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
   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  Core of smb password checking routine.
  31 ****************************************************************************/
  32
  33 static BOOL smb_pwd_check_ntlmv1(const DATA_BLOB *nt_response,
  34                                  const uchar *part_passwd,
  35                                  const DATA_BLOB *sec_blob,
  36                                  DATA_BLOB *user_sess_key)
  37 {
  38         /* Finish the encryption of part_passwd. */
  39         uchar p24[24];
  40
  41         if (part_passwd == NULL) {
  42                 DEBUG(10,("No password set - DISALLOWING access\n"));
  43                 /* No password set - always false ! */
  44                 return False;
  45         }
  46
  47         if (sec_blob->length != 8) {
  48                 DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect challenge size (%lu)\n", (unsigned long)sec_blob->length));
  49                 return False;
  50         }
  51
  52         if (nt_response->length != 24) {
  53                 DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect password length (%lu)\n", (unsigned long)nt_response->length));
  54                 return False;
  55         }
  56
  57         SMBOWFencrypt(part_passwd, sec_blob->data, p24);
  58         if (user_sess_key != NULL) {
  59                 *user_sess_key = data_blob(NULL, 16);
  60                 SMBsesskeygen_ntv1(part_passwd, NULL, user_sess_key->data);
  61         }
  62
  63
  64
  65 #if DEBUG_PASSWORD
  66         DEBUG(100,("Part password (P16) was |\n"));
  67         dump_data(100, part_passwd, 16);
  68         DEBUGADD(100,("Password from client was |\n"));
  69         dump_data(100, nt_response->data, nt_response->length);
  70         DEBUGADD(100,("Given challenge was |\n"));
  71         dump_data(100, sec_blob->data, sec_blob->length);
  72         DEBUGADD(100,("Value from encryption was |\n"));
  73         dump_data(100, p24, 24);
  74 #endif
  75   return (memcmp(p24, nt_response->data, 24) == 0);
  76 }
  77
  78 /****************************************************************************
  79  Core of smb password checking routine. (NTLMv2, LMv2)
  80  Note:  The same code works with both NTLMv2 and LMv2.
  81 ****************************************************************************/
  82
  83 static BOOL smb_pwd_check_ntlmv2(const DATA_BLOB *ntv2_response,
  84                                  const uchar *part_passwd,
  85                                  const DATA_BLOB *sec_blob,
  86                                  const char *user, const char *domain,
  87                                  DATA_BLOB *user_sess_key)
  88 {
  89         /* Finish the encryption of part_passwd. */
  90         uchar kr[16];
  91         uchar value_from_encryption[16];
  92         uchar client_response[16];
  93         DATA_BLOB client_key_data;
  94
  95         if (part_passwd == NULL) {
  96                 DEBUG(10,("No password set - DISALLOWING access\n"));
  97                 /* No password set - always False */
  98                 return False;
  99         }
 100
 101         if (ntv2_response->length < 24) {
 102                 /* We MUST have more than 16 bytes, or the stuff below will go
 103                    crazy.  No known implementation sends less than the 24 bytes
 104                    for LMv2, let alone NTLMv2. */
 105                 DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect password length (%lu)\n",
 106                           (unsigned long)ntv2_response->length));
 107                 return False;
 108         }
 109
 110         client_key_data = data_blob(ntv2_response->data+16, ntv2_response->length-16);
 111         /*
 112            todo:  should we be checking this for anything?  We can't for LMv2,
 113            but for NTLMv2 it is meant to contain the current time etc.
 114         */
 115
 116         memcpy(client_response, ntv2_response->data, sizeof(client_response));
 117
 118         if (!ntv2_owf_gen(part_passwd, user, domain, kr)) {
 119                 return False;
 120         }
 121
 122         SMBOWFencrypt_ntv2(kr, sec_blob, &client_key_data, value_from_encryption);
 123         if (user_sess_key != NULL) {
 124                 *user_sess_key = data_blob(NULL, 16);
 125                 SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key->data);
 126         }
 127
 128 #if DEBUG_PASSWORD
 129         DEBUG(100,("Part password (P16) was |\n"));
 130         dump_data(100, part_passwd, 16);
 131         DEBUGADD(100,("Password from client was |\n"));
 132         dump_data(100, ntv2_response->data, ntv2_response->length);
 133         DEBUGADD(100,("Variable data from client was |\n"));
 134         dump_data(100, client_key_data.data, client_key_data.length);
 135         DEBUGADD(100,("Given challenge was |\n"));
 136         dump_data(100, sec_blob->data, sec_blob->length);
 137         DEBUGADD(100,("Value from encryption was |\n"));
 138         dump_data(100, value_from_encryption, 16);
 139 #endif
 140         data_blob_clear_free(&client_key_data);
 141         return (memcmp(value_from_encryption, client_response, 16) == 0);
 142 }
 143
 144 /****************************************************************************
 145  Do a specific test for an smb password being correct, given a smb_password and
 146  the lanman and NT responses.
