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linux/fs/ksmbd/smb2pdu.h
Namjae Jeon 62c487b53a ksmbd: limit pdu length size according to connection status 
Stream protocol length will never be larger than 16KB until session setup.
After session setup, the size of requests will not be larger than
16KB + SMB2 MAX WRITE size. This patch limits these invalidly oversized
requests and closes the connection immediately.

Fixes: 0626e6641f ("cifsd: add server handler for central processing and tranport layers")
Cc: stable@vger.kernel.org
Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-18259
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
2023-01-25 18:22:54 -06:00

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*/
#ifndef _SMB2PDU_H
#define _SMB2PDU_H
#include "ntlmssp.h"
#include "smbacl.h"
/*Create Action Flags*/
#define FILE_SUPERSEDED 0x00000000
#define FILE_OPENED 0x00000001
#define FILE_CREATED 0x00000002
#define FILE_OVERWRITTEN 0x00000003
/* SMB2 Max Credits */
#define SMB2_MAX_CREDITS 8192
/* BB FIXME - analyze following length BB */
#define MAX_SMB2_HDR_SIZE 0x78 /* 4 len + 64 hdr + (2*24 wct) + 2 bct + 2 pad */
#define SMB21_DEFAULT_IOSIZE (1024 * 1024)
#define SMB3_DEFAULT_TRANS_SIZE (1024 * 1024)
#define SMB3_MIN_IOSIZE (64 * 1024)
#define SMB3_MAX_IOSIZE (8 * 1024 * 1024)
#define SMB3_MAX_MSGSIZE (4 * 4096)
/*
* Definitions for SMB2 Protocol Data Units (network frames)
*
* See MS-SMB2.PDF specification for protocol details.
* The Naming convention is the lower case version of the SMB2
* command code name for the struct. Note that structures must be packed.
*
*/
struct preauth_integrity_info {
/* PreAuth integrity Hash ID */
__le16 Preauth_HashId;
/* PreAuth integrity Hash Value */
__u8 Preauth_HashValue[SMB2_PREAUTH_HASH_SIZE];
};
/* offset is sizeof smb2_negotiate_rsp but rounded up to 8 bytes. */
#ifdef CONFIG_SMB_SERVER_KERBEROS5
/* sizeof(struct smb2_negotiate_rsp) =
* header(64) + response(64) + GSS_LENGTH(96) + GSS_PADDING(0)
*/
#define OFFSET_OF_NEG_CONTEXT 0xe0
#else
/* sizeof(struct smb2_negotiate_rsp) =
* header(64) + response(64) + GSS_LENGTH(74) + GSS_PADDING(6)
*/
#define OFFSET_OF_NEG_CONTEXT 0xd0
#endif
#define SMB2_SESSION_EXPIRED (0)
#define SMB2_SESSION_IN_PROGRESS BIT(0)
#define SMB2_SESSION_VALID BIT(1)
struct create_durable_req_v2 {
struct create_context ccontext;
__u8 Name[8];
__le32 Timeout;
__le32 Flags;
__u8 Reserved[8];
__u8 CreateGuid[16];
} __packed;
struct create_durable_reconn_req {
struct create_context ccontext;
__u8 Name[8];
union {
__u8 Reserved[16];
struct {
__u64 PersistentFileId;
__u64 VolatileFileId;
} Fid;
} Data;
} __packed;
struct create_durable_reconn_v2_req {
struct create_context ccontext;
__u8 Name[8];
struct {
__u64 PersistentFileId;
__u64 VolatileFileId;
} Fid;
__u8 CreateGuid[16];
__le32 Flags;
} __packed;
struct create_app_inst_id {
struct create_context ccontext;
__u8 Name[8];
__u8 Reserved[8];
__u8 AppInstanceId[16];
} __packed;
struct create_app_inst_id_vers {
struct create_context ccontext;
__u8 Name[8];
__u8 Reserved[2];
__u8 Padding[4];
__le64 AppInstanceVersionHigh;
__le64 AppInstanceVersionLow;
} __packed;
struct create_mxac_req {
struct create_context ccontext;
__u8 Name[8];
__le64 Timestamp;
} __packed;
struct create_alloc_size_req {
struct create_context ccontext;
__u8 Name[8];
__le64 AllocationSize;
} __packed;
struct create_durable_rsp {
struct create_context ccontext;
__u8 Name[8];
union {
__u8 Reserved[8];
__u64 data;
} Data;
} __packed;
