source/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 static struct named_mutex *mutex;
  28
  29 /**
  30  * Connect to a remote server for (inter)domain security authenticaion.
  31  *
  32  * @param cli the cli to return containing the active connection
  33  * @param server either a machine name or text IP address to
  34  *               connect to.
  35  * @param setup_creds_as domain account to setup credentials as
  36  * @param sec_chan a switch value to distinguish between domain
  37  *                 member and interdomain authentication
  38  * @param trust_passwd the trust password to establish the
  39  *                     credentials with.
  40  *
  41  **/
  42
  43 static NTSTATUS connect_to_domain_password_server(struct cli_state **cli,
  44                                                 const char *domain,
  45                                                 const char *dc_name,
  46                                                 struct sockaddr_storage *dc_ss,
  47                                                 struct rpc_pipe_client **pipe_ret,
  48                                                 bool *retry)
  49 {
  50         NTSTATUS result;
  51         struct rpc_pipe_client *netlogon_pipe = NULL;
  52
  53         *cli = NULL;
  54
  55         *pipe_ret = NULL;
  56
  57         /* TODO: Send a SAMLOGON request to determine whether this is a valid
  58            logonserver.  We can avoid a 30-second timeout if the DC is down
  59            if the SAMLOGON request fails as it is only over UDP. */
  60
  61         /* we use a mutex to prevent two connections at once - when a
  62            Win2k PDC get two connections where one hasn't completed a
  63            session setup yet it will send a TCP reset to the first
  64            connection (tridge) */
  65
  66         /*
  67          * With NT4.x DC's *all* authentication must be serialized to avoid
  68          * ACCESS_DENIED errors if 2 auths are done from the same machine. JRA.
  69          */
  70
  71         mutex = grab_named_mutex(NULL, dc_name, 10);
  72         if (mutex == NULL) {
  73                 return NT_STATUS_NO_LOGON_SERVERS;
  74         }
  75
  76         /* Attempt connection */
  77         *retry = True;
  78         result = cli_full_connection(cli, global_myname(), dc_name, dc_ss, 0,
  79                 "IPC$", "IPC", "", "", "", 0, Undefined, retry);
  80
  81         if (!NT_STATUS_IS_OK(result)) {
  82                 /* map to something more useful */
  83                 if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
  84                         result = NT_STATUS_NO_LOGON_SERVERS;
  85                 }
  86
  87                 if (*cli) {
  88                         cli_shutdown(*cli);
  89                         *cli = NULL;
  90                 }
  91
  92                 TALLOC_FREE(mutex);
  93                 return result;
  94         }
  95
  96         /*
  97          * We now have an anonymous connection to IPC$ on the domain password server.
  98          */
  99
 100         /*
 101          * Even if the connect succeeds we need to setup the netlogon
 102          * pipe here. We do this as we may just have changed the domain
 103          * account password on the PDC and yet we may be talking to
 104          * a BDC that doesn't have this replicated yet. In this case
 105          * a successful connect to a DC needs to take the netlogon connect
 106          * into account also. This patch from "Bjart Kvarme" <bjart.kvarme@usit.uio.no>.
