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 {
 149         uint16_t acct_flags;
 150         const char *workstation_list;
 151         NTTIME acct_expiry;
 152         NTTIME must_change_time;
 153
 154         struct ldb_dn *domain_dn = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", ldb_dn_new(mem_ctx, sam_ctx, NULL));
 155
 156         NTTIME now;
 157         DEBUG(4,("authsam_account_ok: Checking SMB password for user %s\n", name_for_logs));
 158
 159         acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx, msg, domain_dn);
 160
 161         acct_expiry = samdb_result_account_expires(msg);
 162
 163         /* Check for when we must change this password, taking the
 164          * userAccountControl flags into account */
 165         must_change_time = samdb_result_force_password_change(sam_ctx, mem_ctx,
 166                                                               domain_dn, msg);
 167
 168         workstation_list = samdb_result_string(msg, "userWorkstations", NULL);
 169
 170         /* Quit if the account was disabled. */
 171         if (acct_flags & ACB_DISABLED) {
 172                 DEBUG(1,("authsam_account_ok: Account for user '%s' was disabled.\n", name_for_logs));
 173                 return NT_STATUS_ACCOUNT_DISABLED;
 174         }
 175
 176         /* Quit if the account was locked out. */
 177         if (acct_flags & ACB_AUTOLOCK) {
 178                 DEBUG(1,("authsam_account_ok: Account for user %s was locked out.\n", name_for_logs));
 179                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 180         }
 181
 182         /* Test account expire time */
 183         unix_to_nt_time(&now, time(NULL));
 184         if (now > acct_expiry) {
 185                 DEBUG(1,("authsam_account_ok: Account for user '%s' has expired.\n", name_for_logs));
 186                 DEBUG(3,("authsam_account_ok: Account expired at '%s'.\n",
 187                          nt_time_string(mem_ctx, acct_expiry)));
 188                 return NT_STATUS_ACCOUNT_EXPIRED;
 189         }
 190
 191         /* check for immediate expiry "must change at next logon" */
 192         if (must_change_time == 0) {
 193                 DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n",
 194                          name_for_logs));
 195                 return NT_STATUS_PASSWORD_MUST_CHANGE;
 196         }
 197
 198         /* check for expired password */
 199         if (must_change_time < now) {
 200                 DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n",
 201                          name_for_logs));
 202                 DEBUG(1,("sam_account_ok: Password expired at '%s' unix time.\n",
 203                          nt_time_string(mem_ctx, must_change_time)));
 204                 return NT_STATUS_PASSWORD_EXPIRED;
 205         }
 206
 207         /* Test workstation. Workstation list is comma separated. */
 208         if (logon_workstation && workstation_list && *workstation_list) {
 209                 bool invalid_ws = true;
 210                 int i;
 211                 const char **workstations = (const char **)str_list_make(mem_ctx, workstation_list, ",");
 212
 213                 for (i = 0; workstations && workstations[i]; i++) {
 214                         DEBUG(10,("sam_account_ok: checking for workstation match '%s' and '%s'\n",
 215                                   workstations[i], logon_workstation));
 216
 217                         if (strequal(workstations[i], logon_workstation)) {
 218                                 invalid_ws = false;
 219                                 break;
 220                         }
 221                 }
 222
 223                 talloc_free(workstations);
 224
 225                 if (invalid_ws) {
 226                         return NT_STATUS_INVALID_WORKSTATION;
 227                 }
 228         }
 229
 230         if (!logon_hours_ok(msg, name_for_logs)) {
 231                 return NT_STATUS_INVALID_LOGON_HOURS;
 232         }
 233
 234         if (acct_flags & ACB_DOMTRUST) {
 235                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", name_for_logs));
 236                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 237         }
 238
 239         if (!(logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
 240                 if (acct_flags & ACB_SVRTRUST) {
 241                         DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", name_for_logs));
 242                         return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 243                 }
 244         }
 245         if (!(logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
 246                 if (acct_flags & ACB_WSTRUST) {
 247                         DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", name_for_logs));
 248                         return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 249                 }
 250         }
 251
 252         return NT_STATUS_OK;
 253 }
 254
