source/nsswitch/winbindd_sid.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon - sid related functions
   5
   6    Copyright (C) Tim Potter 2000
   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 #include "includes.h"
  24 #include "winbindd.h"
  25
  26 #undef DBGC_CLASS
  27 #define DBGC_CLASS DBGC_WINBIND
  28
  29 /* Convert a string  */
  30
  31 enum winbindd_result winbindd_lookupsid(struct winbindd_cli_state *state)
  32 {
  33         enum SID_NAME_USE type;
  34         DOM_SID sid;
  35         fstring name;
  36         fstring dom_name;
  37
  38         /* Ensure null termination */
  39         state->request.data.sid[sizeof(state->request.data.sid)-1]='\0';
  40
  41         DEBUG(3, ("[%5lu]: lookupsid %s\n", (unsigned long)state->pid,
  42                   state->request.data.sid));
  43
  44         /* Lookup sid from PDC using lsa_lookup_sids() */
  45
  46         if (!string_to_sid(&sid, state->request.data.sid)) {
  47                 DEBUG(5, ("%s not a SID\n", state->request.data.sid));
  48                 return WINBINDD_ERROR;
  49         }
  50
  51         /* Lookup the sid */
  52
  53         if (!winbindd_lookup_name_by_sid(&sid, dom_name, name, &type)) {
  54                 return WINBINDD_ERROR;
  55         }
  56
  57         fstrcpy(state->response.data.name.dom_name, dom_name);
  58         fstrcpy(state->response.data.name.name, name);
  59
  60         state->response.data.name.type = type;
  61
  62         return WINBINDD_OK;
  63 }
  64
  65
  66 /**
  67  * Look up the SID for a qualified name.
  68  **/
  69 enum winbindd_result winbindd_lookupname(struct winbindd_cli_state *state)
  70 {
  71         enum SID_NAME_USE type;
  72         fstring sid_str;
  73         char *name_domain, *name_user;
  74         DOM_SID sid;
  75         struct winbindd_domain *domain;
  76         char *p;
  77
  78         /* Ensure null termination */
  79         state->request.data.sid[sizeof(state->request.data.name.dom_name)-1]='\0';
  80
  81         /* Ensure null termination */
  82         state->request.data.sid[sizeof(state->request.data.name.name)-1]='\0';
  83
  84         /* cope with the name being a fully qualified name */
  85         p = strstr(state->request.data.name.name, lp_winbind_separator());
  86         if (p) {
  87                 *p = 0;
  88                 name_domain = state->request.data.name.name;
  89                 name_user = p+1;
  90         } else {
  91                 name_domain = state->request.data.name.dom_name;
  92                 name_user = state->request.data.name.name;
  93         }
  94
  95         DEBUG(3, ("[%5lu]: lookupname %s%s%s\n", (unsigned long)state->pid,
  96                   name_domain, lp_winbind_separator(), name_user));
  97
  98         if ((domain = find_lookup_domain_from_name(name_domain)) == NULL) {
  99                 DEBUG(0, ("could not find domain entry for domain %s\n",
 100                           name_domain));
 101                 return WINBINDD_ERROR;
 102         }
 103
 104         /* Lookup name from PDC using lsa_lookup_names() */
 105         if (!winbindd_lookup_sid_by_name(domain, name_domain, name_user, &sid, &type)) {
 106                 return WINBINDD_ERROR;
 107         }
 108
 109         sid_to_string(sid_str, &sid);
 110         fstrcpy(state->response.data.sid.sid, sid_str);
 111         state->response.data.sid.type = type;
 112
 113         return WINBINDD_OK;
 114 }
 115
 116 /* Convert a sid to a uid.  We assume we only have one rid attached to the
 117    sid. */
 118
 119 enum winbindd_result winbindd_sid_to_uid(struct winbindd_cli_state *state)
 120 {
 121         DOM_SID sid;
 122         NTSTATUS result;
 123
 124         /* Ensure null termination */
 125         state->request.data.sid[sizeof(state->request.data.sid)-1]='\0';
 126
 127         DEBUG(3, ("[%5lu]: sid to uid %s\n", (unsigned long)state->pid,
 128                   state->request.data.sid));
 129
 130         if (!string_to_sid(&sid, state->request.data.sid)) {
 131                 DEBUG(1, ("Could not get convert sid %s from string\n", state->request.data.sid));
 132                 return WINBINDD_ERROR;
 133         }
 134
 135         /* This gets a little tricky.  If we assume that usernames are syncd between
 136            /etc/passwd and the windows domain (such as a member of a Samba domain),
 137            the we need to get the uid from the OS and not alocate one ourselves */
 138
 139         if ( lp_winbind_trusted_domains_only() ) {
 140                 struct winbindd_domain *domain = NULL;
 141                 DOM_SID sid2;
 142                 uint32 rid;
 143
 144                 domain = find_our_domain();
 145                 if ( !domain ) {
 146                         DEBUG(0,("winbindd_sid_to_uid: can't find my own domain!\n"));
 147                         return WINBINDD_ERROR;
 148                 }
 149
 150                 sid_copy( &sid2, &sid );
 151                 sid_split_rid( &sid2, &rid );
 152
 153                 if ( sid_equal( &sid2, &domain->sid ) ) {
 154
 155                         fstring domain_name;
 156                         fstring user;
 157                         enum SID_NAME_USE type;
 158                         struct passwd *pw = NULL;
 159                         unid_t id;
 160
 161                         /* ok...here's we know that we are dealing with our
 162                            own domain (the one to which we are joined).  And
 163                            we know that there must be a UNIX account for this user.
