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 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,
  66                                    user_info->client_domain,
  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         time_t lasttime;
  82         uint8 bitmask, bitpos;
  83
  84         hours = pdb_get_hours(sampass);
  85         if (!hours) {
  86                 DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n",pdb_get_username(sampass)));
  87                 return True;
  88         }
  89
  90         lasttime = (time_t)smb_last_time.tv_sec;
  91         utctime = gmtime(&lasttime);
  92
  93         /* find the corresponding byte and bit */
  94         bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
  95         bitmask = 1 << (bitpos % 8);
  96
  97         if (! (hours[bitpos/8] & bitmask)) {
  98                 DEBUG(1,("logon_hours_ok: Account for user %s not allowed to logon at this time (%s).\n",
  99                         pdb_get_username(sampass),
 100                         asctime(localtime(&lasttime)) ));
 101                 return False;
 102         }
 103
 104         DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
 105                 pdb_get_username(sampass), asctime(utctime) ));
 106
 107         return True;
 108 }
 109
 110 /****************************************************************************
 111  Do a specific test for a SAM_ACCOUNT being vaild for this connection
 112  (ie not disabled, expired and the like).
 113 ****************************************************************************/
 114
 115 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
 116                                SAM_ACCOUNT *sampass,
 117                                const auth_usersupplied_info *user_info)
 118 {
 119         uint16  acct_ctrl = pdb_get_acct_ctrl(sampass);
 120         char *workstation_list;
 121         time_t kickoff_time;
 122
 123         DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
 124
 125         /* Quit if the account was disabled. */
 126         if (acct_ctrl & ACB_DISABLED) {
 127                 DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
 128                 return NT_STATUS_ACCOUNT_DISABLED;
 129         }
 130
 131         /* Quit if the account was locked out. */
 132         if (acct_ctrl & ACB_AUTOLOCK) {
 133                 DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", pdb_get_username(sampass)));
 134                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 135         }
 136
 137         /* Quit if the account is not allowed to logon at this time. */
 138         if (! logon_hours_ok(sampass)) {
 139                 return NT_STATUS_INVALID_LOGON_HOURS;
 140         }
 141
 142         /* Test account expire time */
 143
 144         kickoff_time = pdb_get_kickoff_time(sampass);
 145         if (kickoff_time != 0 && time(NULL) > kickoff_time) {
 146                 DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", pdb_get_username(sampass)));
 147                 DEBUG(3,("sam_account_ok: Account expired at '%ld' unix time.\n", (long)kickoff_time));
 148                 return NT_STATUS_ACCOUNT_EXPIRED;
 149         }
 150
 151         if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
 152                 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
 153                 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
 154
 155                 /* check for immediate expiry "must change at next logon" */
 156                 if (must_change_time == 0 && last_set_time != 0) {
 157                         DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
 158                         return NT_STATUS_PASSWORD_MUST_CHANGE;
 159                 }
 160
 161                 /* check for expired password */
 162                 if (must_change_time < time(NULL) && must_change_time != 0) {
 163                         DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
 164                         DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
 165                         return NT_STATUS_PASSWORD_EXPIRED;
 166                 }
 167         }
 168
 169         /* Test workstation. Workstation list is comma separated. */
 170
 171         workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
 172         if (!workstation_list)
 173                 return NT_STATUS_NO_MEMORY;
 174
 175         if (*workstation_list) {
 176                 BOOL invalid_ws = True;
 177                 fstring tok;
 178                 const char *s = workstation_list;
 179
 180                 const char *machine_name = talloc_asprintf(mem_ctx, "%s$", user_info->wksta_name);
 181                 if (machine_name == NULL)
 182                         return NT_STATUS_NO_MEMORY;
 183
 184
 185                 while (next_token(&s, tok, ",", sizeof(tok))) {
 186                         DEBUG(10,("sam_account_ok: checking for workstation match %s and %s\n",
 187                                   tok, user_info->wksta_name));
 188                         if(strequal(tok, user_info->wksta_name)) {
 189                                 invalid_ws = False;
 190                                 break;
 191                         }
 192                         if (tok[0] == '+') {
 193                                 DEBUG(10,("sam_account_ok: checking for workstation %s in group: %s\n",
 194                                         machine_name, tok + 1));
 195                                 if (user_in_group(machine_name, tok + 1)) {
 196                                         invalid_ws = False;
 197                                         break;
 198                                 }
 199                         }
 200                 }
 201
 202                 if (invalid_ws)
 203                         return NT_STATUS_INVALID_WORKSTATION;
 204         }
 205
 206         if (acct_ctrl & ACB_DOMTRUST) {
 207                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
 208                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 209         }
 210
 211         if (acct_ctrl & ACB_SVRTRUST) {
 212                 if (!(user_info->logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
 213                         DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
 214                         return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 215                 }
 216         }
 217
 218         if (acct_ctrl & ACB_WSTRUST) {
 219                 if (!(user_info->logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
 220                         DEBUG(2,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
 221                         return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 222                 }
 223         }
 224         return NT_STATUS_OK;
 225 }
 226
 227 /****************************************************************************
 228 check if a username/password is OK assuming the password is a 24 byte
 229 SMB hash supplied in the user_info structure
 230 return an NT_STATUS constant.
