source3/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 2001-2011
   6    Copyright (C) Jeremy Allison 2000-2001
   7    Copyright (C) Rafal Szczesniak 2002
   8    Copyright (C) Volker Lendecke 2006-2008
   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.h"
  26 #include "../libcli/auth/libcli_auth.h"
  27 #include "../lib/crypto/arcfour.h"
  28 #include "rpc_client/init_lsa.h"
  29 #include "../libcli/security/security.h"
  30 #include "../lib/util/util_pw.h"
  31 #include "lib/winbind_util.h"
  32 #include "passdb.h"
  33 #include "../librpc/gen_ndr/ndr_auth.h"
  34 #include "../auth/auth_sam_reply.h"
  35
  36 #undef DBGC_CLASS
  37 #define DBGC_CLASS DBGC_AUTH
  38
  39 /****************************************************************************
  40  Create a UNIX user on demand.
  41 ****************************************************************************/
  42
  43 static int _smb_create_user(const char *domain, const char *unix_username, const char *homedir)
  44 {
  45         TALLOC_CTX *ctx = talloc_tos();
  46         char *add_script;
  47         int ret;
  48
  49         add_script = talloc_strdup(ctx, lp_adduser_script());
  50         if (!add_script || !*add_script) {
  51                 return -1;
  52         }
  53         add_script = talloc_all_string_sub(ctx,
  54                                 add_script,
  55                                 "%u",
  56                                 unix_username);
  57         if (!add_script) {
  58                 return -1;
  59         }
  60         if (domain) {
  61                 add_script = talloc_all_string_sub(ctx,
  62                                         add_script,
  63                                         "%D",
  64                                         domain);
  65                 if (!add_script) {
  66                         return -1;
  67                 }
  68         }
  69         if (homedir) {
  70                 add_script = talloc_all_string_sub(ctx,
  71                                 add_script,
  72                                 "%H",
  73                                 homedir);
  74                 if (!add_script) {
  75                         return -1;
  76                 }
  77         }
  78         ret = smbrun(add_script,NULL);
  79         flush_pwnam_cache();
  80         DEBUG(ret ? 0 : 3,
  81                 ("smb_create_user: Running the command `%s' gave %d\n",
  82                  add_script,ret));
  83         return ret;
  84 }
  85
  86 /****************************************************************************
  87  Create an auth_usersupplied_data structure after appropriate mapping.
  88 ****************************************************************************/
  89
  90 NTSTATUS make_user_info_map(struct auth_usersupplied_info **user_info,
  91                             const char *smb_name,
  92                             const char *client_domain,
  93                             const char *workstation_name,
  94                             const struct tsocket_address *remote_address,
  95                             DATA_BLOB *lm_pwd,
  96                             DATA_BLOB *nt_pwd,
  97                             const struct samr_Password *lm_interactive_pwd,
  98                             const struct samr_Password *nt_interactive_pwd,
  99                             const char *plaintext,
 100                             enum auth_password_state password_state)
 101 {
 102         const char *domain;
 103         NTSTATUS result;
 104         bool was_mapped;
 105         char *internal_username = NULL;
 106
 107         was_mapped = map_username(talloc_tos(), smb_name, &internal_username);
 108         if (!internal_username) {
 109                 return NT_STATUS_NO_MEMORY;
 110         }
 111
 112         DEBUG(5, ("Mapping user [%s]\\[%s] from workstation [%s]\n",
 113                  client_domain, smb_name, workstation_name));
 114
 115         domain = client_domain;
 116
 117         /* If you connect to a Windows domain member using a bogus domain name,
 118          * the Windows box will map the BOGUS\user to SAMNAME\user.  Thus, if
 119          * the Windows box is a DC the name will become DOMAIN\user and be
 120          * authenticated against AD, if the Windows box is a member server but
 121          * not a DC the name will become WORKSTATION\user.  A standalone
 122          * non-domain member box will also map to WORKSTATION\user.
 123          * This also deals with the client passing in a "" domain */
 124
 125         if (!is_trusted_domain(domain) &&
 126             !strequal(domain, my_sam_name()))
 127         {
 128                 if (lp_map_untrusted_to_domain())
 129                         domain = my_sam_name();
 130                 else
 131                         domain = get_global_sam_name();
 132                 DEBUG(5, ("Mapped domain from [%s] to [%s] for user [%s] from "
 133                           "workstation [%s]\n",
 134                           client_domain, domain, smb_name, workstation_name));
 135         }
 136
 137         /* We know that the given domain is trusted (and we are allowing them),
 138          * it is our global SAM name, or for legacy behavior it is our
 139          * primary domain name */
 140
 141         result = make_user_info(user_info, smb_name, internal_username,
 142                               client_domain, domain, workstation_name,
 143                               remote_address, lm_pwd, nt_pwd,
 144                               lm_interactive_pwd, nt_interactive_pwd,
 145                               plaintext, password_state);
 146         if (NT_STATUS_IS_OK(result)) {
 147                 /* We have tried mapping */
 148                 (*user_info)->mapped_state = true;
 149                 /* did we actually map the user to a different name? */
 150                 (*user_info)->was_mapped = was_mapped;
 151         }
 152         return result;
 153 }
 154
 155 /****************************************************************************
 156  Create an auth_usersupplied_data, making the DATA_BLOBs here.
 157  Decrypt and encrypt the passwords.
 158 ****************************************************************************/
 159
 160 bool make_user_info_netlogon_network(struct auth_usersupplied_info **user_info,
 161                                      const char *smb_name,
 162                                      const char *client_domain,
 163                                      const char *workstation_name,
 164                                      const struct tsocket_address *remote_address,
 165                                      uint32 logon_parameters,
 166                                      const uchar *lm_network_pwd,
 167                                      int lm_pwd_len,
 168                                      const uchar *nt_network_pwd,
 169                                      int nt_pwd_len)
 170 {
 171         bool ret;
 172         NTSTATUS status;
 173         DATA_BLOB lm_blob = data_blob(lm_network_pwd, lm_pwd_len);
 174         DATA_BLOB nt_blob = data_blob(nt_network_pwd, nt_pwd_len);
 175
 176         status = make_user_info_map(user_info,
 177                                     smb_name, client_domain,
 178                                     workstation_name,
 179                                     remote_address,
 180                                     lm_pwd_len ? &lm_blob : NULL,
 181                                     nt_pwd_len ? &nt_blob : NULL,
 182                                     NULL, NULL, NULL,
 183                                     AUTH_PASSWORD_RESPONSE);
 184
 185         if (NT_STATUS_IS_OK(status)) {
 186                 (*user_info)->logon_parameters = logon_parameters;
 187         }
 188         ret = NT_STATUS_IS_OK(status) ? true : false;
 189
 190         data_blob_free(&lm_blob);
 191         data_blob_free(&nt_blob);
 192         return ret;
 193 }
 194
 195 /****************************************************************************
