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         return auth_generate_session_info2(mem_ctx,
  50                         auth_context->event_ctx,
  51                         auth_context->lp_ctx,
  52                         server_info,
  53                         _session_info);
  54 }
  55
  56 _PUBLIC_ NTSTATUS auth_generate_session_info2(TALLOC_CTX *mem_ctx,
  57                                              struct tevent_context *event_ctx,
  58                                              struct loadparm_context *lp_ctx,
  59                                              struct auth_serversupplied_info *server_info,
  60                                              struct auth_session_info **_session_info)
  61 {
  62         struct auth_session_info *session_info;
  63         NTSTATUS nt_status;
  64         unsigned int i, num_groupSIDs = 0;
  65         const char *account_sid_string;
  66         const char *account_sid_dn;
  67         DATA_BLOB account_sid_blob;
  68         const char *primary_group_string;
  69         const char *primary_group_dn;
  70         DATA_BLOB primary_group_blob;
  71
  72         const char *filter;
  73
  74         struct dom_sid **groupSIDs = NULL;
  75         const struct dom_sid *dom_sid;
  76
  77         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
  78         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
  79
  80         if (!auth_context->sam_ctx) {
  81                 DEBUG(0, ("No SAM available, cannot determine local groups\n"));
  82                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
  83         }
  84
  85         /* For now, we don't have trusted domains, so we do a very
  86          * simple check to see that the user's SID is in *this*
  87          * domain, and then trust the user account control.  When we
  88          * get trusted domains, we should check it's a trusted domain
  89          * in this forest.  This elaborate check is to try and avoid a
  90          * nasty security bug if we forget about this later... */
  91
  92         if (server_info->acct_flags & ACB_SVRTRUST) {
  93                 dom_sid = samdb_domain_sid(auth_context->sam_ctx);
  94                 if (dom_sid) {
  95                         if (dom_sid_in_domain(dom_sid, server_info->account_sid)) {
  96                                 session_info_flags |= AUTH_SESSION_INFO_ENTERPRISE_DC;
  97                         } else {
  98                                 DEBUG(2, ("DC %s is not in our domain.  "
  99                                           "It will not have Enterprise Domain Controllers membership on this server",
 100                                           server_info->account_name));
 101                         }
 102                 } else {
 103                         DEBUG(2, ("Could not obtain local domain SID, "
 104                                   "so can not determine if DC %s is a DC of this domain.  "
 105                                   "It will not have Enterprise Domain Controllers membership",
 106                                   server_info->account_name));
 107                 }
 108         }
 109
 110         groupSIDs = talloc_array(tmp_ctx, struct dom_sid *, server_info->n_domain_groups);
 111         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(groupSIDs, tmp_ctx);
 112         if (!groupSIDs) {
 113                 talloc_free(tmp_ctx);
 114                 return NT_STATUS_NO_MEMORY;
 115         }
 116
 117         num_groupSIDs = server_info->n_domain_groups;
 118
 119         for (i=0; i < server_info->n_domain_groups; i++) {
 120                 groupSIDs[i] = server_info->domain_groups[i];
 121         }
 122
 123         filter = talloc_asprintf(tmp_ctx, "(&(objectClass=group)(groupType:1.2.840.113556.1.4.803:=%u))",
 124                                  GROUP_TYPE_BUILTIN_LOCAL_GROUP);
 125
 126         session_info = talloc(tmp_ctx, struct auth_session_info);
 127         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(session_info, tmp_ctx);
 128
 129         session_info->server_info = talloc_reference(session_info, server_info);
 130
 131         /* unless set otherwise, the session key is the user session
 132          * key from the auth subsystem */
 133         session_info->session_key = server_info->user_session_key;
 134
 135         /* Search for each group in the token */
 136
 137         /* Expands the account SID - this function takes in
 138          * memberOf-like values, so we fake one up with the
 139          * <SID=S-...> format of DN and then let it expand
 140          * them, as long as they meet the filter - so only
 141          * builtin groups
 142          *
