Authentication segfault with Dovecot 2.3.13
Josef 'Jeff' Sipek
jeff.sipek at open-xchange.com
Wed Jan 6 19:08:08 EET 2021
On Wed, Jan 06, 2021 at 17:13:05 +0100, Harald Leithner wrote:
> Hi,
>
> we have a problem upgrading Dovecot from 2.2 to 2.3.13 on one server it
> seems one user triggers a segfault while trying to authenticate.
>
> The user works fine with 2.2.36.4, our last update try mid-late 2020 was
> aborted because of this reason.
>
> While debugging the problem we noticed that the "auth_debug_passwords =
> no" option doesn't work at least in our logfiles are the passwords
> logged. We replaced the password in the log with
> "THIS_SHOULD_NOT_GET_LOGGED"
It should. It looks like on of the places in the code (specifically the
"cache hit" message) has password hiding code that's buggy/incomplete.
> and the user part with "user at redacted".
I assume you did this for additional privacy, and not because you think that
auth_debug_passwords=no should hide usernames as well.
> The user uses APOP for authentication, but other users login
> successfully with APOP.
Do you only use APOP? Or are other authentication schemes affected as well?
Can you share your config? (`doveconf -n` will be a good start, any .ext
files may be useful as well)
Thanks,
Jeff.
> Here is a stacktrace and a log dump:
>
> Jan 6 16:29:44 mail kernel: auth[2208397]: segfault at ec ip
> 00007f67fc147174 sp 00007ffeed993150 error 4 in
> libdovecot.so.0.0.0[7f67fc06e000+fc000]
> Jan 6 16:29:44 mail kernel: Code: 1f 80 00 00 00 00 41 54 e8 79 fd ff
> ff 31 f6 49 89 c4 48 89 c7 31 c0 e8 ca f8 ff ff 4c 89 e0 41 5c c3 0f 1f
> 40 00 53 48 89 fb <f6> 87 ec 00 00 00 04 75 43 48 83 3d 7b aa 0a 00 00
> 0f 85 50 15 f4
> Jan 6 16:29:44 mail systemd[1]: Started Process Core Dump (PID
> 2208677/UID 0).
> Jan 6 16:29:44 mail systemd-coredump[2208678]: Process 2208397 (auth)
> of user 489 dumped core.#012#012Stack trace of thread 2208397:#012#0
> 0x00007f67fc147174 event_create_passthrough (libdovecot.so.0 +
> 0x116174)#012#1 0x0000555678812d6e auth_request_finished_event (auth +
> 0x1bd6e)#012#2 0x00005556788159ae auth_request_log_finished (auth +
> 0x1e9ae)#012#3 0x0000555678816ee0 n/a (auth + 0x1fee0)#012#4
> 0x0000555678826dc1 passdb_handle_credentials (auth + 0x2fdc1)#012#5
> 0x0000555678816c7e n/a (auth + 0x1fc7e)#012#6 0x0000555678824f27 n/a
> (auth + 0x2df27)#012#7 0x000055567881b02d
> auth_request_handler_auth_begin (auth + 0x2402d)#012#8
> 0x000055567880dfaf n/a (auth + 0x16faf)#012#9 0x00007f67fc143a79
> io_loop_call_io (libdovecot.so.0 + 0x112a79)#012#10 0x00007f67fc144ae2
> io_loop_handler_run_internal (libdovecot.so.0 + 0x113ae2)#012#11
> 0x00007f67fc143b21 io_loop_handler_run (libdovecot.so.0 +
> 0x112b21)#012#12 0x00007f67fc143ce0 io_loop_run (libdovecot.so.0 +
> 0x112ce0)#012#13 0x00007f67fc0b96f3 master_service_run (libdovecot.so.0
> + 0x886f3)#012#14 0x000055567880c2db main (auth + 0x152db)#012#15
> 0x00007f67fbc9d042 __libc_start_main (libc.so.6 + 0x27042)#012#16
> 0x000055567880c48e _start (auth + 0x1548e)
>
> Jan 6 16:29:44 mail dovecot[2208071]: auth: Debug: client in:
> AUTH#011134#011PLAIN#011service=imap#011session=tgog/jy4erm5j7ZO#011lip=lan-ip#011rip=client-ip#011lport=143#011rport=47482
> Jan 6 16:29:44 mail dovecot[2208071]: auth: Debug: client passdb out:
> CONT#011134
