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
  31 #undef DBGC_CLASS
  32 #define DBGC_CLASS DBGC_AUTH
  33
  34 extern bool global_machine_password_needs_changing;
  35 static struct named_mutex *mutex;
  36
  37 /*
  38  * Change machine password (called from main loop
  39  * idle timeout. Must be done as root.
  40  */
  41
  42 void attempt_machine_password_change(void)
  43 {
  44         unsigned char trust_passwd_hash[16];
  45         time_t lct;
  46         void *lock;
  47
  48         if (!global_machine_password_needs_changing) {
  49                 return;
  50         }
  51
  52         if (lp_security() != SEC_DOMAIN) {
  53                 return;
  54         }
  55
  56         /*
  57          * We're in domain level security, and the code that
  58          * read the machine password flagged that the machine
  59          * password needs changing.
  60          */
  61
  62         /*
  63          * First, open the machine password file with an exclusive lock.
  64          */
  65
  66         lock = secrets_get_trust_account_lock(NULL, lp_workgroup());
  67
  68         if (lock == NULL) {
  69                 DEBUG(0,("attempt_machine_password_change: unable to lock "
  70                         "the machine account password for machine %s in "
  71                         "domain %s.\n",
  72                         global_myname(), lp_workgroup() ));
  73                 return;
  74         }
  75
  76         if(!secrets_fetch_trust_account_password(lp_workgroup(),
  77                         trust_passwd_hash, &lct, NULL)) {
  78                 DEBUG(0,("attempt_machine_password_change: unable to read the "
  79                         "machine account password for %s in domain %s.\n",
  80                         global_myname(), lp_workgroup()));
  81                 TALLOC_FREE(lock);
  82                 return;
  83         }
  84
  85         /*
  86          * Make sure someone else hasn't already done this.
  87          */
  88
  89         if(time(NULL) < lct + lp_machine_password_timeout()) {
  90                 global_machine_password_needs_changing = false;
  91                 TALLOC_FREE(lock);
  92                 return;
  93         }
  94
  95         /* always just contact the PDC here */
  96
  97         change_trust_account_password( lp_workgroup(), NULL);
  98         global_machine_password_needs_changing = false;
  99         TALLOC_FREE(lock);
 100 }
 101
 102 /**
 103  * Connect to a remote server for (inter)domain security authenticaion.
 104  *
 105  * @param cli the cli to return containing the active connection
 106  * @param server either a machine name or text IP address to
 107  *               connect to.
 108  * @param setup_creds_as domain account to setup credentials as
 109  * @param sec_chan a switch value to distinguish between domain
 110  *                 member and interdomain authentication
 111  * @param trust_passwd the trust password to establish the
 112  *                     credentials with.
 113  *
 114  **/
 115
 116 static NTSTATUS connect_to_domain_password_server(struct cli_state **cli,
 117                                                 const char *domain,
 118                                                 const char *dc_name,
 119                                                 struct sockaddr_storage *dc_ss,
 120                                                 struct rpc_pipe_client **pipe_ret)
 121 {
 122         NTSTATUS result;
 123         struct rpc_pipe_client *netlogon_pipe = NULL;
 124
 125         *cli = NULL;
 126
 127         *pipe_ret = NULL;
 128
 129         /* TODO: Send a SAMLOGON request to determine whether this is a valid
 130            logonserver.  We can avoid a 30-second timeout if the DC is down
 131            if the SAMLOGON request fails as it is only over UDP. */
 132
 133         /* we use a mutex to prevent two connections at once - when a
 134            Win2k PDC get two connections where one hasn't completed a
 135            session setup yet it will send a TCP reset to the first
 136            connection (tridge) */
 137
 138         /*
 139          * With NT4.x DC's *all* authentication must be serialized to avoid
 140          * ACCESS_DENIED errors if 2 auths are done from the same machine. JRA.
