source3/lib/tldap_util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Infrastructure for async ldap client requests
   4    Copyright (C) Volker Lendecke 2009
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "tldap.h"
  22 #include "tldap_util.h"
  23 #include "../libcli/security/security.h"
  24 #include "../lib/util/asn1.h"
  25 #include "../librpc/ndr/libndr.h"
  26
  27 bool tldap_entry_values(struct tldap_message *msg, const char *attribute,
  28                         DATA_BLOB **values, int *num_values)
  29 {
  30         struct tldap_attribute *attributes;
  31         int i, num_attributes;
  32
  33         if (!tldap_entry_attributes(msg, &attributes, &num_attributes)) {
  34                 return false;
  35         }
  36
  37         for (i=0; i<num_attributes; i++) {
  38                 if (strequal(attribute, attributes[i].name)) {
  39                         break;
  40                 }
  41         }
  42         if (i == num_attributes) {
  43                 return false;
  44         }
  45         *num_values = attributes[i].num_values;
  46         *values = attributes[i].values;
  47         return true;
  48 }
  49
  50 bool tldap_get_single_valueblob(struct tldap_message *msg,
  51                                 const char *attribute, DATA_BLOB *blob)
  52 {
  53         int num_values;
  54         DATA_BLOB *values;
  55
  56         if (attribute == NULL) {
  57                 return NULL;
  58         }
  59         if (!tldap_entry_values(msg, attribute, &values, &num_values)) {
  60                 return NULL;
  61         }
  62         if (num_values != 1) {
  63                 return NULL;
  64         }
  65         *blob = values[0];
  66         return true;
  67 }
  68
  69 char *tldap_talloc_single_attribute(struct tldap_message *msg,
  70                                     const char *attribute,
  71                                     TALLOC_CTX *mem_ctx)
  72 {
  73         DATA_BLOB val;
  74         char *result;
  75         size_t len;
  76
  77         if (!tldap_get_single_valueblob(msg, attribute, &val)) {
  78                 return false;
  79         }
  80         if (!convert_string_talloc(mem_ctx, CH_UTF8, CH_UNIX,
  81                                    val.data, val.length,
  82                                    &result, &len, false)) {
  83                 return NULL;
  84         }
  85         return result;
  86 }
  87
  88 bool tldap_pull_binsid(struct tldap_message *msg, const char *attribute,
  89                        struct dom_sid *sid)
  90 {
  91         DATA_BLOB val;
  92
  93         if (!tldap_get_single_valueblob(msg, attribute, &val)) {
  94                 return false;
  95         }
  96         return sid_parse((char *)val.data, val.length, sid);
  97 }
  98
  99 bool tldap_pull_guid(struct tldap_message *msg, const char *attribute,
 100                      struct GUID *guid)
 101 {
 102         DATA_BLOB val;
 103
 104         if (!tldap_get_single_valueblob(msg, attribute, &val)) {
 105                 return false;
 106         }
 107         return NT_STATUS_IS_OK(GUID_from_data_blob(&val, guid));
 108 }
 109
 110 static bool tldap_add_blob_vals(TALLOC_CTX *mem_ctx, struct tldap_mod *mod,
 111                                 DATA_BLOB *newvals, int num_newvals)
 112 {
 113         int num_values = talloc_array_length(mod->values);
 114         int i;
 115         DATA_BLOB *tmp;
 116
 117         tmp = talloc_realloc(mem_ctx, mod->values, DATA_BLOB,
 118                              num_values + num_newvals);
 119         if (tmp == NULL) {
 120                 return false;
 121         }
 122         mod->values = tmp;
 123
 124         for (i=0; i<num_newvals; i++) {
 125                 mod->values[i+num_values].data = (uint8_t *)talloc_memdup(
 126                         mod->values, newvals[i].data, newvals[i].length);
 127                 if (mod->values[i+num_values].data == NULL) {
 128                         return false;
 129                 }
 130                 mod->values[i+num_values].length = newvals[i].length;
 131         }
 132         mod->num_values = num_values + num_newvals;
 133         return true;
 134 }
 135
 136 bool tldap_add_mod_blobs(TALLOC_CTX *mem_ctx,
 137                          struct tldap_mod **pmods, int *pnum_mods,
 138                          int mod_op, const char *attrib,
 139                          DATA_BLOB *newvals, int num_newvals)
 140 {
 141         struct tldap_mod new_mod;
 142         struct tldap_mod *mods = *pmods;
 143         struct tldap_mod *mod = NULL;
 144         int i, num_mods;
 145
 146         if (mods == NULL) {
