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