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 2 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, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 #undef DBGC_CLASS
  25 #define DBGC_CLASS DBGC_AUTH
  26
  27 extern BOOL global_machine_password_needs_changing;
  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 in_addr dc_ip,
  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         if (!grab_server_mutex(dc_name)) {
  72                 return NT_STATUS_NO_LOGON_SERVERS;
  73         }
  74
  75         /* Attempt connection */
  76         *retry = True;
  77         result = cli_full_connection(cli, global_myname(), dc_name, &dc_ip, 0,
  78                 "IPC$", "IPC", "", "", "", 0, Undefined, retry);
  79
  80         if (!NT_STATUS_IS_OK(result)) {
  81                 /* map to something more useful */
  82                 if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
  83                         result = NT_STATUS_NO_LOGON_SERVERS;
  84                 }
  85
  86                 if (*cli) {
  87                         cli_shutdown(*cli);
  88                         *cli = NULL;
  89                 }
  90
  91                 release_server_mutex();
  92                 return result;
  93         }
  94
  95         /*
  96          * We now have an anonymous connection to IPC$ on the domain password server.
  97          */
  98
  99         /*
 100          * Even if the connect succeeds we need to setup the netlogon
 101          * pipe here. We do this as we may just have changed the domain
 102          * account password on the PDC and yet we may be talking to
 103          * a BDC that doesn't have this replicated yet. In this case
 104          * a successful connect to a DC needs to take the netlogon connect
 105          * into account also. This patch from "Bjart Kvarme" <bjart.kvarme@usit.uio.no>.
 106          */
 107
 108         /* open the netlogon pipe. */
 109         if (lp_client_schannel()) {
 110                 /* We also setup the creds chain in the open_schannel call. */
 111                 netlogon_pipe = cli_rpc_pipe_open_schannel(*cli, PI_NETLOGON,
 112                                         PIPE_AUTH_LEVEL_PRIVACY, domain, &result);
 113         } else {
 114                 netlogon_pipe = cli_rpc_pipe_open_noauth(*cli, PI_NETLOGON, &result);
 115         }
 116
 117         if(!netlogon_pipe) {
 118                 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
 119 machine %s. Error was : %s.\n", dc_name, nt_errstr(result)));
 120                 cli_shutdown(*cli);
 121                 *cli = NULL;
 122                 release_server_mutex();
 123                 return result;
 124         }
 125
 126         if (!lp_client_schannel()) {
 127                 /* We need to set up a creds chain on an unauthenticated netlogon pipe. */
 128                 uint32 neg_flags = NETLOGON_NEG_AUTH2_FLAGS;
 129                 uint32 sec_chan_type = 0;
 130                 unsigned char machine_pwd[16];
 131                 const char *account_name;
 132
 133                 if (!get_trust_pw_hash(domain, machine_pwd, &account_name,
 134                                        &sec_chan_type))
 135                 {
 136                         DEBUG(0, ("connect_to_domain_password_server: could not fetch "
 137                         "trust account password for domain '%s'\n",
 138                                 domain));
 139                         cli_shutdown(*cli);
 140                         *cli = NULL;
 141                         release_server_mutex();
 142                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 143                 }
 144
 145                 result = rpccli_netlogon_setup_creds(netlogon_pipe,
 146                                         dc_name, /* server name */
 147                                         domain, /* domain */
 148                                         global_myname(), /* client name */
 149                                         account_name, /* machine account name */
 150                                         machine_pwd,
 151                                         sec_chan_type,
 152                                         &neg_flags);
 153
 154                 if (!NT_STATUS_IS_OK(result)) {
 155                         cli_shutdown(*cli);
 156                         *cli = NULL;
 157                         release_server_mutex();
 158                         return result;
 159                 }
 160         }
 161
 162         if(!netlogon_pipe) {
 163                 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
 164 machine %s. Error was : %s.\n", dc_name, cli_errstr(*cli)));
 165                 cli_shutdown(*cli);
 166                 *cli = NULL;
 167                 release_server_mutex();
 168                 return NT_STATUS_NO_LOGON_SERVERS;
 169         }
 170
 171         /* We exit here with the mutex *locked*. JRA */
 172
 173         *pipe_ret = netlogon_pipe;
 174
 175         return NT_STATUS_OK;
 176 }
 177
 178 /***********************************************************************
 179  Do the same as security=server, but using NT Domain calls and a session
 180  key from the machine password.  If the server parameter is specified
 181  use it, otherwise figure out a server from the 'password server' param.