 107          */
 108
 109         /* open the netlogon pipe. */
 110         if (lp_client_schannel()) {
 111                 /* We also setup the creds chain in the open_schannel call. */
 112                 result = cli_rpc_pipe_open_schannel(
 113                         *cli, &ndr_table_netlogon.syntax_id,
 114                         PIPE_AUTH_LEVEL_PRIVACY, domain, &netlogon_pipe);
 115         } else {
 116                 result = cli_rpc_pipe_open_noauth(
 117                         *cli, &ndr_table_netlogon.syntax_id, &netlogon_pipe);
 118         }
 119
 120         if (!NT_STATUS_IS_OK(result)) {
 121                 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
 122 machine %s. Error was : %s.\n", dc_name, nt_errstr(result)));
 123                 cli_shutdown(*cli);
 124                 *cli = NULL;
 125                 TALLOC_FREE(mutex);
 126                 return result;
 127         }
 128
 129         if (!lp_client_schannel()) {
 130                 /* We need to set up a creds chain on an unauthenticated netlogon pipe. */
 131                 uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
 132                 uint32 sec_chan_type = 0;
 133                 unsigned char machine_pwd[16];
 134                 const char *account_name;
 135
 136                 if (!get_trust_pw_hash(domain, machine_pwd, &account_name,
 137                                        &sec_chan_type))
 138                 {
 139                         DEBUG(0, ("connect_to_domain_password_server: could not fetch "
 140                         "trust account password for domain '%s'\n",
 141                                 domain));
 142                         cli_shutdown(*cli);
 143                         *cli = NULL;
 144                         TALLOC_FREE(mutex);
 145                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 146                 }
 147
 148                 result = rpccli_netlogon_setup_creds(netlogon_pipe,
 149                                         dc_name, /* server name */
 150                                         domain, /* domain */
 151                                         global_myname(), /* client name */
 152                                         account_name, /* machine account name */
 153                                         machine_pwd,
 154                                         sec_chan_type,
 155                                         &neg_flags);
 156
 157                 if (!NT_STATUS_IS_OK(result)) {
 158                         cli_shutdown(*cli);
 159                         *cli = NULL;
 160                         TALLOC_FREE(mutex);
 161                         return result;
 162                 }
 163         }
 164
 165         if(!netlogon_pipe) {
 166                 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
 167 machine %s. Error was : %s.\n", dc_name, cli_errstr(*cli)));
 168                 cli_shutdown(*cli);
 169                 *cli = NULL;
 170                 TALLOC_FREE(mutex);
 171                 return NT_STATUS_NO_LOGON_SERVERS;
 172         }
 173
 174         /* We exit here with the mutex *locked*. JRA */
 175
 176         *pipe_ret = netlogon_pipe;
 177
 178         return NT_STATUS_OK;
 179 }
 180
 181 /***********************************************************************
 182  Do the same as security=server, but using NT Domain calls and a session
 183  key from the machine password.  If the server parameter is specified
 184  use it, otherwise figure out a server from the 'password server' param.
 185 ************************************************************************/
 186
 187 static NTSTATUS domain_client_validate(TALLOC_CTX *mem_ctx,
 188                                         const auth_usersupplied_info *user_info,
 189                                         const char *domain,
 190                                         uchar chal[8],
 191                                         auth_serversupplied_info **server_info,
 192                                         const char *dc_name,
 193                                         struct sockaddr_storage *dc_ss)
 194
 195 {
 196         struct netr_SamInfo3 *info3 = NULL;
 197         struct cli_state *cli = NULL;
 198         struct rpc_pipe_client *netlogon_pipe = NULL;
 199         NTSTATUS nt_status = NT_STATUS_NO_LOGON_SERVERS;
 200         int i;
 201         bool retry = True;
 202
 203         /*
 204          * At this point, smb_apasswd points to the lanman response to
 205          * the challenge in local_challenge, and smb_ntpasswd points to
 206          * the NT response to the challenge in local_challenge. Ship
 207          * these over the secure channel to a domain controller and
 208          * see if they were valid.
 209          */
 210
 211         /* rety loop for robustness */
 212
 213         for (i = 0; !NT_STATUS_IS_OK(nt_status) && retry && (i < 3); i++) {
 214                 nt_status = connect_to_domain_password_server(&cli,
 215                                                         domain,
 216                                                         dc_name,
 217                                                         dc_ss,
 218                                                         &netlogon_pipe,
 219                                                         &retry);
 220         }
 221
 222         if ( !NT_STATUS_IS_OK(nt_status) ) {
 223                 DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
 224                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 225                         return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE;
 226                 }
 227                 return nt_status;
 228         }
 229
 230         /* store a successful connection */
 231
 232         saf_store( domain, cli->desthost );
 233
 234         /*
 235          * If this call succeeds, we now have lots of info about the user
 236          * in the info3 structure.