 147                 mods = talloc_array(mem_ctx, struct tldap_mod, 0);
 148         }
 149         if (mods == NULL) {
 150                 return false;
 151         }
 152
 153         num_mods = *pnum_mods;
 154
 155         for (i=0; i<num_mods; i++) {
 156                 if ((mods[i].mod_op == mod_op)
 157                     && strequal(mods[i].attribute, attrib)) {
 158                         mod = &mods[i];
 159                         break;
 160                 }
 161         }
 162
 163         if (mod == NULL) {
 164                 new_mod.mod_op = mod_op;
 165                 new_mod.attribute = talloc_strdup(mods, attrib);
 166                 if (new_mod.attribute == NULL) {
 167                         return false;
 168                 }
 169                 new_mod.num_values = 0;
 170                 new_mod.values = NULL;
 171                 mod = &new_mod;
 172         }
 173
 174         if ((num_newvals != 0)
 175             && !tldap_add_blob_vals(mods, mod, newvals, num_newvals)) {
 176                 return false;
 177         }
 178
 179         if ((i == num_mods) && (talloc_array_length(mods) < num_mods + 1)) {
 180                 mods = talloc_realloc(talloc_tos(), mods, struct tldap_mod,
 181                                       num_mods+1);
 182                 if (mods == NULL) {
 183                         return false;
 184                 }
 185                 mods[num_mods] = *mod;
 186         }
 187
 188         *pmods = mods;
 189         *pnum_mods += 1;
 190         return true;
 191 }
 192
 193 bool tldap_add_mod_str(TALLOC_CTX *mem_ctx,
 194                        struct tldap_mod **pmods, int *pnum_mods,
 195                        int mod_op, const char *attrib, const char *str)
 196 {
 197         DATA_BLOB utf8;
 198         bool ret;
 199
 200         if (!convert_string_talloc(talloc_tos(), CH_UNIX, CH_UTF8, str,
 201                                    strlen(str), &utf8.data, &utf8.length,
 202                                    false)) {
 203                 return false;
 204         }
 205
 206         ret = tldap_add_mod_blobs(mem_ctx, pmods, pnum_mods, mod_op, attrib,
 207                                   &utf8, 1);
 208         TALLOC_FREE(utf8.data);
 209         return ret;
 210 }
 211
 212 static bool tldap_make_mod_blob_int(struct tldap_message *existing,
 213                                     TALLOC_CTX *mem_ctx,
 214                                     struct tldap_mod **pmods, int *pnum_mods,
 215                                     const char *attrib, DATA_BLOB newval,
 216                                     int (*comparison)(const DATA_BLOB *d1,
 217                                                       const DATA_BLOB *d2))
 218 {
 219         int num_values = 0;
 220         DATA_BLOB *values = NULL;
 221         DATA_BLOB oldval = data_blob_null;
 222
 223         if ((existing != NULL)
 224             && tldap_entry_values(existing, attrib, &values, &num_values)) {
 225
 226                 if (num_values > 1) {
 227                         /* can't change multivalue attributes atm */
 228                         return false;
 229                 }
 230                 if (num_values == 1) {
 231                         oldval = values[0];
 232                 }
 233         }
 234
 235         if ((oldval.data != NULL) && (newval.data != NULL)
 236             && (comparison(&oldval, &newval) == 0)) {
 237                 /* Believe it or not, but LDAP will deny a delete and
 238                    an add at the same time if the values are the
 239                    same... */
 240                 DEBUG(10,("tldap_make_mod_blob_int: attribute |%s| not "
 241                           "changed.\n", attrib));
 242                 return true;
 243         }
 244
 245         if (oldval.data != NULL) {
 246                 /* By deleting exactly the value we found in the entry this
 247                  * should be race-free in the sense that the LDAP-Server will
 248                  * deny the complete operation if somebody changed the
 249                  * attribute behind our back. */
 250                 /* This will also allow modifying single valued attributes in
 251                  * Novell NDS. In NDS you have to first remove attribute and
 252                  * then you could add new value */
 253
 254                 DEBUG(10, ("tldap_make_mod_blob_int: deleting attribute |%s|\n",
 255                            attrib));
 256                 if (!tldap_add_mod_blobs(mem_ctx, pmods, pnum_mods,
 257                                          TLDAP_MOD_DELETE,
 258                                          attrib, &oldval, 1)) {
