- dovecot - dovecot.org

Postfix : root and system user authentication
by Aymeric Agon-Rambosson 16 Mar '23

16 Mar '23

Hello everyone, >From what I understand of the documentation, it is impossible to log in to the dovecot server as root, or as any user not in the interval between first_valid_uid and last_valid_uid. I have been able to verify this. However, when we have a postfix server on the same machine, that delegates authentication to dovecot SASL according to the configuration described at https://doc.dovecot.org/configuration_manual/howto/postfix_and_dovecot_sasl/, we can indeed log in as root on the postfix server. Proof (/var/log/mail.log with auth=debug) : Mar 13 20:16:37 ricorambo dovecot: auth: Debug: client in: AUTH#0111#011PLAIN#011service=smtp#011nologin#011lip=<redacted>#011rip=<redacted>#011secured#011resp=<hidden> Mar 13 20:16:37 ricorambo dovecot: auth: Debug: pam(root,<redacted>): Performing passdb lookup Mar 13 20:16:37 ricorambo dovecot: auth-worker(136499): Debug: Loading modules from directory: /usr/lib/dovecot/modules/auth Mar 13 20:16:37 ricorambo dovecot: auth-worker(136499): Debug: Module loaded: /usr/lib/dovecot/modules/auth/lib20_auth_var_expand_crypt.so Mar 13 20:16:37 ricorambo dovecot: auth-worker(136499): Debug: conn unix:auth-worker (pid=136444,uid=111): Server accepted connection (fd=13) Mar 13 20:16:37 ricorambo dovecot: auth-worker(136499): Debug: conn unix:auth-worker (pid=136444,uid=111): Sending version handshake Mar 13 20:16:37 ricorambo dovecot: auth-worker(136499): Debug: conn unix:auth-worker (pid=136444,uid=111): auth-worker<1>: Handling PASSV request Mar 13 20:16:37 ricorambo dovecot: auth-worker(136499): Debug: conn unix:auth-worker (pid=136444,uid=111): auth-worker<1>: pam(root,<redacted>): Performing passdb lookup Mar 13 20:16:37 ricorambo dovecot: auth-worker(136499): Debug: conn unix:auth-worker (pid=136444,uid=111): auth-worker<1>: pam(root,<redacted>): lookup service=dovecot Mar 13 20:16:37 ricorambo dovecot: auth-worker(136499): Debug: conn unix:auth-worker (pid=136444,uid=111): auth-worker<1>: pam(root,<redacted>): #1/1 style=1 msg=Password: Mar 13 20:16:37 ricorambo dovecot: auth-worker(136499): Debug: conn unix:auth-worker (pid=136444,uid=111): auth-worker<1>: pam(root,<redacted>): Finished passdb lookup Mar 13 20:16:37 ricorambo dovecot: auth-worker(136499): Debug: conn unix:auth-worker (pid=136444,uid=111): auth-worker<1>: Finished Mar 13 20:16:37 ricorambo dovecot: auth: Debug: pam(root,<redacted>): Finished passdb lookup Mar 13 20:16:37 ricorambo dovecot: auth: Debug: auth(root,<redacted>): Auth request finished Mar 13 20:16:37 ricorambo dovecot: auth: Debug: client passdb out: OK#0111#011user=root#011 At this moment, the smtps client connecting to postfix produces "Authentication successful" and we can continue. In contrast, when we try to login to dovecot directly as root, we have the following : Mar 13 20:28:38 ricorambo dovecot: auth: Debug: client in: AUTH#0111#011PLAIN#011service=imap#011secured=tls#011session=<redacted>#011lip=<redacted>#011rip=<redacted>#011lport=993#011rport=52004#011local_name=mail.ricorambo.su#011resp=<hidden> Mar 13 20:28:38 ricorambo dovecot: auth: Debug: pam(root,<redacted>,<redacted>): Performing passdb lookup Mar 13 20:28:38 ricorambo dovecot: auth-worker(137089): Debug: Loading modules from directory: /usr/lib/dovecot/modules/auth Mar 13 20:28:38 ricorambo dovecot: auth-worker(137089): Debug: Module loaded: /usr/lib/dovecot/modules/auth/lib20_auth_var_expand_crypt.so Mar 13 20:28:38 ricorambo dovecot: auth-worker(137089): Debug: conn unix:auth-worker (pid=137079,uid=111): Server accepted connection (fd=13) Mar 13 20:28:38 ricorambo dovecot: auth-worker(137089): Debug: conn unix:auth-worker (pid=137079,uid=111): Sending version handshake Mar 13 20:28:38 ricorambo dovecot: auth-worker(137089): Debug: conn unix:auth-worker (pid=137079,uid=111): auth-worker<1>: Handling PASSV request Mar 13 20:28:38 ricorambo dovecot: auth-worker(137089): Debug: conn unix:auth-worker (pid=137079,uid=111): auth-worker<1>: pam(root,<redacted>,<redacted>): Performing passdb lookup Mar 13 20:28:38 ricorambo dovecot: auth-worker(137089): Debug: conn unix:auth-worker (pid=137079,uid=111): auth-worker<1>: pam(root,<redacted>,<redacted>): lookup service=dovecot Mar 13 20:28:38 