source/auth/auth_util.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
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25 #include "librpc/gen_ndr/ndr_samr.h"
  26 #include "librpc/gen_ndr/ndr_netlogon.h"
  27 #include "libcli/security/security.h"
  28 #include "auth/auth.h"
  29
  30 #undef DBGC_CLASS
  31 #define DBGC_CLASS DBGC_AUTH
  32
  33 /****************************************************************************
  34  Create an auth_usersupplied_data structure
  35 ****************************************************************************/
  36 static NTSTATUS make_user_info(TALLOC_CTX *mem_ctx,
  37                                struct auth_usersupplied_info **user_info,
  38                                const char *smb_name,
  39                                const char *internal_username,
  40                                const char *client_domain,
  41                                const char *domain,
  42                                const char *wksta_name,
  43                                DATA_BLOB *lm_password, DATA_BLOB *nt_password,
  44                                DATA_BLOB *lm_interactive_password, DATA_BLOB *nt_interactive_password,
  45                                DATA_BLOB *plaintext,
  46                                BOOL encrypted)
  47 {
  48
  49         DEBUG(5,("attempting to make a user_info for %s (%s)\n", internal_username, smb_name));
  50
  51         *user_info = talloc_p(mem_ctx, struct auth_usersupplied_info);
  52         if (!user_info) {
  53                 return NT_STATUS_NO_MEMORY;
  54         }
  55
  56         ZERO_STRUCTP(*user_info);
  57
  58         DEBUG(5,("making strings for %s's user_info struct\n", internal_username));
  59
  60         (*user_info)->smb_name.str = talloc_strdup(*user_info, smb_name);
  61         if ((*user_info)->smb_name.str) {
  62                 (*user_info)->smb_name.len = strlen(smb_name);
  63         } else {
  64                 free_user_info(user_info);
  65                 return NT_STATUS_NO_MEMORY;
  66         }
  67
  68         (*user_info)->internal_username.str = talloc_strdup(*user_info, internal_username);
  69         if ((*user_info)->internal_username.str) {
  70                 (*user_info)->internal_username.len = strlen(internal_username);
  71         } else {
  72                 free_user_info(user_info);
  73                 return NT_STATUS_NO_MEMORY;
  74         }
  75
  76         (*user_info)->domain.str = talloc_strdup(*user_info, domain);
  77         if ((*user_info)->domain.str) {
  78                 (*user_info)->domain.len = strlen(domain);
  79         } else {
  80                 free_user_info(user_info);
  81                 return NT_STATUS_NO_MEMORY;
  82         }
  83
  84         (*user_info)->client_domain.str = talloc_strdup(*user_info, client_domain);
  85         if ((*user_info)->client_domain.str) {
  86                 (*user_info)->client_domain.len = strlen(client_domain);
  87         } else {
  88                 free_user_info(user_info);
  89                 return NT_STATUS_NO_MEMORY;
  90         }
  91
  92         (*user_info)->wksta_name.str = talloc_strdup(*user_info, wksta_name);
  93         if ((*user_info)->wksta_name.str) {
  94                 (*user_info)->wksta_name.len = strlen(wksta_name);
  95         } else {
  96                 free_user_info(user_info);
  97                 return NT_STATUS_NO_MEMORY;
  98         }
  99
 100         DEBUG(5,("making blobs for %s's user_info struct\n", internal_username));
 101
 102         if (lm_password)
 103                 (*user_info)->lm_resp = data_blob_talloc(*user_info,
 104                                                          lm_password->data,
 105                                                          lm_password->length);
 106         if (nt_password)
 107                 (*user_info)->nt_resp = data_blob_talloc(*user_info,
 108                                                          nt_password->data,
 109                                                          nt_password->length);
 110         if (lm_interactive_password)
 111                 (*user_info)->lm_interactive_password =
 112                         data_blob_talloc(*user_info,
 113                                          lm_interactive_password->data,
 114                                          lm_interactive_password->length);
 115         if (nt_interactive_password)
 116                 (*user_info)->nt_interactive_password =
 117                         data_blob_talloc(*user_info,
 118                                          nt_interactive_password->data,
 119                                          nt_interactive_password->length);
 120
 121         if (plaintext)
 122                 (*user_info)->plaintext_password =
 123                         data_blob_talloc(*user_info,
 124                                          plaintext->data,
 125                                          plaintext->length);
 126
 127         (*user_info)->encrypted = encrypted;
 128
 129         DEBUG(10,("made an %sencrypted user_info for %s (%s)\n", encrypted ? "":"un" , internal_username, smb_name));
 130
 131         return NT_STATUS_OK;
 132 }
 133
 134 /****************************************************************************
