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                         lp_netbios_name(), 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                         lp_netbios_name(), 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                                                 const 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, lp_netbios_name(), dc_name, dc_ss, 0,
 150                 "IPC$", "IPC", "", "", "", 0, SMB_SIGNING_DEFAULT);
 151
 152         if (!NT_STATUS_IS_OK(result)) {
 153                 /* map to something more useful */
 154                 if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
 155                         result = NT_STATUS_NO_LOGON_SERVERS;
 156                 }
 157
 158                 if (*cli) {
 159                         cli_shutdown(*cli);
 160                         *cli = NULL;
 161                 }
 162
 163                 TALLOC_FREE(mutex);
 164                 return result;
 165         }
 166
 167         /*
 168          * We now have an anonymous connection to IPC$ 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                                         lp_netbios_name(), /* 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 "
 238                           "the domain client session to machine %s. Error "
 239                           "was : %s.\n", dc_name, nt_errstr(result)));
 240                 cli_shutdown(*cli);
 241                 *cli = NULL;
 242                 TALLOC_FREE(mutex);
 243                 return NT_STATUS_NO_LOGON_SERVERS;
 244         }
 245
 246         /* We exit here with the mutex *locked*. JRA */
 247
 248         *pipe_ret = netlogon_pipe;
 249
 250         return NT_STATUS_OK;
 251 }
 252
 253 /***********************************************************************
 254  Do the same as security=server, but using NT Domain calls and a session
 255  key from the machine password.  If the server parameter is specified
 256  use it, otherwise figure out a server from the 'password server' param.
 257 ************************************************************************/
 258
 259 static NTSTATUS domain_client_validate(TALLOC_CTX *mem_ctx,
 260                                         const struct auth_usersupplied_info *user_info,
 261                                         const char *domain,
 262                                         uchar chal[8],
 263                                         struct auth_serversupplied_info **server_info,
 264                                         const char *dc_name,
 265                                         const struct sockaddr_storage *dc_ss)
 266
 267 {
 268         struct netr_SamInfo3 *info3 = NULL;
 269         struct cli_state *cli = NULL;
 270         struct rpc_pipe_client *netlogon_pipe = NULL;
 271         NTSTATUS nt_status = NT_STATUS_NO_LOGON_SERVERS;
 272         int i;
 273
 274         /*
 275          * At this point, smb_apasswd points to the lanman response to
 276          * the challenge in local_challenge, and smb_ntpasswd points to
 277          * the NT response to the challenge in local_challenge. Ship
 278          * these over the secure channel to a domain controller and
 279          * see if they were valid.
 280          */
 281
 282         /* rety loop for robustness */
 283
 284         for (i = 0; !NT_STATUS_IS_OK(nt_status) && (i < 3); i++) {
 285                 nt_status = connect_to_domain_password_server(&cli,
 286                                                         domain,
 287                                                         dc_name,
 288                                                         dc_ss,
 289                                                         &netlogon_pipe);
 290         }
 291
 292         if ( !NT_STATUS_IS_OK(nt_status) ) {
 293                 DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
 294                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 295                         return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE;
 296                 }
 297                 return nt_status;
 298         }
 299
 300         /* store a successful connection */
 301
 302         saf_store(domain, dc_name);
 303
 304         /*
 305          * If this call succeeds, we now have lots of info about the user
 306          * in the info3 structure.
