- dovecot - dovecot.org

[Dovecot] Documentation
by Enrique 15 Aug '05

15 Aug '05

Hello, I have added a few questions and answers to the wiki, about stuff that caused me long hunts when trying to set up dovecot with maildir storage. Some of it I have gleaned from the source. Some of it is actually already documented, but I had not been able to spot it when I needed it. At the time of writing I had a particular advantage: I did not know, or had mostly forgotten, the peculiarities of the imap protocol. I say 'advantage', because I think that when writing documentation it is important, yet difficult, to see things from the perspective of a user that is quite ignorant, although not stupid. These need the documentation most, and they are in majority. (Some will say the "stupid" ones are in majority, but writing for them is almost futile anyway. Anyway, I doubt they are a majority; average intelligence is adequate for all normal tasks. What we often judge and condemn as "stupidity" is most often the result of a different perspective that _we_ are too limited to understand.) Since I am not yet too spoiled, and yet recently had my hands (or rather my eyes) in the source, this may be a golden opportunity to produce some more documentation. I therefore urge you to suggest what I should look at and write about. Do you have any ideas about how the documentation should be organized? some questions are not strictly dovecot or even imap questions, yet they arise quite naturally for an administrator that is migrating to dovecot or to imap in general. The existing migration documentation was not as usefull to me as it could have been because I was both migrating to imap from a non-imap solutions, and from mbox to maildir, both at the same time. That placed me in a particularly "ignorant" position. It is quite likely that much of what I write is not exactly true. I have suggested procmail as a delivery agent for maildir stores, because it is the only one I know about at the moment. I just occurred to me that I have not even checked if /bin/mail (on GNU/Linux systems) can do it. Any ideas? I have not (yet) found out anything about the CONTROL= part of the mail environment. Should I write something about it? Is it usefull for system administrators to know about it? What is it? Regards -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/

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[Dovecot] Binc IMAP "IMAPdir" style layout
by Martin Lucina 15 Aug '05

15 Aug '05

Hi, I'm in the process of migrating several years worth of mail to be accessible via an IMAP server. Some time ago, I evaluated both Binc IMAP and Dovecot and found Dovecot to be much faster on large folders, which is quite important to me. One thing I did not however manage to determine from the documentation on namespaces is whether or not it is possible to implement what Binc IMAP calls an "IMAPdir" style layout. IMAPdir lets me layout mailboxes in the filesystem like so: $HOME/ Maildir/ <---- users mail goes here Mail/ <---- IMAP root INBOX -> ../Maildir/ <---- (symlink) folder/ <---- some other mailbox in Maildir format folder.subfolder/ <---- '.' is the hierarchy separator folder.subfolder-2/ other-folder/ So IMAP clients subscribe to 'INBOX' and 'folder' and 'folder/subfolder' respectively. This gives me two features that I want: 1) The ability to easily access all my mail using a command line Maildir capable client such as nail, for when I'm connection over a super-slow SSH over GPRS connection. Also, I can actually see my folders (and their subfolders) without having to look for Maildir++ style names with 'ls -a' (e.g. Maildir/.subfolder/). 2) Mail folders are organized logically, unlike the standard Maildir++ layout where everything is a subfolder of 'INBOX', which strikes me as stupid. Is such a thing possible with Dovecot? Any help would be much appreciated. Thanks, -mato

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[Dovecot] Plugin development
by Sebastjan Trepca 15 Aug '05

15 Aug '05

Hi, I have a few questions regarding copy and save_finish methods. How can I get a filename or processing mail from the parameters you get in that methods? How could I use the logger you use for dovecot inside my plugin? Thanks, Sebastjan

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[Dovecot] migration from bincimap to dovecot (imaps)
by Andrea Riela 15 Aug '05

