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#!/usr/bin/env bash
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#set -x
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# Script: ocdec.sh
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# Author: Andrey Arapov
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# Email: andrey.arapov@nixaid.com
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#
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# Copyright (C) 2015 Andrey Arapov
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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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#
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#
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# Version: 1.0.0 - Initial release (22 September 2015)
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#
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# Tested with:
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# - ownCloud 8.1.3
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#
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# Limitations:
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# - with some files (binary ones) it is running really slow
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#
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#
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# === Usage notes
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#
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# Current directory should be the ownCloud data directory !
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# You can find it this way:
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# grep -i datadirectory /srv/pathto/owncloud/config/config.php
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# 'datadirectory' => '/srv/ownclouddata/',
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#
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# Make sure you have exported env. variable, e.g.
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# export userLoginPass='s3cr3tpass'
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#
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#
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# === Usage Example - Decrypt just 1 file
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#
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# export userLoginPass='s3cr3tpass'
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# cd /srv/ownclouddata
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# /tmp/ocdec.sh testuser1/files/secretfile.txt
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#
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#
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# === Usage Example 2 - Decrypt Everything!
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#
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# 1. Create directory structure for decrypted data
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#
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# export USER=testuser1
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# export userLoginPass='s3cr3tpass'
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# cd /srv/ownclouddata
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# find ${USER}/files -type d |cut -sd / -f 2- |xargs -I@ mkdir -p "${USER}-DECRYPTED/@"
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#
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#
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# 2. Decrypt the data
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#
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# cd /srv/ownclouddata
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# find ${USER}/files -type f |xargs -I@ sh -c '/tmp/ocdec.sh "@" > "${USER}-DECRYPTED/$(echo @|cut -sd / -f 2-)"'
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#
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# Now all your data is decrypted & available at the ${USER}-DECRYPTED/ path !
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#
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#
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# Beginning of a script
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#
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# Get User Private Key
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#
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# arg1: username
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# arg2: password
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function decryptUserPrivateKey() {
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USER=$1
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userLoginPass=$2
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userPrivKeyPath="$USER/files_encryption/OC_DEFAULT_MODULE/$USER.privateKey"
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if [ ! -r "$userPrivKeyPath" ]; then
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echo "decryptUserPrivateKey():: File "$userPrivKeyPath" does not exist or not enough permissions! Aborting."
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return 1
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fi
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encPrivKeyContentsALL="$(cat "$userPrivKeyPath")"
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# Some non-GNU versions of sed do not support pattern matches. In that case use: perl -pne 's/(00iv00.*)?00iv00.*/$1 /'
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encPrivKeyContentsBASE64="$( sed -r 's/^HBEGIN:.+:HEND-*//;s/(00iv00.*)?00iv00.*{16}xx/\1/' <(echo "${encPrivKeyContentsALL}") )"
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plainPrivKeyIV="$( sed -r 's/^HBEGIN.*00iv00//;s/xx$//' <(echo "${encPrivKeyContentsALL}") )"
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userLoginPassHEX=$(echo -n $userLoginPass |od -An -tx1 |tr -dc '[:xdigit:]')
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plainPrivKeyIVHEX=$(echo -n $plainPrivKeyIV |od -An -tx1 |tr -dc '[:xdigit:]')
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echo "$( openssl enc -AES-256-CFB -d -nosalt -base64 -A -K $userLoginPassHEX -iv $plainPrivKeyIVHEX -in <(echo $encPrivKeyContentsBASE64) )"
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}
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#
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# Decrypt the file
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#
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# arg1: username
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# arg2: path to an encrypted file (e.g. 'files/secretfile.txt' or 'files/Photos/Squirrel.jpg')
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# arg3: user Private Key in plaintext
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function decryptFile() {
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USER="$1"
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encFilePath="$2"
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plainUserPrivKey="$3"
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if [ ! -r "${USER}/$encFilePath" ]; then
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echo "decryptFile():: File "${USER}/$encFilePath" does not exist or not enough permissions! Aborting."
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return 1
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fi
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if ! grep -q "^HBEGIN:" "${USER}/$encFilePath"; then
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echo "decryptFile():: File "${USER}/$encFilePath" does not seem to be encrypted! Aborting."
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return 1
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fi
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# --- Get the FileKey ---
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userFileShareKeyPath="${USER}/files_encryption/keys/${encFilePath}/OC_DEFAULT_MODULE/${USER}.shareKey"
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encFileKeyPath="${USER}/files_encryption/keys/${encFilePath}/OC_DEFAULT_MODULE/fileKey"
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decUserFileShareKeyHEX="$( openssl rsautl -decrypt -inkey <(echo "$plainUserPrivKey") -in "$userFileShareKeyPath" |od -An -tx1 |tr -dc '[:xdigit:]' )"
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if [ -z "$decUserFileShareKeyHEX" ];then echo "decryptFile():: The User Private Key is not good. Are you sure your ownCloud User Login password is correct?"; return 1; fi
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decFileKeyContent="$( openssl rc4 -d -in "$encFileKeyPath" -iv 0 -K $decUserFileShareKeyHEX )"
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decFileKeyContentHEX="$( echo -n $decFileKeyContent |od -An -tx1 |tr -dc '[:xdigit:]' )"
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# --- Get the FileKey ---
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# --- Decrypt the file ---
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# TODO: to figure out how to speed-up the decryption process
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encFileContentsALL="$(cat "${USER}/$encFilePath")"
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encFileContentsNOHEAD=$(echo -n "$encFileContentsALL" | sed -r 's/^HBEGIN:.+:HEND-*//')
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N=0
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for IV in $(echo -n "$encFileContentsNOHEAD" |grep -E -o '00iv00.{16}xx' |sed -r 's/^00iv00//;s/xx$//'); do
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N=$[N+1]
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encFileContentsBASE64=$(echo -n "$encFileContentsNOHEAD" |awk -F '00iv00................xx' -v N=$N '{print $N}')
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plainFileIVHEX=$(echo -n "$IV" |od -An -tx1 |tr -dc '[:xdigit:]')
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openssl enc -AES-256-CFB -d -nosalt -base64 -A -K $decFileKeyContentHEX -iv $plainFileIVHEX -in <(echo "$encFileContentsBASE64")
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#php -r "echo openssl_decrypt('$encFileContentsBASE64', 'AES-256-CFB', '$decFileKeyContent', false, '$IV');"
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done
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# --- Decrypt the file ---
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}
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# Get a username from the path (arg1)
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USER="$(echo $1 |cut -sd / -f 1)"
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# Strip off the username from the path (arg1)
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FILETD="$(echo $1 |cut -sd / -f 2-)"
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if [ ! -r "$USER" ]; then
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echo "User directory cannot be found! Are you sure you are in ownCloud's data directory?"
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exit 1
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fi
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if [ -z "$userLoginPass" ]; then
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echo "Please set userLoginPass environment variable!"
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exit 1
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fi
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if [ ! -r "$1" ]; then
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echo "File specified $1 does not exist or not enough permissions to access it!"
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exit 1
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fi
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#
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# TODO: Add checks for available tools installed: openssl, sed, cat, od, tr, mawk
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#
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#
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# 1) Locate and decrypt User Private Key
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#
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# TODO: to decrypt User Private Key only once when running this script in a loop (decrypting multiple files)
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plainUserPrivKey="$(decryptUserPrivateKey $USER $userLoginPass)";
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#
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# 2) Decrypt the shareKey, then the fileKey, then the file and output the plaintext
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#
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decryptFile $USER "$FILETD" "$plainUserPrivKey"
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# End of a script
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