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libntfs/source/xattrs.c

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/**
* xattrs.c : common functions to deal with system extended attributes
*
* Copyright (c) 2010 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
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_SETXATTR /* extended attributes support required */
#ifdef HAVE_STDIO_H
#include <stdio.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include "types.h"
#include "param.h"
#include "layout.h"
#include "attrib.h"
#include "index.h"
#include "dir.h"
#include "security.h"
#include "acls.h"
#include "efs.h"
#include "reparse.h"
#include "object_id.h"
#include "misc.h"
#include "logging.h"
#include "xattrs.h"
#if POSIXACLS
#if __BYTE_ORDER == __BIG_ENDIAN
/*
* Posix ACL structures
*/
struct LE_POSIX_ACE {
le16 tag;
le16 perms;
le32 id;
} __attribute__((__packed__));
struct LE_POSIX_ACL {
u8 version;
u8 flags;
le16 filler;
struct LE_POSIX_ACE ace[0];
} __attribute__((__packed__));
#endif
#endif
static const char xattr_ntfs_3g[] = "ntfs-3g.";
static const char nf_ns_user_prefix[] = "user.";
static const int nf_ns_user_prefix_len = sizeof(nf_ns_user_prefix) - 1;
static const char nf_ns_xattr_ntfs_acl[] = "system.ntfs_acl";
static const char nf_ns_xattr_attrib[] = "system.ntfs_attrib";
static const char nf_ns_xattr_attrib_be[] = "system.ntfs_attrib_be";
static const char nf_ns_xattr_efsinfo[] = "system.ntfs_efsinfo";
static const char nf_ns_xattr_reparse[] = "system.ntfs_reparse_data";
static const char nf_ns_xattr_object_id[] = "system.ntfs_object_id";
static const char nf_ns_xattr_dos_name[] = "system.ntfs_dos_name";
static const char nf_ns_xattr_times[] = "system.ntfs_times";
static const char nf_ns_xattr_times_be[] = "system.ntfs_times_be";
static const char nf_ns_xattr_crtime[] = "system.ntfs_crtime";
static const char nf_ns_xattr_crtime_be[] = "system.ntfs_crtime_be";
static const char nf_ns_xattr_posix_access[] = "system.posix_acl_access";
static const char nf_ns_xattr_posix_default[] = "system.posix_acl_default";
static const char nf_ns_alt_xattr_efsinfo[] = "user.ntfs.efsinfo";
struct XATTRNAME {
enum SYSTEMXATTRS xattr;
const char *name;
} ;
static struct XATTRNAME nf_ns_xattr_names[] = {
{ XATTR_NTFS_ACL, nf_ns_xattr_ntfs_acl },
{ XATTR_NTFS_ATTRIB, nf_ns_xattr_attrib },
{ XATTR_NTFS_ATTRIB_BE, nf_ns_xattr_attrib_be },
{ XATTR_NTFS_EFSINFO, nf_ns_xattr_efsinfo },
{ XATTR_NTFS_REPARSE_DATA, nf_ns_xattr_reparse },
{ XATTR_NTFS_OBJECT_ID, nf_ns_xattr_object_id },
{ XATTR_NTFS_DOS_NAME, nf_ns_xattr_dos_name },
{ XATTR_NTFS_TIMES, nf_ns_xattr_times },
{ XATTR_NTFS_TIMES_BE, nf_ns_xattr_times_be },
{ XATTR_NTFS_CRTIME, nf_ns_xattr_crtime },
{ XATTR_NTFS_CRTIME_BE, nf_ns_xattr_crtime_be },
{ XATTR_POSIX_ACC, nf_ns_xattr_posix_access },
{ XATTR_POSIX_DEF, nf_ns_xattr_posix_default },
{ XATTR_UNMAPPED, (char*)NULL } /* terminator */
};
/*
* Make an integer big-endian
*
* Swap bytes on a small-endian computer and does nothing on a
* big-endian computer.
