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                                 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 vaild 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)) {
 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                 if (last_set_time == 0) {
 172                         DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
 173                         return NT_STATUS_PASSWORD_MUST_CHANGE;
 174                 }
 175
 176                 /* check for expired password */
 177                 if (must_change_time < time(NULL) && must_change_time != 0) {
 178                         DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
 179                         DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
 180                         return NT_STATUS_PASSWORD_EXPIRED;
 181                 }
 182         }
 183
 184         /* Test workstation. Workstation list is comma separated. */
 185
 186         workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
 187         if (!workstation_list)
 188                 return NT_STATUS_NO_MEMORY;
 189
 190         if (*workstation_list) {
 191                 BOOL invalid_ws = True;
 192                 fstring tok;
 193                 const char *s = workstation_list;
 194
 195                 const char *machine_name = talloc_asprintf(mem_ctx, "%s$", user_info->wksta_name);
 196                 if (machine_name == NULL)
 197                         return NT_STATUS_NO_MEMORY;
 198
 199
 200                 while (next_token(&s, tok, ",", sizeof(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                 }
 216
 217                 if (invalid_ws)
 218                         return NT_STATUS_INVALID_WORKSTATION;
 219         }
 220
 221         if (acct_ctrl & ACB_DOMTRUST) {
 222                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
 223                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 224         }
 225
 226         if (acct_ctrl & ACB_SVRTRUST) {
 227                 if (!(user_info->logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
 228                         DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
 229                         return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 230                 }
 231         }
 232
 233         if (acct_ctrl & ACB_WSTRUST) {
 234                 if (!(user_info->logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
 235                         DEBUG(2,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
 236                         return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 237                 }
 238         }
 239         return NT_STATUS_OK;
 240 }
 241
 242 /****************************************************************************
 243 check if a username/password is OK assuming the password is a 24 byte
 244 SMB hash supplied in the user_info structure
 245 return an NT_STATUS constant.
 246 ****************************************************************************/
 247
 248 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
 249                                    void *my_private_data,
 250                                    TALLOC_CTX *mem_ctx,
 251                                    const auth_usersupplied_info *user_info,
 252                                    auth_serversupplied_info **server_info)
 253 {
 254         struct samu *sampass=NULL;
 255         BOOL ret;
 256         NTSTATUS nt_status;
 257         NTSTATUS update_login_attempts_status;
 258         DATA_BLOB user_sess_key = data_blob(NULL, 0);
 259         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
 260         BOOL updated_autolock = False, updated_badpw = False;
 261
 262         if (!user_info || !auth_context) {
 263                 return NT_STATUS_UNSUCCESSFUL;
 264         }
 265
 266         /* the returned struct gets kept on the server_info, by means
 267            of a steal further down */
 268
 269         if ( !(sampass = samu_new( mem_ctx )) ) {
 270                 return NT_STATUS_NO_MEMORY;
 271         }
 272
 273         /* get the account information */
 274
 275         become_root();
 276         ret = pdb_getsampwnam(sampass, user_info->internal_username);
 277         unbecome_root();
 278
 279         if (ret == False) {
 280                 DEBUG(3,("check_sam_security: Couldn't find user '%s' in "
 281                          "passdb.\n", user_info->internal_username));
 282                 TALLOC_FREE(sampass);
 283                 return NT_STATUS_NO_SUCH_USER;
 284         }
 285
 286         /* see if autolock flag needs to be updated */
 287         if (pdb_get_acct_ctrl(sampass) & ACB_NORMAL)
 288                 pdb_update_autolock_flag(sampass, &updated_autolock);
 289         /* Quit if the account was locked out. */
 290         if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) {
 291                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", pdb_get_username(sampass)));
 292                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 293         }
 294
 295         nt_status = sam_password_ok(auth_context, mem_ctx, sampass,
 296                                     user_info, &user_sess_key, &lm_sess_key);
 297
 298         /* Notify passdb backend of login success/failure. If not NT_STATUS_OK the backend doesn't like the login */
 299         update_login_attempts_status = pdb_update_login_attempts(sampass, NT_STATUS_IS_OK(nt_status));
 300         if (!NT_STATUS_IS_OK(update_login_attempts_status))
 301                 nt_status = update_login_attempts_status;
 302
 303         if (!NT_STATUS_IS_OK(nt_status)) {
 304                 if (NT_STATUS_EQUAL(nt_status,NT_STATUS_WRONG_PASSWORD) &&
 305                     pdb_get_acct_ctrl(sampass) &ACB_NORMAL) {
 306                         pdb_increment_bad_password_count(sampass);
 307                         updated_badpw = True;
