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ksmbd: reorder and document on-disk and netlink structures in headers 

Reorder and document on-disk and netlink structures in headers.

This is a userspace ABI to communicate data between ksmbd and user IPC
daemon using netlink. This is added to track and cache user account DB
and share configuration info from userspace.

 - KSMBD_EVENT_HEARTBEAT_REQUEST(ksmbd_heartbeat)
   This event is to check whether user IPC daemon is alive. If user IPC
   daemon is dead, ksmbd keep existing connection till disconnecting and
   new connection will be denied.

 - KSMBD_EVENT_STARTING_UP(ksmbd_startup_request)
   This event is to receive the information that initializes the ksmbd
   server from the user IPC daemon and to start the server. The global
   section parameters are given from smb.conf as initialization
   information.

 - KSMBD_EVENT_SHUTTING_DOWN(ksmbd_shutdown_request)
   This event is to shutdown ksmbd server.

 - KSMBD_EVENT_LOGIN_REQUEST/RESPONSE(ksmbd_login_request/response)
   This event is to get user account info to user IPC daemon.

 - KSMBD_EVENT_SHARE_CONFIG_REQUEST/RESPONSE
   (ksmbd_share_config_request/response)
   This event is to get net share configuration info.

 - KSMBD_EVENT_TREE_CONNECT_REQUEST/RESPONSE
   (ksmbd_tree_connect_request/response)
   This event is to get session and tree connect info.

 - KSMBD_EVENT_TREE_DISCONNECT_REQUEST(ksmbd_tree_disconnect_request)
   This event is to send tree disconnect info to user IPC daemon.

 - KSMBD_EVENT_LOGOUT_REQUEST(ksmbd_logout_request)
   This event is to send logout request to user IPC daemon.

 - KSMBD_EVENT_RPC_REQUEST/RESPONSE(ksmbd_rpc_command)
   This event is to make DCE/RPC request like srvsvc, wkssvc, lsarpc,
   samr to be processed in userspace.

 - KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST/RESPONSE
   (ksmbd_spnego_authen_request/response)
   This event is to make kerberos authentication to be processed in
   userspace.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Namjae Jeon 2021-06-29 14:52:00 +09:00
parent c63ee4a521
commit 8b758859df
7 changed files with 269 additions and 122 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

