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