source4/auth/ntlm/auth_sam.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   4    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2009
   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 3 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, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "librpc/gen_ndr/ndr_netlogon.h"
  24 #include "system/time.h"
  25 #include "lib/ldb/include/ldb.h"
  26 #include "../lib/util/util_ldb.h"
  27 #include "auth/auth.h"
  28 #include "auth/ntlm/ntlm_check.h"
  29 #include "auth/ntlm/auth_proto.h"
  30 #include "auth/auth_sam.h"
  31 #include "dsdb/samdb/samdb.h"
  32 #include "libcli/security/security.h"
  33 #include "libcli/ldap/ldap_ndr.h"
  34 #include "param/param.h"
  35
  36 extern const char *user_attrs[];
  37 extern const char *domain_ref_attrs[];
  38
  39 /****************************************************************************
  40  Look for the specified user in the sam, return ldb result structures
  41 ****************************************************************************/
  42
  43 static NTSTATUS authsam_search_account(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
  44                                        const char *account_name,
  45                                        const char *domain_name,
  46                                        struct ldb_message ***ret_msgs,
  47                                        struct ldb_message ***ret_msgs_domain_ref)
  48 {
  49         struct ldb_message **msgs_tmp;
  50         struct ldb_message **msgs;
  51         struct ldb_message **msgs_domain_ref;
  52         struct ldb_dn *partitions_basedn = samdb_partitions_dn(sam_ctx, mem_ctx);
  53
  54         int ret;
  55         int ret_domain;
  56
  57         struct ldb_dn *domain_dn = NULL;
  58
  59         if (domain_name) {
  60                 domain_dn = samdb_domain_to_dn(sam_ctx, mem_ctx, domain_name);
  61                 if (!domain_dn) {
  62                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
  63                 }
  64         }
  65
  66         /* pull the user attributes */
  67         ret = gendb_search(sam_ctx, mem_ctx, domain_dn, &msgs, user_attrs,
  68                            "(&(sAMAccountName=%s)(objectclass=user))",
  69                            ldb_binary_encode_string(mem_ctx, account_name));
  70         if (ret == -1) {
  71                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  72         }
  73
  74         if (ret == 0) {
  75                 DEBUG(3,("sam_search_user: Couldn't find user [%s\\%s] in samdb, under %s\n",
  76                          domain_name, account_name, ldb_dn_get_linearized(domain_dn)));
  77                 return NT_STATUS_NO_SUCH_USER;
  78         }
  79
  80         if (ret > 1) {
  81                 DEBUG(0,("Found %d records matching user [%s]\n", ret, account_name));
  82                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  83         }
  84
  85         if (!domain_dn) {
  86                 struct dom_sid *domain_sid;
  87
  88                 domain_sid = samdb_result_sid_prefix(mem_ctx, msgs[0], "objectSid");
  89                 if (!domain_sid) {
  90                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
  91                 }
  92
  93                 /* find the domain's DN */
  94                 ret = gendb_search(sam_ctx, mem_ctx, NULL, &msgs_tmp, NULL,
  95                                    "(&(objectSid=%s)(objectClass=domain))",
  96                                    ldap_encode_ndr_dom_sid(mem_ctx, domain_sid));
  97                 if (ret == -1) {
  98                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
  99                 }
 100
 101                 if (ret == 0) {
 102                         DEBUG(3,("check_sam_security: Couldn't find domain_sid [%s] in passdb file.\n",
 103                                  dom_sid_string(mem_ctx, domain_sid)));
 104                         return NT_STATUS_NO_SUCH_USER;
 105                 }
 106
 107                 if (ret > 1) {
 108                         DEBUG(0,("Found %d records matching domain_sid [%s]\n",
 109                                  ret, dom_sid_string(mem_ctx, domain_sid)));
 110                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 111                 }
 112
 113                 domain_dn = msgs_tmp[0]->dn;
 114         }
 115
 116         ret_domain = gendb_search(sam_ctx, mem_ctx, partitions_basedn, &msgs_domain_ref, domain_ref_attrs,
 117                                   "(nCName=%s)", ldb_dn_get_linearized(domain_dn));
 118         if (ret_domain == -1) {
 119                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 120         }
 121
 122         if (ret_domain == 0) {
 123                 DEBUG(3,("check_sam_security: Couldn't find domain [%s] in passdb file.\n",
 124                          ldb_dn_get_linearized(msgs_tmp[0]->dn)));
 125                 return NT_STATUS_NO_SUCH_USER;
 126         }
 127
 128         if (ret_domain > 1) {
 129                 DEBUG(0,("Found %d records matching domain [%s]\n",
 130                          ret_domain, ldb_dn_get_linearized(msgs_tmp[0]->dn)));
 131                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 132         }
 133
 134         *ret_msgs = msgs;
 135         *ret_msgs_domain_ref = msgs_domain_ref;
 136
 137         return NT_STATUS_OK;
 138 }
 139
 140 /****************************************************************************
 141  Do a specific test for an smb password being correct, given a smb_password and
 142  the lanman and NT responses.
