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Comment:Allow administrators to provide additional/replaced permissions for files, fixed suidRoot setting
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SHA1: e9fcc6d8f52f28a19bad96be870994ef91b05e5a
User & Date: rkeene on 2015-03-19 16:09:20
Other Links: manifest | tags
Context
2015-03-20
01:46
Updated to lowercase permissions read from the database, for security check-in: 0ab26b4975 user: rkeene tags: trunk
2015-03-19
16:09
Allow administrators to provide additional/replaced permissions for files, fixed suidRoot setting check-in: e9fcc6d8f5 user: rkeene tags: trunk
15:43
Updated to indicate local files are not world-accessible (good idea ?) check-in: 9be4aa6a4a user: rkeene tags: trunk
Changes
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Modified appfsd.c from [3e9adabf49] to [fe7e6328bd].

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	unsigned long long inode;
	union {
		struct {
			int childcount;
		} dir;
		struct {
			int executable;
			int suid;
			int suidRoot;
			int worldaccessible;
			off_t size;
		} file;
		struct {
			off_t size;
			char source[256];
		} symlink;
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				}

				break;
			case 'f': /* file */
				pathinfo->type = APPFS_PATHTYPE_FILE;
				pathinfo->typeinfo.file.size = 0;
				pathinfo->typeinfo.file.executable = 0;
				pathinfo->typeinfo.file.suid = 0;
				pathinfo->typeinfo.file.suidRoot = 0;
				pathinfo->typeinfo.file.worldaccessible = 0;

				Tcl_DictObjGet(interp, attrs_dict, attr_key_size, &attr_value);
				if (attr_value != NULL) {
					tcl_ret = Tcl_GetWideIntFromObj(NULL, attr_value, &attr_value_wide);
					if (tcl_ret == TCL_OK) {
						pathinfo->typeinfo.file.size = attr_value_wide;
					}
				}

				Tcl_DictObjGet(interp, attrs_dict, attr_key_perms, &attr_value);
				if (attr_value != NULL) {
					attr_value_str = Tcl_GetString(attr_value);
					for (attr_value_str_i = &attr_value_str[0]; *attr_value_str_i != '\0'; attr_value_str_i++) {
						switch (*attr_value_str_i) {
							case 'x':
								pathinfo->typeinfo.file.executable = 1;

								break;
							case 'U':
								pathinfo->typeinfo.file.suid = 1;
								pathinfo->typeinfo.file.suidRoot = 1;

								break;
							case '-':
								pathinfo->typeinfo.file.worldaccessible = 1;

								break;
						}
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	memcpy(buf, pathinfo.typeinfo.symlink.source, strlen(pathinfo.typeinfo.symlink.source) + 1);

	return(0);
}

static int appfs_fuse_getattr(const char *path, struct stat *stbuf) {
	struct appfs_pathinfo pathinfo;
	int changeOwnerToUserIfPackaged;
	int retval;

	retval = 0;

	APPFS_DEBUG("Enter (path = %s, ...)", path);

#if (defined(DEBUG) && defined(APPFS_EXIT_PATH)) || defined(APPFS_EXIT_PATH_ENABLE_MAJOR_SECURITY_HOLE)
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	stbuf->st_mtime = pathinfo.time;
	stbuf->st_ctime = pathinfo.time;
	stbuf->st_atime = pathinfo.time;
	stbuf->st_ino   = pathinfo.inode;
	stbuf->st_mode  = 0;

	changeOwnerToUserIfPackaged = 1;

	switch (pathinfo.type) {
		case APPFS_PATHTYPE_DIRECTORY:
			stbuf->st_mode = S_IFDIR | 0555;
			stbuf->st_nlink = 2 + pathinfo.typeinfo.dir.childcount;
			break;
		case APPFS_PATHTYPE_FILE:
			if (pathinfo.typeinfo.file.executable) {
				stbuf->st_mode = S_IFREG | 0555;
			} else {
				stbuf->st_mode = S_IFREG | 0444;
			stbuf->st_mode = S_IFREG | 0444;

			if (pathinfo.typeinfo.file.executable) {
				stbuf->st_mode |= 0111;
			}

			if (pathinfo.typeinfo.file.suid) {
				stbuf->st_mode = S_IFREG | 04000;
			if (pathinfo.typeinfo.file.suidRoot) {
				changeOwnerToUserIfPackaged = 0;

				stbuf->st_mode |= 04000;
			}

			if (pathinfo.typeinfo.file.worldaccessible) {
				stbuf->st_mode &= ~077;
			}

			stbuf->st_nlink = 1;
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			break;
		case APPFS_PATHTYPE_INVALID:
			retval = -EIO;

			break;
	}

	if (pathinfo.packaged) {
	if (pathinfo.packaged && changeOwnerToUserIfPackaged) {
		stbuf->st_uid   = appfs_get_fsuid();
		stbuf->st_gid   = appfs_get_fsgid();
		stbuf->st_mode |= 0200;
	}

	return(retval);
}
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	 ** Add FUSE arguments which we always supply
	 **/
	fuse_opt_add_arg(args, "-odefault_permissions,fsname=appfs,subtype=appfsd,use_ino,kernel_cache,entry_timeout=0,attr_timeout=0,big_writes,intr,hard_remove");

	if (getuid() == 0) {
		fuse_opt_parse(args, NULL, NULL, NULL);
		fuse_opt_add_arg(args, "-oallow_other");

		/*
		 * This should generally be avoided, but if there are security
		 * concerns suid can be disabled completely on the commandline
		 */
		fuse_opt_parse(args, NULL, NULL, NULL);
		fuse_opt_add_arg(args, "-osuid");
	}

	while ((ch = getopt(argc, argv, "dfshvo:")) != -1) {
		switch (ch) {
			case 'v':
				/* Ignored */
				break;
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Modified appfsd.tcl from [c5b01df3b2] to [ca14ca67ab].

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		return "http://$hostname/appfs/$method/$hash"
	}

	# User-replaceable function get the home directory of the current user
	proc get_homedir {} {
		return [::appfsd::get_homedir]
	}

	# User-replacable function to update permissions
	proc change_perms {file perms} {
		if {[info exists ::appfs::user::add_perms($file)]} {
			append perms $::appfs::user::add_perms($file)
		}

		return $perms
	}
}

namespace eval ::appfs {
	variable cachedir "/tmp/appfs-cache"
	variable ttl 3600
	variable nttl 60
	variable trusted_cas [list]
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							"directory" {
								set retval(type) "directory"
								set retval(childcount) [llength [getchildren $path]]
							}
							"file" {
								set retval(type) "file"
								set retval(size) $localpathinfo(size)

								# Once the user writes to a file, all its other
								# attributes (such as suid) are lost

								_as_user {
									if {[file executable $localpath]} {
										set retval(perms) "x-"
									} else {
										set retval(perms) "-"
									}
								}
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						set file [lindex $work end]

						if {$directory == "" && $file == ""} {
							array set retval [list type directory]
						}

						::appfs::db eval {SELECT type, time, source, size, perms FROM files WHERE package_sha1 = $pathinfo(package_sha1) AND file_directory = $directory AND file_name = $file;} retval {}

						# Allow an administrator to supply additional permissions to remote files
						if {[info exists retval(perms)]} {
							set retval(perms) [::appfs::user::change_perms $path $retval(perms)]
						}

						if {[info exists retval(type)] && $retval(type) == "directory"} {
							set retval(childcount) [llength [getchildren $path]]
						}

						unset -nocomplain retval(*)
					}
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