source3/lib/tldap.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 "replace.h"
  21 #include "tldap.h"
  22 #include "system/network.h"
  23 #include "system/locale.h"
  24 #include "lib/util/talloc_stack.h"
  25 #include "lib/util/samba_util.h"
  26 #include "lib/util_tsock.h"
  27 #include "../lib/util/asn1.h"
  28 #include "../lib/tsocket/tsocket.h"
  29 #include "../lib/util/tevent_unix.h"
  30
  31 static int tldap_simple_recv(struct tevent_req *req);
  32
  33 bool tevent_req_is_ldap_error(struct tevent_req *req, int *perr)
  34 {
  35         enum tevent_req_state state;
  36         uint64_t err;
  37
  38         if (!tevent_req_is_error(req, &state, &err)) {
  39                 return false;
  40         }
  41         switch (state) {
  42         case TEVENT_REQ_TIMED_OUT:
  43                 *perr = TLDAP_TIMEOUT;
  44                 break;
  45         case TEVENT_REQ_NO_MEMORY:
  46                 *perr = TLDAP_NO_MEMORY;
  47                 break;
  48         case TEVENT_REQ_USER_ERROR:
  49                 *perr = err;
  50                 break;
  51         default:
  52                 *perr = TLDAP_OPERATIONS_ERROR;
  53                 break;
  54         }
  55         return true;
  56 }
  57
  58 struct tldap_ctx_attribute {
  59         char *name;
  60         void *ptr;
  61 };
  62
  63 struct tldap_context {
  64         int ld_version;
  65         struct tstream_context *conn;
  66         bool server_down;
  67         int msgid;
  68         struct tevent_queue *outgoing;
  69         struct tevent_req **pending;
  70
  71         /* For the sync wrappers we need something like get_last_error... */
  72         struct tldap_message *last_msg;
  73
  74         /* debug */
  75         void (*log_fn)(void *context, enum tldap_debug_level level,
  76                        const char *fmt, va_list ap);
  77         void *log_private;
  78
  79         struct tldap_ctx_attribute *ctx_attrs;
  80 };
  81
  82 struct tldap_message {
  83         struct asn1_data *data;
  84         uint8_t *inbuf;
  85         int type;
  86         int id;
  87
  88         /* RESULT_ENTRY */
  89         char *dn;
  90         struct tldap_attribute *attribs;
  91
  92         /* Error data sent by the server */
  93         int lderr;
  94         char *res_matcheddn;
  95         char *res_diagnosticmessage;
  96         char *res_referral;
  97         struct tldap_control *res_sctrls;
  98
  99         /* Controls sent by the server */
 100         struct tldap_control *ctrls;
 101 };
 102
 103 void tldap_set_debug(struct tldap_context *ld,
 104                      void (*log_fn)(void *log_private,
 105                                     enum tldap_debug_level level,
 106                                     const char *fmt,
 107                                     va_list ap) PRINTF_ATTRIBUTE(3,0),
 108                      void *log_private)
 109 {
 110         ld->log_fn = log_fn;
 111         ld->log_private = log_private;
 112 }
 113
 114 static void tldap_debug(struct tldap_context *ld,
 115                          enum tldap_debug_level level,
 116                          const char *fmt, ...)
 117 {
 118         va_list ap;
 119         if (!ld) {
 120                 return;
 121         }
 122         if (ld->log_fn == NULL) {
 123                 return;
 124         }
 125         va_start(ap, fmt);
 126         ld->log_fn(ld->log_private, level, fmt, ap);
 127         va_end(ap);
 128 }
 129
 130 static int tldap_next_msgid(struct tldap_context *ld)
 131 {
 132         int result;
 133
 134         result = ld->msgid++;
 135         if (ld->msgid == 2147483647) {
 136                 ld->msgid = 1;
 137         }
 138         return result;
 139 }
 140
 141 struct tldap_context *tldap_context_create(TALLOC_CTX *mem_ctx, int fd)
 142 {
 143         struct tldap_context *ctx;
 144         int ret;
 145
 146         ctx = talloc_zero(mem_ctx, struct tldap_context);
 147         if (ctx == NULL) {
 148                 return NULL;
 149         }
 150         ret = tstream_bsd_existing_socket(ctx, fd, &ctx->conn);
 151         if (ret == -1) {
 152                 TALLOC_FREE(ctx);
 153                 return NULL;
 154         }
 155         ctx->msgid = 1;
 156         ctx->ld_version = 3;
 157         ctx->outgoing = tevent_queue_create(ctx, "tldap_outgoing");
 158         if (ctx->outgoing == NULL) {
 159                 TALLOC_FREE(ctx);
 160                 return NULL;
 161         }
 162         return ctx;
 163 }
 164
 165 bool tldap_connection_ok(struct tldap_context *ld)
 166 {
 167         if (ld == NULL) {
 168                 return false;
 169         }
 170         return !ld->server_down;
 171 }
 172
 173 static struct tldap_ctx_attribute *tldap_context_findattr(
 174         struct tldap_context *ld, const char *name)
 175 {
 176         size_t i, num_attrs;
 177
 178         num_attrs = talloc_array_length(ld->ctx_attrs);
 179
 180         for (i=0; i<num_attrs; i++) {
 181                 if (strcmp(ld->ctx_attrs[i].name, name) == 0) {
 182                         return &ld->ctx_attrs[i];
 183                 }
 184         }
 185         return NULL;
 186 }
 187
 188 bool tldap_context_setattr(struct tldap_context *ld,
 189                            const char *name, const void *_pptr)
 190 {
 191         struct tldap_ctx_attribute *tmp, *attr;
 192         char *tmpname;
 193         int num_attrs;
 194         void **pptr = (void **)discard_const_p(void,_pptr);
 195
 196         attr = tldap_context_findattr(ld, name);
 197         if (attr != NULL) {
 198                 /*
 199                  * We don't actually delete attrs, we don't expect tons of
 200                  * attributes being shuffled around.
 201                  */
 202                 TALLOC_FREE(attr->ptr);
 203                 if (*pptr != NULL) {
 204                         attr->ptr = talloc_move(ld->ctx_attrs, pptr);
 205                         *pptr = NULL;
 206                 }
 207                 return true;
 208         }
 209
 210         tmpname = talloc_strdup(ld, name);
 211         if (tmpname == NULL) {
 212                 return false;
 213         }
 214
 215         num_attrs = talloc_array_length(ld->ctx_attrs);
 216
 217         tmp = talloc_realloc(ld, ld->ctx_attrs, struct tldap_ctx_attribute,
 218                              num_attrs+1);
 219         if (tmp == NULL) {
 220                 TALLOC_FREE(tmpname);
 221                 return false;
 222         }
 223         tmp[num_attrs].name = talloc_move(tmp, &tmpname);
 224         if (*pptr != NULL) {
 225                 tmp[num_attrs].ptr = talloc_move(tmp, pptr);
 226         } else {
 227                 tmp[num_attrs].ptr = NULL;
 228         }
 229         *pptr = NULL;
 230         ld->ctx_attrs = tmp;
 231         return true;
 232 }
 233
 234 void *tldap_context_getattr(struct tldap_context *ld, const char *name)
 235 {
 236         struct tldap_ctx_attribute *attr = tldap_context_findattr(ld, name);
 237
 238         if (attr == NULL) {
 239                 return NULL;
 240         }
 241         return attr->ptr;
 242 }
 243
 244 struct read_ldap_state {
 245         uint8_t *buf;
 246         bool done;
 247 };
 248
 249 static ssize_t read_ldap_more(uint8_t *buf, size_t buflen, void *private_data);
 250 static void read_ldap_done(struct tevent_req *subreq);
 251
 252 static struct tevent_req *read_ldap_send(TALLOC_CTX *mem_ctx,
 253                                          struct tevent_context *ev,
 254                                          struct tstream_context *conn)
 255 {
 256         struct tevent_req *req, *subreq;
 257         struct read_ldap_state *state;
 258
 259         req = tevent_req_create(mem_ctx, &state, struct read_ldap_state);
 260         if (req == NULL) {
 261                 return NULL;
 262         }
 263         state->done = false;
 264
 265         subreq = tstream_read_packet_send(state, ev, conn, 2, read_ldap_more,
 266                                           state);
 267         if (tevent_req_nomem(subreq, req)) {
 268                 return tevent_req_post(req, ev);
 269         }
 270         tevent_req_set_callback(subreq, read_ldap_done, req);
 271         return req;
 272 }
 273
 274 static ssize_t read_ldap_more(uint8_t *buf, size_t buflen, void *private_data)
 275 {
 276         struct read_ldap_state *state = talloc_get_type_abort(
 277                 private_data, struct read_ldap_state);
 278         size_t len;
 279         int i, lensize;
 280
 281         if (state->done) {
 282                 /* We've been here, we're done */
 283                 return 0;
 284         }
 285
 286         /*
 287          * From ldap.h: LDAP_TAG_MESSAGE is 0x30
 288          */
 289         if (buf[0] != 0x30) {
 290                 return -1;
 291         }
 292
 293         len = buf[1];
 294         if ((len & 0x80) == 0) {
 295                 state->done = true;
 296                 return len;
 297         }
 298
 299         lensize = (len & 0x7f);
 300         len = 0;
 301
 302         if (buflen == 2) {
 303                 /* Please get us the full length */
 304                 return lensize;
 305         }
 306         if (buflen > 2 + lensize) {
 307                 state->done = true;
 308                 return 0;
 309         }
 310         if (buflen != 2 + lensize) {
 311                 return -1;
 312         }
 313
 314         for (i=0; i<lensize; i++) {
 315                 len = (len << 8) | buf[2+i];
 316         }
 317         return len;
 318 }
 319
 320 static void read_ldap_done(struct tevent_req *subreq)
 321 {
 322         struct tevent_req *req = tevent_req_callback_data(
 323                 subreq, struct tevent_req);
 324         struct read_ldap_state *state = tevent_req_data(
 325                 req, struct read_ldap_state);
 326         ssize_t nread;
 327         int err;
 328
 329         nread = tstream_read_packet_recv(subreq, state, &state->buf, &err);
 330         TALLOC_FREE(subreq);
 331         if (nread == -1) {
 332                 tevent_req_error(req, err);
 333                 return;
 334         }
 335         tevent_req_done(req);
 336 }
 337
 338 static ssize_t read_ldap_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 339                               uint8_t **pbuf, int *perrno)
 340 {
 341         struct read_ldap_state *state = tevent_req_data(
 342                 req, struct read_ldap_state);
 343
 344         if (tevent_req_is_unix_error(req, perrno)) {
 345                 return -1;
 346         }
 347         *pbuf = talloc_move(mem_ctx, &state->buf);
 348         return talloc_get_size(*pbuf);
 349 }
 350
 351 struct tldap_msg_state {
 352         struct tldap_context *ld;
 353         struct tevent_context *ev;
 354         int id;
 355         struct iovec iov;
 356
