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                     ids[i].type != WBC_ID_TYPE_BOTH) {
 613                         DEBUG(10, ("Could not convert SID %s to gid, "
 614                                    "ignoring it\n",
 615                                    sid_string_dbg(&t->sids[i])));
 616                         continue;
 617                 }
 618                 if (!add_gid_to_array_unique(session_info, ids[i].id.gid,
 619                                              &session_info->unix_token->groups,
 620                                              &session_info->unix_token->ngroups)) {
 621                         return NT_STATUS_NO_MEMORY;
 622                 }
 623         }
 624
 625         /*
 626          * Add the "Unix Group" SID for each gid to catch mapped groups
 627          * and their Unix equivalent.  This is to solve the backwards
 628          * compatibility problem of 'valid users = +ntadmin' where
 629          * ntadmin has been paired with "Domain Admins" in the group
 630          * mapping table.  Otherwise smb.conf would need to be changed
 631          * to 'valid user = "Domain Admins"'.  --jerry
 632          *
 633          * For consistency we also add the "Unix User" SID,
 634          * so that the complete unix token is represented within
 635          * the nt token.
 636          */
 637
 638         uid_to_unix_users_sid(session_info->unix_token->uid, &tmp_sid);
 639
 640         add_sid_to_array_unique(session_info->security_token, &tmp_sid,
 641                                 &session_info->security_token->sids,
 642                                 &session_info->security_token->num_sids);
 643
 644         for ( i=0; i<session_info->unix_token->ngroups; i++ ) {
 645                 gid_to_unix_groups_sid(session_info->unix_token->groups[i], &tmp_sid);
 646                 add_sid_to_array_unique(session_info->security_token, &tmp_sid,
 647                                         &session_info->security_token->sids,
 648                                         &session_info->security_token->num_sids);
 649         }
 650
 651         security_token_debug(DBGC_AUTH, 10, session_info->security_token);
 652         debug_unix_user_token(DBGC_AUTH, 10,
 653                               session_info->unix_token->uid,
 654                               session_info->unix_token->gid,
 655                               session_info->unix_token->ngroups,
 656                               session_info->unix_token->groups);
 657
 658         status = log_nt_token(session_info->security_token);
 659         if (!NT_STATUS_IS_OK(status)) {
 660                 return status;
 661         }
 662
 663         *session_info_out = session_info;
 664         return NT_STATUS_OK;
 665 }
 666
 667 /***************************************************************************
 668  Make (and fill) a server_info struct from a 'struct passwd' by conversion
 669  to a struct samu
 670 ***************************************************************************/
 671
 672 NTSTATUS make_server_info_pw(struct auth_serversupplied_info **server_info,
 673                              char *unix_username,
 674                              struct passwd *pwd)
 675 {
 676         NTSTATUS status;
 677         struct samu *sampass = NULL;
 678         char *qualified_name = NULL;
 679         TALLOC_CTX *mem_ctx = NULL;
 680         struct dom_sid u_sid;
 681         enum lsa_SidType type;
 682         struct auth_serversupplied_info *result;
 683
 684         /*
 685          * The SID returned in server_info->sam_account is based
 686          * on our SAM sid even though for a pure UNIX account this should
 687          * not be the case as it doesn't really exist in the SAM db.
 688          * This causes lookups on "[in]valid users" to fail as they
 689          * will lookup this name as a "Unix User" SID to check against
 690          * the user token. Fix this by adding the "Unix User"\unix_username
 691          * SID to the sid array. The correct fix should probably be
 692          * changing the server_info->sam_account user SID to be a
 693          * S-1-22 Unix SID, but this might break old configs where
 694          * plaintext passwords were used with no SAM backend.
