source3/auth/auth_domain.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Authenticate against a remote domain
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Andrew Bartlett 2001
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "auth.h"
  23 #include "../libcli/auth/libcli_auth.h"
  24 #include "../librpc/gen_ndr/ndr_netlogon.h"
  25 #include "rpc_client/cli_pipe.h"
  26 #include "rpc_client/cli_netlogon.h"
  27 #include "secrets.h"
  28 #include "passdb.h"
  29 #include "libsmb/libsmb.h"
  30 #include "libcli/auth/netlogon_creds_cli.h"
  31
  32 #undef DBGC_CLASS
  33 #define DBGC_CLASS DBGC_AUTH
  34
  35 static struct named_mutex *mutex;
  36
  37 /**
  38  * Connect to a remote server for (inter)domain security authenticaion.
  39  *
  40  * @param cli the cli to return containing the active connection
  41  * @param server either a machine name or text IP address to
  42  *               connect to.
  43  * @param setup_creds_as domain account to setup credentials as
  44  * @param sec_chan a switch value to distinguish between domain
  45  *                 member and interdomain authentication
  46  * @param trust_passwd the trust password to establish the
  47  *                     credentials with.
  48  *
  49  **/
  50
  51 static NTSTATUS connect_to_domain_password_server(struct cli_state **cli_ret,
  52                                                 const char *domain,
  53                                                 const char *dc_name,
  54                                                 const struct sockaddr_storage *dc_ss,
  55                                                 struct rpc_pipe_client **pipe_ret,
  56                                                 struct netlogon_creds_cli_context **creds_ret)
  57 {
  58         TALLOC_CTX *frame = talloc_stackframe();
  59         struct messaging_context *msg_ctx = server_messaging_context();
  60         NTSTATUS result;
  61         struct cli_state *cli = NULL;
  62         struct rpc_pipe_client *netlogon_pipe = NULL;
  63         struct netlogon_creds_cli_context *netlogon_creds = NULL;
  64         struct netlogon_creds_CredentialState *creds = NULL;
  65         uint32_t netlogon_flags = 0;
  66         enum netr_SchannelType sec_chan_type = 0;
  67         const char *_account_name = NULL;
  68         const char *account_name = NULL;
  69         struct samr_Password current_nt_hash;
  70         struct samr_Password *previous_nt_hash = NULL;
  71         bool ok;
  72
  73         *cli_ret = NULL;
  74
  75         *pipe_ret = NULL;
  76         *creds_ret = NULL;
  77
  78         /* TODO: Send a SAMLOGON request to determine whether this is a valid
  79            logonserver.  We can avoid a 30-second timeout if the DC is down
  80            if the SAMLOGON request fails as it is only over UDP. */
  81
  82         /* we use a mutex to prevent two connections at once - when a
  83            Win2k PDC get two connections where one hasn't completed a
  84            session setup yet it will send a TCP reset to the first
  85            connection (tridge) */
  86
  87         /*
  88          * With NT4.x DC's *all* authentication must be serialized to avoid
  89          * ACCESS_DENIED errors if 2 auths are done from the same machine. JRA.
  90          */
  91
  92         mutex = grab_named_mutex(NULL, dc_name, 10);
  93         if (mutex == NULL) {
  94                 TALLOC_FREE(frame);
  95                 return NT_STATUS_NO_LOGON_SERVERS;
  96         }
  97
  98         /* Attempt connection */
  99         result = cli_full_connection(&cli, lp_netbios_name(), dc_name, dc_ss, 0,
 100                 "IPC$", "IPC", "", "", "", 0, SMB_SIGNING_DEFAULT);
 101
 102         if (!NT_STATUS_IS_OK(result)) {
 103                 /* map to something more useful */
 104                 if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
 105                         result = NT_STATUS_NO_LOGON_SERVERS;
 106                 }
 107
 108                 TALLOC_FREE(mutex);
 109                 TALLOC_FREE(frame);
 110                 return result;
 111         }
 112
 113         /*
 114          * We now have an anonymous connection to IPC$ on the domain password server.
