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 #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_winbind_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         gid=pdb_get_gid(sam_pass);
 133
 134         become_root();
 135         /* on some systems this must run as root */
 136         num_groups = getgroups_user(user_name, &groups);
 137         unbecome_root();
 138         if (num_groups == -1) {
 139                 /* this should never happen */
 140                 DEBUG(2,("get_alias_user_groups: getgroups_user failed\n"));
 141                 pdb_free_sam(&sam_pass);
 142                 return NT_STATUS_UNSUCCESSFUL;
 143         }
 144
 145         for (i=0;i<num_groups;i++) {
 146                 if(!get_group_from_gid(groups[i], &map, MAPPING_WITHOUT_PRIV)) {
 147                         DEBUG(10,("get_alias_user_groups: gid %d. not found\n", (int)groups[i]));
 148                         continue;
 149                 }
 150
 151                 /* if it's not an alias, continue */
 152                 if (map.sid_name_use!=SID_NAME_ALIAS) {
 153                         DEBUG(10,("get_alias_user_groups: not returing %s, not an ALIAS group.\n", map.nt_name));
 154                         continue;
 155                 }
 156
 157                 sid_copy(&tmp_sid, &map.sid);
 158                 sid_split_rid(&tmp_sid, &rid);
 159
 160                 /* if the sid is not in the correct domain, continue */
 161                 if (!sid_equal(&tmp_sid, sid)) {
 162                         DEBUG(10,("get_alias_user_groups: not returing %s, not in the domain SID.\n", map.nt_name));
 163                         continue;
 164                 }
 165
 166                 /* Don't return winbind groups as they are not local! */
 167                 if (winbind_groups_exist && (groups[i] >= winbind_gid_low) && (groups[i] <= winbind_gid_high)) {
 168                         DEBUG(10,("get_alias_user_groups: not returing %s, not local.\n", map.nt_name));
 169                         continue;
 170                 }
 171
 172                 /* Don't return user private groups... */
 173                 if (Get_Pwnam(map.nt_name) != 0) {
 174                         DEBUG(10,("get_alias_user_groups: not returing %s, clashes with user.\n", map.nt_name));
 175                         continue;
 176                 }
 177
 178                 new_rids=(uint32 *)Realloc(rids, sizeof(uint32)*(cur_rid+1));
 179                 if (new_rids==NULL) {
 180                         DEBUG(10,("get_alias_user_groups: could not realloc memory\n"));
 181                         pdb_free_sam(&sam_pass);
 182                         free(groups);
 183                         return NT_STATUS_NO_MEMORY;
 184                 }
 185                 rids=new_rids;
 186
 187                 sid_peek_rid(&map.sid, &(rids[cur_rid]));
 188                 cur_rid++;
 189                 break;
 190         }
 191
 192         free(groups);
 193
 194         /* now check for the user's gid (the primary group rid) */
 195         for (i=0; i<cur_rid && grid!=rids[i]; i++)
 196                 ;
 197
 198         /* the user's gid is already there */
 199         if (i!=cur_rid) {
 200                 DEBUG(10,("get_alias_user_groups: user is already in the list. good.\n"));
 201                 goto done;
 202         }
 203
 204         DEBUG(10,("get_alias_user_groups: looking for gid %d of user %s\n", (int)gid, user_name));
 205
 206         if(!get_group_from_gid(gid, &map, MAPPING_WITHOUT_PRIV)) {
 207                 DEBUG(0,("get_alias_user_groups: gid of user %s doesn't exist. Check your /etc/passwd and /etc/group files\n", user_name));
 208                 goto done;
 209         }
 210
 211         /* the primary group isn't an alias */
 212         if (map.sid_name_use!=SID_NAME_ALIAS) {
 213                 DEBUG(10,("get_alias_user_groups: not returing %s, not an ALIAS group.\n", map.nt_name));
 214                 goto done;
 215         }
 216
 217         sid_copy(&tmp_sid, &map.sid);
 218         sid_split_rid(&tmp_sid, &rid);
 219
 220         /* if the sid is not in the correct domain, continue */
 221         if (!sid_equal(&tmp_sid, sid)) {
