source4/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 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 "db_wrap.h"
  26 #include "lib/ldb/include/ldb.h"
  27 #include "auth/auth.h"
  28 #include "auth/auth_sam.h"
  29 #include "dsdb/samdb/samdb.h"
  30 #include "libcli/security/security.h"
  31 #include "libcli/ldap/ldap.h"
  32
  33 extern const char *user_attrs[];
  34 extern const char *domain_ref_attrs[];
  35
  36 /****************************************************************************
  37  Look for the specified user in the sam, return ldb result structures
  38 ****************************************************************************/
  39
  40 static NTSTATUS authsam_search_account(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
  41                                        const char *account_name,
  42                                        const char *domain_name,
  43                                        struct ldb_message ***ret_msgs,
  44                                        struct ldb_message ***ret_msgs_domain_ref)
  45 {
  46         struct ldb_message **msgs_tmp;
  47         struct ldb_message **msgs;
  48         struct ldb_message **msgs_domain_ref;
  49         struct ldb_dn *partitions_basedn = samdb_partitions_dn(sam_ctx, mem_ctx);
  50
  51         int ret;
  52         int ret_domain;
  53
  54         struct ldb_dn *domain_dn = NULL;
  55
  56         if (domain_name) {
  57                 domain_dn = samdb_domain_to_dn(sam_ctx, mem_ctx, domain_name);
  58                 if (!domain_dn) {
  59                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
  60                 }
  61         }
  62
  63         /* pull the user attributes */
  64         ret = gendb_search(sam_ctx, mem_ctx, domain_dn, &msgs, user_attrs,
  65                            "(&(sAMAccountName=%s)(objectclass=user))",
  66                            ldb_binary_encode_string(mem_ctx, account_name));
  67         if (ret == -1) {
  68                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  69         }
  70
  71         if (ret == 0) {
  72                 DEBUG(3,("sam_search_user: Couldn't find user [%s\\%s] in samdb, under %s\n",
  73                          domain_name, account_name, ldb_dn_get_linearized(domain_dn)));
  74                 return NT_STATUS_NO_SUCH_USER;
  75         }
  76
  77         if (ret > 1) {
  78                 DEBUG(0,("Found %d records matching user [%s]\n", ret, account_name));
  79                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  80         }
  81
  82         if (!domain_dn) {
  83                 struct dom_sid *domain_sid;
  84
  85                 domain_sid = samdb_result_sid_prefix(mem_ctx, msgs[0], "objectSid");
  86                 if (!domain_sid) {
  87                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
  88                 }
  89
  90                 /* find the domain's DN */
  91                 ret = gendb_search(sam_ctx, mem_ctx, NULL, &msgs_tmp, NULL,
  92                                    "(&(objectSid=%s)(objectClass=domain))",
  93                                    ldap_encode_ndr_dom_sid(mem_ctx, domain_sid));
  94                 if (ret == -1) {
  95                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
  96                 }
  97
  98                 if (ret == 0) {
  99                         DEBUG(3,("check_sam_security: Couldn't find domain_sid [%s] in passdb file.\n",
 100                                  dom_sid_string(mem_ctx, domain_sid)));
 101                         return NT_STATUS_NO_SUCH_USER;
 102                 }
 103
 104                 if (ret > 1) {
 105                         DEBUG(0,("Found %d records matching domain_sid [%s]\n",
 106                                  ret, dom_sid_string(mem_ctx, domain_sid)));
 107                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 108                 }
 109
 110                 domain_dn = msgs_tmp[0]->dn;
 111         }
 112
 113         ret_domain = gendb_search(sam_ctx, mem_ctx, partitions_basedn, &msgs_domain_ref, domain_ref_attrs,
 114                                   "(nCName=%s)", ldb_dn_get_linearized(domain_dn));
 115         if (ret_domain == -1) {
 116                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 117         }
 118
 119         if (ret_domain == 0) {
 120                 DEBUG(3,("check_sam_security: Couldn't find domain [%s] in passdb file.\n",
 121                          ldb_dn_get_linearized(msgs_tmp[0]->dn)));
 122                 return NT_STATUS_NO_SUCH_USER;
 123         }
 124
 125         if (ret_domain > 1) {
 126                 DEBUG(0,("Found %d records matching domain [%s]\n",
 127                          ret_domain, ldb_dn_get_linearized(msgs_tmp[0]->dn)));
 128                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 129         }
 130
 131         *ret_msgs = msgs;
 132         *ret_msgs_domain_ref = msgs_domain_ref;
 133
 134         return NT_STATUS_OK;
 135 }
 136
 137 /****************************************************************************
 138  Do a specific test for an smb password being correct, given a smb_password and
 139  the lanman and NT responses.
