From 15b88756add78a065fd81120d9447ca1de80dbfe Mon Sep 17 00:00:00 2001 From: Jakob Unterwurzacher Date: Sun, 26 Jun 2016 23:03:18 +0200 Subject: [PATCH] main: add "-o" option to enable "suid" and "dev" Device files and suid binaries are often not needed when running gocryptfs as root. As they are potentially dangerous, let the user enable them explicitely via the new "-o" option instead of always enabling them when running as root. --- Documentation/MANPAGE.md | 9 +++++++++ main.go | 18 +++++++++--------- 2 files changed, 18 insertions(+), 9 deletions(-) diff --git a/Documentation/MANPAGE.md b/Documentation/MANPAGE.md index 11d903d..66e8606 100644 --- a/Documentation/MANPAGE.md +++ b/Documentation/MANPAGE.md @@ -85,6 +85,15 @@ continue be printed to stdout and stderr. : Send USR1 to the specified process after successful mount. This is used internally for daemonization. +**-o** +: Pass additonal mount options to the kernel (comma-separated list). +FUSE filesystems are mounted with "nodev,nosuid" by default. If gocryptfs +runs as root, you can enable device files by passing the opposite mount option, +"dev", and if you want to enable suid-binaries, pass "suid". +"ro" (equivalent to passing the "-ro" option) and "noexec" may also be +interesting. For a complete liste see the section +`FILESYSTEM-INDEPENDENT MOUNT OPTIONS` in mount(8). + **-openssl bool** : Use OpenSSL instead of built-in Go crypto (default "auto"). Using built-in crypto is 4x slower unless your CPU has AES instructions and diff --git a/main.go b/main.go index 68dfb0a..b5de959 100644 --- a/main.go +++ b/main.go @@ -45,7 +45,7 @@ type argContainer struct { plaintextnames, quiet, nosyslog, wpanic, longnames, allow_other, ro bool masterkey, mountpoint, cipherdir, cpuprofile, config, extpass, - memprofile string + memprofile, o string notifypid, scryptn int } @@ -185,6 +185,7 @@ func main() { flagSet.StringVar(&args.memprofile, "memprofile", "", "Write memory profile to specified file") flagSet.StringVar(&args.config, "config", "", "Use specified config file instead of CIPHERDIR/gocryptfs.conf") flagSet.StringVar(&args.extpass, "extpass", "", "Use external program for the password prompt") + flagSet.StringVar(&args.o, "o", "", "Pass additional mount options to the kernel, comma-separated list") flagSet.IntVar(&args.notifypid, "notifypid", 0, "Send USR1 to the specified process after "+ "successful mount - used internally for daemonization") flagSet.IntVar(&args.scryptn, "scryptn", configfile.ScryptDefaultLogN, "scrypt cost parameter logN. "+ @@ -402,13 +403,6 @@ func initFuseFrontend(key []byte, args argContainer, confFile *configfile.ConfFi // Make the kernel check the file permissions for us mOpts.Options = append(mOpts.Options, "default_permissions") } - if os.Getuid() == 0 { - // FUSE filesystems are mounted with "nodev" by default. If we run as root, - // we can use device files by passing the opposite mount option, "dev". - mOpts.Options = append(mOpts.Options, "dev") - // Same thing for "nosuid". If we run as root, we can pass "suid". - mOpts.Options = append(mOpts.Options, "suid") - } // Set values shown in "df -T" and friends // First column, "Filesystem" mOpts.Options = append(mOpts.Options, "fsname="+args.cipherdir) @@ -419,7 +413,13 @@ func initFuseFrontend(key []byte, args argContainer, confFile *configfile.ConfFi if args.ro { mOpts.Options = append(mOpts.Options, "ro") } - + // Add additional mount options (if any) after the stock ones, so the user has + // a chance to override them. + if args.o != "" { + parts := strings.Split(args.o, ",") + tlog.Debug.Printf("Adding -o mount options: %v", parts) + mOpts.Options = append(mOpts.Options, parts...) + } srv, err := fuse.NewServer(conn.RawFS(), args.mountpoint, &mOpts) if err != nil { tlog.Fatal.Printf("Mount failed: %v", err)