- dovecot - dovecot.org

[Dovecot] /var/mail dotlocking workaround
by Timo Sirainen 16 Jun '04

16 Jun '04

I added "mail_extra_groups" setting which can be used to give imap/pop3 process access to additional groups. So what this means is if you set it to "mail" you can finally remove o-w access from /var/mail directory. Leaving the sticky bit could still be a good idea, so there's no way users to be able to delete each others inboxes. Here's a patch against 0.99.10.5: http://dovecot.org/patches/mail-extra-groups.diff

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[Dovecot] dovecot non-local users
by Tom Allison 16 Jun '04

16 Jun '04

From the docs: System without local users -------------------------- <snip> Having one uid per user would mean that in case of a security hole in Dovecot, the user still couldn't read other peoples mails. Use this if possible. ----- I don't quite understand this one. If you aren't a local user, what's the uid all about? Do I do something like: create a user for mydomain in /etc/passwd (eg: user:domain_dude, home:/var/dovecot) with a valid home/uid/gid. Plug in the uid/gid/home for domain_dude in the authentication and have a data structure of /var/dovecot/%d/%n/Maildir or %h/%d/%d/Maildir where %h = "/var/dovecot" via /etc/passwd. Something like that?

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[Dovecot] review of my configuration
by Tom Allison 16 Jun '04

16 Jun '04

Over the last week I've set up dovecot and imap and imaps support. I've even tried to break it but it's been doing very well. Now I'm trying to set up a webmail interface. Rather than use the common squirrelmail, I thought I would try openwebmail. Mainly because it's written in perl, of which I am a big fan. However, I ran into some errors in openwebmail that actually may tie back to dovecot. Here's how: dovecot configuration userdb = /etc/passwd passdb = pgsql.... ---this allows me to use the $HOME, uid, gid from the passwd file and not have to carry two copies of it (/etc/passwd and pgsql) However, under openwebmail I don't seem to have this option as they are really determined to require a home, uid, gid for each user that logs in. As witnessed by the following line: Tue Jun 15 20:23:34 2004 - [31572] (unknown) tallison - userinfo error - auth_pgsql.pl, ret -3, Can't execute SQL statement: ERROR: column "uid" does not exist Sure looks familiar doesn't it? (see, it's relevant!) Since I was thinking that maybe it might be interesting to do some email set up to support multiple domains and users some day, and I want to try out the openwebmail sooner than that. I'm getting the impression that it might be easier if I just made the leap today and started to reconfigure everything for multiple domain hosting and all the cool stuff. Now, I can probably muddle through this without too much internal damage. But I keep getting stuck on one point. How can I filter the delivery of email like I do with procmail, when I am delivering mail to many users, none of whom have a /etc/passwd entry? Are there any alternative ideas on how to do this?

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[Dovecot] cvs changelog
by Geo Carncross 15 Jun '04

15 Jun '04

FEI: the CVS changelog is no longer updating. cras's commits look like this: date: YYYY-MM-DD HH:MM:SS +TZDD; author cras; state Exp; lines +1 -0 but cvs2cl.pl (2.50) demands: date: YYYY/MM/DD HH:MM:SS; author cras; state: Exp; lines +1 -0 cvs2cl.pl version 2.55 still can't parse these lines. I patched my cvs2cl.pl so I could still follow dovecot, but I'm not certain these changes actually belong in cvs2cl.pl --- /s/2.55-orig/cvs2cl.pl 2004-06-15 18:58:54.000000000 +0000 +++ /s/2.55/cvs2cl.pl 2004-06-15 18:59:14.000000000 +0000 @@ -2286,7 +2286,7 @@ my ($year, $mon, $mday, $hours, $min, $secs, $author, $state, $rest) = $line =~ - m!(\d+)/(\d+)/(\d+)\s+(\d+):(\d+):(\d+);\s+ + m!(\d+)[/-](\d+)[/-](\d+)\s+(\d+):(\d+):(\d+)(?:.*?);\s+ author:\s+([^;]+);\s+state:\s+([^;]+);(.*)!x or die "Couldn't parse date ``$line''"; die "Bad date or Y2K issues"