 231 ****************************************************************************/
 232
 233 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
 234                                    void *my_private_data,
 235                                    TALLOC_CTX *mem_ctx,
 236                                    const auth_usersupplied_info *user_info,
 237                                    auth_serversupplied_info **server_info)
 238 {
 239         SAM_ACCOUNT *sampass=NULL;
 240         BOOL ret;
 241         NTSTATUS nt_status;
 242         NTSTATUS update_login_attempts_status;
 243         DATA_BLOB user_sess_key = data_blob(NULL, 0);
 244         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
 245         BOOL updated_autolock = False, updated_badpw = False;
 246
 247         if (!user_info || !auth_context) {
 248                 return NT_STATUS_UNSUCCESSFUL;
 249         }
 250
 251         /* Can't use the talloc version here, because the returned struct gets
 252            kept on the server_info */
 253         if (!NT_STATUS_IS_OK(nt_status = pdb_init_sam(&sampass))) {
 254                 return nt_status;
 255         }
 256
 257         /* get the account information */
 258
 259         become_root();
 260         ret = pdb_getsampwnam(sampass, user_info->internal_username);
 261         unbecome_root();
 262
 263         if (ret == False) {
 264                 DEBUG(3,("check_sam_security: Couldn't find user '%s' in "
 265                          "passdb.\n", user_info->internal_username));
 266                 pdb_free_sam(&sampass);
 267                 return NT_STATUS_NO_SUCH_USER;
 268         }
 269
 270         /* see if autolock flag needs to be updated */
 271         if (pdb_get_acct_ctrl(sampass) & ACB_NORMAL)
 272                 pdb_update_autolock_flag(sampass, &updated_autolock);
 273         /* Quit if the account was locked out. */
 274         if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) {
 275                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", pdb_get_username(sampass)));
 276                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 277         }
 278
 279         nt_status = sam_password_ok(auth_context, mem_ctx, sampass,
 280                                     user_info, &user_sess_key, &lm_sess_key);
 281
 282         /* Notify passdb backend of login success/failure. If not NT_STATUS_OK the backend doesn't like the login */
 283         update_login_attempts_status = pdb_update_login_attempts(sampass, NT_STATUS_IS_OK(nt_status));
 284         if (!NT_STATUS_IS_OK(update_login_attempts_status))
 285                 nt_status = update_login_attempts_status;
 286
 287         if (!NT_STATUS_IS_OK(nt_status)) {
 288                 if (NT_STATUS_EQUAL(nt_status,NT_STATUS_WRONG_PASSWORD) &&
 289                     pdb_get_acct_ctrl(sampass) &ACB_NORMAL) {
 290                         pdb_increment_bad_password_count(sampass);
 291                         updated_badpw = True;
 292                 } else {
 293                         pdb_update_bad_password_count(sampass,
 294                                                       &updated_badpw);
 295                 }
 296                 if (updated_autolock || updated_badpw){
 297                         become_root();
 298                         if(!NT_STATUS_IS_OK(pdb_update_sam_account(sampass)))
 299                                 DEBUG(1, ("Failed to modify entry.\n"));
 300                         unbecome_root();
 301                 }
 302                 data_blob_free(&user_sess_key);
 303                 data_blob_free(&lm_sess_key);
 304                 pdb_free_sam(&sampass);
 305                 return nt_status;
 306         }
 307
 308         if ((pdb_get_acct_ctrl(sampass) & ACB_NORMAL) &&
 309             (pdb_get_bad_password_count(sampass) > 0)){
 310                 pdb_set_bad_password_count(sampass, 0, PDB_CHANGED);
 311                 pdb_set_bad_password_time(sampass, 0, PDB_CHANGED);
 312                 updated_badpw = True;
 313         }
 314
 315         if (updated_autolock || updated_badpw){
 316                 become_root();
 317                 if(!NT_STATUS_IS_OK(pdb_update_sam_account(sampass)))
 318                         DEBUG(1, ("Failed to modify entry.\n"));
 319                 unbecome_root();
 320         }
 321
 322         nt_status = sam_account_ok(mem_ctx, sampass, user_info);
 323