 259                         return false;
 260                 }
 261         }
 262
 263         /* Regardless of the real operation (add or modify)
 264            we add the new value here. We rely on deleting
 265            the old value, should it exist. */
 266
 267         if (newval.data != NULL) {
 268                 DEBUG(10, ("tldap_make_mod_blob_int: adding attribute |%s| value len "
 269                            "%d\n", attrib, (int)newval.length));
 270                 if (!tldap_add_mod_blobs(mem_ctx, pmods, pnum_mods,
 271                                          TLDAP_MOD_ADD,
 272                                          attrib, &newval, 1)) {
 273                         return false;
 274                 }
 275         }
 276         return true;
 277 }
 278
 279 bool tldap_make_mod_blob(struct tldap_message *existing, TALLOC_CTX *mem_ctx,
 280                          struct tldap_mod **pmods, int *pnum_mods,
 281                          const char *attrib, DATA_BLOB newval)
 282 {
 283         return tldap_make_mod_blob_int(existing, mem_ctx, pmods, pnum_mods,
 284                                        attrib, newval, data_blob_cmp);
 285 }
 286
 287 static int compare_utf8_blobs(const DATA_BLOB *d1, const DATA_BLOB *d2)
 288 {
 289         char *s1, *s2;
 290         size_t s1len, s2len;
 291         int ret;
 292
 293         if (!convert_string_talloc(talloc_tos(), CH_UTF8, CH_UNIX, d1->data,
 294                                    d1->length, &s1, &s1len, false)) {
 295                 /* can't do much here */
 296                 return 0;
 297         }
 298         if (!convert_string_talloc(talloc_tos(), CH_UTF8, CH_UNIX, d2->data,
 299                                    d2->length, &s2, &s2len, false)) {
 300                 /* can't do much here */
 301                 TALLOC_FREE(s1);
 302                 return 0;
 303         }
 304         ret = StrCaseCmp(s1, s2);
 305         TALLOC_FREE(s2);
 306         TALLOC_FREE(s1);
 307         return ret;
 308 }
 309
 310 bool tldap_make_mod_fmt(struct tldap_message *existing, TALLOC_CTX *mem_ctx,
 311                         struct tldap_mod **pmods, int *pnum_mods,
 312                         const char *attrib, const char *fmt, ...)
 313 {
 314         va_list ap;
 315         char *newval;
 316         bool ret;
 317         DATA_BLOB blob = data_blob_null;
 318
 319         va_start(ap, fmt);
 320         newval = talloc_vasprintf(talloc_tos(), fmt, ap);
 321         va_end(ap);
 322
 323         if (newval == NULL) {
 324                 return false;
 325         }
 326
 327         blob.length = strlen(newval);
 328         if (blob.length != 0) {
 329                 blob.data = CONST_DISCARD(uint8_t *, newval);
 330         }
 331         ret = tldap_make_mod_blob_int(existing, mem_ctx, pmods, pnum_mods,
 332                                       attrib, blob, compare_utf8_blobs);
 333         TALLOC_FREE(newval);
 334         return ret;
 335 }
 336
 337 const char *tldap_errstr(TALLOC_CTX *mem_ctx, struct tldap_context *ld, int rc)
 338 {
 339         const char *ld_error = NULL;
 340         char *res;
 341
 342         if (ld != NULL) {
 343                 ld_error = tldap_msg_diagnosticmessage(tldap_ctx_lastmsg(ld));
 344         }
 345         res = talloc_asprintf(mem_ctx, "LDAP error %d (%s), %s", rc,
 346                               tldap_err2string(rc),
 347                               ld_error ? ld_error : "unknown");
 348         return res;
 349 }
 350
 351 int tldap_search_va(struct tldap_context *ld, const char *base, int scope,
 352                     const char *attrs[], int num_attrs, int attrsonly,
 353                     TALLOC_CTX *mem_ctx, struct tldap_message ***res,
 354                     const char *fmt, va_list ap)
 355 {
 356         char *filter;
 357         int ret;
 358
 359         filter = talloc_vasprintf(talloc_tos(), fmt, ap);
 360         if (filter == NULL) {
 361                 return TLDAP_NO_MEMORY;
 362         }
 363
 364         ret = tldap_search(ld, base, scope, filter,
 365                            attrs, num_attrs, attrsonly,
 366                            NULL /*sctrls*/, 0, NULL /*cctrls*/, 0,
 367                            0 /*timelimit*/, 0 /*sizelimit*/, 0 /*deref*/,
 368                            mem_ctx, res, NULL);
 369         TALLOC_FREE(filter);
 370         return ret;
 371 }
 372
 373 int tldap_search_fmt(struct tldap_context *ld, const char *base, int scope,
 374                      const char *attrs[], int num_attrs, int attrsonly,
 375                      TALLOC_CTX *mem_ctx, struct tldap_message ***res,
 376                      const char *fmt, ...)
