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