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 "../libcli/auth/libcli_auth.h"
  23 #include "../librpc/gen_ndr/ndr_netlogon.h"
  24 #include "rpc_client/cli_pipe.h"
  25 #include "rpc_client/cli_netlogon.h"
  26 #include "secrets.h"
  27 #include "passdb.h"
  28
  29 #undef DBGC_CLASS
  30 #define DBGC_CLASS DBGC_AUTH
  31
  32 extern bool global_machine_password_needs_changing;
  33 static struct named_mutex *mutex;
  34
  35 /*
  36  * Change machine password (called from main loop
  37  * idle timeout. Must be done as root.
  38  */
  39
  40 void attempt_machine_password_change(void)
  41 {
  42         unsigned char trust_passwd_hash[16];
  43         time_t lct;
  44         void *lock;
  45
  46         if (!global_machine_password_needs_changing) {
  47                 return;
  48         }
  49
  50         if (lp_security() != SEC_DOMAIN) {
  51                 return;
  52         }
  53
  54         /*
  55          * We're in domain level security, and the code that
  56          * read the machine password flagged that the machine
  57          * password needs changing.
  58          */
  59
  60         /*
  61          * First, open the machine password file with an exclusive lock.
  62          */
  63
  64         lock = secrets_get_trust_account_lock(NULL, lp_workgroup());
  65
  66         if (lock == NULL) {
  67                 DEBUG(0,("attempt_machine_password_change: unable to lock "
  68                         "the machine account password for machine %s in "
  69                         "domain %s.\n",
  70                         global_myname(), lp_workgroup() ));
  71                 return;
  72         }
  73
  74         if(!secrets_fetch_trust_account_password(lp_workgroup(),
  75                         trust_passwd_hash, &lct, NULL)) {
  76                 DEBUG(0,("attempt_machine_password_change: unable to read the "
  77                         "machine account password for %s in domain %s.\n",
  78                         global_myname(), lp_workgroup()));
  79                 TALLOC_FREE(lock);
  80                 return;
  81         }
  82
  83         /*
  84          * Make sure someone else hasn't already done this.
  85          */
  86
  87         if(time(NULL) < lct + lp_machine_password_timeout()) {
  88                 global_machine_password_needs_changing = false;
  89                 TALLOC_FREE(lock);
  90                 return;
  91         }
  92
  93         /* always just contact the PDC here */
  94
  95         change_trust_account_password( lp_workgroup(), NULL);
  96         global_machine_password_needs_changing = false;
  97         TALLOC_FREE(lock);
  98 }
  99
 100 /**
 101  * Connect to a remote server for (inter)domain security authenticaion.
 102  *
 103  * @param cli the cli to return containing the active connection
 104  * @param server either a machine name or text IP address to
 105  *               connect to.
 106  * @param setup_creds_as domain account to setup credentials as
 107  * @param sec_chan a switch value to distinguish between domain
 108  *                 member and interdomain authentication
 109  * @param trust_passwd the trust password to establish the
 110  *                     credentials with.
 111  *
 112  **/
 113
 114 static NTSTATUS connect_to_domain_password_server(struct cli_state **cli,
 115                                                 const char *domain,
 116                                                 const char *dc_name,
 117                                                 struct sockaddr_storage *dc_ss,
 118                                                 struct rpc_pipe_client **pipe_ret)
 119 {
 120         NTSTATUS result;
 121         struct rpc_pipe_client *netlogon_pipe = NULL;
 122
 123         *cli = NULL;
 124
 125         *pipe_ret = NULL;
 126
 127         /* TODO: Send a SAMLOGON request to determine whether this is a valid
 128            logonserver.  We can avoid a 30-second timeout if the DC is down
 129            if the SAMLOGON request fails as it is only over UDP. */
 130
 131         /* we use a mutex to prevent two connections at once - when a
 132            Win2k PDC get two connections where one hasn't completed a
 133            session setup yet it will send a TCP reset to the first
 134            connection (tridge) */
 135
 136         /*
 137          * With NT4.x DC's *all* authentication must be serialized to avoid
 138          * ACCESS_DENIED errors if 2 auths are done from the same machine. JRA.
