source4/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    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 2 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, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 #include "includes.h"
  26 #include "librpc/gen_ndr/ndr_samr.h"
  27 #include "librpc/gen_ndr/ndr_netlogon.h"
  28 #include "libcli/security/security.h"
  29 #include "auth/auth.h"
  30
  31 /* this default function can be used by mostly all backends
  32  * which don't want to set a challlenge
  33  */
  34 NTSTATUS auth_get_challenge_not_implemented(struct auth_method_context *ctx, TALLOC_CTX *mem_ctx, DATA_BLOB *challenge)
  35 {
  36         /* we don't want to set a challenge */
  37         return NT_STATUS_NOT_IMPLEMENTED;
  38 }
  39
  40 /****************************************************************************
  41  Create an auth_usersupplied_data structure
  42 ****************************************************************************/
  43 NTSTATUS make_user_info(TALLOC_CTX *mem_ctx,
  44                                const char *c_account_name,
  45                                const char *account_name,
  46                                const char *c_domain_name,
  47                                const char *domain_name,
  48                                const char *workstation_name,
  49                                const char *remote_host,
  50                                DATA_BLOB *lm_password, DATA_BLOB *nt_password,
  51                                DATA_BLOB *lm_interactive_password, DATA_BLOB *nt_interactive_password,
  52                                DATA_BLOB *plaintext_password, BOOL encrypted, uint32_t flags,
  53                                struct auth_usersupplied_info **_user_info)
  54 {
  55         struct auth_usersupplied_info *user_info;
  56         DATA_BLOB blob;
  57
  58         DEBUG(5,("attempting to make a user_info for %s (%s)\n", account_name, c_account_name));
  59
  60         user_info = talloc(mem_ctx, struct auth_usersupplied_info);
  61         NT_STATUS_HAVE_NO_MEMORY(user_info);
  62
  63         DEBUG(5,("making strings for %s's user_info struct\n", account_name));
  64
  65         user_info->client.account_name = talloc_strdup(user_info, c_account_name);
  66         NT_STATUS_HAVE_NO_MEMORY(user_info->client.account_name);
  67
  68         user_info->account_name = talloc_strdup(user_info, account_name);
  69         NT_STATUS_HAVE_NO_MEMORY(user_info->account_name);
  70
  71         user_info->client.domain_name = talloc_strdup(user_info, c_domain_name);
  72         if (c_domain_name && !user_info->client.domain_name) {
  73                 return NT_STATUS_NO_MEMORY;
  74         }
  75
  76         user_info->domain_name = talloc_strdup(user_info, domain_name);
  77         NT_STATUS_HAVE_NO_MEMORY(user_info->domain_name);
  78
  79         user_info->workstation_name = talloc_strdup(user_info, workstation_name);
  80         NT_STATUS_HAVE_NO_MEMORY(user_info->workstation_name);
  81
  82         user_info->remote_host = talloc_strdup(user_info, remote_host);
  83         NT_STATUS_HAVE_NO_MEMORY(user_info->remote_host);
  84
  85         DEBUG(5,("making blobs for %s's user_info struct\n", account_name));
  86
  87         if (lm_password) {
  88                 blob = data_blob_dup_talloc(user_info, lm_password);
  89                 NT_STATUS_HAVE_NO_MEMORY(blob.data);
  90         } else {
  91                 blob = data_blob(NULL, 0);
  92         }
  93         user_info->lm_resp = blob;
  94
  95         if (nt_password) {
  96                 blob = data_blob_dup_talloc(user_info, nt_password);
  97                 NT_STATUS_HAVE_NO_MEMORY(blob.data);
  98         } else {
  99                 blob = data_blob(NULL, 0);
 100         }
 101         user_info->nt_resp = blob;
 102
 103         if (lm_interactive_password) {
 104                 blob = data_blob_dup_talloc(user_info, lm_interactive_password);
 105                 NT_STATUS_HAVE_NO_MEMORY(blob.data);
 106         } else {
 107                 blob = data_blob(NULL, 0);
 108         }
 109         user_info->lm_interactive_password = blob;
 110
 111         if (nt_interactive_password) {
 112                 blob = data_blob_dup_talloc(user_info, nt_interactive_password);
 113                 NT_STATUS_HAVE_NO_MEMORY(blob.data);
 114         } else {
 115                 blob = data_blob(NULL, 0);
 116         }
 117         user_info->nt_interactive_password = blob;
 118
 119         if (plaintext_password) {
 120                 blob = data_blob_dup_talloc(user_info, plaintext_password);
 121                 NT_STATUS_HAVE_NO_MEMORY(blob.data);
 122         } else {
 123                 blob = data_blob(NULL, 0);
 124         }
 125         user_info->plaintext_password = blob;
 126
 127         user_info->encrypted = encrypted;
 128
 129         DEBUG(10,("made an %sencrypted user_info for %s (%s)\n", encrypted ? "":"un" , account_name, c_account_name));
 130
 131         *_user_info = user_info;
 132
 133         return NT_STATUS_OK;
 134 }
 135
 136 /****************************************************************************
