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         }
 209
 210 #if 0
 211         /*
 212          * We don't actually need to do this - plus it fails currently with
 213          * NT_STATUS_INVALID_INFO_CLASS - we need to know *exactly* what to
 214          * send here. JRA.
 215          */
 216
 217         if (NT_STATUS_IS_OK(status)) {
 218                 if(cli_nt_logoff(&cli, &ctr) == False) {
 219                         DEBUG(0,("domain_client_validate: unable to log off user %s in domain \
 220 %s to Domain controller %s. Error was %s.\n", user, domain, dc_name, cli_errstr(&cli)));
 221                         nt_status = NT_STATUS_LOGON_FAILURE;
 222                 }
 223         }
 224 #endif /* 0 */
 225
 226         /* Note - once the cli stream is shutdown the mem_ctx used
 227            to allocate the other_sids and gids structures has been deleted - so
 228            these pointers are no longer valid..... */
 229
 230         cli_nt_session_close(cli);
 231         cli_ulogoff(cli);
 232         cli_shutdown(cli);
 233         return nt_status;
 234 }
 235
 236 /****************************************************************************
 237  Check for a valid username and password in security=domain mode.
 238 ****************************************************************************/
 239
 240 static NTSTATUS check_ntdomain_security(const struct auth_context *auth_context,
 241                                         void *my_private_data,
 242                                         TALLOC_CTX *mem_ctx,
 243                                         const auth_usersupplied_info *user_info,
 244                                         auth_serversupplied_info **server_info)
 245 {
 246         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 247         unsigned char trust_passwd[16];
 248         time_t last_change_time;
 249         const char *domain = lp_workgroup();
 250         uint32 sec_channel_type = 0;
 251         fstring dc_name;
 252         struct in_addr dc_ip;
 253
 254         if ( lp_server_role() != ROLE_DOMAIN_MEMBER ) {
 255                 DEBUG(0,("check_ntdomain_security: Configuration error!  Cannot use "
 256                         "ntdomain auth method when not a member of a domain.\n"));
 257                 return NT_STATUS_NOT_IMPLEMENTED;
 258         }
 259
 260         if (!user_info || !server_info || !auth_context) {
 261                 DEBUG(1,("check_ntdomain_security: Critical variables not present.  Failing.\n"));
 262                 return NT_STATUS_INVALID_PARAMETER;
 263         }
 264
 265         /*
 266          * Check that the requested domain is not our own machine name.
 267          * If it is, we should never check the PDC here, we use our own local
 268          * password file.
 269          */
 270
 271         if(strequal(get_global_sam_name(), user_info->domain.str)) {
 272                 DEBUG(3,("check_ntdomain_security: Requested domain was for this machine.\n"));
 273                 return NT_STATUS_NOT_IMPLEMENTED;
 274         }
 275
 276         /*
 277          * Get the machine account password for our primary domain
 278          * No need to become_root() as secrets_init() is done at startup.
 279          */
 280
 281         if (!secrets_fetch_trust_account_password(domain, trust_passwd, &last_change_time, &sec_channel_type))
 282         {
 283                 DEBUG(0, ("check_ntdomain_security: could not fetch trust account password for domain '%s'\n", domain));
 284                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 285         }
 286
 287         /* Test if machine password has expired and needs to be changed */
 288         if (lp_machine_password_timeout()) {
 289                 if (last_change_time > 0 &&
 290                     time(NULL) > (last_change_time +
 291                                   lp_machine_password_timeout())) {
 292                         global_machine_password_needs_changing = True;
 293                 }
 294         }
 295
 296         /* we need our DC to send the net_sam_logon() request to */
 297
 298         if ( !get_dc_name(domain, NULL, dc_name, &dc_ip) ) {
 299                 DEBUG(5,("check_ntdomain_security: unable to locate a DC for domain %s\n",
 300                         user_info->domain.str));
 301                 return NT_STATUS_NO_LOGON_SERVERS;
 302         }
 303
 304         nt_status = domain_client_validate(mem_ctx, user_info, domain,
 305                 (uchar *)auth_context->challenge.data, server_info, dc_name, dc_ip,
 306                 global_myname(), sec_channel_type,trust_passwd, last_change_time);
 307
 308         return nt_status;
 309 }
 310
 311 /* module initialisation */
 312 static NTSTATUS auth_init_ntdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 313 {
 314         if (!make_auth_methods(auth_context, auth_method)) {
 315                 return NT_STATUS_NO_MEMORY;
 316         }
 317
 318         (*auth_method)->name = "ntdomain";
 319         (*auth_method)->auth = check_ntdomain_security;
 320         return NT_STATUS_OK;
 321 }
 322
 323
 324 /****************************************************************************
 325  Check for a valid username and password in a trusted domain
 326 ****************************************************************************/
 327
 328 static NTSTATUS check_trustdomain_security(const struct auth_context *auth_context,
 329                                            void *my_private_data,
 330                                            TALLOC_CTX *mem_ctx,
 331                                            const auth_usersupplied_info *user_info,
 332                                            auth_serversupplied_info **server_info)
 333 {
 334         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 335         unsigned char trust_md4_password[16];
 336         char *trust_password;
 337         time_t last_change_time;
 338         DOM_SID sid;
 339         fstring dc_name;
 340         struct in_addr dc_ip;
 341
 342         if (!user_info || !server_info || !auth_context) {
 343                 DEBUG(1,("check_trustdomain_security: Critical variables not present.  Failing.\n"));
 344                 return NT_STATUS_INVALID_PARAMETER;
 345         }
 346
 347         /*
 348          * Check that the requested domain is not our own machine name or domain name.
