May 2020 - dovecot - dovecot.org

Avoiding logging password when dict lookup fails
by Geo Mander 26 May '20

26 May '20

I've made a unix-socket auth setup, by looking at the examples here: https://doc.dovecot.org/configuration_manual/authentication/dict/#complete-… I need to ship the plain password to the socket as well, so i have simply added %w to the lookup key, like so: key = passdb/U=%u P=%w My problem is, that if the socket connection is down for whatever reason, dovecot will write the entire message above - including the plaintext password - into the logfile. --- May 25 11:17:48 imap-1 dovecot: auth-worker(32690): Error: dict-client: Lookup 'shared/passdb/U=john.doe(a)example.com P=john123 failed: net_connect_unix(/var/run/dovecot/doveauthdsocket) failed: Connection refused (reply took 0.000 secs (0.000 in dict wait, 0.000 in other ioloops, 0.000 in locks)) May 25 11:17:48 imap-1 dovecot: auth-worker(32690): Error: dict( john.doe(a)example.com,8.8.4.4,<Px/Ic3WmsNhb7s1N>): Failed to lookup key shared/passdb/U=john.doe(a)example.com P=john123 -- Can i disable dict client logging? Or can i structure my dict request in a different way to avoid this logging, while still getting the complete user-name and plaintext password shipped over the socket? $ dovecot --version 2.2.36 (1f10bfa63)

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child killed by signal 6
by Peter Nabbefeld 26 May '20

26 May '20

Hello, from time to time I keep getting problems with some emails causing signal 6. I've already reported those, but it seems not to be easy to find the cause. From the logs, it seems to occur in sieve implementation. I've checked the email envelopes tody by accident, probably this part of my telnet session might help: a11 fetch 1 all * 1 FETCH (RFC822.SIZE 16750 INTERNALDATE "22-May-2020 05:02:34 +0000" ENVELOPE ("Fri, 22 May 2020 03:46:54 +0000" "RE: Http2 tomact server taking time in responding when 1st StreamId is a large integer value like 2147483641" (("Prateek Kohli" NIL "prateek.kohli" "ericsson.com.INVALID")) (("Prateek Kohli" NIL "prateek.kohli" "ericsson.com.INVALID")) (("Tomcat Users List" NIL "users" "tomcat.apache.org")) (("Tomcat Users List" NIL "users" "tomcat.apache.org")) NIL NIL "<d778507f-306b-5395-b583-fc1f2651431d(a)apache.org>" " <DB7PR07MB40285E61F0731810A615E3FB92B40(a)DB7PR07MB4028.eurprd07.prod.outlook.com>") FLAGS (\Seen)) a11 OK FETCH completed a12 fetch 2 all * 2 FETCH (RFC822.SIZE 21146 INTERNALDATE "22-May-2020 06:39:54 +0000" ENVELOPE ("Fri, 22 May 2020 06:39:35 +0000" "RE: RST on TCP level sent by Tomcat" (("Arshiya Shariff" NIL "arshiya.shariff" "ericsson.com.INVALID")) (("Arshiya Shariff" NIL "arshiya.shariff" "ericsson.com.INVALID")) (("Tomcat Users List" NIL "users" "tomcat.apache.org")) (("Tomcat Users List" NIL "users" "tomcat.apache.org")) (("markt(a)apache.org" NIL "markt" "apache.org")("M Venkata Pratap M" NIL "m.m.venkata.pratap" "ericsson.com")) NIL " <AM7PR07MB6561761FA78F23F5AAF398399FB70(a)AM7PR07MB6561.eurprd07.prod.outlook.com>" " <AM7PR07MB65615CD03F422AC8D8384FC09FB40(a)AM7PR07MB6561.eurprd07.prod.outlook.com>") FLAGS ()) a12 OK FETCH completed The first message causes signal 6, the second does not. Probably the problem is killed by the two consecutive "NIL"s? I'm not an experienced administrator, only managing my private computer, so I don't know the meaning of every envelope field. But might these two "NIL"s cause the abort? BTW, to download all messages from my IMAP account to my private dovecot instance I had to delete the first message, since I couldn't download any other messages from the IMAP folder otherwise. Kind regards Peter