 377 {
 378         va_list ap;
 379         int ret;
 380
 381         va_start(ap, fmt);
 382         ret = tldap_search_va(ld, base, scope, attrs, num_attrs, attrsonly,
 383                               mem_ctx, res, fmt, ap);
 384         va_end(ap);
 385         return ret;
 386 }
 387
 388 bool tldap_pull_uint64(struct tldap_message *msg, const char *attr,
 389                        uint64_t *presult)
 390 {
 391         char *str;
 392         uint64_t result;
 393
 394         str = tldap_talloc_single_attribute(msg, attr, talloc_tos());
 395         if (str == NULL) {
 396                 DEBUG(10, ("Could not find attribute %s\n", attr));
 397                 return false;
 398         }
 399         result = strtoull(str, NULL, 10);
 400         TALLOC_FREE(str);
 401         *presult = result;
 402         return true;
 403 }
 404
 405 bool tldap_pull_uint32(struct tldap_message *msg, const char *attr,
 406                        uint32_t *presult)
 407 {
 408         uint64_t result;
 409
 410         if (!tldap_pull_uint64(msg, attr, &result)) {
 411                 return false;
 412         }
 413         *presult = (uint32_t)result;
 414         return true;
 415 }
 416
 417 struct tldap_fetch_rootdse_state {
 418         struct tldap_context *ld;
 419         struct tldap_message *rootdse;
 420 };
 421
 422 static void tldap_fetch_rootdse_done(struct tevent_req *subreq);
 423
 424 struct tevent_req *tldap_fetch_rootdse_send(TALLOC_CTX *mem_ctx,
 425                                             struct tevent_context *ev,
 426                                             struct tldap_context *ld)
 427 {
 428         struct tevent_req *req, *subreq;
 429         struct tldap_fetch_rootdse_state *state;
 430         static const char *attrs[2] = { "*", "+" };
 431
 432         req = tevent_req_create(mem_ctx, &state,
 433                                 struct tldap_fetch_rootdse_state);
 434         if (req == NULL) {
 435                 return NULL;
 436         }
 437         state->ld = ld;
 438         state->rootdse = NULL;
 439
 440         subreq = tldap_search_send(
 441                 mem_ctx, ev, ld, "", TLDAP_SCOPE_BASE, "(objectclass=*)",
 442                 attrs, ARRAY_SIZE(attrs), 0, NULL, 0, NULL, 0, 0, 0, 0);
 443         if (tevent_req_nomem(subreq, req)) {
 444                 return tevent_req_post(req, ev);
 445         }
 446         tevent_req_set_callback(subreq, tldap_fetch_rootdse_done, req);
 447         return req;
 448 }
 449
 450 static void tldap_fetch_rootdse_done(struct tevent_req *subreq)
 451 {
 452         struct tevent_req *req = tevent_req_callback_data(
 453                 subreq, struct tevent_req);
 454         struct tldap_fetch_rootdse_state *state = tevent_req_data(
 455                 req, struct tldap_fetch_rootdse_state);
 456         struct tldap_message *msg;
 457         int rc;
 458
 459         rc = tldap_search_recv(subreq, state, &msg);
 460         if (rc != TLDAP_SUCCESS) {
 461                 TALLOC_FREE(subreq);
 462                 tevent_req_error(req, rc);
 463                 return;
 464         }
 465
 466         switch (tldap_msg_type(msg)) {
 467         case TLDAP_RES_SEARCH_ENTRY:
 468                 if (state->rootdse != NULL) {
 469                         goto protocol_error;
 470                 }
 471                 state->rootdse = msg;
 472                 break;
 473         case TLDAP_RES_SEARCH_RESULT:
 474                 TALLOC_FREE(subreq);
 475                 if (state->rootdse == NULL) {
 476                         goto protocol_error;
 477                 }
 478                 tevent_req_done(req);
 479                 break;
 480         default:
 481                 goto protocol_error;
 482         }
 483         return;
 484
 485 protocol_error:
 486         tevent_req_error(req, TLDAP_PROTOCOL_ERROR);
 487         return;
 488 }
 489
 490 int tldap_fetch_rootdse_recv(struct tevent_req *req)
 491 {
 492         struct tldap_fetch_rootdse_state *state = tevent_req_data(
 493                 req, struct tldap_fetch_rootdse_state);
 494         int err;
 495         char *dn;
 496
 497         if (tevent_req_is_ldap_error(req, &err)) {