 147 ****************************************************************************/
 148
 149 static NTSTATUS sam_password_ok(const struct auth_context *auth_context,
 150                                 TALLOC_CTX *mem_ctx,
 151                                 SAM_ACCOUNT *sampass,
 152                                 const auth_usersupplied_info *user_info,
 153                                 DATA_BLOB *user_sess_key,
 154                                 DATA_BLOB *lm_sess_key)
 155 {
 156         uint16 acct_ctrl;
 157         const uint8 *nt_pw, *lm_pw;
 158         uint32 auth_flags;
 159
 160         acct_ctrl = pdb_get_acct_ctrl(sampass);
 161         if (acct_ctrl & ACB_PWNOTREQ) {
 162                 if (lp_null_passwords()) {
 163                         DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", pdb_get_username(sampass)));
 164                         return(NT_STATUS_OK);
 165                 } else {
 166                         DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", pdb_get_username(sampass)));
 167                         return(NT_STATUS_LOGON_FAILURE);
 168                 }
 169         }
 170
 171         auth_flags = user_info->auth_flags;
 172
 173         if (IS_SAM_DEFAULT(sampass, PDB_NTPASSWD)) {
 174                 DEBUG(3,("sam_password_ok: NO NT password stored for user %s.\n",
 175                          pdb_get_username(sampass)));
 176                 /* No return, we want to check the LM hash below in this case */
 177                 auth_flags &= (~(AUTH_FLAG_NTLMv2_RESP |  AUTH_FLAG_NTLM_RESP));
 178         } else {
 179                 /* Check for cleartext netlogon. Used by Exchange 5.5. */
 180                 unsigned char zeros[8];
 181
 182                 memset(zeros,'\0',sizeof(zeros));
 183                 if (auth_context->challenge.length == sizeof(zeros) &&
 184                                 (memcmp(auth_context->challenge.data, zeros, auth_context->challenge.length) == 0 ) &&
 185                                 user_info->nt_resp.length) {
 186                         if ((nt_pw = pdb_get_nt_passwd(sampass)) != NULL) {
 187                                 unsigned char pwhash[16];
 188                                 mdfour(pwhash, user_info->nt_resp.data, user_info->nt_resp.length);
 189                                 if (memcmp(pwhash, nt_pw, sizeof(pwhash)) == 0) {
 190                                         return NT_STATUS_OK;
 191                                 }
 192                         }
 193                 }
 194         }
 195
 196         if (auth_flags & AUTH_FLAG_NTLMv2_RESP) {
 197                 nt_pw = pdb_get_nt_passwd(sampass);
 198                 /* We have the NT MD4 hash challenge available - see if we can
 199                    use it (ie. does it exist in the smbpasswd file).
 200                 */
 201                 DEBUG(4,("sam_password_ok: Checking NTLMv2 password with domain [%s]\n", user_info->client_domain.str));
 202                 if (smb_pwd_check_ntlmv2( &user_info->nt_resp,
 203                                           nt_pw, &auth_context->challenge,
 204                                           user_info->smb_name.str,
 205                                           user_info->client_domain.str,
 206                                           user_sess_key)) {
 207                         return NT_STATUS_OK;
 208                 }
 209
 210                 DEBUG(4,("sam_password_ok: Checking NTLMv2 password without a domain\n"));
 211                 if (smb_pwd_check_ntlmv2( &user_info->nt_resp,
 212                                           nt_pw, &auth_context->challenge,
 213                                           user_info->smb_name.str,
 214                                           "",
 215                                           user_sess_key)) {
 216                         return NT_STATUS_OK;
 217                 } else {
 218                         DEBUG(3,("sam_password_ok: NTLMv2 password check failed\n"));
 219                         return NT_STATUS_WRONG_PASSWORD;
 220                 }
 221         } else if (auth_flags & AUTH_FLAG_NTLM_RESP) {
 222                 if (lp_ntlm_auth()) {
 223                         nt_pw = pdb_get_nt_passwd(sampass);
 224                         /* We have the NT MD4 hash challenge available - see if we can
 225                            use it (ie. does it exist in the smbpasswd file).
