sasldb2 and hostnames

[Aleksandar Milivojevic]

I'm rather new to Cyrus and SASL (actually, I'm still experimenting with 
it, and with various available forms of authentications).

There is one question about sasldb2 authentication mechanism and 
hostnames.  If I understood correctly, with sasldb2, keys are 
user at hostname.  So if I use saslpasswd2 -c user, it will add 
user at hostname to sasldb2 file.  When cyrus-imapd authenticates user, it 
will look up user at hostname.

What happens if I change hostname to newhost?  I guess in that case, 
authentication will start failing.  Database contains user at hostname, and 
cyrus-imapd will be looking up user at newhost.

Is there an easy way of converting entries in sasldb2 file after the 
hostname change, to update only the hostname part?

Or can I (in some configuration file) instruct saslpasswd2 and 
cyrus-imapd not to use host name, but rather domain name (insted of 
user at foo.bar.com, use user at bar.com)?  I found there's -u option to 
saslpasswd2 (so there's one way to do it, although doing it in 
configuration file would be prefered).  But how about cyrus-imapd?  The 
only similar option is loginrealms, but that one doesn't do what I need 
(it allows logins from specfied realms, but does not change default 
realm).  There are some other options conataing "realm" word, but for 
most part they don't sound as they are what I would need (at least the 
way they are documented).

I've went through (well, at least some) of the documentation, and 
attempted to Google around, checked comp.mail.imap, and archives of this 
mailing list, but wasn't able to find answers (other than one web page 
warning that if hostname is changed after the users are set up, they 
won't be able to authenticate).

-- 
Aleksandar Milivojevic <amilivojevic at pbl.ca>    Pollard Banknote Limited
Systems Administrator                           1499 Buffalo Place
Tel: (204) 474-2323 ext 276                     Winnipeg, MB  R3T 1L7
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