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/credentials/credentials.h"
  30 #include "param/param.h"
  31 #include "auth/session_proto.h"
  32
  33 _PUBLIC_ struct auth_session_info *anonymous_session(TALLOC_CTX *mem_ctx,
  34                                             struct loadparm_context *lp_ctx)
  35 {
  36         NTSTATUS nt_status;
  37         struct auth_session_info *session_info = NULL;
  38         nt_status = auth_anonymous_session_info(mem_ctx, lp_ctx, &session_info);
  39         if (!NT_STATUS_IS_OK(nt_status)) {
  40                 return NULL;
  41         }
  42         return session_info;
  43 }
  44
  45 _PUBLIC_ NTSTATUS auth_generate_session_info(TALLOC_CTX *mem_ctx,
  46                                              struct auth_context *auth_context,
  47                                              struct auth_serversupplied_info *server_info,
  48                                              struct auth_session_info **_session_info)
  49 {
  50         struct auth_session_info *session_info;
  51         NTSTATUS nt_status;
  52         unsigned int i, num_groupSIDs = 0;
  53         const char *account_sid_string;
  54         const char *account_sid_dn;
  55         DATA_BLOB account_sid_blob;
  56         const char *primary_group_string;
  57         const char *primary_group_dn;
  58         DATA_BLOB primary_group_blob;
  59
  60         const char *filter;
  61
  62         struct dom_sid **groupSIDs = NULL;
  63         const struct dom_sid *dom_sid;
  64         bool is_enterprise_dc = false;
  65
  66         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
  67         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
  68
  69         if (!auth_context->sam_ctx) {
  70                 DEBUG(0, ("No SAM available, cannot determine local groups\n"));
  71                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
  72         }
  73
  74         /* For now, we don't have trusted domains, so we do a very
  75          * simple check to see that the user's SID is in *this*
  76          * domain, and then trust the user account control.  When we
  77          * get trusted domains, we should check it's a trusted domain
  78          * in this forest.  This elaborate check is to try and avoid a
  79          * nasty security bug if we forget about this later... */
  80
  81         if (server_info->acct_flags & ACB_SVRTRUST) {
  82                 dom_sid = samdb_domain_sid(auth_context->sam_ctx);
  83                 if (dom_sid) {
  84                         if (dom_sid_in_domain(dom_sid, server_info->account_sid)) {
  85                                 is_enterprise_dc = true;
  86                         } else {
  87                                 DEBUG(2, ("DC %s is not in our domain.  "
  88                                           "It will not have Enterprise Domain Controllers membership on this server",
  89                                           server_info->account_name));
  90                         }
  91                 } else {
  92                         DEBUG(2, ("Could not obtain local domain SID, "
  93                                   "so can not determine if DC %s is a DC of this domain.  "
  94                                   "It will not have Enterprise Domain Controllers membership",
  95                                   server_info->account_name));
  96                 }
  97         }
  98
  99         groupSIDs = talloc_array(tmp_ctx, struct dom_sid *, server_info->n_domain_groups);
 100         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(groupSIDs, tmp_ctx);
 101         if (!groupSIDs) {
 102                 talloc_free(tmp_ctx);
 103                 return NT_STATUS_NO_MEMORY;
 104         }
 105
 106         num_groupSIDs = server_info->n_domain_groups;
 107
 108         for (i=0; i < server_info->n_domain_groups; i++) {
 109                 groupSIDs[i] = server_info->domain_groups[i];
 110         }
 111
 112         filter = talloc_asprintf(tmp_ctx, "(&(objectClass=group)(groupType:1.2.840.113556.1.4.803:=%u))",
 113                                  GROUP_TYPE_BUILTIN_LOCAL_GROUP);
 114
 115         session_info = talloc(tmp_ctx, struct auth_session_info);
 116         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(session_info, tmp_ctx);
 117
 118         session_info->server_info = talloc_reference(session_info, server_info);
 119
 120         /* unless set otherwise, the session key is the user session
 121          * key from the auth subsystem */
 122         session_info->session_key = server_info->user_session_key;
 123
 124         /* Search for each group in the token */
 125
 126         /* Expands the account SID - this function takes in
 127          * memberOf-like values, so we fake one up with the
 128          * <SID=S-...> format of DN and then let it expand
 129          * them, as long as they meet the filter - so only
