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,
  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 *dom_sid;
  63
  64         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
  65         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
  66
  67         if (!auth_context->sam_ctx) {
  68                 DEBUG(0, ("No SAM available, cannot determine local groups\n"));
  69                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
  70         }
  71
  72         /* For now, we don't have trusted domains, so we do a very
  73          * simple check to see that the user's SID is in *this*
  74          * domain, and then trust the user account control.  When we
  75          * get trusted domains, we should check it's a trusted domain
  76          * in this forest.  This elaborate check is to try and avoid a
  77          * nasty security bug if we forget about this later... */
  78
  79         if (server_info->acct_flags & ACB_SVRTRUST) {
  80                 dom_sid = samdb_domain_sid(auth_context->sam_ctx);
  81                 if (dom_sid) {
  82                         if (dom_sid_in_domain(dom_sid, server_info->account_sid)) {
  83                                 session_info_flags |= AUTH_SESSION_INFO_ENTERPRISE_DC;
  84                         } else {
  85                                 DEBUG(2, ("DC %s is not in our domain.  "
  86                                           "It will not have Enterprise Domain Controllers membership on this server",
  87                                           server_info->account_name));
  88                         }
  89                 } else {
  90                         DEBUG(2, ("Could not obtain local domain SID, "
  91                                   "so can not determine if DC %s is a DC of this domain.  "
  92                                   "It will not have Enterprise Domain Controllers membership",
  93                                   server_info->account_name));
  94                 }
  95         }
  96
  97         groupSIDs = talloc_array(tmp_ctx, struct dom_sid *, server_info->n_domain_groups);
  98         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(groupSIDs, tmp_ctx);
  99         if (!groupSIDs) {
 100                 talloc_free(tmp_ctx);
 101                 return NT_STATUS_NO_MEMORY;
 102         }
 103
 104         num_groupSIDs = server_info->n_domain_groups;
 105
 106         for (i=0; i < server_info->n_domain_groups; i++) {
 107                 groupSIDs[i] = server_info->domain_groups[i];
 108         }
 109
 110         filter = talloc_asprintf(tmp_ctx, "(&(objectClass=group)(groupType:1.2.840.113556.1.4.803:=%u))",
 111                                  GROUP_TYPE_BUILTIN_LOCAL_GROUP);
 112
 113         session_info = talloc(tmp_ctx, struct auth_session_info);
 114         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(session_info, tmp_ctx);
 115
 116         session_info->server_info = talloc_reference(session_info, server_info);
 117
 118         /* unless set otherwise, the session key is the user session
 119          * key from the auth subsystem */
 120         session_info->session_key = server_info->user_session_key;
 121
 122         /* Search for each group in the token */
 123
 124         /* Expands the account SID - this function takes in
 125          * memberOf-like values, so we fake one up with the
 126          * <SID=S-...> format of DN and then let it expand
 127          * them, as long as they meet the filter - so only
 128          * builtin groups
 129          *
 130          * We already have the primary group in the token, so set
 131          * 'only childs' flag to true
 132          */
 133         account_sid_string = dom_sid_string(tmp_ctx, server_info->account_sid);
 134         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(account_sid_string, server_info);
 135
 136         account_sid_dn = talloc_asprintf(tmp_ctx, "<SID=%s>", account_sid_string);
 137         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(account_sid_dn, server_info);
 138
 139         account_sid_blob = data_blob_string_const(account_sid_dn);
 140
 141         nt_status = authsam_expand_nested_groups(auth_context->sam_ctx, &account_sid_blob, true, filter,
 142                                               tmp_ctx, &groupSIDs, &num_groupSIDs);
 143         if (!NT_STATUS_IS_OK(nt_status)) {
 144                 talloc_free(tmp_ctx);
 145                 return nt_status;
 146         }
 147
 148         /* Expands the primary group - this function takes in
 149          * memberOf-like values, so we fake one up with the
 150          * <SID=S-...> format of DN and then let it expand
 151          * them, as long as they meet the filter - so only
 152          * builtin groups
 153          *
 154          * We already have the primary group in the token, so set
 155          * 'only childs' flag to true
 156          */
 157         primary_group_string = dom_sid_string(tmp_ctx, server_info->primary_group_sid);
 158         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(primary_group_string, server_info);
 159
 160         primary_group_dn = talloc_asprintf(tmp_ctx, "<SID=%s>", primary_group_string);
 161         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(primary_group_dn, server_info);
 162
 163         primary_group_blob = data_blob_string_const(primary_group_dn);
 164
 165         nt_status = authsam_expand_nested_groups(auth_context->sam_ctx, &primary_group_blob, true, filter,
 166                                               tmp_ctx, &groupSIDs, &num_groupSIDs);
 167         if (!NT_STATUS_IS_OK(nt_status)) {
 168                 talloc_free(tmp_ctx);
 169                 return nt_status;
 170         }
 171
 172         for (i = 0; i < server_info->n_domain_groups; i++) {
 173                 const char *group_string;
 174                 const char *group_dn;
 175                 DATA_BLOB group_blob;
 176                 group_string = dom_sid_string(tmp_ctx, server_info->domain_groups[i]);
 177                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(group_string, server_info);
 178
 179                 group_dn = talloc_asprintf(tmp_ctx, "<SID=%s>", group_string);
 180                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(group_dn, server_info);
 181
 182                 group_blob = data_blob_string_const(group_dn);
 183
 184                 /* This function takes in memberOf values and expands
 185                  * them, as long as they meet the filter - so only
 186                  * builtin groups */
 187                 nt_status = authsam_expand_nested_groups(auth_context->sam_ctx, &group_blob, true, filter,
 188                                                       tmp_ctx, &groupSIDs, &num_groupSIDs);
 189                 if (!NT_STATUS_IS_OK(nt_status)) {
 190                         talloc_free(tmp_ctx);
 191                         return nt_status;
 192                 }
 193         }
 194
 195         nt_status = security_token_create(session_info,
 196                                           auth_context->event_ctx,
 197                                           auth_context->lp_ctx,
 198                                           server_info->account_sid,
 199                                           server_info->primary_group_sid,
 200                                           num_groupSIDs,
 201                                           groupSIDs,
 202                                           session_info_flags,
 203                                           &session_info->security_token);
 204         NT_STATUS_NOT_OK_RETURN_AND_FREE(nt_status, tmp_ctx);
 205
 206         session_info->credentials = NULL;
 207
 208         talloc_steal(mem_ctx, session_info);
 209         *_session_info = session_info;
 210         return NT_STATUS_OK;
 211 }
 212
 213 /**
 214  * prints a struct auth_session_info security token to debug output.
 215  */
 216 void auth_session_info_debug(int dbg_lev,
 217                              const struct auth_session_info *session_info)
 218 {
 219         if (!session_info) {
 220                 DEBUG(dbg_lev, ("Session Info: (NULL)\n"));
 221                 return;
 222         }
 223
 224         security_token_debug(dbg_lev, session_info->security_token);
 225 }
 226