 196  Create an auth_usersupplied_data, making the DATA_BLOBs here.
 197  Decrypt and encrypt the passwords.
 198 ****************************************************************************/
 199
 200 bool make_user_info_netlogon_interactive(struct auth_usersupplied_info **user_info,
 201                                          const char *smb_name,
 202                                          const char *client_domain,
 203                                          const char *workstation_name,
 204                                          const struct tsocket_address *remote_address,
 205                                          uint32 logon_parameters,
 206                                          const uchar chal[8],
 207                                          const uchar lm_interactive_pwd[16],
 208                                          const uchar nt_interactive_pwd[16],
 209                                          const uchar *dc_sess_key)
 210 {
 211         struct samr_Password lm_pwd;
 212         struct samr_Password nt_pwd;
 213         unsigned char local_lm_response[24];
 214         unsigned char local_nt_response[24];
 215         unsigned char key[16];
 216
 217         memcpy(key, dc_sess_key, 16);
 218
 219         if (lm_interactive_pwd)
 220                 memcpy(lm_pwd.hash, lm_interactive_pwd, sizeof(lm_pwd.hash));
 221
 222         if (nt_interactive_pwd)
 223                 memcpy(nt_pwd.hash, nt_interactive_pwd, sizeof(nt_pwd.hash));
 224
 225 #ifdef DEBUG_PASSWORD
 226         DEBUG(100,("key:"));
 227         dump_data(100, key, sizeof(key));
 228
 229         DEBUG(100,("lm owf password:"));
 230         dump_data(100, lm_pwd.hash, sizeof(lm_pwd.hash));
 231
 232         DEBUG(100,("nt owf password:"));
 233         dump_data(100, nt_pwd.hash, sizeof(nt_pwd.hash));
 234 #endif
 235
 236         if (lm_interactive_pwd)
 237                 arcfour_crypt(lm_pwd.hash, key, sizeof(lm_pwd.hash));
 238
 239         if (nt_interactive_pwd)
 240                 arcfour_crypt(nt_pwd.hash, key, sizeof(nt_pwd.hash));
 241
 242 #ifdef DEBUG_PASSWORD
 243         DEBUG(100,("decrypt of lm owf password:"));
 244         dump_data(100, lm_pwd.hash, sizeof(lm_pwd));
 245
 246         DEBUG(100,("decrypt of nt owf password:"));
 247         dump_data(100, nt_pwd.hash, sizeof(nt_pwd));
 248 #endif
 249
 250         if (lm_interactive_pwd)
 251                 SMBOWFencrypt(lm_pwd.hash, chal,
 252                               local_lm_response);
 253
 254         if (nt_interactive_pwd)
 255                 SMBOWFencrypt(nt_pwd.hash, chal,
 256                               local_nt_response);
 257
 258         /* Password info paranoia */
 259         ZERO_STRUCT(key);
 260
 261         {
 262                 bool ret;
 263                 NTSTATUS nt_status;
 264                 DATA_BLOB local_lm_blob;
 265                 DATA_BLOB local_nt_blob;
 266
 267                 if (lm_interactive_pwd) {
 268                         local_lm_blob = data_blob(local_lm_response,
 269                                                   sizeof(local_lm_response));
 270                 }
 271
 272                 if (nt_interactive_pwd) {
 273                         local_nt_blob = data_blob(local_nt_response,
 274                                                   sizeof(local_nt_response));
 275                 }
 276
 277                 nt_status = make_user_info_map(
 278                         user_info,
 279                         smb_name, client_domain, workstation_name,
 280                         remote_address,
 281                         lm_interactive_pwd ? &local_lm_blob : NULL,
 282                         nt_interactive_pwd ? &local_nt_blob : NULL,
 283                         lm_interactive_pwd ? &lm_pwd : NULL,
 284                         nt_interactive_pwd ? &nt_pwd : NULL,
 285                         NULL, AUTH_PASSWORD_HASH);
 286
 287                 if (NT_STATUS_IS_OK(nt_status)) {
 288                         (*user_info)->logon_parameters = logon_parameters;
 289                 }
 290
 291                 ret = NT_STATUS_IS_OK(nt_status) ? true : false;
 292                 data_blob_free(&local_lm_blob);
 293                 data_blob_free(&local_nt_blob);
 294                 return ret;
 295         }
 296 }
 297
 298
 299 /****************************************************************************
 300  Create an auth_usersupplied_data structure
 301 ****************************************************************************/
 302
 303 bool make_user_info_for_reply(struct auth_usersupplied_info **user_info,
 304                               const char *smb_name,
 305                               const char *client_domain,
 306                               const struct tsocket_address *remote_address,
 307                               const uint8 chal[8],
 308                               DATA_BLOB plaintext_password)
 309 {
 310
 311         DATA_BLOB local_lm_blob;
 312         DATA_BLOB local_nt_blob;
 313         NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
 314         char *plaintext_password_string;
 315         /*
 316          * Not encrypted - do so.
 317          */
 318
 319         DEBUG(5,("make_user_info_for_reply: User passwords not in encrypted "
 320                  "format.\n"));
 321         if (plaintext_password.data && plaintext_password.length) {
 322                 unsigned char local_lm_response[24];
 323
 324 #ifdef DEBUG_PASSWORD
 325                 DEBUG(10,("Unencrypted password (len %d):\n",
 326                           (int)plaintext_password.length));
 327                 dump_data(100, plaintext_password.data,
 328                           plaintext_password.length);
 329 #endif
 330
 331                 SMBencrypt( (const char *)plaintext_password.data,
 332                             (const uchar*)chal, local_lm_response);
 333                 local_lm_blob = data_blob(local_lm_response, 24);
 334
 335                 /* We can't do an NT hash here, as the password needs to be
 336                    case insensitive */
 337                 local_nt_blob = data_blob_null;
 338         } else {
 339                 local_lm_blob = data_blob_null;
 340                 local_nt_blob = data_blob_null;
 341         }
 342
 343         plaintext_password_string = talloc_strndup(talloc_tos(),
 344                                                    (const char *)plaintext_password.data,
 345                                                    plaintext_password.length);
 346         if (!plaintext_password_string) {
 347                 return false;
 348         }
 349
 350         ret = make_user_info_map(
 351                 user_info, smb_name, client_domain,
 352                 get_remote_machine_name(),
 353                 remote_address,
 354                 local_lm_blob.data ? &local_lm_blob : NULL,
 355                 local_nt_blob.data ? &local_nt_blob : NULL,
 356                 NULL, NULL,
 357                 plaintext_password_string,
 358                 AUTH_PASSWORD_PLAIN);
 359
 360         if (plaintext_password_string) {
 361                 memset(plaintext_password_string, '\0', strlen(plaintext_password_string));
 362                 talloc_free(plaintext_password_string);
 363         }
 364
 365         data_blob_free(&local_lm_blob);
 366         return NT_STATUS_IS_OK(ret) ? true : false;
 367 }
 368
 369 /****************************************************************************
 370  Create an auth_usersupplied_data structure
 371 ****************************************************************************/
 372
 373 NTSTATUS make_user_info_for_reply_enc(struct auth_usersupplied_info **user_info,
 374                                       const char *smb_name,
 375                                       const char *client_domain,
 376                                       const struct tsocket_address *remote_address,
 377                                       DATA_BLOB lm_resp, DATA_BLOB nt_resp)
 378 {
 379         return make_user_info_map(user_info, smb_name,
 380                                   client_domain,
 381                                   get_remote_machine_name(),
 382                                   remote_address,
 383                                   lm_resp.data && (lm_resp.length > 0) ? &lm_resp : NULL,
 384                                   nt_resp.data && (nt_resp.length > 0) ? &nt_resp : NULL,
 385                                   NULL, NULL, NULL,
 386                                   AUTH_PASSWORD_RESPONSE);
 387 }
 388
 389 /****************************************************************************