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Sieve test string and case sensitivity
by Kim Minh Kaplan 25 May '20

25 May '20

Hello, I have found that Pigeonhole comes with an extensive testsuite against the Sieve RFCs. As I am working on a personal Sieve project I decided to run my tool on this testsuite and it stumbled on "Basic assignment: string test failed"[1]. Pigeonhole defaults to comparator "i;octet"[2] for the string test. But Sieve says that the default comparator should be "i;ascii-casemap"[3]. Did I miss some other part of the standard? Can you point me in the right direction? Thank you, Kim Minh. [1]: https://github.com/dovecot/pigeonhole/blob/master/tests/extensions/variable… [2]: https://github.com/dovecot/pigeonhole/blob/master/src/lib-sieve/plugins/var… [3]: https://tools.ietf.org/html/rfc5228#section-2.7.3

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Sieve addheader directive works only partially
by Peter Folta 25 May '20

25 May '20

Hi all, I want to add a custom header to incoming emails from a particular sender. This is what my user Sieve script looks like: require “editheader”; if address :is "From” “special-sender(a)example.xn--com-9o0a { addheader “X-My-Custom-Header” “Header Value"; } I have enabled the editheader extension in my Dovecot configuration: plugin { … sieve_extensions = +editheader } This doesn’t seem to work and no header is added to the email. However, if I also move the email to a different folder in the same if-block, the header gets added just fine: require “editheader”; require “fileinto”; if address :is "From” “special-sender(a)example.xn--com-9o0a { addheader “X-My-Custom-Header” “Header Value”; fileinto “MyFolder”; } Am I missing something? Thanks Peter

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missing man page for “doveadm dsync-server”?
by Felipe Gasper 25 May '20

25 May '20

Hello, Is there a man page for this command? I don’t see one in the repository. Given its utility in, e.g., syncing mailboxes via SSH, it seems like documentation for this command would be useful? Thank you! -Felipe Gasper

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doveadm backup : Error: Failed to access mailbox
by Laura Smith 25 May '20

25 May '20

Hi All, So close and yet so far. ;-( Have been migrating users from an old Dovecot server to a new one. All of the users have doveadm backup'd perfectly, except for one ! What does the below mean ? $ sudo doveadm -v -o imapc_user=jd(a)example.org.tld -o imapc_password=secretSquirrel -o imapc_host=old-server.example.com backup -1 -R -u jd(a)example.org.tld imapc: dsync(jd(a)example.org.tld): Info: imapc(old-server.example.com:993): Connected to 10.10.10.10:993 (local 10.10.10.11:35858) dsync(jd(a)example.org.tld): Error: Failed to access mailbox Sent Messages (jasmin@example: Mailbox doesn't exist: Sent Messages (jasmin@example (0.001 + 0.000 secs). dsync(jd(a)example.org.tld): Error: Failed to access mailbox Sent Messages (jasmin(a)example.org: Mailbox doesn't exist: Sent Messages (jasmin(a)example.org (0.001 + 0.000 secs). dsync(jd(a)example.org.tld): Error: Failed to access mailbox Drafts (jasmin@example: Mailbox doesn't exist: Drafts (jasmin@example (0.001 + 0.000 secs). dsync(jd(a)example.org.tld): Error: Failed to access mailbox Drafts (jasmin(a)example.org: Mailbox doesn't exist: Drafts (jasmin(a)example.org (0.001 + 0.000 secs). dsync(jd(a)example.org.tld): Error: Failed to access mailbox Deleted Messages (jasmin@example: Mailbox doesn't exist: Deleted Messages (jasmin@example (0.001 + 0.000 secs). dsync(jd(a)example.org.tld): Error: Failed to access mailbox Deleted Messages (jasmin(a)example.org: Mailbox doesn't exist: Deleted Messages (jasmin(a)example.org (0.001 + 0.000 secs).