177
fs/ksmbd/ksmbd_server.h → fs/ksmbd/ksmbd_netlink.h
View File

@ -10,6 +10,49 @@
#include <linux/types.h>
/*
* This is a userspace ABI to communicate data between ksmbd and user IPC
* daemon using netlink. This is added to track and cache user account DB
* and share configuration info from userspace.
*
* - KSMBD_EVENT_HEARTBEAT_REQUEST(ksmbd_heartbeat)
* This event is to check whether user IPC daemon is alive. If user IPC
* daemon is dead, ksmbd keep existing connection till disconnecting and
* new connection will be denied.
*
* - KSMBD_EVENT_STARTING_UP(ksmbd_startup_request)
* This event is to receive the information that initializes the ksmbd
* server from the user IPC daemon and to start the server. The global
* section parameters are given from smb.conf as initialization
* information.
*
* - KSMBD_EVENT_SHUTTING_DOWN(ksmbd_shutdown_request)
* This event is to shutdown ksmbd server.
*
* - KSMBD_EVENT_LOGIN_REQUEST/RESPONSE(ksmbd_login_request/response)
* This event is to get user account info to user IPC daemon.
*
* - KSMBD_EVENT_SHARE_CONFIG_REQUEST/RESPONSE(ksmbd_share_config_request/response)
* This event is to get net share configuration info.
*
* - KSMBD_EVENT_TREE_CONNECT_REQUEST/RESPONSE(ksmbd_tree_connect_request/response)
* This event is to get session and tree connect info.
*
* - KSMBD_EVENT_TREE_DISCONNECT_REQUEST(ksmbd_tree_disconnect_request)
* This event is to send tree disconnect info to user IPC daemon.
*
* - KSMBD_EVENT_LOGOUT_REQUEST(ksmbd_logout_request)
* This event is to send logout request to user IPC daemon.
*
* - KSMBD_EVENT_RPC_REQUEST/RESPONSE(ksmbd_rpc_command)
* This event is to make DCE/RPC request like srvsvc, wkssvc, lsarpc,
* samr to be processed in userspace.
*
* - KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST/RESPONSE(ksmbd_spnego_authen_request/response)
* This event is to make kerberos authentication to be processed in
* userspace.
*/
#define KSMBD_GENL_NAME "SMBD_GENL"
#define KSMBD_GENL_VERSION 0x01
@ -17,6 +60,9 @@
#define KSMBD_REQ_MAX_HASH_SZ 18
#define KSMBD_REQ_MAX_SHARE_NAME 64
/*
* IPC heartbeat frame to check whether user IPC daemon is alive.
*/
struct ksmbd_heartbeat {
__u32 handle;
};
@ -29,53 +75,79 @@ struct ksmbd_heartbeat {
#define KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION BIT(1)
#define KSMBD_GLOBAL_FLAG_SMB3_MULTICHANNEL BIT(2)
/*
* IPC request for ksmbd server startup
*/
struct ksmbd_startup_request {
__u32 flags;
__s32 signing;
__s8 min_prot[16];
__s8 max_prot[16];
__u32 flags; /* Flags for global config */
__s32 signing; /* Signing enabled */
__s8 min_prot[16]; /* The minimum SMB protocol version */
__s8 max_prot[16]; /* The maximum SMB protocol version */
__s8 netbios_name[16];
__s8 work_group[64];
__s8 server_string[64];
__u16 tcp_port;
__u16 ipc_timeout;
__u32 deadtime;
__u32 file_max;
__u32 smb2_max_write;
__u32 smb2_max_read;
__u32 smb2_max_trans;
__u32 share_fake_fscaps;
__u32 sub_auth[3];
__u32 ifc_list_sz;
__s8 work_group[64]; /* Workgroup */
__s8 server_string[64]; /* Server string */
__u16 tcp_port; /* tcp port */
__u16 ipc_timeout; /*
* specifies the number of seconds
* server will wait for the userspace to
* reply to heartbeat frames.
*/
__u32 deadtime; /* Number of minutes of inactivity */
__u32 file_max; /* Limits the maximum number of open files */
__u32 smb2_max_write; /* MAX write size */
__u32 smb2_max_read; /* MAX read size */
__u32 smb2_max_trans; /* MAX trans size */
__u32 share_fake_fscaps; /*
* Support some special application that
* makes QFSINFO calls to check whether
* we set the SPARSE_FILES bit (0x40).
*/
__u32 sub_auth[3]; /* Subauth value for Security ID */
__u32 ifc_list_sz; /* interfaces list size */
__s8 ____payload[];
};
#define KSMBD_STARTUP_CONFIG_INTERFACES(s) ((s)->____payload)
