source/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 /*
  42  * A list of the rids of well known BUILTIN and Domain users
  43  * and groups.
  44  */
  45
  46 rid_name builtin_alias_rids[] =
  47 {
  48     { BUILTIN_ALIAS_RID_ADMINS       , "Administrators" },
  49     { BUILTIN_ALIAS_RID_USERS        , "Users" },
  50     { BUILTIN_ALIAS_RID_GUESTS       , "Guests" },
  51     { BUILTIN_ALIAS_RID_POWER_USERS  , "Power Users" },
  52
  53     { BUILTIN_ALIAS_RID_ACCOUNT_OPS  , "Account Operators" },
  54     { BUILTIN_ALIAS_RID_SYSTEM_OPS   , "System Operators" },
  55     { BUILTIN_ALIAS_RID_PRINT_OPS    , "Print Operators" },
  56     { BUILTIN_ALIAS_RID_BACKUP_OPS   , "Backup Operators" },
  57     { BUILTIN_ALIAS_RID_REPLICATOR   , "Replicator" },
  58     { 0                             , NULL }
  59 };
  60
  61 /* array lookup of well-known Domain RID users. */
  62 rid_name domain_user_rids[] =
  63 {
  64     { DOMAIN_USER_RID_ADMIN         , "Administrator" },
  65     { DOMAIN_USER_RID_GUEST         , "Guest" },
  66     { 0                             , NULL }
  67 };
  68
  69 /* array lookup of well-known Domain RID groups. */
  70 rid_name domain_group_rids[] =
  71 {
  72     { DOMAIN_GROUP_RID_ADMINS       , "Domain Admins" },
  73     { DOMAIN_GROUP_RID_USERS        , "Domain Users" },
  74     { DOMAIN_GROUP_RID_GUESTS       , "Domain Guests" },
  75     { 0                             , NULL }
  76 };
  77
  78 /*******************************************************************
  79  gets a domain user's groups
  80  ********************************************************************/
  81 NTSTATUS get_alias_user_groups(TALLOC_CTX *ctx, DOM_SID *sid, int *numgroups, uint32 **prids, DOM_SID *q_sid)
  82 {
  83         SAM_ACCOUNT *sam_pass=NULL;
  84         struct sys_grent *glist;
  85         struct sys_grent *grp;
  86         int i, num, cur_rid=0;
  87         gid_t gid;
  88         GROUP_MAP map;
  89         DOM_SID tmp_sid;
  90         fstring user_name;
  91         fstring str_domsid, str_qsid;
  92         uint32 rid,grid;
  93         uint32 *rids=NULL, *new_rids=NULL;
  94         gid_t winbind_gid_low, winbind_gid_high;
  95         BOOL ret;
  96         BOOL winbind_groups_exist;
  97
  98         /*
  99          * this code is far from perfect.
 100          * first it enumerates the full /etc/group and that can be slow.
 101          * second, it works only with users' SIDs
 102          * whereas the day we support nested groups, it will have to
 103          * support both users's SIDs and domain groups' SIDs
 104          *
 105          * having our own ldap backend would be so much faster !
 106          * we're far from that, but hope one day ;-) JFM.
