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samba-mirror/source3/smbd/smb2_ioctl.c
David Disseldorp 5e278a5264 smb2_ioctl: fix truncated FSCTL_QUERY_ALLOCATED_RANGES responses
As per MS-FSA 2.1.5.10.22 FSCTL_QUERY_ALLOCATED_RANGES, if response
range entries exceed in_max_output, then we should respond with
STATUS_BUFFER_OVERFLOW and a truncated output buffer.

Bug: https://bugzilla.samba.org/show_bug.cgi?id=15699

Reported-by: David Howells <dhowells@redhat.com>
Signed-off-by: David Disseldorp <ddiss@samba.org>
Reviewed-by: Noel Power <npower@samba.org>

Autobuild-User(master): David Disseldorp <ddiss@samba.org>
Autobuild-Date(master): Wed Aug 28 08:54:11 UTC 2024 on atb-devel-224
2024-08-28 08:54:11 +00:00

508 lines
15 KiB
C

/*
Unix SMB/CIFS implementation.
Core SMB2 server
Copyright (C) Stefan Metzmacher 2009
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 "smbd/smbd.h"
#include "smbd/globals.h"
#include "../libcli/smb/smb_common.h"
#include "../lib/util/tevent_ntstatus.h"
#include "include/ntioctl.h"
#include "smb2_ioctl_private.h"
#include "librpc/gen_ndr/ioctl.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_SMB2
static struct tevent_req *smbd_smb2_ioctl_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct smbd_smb2_request *smb2req,
struct files_struct *in_fsp,
uint32_t in_ctl_code,
DATA_BLOB in_input,
uint32_t in_max_output,
uint32_t in_flags);
static NTSTATUS smbd_smb2_ioctl_recv(struct tevent_req *req,
TALLOC_CTX *mem_ctx,
DATA_BLOB *out_output,
uint8_t *body_padding,
bool *disconnect);
static void smbd_smb2_request_ioctl_done(struct tevent_req *subreq);
NTSTATUS smbd_smb2_request_process_ioctl(struct smbd_smb2_request *req)
{
NTSTATUS status;
const uint8_t *inbody;
uint32_t min_buffer_offset;
uint32_t max_buffer_offset;
uint32_t min_output_offset;
uint32_t allowed_length_in;
uint32_t allowed_length_out;
uint32_t in_ctl_code;
uint64_t in_file_id_persistent;
uint64_t in_file_id_volatile;
struct files_struct *in_fsp = NULL;
uint32_t in_input_offset;
uint32_t in_input_length;
DATA_BLOB in_input_buffer = data_blob_null;
uint32_t in_max_input_length;
uint32_t in_output_offset;
uint32_t in_output_length;
DATA_BLOB in_output_buffer = data_blob_null;
uint32_t in_max_output_length;
uint32_t in_flags;
uint32_t data_length_in;
uint32_t data_length_out;
uint32_t data_length_tmp;
uint32_t data_length_max;
struct tevent_req *subreq;
status = smbd_smb2_request_verify_sizes(req, 0x39);
if (!NT_STATUS_IS_OK(status)) {
return smbd_smb2_request_error(req, status);
}
inbody = SMBD_SMB2_IN_BODY_PTR(req);
in_ctl_code = IVAL(inbody, 0x04);
in_file_id_persistent = BVAL(inbody, 0x08);
in_file_id_volatile = BVAL(inbody, 0x10);
in_input_offset = IVAL(inbody, 0x18);
in_input_length = IVAL(inbody, 0x1C);
in_max_input_length = IVAL(inbody, 0x20);
in_output_offset = IVAL(inbody, 0x24);
in_output_length = IVAL(inbody, 0x28);
in_max_output_length = IVAL(inbody, 0x2C);
in_flags = IVAL(inbody, 0x30);
min_buffer_offset = SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN(req);
max_buffer_offset = min_buffer_offset + SMBD_SMB2_IN_DYN_LEN(req);
min_output_offset = min_buffer_offset;
/*
* InputOffset (4 bytes): The offset, in bytes, from the beginning of
* the SMB2 header to the input data buffer. If no input data is
* required for the FSCTL/IOCTL command being issued, the client SHOULD
* set this value to 0.<49>
* <49> If no input data is required for the FSCTL/IOCTL command being
* issued, Windows-based clients set this field to any value.