> Jan 6 16:29:44 mail dovecot[2208071]: auth: Debug: client in: CONT<hidden>
> Jan 6 16:29:44 mail dovecot[2208071]: auth: Debug:
> sql(user at redacted,client-ip,<tgog/jy4erm5j7ZO>): Performing passdb lookup
> Jan 6 16:29:44 mail dovecot[2208071]: auth: Debug:
> sql(user at redacted,client-ip,<tgog/jy4erm5j7ZO>): cache expired
> Jan 6 16:29:44 mail dovecot[2208071]: auth-worker(2208404): Debug: conn
> unix:auth-worker (pid=2208397,uid=489): auth-worker<229>: Handling PASSV
> request
> Jan 6 16:29:44 mail dovecot[2208071]: auth-worker(2208404): Debug: conn
> unix:auth-worker (pid=2208397,uid=489): auth-worker<229>:
> sql(user at redacted,client-ip,<tgog/jy4erm5j7ZO>): Performing passdb lookup
> Jan 6 16:29:44 mail dovecot[2208071]: auth-worker(2208404): Debug: conn
> unix:auth-worker (pid=2208397,uid=489): auth-worker<229>:
> sql(user at redacted,client-ip,<tgog/jy4erm5j7ZO>): query: SELECT passwd as
> password, '127.0.0.1' as host, userid as destuser, passwd AS pass, 'Y'
> AS nologin, 'Y' AS nodelay, 'Y' AS proxy FROM dbmail_users WHERE
> userid='user at redacted' UNION (SELECT password as password, '127.0.0.1'
> as host, username as destuser, password AS pass, 'Y' AS nologin, 'Y' AS
> nodelay, 'Y' AS proxy FROM sasl_fake_auth WHERE
> username='user at redacted') limit 1;
> Jan 6 16:29:44 mail dovecot[2208071]: auth-worker(2208404): conn
> unix:auth-worker (pid=2208397,uid=489): auth-worker<229>:
> sql(user at redacted,client-ip,<tgog/jy4erm5j7ZO>): Password mismatch
> Jan 6 16:29:44 mail dovecot[2208071]: auth-worker(2208404): Debug: conn
> unix:auth-worker (pid=2208397,uid=489): auth-worker<229>:
> sql(user at redacted,client-ip,<tgog/jy4erm5j7ZO>): Finished passdb lookup
> Jan 6 16:29:44 mail dovecot[2208071]: auth-worker(2208404): Debug: conn
> unix:auth-worker (pid=2208397,uid=489): auth-worker<229>: Finished
> Jan 6 16:29:44 mail dovecot[2208071]: auth: Debug:
> sql(user at redacted,client-ip,<tgog/jy4erm5j7ZO>): Finished passdb lookup
> Jan 6 16:29:44 mail dovecot[2208071]: auth: Debug:
> auth(user at redacted,client-ip,<tgog/jy4erm5j7ZO>): Auth request finished
> Jan 6 16:29:44 mail dovecot[2208071]: auth: Debug: client in:
> AUTH#011443#011APOP#011service=pop3#011secured=tls#011session=n58h/jy4a0i5j7ZO#011lip=lan-ip#011rip=client-ip#011lport=995#011rport=18539#011local_name=mail#011resp=<hidden>
> Jan 6 16:29:44 mail dovecot[2208071]: auth: Debug:
> sql(user at redacted,client-ip,<n58h/jy4a0i5j7ZO>): Performing passdb lookup
> Jan 6 16:29:44 mail dovecot[2208071]: auth: Debug:
> sql(user at redacted,client-ip,<n58h/jy4a0i5j7ZO>): cache hit:
> <hidden>#011host=127.0.0.1#011destuser=user at redacted#011pass=THIS_SHOULD_NOT_GET_LOGGED#011nologin=Y#011nodelay=Y#011proxy=Y
> Jan 6 16:29:44 mail dovecot[2208071]: auth: Debug:
> sql(user at redacted,client-ip,<n58h/jy4a0i5j7ZO>): Finished passdb lookup
> Jan 6 16:29:44 mail dovecot[2208071]: auth: Debug:
> auth(user at redacted,client-ip,<n58h/jy4a0i5j7ZO>): Auth request finished
> Jan 6 16:29:44 mail dovecot[2208071]: auth: Debug: client passdb out:
> FAIL#011443#011user=user at redacted#011nodelay#011pass=<hidden>#011nodelay=Y
> Jan 6 16:29:44 mail dovecot[2208071]: pop3-login: Debug: Ignoring
> unknown passdb extra field: nodelay
> Jan 6 16:29:44 mail dovecot[2208071]: pop3-login: Debug: Ignoring
> unknown passdb extra field: nodelay