15 Aug '05

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi folks, I've installed dovecot 0.99.14 (last port on my freebsd system), and now I've to migrate from bincimap. My system uses qmail with vpopmail (uid/gid 89) and Maildir format. Well, now the authentication is ok, but when I try to connect to mailbox I receive an error like "IMAP command SELECT failed". My dovecot.conf: protocols = imaps imaps_listen = 192.168.17.10:993 ssl_disable = no ssl_cert_file = /var/qmail/certs/mail.nesys.it_cert.pem ssl_key_file = /var/qmail/certs/mail.nesys.it_key.pem log_path = /var/log/dovecot.log info_log_path = /var/log/dovecot.log login_user = dovecot first_valid_uid = 89 last_valid_uid = 89 first_valid_gid = 89 last_valid_gid = 89 ... default_mail_env = maildir:/usr/local/vpopmail/domains/%d/%u/Maildir ... auth_userdb = vpopmail auth_passdb = vpopmail auth_user = root My Maildir directory: elessar# ls -la total 520 drwx------ 5 vpopmail vchkpw 512 Jul 11 12:40 . drwx------ 3 vpopmail vchkpw 512 Feb 7 12:10 .. - -rw------- 1 vpopmail vchkpw 23 Jul 11 10:43 .bincimap-subscribed - -rw------- 1 vpopmail vchkpw 307344 Jul 11 12:40 bincimap-cache - -rw------- 1 vpopmail vchkpw 75 Jul 11 12:39 bincimap-uidvalidity drwx------ 2 vpopmail vchkpw 190464 Jul 11 12:40 cur drwx------ 2 vpopmail vchkpw 512 Jul 11 12:39 new drwx------ 2 vpopmail vchkpw 512 Jul 11 12:18 tmp - -rw------- 1 vpopmail vchkpw 75 Jun 23 15:09 uidvalfilename I've forgotten something? Any advice will be appreciated :) Regards Andrea -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (Darwin) iD8DBQFC0k92MakHrsrHP9wRAgIrAJ9rkNALg2l/ZoJ5+YyChw5SLhXDtACgyA4T VHnceVpLb1VO9Nm5GeyLIN8= =SEHK -----END PGP SIGNATURE-----

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[Dovecot] IMAP can't read inbox: istream_raw_mbox_get_body_size assertion failed
by Paul Schreiber 15 Aug '05

15 Aug '05

Yesterday, I upgraded my debian packages from 0.99.14 to 0.99.20050712-2. IMAP service has not been reliable since, and I was seeing crashes with one user. I tried deleting the user's .subscriptions and .imap folders, and forcing the client (Mac OS X's Mail.app) to redownload everything, but that resulted in an empty inbox. Here's what I have: # dpkg -l dovecot* Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed |/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad) ||/ Name Version Description +++-=====================-=====================-========================================================== ii dovecot 0.99.14-1 dummy package for upgrades to dovecot IMAP and POP3 server ii dovecot-common 0.99.20050712-2 secure mail server that supports mbox and maildir mailboxe ii dovecot-imapd 0.99.20050712-2 secure IMAP server that supports mbox and maildir mailboxe ii dovecot-pop3d 0.99.20050712-2 secure POP3 server that supports mbox and maildir mailboxe Here's what's in mail.log: Aug 13 15:09:10 sandbox dovecot: imap-login: Login: stan [70.48.39.107] Aug 13 15:09:10 sandbox dovecot: IMAP(stan): file istream-raw-mbox.c: line 383 (istream_raw_mbox_get_body_size): assertion failed: (rstream->body_offset != (uoff_t)-1) Aug 13 15:09:10 sandbox dovecot: child 6748 (imap) killed with signal 6 I got a core dump. Here it is: # gdb /usr/lib/dovecot/imap core (gdb) bt full #0 0x4004d83b in raise () from /lib/tls/libc.so.6 #1 0x4004efa2 in abort () from /lib/tls/libc.so.6 #2 0x08096fcb in i_set_failure_file () #3 0x08096ac7 in i_panic () #4 0x0807070f in istream_raw_mbox_get_body_size () #5 0x0806d1de in mbox_sync_has_changed () #6 0x0806eb50 in mbox_sync () #7 0x0806f9e7 in mbox_storage_sync_init () #8 0x0805ead5 in imap_sync_nonselected () #9 0x08057508 in _cmd_select_full () #10 0x080576d1 in cmd_select () #11 0x08058bf6 in _client_input () #12 0x0809c0c1 in io_loop_handler_run () #13 0x0809b65b in io_loop_run () #14 0x080602aa in main () I downgraded to 0.99.14 and put in the old configuration file and it seems to be working now. What's going on? Paul

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[Dovecot] Authentication based on client host
by Sebastjan Trepca 15 Aug '05

15 Aug '05

Hi, I am wondering if it's possible to authenticate users that come from specific IP differently then other users. I will be authenticating them by postgresql so something like this would be very useful: password_query = SELECT password from get_user('%username','%host') Is that possible? Can it be done any other way? Thanks, Sebastjan

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[Dovecot] Upgraded from 0.99 to 1.0 stable on FC3
by Obantec Support 15 Aug '05

15 Aug '05

Hi I upgraded to 1.0 stable and saw this in the maillog UIDs broken with partial sync in mbox file /var/spool/mail/thejohns_brian i am using mbox files with default_mail_env = mbox:/var/spool/mail/%u Is this a problem that i should worry about? Mark

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[Dovecot] hangs on dovecot test77, mutt
by Tzafrir Cohen 15 Aug '05

