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         for (i=0; i<t->num_sids; i++) {
 608
 609                 if (i == 0 && ids[i].type != WBC_ID_TYPE_BOTH) {
 610                         continue;
 611                 }
 612
 613                 if (ids[i].type != WBC_ID_TYPE_GID &&
 614                     ids[i].type != WBC_ID_TYPE_BOTH) {
 615                         DEBUG(10, ("Could not convert SID %s to gid, "
 616                                    "ignoring it\n",
 617                                    sid_string_dbg(&t->sids[i])));
 618                         continue;
 619                 }
 620                 if (!add_gid_to_array_unique(session_info, ids[i].id.gid,
 621                                              &session_info->unix_token->groups,
 622                                              &session_info->unix_token->ngroups)) {
 623                         return NT_STATUS_NO_MEMORY;
 624                 }
 625         }
 626
 627         /*
 628          * Add the "Unix Group" SID for each gid to catch mapped groups
 629          * and their Unix equivalent.  This is to solve the backwards
 630          * compatibility problem of 'valid users = +ntadmin' where
 631          * ntadmin has been paired with "Domain Admins" in the group
 632          * mapping table.  Otherwise smb.conf would need to be changed
 633          * to 'valid user = "Domain Admins"'.  --jerry
 634          *
 635          * For consistency we also add the "Unix User" SID,
 636          * so that the complete unix token is represented within
 637          * the nt token.
 638          */
 639
 640         uid_to_unix_users_sid(session_info->unix_token->uid, &tmp_sid);
 641
 642         add_sid_to_array_unique(session_info->security_token, &tmp_sid,
 643                                 &session_info->security_token->sids,
 644                                 &session_info->security_token->num_sids);
 645
 646         for ( i=0; i<session_info->unix_token->ngroups; i++ ) {
 647                 gid_to_unix_groups_sid(session_info->unix_token->groups[i], &tmp_sid);
 648                 add_sid_to_array_unique(session_info->security_token, &tmp_sid,
 649                                         &session_info->security_token->sids,
 650                                         &session_info->security_token->num_sids);
 651         }
 652
 653         security_token_debug(DBGC_AUTH, 10, session_info->security_token);
 654         debug_unix_user_token(DBGC_AUTH, 10,
 655                               session_info->unix_token->uid,
 656                               session_info->unix_token->gid,
 657                               session_info->unix_token->ngroups,
 658                               session_info->unix_token->groups);
 659
 660         status = log_nt_token(session_info->security_token);
 661         if (!NT_STATUS_IS_OK(status)) {
 662                 return status;
 663         }
 664
 665         *session_info_out = session_info;
 666         return NT_STATUS_OK;
 667 }
 668
 669 /***************************************************************************
 670  Make (and fill) a server_info struct from a 'struct passwd' by conversion
 671  to a struct samu
 672 ***************************************************************************/
 673
 674 NTSTATUS make_server_info_pw(struct auth_serversupplied_info **server_info,
 675                              char *unix_username,
 676                              struct passwd *pwd)
 677 {
 678         NTSTATUS status;
 679         struct samu *sampass = NULL;
 680         char *qualified_name = NULL;
 681         TALLOC_CTX *mem_ctx = NULL;
 682         struct dom_sid u_sid;
 683         enum lsa_SidType type;
 684         struct auth_serversupplied_info *result;
 685
 686         /*
 687          * The SID returned in server_info->sam_account is based
 688          * on our SAM sid even though for a pure UNIX account this should
 689          * not be the case as it doesn't really exist in the SAM db.
 690          * This causes lookups on "[in]valid users" to fail as they
 691          * will lookup this name as a "Unix User" SID to check against
 692          * the user token. Fix this by adding the "Unix User"\unix_username
 693          * SID to the sid array. The correct fix should probably be
 694          * changing the server_info->sam_account user SID to be a
 695          * S-1-22 Unix SID, but this might break old configs where
 696          * plaintext passwords were used with no SAM backend.