 164                            So we lookup the sid and the call getpwnam().*/
 165
 166
 167                         /* But first check and see if we don't already have a mapping */
 168
 169                         if ( NT_STATUS_IS_OK(idmap_sid_to_uid(&sid, &(state->response.data.uid), ID_QUERY_ONLY)) )
 170                                 return WINBINDD_OK;
 171
 172                         /* now fall back to the hard way */
 173
 174                         if ( !winbindd_lookup_name_by_sid(&sid, domain_name, user, &type) )
 175                                 return WINBINDD_ERROR;
 176
 177                         if ( !(pw = getpwnam(user)) ) {
 178                                 DEBUG(0,("winbindd_sid_to_uid: 'winbind trusted domains only' is "
 179                                         "set but this user [%s] doesn't exist!\n", user));
 180                                 return WINBINDD_ERROR;
 181                         }
 182
 183                         state->response.data.uid = pw->pw_uid;
 184
 185                         id.uid = pw->pw_uid;
 186                         idmap_set_mapping( &sid, id, ID_USERID );
 187
 188                         return WINBINDD_OK;
 189                 }
 190
 191         }
 192
 193         /* Find uid for this sid and return it */
 194
 195         result = idmap_sid_to_uid(&sid, &(state->response.data.uid),
 196                                   ID_QUERY_ONLY);
 197
 198         if (NT_STATUS_IS_OK(result))
 199                 return WINBINDD_OK;
 200
 201         if (state->request.flags & WBFLAG_QUERY_ONLY)
 202                 return WINBINDD_ERROR;
 203
 204         /* The query-only did not work, allocate a new uid *if* it's a user */
 205
 206         {
 207                 fstring dom_name, name;
 208                 enum SID_NAME_USE type;
 209
 210                 if (!winbindd_lookup_name_by_sid(&sid, dom_name, name, &type))
 211                         return WINBINDD_ERROR;
 212
 213                 if ((type != SID_NAME_USER) && (type != SID_NAME_COMPUTER))
 214                         return WINBINDD_ERROR;
 215         }
 216
 217         result = idmap_sid_to_uid(&sid, &(state->response.data.uid), 0);
 218
 219         if (NT_STATUS_IS_OK(result))
 220                 return WINBINDD_OK;
 221
 222         DEBUG(1, ("Could not get uid for sid %s\n", state->request.data.sid));
 223         return WINBINDD_ERROR;
 224 }
 225
 226 /* Convert a sid to a gid.  We assume we only have one rid attached to the
 227    sid.*/
 228
 229 enum winbindd_result winbindd_sid_to_gid(struct winbindd_cli_state *state)
 230 {
 231         DOM_SID sid;
 232         NTSTATUS result;
 233
 234         /* Ensure null termination */
 235         state->request.data.sid[sizeof(state->request.data.sid)-1]='\0';
 236
 237         DEBUG(3, ("[%5lu]: sid to gid %s\n", (unsigned long)state->pid,
 238                   state->request.data.sid));
 239
 240         if (!string_to_sid(&sid, state->request.data.sid)) {
 241                 DEBUG(1, ("Could not cvt string to sid %s\n", state->request.data.sid));
 242                 return WINBINDD_ERROR;
 243         }
 244
 245         /* This gets a little tricky.  If we assume that usernames are syncd between
 246            /etc/passwd and the windows domain (such as a member of a Samba domain),
 247            the we need to get the uid from the OS and not alocate one ourselves */
 248
 249         if ( lp_winbind_trusted_domains_only() ) {
 250                 struct winbindd_domain *domain = NULL;
 251                 DOM_SID sid2;
 252                 uint32 rid;
 253                 unid_t id;
 254
 255                 domain = find_our_domain();
 256                 if ( !domain ) {
 257                         DEBUG(0,("winbindd_sid_to_uid: can't find my own domain!\n"));
 258                         return WINBINDD_ERROR;
 259                 }
 260
 261                 sid_copy( &sid2, &sid );
 262                 sid_split_rid( &sid2, &rid );
 263
 264                 if ( sid_equal( &sid2, &domain->sid ) ) {
 265
 266                         fstring domain_name;
 267                         fstring group;
 268                         enum SID_NAME_USE type;
 269                         struct group *grp = NULL;
 270
 271                         /* ok...here's we know that we are dealing with our
 272                            own domain (the one to which we are joined).  And
 273                            we know that there must be a UNIX account for this group.
