source/auth/auth_sam.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   4    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2004
   5    Copyright (C) Gerald Carter                             2003
   6    Copyright (C) Stefan Metzmacher                         2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24 #include "librpc/gen_ndr/ndr_netlogon.h"
  25 #include "system/time.h"
  26 #include "db_wrap.h"
  27 #include "lib/ldb/include/ldb.h"
  28 #include "auth/auth.h"
  29 #include "auth/auth_sam.h"
  30 #include "dsdb/samdb/samdb.h"
  31 #include "libcli/security/security.h"
  32 #include "libcli/ldap/ldap.h"
  33
  34 extern const char *user_attrs[];
  35 extern const char *domain_ref_attrs[];
  36
  37 /****************************************************************************
  38  Look for the specified user in the sam, return ldb result structures
  39 ****************************************************************************/
  40
  41 static NTSTATUS authsam_search_account(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
  42                                        const char *account_name,
  43                                        const char *domain_name,
  44                                        struct ldb_message ***ret_msgs,
  45                                        struct ldb_message ***ret_msgs_domain_ref)
  46 {
  47         struct ldb_message **msgs_tmp;
  48         struct ldb_message **msgs;
  49         struct ldb_message **msgs_domain_ref;
  50         struct ldb_dn *partitions_basedn = samdb_partitions_dn(sam_ctx, mem_ctx);
  51
  52         int ret;
  53         int ret_domain;
  54
  55         struct ldb_dn *domain_dn = NULL;
  56
  57         if (domain_name) {
  58                 domain_dn = samdb_domain_to_dn(sam_ctx, mem_ctx, domain_name);
  59                 if (!domain_dn) {
  60                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
  61                 }
  62         }
  63
  64         /* pull the user attributes */
  65         ret = gendb_search(sam_ctx, mem_ctx, domain_dn, &msgs, user_attrs,
  66                            "(&(sAMAccountName=%s)(objectclass=user))",
  67                            ldb_binary_encode_string(mem_ctx, account_name));
  68         if (ret == -1) {
  69                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  70         }
  71
  72         if (ret == 0) {
  73                 DEBUG(3,("sam_search_user: Couldn't find user [%s\\%s] in samdb, under %s\n",
  74                          domain_name, account_name, ldb_dn_get_linearized(domain_dn)));
  75                 return NT_STATUS_NO_SUCH_USER;
  76         }
  77
  78         if (ret > 1) {
  79                 DEBUG(0,("Found %d records matching user [%s]\n", ret, account_name));
  80                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  81         }
  82
  83         if (!domain_dn) {
  84                 struct dom_sid *domain_sid;
  85
  86                 domain_sid = samdb_result_sid_prefix(mem_ctx, msgs[0], "objectSid");
  87                 if (!domain_sid) {
  88                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
  89                 }
  90
  91                 /* find the domain's DN */
  92                 ret = gendb_search(sam_ctx, mem_ctx, NULL, &msgs_tmp, NULL,
  93                                    "(&(objectSid=%s)(objectClass=domain))",
  94                                    ldap_encode_ndr_dom_sid(mem_ctx, domain_sid));
  95                 if (ret == -1) {
  96                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
  97                 }
  98
  99                 if (ret == 0) {
 100                         DEBUG(3,("check_sam_security: Couldn't find domain_sid [%s] in passdb file.\n",
 101                                  dom_sid_string(mem_ctx, domain_sid)));
 102                         return NT_STATUS_NO_SUCH_USER;
 103                 }
 104
 105                 if (ret > 1) {
 106                         DEBUG(0,("Found %d records matching domain_sid [%s]\n",
 107                                  ret, dom_sid_string(mem_ctx, domain_sid)));
 108                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 109                 }
 110
 111                 domain_dn = msgs_tmp[0]->dn;
 112         }
 113
 114         ret_domain = gendb_search(sam_ctx, mem_ctx, partitions_basedn, &msgs_domain_ref, domain_ref_attrs,
 115                                   "(nCName=%s)", ldb_dn_get_linearized(domain_dn));
 116         if (ret_domain == -1) {
 117                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 118         }
 119
 120         if (ret_domain == 0) {
 121                 DEBUG(3,("check_sam_security: Couldn't find domain [%s] in passdb file.\n",
 122                          ldb_dn_get_linearized(msgs_tmp[0]->dn)));
 123                 return NT_STATUS_NO_SUCH_USER;
 124         }
 125
 126         if (ret_domain > 1) {
 127                 DEBUG(0,("Found %d records matching domain [%s]\n",
 128                          ret_domain, ldb_dn_get_linearized(msgs_tmp[0]->dn)));
 129                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 130         }
 131
 132         *ret_msgs = msgs;
 133         *ret_msgs_domain_ref = msgs_domain_ref;
 134
 135         return NT_STATUS_OK;
 136 }
 137
 138 /****************************************************************************
 139  Do a specific test for an smb password being correct, given a smb_password and
 140  the lanman and NT responses.