*/
allowed_length_in = 0;
if ((in_input_offset > 0) && (in_input_length > 0)) {
uint32_t tmp_ofs;
if (in_input_offset < min_buffer_offset) {
return smbd_smb2_request_error(req,
NT_STATUS_INVALID_PARAMETER);
}
if (in_input_offset > max_buffer_offset) {
return smbd_smb2_request_error(req,
NT_STATUS_INVALID_PARAMETER);
}
allowed_length_in = max_buffer_offset - in_input_offset;
tmp_ofs = in_input_offset - min_buffer_offset;
in_input_buffer.data = SMBD_SMB2_IN_DYN_PTR(req);
in_input_buffer.data += tmp_ofs;
in_input_buffer.length = in_input_length;
min_output_offset += tmp_ofs;
min_output_offset += in_input_length;
}
if (in_input_length > allowed_length_in) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
allowed_length_out = 0;
if (in_output_offset > 0) {
if (in_output_offset < min_buffer_offset) {
return smbd_smb2_request_error(req,
NT_STATUS_INVALID_PARAMETER);
}
if (in_output_offset > max_buffer_offset) {
return smbd_smb2_request_error(req,
NT_STATUS_INVALID_PARAMETER);
}
allowed_length_out = max_buffer_offset - in_output_offset;
}
if (in_output_length > allowed_length_out) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
if (in_output_length > 0) {
uint32_t tmp_ofs;
if (in_output_offset < min_output_offset) {
return smbd_smb2_request_error(req,
NT_STATUS_INVALID_PARAMETER);
}
tmp_ofs = in_output_offset - min_buffer_offset;
in_output_buffer.data = SMBD_SMB2_IN_DYN_PTR(req);
in_output_buffer.data += tmp_ofs;
in_output_buffer.length = in_output_length;
}
/*
* verify the credits and avoid overflows
* in_input_buffer.length and in_output_buffer.length
* are already verified.
*/
data_length_in = in_input_buffer.length + in_output_buffer.length;
data_length_out = in_max_input_length;
data_length_tmp = UINT32_MAX - data_length_out;
if (data_length_tmp < in_max_output_length) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
data_length_out += in_max_output_length;
data_length_max = MAX(data_length_in, data_length_out);
status = smbd_smb2_request_verify_creditcharge(req, data_length_max);
if (!NT_STATUS_IS_OK(status)) {
return smbd_smb2_request_error(req, status);
}
/*
* If the Flags field of the request is not SMB2_0_IOCTL_IS_FSCTL the
* server MUST fail the request with STATUS_NOT_SUPPORTED.
*/
if (in_flags != SMB2_IOCTL_FLAG_IS_FSCTL) {
return smbd_smb2_request_error(req, NT_STATUS_NOT_SUPPORTED);
}
switch (in_ctl_code) {
case FSCTL_DFS_GET_REFERRALS:
case FSCTL_DFS_GET_REFERRALS_EX:
case FSCTL_PIPE_WAIT:
case FSCTL_VALIDATE_NEGOTIATE_INFO_224:
case FSCTL_VALIDATE_NEGOTIATE_INFO:
case FSCTL_QUERY_NETWORK_INTERFACE_INFO:
case FSCTL_SMBTORTURE_FORCE_UNACKED_TIMEOUT:
case FSCTL_SMBTORTURE_IOCTL_RESPONSE_BODY_PADDING8:
case FSCTL_SMBTORTURE_GLOBAL_READ_RESPONSE_BODY_PADDING8:
/*
* Some SMB2 specific CtlCodes like FSCTL_DFS_GET_REFERRALS or
* FSCTL_PIPE_WAIT does not take a file handle.
*
* If FileId in the SMB2 Header of the request is not
* 0xFFFFFFFFFFFFFFFF, then the server MUST fail the request
* with STATUS_INVALID_PARAMETER.
*/
if (in_file_id_persistent != UINT64_MAX ||
in_file_id_volatile != UINT64_MAX) {
return smbd_smb2_request_error(req,
NT_STATUS_INVALID_PARAMETER);
}
break;
default:
in_fsp = file_fsp_smb2(req, in_file_id_persistent,
in_file_id_volatile);
if (in_fsp == NULL) {
return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
}
break;
}
subreq = smbd_smb2_ioctl_send(req, req->sconn->ev_ctx,
req, in_fsp,
in_ctl_code,
in_input_buffer,
in_max_output_length,
in_flags);
if (subreq == NULL) {
return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
}
/*
* If the FSCTL has gone async on a file handle, remember
* to add it to the list of async requests we need to wait
* for on file handle close.
