mirror of https://github.com/mpartel/bindfs.git
1330 lines
38 KiB
C
1330 lines
38 KiB
C
/*
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Copyright 2006,2007,2008,2009,2010 Martin Pärtel <martin.partel@gmail.com>
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This file is part of bindfs.
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bindfs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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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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bindfs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with bindfs. If not, see <http://www.gnu.org/licenses/>.
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This file is based on fusexmp_fh.c from FUSE 2.5.3,
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which had the following notice:
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---
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FUSE: Filesystem in Userspace
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Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu>
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This program can be distributed under the terms of the GNU GPL.
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See the file COPYING.
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---
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*/
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#include <config.h>
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/* For pread/pwrite */
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#define _XOPEN_SOURCE 500
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#include <stdlib.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#include <sys/statvfs.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <errno.h>
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#include <getopt.h>
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#include <assert.h>
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#include <pwd.h>
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#include <grp.h>
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#ifdef HAVE_SETXATTR
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#include <sys/xattr.h>
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#endif
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#include <fuse.h>
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#include <fuse_opt.h>
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#include "debug.h"
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#include "permchain.h"
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#include "userinfo.h"
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#include "misc.h"
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/* SETTINGS */
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static struct settings {
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const char *progname;
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struct permchain *permchain; /* permission bit rules. see permchain.h */
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uid_t new_uid; /* user-specified uid */
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gid_t new_gid; /* user-specified gid */
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uid_t create_for_uid;
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gid_t create_for_gid;
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const char *mntsrc;
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const char *mntdest;
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int mntsrc_fd;
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enum CreatePolicy {
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CREATE_AS_USER,
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CREATE_AS_MOUNTER
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} create_policy;
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struct permchain *create_permchain; /* the --create-with-perms option */
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enum ChownPolicy {
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CHOWN_NORMAL,
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CHOWN_IGNORE,
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CHOWN_DENY
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} chown_policy;
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enum ChgrpPolicy {
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CHGRP_NORMAL,
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CHGRP_IGNORE,
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CHGRP_DENY
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} chgrp_policy;
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enum ChmodPolicy {
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CHMOD_NORMAL,
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CHMOD_IGNORE,
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CHMOD_DENY
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} chmod_policy;
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int chmod_allow_x;
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enum XAttrPolicy {
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XATTR_UNIMPLEMENTED,
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XATTR_READ_ONLY,
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XATTR_READ_WRITE
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} xattr_policy;
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int mirrored_users_only;
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uid_t* mirrored_users;
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int num_mirrored_users;
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gid_t *mirrored_members;
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int num_mirrored_members;
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int ctime_from_mtime;
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} settings;
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/* PROTOTYPES */
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static int is_mirroring_enabled();
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/* Checks whether the uid is to be the mirrored owner of all files. */
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static int is_mirrored_user(uid_t uid);
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/* Processes the virtual path to a real path. Don't free() the result. */
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static const char *process_path(const char *path);
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/* The common parts of getattr and fgetattr */
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static int getattr_common(const char *path, struct stat *stbuf);
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/* FUSE callbacks */
