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c057c799e3
linux/fs/ksmbd/vfs.h
Hyunchul Lee 265fd1991c ksmbd: use LOOKUP_BENEATH to prevent the out of share access 
instead of removing '..' in a given path, call
kern_path with LOOKUP_BENEATH flag to prevent
the out of share access.

ran various test on this:
smb2-cat-async smb://127.0.0.1/homes/../out_of_share
smb2-cat-async smb://127.0.0.1/homes/foo/../../out_of_share
smbclient //127.0.0.1/homes -c "mkdir ../foo2"
smbclient //127.0.0.1/homes -c "rename bar ../bar"

Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Ralph Boehme <slow@samba.org>
Tested-by: Steve French <smfrench@gmail.com>
Tested-by: Namjae Jeon <linkinjeon@kernel.org>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
2021-09-24 21:25:23 -05:00

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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 __KSMBD_VFS_H__
#define __KSMBD_VFS_H__
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/namei.h>
#include <uapi/linux/xattr.h>
#include <linux/posix_acl.h>
#include "smbacl.h"
#include "xattr.h"
/*
* Enumeration for stream type.
*/
enum {
DATA_STREAM = 1, /* type $DATA */
DIR_STREAM /* type $INDEX_ALLOCATION */
};
/* CreateOptions */
/* Flag is set, it must not be a file , valid for directory only */
#define FILE_DIRECTORY_FILE_LE cpu_to_le32(0x00000001)
#define FILE_WRITE_THROUGH_LE cpu_to_le32(0x00000002)
#define FILE_SEQUENTIAL_ONLY_LE cpu_to_le32(0x00000004)
/* Should not buffer on server*/
#define FILE_NO_INTERMEDIATE_BUFFERING_LE cpu_to_le32(0x00000008)
/* MBZ */
#define FILE_SYNCHRONOUS_IO_ALERT_LE cpu_to_le32(0x00000010)
/* MBZ */
#define FILE_SYNCHRONOUS_IO_NONALERT_LE cpu_to_le32(0x00000020)
/* Flaf must not be set for directory */
#define FILE_NON_DIRECTORY_FILE_LE cpu_to_le32(0x00000040)
/* Should be zero */
#define CREATE_TREE_CONNECTION cpu_to_le32(0x00000080)
#define FILE_COMPLETE_IF_OPLOCKED_LE cpu_to_le32(0x00000100)
#define FILE_NO_EA_KNOWLEDGE_LE cpu_to_le32(0x00000200)
#define FILE_OPEN_REMOTE_INSTANCE cpu_to_le32(0x00000400)
/**
* Doc says this is obsolete "open for recovery" flag should be zero
* in any case.
*/
#define CREATE_OPEN_FOR_RECOVERY cpu_to_le32(0x00000400)
#define FILE_RANDOM_ACCESS_LE cpu_to_le32(0x00000800)
#define FILE_DELETE_ON_CLOSE_LE cpu_to_le32(0x00001000)
#define FILE_OPEN_BY_FILE_ID_LE cpu_to_le32(0x00002000)
#define FILE_OPEN_FOR_BACKUP_INTENT_LE cpu_to_le32(0x00004000)
#define FILE_NO_COMPRESSION_LE cpu_to_le32(0x00008000)
/* Should be zero*/
#define FILE_OPEN_REQUIRING_OPLOCK cpu_to_le32(0x00010000)
#define FILE_DISALLOW_EXCLUSIVE cpu_to_le32(0x00020000)
#define FILE_RESERVE_OPFILTER_LE cpu_to_le32(0x00100000)
#define FILE_OPEN_REPARSE_POINT_LE cpu_to_le32(0x00200000)
#define FILE_OPEN_NO_RECALL_LE cpu_to_le32(0x00400000)
/* Should be zero */
#define FILE_OPEN_FOR_FREE_SPACE_QUERY_LE cpu_to_le32(0x00800000)
#define CREATE_OPTIONS_MASK cpu_to_le32(0x00FFFFFF)
#define CREATE_OPTION_READONLY 0x10000000
/* system. NB not sent over wire */
#define CREATE_OPTION_SPECIAL 0x20000000
struct ksmbd_work;
struct ksmbd_file;
struct ksmbd_conn;
struct ksmbd_dir_info {
const char *name;
char *wptr;
char *rptr;
int name_len;
int out_buf_len;
int num_entry;
int data_count;
int last_entry_offset;
bool hide_dot_file;
int flags;
};
struct ksmbd_readdir_data {
struct dir_context ctx;
union {
void *private;
char *dirent;
};
unsigned int used;
unsigned int dirent_count;
unsigned int file_attr;
};
/* ksmbd kstat wrapper to get valid create time when reading dir entry */
struct ksmbd_kstat {
struct kstat *kstat;
unsigned long long create_time;
__le32 file_attributes;
};
int ksmbd_vfs_lock_parent(struct user_namespace *user_ns, struct dentry *parent,
struct dentry *child);
int ksmbd_vfs_may_delete(struct user_namespace *user_ns, struct dentry *dentry);
int ksmbd_vfs_query_maximal_access(struct user_namespace *user_ns,
