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 #include "libcli/auth/netlogon_creds_cli.h"
  31 #include "libsmb/samlogon_cache.h"
  32
  33 #undef DBGC_CLASS
  34 #define DBGC_CLASS DBGC_AUTH
  35
  36 static struct named_mutex *mutex;
  37
  38 /**
  39  * Connect to a remote server for (inter)domain security authenticaion.
  40  *
  41  * @param cli the cli to return containing the active connection
  42  * @param server either a machine name or text IP address to
  43  *               connect to.
  44  * @param setup_creds_as domain account to setup credentials as
  45  * @param sec_chan a switch value to distinguish between domain
  46  *                 member and interdomain authentication
  47  * @param trust_passwd the trust password to establish the
  48  *                     credentials with.
  49  *
  50  **/
  51
  52 static NTSTATUS connect_to_domain_password_server(struct cli_state **cli_ret,
  53                                                 const char *domain,
  54                                                 const char *dc_name,
  55                                                 const struct sockaddr_storage *dc_ss,
  56                                                 struct rpc_pipe_client **pipe_ret,
  57                                                 TALLOC_CTX *mem_ctx,
  58                                                 struct netlogon_creds_cli_context **creds_ret)
  59 {
  60         TALLOC_CTX *frame = talloc_stackframe();
  61         struct messaging_context *msg_ctx = server_messaging_context();
  62         NTSTATUS result;
  63         struct cli_state *cli = NULL;
  64         struct rpc_pipe_client *netlogon_pipe = NULL;
  65         struct netlogon_creds_cli_context *netlogon_creds = NULL;
  66
  67         *cli_ret = NULL;
  68         *pipe_ret = NULL;
  69         *creds_ret = NULL;
  70
  71         /* TODO: Send a SAMLOGON request to determine whether this is a valid
  72            logonserver.  We can avoid a 30-second timeout if the DC is down
  73            if the SAMLOGON request fails as it is only over UDP. */
  74
  75         /* we use a mutex to prevent two connections at once - when a
  76            Win2k PDC get two connections where one hasn't completed a
  77            session setup yet it will send a TCP reset to the first
  78            connection (tridge) */
  79
  80         /*
  81          * With NT4.x DC's *all* authentication must be serialized to avoid
  82          * ACCESS_DENIED errors if 2 auths are done from the same machine. JRA.
  83          */
  84
  85         mutex = grab_named_mutex(NULL, dc_name, 10);
  86         if (mutex == NULL) {
  87                 TALLOC_FREE(frame);
  88                 return NT_STATUS_NO_LOGON_SERVERS;
  89         }
  90
  91         /* Attempt connection */
  92         result = cli_full_connection(&cli, lp_netbios_name(), dc_name, dc_ss, 0,
  93                 "IPC$", "IPC", "", "", "", 0, SMB_SIGNING_IPC_DEFAULT);
  94
  95         if (!NT_STATUS_IS_OK(result)) {
  96                 /* map to something more useful */
  97                 if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
  98                         result = NT_STATUS_NO_LOGON_SERVERS;
  99                 }
 100
 101                 TALLOC_FREE(mutex);
 102                 TALLOC_FREE(frame);
 103                 return result;
 104         }
 105
 106         /*
 107          * We now have an anonymous connection to IPC$ on the domain password server.