 226                         */
 227                         DEBUG(4,("sam_password_ok: Checking NT MD4 password\n"));
 228                         if (smb_pwd_check_ntlmv1(&user_info->nt_resp,
 229                                                  nt_pw, &auth_context->challenge,
 230                                                  user_sess_key)) {
 231                                 /* The LM session key for this response is not very secure,
 232                                    so use it only if we otherwise allow LM authentication */
 233                                 lm_pw = pdb_get_lanman_passwd(sampass);
 234
 235                                 if (lp_lanman_auth() && lm_pw) {
 236                                         uint8 first_8_lm_hash[16];
 237                                         memcpy(first_8_lm_hash, lm_pw, 8);
 238                                         memset(first_8_lm_hash + 8, '\0', 8);
 239                                         *lm_sess_key = data_blob(first_8_lm_hash, 16);
 240                                 }
 241                                 return NT_STATUS_OK;
 242                         } else {
 243                                 DEBUG(3,("sam_password_ok: NT MD4 password check failed for user %s\n",pdb_get_username(sampass)));
 244                                 return NT_STATUS_WRONG_PASSWORD;
 245                         }
 246                 } else {
 247                         DEBUG(2,("sam_password_ok: NTLMv1 passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));
 248                         /* no return, becouse we might pick up LMv2 in the LM field */
 249                 }
 250         }
 251
 252         if (auth_flags & AUTH_FLAG_LM_RESP) {
 253                 if (user_info->lm_resp.length != 24) {
 254                         DEBUG(2,("sam_password_ok: invalid LanMan password length (%lu) for user %s\n",
 255                                  (unsigned long)user_info->nt_resp.length, pdb_get_username(sampass)));
 256                 }
 257
 258                 if (!lp_lanman_auth()) {
 259                         DEBUG(3,("sam_password_ok: Lanman passwords NOT PERMITTED for user %s\n",pdb_get_username(sampass)));
 260                 } else if (IS_SAM_DEFAULT(sampass, PDB_LMPASSWD)) {
 261                         DEBUG(3,("sam_password_ok: NO LanMan password set for user %s (and no NT password supplied)\n",pdb_get_username(sampass)));
 262                 } else {
 263                         lm_pw = pdb_get_lanman_passwd(sampass);
 264
 265                         DEBUG(4,("sam_password_ok: Checking LM password\n"));
 266                         if (smb_pwd_check_ntlmv1(&user_info->lm_resp,
 267                                                  lm_pw, &auth_context->challenge,
 268                                                  NULL)) {
 269                                 uint8 first_8_lm_hash[16];
 270                                 memcpy(first_8_lm_hash, lm_pw, 8);
 271                                 memset(first_8_lm_hash + 8, '\0', 8);
 272                                 *user_sess_key = data_blob(first_8_lm_hash, 16);
 273                                 *lm_sess_key = data_blob(first_8_lm_hash, 16);
 274                                 return NT_STATUS_OK;
 275                         }
 276                 }
 277
 278                 if (IS_SAM_DEFAULT(sampass, PDB_NTPASSWD)) {
 279                         DEBUG(4,("sam_password_ok: LM password check failed for user, no NT password %s\n",pdb_get_username(sampass)));
 280                         return NT_STATUS_WRONG_PASSWORD;
 281                 }
 282
 283                 nt_pw = pdb_get_nt_passwd(sampass);
 284
 285                 /* This is for 'LMv2' authentication.  almost NTLMv2 but limited to 24 bytes.
