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         return NT_STATUS_OK;
 131 }
 132
 133
 134 /*
 135   send a message to the drepl server telling it to initiate a
 136   REPL_SECRET getncchanges extended op to fetch the users secrets
 137  */
 138 static void auth_sam_trigger_repl_secret(struct auth4_context *auth_context,
 139                                          struct ldb_dn *user_dn)
 140 {
 141         struct dcerpc_binding_handle *irpc_handle;
 142         struct drepl_trigger_repl_secret r;
 143         struct tevent_req *req;
 144         TALLOC_CTX *tmp_ctx;
 145
 146         tmp_ctx = talloc_new(auth_context);
 147         if (tmp_ctx == NULL) {
 148                 return;
 149         }
 150
 151         irpc_handle = irpc_binding_handle_by_name(tmp_ctx, auth_context->msg_ctx,
 152                                                   "dreplsrv",
 153                                                   &ndr_table_irpc);
 154         if (irpc_handle == NULL) {
 155                 DEBUG(1,(__location__ ": Unable to get binding handle for dreplsrv\n"));
 156                 TALLOC_FREE(tmp_ctx);
 157                 return;
 158         }
 159
 160         r.in.user_dn = ldb_dn_get_linearized(user_dn);
 161
 162         /*
 163          * This seem to rely on the current IRPC implementation,
 164          * which delivers the message in the _send function.
 165          *
 166          * TODO: we need a ONE_WAY IRPC handle and register
 167          * a callback and wait for it to be triggered!
 168          */
 169         req = dcerpc_drepl_trigger_repl_secret_r_send(tmp_ctx,
 170                                                       auth_context->event_ctx,
 171                                                       irpc_handle,
 172                                                       &r);
 173
 174         /* we aren't interested in a reply */
 175         talloc_free(req);
 176         TALLOC_FREE(tmp_ctx);
 177 }
 178
 179
 180 static NTSTATUS authsam_authenticate(struct auth4_context *auth_context,
 181                                      TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 182                                      struct ldb_dn *domain_dn,
 183                                      struct ldb_message *msg,
 184                                      const struct auth_usersupplied_info *user_info,
 185                                      DATA_BLOB *user_sess_key, DATA_BLOB *lm_sess_key)
 186 {
 187         struct samr_Password *lm_pwd, *nt_pwd;
 188         NTSTATUS nt_status;
 189         TALLOC_CTX *tmp_ctx;
 190         uint16_t acct_flags = samdb_result_acct_flags(msg, NULL);
 191
 192         tmp_ctx = talloc_new(mem_ctx);
 193         if (tmp_ctx == NULL) {
 194                 return NT_STATUS_NO_MEMORY;
 195         }
 196
 197         /* You can only do an interactive login to normal accounts */
 198         if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
 199                 if (!(acct_flags & ACB_NORMAL)) {
 200                         TALLOC_FREE(tmp_ctx);
 201                         return NT_STATUS_NO_SUCH_USER;
 202                 }
 203         }
 204
 205         nt_status = samdb_result_passwords(tmp_ctx, auth_context->lp_ctx, msg, &lm_pwd, &nt_pwd);
 206         if (!NT_STATUS_IS_OK(nt_status)) {
 207                 TALLOC_FREE(tmp_ctx);
 208                 return nt_status;
 209         }
 210
 211         if (lm_pwd == NULL && nt_pwd == NULL) {
 212                 bool am_rodc;
 213                 if (samdb_rodc(auth_context->sam_ctx, &am_rodc) == LDB_SUCCESS && am_rodc) {
 214                         /* we don't have passwords for this
 215                          * account. We are an RODC, and this account
 216                          * may be one for which we either are denied
 217                          * REPL_SECRET replication or we haven't yet
 218                          * done the replication. We return
 219                          * NT_STATUS_NOT_IMPLEMENTED which tells the
 220                          * auth code to try the next authentication
 221                          * mechanism. We also send a message to our
 222                          * drepl server to tell it to try and
 223                          * replicate the secrets for this account.
