source4/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    Copyright (C) Stefan Metzmacher                         2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "system/time.h"
  24 #include "auth/auth.h"
  25 #include <ldb.h>
  26 #include "../lib/util/util_ldb.h"
  27 #include "dsdb/samdb/samdb.h"
  28 #include "libcli/security/security.h"
  29 #include "libcli/ldap/ldap.h"
  30 #include "librpc/gen_ndr/ndr_netlogon.h"
  31 #include "param/param.h"
  32 #include "auth/auth_sam.h"
  33
  34 const char *user_attrs[] = {
  35         /* required for the krb5 kdc */
  36         "objectClass",
  37         "sAMAccountName",
  38         "userPrincipalName",
  39         "servicePrincipalName",
  40         "msDS-KeyVersionNumber",
  41         "supplementalCredentials",
  42
  43         /* passwords */
  44         "dBCSPwd",
  45         "unicodePwd",
  46
  47         "userAccountControl",
  48
  49         "pwdLastSet",
  50         "accountExpires",
  51         "logonHours",
  52         "objectSid",
  53
  54         /* check 'allowed workstations' */
  55         "userWorkstations",
  56
  57         /* required for server_info, not access control: */
  58         "displayName",
  59         "scriptPath",
  60         "profilePath",
  61         "homeDirectory",
  62         "homeDrive",
  63         "lastLogon",
  64         "lastLogoff",
  65         "accountExpires",
  66         "badPwdCount",
  67         "logonCount",
  68         "primaryGroupID",
  69         NULL,
  70 };
  71
  72 const char *domain_ref_attrs[] =  {"nETBIOSName", "nCName",
  73                                    "dnsRoot", "objectClass", NULL};
  74
  75 /****************************************************************************
  76  Check if a user is allowed to logon at this time. Note this is the
  77  servers local time, as logon hours are just specified as a weekly
  78  bitmask.
  79 ****************************************************************************/
  80
  81 static bool logon_hours_ok(struct ldb_message *msg, const char *name_for_logs)
  82 {
  83         /* In logon hours first bit is Sunday from 12AM to 1AM */
  84         const struct ldb_val *hours;
  85         struct tm *utctime;
  86         time_t lasttime;
  87         const char *asct;
  88         uint8_t bitmask, bitpos;
  89
  90         hours = ldb_msg_find_ldb_val(msg, "logonHours");
  91         if (!hours) {
  92                 DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n", name_for_logs));
  93                 return true;
  94         }
  95
  96         if (hours->length != 168/8) {
  97                 DEBUG(5,("logon_hours_ok: malformed logon hours restrictions for user %s\n", name_for_logs));
  98                 return true;
  99         }
 100
 101         lasttime = time(NULL);
 102         utctime = gmtime(&lasttime);
 103         if (!utctime) {
 104                 DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n",
 105                         name_for_logs));
 106                 return false;
 107         }
 108
 109         /* find the corresponding byte and bit */
 110         bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
 111         bitmask = 1 << (bitpos % 8);
 112
 113         if (! (hours->data[bitpos/8] & bitmask)) {
 114                 struct tm *t = localtime(&lasttime);
 115                 if (!t) {
 116                         asct = "INVALID TIME";
 117                 } else {
 118                         asct = asctime(t);
 119                         if (!asct) {
 120                                 asct = "INVALID TIME";
 121                         }
 122                 }
 123
 124                 DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to "
 125                           "logon at this time (%s).\n",
 126                           name_for_logs, asct ));
 127                 return false;
 128         }
 129
 130         asct = asctime(utctime);
 131         DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
 132                 name_for_logs, asct ? asct : "UNKNOWN TIME" ));
 133
 134         return true;
 135 }
 136
 137 /****************************************************************************
 138  Do a specific test for a SAM_ACCOUNT being vaild for this connection
 139  (ie not disabled, expired and the like).