ricorambo dovecot: auth-worker(137089): Debug: conn unix:auth-worker (pid=137079,uid=111): auth-worker<1>: pam(root,<redacted>,<redacted>): #1/1 style=1 msg=Password: Mar 13 20:28:38 ricorambo dovecot: auth-worker(137089): Debug: conn unix:auth-worker (pid=137079,uid=111): auth-worker<1>: pam(root,<redacted>,<redacted>): Finished passdb lookup Mar 13 20:28:38 ricorambo dovecot: auth-worker(137089): Debug: conn unix:auth-worker (pid=137079,uid=111): auth-worker<1>: Finished Mar 13 20:28:38 ricorambo dovecot: auth: Debug: pam(root,<redacted>,<eU8pHs32JMuE40wF>): Finished passdb lookup Mar 13 20:28:38 ricorambo dovecot: auth: Debug: auth(root,<redacted>,<eU8pHs32JMuE40wF>): Auth request finished Mar 13 20:28:38 ricorambo dovecot: auth: Debug: client passdb out: OK#0111#011user=root#011#011original_user=root(a)ricorambo.su Mar 13 20:28:38 ricorambo dovecot: auth: Debug: master in: REQUEST#<redacted> Mar 13 20:28:38 ricorambo dovecot: auth: Debug: passwd(root,<redacted>,<redacted>): Performing userdb lookup Mar 13 20:28:38 ricorambo dovecot: auth-worker(137089): Debug: conn unix:auth-worker (pid=137079,uid=111): auth-worker<2>: Handling USER request Mar 13 20:28:38 ricorambo dovecot: auth-worker(137089): Debug: conn unix:auth-worker (pid=137079,uid=111): auth-worker<2>: passwd(root,<redacted>,<redacted>): Performing userdb lookup Mar 13 20:28:38 ricorambo dovecot: auth-worker(137089): Debug: conn unix:auth-worker (pid=137079,uid=111): auth-worker<2>: passwd(root,<redacted>,<redacted>): lookup Mar 13 20:28:38 ricorambo dovecot: auth-worker(137089): Debug: conn unix:auth-worker (pid=137079,uid=111): auth-worker<2>: passwd(root,<redacted>,<redacted>): Finished userdb lookup Mar 13 20:28:38 ricorambo dovecot: auth-worker(137089): Debug: conn unix:auth-worker (pid=137079,uid=111): auth-worker<2>: Finished Mar 13 20:28:38 ricorambo dovecot: auth: Debug: passwd(root,<redacted>,<redacted>): Finished userdb lookup Mar 13 20:28:38 ricorambo dovecot: auth: Debug: master userdb out: USER#<redacted> Mar 13 20:28:38 ricorambo dovecot: imap-login: Login: user=<root>, method=PLAIN, rip=<redacted>, lip=192.168.1.22, mpid=137090, TLS, session=<redacted> Mar 13 20:28:38 ricorambo dovecot: imap(root): Error: Invalid settings in userdb: userdb returned 0 as uid Mar 13 20:28:38 ricorambo dovecot: imap(root): Warning: Event 0xaaab0e9db2a0 leaked (parent=0xaaab0e9cdc80): mail-storage-service.c:1336 Mar 13 20:28:38 ricorambo dovecot: imap(root): Warning: Event 0xaaab0e9cdc80 leaked (parent=(nil)): main.c:246 At this moment, the imap client produces "Internal server error" and finishes. Steps to reproduce : - Delegate SASL authentication from postfix to dovecot as such : /etc/postfix/master.cf smtps inet n - y - - smtpd -o syslog_name=postfix/smtps -o smtpd_tls_wrappermode=yes -o smtpd_sasl_auth_enable=yes -o smtpd_relay_restrictions=permit_sasl_authenticated,reject -o smtpd_recipient_restrictions=permit_sasl_authenticated,reject -o smtpd_sasl_type=dovecot -o smtpd_sasl_path=private/auth and of course : /etc/dovecot/conf.d/10-master.conf unix_listener /var/spool/postfix/private/auth { mode = 0660 user = postfix group = postfix } - login to your server, port 465, with a client like openssl : openssl s_client -connect mail.example.org:465 EHLO whateveryouwant AUTH PLAIN \0root\0password (in base 64, ofc) You should be able to login, and produce the first log trace I have included. My question is, is this a feature or a bug ? The hardcoded impossibility to login as root to dovecot, and the honouring of the variables {first,last}_valid_{u,g}id, are those specific to login to dovecot directly, or should they be applicable to any other process that has delegated its authentication to dovecot ? If this is a feature, that is if postfix cannot profit from the variables {first,last}_valid_{u,g}id (or the hardcoded forbidding of root) through dovecot sasl : - This should maybe made more obvious somewhere in the documentation. - What would be the good way to prevent root login to postfix, when authentication is delegated to dovecot ? The dovecot version is 2.3.13 (89f716dc2) The system is the following : Linux 5.10.0-21-arm64 #1 SMP Debian 5.10.162-1 (2023-01-21) aarch64 GNU/Linux Thank you in advance for your time. I have included the output of dovecot -n for reference. Best regards, Aymeric

