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
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25 #include "system/network.h"
  26 #include "librpc/gen_ndr/ndr_epmapper.h"
  27
  28 /*
  29   find the pipe name for a local IDL interface
  30 */
  31 const char *idl_pipe_name(const char *uuid, uint32_t if_version)
  32 {
  33         const struct dcerpc_interface_list *l;
  34         for (l=librpc_dcerpc_pipes();l;l=l->next) {
  35                 if (strcasecmp(l->table->uuid, uuid) == 0 &&
  36                     l->table->if_version == if_version) {
  37                         return l->table->name;
  38                 }
  39         }
  40         return "UNKNOWN";
  41 }
  42
  43 /*
  44   find the number of calls defined by local IDL
  45 */
  46 int idl_num_calls(const char *uuid, uint32_t if_version)
  47 {
  48         const struct dcerpc_interface_list *l;
  49         for (l=librpc_dcerpc_pipes();l;l=l->next){
  50                 if (strcasecmp(l->table->uuid, uuid) == 0 &&
  51                     l->table->if_version == if_version) {
  52                         return l->table->num_calls;
  53                 }
  54         }
  55         return -1;
  56 }
  57
  58
  59 /*
  60   find a dcerpc interface by name
  61 */
  62 const struct dcerpc_interface_table *idl_iface_by_name(const char *name)
  63 {
  64         const struct dcerpc_interface_list *l;
  65         for (l=librpc_dcerpc_pipes();l;l=l->next) {
  66                 if (strcasecmp(l->table->name, name) == 0) {
  67                         return l->table;
  68                 }
  69         }
  70         return NULL;
  71 }
  72
  73 /*
  74   find a dcerpc interface by uuid
  75 */
  76 const struct dcerpc_interface_table *idl_iface_by_uuid(const char *uuid)
  77 {
  78         const struct dcerpc_interface_list *l;
  79         for (l=librpc_dcerpc_pipes();l;l=l->next) {
  80                 if (strcasecmp(l->table->uuid, uuid) == 0) {
  81                         return l->table;
  82                 }
  83         }
  84         return NULL;
  85 }
  86
  87
  88 /*
  89    push a dcerpc_packet into a blob, potentially with auth info
  90 */
  91 NTSTATUS dcerpc_push_auth(DATA_BLOB *blob, TALLOC_CTX *mem_ctx,
  92                           struct dcerpc_packet *pkt,
  93                           struct dcerpc_auth *auth_info)
  94 {
  95         NTSTATUS status;
  96         struct ndr_push *ndr;
  97
  98         ndr = ndr_push_init_ctx(mem_ctx);
  99         if (!ndr) {
 100                 return NT_STATUS_NO_MEMORY;
 101         }
 102
 103         if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
 104                 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
 105         }
 106
 107         if (pkt->pfc_flags & DCERPC_PFC_FLAG_ORPC) {
 108                 ndr->flags |= LIBNDR_FLAG_OBJECT_PRESENT;
 109         }
 110
 111         if (auth_info) {
 112                 pkt->auth_length = auth_info->credentials.length;
 113         } else {
 114                 pkt->auth_length = 0;
 115         }
 116
 117         status = ndr_push_dcerpc_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
 118         if (!NT_STATUS_IS_OK(status)) {
 119                 return status;
 120         }
 121
 122         if (auth_info) {
 123                 status = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, auth_info);
 124         }
 125
 126         *blob = ndr_push_blob(ndr);
 127
 128         /* fill in the frag length */
 129         dcerpc_set_frag_length(blob, blob->length);
 130
 131         return NT_STATUS_OK;
 132 }
 133
 134 #define MAX_PROTSEQ             10
 135
 136 static const struct {
 137         const char *name;
 138         enum dcerpc_transport_t transport;
 139         int num_protocols;
 140         enum epm_protocol protseq[MAX_PROTSEQ];
 141 } transports[] = {
 142         { "ncacn_np",     NCACN_NP, 3,
 143                 { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_SMB, EPM_PROTOCOL_NETBIOS }},
 144         { "ncacn_ip_tcp", NCACN_IP_TCP, 3,
 145                 { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_TCP, EPM_PROTOCOL_IP } },
 146         { "ncacn_http", NCACN_HTTP, 3,
 147                 { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_HTTP, EPM_PROTOCOL_IP } },
 148         { "ncadg_ip_udp", NCACN_IP_UDP, 3,
 149                 { EPM_PROTOCOL_NCADG, EPM_PROTOCOL_UDP, EPM_PROTOCOL_IP } },
 150         { "ncalrpc", NCALRPC, 2,
 151                 { EPM_PROTOCOL_NCALRPC, EPM_PROTOCOL_PIPE } },
 152         { "ncacn_unix_stream", NCACN_UNIX_STREAM, 2,
 153                 { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_UNIX_DS } },
 154         { "ncadg_unix_dgram", NCADG_UNIX_DGRAM, 2,
 155                 { EPM_PROTOCOL_NCADG, EPM_PROTOCOL_UNIX_DS } },
 156         { "ncacn_at_dsp", NCACN_AT_DSP, 3,
 157                 { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_APPLETALK, EPM_PROTOCOL_DSP } },
 158         { "ncadg_at_ddp", NCADG_AT_DDP, 3,
 159                 { EPM_PROTOCOL_NCADG, EPM_PROTOCOL_APPLETALK, EPM_PROTOCOL_DDP } },
 160         { "ncacn_vns_ssp", NCACN_VNS_SPP, 3,
 161                 { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_STREETTALK, EPM_PROTOCOL_VINES_SPP } },
 162         { "ncacn_vns_ipc", NCACN_VNS_IPC, 3,
 163                 { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_STREETTALK, EPM_PROTOCOL_VINES_IPC }, },
 164         { "ncadg_ipx", NCADG_IPX, 2,
 165                 { EPM_PROTOCOL_NCADG, EPM_PROTOCOL_IPX },
 166         },
 167         { "ncacn_spx", NCACN_SPX, 2,
 168                 { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_SPX },
 169         },
 170 };
 171
 172 static const struct {
 173         const char *name;
 174         uint32_t flag;
 175 } ncacn_options[] = {
 176         {"sign", DCERPC_SIGN},
 177         {"seal", DCERPC_SEAL},
 178         {"connect", DCERPC_CONNECT},
 179         {"spnego", DCERPC_AUTH_SPNEGO},
 180         {"krb5", DCERPC_AUTH_KRB5},
 181         {"validate", DCERPC_DEBUG_VALIDATE_BOTH},
 182         {"print", DCERPC_DEBUG_PRINT_BOTH},