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static void *bindfs_init();
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static void bindfs_destroy(void *private_data);
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static int bindfs_getattr(const char *path, struct stat *stbuf);
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static int bindfs_fgetattr(const char *path, struct stat *stbuf,
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struct fuse_file_info *fi);
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static int bindfs_readlink(const char *path, char *buf, size_t size);
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static int bindfs_opendir(const char *path, struct fuse_file_info *fi);
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static inline DIR *get_dirp(struct fuse_file_info *fi);
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static int bindfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
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off_t offset, struct fuse_file_info *fi);
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static int bindfs_releasedir(const char *path, struct fuse_file_info *fi);
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static int bindfs_mknod(const char *path, mode_t mode, dev_t rdev);
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static int bindfs_mkdir(const char *path, mode_t mode);
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static int bindfs_unlink(const char *path);
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static int bindfs_rmdir(const char *path);
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static int bindfs_symlink(const char *from, const char *to);
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static int bindfs_rename(const char *from, const char *to);
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static int bindfs_link(const char *from, const char *to);
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static int bindfs_chmod(const char *path, mode_t mode);
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static int bindfs_chown(const char *path, uid_t uid, gid_t gid);
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static int bindfs_truncate(const char *path, off_t size);
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static int bindfs_ftruncate(const char *path, off_t size,
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struct fuse_file_info *fi);
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static int bindfs_utime(const char *path, struct utimbuf *buf);
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static int bindfs_create(const char *path, mode_t mode, struct fuse_file_info *fi);
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static int bindfs_open(const char *path, struct fuse_file_info *fi);
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static int bindfs_read(const char *path, char *buf, size_t size, off_t offset,
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struct fuse_file_info *fi);
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static int bindfs_write(const char *path, const char *buf, size_t size,
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off_t offset, struct fuse_file_info *fi);
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static int bindfs_statfs(const char *path, struct statvfs *stbuf);
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static int bindfs_release(const char *path, struct fuse_file_info *fi);
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static int bindfs_fsync(const char *path, int isdatasync,
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struct fuse_file_info *fi);
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static void print_usage(const char *progname);
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static void atexit_func();
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static int process_option(void *data, const char *arg, int key,
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struct fuse_args *outargs);
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static int is_mirroring_enabled()
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{
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return settings.num_mirrored_users + settings.num_mirrored_members > 0;
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}
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static int is_mirrored_user(uid_t uid)
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{
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int i;
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for (i = 0; i < settings.num_mirrored_users; ++i) {
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if (settings.mirrored_users[i] == uid)
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break;
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}
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if (i < settings.num_mirrored_users) { /* found in mirrored_users */
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return 1;
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} else {
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for (i = 0; i < settings.num_mirrored_members; ++i) {
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if (user_belongs_to_group(uid, settings.mirrored_members[i]))
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break;
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}
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if (i < settings.num_mirrored_members) /* found in mirrored_members */
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return 1;
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}
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return 0;
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}
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static const char *process_path(const char *path)
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{
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if (path == NULL) /* possible? */
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return NULL;
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while (*path == '/')
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++path;
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if (*path == '\0')
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return ".";
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else
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return path;
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}
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static int getattr_common(const char *procpath, struct stat *stbuf)
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{
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struct fuse_context *fc = fuse_get_context();
