- Dovecot-news - dovecot.org

1.0.rc21 released
by Timo Sirainen 02 Feb '07

02 Feb '07

http://dovecot.org/releases/dovecot-1.0.rc21.tar.gz http://dovecot.org/releases/dovecot-1.0.rc21.tar.gz.sig Just one fix. Maybe the one big thing in Dovecot v2.0.* will be a test suite, which is run before any release. :) - Cache file handling could have crashed rc20

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1.0.rc20 released
by Timo Sirainen 02 Feb '07

02 Feb '07

http://dovecot.org/releases/dovecot-1.0.rc20.tar.gz http://dovecot.org/releases/dovecot-1.0.rc20.tar.gz.sig So, rc19 was somewhat broken. How about this version? + dovecot: Added --log-error command line option to log an error, so the error log is easily found. + Added mail_log_max_lines_per_sec setting. Change it to avoid log throttling with mail_log plugin. - Changing message flags was more or less broken in rc19 - ACL plugin still didn't work without separate control directory - Some mbox handling fixes, including fixing an infinite loop - Some index file handling fixes - maildir quota: Fixed a file descriptor leak - If auth_cache was enabled and userdb returned "user unknown" (typically only deliver can do that), dovecot-auth crashed. - mail_log plugin didn't work with pop3

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1.0.rc19 released
by Timo Sirainen 23 Jan '07

23 Jan '07

http://dovecot.org/releases/dovecot-1.0.rc19.tar.gz http://dovecot.org/releases/dovecot-1.0.rc19.tar.gz.sig Just did a few more fixes to index files. Do they help with anyone's problems? - ACL plugin didn't work unless control dir was separate from maildir - More index file handling fixes

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1.0.rc18 released
by Timo Sirainen 22 Jan '07

22 Jan '07

http://dovecot.org/releases/dovecot-1.0.rc18.tar.gz http://dovecot.org/releases/dovecot-1.0.rc18.tar.gz.sig I think we're quite near v1.0 now. * ACL plugin + Maildir: Moved dovecot-acl file from control directory to maildir. To prevent accidents caused by this change, Dovecot kills itself if it finds dovecot-acl file from the control directory. * When opening a maildir, check if tmp/'s atime is over 8h old. If it is, delete files in it with ctime older than 36h. However if atime - ctime > 36h, it means that there's nothing to be deleted and the scanning isn't done. We update atime ourself if filesystem is mounted with noatime. * base_dir doesn't need to be group-readable, don't force it. * mail_read_mmaped setting is deprecated and possibly broken. It's now removed from dovecot-example.conf, but it still works for now. * Removed also umask setting from dovecot-example.conf since currently it doesn't do what it's supposed to. + Authentication cache caches now also userdb data. + Added mail_log plugin to log various mail operations. Currently it logs mail copies, deletions, expunges and mailbox deletions. - dict quota: messages=n parameter actually changed storage limit. - A lot of fixes to handling index files. This should fix almost all of the problems ever reported. - LDAP: auth_bind=yes was more or less broken. - Saved mails and dovecot-keywords file didn't set the group from dovecot-shared file. - Fixed potential assert-crash while searching messages - Fixed some crashes with invalid X-UID headers in mboxes - If you didn't have a namespace with empty prefix, giving STATUS command for a non-existing namespace caused the connection to give "NO Unknown namespace" errors for all the future commands.

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1.0.rc17 released
by Timo Sirainen 07 Jan '07

07 Jan '07

http://dovecot.org/releases/dovecot-1.0.rc17.tar.gz http://dovecot.org/releases/dovecot-1.0.rc17.tar.gz.sig - MySQL authentication caused username to show up as "OK" in rc16.

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1.0.rc16 released
by Timo Sirainen 05 Jan '07

05 Jan '07

http://dovecot.org/releases/dovecot-1.0.rc16.tar.gz http://dovecot.org/releases/dovecot-1.0.rc16.tar.gz.sig If you've had problems with getting errors about index files sometimes being corrupted, please try if this release fixes it. If you've reported any bugs that this release hasn't fixed, please report them again so I know they still didn't get fixed and that I didn't forget them. * IMAP: When trying to fetch an already expunged message, Dovecot used to just disconnect client. Now it instead replies with dummy NIL data. * Priority numbers in plugin names have changed. If you're installing from source, you should delete the existing plugin files before installing the new ones, otherwise you'll get errors. * Maildir: We're using rename() to move files from tmp/ to new/ now. See http://wiki.dovecot.org/MailboxFormat/Maildir -> "Issues with the specification" for reasoning why this is safe. This makes saving mails faster, and also makes Dovecot usable with Mac OS X's HFS+ (after you also set dotlock_use_excl=yes, see below). + Added dotlock_use_excl setting. If enabled, dotlocks are created directly using O_EXCL flag, instead of by creating a temporary file which is hardlinked. O_EXCL is faster, but may not work with NFS. + If Dovecot crashes with Linux or Solaris, it'll log a "Raw backtrace". It's worse than gdb's backtrace, but better than nothing. + Added maildir_copy_preserve_filename=yes setting. + Added a lazy-expunge plugin to allow users to unexpunge their mails. + maildir quota: Added ignore setting to maildir quota, which allows ignoring quota in Trash mailbox. + dict quota: If dictionary doesn't yet contain the quota, calculate it by going through all the mails in all the mailboxes. + login_log_format_elements: Added %a=local port and %b=remote port + Added -i and -o options to rawlog to restrict logging only to input or output. - Doing a STATUS command for a selected mailbox (not a recommended IMAP client behavior) caused Dovecot to sync the mailbox silently. This could have lost eg. EXPUNGE events from clients, causing them to use wrong sequence numbers. - deliver was treating boolean settings set to "no" as if they were "yes" (they were supposed to be commented out for "no") - Running "dovecot" with -a or -n option while Dovecot was running deleted all authentication sockets, which caused all the future logins to fail. - maildir: RENAME and DELETE didn't touch control directory if it was different from maildir or index dir. - We treated internal userdb lookup errors as "user unknown" errors. In such situations this caused deliver to think the user didn't exist and the mail get bounced. - pam: Setting cache_key crashed - shared maildir: dovecot-keywords file's mode wasn't taken from dovecot-shared file. - dovecotpw wasn't working with PowerPC

