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