source/auth/auth_sam.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   4    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2004
   5    Copyright (C) Gerald Carter                             2003
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 #undef DBGC_CLASS
  25 #define DBGC_CLASS DBGC_AUTH
  26
  27 /****************************************************************************
  28  Do a specific test for an smb password being correct, given a smb_password and
  29  the lanman and NT responses.
  30 ****************************************************************************/
  31
  32 static NTSTATUS sam_password_ok(const struct auth_context *auth_context,
  33                                 TALLOC_CTX *mem_ctx,
  34                                 const char *username,
  35                                 uint16_t acct_flags,
  36                                 const struct samr_Password *lm_pwd,
  37                                 const struct samr_Password *nt_pwd,
  38                                 const struct auth_usersupplied_info *user_info,
  39                                 DATA_BLOB *user_sess_key,
  40                                 DATA_BLOB *lm_sess_key)
  41 {
  42         NTSTATUS status;
  43
  44         if (acct_flags & ACB_PWNOTREQ) {
  45                 if (lp_null_passwords()) {
  46                         DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n",
  47                                  username));
  48                         return NT_STATUS_OK;
  49                 } else {
  50                         DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n",
  51                                  username));
  52                         return NT_STATUS_LOGON_FAILURE;
  53                 }
  54         }
  55
  56         status = ntlm_password_check(mem_ctx, &auth_context->challenge,
  57                                    &user_info->lm_resp, &user_info->nt_resp,
  58                                    &user_info->lm_interactive_password,
  59                                    &user_info->nt_interactive_password,
  60                                    username,
  61                                    user_info->smb_name.str,
  62                                    user_info->client_domain.str,
  63                                    lm_pwd->hash, nt_pwd->hash, user_sess_key, lm_sess_key);
  64
  65         if (NT_STATUS_IS_OK(status)) {
  66                 if (user_sess_key && user_sess_key->data) {
  67                         talloc_steal(auth_context, user_sess_key->data);
  68                 }
  69                 if (lm_sess_key && lm_sess_key->data) {
  70                         talloc_steal(auth_context, lm_sess_key->data);
  71                 }
  72         }
  73
  74         return status;
  75 }
  76
  77
  78 /****************************************************************************
  79  Do a specific test for a SAM_ACCOUNT being vaild for this connection
  80  (ie not disabled, expired and the like).
  81 ****************************************************************************/
  82
  83 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
  84                                const char *username,
  85                                uint16_t acct_flags,
  86                                NTTIME *acct_expiry,
  87                                NTTIME *must_change_time,
  88                                NTTIME *last_set_time,
  89                                const char *workstation_list,
  90                                const struct auth_usersupplied_info *user_info)
  91 {
  92         DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n", username));
  93
  94         /* Quit if the account was disabled. */
  95         if (acct_flags & ACB_DISABLED) {
  96                 DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", username));
  97                 return NT_STATUS_ACCOUNT_DISABLED;
  98         }
  99
 100         /* Quit if the account was locked out. */
 101         if (acct_flags & ACB_AUTOLOCK) {
 102                 DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", username));
 103                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 104         }
 105
 106         /* Test account expire time */
 107         if ((*acct_expiry) != -1 && time(NULL) > nt_time_to_unix(*acct_expiry)) {
 108                 DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", username));
 109                 DEBUG(3,("sam_account_ok: Account expired at '%s'.\n",
 110                          nt_time_string(mem_ctx, *acct_expiry)));
