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