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.syntax_id, NCACN_NP,
 119                         DCERPC_AUTH_LEVEL_PRIVACY, domain, &netlogon_pipe);
 120         } else {
 121                 result = cli_rpc_pipe_open_noauth(
 122                         *cli, &ndr_table_netlogon.syntax_id, &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                 enum netr_SchannelType sec_chan_type = 0;
 138                 unsigned char machine_pwd[16];
 139                 const char *account_name;
 140
 141                 if (!get_trust_pw_hash(domain, machine_pwd, &account_name,
 142                                        &sec_chan_type))
 143                 {
 144                         DEBUG(0, ("connect_to_domain_password_server: could not fetch "
 145                         "trust account password for domain '%s'\n",
 146                                 domain));
 147                         cli_shutdown(*cli);
 148                         *cli = NULL;
 149                         TALLOC_FREE(mutex);
 150                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 151                 }
 152
 153                 result = rpccli_netlogon_setup_creds(netlogon_pipe,
 154                                         dc_name, /* server name */
 155                                         domain, /* domain */
 156                                         lp_netbios_name(), /* client name */
 157                                         account_name, /* machine account name */
 158                                         machine_pwd,
 159                                         sec_chan_type,
 160                                         &neg_flags);
 161
 162                 if (!NT_STATUS_IS_OK(result)) {
 163                         cli_shutdown(*cli);
 164                         *cli = NULL;
 165                         TALLOC_FREE(mutex);
 166                         return result;
 167                 }
 168         }
 169
 170         if(!netlogon_pipe) {
 171                 DEBUG(0, ("connect_to_domain_password_server: unable to open "
 172                           "the domain client session to machine %s. Error "
 173                           "was : %s.\n", dc_name, nt_errstr(result)));
 174                 cli_shutdown(*cli);
 175                 *cli = NULL;
 176                 TALLOC_FREE(mutex);
 177                 return NT_STATUS_NO_LOGON_SERVERS;
 178         }
 179
 180         /* We exit here with the mutex *locked*. JRA */
 181
 182         *pipe_ret = netlogon_pipe;
 183
 184         return NT_STATUS_OK;
 185 }
 186
 187 /***********************************************************************
 188  Do the same as security=server, but using NT Domain calls and a session
 189  key from the machine password.  If the server parameter is specified
 190  use it, otherwise figure out a server from the 'password server' param.
 191 ************************************************************************/
 192
 193 static NTSTATUS domain_client_validate(TALLOC_CTX *mem_ctx,
 194                                         const struct auth_usersupplied_info *user_info,
 195                                         const char *domain,
 196                                         uchar chal[8],
 197                                         struct auth_serversupplied_info **server_info,
 198                                         const char *dc_name,
 199                                         const struct sockaddr_storage *dc_ss)
 200
 201 {
 202         struct netr_SamInfo3 *info3 = NULL;
 203         struct cli_state *cli = NULL;
 204         struct rpc_pipe_client *netlogon_pipe = NULL;
 205         NTSTATUS nt_status = NT_STATUS_NO_LOGON_SERVERS;
 206         int i;
 207
 208         /*
 209          * At this point, smb_apasswd points to the lanman response to
 210          * the challenge in local_challenge, and smb_ntpasswd points to
 211          * the NT response to the challenge in local_challenge. Ship
 212          * these over the secure channel to a domain controller and
 213          * see if they were valid.
 214          */
 215
 216         /* rety loop for robustness */
 217
 218         for (i = 0; !NT_STATUS_IS_OK(nt_status) && (i < 3); i++) {
 219                 nt_status = connect_to_domain_password_server(&cli,
 220                                                         domain,
 221                                                         dc_name,
 222                                                         dc_ss,
 223                                                         &netlogon_pipe);
 224         }
 225
 226         if ( !NT_STATUS_IS_OK(nt_status) ) {
 227                 DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
 228                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 229                         return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE;
 230                 }
 231                 return nt_status;
 232         }
 233
 234         /* store a successful connection */
 235
 236         saf_store(domain, dc_name);
 237
 238         /*
 239          * If this call succeeds, we now have lots of info about the user
 240          * in the info3 structure.
