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 "system/time.h"
  25 #include "db_wrap.h"
  26 #include "auth/auth.h"
  27 #include "auth/auth_sam.h"
  28 #include "dsdb/samdb/samdb.h"
  29 #include "libcli/security/security.h"
  30 #include "libcli/ldap/ldap.h"
  31
  32 extern const char *user_attrs[];
  33 extern const char *domain_ref_attrs[];
  34
  35 /****************************************************************************
  36  Look for the specified user in the sam, return ldb result structures
  37 ****************************************************************************/
  38
  39 static NTSTATUS authsam_search_account(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
  40                                        const char *account_name,
  41                                        const char *domain_name,
  42                                        struct ldb_message ***ret_msgs,
  43                                        struct ldb_message ***ret_msgs_domain_ref)
  44 {
  45         struct ldb_message **msgs_tmp;
  46         struct ldb_message **msgs;
  47         struct ldb_message **msgs_domain_ref;
  48         const struct ldb_dn *partitions_basedn = ldb_dn_string_compose(mem_ctx, samdb_base_dn(mem_ctx), "CN=Partitions,CN=Configuration");
  49
  50         int ret;
  51         int ret_domain;
  52
  53         const struct ldb_dn *domain_dn = NULL;
  54
  55         if (domain_name) {
  56                 char *escaped_domain = ldb_binary_encode_string(mem_ctx, domain_name);
  57                 /* find the domain's DN */
  58                 ret_domain = gendb_search(sam_ctx, mem_ctx, partitions_basedn, &msgs_domain_ref, domain_ref_attrs,
  59                                           "(&(&(|(&(dnsRoot=%s)(nETBIOSName=*))(nETBIOSName=%s))(objectclass=crossRef))(ncName=*))",
  60                                           escaped_domain, escaped_domain);
  61                 if (ret_domain == -1) {
  62                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
  63                 }
  64
  65                 if (ret_domain == 0) {
  66                         DEBUG(3,("sam_search_user: Couldn't find domain [%s] in samdb.\n",
  67                                  domain_name));
  68                         return NT_STATUS_NO_SUCH_USER;
  69                 }
  70
  71                 if (ret_domain > 1) {
  72                         DEBUG(0,("Found %d records matching domain [%s]\n",
  73                                  ret_domain, domain_name));
  74                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
  75                 }
  76
  77                 domain_dn = samdb_result_dn(mem_ctx, msgs_domain_ref[0], "nCName", NULL);
  78         } else {
  79                 domain_dn = samdb_base_dn(mem_ctx);
  80         }
  81
  82         /* pull the user attributes */
  83         ret = gendb_search(sam_ctx, mem_ctx, domain_dn, &msgs, user_attrs,
  84                            "(&(sAMAccountName=%s)(objectclass=user))",
  85                            ldb_binary_encode_string(mem_ctx, account_name));
  86         if (ret == -1) {
  87                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  88         }
  89
  90         if (ret == 0) {
  91                 DEBUG(3,("sam_search_user: Couldn't find user [%s\\%s] in samdb, under %s\n",
  92                          domain_name, account_name, ldb_dn_linearize(mem_ctx, domain_dn)));
  93                 return NT_STATUS_NO_SUCH_USER;
  94         }
  95
  96         if (ret > 1) {
  97                 DEBUG(0,("Found %d records matching user [%s]\n", ret, account_name));
  98                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  99         }
 100
 101         if (!domain_name) {
 102                 struct dom_sid *domain_sid;
 103
 104                 domain_sid = samdb_result_sid_prefix(mem_ctx, msgs[0], "objectSid");
 105                 if (!domain_sid) {
 106                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 107                 }
 108
 109                 /* find the domain's DN */
 110                 ret = gendb_search(sam_ctx, mem_ctx, samdb_base_dn(mem_ctx), &msgs_tmp, NULL,
 111                                    "(&(objectSid=%s)(objectclass=domain))",
 112                                    ldap_encode_ndr_dom_sid(mem_ctx, domain_sid));
 113                 if (ret == -1) {
 114                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 115                 }
 116
 117                 if (ret == 0) {
 118                         DEBUG(3,("check_sam_security: Couldn't find domain_sid [%s] in passdb file.\n",
 119                                  dom_sid_string(mem_ctx, domain_sid)));
 120                         return NT_STATUS_NO_SUCH_USER;
 121                 }
 122
 123                 if (ret > 1) {
 124                         DEBUG(0,("Found %d records matching domain_sid [%s]\n",
 125                                  ret, dom_sid_string(mem_ctx, domain_sid)));
 126                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 127                 }
 128
 129                 ret_domain = gendb_search(sam_ctx, mem_ctx, partitions_basedn, &msgs_domain_ref, domain_ref_attrs,
 130                                           "(nCName=%s)", ldb_dn_linearize(msgs_tmp, msgs_tmp[0]->dn));
 131
 132                 if (ret_domain == -1) {
 133                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 134                 }
 135
 136                 if (ret_domain == 0) {
 137                         DEBUG(3,("check_sam_security: Couldn't find domain [%s] in passdb file.\n",
 138                                  ldb_dn_linearize(msgs_tmp, msgs_tmp[0]->dn)));
 139                         return NT_STATUS_NO_SUCH_USER;
 140                 }
 141
 142                 if (ret_domain > 1) {
 143                         DEBUG(0,("Found %d records matching domain [%s]\n",
 144                                  ret_domain, ldb_dn_linearize(msgs_tmp, msgs_tmp[0]->dn)));
 145                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 146                 }
 147
 148         }
 149
 150         *ret_msgs = msgs;
 151         *ret_msgs_domain_ref = msgs_domain_ref;
 152
 153         return NT_STATUS_OK;
 154 }
 155
 156 /****************************************************************************
 157  Do a specific test for an smb password being correct, given a smb_password and
 158  the lanman and NT responses.
