source4/librpc/rpc/dcerpc_util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    dcerpc utility functions
   5
   6    Copyright (C) Andrew Tridgell 2003
   7    Copyright (C) Jelmer Vernooij 2004
   8    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   9    Copyright (C) Rafal Szczesniak 2006
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24 */
  25
  26 #include "includes.h"
  27 #include "lib/events/events.h"
  28 #include "libcli/composite/composite.h"
  29 #include "librpc/gen_ndr/ndr_epmapper.h"
  30 #include "librpc/gen_ndr/ndr_dcerpc.h"
  31 #include "librpc/gen_ndr/ndr_misc.h"
  32
  33 /*
  34   find a dcerpc call on an interface by name
  35 */
  36 const struct dcerpc_interface_call *dcerpc_iface_find_call(const struct dcerpc_interface_table *iface,
  37                                                            const char *name)
  38 {
  39         int i;
  40         for (i=0;i<iface->num_calls;i++) {
  41                 if (strcmp(iface->calls[i].name, name) == 0) {
  42                         return &iface->calls[i];
  43                 }
  44         }
  45         return NULL;
  46 }
  47
  48 /*
  49    push a ncacn_packet into a blob, potentially with auth info
  50 */
  51 NTSTATUS ncacn_push_auth(DATA_BLOB *blob, TALLOC_CTX *mem_ctx,
  52                           struct ncacn_packet *pkt,
  53                           struct dcerpc_auth *auth_info)
  54 {
  55         NTSTATUS status;
  56         struct ndr_push *ndr;
  57
  58         ndr = ndr_push_init_ctx(mem_ctx);
  59         if (!ndr) {
  60                 return NT_STATUS_NO_MEMORY;
  61         }
  62
  63         if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
  64                 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
  65         }
  66
  67         if (pkt->pfc_flags & DCERPC_PFC_FLAG_ORPC) {
  68                 ndr->flags |= LIBNDR_FLAG_OBJECT_PRESENT;
  69         }
  70
  71         if (auth_info) {
  72                 pkt->auth_length = auth_info->credentials.length;
  73         } else {
  74                 pkt->auth_length = 0;
  75         }
  76
  77         status = ndr_push_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
  78         if (!NT_STATUS_IS_OK(status)) {
  79                 return status;
  80         }
  81
  82         if (auth_info) {
  83                 status = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, auth_info);
  84         }
  85
  86         *blob = ndr_push_blob(ndr);
  87
  88         /* fill in the frag length */
  89         dcerpc_set_frag_length(blob, blob->length);
  90
  91         return NT_STATUS_OK;
  92 }
  93
  94 #define MAX_PROTSEQ             10
  95
  96 static const struct {
  97         const char *name;
  98         enum dcerpc_transport_t transport;
  99         int num_protocols;
 100         enum epm_protocol protseq[MAX_PROTSEQ];
 101 } transports[] = {
 102         { "ncacn_np",     NCACN_NP, 3,
 103                 { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_SMB, EPM_PROTOCOL_NETBIOS }},
 104         { "ncacn_ip_tcp", NCACN_IP_TCP, 3,
 105                 { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_TCP, EPM_PROTOCOL_IP } },
 106         { "ncacn_http", NCACN_HTTP, 3,
 107                 { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_HTTP, EPM_PROTOCOL_IP } },
 108         { "ncadg_ip_udp", NCACN_IP_UDP, 3,
 109                 { EPM_PROTOCOL_NCADG, EPM_PROTOCOL_UDP, EPM_PROTOCOL_IP } },
 110         { "ncalrpc", NCALRPC, 2,
 111                 { EPM_PROTOCOL_NCALRPC, EPM_PROTOCOL_PIPE } },
 112         { "ncacn_unix_stream", NCACN_UNIX_STREAM, 2,
 113                 { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_UNIX_DS } },
 114         { "ncadg_unix_dgram", NCADG_UNIX_DGRAM, 2,
 115                 { EPM_PROTOCOL_NCADG, EPM_PROTOCOL_UNIX_DS } },
 116         { "ncacn_at_dsp", NCACN_AT_DSP, 3,
 117                 { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_APPLETALK, EPM_PROTOCOL_DSP } },
 118         { "ncadg_at_ddp", NCADG_AT_DDP, 3,
 119                 { EPM_PROTOCOL_NCADG, EPM_PROTOCOL_APPLETALK, EPM_PROTOCOL_DDP } },
 120         { "ncacn_vns_ssp", NCACN_VNS_SPP, 3,
 121                 { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_STREETTALK, EPM_PROTOCOL_VINES_SPP } },
 122         { "ncacn_vns_ipc", NCACN_VNS_IPC, 3,
 123                 { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_STREETTALK, EPM_PROTOCOL_VINES_IPC }, },
 124         { "ncadg_ipx", NCADG_IPX, 2,
 125                 { EPM_PROTOCOL_NCADG, EPM_PROTOCOL_IPX },
 126         },
 127         { "ncacn_spx", NCACN_SPX, 3,
 128                 /* I guess some MS programmer confused the identifier for
 129                  * EPM_PROTOCOL_UUID (0x0D or 13) with the one for
 130                  * EPM_PROTOCOL_SPX (0x13) here. -- jelmer*/
 131                 { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_NCALRPC, EPM_PROTOCOL_UUID },
 132         },
 133 };
 134
 135 static const struct {
 136         const char *name;
 137         uint32_t flag;
 138 } ncacn_options[] = {
 139         {"sign", DCERPC_SIGN},
 140         {"seal", DCERPC_SEAL},
 141         {"connect", DCERPC_CONNECT},
 142         {"spnego", DCERPC_AUTH_SPNEGO},
 143         {"krb5", DCERPC_AUTH_KRB5},
 144         {"validate", DCERPC_DEBUG_VALIDATE_BOTH},
 145         {"print", DCERPC_DEBUG_PRINT_BOTH},
 146         {"padcheck", DCERPC_DEBUG_PAD_CHECK},
 147         {"bigendian", DCERPC_PUSH_BIGENDIAN},
 148         {"smb2", DCERPC_SMB2}
 149 };
 150
 151 const char *epm_floor_string(TALLOC_CTX *mem_ctx, struct epm_floor *epm_floor)
 152 {