 183         {"padcheck", DCERPC_DEBUG_PAD_CHECK},
 184         {"bigendian", DCERPC_PUSH_BIGENDIAN}
 185 };
 186
 187
 188
 189 /*
 190   form a binding string from a binding structure
 191 */
 192 const char *dcerpc_binding_string(TALLOC_CTX *mem_ctx, const struct dcerpc_binding *b)
 193 {
 194         char *s = talloc_strdup(mem_ctx, "");
 195         int i;
 196         const char *t_name=NULL;
 197
 198         for (i=0;i<ARRAY_SIZE(transports);i++) {
 199                 if (transports[i].transport == b->transport) {
 200                         t_name = transports[i].name;
 201                 }
 202         }
 203         if (!t_name) {
 204                 return NULL;
 205         }
 206
 207         if (!GUID_all_zero(&b->object)) {
 208                 s = talloc_asprintf(s, "%s@",
 209                                     GUID_string(mem_ctx, &b->object));
 210         }
 211
 212         s = talloc_asprintf_append(s, "%s:", t_name);
 213         if (!s) return NULL;
 214
 215         if (b->host) {
 216                 s = talloc_asprintf_append(s, "%s", b->host);
 217         }
 218
 219         if (!b->endpoint && !b->options && !b->flags) {
 220                 return s;
 221         }
 222
 223         s = talloc_asprintf_append(s, "[");
 224
 225         if (b->endpoint) {
 226                 s = talloc_asprintf_append(s, "%s", b->endpoint);
 227         }
 228
 229         /* this is a *really* inefficent way of dealing with strings,
 230            but this is rarely called and the strings are always short,
 231            so I don't care */
 232         for (i=0;b->options && b->options[i];i++) {
 233                 s = talloc_asprintf_append(s, ",%s", b->options[i]);
 234                 if (!s) return NULL;
 235         }
 236
 237         for (i=0;i<ARRAY_SIZE(ncacn_options);i++) {
 238                 if (b->flags & ncacn_options[i].flag) {
 239                         s = talloc_asprintf_append(s, ",%s", ncacn_options[i].name);
 240                         if (!s) return NULL;
 241                 }
 242         }
 243
 244         s = talloc_asprintf_append(s, "]");
 245
 246         return s;
 247 }
 248
 249 /*
 250   parse a binding string into a dcerpc_binding structure
 251 */
 252 NTSTATUS dcerpc_parse_binding(TALLOC_CTX *mem_ctx, const char *s, struct dcerpc_binding *b)
 253 {
 254         char *options, *type;
 255         char *p;
 256         int i, j, comma_count;
 257
 258         p = strchr(s, '@');
 259
 260         if (p && PTR_DIFF(p, s) == 36) { /* 36 is the length of a UUID */
 261                 NTSTATUS status;
 262
 263                 status = GUID_from_string(s, &b->object);
 264
 265                 if (NT_STATUS_IS_ERR(status)) {
 266                         DEBUG(0, ("Failed parsing UUID\n"));
 267                         return status;
 268                 }
 269
 270                 s = p + 1;
 271         } else {
 272                 ZERO_STRUCT(b->object);
 273         }
 274
 275         b->object_version = 0;
 276
 277         p = strchr(s, ':');
 278         if (!p) {
 279                 return NT_STATUS_INVALID_PARAMETER;
 280         }
 281
 282         type = talloc_strndup(mem_ctx, s, PTR_DIFF(p, s));
 283         if (!type) {
 284                 return NT_STATUS_NO_MEMORY;
 285         }
 286
 287         for (i=0;i<ARRAY_SIZE(transports);i++) {
 288                 if (strcasecmp(type, transports[i].name) == 0) {
 289                         b->transport = transports[i].transport;
 290                         break;
 291                 }
 292         }
 293         if (i==ARRAY_SIZE(transports)) {
 294                 DEBUG(0,("Unknown dcerpc transport '%s'\n", type));
 295                 return NT_STATUS_INVALID_PARAMETER;
 296         }
 297
 298         s = p+1;
 299
 300         p = strchr(s, '[');
 301         if (p) {
 302                 b->host = talloc_strndup(mem_ctx, s, PTR_DIFF(p, s));
 303                 options = talloc_strdup(mem_ctx, p+1);
 304                 if (options[strlen(options)-1] != ']') {
 305                         return NT_STATUS_INVALID_PARAMETER;
 306                 }
 307                 options[strlen(options)-1] = 0;
 308         } else {
 309                 b->host = talloc_strdup(mem_ctx, s);
 310                 options = NULL;
 311         }
 312
 313         if (!b->host) {
 314                 return NT_STATUS_NO_MEMORY;
 315         }
 316
 317         b->options = NULL;
 318         b->flags = 0;
 319         b->endpoint = NULL;
 320
 321         if (!options) {
 322                 return NT_STATUS_OK;
 323         }
 324
 325         comma_count = count_chars(options, ',');
 326
 327         b->options = talloc_array(mem_ctx, const char *, comma_count+2);
 328         if (!b->options) {
 329                 return NT_STATUS_NO_MEMORY;
 330         }
 331
 332         for (i=0; (p = strchr(options, ',')); i++) {
 333                 b->options[i] = talloc_strndup(mem_ctx, options, PTR_DIFF(p, options));
 334                 if (!b->options[i]) {
 335                         return NT_STATUS_NO_MEMORY;
 336                 }
 337                 options = p+1;
 338         }
 339         b->options[i] = options;
 340         b->options[i+1] = NULL;
 341
 342         /* some options are pre-parsed for convenience */
 343         for (i=0;b->options[i];i++) {
 344                 for (j=0;j<ARRAY_SIZE(ncacn_options);j++) {
 345                         if (strcasecmp(ncacn_options[j].name, b->options[i]) == 0) {
 346                                 int k;
 347                                 b->flags |= ncacn_options[j].flag;
 348                                 for (k=i;b->options[k];k++) {
 349                                         b->options[k] = b->options[k+1];
 350                                 }
 351                                 i--;
 352                                 break;
 353                         }
 354                 }
 355         }
 356
 357         if (b->options[0]) {
 358                 /* Endpoint is first option */
 359                 b->endpoint = b->options[0];
