June 2025 - dovecot - dovecot.org

[Dovecot] auth: Error: net_connect_unix(anvil-auth-penalty) failed: Permission denied
by mailing＠securitylabs.it 14 Sep '25

14 Sep '25

Hello, just upgraded one of my testing machine from dovecot 1.2.15 to 2.0.7. After some trouble with permissions now all seems working, but when I stop dovecot I have these errors in log: Nov 9 17:08:07 in dovecot: master: Warning: Killed with signal 15 (by pid=20362 uid=0 code=kill) Nov 9 17:08:07 in dovecot: pop3-login: Error: read(anvil) failed: EOF Nov 9 17:08:07 in dovecot: imap-login: Error: read(anvil) failed: EOF Nov 9 17:08:07 in dovecot: imap(mailing(a)securitylabs.it): Server shutting down. bytes=410/59361 Nov 9 17:08:07 in dovecot: imap(mailing(a)securitylabs.it): Server shutting down. bytes=79/26605 Nov 9 17:08:07 in dovecot: imap(mailing(a)securitylabs.it): Server shutting down. bytes=802/55708 Nov 9 17:08:07 in dovecot: imap(mailing(a)securitylabs.it): Server shutting down. bytes=258/1242 Nov 9 17:08:07 in dovecot: auth: Error: read(anvil-auth-penalty) failed: EOF Nov 9 17:08:07 in dovecot: auth: Error: net_connect_unix(anvil-auth-penalty) failed: Permission denied dovecot -n: # 2.0.7: /usr/local/etc/dovecot/dovecot.conf # OS: Linux 2.6.32-5-xen-686 i686 Debian squeeze/sid auth_cache_negative_ttl = 2 mins auth_cache_size = 1000 M auth_cache_ttl = 2 mins auth_master_user_separator = * auth_username_chars = abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@& disable_plaintext_auth = no dotlock_use_excl = yes first_valid_uid = 100 last_valid_uid = 105 lock_method = dotlock log_timestamp = "%Y-%m-%d %H:%M:%S " login_greeting = Server ready. mail_fsync = never mail_gid = Debian-exim mail_location = maildir:~/Maildir:INDEX=/var/indexes/%d/%n mail_privileged_group = Debian-exim mail_uid = Debian-exim managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date namespace { inbox = yes location = prefix = separator = / type = private } namespace { location = maildir:~/Maildir/expunged prefix = EXPUNGED/ separator = / type = private } namespace { location = maildir:~/Maildir/deleted prefix = DELETED/ separator = / type = private } namespace { location = maildir:~/Maildir/deleted/expunged prefix = DELETED/EXPUNGED/ separator = / type = private } passdb { args = /usr/local/etc/dovecot-sql.conf driver = sql } passdb { args = /usr/local/etc/passwd.masterusers driver = passwd-file master = yes pass = yes } plugin { lazy_expunge = EXPUNGED/ DELETED/ DELETED/EXPUNGED/ mail_log_events = delete expunge mail_log_group_events = quota = maildir quota_warning = storage=80%% /usr/local/bin/dovecot-quota-warning.sh 80 quota_warning2 = storage=90%% /usr/local/bin/dovecot-quota-warning.sh 90 sieve = ~/.dovecot.sieve } pop3_no_flag_updates = yes protocols = imap pop3 service auth { unix_listener auth-userdb { group = Debian-exim mode = 0600 user = Debian-exim } } service imap-login { client_limit = 256 process_limit = 128 process_min_avail = 3 service_count = 1 } service imap { drop_priv_before_exec = yes process_limit = 256 vsz_limit = 256 B } service pop3-login { client_limit = 256 process_limit = 128 process_min_avail = 3 service_count = 1 } service pop3 { drop_priv_before_exec = yes process_limit = 256 vsz_limit = 256 B } ssl_cert = </usr/local/etc/dovecot.crt ssl_key = </usr/local/etc/dovecot.key userdb { args = /usr/local/etc/dovecot-sql.conf driver = sql } protocol imap { mail_max_userip_connections = 10 mail_plugins = " notify quota imap_quota mail_log lazy_expunge" } protocol pop3 { mail_max_userip_connections = 3 mail_plugins = " notify quota mail_log" pop3_uidl_format = %08Xu%08Xv } protocol lda { mail_plugins = quota sieve postmaster_address = postmaster(a)securitylabs.it } My /usr/local/var/run/dovecot directory: 4 drwxr-sr-x 4 root staff 4096 Nov 9 17:08 . 4 drwxrwsrwx 3 root staff 4096 Nov 9 17:05 .. 0 srw------- 1 root staff 0 Nov 9 17:05 anvil 0 srw------- 1 root staff 0 Nov 9 17:05 anvil-auth-penalty 0 srw------- 1 root staff 0 Nov 9 17:05 auth-client 0 srw------- 1 dovecot staff 0 Nov 9 17:05 auth-login 0 srw------- 1 root staff 0 Nov 9 17:05 auth-master 0 srw------- 1 Debian-exim Debian-exim 0 Nov 9 17:05 auth-userdb 0 srw------- 1 dovecot staff 0 Nov 9 17:05 auth-worker 0 srw------- 1 root staff 0 Nov 9 17:05 config 0 srw------- 1 root staff 0 Nov 9 17:05 dict 0 srw------- 1 root staff 0 Nov 9 17:05 director-admin 0 srw-rw-rw- 1 root staff 0 Nov 9 17:05 dns-client 0 srw------- 1 root staff 0 Nov 9 17:05 doveadm-server 0 lrwxrwxrwx 1 root staff 35 Nov 9 17:05 dovecot.conf -> /usr/local/etc/dovecot/dovecot.conf 4 drwxr-xr-x 2 root root 4096 Nov 9 17:05 empty 4 drwxr-x--- 2 root dovenull 4096 Nov 9 17:05 login My emails are delivered as user Debian-exim and users are virtual in a MySQL DB. This system is behind a proxy (so the master user)

