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