 182 ************************************************************************/
 183
 184 static NTSTATUS domain_client_validate(TALLOC_CTX *mem_ctx,
 185                                         const auth_usersupplied_info *user_info,
 186                                         const char *domain,
 187                                         uchar chal[8],
 188                                         auth_serversupplied_info **server_info,
 189                                         const char *dc_name,
 190                                         struct in_addr dc_ip)
 191
 192 {
 193         NET_USER_INFO_3 info3;
 194         struct cli_state *cli = NULL;
 195         struct rpc_pipe_client *netlogon_pipe = NULL;
 196         NTSTATUS nt_status = NT_STATUS_NO_LOGON_SERVERS;
 197         int i;
 198         BOOL retry = True;
 199
 200         /*
 201          * At this point, smb_apasswd points to the lanman response to
 202          * the challenge in local_challenge, and smb_ntpasswd points to
 203          * the NT response to the challenge in local_challenge. Ship
 204          * these over the secure channel to a domain controller and
 205          * see if they were valid.
 206          */
 207
 208         /* rety loop for robustness */
 209
 210         for (i = 0; !NT_STATUS_IS_OK(nt_status) && retry && (i < 3); i++) {
 211                 nt_status = connect_to_domain_password_server(&cli,
 212                                                         domain,
 213                                                         dc_name,
 214                                                         dc_ip,
 215                                                         &netlogon_pipe,
 216                                                         &retry);
 217         }
 218
 219         if ( !NT_STATUS_IS_OK(nt_status) ) {
 220                 DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
 221                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 222                         return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE;
 223                 }
 224                 return nt_status;
 225         }
 226
 227         /* store a successful connection */
 228
 229         saf_store( domain, cli->desthost );
 230
 231         ZERO_STRUCT(info3);
 232
 233         /*
 234          * If this call succeeds, we now have lots of info about the user
 235          * in the info3 structure.
 236          */
 237
 238         nt_status = rpccli_netlogon_sam_network_logon(netlogon_pipe,
 239                                                       mem_ctx,
 240                                                       user_info->logon_parameters,/* flags such as 'allow workstation logon' */
 241                                                       dc_name,                    /* server name */
 242                                                       user_info->smb_name,        /* user name logging on. */
 243                                                       user_info->client_domain,   /* domain name */
 244                                                       user_info->wksta_name,      /* workstation name */
 245                                                       chal,                       /* 8 byte challenge. */
 246                                                       user_info->lm_resp,         /* lanman 24 byte response */
 247                                                       user_info->nt_resp,         /* nt 24 byte response */
 248                                                       &info3);                    /* info3 out */
 249
 250         /* Let go as soon as possible so we avoid any potential deadlocks
 251            with winbind lookup up users or groups. */
 252
 253         release_server_mutex();
 254
 255         if (!NT_STATUS_IS_OK(nt_status)) {
 256                 DEBUG(0,("domain_client_validate: unable to validate password "
 257                          "for user %s in domain %s to Domain controller %s. "
 258                          "Error was %s.\n", user_info->smb_name,
 259                          user_info->domain, dc_name,
 260                          nt_errstr(nt_status)));
 261
 262                 /* map to something more useful */
 263                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 264                         nt_status = NT_STATUS_NO_LOGON_SERVERS;
 265                 }
 266         } else {
 267                 nt_status = make_server_info_info3(mem_ctx,
 268                                                 user_info->smb_name,
 269                                                 domain,
 270                                                 server_info,
 271                                                 &info3);
 272
 273                 if (NT_STATUS_IS_OK(nt_status)) {
 274                         (*server_info)->was_mapped |= user_info->was_mapped;
 275
 276                         if ( ! (*server_info)->guest) {
 277                                 /* if a real user check pam account restrictions */
 278                                 /* only really perfomed if "obey pam restriction" is true */
 279                                 nt_status = smb_pam_accountcheck((*server_info)->unix_name);
 280                                 if (  !NT_STATUS_IS_OK(nt_status)) {
 281                                         DEBUG(1, ("PAM account restriction prevents user login\n"));
 282                                         cli_shutdown(cli);
 283                                         return nt_status;
 284                                 }
 285                         }
 286                 }
 287
 288                 netsamlogon_cache_store( user_info->smb_name, &info3 );
 289         }
 290
 291         /* Note - once the cli stream is shutdown the mem_ctx used
 292            to allocate the other_sids and gids structures has been deleted - so
 293            these pointers are no longer valid..... */
 294
 295         cli_shutdown(cli);
 296         return nt_status;
 297 }
 298
 299 /****************************************************************************