*/
static void fix_big_endian(char *p, int size)
{
#if __BYTE_ORDER == __LITTLE_ENDIAN
int i,j;
int c;
i = 0;
j = size - 1;
while (i < j) {
c = p[i];
p[i++] = p[j];
p[j--] = c;
}
#endif
}
#if POSIXACLS
#if __BYTE_ORDER == __BIG_ENDIAN
/*
* Make a Posix ACL CPU endian
*/
static int le_acl_to_cpu(const struct LE_POSIX_ACL *le_acl, size_t size,
struct POSIX_ACL *acl)
{
int i;
int cnt;
acl->version = le_acl->version;
acl->flags = le_acl->flags;
acl->filler = 0;
cnt = (size - sizeof(struct LE_POSIX_ACL)) / sizeof(struct LE_POSIX_ACE);
for (i=0; i<cnt; i++) {
acl->ace[i].tag = le16_to_cpu(le_acl->ace[i].tag);
acl->ace[i].perms = le16_to_cpu(le_acl->ace[i].perms);
acl->ace[i].id = le32_to_cpu(le_acl->ace[i].id);
}
return (0);
}
/*
* Make a Posix ACL little endian
*/
int cpu_to_le_acl(const struct POSIX_ACL *acl, size_t size,
struct LE_POSIX_ACL *le_acl)
{
int i;
int cnt;
le_acl->version = acl->version;
le_acl->flags = acl->flags;
le_acl->filler = const_cpu_to_le16(0);
cnt = (size - sizeof(struct POSIX_ACL)) / sizeof(struct POSIX_ACE);
for (i=0; i<cnt; i++) {
le_acl->ace[i].tag = cpu_to_le16(acl->ace[i].tag);
le_acl->ace[i].perms = cpu_to_le16(acl->ace[i].perms);
le_acl->ace[i].id = cpu_to_le32(acl->ace[i].id);
}
return (0);
}
#endif
#endif
/*
* Determine whether an extended attribute is mapped to
* internal data (original name in system namespace, or renamed)
*/
enum SYSTEMXATTRS ntfs_xattr_system_type(const char *name,
ntfs_volume *vol)
{
struct XATTRNAME *p;
enum SYSTEMXATTRS ret;
#ifdef XATTR_MAPPINGS
const struct XATTRMAPPING *q;
#endif /* XATTR_MAPPINGS */
p = nf_ns_xattr_names;
while (p->name && strcmp(p->name,name))
p++;
ret = p->xattr;
#ifdef XATTR_MAPPINGS
if (!p->name && vol && vol->xattr_mapping) {
q = vol->xattr_mapping;
while (q && strcmp(q->name,name))
q = q->next;
if (q)
ret = q->xattr;
}
#else /* XATTR_MAPPINGS */
if (!p->name
&& vol
&& vol->efs_raw
&& !strcmp(nf_ns_alt_xattr_efsinfo,name))
ret = XATTR_NTFS_EFSINFO;
#endif /* XATTR_MAPPINGS */
return (ret);
}
#ifdef XATTR_MAPPINGS
/*
* Basic read from a user mapping file on another volume
*/
static int basicread(void *fileid, char *buf, size_t size, off_t offs __attribute__((unused)))
{
return (read(*(int*)fileid, buf, size));
}
/*
* Read from a user mapping file on current NTFS partition
*/
static int localread(void *fileid, char *buf, size_t size, off_t offs)
{
return (ntfs_attr_data_read((ntfs_inode*)fileid,
AT_UNNAMED, 0, buf, size, offs));
}
/*
* Get a single mapping item from buffer
*
* Always reads a full line, truncating long lines
* Refills buffer when exhausted
* Returns pointer to item, or NULL when there is no more
* Note : errors are logged, but not returned
// TODO partially share with acls.c
*/
static struct XATTRMAPPING *getmappingitem(FILEREADER reader, void *fileid,
off_t *poffs, char *buf, int *psrc, s64 *psize)