 135  Create an auth_usersupplied_data structure after appropriate mapping.
 136 ****************************************************************************/
 137
 138 NTSTATUS make_user_info_map(TALLOC_CTX *mem_ctx,
 139                             struct auth_usersupplied_info **user_info,
 140                             const char *smb_name,
 141                             const char *client_domain,
 142                             const char *wksta_name,
 143                             DATA_BLOB *lm_password, DATA_BLOB *nt_password,
 144                             DATA_BLOB *lm_interactive_password, DATA_BLOB *nt_interactive_password,
 145                             DATA_BLOB *plaintext,
 146                             BOOL encrypted)
 147 {
 148         const char *domain;
 149
 150         DEBUG(5, ("make_user_info_map: Mapping user [%s]\\[%s] from workstation [%s]\n",
 151               client_domain, smb_name, wksta_name));
 152
 153         /* don't allow "" as a domain, fixes a Win9X bug
 154            where it doens't supply a domain for logon script
 155            'net use' commands.                                 */
 156
 157         if ( *client_domain )
 158                 domain = client_domain;
 159         else
 160                 domain = lp_workgroup();
 161
 162         /* we know that it is a trusted domain (and we are allowing
 163            them) or it is our domain */
 164
 165         return make_user_info(mem_ctx,
 166                               user_info, smb_name, smb_name,
 167                               client_domain, domain, wksta_name,
 168                               lm_password, nt_password,
 169                               lm_interactive_password, nt_interactive_password,
 170                               plaintext, encrypted);
 171 }
 172
 173 /****************************************************************************
 174  Create an auth_usersupplied_data, making the DATA_BLOBs here.
 175  Decrypt and encrypt the passwords.
 176 ****************************************************************************/
 177
 178 NTSTATUS make_user_info_netlogon_network(TALLOC_CTX *mem_ctx,
 179                                          struct auth_usersupplied_info **user_info,
 180                                          const char *smb_name,
 181                                          const char *client_domain,
 182                                          const char *wksta_name,
 183                                          const uint8_t *lm_network_password, int lm_password_len,
 184                                          const uint8_t *nt_network_password, int nt_password_len)
 185 {
 186         NTSTATUS nt_status;
 187         DATA_BLOB lm_blob = data_blob(lm_network_password, lm_password_len);
 188         DATA_BLOB nt_blob = data_blob(nt_network_password, nt_password_len);
 189
 190         nt_status = make_user_info_map(mem_ctx,
 191                                        user_info,
 192                                        smb_name, client_domain,
 193                                        wksta_name,
 194                                        lm_password_len ? &lm_blob : NULL,
 195                                        nt_password_len ? &nt_blob : NULL,
 196                                        NULL, NULL, NULL,
 197                                        True);
 198
 199         data_blob_free(&lm_blob);
 200         data_blob_free(&nt_blob);
 201         return nt_status;
 202 }
 203
 204 /****************************************************************************
 205  Create an auth_usersupplied_data, making the DATA_BLOBs here.
 206  Decrypt and encrypt the passwords.
 207 ****************************************************************************/
 208
 209 NTSTATUS make_user_info_netlogon_interactive(TALLOC_CTX *mem_ctx,
 210                                              struct auth_usersupplied_info **user_info,
 211                                              const char *smb_name,
 212                                              const char *client_domain,
 213                                              const char *wksta_name,
 214                                              const uint8_t chal[8],
 215                                              const struct samr_Password *lm_interactive_password,
 216                                              const struct samr_Password *nt_interactive_password)
 217 {
 218         NTSTATUS nt_status;
 219         DATA_BLOB local_lm_blob;
 220         DATA_BLOB local_nt_blob;
 221
 222         DATA_BLOB lm_interactive_blob;
 223         DATA_BLOB nt_interactive_blob;
 224         uint8_t local_lm_response[24];
 225         uint8_t local_nt_response[24];
 226
 227         SMBOWFencrypt(lm_interactive_password->hash, chal, local_lm_response);
 228         SMBOWFencrypt(nt_interactive_password->hash, chal, local_nt_response);
 229
 230         local_lm_blob = data_blob(local_lm_response,
 231                                   sizeof(local_lm_response));
 232         lm_interactive_blob = data_blob(lm_interactive_password->hash,
 233                                         sizeof(lm_interactive_password->hash));
 234
 235         local_nt_blob = data_blob(local_nt_response,
 236                                   sizeof(local_nt_response));
 237         nt_interactive_blob = data_blob(nt_interactive_password->hash,
 238                                         sizeof(nt_interactive_password->hash));
 239
 240         nt_status = make_user_info_map(mem_ctx,