4 3

Crash in dovecot snippet when using imapc
by John van der Kamp 03 Sep '25

03 Sep '25

Hello, I've found a crash in a very specific setup. A dovecot server with imapc connection needs to receive an email with no body contents for the intent of generating a preview/snippet. It crashes somewhere deep in the jungle of istream and snapshots. I've included a script which sets up the systems to reproduce the crash. I've tested this with several versions. 2.3.16 doesn't seem to be affected, but 2.3.20 and 2.3.21 are affect. For me it produces a traceback like this, using the ubuntu version from here: https://packages.ubuntu.com/noble/dovecot-core (gdb) bt #0 __pthread_kill_implementation (no_tid=0, signo=6, threadid=140530132887360) at ./nptl/pthread_kill.c:44 #1 __pthread_kill_internal (signo=6, threadid=140530132887360) at ./nptl/pthread_kill.c:78 #2 __GI___pthread_kill (threadid=140530132887360, signo=signo@entry=6) at ./nptl/pthread_kill.c:89 #3 0x00007fcfb8842476 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26 #4 0x00007fcfb88287f3 in __GI_abort () at ./stdlib/abort.c:79 #5 0x00007fcfb8b37fe5 in default_fatal_finish (status=0, type=LOG_TYPE_PANIC) at ../lib/failures.c:465 #6 fatal_handler_real (ctx=<optimized out>, format=<optimized out>, args=<optimized out>) at ../lib/failures.c:477 #7 0x00007fcfb8be50d7 in i_internal_fatal_handler (ctx=<optimized out>, format=<optimized out>, args=<optimized out>) at ../lib/failures.c:879 #8 0x00007fcfb8b37eea in i_panic (format=0x7fcfb8c29020 "file %s: line %d (%s): assertion failed: (%s)") at ../lib/failures.c:530 #9 0x00007fcfb8b3387b in i_stream_header_filter_snapshot_free (_snapshot=<optimized out>) at ../lib-mail/istream-header-filter.c:663 #10 i_stream_header_filter_snapshot_free (_snapshot=0x55dabe297a60) at ../lib-mail/istream-header-filter.c:655 #11 0x00007fcfb8bf25ac in i_stream_snapshot_free (_snapshot=_snapshot@entry=0x55dabe29b0d0) at ../lib/istream.c:253 #12 0x00007fcfb8bf2654 in i_stream_unref (stream=0x7ffc16cc7fa0) at ../lib/istream.c:66 #13 0x00007fcfb8d96baa in index_mail_write_body_snippet (mail=0x55dabe292058) at index/index-mail.c:1151 #14 0x00007fcfb8d97e48 in index_mail_parse_bodystructure (mail=0x55dabe292058, field=MAIL_CACHE_BODY_SNIPPET) at index/index-mail.c:1551 #15 0x00007fcfb8d97fe2 in index_mail_fetch_body_snippet (value_r=0x7ffc16cc8050, mail=0x55dabe292058) at index/index-mail.c:1602 #16 index_mail_get_special (_mail=0x55dabe292058, field=<optimized out>, value_r=0x7ffc16cc8050) at index/index-mail.c:1730 #17 0x00007fcfb8d16ffe in mail_get_special (mail=mail@entry=0x55dabe292058, field=field@entry=MAIL_FETCH_BODY_SNIPPET, value_r=value_r@entry=0x7ffc16cc8050) at /home/ubuntu/dovecot/new/dovecot-2.3.21+dfsg1/src/lib-storage/mail.c:418 #18 0x000055dabc52645c in fetch_snippet (ctx=0x55dabe26e050, mail=0x55dabe292058, preview=0x55dabe28f1f8) at ./src/imap/imap-fetch-body.c:615 #19 0x000055dabc52b5cc in imap_fetch_more_int (ctx=0x55dabe26e050, cancel=false) at ./src/imap/imap-fetch.c:562 #20 0x000055dabc52b8ad in imap_fetch_more (ctx=0x55dabe26e050, cmd=0x55dabe26de98) at ./src/imap/imap-fetch.c:617 #21 0x000055dabc51fd07 in cmd_fetch (cmd=0x55dabe26de98) at ./src/imap/cmd-fetch.c:382 #22 0x000055dabc528af4 in command_exec (cmd=0x55dabe26de98) at ./src/imap/imap-commands.c:201 #23 0x000055dabc52e9e2 in client_command_input (cmd=<optimized out>) at ./src/imap/imap-client.c:1237 #24 0x000055dabc52ea96 in client_command_input (cmd=<optimized out>) at ./src/imap/imap-client.c:1307 #25 0x000055dabc52eeed in client_handle_next_command (remove_io_r=<synthetic pointer>, client=0x55dabe26d2c8) at ./src/imap/imap-client.c:1349 #26 client_handle_input (client=0x55dabe26d2c8) at ./src/imap/imap-client.c:1363 #27 0x000055dabc52f2c4 in client_input (client=0x55dabe26d2c8) at ./src/imap/imap-client.c:1407 #28 0x00007fcfb8bfe27d in io_loop_call_io (io=0x55dabe26e660) at ../lib/ioloop.c:737 #29 0x00007fcfb8bff81a in io_loop_handler_run_internal (ioloop=0x55dabe243fd0) at ../lib/ioloop-epoll.c:222 #30 0x00007fcfb8bff8d4 in io_loop_handler_run (ioloop=0x55dabe243fd0) at ../lib/ioloop.c:789 #31 0x00007fcfb8bffa90 in io_loop_run (ioloop=0x55dabe243fd0) at ../lib/ioloop.c:762 #32 0x00007fcfb8b6ce57 in master_service_run (service=0x55dabe243e20, callback=callback@entry=0x55dabc533210 <client_connected>) at ../lib-master/master-service.c:878 #33 0x000055dabc51ad37 in main (argc=<optimized out>, argv=<optimized out>) at ./src/imap/main.c:575 John Hello, I've found a crash in a very specific setup. A dovecot server with imapc connection needs to receive an email with no body contents for the intent of generating a preview/snippet. It crashes somewhere deep in the jungle of istream and snapshots. I've included a script which sets up the systems to reproduce the crash. I've tested this with several versions. 