[CentOS] saslauthd for sendmail SMTP relay

Bernd Bartmann bernd.bartmann at gmail.com
Sun May 25 13:20:10 UTC 2008


On Sun, May 25, 2008 at 2:42 PM, Ian Blackwell wrote:
> Bernd Bartmann wrote:
>>
>> Thanks Ian. That's indeed the reason. "service saslauthd status" gives
>> "saslauthd dead but subsys locked". Now, what could be the reason why
>> saslauthd was not running any more?
>
> Hard to say without seeing the logs.  Does it restart for you or is it
> continuing to fail?

It did start without any problems. Looks like I found the cause. From
the logs I see that someone tried a brute force attach on the SMTP
relay with several username / password combinations. Then one of the
attempts lead to a segfault of saslauth. Which probably means that
there is a bug in saslauthd as it should not be possible to crash a
service just by suppling a "weird" comibination of input data.

May 18 17:25:36 srsrzfw01 saslauthd[5167]: do_auth         : auth
failure: [user=marketing] [s
ervice=smtp] [realm=] [mech=shadow] [reason=Unknown]
May 18 17:25:37 srsrzfw01 kernel: saslauthd[5168]: segfault at
000000004ba33160 rip 000000323d
e76170 rsp 00007fff78d4fb18 error 4
May 18 17:25:37 srsrzfw01 kernel: saslauthd[5166]: segfault at
000000004ba33160 rip 000000323d
e76170 rsp 00007fff78d4fb18 error 4
May 18 17:25:37 srsrzfw01 kernel: saslauthd[5169]: segfault at
000000004ba33160 rip 000000323d
e76170 rsp 00007fff78d4fb18 error 4
May 18 17:25:38 srsrzfw01 kernel: saslauthd[5170]: segfault at
000000004ba33160 rip 000000323d
e76170 rsp 00007fff78d4fb18 error 4
May 18 17:25:38 srsrzfw01 kernel: saslauthd[5167]: segfault at
000000004ba33160 rip 000000323d
e76170 rsp 00007fff78d4fb18 error 4
May 22 18:29:53 srsrzfw01 saslauthd[26597]: detach_tty      : master
pid is: 26597
May 22 18:29:53 srsrzfw01 saslauthd[26597]: ipc_init        :
listening on socket: /var/run/sa
slauthd/mux
May 22 18:45:39 srsrzfw01 saslauthd[26597]: server_exit     : master
exited: 26597
May 22 18:47:31 srsrzfw01 saslauthd[5160]: detach_tty      : master pid is: 5160
May 22 18:47:31 srsrzfw01 saslauthd[5160]: ipc_init        : listening
on socket: /var/run/sas
lauthd/mux
May 22 18:57:24 srsrzfw01 saslauthd[5160]: server_exit     : master exited: 5160

cu,
Bernd



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