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_ERR(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                 if(!get_group_from_gid(groups[i], &map, MAPPING_WITHOUT_PRIV)) {
 152                         DEBUG(10,("get_alias_user_groups: gid %d. not found\n", (int)groups[i]));
 153                         continue;
 154                 }
 155
 156                 /* if it's not an alias, continue */
 157                 if (map.sid_name_use!=SID_NAME_ALIAS) {
 158                         DEBUG(10,("get_alias_user_groups: not returing %s, not an ALIAS group.\n", map.nt_name));
 159                         continue;
 160                 }
 161
 162                 sid_copy(&tmp_sid, &map.sid);
 163                 sid_split_rid(&tmp_sid, &rid);
 164
 165                 /* if the sid is not in the correct domain, continue */
 166                 if (!sid_equal(&tmp_sid, sid)) {
 167                         DEBUG(10,("get_alias_user_groups: not returing %s, not in the domain SID.\n", map.nt_name));
 168                         continue;
 169                 }
 170
 171                 /* Don't return winbind groups as they are not local! */
 172                 if (winbind_groups_exist && (groups[i] >= winbind_gid_low) && (groups[i] <= winbind_gid_high)) {
 173                         DEBUG(10,("get_alias_user_groups: not returing %s, not local.\n", map.nt_name));
 174                         continue;
 175                 }
 176
 177                 /* Don't return user private groups... */
 178                 if (Get_Pwnam(map.nt_name) != 0) {
 179                         DEBUG(10,("get_alias_user_groups: not returing %s, clashes with user.\n", map.nt_name));
 180                         continue;
 181                 }
 182
 183                 new_rids=(uint32 *)Realloc(rids, sizeof(uint32)*(cur_rid+1));
 184                 if (new_rids==NULL) {
 185                         DEBUG(10,("get_alias_user_groups: could not realloc memory\n"));
 186                         pdb_free_sam(&sam_pass);
 187                         free(groups);
 188                         return NT_STATUS_NO_MEMORY;
 189                 }
 190                 rids=new_rids;
 191
 192                 sid_peek_rid(&map.sid, &(rids[cur_rid]));
 193                 cur_rid++;
 194                 break;
 195         }
 196
 197         free(groups);
 198
 199         /* now check for the user's gid (the primary group rid) */
 200         for (i=0; i<cur_rid && grid!=rids[i]; i++)
 201                 ;
 202
 203         /* the user's gid is already there */
 204         if (i!=cur_rid) {
 205                 DEBUG(10,("get_alias_user_groups: user is already in the list. good.\n"));
 206                 goto done;
 207         }
 208
 209         DEBUG(10,("get_alias_user_groups: looking for gid %d of user %s\n", (int)gid, user_name));
 210
 211         if(!get_group_from_gid(gid, &map, MAPPING_WITHOUT_PRIV)) {
 212                 DEBUG(0,("get_alias_user_groups: gid of user %s doesn't exist. Check your /etc/passwd and /etc/group files\n", user_name));
 213                 goto done;
 214         }
 215
 216         /* the primary group isn't an alias */
 217         if (map.sid_name_use!=SID_NAME_ALIAS) {
 218                 DEBUG(10,("get_alias_user_groups: not returing %s, not an ALIAS group.\n", map.nt_name));
 219                 goto done;
 220         }
 221
 222         sid_copy(&tmp_sid, &map.sid);
 223         sid_split_rid(&tmp_sid, &rid);
 224
 225         /* if the sid is not in the correct domain, continue */
 226         if (!sid_equal(&tmp_sid, sid)) {
 227                 DEBUG(10,("get_alias_user_groups: not returing %s, not in the domain SID.\n", map.nt_name));
 228                 goto done;
 229         }
 230
 231         /* Don't return winbind groups as they are not local! */
 232         if (winbind_groups_exist && (gid >= winbind_gid_low) && (gid <= winbind_gid_high)) {
 233                 DEBUG(10,("get_alias_user_groups: not returing %s, not local.\n", map.nt_name ));
 234                 goto done;
 235         }
 236
 237         /* Don't return user private groups... */