 140 ****************************************************************************/
 141 _PUBLIC_ NTSTATUS authsam_account_ok(TALLOC_CTX *mem_ctx,
 142                             struct ldb_context *sam_ctx,
 143                             uint32_t logon_parameters,
 144                             struct ldb_message *msg,
 145                             struct ldb_message *msg_domain_ref,
 146                             const char *logon_workstation,
 147                             const char *name_for_logs,
 148                             bool allow_domain_trust)
 149 {
 150         uint16_t acct_flags;
 151         const char *workstation_list;
 152         NTTIME acct_expiry;
 153         NTTIME must_change_time;
 154
 155         struct ldb_dn *domain_dn = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", ldb_dn_new(mem_ctx, sam_ctx, NULL));
 156
 157         NTTIME now;
 158         DEBUG(4,("authsam_account_ok: Checking SMB password for user %s\n", name_for_logs));
 159
 160         acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx, msg, domain_dn);
 161
 162         acct_expiry = samdb_result_account_expires(msg);
 163
 164         /* Check for when we must change this password, taking the
 165          * userAccountControl flags into account */
 166         must_change_time = samdb_result_force_password_change(sam_ctx, mem_ctx,
 167                                                               domain_dn, msg);
 168
 169         workstation_list = samdb_result_string(msg, "userWorkstations", NULL);
 170
 171         /* Quit if the account was disabled. */
 172         if (acct_flags & ACB_DISABLED) {
 173                 DEBUG(1,("authsam_account_ok: Account for user '%s' was disabled.\n", name_for_logs));
 174                 return NT_STATUS_ACCOUNT_DISABLED;
 175         }
 176
 177         /* Quit if the account was locked out. */
 178         if (acct_flags & ACB_AUTOLOCK) {
 179                 DEBUG(1,("authsam_account_ok: Account for user %s was locked out.\n", name_for_logs));
 180                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 181         }
 182
 183         /* Test account expire time */
 184         unix_to_nt_time(&now, time(NULL));
 185         if (now > acct_expiry) {
 186                 DEBUG(1,("authsam_account_ok: Account for user '%s' has expired.\n", name_for_logs));
 187                 DEBUG(3,("authsam_account_ok: Account expired at '%s'.\n",
 188                          nt_time_string(mem_ctx, acct_expiry)));
 189                 return NT_STATUS_ACCOUNT_EXPIRED;
 190         }
 191
 192         /* check for immediate expiry "must change at next logon" */
 193         if (must_change_time == 0) {
 194                 DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n",
 195                          name_for_logs));
 196                 return NT_STATUS_PASSWORD_MUST_CHANGE;
 197         }
 198
 199         /* check for expired password */
 200         if (must_change_time < now) {
 201                 DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n",
 202                          name_for_logs));
 203                 DEBUG(1,("sam_account_ok: Password expired at '%s' unix time.\n",
 204                          nt_time_string(mem_ctx, must_change_time)));
 205                 return NT_STATUS_PASSWORD_EXPIRED;
 206         }
 207
 208         /* Test workstation. Workstation list is comma separated. */
 209         if (logon_workstation && workstation_list && *workstation_list) {
 210                 bool invalid_ws = true;
 211                 int i;
 212                 const char **workstations = (const char **)str_list_make(mem_ctx, workstation_list, ",");
 213
 214                 for (i = 0; workstations && workstations[i]; i++) {
 215                         DEBUG(10,("sam_account_ok: checking for workstation match '%s' and '%s'\n",
 216                                   workstations[i], logon_workstation));
 217
 218                         if (strequal(workstations[i], logon_workstation)) {
 219                                 invalid_ws = false;
 220                                 break;
 221                         }
 222                 }
 223
 224                 talloc_free(workstations);
 225
 226                 if (invalid_ws) {
 227                         return NT_STATUS_INVALID_WORKSTATION;
 228                 }
 229         }
 230
 231         if (!logon_hours_ok(msg, name_for_logs)) {
 232                 return NT_STATUS_INVALID_LOGON_HOURS;
 233         }
 234
 235         if (!allow_domain_trust) {
 236                 if (acct_flags & ACB_DOMTRUST) {
 237                         DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", name_for_logs));
 238                         return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 239                 }
 240         }
 241         if (!(logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
 242                 if (acct_flags & ACB_SVRTRUST) {
 243                         DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", name_for_logs));
 244                         return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 245                 }
 246         }
 247         if (!(logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