 286                    - related to Win9X, legacy NAS pass-though authentication
 287                 */
 288                 DEBUG(4,("sam_password_ok: Checking LMv2 password with domain %s\n", user_info->client_domain.str));
 289                 if (smb_pwd_check_ntlmv2( &user_info->lm_resp,
 290                                           nt_pw, &auth_context->challenge,
 291                                           user_info->smb_name.str,
 292                                           user_info->client_domain.str,
 293                                           NULL)) {
 294                         return NT_STATUS_OK;
 295                 }
 296
 297                 DEBUG(4,("sam_password_ok: Checking LMv2 password without a domain\n"));
 298                 if (smb_pwd_check_ntlmv2( &user_info->lm_resp,
 299                                           nt_pw, &auth_context->challenge,
 300                                           user_info->smb_name.str,
 301                                           "",
 302                                           NULL)) {
 303                         return NT_STATUS_OK;
 304                 }
 305
 306                 /* Apparently NT accepts NT responses in the LM field
 307                    - I think this is related to Win9X pass-though authentication
 308                 */
 309                 DEBUG(4,("sam_password_ok: Checking NT MD4 password in LM field\n"));
 310                 if (lp_ntlm_auth()) {
 311                         if (smb_pwd_check_ntlmv1(&user_info->lm_resp,
 312                                                  nt_pw, &auth_context->challenge,
 313                                                  NULL)) {
 314                                 /* The session key for this response is still very odd.
 315                                    It not very secure, so use it only if we otherwise
 316                                    allow LM authentication */
 317                                 lm_pw = pdb_get_lanman_passwd(sampass);
 318
 319                                 if (lp_lanman_auth() && lm_pw) {
 320                                         uint8 first_8_lm_hash[16];
 321                                         memcpy(first_8_lm_hash, lm_pw, 8);
 322                                         memset(first_8_lm_hash + 8, '\0', 8);
 323                                         *user_sess_key = data_blob(first_8_lm_hash, 16);
 324                                         *lm_sess_key = data_blob(first_8_lm_hash, 16);
 325                                 }
 326                                 return NT_STATUS_OK;
 327                         }
 328                         DEBUG(3,("sam_password_ok: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",pdb_get_username(sampass)));
 329                         return NT_STATUS_WRONG_PASSWORD;
 330                 } else {
 331                         DEBUG(3,("sam_password_ok: LM password and LMv2 failed for user %s, and NT MD4 password in LM field not permitted\n",pdb_get_username(sampass)));
 332                         return NT_STATUS_WRONG_PASSWORD;
 333                 }
 334         }
 335
 336         /* Should not be reached, but if they send nothing... */
 337         DEBUG(3,("sam_password_ok: NEITHER LanMan nor NT password supplied for user %s\n",pdb_get_username(sampass)));
 338         return NT_STATUS_WRONG_PASSWORD;
 339 }
 340
 341 /****************************************************************************
 342  Do a specific test for a SAM_ACCOUNT being vaild for this connection
 343  (ie not disabled, expired and the like).
 344 ****************************************************************************/
 345
 346 static NTSTATUS sam_account_ok(TALLOC_CTX *mem_ctx,
 347                                SAM_ACCOUNT *sampass,
 348                                const auth_usersupplied_info *user_info)
 349 {
 350         uint16  acct_ctrl = pdb_get_acct_ctrl(sampass);
 351         char *workstation_list;
 352         time_t kickoff_time;
 353
 354         DEBUG(4,("sam_account_ok: Checking SMB password for user %s\n",pdb_get_username(sampass)));
 355
 356         /* Quit if the account was disabled. */
 357         if (acct_ctrl & ACB_DISABLED) {
 358                 DEBUG(1,("sam_account_ok: Account for user '%s' was disabled.\n", pdb_get_username(sampass)));
 359                 return NT_STATUS_ACCOUNT_DISABLED;
 360         }
 361
 362         /* Quit if the account was locked out. */
 363         if (acct_ctrl & ACB_AUTOLOCK) {
 364                 DEBUG(1,("sam_account_ok: Account for user %s was locked out.\n", pdb_get_username(sampass)));
 365                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 366         }
 367
 368         /* Test account expire time */