 357         struct asn1_data *data;
 358         uint8_t *inbuf;
 359 };
 360
 361 static bool tldap_push_controls(struct asn1_data *data,
 362                                 struct tldap_control *sctrls,
 363                                 int num_sctrls)
 364 {
 365         int i;
 366
 367         if ((sctrls == NULL) || (num_sctrls == 0)) {
 368                 return true;
 369         }
 370
 371         if (!asn1_push_tag(data, ASN1_CONTEXT(0))) return false;
 372
 373         for (i=0; i<num_sctrls; i++) {
 374                 struct tldap_control *c = &sctrls[i];
 375                 if (!asn1_push_tag(data, ASN1_SEQUENCE(0))) return false;
 376                 if (!asn1_write_OctetString(data, c->oid, strlen(c->oid))) return false;
 377                 if (c->critical) {
 378                         if (!asn1_write_BOOLEAN(data, true)) return false;
 379                 }
 380                 if (c->value.data != NULL) {
 381                         if (!asn1_write_OctetString(data, c->value.data,
 382                                                c->value.length)) return false;
 383                 }
 384                 if (!asn1_pop_tag(data)) return false; /* ASN1_SEQUENCE(0) */
 385         }
 386
 387         return asn1_pop_tag(data); /* ASN1_CONTEXT(0) */
 388 }
 389
 390 static void tldap_msg_sent(struct tevent_req *subreq);
 391 static void tldap_msg_received(struct tevent_req *subreq);
 392
 393 static struct tevent_req *tldap_msg_send(TALLOC_CTX *mem_ctx,
 394                                          struct tevent_context *ev,
 395                                          struct tldap_context *ld,
 396                                          int id, struct asn1_data *data,
 397                                          struct tldap_control *sctrls,
 398                                          int num_sctrls)
 399 {
 400         struct tevent_req *req, *subreq;
 401         struct tldap_msg_state *state;
 402         DATA_BLOB blob;
 403
 404         tldap_debug(ld, TLDAP_DEBUG_TRACE, "tldap_msg_send: sending msg %d\n",
 405                     id);
 406
 407         req = tevent_req_create(mem_ctx, &state, struct tldap_msg_state);
 408         if (req == NULL) {
 409                 return NULL;
 410         }
 411         state->ld = ld;
 412         state->ev = ev;
 413         state->id = id;
 414
 415         if (state->ld->server_down) {
 416                 tevent_req_error(req, TLDAP_SERVER_DOWN);
 417                 return tevent_req_post(req, ev);
 418         }
 419
 420         if (!tldap_push_controls(data, sctrls, num_sctrls)) {
 421                 tevent_req_error(req, TLDAP_ENCODING_ERROR);
 422                 return tevent_req_post(req, ev);
 423         }
 424
 425
 426         if (!asn1_pop_tag(data)) {
 427                 tevent_req_error(req, TLDAP_ENCODING_ERROR);
 428                 return tevent_req_post(req, ev);
 429         }
 430
 431         if (!asn1_blob(data, &blob)) {
 432                 tevent_req_error(req, TLDAP_ENCODING_ERROR);
 433                 return tevent_req_post(req, ev);
 434         }
 435
 436         state->iov.iov_base = (void *)blob.data;
 437         state->iov.iov_len = blob.length;
 438
 439         subreq = tstream_writev_queue_send(state, ev, ld->conn, ld->outgoing,
 440                                            &state->iov, 1);
 441         if (tevent_req_nomem(subreq, req)) {
 442                 return tevent_req_post(req, ev);
 443         }
 444         tevent_req_set_callback(subreq, tldap_msg_sent, req);
 445         return req;
 446 }
 447
 448 static void tldap_msg_unset_pending(struct tevent_req *req)
 449 {
 450         struct tldap_msg_state *state = tevent_req_data(
 451                 req, struct tldap_msg_state);
 452         struct tldap_context *ld = state->ld;
 453         int num_pending = talloc_array_length(ld->pending);
 454         int i;
 455
 456         tevent_req_set_cleanup_fn(req, NULL);
 457
 458         if (num_pending == 1) {
 459                 TALLOC_FREE(ld->pending);
 460                 return;
 461         }
 462
 463         for (i=0; i<num_pending; i++) {
 464                 if (req == ld->pending[i]) {
 465                         break;
 466                 }
 467         }
 468         if (i == num_pending) {
 469                 /*
 470                  * Something's seriously broken. Just returning here is the
 471                  * right thing nevertheless, the point of this routine is to
 472                  * remove ourselves from cli->pending.
 473                  */
 474                 return;
 475         }
 476
 477         /*
 478          * Remove ourselves from the cli->pending array
 479          */
 480         if (num_pending > 1) {
 481                 ld->pending[i] = ld->pending[num_pending-1];
 482         }
 483
 484         /*
 485          * No NULL check here, we're shrinking by sizeof(void *), and
 486          * talloc_realloc just adjusts the size for this.
 487          */
 488         ld->pending = talloc_realloc(NULL, ld->pending, struct tevent_req *,
 489                                      num_pending - 1);
 490 }
 491
 492 static void tldap_msg_cleanup(struct tevent_req *req,
 493                               enum tevent_req_state req_state)
 494 {
 495         switch (req_state) {
 496         case TEVENT_REQ_USER_ERROR:
 497         case TEVENT_REQ_RECEIVED:
 498                 tldap_msg_unset_pending(req);
 499                 return;
 500         default:
 501                 return;
 502         }
 503 }
 504
 505 static bool tldap_msg_set_pending(struct tevent_req *req)
 506 {
 507         struct tldap_msg_state *state = tevent_req_data(
 508                 req, struct tldap_msg_state);
 509         struct tldap_context *ld;
 510         struct tevent_req **pending;
 511         int num_pending;
 512         struct tevent_req *subreq;
 513
 514         ld = state->ld;
 515         num_pending = talloc_array_length(ld->pending);
 516
 517         pending = talloc_realloc(ld, ld->pending, struct tevent_req *,
 518                                  num_pending+1);
 519         if (pending == NULL) {
 520                 return false;
 521         }
 522         pending[num_pending] = req;
 523         ld->pending = pending;
 524         tevent_req_set_cleanup_fn(req, tldap_msg_cleanup);
 525
 526         if (num_pending > 0) {
 527                 return true;
 528         }
 529
 530         /*
 531          * We're the first one, add the read_ldap request that waits for the
 532          * answer from the server
 533          */
 534         subreq = read_ldap_send(ld->pending, state->ev, ld->conn);
 535         if (subreq == NULL) {
 536                 tldap_msg_unset_pending(req);
 537                 return false;
 538         }
 539         tevent_req_set_callback(subreq, tldap_msg_received, ld);
 540         return true;
 541 }
 542
 543 static void tldap_msg_sent(struct tevent_req *subreq)
 544 {
 545         struct tevent_req *req = tevent_req_callback_data(
 546                 subreq, struct tevent_req);
 547         struct tldap_msg_state *state = tevent_req_data(
 548                 req, struct tldap_msg_state);
 549         ssize_t nwritten;
 550         int err;
 551
 552         nwritten = tstream_writev_queue_recv(subreq, &err);
 553         TALLOC_FREE(subreq);
 554         if (nwritten == -1) {
 555                 state->ld->server_down = true;
 556                 tevent_req_error(req, TLDAP_SERVER_DOWN);
 557                 return;
 558         }
 559
 560         if (!tldap_msg_set_pending(req)) {
 561                 tevent_req_oom(req);
 562                 return;
 563         }
 564 }
 565
 566 static int tldap_msg_msgid(struct tevent_req *req)
 567 {
 568         struct tldap_msg_state *state = tevent_req_data(
 569                 req, struct tldap_msg_state);
 570
 571         return state->id;
 572 }
 573
 574 static void tldap_msg_received(struct tevent_req *subreq)
 575 {
 576         struct tldap_context *ld = tevent_req_callback_data(
 577                 subreq, struct tldap_context);
 578         struct tevent_req *req;
 579         struct tldap_msg_state *state;
 580         struct asn1_data *data;
 581         uint8_t *inbuf;
 582         ssize_t received;
 583         size_t num_pending;
 584         int i, err, status;
 585         int id;
 586         uint8_t type;
 587         bool ok;
 588
 589         received = read_ldap_recv(subreq, talloc_tos(), &inbuf, &err);
 590         TALLOC_FREE(subreq);
 591         if (received == -1) {
 592                 ld->server_down = true;
 593                 status = TLDAP_SERVER_DOWN;
 594                 goto fail;
 595         }
 596
 597         data = asn1_init(talloc_tos());
 598         if (data == NULL) {
 599                 status = TLDAP_NO_MEMORY;
 600                 goto fail;
 601         }
 602         asn1_load_nocopy(data, inbuf, received);
 603
 604         ok = true;
 605         ok &= asn1_start_tag(data, ASN1_SEQUENCE(0));
 606         ok &= asn1_read_Integer(data, &id);
 607         ok &= asn1_peek_uint8(data, &type);
 608
 609         if (!ok) {
 610                 status = TLDAP_PROTOCOL_ERROR;
 611                 goto fail;
 612         }
 613
 614         tldap_debug(ld, TLDAP_DEBUG_TRACE, "tldap_msg_received: got msg %d "
 615                     "type %d\n", id, (int)type);
 616
 617         num_pending = talloc_array_length(ld->pending);
 618
 619         for (i=0; i<num_pending; i++) {
 620                 if (id == tldap_msg_msgid(ld->pending[i])) {
 621                         break;
 622                 }
 623         }
 624         if (i == num_pending) {
 625                 /* Dump unexpected reply */
 626                 tldap_debug(ld, TLDAP_DEBUG_WARNING, "tldap_msg_received: "
 627                             "No request pending for msg %d\n", id);
 628                 TALLOC_FREE(data);
 629                 TALLOC_FREE(inbuf);
 630                 goto done;
 631         }
 632
 633         req = ld->pending[i];
 634         state = tevent_req_data(req, struct tldap_msg_state);
 635
 636         state->inbuf = talloc_move(state, &inbuf);
 637         state->data = talloc_move(state, &data);
 638
 639         tldap_msg_unset_pending(req);
 640         num_pending = talloc_array_length(ld->pending);
 641
 642         tevent_req_done(req);
 643
 644  done:
 645         if (num_pending == 0) {
 646                 return;
 647         }
 648         if (talloc_array_length(ld->pending) > num_pending) {
 649                 /*
 650                  * The callback functions called from tevent_req_done() above
 651                  * have put something on the pending queue. We don't have to
 652                  * trigger the read_ldap_send(), tldap_msg_set_pending() has
 653                  * done it for us already.
