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libntfs/source/security.h

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/*
* security.h - Exports for handling security/ACLs in NTFS.
* Originated from the Linux-NTFS project.
*
* Copyright (c) 2004 Anton Altaparmakov
* Copyright (c) 2005-2006 Szabolcs Szakacsits
* Copyright (c) 2007-2008 Jean-Pierre Andre
*
* This program/include file is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program/include file is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (in the main directory of the NTFS-3G
* distribution in the file COPYING); if not, write to the Free Software
* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _NTFS_SECURITY_H
#define _NTFS_SECURITY_H
#include "types.h"
#include "layout.h"
#include "inode.h"
#include "dir.h"
#ifndef POSIXACLS
#define POSIXACLS 0
#endif
typedef u16 be16;
typedef u32 be32;
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define const_cpu_to_be16(x) ((((x) & 255L) << 8) + (((x) >> 8) & 255L))
#define const_cpu_to_be32(x) ((((x) & 255L) << 24) + (((x) & 0xff00L) << 8) \
+ (((x) >> 8) & 0xff00L) + (((x) >> 24) & 255L))
#else
#define const_cpu_to_be16(x) (x)
#define const_cpu_to_be32(x) (x)
#endif
/*
* item in the mapping list
*/
struct MAPPING {
struct MAPPING *next;
int xid; /* linux id : uid or gid */
SID *sid; /* Windows id : usid or gsid */
int grcnt; /* group count (for users only) */
gid_t *groups; /* groups which the user is member of */
};
/*
* Entry in the permissions cache
* Note : this cache is not organized as a generic cache
*/
struct CACHED_PERMISSIONS {
uid_t uid;
gid_t gid;
le32 inh_fileid;
le32 inh_dirid;
#if POSIXACLS
struct POSIX_SECURITY *pxdesc;
unsigned int pxdescsize:16;
#endif
unsigned int mode:12;
unsigned int valid:1;
} ;
/*
* Entry in the permissions cache for directories with no security_id
*/
struct CACHED_PERMISSIONS_LEGACY {
struct CACHED_PERMISSIONS_LEGACY *next;
struct CACHED_PERMISSIONS_LEGACY *previous;
void *variable;
size_t varsize;
/* above fields must match "struct CACHED_GENERIC" */
u64 mft_no;
struct CACHED_PERMISSIONS perm;
} ;
/*
* Entry in the securid cache
*/
struct CACHED_SECURID {
struct CACHED_SECURID *next;
struct CACHED_SECURID *previous;
void *variable;
size_t varsize;
/* above fields must match "struct CACHED_GENERIC" */
uid_t uid;
gid_t gid;
unsigned int dmode;
le32 securid;
} ;
/*
* Header of the security cache
* (has no cache structure by itself)
*/
struct CACHED_PERMISSIONS_HEADER {
unsigned int last;
/* statistics for permissions */
unsigned long p_writes;
unsigned long p_reads;
unsigned long p_hits;
} ;
/*
* The whole permissions cache
*/
struct PERMISSIONS_CACHE {
struct CACHED_PERMISSIONS_HEADER head;
struct CACHED_PERMISSIONS *cachetable[1]; /* array of variable size */
} ;
/*
* Security flags values
*/
enum {
SECURITY_DEFAULT, /* rely on fuse for permissions checking */
SECURITY_RAW, /* force same ownership/permissions on files */
SECURITY_ADDSECURIDS, /* upgrade old security descriptors */
SECURITY_STATICGRPS, /* use static groups for access control */
SECURITY_WANTED /* a security related option was present */