 695          */
 696
 697         mem_ctx = talloc_init("make_server_info_pw_tmp");
 698         if (!mem_ctx) {
 699                 return NT_STATUS_NO_MEMORY;
 700         }
 701
 702         qualified_name = talloc_asprintf(mem_ctx, "%s\\%s",
 703                                         unix_users_domain_name(),
 704                                         unix_username );
 705         if (!qualified_name) {
 706                 TALLOC_FREE(mem_ctx);
 707                 return NT_STATUS_NO_MEMORY;
 708         }
 709
 710         if (!lookup_name(mem_ctx, qualified_name, LOOKUP_NAME_ALL,
 711                                                 NULL, NULL,
 712                                                 &u_sid, &type)) {
 713                 TALLOC_FREE(mem_ctx);
 714                 return NT_STATUS_NO_SUCH_USER;
 715         }
 716
 717         TALLOC_FREE(mem_ctx);
 718
 719         if (type != SID_NAME_USER) {
 720                 return NT_STATUS_NO_SUCH_USER;
 721         }
 722
 723         if ( !(sampass = samu_new( NULL )) ) {
 724                 return NT_STATUS_NO_MEMORY;
 725         }
 726
 727         status = samu_set_unix( sampass, pwd );
 728         if (!NT_STATUS_IS_OK(status)) {
 729                 return status;
 730         }
 731
 732         /* In pathological cases the above call can set the account
 733          * name to the DOMAIN\username form. Reset the account name
 734          * using unix_username */
 735         pdb_set_username(sampass, unix_username, PDB_SET);
 736
 737         /* set the user sid to be the calculated u_sid */
 738         pdb_set_user_sid(sampass, &u_sid, PDB_SET);
 739
 740         result = make_server_info(NULL);
 741         if (result == NULL) {
 742                 TALLOC_FREE(sampass);
 743                 return NT_STATUS_NO_MEMORY;
 744         }
 745
 746         status = samu_to_SamInfo3(result, sampass, lp_netbios_name(),
 747                                   &result->info3, &result->extra);
 748         TALLOC_FREE(sampass);
 749         if (!NT_STATUS_IS_OK(status)) {
 750                 DEBUG(10, ("Failed to convert samu to info3: %s\n",
 751                            nt_errstr(status)));
 752                 TALLOC_FREE(result);
 753                 return status;
 754         }
 755
 756         result->unix_name = talloc_strdup(result, unix_username);
 757
 758         if (result->unix_name == NULL) {
 759                 TALLOC_FREE(result);
 760                 return NT_STATUS_NO_MEMORY;
 761         }
 762
 763         result->utok.uid = pwd->pw_uid;
 764         result->utok.gid = pwd->pw_gid;
 765
 766         *server_info = result;
 767
 768         return NT_STATUS_OK;
 769 }
 770
 771 static NTSTATUS get_guest_info3(TALLOC_CTX *mem_ctx,
 772                                 struct netr_SamInfo3 *info3)
 773 {
 774         const char *guest_account = lp_guestaccount();
 775         struct dom_sid domain_sid;
 776         struct passwd *pwd;
 777         const char *tmp;
 778
 779         pwd = Get_Pwnam_alloc(mem_ctx, guest_account);
 780         if (pwd == NULL) {
 781                 DEBUG(0,("SamInfo3_for_guest: Unable to locate guest "
 782                          "account [%s]!\n", guest_account));
 783                 return NT_STATUS_NO_SUCH_USER;
 784         }
 785
 786         /* Set account name */
 787         tmp = talloc_strdup(mem_ctx, pwd->pw_name);
 788         if (tmp == NULL) {
 789                 return NT_STATUS_NO_MEMORY;
 790         }
 791         init_lsa_String(&info3->base.account_name, tmp);
 792
 793         /* Set domain name */
 794         tmp = talloc_strdup(mem_ctx, get_global_sam_name());
 795         if (tmp == NULL) {
 796                 return NT_STATUS_NO_MEMORY;
 797         }
 798         init_lsa_StringLarge(&info3->base.domain, tmp);
 799
 800         /* Domain sid */
 801         sid_copy(&domain_sid, get_global_sam_sid());
 802
 803         info3->base.domain_sid = dom_sid_dup(mem_ctx, &domain_sid);
 804         if (info3->base.domain_sid == NULL) {
 805                 return NT_STATUS_NO_MEMORY;
 806         }
 807
 808         /* Guest rid */
 809         info3->base.rid = DOMAIN_RID_GUEST;
 810
 811         /* Primary gid */
 812         info3->base.primary_gid = BUILTIN_RID_GUESTS;
 813
 814         /* Set as guest */
 815         info3->base.user_flags = NETLOGON_GUEST;
 816
 817         TALLOC_FREE(pwd);
 818         return NT_STATUS_OK;
 819 }
 820
 821 /***************************************************************************
 822  Make (and fill) a user_info struct for a guest login.
 823  This *must* succeed for smbd to start. If there is no mapping entry for
 824  the guest gid, then create one.
 825
 826  The resulting structure is a 'session_info' because
 827  create_local_token() has already been called on it.  This is quite
 828  nasty, as the auth subsystem isn't expect this, but the behavior is
 829  left as-is for now.