 137  Create an auth_usersupplied_data structure after appropriate mapping.
 138 ****************************************************************************/
 139
 140 NTSTATUS make_user_info_map(TALLOC_CTX *mem_ctx,
 141                             const char *c_account_name,
 142                             const char *c_domain_name,
 143                             const char *workstation_name,
 144                             DATA_BLOB *lm_password, DATA_BLOB *nt_password,
 145                             DATA_BLOB *lm_interactive_password, DATA_BLOB *nt_interactive_password,
 146                             DATA_BLOB *plaintext, BOOL encrypted,
 147                             struct auth_usersupplied_info **user_info)
 148 {
 149         const char *domain;
 150         const char *account_name;
 151         char *d;
 152         DEBUG(5,("make_user_info_map: Mapping user [%s]\\[%s] from workstation [%s]\n",
 153                 c_domain_name, c_account_name, workstation_name));
 154
 155         account_name = c_account_name;
 156
 157         /* don't allow "" as a domain, fixes a Win9X bug
 158            where it doens't supply a domain for logon script
 159            'net use' commands.                                 */
 160
 161         /* Split user@realm names into user and realm components.  This is TODO to fix with proper userprincipalname support */
 162         if (c_domain_name && *c_domain_name) {
 163                 domain = c_domain_name;
 164         } else if (strchr_m(c_account_name, '@')) {
 165                 account_name = talloc_strdup(mem_ctx, c_account_name);
 166                 if (!account_name) {
 167                         return NT_STATUS_NO_MEMORY;
 168                 }
 169                 d = strchr_m(account_name, '@');
 170                 if (!d) {
 171                         return NT_STATUS_INTERNAL_ERROR;
 172                 }
 173                 d[0] = '\0';
 174                 d++;
 175                 domain = d;
 176         } else {
 177                 domain = lp_workgroup();
 178         }
 179
 180         return make_user_info(mem_ctx,
 181                               c_account_name, account_name,
 182                               c_domain_name, domain,
 183                               workstation_name,
 184                               workstation_name,
 185                               lm_password, nt_password,
 186                               lm_interactive_password, nt_interactive_password,
 187                               plaintext, encrypted, 0x00,
 188                               user_info);
 189 }
 190
 191 /****************************************************************************
