* space in user name is not supported :) (anyway, space in name? ;o))
* just simple MD5 hash for password in file, tweak the script if you need something better

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openvpn server configuration:

'server.conf (somewhere)
	auth-user-pass-verify svpnas.pl via-file

Remember to change 'users.db' file path in the header of the script.

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structure of users.db file is very simple, just one by one - fields separated with space:
user1 pass1
user2 pass2

for example:
tomekk 1019da254350f4dccea3bc47d7bavfa3
user1 123f69jf42h362b1f740a36380a5ca81

You can use PERL for password hash generator:
perl -MDigest::MD5 -le 'print Digest::MD5->md5_hex("my_pass_here")';