source3/rpc_server/srv_util.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  RPC Pipe client / server routines
   4  *  Copyright (C) Andrew Tridgell              1992-1998
   5  *  Copyright (C) Luke Kenneth Casson Leighton 1996-1998,
   6  *  Copyright (C) Paul Ashton                  1997-1998.
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 /*  this module apparently provides an implementation of DCE/RPC over a
  24  *  named pipe (IPC$ connection using SMBtrans).  details of DCE/RPC
  25  *  documentation are available (in on-line form) from the X-Open group.
  26  *
  27  *  this module should provide a level of abstraction between SMB
  28  *  and DCE/RPC, while minimising the amount of mallocs, unnecessary
  29  *  data copies, and network traffic.
  30  *
  31  *  in this version, which takes a "let's learn what's going on and
  32  *  get something running" approach, there is additional network
  33  *  traffic generated, but the code should be easier to understand...
  34  *
  35  *  ... if you read the docs.  or stare at packets for weeks on end.
  36  *
  37  */
  38
  39 #include "includes.h"
  40
  41 #undef DBGC_CLASS
  42 #define DBGC_CLASS DBGC_RPC_SRV
  43
  44 /*
  45  * A list of the rids of well known BUILTIN and Domain users
  46  * and groups.
  47  */
  48
  49 rid_name builtin_alias_rids[] =
  50 {
  51     { BUILTIN_ALIAS_RID_ADMINS       , "Administrators" },
  52     { BUILTIN_ALIAS_RID_USERS        , "Users" },
  53     { BUILTIN_ALIAS_RID_GUESTS       , "Guests" },
  54     { BUILTIN_ALIAS_RID_POWER_USERS  , "Power Users" },
  55
  56     { BUILTIN_ALIAS_RID_ACCOUNT_OPS  , "Account Operators" },
  57     { BUILTIN_ALIAS_RID_SYSTEM_OPS   , "System Operators" },
  58     { BUILTIN_ALIAS_RID_PRINT_OPS    , "Print Operators" },
  59     { BUILTIN_ALIAS_RID_BACKUP_OPS   , "Backup Operators" },
  60     { BUILTIN_ALIAS_RID_REPLICATOR   , "Replicator" },
  61     { 0                             , NULL }
  62 };
  63
  64 /* array lookup of well-known Domain RID users. */
  65 rid_name domain_user_rids[] =
  66 {
  67     { DOMAIN_USER_RID_ADMIN         , "Administrator" },
  68     { DOMAIN_USER_RID_GUEST         , "Guest" },
  69     { 0                             , NULL }
  70 };
  71
  72 /* array lookup of well-known Domain RID groups. */
  73 rid_name domain_group_rids[] =
  74 {
  75     { DOMAIN_GROUP_RID_ADMINS       , "Domain Admins" },
  76     { DOMAIN_GROUP_RID_USERS        , "Domain Users" },
  77     { DOMAIN_GROUP_RID_GUESTS       , "Domain Guests" },
  78     { 0                             , NULL }
  79 };
  80
  81 /*******************************************************************
  82  gets a domain user's groups
  83  ********************************************************************/
  84 NTSTATUS get_alias_user_groups(TALLOC_CTX *ctx, DOM_SID *sid, int *numgroups, uint32 **prids, DOM_SID *q_sid)
  85 {
  86         SAM_ACCOUNT *sam_pass=NULL;
  87         int i, cur_rid=0;
  88         gid_t gid;
  89         gid_t *groups = NULL;
  90         int num_groups;
  91         GROUP_MAP map;
  92         DOM_SID tmp_sid;
  93         fstring user_name;
  94         fstring str_domsid, str_qsid;
  95         uint32 rid,grid;
  96         uint32 *rids=NULL, *new_rids=NULL;
  97         gid_t winbind_gid_low, winbind_gid_high;
  98         BOOL ret;
  99         BOOL winbind_groups_exist;
 100
 101         /*
 102          * this code is far from perfect.
 103          * first it enumerates the full /etc/group and that can be slow.
 104          * second, it works only with users' SIDs
 105          * whereas the day we support nested groups, it will have to
 106          * support both users's SIDs and domain groups' SIDs
 107          *
 108          * having our own ldap backend would be so much faster !
 109          * we're far from that, but hope one day ;-) JFM.
