[Freeipa-users] Kerberized NFS Mount Issues
Nordgren, Bryce L -FS
bnordgren at fs.fed.us
Sun Feb 16 19:14:03 UTC 2014
I don't know if this is your issue, but I noticed this:
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: WARNING: Failed to create krb5 context for user with uid 0 for server nfs-server.example.local
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: WARNING: Failed to create machine krb5 context with credentials cache
Who are you "kinit"ed as? Is your idmapper working on both client and server?
Bryce
From: freeipa-users-bounces at redhat.com [mailto:freeipa-users-bounces at redhat.com] On Behalf Of regpm at mccleary.me.uk
Sent: Sunday, February 16, 2014 4:49 AM
To: freeipa-users at redhat.com
Cc: regpm at mccleary.me.uk
Subject: [Freeipa-users] Kerberized NFS Mount Issues
Hi,
I'm really stuck trying to get kerberized NFS configured via IPA and would be very grateful for any comments or advice based on the info I've provided below. I'm sure this is a very popular kerberized service configured under IPA and I must be missing something obvious.
Thanks, Paul
### Background ###
I've configured IPA (3.0.0-37.el6) on CentOS 6.5 (2.6.32-431.3.1.el6.x86_64) and have an NFS server and an NFS client (both also CentOS 6.5) configured and working as IPA clients, e.g. can login as an IPA LDAP user.
I have tested plain NFSv4 and that works fine:
Code:
________________________________
Testing Non-Kerberized NFS v4:
#####
#####
Client:
[root at nfs-client ~]# mount -v -t nfs4 -o rw,sec=sys nfs-server.example.local:/ /mnt
mount.nfs4: timeout set for Sat Feb 15 23:58:23 2014
mount.nfs4: trying text-based options 'sec=sys,addr=10.50.0.18,clientaddr=10.50.0.11'
nfs-server.example.local:/ on /mnt type nfs4 (rw,sec=sys)
[root at nfs-client ~]# df -h /mnt
Filesystem Size Used Avail Use% Mounted on
nfs-server.example.local:/ 50G 14G 33G 30% /mnt
[root at nfs-client ~]# mount|grep nfs
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
nfsd on /proc/fs/nfsd type nfsd (rw)
nfs-server.example.local:/ on /mnt type nfs4 (rw,sec=sys,addr=10.50.0.18,clientaddr=10.50.0.11)
#####
#####
Server:
[root at nfs-server ~]# cat /etc/exports
/pmtest 10.50.0.0/24(rw,sec=sys,fsid=0)
[root at nfs-server ~]# exportfs -v
/pmtest 10.50.0.0/24(rw,wdelay,root_squash,no_subtree_check,fsid=0,sec=sys,rw,root_squash,no_all_squash)
________________________________
When I try to mount using kerberos it fails. I've searched for a number of days and tried many things, but am still stuck. The key error I think is in the NFS server syslog:
Code:
________________________________
Feb 15 23:43:24 nfs-server rpc.svcgssd[6446]: ERROR: GSS-API: error in handle_nullreq: gss_accept_sec_context(): GSS_S_FAILURE (Unspecified GSS failure. Minor code may provide more information) - Wrong principal in request
Feb 15 23:43:24 nfs-server rpc.svcgssd[6446]: ERROR: GSS-API: error in handle_nullreq: gss_accept_sec_context(): GSS_S_FAILURE (Unspecified GSS failure. Minor code may provide more information) - Wrong principal in request
________________________________
I don't understand how I have the wrong principal in the krb5.keytab. The various guides I've seen all have a similar keytab config as me, but I really hoped my first attempt using kerberos was going to be very easy as IPA would do all the hard stuff :-)
###########################################################
Output and Config Info From Failed Kerberized NFS mount:
Both client and server have secure NFS set to yes and name resolution is fine:
Code:
________________________________
[root at nfs-client ~]# nslookup nfs-server
Server: 10.50.0.20
Address: 10.50.0.20#53
Name: nfs-server.example.local
Address: 10.50.0.18
[root at nfs-client ~]# nslookup nfs-client
Server: 10.50.0.20
Address: 10.50.0.20#53
Name: nfs-client.example.local
Address: 10.50.0.11
[root at nfs-server ~]# nslookup nfs-server
Server: 10.50.0.20
Address: 10.50.0.20#53
Name: nfs-server.example.local
Address: 10.50.0.18
[root at nfs-server ~]# nslookup nfs-client
Server: 10.50.0.20
Address: 10.50.0.20#53
Name: nfs-client.example.local
Address: 10.50.0.11
________________________________
Code:
________________________________
#####
#####
Client:
[root at nfs-client ~]# service iptables status;getenforce
iptables: Firewall is not running.
