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
  23 #undef DBGC_CLASS
  24 #define DBGC_CLASS DBGC_AUTH
  25
  26 extern bool global_machine_password_needs_changing;
  27
  28 /**
  29  * Connect to a remote server for (inter)domain security authenticaion.
  30  *
  31  * @param cli the cli to return containing the active connection
  32  * @param server either a machine name or text IP address to
  33  *               connect to.
  34  * @param setup_creds_as domain account to setup credentials as
  35  * @param sec_chan a switch value to distinguish between domain
  36  *                 member and interdomain authentication
  37  * @param trust_passwd the trust password to establish the
  38  *                     credentials with.
  39  *
  40  **/
  41
  42 static NTSTATUS connect_to_domain_password_server(struct cli_state **cli,
  43                                                 const char *domain,
  44                                                 const char *dc_name,
  45                                                 struct sockaddr_storage *dc_ss,
  46                                                 struct rpc_pipe_client **pipe_ret,
  47                                                 bool *retry)
  48 {
  49         NTSTATUS result;
  50         struct rpc_pipe_client *netlogon_pipe = NULL;
  51
  52         *cli = NULL;
  53
  54         *pipe_ret = NULL;
  55
  56         /* TODO: Send a SAMLOGON request to determine whether this is a valid
  57            logonserver.  We can avoid a 30-second timeout if the DC is down
  58            if the SAMLOGON request fails as it is only over UDP. */
  59
  60         /* we use a mutex to prevent two connections at once - when a
  61            Win2k PDC get two connections where one hasn't completed a
  62            session setup yet it will send a TCP reset to the first
  63            connection (tridge) */
  64
  65         /*
  66          * With NT4.x DC's *all* authentication must be serialized to avoid
  67          * ACCESS_DENIED errors if 2 auths are done from the same machine. JRA.
  68          */
  69
  70         if (!grab_server_mutex(dc_name)) {
  71                 return NT_STATUS_NO_LOGON_SERVERS;
  72         }
  73
  74         /* Attempt connection */
  75         *retry = True;
  76         result = cli_full_connection(cli, global_myname(), dc_name, dc_ss, 0,
  77                 "IPC$", "IPC", "", "", "", 0, Undefined, retry);
  78
  79         if (!NT_STATUS_IS_OK(result)) {
  80                 /* map to something more useful */
  81                 if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
  82                         result = NT_STATUS_NO_LOGON_SERVERS;
  83                 }
  84
  85                 if (*cli) {
  86                         cli_shutdown(*cli);
  87                         *cli = NULL;
  88                 }
  89
  90                 release_server_mutex();
  91                 return result;
  92         }
  93
  94         /*
  95          * We now have an anonymous connection to IPC$ on the domain password server.
  96          */
  97
  98         /*
  99          * Even if the connect succeeds we need to setup the netlogon
 100          * pipe here. We do this as we may just have changed the domain
 101          * account password on the PDC and yet we may be talking to
 102          * a BDC that doesn't have this replicated yet. In this case
 103          * a successful connect to a DC needs to take the netlogon connect
 104          * into account also. This patch from "Bjart Kvarme" <bjart.kvarme@usit.uio.no>.
