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MQSeries.net Forum IndexGeneral IBM MQ SupportMQ 9.1 PAM auth fails when password is too long

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skoesters
PostPosted: Tue Apr 09, 2019 6:25 am Post subject: MQ 9.1 PAM auth fails when password is too long Reply with quote

Acolyte

Joined: 08 Jun 2008
Posts: 73

Hi,

i set my MQ 9.1 QMGRs to use PAM for auth, to support local users as well als LDAP Users (The underlying OS - CentsOS 7 - is also using PAM).

For 4 out of 5 Users this is working fine.

log:

Code:
    pam_sss(ibmmq:auth): authentication success; logname= uid=1000 euid=0 tty= ruser= rhost= user=xxxxxx


For one User this is not working:

Code:
    amqoampx: pam_sss(ibmmq:auth): authentication failure; logname= uid=1000 euid=0 tty= ruser= rhost= user=yyyyyy
    amqoampx: pam_sss(ibmmq:auth): received for user yyyyyy: 17 (Failure setting user credentials)


I did some testing and figured out that the reason seems to be the password length of named user. When i use a shorter password (in this case a 11-digit password) it works fine. As soon as i use a longer password (tested with a 18-digit password) the error occurs.

fyi: The same password that is not working with mq, is working fine with ssh (also pam)

log:

Code:
    sshd[109243]: pam_sss(sshd:auth): authentication success; logname= uid=0 euid=0 tty=ssh ruser= rhost=xxx.xxx.xxx.xxx user=yyyyyy


so i had the idea to copy "/etc/pam.d/sshd" to "/etc/pam.d/ibmmq" to have the same settings as for ssh. Still i have the mq Problem with that one user.

Is there a way to fix this problem?

Thank you and best regards
Sebastian
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ankurlodhi
PostPosted: Tue Apr 09, 2019 6:39 am Post subject: Reply with quote

Master

Joined: 19 Oct 2010
Posts: 256

MQ has it's limit of 12 character for any username's password,anything more then 12 MQ starts throwing errors. related to authentication.

https://www.ibm.com/support/knowledgecenter/en/SSFKSJ_9.1.0/com.ibm.mq.ref.con.doc/q082110_.htm
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skoesters
PostPosted: Tue Apr 09, 2019 7:57 am Post subject: Reply with quote

Acolyte

Joined: 08 Jun 2008
Posts: 73

i did not know that. thanks!
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