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> 2001-2004
   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 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                                              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                                              auth_context->lp_ctx,
 199                                              user_info->logon_parameters,
 200                                              &auth_context->challenge.data,
 201                                              &user_info->password.response.lanman,
 202                                              &user_info->password.response.nt,
 203                                              user_info->mapped.account_name,
 204                                              user_info->client.account_name,
 205                                              user_info->client.domain_name,
 206                                              lm_pwd, nt_pwd,
 207                                              user_sess_key, lm_sess_key);
 208                 NT_STATUS_NOT_OK_RETURN(status);
 209                 break;
 210         }
 211
 212         if (user_sess_key && user_sess_key->data) {
 213                 talloc_steal(auth_context, user_sess_key->data);
 214         }
 215         if (lm_sess_key && lm_sess_key->data) {
 216                 talloc_steal(auth_context, lm_sess_key->data);
 217         }
 218
 219         return NT_STATUS_OK;
 220 }
 221
 222
 223
 224 static NTSTATUS authsam_authenticate(struct auth_context *auth_context,
 225                                      TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 226                                      struct ldb_message **msgs,
 227                                      struct ldb_message **msgs_domain_ref,
 228                                      const struct auth_usersupplied_info *user_info,
 229                                      DATA_BLOB *user_sess_key, DATA_BLOB *lm_sess_key)
 230 {
 231         struct samr_Password *lm_pwd, *nt_pwd;
 232         NTSTATUS nt_status;
 233         struct ldb_dn *domain_dn = samdb_result_dn(sam_ctx, mem_ctx, msgs_domain_ref[0], "nCName", NULL);
 234
 235         uint16_t acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx, msgs[0], domain_dn);
 236
 237         /* Quit if the account was locked out. */
 238         if (acct_flags & ACB_AUTOLOCK) {
 239                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n",
 240                          user_info->mapped.account_name));
 241                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 242         }
 243
 244         /* You can only do an interactive login to normal accounts */
 245         if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
 246                 if (!(acct_flags & ACB_NORMAL)) {
 247                         return NT_STATUS_NO_SUCH_USER;
 248                 }
 249         }
 250
 251         nt_status = samdb_result_passwords(mem_ctx, auth_context->lp_ctx, msgs[0], &lm_pwd, &nt_pwd);
 252         NT_STATUS_NOT_OK_RETURN(nt_status);
 253
 254         nt_status = authsam_password_ok(auth_context, mem_ctx,
 255                                         acct_flags, lm_pwd, nt_pwd,
 256                                         user_info, user_sess_key, lm_sess_key);
 257         NT_STATUS_NOT_OK_RETURN(nt_status);
 258
 259         nt_status = authsam_account_ok(mem_ctx, sam_ctx,
 260                                        user_info->logon_parameters,
 261                                        msgs[0],
 262                                        msgs_domain_ref[0],
 263                                        user_info->workstation_name,
 264                                        user_info->mapped.account_name);
 265
 266         return nt_status;
 267 }
 268
 269
 270
 271 static NTSTATUS authsam_check_password_internals(struct auth_method_context *ctx,
 272                                                  TALLOC_CTX *mem_ctx,
 273                                                  const char *domain,
 274                                                  const struct auth_usersupplied_info *user_info,
 275                                                  struct auth_serversupplied_info **server_info)
 276 {
 277         NTSTATUS nt_status;
 278         const char *account_name = user_info->mapped.account_name;
 279         struct ldb_message **msgs;
 280         struct ldb_message **domain_ref_msgs;
 281         struct ldb_context *sam_ctx;
 282         DATA_BLOB user_sess_key, lm_sess_key;
 283         TALLOC_CTX *tmp_ctx;
 284
 285         if (!account_name || !*account_name) {
 286                 /* 'not for me' */
 287                 return NT_STATUS_NOT_IMPLEMENTED;
 288         }
 289
 290         tmp_ctx = talloc_new(mem_ctx);
 291         if (!tmp_ctx) {
 292                 return NT_STATUS_NO_MEMORY;
 293         }
 294
 295         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));
 296         if (sam_ctx == NULL) {
 297                 talloc_free(tmp_ctx);
 298                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 299         }
 300
 301         nt_status = authsam_search_account(tmp_ctx, sam_ctx, account_name, domain, &msgs, &domain_ref_msgs);
 302         if (!NT_STATUS_IS_OK(nt_status)) {
 303                 talloc_free(tmp_ctx);
 304                 return nt_status;
 305         }
 306
 307         nt_status = authsam_authenticate(ctx->auth_ctx, tmp_ctx, sam_ctx, msgs, domain_ref_msgs, user_info,
 308                                          &user_sess_key, &lm_sess_key);
 309         if (!NT_STATUS_IS_OK(nt_status)) {
 310                 talloc_free(tmp_ctx);
 311                 return nt_status;
 312         }
 313
 314         nt_status = authsam_make_server_info(tmp_ctx, sam_ctx, lp_netbios_name(ctx->auth_ctx->lp_ctx),
 315                                              msgs[0], domain_ref_msgs[0],
 316                                              user_sess_key, lm_sess_key,
 317                                              server_info);
 318         if (!NT_STATUS_IS_OK(nt_status)) {
 319                 talloc_free(tmp_ctx);
 320                 return nt_status;
 321         }
 322
 323         talloc_steal(mem_ctx, *server_info);
 324         talloc_free(tmp_ctx);
 325
 326         return NT_STATUS_OK;
 327 }
 328
 329 static NTSTATUS authsam_ignoredomain_want_check(struct auth_method_context *ctx,
 330                                                 TALLOC_CTX *mem_ctx,
 331                                                 const struct auth_usersupplied_info *user_info)
 332 {
 333         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 334                 return NT_STATUS_NOT_IMPLEMENTED;
 335         }
 336
 337         return NT_STATUS_OK;
 338 }
 339
 340 static NTSTATUS authsam_ignoredomain_check_password(struct auth_method_context *ctx,
 341                                                     TALLOC_CTX *mem_ctx,
 342                                                     const struct auth_usersupplied_info *user_info,
 343                                                     struct auth_serversupplied_info **server_info)
 344 {
 345         return authsam_check_password_internals(ctx, mem_ctx, NULL, user_info, server_info);
 346 }
 347
 348 /****************************************************************************
