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 #include "lib/util/base64.h"
  27
  28 bool tldap_entry_values(struct tldap_message *msg, const char *attribute,
  29                         DATA_BLOB **values, int *num_values)
  30 {
  31         struct tldap_attribute *attributes;
  32         int i, num_attributes;
  33
  34         if (!tldap_entry_attributes(msg, &attributes, &num_attributes)) {
  35                 return false;
  36         }
  37
  38         for (i=0; i<num_attributes; i++) {
  39                 if (strequal(attribute, attributes[i].name)) {
  40                         break;
  41                 }
  42         }
  43         if (i == num_attributes) {
  44                 return false;
  45         }
  46         *num_values = attributes[i].num_values;
  47         *values = attributes[i].values;
  48         return true;
  49 }
  50
  51 bool tldap_get_single_valueblob(struct tldap_message *msg,
  52                                 const char *attribute, DATA_BLOB *blob)
  53 {
  54         int num_values;
  55         DATA_BLOB *values;
  56
  57         if (attribute == NULL) {
  58                 return NULL;
  59         }
  60         if (!tldap_entry_values(msg, attribute, &values, &num_values)) {
  61                 return NULL;
  62         }
  63         if (num_values != 1) {
  64                 return NULL;
  65         }
  66         *blob = values[0];
  67         return true;
  68 }
  69
  70 char *tldap_talloc_single_attribute(struct tldap_message *msg,
  71                                     const char *attribute,
  72                                     TALLOC_CTX *mem_ctx)
  73 {
  74         DATA_BLOB val;
  75         char *result;
  76         size_t len;
  77
  78         if (!tldap_get_single_valueblob(msg, attribute, &val)) {
  79                 return NULL;
  80         }
  81         if (!convert_string_talloc(mem_ctx, CH_UTF8, CH_UNIX,
  82                                    val.data, val.length,
  83                                    &result, &len)) {
  84                 return NULL;
  85         }
  86         return result;
  87 }
  88
  89 bool tldap_pull_binsid(struct tldap_message *msg, const char *attribute,
  90                        struct dom_sid *sid)
  91 {
  92         DATA_BLOB val;
  93
  94         if (!tldap_get_single_valueblob(msg, attribute, &val)) {
  95                 return false;
  96         }
  97         return sid_parse(val.data, val.length, sid);
  98 }
  99
 100 bool tldap_pull_guid(struct tldap_message *msg, const char *attribute,
 101                      struct GUID *guid)
 102 {
 103         DATA_BLOB val;
 104
 105         if (!tldap_get_single_valueblob(msg, attribute, &val)) {
 106                 return false;
 107         }
 108         return NT_STATUS_IS_OK(GUID_from_data_blob(&val, guid));
 109 }
 110
 111 static bool tldap_add_blob_vals(TALLOC_CTX *mem_ctx, struct tldap_mod *mod,
 112                                 DATA_BLOB *newvals, int num_newvals)
 113 {
 114         int num_values = talloc_array_length(mod->values);
 115         int i;
 116         DATA_BLOB *tmp;
 117
 118         tmp = talloc_realloc(mem_ctx, mod->values, DATA_BLOB,
 119                              num_values + num_newvals);
 120         if (tmp == NULL) {
 121                 return false;
 122         }
 123         mod->values = tmp;
 124
 125         for (i=0; i<num_newvals; i++) {
 126                 mod->values[i+num_values].data = (uint8_t *)talloc_memdup(
 127                         mod->values, newvals[i].data, newvals[i].length);
 128                 if (mod->values[i+num_values].data == NULL) {
 129                         return false;
 130                 }
 131                 mod->values[i+num_values].length = newvals[i].length;
 132         }
 133         mod->num_values = num_values + num_newvals;
 134         return true;
 135 }
 136
 137 bool tldap_add_mod_blobs(TALLOC_CTX *mem_ctx,
 138                          struct tldap_mod **pmods, int *pnum_mods,
 139                          int mod_op, const char *attrib,
 140                          DATA_BLOB *newvals, int num_newvals)
 141 {
 142         struct tldap_mod new_mod;
 143         struct tldap_mod *mods = *pmods;
