Username different from mailbox

[Patrick Kranz]

Hi Torsten, hi list,

first of all thanks for the many answers and thanks to torsten for 
making my question clear :)

so far, two possible solutions have been mentioned here:

- an inofficial cyrus patch or
- an imap/pop3 proxy server (perdition)

i had no chance to talk to my customer yet but i guess the proxy server 
will be the solution of our choice because i still can use the updates 
for the cyrus server provided by the distributor without the need to 
recompile it by hand every time there is an update.
i have investigated a little and found out, that perdition actually 
supports ldap, so it is possible to still keep all relevant data in the 
ldap-dit.

if anyone is interessted in the final setup and if it worked, don't 
hesitate to mail me but i think in the matter of this mailing list this 
case is closed :)

thanks for your help.

best regards,
patrick


Torsten Schlabach schrieb:
> Hi Patrick, hi all others,
>
> This is *not* an MTA issue at all as soon as we discuss the IMAP user 
> logging in rather than the MTA delivering mail!
>
> This has been discussed indeed several times already and every time it 
> came up, there were several people answering that they have no problem 
> with that all. Yet unfortunately, they weren't talking about what was 
> asked and what you need. (As long as I didn't get it wrong.)
>
> It is crucial in this discussion to distingish between two things:
>
> 1. Teach the MTA (Exim, Postfix, doesn't really matter) that mail for 
> x at y.com has to go to fillinwhatyoulike / what at have.you. Yes, this is a 
> no-brainer. So we discuss SMTP here, which isn't really a subject for 
> Cyrus IMAPd at all. And it's not what you're asking if I get it right.
>
> 2. In IMAP a user uses a name to identify himself against Cyrus IMAPd. 
> The respective data is flowing right from the MUA (not the MTA) to 
> port 143. Note: No Exim / Postfix / qmail in the game.
>
> Cyrus itself is indeed built on the assumtion that whatever name you 
> use to authenticate *is* the name of the mailbox you want to see.
>
> It is impossible to use any tricks in the LDAP backend to solve this. 
> You will be able to make LDAP lookup the credentials for userb if he 
> logs into Cyrus as usera (if you do whatever mapping in LDAP) but this 
> will always result in a "no mailbox with that name error" as Cyrus 
> IMAPd will authenticate correctly, but look for the wrong mailbox name.
>
> The only way to solve your (and my) problem will be a canon_user SASL 
> plugin, which does not yet exist.
>
> Well, sort of ...
>
> Howard Chu was so kind to write one which he provided to me as patch. 
> Due to a lack of time and maybe ability I was yet unable to make it 
> work for me. But I definitely trust him that when he says he had this 
> working for him, that the problem is with me and not with his code.
>
> So in case you are ready to compile your stuff from source, I will 
> happliy share the patch with you and I would be extremely thankfull if 
> you could help me with some hints on how to properly install that.
>
> Regards,
> Torsten
>
>
> Jorey Bump schrieb:
>> Patrick Kranz wrote:
>>
>>> Now I have a customer, who needs the scenario that the usernames for 
>>> Cyrus differ from the mailbox and mailaddress respectivly. For 
>>> example user1 at testdomain.com should be able to login with the 
>>> username someOtherUsername. This need arises from an integration 
>>> with other software-packages. Is there any possibility to make this 
>>> work?
>>
>>
>> Yes, this is no different from any other alias or virtual setup that 
>> offers multiple addresses to individual users. You would handle this 
>> in the MTA. For example, I use virtual_alias_maps with Postfix, and 
>> map all addresses to the corresponding cyrus IMAP user:
>>
>>  abuse at example.com        admin
>>  admin at example.com        admin
>>  postmaster at example.com        admin
>>  bob at example.com        bob
>>  robert.smith at example.com    bob
>>
>> You can also use the aliases file and other approaches.
>>
>>
>>
>> ----
>> Cyrus Home Page: http://cyrusimap.web.cmu.edu/
>> Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki
>> List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
> ----
> Cyrus Home Page: http://cyrusimap.web.cmu.edu/
> Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki
> List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html


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Epper & Kranz GbR
Oliver Epper, Patrick Kranz
EK IT-Solutions
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54634 Bitburg
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