 498                 return err;
 499         }
 500         /* Trigger parsing the dn, just to make sure it's ok */
 501         if (!tldap_entry_dn(state->rootdse, &dn)) {
 502                 return TLDAP_DECODING_ERROR;
 503         }
 504         if (!tldap_context_setattr(state->ld, "tldap:rootdse",
 505                                    &state->rootdse)) {
 506                 return TLDAP_NO_MEMORY;
 507         }
 508         return 0;
 509 }
 510
 511 int tldap_fetch_rootdse(struct tldap_context *ld)
 512 {
 513         TALLOC_CTX *frame = talloc_stackframe();
 514         struct tevent_context *ev;
 515         struct tevent_req *req;
 516         int result;
 517
 518         ev = event_context_init(frame);
 519         if (ev == NULL) {
 520                 result = TLDAP_NO_MEMORY;
 521                 goto fail;
 522         }
 523
 524         req = tldap_fetch_rootdse_send(frame, ev, ld);
 525         if (req == NULL) {
 526                 result = TLDAP_NO_MEMORY;
 527                 goto fail;
 528         }
 529
 530         if (!tevent_req_poll(req, ev)) {
 531                 result = TLDAP_OPERATIONS_ERROR;
 532                 goto fail;
 533         }
 534
 535         result = tldap_fetch_rootdse_recv(req);
 536  fail:
 537         TALLOC_FREE(frame);
 538         return result;
 539 }
 540
 541 struct tldap_message *tldap_rootdse(struct tldap_context *ld)
 542 {
 543         return talloc_get_type(tldap_context_getattr(ld, "tldap:rootdse"),
 544                                struct tldap_message);
 545 }
 546
 547 bool tldap_entry_has_attrvalue(struct tldap_message *msg,
 548                                const char *attribute,
 549                                const DATA_BLOB blob)
 550 {
 551         int i, num_values;
 552         DATA_BLOB *values;
 553
 554         if (!tldap_entry_values(msg, attribute, &values, &num_values)) {
 555                 return false;
 556         }
 557         for (i=0; i<num_values; i++) {
 558                 if (data_blob_cmp(&values[i], &blob) == 0) {
 559                         return true;
 560                 }
 561         }
 562         return false;
 563 }
 564
 565 bool tldap_supports_control(struct tldap_context *ld, const char *oid)
 566 {
 567         struct tldap_message *rootdse = tldap_rootdse(ld);
 568
 569         if (rootdse == NULL) {
 570                 return false;
 571         }
 572         return tldap_entry_has_attrvalue(rootdse, "supportedControl",
 573                                          data_blob_const(oid, strlen(oid)));
 574 }
 575
 576 struct tldap_control *tldap_add_control(TALLOC_CTX *mem_ctx,
 577                                         struct tldap_control *ctrls,
 578                                         int num_ctrls,
 579                                         struct tldap_control *ctrl)
 580 {
 581         struct tldap_control *result;
 582
 583         result = talloc_array(mem_ctx, struct tldap_control, num_ctrls+1);
 584         if (result == NULL) {
 585                 return NULL;
 586         }
 587         memcpy(result, ctrls, sizeof(struct tldap_control) * num_ctrls);
 588         result[num_ctrls] = *ctrl;
 589         return result;
 590 }
 591
 592 /*
 593  * Find a control returned by the server
 594  */
 595 struct tldap_control *tldap_msg_findcontrol(struct tldap_message *msg,
 596                                             const char *oid)
 597 {
 598         struct tldap_control *controls;
 599         int i, num_controls;
 600
 601         tldap_msg_sctrls(msg, &num_controls, &controls);
 602
 603         for (i=0; i<num_controls; i++) {
 604                 if (strcmp(controls[i].oid, oid) == 0) {
 605                         return &controls[i];
 606                 }
 607         }
 608         return NULL;
 609 }
 610
 611 struct tldap_search_paged_state {
 612         struct tevent_context *ev;
 613         struct tldap_context *ld;
 614         const char *base;
 615         const char *filter;
 616         int scope;
 617         const char **attrs;
 618         int num_attrs;
 619         int attrsonly;
 620         struct tldap_control *sctrls;
 621         int num_sctrls;
 622         struct tldap_control *cctrls;