 222                 DEBUG(10,("get_alias_user_groups: not returing %s, not in the domain SID.\n", map.nt_name));
 223                 goto done;
 224         }
 225
 226         /* Don't return winbind groups as they are not local! */
 227         if (winbind_groups_exist && (gid >= winbind_gid_low) && (gid <= winbind_gid_high)) {
 228                 DEBUG(10,("get_alias_user_groups: not returing %s, not local.\n", map.nt_name ));
 229                 goto done;
 230         }
 231
 232         /* Don't return user private groups... */
 233         if (Get_Pwnam(map.nt_name) != 0) {
 234                 DEBUG(10,("get_alias_user_groups: not returing %s, clashes with user.\n", map.nt_name ));
 235                 goto done;
 236         }
 237
 238         new_rids=(uint32 *)Realloc(rids, sizeof(uint32)*(cur_rid+1));
 239         if (new_rids==NULL) {
 240                 DEBUG(10,("get_alias_user_groups: could not realloc memory\n"));
 241                 pdb_free_sam(&sam_pass);
 242                 return NT_STATUS_NO_MEMORY;
 243         }
 244         rids=new_rids;
 245
 246         sid_peek_rid(&map.sid, &(rids[cur_rid]));
 247         cur_rid++;
 248
 249 done:
 250         *prids=rids;
 251         *numgroups=cur_rid;
 252         pdb_free_sam(&sam_pass);
 253
 254         return NT_STATUS_OK;
 255 }
 256
 257
 258 /*******************************************************************
 259  gets a domain user's groups
 260  ********************************************************************/
 261 BOOL get_domain_user_groups(TALLOC_CTX *ctx, int *numgroups, DOM_GID **pgids, SAM_ACCOUNT *sam_pass)
 262 {
 263         GROUP_MAP *map=NULL;
 264         int i, num, num_entries, cur_gid=0;
 265         struct group *grp;
 266         DOM_GID *gids;
 267         fstring user_name;
 268         uint32 grid;
 269         uint32 tmp_rid;
 270
 271         *numgroups= 0;
 272
 273         fstrcpy(user_name, pdb_get_username(sam_pass));
 274         grid=pdb_get_group_rid(sam_pass);
 275
 276         DEBUG(10,("get_domain_user_groups: searching domain groups [%s] is a member of\n", user_name));
 277
 278         /* first get the list of the domain groups */
 279         if (!pdb_enum_group_mapping(SID_NAME_DOM_GRP, &map, &num_entries, ENUM_ONLY_MAPPED, MAPPING_WITHOUT_PRIV))
 280                 return False;
 281         DEBUG(10,("get_domain_user_groups: there are %d mapped groups\n", num_entries));
 282
 283         /*
 284          * alloc memory. In the worse case, we alloc memory for nothing.
 285          * but I prefer to alloc for nothing
 286          * than reallocing everytime.
 287          */
 288         gids = (DOM_GID *)talloc(ctx, sizeof(DOM_GID) *  num_entries);
 289
 290         /* for each group, check if the user is a member of*/
 291         for(i=0; i<num_entries; i++) {
 292                 if ((grp=getgrgid(map[i].gid)) == NULL) {
 293                         /* very weird !!! */
 294                         DEBUG(5,("get_domain_user_groups: gid %d doesn't exist anymore !\n", (int)map[i].gid));
 295                         continue;
 296                 }
 297
 298                 for(num=0; grp->gr_mem[num]!=NULL; num++) {
 299                         if(strcmp(grp->gr_mem[num], user_name)==0) {
 300                                 /* we found the user, add the group to the list */
 301                                 sid_peek_rid(&map[i].sid, &(gids[cur_gid].g_rid));
 302                                 gids[cur_gid].attr=7;
 303                                 DEBUG(10,("get_domain_user_groups: user found in group %s\n", map[i].nt_name));
 304                                 cur_gid++;
 305                                 break;
 306                         }
 307                 }
 308         }
 309
 310         /* we have checked the groups */
 311         /* we must now check the gid of the user or the primary group rid, that's the same */
 312         for (i=0; i<cur_gid && grid!=gids[i].g_rid; i++)
 313                 ;
 314
 315         /* the user's gid is already there */
 316         if (i!=cur_gid) {
 317                 /*
 318                  * the primary group of the user but be the first one in the list
 319                  * don't ask ! JFM.