 153         struct GUID uuid;
 154         uint16_t if_version;
 155         NTSTATUS status;
 156
 157         switch(epm_floor->lhs.protocol) {
 158                 case EPM_PROTOCOL_UUID:
 159                         status = dcerpc_floor_get_lhs_data(epm_floor, &uuid, &if_version);
 160                         if (NT_STATUS_IS_OK(status)) {
 161                                 /* lhs is used: UUID */
 162                                 char *uuidstr;
 163
 164                                 if (GUID_equal(&uuid, &ndr_transfer_syntax.uuid)) {
 165                                         return "NDR";
 166                                 }
 167
 168                                 if (GUID_equal(&uuid, &ndr64_transfer_syntax.uuid)) {
 169                                         return "NDR64";
 170                                 }
 171
 172                                 uuidstr = GUID_string(mem_ctx, &uuid);
 173
 174                                 return talloc_asprintf(mem_ctx, " uuid %s/0x%02x", uuidstr, if_version);
 175                         } else { /* IPX */
 176                                 return talloc_asprintf(mem_ctx, "IPX:%s",
 177                                                 data_blob_hex_string(mem_ctx, &epm_floor->rhs.uuid.unknown));
 178                         }
 179
 180                 case EPM_PROTOCOL_NCACN:
 181                         return "RPC-C";
 182
 183                 case EPM_PROTOCOL_NCADG:
 184                         return "RPC";
 185
 186                 case EPM_PROTOCOL_NCALRPC:
 187                         return "NCALRPC";
 188
 189                 case EPM_PROTOCOL_DNET_NSP:
 190                         return "DNET/NSP";
 191
 192                 case EPM_PROTOCOL_IP:
 193                         return talloc_asprintf(mem_ctx, "IP:%s", epm_floor->rhs.ip.ipaddr);
 194
 195                 case EPM_PROTOCOL_PIPE:
 196                         return talloc_asprintf(mem_ctx, "PIPE:%s", epm_floor->rhs.pipe.path);
 197
 198                 case EPM_PROTOCOL_SMB:
 199                         return talloc_asprintf(mem_ctx, "SMB:%s", epm_floor->rhs.smb.unc);
 200
 201                 case EPM_PROTOCOL_UNIX_DS:
 202                         return talloc_asprintf(mem_ctx, "Unix:%s", epm_floor->rhs.unix_ds.path);
 203
 204                 case EPM_PROTOCOL_NETBIOS:
 205                         return talloc_asprintf(mem_ctx, "NetBIOS:%s", epm_floor->rhs.netbios.name);
 206
 207                 case EPM_PROTOCOL_NETBEUI:
 208                         return "NETBeui";
 209
 210                 case EPM_PROTOCOL_SPX:
 211                         return "SPX";
 212
 213                 case EPM_PROTOCOL_NB_IPX:
 214                         return "NB_IPX";
 215
 216                 case EPM_PROTOCOL_HTTP:
 217                         return talloc_asprintf(mem_ctx, "HTTP:%d", epm_floor->rhs.http.port);
 218
 219                 case EPM_PROTOCOL_TCP:
 220                         return talloc_asprintf(mem_ctx, "TCP:%d", epm_floor->rhs.tcp.port);
 221
 222                 case EPM_PROTOCOL_UDP:
 223                         return talloc_asprintf(mem_ctx, "UDP:%d", epm_floor->rhs.udp.port);
 224
 225                 default:
 226                         return talloc_asprintf(mem_ctx, "UNK(%02x):", epm_floor->lhs.protocol);
 227         }
 228 }
 229
 230
 231 /*
 232   form a binding string from a binding structure
 233 */
 234 const char *dcerpc_binding_string(TALLOC_CTX *mem_ctx, const struct dcerpc_binding *b)
 235 {
 236         char *s = talloc_strdup(mem_ctx, "");
 237         int i;
 238         const char *t_name=NULL;
 239
 240         for (i=0;i<ARRAY_SIZE(transports);i++) {
 241                 if (transports[i].transport == b->transport) {
 242                         t_name = transports[i].name;
 243                 }
 244         }
 245         if (!t_name) {
 246                 return NULL;
 247         }
 248
 249         if (!GUID_all_zero(&b->object)) {
 250                 s = talloc_asprintf(s, "%s@",
 251                                     GUID_string(mem_ctx, &b->object));
 252         }
 253
 254         s = talloc_asprintf_append(s, "%s:", t_name);
 255         if (!s) return NULL;
 256
 257         if (b->host) {
 258                 s = talloc_asprintf_append(s, "%s", b->host);
 259         }
 260
 261         if (!b->endpoint && !b->options && !b->flags) {
 262                 return s;
 263         }
 264
 265         s = talloc_asprintf_append(s, "[");
 266
 267         if (b->endpoint) {
 268                 s = talloc_asprintf_append(s, "%s", b->endpoint);
 269         }
 270
 271         /* this is a *really* inefficent way of dealing with strings,
 272            but this is rarely called and the strings are always short,
 273            so I don't care */
 274         for (i=0;b->options && b->options[i];i++) {
 275                 s = talloc_asprintf_append(s, ",%s", b->options[i]);
 276                 if (!s) return NULL;
 277         }
 278
 279         for (i=0;i<ARRAY_SIZE(ncacn_options);i++) {
 280                 if (b->flags & ncacn_options[i].flag) {
 281                         s = talloc_asprintf_append(s, ",%s", ncacn_options[i].name);
 282                         if (!s) return NULL;
 283                 }
 284         }
 285
 286         s = talloc_asprintf_append(s, "]");
 287
 288         return s;
 289 }
 290
 291 /*
 292   parse a binding string into a dcerpc_binding structure
 293 */
 294 NTSTATUS dcerpc_parse_binding(TALLOC_CTX *mem_ctx, const char *s, struct dcerpc_binding **b_out)
 295 {
 296         struct dcerpc_binding *b;
 297         char *options, *type;