2.3.16 doesn't seem to be affected, but 2.3.20 and 2.3.21 are affect. For me it produces a traceback like this, using the ubuntu version from here: https://packages.ubuntu.com/noble/dovecot-core (gdb) bt #0 __pthread_kill_implementation (no_tid=0, signo=6, threadid=140530132887360) at ./nptl/pthread_kill.c:44 #1 __pthread_kill_internal (signo=6, threadid=140530132887360) at ./nptl/ pthread_kill.c:78 #2 __GI___pthread_kill (threadid=140530132887360, signo=signo@entry=6) at ./ nptl/pthread_kill.c:89 #3 0x00007fcfb8842476 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/ raise.c:26 #4 0x00007fcfb88287f3 in __GI_abort () at ./stdlib/abort.c:79 #5 0x00007fcfb8b37fe5 in default_fatal_finish (status=0, type=LOG_TYPE_PANIC) at ../lib/failures.c:465 #6 fatal_handler_real (ctx=<optimized out>, format=<optimized out>, args=<optimized out>) at ../lib/failures.c:477 #7 0x00007fcfb8be50d7 in i_internal_fatal_handler (ctx=<optimized out>, format=<optimized out>, args=<optimized out>) at ../lib/failures.c:879 #8 0x00007fcfb8b37eea in i_panic (format=0x7fcfb8c29020 "file %s: line %d (%s): assertion failed: (%s)") at ../lib/failures.c:530 #9 0x00007fcfb8b3387b in i_stream_header_filter_snapshot_free (_snapshot=<optimized out>) at ../lib-mail/istream-header-filter.c:663 #10 i_stream_header_filter_snapshot_free (_snapshot=0x55dabe297a60) at ../lib- mail/istream-header-filter.c:655 #11 0x00007fcfb8bf25ac in i_stream_snapshot_free (_snapshot=_snapshot@entry=0x55dabe29b0d0) at ../lib/istream.c:253 #12 0x00007fcfb8bf2654 in i_stream_unref (stream=0x7ffc16cc7fa0) at ../lib/ istream.c:66 #13 0x00007fcfb8d96baa in index_mail_write_body_snippet (mail=0x55dabe292058) at index/index-mail.c:1151 #14 0x00007fcfb8d97e48 in index_mail_parse_bodystructure (mail=0x55dabe292058, field=MAIL_CACHE_BODY_SNIPPET) at index/index-mail.c:1551 #15 0x00007fcfb8d97fe2 in index_mail_fetch_body_snippet (value_r=0x7ffc16cc8050, mail=0x55dabe292058) at index/index-mail.c:1602 #16 index_mail_get_special (_mail=0x55dabe292058, field=<optimized out>, value_r=0x7ffc16cc8050) at index/index-mail.c:1730 #17 0x00007fcfb8d16ffe in mail_get_special (mail=mail@entry=0x55dabe292058, field=field@entry=MAIL_FETCH_BODY_SNIPPET, value_r=value_r@entry=0x7ffc16cc8050) at /home/ubuntu/dovecot/new/dovecot-2.3.21+dfsg1/src/lib-storage/mail.c:418 #18 0x000055dabc52645c in fetch_snippet (ctx=0x55dabe26e050, mail=0x55dabe292058, preview=0x55dabe28f1f8) at ./src/imap/imap-fetch-body.c: 615 #19 0x000055dabc52b5cc in imap_fetch_more_int (ctx=0x55dabe26e050, cancel=false) at ./src/imap/imap-fetch.c:562 #20 0x000055dabc52b8ad in imap_fetch_more (ctx=0x55dabe26e050, cmd=0x55dabe26de98) at ./src/imap/imap-fetch.c:617 #21 0x000055dabc51fd07 in cmd_fetch (cmd=0x55dabe26de98) at ./src/imap/cmd- fetch.c:382 #22 0x000055dabc528af4 in command_exec (cmd=0x55dabe26de98) at ./src/imap/imap- commands.c:201 #23 0x000055dabc52e9e2 in client_command_input (cmd=<optimized out>) at ./src/ imap/imap-client.c:1237 #24 0x000055dabc52ea96 in client_command_input (cmd=<optimized out>) at ./src/ imap/imap-client.c:1307 #25 0x000055dabc52eeed in client_handle_next_command (remove_io_r=<synthetic pointer>, client=0x55dabe26d2c8) at ./src/imap/imap-client.c:1349 #26 client_handle_input (client=0x55dabe26d2c8) at ./src/imap/imap-client.c: 1363 #27 0x000055dabc52f2c4 in client_input (client=0x55dabe26d2c8) at ./src/imap/ imap-client.c:1407 #28 0x00007fcfb8bfe27d in io_loop_call_io (io=0x55dabe26e660) at ../lib/ ioloop.c:737 #29 0x00007fcfb8bff81a in io_loop_handler_run_internal (ioloop=0x55dabe243fd0) at ../lib/ioloop-epoll.c:222 #30 0x00007fcfb8bff8d4 in io_loop_handler_run (ioloop=0x55dabe243fd0) at ../ lib/ioloop.c:789 #31 0x00007fcfb8bffa90 in io_loop_run (ioloop=0x55dabe243fd0) at ../lib/ ioloop.c:762 #32 0x00007fcfb8b6ce57 in master_service_run (service=0x55dabe243e20, callback=callback@entry=0x55dabc533210 <client_connected>) at ../lib-master/ master-service.c:878 #33 0x000055dabc51ad37 in main (argc=<optimized out>, argv=<optimized out>) at ./src/imap/main.c:575 John