 390  Create a guest user_info blob, for anonymous authentication.
 391 ****************************************************************************/
 392
 393 bool make_user_info_guest(const struct tsocket_address *remote_address,
 394                           struct auth_usersupplied_info **user_info)
 395 {
 396         NTSTATUS nt_status;
 397
 398         nt_status = make_user_info(user_info,
 399                                    "","",
 400                                    "","",
 401                                    "",
 402                                    remote_address,
 403                                    NULL, NULL,
 404                                    NULL, NULL,
 405                                    NULL,
 406                                    AUTH_PASSWORD_RESPONSE);
 407
 408         return NT_STATUS_IS_OK(nt_status) ? true : false;
 409 }
 410
 411 static NTSTATUS log_nt_token(struct security_token *token)
 412 {
 413         TALLOC_CTX *frame = talloc_stackframe();
 414         char *command;
 415         char *group_sidstr;
 416         size_t i;
 417
 418         if ((lp_log_nt_token_command() == NULL) ||
 419             (strlen(lp_log_nt_token_command()) == 0)) {
 420                 TALLOC_FREE(frame);
 421                 return NT_STATUS_OK;
 422         }
 423
 424         group_sidstr = talloc_strdup(frame, "");
 425         for (i=1; i<token->num_sids; i++) {
 426                 group_sidstr = talloc_asprintf(
 427                         frame, "%s %s", group_sidstr,
 428                         sid_string_talloc(frame, &token->sids[i]));
 429         }
 430
 431         command = talloc_string_sub(
 432                 frame, lp_log_nt_token_command(),
 433                 "%s", sid_string_talloc(frame, &token->sids[0]));
 434         command = talloc_string_sub(frame, command, "%t", group_sidstr);
 435
 436         if (command == NULL) {
 437                 TALLOC_FREE(frame);
 438                 return NT_STATUS_NO_MEMORY;
 439         }
 440
 441         DEBUG(8, ("running command: [%s]\n", command));
 442         if (smbrun(command, NULL) != 0) {
 443                 DEBUG(0, ("Could not log NT token\n"));
 444                 TALLOC_FREE(frame);
 445                 return NT_STATUS_ACCESS_DENIED;
 446         }
 447
 448         TALLOC_FREE(frame);
 449         return NT_STATUS_OK;
 450 }
 451
 452 /*
 453  * Create the token to use from server_info->info3 and
 454  * server_info->sids (the info3/sam groups). Find the unix gids.
 455  */
 456
 457 NTSTATUS create_local_token(TALLOC_CTX *mem_ctx,
 458                             const struct auth_serversupplied_info *server_info,
 459                             DATA_BLOB *session_key,
 460                             const char *smb_username, /* for ->sanitized_username, for %U subs */
 461                             struct auth_session_info **session_info_out)
 462 {
 463         struct security_token *t;
 464         NTSTATUS status;
 465         size_t i;
 466         struct dom_sid tmp_sid;
 467         struct auth_session_info *session_info;
 468         struct wbcUnixId *ids;
 469         fstring tmp;
 470
 471         /* Ensure we can't possible take a code path leading to a
 472          * null defref. */
 473         if (!server_info) {
 474                 return NT_STATUS_LOGON_FAILURE;
 475         }
 476
 477         session_info = talloc_zero(mem_ctx, struct auth_session_info);
 478         if (!session_info) {
 479                 return NT_STATUS_NO_MEMORY;
 480         }
 481
 482         session_info->unix_token = talloc_zero(session_info, struct security_unix_token);
 483         if (!session_info->unix_token) {
 484                 TALLOC_FREE(session_info);
 485                 return NT_STATUS_NO_MEMORY;
 486         }
 487
 488         session_info->unix_token->uid = server_info->utok.uid;
 489         session_info->unix_token->gid = server_info->utok.gid;
 490
 491         session_info->unix_info = talloc_zero(session_info, struct auth_user_info_unix);
 492         if (!session_info->unix_info) {
 493                 TALLOC_FREE(session_info);
 494                 return NT_STATUS_NO_MEMORY;
 495         }
 496
 497         session_info->unix_info->unix_name = talloc_strdup(session_info, server_info->unix_name);
 498         if (!session_info->unix_info->unix_name) {
 499                 TALLOC_FREE(session_info);
 500                 return NT_STATUS_NO_MEMORY;
 501         }
 502
 503         /* This is a potentially untrusted username for use in %U */
 504         alpha_strcpy(tmp, smb_username, ". _-$", sizeof(tmp));
 505         session_info->unix_info->sanitized_username =
 506                                 talloc_strdup(session_info->unix_info, tmp);
 507
 508         session_info->unix_info->system = server_info->system;
 509
 510         if (session_key) {
 511                 data_blob_free(&session_info->session_key);
 512                 session_info->session_key = data_blob_talloc(session_info,
 513                                                                   session_key->data,
 514                                                                   session_key->length);
 515                 if (!session_info->session_key.data && session_key->length) {
 516                         return NT_STATUS_NO_MEMORY;
 517                 }
 518         } else {
 519                 session_info->session_key = data_blob_talloc( session_info, server_info->session_key.data,
 520                                                               server_info->session_key.length);
 521         }
 522
 523         if (session_info->security_token) {
 524                 /* Just copy the token, it has already been finalised
 525                  * (nasty hack to support a cached guest session_info,
 526                  * and a possible strategy for auth_samba4 to pass in
 527                  * a finalised session) */
 528
 529                 session_info->security_token = dup_nt_token(session_info, server_info->security_token);
 530                 if (!session_info->security_token) {
 531                         TALLOC_FREE(session_info);
 532                         return NT_STATUS_NO_MEMORY;
 533                 }
 534
 535                 session_info->unix_token->ngroups = server_info->utok.ngroups;
 536                 if (server_info->utok.ngroups != 0) {
 537                         session_info->unix_token->groups = (gid_t *)talloc_memdup(
 538                                 session_info->unix_token, server_info->utok.groups,
 539                                 sizeof(gid_t)*session_info->unix_token->ngroups);
 540                 } else {
 541                         session_info->unix_token->groups = NULL;
 542                 }
 543
 544                 *session_info_out = session_info;
 545                 return NT_STATUS_OK;
 546         }
 547
 548         /* We need to populate session_info->info with the information found in server_info->info3 */
 549         status = make_user_info_SamBaseInfo(session_info, "", &server_info->info3->base,
 550                                             server_info->guest == false,
 551                                             &session_info->info);
 552         if (!NT_STATUS_IS_OK(status)) {
 553                 DEBUG(0, ("conversion of info3 into auth_user_info failed!\n"));
 554                 TALLOC_FREE(session_info);
 555                 return status;
 556         }
 557
 558         /*
 559          * If winbind is not around, we can not make much use of the SIDs the
 560          * domain controller provided us with. Likewise if the user name was
 561          * mapped to some local unix user.