 300  Check for a valid username and password in security=domain mode.
 301 ****************************************************************************/
 302
 303 static NTSTATUS check_ntdomain_security(const struct auth_context *auth_context,
 304                                         void *my_private_data,
 305                                         TALLOC_CTX *mem_ctx,
 306                                         const auth_usersupplied_info *user_info,
 307                                         auth_serversupplied_info **server_info)
 308 {
 309         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 310         const char *domain = lp_workgroup();
 311         fstring dc_name;
 312         struct in_addr dc_ip;
 313
 314         if ( lp_server_role() != ROLE_DOMAIN_MEMBER ) {
 315                 DEBUG(0,("check_ntdomain_security: Configuration error!  Cannot use "
 316                         "ntdomain auth method when not a member of a domain.\n"));
 317                 return NT_STATUS_NOT_IMPLEMENTED;
 318         }
 319
 320         if (!user_info || !server_info || !auth_context) {
 321                 DEBUG(1,("check_ntdomain_security: Critical variables not present.  Failing.\n"));
 322                 return NT_STATUS_INVALID_PARAMETER;
 323         }
 324
 325         /*
 326          * Check that the requested domain is not our own machine name.
 327          * If it is, we should never check the PDC here, we use our own local
 328          * password file.
 329          */
 330
 331         if(strequal(get_global_sam_name(), user_info->domain)) {
 332                 DEBUG(3,("check_ntdomain_security: Requested domain was for this machine.\n"));
 333                 return NT_STATUS_NOT_IMPLEMENTED;
 334         }
 335
 336         /* we need our DC to send the net_sam_logon() request to */
 337
 338         if ( !get_dc_name(domain, NULL, dc_name, &dc_ip) ) {
 339                 DEBUG(5,("check_ntdomain_security: unable to locate a DC for domain %s\n",
 340                         user_info->domain));
 341                 return NT_STATUS_NO_LOGON_SERVERS;
 342         }
 343
 344         nt_status = domain_client_validate(mem_ctx,
 345                                         user_info,
 346                                         domain,
 347                                         (uchar *)auth_context->challenge.data,
 348                                         server_info,
 349                                         dc_name,
 350                                         dc_ip);
 351
 352         return nt_status;
 353 }
 354
 355 /* module initialisation */
 356 static NTSTATUS auth_init_ntdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 357 {
 358         if (!make_auth_methods(auth_context, auth_method)) {
 359                 return NT_STATUS_NO_MEMORY;
 360         }
 361
 362         (*auth_method)->name = "ntdomain";
 363         (*auth_method)->auth = check_ntdomain_security;
 364         return NT_STATUS_OK;
 365 }
 366
 367
 368 /****************************************************************************
 369  Check for a valid username and password in a trusted domain
 370 ****************************************************************************/
 371
 372 static NTSTATUS check_trustdomain_security(const struct auth_context *auth_context,
 373                                            void *my_private_data,
 374                                            TALLOC_CTX *mem_ctx,
 375                                            const auth_usersupplied_info *user_info,
 376                                            auth_serversupplied_info **server_info)
 377 {
 378         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 379         unsigned char trust_md4_password[16];
 380         char *trust_password;
 381         time_t last_change_time;
 382         DOM_SID sid;
 383         fstring dc_name;
 384         struct in_addr dc_ip;
 385
 386         if (!user_info || !server_info || !auth_context) {
 387                 DEBUG(1,("check_trustdomain_security: Critical variables not present.  Failing.\n"));
 388                 return NT_STATUS_INVALID_PARAMETER;
 389         }
 390
 391         /*
 392          * Check that the requested domain is not our own machine name or domain name.