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/* Copy mtime (file content modification time)
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to ctime (inode/status change time)
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if the user asked for that */
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if (settings.ctime_from_mtime)
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stbuf->st_ctime = stbuf->st_mtime;
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/* Report user-defined owner/group if specified */
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if (settings.new_uid != -1)
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stbuf->st_uid = settings.new_uid;
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if (settings.new_gid != -1)
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stbuf->st_gid = settings.new_gid;
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/* Mirrored user? */
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if (is_mirroring_enabled() && is_mirrored_user(fc->uid)) {
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stbuf->st_uid = fc->uid;
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} else if (settings.mirrored_users_only && fc->uid != 0) {
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stbuf->st_mode &= ~0777; /* Deny all access if mirror-only and not root */
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return 0;
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}
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if ((stbuf->st_mode & S_IFLNK) == S_IFLNK)
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return 0; /* don't bother with symlink permissions -- they don't matter */
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/* Apply user-defined permission bit modifications */
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stbuf->st_mode = permchain_apply(settings.permchain, stbuf->st_mode);
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/* Check that we can really do what we promise */
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if (access(procpath, R_OK) == -1)
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stbuf->st_mode &= ~0444;
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if (access(procpath, W_OK) == -1)
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stbuf->st_mode &= ~0222;
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if (access(procpath, X_OK) == -1)
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stbuf->st_mode &= ~0111;
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return 0;
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}
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static void *bindfs_init()
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{
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assert(settings.permchain != NULL);
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assert(settings.mntsrc_fd > 0);
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if (fchdir(settings.mntsrc_fd) != 0) {
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fprintf(
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stderr,
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"Could not change working directory to '%s': %s\n",
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settings.mntsrc,
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strerror(errno)
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);
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fuse_exit(fuse_get_context()->fuse);
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}
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return NULL;
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}
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static void bindfs_destroy(void *private_data)
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{
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}
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static int bindfs_getattr(const char *path, struct stat *stbuf)
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{
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path = process_path(path);
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if (lstat(path, stbuf) == -1)
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return -errno;
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return getattr_common(path, stbuf);
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}
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static int bindfs_fgetattr(const char *path, struct stat *stbuf,
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struct fuse_file_info *fi)
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{
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path = process_path(path);
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if (fstat(fi->fh, stbuf) == -1)
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return -errno;
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return getattr_common(path, stbuf);
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}
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static int bindfs_readlink(const char *path, char *buf, size_t size)
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{
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int res;
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path = process_path(path);
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/* No need to check for access to the link itself, since symlink
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permissions don't matter. Access to the path components of the symlink
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are automatically queried by FUSE. */
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res = readlink(path, buf, size - 1);
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if (res == -1)
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return -errno;
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buf[res] = '\0';
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return 0;
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}
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static int bindfs_opendir(const char *path, struct fuse_file_info *fi)
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{
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DIR *dp;
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path = process_path(path);
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dp = opendir(path);
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if (dp == NULL)
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return -errno;
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fi->fh = (unsigned long) dp;
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return 0;
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}