 654                  */
 655                 return;
 656         }
 657
 658         state = tevent_req_data(ld->pending[0], struct tldap_msg_state);
 659         subreq = read_ldap_send(ld->pending, state->ev, ld->conn);
 660         if (subreq == NULL) {
 661                 status = TLDAP_NO_MEMORY;
 662                 goto fail;
 663         }
 664         tevent_req_set_callback(subreq, tldap_msg_received, ld);
 665         return;
 666
 667  fail:
 668         while (talloc_array_length(ld->pending) > 0) {
 669                 req = ld->pending[0];
 670                 state = tevent_req_data(req, struct tldap_msg_state);
 671                 tevent_req_defer_callback(req, state->ev);
 672                 tevent_req_error(req, status);
 673         }
 674 }
 675
 676 static int tldap_msg_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 677                           struct tldap_message **pmsg)
 678 {
 679         struct tldap_msg_state *state = tevent_req_data(
 680                 req, struct tldap_msg_state);
 681         struct tldap_message *msg;
 682         int err;
 683         uint8_t msgtype;
 684
 685         if (tevent_req_is_ldap_error(req, &err)) {
 686                 return err;
 687         }
 688
 689         if (!asn1_peek_uint8(state->data, &msgtype)) {
 690                 return TLDAP_PROTOCOL_ERROR;
 691         }
 692
 693         if (pmsg == NULL) {
 694                 return TLDAP_SUCCESS;
 695         }
 696
 697         msg = talloc_zero(mem_ctx, struct tldap_message);
 698         if (msg == NULL) {
 699                 return TLDAP_NO_MEMORY;
 700         }
 701         msg->id = state->id;
 702
 703         msg->inbuf = talloc_move(msg, &state->inbuf);
 704         msg->data = talloc_move(msg, &state->data);
 705         msg->type = msgtype;
 706
 707         *pmsg = msg;
 708         return TLDAP_SUCCESS;
 709 }
 710
 711 struct tldap_req_state {
 712         int id;
 713         struct asn1_data *out;
 714         struct tldap_message *result;
 715 };
 716
 717 static struct tevent_req *tldap_req_create(TALLOC_CTX *mem_ctx,
 718                                            struct tldap_context *ld,
 719                                            struct tldap_req_state **pstate)
 720 {
 721         struct tevent_req *req;
 722         struct tldap_req_state *state;
 723
 724         req = tevent_req_create(mem_ctx, &state, struct tldap_req_state);
 725         if (req == NULL) {
 726                 return NULL;
 727         }
 728         state->out = asn1_init(state);
 729         if (state->out == NULL) {
 730                 goto err;
 731         }
 732         state->id = tldap_next_msgid(ld);
 733
 734         if (!asn1_push_tag(state->out, ASN1_SEQUENCE(0))) goto err;
 735         if (!asn1_write_Integer(state->out, state->id)) goto err;
 736
 737         *pstate = state;
 738         return req;
 739
 740   err:
 741
 742         TALLOC_FREE(req);
 743         return NULL;
 744 }
 745
 746 static void tldap_save_msg(struct tldap_context *ld, struct tevent_req *req)
 747 {
 748         struct tldap_req_state *state = tevent_req_data(
 749                 req, struct tldap_req_state);
 750
 751         TALLOC_FREE(ld->last_msg);
 752         ld->last_msg = talloc_move(ld, &state->result);
 753 }
 754
 755 static char *blob2string_talloc(TALLOC_CTX *mem_ctx, DATA_BLOB blob)
 756 {
 757         char *result = talloc_array(mem_ctx, char, blob.length+1);
 758
 759         if (result == NULL) {
 760                 return NULL;
 761         }
 762
 763         memcpy(result, blob.data, blob.length);
 764         result[blob.length] = '\0';
 765         return result;
 766 }
 767
 768 static bool asn1_read_OctetString_talloc(TALLOC_CTX *mem_ctx,
 769                                          struct asn1_data *data,
 770                                          char **presult)
 771 {
 772         DATA_BLOB string;
 773         char *result;
 774         if (!asn1_read_OctetString(data, mem_ctx, &string))
 775                 return false;
 776
 777         result = blob2string_talloc(mem_ctx, string);
 778
 779         data_blob_free(&string);
 780
 781         if (result == NULL) {
 782                 return false;
 783         }
 784         *presult = result;
 785         return true;
 786 }
 787
 788 static bool tldap_decode_controls(struct tldap_req_state *state);
 789
 790 static bool tldap_decode_response(struct tldap_req_state *state)
 791 {
 792         struct asn1_data *data = state->result->data;
 793         struct tldap_message *msg = state->result;
 794         bool ok = true;
 795
 796         ok &= asn1_read_enumerated(data, &msg->lderr);
 797         ok &= asn1_read_OctetString_talloc(msg, data, &msg->res_matcheddn);
 798         ok &= asn1_read_OctetString_talloc(msg, data,
 799                                            &msg->res_diagnosticmessage);
 800         if (!ok) return ok;
 801         if (asn1_peek_tag(data, ASN1_CONTEXT(3))) {
 802                 ok &= asn1_start_tag(data, ASN1_CONTEXT(3));
 803                 ok &= asn1_read_OctetString_talloc(msg, data,
 804                                                    &msg->res_referral);
 805                 ok &= asn1_end_tag(data);
 806         } else {
 807                 msg->res_referral = NULL;
 808         }
 809
 810         return ok;
 811 }
 812
 813 static void tldap_sasl_bind_done(struct tevent_req *subreq);
 814
 815 struct tevent_req *tldap_sasl_bind_send(TALLOC_CTX *mem_ctx,
 816                                         struct tevent_context *ev,
 817                                         struct tldap_context *ld,
 818                                         const char *dn,
 819                                         const char *mechanism,
 820                                         DATA_BLOB *creds,
 821                                         struct tldap_control *sctrls,
 822                                         int num_sctrls,
 823                                         struct tldap_control *cctrls,
 824                                         int num_cctrls)
 825 {
 826         struct tevent_req *req, *subreq;
 827         struct tldap_req_state *state;
 828
 829         req = tldap_req_create(mem_ctx, ld, &state);
 830         if (req == NULL) {
 831                 return NULL;
 832         }
 833
 834         if (dn == NULL) {
 835                 dn = "";
 836         }
 837
 838         if (!asn1_push_tag(state->out, TLDAP_REQ_BIND)) goto err;
 839         if (!asn1_write_Integer(state->out, ld->ld_version)) goto err;
 840         if (!asn1_write_OctetString(state->out, dn, strlen(dn))) goto err;
 841
 842         if (mechanism == NULL) {
 843                 if (!asn1_push_tag(state->out, ASN1_CONTEXT_SIMPLE(0))) goto err;
 844                 if (!asn1_write(state->out, creds->data, creds->length)) goto err;
 845                 if (!asn1_pop_tag(state->out)) goto err;
 846         } else {
 847                 if (!asn1_push_tag(state->out, ASN1_CONTEXT(3))) goto err;
 848                 if (!asn1_write_OctetString(state->out, mechanism,
 849                                        strlen(mechanism))) goto err;
 850                 if ((creds != NULL) && (creds->data != NULL)) {
 851                         if (!asn1_write_OctetString(state->out, creds->data,
 852                                                creds->length)) goto err;
 853                 }
 854                 if (!asn1_pop_tag(state->out)) goto err;
 855         }
 856
 857         if (!asn1_pop_tag(state->out)) goto err;
 858
 859         subreq = tldap_msg_send(state, ev, ld, state->id, state->out,
 860                                 sctrls, num_sctrls);
 861         if (tevent_req_nomem(subreq, req)) {
 862                 return tevent_req_post(req, ev);
 863         }
 864         tevent_req_set_callback(subreq, tldap_sasl_bind_done, req);
 865         return req;
 866
 867   err:
 868
 869         tevent_req_error(req, TLDAP_ENCODING_ERROR);
 870         return tevent_req_post(req, ev);
 871 }
 872
 873 static void tldap_sasl_bind_done(struct tevent_req *subreq)
 874 {
 875         struct tevent_req *req = tevent_req_callback_data(
 876                 subreq, struct tevent_req);
 877         struct tldap_req_state *state = tevent_req_data(
 878                 req, struct tldap_req_state);
 879         int err;
 880
 881         err = tldap_msg_recv(subreq, state, &state->result);
 882         TALLOC_FREE(subreq);
 883         if (err != TLDAP_SUCCESS) {
 884                 tevent_req_error(req, err);
 885                 return;
 886         }
 887         if (state->result->type != TLDAP_RES_BIND) {
 888                 tevent_req_error(req, TLDAP_PROTOCOL_ERROR);
 889                 return;
 890         }
 891         if (!asn1_start_tag(state->result->data, state->result->type) ||
 892             !tldap_decode_response(state) ||
 893             !asn1_end_tag(state->result->data)) {
 894                 tevent_req_error(req, TLDAP_DECODING_ERROR);
 895                 return;
 896         }
 897         /*
 898          * TODO: pull the reply blob
 899          */
 900         if (state->result->lderr != TLDAP_SUCCESS) {
 901                 tevent_req_error(req, state->result->lderr);
 902                 return;
 903         }
 904         tevent_req_done(req);
 905 }
 906
 907 int tldap_sasl_bind_recv(struct tevent_req *req)
 908 {
 909         return tldap_simple_recv(req);
 910 }
 911
 912 int tldap_sasl_bind(struct tldap_context *ld,
 913                     const char *dn,
 914                     const char *mechanism,
 915                     DATA_BLOB *creds,
 916                     struct tldap_control *sctrls,
 917                     int num_sctrls,
 918                     struct tldap_control *cctrls,
 919                     int num_cctrls)
 920 {
 921         TALLOC_CTX *frame = talloc_stackframe();
 922         struct tevent_context *ev;
 923         struct tevent_req *req;
 924         int result;
 925
 926         ev = samba_tevent_context_init(frame);
 927         if (ev == NULL) {
 928                 result = TLDAP_NO_MEMORY;
 929                 goto fail;
 930         }
 931
 932         req = tldap_sasl_bind_send(frame, ev, ld, dn, mechanism, creds,
 933                                    sctrls, num_sctrls, cctrls, num_cctrls);
 934         if (req == NULL) {
 935                 result = TLDAP_NO_MEMORY;
 936                 goto fail;
 937         }
 938
 939         if (!tevent_req_poll(req, ev)) {
 940                 result = TLDAP_OPERATIONS_ERROR;
 941                 goto fail;
 942         }
 943
 944         result = tldap_sasl_bind_recv(req);
 945         tldap_save_msg(ld, req);
 946  fail:
 947         TALLOC_FREE(frame);
 948         return result;
 949 }
 950
 951 struct tevent_req *tldap_simple_bind_send(TALLOC_CTX *mem_ctx,
 952                                           struct tevent_context *ev,
 953                                           struct tldap_context *ld,
 954                                           const char *dn,
 955                                           const char *passwd)
 956 {
 957         DATA_BLOB cred;
 958
 959         if (passwd != NULL) {
 960                 cred.data = discard_const_p(uint8_t, passwd);
 961                 cred.length = strlen(passwd);
 962         } else {
 963                 cred.data = discard_const_p(uint8_t, "");
 964                 cred.length = 0;
 965         }
 966         return tldap_sasl_bind_send(mem_ctx, ev, ld, dn, NULL, &cred, NULL, 0,
 967                                     NULL, 0);
 968 }
 969
 970 int tldap_simple_bind_recv(struct tevent_req *req)
 971 {
 972         return tldap_sasl_bind_recv(req);
 973 }
 974
 975 int tldap_simple_bind(struct tldap_context *ld, const char *dn,
 976                       const char *passwd)
 977 {
 978         DATA_BLOB cred;
 979
 980         if (passwd != NULL) {
 981                 cred.data = discard_const_p(uint8_t, passwd);
 982                 cred.length = strlen(passwd);
 983         } else {
 984                 cred.data = discard_const_p(uint8_t, "");
 985                 cred.length = 0;
 986         }
 987         return tldap_sasl_bind(ld, dn, NULL, &cred, NULL, 0, NULL, 0);
 988 }
 989
 990 /*****************************************************************************/
 991
 992 /* can't use isalpha() as only a strict set is valid for LDAP */
 993
 994 static bool tldap_is_alpha(char c)
 995 {
 996         return (((c >= 'a') && (c <= 'z')) || \
 997                 ((c >= 'A') && (c <= 'Z')));
 998 }
 999
1000 static bool tldap_is_adh(char c)
1001 {
1002         return tldap_is_alpha(c) || isdigit(c) || (c == '-');
1003 }
1004
1005 #define TLDAP_FILTER_AND  ASN1_CONTEXT(0)
1006 #define TLDAP_FILTER_OR   ASN1_CONTEXT(1)
1007 #define TLDAP_FILTER_NOT  ASN1_CONTEXT(2)
1008 #define TLDAP_FILTER_EQ   ASN1_CONTEXT(3)
1009 #define TLDAP_FILTER_SUB  ASN1_CONTEXT(4)
1010 #define TLDAP_FILTER_LE   ASN1_CONTEXT(5)
1011 #define TLDAP_FILTER_GE   ASN1_CONTEXT(6)
1012 #define TLDAP_FILTER_PRES ASN1_CONTEXT_SIMPLE(7)
1013 #define TLDAP_FILTER_APX  ASN1_CONTEXT(8)
1014 #define TLDAP_FILTER_EXT  ASN1_CONTEXT(9)
1015
1016 #define TLDAP_SUB_INI ASN1_CONTEXT_SIMPLE(0)
1017 #define TLDAP_SUB_ANY ASN1_CONTEXT_SIMPLE(1)
1018 #define TLDAP_SUB_FIN ASN1_CONTEXT_SIMPLE(2)
1019
1020
1021 /* oid's should be numerical only in theory,
1022  * but apparently some broken servers may have alphanum aliases instead.
