445 строки
13 KiB
C
445 строки
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
|
|
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
|
|
*/
|
|
|
|
#include "glob.h"
|
|
#include "nterr.h"
|
|
#include "smb_common.h"
|
|
#include "smbstatus.h"
|
|
#include "mgmt/user_session.h"
|
|
#include "connection.h"
|
|
|
|
static int check_smb2_hdr(struct smb2_hdr *hdr)
|
|
{
|
|
/*
|
|
* Make sure that this really is an SMB, that it is a response.
|
|
*/
|
|
if (hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The following table defines the expected "StructureSize" of SMB2 requests
|
|
* in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests.
|
|
*
|
|
* Note that commands are defined in smb2pdu.h in le16 but the array below is
|
|
* indexed by command in host byte order
|
|
*/
|
|
static const __le16 smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
|
|
/* SMB2_NEGOTIATE */ cpu_to_le16(36),
|
|
/* SMB2_SESSION_SETUP */ cpu_to_le16(25),
|
|
/* SMB2_LOGOFF */ cpu_to_le16(4),
|
|
/* SMB2_TREE_CONNECT */ cpu_to_le16(9),
|
|
/* SMB2_TREE_DISCONNECT */ cpu_to_le16(4),
|
|
/* SMB2_CREATE */ cpu_to_le16(57),
|
|
/* SMB2_CLOSE */ cpu_to_le16(24),
|
|
/* SMB2_FLUSH */ cpu_to_le16(24),
|
|
/* SMB2_READ */ cpu_to_le16(49),
|
|
/* SMB2_WRITE */ cpu_to_le16(49),
|
|
/* SMB2_LOCK */ cpu_to_le16(48),
|
|
/* SMB2_IOCTL */ cpu_to_le16(57),
|
|
/* SMB2_CANCEL */ cpu_to_le16(4),
|
|
/* SMB2_ECHO */ cpu_to_le16(4),
|
|
/* SMB2_QUERY_DIRECTORY */ cpu_to_le16(33),
|
|
/* SMB2_CHANGE_NOTIFY */ cpu_to_le16(32),
|
|
/* SMB2_QUERY_INFO */ cpu_to_le16(41),
|
|
/* SMB2_SET_INFO */ cpu_to_le16(33),
|
|
/* use 44 for lease break */
|
|
/* SMB2_OPLOCK_BREAK */ cpu_to_le16(36)
|
|
};
|
|
|
|
/*
|
|
* The size of the variable area depends on the offset and length fields
|
|
* located in different fields for various SMB2 requests. SMB2 requests
|
|
* with no variable length info, show an offset of zero for the offset field.
|
|
*/
|
|
static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
|
|
/* SMB2_NEGOTIATE */ true,
|
|
/* SMB2_SESSION_SETUP */ true,
|
|
/* SMB2_LOGOFF */ false,
|
|
/* SMB2_TREE_CONNECT */ true,
|
|
/* SMB2_TREE_DISCONNECT */ false,
|
|
/* SMB2_CREATE */ true,
|
|
/* SMB2_CLOSE */ false,
|
|
/* SMB2_FLUSH */ false,
|
|
/* SMB2_READ */ true,
|
|
/* SMB2_WRITE */ true,
|
|
/* SMB2_LOCK */ true,
|
|
/* SMB2_IOCTL */ true,
|
|
/* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
|
|
/* SMB2_ECHO */ false,
|
|
/* SMB2_QUERY_DIRECTORY */ true,
|
|
/* SMB2_CHANGE_NOTIFY */ false,
|
|
/* SMB2_QUERY_INFO */ true,
|
|
/* SMB2_SET_INFO */ true,
|
|
/* SMB2_OPLOCK_BREAK */ false
|
|
};
|
|
|
|
/*
|
|
* Set length of the data area and the offset to arguments.
|
|
* if they are invalid, return error.