 144         struct tldap_mod *mod = NULL;
 145         int i, num_mods;
 146
 147         if (mods == NULL) {
 148                 mods = talloc_array(mem_ctx, struct tldap_mod, 0);
 149         }
 150         if (mods == NULL) {
 151                 return false;
 152         }
 153
 154         num_mods = *pnum_mods;
 155
 156         for (i=0; i<num_mods; i++) {
 157                 if ((mods[i].mod_op == mod_op)
 158                     && strequal(mods[i].attribute, attrib)) {
 159                         mod = &mods[i];
 160                         break;
 161                 }
 162         }
 163
 164         if (mod == NULL) {
 165                 new_mod.mod_op = mod_op;
 166                 new_mod.attribute = talloc_strdup(mods, attrib);
 167                 if (new_mod.attribute == NULL) {
 168                         return false;
 169                 }
 170                 new_mod.num_values = 0;
 171                 new_mod.values = NULL;
 172                 mod = &new_mod;
 173         }
 174
 175         if ((num_newvals != 0)
 176             && !tldap_add_blob_vals(mods, mod, newvals, num_newvals)) {
 177                 return false;
 178         }
 179
 180         if ((i == num_mods) && (talloc_array_length(mods) < num_mods + 1)) {
 181                 mods = talloc_realloc(talloc_tos(), mods, struct tldap_mod,
 182                                       num_mods+1);
 183                 if (mods == NULL) {
 184                         return false;
 185                 }
 186                 mods[num_mods] = *mod;
 187         }
 188
 189         *pmods = mods;
 190         *pnum_mods += 1;
 191         return true;
 192 }
 193
 194 bool tldap_add_mod_str(TALLOC_CTX *mem_ctx,
 195                        struct tldap_mod **pmods, int *pnum_mods,
 196                        int mod_op, const char *attrib, const char *str)
 197 {
 198         DATA_BLOB utf8;
 199         bool ret;
 200
 201         if (!convert_string_talloc(talloc_tos(), CH_UNIX, CH_UTF8, str,
 202                                    strlen(str), &utf8.data, &utf8.length)) {
 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)) {
 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)) {
 300                 /* can't do much here */
 301                 TALLOC_FREE(s1);
 302                 return 0;
 303         }
 304         ret = strcasecmp_m(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 = discard_const_p(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,
 338                          TLDAPRC rc)
 339 {
 340         const char *ld_error = NULL;
 341         char *res;
 342
 343         if (ld != NULL) {
 344                 ld_error = tldap_msg_diagnosticmessage(tldap_ctx_lastmsg(ld));
 345         }
 346         res = talloc_asprintf(mem_ctx, "LDAP error %d (%s), %s",
 347                               (int)TLDAP_RC_V(rc), tldap_rc2string(rc),
 348                               ld_error ? ld_error : "unknown");
 349         return res;
 350 }
 351
 352 TLDAPRC tldap_search_va(struct tldap_context *ld, const char *base, int scope,
 353                         const char *attrs[], int num_attrs, int attrsonly,
 354                         TALLOC_CTX *mem_ctx, struct tldap_message ***res,
 355                         const char *fmt, va_list ap)
 356 {
 357         char *filter;
 358         TLDAPRC rc;
 359
 360         filter = talloc_vasprintf(talloc_tos(), fmt, ap);
 361         if (filter == NULL) {
 362                 return TLDAP_NO_MEMORY;
 363         }
 364
 365         rc = tldap_search(ld, base, scope, filter,
 366                           attrs, num_attrs, attrsonly,
 367                           NULL /*sctrls*/, 0, NULL /*cctrls*/, 0,
 368                           0 /*timelimit*/, 0 /*sizelimit*/, 0 /*deref*/,
 369                           mem_ctx, res);
 370         TALLOC_FREE(filter);
 371         return rc;
 372 }
 373
 374 TLDAPRC tldap_search_fmt(struct tldap_context *ld, const char *base, int scope,
 375                          const char *attrs[], int num_attrs, int attrsonly,
 376                          TALLOC_CTX *mem_ctx, struct tldap_message ***res,
 377                          const char *fmt, ...)
