January 2025 - dovecot

SCRAM-SHA -PLUS variants and Dovecot (Channel Binding)
by * Neustradamus * 03 Jan '25

03 Jan '25

Dear all, In first, I wish you a Happy New Year 2025! In the past, I have requested SCRAM support in Dovecot, etc. I would like to know the situation with -PLUS variants (Channel Binding)? This feature for more security is always missing. RFC 9266: Channel Bindings for TLS 1.3: - https://datatracker.ietf.org/doc/html/rfc9266 Little details, to know easily: - tls-unique for TLS =< 1.2 - tls-server-end-point - tls-exporter for TLS = 1.3 Can you add tls-unique, tls-server-end-point and tls-exporter to be perfect? Stephan Bosch has started but no news since one year: - https://github.com/dovecot/core/compare/main...stephanbosch:dovecot-core:sa… Other links: SASL2 I-D: Extensible Simple Authentication and Security Layer (SASL): - https://datatracker.ietf.org/doc/html/draft-melnikov-sasl2 It is in several XEPs too: - XEP-0388: Extensible SASL Profile: https://xmpp.org/extensions/xep-0388.html - XEP-0440: SASL Channel-Binding Type Capability: https://xmpp.org/extensions/xep-0440.html - XEP-0474: SASL SCRAM Downgrade Protection: https://xmpp.org/extensions/xep-0474.html - XEP-0480: SASL Upgrade Tasks: https://xmpp.org/extensions/xep-0480.html Thanks in advance. Regards, Neustradamus

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Possible SSL Related Issue
by bcs＠nanomail.net 02 Jan '25