|
|
*/
|
|
static int smb2_get_data_area_len(unsigned int *off, unsigned int *len,
|
|
struct smb2_hdr *hdr)
|
|
{
|
|
int ret = 0;
|
|
|
|
*off = 0;
|
|
*len = 0;
|
|
|
|
/*
|
|
* Following commands have data areas so we have to get the location
|
|
* of the data buffer offset and data buffer length for the particular
|
|
* command.
|
|
*/
|
|
switch (hdr->Command) {
|
|
case SMB2_SESSION_SETUP:
|
|
*off = le16_to_cpu(((struct smb2_sess_setup_req *)hdr)->SecurityBufferOffset);
|
|
*len = le16_to_cpu(((struct smb2_sess_setup_req *)hdr)->SecurityBufferLength);
|
|
break;
|
|
case SMB2_TREE_CONNECT:
|
|
*off = le16_to_cpu(((struct smb2_tree_connect_req *)hdr)->PathOffset);
|
|
*len = le16_to_cpu(((struct smb2_tree_connect_req *)hdr)->PathLength);
|
|
break;
|
|
case SMB2_CREATE:
|
|
{
|
|
if (((struct smb2_create_req *)hdr)->CreateContextsLength) {
|
|
*off = le32_to_cpu(((struct smb2_create_req *)
|
|
hdr)->CreateContextsOffset);
|
|
*len = le32_to_cpu(((struct smb2_create_req *)
|
|
hdr)->CreateContextsLength);
|
|
break;
|
|
}
|
|
|
|
*off = le16_to_cpu(((struct smb2_create_req *)hdr)->NameOffset);
|
|
*len = le16_to_cpu(((struct smb2_create_req *)hdr)->NameLength);
|
|
break;
|
|
}
|
|
case SMB2_QUERY_INFO:
|
|
*off = le16_to_cpu(((struct smb2_query_info_req *)hdr)->InputBufferOffset);
|
|
*len = le32_to_cpu(((struct smb2_query_info_req *)hdr)->InputBufferLength);
|
|
break;
|
|
case SMB2_SET_INFO:
|
|
*off = le16_to_cpu(((struct smb2_set_info_req *)hdr)->BufferOffset);
|
|
*len = le32_to_cpu(((struct smb2_set_info_req *)hdr)->BufferLength);
|
|
break;
|
|
case SMB2_READ:
|
|
*off = le16_to_cpu(((struct smb2_read_req *)hdr)->ReadChannelInfoOffset);
|
|
*len = le16_to_cpu(((struct smb2_read_req *)hdr)->ReadChannelInfoLength);
|
|
break;
|
|
case SMB2_WRITE:
|
|
if (((struct smb2_write_req *)hdr)->DataOffset ||
|
|
((struct smb2_write_req *)hdr)->Length) {
|
|
*off = max_t(unsigned int,
|
|
le16_to_cpu(((struct smb2_write_req *)hdr)->DataOffset),
|
|
offsetof(struct smb2_write_req, Buffer));
|
|
*len = le32_to_cpu(((struct smb2_write_req *)hdr)->Length);
|
|
break;
|
|
}
|
|
|
|
*off = le16_to_cpu(((struct smb2_write_req *)hdr)->WriteChannelInfoOffset);
|
|
*len = le16_to_cpu(((struct smb2_write_req *)hdr)->WriteChannelInfoLength);
|
|
break;
|
|
case SMB2_QUERY_DIRECTORY:
|
|
*off = le16_to_cpu(((struct smb2_query_directory_req *)hdr)->FileNameOffset);
|
|
*len = le16_to_cpu(((struct smb2_query_directory_req *)hdr)->FileNameLength);
|
|
break;
|
|
case SMB2_LOCK:
|
|
{
|
|
unsigned short lock_count;
|
|
|
|
lock_count = le16_to_cpu(((struct smb2_lock_req *)hdr)->LockCount);
|
|
if (lock_count > 0) {
|
|
*off = offsetof(struct smb2_lock_req, locks);
|
|
*len = sizeof(struct smb2_lock_element) * lock_count;
|
|
}
|
|
break;
|
|
}
|
|
case SMB2_IOCTL:
|
|
*off = le32_to_cpu(((struct smb2_ioctl_req *)hdr)->InputOffset);
|
|
*len = le32_to_cpu(((struct smb2_ioctl_req *)hdr)->InputCount);
|
|
break;
|
|
default:
|
|
ksmbd_debug(SMB, "no length check for command\n");
|
|
break;
|
|
}
|
|
|
|
if (*off > 4096) {
|
|
ksmbd_debug(SMB, "offset %d too large\n", *off);
|
|
ret = -EINVAL;
|
|
} else if ((u64)*off + *len > MAX_STREAM_PROT_LEN) {
|
|
ksmbd_debug(SMB, "Request is larger than maximum stream protocol length(%u): %llu\n",
|
|
MAX_STREAM_PROT_LEN, (u64)*off + *len);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Calculate the size of the SMB message based on the fixed header
|
|
* portion, the number of word parameters and the data portion of the message.