 298         char *p;
 299         int i, j, comma_count;
 300
 301         b = talloc(mem_ctx, struct dcerpc_binding);
 302         if (!b) {
 303                 return NT_STATUS_NO_MEMORY;
 304         }
 305
 306         p = strchr(s, '@');
 307
 308         if (p && PTR_DIFF(p, s) == 36) { /* 36 is the length of a UUID */
 309                 NTSTATUS status;
 310
 311                 status = GUID_from_string(s, &b->object);
 312
 313                 if (NT_STATUS_IS_ERR(status)) {
 314                         DEBUG(0, ("Failed parsing UUID\n"));
 315                         return status;
 316                 }
 317
 318                 s = p + 1;
 319         } else {
 320                 ZERO_STRUCT(b->object);
 321         }
 322
 323         b->object_version = 0;
 324
 325         p = strchr(s, ':');
 326         if (!p) {
 327                 return NT_STATUS_INVALID_PARAMETER;
 328         }
 329
 330         type = talloc_strndup(mem_ctx, s, PTR_DIFF(p, s));
 331         if (!type) {
 332                 return NT_STATUS_NO_MEMORY;
 333         }
 334
 335         for (i=0;i<ARRAY_SIZE(transports);i++) {
 336                 if (strcasecmp(type, transports[i].name) == 0) {
 337                         b->transport = transports[i].transport;
 338                         break;
 339                 }
 340         }
 341         if (i==ARRAY_SIZE(transports)) {
 342                 DEBUG(0,("Unknown dcerpc transport '%s'\n", type));
 343                 return NT_STATUS_INVALID_PARAMETER;
 344         }
 345
 346         s = p+1;
 347
 348         p = strchr(s, '[');
 349         if (p) {
 350                 b->host = talloc_strndup(b, s, PTR_DIFF(p, s));
 351                 options = talloc_strdup(mem_ctx, p+1);
 352                 if (options[strlen(options)-1] != ']') {
 353                         return NT_STATUS_INVALID_PARAMETER;
 354                 }
 355                 options[strlen(options)-1] = 0;
 356         } else {
 357                 b->host = talloc_strdup(b, s);
 358                 options = NULL;
 359         }
 360
 361         if (!b->host) {
 362                 return NT_STATUS_NO_MEMORY;
 363         }
 364
 365         b->options = NULL;
 366         b->flags = 0;
 367         b->endpoint = NULL;
 368
 369         if (!options) {
 370                 *b_out = b;
 371                 return NT_STATUS_OK;
 372         }
 373
 374         comma_count = count_chars(options, ',');
 375
 376         b->options = talloc_array(b, const char *, comma_count+2);
 377         if (!b->options) {
 378                 return NT_STATUS_NO_MEMORY;
 379         }
 380
 381         for (i=0; (p = strchr(options, ',')); i++) {
 382                 b->options[i] = talloc_strndup(b, options, PTR_DIFF(p, options));
 383                 if (!b->options[i]) {
 384                         return NT_STATUS_NO_MEMORY;
 385                 }
 386                 options = p+1;
 387         }
 388         b->options[i] = options;
 389         b->options[i+1] = NULL;
 390
 391         /* some options are pre-parsed for convenience */
 392         for (i=0;b->options[i];i++) {
 393                 for (j=0;j<ARRAY_SIZE(ncacn_options);j++) {
 394                         if (strcasecmp(ncacn_options[j].name, b->options[i]) == 0) {
 395                                 int k;
 396                                 b->flags |= ncacn_options[j].flag;
 397                                 for (k=i;b->options[k];k++) {
 398                                         b->options[k] = b->options[k+1];
 399                                 }
 400                                 i--;
 401                                 break;
 402                         }
 403                 }
 404         }
 405
 406         if (b->options[0]) {
 407                 /* Endpoint is first option */
 408                 b->endpoint = b->options[0];
 409                 if (strlen(b->endpoint) == 0) b->endpoint = NULL;
 410
 411                 for (i=0;b->options[i];i++) {
 412                         b->options[i] = b->options[i+1];
 413                 }
 414         }
 415
 416         if (b->options[0] == NULL)
 417                 b->options = NULL;
 418
 419         *b_out = b;
 420         return NT_STATUS_OK;
 421 }
 422
 423 NTSTATUS dcerpc_floor_get_lhs_data(struct epm_floor *epm_floor, struct GUID *uuid, uint16_t *if_version)
 424 {
 425         TALLOC_CTX *mem_ctx = talloc_init("floor_get_lhs_data");
 426         struct ndr_pull *ndr = ndr_pull_init_blob(&epm_floor->lhs.lhs_data, mem_ctx);
 427         NTSTATUS status;
 428
 429         ndr->flags |= LIBNDR_FLAG_NOALIGN;
 430
 431         status = ndr_pull_GUID(ndr, NDR_SCALARS | NDR_BUFFERS, uuid);
 432         if (NT_STATUS_IS_ERR(status)) {
 433                 talloc_free(mem_ctx);
 434                 return status;
 435         }
 436
 437         status = ndr_pull_uint16(ndr, NDR_SCALARS, if_version);
 438
 439         talloc_free(mem_ctx);
 440
 441         return status;
 442 }
 443
 444 static DATA_BLOB dcerpc_floor_pack_lhs_data(TALLOC_CTX *mem_ctx, const struct GUID *uuid, uint32_t if_version)
 445 {
 446         struct ndr_push *ndr = ndr_push_init_ctx(mem_ctx);
 447
 448         ndr->flags |= LIBNDR_FLAG_NOALIGN;
 449
 450         ndr_push_GUID(ndr, NDR_SCALARS | NDR_BUFFERS, uuid);
 451         ndr_push_uint16(ndr, NDR_SCALARS, if_version);
 452
 453         return ndr_push_blob(ndr);
 454 }
 455
 456 const char *dcerpc_floor_get_rhs_data(TALLOC_CTX *mem_ctx, struct epm_floor *epm_floor)
 457 {
 458         switch (epm_floor->lhs.protocol) {
 459         case EPM_PROTOCOL_TCP:
 460                 if (epm_floor->rhs.tcp.port == 0) return NULL;
