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 extern struct timeval smb_last_time;
  27
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_AUTH
  30
  31 /****************************************************************************
  32  Do a specific test for an smb password being correct, given a smb_password and
  33  the lanman and NT responses.
  34 ****************************************************************************/
  35
  36 static NTSTATUS sam_password_ok(const struct auth_context *auth_context,
  37                                 TALLOC_CTX *mem_ctx,
  38                                 SAM_ACCOUNT *sampass,
  39                                 const auth_usersupplied_info *user_info,
  40                                 DATA_BLOB *user_sess_key,
  41                                 DATA_BLOB *lm_sess_key)
  42 {
  43         uint16 acct_ctrl;
  44         const uint8 *lm_pw, *nt_pw;
  45         const char *username = pdb_get_username(sampass);
  46
  47         acct_ctrl = pdb_get_acct_ctrl(sampass);
  48         if (acct_ctrl & ACB_PWNOTREQ) {
  49                 if (lp_null_passwords()) {
  50                         DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", username));
  51                         return NT_STATUS_OK;
  52                 } else {
  53                         DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", username));
  54                         return NT_STATUS_LOGON_FAILURE;
  55                 }
  56         }
  57
  58         lm_pw = pdb_get_lanman_passwd(sampass);
  59         nt_pw = pdb_get_nt_passwd(sampass);
  60
  61         return ntlm_password_check(mem_ctx, &auth_context->challenge,
  62                                    &user_info->lm_resp, &user_info->nt_resp,
  63                                    &user_info->lm_interactive_pwd, &user_info->nt_interactive_pwd,
  64                                    username,
  65                                    user_info->smb_name.str,
  66                                    user_info->client_domain.str,
  67                                    lm_pw, nt_pw, user_sess_key, lm_sess_key);
  68 }
  69
  70 /****************************************************************************
  71  Check if a user is allowed to logon at this time. Note this is the
  72  servers local time, as logon hours are just specified as a weekly
  73  bitmask.
  74 ****************************************************************************/
  75
  76 static BOOL logon_hours_ok(SAM_ACCOUNT *sampass)
  77 {
  78         /* In logon hours first bit is Sunday from 12AM to 1AM */
  79         const uint8 *hours;
  80         struct tm *utctime;
  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         utctime = localtime(&smb_last_time.tv_sec);
  90
  91         /* find the corresponding byte and bit */
  92         bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
  93         bitmask = 1 << (bitpos % 8);
  94
  95         if (! (hours[bitpos/8] & bitmask)) {
  96                 DEBUG(1,("logon_hours_ok: Account for user %s not allowed to logon at this time (%s).\n",
  97                         pdb_get_username(sampass), asctime(utctime) ));
  98                 return False;
  99         }
 100
 101         DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
 102                 pdb_get_username(sampass), asctime(utctime) ));
 103
 104         return True;
 105 }
 106
 107 /****************************************************************************
 108  Do a specific test for a SAM_ACCOUNT being vaild for this connection
 109  (ie not disabled, expired and the like).
 110 ****************************************************************************/
 111
 112 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
 113                                SAM_ACCOUNT *sampass,
 114                                const auth_usersupplied_info *user_info)
 115 {
 116         uint16  acct_ctrl = pdb_get_acct_ctrl(sampass);
 117         char *workstation_list;
 118         time_t kickoff_time;
 119
 120         DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
 121
 122         /* Quit if the account was disabled. */
 123         if (acct_ctrl & ACB_DISABLED) {
 124                 DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
 125                 return NT_STATUS_ACCOUNT_DISABLED;
 126         }
 127
 128         /* Quit if the account was locked out. */
 129         if (acct_ctrl & ACB_AUTOLOCK) {
 130                 DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", pdb_get_username(sampass)));
 131                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 132         }
 133
 134         /* Quit if the account is not allowed to logon at this time. */
 135         if (! logon_hours_ok(sampass)) {
 136                 return NT_STATUS_INVALID_LOGON_HOURS;
 137         }
 138
 139         /* Test account expire time */
 140
 141         kickoff_time = pdb_get_kickoff_time(sampass);
 142         if (kickoff_time != 0 && time(NULL) > kickoff_time) {
 143                 DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", pdb_get_username(sampass)));
 144                 DEBUG(3,("sam_account_ok: Account expired at '%ld' unix time.\n", (long)kickoff_time));
 145                 return NT_STATUS_ACCOUNT_EXPIRED;
 146         }
 147
 148         if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
 149                 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
 150                 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
 151
 152                 /* check for immediate expiry "must change at next logon" */
 153                 if (must_change_time == 0 && last_set_time != 0) {
 154                         DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