 320                  */
 321                 gids[i].g_rid=gids[0].g_rid;
 322                 gids[0].g_rid=grid;
 323                 goto done;
 324         }
 325
 326         for(i=0; i<num_entries; i++) {
 327                 sid_peek_rid(&map[i].sid, &tmp_rid);
 328                 if (tmp_rid==grid) {
 329                         /*
 330                          * the primary group of the user but be the first one in the list
 331                          * don't ask ! JFM.
 332                          */
 333                         gids[cur_gid].g_rid=gids[0].g_rid;
 334                         gids[0].g_rid=tmp_rid;
 335                         gids[cur_gid].attr=7;
 336                         DEBUG(10,("get_domain_user_groups: primary gid of user found in group %s\n", map[i].nt_name));
 337                         cur_gid++;
 338                         goto done; /* leave the loop early */
 339                 }
 340         }
 341
 342         DEBUG(0,("get_domain_user_groups: primary gid of user [%s] is not a Domain group !\n", user_name));
 343         DEBUGADD(0,("get_domain_user_groups: You should fix it, NT doesn't like that\n"));
 344
 345  done:
 346         *pgids=gids;
 347         *numgroups=cur_gid;
 348         safe_free(map);
 349
 350         return True;
 351 }
 352
 353 /*******************************************************************
 354  Look up a local (domain) rid and return a name and type.
 355  ********************************************************************/
 356 NTSTATUS local_lookup_group_name(uint32 rid, char *group_name, uint32 *type)
 357 {
 358         int i = 0;
 359         (*type) = SID_NAME_DOM_GRP;
 360
 361         DEBUG(5,("lookup_group_name: rid: %d", rid));
 362
 363         while (domain_group_rids[i].rid != rid && domain_group_rids[i].rid != 0)
 364         {
 365                 i++;
 366         }
 367
 368         if (domain_group_rids[i].rid != 0)
 369         {
 370                 fstrcpy(group_name, domain_group_rids[i].name);
 371                 DEBUG(5,(" = %s\n", group_name));
 372                 return NT_STATUS_OK;
 373         }
 374
 375         DEBUG(5,(" none mapped\n"));
 376         return NT_STATUS_NONE_MAPPED;
 377 }
 378
 379 /*******************************************************************
 380  Look up a local alias rid and return a name and type.
 381  ********************************************************************/
 382 NTSTATUS local_lookup_alias_name(uint32 rid, char *alias_name, uint32 *type)
 383 {
 384         int i = 0;
 385         (*type) = SID_NAME_WKN_GRP;
 386
 387         DEBUG(5,("lookup_alias_name: rid: %d", rid));
 388
 389         while (builtin_alias_rids[i].rid != rid && builtin_alias_rids[i].rid != 0)
 390         {
 391                 i++;
 392         }
 393
 394         if (builtin_alias_rids[i].rid != 0)
 395         {
 396                 fstrcpy(alias_name, builtin_alias_rids[i].name);
 397                 DEBUG(5,(" = %s\n", alias_name));
 398                 return NT_STATUS_OK;
 399         }
 400
 401         DEBUG(5,(" none mapped\n"));
 402         return NT_STATUS_NONE_MAPPED;