1023  * Do like openldap libraries and allow alphanum aliases for oids, but
1024  * do not allow Tagging options in that case.
1025  */
1026 static bool tldap_is_attrdesc(const char *s, int len, bool no_tagopts)
1027 {
1028         bool is_oid = false;
1029         bool dot = false;
1030         int i;
1031
1032         /* first char has stricter rules */
1033         if (isdigit(*s)) {
1034                 is_oid = true;
1035         } else if (!tldap_is_alpha(*s)) {
1036                 /* bad first char */
1037                 return false;
1038         }
1039
1040         for (i = 1; i < len; i++) {
1041
1042                 if (is_oid) {
1043                         if (isdigit(s[i])) {
1044                                 dot = false;
1045                                 continue;
1046                         }
1047                         if (s[i] == '.') {
1048                                 if (dot) {
1049                                         /* malformed */
1050                                         return false;
1051                                 }
1052                                 dot = true;
1053                                 continue;
1054                         }
1055                 } else {
1056                         if (tldap_is_adh(s[i])) {
1057                                 continue;
1058                         }
1059                 }
1060
1061                 if (s[i] == ';') {
1062                         if (no_tagopts) {
1063                                 /* no tagging options */
1064                                 return false;
1065                         }
1066                         if (dot) {
1067                                 /* malformed */
1068                                 return false;
1069                         }
1070                         if ((i + 1) == len) {
1071                                 /* malformed */
1072                                 return false;
1073                         }
1074
1075                         is_oid = false;
1076                         continue;
1077                 }
1078         }
1079
1080         if (dot) {
1081                 /* malformed */
1082                 return false;
1083         }
1084
1085         return true;
1086 }
1087
1088 /* this function copies the value until the closing parenthesis is found. */
1089 static char *tldap_get_val(TALLOC_CTX *memctx,
1090                            const char *value, const char **_s)
1091 {
1092         const char *s = value;
1093
1094         /* find terminator */
1095         while (*s) {
1096                 s = strchr(s, ')');
1097                 if (s && (*(s - 1) == '\\')) {
1098                         continue;
1099                 }
1100                 break;
1101         }
1102         if (!s || !(*s == ')')) {
1103                 /* malformed filter */
1104                 return NULL;
1105         }
1106
1107         *_s = s;
1108
1109         return talloc_strndup(memctx, value, s - value);
1110 }
1111
1112 static int tldap_hex2char(const char *x)
1113 {
1114         if (isxdigit(x[0]) && isxdigit(x[1])) {
1115                 const char h1 = x[0], h2 = x[1];
1116                 int c = 0;
1117
1118                 if (h1 >= 'a') c = h1 - (int)'a' + 10;
1119                 else if (h1 >= 'A') c = h1 - (int)'A' + 10;
1120                 else if (h1 >= '0') c = h1 - (int)'0';
1121                 c = c << 4;
1122                 if (h2 >= 'a') c += h2 - (int)'a' + 10;
1123                 else if (h2 >= 'A') c += h2 - (int)'A' + 10;
1124                 else if (h2 >= '0') c += h2 - (int)'0';
1125
1126                 return c;
1127         }
1128
1129         return -1;
1130 }
1131
1132 static bool tldap_find_first_star(const char *val, const char **star)
1133 {
1134         const char *s;
1135
1136         for (s = val; *s; s++) {
1137                 switch (*s) {
1138                 case '\\':
1139                         if (isxdigit(s[1]) && isxdigit(s[2])) {
1140                                 s += 2;
1141                                 break;
1142                         }
1143                         /* not hex based escape, check older syntax */
1144                         switch (s[1]) {
1145                         case '(':
1146                         case ')':
1147                         case '*':
1148                         case '\\':
1149                                 s++;
1150                                 break;
1151                         default:
1152                                 /* invalid escape sequence */
1153                                 return false;
1154                         }
1155                         break;
1156                 case ')':
1157                         /* end of val, nothing found */
1158                         *star = s;
1159                         return true;
1160
1161                 case '*':
1162                         *star = s;
1163                         return true;
1164                 }
1165         }
1166
1167         /* string ended without closing parenthesis, filter is malformed */
1168         return false;
1169 }
1170
1171 static bool tldap_unescape_inplace(char *value, size_t *val_len)
1172 {
1173         int c, i, p;
1174
1175         for (i = 0,p = 0; i < *val_len; i++) {
1176
1177                 switch (value[i]) {
1178                 case '(':
1179                 case ')':
1180                 case '*':
1181                         /* these must be escaped */
1182                         return false;
1183
1184                 case '\\':
1185                         if (!value[i + 1]) {
1186                                 /* invalid EOL */
1187                                 return false;
1188                         }
1189                         i++;
1190
1191                         c = tldap_hex2char(&value[i]);
1192                         if (c >= 0 && c < 256) {
1193                                 value[p] = c;
1194                                 i++;
1195                                 p++;
1196                                 break;
1197                         }
1198
1199                         switch (value[i]) {
1200                         case '(':
1201                         case ')':
1202                         case '*':
1203                         case '\\':
1204                                 value[p] = value[i];
1205                                 p++;
1206                         default:
1207                                 /* invalid */
1208                                 return false;
1209                         }
1210                         break;
1211
1212                 default:
1213                         value[p] = value[i];
1214                         p++;
1215                 }
1216         }
1217         value[p] = '\0';
1218         *val_len = p;
1219         return true;
1220 }
1221
1222 static bool tldap_push_filter_basic(struct tldap_context *ld,
1223                                     struct asn1_data *data,
1224                                     const char **_s);
1225 static bool tldap_push_filter_substring(struct tldap_context *ld,
1226                                         struct asn1_data *data,
1227                                         const char *val,
1228                                         const char **_s);
1229 static bool tldap_push_filter_int(struct tldap_context *ld,
1230                                   struct asn1_data *data,
1231                                   const char **_s)
1232 {
1233         const char *s = *_s;
1234         bool ret;
1235
1236         if (*s != '(') {
1237                 tldap_debug(ld, TLDAP_DEBUG_ERROR,
1238                             "Incomplete or malformed filter\n");
1239                 return false;
1240         }
1241         s++;
1242
1243         /* we are right after a parenthesis,
1244          * find out what op we have at hand */
1245         switch (*s) {
1246         case '&':
1247                 tldap_debug(ld, TLDAP_DEBUG_TRACE, "Filter op: AND\n");
1248                 if (!asn1_push_tag(data, TLDAP_FILTER_AND)) return false;
1249                 s++;
1250                 break;
1251
1252         case '|':
1253                 tldap_debug(ld, TLDAP_DEBUG_TRACE, "Filter op: OR\n");
1254                 if (!asn1_push_tag(data, TLDAP_FILTER_OR)) return false;
1255                 s++;
1256                 break;
1257
1258         case '!':
1259                 tldap_debug(ld, TLDAP_DEBUG_TRACE, "Filter op: NOT\n");
1260                 if (!asn1_push_tag(data, TLDAP_FILTER_NOT)) return false;
1261                 s++;
1262                 ret = tldap_push_filter_int(ld, data, &s);
1263                 if (!ret) {
1264                         return false;
1265                 }
1266                 if (!asn1_pop_tag(data)) return false;
1267                 goto done;
1268
1269         case '(':
1270         case ')':
1271                 tldap_debug(ld, TLDAP_DEBUG_ERROR,
1272                             "Invalid parenthesis '%c'\n", *s);
1273                 return false;
1274
1275         case '\0':
1276                 tldap_debug(ld, TLDAP_DEBUG_ERROR,
1277                             "Invalid filter termination\n");
1278                 return false;
1279
1280         default:
1281                 ret = tldap_push_filter_basic(ld, data, &s);
1282                 if (!ret) {
1283                         return false;
1284                 }
1285                 goto done;
1286         }
1287
1288         /* only and/or filters get here.
1289          * go through the list of filters */
1290
1291         if (*s == ')') {
1292                 /* RFC 4526: empty and/or */
1293                 if (!asn1_pop_tag(data)) return false;
1294                 goto done;
1295         }
1296
1297         while (*s) {
1298                 ret = tldap_push_filter_int(ld, data, &s);
1299                 if (!ret) {
1300                         return false;
1301                 }
1302
1303                 if (*s == ')') {
1304                         /* end of list, return */
1305                         if (!asn1_pop_tag(data)) return false;
1306                         break;
1307                 }
1308         }
1309
1310 done:
1311         if (*s != ')') {
1312                 tldap_debug(ld, TLDAP_DEBUG_ERROR,
1313                             "Incomplete or malformed filter\n");
1314                 return false;
1315         }
1316         s++;
1317
1318         if (asn1_has_error(data)) {
1319                 return false;
1320         }
1321
1322         *_s = s;
1323         return true;
1324 }
1325
1326
1327 static bool tldap_push_filter_basic(struct tldap_context *ld,
1328                                     struct asn1_data *data,
1329                                     const char **_s)
1330 {
1331         TALLOC_CTX *tmpctx = talloc_tos();
1332         const char *s = *_s;
1333         const char *e;
1334         const char *eq;
1335         const char *val;
1336         const char *type;
1337         const char *dn;
1338         const char *rule;
1339         const char *star;
1340         size_t type_len = 0;
1341         char *uval;
1342         size_t uval_len;
1343         bool write_octect = true;
1344         bool ret;
1345
1346         eq = strchr(s, '=');
1347         if (!eq) {
1348                 tldap_debug(ld, TLDAP_DEBUG_ERROR,
1349                             "Invalid filter, missing equal sign\n");
1350                 return false;
1351         }
1352
1353         val = eq + 1;
1354         e = eq - 1;
1355
1356         switch (*e) {
1357         case '<':
1358                 if (!asn1_push_tag(data, TLDAP_FILTER_LE)) return false;
1359                 break;
1360
1361         case '>':
1362                 if (!asn1_push_tag(data, TLDAP_FILTER_GE)) return false;
1363                 break;
1364
1365         case '~':
1366                 if (!asn1_push_tag(data, TLDAP_FILTER_APX)) return false;
1367                 break;
1368
1369         case ':':
1370                 if (!asn1_push_tag(data, TLDAP_FILTER_EXT)) return false;
1371                 write_octect = false;
1372
1373                 type = NULL;
1374                 dn = NULL;
1375                 rule = NULL;
1376
1377                 if (*s == ':') { /* [:dn]:rule:= value */
1378                         if (s == e) {