 143 ****************************************************************************/
 144 static NTSTATUS authsam_password_ok(struct auth_context *auth_context,
 145                                     TALLOC_CTX *mem_ctx,
 146                                     uint16_t acct_flags,
 147                                     const struct samr_Password *lm_pwd,
 148                                     const struct samr_Password *nt_pwd,
 149                                     const struct auth_usersupplied_info *user_info,
 150                                     DATA_BLOB *user_sess_key,
 151                                     DATA_BLOB *lm_sess_key)
 152 {
 153         NTSTATUS status;
 154
 155         if (acct_flags & ACB_PWNOTREQ) {
 156                 if (lp_null_passwords(auth_context->lp_ctx)) {
 157                         DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n",
 158                                  user_info->mapped.account_name));
 159                         *lm_sess_key = data_blob(NULL, 0);
 160                         *user_sess_key = data_blob(NULL, 0);
 161                         return NT_STATUS_OK;
 162                 } else {
 163                         DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n",
 164                                  user_info->mapped.account_name));
 165                         return NT_STATUS_LOGON_FAILURE;
 166                 }
 167         }
 168
 169         switch (user_info->password_state) {
 170         case AUTH_PASSWORD_PLAIN:
 171         {
 172                 const struct auth_usersupplied_info *user_info_temp;
 173                 status = encrypt_user_info(mem_ctx, auth_context,
 174                                            AUTH_PASSWORD_HASH,
 175                                            user_info, &user_info_temp);
 176                 if (!NT_STATUS_IS_OK(status)) {
 177                         DEBUG(1, ("Failed to convert plaintext password to password HASH: %s\n", nt_errstr(status)));
 178                         return status;
 179                 }
 180                 user_info = user_info_temp;
 181
 182                 /*fall through*/
 183         }
 184         case AUTH_PASSWORD_HASH:
 185                 *lm_sess_key = data_blob(NULL, 0);
 186                 *user_sess_key = data_blob(NULL, 0);
 187                 status = hash_password_check(mem_ctx,
 188                                              lp_lanman_auth(auth_context->lp_ctx),
 189                                              user_info->password.hash.lanman,
 190                                              user_info->password.hash.nt,
 191                                              user_info->mapped.account_name,
 192                                              lm_pwd, nt_pwd);
 193                 NT_STATUS_NOT_OK_RETURN(status);
 194                 break;
 195
 196         case AUTH_PASSWORD_RESPONSE:
 197                 status = ntlm_password_check(mem_ctx,
 198                                              lp_lanman_auth(auth_context->lp_ctx),
 199                                                  lp_ntlm_auth(auth_context->lp_ctx),
 200                                              user_info->logon_parameters,
 201                                              &auth_context->challenge.data,
 202                                              &user_info->password.response.lanman,
 203                                              &user_info->password.response.nt,
 204                                              user_info->mapped.account_name,
 205                                              user_info->client.account_name,
 206                                              user_info->client.domain_name,
 207                                              lm_pwd, nt_pwd,
 208                                              user_sess_key, lm_sess_key);
 209                 NT_STATUS_NOT_OK_RETURN(status);
 210                 break;
 211         }
 212
 213         if (user_sess_key && user_sess_key->data) {
 214                 talloc_steal(auth_context, user_sess_key->data);
 215         }
 216         if (lm_sess_key && lm_sess_key->data) {
 217                 talloc_steal(auth_context, lm_sess_key->data);