 108          */
 109
 110         result = cli_rpc_pipe_open_schannel(cli,
 111                                             msg_ctx,
 112                                             &ndr_table_netlogon,
 113                                             NCACN_NP,
 114                                             domain,
 115                                             &netlogon_pipe,
 116                                             frame,
 117                                             &netlogon_creds);
 118         if (!NT_STATUS_IS_OK(result)) {
 119                 DEBUG(0,("connect_to_domain_password_server: "
 120                          "unable to open the domain client session to "
 121                          "machine %s. Error was : %s.\n",
 122                          dc_name, nt_errstr(result)));
 123                 cli_shutdown(cli);
 124                 TALLOC_FREE(mutex);
 125                 TALLOC_FREE(frame);
 126                 return NT_STATUS_NO_LOGON_SERVERS;
 127         }
 128
 129         /* We exit here with the mutex *locked*. JRA */
 130
 131         *cli_ret = cli;
 132         *pipe_ret = netlogon_pipe;
 133         *creds_ret = talloc_move(mem_ctx, &netlogon_creds);
 134
 135         TALLOC_FREE(frame);
 136         return NT_STATUS_OK;
 137 }
 138
 139 /***********************************************************************
 140  Do the same as security=server, but using NT Domain calls and a session
 141  key from the machine password.  If the server parameter is specified
 142  use it, otherwise figure out a server from the 'password server' param.
 143 ************************************************************************/
 144
 145 static NTSTATUS domain_client_validate(TALLOC_CTX *mem_ctx,
 146                                         const struct auth_usersupplied_info *user_info,
 147                                         const char *domain,
 148                                         uchar chal[8],
 149                                         struct auth_serversupplied_info **server_info,
 150                                         const char *dc_name,
 151                                         const struct sockaddr_storage *dc_ss)
 152
 153 {
 154         TALLOC_CTX *frame = talloc_stackframe();
 155         struct netr_SamInfo3 *info3 = NULL;
 156         struct cli_state *cli = NULL;
 157         struct rpc_pipe_client *netlogon_pipe = NULL;
 158         struct netlogon_creds_cli_context *netlogon_creds = NULL;
 159         NTSTATUS nt_status = NT_STATUS_NO_LOGON_SERVERS;
 160         int i;
 161         uint8_t authoritative = 0;
 162         uint32_t flags = 0;
 163
 164         /*
 165          * At this point, smb_apasswd points to the lanman response to
 166          * the challenge in local_challenge, and smb_ntpasswd points to
 167          * the NT response to the challenge in local_challenge. Ship
 168          * these over the secure channel to a domain controller and
 169          * see if they were valid.
 170          */
 171
 172         /* rety loop for robustness */
 173
 174         for (i = 0; !NT_STATUS_IS_OK(nt_status) && (i < 3); i++) {
 175                 nt_status = connect_to_domain_password_server(&cli,
 176                                                         domain,
 177                                                         dc_name,
 178                                                         dc_ss,
 179                                                         &netlogon_pipe,
 180                                                         frame,
 181                                                         &netlogon_creds);
 182         }
 183
 184         if ( !NT_STATUS_IS_OK(nt_status) ) {
 185                 DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
 186                 TALLOC_FREE(frame);
 187                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 188                         return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE;
 189                 }
 190                 return nt_status;
 191         }
 192
 193         /* store a successful connection */
 194
 195         saf_store(domain, dc_name);
 196
 197         /*
 198          * If this call succeeds, we now have lots of info about the user
 199          * in the info3 structure.