/*
* IPC request to shutdown ksmbd server.
*/
struct ksmbd_shutdown_request {
__s32 reserved;
};
/*
* IPC user login request.
*/
struct ksmbd_login_request {
__u32 handle;
__s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ];
__s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ]; /* user account name */
};
/*
* IPC user login response.
*/
struct ksmbd_login_response {
__u32 handle;
__u32 gid;
__u32 uid;
__s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ];
__u32 gid; /* group id */
__u32 uid; /* user id */
__s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ]; /* user account name */
__u16 status;
__u16 hash_sz;
__s8 hash[KSMBD_REQ_MAX_HASH_SZ];
__u16 hash_sz; /* hash size */
__s8 hash[KSMBD_REQ_MAX_HASH_SZ]; /* password hash */
};
/*
* IPC request to fetch net share config.
*/
struct ksmbd_share_config_request {
__u32 handle;
__s8 share_name[KSMBD_REQ_MAX_SHARE_NAME];
__s8 share_name[KSMBD_REQ_MAX_SHARE_NAME]; /* share name */
};
/*
* IPC response to the net share config request.
*/
struct ksmbd_share_config_response {
__u32 handle;
__u32 flags;
@ -102,6 +174,10 @@ ksmbd_share_config_path(struct ksmbd_share_config_response *sc)
return p;
}
/*
* IPC request for tree connection. This request include session and tree
* connect info from client.
*/
struct ksmbd_tree_connect_request {
__u32 handle;
__u16 account_flags;
@ -113,21 +189,34 @@ struct ksmbd_tree_connect_request {
__s8 peer_addr[64];
};
/*
* IPC Response structure for tree connection.
*/
struct ksmbd_tree_connect_response {
__u32 handle;
__u16 status;
__u16 connection_flags;
};
/*
* IPC Request struture to disconnect tree connection.
*/
struct ksmbd_tree_disconnect_request {
__u64 session_id;
__u64 connect_id;
__u64 session_id; /* session id */
__u64 connect_id; /* tree connection id */
};
/*
* IPC Response structure to logout user account.
*/
struct ksmbd_logout_request {
__s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ];
__s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ]; /* user account name */
};
/*
* RPC command structure to send rpc request like srvsvc or wkssvc to
* IPC user daemon.
*/
struct ksmbd_rpc_command {
__u32 handle;
__u32 flags;
@ -135,18 +224,36 @@ struct ksmbd_rpc_command {
__u8 payload[];
};
/*
* IPC Request Kerberos authentication
*/
struct ksmbd_spnego_authen_request {
__u32 handle;
__u16 spnego_blob_len;
__u8 spnego_blob[0];
__u16 spnego_blob_len; /* the length of spnego_blob */
__u8 spnego_blob[0]; /*
* the GSS token from SecurityBuffer of
* SMB2 SESSION SETUP request
*/
};
/*
* Response data which includes the GSS token and the session key generated by
* user daemon.
*/
struct ksmbd_spnego_authen_response {
__u32 handle;
struct ksmbd_login_response login_response;
__u16 session_key_len;
__u16 spnego_blob_len;
__u8 payload[]; /* session key + AP_REP */
struct ksmbd_login_response login_response; /*
* the login response with
* a user identified by the
* GSS token from a client
*/
__u16 session_key_len; /* the length of the session key */
__u16 spnego_blob_len; /*
* the length of the GSS token which will be
* stored in SecurityBuffer of SMB2 SESSION
* SETUP response
*/
__u8 payload[]; /* session key + AP_REP */
};
/*
@ -185,6 +292,9 @@ enum ksmbd_event {
KSMBD_EVENT_MAX
};
/*
* Enumeration for IPC tree connect status.
*/
enum KSMBD_TREE_CONN_STATUS {
KSMBD_TREE_CONN_STATUS_OK = 0,
KSMBD_TREE_CONN_STATUS_NOMEM,
@ -262,6 +372,9 @@ enum KSMBD_TREE_CONN_STATUS {
#define KSMBD_RPC_LSARPC_METHOD_INVOKE BIT(11)
#define KSMBD_RPC_LSARPC_METHOD_RETURN (KSMBD_RPC_LSARPC_METHOD_INVOKE | KSMBD_RPC_METHOD_RETURN)
/*
* RPC status definitions.
*/
#define KSMBD_RPC_OK 0
#define KSMBD_RPC_EBAD_FUNC 0x00000001
#define KSMBD_RPC_EACCESS_DENIED 0x00000005