 192  Create an auth_usersupplied_data, making the DATA_BLOBs here.
 193  Decrypt and encrypt the passwords.
 194 ****************************************************************************/
 195 NTSTATUS make_user_info_netlogon_network(TALLOC_CTX *mem_ctx,
 196                                          const char *c_account_name,
 197                                          const char *c_domain_name,
 198                                          const char *workstation_name,
 199                                          const uint8_t *lm_network_password, int lm_password_len,
 200                                          const uint8_t *nt_network_password, int nt_password_len,
 201                                          struct auth_usersupplied_info **user_info)
 202 {
 203         DATA_BLOB lm_blob = data_blob_const(lm_network_password, lm_password_len);
 204         DATA_BLOB nt_blob = data_blob_const(nt_network_password, nt_password_len);
 205
 206         return make_user_info_map(mem_ctx,
 207                                   c_account_name,
 208                                   c_domain_name,
 209                                   workstation_name,
 210                                   lm_password_len ? &lm_blob : NULL,
 211                                   nt_password_len ? &nt_blob : NULL,
 212                                   NULL, NULL, NULL, True,
 213                                   user_info);
 214 }
 215
 216 /****************************************************************************
 217  Create an auth_usersupplied_data, making the DATA_BLOBs here.
 218  Decrypt and encrypt the passwords.
 219 ****************************************************************************/
 220 NTSTATUS make_user_info_netlogon_interactive(TALLOC_CTX *mem_ctx,
 221                                              const char *c_account_name,
 222                                              const char *c_domain_name,
 223                                              const char *workstation_name,
 224                                              const uint8_t chal[8],
 225                                              const struct samr_Password *lm_interactive_password,
 226                                              const struct samr_Password *nt_interactive_password,
 227                                              struct auth_usersupplied_info **user_info)
 228 {
 229         NTSTATUS nt_status;
 230         DATA_BLOB local_lm_blob;
 231         DATA_BLOB local_nt_blob;
 232
 233         DATA_BLOB lm_interactive_blob;
 234         DATA_BLOB nt_interactive_blob;
 235         uint8_t local_lm_response[24];
 236         uint8_t local_nt_response[24];
 237
 238         SMBOWFencrypt(lm_interactive_password->hash, chal, local_lm_response);
 239         SMBOWFencrypt(nt_interactive_password->hash, chal, local_nt_response);
 240
 241         local_lm_blob = data_blob_const(local_lm_response, sizeof(local_lm_response));
 242         lm_interactive_blob = data_blob_const(lm_interactive_password->hash,
 243                                               sizeof(lm_interactive_password->hash));
 244
 245         local_nt_blob = data_blob_const(local_nt_response, sizeof(local_nt_response));
 246         nt_interactive_blob = data_blob_const(nt_interactive_password->hash,
 247                                               sizeof(nt_interactive_password->hash));
 248
 249         nt_status = make_user_info_map(mem_ctx,
 250                                        c_account_name,
 251                                        c_domain_name,
 252                                        workstation_name,
 253                                        &local_lm_blob,
 254                                        &local_nt_blob,
 255                                        &lm_interactive_blob,
 256                                        &nt_interactive_blob,
 257                                        NULL, True,
 258                                        user_info);
 259         return nt_status;
 260 }
 261
 262 /****************************************************************************
 263  Create an auth_usersupplied_data structure
 264 ****************************************************************************/
 265 NTSTATUS make_user_info_for_reply_enc(TALLOC_CTX *mem_ctx,
 266                                       const char *c_account_name,
 267                                       const char *c_domain_name,
 268                                       const char *workstation_name,
 269                                       DATA_BLOB lm_resp, DATA_BLOB nt_resp,
 270                                       struct auth_usersupplied_info **user_info)
 271 {
 272         return make_user_info_map(mem_ctx,
 273                                   c_account_name,
 274                                   c_domain_name,
 275                                   workstation_name,
 276                                   lm_resp.data ? &lm_resp : NULL,
 277                                   nt_resp.data ? &nt_resp : NULL,
 278                                   NULL, NULL, NULL, True,
 279                                   user_info);
 280 }
 281
 282 /****************************************************************************