 393          */
 394
 395         if( strequal(get_global_sam_name(), user_info->domain)) {
 396                 DEBUG(3,("check_trustdomain_security: Requested domain [%s] was for this machine.\n",
 397                         user_info->domain));
 398                 return NT_STATUS_NOT_IMPLEMENTED;
 399         }
 400
 401         /* No point is bothering if this is not a trusted domain.
 402            This return makes "map to guest = bad user" work again.
 403            The logic is that if we know nothing about the domain, that
 404            user is not known to us and does not exist */
 405
 406         if ( !is_trusted_domain( user_info->domain ) )
 407                 return NT_STATUS_NOT_IMPLEMENTED;
 408
 409         /*
 410          * Get the trusted account password for the trusted domain
 411          * No need to become_root() as secrets_init() is done at startup.
 412          */
 413
 414         if (!secrets_fetch_trusted_domain_password(user_info->domain, &trust_password,
 415                                 &sid, &last_change_time)) {
 416                 DEBUG(0, ("check_trustdomain_security: could not fetch trust "
 417                           "account password for domain %s\n",
 418                           user_info->domain));
 419                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 420         }
 421
 422 #ifdef DEBUG_PASSWORD
 423         DEBUG(100, ("Trust password for domain %s is %s\n", user_info->domain,
 424                     trust_password));
 425 #endif
 426         E_md4hash(trust_password, trust_md4_password);
 427         SAFE_FREE(trust_password);
 428
 429 #if 0
 430         /* Test if machine password is expired and need to be changed */
 431         if (time(NULL) > last_change_time + (time_t)lp_machine_password_timeout())
 432         {
 433                 global_machine_password_needs_changing = True;
 434         }
 435 #endif
 436
 437         /* use get_dc_name() for consistency even through we know that it will be
 438            a netbios name */
 439
 440         if ( !get_dc_name(user_info->domain, NULL, dc_name, &dc_ip) ) {
 441                 DEBUG(5,("check_trustdomain_security: unable to locate a DC for domain %s\n",
 442                         user_info->domain));
 443                 return NT_STATUS_NO_LOGON_SERVERS;
 444         }
 445
 446         nt_status = domain_client_validate(mem_ctx,
 447                                         user_info,
 448                                         user_info->domain,
 449                                         (uchar *)auth_context->challenge.data,
 450                                         server_info,
 451                                         dc_name,
 452                                         dc_ip);
 453
 454         return nt_status;
 455 }
 456
 457 /* module initialisation */
 458 static NTSTATUS auth_init_trustdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 459 {
 460         if (!make_auth_methods(auth_context, auth_method)) {
 461                 return NT_STATUS_NO_MEMORY;
 462         }
 463
 464         (*auth_method)->name = "trustdomain";
 465         (*auth_method)->auth = check_trustdomain_security;
 466         return NT_STATUS_OK;
 467 }
 468
 469 NTSTATUS auth_domain_init(void)
 470 {
 471         smb_register_auth(AUTH_INTERFACE_VERSION, "trustdomain", auth_init_trustdomain);
 472         smb_register_auth(AUTH_INTERFACE_VERSION, "ntdomain", auth_init_ntdomain);
 473         return NT_STATUS_OK;
 474 }