1
fs/ksmbd/ksmbd_work.c
View File

@ -12,7 +12,6 @@
#include "connection.h"
#include "ksmbd_work.h"
#include "mgmt/ksmbd_ida.h"
#include "ksmbd_server.h"
static struct kmem_cache *work_cache;
static struct workqueue_struct *ksmbd_wq;

2
fs/ksmbd/mgmt/tree_connect.h
View File

@ -8,7 +8,7 @@
#include <linux/hashtable.h>
#include "../ksmbd_server.h"
#include "../ksmbd_netlink.h"
struct ksmbd_share_config;
struct ksmbd_user;

1
fs/ksmbd/smb2ops.c
View File

@ -12,7 +12,6 @@
#include "connection.h"
#include "smb_common.h"
#include "server.h"
#include "ksmbd_server.h"
static struct smb_version_values smb21_server_values = {
.version_string = SMB21_VERSION_STRING,

1
fs/ksmbd/smbacl.c
View File

@ -14,7 +14,6 @@
#include "smb_common.h"
#include "server.h"
#include "misc.h"
#include "ksmbd_server.h"
#include "mgmt/share_config.h"
static const struct smb_sid domain = {1, 4, {0, 0, 0, 0, 0, 5},

87
fs/ksmbd/vfs.h
View File

@ -14,92 +14,7 @@
#include <linux/posix_acl.h>
#include "smbacl.h"
/* STREAM XATTR PREFIX */
#define STREAM_PREFIX "DosStream."
#define STREAM_PREFIX_LEN (sizeof(STREAM_PREFIX) - 1)
#define XATTR_NAME_STREAM (XATTR_USER_PREFIX STREAM_PREFIX)
#define XATTR_NAME_STREAM_LEN (sizeof(XATTR_NAME_STREAM) - 1)
enum {
XATTR_DOSINFO_ATTRIB = 0x00000001,
XATTR_DOSINFO_EA_SIZE = 0x00000002,
XATTR_DOSINFO_SIZE = 0x00000004,
XATTR_DOSINFO_ALLOC_SIZE = 0x00000008,
XATTR_DOSINFO_CREATE_TIME = 0x00000010,
XATTR_DOSINFO_CHANGE_TIME = 0x00000020,
XATTR_DOSINFO_ITIME = 0x00000040
};
struct xattr_dos_attrib {
__u16 version;
__u32 flags;
__u32 attr;
__u32 ea_size;
__u64 size;
__u64 alloc_size;
__u64 create_time;
__u64 change_time;
__u64 itime;
};
/* DOS ATTRIBUITE XATTR PREFIX */
#define DOS_ATTRIBUTE_PREFIX "DOSATTRIB"
#define DOS_ATTRIBUTE_PREFIX_LEN (sizeof(DOS_ATTRIBUTE_PREFIX) - 1)
#define XATTR_NAME_DOS_ATTRIBUTE \
(XATTR_USER_PREFIX DOS_ATTRIBUTE_PREFIX)
#define XATTR_NAME_DOS_ATTRIBUTE_LEN \
(sizeof(XATTR_USER_PREFIX DOS_ATTRIBUTE_PREFIX) - 1)
#define XATTR_SD_HASH_TYPE_SHA256 0x1
#define XATTR_SD_HASH_SIZE 64
#define SMB_ACL_READ 4
#define SMB_ACL_WRITE 2
#define SMB_ACL_EXECUTE 1
enum {
SMB_ACL_TAG_INVALID = 0,
SMB_ACL_USER,
SMB_ACL_USER_OBJ,
SMB_ACL_GROUP,
SMB_ACL_GROUP_OBJ,
SMB_ACL_OTHER,
SMB_ACL_MASK
};
struct xattr_acl_entry {
int type;
uid_t uid;
gid_t gid;
mode_t perm;
};
struct xattr_smb_acl {
int count;
int next;
struct xattr_acl_entry entries[0];
};
struct xattr_ntacl {
__u16 version;
void *sd_buf;
__u32 sd_size;
__u16 hash_type;
__u8 desc[10];
__u16 desc_len;
__u64 current_time;
__u8 hash[XATTR_SD_HASH_SIZE];
__u8 posix_acl_hash[XATTR_SD_HASH_SIZE];
};
/* SECURITY DESCRIPTOR XATTR PREFIX */
#define SD_PREFIX "NTACL"
#define SD_PREFIX_LEN (sizeof(SD_PREFIX) - 1)
#define XATTR_NAME_SD \
(XATTR_SECURITY_PREFIX SD_PREFIX)
#define XATTR_NAME_SD_LEN \
(sizeof(XATTR_SECURITY_PREFIX SD_PREFIX) - 1)
#include "xattr.h"
/*
* Enumeration for stream type.