 159 ****************************************************************************/
 160 static NTSTATUS authsam_password_ok(struct auth_context *auth_context,
 161                                     TALLOC_CTX *mem_ctx,
 162                                     uint16_t acct_flags,
 163                                     const struct samr_Password *lm_pwd,
 164                                     const struct samr_Password *nt_pwd,
 165                                     const struct auth_usersupplied_info *user_info,
 166                                     DATA_BLOB *user_sess_key,
 167                                     DATA_BLOB *lm_sess_key)
 168 {
 169         NTSTATUS status;
 170
 171         if (acct_flags & ACB_PWNOTREQ) {
 172                 if (lp_null_passwords()) {
 173                         DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n",
 174                                  user_info->mapped.account_name));
 175                         return NT_STATUS_OK;
 176                 } else {
 177                         DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n",
 178                                  user_info->mapped.account_name));
 179                         return NT_STATUS_LOGON_FAILURE;
 180                 }
 181         }
 182
 183         switch (user_info->password_state) {
 184         case AUTH_PASSWORD_PLAIN:
 185         {
 186                 const struct auth_usersupplied_info *user_info_temp;
 187                 status = encrypt_user_info(mem_ctx, auth_context,
 188                                            AUTH_PASSWORD_HASH,
 189                                            user_info, &user_info_temp);
 190                 if (!NT_STATUS_IS_OK(status)) {
 191                         DEBUG(1, ("Failed to convert plaintext password to password HASH: %s\n", nt_errstr(status)));
 192                         return status;
 193                 }
 194                 user_info = user_info_temp;
 195
 196                 /*fall through*/
 197         }
 198         case AUTH_PASSWORD_HASH:
 199                 *lm_sess_key = data_blob(NULL, 0);
 200                 *user_sess_key = data_blob(NULL, 0);
 201                 status = hash_password_check(mem_ctx,
 202                                              user_info->password.hash.lanman,
 203                                              user_info->password.hash.nt,
 204                                              user_info->mapped.account_name,
 205                                              lm_pwd, nt_pwd);
 206                 NT_STATUS_NOT_OK_RETURN(status);
 207                 break;
 208
 209         case AUTH_PASSWORD_RESPONSE:
 210                 status = ntlm_password_check(mem_ctx, user_info->logon_parameters,
 211                                              &auth_context->challenge.data,
 212                                              &user_info->password.response.lanman,
 213                                              &user_info->password.response.nt,
 214                                              user_info->mapped.account_name,
 215                                              user_info->client.account_name,
 216                                              user_info->client.domain_name,
 217                                              lm_pwd, nt_pwd,
 218                                              user_sess_key, lm_sess_key);
 219                 NT_STATUS_NOT_OK_RETURN(status);
 220                 break;
 221         }
 222
 223         if (user_sess_key && user_sess_key->data) {
 224                 talloc_steal(auth_context, user_sess_key->data);
 225         }
 226         if (lm_sess_key && lm_sess_key->data) {
 227                 talloc_steal(auth_context, lm_sess_key->data);
 228         }
 229
 230         return NT_STATUS_OK;
 231 }
 232
 233
 234
 235 static NTSTATUS authsam_authenticate(struct auth_context *auth_context,
 236                                      TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 237                                      struct ldb_message **msgs,
 238                                      struct ldb_message **msgs_domain_ref,
 239                                      const struct auth_usersupplied_info *user_info,
 240                                      DATA_BLOB *user_sess_key, DATA_BLOB *lm_sess_key)
 241 {
 242         struct samr_Password *lm_pwd, *nt_pwd;
 243         NTSTATUS nt_status;
 244         uint16_t acct_flags = samdb_result_acct_flags(msgs[0], "userAccountControl");
 245
 246         /* Quit if the account was locked out. */
 247         if (acct_flags & ACB_AUTOLOCK) {
 248                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n",
 249                          user_info->mapped.account_name));
