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> 2001-2009
   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 "system/time.h"
  24 #include <ldb.h>
  25 #include "libcli/ldap/ldap_ndr.h"
  26 #include "libcli/security/security.h"
  27 #include "auth/auth.h"
  28 #include "../libcli/auth/ntlm_check.h"
  29 #include "auth/ntlm/auth_proto.h"
  30 #include "auth/auth_sam.h"
  31 #include "dsdb/samdb/samdb.h"
  32 #include "dsdb/common/util.h"
  33 #include "param/param.h"
  34 #include "librpc/gen_ndr/ndr_irpc_c.h"
  35 #include "lib/messaging/irpc.h"
  36
  37 extern const char *user_attrs[];
  38 extern const char *domain_ref_attrs[];
  39
  40 /****************************************************************************
  41  Look for the specified user in the sam, return ldb result structures
  42 ****************************************************************************/
  43
  44 static NTSTATUS authsam_search_account(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
  45                                        const char *account_name,
  46                                        struct ldb_dn *domain_dn,
  47                                        struct ldb_message **ret_msg)
  48 {
  49         int ret;
  50
  51         /* pull the user attributes */
  52         ret = dsdb_search_one(sam_ctx, mem_ctx, ret_msg, domain_dn, LDB_SCOPE_SUBTREE,
  53                               user_attrs,
  54                               DSDB_SEARCH_SHOW_EXTENDED_DN,
  55                               "(&(sAMAccountName=%s)(objectclass=user))",
  56                               ldb_binary_encode_string(mem_ctx, account_name));
  57         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
  58                 DEBUG(3,("sam_search_user: Couldn't find user [%s] in samdb, under %s\n",
  59                          account_name, ldb_dn_get_linearized(domain_dn)));
  60                 return NT_STATUS_NO_SUCH_USER;
  61         }
  62         if (ret != LDB_SUCCESS) {
  63                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  64         }
  65
  66         return NT_STATUS_OK;
  67 }
  68
  69 /****************************************************************************
  70  Do a specific test for an smb password being correct, given a smb_password and
  71  the lanman and NT responses.
  72 ****************************************************************************/
  73 static NTSTATUS authsam_password_ok(struct auth_context *auth_context,
  74                                     TALLOC_CTX *mem_ctx,
  75                                     uint16_t acct_flags,
  76                                     const struct samr_Password *lm_pwd,
  77                                     const struct samr_Password *nt_pwd,
  78                                     const struct auth_usersupplied_info *user_info,
  79                                     DATA_BLOB *user_sess_key,
  80                                     DATA_BLOB *lm_sess_key)
  81 {
  82         NTSTATUS status;
  83
  84         switch (user_info->password_state) {
  85         case AUTH_PASSWORD_PLAIN:
  86         {
  87                 const struct auth_usersupplied_info *user_info_temp;
  88                 status = encrypt_user_info(mem_ctx, auth_context,
  89                                            AUTH_PASSWORD_HASH,
  90                                            user_info, &user_info_temp);
  91                 if (!NT_STATUS_IS_OK(status)) {
  92                         DEBUG(1, ("Failed to convert plaintext password to password HASH: %s\n", nt_errstr(status)));
  93                         return status;
  94                 }
  95                 user_info = user_info_temp;
  96
  97                 /*fall through*/
  98         }
  99         case AUTH_PASSWORD_HASH:
 100                 *lm_sess_key = data_blob(NULL, 0);
 101                 *user_sess_key = data_blob(NULL, 0);
 102                 status = hash_password_check(mem_ctx,
 103                                              lpcfg_lanman_auth(auth_context->lp_ctx),
 104                                              user_info->password.hash.lanman,
 105                                              user_info->password.hash.nt,
 106                                              user_info->mapped.account_name,
 107                                              lm_pwd, nt_pwd);
 108                 NT_STATUS_NOT_OK_RETURN(status);
 109                 break;
 110
 111         case AUTH_PASSWORD_RESPONSE:
 112                 status = ntlm_password_check(mem_ctx,
 113                                              lpcfg_lanman_auth(auth_context->lp_ctx),
 114                                                  lpcfg_ntlm_auth(auth_context->lp_ctx),
 115                                              user_info->logon_parameters,