{
int src;
int dst;
char *pe;
char *ps;
char *pu;
enum SYSTEMXATTRS xattr;
int gotend;
char maptext[LINESZ];
struct XATTRMAPPING *item;
src = *psrc;
dst = 0;
do {
gotend = 0;
while ((src < *psize)
&& (buf[src] != '\n')) {
/* ignore spaces */
if ((dst < LINESZ)
&& (buf[src] != '\r')
&& (buf[src] != '\t')
&& (buf[src] != ' '))
maptext[dst++] = buf[src];
src++;
}
if (src >= *psize) {
*poffs += *psize;
*psize = reader(fileid, buf, (size_t)BUFSZ, *poffs);
src = 0;
} else {
gotend = 1;
src++;
maptext[dst] = '\0';
dst = 0;
}
} while (*psize && ((maptext[0] == '#') || !gotend));
item = (struct XATTRMAPPING*)NULL;
if (gotend) {
/* decompose into system name and user name */
ps = maptext;
pu = strchr(maptext,':');
if (pu) {
*pu++ = 0;
pe = strchr(pu,':');
if (pe)
*pe = 0;
/* check name validity */
if ((strlen(pu) < 6) || strncmp(pu,"user.",5))
pu = (char*)NULL;
xattr = ntfs_xattr_system_type(ps,
(ntfs_volume*)NULL);
if (xattr == XATTR_UNMAPPED)
pu = (char*)NULL;
}
if (pu) {
item = (struct XATTRMAPPING*)ntfs_malloc(
sizeof(struct XATTRMAPPING)
+ strlen(pu));
if (item) {
item->xattr = xattr;
strcpy(item->name,pu);
item->next = (struct XATTRMAPPING*)NULL;
}
} else {
ntfs_log_early_error("Bad xattr mapping item, aborting\n");
}
}
*psrc = src;
return (item);
}
/*
* Read xattr mapping file and split into their attribute.
* Parameters are kept in a chained list.
* Returns the head of list, if any
* Errors are logged, but not returned
*
* If an absolute path is provided, the mapping file is assumed
* to be located in another mounted file system, and plain read()
* are used to get its contents.
* If a relative path is provided, the mapping file is assumed
* to be located on the current file system, and internal IO
* have to be used since we are still mounting and we have not
* entered the fuse loop yet.
*/
static struct XATTRMAPPING *ntfs_read_xattr_mapping(FILEREADER reader,
void *fileid)
{
char buf[BUFSZ];
struct XATTRMAPPING *item;
struct XATTRMAPPING *current;
struct XATTRMAPPING *firstitem;
struct XATTRMAPPING *lastitem;
BOOL duplicated;
int src;
off_t offs;
s64 size;
firstitem = (struct XATTRMAPPING*)NULL;
lastitem = (struct XATTRMAPPING*)NULL;
offs = 0;
size = reader(fileid, buf, (size_t)BUFSZ, (off_t)0);
if (size > 0) {
src = 0;
do {
item = getmappingitem(reader, fileid, &offs,
buf, &src, &size);
if (item) {
/* check no double mapping */
duplicated = FALSE;
for (current=firstitem; current; current=current->next)
if ((current->xattr == item->xattr)
|| !strcmp(current->name,item->name))
duplicated = TRUE;
if (duplicated) {
free(item);
ntfs_log_early_error("Conflicting xattr mapping ignored\n");
} else {
item->next = (struct XATTRMAPPING*)NULL;
if (lastitem)
lastitem->next = item;
else
firstitem = item;
lastitem = item;
}
}
} while (item);
}
return (firstitem);
}
/*
* Build the extended attribute mappings to user namespace
