Authentication segfault with Dovecot 2.3.13
Harald Leithner
leithner at itronic.at
Wed Jan 6 18:13:05 EET 2021
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" and the user part with "user at redacted".
The user uses APOP for authentication, but other users login
successfully with APOP.
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
-------------- next part --------------
A non-text attachment was scrubbed...
Name: OpenPGP_0x473B935C49EA1B08.asc
Type: application/pgp-keys
Size: 3621 bytes
Desc: not available
URL: <https://dovecot.org/pipermail/dovecot/attachments/20210106/b6f27cf9/attachment-0001.bin>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: OpenPGP_signature
Type: application/pgp-signature
Size: 665 bytes
Desc: OpenPGP digital signature
URL: <https://dovecot.org/pipermail/dovecot/attachments/20210106/b6f27cf9/attachment-0001.sig>
More information about the dovecot
mailing list