source4/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(mem_ctx);
 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                 return NT_STATUS_NO_SUCH_USER;
 234         }
 235
 236         if (ret > 1) {
 237                 DEBUG(0,("Found %d records matching user [%s]\n", ret, username));
 238                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 239         }
 240
 241         domain_sid = samdb_result_sid_prefix(mem_ctx, msgs[0], "objectSid");
 242         if (!domain_sid) {
 243                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 244         }
 245
 246         /* find the domain's DN */
 247         ret_domain = samdb_search(sam_ctx, mem_ctx, NULL, &msgs_domain, domain_attrs,
 248                            "(&(objectSid=%s)(objectclass=domain))",
 249                            domain_sid);
 250
 251         if (ret_domain == 0) {
 252                 DEBUG(3,("check_sam_security: Couldn't find domain [%s] in passdb file.\n",
 253                          domain_sid));
 254                 return NT_STATUS_NO_SUCH_USER;
 255         }
 256
 257         if (ret_domain > 1) {
 258                 DEBUG(0,("Found %d records matching domain [%s]\n",
 259                          ret_domain, domain_sid));
 260                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 261         }
 262
 263         domain_dn = msgs_domain[0]->dn;
 264
 265         acct_flags = samdb_result_acct_flags(msgs[0], "sAMAcctFlags");
 266
 267         /* Quit if the account was locked out. */
 268         if (acct_flags & ACB_AUTOLOCK) {
 269                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n",
 270                          username));
 271                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 272         }
 273
 274         if (!NT_STATUS_IS_OK(nt_status = samdb_result_passwords(mem_ctx, msgs[0],
 275                                                                 &lm_pwd, &nt_pwd))) {
 276                 return nt_status;
 277         }
 278
 279         nt_status = sam_password_ok(auth_context, mem_ctx,
 280                                     username, acct_flags,
 281                                     lm_pwd, nt_pwd,
 282                                     user_info, &user_sess_key, &lm_sess_key);
 283
 284         if (!NT_STATUS_IS_OK(nt_status)) {
 285                 return nt_status;
 286         }
 287
 288         acct_expiry = samdb_result_nttime(msgs[0], "accountExpires", 0);
 289         must_change_time = samdb_result_force_password_change(sam_ctx, mem_ctx,
 290                                                               domain_dn, msgs[0],
 291                                                               "pwdLastSet");
 292         last_set_time = samdb_result_nttime(msgs[0], "pwdLastSet", 0);
 293
 294         workstation_list = samdb_result_string(msgs[0], "userWorkstations", NULL);
 295
 296         nt_status = sam_account_ok(mem_ctx, username, acct_flags,
 297                                    &acct_expiry,
 298                                    &must_change_time,
 299                                    &last_set_time,
 300                                    workstation_list,
 301                                    user_info);
 302
 303         if (!NT_STATUS_IS_OK(nt_status)) {
 304                 return nt_status;
 305         }
 306
 307         if (!NT_STATUS_IS_OK(nt_status = make_server_info(server_info, username))) {
 308                 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
 309                 return nt_status;
 310         }
 311
 312         {
 313                 struct ldb_message **group_msgs;
 314                 char *dn = msgs[0]->dn;
 315                 int group_ret;
 316                 const char *group_attrs[3] = { "sAMAccountType", "objectSid", NULL };
 317                 /* find list of sids */
 318                 struct dom_sid **groupSIDs = NULL;
 319                 struct dom_sid *user_sid;
 320                 struct dom_sid *primary_group_sid;
 321                 const char *sidstr;
 322                 int i;
 323
 324                 group_ret = samdb_search(sam_ctx,
 325                                          mem_ctx, NULL, &group_msgs, group_attrs,
 326                                          "(&(member=%s)(sAMAccountType=*))",
 327                                          dn);
 328                 if (group_ret == -1) {
 329                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 330                 }
 331
 332                 if (group_ret > 0 &&
 333                     !(groupSIDs = talloc_realloc_p(groupSIDs,
 334                                                    struct dom_sid *, group_ret))) {
 335                         talloc_free(*server_info);
 336                         return NT_STATUS_NO_MEMORY;
 337                 }
 338
 339                 /* Need to unroll some nested groups, but not aliases */
 340                 for (i = 0; i < group_ret; i++) {
 341                         sidstr = ldb_msg_find_string(group_msgs[i], "objectSid", NULL);
 342                         groupSIDs[i] = dom_sid_parse_talloc(*server_info, sidstr);
 343                 }
 344
 345                 sidstr = ldb_msg_find_string(msgs[0], "objectSid", NULL);
 346                 user_sid = dom_sid_parse_talloc(*server_info, sidstr);
 347                 primary_group_sid = dom_sid_parse_talloc(*server_info, sidstr);
 348                 primary_group_sid->sub_auths[primary_group_sid->num_auths-1]
 349                         = samdb_result_uint(msgs[0], "primaryGroupID", 0);
 350
 351                 (*server_info)->user_sid = user_sid;
 352                 (*server_info)->primary_group_sid = primary_group_sid;
 353
 354                 (*server_info)->n_domain_groups = group_ret;
 355                 (*server_info)->domain_groups = groupSIDs;
 356         }
 357
 358         (*server_info)->account_name