 200          */
 201
 202         nt_status = rpccli_netlogon_network_logon(netlogon_creds,
 203                                                   netlogon_pipe->binding_handle,
 204                                                   mem_ctx,
 205                                                   user_info->logon_parameters,         /* flags such as 'allow workstation logon' */
 206                                                   user_info->client.account_name,      /* user name logging on. */
 207                                                   user_info->client.domain_name,       /* domain name */
 208                                                   user_info->workstation_name,         /* workstation name */
 209                                                   chal,                                /* 8 byte challenge. */
 210                                                   user_info->password.response.lanman, /* lanman 24 byte response */
 211                                                   user_info->password.response.nt,     /* nt 24 byte response */
 212                                                   &authoritative,
 213                                                   &flags,
 214                                                   &info3);                             /* info3 out */
 215
 216         /* Let go as soon as possible so we avoid any potential deadlocks
 217            with winbind lookup up users or groups. */
 218
 219         TALLOC_FREE(mutex);
 220
 221         if (!NT_STATUS_IS_OK(nt_status)) {
 222                 DEBUG(0,("domain_client_validate: unable to validate password "
 223                          "for user %s in domain %s to Domain controller %s. "
 224                          "Error was %s.\n", user_info->client.account_name,
 225                          user_info->client.domain_name, dc_name,
 226                          nt_errstr(nt_status)));
 227
 228                 /* map to something more useful */
 229                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 230                         nt_status = NT_STATUS_NO_LOGON_SERVERS;
 231                 }
 232                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER) &&
 233                     (authoritative == 0)) {
 234                         nt_status = NT_STATUS_NOT_IMPLEMENTED;
 235                 }
 236         } else {
 237                 nt_status = make_server_info_info3(mem_ctx,
 238                                                    user_info->client.account_name,
 239                                                    domain,
 240                                                    server_info,
 241                                                    info3);
 242
 243                 if (NT_STATUS_IS_OK(nt_status)) {
 244                         (*server_info)->nss_token |= user_info->was_mapped;
 245                         netsamlogon_cache_store(user_info->client.account_name, info3);
 246                         TALLOC_FREE(info3);
 247                 }
 248         }
 249
 250         /* Note - once the cli stream is shutdown the mem_ctx used
 251            to allocate the other_sids and gids structures has been deleted - so
 252            these pointers are no longer valid..... */
 253
 254         cli_shutdown(cli);
 255         TALLOC_FREE(frame);
 256         return nt_status;
 257 }
 258
 259 /****************************************************************************
 260  Check for a valid username and password in security=domain mode.
 261 ****************************************************************************/
 262
 263 static NTSTATUS check_ntdomain_security(const struct auth_context *auth_context,
 264                                         void *my_private_data,
 265                                         TALLOC_CTX *mem_ctx,
 266                                         const struct auth_usersupplied_info *user_info,
 267                                         struct auth_serversupplied_info **server_info)
 268 {
 269         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 270         const char *domain = lp_workgroup();
 271         fstring dc_name;
 272         struct sockaddr_storage dc_ss;
 273
 274         if ( lp_server_role() != ROLE_DOMAIN_MEMBER ) {
 275                 DEBUG(0,("check_ntdomain_security: Configuration error!  Cannot use "
 276                         "ntdomain auth method when not a member of a domain.\n"));
 277                 return NT_STATUS_NOT_IMPLEMENTED;
 278         }
 279
 280         if (!user_info || !server_info || !auth_context) {
 281                 DEBUG(1,("check_ntdomain_security: Critical variables not present.  Failing.\n"));
 282                 return NT_STATUS_INVALID_PARAMETER;
 283         }
 284
 285         DEBUG(10, ("Check auth for: [%s]\n", user_info->mapped.account_name));
 286
 287         /*
 288          * Check that the requested domain is not our own machine name.
 289          * If it is, we should never check the PDC here, we use our own local
 290          * password file.
