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
   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
  32 struct auth_session_info *anonymous_session(TALLOC_CTX *mem_ctx)
  33 {
  34         NTSTATUS nt_status;
  35         struct auth_session_info *session_info = NULL;
  36         nt_status = auth_anonymous_session_info(mem_ctx, global_loadparm, &session_info);
  37         if (!NT_STATUS_IS_OK(nt_status)) {
  38                 return NULL;
  39         }
  40         return session_info;
  41 }
  42
  43 NTSTATUS auth_anonymous_session_info(TALLOC_CTX *parent_ctx,
  44                                      struct loadparm_context *lp_ctx,
  45                                      struct auth_session_info **_session_info)
  46 {
  47         NTSTATUS nt_status;
  48         struct auth_serversupplied_info *server_info = NULL;
  49         struct auth_session_info *session_info = NULL;
  50         TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
  51
  52         nt_status = auth_anonymous_server_info(mem_ctx,
  53                                                lp_netbios_name(lp_ctx),
  54                                                &server_info);
  55         if (!NT_STATUS_IS_OK(nt_status)) {
  56                 talloc_free(mem_ctx);
  57                 return nt_status;
  58         }
  59
  60         /* references the server_info into the session_info */
  61         nt_status = auth_generate_session_info(parent_ctx, server_info, &session_info);
  62         talloc_free(mem_ctx);
  63
  64         NT_STATUS_NOT_OK_RETURN(nt_status);
  65
  66         session_info->credentials = cli_credentials_init(session_info);
  67         if (!session_info->credentials) {
  68                 return NT_STATUS_NO_MEMORY;
  69         }
  70
  71         cli_credentials_set_conf(session_info->credentials, lp_ctx);
  72         cli_credentials_set_anonymous(session_info->credentials);
  73
  74         *_session_info = session_info;
  75
  76         return NT_STATUS_OK;
  77 }
  78
  79 NTSTATUS auth_anonymous_server_info(TALLOC_CTX *mem_ctx,
  80                                     const char *netbios_name,
  81                                     struct auth_serversupplied_info **_server_info)
  82 {
  83         struct auth_serversupplied_info *server_info;
  84         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
  85         NT_STATUS_HAVE_NO_MEMORY(server_info);
  86
  87         server_info->account_sid = dom_sid_parse_talloc(server_info, SID_NT_ANONYMOUS);
  88         NT_STATUS_HAVE_NO_MEMORY(server_info->account_sid);
  89
  90         /* is this correct? */
  91         server_info->primary_group_sid = dom_sid_parse_talloc(server_info, SID_BUILTIN_GUESTS);
  92         NT_STATUS_HAVE_NO_MEMORY(server_info->primary_group_sid);
  93
  94         server_info->n_domain_groups = 0;
  95         server_info->domain_groups = NULL;
  96
  97         /* annoying, but the Anonymous really does have a session key,
  98            and it is all zeros! */
  99         server_info->user_session_key = data_blob_talloc(server_info, NULL, 16);
 100         NT_STATUS_HAVE_NO_MEMORY(server_info->user_session_key.data);
 101
 102         server_info->lm_session_key = data_blob_talloc(server_info, NULL, 16);
 103         NT_STATUS_HAVE_NO_MEMORY(server_info->lm_session_key.data);
 104
 105         data_blob_clear(&server_info->user_session_key);
 106         data_blob_clear(&server_info->lm_session_key);
 107
 108         server_info->account_name = talloc_strdup(server_info, "ANONYMOUS LOGON");
 109         NT_STATUS_HAVE_NO_MEMORY(server_info->account_name);
 110
 111         server_info->domain_name = talloc_strdup(server_info, "NT AUTHORITY");
 112         NT_STATUS_HAVE_NO_MEMORY(server_info->domain_name);
 113
 114         server_info->full_name = talloc_strdup(server_info, "Anonymous Logon");
 115         NT_STATUS_HAVE_NO_MEMORY(server_info->full_name);
 116
 117         server_info->logon_script = talloc_strdup(server_info, "");
 118         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_script);
 119
 120         server_info->profile_path = talloc_strdup(server_info, "");
 121         NT_STATUS_HAVE_NO_MEMORY(server_info->profile_path);
 122
 123         server_info->home_directory = talloc_strdup(server_info, "");
 124         NT_STATUS_HAVE_NO_MEMORY(server_info->home_directory);
 125
 126         server_info->home_drive = talloc_strdup(server_info, "");
 127         NT_STATUS_HAVE_NO_MEMORY(server_info->home_drive);
 128
