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2b4672f2d3
Signed-off-by: Stefan Metzmacher <metze@samba.org> Autobuild-User(master): Stefan Metzmacher <metze@samba.org> Autobuild-Date(master): Sat Oct 27 10:05:22 CEST 2012 on sn-devel-104
225 lines
5.5 KiB
C
225 lines
5.5 KiB
C
/*
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Unix SMB/CIFS implementation.
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SMB2 Create Context Blob handling
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Copyright (C) Andrew Tridgell 2005
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Copyright (C) Stefan Metzmacher 2008-2009
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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 "../libcli/smb/smb_common.h"
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static size_t smb2_create_blob_padding(uint32_t offset, size_t n)
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{
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if ((offset & (n-1)) == 0) return 0;
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return n - (offset & (n-1));
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}
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/*
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parse a set of SMB2 create blobs
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*/
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NTSTATUS smb2_create_blob_parse(TALLOC_CTX *mem_ctx, const DATA_BLOB buffer,
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struct smb2_create_blobs *blobs)
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{
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const uint8_t *data = buffer.data;
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uint32_t remaining = buffer.length;
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while (remaining > 0) {
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uint32_t next;
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uint32_t name_offset, name_length;
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uint32_t data_offset;
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uint32_t data_length;
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char *tag;
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DATA_BLOB b;
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NTSTATUS status;
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if (remaining < 16) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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next = IVAL(data, 0);
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name_offset = SVAL(data, 4);
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name_length = SVAL(data, 6);
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#if 0
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reserved = SVAL(data, 8);
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#endif
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data_offset = SVAL(data, 10);
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data_length = IVAL(data, 12);
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if ((next & 0x7) != 0 ||
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next > remaining ||
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name_offset != 16 ||
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name_length < 4 ||
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name_offset + name_length > remaining ||
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(data_offset & 0x7) != 0 ||
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(data_offset && (data_offset < name_offset + name_length)) ||
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(data_offset > remaining) ||
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(data_offset + (uint64_t)data_length > remaining)) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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tag = talloc_strndup(mem_ctx, (const char *)data + name_offset, name_length);
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if (tag == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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b = data_blob_const(data+data_offset, data_length);
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status = smb2_create_blob_add(mem_ctx, blobs, tag, b);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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talloc_free(tag);
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if (next == 0) break;
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remaining -= next;
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data += next;
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if (remaining < 16) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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}
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return NT_STATUS_OK;
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}
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/*
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add a blob to a smb2_create attribute blob
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*/
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static NTSTATUS smb2_create_blob_push_one(TALLOC_CTX *mem_ctx, DATA_BLOB *buffer,
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const struct smb2_create_blob *blob,
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bool last)
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{
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uint32_t ofs = buffer->length;
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size_t tag_length = strlen(blob->tag);
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size_t blob_offset = 0;
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size_t blob_pad = 0;
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size_t next_offset = 0;
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size_t next_pad = 0;
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bool ok;
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blob_offset = 0x10 + tag_length;
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blob_pad = smb2_create_blob_padding(blob_offset, 8);
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next_offset = blob_offset + blob_pad + blob->data.length;
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if (!last) {
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next_pad = smb2_create_blob_padding(next_offset, 8);
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}
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ok = data_blob_realloc(mem_ctx, buffer,
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buffer->length + next_offset + next_pad);
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if (!ok) {
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return NT_STATUS_NO_MEMORY;
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}
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if (last) {
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SIVAL(buffer->data, ofs+0x00, 0);
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} else {
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SIVAL(buffer->data, ofs+0x00, next_offset + next_pad);
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}
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SSVAL(buffer->data, ofs+0x04, 0x10); /* offset of tag */
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SIVAL(buffer->data, ofs+0x06, tag_length); /* tag length */
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SSVAL(buffer->data, ofs+0x0A, blob_offset + blob_pad); /* offset of data */
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SIVAL(buffer->data, ofs+0x0C, blob->data.length);
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memcpy(buffer->data+ofs+0x10, blob->tag, tag_length);
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if (blob_pad > 0) {
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memset(buffer->data+ofs+blob_offset, 0, blob_pad);
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blob_offset += blob_pad;
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}
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memcpy(buffer->data+ofs+blob_offset, blob->data.data, blob->data.length);
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if (next_pad > 0) {
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memset(buffer->data+ofs+next_offset, 0, next_pad);
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next_offset += next_pad;
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}
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return NT_STATUS_OK;
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}
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/*
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create a buffer of a set of create blobs
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*/
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NTSTATUS smb2_create_blob_push(TALLOC_CTX *mem_ctx, DATA_BLOB *buffer,
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const struct smb2_create_blobs blobs)
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{
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int i;
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NTSTATUS status;
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*buffer = data_blob(NULL, 0);
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for (i=0; i < blobs.num_blobs; i++) {
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bool last = false;
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const struct smb2_create_blob *c;
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if ((i + 1) == blobs.num_blobs) {
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last = true;
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}
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c = &blobs.blobs[i];
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status = smb2_create_blob_push_one(mem_ctx, buffer, c, last);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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}
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return NT_STATUS_OK;
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}
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NTSTATUS smb2_create_blob_add(TALLOC_CTX *mem_ctx, struct smb2_create_blobs *b,
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const char *tag, DATA_BLOB data)
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{
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struct smb2_create_blob *array;
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array = talloc_realloc(mem_ctx, b->blobs,
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struct smb2_create_blob,
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b->num_blobs + 1);
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NT_STATUS_HAVE_NO_MEMORY(array);
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b->blobs = array;
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b->blobs[b->num_blobs].tag = talloc_strdup(b->blobs, tag);
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NT_STATUS_HAVE_NO_MEMORY(b->blobs[b->num_blobs].tag);
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if (data.data) {
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b->blobs[b->num_blobs].data = data_blob_talloc(b->blobs,
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data.data,
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data.length);
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NT_STATUS_HAVE_NO_MEMORY(b->blobs[b->num_blobs].data.data);
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} else {
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b->blobs[b->num_blobs].data = data_blob_null;
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}
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b->num_blobs += 1;
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return NT_STATUS_OK;
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}
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/*
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* return the first blob with the given tag
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*/
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struct smb2_create_blob *smb2_create_blob_find(const struct smb2_create_blobs *b,
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const char *tag)
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{
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uint32_t i;
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for (i=0; i < b->num_blobs; i++) {
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if (strcmp(b->blobs[i].tag, tag) == 0) {
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return &b->blobs[i];
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}
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}
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return NULL;
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}
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