 283  Create a anonymous user_info blob, for anonymous authenticaion.
 284 ****************************************************************************/
 285 NTSTATUS make_user_info_anonymous(TALLOC_CTX *mem_ctx, struct auth_usersupplied_info **user_info)
 286 {
 287         return make_user_info(mem_ctx,
 288                               "", "", "", "", "", "",
 289                               NULL, NULL, NULL, NULL,
 290                               NULL, True, 0x00,
 291                               user_info);
 292 }
 293
 294
 295 /***************************************************************************
 296  Make a server_info struct from the info3 returned by a domain logon
 297 ***************************************************************************/
 298 NTSTATUS make_server_info_netlogon_validation(TALLOC_CTX *mem_ctx,
 299                                               const char *account_name,
 300                                               uint16_t validation_level,
 301                                               union netr_Validation *validation,
 302                                               struct auth_serversupplied_info **_server_info)
 303 {
 304         struct auth_serversupplied_info *server_info;
 305         struct netr_SamBaseInfo *base = NULL;
 306         int i;
 307
 308         switch (validation_level) {
 309         case 2:
 310                 if (!validation || !validation->sam2) {
 311                         return NT_STATUS_INVALID_PARAMETER;
 312                 }
 313                 base = &validation->sam2->base;
 314                 break;
 315         case 3:
 316                 if (!validation || !validation->sam3) {
 317                         return NT_STATUS_INVALID_PARAMETER;
 318                 }
 319                 base = &validation->sam3->base;
 320                 break;
 321         case 6:
 322                 if (!validation || !validation->sam6) {
 323                         return NT_STATUS_INVALID_PARAMETER;
 324                 }
 325                 base = &validation->sam6->base;
 326                 break;
 327         default:
 328                 return NT_STATUS_INVALID_LEVEL;
 329         }
 330
 331         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 332         NT_STATUS_HAVE_NO_MEMORY(server_info);
 333
 334         /*
 335            Here is where we should check the list of
 336            trusted domains, and verify that the SID
 337            matches.
 338         */
 339         server_info->account_sid = dom_sid_add_rid(server_info, base->domain_sid, base->rid);
 340         NT_STATUS_HAVE_NO_MEMORY(server_info->account_sid);
 341
 342
 343         server_info->primary_group_sid = dom_sid_add_rid(server_info, base->domain_sid, base->primary_gid);
 344         NT_STATUS_HAVE_NO_MEMORY(server_info->primary_group_sid);
 345
 346         server_info->n_domain_groups = base->groups.count;
 347         if (base->groups.count) {
 348                 server_info->domain_groups = talloc_array(server_info, struct dom_sid*, base->groups.count);
 349                 NT_STATUS_HAVE_NO_MEMORY(server_info->domain_groups);
 350         } else {
 351                 server_info->domain_groups = NULL;
 352         }
 353
 354         for (i = 0; i < base->groups.count; i++) {
 355                 server_info->domain_groups[i] = dom_sid_add_rid(server_info, base->domain_sid, base->groups.rids[i].rid);
 356                 NT_STATUS_HAVE_NO_MEMORY(server_info->domain_groups[i]);
 357         }
 358
 359         /* Copy 'other' sids.  We need to do sid filtering here to
 360            prevent possible elevation of privileges.  See:
 361
 362            http://www.microsoft.com/windows2000/techinfo/administration/security/sidfilter.asp
 363          */
 364
 365         if (validation_level == 3) {
 366                 struct dom_sid **dgrps = server_info->domain_groups;
 367                 size_t sidcount = server_info->n_domain_groups + validation->sam3->sidcount;
 368                 size_t n_dgrps = server_info->n_domain_groups;
 369
 370                 dgrps = talloc_realloc(server_info, dgrps, struct dom_sid*, sidcount);
 371                 NT_STATUS_HAVE_NO_MEMORY(dgrps);
 372
 373                 for (i = 0; i < validation->sam3->sidcount; i++) {
 374                         dgrps[n_dgrps + i] = talloc_reference(dgrps, validation->sam3->sids[i].sid);