struct dentry *dentry, __le32 *daccess);
int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode);
int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode);
int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp,
size_t count, loff_t *pos);
int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp,
char *buf, size_t count, loff_t *pos, bool sync,
ssize_t *written);
int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id);
int ksmbd_vfs_remove_file(struct ksmbd_work *work, char *name);
int ksmbd_vfs_link(struct ksmbd_work *work,
const char *oldname, const char *newname);
int ksmbd_vfs_getattr(struct path *path, struct kstat *stat);
int ksmbd_vfs_fp_rename(struct ksmbd_work *work, struct ksmbd_file *fp,
char *newname);
int ksmbd_vfs_truncate(struct ksmbd_work *work,
struct ksmbd_file *fp, loff_t size);
struct srv_copychunk;
int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
struct ksmbd_file *src_fp,
struct ksmbd_file *dst_fp,
struct srv_copychunk *chunks,
unsigned int chunk_count,
unsigned int *chunk_count_written,
unsigned int *chunk_size_written,
loff_t *total_size_written);
ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list);
ssize_t ksmbd_vfs_getxattr(struct user_namespace *user_ns,
struct dentry *dentry,
char *xattr_name,
char **xattr_buf);
ssize_t ksmbd_vfs_casexattr_len(struct user_namespace *user_ns,
struct dentry *dentry, char *attr_name,
int attr_name_len);
int ksmbd_vfs_setxattr(struct user_namespace *user_ns,
struct dentry *dentry, const char *attr_name,
const void *attr_value, size_t attr_size, int flags);
int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
size_t *xattr_stream_name_size, int s_type);
int ksmbd_vfs_remove_xattr(struct user_namespace *user_ns,
struct dentry *dentry, char *attr_name);
int ksmbd_vfs_kern_path(struct ksmbd_work *work,
char *name, unsigned int flags, struct path *path,
bool caseless);
struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work,
const char *name,
unsigned int flags,
struct path *path);
int ksmbd_vfs_empty_dir(struct ksmbd_file *fp);
void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option);
int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp,
loff_t off, loff_t len);
struct file_allocated_range_buffer;
int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
struct file_allocated_range_buffer *ranges,
int in_count, int *out_count);
int ksmbd_vfs_unlink(struct user_namespace *user_ns,
struct dentry *dir, struct dentry *dentry);
void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat);
int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
struct user_namespace *user_ns,
struct dentry *dentry,
struct ksmbd_kstat *ksmbd_kstat);
void ksmbd_vfs_posix_lock_wait(struct file_lock *flock);
int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout);
void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock);
int ksmbd_vfs_remove_acl_xattrs(struct user_namespace *user_ns,
struct dentry *dentry);
int ksmbd_vfs_remove_sd_xattrs(struct user_namespace *user_ns,
struct dentry *dentry);
int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn,
struct user_namespace *user_ns,
struct dentry *dentry,
struct smb_ntsd *pntsd, int len);
int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn,
struct user_namespace *user_ns,
struct dentry *dentry,
struct smb_ntsd **pntsd);
int ksmbd_vfs_set_dos_attrib_xattr(struct user_namespace *user_ns,
struct dentry *dentry,
struct xattr_dos_attrib *da);
int ksmbd_vfs_get_dos_attrib_xattr(struct user_namespace *user_ns,
struct dentry *dentry,
struct xattr_dos_attrib *da);
int ksmbd_vfs_set_init_posix_acl(struct user_namespace *user_ns,
struct inode *inode);
int ksmbd_vfs_inherit_posix_acl(struct user_namespace *user_ns,
struct inode *inode,
struct inode *parent_inode);
#endif /* __KSMBD_VFS_H__ */
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