 139          */
 140
 141         mutex = grab_named_mutex(NULL, dc_name, 10);
 142         if (mutex == NULL) {
 143                 return NT_STATUS_NO_LOGON_SERVERS;
 144         }
 145
 146         /* Attempt connection */
 147         result = cli_full_connection(cli, global_myname(), dc_name, dc_ss, 0,
 148                 "IPC$", "IPC", "", "", "", 0, Undefined);
 149
 150         if (!NT_STATUS_IS_OK(result)) {
 151                 /* map to something more useful */
 152                 if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
 153                         result = NT_STATUS_NO_LOGON_SERVERS;
 154                 }
 155
 156                 if (*cli) {
 157                         cli_shutdown(*cli);
 158                         *cli = NULL;
 159                 }
 160
 161                 TALLOC_FREE(mutex);
 162                 return result;
 163         }
 164
 165         /*
 166          * We now have an anonymous connection to IPC$ on the domain password server.
 167          */
 168
 169         /*
 170          * Even if the connect succeeds we need to setup the netlogon
 171          * pipe here. We do this as we may just have changed the domain
 172          * account password on the PDC and yet we may be talking to
 173          * a BDC that doesn't have this replicated yet. In this case
 174          * a successful connect to a DC needs to take the netlogon connect
 175          * into account also. This patch from "Bjart Kvarme" <bjart.kvarme@usit.uio.no>.
 176          */
 177
 178         /* open the netlogon pipe. */
 179         if (lp_client_schannel()) {
 180                 /* We also setup the creds chain in the open_schannel call. */
 181                 result = cli_rpc_pipe_open_schannel(
 182                         *cli, &ndr_table_netlogon.syntax_id, NCACN_NP,
 183                         DCERPC_AUTH_LEVEL_PRIVACY, domain, &netlogon_pipe);
 184         } else {
 185                 result = cli_rpc_pipe_open_noauth(
 186                         *cli, &ndr_table_netlogon.syntax_id, &netlogon_pipe);
 187         }
 188
 189         if (!NT_STATUS_IS_OK(result)) {
 190                 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
 191 machine %s. Error was : %s.\n", dc_name, nt_errstr(result)));
 192                 cli_shutdown(*cli);
 193                 *cli = NULL;
 194                 TALLOC_FREE(mutex);
 195                 return result;
 196         }
 197
 198         if (!lp_client_schannel()) {
 199                 /* We need to set up a creds chain on an unauthenticated netlogon pipe. */
 200                 uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
 201                 enum netr_SchannelType sec_chan_type = 0;
 202                 unsigned char machine_pwd[16];
 203                 const char *account_name;
 204
 205                 if (!get_trust_pw_hash(domain, machine_pwd, &account_name,
 206                                        &sec_chan_type))
 207                 {
 208                         DEBUG(0, ("connect_to_domain_password_server: could not fetch "
 209                         "trust account password for domain '%s'\n",
 210                                 domain));
 211                         cli_shutdown(*cli);
 212                         *cli = NULL;
 213                         TALLOC_FREE(mutex);
 214                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 215                 }
 216
 217                 result = rpccli_netlogon_setup_creds(netlogon_pipe,
 218                                         dc_name, /* server name */
 219                                         domain, /* domain */
 220                                         global_myname(), /* client name */
 221                                         account_name, /* machine account name */
 222                                         machine_pwd,
 223                                         sec_chan_type,
 224                                         &neg_flags);
 225
 226                 if (!NT_STATUS_IS_OK(result)) {
 227                         cli_shutdown(*cli);
 228                         *cli = NULL;
 229                         TALLOC_FREE(mutex);
 230                         return result;
 231                 }
 232         }
 233
 234         if(!netlogon_pipe) {
 235                 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
 236 machine %s. Error was : %s.\n", dc_name, cli_errstr(*cli)));
 237                 cli_shutdown(*cli);
 238                 *cli = NULL;
 239                 TALLOC_FREE(mutex);
 240                 return NT_STATUS_NO_LOGON_SERVERS;
 241         }
 242
 243         /* We exit here with the mutex *locked*. JRA */
 244
 245         *pipe_ret = netlogon_pipe;
 246
 247         return NT_STATUS_OK;
 248 }
 249
 250 /***********************************************************************
 251  Do the same as security=server, but using NT Domain calls and a session
 252  key from the machine password.  If the server parameter is specified
 253  use it, otherwise figure out a server from the 'password server' param.
