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From: Nicolas Iooss <>
To: refpolicy <>
Subject: Intent to add support for cryfs
Date: Sun, 10 Nov 2019 19:32:43 +0100
Message-ID: <> (raw)

I am using CryFS ( in order to encrypt some
files in a shared directory. Before writing a policy for this software
and upstreaming it to refpolicy, I am wondering how this should be

CryFS is a software that can be run by non-root users that have access
to /dev/fuse. Its command is directly used to mount a directory
("/usr/bin/cryfs basedir mountpoint"), like command "mount".
Unmounting a mountpoint is done with "fusermount -u mountpoint",
/usr/bin/fusermount being a setuid-root program labeled mount_exec_t.
Currently, sysadm_t cannot use CryFS because it is not allowed to open
and use /dev/fuse (ie. fuse_device_t). Moreover labeling CryFS as
mount_exec_t makes mount_t require more accesses (reading a
configuration file from the base directory, reading
/proc/sys/crypto/fips_enabled, using pipes, etc.).

Therefore I am thinking of creating a new policy module for cryfs,
which could be shared with other similar software like EncFS
( Does this sound like something
acceptable? Did I miss an existing module that can be extended in
order to support CryFS?


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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-10 18:32 Nicolas Iooss [this message]
2019-11-12 10:28 ` Dominick Grift

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