April 2013 - dovecot - dovecot.org

[Dovecot] CATENATE allows zero parts
by Mike Abbott 02 May '13

02 May '13

I'm pleased to see that dovecot-2.2 includes support for RFCs 4467 and 4469 (URLAUTH and CATENATE). I have begun testing these features (in dovecot-2.2.1) and comparing their functionality against Apple's implementation. So far I have discovered a few inconsistencies. I will report each of these, and any more that I may find, in separate threads. The first issue is that using CATENATE with no message parts works but, IMO, shouldn't: a2 append inbox catenate () a2 OK [APPENDUID 1366726248 9] Append completed. For comparison this is how Apple's enhanced dovecot in OS X Server handles this request: a2 append inbox catenate () a2 BAD Invalid arguments. According to RFC 4469 section 3 CATENATE requires "one or more message parts." This is formalized in section 5: append-data =/ "CATENATE" SP "(" cat-part *(SP cat-part) ")" and in RFC 3501 section 9 which states that "[ABNF] rules MUST be followed strictly." I believe that permitting zero cat-parts is contrary to the RFC, although I can understand permitting it under the general doctrine of "servers should be liberal in what they accept, and clients strict in what they send." Is accepting zero cat-parts an intentional exception to the RFC or an oversight?

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[Dovecot] CATENATE doesn't support literal+ url
by Mike Abbott 02 May '13

02 May '13

Dovecot-2.2.1 does not appear to support URLs specified via non-synchronizing literals (RFC 2088 LITERAL+), and also does not read and discard the literal+ input after reporting the error. This results in the literal+ input being interpreted as IMAP commands, which could alter the user's mail store in unexpected ways and/or lead to the abrupt disconnection of the client for exceeding the maximum number of bad IMAP commands. Example using dovecot-2.2.1 (note that the text nonsync literal includes the invisible CRLFs: "foobarCRLFbarbazCRLF"): a3 append inbox catenate (url {9+} /some-url text {16+} foobar barbaz ) a4 noop a3 BAD Error in IMAP command APPEND: Invalid arguments. foobar BAD Error in IMAP command : Unknown command. barbaz BAD Error in IMAP command : Unknown command. ) BAD Error in IMAP command : Unknown command. a4 OK NOOP completed. Example using Apple's enhanced dovecot in OS X Server: a3 append inbox catenate (url {9+} /some-url text {16+} foobar barbaz ) a4 noop a3 NO [BADURL /some-url] missing or invalid uid a4 OK NOOP completed. I believe the RFCs indicate that nonsync literal URLs should be permitted. RFC 4469 section 5: append-data =/ "CATENATE" SP "(" cat-part *(SP cat-part) ")" cat-part = text-literal / url url = "URL" SP astring RFC 3501 section 9: astring = 1*ASTRING-CHAR / string string = quoted / literal RFC 2088 section 4: literal ::= "{" number ["+"] "}" CRLF *CHAR8

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[Dovecot] Dovecot vs MBox
by Gregory Sloop 02 May '13

02 May '13

I'm still in the "what's wrong" stage of figuring out what's going on. But I've got a mail user who isn't getting new messages. Postfix accepts it and drops it in the users mbox. [This is verified. If I tail the Mbox, I can see the new messages.] "Mail" will see the messages too. But dovecot doesn't seem to know they exist. I don't think the MBox is corrupt, as I've tossed the first few messages in hopes that it would then read the rest, but no luck. Any ideas where to look next, what I might do to force dovecot to forget message ID's etc - that might force it to read the whole mailbox file again? [Or a pointer as to where it might be most productive to poke next?] TIA -Greg -- Gregory Sloop, Principal: Sloop Network & Computer Consulting 503.251.0452 x121 Voice | 503.251.0452 Fax www.sloop.net mailto:gregs@sloop.net

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[Dovecot] CATENATE allows empty messages
by Mike Abbott 02 May '13

02 May '13

Dovecot-2.2.1 allows empty messages to be APPENDed when using CATENATE: b1 append inbox catenate (text {0+} ) b1 OK [APPENDUID 1366726248 12] Append completed. Contrast this with regular APPEND: b2 append inbox {0+} b2 NO Can't save a zero byte message. Note that zero-size literals are OK but zero-size messages are not. So while "b1" above should fail like "b2", this should continue to succeed: b3 append inbox catenate (text {0+} text {8+} foobar ) b3 OK [APPENDUID 1366726248 13] Append completed.