 378 {
 379         va_list ap;
 380         TLDAPRC rc;
 381
 382         va_start(ap, fmt);
 383         rc = tldap_search_va(ld, base, scope, attrs, num_attrs, attrsonly,
 384                              mem_ctx, res, fmt, ap);
 385         va_end(ap);
 386         return rc;
 387 }
 388
 389 bool tldap_pull_uint64(struct tldap_message *msg, const char *attr,
 390                        uint64_t *presult)
 391 {
 392         char *str;
 393         uint64_t result;
 394
 395         str = tldap_talloc_single_attribute(msg, attr, talloc_tos());
 396         if (str == NULL) {
 397                 DEBUG(10, ("Could not find attribute %s\n", attr));
 398                 return false;
 399         }
 400         result = strtoull(str, NULL, 10);
 401         TALLOC_FREE(str);
 402         *presult = result;
 403         return true;
 404 }
 405
 406 bool tldap_pull_uint32(struct tldap_message *msg, const char *attr,
 407                        uint32_t *presult)
 408 {
 409         uint64_t result;
 410
 411         if (!tldap_pull_uint64(msg, attr, &result)) {
 412                 return false;
 413         }
 414         *presult = (uint32_t)result;
 415         return true;
 416 }
 417
 418 struct tldap_fetch_rootdse_state {
 419         struct tldap_context *ld;
 420         struct tldap_message *rootdse;
 421 };
 422
 423 static void tldap_fetch_rootdse_done(struct tevent_req *subreq);
 424
 425 struct tevent_req *tldap_fetch_rootdse_send(TALLOC_CTX *mem_ctx,
 426                                             struct tevent_context *ev,
 427                                             struct tldap_context *ld)
 428 {
 429         struct tevent_req *req, *subreq;
 430         struct tldap_fetch_rootdse_state *state;
 431         static const char *attrs[2] = { "*", "+" };
 432
 433         req = tevent_req_create(mem_ctx, &state,
 434                                 struct tldap_fetch_rootdse_state);
 435         if (req == NULL) {
 436                 return NULL;
 437         }
 438         state->ld = ld;
 439         state->rootdse = NULL;
 440
 441         subreq = tldap_search_send(
 442                 mem_ctx, ev, ld, "", TLDAP_SCOPE_BASE, "(objectclass=*)",
 443                 attrs, ARRAY_SIZE(attrs), 0, NULL, 0, NULL, 0, 0, 0, 0);
 444         if (tevent_req_nomem(subreq, req)) {
 445                 return tevent_req_post(req, ev);
 446         }
 447         tevent_req_set_callback(subreq, tldap_fetch_rootdse_done, req);
 448         return req;
 449 }
 450
 451 static void tldap_fetch_rootdse_done(struct tevent_req *subreq)
 452 {
 453         struct tevent_req *req = tevent_req_callback_data(
 454                 subreq, struct tevent_req);
 455         struct tldap_fetch_rootdse_state *state = tevent_req_data(
 456                 req, struct tldap_fetch_rootdse_state);
 457         struct tldap_message *msg;
 458         TLDAPRC rc;
 459
 460         rc = tldap_search_recv(subreq, state, &msg);
 461         if (tevent_req_ldap_error(req, rc)) {
 462                 TALLOC_FREE(subreq);
 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_ldap_error(req, TLDAP_PROTOCOL_ERROR);
 487         return;
 488 }
 489
 490 TLDAPRC 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         TLDAPRC rc;
 495         char *dn;
 496
 497         if (tevent_req_is_ldap_error(req, &rc)) {
 498                 return rc;
 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 TLDAP_SUCCESS;
 509 }
 510
 511 TLDAPRC 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         TLDAPRC rc = TLDAP_NO_MEMORY;
 517
 518         ev = samba_tevent_context_init(frame);
 519         if (ev == NULL) {
 520                 goto fail;
 521         }
 522         req = tldap_fetch_rootdse_send(frame, ev, ld);
 523         if (req == NULL) {
 524                 goto fail;
 525         }