|
|
*/
|
|
static int smb2_calc_size(void *buf, unsigned int *len)
|
|
{
|
|
struct smb2_pdu *pdu = (struct smb2_pdu *)buf;
|
|
struct smb2_hdr *hdr = &pdu->hdr;
|
|
unsigned int offset; /* the offset from the beginning of SMB to data area */
|
|
unsigned int data_length; /* the length of the variable length data area */
|
|
int ret;
|
|
|
|
/* Structure Size has already been checked to make sure it is 64 */
|
|
*len = le16_to_cpu(hdr->StructureSize);
|
|
|
|
/*
|
|
* StructureSize2, ie length of fixed parameter area has already
|
|
* been checked to make sure it is the correct length.
|
|
*/
|
|
*len += le16_to_cpu(pdu->StructureSize2);
|
|
/*
|
|
* StructureSize2 of smb2_lock pdu is set to 48, indicating
|
|
* the size of smb2 lock request with single smb2_lock_element
|
|
* regardless of number of locks. Subtract single
|
|
* smb2_lock_element for correct buffer size check.
|
|
*/
|
|
if (hdr->Command == SMB2_LOCK)
|
|
*len -= sizeof(struct smb2_lock_element);
|
|
|
|
if (has_smb2_data_area[le16_to_cpu(hdr->Command)] == false)
|
|
goto calc_size_exit;
|
|
|
|
ret = smb2_get_data_area_len(&offset, &data_length, hdr);
|
|
if (ret)
|
|
return ret;
|
|
ksmbd_debug(SMB, "SMB2 data length %u offset %u\n", data_length,
|
|
offset);
|
|
|
|
if (data_length > 0) {
|
|
/*
|
|
* Check to make sure that data area begins after fixed area,
|
|
* Note that last byte of the fixed area is part of data area
|
|
* for some commands, typically those with odd StructureSize,
|
|
* so we must add one to the calculation.