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static inline DIR *get_dirp(struct fuse_file_info *fi)
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{
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return (DIR *) (uintptr_t) fi->fh;
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}
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static int bindfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
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off_t offset, struct fuse_file_info *fi)
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{
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DIR *dp = get_dirp(fi);
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struct dirent *de;
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(void) path;
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seekdir(dp, offset);
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while ((de = readdir(dp)) != NULL) {
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struct stat st;
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memset(&st, 0, sizeof(st));
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st.st_ino = de->d_ino;
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st.st_mode = de->d_type << 12;
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if (filler(buf, de->d_name, &st, telldir(dp)))
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break;
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}
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return 0;
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}
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static int bindfs_releasedir(const char *path, struct fuse_file_info *fi)
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{
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DIR *dp = get_dirp(fi);
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(void) path;
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closedir(dp);
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return 0;
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}
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static int bindfs_mknod(const char *path, mode_t mode, dev_t rdev)
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{
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int res;
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struct fuse_context *fc;
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uid_t file_owner = -1;
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gid_t file_group = -1;
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path = process_path(path);
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mode = permchain_apply(settings.create_permchain, mode);
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if (S_ISFIFO(mode))
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res = mkfifo(path, mode);
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else
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res = mknod(path, mode, rdev);
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if (res == -1)
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return -errno;
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if (settings.create_policy == CREATE_AS_USER) {
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fc = fuse_get_context();
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file_owner = fc->uid;
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file_group = fc->gid;
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}
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if (settings.create_for_uid != -1)
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file_owner = settings.create_for_uid;
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if (settings.create_for_gid != -1)
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file_group = settings.create_for_gid;
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if ((file_owner != -1) || (file_group != -1)) {
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if (chown(path, file_owner, file_group) == -1) {
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DPRINTF("Failed to chown new device node (%d)", errno);
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}
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}
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return 0;
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}
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static int bindfs_mkdir(const char *path, mode_t mode)
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{
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int res;
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struct fuse_context *fc;
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uid_t file_owner = -1;
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gid_t file_group = -1;
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path = process_path(path);
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mode |= S_IFDIR; /* tell permchain_apply this is a directory */
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mode = permchain_apply(settings.create_permchain, mode);
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res = mkdir(path, mode & 0777);
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if (res == -1)
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return -errno;
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if (settings.create_policy == CREATE_AS_USER) {
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fc = fuse_get_context();
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file_owner = fc->uid;
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file_group = fc->gid;
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}
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if (settings.create_for_uid != -1)
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file_owner = settings.create_for_uid;
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if (settings.create_for_gid != -1)
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file_group = settings.create_for_gid;
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if ((file_owner != -1) || (file_group != -1)) {
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if (chown(path, file_owner, file_group) == -1) {
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DPRINTF("Failed to chown new directory (%d)", errno);
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}
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}
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return 0;
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}
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static int bindfs_unlink(const char *path)
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{
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int res;