 218         }
 219
 220         return NT_STATUS_OK;
 221 }
 222
 223
 224
 225 static NTSTATUS authsam_authenticate(struct auth_context *auth_context,
 226                                      TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 227                                      struct ldb_message **msgs,
 228                                      struct ldb_message **msgs_domain_ref,
 229                                      const struct auth_usersupplied_info *user_info,
 230                                      DATA_BLOB *user_sess_key, DATA_BLOB *lm_sess_key)
 231 {
 232         struct samr_Password *lm_pwd, *nt_pwd;
 233         NTSTATUS nt_status;
 234         struct ldb_dn *domain_dn = samdb_result_dn(sam_ctx, mem_ctx, msgs_domain_ref[0], "nCName", NULL);
 235
 236         uint16_t acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx, msgs[0], domain_dn);
 237
 238         /* Quit if the account was locked out. */
 239         if (acct_flags & ACB_AUTOLOCK) {
 240                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n",
 241                          user_info->mapped.account_name));
 242                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 243         }
 244
 245         /* You can only do an interactive login to normal accounts */
 246         if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
 247                 if (!(acct_flags & ACB_NORMAL)) {
 248                         return NT_STATUS_NO_SUCH_USER;
 249                 }
 250         }
 251
 252         nt_status = samdb_result_passwords(mem_ctx, auth_context->lp_ctx, msgs[0], &lm_pwd, &nt_pwd);
 253         NT_STATUS_NOT_OK_RETURN(nt_status);
 254
 255         nt_status = authsam_password_ok(auth_context, mem_ctx,
 256                                         acct_flags, lm_pwd, nt_pwd,
 257                                         user_info, user_sess_key, lm_sess_key);
 258         NT_STATUS_NOT_OK_RETURN(nt_status);
 259
 260         nt_status = authsam_account_ok(mem_ctx, sam_ctx,
 261                                        user_info->logon_parameters,
 262                                        msgs[0],
 263                                        msgs_domain_ref[0],
 264                                        user_info->workstation_name,
 265                                        user_info->mapped.account_name,
 266                                        false);
 267
 268         return nt_status;
 269 }
 270
 271
 272
 273 static NTSTATUS authsam_check_password_internals(struct auth_method_context *ctx,
 274                                                  TALLOC_CTX *mem_ctx,
 275                                                  const char *domain,
 276                                                  const struct auth_usersupplied_info *user_info,
 277                                                  struct auth_serversupplied_info **server_info)
 278 {
 279         NTSTATUS nt_status;
 280         const char *account_name = user_info->mapped.account_name;
 281         struct ldb_message **msgs;
 282         struct ldb_message **domain_ref_msgs;
 283         struct ldb_context *sam_ctx;
 284         DATA_BLOB user_sess_key, lm_sess_key;
 285         TALLOC_CTX *tmp_ctx;
 286
 287         if (!account_name || !*account_name) {
 288                 /* 'not for me' */
 289                 return NT_STATUS_NOT_IMPLEMENTED;
 290         }
 291
 292         tmp_ctx = talloc_new(mem_ctx);
 293         if (!tmp_ctx) {
 294                 return NT_STATUS_NO_MEMORY;
 295         }
 296
 297         sam_ctx = samdb_connect(tmp_ctx, ctx->auth_ctx->event_ctx, ctx->auth_ctx->lp_ctx, system_session(mem_ctx, ctx->auth_ctx->lp_ctx));
 298         if (sam_ctx == NULL) {
 299                 talloc_free(tmp_ctx);
 300                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 301         }
 302
 303         nt_status = authsam_search_account(tmp_ctx, sam_ctx, account_name, domain, &msgs, &domain_ref_msgs);
 304         if (!NT_STATUS_IS_OK(nt_status)) {
 305                 talloc_free(tmp_ctx);
 306                 return nt_status;
 307         }
 308