 141          */
 142
 143         mutex = grab_named_mutex(NULL, dc_name, 10);
 144         if (mutex == NULL) {
 145                 return NT_STATUS_NO_LOGON_SERVERS;
 146         }
 147
 148         /* Attempt connection */
 149         result = cli_full_connection(cli, global_myname(), dc_name, dc_ss, 0,
 150                 "IPC$", "IPC", "", "", "", 0, Undefined);
 151
 152         if (!NT_STATUS_IS_OK(result)) {
 153                 /* map to something more useful */
 154                 if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
 155                         result = NT_STATUS_NO_LOGON_SERVERS;
 156                 }
 157
 158                 if (*cli) {
 159                         cli_shutdown(*cli);
 160                         *cli = NULL;
 161                 }
 162
 163                 TALLOC_FREE(mutex);
 164                 return result;
 165         }
 166
 167         /*
 168          * We now have an anonymous connection to IPC$ on the domain password server.
 169          */
 170
 171         /*
 172          * Even if the connect succeeds we need to setup the netlogon
 173          * pipe here. We do this as we may just have changed the domain
 174          * account password on the PDC and yet we may be talking to
 175          * a BDC that doesn't have this replicated yet. In this case
 176          * a successful connect to a DC needs to take the netlogon connect
 177          * into account also. This patch from "Bjart Kvarme" <bjart.kvarme@usit.uio.no>.
 178          */
 179
 180         /* open the netlogon pipe. */
 181         if (lp_client_schannel()) {
 182                 /* We also setup the creds chain in the open_schannel call. */
 183                 result = cli_rpc_pipe_open_schannel(
 184                         *cli, &ndr_table_netlogon.syntax_id, NCACN_NP,
 185                         DCERPC_AUTH_LEVEL_PRIVACY, domain, &netlogon_pipe);
 186         } else {
 187                 result = cli_rpc_pipe_open_noauth(
 188                         *cli, &ndr_table_netlogon.syntax_id, &netlogon_pipe);
 189         }
 190
 191         if (!NT_STATUS_IS_OK(result)) {
 192                 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
 193 machine %s. Error was : %s.\n", dc_name, nt_errstr(result)));
 194                 cli_shutdown(*cli);
 195                 *cli = NULL;
 196                 TALLOC_FREE(mutex);
 197                 return result;
 198         }
 199
 200         if (!lp_client_schannel()) {
 201                 /* We need to set up a creds chain on an unauthenticated netlogon pipe. */
 202                 uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
 203                 enum netr_SchannelType sec_chan_type = 0;
 204                 unsigned char machine_pwd[16];
 205                 const char *account_name;
 206
 207                 if (!get_trust_pw_hash(domain, machine_pwd, &account_name,
 208                                        &sec_chan_type))
 209                 {
 210                         DEBUG(0, ("connect_to_domain_password_server: could not fetch "
 211                         "trust account password for domain '%s'\n",
 212                                 domain));
 213                         cli_shutdown(*cli);
 214                         *cli = NULL;
 215                         TALLOC_FREE(mutex);
 216                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 217                 }
 218
 219                 result = rpccli_netlogon_setup_creds(netlogon_pipe,
 220                                         dc_name, /* server name */
 221                                         domain, /* domain */
 222                                         global_myname(), /* client name */
 223                                         account_name, /* machine account name */
 224                                         machine_pwd,
 225                                         sec_chan_type,
 226                                         &neg_flags);
 227
 228                 if (!NT_STATUS_IS_OK(result)) {
 229                         cli_shutdown(*cli);
 230                         *cli = NULL;
 231                         TALLOC_FREE(mutex);
 232                         return result;
 233                 }
 234         }
 235
 236         if(!netlogon_pipe) {
 237                 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
 238 machine %s. Error was : %s.\n", dc_name, cli_errstr(*cli)));
 239                 cli_shutdown(*cli);
 240                 *cli = NULL;
 241                 TALLOC_FREE(mutex);
 242                 return NT_STATUS_NO_LOGON_SERVERS;
 243         }
 244
 245         /* We exit here with the mutex *locked*. JRA */
 246
 247         *pipe_ret = netlogon_pipe;
 248
 249         return NT_STATUS_OK;
 250 }
 251
 252 /***********************************************************************
 253  Do the same as security=server, but using NT Domain calls and a session
 254  key from the machine password.  If the server parameter is specified
 255  use it, otherwise figure out a server from the 'password server' param.