02 Jan '25

Need some help in resolving the issue described below and would greatly appreciate any assistance. Please let me know if any additional information is required. Thank you. Updated Postfix with signed certificates from self signed and am experiencing several new log entries that I am unable to identify. See history that follows. * Self signed certificate in Postfix with pop3. Has worked this way since original install. Dec 29 00:12:41 mail dovecot: pop3-login: Login: user=<usr1>, method=PLAIN, rip=209.197.77.67, lip=10.0.1.211, mpid=15448, TLS, session=<CuXLvmEqzM/RxU1D> Dec 29 00:12:41 mail dovecot: pop3(usr1): Disconnected: Logged out top=0/0, retr=0/0, del=0/2825, size=204691614 * Updated log entry for signed certificate in Postfix. Original self signed certificate still used in Dovecot. Note new disconnect record with information such as <136791><t3CWAKwqpieu9RkM> before the Disconnected message. Unable to find anything about these codes. Jan 1 16:48:12 mail dovecot: pop3-login: Login: user=<usr1>, method=PLAIN, rip=174.245.25.12, lip=10.0.1.211, mpid=136791, TLS, session=<t3CWAKwqpieu9RkM> Jan 1 16:48:13 mail dovecot: pop3(usr1)<136791><t3CWAKwqpieu9RkM>: Disconnected: Logged out top=0/0, retr=0/0, del=0/2867, size=206803370 * Self signed certificate in Postfix with imap. Dec 29 00:06:30 mail dovecot: imap-login: Login: user=<usr2>, method=PLAIN, rip=10.0.1.101, lip=10.0.1.211, mpid=15104, TLS, session=<bZezqGEqBMMKAAFl> Dec 29 00:06:31 mail dovecot: imap(usr2): Connection closed (SELECT finished 0.177 secs ago) in=102 out=952 * Updated non self signed certificate in Postfix. Original self signed certificate still used in Dovecot. Similar information before Disconnect message. Jan 1 16:55:00 mail dovecot: imap-login: Login: user=<usr2>, method=PLAIN, rip=10.0.1.4, lip=10.0.1.211, mpid=136855, TLS, session=<Z/7hGKwqntEKAAEE> Jan 1 16:55:00 mail dovecot: imap(usr2)<136855><Z/7hGKwqntEKAAEE>: Connection closed (SELECT finished 0.117 secs ago) in=106 out=1012 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0 Issue persists and appears worse when attempting to access the mail server with the Rainloop web application. Rainloop log messages before signed certificate update appeared as the following: Dec 29 07:09:17 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=20215, TLS, session=<xTGtkGcqKNgKAAHT> Dec 29 07:09:17 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=20216, TLS, session=<azKtkGcqMtgKAAHT> Dec 29 07:09:17 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=20217, TLS, session=<Qz2tkGcqOtgKAAHT> Dec 29 07:09:17 mail dovecot: imap(usr): Logged out in=211 out=2047 Dec 29 07:09:17 mail dovecot: imap(usr): Logged out in=28 out=787 Dec 29 07:09:17 mail dovecot: imap(usr): Logged out in=80 out=1449 Dec 29 07:09:17 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=20218, TLS, session=<0EetkGcqRNgKAAHT> Dec 29 07:09:17 mail dovecot: imap(usr): Logged out in=350 out=1381 Dec 29 07:09:17 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=20220, TLS, session=<U8+vkGcqVNgKAAHT> Dec 29 07:09:17 mail dovecot: imap(usr): Logged out in=713 out=66680 Dec 29 07:09:24 mail dovecot: imap(usr): Connection closed (SELECT finished 0.176 secs ago) in=110 out=970 But now contain the same type of <141032><n0r2ZbAqLLMKAAHT> entries before Logged out and seems to be completing significantly more logins and logouts. Note the web interface is working. Jan 1 22:02:53 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141032, TLS, session=<n0r2ZbAqLLMKAAHT> Jan 1 22:02:53 mail dovecot: imap(usr)<141032><n0r2ZbAqLLMKAAHT>: Logged out in=11 out=457 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0 Jan 1 22:02:53 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141034, TLS, session=<4OP7ZbAqOLMKAAHT> Jan 1 22:02:53 mail dovecot: imap(usr)<141034><4OP7ZbAqOLMKAAHT>: Logged out in=80 out=1470 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0 Jan 1 22:02:54 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141038, TLS, session=<Grz9ZbAqSLMKAAHT> Jan 1 22:02:54 mail dovecot: imap(usr)<141038><Grz9ZbAqSLMKAAHT>: Logged out in=342 out=1473 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0 Jan 1 22:02:54 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141039, TLS, session=<+Mf9ZbAqVLMKAAHT> Jan 1 22:02:54 mail dovecot: imap(usr)<141039><+Mf9ZbAqVLMKAAHT>: Logged out in=693 out=37481 deleted=0 expunged=0 trashed=0 hdr_count=20 hdr_bytes=20978 body_count=0 body_bytes=0 Jan 1 22:02:59 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141041, TLS, session=<MxRKZrAq6IcKAAHT> Jan 1 22:02:59 mail dovecot: imap(usr)<141041><MxRKZrAq6IcKAAHT>: Logged out in=28 out=881 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0 Jan 1 22:03:07 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141043, TLS, session=<SsLKZrAq7ocKAAHT> Jan 1 22:03:07 mail dovecot: imap(usr)<141043><SsLKZrAq7ocKAAHT>: Logged out in=525 out=10554 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=3522 body_count=1 body_bytes=4807 Jan 1 22:03:08 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141045, TLS, session=<b2/bZrAq/IcKAAHT> Jan 1 22:03:08 mail dovecot: imap(usr)<141045><b2/bZrAq/IcKAAHT>: Logged out in=523 out=15895 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=947 body_count=1 body_bytes=13215 Jan 1 22:03:09 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141047, TLS, session=<P3XrZrAqsJYKAAHT> Jan 1 22:03:09 mail dovecot: imap(usr)<141047><P3XrZrAqsJYKAAHT>: Logged out in=523 out=8719 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=779 body_count=1 body_bytes=6300 Jan 1 22:03:10 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141049, TLS, session=<JmD7ZrAqwJYKAAHT> Jan 1 22:03:10 mail dovecot: imap(usr)<141049><JmD7ZrAqwJYKAAHT>: Logged out in=523 out=13125 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=780 body_count=1 body_bytes=10700 Jan 1 22:03:11 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141051, TLS, session=<kkoLZ7Aq0JYKAAHT> Jan 