 697          */
 698
 699         mem_ctx = talloc_init("make_server_info_pw_tmp");
 700         if (!mem_ctx) {
 701                 return NT_STATUS_NO_MEMORY;
 702         }
 703
 704         qualified_name = talloc_asprintf(mem_ctx, "%s\\%s",
 705                                         unix_users_domain_name(),
 706                                         unix_username );
 707         if (!qualified_name) {
 708                 TALLOC_FREE(mem_ctx);
 709                 return NT_STATUS_NO_MEMORY;
 710         }
 711
 712         if (!lookup_name(mem_ctx, qualified_name, LOOKUP_NAME_ALL,
 713                                                 NULL, NULL,
 714                                                 &u_sid, &type)) {
 715                 TALLOC_FREE(mem_ctx);
 716                 return NT_STATUS_NO_SUCH_USER;
 717         }
 718
 719         TALLOC_FREE(mem_ctx);
 720
 721         if (type != SID_NAME_USER) {
 722                 return NT_STATUS_NO_SUCH_USER;
 723         }
 724
 725         if ( !(sampass = samu_new( NULL )) ) {
 726                 return NT_STATUS_NO_MEMORY;
 727         }
 728
 729         status = samu_set_unix( sampass, pwd );
 730         if (!NT_STATUS_IS_OK(status)) {
 731                 return status;
 732         }
 733
 734         /* In pathological cases the above call can set the account
 735          * name to the DOMAIN\username form. Reset the account name
 736          * using unix_username */
 737         pdb_set_username(sampass, unix_username, PDB_SET);
 738
 739         /* set the user sid to be the calculated u_sid */
 740         pdb_set_user_sid(sampass, &u_sid, PDB_SET);
 741
 742         result = make_server_info(NULL);
 743         if (result == NULL) {
 744                 TALLOC_FREE(sampass);
 745                 return NT_STATUS_NO_MEMORY;
 746         }
 747
 748         status = samu_to_SamInfo3(result, sampass, lp_netbios_name(),
 749                                   &result->info3, &result->extra);
 750         TALLOC_FREE(sampass);
 751         if (!NT_STATUS_IS_OK(status)) {
 752                 DEBUG(10, ("Failed to convert samu to info3: %s\n",
 753                            nt_errstr(status)));
 754                 TALLOC_FREE(result);
 755                 return status;
 756         }
 757
 758         result->unix_name = talloc_strdup(result, unix_username);
 759
 760         if (result->unix_name == NULL) {
 761                 TALLOC_FREE(result);
 762                 return NT_STATUS_NO_MEMORY;
 763         }
 764
 765         result->utok.uid = pwd->pw_uid;
 766         result->utok.gid = pwd->pw_gid;
 767
 768         *server_info = result;
 769
 770         return NT_STATUS_OK;
 771 }
 772
 773 static NTSTATUS get_guest_info3(TALLOC_CTX *mem_ctx,
 774                                 struct netr_SamInfo3 *info3)
 775 {
 776         const char *guest_account = lp_guestaccount();
 777         struct dom_sid domain_sid;
 778         struct passwd *pwd;
 779         const char *tmp;
 780
 781         pwd = Get_Pwnam_alloc(mem_ctx, guest_account);
 782         if (pwd == NULL) {
 783                 DEBUG(0,("SamInfo3_for_guest: Unable to locate guest "
 784                          "account [%s]!\n", guest_account));
 785                 return NT_STATUS_NO_SUCH_USER;
 786         }
 787
 788         /* Set account name */
 789         tmp = talloc_strdup(mem_ctx, pwd->pw_name);
 790         if (tmp == NULL) {
 791                 return NT_STATUS_NO_MEMORY;
 792         }
 793         init_lsa_String(&info3->base.account_name, tmp);
 794
 795         /* Set domain name */
 796         tmp = talloc_strdup(mem_ctx, get_global_sam_name());
 797         if (tmp == NULL) {
 798                 return NT_STATUS_NO_MEMORY;
 799         }
 800         init_lsa_StringLarge(&info3->base.domain, tmp);
 801
 802         /* Domain sid */
 803         sid_copy(&domain_sid, get_global_sam_sid());
 804
 805         info3->base.domain_sid = dom_sid_dup(mem_ctx, &domain_sid);
 806         if (info3->base.domain_sid == NULL) {
 807                 return NT_STATUS_NO_MEMORY;
 808         }
 809
 810         /* Guest rid */
 811         info3->base.rid = DOMAIN_RID_GUEST;
 812
 813         /* Primary gid */
 814         info3->base.primary_gid = BUILTIN_RID_GUESTS;
 815
 816         /* Set as guest */
 817         info3->base.user_flags = NETLOGON_GUEST;
 818
 819         TALLOC_FREE(pwd);
 820         return NT_STATUS_OK;
 821 }
 822
 823 /***************************************************************************
 824  Make (and fill) a user_info struct for a guest login.
 825  This *must* succeed for smbd to start. If there is no mapping entry for
 826  the guest gid, then create one.
 827
 828  The resulting structure is a 'session_info' because
 829  create_local_token() has already been called on it.  This is quite
 830  nasty, as the auth subsystem isn't expect this, but the behavior is
 831  left as-is for now.
