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, const char *dc_name,
  45                                                   struct in_addr dc_ip,
  46                                                   const char *setup_creds_as,
  47                                                   uint16 sec_chan,
  48                                                   const unsigned char *trust_passwd,
  49                                                   BOOL *retry)
  50 {
  51         NTSTATUS result;
  52
  53         /* TODO: Send a SAMLOGON request to determine whether this is a valid
  54            logonserver.  We can avoid a 30-second timeout if the DC is down
  55            if the SAMLOGON request fails as it is only over UDP. */
  56
  57         /* we use a mutex to prevent two connections at once - when a
  58            Win2k PDC get two connections where one hasn't completed a
  59            session setup yet it will send a TCP reset to the first
  60            connection (tridge) */
  61
  62         /*
  63          * With NT4.x DC's *all* authentication must be serialized to avoid
  64          * ACCESS_DENIED errors if 2 auths are done from the same machine. JRA.
  65          */
  66
  67         if (!grab_server_mutex(dc_name))
  68                 return NT_STATUS_NO_LOGON_SERVERS;
  69
  70         /* Attempt connection */
  71         *retry = True;
  72         result = cli_full_connection(cli, global_myname(), dc_name, &dc_ip, 0,
  73                 "IPC$", "IPC", "", "", "", 0, Undefined, retry);
  74
  75         if (!NT_STATUS_IS_OK(result)) {
  76                 /* map to something more useful */
  77                 if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
  78                         result = NT_STATUS_NO_LOGON_SERVERS;
  79                 }
  80
  81                 release_server_mutex();
  82                 return result;
  83         }
  84
  85         /*
  86          * We now have an anonymous connection to IPC$ on the domain password server.
  87          */
  88
  89         /*
  90          * Even if the connect succeeds we need to setup the netlogon
  91          * pipe here. We do this as we may just have changed the domain
  92          * account password on the PDC and yet we may be talking to
  93          * a BDC that doesn't have this replicated yet. In this case
  94          * a successful connect to a DC needs to take the netlogon connect
  95          * into account also. This patch from "Bjart Kvarme" <bjart.kvarme@usit.uio.no>.
  96          */
  97
  98         if(cli_nt_session_open(*cli, PI_NETLOGON) == False) {
  99                 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
 100 machine %s. Error was : %s.\n", dc_name, cli_errstr(*cli)));
 101                 cli_nt_session_close(*cli);
 102                 cli_ulogoff(*cli);
 103                 cli_shutdown(*cli);
 104                 release_server_mutex();
 105                 return NT_STATUS_NO_LOGON_SERVERS;
 106         }
 107
 108         fstr_sprintf((*cli)->mach_acct, "%s$", setup_creds_as);
 109
 110         /* This must be the remote domain (not ours) for schannel */
 111
 112         fstrcpy( (*cli)->domain, domain );
 113
 114         result = cli_nt_establish_netlogon(*cli, sec_chan, trust_passwd);
 115
 116         if (!NT_STATUS_IS_OK(result)) {
 117                 DEBUG(0,("connect_to_domain_password_server: unable to setup the NETLOGON credentials to machine \
 118 %s. Error was : %s.\n", dc_name, nt_errstr(result)));
 119                 cli_nt_session_close(*cli);
 120                 cli_ulogoff(*cli);
 121                 cli_shutdown(*cli);
 122                 release_server_mutex();
 123                 return result;
 124         }
 125
 126         /* We exit here with the mutex *locked*. JRA */
 127
 128         return NT_STATUS_OK;
 129 }
 130
 131 /***********************************************************************
 132  Do the same as security=server, but using NT Domain calls and a session
 133  key from the machine password.  If the server parameter is specified
 134  use it, otherwise figure out a server from the 'password server' param.