6 10

Build dovecot from source
by Horst Simon 16 Mar '23

16 Mar '23

I am sorry if this is not the correct list for asking this. T try to build dovecot 2.3.20 from source on a QNAP NAS, which is a linux variant. There is an dovecot available, but this does not include a pigeonhole sieve, that’s why I try to build it from source. The configure script works fine, but the make fails as follows: *** Warning: Linking the executable test-http-payload against the loadable module *** libssl_iostream_openssl.so is not portable! libtool: link: gcc -std=gnu99 -g -O2 -fstack-protector-strong -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -mfunction-return=keep -mindirect-branch=keep -Wall -W -Wmissing-prototypes -Wmissing-declarations -Wpointer-arith -Wchar-subscripts -Wformat=2 -Wbad-function-cast -fno-builtin-strftime -Wstrict-aliasing=2 -Wl,--as-needed -o .libs/test-http-payload test-http-payload.o -Wl,--export-dynamic -L/share/CACHEDEV1_DATA/.qpkg/Entware/lib -L/share/CACHEDEV1_DATA/.qpkg/Apache81/lib ./.libs/libhttp.a ../lib-dns/.libs/libdns.a ../lib-ssl-iostream/.libs/libssl_iostream.a ../lib-master/.libs/libmaster.a ../lib-auth/.libs/libauth.a ../lib-settings/.libs/libsettings.a ../lib-test/.libs/libtest.a ../lib/.libs/liblib.a -ldl ../lib-ssl-iostream/.libs/libssl_iostream_openssl.so -Wl,-rpath -Wl,/opt/lib/dovecot /opt/bin/ld: ../lib-ssl-iostream/.libs/libssl_iostream_openssl.so: undefined reference to `ENGINE_set_default@OPENSSL_1_1_0' /opt/bin/ld: ../lib-ssl-iostream/.libs/libssl_iostream_openssl.so: undefined reference to `ENGINE_init@OPENSSL_1_1_0' /opt/bin/ld: ../lib-ssl-iostream/.libs/libssl_iostream_openssl.so: undefined reference to `ENGINE_load_builtin_engines@OPENSSL_1_1_0' /opt/bin/ld: ../lib-ssl-iostream/.libs/libssl_iostream_openssl.so: undefined reference to `ENGINE_free@OPENSSL_1_1_0' /opt/bin/ld: ../lib-ssl-iostream/.libs/libssl_iostream_openssl.so: undefined reference to `ENGINE_finish@OPENSSL_1_1_0' /opt/bin/ld: ../lib-ssl-iostream/.libs/libssl_iostream_openssl.so: undefined reference to `ENGINE_by_id@OPENSSL_1_1_0' collect2: error: ld returned 1 exit status make[3]: *** [Makefile:892: test-http-payload] Error 1 make[3]: Leaving directory '/share/CACHEDEV1_DATA/temp/dovecot-2.3.20/src/lib-http' make[2]: *** [Makefile:573: all-recursive] Error 1 make[2]: Leaving directory '/share/CACHEDEV1_DATA/temp/dovecot-2.3.20/src' make[1]: *** [Makefile:702: all-recursive] Error 1 make[1]: Leaving directory '/share/CACHEDEV1_DATA/temp/dovecot-2.3.20' make: *** [Makefile:546: all] Error 2 I already asked in the GitHub forum, but haven’t received any answers, that why I m asking here if anyone can help me to get it working. Horst