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[Dovecot] SSL problems with imap-login
by Terje Rosten 15 Jun '04

15 Jun '04

I am using dovecot-0.99.10.5-1 on RHEL 3 for x86-64: $ uname -a Linux localhost 2.4.21-15.ELsmp #1 SMP Thu Apr 22 00:09:01 EDT 2004 x86_64 x86_64 x86_64 GNU/Linux The client is Horde-2.2.5/IMP-3.2 on Fedora Core 2 on i386. At random imap-login fails with the following error message: $ grep imap /var/log/maillog: Jun 15 18:01:08 anne imap-login: Login: terjeros [10.0.0.1] Jun 15 18:01:17 anne imap-login: Login: terjeros [10.0.0.1] Jun 15 18:15:25 anne imap-login: Login: terjeros [10.0.0.1] Jun 15 18:15:25 anne imap-login: SSL_accept() failed: error:1409C041:SSL routines:SSL3_SETUP_BUFFERS:malloc failure [10.0.0.1] Jun 15 18:15:47 anne imap-login: Login: terjeros [10.0.0.1] Jun 15 18:15:47 anne imap-login: SSL_accept() failed: error:1409C041:SSL routines:SSL3_SETUP_BUFFERS:malloc failure [10.0.0.1] Jun 15 18:16:00 anne imap-login: Login: terjeros [10.0.0.1] Jun 15 18:16:00 anne imap-login: SSL_accept() failed: error:1409C041:SSL routines:SSL3_SETUP_BUFFERS:malloc failure [10.0.0.1] Jun 15 18:16:25 anne imap-login: Login: terjeros [10.0.0.1] Jun 15 18:17:35 anne imap-login: Login: terjeros [10.0.0.1] Jun 15 18:19:43 anne imap-login: SSL_accept() failed: error:1409C041:SSL routines:SSL3_SETUP_BUFFERS:malloc failure [10.0.0.1] Jun 15 18:52:01 anne imap-login: Login: terjeros [10.0.0.1] Jun 15 18:52:01 anne imap-login: SSL_accept() failed: error:1409C041:SSL routines:SSL3_SETUP_BUFFERS:malloc failure [10.0.0.1] Jun 15 18:52:31 anne imap-login: Login: terjeros [10.0.0.1] Jun 15 18:52:53 anne imap-login: Login: terjeros [10.0.0.1] Jun 15 18:53:33 anne imap-login: Login: terjeros [10.0.0.1] Jun 15 18:54:30 anne imap-login: SSL_accept() failed: error:1409C041:SSL routines:SSL3_SETUP_BUFFERS:malloc failure [10.0.0.1] The box has plenty of memory: $ free | grep Mem Mem: 4016976 3696888 320088 0 731608 2279704 Any ideas? OpenSSL or dovecot issue? - Terje

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[Dovecot] flat file mailbox formats
by Timo Sirainen 15 Jun '04

15 Jun '04

I've tried to write the new mbox code in a way that it could be moved into generic flat-file library with mbox-specific code being implemented on top of that. The code would be useful for all formats that require modifying message headers to store the metadata. How many such are there? I suppose all such formats could be implemented by separating mails into 3 logical parts: - header ("From ...\n") - mail data (headers and body) - footer ("\n") Except keeping a separate header and footer is kind of annoying, my current code uses: - mail separator ("\nFrom ...\n") - first message header's skip counter: how many characters to remove from mail separator for the first message (1, for \n before the "From ..") - last message's footer Somewhat uglier, but I think all needed formats could be implemented with it? It's also simper and more efficient to implement.. Besides mbox, I know at least two variations which are used: AAAA-box: - I remember seeing this somewhere years ago, but I'm not sure if it's still used or if it has a real name.. - separator is four ^A characters (ascii 1) and LF - header skip counter is 5 - last message footer would be the same ^A^A^A^A\n dotbox: - mails are stored in SMTP format, ie. lines beginning with '.' are prefixed with another '.'. the '.' prefixes will have to be removed for IMAP, so this isn't as simple as others to implement. - separator is ".\n" - header skip counter is 2 - last message footer is ".\n" Any thoughts?