 111                 return NT_STATUS_ACCOUNT_EXPIRED;
 112         }
 113
 114         if (!(acct_flags & ACB_PWNOEXP)) {
 115
 116                 /* check for immediate expiry "must change at next logon" */
 117                 if (*must_change_time == 0 && *last_set_time != 0) {
 118                         DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n",
 119                                  username));
 120                         return NT_STATUS_PASSWORD_MUST_CHANGE;
 121                 }
 122
 123                 /* check for expired password */
 124                 if ((*must_change_time) != 0 && nt_time_to_unix(*must_change_time) < time(NULL)) {
 125                         DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n",
 126                                  username));
 127                         DEBUG(1,("sam_account_ok: Password expired at '%s' unix time.\n",
 128                                  nt_time_string(mem_ctx, *must_change_time)));
 129                         return NT_STATUS_PASSWORD_EXPIRED;
 130                 }
 131         }
 132
 133         /* Test workstation. Workstation list is comma separated. */
 134
 135         if (workstation_list && *workstation_list) {
 136                 BOOL invalid_ws = True;
 137                 const char *s = workstation_list;
 138
 139                 fstring tok;
 140
 141                 while (next_token(&s, tok, ",", sizeof(tok))) {
 142                         DEBUG(10,("sam_account_ok: checking for workstation match %s and %s (len=%d)\n",
 143                                   tok, user_info->wksta_name.str, user_info->wksta_name.len));
 144
 145                         if(strequal(tok, user_info->wksta_name.str)) {
 146                                 invalid_ws = False;
 147                                 break;
 148                         }
 149                 }
 150
 151                 if (invalid_ws)
 152                         return NT_STATUS_INVALID_WORKSTATION;
 153         }
 154
 155         if (acct_flags & ACB_DOMTRUST) {
 156                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", username));
 157                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 158         }
 159
 160         if (acct_flags & ACB_SVRTRUST) {
 161                 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", username));
 162                 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 163         }
 164
 165         if (acct_flags & ACB_WSTRUST) {
 166                 DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", username));
 167                 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 168         }
 169
 170         return NT_STATUS_OK;
 171 }
 172
 173 /****************************************************************************
 174 check if a username/password is OK assuming the password is a 24 byte
 175 SMB hash supplied in the user_info structure
 176 return an NT_STATUS constant.
 177 ****************************************************************************/
 178
 179 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
 180                                    void *my_private_data,
 181                                    TALLOC_CTX *mem_ctx,
 182                                    const struct auth_usersupplied_info *user_info,
 183                                    struct auth_serversupplied_info **server_info)
 184 {
 185         struct ldb_message **msgs;
 186         struct ldb_message **msgs_domain;
 187         void *sam_ctx;
 188         char *username = user_info->internal_username.str;
 189         uint16_t acct_flags;
 190         const char *workstation_list;
 191         NTTIME acct_expiry;
 192         NTTIME must_change_time;
 193         NTTIME last_set_time;
 194
 195         uint_t ret;
 196         uint_t ret_domain;
 197
 198         const char *domain_dn;
 199         const char *domain_sid;
 200
 201         NTSTATUS nt_status;
 202         DATA_BLOB user_sess_key = data_blob(NULL, 0);
 203         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
 204         struct samr_Password *lm_pwd, *nt_pwd;
 205
 206         const char *attrs[] = {"unicodePwd", "lmPwdHash", "ntPwdHash",
 207                                "userAccountControl",
 208                                "pwdLastSet",
 209                                "accountExpires",
 210                                "objectSid",
 211                                "userWorkstations",
 212
 213                                /* required for server_info, not access control: */
