source/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                 idmap_cache_set_sid2uid(&sid, -1);
 170                 request_error(state);
 171                 return;
 172         }
 173
 174         idmap_cache_set_sid2uid(&sid, uid);
 175         state->response.data.uid = uid;
 176         request_ok(state);
 177 }
 178
 179 static void sid2uid_lookupsid_recv( void *private_data, bool success,
 180                                     const char *domain_name,
 181                                     const char *name,
 182                                     enum lsa_SidType type)
 183 {
 184         struct winbindd_cli_state *state =
 185                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 186         DOM_SID sid;
 187
 188         if (!string_to_sid(&sid, state->request.data.sid)) {
 189                 DEBUG(1, ("sid2uid_lookupsid_recv: Could not get convert sid "
 190                           "%s from string\n", state->request.data.sid));
 191                 request_error(state);
 192                 return;
 193         }
 194
 195         if (!success) {
 196                 DEBUG(5, ("sid2uid_lookupsid_recv Could not convert get sid type for %s\n",
 197                           state->request.data.sid));
 198                 goto fail;
 199         }
 200
 201         if ( (type!=SID_NAME_USER) && (type!=SID_NAME_COMPUTER) ) {
 202                 DEBUG(5,("sid2uid_lookupsid_recv: Sid %s is not a user or a computer.\n",
 203                          state->request.data.sid));
 204                 goto fail;
 205         }
 206
 207         /* always use the async interface (may block) */
 208         winbindd_sid2uid_async(state->mem_ctx, &sid, sid2uid_recv, state);
 209         return;
 210
 211  fail:
 212         idmap_cache_set_sid2uid(&sid, -1);
 213         request_error(state);
 214         return;
 215 }
 216
 217 void winbindd_sid_to_uid(struct winbindd_cli_state *state)
 218 {
 219         DOM_SID sid;
 220         uid_t uid;
 221         bool expired;
 222
 223         /* Ensure null termination */
 224         state->request.data.sid[sizeof(state->request.data.sid)-1]='\0';
 225
 226         DEBUG(3, ("[%5lu]: sid to uid %s\n", (unsigned long)state->pid,
 227                   state->request.data.sid));
 228
 229         if (!string_to_sid(&sid, state->request.data.sid)) {
 230                 DEBUG(1, ("Could not get convert sid %s from string\n",
 231                           state->request.data.sid));
 232                 request_error(state);
 233                 return;
 234         }
 235
 236         if (idmap_cache_find_sid2uid(&sid, &uid, &expired)) {
 237                 DEBUG(10, ("idmap_cache_find_sid2uid found %d%s\n",
 238                            (int)uid, expired ? " (expired)": ""));
 239                 if (expired && IS_DOMAIN_ONLINE(find_our_domain())) {
 240                         DEBUG(10, ("revalidating expired entry\n"));
 241                         goto backend;
 242                 }
 243                 if (uid == -1) {
 244                         DEBUG(10, ("Returning negative cache entry\n"));
 245                         request_error(state);
 246                         return;
 247                 }
 248                 DEBUG(10, ("Returning positive cache entry\n"));
 249                 state->response.data.uid = uid;
 250                 request_ok(state);
 251                 return;
 252         }
 253
 254         /* Validate the SID as a user.  Hopefully this will hit cache.