} ;
/*
* Security context, needed by most security functions
*/
enum { MAPUSERS, MAPGROUPS, MAPCOUNT } ;
struct SECURITY_CONTEXT {
ntfs_volume *vol;
struct MAPPING *mapping[MAPCOUNT];
struct PERMISSIONS_CACHE **pseccache;
uid_t uid; /* uid of user requesting (not the mounter) */
gid_t gid; /* gid of user requesting (not the mounter) */
pid_t tid; /* thread id of thread requesting */
mode_t umask; /* umask of requesting thread */
} ;
#if POSIXACLS
/*
* Posix ACL structures
*/
struct POSIX_ACE {
u16 tag;
u16 perms;
s32 id;
} __attribute__((__packed__));
struct POSIX_ACL {
u8 version;
u8 flags;
u16 filler;
struct POSIX_ACE ace[0];
} __attribute__((__packed__));
struct POSIX_SECURITY {
mode_t mode;
int acccnt;
int defcnt;
int firstdef;
u16 tagsset;
struct POSIX_ACL acl;
} ;
/*
* Posix tags, cpu-endian 16 bits
*/
enum {
POSIX_ACL_USER_OBJ = 1,
POSIX_ACL_USER = 2,
POSIX_ACL_GROUP_OBJ = 4,
POSIX_ACL_GROUP = 8,
POSIX_ACL_MASK = 16,
POSIX_ACL_OTHER = 32,
POSIX_ACL_SPECIAL = 64 /* internal use only */
} ;
#define POSIX_ACL_EXTENSIONS (POSIX_ACL_USER | POSIX_ACL_GROUP | POSIX_ACL_MASK)
/*
* Posix permissions, cpu-endian 16 bits
*/
enum {
POSIX_PERM_X = 1,
POSIX_PERM_W = 2,
POSIX_PERM_R = 4,
POSIX_PERM_DENIAL = 64 /* internal use only */
} ;
#define POSIX_VERSION 2
#endif
extern BOOL ntfs_guid_is_zero(const GUID *guid);
extern char *ntfs_guid_to_mbs(const GUID *guid, char *guid_str);
/**
* ntfs_sid_is_valid - determine if a SID is valid
* @sid: SID for which to determine if it is valid
*
* Determine if the SID pointed to by @sid is valid.
*
* Return TRUE if it is valid and FALSE otherwise.
*/
static __inline__ BOOL ntfs_sid_is_valid(const SID *sid)
{
if (!sid || sid->revision != SID_REVISION ||
sid->sub_authority_count > SID_MAX_SUB_AUTHORITIES)
return FALSE;
return TRUE;
}
extern int ntfs_sid_to_mbs_size(const SID *sid);
extern char *ntfs_sid_to_mbs(const SID *sid, char *sid_str,
size_t sid_str_size);
extern void ntfs_generate_guid(GUID *guid);
extern int ntfs_sd_add_everyone(ntfs_inode *ni);
extern le32 ntfs_security_hash(const SECURITY_DESCRIPTOR_RELATIVE *sd,
const u32 len);
int ntfs_build_mapping(struct SECURITY_CONTEXT *scx, const char *usermap_path,
BOOL allowdef);
int ntfs_get_owner_mode(struct SECURITY_CONTEXT *scx,
ntfs_inode *ni, struct stat*);
int ntfs_set_mode(struct SECURITY_CONTEXT *scx, ntfs_inode *ni, mode_t mode);
BOOL ntfs_allowed_as_owner(struct SECURITY_CONTEXT *scx, ntfs_inode *ni);
int ntfs_allowed_access(struct SECURITY_CONTEXT *scx,
ntfs_inode *ni, int accesstype);
BOOL old_ntfs_allowed_dir_access(struct SECURITY_CONTEXT *scx,
const char *path, int accesstype);
#if POSIXACLS
le32 ntfs_alloc_securid(struct SECURITY_CONTEXT *scx,
uid_t uid, gid_t gid, ntfs_inode *dir_ni,
mode_t mode, BOOL isdir);
#else
le32 ntfs_alloc_securid(struct SECURITY_CONTEXT *scx,
uid_t uid, gid_t gid, mode_t mode, BOOL isdir);
#endif
int ntfs_set_owner(struct SECURITY_CONTEXT *scx, ntfs_inode *ni,
uid_t uid, gid_t gid);
int ntfs_set_ownmod(struct SECURITY_CONTEXT *scx,
ntfs_inode *ni, uid_t uid, gid_t gid, mode_t mode);
#if POSIXACLS