 375                 }
 376
 377                 server_info->n_domain_groups = sidcount;
 378                 server_info->domain_groups = dgrps;
 379
 380                 /* Where are the 'global' sids?... */
 381         }
 382
 383         if (base->account_name.string) {
 384                 server_info->account_name = talloc_reference(server_info, base->account_name.string);
 385         } else {
 386                 server_info->account_name = talloc_strdup(server_info, account_name);
 387                 NT_STATUS_HAVE_NO_MEMORY(server_info->account_name);
 388         }
 389
 390         server_info->domain_name = talloc_reference(server_info, base->domain.string);
 391         server_info->full_name = talloc_reference(server_info, base->full_name.string);
 392         server_info->logon_script = talloc_reference(server_info, base->logon_script.string);
 393         server_info->profile_path = talloc_reference(server_info, base->profile_path.string);
 394         server_info->home_directory = talloc_reference(server_info, base->home_directory.string);
 395         server_info->home_drive = talloc_reference(server_info, base->home_drive.string);
 396         server_info->last_logon = base->last_logon;
 397         server_info->last_logoff = base->last_logoff;
 398         server_info->acct_expiry = base->acct_expiry;
 399         server_info->last_password_change = base->last_password_change;
 400         server_info->allow_password_change = base->allow_password_change;
 401         server_info->force_password_change = base->force_password_change;
 402         server_info->logon_count = base->logon_count;
 403         server_info->bad_password_count = base->bad_password_count;
 404         server_info->acct_flags = base->acct_flags;
 405
 406         server_info->authenticated = True;
 407
 408         /* ensure we are never given NULL session keys */
 409
 410         if (all_zero(base->key.key, sizeof(base->key.key))) {
 411                 server_info->user_session_key = data_blob(NULL, 0);
 412         } else {
 413                 server_info->user_session_key = data_blob_talloc(server_info, base->key.key, sizeof(base->key.key));
 414                 NT_STATUS_HAVE_NO_MEMORY(server_info->user_session_key.data);
 415         }
 416
 417         if (all_zero(base->LMSessKey.key, sizeof(base->LMSessKey.key))) {
 418                 server_info->lm_session_key = data_blob(NULL, 0);
 419         } else {
 420                 server_info->lm_session_key = data_blob_talloc(server_info, base->LMSessKey.key, sizeof(base->LMSessKey.key));
 421                 NT_STATUS_HAVE_NO_MEMORY(server_info->lm_session_key.data);
 422         }
 423
 424         *_server_info = server_info;
 425         return NT_STATUS_OK;
 426 }
 427
 428
 429 NTSTATUS auth_anonymous_server_info(TALLOC_CTX *mem_ctx, struct auth_serversupplied_info **_server_info)
 430 {
 431         struct auth_serversupplied_info *server_info;
 432         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 433         NT_STATUS_HAVE_NO_MEMORY(server_info);
 434
 435         server_info->account_sid = dom_sid_parse_talloc(server_info, SID_NT_ANONYMOUS);
 436         NT_STATUS_HAVE_NO_MEMORY(server_info->account_sid);
 437
 438         /* is this correct? */
 439         server_info->primary_group_sid = dom_sid_parse_talloc(server_info, SID_BUILTIN_GUESTS);
 440         NT_STATUS_HAVE_NO_MEMORY(server_info->primary_group_sid);
 441
 442         server_info->n_domain_groups = 0;
 443         server_info->domain_groups = NULL;
 444
 445         /* annoying, but the Anonymous really does have a session key,
 446            and it is all zeros! */
 447         server_info->user_session_key = data_blob_talloc(server_info, NULL, 16);
 448         NT_STATUS_HAVE_NO_MEMORY(server_info->user_session_key.data);
 449
 450         server_info->lm_session_key = data_blob_talloc(server_info, NULL, 16);
 451         NT_STATUS_HAVE_NO_MEMORY(server_info->lm_session_key.data);
 452
 453         data_blob_clear(&server_info->user_session_key);
 454         data_blob_clear(&server_info->lm_session_key);
 455
 456         server_info->account_name = talloc_strdup(server_info, "ANONYMOUS LOGON");
 457         NT_STATUS_HAVE_NO_MEMORY(server_info->account_name);
 458
 459         server_info->domain_name = talloc_strdup(server_info, "NT AUTHORITY");
