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[Dovecot] [PATCH] OpenSSL RNG initialization
by Vilmos Nebehaj 25 Mar '06

25 Mar '06

Hi, dovecot tries to use OpenSSL's PRNG to generate random numbers if there is no /dev/urandom found. Unfortunately, it is flawed in its present form, since the PRNG is not seeded before RAND_bytes() is called in src/lib/randgen.c (on systems which have /dev/urandom, OpenSSL automatically seeds its PRNG from the urandom device). Here's a patch to address this issue: it tries to seed the PRNG if there is no /dev/urandom present (which is likely the case if dovecot uses OpenSSL's RAND API). It can also be fetched from http://innoidea.com/~vili/dovecot_rng_init.diff -Vilmos Nebehaj Index: configure.in =================================================================== RCS file: /home/cvs/dovecot/configure.in,v retrieving revision 1.266 diff -u -r1.266 configure.in --- configure.in 28 Feb 2006 08:36:41 -0000 1.266 +++ configure.in 10 Mar 2006 17:15:01 -0000 @@ -358,7 +358,8 @@ AC_CHECK_FUNCS(fcntl flock lockf inet_aton sigaction getpagesize madvise \ strcasecmp stricmp vsnprintf vsyslog writev pread \ setrlimit setproctitle seteuid setreuid setegid setresgid \ - strtoull strtouq setpriority quotactl getmntent kqueue kevent) + strtoull strtouq setpriority quotactl getmntent kqueue kevent \ + getrusage) dnl * I/O loop function have_ioloop=no Index: src/lib/lib.h =================================================================== RCS file: /home/cvs/dovecot/src/lib/lib.h,v retrieving revision 1.20 diff -u -r1.20 lib.h --- src/lib/lib.h 25 Sep 2005 10:44:04 -0000 1.20 +++ src/lib/lib.h 10 Mar 2006 17:15:02 -0000 @@ -20,6 +20,13 @@ # include <stdint.h> /* C99 int types, we mostly need uintmax_t */ #endif +#ifdef HAVE_SYS_TIME_H +# include <sys/time.h> +#endif +#ifdef HAVE_SYS_TIME_H +# include <sys/resource.h> +#endif + #include "compat.h" #include "macros.h" #include "failures.h" Index: src/lib/randgen.c =================================================================== RCS file: /home/cvs/dovecot/src/lib/randgen.c,v retrieving revision 1.13 diff -u -r1.13 randgen.c --- src/lib/randgen.c 6 Jan 2005 19:08:19 -0000 1.13 +++ src/lib/randgen.c 10 Mar 2006 17:15:03 -0000 @@ -81,6 +81,42 @@ return buf; } +static void random_init_rng(void) +{ + int counter = 0; + struct timeval tv; +#ifdef HAVE_GETRUSAGE + struct rusage ru; +#endif + + /* + * If the RNG is already seeded, we can return + * immediately. + */ + if (RAND_status() == 1) + return; + + /* + * Else, try to seed it. Unfortunately we don't have + * /dev/urandom, so we can only use weak random sources. + */ + while (RAND_status() != 1) { + if (gettimeofday(&tv, NULL) < 0) + i_fatal("gettimeofday() failed: %m"); + RAND_add((const void *)&tv, sizeof(tv), + (double)sizeof(tv) / 2); +#ifdef HAVE_GETRUSAGE + if (getrusage(RUSAGE_SELF, &ru) < 0) + i_fatal("getrusage() failed: %m"); + RAND_add((const void *)&ru, sizeof(ru), + (double)sizeof(ru) / 2); +#endif + + if (counter++ > 100) + i_fatal("could not get enough entropy"); + } +} + void random_fill(void *buf, size_t size) { if (RAND_bytes(buf, size) != 1) @@ -91,6 +127,8 @@ { unsigned int seed; + random_init_rng(); + random_fill(&seed, sizeof(seed)); srand(seed); }

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[Dovecot] Message Filenames
by Charlie Davis 25 Mar '06

25 Mar '06

Is there anyway to get a message's filename through the imap server? I've been developing a program for awhile and just switched to dovecot from courier. Courier had a file that for every line was like: <message uid> <message filename> Is there anway to get this information out of dovecot? -Charlie

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[Dovecot] first crack at auto-trash plugin
by David Powers 25 Mar '06

25 Mar '06

I have written an alpha version of an auto trash plugin for dovecot. When compiled in any mail expunged from a non-Trash folder is moved to a folder named Trash. As of yet the folder is not created if it doesn't exist (the process fails before expunge). I would appreciate feedback of any sort. In addition, I am currently getting an error I haven't been able to puzzle out in the logs when it runs: Mar 21 15:22:01 david dovecot: imap(david(a)grayskies.net): Timeout leak: 0x807fad0 I see that it seems to relate to transactions somehow, but my few hours of playing with dovecot haven't given me the answer - so ideas/patches to the code would also be nice. You can grab it here: http://wrath.grayskies.net/tarballs/auto-trash.tar.gz -David