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A small mistake in a Dovecot error message.
by Bill Shirley 24 May '20

24 May '20

I'm setting up a new mail server and got this message: May 21 11:55:09 vader dovecot[4090]: imap-login: Error: Diffie-Hellman key exchange requested, but no DH parameters provided. Set ssh_dh=</path/to/dh.pem The Dovecot parameter is actually: ss*l*_dh<=/path/to/dh.pem not ssh... Fedora release 32 (Thirty Two) dovecot-2.3.9.3-1.fc32.x86_64 Many thanks for such useful software. Bill

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Dovecot passdb and postfix login
by Laura Smith 24 May '20

24 May '20

Hi, Long story short I've got a fully functional Dovecot IMAP instance and I am now looking to upgrade some perimiter authenticated SMTP relays to authenticate against the Dovecot instance. Trouble is that I am seeing errors such as "auth: Warning: sql: Ignoring changed user_query in /etc/dovecot/local_sql_users.conf, because userdb sql not used." in my Postfix server logs and not able to successfully authenticate via AUTH LOGIN on the Postfi instance. Perhaps I'm missing something obvious from my config ? Here is the doveconf -n from the Postfix server in question: # 2.3.10.1 (a3d0e1171): /etc/dovecot/dovecot.conf # OS: Linux 4.19.0-9-amd64 x86_64 Debian 10.4 # Hostname: foobar.example.com auth_mechanisms = plain login auth_verbose = yes auth_verbose_passwords = sha1:7 disable_plaintext_auth = no mail_location = mbox:~/mail:INBOX=/var/mail/%u namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = } passdb { args = /etc/dovecot/local_sql_users.conf driver = sql } service auth { inet_listener { address = 127.0.0.1 port = 7425 } inet_listener { address = ::1 port = 7425 } unix_listener /var/spool/postfix-authrelay/private/dovecot-auth { group = postfix mode = 0660 user = postfix } } ssl = no The local_sql_users.conf is the same one that's used on the functioning IMAP servers, just copied accross to the authenticated relay server: $ sudo cat /etc/dovecot/local_sql_users.conf driver = pgsql connect = host=foo dbname=bar user=secret password=squirrel default_pass_scheme = ARGON2ID password_query = select dovecot_username as user,password from get_user('%u') user_query = select 'vmail' as uid, 'vmail' as gid iterate_query = select dovecot_username as user from get_users()

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Re: fail2ban setup centos 7 not picking auth fail?
by Voytek Eymont 23 May '20

23 May '20

On Fri, May 22, 2020 2:05 pm, Adi Pircalabu wrote: > On 22-05-2020 10:38, Voytek Eymont wrote: > > Hardly a Dovecot issue. Can you please post the output of this command? > /usr/bin/fail2ban-regex /var/log/dovecot.log > /etc/fail2ban/filter.d/dovecot.conf Adi, thanks, what I get is: # /usr/bin/fail2ban-regex /var/log/dovecot.log /etc/fail2ban/filter.d/dovecot.conf Running tests ============= Use failregex filter file : dovecot, basedir: /etc/fail2ban Use datepattern : Default Detectors Use log file : /var/log/dovecot.log Use encoding : UTF-8 Results ======= Failregex: 5149 total |- #) [# of hits] regular expression | 2) [5149] ^(?:\[\])?\s*(?:<[^.]+\.[^.]+>\s+)?(?:\S+\s+)?(?:kernel:\s?\[ *\d+\.\d+\]:?\s+)?(?:@vserver_\S+\s+)?(?:(?:(?:\[\d+\])?:\s+[\[$]?\S*(?:\(\S+$)?[\]\)]?:?|[\[$]?\S*(?:\(\S+$)?[\]\)]?:?(?:\[\d+\])?:?)\s+)?(?:\[ID \d+ \S+\]\s+)?(?:pop3|imap)-login: (?:Info: )?(?:Aborted login|Disconnected)(?::(?: [^ $]+)+)? \((?:auth failed, \d+ attempts( in \d+ secs)?|tried to use (disabled|disallowed) \S+ auth)$:( user=<[^>]+>,)?( method=\S+,)? rip=<HOST>(?:, lip=\S+)?(?:, TLS(?: handshaking(?:: SSL_accept failed: error:[\dA-F]+:SSL routines:[TLS\d]+_GET_CLIENT_HELLO:unknown protocol)?)?(: Disconnected)?)?(, session=<\S+>)?\s*$ `- Ignoreregex: 0 total Date template hits: |- [# of hits] date format | [338975] {^LN-BEG}(?:DAY )?MON Day %k:Minute:Second(?:\.Microseconds)?(?: ExYear)? `- Lines: 338975 lines, 0 ignored, 5149 matched, 333826 missed [processed in 87.44 sec] Missed line(s): too many to print. Use --print-all-missed to print all 333826 lines