1 22:03:11 mail dovecot: imap(usr)<141051><kkoLZ7Aq0JYKAAHT>: Logged out in=523 out=8022 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=800 body_count=1 body_bytes=5582 Jan 1 22:03:12 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141055, TLS, session=<7ywbZ7Aq4JYKAAHT> Jan 1 22:03:12 mail dovecot: imap(usr)<141055><7ywbZ7Aq4JYKAAHT>: Logged out in=523 out=13955 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=1113 body_count=1 body_bytes=11104 Jan 1 22:03:13 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141057, TLS, session=<JAMrZ7Aq6JYKAAHT> Jan 1 22:03:13 mail dovecot: imap(usr)<141057><JAMrZ7Aq6JYKAAHT>: Logged out in=523 out=14232 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=774 body_count=1 body_bytes=11814 Jan 1 22:03:14 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141059, TLS, session=<lvE6Z7Aq9JYKAAHT> Jan 1 22:03:14 mail dovecot: imap(usr)<141059><lvE6Z7Aq9JYKAAHT>: Logged out in=523 out=6987 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=749 body_count=1 body_bytes=4599 Jan 1 22:03:15 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141061, TLS, session=<6NdKZ7AqBJcKAAHT> Jan 1 22:03:15 mail dovecot: imap(usr)<141061><6NdKZ7AqBJcKAAHT>: Logged out in=523 out=7126 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=812 body_count=1 body_bytes=4676 Jan 1 22:03:16 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141063, TLS, session=<ebpaZ7AqCJcKAAHT> Jan 1 22:03:16 mail dovecot: imap(usr)<141063><ebpaZ7AqCJcKAAHT>: Logged out in=523 out=26116 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=861 body_count=1 body_bytes=23498 Jan 1 22:03:17 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141065, TLS, session=<2aRqZ7AqDJcKAAHT> Jan 1 22:03:17 mail dovecot: imap(usr)<141065><2aRqZ7AqDJcKAAHT>: Logged out in=523 out=8776 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=775 body_count=1 body_bytes=6374 Jan 1 22:03:18 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141067, TLS, session=<b4d6Z7AqAOIKAAHT> Jan 1 22:03:18 mail dovecot: imap(usr)<141067><b4d6Z7AqAOIKAAHT>: Logged out in=523 out=9875 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=749 body_count=1 body_bytes=7498 Jan 1 22:03:20 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141069, TLS, session=<a3GKZ7AqCuIKAAHT> Jan 1 22:03:20 mail dovecot: imap(usr)<141069><a3GKZ7AqCuIKAAHT>: Logged out in=523 out=61311 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=1153 body_count=1 body_bytes=58591 Jan 1 22:03:21 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141071, TLS, session=<AHuaZ7AqDuIKAAHT> Jan 1 22:03:21 mail dovecot: imap(usr)<141071><AHuaZ7AqDuIKAAHT>: Logged out in=523 out=9458 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=1150 body_count=1 body_bytes=6745 Jan 1 22:03:22 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141073, TLS, session=<X2WqZ7AqGuIKAAHT> Jan 1 22:03:22 mail dovecot: imap(usr)<141073><X2WqZ7AqGuIKAAHT>: Logged out in=523 out=11885 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=772 body_count=1 body_bytes=9482 Jan 1 22:03:23 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141075, TLS, session=<eEu6Z7AqKOIKAAHT> Jan 1 22:03:23 mail dovecot: imap(usr)<141075><eEu6Z7AqKOIKAAHT>: Logged out in=523 out=8665 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=777 body_count=1 body_bytes=6326 Jan 1 22:03:24 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141077, TLS, session=</i3KZ7AqOOIKAAHT> Jan 1 22:03:24 mail dovecot: imap(usr)<141077></i3KZ7AqOOIKAAHT>: Logged out in=523 out=42692 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=778 body_count=1 body_bytes=40360 Jan 1 22:03:25 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141079, TLS, session=<NCDaZ7AqOuIKAAHT> Jan 1 22:03:25 mail dovecot: imap(usr)<141079><NCDaZ7AqOuIKAAHT>: Logged out in=523 out=19469 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=1641 body_count=1 body_bytes=16070 Jan 1 22:03:26 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141081, TLS, session=<QAfqZ7AqPuIKAAHT> Jan 1 22:03:26 mail dovecot: imap(usr)<141081><QAfqZ7AqPuIKAAHT>: Logged out in=523 out=9596 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=858 body_count=1 body_bytes=7098 Jan 1 22:03:29 mail dovecot: imap-login: Login: user=<usr>, method=PLAIN, rip=10.0.1.211, lip=10.0.1.211, mpid=141083, TLS, session=<AgEYaLAqgLUKAAHT> Jan 1 22:03:29 mail dovecot: imap(usr)<141083><AgEYaLAqgLUKAAHT>: Logged out in=523 out=11342 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=1188 body_count=1 body_bytes=8581 Jan 1 22:10:40 mail dovecot: imap(usr)<141310><rUXLgbAqGq8KAAE8>: Connection closed (SELECT finished 0.074 secs ago) in=101 out=966 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0

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Hard-coded upper limit for sieve_max_redirects ?
by Maciej Polewczynski 02 Jan '25

02 Jan '25

Hello, After upgrading Dovecot from version 2.3.4 to 2.3.19 i noticed errors for some users having sieve redirects. Before upgrade all worked fine. In sieve plugin i have two limits: sieve_max_actions = 500 sieve_max_redirects = 150 If user have up to 100 redirects all works fine but if there are 101 or more none of them works and there is error: dovecot: lmtp(test2.mbox) Error: sieve: msgid=<***l>: redirect action: failed to check for duplicate forward to <101th.email.address> It seams that there is another limit but cant find where. When checked "dovecot -n|grep 100" there was only "default_process_limit". Increasing this changed nothing. Still the same error. File ".dovecot.sieve.log" in user home dir don't have any additional information. There is only: redirect action: failed to check for duplicate forward: internal error occurred: refer to server log for more information. Do you have any ideas how to fix it? -- Best regards, Maciej Polewczyński Do or do not. There is no try.

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