98 lines
3.3 KiB
Plaintext
98 lines
3.3 KiB
Plaintext
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#!/bin/bash
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#
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# Set up encrypted directory ~/.enc
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#
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# Copyright (C) 2013 Mike Gerwitz
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# This encrypted directory strikes a balance between a full encrypted home
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# directory (a feature provided by many modern GNU/Linux distributions) and
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# privacy: Specifically, most files are configuration and do not really need
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# to be private (indeed, many of them are even in my public repository).
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#
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# This expects that the ~/.enc{,-data} directories have already been created
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# when the system was set up. Any data in either of the directories will be
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# copied into the final, encrypted directory, with the ~/.enc-data contents
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# taking precedence in the event of a filename conflict.
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##
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encdatadir="$HOME/.enc-data"
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encdatadirtmp="$HOME/.enc-data.tmp"
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encdir="$HOME/.enc"
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readyfile=".ready"
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# graceful exit if we've already been set up
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[ -e "$encdatadir/$readyfile" ] && {
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echo "$encdir is already set up."
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exit
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}
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# do not allow this action to be performed over SSH or while sshd is running
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# and tell the user to ensure that all running processes are trusted (no
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# keyloggers, etc)
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[ "$1" != --shutit ] && pgrep '^sshd?$' &>/dev/null && {
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echo "fatal: please disable SSH and close all connections" >&2
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echo "fatal: and then verify all running processes" >&2
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echo "fatal: (or pass --shutit if you're confident)" >&2
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exit 1
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}
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# allows glob to match dotfiles
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shopt -s dotglob || {
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echo "fatal: failed to enable dotglob" >&2
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exit 1
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}
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# move the existing dir so that we can copy the files back in after (just in
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# case files were created in anticipation); also copy over existing .enc dir
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# contents, having .enc-data contents take precedence
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[ -e "$encdatadir" ] && {
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mv -v "$encdatadir" "$encdatadirtmp" \
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&& cp -rnv "$encdir"/* "$encdatadirtmp/" \
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&& mkdir -v "$encdatadir" \
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|| exit $?
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}
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# proceed (the nonempty options ignores the fact that ~/.enc---out mount
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# point---is likely not empty)
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echo "creating $encdatadir -> $encdir..."
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encfs "$encdatadir" "$encdir" -ononempty \
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|| {
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err=$?
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echo "fatal: failed!" >&2
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exit $err
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}
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# this file will be copied into the encrypted dir and is an easy mount check
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# for scripts
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touch "$encdatadirtmp/.available"
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# mark as complete (yes, we intend to put this directly into the encrypted
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# data dir)
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date +%s > "$encdatadir/$readyfile"
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# copy previous data into the newly mounted and decrypted directory
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mv -v "$encdatadirtmp"/* "$encdir/" \
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&& find "$encdatadirtmp" -type f -exec shred -fuvz {} \; \
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&& rm -rfv "$encdatadirtmp" \
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|| {
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err=$?
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echo "fatal: $encdatadir created, but data copy failed" >&2
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echo "fatal: please copy $encdatadirtmp/* manually" >&2
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echo "fatal: and then shred its contents" >&2
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}
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echo Setup complete.
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