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On 11/13/11 13:03, Grant wrote: |
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>>>> And if I pull, none of my backed-up systems are secure because anyone |
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>>>> who breaks into the backup server has root read privileges on every |
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>>>> backed-up system and will thereby "gain full root privileges quickly." |
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>>> |
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>>> IMO that depends on whether you also backup the authentication-related |
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>>> files or not. Exclude them from backup, ensure different root passwords |
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>>> for all boxes, and now you can limit the infiltration. |
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>> |
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>> If you're pulling to the backup server, that backup server has to be |
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>> able to log in to and read all files on the other servers. Including |
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>> e.g. your swap partition and device files. |
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> |
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> What if I have each system save a copy of everything to be backed up |
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> from its own filesystem in a separate directory and change the |
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> ownership of everything in that directory so it can be read by an |
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> unprivileged backup user? |
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You've just reinvented the push backup =) |
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If separate-directory is on the same server, an attacker can log in and |
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overwrite all of your files with zeros. Those zeros will be pulled to |
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the backup server, destroying your backups. |
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If separate-directory is on the backup server... |
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