 460         NT_STATUS_HAVE_NO_MEMORY(server_info->domain_name);
 461
 462         server_info->full_name = talloc_strdup(server_info, "Anonymous Logon");
 463         NT_STATUS_HAVE_NO_MEMORY(server_info->full_name);
 464
 465         server_info->logon_script = talloc_strdup(server_info, "");
 466         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_script);
 467
 468         server_info->profile_path = talloc_strdup(server_info, "");
 469         NT_STATUS_HAVE_NO_MEMORY(server_info->profile_path);
 470
 471         server_info->home_directory = talloc_strdup(server_info, "");
 472         NT_STATUS_HAVE_NO_MEMORY(server_info->home_directory);
 473
 474         server_info->home_drive = talloc_strdup(server_info, "");
 475         NT_STATUS_HAVE_NO_MEMORY(server_info->home_drive);
 476
 477         server_info->last_logon = 0;
 478         server_info->last_logoff = 0;
 479         server_info->acct_expiry = 0;
 480         server_info->last_password_change = 0;
 481         server_info->allow_password_change = 0;
 482         server_info->force_password_change = 0;
 483
 484         server_info->logon_count = 0;
 485         server_info->bad_password_count = 0;
 486
 487         server_info->acct_flags = ACB_NORMAL;
 488
 489         server_info->authenticated = False;
 490
 491         *_server_info = server_info;
 492
 493         return NT_STATUS_OK;
 494 }
 495
 496 NTSTATUS auth_generate_session_info(TALLOC_CTX *mem_ctx,
 497                                     struct auth_serversupplied_info *server_info,
 498                                     struct auth_session_info **_session_info)
 499 {
 500         struct auth_session_info *session_info;
 501         NTSTATUS nt_status;
 502
 503         session_info = talloc(mem_ctx, struct auth_session_info);
 504         NT_STATUS_HAVE_NO_MEMORY(session_info);
 505
 506         session_info->server_info = talloc_reference(session_info, server_info);
 507
 508         /* unless set otherwise, the session key is the user session
 509          * key from the auth subsystem */
 510         session_info->session_key = server_info->user_session_key;
 511
 512         nt_status = security_token_create(session_info,
 513                                           server_info->account_sid,
 514                                           server_info->primary_group_sid,
 515                                           server_info->n_domain_groups,
 516                                           server_info->domain_groups,
 517                                           server_info->authenticated,
 518                                           &session_info->security_token);
 519         NT_STATUS_NOT_OK_RETURN(nt_status);
 520
 521         *_session_info = session_info;
 522         return NT_STATUS_OK;
 523 }
 524
 525 /****************************************************************************
 526  prints a struct auth_session_info security token to debug output.
 527 ****************************************************************************/
 528 void auth_session_info_debug(int dbg_lev,
 529                              const struct auth_session_info *session_info)
 530 {
 531         if (!session_info) {
 532                 DEBUGC(dbg_class, dbg_lev, ("Session Info: (NULL)\n"));
 533                 return;
 534         }
 535
 536         security_token_debug(dbg_lev, session_info->security_token);
 537 }
 538
 539 /**
 540  * Squash an NT_STATUS in line with security requirements.
 541  * In an attempt to avoid giving the whole game away when users
 542  * are authenticating, NT replaces both NT_STATUS_NO_SUCH_USER and
 543  * NT_STATUS_WRONG_PASSWORD with NT_STATUS_LOGON_FAILURE in certain situations
 544  * (session setups in particular).
 545  *
 546  * @param nt_status NTSTATUS input for squashing.
 547  * @return the 'squashed' nt_status
 548  **/
 549 NTSTATUS auth_nt_status_squash(NTSTATUS nt_status)
 550 {
 551         if NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER) {
 552                 /* Match WinXP and don't give the game away */
 553                 return NT_STATUS_LOGON_FAILURE;
 554         } else if NT_STATUS_EQUAL(nt_status, NT_STATUS_WRONG_PASSWORD) {
 555                 /* Match WinXP and don't give the game away */
 556                 return NT_STATUS_LOGON_FAILURE;
 557         }
 558
 559         return nt_status;
 560 }