 255 _PUBLIC_ NTSTATUS authsam_make_server_info(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 256                                            const char *netbios_name,
 257                                            struct ldb_message *msg,
 258                                            struct ldb_message *msg_domain_ref,
 259                                            DATA_BLOB user_sess_key, DATA_BLOB lm_sess_key,
 260                                            struct auth_serversupplied_info **_server_info)
 261 {
 262         struct auth_serversupplied_info *server_info;
 263         struct ldb_message **group_msgs;
 264         int group_ret;
 265         const char *group_attrs[3] = { "sAMAccountType", "objectSid", NULL };
 266         /* find list of sids */
 267         struct dom_sid **groupSIDs = NULL;
 268         struct dom_sid *account_sid;
 269         struct dom_sid *primary_group_sid;
 270         struct ldb_dn *domain_dn;
 271         const char *str;
 272         struct ldb_dn *ncname;
 273         int i;
 274         uint_t rid;
 275         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 276
 277         group_ret = gendb_search(sam_ctx,
 278                                  tmp_ctx, NULL, &group_msgs, group_attrs,
 279                                  "(&(member=%s)(sAMAccountType=*))",
 280                                  ldb_dn_get_linearized(msg->dn));
 281         if (group_ret == -1) {
 282                 talloc_free(tmp_ctx);
 283                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 284         }
 285
 286         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 287         NT_STATUS_HAVE_NO_MEMORY(server_info);
 288
 289         if (group_ret > 0) {
 290                 groupSIDs = talloc_array(server_info, struct dom_sid *, group_ret);
 291                 NT_STATUS_HAVE_NO_MEMORY(groupSIDs);
 292         }
 293
 294         /* Need to unroll some nested groups, but not aliases */
 295         for (i = 0; i < group_ret; i++) {
 296                 groupSIDs[i] = samdb_result_dom_sid(groupSIDs,
 297                                                     group_msgs[i], "objectSid");
 298                 NT_STATUS_HAVE_NO_MEMORY(groupSIDs[i]);
 299         }
 300
 301         talloc_free(tmp_ctx);
 302
 303         account_sid = samdb_result_dom_sid(server_info, msg, "objectSid");
 304         NT_STATUS_HAVE_NO_MEMORY(account_sid);
 305
 306         primary_group_sid = dom_sid_dup(server_info, account_sid);
 307         NT_STATUS_HAVE_NO_MEMORY(primary_group_sid);
 308
 309         rid = samdb_result_uint(msg, "primaryGroupID", ~0);
 310         if (rid == ~0) {
 311                 if (group_ret > 0) {
 312                         primary_group_sid = groupSIDs[0];
 313                 } else {
 314                         primary_group_sid = NULL;
 315                 }
 316         } else {
 317                 primary_group_sid->sub_auths[primary_group_sid->num_auths-1] = rid;
 318         }
 319
 320         server_info->account_sid = account_sid;
 321         server_info->primary_group_sid = primary_group_sid;
 322
 323         server_info->n_domain_groups = group_ret;
 324         server_info->domain_groups = groupSIDs;
 325
 326         server_info->account_name = talloc_steal(server_info, samdb_result_string(msg, "sAMAccountName", NULL));
 327
 328         server_info->domain_name = talloc_steal(server_info, samdb_result_string(msg_domain_ref, "nETBIOSName", NULL));
 329
 330         str = samdb_result_string(msg, "displayName", "");
 331         server_info->full_name = talloc_strdup(server_info, str);
 332         NT_STATUS_HAVE_NO_MEMORY(server_info->full_name);
 333
 334         str = samdb_result_string(msg, "scriptPath", "");
 335         server_info->logon_script = talloc_strdup(server_info, str);
 336         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_script);
 337
 338         str = samdb_result_string(msg, "profilePath", "");
 339         server_info->profile_path = talloc_strdup(server_info, str);
 340         NT_STATUS_HAVE_NO_MEMORY(server_info->profile_path);
 341
 342         str = samdb_result_string(msg, "homeDirectory", "");
 343         server_info->home_directory = talloc_strdup(server_info, str);
 344         NT_STATUS_HAVE_NO_MEMORY(server_info->home_directory);
 345
 346         str = samdb_result_string(msg, "homeDrive", "");
 347         server_info->home_drive = talloc_strdup(server_info, str);
 348         NT_STATUS_HAVE_NO_MEMORY(server_info->home_drive);
 349
 350         server_info->logon_server = talloc_strdup(server_info, netbios_name);
 351         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_server);
 352
 353         server_info->last_logon = samdb_result_nttime(msg, "lastLogon", 0);
 354         server_info->last_logoff = samdb_result_nttime(msg, "lastLogoff", 0);
 355         server_info->acct_expiry = samdb_result_account_expires(msg);
 356         server_info->last_password_change = samdb_result_nttime(msg, "pwdLastSet", 0);
 357
 358         ncname = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", NULL);
 359         if (!ncname) {