 526         if (!tevent_req_poll(req, ev)) {
 527                 rc = TLDAP_OPERATIONS_ERROR;
 528                 goto fail;
 529         }
 530
 531         rc = tldap_fetch_rootdse_recv(req);
 532  fail:
 533         TALLOC_FREE(frame);
 534         return rc;
 535 }
 536
 537 struct tldap_message *tldap_rootdse(struct tldap_context *ld)
 538 {
 539         return talloc_get_type(tldap_context_getattr(ld, "tldap:rootdse"),
 540                                struct tldap_message);
 541 }
 542
 543 bool tldap_entry_has_attrvalue(struct tldap_message *msg,
 544                                const char *attribute,
 545                                const DATA_BLOB blob)
 546 {
 547         int i, num_values;
 548         DATA_BLOB *values;
 549
 550         if (!tldap_entry_values(msg, attribute, &values, &num_values)) {
 551                 return false;
 552         }
 553         for (i=0; i<num_values; i++) {
 554                 if (data_blob_cmp(&values[i], &blob) == 0) {
 555                         return true;
 556                 }
 557         }
 558         return false;
 559 }
 560
 561 bool tldap_supports_control(struct tldap_context *ld, const char *oid)
 562 {
 563         struct tldap_message *rootdse = tldap_rootdse(ld);
 564
 565         if (rootdse == NULL) {
 566                 return false;
 567         }
 568         return tldap_entry_has_attrvalue(rootdse, "supportedControl",
 569                                          data_blob_const(oid, strlen(oid)));
 570 }
 571
 572 struct tldap_control *tldap_add_control(TALLOC_CTX *mem_ctx,
 573                                         struct tldap_control *ctrls,
 574                                         int num_ctrls,
 575                                         struct tldap_control *ctrl)
 576 {
 577         struct tldap_control *result;
 578
 579         result = talloc_array(mem_ctx, struct tldap_control, num_ctrls+1);
 580         if (result == NULL) {
 581                 return NULL;
 582         }
 583         memcpy(result, ctrls, sizeof(struct tldap_control) * num_ctrls);
 584         result[num_ctrls] = *ctrl;
 585         return result;
 586 }
 587
 588 /*
 589  * Find a control returned by the server
 590  */
 591 struct tldap_control *tldap_msg_findcontrol(struct tldap_message *msg,
 592                                             const char *oid)
 593 {
 594         struct tldap_control *controls;
 595         int i, num_controls;
 596
 597         tldap_msg_sctrls(msg, &num_controls, &controls);
 598
 599         for (i=0; i<num_controls; i++) {
 600                 if (strcmp(controls[i].oid, oid) == 0) {
 601                         return &controls[i];
 602                 }
 603         }
 604         return NULL;
 605 }
 606
 607 struct tldap_search_paged_state {
 608         struct tevent_context *ev;
 609         struct tldap_context *ld;
 610         const char *base;
 611         const char *filter;
 612         int scope;
 613         const char **attrs;
 614         int num_attrs;
 615         int attrsonly;
 616         struct tldap_control *sctrls;
 617         int num_sctrls;
 618         struct tldap_control *cctrls;
 619         int num_cctrls;
 620         int timelimit;
 621         int sizelimit;
 622         int deref;
 623
 624         int page_size;
 625         struct asn1_data *asn1;
 626         DATA_BLOB cookie;
 627         struct tldap_message *result;
 628 };
 629
 630 static struct tevent_req *tldap_ship_paged_search(
 631         TALLOC_CTX *mem_ctx,
 632         struct tldap_search_paged_state *state)
 633 {
 634         struct tldap_control *pgctrl;
 635         struct asn1_data *asn1 = NULL;
 636
 637         asn1 = asn1_init(state);
 638         if (asn1 == NULL) {
 639                 return NULL;
 640         }
 641         if (!asn1_push_tag(asn1, ASN1_SEQUENCE(0))) goto err;