 107          */
 108
 109         *prids=NULL;
 110         *numgroups=0;
 111
 112         winbind_groups_exist = lp_winbind_gid(&winbind_gid_low, &winbind_gid_high);
 113
 114
 115         DEBUG(10,("get_alias_user_groups: looking if SID %s is a member of groups in the SID domain %s\n",
 116                   sid_to_string(str_qsid, q_sid), sid_to_string(str_domsid, sid)));
 117
 118         pdb_init_sam(&sam_pass);
 119         become_root();
 120         ret = pdb_getsampwsid(sam_pass, q_sid);
 121         unbecome_root();
 122         if (ret == False) {
 123                 pdb_free_sam(&sam_pass);
 124                 return NT_STATUS_NO_SUCH_USER;
 125         }
 126
 127         fstrcpy(user_name, pdb_get_username(sam_pass));
 128         grid=pdb_get_group_rid(sam_pass);
 129         gid=pdb_get_gid(sam_pass);
 130
 131         grp = glist = getgrent_list();
 132         if (grp == NULL) {
 133                 pdb_free_sam(&sam_pass);
 134                 return NT_STATUS_NO_MEMORY;
 135         }
 136
 137         for (; grp != NULL; grp = grp->next) {
 138                 if(!get_group_from_gid(grp->gr_gid, &map, MAPPING_WITHOUT_PRIV)) {
 139                         DEBUG(10,("get_alias_user_groups: gid %d. not found\n", (int)grp->gr_gid));
 140                         continue;
 141                 }
 142
 143                 /* if it's not an alias, continue */
 144                 if (map.sid_name_use!=SID_NAME_ALIAS) {
 145                         DEBUG(10,("get_alias_user_groups: not returing %s, not an ALIAS group.\n", map.nt_name));
 146                         continue;
 147                 }
 148
 149                 sid_copy(&tmp_sid, &map.sid);
 150                 sid_split_rid(&tmp_sid, &rid);
 151
 152                 /* if the sid is not in the correct domain, continue */
 153                 if (!sid_equal(&tmp_sid, sid)) {
 154                         DEBUG(10,("get_alias_user_groups: not returing %s, not in the domain SID.\n", map.nt_name));
 155                         continue;
 156                 }
 157
 158                 /* Don't return winbind groups as they are not local! */
 159                 if (winbind_groups_exist && (grp->gr_gid >= winbind_gid_low) && (grp->gr_gid <= winbind_gid_high)) {
 160                         DEBUG(10,("get_alias_user_groups: not returing %s, not local.\n", map.nt_name));
 161                         continue;
 162                 }
 163
 164                 /* Don't return user private groups... */
 165                 if (Get_Pwnam(map.nt_name) != 0) {
 166                         DEBUG(10,("get_alias_user_groups: not returing %s, clashes with user.\n", map.nt_name));
 167                         continue;
 168                 }
 169
 170                 /* the group is fine, we can check if there is the user we're looking for */
 171                 DEBUG(10,("get_alias_user_groups: checking if the user is a member of %s.\n", map.nt_name));
 172
 173                 for(num=0; grp->gr_mem[num]!=NULL; num++) {
 174                         if(strcmp(grp->gr_mem[num], user_name)==0) {
 175                                 /* we found the user, add the group to the list */
 176
 177                                 new_rids=(uint32 *)Realloc(rids, sizeof(uint32)*(cur_rid+1));
 178                                 if (new_rids==NULL) {
 179                                         DEBUG(10,("get_alias_user_groups: could not realloc memory\n"));
 180                                         pdb_free_sam(&sam_pass);
 181                                         return NT_STATUS_NO_MEMORY;
 182                                 }
 183                                 rids=new_rids;
 184
 185                                 sid_peek_rid(&map.sid, &(rids[cur_rid]));
 186                                 DEBUG(10,("get_alias_user_groups: user found in group %s\n", map.nt_name));
 187                                 cur_rid++;
 188                                 break;
