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 NTSTATUS auth_sam_init(void);
  38
  39 extern const char *user_attrs[];
  40 extern const char *domain_ref_attrs[];
  41
  42 /****************************************************************************
  43  Look for the specified user in the sam, return ldb result structures
  44 ****************************************************************************/
  45
  46 static NTSTATUS authsam_search_account(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
  47                                        const char *account_name,
  48                                        struct ldb_dn *domain_dn,
  49                                        struct ldb_message **ret_msg)
  50 {
  51         int ret;
  52
  53         /* pull the user attributes */
  54         ret = dsdb_search_one(sam_ctx, mem_ctx, ret_msg, domain_dn, LDB_SCOPE_SUBTREE,
  55                               user_attrs,
  56                               DSDB_SEARCH_SHOW_EXTENDED_DN,
  57                               "(&(sAMAccountName=%s)(objectclass=user))",
  58                               ldb_binary_encode_string(mem_ctx, account_name));
  59         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
  60                 DEBUG(3,("sam_search_user: Couldn't find user [%s] in samdb, under %s\n",
  61                          account_name, ldb_dn_get_linearized(domain_dn)));
  62                 return NT_STATUS_NO_SUCH_USER;
  63         }
  64         if (ret != LDB_SUCCESS) {
  65                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  66         }
  67
  68         return NT_STATUS_OK;
  69 }
  70
  71 /****************************************************************************
  72  Do a specific test for an smb password being correct, given a smb_password and
  73  the lanman and NT responses.
  74 ****************************************************************************/
  75 static NTSTATUS authsam_password_ok(struct auth4_context *auth_context,
  76                                     TALLOC_CTX *mem_ctx,
  77                                     uint16_t acct_flags,
  78                                     const struct samr_Password *lm_pwd,
  79                                     const struct samr_Password *nt_pwd,
  80                                     const struct auth_usersupplied_info *user_info,
  81                                     DATA_BLOB *user_sess_key,
  82                                     DATA_BLOB *lm_sess_key)
  83 {
  84         NTSTATUS status;
  85
  86         switch (user_info->password_state) {
  87         case AUTH_PASSWORD_PLAIN:
  88         {
  89                 const struct auth_usersupplied_info *user_info_temp;
  90                 status = encrypt_user_info(mem_ctx, auth_context,
  91                                            AUTH_PASSWORD_HASH,
  92                                            user_info, &user_info_temp);
  93                 if (!NT_STATUS_IS_OK(status)) {
  94                         DEBUG(1, ("Failed to convert plaintext password to password HASH: %s\n", nt_errstr(status)));
  95                         return status;
  96                 }
  97                 user_info = user_info_temp;
  98
  99                 /*fall through*/
 100         }
 101         case AUTH_PASSWORD_HASH:
 102                 *lm_sess_key = data_blob(NULL, 0);
 103                 *user_sess_key = data_blob(NULL, 0);
 104                 status = hash_password_check(mem_ctx,
 105                                              lpcfg_lanman_auth(auth_context->lp_ctx),
 106                                              user_info->password.hash.lanman,
 107                                              user_info->password.hash.nt,
 108                                              user_info->mapped.account_name,
 109                                              lm_pwd, nt_pwd);
 110                 NT_STATUS_NOT_OK_RETURN(status);
 111                 break;
 112
 113         case AUTH_PASSWORD_RESPONSE:
 114                 status = ntlm_password_check(mem_ctx,
 115                                              lpcfg_lanman_auth(auth_context->lp_ctx),
 116                                                  lpcfg_ntlm_auth(auth_context->lp_ctx),
 117                                              user_info->logon_parameters,
 118                                              &auth_context->challenge.data,
 119                                              &user_info->password.response.lanman,
 120                                              &user_info->password.response.nt,
 121                                              user_info->mapped.account_name,
 122                                              user_info->client.account_name,
 123                                              user_info->client.domain_name,
 124                                              lm_pwd, nt_pwd,
 125                                              user_sess_key, lm_sess_key);
 126                 NT_STATUS_NOT_OK_RETURN(status);
 127                 break;
 128         }
 129
 130         if (user_sess_key && user_sess_key->data) {
 131                 talloc_steal(auth_context, user_sess_key->data);
 132         }
 133         if (lm_sess_key && lm_sess_key->data) {
 134                 talloc_steal(auth_context, lm_sess_key->data);
 135         }
 136
 137         return NT_STATUS_OK;
 138 }
 139
 140
 141 /*
 142   send a message to the drepl server telling it to initiate a
 143   REPL_SECRET getncchanges extended op to fetch the users secrets
 144  */
 145 static void auth_sam_trigger_repl_secret(TALLOC_CTX *mem_ctx, struct auth4_context *auth_context,
