source/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 2 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, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.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                                 SAM_ACCOUNT *sampass,
  37                                 const auth_usersupplied_info *user_info,
  38                                 DATA_BLOB *user_sess_key,
  39                                 DATA_BLOB *lm_sess_key)
  40 {
  41         uint16 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.str,
  64                                    user_info->client_domain.str,
  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(SAM_ACCOUNT *sampass)
  75 {
  76         /* In logon hours first bit is Sunday from 12AM to 1AM */
  77         extern struct timeval smb_last_time;
  78         const uint8 *hours;
  79         struct tm *utctime;
  80         uint8 bitmask, bitpos;
  81
  82         hours = pdb_get_hours(sampass);
  83         if (!hours) {
  84                 DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n",pdb_get_username(sampass)));
  85                 return True;
  86         }
  87
  88         utctime = localtime(&smb_last_time.tv_sec);
  89
  90         /* find the corresponding byte and bit */
  91         bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
  92         bitmask = 1 << (bitpos % 8);
  93
  94         if (! (hours[bitpos/8] & bitmask)) {
  95                 DEBUG(1,("logon_hours_ok: Account for user %s not allowed to logon at this time (%s).\n",
  96                         pdb_get_username(sampass), asctime(utctime) ));
  97                 return False;
  98         }
  99
 100         DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
 101                 pdb_get_username(sampass), asctime(utctime) ));
 102
 103         return True;
 104 }
 105
 106 /****************************************************************************
 107  Do a specific test for a SAM_ACCOUNT being vaild for this connection
 108  (ie not disabled, expired and the like).
 109 ****************************************************************************/
 110
 111 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
 112                                SAM_ACCOUNT *sampass,
 113                                const auth_usersupplied_info *user_info)
 114 {
 115         uint16  acct_ctrl = pdb_get_acct_ctrl(sampass);
 116         char *workstation_list;
 117         time_t kickoff_time;
 118
 119         DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
 120
 121         /* Quit if the account was disabled. */
 122         if (acct_ctrl & ACB_DISABLED) {
 123                 DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
 124                 return NT_STATUS_ACCOUNT_DISABLED;
 125         }
 126
 127         /* Quit if the account was locked out. */
 128         if (acct_ctrl & ACB_AUTOLOCK) {
 129                 DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", pdb_get_username(sampass)));
 130                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 131         }
 132
 133         /* Quit if the account is not allowed to logon at this time. */
 134         if (! logon_hours_ok(sampass)) {
 135                 return NT_STATUS_INVALID_LOGON_HOURS;
 136         }
 137
 138         /* Test account expire time */
 139
 140         kickoff_time = pdb_get_kickoff_time(sampass);
 141         if (kickoff_time != 0 && time(NULL) > kickoff_time) {
 142                 DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", pdb_get_username(sampass)));
 143                 DEBUG(3,("sam_account_ok: Account expired at '%ld' unix time.\n", (long)kickoff_time));
 144                 return NT_STATUS_ACCOUNT_EXPIRED;
 145         }
 146
 147         if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
 148                 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
 149                 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
 150
 151                 /* check for immediate expiry "must change at next logon" */
 152                 if (must_change_time == 0 && last_set_time != 0) {
 153                         DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
 154                         return NT_STATUS_PASSWORD_MUST_CHANGE;
 155                 }
 156
 157                 /* check for expired password */
 158                 if (must_change_time < time(NULL) && must_change_time != 0) {
 159                         DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
 160                         DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
 161                         return NT_STATUS_PASSWORD_EXPIRED;
 162                 }
 163         }
 164
 165         /* Test workstation. Workstation list is comma separated. */
 166
 167         workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
 168         if (!workstation_list)
 169                 return NT_STATUS_NO_MEMORY;
 170
 171         if (*workstation_list) {
 172                 BOOL invalid_ws = True;
 173                 fstring tok;
 174                 const char *s = workstation_list;
 175
 176                 const char *machine_name = talloc_asprintf(mem_ctx, "%s$", user_info->wksta_name.str);
 177                 if (machine_name == NULL)
 178                         return NT_STATUS_NO_MEMORY;
 179
 180
 181                 while (next_token(&s, tok, ",", sizeof(tok))) {
 182                         DEBUG(10,("sam_account_ok: checking for workstation match %s and %s (len=%d)\n",
 183                                   tok, user_info->wksta_name.str, user_info->wksta_name.len));
 184                         if(strequal(tok, user_info->wksta_name.str)) {
 185                                 invalid_ws = False;
 186                                 break;
 187                         }
 188                         if (tok[0] == '+') {
 189                                 DEBUG(10,("sam_account_ok: checking for workstation %s in group: %s\n",
 190                                         machine_name, tok + 1));
 191                                 if (user_in_group_list(machine_name, tok + 1, NULL, 0)) {
 192                                         invalid_ws = False;
 193                                         break;
 194                                 }
 195                         }
 196                 }
 197
 198                 if (invalid_ws)
 199                         return NT_STATUS_INVALID_WORKSTATION;
 200         }
 201
 202         if (acct_ctrl & ACB_DOMTRUST) {
 203                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
 204                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 205         }
 206
 207         if (acct_ctrl & ACB_SVRTRUST) {
 208                 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
 209                 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 210         }
 211
 212         if (acct_ctrl & ACB_WSTRUST) {
 213                 DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
 214                 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 215         }
 216
 217         return NT_STATUS_OK;
 218 }
 219
 220 /****************************************************************************
 221 check if a username/password is OK assuming the password is a 24 byte
 222 SMB hash supplied in the user_info structure
 223 return an NT_STATUS constant.