15 Aug '05

Hi My toy mail server runs dovecot. My client is mutt, which I use normally use a a remote screen session. I normally connect to imap locally: account-hook imap://localhost/ 'set tunnel="/usr/local/bin/imap-local"' After a long frustration from the new mail notification in 0.99, I have decided to bite the bullet and try the -test series. Ever since I have not had stable mutt sessions. Occasionally mutt hangs on the imap connection. Usually when openning a new mailbox. But sometimes even when closing an existing mailbox. Occasionally mutt will even crash (which is annoying, but certainly not a bug of dovecot). How do I debug this? -- Tzafrir Cohen | tzafrir(a)jbr.cohens.org.il | VIM is http://tzafrir.org.il | | a Mutt's tzafrir(a)cohens.org.il | | best ICQ# 16849755 | | friend

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[Dovecot] dovecot update ?
by Brent Clark 14 Aug '05

14 Aug '05

Hi list Im currently run debian sarge / testing. I upgraded my dovecot this morning on my mail server this morning, and my dovecot stopped working for my mail users email clients. I told debconf to replace the dovecot.conf (Baring in mind I saved my conf file). The output I was getting was as so: ====================================================================== Aug 11 10:09:56 mail dovecot: Dovecot v1.0-test70 starting up Aug 11 10:10:21 mail dovecot: auth(default): client in: AUTH^I1^IPLAIN^Iservice=IMAP^Ilip=192.168.111.11^Irip=192.168.111.225^Iresp=AGdjaXZvbG FuaQBwYXNzd29yZA== Aug 11 10:10:21 mail dovecot: auth(default): client out: OK^I1^Iuser=gcivolani Aug 11 10:10:21 mail dovecot: auth(default): master in: REQUEST^I1^I2040^I1 Aug 11 10:10:21 mail dovecot: auth(default): master out: USER^I1^Igcivolani^Isystem_user=gcivolani^Iuid=1009^Igid=1009^Ihome=/home/gcivolani Aug 11 10:10:21 mail dovecot: imap-login: Login: gcivolani [192.168.111.225] Aug 11 10:10:21 mail dovecot: IMAP(gcivolani): Effective uid=1009, gid=1009 Aug 11 10:10:21 mail dovecot: IMAP(gcivolani): Namespace: type=public, prefix=Public/, sep=/, inbox=no, hidden=no, subscriptions=no Aug 11 10:10:21 mail dovecot: IMAP(gcivolani): maildir autodetect: stat(/tmp/cur) failed: No such file or directory Aug 11 10:10:21 mail dovecot: IMAP(gcivolani): mbox autodetect: data=/tmp Aug 11 10:10:21 mail dovecot: IMAP(gcivolani): mbox autodetect: INBOX file: is a directory (/tmp) Aug 11 10:10:21 mail dovecot: IMAP(gcivolani): mbox autodetect: has .imap/: stat(/tmp/.imap) failed: No such file or directory Aug 11 10:10:21 mail dovecot: IMAP(gcivolani): mbox autodetect: has inbox: stat(/tmp/inbox) failed: No such file or directory Aug 11 10:10:21 mail dovecot: IMAP(gcivolani): mbox autodetect: has mbox: stat(/tmp/mbox) failed: No such file or directory Aug 11 10:10:21 mail dovecot: IMAP(gcivolani): Failed to create storage for 'Public/' with data: /tmp Aug 11 10:10:21 mail dovecot: child 2052 (imap) returned error 89 Aug 11 10:10:21 mail dovecot: auth(default): client in: AUTH^I1^IPLAIN^Iservice=IMAP^Ilip=192.168.111.11^Irip=192.168.111.225^Iresp=AGdjaXZvbG FuaQBwYXNzd29yZA== Aug 11 10:10:21 mail dovecot: auth(default): client out: OK^I1^Iuser=gcivolani ======================================================================== I killed dovecot and restarted it with my old conf fike (I have attached my conf file). I then proceed by uninstalling this version of dovecot and reinstalled the previous version (still using the old conf file) On doing so I, started getting this error message in my syslog: ======================================================================== Aug 11 12:24:46 mail dovecot: auth(default): client in: AUTH^I1^IPLAIN^Iservice=IMAP^Ilip=192.168.111.11^Irip=192.168.111.225^Iresp=AGdjaXZvbG FuaQBwYXNzd29yZA== Aug 11 12:24:46 mail dovecot: auth(default): client out: OK^I1^Iuser=gcivolani Aug 11 12:24:46 mail dovecot: auth(default): master in: REQUEST^I115^I4435^I1 Aug 11 12:24:46 mail dovecot: auth(default): master out: USER^I115^Igcivolani^Isystem_user=gcivolani^Iuid=1009^Igid=1009^Ihome=/home/gcivolani Aug 11 12:24:46 mail dovecot: IMAP(gcivolani): Effective uid=1009, gid=1009 Aug 11 12:24:46 mail dovecot: IMAP(gcivolani): maildir: data=/home/gcivolani/Maildir Aug 11 12:24:46 mail dovecot: IMAP(gcivolani): maildir: root=/home/gcivolani/Maildir, index=/home/gcivolani/Maildir, control=, inbox= Aug 11 12:24:46 mail dovecot: imap-login: Login: gcivolani [192.168.111.225] ======================================================================== Although dovecot's port was up and running, my users still could not read or see there folders. It was only once I realised that when I copied and renamed my .subscription file to subscription, did it all work. Obviously the mistake was on myside but telling debconf to over write the conf file, but I find it a bit weid that when on killing dovecot and then restarting the with the old conf file, it still did not work. To be honest, im a bit lost as to how im going to rectify this, but I know that I want to upgrade my packages. If you can help in anyway, it would be most appreciated. Kind Regards and thanks in advance. Brent Clark ## Dovecot 1.0 configuration file # '#' character and everything after it is treated