> Jan 6 16:29:44 mail dovecot[2208071]: pop3-login: Disconnected (auth
> failed, 1 attempts in 0 secs): user=<user at redacted>, client-ip, APOP,
> TLS, TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
> Jan 6 16:29:44 mail dovecot[2208071]: auth-worker(2208404): Debug: conn
> unix:auth-worker (pid=2208397,uid=489): Disconnected: Connection closed
> (fd=-1)
> Jan 6 16:29:44 mail dovecot[2208071]: auth: Fatal: master:
> service(auth): child 2208397 killed with signal 11 (core
> dumped)h-worker<1>: Handling PASSV request
>
> Jan 6 16:20:05 mail dovecot[2208071]: auth: Debug: client in:
> AUTH#01179#011PLAIN#011service=imap#011session=QY6V2zy4FUm5j7YD#011lip=lan-ip#011rip=client-ip#011lport=143#011rport=18709
> Jan 6 16:20:05 mail dovecot[2208071]: auth: Debug: client passdb out:
> CONT#01179
> Jan 6 16:20:05 mail dovecot[2208071]: auth: Debug: client in: CONT<hidden>
> Jan 6 16:20:05 mail dovecot[2208071]: auth: Debug:
> sql(user at redacted,client-ip,<QY6V2zy4FUm5j7YD>): Performing passdb lookup
> Jan 6 16:20:05 mail dovecot[2208071]: auth: Debug:
> sql(user at redacted,client-ip,<QY6V2zy4FUm5j7YD>): cache expired
> Jan 6 16:20:05 mail dovecot[2208071]: auth-worker(2208083): Debug: conn
> unix:auth-worker (pid=2208074,uid=489): auth-worker<235>: Handling PASSV
> request
> Jan 6 16:20:05 mail dovecot[2208071]: auth-worker(2208083): Debug: conn
> unix:auth-worker (pid=2208074,uid=489): auth-worker<235>:
> sql(user at redacted,client-ip,<QY6V2zy4FUm5j7YD>): Performing passdb lookup
> Jan 6 16:20:05 mail dovecot[2208071]: auth-worker(2208083): Debug: conn
> unix:auth-worker (pid=2208074,uid=489): auth-worker<235>:
> sql(user at redacted,client-ip,<QY6V2zy4FUm5j7YD>): query: SELECT passwd as
> password, '127.0.0.1' as host, userid as destuser, passwd AS pass, 'Y'
> AS nologin, 'Y' AS nodelay, 'Y' AS proxy FROM dbmail_users WHERE
> userid='user at redacted' UNION (SELECT password as password, '127.0.0.1'
> as host, username as destuser, password AS pass, 'Y' AS nologin, 'Y' AS
> nodelay, 'Y' AS proxy FROM sasl_fake_auth WHERE
> username='user at redacted') limit 1;
> Jan 6 16:20:05 mail dovecot[2208071]: auth-worker(2208083): conn
> unix:auth-worker (pid=2208074,uid=489): auth-worker<235>:
> sql(user at redacted,client-ip,<QY6V2zy4FUm5j7YD>): Password mismatch
> Jan 6 16:20:05 mail dovecot[2208071]: auth-worker(2208083): Debug: conn
> unix:auth-worker (pid=2208074,uid=489): auth-worker<235>:
> sql(user at redacted,client-ip,<QY6V2zy4FUm5j7YD>): Finished passdb lookup
> Jan 6 16:20:05 mail dovecot[2208071]: auth-worker(2208083): Debug: conn
> unix:auth-worker (pid=2208074,uid=489): auth-worker<235>: Finished
> Jan 6 16:20:05 mail dovecot[2208071]: auth: Debug:
> sql(user at redacted,client-ip,<QY6V2zy4FUm5j7YD>): Finished passdb lookup
> Jan 6 16:20:05 mail dovecot[2208071]: auth: Debug:
> auth(user at redacted,client-ip,<QY6V2zy4FUm5j7YD>): Auth request finished
> Jan 6 16:20:05 mail dovecot[2208071]: auth: Debug: client in:
> AUTH#011215#011APOP#011service=pop3#011secured=tls#011session=ZJWX2zy4VzO5j7YD#011lip=lan-ip#011rip=client-ip#011lport=995#011rport=13143#011local_name=mail#011resp=<hidden>
> Jan 6 16:20:05 mail dovecot[2208071]: auth: Debug:
> sql(user at redacted,client-ip,<ZJWX2zy4VzO5j7YD>): Performing passdb lookup
> Jan 6 16:20:05 mail dovecot[2208071]: auth: Debug:
> sql(user at redacted,client-ip,<ZJWX2zy4VzO5j7YD>): cache hit:
> <hidden>#011host=127.0.0.1#011destuser=user at redacted#011pass=THIS_SHOULD_NOT_GET_LOGGED#011nologin=Y#011nodelay=Y#011proxy=Y
> Jan 6 16:20:05 mail dovecot[2208071]: auth: Debug:
> sql(user at redacted,client-ip,<ZJWX2zy4VzO5j7YD>): Finished passdb lookup
> Jan 6 16:20:05 mail dovecot[2208071]: auth: Debug:
> auth(user at redacted,client-ip,<ZJWX2zy4VzO5j7YD>): Auth request finished
> Jan 6 16:20:05 mail dovecot[2208071]: auth: Debug: client passdb out:
> FAIL#011215#011user=user at redacted#011nodelay#011pass=<hidden>#011nodelay=Y
> Jan 6 16:20:05 mail dovecot[2208071]: pop3-login: Debug: Ignoring
> unknown passdb extra field: nodelay
> Jan 6 16:20:05 mail dovecot[2208071]: pop3-login: Debug: Ignoring
> unknown passdb extra field: nodelay
> Jan 6 16:20:05 mail dovecot[2208071]: pop3-login: Disconnected (auth
> failed, 1 attempts in 0 secs): user=<user at redacted>, client-ip, APOP,
> TLS, TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
> Jan 6 16:20:05 mail dovecot[2208071]: auth-worker(2208083): Debug: conn
> unix:auth-worker (pid=2208074,uid=489): Disconnected: Connection closed
> (fd=-1)
> Jan 6 16:20:05 mail dovecot[2208071]: auth: Fatal: master:
> service(auth): child 2208074 killed with signal 11 (core dumped)
>
> Jan 6 16:20:20 mail dovecot[2208071]: auth: Debug: client in:
> AUTH#011218#011APOP#011service=pop3#011secured=tls#011session=wXyB3Dy4W0i5j7YD#011lip=lan-ip#011rip=client-ip#011lport=995#011rport=18523#011local_name=mail#011resp=<hidden>
> Jan 6 16:20:20 mail dovecot[2208071]: auth: Debug:
> sql(user at redacted,client-ip,<wXyB3Dy4W0i5j7YD>): Performing passdb lookup
> Jan 6 16:20:20 mail dovecot[2208071]: auth: Debug:
> sql(user at redacted,client-ip,<wXyB3Dy4W0i5j7YD>): cache hit:
> <hidden>#011host=127.0.0.1#011destuser=user at redacted#011pass=THIS_SHOULD_NOT_GET_LOGGED#011nologin=Y#011nodelay=Y#011proxy=Y
> Jan 6 16:20:20 mail dovecot[2208071]: auth: Debug:
> sql(user at redacted,client-ip,<wXyB3Dy4W0i5j7YD>): Finished passdb lookup
> Jan 6 16:20:20 mail dovecot[2208071]: auth: Debug:
> auth(user at redacted,client-ip,<wXyB3Dy4W0i5j7YD>): Auth request finished
> Jan 6 16:20:20 mail dovecot[2208071]: auth: Debug: client passdb out:
> FAIL#011218#011user=user at redacted#011nodelay#011pass=<hidden>#011nodelay=Y
> Jan 6 16:20:20 mail dovecot[2208071]: pop3-login: Debug: Ignoring
> unknown passdb extra field: nodelay
> Jan 6 16:20:20 mail dovecot[2208071]: pop3-login: Debug: Ignoring
> unknown passdb extra field: nodelay
> Jan 6 16:20:20 mail dovecot[2208071]: pop3-login: Disconnected (auth
> failed, 1 attempts in 0 secs): user=<user at redacted>, client-ip, APOP,
> TLS, TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
> Jan 6 16:20:20 mail dovecot[2208071]: auth-worker(2208392): Debug: conn
> unix:auth-worker (pid=2208385,uid=489): Disconnected: Connection closed
> (fd=-1)
> Jan 6 16:20:20 mail dovecot[2208071]: auth: Fatal: master:
> service(auth): child 2208385 killed with signal 11 (core dumped)
>
>
> Any help is appreciated thanks
>
> Harald
> --
> ITronic
>
> Harald Leithner
> Wiedner Hauptstraße 120/5.1, 1050 Wien, Austria
> Tel: +43-1-545 0 604
> Mobil: +43-699-123 78 4 78
> Mail: leithner at itronic.at | itronic.at
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