 830 ***************************************************************************/
 831
 832 static NTSTATUS make_new_session_info_guest(struct auth_session_info **session_info, struct auth_serversupplied_info **server_info)
 833 {
 834         static const char zeros[16] = {0};
 835         const char *guest_account = lp_guestaccount();
 836         const char *domain = lp_netbios_name();
 837         struct netr_SamInfo3 info3;
 838         TALLOC_CTX *tmp_ctx;
 839         NTSTATUS status;
 840
 841         tmp_ctx = talloc_stackframe();
 842         if (tmp_ctx == NULL) {
 843                 return NT_STATUS_NO_MEMORY;
 844         }
 845
 846         ZERO_STRUCT(info3);
 847
 848         status = get_guest_info3(tmp_ctx, &info3);
 849         if (!NT_STATUS_IS_OK(status)) {
 850                 DEBUG(0, ("get_guest_info3 failed with %s\n",
 851                           nt_errstr(status)));
 852                 goto done;
 853         }
 854
 855         status = make_server_info_info3(tmp_ctx,
 856                                         guest_account,
 857                                         domain,
 858                                         server_info,
 859                                         &info3);
 860         if (!NT_STATUS_IS_OK(status)) {
 861                 DEBUG(0, ("make_server_info_info3 failed with %s\n",
 862                           nt_errstr(status)));
 863                 goto done;
 864         }
 865
 866         (*server_info)->guest = true;
 867
 868         /* This should not be done here (we should produce a server
 869          * info, and later construct a session info from it), but for
 870          * now this does not change the previous behavior */
 871         status = create_local_token(tmp_ctx, *server_info, NULL,
 872                                     (*server_info)->info3->base.account_name.string,
 873                                     session_info);
 874         if (!NT_STATUS_IS_OK(status)) {
 875                 DEBUG(0, ("create_local_token failed: %s\n",
 876                           nt_errstr(status)));
 877                 goto done;
 878         }
 879         talloc_steal(NULL, *session_info);
 880         talloc_steal(NULL, *server_info);
 881
 882         /* annoying, but the Guest really does have a session key, and it is
 883            all zeros! */
 884         (*session_info)->session_key = data_blob(zeros, sizeof(zeros));
 885
 886         status = NT_STATUS_OK;
 887 done:
 888         TALLOC_FREE(tmp_ctx);
 889         return status;
 890 }
 891
 892 /***************************************************************************
 893  Make (and fill) a auth_session_info struct for a system user login.
 894  This *must* succeed for smbd to start.
 895 ***************************************************************************/
 896
 897 static NTSTATUS make_new_session_info_system(TALLOC_CTX *mem_ctx,
 898                                             struct auth_session_info **session_info)
 899 {
 900         struct passwd *pwd;
 901         NTSTATUS status;
 902
 903         pwd = getpwuid_alloc(mem_ctx, sec_initial_uid());
 904         if (pwd == NULL) {
 905                 return NT_STATUS_NO_SUCH_USER;
 906         }
 907
 908         status = make_session_info_from_username(mem_ctx,
 909                                                  pwd->pw_name,
 910                                                  false,
 911                                                  session_info);
 912         TALLOC_FREE(pwd);
 913         if (!NT_STATUS_IS_OK(status)) {
 914                 return status;
 915         }
 916
 917         (*session_info)->unix_info->system = true;
 918
 919         status = add_sid_to_array_unique((*session_info)->security_token->sids,
 920                                          &global_sid_System,
 921                                          &(*session_info)->security_token->sids,
 922                                          &(*session_info)->security_token->num_sids);
 923         if (!NT_STATUS_IS_OK(status)) {
 924                 TALLOC_FREE((*session_info));
 925                 return status;
 926         }
 927
 928         return NT_STATUS_OK;
 929 }
 930
 931 /****************************************************************************
 932   Fake a auth_session_info just from a username (as a
 933   session_info structure, with create_local_token() already called on
 934   it.
 935 ****************************************************************************/
 936
 937 NTSTATUS make_session_info_from_username(TALLOC_CTX *mem_ctx,
 938                                          const char *username,
 939                                          bool is_guest,
 940                                          struct auth_session_info **session_info)
 941 {
 942         struct auth_serversupplied_info *result;
 943         struct passwd *pwd;
 944         NTSTATUS status;
 945
 946         pwd = Get_Pwnam_alloc(talloc_tos(), username);
 947         if (pwd == NULL) {
 948                 return NT_STATUS_NO_SUCH_USER;
 949         }
 950
 951         status = make_server_info_pw(&result, pwd->pw_name, pwd);
 952
 953         if (!NT_STATUS_IS_OK(status)) {
 954                 TALLOC_FREE(pwd);
 955                 return status;
 956         }
 957
 958         result->nss_token = true;
 959         result->guest = is_guest;
 960
 961         /* Now turn the server_info into a session_info with the full token etc */
 962         status = create_local_token(mem_ctx, result, NULL, pwd->pw_name, session_info);
 963         TALLOC_FREE(pwd);
 964         talloc_free(result);
 965         return status;
 966 }
 967
 968 /* This function MUST only used to create the cached server_info for
 969  * guest.