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[Dovecot] dovecot + Fedora core 1
by Pablo Endres 15 Jun '04

15 Jun '04

Hi, I've installed dovecot-0.99.10.5 using the rpm from Dag Wieers, but when I start it all I get is nothing (but none of the processes are running). I checked the config file and set it up (I'm trying to use it with mysql support, but it doesn't work with traditional config) Any ideas -- Pablo Endres <epablo(a)comvoz.com> ComVoz Communications USA: +1 954 343-2085 Ext 199 Venezuela: +58 212 7713195 Ext 199 Colombia: +57 1 3256840 Ext 199

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[Dovecot] Shared folders?
by Villalovos, John L 15 Jun '04

15 Jun '04

I haven't seen any info on this so I thought I'd ask. Is there support for shared IMAP folders? Quite a few people at work subscribe to the Linux Kernel Mailing List. I thought it would make more sense if there could be a shared LKML folder that they all could use. This would save disk space. Is this posssible? If so how? I am also looking into the idea of doing a local newsgroup of the mailing list but I don't have a news server software setup at the moment. John

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[Dovecot] 1.0-test15 released
by Timo Sirainen 15 Jun '04

15 Jun '04

http://dovecot.org/test/ Maildir code is still having syncing trouble. I thought about fixing mbox code for a chance - if the same problems happen with it too then I at least know that the problems are in indexes instead of maildir syncing itself. So, the biggest change in 1.0-test15 is a new fully functional superfast mbox code. If you can make it corrupt your mboxes I'd like to know about that. I haven't tested it too much yet, but I haven't seen corruption for a while anymore. Superfast as in: - Syncing and modifying the mbox is done in one integrated loop, no more passing through the whole mbox multiple times. - If we know the mbox is synced and we need to modify it, we directly jump to the message(s) needing modification and change only them. This means that with upcoming Dovecot LDA the mbox never needs to be fully parsed. As long as you're not expunging old messages, mboxes with sizes of even gigabytes should be no problem. Still a few remaining issues though: - It gets to infinite loop with 0 sized message body. I'll fix this soon - Recent counters are broken - mbox lock should be kept two extra seconds after syncing. that is required so that we can be sure no-one else has modified the mbox (ie. mtime changes every time) - APPEND command doesn't yet update indexes directly, so they still trigger a full sync - keywords aren't implemented - UW-IMAP style "FOLDER INTERNAL DATA" message is almost supported.. but not quite yet. We're going to use it if it exists, but we won't insert one ourself. This also brings to my mind supporting some other flatfile formats.. Well, I'll write another mail about that.

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[Dovecot] PAM_RHOST item
by Tom Alsberg 15 Jun '04

15 Jun '04

A little problem, which is bugging me: when using PAM authentication, Dovecot (0.99.5) does not set the PAM_RHOST item, so the PAM modules cannot know who the client is. We need this for some PAM module doing access control. Changing passdb-pam.c to pam_set_item it seems trivial, but I'm bugged as to how to get the client name from there. It seems not to be available in the auth_request strut or anything from there. I tried even adding an upwards reference from there to the struct client *, but then I see that there are three structs named client and two structs named auth_request, and somehow I got into trouble of passing it cleanly. Any help or guidance for it is greatly appreciated. (I know Dovecot 0.99 is not really under development and such stuff is done in Dovecot 1.0 now, but that's not yet stable and for now we're using 0.99 where it would help). Thanks, -- Tom -- Tom Alsberg - hacker (being the best description fitting this space) Web page: http://www.cs.huji.ac.il/~alsbergt/ DISCLAIMER: The above message does not even necessarily represent what my fingers have typed on the keyboard, save anything further.

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