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                                NULL,
 226         };
 227
 228         const char *domain_attrs[] =  {"name"};
 229
 230         if (!user_info || !auth_context) {
 231                 return NT_STATUS_UNSUCCESSFUL;
 232         }
 233
 234         sam_ctx = samdb_connect(mem_ctx);
 235         if (sam_ctx == NULL) {
 236                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 237         }
 238         /* pull the user attributes */
 239         ret = samdb_search(sam_ctx, mem_ctx, NULL, &msgs, attrs,
 240                            "(&(sAMAccountName=%s)(objectclass=user))",
 241                            username);
 242
 243         if (ret == 0) {
 244                 DEBUG(3,("check_sam_security: Couldn't find user [%s] in passdb file.\n",
 245                          username));
 246                 return NT_STATUS_NO_SUCH_USER;
 247         }
 248
 249         if (ret > 1) {
 250                 DEBUG(0,("Found %d records matching user [%s]\n", ret, username));
 251                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 252         }
 253
 254         domain_sid = samdb_result_sid_prefix(mem_ctx, msgs[0], "objectSid");
 255         if (!domain_sid) {
 256                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 257         }
 258
 259         /* find the domain's DN */
 260         ret_domain = samdb_search(sam_ctx, mem_ctx, NULL, &msgs_domain, domain_attrs,
 261                            "(&(objectSid=%s)(objectclass=domain))",
 262                            domain_sid);
 263
 264         if (ret_domain == 0) {
 265                 DEBUG(3,("check_sam_security: Couldn't find domain [%s] in passdb file.\n",
 266                          domain_sid));
 267                 return NT_STATUS_NO_SUCH_USER;
 268         }
 269
 270         if (ret_domain > 1) {
 271                 DEBUG(0,("Found %d records matching domain [%s]\n",
 272                          ret_domain, domain_sid));
 273                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 274         }
 275
 276         domain_dn = msgs_domain[0]->dn;
 277
 278         acct_flags = samdb_result_acct_flags(msgs[0], "sAMAcctFlags");
 279
 280         /* Quit if the account was locked out. */
 281         if (acct_flags & ACB_AUTOLOCK) {
 282                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n",
 283                          username));
 284                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 285         }
 286
 287         if (!NT_STATUS_IS_OK(nt_status = samdb_result_passwords(mem_ctx, msgs[0],
 288                                                                 &lm_pwd, &nt_pwd))) {
 289                 return nt_status;
 290         }
 291
 292         nt_status = sam_password_ok(auth_context, mem_ctx,
 293                                     username, acct_flags,
 294                                     lm_pwd, nt_pwd,
 295                                     user_info, &user_sess_key, &lm_sess_key);
 296
 297         if (!NT_STATUS_IS_OK(nt_status)) {
 298                 return nt_status;
 299         }
 300
 301         acct_expiry = samdb_result_nttime(msgs[0], "accountExpires", 0);
 302         must_change_time = samdb_result_force_password_change(sam_ctx, mem_ctx,
 303                                                               domain_dn, msgs[0],
 304                                                               "pwdLastSet");
 305         last_set_time = samdb_result_nttime(msgs[0], "pwdLastSet", 0);
 306
 307         workstation_list = samdb_result_string(msgs[0], "userWorkstations", NULL);
 308
 309         nt_status = sam_account_ok(mem_ctx, username, acct_flags,
 310                                    &acct_expiry,
 311                                    &must_change_time,
 312                                    &last_set_time,
 313                                    workstation_list,
 314                                    user_info);
 315
 316         if (!NT_STATUS_IS_OK(nt_status)) {
 317                 return nt_status;
 318         }
 319
 320         if (!NT_STATUS_IS_OK(nt_status = make_server_info(auth_context, server_info, username))) {
 321                 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