2 7

Missing IMAP METADATA Plugin
by Adam Miller 23 Aug '25

23 Aug '25

OS: Ubuntu 22.04.1 Dovecot: 2.3.16 (7e2e900c1a) When trying to enable the “imap_metadata” plugin, I get the following error: Plugin 'imap_metadata' not found from directory /usr/lib/dovecot/modules I have searched high and low via Google, StackOverflow and even ChatGPT (haha) but I cannot seem to find the package that provides the plugin. Does Dovecot have to be built from source for this plugin to be included? Any help is appreciated. Thank you!

8 8

Lots of problems with Dovecot 2.4
by sev+dovecot＠sev.monster 14 Aug '25

14 Aug '25

Hello all, I am trying to get Dovecot 2.4 running on Alpine Edge x86-64. But a myriad of problems have occurred that make it impossible to do so. First of all was the recent off-by-one bug that was recently fixed, which caused an unavoidable segfault on start under musl libc, which Alpine uses: https://gitlab.alpinelinux.org/alpine/aports/-/issues/17050 Then, I saw that the shadow driver was removed, which necessitated the installation of PAM and my learning about it... I haven't needed it before, so I'd never used it. I guess I understand why the decision was made to use PAM, though I still don't like it. After resolving those issue, I've run into new ones: 1. The passwd userdb does not seem to work correctly. It is able to get the first user and its information correctly, but any attempts to look up any user after that will seemingly always use the information from the first matched user. Setting max auths to 1 so that the auth process is discarded afterwards does not seem to help. For example, if the first user to log in to Dovecot is bob, and then user joe logs in, the information returned from the passwd userdb will all be that of user bob, not joe. This continues for all subsequent userdb lookups until Dovecot is restarted, and a new userdb lookup is persisted. Changing to passwd-file instead works and does not experience this problem. 2. Why is the only available username field for the passwd driver %{passwd:system_groups_user}? I understand what the purpose of the field is based on the docs, but shouldn't more than this be exposed? The fields available through passwd are also not documented, and I had to read the source to find them out. This should either be documented or a more standard username field be additionally exposed as with other drivers. Can this field even be relied on to use as the username, if the driver otherwise worked? 3. It seems the Exim auth driver is no longer able to successfully authenticate with Dovecot 2.4 against Exim 4.98.2. It works fine in the last version of 2.3.21.1. Has the authentication framework changed along with the other modifications that 2.4 underwent? Has any effort been made with the Exim team to resolve any incompatibilities? Can I somehow diagnose this issue if it's otherwise supposed to work? 4. The ldap driver can no longer look up missing fields from LDAP users. Some (but not all) of my users have the rfc2307bis schema posixAccount supplemental objectClass, and as such contain the posixHome, uidNumber, and gidNumber attributes—but even if I specify a default value, if one of the attributes is not queryable for the returned user, the lookup errors out and the login fails. This is a regression/undocumented change from 2.3.x, where instead of erroring out, the default_fields value would be used. Based on my interpretation of the design goals for 2.4, I would imagine the default filter would ignore the missing attribute error and set the default value like default_fields used to, no? Or am I missing something? 5. passdb_ldap_filter is always required for the ldap passdb driver, even if passdb_ldap_bind is enabled. Not only does this go against the docs, but the value is unused and it doesn't matter what it's set to. This is a regression from 2.3.x. Overall I am very unimpressed by 2.4. It clearly needed a lot more time in the oven and much more thorough testing. Relevant minimal config from my working 2.3.21.1 install: auth_username_format = %Ln auth_mechanisms = plain login passdb { driver = shadow } userdb { driver = passwd override_fields = gid=mail home=/var/mail/%Ln } passdb { driver = ldap args = /etc/dovecot/ldap-passdb.conf.ext #uris = ldapi://%2frun%2fopenldap%2fslapd.sock #base = ou=accounts,dc=ldap #auth_bind = yes #auth_bind_userdn = uid=%Ln,ou=accounts,dc=ldap } userdb { driver = ldap default_fields = uid=mail gid=mail home=/var/mail/%Ln args = /etc/dovecot/ldap-userdb.conf.ext #uris = ldapi://%2frun%2fopenldap%2fslapd.sock #dn = cn=dovecot,dc=ldap #dnpass = "some pw" #base = ou=accounts,dc=ldap #iterate_filter = (objectClass=inetOrgPerson) #iterate_attrs = uid=username #user_filter = (&(objectClass=inetOrgPerson)(uid=%Ln)) #user_attrs = homeDirectory=home,uidNumber=uid,gidNumber=gid } mail_location = maildir:/var/mail/%Ln mail_plugins = $mail_plugins virtual namespace inbox { inbox = yes mailbox INBOX { auto = subscribe } } namespace virtual { type = private separator = . prefix = "Search Folders." location = virtual:/etc/dovecot/virtual:INDEX=~/dovecot-virtual.cache:CONTROL=~/dovecot-virtual.cache:VOLATILEDIR=~/dovecot-virtual.cache # virtual/All/dovecot-virtual: #!INBOX #* #-Junk #-Junk* #-Spam #-Spam* #-Trash #-Trash* #-Deleted #-Deleted* #-Deleted Items #-Deleted Items* # all hidden = yes list = children subscriptions = no mailbox All { auto = subscribe special_use = \All comment = All messages, excluding Junk and Trash } } namespace virtual-user { type = private separator = . prefix = "User Search Folders." location = virtual:~/.virtual:INDEX=~/dovecot-virtual-user.cache:CONTROL=~/dovecot-virtual-user.cache:VOLATILEDIR=~/dovecot-virtual-user.cache:LAYOUT=maildir++ hidden = yes list = children subscriptions = no } service auth { unix_listener auth-userdb { # restrict userdb to dovecot user/group only instead of world read/write mode = 0660 user = $default_internal_user group = $default_internal_group } unix_listener auth-client { # give Exim access to native authentication mode = 0660 group = exim } } service auth-worker { # no need to run as root user = $default_internal_user # allow pam passdb to read /etc/shadow group = shadow } !include_try /usr/share/dovecot/protocols.d/*.conf protocol imap { mail_max_userip_connections = 25 } protocol pop3 { mail_max_userip_connections = 25 } Converted config for 2.4: dovecot_config_version = 2.4.1 dovecot_storage_version = 2.4.1 mail_home = /var/mail/%{user | username | lower } mail_driver = maildir mail_path = $SET:mail_home mail_plugins = virtual auth_username_format = %{user | username | lower } auth_mechanisms = plain login passdb pam { failure_show_msg = yes max_requests = 1 } userdb passwd-file { passwd_file_path = /etc/passwd fields { gid = mail } } # BUG: doesn't work right #userdb passwd { # fields { # gid = mail # } #} passdb ldap { ldap_uris = ldapi://%2frun%2fopenldap%2fslapd.sock ldap_connection_group = login ldap_base = ou=accounts,dc=ldap ldap_bind = yes ldap_bind_userdn = uid=%{user | username | lower },ou=accounts,dc=ldap # XXX: thought this wasnt needed with bind? ldap_filter = z } userdb ldap { ldap_uris = ldapi://%2frun%2fopenldap%2fslapd.sock ldap_auth_dn = cn=dovecot,dc=ldap ldap_auth_dn_password = "some pw" ldap_base = ou=accounts,dc=ldap ldap_filter = (&(objectClass=inetOrgPerson)(uid=%{user | username | lower })) fields { username = %{ldap:uid} # BUG: causes errors if rfc2307bis posixAccount objectClass is not set home = %{ldap:homeDirectory | default($SET:mail_home)} uid = %{ldap:uidNumber | default(mail)} gid = %{ldap:gidNumber | default(mail)} } ldap_iterate_filter = (objectClass=inetOrgPerson) iterate_fields { username = %{ldap:uid} } } namespace inbox { inbox = yes mailbox INBOX { auto = subscribe } } namespace virtual { type = private separator = . prefix = "Search Folders." mail_driver = virtual mail_path = /etc/dovecot/virtual # virtual/All/dovecot-virtual: #!INBOX #* #-Junk #-Junk* #-Spam #-Spam* #-Trash #-Trash* #-Deleted #-Deleted* #-Deleted Items #-Deleted Items* # all mail_index_path = ~/dovecot-virtual.cache mail_control_path = ~/dovecot-virtual.cache mail_volatile_path = ~/dovecot-virtual.cache hidden = yes list = children subscriptions = no mailbox All { auto = subscribe special_use = \All comment = All messages, excluding Junk and Trash } } namespace virtual-user { type = private separator = . prefix = "User Search Folders." mail_driver = virtual mail_path = ~/dovecot-virtual-user mail_index_path = ~/dovecot-virtual-user.cache mail_control_path = ~/dovecot-virtual-user.cache mail_volatile_path = ~/dovecot-virtual-user.cache mailbox_list_layout = Maildir++ hidden = yes list = children subscriptions = no } service auth { unix_listener auth-userdb { # restrict userdb to dovecot user/group only instead of world read/write mode = 0660 } unix_listener auth-client { # give Exim access to native authentication mode = 0660 group = exim } } service auth-worker { # no need to run as root user = $SET:default_internal_user # allow pam passdb to read /etc/shadow group = shadow } protocols = imap pop3 protocol imap { mail_max_userip_connections = 25 } protocol pop3 { mail_max_userip_connections = 25 } In addition to help with the noted issues, I'd also love if anyone more knowledgeable on Dovecot 2.4 could give any pointers on my config and if I could improve the translation in any way, given I have been fumbling around with it for weeks and am not really sure if my various decisions are correct. Best regards.

