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 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,
  45                                                 const char *dc_name,
  46                                                 struct in_addr dc_ip,
  47                                                 struct rpc_pipe_client **pipe_ret,
  48                                                 BOOL *retry)
  49 {
  50         NTSTATUS result;
  51         struct rpc_pipe_client *netlogon_pipe = NULL;
  52
  53         *pipe_ret = NULL;
  54
  55         /* TODO: Send a SAMLOGON request to determine whether this is a valid
  56            logonserver.  We can avoid a 30-second timeout if the DC is down
  57            if the SAMLOGON request fails as it is only over UDP. */
  58
  59         /* we use a mutex to prevent two connections at once - when a
  60            Win2k PDC get two connections where one hasn't completed a
  61            session setup yet it will send a TCP reset to the first
  62            connection (tridge) */
  63
  64         /*
  65          * With NT4.x DC's *all* authentication must be serialized to avoid
  66          * ACCESS_DENIED errors if 2 auths are done from the same machine. JRA.
  67          */
  68
  69         if (!grab_server_mutex(dc_name)) {
  70                 return NT_STATUS_NO_LOGON_SERVERS;
  71         }
  72
  73         /* Attempt connection */
  74         *retry = True;
  75         result = cli_full_connection(cli, global_myname(), dc_name, &dc_ip, 0,
  76                 "IPC$", "IPC", "", "", "", 0, Undefined, retry);
  77
  78         if (!NT_STATUS_IS_OK(result)) {
  79                 /* map to something more useful */
  80                 if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) {
  81                         result = NT_STATUS_NO_LOGON_SERVERS;
  82                 }
  83
  84                 release_server_mutex();
  85                 return result;
  86         }
  87
  88         /*
  89          * We now have an anonymous connection to IPC$ on the domain password server.
  90          */
  91
  92         /*
  93          * Even if the connect succeeds we need to setup the netlogon
  94          * pipe here. We do this as we may just have changed the domain
  95          * account password on the PDC and yet we may be talking to
  96          * a BDC that doesn't have this replicated yet. In this case
  97          * a successful connect to a DC needs to take the netlogon connect
  98          * into account also. This patch from "Bjart Kvarme" <bjart.kvarme@usit.uio.no>.
  99          */
 100
 101         /* open the netlogon pipe. */
 102         if (lp_client_schannel()) {
 103                 /* We also setup the creds chain in the open_schannel call. */
 104                 netlogon_pipe = cli_rpc_pipe_open_schannel(*cli, PI_NETLOGON,
 105                                         PIPE_AUTH_LEVEL_PRIVACY, domain, &result);
 106         } else {
 107                 netlogon_pipe = cli_rpc_pipe_open_noauth(*cli, PI_NETLOGON, &result);
 108         }
 109
 110         if(!netlogon_pipe) {
 111                 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
 112 machine %s. Error was : %s.\n", dc_name, nt_errstr(result)));
 113                 cli_shutdown(*cli);
 114                 release_server_mutex();
 115                 return result;
 116         }
 117
 118         if (!lp_client_schannel()) {
 119                 /* We need to set up a creds chain on an unauthenticated netlogon pipe. */
 120                 uint32 neg_flags = NETLOGON_NEG_AUTH2_FLAGS;
 121                 uint32 sec_chan_type = 0;
 122                 unsigned char machine_pwd[16];
 123
 124                 if (!get_trust_pw(domain, machine_pwd, &sec_chan_type)) {
 125                         DEBUG(0, ("connect_to_domain_password_server: could not fetch "
 126                         "trust account password for domain '%s'\n",
 127                                 domain));
 128                         cli_shutdown(*cli);
 129                         release_server_mutex();
 130                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 131                 }
 132
 133                 result = rpccli_netlogon_setup_creds(netlogon_pipe,
 134                                         dc_name, /* server name */
 135                                         domain, /* domain */
 136                                         global_myname(), /* client name */
 137                                         global_myname(), /* machine account name */
 138                                         machine_pwd,
 139                                         sec_chan_type,
 140                                         &neg_flags);
 141
 142                 if (!NT_STATUS_IS_OK(result)) {
 143                         cli_shutdown(*cli);
 144                         release_server_mutex();
 145                         return result;
 146                 }
 147         }
 148
 149         if(!netlogon_pipe) {
 150                 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
 151 machine %s. Error was : %s.\n", dc_name, cli_errstr(*cli)));
 152                 cli_shutdown(*cli);
 153                 release_server_mutex();
 154                 return NT_STATUS_NO_LOGON_SERVERS;
 155         }
 156
 157         /* We exit here with the mutex *locked*. JRA */
 158
 159         *pipe_ret = netlogon_pipe;
 160
 161         return NT_STATUS_OK;
 162 }
 163
 164 /***********************************************************************
 165  Do the same as security=server, but using NT Domain calls and a session
 166  key from the machine password.  If the server parameter is specified
 167  use it, otherwise figure out a server from the 'password server' param.