 256 ************************************************************************/
 257
 258 static NTSTATUS domain_client_validate(TALLOC_CTX *mem_ctx,
 259                                         const struct auth_usersupplied_info *user_info,
 260                                         const char *domain,
 261                                         uchar chal[8],
 262                                         struct auth_serversupplied_info **server_info,
 263                                         const char *dc_name,
 264                                         struct sockaddr_storage *dc_ss)
 265
 266 {
 267         struct netr_SamInfo3 *info3 = NULL;
 268         struct cli_state *cli = NULL;
 269         struct rpc_pipe_client *netlogon_pipe = NULL;
 270         NTSTATUS nt_status = NT_STATUS_NO_LOGON_SERVERS;
 271         int i;
 272
 273         /*
 274          * At this point, smb_apasswd points to the lanman response to
 275          * the challenge in local_challenge, and smb_ntpasswd points to
 276          * the NT response to the challenge in local_challenge. Ship
 277          * these over the secure channel to a domain controller and
 278          * see if they were valid.
 279          */
 280
 281         /* rety loop for robustness */
 282
 283         for (i = 0; !NT_STATUS_IS_OK(nt_status) && (i < 3); i++) {
 284                 nt_status = connect_to_domain_password_server(&cli,
 285                                                         domain,
 286                                                         dc_name,
 287                                                         dc_ss,
 288                                                         &netlogon_pipe);
 289         }
 290
 291         if ( !NT_STATUS_IS_OK(nt_status) ) {
 292                 DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
 293                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 294                         return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE;
 295                 }
 296                 return nt_status;
 297         }
 298
 299         /* store a successful connection */
 300
 301         saf_store( domain, cli->desthost );
 302
 303         /*
 304          * If this call succeeds, we now have lots of info about the user
 305          * in the info3 structure.
 306          */
 307
 308         nt_status = rpccli_netlogon_sam_network_logon(netlogon_pipe,
 309                                                       mem_ctx,
 310                                                       user_info->logon_parameters,         /* flags such as 'allow workstation logon' */
 311                                                       dc_name,                             /* server name */
 312                                                       user_info->client.account_name,      /* user name logging on. */
 313                                                       user_info->client.domain_name,       /* domain name */
 314                                                       user_info->workstation_name,         /* workstation name */
 315                                                       chal,                                /* 8 byte challenge. */
 316                                                       3,                                   /* validation level */
 317                                                       user_info->password.response.lanman, /* lanman 24 byte response */
 318                                                       user_info->password.response.nt,     /* nt 24 byte response */
 319                                                       &info3);                             /* info3 out */
 320
 321         /* Let go as soon as possible so we avoid any potential deadlocks
 322            with winbind lookup up users or groups. */
 323
 324         TALLOC_FREE(mutex);
 325
 326         if (!NT_STATUS_IS_OK(nt_status)) {
 327                 DEBUG(0,("domain_client_validate: unable to validate password "
 328                          "for user %s in domain %s to Domain controller %s. "
 329                          "Error was %s.\n", user_info->client.account_name,
 330                          user_info->client.domain_name, dc_name,
 331                          nt_errstr(nt_status)));
 332
 333                 /* map to something more useful */
 334                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 335                         nt_status = NT_STATUS_NO_LOGON_SERVERS;
 336                 }
 337         } else {
 338                 nt_status = make_server_info_info3(mem_ctx,
 339                                                    user_info->client.account_name,
 340                                                    domain,
 341                                                    server_info,
 342                                                    info3);
 343
 344                 if (NT_STATUS_IS_OK(nt_status)) {
 345                         (*server_info)->nss_token |= user_info->was_mapped;
 346                         netsamlogon_cache_store(user_info->client.account_name, info3);
 347                         TALLOC_FREE(info3);
 348                 }
 349         }
 350
 351         /* Note - once the cli stream is shutdown the mem_ctx used
 352            to allocate the other_sids and gids structures has been deleted - so
 353            these pointers are no longer valid..... */
 354
 355         cli_shutdown(cli);
 356         return nt_status;
 357 }
 358
 359 /****************************************************************************