1 0

Bug with lmtp_save_to_detail_mailbox
by Dejan 15 Mar '23

15 Mar '23

> lmtp_save_to_detail_mailbox = yes Plus-delivery conflicts with existing, reserved files such as "subscriptions": Message for kim+subscriptions@ results in: lmtp(kim(a)***.com)<14493><SK7sEvaHEWSdOAAAvAYmHA>: Error: ....stat(/var/mails/***/kim/Maildir/subscriptions/tmp) failed: Not a directory Version: 2.3.18

2 4

dovecot crash with Panic: file istream-header-filter.c: line 663
by Patrick Mansfield 13 Mar '23

13 Mar '23

Hi - I'm hitting a crash in dovecot, I get this logged followed by a terse stack trace and systemd-coredump details not included here - full gdb stack trace and more details are further down: Mar 12 10:32:26 goffin dovecot[8269]: imap-login: Login: user=<patman>, method=PLAIN, rip=192.168.1.4, lip=192.168.1.1, mpid=8477, TLS, session=<5RvGYLf2RrDAqAEE> Mar 12 10:32:26 goffin audit[8304]: USER_AUTH pid=8304 uid=0 auid=4294967295 ses=4294967295 subj=kernel msg='op=PAM:authentication grantors=pam_usertype,pam_localuser,pam_unix acct="patman" exe="/usr/libexec/dovecot/auth" hostname=192.168.1.4 addr=192.168.1.4 terminal=dovecot res=success' Mar 12 10:32:26 goffin audit[8304]: USER_ACCT pid=8304 uid=0 auid=4294967295 ses=4294967295 subj=kernel msg='op=PAM:accounting grantors=pam_unix,pam_localuser acct="patman" exe="/usr/libexec/dovecot/auth" hostname=192.168.1.4 addr=192.168.1.4 terminal=dovecot res=success' Mar 12 10:32:26 goffin dovecot[8269]: imap-login: Login: user=<patman>, method=PLAIN, rip=192.168.1.4, lip=192.168.1.1, mpid=8479, TLS, session=<PnHKYLf2SrDAqAEE> Mar 12 10:32:27 goffin dovecot[8269]: imap(patman)<8452><r+ynYLf2PrDAqAEE>: Panic: file istream-header-filter.c: line 663 (i_stream_header_filter_snapshot_free): assertion failed: (snapshot->mstream->snapshot_pending) Mar 12 10:32:27 goffin audit[8452]: ANOM_ABEND auid=4294967295 uid=1000 gid=1000 ses=4294967295 subj=kernel pid=8452 comm="imap" exe="/usr/libexec/dovecot/imap" sig=6 res=1 email client is fairemail version 1.2042a on android, but an older version had the same problem. I mainly use fairemail to read emails on my phone, and that is working fine but I noticed that deleted emails were not actually getting deleted, that it has a bunch of "pending operations" it has were not running, and that dovecot has been crashing like this since about feb 2 (over a month ago). I can't figure out what changed at that time, but my cert says it should have expired over a year ago, but the cert as created 26 months ago. log files only go back to Feb 5 so just missed that. I generated a new cert but it's still crashing (I probably still need to do something on the client side or my setup is broken). I assume there is something wrong or some "snapshot" thing that's stuck, but since it's crashing I can't figure out what the undelysing problem is. Thanks for any help. More details: -------------------------------------------------------------------------------- # dovecot --version 2.3.20 (80a5ac675d) Running with up to date fedora core 37. -------------------------------------------------------------------------------- # dovecot -n # 2.3.20 (80a5ac675d): /etc/dovecot/dovecot.conf # OS: Linux 6.1.15-200.fc37.x86_64 x86_64 Fedora release 37 (Thirty Seven) # Hostname: specu mail_location = mbox:~/Mail:INBOX=~/Mail/inbox mbox_write_locks = fcntl 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 { driver = pam } ssl = required ssl_cert = </etc/pki/dovecot/certs/dovecot.pem ssl_cipher_list = PROFILE=SYSTEM ssl_key = # hidden, use -P to show it userdb { driver = passwd } -------------------------------------------------------------------------------- gdb backtrace via coredumpctl debug PID: Core was generated by `dovecot/imap'. Program terminated with signal SIGABRT, Aborted. --Type <RET> for more, q to quit, c to continue without paging-- #0 __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at pthread_kill.c:44 44 return INTERNAL_SYSCALL_ERROR_P (ret) ? INTERNAL_SYSCALL_ERRNO (ret) : 0; (gdb) bt #0 __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at pthread_kill.c:44 #1 0x00007fa3840afec3 in __pthread_kill_internal (signo=6, threadid=<optimized out>) at pthread_kill.c:78 #2 0x00007fa38405fa76 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26 #3 0x00007fa3840497fc in __GI_abort () at abort.c:79 #4 0x00007fa3847541e3 in default_fatal_finish (status=0, type=LOG_TYPE_PANIC) at ../lib/failures.c:465 #5 fatal_handler_real (ctx=<optimized out>, format=<optimized out>, args=<optimized out>) at ../lib/failures.c:477 #6 0x00007fa3847ff5f7 in i_internal_fatal_handler (ctx=<optimized out>, format=<optimized out>, args=<optimized out>) at ../lib/failures.c:879 #7 0x00007fa3847540e1 in i_panic (format=0x7fa384844040 "file %s: line %d (%s): assertion failed: (%s)") at ../lib/failures.c:530 #8 0x00007fa38474fdf8 in i_stream_header_filter_snapshot_free (_snapshot=<optimized out>) at ../lib-mail/istream-header-filter.c:663 #9 i_stream_header_filter_snapshot_free (_snapshot=0x56150ea92250) at ../lib-mail/istream-header-filter.c:655 #10 0x00007fa38480cb6c in i_stream_snapshot_free (_snapshot=_snapshot@entry=0x56150ea9d2a0) at ../lib/istream.c:253 #11 0x00007fa38480cc14 in i_stream_unref (stream=0x56150ea9d338) at ../lib/istream.c:66 #12 0x00007fa3847dd179 in message_parse_header_deinit (_ctx=_ctx@entry=0x56150ea9d0c8) at ../lib-mail/message-header-parser.c:52 #13 0x00007fa3847deea1 in preparsed_parse_next_header (ctx=0x56150ea9d050, block_r=0x7ffc8222ca70) at ../lib-mail/message-parser-from-parts.c:310 #14 0x00007fa3847dfedc in message_parser_parse_next_block (ctx=ctx@entry=0x56150ea9d050, block_r=block_r@entry=0x7ffc8222ca70) at ../lib-mail/message-parser.c:838 #15 0x00007fa3847e0029 in message_parser_parse_header (ctx=0x56150ea9d050, hdr_size=hdr_size@entry=0x56150ea5ff00, callback=callback@entry=0x7fa3849aa3f0 <index_mail_parse_part_header_cb>, context=context@entry=0x56150ea5fc78) at ../lib-mail/message-parser.c:877 #16 0x00007fa3849aa60a in index_mail_parse_headers_internal (mail=mail@entry=0x56150ea5fc78, headers=headers@entry=0x0) at index/index-mail-headers.c:465 #17 0x00007fa3849aa71e in index_mail_parse_headers (mail=0x56150ea5fc78, headers=0x0, reason=<optimized out>) at index/index-mail-headers.c:499 #18 0x00007fa3849b021e in index_mail_parse_bodystructure_full (mail=0x56150ea5fc78, field=MAIL_CACHE_IMAP_BODYSTRUCTURE) at index/index-mail.c:1491 #19 0x00007fa3849b02b3 in index_mail_parse_bodystructure (mail=mail@entry=0x56150ea5fc78, field=field@entry=MAIL_CACHE_IMAP_BODYSTRUCTURE) at index/index-mail.c:1515 #20 0x00007fa3849b06cd in index_mail_get_special (_mail=0x56150ea5fc78, field=<optimized out>, value_r=0x7ffc8222cbe0) at index/index-mail.c:1713 #21 0x00007fa38492fa1e in mail_get_special (mail=<optimized out>, field=field@entry=MAIL_FETCH_IMAP_BODYSTRUCTURE, value_r=value_r@entry=0x7ffc8222cbe0) at /usr/src/debug/dovecot-2.3.20-1.fc37.x86_64/src/lib-storage/mail.c:418 #22 0x000056150dcf458c in fetch_bodystructure (ctx=0x56150ea57530, mail=<optimized out>, context=<optimized out>) at /usr/src/debug/dovecot-2.3.20-1.fc37.x86_64/src/imap/imap-fetch.c:740 #23 0x000056150dcfa3f3 in imap_fetch_more_int (ctx=ctx@entry=0x56150ea57530, cancel=false) at /usr/src/debug/dovecot-2.3.20-1.fc37.x86_64/src/imap/imap-fetch.c:562 #24 0x000056150dcfa6cd in imap_fetch_more (ctx=0x56150ea57530, cmd=0x56150ea57368) at /usr/src/debug/dovecot-2.3.20-1.fc37.x86_64/src/imap/imap-fetch.c:617 #25 0x000056150dceed11 in cmd_fetch (cmd=0x56150ea57368) at /usr/src/debug/dovecot-2.3.20-1.fc37.x86_64/src/imap/cmd-fetch.c:382 #26 0x000056150dcf79a5 in command_exec (cmd=cmd@entry=0x56150ea57368) at /usr/src/debug/dovecot-2.3.20-1.fc37.x86_64/src/imap/imap-commands.c:201 #27 0x000056150dcfd712 in client_command_input (cmd=<optimized out>, cmd@entry=0x56150ea57368) at /usr/src/debug/dovecot-2.3.20-1.fc37.x86_64/src/imap/imap-client.c:1232 #28 0x000056150dcfd7b8 in client_command_input (cmd=<optimized out>) at /usr/src/debug/dovecot-2.3.20-1.fc37.x86_64/src/imap/imap-client.c:1302 #29 0x000056150dcfdc05 in client_handle_next_command (remove_io_r=<synthetic pointer>, client=0x56150ea567f8) at /usr/src/debug/dovecot-2.3.20-1.fc37.x86_64/src/imap/imap-client.c:1344 #30 client_handle_input (client=client@entry=0x56150ea567f8) at /usr/src/debug/dovecot-2.3.20-1.fc37.x86_64/src/imap/imap-client.c:1358 #31 0x000056150dcfdfd4 in client_input (client=0x56150ea567f8) at /usr/src/debug/dovecot-2.3.20-1.fc37.x86_64/src/imap/imap-client.c:1402 #32 0x00007fa3848183ad in io_loop_call_io (io=0x56150ea890b0) at ../lib/ioloop.c:737 #33 0x00007fa38481973a in io_loop_handler_run_internal (ioloop=ioloop@entry=0x56150ea2def0) at ../lib/ioloop-epoll.c:222 #34 0x00007fa3848197e4 in io_loop_handler_run (ioloop=ioloop@entry=0x56150ea2def0) at ../lib/ioloop.c:789 #35 0x00007fa3848199a0 in io_loop_run (ioloop=0x56150ea2def0) at ../lib/ioloop.c:762 #36 0x00007fa384788bf7 in master_service_run (service=0x56150ea2dd40, callback=callback@entry=0x56150dd00ae0 <client_connected>) at ../lib-master/master-service.c:869 #37 0x000056150dce9c4d in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/dovecot-2.3.20-1.fc37.x86_64/src/imap/main.c:566 (gdb)