*/
if (in_fsp != NULL && tevent_req_is_in_progress(subreq)) {
bool ok;
ok = aio_add_req_to_fsp(in_fsp, subreq);
if (!ok) {
return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
}
}
tevent_req_set_callback(subreq, smbd_smb2_request_ioctl_done, req);
return smbd_smb2_request_pending_queue(req, subreq, 1000);
}
/*
* 3.3.4.4 Sending an Error Response
* An error code other than one of the following indicates a failure:
*/
static bool smbd_smb2_ioctl_is_failure(uint32_t ctl_code, NTSTATUS status,
size_t data_size)
{
if (NT_STATUS_IS_OK(status)) {
return false;
}
/*
* STATUS_BUFFER_OVERFLOW in a FSCTL_PIPE_TRANSCEIVE, FSCTL_PIPE_PEEK or
* FSCTL_DFS_GET_REFERRALS Response specified in section 2.2.32.<153>
*/
if (NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)
&& ((ctl_code == FSCTL_PIPE_TRANSCEIVE)
|| (ctl_code == FSCTL_PIPE_PEEK)
|| (ctl_code == FSCTL_DFS_GET_REFERRALS)
|| (ctl_code == FSCTL_QUERY_ALLOCATED_RANGES))) {
return false;
}
/*
* Any status other than STATUS_SUCCESS in a FSCTL_SRV_COPYCHUNK or
* FSCTL_SRV_COPYCHUNK_WRITE Response, when returning an
* SRV_COPYCHUNK_RESPONSE as described in section 2.2.32.1.
*/
if (((ctl_code == FSCTL_SRV_COPYCHUNK)
|| (ctl_code == FSCTL_SRV_COPYCHUNK_WRITE))
&& (data_size == sizeof(struct srv_copychunk_rsp))) {
return false;
}
return true;
}
static void smbd_smb2_request_ioctl_done(struct tevent_req *subreq)
{
struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
struct smbd_smb2_request);
const uint8_t *inbody;
DATA_BLOB outbody;
DATA_BLOB outdyn;
uint32_t in_ctl_code;
uint64_t in_file_id_persistent;
uint64_t in_file_id_volatile;
uint32_t in_max_output_length;
uint32_t out_input_offset;
uint32_t out_output_offset;
DATA_BLOB out_output_buffer = data_blob_null;
NTSTATUS status;
NTSTATUS error; /* transport error */
bool disconnect = false;
uint16_t body_size;
uint8_t body_padding = 0;
status = smbd_smb2_ioctl_recv(subreq, req,
&out_output_buffer,
&body_padding,
&disconnect);
DEBUG(10,("smbd_smb2_request_ioctl_done: smbd_smb2_ioctl_recv returned "
"%u status %s\n",
(unsigned int)out_output_buffer.length,
nt_errstr(status) ));
TALLOC_FREE(subreq);
if (disconnect) {
error = status;
smbd_server_connection_terminate(req->xconn,
nt_errstr(error));
return;
}
inbody = SMBD_SMB2_IN_BODY_PTR(req);
in_ctl_code = IVAL(inbody, 0x04);
in_file_id_persistent = BVAL(inbody, 0x08);
in_file_id_volatile = BVAL(inbody, 0x10);
in_max_output_length = IVAL(inbody, 0x2C);
if (out_output_buffer.length > in_max_output_length) {
/*
* Return NT_STATUS_BUFFER_TOO_SMALL by
* default if the provided buffer doesn't
* fit.
*
* If someone wants truncated data
* together with STATUS_BUFFER_OVERFLOW
* it needs to be done explicitly in
* the backends. We currently do that
* in:
* - fsctl_dfs_get_refers()
* - smbd_smb2_ioctl_pipe_read_done()
* - fsctl_qar()
*/
status = NT_STATUS_BUFFER_TOO_SMALL;
}
if (smbd_smb2_ioctl_is_failure(in_ctl_code, status,
out_output_buffer.length)) {
error = smbd_smb2_request_error(req, status);
if (!NT_STATUS_IS_OK(error)) {
smbd_server_connection_terminate(req->xconn,
nt_errstr(error));
return;
}
return;
}
/*
* Only FSCTL_SMBTORTURE_IOCTL_RESPONSE_BODY_PADDING8
* sets body_padding to a value different from 0.
