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I have an FTP server running on OS X Server 10.6 and I would like to migrate it to CentOS. Is it possible to migrate user passwords from OS X Server to Linux?

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In general securely stored password (those stored with a strong salted hash, etc) can't be migrated any more than they can be easily cracked. In almost all cases of migrations such as these mass password resets are inevitable. – adric Oct 12 '12 at 22:00

No. MacOS server stores the passwords in it's own proprietary password database and there is no way that I know of to get the passwords out of it in any usable form.

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Oh, they store it in a regular SHA-512 format. But anyways, that's not necessarily compatible to what Linux is using - md5 or sha-1, at it's best. Since I don't know if you can set the Linux-shadows to SHA-512 I didn't bother to answer this question. It's out of my expertise... – Alexander Janssen Oct 12 '12 at 21:41

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