int ntfs_set_owner_mode(struct SECURITY_CONTEXT *scx,
ntfs_inode *ni, uid_t uid, gid_t gid,
mode_t mode, struct POSIX_SECURITY *pxdesc);
#else
int ntfs_set_owner_mode(struct SECURITY_CONTEXT *scx,
ntfs_inode *ni, uid_t uid, gid_t gid, mode_t mode);
#endif
le32 ntfs_inherited_id(struct SECURITY_CONTEXT *scx,
ntfs_inode *dir_ni, BOOL fordir);
int ntfs_open_secure(ntfs_volume *vol);
void ntfs_close_secure(struct SECURITY_CONTEXT *scx);
#if POSIXACLS
int ntfs_set_inherited_posix(struct SECURITY_CONTEXT *scx,
ntfs_inode *ni, uid_t uid, gid_t gid,
ntfs_inode *dir_ni, mode_t mode);
int ntfs_get_posix_acl(struct SECURITY_CONTEXT *scx, ntfs_inode *ni,
const char *name, char *value, size_t size);
int ntfs_set_posix_acl(struct SECURITY_CONTEXT *scx, ntfs_inode *ni,
const char *name, const char *value, size_t size,
int flags);
int ntfs_remove_posix_acl(struct SECURITY_CONTEXT *scx, ntfs_inode *ni,
const char *name);
#endif
int ntfs_get_ntfs_acl(struct SECURITY_CONTEXT *scx, ntfs_inode *ni,
char *value, size_t size);
int ntfs_set_ntfs_acl(struct SECURITY_CONTEXT *scx, ntfs_inode *ni,
const char *value, size_t size, int flags);
int ntfs_get_ntfs_attrib(ntfs_inode *ni, char *value, size_t size);
int ntfs_set_ntfs_attrib(ntfs_inode *ni,
const char *value, size_t size, int flags);
/*
* Security API for direct access to security descriptors
* based on Win32 API
*/
#define MAGIC_API 0x09042009
struct SECURITY_API {
u32 magic;
struct SECURITY_CONTEXT security;
struct PERMISSIONS_CACHE *seccache;
} ;
/*
* The following constants are used in interfacing external programs.
* They are not to be stored on disk and must be defined in their
* native cpu representation.
* When disk representation (le) is needed, use SE_DACL_PRESENT, etc.
*/
enum { OWNER_SECURITY_INFORMATION = 1,
GROUP_SECURITY_INFORMATION = 2,
DACL_SECURITY_INFORMATION = 4,
SACL_SECURITY_INFORMATION = 8
} ;
int ntfs_get_file_security(struct SECURITY_API *scapi,
const char *path, u32 selection,
char *buf, u32 buflen, u32 *psize);
int ntfs_set_file_security(struct SECURITY_API *scapi,
const char *path, u32 selection, const char *attr);
int ntfs_get_file_attributes(struct SECURITY_API *scapi,
const char *path);
BOOL ntfs_set_file_attributes(struct SECURITY_API *scapi,
const char *path, s32 attrib);
BOOL ntfs_read_directory(struct SECURITY_API *scapi,
const char *path, ntfs_filldir_t callback, void *context);
int ntfs_read_sds(struct SECURITY_API *scapi,
char *buf, u32 size, u32 offset);
INDEX_ENTRY *ntfs_read_sii(struct SECURITY_API *scapi,
INDEX_ENTRY *entry);
INDEX_ENTRY *ntfs_read_sdh(struct SECURITY_API *scapi,
INDEX_ENTRY *entry);
struct SECURITY_API *ntfs_initialize_file_security(const char *device,
int flags);
BOOL ntfs_leave_file_security(struct SECURITY_API *scx);
int ntfs_get_usid(struct SECURITY_API *scapi, uid_t uid, char *buf);
int ntfs_get_gsid(struct SECURITY_API *scapi, gid_t gid, char *buf);
int ntfs_get_user(struct SECURITY_API *scapi, const SID *usid);
int ntfs_get_group(struct SECURITY_API *scapi, const SID *gsid);
#endif /* defined _NTFS_SECURITY_H */
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