 189                         }
 190                 }
 191         }
 192
 193         grent_free(glist);
 194
 195         /* now check for the user's gid (the primary group rid) */
 196         for (i=0; i<cur_rid && grid!=rids[i]; i++)
 197                 ;
 198
 199         /* the user's gid is already there */
 200         if (i!=cur_rid) {
 201                 DEBUG(10,("get_alias_user_groups: user is already in the list. good.\n"));
 202                 goto done;
 203         }
 204
 205         DEBUG(10,("get_alias_user_groups: looking for gid %d of user %s\n", (int)gid, user_name));
 206
 207         if(!get_group_from_gid(gid, &map, MAPPING_WITHOUT_PRIV)) {
 208                 DEBUG(0,("get_alias_user_groups: gid of user %s doesn't exist. Check your /etc/passwd and /etc/group files\n", user_name));
 209                 goto done;
 210         }
 211
 212         /* the primary group isn't an alias */
 213         if (map.sid_name_use!=SID_NAME_ALIAS) {
 214                 DEBUG(10,("get_alias_user_groups: not returing %s, not an ALIAS group.\n", map.nt_name));
 215                 goto done;
 216         }
 217
 218         sid_copy(&tmp_sid, &map.sid);
 219         sid_split_rid(&tmp_sid, &rid);
 220
 221         /* if the sid is not in the correct domain, continue */
 222         if (!sid_equal(&tmp_sid, sid)) {
 223                 DEBUG(10,("get_alias_user_groups: not returing %s, not in the domain SID.\n", map.nt_name));
 224                 goto done;
 225         }
 226
 227         /* Don't return winbind groups as they are not local! */
 228         if (winbind_groups_exist && (gid >= winbind_gid_low) && (gid <= winbind_gid_high)) {
 229                 DEBUG(10,("get_alias_user_groups: not returing %s, not local.\n", map.nt_name ));
 230                 goto done;
 231         }
 232
 233         /* Don't return user private groups... */
 234         if (Get_Pwnam(map.nt_name) != 0) {
 235                 DEBUG(10,("get_alias_user_groups: not returing %s, clashes with user.\n", map.nt_name ));
 236                 goto done;
 237         }
 238
 239         new_rids=(uint32 *)Realloc(rids, sizeof(uint32)*(cur_rid+1));
 240         if (new_rids==NULL) {
 241                 DEBUG(10,("get_alias_user_groups: could not realloc memory\n"));
 242                 pdb_free_sam(&sam_pass);
 243                 return NT_STATUS_NO_MEMORY;
 244         }
 245         rids=new_rids;
 246
 247         sid_peek_rid(&map.sid, &(rids[cur_rid]));
 248         cur_rid++;
 249
 250 done:
 251         *prids=rids;
 252         *numgroups=cur_rid;
 253         pdb_free_sam(&sam_pass);
 254
 255         return NT_STATUS_OK;
 256 }
 257
 258
 259 /*******************************************************************
 260  gets a domain user's groups
 261  ********************************************************************/
 262 BOOL get_domain_user_groups(TALLOC_CTX *ctx, int *numgroups, DOM_GID **pgids, SAM_ACCOUNT *sam_pass)
 263 {
 264         GROUP_MAP *map=NULL;
 265         int i, num, num_entries, cur_gid=0;
 266         struct group *grp;
 267         DOM_GID *gids;
 268         fstring user_name;
 269         uint32 grid;
 270         uint32 tmp_rid;
 271
 272         *numgroups= 0;
 273
 274         fstrcpy(user_name, pdb_get_username(sam_pass));
 275         grid=pdb_get_group_rid(sam_pass);
 276
 277         DEBUG(10,("get_domain_user_groups: searching domain groups [%s] is a member of\n", user_name));
 278
 279         /* first get the list of the domain groups */
 280         if (!enum_group_mapping(SID_NAME_DOM_GRP, &map, &num_entries, ENUM_ONLY_MAPPED, MAPPING_WITHOUT_PRIV))
 281                 return False;
 282         DEBUG(10,("get_domain_user_groups: there are %d mapped groups\n", num_entries));
 283
 284         /*
 285          * alloc memory. In the worse case, we alloc memory for nothing.
 286          * but I prefer to alloc for nothing
 287          * than reallocing everytime.