 110          */
 111
 112         *prids=NULL;
 113         *numgroups=0;
 114
 115         winbind_groups_exist = lp_idmap_gid(&winbind_gid_low, &winbind_gid_high);
 116
 117
 118         DEBUG(10,("get_alias_user_groups: looking if SID %s is a member of groups in the SID domain %s\n",
 119                   sid_to_string(str_qsid, q_sid), sid_to_string(str_domsid, sid)));
 120
 121         pdb_init_sam(&sam_pass);
 122         become_root();
 123         ret = pdb_getsampwsid(sam_pass, q_sid);
 124         unbecome_root();
 125         if (ret == False) {
 126                 pdb_free_sam(&sam_pass);
 127                 return NT_STATUS_NO_SUCH_USER;
 128         }
 129
 130         fstrcpy(user_name, pdb_get_username(sam_pass));
 131         grid=pdb_get_group_rid(sam_pass);
 132         if (!NT_STATUS_IS_OK(sid_to_gid(pdb_get_group_sid(sam_pass), &gid))) {
 133                 /* this should never happen */
 134                 DEBUG(2,("get_alias_user_groups: sid_to_gid failed!\n"));
 135                 pdb_free_sam(&sam_pass);
 136                 return NT_STATUS_UNSUCCESSFUL;
 137         }
 138
 139         become_root();
 140         /* on some systems this must run as root */
 141         num_groups = getgroups_user(user_name, &groups);
 142         unbecome_root();
 143         if (num_groups == -1) {
 144                 /* this should never happen */
 145                 DEBUG(2,("get_alias_user_groups: getgroups_user failed\n"));
 146                 pdb_free_sam(&sam_pass);
 147                 return NT_STATUS_UNSUCCESSFUL;
 148         }
 149
 150         for (i=0;i<num_groups;i++) {
 151
 152                 if (!get_group_from_gid(groups[i], &map)) {
 153                         DEBUG(10,("get_alias_user_groups: gid %d. not found\n", (int)groups[i]));
 154                         continue;
 155                 }
 156
 157                 /* if it's not an alias, continue */
 158                 if (map.sid_name_use != SID_NAME_ALIAS) {
 159                         DEBUG(10,("get_alias_user_groups: not returing %s, not an ALIAS group.\n", map.nt_name));
 160                         continue;
 161                 }
 162
 163                 sid_copy(&tmp_sid, &map.sid);
 164                 sid_split_rid(&tmp_sid, &rid);
 165
 166                 /* if the sid is not in the correct domain, continue */
 167                 if (!sid_equal(&tmp_sid, sid)) {
 168                         DEBUG(10,("get_alias_user_groups: not returing %s, not in the domain SID.\n", map.nt_name));
 169                         continue;
 170                 }
 171
 172                 /* Don't return winbind groups as they are not local! */
 173                 if (winbind_groups_exist && (groups[i] >= winbind_gid_low) && (groups[i] <= winbind_gid_high)) {
 174                         DEBUG(10,("get_alias_user_groups: not returing %s, not local.\n", map.nt_name));
 175                         continue;
 176                 }
 177
 178                 /* Don't return user private groups... */
 179                 if (Get_Pwnam(map.nt_name) != 0) {
 180                         DEBUG(10,("get_alias_user_groups: not returing %s, clashes with user.\n", map.nt_name));
 181                         continue;
 182                 }
 183
 184                 new_rids=(uint32 *)Realloc(rids, sizeof(uint32)*(cur_rid+1));
 185                 if (new_rids==NULL) {
 186                         DEBUG(10,("get_alias_user_groups: could not realloc memory\n"));
 187                         pdb_free_sam(&sam_pass);
 188                         free(groups);
 189                         return NT_STATUS_NO_MEMORY;
 190                 }
 191                 rids=new_rids;
 192
 193                 sid_peek_rid(&map.sid, &(rids[cur_rid]));
 194                 cur_rid++;
 195                 break;
 196         }
 197
 198         if(num_groups)
 199                 free(groups);
 200
 201         /* now check for the user's gid (the primary group rid) */
 202         for (i=0; i<cur_rid && grid!=rids[i]; i++)
 203                 ;
 204
 205         /* the user's gid is already there */
 206         if (i!=cur_rid) {
 207                 DEBUG(10,("get_alias_user_groups: user is already in the list. good.\n"));
 208                 goto done;
 209         }
 210
 211         DEBUG(10,("get_alias_user_groups: looking for gid %d of user %s\n", (int)gid, user_name));
 212
 213         if(!get_group_from_gid(gid, &map)) {
 214                 DEBUG(0,("get_alias_user_groups: gid of user %s doesn't exist. Check your "
 215                 "/etc/passwd and /etc/group files\n", user_name));
 216                 goto done;
 217         }
 218
 219         /* the primary group isn't an alias */
 220         if (map.sid_name_use!=SID_NAME_ALIAS) {
 221                 DEBUG(10,("get_alias_user_groups: not returing %s, not an ALIAS group.\n", map.nt_name));
 222                 goto done;
 223         }
 224
 225         sid_copy(&tmp_sid, &map.sid);
 226         sid_split_rid(&tmp_sid, &rid);
