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/*
* DCERPC Helper routines
* Günther Deschner <gd@samba.org> 2010.
* Simo Sorce <idra@samba.org> 2010.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "librpc/rpc/dcerpc.h"
#include "librpc/gen_ndr/ndr_dcerpc.h"
#include "librpc/gen_ndr/ndr_schannel.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_RPC_PARSE
/**
* @brief NDR Encodes a ncacn_packet
*
* @param mem_ctx The memory context the blob will be allocated on
* @param ptype The DCERPC packet type
* @param pfc_flags The DCERPC PFC Falgs
* @param auth_length The length of the trailing auth blob
* @param call_id The call ID
* @param u The payload of the packet
* @param blob [out] The encoded blob if successful
*
* @return an NTSTATUS error code
*/
NTSTATUS dcerpc_push_ncacn_packet(TALLOC_CTX *mem_ctx,
enum dcerpc_pkt_type ptype,
uint8_t pfc_flags,
uint16_t auth_length,
uint32_t call_id,
union dcerpc_payload *u,
DATA_BLOB *blob)
{
struct ncacn_packet r;
enum ndr_err_code ndr_err;
r.rpc_vers = 5;
r.rpc_vers_minor = 0;
r.ptype = ptype;
r.pfc_flags = pfc_flags;
r.drep[0] = DCERPC_DREP_LE;
r.drep[1] = 0;
r.drep[2] = 0;
r.drep[3] = 0;
r.auth_length = auth_length;
r.call_id = call_id;
r.u = *u;
ndr_err = ndr_push_struct_blob(blob, mem_ctx, &r,
(ndr_push_flags_fn_t)ndr_push_ncacn_packet);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
return ndr_map_error2ntstatus(ndr_err);
}
dcerpc_set_frag_length(blob, blob->length);
if (DEBUGLEVEL >= 10) {
/* set frag len for print function */
r.frag_length = blob->length;
NDR_PRINT_DEBUG(ncacn_packet, &r);
}
return NT_STATUS_OK;
}
/**
* @brief Decodes a ncacn_packet
*
* @param mem_ctx The memory context on which to allocate the packet
* elements
* @param blob The blob of data to decode
* @param r An empty ncacn_packet, must not be NULL
*
* @return a NTSTATUS error code
*/
NTSTATUS dcerpc_pull_ncacn_packet(TALLOC_CTX *mem_ctx,
const DATA_BLOB *blob,
struct ncacn_packet *r,
bool bigendian)
{
enum ndr_err_code ndr_err;
struct ndr_pull *ndr;
ndr = ndr_pull_init_blob(blob, mem_ctx);
if (!ndr) {
return NT_STATUS_NO_MEMORY;
}
if (bigendian) {
ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
}
ndr_err = ndr_pull_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, r);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
talloc_free(ndr);
return ndr_map_error2ntstatus(ndr_err);
}
talloc_free(ndr);
if (DEBUGLEVEL >= 10) {
NDR_PRINT_DEBUG(ncacn_packet, r);
}
return NT_STATUS_OK;
}
/**
* @brief NDR Encodes a NL_AUTH_MESSAGE
*
* @param mem_ctx The memory context the blob will be allocated on
* @param r The NL_AUTH_MESSAGE to encode
* @param blob [out] The encoded blob if successful
*
* @return a NTSTATUS error code
*/
NTSTATUS dcerpc_push_schannel_bind(TALLOC_CTX *mem_ctx,
struct NL_AUTH_MESSAGE *r,
DATA_BLOB *blob)
{
enum ndr_err_code ndr_err;
ndr_err = ndr_push_struct_blob(blob, mem_ctx, r,
(ndr_push_flags_fn_t)ndr_push_NL_AUTH_MESSAGE);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
return ndr_map_error2ntstatus(ndr_err);
}
if (DEBUGLEVEL >= 10) {
NDR_PRINT_DEBUG(NL_AUTH_MESSAGE, r);
}
return NT_STATUS_OK;
}
/**
* @brief NDR Encodes a dcerpc_auth structure
*
* @param mem_ctx The memory context the blob will be allocated on
* @param auth_type The DCERPC Authentication Type
* @param auth_level The DCERPC Authentication Level
* @param auth_pad_length The padding added to the packet this blob will be
* appended to.
* @param auth_context_id The context id
* @param credentials The authentication credentials blob (signature)
* @param blob [out] The encoded blob if successful
*
* @return a NTSTATUS error code
*/
NTSTATUS dcerpc_push_dcerpc_auth(TALLOC_CTX *mem_ctx,
enum dcerpc_AuthType auth_type,
enum dcerpc_AuthLevel auth_level,
uint8_t auth_pad_length,
uint32_t auth_context_id,
const DATA_BLOB *credentials,
DATA_BLOB *blob)
{
struct dcerpc_auth r;
enum ndr_err_code ndr_err;
r.auth_type = auth_type;
r.auth_level = auth_level;
r.auth_pad_length = auth_pad_length;
r.auth_reserved = 0;
r.auth_context_id = auth_context_id;
r.credentials = *credentials;
ndr_err = ndr_push_struct_blob(blob, mem_ctx, &r,
(ndr_push_flags_fn_t)ndr_push_dcerpc_auth);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
return ndr_map_error2ntstatus(ndr_err);
}
if (DEBUGLEVEL >= 10) {
NDR_PRINT_DEBUG(dcerpc_auth, &r);
}
return NT_STATUS_OK;
}
/**
* @brief Decodes a dcerpc_auth blob
*
* @param mem_ctx The memory context on which to allocate the packet
* elements
* @param blob The blob of data to decode
* @param r An empty dcerpc_auth structure, must not be NULL
*
* @return a NTSTATUS error code
*/
NTSTATUS dcerpc_pull_dcerpc_auth(TALLOC_CTX *mem_ctx,
const DATA_BLOB *blob,
struct dcerpc_auth *r,
bool bigendian)
{
enum ndr_err_code ndr_err;
struct ndr_pull *ndr;
ndr = ndr_pull_init_blob(blob, mem_ctx);
if (!ndr) {
return NT_STATUS_NO_MEMORY;
}
if (bigendian) {
ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
}
ndr_err = ndr_pull_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, r);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
talloc_free(ndr);
return ndr_map_error2ntstatus(ndr_err);
}
talloc_free(ndr);
if (DEBUGLEVEL >= 10) {
NDR_PRINT_DEBUG(dcerpc_auth, r);
}
return NT_STATUS_OK;
}
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