 146                                          struct ldb_dn *user_dn)
 147 {
 148         struct dcerpc_binding_handle *irpc_handle;
 149         struct drepl_trigger_repl_secret r;
 150         struct tevent_req *req;
 151
 152         irpc_handle = irpc_binding_handle_by_name(mem_ctx, auth_context->msg_ctx,
 153                                                   "dreplsrv",
 154                                                   &ndr_table_irpc);
 155         if (irpc_handle == NULL) {
 156                 DEBUG(1,(__location__ ": Unable to get binding handle for dreplsrv\n"));
 157                 return;
 158         }
 159
 160         r.in.user_dn = ldb_dn_get_linearized(user_dn);
 161
 162         req = dcerpc_drepl_trigger_repl_secret_r_send(mem_ctx,
 163                                                       auth_context->event_ctx,
 164                                                       irpc_handle,
 165                                                       &r);
 166
 167         /* we aren't interested in a reply */
 168         talloc_free(req);
 169         talloc_free(irpc_handle);
 170 }
 171
 172
 173 static NTSTATUS authsam_authenticate(struct auth4_context *auth_context,
 174                                      TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 175                                      struct ldb_dn *domain_dn,
 176                                      struct ldb_message *msg,
 177                                      const struct auth_usersupplied_info *user_info,
 178                                      DATA_BLOB *user_sess_key, DATA_BLOB *lm_sess_key)
 179 {
 180         struct samr_Password *lm_pwd, *nt_pwd;
 181         NTSTATUS nt_status;
 182
 183         uint16_t acct_flags = samdb_result_acct_flags(auth_context->sam_ctx, mem_ctx, msg, domain_dn);
 184
 185         /* Quit if the account was locked out. */
 186         if (acct_flags & ACB_AUTOLOCK) {
 187                 DEBUG(3,("check_sam_security: Account for user %s was locked out.\n",
 188                          user_info->mapped.account_name));
 189                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 190         }
 191
 192         /* You can only do an interactive login to normal accounts */
 193         if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
 194                 if (!(acct_flags & ACB_NORMAL)) {
 195                         return NT_STATUS_NO_SUCH_USER;
 196                 }
 197         }
 198
 199         nt_status = samdb_result_passwords(mem_ctx, auth_context->lp_ctx, msg, &lm_pwd, &nt_pwd);
 200         NT_STATUS_NOT_OK_RETURN(nt_status);
 201
 202         if (lm_pwd == NULL && nt_pwd == NULL) {
 203                 bool am_rodc;
 204                 if (samdb_rodc(auth_context->sam_ctx, &am_rodc) == LDB_SUCCESS && am_rodc) {
 205                         /* we don't have passwords for this
 206                          * account. We are an RODC, and this account
 207                          * may be one for which we either are denied
 208                          * REPL_SECRET replication or we haven't yet
 209                          * done the replication. We return
 210                          * NT_STATUS_NOT_IMPLEMENTED which tells the
 211                          * auth code to try the next authentication
 212                          * mechanism. We also send a message to our
 213                          * drepl server to tell it to try and
 214                          * replicate the secrets for this account.
 215                          */
 216                         auth_sam_trigger_repl_secret(mem_ctx, auth_context, msg->dn);
 217                         return NT_STATUS_NOT_IMPLEMENTED;
 218                 }
 219         }
 220
 221         nt_status = authsam_password_ok(auth_context, mem_ctx,
 222                                         acct_flags, lm_pwd, nt_pwd,
 223                                         user_info, user_sess_key, lm_sess_key);
 224         NT_STATUS_NOT_OK_RETURN(nt_status);
 225
 226         nt_status = authsam_account_ok(mem_ctx, auth_context->sam_ctx,
 227                                        user_info->logon_parameters,
 228                                        domain_dn,
 229                                        msg,
 230                                        user_info->workstation_name,
 231                                        user_info->mapped.account_name,
 232                                        false, false);
 233
 234         return nt_status;
 235 }
 236
 237
 238
 239 static NTSTATUS authsam_check_password_internals(struct auth_method_context *ctx,
 240                                                  TALLOC_CTX *mem_ctx,
 241                                                  const struct auth_usersupplied_info *user_info,
 242                                                  struct auth_user_info_dc **user_info_dc)
 243 {
 244         NTSTATUS nt_status;
 245         const char *account_name = user_info->mapped.account_name;
 246         struct ldb_message *msg;
 247         struct ldb_dn *domain_dn;
 248         DATA_BLOB user_sess_key, lm_sess_key;
 249         TALLOC_CTX *tmp_ctx;
 250
 251         if (ctx->auth_ctx->sam_ctx == NULL) {
 252                 DEBUG(0, ("No SAM available, cannot log in users\n"));
 253                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 254         }
 255
 256         if (!account_name || !*account_name) {
 257                 /* 'not for me' */
 258                 return NT_STATUS_NOT_IMPLEMENTED;
 259         }
 260
 261         tmp_ctx = talloc_new(mem_ctx);
 262         if (!tmp_ctx) {
 263                 return NT_STATUS_NO_MEMORY;