 288          */
 289         gids = (DOM_GID *)talloc(ctx, sizeof(DOM_GID) *  num_entries);
 290
 291         /* for each group, check if the user is a member of*/
 292         for(i=0; i<num_entries; i++) {
 293                 if ((grp=getgrgid(map[i].gid)) == NULL) {
 294                         /* very weird !!! */
 295                         DEBUG(5,("get_domain_user_groups: gid %d doesn't exist anymore !\n", (int)map[i].gid));
 296                         continue;
 297                 }
 298
 299                 for(num=0; grp->gr_mem[num]!=NULL; num++) {
 300                         if(strcmp(grp->gr_mem[num], user_name)==0) {
 301                                 /* we found the user, add the group to the list */
 302                                 sid_peek_rid(&map[i].sid, &(gids[cur_gid].g_rid));
 303                                 gids[cur_gid].attr=7;
 304                                 DEBUG(10,("get_domain_user_groups: user found in group %s\n", map[i].nt_name));
 305                                 cur_gid++;
 306                                 break;
 307                         }
 308                 }
 309         }
 310
 311         /* we have checked the groups */
 312         /* we must now check the gid of the user or the primary group rid, that's the same */
 313         for (i=0; i<cur_gid && grid!=gids[i].g_rid; i++)
 314                 ;
 315
 316         /* the user's gid is already there */
 317         if (i!=cur_gid) {
 318                 /*
 319                  * the primary group of the user but be the first one in the list
 320                  * don't ask ! JFM.
 321                  */
 322                 gids[i].g_rid=gids[0].g_rid;
 323                 gids[0].g_rid=grid;
 324                 goto done;
 325         }
 326
 327         for(i=0; i<num_entries; i++) {
 328                 sid_peek_rid(&map[i].sid, &tmp_rid);
 329                 if (tmp_rid==grid) {
 330                         /*
 331                          * the primary group of the user but be the first one in the list
 332                          * don't ask ! JFM.
 333                          */
 334                         gids[cur_gid].g_rid=gids[0].g_rid;
 335                         gids[0].g_rid=tmp_rid;
 336                         gids[cur_gid].attr=7;
 337                         DEBUG(10,("get_domain_user_groups: primary gid of user found in group %s\n", map[i].nt_name));
 338                         cur_gid++;
 339                         goto done; /* leave the loop early */
 340                 }
 341         }
 342
 343         DEBUG(0,("get_domain_user_groups: primary gid of user [%s] is not a Domain group !\n", user_name));
 344         DEBUGADD(0,("get_domain_user_groups: You should fix it, NT doesn't like that\n"));
 345
 346  done:
 347         *pgids=gids;
 348         *numgroups=cur_gid;
 349         safe_free(map);
 350
 351         return True;
 352 }
 353
 354 /*******************************************************************
 355  Look up a local (domain) rid and return a name and type.
 356  ********************************************************************/
 357 NTSTATUS local_lookup_group_name(uint32 rid, char *group_name, uint32 *type)
 358 {
 359         int i = 0;
 360         (*type) = SID_NAME_DOM_GRP;
 361
 362         DEBUG(5,("lookup_group_name: rid: %d", rid));
 363
 364         while (domain_group_rids[i].rid != rid && domain_group_rids[i].rid != 0)
 365         {
 366                 i++;
 367         }
 368
 369         if (domain_group_rids[i].rid != 0)
 370         {
 371                 fstrcpy(group_name, domain_group_rids[i].name);
 372                 DEBUG(5,(" = %s\n", group_name));
 373                 return NT_STATUS_OK;
 374         }
 375
 376         DEBUG(5,(" none mapped\n"));
 377         return NT_STATUS_NONE_MAPPED;
 378 }
 379
 380 /*******************************************************************
 381  Look up a local alias rid and return a name and type.
 382  ********************************************************************/
 383 NTSTATUS local_lookup_alias_name(uint32 rid, char *alias_name, uint32 *type)
 384 {
 385         int i = 0;
 386         (*type) = SID_NAME_WKN_GRP;
 387
 388         DEBUG(5,("lookup_alias_name: rid: %d", rid));
 389
 390         while (builtin_alias_rids[i].rid != rid && builtin_alias_rids[i].rid != 0)
 391         {
 392                 i++;
 393         }
 394
 395         if (builtin_alias_rids[i].rid != 0)
 396         {
 397                 fstrcpy(alias_name, builtin_alias_rids[i].name);
 398                 DEBUG(5,(" = %s\n", alias_name));
 399                 return NT_STATUS_OK;
 400         }
 401
 402         DEBUG(5,(" none mapped\n"));
 403         return NT_STATUS_NONE_MAPPED;
