July 2023 - dovecot - dovecot.org

user lookup fails username is SHA256 @domain
by Daniel Botting 16 Jul '23

16 Jul '23

Hi all, I'm currently building a replacement personal mailserver on Debian 11 (hopefully upgrade it to 12 and it will continue to work). My existing personal mailserver is serving a handful of mailboxes for three domains, virtual users, on an older version of Debian. When I attempt to deliver mail to the server (using swaks) it is accepted by Exim and passed to lda, as per the logs below the lda is somehow seeing the CRYPT entry as if it was the local part? Output from syslog: Jul 16 09:50:02 imap2 dovecot: lda({SHA256-CRYPT}generated-sha(a)example.domain)<700316><>: Debug: auth-master: userdb lookup({SHA256-CRYPT}generated-sha(a)example.domain): Started userdb lookup Jul 16 09:50:02 imap2 dovecot: lda({SHA256-CRYPT}generated-sha(a)example.domain)<700316><>: Debug: auth-master: conn unix:/run/dovecot/auth-userdb: Connecting Jul 16 09:50:02 imap2 dovecot: lda({SHA256-CRYPT}generated-sha(a)example.domain)<700316><>: Debug: auth-master: conn unix:/run/dovecot/auth-userdb (pid=700293,uid=0): Client connected (fd=9) Jul 16 09:50:02 imap2 dovecot: auth: Debug: master in: USER#0111#011{SHA256-CRYPT}generated-sha(a)example.domain#011service=lda Jul 16 09:50:02 imap2 dovecot: auth: Username character disallowed by auth_username_chars: 0x7b (username: {SHA256-CRYPT}generated-sha(a)example.domain) Jul 16 09:50:02 imap2 dovecot: auth: Debug: userdb out: NOTFOUND#0111 Jul 16 09:50:02 imap2 dovecot: lda({SHA256-CRYPT}generated-sha(a)example.domain)<700316><>: Debug: auth-master: userdb lookup({SHA256-CRYPT}generated-sha(a)example.domain): auth USER input: Jul 16 09:50:02 imap2 dovecot: lda({SHA256-CRYPT}generated-sha(a)example.domain)<700316><>: Debug: auth-master: userdb lookup({SHA256-CRYPT}generated-sha(a)example.domain): Userdb lookup failed Jul 16 09:50:02 imap2 dovecot: lda(700316): Debug: auth-master: conn unix:/run/dovecot/auth-userdb (pid=700293,uid=0): Disconnected: Connection closed (fd=9) From what I've read 0x7b is hex for { so disallowed by auth_username_chars line is because of this problem. Doveconf -n output: # 2.3.20 (80a5ac675d): /etc/dovecot/dovecot.conf # OS: Linux 5.10.0-21-amd64 x86_64 Debian 11.6 # Hostname: mailserver.fqdn auth_debug = yes auth_debug_passwords = yes auth_verbose = yes mail_debug = yes mail_location = maildir:~/Maildir 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/vmail/%d/passwd driver = passwd-file } protocols = " imap" service auth { unix_listener auth-client { group = Debian-exim mode = 0660 } } service stats { unix_listener stats-reader { group = vmail mode = 0660 user = vmail } unix_listener stats-writer { group = vmail mode = 0660 user = vmail } } ssl = required ssl_cert = </path/to/cert.pem ssl_client_ca_dir = /etc/ssl/certs ssl_key = # hidden, use -P to show it userdb { args = uid=vmail gid=vmail home=/var/local/vmail/%d/%u driver = static } Example of line in passwd file: username:{SHA256-CRYPT}generated-sha I followed https://doc.dovecot.org/configuration_manual/howto/simple_virtual_install/ before posting to ensure I hadn't missed something obvious. Any thoughts on this would be appreciated. Thanks Daniel

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Windows 11 Outlook 365 and dovecot
by The Doctor 16 Jul '23

16 Jul '23

Are there any known Idssues? I help set up a client this morning using Win11 and Dovecot and the client cannot delete e-mail like he did previously. -- Member - Liberal International This is doctor(a)nk.ca Ici doctor(a)nk.ca Yahweh, King & country!Never Satan President Republic!Beware AntiChrist rising! Look at Psalms 14 and 53 on Atheism https://www.empire.kred/ROOTNK?t=94a1f39b We look outside to find assurance, and then we fail. -unknown Beware https://mindspring.com

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Options to track performance?
by Christian 15 Jul '23

15 Jul '23

Hi there, after upgrading my dovecot on a bookworm container, I now have a weird delay when imap clients like Evolution connect the first time. Is there any performance logging configuration I could enable, to see what dovecot is doing in which timing? I suspect some timeout or delay somewhere, but unable to find it so far. Kind regards Chris

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Options to track performance?
by Christian 15 Jul '23

15 Jul '23

Hi there, after upgrading my dovecot on a bookworm container, I now have a weird delay when imap clients like Evolution connect the first time. Is there any performance logging configuration I could enable, to see what dovecot is doing in which timing? I suspect some timeout or delay somewhere, but unable to find it so far. Kind regards Chris

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dovecot and argonid
by Maciej Milaszewski 13 Jul '23

13 Jul '23

Hi For test I try use new auth (argonid) fot dovecot-2.3.20 I change only in sql: password: {ARGON2ID}........ in dovecot.conf i set default_vsz_limit = 2000 M and I can't auth Jul 12 15:07:43 dovecot8 dovecot: auth-worker(44928): conn unix:auth-worker (pid=23437,uid=114): auth-worker<4772376>: sql(user12,xxx.xxx.xxx.12,<VfN04EkA0LUK>): Password mismatch Jul 12 15:07:43 dovecot8 dovecot: imap-login: Disconnected: Connection closed (auth failed, 1 attempts in 105 secs): user=<user12>, method=PLAIN, rip=xxx.xxx.xxx.12, lip=xxx.xxx.xxx.12, secured, session=<VfN04EkA0LUK> I try telnet ip 144 a login username pass Any idea ?

