source3/auth/auth_sam.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   4    Copyright (C) Andrew Tridgell              1992-2000
   5    Copyright (C) Luke Kenneth Casson Leighton 1996-2000
   6    Copyright (C) Andrew Bartlett              2001-2003
   7    Copyright (C) Gerald Carter                2003
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "../libcli/auth/libcli_auth.h"
  25
  26 #undef DBGC_CLASS
  27 #define DBGC_CLASS DBGC_AUTH
  28
  29 /****************************************************************************
  30  Do a specific test for an smb password being correct, given a smb_password and
  31  the lanman and NT responses.
  32 ****************************************************************************/
  33
  34 static NTSTATUS sam_password_ok(const struct auth_context *auth_context,
  35                                 TALLOC_CTX *mem_ctx,
  36                                 struct samu *sampass,
  37                                 const auth_usersupplied_info *user_info,
  38                                 DATA_BLOB *user_sess_key,
  39                                 DATA_BLOB *lm_sess_key)
  40 {
  41         uint32 acct_ctrl;
  42         const uint8 *lm_pw, *nt_pw;
  43         struct samr_Password _lm_hash, _nt_hash, _client_lm_hash, _client_nt_hash;
  44         struct samr_Password *lm_hash = NULL;
  45         struct samr_Password *nt_hash = NULL;
  46         struct samr_Password *client_lm_hash = NULL;
  47         struct samr_Password *client_nt_hash = NULL;
  48         const char *username = pdb_get_username(sampass);
  49
  50         *user_sess_key = data_blob_null;
  51         *lm_sess_key = data_blob_null;
  52
  53         acct_ctrl = pdb_get_acct_ctrl(sampass);
  54         if (acct_ctrl & ACB_PWNOTREQ) {
  55                 if (lp_null_passwords()) {
  56                         DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", username));
  57                         return NT_STATUS_OK;
  58                 } else {
  59                         DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", username));
  60                         return NT_STATUS_LOGON_FAILURE;
  61                 }
  62         }
  63
  64         lm_pw = pdb_get_lanman_passwd(sampass);
  65         nt_pw = pdb_get_nt_passwd(sampass);
  66
  67         if (lm_pw) {
  68                 memcpy(_lm_hash.hash, lm_pw, sizeof(_lm_hash.hash));
  69                 lm_hash = &_lm_hash;
  70         }
  71         if (nt_pw) {
  72                 memcpy(_nt_hash.hash, nt_pw, sizeof(_nt_hash.hash));
  73                 nt_hash = &_nt_hash;
  74         }
  75         if (user_info->lm_interactive_pwd.data && sizeof(_client_lm_hash.hash) == user_info->lm_interactive_pwd.length) {
  76                 memcpy(_client_lm_hash.hash, user_info->lm_interactive_pwd.data, sizeof(_lm_hash.hash));
  77                 client_lm_hash = &_client_lm_hash;
  78         }
  79         if (user_info->nt_interactive_pwd.data && sizeof(_client_nt_hash.hash) == user_info->nt_interactive_pwd.length) {
  80                 memcpy(_client_nt_hash.hash, user_info->nt_interactive_pwd.data, sizeof(_nt_hash.hash));
  81                 client_nt_hash = &_client_nt_hash;
  82         }
  83
  84         if (client_lm_hash || client_nt_hash) {
  85                 *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
  86                 if (!user_sess_key->data) {
  87                         return NT_STATUS_NO_MEMORY;
  88                 }
  89                 SMBsesskeygen_ntv1(nt_pw, user_sess_key->data);
  90                 return hash_password_check(mem_ctx, lp_lanman_auth(),
  91                                            client_lm_hash,
  92                                            client_nt_hash,
  93                                            username,
  94                                            lm_hash,
  95                                            nt_hash);
  96         } else {
  97                 return ntlm_password_check(mem_ctx, lp_lanman_auth(),
  98                                            lp_ntlm_auth(),
  99                                            user_info->logon_parameters,
 100                                            &auth_context->challenge,
 101                                            &user_info->lm_resp, &user_info->nt_resp,
 102                                            username,
 103                                            user_info->smb_name,
 104                                            user_info->client_domain,
 105                                            lm_hash,
 106                                            nt_hash,
 107                                            user_sess_key, lm_sess_key);
 108         }
 109 }
 110
 111 /****************************************************************************
 112  Check if a user is allowed to logon at this time. Note this is the
 113  servers local time, as logon hours are just specified as a weekly
 114  bitmask.