 135 ************************************************************************/
 136
 137 static NTSTATUS domain_client_validate(TALLOC_CTX *mem_ctx,
 138                                        const auth_usersupplied_info *user_info,
 139                                        const char *domain,
 140                                        uchar chal[8],
 141                                        auth_serversupplied_info **server_info,
 142                                        const char *dc_name, struct in_addr dc_ip,
 143                                        const char *setup_creds_as,
 144                                        uint16 sec_chan,
 145                                        unsigned char trust_passwd[16],
 146                                        time_t last_change_time)
 147 {
 148         NET_USER_INFO_3 info3;
 149         struct cli_state *cli = NULL;
 150         NTSTATUS nt_status = NT_STATUS_NO_LOGON_SERVERS;
 151         int i;
 152         BOOL retry = True;
 153
 154         /*
 155          * At this point, smb_apasswd points to the lanman response to
 156          * the challenge in local_challenge, and smb_ntpasswd points to
 157          * the NT response to the challenge in local_challenge. Ship
 158          * these over the secure channel to a domain controller and
 159          * see if they were valid.
 160          */
 161
 162         /* rety loop for robustness */
 163
 164         for (i = 0; !NT_STATUS_IS_OK(nt_status) && retry && (i < 3); i++) {
 165                 nt_status = connect_to_domain_password_server(&cli, domain, dc_name,
 166                         dc_ip, setup_creds_as, sec_chan, trust_passwd, &retry);
 167         }
 168
 169         if ( !NT_STATUS_IS_OK(nt_status) ) {
 170                 DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
 171                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 172                         return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE;
 173                 }
 174                 return nt_status;
 175         }
 176
 177         ZERO_STRUCT(info3);
 178
 179         /*
 180          * If this call succeeds, we now have lots of info about the user
 181          * in the info3 structure.
 182          */
 183
 184         nt_status = cli_netlogon_sam_network_logon(cli, mem_ctx,
 185                 NULL, user_info->smb_name.str, user_info->domain.str,
 186                 user_info->wksta_name.str, chal, user_info->lm_resp,
 187                 user_info->nt_resp, &info3);
 188
 189         /* let go as soon as possible so we avoid any potential deadlocks
 190            with winbind lookup up users or groups */
 191
 192         release_server_mutex();
 193
 194         if (!NT_STATUS_IS_OK(nt_status)) {
 195                 DEBUG(0,("domain_client_validate: unable to validate password "
 196                          "for user %s in domain %s to Domain controller %s. "
 197                          "Error was %s.\n", user_info->smb_name.str,
 198                          user_info->domain.str, cli->srv_name_slash,
 199                          nt_errstr(nt_status)));
 200
 201                 /* map to something more useful */
 202                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 203                         nt_status = NT_STATUS_NO_LOGON_SERVERS;
 204                 }
 205         } else {
 206                 nt_status = make_server_info_info3(mem_ctx, user_info->internal_username.str,
 207                                                    user_info->smb_name.str, domain, server_info, &info3);
 208                 netsamlogon_cache_store( mem_ctx, user_info->smb_name.str, &info3 );
 209         }
 210
 211 #if 0
 212         /*
 213          * We don't actually need to do this - plus it fails currently with
 214          * NT_STATUS_INVALID_INFO_CLASS - we need to know *exactly* what to
 215          * send here. JRA.
 216          */
 217
 218         if (NT_STATUS_IS_OK(status)) {
 219                 if(cli_nt_logoff(&cli, &ctr) == False) {
 220                         DEBUG(0,("domain_client_validate: unable to log off user %s in domain \
 221 %s to Domain controller %s. Error was %s.\n", user, domain, dc_name, cli_errstr(&cli)));
 222                         nt_status = NT_STATUS_LOGON_FAILURE;
 223                 }
 224         }
 225 #endif /* 0 */
 226
 227         /* Note - once the cli stream is shutdown the mem_ctx used
 228            to allocate the other_sids and gids structures has been deleted - so
 229            these pointers are no longer valid..... */
 230
 231         cli_nt_session_close(cli);
 232         cli_ulogoff(cli);
 233         cli_shutdown(cli);
 234         return nt_status;
 235 }
 236
 237 /****************************************************************************