 309         nt_status = authsam_authenticate(ctx->auth_ctx, tmp_ctx, sam_ctx, msgs, domain_ref_msgs, user_info,
 310                                          &user_sess_key, &lm_sess_key);
 311         if (!NT_STATUS_IS_OK(nt_status)) {
 312                 talloc_free(tmp_ctx);
 313                 return nt_status;
 314         }
 315
 316         nt_status = authsam_make_server_info(tmp_ctx, sam_ctx, lp_netbios_name(ctx->auth_ctx->lp_ctx),
 317                                              msgs[0], domain_ref_msgs[0],
 318                                              user_sess_key, lm_sess_key,
 319                                              server_info);
 320         if (!NT_STATUS_IS_OK(nt_status)) {
 321                 talloc_free(tmp_ctx);
 322                 return nt_status;
 323         }
 324
 325         talloc_steal(mem_ctx, *server_info);
 326         talloc_free(tmp_ctx);
 327
 328         return NT_STATUS_OK;
 329 }
 330
 331 static NTSTATUS authsam_ignoredomain_want_check(struct auth_method_context *ctx,
 332                                                 TALLOC_CTX *mem_ctx,
 333                                                 const struct auth_usersupplied_info *user_info)
 334 {
 335         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 336                 return NT_STATUS_NOT_IMPLEMENTED;
 337         }
 338
 339         return NT_STATUS_OK;
 340 }
 341
 342 static NTSTATUS authsam_ignoredomain_check_password(struct auth_method_context *ctx,
 343                                                     TALLOC_CTX *mem_ctx,
 344                                                     const struct auth_usersupplied_info *user_info,
 345                                                     struct auth_serversupplied_info **server_info)
 346 {
 347         return authsam_check_password_internals(ctx, mem_ctx, NULL, user_info, server_info);
 348 }
 349
 350 /****************************************************************************
 351 Check SAM security (above) but with a few extra checks.
 352 ****************************************************************************/
 353 static NTSTATUS authsam_want_check(struct auth_method_context *ctx,
 354                                    TALLOC_CTX *mem_ctx,
 355                                    const struct auth_usersupplied_info *user_info)
 356 {
 357         bool is_local_name, is_my_domain;
 358
 359         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 360                 return NT_STATUS_NOT_IMPLEMENTED;
 361         }
 362
 363         is_local_name = lp_is_myname(ctx->auth_ctx->lp_ctx,
 364                                   user_info->mapped.domain_name);
 365         is_my_domain  = lp_is_mydomain(ctx->auth_ctx->lp_ctx,
 366                                        user_info->mapped.domain_name);
 367
 368         /* check whether or not we service this domain/workgroup name */
 369         switch (lp_server_role(ctx->auth_ctx->lp_ctx)) {
 370                 case ROLE_STANDALONE:
 371                         return NT_STATUS_OK;
 372
 373                 case ROLE_DOMAIN_MEMBER:
 374                         if (!is_local_name) {
 375                                 DEBUG(6,("authsam_check_password: %s is not one of my local names (DOMAIN_MEMBER)\n",
 376                                         user_info->mapped.domain_name));
 377                                 return NT_STATUS_NOT_IMPLEMENTED;
 378                         }
 379                         return NT_STATUS_OK;
 380
 381                 case ROLE_DOMAIN_CONTROLLER:
 382                         if (!is_local_name && !is_my_domain) {
 383                                 DEBUG(6,("authsam_check_password: %s is not one of my local names or domain name (DC)\n",
 384                                         user_info->mapped.domain_name));
 385                                 return NT_STATUS_NOT_IMPLEMENTED;
 386                         }
 387                         return NT_STATUS_OK;
 388         }
 389
 390         DEBUG(6,("authsam_check_password: lp_server_role() has an undefined value\n"));
 391         return NT_STATUS_NOT_IMPLEMENTED;
 392 }
 393
 394 /****************************************************************************