 115          */
 116
 117         ok = get_trust_pw_hash(domain,
 118                                current_nt_hash.hash,
 119                                &_account_name,
 120                                &sec_chan_type);
 121         if (!ok) {
 122                 cli_shutdown(cli);
 123                 TALLOC_FREE(mutex);
 124                 TALLOC_FREE(frame);
 125                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 126         }
 127
 128         account_name = talloc_asprintf(talloc_tos(), "%s$", _account_name);
 129         if (account_name == NULL) {
 130                 cli_shutdown(cli);
 131                 TALLOC_FREE(mutex);
 132                 TALLOC_FREE(frame);
 133                 return NT_STATUS_NO_MEMORY;
 134         }
 135
 136         result = rpccli_create_netlogon_creds(dc_name,
 137                                               domain,
 138                                               account_name,
 139                                               sec_chan_type,
 140                                               msg_ctx,
 141                                               talloc_tos(),
 142                                               &netlogon_creds);
 143         if (!NT_STATUS_IS_OK(result)) {
 144                 cli_shutdown(cli);
 145                 TALLOC_FREE(mutex);
 146                 TALLOC_FREE(frame);
 147                 SAFE_FREE(previous_nt_hash);
 148                 return result;
 149         }
 150
 151         result = rpccli_setup_netlogon_creds(cli,
 152                                              netlogon_creds,
 153                                              false, /* force_reauth */
 154                                              current_nt_hash,
 155                                              previous_nt_hash);
 156         SAFE_FREE(previous_nt_hash);
 157         if (!NT_STATUS_IS_OK(result)) {
 158                 cli_shutdown(cli);
 159                 TALLOC_FREE(mutex);
 160                 TALLOC_FREE(frame);
 161                 return result;
 162         }
 163
 164         result = netlogon_creds_cli_get(netlogon_creds,
 165                                         talloc_tos(),
 166                                         &creds);
 167         if (!NT_STATUS_IS_OK(result)) {
 168                 cli_shutdown(cli);
 169                 TALLOC_FREE(mutex);
 170                 TALLOC_FREE(frame);
 171                 return result;
 172         }
 173         netlogon_flags = creds->negotiate_flags;
 174         TALLOC_FREE(creds);
 175
 176         if (netlogon_flags & NETLOGON_NEG_AUTHENTICATED_RPC) {
 177                 result = cli_rpc_pipe_open_schannel_with_key(
 178                         cli, &ndr_table_netlogon, NCACN_NP,
 179                         domain, netlogon_creds, &netlogon_pipe);
 180         } else {
 181                 result = cli_rpc_pipe_open_noauth(cli,
 182                                         &ndr_table_netlogon,
 183                                         &netlogon_pipe);
 184         }
 185
 186         if (!NT_STATUS_IS_OK(result)) {
 187                 DEBUG(0,("connect_to_domain_password_server: "
 188                          "unable to open the domain client session to "
 189                          "machine %s. Flags[0x%08X] Error was : %s.\n",
 190                          dc_name, (unsigned)netlogon_flags,
 191                          nt_errstr(result)));
 192                 cli_shutdown(cli);
 193                 TALLOC_FREE(mutex);
 194                 TALLOC_FREE(frame);
 195                 return result;
 196         }
 197
 198         if(!netlogon_pipe) {
 199                 DEBUG(0, ("connect_to_domain_password_server: unable to open "
 200                           "the domain client session to machine %s. Error "
 201                           "was : %s.\n", dc_name, nt_errstr(result)));
 202                 cli_shutdown(cli);
 203                 TALLOC_FREE(mutex);
 204                 TALLOC_FREE(frame);
 205                 return NT_STATUS_NO_LOGON_SERVERS;
 206         }
 207
 208         /* We exit here with the mutex *locked*. JRA */
 209
 210         *cli_ret = cli;
 211         *pipe_ret = netlogon_pipe;
 212         *creds_ret = netlogon_creds;
 213
 214         TALLOC_FREE(frame);
 215         return NT_STATUS_OK;
 216 }
 217
 218 /***********************************************************************
 219  Do the same as security=server, but using NT Domain calls and a session
 220  key from the machine password.  If the server parameter is specified
 221  use it, otherwise figure out a server from the 'password server' param.
 222 ************************************************************************/
 223
 224 static NTSTATUS domain_client_validate(TALLOC_CTX *mem_ctx,
 225                                         const struct auth_usersupplied_info *user_info,
 226                                         const char *domain,
 227                                         uchar chal[8],
 228                                         struct auth_serversupplied_info **server_info,
 229                                         const char *dc_name,
 230                                         const struct sockaddr_storage *dc_ss)
 231
 232 {
 233         struct netr_SamInfo3 *info3 = NULL;
 234         struct cli_state *cli = NULL;
 235         struct rpc_pipe_client *netlogon_pipe = NULL;
 236         struct netlogon_creds_cli_context *netlogon_creds = NULL;
 237         NTSTATUS nt_status = NT_STATUS_NO_LOGON_SERVERS;
 238         int i;
 239         uint8_t authoritative = 0;
 240         uint32_t flags = 0;
 241
 242         /*
 243          * At this point, smb_apasswd points to the lanman response to
 244          * the challenge in local_challenge, and smb_ntpasswd points to
 245          * the NT response to the challenge in local_challenge. Ship
 246          * these over the secure channel to a domain controller and
 247          * see if they were valid.