 264         }
 265
 266         domain_dn = ldb_get_default_basedn(ctx->auth_ctx->sam_ctx);
 267         if (domain_dn == NULL) {
 268                 talloc_free(tmp_ctx);
 269                 return NT_STATUS_NO_SUCH_DOMAIN;
 270         }
 271
 272         nt_status = authsam_search_account(tmp_ctx, ctx->auth_ctx->sam_ctx, account_name, domain_dn, &msg);
 273         if (!NT_STATUS_IS_OK(nt_status)) {
 274                 talloc_free(tmp_ctx);
 275                 return nt_status;
 276         }
 277
 278         nt_status = authsam_authenticate(ctx->auth_ctx, tmp_ctx, ctx->auth_ctx->sam_ctx, domain_dn, msg, user_info,
 279                                          &user_sess_key, &lm_sess_key);
 280         if (!NT_STATUS_IS_OK(nt_status)) {
 281                 talloc_free(tmp_ctx);
 282                 return nt_status;
 283         }
 284
 285         nt_status = authsam_make_user_info_dc(tmp_ctx, ctx->auth_ctx->sam_ctx, lpcfg_netbios_name(ctx->auth_ctx->lp_ctx),
 286                                              lpcfg_sam_name(ctx->auth_ctx->lp_ctx),
 287                                              domain_dn,
 288                                              msg,
 289                                              user_sess_key, lm_sess_key,
 290                                              user_info_dc);
 291         if (!NT_STATUS_IS_OK(nt_status)) {
 292                 talloc_free(tmp_ctx);
 293                 return nt_status;
 294         }
 295
 296         talloc_steal(mem_ctx, *user_info_dc);
 297         talloc_free(tmp_ctx);
 298
 299         return NT_STATUS_OK;
 300 }
 301
 302 static NTSTATUS authsam_ignoredomain_want_check(struct auth_method_context *ctx,
 303                                                 TALLOC_CTX *mem_ctx,
 304                                                 const struct auth_usersupplied_info *user_info)
 305 {
 306         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 307                 return NT_STATUS_NOT_IMPLEMENTED;
 308         }
 309
 310         return NT_STATUS_OK;
 311 }
 312
 313 /****************************************************************************
 314 Check SAM security (above) but with a few extra checks.
 315 ****************************************************************************/
 316 static NTSTATUS authsam_want_check(struct auth_method_context *ctx,
 317                                    TALLOC_CTX *mem_ctx,
 318                                    const struct auth_usersupplied_info *user_info)
 319 {
 320         bool is_local_name, is_my_domain;
 321
 322         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 323                 return NT_STATUS_NOT_IMPLEMENTED;
 324         }
 325
 326         is_local_name = lpcfg_is_myname(ctx->auth_ctx->lp_ctx,
 327                                   user_info->mapped.domain_name);
 328         is_my_domain  = lpcfg_is_mydomain(ctx->auth_ctx->lp_ctx,
 329                                        user_info->mapped.domain_name);
 330
 331         /* check whether or not we service this domain/workgroup name */
 332         switch (lpcfg_server_role(ctx->auth_ctx->lp_ctx)) {
 333                 case ROLE_STANDALONE:
 334                         return NT_STATUS_OK;
 335
 336                 case ROLE_DOMAIN_MEMBER:
 337                         if (!is_local_name) {
 338                                 DEBUG(6,("authsam_check_password: %s is not one of my local names (DOMAIN_MEMBER)\n",
 339                                         user_info->mapped.domain_name));
 340                                 return NT_STATUS_NOT_IMPLEMENTED;
 341                         }
 342                         return NT_STATUS_OK;
 343
 344                 case ROLE_ACTIVE_DIRECTORY_DC:
 345                         if (!is_local_name && !is_my_domain) {
 346                                 DEBUG(6,("authsam_check_password: %s is not one of my local names or domain name (DC)\n",
 347                                         user_info->mapped.domain_name));
 348                                 return NT_STATUS_NOT_IMPLEMENTED;
 349                         }
 350                         return NT_STATUS_OK;
 351         }
 352
 353         DEBUG(6,("authsam_check_password: lpcfg_server_role() has an undefined value\n"));
 354         return NT_STATUS_NOT_IMPLEMENTED;
 355 }
 356
 357
 358 /* Wrapper for the auth subsystem pointer */
 359 static NTSTATUS authsam_get_user_info_dc_principal_wrapper(TALLOC_CTX *mem_ctx,
 360                                                           struct auth4_context *auth_context,
 361                                                           const char *principal,
 362                                                           struct ldb_dn *user_dn,
 363                                                           struct auth_user_info_dc **user_info_dc)
 364 {
 365         return authsam_get_user_info_dc_principal(mem_ctx, auth_context->lp_ctx, auth_context->sam_ctx,
 366                                                  principal, user_dn, user_info_dc);
 367 }
 368 static const struct auth_operations sam_ignoredomain_ops = {
 369         .name                      = "sam_ignoredomain",
 370         .want_check                = authsam_ignoredomain_want_check,
 371         .check_password            = authsam_check_password_internals,
 372         .get_user_info_dc_principal = authsam_get_user_info_dc_principal_wrapper
 373 };
 374
 375 static const struct auth_operations sam_ops = {
 376         .name                      = "sam",
 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 auth4_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 }