 254 ************************************************************************/
 255
 256 static NTSTATUS domain_client_validate(TALLOC_CTX *mem_ctx,
 257                                         const struct auth_usersupplied_info *user_info,
 258                                         const char *domain,
 259                                         uchar chal[8],
 260                                         struct auth_serversupplied_info **server_info,
 261                                         const char *dc_name,
 262                                         struct sockaddr_storage *dc_ss)
 263
 264 {
 265         struct netr_SamInfo3 *info3 = NULL;
 266         struct cli_state *cli = NULL;
 267         struct rpc_pipe_client *netlogon_pipe = NULL;
 268         NTSTATUS nt_status = NT_STATUS_NO_LOGON_SERVERS;
 269         int i;
 270
 271         /*
 272          * At this point, smb_apasswd points to the lanman response to
 273          * the challenge in local_challenge, and smb_ntpasswd points to
 274          * the NT response to the challenge in local_challenge. Ship
 275          * these over the secure channel to a domain controller and
 276          * see if they were valid.
 277          */
 278
 279         /* rety loop for robustness */
 280
 281         for (i = 0; !NT_STATUS_IS_OK(nt_status) && (i < 3); i++) {
 282                 nt_status = connect_to_domain_password_server(&cli,
 283                                                         domain,
 284                                                         dc_name,
 285                                                         dc_ss,
 286                                                         &netlogon_pipe);
 287         }
 288
 289         if ( !NT_STATUS_IS_OK(nt_status) ) {
 290                 DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
 291                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 292                         return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE;
 293                 }
 294                 return nt_status;
 295         }
 296
 297         /* store a successful connection */
 298
 299         saf_store( domain, cli->desthost );
 300
 301         /*
 302          * If this call succeeds, we now have lots of info about the user
 303          * in the info3 structure.
 304          */
 305
 306         nt_status = rpccli_netlogon_sam_network_logon(netlogon_pipe,
 307                                                       mem_ctx,
 308                                                       user_info->logon_parameters,         /* flags such as 'allow workstation logon' */
 309                                                       dc_name,                             /* server name */
 310                                                       user_info->client.account_name,      /* user name logging on. */
 311                                                       user_info->client.domain_name,       /* domain name */
 312                                                       user_info->workstation_name,         /* workstation name */
 313                                                       chal,                                /* 8 byte challenge. */
 314                                                       3,                                   /* validation level */
 315                                                       user_info->password.response.lanman, /* lanman 24 byte response */
 316                                                       user_info->password.response.nt,     /* nt 24 byte response */
 317                                                       &info3);                             /* info3 out */
 318
 319         /* Let go as soon as possible so we avoid any potential deadlocks
 320            with winbind lookup up users or groups. */
 321
 322         TALLOC_FREE(mutex);
 323
 324         if (!NT_STATUS_IS_OK(nt_status)) {
 325                 DEBUG(0,("domain_client_validate: unable to validate password "
 326                          "for user %s in domain %s to Domain controller %s. "
 327                          "Error was %s.\n", user_info->client.account_name,
 328                          user_info->client.domain_name, dc_name,
 329                          nt_errstr(nt_status)));
 330
 331                 /* map to something more useful */
 332                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 333                         nt_status = NT_STATUS_NO_LOGON_SERVERS;
 334                 }
 335         } else {
 336                 nt_status = make_server_info_info3(mem_ctx,
 337                                                    user_info->client.account_name,
 338                                                    domain,
 339                                                    server_info,
 340                                                    info3);
 341
 342                 if (NT_STATUS_IS_OK(nt_status)) {
 343                         (*server_info)->nss_token |= user_info->was_mapped;
 344                         netsamlogon_cache_store(user_info->client.account_name, info3);
 345                         TALLOC_FREE(info3);
 346                 }
 347         }
 348
 349         /* Note - once the cli stream is shutdown the mem_ctx used
 350            to allocate the other_sids and gids structures has been deleted - so
 351            these pointers are no longer valid..... */
 352
 353         cli_shutdown(cli);
 354         return nt_status;
 355 }
 356
 357 /****************************************************************************