 461                 return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.tcp.port);
 462
 463         case EPM_PROTOCOL_UDP:
 464                 if (epm_floor->rhs.udp.port == 0) return NULL;
 465                 return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.udp.port);
 466
 467         case EPM_PROTOCOL_HTTP:
 468                 if (epm_floor->rhs.http.port == 0) return NULL;
 469                 return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.http.port);
 470
 471         case EPM_PROTOCOL_IP:
 472                 return talloc_strdup(mem_ctx, epm_floor->rhs.ip.ipaddr);
 473
 474         case EPM_PROTOCOL_NCACN:
 475                 return NULL;
 476
 477         case EPM_PROTOCOL_NCADG:
 478                 return NULL;
 479
 480         case EPM_PROTOCOL_SMB:
 481                 if (strlen(epm_floor->rhs.smb.unc) == 0) return NULL;
 482                 return talloc_strdup(mem_ctx, epm_floor->rhs.smb.unc);
 483
 484         case EPM_PROTOCOL_PIPE:
 485                 if (strlen(epm_floor->rhs.pipe.path) == 0) return NULL;
 486                 return talloc_strdup(mem_ctx, epm_floor->rhs.pipe.path);
 487
 488         case EPM_PROTOCOL_NETBIOS:
 489                 if (strlen(epm_floor->rhs.netbios.name) == 0) return NULL;
 490                 return talloc_strdup(mem_ctx, epm_floor->rhs.netbios.name);
 491
 492         case EPM_PROTOCOL_NCALRPC:
 493                 return NULL;
 494
 495         case EPM_PROTOCOL_VINES_SPP:
 496                 return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.vines_spp.port);
 497
 498         case EPM_PROTOCOL_VINES_IPC:
 499                 return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.vines_ipc.port);
 500
 501         case EPM_PROTOCOL_STREETTALK:
 502                 return talloc_strdup(mem_ctx, epm_floor->rhs.streettalk.streettalk);
 503
 504         case EPM_PROTOCOL_UNIX_DS:
 505                 if (strlen(epm_floor->rhs.unix_ds.path) == 0) return NULL;
 506                 return talloc_strdup(mem_ctx, epm_floor->rhs.unix_ds.path);
 507
 508         case EPM_PROTOCOL_NULL:
 509                 return NULL;
 510
 511         default:
 512                 DEBUG(0,("Unsupported lhs protocol %d\n", epm_floor->lhs.protocol));
 513                 break;
 514         }
 515
 516         return NULL;
 517 }
 518
 519 static NTSTATUS dcerpc_floor_set_rhs_data(TALLOC_CTX *mem_ctx, struct epm_floor *epm_floor,  const char *data)
 520 {
 521         switch (epm_floor->lhs.protocol) {
 522         case EPM_PROTOCOL_TCP:
 523                 epm_floor->rhs.tcp.port = atoi(data);
 524                 return NT_STATUS_OK;
 525
 526         case EPM_PROTOCOL_UDP:
 527                 epm_floor->rhs.udp.port = atoi(data);
 528                 return NT_STATUS_OK;
 529
 530         case EPM_PROTOCOL_HTTP:
 531                 epm_floor->rhs.http.port = atoi(data);
 532                 return NT_STATUS_OK;
 533
 534         case EPM_PROTOCOL_IP:
 535                 epm_floor->rhs.ip.ipaddr = talloc_strdup(mem_ctx, data);
 536                 NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.ip.ipaddr);
 537                 return NT_STATUS_OK;
 538
 539         case EPM_PROTOCOL_NCACN:
 540                 epm_floor->rhs.ncacn.minor_version = 0;
 541                 return NT_STATUS_OK;
 542
 543         case EPM_PROTOCOL_NCADG:
 544                 epm_floor->rhs.ncadg.minor_version = 0;
 545                 return NT_STATUS_OK;
 546
 547         case EPM_PROTOCOL_SMB:
 548                 epm_floor->rhs.smb.unc = talloc_strdup(mem_ctx, data);
 549                 NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.smb.unc);
 550                 return NT_STATUS_OK;
 551
 552         case EPM_PROTOCOL_PIPE:
 553                 epm_floor->rhs.pipe.path = talloc_strdup(mem_ctx, data);
 554                 NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.pipe.path);
 555                 return NT_STATUS_OK;
 556
 557         case EPM_PROTOCOL_NETBIOS:
 558                 epm_floor->rhs.netbios.name = talloc_strdup(mem_ctx, data);
 559                 NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.netbios.name);
 560                 return NT_STATUS_OK;
 561
 562         case EPM_PROTOCOL_NCALRPC:
 563                 return NT_STATUS_OK;
 564
 565         case EPM_PROTOCOL_VINES_SPP:
 566                 epm_floor->rhs.vines_spp.port = atoi(data);
 567                 return NT_STATUS_OK;
 568
 569         case EPM_PROTOCOL_VINES_IPC:
 570                 epm_floor->rhs.vines_ipc.port = atoi(data);
 571                 return NT_STATUS_OK;
 572
 573         case EPM_PROTOCOL_STREETTALK:
 574                 epm_floor->rhs.streettalk.streettalk = talloc_strdup(mem_ctx, data);
 575                 NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.streettalk.streettalk);
 576                 return NT_STATUS_OK;
 577
 578         case EPM_PROTOCOL_UNIX_DS:
 579                 epm_floor->rhs.unix_ds.path = talloc_strdup(mem_ctx, data);
 580                 NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.unix_ds.path);
 581                 return NT_STATUS_OK;
 582
 583         case EPM_PROTOCOL_NULL:
 584                 return NT_STATUS_OK;
 585
 586         default:
 587                 DEBUG(0,("Unsupported lhs protocol %d\n", epm_floor->lhs.protocol));
 588                 break;
 589         }
 590
 591         return NT_STATUS_NOT_SUPPORTED;
 592 }
 593
 594 enum dcerpc_transport_t dcerpc_transport_by_endpoint_protocol(int prot)
 595 {
 596         int i;
 597
 598         /* Find a transport that has 'prot' as 4th protocol */