3 6

Option to disable client-initiated renegotiation
by Serg 13 Mar '23

13 Mar '23

Hello, is there any way to disallow client-initiated renegotiation at the dovecot? I haven't found any mention of this feature within source code as well as at the documentation. I am asking about it because without this feature mail server is vulnerable to a TLS renegotiation DoS attack which can consume a lot of CPU and is harder to combat comparing to a basic TLS connections flood.

2 1

bug: usersfile very weird behaviour regarding path to mbox
by Mikel Pérez 13 Mar '23

13 Mar '23

dovecot --version 2.3.20 (80a5ac675d) having the following setup: (1) aioria:/srv/franper/mail # cat /etc/dovecot/users ***snip*** ventas-respaldo@franper.net:*snip*:1001:1000::/srv/franper/mail/ventas (2) aioria:/srv/franper/mail # ls -lha total 0 drwxr-x---. 1 1001 1000 238 Mar 13 05:07 . drwxr-sr-x. 1 1000 1001 62 Oct 24 21:29 .. ***snip*** drwxr-x---. 1 1001 1000 578 Mar 4 18:53 ventas drwx------. 1 1001 1000 246 Mar 13 05:07 ventas-respaldo (3) aioria:/srv/franper/mail # date -u Mon Mar 13 05:09:06 UTC 2023 where (1) I'm trying to expose the contents of the mbox ventas as ventas-respaldo(a)franper.net, well, for some reason it disregards that I'm pointing at /srv/franper/mail/ventas BUT does take the directory path at /srv/franper/mail and then constructs a /srv/franper/mail/ventas-respaldo path, which you can confirm with (2) showing ventas-respaldo modification date being today's date (3) because a client (Thunderbird 103 if you're interested but I think that it's not its fault at all) tried accessing ventas-respaldo(a)franper.net which should have pointed to /srv/franper/mail/ventas but instead did this very weird thing. Nowhere in /etc/dovecot/users do I have a line pointing to /srv/franper/mail/ventas-respaldo. dovecut just generates it somehow. dovecot -n: # 2.3.20 (80a5ac675d): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.20 (149edcf2) # OS: Linux 6.2.1-1-default x86_64 ## (OpenSUSE micro OS) # Hostname: aioria disable_plaintext_auth = no mail_location = maildir:/srv/franper/mail/%n managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables b ody enotify environment mailbox date index ihave duplicate mime foreverypart extracttext 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 = scheme=CRYPT username_format=%u /etc/dovecot/users driver = passwd-file } plugin { sieve = file:~/sieve;active=~/.dovecot.sieve } ssl = required ssl_cert = <*snip* ssl_cipher_list = ALL:!DH:!kRSA:!SRP:!kDHd:!DSS:!aNULL:!eNULL:!EXPORT:!DES:!3DES:!MD5:!PSK:!RC4:!ADH:!LOW@STRENGTH ssl_key = # hidden, use -P to show it ssl_options = no_compression ssl_prefer_server_ciphers = yes userdb { args = username_format=%u /etc/dovecot/users driver = passwd-file } tell me if you need the sysreport tar and big thanks

