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osync/ssh_filter.sh

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#!/bin/bash
##### Obackup & Osync ssh command filter build 2408201301
##### This script should be located in /usr/local/bin in the remote system to sync / backup
##### It will filter the commands that can be run remotely via ssh.
##### Please chmod 755 and chown root:root this file
##### Obackup needed commands: rsync find du mysql mysqldump (sudo)
##### Osync needed commands: rsync find du echo mkdir rm if df (sudo)
## If enabled, execution of "sudo" command will be allowed.
SUDO_EXEC=yes
## Paranoia option. Don't change this unless you read the documentation and still feel concerned about security issues.
RSYNC_EXECUTABLE=rsync
## Enable other commands, useful for remote execution hooks like remotely creating snapshots.
CMD1=
CMD2=
CMD3=
LOG_FILE=~/.ssh/ssh_filter.log
function Log
{
DATE=$(date)
echo "$DATE - $1" >> $LOG_FILE
}
function Go
{
eval $SSH_ORIGINAL_COMMAND
}
case ${SSH_ORIGINAL_COMMAND%% *} in
"$RSYNC_EXECUTABLE")
Go ;;
"mysqldump")
Go ;;
"mysql")
Go ;;
"echo")
Go ;;
"find")
Go ;;
"du")
Go ;;
"mkdir")
Go ;;
"rm")
Go ;;
"df")
Go ;;
"$CMD1")
Go ;;
"$CMD2")
Go ;;
"$CMD3")
Go ;;
"sudo")
if [ "$SUDO_EXEC" == "yes" ]
then
if [[ "$SSH_ORIGINAL_COMMAND" == "sudo $RSYNC_EXECUTABLE"* ]]
then
Go
elif [[ "$SSH_ORIGINAL_COMMAND" == "sudo du"* ]]
then
Go
elif [[ "$SSH_ORIGINAL_COMMAND" == "sudo find"* ]]
then
Go
elif [[ "$SSH_ORIGINAL_COMMAND" == "sudo mkdir"* ]]
then
Go
elif [[ "$SSH_ORIGINAL_COMMAND" == "sudo rm"* ]]
then
Go
elif [[ "$SSH_ORIGINAL_COMMAND" == "sudo echo"* ]]
then
Go
elif [[ "$SSH_ORIGINAL_COMMAND" == "sudo df"* ]]
then
Go
elif [[ "$SSH_ORIGINAL_COMMAND" == "sudo $CMD1"* ]]
then
Go
elif [[ "$SSH_ORIGINAL_COMMAND" == "sudo $CMD2"* ]]
then
Go
elif [[ "$SSH_ORIGINAL_COMMAND" == "sudo $CMD3"* ]]
then
Go
else
Log "Command [$SSH_ORIGINAL_COMMAND] not allowed."
exit 1
fi
else
Log "Command [$SSH_ORIGINAL_COMMAND] not allowed. sudo not enabled."
exit 1
fi
;;
*)
Log "Command [$SSH_ORIGINAL_COMMAND] not allowed."
exit 1
esac