as comments. Extra spaces # and tabs are ignored. If you want to use either of these explicitly, put the # value inside quotes, eg.: key = "# char and trailing whitespace " # Default values are shown after each value, it's not required to uncomment # any of the lines. Exception to this are paths, they're just examples # with real defaults being based on configure options. The paths listed here # are for configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var # --with-ssldir=/etc/ssl # Base directory where to store runtime data. base_dir = /var/run/dovecot/ # Protocols we want to be serving: # imap imaps pop3 pop3s protocols = imap imaps # IP or host address where to listen in for connections. It's not currently # possible to specify multiple addresses. "*" listens in all IPv4 interfaces. # "[::]" listens in all IPv6 interfaces, but may also listen in all IPv4 # interfaces depending on the operating system. If you want to specify ports # for each service, you will need to configure these settings inside the # protocol imap/pop3 { ... } section, so you can specify different ports # for IMAP/POP3. listen = * # IP or host address where to listen in for SSL connections. Defaults # to above if not specified. #ssl_listen = # Disable SSL/TLS support. #ssl_disable = no # PEM encoded X.509 SSL/TLS certificate and private key. They're opened before # dropping root privileges, so keep the key file unreadable by anyone but # root. Included doc/mkcert.sh can be used to easily generate self-signed # certificate, just make sure to update the domains in dovecot-openssl.cnf #ssl_cert_file = /etc/ssl/certs/dovecot.pem #ssl_key_file = /etc/ssl/private/dovecot.pem # File containing trusted SSL certificate authorities. Usually not needed. #ssl_ca_file = # Request client to send a certificate. #ssl_verify_client_cert = no # SSL parameter file. Master process generates this file for login processes. # It contains Diffie Hellman and RSA parameters. #ssl_parameters_file = /var/run/dovecot/ssl-parameters.dat # How often to regenerate the SSL parameters file. Generation is quite CPU # intensive operation. The value is in hours, 0 disables regeneration # entirely. #ssl_parameters_regenerate = 24 # SSL ciphers to use #ssl_cipher_list = all:!low # Disable LOGIN command and all other plaintext authentications unless # SSL/TLS is used (LOGINDISABLED capability). Note that 127.*.*.* and # IPv6 ::1 addresses are considered secure, this setting has no effect if # you connect from those addresses. disable_plaintext_auth = no # Use this logfile instead of syslog(). /dev/stderr can be used if you want to # use stderr for logging (ONLY /dev/stderr - otherwise it is closed). #log_path = # For informational messages, use this logfile instead of the default #info_log_path = # Prefix for each line written to log file. % codes are in strftime(3) # format. #log_timestamp = "%b %d %H:%M:%S " ## ## Login processes ## # Directory where authentication process places authentication UNIX sockets # which login needs to be able to connect to. The sockets are created when # running as root, so you don't have to worry about permissions. Note that # everything in this directory is deleted when Dovecot is started. #login_dir = /var/run/dovecot/login # chroot login process to the login_dir. Only reason not to do this is if you # wish to run the whole Dovecot without roots. # http://wiki.dovecot.org/Rootless #login_chroot = yes # User to use for the login process. Create a completely new user for this, # and don't use it anywhere else. The user must also belong to a group where # only it has access, it's used to control access for authentication process. # Note that this user is NOT used to access mails. # http://wiki.dovecot.org/UserIds #login_user = dovecot # Set max. process size in megabytes. If you don't use # login_process_per_connection you might need to grow this. #login_process_size = 32 # Should each login be processed in it's own process (yes), or should one # login process be allowed to process multiple connections (no)? Yes is more # secure, espcially with SSL/TLS enabled. No is faster since there's no need # to create processes all the time. #login_process_per_connection = yes # Number of login processes to create. If login_process_per_user is # yes, this is the number of extra processes waiting for users to log in. #login_processes_count = 3 # Maximum number of extra login processes to create. The extra process count # usually stays at login_processes_count, but when multiple users start logging # in at the same time more extra processes are created. To prevent fork-bombing # we check only once in a second if new processes should be created - if all # of them are used at the time, we double their amount until limit set by this # setting is reached. This setting is used only if login_process_per_use is yes. #login_max_processes_count = 128 # Maximum number of connections allowed in login state. When this limit is # reached, the oldest connections are dropped. If login_process_per_user # is no, this is a per-process value, so the absolute maximum number of users # logging in actually login_processes_count * max_logging_users. #login_max_logging_users = 256 # Greeting message for clients. login_greeting = Dovecot ready. ## ## Mail processes ## # Maximum number of running mail processes. When this limit is reached, # new users aren't allowed to log in. #max_mail_processes = 1024 # Show more verbose process titles (in ps). Currently shows user name and # IP address. Useful for seeing who are actually using the IMAP processes # (eg. shared mailboxes or if same uid is used for multiple accounts). verbose_proctitle = yes # Show protocol level SSL errors. #verbose_ssl = no # Valid UID range for users, defaults to 500 and above. This is mostly # to make sure that users can't log in as daemons or other system users. # Note that denying root logins is hardcoded to dovecot binary and can't # be done even if first_valid_uid is set to 0. #first_valid_uid = 500 #last_valid_uid = 0 # Valid GID range for users, defaults to non-root/wheel. Users having # non-valid GID as primary group ID aren't allowed to log in. If user # belongs to supplementary groups with non-valid GIDs, those groups are # not set. #first_valid_gid = 1 #last_valid_gid = 0 # Grant access to these extra groups for mail processes. Typical use would be # to give "mail" group write access to /var/mail to be able to create dotlocks. #mail_extra_groups = # ':' separated list of directories under which chrooting is allowed for mail # processes (ie. /var/mail will allow chrooting to /var/mail/foo/bar too). # This setting doesn't affect login_chroot or auth_chroot variables. # WARNING: Never add directories here which local users can modify, that # may lead to root exploit. Usually this should be done only if you don't # allow shell access for users. See doc/configuration.txt for more information. #valid_chroot_dirs = # Default chroot directory for mail processes. This can be overridden for # specific users in user database by giving /./ in user's home directory # (eg. /home/./user chroots into /home). Note that usually there is no real # need to do chrooting, Dovecot doesn't allow users to access files outside # their mail directory anyway. #mail_chroot = # Enable mail process debugging. This can help you figure out why Dovecot # isn't finding your mails. mail_debug = yes # Default MAIL environment to use when it's not set. By leaving this empty # dovecot tries to do some automatic detection as described in # doc/mail-storages.txt. There's a few special variables you can use, eg.: # # %u - username # %n - user part in user@domain, same as %u if there's no domain # %d - domain part in user@domain, empty if there's no domain # %h - home directory # # See doc/variables.txt for full list. Some examples: # # default_mail_env = maildir:/var/mail/%1u/%u/Maildir # default_mail_env = mbox:~/mail/:INBOX=/var/mail/%u # default_mail_env = mbox:/var/mail/%d/%n/:INDEX=/var/indexes/%d/%n # #default_mail_env = #default_mail_env = maildir: #default_mail_env = maildir:%h/Maildir default_mail_env = maildir:/home/%u/Maildir # If you need to set multiple mailbox locations or want to change default # namespace settings, you can do it by defining namespace sections: # # You can have private, shared and public namespaces. The only difference # between them is how Dovecot announces them to client via NAMESPACE # extension. Shared namespaces are meant for user-owned mailboxes which are # shared to other users, while public namespaces are for more globally # accessible mailboxes. # # REMEMBER: If you add any namespaces, the default namespace must be added # explicitly, ie. default_mail_env does nothing unless you have a namespace # without a location setting. Default namespace is simply done by having a # namespace with empty prefix. # default namespace #namespace private { # separator = / # prefix = # inbox = yes #} # for backwards compatibility: #namespace private { # separator = / # prefix = mail/ # hidden = yes #} #namespace private { # separator = / # prefix = ~/mail/ # hidden = yes #} #namespace private { # separator = / # prefix = ~%u/mail/ # hidden = yes #} #namespace public { # separator = / # prefix = Public/ # location = /tmp #} # Space-separated list of fields to initially save into cache file. Currently # these fields are allowed: # # flags, date.sent, date.received, size.virtual, size.physical # mime.parts, imap.body, imap.bodystructure # # Different IMAP clients work in different ways, so they benefit from # different cached fields. Some do not benefit from them at all. Caching more # than necessary generates useless disk I/O, so you don't want to do that # either. # # Dovecot attempts to automatically figure out what client wants and it keeps # only that. However the first few times a mailbox is opened, Dovecot hasn't # yet figured out what client needs, so it may not perform optimally. If you # know what fields the majority of your clients need, it may be useful to set # these fields by hand. If client doesn't actually use them, Dovecot will # eventually drop them. # # Usually you should just leave this field alone. The potential benefits are # typically unnoticeable. #mail_cache_fields = # Space-separated list of fields that Dovecot should never save to cache file. # Useful if you want to save disk space at the cost of more I/O when the