Disabled
Attempted mount:
[root at nfs-client ~]# mount -v -t nfs4 -o rw,sec=krb5 nfs-server.example.local:/ /mnt
mount.nfs4: timeout set for Sat Feb 15 23:45:23 2014
mount.nfs4: trying text-based options 'sec=krb5,addr=10.50.0.18,clientaddr=10.50.0.11'
mount.nfs4: mount(2): Permission denied
mount.nfs4: access denied by server while mounting nfs-server.example.local:/
/var/log/messages:
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: dir_notify_handler: sig 37 si 0x7fffaf4fac70 data 0x7fffaf4fab40
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: dir_notify_handler: sig 37 si 0x7fffaf4fac70 data 0x7fffaf4fab40
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: dir_notify_handler: sig 37 si 0x7fffaf4fac70 data 0x7fffaf4fab40
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: dir_notify_handler: sig 37 si 0x7fffaf4fac70 data 0x7fffaf4fab40
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: dir_notify_handler: sig 37 si 0x7fffaf4fac70 data 0x7fffaf4fab40
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: handling gssd upcall (/var/lib/nfs/rpc_pipefs/nfs/clnt0)
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: handle_gssd_upcall: 'mech=krb5 uid=0 enctypes=18,17,16,23,3,1,2 '
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: handling krb5 upcall (/var/lib/nfs/rpc_pipefs/nfs/clnt0)
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: process_krb5_upcall: service is '<null>'
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: Full hostname for 'nfs-server.example.local' is 'nfs-server.example.local'
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: Full hostname for 'nfs-client.example.local' is 'nfs-client.example.local'
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: No key table entry found for NFS-CLIENT.EXAMPLE.LOCAL$@EXAMPLE.LOCAL<mailto:NFS-CLIENT.EXAMPLE.LOCAL$@EXAMPLE.LOCAL> while getting keytab entry for 'NFS-CLIENT.EXAMPLE.LOCAL$@EXAMPLE.LOCAL<mailto:NFS-CLIENT.EXAMPLE.LOCAL$@EXAMPLE.LOCAL>'
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: No key table entry found for root/nfs-client.example.local at EXAMPLE.LOCAL<mailto:root/nfs-client.example.local at EXAMPLE.LOCAL> while getting keytab entry for 'root/nfs-client.example.local at EXAMPLE.LOCAL<mailto:root/nfs-client.example.local at EXAMPLE.LOCAL>'
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: Success getting keytab entry for 'nfs/nfs-client.example.local at EXAMPLE.LOCAL<mailto:nfs/nfs-client.example.local at EXAMPLE.LOCAL>'
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: Successfully obtained machine credentials for principal 'nfs/nfs-client.example.local at EXAMPLE.LOCAL<mailto:nfs/nfs-client.example.local at EXAMPLE.LOCAL>' stored in ccache 'FILE:/tmp/krb5cc_machine_EXAMPLE.LOCAL<FILE:///\\tmp\krb5cc_machine_EXAMPLE.LOCAL>'
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: INFO: Credentials in CC 'FILE:/tmp/krb5cc_machine_EXAMPLE.LOCAL<FILE:///\\tmp\krb5cc_machine_EXAMPLE.LOCAL>' are good until 1392594203
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: using FILE:/tmp/krb5cc_machine_EXAMPLE.LOCAL<FILE:///\\tmp\krb5cc_machine_EXAMPLE.LOCAL> as credentials cache for machine creds
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: using environment variable to select krb5 ccache FILE:/tmp/krb5cc_machine_EXAMPLE.LOCAL<FILE:///\\tmp\krb5cc_machine_EXAMPLE.LOCAL>
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: creating context using fsuid 0 (save_uid 0)
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: creating tcp client for server nfs-server.example.local
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: DEBUG: port already set to 2049