 307          */
 308
 309         nt_status = rpccli_netlogon_sam_network_logon(netlogon_pipe,
 310                                                       mem_ctx,
 311                                                       user_info->logon_parameters,         /* flags such as 'allow workstation logon' */
 312                                                       dc_name,                             /* server name */
 313                                                       user_info->client.account_name,      /* user name logging on. */
 314                                                       user_info->client.domain_name,       /* domain name */
 315                                                       user_info->workstation_name,         /* workstation name */
 316                                                       chal,                                /* 8 byte challenge. */
 317                                                       3,                                   /* validation level */
 318                                                       user_info->password.response.lanman, /* lanman 24 byte response */
 319                                                       user_info->password.response.nt,     /* nt 24 byte response */
 320                                                       &info3);                             /* info3 out */
 321
 322         /* Let go as soon as possible so we avoid any potential deadlocks
 323            with winbind lookup up users or groups. */
 324
 325         TALLOC_FREE(mutex);
 326
 327         if (!NT_STATUS_IS_OK(nt_status)) {
 328                 DEBUG(0,("domain_client_validate: unable to validate password "
 329                          "for user %s in domain %s to Domain controller %s. "
 330                          "Error was %s.\n", user_info->client.account_name,
 331                          user_info->client.domain_name, dc_name,
 332                          nt_errstr(nt_status)));
 333
 334                 /* map to something more useful */
 335                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 336                         nt_status = NT_STATUS_NO_LOGON_SERVERS;
 337                 }
 338         } else {
 339                 nt_status = make_server_info_info3(mem_ctx,
 340                                                    user_info->client.account_name,
 341                                                    domain,
 342                                                    server_info,
 343                                                    info3);
 344
 345                 if (NT_STATUS_IS_OK(nt_status)) {
 346                         (*server_info)->nss_token |= user_info->was_mapped;
 347                         netsamlogon_cache_store(user_info->client.account_name, info3);
 348                         TALLOC_FREE(info3);
 349                 }
 350         }
 351
 352         /* Note - once the cli stream is shutdown the mem_ctx used
 353            to allocate the other_sids and gids structures has been deleted - so
 354            these pointers are no longer valid..... */
 355
 356         cli_shutdown(cli);
 357         return nt_status;
 358 }
 359
 360 /****************************************************************************
 361  Check for a valid username and password in security=domain mode.
 362 ****************************************************************************/
 363
 364 static NTSTATUS check_ntdomain_security(const struct auth_context *auth_context,
 365                                         void *my_private_data,
 366                                         TALLOC_CTX *mem_ctx,
 367                                         const struct auth_usersupplied_info *user_info,
 368                                         struct auth_serversupplied_info **server_info)
 369 {
 370         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 371         const char *domain = lp_workgroup();
 372         fstring dc_name;
 373         struct sockaddr_storage dc_ss;
 374
 375         if ( lp_server_role() != ROLE_DOMAIN_MEMBER ) {
 376                 DEBUG(0,("check_ntdomain_security: Configuration error!  Cannot use "
 377                         "ntdomain auth method when not a member of a domain.\n"));
 378                 return NT_STATUS_NOT_IMPLEMENTED;
 379         }
 380
 381         if (!user_info || !server_info || !auth_context) {
 382                 DEBUG(1,("check_ntdomain_security: Critical variables not present.  Failing.\n"));
 383                 return NT_STATUS_INVALID_PARAMETER;
 384         }
 385
 386         DEBUG(10, ("Check auth for: [%s]\n", user_info->mapped.account_name));
 387
 388         /*
 389          * Check that the requested domain is not our own machine name.
 390          * If it is, we should never check the PDC here, we use our own local
 391          * password file.
 392          */
 393
 394         if(strequal(get_global_sam_name(), user_info->mapped.domain_name)) {
 395                 DEBUG(3,("check_ntdomain_security: Requested domain was for this machine.\n"));
 396                 return NT_STATUS_NOT_IMPLEMENTED;
 397         }
 398
 399         /* we need our DC to send the net_sam_logon() request to */
 400
 401         if ( !get_dc_name(domain, NULL, dc_name, &dc_ss) ) {
 402                 DEBUG(5,("check_ntdomain_security: unable to locate a DC for domain %s\n",
 403                         user_info->mapped.domain_name));
 404                 return NT_STATUS_NO_LOGON_SERVERS;
 405         }
 406
 407         nt_status = domain_client_validate(mem_ctx,
 408                                         user_info,
 409                                         domain,
 410                                         (uchar *)auth_context->challenge.data,
 411                                         server_info,
 412                                         dc_name,
 413                                         &dc_ss);
 414
 415         return nt_status;
 416 }
 417
 418 /* module initialisation */
 419 static NTSTATUS auth_init_ntdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 420 {
 421         struct auth_methods *result;
 422
 423         result = talloc_zero(auth_context, struct auth_methods);
 424         if (result == NULL) {
 425                 return NT_STATUS_NO_MEMORY;
 426         }
 427         result->name = "ntdomain";
 428         result->auth = check_ntdomain_security;
 429
 430         *auth_method = result;
 431         return NT_STATUS_OK;
 432 }
 433
 434
 435 /****************************************************************************
 436  Check for a valid username and password in a trusted domain
 437 ****************************************************************************/
 438
 439 static NTSTATUS check_trustdomain_security(const struct auth_context *auth_context,
 440                                            void *my_private_data,
 441                                            TALLOC_CTX *mem_ctx,
 442                                            const struct auth_usersupplied_info *user_info,
 443                                            struct auth_serversupplied_info **server_info)
 444 {
 445         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 446         unsigned char trust_md4_password[16];
 447         char *trust_password;
 448         fstring dc_name;
 449         struct sockaddr_storage dc_ss;
 450
 451         if (!user_info || !server_info || !auth_context) {
 452                 DEBUG(1,("check_trustdomain_security: Critical variables not present.  Failing.\n"));
 453                 return NT_STATUS_INVALID_PARAMETER;
 454         }
 455
 456         DEBUG(10, ("Check auth for: [%s]\n", user_info->mapped.account_name));
 457
 458         /*
 459          * Check that the requested domain is not our own machine name or domain name.
