2 Unix SMB/CIFS implementation.
3 dos mode handling functions
4 Copyright (C) Andrew Tridgell 1992-1998
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 /****************************************************************************
24 Change a dos mode to a unix mode.
25 Base permission for files:
27 apply read/write bits from parent directory.
29 everybody gets read bit set
30 dos readonly is represented in unix by removing everyone's write bit
31 dos archive is represented in unix by the user's execute bit
32 dos system is represented in unix by the group's execute bit
33 dos hidden is represented in unix by the other's execute bit
35 Then apply create mask,
38 Base permission for directories:
39 dos directory is represented in unix by unix's dir bit and the exec bit
41 Then apply create mask,
44 ****************************************************************************/
46 mode_t unix_mode(connection_struct *conn, int dosmode, const char *fname)
48 mode_t result = (S_IRUSR | S_IRGRP | S_IROTH);
49 mode_t dir_mode = 0; /* Mode of the parent directory if inheriting. */
51 if ( !IS_DOS_READONLY(dosmode) )
52 result |= (S_IWUSR | S_IWGRP | S_IWOTH);
54 if (fname && lp_inherit_perms(SNUM(conn))) {
58 dname = parent_dirname(fname);
59 DEBUG(2,("unix_mode(%s) inheriting from %s\n",fname,dname));
60 if (SMB_VFS_STAT(conn,dname,&sbuf) != 0) {
61 DEBUG(4,("unix_mode(%s) failed, [dir %s]: %s\n",fname,dname,strerror(errno)));
62 return(0); /* *** shouldn't happen! *** */
65 /* Save for later - but explicitly remove setuid bit for safety. */
66 dir_mode = sbuf.st_mode & ~S_ISUID;
67 DEBUG(2,("unix_mode(%s) inherit mode %o\n",fname,(int)dir_mode));
72 if (IS_DOS_DIR(dosmode)) {
73 /* We never make directories read only for the owner as under DOS a user
74 can always create a file in a read-only directory. */
75 result |= (S_IFDIR | S_IWUSR);
78 /* Inherit mode of parent directory. */
81 /* Provisionally add all 'x' bits */
82 result |= (S_IXUSR | S_IXGRP | S_IXOTH);
84 /* Apply directory mask */
85 result &= lp_dir_mask(SNUM(conn));
86 /* Add in force bits */
87 result |= lp_force_dir_mode(SNUM(conn));
90 if (lp_map_archive(SNUM(conn)) && IS_DOS_ARCHIVE(dosmode))
93 if (lp_map_system(SNUM(conn)) && IS_DOS_SYSTEM(dosmode))
96 if (lp_map_hidden(SNUM(conn)) && IS_DOS_HIDDEN(dosmode))
100 /* Inherit 666 component of parent directory mode */
101 result |= dir_mode & (S_IRUSR | S_IRGRP | S_IROTH | S_IWUSR | S_IWGRP | S_IWOTH);
103 /* Apply mode mask */
104 result &= lp_create_mask(SNUM(conn));
105 /* Add in force bits */
106 result |= lp_force_create_mode(SNUM(conn));
110 DEBUG(3,("unix_mode(%s) returning 0%o\n",fname,(int)result ));
114 /****************************************************************************
115 Change a unix mode to a dos mode.
116 ****************************************************************************/
118 uint32 dos_mode_from_sbuf(connection_struct *conn, SMB_STRUCT_STAT *sbuf)
122 if ((sbuf->st_mode & S_IWUSR) == 0)
125 if (MAP_ARCHIVE(conn) && ((sbuf->st_mode & S_IXUSR) != 0))
128 if (MAP_SYSTEM(conn) && ((sbuf->st_mode & S_IXGRP) != 0))
131 if (MAP_HIDDEN(conn) && ((sbuf->st_mode & S_IXOTH) != 0))
134 if (S_ISDIR(sbuf->st_mode))
135 result = aDIR | (result & aRONLY);
137 #if defined (HAVE_STAT_ST_BLOCKS) && defined (HAVE_STAT_ST_BLKSIZE)
138 if (sbuf->st_size > sbuf->st_blocks * (SMB_OFF_T)sbuf->st_blksize) {
139 result |= FILE_ATTRIBUTE_SPARSE;
145 if (S_ISLNK(sbuf->st_mode) && S_ISDIR(sbuf->st_mode))
150 DEBUG(8,("dos_mode_from_sbuf returning "));
152 if (result & aHIDDEN) DEBUG(8, ("h"));
153 if (result & aRONLY ) DEBUG(8, ("r"));
154 if (result & aSYSTEM) DEBUG(8, ("s"));
155 if (result & aDIR ) DEBUG(8, ("d"));
156 if (result & aARCH ) DEBUG(8, ("a"));
162 /****************************************************************************