 214                                "sAMAccountName",
 215                                "displayName",
 216                                "scriptPath",
 217                                "profilePath",
 218                                "homeDirectory",
 219                                "homeDrive",
 220                                "lastLogon",
 221                                "lastLogoff",
 222                                "accountExpires",
 223                                "badPwdCount",
 224                                "logonCount",
 225                                "primaryGroupID",
 226                                NULL,
 227         };
 228
 229         const char *domain_attrs[] =  {"name"};
 230
 231         if (!user_info || !auth_context) {
 232                 return NT_STATUS_UNSUCCESSFUL;
 233         }
 234
 235         sam_ctx = samdb_connect(mem_ctx);
 236         if (sam_ctx == NULL) {
 237                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 238         }
 239         /* pull the user attributes */
 240         ret = samdb_search(sam_ctx, mem_ctx, NULL, &msgs, attrs,
 241                            "(&(sAMAccountName=%s)(objectclass=user))",
 242                            username);
 243
 244         if (ret == 0) {
 245                 DEBUG(3,("check_sam_security: Couldn't find user [%s] in passdb file.\n",
 246                          username));
 247                 return NT_STATUS_NO_SUCH_USER;
 248         }
 249
 250         if (ret > 1) {
 251                 DEBUG(0,("Found %d records matching user [%s]\n", ret, username));
 252                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 253         }
 254
 255         domain_sid = samdb_result_sid_prefix(mem_ctx, msgs[0], "objectSid");
 256         if (!domain_sid) {
 257                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 258         }
 259
 260         /* find the domain's DN */
 261         ret_domain = samdb_search(sam_ctx, mem_ctx, NULL, &msgs_domain, domain_attrs,
 262                            "(&(objectSid=%s)(objectclass=domain))",
 263                            domain_sid);
 264
 265         if (ret_domain == 0) {
 266                 DEBUG(3,("check_sam_security: Couldn't find domain [%s] in passdb file.\n",
 267                          domain_sid));
 268                 return NT_STATUS_NO_SUCH_USER;
 269         }
 270
 271         if (ret_domain > 1) {
 272                 DEBUG(0,("Found %d records matching domain [%s]\n",
 273                          ret_domain, domain_sid));
 274                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 275         }
 276
 277         domain_dn = msgs_domain[0]->dn;
 278
 279         acct_flags = samdb_result_acct_flags(msgs[0], "sAMAcctFlags");
 280
 281         /* Quit if the account was locked out. */
 282         if (acct_flags & ACB_AUTOLOCK) {
 283                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n",
 284                          username));
 285                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 286         }
 287
 288         if (!NT_STATUS_IS_OK(nt_status = samdb_result_passwords(mem_ctx, msgs[0],
 289                                                                 &lm_pwd, &nt_pwd))) {
 290                 return nt_status;
 291         }
 292
 293         nt_status = sam_password_ok(auth_context, mem_ctx,
 294                                     username, acct_flags,
 295                                     lm_pwd, nt_pwd,
 296                                     user_info, &user_sess_key, &lm_sess_key);
 297
 298         if (!NT_STATUS_IS_OK(nt_status)) {
 299                 return nt_status;
 300         }
 301
 302         acct_expiry = samdb_result_nttime(msgs[0], "accountExpires", 0);
 303         must_change_time = samdb_result_force_password_change(sam_ctx, mem_ctx,
 304                                                               domain_dn, msgs[0],
 305                                                               "pwdLastSet");
 306         last_set_time = samdb_result_nttime(msgs[0], "pwdLastSet", 0);
 307
 308         workstation_list = samdb_result_string(msgs[0], "userWorkstations", NULL);
 309
 310         nt_status = sam_account_ok(mem_ctx, username, acct_flags,
 311                                    &acct_expiry,
 312                                    &must_change_time,
 313                                    &last_set_time,
 314                                    workstation_list,
 315                                    user_info);
 316