 291          */
 292
 293         if(strequal(get_global_sam_name(), user_info->mapped.domain_name)) {
 294                 DEBUG(3,("check_ntdomain_security: Requested domain was for this machine.\n"));
 295                 return NT_STATUS_NOT_IMPLEMENTED;
 296         }
 297
 298         /* we need our DC to send the net_sam_logon() request to */
 299
 300         if ( !get_dc_name(domain, NULL, dc_name, &dc_ss) ) {
 301                 DEBUG(5,("check_ntdomain_security: unable to locate a DC for domain %s\n",
 302                         user_info->mapped.domain_name));
 303                 return NT_STATUS_NO_LOGON_SERVERS;
 304         }
 305
 306         nt_status = domain_client_validate(mem_ctx,
 307                                         user_info,
 308                                         domain,
 309                                         (uchar *)auth_context->challenge.data,
 310                                         server_info,
 311                                         dc_name,
 312                                         &dc_ss);
 313
 314         return nt_status;
 315 }
 316
 317 /* module initialisation */
 318 static NTSTATUS auth_init_ntdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 319 {
 320         struct auth_methods *result;
 321
 322         result = talloc_zero(auth_context, struct auth_methods);
 323         if (result == NULL) {
 324                 return NT_STATUS_NO_MEMORY;
 325         }
 326         result->name = "ntdomain";
 327         result->auth = check_ntdomain_security;
 328
 329         *auth_method = result;
 330         return NT_STATUS_OK;
 331 }
 332
 333
 334 /****************************************************************************
 335  Check for a valid username and password in a trusted domain
 336 ****************************************************************************/
 337
 338 static NTSTATUS check_trustdomain_security(const struct auth_context *auth_context,
 339                                            void *my_private_data,
 340                                            TALLOC_CTX *mem_ctx,
 341                                            const struct auth_usersupplied_info *user_info,
 342                                            struct auth_serversupplied_info **server_info)
 343 {
 344         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 345         fstring dc_name;
 346         struct sockaddr_storage dc_ss;
 347
 348         if (!user_info || !server_info || !auth_context) {
 349                 DEBUG(1,("check_trustdomain_security: Critical variables not present.  Failing.\n"));
 350                 return NT_STATUS_INVALID_PARAMETER;
 351         }
 352
 353         DEBUG(10, ("Check auth for: [%s]\n", user_info->mapped.account_name));
 354
 355         /*
 356          * Check that the requested domain is not our own machine name or domain name.
 357          */
 358
 359         if( strequal(get_global_sam_name(), user_info->mapped.domain_name)) {
 360                 DEBUG(3,("check_trustdomain_security: Requested domain [%s] was for this machine.\n",
 361                         user_info->mapped.domain_name));
 362                 return NT_STATUS_NOT_IMPLEMENTED;
 363         }
 364
 365         /* No point is bothering if this is not a trusted domain.
 366            This return makes "map to guest = bad user" work again.
 367            The logic is that if we know nothing about the domain, that
 368            user is not known to us and does not exist */
 369
 370         if ( !is_trusted_domain( user_info->mapped.domain_name ) )
 371                 return NT_STATUS_NOT_IMPLEMENTED;
 372
 373         /* use get_dc_name() for consistency even through we know that it will be
 374            a netbios name */
 375
 376         if ( !get_dc_name(user_info->mapped.domain_name, NULL, dc_name, &dc_ss) ) {
 377                 DEBUG(5,("check_trustdomain_security: unable to locate a DC for domain %s\n",
 378                         user_info->mapped.domain_name));
 379                 return NT_STATUS_NO_LOGON_SERVERS;
 380         }
 381
 382         nt_status = domain_client_validate(mem_ctx,
 383                                            user_info,
 384                                            user_info->mapped.domain_name,
 385                                            (uchar *)auth_context->challenge.data,
 386                                            server_info,
 387                                            dc_name,
 388                                            &dc_ss);
 389
 390         return nt_status;
 391 }
 392
 393 /* module initialisation */
 394 static NTSTATUS auth_init_trustdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 395 {
 396         struct auth_methods *result;
 397
 398         result = talloc_zero(auth_context, struct auth_methods);
 399         if (result == NULL) {
 400                 return NT_STATUS_NO_MEMORY;
 401         }
 402         result->name = "trustdomain";
 403         result->auth = check_trustdomain_security;
 404
 405         *auth_method = result;
 406         return NT_STATUS_OK;
 407 }
 408
 409 NTSTATUS auth_domain_init(TALLOC_CTX *mem_ctx)
 410 {
 411         smb_register_auth(AUTH_INTERFACE_VERSION, "trustdomain", auth_init_trustdomain);
 412         smb_register_auth(AUTH_INTERFACE_VERSION, "ntdomain", auth_init_ntdomain);
 413         return NT_STATUS_OK;
 414 }