 238         if (Get_Pwnam(map.nt_name) != 0) {
 239                 DEBUG(10,("get_alias_user_groups: not returing %s, clashes with user.\n", map.nt_name ));
 240                 goto done;
 241         }
 242
 243         new_rids=(uint32 *)Realloc(rids, sizeof(uint32)*(cur_rid+1));
 244         if (new_rids==NULL) {
 245                 DEBUG(10,("get_alias_user_groups: could not realloc memory\n"));
 246                 pdb_free_sam(&sam_pass);
 247                 return NT_STATUS_NO_MEMORY;
 248         }
 249         rids=new_rids;
 250
 251         sid_peek_rid(&map.sid, &(rids[cur_rid]));
 252         cur_rid++;
 253
 254 done:
 255         *prids=rids;
 256         *numgroups=cur_rid;
 257         pdb_free_sam(&sam_pass);
 258
 259         return NT_STATUS_OK;
 260 }
 261
 262
 263 /*******************************************************************
 264  gets a domain user's groups
 265  ********************************************************************/
 266 BOOL get_domain_user_groups(TALLOC_CTX *ctx, int *numgroups, DOM_GID **pgids, SAM_ACCOUNT *sam_pass)
 267 {
 268         GROUP_MAP *map=NULL;
 269         int i, num, num_entries, cur_gid=0;
 270         struct group *grp;
 271         DOM_GID *gids;
 272         fstring user_name;
 273         uint32 grid;
 274         uint32 tmp_rid;
 275
 276         *numgroups= 0;
 277
 278         fstrcpy(user_name, pdb_get_username(sam_pass));
 279         grid=pdb_get_group_rid(sam_pass);
 280
 281         DEBUG(10,("get_domain_user_groups: searching domain groups [%s] is a member of\n", user_name));
 282
 283         /* first get the list of the domain groups */
 284         if (!pdb_enum_group_mapping(SID_NAME_DOM_GRP, &map, &num_entries, ENUM_ONLY_MAPPED, MAPPING_WITHOUT_PRIV))
 285                 return False;
 286         DEBUG(10,("get_domain_user_groups: there are %d mapped groups\n", num_entries));
 287
 288         /*
 289          * alloc memory. In the worse case, we alloc memory for nothing.
 290          * but I prefer to alloc for nothing
 291          * than reallocing everytime.
 292          */
 293         gids = (DOM_GID *)talloc(ctx, sizeof(DOM_GID) *  num_entries);
 294
 295         /* for each group, check if the user is a member of*/
 296         for(i=0; i<num_entries; i++) {
 297                 if ((grp=getgrgid(map[i].gid)) == NULL) {
 298                         /* very weird !!! */
 299                         DEBUG(5,("get_domain_user_groups: gid %d doesn't exist anymore !\n", (int)map[i].gid));
 300                         continue;
 301                 }
 302
 303                 for(num=0; grp->gr_mem[num]!=NULL; num++) {
 304                         if(strcmp(grp->gr_mem[num], user_name)==0) {
 305                                 /* we found the user, add the group to the list */
 306                                 sid_peek_rid(&map[i].sid, &(gids[cur_gid].g_rid));
 307                                 gids[cur_gid].attr=7;
 308                                 DEBUG(10,("get_domain_user_groups: user found in group %s\n", map[i].nt_name));
 309                                 cur_gid++;
 310                                 break;
 311                         }
 312                 }
 313         }
 314
 315         /* we have checked the groups */
 316         /* we must now check the gid of the user or the primary group rid, that's the same */
 317         for (i=0; i<cur_gid && grid!=gids[i].g_rid; i++)
 318                 ;
 319
 320         /* the user's gid is already there */
 321         if (i!=cur_gid) {
 322                 /*
 323                  * the primary group of the user but be the first one in the list
 324                  * don't ask ! JFM.
 325                  */
 326                 gids[i].g_rid=gids[0].g_rid;
 327                 gids[0].g_rid=grid;
 328                 goto done;
 329         }
 330
 331         for(i=0; i<num_entries; i++) {
 332                 sid_peek_rid(&map[i].sid, &tmp_rid);
 333                 if (tmp_rid==grid) {
 334                         /*
 335                          * the primary group of the user but be the first one in the list
 336                          * don't ask ! JFM.