 115 ****************************************************************************/
 116
 117 static bool logon_hours_ok(struct samu *sampass)
 118 {
 119         /* In logon hours first bit is Sunday from 12AM to 1AM */
 120         const uint8 *hours;
 121         struct tm *utctime;
 122         time_t lasttime;
 123         const char *asct;
 124         uint8 bitmask, bitpos;
 125
 126         hours = pdb_get_hours(sampass);
 127         if (!hours) {
 128                 DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n",pdb_get_username(sampass)));
 129                 return True;
 130         }
 131
 132         lasttime = time(NULL);
 133         utctime = gmtime(&lasttime);
 134         if (!utctime) {
 135                 DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n",
 136                         pdb_get_username(sampass) ));
 137                 return False;
 138         }
 139
 140         /* find the corresponding byte and bit */
 141         bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
 142         bitmask = 1 << (bitpos % 8);
 143
 144         if (! (hours[bitpos/8] & bitmask)) {
 145                 struct tm *t = localtime(&lasttime);
 146                 if (!t) {
 147                         asct = "INVALID TIME";
 148                 } else {
 149                         asct = asctime(t);
 150                         if (!asct) {
 151                                 asct = "INVALID TIME";
 152                         }
 153                 }
 154
 155                 DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to "
 156                           "logon at this time (%s).\n",
 157                           pdb_get_username(sampass), asct ));
 158                 return False;
 159         }
 160
 161         asct = asctime(utctime);
 162         DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
 163                 pdb_get_username(sampass), asct ? asct : "UNKNOWN TIME" ));
 164
 165         return True;
 166 }
 167
 168 /****************************************************************************
 169  Do a specific test for a struct samu being valid for this connection
 170  (ie not disabled, expired and the like).
 171 ****************************************************************************/
 172
 173 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
 174                                struct samu *sampass,
 175                                const auth_usersupplied_info *user_info)
 176 {
 177         uint32  acct_ctrl = pdb_get_acct_ctrl(sampass);
 178         char *workstation_list;
 179         time_t kickoff_time;
 180
 181         DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
 182
 183         /* Quit if the account was disabled. */
 184         if (acct_ctrl & ACB_DISABLED) {
 185                 DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
 186                 return NT_STATUS_ACCOUNT_DISABLED;
 187         }
 188
 189         /* Quit if the account was locked out. */
 190         if (acct_ctrl & ACB_AUTOLOCK) {
 191                 DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", pdb_get_username(sampass)));
 192                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 193         }
 194
 195         /* Quit if the account is not allowed to logon at this time. */
 196         if (! logon_hours_ok(sampass)) {
 197                 return NT_STATUS_INVALID_LOGON_HOURS;
 198         }
 199
 200         /* Test account expire time */
 201
 202         kickoff_time = pdb_get_kickoff_time(sampass);
 203         if (kickoff_time != 0 && time(NULL) > kickoff_time) {
 204                 DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", pdb_get_username(sampass)));
 205                 DEBUG(3,("sam_account_ok: Account expired at '%ld' unix time.\n", (long)kickoff_time));
 206                 return NT_STATUS_ACCOUNT_EXPIRED;
 207         }
 208
 209         if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP) && !(pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ)) {
 210                 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
 211                 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
 212
 213                 /* check for immediate expiry "must change at next logon"
 214                  * for a user account. */
 215                 if (((acct_ctrl & (ACB_WSTRUST|ACB_SVRTRUST)) == 0) && (last_set_time == 0)) {
 216                         DEBUG(1,("sam_account_ok: Account for user '%s' password must change!\n", pdb_get_username(sampass)));
 217                         return NT_STATUS_PASSWORD_MUST_CHANGE;
 218                 }
 219
 220                 /* check for expired password */
 221                 if (must_change_time < time(NULL) && must_change_time != 0) {
 222                         DEBUG(1,("sam_account_ok: Account for user '%s' password expired!\n", pdb_get_username(sampass)));
 223                         DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", http_timestring(talloc_tos(), must_change_time), (long)must_change_time));
 224                         return NT_STATUS_PASSWORD_EXPIRED;
 225                 }
 226         }
 227
 228         /* Test workstation. Workstation list is comma separated. */
 229
 230         workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
 231         if (!workstation_list)
 232                 return NT_STATUS_NO_MEMORY;
 233
 234         if (*workstation_list) {
 235                 bool invalid_ws = True;
 236                 char *tok = NULL;
 237                 const char *s = workstation_list;
 238                 char *machine_name = talloc_asprintf(mem_ctx, "%s$", user_info->wksta_name);
 239
 240                 if (machine_name == NULL)
 241                         return NT_STATUS_NO_MEMORY;
 242
 243                 while (next_token_talloc(mem_ctx, &s, &tok, ",")) {
 244                         DEBUG(10,("sam_account_ok: checking for workstation match %s and %s\n",
 245                                   tok, user_info->wksta_name));
 246                         if(strequal(tok, user_info->wksta_name)) {
 247                                 invalid_ws = False;
 248                                 break;
 249                         }
 250                         if (tok[0] == '+') {
 251                                 DEBUG(10,("sam_account_ok: checking for workstation %s in group: %s\n",
 252                                         machine_name, tok + 1));
 253                                 if (user_in_group(machine_name, tok + 1)) {
 254                                         invalid_ws = False;
 255                                         break;
 256                                 }
 257                         }
 258                         TALLOC_FREE(tok);
 259                 }
 260                 TALLOC_FREE(tok);
 261                 TALLOC_FREE(machine_name);
 262
 263                 if (invalid_ws)
 264                         return NT_STATUS_INVALID_WORKSTATION;
 265         }
 266
 267         if (acct_ctrl & ACB_DOMTRUST) {
 268                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
 269                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 270         }
 271
 272         if (acct_ctrl & ACB_SVRTRUST) {
 273                 if (!(user_info->logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
 274                         DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
 275                         return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 276                 }
 277         }
 278
 279         if (acct_ctrl & ACB_WSTRUST) {
 280                 if (!(user_info->logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
 281                         DEBUG(2,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
 282                         return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 283                 }
 284         }
 285         return NT_STATUS_OK;
 286 }
 287
 288 /****************************************************************************
 289 check if a username/password is OK assuming the password is a 24 byte
 290 SMB hash supplied in the user_info structure
 291 return an NT_STATUS constant.