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Proper way to enable statistics on Dovecot 2.3.20?
by rixati6186＠iturchia.com 12 Jul '23

12 Jul '23

Hi. I'm using Dovecot on OpenBSD OS. "dovecot --version" reports: 2.3.20 (80a5ac675d) and this is my configuration file: https://termbin.com/m4to How to properly set the statistics for the version I use? I have both "service stats" and "service old-stats" and it seems I'm not really getting any statistics. Where's my mistake? Thanks in advance. ("doveadm oldstats top" command gives an empty page with columns.) Thanks.

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argon2id best practices, generating and database storage
by David Mehler 12 Jul '23

12 Jul '23

Hello, To users of argon2id as a password hash, what are best practices/what do you use to generate the argon2id password hashes? I want to know if I should do more than: doveadm pw -s ARGON2ID Also, for storing an argon2id password hash in a database (mysql/mariadb in this example) what value(s) do you use for the field? Thanks. Dave.

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Motion for OCSP Support in Dovecot
by novoMedia 12 Jul '23

12 Jul '23

Currently, Dovecot does not offer any support for OCSP, leaving system administrators with a dilemma: choosing between security or compatibility. - What is OCSP? OCSP (Online Certificate Status Protocol) is a network protocol used to check the validity and revocation status of digital certificates in real-time. - What is Must-Staple? "Must-Staple" is a certificate extension that enforces the inclusion of OCSP stapling information, requiring servers to present the certificate's revocation status during the TLS handshake. - What advantages does the use of Must-Staple offer? The inclusion of a 'must-staple' flag in a certificate mandates the presence of an OCSP response during a TLS handshake, ensuring that a revoked certificate remains (at worst) only usable until the expiration of the latest OCSP response, rather than the expiration of the certificate itself (subject to specific client/implementation). https://www.reddit.com/r/selfhosted/comments/aye79v/the_case_for_ocsp_musts… - What is the current issue with Dovecot? Presently, any system administrator who intends to issue must-staple certificates, faces the dilemma to either chose to a) Refrain from issuing must-staple certificates at all, resulting in the loss of a valuable security feature. b) Issue must-staple certificates without an OCSP response in Dovecot, thereby breaking the TLS RFC (and “hope for the best” on the client side…). A "stuck between a rock and a hard place" situation. - Any other reasons to implement OCSP? Regulatory frameworks such as HIPAA, PCI-DSS and more require the implementation of OCSP to enhance privacy and security. Personally, this requirement does not impact me since I am neither located in the United States nor have customers there. Nonetheless, it is worth noting this requirement for individuals or entities who are subject to these regulations. - Is there demand for OCSP in Dovecot? https://github.com/mjhas/dovecot/issues/44 (First GitHub Google hit for “dovecot ocsp”) https://serverfault.com/questions/830434/do-postfix-and-dovecot-support-ocs… https://dovecot.org/pipermail/dovecot/2018-October/113368.html https://www.dovecot.org/list/dovecot/2016-March/103395.html - Summary By implementing a simple OCSP solution, Dovecot could effectively solve this predicament without any drawbacks for its users. The focus here is on simplicity. It is unnecessary to employ a comprehensive OCSP resolver/responder like the one used in Nginx; rather, it would suffice to allow the definition of a simple file path containing the OCSP response alongside the certificate (honoring TLS SNI). Please kindly consider my motion.

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mail-crypt key sharing
by Robert Senger 12 Jul '23

12 Jul '23

Hi all, I am trying to setup mailbox sharing (not public mailboxes) together with mail-crypt plugin and encrypted folder keys. According to the source code of the mail-crypt plugin (there's code trying to retrieve private keys for shared mailboxes), and its documentation, this should be possible: ----- If you are using global keys, mails can be shared within the key scope. The global key can be provided with several different scopes: Global scope: key is configured in dovecot.conf file Per-user(group) scope: key is configured in userdb file With folder keys, key sharing can be done to single user, or multiple users. When key is shared to single user, and the user has public key available, the folder key is encrypted to recipient’s public key. If you have mail_crypt_acl_require_secure_key_sharing enabled, you can’t share the key to groups or someone with no public key. ----- The documentation mentions key sharing, but I have no idea how this could be implemented, and did not find anything else than this mail- crypt documentation in the whole web... I assume that I need to export the user key of the users's folder that should be shared, and import it into the receiving users keys, encrypted with the receiving user's key. Is that right? Any hints how to do that? Regards, Robert -- Robert Senger

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Shared folders?
by joe a 11 Jul '23

11 Jul '23

Is it possible to setup shared folders between virtual users on the same server?

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