 241                                        user_info,
 242                                        smb_name, client_domain,
 243                                        wksta_name,
 244                                        &local_lm_blob,
 245                                        &local_nt_blob,
 246                                        &lm_interactive_blob,
 247                                        &nt_interactive_blob,
 248                                        NULL,
 249                                        True);
 250
 251         data_blob_free(&local_lm_blob);
 252         data_blob_free(&local_nt_blob);
 253         data_blob_free(&lm_interactive_blob);
 254         data_blob_free(&nt_interactive_blob);
 255         return nt_status;
 256 }
 257 /****************************************************************************
 258  Create an auth_usersupplied_data structure
 259 ****************************************************************************/
 260
 261 NTSTATUS make_user_info_for_reply_enc(TALLOC_CTX *mem_ctx,
 262                                       struct auth_usersupplied_info **user_info,
 263                                       const char *smb_name,
 264                                       const char *client_domain,
 265                                       const char *remote_machine,
 266                                       DATA_BLOB lm_resp, DATA_BLOB nt_resp)
 267 {
 268         return make_user_info_map(mem_ctx,
 269                                   user_info, smb_name,
 270                                   client_domain,
 271                                   remote_machine,
 272                                   lm_resp.data ? &lm_resp : NULL,
 273                                   nt_resp.data ? &nt_resp : NULL,
 274                                   NULL, NULL, NULL,
 275                                   True);
 276 }
 277
 278 /****************************************************************************
 279  Create a guest user_info blob, for anonymous authenticaion.
 280 ****************************************************************************/
 281
 282 BOOL make_user_info_guest(TALLOC_CTX *mem_ctx,
 283                           struct auth_usersupplied_info **user_info)
 284 {
 285         NTSTATUS nt_status;
 286
 287         nt_status = make_user_info(mem_ctx,
 288                                    user_info,
 289                                    "","",
 290                                    "","",
 291                                    "",
 292                                    NULL, NULL,
 293                                    NULL, NULL,
 294                                    NULL,
 295                                    True);
 296
 297         return NT_STATUS_IS_OK(nt_status) ? True : False;
 298 }
 299
 300
 301
 302 /***************************************************************************
 303  Make a user_info struct
 304 ***************************************************************************/
 305
 306 NTSTATUS make_server_info(const TALLOC_CTX *mem_ctx,
 307                           struct auth_serversupplied_info **server_info,
 308                           const char *username)
 309 {
 310         *server_info = talloc_p(mem_ctx, struct auth_serversupplied_info);
 311         if (!*server_info) {
 312                 return NT_STATUS_NO_MEMORY;
 313         }
 314         ZERO_STRUCTP(*server_info);
 315
 316         return NT_STATUS_OK;
 317 }
 318
 319 /***************************************************************************
 320  Make a server_info struct from the info3 returned by a domain logon
 321 ***************************************************************************/
 322
 323 NTSTATUS make_server_info_netlogon_validation(TALLOC_CTX *mem_ctx,
 324                                               const char *internal_username,
 325                                               struct auth_serversupplied_info **server_info,
 326                                               uint16 validation_level,
 327                                               union netr_Validation *validation)
 328 {
 329         NTSTATUS nt_status;
 330         struct netr_SamBaseInfo *base = NULL;
 331         switch (validation_level) {
 332         case 2:
 333                 if (!validation || !validation->sam2) {
 334                         return NT_STATUS_INVALID_PARAMETER;
 335                 }
 336                 base = &validation->sam2->base;
 337                 break;
 338         case 3:
 339                 if (!validation || !validation->sam3) {
 340                         return NT_STATUS_INVALID_PARAMETER;
 341                 }
 342                 base = &validation->sam3->base;
 343                 break;
 344         case 6:
 345                 if (!validation || !validation->sam6) {
 346                         return NT_STATUS_INVALID_PARAMETER;
 347                 }
 348                 base = &validation->sam6->base;
 349                 break;
 350         default:
 351                 return NT_STATUS_INVALID_LEVEL;
 352         }
 353
 354         nt_status = make_server_info(mem_ctx, server_info, internal_username);
 355
 356         if (!NT_STATUS_IS_OK(nt_status)) {
 357                 return nt_status;
 358         }
 359
 360         (*server_info)->guest = False;
 361
 362         /*
 363            Here is where we should check the list of
 364            trusted domains, and verify that the SID
 365            matches.
