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