*
* Note : no error is returned. If we refused mounting when there
* is an error it would be too difficult to fix the offending file
*/
struct XATTRMAPPING *ntfs_xattr_build_mapping(ntfs_volume *vol,
const char *xattrmap_path)
{
struct XATTRMAPPING *firstmapping;
struct XATTRMAPPING *mapping;
BOOL user_efs;
BOOL notfound;
ntfs_inode *ni;
int fd;
firstmapping = (struct XATTRMAPPING*)NULL;
notfound = FALSE;
if (!xattrmap_path)
xattrmap_path = XATTRMAPPINGFILE;
if (xattrmap_path[0] == '/') {
fd = open(xattrmap_path,O_RDONLY);
if (fd > 0) {
firstmapping = ntfs_read_xattr_mapping(basicread, (void*)&fd);
close(fd);
} else
notfound = TRUE;
} else {
ni = ntfs_pathname_to_inode(vol, NULL, xattrmap_path);
if (ni) {
firstmapping = ntfs_read_xattr_mapping(localread, ni);
ntfs_inode_close(ni);
} else
notfound = TRUE;
}
if (notfound && strcmp(xattrmap_path, XATTRMAPPINGFILE)) {
ntfs_log_early_error("Could not open \"%s\"\n",xattrmap_path);
}
if (vol->efs_raw) {
user_efs = TRUE;
for (mapping=firstmapping; mapping; mapping=mapping->next)
if (mapping->xattr == XATTR_NTFS_EFSINFO)
user_efs = FALSE;
} else
user_efs = FALSE;
if (user_efs) {
mapping = (struct XATTRMAPPING*)ntfs_malloc(
sizeof(struct XATTRMAPPING)
+ strlen(nf_ns_alt_xattr_efsinfo));
if (mapping) {
mapping->next = firstmapping;
mapping->xattr = XATTR_NTFS_EFSINFO;
strcpy(mapping->name,nf_ns_alt_xattr_efsinfo);
firstmapping = mapping;
}
}
return (firstmapping);
}
void ntfs_xattr_free_mapping(struct XATTRMAPPING *mapping)
{
struct XATTRMAPPING *p, *q;
p = mapping;
while (p) {
q = p->next;
free(p);
p = q;
}
}
#endif /* XATTR_MAPPINGS */
int ntfs_xattr_system_getxattr(struct SECURITY_CONTEXT *scx,
enum SYSTEMXATTRS attr,
ntfs_inode *ni, ntfs_inode *dir_ni,
char *value, size_t size)
{
int res;
int i;
#if POSIXACLS
#if __BYTE_ORDER == __BIG_ENDIAN
struct POSIX_ACL *acl;
#endif
#endif
/*
* the returned value is the needed
* size. If it is too small, no copy
* is done, and the caller has to
* issue a new call with correct size.
*/
switch (attr) {
case XATTR_NTFS_ACL :
res = ntfs_get_ntfs_acl(scx, ni, value, size);
break;
#if POSIXACLS
#if __BYTE_ORDER == __BIG_ENDIAN
case XATTR_POSIX_ACC :
acl = (struct POSIX_ACL*)ntfs_malloc(size);
if (acl) {
res = ntfs_get_posix_acl(scx, ni,
nf_ns_xattr_posix_access, (char*)acl, size);
if (res > 0) {
if (cpu_to_le_acl(acl,res,
(struct LE_POSIX_ACL*)value))
res = -errno;
}
free(acl);
} else
res = -errno;
break;
case XATTR_POSIX_DEF :
acl = (struct POSIX_ACL*)ntfs_malloc(size);
if (acl) {
res = ntfs_get_posix_acl(scx, ni,
nf_ns_xattr_posix_default, (char*)acl, size);
if (res > 0) {
if (cpu_to_le_acl(acl,res,
(struct LE_POSIX_ACL*)value))
res = -errno;
}
free(acl);
} else
res = -errno;
break;
#else
case XATTR_POSIX_ACC :
res = ntfs_get_posix_acl(scx, ni, nf_ns_xattr_posix_access,
value, size);