 141 ****************************************************************************/
 142 static NTSTATUS authsam_password_ok(struct auth_context *auth_context,
 143                                     TALLOC_CTX *mem_ctx,
 144                                     uint16_t acct_flags,
 145                                     const struct samr_Password *lm_pwd,
 146                                     const struct samr_Password *nt_pwd,
 147                                     const struct auth_usersupplied_info *user_info,
 148                                     DATA_BLOB *user_sess_key,
 149                                     DATA_BLOB *lm_sess_key)
 150 {
 151         NTSTATUS status;
 152
 153         if (acct_flags & ACB_PWNOTREQ) {
 154                 if (lp_null_passwords()) {
 155                         DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n",
 156                                  user_info->mapped.account_name));
 157                         return NT_STATUS_OK;
 158                 } else {
 159                         DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n",
 160                                  user_info->mapped.account_name));
 161                         return NT_STATUS_LOGON_FAILURE;
 162                 }
 163         }
 164
 165         switch (user_info->password_state) {
 166         case AUTH_PASSWORD_PLAIN:
 167         {
 168                 const struct auth_usersupplied_info *user_info_temp;
 169                 status = encrypt_user_info(mem_ctx, auth_context,
 170                                            AUTH_PASSWORD_HASH,
 171                                            user_info, &user_info_temp);
 172                 if (!NT_STATUS_IS_OK(status)) {
 173                         DEBUG(1, ("Failed to convert plaintext password to password HASH: %s\n", nt_errstr(status)));
 174                         return status;
 175                 }
 176                 user_info = user_info_temp;
 177
 178                 /*fall through*/
 179         }
 180         case AUTH_PASSWORD_HASH:
 181                 *lm_sess_key = data_blob(NULL, 0);
 182                 *user_sess_key = data_blob(NULL, 0);
 183                 status = hash_password_check(mem_ctx,
 184                                              user_info->password.hash.lanman,
 185                                              user_info->password.hash.nt,
 186                                              user_info->mapped.account_name,
 187                                              lm_pwd, nt_pwd);
 188                 NT_STATUS_NOT_OK_RETURN(status);
 189                 break;
 190
 191         case AUTH_PASSWORD_RESPONSE:
 192                 status = ntlm_password_check(mem_ctx, user_info->logon_parameters,
 193                                              &auth_context->challenge.data,
 194                                              &user_info->password.response.lanman,
 195                                              &user_info->password.response.nt,
 196                                              user_info->mapped.account_name,
 197                                              user_info->client.account_name,
 198                                              user_info->client.domain_name,
 199                                              lm_pwd, nt_pwd,
 200                                              user_sess_key, lm_sess_key);
 201                 NT_STATUS_NOT_OK_RETURN(status);
 202                 break;
 203         }
 204
 205         if (user_sess_key && user_sess_key->data) {
 206                 talloc_steal(auth_context, user_sess_key->data);
 207         }
 208         if (lm_sess_key && lm_sess_key->data) {
 209                 talloc_steal(auth_context, lm_sess_key->data);
 210         }
 211
 212         return NT_STATUS_OK;
 213 }
 214
 215
 216
 217 static NTSTATUS authsam_authenticate(struct auth_context *auth_context,
 218                                      TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 219                                      struct ldb_message **msgs,
 220                                      struct ldb_message **msgs_domain_ref,
 221                                      const struct auth_usersupplied_info *user_info,
 222                                      DATA_BLOB *user_sess_key, DATA_BLOB *lm_sess_key)
 223 {
 224         struct samr_Password *lm_pwd, *nt_pwd;
 225         NTSTATUS nt_status;
 226         uint16_t acct_flags = samdb_result_acct_flags(msgs[0], "userAccountControl");
 227
 228         /* Quit if the account was locked out. */
 229         if (acct_flags & ACB_AUTOLOCK) {
 230                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n",
 231                          user_info->mapped.account_name));