 970  *
 971  * This is a lossy conversion.  Variables known to be lost so far
 972  * include:
 973  *
 974  * - nss_token (not needed because the only read doesn't happen
 975  * for the GUEST user, as this routine populates ->security_token
 976  *
 977  * - extra (not needed because the guest account must have valid RIDs per the output of get_guest_info3())
 978  *
 979  * - The 'server_info' parameter allows the missing 'info3' to be copied across.
 980  */
 981 static struct auth_serversupplied_info *copy_session_info_serverinfo_guest(TALLOC_CTX *mem_ctx,
 982                                                                            const struct auth_session_info *src,
 983                                                                            struct auth_serversupplied_info *server_info)
 984 {
 985         struct auth_serversupplied_info *dst;
 986
 987         dst = make_server_info(mem_ctx);
 988         if (dst == NULL) {
 989                 return NULL;
 990         }
 991
 992         /* This element must be provided to convert back to an auth_serversupplied_info */
 993         SMB_ASSERT(src->unix_info);
 994
 995         dst->guest = true;
 996         dst->system = false;
 997
 998         /* This element must be provided to convert back to an
 999          * auth_serversupplied_info.  This needs to be from the
1000          * auth_session_info because the group values in particular
1001          * may change during create_local_token() processing */
1002         SMB_ASSERT(src->unix_token);
1003         dst->utok.uid = src->unix_token->uid;
1004         dst->utok.gid = src->unix_token->gid;
1005         dst->utok.ngroups = src->unix_token->ngroups;
1006         if (src->unix_token->ngroups != 0) {
1007                 dst->utok.groups = (gid_t *)talloc_memdup(
1008                         dst, src->unix_token->groups,
1009                         sizeof(gid_t)*dst->utok.ngroups);
1010         } else {
1011                 dst->utok.groups = NULL;
1012         }
1013
1014         /* We must have a security_token as otherwise the lossy
1015          * conversion without nss_token would cause create_local_token
1016          * to take the wrong path */
1017         SMB_ASSERT(src->security_token);
1018
1019         dst->security_token = dup_nt_token(dst, src->security_token);
1020         if (!dst->security_token) {
1021                 TALLOC_FREE(dst);
1022                 return NULL;
1023         }
1024
1025         dst->session_key = data_blob_talloc( dst, src->session_key.data,
1026                                                 src->session_key.length);
1027
1028         /* This is OK because this functions is only used for the
1029          * GUEST account, which has all-zero keys for both values */
1030         dst->lm_session_key = data_blob_talloc(dst, src->session_key.data,
1031                                                 src->session_key.length);
1032
1033         dst->info3 = copy_netr_SamInfo3(dst, server_info->info3);
1034         if (!dst->info3) {
1035                 TALLOC_FREE(dst);
1036                 return NULL;
1037         }
1038
1039         dst->unix_name = talloc_strdup(dst, src->unix_info->unix_name);
1040         if (!dst->unix_name) {
1041                 TALLOC_FREE(dst);
1042                 return NULL;
1043         }
1044
1045         return dst;
1046 }
1047
1048 struct auth_session_info *copy_session_info(TALLOC_CTX *mem_ctx,
1049                                              const struct auth_session_info *src)
1050 {
1051         struct auth_session_info *dst;
1052         DATA_BLOB blob;
1053         enum ndr_err_code ndr_err;
1054
1055         ndr_err = ndr_push_struct_blob(
1056                 &blob, talloc_tos(), src,
1057                 (ndr_push_flags_fn_t)ndr_push_auth_session_info);
1058         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1059                 DEBUG(0, ("copy_session_info(): ndr_push_auth_session_info failed: "
1060                            "%s\n", ndr_errstr(ndr_err)));
1061                 return NULL;
1062         }
1063
1064         dst = talloc(mem_ctx, struct auth_session_info);
1065         if (dst == NULL) {
1066                 DEBUG(0, ("talloc failed\n"));
1067                 TALLOC_FREE(blob.data);
1068                 return NULL;
1069         }
1070
1071         ndr_err = ndr_pull_struct_blob(
1072                 &blob, dst, dst,
1073                 (ndr_pull_flags_fn_t)ndr_pull_auth_session_info);
1074         TALLOC_FREE(blob.data);
1075
1076         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1077                 DEBUG(0, ("copy_session_info(): ndr_pull_auth_session_info failed: "
1078                            "%s\n", ndr_errstr(ndr_err)));
1079                 TALLOC_FREE(dst);
1080                 return NULL;
1081         }
1082
1083         return dst;
1084 }
1085
1086 /*
1087  * Set a new session key. Used in the rpc server where we have to override the
1088  * SMB level session key with SystemLibraryDTC
1089  */
1090
1091 bool session_info_set_session_key(struct auth_session_info *info,
1092                                  DATA_BLOB session_key)
1093 {
1094         TALLOC_FREE(info->session_key.data);
1095
1096         info->session_key = data_blob_talloc(
1097                 info, session_key.data, session_key.length);