 116                                              &auth_context->challenge.data,
 117                                              &user_info->password.response.lanman,
 118                                              &user_info->password.response.nt,
 119                                              user_info->mapped.account_name,
 120                                              user_info->client.account_name,
 121                                              user_info->client.domain_name,
 122                                              lm_pwd, nt_pwd,
 123                                              user_sess_key, lm_sess_key);
 124                 NT_STATUS_NOT_OK_RETURN(status);
 125                 break;
 126         }
 127
 128         if (user_sess_key && user_sess_key->data) {
 129                 talloc_steal(auth_context, user_sess_key->data);
 130         }
 131         if (lm_sess_key && lm_sess_key->data) {
 132                 talloc_steal(auth_context, lm_sess_key->data);
 133         }
 134
 135         return NT_STATUS_OK;
 136 }
 137
 138
 139 /*
 140   send a message to the drepl server telling it to initiate a
 141   REPL_SECRET getncchanges extended op to fetch the users secrets
 142  */
 143 static void auth_sam_trigger_repl_secret(TALLOC_CTX *mem_ctx, struct auth_context *auth_context,
 144                                          struct ldb_dn *user_dn)
 145 {
 146         struct dcerpc_binding_handle *irpc_handle;
 147         struct drepl_trigger_repl_secret r;
 148         struct tevent_req *req;
 149
 150         irpc_handle = irpc_binding_handle_by_name(mem_ctx, auth_context->msg_ctx,
 151                                                   "dreplsrv",
 152                                                   &ndr_table_irpc);
 153         if (irpc_handle == NULL) {
 154                 DEBUG(1,(__location__ ": Unable to get binding handle for dreplsrv\n"));
 155                 return;
 156         }
 157
 158         r.in.user_dn = ldb_dn_get_linearized(user_dn);
 159
 160         req = dcerpc_drepl_trigger_repl_secret_r_send(mem_ctx,
 161                                                       auth_context->event_ctx,
 162                                                       irpc_handle,
 163                                                       &r);
 164
 165         /* we aren't interested in a reply */
 166         talloc_free(req);
 167         talloc_free(irpc_handle);
 168 }
 169
 170
 171 static NTSTATUS authsam_authenticate(struct auth_context *auth_context,
 172                                      TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 173                                      struct ldb_dn *domain_dn,
 174                                      struct ldb_message *msg,
 175                                      const struct auth_usersupplied_info *user_info,
 176                                      DATA_BLOB *user_sess_key, DATA_BLOB *lm_sess_key)
 177 {
 178         struct samr_Password *lm_pwd, *nt_pwd;
 179         NTSTATUS nt_status;
 180
 181         uint16_t acct_flags = samdb_result_acct_flags(auth_context->sam_ctx, mem_ctx, msg, domain_dn);
 182
 183         /* Quit if the account was locked out. */
 184         if (acct_flags & ACB_AUTOLOCK) {
 185                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n",
 186                          user_info->mapped.account_name));
 187                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 188         }
 189
 190         /* You can only do an interactive login to normal accounts */
 191         if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
 192                 if (!(acct_flags & ACB_NORMAL)) {
 193                         return NT_STATUS_NO_SUCH_USER;
 194                 }
 195         }
 196
 197         nt_status = samdb_result_passwords(mem_ctx, auth_context->lp_ctx, msg, &lm_pwd, &nt_pwd);
 198         NT_STATUS_NOT_OK_RETURN(nt_status);
 199
 200         if (lm_pwd == NULL && nt_pwd == NULL) {
 201                 bool am_rodc;
 202                 if (samdb_rodc(auth_context->sam_ctx, &am_rodc) == LDB_SUCCESS && am_rodc) {
 203                         /* we don't have passwords for this
 204                          * account. We are an RODC, and this account
 205                          * may be one for which we either are denied
 206                          * REPL_SECRET replication or we haven't yet
 207                          * done the replication. We return
 208                          * NT_STATUS_NOT_IMPLEMENTED which tells the
 209                          * auth code to try the next authentication
 210                          * mechanism. We also send a message to our
 211                          * drepl server to tell it to try and
 212                          * replicate the secrets for this account.