 599         for (i=0;i<ARRAY_SIZE(transports);i++) {
 600                 if (transports[i].num_protocols >= 2 &&
 601                         transports[i].protseq[1] == prot) {
 602                         return transports[i].transport;
 603                 }
 604         }
 605
 606         /* Unknown transport */
 607         return -1;
 608 }
 609
 610 enum dcerpc_transport_t dcerpc_transport_by_tower(struct epm_tower *tower)
 611 {
 612         int i;
 613
 614         /* Find a transport that matches this tower */
 615         for (i=0;i<ARRAY_SIZE(transports);i++) {
 616                 int j;
 617                 if (transports[i].num_protocols != tower->num_floors - 2) {
 618                         continue;
 619                 }
 620
 621                 for (j = 0; j < transports[i].num_protocols; j++) {
 622                         if (transports[i].protseq[j] != tower->floors[j+2].lhs.protocol) {
 623                                 break;
 624                         }
 625                 }
 626
 627                 if (j == transports[i].num_protocols) {
 628                         return transports[i].transport;
 629                 }
 630         }
 631
 632         /* Unknown transport */
 633         return -1;
 634 }
 635
 636 NTSTATUS dcerpc_binding_from_tower(TALLOC_CTX *mem_ctx, struct epm_tower *tower, struct dcerpc_binding **b_out)
 637 {
 638         NTSTATUS status;
 639         struct dcerpc_binding *binding;
 640
 641         binding = talloc(mem_ctx, struct dcerpc_binding);
 642         NT_STATUS_HAVE_NO_MEMORY(binding);
 643
 644         ZERO_STRUCT(binding->object);
 645         binding->options = NULL;
 646         binding->host = NULL;
 647         binding->flags = 0;
 648
 649         binding->transport = dcerpc_transport_by_tower(tower);
 650
 651         if (binding->transport == -1) {
 652                 return NT_STATUS_NOT_SUPPORTED;
 653         }
 654
 655         if (tower->num_floors < 1) {
 656                 return NT_STATUS_OK;
 657         }
 658
 659         /* Set object uuid */
 660         status = dcerpc_floor_get_lhs_data(&tower->floors[0], &binding->object, &binding->object_version);
 661
 662         if (!NT_STATUS_IS_OK(status)) {
 663                 DEBUG(1, ("Error pulling object uuid and version: %s", nt_errstr(status)));
 664                 return status;
 665         }
 666
 667         /* Ignore floor 1, it contains the NDR version info */
 668
 669         binding->options = NULL;
 670
 671         /* Set endpoint */
 672         if (tower->num_floors >= 4) {
 673                 binding->endpoint = dcerpc_floor_get_rhs_data(mem_ctx, &tower->floors[3]);
 674         } else {
 675                 binding->endpoint = NULL;
 676         }
 677
 678         /* Set network address */
 679         if (tower->num_floors >= 5) {
 680                 binding->host = dcerpc_floor_get_rhs_data(mem_ctx, &tower->floors[4]);
 681         }
 682         *b_out = binding;
 683         return NT_STATUS_OK;
 684 }
 685
 686 NTSTATUS dcerpc_binding_build_tower(TALLOC_CTX *mem_ctx, struct dcerpc_binding *binding, struct epm_tower *tower)
 687 {
 688         const enum epm_protocol *protseq = NULL;
 689         int num_protocols = -1, i;
 690         NTSTATUS status;
 691
 692         /* Find transport */
 693         for (i=0;i<ARRAY_SIZE(transports);i++) {
 694                 if (transports[i].transport == binding->transport) {
 695                         protseq = transports[i].protseq;
 696                         num_protocols = transports[i].num_protocols;
 697                         break;
 698                 }
 699         }
 700
 701         if (num_protocols == -1) {
 702                 DEBUG(0, ("Unable to find transport with id '%d'\n", binding->transport));
 703                 return NT_STATUS_UNSUCCESSFUL;
 704         }
 705
 706         tower->num_floors = 2 + num_protocols;
 707         tower->floors = talloc_array(mem_ctx, struct epm_floor, tower->num_floors);
 708
 709         /* Floor 0 */
 710         tower->floors[0].lhs.protocol = EPM_PROTOCOL_UUID;
 711
 712         tower->floors[0].lhs.lhs_data = dcerpc_floor_pack_lhs_data(mem_ctx, &binding->object, binding->object_version);
 713
 714         tower->floors[0].rhs.uuid.unknown = data_blob_talloc_zero(mem_ctx, 2);
 715
 716         /* Floor 1 */
 717         tower->floors[1].lhs.protocol = EPM_PROTOCOL_UUID;
 718
 719         tower->floors[1].lhs.lhs_data = dcerpc_floor_pack_lhs_data(mem_ctx,
 720                                                                 &ndr_transfer_syntax.uuid,
 721                                                                 ndr_transfer_syntax.if_version);
 722
 723         tower->floors[1].rhs.uuid.unknown = data_blob_talloc_zero(mem_ctx, 2);
 724
 725         /* Floor 2 to num_protocols */
 726         for (i = 0; i < num_protocols; i++) {
 727                 tower->floors[2 + i].lhs.protocol = protseq[i];
 728                 tower->floors[2 + i].lhs.lhs_data = data_blob_talloc(mem_ctx, NULL, 0);
 729                 ZERO_STRUCT(tower->floors[2 + i].rhs);
 730                 dcerpc_floor_set_rhs_data(mem_ctx, &tower->floors[2 + i], "");
 731         }
 732
 733         /* The 4th floor contains the endpoint */
 734         if (num_protocols >= 2 && binding->endpoint) {
 735                 status = dcerpc_floor_set_rhs_data(mem_ctx, &tower->floors[3], binding->endpoint);
 736                 if (NT_STATUS_IS_ERR(status)) {
 737                         return status;
 738                 }
 739         }
 740
 741         /* The 5th contains the network address */