 337                          */
 338                         gids[cur_gid].g_rid=gids[0].g_rid;
 339                         gids[0].g_rid=tmp_rid;
 340                         gids[cur_gid].attr=7;
 341                         DEBUG(10,("get_domain_user_groups: primary gid of user found in group %s\n", map[i].nt_name));
 342                         cur_gid++;
 343                         goto done; /* leave the loop early */
 344                 }
 345         }
 346
 347         DEBUG(0,("get_domain_user_groups: primary gid of user [%s] is not a Domain group !\n", user_name));
 348         DEBUGADD(0,("get_domain_user_groups: You should fix it, NT doesn't like that\n"));
 349
 350
 351  done:
 352         *pgids=gids;
 353         *numgroups=cur_gid;
 354         safe_free(map);
 355
 356         return True;
 357 }
 358
 359 /*******************************************************************
 360  gets a domain user's groups from their already-calculated NT_USER_TOKEN
 361  ********************************************************************/
 362 NTSTATUS nt_token_to_group_list(TALLOC_CTX *mem_ctx, const DOM_SID *domain_sid,
 363                                 const NT_USER_TOKEN *nt_token,
 364                                 int *numgroups, DOM_GID **pgids)
 365 {
 366         DOM_GID *gids;
 367         int i;
 368
 369         gids = (DOM_GID *)talloc(mem_ctx, sizeof(*gids) * nt_token->num_sids);
 370
 371         if (!gids) {
 372                 return NT_STATUS_NO_MEMORY;
 373         }
 374
 375         *numgroups=0;
 376
 377         for (i=PRIMARY_GROUP_SID_INDEX; i < nt_token->num_sids; i++) {
 378                 if (sid_compare_domain(domain_sid, &nt_token->user_sids[i])==0) {
 379                         sid_peek_rid(&nt_token->user_sids[i], &(gids[*numgroups].g_rid));
 380                         gids[*numgroups].attr=7;
 381                         (*numgroups)++;
 382                 }
 383         }
 384         *pgids = gids;
 385         return NT_STATUS_OK;
 386 }
 387
 388 /*******************************************************************
 389  Look up a local (domain) rid and return a name and type.
 390  ********************************************************************/
 391 NTSTATUS local_lookup_group_name(uint32 rid, char *group_name, uint32 *type)
 392 {
 393         int i = 0;
 394         (*type) = SID_NAME_DOM_GRP;
 395
 396         DEBUG(5,("lookup_group_name: rid: %d", rid));
 397
 398         while (domain_group_rids[i].rid != rid && domain_group_rids[i].rid != 0)
 399         {
 400                 i++;
 401         }
 402
 403         if (domain_group_rids[i].rid != 0)
 404         {
 405                 fstrcpy(group_name, domain_group_rids[i].name);
 406                 DEBUG(5,(" = %s\n", group_name));
 407                 return NT_STATUS_OK;
 408         }
 409
 410         DEBUG(5,(" none mapped\n"));
 411         return NT_STATUS_NONE_MAPPED;
 412 }
 413
 414 /*******************************************************************
 415  Look up a local alias rid and return a name and type.
 416  ********************************************************************/
 417 NTSTATUS local_lookup_alias_name(uint32 rid, char *alias_name, uint32 *type)
 418 {
 419         int i = 0;
 420         (*type) = SID_NAME_WKN_GRP;
 421
 422         DEBUG(5,("lookup_alias_name: rid: %d", rid));
 423
 424         while (builtin_alias_rids[i].rid != rid && builtin_alias_rids[i].rid != 0)
 425         {
 426                 i++;
 427         }
 428
 429         if (builtin_alias_rids[i].rid != 0)
 430         {
 431                 fstrcpy(alias_name, builtin_alias_rids[i].name);
 432                 DEBUG(5,(" = %s\n", alias_name));
 433                 return NT_STATUS_OK;
 434         }
 435
 436         DEBUG(5,(" none mapped\n"));
 437         return NT_STATUS_NONE_MAPPED;