 366         */
 367
 368         (*server_info)->user_sid = dom_sid_add_rid(*server_info, dom_sid_dup(*server_info, base->domain_sid), base->rid);
 369         (*server_info)->primary_group_sid = dom_sid_add_rid(*server_info, dom_sid_dup(*server_info, base->domain_sid), base->primary_gid);
 370
 371         (*server_info)->domain_groups = talloc_array_p((*server_info), struct dom_sid*, base->group_count);
 372         if (!(*server_info)->domain_groups) {
 373                 return NT_STATUS_NO_MEMORY;
 374         }
 375
 376         for ((*server_info)->n_domain_groups = 0;
 377              (*server_info)->n_domain_groups < base->group_count;
 378              (*server_info)->n_domain_groups++) {
 379                 struct dom_sid *sid;
 380                 sid = dom_sid_dup((*server_info)->domain_groups, base->domain_sid);
 381                 if (!sid) {
 382                         return NT_STATUS_NO_MEMORY;
 383                 }
 384                 (*server_info)->domain_groups[(*server_info)->n_domain_groups]
 385                         = dom_sid_add_rid(*server_info, sid,
 386                                           base->groupids[(*server_info)->n_domain_groups].rid);
 387                 if (!(*server_info)->domain_groups[(*server_info)->n_domain_groups]) {
 388                         return NT_STATUS_NO_MEMORY;
 389                 }
 390         }
 391
 392         /* Copy 'other' sids.  We need to do sid filtering here to
 393            prevent possible elevation of privileges.  See:
 394
 395            http://www.microsoft.com/windows2000/techinfo/administration/security/sidfilter.asp
 396          */
 397
 398         if (validation_level == 3) {
 399                 int i;
 400                 (*server_info)->domain_groups
 401                         = talloc_realloc_p((*server_info),
 402                                            (*server_info)->domain_groups,
 403                                            struct dom_sid*,
 404                                            base->group_count + validation->sam3->sidcount);
 405
 406                 if (!(*server_info)->domain_groups) {
 407                         return NT_STATUS_NO_MEMORY;
 408                 }
 409
 410                 for (i = 0; i < validation->sam3->sidcount; i++) {
 411                         (*server_info)->domain_groups[(*server_info)->n_domain_groups + i] =
 412                                 dom_sid_dup((*server_info)->domain_groups,
 413                                             validation->sam3->sids[i].sid);
 414                 }
 415
 416                 /* Where are the 'global' sids?... */
 417         }
 418
 419         if (base->account_name.string) {
 420                 (*server_info)->account_name = talloc_reference(*server_info, base->account_name.string);
 421         } else {
 422                 (*server_info)->account_name = talloc_strdup(*server_info, internal_username);
 423         }
 424
 425         (*server_info)->domain = talloc_reference(*server_info, base->domain.string);
 426         (*server_info)->full_name = talloc_reference(*server_info, base->full_name.string);
 427         (*server_info)->logon_script = talloc_reference(*server_info, base->logon_script.string);
 428         (*server_info)->profile_path = talloc_reference(*server_info, base->profile_path.string);
 429         (*server_info)->home_directory = talloc_reference(*server_info, base->home_directory.string);
 430         (*server_info)->home_drive = talloc_reference(*server_info, base->home_drive.string);
 431         (*server_info)->last_logon = base->last_logon;
 432         (*server_info)->last_logoff = base->last_logoff;
 433         (*server_info)->acct_expiry = base->acct_expiry;
 434         (*server_info)->last_password_change = base->last_password_change;
 435         (*server_info)->allow_password_change = base->allow_password_change;
 436         (*server_info)->force_password_change = base->force_password_change;
 437
 438         (*server_info)->logon_count = base->logon_count;
 439         (*server_info)->bad_password_count = base->bad_password_count;
 440
 441         (*server_info)->acct_flags = base->acct_flags;
 442
 443         /* ensure we are never given NULL session keys */
 444
 445         if (all_zero(base->key.key, sizeof(base->key.key))) {
 446                 (*server_info)->user_session_key = data_blob(NULL, 0);
 447         } else {
 448                 (*server_info)->user_session_key = data_blob_talloc((*server_info), base->key.key, sizeof(base->key.key));
 449         }
 450
 451         if (all_zero(base->LMSessKey.key, sizeof(base->LMSessKey.key))) {
 452                 (*server_info)->lm_session_key = data_blob(NULL, 0);
 453         } else {
 454                 (*server_info)->lm_session_key = data_blob_talloc((*server_info), base->LMSessKey.key, sizeof(base->LMSessKey.key));
 455         }
 456         return NT_STATUS_OK;
 457 }
 458
 459 /***************************************************************************
 460  Free a user_info struct
 461 ***************************************************************************/
 462
 463 void free_user_info(struct auth_usersupplied_info **user_info)