 403 }
 404
 405
 406 #if 0 /*Nobody uses this function just now*/
 407 /*******************************************************************
 408  Look up a local user rid and return a name and type.
 409  ********************************************************************/
 410 NTSTATUS local_lookup_user_name(uint32 rid, char *user_name, uint32 *type)
 411 {
 412         SAM_ACCOUNT *sampwd=NULL;
 413         int i = 0;
 414         BOOL ret;
 415
 416         (*type) = SID_NAME_USER;
 417
 418         DEBUG(5,("lookup_user_name: rid: %d", rid));
 419
 420         /* look up the well-known domain user rids first */
 421         while (domain_user_rids[i].rid != rid && domain_user_rids[i].rid != 0)
 422         {
 423                 i++;
 424         }
 425
 426         if (domain_user_rids[i].rid != 0) {
 427                 fstrcpy(user_name, domain_user_rids[i].name);
 428                 DEBUG(5,(" = %s\n", user_name));
 429                 return NT_STATUS_OK;
 430         }
 431
 432         pdb_init_sam(&sampwd);
 433
 434         /* ok, it's a user.  find the user account */
 435         become_root();
 436         ret = pdb_getsampwrid(sampwd, rid);
 437         unbecome_root();
 438
 439         if (ret == True) {
 440                 fstrcpy(user_name, pdb_get_username(sampwd) );
 441                 DEBUG(5,(" = %s\n", user_name));
 442                 pdb_free_sam(&sampwd);
 443                 return NT_STATUS_OK;
 444         }
 445
 446         DEBUG(5,(" none mapped\n"));
 447         pdb_free_sam(&sampwd);
 448         return NT_STATUS_NONE_MAPPED;
 449 }
 450
 451 #endif
 452
 453 /*******************************************************************
 454  Look up a local (domain) group name and return a rid
 455  ********************************************************************/
 456 NTSTATUS local_lookup_group_rid(char *group_name, uint32 *rid)
 457 {
 458         const char *grp_name;
 459         int i = -1; /* start do loop at -1 */
 460
 461         do /* find, if it exists, a group rid for the group name*/
 462         {
 463                 i++;
 464                 (*rid) = domain_group_rids[i].rid;
 465                 grp_name = domain_group_rids[i].name;
 466
 467         } while (grp_name != NULL && !strequal(grp_name, group_name));
 468
 469         return (grp_name != NULL) ? NT_STATUS_OK : NT_STATUS_NONE_MAPPED;
 470 }
 471
 472 /*******************************************************************
 473  Look up a local (BUILTIN) alias name and return a rid
 474  ********************************************************************/
 475 NTSTATUS local_lookup_alias_rid(const char *alias_name, uint32 *rid)
 476 {
 477         const char *als_name;
 478         int i = -1; /* start do loop at -1 */
 479
 480         do /* find, if it exists, a alias rid for the alias name*/
 481         {
 482                 i++;
 483                 (*rid) = builtin_alias_rids[i].rid;
 484                 als_name = builtin_alias_rids[i].name;
 485
 486         } while (als_name != NULL && !strequal(als_name, alias_name));
 487
 488         return (als_name != NULL) ? NT_STATUS_OK : NT_STATUS_NONE_MAPPED;
 489 }
 490
 491 /*******************************************************************
 492  Look up a local user name and return a rid
 493  ********************************************************************/
 494 NTSTATUS local_lookup_user_rid(char *user_name, uint32 *rid)
 495 {
 496         SAM_ACCOUNT *sampass=NULL;
 497         BOOL ret;
 498
 499         (*rid) = 0;
 500
 501         pdb_init_sam(&sampass);
 502
 503         /* find the user account */
 504         become_root();
 505         ret = pdb_getsampwnam(sampass, user_name);
 506         unbecome_root();
 507
 508         if (ret == True) {
 509                 (*rid) = pdb_get_user_rid(sampass);
 510                 pdb_free_sam(&sampass);
 511                 return NT_STATUS_OK;
 512         }
 513
 514         pdb_free_sam(&sampass);
 515         return NT_STATUS_NONE_MAPPED;
 516 }