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