7 8

[Patch] Allow sieve redirects to specified domains only
by Kadlecsik József 10 Aug '25

10 Aug '25

Hello, The use case is simple: we have to forbid sieve redirects to outside, but should be able to redirect inside. The patch below adds a new sieve configuration option sieve_allowed_redirects to list the domains to which redirects are permitted and otherwise are not allowed. Please consider it. diff --git a/pigeonhole/doc/example-config/conf.d/90-sieve.conf b/pigeonhole/doc/example-config/conf.d/90-sieve.conf index 238bcf4..3b4ac65 100644 --- a/pigeonhole/doc/example-config/conf.d/90-sieve.conf +++ b/pigeonhole/doc/example-config/conf.d/90-sieve.conf @@ -126,6 +126,10 @@ plugin { # script execution. If set to 0, no redirect actions are allowed. #sieve_max_redirects = 4 + # The comma/space separated list of email domains where redirection is allowed. + # If the list is empty, there is no restriction. + sieve_allowed_redirects = + # The maximum number of personal Sieve scripts a single user can have. If set # to 0, no limit on the number of scripts is enforced. # (Currently only relevant for ManageSieve) diff --git a/pigeonhole/src/lib-sieve/cmd-redirect.c b/pigeonhole/src/lib-sieve/cmd-redirect.c index 6a3b0a4..17e9031 100644 --- a/pigeonhole/src/lib-sieve/cmd-redirect.c +++ b/pigeonhole/src/lib-sieve/cmd-redirect.c @@ -107,6 +107,24 @@ const struct sieve_action_def act_redirect = { .commit = act_redirect_commit, }; +static bool +cmd_redirect_allowed(struct sieve_instance *svinst, + const struct smtp_address *to_address) +{ + const char **domain; + bool result = TRUE; + + if (!svinst->allowed_redirects) + return TRUE; + for (domain = svinst->allowed_redirects; *domain != NULL; ++domain) { + if (strcasecmp(*domain, to_address->domain) == 0) { + return TRUE; + } + result = FALSE; + } + return result; +} + /* * Validation */ @@ -127,6 +145,12 @@ cmd_redirect_validate(struct sieve_validator *validator, if (!sieve_validator_argument_activate(validator, cmd, arg, FALSE)) return FALSE; + if (svinst->max_redirects == 0) { + sieve_command_validate_error(validator, cmd, + "local policy prohibits the use of a redirect action"); + return FALSE; + } + /* We can only assess the validity of the outgoing address when it is * a string literal. For runtime-generated strings this needs to be * done at runtime. @@ -148,14 +172,17 @@ cmd_redirect_validate(struct sieve_validator *validator, } } T_END; + if (!result && + !cmd_redirect_allowed(svinst, + sieve_address_parse_str(raw_address, &error))) { + sieve_command_validate_error(validator, cmd, + "local policy prohibits the use of a redirect action"); + return FALSE; + } + return result; } - if (svinst->max_redirects == 0) { - sieve_command_validate_error(validator, cmd, - "local policy prohibits the use of a redirect action"); - return FALSE; - } return TRUE; } @@ -238,6 +265,11 @@ cmd_redirect_operation_execute(const struct sieve_runtime_env *renv, "local policy prohibits the use of a redirect action"); return SIEVE_EXEC_FAILURE; } + if (!cmd_redirect_allowed(svinst, to_address)) { + sieve_runtime_error(renv, NULL, + "local policy prohibits the use of a redirect action"); + return SIEVE_EXEC_FAILURE; + } if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_ACTIONS)) { sieve_runtime_trace(renv, 0, "redirect action"); diff --git a/pigeonhole/src/lib-sieve/sieve-common.h b/pigeonhole/src/lib-sieve/sieve-common.h index e79fb4d..d980c9d 100644 --- a/pigeonhole/src/lib-sieve/sieve-common.h +++ b/pigeonhole/src/lib-sieve/sieve-common.h @@ -209,6 +209,7 @@ struct sieve_instance { const struct smtp_address *user_email, *user_email_implicit; struct sieve_address_source redirect_from; unsigned int redirect_duplicate_period; + const char **allowed_redirects; }; /* diff --git a/pigeonhole/src/lib-sieve/sieve-settings.c b/pigeonhole/src/lib-sieve/sieve-settings.c index 47f70da..70addc7 100644 --- a/pigeonhole/src/lib-sieve/sieve-settings.c +++ b/pigeonhole/src/lib-sieve/sieve-settings.c @@ -267,4 +267,10 @@ void sieve_settings_load(struct sieve_instance *svinst) svinst->user_email = address; } } + svinst->allowed_redirects = NULL; + str_setting = sieve_setting_get(svinst, "sieve_allowed_redirects"); + if (str_setting != NULL && *str_setting != '\0') { + svinst->allowed_redirects = + (const char **)p_strsplit_spaces(svinst->pool, str_setting, ", "); + } } Best regards, Jozsef -- E-mail : kadlecsik.jozsef(a)wigner.hun-ren.hu PGP key: https://wigner.hu/~kadlec/pgp_public_key.txt Address: Wigner Research Centre for Physics H-1525 Budapest 114, POB. 49, Hungary

2 1

how to fix this
by Marc 01 Jul '25

01 Jul '25

doveadm force-resync -u $account INBOX doveadm(): Warning: fscking index file /.../index/storage/dovecot.map.index doveadm(): Warning: mdbox /.../mdbox/storage: rebuilding indexes doveadm(): Error: Couldn't open mailbox 'foldertest1751045732429': Mailbox doesn't exist: foldertest1751045732429 doveadm(): Error: Couldn't open mailbox 'foldertest1751045732429/foldertest': Mailbox doesn't exist: foldertest1751045732429/foldertest doveadm(): Error: Couldn't open mailbox 'foldertest17485243507278': Mailbox doesn't exist: foldertest17485243507278 doveadm(): Error: Couldn't open mailbox 'foldertest17485243507278/foldertest': Mailbox doesn't exist: foldertest17485243507278/foldertest doveadm(): Error: Couldn't open mailbox 'Trash/test': Mailbox doesn't exist: Trash/test doveadm(): Error: Couldn't open mailbox 'INBOX/test-files': Mailbox doesn't exist: INBOX/test-files doveadm(): Warning: fscking index file /.../index/storage/dovecot.map.index

2 5

sievec fails when run as non-root - bug?
by Genes Lists 30 Jun '25

30 Jun '25

1) With 2.4.1, when a non-root user runs sievec on their own sieve scripts it fails to run due to permission denied on the dovecot certificate key (which is only readable by root). Specifically: sievec active.sieve doveconf: Fatal: Error in configuration file /etc/dovecot/conf.d/10- ssl.conf line 10: cert_file: open(/etc/.../fullchain.pem) failed: Permission denied What is recommended way to deal with this? 2) Separate question: Might this explain why users sieve scripts are not running? I assume not as there are no 'sieve' items reported by lmtp in the logs. Config has: protocol lmtp { postmaster_address = postmaster@<domain>.com mail_plugins { sieve = yes } hostname = imap.<domain>.com } sieve_script before { driver = file path = /etc/dovecot/sieve/global active_path = remove_dup.sieve } sieve_script personal { driver = file path = ~/sieve active_path = ~/.dovecot.sieve } sieve_script after { driver = file path = /etc/dovecot/sieve active_path = default.sieve } thanks. -- Gene