 395 Check SAM security (above) but with a few extra checks.
 396 ****************************************************************************/
 397 static NTSTATUS authsam_check_password(struct auth_method_context *ctx,
 398                                        TALLOC_CTX *mem_ctx,
 399                                        const struct auth_usersupplied_info *user_info,
 400                                        struct auth_serversupplied_info **server_info)
 401 {
 402         const char *domain;
 403
 404         /* check whether or not we service this domain/workgroup name */
 405         switch (lp_server_role(ctx->auth_ctx->lp_ctx)) {
 406                 case ROLE_STANDALONE:
 407                 case ROLE_DOMAIN_MEMBER:
 408                         domain = lp_netbios_name(ctx->auth_ctx->lp_ctx);
 409                         break;
 410
 411                 case ROLE_DOMAIN_CONTROLLER:
 412                         domain = lp_workgroup(ctx->auth_ctx->lp_ctx);
 413                         break;
 414
 415                 default:
 416                         return NT_STATUS_NO_SUCH_USER;
 417         }
 418
 419         return authsam_check_password_internals(ctx, mem_ctx, domain, user_info, server_info);
 420 }
 421
 422
 423 /* Used in the gensec_gssapi and gensec_krb5 server-side code, where the PAC isn't available */
 424 NTSTATUS authsam_get_server_info_principal(TALLOC_CTX *mem_ctx,
 425                                            struct auth_context *auth_context,
 426                                            const char *principal,
 427                                            struct auth_serversupplied_info **server_info)
 428 {
 429         NTSTATUS nt_status;
 430         DATA_BLOB user_sess_key = data_blob(NULL, 0);
 431         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
 432
 433         struct ldb_message **msgs;
 434         struct ldb_message **msgs_domain_ref;
 435         struct ldb_context *sam_ctx;
 436
 437         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 438         if (!tmp_ctx) {
 439                 return NT_STATUS_NO_MEMORY;
 440         }
 441
 442         sam_ctx = samdb_connect(tmp_ctx, auth_context->event_ctx, auth_context->lp_ctx,
 443                                 system_session(tmp_ctx, auth_context->lp_ctx));
 444         if (sam_ctx == NULL) {
 445                 talloc_free(tmp_ctx);
 446                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 447         }
 448
 449         nt_status = sam_get_results_principal(sam_ctx, tmp_ctx, principal,
 450                                               &msgs, &msgs_domain_ref);
 451         if (!NT_STATUS_IS_OK(nt_status)) {
 452                 return nt_status;
 453         }
 454
 455         nt_status = authsam_make_server_info(tmp_ctx, sam_ctx,
 456                                              lp_netbios_name(auth_context->lp_ctx),
 457                                              msgs[0], msgs_domain_ref[0],
 458                                              user_sess_key, lm_sess_key,
 459                                              server_info);
 460         if (NT_STATUS_IS_OK(nt_status)) {
 461                 talloc_steal(mem_ctx, *server_info);
 462         }
 463         talloc_free(tmp_ctx);
 464         return nt_status;
 465 }
 466
 467 static const struct auth_operations sam_ignoredomain_ops = {
 468         .name                      = "sam_ignoredomain",
 469         .get_challenge             = auth_get_challenge_not_implemented,
 470         .want_check                = authsam_ignoredomain_want_check,
 471         .check_password            = authsam_ignoredomain_check_password,
 472         .get_server_info_principal = authsam_get_server_info_principal
 473 };
 474
 475 static const struct auth_operations sam_ops = {
 476         .name                      = "sam",
 477         .get_challenge             = auth_get_challenge_not_implemented,
 478         .want_check                = authsam_want_check,
 479         .check_password            = authsam_check_password,
 480         .get_server_info_principal = authsam_get_server_info_principal
 481 };
 482
 483 _PUBLIC_ NTSTATUS auth_sam_init(void)
 484 {
 485         NTSTATUS ret;
 486
 487         ret = auth_register(&sam_ops);
 488         if (!NT_STATUS_IS_OK(ret)) {
 489                 DEBUG(0,("Failed to register 'sam' auth backend!\n"));
 490                 return ret;
 491         }
 492
 493         ret = auth_register(&sam_ignoredomain_ops);
 494         if (!NT_STATUS_IS_OK(ret)) {
 495                 DEBUG(0,("Failed to register 'sam_ignoredomain' auth backend!\n"));
 496                 return ret;
 497         }
 498
 499         return ret;
 500 }