 255            Needed to prevent DoS by exhausting the uid allocation
 256            range from random SIDs. */
 257
 258  backend:
 259         winbindd_lookupsid_async( state->mem_ctx, &sid, sid2uid_lookupsid_recv, state );
 260 }
 261
 262 /* Convert a sid to a gid.  We assume we only have one rid attached to the
 263    sid.*/
 264
 265 static void sid2gid_recv(void *private_data, bool success, gid_t gid)
 266 {
 267         struct winbindd_cli_state *state =
 268                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 269         struct dom_sid sid;
 270
 271         string_to_sid(&sid, state->request.data.sid);
 272
 273         if (!success) {
 274                 DEBUG(5, ("Could not convert sid %s\n",
 275                           state->request.data.sid));
 276                 idmap_cache_set_sid2gid(&sid, -1);
 277                 request_error(state);
 278                 return;
 279         }
 280
 281         idmap_cache_set_sid2gid(&sid, gid);
 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         idmap_cache_set_sid2gid(&sid, -1);
 323         request_error(state);
 324         return;
 325 }
 326
 327 void winbindd_sid_to_gid(struct winbindd_cli_state *state)
 328 {
 329         DOM_SID sid;
 330         gid_t gid;
 331         bool expired;
 332
 333         /* Ensure null termination */
 334         state->request.data.sid[sizeof(state->request.data.sid)-1]='\0';
 335
 336         DEBUG(3, ("[%5lu]: sid to gid %s\n", (unsigned long)state->pid,
 337                   state->request.data.sid));
 338
 339         if (!string_to_sid(&sid, state->request.data.sid)) {
 340                 DEBUG(1, ("Could not get convert sid %s from string\n",
 341                           state->request.data.sid));
 342                 request_error(state);
 343                 return;
 344         }
 345
 346         if (idmap_cache_find_sid2gid(&sid, &gid, &expired)) {
 347                 DEBUG(10, ("idmap_cache_find_sid2gid found %d%s\n",
 348                            (int)gid, expired ? " (expired)": ""));
 349                 if (expired && IS_DOMAIN_ONLINE(find_our_domain())) {
 350                         DEBUG(10, ("revalidating expired entry\n"));
 351                         goto backend;
 352                 }
 353                 if (gid == -1) {
 354                         DEBUG(10, ("Returning negative cache entry\n"));
 355                         request_error(state);
 356                         return;
 357                 }
 358                 DEBUG(10, ("Returning positive cache entry\n"));
 359                 state->response.data.gid = gid;
 360                 request_ok(state);
 361                 return;
 362         }
 363
 364         /* Validate the SID as a group.  Hopefully this will hit cache.
 365            Needed to prevent DoS by exhausting the uid allocation
 366            range from random SIDs. */
 367
 368  backend:
 369         winbindd_lookupsid_async( state->mem_ctx, &sid, sid2gid_lookupsid_recv, state );
 370 }
 371
 372 static void sids2xids_recv(void *private_data, bool success, void *data, int len)
 373 {
 374         struct winbindd_cli_state *state =
 375                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 376
 377         if (!success) {
 378                 DEBUG(5, ("Could not convert sids to xids\n"));
 379                 request_error(state);
 380                 return;
 381         }
 382
 383         state->response.extra_data.data = data;
 384         state->response.length = sizeof(state->response) + len;
 385         request_ok(state);
 386 }
 387
 388 void winbindd_sids_to_unixids(struct winbindd_cli_state *state)
 389 {
 390         DEBUG(3, ("[%5lu]: sids to xids\n", (unsigned long)state->pid));
 391
 392         winbindd_sids2xids_async(state->mem_ctx,
 393                         state->request.extra_data.data,
 394                         state->request.extra_len,
 395                         sids2xids_recv, state);
 396 }
 397
 398 static void set_mapping_recv(void *private_data, bool success)
 399 {
 400         struct winbindd_cli_state *state =
 401                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 402
 403         if (!success) {
 404                 DEBUG(5, ("Could not set sid mapping\n"));