 464 {
 465         DEBUG(5,("attempting to free (and zero) a user_info structure\n"));
 466         if (*user_info) {
 467                 data_blob_clear(&(*user_info)->plaintext_password);
 468         }
 469
 470         talloc_free(*user_info);
 471         *user_info = NULL;
 472 }
 473
 474 /***************************************************************************
 475  Clear out a server_info struct that has been allocated
 476 ***************************************************************************/
 477
 478 void free_server_info(struct auth_serversupplied_info **server_info)
 479 {
 480         DEBUG(5,("attempting to free a server_info structure\n"));
 481         talloc_free(*server_info);
 482         *server_info = NULL;
 483 }
 484
 485 /***************************************************************************
 486  Make an auth_methods struct
 487 ***************************************************************************/
 488
 489 BOOL make_auth_methods(struct auth_context *auth_context, struct auth_methods **auth_method)
 490 {
 491         if (!auth_context) {
 492                 smb_panic("no auth_context supplied to make_auth_methods()!\n");
 493         }
 494
 495         if (!auth_method) {
 496                 smb_panic("make_auth_methods: pointer to auth_method pointer is NULL!\n");
 497         }
 498
 499         *auth_method = talloc_p(auth_context, struct auth_methods);
 500         if (!*auth_method) {
 501                 return False;
 502         }
 503         ZERO_STRUCTP(*auth_method);
 504
 505         return True;
 506 }
 507
 508 NTSTATUS make_session_info(TALLOC_CTX *mem_ctx,
 509                            struct auth_serversupplied_info *server_info,
 510                            struct auth_session_info **session_info)
 511 {
 512         NTSTATUS nt_status;
 513
 514         *session_info = talloc_p(mem_ctx, struct auth_session_info);
 515         if (!*session_info) {
 516                 return NT_STATUS_NO_MEMORY;
 517         }
 518
 519         (*session_info)->server_info = server_info;
 520         talloc_reference(*session_info, (*session_info)->server_info);
 521
 522         /* unless set otherwise, the session key is the user session
 523          * key from the auth subsystem */
 524
 525         (*session_info)->session_key = server_info->user_session_key;
 526
 527         /* we should search for local groups here */
 528
 529         nt_status = security_token_create((*session_info),
 530                                           server_info->user_sid,
 531                                           server_info->primary_group_sid,
 532                                           server_info->n_domain_groups,
 533                                           server_info->domain_groups,
 534                                           False,
 535                                           &(*session_info)->security_token);
 536
 537         return nt_status;
 538 }
 539
 540 /***************************************************************************
 541  Clear out a server_info struct that has been allocated
 542 ***************************************************************************/
 543
 544 void free_session_info(struct auth_session_info **session_info)
 545 {
 546         DEBUG(5,("attempting to free a session_info structure\n"));
 547         talloc_free((*session_info));
 548         *session_info = NULL;
 549 }
 550
 551 /****************************************************************************
 552  prints a struct auth_session_info security token to debug output.
 553 ****************************************************************************/
 554 void auth_session_info_debug(int dbg_lev,
 555                              const struct auth_session_info *session_info)
 556 {
 557         if (!session_info) {
 558                 DEBUGC(dbg_class, dbg_lev, ("Session Info: (NULL)\n"));
 559                 return;
 560         }
 561
 562         security_token_debug(dbg_lev, session_info->security_token);
 563 }
 564
 565 /**
 566  * Squash an NT_STATUS in line with security requirements.
 567  * In an attempt to avoid giving the whole game away when users
 568  * are authenticating, NT replaces both NT_STATUS_NO_SUCH_USER and
 569  * NT_STATUS_WRONG_PASSWORD with NT_STATUS_LOGON_FAILURE in certain situations
 570  * (session setups in particular).
 571  *
 572  * @param nt_status NTSTATUS input for squashing.
 573  * @return the 'squashed' nt_status
 574  **/
 575
 576 NTSTATUS nt_status_squash(NTSTATUS nt_status)
 577 {
 578         if NT_STATUS_IS_OK(nt_status) {
 579                 return nt_status;
 580         } else if NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER) {
 581                 /* Match WinXP and don't give the game away */
 582                 return NT_STATUS_LOGON_FAILURE;
 583
 584         } else if NT_STATUS_EQUAL(nt_status, NT_STATUS_WRONG_PASSWORD) {
 585                 /* Match WinXP and don't give the game away */
 586                 return NT_STATUS_LOGON_FAILURE;
 587         } else {
 588                 return nt_status;
 589         }
 590 }
 591
 592
 593