FreeBusy with RFC6638 "Scheduling Extensions to CalDAV": 5.1; Service unavailable

[Ken Murchison]

On 4/14/20 10:22 PM, Anatoli wrote:
> Hi All,
>
> I'm experimenting with freebusy support in Cyrus paired with Thunderbird.
>
> The manual [1] details the freebusy URL functionality and it works
> correctly (if retrieved manually). But TB, AFAICU, doesn't support it.
> Instead, it supports rfc6638 "Scheduling Extensions to CalDAV"
> (https://wiki.mozilla.org/Lightning_implementing_RFC6638).
>
> The Cyrus documentation doesn't say explicitly if any of this is
> supported, but when enabled:
>
> httpmodules: webdav caldav freebusy ischedule
>
> I can't make Cyrus return the correct info. Instead it replies with
> "5.1;Service unavailable" (below goes an example exchange).
>
> Is this rfc supported? If yes, why may it not work as expected? I'm
> testing it now with v3.0.5 as this is what I have at one deployment. I
> can update it if there were relevant changes in later versions.
>
> Thanks,
> Anatoli
>
> [1]
> https://www.cyrusimap.org/dev/imap/download/installation/http/caldav.html#freebusy-url
>
>
> <1586914170<POST /dav/calendars/user/aaa%40bbb.xyz/Outbox/ HTTP/1.1
> Accept: text/xml
> Content-type: text/calendar; charset=utf-8
> Connection: keep-alive
> Accept-charset: utf-8,*;q=0.1
> Recipient: mailto:ttt at bbb.xyz
> Content-length: 396
> Host: mail.bbb.xyz
> User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
> Thunderbird/60.9.1 Lightning/6.2.5
> Pragma: no-cache
> Originator: mailto:aaa at bbb.xyz
> Accept-language: en-GB,en;q=0.5
> Authorization: Basic ...
> Cache-control: no-cache
> Accept-encoding: gzip, deflate, br
>
> BEGIN:VCALENDAR
> PRODID:-//Mozilla.org/NONSGML Mozilla Calendar V1.1//EN
> VERSION:2.0
> METHOD:REQUEST
> BEGIN:VFREEBUSY
> DTSTAMP:20200415T012930Z
> ORGANIZER:mailto:aaa at bbb.xyz
> DTSTART:20200417T030000Z
> DTEND:20200503T030000Z
> UID:e7381fb8-f437-4772-b0ec-b019b909c50f
> ATTENDEE;PARTSTAT=NEEDS-ACTION;ROLE=REQ-PARTICIPANT;CUTYPE=INDIVIDUAL:mail
>   to:ttt at bbb.xyz
> END:VFREEBUSY
> END:VCALENDAR
>> 1586914170>HTTP/1.1 200 OK
> Date: Wed, 15 Apr 2020 01:29:30 GMT
> Strict-Transport-Security: max-age=600
> Cache-Control: no-cache
> Content-Type: application/xml; charset=utf-8
> Content-Length: 317
>
> <?xml version="1.0" encoding="utf-8"?>
> <C:schedule-response xmlns:C="urn:ietf:params:xml:ns:caldav" xmlns:D="DAV:">
>    <C:response>
>      <C:recipient>
>        <D:href>mailto:ttt at bbb.xyz</D:href>
>      </C:recipient>
>      <C:request-status>5.1;Service unavailable</C:request-status>
>    </C:response>
> </C:schedule-response>


This response looks like Cyrus thinks that ttt at bbb.xyz is a remote user 
and is trying to send the free/busy request over email.

Try adding the following option to imapd.conf:

calendar_user_address_set: bbb.xyz


-- 
Ken Murchison
Cyrus Development Team
Fastmail US LLC