 832 ***************************************************************************/
 833
 834 static NTSTATUS make_new_session_info_guest(struct auth_session_info **session_info, struct auth_serversupplied_info **server_info)
 835 {
 836         static const char zeros[16] = {0};
 837         const char *guest_account = lp_guestaccount();
 838         const char *domain = lp_netbios_name();
 839         struct netr_SamInfo3 info3;
 840         TALLOC_CTX *tmp_ctx;
 841         NTSTATUS status;
 842
 843         tmp_ctx = talloc_stackframe();
 844         if (tmp_ctx == NULL) {
 845                 return NT_STATUS_NO_MEMORY;
 846         }
 847
 848         ZERO_STRUCT(info3);
 849
 850         status = get_guest_info3(tmp_ctx, &info3);
 851         if (!NT_STATUS_IS_OK(status)) {
 852                 DEBUG(0, ("get_guest_info3 failed with %s\n",
 853                           nt_errstr(status)));
 854                 goto done;
 855         }
 856
 857         status = make_server_info_info3(tmp_ctx,
 858                                         guest_account,
 859                                         domain,
 860                                         server_info,
 861                                         &info3);
 862         if (!NT_STATUS_IS_OK(status)) {
 863                 DEBUG(0, ("make_server_info_info3 failed with %s\n",
 864                           nt_errstr(status)));
 865                 goto done;
 866         }
 867
 868         (*server_info)->guest = true;
 869
 870         /* This should not be done here (we should produce a server
 871          * info, and later construct a session info from it), but for
 872          * now this does not change the previous behavior */
 873         status = create_local_token(tmp_ctx, *server_info, NULL,
 874                                     (*server_info)->info3->base.account_name.string,
 875                                     session_info);
 876         if (!NT_STATUS_IS_OK(status)) {
 877                 DEBUG(0, ("create_local_token failed: %s\n",
 878                           nt_errstr(status)));
 879                 goto done;
 880         }
 881         talloc_steal(NULL, *session_info);
 882         talloc_steal(NULL, *server_info);
 883
 884         /* annoying, but the Guest really does have a session key, and it is
 885            all zeros! */
 886         (*session_info)->session_key = data_blob(zeros, sizeof(zeros));
 887
 888         status = NT_STATUS_OK;
 889 done:
 890         TALLOC_FREE(tmp_ctx);
 891         return status;
 892 }
 893
 894 /***************************************************************************
 895  Make (and fill) a auth_session_info struct for a system user login.
 896  This *must* succeed for smbd to start.
 897 ***************************************************************************/
 898
 899 static NTSTATUS make_new_session_info_system(TALLOC_CTX *mem_ctx,
 900                                             struct auth_session_info **session_info)
 901 {
 902         struct passwd *pwd;
 903         NTSTATUS status;
 904
 905         pwd = getpwuid_alloc(mem_ctx, sec_initial_uid());
 906         if (pwd == NULL) {
 907                 return NT_STATUS_NO_SUCH_USER;
 908         }
 909
 910         status = make_session_info_from_username(mem_ctx,
 911                                                  pwd->pw_name,
 912                                                  false,
 913                                                  session_info);
 914         TALLOC_FREE(pwd);
 915         if (!NT_STATUS_IS_OK(status)) {
 916                 return status;
 917         }
 918
 919         (*session_info)->unix_info->system = true;
 920
 921         status = add_sid_to_array_unique((*session_info)->security_token->sids,
 922                                          &global_sid_System,
 923                                          &(*session_info)->security_token->sids,
 924                                          &(*session_info)->security_token->num_sids);
 925         if (!NT_STATUS_IS_OK(status)) {
 926                 TALLOC_FREE((*session_info));
 927                 return status;
 928         }
 929
 930         return NT_STATUS_OK;
 931 }
 932
 933 /****************************************************************************
 934   Fake a auth_session_info just from a username (as a
 935   session_info structure, with create_local_token() already called on
 936   it.
 937 ****************************************************************************/
 938
 939 NTSTATUS make_session_info_from_username(TALLOC_CTX *mem_ctx,
 940                                          const char *username,
 941                                          bool is_guest,
 942                                          struct auth_session_info **session_info)
 943 {
 944         struct auth_serversupplied_info *result;
 945         struct passwd *pwd;
 946         NTSTATUS status;
 947
 948         pwd = Get_Pwnam_alloc(talloc_tos(), username);
 949         if (pwd == NULL) {
 950                 return NT_STATUS_NO_SUCH_USER;
 951         }
 952
 953         status = make_server_info_pw(&result, pwd->pw_name, pwd);
 954
 955         if (!NT_STATUS_IS_OK(status)) {
 956                 TALLOC_FREE(pwd);
 957                 return status;
 958         }
 959
 960         result->nss_token = true;
 961         result->guest = is_guest;
 962
 963         /* Now turn the server_info into a session_info with the full token etc */
 964         status = create_local_token(mem_ctx, result, NULL, pwd->pw_name, session_info);
 965         TALLOC_FREE(pwd);
 966         talloc_free(result);
 967         return status;
 968 }
 969
 970 /* This function MUST only used to create the cached server_info for
 971  * guest.