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[Dovecot] Slow DNS warnings (proxy/auth)
by Christian Balzer 02 May '13

02 May '13

Hello, I've just finished transiting our proxies from perdition to dovecot (2.1.7-7 Debian). Yesterday 12 messages (all within the same second) like this caught my attention: --- Apr 25 17:19:09 pp11 dovecot: auth: Warning: proxy(redacted(a)gol.com,xx.xx.xx.xx,<26hUEivbfQBlMrMS>): DNS lookup for mb04.dentaku.gol.com took 5.002 s --- Now this machine at that time was handling a load of about 2 logins per second, about 20% of what it previously handled with perdition w/o a hiccup. It also runs a local caching nameserver and the A record for the mailbox server in question was most definitely cached at the time (verified via TTL). The machine in question was very bored and certainly capable of handling hundreds if not thousands of DNS queries per second at that moment. In short, I can't see any reason how the lookup could have taken so long, so my guess is there are some issues with the dns-helper (locking, stepping on each others feet, not being spawned fast enough) causing this. Some general remarks, dovecot as proxy feels "heavier" than perdition. In the CPU area that's probably a more subjective impression, because all the little helper processes make it clear what's going on where. Though the "config" process being rather active is something that perdition definitely doesn't do, it reads the config once at start time and that's it. All the IPC and central processes of course also make dovecot rather file handle hungry. Memory wise it's about 35% bigger than perdition and that's not subjective at all. ^o^ About one MB per proxy process/connection for dovecot in my case. Caveat emptor. ^o^ Regards, Christian -- Christian Balzer Network/Systems Engineer chibi(a)gol.com Global OnLine Japan/Fusion Communications http://www.gol.com/

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[Dovecot] NTLM authentication with Outlook 2010
by Kevin Bridges 01 May '13

01 May '13

All, I have a Ubuntu 12.04.2 box running Dovecot 2.0.19. I have it configured for our active directory. WBinfo and ntlm_auth work great. I am trying to get sso to work with ntlm. Gssapi with thunderbird works like it should. I just cant get ntlm with outlook 2010 to work for sso. I get prompted for my password each time I open outlook. I have attached my config for dovecot. Any help would be much appreciated. # 2.0.19: /etc/dovecot/dovecot.conf # OS: Linux 3.2.0-39-virtual x86_64 Ubuntu 12.04.2 LTS auth_debug = yes auth_debug_passwords = yes auth_mechanisms = gssapi ntlm auth_use_winbind = yes auth_verbose = yes auth_verbose_passwords = plain debug_log_path = /var/log/dovecot_debug.log log_path = /var/log/dovecot.log mail_location = mdbox:~/mdbox passdb { driver = pam } plugin { quota_rule = *:storage=2G quota_warning = storage=95%% quota-warning 95 %u } protocols = " imap" service auth-worker { user = root } service auth { user = root } ssl_cert = </etc/ssl/certs/dovecot.pem ssl_key = </etc/ssl/private/dovecot.pem userdb { driver = passwd } protocol imap { mail_plugins = " quota imap_quota" }

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[Dovecot] Antispam r49 breaks Dovecot v2.1
by Steffen Kaiser 30 Apr '13

30 Apr '13

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Dear Eugene, patch 49 breaks compilation with Dovecot v2.1. Attached patch encloses the change in a #if. To feed the #if the actual Dovecot version, I've introduced an extra variable in extra.mk, but I cannot help with making the GNU configure stuff doing it right away. There will be numerous other ways to get the Dovecot version into the source ... . Maybe, Timo would add a binary version of the Dovecot version in its config.h ? In order to be able to built version-aware plugins. Regards, - -- Steffen Kaiser -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQEVAwUBUNLvT2oxLS8a3A9mAQIzfwgAvf7zcN9RwKD/kTmFkfx5djKd5H0dRXt8 423csD3bCU6qcOtR2MHR0ApNp07aXK84MPgIazbne41Iekqk0daoOhnPoc0mHy8u kj9EYFGVlQTKa2vcSUEu8Phddc/YHvzQba9m2Dg9P4STuJ6EcRqkhvufspERGphF Y+IY20BQc9/Flu8TIxtt6pSiIioq0WWntCGnyPP9BX90JYYO+5zAm5FnG4GH4Q0Z 44dZSKM7iP0/nMhmsraX/5alxy0mvx3ZfhO/Ktx/wd92WmLROAlicBClIZC9XCH2 6HD/ryr73DrEeEZdmwHcnmZrtWc++EJcAetfv45Fov8XagUtFJ0D4A== =G+d/ -----END PGP SIGNATURE-----