 360                 if (strlen(b->endpoint) == 0) b->endpoint = NULL;
 361
 362                 for (i=0;b->options[i];i++) {
 363                         b->options[i] = b->options[i+1];
 364                 }
 365         }
 366
 367         if (b->options[0] == NULL)
 368                 b->options = NULL;
 369
 370         return NT_STATUS_OK;
 371 }
 372
 373 const char *dcerpc_floor_get_rhs_data(TALLOC_CTX *mem_ctx, struct epm_floor *floor)
 374 {
 375         switch (floor->lhs.protocol) {
 376         case EPM_PROTOCOL_TCP:
 377                 if (floor->rhs.tcp.port == 0) return NULL;
 378                 return talloc_asprintf(mem_ctx, "%d", floor->rhs.tcp.port);
 379
 380         case EPM_PROTOCOL_UDP:
 381                 if (floor->rhs.udp.port == 0) return NULL;
 382                 return talloc_asprintf(mem_ctx, "%d", floor->rhs.udp.port);
 383
 384         case EPM_PROTOCOL_HTTP:
 385                 if (floor->rhs.http.port == 0) return NULL;
 386                 return talloc_asprintf(mem_ctx, "%d", floor->rhs.http.port);
 387
 388         case EPM_PROTOCOL_IP:
 389                 return talloc_strdup(mem_ctx, floor->rhs.ip.ipaddr);
 390
 391         case EPM_PROTOCOL_NCACN:
 392                 return NULL;
 393
 394         case EPM_PROTOCOL_NCADG:
 395                 return NULL;
 396
 397         case EPM_PROTOCOL_SMB:
 398                 if (strlen(floor->rhs.smb.unc) == 0) return NULL;
 399                 return talloc_strdup(mem_ctx, floor->rhs.smb.unc);
 400
 401         case EPM_PROTOCOL_PIPE:
 402                 if (strlen(floor->rhs.pipe.path) == 0) return NULL;
 403                 return talloc_strdup(mem_ctx, floor->rhs.pipe.path);
 404
 405         case EPM_PROTOCOL_NETBIOS:
 406                 if (strlen(floor->rhs.netbios.name) == 0) return NULL;
 407                 return talloc_strdup(mem_ctx, floor->rhs.netbios.name);
 408
 409         case EPM_PROTOCOL_NCALRPC:
 410                 return NULL;
 411
 412         case EPM_PROTOCOL_VINES_SPP:
 413                 return talloc_asprintf(mem_ctx, "%d", floor->rhs.vines_spp.port);
 414
 415         case EPM_PROTOCOL_VINES_IPC:
 416                 return talloc_asprintf(mem_ctx, "%d", floor->rhs.vines_ipc.port);
 417
 418         case EPM_PROTOCOL_STREETTALK:
 419                 return talloc_strdup(mem_ctx, floor->rhs.streettalk.streettalk);
 420
 421         case EPM_PROTOCOL_UNIX_DS:
 422                 if (strlen(floor->rhs.unix_ds.path) == 0) return NULL;
 423                 return talloc_strdup(mem_ctx, floor->rhs.unix_ds.path);
 424
 425         case EPM_PROTOCOL_NULL:
 426                 return NULL;
 427
 428         default:
 429                 DEBUG(0,("Unsupported lhs protocol %d\n", floor->lhs.protocol));
 430                 break;
 431         }
 432
 433         return NULL;
 434 }
 435
 436 static NTSTATUS dcerpc_floor_set_rhs_data(TALLOC_CTX *mem_ctx, struct epm_floor *floor,  const char *data)
 437 {
 438         switch (floor->lhs.protocol) {
 439         case EPM_PROTOCOL_TCP:
 440                 floor->rhs.tcp.port = atoi(data);
 441                 return NT_STATUS_OK;
 442
 443         case EPM_PROTOCOL_UDP:
 444                 floor->rhs.udp.port = atoi(data);
 445                 return NT_STATUS_OK;
 446
 447         case EPM_PROTOCOL_HTTP:
 448                 floor->rhs.http.port = atoi(data);
 449                 return NT_STATUS_OK;
 450
 451         case EPM_PROTOCOL_IP:
 452                 floor->rhs.ip.ipaddr = talloc_strdup(mem_ctx, data);
 453                 NT_STATUS_HAVE_NO_MEMORY(floor->rhs.ip.ipaddr);
 454                 return NT_STATUS_OK;
 455
 456         case EPM_PROTOCOL_NCACN:
 457                 floor->rhs.ncacn.minor_version = 0;
 458                 return NT_STATUS_OK;
 459
 460         case EPM_PROTOCOL_NCADG:
 461                 floor->rhs.ncadg.minor_version = 0;
 462                 return NT_STATUS_OK;
 463
 464         case EPM_PROTOCOL_SMB:
 465                 floor->rhs.smb.unc = talloc_strdup(mem_ctx, data);
 466                 NT_STATUS_HAVE_NO_MEMORY(floor->rhs.smb.unc);
 467                 return NT_STATUS_OK;
 468
 469         case EPM_PROTOCOL_PIPE:
 470                 floor->rhs.pipe.path = talloc_strdup(mem_ctx, data);
 471                 NT_STATUS_HAVE_NO_MEMORY(floor->rhs.pipe.path);
 472                 return NT_STATUS_OK;
 473
 474         case EPM_PROTOCOL_NETBIOS:
 475                 floor->rhs.netbios.name = talloc_strdup(mem_ctx, data);
 476                 NT_STATUS_HAVE_NO_MEMORY(floor->rhs.netbios.name);
 477                 return NT_STATUS_OK;
 478
 479         case EPM_PROTOCOL_NCALRPC:
 480                 return NT_STATUS_OK;
 481
 482         case EPM_PROTOCOL_VINES_SPP:
 483                 floor->rhs.vines_spp.port = atoi(data);
 484                 return NT_STATUS_OK;
 485
 486         case EPM_PROTOCOL_VINES_IPC:
 487                 floor->rhs.vines_ipc.port = atoi(data);
 488                 return NT_STATUS_OK;
 489
 490         case EPM_PROTOCOL_STREETTALK:
 491                 floor->rhs.streettalk.streettalk = talloc_strdup(mem_ctx, data);
 492                 NT_STATUS_HAVE_NO_MEMORY(floor->rhs.streettalk.streettalk);
 493                 return NT_STATUS_OK;
 494
 495         case EPM_PROTOCOL_UNIX_DS:
 496                 floor->rhs.unix_ds.path = talloc_strdup(mem_ctx, data);
 497                 NT_STATUS_HAVE_NO_MEMORY(floor->rhs.unix_ds.path);
 498                 return NT_STATUS_OK;
 499
 500         case EPM_PROTOCOL_NULL:
 501                 return NT_STATUS_OK;
 502
 503         default:
 504                 DEBUG(0,("Unsupported lhs protocol %d\n", floor->lhs.protocol));
 505                 break;
 506         }
 507
 508         return NT_STATUS_NOT_SUPPORTED;
 509 }
 510
 511 enum dcerpc_transport_t dcerpc_transport_by_endpoint_protocol(int prot)
 512 {
 513         int i;
 514
 515         /* Find a transport that has 'prot' as 4th protocol */
 516         for (i=0;i<ARRAY_SIZE(transports);i++) {
 517                 if (transports[i].num_protocols >= 2 &&