 143          * We already have the primary group in the token, so set
 144          * 'only childs' flag to true
 145          */
 146         account_sid_string = dom_sid_string(tmp_ctx, server_info->account_sid);
 147         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(account_sid_string, server_info);
 148
 149         account_sid_dn = talloc_asprintf(tmp_ctx, "<SID=%s>", account_sid_string);
 150         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(account_sid_dn, server_info);
 151
 152         account_sid_blob = data_blob_string_const(account_sid_dn);
 153
 154         nt_status = authsam_expand_nested_groups(auth_context->sam_ctx, &account_sid_blob, true, filter,
 155                                               tmp_ctx, &groupSIDs, &num_groupSIDs);
 156         if (!NT_STATUS_IS_OK(nt_status)) {
 157                 talloc_free(tmp_ctx);
 158                 return nt_status;
 159         }
 160
 161         /* Expands the primary group - this function takes in
 162          * memberOf-like values, so we fake one up with the
 163          * <SID=S-...> format of DN and then let it expand
 164          * them, as long as they meet the filter - so only
 165          * builtin groups
 166          *
 167          * We already have the primary group in the token, so set
 168          * 'only childs' flag to true
 169          */
 170         primary_group_string = dom_sid_string(tmp_ctx, server_info->primary_group_sid);
 171         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(primary_group_string, server_info);
 172
 173         primary_group_dn = talloc_asprintf(tmp_ctx, "<SID=%s>", primary_group_string);
 174         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(primary_group_dn, server_info);
 175
 176         primary_group_blob = data_blob_string_const(primary_group_dn);
 177
 178         nt_status = authsam_expand_nested_groups(auth_context->sam_ctx, &primary_group_blob, true, filter,
 179                                               tmp_ctx, &groupSIDs, &num_groupSIDs);
 180         if (!NT_STATUS_IS_OK(nt_status)) {
 181                 talloc_free(tmp_ctx);
 182                 return nt_status;
 183         }
 184
 185         for (i = 0; i < server_info->n_domain_groups; i++) {
 186                 const char *group_string;
 187                 const char *group_dn;
 188                 DATA_BLOB group_blob;
 189                 group_string = dom_sid_string(tmp_ctx, server_info->domain_groups[i]);
 190                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(group_string, server_info);
 191
 192                 group_dn = talloc_asprintf(tmp_ctx, "<SID=%s>", group_string);
 193                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(group_dn, server_info);
 194
 195                 group_blob = data_blob_string_const(group_dn);
 196
 197                 /* This function takes in memberOf values and expands
 198                  * them, as long as they meet the filter - so only
 199                  * builtin groups */
 200                 nt_status = authsam_expand_nested_groups(auth_context->sam_ctx, &group_blob, true, filter,
 201                                                       tmp_ctx, &groupSIDs, &num_groupSIDs);
 202                 if (!NT_STATUS_IS_OK(nt_status)) {
 203                         talloc_free(tmp_ctx);
 204                         return nt_status;
 205                 }
 206         }
 207
 208         nt_status = security_token_create(session_info,
 209                                           event_ctx,
 210                                           lp_ctx,
 211                                           server_info->account_sid,
 212                                           server_info->primary_group_sid,
 213                                           num_groupSIDs,
 214                                           groupSIDs,
 215                                           session_info_flags,
 216                                           &session_info->security_token);
 217         NT_STATUS_NOT_OK_RETURN_AND_FREE(nt_status, tmp_ctx);
 218
 219         session_info->credentials = NULL;
 220
 221         talloc_steal(mem_ctx, session_info);
 222         *_session_info = session_info;
 223         return NT_STATUS_OK;
 224 }
 225
 226 /**
 227  * prints a struct auth_session_info security token to debug output.
 228  */
 229 void auth_session_info_debug(int dbg_lev,
 230                              const struct auth_session_info *session_info)
 231 {
 232         if (!session_info) {
 233                 DEBUG(dbg_lev, ("Session Info: (NULL)\n"));
 234                 return;
 235         }
 236
 237         security_token_debug(dbg_lev, session_info->security_token);
 238 }
 239