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path = process_path(path);
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res = unlink(path);
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if (res == -1)
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return -errno;
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return 0;
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}
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static int bindfs_rmdir(const char *path)
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{
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int res;
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path = process_path(path);
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res = rmdir(path);
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if (res == -1)
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return -errno;
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return 0;
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}
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static int bindfs_symlink(const char *from, const char *to)
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{
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int res;
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struct fuse_context *fc;
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uid_t file_owner = -1;
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gid_t file_group = -1;
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to = process_path(to);
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res = symlink(from, to);
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if (res == -1)
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return -errno;
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if (settings.create_policy == CREATE_AS_USER) {
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fc = fuse_get_context();
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file_owner = fc->uid;
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file_group = fc->gid;
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}
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if (settings.create_for_uid != -1)
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file_owner = settings.create_for_uid;
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if (settings.create_for_gid != -1)
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file_group = settings.create_for_gid;
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if ((file_owner != -1) || (file_group != -1)) {
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if (lchown(to, file_owner, file_group) == -1) {
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DPRINTF("Failed to lchown new symlink (%d)", errno);
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}
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}
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return 0;
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}
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static int bindfs_rename(const char *from, const char *to)
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{
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int res;
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from = process_path(from);
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to = process_path(to);
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res = rename(from, to);
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if (res == -1)
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return -errno;
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return 0;
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}
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static int bindfs_link(const char *from, const char *to)
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{
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int res;
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from = process_path(from);
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to = process_path(to);
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res = link(from, to);
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if (res == -1)
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return -errno;
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return 0;
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}
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static int bindfs_chmod(const char *path, mode_t mode)
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{
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int file_execute_only = 0;
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struct stat st;
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mode_t diff = 0;
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path = process_path(path);
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if (settings.chmod_allow_x) {
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/* Get the old permission bits and see which bits would change. */
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if (lstat(path, &st) == -1)
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return -errno;
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if (S_ISREG(st.st_mode)) {
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diff = (st.st_mode & 07777) ^ (mode & 07777);
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file_execute_only = 1;
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|
}
|
|
}
|
|
|
|
switch (settings.chmod_policy) {
|
|
case CHMOD_NORMAL:
|
|
if (chmod(path, mode) == -1)
|
|
return -errno;
|
|
return 0;
|
|
case CHMOD_IGNORE:
|
|
if (file_execute_only) {
|
|
diff &= 00111; /* See which execute bits were flipped.
|
|
Forget about other differences. */
|
|
if (chmod(path, st.st_mode ^ diff) == -1)
|
|
return -errno;
|
|
}
|
|
return 0;
|
|
case CHMOD_DENY:
|
|
if (file_execute_only) {
|
|
if ((diff & 07666) == 0) {
|
|
/* Only execute bits have changed, so we can allow this. */
|
|
if (chmod(path, mode) == -1)
|
|
return -errno;
|
|
return 0;
|
|
}
|
|
}
|
|
return -EPERM;
|
|
default:
|
|
assert(0);
|
|
}
|
|
}
|
|
|
|
static int bindfs_chown(const char *path, uid_t uid, gid_t gid)
|
|
{
|
|
int res;
|
|
|
|
if (uid != -1) {
|
|
switch (settings.chown_policy) {
|
|
case CHOWN_NORMAL:
|
|
break;
|
|
case CHOWN_IGNORE:
|
|
uid = -1;
|
|
break;
|
|
case CHOWN_DENY:
|
|
return -EPERM;
|
|
}
|
|
}
|
|
|
|
if (gid != -1) {
|
|
switch (settings.chgrp_policy) {
|
|
case CHGRP_NORMAL:
|
|
break;
|
|
case CHGRP_IGNORE:
|
|
gid = -1;
|
|
break;
|
|
case CHGRP_DENY:
|
|
return -EPERM;
|
|
}
|
|
}
|
|
|
|
if (uid != -1 || gid != -1) {
|
|
path = process_path(path);
|
|
res = lchown(path, uid, gid);
|
|
if (res == -1)
|
|
return -errno;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bindfs_truncate(const char *path, off_t size)