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Sieve regexp matches wrong
by kverizhnikov 23 May '20

23 May '20

Hello! Recently I've faced with strange issue. So, I want to filter some mails which do not contain cyrillic symbols. I would not like receive email on foreign language except russian and I'm using rule below, but it does not work when text of mail has unicode symbol u2019 or ’ - right single quotation mark. |require ["body","regex"];| |# rule:[Regexp test]| |if not body :text :regex ".*[аАбБвВгГдДеЕёЁжЖзЗиИйЙкКлЛмМнНоОпПрРсСтТуУфФхХцЦчЧшШщЩъЪыЫьЬэЭюЮяЯ].*"| |{| | discard;| | stop;| |}| I checked this behavior on different versions of dovecot and pigeonhole, and it was the same in all cases. If I change u2019 to, for instance to apostrophe, it begins work as I expect - the mail discarded. Below some information which was got from sieve-test utility. The text consist of only one phrase *Test’test*. Check string *Test’test *- without u2019, using apostrophe root@a4e4b17d33a1:/srv/mail# tail -2 1586937347.M574837P24389.vps.kveri.ru\,S\=1904\,W\=1944\:2\,S Test'test sieve-test output * Script metadata (block: 0): class = file class.version = 0 location = /srv/mail/roundcube.sieve * Required extensions (block: 1): 0: body (id: 18) 1: regex (id: 13) * Main program (block: 2): Address Line Code 00000000: DEBUG BLOCK: 3 00000001: EXTENSIONS [2]: 00000002: body 00000004: regex 00000006: 3: BODY 00000007: BODY-TRANSFORM: TEXT 0000000b: match type: regex 0000000d: key list: STR[138] ".*[аАбБвВгГдДеЕёЁжЖзЗиИйЙкКлЛмМнНоОпПрРс... 0000009b: 3: JMPTRUE 6 [000000a2] 000000a0: 5: DISCARD 000000a1: 6: STOP 000000a2: 6: [End of code] Performed actions: * discard Implicit keep: (none) In this case the rule works as I expect The second test *Test’test* with ’ instead of apostrophe root@a4e4b17d33a1:/srv/mail# tail -2 1586937347.M574837P24389.vps.kveri.ru\,S\=1904\,W\=1944\:2\,S Test’test sieve-test output * Script metadata (block: 0): class = file class.version = 0 location = /srv/mail/roundcube.sieve * Required extensions (block: 1): 0: body (id: 18) 1: regex (id: 13) * Main program (block: 2): Address Line Code 00000000: DEBUG BLOCK: 3 00000001: EXTENSIONS [2]: 00000002: body 00000004: regex 00000006: 3: BODY 00000007: BODY-TRANSFORM: TEXT 0000000b: match type: regex 0000000d: key list: STR[138] ".*[аАбБвВгГдДеЕёЁжЖзЗиИйЙкКлЛмМнНоОпПрРс... 0000009b: 3: JMPTRUE 6 [000000a2] 000000a0: 5: DISCARD 000000a1: 6: STOP 000000a2: 6: [End of code] Performed actions: (none) Implicit keep: * store message in folder: INBOX In this case email "was located" into INBOX, but I expected it should be discarded. As I said this behavior does not depend on dovecot and pigeonhole version - I've tried dovecot 2.3.7, 2.2.30.x, 2.3.9.3 and 2.3.10, pigeonhole 0.5.7.2, 0.5.9 and 0.5.10, fresh install and working in docker container. The dovecot-sysreport was taken from the last one. What am I doing wrong? Is it pigeonhole bug or smth like that?

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