|
|
*/
|
|
if (offset + 1 < *len) {
|
|
ksmbd_debug(SMB,
|
|
"data area offset %d overlaps SMB2 header %u\n",
|
|
offset + 1, *len);
|
|
return -EINVAL;
|
|
}
|
|
|
|
*len = offset + data_length;
|
|
}
|
|
|
|
calc_size_exit:
|
|
ksmbd_debug(SMB, "SMB2 len %u\n", *len);
|
|
return 0;
|
|
}
|
|
|
|
static inline int smb2_query_info_req_len(struct smb2_query_info_req *h)
|
|
{
|
|
return le32_to_cpu(h->InputBufferLength) +
|
|
le32_to_cpu(h->OutputBufferLength);
|
|
}
|
|
|
|
static inline int smb2_set_info_req_len(struct smb2_set_info_req *h)
|
|
{
|
|
return le32_to_cpu(h->BufferLength);
|
|
}
|
|
|
|
static inline int smb2_read_req_len(struct smb2_read_req *h)
|
|
{
|
|
return le32_to_cpu(h->Length);
|
|
}
|
|
|
|
static inline int smb2_write_req_len(struct smb2_write_req *h)
|
|
{
|
|
return le32_to_cpu(h->Length);
|
|
}
|
|
|
|
static inline int smb2_query_dir_req_len(struct smb2_query_directory_req *h)
|
|
{
|
|
return le32_to_cpu(h->OutputBufferLength);
|
|
}
|
|
|
|
static inline int smb2_ioctl_req_len(struct smb2_ioctl_req *h)
|
|
{
|
|
return le32_to_cpu(h->InputCount) +
|
|
le32_to_cpu(h->OutputCount);
|
|
}
|
|
|
|
static inline int smb2_ioctl_resp_len(struct smb2_ioctl_req *h)
|
|
{
|
|
return le32_to_cpu(h->MaxInputResponse) +
|
|
le32_to_cpu(h->MaxOutputResponse);
|
|
}
|
|
|
|
static int smb2_validate_credit_charge(struct ksmbd_conn *conn,
|
|
struct smb2_hdr *hdr)
|
|
{
|
|
unsigned int req_len = 0, expect_resp_len = 0, calc_credit_num, max_len;
|
|
unsigned short credit_charge = le16_to_cpu(hdr->CreditCharge);
|
|
void *__hdr = hdr;
|
|
int ret = 0;
|
|
|
|
switch (hdr->Command) {
|
|
case SMB2_QUERY_INFO:
|
|
req_len = smb2_query_info_req_len(__hdr);
|
|
break;
|
|
case SMB2_SET_INFO:
|
|
req_len = smb2_set_info_req_len(__hdr);
|
|
break;
|
|
case SMB2_READ:
|
|
req_len = smb2_read_req_len(__hdr);
|
|
break;
|
|
case SMB2_WRITE:
|
|
req_len = smb2_write_req_len(__hdr);
|
|
break;
|
|
case SMB2_QUERY_DIRECTORY:
|
|
req_len = smb2_query_dir_req_len(__hdr);
|
|
break;
|
|
case SMB2_IOCTL:
|
|
req_len = smb2_ioctl_req_len(__hdr);
|
|
expect_resp_len = smb2_ioctl_resp_len(__hdr);
|
|
break;
|
|
case SMB2_CANCEL:
|
|
return 0;
|
|
default:
|
|
req_len = 1;
|
|
break;
|
|
}
|
|
|
|
credit_charge = max_t(unsigned short, credit_charge, 1);
|
|
max_len = max_t(unsigned int, req_len, expect_resp_len);
|
|
calc_credit_num = DIV_ROUND_UP(max_len, SMB2_MAX_BUFFER_SIZE);
|
|
|
|
if (credit_charge < calc_credit_num) {
|
|
ksmbd_debug(SMB, "Insufficient credit charge, given: %d, needed: %d\n",
|
|
credit_charge, calc_credit_num);
|
|
return 1;
|
|
} else if (credit_charge > conn->vals->max_credits) {
|
|
ksmbd_debug(SMB, "Too large credit charge: %d\n", credit_charge);
|
|
return 1;
|
|
}
|
|
|
|
spin_lock(&conn->credits_lock);
|
|
if (credit_charge > conn->total_credits) {
|
|
ksmbd_debug(SMB, "Insufficient credits granted, given: %u, granted: %u\n",
|
|
credit_charge, conn->total_credits);
|
|
ret = 1;
|
|
}
|
|
|
|
if ((u64)conn->outstanding_credits + credit_charge > conn->total_credits) {
|
|
ksmbd_debug(SMB, "Limits exceeding the maximum allowable outstanding requests, given : %u, pending : %u\n",