|
|
{
|
|
int res;
|
|
|
|
path = process_path(path);
|
|
|
|
res = truncate(path, size);
|
|
if (res == -1)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bindfs_ftruncate(const char *path, off_t size,
|
|
struct fuse_file_info *fi)
|
|
{
|
|
int res;
|
|
|
|
(void) path;
|
|
|
|
res = ftruncate(fi->fh, size);
|
|
if (res == -1)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bindfs_utime(const char *path, struct utimbuf *buf)
|
|
{
|
|
int res;
|
|
|
|
path = process_path(path);
|
|
|
|
res = utime(path, buf);
|
|
if (res == -1)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bindfs_create(const char *path, mode_t mode, struct fuse_file_info *fi)
|
|
{
|
|
int fd;
|
|
struct fuse_context *fc;
|
|
uid_t file_owner = -1;
|
|
gid_t file_group = -1;
|
|
|
|
path = process_path(path);
|
|
|
|
mode |= S_IFREG; /* tell permchain_apply this is a regular file */
|
|
mode = permchain_apply(settings.create_permchain, mode);
|
|
|
|
fd = open(path, fi->flags, mode & 0777);
|
|
if (fd == -1)
|
|
return -errno;
|
|
|
|
if (settings.create_policy == CREATE_AS_USER) {
|
|
fc = fuse_get_context();
|
|
file_owner = fc->uid;
|
|
file_group = fc->gid;
|
|
}
|
|
|
|
if (settings.create_for_uid != -1)
|
|
file_owner = settings.create_for_uid;
|
|
if (settings.create_for_gid != -1)
|
|
file_group = settings.create_for_gid;
|
|
|
|
if ((file_owner != -1) || (file_group != -1)) {
|
|
if (chown(path, file_owner, file_group) == -1) {
|
|
DPRINTF("Failed to chown new file (%d)", errno);
|
|
}
|
|
}
|
|
|
|
fi->fh = fd;
|
|
return 0;
|
|
}
|
|
|
|
static int bindfs_open(const char *path, struct fuse_file_info *fi)
|
|
{
|
|
int fd;
|
|
|
|
path = process_path(path);
|
|
|
|
fd = open(path, fi->flags);
|
|
if (fd == -1)
|
|
return -errno;
|
|
|
|
fi->fh = fd;
|
|
return 0;
|
|
}
|
|
|
|
static int bindfs_read(const char *path, char *buf, size_t size, off_t offset,
|
|
struct fuse_file_info *fi)
|
|
{
|
|
int res;
|
|
|
|
(void) path;
|
|
res = pread(fi->fh, buf, size, offset);
|
|
if (res == -1)
|
|
res = -errno;
|
|
|
|
return res;
|
|
}
|
|
|
|
static int bindfs_write(const char *path, const char *buf, size_t size,
|
|
off_t offset, struct fuse_file_info *fi)
|
|
{
|
|
int res;
|
|
|
|
(void) path;
|
|
res = pwrite(fi->fh, buf, size, offset);
|
|
if (res == -1)
|
|
res = -errno;
|
|
|
|
return res;
|
|
}
|
|
|
|
static int bindfs_statfs(const char *path, struct statvfs *stbuf)
|
|
{
|
|
int res;
|
|
|
|
path = process_path(path);
|
|
|
|
res = statvfs(path, stbuf);
|
|
if (res == -1)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bindfs_release(const char *path, struct fuse_file_info *fi)
|
|
{
|
|
(void) path;
|
|
close(fi->fh);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bindfs_fsync(const char *path, int isdatasync,
|
|
struct fuse_file_info *fi)
|
|
{
|
|
int res;
|
|
(void) path;
|
|
|
|
#ifndef HAVE_FDATASYNC
|
|
(void) isdatasync;
|
|
#else
|
|
if (isdatasync)
|
|
res = fdatasync(fi->fh);
|
|
else
|
|
#endif
|
|
res = fsync(fi->fh);
|
|
if (res == -1)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef HAVE_SETXATTR
|
|
/* If HAVE_L*XATTR is not defined, we assume Mac/BSD -style *xattr() */
|
|
|
|
static int bindfs_setxattr(const char *path, const char *name, const char *value,
|
|
size_t size, int flags)
|
|
{
|
|
DPRINTF("setxattr %s %s=%s", path, name, value);
|
|
|
|
if (settings.xattr_policy == XATTR_READ_ONLY)
|
|
return -EACCES;
|
|
|
|
/* fuse checks permissions for us */
|
|
path = process_path(path);
|
|
#ifdef HAVE_LSETXATTR
|
|
if (lsetxattr(path, name, value, size, flags) == -1)
|
|
#else
|
|
if (setxattr(path, name, value, size, 0, flags | XATTR_NOFOLLOW) == -1)
|
|
#endif
|
|
return -errno;
|
|
return 0;
|
|
}
|
|
|
|
static int bindfs_getxattr(const char *path, const char *name, char *value,
|
|
size_t size)
|
|
{
|
|
int res;
|
|
|
|
DPRINTF("getxattr %s %s", path, name);
|
|
|
|
path = process_path(path);
|
|
/* fuse checks permissions for us */
|
|
#ifdef HAVE_LGETXATTR
|
|
res = lgetxattr(path, name, value, size);
|
|
#else
|
|
res = getxattr(path, name, value, size, 0, XATTR_NOFOLLOW);
|
|
#endif
|
|
if (res == -1)
|
|
return -errno;
|
|
return res;
|
|
}
|
|
|
|
static int bindfs_listxattr(const char *path, char *list, size_t size)
|
|
{
|
|
int res;
|
|
|
|
DPRINTF("listxattr %s", path);
|
|
|
|
path = process_path(path);
|
|
/* fuse checks permissions for us */
|
|
#ifdef HAVE_LLISTXATTR
|
|
res = llistxattr(path, list, size);
|
|
#else
|
|
res = listxattr(path, list, size, XATTR_NOFOLLOW);
|
|
#endif
|
|
if (res == -1)
|
|
return -errno;
|
|
return res;
|
|
}
|
|
|
|
static int bindfs_removexattr(const char *path, const char *name)
|
|
{
|
|
DPRINTF("removexattr %s %s", path, name);
|
|
|
|
if (settings.xattr_policy == XATTR_READ_ONLY)
|
|
return -EACCES;
|
|
|
|
path = process_path(path);
|
|
/* fuse checks permissions for us */
|
|
#ifdef HAVE_LREMOVEXATTR
|
|
if (lremovexattr(path, name) == -1)
|
|
#else
|
|
if (removexattr(path, name, XATTR_NOFOLLOW) == -1)
|
|
#endif
|
|
return -errno;
|
|
return 0;
|
|
}
|
|
#endif /* HAVE_SETXATTR */
|
|
|
|
|
|
static struct fuse_operations bindfs_oper = {
|
|
.init = bindfs_init,
|
|
.destroy = bindfs_destroy,
|
|
.getattr = bindfs_getattr,
|
|
.fgetattr = bindfs_fgetattr,
|
|
/* no access() since we always use -o default_permissions */
|
|
.readlink = bindfs_readlink,
|
|
.opendir = bindfs_opendir,
|
|
.readdir = bindfs_readdir,
|
|
.releasedir = bindfs_releasedir,
|
|
.mknod = bindfs_mknod,
|
|
.mkdir = bindfs_mkdir,
|
|
.symlink = bindfs_symlink,
|
|
.unlink = bindfs_unlink,
|
|
.rmdir = bindfs_rmdir,
|
|
.rename = bindfs_rename,
|
|
.link = bindfs_link,
|
|
.chmod = bindfs_chmod,
|
|
.chown = bindfs_chown,
|
|
.truncate = bindfs_truncate,
|
|
.ftruncate = bindfs_ftruncate,
|
|
.utime = bindfs_utime,
|
|
.create = bindfs_create,
|
|
.open = bindfs_open,
|
|
.read = bindfs_read,
|
|
.write = bindfs_write,
|
|
.statfs = bindfs_statfs,
|
|
.release = bindfs_release,
|
|
.fsync = bindfs_fsync,
|
|
#ifdef HAVE_SETXATTR
|
|
.setxattr = bindfs_setxattr,
|
|
.getxattr = bindfs_getxattr,
|
|
.listxattr = bindfs_listxattr,
|
|
.removexattr= bindfs_removexattr,
|
|
#endif
|
|
};
|
|
|
|
static void print_usage(const char *progname)
|
|
{
|
|
if (progname == NULL)
|
|
progname = "bindfs";
|
|
|
|
printf("\n"
|
|
"Usage: %s [options] dir mountpoint\n"
|
|
"Information:\n"
|
|
" -h --help Print this and exit.\n"
|
|
" -V --version Print version number and exit.\n"
|
|
"\n"
|
|
"Options:\n"
|
|
" -u --user, --owner Set file owner.\n"
|
|
" -g --group Set file group.\n"
|
|
" -m --mirror Comma-separated list of users who will see\n"
|
|
" themselves as the owners of all files.\n"
|
|
" -M --mirror-only Like --mirror but disallow access for\n"
|
|
" all other users.\n"
|
|
" -n --no-allow-other Do not add -o allow_other to fuse options.\n"
|
|
"\n"
|
|
"Permission bits:\n"
|
|