 360  Check for a valid username and password in security=domain mode.
 361 ****************************************************************************/
 362
 363 static NTSTATUS check_ntdomain_security(const struct auth_context *auth_context,
 364                                         void *my_private_data,
 365                                         TALLOC_CTX *mem_ctx,
 366                                         const struct auth_usersupplied_info *user_info,
 367                                         struct auth_serversupplied_info **server_info)
 368 {
 369         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 370         const char *domain = lp_workgroup();
 371         fstring dc_name;
 372         struct sockaddr_storage dc_ss;
 373
 374         if ( lp_server_role() != ROLE_DOMAIN_MEMBER ) {
 375                 DEBUG(0,("check_ntdomain_security: Configuration error!  Cannot use "
 376                         "ntdomain auth method when not a member of a domain.\n"));
 377                 return NT_STATUS_NOT_IMPLEMENTED;
 378         }
 379
 380         if (!user_info || !server_info || !auth_context) {
 381                 DEBUG(1,("check_ntdomain_security: Critical variables not present.  Failing.\n"));
 382                 return NT_STATUS_INVALID_PARAMETER;
 383         }
 384
 385         DEBUG(10, ("Check auth for: [%s]\n", user_info->mapped.account_name));
 386
 387         /*
 388          * Check that the requested domain is not our own machine name.
 389          * If it is, we should never check the PDC here, we use our own local
 390          * password file.
 391          */
 392
 393         if(strequal(get_global_sam_name(), user_info->mapped.domain_name)) {
 394                 DEBUG(3,("check_ntdomain_security: Requested domain was for this machine.\n"));
 395                 return NT_STATUS_NOT_IMPLEMENTED;
 396         }
 397
 398         /* we need our DC to send the net_sam_logon() request to */
 399
 400         if ( !get_dc_name(domain, NULL, dc_name, &dc_ss) ) {
 401                 DEBUG(5,("check_ntdomain_security: unable to locate a DC for domain %s\n",
 402                         user_info->mapped.domain_name));
 403                 return NT_STATUS_NO_LOGON_SERVERS;
 404         }
 405
 406         nt_status = domain_client_validate(mem_ctx,
 407                                         user_info,
 408                                         domain,
 409                                         (uchar *)auth_context->challenge.data,
 410                                         server_info,
 411                                         dc_name,
 412                                         &dc_ss);
 413
 414         return nt_status;
 415 }
 416
 417 /* module initialisation */
 418 static NTSTATUS auth_init_ntdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 419 {
 420         struct auth_methods *result;
 421
 422         result = TALLOC_ZERO_P(auth_context, struct auth_methods);
 423         if (result == NULL) {
 424                 return NT_STATUS_NO_MEMORY;
 425         }
 426         result->name = "ntdomain";
 427         result->auth = check_ntdomain_security;
 428
 429         *auth_method = result;
 430         return NT_STATUS_OK;
 431 }
 432
 433
 434 /****************************************************************************
 435  Check for a valid username and password in a trusted domain
 436 ****************************************************************************/
 437
 438 static NTSTATUS check_trustdomain_security(const struct auth_context *auth_context,
 439                                            void *my_private_data,
 440                                            TALLOC_CTX *mem_ctx,
 441                                            const struct auth_usersupplied_info *user_info,
 442                                            struct auth_serversupplied_info **server_info)
 443 {
 444         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 445         unsigned char trust_md4_password[16];
 446         char *trust_password;
 447         fstring dc_name;
 448         struct sockaddr_storage dc_ss;
 449
 450         if (!user_info || !server_info || !auth_context) {
 451                 DEBUG(1,("check_trustdomain_security: Critical variables not present.  Failing.\n"));
 452                 return NT_STATUS_INVALID_PARAMETER;
 453         }
 454
 455         DEBUG(10, ("Check auth for: [%s]\n", user_info->mapped.account_name));
 456
 457         /*
 458          * Check that the requested domain is not our own machine name or domain name.