 213                          */
 214                         auth_sam_trigger_repl_secret(mem_ctx, auth_context, msg->dn);
 215                         return NT_STATUS_NOT_IMPLEMENTED;
 216                 }
 217         }
 218
 219         nt_status = authsam_password_ok(auth_context, mem_ctx,
 220                                         acct_flags, lm_pwd, nt_pwd,
 221                                         user_info, user_sess_key, lm_sess_key);
 222         NT_STATUS_NOT_OK_RETURN(nt_status);
 223
 224         nt_status = authsam_account_ok(mem_ctx, auth_context->sam_ctx,
 225                                        user_info->logon_parameters,
 226                                        domain_dn,
 227                                        msg,
 228                                        user_info->workstation_name,
 229                                        user_info->mapped.account_name,
 230                                        false, false);
 231
 232         return nt_status;
 233 }
 234
 235
 236
 237 static NTSTATUS authsam_check_password_internals(struct auth_method_context *ctx,
 238                                                  TALLOC_CTX *mem_ctx,
 239                                                  const struct auth_usersupplied_info *user_info,
 240                                                  struct auth_user_info_dc **user_info_dc)
 241 {
 242         NTSTATUS nt_status;
 243         const char *account_name = user_info->mapped.account_name;
 244         struct ldb_message *msg;
 245         struct ldb_dn *domain_dn;
 246         DATA_BLOB user_sess_key, lm_sess_key;
 247         TALLOC_CTX *tmp_ctx;
 248
 249         if (ctx->auth_ctx->sam_ctx == NULL) {
 250                 DEBUG(0, ("No SAM available, cannot log in users\n"));
 251                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 252         }
 253
 254         if (!account_name || !*account_name) {
 255                 /* 'not for me' */
 256                 return NT_STATUS_NOT_IMPLEMENTED;
 257         }
 258
 259         tmp_ctx = talloc_new(mem_ctx);
 260         if (!tmp_ctx) {
 261                 return NT_STATUS_NO_MEMORY;
 262         }
 263
 264         domain_dn = ldb_get_default_basedn(ctx->auth_ctx->sam_ctx);
 265         if (domain_dn == NULL) {
 266                 talloc_free(tmp_ctx);
 267                 return NT_STATUS_NO_SUCH_DOMAIN;
 268         }
 269
 270         nt_status = authsam_search_account(tmp_ctx, ctx->auth_ctx->sam_ctx, account_name, domain_dn, &msg);
 271         if (!NT_STATUS_IS_OK(nt_status)) {
 272                 talloc_free(tmp_ctx);
 273                 return nt_status;
 274         }
 275
 276         nt_status = authsam_authenticate(ctx->auth_ctx, tmp_ctx, ctx->auth_ctx->sam_ctx, domain_dn, msg, user_info,
 277                                          &user_sess_key, &lm_sess_key);
 278         if (!NT_STATUS_IS_OK(nt_status)) {
 279                 talloc_free(tmp_ctx);
 280                 return nt_status;
 281         }
 282
 283         nt_status = authsam_make_user_info_dc(tmp_ctx, ctx->auth_ctx->sam_ctx, lpcfg_netbios_name(ctx->auth_ctx->lp_ctx),
 284                                              lpcfg_sam_name(ctx->auth_ctx->lp_ctx),
 285                                              domain_dn,
 286                                              msg,
 287                                              user_sess_key, lm_sess_key,
 288                                              user_info_dc);
 289         if (!NT_STATUS_IS_OK(nt_status)) {
 290                 talloc_free(tmp_ctx);
 291                 return nt_status;
 292         }
 293
 294         talloc_steal(mem_ctx, *user_info_dc);
 295         talloc_free(tmp_ctx);
 296
 297         return NT_STATUS_OK;
 298 }
 299
 300 static NTSTATUS authsam_ignoredomain_want_check(struct auth_method_context *ctx,
 301                                                 TALLOC_CTX *mem_ctx,
 302                                                 const struct auth_usersupplied_info *user_info)
 303 {
 304         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 305                 return NT_STATUS_NOT_IMPLEMENTED;
 306         }
 307
 308         return NT_STATUS_OK;
 309 }
 310
 311 /****************************************************************************