struct create_durable_v2_rsp {
struct create_context ccontext;
__u8 Name[8];
__le32 Timeout;
__le32 Flags;
} __packed;
struct create_mxac_rsp {
struct create_context ccontext;
__u8 Name[8];
__le32 QueryStatus;
__le32 MaximalAccess;
} __packed;
struct create_disk_id_rsp {
struct create_context ccontext;
__u8 Name[8];
__le64 DiskFileId;
__le64 VolumeId;
__u8 Reserved[16];
} __packed;
/* equivalent of the contents of SMB3.1.1 POSIX open context response */
struct create_posix_rsp {
struct create_context ccontext;
__u8 Name[16];
__le32 nlink;
__le32 reparse_tag;
__le32 mode;
/* SidBuffer contain two sids(Domain sid(28), UNIX group sid(16)) */
u8 SidBuffer[44];
} __packed;
struct smb2_buffer_desc_v1 {
__le64 offset;
__le32 token;
__le32 length;
} __packed;
#define SMB2_0_IOCTL_IS_FSCTL 0x00000001
struct smb_sockaddr_in {
__be16 Port;
__be32 IPv4address;
__u8 Reserved[8];
} __packed;
struct smb_sockaddr_in6 {
__be16 Port;
__be32 FlowInfo;
__u8 IPv6address[16];
__be32 ScopeId;
} __packed;
#define INTERNETWORK 0x0002
#define INTERNETWORKV6 0x0017
struct sockaddr_storage_rsp {
__le16 Family;
union {
struct smb_sockaddr_in addr4;
struct smb_sockaddr_in6 addr6;
};
} __packed;
#define RSS_CAPABLE 0x00000001
#define RDMA_CAPABLE 0x00000002
struct network_interface_info_ioctl_rsp {
__le32 Next; /* next interface. zero if this is last one */
__le32 IfIndex;
__le32 Capability; /* RSS or RDMA Capable */
__le32 Reserved;
__le64 LinkSpeed;
char SockAddr_Storage[128];
} __packed;
struct file_object_buf_type1_ioctl_rsp {
__u8 ObjectId[16];
__u8 BirthVolumeId[16];
__u8 BirthObjectId[16];
__u8 DomainId[16];
} __packed;
struct resume_key_ioctl_rsp {
__u64 ResumeKey[3];
__le32 ContextLength;
__u8 Context[4]; /* ignored, Windows sets to 4 bytes of zero */
} __packed;
struct copychunk_ioctl_req {
__le64 ResumeKey[3];
__le32 ChunkCount;
__le32 Reserved;
__u8 Chunks[1]; /* array of srv_copychunk */
} __packed;
struct srv_copychunk {
__le64 SourceOffset;
__le64 TargetOffset;
__le32 Length;
__le32 Reserved;
} __packed;
struct copychunk_ioctl_rsp {
__le32 ChunksWritten;
__le32 ChunkBytesWritten;
__le32 TotalBytesWritten;
} __packed;
struct file_sparse {
__u8 SetSparse;
} __packed;
/* FILE Info response size */
#define FILE_DIRECTORY_INFORMATION_SIZE 1
#define FILE_FULL_DIRECTORY_INFORMATION_SIZE 2
#define FILE_BOTH_DIRECTORY_INFORMATION_SIZE 3
#define FILE_BASIC_INFORMATION_SIZE 40
#define FILE_STANDARD_INFORMATION_SIZE 24
#define FILE_INTERNAL_INFORMATION_SIZE 8
#define FILE_EA_INFORMATION_SIZE 4
#define FILE_ACCESS_INFORMATION_SIZE 4
#define FILE_NAME_INFORMATION_SIZE 9
#define FILE_RENAME_INFORMATION_SIZE 10
#define FILE_LINK_INFORMATION_SIZE 11
#define FILE_NAMES_INFORMATION_SIZE 12
#define FILE_DISPOSITION_INFORMATION_SIZE 13
#define FILE_POSITION_INFORMATION_SIZE 14
#define FILE_FULL_EA_INFORMATION_SIZE 15
#define FILE_MODE_INFORMATION_SIZE 4
#define FILE_ALIGNMENT_INFORMATION_SIZE 4
#define FILE_ALL_INFORMATION_SIZE 104
#define FILE_ALLOCATION_INFORMATION_SIZE 19
#define FILE_END_OF_FILE_INFORMATION_SIZE 20
#define FILE_ALTERNATE_NAME_INFORMATION_SIZE 8
#define FILE_STREAM_INFORMATION_SIZE 32
#define FILE_PIPE_INFORMATION_SIZE 23
#define FILE_PIPE_LOCAL_INFORMATION_SIZE 24
#define FILE_PIPE_REMOTE_INFORMATION_SIZE 25
#define FILE_MAILSLOT_QUERY_INFORMATION_SIZE 26
#define FILE_MAILSLOT_SET_INFORMATION_SIZE 27
#define FILE_COMPRESSION_INFORMATION_SIZE 16
#define FILE_OBJECT_ID_INFORMATION_SIZE 29
/* Number 30 not defined in documents */
#define FILE_MOVE_CLUSTER_INFORMATION_SIZE 31