 224                          */
 225                         auth_sam_trigger_repl_secret(auth_context, msg->dn);
 226                         TALLOC_FREE(tmp_ctx);
 227                         return NT_STATUS_NOT_IMPLEMENTED;
 228                 }
 229         }
 230
 231         nt_status = authsam_password_ok(auth_context, tmp_ctx,
 232                                         acct_flags, lm_pwd, nt_pwd,
 233                                         user_info, user_sess_key, lm_sess_key);
 234         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_WRONG_PASSWORD)) {
 235                 NTSTATUS update_bad_pwd_count_status = authsam_update_bad_pwd_count(auth_context->sam_ctx, msg, domain_dn);
 236                 if (!NT_STATUS_IS_OK(update_bad_pwd_count_status)) {
 237                         /* bo! (what can we do here? */
 238                 }
 239         }
 240
 241         if (!NT_STATUS_IS_OK(nt_status)) {
 242                 TALLOC_FREE(tmp_ctx);
 243                 return nt_status;
 244         }
 245
 246         nt_status = authsam_account_ok(tmp_ctx, auth_context->sam_ctx,
 247                                        user_info->logon_parameters,
 248                                        domain_dn,
 249                                        msg,
 250                                        user_info->workstation_name,
 251                                        user_info->mapped.account_name,
 252                                        false, false);
 253
 254         if (!NT_STATUS_IS_OK(nt_status)) {
 255                 TALLOC_FREE(tmp_ctx);
 256                 return nt_status;
 257         }
 258
 259         if (user_sess_key && user_sess_key->data) {
 260                 talloc_steal(mem_ctx, user_sess_key->data);
 261         }
 262         if (lm_sess_key && lm_sess_key->data) {
 263                 talloc_steal(mem_ctx, lm_sess_key->data);
 264         }
 265
 266         TALLOC_FREE(tmp_ctx);
 267         return nt_status;
 268 }
 269
 270
 271
 272 static NTSTATUS authsam_check_password_internals(struct auth_method_context *ctx,
 273                                                  TALLOC_CTX *mem_ctx,
 274                                                  const struct auth_usersupplied_info *user_info,
 275                                                  struct auth_user_info_dc **user_info_dc)
 276 {
 277         NTSTATUS nt_status;
 278         const char *account_name = user_info->mapped.account_name;
 279         struct ldb_message *msg;
 280         struct ldb_dn *domain_dn;
 281         DATA_BLOB user_sess_key, lm_sess_key;
 282         TALLOC_CTX *tmp_ctx;
 283
 284         if (ctx->auth_ctx->sam_ctx == NULL) {
 285                 DEBUG(0, ("No SAM available, cannot log in users\n"));
 286                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 287         }
 288
 289         if (!account_name || !*account_name) {
 290                 /* 'not for me' */
 291                 return NT_STATUS_NOT_IMPLEMENTED;
 292         }
 293
 294         tmp_ctx = talloc_new(mem_ctx);
 295         if (!tmp_ctx) {
 296                 return NT_STATUS_NO_MEMORY;
 297         }
 298
 299         domain_dn = ldb_get_default_basedn(ctx->auth_ctx->sam_ctx);
 300         if (domain_dn == NULL) {
 301                 talloc_free(tmp_ctx);
 302                 return NT_STATUS_NO_SUCH_DOMAIN;
 303         }
 304
 305         nt_status = authsam_search_account(tmp_ctx, ctx->auth_ctx->sam_ctx, account_name, domain_dn, &msg);
 306         if (!NT_STATUS_IS_OK(nt_status)) {
 307                 talloc_free(tmp_ctx);
 308                 return nt_status;
 309         }
 310
 311         nt_status = authsam_authenticate(ctx->auth_ctx, tmp_ctx, ctx->auth_ctx->sam_ctx, domain_dn, msg, user_info,
 312                                          &user_sess_key, &lm_sess_key);
 313         if (!NT_STATUS_IS_OK(nt_status)) {
 314                 talloc_free(tmp_ctx);
 315                 return nt_status;
 316         }
 317
 318         nt_status = authsam_make_user_info_dc(tmp_ctx, ctx->auth_ctx->sam_ctx, lpcfg_netbios_name(ctx->auth_ctx->lp_ctx),
 319                                              lpcfg_sam_name(ctx->auth_ctx->lp_ctx),
 320                                              domain_dn,
 321                                              msg,
 322                                              user_sess_key, lm_sess_key,
 323                                              user_info_dc);
 324         if (!NT_STATUS_IS_OK(nt_status)) {
 325                 talloc_free(tmp_ctx);
 326                 return nt_status;
 327         }
 328
 329         talloc_steal(mem_ctx, *user_info_dc);
 330         talloc_free(tmp_ctx);
 331
 332         return NT_STATUS_OK;
 333 }
 334
 335 static NTSTATUS authsam_ignoredomain_want_check(struct auth_method_context *ctx,
 336                                                 TALLOC_CTX *mem_ctx,
 337                                                 const struct auth_usersupplied_info *user_info)
 338 {
 339         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 340                 return NT_STATUS_NOT_IMPLEMENTED;
 341         }
 342
 343         return NT_STATUS_OK;
 344 }
 345
 346 /****************************************************************************