 105          */
 106
 107         /* open the netlogon pipe. */
 108         if (lp_client_schannel()) {
 109                 /* We also setup the creds chain in the open_schannel call. */
 110                 netlogon_pipe = cli_rpc_pipe_open_schannel(*cli, PI_NETLOGON,
 111                                         PIPE_AUTH_LEVEL_PRIVACY, domain, &result);
 112         } else {
 113                 netlogon_pipe = cli_rpc_pipe_open_noauth(*cli, PI_NETLOGON, &result);
 114         }
 115
 116         if(!netlogon_pipe) {
 117                 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
 118 machine %s. Error was : %s.\n", dc_name, nt_errstr(result)));
 119                 cli_shutdown(*cli);
 120                 *cli = NULL;
 121                 release_server_mutex();
 122                 return result;
 123         }
 124
 125         if (!lp_client_schannel()) {
 126                 /* We need to set up a creds chain on an unauthenticated netlogon pipe. */
 127                 uint32 neg_flags = NETLOGON_NEG_SELECT_AUTH2_FLAGS;
 128                 uint32 sec_chan_type = 0;
 129                 unsigned char machine_pwd[16];
 130                 const char *account_name;
 131
 132                 if (!get_trust_pw_hash(domain, machine_pwd, &account_name,
 133                                        &sec_chan_type))
 134                 {
 135                         DEBUG(0, ("connect_to_domain_password_server: could not fetch "
 136                         "trust account password for domain '%s'\n",
 137                                 domain));
 138                         cli_shutdown(*cli);
 139                         *cli = NULL;
 140                         release_server_mutex();
 141                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 142                 }
 143
 144                 result = rpccli_netlogon_setup_creds(netlogon_pipe,
 145                                         dc_name, /* server name */
 146                                         domain, /* domain */
 147                                         global_myname(), /* client name */
 148                                         account_name, /* machine account name */
 149                                         machine_pwd,
 150                                         sec_chan_type,
 151                                         &neg_flags);
 152
 153                 if (!NT_STATUS_IS_OK(result)) {
 154                         cli_shutdown(*cli);
 155                         *cli = NULL;
 156                         release_server_mutex();
 157                         return result;
 158                 }
 159         }
 160
 161         if(!netlogon_pipe) {
 162                 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
 163 machine %s. Error was : %s.\n", dc_name, cli_errstr(*cli)));
 164                 cli_shutdown(*cli);
 165                 *cli = NULL;
 166                 release_server_mutex();
 167                 return NT_STATUS_NO_LOGON_SERVERS;
 168         }
 169
 170         /* We exit here with the mutex *locked*. JRA */
 171
 172         *pipe_ret = netlogon_pipe;
 173
 174         return NT_STATUS_OK;
 175 }
 176
 177 /***********************************************************************
 178  Do the same as security=server, but using NT Domain calls and a session
 179  key from the machine password.  If the server parameter is specified
 180  use it, otherwise figure out a server from the 'password server' param.
 181 ************************************************************************/
 182
 183 static NTSTATUS domain_client_validate(TALLOC_CTX *mem_ctx,
 184                                         const auth_usersupplied_info *user_info,
 185                                         const char *domain,
 186                                         uchar chal[8],
 187                                         auth_serversupplied_info **server_info,
 188                                         const char *dc_name,
 189                                         struct sockaddr_storage *dc_ss)
 190
 191 {
 192         struct netr_SamInfo3 *info3 = NULL;
 193         struct cli_state *cli = NULL;
 194         struct rpc_pipe_client *netlogon_pipe = NULL;
 195         NTSTATUS nt_status = NT_STATUS_NO_LOGON_SERVERS;
 196         int i;
 197         bool retry = True;
 198
 199         /*
 200          * At this point, smb_apasswd points to the lanman response to
 201          * the challenge in local_challenge, and smb_ntpasswd points to
 202          * the NT response to the challenge in local_challenge. Ship
 203          * these over the secure channel to a domain controller and
 204          * see if they were valid.
 205          */
 206
 207         /* rety loop for robustness */
 208
 209         for (i = 0; !NT_STATUS_IS_OK(nt_status) && retry && (i < 3); i++) {
 210                 nt_status = connect_to_domain_password_server(&cli,
 211                                                         domain,
 212                                                         dc_name,
 213                                                         dc_ss,
 214                                                         &netlogon_pipe,
 215                                                         &retry);
 216         }
 217
 218         if ( !NT_STATUS_IS_OK(nt_status) ) {
 219                 DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
 220                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 221                         return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE;
 222                 }
 223                 return nt_status;
 224         }
 225
 226         /* store a successful connection */
 227
 228         saf_store( domain, cli->desthost );
 229
 230         /*
 231          * If this call succeeds, we now have lots of info about the user
 232          * in the info3 structure.
