2.2 KiB
Mounting gocryptfs on login using pam_mount
This works on Fedora 24 with active SELinux. Feedback on other platforms is welcome.
gocryptfs
Copy the gocryptfs binary and gocryptfs_pam_mount.bash into
/usr/local/bin .
The bash wrapper is neccessary because of the different calling conventions between pam_mount and gocryptfs.
Create a gocryptfs filesystem:
$ mkdir /home/testuser/cipher /home/testuser/plain
$ gocryptfs -init /home/testuser/cipher
pam_mount config
Put the following into /etc/security/pam_mount.conf.xml, just before
the closing </pam_mount> tag at the bottom:
<volume user="testuser" fstype="fuse" options="defaults"
path="/usr/local/bin/gocryptfs_pam_mount.bash#/home/%(USER)/cipher"
mountpoint="/home/%(USER)/plain" />
Replace testuser with your user name.
If you want to disable the display of the masterkey on mount, replace
options="defaults" with options="quiet".
PAM config
An example /etc/pam.d/login on Fedora 24 is shown below. pam_mount
MUST be called AFTER pam_selinux.so open because that puts us in the
right SELinux context. If are logging in via gcm, also add the line in
/etc/pam.d/gdm-password.
#%PAM-1.0
auth substack system-auth
auth include postlogin
account required pam_nologin.so
account include system-auth
password include system-auth
session required pam_selinux.so close
session required pam_loginuid.so
session optional pam_console.so
session required pam_selinux.so open
session required pam_namespace.so
# vvv insert pam_mount here
session optional pam_mount.so
# ^^^ insert pam_mount here
session optional pam_keyinit.so force revoke
session include system-auth
session include postlogin
-session optional pam_ck_connector.so
Encrypting the whole home directory
Use this volume definition in /etc/security/pam_mount.conf.xml:
<volume user="testuser-whole-home" fstype="fuse" options="nonempty,allow_other"
path="/usr/local/bin/gocryptfs_pam_mount.bash#/home/%(USER).cipher"
mountpoint="/home/%(USER)" />
Replace testuser-whole-home with your user name.