 359                 = talloc_strdup(*server_info,
 360                                 samdb_result_string(msgs[0], "sAMAccountName", ""));
 361
 362         (*server_info)->domain
 363                 = talloc_strdup(*server_info,
 364                                 samdb_result_string(msgs_domain[0], "name", ""));
 365
 366         (*server_info)->full_name
 367                 = talloc_strdup(*server_info,
 368                                 samdb_result_string(msgs[0], "displayName", ""));
 369
 370         (*server_info)->logon_script
 371                 = talloc_strdup(*server_info,
 372                                 samdb_result_string(msgs[0], "scriptPath", ""));
 373         (*server_info)->profile_path
 374                 = talloc_strdup(*server_info,
 375                                 samdb_result_string(msgs[0], "profilePath", ""));
 376         (*server_info)->home_directory
 377                 = talloc_strdup(*server_info,
 378                                 samdb_result_string(msgs[0], "homeDirectory", ""));
 379
 380         (*server_info)->home_drive
 381                 = talloc_strdup(*server_info,
 382                                 samdb_result_string(msgs[0], "homeDrive", ""));
 383
 384         (*server_info)->last_logon = samdb_result_nttime(msgs[0], "lastLogon", 0);
 385         (*server_info)->last_logoff = samdb_result_nttime(msgs[0], "lastLogoff", 0);
 386         (*server_info)->acct_expiry = samdb_result_nttime(msgs[0], "accountExpires", 0);
 387         (*server_info)->last_password_change = samdb_result_nttime(msgs[0], "pwdLastSet", 0);
 388         (*server_info)->allow_password_change
 389                 = samdb_result_allow_password_change(sam_ctx, mem_ctx,
 390                                                      domain_dn, msgs[0], "pwdLastSet");
 391         (*server_info)->force_password_change
 392                 = samdb_result_force_password_change(sam_ctx, mem_ctx,
 393                                                      domain_dn, msgs[0], "pwdLastSet");
 394
 395         (*server_info)->logon_count = samdb_result_uint(msgs[0], "logonCount", 0);
 396         (*server_info)->bad_password_count = samdb_result_uint(msgs[0], "badPwdCount", 0);
 397
 398         (*server_info)->acct_flags = samdb_result_acct_flags(msgs[0], "userAccountControl");
 399
 400         (*server_info)->guest = False;
 401
 402         (*server_info)->user_session_key = user_sess_key;
 403         (*server_info)->lm_session_key = lm_sess_key;
 404
 405         if (!(*server_info)->account_name
 406             || !(*server_info)->full_name
 407             || !(*server_info)->logon_script
 408             || !(*server_info)->profile_path
 409             || !(*server_info)->home_directory
 410             || !(*server_info)->home_drive) {
 411                 talloc_destroy(*server_info);
 412                 return NT_STATUS_NO_MEMORY;
 413         }
 414
 415         return nt_status;
 416 }
 417
 418 /* module initialisation */
 419 static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context,
 420                                            const char *param,
 421                                            struct auth_methods **auth_method)
 422 {
 423         if (!make_auth_methods(auth_context, auth_method)) {
 424                 return NT_STATUS_NO_MEMORY;
 425         }
 426
 427         (*auth_method)->auth = check_sam_security;
 428         (*auth_method)->name = "sam_ignoredomain";
 429         return NT_STATUS_OK;
 430 }
 431
 432
 433 /****************************************************************************
 434 Check SAM security (above) but with a few extra checks.
 435 ****************************************************************************/
 436
 437 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
 438                                          void *my_private_data,
 439                                          TALLOC_CTX *mem_ctx,
 440                                          const struct auth_usersupplied_info *user_info,
 441                                          struct auth_serversupplied_info **server_info)
 442 {
 443
 444         if (!user_info || !auth_context) {
 445                 return NT_STATUS_LOGON_FAILURE;
 446         }
 447
 448         /* If we are a domain member, we must not
 449            attempt to check the password locally,
 450            unless it is one of our aliases. */
 451
 452         if (!is_myname(user_info->domain.str)) {
 453                 DEBUG(7,("The requested user domain is not the local server name. [%s]\\[%s]\n",
 454                         user_info->domain.str,user_info->internal_username.str));
 455                 return NT_STATUS_NO_SUCH_USER;
 456         }
 457
 458         return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
 459 }
 460
 461 /* module initialisation */
 462 static NTSTATUS auth_init_sam(struct auth_context *auth_context,
 463                               const char *param,
 464                               struct auth_methods **auth_method)
 465 {
 466         if (!make_auth_methods(auth_context, auth_method)) {
 467                 return NT_STATUS_NO_MEMORY;
 468         }
 469
 470         (*auth_method)->auth = check_samstrict_security;
 471         (*auth_method)->name = "sam";
 472         return NT_STATUS_OK;
 473 }
 474
 475 NTSTATUS auth_sam_init(void)
 476 {
 477         NTSTATUS ret;
 478         struct auth_operations ops;
 479
 480         ops.name = "sam";
 481         ops.init = auth_init_sam;
 482         ret = register_backend("auth", &ops);
 483         if (!NT_STATUS_IS_OK(ret)) {
 484                 DEBUG(0,("Failed to register '%s' auth backend!\n",
 485                         ops.name));
 486                 return ret;
 487         }
 488
 489         ops.name = "sam_ignoredomain";
 490         ops.init = auth_init_sam_ignoredomain;
 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         return ret;
 499 }