 232                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 233         }
 234
 235         /* You can only do an interactive login to normal accounts */
 236         if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
 237                 if (!(acct_flags & ACB_NORMAL)) {
 238                         return NT_STATUS_NO_SUCH_USER;
 239                 }
 240         }
 241
 242         nt_status = samdb_result_passwords(mem_ctx, msgs[0], &lm_pwd, &nt_pwd);
 243         NT_STATUS_NOT_OK_RETURN(nt_status);
 244
 245         nt_status = authsam_password_ok(auth_context, mem_ctx,
 246                                         acct_flags, lm_pwd, nt_pwd,
 247                                         user_info, user_sess_key, lm_sess_key);
 248         NT_STATUS_NOT_OK_RETURN(nt_status);
 249
 250         nt_status = authsam_account_ok(mem_ctx, sam_ctx,
 251                                        user_info->logon_parameters,
 252                                        msgs[0],
 253                                        msgs_domain_ref[0],
 254                                        user_info->workstation_name,
 255                                        user_info->mapped.account_name);
 256
 257         return nt_status;
 258 }
 259
 260
 261
 262 static NTSTATUS authsam_check_password_internals(struct auth_method_context *ctx,
 263                                                  TALLOC_CTX *mem_ctx,
 264                                                  const char *domain,
 265                                                  const struct auth_usersupplied_info *user_info,
 266                                                  struct auth_serversupplied_info **server_info)
 267 {
 268         NTSTATUS nt_status;
 269         const char *account_name = user_info->mapped.account_name;
 270         struct ldb_message **msgs;
 271         struct ldb_message **domain_ref_msgs;
 272         struct ldb_context *sam_ctx;
 273         DATA_BLOB user_sess_key, lm_sess_key;
 274         TALLOC_CTX *tmp_ctx;
 275
 276         if (!account_name || !*account_name) {
 277                 /* 'not for me' */
 278                 return NT_STATUS_NOT_IMPLEMENTED;
 279         }
 280
 281         tmp_ctx = talloc_new(mem_ctx);
 282         if (!tmp_ctx) {
 283                 return NT_STATUS_NO_MEMORY;
 284         }
 285
 286         sam_ctx = samdb_connect(tmp_ctx, system_session(mem_ctx));
 287         if (sam_ctx == NULL) {
 288                 talloc_free(tmp_ctx);
 289                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 290         }
 291
 292         nt_status = authsam_search_account(tmp_ctx, sam_ctx, account_name, domain, &msgs, &domain_ref_msgs);
 293         if (!NT_STATUS_IS_OK(nt_status)) {
 294                 talloc_free(tmp_ctx);
 295                 return nt_status;
 296         }
 297
 298         nt_status = authsam_authenticate(ctx->auth_ctx, tmp_ctx, sam_ctx, msgs, domain_ref_msgs, user_info,
 299                                          &user_sess_key, &lm_sess_key);
 300         if (!NT_STATUS_IS_OK(nt_status)) {
 301                 talloc_free(tmp_ctx);
 302                 return nt_status;
 303         }
 304
 305         nt_status = authsam_make_server_info(tmp_ctx, sam_ctx, msgs[0], domain_ref_msgs[0],
 306                                              user_sess_key, lm_sess_key,
 307                                              server_info);
 308         if (!NT_STATUS_IS_OK(nt_status)) {
 309                 talloc_free(tmp_ctx);
 310                 return nt_status;
 311         }
 312
 313         talloc_steal(mem_ctx, *server_info);
 314         talloc_free(tmp_ctx);
 315
 316         return NT_STATUS_OK;
 317 }
 318
 319 static NTSTATUS authsam_ignoredomain_want_check(struct auth_method_context *ctx,
 320                                                 TALLOC_CTX *mem_ctx,
 321                                                 const struct auth_usersupplied_info *user_info)
 322 {
 323         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 324                 return NT_STATUS_NOT_IMPLEMENTED;
 325         }
 326
 327         return NT_STATUS_OK;
 328 }
 329
 330 static NTSTATUS authsam_ignoredomain_check_password(struct auth_method_context *ctx,
 331                                                     TALLOC_CTX *mem_ctx,
 332                                                     const struct auth_usersupplied_info *user_info,
 333                                                     struct auth_serversupplied_info **server_info)
 334 {
 335         return authsam_check_password_internals(ctx, mem_ctx, NULL, user_info, server_info);
 336 }
 337
 338 /****************************************************************************
