[Freeipa-users] 'Preauthentication failed' with SSSD in ipa_server_mode

[Alexander Bokovoy]

On Tue, 24 Mar 2015, Bobby Prins wrote:
>>>The inability to login is reported in about the same time as the number of seconds you would find in the etime= field of the RESULT line.
>>>
>>>I checked the "Common AD provider issues" and "Troubleshooting authentication, password change and access control" sections on the SSSD Troubleshooting page. None of the issues reported there seem to be applicable in my situation.
>>>
>>>PAM logging on AIX:
>>>Mar 24 16:23:10 tst01 auth|security:debug /usr/sbin/getty PAM: pam_start(login bprins at example.corp)
>>>Mar 24 16:23:10 tst01 auth|security:debug /usr/sbin/getty PAM: pam_set_item(1)
>>>Mar 24 16:23:10 tst01 auth|security:debug /usr/sbin/getty PAM: pam_set_item(2)
>>>Mar 24 16:23:10 tst01 auth|security:debug /usr/sbin/getty PAM: pam_set_item(5)
>>>Mar 24 16:23:10 tst01 auth|security:debug /usr/sbin/getty PAM: pam_set_item(3)
>>>Mar 24 16:23:10 tst01 auth|security:debug /usr/sbin/getty PAM: pam_set_item(4)
>>>Mar 24 16:23:10 tst01 auth|security:debug /usr/sbin/getty PAM: pam_set_item(8)
>>>Mar 24 16:23:10 tst01 auth|security:debug /usr/sbin/getty PAM: pam_authenticate()
>>>Mar 24 16:23:10 tst01 auth|security:debug /usr/sbin/getty PAM: load_modules: /usr/lib/security/pam_aix
>>>Mar 24 16:23:10 tst01 auth|security:debug /usr/sbin/getty PAM: load_function: successful load of pam_sm_authenticate
>>>Mar 24 16:23:22 tst01 auth|security:debug /usr/sbin/getty PAM: pam_set_item(6)
>>>Mar 24 16:23:37 tst01 auth|security:debug /usr/sbin/getty PAM: pam_authenticate: error Authentication failed
>>>Mar 24 16:23:37 tst01 auth|security:debug /usr/sbin/getty PAM: pam_set_item(6)
>>>Mar 24 16:23:37 tst01 auth|security:debug /usr/sbin/getty PAM: pam_acct_mgmt()
>>>Mar 24 16:23:37 tst01 auth|security:debug /usr/sbin/getty PAM: load_modules: /usr/lib/security/pam_aix
>>>Mar 24 16:23:37 tst01 auth|security:debug /usr/sbin/getty PAM: load_function: successful load of pam_sm_acct_mgmt
>>>Mar 24 16:23:37 tst01 auth|security:debug /usr/sbin/getty PAM: pam_acct_mgmt: error No account present for user
>>>Mar 24 16:23:37 tst01 auth|security:debug /usr/sbin/getty PAM: pam_end(): status = Authentication failed
>>>Mar 24 16:23:37 tst01 auth|security:info syslog: vty0: failed login attempt for UNKNOWN_USER
>>>
>>>Doing a ldapsearch with bprins at example.corp as bind user works without any problems.
>>According to the log above you get failure from pam_aix which should be
>>expected if pam_aix doesn't think that the user in question is coming
>>from LDAP.
>>
>>Can you show output of
>>
>>lsuser -R LDAP bprins at example.corp
>>lsuser -a registry SYSTEM bprins at example.corp
>>
>>The attributes 'registry' and 'SYSTEM' should be set to LDAP (or KRB5LDAP).
>>
>>Can you show how you configured the AIX client?
>>
>>--
>>/ Alexander Bokovoy
>
>lsuser -R LDAP bprins at example.corp:
>bprins at example.corp id=211623277 pgrp=bprins at example.corp groups=bprins at example.corp home=/home/example.corp/bprins shell=/bin/bash gecos=Bobby Prins login=true su=true rlogin=true daemon=true admin=false sugroups=ALL admgroups= tpath=nosak ttys=ALL expires=0 auth1=SYSTEM auth2=NONE umask=22 registry=LDAP SYSTEM=LDAP logintimes= loginretries=0 pwdwarntime=0 account_locked=false minage=0 maxage=0 maxexpired=-1 minalpha=0 minloweralpha=0 minupperalpha=0 minother=0 mindigit=0 minspecialchar=0 mindiff=0 maxrepeats=8 minlen=0 histexpire=0 histsize=0 pwdchecks= dictionlist= default_roles= fsize=8388604 cpu=-1 data=262144 stack=65536 core=2097151 rss=65536 nofiles=2000 roles=
I assume you have /bin/bash installed on AIX? This user has shell
defined as /bin/bash and if it is missing, login or ssh will deny its
access to the system.

>
>lsuser -a registry SYSTEM bprins at example.corp:
>bprins at example.corp registry=LDAP SYSTEM=LDAP
>
>Contents of /etc/security/ldap/ldap.cfg:
>ldapservers:idm01.unix.example.corp
>authtype:ldap_auth
>useSSL:no
>userattrmappath:/etc/security/ldap/IPAuser.map
>groupattrmappath:/etc/security/ldap/IPAgroup.map
>userbasedn:cn=users,cn=compat,dc=unix,dc=example,dc=corp
>groupbasedn:cn=groups,cn=compat,dc=unix,dc=example,dc=corp
>userclasses:posixaccount
>groupclasses:posixgroup
>ldapport:389
>searchmode:ALL
>defaultentrylocation:LDAP
>serverschematype:rfc2307
>
>Map file /etc/security/ldap/IPAuser.map:
>#IPAuser.map file
>keyobjectclass  SEC_CHAR        posixaccount            s
>
># The following attributes are required by AIX to be functional
>username        SEC_CHAR        uid                     s
>id              SEC_INT         uidnumber               s
>pgrp            SEC_CHAR        gidnumber               s
>home            SEC_CHAR        homedirectory           s
>shell           SEC_CHAR        loginshell              s
>gecos           SEC_CHAR        gecos                   s
>spassword       SEC_CHAR        userpassword            s
>lastupdate      SEC_INT         shadowlastchange        s
>
>Map file /etc/security/ldap/IPAgroup.map:
>#IPAgroup.map file
>groupname       SEC_CHAR    cn                    s
>id              SEC_INT     gidNumber             s
>users           SEC_LIST    member                m
>
>With the current setup users created on the IPA server work, AD users not.
The rest of configuration looks fine. Given that PAM debug output
mentions pam_aix, can you show /etc/pam.conf and
/etc/security/login.cfg. I suspect that you have auth_type=PAM_AUTH in
/etc/security/login.cfg, that's why PAM authentication is in use and
pam_aix should theoretically pick up LDAP via LAM mechanism.
-- 
/ Alexander Bokovoy