 360                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 361         }
 362         server_info->allow_password_change
 363                 = samdb_result_allow_password_change(sam_ctx, mem_ctx,
 364                                                      ncname, msg, "pwdLastSet");
 365         server_info->force_password_change
 366                 = samdb_result_force_password_change(sam_ctx, mem_ctx,
 367                                                      ncname, msg);
 368
 369         server_info->logon_count = samdb_result_uint(msg, "logonCount", 0);
 370         server_info->bad_password_count = samdb_result_uint(msg, "badPwdCount", 0);
 371
 372         domain_dn = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", NULL);
 373
 374         server_info->acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx,
 375                                                           msg, domain_dn);
 376
 377         server_info->user_session_key = user_sess_key;
 378         server_info->lm_session_key = lm_sess_key;
 379
 380         server_info->authenticated = true;
 381
 382         *_server_info = server_info;
 383
 384         return NT_STATUS_OK;
 385 }
 386
 387 NTSTATUS sam_get_results_principal(struct ldb_context *sam_ctx,
 388                                    TALLOC_CTX *mem_ctx, const char *principal,
 389                                    struct ldb_message ***msgs,
 390                                    struct ldb_message ***msgs_domain_ref)
 391 {
 392         struct ldb_dn *user_dn, *domain_dn;
 393         NTSTATUS nt_status;
 394         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 395         int ret;
 396         struct ldb_dn *partitions_basedn = samdb_partitions_dn(sam_ctx, mem_ctx);
 397
 398         if (!tmp_ctx) {
 399                 return NT_STATUS_NO_MEMORY;
 400         }
 401
 402         nt_status = crack_user_principal_name(sam_ctx, tmp_ctx, principal, &user_dn, &domain_dn);
 403         if (!NT_STATUS_IS_OK(nt_status)) {
 404                 talloc_free(tmp_ctx);
 405                 return nt_status;
 406         }
 407
 408         /* grab domain info from the reference */
 409         ret = gendb_search(sam_ctx, tmp_ctx, partitions_basedn, msgs_domain_ref, domain_ref_attrs,
 410                            "(ncName=%s)", ldb_dn_get_linearized(domain_dn));
 411
 412         if (ret != 1) {
 413                 talloc_free(tmp_ctx);
 414                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 415         }
 416
 417         /* pull the user attributes */
 418         ret = gendb_search_dn(sam_ctx, tmp_ctx, user_dn, msgs, user_attrs);
 419         if (ret != 1) {
 420                 talloc_free(tmp_ctx);
 421                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 422         }
 423         talloc_steal(mem_ctx, *msgs);
 424         talloc_steal(mem_ctx, *msgs_domain_ref);
 425         talloc_free(tmp_ctx);
 426
 427         return NT_STATUS_OK;
 428 }
 429
 430 /* Used in the gensec_gssapi and gensec_krb5 server-side code, where the PAC isn't available */
 431 NTSTATUS sam_get_server_info_principal(TALLOC_CTX *mem_ctx,
 432                                        struct event_context *event_ctx,
 433                                        struct loadparm_context *lp_ctx,
 434                                        const char *principal,
 435                                        struct auth_serversupplied_info **server_info)
 436 {
 437         NTSTATUS nt_status;
 438         DATA_BLOB user_sess_key = data_blob(NULL, 0);
 439         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
 440
 441         struct ldb_message **msgs;
 442         struct ldb_message **msgs_domain_ref;
 443         struct ldb_context *sam_ctx;
 444
 445         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 446         if (!tmp_ctx) {
 447                 return NT_STATUS_NO_MEMORY;
 448         }
 449
 450         sam_ctx = samdb_connect(tmp_ctx, event_ctx, lp_ctx,
 451                                 system_session(tmp_ctx, lp_ctx));
 452         if (sam_ctx == NULL) {
 453                 talloc_free(tmp_ctx);
 454                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 455         }
 456
 457         nt_status = sam_get_results_principal(sam_ctx, tmp_ctx, principal,
 458                                               &msgs, &msgs_domain_ref);
 459         if (!NT_STATUS_IS_OK(nt_status)) {
 460                 return nt_status;
 461         }
 462
 463         nt_status = authsam_make_server_info(tmp_ctx, sam_ctx,
 464                                              lp_netbios_name(lp_ctx),
 465                                              msgs[0], msgs_domain_ref[0],
 466                                              user_sess_key, lm_sess_key,
 467                                              server_info);
 468         if (NT_STATUS_IS_OK(nt_status)) {
 469                 talloc_steal(mem_ctx, *server_info);
 470         }
 471         talloc_free(tmp_ctx);
 472         return nt_status;
 473 }