 224 ****************************************************************************/
 225
 226 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
 227                                    void *my_private_data,
 228                                    TALLOC_CTX *mem_ctx,
 229                                    const auth_usersupplied_info *user_info,
 230                                    auth_serversupplied_info **server_info)
 231 {
 232         SAM_ACCOUNT *sampass=NULL;
 233         BOOL ret;
 234         NTSTATUS nt_status;
 235         NTSTATUS update_login_attempts_status;
 236         DATA_BLOB user_sess_key = data_blob(NULL, 0);
 237         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
 238         BOOL updated_autolock = False, updated_badpw = False;
 239
 240         if (!user_info || !auth_context) {
 241                 return NT_STATUS_UNSUCCESSFUL;
 242         }
 243
 244         /* Can't use the talloc version here, because the returned struct gets
 245            kept on the server_info */
 246         if (!NT_STATUS_IS_OK(nt_status = pdb_init_sam(&sampass))) {
 247                 return nt_status;
 248         }
 249
 250         /* get the account information */
 251
 252         become_root();
 253         ret = pdb_getsampwnam(sampass, user_info->internal_username.str);
 254         unbecome_root();
 255
 256         if (ret == False) {
 257                 DEBUG(3,("check_sam_security: Couldn't find user '%s' in passdb.\n", user_info->internal_username.str));
 258                 pdb_free_sam(&sampass);
 259                 return NT_STATUS_NO_SUCH_USER;
 260         }
 261
 262         /* see if autolock flag needs to be updated */
 263         if (pdb_get_acct_ctrl(sampass) & ACB_NORMAL)
 264                 pdb_update_autolock_flag(sampass, &updated_autolock);
 265         /* Quit if the account was locked out. */
 266         if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) {
 267                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", pdb_get_username(sampass)));
 268                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 269         }
 270
 271         nt_status = sam_password_ok(auth_context, mem_ctx, sampass,
 272                                     user_info, &user_sess_key, &lm_sess_key);
 273
 274         /* Notify passdb backend of login success/failure. If not NT_STATUS_OK the backend doesn't like the login */
 275         update_login_attempts_status = pdb_update_login_attempts(sampass, NT_STATUS_IS_OK(nt_status));
 276         if (!NT_STATUS_IS_OK(update_login_attempts_status))
 277                 nt_status = update_login_attempts_status;
 278
 279         if (!NT_STATUS_IS_OK(nt_status)) {
 280                 if (NT_STATUS_EQUAL(nt_status,NT_STATUS_WRONG_PASSWORD) &&
 281                     pdb_get_acct_ctrl(sampass) &ACB_NORMAL) {
 282                         pdb_increment_bad_password_count(sampass);
 283                         updated_badpw = True;
 284                 } else {
 285                         pdb_update_bad_password_count(sampass,
 286                                                       &updated_badpw);
 287                 }
 288                 if (updated_autolock || updated_badpw){
 289                         become_root();
 290                         if(!pdb_update_sam_account(sampass))
 291                                 DEBUG(1, ("Failed to modify entry.\n"));
 292                         unbecome_root();
 293                 }
 294                 data_blob_free(&user_sess_key);
 295                 data_blob_free(&lm_sess_key);
 296                 pdb_free_sam(&sampass);
 297                 return nt_status;
 298         }
 299
 300         if ((pdb_get_acct_ctrl(sampass) & ACB_NORMAL) &&
 301             (pdb_get_bad_password_count(sampass) > 0)){
 302                 pdb_set_bad_password_count(sampass, 0, PDB_CHANGED);
 303                 pdb_set_bad_password_time(sampass, 0, PDB_CHANGED);
 304                 updated_badpw = True;
 305         }
 306
 307         if (updated_autolock || updated_badpw){
 308                 become_root();
 309                 if(!pdb_update_sam_account(sampass))