 562          */
 563
 564         if (((lp_server_role() == ROLE_DOMAIN_MEMBER) && !winbind_ping()) ||
 565             (server_info->nss_token)) {
 566                 char *found_username = NULL;
 567                 status = create_token_from_username(session_info,
 568                                                     server_info->unix_name,
 569                                                     server_info->guest,
 570                                                     &session_info->unix_token->uid,
 571                                                     &session_info->unix_token->gid,
 572                                                     &found_username,
 573                                                     &session_info->security_token);
 574                 if (NT_STATUS_IS_OK(status)) {
 575                         session_info->unix_info->unix_name = found_username;
 576                 }
 577         } else {
 578                 status = create_local_nt_token_from_info3(session_info,
 579                                                           server_info->guest,
 580                                                           server_info->info3,
 581                                                           &server_info->extra,
 582                                                           &session_info->security_token);
 583         }
 584
 585         if (!NT_STATUS_IS_OK(status)) {
 586                 return status;
 587         }
 588
 589         /* Convert the SIDs to gids. */
 590
 591         session_info->unix_token->ngroups = 0;
 592         session_info->unix_token->groups = NULL;
 593
 594         t = session_info->security_token;
 595
 596         ids = talloc_array(talloc_tos(), struct wbcUnixId,
 597                            t->num_sids);
 598         if (ids == NULL) {
 599                 return NT_STATUS_NO_MEMORY;
 600         }
 601
 602         if (!sids_to_unix_ids(t->sids, t->num_sids, ids)) {
 603                 TALLOC_FREE(ids);
 604                 return NT_STATUS_NO_MEMORY;
 605         }
 606
 607         /* Start at index 1, where the groups start. */
 608
 609         for (i=1; i<t->num_sids; i++) {
 610
 611                 if (ids[i].type != WBC_ID_TYPE_GID) {
 612                         DEBUG(10, ("Could not convert SID %s to gid, "
 613                                    "ignoring it\n",
 614                                    sid_string_dbg(&t->sids[i])));
 615                         continue;
 616                 }
 617                 if (!add_gid_to_array_unique(session_info, ids[i].id.gid,
 618                                              &session_info->unix_token->groups,
 619                                              &session_info->unix_token->ngroups)) {
 620                         return NT_STATUS_NO_MEMORY;
 621                 }
 622         }
 623
 624         /*
 625          * Add the "Unix Group" SID for each gid to catch mapped groups
 626          * and their Unix equivalent.  This is to solve the backwards
 627          * compatibility problem of 'valid users = +ntadmin' where
 628          * ntadmin has been paired with "Domain Admins" in the group
 629          * mapping table.  Otherwise smb.conf would need to be changed
 630          * to 'valid user = "Domain Admins"'.  --jerry
 631          *
 632          * For consistency we also add the "Unix User" SID,
 633          * so that the complete unix token is represented within
 634          * the nt token.
 635          */
 636
 637         uid_to_unix_users_sid(session_info->unix_token->uid, &tmp_sid);
 638
 639         add_sid_to_array_unique(session_info->security_token, &tmp_sid,
 640                                 &session_info->security_token->sids,
 641                                 &session_info->security_token->num_sids);
 642
 643         for ( i=0; i<session_info->unix_token->ngroups; i++ ) {
 644                 gid_to_unix_groups_sid(session_info->unix_token->groups[i], &tmp_sid);
 645                 add_sid_to_array_unique(session_info->security_token, &tmp_sid,
 646                                         &session_info->security_token->sids,
 647                                         &session_info->security_token->num_sids);
 648         }
 649
 650         security_token_debug(DBGC_AUTH, 10, session_info->security_token);
 651         debug_unix_user_token(DBGC_AUTH, 10,
 652                               session_info->unix_token->uid,
 653                               session_info->unix_token->gid,
 654                               session_info->unix_token->ngroups,
 655                               session_info->unix_token->groups);
 656
 657         status = log_nt_token(session_info->security_token);
 658         if (!NT_STATUS_IS_OK(status)) {
 659                 return status;
 660         }
 661
 662         *session_info_out = session_info;
 663         return NT_STATUS_OK;
 664 }
 665
 666 /***************************************************************************
 667  Make (and fill) a server_info struct from a 'struct passwd' by conversion
 668  to a struct samu
 669 ***************************************************************************/
 670
 671 NTSTATUS make_server_info_pw(struct auth_serversupplied_info **server_info,
 672                              char *unix_username,
 673                              struct passwd *pwd)
 674 {
 675         NTSTATUS status;
 676         struct samu *sampass = NULL;
 677         char *qualified_name = NULL;
 678         TALLOC_CTX *mem_ctx = NULL;
 679         struct dom_sid u_sid;
 680         enum lsa_SidType type;
 681         struct auth_serversupplied_info *result;
 682
 683         /*
 684          * The SID returned in server_info->sam_account is based
 685          * on our SAM sid even though for a pure UNIX account this should
 686          * not be the case as it doesn't really exist in the SAM db.
 687          * This causes lookups on "[in]valid users" to fail as they
 688          * will lookup this name as a "Unix User" SID to check against
 689          * the user token. Fix this by adding the "Unix User"\unix_username
 690          * SID to the sid array. The correct fix should probably be
 691          * changing the server_info->sam_account user SID to be a
 692          * S-1-22 Unix SID, but this might break old configs where
 693          * plaintext passwords were used with no SAM backend.
 694          */
 695
 696         mem_ctx = talloc_init("make_server_info_pw_tmp");
 697         if (!mem_ctx) {
 698                 return NT_STATUS_NO_MEMORY;
 699         }
 700
 701         qualified_name = talloc_asprintf(mem_ctx, "%s\\%s",
 702                                         unix_users_domain_name(),
 703                                         unix_username );
 704         if (!qualified_name) {
 705                 TALLOC_FREE(mem_ctx);
 706                 return NT_STATUS_NO_MEMORY;
 707         }
 708
 709         if (!lookup_name(mem_ctx, qualified_name, LOOKUP_NAME_ALL,
 710                                                 NULL, NULL,
 711                                                 &u_sid, &type)) {
 712                 TALLOC_FREE(mem_ctx);
 713                 return NT_STATUS_NO_SUCH_USER;
 714         }
 715
 716         TALLOC_FREE(mem_ctx);
 717
 718         if (type != SID_NAME_USER) {
 719                 return NT_STATUS_NO_SUCH_USER;
 720         }
 721
 722         if ( !(sampass = samu_new( NULL )) ) {
 723                 return NT_STATUS_NO_MEMORY;
 724         }
 725
 726         status = samu_set_unix( sampass, pwd );
 727         if (!NT_STATUS_IS_OK(status)) {
 728                 return status;
 729         }
 730
 731         /* In pathological cases the above call can set the account
 732          * name to the DOMAIN\username form. Reset the account name
 733          * using unix_username */
 734         pdb_set_username(sampass, unix_username, PDB_SET);
 735
 736         /* set the user sid to be the calculated u_sid */
 737         pdb_set_user_sid(sampass, &u_sid, PDB_SET);
 738
 739         result = make_server_info(NULL);
 740         if (result == NULL) {
 741                 TALLOC_FREE(sampass);
 742                 return NT_STATUS_NO_MEMORY;
 743         }
 744
 745         status = samu_to_SamInfo3(result, sampass, lp_netbios_name(),
 746                                   &result->info3, &result->extra);
 747         TALLOC_FREE(sampass);
 748         if (!NT_STATUS_IS_OK(status)) {
 749                 DEBUG(10, ("Failed to convert samu to info3: %s\n",
 750                            nt_errstr(status)));
 751                 TALLOC_FREE(result);
 752                 return status;
 753         }
 754
 755         result->unix_name = talloc_strdup(result, unix_username);
 756
 757         if (result->unix_name == NULL) {
 758                 TALLOC_FREE(result);
 759                 return NT_STATUS_NO_MEMORY;
 760         }
 761
 762         result->utok.uid = pwd->pw_uid;
 763         result->utok.gid = pwd->pw_gid;
 764
 765         *server_info = result;
 766
 767         return NT_STATUS_OK;
 768 }
 769
 770 static NTSTATUS get_guest_info3(TALLOC_CTX *mem_ctx,
 771                                 struct netr_SamInfo3 *info3)
 772 {
 773         const char *guest_account = lp_guestaccount();
 774         struct dom_sid domain_sid;
 775         struct passwd *pwd;
 776         const char *tmp;
 777
 778         pwd = Get_Pwnam_alloc(mem_ctx, guest_account);
 779         if (pwd == NULL) {
 780                 DEBUG(0,("SamInfo3_for_guest: Unable to locate guest "
 781                          "account [%s]!\n", guest_account));
 782                 return NT_STATUS_NO_SUCH_USER;
 783         }
 784
 785         /* Set account name */
 786         tmp = talloc_strdup(mem_ctx, pwd->pw_name);
 787         if (tmp == NULL) {
 788                 return NT_STATUS_NO_MEMORY;
 789         }
 790         init_lsa_String(&info3->base.account_name, tmp);
 791
 792         /* Set domain name */
 793         tmp = talloc_strdup(mem_ctx, get_global_sam_name());
 794         if (tmp == NULL) {
 795                 return NT_STATUS_NO_MEMORY;
 796         }
 797         init_lsa_StringLarge(&info3->base.domain, tmp);
 798
 799         /* Domain sid */
 800         sid_copy(&domain_sid, get_global_sam_sid());
 801
 802         info3->base.domain_sid = dom_sid_dup(mem_ctx, &domain_sid);
 803         if (info3->base.domain_sid == NULL) {
 804                 return NT_STATUS_NO_MEMORY;
 805         }
 806
 807         /* Guest rid */
 808         info3->base.rid = DOMAIN_RID_GUEST;
 809
 810         /* Primary gid */
 811         info3->base.primary_gid = BUILTIN_RID_GUESTS;
 812
 813         /* Set as guest */
 814         info3->base.user_flags = NETLOGON_GUEST;
 815
 816         TALLOC_FREE(pwd);
 817         return NT_STATUS_OK;