 250                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 251         }
 252
 253         /* You can only do an interactive login to normal accounts */
 254         if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
 255                 if (!(acct_flags & ACB_NORMAL)) {
 256                         return NT_STATUS_NO_SUCH_USER;
 257                 }
 258         }
 259
 260         nt_status = samdb_result_passwords(mem_ctx, msgs[0], &lm_pwd, &nt_pwd);
 261         NT_STATUS_NOT_OK_RETURN(nt_status);
 262
 263         nt_status = authsam_password_ok(auth_context, mem_ctx,
 264                                         acct_flags, lm_pwd, nt_pwd,
 265                                         user_info, user_sess_key, lm_sess_key);
 266         NT_STATUS_NOT_OK_RETURN(nt_status);
 267
 268         nt_status = authsam_account_ok(mem_ctx, sam_ctx,
 269                                        user_info->logon_parameters,
 270                                        msgs[0],
 271                                        msgs_domain_ref[0],
 272                                        user_info->workstation_name,
 273                                        user_info->mapped.account_name);
 274
 275         return nt_status;
 276 }
 277
 278
 279
 280 static NTSTATUS authsam_check_password_internals(struct auth_method_context *ctx,
 281                                                  TALLOC_CTX *mem_ctx,
 282                                                  const char *domain,
 283                                                  const struct auth_usersupplied_info *user_info,
 284                                                  struct auth_serversupplied_info **server_info)
 285 {
 286         NTSTATUS nt_status;
 287         const char *account_name = user_info->mapped.account_name;
 288         struct ldb_message **msgs;
 289         struct ldb_message **domain_ref_msgs;
 290         struct ldb_context *sam_ctx;
 291         DATA_BLOB user_sess_key, lm_sess_key;
 292         TALLOC_CTX *tmp_ctx;
 293
 294         if (!account_name || !*account_name) {
 295                 /* 'not for me' */
 296                 return NT_STATUS_NOT_IMPLEMENTED;
 297         }
 298
 299         tmp_ctx = talloc_new(mem_ctx);
 300         if (!tmp_ctx) {
 301                 return NT_STATUS_NO_MEMORY;
 302         }
 303
 304         sam_ctx = samdb_connect(tmp_ctx, system_session(mem_ctx));
 305         if (sam_ctx == NULL) {
 306                 talloc_free(tmp_ctx);
 307                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 308         }
 309
 310         nt_status = authsam_search_account(tmp_ctx, sam_ctx, account_name, domain, &msgs, &domain_ref_msgs);
 311         if (!NT_STATUS_IS_OK(nt_status)) {
 312                 talloc_free(tmp_ctx);
 313                 return nt_status;
 314         }
 315
 316         nt_status = authsam_authenticate(ctx->auth_ctx, tmp_ctx, sam_ctx, msgs, domain_ref_msgs, user_info,
 317                                          &user_sess_key, &lm_sess_key);
 318         if (!NT_STATUS_IS_OK(nt_status)) {
 319                 talloc_free(tmp_ctx);
 320                 return nt_status;
 321         }
 322
 323         nt_status = authsam_make_server_info(tmp_ctx, sam_ctx, msgs[0], domain_ref_msgs[0],
 324                                              user_sess_key, lm_sess_key,
 325                                              server_info);
 326         if (!NT_STATUS_IS_OK(nt_status)) {
 327                 talloc_free(tmp_ctx);
 328                 return nt_status;
 329         }
 330
 331         talloc_steal(mem_ctx, *server_info);
 332         talloc_free(tmp_ctx);
 333
 334         return NT_STATUS_OK;
 335 }
 336
 337 static NTSTATUS authsam_ignoredomain_want_check(struct auth_method_context *ctx,
 338                                                 TALLOC_CTX *mem_ctx,
 339                                                 const struct auth_usersupplied_info *user_info)
 340 {
 341         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 342                 return NT_STATUS_NOT_IMPLEMENTED;
 343         }
 344
 345         return NT_STATUS_OK;
 346 }
 347
 348 static NTSTATUS authsam_ignoredomain_check_password(struct auth_method_context *ctx,
 349                                                     TALLOC_CTX *mem_ctx,
 350                                                     const struct auth_usersupplied_info *user_info,
 351                                                     struct auth_serversupplied_info **server_info)
 352 {
 353         return authsam_check_password_internals(ctx, mem_ctx, NULL, user_info, server_info);
 354 }
 355
 356 /****************************************************************************