 317         if (!NT_STATUS_IS_OK(nt_status)) {
 318                 return nt_status;
 319         }
 320
 321         if (!NT_STATUS_IS_OK(nt_status = make_server_info(auth_context, server_info, username))) {
 322                 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
 323                 return nt_status;
 324         }
 325
 326         {
 327                 struct ldb_message **group_msgs;
 328                 char *dn = msgs[0]->dn;
 329                 int group_ret;
 330                 const char *group_attrs[3] = { "sAMAccountType", "objectSid", NULL };
 331                 /* find list of sids */
 332                 struct dom_sid **groupSIDs = NULL;
 333                 struct dom_sid *user_sid;
 334                 struct dom_sid *primary_group_sid;
 335                 const char *sidstr;
 336                 int i;
 337                 uint_t rid;
 338
 339                 group_ret = samdb_search(sam_ctx,
 340                                          mem_ctx, NULL, &group_msgs, group_attrs,
 341                                          "(&(member=%s)(sAMAccountType=*))",
 342                                          dn);
 343                 if (group_ret == -1) {
 344                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 345                 }
 346
 347                 if (group_ret > 0 &&
 348                     !(groupSIDs = talloc_array_p(*server_info, struct dom_sid *, group_ret))) {
 349                         talloc_free(*server_info);
 350                         return NT_STATUS_NO_MEMORY;
 351                 }
 352
 353                 /* Need to unroll some nested groups, but not aliases */
 354                 for (i = 0; i < group_ret; i++) {
 355                         sidstr = ldb_msg_find_string(group_msgs[i], "objectSid", NULL);
 356                         groupSIDs[i] = dom_sid_parse_talloc(*server_info, sidstr);
 357                 }
 358
 359                 sidstr = ldb_msg_find_string(msgs[0], "objectSid", NULL);
 360                 user_sid = dom_sid_parse_talloc(*server_info, sidstr);
 361                 primary_group_sid = dom_sid_parse_talloc(*server_info, sidstr);
 362                 rid = samdb_result_uint(msgs[0], "primaryGroupID", ~0);
 363                 if (rid == ~0) {
 364                         if (group_ret > 0) {
 365                                 primary_group_sid = groupSIDs[0];
 366                         } else {
 367                                 primary_group_sid = NULL;
 368                         }
 369                 } else {
 370                         primary_group_sid->sub_auths[primary_group_sid->num_auths-1] = rid;
 371                 }
 372
 373                 (*server_info)->user_sid = user_sid;
 374                 (*server_info)->primary_group_sid = primary_group_sid;
 375
 376                 (*server_info)->n_domain_groups = group_ret;
 377                 (*server_info)->domain_groups = groupSIDs;
 378         }
 379
 380         (*server_info)->account_name
 381                 = talloc_strdup(*server_info,
 382                                 samdb_result_string(msgs[0], "sAMAccountName", ""));
 383
 384         (*server_info)->domain
 385                 = talloc_strdup(*server_info,
 386                                 samdb_result_string(msgs_domain[0], "name", ""));
 387
 388         (*server_info)->full_name
 389                 = talloc_strdup(*server_info,
 390                                 samdb_result_string(msgs[0], "displayName", ""));
 391
 392         (*server_info)->logon_script
 393                 = talloc_strdup(*server_info,
 394                                 samdb_result_string(msgs[0], "scriptPath", ""));
 395         (*server_info)->profile_path
 396                 = talloc_strdup(*server_info,
 397                                 samdb_result_string(msgs[0], "profilePath", ""));
 398         (*server_info)->home_directory
 399                 = talloc_strdup(*server_info,
 400                                 samdb_result_string(msgs[0], "homeDirectory", ""));
 401
 402         (*server_info)->home_drive
 403                 = talloc_strdup(*server_info,
 404                                 samdb_result_string(msgs[0], "homeDrive", ""));
 405
 406         (*server_info)->last_logon = samdb_result_nttime(msgs[0], "lastLogon", 0);
 407         (*server_info)->last_logoff = samdb_result_nttime(msgs[0], "lastLogoff", 0);
 408         (*server_info)->acct_expiry = samdb_result_nttime(msgs[0], "accountExpires", 0);
 409         (*server_info)->last_password_change = samdb_result_nttime(msgs[0], "pwdLastSet", 0);