|
|
credit_charge, conn->outstanding_credits);
|
|
ret = 1;
|
|
} else
|
|
conn->outstanding_credits += credit_charge;
|
|
|
|
spin_unlock(&conn->credits_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ksmbd_smb2_check_message(struct ksmbd_work *work)
|
|
{
|
|
struct smb2_pdu *pdu = ksmbd_req_buf_next(work);
|
|
struct smb2_hdr *hdr = &pdu->hdr;
|
|
int command;
|
|
__u32 clc_len; /* calculated length */
|
|
__u32 len = get_rfc1002_len(work->request_buf);
|
|
|
|
if (le32_to_cpu(hdr->NextCommand) > 0)
|
|
len = le32_to_cpu(hdr->NextCommand);
|
|
else if (work->next_smb2_rcv_hdr_off)
|
|
len -= work->next_smb2_rcv_hdr_off;
|
|
|
|
if (check_smb2_hdr(hdr))
|
|
return 1;
|
|
|
|
if (hdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
|
|
ksmbd_debug(SMB, "Illegal structure size %u\n",
|
|
le16_to_cpu(hdr->StructureSize));
|
|
return 1;
|
|
}
|
|
|
|
command = le16_to_cpu(hdr->Command);
|
|
if (command >= NUMBER_OF_SMB2_COMMANDS) {
|
|
ksmbd_debug(SMB, "Illegal SMB2 command %d\n", command);
|
|
return 1;
|
|
}
|
|
|
|
if (smb2_req_struct_sizes[command] != pdu->StructureSize2) {
|
|
if (command != SMB2_OPLOCK_BREAK_HE &&
|
|
(hdr->Status == 0 || pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2_LE)) {
|
|
/* error packets have 9 byte structure size */
|
|
ksmbd_debug(SMB,
|
|
"Illegal request size %u for command %d\n",
|
|
le16_to_cpu(pdu->StructureSize2), command);
|
|
return 1;
|
|
} else if (command == SMB2_OPLOCK_BREAK_HE &&
|
|
hdr->Status == 0 &&
|
|
le16_to_cpu(pdu->StructureSize2) != OP_BREAK_STRUCT_SIZE_20 &&
|
|
le16_to_cpu(pdu->StructureSize2) != OP_BREAK_STRUCT_SIZE_21) {
|
|
/* special case for SMB2.1 lease break message */
|
|
ksmbd_debug(SMB,
|
|
"Illegal request size %d for oplock break\n",
|
|
le16_to_cpu(pdu->StructureSize2));
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (smb2_calc_size(hdr, &clc_len))
|
|
return 1;
|
|
|
|
if (len != clc_len) {
|
|
/* client can return one byte more due to implied bcc[0] */
|
|
if (clc_len == len + 1)
|
|
goto validate_credit;
|
|
|
|
/*
|
|
* Some windows servers (win2016) will pad also the final
|
|
* PDU in a compound to 8 bytes.
|
|
*/
|
|
if (ALIGN(clc_len, 8) == len)
|
|
goto validate_credit;
|
|
|
|
/*
|
|
* SMB2 NEGOTIATE request will be validated when message
|
|
* handling proceeds.
|
|
*/
|
|
if (command == SMB2_NEGOTIATE_HE)
|
|
goto validate_credit;
|
|
|
|
/*
|
|
* Allow a message that padded to 8byte boundary.
|
|
*/
|
|
if (clc_len < len && (len - clc_len) < 8)
|
|
goto validate_credit;
|
|
|
|
pr_err_ratelimited(
|
|
"cli req too short, len %d not %d. cmd:%d mid:%llu\n",
|
|
len, clc_len, command,
|
|
le64_to_cpu(hdr->MessageId));
|
|
|
|
return 1;
|
|
}
|
|
|
|
validate_credit:
|
|
if ((work->conn->vals->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU) &&
|
|
smb2_validate_credit_charge(work->conn, hdr)) {
|
|
work->conn->ops->set_rsp_status(work, STATUS_INVALID_PARAMETER);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int smb2_negotiate_request(struct ksmbd_work *work)
|
|
{
|
|
return ksmbd_smb_negotiate_common(work, SMB2_NEGOTIATE_HE);
|
|
}
|