 322                 return nt_status;
 323         }
 324
 325         {
 326                 struct ldb_message **group_msgs;
 327                 char *dn = msgs[0]->dn;
 328                 int group_ret;
 329                 const char *group_attrs[3] = { "sAMAccountType", "objectSid", NULL };
 330                 /* find list of sids */
 331                 struct dom_sid **groupSIDs = NULL;
 332                 struct dom_sid *user_sid;
 333                 struct dom_sid *primary_group_sid;
 334                 const char *sidstr;
 335                 int i;
 336
 337                 group_ret = samdb_search(sam_ctx,
 338                                          mem_ctx, NULL, &group_msgs, group_attrs,
 339                                          "(&(member=%s)(sAMAccountType=*))",
 340                                          dn);
 341                 if (group_ret == -1) {
 342                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 343                 }
 344
 345                 if (group_ret > 0 &&
 346                     !(groupSIDs = talloc_array_p(*server_info, struct dom_sid *, group_ret))) {
 347                         talloc_free(*server_info);
 348                         return NT_STATUS_NO_MEMORY;
 349                 }
 350
 351                 /* Need to unroll some nested groups, but not aliases */
 352                 for (i = 0; i < group_ret; i++) {
 353                         sidstr = ldb_msg_find_string(group_msgs[i], "objectSid", NULL);
 354                         groupSIDs[i] = dom_sid_parse_talloc(*server_info, sidstr);
 355                 }
 356
 357                 sidstr = ldb_msg_find_string(msgs[0], "objectSid", NULL);
 358                 user_sid = dom_sid_parse_talloc(*server_info, sidstr);
 359                 primary_group_sid = dom_sid_parse_talloc(*server_info, sidstr);
 360                 primary_group_sid->sub_auths[primary_group_sid->num_auths-1]
 361                         = samdb_result_uint(msgs[0], "primaryGroupID", 0);
 362
 363                 (*server_info)->user_sid = user_sid;
 364                 (*server_info)->primary_group_sid = primary_group_sid;
 365
 366                 (*server_info)->n_domain_groups = group_ret;
 367                 (*server_info)->domain_groups = groupSIDs;
 368         }
 369
 370         (*server_info)->account_name
 371                 = talloc_strdup(*server_info,
 372                                 samdb_result_string(msgs[0], "sAMAccountName", ""));
 373
 374         (*server_info)->domain
 375                 = talloc_strdup(*server_info,
 376                                 samdb_result_string(msgs_domain[0], "name", ""));
 377
 378         (*server_info)->full_name
 379                 = talloc_strdup(*server_info,
 380                                 samdb_result_string(msgs[0], "displayName", ""));
 381
 382         (*server_info)->logon_script
 383                 = talloc_strdup(*server_info,
 384                                 samdb_result_string(msgs[0], "scriptPath", ""));
 385         (*server_info)->profile_path
 386                 = talloc_strdup(*server_info,
 387                                 samdb_result_string(msgs[0], "profilePath", ""));
 388         (*server_info)->home_directory
 389                 = talloc_strdup(*server_info,
 390                                 samdb_result_string(msgs[0], "homeDirectory", ""));
 391
 392         (*server_info)->home_drive
 393                 = talloc_strdup(*server_info,
 394                                 samdb_result_string(msgs[0], "homeDrive", ""));
 395
 396         (*server_info)->last_logon = samdb_result_nttime(msgs[0], "lastLogon", 0);
 397         (*server_info)->last_logoff = samdb_result_nttime(msgs[0], "lastLogoff", 0);
 398         (*server_info)->acct_expiry = samdb_result_nttime(msgs[0], "accountExpires", 0);
 399         (*server_info)->last_password_change = samdb_result_nttime(msgs[0], "pwdLastSet", 0);
 400         (*server_info)->allow_password_change
 401                 = samdb_result_allow_password_change(sam_ctx, mem_ctx,
 402                                                      domain_dn, msgs[0], "pwdLastSet");
 403         (*server_info)->force_password_change