1098
1099         return (info->session_key.data != NULL);
1100 }
1101
1102 static struct auth_session_info *guest_info = NULL;
1103
1104 static struct auth_serversupplied_info *guest_server_info = NULL;
1105
1106 bool init_guest_info(void)
1107 {
1108         if (guest_info != NULL)
1109                 return true;
1110
1111         return NT_STATUS_IS_OK(make_new_session_info_guest(&guest_info, &guest_server_info));
1112 }
1113
1114 NTSTATUS make_server_info_guest(TALLOC_CTX *mem_ctx,
1115                                 struct auth_serversupplied_info **server_info)
1116 {
1117         /* This is trickier than it would appear to need to be because
1118          * we are trying to avoid certain costly operations when the
1119          * structure is converted to a 'auth_session_info' again in
1120          * create_local_token() */
1121         *server_info = copy_session_info_serverinfo_guest(mem_ctx, guest_info, guest_server_info);
1122         return (*server_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
1123 }
1124
1125 NTSTATUS make_session_info_guest(TALLOC_CTX *mem_ctx,
1126                                 struct auth_session_info **session_info)
1127 {
1128         *session_info = copy_session_info(mem_ctx, guest_info);
1129         return (*session_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
1130 }
1131
1132 static struct auth_session_info *system_info = NULL;
1133
1134 NTSTATUS init_system_info(void)
1135 {
1136         if (system_info != NULL)
1137                 return NT_STATUS_OK;
1138
1139         return make_new_session_info_system(NULL, &system_info);
1140 }
1141
1142 NTSTATUS make_session_info_system(TALLOC_CTX *mem_ctx,
1143                                 struct auth_session_info **session_info)
1144 {
1145         if (system_info == NULL) return NT_STATUS_UNSUCCESSFUL;
1146         *session_info = copy_session_info(mem_ctx, system_info);
1147         return (*session_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
1148 }
1149
1150 const struct auth_session_info *get_session_info_system(void)
1151 {
1152     return system_info;
1153 }
1154
1155 bool copy_current_user(struct current_user *dst, struct current_user *src)
1156 {
1157         gid_t *groups;
1158         struct security_token *nt_token;
1159
1160         groups = (gid_t *)memdup(src->ut.groups,
1161                                  sizeof(gid_t) * src->ut.ngroups);
1162         if ((src->ut.ngroups != 0) && (groups == NULL)) {
1163                 return false;
1164         }
1165
1166         nt_token = dup_nt_token(NULL, src->nt_user_token);
1167         if (nt_token == NULL) {
1168                 SAFE_FREE(groups);
1169                 return false;
1170         }
1171
1172         dst->conn = src->conn;
1173         dst->vuid = src->vuid;
1174         dst->ut.uid = src->ut.uid;
1175         dst->ut.gid = src->ut.gid;
1176         dst->ut.ngroups = src->ut.ngroups;
1177         dst->ut.groups = groups;
1178         dst->nt_user_token = nt_token;
1179         return true;
1180 }
1181
1182 /***************************************************************************
1183  Purely internal function for make_server_info_info3
1184 ***************************************************************************/
1185
1186 static NTSTATUS check_account(TALLOC_CTX *mem_ctx, const char *domain,
1187                               const char *username, char **found_username,
1188                               struct passwd **pwd,
1189                               bool *username_was_mapped)
1190 {
1191         char *orig_dom_user = NULL;
1192         char *dom_user = NULL;
1193         char *lower_username = NULL;
1194         char *real_username = NULL;
1195         struct passwd *passwd;
1196
1197         lower_username = talloc_strdup(mem_ctx, username);
1198         if (!lower_username) {
1199                 return NT_STATUS_NO_MEMORY;
1200         }
1201         strlower_m( lower_username );
1202
1203         orig_dom_user = talloc_asprintf(mem_ctx,
1204                                 "%s%c%s",
1205                                 domain,
1206                                 *lp_winbind_separator(),
1207                                 lower_username);
1208         if (!orig_dom_user) {
1209                 return NT_STATUS_NO_MEMORY;
1210         }
1211
1212         /* Get the passwd struct.  Try to create the account if necessary. */
1213
1214         *username_was_mapped = map_username(mem_ctx, orig_dom_user, &dom_user);
1215         if (!dom_user) {
1216                 return NT_STATUS_NO_MEMORY;
1217         }
1218
1219         passwd = smb_getpwnam(mem_ctx, dom_user, &real_username, true );
1220         if (!passwd) {
1221                 DEBUG(3, ("Failed to find authenticated user %s via "
1222                           "getpwnam(), denying access.\n", dom_user));
1223                 return NT_STATUS_NO_SUCH_USER;
1224         }
1225
1226         if (!real_username) {
1227                 return NT_STATUS_NO_MEMORY;
1228         }
1229
1230         *pwd = passwd;
1231
1232         /* This is pointless -- there is no support for differing
1233            unix and windows names.  Make sure to always store the
1234            one we actually looked up and succeeded. Have I mentioned
1235            why I hate the 'winbind use default domain' parameter?