 292 ****************************************************************************/
 293
 294 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
 295                                    void *my_private_data,
 296                                    TALLOC_CTX *mem_ctx,
 297                                    const auth_usersupplied_info *user_info,
 298                                    auth_serversupplied_info **server_info)
 299 {
 300         struct samu *sampass=NULL;
 301         bool ret;
 302         NTSTATUS nt_status;
 303         NTSTATUS update_login_attempts_status;
 304         DATA_BLOB user_sess_key = data_blob_null;
 305         DATA_BLOB lm_sess_key = data_blob_null;
 306         bool updated_autolock = False, updated_badpw = False;
 307
 308         if (!user_info || !auth_context) {
 309                 return NT_STATUS_UNSUCCESSFUL;
 310         }
 311
 312         /* the returned struct gets kept on the server_info, by means
 313            of a steal further down */
 314
 315         sampass = samu_new(mem_ctx);
 316         if (sampass == NULL) {
 317                 return NT_STATUS_NO_MEMORY;
 318         }
 319
 320         /* get the account information */
 321
 322         become_root();
 323         ret = pdb_getsampwnam(sampass, user_info->internal_username);
 324         unbecome_root();
 325
 326         if (ret == False) {
 327                 DEBUG(3,("check_sam_security: Couldn't find user '%s' in "
 328                          "passdb.\n", user_info->internal_username));
 329                 TALLOC_FREE(sampass);
 330                 return NT_STATUS_NO_SUCH_USER;
 331         }
 332
 333         /* see if autolock flag needs to be updated */
 334         if (pdb_get_acct_ctrl(sampass) & ACB_NORMAL)
 335                 pdb_update_autolock_flag(sampass, &updated_autolock);
 336         /* Quit if the account was locked out. */
 337         if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) {
 338                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", pdb_get_username(sampass)));
 339                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 340         }
 341
 342         nt_status = sam_password_ok(auth_context, mem_ctx, sampass,
 343                                     user_info, &user_sess_key, &lm_sess_key);
 344
 345         /* Notify passdb backend of login success/failure. If not
 346            NT_STATUS_OK the backend doesn't like the login */
 347
 348         update_login_attempts_status = pdb_update_login_attempts(sampass, NT_STATUS_IS_OK(nt_status));
 349
 350         if (!NT_STATUS_IS_OK(nt_status)) {
 351                 if (NT_STATUS_EQUAL(nt_status,NT_STATUS_WRONG_PASSWORD) &&
 352                     pdb_get_acct_ctrl(sampass) &ACB_NORMAL &&
 353                     NT_STATUS_IS_OK(update_login_attempts_status))
 354                 {
 355                         pdb_increment_bad_password_count(sampass);
 356                         updated_badpw = True;
 357                 } else {
 358                         pdb_update_bad_password_count(sampass,
 359                                                       &updated_badpw);
 360                 }
 361                 if (updated_autolock || updated_badpw){
 362                         become_root();
 363                         if(!NT_STATUS_IS_OK(pdb_update_sam_account(sampass)))
 364                                 DEBUG(1, ("Failed to modify entry.\n"));
 365                         unbecome_root();
 366                 }
 367                 data_blob_free(&user_sess_key);
 368                 data_blob_free(&lm_sess_key);
 369                 TALLOC_FREE(sampass);
 370                 return nt_status;
 371         }
 372
 373         if ((pdb_get_acct_ctrl(sampass) & ACB_NORMAL) &&
 374             (pdb_get_bad_password_count(sampass) > 0)){
 375                 pdb_set_bad_password_count(sampass, 0, PDB_CHANGED);
 376                 pdb_set_bad_password_time(sampass, 0, PDB_CHANGED);
 377                 updated_badpw = True;
 378         }
 379
 380         if (updated_autolock || updated_badpw){
 381                 become_root();
 382                 if(!NT_STATUS_IS_OK(pdb_update_sam_account(sampass)))
 383                         DEBUG(1, ("Failed to modify entry.\n"));
 384                 unbecome_root();
 385         }
 386
 387         nt_status = sam_account_ok(mem_ctx, sampass, user_info);
 388