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1.0.rc15 released
by Timo Sirainen 19 Nov '06

19 Nov '06

http://dovecot.org/releases/dovecot-1.0.rc15.tar.gz http://dovecot.org/releases/dovecot-1.0.rc15.tar.gz.sig * Fixed an off-by-one buffer overflow in cache file handling. The code is executed only with mmap_disable=yes and only if index files are used (ie. INDEX=MEMORY is safe). * passdb checkpassword: Handle vpopmail's non-standard exit codes. - rc14 sometimes assert-crashed if .log.2 file existed in a mailbox (earlier versions leaked memory and file descriptors) - io_add() assert-crashfixes - Potential SSL hang fix at the beginning of the connection

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Security hole #2: Off-by-one buffer overflow with mmap_disable=yes
by Timo Sirainen 19 Nov '06

19 Nov '06

Version: 1.0test53 .. 1.0.rc14 (ie. all 1.0alpha, 1.0beta and 1.0rc versions so far). 0.99.x versions are safe (they don't even have mmap_disable setting). Problem: When mmap_disable=yes setting is used, dovecot.index.cache file is read to memory using "file cache" code. It contains a "mapped pages" bitmask buffer. In some conditions when updating the buffer it allocates one byte too little. Exploitability: I think it's going to be pretty difficult to cause anything else than a crash, but I wouldn't say impossible. Only logged in IMAP/POP3 users can exploit this. In theory you might be able to exploit this for other users as well by sending them a lot of specially crafted emails, but this requires knowing what dovecot.index.cache file contains. Normally its contents can't be predicted, although perhaps with POP3 users it gets empty often enough that the exploit could be tried. Then again, the exploit requires having at least 4MB cache file, which won't happen with POP3 users before the mailbox has about 170k mails (if I counted right). With IMAP the cache file is used more, so it's easier to fill the 4MB with for example a lot of To-headers. Workaround: Use INDEX=MEMORY so the cache files aren't used at all. Fix: 1.0.rc15 fixes this. You can also use this patch: http://dovecot.org/patches/1.0/file-cache-buffer-overflow-fix.diff

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1.0.rc14 released
by Timo Sirainen 12 Nov '06

12 Nov '06

http://dovecot.org/releases/dovecot-1.0.rc14.tar.gz http://dovecot.org/releases/dovecot-1.0.rc14.tar.gz.sig More fixes. "Duplicate header extension keywords" is the only known problem (or if I forgot something, remind me). I'll try to figure out a way to reproduce it easily and then get it fixed. * LDAP: Don't try to use ldap_bind() with empty passwords, since Windows 2003 AD skips password checking with them and just returns success. * verbose_ssl=yes: Don't bother logging "syscall failed: EOF" messages. No-one cares about them. + Dovecot sources should now compile without any warnings with gcc 3.2+ - rc13 crashed if client disconnected while IDLEing - LDAP: auth_bind=yes fixes - %variables: Fixed zero padding handling and documented it. %0.1n shouldn't enable it, and it really shouldn't stay for the next %variable. -sign also shouldn't stay for the next variable. - Don't leak opened .log.2 transaction logs. - Fixed a potential hang in IDLE command (probably really rare). - Fixed potential problems with client disconnecting while master was handling the login. - quota plugin didn't work in Mac OS X

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1.0.rc13 released
by Timo Sirainen 08 Nov '06

08 Nov '06

http://dovecot.org/releases/dovecot-1.0.rc13.tar.gz http://dovecot.org/releases/dovecot-1.0.rc13.tar.gz.sig I'll just keep on making new releases now whenever something important is fixed. Hopefully there shouldn't be many left anymore. Most of the bugs fixed in this release were found by stress testing with my imaptest tool (http://dovecot.org/tools/imaptest.c) If you're interested in knowing how perfectly your Dovecot setup works (especially if you're using NFS), you could try the tool yourself also. I still see one crash with mmap_disable=yes, but it's pretty rare. Will see if I get it fixed before v1.0, but it's not that important. + deliver: If we're executing as a normal system user, get the HOME environment from passwd if it's not set. This makes it possible to run deliver from .forward. - Older compilers caused LDAP authentication to crash - Dying LDAP connections weren't handled exactly correctly in rc11, although it seemed to work usually - Fixed crashes and memory leaks with AUTHENTICATE command - Fixed crashes and leaks with IMAP/POP3 proxying - maildir: Changing a mailbox while another process was saving a message there at the same may have caused the changes to not be made into the maildir, which could have caused other problems later..

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