I set up a common kerberos authentication for my domain. After that, it's working fine without any issues. But a user cannot change the password using Linux command. On analysis on this, I got the below error in /var/log/auth.log
:
bharathi passwd[3715]: pam_unix(passwd:chauthtok): authentication failure; logname=test uid=1000 euid=0 tty= ruser= rhost= user=test
Response from Kerberos Admin Server.
May 11 16:44:48 bharathi krb5kdc[28795](info): AS_REQ (4 etypes {18 17 16 23}) 192.168.27.50: NEEDED_PREAUTH: test@ZMEDIA.COM for kadmin/changepw@ZMEDIA.COM, Additional pre-authentication required
May 11 16:44:48 bharathi krb5kdc[28795](info): AS_REQ (4 etypes {18 17 16 23}) 192.168.27.50: ISSUE: authtime 1368270888, etypes {rep=18 tkt=18 ses=18}, test@ZMEDIA.COM for kadmin/changepw@ZMEDIA.COM
May 11 16:45:07 bharathi krb5kdc[28795](info): AS_REQ (4 etypes {18 17 16 23}) 192.168.27.50: NEEDED_PREAUTH: test@ZMEDIA.COM for kadmin/changepw@ZMEDIA.COM, Additional pre-authentication required
May 11 16:45:07 bharathi krb5kdc[28795](info): AS_REQ (4 etypes {18 17 16 23}) 192.168.27.50: ISSUE: authtime 1368270907, etypes {rep=18 tkt=18 ses=18}, test@ZMEDIA.COM for kadmin/changepw@ZMEDIA.COM
Response from kerberos admin server seems to be okay. I suspect the problem might be in pam.d
configuration.
common-auth
#
# /etc/pam.d/common-auth - authentication settings common to all services
#
# This file is included from other service-specific PAM config files,
# and should contain a list of the authentication modules that define
# the central authentication scheme for use on the system
# (e.g., /etc/shadow, LDAP, Kerberos, etc.). The default is to use the
# traditional Unix authentication mechanisms.
#
# As of pam 1.0.1-6, this file is managed by pam-auth-update by default.
# To take advantage of this, it is recommended that you configure any
# local modules either before or after the default block, and use
# pam-auth-update to manage selection of other modules. See
# pam-auth-update(8) for details.
auth sufficient pam_krb5.so minimum_uid=1000
# here are the per-package modules (the "Primary" block)
auth [success=3 default=ignore] pam_krb5.so minimum_uid=1000
auth [success=2 default=ignore] pam_unix.so nullok_secure try_first_pass
auth [success=1 default=ignore] pam_lsass.so try_first_pass
# here's the fallback if no module succeeds
auth requisite pam_deny.so
# prime the stack with a positive return value if there isn't one already;
# this avoids us returning an error just because nothing sets a success code
# since the modules above will each just jump around
auth required pam_permit.so
# and here are more per-package modules (the "Additional" block)
# end of pam-auth-update config
common-account
#
# /etc/pam.d/common-account - authorization settings common to all services
#
# This file is included from other service-specific PAM config files,
# and should contain a list of the authorization modules that define
# the central access policy for use on the system. The default is to
# only deny service to users whose accounts are expired in /etc/shadow.
#
# As of pam 1.0.1-6, this file is managed by pam-auth-update by default.
# To take advantage of this, it is recommended that you configure any
# local modules either before or after the default block, and use
# pam-auth-update to manage selection of other modules. See
# pam-auth-update(8) for details.
#
account required pam_krb5.so minimum_uid=1000
# here are the per-package modules (the "Primary" block)
account [success=3 new_authtok_reqd=done default=ignore] pam_unix.so
account [success=ok new_authtok_reqd=ok default=ignore] pam_lsass.so unknown_ok
account [success=1 new_authtok_reqd=done default=ignore] pam_lsass.so
# here's the fallback if no module succeeds
account requisite pam_deny.so
# prime the stack with a positive return value if there isn't one already;
# this avoids us returning an error just because nothing sets a success code
# since the modules above will each just jump around
account required pam_permit.so
# and here are more per-package modules (the "Additional" block)
# end of pam-auth-update config
common-password
#
# /etc/pam.d/common-password - password-related modules common to all services
#
# This file is included from other service-specific PAM config files,
# and should contain a list of modules that define the services to be
# used to change user passwords. The default is pam_unix.
# Explanation of pam_unix options:
#
# The "sha512" option enables salted SHA512 passwords. Without this option,
# the default is Unix crypt. Prior releases used the option "md5".
#
# The "obscure" option replaces the old `OBSCURE_CHECKS_ENAB' option in
# login.defs.
#
# See the pam_unix manpage for other options.
# As of pam 1.0.1-6, this file is managed by pam-auth-update by default.
# To take advantage of this, it is recommended that you configure any
# local modules either before or after the default block, and use
# pam-auth-update to manage selection of other modules. See
# pam-auth-update(8) for details.
# here are the per-package modules (the "Primary" block)
password requisite pam_krb5.so minimum_uid=1000
password [success=2 default=ignore] pam_unix.so obscure use_authtok try_first_pass sha512
password [success=1 default=ignore] pam_lsass.so use_authtok try_first_pass
# here's the fallback if no module succeeds
password requisite pam_deny.so
# prime the stack with a positive return value if there isn't one already;
# this avoids us returning an error just because nothing sets a success code
# since the modules above will each just jump around
password required pam_permit.so
# and here are more per-package modules (the "Additional" block)
password optional pam_gnome_keyring.so
# end of pam-auth-update config
What am I doing wrong here?