 742         if (num_protocols >= 3 && binding->host) {
 743                 if (is_ipaddress(binding->host)) {
 744                         status = dcerpc_floor_set_rhs_data(mem_ctx, &tower->floors[4],
 745                                                            binding->host);
 746                 } else {
 747                         /* note that we don't attempt to resolve the
 748                            name here - when we get a hostname here we
 749                            are in the client code, and want to put in
 750                            a wildcard all-zeros IP for the server to
 751                            fill in */
 752                         status = dcerpc_floor_set_rhs_data(mem_ctx, &tower->floors[4],
 753                                                            "0.0.0.0");
 754                 }
 755                 if (NT_STATUS_IS_ERR(status)) {
 756                         return status;
 757                 }
 758         }
 759
 760         return NT_STATUS_OK;
 761 }
 762
 763
 764 struct epm_map_binding_state {
 765         struct dcerpc_binding *binding;
 766         const struct dcerpc_interface_table *table;
 767         struct dcerpc_pipe *pipe;
 768         struct policy_handle handle;
 769         struct GUID guid;
 770         struct epm_twr_t twr;
 771         struct epm_twr_t *twr_r;
 772         struct epm_Map r;
 773 };
 774
 775
 776 static void continue_epm_recv_binding(struct composite_context *ctx);
 777 static void continue_epm_map(struct rpc_request *req);
 778
 779
 780 static void continue_epm_recv_binding(struct composite_context *ctx)
 781 {
 782         struct rpc_request *map_req;
 783
 784         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 785                                                       struct composite_context);
 786         struct epm_map_binding_state *s = talloc_get_type(c->private_data,
 787                                                           struct epm_map_binding_state);
 788
 789         c->status = dcerpc_pipe_connect_b_recv(ctx, c, &s->pipe);
 790         if (!composite_is_ok(c)) return;
 791
 792         ZERO_STRUCT(s->handle);
 793         ZERO_STRUCT(s->guid);
 794
 795         s->binding->object         = s->table->uuid;
 796         s->binding->object_version = s->table->if_version;
 797
 798         c->status = dcerpc_binding_build_tower(s->pipe, s->binding, &s->twr.tower);
 799         if (!composite_is_ok(c)) return;
 800
 801         /* with some nice pretty paper around it of course */
 802         s->r.in.object        = &s->guid;
 803         s->r.in.map_tower     = &s->twr;
 804         s->r.in.entry_handle  = &s->handle;
 805         s->r.in.max_towers    = 1;
 806         s->r.out.entry_handle = &s->handle;
 807
 808         map_req = dcerpc_epm_Map_send(s->pipe, c, &s->r);
 809         if (composite_nomem(map_req, c)) return;
 810
 811         composite_continue_rpc(c, map_req, continue_epm_map, c);
 812 }
 813
 814
 815 static void continue_epm_map(struct rpc_request *req)
 816 {
 817         struct composite_context *c = talloc_get_type(req->async.private,
 818                                                       struct composite_context);
 819         struct epm_map_binding_state *s = talloc_get_type(c->private_data,
 820                                                           struct epm_map_binding_state);
 821
 822         c->status = dcerpc_ndr_request_recv(req);
 823         if (!composite_is_ok(c)) return;
 824
 825         if (s->r.out.result != 0 || s->r.out.num_towers != 1) {
 826                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 827                 return;
 828         }
 829
 830         s->twr_r = s->r.out.towers[0].twr;
 831         if (s->twr_r == NULL) {
 832                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 833                 return;
 834         }
 835
 836         if (s->twr_r->tower.num_floors != s->twr.tower.num_floors ||
 837             s->twr_r->tower.floors[3].lhs.protocol != s->twr.tower.floors[3].lhs.protocol) {
 838                 composite_error(c, NT_STATUS_PORT_UNREACHABLE);
 839                 return;
 840         }
 841
 842         s->binding->endpoint = talloc_reference(s->binding,
 843                                                 dcerpc_floor_get_rhs_data(c, &s->twr_r->tower.floors[3]));
 844         composite_done(c);
 845 }
 846
 847
 848 struct composite_context *dcerpc_epm_map_binding_send(TALLOC_CTX *mem_ctx,
 849                                                       struct dcerpc_binding *binding,
 850                                                       const struct dcerpc_interface_table *table,
 851                                                       struct event_context *ev)
 852 {
 853         struct composite_context *c;
 854         struct epm_map_binding_state *s;
 855         struct composite_context *pipe_connect_req;
 856         struct cli_credentials *anon_creds;
 857
 858         NTSTATUS status;
 859         struct dcerpc_binding *epmapper_binding;
 860         int i;
 861
 862         /* composite context allocation and setup */
 863         c = talloc_zero(mem_ctx, struct composite_context);
 864         if (c == NULL) return NULL;
 865
 866         s = talloc_zero(c, struct epm_map_binding_state);
 867         if (composite_nomem(s, c)) return c;
 868
 869         c->state = COMPOSITE_STATE_IN_PROGRESS;
 870         c->private_data = s;
 871         c->event_ctx = ev;
 872
 873         /* Try to find event context in memory context in case passed
 874          * event_context (argument) was NULL. If there's none, just
 875          * create a new one.