 237          */
 238
 239         nt_status = rpccli_netlogon_sam_network_logon(netlogon_pipe,
 240                                                       mem_ctx,
 241                                                       user_info->logon_parameters,/* flags such as 'allow workstation logon' */
 242                                                       dc_name,                    /* server name */
 243                                                       user_info->smb_name,        /* user name logging on. */
 244                                                       user_info->client_domain,   /* domain name */
 245                                                       user_info->wksta_name,      /* workstation name */
 246                                                       chal,                       /* 8 byte challenge. */
 247                                                       user_info->lm_resp,         /* lanman 24 byte response */
 248                                                       user_info->nt_resp,         /* nt 24 byte response */
 249                                                       &info3);                    /* info3 out */
 250
 251         /* Let go as soon as possible so we avoid any potential deadlocks
 252            with winbind lookup up users or groups. */
 253
 254         TALLOC_FREE(mutex);
 255
 256         if (!NT_STATUS_IS_OK(nt_status)) {
 257                 DEBUG(0,("domain_client_validate: unable to validate password "
 258                          "for user %s in domain %s to Domain controller %s. "
 259                          "Error was %s.\n", user_info->smb_name,
 260                          user_info->client_domain, dc_name,
 261                          nt_errstr(nt_status)));
 262
 263                 /* map to something more useful */
 264                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 265                         nt_status = NT_STATUS_NO_LOGON_SERVERS;
 266                 }
 267         } else {
 268                 nt_status = make_server_info_info3(mem_ctx,
 269                                                 user_info->smb_name,
 270                                                 domain,
 271                                                 server_info,
 272                                                 info3);
 273
 274                 if (NT_STATUS_IS_OK(nt_status)) {
 275                         (*server_info)->nss_token |= user_info->was_mapped;
 276
 277                         if ( ! (*server_info)->guest) {
 278                                 /* if a real user check pam account restrictions */
 279                                 /* only really perfomed if "obey pam restriction" is true */
 280                                 nt_status = smb_pam_accountcheck((*server_info)->unix_name);
 281                                 if (  !NT_STATUS_IS_OK(nt_status)) {
 282                                         DEBUG(1, ("PAM account restriction prevents user login\n"));
 283                                         cli_shutdown(cli);
 284                                         TALLOC_FREE(info3);
 285                                         return nt_status;
 286                                 }
 287                         }
 288                 }
 289
 290                 netsamlogon_cache_store(user_info->smb_name, info3);
 291                 TALLOC_FREE(info3);
 292         }
 293
 294         /* Note - once the cli stream is shutdown the mem_ctx used
 295            to allocate the other_sids and gids structures has been deleted - so
 296            these pointers are no longer valid..... */
 297
 298         cli_shutdown(cli);
 299         return nt_status;
 300 }
 301
 302 /****************************************************************************
 303  Check for a valid username and password in security=domain mode.
 304 ****************************************************************************/
 305
 306 static NTSTATUS check_ntdomain_security(const struct auth_context *auth_context,
 307                                         void *my_private_data,
 308                                         TALLOC_CTX *mem_ctx,
 309                                         const auth_usersupplied_info *user_info,
 310                                         auth_serversupplied_info **server_info)
 311 {
 312         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 313         const char *domain = lp_workgroup();
 314         fstring dc_name;
 315         struct sockaddr_storage dc_ss;
 316
 317         if ( lp_server_role() != ROLE_DOMAIN_MEMBER ) {
 318                 DEBUG(0,("check_ntdomain_security: Configuration error!  Cannot use "
 319                         "ntdomain auth method when not a member of a domain.\n"));
 320                 return NT_STATUS_NOT_IMPLEMENTED;
 321         }
 322
 323         if (!user_info || !server_info || !auth_context) {
 324                 DEBUG(1,("check_ntdomain_security: Critical variables not present.  Failing.\n"));
 325                 return NT_STATUS_INVALID_PARAMETER;
 326         }
 327
 328         /*
 329          * Check that the requested domain is not our own machine name.
 330          * If it is, we should never check the PDC here, we use our own local
 331          * password file.