 405                 request_error(state);
 406                 return;
 407         }
 408
 409         request_ok(state);
 410 }
 411
 412 void winbindd_set_mapping(struct winbindd_cli_state *state)
 413 {
 414         struct id_map map;
 415         DOM_SID sid;
 416
 417         DEBUG(3, ("[%5lu]: set id map\n", (unsigned long)state->pid));
 418
 419         if ( ! state->privileged) {
 420                 DEBUG(0, ("Only root is allowed to set mappings!\n"));
 421                 request_error(state);
 422                 return;
 423         }
 424
 425         if (!string_to_sid(&sid, state->request.data.dual_idmapset.sid)) {
 426                 DEBUG(1, ("Could not get convert sid %s from string\n",
 427                           state->request.data.sid));
 428                 request_error(state);
 429                 return;
 430         }
 431
 432         map.sid = &sid;
 433         map.xid.id = state->request.data.dual_idmapset.id;
 434         map.xid.type = state->request.data.dual_idmapset.type;
 435
 436         winbindd_set_mapping_async(state->mem_ctx, &map,
 437                         set_mapping_recv, state);
 438 }
 439
 440 static void set_hwm_recv(void *private_data, bool success)
 441 {
 442         struct winbindd_cli_state *state =
 443                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 444
 445         if (!success) {
 446                 DEBUG(5, ("Could not set sid mapping\n"));
 447                 request_error(state);
 448                 return;
 449         }
 450
 451         request_ok(state);
 452 }
 453
 454 void winbindd_set_hwm(struct winbindd_cli_state *state)
 455 {
 456         struct unixid xid;
 457
 458         DEBUG(3, ("[%5lu]: set hwm\n", (unsigned long)state->pid));
 459
 460         if ( ! state->privileged) {
 461                 DEBUG(0, ("Only root is allowed to set mappings!\n"));
 462                 request_error(state);
 463                 return;
 464         }
 465
 466         xid.id = state->request.data.dual_idmapset.id;
 467         xid.type = state->request.data.dual_idmapset.type;
 468
 469         winbindd_set_hwm_async(state->mem_ctx, &xid, set_hwm_recv, state);
 470 }
 471
 472 /* Convert a uid to a sid */
 473
 474 static void uid2sid_recv(void *private_data, bool success, const char *sidstr)
 475 {
 476         struct winbindd_cli_state *state =
 477                 (struct winbindd_cli_state *)private_data;
 478         struct dom_sid sid;
 479
 480         if (!success || !string_to_sid(&sid, sidstr)) {
 481                 ZERO_STRUCT(sid);
 482                 idmap_cache_set_sid2uid(&sid, state->request.data.uid);
 483                 request_error(state);
 484                 return;
 485         }
 486
 487         DEBUG(10,("uid2sid: uid %lu has sid %s\n",
 488                   (unsigned long)(state->request.data.uid), sidstr));
 489
 490         idmap_cache_set_sid2uid(&sid, state->request.data.uid);
 491         fstrcpy(state->response.data.sid.sid, sidstr);
 492         state->response.data.sid.type = SID_NAME_USER;
 493         request_ok(state);
 494         return;
 495 }
 496
 497 void winbindd_uid_to_sid(struct winbindd_cli_state *state)
 498 {
 499         struct dom_sid sid;
 500         bool expired;
 501
 502         DEBUG(3, ("[%5lu]: uid to sid %lu\n", (unsigned long)state->pid,
 503                   (unsigned long)state->request.data.uid));
 504
 505         if (idmap_cache_find_uid2sid(state->request.data.uid, &sid,
 506                                      &expired)) {
 507                 DEBUG(10, ("idmap_cache_find_uid2sid found %d%s\n",
 508                            (int)state->request.data.uid,
 509                            expired ? " (expired)": ""));
 510                 if (expired && IS_DOMAIN_ONLINE(find_our_domain())) {
 511                         DEBUG(10, ("revalidating expired entry\n"));
 512                         goto backend;
 513                 }
 514                 if (is_null_sid(&sid)) {
 515                         DEBUG(10, ("Returning negative cache entry\n"));
 516                         request_error(state);
 517                         return;
 518                 }
 519                 DEBUG(10, ("Returning positive cache entry\n"));
 520                 sid_to_fstring(state->response.data.sid.sid, &sid);