163 Change a unix mode to a dos mode.
164 ****************************************************************************/
166 uint32 dos_mode(connection_struct *conn,char *path,SMB_STRUCT_STAT *sbuf)
170 DEBUG(8,("dos_mode: %s\n", path));
172 result = dos_mode_from_sbuf(conn, sbuf);
174 /* Now do any modifications that depend on the path name. */
175 /* hide files with a name starting with a . */
176 if (lp_hide_dot_files(SNUM(conn))) {
177 char *p = strrchr_m(path,'/');
183 if (p[0] == '.' && p[1] != '.' && p[1] != 0)
187 /* Optimization : Only call is_hidden_path if it's not already
189 if (!(result & aHIDDEN) && IS_HIDDEN_PATH(conn,path)) {
193 DEBUG(8,("dos_mode returning "));
195 if (result & aHIDDEN) DEBUG(8, ("h"));
196 if (result & aRONLY ) DEBUG(8, ("r"));
197 if (result & aSYSTEM) DEBUG(8, ("s"));
198 if (result & aDIR ) DEBUG(8, ("d"));
199 if (result & aARCH ) DEBUG(8, ("a"));
206 /*******************************************************************
207 chmod a file - but preserve some bits.
208 ********************************************************************/
210 int file_chmod(connection_struct *conn,char *fname, uint32 dosmode,SMB_STRUCT_STAT *st)
220 if (SMB_VFS_STAT(conn,fname,st))
224 get_acl_group_bits(conn, fname, &st->st_mode);
226 if (S_ISDIR(st->st_mode))
231 if (dos_mode(conn,fname,st) == dosmode)
234 unixmode = unix_mode(conn,dosmode,fname);
236 /* preserve the s bits */
237 mask |= (S_ISUID | S_ISGID);
239 /* preserve the t bit */
244 /* possibly preserve the x bits */
245 if (!MAP_ARCHIVE(conn))
247 if (!MAP_SYSTEM(conn))
249 if (!MAP_HIDDEN(conn))
252 unixmode |= (st->st_mode & mask);
254 /* if we previously had any r bits set then leave them alone */
255 if ((tmp = st->st_mode & (S_IRUSR|S_IRGRP|S_IROTH))) {
256 unixmode &= ~(S_IRUSR|S_IRGRP|S_IROTH);
260 /* if we previously had any w bits set then leave them alone
261 whilst adding in the new w bits, if the new mode is not rdonly */
262 if (!IS_DOS_READONLY(dosmode)) {
263 unixmode |= (st->st_mode & (S_IWUSR|S_IWGRP|S_IWOTH));
266 if ((ret = SMB_VFS_CHMOD(conn,fname,unixmode)) == 0)
269 if((errno != EPERM) && (errno != EACCES))
272 if(!lp_dos_filemode(SNUM(conn)))
275 /* We want DOS semantics, ie allow non owner with write permission to change the
276 bits on a file. Just like file_utime below.
279 /* Check if we have write access. */
280 if (CAN_WRITE(conn)) {
282 * We need to open the file with write access whilst
283 * still in our current user context. This ensures we
284 * are not violating security in doing the fchmod.
285 * This file open does *not* break any oplocks we are
286 * holding. We need to review this.... may need to
287 * break batch oplocks open by others. JRA.
289 files_struct *fsp = open_file_fchmod(conn,fname,st);
293 ret = SMB_VFS_FCHMOD(fsp, fsp->fd, unixmode);
295 close_file_fchmod(fsp);
301 /*******************************************************************
302 Wrapper around dos_utime that possibly allows DOS semantics rather
304 *******************************************************************/
306 int file_utime(connection_struct *conn, char *fname, struct utimbuf *times)
308 extern struct current_user current_user;
314 if(SMB_VFS_UTIME(conn,fname, times) == 0)
317 if((errno != EPERM) && (errno != EACCES))
320 if(!lp_dos_filetimes(SNUM(conn)))
323 /* We have permission (given by the Samba admin) to
324 break POSIX semantics and allow a user to change
325 the time on a file they don't own but can write to
329 if(SMB_VFS_STAT(conn,fname,&sb) != 0)
332 /* Check if we have write access. */
333 if (CAN_WRITE(conn)) {
334 if (((sb.st_mode & S_IWOTH) || conn->admin_user ||
335 ((sb.st_mode & S_IWUSR) && current_user.uid==sb.st_uid) ||
336 ((sb.st_mode & S_IWGRP) &&
337 in_group(sb.st_gid,current_user.gid,
338 current_user.ngroups,current_user.groups)))) {
339 /* We are allowed to become root and change the filetime. */
341 ret = SMB_VFS_UTIME(conn,fname, times);
349 /*******************************************************************
350 Change a filetime - possibly allowing DOS semantics.
351 *******************************************************************/
353 BOOL set_filetime(connection_struct *conn, char *fname, time_t mtime)
355 struct utimbuf times;
357 if (null_mtime(mtime))
360 times.modtime = times.actime = mtime;
362 if (file_utime(conn, fname, ×)) {
363 DEBUG(4,("set_filetime(%s) failed: %s\n",fname,strerror(errno)));