problem with kerberos in centos 6.5

bikesh · 12-12-2014, 10:22 AM

i think i have configure kerberos for password authentication and i am checking it for a ssh service,
on server machine i run klist it shows nothing and when i run kinit it shows some information regarding ticket issue date and expire date ..
now i configure /etc/ssh/sshd_config file and i changes GSSAPIAuhtrntication and GSSAPIcleanCredential= yes
now i try to log in using ssh and i am succeed but i should provide a password to log in.
why it is asking me for a password??? i think i should use ticket to log in
does any body encounter such suitation ?? is there any promblem in my kerberos configuration file

jpollard · 12-13-2014, 07:15 AM

We will need more information first.

Try "ssh -v servername"

This should show something similar to:

Code:

ssh -v localhost
OpenSSH_5.8p2, OpenSSL 1.0.0j-fips 10 May 2012
debug1: Reading configuration data /home/jesse/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to localhost [127.0.0.1] port 22.
debug1: Connection established.
debug1: identity file /home/jesse/.ssh/id_rsa type -1
debug1: identity file /home/jesse/.ssh/id_rsa-cert type -1
debug1: identity file /home/jesse/.ssh/id_dsa type -1
debug1: identity file /home/jesse/.ssh/id_dsa-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.8
debug1: match: OpenSSH_5.8 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.8
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Server host key: RSA 72:db:d6:64:5d:f7:cd:a0:89:db:35:3c:b3:ee:10:21
debug1: Host 'localhost' is known and matches the RSA host key.
debug1: Found key in /home/jesse/.ssh/known_hosts:2
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Next authentication method: gssapi-keyex
debug1: No valid Key exchange context
debug1: Next authentication method: gssapi-with-mic
debug1: Unspecified GSS failure.  Minor code may provide more information
Credentials cache file '/tmp/krb5cc_500' not found

debug1: Unspecified GSS failure.  Minor code may provide more information
Credentials cache file '/tmp/krb5cc_500' not found

debug1: Unspecified GSS failure.  Minor code may provide more information


debug1: Unspecified GSS failure.  Minor code may provide more information


debug1: Next authentication method: publickey
debug1: Trying private key: /home/jesse/.ssh/id_rsa
debug1: Trying private key: /home/jesse/.ssh/id_dsa
debug1: Next authentication method: password
jesse@localhost's password:

The errors shown for the GSS problem are due to me not having Kerberos setup.

Note, I'm assuming you have already done a kinit to get credentials. Once you do get credentials, you should be able to do a klist on your workstation - and should see only your principle. Once you have attempted a "ssh server" command you SHOULD see a service ticket added to the klist output EVEN IF you are still prompted for a password.