1236                                          --jerry              */
1237
1238         *found_username = talloc_strdup( mem_ctx, real_username );
1239
1240         return NT_STATUS_OK;
1241 }
1242
1243 /****************************************************************************
1244  Wrapper to allow the getpwnam() call to strip the domain name and
1245  try again in case a local UNIX user is already there.  Also run through
1246  the username if we fallback to the username only.
1247  ****************************************************************************/
1248
1249 struct passwd *smb_getpwnam( TALLOC_CTX *mem_ctx, const char *domuser,
1250                              char **p_save_username, bool create )
1251 {
1252         struct passwd *pw = NULL;
1253         char *p = NULL;
1254         char *username = NULL;
1255
1256         /* we only save a copy of the username it has been mangled
1257            by winbindd use default domain */
1258         *p_save_username = NULL;
1259
1260         /* don't call map_username() here since it has to be done higher
1261            up the stack so we don't call it multiple times */
1262
1263         username = talloc_strdup(mem_ctx, domuser);
1264         if (!username) {
1265                 return NULL;
1266         }
1267
1268         p = strchr_m( username, *lp_winbind_separator() );
1269
1270         /* code for a DOMAIN\user string */
1271
1272         if ( p ) {
1273                 pw = Get_Pwnam_alloc( mem_ctx, domuser );
1274                 if ( pw ) {
1275                         /* make sure we get the case of the username correct */
1276                         /* work around 'winbind use default domain = yes' */
1277
1278                         if ( !strchr_m( pw->pw_name, *lp_winbind_separator() ) ) {
1279                                 char *domain;
1280
1281                                 /* split the domain and username into 2 strings */
1282                                 *p = '\0';
1283                                 domain = username;
1284
1285                                 *p_save_username = talloc_asprintf(mem_ctx,
1286                                                                 "%s%c%s",
1287                                                                 domain,
1288                                                                 *lp_winbind_separator(),
1289                                                                 pw->pw_name);
1290                                 if (!*p_save_username) {
1291                                         TALLOC_FREE(pw);
1292                                         return NULL;
1293                                 }
1294                         } else {
1295                                 *p_save_username = talloc_strdup(mem_ctx, pw->pw_name);
1296                         }
1297
1298                         /* whew -- done! */
1299                         return pw;
1300                 }
1301
1302                 /* setup for lookup of just the username */
1303                 /* remember that p and username are overlapping memory */
1304
1305                 p++;
1306                 username = talloc_strdup(mem_ctx, p);
1307                 if (!username) {
1308                         return NULL;
1309                 }
1310         }
1311
1312         /* just lookup a plain username */
1313
1314         pw = Get_Pwnam_alloc(mem_ctx, username);
1315
1316         /* Create local user if requested but only if winbindd
1317            is not running.  We need to protect against cases
1318            where winbindd is failing and then prematurely
1319            creating users in /etc/passwd */
1320
1321         if ( !pw && create && !winbind_ping() ) {
1322                 /* Don't add a machine account. */
1323                 if (username[strlen(username)-1] == '$')
1324                         return NULL;
1325
1326                 _smb_create_user(NULL, username, NULL);
1327                 pw = Get_Pwnam_alloc(mem_ctx, username);
1328         }
1329
1330         /* one last check for a valid passwd struct */
1331
1332         if (pw) {
1333                 *p_save_username = talloc_strdup(mem_ctx, pw->pw_name);
1334         }
1335         return pw;
1336 }
1337
1338 /***************************************************************************
1339  Make a server_info struct from the info3 returned by a domain logon
1340 ***************************************************************************/
1341
1342 NTSTATUS make_server_info_info3(TALLOC_CTX *mem_ctx,
1343                                 const char *sent_nt_username,
1344                                 const char *domain,
1345                                 struct auth_serversupplied_info **server_info,
1346                                 struct netr_SamInfo3 *info3)
1347 {
1348         static const char zeros[16] = {0, };
1349
1350         NTSTATUS nt_status = NT_STATUS_OK;
1351         char *found_username = NULL;
1352         const char *nt_domain;
1353         const char *nt_username;
1354         bool username_was_mapped;
1355         struct passwd *pwd;
1356         struct auth_serversupplied_info *result;
1357         struct dom_sid *group_sid;
1358         struct netr_SamInfo3 *i3;
1359
1360         /*
1361            Here is where we should check the list of
1362            trusted domains, and verify that the SID
1363            matches.