 274                            So we lookup the sid and the call getpwnam().*/
 275
 276                         /* But first check and see if we don't already have a mapping */
 277
 278                         if ( NT_STATUS_IS_OK(idmap_sid_to_gid(&sid, &(state->response.data.gid), ID_QUERY_ONLY)) )
 279                                 return WINBINDD_OK;
 280
 281                         /* now fall back to the hard way */
 282
 283                         if ( !winbindd_lookup_name_by_sid(&sid, domain_name, group, &type) )
 284                                 return WINBINDD_ERROR;
 285
 286                         if ( !(grp = getgrnam(group)) ) {
 287                                 DEBUG(0,("winbindd_sid_to_uid: 'winbind trusted domains only' is "
 288                                         "set but this group [%s] doesn't exist!\n", group));
 289                                 return WINBINDD_ERROR;
 290                         }
 291
 292                         state->response.data.gid = grp->gr_gid;
 293
 294                         id.gid = grp->gr_gid;
 295                         idmap_set_mapping( &sid, id, ID_GROUPID );
 296
 297                         return WINBINDD_OK;
 298                 }
 299
 300         }
 301
 302         /* Find gid for this sid and return it */
 303
 304         result = idmap_sid_to_gid(&sid, &(state->response.data.gid),
 305                                   ID_QUERY_ONLY);
 306
 307         if (NT_STATUS_IS_OK(result))
 308                 return WINBINDD_OK;
 309
 310         if (state->request.flags & WBFLAG_QUERY_ONLY)
 311                 return WINBINDD_ERROR;
 312
 313         /* The query-only did not work, allocate a new gid *if* it's a group */
 314
 315         {
 316                 fstring dom_name, name;
 317                 enum SID_NAME_USE type;
 318
 319                 if (sid_check_is_in_our_domain(&sid)) {
 320                         /* This is for half-created aliases... */
 321                         type = SID_NAME_ALIAS;
 322                 } else {
 323                         /* Foreign domains need to be looked up by the DC if
 324                          * it's the right type */
 325                         if (!winbindd_lookup_name_by_sid(&sid, dom_name, name,
 326                                                          &type))
 327                                 return WINBINDD_ERROR;
 328                 }
 329
 330                 if ((type != SID_NAME_DOM_GRP) && (type != SID_NAME_ALIAS) &&
 331                     (type != SID_NAME_WKN_GRP))
 332                         return WINBINDD_ERROR;
 333         }
 334
 335         result = idmap_sid_to_gid(&sid, &(state->response.data.gid), 0);
 336
 337         if (NT_STATUS_IS_OK(result))
 338                 return WINBINDD_OK;
 339
 340         DEBUG(1, ("Could not get gid for sid %s\n", state->request.data.sid));
 341         return WINBINDD_ERROR;
 342 }
 343
 344 /* Convert a uid to a sid */
 345
 346 enum winbindd_result winbindd_uid_to_sid(struct winbindd_cli_state *state)
 347 {
 348         DOM_SID sid;
 349
 350         DEBUG(3, ("[%5lu]: uid to sid %lu\n", (unsigned long)state->pid,
 351                   (unsigned long)state->request.data.uid));
 352
 353         if ( (state->request.data.uid < server_state.uid_low )
 354                 || (state->request.data.uid > server_state.uid_high) )
 355         {
 356                 struct passwd *pw = NULL;
 357                 enum SID_NAME_USE type;
 358                 unid_t id;
 359                 struct winbindd_domain *domain;
 360
 361                 /* SPECIAL CASE FOR MEMBERS OF SAMBA DOMAINS */
 362
 363                 /* if we don't trust /etc/password then when can't know
 364                    anything about this uid */
 365
 366                 if ( !lp_winbind_trusted_domains_only() )
 367                         return WINBINDD_ERROR;
 368
 369
 370                 /* look for an idmap entry first */
 371
 372                 if ( NT_STATUS_IS_OK(idmap_uid_to_sid(&sid, state->request.data.uid)) )
 373                         goto done;
 374
 375                 /* if users exist in /etc/passwd, we should try to
 376                    use that uid. Get the username and the lookup the SID */
 377
 378                 if ( !(pw = getpwuid(state->request.data.uid)) )
 379                         return WINBINDD_ERROR;
 380
 381                 if ( !(domain = find_our_domain()) ) {
 382                         DEBUG(0,("winbindd_uid_to_sid: can't find my own domain!\n"));
 383                         return WINBINDD_ERROR;
 384                 }