 168 ************************************************************************/
 169
 170 static NTSTATUS domain_client_validate(TALLOC_CTX *mem_ctx,
 171                                         const auth_usersupplied_info *user_info,
 172                                         const char *domain,
 173                                         uchar chal[8],
 174                                         auth_serversupplied_info **server_info,
 175                                         const char *dc_name,
 176                                         struct in_addr dc_ip)
 177
 178 {
 179         NET_USER_INFO_3 info3;
 180         struct cli_state *cli = NULL;
 181         struct rpc_pipe_client *netlogon_pipe = NULL;
 182         NTSTATUS nt_status = NT_STATUS_NO_LOGON_SERVERS;
 183         int i;
 184         BOOL retry = True;
 185
 186         /*
 187          * At this point, smb_apasswd points to the lanman response to
 188          * the challenge in local_challenge, and smb_ntpasswd points to
 189          * the NT response to the challenge in local_challenge. Ship
 190          * these over the secure channel to a domain controller and
 191          * see if they were valid.
 192          */
 193
 194         /* rety loop for robustness */
 195
 196         for (i = 0; !NT_STATUS_IS_OK(nt_status) && retry && (i < 3); i++) {
 197                 nt_status = connect_to_domain_password_server(&cli,
 198                                                         domain,
 199                                                         dc_name,
 200                                                         dc_ip,
 201                                                         &netlogon_pipe,
 202                                                         &retry);
 203         }
 204
 205         if ( !NT_STATUS_IS_OK(nt_status) ) {
 206                 DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
 207                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 208                         return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE;
 209                 }
 210                 return nt_status;
 211         }
 212
 213         /* store a successful connection */
 214
 215         saf_store( domain, cli->desthost );
 216
 217         ZERO_STRUCT(info3);
 218
 219         /*
 220          * If this call succeeds, we now have lots of info about the user
 221          * in the info3 structure.