 241          */
 242
 243         nt_status = rpccli_netlogon_sam_network_logon(netlogon_pipe,
 244                                                       mem_ctx,
 245                                                       user_info->logon_parameters,         /* flags such as 'allow workstation logon' */
 246                                                       dc_name,                             /* server name */
 247                                                       user_info->client.account_name,      /* user name logging on. */
 248                                                       user_info->client.domain_name,       /* domain name */
 249                                                       user_info->workstation_name,         /* workstation name */
 250                                                       chal,                                /* 8 byte challenge. */
 251                                                       3,                                   /* validation level */
 252                                                       user_info->password.response.lanman, /* lanman 24 byte response */
 253                                                       user_info->password.response.nt,     /* nt 24 byte response */
 254                                                       &info3);                             /* info3 out */
 255
 256         /* Let go as soon as possible so we avoid any potential deadlocks
 257            with winbind lookup up users or groups. */
 258
 259         TALLOC_FREE(mutex);
 260
 261         if (!NT_STATUS_IS_OK(nt_status)) {
 262                 DEBUG(0,("domain_client_validate: unable to validate password "
 263                          "for user %s in domain %s to Domain controller %s. "
 264                          "Error was %s.\n", user_info->client.account_name,
 265                          user_info->client.domain_name, dc_name,
 266                          nt_errstr(nt_status)));
 267
 268                 /* map to something more useful */
 269                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 270                         nt_status = NT_STATUS_NO_LOGON_SERVERS;
 271                 }
 272         } else {
 273                 nt_status = make_server_info_info3(mem_ctx,
 274                                                    user_info->client.account_name,
 275                                                    domain,
 276                                                    server_info,
 277                                                    info3);
 278
 279                 if (NT_STATUS_IS_OK(nt_status)) {
 280                         (*server_info)->nss_token |= user_info->was_mapped;
 281                         netsamlogon_cache_store(user_info->client.account_name, info3);
 282                         TALLOC_FREE(info3);
 283                 }
 284         }
 285
 286         /* Note - once the cli stream is shutdown the mem_ctx used
 287            to allocate the other_sids and gids structures has been deleted - so
 288            these pointers are no longer valid..... */
 289
 290         cli_shutdown(cli);
 291         return nt_status;
 292 }
 293
 294 /****************************************************************************
 295  Check for a valid username and password in security=domain mode.
 296 ****************************************************************************/
 297
 298 static NTSTATUS check_ntdomain_security(const struct auth_context *auth_context,
 299                                         void *my_private_data,
 300                                         TALLOC_CTX *mem_ctx,
 301                                         const struct auth_usersupplied_info *user_info,
 302                                         struct auth_serversupplied_info **server_info)
 303 {
 304         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 305         const char *domain = lp_workgroup();
 306         fstring dc_name;
 307         struct sockaddr_storage dc_ss;
 308
 309         if ( lp_server_role() != ROLE_DOMAIN_MEMBER ) {
 310                 DEBUG(0,("check_ntdomain_security: Configuration error!  Cannot use "
 311                         "ntdomain auth method when not a member of a domain.\n"));
 312                 return NT_STATUS_NOT_IMPLEMENTED;
 313         }
 314
 315         if (!user_info || !server_info || !auth_context) {
 316                 DEBUG(1,("check_ntdomain_security: Critical variables not present.  Failing.\n"));
 317                 return NT_STATUS_INVALID_PARAMETER;
 318         }
 319
 320         DEBUG(10, ("Check auth for: [%s]\n", user_info->mapped.account_name));
 321
 322         /*
 323          * Check that the requested domain is not our own machine name.
 324          * If it is, we should never check the PDC here, we use our own local
 325          * password file.