fields # needed. #mail_never_cache_fields = # Like mailbox_check_interval, but used for IDLE command. #mailbox_idle_check_interval = 30 # Allow full filesystem access to clients. There's no access checks other than # what the operating system does for the active UID/GID. It works with both # maildir and mboxes, allowing you to prefix mailboxes names with eg. /path/ # or ~user/. #mail_full_filesystem_access = no # Maximum allowed length for mail keyword name. It's only forced when trying # to create new keywords. #mail_max_keyword_length = 50 # Save mails with CR+LF instead of plain LF. This makes sending those mails # take less CPU, especially with sendfile() syscall with Linux and FreeBSD. # But it also creates a bit more disk I/O which may just make it slower. #mail_save_crlf = no # Use mmap() instead of read() to read mail files. read() seems to be a bit # faster with my Linux/x86 and it's better with NFS, so that's the default. # Note that OpenBSD 3.3 and older don't work right with mail_read_mmaped = yes. #mail_read_mmaped = no # Don't use mmap() at all. This is required if you store indexes in remote # filesystems (NFS or clustered filesystem). #mmap_disable = no # Don't write() to mmaped files. This is required for some operating systems # which use separate caches for them, such as OpenBSD. #mmap_no_write = no # Locking method for index files. Alternatives are fcntl, flock and dotlock. # Dotlocking uses some tricks which may create more disk I/O than other locking # methods. #lock_method = fcntl # By default LIST command returns all entries in maildir beginning with dot. # Enabling this option makes Dovecot return only entries which are directories. # This is done by stat()ing each entry, so it causes more disk I/O. # (For systems setting struct dirent->d_type, this check is free and it's # done always regardless of this setting) #maildir_stat_dirs = no # Copy mail to another folders using hard links. This is much faster than # actually copying the file. This is problematic only if something modifies # the mail in one folder but doesn't want it modified in the others. I don't # know any MUA which would modify mail files directly. IMAP protocol also # requires that the mails don't change, so it would be problematic in any case. # If you care about performance, enable it. #maildir_copy_with_hardlinks = no # Which locking methods to use for locking mbox. There's four available: # dotlock: Create <mailbox>.lock file. This is the oldest and most NFS-safe # solution. If you want to use /var/mail/ like directory, the users # will need write access to that directory. # fcntl : Use this if possible. Works with NFS too if lockd is used. # flock : May not exist in all systems. Doesn't work with NFS. # lockf : May not exist in all systems. Doesn't work with NFS. # # You can use multiple locking methods; if you do the order they're declared # in is important to avoid deadlocks if other MTAs/MUAs are using multiple # locking methods as well. Some operating systems don't allow using some of # them simultaneously. #mbox_read_locks = fcntl #mbox_write_locks = dotlock fcntl # Maximum time in seconds to wait for lock (all of them) before aborting. #mbox_lock_timeout = 300 # If dotlock exists but the mailbox isn't modified in any way, override the # lock file after this many seconds. #mbox_dotlock_change_timeout = 30 # When mbox changes unexpectedly we have to fully read it to find out what # changed. If the mbox is large this can take a long time. Since the change # is usually just a newly appended mail, it'd be faster to simply read the # new mails. If this setting is enabled, Dovecot does this but still safely # fallbacks to re-reading the whole mbox file whenever something in mbox isn't # how it's expected to be. The only real downside to this setting is that if # some other MUA changes message flags, Dovecot doesn't notice it immediately. # Note that a full sync is done with SELECT, EXAMINE, EXPUNGE and CHECK # commands. #mbox_dirty_syncs = yes # Like mbox_dirty_syncs, but don't do full syncs even with SELECT, EXAMINE, # EXPUNGE or CHECK commands. If this is set, mbox_dirty_syncs is ignored. #mbox_very_dirty_syncs = no # Delay writing mbox headers until doing a full write sync (EXPUNGE and CHECK # commands and when closing the mailbox). This is especially useful for POP3 # where clients often delete all mails. The downside is that our changes # aren't immediately visible to other MUAs. #mbox_lazy_writes = yes # umask to use for mail files and directories #umask = 0077 # Drop all privileges before exec()ing the mail process. This is mostly # meant for debugging, otherwise you don't get core dumps. It could be a small # security risk if you use single UID for multiple users, as the users could # ptrace() each others processes then. #mail_drop_priv_before_exec = no # Set max. process size in megabytes. Most of the memory goes to mmap()ing # files, so it shouldn't harm much even if this limit is set pretty high. #mail_process_size = 256 # Log prefix for mail processes. See doc/variables.txt for list of possible # variables you can use. #mail_log_prefix = "%Us(%u): " ## ## IMAP specific settings ## protocol imap { # Login executable