 248          */
 249
 250         /* rety loop for robustness */
 251
 252         for (i = 0; !NT_STATUS_IS_OK(nt_status) && (i < 3); i++) {
 253                 nt_status = connect_to_domain_password_server(&cli,
 254                                                         domain,
 255                                                         dc_name,
 256                                                         dc_ss,
 257                                                         &netlogon_pipe,
 258                                                         &netlogon_creds);
 259         }
 260
 261         if ( !NT_STATUS_IS_OK(nt_status) ) {
 262                 DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
 263                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 264                         return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE;
 265                 }
 266                 return nt_status;
 267         }
 268
 269         /* store a successful connection */
 270
 271         saf_store(domain, dc_name);
 272
 273         /*
 274          * If this call succeeds, we now have lots of info about the user
 275          * in the info3 structure.
 276          */
 277
 278         nt_status = rpccli_netlogon_network_logon(netlogon_creds,
 279                                                   netlogon_pipe->binding_handle,
 280                                                   mem_ctx,
 281                                                   user_info->logon_parameters,         /* flags such as 'allow workstation logon' */
 282                                                   user_info->client.account_name,      /* user name logging on. */
 283                                                   user_info->client.domain_name,       /* domain name */
 284                                                   user_info->workstation_name,         /* workstation name */
 285                                                   chal,                                /* 8 byte challenge. */
 286                                                   user_info->password.response.lanman, /* lanman 24 byte response */
 287                                                   user_info->password.response.nt,     /* nt 24 byte response */
 288                                                   &authoritative,
 289                                                   &flags,
 290                                                   &info3);                             /* info3 out */
 291
 292         /* Let go as soon as possible so we avoid any potential deadlocks
 293            with winbind lookup up users or groups. */
 294
 295         TALLOC_FREE(mutex);
 296
 297         if (!NT_STATUS_IS_OK(nt_status)) {
 298                 DEBUG(0,("domain_client_validate: unable to validate password "
 299                          "for user %s in domain %s to Domain controller %s. "
 300                          "Error was %s.\n", user_info->client.account_name,
 301                          user_info->client.domain_name, dc_name,
 302                          nt_errstr(nt_status)));
 303
 304                 /* map to something more useful */
 305                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 306                         nt_status = NT_STATUS_NO_LOGON_SERVERS;
 307                 }
 308         } else {
 309                 nt_status = make_server_info_info3(mem_ctx,
 310                                                    user_info->client.account_name,
 311                                                    domain,
 312                                                    server_info,
 313                                                    info3);
 314
 315                 if (NT_STATUS_IS_OK(nt_status)) {
 316                         (*server_info)->nss_token |= user_info->was_mapped;
 317                         netsamlogon_cache_store(user_info->client.account_name, info3);
 318                         TALLOC_FREE(info3);
 319                 }
 320         }
 321
 322         /* Note - once the cli stream is shutdown the mem_ctx used
 323            to allocate the other_sids and gids structures has been deleted - so
 324            these pointers are no longer valid..... */
 325
 326         cli_shutdown(cli);
 327         return nt_status;
 328 }
 329
 330 /****************************************************************************
 331  Check for a valid username and password in security=domain mode.
 332 ****************************************************************************/
 333
 334 static NTSTATUS check_ntdomain_security(const struct auth_context *auth_context,
 335                                         void *my_private_data,
 336                                         TALLOC_CTX *mem_ctx,
 337                                         const struct auth_usersupplied_info *user_info,
 338                                         struct auth_serversupplied_info **server_info)
 339 {
 340         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 341         const char *domain = lp_workgroup();
 342         fstring dc_name;
 343         struct sockaddr_storage dc_ss;
 344
 345         if ( lp_server_role() != ROLE_DOMAIN_MEMBER ) {
 346                 DEBUG(0,("check_ntdomain_security: Configuration error!  Cannot use "
 347                         "ntdomain auth method when not a member of a domain.\n"));
 348                 return NT_STATUS_NOT_IMPLEMENTED;
 349         }
 350
 351         if (!user_info || !server_info || !auth_context) {
 352                 DEBUG(1,("check_ntdomain_security: Critical variables not present.  Failing.\n"));
 353                 return NT_STATUS_INVALID_PARAMETER;
 354         }
 355
 356         DEBUG(10, ("Check auth for: [%s]\n", user_info->mapped.account_name));
 357
 358         /*
 359          * Check that the requested domain is not our own machine name.
 360          * If it is, we should never check the PDC here, we use our own local
 361          * password file.