break;
case XATTR_POSIX_DEF :
res = ntfs_get_posix_acl(scx, ni, nf_ns_xattr_posix_default,
value, size);
break;
#endif
#endif
case XATTR_NTFS_ATTRIB :
res = ntfs_get_ntfs_attrib(ni, value, size);
break;
case XATTR_NTFS_ATTRIB_BE :
res = ntfs_get_ntfs_attrib(ni, value, size);
if ((res == 4) && value) {
if (size >= 4)
fix_big_endian(value,4);
else
res = -EINVAL;
}
break;
case XATTR_NTFS_EFSINFO :
if (ni->vol->efs_raw)
res = ntfs_get_efs_info(ni, value, size);
else
res = -EPERM;
break;
case XATTR_NTFS_REPARSE_DATA :
res = ntfs_get_ntfs_reparse_data(ni, value, size);
break;
case XATTR_NTFS_OBJECT_ID :
res = ntfs_get_ntfs_object_id(ni, value, size);
break;
case XATTR_NTFS_DOS_NAME:
if (dir_ni)
res = ntfs_get_ntfs_dos_name(ni, dir_ni, value, size);
else
res = -errno;
break;
case XATTR_NTFS_TIMES:
res = ntfs_inode_get_times(ni, value, size);
break;
case XATTR_NTFS_TIMES_BE:
res = ntfs_inode_get_times(ni, value, size);
if ((res > 0) && value) {
for (i=0; (i+1)*sizeof(u64)<=(unsigned int)res; i++)
fix_big_endian(&value[i*sizeof(u64)],
sizeof(u64));
}
break;
case XATTR_NTFS_CRTIME:
res = ntfs_inode_get_times(ni, value,
(size >= sizeof(u64) ? sizeof(u64) : size));
break;
case XATTR_NTFS_CRTIME_BE:
res = ntfs_inode_get_times(ni, value,
(size >= sizeof(u64) ? sizeof(u64) : size));
if ((res >= (int)sizeof(u64)) && value)
fix_big_endian(value,sizeof(u64));
break;
default :
errno = EOPNOTSUPP;
res = -errno;
break;
}
return (res);
}
int ntfs_xattr_system_setxattr(struct SECURITY_CONTEXT *scx,
enum SYSTEMXATTRS attr,
ntfs_inode *ni, ntfs_inode *dir_ni,
const char *value, size_t size, int flags)
{
int res;
int i;
char buf[4*sizeof(u64)];
#if POSIXACLS
#if __BYTE_ORDER == __BIG_ENDIAN
struct POSIX_ACL *acl;
#endif
#endif
switch (attr) {
case XATTR_NTFS_ACL :
res = ntfs_set_ntfs_acl(scx, ni, value, size, flags);
break;
#if POSIXACLS
#if __BYTE_ORDER == __BIG_ENDIAN
case XATTR_POSIX_ACC :
acl = (struct POSIX_ACL*)ntfs_malloc(size);
if (acl) {
if (!le_acl_to_cpu((const struct LE_POSIX_ACL*)value,
size, acl)) {
res = ntfs_set_posix_acl(scx ,ni ,
nf_ns_xattr_posix_access,
(char*)acl, size, flags);
} else
res = -errno;
free(acl);
} else
res = -errno;
break;
case XATTR_POSIX_DEF :
acl = (struct POSIX_ACL*)ntfs_malloc(size);
if (acl) {
if (!le_acl_to_cpu((const struct LE_POSIX_ACL*)value,
size, acl)) {
res = ntfs_set_posix_acl(scx ,ni ,
nf_ns_xattr_posix_default,
(char*)acl, size, flags);
} else
res = -errno;
free(acl);
} else
res = -errno;
break;
#else
case XATTR_POSIX_ACC :
res = ntfs_set_posix_acl(scx ,ni , nf_ns_xattr_posix_access,
value, size, flags);
break;
case XATTR_POSIX_DEF :
res = ntfs_set_posix_acl(scx, ni, nf_ns_xattr_posix_default,
value, size, flags);
break;
#endif
#endif
case XATTR_NTFS_ATTRIB :
res = ntfs_set_ntfs_attrib(ni, value, size, flags);
break;
case XATTR_NTFS_ATTRIB_BE :