 155                         return NT_STATUS_PASSWORD_MUST_CHANGE;
 156                 }
 157
 158                 /* check for expired password */
 159                 if (must_change_time < time(NULL) && must_change_time != 0) {
 160                         DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
 161                         DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
 162                         return NT_STATUS_PASSWORD_EXPIRED;
 163                 }
 164         }
 165
 166         /* Test workstation. Workstation list is comma separated. */
 167
 168         workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
 169         if (!workstation_list)
 170                 return NT_STATUS_NO_MEMORY;
 171
 172         if (*workstation_list) {
 173                 BOOL invalid_ws = True;
 174                 fstring tok;
 175                 const char *s = workstation_list;
 176
 177                 const char *machine_name = talloc_asprintf(mem_ctx, "%s$", user_info->wksta_name.str);
 178                 if (machine_name == NULL)
 179                         return NT_STATUS_NO_MEMORY;
 180
 181
 182                 while (next_token(&s, tok, ",", sizeof(tok))) {
 183                         DEBUG(10,("sam_account_ok: checking for workstation match %s and %s (len=%d)\n",
 184                                   tok, user_info->wksta_name.str, user_info->wksta_name.len));
 185                         if(strequal(tok, user_info->wksta_name.str)) {
 186                                 invalid_ws = False;
 187                                 break;
 188                         }
 189                         if (tok[0] == '+') {
 190                                 DEBUG(10,("sam_account_ok: checking for workstation %s in group: %s\n",
 191                                         machine_name, tok + 1));
 192                                 if (user_in_group_list(machine_name, tok + 1, NULL, 0)) {
 193                                         invalid_ws = False;
 194                                         break;
 195                                 }
 196                         }
 197                 }
 198
 199                 if (invalid_ws)
 200                         return NT_STATUS_INVALID_WORKSTATION;
 201         }
 202
 203         if (acct_ctrl & ACB_DOMTRUST) {
 204                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
 205                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 206         }
 207
 208         if (acct_ctrl & ACB_SVRTRUST) {
 209                 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
 210                 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 211         }
 212
 213         if (acct_ctrl & ACB_WSTRUST) {
 214                 DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
 215                 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 216         }
 217
 218         return NT_STATUS_OK;
 219 }
 220
 221 /****************************************************************************
 222 check if a username/password is OK assuming the password is a 24 byte
 223 SMB hash supplied in the user_info structure
 224 return an NT_STATUS constant.
 225 ****************************************************************************/
 226
 227 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
 228                                    void *my_private_data,
 229                                    TALLOC_CTX *mem_ctx,
 230                                    const auth_usersupplied_info *user_info,
 231                                    auth_serversupplied_info **server_info)
 232 {
 233         SAM_ACCOUNT *sampass=NULL;
 234         BOOL ret;
 235         NTSTATUS nt_status;
 236         NTSTATUS update_login_attempts_status;
 237         DATA_BLOB user_sess_key = data_blob(NULL, 0);
 238         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
 239         BOOL updated_autolock = False, updated_badpw = False;
 240
 241         if (!user_info || !auth_context) {
 242                 return NT_STATUS_UNSUCCESSFUL;
 243         }
 244
 245         /* Can't use the talloc version here, because the returned struct gets
 246            kept on the server_info */
 247         if (!NT_STATUS_IS_OK(nt_status = pdb_init_sam(&sampass))) {
 248                 return nt_status;
 249         }
 250
 251         /* get the account information */
 252
 253         become_root();
 254         ret = pdb_getsampwnam(sampass, user_info->internal_username.str);
 255         unbecome_root();
 256
 257         if (ret == False) {
 258                 DEBUG(3,("check_sam_security: Couldn't find user '%s' in passdb.\n", user_info->internal_username.str));
 259                 pdb_free_sam(&sampass);
 260                 return NT_STATUS_NO_SUCH_USER;
 261         }
 262
 263         /* see if autolock flag needs to be updated */
 264         if (pdb_get_acct_ctrl(sampass) & ACB_NORMAL)
 265                 pdb_update_autolock_flag(sampass, &updated_autolock);
 266         /* Quit if the account was locked out. */
 267         if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) {
 268                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", pdb_get_username(sampass)));
 269                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 270         }
 271
 272         nt_status = sam_password_ok(auth_context, mem_ctx, sampass,
 273                                     user_info, &user_sess_key, &lm_sess_key);
 274
 275         /* Notify passdb backend of login success/failure. If not NT_STATUS_OK the backend doesn't like the login */
 276         update_login_attempts_status = pdb_update_login_attempts(sampass, NT_STATUS_IS_OK(nt_status));
 277         if (!NT_STATUS_IS_OK(update_login_attempts_status))