 438 }
 439
 440
 441 #if 0 /*Nobody uses this function just now*/
 442 /*******************************************************************
 443  Look up a local user rid and return a name and type.
 444  ********************************************************************/
 445 NTSTATUS local_lookup_user_name(uint32 rid, char *user_name, uint32 *type)
 446 {
 447         SAM_ACCOUNT *sampwd=NULL;
 448         int i = 0;
 449         BOOL ret;
 450
 451         (*type) = SID_NAME_USER;
 452
 453         DEBUG(5,("lookup_user_name: rid: %d", rid));
 454
 455         /* look up the well-known domain user rids first */
 456         while (domain_user_rids[i].rid != rid && domain_user_rids[i].rid != 0)
 457         {
 458                 i++;
 459         }
 460
 461         if (domain_user_rids[i].rid != 0) {
 462                 fstrcpy(user_name, domain_user_rids[i].name);
 463                 DEBUG(5,(" = %s\n", user_name));
 464                 return NT_STATUS_OK;
 465         }
 466
 467         pdb_init_sam(&sampwd);
 468
 469         /* ok, it's a user.  find the user account */
 470         become_root();
 471         ret = pdb_getsampwrid(sampwd, rid);
 472         unbecome_root();
 473
 474         if (ret == True) {
 475                 fstrcpy(user_name, pdb_get_username(sampwd) );
 476                 DEBUG(5,(" = %s\n", user_name));
 477                 pdb_free_sam(&sampwd);
 478                 return NT_STATUS_OK;
 479         }
 480
 481         DEBUG(5,(" none mapped\n"));
 482         pdb_free_sam(&sampwd);
 483         return NT_STATUS_NONE_MAPPED;
 484 }
 485
 486 #endif
 487
 488 /*******************************************************************
 489  Look up a local (domain) group name and return a rid
 490  ********************************************************************/
 491 NTSTATUS local_lookup_group_rid(char *group_name, uint32 *rid)
 492 {
 493         const char *grp_name;
 494         int i = -1; /* start do loop at -1 */
 495
 496         do /* find, if it exists, a group rid for the group name*/
 497         {
 498                 i++;
 499                 (*rid) = domain_group_rids[i].rid;
 500                 grp_name = domain_group_rids[i].name;
 501
 502         } while (grp_name != NULL && !strequal(grp_name, group_name));
 503
 504         return (grp_name != NULL) ? NT_STATUS_OK : NT_STATUS_NONE_MAPPED;
 505 }
 506
 507 /*******************************************************************
 508  Look up a local (BUILTIN) alias name and return a rid
 509  ********************************************************************/
 510 NTSTATUS local_lookup_alias_rid(const char *alias_name, uint32 *rid)
 511 {
 512         const char *als_name;
 513         int i = -1; /* start do loop at -1 */
 514
 515         do /* find, if it exists, a alias rid for the alias name*/
 516         {
 517                 i++;
 518                 (*rid) = builtin_alias_rids[i].rid;
 519                 als_name = builtin_alias_rids[i].name;
 520
 521         } while (als_name != NULL && !strequal(als_name, alias_name));
 522
 523         return (als_name != NULL) ? NT_STATUS_OK : NT_STATUS_NONE_MAPPED;
 524 }
 525
 526 /*******************************************************************
 527  Look up a local user name and return a rid
 528  ********************************************************************/
 529 NTSTATUS local_lookup_user_rid(char *user_name, uint32 *rid)
 530 {
 531         SAM_ACCOUNT *sampass=NULL;
 532         BOOL ret;
 533
 534         (*rid) = 0;
 535
 536         pdb_init_sam(&sampass);
 537
 538         /* find the user account */
 539         become_root();
 540         ret = pdb_getsampwnam(sampass, user_name);
 541         unbecome_root();
 542
 543         if (ret == True) {
 544                 (*rid) = pdb_get_user_rid(sampass);
 545                 pdb_free_sam(&sampass);
 546                 return NT_STATUS_OK;
 547         }
 548
 549         pdb_free_sam(&sampass);
 550         return NT_STATUS_NONE_MAPPED;
 551 }