 362          */
 363
 364         if(strequal(get_global_sam_name(), user_info->mapped.domain_name)) {
 365                 DEBUG(3,("check_ntdomain_security: Requested domain was for this machine.\n"));
 366                 return NT_STATUS_NOT_IMPLEMENTED;
 367         }
 368
 369         /* we need our DC to send the net_sam_logon() request to */
 370
 371         if ( !get_dc_name(domain, NULL, dc_name, &dc_ss) ) {
 372                 DEBUG(5,("check_ntdomain_security: unable to locate a DC for domain %s\n",
 373                         user_info->mapped.domain_name));
 374                 return NT_STATUS_NO_LOGON_SERVERS;
 375         }
 376
 377         nt_status = domain_client_validate(mem_ctx,
 378                                         user_info,
 379                                         domain,
 380                                         (uchar *)auth_context->challenge.data,
 381                                         server_info,
 382                                         dc_name,
 383                                         &dc_ss);
 384
 385         return nt_status;
 386 }
 387
 388 /* module initialisation */
 389 static NTSTATUS auth_init_ntdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 390 {
 391         struct auth_methods *result;
 392
 393         result = talloc_zero(auth_context, struct auth_methods);
 394         if (result == NULL) {
 395                 return NT_STATUS_NO_MEMORY;
 396         }
 397         result->name = "ntdomain";
 398         result->auth = check_ntdomain_security;
 399
 400         *auth_method = result;
 401         return NT_STATUS_OK;
 402 }
 403
 404
 405 /****************************************************************************
 406  Check for a valid username and password in a trusted domain
 407 ****************************************************************************/
 408
 409 static NTSTATUS check_trustdomain_security(const struct auth_context *auth_context,
 410                                            void *my_private_data,
 411                                            TALLOC_CTX *mem_ctx,
 412                                            const struct auth_usersupplied_info *user_info,
 413                                            struct auth_serversupplied_info **server_info)
 414 {
 415         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 416         fstring dc_name;
 417         struct sockaddr_storage dc_ss;
 418
 419         if (!user_info || !server_info || !auth_context) {
 420                 DEBUG(1,("check_trustdomain_security: Critical variables not present.  Failing.\n"));
 421                 return NT_STATUS_INVALID_PARAMETER;
 422         }
 423
 424         DEBUG(10, ("Check auth for: [%s]\n", user_info->mapped.account_name));
 425
 426         /*
 427          * Check that the requested domain is not our own machine name or domain name.
 428          */
 429
 430         if( strequal(get_global_sam_name(), user_info->mapped.domain_name)) {
 431                 DEBUG(3,("check_trustdomain_security: Requested domain [%s] was for this machine.\n",
 432                         user_info->mapped.domain_name));
 433                 return NT_STATUS_NOT_IMPLEMENTED;
 434         }
 435
 436         /* No point is bothering if this is not a trusted domain.
 437            This return makes "map to guest = bad user" work again.
 438            The logic is that if we know nothing about the domain, that
 439            user is not known to us and does not exist */
 440
 441         if ( !is_trusted_domain( user_info->mapped.domain_name ) )
 442                 return NT_STATUS_NOT_IMPLEMENTED;
 443
 444         /* use get_dc_name() for consistency even through we know that it will be
 445            a netbios name */
 446
 447         if ( !get_dc_name(user_info->mapped.domain_name, NULL, dc_name, &dc_ss) ) {
 448                 DEBUG(5,("check_trustdomain_security: unable to locate a DC for domain %s\n",
 449                         user_info->mapped.domain_name));
 450                 return NT_STATUS_NO_LOGON_SERVERS;
 451         }
 452
 453         nt_status = domain_client_validate(mem_ctx,
 454                                            user_info,
 455                                            user_info->mapped.domain_name,
 456                                            (uchar *)auth_context->challenge.data,
 457                                            server_info,
 458                                            dc_name,
 459                                            &dc_ss);
 460
 461         return nt_status;
 462 }
 463
 464 /* module initialisation */
 465 static NTSTATUS auth_init_trustdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 466 {
 467         struct auth_methods *result;
 468
 469         result = talloc_zero(auth_context, struct auth_methods);
 470         if (result == NULL) {
 471                 return NT_STATUS_NO_MEMORY;
 472         }
 473         result->name = "trustdomain";
 474         result->auth = check_trustdomain_security;
 475
 476         *auth_method = result;
 477         return NT_STATUS_OK;
 478 }
 479
 480 NTSTATUS auth_domain_init(void)
 481 {
 482         smb_register_auth(AUTH_INTERFACE_VERSION, "trustdomain", auth_init_trustdomain);
 483         smb_register_auth(AUTH_INTERFACE_VERSION, "ntdomain", auth_init_ntdomain);
 484         return NT_STATUS_OK;
 485 }