source3/winbindd/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 3 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, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "winbindd.h"
  24
  25 #undef DBGC_CLASS
  26 #define DBGC_CLASS DBGC_WINBIND
  27
  28 /* Convert a string  */
  29
  30 static void lookupsid_recv(void *private_data, bool success,
  31                            const char *dom_name, const char *name,
  32                            enum lsa_SidType type);
  33
  34 void winbindd_lookupsid(struct winbindd_cli_state *state)
  35 {
  36         DOM_SID sid;
  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         if (!string_to_sid(&sid, state->request.data.sid)) {
  45                 DEBUG(5, ("%s not a SID\n", state->request.data.sid));
  46                 request_error(state);
  47                 return;
  48         }
  49
  50         winbindd_lookupsid_async(state->mem_ctx, &sid, lookupsid_recv, state);
  51 }
  52
  53 static void lookupsid_recv(void *private_data, bool success,
  54                            const char *dom_name, const char *name,
  55                            enum lsa_SidType type)
  56 {
  57         struct winbindd_cli_state *state =
  58                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
  59
  60         if (!success) {
  61                 DEBUG(5, ("lookupsid returned an error\n"));
  62                 request_error(state);
  63                 return;
  64         }
  65
  66         fstrcpy(state->response.data.name.dom_name, dom_name);
  67         fstrcpy(state->response.data.name.name, name);
  68         state->response.data.name.type = type;
  69         request_ok(state);
  70 }
  71
  72 /**
  73  * Look up the SID for a qualified name.
  74  **/
  75
  76 static void lookupname_recv(void *private_data, bool success,
  77                             const DOM_SID *sid, enum lsa_SidType type);
  78
  79 void winbindd_lookupname(struct winbindd_cli_state *state)
  80 {
  81         char *name_domain, *name_user;
  82         char *p;
  83
  84         /* Ensure null termination */
  85         state->request.data.name.dom_name[sizeof(state->request.data.name.dom_name)-1]='\0';
  86
  87         /* Ensure null termination */
  88         state->request.data.name.name[sizeof(state->request.data.name.name)-1]='\0';
  89
  90         /* cope with the name being a fully qualified name */
  91         p = strstr(state->request.data.name.name, lp_winbind_separator());
  92         if (p) {
  93                 *p = 0;
  94                 name_domain = state->request.data.name.name;
  95                 name_user = p+1;
  96         } else {
  97                 name_domain = state->request.data.name.dom_name;
  98                 name_user = state->request.data.name.name;
  99         }
 100
 101         DEBUG(3, ("[%5lu]: lookupname %s%s%s\n", (unsigned long)state->pid,
 102                   name_domain, lp_winbind_separator(), name_user));
 103
 104         winbindd_lookupname_async(state->mem_ctx, name_domain, name_user,
 105                                   lookupname_recv, WINBINDD_LOOKUPNAME,
 106                                   state);
 107 }
 108
 109 static void lookupname_recv(void *private_data, bool success,
 110                             const DOM_SID *sid, enum lsa_SidType type)
 111 {
 112         struct winbindd_cli_state *state =
 113                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 114
 115         if (!success) {
 116                 DEBUG(5, ("lookupname returned an error\n"));
 117                 request_error(state);
 118                 return;
 119         }
 120
 121         sid_to_fstring(state->response.data.sid.sid, sid);
 122         state->response.data.sid.type = type;
 123         request_ok(state);
 124         return;
 125 }
 126
 127 void winbindd_lookuprids(struct winbindd_cli_state *state)
 128 {
 129         struct winbindd_domain *domain;
 130         DOM_SID domain_sid;
 131
 132         /* Ensure null termination */
 133         state->request.data.sid[sizeof(state->request.data.sid)-1]='\0';
 134
 135         DEBUG(10, ("lookup_rids: %s\n", state->request.data.sid));
 136
 137         if (!string_to_sid(&domain_sid, state->request.data.sid)) {
 138                 DEBUG(5, ("Could not convert %s to SID\n",
 139                           state->request.data.sid));
 140                 request_error(state);
 141                 return;
 142         }