1379                                 /* malformed filter */
1380                                 return false;
1381                         }
1382                         dn = s;
1383                 } else { /* type[:dn][:rule]:= value */
1384                         type = s;
1385                         dn = strchr(s, ':');
1386                         type_len = dn - type;
1387                         if (dn == e) { /* type:= value */
1388                                 dn = NULL;
1389                         }
1390                 }
1391                 if (dn) {
1392                         dn++;
1393
1394                         rule = strchr(dn, ':');
1395                         if (rule == NULL) {
1396                                 return false;
1397                         }
1398                         if ((rule == dn + 1) || rule + 1 == e) {
1399                                 /* malformed filter, contains "::" */
1400                                 return false;
1401                         }
1402
1403                         if (strncasecmp_m(dn, "dn:", 3) != 0) {
1404                                 if (rule == e) {
1405                                         rule = dn;
1406                                         dn = NULL;
1407                                 } else {
1408                                         /* malformed filter. With two
1409                                          * optionals, the first must be "dn"
1410                                          */
1411                                         return false;
1412                                 }
1413                         } else {
1414                                 if (rule == e) {
1415                                         rule = NULL;
1416                                 } else {
1417                                         rule++;
1418                                 }
1419                         }
1420                 }
1421
1422                 if (!type && !dn && !rule) {
1423                         /* malformed filter, there must be at least one */
1424                         return false;
1425                 }
1426
1427                 /*
1428                   MatchingRuleAssertion ::= SEQUENCE {
1429                   matchingRule    [1] MatchingRuleID OPTIONAL,
1430                   type      [2] AttributeDescription OPTIONAL,
1431                   matchValue      [3] AssertionValue,
1432                   dnAttributes    [4] BOOLEAN DEFAULT FALSE
1433                   }
1434                 */
1435
1436                 /* check and add rule */
1437                 if (rule) {
1438                         ret = tldap_is_attrdesc(rule, e - rule, true);
1439                         if (!ret) {
1440                                 return false;
1441                         }
1442                         if (!asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(1))) return false;
1443                         if (!asn1_write(data, rule, e - rule)) return false;
1444                         if (!asn1_pop_tag(data)) return false;
1445                 }
1446
1447                 /* check and add type */
1448                 if (type) {
1449                         ret = tldap_is_attrdesc(type, type_len, false);
1450                         if (!ret) {
1451                                 return false;
1452                         }
1453                         if (!asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(2))) return false;
1454                         if (!asn1_write(data, type, type_len)) return false;
1455                         if (!asn1_pop_tag(data)) return false;
1456                 }
1457
1458                 uval = tldap_get_val(tmpctx, val, _s);
1459                 if (!uval) {
1460                         return false;
1461                 }
1462                 uval_len = *_s - val;
1463                 ret = tldap_unescape_inplace(uval, &uval_len);
1464                 if (!ret) {
1465                         return false;
1466                 }
1467
1468                 if (!asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(3))) return false;
1469                 if (!asn1_write(data, uval, uval_len)) return false;
1470                 if (!asn1_pop_tag(data)) return false;
1471
1472                 if (!asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(4))) return false;
1473                 if (!asn1_write_uint8(data, dn?1:0)) return false;
1474                 if (!asn1_pop_tag(data)) return false;
1475                 break;
1476
1477         default:
1478                 e = eq;
1479
1480                 ret = tldap_is_attrdesc(s, e - s, false);
1481                 if (!ret) {
1482                         return false;
1483                 }
1484
1485                 if (strncmp(val, "*)", 2) == 0) {
1486                         /* presence */
1487                         if (!asn1_push_tag(data, TLDAP_FILTER_PRES)) return false;
1488                         if (!asn1_write(data, s, e - s)) return false;
1489                         *_s = val + 1;
1490                         write_octect = false;
1491                         break;
1492                 }
1493
1494                 ret = tldap_find_first_star(val, &star);
1495                 if (!ret) {
1496                         return false;
1497                 }
1498                 if (*star == '*') {
1499                         /* substring */
1500                         if (!asn1_push_tag(data, TLDAP_FILTER_SUB)) return false;
1501                         if (!asn1_write_OctetString(data, s, e - s)) return false;
1502                         ret = tldap_push_filter_substring(ld, data, val, &s);
1503                         if (!ret) {
1504                                 return false;
1505                         }
1506                         *_s = s;
1507                         write_octect = false;
1508                         break;
1509                 }
1510
1511                 /* if nothing else, then it is just equality */
1512                 if (!asn1_push_tag(data, TLDAP_FILTER_EQ)) return false;
1513                 write_octect = true;
1514                 break;
1515         }
1516
1517         if (write_octect) {
1518                 uval = tldap_get_val(tmpctx, val, _s);
1519                 if (!uval) {
1520                         return false;
1521                 }
1522                 uval_len = *_s - val;
1523                 ret = tldap_unescape_inplace(uval, &uval_len);
1524                 if (!ret) {
1525                         return false;
1526                 }
1527
1528                 if (!asn1_write_OctetString(data, s, e - s)) return false;
1529                 if (!asn1_write_OctetString(data, uval, uval_len)) return false;
1530         }
1531
1532         if (asn1_has_error(data)) {
1533                 return false;
1534         }
1535         return asn1_pop_tag(data);
1536 }
1537
1538 static bool tldap_push_filter_substring(struct tldap_context *ld,
1539                                         struct asn1_data *data,
1540                                         const char *val,
1541                                         const char **_s)
1542 {
1543         TALLOC_CTX *tmpctx = talloc_tos();
1544         bool initial = true;
1545         const char *star;
1546         char *chunk;
1547         size_t chunk_len;
1548         bool ret;
1549
1550         /*
1551           SubstringFilter ::= SEQUENCE {
1552                   type      AttributeDescription,
1553                   -- at least one must be present
1554                   substrings      SEQUENCE OF CHOICE {
1555                           initial [0] LDAPString,
1556                           any     [1] LDAPString,
1557                           final   [2] LDAPString } }
1558         */
1559         if (!asn1_push_tag(data, ASN1_SEQUENCE(0))) return false;
1560
1561         do {
1562                 ret = tldap_find_first_star(val, &star);
1563                 if (!ret) {
1564                         return false;
1565                 }
1566                 chunk_len = star - val;
1567
1568                 switch (*star) {
1569                 case '*':
1570                         if (!initial && chunk_len == 0) {
1571                                 /* found '**', which is illegal */
1572                                 return false;
1573                         }
1574                         break;
1575                 case ')':
1576                         if (initial) {
1577                                 /* no stars ?? */
1578                                 return false;
1579                         }
1580                         /* we are done */
1581                         break;
1582                 default:
1583                         /* ?? */
1584                         return false;
1585                 }
1586
1587                 if (initial && chunk_len == 0) {
1588                         val = star + 1;
1589                         initial = false;
1590                         continue;
1591                 }
1592
1593                 chunk = talloc_strndup(tmpctx, val, chunk_len);
1594                 if (!chunk) {
1595                         return false;
1596                 }
1597                 ret = tldap_unescape_inplace(chunk, &chunk_len);
1598                 if (!ret) {
1599                         return false;
1600                 }
1601                 switch (*star) {
1602                 case '*':
1603                         if (initial) {
1604                                 if (!asn1_push_tag(data, TLDAP_SUB_INI)) return false;
1605                                 initial = false;
1606                         } else {
1607                                 if (!asn1_push_tag(data, TLDAP_SUB_ANY)) return false;
1608                         }
1609                         break;
1610                 case ')':
1611                         if (!asn1_push_tag(data, TLDAP_SUB_FIN)) return false;
1612                         break;
1613                 default:
1614                         /* ?? */
1615                         return false;
1616                 }
1617                 if (!asn1_write(data, chunk, chunk_len)) return false;
1618                 if (!asn1_pop_tag(data)) return false;
1619
1620                 val = star + 1;
1621
1622         } while (*star == '*');
1623
1624         *_s = star;
1625
1626         /* end of sequence */
1627         return asn1_pop_tag(data);
1628 }
1629
1630 /* NOTE: although openldap libraries allow for spaces in some places, mosly
1631  * around parenthesis, we do not allow any spaces (except in values of
1632  * course) as I couldn't fine any place in RFC 4512 or RFC 4515 where
1633  * leading or trailing spaces where allowed.
1634  */
1635 static bool tldap_push_filter(struct tldap_context *ld,
1636                               struct asn1_data *data,
1637                               const char *filter)
1638 {
1639         const char *s = filter;
1640         bool ret;
1641
1642         ret = tldap_push_filter_int(ld, data, &s);
1643         if (ret && *s) {
1644                 tldap_debug(ld, TLDAP_DEBUG_ERROR,
1645                             "Incomplete or malformed filter\n");
1646                 return false;
1647         }
1648         return ret;
1649 }
1650
1651 /*****************************************************************************/
1652
1653 static void tldap_search_done(struct tevent_req *subreq);
1654
1655 struct tevent_req *tldap_search_send(TALLOC_CTX *mem_ctx,
1656                                      struct tevent_context *ev,
1657                                      struct tldap_context *ld,
1658                                      const char *base, int scope,
1659                                      const char *filter,
1660                                      const char **attrs,
1661                                      int num_attrs,
1662                                      int attrsonly,
1663                                      struct tldap_control *sctrls,
1664                                      int num_sctrls,
1665                                      struct tldap_control *cctrls,
1666                                      int num_cctrls,
1667                                      int timelimit,
1668                                      int sizelimit,
1669                                      int deref)