 518                         transports[i].protseq[1] == prot) {
 519                         return transports[i].transport;
 520                 }
 521         }
 522
 523         /* Unknown transport */
 524         return -1;
 525 }
 526
 527 enum dcerpc_transport_t dcerpc_transport_by_tower(struct epm_tower *tower)
 528 {
 529         int i;
 530
 531         /* Find a transport that matches this tower */
 532         for (i=0;i<ARRAY_SIZE(transports);i++) {
 533                 int j;
 534                 if (transports[i].num_protocols != tower->num_floors - 2) {
 535                         continue;
 536                 }
 537
 538                 for (j = 0; j < transports[i].num_protocols; j++) {
 539                         if (transports[i].protseq[j] != tower->floors[j+2].lhs.protocol) {
 540                                 break;
 541                         }
 542                 }
 543
 544                 if (j == transports[i].num_protocols) {
 545                         return transports[i].transport;
 546                 }
 547         }
 548
 549         /* Unknown transport */
 550         return -1;
 551 }
 552
 553 NTSTATUS dcerpc_binding_from_tower(TALLOC_CTX *mem_ctx, struct epm_tower *tower, struct dcerpc_binding *binding)
 554 {
 555         ZERO_STRUCT(binding->object);
 556         binding->options = NULL;
 557         binding->host = NULL;
 558         binding->flags = 0;
 559
 560         binding->transport = dcerpc_transport_by_tower(tower);
 561
 562         if (binding->transport == -1) {
 563                 return NT_STATUS_NOT_SUPPORTED;
 564         }
 565
 566         if (tower->num_floors < 1) {
 567                 return NT_STATUS_OK;
 568         }
 569
 570         /* Set object uuid */
 571         binding->object = tower->floors[0].lhs.info.uuid.uuid;
 572         binding->object_version = tower->floors[0].lhs.info.uuid.version;
 573
 574         /* Ignore floor 1, it contains the NDR version info */
 575
 576         binding->options = NULL;
 577
 578         /* Set endpoint */
 579         if (tower->num_floors >= 4) {
 580                 binding->endpoint = dcerpc_floor_get_rhs_data(mem_ctx, &tower->floors[3]);
 581         } else {
 582                 binding->endpoint = NULL;
 583         }
 584
 585         /* Set network address */
 586         if (tower->num_floors >= 5) {
 587                 binding->host = dcerpc_floor_get_rhs_data(mem_ctx, &tower->floors[4]);
 588         }
 589         return NT_STATUS_OK;
 590 }
 591
 592 NTSTATUS dcerpc_binding_build_tower(TALLOC_CTX *mem_ctx, struct dcerpc_binding *binding, struct epm_tower *tower)
 593 {
 594         const enum epm_protocol *protseq = NULL;
 595         int num_protocols = -1, i;
 596         NTSTATUS status;
 597
 598         /* Find transport */
 599         for (i=0;i<ARRAY_SIZE(transports);i++) {
 600                 if (transports[i].transport == binding->transport) {
 601                         protseq = transports[i].protseq;
 602                         num_protocols = transports[i].num_protocols;
 603                         break;
 604                 }
 605         }
 606
 607         if (num_protocols == -1) {
 608                 DEBUG(0, ("Unable to find transport with id '%d'\n", binding->transport));
 609                 return NT_STATUS_UNSUCCESSFUL;
 610         }
 611
 612         tower->num_floors = 2 + num_protocols;
 613         tower->floors = talloc_array(mem_ctx, struct epm_floor, tower->num_floors);
 614
 615         /* Floor 0 */
 616         tower->floors[0].lhs.protocol = EPM_PROTOCOL_UUID;
 617         tower->floors[0].lhs.info.uuid.uuid = binding->object;
 618         tower->floors[0].lhs.info.uuid.version = binding->object_version;
 619         tower->floors[0].rhs.uuid.unknown = 0;
 620
 621         /* Floor 1 */
 622         tower->floors[1].lhs.protocol = EPM_PROTOCOL_UUID;
 623         tower->floors[1].lhs.info.uuid.version = NDR_GUID_VERSION;
 624         tower->floors[1].rhs.uuid.unknown = 0;
 625         status = GUID_from_string(NDR_GUID, &tower->floors[1].lhs.info.uuid.uuid);
 626         if (NT_STATUS_IS_ERR(status)) {
 627                 return status;
 628         }
 629
 630         /* Floor 2 to num_protocols */
 631         for (i = 0; i < num_protocols; i++) {
 632                 tower->floors[2 + i].lhs.protocol = protseq[i];
 633                 tower->floors[2 + i].lhs.info.lhs_data = data_blob_talloc(mem_ctx, NULL, 0);
 634                 ZERO_STRUCT(tower->floors[2 + i].rhs);
 635                 dcerpc_floor_set_rhs_data(mem_ctx, &tower->floors[2 + i], "");
 636         }
 637
 638         /* The 4th floor contains the endpoint */
 639         if (num_protocols >= 2 && binding->endpoint) {
 640                 status = dcerpc_floor_set_rhs_data(mem_ctx, &tower->floors[3], binding->endpoint);
 641                 if (NT_STATUS_IS_ERR(status)) {
 642                         return status;
 643                 }
 644         }
 645
 646         /* The 5th contains the network address */
 647         if (num_protocols >= 3 && binding->host) {
 648                 status = dcerpc_floor_set_rhs_data(mem_ctx, &tower->floors[4], binding->host);
 649                 if (NT_STATUS_IS_ERR(status)) {
 650                         return status;
 651                 }
 652         }
 653
 654         return NT_STATUS_OK;
 655 }
 656
 657 NTSTATUS dcerpc_epm_map_binding(TALLOC_CTX *mem_ctx, struct dcerpc_binding *binding,
 658                                  const char *uuid, uint_t version)
 659 {
 660         struct dcerpc_pipe *p;
 661         NTSTATUS status;
 662         struct epm_Map r;
 663         struct policy_handle handle;
 664         struct GUID guid;
 665         struct epm_twr_t twr, *twr_r;
 666         struct dcerpc_binding epmapper_binding;
 667         const struct dcerpc_interface_table *table = idl_iface_by_uuid(uuid);
 668         int i;
 669
 670         /* First, check if there is a default endpoint specified in the IDL */
 671
 672         if (table) {
 673                 struct dcerpc_binding default_binding;
 674
 675                 /* Find one of the default pipes for this interface */