location. #login_executable = /usr/libexec/dovecot/imap-login # IMAP executable location #mail_executable = /usr/libexec/dovecot/imap # This would write rawlogs into ~/dovecot.rawlog/ directory: #mail_executable = /usr/libexec/dovecot/rawlog /usr/libexec/dovecot/imap # Maximum IMAP command line length in bytes. Some clients generate very long # command lines with huge mailboxes, so you may need to raise this if you get # "Too long argument" or "IMAP command line too large" errors often. #imap_max_line_length = 65536 # Support for dynamically loadable modules. #mail_use_modules = no #mail_modules = /usr/lib/dovecot/imap # Send IMAP capabilities in greeting message. This makes it unnecessary for # clients to request it with CAPABILITY command, so it saves one round-trip. # Many clients however don't understand it and ask the CAPABILITY anyway. #login_greeting_capability = no # Workarounds for various client bugs: # delay-newmail: # Send EXISTS/RECENT new mail notifications only when replying to NOOP # and CHECK commands. Some clients ignore them otherwise, for example # OSX Mail. Outlook Express breaks more badly though, without this it # may show user "Message no longer in server" errors. Note that OE6 still # breaks even with this workaround if synchronization is set to # "Headers Only". # outlook-idle: # Outlook and Outlook Express never abort IDLE command, so if no mail # arrives in half a hour, Dovecot closes the connection. This is still # fine, except Outlook doesn't connect back so you don't see if new mail # arrives. # netscape-eoh: # Netscape 4.x breaks if message headers don't end with the empty "end of # headers" line. Normally all messages have this, but setting this # workaround makes sure that Netscape never breaks by adding the line if # it doesn't exist. This is done only for FETCH BODY[HEADER.FIELDS..] # commands. Note that RFC says this shouldn't be done. #imap_client_workarounds = outlook-idle } ## ## POP3 specific settings ## protocol pop3 { # Login executable location. #login_executable = /usr/libexec/dovecot/pop3-login # POP3 executable location #mail_executable = /usr/libexec/dovecot/pop3 # Don't try to set mails non-recent or seen with POP3 sessions. This is # mostly intended to reduce disk I/O. With maildir it doesn't move files # from new/ to cur/, with mbox it doesn't write Status-header. #pop3_no_flag_updates = no # Support LAST command which exists in old POP3 specs, but has been removed # from new ones. Some clients still wish to use this though. Enabling this # makes RSET command clear all \Seen flags from messages. #pop3_enable_last = no # POP3 UIDL format to use. You can use following variables: # # %v - Mailbox UIDVALIDITY # %u - Mail UID # %m - MD5 sum of the mailbox headers in hex (mbox only) # %f - filename (maildir only) # # If you want UIDL compatibility with other POP3 servers, use: # UW's ipop3d : %08Xv%08Xu # Courier version 0 : %f # Courier version 1 : %u # Courier version 2 : %v-%u # Cyrus (<= 2.1.3) : %u # Cyrus (>= 2.1.4) : %v.%u # # Note that Outlook 2003 seems to have problems with %v.%u format which is # Dovecot's default, so if you're building a new server it would be a good # idea to change this. %08Xu%08Xv should be pretty fail-safe. #pop3_uidl_format = %v.%u # Support for dynamically loadable modules. #mail_use_modules = no #mail_modules = /usr/lib/dovecot/pop3 # Workarounds for various client bugs: # outlook-no-nuls: # Outlook and Outlook Express hang if mails contain NUL characters. # This setting replaces them with 0x80 character. # oe-ns-eoh: # Outlook Express and Netscape Mail breaks if end of headers-line is # missing. This option simply sends it if it's missing. #pop3_client_workarounds = } ## ## Authentication processes ## # Executable location #auth_executable = /usr/libexec/dovecot/dovecot-auth # Set max. process size in megabytes. #auth_process_size = 256 # Authentication cache size in kilobytes. #auth_cache_size = 0 # Time to live in seconds for cached data. After this many seconds a cached # record is forced out of cache. #auth_cache_ttl = 3600 # Space separated list of realms for SASL authentication mechanisms that need # them. You can leave it empty if you don't want to support multiple realms. # Many clients simply use the first one listed here, so keep the default realm # first. #auth_realms = # Default realm/domain to use if none was specified. This is used for both # SASL realms and appending @domain to username in plaintext logins. #auth_default_realm = # List of allowed characters in username. If the user-given username contains # a character not listed in here, the login automatically fails. This is just # an extra check to make sure user can't exploit any potential quote escaping # vulnerabilities with SQL/LDAP databases. If you want to allow all characters, # set this value to empty. #auth_username_chars = abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@ # Username character translations before it's looked up from databases. The # value contains series of from -> to characters. For example "#@/@" means # that '#' and '/' characters are translated to '@'. #auth_username_translation = # Username to use for users logging in with ANONYMOUS