 278                 nt_status = update_login_attempts_status;
 279
 280         if (!NT_STATUS_IS_OK(nt_status)) {
 281                 if (NT_STATUS_EQUAL(nt_status,NT_STATUS_WRONG_PASSWORD) &&
 282                     pdb_get_acct_ctrl(sampass) &ACB_NORMAL) {
 283                         pdb_increment_bad_password_count(sampass);
 284                         updated_badpw = True;
 285                 } else {
 286                         pdb_update_bad_password_count(sampass,
 287                                                       &updated_badpw);
 288                 }
 289                 if (updated_autolock || updated_badpw){
 290                         become_root();
 291                         if(!pdb_update_sam_account(sampass))
 292                                 DEBUG(1, ("Failed to modify entry.\n"));
 293                         unbecome_root();
 294                 }
 295                 data_blob_free(&user_sess_key);
 296                 data_blob_free(&lm_sess_key);
 297                 pdb_free_sam(&sampass);
 298                 return nt_status;
 299         }
 300
 301         if ((pdb_get_acct_ctrl(sampass) & ACB_NORMAL) &&
 302             (pdb_get_bad_password_count(sampass) > 0)){
 303                 pdb_set_bad_password_count(sampass, 0, PDB_CHANGED);
 304                 pdb_set_bad_password_time(sampass, 0, PDB_CHANGED);
 305                 updated_badpw = True;
 306         }
 307
 308         if (updated_autolock || updated_badpw){
 309                 become_root();
 310                 if(!pdb_update_sam_account(sampass))
 311                         DEBUG(1, ("Failed to modify entry.\n"));
 312                 unbecome_root();
 313         }
 314
 315         nt_status = sam_account_ok(mem_ctx, sampass, user_info);
 316
 317         if (!NT_STATUS_IS_OK(nt_status)) {
 318                 pdb_free_sam(&sampass);
 319                 data_blob_free(&user_sess_key);
 320                 data_blob_free(&lm_sess_key);
 321                 return nt_status;
 322         }
 323
 324         if (!NT_STATUS_IS_OK(nt_status = make_server_info_sam(server_info, sampass))) {
 325                 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
 326                 data_blob_free(&user_sess_key);
 327                 data_blob_free(&lm_sess_key);
 328                 return nt_status;
 329         }
 330
 331         (*server_info)->user_session_key = user_sess_key;
 332         (*server_info)->lm_session_key = lm_sess_key;
 333
 334         return nt_status;
 335 }
 336
 337 /* module initialisation */
 338 static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 339 {
 340         if (!make_auth_methods(auth_context, auth_method)) {
 341                 return NT_STATUS_NO_MEMORY;
 342         }
 343
 344         (*auth_method)->auth = check_sam_security;
 345         (*auth_method)->name = "sam_ignoredomain";
 346         return NT_STATUS_OK;
 347 }
 348
 349
 350 /****************************************************************************
 351 Check SAM security (above) but with a few extra checks.
 352 ****************************************************************************/
 353
 354 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
 355                                          void *my_private_data,
 356                                          TALLOC_CTX *mem_ctx,
 357                                          const auth_usersupplied_info *user_info,
 358                                          auth_serversupplied_info **server_info)
 359 {
 360         BOOL is_local_name, is_my_domain;
 361
 362         if (!user_info || !auth_context) {
 363                 return NT_STATUS_LOGON_FAILURE;
 364         }
 365
 366         is_local_name = is_myname(user_info->domain.str);
 367         is_my_domain  = strequal(user_info->domain.str, lp_workgroup());
 368
 369         /* check whether or not we service this domain/workgroup name */
 370
 371         switch ( lp_server_role() ) {
 372                 case ROLE_STANDALONE:
 373                 case ROLE_DOMAIN_MEMBER:
 374                         if ( !is_local_name ) {
 375                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names (%s)\n",
 376                                         user_info->domain.str, (lp_server_role() == ROLE_DOMAIN_MEMBER
 377                                         ? "ROLE_DOMAIN_MEMBER" : "ROLE_STANDALONE") ));
 378                                 return NT_STATUS_NOT_IMPLEMENTED;
 379                         }
 380                 case ROLE_DOMAIN_PDC:
 381                 case ROLE_DOMAIN_BDC:
 382                         if ( !is_local_name && !is_my_domain ) {
 383                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names or domain name (DC)\n",
 384                                         user_info->domain.str));
 385                                 return NT_STATUS_NOT_IMPLEMENTED;
 386                         }
 387                 default: /* name is ok */
 388                         break;
 389         }
 390
 391         return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
 392 }
 393
 394 /* module initialisation */
 395 static NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 396 {
 397         if (!make_auth_methods(auth_context, auth_method)) {
 398                 return NT_STATUS_NO_MEMORY;
 399         }
 400
 401         (*auth_method)->auth = check_samstrict_security;
 402         (*auth_method)->name = "sam";
 403         return NT_STATUS_OK;
 404 }
 405
 406 NTSTATUS auth_sam_init(void)
 407 {
 408         smb_register_auth(AUTH_INTERFACE_VERSION, "sam", auth_init_sam);
 409         smb_register_auth(AUTH_INTERFACE_VERSION, "sam_ignoredomain", auth_init_sam_ignoredomain);
 410         return NT_STATUS_OK;
 411 }