 642         if (!asn1_write_Integer(asn1, state->page_size)) goto err;
 643         if (!asn1_write_OctetString(asn1, state->cookie.data, state->cookie.length)) goto err;
 644         if (!asn1_pop_tag(asn1)) goto err;
 645         state->asn1 = asn1;
 646
 647         pgctrl = &state->sctrls[state->num_sctrls-1];
 648         pgctrl->oid = TLDAP_CONTROL_PAGEDRESULTS;
 649         pgctrl->critical = true;
 650         if (!asn1_blob(state->asn1, &pgctrl->value)) {
 651                 goto err;
 652         }
 653         return tldap_search_send(mem_ctx, state->ev, state->ld, state->base,
 654                                  state->scope, state->filter, state->attrs,
 655                                  state->num_attrs, state->attrsonly,
 656                                  state->sctrls, state->num_sctrls,
 657                                  state->cctrls, state->num_cctrls,
 658                                  state->timelimit, state->sizelimit,
 659                                  state->deref);
 660
 661   err:
 662
 663         TALLOC_FREE(asn1);
 664         return NULL;
 665 }
 666
 667 static void tldap_search_paged_done(struct tevent_req *subreq);
 668
 669 struct tevent_req *tldap_search_paged_send(TALLOC_CTX *mem_ctx,
 670                                            struct tevent_context *ev,
 671                                            struct tldap_context *ld,
 672                                            const char *base, int scope,
 673                                            const char *filter,
 674                                            const char **attrs,
 675                                            int num_attrs,
 676                                            int attrsonly,
 677                                            struct tldap_control *sctrls,
 678                                            int num_sctrls,
 679                                            struct tldap_control *cctrls,
 680                                            int num_cctrls,
 681                                            int timelimit,
 682                                            int sizelimit,
 683                                            int deref,
 684                                            int page_size)
 685 {
 686         struct tevent_req *req, *subreq;
 687         struct tldap_search_paged_state *state;
 688         struct tldap_control empty_control;
 689
 690         req = tevent_req_create(mem_ctx, &state,
 691                                 struct tldap_search_paged_state);
 692         if (req == NULL) {
 693                 return NULL;
 694         }
 695         state->ev = ev;
 696         state->ld = ld;
 697         state->base = base;
 698         state->filter = filter;
 699         state->scope = scope;
 700         state->attrs = attrs;
 701         state->num_attrs = num_attrs;
 702         state->attrsonly = attrsonly;
 703         state->cctrls = cctrls;
 704         state->num_cctrls = num_cctrls;
 705         state->timelimit = timelimit;
 706         state->sizelimit = sizelimit;
 707         state->deref = deref;
 708
 709         state->page_size = page_size;
 710         state->asn1 = NULL;
 711         state->cookie = data_blob_null;
 712
 713         ZERO_STRUCT(empty_control);
 714
 715         state->sctrls = tldap_add_control(state, sctrls, num_sctrls,
 716                                           &empty_control);
 717         if (tevent_req_nomem(state->sctrls, req)) {
 718                 return tevent_req_post(req, ev);
 719         }
 720         state->num_sctrls = num_sctrls+1;
 721
 722         subreq = tldap_ship_paged_search(state, state);
 723         if (tevent_req_nomem(subreq, req)) {
 724                 return tevent_req_post(req, ev);
 725         }
 726         tevent_req_set_callback(subreq, tldap_search_paged_done, req);