 227
 228         /* if the sid is not in the correct domain, continue */
 229         if (!sid_equal(&tmp_sid, sid)) {
 230                 DEBUG(10,("get_alias_user_groups: not returing %s, not in the domain SID.\n", map.nt_name));
 231                 goto done;
 232         }
 233
 234         /* Don't return winbind groups as they are not local! */
 235         if (winbind_groups_exist && (gid >= winbind_gid_low) && (gid <= winbind_gid_high)) {
 236                 DEBUG(10,("get_alias_user_groups: not returing %s, not local.\n", map.nt_name ));
 237                 goto done;
 238         }
 239
 240         /* Don't return user private groups... */
 241         if (Get_Pwnam(map.nt_name) != 0) {
 242                 DEBUG(10,("get_alias_user_groups: not returing %s, clashes with user.\n", map.nt_name ));
 243                 goto done;
 244         }
 245
 246         new_rids=(uint32 *)Realloc(rids, sizeof(uint32)*(cur_rid+1));
 247         if (new_rids==NULL) {
 248                 DEBUG(10,("get_alias_user_groups: could not realloc memory\n"));
 249                 pdb_free_sam(&sam_pass);
 250                 return NT_STATUS_NO_MEMORY;
 251         }
 252         rids=new_rids;
 253
 254         sid_peek_rid(&map.sid, &(rids[cur_rid]));
 255         cur_rid++;
 256
 257 done:
 258         *prids=rids;
 259         *numgroups=cur_rid;
 260         pdb_free_sam(&sam_pass);
 261
 262         return NT_STATUS_OK;
 263 }
 264
 265
 266 /*******************************************************************
 267  gets a domain user's groups
 268  ********************************************************************/
 269 BOOL get_domain_user_groups(TALLOC_CTX *ctx, int *numgroups, DOM_GID **pgids, SAM_ACCOUNT *sam_pass)
 270 {
 271         GROUP_MAP *map=NULL;
 272         int i, num, num_entries, cur_gid=0;
 273         struct group *grp;
 274         DOM_GID *gids;
 275         fstring user_name;
 276         uint32 grid;
 277         uint32 tmp_rid;
 278         BOOL ret;
 279
 280         *numgroups= 0;
 281
 282         fstrcpy(user_name, pdb_get_username(sam_pass));
 283         grid=pdb_get_group_rid(sam_pass);
 284
 285         DEBUG(10,("get_domain_user_groups: searching domain groups [%s] is a member of\n", user_name));
 286
 287         /* we must wrap this is become/unbecome root for ldap backends */
 288
 289         become_root();
 290         /* first get the list of the domain groups */
 291         ret = pdb_enum_group_mapping(SID_NAME_DOM_GRP, &map, &num_entries, ENUM_ONLY_MAPPED);
 292
 293         unbecome_root();
 294
 295         /* end wrapper for group enumeration */
 296
 297
 298         if ( !ret )
 299                 return False;
 300
 301         DEBUG(10,("get_domain_user_groups: there are %d mapped groups\n", num_entries));
 302
 303
 304         /*
 305          * alloc memory. In the worse case, we alloc memory for nothing.
 306          * but I prefer to alloc for nothing
 307          * than reallocing everytime.
 308          */
 309         gids = (DOM_GID *)talloc(ctx, sizeof(DOM_GID) *  num_entries);
 310
 311         /* for each group, check if the user is a member of.  Only include groups
 312            from this domain */
 313
 314         for(i=0; i<num_entries; i++) {
 315
 316                 if ( !sid_check_is_in_our_domain(&map[i].sid) ) {
 317                         DEBUG(10,("get_domain_user_groups: skipping check of %s since it is not in our domain\n",
 318                                 map[i].nt_name));
 319                         continue;
 320                 }
 321
 322                 if ((grp=getgrgid(map[i].gid)) == NULL) {
 323                         /* very weird !!! */
 324                         DEBUG(5,("get_domain_user_groups: gid %d doesn't exist anymore !\n", (int)map[i].gid));
 325                         continue;
 326                 }
 327
 328                 for(num=0; grp->gr_mem[num]!=NULL; num++) {
 329                         if(strcmp(grp->gr_mem[num], user_name)==0) {
 330                                 /* we found the user, add the group to the list */
 331                                 sid_peek_rid(&map[i].sid, &(gids[cur_gid].g_rid));
 332                                 gids[cur_gid].attr=7;
 333                                 DEBUG(10,("get_domain_user_groups: user found in group %s\n", map[i].nt_name));
 334                                 cur_gid++;
 335                                 break;
 336                         }
 337                 }
 338         }
 339
 340         /* we have checked the groups */
 341         /* we must now check the gid of the user or the primary group rid, that's the same */
 342         for (i=0; i<cur_gid && grid!=gids[i].g_rid; i++)
 343                 ;
 344
 345         /* the user's gid is already there */
 346         if (i!=cur_gid) {
 347                 /*
 348                  * the primary group of the user but be the first one in the list
 349                  * don't ask ! JFM.