 676                 for (i = 0; i < table->endpoints->count; i++) {
 677                         status = dcerpc_parse_binding(mem_ctx, table->endpoints->names[i], &default_binding);
 678
 679                         if (NT_STATUS_IS_OK(status) && default_binding.transport == binding->transport && default_binding.endpoint) {
 680                                 binding->endpoint = talloc_strdup(mem_ctx, default_binding.endpoint);
 681                                 return NT_STATUS_OK;
 682                         }
 683                 }
 684         }
 685
 686
 687         ZERO_STRUCT(epmapper_binding);
 688         epmapper_binding.transport = binding->transport;
 689         epmapper_binding.host = binding->host;
 690         epmapper_binding.options = NULL;
 691         epmapper_binding.flags = 0;
 692         epmapper_binding.endpoint = NULL;
 693
 694         status = dcerpc_pipe_connect_b(&p,
 695                                         &epmapper_binding,
 696                                    DCERPC_EPMAPPER_UUID,
 697                                    DCERPC_EPMAPPER_VERSION,
 698                                    NULL, NULL, NULL);
 699
 700         if (!NT_STATUS_IS_OK(status)) {
 701                 return status;
 702         }
 703
 704         ZERO_STRUCT(handle);
 705         ZERO_STRUCT(guid);
 706
 707         status = GUID_from_string(uuid, &binding->object);
 708         if (NT_STATUS_IS_ERR(status)) {
 709                 return status;
 710         }
 711
 712         binding->object_version = version;
 713
 714         status = dcerpc_binding_build_tower(p, binding, &twr.tower);
 715         if (NT_STATUS_IS_ERR(status)) {
 716                 return status;
 717         }
 718
 719         /* with some nice pretty paper around it of course */
 720         r.in.object = &guid;
 721         r.in.map_tower = &twr;
 722         r.in.entry_handle = &handle;
 723         r.in.max_towers = 1;
 724         r.out.entry_handle = &handle;
 725
 726         status = dcerpc_epm_Map(p, p, &r);
 727         if (!NT_STATUS_IS_OK(status)) {
 728                 dcerpc_pipe_close(p);
 729                 return status;
 730         }
 731         if (r.out.result != 0 || r.out.num_towers != 1) {
 732                 dcerpc_pipe_close(p);
 733                 return NT_STATUS_PORT_UNREACHABLE;
 734         }
 735
 736         twr_r = r.out.towers[0].twr;
 737         if (!twr_r) {
 738                 dcerpc_pipe_close(p);
 739                 return NT_STATUS_PORT_UNREACHABLE;
 740         }
 741
 742         if (twr_r->tower.num_floors != twr.tower.num_floors ||
 743             twr_r->tower.floors[3].lhs.protocol != twr.tower.floors[3].lhs.protocol) {
 744                 dcerpc_pipe_close(p);
 745                 return NT_STATUS_PORT_UNREACHABLE;
 746         }
 747
 748         binding->endpoint = dcerpc_floor_get_rhs_data(mem_ctx, &twr_r->tower.floors[3]);
 749
 750         dcerpc_pipe_close(p);
 751
 752         return NT_STATUS_OK;
 753 }
 754
 755
 756 /*
 757    perform an authenticated bind if needed
 758 */
 759 static NTSTATUS dcerpc_pipe_auth(struct dcerpc_pipe *p,
 760                                  struct dcerpc_binding *binding,
 761                                  const char *pipe_uuid,
 762                                  uint32_t pipe_version,
 763                                  const char *domain,
 764                                  const char *username,
 765                                  const char *password)
 766 {
 767         NTSTATUS status;
 768         p->conn->flags = binding->flags;
 769
 770         /* remember the binding string for possible secondary connections */
 771         p->conn->binding_string = dcerpc_binding_string(p, binding);
 772
 773         if (username && username[0] && (binding->flags & DCERPC_SCHANNEL_ANY)) {
 774                 status = dcerpc_bind_auth_schannel(p, pipe_uuid, pipe_version,
 775                                                    domain, username, password);
 776         } else if (username && username[0]) {
 777                 uint8_t auth_type;
 778                 if (binding->flags & DCERPC_AUTH_SPNEGO) {
 779                         auth_type = DCERPC_AUTH_TYPE_SPNEGO;
 780                 } else if (binding->flags & DCERPC_AUTH_KRB5) {
 781                         auth_type = DCERPC_AUTH_TYPE_KRB5;
 782                 } else {
 783                         auth_type = DCERPC_AUTH_TYPE_NTLMSSP;
 784                 }
 785
 786                 status = dcerpc_bind_auth_password(p, pipe_uuid, pipe_version,
 787                                                    domain, username, password,
 788                                                    auth_type);
 789         } else {
 790                 status = dcerpc_bind_auth_none(p, pipe_uuid, pipe_version);
 791         }
 792
 793         if (!NT_STATUS_IS_OK(status)) {
 794                 DEBUG(0,("Failed to bind to uuid %s - %s\n", pipe_uuid, nt_errstr(status)));
 795         }
 796         return status;
 797 }
 798
 799
 800 /* open a rpc connection to a rpc pipe on SMB using the binding
 801    structure to determine the endpoint and options */
 802 static NTSTATUS dcerpc_pipe_connect_ncacn_np(struct dcerpc_pipe **pp,
 803                                              struct dcerpc_binding *binding,
 804                                              const char *pipe_uuid,
 805                                              uint32_t pipe_version,
 806                                              const char *domain,
 807                                              const char *username,
 808                                              const char *password)
 809 {
 810         struct dcerpc_pipe *p;
 811         NTSTATUS status;
 812         struct smbcli_state *cli;
 813         const char *pipe_name = NULL;
 814         TALLOC_CTX *tmp_ctx;
 815
 816         *pp = NULL;
 817
 818         p = dcerpc_pipe_init(NULL);
 819         if (p == NULL) {
 820                 return NT_STATUS_NO_MEMORY;
 821         }
 822         tmp_ctx = talloc_new(p);