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[Dovecot] Dovecot has no understandable configuration any more
by forum 30 Apr '13

30 Apr '13

Hello, my last problem could be solved now with userdb { driver = static args = uid=mail gid=mail home=/srv/mail/%d/%n } I can connect to dovecot locally with an webmailer. But there is no listener process to be seen outside of the server? Locally this ports are working, but not outside: # netstat -tulpn | grep dove tcp6 0 0 :::110 :::* LISTEN 5741/dovecot tcp6 0 0 :::143 :::* LISTEN 5741/dovecot tcp6 0 0 :::993 :::* LISTEN 5741/dovecot tcp6 0 0 :::995 :::* LISTEN 5741/dovecot Is this a configuration problem inside dovecot? Another problem is the migration from the existant emails from V1 to V2: In the log i can find: Apr 30 11:14:57 imap(xxxx@yyyy): Error: Broken file /srv/mail/yyyy/xxxx/.INBOX.dir.09/dovecot-uidlist line 1: Broken header (uidvalidity = 0, next_uid=697) How can i recover this? Delete all the index files? Has someone an idea how to migrate the emails from charset ISO8859-1 to UTF-8? Best regards Karsten

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[Dovecot] Dovecot Antispam Plugin is not working
by Ravi Kanchan 30 Apr '13

30 Apr '13

Hi All, I am using dovecot version 2.0.9 DSPAM Anti-Spam Suite 3.10.2 (agent/library) ClamAV 0.97.7/17102 and dspam antispam plugin dovecot-antispam-plugin-43880985e3dd and plugin configuration is given below: protocol imap { mail_plugins = " antispam autocreate" } protocol pop3 { mail_plugins = antispam autocreate } plugin { antispam_allow_append_to_spam = YES antispam_backend = dspam antispam_crm_args = --config=/home/vmail antispam_dspam_args = --client;--user vmail antispam_dspam_binary = /usr/bin/dspam antispam_dspam_notspam = --class=innocent antispam_dspam_result_header = X-DSPAM-Result antispam_dspam_spam = --class=spam antispam_mail_tmpdir = /tmp antispam_signature = X-DSPAM-Signature antispam_signature_missing = error antispam_spam = Spam } dspam bin path: [root@sogo ~]# which dspam /usr/bin/dspam and dspam.conf has attached with this mail. but my dspam plugin configuration is not working. and also I am not getting any log from dspam. My dspam server is working prefect. but I guess plugin is not working properly can anyone helpme. and my configuration for this is following:Regard's Ravi Kanchan Sharma Sr. System Administrator Infinite Computer Solutions (I) Ltd. Bglr. Mo. 9997154666

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[Dovecot] help with LMTP setup
by jeep＠rahul.net 30 Apr '13