#define FILE_QUOTA_INFORMATION_SIZE 32
#define FILE_REPARSE_POINT_INFORMATION_SIZE 33
#define FILE_NETWORK_OPEN_INFORMATION_SIZE 56
#define FILE_ATTRIBUTE_TAG_INFORMATION_SIZE 8
/* FS Info response size */
#define FS_DEVICE_INFORMATION_SIZE 8
#define FS_ATTRIBUTE_INFORMATION_SIZE 16
#define FS_VOLUME_INFORMATION_SIZE 24
#define FS_SIZE_INFORMATION_SIZE 24
#define FS_FULL_SIZE_INFORMATION_SIZE 32
#define FS_SECTOR_SIZE_INFORMATION_SIZE 28
#define FS_OBJECT_ID_INFORMATION_SIZE 64
#define FS_CONTROL_INFORMATION_SIZE 48
#define FS_POSIX_INFORMATION_SIZE 56
/* FS_ATTRIBUTE_File_System_Name */
#define FS_TYPE_SUPPORT_SIZE 44
struct fs_type_info {
char *fs_name;
long magic_number;
} __packed;
/*
* PDU query infolevel structure definitions
* BB consider moving to a different header
*/
struct smb2_file_access_info {
__le32 AccessFlags;
} __packed;
struct smb2_file_alignment_info {
__le32 AlignmentRequirement;
} __packed;
struct smb2_file_basic_info { /* data block encoding of response to level 18 */
__le64 CreationTime; /* Beginning of FILE_BASIC_INFO equivalent */
__le64 LastAccessTime;
__le64 LastWriteTime;
__le64 ChangeTime;
__le32 Attributes;
__u32 Pad1; /* End of FILE_BASIC_INFO_INFO equivalent */
} __packed;
struct smb2_file_alt_name_info {
__le32 FileNameLength;
char FileName[];
} __packed;
struct smb2_file_stream_info {
__le32 NextEntryOffset;
__le32 StreamNameLength;
__le64 StreamSize;
__le64 StreamAllocationSize;
char StreamName[];
} __packed;
struct smb2_file_ntwrk_info {
__le64 CreationTime;
__le64 LastAccessTime;
__le64 LastWriteTime;
__le64 ChangeTime;
__le64 AllocationSize;
__le64 EndOfFile;
__le32 Attributes;
__le32 Reserved;
} __packed;
struct smb2_file_standard_info {
__le64 AllocationSize;
__le64 EndOfFile;
__le32 NumberOfLinks; /* hard links */
__u8 DeletePending;
__u8 Directory;
__le16 Reserved;
} __packed; /* level 18 Query */
struct smb2_file_ea_info {
__le32 EASize;
} __packed;
struct smb2_file_alloc_info {
__le64 AllocationSize;
} __packed;
struct smb2_file_disposition_info {
__u8 DeletePending;
} __packed;
struct smb2_file_pos_info {
__le64 CurrentByteOffset;
} __packed;
#define FILE_MODE_INFO_MASK cpu_to_le32(0x0000100e)
struct smb2_file_mode_info {
__le32 Mode;
} __packed;
#define COMPRESSION_FORMAT_NONE 0x0000
#define COMPRESSION_FORMAT_LZNT1 0x0002
struct smb2_file_comp_info {
__le64 CompressedFileSize;
__le16 CompressionFormat;
__u8 CompressionUnitShift;
__u8 ChunkShift;
__u8 ClusterShift;
__u8 Reserved[3];
} __packed;
struct smb2_file_attr_tag_info {
__le32 FileAttributes;
__le32 ReparseTag;
} __packed;
#define SL_RESTART_SCAN 0x00000001
#define SL_RETURN_SINGLE_ENTRY 0x00000002
#define SL_INDEX_SPECIFIED 0x00000004
struct smb2_ea_info_req {
__le32 NextEntryOffset;
__u8 EaNameLength;
char name[1];
} __packed; /* level 15 Query */
struct smb2_ea_info {
__le32 NextEntryOffset;
__u8 Flags;
__u8 EaNameLength;
__le16 EaValueLength;
char name[1];
/* optionally followed by value */
} __packed; /* level 15 Query */
struct create_ea_buf_req {
struct create_context ccontext;
__u8 Name[8];
struct smb2_ea_info ea;
} __packed;
struct create_sd_buf_req {
struct create_context ccontext;
__u8 Name[8];
struct smb_ntsd ntsd;
} __packed;
struct smb2_posix_info {
__le32 NextEntryOffset;
__u32 Ignored;
__le64 CreationTime;
__le64 LastAccessTime;
__le64 LastWriteTime;
__le64 ChangeTime;
__le64 EndOfFile;
__le64 AllocationSize;
__le32 DosAttributes;
__le64 Inode;
__le32 DeviceId;
__le32 Zero;
/* beginning of POSIX Create Context Response */