 818 }
 819
 820 /***************************************************************************
 821  Make (and fill) a user_info struct for a guest login.
 822  This *must* succeed for smbd to start. If there is no mapping entry for
 823  the guest gid, then create one.
 824
 825  The resulting structure is a 'session_info' because
 826  create_local_token() has already been called on it.  This is quite
 827  nasty, as the auth subsystem isn't expect this, but the behavior is
 828  left as-is for now.
 829 ***************************************************************************/
 830
 831 static NTSTATUS make_new_session_info_guest(struct auth_session_info **session_info, struct auth_serversupplied_info **server_info)
 832 {
 833         static const char zeros[16] = {0};
 834         const char *guest_account = lp_guestaccount();
 835         const char *domain = lp_netbios_name();
 836         struct netr_SamInfo3 info3;
 837         TALLOC_CTX *tmp_ctx;
 838         NTSTATUS status;
 839
 840         tmp_ctx = talloc_stackframe();
 841         if (tmp_ctx == NULL) {
 842                 return NT_STATUS_NO_MEMORY;
 843         }
 844
 845         ZERO_STRUCT(info3);
 846
 847         status = get_guest_info3(tmp_ctx, &info3);
 848         if (!NT_STATUS_IS_OK(status)) {
 849                 DEBUG(0, ("get_guest_info3 failed with %s\n",
 850                           nt_errstr(status)));
 851                 goto done;
 852         }
 853
 854         status = make_server_info_info3(tmp_ctx,
 855                                         guest_account,
 856                                         domain,
 857                                         server_info,
 858                                         &info3);
 859         if (!NT_STATUS_IS_OK(status)) {
 860                 DEBUG(0, ("make_server_info_info3 failed with %s\n",
 861                           nt_errstr(status)));
 862                 goto done;
 863         }
 864
 865         (*server_info)->guest = true;
 866
 867         /* This should not be done here (we should produce a server
 868          * info, and later construct a session info from it), but for
 869          * now this does not change the previous behavior */
 870         status = create_local_token(tmp_ctx, *server_info, NULL,
 871                                     (*server_info)->info3->base.account_name.string,
 872                                     session_info);
 873         if (!NT_STATUS_IS_OK(status)) {
 874                 DEBUG(0, ("create_local_token failed: %s\n",
 875                           nt_errstr(status)));
 876                 goto done;
 877         }
 878         talloc_steal(NULL, *session_info);
 879         talloc_steal(NULL, *server_info);
 880
 881         /* annoying, but the Guest really does have a session key, and it is
 882            all zeros! */
 883         (*session_info)->session_key = data_blob(zeros, sizeof(zeros));
 884
 885         status = NT_STATUS_OK;
 886 done:
 887         TALLOC_FREE(tmp_ctx);
 888         return status;
 889 }
 890
 891 /***************************************************************************
 892  Make (and fill) a auth_session_info struct for a system user login.
 893  This *must* succeed for smbd to start.
 894 ***************************************************************************/
 895
 896 static NTSTATUS make_new_session_info_system(TALLOC_CTX *mem_ctx,
 897                                             struct auth_session_info **session_info)
 898 {
 899         struct passwd *pwd;
 900         NTSTATUS status;
 901
 902         pwd = getpwuid_alloc(mem_ctx, sec_initial_uid());
 903         if (pwd == NULL) {
 904                 return NT_STATUS_NO_SUCH_USER;
 905         }
 906
 907         status = make_session_info_from_username(mem_ctx,
 908                                                  pwd->pw_name,
 909                                                  false,
 910                                                  session_info);
 911         TALLOC_FREE(pwd);
 912         if (!NT_STATUS_IS_OK(status)) {
 913                 return status;
 914         }
 915
 916         (*session_info)->unix_info->system = true;
 917
 918         status = add_sid_to_array_unique((*session_info)->security_token->sids,
 919                                          &global_sid_System,
 920                                          &(*session_info)->security_token->sids,
 921                                          &(*session_info)->security_token->num_sids);
 922         if (!NT_STATUS_IS_OK(status)) {
 923                 TALLOC_FREE((*session_info));
 924                 return status;
 925         }
 926
 927         return NT_STATUS_OK;
 928 }
 929
 930 /****************************************************************************
 931   Fake a auth_session_info just from a username (as a
 932   session_info structure, with create_local_token() already called on
 933   it.
 934 ****************************************************************************/
 935
 936 NTSTATUS make_session_info_from_username(TALLOC_CTX *mem_ctx,
 937                                          const char *username,
 938                                          bool is_guest,
 939                                          struct auth_session_info **session_info)
 940 {
 941         struct auth_serversupplied_info *result;
 942         struct passwd *pwd;
 943         NTSTATUS status;
 944
 945         pwd = Get_Pwnam_alloc(talloc_tos(), username);
 946         if (pwd == NULL) {
 947                 return NT_STATUS_NO_SUCH_USER;
 948         }
 949
 950         status = make_server_info_pw(&result, pwd->pw_name, pwd);
 951
 952         if (!NT_STATUS_IS_OK(status)) {
 953                 TALLOC_FREE(pwd);
 954                 return status;
 955         }
 956
 957         result->nss_token = true;
 958         result->guest = is_guest;
 959
 960         /* Now turn the server_info into a session_info with the full token etc */
 961         status = create_local_token(mem_ctx, result, NULL, pwd->pw_name, session_info);
 962         TALLOC_FREE(pwd);
 963         talloc_free(result);
 964         return status;
 965 }
 966
 967 /* This function MUST only used to create the cached server_info for
 968  * guest.
 969  *
 970  * This is a lossy conversion.  Variables known to be lost so far
 971  * include:
 972  *
 973  * - nss_token (not needed because the only read doesn't happen
 974  * for the GUEST user, as this routine populates ->security_token
 975  *
 976  * - extra (not needed because the guest account must have valid RIDs per the output of get_guest_info3())
 977  *
 978  * - The 'server_info' parameter allows the missing 'info3' to be copied across.