 140 ****************************************************************************/
 141 static NTSTATUS authsam_password_ok(struct auth_context *auth_context,
 142                                     TALLOC_CTX *mem_ctx,
 143                                     uint16_t acct_flags,
 144                                     const struct samr_Password *lm_pwd,
 145                                     const struct samr_Password *nt_pwd,
 146                                     const struct auth_usersupplied_info *user_info,
 147                                     DATA_BLOB *user_sess_key,
 148                                     DATA_BLOB *lm_sess_key)
 149 {
 150         NTSTATUS status;
 151
 152         if (acct_flags & ACB_PWNOTREQ) {
 153                 if (lp_null_passwords()) {
 154                         DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n",
 155                                  user_info->mapped.account_name));
 156                         return NT_STATUS_OK;
 157                 } else {
 158                         DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n",
 159                                  user_info->mapped.account_name));
 160                         return NT_STATUS_LOGON_FAILURE;
 161                 }
 162         }
 163
 164         switch (user_info->password_state) {
 165         case AUTH_PASSWORD_PLAIN:
 166         {
 167                 const struct auth_usersupplied_info *user_info_temp;
 168                 status = encrypt_user_info(mem_ctx, auth_context,
 169                                            AUTH_PASSWORD_HASH,
 170                                            user_info, &user_info_temp);
 171                 if (!NT_STATUS_IS_OK(status)) {
 172                         DEBUG(1, ("Failed to convert plaintext password to password HASH: %s\n", nt_errstr(status)));
 173                         return status;
 174                 }
 175                 user_info = user_info_temp;
 176
 177                 /*fall through*/
 178         }
 179         case AUTH_PASSWORD_HASH:
 180                 *lm_sess_key = data_blob(NULL, 0);
 181                 *user_sess_key = data_blob(NULL, 0);
 182                 status = hash_password_check(mem_ctx,
 183                                              user_info->password.hash.lanman,
 184                                              user_info->password.hash.nt,
 185                                              user_info->mapped.account_name,
 186                                              lm_pwd, nt_pwd);
 187                 NT_STATUS_NOT_OK_RETURN(status);
 188                 break;
 189
 190         case AUTH_PASSWORD_RESPONSE:
 191                 status = ntlm_password_check(mem_ctx, user_info->logon_parameters,
 192                                              &auth_context->challenge.data,
 193                                              &user_info->password.response.lanman,
 194                                              &user_info->password.response.nt,
 195                                              user_info->mapped.account_name,
 196                                              user_info->client.account_name,
 197                                              user_info->client.domain_name,
 198                                              lm_pwd, nt_pwd,
 199                                              user_sess_key, lm_sess_key);
 200                 NT_STATUS_NOT_OK_RETURN(status);
 201                 break;
 202         }
 203
 204         if (user_sess_key && user_sess_key->data) {
 205                 talloc_steal(auth_context, user_sess_key->data);
 206         }
 207         if (lm_sess_key && lm_sess_key->data) {
 208                 talloc_steal(auth_context, lm_sess_key->data);
 209         }
 210
 211         return NT_STATUS_OK;
 212 }
 213
 214
 215
 216 static NTSTATUS authsam_authenticate(struct auth_context *auth_context,
 217                                      TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 218                                      struct ldb_message **msgs,
 219                                      struct ldb_message **msgs_domain_ref,
 220                                      const struct auth_usersupplied_info *user_info,
 221                                      DATA_BLOB *user_sess_key, DATA_BLOB *lm_sess_key)
 222 {
 223         struct samr_Password *lm_pwd, *nt_pwd;
 224         NTSTATUS nt_status;
 225         uint16_t acct_flags = samdb_result_acct_flags(msgs[0], "userAccountControl");
 226
 227         /* Quit if the account was locked out. */
 228         if (acct_flags & ACB_AUTOLOCK) {
 229                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n",
 230                          user_info->mapped.account_name));
