libgocryptfs/Documentation/MANPAGE.md

% GOCRYPTFS(1) % github.com/rfjakob % May 2016

NAME

gocryptfs - mount an encrypted directory

SYNOPSIS

Initialize encrypted filesystem

gocryptfs -init [OPTIONS] CIPHERDIR

Mount

gocryptfs [OPTIONS] CIPHERDIR MOUNTPOINT

Change password

gocryptfs -passwd [OPTIONS] CIPHERDIR

DESCRIPTION

Options:

-allow_other

By default, the Linux kernel prevents any other user (even root) to access a mounted FUSE filesystem. Settings this option allows access for other users, subject to file permission checking. Only works if user_allow_other is set in /etc/fuse.conf. This option is equivalent to "allow_other" plus "default_permissions" described in fuse(8).

-config string

Use specified config file instead of CIPHERDIR/gocryptfs.conf

-cpuprofile string

Write cpu profile to specified file

-d, -debug

Enable debug output

-diriv

Use per-directory file name IV (default true) This flag is useful when recovering old gocryptfs filesystems using "-masterkey". It is ignored (stays at the default) otherwise.

-emenames

Use EME filename encryption (default true), implies diriv. This flag is useful when recovering old gocryptfs filesystems using "-masterkey". It is ignored (stays at the default) otherwise.

-extpass string

Use an external program (like ssh-askpass) for the password prompt. The program should return the password on stdout, a trailing newline is stripped by gocryptfs. Using something like "cat /mypassword.txt" allows to mount the gocryptfs filesytem without user interaction.

-f

Stay in the foreground instead of forking away.

-fusedebug

Enable fuse library debug output

-gcmiv128

Use an 128-bit IV for GCM encryption instead of Go's default of 96 bits (default true). This pushes back the birthday bound for IV collisions far enough to make it irrelevant. This flag is useful when recovering old gocryptfs filesystems using "-masterkey". It is ignored (stays at the default) otherwise.

-init

Initialize encrypted directory

-longnames

Store names longer than 176 bytes in extra files (default true) This flag is useful when recovering old gocryptfs filesystems using "-masterkey". It is ignored (stays at the default) otherwise.

-masterkey string

Mount with explicit master key specified on the command line. This option can be used to mount a gocryptfs filesystem without a config file. Note that the command line, and with it the master key, is visible to anybody on the machine who can execute "ps -auxwww".

-memprofile string

Write memory profile to specified file. This is useful when debugging memory usage of gocryptfs.

-nosyslog

Diagnostic messages are normally redirected to syslog once gocryptfs daemonizes. This option disables the redirection and messages will continue be printed to stdout and stderr.

-notifypid int

Send USR1 to the specified process after successful mount. This is used internally for daemonization.

-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 you are using Go 1.6+. In mode "auto", gocrypts chooses the faster option.

-passwd

Change password

-plaintextnames

Do not encrypt file names

-q, -quiet

Quiet - silence informational messages

-scryptn int

scrypt cost parameter logN. Setting this to a lower value speeds up mounting but makes the password susceptible to brute-force attacks (default 16)

-version

Print version and exit

-wpanic

When encountering a warning, panic and exit immediately. This is useful in regression testing.

-zerokey

Use all-zero dummy master key. This options is only intended for automated testing as it does not provide any security.

EXAMPLES

Create and mount an encrypted filesystem:

mkdir /tmp/g1 /tmp/g2

gocryptfs -init /tmp/g1
gocryptfs /tmp/g1 /tmp/g2

SEE ALSO

fuse(8)