 248                 if (acct_flags & ACB_WSTRUST) {
 249                         DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", name_for_logs));
 250                         return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 251                 }
 252         }
 253
 254         return NT_STATUS_OK;
 255 }
 256
 257 _PUBLIC_ NTSTATUS authsam_make_server_info(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 258                                            const char *netbios_name,
 259                                            struct ldb_message *msg,
 260                                            struct ldb_message *msg_domain_ref,
 261                                            DATA_BLOB user_sess_key, DATA_BLOB lm_sess_key,
 262                                            struct auth_serversupplied_info **_server_info)
 263 {
 264         struct auth_serversupplied_info *server_info;
 265         struct ldb_message **group_msgs;
 266         int group_ret;
 267         const char *group_attrs[3] = { "sAMAccountType", "objectSid", NULL };
 268         /* find list of sids */
 269         struct dom_sid **groupSIDs = NULL;
 270         struct dom_sid *account_sid;
 271         struct dom_sid *primary_group_sid;
 272         struct ldb_dn *domain_dn;
 273         const char *str;
 274         struct ldb_dn *ncname;
 275         int i;
 276         uint_t rid;
 277         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 278
 279         group_ret = gendb_search(sam_ctx,
 280                                  tmp_ctx, NULL, &group_msgs, group_attrs,
 281                                  "(&(member=%s)(sAMAccountType=*))",
 282                                  ldb_dn_get_linearized(msg->dn));
 283         if (group_ret == -1) {
 284                 talloc_free(tmp_ctx);
 285                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 286         }
 287
 288         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 289         NT_STATUS_HAVE_NO_MEMORY(server_info);
 290
 291         if (group_ret > 0) {
 292                 groupSIDs = talloc_array(server_info, struct dom_sid *, group_ret);
 293                 NT_STATUS_HAVE_NO_MEMORY(groupSIDs);
 294         }
 295
 296         /* Need to unroll some nested groups, but not aliases */
 297         for (i = 0; i < group_ret; i++) {
 298                 groupSIDs[i] = samdb_result_dom_sid(groupSIDs,
 299                                                     group_msgs[i], "objectSid");
 300                 NT_STATUS_HAVE_NO_MEMORY(groupSIDs[i]);
 301         }
 302
 303         talloc_free(tmp_ctx);
 304
 305         account_sid = samdb_result_dom_sid(server_info, msg, "objectSid");
 306         NT_STATUS_HAVE_NO_MEMORY(account_sid);
 307
 308         primary_group_sid = dom_sid_dup(server_info, account_sid);
 309         NT_STATUS_HAVE_NO_MEMORY(primary_group_sid);
 310
 311         rid = samdb_result_uint(msg, "primaryGroupID", ~0);
 312         if (rid == ~0) {
 313                 if (group_ret > 0) {
 314                         primary_group_sid = groupSIDs[0];
 315                 } else {
 316                         primary_group_sid = NULL;
 317                 }
 318         } else {
 319                 primary_group_sid->sub_auths[primary_group_sid->num_auths-1] = rid;
 320         }
 321
 322         server_info->account_sid = account_sid;
 323         server_info->primary_group_sid = primary_group_sid;
 324
 325         server_info->n_domain_groups = group_ret;
 326         server_info->domain_groups = groupSIDs;
 327
 328         server_info->account_name = talloc_steal(server_info, samdb_result_string(msg, "sAMAccountName", NULL));
 329
 330         server_info->domain_name = talloc_steal(server_info, samdb_result_string(msg_domain_ref, "nETBIOSName", NULL));
 331
 332         str = samdb_result_string(msg, "displayName", "");
 333         server_info->full_name = talloc_strdup(server_info, str);
 334         NT_STATUS_HAVE_NO_MEMORY(server_info->full_name);
 335
 336         str = samdb_result_string(msg, "scriptPath", "");
 337         server_info->logon_script = talloc_strdup(server_info, str);
 338         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_script);
 339
 340         str = samdb_result_string(msg, "profilePath", "");
 341         server_info->profile_path = talloc_strdup(server_info, str);
 342         NT_STATUS_HAVE_NO_MEMORY(server_info->profile_path);
 343
 344         str = samdb_result_string(msg, "homeDirectory", "");
 345         server_info->home_directory = talloc_strdup(server_info, str);
 346         NT_STATUS_HAVE_NO_MEMORY(server_info->home_directory);
 347
 348         str = samdb_result_string(msg, "homeDrive", "");
 349         server_info->home_drive = talloc_strdup(server_info, str);
 350         NT_STATUS_HAVE_NO_MEMORY(server_info->home_drive);
 351
 352         server_info->logon_server = talloc_strdup(server_info, netbios_name);
 353         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_server);
 354
 355         server_info->last_logon = samdb_result_nttime(msg, "lastLogon", 0);
 356         server_info->last_logoff = samdb_result_nttime(msg, "lastLogoff", 0);
 357         server_info->acct_expiry = samdb_result_account_expires(msg);