 350                  */
 351                 gids[i].g_rid=gids[0].g_rid;
 352                 gids[0].g_rid=grid;
 353                 goto done;
 354         }
 355
 356         for(i=0; i<num_entries; i++) {
 357                 sid_peek_rid(&map[i].sid, &tmp_rid);
 358                 if (tmp_rid==grid) {
 359                         /*
 360                          * the primary group of the user but be the first one in the list
 361                          * don't ask ! JFM.
 362                          */
 363                         gids[cur_gid].g_rid=gids[0].g_rid;
 364                         gids[0].g_rid=tmp_rid;
 365                         gids[cur_gid].attr=7;
 366                         DEBUG(10,("get_domain_user_groups: primary gid of user found in group %s\n", map[i].nt_name));
 367                         cur_gid++;
 368                         goto done; /* leave the loop early */
 369                 }
 370         }
 371
 372         DEBUG(0,("get_domain_user_groups: primary gid of user [%s] is not a Domain group !\n", user_name));
 373         DEBUGADD(0,("get_domain_user_groups: You should fix it, NT doesn't like that\n"));
 374
 375
 376  done:
 377         *pgids=gids;
 378         *numgroups=cur_gid;
 379         SAFE_FREE(map);
 380
 381         return True;
 382 }
 383
 384 /*******************************************************************
 385  gets a domain user's groups from their already-calculated NT_USER_TOKEN
 386  ********************************************************************/
 387 NTSTATUS nt_token_to_group_list(TALLOC_CTX *mem_ctx, const DOM_SID *domain_sid,
 388                                 const NT_USER_TOKEN *nt_token,
 389                                 int *numgroups, DOM_GID **pgids)
 390 {
 391         DOM_GID *gids;
 392         int i;
 393
 394         gids = (DOM_GID *)talloc(mem_ctx, sizeof(*gids) * nt_token->num_sids);
 395
 396         if (!gids) {
 397                 return NT_STATUS_NO_MEMORY;
 398         }
 399
 400         *numgroups=0;
 401
 402         for (i=PRIMARY_GROUP_SID_INDEX; i < nt_token->num_sids; i++) {
 403                 if (sid_compare_domain(domain_sid, &nt_token->user_sids[i])==0) {
 404                         sid_peek_rid(&nt_token->user_sids[i], &(gids[*numgroups].g_rid));
 405                         gids[*numgroups].attr=7;
 406                         (*numgroups)++;
 407                 }
 408         }
 409         *pgids = gids;
 410         return NT_STATUS_OK;
 411 }
 412
 413 /*******************************************************************
 414  Look up a local (domain) rid and return a name and type.
 415  ********************************************************************/
 416 NTSTATUS local_lookup_group_name(uint32 rid, char *group_name, uint32 *type)
 417 {
 418         int i = 0;
 419         (*type) = SID_NAME_DOM_GRP;
 420
 421         DEBUG(5,("lookup_group_name: rid: %d", rid));
 422
 423         while (domain_group_rids[i].rid != rid && domain_group_rids[i].rid != 0)
 424         {
 425                 i++;
 426         }
 427
 428         if (domain_group_rids[i].rid != 0)
 429         {
 430                 fstrcpy(group_name, domain_group_rids[i].name);
 431                 DEBUG(5,(" = %s\n", group_name));
 432                 return NT_STATUS_OK;
 433         }
 434
 435         DEBUG(5,(" none mapped\n"));
 436         return NT_STATUS_NONE_MAPPED;