1364         */
1365
1366         nt_username = talloc_strdup(mem_ctx, info3->base.account_name.string);
1367         if (!nt_username) {
1368                 /* If the server didn't give us one, just use the one we sent
1369                  * them */
1370                 nt_username = sent_nt_username;
1371         }
1372
1373         nt_domain = talloc_strdup(mem_ctx, info3->base.domain.string);
1374         if (!nt_domain) {
1375                 /* If the server didn't give us one, just use the one we sent
1376                  * them */
1377                 nt_domain = domain;
1378         }
1379
1380         /* If getpwnam() fails try the add user script (2.2.x behavior).
1381
1382            We use the _unmapped_ username here in an attempt to provide
1383            consistent username mapping behavior between kerberos and NTLM[SSP]
1384            authentication in domain mode security.  I.E. Username mapping
1385            should be applied to the fully qualified username
1386            (e.g. DOMAIN\user) and not just the login name.  Yes this means we
1387            called map_username() unnecessarily in make_user_info_map() but
1388            that is how the current code is designed.  Making the change here
1389            is the least disruptive place.  -- jerry */
1390
1391         /* this call will try to create the user if necessary */
1392
1393         nt_status = check_account(mem_ctx, nt_domain, sent_nt_username,
1394                                      &found_username, &pwd,
1395                                      &username_was_mapped);
1396
1397         if (!NT_STATUS_IS_OK(nt_status)) {
1398                 return nt_status;
1399         }
1400
1401         result = make_server_info(NULL);
1402         if (result == NULL) {
1403                 DEBUG(4, ("make_server_info failed!\n"));
1404                 return NT_STATUS_NO_MEMORY;
1405         }
1406
1407         result->unix_name = talloc_strdup(result, found_username);
1408
1409         /* copy in the info3 */
1410         result->info3 = i3 = copy_netr_SamInfo3(result, info3);
1411         if (result->info3 == NULL) {
1412                 TALLOC_FREE(result);
1413                 return NT_STATUS_NO_MEMORY;
1414         }
1415
1416         /* Fill in the unix info we found on the way */
1417         result->utok.uid = pwd->pw_uid;
1418         result->utok.gid = pwd->pw_gid;
1419
1420         /* We can't just trust that the primary group sid sent us is something
1421          * we can really use. Obtain the usable sid, and store the original
1422          * one as an additional group if it had to be replaced */
1423         nt_status = get_primary_group_sid(mem_ctx, found_username,
1424                                           &pwd, &group_sid);
1425         if (!NT_STATUS_IS_OK(nt_status)) {
1426                 TALLOC_FREE(result);
1427                 return nt_status;
1428         }
1429
1430         /* store and check if it is the same we got originally */
1431         sid_peek_rid(group_sid, &i3->base.primary_gid);
1432         if (i3->base.primary_gid != info3->base.primary_gid) {
1433                 uint32_t n = i3->base.groups.count;
1434                 /* not the same, store the original as an additional group */
1435                 i3->base.groups.rids =
1436                         talloc_realloc(i3, i3->base.groups.rids,
1437                                         struct samr_RidWithAttribute, n + 1);
1438                 if (i3->base.groups.rids == NULL) {
1439                         TALLOC_FREE(result);
1440                         return NT_STATUS_NO_MEMORY;
1441                 }
1442                 i3->base.groups.rids[n].rid = info3->base.primary_gid;
1443                 i3->base.groups.rids[n].attributes = SE_GROUP_ENABLED;
1444                 i3->base.groups.count = n + 1;
1445         }
1446
1447         /* ensure we are never given NULL session keys */
1448
1449         if (memcmp(info3->base.key.key, zeros, sizeof(zeros)) == 0) {
1450                 result->session_key = data_blob_null;
1451         } else {
1452                 result->session_key = data_blob_talloc(
1453                         result, info3->base.key.key,
1454                         sizeof(info3->base.key.key));
1455         }
1456
1457         if (memcmp(info3->base.LMSessKey.key, zeros, 8) == 0) {
1458                 result->lm_session_key = data_blob_null;
1459         } else {
1460                 result->lm_session_key = data_blob_talloc(
1461                         result, info3->base.LMSessKey.key,
1462                         sizeof(info3->base.LMSessKey.key));
1463         }
1464
1465         result->nss_token |= username_was_mapped;
1466
1467         result->guest = (info3->base.user_flags & NETLOGON_GUEST);
1468
1469         *server_info = result;
1470
1471         return NT_STATUS_OK;
1472 }