 233          */
 234
 235         nt_status = rpccli_netlogon_sam_network_logon(netlogon_pipe,
 236                                                       mem_ctx,
 237                                                       user_info->logon_parameters,/* flags such as 'allow workstation logon' */
 238                                                       dc_name,                    /* server name */
 239                                                       user_info->smb_name,        /* user name logging on. */
 240                                                       user_info->client_domain,   /* domain name */
 241                                                       user_info->wksta_name,      /* workstation name */
 242                                                       chal,                       /* 8 byte challenge. */
 243                                                       user_info->lm_resp,         /* lanman 24 byte response */
 244                                                       user_info->nt_resp,         /* nt 24 byte response */
 245                                                       &info3);                    /* info3 out */
 246
 247         /* Let go as soon as possible so we avoid any potential deadlocks
 248            with winbind lookup up users or groups. */
 249
 250         release_server_mutex();
 251
 252         if (!NT_STATUS_IS_OK(nt_status)) {
 253                 DEBUG(0,("domain_client_validate: unable to validate password "
 254                          "for user %s in domain %s to Domain controller %s. "
 255                          "Error was %s.\n", user_info->smb_name,
 256                          user_info->domain, dc_name,
 257                          nt_errstr(nt_status)));
 258
 259                 /* map to something more useful */
 260                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 261                         nt_status = NT_STATUS_NO_LOGON_SERVERS;
 262                 }
 263         } else {
 264                 nt_status = make_server_info_info3(mem_ctx,
 265                                                 user_info->smb_name,
 266                                                 domain,
 267                                                 server_info,
 268                                                 info3);
 269
 270                 if (NT_STATUS_IS_OK(nt_status)) {
 271                         if (user_info->was_mapped) {
 272                                 (*server_info)->was_mapped = user_info->was_mapped;
 273                         }
 274
 275                         if ( ! (*server_info)->guest) {
 276                                 /* if a real user check pam account restrictions */
 277                                 /* only really perfomed if "obey pam restriction" is true */
 278                                 nt_status = smb_pam_accountcheck((*server_info)->unix_name);
 279                                 if (  !NT_STATUS_IS_OK(nt_status)) {
 280                                         DEBUG(1, ("PAM account restriction prevents user login\n"));
 281                                         cli_shutdown(cli);
 282                                         TALLOC_FREE(info3);
 283                                         return nt_status;
 284                                 }
 285                         }
 286                 }
 287
 288                 netsamlogon_cache_store(user_info->smb_name, info3);
 289                 TALLOC_FREE(info3);
 290         }
 291
 292         /* Note - once the cli stream is shutdown the mem_ctx used
 293            to allocate the other_sids and gids structures has been deleted - so
 294            these pointers are no longer valid..... */
 295
 296         cli_shutdown(cli);
 297         return nt_status;
 298 }
 299
 300 /****************************************************************************
 301  Check for a valid username and password in security=domain mode.
 302 ****************************************************************************/
 303
 304 static NTSTATUS check_ntdomain_security(const struct auth_context *auth_context,
 305                                         void *my_private_data,
 306                                         TALLOC_CTX *mem_ctx,
 307                                         const auth_usersupplied_info *user_info,
 308                                         auth_serversupplied_info **server_info)
 309 {
 310         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 311         const char *domain = lp_workgroup();
 312         fstring dc_name;
 313         struct sockaddr_storage dc_ss;
 314
 315         if ( lp_server_role() != ROLE_DOMAIN_MEMBER ) {
 316                 DEBUG(0,("check_ntdomain_security: Configuration error!  Cannot use "
 317                         "ntdomain auth method when not a member of a domain.\n"));
 318                 return NT_STATUS_NOT_IMPLEMENTED;
 319         }
 320
 321         if (!user_info || !server_info || !auth_context) {
 322                 DEBUG(1,("check_ntdomain_security: Critical variables not present.  Failing.\n"));
 323                 return NT_STATUS_INVALID_PARAMETER;
 324         }
 325
 326         /*
 327          * Check that the requested domain is not our own machine name.
 328          * If it is, we should never check the PDC here, we use our own local
 329          * password file.