 385
 386                 if ( !winbindd_lookup_sid_by_name(domain, domain->name, pw->pw_name, &sid, &type) )
 387                         return WINBINDD_ERROR;
 388
 389                 if ( type != SID_NAME_USER )
 390                         return WINBINDD_ERROR;
 391
 392                 /* don't fail if we can't store it */
 393
 394                 id.uid = pw->pw_uid;
 395                 idmap_set_mapping( &sid, id, ID_USERID );
 396
 397                 goto done;
 398         }
 399
 400         /* Lookup rid for this uid */
 401
 402         if (!NT_STATUS_IS_OK(idmap_uid_to_sid(&sid, state->request.data.uid))) {
 403                 DEBUG(1, ("Could not convert uid %lu to rid\n",
 404                           (unsigned long)state->request.data.uid));
 405                 return WINBINDD_ERROR;
 406         }
 407
 408 done:
 409         sid_to_string(state->response.data.sid.sid, &sid);
 410         state->response.data.sid.type = SID_NAME_USER;
 411
 412         return WINBINDD_OK;
 413 }
 414
 415 /* Convert a gid to a sid */
 416
 417 enum winbindd_result winbindd_gid_to_sid(struct winbindd_cli_state *state)
 418 {
 419         DOM_SID sid;
 420
 421         DEBUG(3, ("[%5lu]: gid to sid %lu\n", (unsigned long)state->pid,
 422                   (unsigned long)state->request.data.gid));
 423
 424         if ( (state->request.data.gid < server_state.gid_low)
 425                 || (state->request.data.gid > server_state.gid_high) )
 426         {
 427                 struct group *grp = NULL;
 428                 enum SID_NAME_USE type;
 429                 unid_t id;
 430                 struct winbindd_domain *domain;
 431
 432                 /* SPECIAL CASE FOR MEMBERS OF SAMBA DOMAINS */
 433
 434                 /* if we don't trust /etc/group then when can't know
 435                    anything about this gid */
 436
 437                 if ( !lp_winbind_trusted_domains_only() )
 438                         return WINBINDD_ERROR;
 439
 440                 /* look for an idmap entry first */
 441
 442                 if ( NT_STATUS_IS_OK(idmap_gid_to_sid(&sid, state->request.data.gid)) )
 443                         goto done;
 444
 445                 /* if users exist in /etc/group, we should try to
 446                    use that gid. Get the username and the lookup the SID */
 447
 448                 if ( !(grp = getgrgid(state->request.data.gid)) )
 449                         return WINBINDD_ERROR;
 450
 451                 if ( !(domain = find_our_domain()) ) {
 452                         DEBUG(0,("winbindd_uid_to_sid: can't find my own domain!\n"));
 453                         return WINBINDD_ERROR;
 454                 }
 455
 456                 if ( !winbindd_lookup_sid_by_name(domain, domain->name, grp->gr_name, &sid, &type) )
 457                         return WINBINDD_ERROR;
 458
 459                 if ( type!=SID_NAME_DOM_GRP && type!=SID_NAME_ALIAS )
 460                         return WINBINDD_ERROR;
 461
 462                 /* don't fail if we can't store it */
 463
 464                 id.gid = grp->gr_gid;
 465                 idmap_set_mapping( &sid, id, ID_GROUPID );
 466
 467                 goto done;
 468         }
 469
 470         /* Lookup sid for this uid */
 471
 472         if (!NT_STATUS_IS_OK(idmap_gid_to_sid(&sid, state->request.data.gid))) {
 473                 DEBUG(1, ("Could not convert gid %lu to sid\n",
 474                           (unsigned long)state->request.data.gid));
 475                 return WINBINDD_ERROR;
 476         }
 477
 478 done:
 479         /* Construct sid and return it */
 480         sid_to_string(state->response.data.sid.sid, &sid);
 481         state->response.data.sid.type = SID_NAME_DOM_GRP;
 482
 483         return WINBINDD_OK;
 484 }
 485
 486 enum winbindd_result winbindd_allocate_rid(struct winbindd_cli_state *state)
 487 {
 488         if ( !state->privileged ) {
 489                 DEBUG(2, ("winbindd_allocate_rid: non-privileged access "
 490                           "denied!\n"));
 491                 return WINBINDD_ERROR;
 492         }
 493
 494         /* We tell idmap to always allocate a user RID. There might be a good
 495          * reason to keep RID allocation for users to even and groups to
 496          * odd. This needs discussion I think. For now only allocate user
 497          * rids. */
 498
 499         if (!NT_STATUS_IS_OK(idmap_allocate_rid(&state->response.data.rid,
 500                                                 USER_RID_TYPE)))
 501                 return WINBINDD_ERROR;
 502
 503         return WINBINDD_OK;
 504 }