 358         server_info->last_password_change = samdb_result_nttime(msg, "pwdLastSet", 0);
 359
 360         ncname = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", NULL);
 361         if (!ncname) {
 362                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 363         }
 364         server_info->allow_password_change
 365                 = samdb_result_allow_password_change(sam_ctx, mem_ctx,
 366                                                      ncname, msg, "pwdLastSet");
 367         server_info->force_password_change
 368                 = samdb_result_force_password_change(sam_ctx, mem_ctx,
 369                                                      ncname, msg);
 370
 371         server_info->logon_count = samdb_result_uint(msg, "logonCount", 0);
 372         server_info->bad_password_count = samdb_result_uint(msg, "badPwdCount", 0);
 373
 374         domain_dn = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", NULL);
 375
 376         server_info->acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx,
 377                                                           msg, domain_dn);
 378
 379         server_info->user_session_key = user_sess_key;
 380         server_info->lm_session_key = lm_sess_key;
 381
 382         server_info->authenticated = true;
 383
 384         *_server_info = server_info;
 385
 386         return NT_STATUS_OK;
 387 }
 388
 389 NTSTATUS sam_get_results_principal(struct ldb_context *sam_ctx,
 390                                    TALLOC_CTX *mem_ctx, const char *principal,
 391                                    struct ldb_message ***msgs,
 392                                    struct ldb_message ***msgs_domain_ref)
 393 {
 394         struct ldb_dn *user_dn, *domain_dn;
 395         NTSTATUS nt_status;
 396         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 397         int ret;
 398         struct ldb_dn *partitions_basedn = samdb_partitions_dn(sam_ctx, mem_ctx);
 399
 400         if (!tmp_ctx) {
 401                 return NT_STATUS_NO_MEMORY;
 402         }
 403
 404         nt_status = crack_user_principal_name(sam_ctx, tmp_ctx, principal, &user_dn, &domain_dn);
 405         if (!NT_STATUS_IS_OK(nt_status)) {
 406                 talloc_free(tmp_ctx);
 407                 return nt_status;
 408         }
 409
 410         /* grab domain info from the reference */
 411         ret = gendb_search(sam_ctx, tmp_ctx, partitions_basedn, msgs_domain_ref, domain_ref_attrs,
 412                            "(ncName=%s)", ldb_dn_get_linearized(domain_dn));
 413
 414         if (ret != 1) {
 415                 talloc_free(tmp_ctx);
 416                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 417         }
 418
 419         /* pull the user attributes */
 420         ret = gendb_search_dn(sam_ctx, tmp_ctx, user_dn, msgs, user_attrs);
 421         if (ret != 1) {
 422                 talloc_free(tmp_ctx);
 423                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 424         }
 425         talloc_steal(mem_ctx, *msgs);
 426         talloc_steal(mem_ctx, *msgs_domain_ref);
 427         talloc_free(tmp_ctx);
 428
 429         return NT_STATUS_OK;
 430 }
 431
 432 /* Used in the gensec_gssapi and gensec_krb5 server-side code, where the PAC isn't available */
 433 NTSTATUS sam_get_server_info_principal(TALLOC_CTX *mem_ctx,
 434                                        struct tevent_context *event_ctx,
 435                                        struct loadparm_context *lp_ctx,
 436                                        const char *principal,
 437                                        struct auth_serversupplied_info **server_info)
 438 {
 439         NTSTATUS nt_status;
 440         DATA_BLOB user_sess_key = data_blob(NULL, 0);
 441         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
 442
 443         struct ldb_message **msgs;
 444         struct ldb_message **msgs_domain_ref;
 445         struct ldb_context *sam_ctx;
 446
 447         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 448         if (!tmp_ctx) {
 449                 return NT_STATUS_NO_MEMORY;
 450         }
 451
 452         sam_ctx = samdb_connect(tmp_ctx, event_ctx, lp_ctx,
 453                                 system_session(tmp_ctx, lp_ctx));
 454         if (sam_ctx == NULL) {
 455                 talloc_free(tmp_ctx);
 456                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 457         }
 458
 459         nt_status = sam_get_results_principal(sam_ctx, tmp_ctx, principal,
 460                                               &msgs, &msgs_domain_ref);
 461         if (!NT_STATUS_IS_OK(nt_status)) {
 462                 return nt_status;
 463         }
 464
 465         nt_status = authsam_make_server_info(tmp_ctx, sam_ctx,
 466                                              lp_netbios_name(lp_ctx),
 467                                              msgs[0], msgs_domain_ref[0],
 468                                              user_sess_key, lm_sess_key,
 469                                              server_info);
 470         if (NT_STATUS_IS_OK(nt_status)) {
 471                 talloc_steal(mem_ctx, *server_info);
 472         }
 473         talloc_free(tmp_ctx);
 474         return nt_status;
 475 }