SASL mechanism #auth_anonymous_username = anonymous # More verbose logging. Useful for figuring out why authentication isn't # working. auth_verbose = yes # Even more verbose logging for debugging purposes. Shows for example SQL # queries. auth_debug = yes # Maximum number of dovecot-auth worker processes. They're used to execute # blocking passdb and userdb queries (eg. MySQL and PAM). They're # automatically created and destroyed as needed. #auth_worker_max_count = 30 auth default { # Space separated list of wanted authentication mechanisms: # plain digest-md5 cram-md5 apop anonymous mechanisms = plain # # Password database is used to verify user's password (and nothing more). # You can have multiple passdbs and userdbs. This is useful if you want to # allow both system users (/etc/passwd) and virtual users to login without # duplicating the system users into virtual database. # # http://wiki.dovecot.org/Authentication # # PAM authentication. Preferred nowadays by most systems. # Note that PAM can only be used to verify if user's password is correct, # so it can't be used as userdb. If you don't want to use a separate user # database (passwd usually), you can use static userdb. #passdb { # args=/etc/passwd #} passdb pam { } userdb passwd { } #passdb pam { # Service name or * as parameter. * means the authenticating service name # is used, eg. pop3 or imap. #args = dovecot #args= /etc/passwd #} # /etc/passwd or similar, using getpwnam() # In many systems nowadays this uses Name Service Switch, which is # configured in /etc/nsswitch.conf. # passdb passwd { # args= /etc/passwd # } # /etc/shadow or similiar, using getspnam(). Deprecated by PAM nowadays. # passdb shadow { # args= /etc/shadow # } # passwd-like file with specified location #passdb passwd-file { # Path for passwd-file #args = #} # checkpassword executable authentication #passdb checkpassword { # Path for checkpassword binary #args = #} # /etc/passwd or similar, using getpwnam() # In many systems nowadays this uses Name Service Switch, which is # configured in /etc/nsswitch.conf. userdb passwd { } # passwd-like file with specified location #userdb passwd-file { # Path for passwd-file #args = #} # static settings generated from template #userdb static { # Template for settings. Can return anything a userdb could normally # return, eg.: uid, gid, home, mail, nice # # A few examples: # # args = uid=500 gid=500 home=/var/mail/%u # args = uid=500 gid=500 home=/home/%u mail=mbox:%h/mail nice=10 # #args = #} # User to use for the process. This user needs access to only user and # password databases, nothing else. Only shadow and pam authentication # requires roots, so use something else if possible. Note that passwd # authentication with BSDs internally accesses shadow files, which also # requires roots. Note that this user is NOT used to access mails. # That user is specified by userdb above. user = root # Directory where to chroot the process. Most authentication backends don't # work if this is set, and there's no point chrooting if auth_user is root. # Note that valid_chroot_dirs isn't needed to use this setting. #chroot = # Number of authentication processes to create #count = 1 # Require a valid SSL client certificate or the authentication fails. #ssl_require_client_cert = no } # It's possible to export the authentication interface to other programs, # for example SMTP server which supports talking to Dovecot. Client socket # handles the actual authentication - you give it a username and password # and it returns OK or failure. So it's pretty safe to allow anyone access to # it. Master socket is used to a) query if given client was successfully # authenticated, b) userdb lookups. # listener sockets will be created by Dovecot's master process using the # settings given inside the auth section #auth default_with_listener { # mechanisms = plain # passdb passwd { # } # userdb pam { # } # socket listen { # master { # path = /var/run/dovecot/auth-master # #mode = 0600 # # Default user/group is the one who started dovecot-auth (root) # #user = # #group = # } # client { # path = /var/run/dovecot-auth-client # mode = 0660 # } # } #} # connect sockets are assumed to be already running, Dovecot's master # process only tries to connect to them. They don't need any other settings # than path for the master socket, as the configuration is done elsewhere. # Note that the client sockets must exist in login_dir. #auth external { # socket connect { # master { # path = /var/run/dovecot/auth-master # } # } #}

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[Dovecot] dovecot-auth: BUG: login gave a PID of existing connection
by m.durnthaler＠aon.at 14 Aug '05

14 Aug '05

hi, first of all i have to say that i´m new to dovecot and to mailinglist. i´m trying to setup my owen imap-server on fc3, but i have some trouble with dovecot. wenn i try to log in with telnet lovalhost 143 /var/log/maillog says: dovecot-auth: BUG: login gave a PID of existing connection. can someone please give me an hint or a link to solve this problem. yours, martin. ------------------------------------------- Versendet durch aonWebmail (webmail.aon.at)

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