2 5

Identifying spamd problems
by Francis Augusto Medeiros-Logeay 27 Jun '25

27 Jun '25

Hi, I have use Dovecot, Spamassassin and Roundcube. My spam assassin is configured to use SQL. I have noticed that when I move a message to the junk folder, it increases the number of spam on the database. But when I move it out of the junk folder, it doesn’t increase the ham nor decreases the spam count. When running sa-learn manually, it does everything right. Here’s now 90-sieve.conf is configured; ieve_plugins = sieve_imapsieve sieve_extprograms sieve_before = /var/mail/vmail/mail/sieve/global/spam-global.sieve sieve = file:/var/mail/vmail/mail/sieve/%d/%n/scripts;active=/var/mail/vmail/mail/sieve/%d/%n/active-script.sieve imapsieve_mailbox1_name = Spam imapsieve_mailbox1_causes = COPY imapsieve_mailbox1_before = file:/var/mail/vmail/mail/sieve/global/report-spam.sieve imapsieve_mailbox2_name = * imapsieve_mailbox2_from = Spam imapsieve_mailbox2_causes = COPY imapsieve_mailbox2_before = file:/var/mail/vmail/mail/sieve/global/report-ham.sieve imapsieve_mailbox2_name = Archive imapsieve_mailbox2_from = * imapsieve_mailbox2_causes = COPY imapsieve_mailbox2_before = file:/var/mail/vmail/mail/sieve/global/report-ham.sieve sieve_execute_bin_dir = /usr/bin sieve_pipe_bin_dir = /var/mail/vmail/mail/sieve/global/scripts sieve_global_extensions = +vnd.dovecot.pipe +vnd.dovecot.execute And here’s hoe my scripts are: /var/mail/vmail/mail/sieve/global/report-spam.sieve^C root@9c8c309ee769:/# cat /var/mail/vmail/mail/sieve/global/report-spam.sieve require ["vnd.dovecot.pipe", "copy", "imapsieve", "environment", "variables", "vnd.dovecot.execute" ]; if environment :matches "imap.user" "*" { set "username" "${1}"; } pipe :copy "sa-learn-spam.sh" [ "${username}" ]; /var/mail/vmail/mail/sieve/global/report-ham.sieve require ["vnd.dovecot.pipe", "copy", "imapsieve", "environment", "variables"]; if environment :matches "imap.mailbox" "*" { set "mailbox" "${1}"; } if string "${mailbox}" "Trash" { stop; } if environment :matches "imap.user" "*" { set "username" "${1}"; } pipe :copy "sa-learn-ham.sh" [ "${username}" ]; sa-learn-ham.sh: #!/bin/sh export PATH="/usr/sbin:/usr/bin:/usr/local/bin:/usr/local/sbin:$PATH" exec /usr/bin/spamc -u ${1} -L ham exit 0 sa-learn-spam.sh #!/bin/sh export PATH="/usr/sbin;/usr/bin;/usr/local/bin;/usr/local/sbin;" exec /usr/bin/spamc -u ${1} -L spam Should I change for example: exec /usr/bin/spamc -u ${1} -L ham to exec /usr/bin/sa-learn -u ${1} —ham ? Best, Francis Hi, I have use Dovecot, Spamassassin and Roundcube. My spam assassin is configured to use SQL. I have noticed that when I move a message to the junk folder, it increases the number of spam on the database. But when I move it out of the junk folder, it doesn’t increase the ham nor decreases the spam count. When running sa-learn manually, it does everything right. Here’s now 90-sieve.conf is configured; ieve_plugins = sieve_imapsieve sieve_extprograms sieve_before = /var/mail/vmail/mail/sieve/global/spam-global.sieve sieve = file:/var/mail/vmail/mail/sieve/%d/%n/scripts;active=/var/mail/ vmail/mail/sieve/%d/%n/active-script.sieve imapsieve_mailbox1_name = Spam imapsieve_mailbox1_causes = COPY imapsieve_mailbox1_before = file:/var/mail/vmail/mail/sieve/global/report- spam.sieve imapsieve_mailbox2_name = * imapsieve_mailbox2_from = Spam imapsieve_mailbox2_causes = COPY imapsieve_mailbox2_before = file:/var/mail/vmail/mail/sieve/global/report- ham.sieve imapsieve_mailbox2_name = Archive imapsieve_mailbox2_from = * imapsieve_mailbox2_causes = COPY imapsieve_mailbox2_before = file:/var/mail/vmail/mail/sieve/global/report- ham.sieve sieve_execute_bin_dir = /usr/bin sieve_pipe_bin_dir = /var/mail/vmail/mail/sieve/global/scripts sieve_global_extensions = +vnd.dovecot.pipe +vnd.dovecot.execute And here’s hoe my scripts are: /var/mail/vmail/mail/sieve/global/report-spam.sieve^C root@9c8c309ee769:/# cat /var/mail/vmail/mail/sieve/global/report-spam.sieve require ["vnd.dovecot.pipe", "copy", "imapsieve", "environment", "variables", "vnd.dovecot.execute" ]; if environment :matches "imap.user" "*" { set "username" "${1}"; } pipe :copy "sa-learn-spam.sh" [ "${username}" ]; /var/mail/vmail/mail/sieve/global/report-ham.sieve require ["vnd.dovecot.pipe", "copy", "imapsieve", "environment", "variables"]; if environment :matches "imap.mailbox" "*" { set "mailbox" "${1}"; } if string "${mailbox}" "Trash" { stop; } if environment :matches "imap.user" "*" { set "username" "${1}"; } pipe :copy "sa-learn-ham.sh" [ "${username}" ]; sa-learn-ham.sh: #!/bin/sh export PATH="/usr/sbin:/usr/bin:/usr/local/bin:/usr/local/sbin:$PATH" exec /usr/bin/spamc -u ${1} -L ham exit 0 sa-learn-spam.sh #!/bin/sh export PATH="/usr/sbin;/usr/bin;/usr/local/bin;/usr/local/sbin;" exec /usr/bin/spamc -u ${1} -L spam Should I change for example: exec /usr/bin/spamc -u ${1} -L ham to exec /usr/bin/sa-learn -u ${1} —ham ? Best, Francis