 238  Check for a valid username and password in security=domain mode.
 239 ****************************************************************************/
 240
 241 static NTSTATUS check_ntdomain_security(const struct auth_context *auth_context,
 242                                         void *my_private_data,
 243                                         TALLOC_CTX *mem_ctx,
 244                                         const auth_usersupplied_info *user_info,
 245                                         auth_serversupplied_info **server_info)
 246 {
 247         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 248         unsigned char trust_passwd[16];
 249         time_t last_change_time;
 250         const char *domain = lp_workgroup();
 251         uint32 sec_channel_type = 0;
 252         fstring dc_name;
 253         struct in_addr dc_ip;
 254
 255         if ( lp_server_role() != ROLE_DOMAIN_MEMBER ) {
 256                 DEBUG(0,("check_ntdomain_security: Configuration error!  Cannot use "
 257                         "ntdomain auth method when not a member of a domain.\n"));
 258                 return NT_STATUS_NOT_IMPLEMENTED;
 259         }
 260
 261         if (!user_info || !server_info || !auth_context) {
 262                 DEBUG(1,("check_ntdomain_security: Critical variables not present.  Failing.\n"));
 263                 return NT_STATUS_INVALID_PARAMETER;
 264         }
 265
 266         /*
 267          * Check that the requested domain is not our own machine name.
 268          * If it is, we should never check the PDC here, we use our own local
 269          * password file.
 270          */
 271
 272         if(strequal(get_global_sam_name(), user_info->domain.str)) {
 273                 DEBUG(3,("check_ntdomain_security: Requested domain was for this machine.\n"));
 274                 return NT_STATUS_NOT_IMPLEMENTED;
 275         }
 276
 277         /*
 278          * Get the machine account password for our primary domain
 279          * No need to become_root() as secrets_init() is done at startup.
 280          */
 281
 282         if (!secrets_fetch_trust_account_password(domain, trust_passwd, &last_change_time, &sec_channel_type))
 283         {
 284                 DEBUG(0, ("check_ntdomain_security: could not fetch trust account password for domain '%s'\n", domain));
 285                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 286         }
 287
 288         /* Test if machine password has expired and needs to be changed */
 289         if (lp_machine_password_timeout()) {
 290                 if (last_change_time > 0 &&
 291                     time(NULL) > (last_change_time +
 292                                   lp_machine_password_timeout())) {
 293                         global_machine_password_needs_changing = True;
 294                 }
 295         }
 296
 297         /* we need our DC to send the net_sam_logon() request to */
 298
 299         if ( !get_dc_name(domain, NULL, dc_name, &dc_ip) ) {
 300                 DEBUG(5,("check_ntdomain_security: unable to locate a DC for domain %s\n",
 301                         user_info->domain.str));
 302                 return NT_STATUS_NO_LOGON_SERVERS;
 303         }
 304
 305         nt_status = domain_client_validate(mem_ctx, user_info, domain,
 306                 (uchar *)auth_context->challenge.data, server_info, dc_name, dc_ip,
 307                 global_myname(), sec_channel_type,trust_passwd, last_change_time);
 308
 309         return nt_status;
 310 }
 311
 312 /* module initialisation */
 313 static NTSTATUS auth_init_ntdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 314 {
 315         if (!make_auth_methods(auth_context, auth_method)) {
 316                 return NT_STATUS_NO_MEMORY;
 317         }
 318
 319         (*auth_method)->name = "ntdomain";
 320         (*auth_method)->auth = check_ntdomain_security;
 321         return NT_STATUS_OK;
 322 }
 323
 324
 325 /****************************************************************************
 326  Check for a valid username and password in a trusted domain
 327 ****************************************************************************/
 328
 329 static NTSTATUS check_trustdomain_security(const struct auth_context *auth_context,
 330                                            void *my_private_data,
 331                                            TALLOC_CTX *mem_ctx,
 332                                            const auth_usersupplied_info *user_info,
 333                                            auth_serversupplied_info **server_info)
 334 {
 335         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 336         unsigned char trust_md4_password[16];
 337         char *trust_password;
 338         time_t last_change_time;
 339         DOM_SID sid;
 340         fstring dc_name;
 341         struct in_addr dc_ip;
 342
 343         if (!user_info || !server_info || !auth_context) {
 344                 DEBUG(1,("check_trustdomain_security: Critical variables not present.  Failing.\n"));
 345                 return NT_STATUS_INVALID_PARAMETER;
 346         }
 347
 348         /*
 349          * Check that the requested domain is not our own machine name or domain name.
