source4/auth/system_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
   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 "libcli/security/security.h"
  26 #include "libcli/auth/libcli_auth.h"
  27 #include "auth/credentials/credentials.h"
  28 #include "param/param.h"
  29 #include "auth/auth.h" /* for auth_serversupplied_info */
  30 #include "auth/session.h"
  31 #include "auth/system_session_proto.h"
  32
  33 /**
  34  * Create the SID list for this user.
  35  *
  36  * @note Specialised version for system sessions that doesn't use the SAM.
  37  */
  38 static NTSTATUS create_token(TALLOC_CTX *mem_ctx,
  39                                struct dom_sid *user_sid,
  40                                struct dom_sid *group_sid,
  41                                int n_groupSIDs,
  42                                struct dom_sid **groupSIDs,
  43                                bool is_authenticated,
  44                                struct security_token **token)
  45 {
  46         struct security_token *ptoken;
  47         int i;
  48
  49         ptoken = security_token_initialise(mem_ctx);
  50         NT_STATUS_HAVE_NO_MEMORY(ptoken);
  51
  52         ptoken->sids = talloc_array(ptoken, struct dom_sid *, n_groupSIDs + 5);
  53         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids);
  54
  55         ptoken->user_sid = talloc_reference(ptoken, user_sid);
  56         ptoken->group_sid = talloc_reference(ptoken, group_sid);
  57         ptoken->privilege_mask = 0;
  58
  59         ptoken->sids[0] = ptoken->user_sid;
  60         ptoken->sids[1] = ptoken->group_sid;
  61
  62         /*
  63          * Finally add the "standard" SIDs.
  64          * The only difference between guest and "anonymous"
  65          * is the addition of Authenticated_Users.
  66          */
  67         ptoken->sids[2] = dom_sid_parse_talloc(ptoken->sids, SID_WORLD);
  68         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids[2]);
  69         ptoken->sids[3] = dom_sid_parse_talloc(ptoken->sids, SID_NT_NETWORK);
  70         NT_STATUS_HAVE_NO_MEMORY(ptoken->sids[3]);
  71         ptoken->num_sids = 4;
  72
  73         if (is_authenticated) {
  74                 ptoken->sids[4] = dom_sid_parse_talloc(ptoken->sids, SID_NT_AUTHENTICATED_USERS);
  75                 NT_STATUS_HAVE_NO_MEMORY(ptoken->sids[4]);
  76                 ptoken->num_sids++;
  77         }
  78
  79         for (i = 0; i < n_groupSIDs; i++) {
  80                 size_t check_sid_idx;
  81                 for (check_sid_idx = 1;
  82                      check_sid_idx < ptoken->num_sids;
  83                      check_sid_idx++) {
  84                         if (dom_sid_equal(ptoken->sids[check_sid_idx], groupSIDs[i])) {
  85                                 break;
  86                         }
  87                 }
  88
  89                 if (check_sid_idx == ptoken->num_sids) {
  90                         ptoken->sids[ptoken->num_sids++] = talloc_reference(ptoken->sids, groupSIDs[i]);
  91                 }
  92         }
  93
  94         *token = ptoken;
  95
  96         /* Shortcuts to prevent recursion and avoid lookups */
  97         if (ptoken->user_sid == NULL) {
  98                 ptoken->privilege_mask = 0;
  99                 return NT_STATUS_OK;
 100         }
 101
 102         if (security_token_is_system(ptoken)) {
 103                 ptoken->privilege_mask = ~0;
 104                 return NT_STATUS_OK;
 105         }
 106
 107         if (security_token_is_anonymous(ptoken)) {
 108                 ptoken->privilege_mask = 0;
 109                 return NT_STATUS_OK;
 110         }
 111
 112         DEBUG(0, ("Created token was not system or anonymous token!"));
 113         *token = NULL;
 114         return NT_STATUS_INTERNAL_ERROR;
 115 }
 116
 117 static NTSTATUS generate_session_info(TALLOC_CTX *mem_ctx,
 118                                     struct auth_serversupplied_info *server_info,