 404 }
 405
 406
 407 #if 0 /*Nobody uses this function just now*/
 408 /*******************************************************************
 409  Look up a local user rid and return a name and type.
 410  ********************************************************************/
 411 NTSTATUS local_lookup_user_name(uint32 rid, char *user_name, uint32 *type)
 412 {
 413         SAM_ACCOUNT *sampwd=NULL;
 414         int i = 0;
 415         BOOL ret;
 416
 417         (*type) = SID_NAME_USER;
 418
 419         DEBUG(5,("lookup_user_name: rid: %d", rid));
 420
 421         /* look up the well-known domain user rids first */
 422         while (domain_user_rids[i].rid != rid && domain_user_rids[i].rid != 0)
 423         {
 424                 i++;
 425         }
 426
 427         if (domain_user_rids[i].rid != 0) {
 428                 fstrcpy(user_name, domain_user_rids[i].name);
 429                 DEBUG(5,(" = %s\n", user_name));
 430                 return NT_STATUS_OK;
 431         }
 432
 433         pdb_init_sam(&sampwd);
 434
 435         /* ok, it's a user.  find the user account */
 436         become_root();
 437         ret = pdb_getsampwrid(sampwd, rid);
 438         unbecome_root();
 439
 440         if (ret == True) {
 441                 fstrcpy(user_name, pdb_get_username(sampwd) );
 442                 DEBUG(5,(" = %s\n", user_name));
 443                 pdb_free_sam(&sampwd);
 444                 return NT_STATUS_OK;
 445         }
 446
 447         DEBUG(5,(" none mapped\n"));
 448         pdb_free_sam(&sampwd);
 449         return NT_STATUS_NONE_MAPPED;
 450 }
 451
 452 #endif
 453
 454 /*******************************************************************
 455  Look up a local (domain) group name and return a rid
 456  ********************************************************************/
 457 NTSTATUS local_lookup_group_rid(char *group_name, uint32 *rid)
 458 {
 459         char *grp_name;
 460         int i = -1; /* start do loop at -1 */
 461
 462         do /* find, if it exists, a group rid for the group name*/
 463         {
 464                 i++;
 465                 (*rid) = domain_group_rids[i].rid;
 466                 grp_name = domain_group_rids[i].name;
 467
 468         } while (grp_name != NULL && !strequal(grp_name, group_name));
 469
 470         return (grp_name != NULL) ? NT_STATUS_OK : NT_STATUS_NONE_MAPPED;
 471 }
 472
 473 /*******************************************************************
 474  Look up a local (BUILTIN) alias name and return a rid
 475  ********************************************************************/
 476 NTSTATUS local_lookup_alias_rid(char *alias_name, uint32 *rid)
 477 {
 478         char *als_name;
 479         int i = -1; /* start do loop at -1 */
 480
 481         do /* find, if it exists, a alias rid for the alias name*/
 482         {
 483                 i++;
 484                 (*rid) = builtin_alias_rids[i].rid;
 485                 als_name = builtin_alias_rids[i].name;
 486
 487         } while (als_name != NULL && !strequal(als_name, alias_name));
 488
 489         return (als_name != NULL) ? NT_STATUS_OK : NT_STATUS_NONE_MAPPED;
 490 }
 491
 492 /*******************************************************************
 493  Look up a local user name and return a rid
 494  ********************************************************************/
 495 NTSTATUS local_lookup_user_rid(char *user_name, uint32 *rid)
 496 {
 497         SAM_ACCOUNT *sampass=NULL;
 498         BOOL ret;
 499
 500         (*rid) = 0;
 501
 502         pdb_init_sam(&sampass);
 503
 504         /* find the user account */
 505         become_root();
 506         ret = pdb_getsampwnam(sampass, user_name);
 507         unbecome_root();
 508
 509         if (ret == True) {
 510                 (*rid) = pdb_get_user_rid(sampass);
 511                 pdb_free_sam(&sampass);
 512                 return NT_STATUS_OK;
 513         }
 514
 515         pdb_free_sam(&sampass);
 516         return NT_STATUS_NONE_MAPPED;
 517 }