 460          */
 461
 462         if( strequal(get_global_sam_name(), user_info->mapped.domain_name)) {
 463                 DEBUG(3,("check_trustdomain_security: Requested domain [%s] was for this machine.\n",
 464                         user_info->mapped.domain_name));
 465                 return NT_STATUS_NOT_IMPLEMENTED;
 466         }
 467
 468         /* No point is bothering if this is not a trusted domain.
 469            This return makes "map to guest = bad user" work again.
 470            The logic is that if we know nothing about the domain, that
 471            user is not known to us and does not exist */
 472
 473         if ( !is_trusted_domain( user_info->mapped.domain_name ) )
 474                 return NT_STATUS_NOT_IMPLEMENTED;
 475
 476         /*
 477          * Get the trusted account password for the trusted domain
 478          * No need to become_root() as secrets_init() is done at startup.
 479          */
 480
 481         if (!pdb_get_trusteddom_pw(user_info->mapped.domain_name, &trust_password,
 482                                    NULL, NULL)) {
 483                 DEBUG(0, ("check_trustdomain_security: could not fetch trust "
 484                           "account password for domain %s\n",
 485                           user_info->mapped.domain_name));
 486                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 487         }
 488
 489 #ifdef DEBUG_PASSWORD
 490         DEBUG(100, ("Trust password for domain %s is %s\n", user_info->mapped.domain_name,
 491                     trust_password));
 492 #endif
 493         E_md4hash(trust_password, trust_md4_password);
 494         SAFE_FREE(trust_password);
 495
 496 #if 0
 497         /* Test if machine password is expired and need to be changed */
 498         if (time(NULL) > last_change_time + (time_t)lp_machine_password_timeout())
 499         {
 500                 global_machine_password_needs_changing = True;
 501         }
 502 #endif
 503
 504         /* use get_dc_name() for consistency even through we know that it will be
 505            a netbios name */
 506
 507         if ( !get_dc_name(user_info->mapped.domain_name, NULL, dc_name, &dc_ss) ) {
 508                 DEBUG(5,("check_trustdomain_security: unable to locate a DC for domain %s\n",
 509                         user_info->mapped.domain_name));
 510                 return NT_STATUS_NO_LOGON_SERVERS;
 511         }
 512
 513         nt_status = domain_client_validate(mem_ctx,
 514                                            user_info,
 515                                            user_info->mapped.domain_name,
 516                                            (uchar *)auth_context->challenge.data,
 517                                            server_info,
 518                                            dc_name,
 519                                            &dc_ss);
 520
 521         return nt_status;
 522 }
 523
 524 /* module initialisation */
 525 static NTSTATUS auth_init_trustdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 526 {
 527         struct auth_methods *result;
 528
 529         result = talloc_zero(auth_context, struct auth_methods);
 530         if (result == NULL) {
 531                 return NT_STATUS_NO_MEMORY;
 532         }
 533         result->name = "trustdomain";
 534         result->auth = check_trustdomain_security;
 535
 536         *auth_method = result;
 537         return NT_STATUS_OK;
 538 }
 539
 540 NTSTATUS auth_domain_init(void)
 541 {
 542         smb_register_auth(AUTH_INTERFACE_VERSION, "trustdomain", auth_init_trustdomain);
 543         smb_register_auth(AUTH_INTERFACE_VERSION, "ntdomain", auth_init_ntdomain);
 544         return NT_STATUS_OK;
 545 }