 410         (*server_info)->allow_password_change
 411                 = samdb_result_allow_password_change(sam_ctx, mem_ctx,
 412                                                      domain_dn, msgs[0], "pwdLastSet");
 413         (*server_info)->force_password_change
 414                 = samdb_result_force_password_change(sam_ctx, mem_ctx,
 415                                                      domain_dn, msgs[0], "pwdLastSet");
 416
 417         (*server_info)->logon_count = samdb_result_uint(msgs[0], "logonCount", 0);
 418         (*server_info)->bad_password_count = samdb_result_uint(msgs[0], "badPwdCount", 0);
 419
 420         (*server_info)->acct_flags = samdb_result_acct_flags(msgs[0], "userAccountControl");
 421
 422         (*server_info)->guest = False;
 423
 424         (*server_info)->user_session_key = user_sess_key;
 425         (*server_info)->lm_session_key = lm_sess_key;
 426
 427         if (!(*server_info)->account_name
 428             || !(*server_info)->full_name
 429             || !(*server_info)->logon_script
 430             || !(*server_info)->profile_path
 431             || !(*server_info)->home_directory
 432             || !(*server_info)->home_drive) {
 433                 talloc_destroy(*server_info);
 434                 return NT_STATUS_NO_MEMORY;
 435         }
 436
 437         return nt_status;
 438 }
 439
 440 /* module initialisation */
 441 static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context,
 442                                            const char *param,
 443                                            struct auth_methods **auth_method)
 444 {
 445         if (!make_auth_methods(auth_context, auth_method)) {
 446                 return NT_STATUS_NO_MEMORY;
 447         }
 448
 449         (*auth_method)->auth = check_sam_security;
 450         (*auth_method)->name = "sam_ignoredomain";
 451         return NT_STATUS_OK;
 452 }
 453
 454
 455 /****************************************************************************
 456 Check SAM security (above) but with a few extra checks.
 457 ****************************************************************************/
 458
 459 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
 460                                          void *my_private_data,
 461                                          TALLOC_CTX *mem_ctx,
 462                                          const struct auth_usersupplied_info *user_info,
 463                                          struct auth_serversupplied_info **server_info)
 464 {
 465
 466         if (!user_info || !auth_context) {
 467                 return NT_STATUS_LOGON_FAILURE;
 468         }
 469
 470         /* If we are a domain member, we must not
 471            attempt to check the password locally,
 472            unless it is one of our aliases. */
 473
 474         if (!is_myname(user_info->domain.str)) {
 475                 DEBUG(7,("The requested user domain is not the local server name. [%s]\\[%s]\n",
 476                         user_info->domain.str,user_info->internal_username.str));
 477                 return NT_STATUS_NO_SUCH_USER;
 478         }
 479
 480         return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
 481 }
 482
 483 /* module initialisation */
 484 static NTSTATUS auth_init_sam(struct auth_context *auth_context,
 485                               const char *param,
 486                               struct auth_methods **auth_method)
 487 {
 488         if (!make_auth_methods(auth_context, auth_method)) {
 489                 return NT_STATUS_NO_MEMORY;
 490         }
 491
 492         (*auth_method)->auth = check_samstrict_security;
 493         (*auth_method)->name = "sam";
 494         return NT_STATUS_OK;
 495 }
 496
 497 NTSTATUS auth_sam_init(void)
 498 {
 499         NTSTATUS ret;
 500         struct auth_operations ops;
 501
 502         ops.name = "sam";
 503         ops.init = auth_init_sam;
 504         ret = register_backend("auth", &ops);
 505         if (!NT_STATUS_IS_OK(ret)) {
 506                 DEBUG(0,("Failed to register '%s' auth backend!\n",
 507                         ops.name));
 508                 return ret;
 509         }
 510
 511         ops.name = "sam_ignoredomain";
 512         ops.init = auth_init_sam_ignoredomain;
 513         ret = register_backend("auth", &ops);
 514         if (!NT_STATUS_IS_OK(ret)) {
 515                 DEBUG(0,("Failed to register '%s' auth backend!\n",
 516                         ops.name));
 517                 return ret;
 518         }
 519
 520         return ret;
 521 }