 979  */
 980 static struct auth_serversupplied_info *copy_session_info_serverinfo_guest(TALLOC_CTX *mem_ctx,
 981                                                                            const struct auth_session_info *src,
 982                                                                            struct auth_serversupplied_info *server_info)
 983 {
 984         struct auth_serversupplied_info *dst;
 985
 986         dst = make_server_info(mem_ctx);
 987         if (dst == NULL) {
 988                 return NULL;
 989         }
 990
 991         /* This element must be provided to convert back to an auth_serversupplied_info */
 992         SMB_ASSERT(src->unix_info);
 993
 994         dst->guest = true;
 995         dst->system = false;
 996
 997         /* This element must be provided to convert back to an
 998          * auth_serversupplied_info.  This needs to be from the
 999          * auth_session_info because the group values in particular
1000          * may change during create_local_token() processing */
1001         SMB_ASSERT(src->unix_token);
1002         dst->utok.uid = src->unix_token->uid;
1003         dst->utok.gid = src->unix_token->gid;
1004         dst->utok.ngroups = src->unix_token->ngroups;
1005         if (src->unix_token->ngroups != 0) {
1006                 dst->utok.groups = (gid_t *)talloc_memdup(
1007                         dst, src->unix_token->groups,
1008                         sizeof(gid_t)*dst->utok.ngroups);
1009         } else {
1010                 dst->utok.groups = NULL;
1011         }
1012
1013         /* We must have a security_token as otherwise the lossy
1014          * conversion without nss_token would cause create_local_token
1015          * to take the wrong path */
1016         SMB_ASSERT(src->security_token);
1017
1018         dst->security_token = dup_nt_token(dst, src->security_token);
1019         if (!dst->security_token) {
1020                 TALLOC_FREE(dst);
1021                 return NULL;
1022         }
1023
1024         dst->session_key = data_blob_talloc( dst, src->session_key.data,
1025                                                 src->session_key.length);
1026
1027         /* This is OK because this functions is only used for the
1028          * GUEST account, which has all-zero keys for both values */
1029         dst->lm_session_key = data_blob_talloc(dst, src->session_key.data,
1030                                                 src->session_key.length);
1031
1032         dst->info3 = copy_netr_SamInfo3(dst, server_info->info3);
1033         if (!dst->info3) {
1034                 TALLOC_FREE(dst);
1035                 return NULL;
1036         }
1037
1038         dst->unix_name = talloc_strdup(dst, src->unix_info->unix_name);
1039         if (!dst->unix_name) {
1040                 TALLOC_FREE(dst);
1041                 return NULL;
1042         }
1043
1044         return dst;
1045 }
1046
1047 struct auth_session_info *copy_session_info(TALLOC_CTX *mem_ctx,
1048                                              const struct auth_session_info *src)
1049 {
1050         struct auth_session_info *dst;
1051         DATA_BLOB blob;
1052         enum ndr_err_code ndr_err;
1053
1054         ndr_err = ndr_push_struct_blob(
1055                 &blob, talloc_tos(), src,
1056                 (ndr_push_flags_fn_t)ndr_push_auth_session_info);
1057         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1058                 DEBUG(0, ("copy_session_info(): ndr_push_auth_session_info failed: "
1059                            "%s\n", ndr_errstr(ndr_err)));
1060                 return NULL;
1061         }
1062
1063         dst = talloc(mem_ctx, struct auth_session_info);
1064         if (dst == NULL) {
1065                 DEBUG(0, ("talloc failed\n"));
1066                 TALLOC_FREE(blob.data);
1067                 return NULL;
1068         }
1069
1070         ndr_err = ndr_pull_struct_blob(
1071                 &blob, dst, dst,
1072                 (ndr_pull_flags_fn_t)ndr_pull_auth_session_info);
1073         TALLOC_FREE(blob.data);
1074
1075         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1076                 DEBUG(0, ("copy_session_info(): ndr_pull_auth_session_info failed: "
1077                            "%s\n", ndr_errstr(ndr_err)));
1078                 TALLOC_FREE(dst);
1079                 return NULL;
1080         }
1081
1082         return dst;
1083 }
1084
1085 /*
1086  * Set a new session key. Used in the rpc server where we have to override the
1087  * SMB level session key with SystemLibraryDTC
1088  */
1089
1090 bool session_info_set_session_key(struct auth_session_info *info,
1091                                  DATA_BLOB session_key)
1092 {
1093         TALLOC_FREE(info->session_key.data);
1094
1095         info->session_key = data_blob_talloc(
1096                 info, session_key.data, session_key.length);
1097
1098         return (info->session_key.data != NULL);
1099 }
1100
1101 static struct auth_session_info *guest_info = NULL;
1102
1103 static struct auth_serversupplied_info *guest_server_info = NULL;
1104
1105 bool init_guest_info(void)
1106 {
1107         if (guest_info != NULL)
1108                 return true;
1109
1110         return NT_STATUS_IS_OK(make_new_session_info_guest(&guest_info, &guest_server_info));
1111 }
1112
1113 NTSTATUS make_server_info_guest(TALLOC_CTX *mem_ctx,
1114                                 struct auth_serversupplied_info **server_info)
1115 {
1116         /* This is trickier than it would appear to need to be because
1117          * we are trying to avoid certain costly operations when the
1118          * structure is converted to a 'auth_session_info' again in
1119          * create_local_token() */
1120         *server_info = copy_session_info_serverinfo_guest(mem_ctx, guest_info, guest_server_info);
1121         return (*server_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
1122 }
1123
1124 NTSTATUS make_session_info_guest(TALLOC_CTX *mem_ctx,
1125                                 struct auth_session_info **session_info)
1126 {
1127         *session_info = copy_session_info(mem_ctx, guest_info);
1128         return (*session_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
1129 }
1130
1131 static struct auth_session_info *system_info = NULL;
1132
1133 NTSTATUS init_system_info(void)
1134 {
1135         if (system_info != NULL)
1136                 return NT_STATUS_OK;
1137
1138         return make_new_session_info_system(NULL, &system_info);
1139 }
1140
1141 NTSTATUS make_session_info_system(TALLOC_CTX *mem_ctx,
1142                                 struct auth_session_info **session_info)
1143 {
1144         if (system_info == NULL) return NT_STATUS_UNSUCCESSFUL;
1145         *session_info = copy_session_info(mem_ctx, system_info);
1146         return (*session_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
1147 }
1148
1149 const struct auth_session_info *get_session_info_system(void)
1150 {
1151     return system_info;
1152 }
1153
1154 bool copy_current_user(struct current_user *dst, struct current_user *src)
1155 {
1156         gid_t *groups;
1157         struct security_token *nt_token;
1158
1159         groups = (gid_t *)memdup(src->ut.groups,
1160                                  sizeof(gid_t) * src->ut.ngroups);
1161         if ((src->ut.ngroups != 0) && (groups == NULL)) {
1162                 return false;
1163         }
1164
1165         nt_token = dup_nt_token(NULL, src->nt_user_token);
1166         if (nt_token == NULL) {
1167                 SAFE_FREE(groups);
1168                 return false;
1169         }
1170
1171         dst->conn = src->conn;
1172         dst->vuid = src->vuid;
1173         dst->ut.uid = src->ut.uid;
1174         dst->ut.gid = src->ut.gid;
1175         dst->ut.ngroups = src->ut.ngroups;
1176         dst->ut.groups = groups;
1177         dst->nt_user_token = nt_token;
1178         return true;
1179 }
1180
1181 /***************************************************************************
1182  Purely internal function for make_server_info_info3
1183 ***************************************************************************/
1184
1185 static NTSTATUS check_account(TALLOC_CTX *mem_ctx, const char *domain,
1186                               const char *username, char **found_username,
1187                               struct passwd **pwd,
1188                               bool *username_was_mapped)
1189 {
1190         char *orig_dom_user = NULL;
1191         char *dom_user = NULL;
1192         char *lower_username = NULL;
1193         char *real_username = NULL;
1194         struct passwd *passwd;
1195
1196         lower_username = talloc_strdup(mem_ctx, username);
1197         if (!lower_username) {
1198                 return NT_STATUS_NO_MEMORY;
1199         }
1200         strlower_m( lower_username );
1201
1202         orig_dom_user = talloc_asprintf(mem_ctx,
1203                                 "%s%c%s",
1204                                 domain,
1205                                 *lp_winbind_separator(),
1206                                 lower_username);
1207         if (!orig_dom_user) {
1208                 return NT_STATUS_NO_MEMORY;
1209         }
1210
1211         /* Get the passwd struct.  Try to create the account if necessary. */
1212
1213         *username_was_mapped = map_username(mem_ctx, orig_dom_user, &dom_user);
1214         if (!dom_user) {
1215                 return NT_STATUS_NO_MEMORY;
1216         }
1217
1218         passwd = smb_getpwnam(mem_ctx, dom_user, &real_username, true );
1219         if (!passwd) {
1220                 DEBUG(3, ("Failed to find authenticated user %s via "
1221                           "getpwnam(), denying access.\n", dom_user));
1222                 return NT_STATUS_NO_SUCH_USER;
1223         }
1224
1225         if (!real_username) {
1226                 return NT_STATUS_NO_MEMORY;
1227         }
1228
1229         *pwd = passwd;
1230
1231         /* This is pointless -- there is no support for differing
1232            unix and windows names.  Make sure to always store the
1233            one we actually looked up and succeeded. Have I mentioned
1234            why I hate the 'winbind use default domain' parameter?