" -p --perms Specify permissions, similar to chmod\n"
|
|
" e.g. og-x,og+rD,u=rwX,g+rw or 0644,a+X\n"
|
|
"\n"
|
|
"File creation policy:\n"
|
|
" --create-as-user New files owned by creator (default for root). *\n"
|
|
" --create-as-mounter New files owned by fs mounter (default for users).\n"
|
|
" --create-for-user New files owned by specified user. *\n"
|
|
" --create-for-group New files owned by specified group. *\n"
|
|
" --create-with-perms Alter permissions of new files.\n"
|
|
"\n"
|
|
"Chown policy:\n"
|
|
" --chown-normal Try to chown the original files (the default).\n"
|
|
" --chown-ignore Have all chowns fail silently.\n"
|
|
" --chown-deny Have all chowns fail with 'permission denied'.\n"
|
|
"\n"
|
|
"Chgrp policy:\n"
|
|
" --chgrp-normal Try to chgrp the original files (the default).\n"
|
|
" --chgrp-ignore Have all chgrps fail silently.\n"
|
|
" --chgrp-deny Have all chgrps fail with 'permission denied'.\n"
|
|
"\n"
|
|
"Chmod policy:\n"
|
|
" --chmod-normal Try to chmod the original files (the default).\n"
|
|
" --chmod-ignore Have all chmods fail silently.\n"
|
|
" --chmod-deny Have all chmods fail with 'permission denied'.\n"
|
|
" --chmod-allow-x Allow changing file execute bits in any case.\n"
|
|
"\n"
|
|
"Extended attribute policy:\n"
|
|
" --xattr-none Do not implement xattr operations.\n"
|
|
" --xattr-ro Read-only xattr operations.\n"
|
|
" --xattr-rw Read-write xattr operations (the default).\n"
|
|
"\n"
|
|
"Time-related:\n"
|
|
" --ctime-from-mtime Read file properties' change time\n"
|
|
" from file content modification time.\n"
|
|
"\n"
|
|
"FUSE options:\n"
|
|
" -o opt[,opt,...] Mount options.\n"
|
|
" -r -o ro Mount strictly read-only.\n"
|
|
" -d -o debug Enable debug output (implies -f).\n"
|
|
" -f Foreground operation.\n"
|
|
" -s Disable multithreaded operation.\n"
|
|
"\n"
|
|
"(*: root only)\n"
|
|
"\n",
|
|
progname);
|
|
}
|
|
|
|
|
|
static void atexit_func()
|
|
{
|
|
permchain_destroy(settings.permchain);
|
|
settings.permchain = NULL;
|
|
permchain_destroy(settings.create_permchain);
|
|
settings.create_permchain = NULL;
|
|
free(settings.mirrored_users);
|
|
settings.mirrored_users = NULL;
|
|
free(settings.mirrored_members);
|
|
settings.mirrored_members = NULL;
|
|
}
|
|
|
|
enum OptionKey {
|
|
OPTKEY_NONOPTION = -2,
|
|
OPTKEY_UNKNOWN = -1,
|
|
OPTKEY_HELP,
|
|
OPTKEY_VERSION,
|
|
OPTKEY_CREATE_AS_USER,
|
|
OPTKEY_CREATE_AS_MOUNTER,
|
|
OPTKEY_CHOWN_NORMAL,
|
|
OPTKEY_CHOWN_IGNORE,
|
|
OPTKEY_CHOWN_DENY,
|
|
OPTKEY_CHGRP_NORMAL,
|
|
OPTKEY_CHGRP_IGNORE,
|
|
OPTKEY_CHGRP_DENY,
|
|
OPTKEY_CHMOD_NORMAL,
|
|
OPTKEY_CHMOD_IGNORE,
|
|
OPTKEY_CHMOD_DENY,
|
|
OPTKEY_CHMOD_ALLOW_X,
|
|
OPTKEY_XATTR_NONE,
|
|
OPTKEY_XATTR_READ_ONLY,
|
|
OPTKEY_XATTR_READ_WRITE,
|
|
OPTKEY_CTIME_FROM_MTIME
|
|
};
|
|
|
|
static int process_option(void *data, const char *arg, int key,
|
|
struct fuse_args *outargs)
|
|
{
|
|
switch ((enum OptionKey)key)
|
|
{
|
|
case OPTKEY_HELP:
|
|
print_usage(my_basename(settings.progname));
|
|
exit(0);
|
|
|
|
case OPTKEY_VERSION:
|
|
printf("%s\n", PACKAGE_STRING);
|
|
exit(0);
|
|
|
|
case OPTKEY_CREATE_AS_USER:
|
|
if (getuid() == 0) {
|
|
settings.create_policy = CREATE_AS_USER;
|
|
} else {
|
|
fprintf(stderr, "Error: You need to be root to use --create-as-user !\n");
|
|
return -1;
|
|
}
|
|
return 0;
|
|
case OPTKEY_CREATE_AS_MOUNTER:
|
|
settings.create_policy = CREATE_AS_MOUNTER;
|
|
return 0;
|
|
|
|
case OPTKEY_CHOWN_NORMAL:
|
|
settings.chown_policy = CHOWN_NORMAL;
|
|
return 0;
|
|
case OPTKEY_CHOWN_IGNORE:
|
|
settings.chown_policy = CHOWN_IGNORE;
|
|
return 0;
|
|
case OPTKEY_CHOWN_DENY:
|
|
settings.chown_policy = CHOWN_DENY;
|
|
return 0;
|
|
|
|
case OPTKEY_CHGRP_NORMAL:
|
|
settings.chgrp_policy = CHGRP_NORMAL;
|
|
return 0;
|
|
case OPTKEY_CHGRP_IGNORE:
|
|
settings.chgrp_policy = CHGRP_IGNORE;
|
|
return 0;
|
|
case OPTKEY_CHGRP_DENY:
|
|
settings.chgrp_policy = CHGRP_DENY;
|
|
return 0;
|
|
|
|
case OPTKEY_CHMOD_NORMAL:
|
|
settings.chmod_policy = CHMOD_NORMAL;
|
|
return 0;
|
|
case OPTKEY_CHMOD_IGNORE:
|
|
settings.chmod_policy = CHMOD_IGNORE;
|
|
return 0;
|
|
case OPTKEY_CHMOD_DENY:
|
|
settings.chmod_policy = CHMOD_DENY;
|
|
return 0;
|
|
|
|
case OPTKEY_CHMOD_ALLOW_X:
|
|
settings.chmod_allow_x = 1;
|
|
return 0;
|
|
|
|
case OPTKEY_XATTR_NONE:
|
|
settings.xattr_policy = XATTR_UNIMPLEMENTED;
|
|
return 0;
|
|
case OPTKEY_XATTR_READ_ONLY:
|
|
settings.xattr_policy = XATTR_READ_ONLY;
|
|
return 0;
|
|
case OPTKEY_XATTR_READ_WRITE:
|
|
settings.xattr_policy = XATTR_READ_WRITE;
|
|
return 0;
|
|
|
|
case OPTKEY_CTIME_FROM_MTIME:
|
|
settings.ctime_from_mtime = 1;
|
|
return 0;
|
|
|
|
case OPTKEY_NONOPTION:
|
|
if (!settings.mntsrc) {
|
|
settings.mntsrc = arg;
|
|
return 0;
|
|
} else if (!settings.mntdest) {
|
|
settings.mntdest = arg;
|
|
return 1; /* leave this argument for fuse_main */
|
|
} else {
|
|
fprintf(stderr, "Too many arguments given\n");
|
|
return -1;
|
|
}
|
|
|
|
default:
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
struct fuse_args args = FUSE_ARGS_INIT(argc, argv);
|
|
|
|
/* Fuse's option parser will store things here. */
|
|
static struct OptionData {
|
|
char *user;
|
|
char *group;
|
|
char *perms;
|
|
char *mirror;
|
|
char *mirror_only;
|
|
char *create_for_user;
|
|
char *create_for_group;
|
|
char *create_with_perms;
|
|
int no_allow_other;
|
|
} od = {NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 0};
|
|
|
|
#define OPT2(one, two, key) \
|
|
FUSE_OPT_KEY(one, key), \
|
|
FUSE_OPT_KEY(two, key)
|
|
#define OPT_OFFSET2(one, two, offset, key) \
|
|
{one, offsetof(struct OptionData, offset), key}, \
|
|
{two, offsetof(struct OptionData, offset), key}
|
|
#define OPT_OFFSET3(one, two, three, offset, key) \
|
|
{one, offsetof(struct OptionData, offset), key}, \
|
|
{two, offsetof(struct OptionData, offset), key}, \
|
|
{three, offsetof(struct OptionData, offset), key}
|
|
static const struct fuse_opt options[] = {
|
|
OPT2("-h", "--help", OPTKEY_HELP),
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|
OPT2("-V", "--version", OPTKEY_VERSION),
|
|
OPT_OFFSET2("-u %s", "--user=%s", user, -1),
|
|
OPT_OFFSET2( "--owner=%s", "owner=%s", user, -1),
|
|
OPT_OFFSET3("-g %s", "--group=%s", "group=%s", group, -1),
|
|
OPT_OFFSET3("-p %s", "--perms=%s", "perms=%s", perms, -1),
|
|
OPT_OFFSET3("-m %s", "--mirror=%s", "mirror=%s", mirror, -1),
|
|
OPT_OFFSET3("-M %s", "--mirror-only=%s", "mirror-only=%s", mirror_only, -1),
|
|
OPT_OFFSET3("-n", "--no-allow-other", "no-allow-other", no_allow_other, -1),
|
|
OPT2("--create-as-user", "create-as-user", OPTKEY_CREATE_AS_USER),
|
|
OPT2("--create-as-mounter", "create-as-mounter", OPTKEY_CREATE_AS_MOUNTER),
|
|
OPT_OFFSET2("--create-for-user=%s", "create-for-user=%s", create_for_user, -1),
|
|
OPT_OFFSET2("--create-for-group=%s", "create-for-group=%s", create_for_group, -1),
|
|
OPT_OFFSET2("--create-with-perms=%s", "create-with-perms=%s", create_with_perms, -1),
|
|