 823
 824         /* Look up identifier using the epmapper */
 825         if (!binding->endpoint) {
 826                 status = dcerpc_epm_map_binding(tmp_ctx, binding, pipe_uuid, pipe_version);
 827                 if (!NT_STATUS_IS_OK(status)) {
 828                         DEBUG(0,("Failed to map DCERPC/TCP NCACN_NP pipe for '%s' - %s\n",
 829                                  pipe_uuid, nt_errstr(status)));
 830                         talloc_free(p);
 831                         return status;
 832                 }
 833                 DEBUG(1,("Mapped to DCERPC/NP pipe %s\n", binding->endpoint));
 834         }
 835
 836         pipe_name = binding->endpoint;
 837
 838         if (!strncasecmp(pipe_name, "/pipe/", 6) ||
 839             !strncasecmp(pipe_name, "\\pipe\\", 6)) {
 840                 pipe_name += 6;
 841         }
 842
 843         if (pipe_name[0] != '\\') {
 844                 pipe_name = talloc_asprintf(tmp_ctx, "\\%s", pipe_name);
 845         }
 846
 847         if (!username || !username[0] ||
 848             (binding->flags & DCERPC_SCHANNEL_ANY)) {
 849                 status = smbcli_full_connection(p->conn, &cli, lp_netbios_name(),
 850                                                 binding->host,
 851                                                 "ipc$", NULL,
 852                                                 "", "", NULL);
 853         } else {
 854                 status = smbcli_full_connection(p->conn, &cli, lp_netbios_name(),
 855                                                 binding->host,
 856                                                 "ipc$", NULL,
 857                                                 username, domain,
 858                                                 password);
 859         }
 860         if (!NT_STATUS_IS_OK(status)) {
 861                 DEBUG(0,("Failed to connect to %s - %s\n", binding->host, nt_errstr(status)));
 862                 talloc_free(p);
 863                 return status;
 864         }
 865
 866         status = dcerpc_pipe_open_smb(p->conn, cli->tree, pipe_name);
 867         if (!NT_STATUS_IS_OK(status)) {
 868                 DEBUG(0,("Failed to open pipe %s - %s\n", pipe_name, nt_errstr(status)));
 869                 talloc_free(p);
 870                 return status;
 871         }
 872
 873         if (!(binding->flags & DCERPC_AUTH_OPTIONS)) {
 874                 username = NULL;
 875         }
 876
 877         status = dcerpc_pipe_auth(p, binding, pipe_uuid, pipe_version, domain, username, password);
 878         if (!NT_STATUS_IS_OK(status)) {
 879                 talloc_free(p);
 880                 return status;
 881         }
 882
 883         (*pp) = p;
 884         talloc_free(tmp_ctx);
 885
 886         return NT_STATUS_OK;
 887 }
 888
 889 /* open a rpc connection to a rpc pipe on SMP using the binding
 890    structure to determine the endpoint and options */
 891 static NTSTATUS dcerpc_pipe_connect_ncalrpc(struct dcerpc_pipe **pp,
 892                                             struct dcerpc_binding *binding,
 893                                             const char *pipe_uuid,
 894                                             uint32_t pipe_version,
 895                                             const char *domain,
 896                                             const char *username,
 897                                             const char *password)
 898 {
 899         NTSTATUS status;
 900         struct dcerpc_pipe *p;
 901         TALLOC_CTX *tmp_ctx;
 902
 903         (*pp) = NULL;
 904
 905         p = dcerpc_pipe_init(NULL);
 906         if (p == NULL) {
 907                 return NT_STATUS_NO_MEMORY;
 908         }
 909         tmp_ctx = talloc_new(p);
 910
 911         /* Look up identifier using the epmapper */
 912         if (!binding->endpoint) {
 913                 status = dcerpc_epm_map_binding(tmp_ctx, binding, pipe_uuid, pipe_version);
 914                 if (!NT_STATUS_IS_OK(status)) {
 915                         DEBUG(0,("Failed to map DCERPC/TCP NCALRPC identifier for '%s' - %s\n",
 916                                  pipe_uuid, nt_errstr(status)));
 917                         talloc_free(p);
 918                         return status;
 919                 }
 920                 DEBUG(1,("Mapped to DCERPC/LRPC identifier %s\n", binding->endpoint));
 921         }
 922
 923         status = dcerpc_pipe_open_pipe(p->conn, binding->endpoint);
 924         if (!NT_STATUS_IS_OK(status)) {
 925                 DEBUG(0,("Failed to open ncalrpc pipe '%s' - %s\n",
 926                          binding->endpoint, nt_errstr(status)));
 927                 talloc_free(p);
 928                 return status;
 929         }
 930
 931         status = dcerpc_pipe_auth(p, binding, pipe_uuid, pipe_version, domain, username, password);
 932         if (!NT_STATUS_IS_OK(status)) {
 933                 talloc_free(p);
 934                 return status;
 935         }
 936
 937         (*pp) = p;
 938         talloc_free(tmp_ctx);
 939
 940         return status;
 941 }
 942
 943
 944
 945 /* open a rpc connection to a rpc pipe on SMP using the binding
 946    structure to determine the endpoint and options */
 947 static NTSTATUS dcerpc_pipe_connect_ncacn_unix_stream(struct dcerpc_pipe **pp,
 948                                                       struct dcerpc_binding *binding,
 949                                                       const char *pipe_uuid,
 950                                                       uint32_t pipe_version,
 951                                                       const char *domain,
 952                                                       const char *username,
 953                                                       const char *password)
 954 {
 955         NTSTATUS status;
 956         struct dcerpc_pipe *p;
 957
 958         (*pp) = NULL;
 959
 960         if (!binding->endpoint) {
 961                 DEBUG(0, ("Path to unix socket not specified\n"));
 962                 return NT_STATUS_INVALID_PARAMETER;
 963         }
 964