 357 Check SAM security (above) but with a few extra checks.
 358 ****************************************************************************/
 359 static NTSTATUS authsam_want_check(struct auth_method_context *ctx,
 360                                    TALLOC_CTX *mem_ctx,
 361                                    const struct auth_usersupplied_info *user_info)
 362 {
 363         BOOL is_local_name, is_my_domain;
 364
 365         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 366                 return NT_STATUS_NOT_IMPLEMENTED;
 367         }
 368
 369         is_local_name = is_myname(user_info->mapped.domain_name);
 370         is_my_domain  = strequal(user_info->mapped.domain_name, lp_workgroup());
 371
 372         /* check whether or not we service this domain/workgroup name */
 373         switch (lp_server_role()) {
 374                 case ROLE_STANDALONE:
 375                         return NT_STATUS_OK;
 376
 377                 case ROLE_DOMAIN_MEMBER:
 378                         if (!is_local_name) {
 379                                 DEBUG(6,("authsam_check_password: %s is not one of my local names (DOMAIN_MEMBER)\n",
 380                                         user_info->mapped.domain_name));
 381                                 return NT_STATUS_NOT_IMPLEMENTED;
 382                         }
 383                         return NT_STATUS_OK;
 384
 385                 case ROLE_DOMAIN_PDC:
 386                 case ROLE_DOMAIN_BDC:
 387                         if (!is_local_name && !is_my_domain) {
 388                                 DEBUG(6,("authsam_check_password: %s is not one of my local names or domain name (DC)\n",
 389                                         user_info->mapped.domain_name));
 390                                 return NT_STATUS_NOT_IMPLEMENTED;
 391                         }
 392                         return NT_STATUS_OK;
 393         }
 394
 395         DEBUG(6,("authsam_check_password: lp_server_role() has an undefined value\n"));
 396         return NT_STATUS_NOT_IMPLEMENTED;
 397 }
 398
 399 /****************************************************************************
 400 Check SAM security (above) but with a few extra checks.
 401 ****************************************************************************/
 402 static NTSTATUS authsam_check_password(struct auth_method_context *ctx,
 403                                        TALLOC_CTX *mem_ctx,
 404                                        const struct auth_usersupplied_info *user_info,
 405                                        struct auth_serversupplied_info **server_info)
 406 {
 407         const char *domain;
 408
 409         /* check whether or not we service this domain/workgroup name */
 410         switch (lp_server_role()) {
 411                 case ROLE_STANDALONE:
 412                 case ROLE_DOMAIN_MEMBER:
 413                         domain = lp_netbios_name();
 414                         break;
 415
 416                 case ROLE_DOMAIN_PDC:
 417                 case ROLE_DOMAIN_BDC:
 418                         domain = lp_workgroup();
 419                         break;
 420
 421                 default:
 422                         return NT_STATUS_NO_SUCH_USER;
 423         }
 424
 425         return authsam_check_password_internals(ctx, mem_ctx, domain, user_info, server_info);
 426 }
 427
 428 static const struct auth_operations sam_ignoredomain_ops = {
 429         .name           = "sam_ignoredomain",
 430         .get_challenge  = auth_get_challenge_not_implemented,
 431         .want_check     = authsam_ignoredomain_want_check,
 432         .check_password = authsam_ignoredomain_check_password
 433 };
 434
 435 static const struct auth_operations sam_ops = {
 436         .name           = "sam",
 437         .get_challenge  = auth_get_challenge_not_implemented,
 438         .want_check     = authsam_want_check,
 439         .check_password = authsam_check_password
 440 };
 441
 442 NTSTATUS auth_sam_init(void)
 443 {
 444         NTSTATUS ret;
 445
 446         ret = auth_register(&sam_ops);
 447         if (!NT_STATUS_IS_OK(ret)) {
 448                 DEBUG(0,("Failed to register 'sam' auth backend!\n"));
 449                 return ret;
 450         }
 451
 452         ret = auth_register(&sam_ignoredomain_ops);
 453         if (!NT_STATUS_IS_OK(ret)) {
 454                 DEBUG(0,("Failed to register 'sam_ignoredomain' auth backend!\n"));
 455                 return ret;
 456         }
 457
 458         return ret;
 459 }