OPT2("--chown-normal", "chown-normal", OPTKEY_CHOWN_NORMAL),
|
|
OPT2("--chown-ignore", "chown-ignore", OPTKEY_CHOWN_IGNORE),
|
|
OPT2("--chown-deny", "chown-deny", OPTKEY_CHOWN_DENY),
|
|
OPT2("--chgrp-normal", "chgrp-normal", OPTKEY_CHGRP_NORMAL),
|
|
OPT2("--chgrp-ignore", "chgrp-ignore", OPTKEY_CHGRP_IGNORE),
|
|
OPT2("--chgrp-deny", "chgrp-deny", OPTKEY_CHGRP_DENY),
|
|
OPT2("--chmod-normal", "chmod-normal", OPTKEY_CHMOD_NORMAL),
|
|
OPT2("--chmod-ignore", "chmod-ignore", OPTKEY_CHMOD_IGNORE),
|
|
OPT2("--chmod-deny", "chmod-deny", OPTKEY_CHMOD_DENY),
|
|
OPT2("--chmod-allow-x", "chmod-allow-x", OPTKEY_CHMOD_ALLOW_X),
|
|
OPT2("--xattr-none", "xattr-none", OPTKEY_XATTR_NONE),
|
|
OPT2("--xattr-ro", "xattr-ro", OPTKEY_XATTR_READ_ONLY),
|
|
OPT2("--xattr-rw", "xattr-rw", OPTKEY_XATTR_READ_WRITE),
|
|
OPT2("--ctime-from-mtime", "ctime-from-mtime", OPTKEY_CTIME_FROM_MTIME),
|
|
FUSE_OPT_END
|
|
};
|
|
|
|
/* General-purpose variables */
|
|
int i, j;
|
|
char *p, *tmpstr;
|
|
|
|
int fuse_main_return;
|
|
|
|
|
|
/* Initialize settings */
|
|
settings.progname = argv[0];
|
|
settings.permchain = permchain_create();
|
|
settings.new_uid = -1;
|
|
settings.new_gid = -1;
|
|
settings.create_for_uid = -1;
|
|
settings.create_for_gid = -1;
|
|
settings.mntsrc = NULL;
|
|
settings.mntdest = NULL;
|
|
settings.create_policy = (getuid() == 0) ? CREATE_AS_USER : CREATE_AS_MOUNTER;
|
|
settings.create_permchain = permchain_create();
|
|
settings.chown_policy = CHOWN_NORMAL;
|
|
settings.chgrp_policy = CHGRP_NORMAL;
|
|
settings.chmod_policy = CHMOD_NORMAL;
|
|
settings.chmod_allow_x = 0;
|
|
settings.xattr_policy = XATTR_READ_WRITE;
|
|
settings.mirrored_users_only = 0;
|
|
settings.mirrored_users = NULL;
|
|
settings.num_mirrored_users = 0;
|
|
settings.mirrored_members = NULL;
|
|
settings.num_mirrored_members = 0;
|
|
settings.ctime_from_mtime = 0;
|
|
atexit(&atexit_func);
|
|
|
|
/* Parse options */
|
|
if (fuse_opt_parse(&args, &od, options, &process_option) == -1)
|
|
return 1;
|
|
|
|
/* Check that a source directory and a mount point was given */
|
|
if (!settings.mntsrc || !settings.mntdest) {
|
|
print_usage(my_basename(argv[0]));
|
|
return 1;
|
|
}
|
|
|
|
/* Parse new owner and group */
|
|
if (od.user) {
|
|
if (!user_uid(od.user, &settings.new_uid)) {
|
|
fprintf(stderr, "Not a valid user ID: %s\n", od.user);
|
|
return 1;
|
|
}
|
|
}
|
|
if (od.group) {
|
|
if (!group_gid(od.group, &settings.new_gid)) {
|
|
fprintf(stderr, "Not a valid group ID: %s\n", od.group);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/* Parse user and group for new creates */
|
|
if (od.create_for_user) {
|
|
if (getuid() != 0) {
|
|
fprintf(stderr, "Error: You need to be root to use --create-for-user !\n");
|
|
return 1;
|
|
}
|
|
if (!user_uid(od.create_for_user, &settings.create_for_uid)) {
|
|
fprintf(stderr, "Not a valid user ID: %s\n", od.create_for_user);
|
|
return 1;
|
|
}
|
|
}
|
|
if (od.create_for_group) {
|
|
if (getuid() != 0) {
|
|
fprintf(stderr, "Error: You need to be root to use --create-for-group !\n");
|
|
return 1;
|
|
}
|
|
if (!group_gid(od.create_for_group, &settings.create_for_gid)) {
|
|
fprintf(stderr, "Not a valid group ID: %s\n", od.create_for_group);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/* Parse mirrored users and groups */
|
|
if (od.mirror && od.mirror_only) {
|
|
fprintf(stderr, "Cannot specify both -m|--mirror and -M|--mirror-only\n");
|
|
return 1;
|
|
}
|
|
if (od.mirror_only) {
|
|
settings.mirrored_users_only = 1;
|
|
od.mirror = od.mirror_only;
|
|
}
|
|
if (od.mirror) {
|
|
settings.num_mirrored_users = count_chars(od.mirror, ',') +
|
|
count_chars(od.mirror, ':') + 1;
|
|
settings.num_mirrored_members = ((*od.mirror == '@') ? 1 : 0) +
|
|
count_substrs(od.mirror, ",@") +
|
|
count_substrs(od.mirror, ":@");
|
|
settings.num_mirrored_users -= settings.num_mirrored_members;
|
|
settings.mirrored_users = malloc(settings.num_mirrored_users*sizeof(uid_t));
|
|
settings.mirrored_members = malloc(settings.num_mirrored_members*sizeof(gid_t));
|
|
|
|
i = 0; /* iterate over mirrored_users */
|
|
j = 0; /* iterate over mirrored_members */
|
|
p = od.mirror;
|
|
while (i < settings.num_mirrored_users || j < settings.num_mirrored_members) {
|
|
tmpstr = strdup_until(p, ",:");
|
|
|
|
if (*tmpstr == '@') { /* This is a group name */
|
|
if (!group_gid(tmpstr + 1, &settings.mirrored_members[j++])) {
|
|
fprintf(stderr, "Invalid group ID: '%s'\n", tmpstr + 1);
|
|
free(tmpstr);
|
|
return 1;
|
|
}
|
|
} else {
|
|
if (!user_uid(tmpstr, &settings.mirrored_users[i++])) {
|
|
fprintf(stderr, "Invalid user ID: '%s'\n", tmpstr);
|
|
free(tmpstr);
|
|
return 1;
|
|
}
|
|
}
|
|
free(tmpstr);
|
|
|
|
while (*p != '\0' && *p != ',' && *p != ':')
|
|
++p;
|
|
if (*p != '\0')
|
|
++p;
|
|
else {
|
|
/* Done. The counters should match. */
|
|
assert(i == settings.num_mirrored_users);
|
|
assert(j == settings.num_mirrored_members);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Parse permission bits */
|
|
if (od.perms) {
|
|
if (add_chmod_rules_to_permchain(od.perms, settings.permchain) != 0) {
|
|
fprintf(stderr, "Invalid permission specification: '%s'\n", od.perms);
|
|
return 1;
|
|
}
|
|
}
|
|
if (od.create_with_perms) {
|
|
if (add_chmod_rules_to_permchain(od.create_with_perms, settings.create_permchain) != 0) {
|
|
fprintf(stderr, "Invalid permission specification: '%s'\n", od.create_with_perms);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
|
|
/* Add default fuse options */
|
|
if (!od.no_allow_other) {
|
|
fuse_opt_add_arg(&args, "-oallow_other");
|
|
}
|
|
|
|
/* We want the kernel to do our access checks for us based on what getattr gives it. */
|
|
fuse_opt_add_arg(&args, "-odefault_permissions");
|
|
|
|
/* We need to disable the attribute cache whenever two users
|
|
can see different attributes. For now, only mirroring can do that. */
|
|
if (is_mirroring_enabled()) {
|
|
fuse_opt_add_arg(&args, "-oattr_timeout=0");
|
|
}
|
|
|
|
/* If the mount source and destination directories are the same
|
|
then don't require that the directory be empty. */
|
|
if (strcmp(settings.mntsrc, settings.mntdest) == 0)
|
|
fuse_opt_add_arg(&args, "-ononempty");
|
|
|
|
/* Open mount source for chrooting in bindfs_init */
|
|
settings.mntsrc_fd = open(settings.mntsrc, O_RDONLY);
|
|
if (settings.mntsrc_fd == -1) {
|
|
fprintf(stderr, "Could not open source directory\n");
|
|
return 1;
|
|
}
|
|
|
|
/* Ignore the umask of the mounter on file creation */
|
|
umask(0);
|
|
|
|
/* Remove xattr implementation if the user doesn't want it */
|
|
if (settings.xattr_policy == XATTR_UNIMPLEMENTED) {
|
|
bindfs_oper.setxattr = NULL;
|
|
bindfs_oper.getxattr = NULL;
|
|
bindfs_oper.listxattr = NULL;
|
|
bindfs_oper.removexattr = NULL;
|
|
}
|
|
|
|
fuse_main_return = fuse_main(args.argc, args.argv, &bindfs_oper);
|
|
|
|
fuse_opt_free_args(&args);
|
|
close(settings.mntsrc_fd);
|
|
|
|
return fuse_main_return;
|
|
}
|