 326          */
 327
 328         if(strequal(get_global_sam_name(), user_info->mapped.domain_name)) {
 329                 DEBUG(3,("check_ntdomain_security: Requested domain was for this machine.\n"));
 330                 return NT_STATUS_NOT_IMPLEMENTED;
 331         }
 332
 333         /* we need our DC to send the net_sam_logon() request to */
 334
 335         if ( !get_dc_name(domain, NULL, dc_name, &dc_ss) ) {
 336                 DEBUG(5,("check_ntdomain_security: unable to locate a DC for domain %s\n",
 337                         user_info->mapped.domain_name));
 338                 return NT_STATUS_NO_LOGON_SERVERS;
 339         }
 340
 341         nt_status = domain_client_validate(mem_ctx,
 342                                         user_info,
 343                                         domain,
 344                                         (uchar *)auth_context->challenge.data,
 345                                         server_info,
 346                                         dc_name,
 347                                         &dc_ss);
 348
 349         return nt_status;
 350 }
 351
 352 /* module initialisation */
 353 static NTSTATUS auth_init_ntdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 354 {
 355         struct auth_methods *result;
 356
 357         result = talloc_zero(auth_context, struct auth_methods);
 358         if (result == NULL) {
 359                 return NT_STATUS_NO_MEMORY;
 360         }
 361         result->name = "ntdomain";
 362         result->auth = check_ntdomain_security;
 363
 364         *auth_method = result;
 365         return NT_STATUS_OK;
 366 }
 367
 368
 369 /****************************************************************************
 370  Check for a valid username and password in a trusted domain
 371 ****************************************************************************/
 372
 373 static NTSTATUS check_trustdomain_security(const struct auth_context *auth_context,
 374                                            void *my_private_data,
 375                                            TALLOC_CTX *mem_ctx,
 376                                            const struct auth_usersupplied_info *user_info,
 377                                            struct auth_serversupplied_info **server_info)
 378 {
 379         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 380         unsigned char trust_md4_password[16];
 381         char *trust_password;
 382         fstring dc_name;
 383         struct sockaddr_storage dc_ss;
 384
 385         if (!user_info || !server_info || !auth_context) {
 386                 DEBUG(1,("check_trustdomain_security: Critical variables not present.  Failing.\n"));
 387                 return NT_STATUS_INVALID_PARAMETER;
 388         }
 389
 390         DEBUG(10, ("Check auth for: [%s]\n", user_info->mapped.account_name));
 391
 392         /*
 393          * Check that the requested domain is not our own machine name or domain name.
 394          */
 395
 396         if( strequal(get_global_sam_name(), user_info->mapped.domain_name)) {
 397                 DEBUG(3,("check_trustdomain_security: Requested domain [%s] was for this machine.\n",
 398                         user_info->mapped.domain_name));
 399                 return NT_STATUS_NOT_IMPLEMENTED;
 400         }
 401
 402         /* No point is bothering if this is not a trusted domain.
 403            This return makes "map to guest = bad user" work again.
 404            The logic is that if we know nothing about the domain, that
 405            user is not known to us and does not exist */
 406
 407         if ( !is_trusted_domain( user_info->mapped.domain_name ) )
 408                 return NT_STATUS_NOT_IMPLEMENTED;
 409
 410         /*
 411          * Get the trusted account password for the trusted domain
 412          * No need to become_root() as secrets_init() is done at startup.
 413          */
 414
 415         if (!pdb_get_trusteddom_pw(user_info->mapped.domain_name, &trust_password,
 416                                    NULL, NULL)) {
 417                 DEBUG(0, ("check_trustdomain_security: could not fetch trust "
 418                           "account password for domain %s\n",
 419                           user_info->mapped.domain_name));
 420                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 421         }
 422
 423 #ifdef DEBUG_PASSWORD
 424         DEBUG(100, ("Trust password for domain %s is %s\n", user_info->mapped.domain_name,
 425                     trust_password));
 426 #endif
 427         E_md4hash(trust_password, trust_md4_password);
 428         SAFE_FREE(trust_password);
 429
 430         /* use get_dc_name() for consistency even through we know that it will be
 431            a netbios name */
 432
 433         if ( !get_dc_name(user_info->mapped.domain_name, NULL, dc_name, &dc_ss) ) {
 434                 DEBUG(5,("check_trustdomain_security: unable to locate a DC for domain %s\n",
 435                         user_info->mapped.domain_name));
 436                 return NT_STATUS_NO_LOGON_SERVERS;
 437         }
 438
 439         nt_status = domain_client_validate(mem_ctx,
 440                                            user_info,
 441                                            user_info->mapped.domain_name,
 442                                            (uchar *)auth_context->challenge.data,
 443                                            server_info,
 444                                            dc_name,
 445                                            &dc_ss);
 446
 447         return nt_status;
 448 }
 449
 450 /* module initialisation */
 451 static NTSTATUS auth_init_trustdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 452 {
 453         struct auth_methods *result;
 454
 455         result = talloc_zero(auth_context, struct auth_methods);
 456         if (result == NULL) {
 457                 return NT_STATUS_NO_MEMORY;
 458         }
 459         result->name = "trustdomain";
 460         result->auth = check_trustdomain_security;
 461
 462         *auth_method = result;
 463         return NT_STATUS_OK;
 464 }
 465
 466 NTSTATUS auth_domain_init(void)
 467 {
 468         smb_register_auth(AUTH_INTERFACE_VERSION, "trustdomain", auth_init_trustdomain);
 469         smb_register_auth(AUTH_INTERFACE_VERSION, "ntdomain", auth_init_ntdomain);
 470         return NT_STATUS_OK;
 471 }