 369
 370         kickoff_time = pdb_get_kickoff_time(sampass);
 371         if (kickoff_time != 0 && time(NULL) > kickoff_time) {
 372                 DEBUG(1,("sam_account_ok: Account for user '%s' has expired.\n", pdb_get_username(sampass)));
 373                 DEBUG(3,("sam_account_ok: Account expired at '%ld' unix time.\n", (long)kickoff_time));
 374                 return NT_STATUS_ACCOUNT_EXPIRED;
 375         }
 376
 377         if (!(pdb_get_acct_ctrl(sampass) & ACB_PWNOEXP)) {
 378                 time_t must_change_time = pdb_get_pass_must_change_time(sampass);
 379                 time_t last_set_time = pdb_get_pass_last_set_time(sampass);
 380
 381                 /* check for immediate expiry "must change at next logon" */
 382                 if (must_change_time == 0 && last_set_time != 0) {
 383                         DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n", pdb_get_username(sampass)));
 384                         return NT_STATUS_PASSWORD_MUST_CHANGE;
 385                 }
 386
 387                 /* check for expired password */
 388                 if (must_change_time < time(NULL) && must_change_time != 0) {
 389                         DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n", pdb_get_username(sampass)));
 390                         DEBUG(1,("sam_account_ok: Password expired at '%s' (%ld) unix time.\n", http_timestring(must_change_time), (long)must_change_time));
 391                         return NT_STATUS_PASSWORD_EXPIRED;
 392                 }
 393         }
 394
 395         /* Test workstation. Workstation list is comma separated. */
 396
 397         workstation_list = talloc_strdup(mem_ctx, pdb_get_workstations(sampass));
 398         if (!workstation_list)
 399                 return NT_STATUS_NO_MEMORY;
 400
 401         if (*workstation_list) {
 402                 BOOL invalid_ws = True;
 403                 const char *s = workstation_list;
 404
 405                 fstring tok;
 406
 407                 while (next_token(&s, tok, ",", sizeof(tok))) {
 408                         DEBUG(10,("sam_account_ok: checking for workstation match %s and %s (len=%d)\n",
 409                                   tok, user_info->wksta_name.str, user_info->wksta_name.len));
 410                         if(strequal(tok, user_info->wksta_name.str)) {
 411                                 invalid_ws = False;
 412                                 break;
 413                         }
 414                 }
 415
 416                 if (invalid_ws)
 417                         return NT_STATUS_INVALID_WORKSTATION;
 418         }
 419
 420         if (acct_ctrl & ACB_DOMTRUST) {
 421                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", pdb_get_username(sampass)));
 422                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 423         }
 424
 425         if (acct_ctrl & ACB_SVRTRUST) {
 426                 DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", pdb_get_username(sampass)));
 427                 return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 428         }
 429
 430         if (acct_ctrl & ACB_WSTRUST) {
 431                 DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", pdb_get_username(sampass)));
 432                 return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 433         }
 434
 435         return NT_STATUS_OK;
 436 }
 437
 438 /****************************************************************************
 439 check if a username/password is OK assuming the password is a 24 byte
 440 SMB hash supplied in the user_info structure
 441 return an NT_STATUS constant.
 442 ****************************************************************************/
 443
 444 static NTSTATUS check_sam_security(const struct auth_context *auth_context,
 445                                    void *my_private_data,
 446                                    TALLOC_CTX *mem_ctx,
 447                                    const auth_usersupplied_info *user_info,
 448                                    auth_serversupplied_info **server_info)
 449 {
 450         SAM_ACCOUNT *sampass=NULL;
 451         BOOL ret;
 452         NTSTATUS nt_status;
 453         DATA_BLOB user_sess_key = data_blob(NULL, 0);
 454         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
 455
 456         if (!user_info || !auth_context) {
 457                 return NT_STATUS_UNSUCCESSFUL;
 458         }
 459
 460         /* Can't use the talloc version here, because the returned struct gets
 461            kept on the server_info */
 462         if (!NT_STATUS_IS_OK(nt_status = pdb_init_sam(&sampass))) {
 463                 return nt_status;
 464         }
 465
 466         /* get the account information */
