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