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set imap flags in user sieve scripts
by spi 11 Mar '23

11 Mar '23

Hi all Could anyone lead me into the right direction please? I use 'addflag ...' or 'fileinto :flags ...' in global sieve scripts to flag and sort incoming mail - that works. Trying to do that with custom user scripts doesn't work - I get the error that imap4flags only can be used in global scripts. Is there any way to get incoming mails labled and sorted by user sieve scripts? So something like this for a particular user doesn't work: if address :domain "From" "whatever.com"{ fileinto :flags ["\\todo"] "working/whatever"; } -- Cheers spi

3 4

Inconsistent filtering with debugging
by Christian Wolf 11 Mar '23

11 Mar '23

Hello, I have the problem, that I have a Postfix/Dovecot combination running with Sieve activated. The sieve script is running in general as some messages get filtered and moved to the appropriate folders. Now, I see that for the envelope filter, the behavior differs depending if I am debugging the rules or if the mails are received in a regular way. I have something like this: require "envelope"; # ... if envelope :is "to" "foo(a)subdaomin.example.com" { fileinto "INBOX.bar"; stop; } # ... The thing is if I call sieve-filter on the INBOX, I get the information that the mail is to be moved to the appropriate folder. However during delivery the mail is not moved there. Other rules in the script are working so it is installed in general. Of course, I could send mails to the mail address for testing but I have no clue on where to look for issues, especially as the "main debugging tool" for the rules (sieve-filter) is strangely behaving differently. The reason, I wanted to use the envelope was because the mails are delivered to foo(a)subdomain.example.com. From there, some virtual aliases are forwarded to a cental account bar(a)example.net using postfix virtual aliases. Thus, the Delivered-To header is always showing the value bar(a)example.net which is not suited for filtering. I could filter the Received headers but hoped for a more "high level" solution. Can you give me any advice? Christian