 521                 request_ok(state);
 522                 return;
 523         }
 524
 525         /* always go via the async interface (may block) */
 526  backend:
 527         winbindd_uid2sid_async(state->mem_ctx, state->request.data.uid, uid2sid_recv, state);
 528 }
 529
 530 /* Convert a gid to a sid */
 531
 532 static void gid2sid_recv(void *private_data, bool success, const char *sidstr)
 533 {
 534         struct winbindd_cli_state *state =
 535                 (struct winbindd_cli_state *)private_data;
 536         struct dom_sid sid;
 537
 538         if (!success || !string_to_sid(&sid, sidstr)) {
 539                 ZERO_STRUCT(sid);
 540                 idmap_cache_set_sid2gid(&sid, state->request.data.gid);
 541                 request_error(state);
 542                 return;
 543         }
 544         DEBUG(10,("gid2sid: gid %lu has sid %s\n",
 545                   (unsigned long)(state->request.data.gid), sid));
 546
 547         idmap_cache_set_sid2gid(&sid, state->request.data.gid);
 548         fstrcpy(state->response.data.sid.sid, sidstr);
 549         state->response.data.sid.type = SID_NAME_DOM_GRP;
 550         request_ok(state);
 551         return;
 552 }
 553
 554
 555 void winbindd_gid_to_sid(struct winbindd_cli_state *state)
 556 {
 557         struct dom_sid sid;
 558         bool expired;
 559
 560         DEBUG(3, ("[%5lu]: gid to sid %lu\n", (unsigned long)state->pid,
 561                   (unsigned long)state->request.data.gid));
 562
 563         if (idmap_cache_find_gid2sid(state->request.data.gid, &sid,
 564                                      &expired)) {
 565                 DEBUG(10, ("idmap_cache_find_gid2sid found %d%s\n",
 566                            (int)state->request.data.gid,
 567                            expired ? " (expired)": ""));
 568                 if (expired && IS_DOMAIN_ONLINE(find_our_domain())) {
 569                         DEBUG(10, ("revalidating expired entry\n"));
 570                         goto backend;
 571                 }
 572                 if (is_null_sid(&sid)) {
 573                         DEBUG(10, ("Returning negative cache entry\n"));
 574                         request_error(state);
 575                         return;
 576                 }
 577                 DEBUG(10, ("Returning positive cache entry\n"));
 578                 sid_to_fstring(state->response.data.sid.sid, &sid);
 579                 request_ok(state);
 580                 return;
 581         }
 582
 583         /* always use async calls (may block) */
 584  backend:
 585         winbindd_gid2sid_async(state->mem_ctx, state->request.data.gid, gid2sid_recv, state);
 586 }
 587
 588 void winbindd_allocate_uid(struct winbindd_cli_state *state)
 589 {
 590         if ( !state->privileged ) {
 591                 DEBUG(2, ("winbindd_allocate_uid: non-privileged access "
 592                           "denied!\n"));
 593                 request_error(state);
 594                 return;
 595         }
 596
 597         sendto_child(state, idmap_child());
 598 }
 599
 600 enum winbindd_result winbindd_dual_allocate_uid(struct winbindd_domain *domain,
 601                                                 struct winbindd_cli_state *state)
 602 {
 603         struct unixid xid;
 604
 605         if (!NT_STATUS_IS_OK(idmap_allocate_uid(&xid))) {
 606                 return WINBINDD_ERROR;
 607         }
 608         state->response.data.uid = xid.id;
 609         return WINBINDD_OK;
 610 }
 611
 612 void winbindd_allocate_gid(struct winbindd_cli_state *state)
 613 {
 614         if ( !state->privileged ) {
 615                 DEBUG(2, ("winbindd_allocate_gid: non-privileged access "
 616                           "denied!\n"));
 617                 request_error(state);
 618                 return;
 619         }
 620
 621         sendto_child(state, idmap_child());
 622 }
 623
 624 enum winbindd_result winbindd_dual_allocate_gid(struct winbindd_domain *domain,
 625                                                 struct winbindd_cli_state *state)
 626 {
 627         struct unixid xid;
 628
 629         if (!NT_STATUS_IS_OK(idmap_allocate_gid(&xid))) {
 630                 return WINBINDD_ERROR;
 631         }
 632         state->response.data.gid = xid.id;
 633         return WINBINDD_OK;
 634 }