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[Dovecot] Dovecot LDA + Fedora destribution = no go?
by Charlie Davis 25 Mar '06

25 Mar '06

Anyone know of a way to get the LDA to work on the fedora distribution available on yum? I'm a big fan of the whole yum-auto-updating thing but if this isn't possible, I'll go tarball. -Charlie

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[Dovecot] Method of archiving mail?
by Stephen Allen 24 Mar '06

24 Mar '06

Hello I have a situation in which a number of users have 10,000+ messages in the maildir, going back a few years. I'm not a fan of this many files lying around so I'd like to set up some kind of archiving, but one that will allow user's access to the old mails should they wish to see them. I thought of a cron job trying to sift through messages pulling those what were older than x days, then writing some script to process a request from a user (date/time/from/to/subject/body text) and copy matching messages to a "query" folder in the maildir. However, a) I'm not good at this kind of thing, and b) I have a feeling it's already been done before. Can anyone point me in the right direction please... is their software around to do this already? Many thanks, Steve :)

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[Dovecot] Imap Timeouts
by Neil Wilson 24 Mar '06

24 Mar '06

Hi guys, I've got a client running 1.0.beta3 on SuSe 9.3 Everything has been running perfectly since it was installed about 6 months ago, but lately they've had issues with email clients not being able to connect to the IMAP server, until they close their clients(Thunderbird & Outlook) and then re-open them. They have roughly 70 users on their network, so it sounds like it could be too many active sessions at once, but I've tried changing a few things in the config, and so far nothing has resolved this. Any help would be appreciated. Regards. Neil Wilson Powered by Linux, driven by passion! -- This email and all contents are subject to the following disclaimer: http://www.dcdata.co.za/emaildisclaimer.html

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[Dovecot] Can Dovecot 'slurp' into the INBOX from a mail spool file?
by Daniel Watts 23 Mar '06

23 Mar '06

Hi guys, I have a system whereby I am forced to deal with mbox files of /var/spool/mail/user1 (mbox text file) /var/spool/mail/user2 (mbox text file) etc Their mail homes are maildir format in: /home/user1/Maildir/{cur,new,tmp} /home/user2/Maildir/{cur,new,tmp} etc I can set things up so that the mbox inbox is shown using namespaces: namespace private { separator = / prefix = location = maildir:/home/virtual/%d/home/%n/Maildir/ } namespace private { separator = / prefix = mail/ inbox = yes hidden = no location = mbox:/home/virtual/%d/home/%n/mail/:INBOX=/home/virtual/%d/var/spool/mail/%n } This gives a rather odd folder structure as follows: INBOX Sent Drafts Trash mail/ --- INBOX myfolder1 myfolder2 Both of those INBOXes are actually the same folder. I'd ideally like to hide the mbox namespace entirely so that the user does not see any mbox folders. UW IMAP, with it's mbx format, allows you to just drop in a file called INBOX in mbx format and it will 'slurp' the /var/spool/mail/usersmbox file into the mbx INBOX. Has/could Dovecot have a similar feature whereby you specify a spool folder which is then 'slurped' into the local maildir INBOX? Not sure if I'm being clear enough here - do let me know if not! Much thanks, Daniel

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[Dovecot] spam filtering with amavis
by Bas van den Dikkenberg 23 Mar '06

23 Mar '06

I'm filtering that is being deliverd to postfix mail server with amavisd-new . I want spam with spam f level 1 - 8 to ad a tag any everything above to be delete is this posebol? If yes how? Met vriendelijk groet, Bas van Dikkenberg GISkit bv BFVD1-RIPE Tel: +3130-6340430 Fax: +3130-6342433 Prive Tel: +3130-6372769 Mob: +316-52384841

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[Dovecot] dovecot customflags/keywords
by sezai.karatoz 23 Mar '06

23 Mar '06

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[Dovecot] Losing messages
by Stian Jordet 23 Mar '06

23 Mar '06

Hi, I have been running dovecot cvs happily for.. well.. very, very long now. Don't remember when I switched from 0.99, but it was back in the test-days, long before the alpha's. Anyway, it seems to have been working very well all the time. But recently three of my clients have claimed to have lost mail when moving from Thunderbird. I even experienced it myself once. I'm using Evolution 99% of the time, and have never seen any problems with that - but that doesn't mean the problem only occurs with Thunderbird. When moving mail from one folder to another, everything seems fine, except that the mail isn't in any folder anymore. It _seems_ related to this: Mar 14 14:46:53 buick dovecot: imap(larsmj): Fixed index file /home/larsmj/Maildir/.Junk/dovecot.index: first_recent_uid_lowwater 40 -> 36 Mar 14 14:46:53 buick dovecot: imap(larsmj): Corrupted index file /home/larsmj/Maildir/.Junk/dovecot.index: Duplicate header extension keywords But I'm not sure. Either way I get these lines rather often for some users. What does it mean? Anyone seen anything like it? I really don't like the idea of losing clients mail... I hope someone can shed some light on this. Best regards, Stian

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