 965         p = dcerpc_pipe_init(NULL);
 966         if (p == NULL) {
 967                 return NT_STATUS_NO_MEMORY;
 968         }
 969
 970         status = dcerpc_pipe_open_unix_stream(p->conn, binding->endpoint);
 971         if (!NT_STATUS_IS_OK(status)) {
 972                 DEBUG(0,("Failed to open unix socket %s - %s\n",
 973                          binding->endpoint, nt_errstr(status)));
 974                 talloc_free(p);
 975                 return status;
 976         }
 977
 978         status = dcerpc_pipe_auth(p, binding, pipe_uuid, pipe_version, domain, username, password);
 979         if (!NT_STATUS_IS_OK(status)) {
 980                 talloc_free(p);
 981                 return status;
 982         }
 983
 984         (*pp) = p;
 985
 986         return status;
 987 }
 988
 989 /* open a rpc connection to a rpc pipe on SMP using the binding
 990    structure to determine the endpoint and options */
 991 static NTSTATUS dcerpc_pipe_connect_ncacn_ip_tcp(struct dcerpc_pipe **pp,
 992                                                  struct dcerpc_binding *binding,
 993                                                  const char *pipe_uuid,
 994                                                  uint32_t pipe_version,
 995                                                  const char *domain,
 996                                                  const char *username,
 997                                                  const char *password)
 998 {
 999         NTSTATUS status;
1000         uint32_t port = 0;
1001         struct dcerpc_pipe *p;
1002         TALLOC_CTX *tmp_ctx;
1003
1004         (*pp) = NULL;
1005
1006         p = dcerpc_pipe_init(NULL);
1007         if (p == NULL) {
1008                 return NT_STATUS_NO_MEMORY;
1009         }
1010         tmp_ctx = talloc_new(p);
1011
1012         if (!binding->endpoint) {
1013                 status = dcerpc_epm_map_binding(tmp_ctx, binding,
1014                                                 pipe_uuid, pipe_version);
1015                 if (!NT_STATUS_IS_OK(status)) {
1016                         DEBUG(0,("Failed to map DCERPC/TCP port for '%s' - %s\n",
1017                                  pipe_uuid, nt_errstr(status)));
1018                         talloc_free(p);
1019                         return status;
1020                 }
1021                 DEBUG(1,("Mapped to DCERPC/TCP port %s\n", binding->endpoint));
1022         }
1023
1024         port = atoi(binding->endpoint);
1025
1026         status = dcerpc_pipe_open_tcp(p->conn, binding->host, port);
1027         if (!NT_STATUS_IS_OK(status)) {
1028                 DEBUG(0,("Failed to connect to %s:%d - %s\n",
1029                          binding->host, port, nt_errstr(status)));
1030                 talloc_free(p);
1031                 return status;
1032         }
1033
1034         status = dcerpc_pipe_auth(p, binding, pipe_uuid, pipe_version, domain, username, password);
1035         if (!NT_STATUS_IS_OK(status)) {
1036                 talloc_free(p);
1037                 return status;
1038         }
1039
1040         (*pp) = p;
1041         talloc_free(tmp_ctx);
1042
1043         return status;
1044 }
1045
1046
1047 /* open a rpc connection to a rpc pipe, using the specified
1048    binding structure to determine the endpoint and options */
1049 NTSTATUS dcerpc_pipe_connect_b(struct dcerpc_pipe **pp,
1050                                struct dcerpc_binding *binding,
1051                                const char *pipe_uuid,
1052                                uint32_t pipe_version,
1053                                const char *domain,
1054                                const char *username,
1055                                const char *password)
1056 {
1057         NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
1058
1059         switch (binding->transport) {
1060         case NCACN_NP:
1061                 status = dcerpc_pipe_connect_ncacn_np(pp, binding, pipe_uuid, pipe_version,
1062                                                       domain, username, password);
1063                 break;
1064         case NCACN_IP_TCP:
1065                 status = dcerpc_pipe_connect_ncacn_ip_tcp(pp, binding, pipe_uuid, pipe_version,
1066                                                           domain, username, password);
1067                 break;
1068         case NCACN_UNIX_STREAM:
1069                 status = dcerpc_pipe_connect_ncacn_unix_stream(pp, binding, pipe_uuid, pipe_version,
1070                                                                domain, username, password);
1071                 break;
1072         case NCALRPC:
1073                 status = dcerpc_pipe_connect_ncalrpc(pp, binding, pipe_uuid, pipe_version,
1074                                                      domain, username, password);
1075                 break;
1076         default:
1077                 return NT_STATUS_NOT_SUPPORTED;
1078         }
1079
1080         return status;
1081 }
1082
1083
1084 /* open a rpc connection to a rpc pipe, using the specified string
1085    binding to determine the endpoint and options */
1086 NTSTATUS dcerpc_pipe_connect(struct dcerpc_pipe **pp,
1087                              const char *binding,
1088                              const char *pipe_uuid,
1089                              uint32_t pipe_version,
1090                              const char *domain,
1091                              const char *username,
1092                              const char *password)
1093 {
1094         struct dcerpc_binding b;
1095         NTSTATUS status;
1096         TALLOC_CTX *tmp_ctx;
1097
1098         tmp_ctx = talloc_new(NULL);
1099
1100         status = dcerpc_parse_binding(tmp_ctx, binding, &b);
1101         if (!NT_STATUS_IS_OK(status)) {
1102                 DEBUG(0,("Failed to parse dcerpc binding '%s'\n", binding));
1103                 talloc_free(tmp_ctx);
1104                 return status;
1105         }
1106
1107         DEBUG(3,("Using binding %s\n", dcerpc_binding_string(tmp_ctx, &b)));
1108
1109         status = dcerpc_pipe_connect_b(pp, &b, pipe_uuid, pipe_version, domain, username, password);