*/
body_size = 0x30 + body_padding;
out_input_offset = SMB2_HDR_BODY + body_size;
out_output_offset = SMB2_HDR_BODY + body_size;
outbody = smbd_smb2_generate_outbody(req, body_size);
if (outbody.data == NULL) {
error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
if (!NT_STATUS_IS_OK(error)) {
smbd_server_connection_terminate(req->xconn,
nt_errstr(error));
return;
}
return;
}
SSVAL(outbody.data, 0x00, 0x30 + 1); /* struct size */
SSVAL(outbody.data, 0x02, 0); /* reserved */
SIVAL(outbody.data, 0x04,
in_ctl_code); /* ctl code */
SBVAL(outbody.data, 0x08,
in_file_id_persistent); /* file id (persistent) */
SBVAL(outbody.data, 0x10,
in_file_id_volatile); /* file id (volatile) */
SIVAL(outbody.data, 0x18,
out_input_offset); /* input offset */
SIVAL(outbody.data, 0x1C, 0); /* input count */
SIVAL(outbody.data, 0x20,
out_output_offset); /* output offset */
SIVAL(outbody.data, 0x24,
out_output_buffer.length); /* output count */
SIVAL(outbody.data, 0x28, 0); /* flags */
SIVAL(outbody.data, 0x2C, 0); /* reserved */
if (body_padding != 0) {
memset(outbody.data + 0x30, 0, body_padding);
}
/*
* Note: Windows Vista and 2008 send back also the
* input from the request. But it was fixed in
* Windows 7.
*/
outdyn = out_output_buffer;
error = smbd_smb2_request_done_ex(req, status, outbody, &outdyn,
__location__);
if (!NT_STATUS_IS_OK(error)) {
smbd_server_connection_terminate(req->xconn,
nt_errstr(error));
return;
}
}
static struct tevent_req *smbd_smb2_ioctl_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct smbd_smb2_request *smb2req,
struct files_struct *fsp,
uint32_t in_ctl_code,
DATA_BLOB in_input,
uint32_t in_max_output,
uint32_t in_flags)
{
struct tevent_req *req;
struct smbd_smb2_ioctl_state *state;
struct smb_request *smbreq;
req = tevent_req_create(mem_ctx, &state,
struct smbd_smb2_ioctl_state);
if (req == NULL) {
return NULL;
}
state->smb2req = smb2req;
state->smbreq = NULL;
state->fsp = fsp;
state->in_input = in_input;
state->in_max_output = in_max_output;
state->out_output = data_blob_null;
DEBUG(10, ("smbd_smb2_ioctl: ctl_code[0x%08x] %s, %s\n",
(unsigned)in_ctl_code,
fsp ? fsp_str_dbg(fsp) : "<no handle>",
fsp_fnum_dbg(fsp)));
smbreq = smbd_smb2_fake_smb_request(smb2req, fsp);
if (tevent_req_nomem(smbreq, req)) {
return tevent_req_post(req, ev);
}
state->smbreq = smbreq;
switch (in_ctl_code & IOCTL_DEV_TYPE_MASK) {
case FSCTL_DFS:
return smb2_ioctl_dfs(in_ctl_code, ev, req, state);
case FSCTL_FILESYSTEM:
return smb2_ioctl_filesys(in_ctl_code, ev, req, state);
case FSCTL_NAMED_PIPE:
return smb2_ioctl_named_pipe(in_ctl_code, ev, req, state);
case FSCTL_NETWORK_FILESYSTEM:
return smb2_ioctl_network_fs(in_ctl_code, ev, req, state);
case FSCTL_SMBTORTURE:
return smb2_ioctl_smbtorture(in_ctl_code, ev, req, state);
default:
if (IS_IPC(smbreq->conn)) {
tevent_req_nterror(req, NT_STATUS_FS_DRIVER_REQUIRED);
} else {
tevent_req_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
}
return tevent_req_post(req, ev);
}
}
static NTSTATUS smbd_smb2_ioctl_recv(struct tevent_req *req,
TALLOC_CTX *mem_ctx,
DATA_BLOB *out_output,
uint8_t *body_padding,
bool *disconnect)
{
NTSTATUS status = NT_STATUS_OK;
struct smbd_smb2_ioctl_state *state = tevent_req_data(req,
struct smbd_smb2_ioctl_state);
enum tevent_req_state req_state;
uint64_t err;
*body_padding = state->body_padding;
*disconnect = state->disconnect;
if ((tevent_req_is_error(req, &req_state, &err) == false)
|| (req_state == TEVENT_REQ_USER_ERROR)) {
/*
* Return output buffer to caller if the ioctl was successfully
* processed, even if a user error occurred. Some ioctls return
* data on failure.
*/
*out_output = state->out_output;
talloc_steal(mem_ctx, out_output->data);
}
tevent_req_is_nterror(req, &status);
tevent_req_received(req);
return status;
}