 358  Check for a valid username and password in security=domain mode.
 359 ****************************************************************************/
 360
 361 static NTSTATUS check_ntdomain_security(const struct auth_context *auth_context,
 362                                         void *my_private_data,
 363                                         TALLOC_CTX *mem_ctx,
 364                                         const struct auth_usersupplied_info *user_info,
 365                                         struct auth_serversupplied_info **server_info)
 366 {
 367         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 368         const char *domain = lp_workgroup();
 369         fstring dc_name;
 370         struct sockaddr_storage dc_ss;
 371
 372         if ( lp_server_role() != ROLE_DOMAIN_MEMBER ) {
 373                 DEBUG(0,("check_ntdomain_security: Configuration error!  Cannot use "
 374                         "ntdomain auth method when not a member of a domain.\n"));
 375                 return NT_STATUS_NOT_IMPLEMENTED;
 376         }
 377
 378         if (!user_info || !server_info || !auth_context) {
 379                 DEBUG(1,("check_ntdomain_security: Critical variables not present.  Failing.\n"));
 380                 return NT_STATUS_INVALID_PARAMETER;
 381         }
 382
 383         DEBUG(10, ("Check auth for: [%s]\n", user_info->mapped.account_name));
 384
 385         /*
 386          * Check that the requested domain is not our own machine name.
 387          * If it is, we should never check the PDC here, we use our own local
 388          * password file.
 389          */
 390
 391         if(strequal(get_global_sam_name(), user_info->mapped.domain_name)) {
 392                 DEBUG(3,("check_ntdomain_security: Requested domain was for this machine.\n"));
 393                 return NT_STATUS_NOT_IMPLEMENTED;
 394         }
 395
 396         /* we need our DC to send the net_sam_logon() request to */
 397
 398         if ( !get_dc_name(domain, NULL, dc_name, &dc_ss) ) {
 399                 DEBUG(5,("check_ntdomain_security: unable to locate a DC for domain %s\n",
 400                         user_info->mapped.domain_name));
 401                 return NT_STATUS_NO_LOGON_SERVERS;
 402         }
 403
 404         nt_status = domain_client_validate(mem_ctx,
 405                                         user_info,
 406                                         domain,
 407                                         (uchar *)auth_context->challenge.data,
 408                                         server_info,
 409                                         dc_name,
 410                                         &dc_ss);
 411
 412         return nt_status;
 413 }
 414
 415 /* module initialisation */
 416 static NTSTATUS auth_init_ntdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 417 {
 418         struct auth_methods *result;
 419
 420         result = TALLOC_ZERO_P(auth_context, struct auth_methods);
 421         if (result == NULL) {
 422                 return NT_STATUS_NO_MEMORY;
 423         }
 424         result->name = "ntdomain";
 425         result->auth = check_ntdomain_security;
 426
 427         *auth_method = result;
 428         return NT_STATUS_OK;
 429 }
 430
 431
 432 /****************************************************************************
 433  Check for a valid username and password in a trusted domain
 434 ****************************************************************************/
 435
 436 static NTSTATUS check_trustdomain_security(const struct auth_context *auth_context,
 437                                            void *my_private_data,
 438                                            TALLOC_CTX *mem_ctx,
 439                                            const struct auth_usersupplied_info *user_info,
 440                                            struct auth_serversupplied_info **server_info)
 441 {
 442         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 443         unsigned char trust_md4_password[16];
 444         char *trust_password;
 445         fstring dc_name;
 446         struct sockaddr_storage dc_ss;
 447
 448         if (!user_info || !server_info || !auth_context) {
 449                 DEBUG(1,("check_trustdomain_security: Critical variables not present.  Failing.\n"));
 450                 return NT_STATUS_INVALID_PARAMETER;
 451         }
 452
 453         DEBUG(10, ("Check auth for: [%s]\n", user_info->mapped.account_name));
 454
 455         /*
 456          * Check that the requested domain is not our own machine name or domain name.