 312 Check SAM security (above) but with a few extra checks.
 313 ****************************************************************************/
 314 static NTSTATUS authsam_want_check(struct auth_method_context *ctx,
 315                                    TALLOC_CTX *mem_ctx,
 316                                    const struct auth_usersupplied_info *user_info)
 317 {
 318         bool is_local_name, is_my_domain;
 319
 320         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 321                 return NT_STATUS_NOT_IMPLEMENTED;
 322         }
 323
 324         is_local_name = lpcfg_is_myname(ctx->auth_ctx->lp_ctx,
 325                                   user_info->mapped.domain_name);
 326         is_my_domain  = lpcfg_is_mydomain(ctx->auth_ctx->lp_ctx,
 327                                        user_info->mapped.domain_name);
 328
 329         /* check whether or not we service this domain/workgroup name */
 330         switch (lpcfg_server_role(ctx->auth_ctx->lp_ctx)) {
 331                 case ROLE_STANDALONE:
 332                         return NT_STATUS_OK;
 333
 334                 case ROLE_DOMAIN_MEMBER:
 335                         if (!is_local_name) {
 336                                 DEBUG(6,("authsam_check_password: %s is not one of my local names (DOMAIN_MEMBER)\n",
 337                                         user_info->mapped.domain_name));
 338                                 return NT_STATUS_NOT_IMPLEMENTED;
 339                         }
 340                         return NT_STATUS_OK;
 341
 342                 case ROLE_DOMAIN_CONTROLLER:
 343                         if (!is_local_name && !is_my_domain) {
 344                                 DEBUG(6,("authsam_check_password: %s is not one of my local names or domain name (DC)\n",
 345                                         user_info->mapped.domain_name));
 346                                 return NT_STATUS_NOT_IMPLEMENTED;
 347                         }
 348                         return NT_STATUS_OK;
 349         }
 350
 351         DEBUG(6,("authsam_check_password: lpcfg_server_role() has an undefined value\n"));
 352         return NT_STATUS_NOT_IMPLEMENTED;
 353 }
 354
 355
 356 /* Wrapper for the auth subsystem pointer */
 357 static NTSTATUS authsam_get_user_info_dc_principal_wrapper(TALLOC_CTX *mem_ctx,
 358                                                           struct auth_context *auth_context,
 359                                                           const char *principal,
 360                                                           struct ldb_dn *user_dn,
 361                                                           struct auth_user_info_dc **user_info_dc)
 362 {
 363         return authsam_get_user_info_dc_principal(mem_ctx, auth_context->lp_ctx, auth_context->sam_ctx,
 364                                                  principal, user_dn, user_info_dc);
 365 }
 366 static const struct auth_operations sam_ignoredomain_ops = {
 367         .name                      = "sam_ignoredomain",
 368         .get_challenge             = auth_get_challenge_not_implemented,
 369         .want_check                = authsam_ignoredomain_want_check,
 370         .check_password            = authsam_check_password_internals,
 371         .get_user_info_dc_principal = authsam_get_user_info_dc_principal_wrapper
 372 };
 373
 374 static const struct auth_operations sam_ops = {
 375         .name                      = "sam",
 376         .get_challenge             = auth_get_challenge_not_implemented,
 377         .want_check                = authsam_want_check,
 378         .check_password            = authsam_check_password_internals,
 379         .get_user_info_dc_principal = authsam_get_user_info_dc_principal_wrapper
 380 };
 381
 382 _PUBLIC_ NTSTATUS auth_sam_init(void)
 383 {
 384         NTSTATUS ret;
 385
 386         ret = auth_register(&sam_ops);
 387         if (!NT_STATUS_IS_OK(ret)) {
 388                 DEBUG(0,("Failed to register 'sam' auth backend!\n"));
 389                 return ret;
 390         }
 391
 392         ret = auth_register(&sam_ignoredomain_ops);
 393         if (!NT_STATUS_IS_OK(ret)) {
 394                 DEBUG(0,("Failed to register 'sam_ignoredomain' auth backend!\n"));
 395                 return ret;
 396         }
 397
 398         return ret;
 399 }