 231                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 232         }
 233
 234         /* You can only do an interactive login to normal accounts */
 235         if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
 236                 if (!(acct_flags & ACB_NORMAL)) {
 237                         return NT_STATUS_NO_SUCH_USER;
 238                 }
 239         }
 240
 241         nt_status = samdb_result_passwords(mem_ctx, msgs[0], &lm_pwd, &nt_pwd);
 242         NT_STATUS_NOT_OK_RETURN(nt_status);
 243
 244         nt_status = authsam_password_ok(auth_context, mem_ctx,
 245                                         acct_flags, lm_pwd, nt_pwd,
 246                                         user_info, user_sess_key, lm_sess_key);
 247         NT_STATUS_NOT_OK_RETURN(nt_status);
 248
 249         nt_status = authsam_account_ok(mem_ctx, sam_ctx,
 250                                        user_info->logon_parameters,
 251                                        msgs[0],
 252                                        msgs_domain_ref[0],
 253                                        user_info->workstation_name,
 254                                        user_info->mapped.account_name);
 255
 256         return nt_status;
 257 }
 258
 259
 260
 261 static NTSTATUS authsam_check_password_internals(struct auth_method_context *ctx,
 262                                                  TALLOC_CTX *mem_ctx,
 263                                                  const char *domain,
 264                                                  const struct auth_usersupplied_info *user_info,
 265                                                  struct auth_serversupplied_info **server_info)
 266 {
 267         NTSTATUS nt_status;
 268         const char *account_name = user_info->mapped.account_name;
 269         struct ldb_message **msgs;
 270         struct ldb_message **domain_ref_msgs;
 271         struct ldb_context *sam_ctx;
 272         DATA_BLOB user_sess_key, lm_sess_key;
 273         TALLOC_CTX *tmp_ctx;
 274
 275         if (!account_name || !*account_name) {
 276                 /* 'not for me' */
 277                 return NT_STATUS_NOT_IMPLEMENTED;
 278         }
 279
 280         tmp_ctx = talloc_new(mem_ctx);
 281         if (!tmp_ctx) {
 282                 return NT_STATUS_NO_MEMORY;
 283         }
 284
 285         sam_ctx = samdb_connect(tmp_ctx, system_session(mem_ctx));
 286         if (sam_ctx == NULL) {
 287                 talloc_free(tmp_ctx);
 288                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 289         }
 290
 291         nt_status = authsam_search_account(tmp_ctx, sam_ctx, account_name, domain, &msgs, &domain_ref_msgs);
 292         if (!NT_STATUS_IS_OK(nt_status)) {
 293                 talloc_free(tmp_ctx);
 294                 return nt_status;
 295         }
 296
 297         nt_status = authsam_authenticate(ctx->auth_ctx, tmp_ctx, sam_ctx, msgs, domain_ref_msgs, user_info,
 298                                          &user_sess_key, &lm_sess_key);
 299         if (!NT_STATUS_IS_OK(nt_status)) {
 300                 talloc_free(tmp_ctx);
 301                 return nt_status;
 302         }
 303
 304         nt_status = authsam_make_server_info(tmp_ctx, sam_ctx, msgs[0], domain_ref_msgs[0],
 305                                              user_sess_key, lm_sess_key,
 306                                              server_info);
 307         if (!NT_STATUS_IS_OK(nt_status)) {
 308                 talloc_free(tmp_ctx);
 309                 return nt_status;
 310         }
 311
 312         talloc_steal(mem_ctx, *server_info);
 313         talloc_free(tmp_ctx);
 314
 315         return NT_STATUS_OK;
 316 }
 317
 318 static NTSTATUS authsam_ignoredomain_want_check(struct auth_method_context *ctx,
 319                                                 TALLOC_CTX *mem_ctx,
 320                                                 const struct auth_usersupplied_info *user_info)
 321 {
 322         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 323                 return NT_STATUS_NOT_IMPLEMENTED;
 324         }
 325
 326         return NT_STATUS_OK;
 327 }
 328
 329 static NTSTATUS authsam_ignoredomain_check_password(struct auth_method_context *ctx,
 330                                                     TALLOC_CTX *mem_ctx,
 331                                                     const struct auth_usersupplied_info *user_info,
 332                                                     struct auth_serversupplied_info **server_info)
 333 {
 334         return authsam_check_password_internals(ctx, mem_ctx, NULL, user_info, server_info);
 335 }
 336
 337 /****************************************************************************