 389         if (!NT_STATUS_IS_OK(nt_status)) {
 390                 TALLOC_FREE(sampass);
 391                 data_blob_free(&user_sess_key);
 392                 data_blob_free(&lm_sess_key);
 393                 return nt_status;
 394         }
 395
 396         become_root();
 397         nt_status = make_server_info_sam(server_info, sampass);
 398         unbecome_root();
 399
 400         if (!NT_STATUS_IS_OK(nt_status)) {
 401                 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
 402                 data_blob_free(&user_sess_key);
 403                 data_blob_free(&lm_sess_key);
 404                 return nt_status;
 405         }
 406
 407         (*server_info)->user_session_key =
 408                 data_blob_talloc(*server_info, user_sess_key.data,
 409                                  user_sess_key.length);
 410         data_blob_free(&user_sess_key);
 411
 412         (*server_info)->lm_session_key =
 413                 data_blob_talloc(*server_info, lm_sess_key.data,
 414                                  lm_sess_key.length);
 415         data_blob_free(&lm_sess_key);
 416
 417         (*server_info)->nss_token |= user_info->was_mapped;
 418
 419         return nt_status;
 420 }
 421
 422 /* module initialisation */
 423 static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 424 {
 425         if (!make_auth_methods(auth_context, auth_method)) {
 426                 return NT_STATUS_NO_MEMORY;
 427         }
 428
 429         (*auth_method)->auth = check_sam_security;
 430         (*auth_method)->name = "sam_ignoredomain";
 431         return NT_STATUS_OK;
 432 }
 433
 434
 435 /****************************************************************************
 436 Check SAM security (above) but with a few extra checks.
 437 ****************************************************************************/
 438
 439 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
 440                                          void *my_private_data,
 441                                          TALLOC_CTX *mem_ctx,
 442                                          const auth_usersupplied_info *user_info,
 443                                          auth_serversupplied_info **server_info)
 444 {
 445         bool is_local_name, is_my_domain;
 446
 447         if (!user_info || !auth_context) {
 448                 return NT_STATUS_LOGON_FAILURE;
 449         }
 450
 451         is_local_name = is_myname(user_info->domain);
 452         is_my_domain  = strequal(user_info->domain, lp_workgroup());
 453
 454         /* check whether or not we service this domain/workgroup name */
 455
 456         switch ( lp_server_role() ) {
 457                 case ROLE_STANDALONE:
 458                 case ROLE_DOMAIN_MEMBER:
 459                         if ( !is_local_name ) {
 460                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names (%s)\n",
 461                                         user_info->domain, (lp_server_role() == ROLE_DOMAIN_MEMBER
 462                                         ? "ROLE_DOMAIN_MEMBER" : "ROLE_STANDALONE") ));
 463                                 return NT_STATUS_NOT_IMPLEMENTED;
 464                         }
 465                 case ROLE_DOMAIN_PDC:
 466                 case ROLE_DOMAIN_BDC:
 467                         if ( !is_local_name && !is_my_domain ) {
 468                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names or domain name (DC)\n",
 469                                         user_info->domain));
 470                                 return NT_STATUS_NOT_IMPLEMENTED;
 471                         }
 472                 default: /* name is ok */
 473                         break;
 474         }
 475
 476         return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
 477 }
 478
 479 /* module initialisation */
 480 static NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 481 {
 482         if (!make_auth_methods(auth_context, auth_method)) {
 483                 return NT_STATUS_NO_MEMORY;
 484         }
 485
 486         (*auth_method)->auth = check_samstrict_security;
 487         (*auth_method)->name = "sam";
 488         return NT_STATUS_OK;
 489 }
 490
 491 NTSTATUS auth_sam_init(void)
 492 {
 493         smb_register_auth(AUTH_INTERFACE_VERSION, "sam", auth_init_sam);
 494         smb_register_auth(AUTH_INTERFACE_VERSION, "sam_ignoredomain", auth_init_sam_ignoredomain);
 495         return NT_STATUS_OK;
 496 }