30 Apr '13

Im trying to convert my dovecot-lda setup to use LMTP for better security. My setup is postfix + dovecot + mysql with virtual users. Im setting up dovecot 2.2.1 w/postfix 2.10.0 Im still learning dovecot so Im not totally sure where Im going wrong. Can someone point out why Im getting permission problems? Im also concerned with server security, so if you notice anything that should be better, please point that out. I am the only user on this Linux box. Thank you! ls -l /opt/imapdata/j/jeff/INBOX total 8 drwxr-xr-x 2 vmail vmail 4096 Apr 27 14:21 ./ drwxr-xr-x 3 vmail vmail 4096 Apr 27 14:21 ../ Dovecot is running with the following users: root 20847 0.0 0.0 15572 1108 ? Ss 10:23 0:00 /opt/optdovecot/sbin/dovecot dovenull 20848 0.0 0.0 46752 2724 ? S 10:23 0:00 dovecot/imap-login dovenull 20849 0.0 0.0 46752 2720 ? S 10:23 0:00 dovecot/imap-login vmail 20850 0.0 0.0 13408 1068 ? S 10:23 0:00 dovecot/anvil root 20851 0.0 0.0 13540 1192 ? S 10:23 0:00 dovecot/log root 20853 0.0 0.0 16504 2128 ? S 10:23 0:00 dovecot/config vmail 20854 0.0 0.0 136448 2972 ? S 10:23 0:00 dovecot/auth Im getting the following when an email comes in: Apr 29 10:11:57 fed8 postfix/virtual[20666]: D88F3DF3BD: to=<jeff(a)mydomain.com>, relay=virtual, delay=370, delays=370/0.03/0/0.07, dsn=4.2.0, status=deferred (delivery failed to mailbox ///opt/imapdata/j/jeff/INBOX/inbox: unable to create lock file ///opt/imapdata/j/jeff/INBOX/inbox.lock: Permission denied) my postfix/master.cf entry: dovecot unix - n n - - pipe flags=DRhu user=vmail:vmail argv=/opt/dovecot/libexec/dovecot/lmtp -f ${sender} -d ${recipient} doveconf -n: # 2.2.1: /opt/dovecot221/etc/dovecot/dovecot.conf # OS: Linux 3.8.5-201.fc18.x86_64 x86_64 Fedora release 18 (Spherical Cow) auth_debug = yes auth_debug_passwords = yes auth_verbose = yes auth_verbose_passwords = plain default_internal_user = vmail first_valid_gid = 2000 first_valid_uid = 2000 listen = * lock_method = flock login_log_format_elements = user=<%u> method=%m rip=%r lip=%l mpid=%e %c mail_debug = yes mail_gid = vmail mail_privileged_group = vmail mail_uid = vmail mbox_lock_timeout = 1 mins mbox_write_locks = fcntl passdb { args = /opt/dovecot/etc/dovecot/conf.d/dovecot-sql.conf.ext driver = sql } plugin { mail_log_events = delete undelete expunge copy mailbox_delete mailbox_rename mail_log_fields = uid box msgid size } postmaster_address = jeff(a)otherdomain.com protocols = imap lmtp sendmail_path = /usr/lib/sendmail service auth { inet_listener { port = 12345 } unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } unix_listener auth-userdb { mode = 0660 user = vmail } user = $default_internal_user } service imap-login { inet_listener imaps { port = 993 ssl = yes } process_min_avail = 2 service_count = 1 vsz_limit = 64 M } service lmtp { executable = lmtp -L inet_listener lmtp { address = 192.168.1.22 127.0.0.1 port = 24 } unix_listener lmtp { mode = 0666 } user = vmail } ssl = required ssl_cert = </opt/dovecot/etc/dovecot/conf.d/ssl/certs/dovecot.pem ssl_cipher_list = ALL:!LOW:!MEDIUM:!SSLv1:!SSLv2:!MD5:!SSL1:!SSL2:!EXP-ADH-DES-CBC-SHA:!EXP-EDH-RSA-DES-CBC-SHA:!EXP-DES-CBC-SHA:!EXP-EDH-RSA-DES-CBC-SHA:!EXP-ADH-DES-CBC-SHA:!EXP-DES-CBC-SHA:!ADH-AES256-SHA:!ADH-AES128-SHA:!ADH-DES-CBC3-SHA:!EXP-ADH-DES-CBC-SHA:!EXP-ADH-DES-CBC-SHA:!ADH-DES-CBC3-SHA:TLSv1 ssl_key = </opt/dovecot/etc/dovecot/conf.d/ssl/private/dovecot.pem userdb { args = uid=vmail gid=vmail home=/opt/imapdata/%1n/%n driver = static } userdb { args = /opt/dovecot/etc/dovecot/conf.d/dovecot-sql.conf.ext driver = sql } userdb { args = /opt/dovecot/etc/dovecot/conf.d/dovecot-sql.conf.ext driver = sql } verbose_ssl = yes protocol lmtp { info_log_path = /var/log/dovelmtp.log mail_plugins = " sieve" } protocol lda { info_log_path = /var/log/doveinfo.log log_path = /var/log/dovelda.log } protocol imap { imap_idle_notify_interval = 1 mins imap_max_line_length = 64 k mail_max_userip_connections = 5 } /mf/home/jeep/shell/.signature

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