 467
 468         become_root();
 469         ret = pdb_getsampwnam(sampass, user_info->internal_username.str);
 470         unbecome_root();
 471
 472         if (ret == False) {
 473                 DEBUG(3,("check_sam_security: Couldn't find user '%s' in passdb file.\n", user_info->internal_username.str));
 474                 pdb_free_sam(&sampass);
 475                 return NT_STATUS_NO_SUCH_USER;
 476         }
 477
 478         nt_status = sam_password_ok(auth_context, mem_ctx, sampass,
 479                                     user_info, &user_sess_key, &lm_sess_key);
 480
 481         if (!NT_STATUS_IS_OK(nt_status)) {
 482                 pdb_free_sam(&sampass);
 483                 return nt_status;
 484         }
 485
 486         nt_status = sam_account_ok(mem_ctx, sampass, user_info);
 487
 488         if (!NT_STATUS_IS_OK(nt_status)) {
 489                 pdb_free_sam(&sampass);
 490                 return nt_status;
 491         }
 492
 493         if (!NT_STATUS_IS_OK(nt_status = make_server_info_sam(server_info, sampass))) {
 494                 DEBUG(0,("check_sam_security: make_server_info_sam() failed with '%s'\n", nt_errstr(nt_status)));
 495                 return nt_status;
 496         }
 497
 498         (*server_info)->nt_session_key = user_sess_key;
 499         (*server_info)->lm_session_key = lm_sess_key;
 500
 501         return nt_status;
 502 }
 503
 504 /* module initialisation */
 505 static NTSTATUS auth_init_sam_ignoredomain(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 506 {
 507         if (!make_auth_methods(auth_context, auth_method)) {
 508                 return NT_STATUS_NO_MEMORY;
 509         }
 510
 511         (*auth_method)->auth = check_sam_security;
 512         (*auth_method)->name = "sam_ignoredomain";
 513         return NT_STATUS_OK;
 514 }
 515
 516
 517 /****************************************************************************
 518 Check SAM security (above) but with a few extra checks.
 519 ****************************************************************************/
 520
 521 static NTSTATUS check_samstrict_security(const struct auth_context *auth_context,
 522                                          void *my_private_data,
 523                                          TALLOC_CTX *mem_ctx,
 524                                          const auth_usersupplied_info *user_info,
 525                                          auth_serversupplied_info **server_info)
 526 {
 527         BOOL is_local_name, is_my_domain;
 528
 529         if (!user_info || !auth_context) {
 530                 return NT_STATUS_LOGON_FAILURE;
 531         }
 532
 533         is_local_name = is_myname(user_info->domain.str);
 534         is_my_domain  = strequal(user_info->domain.str, lp_workgroup());
 535
 536         /* check whether or not we service this domain/workgroup name */
 537
 538         switch ( lp_server_role() ) {
 539                 case ROLE_STANDALONE:
 540                 case ROLE_DOMAIN_MEMBER:
 541                         if ( !is_local_name ) {
 542                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names (%s)\n",
 543                                         user_info->domain.str, (lp_server_role() == ROLE_DOMAIN_MEMBER
 544                                         ? "ROLE_DOMAIN_MEMBER" : "ROLE_STANDALONE") ));
 545                                 return NT_STATUS_NOT_IMPLEMENTED;
 546                         }
 547                 case ROLE_DOMAIN_PDC:
 548                 case ROLE_DOMAIN_BDC:
 549                         if ( !is_local_name && !is_my_domain ) {
 550                                 DEBUG(6,("check_samstrict_security: %s is not one of my local names or domain name (DC)\n",
 551                                         user_info->domain.str));
 552                                 return NT_STATUS_NOT_IMPLEMENTED;
 553                         }
 554                 default: /* name is ok */
 555                         break;
 556         }
 557
 558         return check_sam_security(auth_context, my_private_data, mem_ctx, user_info, server_info);
 559 }
 560
 561 /* module initialisation */
 562 static NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 563 {
 564         if (!make_auth_methods(auth_context, auth_method)) {
 565                 return NT_STATUS_NO_MEMORY;
 566         }
 567
 568         (*auth_method)->auth = check_samstrict_security;
 569         (*auth_method)->name = "sam";
 570         return NT_STATUS_OK;
 571 }
 572
 573 NTSTATUS auth_sam_init(void)
 574 {
 575         smb_register_auth(AUTH_INTERFACE_VERSION, "sam", auth_init_sam);
 576         smb_register_auth(AUTH_INTERFACE_VERSION, "sam_ignoredomain", auth_init_sam_ignoredomain);
 577         return NT_STATUS_OK;
 578 }