diff options
Diffstat (limited to 'source3/smbd/dosmode.c')
| -rw-r--r-- | source3/smbd/dosmode.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/source3/smbd/dosmode.c b/source3/smbd/dosmode.c new file mode 100644 index 0000000000..c1af18d80b --- /dev/null +++ b/source3/smbd/dosmode.c @@ -0,0 +1,202 @@ +/* + Unix SMB/Netbios implementation. + Version 1.9. + dos mode handling functions + Copyright (C) Andrew Tridgell 1992-1998 + + This program 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 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; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "includes.h" + +extern int DEBUGLEVEL; + +/**************************************************************************** + change a dos mode to a unix mode + base permission for files: + everybody gets read bit set + dos readonly is represented in unix by removing everyone's write bit + dos archive is represented in unix by the user's execute bit + dos system is represented in unix by the group's execute bit + dos hidden is represented in unix by the other's execute bit + Then apply create mask, + then add force bits. + base permission for directories: + dos directory is represented in unix by unix's dir bit and the exec bit + Then apply create mask, + then add force bits. +****************************************************************************/ +mode_t unix_mode(connection_struct *conn,int dosmode) +{ + mode_t result = (S_IRUSR | S_IRGRP | S_IROTH); + + if ( !IS_DOS_READONLY(dosmode) ) + result |= (S_IWUSR | S_IWGRP | S_IWOTH); + + if (IS_DOS_DIR(dosmode)) { + /* We never make directories read only for the owner as under DOS a user + can always create a file in a read-only directory. */ + result |= (S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH | S_IWUSR); + /* Apply directory mask */ + result &= lp_dir_mode(SNUM(conn)); + /* Add in force bits */ + result |= lp_force_dir_mode(SNUM(conn)); + } else { + if (lp_map_archive(SNUM(conn)) && IS_DOS_ARCHIVE(dosmode)) + result |= S_IXUSR; + + if (lp_map_system(SNUM(conn)) && IS_DOS_SYSTEM(dosmode)) + result |= S_IXGRP; + + if (lp_map_hidden(SNUM(conn)) && IS_DOS_HIDDEN(dosmode)) + result |= S_IXOTH; + + /* Apply mode mask */ + result &= lp_create_mode(SNUM(conn)); + /* Add in force bits */ + result |= lp_force_create_mode(SNUM(conn)); + } + return(result); +} + + +/**************************************************************************** + change a unix mode to a dos mode +****************************************************************************/ +int dos_mode(connection_struct *conn,char *path,struct stat *sbuf) +{ + int result = 0; + extern struct current_user current_user; + + DEBUG(8,("dos_mode: %s\n", path)); + + if (CAN_WRITE(conn) && !lp_alternate_permissions(SNUM(conn))) { + if (!((sbuf->st_mode & S_IWOTH) || + conn->admin_user || + ((sbuf->st_mode & S_IWUSR) && current_user.uid==sbuf->st_uid) || + ((sbuf->st_mode & S_IWGRP) && + in_group(sbuf->st_gid,current_user.gid, + current_user.ngroups,current_user.groups)))) + result |= aRONLY; + } else { + if ((sbuf->st_mode & S_IWUSR) == 0) + result |= aRONLY; + } + + if (MAP_ARCHIVE(conn) && ((sbuf->st_mode & S_IXUSR) != 0)) + result |= aARCH; + + if (MAP_SYSTEM(conn) && ((sbuf->st_mode & S_IXGRP) != 0)) + result |= aSYSTEM; + + if (MAP_HIDDEN(conn) && ((sbuf->st_mode & S_IXOTH) != 0)) + result |= aHIDDEN; + + if (S_ISDIR(sbuf->st_mode)) + result = aDIR | (result & aRONLY); + +#ifdef S_ISLNK +#if LINKS_READ_ONLY + if (S_ISLNK(sbuf->st_mode) && S_ISDIR(sbuf->st_mode)) + result |= aRONLY; +#endif +#endif + + /* hide files with a name starting with a . */ + if (lp_hide_dot_files(SNUM(conn))) + { + char *p = strrchr(path,'/'); + if (p) + p++; + else + p = path; + + if (p[0] == '.' && p[1] != '.' && p[1] != 0) + result |= aHIDDEN; + } + + /* Optimization : Only call is_hidden_path if it's not already + hidden. */ + if (!(result & aHIDDEN) && IS_HIDDEN_PATH(conn,path)) + { + result |= aHIDDEN; + } + + DEBUG(8,("dos_mode returning ")); + + if (result & aHIDDEN) DEBUG(8, ("h")); + if (result & aRONLY ) DEBUG(8, ("r")); + if (result & aSYSTEM) DEBUG(8, ("s")); + if (result & aDIR ) DEBUG(8, ("d")); + if (result & aARCH ) DEBUG(8, ("a")); + + DEBUG(8,("\n")); + + return(result); +} + +/******************************************************************* +chmod a file - but preserve some bits +********************************************************************/ +int dos_chmod(connection_struct *conn,char *fname,int dosmode,struct stat *st) +{ + struct stat st1; + int mask=0; + int tmp; + int unixmode; + + if (!st) { + st = &st1; + if (sys_stat(fname,st)) return(-1); + } + + if (S_ISDIR(st->st_mode)) dosmode |= aDIR; + + if (dos_mode(conn,fname,st) == dosmode) return(0); + + unixmode = unix_mode(conn,dosmode); + + /* preserve the s bits */ + mask |= (S_ISUID | S_ISGID); + + /* preserve the t bit */ +#ifdef S_ISVTX + mask |= S_ISVTX; +#endif + + /* possibly preserve the x bits */ + if (!MAP_ARCHIVE(conn)) mask |= S_IXUSR; + if (!MAP_SYSTEM(conn)) mask |= S_IXGRP; + if (!MAP_HIDDEN(conn)) mask |= S_IXOTH; + + unixmode |= (st->st_mode & mask); + + /* if we previously had any r bits set then leave them alone */ + if ((tmp = st->st_mode & (S_IRUSR|S_IRGRP|S_IROTH))) { + unixmode &= ~(S_IRUSR|S_IRGRP|S_IROTH); + unixmode |= tmp; + } + + /* if we previously had any w bits set then leave them alone + if the new mode is not rdonly */ + if (!IS_DOS_READONLY(dosmode) && + (tmp = st->st_mode & (S_IWUSR|S_IWGRP|S_IWOTH))) { + unixmode &= ~(S_IWUSR|S_IWGRP|S_IWOTH); + unixmode |= tmp; + } + + return(sys_chmod(fname,unixmode)); +} + |