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: creating context with server nfs at nfs-server.example.local<mailto:nfs at nfs-server.example.local>
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: WARNING: Failed to create krb5 context for user with uid 0 for server nfs-server.example.local
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: WARNING: Failed to create machine krb5 context with credentials cache FILE:/tmp/krb5cc_machine_EXAMPLE.LOCAL<FILE:///\\tmp\krb5cc_machine_EXAMPLE.LOCAL> for server nfs-server.example.local
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: WARNING: Machine cache is prematurely expired or corrupted trying to recreate cache for server nfs-server.example.local
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: Full hostname for 'nfs-server.example.local' is 'nfs-server.example.local'
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: Full hostname for 'nfs-client.example.local' is 'nfs-client.example.local'
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: No key table entry found for NFS-CLIENT.EXAMPLE.LOCAL$@EXAMPLE.LOCAL<mailto:NFS-CLIENT.EXAMPLE.LOCAL$@EXAMPLE.LOCAL> while getting keytab entry for 'NFS-CLIENT.EXAMPLE.LOCAL$@EXAMPLE.LOCAL<mailto:NFS-CLIENT.EXAMPLE.LOCAL$@EXAMPLE.LOCAL>'
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: No key table entry found for root/nfs-client.example.local at EXAMPLE.LOCAL<mailto:root/nfs-client.example.local at EXAMPLE.LOCAL> while getting keytab entry for 'root/nfs-client.example.local at EXAMPLE.LOCAL<mailto:root/nfs-client.example.local at EXAMPLE.LOCAL>'
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: Success getting keytab entry for 'nfs/nfs-client.example.local at EXAMPLE.LOCAL<mailto:nfs/nfs-client.example.local at EXAMPLE.LOCAL>'
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: INFO: Credentials in CC 'FILE:/tmp/krb5cc_machine_EXAMPLE.LOCAL<FILE:///\\tmp\krb5cc_machine_EXAMPLE.LOCAL>' are good until 1392594203
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: INFO: Credentials in CC 'FILE:/tmp/krb5cc_machine_EXAMPLE.LOCAL<FILE:///\\tmp\krb5cc_machine_EXAMPLE.LOCAL>' are good until 1392594203
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: using FILE:/tmp/krb5cc_machine_EXAMPLE.LOCAL<FILE:///\\tmp\krb5cc_machine_EXAMPLE.LOCAL> as credentials cache for machine creds
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: using environment variable to select krb5 ccache FILE:/tmp/krb5cc_machine_EXAMPLE.LOCAL<FILE:///\\tmp\krb5cc_machine_EXAMPLE.LOCAL>
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: creating context using fsuid 0 (save_uid 0)
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: creating tcp client for server nfs-server.example.local
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: DEBUG: port already set to 2049
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: creating context with server nfs at nfs-server.example.local<mailto:nfs at nfs-server.example.local>
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: WARNING: Failed to create krb5 context for user with uid 0 for server nfs-server.example.local
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: WARNING: Failed to create machine krb5 context with credentials cache FILE:/tmp/krb5cc_machine_EXAMPLE.LOCAL<FILE:///\\tmp\krb5cc_machine_EXAMPLE.LOCAL> for server nfs-server.example.local
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: WARNING: Failed to create machine krb5 context with any credentials cache for server nfs-server.example.local
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: doing error downcall
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: dir_notify_handler: sig 37 si 0x7fffaf4fa770 data 0x7fffaf4fa640