 972  *
 973  * This is a lossy conversion.  Variables known to be lost so far
 974  * include:
 975  *
 976  * - nss_token (not needed because the only read doesn't happen
 977  * for the GUEST user, as this routine populates ->security_token
 978  *
 979  * - extra (not needed because the guest account must have valid RIDs per the output of get_guest_info3())
 980  *
 981  * - The 'server_info' parameter allows the missing 'info3' to be copied across.
 982  */
 983 static struct auth_serversupplied_info *copy_session_info_serverinfo_guest(TALLOC_CTX *mem_ctx,
 984                                                                            const struct auth_session_info *src,
 985                                                                            struct auth_serversupplied_info *server_info)
 986 {
 987         struct auth_serversupplied_info *dst;
 988
 989         dst = make_server_info(mem_ctx);
 990         if (dst == NULL) {
 991                 return NULL;
 992         }
 993
 994         /* This element must be provided to convert back to an auth_serversupplied_info */
 995         SMB_ASSERT(src->unix_info);
 996
 997         dst->guest = true;
 998         dst->system = false;
 999
1000         /* This element must be provided to convert back to an
1001          * auth_serversupplied_info.  This needs to be from the
1002          * auth_session_info because the group values in particular
1003          * may change during create_local_token() processing */
1004         SMB_ASSERT(src->unix_token);
1005         dst->utok.uid = src->unix_token->uid;
1006         dst->utok.gid = src->unix_token->gid;
1007         dst->utok.ngroups = src->unix_token->ngroups;
1008         if (src->unix_token->ngroups != 0) {
1009                 dst->utok.groups = (gid_t *)talloc_memdup(
1010                         dst, src->unix_token->groups,
1011                         sizeof(gid_t)*dst->utok.ngroups);
1012         } else {
1013                 dst->utok.groups = NULL;
1014         }
1015
1016         /* We must have a security_token as otherwise the lossy
1017          * conversion without nss_token would cause create_local_token
1018          * to take the wrong path */
1019         SMB_ASSERT(src->security_token);
1020
1021         dst->security_token = dup_nt_token(dst, src->security_token);
1022         if (!dst->security_token) {
1023                 TALLOC_FREE(dst);
1024                 return NULL;
1025         }
1026
1027         dst->session_key = data_blob_talloc( dst, src->session_key.data,
1028                                                 src->session_key.length);
1029
1030         /* This is OK because this functions is only used for the
1031          * GUEST account, which has all-zero keys for both values */
1032         dst->lm_session_key = data_blob_talloc(dst, src->session_key.data,
1033                                                 src->session_key.length);
1034
1035         dst->info3 = copy_netr_SamInfo3(dst, server_info->info3);
1036         if (!dst->info3) {
1037                 TALLOC_FREE(dst);
1038                 return NULL;
1039         }
1040
1041         dst->unix_name = talloc_strdup(dst, src->unix_info->unix_name);
1042         if (!dst->unix_name) {
1043                 TALLOC_FREE(dst);
1044                 return NULL;
1045         }
1046
1047         return dst;
1048 }
1049
1050 struct auth_session_info *copy_session_info(TALLOC_CTX *mem_ctx,
1051                                              const struct auth_session_info *src)
1052 {
1053         struct auth_session_info *dst;
1054         DATA_BLOB blob;
1055         enum ndr_err_code ndr_err;
1056
1057         ndr_err = ndr_push_struct_blob(
1058                 &blob, talloc_tos(), src,
1059                 (ndr_push_flags_fn_t)ndr_push_auth_session_info);
1060         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1061                 DEBUG(0, ("copy_session_info(): ndr_push_auth_session_info failed: "
1062                            "%s\n", ndr_errstr(ndr_err)));
1063                 return NULL;
1064         }
1065
1066         dst = talloc(mem_ctx, struct auth_session_info);
1067         if (dst == NULL) {
1068                 DEBUG(0, ("talloc failed\n"));
1069                 TALLOC_FREE(blob.data);
1070                 return NULL;
1071         }
1072
1073         ndr_err = ndr_pull_struct_blob(
1074                 &blob, dst, dst,
1075                 (ndr_pull_flags_fn_t)ndr_pull_auth_session_info);
1076         TALLOC_FREE(blob.data);
1077
1078         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1079                 DEBUG(0, ("copy_session_info(): ndr_pull_auth_session_info failed: "
1080                            "%s\n", ndr_errstr(ndr_err)));
1081                 TALLOC_FREE(dst);
1082                 return NULL;
1083         }
1084
1085         return dst;
1086 }
1087
1088 /*
1089  * Set a new session key. Used in the rpc server where we have to override the
1090  * SMB level session key with SystemLibraryDTC
1091  */
1092
1093 bool session_info_set_session_key(struct auth_session_info *info,
1094                                  DATA_BLOB session_key)
1095 {
1096         TALLOC_FREE(info->session_key.data);
1097
1098         info->session_key = data_blob_talloc(
1099                 info, session_key.data, session_key.length);