1 0

SASL authentication against LDAP w/ client certs, supposed to work?
by Bruno Hertz 26 Jun '25

26 Jun '25

Hi all I'm currently testing Dovecot 2.4, considering a migration from 2.3, and all works fine except authentication against LDAP (openldap slapd) with client certificates. Which I had no problem with on 2.3 for seven years or so. Versions: Linux Alpine 3.22 Dovecot 2.4.1-4 (7d8c0e5759) Alpine package, but patched with https://github.com/dovecot/core/commit/431e328b3b035ddb187526cd13bccf29833a… Now, first a Dovecot configuration that does work, unencrypted simple bind against Unix domain socket: ldap_version = 3 ldap_uris = ldapi:/// ldap_base = ou=users,dc=mydomain,dc=internal ldap_auth_dn = cn=dovecot,dc=mydomain,dc=internal ldap_auth_dn_password = secret passdb ldap { bind = no default_password_scheme = SSHA ldap_filter = (&(objectClass=posixAccount)(uid=%{user})) fields { user = %{ldap:uid} password = %{ldap:userPassword} } } Meaning I'm doing password lookups, IMAP users can authenticate against Dovecot, Postfix correctly delivers incoming emails, everything works flawlessly. Now the setup I'm talking about, which does not work: ldap_version = 3 ldap_uris = ldaps://localhost.mydomain.internal ldap_base = ou=users,dc=mydomain,dc=internal ldap_auth_sasl_mechanisms = external ssl_client_cert_file = /etc/ssl/ldap/dovecot.crt ssl_client_key_file = /etc/ssl/ldap/dovecot.key # this just as a precaution during testing, validation *does* work ssl_client_require_valid_cert = no ssl_client_ca_dir = /etc/ssl/certs passdb ldap { bind = no default_password_scheme = SSHA ldap_filter = (&(objectClass=posixAccount)(uid=%{user})) fields { user = %{ldap:uid} password = %{ldap:userPassword} } } What happens here, as far as I can see, is Dovecot connects to slapd, initiates a SASL session but then fails to send the client certificate. slapd realizes the cert isn't coming, asserts there's no other SASL "external" method to fall back to and disconnects Dovecot. Game over. Now, before somebody thinks 'maybe something wrong with the certs or so', the very same setup on the very same machine works perfectly with two other client types, namely - openldap standard utils - postfix (recipient lookup) With the utils I have this setup, with the same client cert URI ldaps://localhost.mydomain.internal BASE ou=users,dc=mydomain,dc=internal SASL_MECH external TLS_REQCERT demand TLS_CACERT /root/ssl/ca.crt TLS_CERT /etc/ssl/ldap/dovecot.crt TLS_KEY /etc/ssl/ldap/dovecot.key and ldapwhoami connects without problem, and with ldapsearch I can perform the very same searches Dovecot is supposed to do. Postfix, for recipient lookups, I have configured like this: version = 3 server_host = ldaps://localhost.mydomain.internal search_base = ou=users,dc=mydomain,dc=internal query_filter = (&(mail=%s)) result_attribute = uid bind = sasl sasl_mechs = external tls_require_cert = demand tls_ca_cert_dir = /etc/ssl/certs tls_cert = /etc/ssl/ldap/dovecot.crt tls_key = /etc/ssl/ldap/dovecot.key Again, no problem to authenticate agains LDAP with the very same client certificate. The CA is correctly installed into /etc/ssl/certs , by the way, with update-ca-certificates. So out of 3 client types with the very same setup only Dovecot fails to successfully negotiate the client cert SASL session, while, after a good look through the docs, I really don't see any other settings I could tweak. Thoughts? Greetings, Bruno

2 6

Dovecot quota and IMAP MOVE
by marekstefanka＠duck.com 26 Jun '25

26 Jun '25

Hello, I would like to kindly ask, if there is some recommendation for dovecot quota configuration, to prevent quota-warning triggering when IMAP MOVE command is executed close to some thresholds. Problem seems to be this: Jun 10 11:08:20 srv1 dovecot[39677]: imap(box1(a)domain.com)<48726><0aCoCTQ3TC8KHgcC>: Debug: quota: Executing warning: quota-warning box1(a)domain.com (because bytes=3713971 -> 7301217 over limit 4096000) Jun 10 11:08:20 srv1 dovecot[39677]: imap(box1(a)domain.com)<48726><0aCoCTQ3TC8KHgcC>: Debug: quota: Executing warning: quota-warning box1(a)domain.com (because bytes=7301217 -> 3713971 below limit 4096000) So during any IMAP MOVE, which is copy-then-delete process, quota goes over and then below limit, triggering closest threshold. Quota config: quota = count:User quota quota_vsizes = yes # default, we specific user limits via sql quota_rule = *:storage=0 quota_grace = 50M quota_warning = storage=100%% quota-warning %u quota_warning2 = -storage=100%% quota-warning %u quota_warning3 = storage=90%% quota-warning %u quota_warning4 = storage=80%% quota-warning %u Recommended fix does not seems to work (tried multiple namespaces): quota_rule = Folder:storage=+100M Dovecot version is 2.3.21.1 Thank you for any help with this.

2 1