My opinion is to create a single user(which is not in the root list!!!!) and use this user to copy the backup files. You can make an arhive with your files and send only that archive. You will have to create the public/private key for this user and to copy first the backups in his home directory. Then with local script (that can have root privileges) you can move that file wherever you want. Can use also multiple files. (I use SCP command for copy) I see this way more secure. Don't have to access with public root keys and if a machine becomes compromized on the other only THAT single user is accessible. Give to that user no other rights, just for that backup copy. I would like to see also other ideeas. Bers regards. Andy. PS: i'm not that good at linux... but learning... ----- Original Message ----- From: "Mario Ohnewald" To: Sent: Thursday, December 04, 2003 11:31 AM Subject: [suse-security] Secure Backup

Hello! I have two boxes and want to save a backup of each others on it. So far i have created a ssh key for both machines so i can make a ssh rsync to each other. But the terrible sideeffect is that IF one of those boxed get compromized the cracker will be root on both of them!!!

My Backup script: #--- START --------------------------------------------------------------------- #!/bin/sh speed=500 verzeichnisse="etc home root boot usr/local/bin/"

for verzeichniss in $verzeichnisse do find /$verzeichniss -size +10200k | rsync -avvz --exclude-from=- --delete -e "ssh" /$verzeichniss bortal.de:/backup/sts/ done #--- END -------------------------------------------------------------------------

I need to save it on each other because both have a 100MBit Internet connection which makes a restoring backup easy! So a tape Backup is not really possible. :/

Any ideas/hints?

Cheers, Mario

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Hi, so, why do you want to save the backup on the other Side with root-rights ? Do you _really_ need this for User Data? Check this out first. Maybe it is better Using some Kind of tar to save Data on the other Side. You could use some Kind of chroot, or userspace Linux as well. SuDO might help you too. I recomend the way, logging in unprivileged on the other Side, and save the Backup in a gzipped tar-File. Greetings Dirk Mario Ohnewald schrieb:

Hello! I have two boxes and want to save a backup of each others on it. So far i have created a ssh key for both machines so i can make a ssh rsync to each other. But the terrible sideeffect is that IF one of those boxed get compromized the cracker will be root on both of them!!!

My Backup script: #--- START --------------------------------------------------------------------- #!/bin/sh speed=500 verzeichnisse="etc home root boot usr/local/bin/"

for verzeichniss in $verzeichnisse do find /$verzeichniss -size +10200k | rsync -avvz --exclude-from=- --delete -e "ssh" /$verzeichniss bortal.de:/backup/sts/ done #--- END -------------------------------------------------------------------------

I need to save it on each other because both have a 100MBit Internet connection which makes a restoring backup easy! So a tape Backup is not really possible. :/

Any ideas/hints?

Cheers, Mario