1235                                          --jerry              */
1236
1237         *found_username = talloc_strdup( mem_ctx, real_username );
1238
1239         return NT_STATUS_OK;
1240 }
1241
1242 /****************************************************************************
1243  Wrapper to allow the getpwnam() call to strip the domain name and
1244  try again in case a local UNIX user is already there.  Also run through
1245  the username if we fallback to the username only.
1246  ****************************************************************************/
1247
1248 struct passwd *smb_getpwnam( TALLOC_CTX *mem_ctx, const char *domuser,
1249                              char **p_save_username, bool create )
1250 {
1251         struct passwd *pw = NULL;
1252         char *p = NULL;
1253         char *username = NULL;
1254
1255         /* we only save a copy of the username it has been mangled
1256            by winbindd use default domain */
1257         *p_save_username = NULL;
1258
1259         /* don't call map_username() here since it has to be done higher
1260            up the stack so we don't call it multiple times */
1261
1262         username = talloc_strdup(mem_ctx, domuser);
1263         if (!username) {
1264                 return NULL;
1265         }
1266
1267         p = strchr_m( username, *lp_winbind_separator() );
1268
1269         /* code for a DOMAIN\user string */
1270
1271         if ( p ) {
1272                 pw = Get_Pwnam_alloc( mem_ctx, domuser );
1273                 if ( pw ) {
1274                         /* make sure we get the case of the username correct */
1275                         /* work around 'winbind use default domain = yes' */
1276
1277                         if ( !strchr_m( pw->pw_name, *lp_winbind_separator() ) ) {
1278                                 char *domain;
1279
1280                                 /* split the domain and username into 2 strings */
1281                                 *p = '\0';
1282                                 domain = username;
1283
1284                                 *p_save_username = talloc_asprintf(mem_ctx,
1285                                                                 "%s%c%s",
1286                                                                 domain,
1287                                                                 *lp_winbind_separator(),
1288                                                                 pw->pw_name);
1289                                 if (!*p_save_username) {
1290                                         TALLOC_FREE(pw);
1291                                         return NULL;
1292                                 }
1293                         } else {
1294                                 *p_save_username = talloc_strdup(mem_ctx, pw->pw_name);
1295                         }
1296
1297                         /* whew -- done! */
1298                         return pw;
1299                 }
1300
1301                 /* setup for lookup of just the username */
1302                 /* remember that p and username are overlapping memory */
1303
1304                 p++;
1305                 username = talloc_strdup(mem_ctx, p);
1306                 if (!username) {
1307                         return NULL;
1308                 }
1309         }
1310
1311         /* just lookup a plain username */
1312
1313         pw = Get_Pwnam_alloc(mem_ctx, username);
1314
1315         /* Create local user if requested but only if winbindd
1316            is not running.  We need to protect against cases
1317            where winbindd is failing and then prematurely
1318            creating users in /etc/passwd */
1319
1320         if ( !pw && create && !winbind_ping() ) {
1321                 /* Don't add a machine account. */
1322                 if (username[strlen(username)-1] == '$')
1323                         return NULL;
1324
1325                 _smb_create_user(NULL, username, NULL);
1326                 pw = Get_Pwnam_alloc(mem_ctx, username);
1327         }
1328
1329         /* one last check for a valid passwd struct */
1330
1331         if (pw) {
1332                 *p_save_username = talloc_strdup(mem_ctx, pw->pw_name);
1333         }
1334         return pw;
1335 }
1336
1337 /***************************************************************************
1338  Make a server_info struct from the info3 returned by a domain logon
1339 ***************************************************************************/
1340
1341 NTSTATUS make_server_info_info3(TALLOC_CTX *mem_ctx,
1342                                 const char *sent_nt_username,
1343                                 const char *domain,
1344                                 struct auth_serversupplied_info **server_info,
1345                                 struct netr_SamInfo3 *info3)
1346 {
1347         static const char zeros[16] = {0, };
1348
1349         NTSTATUS nt_status = NT_STATUS_OK;
1350         char *found_username = NULL;
1351         const char *nt_domain;
1352         const char *nt_username;
1353         bool username_was_mapped;
1354         struct passwd *pwd;
1355         struct auth_serversupplied_info *result;
1356         struct dom_sid *group_sid;
1357         struct netr_SamInfo3 *i3;
1358
1359         /*
1360            Here is where we should check the list of
1361            trusted domains, and verify that the SID
1362            matches.
1363         */
1364
1365         nt_username = talloc_strdup(mem_ctx, info3->base.account_name.string);
1366         if (!nt_username) {
1367                 /* If the server didn't give us one, just use the one we sent
1368                  * them */
1369                 nt_username = sent_nt_username;
1370         }
1371
1372         nt_domain = talloc_strdup(mem_ctx, info3->base.domain.string);
1373         if (!nt_domain) {
1374                 /* If the server didn't give us one, just use the one we sent
1375                  * them */
1376                 nt_domain = domain;
1377         }
1378
1379         /* If getpwnam() fails try the add user script (2.2.x behavior).