 349 Check SAM security (above) but with a few extra checks.
 350 ****************************************************************************/
 351 static NTSTATUS authsam_want_check(struct auth_method_context *ctx,
 352                                    TALLOC_CTX *mem_ctx,
 353                                    const struct auth_usersupplied_info *user_info)
 354 {
 355         bool is_local_name, is_my_domain;
 356
 357         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 358                 return NT_STATUS_NOT_IMPLEMENTED;
 359         }
 360
 361         is_local_name = lp_is_myname(ctx->auth_ctx->lp_ctx,
 362                                   user_info->mapped.domain_name);
 363         is_my_domain  = lp_is_mydomain(ctx->auth_ctx->lp_ctx,
 364                                        user_info->mapped.domain_name);
 365
 366         /* check whether or not we service this domain/workgroup name */
 367         switch (lp_server_role(ctx->auth_ctx->lp_ctx)) {
 368                 case ROLE_STANDALONE:
 369                         return NT_STATUS_OK;
 370
 371                 case ROLE_DOMAIN_MEMBER:
 372                         if (!is_local_name) {
 373                                 DEBUG(6,("authsam_check_password: %s is not one of my local names (DOMAIN_MEMBER)\n",
 374                                         user_info->mapped.domain_name));
 375                                 return NT_STATUS_NOT_IMPLEMENTED;
 376                         }
 377                         return NT_STATUS_OK;
 378
 379                 case ROLE_DOMAIN_CONTROLLER:
 380                         if (!is_local_name && !is_my_domain) {
 381                                 DEBUG(6,("authsam_check_password: %s is not one of my local names or domain name (DC)\n",
 382                                         user_info->mapped.domain_name));
 383                                 return NT_STATUS_NOT_IMPLEMENTED;
 384                         }
 385                         return NT_STATUS_OK;
 386         }
 387
 388         DEBUG(6,("authsam_check_password: lp_server_role() has an undefined value\n"));
 389         return NT_STATUS_NOT_IMPLEMENTED;
 390 }
 391
 392 /****************************************************************************
 393 Check SAM security (above) but with a few extra checks.
 394 ****************************************************************************/
 395 static NTSTATUS authsam_check_password(struct auth_method_context *ctx,
 396                                        TALLOC_CTX *mem_ctx,
 397                                        const struct auth_usersupplied_info *user_info,
 398                                        struct auth_serversupplied_info **server_info)
 399 {
 400         const char *domain;
 401
 402         /* check whether or not we service this domain/workgroup name */
 403         switch (lp_server_role(ctx->auth_ctx->lp_ctx)) {
 404                 case ROLE_STANDALONE:
 405                 case ROLE_DOMAIN_MEMBER:
 406                         domain = lp_netbios_name(ctx->auth_ctx->lp_ctx);
 407                         break;
 408
 409                 case ROLE_DOMAIN_CONTROLLER:
 410                         domain = lp_workgroup(ctx->auth_ctx->lp_ctx);
 411                         break;
 412
 413                 default:
 414                         return NT_STATUS_NO_SUCH_USER;
 415         }
 416
 417         return authsam_check_password_internals(ctx, mem_ctx, domain, user_info, server_info);
 418 }
 419
 420 static const struct auth_operations sam_ignoredomain_ops = {
 421         .name           = "sam_ignoredomain",
 422         .get_challenge  = auth_get_challenge_not_implemented,
 423         .want_check     = authsam_ignoredomain_want_check,
 424         .check_password = authsam_ignoredomain_check_password
 425 };
 426
 427 static const struct auth_operations sam_ops = {
 428         .name           = "sam",
 429         .get_challenge  = auth_get_challenge_not_implemented,
 430         .want_check     = authsam_want_check,
 431         .check_password = authsam_check_password
 432 };
 433
 434 _PUBLIC_ NTSTATUS auth_sam_init(void)
 435 {
 436         NTSTATUS ret;
 437
 438         ret = auth_register(&sam_ops);
 439         if (!NT_STATUS_IS_OK(ret)) {
 440                 DEBUG(0,("Failed to register 'sam' auth backend!\n"));
 441                 return ret;
 442         }
 443
 444         ret = auth_register(&sam_ignoredomain_ops);
 445         if (!NT_STATUS_IS_OK(ret)) {
 446                 DEBUG(0,("Failed to register 'sam_ignoredomain' auth backend!\n"));
 447                 return ret;
 448         }
 449
 450         return ret;
 451 }