 324         if (!NT_STATUS_IS_OK(nt_status)) {
 325                 pdb_free_sam(&sampass);
 326                 data_blob_free(&user_sess_key);
 327                 data_blob_free(&lm_sess_key);
 328                 return nt_status;
 329         }
 330
 331         become_root();
 332         nt_status = make_server_info_sam(server_info, sampass);
 333         unbecome_root();
 334
 335         if (!NT_STATUS_IS_OK(nt_status)) {
 336                 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
 337                 pdb_free_sam(&sampass);
 338                 data_blob_free(&user_sess_key);
 339                 data_blob_free(&lm_sess_key);
 340                 return nt_status;
 341         }
 342
 343         (*server_info)->user_session_key =
 344                 data_blob_talloc(*server_info, user_sess_key.data,
 345                                  user_sess_key.length);
 346         data_blob_free(&user_sess_key);
 347
 348         (*server_info)->lm_session_key =
 349                 data_blob_talloc(*server_info, lm_sess_key.data,
 350                                  lm_sess_key.length);
 351         data_blob_free(&lm_sess_key);
 352
 353         return nt_status;
 354 }
 355
 356 /* module initialisation */
 357 static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 358 {
 359         if (!make_auth_methods(auth_context, auth_method)) {
 360                 return NT_STATUS_NO_MEMORY;
 361         }
 362
 363         (*auth_method)->auth = check_sam_security;
 364         (*auth_method)->name = "sam_ignoredomain";
 365         return NT_STATUS_OK;
 366 }
 367
 368
 369 /****************************************************************************
 370 Check SAM security (above) but with a few extra checks.
 371 ****************************************************************************/
 372
 373 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
 374                                          void *my_private_data,
 375                                          TALLOC_CTX *mem_ctx,
 376                                          const auth_usersupplied_info *user_info,
 377                                          auth_serversupplied_info **server_info)
 378 {
 379         BOOL is_local_name, is_my_domain;
 380
 381         if (!user_info || !auth_context) {
 382                 return NT_STATUS_LOGON_FAILURE;
 383         }
 384
 385         is_local_name = is_myname(user_info->domain);
 386         is_my_domain  = strequal(user_info->domain, lp_workgroup());
 387
 388         /* check whether or not we service this domain/workgroup name */
 389
 390         switch ( lp_server_role() ) {
 391                 case ROLE_STANDALONE:
 392                 case ROLE_DOMAIN_MEMBER:
 393                         if ( !is_local_name ) {
 394                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names (%s)\n",
 395                                         user_info->domain, (lp_server_role() == ROLE_DOMAIN_MEMBER
 396                                         ? "ROLE_DOMAIN_MEMBER" : "ROLE_STANDALONE") ));
 397                                 return NT_STATUS_NOT_IMPLEMENTED;
 398                         }
 399                 case ROLE_DOMAIN_PDC:
 400                 case ROLE_DOMAIN_BDC:
 401                         if ( !is_local_name && !is_my_domain ) {
 402                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names or domain name (DC)\n",
 403                                         user_info->domain));
 404                                 return NT_STATUS_NOT_IMPLEMENTED;
 405                         }
 406                 default: /* name is ok */
 407                         break;
 408         }
 409
 410         return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
 411 }
 412
 413 /* module initialisation */
 414 static NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 415 {
 416         if (!make_auth_methods(auth_context, auth_method)) {
 417                 return NT_STATUS_NO_MEMORY;
 418         }
 419
 420         (*auth_method)->auth = check_samstrict_security;
 421         (*auth_method)->name = "sam";
 422         return NT_STATUS_OK;
 423 }
 424
 425 NTSTATUS auth_sam_init(void)
 426 {
 427         smb_register_auth(AUTH_INTERFACE_VERSION, "sam", auth_init_sam);
 428         smb_register_auth(AUTH_INTERFACE_VERSION, "sam_ignoredomain", auth_init_sam_ignoredomain);
 429         return NT_STATUS_OK;
 430 }