1380
1381            We use the _unmapped_ username here in an attempt to provide
1382            consistent username mapping behavior between kerberos and NTLM[SSP]
1383            authentication in domain mode security.  I.E. Username mapping
1384            should be applied to the fully qualified username
1385            (e.g. DOMAIN\user) and not just the login name.  Yes this means we
1386            called map_username() unnecessarily in make_user_info_map() but
1387            that is how the current code is designed.  Making the change here
1388            is the least disruptive place.  -- jerry */
1389
1390         /* this call will try to create the user if necessary */
1391
1392         nt_status = check_account(mem_ctx, nt_domain, sent_nt_username,
1393                                      &found_username, &pwd,
1394                                      &username_was_mapped);
1395
1396         if (!NT_STATUS_IS_OK(nt_status)) {
1397                 return nt_status;
1398         }
1399
1400         result = make_server_info(NULL);
1401         if (result == NULL) {
1402                 DEBUG(4, ("make_server_info failed!\n"));
1403                 return NT_STATUS_NO_MEMORY;
1404         }
1405
1406         result->unix_name = talloc_strdup(result, found_username);
1407
1408         /* copy in the info3 */
1409         result->info3 = i3 = copy_netr_SamInfo3(result, info3);
1410         if (result->info3 == NULL) {
1411                 TALLOC_FREE(result);
1412                 return NT_STATUS_NO_MEMORY;
1413         }
1414
1415         /* Fill in the unix info we found on the way */
1416         result->utok.uid = pwd->pw_uid;
1417         result->utok.gid = pwd->pw_gid;
1418
1419         /* We can't just trust that the primary group sid sent us is something
1420          * we can really use. Obtain the usable sid, and store the original
1421          * one as an additional group if it had to be replaced */
1422         nt_status = get_primary_group_sid(mem_ctx, found_username,
1423                                           &pwd, &group_sid);
1424         if (!NT_STATUS_IS_OK(nt_status)) {
1425                 TALLOC_FREE(result);
1426                 return nt_status;
1427         }
1428
1429         /* store and check if it is the same we got originally */
1430         sid_peek_rid(group_sid, &i3->base.primary_gid);
1431         if (i3->base.primary_gid != info3->base.primary_gid) {
1432                 uint32_t n = i3->base.groups.count;
1433                 /* not the same, store the original as an additional group */
1434                 i3->base.groups.rids =
1435                         talloc_realloc(i3, i3->base.groups.rids,
1436                                         struct samr_RidWithAttribute, n + 1);
1437                 if (i3->base.groups.rids == NULL) {
1438                         TALLOC_FREE(result);
1439                         return NT_STATUS_NO_MEMORY;
1440                 }
1441                 i3->base.groups.rids[n].rid = info3->base.primary_gid;
1442                 i3->base.groups.rids[n].attributes = SE_GROUP_ENABLED;
1443                 i3->base.groups.count = n + 1;
1444         }
1445
1446         /* ensure we are never given NULL session keys */
1447
1448         if (memcmp(info3->base.key.key, zeros, sizeof(zeros)) == 0) {
1449                 result->session_key = data_blob_null;
1450         } else {
1451                 result->session_key = data_blob_talloc(
1452                         result, info3->base.key.key,
1453                         sizeof(info3->base.key.key));
1454         }
1455
1456         if (memcmp(info3->base.LMSessKey.key, zeros, 8) == 0) {
1457                 result->lm_session_key = data_blob_null;
1458         } else {
1459                 result->lm_session_key = data_blob_talloc(
1460                         result, info3->base.LMSessKey.key,
1461                         sizeof(info3->base.LMSessKey.key));
1462         }
1463
1464         result->nss_token |= username_was_mapped;
1465
1466         result->guest = (info3->base.user_flags & NETLOGON_GUEST);
1467
1468         *server_info = result;
1469
1470         return NT_STATUS_OK;
1471 }
1472
1473 /*****************************************************************************
1474  Make a server_info struct from the wbcAuthUserInfo returned by a domain logon
1475 ******************************************************************************/
1476
1477 NTSTATUS make_server_info_wbcAuthUserInfo(TALLOC_CTX *mem_ctx,
1478                                           const char *sent_nt_username,
1479                                           const char *domain,
1480                                           const struct wbcAuthUserInfo *info,
1481                                           struct auth_serversupplied_info **server_info)
1482 {
1483         struct netr_SamInfo3 *info3;
1484
1485         info3 = wbcAuthUserInfo_to_netr_SamInfo3(mem_ctx, info);
1486         if (!info3) {
1487                 return NT_STATUS_NO_MEMORY;
1488         }
1489
1490         return make_server_info_info3(mem_ctx,
1491                                       sent_nt_username, domain,
1492                                       server_info, info3);
1493 }
1494
1495 /**
1496  * Verify whether or not given domain is trusted.
1497  *
1498  * @param domain_name name of the domain to be verified
1499  * @return true if domain is one of the trusted ones or
1500  *         false if otherwise
1501  **/
1502
1503 bool is_trusted_domain(const char* dom_name)
1504 {
1505         struct dom_sid trustdom_sid;
1506         bool ret;
1507
1508         /* no trusted domains for a standalone server */
1509
1510         if ( lp_server_role() == ROLE_STANDALONE )
1511                 return false;
1512
1513         if (dom_name == NULL || dom_name[0] == '\0') {
1514                 return false;
1515         }
1516
1517         if (strequal(dom_name, get_global_sam_name())) {
1518                 return false;
1519         }
1520
1521         /* if we are a DC, then check for a direct trust relationships */
1522
1523         if ( IS_DC ) {
1524                 become_root();
1525                 DEBUG (5,("is_trusted_domain: Checking for domain trust with "
1526                           "[%s]\n", dom_name ));
1527                 ret = pdb_get_trusteddom_pw(dom_name, NULL, NULL, NULL);
1528                 unbecome_root();
1529                 if (ret)
1530                         return true;
1531         }
1532         else {
1533                 wbcErr result;
1534
1535                 /* If winbind is around, ask it */
1536
1537                 result = wb_is_trusted_domain(dom_name);
1538
1539                 if (result == WBC_ERR_SUCCESS) {
1540                         return true;
1541                 }
1542
1543                 if (result == WBC_ERR_DOMAIN_NOT_FOUND) {
1544                         /* winbind could not find the domain */
1545                         return false;
1546                 }
1547
1548                 /* The only other possible result is that winbind is not up
1549                    and running. We need to update the trustdom_cache
1550                    ourselves */
1551
1552                 update_trustdom_cache();
1553         }
1554
1555         /* now the trustdom cache should be available a DC could still
1556          * have a transitive trust so fall back to the cache of trusted
1557          * domains (like a domain member would use  */
1558
1559         if ( trustdom_cache_fetch(dom_name, &trustdom_sid) ) {
1560                 return true;
1561         }
1562
1563         return false;
1564 }
1565
1566
1567
1568 /*
1569   on a logon error possibly map the error to success if "map to guest"
1570   is set approriately
1571 */
1572 NTSTATUS do_map_to_guest_server_info(NTSTATUS status,
1573                                      struct auth_serversupplied_info **server_info,
1574                                      const char *user, const char *domain)
1575 {
1576         user = user ? user : "";
1577         domain = domain ? domain : "";
1578
1579         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
1580                 if ((lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_USER) ||
1581                     (lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_PASSWORD)) {
1582                         DEBUG(3,("No such user %s [%s] - using guest account\n",
1583                                  user, domain));
1584                         return make_server_info_guest(NULL, server_info);
1585                 }
1586         } else if (NT_STATUS_EQUAL(status, NT_STATUS_WRONG_PASSWORD)) {
1587                 if (lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_PASSWORD) {
1588                         DEBUG(3,("Registered username %s for guest access\n",
1589                                 user));
1590                         return make_server_info_guest(NULL, server_info);
1591                 }
1592         }
1593
1594         return status;
1595 }