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