1670 {
1671         struct tevent_req *req, *subreq;
1672         struct tldap_req_state *state;
1673         int i;
1674
1675         req = tldap_req_create(mem_ctx, ld, &state);
1676         if (req == NULL) {
1677                 return NULL;
1678         }
1679
1680         if (!asn1_push_tag(state->out, TLDAP_REQ_SEARCH)) goto encoding_error;
1681         if (!asn1_write_OctetString(state->out, base, strlen(base))) goto encoding_error;
1682         if (!asn1_write_enumerated(state->out, scope)) goto encoding_error;
1683         if (!asn1_write_enumerated(state->out, deref)) goto encoding_error;
1684         if (!asn1_write_Integer(state->out, sizelimit)) goto encoding_error;
1685         if (!asn1_write_Integer(state->out, timelimit)) goto encoding_error;
1686         if (!asn1_write_BOOLEAN(state->out, attrsonly)) goto encoding_error;
1687
1688         if (!tldap_push_filter(ld, state->out, filter)) {
1689                 goto encoding_error;
1690         }
1691
1692         if (!asn1_push_tag(state->out, ASN1_SEQUENCE(0))) goto encoding_error;
1693         for (i=0; i<num_attrs; i++) {
1694                 if (!asn1_write_OctetString(state->out, attrs[i], strlen(attrs[i]))) goto encoding_error;
1695         }
1696         if (!asn1_pop_tag(state->out)) goto encoding_error;
1697         if (!asn1_pop_tag(state->out)) goto encoding_error;
1698
1699         subreq = tldap_msg_send(state, ev, ld, state->id, state->out,
1700                                 sctrls, num_sctrls);
1701         if (tevent_req_nomem(subreq, req)) {
1702                 return tevent_req_post(req, ev);
1703         }
1704         tevent_req_set_callback(subreq, tldap_search_done, req);
1705         return req;
1706
1707  encoding_error:
1708         tevent_req_error(req, TLDAP_ENCODING_ERROR);
1709         return tevent_req_post(req, ev);
1710 }
1711
1712 static void tldap_search_done(struct tevent_req *subreq)
1713 {
1714         struct tevent_req *req = tevent_req_callback_data(
1715                 subreq, struct tevent_req);
1716         struct tldap_req_state *state = tevent_req_data(
1717                 req, struct tldap_req_state);
1718         int err;
1719
1720         err = tldap_msg_recv(subreq, state, &state->result);
1721         if (err != TLDAP_SUCCESS) {
1722                 tevent_req_error(req, err);
1723                 return;
1724         }
1725         switch (state->result->type) {
1726         case TLDAP_RES_SEARCH_ENTRY:
1727         case TLDAP_RES_SEARCH_REFERENCE:
1728                 if (!tldap_msg_set_pending(subreq)) {
1729                         tevent_req_oom(req);
1730                         return;
1731                 }
1732                 tevent_req_notify_callback(req);
1733                 break;
1734         case TLDAP_RES_SEARCH_RESULT:
1735                 TALLOC_FREE(subreq);
1736                 if (!asn1_start_tag(state->result->data,
1737                                     state->result->type) ||
1738                     !tldap_decode_response(state) ||
1739                     !asn1_end_tag(state->result->data) ||
1740                     !tldap_decode_controls(state)) {
1741                         tevent_req_error(req, TLDAP_DECODING_ERROR);
1742                         return;
1743                 }
1744                 tevent_req_done(req);
1745                 break;
1746         default:
1747                 tevent_req_error(req, TLDAP_PROTOCOL_ERROR);
1748                 return;
1749         }
1750 }
1751
1752 int tldap_search_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
1753                       struct tldap_message **pmsg)
1754 {
1755         struct tldap_req_state *state = tevent_req_data(
1756                 req, struct tldap_req_state);
1757         int err;
1758
1759         if (!tevent_req_is_in_progress(req)
1760             && tevent_req_is_ldap_error(req, &err)) {
1761                 return err;
1762         }
1763
1764         if (tevent_req_is_in_progress(req)) {
1765                 switch (state->result->type) {
1766                 case TLDAP_RES_SEARCH_ENTRY:
1767                 case TLDAP_RES_SEARCH_REFERENCE:
1768                         break;
1769                 default:
1770                         return TLDAP_OPERATIONS_ERROR;
1771                 }
1772         }
1773
1774         *pmsg = talloc_move(mem_ctx, &state->result);
1775         return TLDAP_SUCCESS;
1776 }
1777
1778 struct tldap_sync_search_state {
1779         TALLOC_CTX *mem_ctx;
1780         struct tldap_message **entries;
1781         struct tldap_message **refs;
1782         int rc;
1783 };
1784
1785 static void tldap_search_cb(struct tevent_req *req)
1786 {
1787         struct tldap_sync_search_state *state =
1788                 (struct tldap_sync_search_state *)
1789                 tevent_req_callback_data_void(req);
1790         struct tldap_message *msg, **tmp;
1791         int num_entries, num_refs;
1792
1793         state->rc = tldap_search_recv(req, talloc_tos(), &msg);
1794         if (state->rc != TLDAP_SUCCESS) {
1795                 return;
1796         }
1797
1798         switch (tldap_msg_type(msg)) {
1799         case TLDAP_RES_SEARCH_ENTRY:
1800                 num_entries = talloc_array_length(state->entries);
1801                 tmp = talloc_realloc(state->mem_ctx, state->entries,
1802                                      struct tldap_message *, num_entries + 1);
1803                 if (tmp == NULL) {
1804                         state->rc = TLDAP_NO_MEMORY;
1805                         return;
1806                 }
1807                 state->entries = tmp;
1808                 state->entries[num_entries] = talloc_move(state->entries,
1809                                                           &msg);
1810                 break;
1811         case TLDAP_RES_SEARCH_REFERENCE:
1812                 num_refs = talloc_array_length(state->refs);
1813                 tmp = talloc_realloc(state->mem_ctx, state->refs,
1814                                      struct tldap_message *, num_refs + 1);
1815                 if (tmp == NULL) {
1816                         state->rc = TLDAP_NO_MEMORY;
1817                         return;
1818                 }
1819                 state->refs = tmp;
1820                 state->refs[num_refs] = talloc_move(state->refs, &msg);
1821                 break;
1822         case TLDAP_RES_SEARCH_RESULT:
1823                 state->rc = TLDAP_SUCCESS;
1824                 break;
1825         default:
1826                 state->rc = TLDAP_PROTOCOL_ERROR;
1827                 break;
1828         }
1829 }
1830
1831 int tldap_search(struct tldap_context *ld,
1832                  const char *base, int scope, const char *filter,
1833                  const char **attrs, int num_attrs, int attrsonly,
1834                  struct tldap_control *sctrls, int num_sctrls,
1835                  struct tldap_control *cctrls, int num_cctrls,
1836                  int timelimit, int sizelimit, int deref,
1837                  TALLOC_CTX *mem_ctx, struct tldap_message ***entries,
1838                  struct tldap_message ***refs)
1839 {
1840         TALLOC_CTX *frame = talloc_stackframe();
1841         struct tevent_context *ev;
1842         struct tevent_req *req;
1843         struct tldap_sync_search_state state = {
1844                 .mem_ctx = mem_ctx, .rc = TLDAP_SUCCESS
1845         };
1846
1847         ev = samba_tevent_context_init(frame);
1848         if (ev == NULL) {
1849                 state.rc = TLDAP_NO_MEMORY;
1850                 goto fail;
1851         }
1852
1853         req = tldap_search_send(frame, ev, ld, base, scope, filter,
1854                                 attrs, num_attrs, attrsonly,
1855                                 sctrls, num_sctrls, cctrls, num_cctrls,
1856                                 timelimit, sizelimit, deref);
1857         if (req == NULL) {
1858                 state.rc = TLDAP_NO_MEMORY;
1859                 goto fail;
1860         }
1861
1862         tevent_req_set_callback(req, tldap_search_cb, &state);
1863
1864         if (!tevent_req_is_in_progress(req)) {
1865                 /* an error happend before sending */
1866                 if (tevent_req_is_ldap_error(req, &state.rc)) {
1867                         goto fail;
1868                 }
1869         }
1870
1871         while (tevent_req_is_in_progress(req)
1872                && (state.rc == TLDAP_SUCCESS)) {
1873                 if (tevent_loop_once(ev) == -1) {
1874                         return TLDAP_OPERATIONS_ERROR;
1875                 }
1876         }
1877
1878         if (state.rc != TLDAP_SUCCESS) {
1879                 return state.rc;
1880         }
1881
1882         if (entries != NULL) {
1883                 *entries = state.entries;
1884         } else {
1885                 TALLOC_FREE(state.entries);
1886         }
1887         if (refs != NULL) {
1888                 *refs = state.refs;
1889         } else {
1890                 TALLOC_FREE(state.refs);
1891         }
1892         tldap_save_msg(ld, req);
1893 fail:
1894         TALLOC_FREE(frame);
1895         return state.rc;
1896 }
1897
1898 static bool tldap_parse_search_entry(struct tldap_message *msg)
1899 {
1900         int num_attribs = 0;
1901
1902         if (!asn1_start_tag(msg->data, msg->type)) return false;
1903
1904         /* dn */
1905
1906         if (!asn1_read_OctetString_talloc(msg, msg->data, &msg->dn)) return false;
1907
1908         if (msg->dn == NULL) {
1909                 return false;
1910         }
1911
1912         /*
1913          * Attributes: We overallocate msg->attribs by one, so that while
1914          * looping over the attributes we can directly parse into the last
1915          * array element. Same for the values in the inner loop.
1916          */
1917
1918         msg->attribs = talloc_array(msg, struct tldap_attribute, 1);
1919         if (msg->attribs == NULL) {
1920                 return false;
1921         }
1922
1923         if (!asn1_start_tag(msg->data, ASN1_SEQUENCE(0))) return false;
1924         while (asn1_peek_tag(msg->data, ASN1_SEQUENCE(0))) {
1925                 struct tldap_attribute *attrib;
1926                 int num_values = 0;
1927
1928                 attrib = &msg->attribs[num_attribs];
1929                 attrib->values = talloc_array(msg->attribs, DATA_BLOB, 1);
1930                 if (attrib->values == NULL) {
1931                         return false;
1932                 }
1933                 if (!asn1_start_tag(msg->data, ASN1_SEQUENCE(0))) return false;
1934                 if (!asn1_read_OctetString_talloc(msg->attribs, msg->data,
1935                                              &attrib->name)) return false;
1936                 if (!asn1_start_tag(msg->data, ASN1_SET)) return false;
1937
1938                 while (asn1_peek_tag(msg->data, ASN1_OCTET_STRING)) {
1939                         if (!asn1_read_OctetString(msg->data, msg,
1940                                               &attrib->values[num_values])) return false;
1941
1942                         attrib->values = talloc_realloc(
1943                                 msg->attribs, attrib->values, DATA_BLOB,
1944                                 num_values + 2);
1945                         if (attrib->values == NULL) {
1946                                 return false;
1947                         }
1948                         num_values += 1;
1949                 }
1950                 attrib->values = talloc_realloc(msg->attribs, attrib->values,
1951                                                 DATA_BLOB, num_values);
1952                 attrib->num_values = num_values;
1953
1954                 if (!asn1_end_tag(msg->data)) return false; /* ASN1_SET */
1955                 if (!asn1_end_tag(msg->data)) return false; /* ASN1_SEQUENCE(0) */
1956                 msg->attribs = talloc_realloc(
1957                         msg, msg->attribs, struct tldap_attribute,
1958                         num_attribs + 2);
1959                 if (msg->attribs == NULL) {
1960                         return false;
1961                 }
1962                 num_attribs += 1;
1963         }
1964         msg->attribs = talloc_realloc(
1965                 msg, msg->attribs, struct tldap_attribute, num_attribs);
1966         return asn1_end_tag(msg->data);
1967 }
1968
1969 bool tldap_entry_dn(struct tldap_message *msg, char **dn)
1970 {