 349          */
 350
 351         if( strequal(get_global_sam_name(), user_info->domain.str)) {
 352                 DEBUG(3,("check_trustdomain_security: Requested domain [%s] was for this machine.\n",
 353                         user_info->domain.str));
 354                 return NT_STATUS_NOT_IMPLEMENTED;
 355         }
 356
 357         /* No point is bothering if this is not a trusted domain.
 358            This return makes "map to guest = bad user" work again.
 359            The logic is that if we know nothing about the domain, that
 360            user is known to us and does not exist */
 361
 362         if ( !is_trusted_domain( user_info->domain.str ) )
 363                 return NT_STATUS_NOT_IMPLEMENTED;
 364
 365         /*
 366          * Get the trusted account password for the trusted domain
 367          * No need to become_root() as secrets_init() is done at startup.
 368          */
 369
 370         if (!secrets_fetch_trusted_domain_password(user_info->domain.str, &trust_password, &sid, &last_change_time))
 371         {
 372                 DEBUG(0, ("check_trustdomain_security: could not fetch trust account password for domain %s\n", user_info->domain.str));
 373                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 374         }
 375
 376 #ifdef DEBUG_PASSWORD
 377         DEBUG(100, ("Trust password for domain %s is %s\n", user_info->domain.str, trust_password));
 378 #endif
 379         E_md4hash(trust_password, trust_md4_password);
 380         SAFE_FREE(trust_password);
 381
 382 #if 0
 383         /* Test if machine password is expired and need to be changed */
 384         if (time(NULL) > last_change_time + lp_machine_password_timeout())
 385         {
 386                 global_machine_password_needs_changing = True;
 387         }
 388 #endif
 389
 390         /* use get_dc_name() for consistency even through we know that it will be
 391            a netbios name */
 392
 393         if ( !get_dc_name(user_info->domain.str, NULL, dc_name, &dc_ip) ) {
 394                 DEBUG(5,("check_trustdomain_security: unable to locate a DC for domain %s\n",
 395                         user_info->domain.str));
 396                 return NT_STATUS_NO_LOGON_SERVERS;
 397         }
 398
 399         nt_status = domain_client_validate(mem_ctx, user_info, user_info->domain.str,
 400                 (uchar *)auth_context->challenge.data, server_info, dc_name, dc_ip,
 401                 lp_workgroup(), SEC_CHAN_DOMAIN, trust_md4_password, last_change_time);
 402
 403         return nt_status;
 404 }
 405
 406 /* module initialisation */
 407 static NTSTATUS auth_init_trustdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 408 {
 409         if (!make_auth_methods(auth_context, auth_method)) {
 410                 return NT_STATUS_NO_MEMORY;
 411         }
 412
 413         (*auth_method)->name = "trustdomain";
 414         (*auth_method)->auth = check_trustdomain_security;
 415         return NT_STATUS_OK;
 416 }
 417
 418 NTSTATUS auth_domain_init(void)
 419 {
 420         smb_register_auth(AUTH_INTERFACE_VERSION, "trustdomain", auth_init_trustdomain);
 421         smb_register_auth(AUTH_INTERFACE_VERSION, "ntdomain", auth_init_ntdomain);
 422         return NT_STATUS_OK;
 423 }