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 ****************************************************************************/
45 mode_t unix_mode(connection_struct *conn,int dosmode,const char *fname)
47 mode_t result = (S_IRUSR | S_IRGRP | S_IROTH);
48 mode_t dir_mode = 0; /* Mode of the parent directory if inheriting. */
50 if ( !IS_DOS_READONLY(dosmode) )
51 result |= (S_IWUSR | S_IWGRP | S_IWOTH);
53 if (fname && lp_inherit_perms(SNUM(conn))) {
57 dname = parent_dirname(fname);
58 DEBUG(2,("unix_mode(%s) inheriting from %s\n",fname,dname));
59 if (vfs_stat(conn,dname,&sbuf) != 0) {
60 DEBUG(4,("unix_mode(%s) failed, [dir %s]: %s\n",fname,dname,strerror(errno)));
61 return(0); /* *** shouldn't happen! *** */
64 /* Save for later - but explicitly remove setuid bit for safety. */
65 dir_mode = sbuf.st_mode & ~S_ISUID;
66 DEBUG(2,("unix_mode(%s) inherit mode %o\n",fname,(int)dir_mode));
71 if (IS_DOS_DIR(dosmode)) {
72 /* We never make directories read only for the owner as under DOS a user
73 can always create a file in a read-only directory. */
74 result |= (S_IFDIR | S_IWUSR);
77 /* Inherit mode of parent directory. */
80 /* Provisionally add all 'x' bits */
81 result |= (S_IXUSR | S_IXGRP | S_IXOTH);
83 /* Apply directory mask */
84 result &= lp_dir_mask(SNUM(conn));
85 /* Add in force bits */
86 result |= lp_force_dir_mode(SNUM(conn));
89 if (lp_map_archive(SNUM(conn)) && IS_DOS_ARCHIVE(dosmode))
92 if (lp_map_system(SNUM(conn)) && IS_DOS_SYSTEM(dosmode))
95 if (lp_map_hidden(SNUM(conn)) && IS_DOS_HIDDEN(dosmode))
99 /* Inherit 666 component of parent directory mode */
101 & (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 ));
115 /****************************************************************************
116 change a unix mode to a dos mode
117 ****************************************************************************/
118 int dos_mode(connection_struct *conn,char *path,SMB_STRUCT_STAT *sbuf)
122 DEBUG(8,("dos_mode: %s\n", path));
124 if ((sbuf->st_mode & S_IWUSR) == 0)
127 if (MAP_ARCHIVE(conn) && ((sbuf->st_mode & S_IXUSR) != 0))
130 if (MAP_SYSTEM(conn) && ((sbuf->st_mode & S_IXGRP) != 0))
133 if (MAP_HIDDEN(conn) && ((sbuf->st_mode & S_IXOTH) != 0))
136 if (S_ISDIR(sbuf->st_mode))
137 result = aDIR | (result & aRONLY);
141 if (S_ISLNK(sbuf->st_mode) && S_ISDIR(sbuf->st_mode))
146 /* hide files with a name starting with a . */
147 if (lp_hide_dot_files(SNUM(conn)))
149 char *p = strrchr_m(path,'/');
155 if (p[0] == '.' && p[1] != '.' && p[1] != 0)
159 /* Optimization : Only call is_hidden_path if it's not already
161 if (!(result & aHIDDEN) && IS_HIDDEN_PATH(conn,path))
166 DEBUG(8,("dos_mode returning "));
168 if (result & aHIDDEN) DEBUG(8, ("h"));
169 if (result & aRONLY ) DEBUG(8, ("r"));
170 if (result & aSYSTEM) DEBUG(8, ("s"));
171 if (result & aDIR ) DEBUG(8, ("d"));
172 if (result & aARCH ) DEBUG(8, ("a"));
179 /*******************************************************************
180 chmod a file - but preserve some bits
181 ********************************************************************/
182 int file_chmod(connection_struct *conn,char *fname,int dosmode,SMB_STRUCT_STAT *st)
192 if (vfs_stat(conn,fname,st))
196 if (S_ISDIR(st->st_mode))
199 if (dos_mode(conn,fname,st) == dosmode)
202 unixmode = unix_mode(conn,dosmode,fname);
204 /* preserve the s bits */
205 mask |= (S_ISUID | S_ISGID);
207 /* preserve the t bit */
212 /* possibly preserve the x bits */
213 if (!MAP_ARCHIVE(conn))
215 if (!MAP_SYSTEM(conn))
217 if (!MAP_HIDDEN(conn))
220 unixmode |= (st->st_mode & mask);
222 /* if we previously had any r bits set then leave them alone */
223 if ((tmp = st->st_mode & (S_IRUSR|S_IRGRP|S_IROTH))) {
224 unixmode &= ~(S_IRUSR|S_IRGRP|S_IROTH);
228 /* if we previously had any w bits set then leave them alone
229 whilst adding in the new w bits, if the new mode is not rdonly */
230 if (!IS_DOS_READONLY(dosmode)) {
231 unixmode |= (st->st_mode & (S_IWUSR|S_IWGRP|S_IWOTH));
234 if ((ret = vfs_chmod(conn,fname,unixmode)) == 0)
237 if((errno != EPERM) && (errno != EACCES))
240 if(!lp_dos_filemode(SNUM(conn)))
243 /* We want DOS semantics, ie allow non owner with write permission to change the
244 bits on a file. Just like file_utime below.
247 /* Check if we have write access. */
248 if (CAN_WRITE(conn)) {
250 * We need to open the file with write access whilst
251 * still in our current user context. This ensures we
252 * are not violating security in doing the fchmod.
253 * This file open does *not* break any oplocks we are
254 * holding. We need to review this.... may need to
255 * break batch oplocks open by others. JRA.
257 files_struct *fsp = open_file_fchmod(conn,fname,st);
261 ret = conn->vfs_ops.fchmod(fsp, fsp->fd, unixmode);
263 close_file_fchmod(fsp);
270 /*******************************************************************
271 Wrapper around dos_utime that possibly allows DOS semantics rather
273 *******************************************************************/
274 int file_utime(connection_struct *conn, char *fname, struct utimbuf *times)
276 extern struct current_user current_user;
282 if(conn->vfs_ops.utime(conn,fname, times) == 0)
285 if((errno != EPERM) && (errno != EACCES))
288 if(!lp_dos_filetimes(SNUM(conn)))
291 /* We have permission (given by the Samba admin) to
292 break POSIX semantics and allow a user to change
293 the time on a file they don't own but can write to
297 if(vfs_stat(conn,fname,&sb) != 0)
300 /* Check if we have write access. */
301 if (CAN_WRITE(conn)) {
302 if (((sb.st_mode & S_IWOTH) ||
304 ((sb.st_mode & S_IWUSR) && current_user.uid==sb.st_uid) ||
305 ((sb.st_mode & S_IWGRP) &&
306 in_group(sb.st_gid,current_user.gid,
307 current_user.ngroups,current_user.groups)))) {
308 /* We are allowed to become root and change the filetime. */
310 ret = conn->vfs_ops.utime(conn,fname, times);
318 /*******************************************************************
319 Change a filetime - possibly allowing DOS semantics.
320 *******************************************************************/
321 BOOL set_filetime(connection_struct *conn, char *fname, time_t mtime)
323 struct utimbuf times;
325 if (null_mtime(mtime)) return(True);
327 times.modtime = times.actime = mtime;
329 if (file_utime(conn, fname, ×)) {
330 DEBUG(4,("set_filetime(%s) failed: %s\n",fname,strerror(errno)));