 876          */
 877         if (c->event_ctx == NULL) {
 878                 c->event_ctx = event_context_find(mem_ctx);
 879         }
 880
 881         s->binding = binding;
 882         s->table   = table;
 883
 884         anon_creds = cli_credentials_init(mem_ctx);
 885         cli_credentials_set_conf(anon_creds);
 886         cli_credentials_set_anonymous(anon_creds);
 887
 888         /* First, check if there is a default endpoint specified in the IDL */
 889
 890         if (table) {
 891                 struct dcerpc_binding *default_binding;
 892
 893                 /* Find one of the default pipes for this interface */
 894                 for (i = 0; i < table->endpoints->count; i++) {
 895                         status = dcerpc_parse_binding(mem_ctx, table->endpoints->names[i], &default_binding);
 896
 897                         if (NT_STATUS_IS_OK(status)) {
 898                                 if (default_binding->transport == binding->transport && default_binding->endpoint) {
 899                                         binding->endpoint = talloc_reference(binding, default_binding->endpoint);
 900                                         talloc_free(default_binding);
 901
 902                                         composite_done(c);
 903                                         return c;
 904
 905                                 } else {
 906                                         talloc_free(default_binding);
 907                                 }
 908                         }
 909                 }
 910         }
 911
 912         epmapper_binding = talloc_zero(c, struct dcerpc_binding);
 913         if (composite_nomem(epmapper_binding, c)) return c;
 914
 915         epmapper_binding->transport  = binding->transport;
 916         epmapper_binding->host       = talloc_reference(epmapper_binding, binding->host);
 917         epmapper_binding->options    = NULL;
 918         epmapper_binding->flags      = 0;
 919         epmapper_binding->endpoint   = NULL;
 920
 921         pipe_connect_req = dcerpc_pipe_connect_b_send(c, &s->pipe, epmapper_binding, &dcerpc_table_epmapper,
 922                                                       anon_creds, c->event_ctx);
 923         if (composite_nomem(pipe_connect_req, c)) return c;
 924
 925         composite_continue(c, pipe_connect_req, continue_epm_recv_binding, c);
 926         return c;
 927 }
 928
 929
 930 NTSTATUS dcerpc_epm_map_binding_recv(struct composite_context *c)
 931 {
 932         NTSTATUS status = composite_wait(c);
 933
 934         talloc_free(c);
 935         return status;
 936 }
 937
 938
 939 NTSTATUS dcerpc_epm_map_binding(TALLOC_CTX *mem_ctx, struct dcerpc_binding *binding,
 940                                 const struct dcerpc_interface_table *table, struct event_context *ev)
 941 {
 942         struct composite_context *c;
 943
 944         c = dcerpc_epm_map_binding_send(mem_ctx, binding, table, ev);
 945         return dcerpc_epm_map_binding_recv(c);
 946 }
 947
 948
 949 struct pipe_auth_state {
 950         struct dcerpc_pipe *pipe;
 951         struct dcerpc_binding *binding;
 952         const struct dcerpc_interface_table *table;
 953         struct cli_credentials *credentials;
 954 };
 955
 956
 957 static void continue_auth_schannel(struct composite_context *ctx);
 958 static void continue_auth(struct composite_context *ctx);
 959 static void continue_auth_none(struct composite_context *ctx);
 960
 961
 962 /*
 963   Stage 2 of pipe_auth: Receive result of schannel bind request
 964 */
 965 static void continue_auth_schannel(struct composite_context *ctx)
 966 {
 967         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 968                                                       struct composite_context);
 969
 970         c->status = dcerpc_bind_auth_schannel_recv(ctx);
 971         if (!composite_is_ok(c)) return;
 972
 973         composite_done(c);
 974 }
 975
 976
 977 /*
 978   Stage 2 of pipe_auth: Receive result of authenticated bind request
 979 */
 980 static void continue_auth(struct composite_context *ctx)
 981 {
 982         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 983                                                       struct composite_context);
 984
 985         c->status = dcerpc_bind_auth_recv(ctx);
 986         if (!composite_is_ok(c)) return;
 987
 988         composite_done(c);
 989 }
 990
 991
 992 /*
 993   Stage 2 of pipe_auth: Receive result of non-authenticated bind request
 994 */
 995 static void continue_auth_none(struct composite_context *ctx)
 996 {
 997         struct composite_context *c = talloc_get_type(ctx->async.private_data,
 998                                                       struct composite_context);
 999
1000         c->status = dcerpc_bind_auth_none_recv(ctx);
1001         if (!composite_is_ok(c)) return;
1002
1003         composite_done(c);
1004 }
1005
1006
1007 /*
1008   Request to perform an authenticated bind if required. Authentication
1009   is determined using credentials passed and binding flags.
1010 */
1011 struct composite_context *dcerpc_pipe_auth_send(struct dcerpc_pipe *p,
1012                                                 struct dcerpc_binding *binding,
1013                                                 const struct dcerpc_interface_table *table,
1014                                                 struct cli_credentials *credentials)
1015 {
1016         struct composite_context *c;
1017         struct pipe_auth_state *s;
1018         struct composite_context *auth_schannel_req;
1019         struct composite_context *auth_req;
1020         struct composite_context *auth_none_req;
1021
1022         /* composite context allocation and setup */
1023         c = talloc_zero(NULL, struct composite_context);
1024         if (c == NULL) return NULL;
1025
1026         s = talloc_zero(c, struct pipe_auth_state);
1027         if (composite_nomem(s, c)) return c;
1028
1029         c->state = COMPOSITE_STATE_IN_PROGRESS;
1030         c->private_data = s;
1031         c->event_ctx = p->conn->event_ctx;
1032
1033         /* store parameters in state structure */
1034         s->binding      = binding;
1035         s->table        = table;
1036         s->credentials  = credentials;
1037         s->pipe         = p;
1038
1039         s->pipe->conn->flags = binding->flags;
1040
1041         /* remember the binding string for possible secondary connections */
1042         s->pipe->conn->binding_string = dcerpc_binding_string(p, binding);
1043
1044         if (!cli_credentials_is_anonymous(s->credentials) &&
1045             (binding->flags & DCERPC_SCHANNEL) &&
1046             !cli_credentials_get_netlogon_creds(s->credentials)) {
1047
1048                 /* If we don't already have netlogon credentials for
1049                  * the schannel bind, then we have to get these
1050                  * first */
1051                 auth_schannel_req = dcerpc_bind_auth_schannel_send(c, s->pipe, s->table,
1052                                                                    s->credentials,
1053                                                                    dcerpc_auth_level(s->pipe->conn));
1054                 if (composite_nomem(auth_schannel_req, c)) return c;
1055
1056                 composite_continue(c, auth_schannel_req, continue_auth_schannel, c);
1057
1058         } else if (!cli_credentials_is_anonymous(s->credentials) &&
1059                    !(s->pipe->conn->transport.transport == NCACN_NP &&
1060                      !(s->binding->flags & DCERPC_SIGN) &&
1061                      !(s->binding->flags & DCERPC_SEAL))) {
1062
1063                 /* Perform an authenticated DCE-RPC bind, except where
1064                  * we ask for a connection on NCACN_NP, and that
1065                  * connection is not signed or sealed.  For that case
1066                  * we rely on the already authenticated CIFS connection
1067                  */
1068
1069                 uint8_t auth_type;
1070
1071                 if ((s->pipe->conn->flags & (DCERPC_SIGN|DCERPC_SEAL)) == 0) {
1072                         /*
1073                           we are doing an authenticated connection,
1074                           but not using sign or seal. We must force
1075                           the CONNECT dcerpc auth type as a NONE auth
1076                           type doesn't allow authentication
1077                           information to be passed.