 129         server_info->logon_server = talloc_strdup(server_info, netbios_name);
 130         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_server);
 131
 132         server_info->last_logon = 0;
 133         server_info->last_logoff = 0;
 134         server_info->acct_expiry = 0;
 135         server_info->last_password_change = 0;
 136         server_info->allow_password_change = 0;
 137         server_info->force_password_change = 0;
 138
 139         server_info->logon_count = 0;
 140         server_info->bad_password_count = 0;
 141
 142         server_info->acct_flags = ACB_NORMAL;
 143
 144         server_info->authenticated = false;
 145
 146         *_server_info = server_info;
 147
 148         return NT_STATUS_OK;
 149 }
 150
 151 NTSTATUS auth_generate_session_info(TALLOC_CTX *mem_ctx,
 152                                     struct auth_serversupplied_info *server_info,
 153                                     struct auth_session_info **_session_info)
 154 {
 155         struct auth_session_info *session_info;
 156         NTSTATUS nt_status;
 157
 158         session_info = talloc(mem_ctx, struct auth_session_info);
 159         NT_STATUS_HAVE_NO_MEMORY(session_info);
 160
 161         session_info->server_info = talloc_reference(session_info, server_info);
 162
 163         /* unless set otherwise, the session key is the user session
 164          * key from the auth subsystem */
 165         session_info->session_key = server_info->user_session_key;
 166
 167         nt_status = security_token_create(session_info,
 168                                           global_loadparm,
 169                                           server_info->account_sid,
 170                                           server_info->primary_group_sid,
 171                                           server_info->n_domain_groups,
 172                                           server_info->domain_groups,
 173                                           server_info->authenticated,
 174                                           &session_info->security_token);
 175         NT_STATUS_NOT_OK_RETURN(nt_status);
 176
 177         session_info->credentials = NULL;
 178
 179         *_session_info = session_info;
 180         return NT_STATUS_OK;
 181 }
 182
 183 /**
 184  * prints a struct auth_session_info security token to debug output.
 185  */
 186 void auth_session_info_debug(int dbg_lev,
 187                              const struct auth_session_info *session_info)
 188 {
 189         if (!session_info) {
 190                 DEBUG(dbg_lev, ("Session Info: (NULL)\n"));
 191                 return;
 192         }
 193
 194         security_token_debug(dbg_lev, session_info->security_token);
 195 }
 196
 197 /**
 198  * Make a server_info struct from the info3 returned by a domain logon
 199  */
 200 NTSTATUS make_server_info_netlogon_validation(TALLOC_CTX *mem_ctx,
 201                                               const char *account_name,
 202                                               uint16_t validation_level,
 203                                               union netr_Validation *validation,
 204                                               struct auth_serversupplied_info **_server_info)
 205 {
 206         struct auth_serversupplied_info *server_info;
 207         struct netr_SamBaseInfo *base = NULL;
 208         int i;
 209
 210         switch (validation_level) {
 211         case 2:
 212                 if (!validation || !validation->sam2) {
 213                         return NT_STATUS_INVALID_PARAMETER;
 214                 }
 215                 base = &validation->sam2->base;
 216                 break;
 217         case 3:
 218                 if (!validation || !validation->sam3) {
 219                         return NT_STATUS_INVALID_PARAMETER;
 220                 }
 221                 base = &validation->sam3->base;
 222                 break;
 223         case 6:
 224                 if (!validation || !validation->sam6) {
 225                         return NT_STATUS_INVALID_PARAMETER;
 226                 }
 227                 base = &validation->sam6->base;
 228                 break;
 229         default:
 230                 return NT_STATUS_INVALID_LEVEL;
 231         }
 232
 233         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 234         NT_STATUS_HAVE_NO_MEMORY(server_info);
 235
 236         /*
 237            Here is where we should check the list of
 238            trusted domains, and verify that the SID
 239            matches.