 623         int num_cctrls;
 624         int timelimit;
 625         int sizelimit;
 626         int deref;
 627
 628         int page_size;
 629         struct asn1_data *asn1;
 630         DATA_BLOB cookie;
 631         struct tldap_message *result;
 632 };
 633
 634 static struct tevent_req *tldap_ship_paged_search(
 635         TALLOC_CTX *mem_ctx,
 636         struct tldap_search_paged_state *state)
 637 {
 638         struct tldap_control *pgctrl;
 639         struct asn1_data *asn1;
 640
 641         asn1 = asn1_init(state);
 642         if (asn1 == NULL) {
 643                 return NULL;
 644         }
 645         asn1_push_tag(asn1, ASN1_SEQUENCE(0));
 646         asn1_write_Integer(asn1, state->page_size);
 647         asn1_write_OctetString(asn1, state->cookie.data, state->cookie.length);
 648         asn1_pop_tag(asn1);
 649         if (asn1->has_error) {
 650                 TALLOC_FREE(asn1);
 651                 return NULL;
 652         }
 653         state->asn1 = asn1;
 654
 655         pgctrl = &state->sctrls[state->num_sctrls-1];
 656         pgctrl->oid = TLDAP_CONTROL_PAGEDRESULTS;
 657         pgctrl->critical = true;
 658         if (!asn1_blob(state->asn1, &pgctrl->value)) {
 659                 TALLOC_FREE(asn1);
 660                 return NULL;
 661         }
 662         return tldap_search_send(mem_ctx, state->ev, state->ld, state->base,
 663                                  state->scope, state->filter, state->attrs,
 664                                  state->num_attrs, state->attrsonly,
 665                                  state->sctrls, state->num_sctrls,
 666                                  state->cctrls, state->num_cctrls,
 667                                  state->timelimit, state->sizelimit,
 668                                  state->deref);
 669 }
 670
 671 static void tldap_search_paged_done(struct tevent_req *subreq);
 672
 673 struct tevent_req *tldap_search_paged_send(TALLOC_CTX *mem_ctx,
 674                                            struct tevent_context *ev,
 675                                            struct tldap_context *ld,
 676                                            const char *base, int scope,
 677                                            const char *filter,
 678                                            const char **attrs,
 679                                            int num_attrs,
 680                                            int attrsonly,
 681                                            struct tldap_control *sctrls,
 682                                            int num_sctrls,
 683                                            struct tldap_control *cctrls,
 684                                            int num_cctrls,
 685                                            int timelimit,
 686                                            int sizelimit,
 687                                            int deref,
 688                                            int page_size)
 689 {
 690         struct tevent_req *req, *subreq;
 691         struct tldap_search_paged_state *state;
 692         struct tldap_control empty_control;
 693
 694         req = tevent_req_create(mem_ctx, &state,
 695                                 struct tldap_search_paged_state);
 696         if (req == NULL) {
 697                 return NULL;
 698         }
 699         state->ev = ev;
 700         state->ld = ld;
 701         state->base = base;
 702         state->filter = filter;
 703         state->scope = scope;
 704         state->attrs = attrs;
 705         state->num_attrs = num_attrs;
 706         state->attrsonly = attrsonly;
 707         state->cctrls = cctrls;
 708         state->num_cctrls = num_cctrls;
 709         state->timelimit = timelimit;
 710         state->sizelimit = sizelimit;
 711         state->deref = deref;
 712
 713         state->page_size = page_size;
 714         state->asn1 = NULL;
 715         state->cookie = data_blob_null;
 716
 717         ZERO_STRUCT(empty_control);
 718
 719         state->sctrls = tldap_add_control(state, sctrls, num_sctrls,
 720                                           &empty_control);
 721         if (tevent_req_nomem(state->sctrls, req)) {