1078                         */
1079                         s->pipe->conn->flags |= DCERPC_CONNECT;
1080                 }
1081
1082                 if (s->binding->flags & DCERPC_AUTH_SPNEGO) {
1083                         auth_type = DCERPC_AUTH_TYPE_SPNEGO;
1084
1085                 } else if (s->binding->flags & DCERPC_AUTH_KRB5) {
1086                         auth_type = DCERPC_AUTH_TYPE_KRB5;
1087
1088                 } else if (s->binding->flags & DCERPC_SCHANNEL) {
1089                         auth_type = DCERPC_AUTH_TYPE_SCHANNEL;
1090
1091                 } else {
1092                         auth_type = DCERPC_AUTH_TYPE_NTLMSSP;
1093                 }
1094
1095                 auth_req = dcerpc_bind_auth_send(c, s->pipe, s->table,
1096                                                  s->credentials, auth_type,
1097                                                  dcerpc_auth_level(s->pipe->conn),
1098                                                  s->table->authservices->names[0]);
1099                 if (composite_nomem(auth_req, c)) return c;
1100
1101                 composite_continue(c, auth_req, continue_auth, c);
1102
1103         } else {
1104                 auth_none_req = dcerpc_bind_auth_none_send(c, s->pipe, s->table);
1105                 if (composite_nomem(auth_none_req, c)) return c;
1106
1107                 composite_continue(c, auth_none_req, continue_auth_none, c);
1108         }
1109
1110         return c;
1111 }
1112
1113
1114 /*
1115   Receive result of authenticated bind request on dcerpc pipe
1116 */
1117 NTSTATUS dcerpc_pipe_auth_recv(struct composite_context *c)
1118 {
1119         NTSTATUS status;
1120
1121         struct pipe_auth_state *s = talloc_get_type(c->private_data,
1122                                                     struct pipe_auth_state);
1123         status = composite_wait(c);
1124         if (!NT_STATUS_IS_OK(status)) {
1125                 char *uuid_str = GUID_string(s->pipe, &s->table->uuid);
1126                 DEBUG(0, ("Failed to bind to uuid %s - %s\n", uuid_str, nt_errstr(status)));
1127                 talloc_free(uuid_str);
1128         }
1129
1130         talloc_free(c);
1131         return status;
1132 }
1133
1134
1135 /*
1136    Perform an authenticated bind if needed - sync version
1137 */
1138 NTSTATUS dcerpc_pipe_auth(struct dcerpc_pipe *p,
1139                           struct dcerpc_binding *binding,
1140                           const struct dcerpc_interface_table *table,
1141                           struct cli_credentials *credentials)
1142 {
1143         struct composite_context *c;
1144
1145         c = dcerpc_pipe_auth_send(p, binding, table, credentials);
1146         return dcerpc_pipe_auth_recv(c);
1147 }
1148
1149
1150 NTSTATUS dcerpc_generic_session_key(struct dcerpc_connection *c,
1151                                     DATA_BLOB *session_key)
1152 {
1153         /* this took quite a few CPU cycles to find ... */
1154         session_key->data = discard_const_p(unsigned char, "SystemLibraryDTC");
1155         session_key->length = 16;
1156         return NT_STATUS_OK;
1157 }
1158
1159 /*
1160   fetch the user session key - may be default (above) or the SMB session key
1161 */
1162 NTSTATUS dcerpc_fetch_session_key(struct dcerpc_pipe *p,
1163                                   DATA_BLOB *session_key)
1164 {
1165         return p->conn->security_state.session_key(p->conn, session_key);
1166 }
1167
1168
1169 /*
1170   log a rpc packet in a format suitable for ndrdump. This is especially useful
1171   for sealed packets, where ethereal cannot easily see the contents
1172
1173   this triggers on a debug level of >= 10
1174 */
1175 void dcerpc_log_packet(const struct dcerpc_interface_table *ndr,
1176                        uint32_t opnum, uint32_t flags, DATA_BLOB *pkt)
1177 {
1178         const int num_examples = 20;
1179         int i;
1180
1181         if (DEBUGLEVEL < 10) return;
1182
1183         for (i=0;i<num_examples;i++) {
1184                 char *name=NULL;
1185                 asprintf(&name, "%s/rpclog/%s-%u.%d.%s",
1186                          lp_lockdir(), ndr->name, opnum, i,
1187                          (flags&NDR_IN)?"in":"out");
1188                 if (name == NULL) {
1189                         return;
1190                 }
1191                 if (!file_exist(name)) {
1192                         if (file_save(name, pkt->data, pkt->length)) {
1193                                 DEBUG(10,("Logged rpc packet to %s\n", name));
1194                         }
1195                         free(name);
1196                         break;
1197                 }
1198                 free(name);
1199         }
1200 }
1201
1202
1203
1204 /*
1205   create a secondary context from a primary connection
1206
1207   this uses dcerpc_alter_context() to create a new dcerpc context_id
1208 */
1209 NTSTATUS dcerpc_secondary_context(struct dcerpc_pipe *p,
1210                                   struct dcerpc_pipe **pp2,
1211                                   const struct dcerpc_interface_table *table)
1212 {
1213         NTSTATUS status;
1214         struct dcerpc_pipe *p2;
1215
1216         p2 = talloc_zero(p, struct dcerpc_pipe);
1217         if (p2 == NULL) {
1218                 return NT_STATUS_NO_MEMORY;
1219         }
1220         p2->conn = talloc_reference(p2, p->conn);
1221         p2->request_timeout = p->request_timeout;
1222
1223         p2->context_id = ++p->conn->next_context_id;
1224
1225         p2->syntax.uuid = table->uuid;
1226         p2->syntax.if_version = table->if_version;
1227
1228         p2->transfer_syntax = ndr_transfer_syntax;
1229
1230         status = dcerpc_alter_context(p2, p2, &p2->syntax, &p2->transfer_syntax);
1231         if (!NT_STATUS_IS_OK(status)) {
1232                 talloc_free(p2);
1233                 return status;
1234         }
1235
1236         *pp2 = p2;
1237
1238         return status;
1239 }