 330          */
 331
 332         if(strequal(get_global_sam_name(), user_info->domain)) {
 333                 DEBUG(3,("check_ntdomain_security: Requested domain was for this machine.\n"));
 334                 return NT_STATUS_NOT_IMPLEMENTED;
 335         }
 336
 337         /* we need our DC to send the net_sam_logon() request to */
 338
 339         if ( !get_dc_name(domain, NULL, dc_name, &dc_ss) ) {
 340                 DEBUG(5,("check_ntdomain_security: unable to locate a DC for domain %s\n",
 341                         user_info->domain));
 342                 return NT_STATUS_NO_LOGON_SERVERS;
 343         }
 344
 345         nt_status = domain_client_validate(mem_ctx,
 346                                         user_info,
 347                                         domain,
 348                                         (uchar *)auth_context->challenge.data,
 349                                         server_info,
 350                                         dc_name,
 351                                         &dc_ss);
 352
 353         return nt_status;
 354 }
 355
 356 /* module initialisation */
 357 static NTSTATUS auth_init_ntdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 358 {
 359         if (!make_auth_methods(auth_context, auth_method)) {
 360                 return NT_STATUS_NO_MEMORY;
 361         }
 362
 363         (*auth_method)->name = "ntdomain";
 364         (*auth_method)->auth = check_ntdomain_security;
 365         return NT_STATUS_OK;
 366 }
 367
 368
 369 /****************************************************************************
 370  Check for a valid username and password in a trusted domain
 371 ****************************************************************************/
 372
 373 static NTSTATUS check_trustdomain_security(const struct auth_context *auth_context,
 374                                            void *my_private_data,
 375                                            TALLOC_CTX *mem_ctx,
 376                                            const auth_usersupplied_info *user_info,
 377                                            auth_serversupplied_info **server_info)
 378 {
 379         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 380         unsigned char trust_md4_password[16];
 381         char *trust_password;
 382         time_t last_change_time;
 383         DOM_SID sid;
 384         fstring dc_name;
 385         struct sockaddr_storage dc_ss;
 386
 387         if (!user_info || !server_info || !auth_context) {
 388                 DEBUG(1,("check_trustdomain_security: Critical variables not present.  Failing.\n"));
 389                 return NT_STATUS_INVALID_PARAMETER;
 390         }
 391
 392         /*
 393          * Check that the requested domain is not our own machine name or domain name.
 394          */
 395
 396         if( strequal(get_global_sam_name(), user_info->domain)) {
 397                 DEBUG(3,("check_trustdomain_security: Requested domain [%s] was for this machine.\n",
 398                         user_info->domain));
 399                 return NT_STATUS_NOT_IMPLEMENTED;
 400         }
 401
 402         /* No point is bothering if this is not a trusted domain.
 403            This return makes "map to guest = bad user" work again.
 404            The logic is that if we know nothing about the domain, that
 405            user is not known to us and does not exist */
 406
 407         if ( !is_trusted_domain( user_info->domain ) )
 408                 return NT_STATUS_NOT_IMPLEMENTED;
 409
 410         /*
 411          * Get the trusted account password for the trusted domain
 412          * No need to become_root() as secrets_init() is done at startup.
 413          */
 414
 415         if (!pdb_get_trusteddom_pw(user_info->domain, &trust_password,
 416                                    &sid, &last_change_time)) {
 417                 DEBUG(0, ("check_trustdomain_security: could not fetch trust "
 418                           "account password for domain %s\n",
 419                           user_info->domain));
 420                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 421         }
 422
 423 #ifdef DEBUG_PASSWORD
 424         DEBUG(100, ("Trust password for domain %s is %s\n", user_info->domain,
 425                     trust_password));
 426 #endif
 427         E_md4hash(trust_password, trust_md4_password);
 428         SAFE_FREE(trust_password);
 429
 430 #if 0
 431         /* Test if machine password is expired and need to be changed */
 432         if (time(NULL) > last_change_time + (time_t)lp_machine_password_timeout())
 433         {
 434                 global_machine_password_needs_changing = True;
 435         }
 436 #endif
 437
 438         /* use get_dc_name() for consistency even through we know that it will be
 439            a netbios name */
 440
 441         if ( !get_dc_name(user_info->domain, NULL, dc_name, &dc_ss) ) {
 442                 DEBUG(5,("check_trustdomain_security: unable to locate a DC for domain %s\n",
 443                         user_info->domain));
 444                 return NT_STATUS_NO_LOGON_SERVERS;
 445         }
 446
 447         nt_status = domain_client_validate(mem_ctx,
 448                                         user_info,
 449                                         user_info->domain,
 450                                         (uchar *)auth_context->challenge.data,
 451                                         server_info,
 452                                         dc_name,
 453                                         &dc_ss);
 454
 455         return nt_status;
 456 }
 457
 458 /* module initialisation */
 459 static NTSTATUS auth_init_trustdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 460 {
 461         if (!make_auth_methods(auth_context, auth_method)) {
 462                 return NT_STATUS_NO_MEMORY;
 463         }
 464
 465         (*auth_method)->name = "trustdomain";
 466         (*auth_method)->auth = check_trustdomain_security;
 467         return NT_STATUS_OK;
 468 }
 469
 470 NTSTATUS auth_domain_init(void)
 471 {
 472         smb_register_auth(AUTH_INTERFACE_VERSION, "trustdomain", auth_init_trustdomain);
 473         smb_register_auth(AUTH_INTERFACE_VERSION, "ntdomain", auth_init_ntdomain);
 474         return NT_STATUS_OK;
 475 }