1971         if ((msg->dn == NULL) && (!tldap_parse_search_entry(msg))) {
1972                 return false;
1973         }
1974         *dn = msg->dn;
1975         return true;
1976 }
1977
1978 bool tldap_entry_attributes(struct tldap_message *msg,
1979                             struct tldap_attribute **attributes,
1980                             int *num_attributes)
1981 {
1982         if ((msg->dn == NULL) && (!tldap_parse_search_entry(msg))) {
1983                 return false;
1984         }
1985         *attributes = msg->attribs;
1986         *num_attributes = talloc_array_length(msg->attribs);
1987         return true;
1988 }
1989
1990 static bool tldap_decode_controls(struct tldap_req_state *state)
1991 {
1992         struct tldap_message *msg = state->result;
1993         struct asn1_data *data = msg->data;
1994         struct tldap_control *sctrls = NULL;
1995         int num_controls = 0;
1996         bool ret = false;
1997
1998         msg->res_sctrls = NULL;
1999
2000         if (!asn1_peek_tag(data, ASN1_CONTEXT(0))) {
2001                 return true;
2002         }
2003
2004         if (!asn1_start_tag(data, ASN1_CONTEXT(0))) goto out;
2005
2006         while (asn1_peek_tag(data, ASN1_SEQUENCE(0))) {
2007                 struct tldap_control *c;
2008                 char *oid = NULL;
2009
2010                 sctrls = talloc_realloc(msg, sctrls, struct tldap_control,
2011                                         num_controls + 1);
2012                 if (sctrls == NULL) {
2013                         goto out;
2014                 }
2015                 c = &sctrls[num_controls];
2016
2017                 if (!asn1_start_tag(data, ASN1_SEQUENCE(0))) goto out;
2018                 if (!asn1_read_OctetString_talloc(msg, data, &oid)) goto out;
2019                 if (asn1_has_error(data) || (oid == NULL)) {
2020                         goto out;
2021                 }
2022                 c->oid = oid;
2023                 if (asn1_peek_tag(data, ASN1_BOOLEAN)) {
2024                         if (!asn1_read_BOOLEAN(data, &c->critical)) goto out;
2025                 } else {
2026                         c->critical = false;
2027                 }
2028                 c->value = data_blob_null;
2029                 if (asn1_peek_tag(data, ASN1_OCTET_STRING) &&
2030                     !asn1_read_OctetString(data, msg, &c->value)) {
2031                         goto out;
2032                 }
2033                 if (!asn1_end_tag(data)) goto out; /* ASN1_SEQUENCE(0) */
2034
2035                 num_controls += 1;
2036         }
2037
2038         if (!asn1_end_tag(data)) goto out;      /* ASN1_CONTEXT(0) */
2039
2040         ret = true;
2041
2042  out:
2043
2044         if (ret == false) {
2045                 TALLOC_FREE(sctrls);
2046         } else {
2047                 msg->res_sctrls = sctrls;
2048         }
2049         return ret;
2050 }
2051
2052 static void tldap_simple_done(struct tevent_req *subreq, int type)
2053 {
2054         struct tevent_req *req = tevent_req_callback_data(
2055                 subreq, struct tevent_req);
2056         struct tldap_req_state *state = tevent_req_data(
2057                 req, struct tldap_req_state);
2058         int err;
2059
2060         err = tldap_msg_recv(subreq, state, &state->result);
2061         TALLOC_FREE(subreq);
2062         if (err != TLDAP_SUCCESS) {
2063                 tevent_req_error(req, err);
2064                 return;
2065         }
2066         if (state->result->type != type) {
2067                 tevent_req_error(req, TLDAP_PROTOCOL_ERROR);
2068                 return;
2069         }
2070         if (!asn1_start_tag(state->result->data, state->result->type) ||
2071             !tldap_decode_response(state) ||
2072             !asn1_end_tag(state->result->data) ||
2073             !tldap_decode_controls(state)) {
2074                 tevent_req_error(req, TLDAP_DECODING_ERROR);
2075                 return;
2076         }
2077         if (state->result->lderr != TLDAP_SUCCESS) {
2078                 tevent_req_error(req, state->result->lderr);
2079                 return;
2080         }
2081         tevent_req_done(req);
2082 }
2083
2084 static int tldap_simple_recv(struct tevent_req *req)
2085 {
2086         int err;
2087         if (tevent_req_is_ldap_error(req, &err)) {
2088                 return err;
2089         }
2090         return TLDAP_SUCCESS;
2091 }
2092
2093 static void tldap_add_done(struct tevent_req *subreq);
2094
2095 struct tevent_req *tldap_add_send(TALLOC_CTX *mem_ctx,
2096                                   struct tevent_context *ev,
2097                                   struct tldap_context *ld,
2098                                   const char *dn,
2099                                   struct tldap_mod *attributes,
2100                                   int num_attributes,
2101                                   struct tldap_control *sctrls,
2102                                   int num_sctrls,
2103                                   struct tldap_control *cctrls,
2104                                   int num_cctrls)
2105 {
2106         struct tevent_req *req, *subreq;
2107         struct tldap_req_state *state;
2108         int i, j;
2109
2110         req = tldap_req_create(mem_ctx, ld, &state);
2111         if (req == NULL) {
2112                 return NULL;
2113         }
2114
2115         if (!asn1_push_tag(state->out, TLDAP_REQ_ADD)) goto err;
2116         if (!asn1_write_OctetString(state->out, dn, strlen(dn))) goto err;
2117         if (!asn1_push_tag(state->out, ASN1_SEQUENCE(0))) goto err;
2118
2119         for (i=0; i<num_attributes; i++) {
2120                 struct tldap_mod *attrib = &attributes[i];
2121                 if (!asn1_push_tag(state->out, ASN1_SEQUENCE(0))) goto err;
2122                 if (!asn1_write_OctetString(state->out, attrib->attribute,
2123                                        strlen(attrib->attribute))) goto err;
2124                 if (!asn1_push_tag(state->out, ASN1_SET)) goto err;
2125                 for (j=0; j<attrib->num_values; j++) {
2126                         if (!asn1_write_OctetString(state->out,
2127                                                attrib->values[j].data,
2128                                                attrib->values[j].length)) goto err;
2129                 }
2130                 if (!asn1_pop_tag(state->out)) goto err;
2131                 if (!asn1_pop_tag(state->out)) goto err;
2132         }
2133
2134         if (!asn1_pop_tag(state->out)) goto err;
2135         if (!asn1_pop_tag(state->out)) goto err;
2136
2137         subreq = tldap_msg_send(state, ev, ld, state->id, state->out,
2138                                 sctrls, num_sctrls);
2139         if (tevent_req_nomem(subreq, req)) {
2140                 return tevent_req_post(req, ev);
2141         }
2142         tevent_req_set_callback(subreq, tldap_add_done, req);
2143         return req;
2144
2145   err:
2146
2147         tevent_req_error(req, TLDAP_ENCODING_ERROR);
2148         return tevent_req_post(req, ev);
2149 }
2150
2151 static void tldap_add_done(struct tevent_req *subreq)
2152 {
2153         tldap_simple_done(subreq, TLDAP_RES_ADD);
2154 }
2155
2156 int tldap_add_recv(struct tevent_req *req)
2157 {
2158         return tldap_simple_recv(req);
2159 }
2160
2161 int tldap_add(struct tldap_context *ld, const char *dn,
2162               struct tldap_mod *attributes, int num_attributes,
2163               struct tldap_control *sctrls, int num_sctrls,
2164               struct tldap_control *cctrls, int num_cctrls)
2165 {
2166         TALLOC_CTX *frame = talloc_stackframe();
2167         struct tevent_context *ev;
2168         struct tevent_req *req;
2169         int result;
2170
2171         ev = samba_tevent_context_init(frame);
2172         if (ev == NULL) {
2173                 result = TLDAP_NO_MEMORY;
2174                 goto fail;
2175         }
2176
2177         req = tldap_add_send(frame, ev, ld, dn, attributes, num_attributes,
2178                              sctrls, num_sctrls, cctrls, num_cctrls);
2179         if (req == NULL) {
2180                 result = TLDAP_NO_MEMORY;
2181                 goto fail;
2182         }
2183
2184         if (!tevent_req_poll(req, ev)) {
2185                 result = TLDAP_OPERATIONS_ERROR;
2186                 goto fail;
2187         }
2188
2189         result = tldap_add_recv(req);
2190         tldap_save_msg(ld, req);
2191  fail:
2192         TALLOC_FREE(frame);
2193         return result;
2194 }
2195
2196 static void tldap_modify_done(struct tevent_req *subreq);
2197
2198 struct tevent_req *tldap_modify_send(TALLOC_CTX *mem_ctx,
2199                                      struct tevent_context *ev,
2200                                      struct tldap_context *ld,
2201                                      const char *dn,
2202                                      struct tldap_mod *mods, int num_mods,
2203                                      struct tldap_control *sctrls,
2204                                      int num_sctrls,
2205                                      struct tldap_control *cctrls,
2206                                      int num_cctrls)
2207 {
2208         struct tevent_req *req, *subreq;
2209         struct tldap_req_state *state;
2210         int i, j;
2211
2212         req = tldap_req_create(mem_ctx, ld, &state);
2213         if (req == NULL) {
2214                 return NULL;
2215         }
2216
2217         if (!asn1_push_tag(state->out, TLDAP_REQ_MODIFY)) goto err;
2218         if (!asn1_write_OctetString(state->out, dn, strlen(dn))) goto err;
2219         if (!asn1_push_tag(state->out, ASN1_SEQUENCE(0))) goto err;
2220
2221         for (i=0; i<num_mods; i++) {
2222                 struct tldap_mod *mod = &mods[i];
2223                 if (!asn1_push_tag(state->out, ASN1_SEQUENCE(0))) goto err;
2224                 if (!asn1_write_enumerated(state->out, mod->mod_op)) goto err;
2225                 if (!asn1_push_tag(state->out, ASN1_SEQUENCE(0))) goto err;
2226                 if (!asn1_write_OctetString(state->out, mod->attribute,
2227                                        strlen(mod->attribute))) goto err;
2228                 if (!asn1_push_tag(state->out, ASN1_SET)) goto err;
2229                 for (j=0; j<mod->num_values; j++) {
2230                         if (!asn1_write_OctetString(state->out,
2231                                                mod->values[j].data,
2232                                                mod->values[j].length)) goto err;
2233                 }
2234                 if (!asn1_pop_tag(state->out)) goto err;
2235                 if (!asn1_pop_tag(state->out)) goto err;
2236                 if (!asn1_pop_tag(state->out)) goto err;
2237         }
2238
2239         if (!asn1_pop_tag(state->out)) goto err;
2240         if (!asn1_pop_tag(state->out)) goto err;
2241
2242         subreq = tldap_msg_send(state, ev, ld, state->id, state->out,
2243                                 sctrls, num_sctrls);
2244         if (tevent_req_nomem(subreq, req)) {
2245                 return tevent_req_post(req, ev);
2246         }
2247         tevent_req_set_callback(subreq, tldap_modify_done, req);
2248         return req;
2249
2250   err:
2251
2252         tevent_req_error(req, TLDAP_ENCODING_ERROR);
2253         return tevent_req_post(req, ev);
2254 }
2255
2256 static void tldap_modify_done(struct tevent_req *subreq)
2257 {
2258         tldap_simple_done(subreq, TLDAP_RES_MODIFY);
2259 }
2260
2261 int tldap_modify_recv(struct tevent_req *req)
2262 {
2263         return tldap_simple_recv(req);
2264 }
2265
2266 int tldap_modify(struct tldap_context *ld, const char *dn,
2267                  struct tldap_mod *mods, int num_mods,
2268                  struct tldap_control *sctrls, int num_sctrls,
2269                  struct tldap_control *cctrls, int num_cctrls)
2270  {
2271         TALLOC_CTX *frame = talloc_stackframe();
2272         struct tevent_context *ev;
2273         struct tevent_req *req;
2274         int result;
2275
2276         ev = samba_tevent_context_init(frame);
2277         if (ev == NULL) {
2278                 result = TLDAP_NO_MEMORY;
2279                 goto fail;
2280         }
2281
2282         req = tldap_modify_send(frame, ev, ld, dn, mods, num_mods,
2283                                 sctrls, num_sctrls, cctrls, num_cctrls);
2284         if (req == NULL) {
