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