 222          */
 223
 224         nt_status = rpccli_netlogon_sam_network_logon(netlogon_pipe,
 225                                                       mem_ctx,
 226                                                       user_info->logon_parameters,/* flags such as 'allow workstation logon' */
 227                                                       dc_name,                    /* server name */
 228                                                       user_info->smb_name,        /* user name logging on. */
 229                                                       user_info->domain,          /* domain name */
 230                                                       user_info->wksta_name,      /* workstation name */
 231                                                       chal,                       /* 8 byte challenge. */
 232                                                       user_info->lm_resp,         /* lanman 24 byte response */
 233                                                       user_info->nt_resp,         /* nt 24 byte response */
 234                                                       &info3);                    /* info3 out */
 235
 236         /* Let go as soon as possible so we avoid any potential deadlocks
 237            with winbind lookup up users or groups. */
 238
 239         release_server_mutex();
 240
 241         if (!NT_STATUS_IS_OK(nt_status)) {
 242                 DEBUG(0,("domain_client_validate: unable to validate password "
 243                          "for user %s in domain %s to Domain controller %s. "
 244                          "Error was %s.\n", user_info->smb_name,
 245                          user_info->domain, dc_name,
 246                          nt_errstr(nt_status)));
 247
 248                 /* map to something more useful */
 249                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 250                         nt_status = NT_STATUS_NO_LOGON_SERVERS;
 251                 }
 252         } else {
 253                 nt_status = make_server_info_info3(mem_ctx,
 254                                                 user_info->smb_name,
 255                                                 domain,
 256                                                 server_info,
 257                                                 &info3);
 258
 259                 netsamlogon_cache_store( user_info->smb_name, &info3 );
 260         }
 261
 262         /* Note - once the cli stream is shutdown the mem_ctx used
 263            to allocate the other_sids and gids structures has been deleted - so
 264            these pointers are no longer valid..... */
 265
 266         cli_shutdown(cli);
 267         return nt_status;
 268 }
 269
 270 /****************************************************************************
 271  Check for a valid username and password in security=domain mode.
 272 ****************************************************************************/
 273
 274 static NTSTATUS check_ntdomain_security(const struct auth_context *auth_context,
 275                                         void *my_private_data,
 276                                         TALLOC_CTX *mem_ctx,
 277                                         const auth_usersupplied_info *user_info,
 278                                         auth_serversupplied_info **server_info)
 279 {
 280         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 281         const char *domain = lp_workgroup();
 282         fstring dc_name;
 283         struct in_addr dc_ip;
 284
 285         if ( lp_server_role() != ROLE_DOMAIN_MEMBER ) {
 286                 DEBUG(0,("check_ntdomain_security: Configuration error!  Cannot use "
 287                         "ntdomain auth method when not a member of a domain.\n"));
 288                 return NT_STATUS_NOT_IMPLEMENTED;
 289         }
 290
 291         if (!user_info || !server_info || !auth_context) {
 292                 DEBUG(1,("check_ntdomain_security: Critical variables not present.  Failing.\n"));
 293                 return NT_STATUS_INVALID_PARAMETER;
 294         }
 295
 296         /*
 297          * Check that the requested domain is not our own machine name.
 298          * If it is, we should never check the PDC here, we use our own local
 299          * password file.
 300          */
 301
 302         if(strequal(get_global_sam_name(), user_info->domain)) {
 303                 DEBUG(3,("check_ntdomain_security: Requested domain was for this machine.\n"));
 304                 return NT_STATUS_NOT_IMPLEMENTED;
 305         }
 306
 307         /* we need our DC to send the net_sam_logon() request to */
 308
 309         if ( !get_dc_name(domain, NULL, dc_name, &dc_ip) ) {
 310                 DEBUG(5,("check_ntdomain_security: unable to locate a DC for domain %s\n",
 311                         user_info->domain));
 312                 return NT_STATUS_NO_LOGON_SERVERS;
 313         }
 314
 315         nt_status = domain_client_validate(mem_ctx,
 316                                         user_info,
 317                                         domain,
 318                                         (uchar *)auth_context->challenge.data,
 319                                         server_info,
 320                                         dc_name,
 321                                         dc_ip);
 322
 323         return nt_status;
 324 }
 325
 326 /* module initialisation */
 327 static NTSTATUS auth_init_ntdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 328 {
 329         if (!make_auth_methods(auth_context, auth_method)) {
 330                 return NT_STATUS_NO_MEMORY;
 331         }
 332
 333         (*auth_method)->name = "ntdomain";
 334         (*auth_method)->auth = check_ntdomain_security;
 335         return NT_STATUS_OK;
 336 }
 337
 338
 339 /****************************************************************************
 340  Check for a valid username and password in a trusted domain
 341 ****************************************************************************/
 342
 343 static NTSTATUS check_trustdomain_security(const struct auth_context *auth_context,
 344                                            void *my_private_data,
 345                                            TALLOC_CTX *mem_ctx,
 346                                            const auth_usersupplied_info *user_info,
 347                                            auth_serversupplied_info **server_info)
 348 {
 349         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 350         unsigned char trust_md4_password[16];
 351         char *trust_password;
 352         time_t last_change_time;
 353         DOM_SID sid;
 354         fstring dc_name;
 355         struct in_addr dc_ip;
 356
 357         if (!user_info || !server_info || !auth_context) {
 358                 DEBUG(1,("check_trustdomain_security: Critical variables not present.  Failing.\n"));
 359                 return NT_STATUS_INVALID_PARAMETER;
 360         }
 361
 362         /*
 363          * Check that the requested domain is not our own machine name or domain name.