 350          */
 351
 352         if( strequal(get_global_sam_name(), user_info->domain.str)) {
 353                 DEBUG(3,("check_trustdomain_security: Requested domain [%s] was for this machine.\n",
 354                         user_info->domain.str));
 355                 return NT_STATUS_NOT_IMPLEMENTED;
 356         }
 357
 358         /* No point is bothering if this is not a trusted domain.
 359            This return makes "map to guest = bad user" work again.
 360            The logic is that if we know nothing about the domain, that
 361            user is known to us and does not exist */
 362
 363         if ( !is_trusted_domain( user_info->domain.str ) )
 364                 return NT_STATUS_NOT_IMPLEMENTED;
 365
 366         /*
 367          * Get the trusted account password for the trusted domain
 368          * No need to become_root() as secrets_init() is done at startup.
 369          */
 370
 371         if (!secrets_fetch_trusted_domain_password(user_info->domain.str, &trust_password, &sid, &last_change_time))
 372         {
 373                 DEBUG(0, ("check_trustdomain_security: could not fetch trust account password for domain %s\n", user_info->domain.str));
 374                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 375         }
 376
 377 #ifdef DEBUG_PASSWORD
 378         DEBUG(100, ("Trust password for domain %s is %s\n", user_info->domain.str, trust_password));
 379 #endif
 380         E_md4hash(trust_password, trust_md4_password);
 381         SAFE_FREE(trust_password);
 382
 383 #if 0
 384         /* Test if machine password is expired and need to be changed */
 385         if (time(NULL) > last_change_time + lp_machine_password_timeout())
 386         {
 387                 global_machine_password_needs_changing = True;
 388         }
 389 #endif
 390
 391         /* use get_dc_name() for consistency even through we know that it will be
 392            a netbios name */
 393
 394         if ( !get_dc_name(user_info->domain.str, NULL, dc_name, &dc_ip) ) {
 395                 DEBUG(5,("check_trustdomain_security: unable to locate a DC for domain %s\n",
 396                         user_info->domain.str));
 397                 return NT_STATUS_NO_LOGON_SERVERS;
 398         }
 399
 400         nt_status = domain_client_validate(mem_ctx, user_info, user_info->domain.str,
 401                 (uchar *)auth_context->challenge.data, server_info, dc_name, dc_ip,
 402                 lp_workgroup(), SEC_CHAN_DOMAIN, trust_md4_password, last_change_time);
 403
 404         return nt_status;
 405 }
 406
 407 /* module initialisation */
 408 static NTSTATUS auth_init_trustdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 409 {
 410         if (!make_auth_methods(auth_context, auth_method)) {
 411                 return NT_STATUS_NO_MEMORY;
 412         }
 413
 414         (*auth_method)->name = "trustdomain";
 415         (*auth_method)->auth = check_trustdomain_security;
 416         return NT_STATUS_OK;
 417 }
 418
 419 NTSTATUS auth_domain_init(void)
 420 {
 421         smb_register_auth(AUTH_INTERFACE_VERSION, "trustdomain", auth_init_trustdomain);
 422         smb_register_auth(AUTH_INTERFACE_VERSION, "ntdomain", auth_init_ntdomain);
 423         return NT_STATUS_OK;
 424 }