Authentication segfault with Dovecot 2.3.13
Harald Leithner
leithner at itronic.at
Wed Jan 6 19:22:03 EET 2021
Hi
Am 06.01.2021 um 18:08 schrieb Josef 'Jeff' Sipek:
> On Wed, Jan 06, 2021 at 17:13:05 +0100, Harald Leithner wrote:
>> Hi,
>>
>
>
>> 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.
yes
>
>> 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?
No
>
> Can you share your config? (`doveconf -n` will be a good start, any .ext
> files may be useful as well)
yes here is the dovecot -n
[root at mail:~]$ doveconf -n
# 2.3.13 (89f716dc2): /etc/dovecot/dovecot.conf
# OS: Linux 5.9.16-100.fc32.x86_64 x86_64 Generic release 32 (Generic)
# Hostname: xxxx
auth_cache_negative_ttl = 10 secs
auth_cache_size = 64 k
auth_cache_ttl = 30 secs
auth_mechanisms = CRAM-MD5 DIGEST-MD5 APOP LOGIN PLAIN
auth_username_chars =
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@%
auth_username_translation =
%@AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz
auth_worker_max_count = 150
disable_plaintext_auth = no
imap_capability = IMAP4 IMAP4rev1 ACL RIGHTS=texk NAMESPACE CHILDREN
SORT QUOTA THREAD=ORDEREDSUBJECT UNSELECT IDLE
login_greeting =
login_log_format_elements = user=<%u> %r %m %c %k
mail_max_userip_connections = 100
passdb {
args = /etc/dovecot/sql.conf
driver = sql
}
protocols = imap pop3
service anvil {
unix_listener anvil-auth-penalty {
mode = 00
}
}
service auth {
unix_listener /var/spool/postfix/private/auth {
group = postfix
mode = 0660
user = postfix
}
}
service imap-login {
client_limit = 300
inet_listener imap {
address = xx.xx.xx.xx
port = 143
}
inet_listener imaps {
address = xx.xx.xx.xx
port = 993
}
process_limit = 15
process_min_avail = 1
service_count = 0
vsz_limit = 512 M
}
service pop3-login {
client_limit = 300
inet_listener pop3 {
address = xx.xx.xx.xx
port = 110
}
inet_listener pop3s {
address = xx.xx.xx.xx
port = 995
}
process_limit = 15
process_min_avail = 1
service_count = 0
vsz_limit = 512 M
}
service stats {
client_limit = 10000
}
shutdown_clients = no
ssl_alt_cert = </var/lib/letsencrypt-wildcard/ecdsa.pem
ssl_alt_key = # hidden, use -P to show it
ssl_cert = </var/lib/letsencrypt-wildcard/rsa.pem
ssl_cipher_list =
ECDHE-RSA-CHACHA20-POLY1305:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA:AES256-SHA
ssl_dh = # hidden, use -P to show it
ssl_key = # hidden, use -P to show it
ssl_options = no_compression
ssl_prefer_server_ciphers = yes
userdb {
args = static uid=5000 gid=5000 home=/dev/null
driver = static
}
version_ignore = yes
[root at mail:~]$
>
> Thanks,
>
> Jeff.
thx
Harald
>
>> 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
>
>
>
>
>
--
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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