 437 }
 438
 439 /*******************************************************************
 440  Look up a local alias rid and return a name and type.
 441  ********************************************************************/
 442 NTSTATUS local_lookup_alias_name(uint32 rid, char *alias_name, uint32 *type)
 443 {
 444         int i = 0;
 445         (*type) = SID_NAME_WKN_GRP;
 446
 447         DEBUG(5,("lookup_alias_name: rid: %d", rid));
 448
 449         while (builtin_alias_rids[i].rid != rid && builtin_alias_rids[i].rid != 0)
 450         {
 451                 i++;
 452         }
 453
 454         if (builtin_alias_rids[i].rid != 0)
 455         {
 456                 fstrcpy(alias_name, builtin_alias_rids[i].name);
 457                 DEBUG(5,(" = %s\n", alias_name));
 458                 return NT_STATUS_OK;
 459         }
 460
 461         DEBUG(5,(" none mapped\n"));
 462         return NT_STATUS_NONE_MAPPED;
 463 }
 464
 465
 466 #if 0 /*Nobody uses this function just now*/
 467 /*******************************************************************
 468  Look up a local user rid and return a name and type.
 469  ********************************************************************/
 470 NTSTATUS local_lookup_user_name(uint32 rid, char *user_name, uint32 *type)
 471 {
 472         SAM_ACCOUNT *sampwd=NULL;
 473         int i = 0;
 474         BOOL ret;
 475
 476         (*type) = SID_NAME_USER;
 477
 478         DEBUG(5,("lookup_user_name: rid: %d", rid));
 479
 480         /* look up the well-known domain user rids first */
 481         while (domain_user_rids[i].rid != rid && domain_user_rids[i].rid != 0)
 482         {
 483                 i++;
 484         }
 485
 486         if (domain_user_rids[i].rid != 0) {
 487                 fstrcpy(user_name, domain_user_rids[i].name);
 488                 DEBUG(5,(" = %s\n", user_name));
 489                 return NT_STATUS_OK;
 490         }
 491
 492         pdb_init_sam(&sampwd);
 493
 494         /* ok, it's a user.  find the user account */
 495         become_root();
 496         ret = pdb_getsampwrid(sampwd, rid);
 497         unbecome_root();
 498
 499         if (ret == True) {
 500                 fstrcpy(user_name, pdb_get_username(sampwd) );
 501                 DEBUG(5,(" = %s\n", user_name));
 502                 pdb_free_sam(&sampwd);
 503                 return NT_STATUS_OK;
 504         }
 505
 506         DEBUG(5,(" none mapped\n"));
 507         pdb_free_sam(&sampwd);
 508         return NT_STATUS_NONE_MAPPED;
 509 }
 510
 511 #endif
 512
 513 /*******************************************************************
 514  Look up a local (domain) group name and return a rid
 515  ********************************************************************/
 516 NTSTATUS local_lookup_group_rid(char *group_name, uint32 *rid)
 517 {
 518         const char *grp_name;
 519         int i = -1; /* start do loop at -1 */
 520
 521         do /* find, if it exists, a group rid for the group name*/
 522         {
 523                 i++;
 524                 (*rid) = domain_group_rids[i].rid;
 525                 grp_name = domain_group_rids[i].name;
 526
 527         } while (grp_name != NULL && !strequal(grp_name, group_name));
 528
 529         return (grp_name != NULL) ? NT_STATUS_OK : NT_STATUS_NONE_MAPPED;
 530 }
 531
 532 /*******************************************************************
 533  Look up a local (BUILTIN) alias name and return a rid
 534  ********************************************************************/
 535 NTSTATUS local_lookup_alias_rid(const char *alias_name, uint32 *rid)
 536 {
 537         const char *als_name;
 538         int i = -1; /* start do loop at -1 */
 539
 540         do /* find, if it exists, a alias rid for the alias name*/
 541         {
 542                 i++;
 543                 (*rid) = builtin_alias_rids[i].rid;
 544                 als_name = builtin_alias_rids[i].name;
 545
 546         } while (als_name != NULL && !strequal(als_name, alias_name));
 547
 548         return (als_name != NULL) ? NT_STATUS_OK : NT_STATUS_NONE_MAPPED;
 549 }
 550
 551 /*******************************************************************
 552  Look up a local user name and return a rid
 553  ********************************************************************/
 554 NTSTATUS local_lookup_user_rid(char *user_name, uint32 *rid)
 555 {
 556         SAM_ACCOUNT *sampass=NULL;
 557         BOOL ret;
 558
 559         (*rid) = 0;
 560
 561         pdb_init_sam(&sampass);
 562
 563         /* find the user account */
 564         become_root();
 565         ret = pdb_getsampwnam(sampass, user_name);
 566         unbecome_root();
 567
 568         if (ret == True) {
 569                 (*rid) = pdb_get_user_rid(sampass);
 570                 pdb_free_sam(&sampass);
 571                 return NT_STATUS_OK;
 572         }
 573
 574         pdb_free_sam(&sampass);
 575         return NT_STATUS_NONE_MAPPED;
 576 }