 240         */
 241         server_info->account_sid = dom_sid_add_rid(server_info, base->domain_sid, base->rid);
 242         NT_STATUS_HAVE_NO_MEMORY(server_info->account_sid);
 243
 244
 245         server_info->primary_group_sid = dom_sid_add_rid(server_info, base->domain_sid, base->primary_gid);
 246         NT_STATUS_HAVE_NO_MEMORY(server_info->primary_group_sid);
 247
 248         server_info->n_domain_groups = base->groups.count;
 249         if (base->groups.count) {
 250                 server_info->domain_groups = talloc_array(server_info, struct dom_sid*, base->groups.count);
 251                 NT_STATUS_HAVE_NO_MEMORY(server_info->domain_groups);
 252         } else {
 253                 server_info->domain_groups = NULL;
 254         }
 255
 256         for (i = 0; i < base->groups.count; i++) {
 257                 server_info->domain_groups[i] = dom_sid_add_rid(server_info, base->domain_sid, base->groups.rids[i].rid);
 258                 NT_STATUS_HAVE_NO_MEMORY(server_info->domain_groups[i]);
 259         }
 260
 261         /* Copy 'other' sids.  We need to do sid filtering here to
 262            prevent possible elevation of privileges.  See:
 263
 264            http://www.microsoft.com/windows2000/techinfo/administration/security/sidfilter.asp
 265          */
 266
 267         if (validation_level == 3) {
 268                 struct dom_sid **dgrps = server_info->domain_groups;
 269                 size_t sidcount = server_info->n_domain_groups + validation->sam3->sidcount;
 270                 size_t n_dgrps = server_info->n_domain_groups;
 271
 272                 if (validation->sam3->sidcount > 0) {
 273                         dgrps = talloc_realloc(server_info, dgrps, struct dom_sid*, sidcount);
 274                         NT_STATUS_HAVE_NO_MEMORY(dgrps);
 275
 276                         for (i = 0; i < validation->sam3->sidcount; i++) {
 277                                 dgrps[n_dgrps + i] = talloc_reference(dgrps, validation->sam3->sids[i].sid);
 278                         }
 279                 }
 280
 281                 server_info->n_domain_groups = sidcount;
 282                 server_info->domain_groups = dgrps;
 283
 284                 /* Where are the 'global' sids?... */
 285         }
 286
 287         if (base->account_name.string) {
 288                 server_info->account_name = talloc_reference(server_info, base->account_name.string);
 289         } else {
 290                 server_info->account_name = talloc_strdup(server_info, account_name);
 291                 NT_STATUS_HAVE_NO_MEMORY(server_info->account_name);
 292         }
 293
 294         server_info->domain_name = talloc_reference(server_info, base->domain.string);
 295         server_info->full_name = talloc_reference(server_info, base->full_name.string);
 296         server_info->logon_script = talloc_reference(server_info, base->logon_script.string);
 297         server_info->profile_path = talloc_reference(server_info, base->profile_path.string);
 298         server_info->home_directory = talloc_reference(server_info, base->home_directory.string);
 299         server_info->home_drive = talloc_reference(server_info, base->home_drive.string);
 300         server_info->logon_server = talloc_reference(server_info, base->logon_server.string);
 301         server_info->last_logon = base->last_logon;
 302         server_info->last_logoff = base->last_logoff;
 303         server_info->acct_expiry = base->acct_expiry;
 304         server_info->last_password_change = base->last_password_change;
 305         server_info->allow_password_change = base->allow_password_change;
 306         server_info->force_password_change = base->force_password_change;
 307         server_info->logon_count = base->logon_count;
 308         server_info->bad_password_count = base->bad_password_count;
 309         server_info->acct_flags = base->acct_flags;
 310
 311         server_info->authenticated = true;
 312
 313         /* ensure we are never given NULL session keys */
 314
 315         if (all_zero(base->key.key, sizeof(base->key.key))) {
 316                 server_info->user_session_key = data_blob(NULL, 0);
 317         } else {
 318                 server_info->user_session_key = data_blob_talloc(server_info, base->key.key, sizeof(base->key.key));
 319                 NT_STATUS_HAVE_NO_MEMORY(server_info->user_session_key.data);
 320         }
 321
 322         if (all_zero(base->LMSessKey.key, sizeof(base->LMSessKey.key))) {
 323                 server_info->lm_session_key = data_blob(NULL, 0);
 324         } else {
 325                 server_info->lm_session_key = data_blob_talloc(server_info, base->LMSessKey.key, sizeof(base->LMSessKey.key));
 326                 NT_STATUS_HAVE_NO_MEMORY(server_info->lm_session_key.data);
 327         }
 328
 329         *_server_info = server_info;
 330         return NT_STATUS_OK;
 331 }
 332
 333