1100
1101         return (info->session_key.data != NULL);
1102 }
1103
1104 static struct auth_session_info *guest_info = NULL;
1105
1106 static struct auth_serversupplied_info *guest_server_info = NULL;
1107
1108 bool init_guest_info(void)
1109 {
1110         if (guest_info != NULL)
1111                 return true;
1112
1113         return NT_STATUS_IS_OK(make_new_session_info_guest(&guest_info, &guest_server_info));
1114 }
1115
1116 NTSTATUS make_server_info_guest(TALLOC_CTX *mem_ctx,
1117                                 struct auth_serversupplied_info **server_info)
1118 {
1119         /* This is trickier than it would appear to need to be because
1120          * we are trying to avoid certain costly operations when the
1121          * structure is converted to a 'auth_session_info' again in
1122          * create_local_token() */
1123         *server_info = copy_session_info_serverinfo_guest(mem_ctx, guest_info, guest_server_info);
1124         return (*server_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
1125 }
1126
1127 NTSTATUS make_session_info_guest(TALLOC_CTX *mem_ctx,
1128                                 struct auth_session_info **session_info)
1129 {
1130         *session_info = copy_session_info(mem_ctx, guest_info);
1131         return (*session_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
1132 }
1133
1134 static struct auth_session_info *system_info = NULL;
1135
1136 NTSTATUS init_system_info(void)
1137 {
1138         if (system_info != NULL)
1139                 return NT_STATUS_OK;
1140
1141         return make_new_session_info_system(NULL, &system_info);
1142 }
1143
1144 NTSTATUS make_session_info_system(TALLOC_CTX *mem_ctx,
1145                                 struct auth_session_info **session_info)
1146 {
1147         if (system_info == NULL) return NT_STATUS_UNSUCCESSFUL;
1148         *session_info = copy_session_info(mem_ctx, system_info);
1149         return (*session_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
1150 }
1151
1152 const struct auth_session_info *get_session_info_system(void)
1153 {
1154     return system_info;
1155 }
1156
1157 bool copy_current_user(struct current_user *dst, struct current_user *src)
1158 {
1159         gid_t *groups;
1160         struct security_token *nt_token;
1161
1162         groups = (gid_t *)memdup(src->ut.groups,
1163                                  sizeof(gid_t) * src->ut.ngroups);
1164         if ((src->ut.ngroups != 0) && (groups == NULL)) {
1165                 return false;
1166         }
1167
1168         nt_token = dup_nt_token(NULL, src->nt_user_token);
1169         if (nt_token == NULL) {
1170                 SAFE_FREE(groups);
1171                 return false;
1172         }
1173
1174         dst->conn = src->conn;
1175         dst->vuid = src->vuid;
1176         dst->ut.uid = src->ut.uid;
1177         dst->ut.gid = src->ut.gid;
1178         dst->ut.ngroups = src->ut.ngroups;
1179         dst->ut.groups = groups;
1180         dst->nt_user_token = nt_token;
1181         return true;
1182 }
1183
1184 /***************************************************************************
1185  Purely internal function for make_server_info_info3
1186 ***************************************************************************/
1187
1188 static NTSTATUS check_account(TALLOC_CTX *mem_ctx, const char *domain,
1189                               const char *username, char **found_username,
1190                               struct passwd **pwd,
1191                               bool *username_was_mapped)
1192 {
1193         char *orig_dom_user = NULL;
1194         char *dom_user = NULL;
1195         char *lower_username = NULL;
1196         char *real_username = NULL;
1197         struct passwd *passwd;
1198
1199         lower_username = talloc_strdup(mem_ctx, username);
1200         if (!lower_username) {
1201                 return NT_STATUS_NO_MEMORY;
1202         }
1203         strlower_m( lower_username );
1204
1205         orig_dom_user = talloc_asprintf(mem_ctx,
1206                                 "%s%c%s",
1207                                 domain,
1208                                 *lp_winbind_separator(),
1209                                 lower_username);
1210         if (!orig_dom_user) {
1211                 return NT_STATUS_NO_MEMORY;
1212         }
1213
1214         /* Get the passwd struct.  Try to create the account if necessary. */
1215
1216         *username_was_mapped = map_username(mem_ctx, orig_dom_user, &dom_user);
1217         if (!dom_user) {
1218                 return NT_STATUS_NO_MEMORY;
1219         }
1220
1221         passwd = smb_getpwnam(mem_ctx, dom_user, &real_username, true );
1222         if (!passwd) {
1223                 DEBUG(3, ("Failed to find authenticated user %s via "
1224                           "getpwnam(), denying access.\n", dom_user));
1225                 return NT_STATUS_NO_SUCH_USER;
1226         }
1227
1228         if (!real_username) {
1229                 return NT_STATUS_NO_MEMORY;
1230         }
1231
1232         *pwd = passwd;
1233
1234         /* This is pointless -- there is no support for differing
1235            unix and windows names.  Make sure to always store the
1236            one we actually looked up and succeeded. Have I mentioned
1237            why I hate the 'winbind use default domain' parameter?