 310                         DEBUG(1, ("Failed to modify entry.\n"));
 311                 unbecome_root();
 312         }
 313
 314         nt_status = sam_account_ok(mem_ctx, sampass, user_info);
 315
 316         if (!NT_STATUS_IS_OK(nt_status)) {
 317                 pdb_free_sam(&sampass);
 318                 data_blob_free(&user_sess_key);
 319                 data_blob_free(&lm_sess_key);
 320                 return nt_status;
 321         }
 322
 323         if (!NT_STATUS_IS_OK(nt_status = make_server_info_sam(server_info, sampass))) {
 324                 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
 325                 data_blob_free(&user_sess_key);
 326                 data_blob_free(&lm_sess_key);
 327                 return nt_status;
 328         }
 329
 330         (*server_info)->user_session_key = user_sess_key;
 331         (*server_info)->lm_session_key = lm_sess_key;
 332
 333         return nt_status;
 334 }
 335
 336 /* module initialisation */
 337 static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 338 {
 339         if (!make_auth_methods(auth_context, auth_method)) {
 340                 return NT_STATUS_NO_MEMORY;
 341         }
 342
 343         (*auth_method)->auth = check_sam_security;
 344         (*auth_method)->name = "sam_ignoredomain";
 345         return NT_STATUS_OK;
 346 }
 347
 348
 349 /****************************************************************************
 350 Check SAM security (above) but with a few extra checks.
 351 ****************************************************************************/
 352
 353 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
 354                                          void *my_private_data,
 355                                          TALLOC_CTX *mem_ctx,
 356                                          const auth_usersupplied_info *user_info,
 357                                          auth_serversupplied_info **server_info)
 358 {
 359         BOOL is_local_name, is_my_domain;
 360
 361         if (!user_info || !auth_context) {
 362                 return NT_STATUS_LOGON_FAILURE;
 363         }
 364
 365         is_local_name = is_myname(user_info->domain.str);
 366         is_my_domain  = strequal(user_info->domain.str, lp_workgroup());
 367
 368         /* check whether or not we service this domain/workgroup name */
 369
 370         switch ( lp_server_role() ) {
 371                 case ROLE_STANDALONE:
 372                 case ROLE_DOMAIN_MEMBER:
 373                         if ( !is_local_name ) {
 374                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names (%s)\n",
 375                                         user_info->domain.str, (lp_server_role() == ROLE_DOMAIN_MEMBER
 376                                         ? "ROLE_DOMAIN_MEMBER" : "ROLE_STANDALONE") ));
 377                                 return NT_STATUS_NOT_IMPLEMENTED;
 378                         }
 379                 case ROLE_DOMAIN_PDC:
 380                 case ROLE_DOMAIN_BDC:
 381                         if ( !is_local_name && !is_my_domain ) {
 382                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names or domain name (DC)\n",
 383                                         user_info->domain.str));
 384                                 return NT_STATUS_NOT_IMPLEMENTED;
 385                         }
 386                 default: /* name is ok */
 387                         break;
 388         }
 389
 390         return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
 391 }
 392
 393 /* module initialisation */
 394 static NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 395 {
 396         if (!make_auth_methods(auth_context, auth_method)) {
 397                 return NT_STATUS_NO_MEMORY;
 398         }
 399
 400         (*auth_method)->auth = check_samstrict_security;
 401         (*auth_method)->name = "sam";
 402         return NT_STATUS_OK;
 403 }
 404
 405 NTSTATUS auth_sam_init(void)
 406 {
 407         smb_register_auth(AUTH_INTERFACE_VERSION, "sam", auth_init_sam);
 408         smb_register_auth(AUTH_INTERFACE_VERSION, "sam_ignoredomain", auth_init_sam_ignoredomain);
 409         return NT_STATUS_OK;
 410 }