 339 Check SAM security (above) but with a few extra checks.
 340 ****************************************************************************/
 341 static NTSTATUS authsam_want_check(struct auth_method_context *ctx,
 342                                    TALLOC_CTX *mem_ctx,
 343                                    const struct auth_usersupplied_info *user_info)
 344 {
 345         BOOL is_local_name, is_my_domain;
 346
 347         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 348                 return NT_STATUS_NOT_IMPLEMENTED;
 349         }
 350
 351         is_local_name = is_myname(user_info->mapped.domain_name);
 352         is_my_domain  = strequal(user_info->mapped.domain_name, lp_workgroup());
 353
 354         /* check whether or not we service this domain/workgroup name */
 355         switch (lp_server_role()) {
 356                 case ROLE_STANDALONE:
 357                         return NT_STATUS_OK;
 358
 359                 case ROLE_DOMAIN_MEMBER:
 360                         if (!is_local_name) {
 361                                 DEBUG(6,("authsam_check_password: %s is not one of my local names (DOMAIN_MEMBER)\n",
 362                                         user_info->mapped.domain_name));
 363                                 return NT_STATUS_NOT_IMPLEMENTED;
 364                         }
 365                         return NT_STATUS_OK;
 366
 367                 case ROLE_DOMAIN_CONTROLLER:
 368                         if (!is_local_name && !is_my_domain) {
 369                                 DEBUG(6,("authsam_check_password: %s is not one of my local names or domain name (DC)\n",
 370                                         user_info->mapped.domain_name));
 371                                 return NT_STATUS_NOT_IMPLEMENTED;
 372                         }
 373                         return NT_STATUS_OK;
 374         }
 375
 376         DEBUG(6,("authsam_check_password: lp_server_role() has an undefined value\n"));
 377         return NT_STATUS_NOT_IMPLEMENTED;
 378 }
 379
 380 /****************************************************************************
 381 Check SAM security (above) but with a few extra checks.
 382 ****************************************************************************/
 383 static NTSTATUS authsam_check_password(struct auth_method_context *ctx,
 384                                        TALLOC_CTX *mem_ctx,
 385                                        const struct auth_usersupplied_info *user_info,
 386                                        struct auth_serversupplied_info **server_info)
 387 {
 388         const char *domain;
 389
 390         /* check whether or not we service this domain/workgroup name */
 391         switch (lp_server_role()) {
 392                 case ROLE_STANDALONE:
 393                 case ROLE_DOMAIN_MEMBER:
 394                         domain = lp_netbios_name();
 395                         break;
 396
 397                 case ROLE_DOMAIN_CONTROLLER:
 398                         domain = lp_workgroup();
 399                         break;
 400
 401                 default:
 402                         return NT_STATUS_NO_SUCH_USER;
 403         }
 404
 405         return authsam_check_password_internals(ctx, mem_ctx, domain, user_info, server_info);
 406 }
 407
 408 static const struct auth_operations sam_ignoredomain_ops = {
 409         .name           = "sam_ignoredomain",
 410         .get_challenge  = auth_get_challenge_not_implemented,
 411         .want_check     = authsam_ignoredomain_want_check,
 412         .check_password = authsam_ignoredomain_check_password
 413 };
 414
 415 static const struct auth_operations sam_ops = {
 416         .name           = "sam",
 417         .get_challenge  = auth_get_challenge_not_implemented,
 418         .want_check     = authsam_want_check,
 419         .check_password = authsam_check_password
 420 };
 421
 422 NTSTATUS auth_sam_init(void)
 423 {
 424         NTSTATUS ret;
 425
 426         ret = auth_register(&sam_ops);
 427         if (!NT_STATUS_IS_OK(ret)) {
 428                 DEBUG(0,("Failed to register 'sam' auth backend!\n"));
 429                 return ret;
 430         }
 431
 432         ret = auth_register(&sam_ignoredomain_ops);
 433         if (!NT_STATUS_IS_OK(ret)) {
 434                 DEBUG(0,("Failed to register 'sam_ignoredomain' auth backend!\n"));
 435                 return ret;
 436         }
 437
 438         return ret;
 439 }