 143
 144         domain = find_lookup_domain_from_sid(&domain_sid);
 145         if (domain == NULL) {
 146                 DEBUG(10, ("Could not find domain for name %s\n",
 147                            state->request.domain_name));
 148                 request_error(state);
 149                 return;
 150         }
 151
 152         sendto_domain(state, domain);
 153 }
 154
 155 /* Convert a sid to a uid.  We assume we only have one rid attached to the
 156    sid. */
 157
 158 static void sid2uid_recv(void *private_data, bool success, uid_t uid)
 159 {
 160         struct winbindd_cli_state *state =
 161                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 162         struct dom_sid sid;
 163
 164         string_to_sid(&sid, state->request.data.sid);
 165
 166         if (!success) {
 167                 DEBUG(5, ("Could not convert sid %s\n",
 168                           state->request.data.sid));
 169                 request_error(state);
 170                 return;
 171         }
 172
 173         state->response.data.uid = uid;
 174         request_ok(state);
 175 }
 176
 177 static void sid2uid_lookupsid_recv( void *private_data, bool success,
 178                                     const char *domain_name,
 179                                     const char *name,
 180                                     enum lsa_SidType type)
 181 {
 182         struct winbindd_cli_state *state =
 183                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 184         DOM_SID sid;
 185
 186         if (!string_to_sid(&sid, state->request.data.sid)) {
 187                 DEBUG(1, ("sid2uid_lookupsid_recv: Could not get convert sid "
 188                           "%s from string\n", state->request.data.sid));
 189                 request_error(state);
 190                 return;
 191         }
 192
 193         if (!success) {
 194                 DEBUG(5, ("sid2uid_lookupsid_recv Could not convert get sid type for %s\n",
 195                           state->request.data.sid));
 196                 goto fail;
 197         }
 198
 199         if ( (type!=SID_NAME_USER) && (type!=SID_NAME_COMPUTER) ) {
 200                 DEBUG(5,("sid2uid_lookupsid_recv: Sid %s is not a user or a computer.\n",
 201                          state->request.data.sid));
 202                 goto fail;
 203         }
 204
 205         /* always use the async interface (may block) */
 206         winbindd_sid2uid_async(state->mem_ctx, &sid, sid2uid_recv, state);
 207         return;
 208
 209  fail:
 210         /*
 211          * We have to set the cache ourselves here, the child which is
 212          * normally responsible was not queried yet.
 213          */
 214         idmap_cache_set_sid2uid(&sid, -1);
 215         request_error(state);
 216         return;
 217 }
 218
 219 void winbindd_sid_to_uid(struct winbindd_cli_state *state)
 220 {
 221         DOM_SID sid;
 222         uid_t uid;
 223         bool expired;
 224
 225         /* Ensure null termination */
 226         state->request.data.sid[sizeof(state->request.data.sid)-1]='\0';
 227
 228         DEBUG(3, ("[%5lu]: sid to uid %s\n", (unsigned long)state->pid,
 229                   state->request.data.sid));
 230
 231         if (!string_to_sid(&sid, state->request.data.sid)) {
 232                 DEBUG(1, ("Could not get convert sid %s from string\n",
 233                           state->request.data.sid));
 234                 request_error(state);
 235                 return;
 236         }
 237
 238         if (idmap_cache_find_sid2uid(&sid, &uid, &expired)) {
 239                 DEBUG(10, ("idmap_cache_find_sid2uid found %d%s\n",
 240                            (int)uid, expired ? " (expired)": ""));
 241                 if (expired && IS_DOMAIN_ONLINE(find_our_domain())) {
 242                         DEBUG(10, ("revalidating expired entry\n"));
 243                         goto backend;
 244                 }
 245                 if (uid == -1) {
 246                         DEBUG(10, ("Returning negative cache entry\n"));
 247                         request_error(state);
 248                         return;
 249                 }
 250                 DEBUG(10, ("Returning positive cache entry\n"));
 251                 state->response.data.uid = uid;
 252                 request_ok(state);
 253                 return;
 254         }
 255
 256         /* Validate the SID as a user.  Hopefully this will hit cache.