122
fs/ksmbd/xattr.h Normal file
View File

@ -0,0 +1,122 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2021 Samsung Electronics Co., Ltd.
*/
#ifndef __XATTR_H__
#define __XATTR_H__
/*
* These are on-disk structures to store additional metadata into xattr to
* reproduce windows filesystem semantics. And they are encoded with NDR to
* compatible with samba's xattr meta format. The compatibility with samba
* is important because it can lose the information(file attribute,
* creation time, acls) about the existing files when switching between
* ksmbd and samba.
*/
/*
* Dos attribute flags used for what variable is valid.
*/
enum {
XATTR_DOSINFO_ATTRIB = 0x00000001,
XATTR_DOSINFO_EA_SIZE = 0x00000002,
XATTR_DOSINFO_SIZE = 0x00000004,
XATTR_DOSINFO_ALLOC_SIZE = 0x00000008,
XATTR_DOSINFO_CREATE_TIME = 0x00000010,
XATTR_DOSINFO_CHANGE_TIME = 0x00000020,
XATTR_DOSINFO_ITIME = 0x00000040
};
/*
* Dos attribute structure which is compatible with samba's one.
* Storing it into the xattr named "DOSATTRIB" separately from inode
* allows ksmbd to faithfully reproduce windows filesystem semantics
* on top of a POSIX filesystem.
*/
struct xattr_dos_attrib {
__u16 version; /* version 3 or version 4 */
__u32 flags; /* valid flags */
__u32 attr; /* Dos attribute */
__u32 ea_size; /* EA size */
__u64 size;
__u64 alloc_size;
__u64 create_time; /* File creation time */
__u64 change_time; /* File change time */
__u64 itime; /* Invented/Initial time */
};
/*
* Enumeration is used for computing posix acl hash.
*/
enum {
SMB_ACL_TAG_INVALID = 0,
SMB_ACL_USER,
SMB_ACL_USER_OBJ,
SMB_ACL_GROUP,
SMB_ACL_GROUP_OBJ,
SMB_ACL_OTHER,
SMB_ACL_MASK
};
#define SMB_ACL_READ 4
#define SMB_ACL_WRITE 2
#define SMB_ACL_EXECUTE 1
struct xattr_acl_entry {
int type;
uid_t uid;
gid_t gid;
mode_t perm;
};
/*
* xattr_smb_acl structure is used for computing posix acl hash.
*/
struct xattr_smb_acl {
int count;
int next;
struct xattr_acl_entry entries[0];
};
/* 64bytes hash in xattr_ntacl is computed with sha256 */
#define XATTR_SD_HASH_TYPE_SHA256 0x1
#define XATTR_SD_HASH_SIZE 64
/*
* xattr_ntacl is used for storing ntacl and hashes.
* Hash is used for checking valid posix acl and ntacl in xattr.
*/
struct xattr_ntacl {
__u16 version; /* version 4*/
void *sd_buf;
__u32 sd_size;
__u16 hash_type; /* hash type */
__u8 desc[10]; /* posix_acl description */
__u16 desc_len;
__u64 current_time;
__u8 hash[XATTR_SD_HASH_SIZE]; /* 64bytes hash for ntacl */
__u8 posix_acl_hash[XATTR_SD_HASH_SIZE]; /* 64bytes hash for posix acl */
};
/* DOS ATTRIBUITE XATTR PREFIX */
#define DOS_ATTRIBUTE_PREFIX "DOSATTRIB"
#define DOS_ATTRIBUTE_PREFIX_LEN (sizeof(DOS_ATTRIBUTE_PREFIX) - 1)
#define XATTR_NAME_DOS_ATTRIBUTE (XATTR_USER_PREFIX DOS_ATTRIBUTE_PREFIX)
#define XATTR_NAME_DOS_ATTRIBUTE_LEN \
(sizeof(XATTR_USER_PREFIX DOS_ATTRIBUTE_PREFIX) - 1)
/* STREAM XATTR PREFIX */
#define STREAM_PREFIX "DosStream."
#define STREAM_PREFIX_LEN (sizeof(STREAM_PREFIX) - 1)
#define XATTR_NAME_STREAM (XATTR_USER_PREFIX STREAM_PREFIX)
#define XATTR_NAME_STREAM_LEN (sizeof(XATTR_NAME_STREAM) - 1)
/* SECURITY DESCRIPTOR(NTACL) XATTR PREFIX */
#define SD_PREFIX "NTACL"
#define SD_PREFIX_LEN (sizeof(SD_PREFIX) - 1)
#define XATTR_NAME_SD (XATTR_SECURITY_PREFIX SD_PREFIX)
#define XATTR_NAME_SD_LEN \
(sizeof(XATTR_SECURITY_PREFIX SD_PREFIX) - 1)
#endif /* __XATTR_H__ */