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Old 09-03-2009, 07:10 PM   #1
Johnomal
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Registered: Aug 2009
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Authentication failure after change to cracklib


Hi,

I was messing around with changing the dictionary for our PAM cracklib module and seemed to have stuffed something up.

When I attempt to log in through a telnet session with any user that has a password I get

Authentication Failure

This session is no longer connected

I am still able to log in via the Web admin using the root user/password.

I can also log in from a telnet session if the user has no password.

Any suggestions on how to fix this would be greatly appreciated.


John
 
Old 09-03-2009, 08:30 PM   #2
kbp
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Hi johnomal,

Not sure what platform you're running on but if its rpm based you could try:

Code:
rpm -Vv cracklib
rpm -Vv cracklib-dicts
Example output:
Code:
[root@xxxxx ~]# rpm -Vv cracklib-dicts
.........    /usr/lib/cracklib_dict.hwm
.........    /usr/lib/cracklib_dict.pwd
.........    /usr/lib/cracklib_dict.pwi
.........    /usr/sbin/mkdict
.........    /usr/sbin/packer
.........    /usr/share/cracklib
.........    /usr/share/cracklib/cracklib-small.hwm
.........    /usr/share/cracklib/cracklib-small.pwd
.........    /usr/share/cracklib/cracklib-small.pwi
.........    /usr/share/cracklib/pw_dict.hwm
.........    /usr/share/cracklib/pw_dict.pwd
.........    /usr/share/cracklib/pw_dict.pwi
If there is anything other than dots then you'll need to fix that particular file

You could also force reinstallation if any files are deleted

cheers,

kbp

Last edited by kbp; 09-03-2009 at 08:32 PM.
 
Old 09-03-2009, 09:00 PM   #3
Johnomal
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Thanks for that info.

Here is the output of

rmp -Vv cracklib-dicts

..5....T /usr/lib/cracklib_dict.hwm
S.5....T /usr/lib/cracklib_dict.pwd
S.5....T /usr/lib/cracklib_dict.pwi
........ /usr/sbin/mkdict
........ /usr/sbin/packer

I guess that means I will have to fix some files.

My system is Redhat Enterprise release 4.

Can you tell me what steps I need to take to repair those files?

Thanks,
John

Quote:
Originally Posted by kbp View Post
Hi johnomal,

Not sure what platform you're running on but if its rpm based you could try:

Code:
rpm -Vv cracklib
rpm -Vv cracklib-dicts
Example output:
Code:
[root@xxxxx ~]# rpm -Vv cracklib-dicts
.........    /usr/lib/cracklib_dict.hwm
.........    /usr/lib/cracklib_dict.pwd
.........    /usr/lib/cracklib_dict.pwi
.........    /usr/sbin/mkdict
.........    /usr/sbin/packer
.........    /usr/share/cracklib
.........    /usr/share/cracklib/cracklib-small.hwm
.........    /usr/share/cracklib/cracklib-small.pwd
.........    /usr/share/cracklib/cracklib-small.pwi
.........    /usr/share/cracklib/pw_dict.hwm
.........    /usr/share/cracklib/pw_dict.pwd
.........    /usr/share/cracklib/pw_dict.pwi
If there is anything other than dots then you'll need to fix that particular file

You could also force reinstallation if any files are deleted

cheers,

kbp
 
Old 09-03-2009, 11:46 PM   #4
kbp
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Hey John,

You can obtain the rpm from rhel4 media or channels and just reinstall it:

Code:
rpm -ivh --force cracklib-dicts-x.x.x.arch.rpm
cheers

kbp
 
Old 09-07-2009, 12:01 AM   #5
Johnomal
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Registered: Aug 2009
Posts: 6

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Thanks again,

I reinstalled the cracklib and cracklib-dicts packages, it fixed up the entries in that file.

But I still have the original problem. Any user that requires a password to log in gets 'Authentication failure'.

My production box is still working fine.

Is there anything I can compare between the 2 boxes to work out what is different?

Is there anything else I can do to resolve the problem?

John
 
Old 09-07-2009, 12:49 AM   #6
kbp
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Did you modify /etc/pam.d/system-auth ? ... try comparing the contents of /etc/pam.d

cheers
 
Old 09-07-2009, 01:11 AM   #7
Johnomal
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Yep, tried that.

Copied the file over from the production box and still the same result.
 
  


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