1473
1474 /*****************************************************************************
1475  Make a server_info struct from the wbcAuthUserInfo returned by a domain logon
1476 ******************************************************************************/
1477
1478 NTSTATUS make_server_info_wbcAuthUserInfo(TALLOC_CTX *mem_ctx,
1479                                           const char *sent_nt_username,
1480                                           const char *domain,
1481                                           const struct wbcAuthUserInfo *info,
1482                                           struct auth_serversupplied_info **server_info)
1483 {
1484         struct netr_SamInfo3 *info3;
1485
1486         info3 = wbcAuthUserInfo_to_netr_SamInfo3(mem_ctx, info);
1487         if (!info3) {
1488                 return NT_STATUS_NO_MEMORY;
1489         }
1490
1491         return make_server_info_info3(mem_ctx,
1492                                       sent_nt_username, domain,
1493                                       server_info, info3);
1494 }
1495
1496 /**
1497  * Verify whether or not given domain is trusted.
1498  *
1499  * @param domain_name name of the domain to be verified
1500  * @return true if domain is one of the trusted ones or
1501  *         false if otherwise
1502  **/
1503
1504 bool is_trusted_domain(const char* dom_name)
1505 {
1506         struct dom_sid trustdom_sid;
1507         bool ret;
1508
1509         /* no trusted domains for a standalone server */
1510
1511         if ( lp_server_role() == ROLE_STANDALONE )
1512                 return false;
1513
1514         if (dom_name == NULL || dom_name[0] == '\0') {
1515                 return false;
1516         }
1517
1518         if (strequal(dom_name, get_global_sam_name())) {
1519                 return false;
1520         }
1521
1522         /* if we are a DC, then check for a direct trust relationships */
1523
1524         if ( IS_DC ) {
1525                 become_root();
1526                 DEBUG (5,("is_trusted_domain: Checking for domain trust with "
1527                           "[%s]\n", dom_name ));
1528                 ret = pdb_get_trusteddom_pw(dom_name, NULL, NULL, NULL);
1529                 unbecome_root();
1530                 if (ret)
1531                         return true;
1532         }
1533         else {
1534                 wbcErr result;
1535
1536                 /* If winbind is around, ask it */
1537
1538                 result = wb_is_trusted_domain(dom_name);
1539
1540                 if (result == WBC_ERR_SUCCESS) {
1541                         return true;
1542                 }
1543
1544                 if (result == WBC_ERR_DOMAIN_NOT_FOUND) {
1545                         /* winbind could not find the domain */
1546                         return false;
1547                 }
1548
1549                 /* The only other possible result is that winbind is not up
1550                    and running. We need to update the trustdom_cache
1551                    ourselves */
1552
1553                 update_trustdom_cache();
1554         }
1555
1556         /* now the trustdom cache should be available a DC could still
1557          * have a transitive trust so fall back to the cache of trusted
1558          * domains (like a domain member would use  */
1559
1560         if ( trustdom_cache_fetch(dom_name, &trustdom_sid) ) {
1561                 return true;
1562         }
1563
1564         return false;
1565 }
1566
1567
1568
1569 /*
1570   on a logon error possibly map the error to success if "map to guest"
1571   is set approriately
1572 */
1573 NTSTATUS do_map_to_guest_server_info(NTSTATUS status,
1574                                      struct auth_serversupplied_info **server_info,
1575                                      const char *user, const char *domain)
1576 {
1577         user = user ? user : "";
1578         domain = domain ? domain : "";
1579
1580         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
1581                 if ((lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_USER) ||
1582                     (lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_PASSWORD)) {
1583                         DEBUG(3,("No such user %s [%s] - using guest account\n",
1584                                  user, domain));
1585                         return make_server_info_guest(NULL, server_info);
1586                 }
1587         } else if (NT_STATUS_EQUAL(status, NT_STATUS_WRONG_PASSWORD)) {
1588                 if (lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_PASSWORD) {
1589                         DEBUG(3,("Registered username %s for guest access\n",
1590                                 user));
1591                         return make_server_info_guest(NULL, server_info);
1592                 }
1593         }
1594
1595         return status;
1596 }