 130          * builtin groups
 131          *
 132          * We already have the primary group in the token, so set
 133          * 'only childs' flag to true
 134          */
 135         account_sid_string = dom_sid_string(tmp_ctx, server_info->account_sid);
 136         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(account_sid_string, server_info);
 137
 138         account_sid_dn = talloc_asprintf(tmp_ctx, "<SID=%s>", account_sid_string);
 139         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(account_sid_dn, server_info);
 140
 141         account_sid_blob = data_blob_string_const(account_sid_dn);
 142
 143         nt_status = authsam_expand_nested_groups(auth_context->sam_ctx, &account_sid_blob, true, filter,
 144                                               tmp_ctx, &groupSIDs, &num_groupSIDs);
 145         if (!NT_STATUS_IS_OK(nt_status)) {
 146                 talloc_free(tmp_ctx);
 147                 return nt_status;
 148         }
 149
 150         /* Expands the primary group - this function takes in
 151          * memberOf-like values, so we fake one up with the
 152          * <SID=S-...> format of DN and then let it expand
 153          * them, as long as they meet the filter - so only
 154          * builtin groups
 155          *
 156          * We already have the primary group in the token, so set
 157          * 'only childs' flag to true
 158          */
 159         primary_group_string = dom_sid_string(tmp_ctx, server_info->primary_group_sid);
 160         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(primary_group_string, server_info);
 161
 162         primary_group_dn = talloc_asprintf(tmp_ctx, "<SID=%s>", primary_group_string);
 163         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(primary_group_dn, server_info);
 164
 165         primary_group_blob = data_blob_string_const(primary_group_dn);
 166
 167         nt_status = authsam_expand_nested_groups(auth_context->sam_ctx, &primary_group_blob, true, filter,
 168                                               tmp_ctx, &groupSIDs, &num_groupSIDs);
 169         if (!NT_STATUS_IS_OK(nt_status)) {
 170                 talloc_free(tmp_ctx);
 171                 return nt_status;
 172         }
 173
 174         for (i = 0; i < server_info->n_domain_groups; i++) {
 175                 const char *group_string;
 176                 const char *group_dn;
 177                 DATA_BLOB group_blob;
 178                 group_string = dom_sid_string(tmp_ctx, server_info->domain_groups[i]);
 179                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(group_string, server_info);
 180
 181                 group_dn = talloc_asprintf(tmp_ctx, "<SID=%s>", group_string);
 182                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(group_dn, server_info);
 183
 184                 group_blob = data_blob_string_const(group_dn);
 185
 186                 /* This function takes in memberOf values and expands
 187                  * them, as long as they meet the filter - so only
 188                  * builtin groups */
 189                 nt_status = authsam_expand_nested_groups(auth_context->sam_ctx, &group_blob, true, filter,
 190                                                       tmp_ctx, &groupSIDs, &num_groupSIDs);
 191                 if (!NT_STATUS_IS_OK(nt_status)) {
 192                         talloc_free(tmp_ctx);
 193                         return nt_status;
 194                 }
 195         }
 196
 197         nt_status = security_token_create(session_info,
 198                                           auth_context->event_ctx,
 199                                           auth_context->lp_ctx,
 200                                           server_info->account_sid,
 201                                           server_info->primary_group_sid,
 202                                           num_groupSIDs,
 203                                           groupSIDs,
 204                                           server_info->authenticated,
 205                                           is_enterprise_dc,
 206                                           &session_info->security_token);
 207         NT_STATUS_NOT_OK_RETURN_AND_FREE(nt_status, tmp_ctx);
 208
 209         session_info->credentials = NULL;
 210
 211         talloc_steal(mem_ctx, session_info);
 212         *_session_info = session_info;
 213         return NT_STATUS_OK;
 214 }
 215
 216 /**
 217  * prints a struct auth_session_info security token to debug output.
 218  */
 219 void auth_session_info_debug(int dbg_lev,
 220                              const struct auth_session_info *session_info)
 221 {
 222         if (!session_info) {
 223                 DEBUG(dbg_lev, ("Session Info: (NULL)\n"));
 224                 return;
 225         }
 226
 227         security_token_debug(dbg_lev, session_info->security_token);
 228 }
 229