter - so only
 133                  * builtin groups
 134                  *
 135                  * We already have the primary group in the token, so set
 136                  * 'only childs' flag to true
 137                  */
 138                 primary_group_string = dom_sid_string(tmp_ctx, server_info->primary_group_sid);
 139                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(primary_group_string, server_info);
 140
 141                 primary_group_dn = talloc_asprintf(tmp_ctx, "<SID=%s>", primary_group_string);
 142                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(primary_group_dn, server_info);
 143
 144                 primary_group_blob = data_blob_string_const(primary_group_dn);
 145
 146                 nt_status = authsam_expand_nested_groups(auth_context->sam_ctx, &primary_group_blob, true, filter,
 147                                                          tmp_ctx, &groupSIDs, &num_groupSIDs);
 148                 if (!NT_STATUS_IS_OK(nt_status)) {
 149                         talloc_free(tmp_ctx);
 150                         return nt_status;
 151                 }
 152
 153                 for (i = 0; i < server_info->n_domain_groups; i++) {
 154                         char *group_string;
 155                         const char *group_dn;
 156                         DATA_BLOB group_blob;
 157
 158                         group_string = dom_sid_string(tmp_ctx,
 159                                                       server_info->domain_groups[i]);
 160                         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(group_string, server_info);
 161
 162                         group_dn = talloc_asprintf(tmp_ctx, "<SID=%s>", group_string);
 163                         talloc_free(group_string);
 164                         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(group_dn, server_info);
 165                         group_blob = data_blob_string_const(group_dn);
 166
 167                         /* This function takes in memberOf values and expands
 168                          * them, as long as they meet the filter - so only
 169                          * builtin groups */
 170                         nt_status = authsam_expand_nested_groups(auth_context->sam_ctx, &group_blob, true, filter,
 171                                                                  tmp_ctx, &groupSIDs, &num_groupSIDs);
 172                         if (!NT_STATUS_IS_OK(nt_status)) {
 173                                 talloc_free(tmp_ctx);
 174                                 return nt_status;
 175                         }
 176                 }
 177         }
 178
 179         nt_status = security_token_create(session_info,
 180                                           auth_context ? auth_context->lp_ctx : NULL,
 181                                           server_info->account_sid,
 182                                           server_info->primary_group_sid,
 183                                           num_groupSIDs,
 184                                           groupSIDs,
 185                                           session_info_flags,
 186                                           &session_info->security_token);
 187         NT_STATUS_NOT_OK_RETURN_AND_FREE(nt_status, tmp_ctx);
 188
 189         session_info->credentials = NULL;
 190
 191         talloc_steal(mem_ctx, session_info);
 192         *_session_info = session_info;
 193         talloc_free(tmp_ctx);
 194         return NT_STATUS_OK;
 195 }
 196
 197 /**
 198  * prints a struct auth_session_info security token to debug output.
 199  */
 200 void auth_session_info_debug(int dbg_lev,
 201                              const struct auth_session_info *session_info)
 202 {
 203         if (!session_info) {
 204                 DEBUG(dbg_lev, ("Session Info: (NULL)\n"));
 205                 return;
 206         }
 207
 208         security_token_debug(0, dbg_lev, session_info->security_token);
 209 }
 210