1110
1111         talloc_free(tmp_ctx);
1112
1113         return status;
1114 }
1115
1116
1117 /*
1118   create a secondary dcerpc connection from a primary connection
1119
1120   if the primary is a SMB connection then the secondary connection
1121   will be on the same SMB connection, but use a new fnum
1122 */
1123 NTSTATUS dcerpc_secondary_connection(struct dcerpc_pipe *p, struct dcerpc_pipe **p2,
1124                                      const char *pipe_name,
1125                                      const char *pipe_uuid,
1126                                      uint32_t pipe_version)
1127 {
1128         struct smbcli_tree *tree;
1129         NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
1130         struct dcerpc_binding b;
1131
1132         (*p2) = dcerpc_pipe_init(p);
1133         if (*p2 == NULL) {
1134                 return NT_STATUS_NO_MEMORY;
1135         }
1136
1137         switch (p->conn->transport.transport) {
1138         case NCACN_NP:
1139                 tree = dcerpc_smb_tree(p->conn);
1140                 if (!tree) {
1141                         return NT_STATUS_INVALID_PARAMETER;
1142                 }
1143                 status = dcerpc_pipe_open_smb((*p2)->conn, tree, pipe_name);
1144                 break;
1145
1146         case NCACN_IP_TCP:
1147                 status = dcerpc_parse_binding(p, p->conn->binding_string, &b);
1148                 if (!NT_STATUS_IS_OK(status)) {
1149                         return status;
1150                 }
1151                 status = dcerpc_pipe_open_tcp((*p2)->conn, b.host, atoi(b.endpoint));
1152                 break;
1153
1154         case NCALRPC:
1155                 status = dcerpc_parse_binding(p, p->conn->binding_string, &b);
1156                 if (!NT_STATUS_IS_OK(status)) {
1157                         return status;
1158                 }
1159                 status = dcerpc_pipe_open_pipe((*p2)->conn, b.endpoint);
1160                 break;
1161
1162         default:
1163                 return NT_STATUS_NOT_SUPPORTED;
1164         }
1165
1166         if (!NT_STATUS_IS_OK(status)) {
1167                 talloc_free(*p2);
1168                 return status;
1169         }
1170
1171         (*p2)->conn->flags = p->conn->flags;
1172
1173         status = dcerpc_bind_auth_none(*p2, pipe_uuid, pipe_version);
1174         if (!NT_STATUS_IS_OK(status)) {
1175                 talloc_free(*p2);
1176                 return status;
1177         }
1178
1179         return NT_STATUS_OK;
1180 }
1181
1182 NTSTATUS dcerpc_generic_session_key(struct dcerpc_connection *c,
1183                                     DATA_BLOB *session_key)
1184 {
1185         /* this took quite a few CPU cycles to find ... */
1186         session_key->data = discard_const_p(unsigned char, "SystemLibraryDTC");
1187         session_key->length = 16;
1188         return NT_STATUS_OK;
1189 }
1190
1191 /*
1192   fetch the user session key - may be default (above) or the SMB session key
1193 */
1194 NTSTATUS dcerpc_fetch_session_key(struct dcerpc_pipe *p,
1195                                   DATA_BLOB *session_key)
1196 {
1197         return p->conn->security_state.session_key(p->conn, session_key);
1198 }
1199
1200
1201 /*
1202   log a rpc packet in a format suitable for ndrdump. This is especially useful
1203   for sealed packets, where ethereal cannot easily see the contents
1204
1205   this triggers on a debug level of >= 10
1206 */
1207 void dcerpc_log_packet(const struct dcerpc_interface_table *ndr,
1208                        uint32_t opnum, uint32_t flags, DATA_BLOB *pkt)
1209 {
1210         const int num_examples = 20;
1211         int i;
1212
1213         if (DEBUGLEVEL < 10) return;
1214
1215         for (i=0;i<num_examples;i++) {
1216                 char *name=NULL;
1217                 asprintf(&name, "%s/rpclog/%s-%u.%d.%s",
1218                          lp_lockdir(), ndr->name, opnum, i,
1219                          (flags&NDR_IN)?"in":"out");
1220                 if (name == NULL) {
1221                         return;
1222                 }
1223                 if (!file_exist(name, NULL)) {
1224                         if (file_save(name, pkt->data, pkt->length)) {
1225                                 DEBUG(10,("Logged rpc packet to %s\n", name));
1226                         }
1227                         free(name);
1228                         break;
1229                 }
1230                 free(name);
1231         }
1232 }
1233
1234
1235
1236 /*
1237   create a secondary context from a primary connection
1238
1239   this uses dcerpc_alter_context() to create a new dcerpc context_id
1240 */
1241 NTSTATUS dcerpc_secondary_context(struct dcerpc_pipe *p,
1242                                   struct dcerpc_pipe **pp2,
1243                                   const char *pipe_uuid,
1244                                   uint32_t pipe_version)
1245 {
1246         NTSTATUS status;
1247         struct dcerpc_pipe *p2;
1248
1249         p2 = talloc_zero(p, struct dcerpc_pipe);
1250         if (p2 == NULL) {
1251                 return NT_STATUS_NO_MEMORY;
1252         }
1253         p2->conn = talloc_reference(p2, p->conn);
1254
1255         p2->context_id = ++p->conn->next_context_id;
1256
1257         status = GUID_from_string(pipe_uuid, &p2->syntax.uuid);
1258         if (!NT_STATUS_IS_OK(status)) {
1259                 talloc_free(p2);
1260                 return status;
1261         }
1262         p2->syntax.if_version = pipe_version;
1263
1264         status = GUID_from_string(NDR_GUID, &p2->transfer_syntax.uuid);
1265         if (!NT_STATUS_IS_OK(status)) {
1266                 talloc_free(p2);
1267                 return status;
1268         }
1269         p2->transfer_syntax.if_version = NDR_GUID_VERSION;
1270
1271         status = dcerpc_alter_context(p2, p2, &p2->syntax, &p2->transfer_syntax);
1272         if (!NT_STATUS_IS_OK(status)) {
1273                 talloc_free(p2);
1274                 return status;
1275         }
1276
1277         *pp2 = p2;
1278
1279         return status;
1280 }