 722                 return tevent_req_post(req, ev);
 723         }
 724         state->num_sctrls = num_sctrls+1;
 725
 726         subreq = tldap_ship_paged_search(state, state);
 727         if (tevent_req_nomem(subreq, req)) {
 728                 return tevent_req_post(req, ev);
 729         }
 730         tevent_req_set_callback(subreq, tldap_search_paged_done, req);
 731
 732         return req;
 733 }
 734
 735 static void tldap_search_paged_done(struct tevent_req *subreq)
 736 {
 737         struct tevent_req *req = tevent_req_callback_data(
 738                 subreq, struct tevent_req);
 739         struct tldap_search_paged_state *state = tevent_req_data(
 740                 req, struct tldap_search_paged_state);
 741         struct asn1_data *asn1;
 742         struct tldap_control *pgctrl;
 743         int rc, size;
 744
 745         rc = tldap_search_recv(subreq, state, &state->result);
 746         if (rc != TLDAP_SUCCESS) {
 747                 TALLOC_FREE(subreq);
 748                 tevent_req_error(req, rc);
 749                 return;
 750         }
 751
 752         TALLOC_FREE(state->asn1);
 753
 754         switch (tldap_msg_type(state->result)) {
 755         case TLDAP_RES_SEARCH_ENTRY:
 756         case TLDAP_RES_SEARCH_REFERENCE:
 757                 tevent_req_notify_callback(req);
 758                 return;
 759         case TLDAP_RES_SEARCH_RESULT:
 760                 break;
 761         default:
 762                 TALLOC_FREE(subreq);
 763                 tevent_req_error(req, TLDAP_PROTOCOL_ERROR);
 764                 return;
 765         }
 766
 767         TALLOC_FREE(subreq);
 768
 769         /* We've finished one paged search, fire the next */
 770
 771         pgctrl = tldap_msg_findcontrol(state->result,
 772                                        TLDAP_CONTROL_PAGEDRESULTS);
 773         if (pgctrl == NULL) {
 774                 /* RFC2696 requires the server to return the control */
 775                 tevent_req_error(req, TLDAP_PROTOCOL_ERROR);
 776                 return;
 777         }
 778
 779         TALLOC_FREE(state->cookie.data);
 780
 781         asn1 = asn1_init(talloc_tos());
 782         if (asn1 == NULL) {
 783                 tevent_req_error(req, TLDAP_NO_MEMORY);
 784                 return;
 785         }
 786
 787         asn1_load_nocopy(asn1, pgctrl->value.data, pgctrl->value.length);
 788         asn1_start_tag(asn1, ASN1_SEQUENCE(0));
 789         asn1_read_Integer(asn1, &size);
 790         asn1_read_OctetString(asn1, state, &state->cookie);
 791         asn1_end_tag(asn1);
 792         if (asn1->has_error) {
 793                 tevent_req_error(req, TLDAP_DECODING_ERROR);
 794                 return;
 795         }
 796         TALLOC_FREE(asn1);
 797
 798         if (state->cookie.length == 0) {
 799                 /* We're done, no cookie anymore */
 800                 tevent_req_done(req);
 801                 return;
 802         }
 803
 804         TALLOC_FREE(state->result);
 805
 806         subreq = tldap_ship_paged_search(state, state);
 807         if (tevent_req_nomem(subreq, req)) {
 808                 return;
 809         }
 810         tevent_req_set_callback(subreq, tldap_search_paged_done, req);
 811 }
 812
 813 int tldap_search_paged_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 814                             struct tldap_message **pmsg)
 815 {
 816         struct tldap_search_paged_state *state = tevent_req_data(
 817                 req, struct tldap_search_paged_state);
 818         int err;
 819
 820         if (!tevent_req_is_in_progress(req)
 821             && tevent_req_is_ldap_error(req, &err)) {
 822                 return err;
 823         }
 824         if (tevent_req_is_in_progress(req)) {
 825                 switch (tldap_msg_type(state->result)) {
 826                 case TLDAP_RES_SEARCH_ENTRY:
 827                 case TLDAP_RES_SEARCH_REFERENCE:
 828                         break;
 829                 default:
 830                         return TLDAP_PROTOCOL_ERROR;
 831                 }
 832         }
 833         *pmsg = talloc_move(mem_ctx, &state->result);
 834         return TLDAP_SUCCESS;
 835 }