 257            Needed to prevent DoS by exhausting the uid allocation
 258            range from random SIDs. */
 259
 260  backend:
 261         winbindd_lookupsid_async( state->mem_ctx, &sid, sid2uid_lookupsid_recv, state );
 262 }
 263
 264 /* Convert a sid to a gid.  We assume we only have one rid attached to the
 265    sid.*/
 266
 267 static void sid2gid_recv(void *private_data, bool success, gid_t gid)
 268 {
 269         struct winbindd_cli_state *state =
 270                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 271         struct dom_sid sid;
 272
 273         string_to_sid(&sid, state->request.data.sid);
 274
 275         if (!success) {
 276                 DEBUG(5, ("Could not convert sid %s\n",
 277                           state->request.data.sid));
 278                 request_error(state);
 279                 return;
 280         }
 281
 282         state->response.data.gid = gid;
 283         request_ok(state);
 284 }
 285
 286 static void sid2gid_lookupsid_recv( void *private_data, bool success,
 287                                     const char *domain_name,
 288                                     const char *name,
 289                                     enum lsa_SidType type)
 290 {
 291         struct winbindd_cli_state *state =
 292                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 293         DOM_SID sid;
 294
 295         if (!string_to_sid(&sid, state->request.data.sid)) {
 296                 DEBUG(1, ("sid2gid_lookupsid_recv: Could not get convert sid "
 297                           "%s from string\n", state->request.data.sid));
 298                 request_error(state);
 299                 return;
 300         }
 301
 302         if (!success) {
 303                 DEBUG(5, ("sid2gid_lookupsid_recv: Could not get sid type for %s\n",
 304                           state->request.data.sid));
 305                 goto fail;
 306         }
 307
 308         if ( (type!=SID_NAME_DOM_GRP) &&
 309              (type!=SID_NAME_ALIAS) &&
 310              (type!=SID_NAME_WKN_GRP) )
 311         {
 312                 DEBUG(5,("sid2gid_lookupsid_recv: Sid %s is not a group.\n",
 313                          state->request.data.sid));
 314                 goto fail;
 315         }
 316
 317         /* always use the async interface (may block) */
 318         winbindd_sid2gid_async(state->mem_ctx, &sid, sid2gid_recv, state);
 319         return;
 320
 321  fail:
 322         /*
 323          * We have to set the cache ourselves here, the child which is
 324          * normally responsible was not queried yet.
 325          */
 326         idmap_cache_set_sid2gid(&sid, -1);
 327         request_error(state);
 328         return;
 329 }
 330
 331 void winbindd_sid_to_gid(struct winbindd_cli_state *state)
 332 {
 333         DOM_SID sid;
 334         gid_t gid;
 335         bool expired;
 336
 337         /* Ensure null termination */
 338         state->request.data.sid[sizeof(state->request.data.sid)-1]='\0';
 339
 340         DEBUG(3, ("[%5lu]: sid to gid %s\n", (unsigned long)state->pid,
 341                   state->request.data.sid));
 342
 343         if (!string_to_sid(&sid, state->request.data.sid)) {
 344                 DEBUG(1, ("Could not get convert sid %s from string\n",
 345                           state->request.data.sid));
 346                 request_error(state);
 347                 return;
 348         }
 349
 350         if (idmap_cache_find_sid2gid(&sid, &gid, &expired)) {
 351                 DEBUG(10, ("idmap_cache_find_sid2gid found %d%s\n",
 352                            (int)gid, expired ? " (expired)": ""));
 353                 if (expired && IS_DOMAIN_ONLINE(find_our_domain())) {
 354                         DEBUG(10, ("revalidating expired entry\n"));
 355                         goto backend;
 356                 }
 357                 if (gid == -1) {
 358                         DEBUG(10, ("Returning negative cache entry\n"));
 359                         request_error(state);
 360                         return;
 361                 }
 362                 DEBUG(10, ("Returning positive cache entry\n"));
 363                 state->response.data.gid = gid;
 364                 request_ok(state);
 365                 return;
 366         }
 367
 368         /* Validate the SID as a group.  Hopefully this will hit cache.