 119                                     struct auth_session_info **_session_info)
 120 {
 121         struct auth_session_info *session_info;
 122         NTSTATUS nt_status;
 123
 124         session_info = talloc(mem_ctx, struct auth_session_info);
 125         NT_STATUS_HAVE_NO_MEMORY(session_info);
 126
 127         session_info->server_info = talloc_reference(session_info, server_info);
 128
 129         /* unless set otherwise, the session key is the user session
 130          * key from the auth subsystem */
 131         session_info->session_key = server_info->user_session_key;
 132
 133         nt_status = create_token(session_info,
 134                                           server_info->account_sid,
 135                                           server_info->primary_group_sid,
 136                                           server_info->n_domain_groups,
 137                                           server_info->domain_groups,
 138                                           server_info->authenticated,
 139                                           &session_info->security_token);
 140         NT_STATUS_NOT_OK_RETURN(nt_status);
 141
 142         session_info->credentials = NULL;
 143
 144         *_session_info = session_info;
 145         return NT_STATUS_OK;
 146 }
 147
 148
 149
 150 /* Create a security token for a session SYSTEM (the most
 151  * trusted/prvilaged account), including the local machine account as
 152  * the off-host credentials
 153  */
 154 _PUBLIC_ struct auth_session_info *system_session(TALLOC_CTX *mem_ctx, struct loadparm_context *lp_ctx)
 155 {
 156         NTSTATUS nt_status;
 157         struct auth_session_info *session_info = NULL;
 158         nt_status = auth_system_session_info(mem_ctx,
 159                                              lp_ctx,
 160                                              &session_info);
 161         if (!NT_STATUS_IS_OK(nt_status)) {
 162                 return NULL;
 163         }
 164         return session_info;
 165 }
 166
 167 static NTSTATUS _auth_system_session_info(TALLOC_CTX *parent_ctx,
 168                                           struct loadparm_context *lp_ctx,
 169                                           bool anonymous_credentials,
 170                                           struct auth_session_info **_session_info)
 171 {
 172         NTSTATUS nt_status;
 173         struct auth_serversupplied_info *server_info = NULL;
 174         struct auth_session_info *session_info = NULL;
 175         TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
 176
 177         nt_status = auth_system_server_info(mem_ctx, lp_netbios_name(lp_ctx),
 178                                             &server_info);
 179         if (!NT_STATUS_IS_OK(nt_status)) {
 180                 talloc_free(mem_ctx);
 181                 return nt_status;
 182         }
 183
 184         /* references the server_info into the session_info */
 185         nt_status = generate_session_info(parent_ctx, server_info, &session_info);
 186         talloc_free(mem_ctx);
 187
 188         NT_STATUS_NOT_OK_RETURN(nt_status);
 189
 190         session_info->credentials = cli_credentials_init(session_info);
 191         if (!session_info->credentials) {
 192                 return NT_STATUS_NO_MEMORY;
 193         }
 194
 195         cli_credentials_set_conf(session_info->credentials, lp_ctx);
 196
 197         if (anonymous_credentials) {
 198                 cli_credentials_set_anonymous(session_info->credentials);
 199         } else {
 200                 cli_credentials_set_machine_account_pending(session_info->credentials, lp_ctx);
 201         }
 202         *_session_info = session_info;
 203
 204         return NT_STATUS_OK;
 205 }
 206
 207 /*
 208   Create a system session, but with anonymous credentials (so we do not need to open secrets.ldb)
 209 */
 210 _PUBLIC_ struct auth_session_info *system_session_anon(TALLOC_CTX *mem_ctx, struct loadparm_context *lp_ctx)
 211 {
 212         NTSTATUS nt_status;