 404                 = samdb_result_force_password_change(sam_ctx, mem_ctx,
 405                                                      domain_dn, msgs[0], "pwdLastSet");
 406
 407         (*server_info)->logon_count = samdb_result_uint(msgs[0], "logonCount", 0);
 408         (*server_info)->bad_password_count = samdb_result_uint(msgs[0], "badPwdCount", 0);
 409
 410         (*server_info)->acct_flags = samdb_result_acct_flags(msgs[0], "userAccountControl");
 411
 412         (*server_info)->guest = False;
 413
 414         (*server_info)->user_session_key = user_sess_key;
 415         (*server_info)->lm_session_key = lm_sess_key;
 416
 417         if (!(*server_info)->account_name
 418             || !(*server_info)->full_name
 419             || !(*server_info)->logon_script
 420             || !(*server_info)->profile_path
 421             || !(*server_info)->home_directory
 422             || !(*server_info)->home_drive) {
 423                 talloc_destroy(*server_info);
 424                 return NT_STATUS_NO_MEMORY;
 425         }
 426
 427         return nt_status;
 428 }
 429
 430 /* module initialisation */
 431 static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context,
 432                                            const char *param,
 433                                            struct auth_methods **auth_method)
 434 {
 435         if (!make_auth_methods(auth_context, auth_method)) {
 436                 return NT_STATUS_NO_MEMORY;
 437         }
 438
 439         (*auth_method)->auth = check_sam_security;
 440         (*auth_method)->name = "sam_ignoredomain";
 441         return NT_STATUS_OK;
 442 }
 443
 444
 445 /****************************************************************************
 446 Check SAM security (above) but with a few extra checks.
 447 ****************************************************************************/
 448
 449 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
 450                                          void *my_private_data,
 451                                          TALLOC_CTX *mem_ctx,
 452                                          const struct auth_usersupplied_info *user_info,
 453                                          struct auth_serversupplied_info **server_info)
 454 {
 455
 456         if (!user_info || !auth_context) {
 457                 return NT_STATUS_LOGON_FAILURE;
 458         }
 459
 460         /* If we are a domain member, we must not
 461            attempt to check the password locally,
 462            unless it is one of our aliases. */
 463
 464         if (!is_myname(user_info->domain.str)) {
 465                 DEBUG(7,("The requested user domain is not the local server name. [%s]\\[%s]\n",
 466                         user_info->domain.str,user_info->internal_username.str));
 467                 return NT_STATUS_NO_SUCH_USER;
 468         }
 469
 470         return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
 471 }
 472
 473 /* module initialisation */
 474 static NTSTATUS auth_init_sam(struct auth_context *auth_context,
 475                               const char *param,
 476                               struct auth_methods **auth_method)
 477 {
 478         if (!make_auth_methods(auth_context, auth_method)) {
 479                 return NT_STATUS_NO_MEMORY;
 480         }
 481
 482         (*auth_method)->auth = check_samstrict_security;
 483         (*auth_method)->name = "sam";
 484         return NT_STATUS_OK;
 485 }
 486
 487 NTSTATUS auth_sam_init(void)
 488 {
 489         NTSTATUS ret;
 490         struct auth_operations ops;
 491
 492         ops.name = "sam";
 493         ops.init = auth_init_sam;
 494         ret = register_backend("auth", &ops);
 495         if (!NT_STATUS_IS_OK(ret)) {
 496                 DEBUG(0,("Failed to register '%s' auth backend!\n",
 497                         ops.name));
 498                 return ret;
 499         }
 500
 501         ops.name = "sam_ignoredomain";
 502         ops.init = auth_init_sam_ignoredomain;
 503         ret = register_backend("auth", &ops);
 504         if (!NT_STATUS_IS_OK(ret)) {
 505                 DEBUG(0,("Failed to register '%s' auth backend!\n",
 506                         ops.name));
 507                 return ret;
 508         }
 509
 510         return ret;
 511 }