 369            Needed to prevent DoS by exhausting the uid allocation
 370            range from random SIDs. */
 371
 372  backend:
 373         winbindd_lookupsid_async( state->mem_ctx, &sid, sid2gid_lookupsid_recv, state );
 374 }
 375
 376 static void set_mapping_recv(void *private_data, bool success)
 377 {
 378         struct winbindd_cli_state *state =
 379                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 380
 381         if (!success) {
 382                 DEBUG(5, ("Could not set sid mapping\n"));
 383                 request_error(state);
 384                 return;
 385         }
 386
 387         request_ok(state);
 388 }
 389
 390 void winbindd_set_mapping(struct winbindd_cli_state *state)
 391 {
 392         struct id_map map;
 393         DOM_SID sid;
 394
 395         DEBUG(3, ("[%5lu]: set id map\n", (unsigned long)state->pid));
 396
 397         if ( ! state->privileged) {
 398                 DEBUG(0, ("Only root is allowed to set mappings!\n"));
 399                 request_error(state);
 400                 return;
 401         }
 402
 403         if (!string_to_sid(&sid, state->request.data.dual_idmapset.sid)) {
 404                 DEBUG(1, ("Could not get convert sid %s from string\n",
 405                           state->request.data.sid));
 406                 request_error(state);
 407                 return;
 408         }
 409
 410         map.sid = &sid;
 411         map.xid.id = state->request.data.dual_idmapset.id;
 412         map.xid.type = state->request.data.dual_idmapset.type;
 413
 414         winbindd_set_mapping_async(state->mem_ctx, &map,
 415                         set_mapping_recv, state);
 416 }
 417
 418 static void set_hwm_recv(void *private_data, bool success)
 419 {
 420         struct winbindd_cli_state *state =
 421                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 422
 423         if (!success) {
 424                 DEBUG(5, ("Could not set sid mapping\n"));
 425                 request_error(state);
 426                 return;
 427         }
 428
 429         request_ok(state);
 430 }
 431
 432 void winbindd_set_hwm(struct winbindd_cli_state *state)
 433 {
 434         struct unixid xid;
 435
 436         DEBUG(3, ("[%5lu]: set hwm\n", (unsigned long)state->pid));
 437
 438         if ( ! state->privileged) {
 439                 DEBUG(0, ("Only root is allowed to set mappings!\n"));
 440                 request_error(state);
 441                 return;
 442         }
 443
 444         xid.id = state->request.data.dual_idmapset.id;
 445         xid.type = state->request.data.dual_idmapset.type;
 446
 447         winbindd_set_hwm_async(state->mem_ctx, &xid, set_hwm_recv, state);
 448 }
 449
 450 /* Convert a uid to a sid */
 451
 452 static void uid2sid_recv(void *private_data, bool success, const char *sidstr)
 453 {
 454         struct winbindd_cli_state *state =
 455                 (struct winbindd_cli_state *)private_data;
 456         struct dom_sid sid;
 457
 458         if (!success || !string_to_sid(&sid, sidstr)) {
 459                 ZERO_STRUCT(sid);
 460                 idmap_cache_set_sid2uid(&sid, state->request.data.uid);
 461                 request_error(state);
 462                 return;
 463         }
 464
 465         DEBUG(10,("uid2sid: uid %lu has sid %s\n",
 466                   (unsigned long)(state->request.data.uid), sidstr));
 467
 468         idmap_cache_set_sid2uid(&sid, state->request.data.uid);
 469         fstrcpy(state->response.data.sid.sid, sidstr);
 470         state->response.data.sid.type = SID_NAME_USER;
 471         request_ok(state);
 472         return;
 473 }
 474
 475 void winbindd_uid_to_sid(struct winbindd_cli_state *state)
 476 {
 477         struct dom_sid sid;
 478         bool expired;
 479
 480         DEBUG(3, ("[%5lu]: uid to sid %lu\n", (unsigned long)state->pid,
 481                   (unsigned long)state->request.data.uid));
 482
 483         if (idmap_cache_find_uid2sid(state->request.data.uid, &sid,
 484                                      &expired)) {
 485                 DEBUG(10, ("idmap_cache_find_uid2sid found %d%s\n",
 486                            (int)state->request.data.uid,
 487                            expired ? " (expired)": ""));
 488                 if (expired && IS_DOMAIN_ONLINE(find_our_domain())) {
 489                         DEBUG(10, ("revalidating expired entry\n"));
 490                         goto backend;
 491                 }
 492                 if (is_null_sid(&sid)) {
 493                         DEBUG(10, ("Returning negative cache entry\n"));