 213         struct auth_session_info *session_info = NULL;
 214         nt_status = _auth_system_session_info(mem_ctx, lp_ctx, false, &session_info);
 215         if (!NT_STATUS_IS_OK(nt_status)) {
 216                 return NULL;
 217         }
 218         return session_info;
 219 }
 220
 221
 222
 223 _PUBLIC_ NTSTATUS auth_system_session_info(TALLOC_CTX *parent_ctx,
 224                                            struct loadparm_context *lp_ctx,
 225                                            struct auth_session_info **_session_info)
 226 {
 227         return _auth_system_session_info(parent_ctx,
 228                         lp_ctx,
 229                         lp_parm_bool(lp_ctx, NULL, "system", "anonymous", false),
 230                         _session_info);
 231 }
 232
 233 NTSTATUS auth_system_server_info(TALLOC_CTX *mem_ctx, const char *netbios_name,
 234                                  struct auth_serversupplied_info **_server_info)
 235 {
 236         struct auth_serversupplied_info *server_info;
 237         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 238         NT_STATUS_HAVE_NO_MEMORY(server_info);
 239
 240         server_info->account_sid = dom_sid_parse_talloc(server_info, SID_NT_SYSTEM);
 241         NT_STATUS_HAVE_NO_MEMORY(server_info->account_sid);
 242
 243         /* is this correct? */
 244         server_info->primary_group_sid = dom_sid_parse_talloc(server_info, SID_BUILTIN_ADMINISTRATORS);
 245         NT_STATUS_HAVE_NO_MEMORY(server_info->primary_group_sid);
 246
 247         server_info->n_domain_groups = 0;
 248         server_info->domain_groups = NULL;
 249
 250         /* annoying, but the Anonymous really does have a session key,
 251            and it is all zeros! */
 252         server_info->user_session_key = data_blob_talloc(server_info, NULL, 16);
 253         NT_STATUS_HAVE_NO_MEMORY(server_info->user_session_key.data);
 254
 255         server_info->lm_session_key = data_blob_talloc(server_info, NULL, 16);
 256         NT_STATUS_HAVE_NO_MEMORY(server_info->lm_session_key.data);
 257
 258         data_blob_clear(&server_info->user_session_key);
 259         data_blob_clear(&server_info->lm_session_key);
 260
 261         server_info->account_name = talloc_strdup(server_info, "SYSTEM");
 262         NT_STATUS_HAVE_NO_MEMORY(server_info->account_name);
 263
 264         server_info->domain_name = talloc_strdup(server_info, "NT AUTHORITY");
 265         NT_STATUS_HAVE_NO_MEMORY(server_info->domain_name);
 266
 267         server_info->full_name = talloc_strdup(server_info, "System");
 268         NT_STATUS_HAVE_NO_MEMORY(server_info->full_name);
 269
 270         server_info->logon_script = talloc_strdup(server_info, "");
 271         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_script);
 272
 273         server_info->profile_path = talloc_strdup(server_info, "");
 274         NT_STATUS_HAVE_NO_MEMORY(server_info->profile_path);
 275
 276         server_info->home_directory = talloc_strdup(server_info, "");
 277         NT_STATUS_HAVE_NO_MEMORY(server_info->home_directory);
 278
 279         server_info->home_drive = talloc_strdup(server_info, "");
 280         NT_STATUS_HAVE_NO_MEMORY(server_info->home_drive);
 281
 282         server_info->logon_server = talloc_strdup(server_info, netbios_name);
 283         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_server);
 284
 285         server_info->last_logon = 0;
 286         server_info->last_logoff = 0;
 287         server_info->acct_expiry = 0;
 288         server_info->last_password_change = 0;
 289         server_info->allow_password_change = 0;
 290         server_info->force_password_change = 0;
 291
 292         server_info->logon_count = 0;
 293         server_info->bad_password_count = 0;
 294
 295         server_info->acct_flags = ACB_NORMAL;
 296
 297         server_info->authenticated = true;
 298
 299         *_server_info = server_info;
 300
 301         return NT_STATUS_OK;
 302 }
 303
 304