 457          */
 458
 459         if( strequal(get_global_sam_name(), user_info->mapped.domain_name)) {
 460                 DEBUG(3,("check_trustdomain_security: Requested domain [%s] was for this machine.\n",
 461                         user_info->mapped.domain_name));
 462                 return NT_STATUS_NOT_IMPLEMENTED;
 463         }
 464
 465         /* No point is bothering if this is not a trusted domain.
 466            This return makes "map to guest = bad user" work again.
 467            The logic is that if we know nothing about the domain, that
 468            user is not known to us and does not exist */
 469
 470         if ( !is_trusted_domain( user_info->mapped.domain_name ) )
 471                 return NT_STATUS_NOT_IMPLEMENTED;
 472
 473         /*
 474          * Get the trusted account password for the trusted domain
 475          * No need to become_root() as secrets_init() is done at startup.
 476          */
 477
 478         if (!pdb_get_trusteddom_pw(user_info->mapped.domain_name, &trust_password,
 479                                    NULL, NULL)) {
 480                 DEBUG(0, ("check_trustdomain_security: could not fetch trust "
 481                           "account password for domain %s\n",
 482                           user_info->mapped.domain_name));
 483                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 484         }
 485
 486 #ifdef DEBUG_PASSWORD
 487         DEBUG(100, ("Trust password for domain %s is %s\n", user_info->mapped.domain_name,
 488                     trust_password));
 489 #endif
 490         E_md4hash(trust_password, trust_md4_password);
 491         SAFE_FREE(trust_password);
 492
 493 #if 0
 494         /* Test if machine password is expired and need to be changed */
 495         if (time(NULL) > last_change_time + (time_t)lp_machine_password_timeout())
 496         {
 497                 global_machine_password_needs_changing = True;
 498         }
 499 #endif
 500
 501         /* use get_dc_name() for consistency even through we know that it will be
 502            a netbios name */
 503
 504         if ( !get_dc_name(user_info->mapped.domain_name, NULL, dc_name, &dc_ss) ) {
 505                 DEBUG(5,("check_trustdomain_security: unable to locate a DC for domain %s\n",
 506                         user_info->mapped.domain_name));
 507                 return NT_STATUS_NO_LOGON_SERVERS;
 508         }
 509
 510         nt_status = domain_client_validate(mem_ctx,
 511                                            user_info,
 512                                            user_info->mapped.domain_name,
 513                                            (uchar *)auth_context->challenge.data,
 514                                            server_info,
 515                                            dc_name,
 516                                            &dc_ss);
 517
 518         return nt_status;
 519 }
 520
 521 /* module initialisation */
 522 static NTSTATUS auth_init_trustdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 523 {
 524         struct auth_methods *result;
 525
 526         result = TALLOC_ZERO_P(auth_context, struct auth_methods);
 527         if (result == NULL) {
 528                 return NT_STATUS_NO_MEMORY;
 529         }
 530         result->name = "trustdomain";
 531         result->auth = check_trustdomain_security;
 532
 533         *auth_method = result;
 534         return NT_STATUS_OK;
 535 }
 536
 537 NTSTATUS auth_domain_init(void)
 538 {
 539         smb_register_auth(AUTH_INTERFACE_VERSION, "trustdomain", auth_init_trustdomain);
 540         smb_register_auth(AUTH_INTERFACE_VERSION, "ntdomain", auth_init_ntdomain);
 541         return NT_STATUS_OK;
 542 }