 364          */
 365
 366         if( strequal(get_global_sam_name(), user_info->domain)) {
 367                 DEBUG(3,("check_trustdomain_security: Requested domain [%s] was for this machine.\n",
 368                         user_info->domain));
 369                 return NT_STATUS_NOT_IMPLEMENTED;
 370         }
 371
 372         /* No point is bothering if this is not a trusted domain.
 373            This return makes "map to guest = bad user" work again.
 374            The logic is that if we know nothing about the domain, that
 375            user is not known to us and does not exist */
 376
 377         if ( !is_trusted_domain( user_info->domain ) )
 378                 return NT_STATUS_NOT_IMPLEMENTED;
 379
 380         /*
 381          * Get the trusted account password for the trusted domain
 382          * No need to become_root() as secrets_init() is done at startup.
 383          */
 384
 385         if (!secrets_fetch_trusted_domain_password(user_info->domain, &trust_password,
 386                                 &sid, &last_change_time)) {
 387                 DEBUG(0, ("check_trustdomain_security: could not fetch trust "
 388                           "account password for domain %s\n",
 389                           user_info->domain));
 390                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 391         }
 392
 393 #ifdef DEBUG_PASSWORD
 394         DEBUG(100, ("Trust password for domain %s is %s\n", user_info->domain,
 395                     trust_password));
 396 #endif
 397         E_md4hash(trust_password, trust_md4_password);
 398         SAFE_FREE(trust_password);
 399
 400 #if 0
 401         /* Test if machine password is expired and need to be changed */
 402         if (time(NULL) > last_change_time + lp_machine_password_timeout())
 403         {
 404                 global_machine_password_needs_changing = True;
 405         }
 406 #endif
 407
 408         /* use get_dc_name() for consistency even through we know that it will be
 409            a netbios name */
 410
 411         if ( !get_dc_name(user_info->domain, NULL, dc_name, &dc_ip) ) {
 412                 DEBUG(5,("check_trustdomain_security: unable to locate a DC for domain %s\n",
 413                         user_info->domain));
 414                 return NT_STATUS_NO_LOGON_SERVERS;
 415         }
 416
 417         nt_status = domain_client_validate(mem_ctx,
 418                                         user_info,
 419                                         user_info->domain,
 420                                         (uchar *)auth_context->challenge.data,
 421                                         server_info,
 422                                         dc_name,
 423                                         dc_ip);
 424
 425         return nt_status;
 426 }
 427
 428 /* module initialisation */
 429 static NTSTATUS auth_init_trustdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method)
 430 {
 431         if (!make_auth_methods(auth_context, auth_method)) {
 432                 return NT_STATUS_NO_MEMORY;
 433         }
 434
 435         (*auth_method)->name = "trustdomain";
 436         (*auth_method)->auth = check_trustdomain_security;
 437         return NT_STATUS_OK;
 438 }
 439
 440 NTSTATUS auth_domain_init(void)
 441 {
 442         smb_register_auth(AUTH_INTERFACE_VERSION, "trustdomain", auth_init_trustdomain);
 443         smb_register_auth(AUTH_INTERFACE_VERSION, "ntdomain", auth_init_ntdomain);
 444         return NT_STATUS_OK;
 445 }