2285                 result = TLDAP_NO_MEMORY;
2286                 goto fail;
2287         }
2288
2289         if (!tevent_req_poll(req, ev)) {
2290                 result = TLDAP_OPERATIONS_ERROR;
2291                 goto fail;
2292         }
2293
2294         result = tldap_modify_recv(req);
2295         tldap_save_msg(ld, req);
2296  fail:
2297         TALLOC_FREE(frame);
2298         return result;
2299 }
2300
2301 static void tldap_delete_done(struct tevent_req *subreq);
2302
2303 struct tevent_req *tldap_delete_send(TALLOC_CTX *mem_ctx,
2304                                      struct tevent_context *ev,
2305                                      struct tldap_context *ld,
2306                                      const char *dn,
2307                                      struct tldap_control *sctrls,
2308                                      int num_sctrls,
2309                                      struct tldap_control *cctrls,
2310                                      int num_cctrls)
2311 {
2312         struct tevent_req *req, *subreq;
2313         struct tldap_req_state *state;
2314
2315         req = tldap_req_create(mem_ctx, ld, &state);
2316         if (req == NULL) {
2317                 return NULL;
2318         }
2319
2320         if (!asn1_push_tag(state->out, TLDAP_REQ_DELETE)) goto err;
2321         if (!asn1_write(state->out, dn, strlen(dn))) goto err;
2322         if (!asn1_pop_tag(state->out)) goto err;
2323
2324         subreq = tldap_msg_send(state, ev, ld, state->id, state->out,
2325                                 sctrls, num_sctrls);
2326         if (tevent_req_nomem(subreq, req)) {
2327                 return tevent_req_post(req, ev);
2328         }
2329         tevent_req_set_callback(subreq, tldap_delete_done, req);
2330         return req;
2331
2332   err:
2333
2334         tevent_req_error(req, TLDAP_ENCODING_ERROR);
2335         return tevent_req_post(req, ev);
2336 }
2337
2338 static void tldap_delete_done(struct tevent_req *subreq)
2339 {
2340         tldap_simple_done(subreq, TLDAP_RES_DELETE);
2341 }
2342
2343 int tldap_delete_recv(struct tevent_req *req)
2344 {
2345         return tldap_simple_recv(req);
2346 }
2347
2348 int tldap_delete(struct tldap_context *ld, const char *dn,
2349                  struct tldap_control *sctrls, int num_sctrls,
2350                  struct tldap_control *cctrls, int num_cctrls)
2351 {
2352         TALLOC_CTX *frame = talloc_stackframe();
2353         struct tevent_context *ev;
2354         struct tevent_req *req;
2355         int result;
2356
2357         ev = samba_tevent_context_init(frame);
2358         if (ev == NULL) {
2359                 result = TLDAP_NO_MEMORY;
2360                 goto fail;
2361         }
2362
2363         req = tldap_delete_send(frame, ev, ld, dn, sctrls, num_sctrls,
2364                                 cctrls, num_cctrls);
2365         if (req == NULL) {
2366                 result = TLDAP_NO_MEMORY;
2367                 goto fail;
2368         }
2369
2370         if (!tevent_req_poll(req, ev)) {
2371                 result = TLDAP_OPERATIONS_ERROR;
2372                 goto fail;
2373         }
2374
2375         result = tldap_delete_recv(req);
2376         tldap_save_msg(ld, req);
2377  fail:
2378         TALLOC_FREE(frame);
2379         return result;
2380 }
2381
2382 int tldap_msg_id(const struct tldap_message *msg)
2383 {
2384         return msg->id;
2385 }
2386
2387 int tldap_msg_type(const struct tldap_message *msg)
2388 {
2389         return msg->type;
2390 }
2391
2392 const char *tldap_msg_matcheddn(struct tldap_message *msg)
2393 {
2394         if (msg == NULL) {
2395                 return NULL;
2396         }
2397         return msg->res_matcheddn;
2398 }
2399
2400 const char *tldap_msg_diagnosticmessage(struct tldap_message *msg)
2401 {
2402         if (msg == NULL) {
2403                 return NULL;
2404         }
2405         return msg->res_diagnosticmessage;
2406 }
2407
2408 const char *tldap_msg_referral(struct tldap_message *msg)
2409 {
2410         if (msg == NULL) {
2411                 return NULL;
2412         }
2413         return msg->res_referral;
2414 }
2415
2416 void tldap_msg_sctrls(struct tldap_message *msg, int *num_sctrls,
2417                       struct tldap_control **sctrls)
2418 {
2419         if (msg == NULL) {
2420                 *sctrls = NULL;
2421                 *num_sctrls = 0;
2422                 return;
2423         }
2424         *sctrls = msg->res_sctrls;
2425         *num_sctrls = talloc_array_length(msg->res_sctrls);
2426 }
2427
2428 struct tldap_message *tldap_ctx_lastmsg(struct tldap_context *ld)
2429 {
2430         return ld->last_msg;
2431 }
2432
2433 const char *tldap_err2string(int rc)
2434 {
2435         const char *res = NULL;
2436
2437         /*
2438          * This would normally be a table, but the error codes are not fully
2439          * sequential. Let the compiler figure out the optimum implementation
2440          * :-)
2441          */
2442
2443         switch (rc) {
2444         case TLDAP_SUCCESS:
2445                 res = "TLDAP_SUCCESS";
2446                 break;
2447         case TLDAP_OPERATIONS_ERROR:
2448                 res = "TLDAP_OPERATIONS_ERROR";
2449                 break;
2450         case TLDAP_PROTOCOL_ERROR:
2451                 res = "TLDAP_PROTOCOL_ERROR";
2452                 break;
2453         case TLDAP_TIMELIMIT_EXCEEDED:
2454                 res = "TLDAP_TIMELIMIT_EXCEEDED";
2455                 break;
2456         case TLDAP_SIZELIMIT_EXCEEDED:
2457                 res = "TLDAP_SIZELIMIT_EXCEEDED";
2458                 break;
2459         case TLDAP_COMPARE_FALSE:
2460                 res = "TLDAP_COMPARE_FALSE";
2461                 break;
2462         case TLDAP_COMPARE_TRUE:
2463                 res = "TLDAP_COMPARE_TRUE";
2464                 break;
2465         case TLDAP_STRONG_AUTH_NOT_SUPPORTED:
2466                 res = "TLDAP_STRONG_AUTH_NOT_SUPPORTED";
2467                 break;
2468         case TLDAP_STRONG_AUTH_REQUIRED:
2469                 res = "TLDAP_STRONG_AUTH_REQUIRED";
2470                 break;
2471         case TLDAP_REFERRAL:
2472                 res = "TLDAP_REFERRAL";
2473                 break;
2474         case TLDAP_ADMINLIMIT_EXCEEDED:
2475                 res = "TLDAP_ADMINLIMIT_EXCEEDED";
2476                 break;
2477         case TLDAP_UNAVAILABLE_CRITICAL_EXTENSION:
2478                 res = "TLDAP_UNAVAILABLE_CRITICAL_EXTENSION";
2479                 break;
2480         case TLDAP_CONFIDENTIALITY_REQUIRED:
2481                 res = "TLDAP_CONFIDENTIALITY_REQUIRED";
2482                 break;
2483         case TLDAP_SASL_BIND_IN_PROGRESS:
2484                 res = "TLDAP_SASL_BIND_IN_PROGRESS";
2485                 break;
2486         case TLDAP_NO_SUCH_ATTRIBUTE:
2487                 res = "TLDAP_NO_SUCH_ATTRIBUTE";
2488                 break;
2489         case TLDAP_UNDEFINED_TYPE:
2490                 res = "TLDAP_UNDEFINED_TYPE";
2491                 break;
2492         case TLDAP_INAPPROPRIATE_MATCHING:
2493                 res = "TLDAP_INAPPROPRIATE_MATCHING";
2494                 break;
2495         case TLDAP_CONSTRAINT_VIOLATION:
2496                 res = "TLDAP_CONSTRAINT_VIOLATION";
2497                 break;
2498         case TLDAP_TYPE_OR_VALUE_EXISTS:
2499                 res = "TLDAP_TYPE_OR_VALUE_EXISTS";
2500                 break;
2501         case TLDAP_INVALID_SYNTAX:
2502                 res = "TLDAP_INVALID_SYNTAX";
2503                 break;
2504         case TLDAP_NO_SUCH_OBJECT:
2505                 res = "TLDAP_NO_SUCH_OBJECT";
2506                 break;
2507         case TLDAP_ALIAS_PROBLEM:
2508                 res = "TLDAP_ALIAS_PROBLEM";
2509                 break;
2510         case TLDAP_INVALID_DN_SYNTAX:
2511                 res = "TLDAP_INVALID_DN_SYNTAX";
2512                 break;
2513         case TLDAP_IS_LEAF:
2514                 res = "TLDAP_IS_LEAF";
2515                 break;
2516         case TLDAP_ALIAS_DEREF_PROBLEM:
2517                 res = "TLDAP_ALIAS_DEREF_PROBLEM";
2518                 break;
2519         case TLDAP_INAPPROPRIATE_AUTH:
2520                 res = "TLDAP_INAPPROPRIATE_AUTH";
2521                 break;
2522         case TLDAP_INVALID_CREDENTIALS:
2523                 res = "TLDAP_INVALID_CREDENTIALS";
2524                 break;
2525         case TLDAP_INSUFFICIENT_ACCESS:
2526                 res = "TLDAP_INSUFFICIENT_ACCESS";
2527                 break;
2528         case TLDAP_BUSY:
2529                 res = "TLDAP_BUSY";
2530                 break;
2531         case TLDAP_UNAVAILABLE:
2532                 res = "TLDAP_UNAVAILABLE";
2533                 break;
2534         case TLDAP_UNWILLING_TO_PERFORM:
2535                 res = "TLDAP_UNWILLING_TO_PERFORM";
2536                 break;
2537         case TLDAP_LOOP_DETECT:
2538                 res = "TLDAP_LOOP_DETECT";
2539                 break;
2540         case TLDAP_NAMING_VIOLATION:
2541                 res = "TLDAP_NAMING_VIOLATION";
2542                 break;
2543         case TLDAP_OBJECT_CLASS_VIOLATION:
2544                 res = "TLDAP_OBJECT_CLASS_VIOLATION";
2545                 break;
2546         case TLDAP_NOT_ALLOWED_ON_NONLEAF:
2547                 res = "TLDAP_NOT_ALLOWED_ON_NONLEAF";
2548                 break;
2549         case TLDAP_NOT_ALLOWED_ON_RDN:
2550                 res = "TLDAP_NOT_ALLOWED_ON_RDN";
2551                 break;
2552         case TLDAP_ALREADY_EXISTS:
2553                 res = "TLDAP_ALREADY_EXISTS";
2554                 break;
2555         case TLDAP_NO_OBJECT_CLASS_MODS:
2556                 res = "TLDAP_NO_OBJECT_CLASS_MODS";
2557                 break;
2558         case TLDAP_RESULTS_TOO_LARGE:
2559                 res = "TLDAP_RESULTS_TOO_LARGE";
2560                 break;
2561         case TLDAP_AFFECTS_MULTIPLE_DSAS:
2562                 res = "TLDAP_AFFECTS_MULTIPLE_DSAS";
2563                 break;
2564         case TLDAP_OTHER:
2565                 res = "TLDAP_OTHER";
2566                 break;
2567         case TLDAP_SERVER_DOWN:
2568                 res = "TLDAP_SERVER_DOWN";
2569                 break;
2570         case TLDAP_LOCAL_ERROR:
2571                 res = "TLDAP_LOCAL_ERROR";
2572                 break;
2573         case TLDAP_ENCODING_ERROR:
2574                 res = "TLDAP_ENCODING_ERROR";
2575                 break;
2576         case TLDAP_DECODING_ERROR:
2577                 res = "TLDAP_DECODING_ERROR";
2578                 break;
2579         case TLDAP_TIMEOUT:
2580                 res = "TLDAP_TIMEOUT";
2581                 break;
2582         case TLDAP_AUTH_UNKNOWN:
2583                 res = "TLDAP_AUTH_UNKNOWN";
2584                 break;
2585         case TLDAP_FILTER_ERROR:
2586                 res = "TLDAP_FILTER_ERROR";
2587                 break;
2588         case TLDAP_USER_CANCELLED:
2589                 res = "TLDAP_USER_CANCELLED";
2590                 break;
2591         case TLDAP_PARAM_ERROR:
2592                 res = "TLDAP_PARAM_ERROR";
2593                 break;
2594         case TLDAP_NO_MEMORY:
2595                 res = "TLDAP_NO_MEMORY";
2596                 break;
2597         case TLDAP_CONNECT_ERROR:
2598                 res = "TLDAP_CONNECT_ERROR";
2599                 break;
2600         case TLDAP_NOT_SUPPORTED:
2601                 res = "TLDAP_NOT_SUPPORTED";
2602                 break;
2603         case TLDAP_CONTROL_NOT_FOUND:
2604                 res = "TLDAP_CONTROL_NOT_FOUND";
2605                 break;
2606         case TLDAP_NO_RESULTS_RETURNED:
2607                 res = "TLDAP_NO_RESULTS_RETURNED";
2608                 break;
2609         case TLDAP_MORE_RESULTS_TO_RETURN:
2610                 res = "TLDAP_MORE_RESULTS_TO_RETURN";
2611                 break;
2612         case TLDAP_CLIENT_LOOP:
2613                 res = "TLDAP_CLIENT_LOOP";
2614                 break;
2615         case TLDAP_REFERRAL_LIMIT_EXCEEDED:
2616                 res = "TLDAP_REFERRAL_LIMIT_EXCEEDED";
2617                 break;
2618         default:
2619                 res = talloc_asprintf(talloc_tos(), "Unknown LDAP Error (%d)",
2620                                       rc);
2621                 break;
2622         }
2623         if (res == NULL) {
2624                 res = "Unknown LDAP Error";
2625         }
2626         return res;
2627 }