__le32 HardLinks;
__le32 ReparseTag;
__le32 Mode;
/* SidBuffer contain two sids (UNIX user sid(16), UNIX group sid(16)) */
u8 SidBuffer[32];
__le32 name_len;
u8 name[];
/*
* var sized owner SID
* var sized group SID
* le32 filenamelength
* u8 filename[]
*/
} __packed;
/* functions */
void init_smb2_1_server(struct ksmbd_conn *conn);
void init_smb3_0_server(struct ksmbd_conn *conn);
void init_smb3_02_server(struct ksmbd_conn *conn);
int init_smb3_11_server(struct ksmbd_conn *conn);
void init_smb2_max_read_size(unsigned int sz);
void init_smb2_max_write_size(unsigned int sz);
void init_smb2_max_trans_size(unsigned int sz);
void init_smb2_max_credits(unsigned int sz);
bool is_smb2_neg_cmd(struct ksmbd_work *work);
bool is_smb2_rsp(struct ksmbd_work *work);
u16 get_smb2_cmd_val(struct ksmbd_work *work);
void set_smb2_rsp_status(struct ksmbd_work *work, __le32 err);
int init_smb2_rsp_hdr(struct ksmbd_work *work);
int smb2_allocate_rsp_buf(struct ksmbd_work *work);
bool is_chained_smb2_message(struct ksmbd_work *work);
int init_smb2_neg_rsp(struct ksmbd_work *work);
void smb2_set_err_rsp(struct ksmbd_work *work);
int smb2_check_user_session(struct ksmbd_work *work);
int smb2_get_ksmbd_tcon(struct ksmbd_work *work);
bool smb2_is_sign_req(struct ksmbd_work *work, unsigned int command);
int smb2_check_sign_req(struct ksmbd_work *work);
void smb2_set_sign_rsp(struct ksmbd_work *work);
int smb3_check_sign_req(struct ksmbd_work *work);
void smb3_set_sign_rsp(struct ksmbd_work *work);
int find_matching_smb2_dialect(int start_index, __le16 *cli_dialects,
__le16 dialects_count);
struct file_lock *smb_flock_init(struct file *f);
int setup_async_work(struct ksmbd_work *work, void (*fn)(void **),
void **arg);
void smb2_send_interim_resp(struct ksmbd_work *work, __le32 status);
struct channel *lookup_chann_list(struct ksmbd_session *sess,
struct ksmbd_conn *conn);
void smb3_preauth_hash_rsp(struct ksmbd_work *work);
bool smb3_is_transform_hdr(void *buf);
int smb3_decrypt_req(struct ksmbd_work *work);
int smb3_encrypt_resp(struct ksmbd_work *work);
bool smb3_11_final_sess_setup_resp(struct ksmbd_work *work);
int smb2_set_rsp_credits(struct ksmbd_work *work);
bool smb3_encryption_negotiated(struct ksmbd_conn *conn);
/* smb2 misc functions */
int ksmbd_smb2_check_message(struct ksmbd_work *work);
/* smb2 command handlers */
int smb2_handle_negotiate(struct ksmbd_work *work);
int smb2_negotiate_request(struct ksmbd_work *work);
int smb2_sess_setup(struct ksmbd_work *work);
int smb2_tree_connect(struct ksmbd_work *work);
int smb2_tree_disconnect(struct ksmbd_work *work);
int smb2_session_logoff(struct ksmbd_work *work);
int smb2_open(struct ksmbd_work *work);
int smb2_query_info(struct ksmbd_work *work);
int smb2_query_dir(struct ksmbd_work *work);
int smb2_close(struct ksmbd_work *work);
int smb2_echo(struct ksmbd_work *work);
int smb2_set_info(struct ksmbd_work *work);
int smb2_read(struct ksmbd_work *work);
int smb2_write(struct ksmbd_work *work);
int smb2_flush(struct ksmbd_work *work);
int smb2_cancel(struct ksmbd_work *work);
int smb2_lock(struct ksmbd_work *work);
int smb2_ioctl(struct ksmbd_work *work);
int smb2_oplock_break(struct ksmbd_work *work);
int smb2_notify(struct ksmbd_work *ksmbd_work);
/*
* Get the body of the smb2 message excluding the 4 byte rfc1002 headers
* from request/response buffer.
*/
static inline void *smb2_get_msg(void *buf)
{
return buf + 4;
}
#endif /* _SMB2PDU_H */
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