1238                                          --jerry              */
1239
1240         *found_username = talloc_strdup( mem_ctx, real_username );
1241
1242         return NT_STATUS_OK;
1243 }
1244
1245 /****************************************************************************
1246  Wrapper to allow the getpwnam() call to strip the domain name and
1247  try again in case a local UNIX user is already there.  Also run through
1248  the username if we fallback to the username only.
1249  ****************************************************************************/
1250
1251 struct passwd *smb_getpwnam( TALLOC_CTX *mem_ctx, const char *domuser,
1252                              char **p_save_username, bool create )
1253 {
1254         struct passwd *pw = NULL;
1255         char *p = NULL;
1256         char *username = NULL;
1257
1258         /* we only save a copy of the username it has been mangled
1259            by winbindd use default domain */
1260         *p_save_username = NULL;
1261
1262         /* don't call map_username() here since it has to be done higher
1263            up the stack so we don't call it multiple times */
1264
1265         username = talloc_strdup(mem_ctx, domuser);
1266         if (!username) {
1267                 return NULL;
1268         }
1269
1270         p = strchr_m( username, *lp_winbind_separator() );
1271
1272         /* code for a DOMAIN\user string */
1273
1274         if ( p ) {
1275                 pw = Get_Pwnam_alloc( mem_ctx, domuser );
1276                 if ( pw ) {
1277                         /* make sure we get the case of the username correct */
1278                         /* work around 'winbind use default domain = yes' */
1279
1280                         if ( !strchr_m( pw->pw_name, *lp_winbind_separator() ) ) {
1281                                 char *domain;
1282
1283                                 /* split the domain and username into 2 strings */
1284                                 *p = '\0';
1285                                 domain = username;
1286
1287                                 *p_save_username = talloc_asprintf(mem_ctx,
1288                                                                 "%s%c%s",
1289                                                                 domain,
1290                                                                 *lp_winbind_separator(),
1291                                                                 pw->pw_name);
1292                                 if (!*p_save_username) {
1293                                         TALLOC_FREE(pw);
1294                                         return NULL;
1295                                 }
1296                         } else {
1297                                 *p_save_username = talloc_strdup(mem_ctx, pw->pw_name);
1298                         }
1299
1300                         /* whew -- done! */
1301                         return pw;
1302                 }
1303
1304                 /* setup for lookup of just the username */
1305                 /* remember that p and username are overlapping memory */
1306
1307                 p++;
1308                 username = talloc_strdup(mem_ctx, p);
1309                 if (!username) {
1310                         return NULL;
1311                 }
1312         }
1313
1314         /* just lookup a plain username */
1315
1316         pw = Get_Pwnam_alloc(mem_ctx, username);
1317
1318         /* Create local user if requested but only if winbindd
1319            is not running.  We need to protect against cases
1320            where winbindd is failing and then prematurely
1321            creating users in /etc/passwd */
1322
1323         if ( !pw && create && !winbind_ping() ) {
1324                 /* Don't add a machine account. */
1325                 if (username[strlen(username)-1] == '$')
1326                         return NULL;
1327
1328                 _smb_create_user(NULL, username, NULL);
1329                 pw = Get_Pwnam_alloc(mem_ctx, username);
1330         }
1331
1332         /* one last check for a valid passwd struct */
1333
1334         if (pw) {
1335                 *p_save_username = talloc_strdup(mem_ctx, pw->pw_name);
1336         }
1337         return pw;
1338 }
1339
1340 /***************************************************************************
1341  Make a server_info struct from the info3 returned by a domain logon
1342 ***************************************************************************/
1343
1344 NTSTATUS make_server_info_info3(TALLOC_CTX *mem_ctx,
1345                                 const char *sent_nt_username,
1346                                 const char *domain,
1347                                 struct auth_serversupplied_info **server_info,
1348                                 struct netr_SamInfo3 *info3)
1349 {
1350         static const char zeros[16] = {0, };
1351
1352         NTSTATUS nt_status = NT_STATUS_OK;
1353         char *found_username = NULL;
1354         const char *nt_domain;
1355         const char *nt_username;
1356         bool username_was_mapped;
1357         struct passwd *pwd;
1358         struct auth_serversupplied_info *result;
1359         struct dom_sid *group_sid;
1360         struct netr_SamInfo3 *i3;
1361
1362         /*
1363            Here is where we should check the list of
1364            trusted domains, and verify that the SID
1365            matches.