 332          */
 333
 334         if(strequal(get_global_sam_name(), user_info->domain)) {
 335                 DEBUG(3,("check_ntdomain_security: Requested domain was for this machine.\n"));
 336                 return NT_STATUS_NOT_IMPLEMENTED;
 337         }
 338
 339         /* we need our DC to send the net_sam_logon() request to */
 340
 341         if ( !get_dc_name(domain, NULL, dc_name, &dc_ss) ) {
 342                 DEBUG(5,("check_ntdomain_security: unable to locate a DC for domain %s\n",
 343                         user_info->domain));
 344                 return NT_STATUS_NO_LOGON_SERVERS;
 345         }
 346
 347         nt_status = domain_client_validate(mem_ctx,
 348                                         user_info,
 349                                         domain,
 350                                         (uchar *)auth_context->challenge.data,
 351                                         server_info,
 352                                         dc_name,
 353                                         &dc_ss);
 354
 355         return nt_status;
 356 }
 357
 358 /* module initialisation */
 359 static NTSTATUS auth_init_ntdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 360 {
 361         if (!make_auth_methods(auth_context, auth_method)) {
 362                 return NT_STATUS_NO_MEMORY;
 363         }
 364
 365         (*auth_method)->name = "ntdomain";
 366         (*auth_method)->auth = check_ntdomain_security;
 367         return NT_STATUS_OK;
 368 }
 369
 370
 371 /****************************************************************************
 372  Check for a valid username and password in a trusted domain
 373 ****************************************************************************/
 374
 375 static NTSTATUS check_trustdomain_security(const struct auth_context *auth_context,
 376                                            void *my_private_data,
 377                                            TALLOC_CTX *mem_ctx,
 378                                            const auth_usersupplied_info *user_info,
 379                                            auth_serversupplied_info **server_info)
 380 {
 381         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 382         unsigned char trust_md4_password[16];
 383         char *trust_password;
 384         time_t last_change_time;
 385         DOM_SID sid;
 386         fstring dc_name;
 387         struct sockaddr_storage dc_ss;
 388
 389         if (!user_info || !server_info || !auth_context) {
 390                 DEBUG(1,("check_trustdomain_security: Critical variables not present.  Failing.\n"));
 391                 return NT_STATUS_INVALID_PARAMETER;
 392         }
 393
 394         /*
 395          * Check that the requested domain is not our own machine name or domain name.
 396          */
 397
 398         if( strequal(get_global_sam_name(), user_info->domain)) {
 399                 DEBUG(3,("check_trustdomain_security: Requested domain [%s] was for this machine.\n",
 400                         user_info->domain));
 401                 return NT_STATUS_NOT_IMPLEMENTED;
 402         }
 403
 404         /* No point is bothering if this is not a trusted domain.
 405            This return makes "map to guest = bad user" work again.
 406            The logic is that if we know nothing about the domain, that
 407            user is not known to us and does not exist */
 408
 409         if ( !is_trusted_domain( user_info->domain ) )
 410                 return NT_STATUS_NOT_IMPLEMENTED;
 411
 412         /*
 413          * Get the trusted account password for the trusted domain
 414          * No need to become_root() as secrets_init() is done at startup.
 415          */
 416
 417         if (!pdb_get_trusteddom_pw(user_info->domain, &trust_password,
 418                                    &sid, &last_change_time)) {
 419                 DEBUG(0, ("check_trustdomain_security: could not fetch trust "
 420                           "account password for domain %s\n",
 421                           user_info->domain));
 422                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 423         }
 424
 425 #ifdef DEBUG_PASSWORD
 426         DEBUG(100, ("Trust password for domain %s is %s\n", user_info->domain,
 427                     trust_password));
 428 #endif
 429         E_md4hash(trust_password, trust_md4_password);
 430         SAFE_FREE(trust_password);
 431
 432 #if 0
 433         /* Test if machine password is expired and need to be changed */
 434         if (time(NULL) > last_change_time + (time_t)lp_machine_password_timeout())
 435         {
 436                 global_machine_password_needs_changing = True;
 437         }
 438 #endif
 439
 440         /* use get_dc_name() for consistency even through we know that it will be
 441            a netbios name */
 442
 443         if ( !get_dc_name(user_info->domain, NULL, dc_name, &dc_ss) ) {
 444                 DEBUG(5,("check_trustdomain_security: unable to locate a DC for domain %s\n",
 445                         user_info->domain));
 446                 return NT_STATUS_NO_LOGON_SERVERS;
 447         }
 448
 449         nt_status = domain_client_validate(mem_ctx,
 450                                         user_info,
 451                                         user_info->domain,
 452                                         (uchar *)auth_context->challenge.data,
 453                                         server_info,
 454                                         dc_name,
 455                                         &dc_ss);
 456
 457         return nt_status;
 458 }
 459
 460 /* module initialisation */
 461 static NTSTATUS auth_init_trustdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 462 {
 463         if (!make_auth_methods(auth_context, auth_method)) {
 464                 return NT_STATUS_NO_MEMORY;
 465         }
 466
 467         (*auth_method)->name = "trustdomain";
 468         (*auth_method)->auth = check_trustdomain_security;
 469         return NT_STATUS_OK;
 470 }
 471
 472 NTSTATUS auth_domain_init(void)
 473 {
 474         smb_register_auth(AUTH_INTERFACE_VERSION, "trustdomain", auth_init_trustdomain);
 475         smb_register_auth(AUTH_INTERFACE_VERSION, "ntdomain", auth_init_ntdomain);
 476         return NT_STATUS_OK;
 477 }