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: dir_notify_handler: sig 37 si 0x7fffaf4fa770 data 0x7fffaf4fa640
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: dir_notify_handler: sig 37 si 0x7fffaf4fa770 data 0x7fffaf4fa640
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: dir_notify_handler: sig 37 si 0x7fffaf4fa770 data 0x7fffaf4fa640
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: dir_notify_handler: sig 37 si 0x7fffaf4fa770 data 0x7fffaf4fa640
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: dir_notify_handler: sig 37 si 0x7fffaf4fa770 data 0x7fffaf4fa640
Feb 15 23:43:23 nfs-client rpc.gssd[1123]: destroying client /var/lib/nfs/rpc_pipefs/nfs/clnt0
/etc/krb5.conf
includedir /var/lib/sss/pubconf/krb5.include.d/
[libdefaults]
default_realm = EXAMPLE.LOCAL
dns_lookup_realm = false
dns_lookup_kdc = true
rdns = false
ticket_lifetime = 24h
forwardable = yes
allow_weak_crypto = true
permitted_enctypes = des3-cbc-sha1
[realms]
EXAMPLE.LOCAL = {
kdc = ipa-server.example.local:88
master_kdc = ipa-server.example.local:88
admin_server = ipa-server.example.local:749
default_domain = example.local
pkinit_anchors = FILE:/etc/ipa/ca.crt<FILE:///\\etc\ipa\ca.crt>
}
[domain_realm]
.example.local = EXAMPLE.LOCAL
example.local = EXAMPLE.LOCAL
/etc/krb5.keytab entries:
[root at nfs-client ~]# klist -kte
Keytab name: FILE:/etc/krb5.keytab<FILE:///\\etc\krb5.keytab>
KVNO Timestamp Principal
---- ----------------- --------------------------------------------------------
4 02/15/14 23:27:51 host/nfs-client.example.local at EXAMPLE.LOCAL<mailto:host/nfs-client.example.local at EXAMPLE.LOCAL> (des3-cbc-sha1)
3 02/15/14 23:27:58 nfs/nfs-client.example.local at EXAMPLE.LOCAL<mailto:nfs/nfs-client.example.local at EXAMPLE.LOCAL> (des3-cbc-sha1)
#####
#####
Server:
[root at nfs-server ~]# cat /etc/exports
/pmtest 10.50.0.0/24(rw,sec=krb5,fsid=0)
[root at nfs-server ~]# exportfs -v
/pmtest 10.50.0.0/24(rw,wdelay,root_squash,no_subtree_check,fsid=0,sec=krb5,rw,root_squash,no_all_squash)
[root at nfs-server ~]# service iptables status;getenforce
iptables: Firewall is not running.
Disabled
/var/log/messages:
Feb 15 23:43:24 nfs-server rpc.svcgssd[6446]: ERROR: GSS-API: error in handle_nullreq: gss_accept_sec_context(): GSS_S_FAILURE (Unspecified GSS failure. Minor code may provide more information) - Wrong principal in request
Feb 15 23:43:24 nfs-server rpc.svcgssd[6446]: ERROR: GSS-API: error in handle_nullreq: gss_accept_sec_context(): GSS_S_FAILURE (Unspecified GSS failure. Minor code may provide more information) - Wrong principal in request
/etc/krb5.conf
includedir /var/lib/sss/pubconf/krb5.include.d/
[libdefaults]
default_realm = EXAMPLE.LOCAL
dns_lookup_realm = true
dns_lookup_kdc = true
rdns = false
ticket_lifetime = 24h
forwardable = yes
allow_weak_crypto = true
permitted_enctypes = des3-cbc-sha1
[realms]
EXAMPLE.LOCAL = {
kdc = ipa-server.example.local:88
master_kdc = ipa-server.example.local:88
admin_server = ipa-server.example.local:749
default_domain = example.local
pkinit_anchors = FILE:/etc/ipa/ca.crt<FILE:///\\etc\ipa\ca.crt>
}
[domain_realm]
.example.local = EXAMPLE.LOCAL
example.local = EXAMPLE.LOCAL
/etc/krb5.keytab entries:
[root at nfs-server ~]# klist -kte
Keytab name: FILE:/etc/krb5.keytab<FILE:///\\etc\krb5.keytab>
KVNO Timestamp Principal
---- ----------------- --------------------------------------------------------
2 02/15/14 23:09:43 host/nfs-server.example.local at EXAMPLE.LOCAL<mailto:host/nfs-server.example.local at EXAMPLE.LOCAL> (des3-cbc-sha1)
3 02/15/14 23:09:51 nfs/nfs-server.example.local at EXAMPLE.LOCAL<mailto:nfs/nfs-server.example.local at EXAMPLE.LOCAL> (des3-cbc-sha1)
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