 494                         request_error(state);
 495                         return;
 496                 }
 497                 DEBUG(10, ("Returning positive cache entry\n"));
 498                 sid_to_fstring(state->response.data.sid.sid, &sid);
 499                 request_ok(state);
 500                 return;
 501         }
 502
 503         /* always go via the async interface (may block) */
 504  backend:
 505         winbindd_uid2sid_async(state->mem_ctx, state->request.data.uid, uid2sid_recv, state);
 506 }
 507
 508 /* Convert a gid to a sid */
 509
 510 static void gid2sid_recv(void *private_data, bool success, const char *sidstr)
 511 {
 512         struct winbindd_cli_state *state =
 513                 (struct winbindd_cli_state *)private_data;
 514         struct dom_sid sid;
 515
 516         if (!success || !string_to_sid(&sid, sidstr)) {
 517                 ZERO_STRUCT(sid);
 518                 idmap_cache_set_sid2gid(&sid, state->request.data.gid);
 519                 request_error(state);
 520                 return;
 521         }
 522         DEBUG(10,("gid2sid: gid %lu has sid %s\n",
 523                   (unsigned long)(state->request.data.gid), sidstr));
 524
 525         idmap_cache_set_sid2gid(&sid, state->request.data.gid);
 526         fstrcpy(state->response.data.sid.sid, sidstr);
 527         state->response.data.sid.type = SID_NAME_DOM_GRP;
 528         request_ok(state);
 529         return;
 530 }
 531
 532
 533 void winbindd_gid_to_sid(struct winbindd_cli_state *state)
 534 {
 535         struct dom_sid sid;
 536         bool expired;
 537
 538         DEBUG(3, ("[%5lu]: gid to sid %lu\n", (unsigned long)state->pid,
 539                   (unsigned long)state->request.data.gid));
 540
 541         if (idmap_cache_find_gid2sid(state->request.data.gid, &sid,
 542                                      &expired)) {
 543                 DEBUG(10, ("idmap_cache_find_gid2sid found %d%s\n",
 544                            (int)state->request.data.gid,
 545                            expired ? " (expired)": ""));
 546                 if (expired && IS_DOMAIN_ONLINE(find_our_domain())) {
 547                         DEBUG(10, ("revalidating expired entry\n"));
 548                         goto backend;
 549                 }
 550                 if (is_null_sid(&sid)) {
 551                         DEBUG(10, ("Returning negative cache entry\n"));
 552                         request_error(state);
 553                         return;
 554                 }
 555                 DEBUG(10, ("Returning positive cache entry\n"));
 556                 sid_to_fstring(state->response.data.sid.sid, &sid);
 557                 request_ok(state);
 558                 return;
 559         }
 560
 561         /* always use async calls (may block) */
 562  backend:
 563         winbindd_gid2sid_async(state->mem_ctx, state->request.data.gid, gid2sid_recv, state);
 564 }
 565
 566 void winbindd_allocate_uid(struct winbindd_cli_state *state)
 567 {
 568         if ( !state->privileged ) {
 569                 DEBUG(2, ("winbindd_allocate_uid: non-privileged access "
 570                           "denied!\n"));
 571                 request_error(state);
 572                 return;
 573         }
 574
 575         sendto_child(state, idmap_child());
 576 }
 577
 578 enum winbindd_result winbindd_dual_allocate_uid(struct winbindd_domain *domain,
 579                                                 struct winbindd_cli_state *state)
 580 {
 581         struct unixid xid;
 582
 583         if (!NT_STATUS_IS_OK(idmap_allocate_uid(&xid))) {
 584                 return WINBINDD_ERROR;
 585         }
 586         state->response.data.uid = xid.id;
 587         return WINBINDD_OK;
 588 }
 589
 590 void winbindd_allocate_gid(struct winbindd_cli_state *state)
 591 {
 592         if ( !state->privileged ) {
 593                 DEBUG(2, ("winbindd_allocate_gid: non-privileged access "
 594                           "denied!\n"));
 595                 request_error(state);
 596                 return;
 597         }
 598
 599         sendto_child(state, idmap_child());
 600 }
 601
 602 enum winbindd_result winbindd_dual_allocate_gid(struct winbindd_domain *domain,
 603                                                 struct winbindd_cli_state *state)
 604 {
 605         struct unixid xid;
 606
 607         if (!NT_STATUS_IS_OK(idmap_allocate_gid(&xid))) {
 608                 return WINBINDD_ERROR;
 609         }
 610         state->response.data.gid = xid.id;
 611         return WINBINDD_OK;
 612 }