 347 Check SAM security (above) but with a few extra checks.
 348 ****************************************************************************/
 349 static NTSTATUS authsam_want_check(struct auth_method_context *ctx,
 350                                    TALLOC_CTX *mem_ctx,
 351                                    const struct auth_usersupplied_info *user_info)
 352 {
 353         bool is_local_name, is_my_domain;
 354
 355         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 356                 return NT_STATUS_NOT_IMPLEMENTED;
 357         }
 358
 359         is_local_name = lpcfg_is_myname(ctx->auth_ctx->lp_ctx,
 360                                   user_info->mapped.domain_name);
 361         is_my_domain  = lpcfg_is_mydomain(ctx->auth_ctx->lp_ctx,
 362                                        user_info->mapped.domain_name);
 363
 364         /* check whether or not we service this domain/workgroup name */
 365         switch (lpcfg_server_role(ctx->auth_ctx->lp_ctx)) {
 366                 case ROLE_STANDALONE:
 367                         return NT_STATUS_OK;
 368
 369                 case ROLE_DOMAIN_MEMBER:
 370                         if (!is_local_name) {
 371                                 DEBUG(6,("authsam_check_password: %s is not one of my local names (DOMAIN_MEMBER)\n",
 372                                         user_info->mapped.domain_name));
 373                                 return NT_STATUS_NOT_IMPLEMENTED;
 374                         }
 375                         return NT_STATUS_OK;
 376
 377                 case ROLE_ACTIVE_DIRECTORY_DC:
 378                         if (!is_local_name && !is_my_domain) {
 379                                 DEBUG(6,("authsam_check_password: %s is not one of my local names or domain name (DC)\n",
 380                                         user_info->mapped.domain_name));
 381                                 return NT_STATUS_NOT_IMPLEMENTED;
 382                         }
 383                         return NT_STATUS_OK;
 384         }
 385
 386         DEBUG(6,("authsam_check_password: lpcfg_server_role() has an undefined value\n"));
 387         return NT_STATUS_NOT_IMPLEMENTED;
 388 }
 389
 390
 391 /* Wrapper for the auth subsystem pointer */
 392 static NTSTATUS authsam_get_user_info_dc_principal_wrapper(TALLOC_CTX *mem_ctx,
 393                                                           struct auth4_context *auth_context,
 394                                                           const char *principal,
 395                                                           struct ldb_dn *user_dn,
 396                                                           struct auth_user_info_dc **user_info_dc)
 397 {
 398         return authsam_get_user_info_dc_principal(mem_ctx, auth_context->lp_ctx, auth_context->sam_ctx,
 399                                                  principal, user_dn, user_info_dc);
 400 }
 401 static const struct auth_operations sam_ignoredomain_ops = {
 402         .name                      = "sam_ignoredomain",
 403         .want_check                = authsam_ignoredomain_want_check,
 404         .check_password            = authsam_check_password_internals,
 405         .get_user_info_dc_principal = authsam_get_user_info_dc_principal_wrapper
 406 };
 407
 408 static const struct auth_operations sam_ops = {
 409         .name                      = "sam",
 410         .want_check                = authsam_want_check,
 411         .check_password            = authsam_check_password_internals,
 412         .get_user_info_dc_principal = authsam_get_user_info_dc_principal_wrapper
 413 };
 414
 415 _PUBLIC_ NTSTATUS auth4_sam_init(void);
 416 _PUBLIC_ NTSTATUS auth4_sam_init(void)
 417 {
 418         NTSTATUS ret;
 419
 420         ret = auth_register(&sam_ops);
 421         if (!NT_STATUS_IS_OK(ret)) {
 422                 DEBUG(0,("Failed to register 'sam' auth backend!\n"));
 423                 return ret;
 424         }
 425
 426         ret = auth_register(&sam_ignoredomain_ops);
 427         if (!NT_STATUS_IS_OK(ret)) {
 428                 DEBUG(0,("Failed to register 'sam_ignoredomain' auth backend!\n"));
 429                 return ret;
 430         }
 431
 432         return ret;
 433 }