3 3

Winbind auhentication
by Luciano Mannucci 10 Mar '23

10 Mar '23

Helo all! I'm trying to set up a dovecot server so that it authenticates local user via /etc/passwd (I'm on a Freebsd 13.1) and via winbindd for those that it cannot find localy. The samba suite is alive and well, postfix gets happily mail from domain users and saves it with correct name and permissions from the windows domain. If I try to authenticate a domain user via wbinfo it works, with dovecot it doesn't. I guess I'v forgot something in the dovecot config... :) Here is my doveconf -n: # 2.3.20 (80a5ac675d): /usr/local/etc/dovecot/dovecot.conf # Pigeonhole version 0.5.20 (149edcf2) # OS: FreeBSD 13.1-RELEASE-p5 powerpc ufs # Hostname: numeron.mcs.it auth_cache_size = 30 k auth_debug_passwords = yes auth_mechanisms = plain ntlm login auth_use_winbind = yes auth_username_format = %n auth_winbind_helper_path = /usr/local/bin/ntlm_auth default_client_limit = 1128 default_vsz_limit = 712 M disable_plaintext_auth = no first_valid_uid = 0 info_log_path = /var/log/dovecot/logfile.info listen = * lock_method = flock log_path = /var/log/dovecot/logfile login_greeting = Dovecot at Nameron Ready. mail_location = mbox:/var/spool/dovecot/%u:INBOX=/var/mail/%u mail_plugins = fts 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 index ihave duplicate mime foreverypart extracttext passdb { driver = passwd } protocols = imap pop3 service replication-notify-fifo { name = aggregator } service anvil-auth-penalty { name = anvil } service auth-worker { name = auth-worker } service auth-client { user = root name = auth } service config { name = config } service dict-async { name = dict-async } service dict { name = dict } service login/proxy-notify { name = director } service dns-client { name = dns-client } service doveadm-server { name = doveadm } service imap-hibernate { name = imap-hibernate } service imap { service_count = 0 name = imap-login } service imap-urlauth { name = imap-urlauth-login } service imap-urlauth-worker { name = imap-urlauth-worker } service token-login/imap-urlauth { name = imap-urlauth } service imap-master { name = imap } service indexer-worker { name = indexer-worker } service indexer { name = indexer } service ipc { name = ipc } service lmtp { name = lmtp } service log-errors { name = log } service sieve { name = managesieve-login } service login/sieve { name = managesieve } service old-stats-mail { name = old-stats } service pop3 { process_limit = 255 service_count = 1 name = pop3-login } service login/pop3 { name = pop3 } service replicator-doveadm { name = replicator } service login/stats-writer { unix_listener { group = mail mode = 0666 user = dovecot path = stats-reader } unix_listener { group = mail mode = 0666 user = dovecot path = stats-writer } name = stats } service submission { name = submission-login } service login/submission { name = submission } ssl = no userdb { driver = passwd } protocol pop3 { pop3_client_workarounds = outlook-no-nuls oe-ns-eoh pop3_enable_last = yes pop3_uidl_format = %08Xu%08Xv service replication-notify-fifo { name = aggregator } service anvil-auth-penalty { name = anvil } service auth-worker { name = auth-worker } service auth-client { name = auth } service config { name = config } service dict-async { name = dict-async } service dict { name = dict } service login/proxy-notify { name = director } service dns-client { name = dns-client } service doveadm-server { name = doveadm } service imap-hibernate { name = imap-hibernate } service imap { name = imap-login } service imap-urlauth { name = imap-urlauth-login } service imap-urlauth-worker { name = imap-urlauth-worker } service token-login/imap-urlauth { name = imap-urlauth } service imap-master { name = imap } service indexer-worker { name = indexer-worker } service indexer { name = indexer } service ipc { name = ipc } service lmtp { name = lmtp } service log-errors { name = log } service sieve { name = managesieve-login } service login/sieve { name = managesieve } service old-stats-mail { name = old-stats } service pop3 { name = pop3-login } service login/pop3 { name = pop3 } service replicator-doveadm { name = replicator } service login/stats-writer { name = stats } service submission { name = submission-login } service login/submission { name = submission } } protocol lda { debug_log_path = /var/log/dovecot/lda-debug.log info_log_path = /var/log/dovecot/lda.info log_path = /var/log/dovecot/lda.err mail_debug = yes postmaster_address = l(a)mcs.it service replication-notify-fifo { name = aggregator } service anvil-auth-penalty { name = anvil } service auth-worker { name = auth-worker } service auth-client { name = auth } service config { name = config } service dict-async { name = dict-async } service dict { name = dict } service login/proxy-notify { name = director } service dns-client { name = dns-client } service doveadm-server { name = doveadm } service imap-hibernate { name = imap-hibernate } service imap { name = imap-login } service imap-urlauth { name = imap-urlauth-login } service imap-urlauth-worker { name = imap-urlauth-worker } service token-login/imap-urlauth { name = imap-urlauth } service imap-master { name = imap } service indexer-worker { name = indexer-worker } service indexer { name = indexer } service ipc { name = ipc } service lmtp { name = lmtp } service log-errors { name = log } service sieve { name = managesieve-login } service login/sieve { name = managesieve } service old-stats-mail { name = old-stats } service pop3 { name = pop3-login } service login/pop3 { name = pop3 } service replicator-doveadm { name = replicator } service login/stats-writer { name = stats } service submission { name = submission-login } service login/submission { name = submission } } root@numeron:~# Thanks for any hint, Luciano. -- /"\ /Via A. Salaino, 7 - 20144 Milano (Italy) \ / ASCII RIBBON CAMPAIGN / PHONE : +39 02485781 FAX: +39 0248028247 X AGAINST HTML MAIL / E-MAIL: posthamster(a)sublink.sublink.ORG / \ AND POSTINGS / WWW: http://www.lesassaie.IT/

2 2

NFS and performances
by tomate aceite 10 Mar '23

10 Mar '23

Thanks!!!!

1 0