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-rw-r--r--fs/ksmbd/smb2misc.c449
1 files changed, 0 insertions, 449 deletions
diff --git a/fs/ksmbd/smb2misc.c b/fs/ksmbd/smb2misc.c
deleted file mode 100644
index 6e25ace36568..000000000000
--- a/fs/ksmbd/smb2misc.c
+++ /dev/null
@@ -1,449 +0,0 @@
-// 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:
- {
- int lock_count;
-
- /*
- * smb2_lock request size is 48 included single
- * smb2_lock_element structure size.
- */
- lock_count = le16_to_cpu(((struct smb2_lock_req *)hdr)->LockCount) - 1;
- if (lock_count > 0) {
- *off = __SMB2_HEADER_STRUCTURE_SIZE + 48;
- *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;
-
- /*
- * windows client also pad up to 8 bytes when compounding.
- * If pad is longer than eight bytes, log the server behavior
- * (once), since may indicate a problem but allow it and
- * continue since the frame is parseable.
- */
- if (clc_len < len) {
- ksmbd_debug(SMB,
- "cli req padded more than expected. Length %d not %d for cmd:%d mid:%llu\n",
- len, clc_len, command,
- le64_to_cpu(hdr->MessageId));
- goto validate_credit;
- }
-
- ksmbd_debug(SMB,
- "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);
-}
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