 338 Check SAM security (above) but with a few extra checks.
 339 ****************************************************************************/
 340 static NTSTATUS authsam_want_check(struct auth_method_context *ctx,
 341                                    TALLOC_CTX *mem_ctx,
 342                                    const struct auth_usersupplied_info *user_info)
 343 {
 344         BOOL is_local_name, is_my_domain;
 345
 346         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 347                 return NT_STATUS_NOT_IMPLEMENTED;
 348         }
 349
 350         is_local_name = is_myname(user_info->mapped.domain_name);
 351         is_my_domain  = strequal(user_info->mapped.domain_name, lp_workgroup());
 352
 353         /* check whether or not we service this domain/workgroup name */
 354         switch (lp_server_role()) {
 355                 case ROLE_STANDALONE:
 356                         return NT_STATUS_OK;
 357
 358                 case ROLE_DOMAIN_MEMBER:
 359                         if (!is_local_name) {
 360                                 DEBUG(6,("authsam_check_password: %s is not one of my local names (DOMAIN_MEMBER)\n",
 361                                         user_info->mapped.domain_name));
 362                                 return NT_STATUS_NOT_IMPLEMENTED;
 363                         }
 364                         return NT_STATUS_OK;
 365
 366                 case ROLE_DOMAIN_CONTROLLER:
 367                         if (!is_local_name && !is_my_domain) {
 368                                 DEBUG(6,("authsam_check_password: %s is not one of my local names or domain name (DC)\n",
 369                                         user_info->mapped.domain_name));
 370                                 return NT_STATUS_NOT_IMPLEMENTED;
 371                         }
 372                         return NT_STATUS_OK;
 373         }
 374
 375         DEBUG(6,("authsam_check_password: lp_server_role() has an undefined value\n"));
 376         return NT_STATUS_NOT_IMPLEMENTED;
 377 }
 378
 379 /****************************************************************************
 380 Check SAM security (above) but with a few extra checks.
 381 ****************************************************************************/
 382 static NTSTATUS authsam_check_password(struct auth_method_context *ctx,
 383                                        TALLOC_CTX *mem_ctx,
 384                                        const struct auth_usersupplied_info *user_info,
 385                                        struct auth_serversupplied_info **server_info)
 386 {
 387         const char *domain;
 388
 389         /* check whether or not we service this domain/workgroup name */
 390         switch (lp_server_role()) {
 391                 case ROLE_STANDALONE:
 392                 case ROLE_DOMAIN_MEMBER:
 393                         domain = lp_netbios_name();
 394                         break;
 395
 396                 case ROLE_DOMAIN_CONTROLLER:
 397                         domain = lp_workgroup();
 398                         break;
 399
 400                 default:
 401                         return NT_STATUS_NO_SUCH_USER;
 402         }
 403
 404         return authsam_check_password_internals(ctx, mem_ctx, domain, user_info, server_info);
 405 }
 406
 407 static const struct auth_operations sam_ignoredomain_ops = {
 408         .name           = "sam_ignoredomain",
 409         .get_challenge  = auth_get_challenge_not_implemented,
 410         .want_check     = authsam_ignoredomain_want_check,
 411         .check_password = authsam_ignoredomain_check_password
 412 };
 413
 414 static const struct auth_operations sam_ops = {
 415         .name           = "sam",
 416         .get_challenge  = auth_get_challenge_not_implemented,
 417         .want_check     = authsam_want_check,
 418         .check_password = authsam_check_password
 419 };
 420
 421 NTSTATUS auth_sam_init(void)
 422 {
 423         NTSTATUS ret;
 424
 425         ret = auth_register(&sam_ops);
 426         if (!NT_STATUS_IS_OK(ret)) {
 427                 DEBUG(0,("Failed to register 'sam' auth backend!\n"));
 428                 return ret;
 429         }
 430
 431         ret = auth_register(&sam_ignoredomain_ops);
 432         if (!NT_STATUS_IS_OK(ret)) {
 433                 DEBUG(0,("Failed to register 'sam_ignoredomain' auth backend!\n"));
 434                 return ret;
 435         }
 436
 437         return ret;
 438 }