 459          */
 460
 461         if( strequal(get_global_sam_name(), user_info->mapped.domain_name)) {
 462                 DEBUG(3,("check_trustdomain_security: Requested domain [%s] was for this machine.\n",
 463                         user_info->mapped.domain_name));
 464                 return NT_STATUS_NOT_IMPLEMENTED;
 465         }
 466
 467         /* No point is bothering if this is not a trusted domain.
 468            This return makes "map to guest = bad user" work again.
 469            The logic is that if we know nothing about the domain, that
 470            user is not known to us and does not exist */
 471
 472         if ( !is_trusted_domain( user_info->mapped.domain_name ) )
 473                 return NT_STATUS_NOT_IMPLEMENTED;
 474
 475         /*
 476          * Get the trusted account password for the trusted domain
 477          * No need to become_root() as secrets_init() is done at startup.
 478          */
 479
 480         if (!pdb_get_trusteddom_pw(user_info->mapped.domain_name, &trust_password,
 481                                    NULL, NULL)) {
 482                 DEBUG(0, ("check_trustdomain_security: could not fetch trust "
 483                           "account password for domain %s\n",
 484                           user_info->mapped.domain_name));
 485                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 486         }
 487
 488 #ifdef DEBUG_PASSWORD
 489         DEBUG(100, ("Trust password for domain %s is %s\n", user_info->mapped.domain_name,
 490                     trust_password));
 491 #endif
 492         E_md4hash(trust_password, trust_md4_password);
 493         SAFE_FREE(trust_password);
 494
 495 #if 0
 496         /* Test if machine password is expired and need to be changed */
 497         if (time(NULL) > last_change_time + (time_t)lp_machine_password_timeout())
 498         {
 499                 global_machine_password_needs_changing = True;
 500         }
 501 #endif
 502
 503         /* use get_dc_name() for consistency even through we know that it will be
 504            a netbios name */
 505
 506         if ( !get_dc_name(user_info->mapped.domain_name, NULL, dc_name, &dc_ss) ) {
 507                 DEBUG(5,("check_trustdomain_security: unable to locate a DC for domain %s\n",
 508                         user_info->mapped.domain_name));
 509                 return NT_STATUS_NO_LOGON_SERVERS;
 510         }
 511
 512         nt_status = domain_client_validate(mem_ctx,
 513                                            user_info,
 514                                            user_info->mapped.domain_name,
 515                                            (uchar *)auth_context->challenge.data,
 516                                            server_info,
 517                                            dc_name,
 518                                            &dc_ss);
 519
 520         return nt_status;
 521 }
 522
 523 /* module initialisation */
 524 static NTSTATUS auth_init_trustdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 525 {
 526         struct auth_methods *result;
 527
 528         result = TALLOC_ZERO_P(auth_context, struct auth_methods);
 529         if (result == NULL) {
 530                 return NT_STATUS_NO_MEMORY;
 531         }
 532         result->name = "trustdomain";
 533         result->auth = check_trustdomain_security;
 534
 535         *auth_method = result;
 536         return NT_STATUS_OK;
 537 }
 538
 539 NTSTATUS auth_domain_init(void)
 540 {
 541         smb_register_auth(AUTH_INTERFACE_VERSION, "trustdomain", auth_init_trustdomain);
 542         smb_register_auth(AUTH_INTERFACE_VERSION, "ntdomain", auth_init_ntdomain);
 543         return NT_STATUS_OK;
 544 }