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https://github.com/samba-team/samba.git
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e340aa40d1
Signed-off-by: Günther Deschner <gd@samba.org>
118 lines
3.3 KiB
C
118 lines
3.3 KiB
C
/*
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Unix SMB/CIFS implementation.
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raw dcerpc operations
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Copyright (C) Andrew Tridgell 2003-2005
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Copyright (C) Jelmer Vernooij 2004-2005
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "librpc/rpc/dcerpc.h"
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#include "librpc/gen_ndr/ndr_dcerpc.h"
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/* we need to be able to get/set the fragment length without doing a full
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decode */
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void dcerpc_set_frag_length(DATA_BLOB *blob, uint16_t v)
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{
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if (CVAL(blob->data,DCERPC_DREP_OFFSET) & DCERPC_DREP_LE) {
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SSVAL(blob->data, DCERPC_FRAG_LEN_OFFSET, v);
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} else {
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RSSVAL(blob->data, DCERPC_FRAG_LEN_OFFSET, v);
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}
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}
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uint16_t dcerpc_get_frag_length(const DATA_BLOB *blob)
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{
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if (CVAL(blob->data,DCERPC_DREP_OFFSET) & DCERPC_DREP_LE) {
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return SVAL(blob->data, DCERPC_FRAG_LEN_OFFSET);
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} else {
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return RSVAL(blob->data, DCERPC_FRAG_LEN_OFFSET);
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}
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}
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void dcerpc_set_auth_length(DATA_BLOB *blob, uint16_t v)
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{
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if (CVAL(blob->data,DCERPC_DREP_OFFSET) & DCERPC_DREP_LE) {
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SSVAL(blob->data, DCERPC_AUTH_LEN_OFFSET, v);
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} else {
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RSSVAL(blob->data, DCERPC_AUTH_LEN_OFFSET, v);
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}
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}
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/*
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pull an dcerpc_auth structure, taking account of any auth padding in
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the blob at the end of the structure
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*/
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NTSTATUS dcerpc_pull_auth_trailer(struct ncacn_packet *pkt,
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TALLOC_CTX *mem_ctx,
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DATA_BLOB *pkt_auth_blob,
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struct dcerpc_auth *auth,
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uint32_t *auth_length,
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bool check_pad)
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{
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struct ndr_pull *ndr;
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enum ndr_err_code ndr_err;
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uint32_t pad;
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pad = pkt_auth_blob->length - (DCERPC_AUTH_TRAILER_LENGTH + pkt->auth_length);
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/* paranoia check for pad size. This would be caught anyway by
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the ndr_pull_advance() a few lines down, but it scared
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Jeremy enough for him to call me, so we might as well check
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it now, just to prevent someone posting a bogus YouTube
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video in the future.
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*/
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if (pad > pkt_auth_blob->length) {
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return NT_STATUS_INFO_LENGTH_MISMATCH;
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}
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*auth_length = pkt_auth_blob->length - pad;
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ndr = ndr_pull_init_blob(pkt_auth_blob, mem_ctx);
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if (!ndr) {
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return NT_STATUS_NO_MEMORY;
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}
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if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
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ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
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}
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ndr_err = ndr_pull_advance(ndr, pad);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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talloc_free(ndr);
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return ndr_map_error2ntstatus(ndr_err);
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}
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ndr_err = ndr_pull_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, auth);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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talloc_free(ndr);
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return ndr_map_error2ntstatus(ndr_err);
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}
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if (check_pad && pad != auth->auth_pad_length) {
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DEBUG(1,(__location__ ": WARNING: pad length mismatch. Calculated %u got %u\n",
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(unsigned)pad, (unsigned)auth->auth_pad_length));
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}
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DEBUG(6,(__location__ ": auth_pad_length %u\n",
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(unsigned)auth->auth_pad_length));
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talloc_steal(mem_ctx, auth->credentials.data);
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talloc_free(ndr);
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return NT_STATUS_OK;
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}
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