1366         */
1367
1368         nt_username = talloc_strdup(mem_ctx, info3->base.account_name.string);
1369         if (!nt_username) {
1370                 /* If the server didn't give us one, just use the one we sent
1371                  * them */
1372                 nt_username = sent_nt_username;
1373         }
1374
1375         nt_domain = talloc_strdup(mem_ctx, info3->base.domain.string);
1376         if (!nt_domain) {
1377                 /* If the server didn't give us one, just use the one we sent
1378                  * them */
1379                 nt_domain = domain;
1380         }
1381
1382         /* If getpwnam() fails try the add user script (2.2.x behavior).
1383
1384            We use the _unmapped_ username here in an attempt to provide
1385            consistent username mapping behavior between kerberos and NTLM[SSP]
1386            authentication in domain mode security.  I.E. Username mapping
1387            should be applied to the fully qualified username
1388            (e.g. DOMAIN\user) and not just the login name.  Yes this means we
1389            called map_username() unnecessarily in make_user_info_map() but
1390            that is how the current code is designed.  Making the change here
1391            is the least disruptive place.  -- jerry */
1392
1393         /* this call will try to create the user if necessary */
1394
1395         nt_status = check_account(mem_ctx, nt_domain, sent_nt_username,
1396                                      &found_username, &pwd,
1397                                      &username_was_mapped);
1398
1399         if (!NT_STATUS_IS_OK(nt_status)) {
1400                 return nt_status;
1401         }
1402
1403         result = make_server_info(NULL);
1404         if (result == NULL) {
1405                 DEBUG(4, ("make_server_info failed!\n"));
1406                 return NT_STATUS_NO_MEMORY;
1407         }
1408
1409         result->unix_name = talloc_strdup(result, found_username);
1410
1411         /* copy in the info3 */
1412         result->info3 = i3 = copy_netr_SamInfo3(result, info3);
1413         if (result->info3 == NULL) {
1414                 TALLOC_FREE(result);
1415                 return NT_STATUS_NO_MEMORY;
1416         }
1417
1418         /* Fill in the unix info we found on the way */
1419         result->utok.uid = pwd->pw_uid;
1420         result->utok.gid = pwd->pw_gid;
1421
1422         /* We can't just trust that the primary group sid sent us is something
1423          * we can really use. Obtain the usable sid, and store the original
1424          * one as an additional group if it had to be replaced */
1425         nt_status = get_primary_group_sid(mem_ctx, found_username,
1426                                           &pwd, &group_sid);
1427         if (!NT_STATUS_IS_OK(nt_status)) {
1428                 TALLOC_FREE(result);
1429                 return nt_status;
1430         }
1431
1432         /* store and check if it is the same we got originally */
1433         sid_peek_rid(group_sid, &i3->base.primary_gid);
1434         if (i3->base.primary_gid != info3->base.primary_gid) {
1435                 uint32_t n = i3->base.groups.count;
1436                 /* not the same, store the original as an additional group */
1437                 i3->base.groups.rids =
1438                         talloc_realloc(i3, i3->base.groups.rids,
1439                                         struct samr_RidWithAttribute, n + 1);
1440                 if (i3->base.groups.rids == NULL) {
1441                         TALLOC_FREE(result);
1442                         return NT_STATUS_NO_MEMORY;
1443                 }
1444                 i3->base.groups.rids[n].rid = info3->base.primary_gid;
1445                 i3->base.groups.rids[n].attributes = SE_GROUP_ENABLED;
1446                 i3->base.groups.count = n + 1;
1447         }
1448
1449         /* ensure we are never given NULL session keys */
1450
1451         if (memcmp(info3->base.key.key, zeros, sizeof(zeros)) == 0) {
1452                 result->session_key = data_blob_null;
1453         } else {
1454                 result->session_key = data_blob_talloc(
1455                         result, info3->base.key.key,
1456                         sizeof(info3->base.key.key));
1457         }
1458
1459         if (memcmp(info3->base.LMSessKey.key, zeros, 8) == 0) {
1460                 result->lm_session_key = data_blob_null;
1461         } else {
1462                 result->lm_session_key = data_blob_talloc(
1463                         result, info3->base.LMSessKey.key,
1464                         sizeof(info3->base.LMSessKey.key));
1465         }
1466
1467         result->nss_token |= username_was_mapped;
1468
1469         result->guest = (info3->base.user_flags & NETLOGON_GUEST);
1470
1471         *server_info = result;
1472
1473         return NT_STATUS_OK;
1474 }