 727
 728         return req;
 729 }
 730
 731 static void tldap_search_paged_done(struct tevent_req *subreq)
 732 {
 733         struct tevent_req *req = tevent_req_callback_data(
 734                 subreq, struct tevent_req);
 735         struct tldap_search_paged_state *state = tevent_req_data(
 736                 req, struct tldap_search_paged_state);
 737         struct asn1_data *asn1 = NULL;
 738         struct tldap_control *pgctrl;
 739         TLDAPRC rc;
 740         int size;
 741
 742         rc = tldap_search_recv(subreq, state, &state->result);
 743         if (tevent_req_ldap_error(req, rc)) {
 744                 TALLOC_FREE(subreq);
 745                 return;
 746         }
 747
 748         TALLOC_FREE(state->asn1);
 749
 750         switch (tldap_msg_type(state->result)) {
 751         case TLDAP_RES_SEARCH_ENTRY:
 752         case TLDAP_RES_SEARCH_REFERENCE:
 753                 tevent_req_notify_callback(req);
 754                 return;
 755         case TLDAP_RES_SEARCH_RESULT:
 756                 break;
 757         default:
 758                 TALLOC_FREE(subreq);
 759                 tevent_req_ldap_error(req, TLDAP_PROTOCOL_ERROR);
 760                 return;
 761         }
 762
 763         TALLOC_FREE(subreq);
 764
 765         /* We've finished one paged search, fire the next */
 766
 767         pgctrl = tldap_msg_findcontrol(state->result,
 768                                        TLDAP_CONTROL_PAGEDRESULTS);
 769         if (pgctrl == NULL) {
 770                 /* RFC2696 requires the server to return the control */
 771                 tevent_req_ldap_error(req, TLDAP_PROTOCOL_ERROR);
 772                 return;
 773         }
 774
 775         TALLOC_FREE(state->cookie.data);
 776
 777         asn1 = asn1_init(talloc_tos());
 778         if (tevent_req_nomem(asn1, req)) {
 779                 return;
 780         }
 781
 782         asn1_load_nocopy(asn1, pgctrl->value.data, pgctrl->value.length);
 783         if (!asn1_start_tag(asn1, ASN1_SEQUENCE(0))) goto err;
 784         if (!asn1_read_Integer(asn1, &size)) goto err;
 785         if (!asn1_read_OctetString(asn1, state, &state->cookie)) goto err;
 786         if (!asn1_end_tag(asn1)) goto err;
 787
 788         TALLOC_FREE(asn1);
 789
 790         if (state->cookie.length == 0) {
 791                 /* We're done, no cookie anymore */
 792                 tevent_req_done(req);
 793                 return;
 794         }
 795
 796         TALLOC_FREE(state->result);
 797
 798         subreq = tldap_ship_paged_search(state, state);
 799         if (tevent_req_nomem(subreq, req)) {
 800                 return;
 801         }
 802         tevent_req_set_callback(subreq, tldap_search_paged_done, req);
 803
 804   err:
 805
 806         TALLOC_FREE(asn1);
 807         tevent_req_ldap_error(req, TLDAP_DECODING_ERROR);
 808 }
 809
 810 TLDAPRC tldap_search_paged_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 811                                 struct tldap_message **pmsg)
 812 {
 813         struct tldap_search_paged_state *state = tevent_req_data(
 814                 req, struct tldap_search_paged_state);
 815         TLDAPRC rc;
 816
 817         if (!tevent_req_is_in_progress(req)
 818             && tevent_req_is_ldap_error(req, &rc)) {
 819                 return rc;
 820         }
 821         if (tevent_req_is_in_progress(req)) {
 822                 switch (tldap_msg_type(state->result)) {
 823                 case TLDAP_RES_SEARCH_ENTRY:
 824                 case TLDAP_RES_SEARCH_REFERENCE:
 825                         break;
 826                 default:
 827                         return TLDAP_PROTOCOL_ERROR;
 828                 }
 829         }
 830         *pmsg = talloc_move(mem_ctx, &state->result);
 831         return TLDAP_SUCCESS;
 832 }