if (value && (size >= 4)) {
memcpy(buf,value,4);
fix_big_endian(buf,4);
res = ntfs_set_ntfs_attrib(ni, buf, 4, flags);
} else
res = ntfs_set_ntfs_attrib(ni, value, size, flags);
break;
case XATTR_NTFS_EFSINFO :
if (ni->vol->efs_raw)
res = ntfs_set_efs_info(ni, value, size, flags);
else
res = -EPERM;
break;
case XATTR_NTFS_REPARSE_DATA :
res = ntfs_set_ntfs_reparse_data(ni, value, size, flags);
break;
case XATTR_NTFS_OBJECT_ID :
res = ntfs_set_ntfs_object_id(ni, value, size, flags);
break;
case XATTR_NTFS_DOS_NAME:
if (dir_ni)
/* warning : this closes both inodes */
res = ntfs_set_ntfs_dos_name(ni, dir_ni, value,
size, flags);
else
res = -errno;
break;
case XATTR_NTFS_TIMES:
res = ntfs_inode_set_times(ni, value, size, flags);
break;
case XATTR_NTFS_TIMES_BE:
if (value && (size > 0) && (size <= 4*sizeof(u64))) {
memcpy(buf,value,size);
for (i=0; (i+1)*sizeof(u64)<=size; i++)
fix_big_endian(&buf[i*sizeof(u64)],
sizeof(u64));
res = ntfs_inode_set_times(ni, buf, size, flags);
} else
res = ntfs_inode_set_times(ni, value, size, flags);
break;
case XATTR_NTFS_CRTIME:
res = ntfs_inode_set_times(ni, value,
(size >= sizeof(u64) ? sizeof(u64) : size), flags);
break;
case XATTR_NTFS_CRTIME_BE:
if (value && (size >= sizeof(u64))) {
memcpy(buf,value,sizeof(u64));
fix_big_endian(buf,sizeof(u64));
res = ntfs_inode_set_times(ni, buf, sizeof(u64), flags);
} else
res = ntfs_inode_set_times(ni, value, size, flags);
break;
default :
errno = EOPNOTSUPP;
res = -errno;
break;
}
return (res);
}
int ntfs_xattr_system_removexattr(struct SECURITY_CONTEXT *scx,
enum SYSTEMXATTRS attr,
ntfs_inode *ni, ntfs_inode *dir_ni)
{
int res;
res = 0;
switch (attr) {
/*
* Removal of NTFS ACL, ATTRIB, EFSINFO or TIMES
* is never allowed
*/
case XATTR_NTFS_ACL :
case XATTR_NTFS_ATTRIB :
case XATTR_NTFS_ATTRIB_BE :
case XATTR_NTFS_EFSINFO :
case XATTR_NTFS_TIMES :
case XATTR_NTFS_TIMES_BE :
case XATTR_NTFS_CRTIME :
case XATTR_NTFS_CRTIME_BE :
res = -EPERM;
break;
#if POSIXACLS
case XATTR_POSIX_ACC :
case XATTR_POSIX_DEF :
if (ni) {
if (!ntfs_allowed_as_owner(scx, ni)
|| ntfs_remove_posix_acl(scx, ni,
(attr == XATTR_POSIX_ACC ?
nf_ns_xattr_posix_access :
nf_ns_xattr_posix_default)))
res = -errno;
} else
res = -errno;
break;
#endif
case XATTR_NTFS_REPARSE_DATA :
if (ni) {
if (!ntfs_allowed_as_owner(scx, ni)
|| ntfs_remove_ntfs_reparse_data(ni))
res = -errno;
} else
res = -errno;
break;
case XATTR_NTFS_OBJECT_ID :
if (ni) {
if (!ntfs_allowed_as_owner(scx, ni)
|| ntfs_remove_ntfs_object_id(ni))
res = -errno;
} else
res = -errno;
break;
case XATTR_NTFS_DOS_NAME:
if (ni && dir_ni) {
if (ntfs_remove_ntfs_dos_name(ni,dir_ni))
res = -errno;
/* ni and dir_ni have been closed */
} else
res = -errno;
break;
default :
errno = EOPNOTSUPP;
res = -errno;
break;
}
return (res);
}
#endif /* HAVE_SETXATTR */
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