1475
1476 /*****************************************************************************
1477  Make a server_info struct from the wbcAuthUserInfo returned by a domain logon
1478 ******************************************************************************/
1479
1480 NTSTATUS make_server_info_wbcAuthUserInfo(TALLOC_CTX *mem_ctx,
1481                                           const char *sent_nt_username,
1482                                           const char *domain,
1483                                           const struct wbcAuthUserInfo *info,
1484                                           struct auth_serversupplied_info **server_info)
1485 {
1486         struct netr_SamInfo3 *info3;
1487
1488         info3 = wbcAuthUserInfo_to_netr_SamInfo3(mem_ctx, info);
1489         if (!info3) {
1490                 return NT_STATUS_NO_MEMORY;
1491         }
1492
1493         return make_server_info_info3(mem_ctx,
1494                                       sent_nt_username, domain,
1495                                       server_info, info3);
1496 }
1497
1498 /**
1499  * Verify whether or not given domain is trusted.
1500  *
1501  * @param domain_name name of the domain to be verified
1502  * @return true if domain is one of the trusted ones or
1503  *         false if otherwise
1504  **/
1505
1506 bool is_trusted_domain(const char* dom_name)
1507 {
1508         struct dom_sid trustdom_sid;
1509         bool ret;
1510
1511         /* no trusted domains for a standalone server */
1512
1513         if ( lp_server_role() == ROLE_STANDALONE )
1514                 return false;
1515
1516         if (dom_name == NULL || dom_name[0] == '\0') {
1517                 return false;
1518         }
1519
1520         if (strequal(dom_name, get_global_sam_name())) {
1521                 return false;
1522         }
1523
1524         /* if we are a DC, then check for a direct trust relationships */
1525
1526         if ( IS_DC ) {
1527                 become_root();
1528                 DEBUG (5,("is_trusted_domain: Checking for domain trust with "
1529                           "[%s]\n", dom_name ));
1530                 ret = pdb_get_trusteddom_pw(dom_name, NULL, NULL, NULL);
1531                 unbecome_root();
1532                 if (ret)
1533                         return true;
1534         }
1535         else {
1536                 wbcErr result;
1537
1538                 /* If winbind is around, ask it */
1539
1540                 result = wb_is_trusted_domain(dom_name);
1541
1542                 if (result == WBC_ERR_SUCCESS) {
1543                         return true;
1544                 }
1545
1546                 if (result == WBC_ERR_DOMAIN_NOT_FOUND) {
1547                         /* winbind could not find the domain */
1548                         return false;
1549                 }
1550
1551                 /* The only other possible result is that winbind is not up
1552                    and running. We need to update the trustdom_cache
1553                    ourselves */
1554
1555                 update_trustdom_cache();
1556         }
1557
1558         /* now the trustdom cache should be available a DC could still
1559          * have a transitive trust so fall back to the cache of trusted
1560          * domains (like a domain member would use  */
1561
1562         if ( trustdom_cache_fetch(dom_name, &trustdom_sid) ) {
1563                 return true;
1564         }
1565
1566         return false;
1567 }
1568
1569
1570
1571 /*
1572   on a logon error possibly map the error to success if "map to guest"
1573   is set approriately
1574 */
1575 NTSTATUS do_map_to_guest_server_info(NTSTATUS status,
1576                                      struct auth_serversupplied_info **server_info,
1577                                      const char *user, const char *domain)
1578 {
1579         user = user ? user : "";
1580         domain = domain ? domain : "";
1581
1582         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
1583                 if ((lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_USER) ||
1584                     (lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_PASSWORD)) {
1585                         DEBUG(3,("No such user %s [%s] - using guest account\n",
1586                                  user, domain));
1587                         return make_server_info_guest(NULL, server_info);
1588                 }
1589         } else if (NT_STATUS_EQUAL(status, NT_STATUS_WRONG_PASSWORD)) {
1590                 if (lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_PASSWORD) {
1591                         DEBUG(3,("Registered username %s for guest access\n",
1592                                 user));
1593                         return make_server_info_guest(NULL, server_info);
1594                 }
1595         }
1596
1597         return status;
1598 }