 308                 } else {
 309                         pdb_update_bad_password_count(sampass,
 310                                                       &updated_badpw);
 311                 }
 312                 if (updated_autolock || updated_badpw){
 313                         become_root();
 314                         if(!NT_STATUS_IS_OK(pdb_update_sam_account(sampass)))
 315                                 DEBUG(1, ("Failed to modify entry.\n"));
 316                         unbecome_root();
 317                 }
 318                 data_blob_free(&user_sess_key);
 319                 data_blob_free(&lm_sess_key);
 320                 TALLOC_FREE(sampass);
 321                 return nt_status;
 322         }
 323
 324         if ((pdb_get_acct_ctrl(sampass) & ACB_NORMAL) &&
 325             (pdb_get_bad_password_count(sampass) > 0)){
 326                 pdb_set_bad_password_count(sampass, 0, PDB_CHANGED);
 327                 pdb_set_bad_password_time(sampass, 0, PDB_CHANGED);
 328                 updated_badpw = True;
 329         }
 330
 331         if (updated_autolock || updated_badpw){
 332                 become_root();
 333                 if(!NT_STATUS_IS_OK(pdb_update_sam_account(sampass)))
 334                         DEBUG(1, ("Failed to modify entry.\n"));
 335                 unbecome_root();
 336         }
 337
 338         nt_status = sam_account_ok(mem_ctx, sampass, user_info);
 339
 340         if (!NT_STATUS_IS_OK(nt_status)) {
 341                 TALLOC_FREE(sampass);
 342                 data_blob_free(&user_sess_key);
 343                 data_blob_free(&lm_sess_key);
 344                 return nt_status;
 345         }
 346
 347         become_root();
 348         nt_status = make_server_info_sam(server_info, sampass);
 349         unbecome_root();
 350
 351         if (!NT_STATUS_IS_OK(nt_status)) {
 352                 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
 353                 TALLOC_FREE(sampass);
 354                 data_blob_free(&user_sess_key);
 355                 data_blob_free(&lm_sess_key);
 356                 return nt_status;
 357         }
 358
 359         (*server_info)->user_session_key =
 360                 data_blob_talloc(*server_info, user_sess_key.data,
 361                                  user_sess_key.length);
 362         data_blob_free(&user_sess_key);
 363
 364         (*server_info)->lm_session_key =
 365                 data_blob_talloc(*server_info, lm_sess_key.data,
 366                                  lm_sess_key.length);
 367         data_blob_free(&lm_sess_key);
 368
 369         (*server_info)->was_mapped |= user_info->was_mapped;
 370
 371         return nt_status;
 372 }
 373
 374 /* module initialisation */
 375 static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 376 {
 377         if (!make_auth_methods(auth_context, auth_method)) {
 378                 return NT_STATUS_NO_MEMORY;
 379         }
 380
 381         (*auth_method)->auth = check_sam_security;
 382         (*auth_method)->name = "sam_ignoredomain";
 383         return NT_STATUS_OK;
 384 }
 385
 386
 387 /****************************************************************************
 388 Check SAM security (above) but with a few extra checks.
 389 ****************************************************************************/
 390
 391 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
 392                                          void *my_private_data,
 393                                          TALLOC_CTX *mem_ctx,
 394                                          const auth_usersupplied_info *user_info,
 395                                          auth_serversupplied_info **server_info)
 396 {
 397         BOOL is_local_name, is_my_domain;
 398
 399         if (!user_info || !auth_context) {
 400                 return NT_STATUS_LOGON_FAILURE;
 401         }
 402
 403         is_local_name = is_myname(user_info->domain);
 404         is_my_domain  = strequal(user_info->domain, lp_workgroup());
 405
 406         /* check whether or not we service this domain/workgroup name */
 407
 408         switch ( lp_server_role() ) {
 409                 case ROLE_STANDALONE:
 410                 case ROLE_DOMAIN_MEMBER:
 411                         if ( !is_local_name ) {
 412                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names (%s)\n",
 413                                         user_info->domain, (lp_server_role() == ROLE_DOMAIN_MEMBER
 414                                         ? "ROLE_DOMAIN_MEMBER" : "ROLE_STANDALONE") ));
 415                                 return NT_STATUS_NOT_IMPLEMENTED;
 416                         }
 417                 case ROLE_DOMAIN_PDC:
 418                 case ROLE_DOMAIN_BDC:
 419                         if ( !is_local_name && !is_my_domain ) {
 420                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names or domain name (DC)\n",
 421                                         user_info->domain));
 422                                 return NT_STATUS_NOT_IMPLEMENTED;
 423                         }
 424                 default: /* name is ok */
 425                         break;
 426         }
 427
 428         return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
 429 }
 430
 431 /* module initialisation */
 432 static NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 433 {
 434         if (!make_auth_methods(auth_context, auth_method)) {
 435                 return NT_STATUS_NO_MEMORY;
 436         }
 437
 438         (*auth_method)->auth = check_samstrict_security;
 439         (*auth_method)->name = "sam";
 440         return NT_STATUS_OK;
 441 }
 442
 443 NTSTATUS auth_sam_init(void)
 444 {
 445         smb_register_auth(AUTH_INTERFACE_VERSION, "sam", auth_init_sam);
 446         smb_register_auth(AUTH_INTERFACE_VERSION, "sam_ignoredomain", auth_init_sam_ignoredomain);
 447         return NT_STATUS_OK;
 448 }