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Message #84185
[Bug 1124250] Re: Partially incorrect uid mapping with nfs4/idmapd/ldap-auth
I am not entirely sure if this is 100%ly related to this bug, but let me
tell you my story here (contains another workaround):
I was also experiencing the problem of frequently having my files owned by 4294967294.
Setup is Ubuntu 14.04 with automounted nfs4/kerberos homes, the NFS server is running Debian Wheezy.
The problem was not existing with the previously used Ubuntu 13.10, so I
began investigating and tried almost everything I found (which is mostly
documented here), ranging from setting sysctl values to installing the
kernel patch posted here.
However, nothing did help, so I decided to debug via /proc/keys:
While I still had the problem, /proc/keys (as seen by root) showed keys
like this:
0094f999 I--Q--- 1 15s 3b010000 0 0 id_legacy
uid:user@fqdn: 5
Note worthing is the remaining time of 15 seconds, shortly thereafter the problem occured for me and /proc/keys looked like
this:
0094f999 I--Q--- 1 expd 3b010000 0 0 id_legacy
uid:user@fqdn: 5
The key was "expired" and there was no new one in the list.
So I issued "nfsidmap -v -c" (which did repair the situation everytime I have tried) and voilà:
5482b3a I--Q--- 1 9m 3b010000 0 0 id_legacy uid:user@fqdn:
5
I had a fresh key with a lifetime of ~ 10 minutes. But listen up, now
comes the final workaround which has "fixed" the problem for about 3 or
4 days now:
# apt-get install keyutils
# restart idmapd
# nfsidmap -v -c
And now the keys do no longer expire:
2014218e I--Q--- 1 perm 3b010000 0 0 id_resolv
uid:user@fqdn: 5
As already mentioned, this is working since several days now without any
issues, my stress-test to check this is by the way:
somedir$ for i in $(seq 100000); do touch $i;sleep 0.2;done
somedir$ while (true); do ls -lR | grep 4294967294;done
I still do not know exactly why installing keyutils has solved the issue
or why this package was not previously installed as a dependency, but
hey, it is a workaround at least for me and maybe others.
--
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https://bugs.launchpad.net/bugs/1124250
Title:
Partially incorrect uid mapping with nfs4/idmapd/ldap-auth
Status in “linux” package in Ubuntu:
Confirmed
Status in “nfs-utils” package in Ubuntu:
Confirmed
Status in “linux” source package in Trusty:
Won't Fix
Status in “nfs-utils” source package in Trusty:
New
Status in “linux” source package in Utopic:
Won't Fix
Status in “nfs-utils” source package in Utopic:
Confirmed
Status in “nfs-utils” package in Debian:
Incomplete
Status in Fedora:
Unknown
Bug description:
I'm running a nfs4 server exporting a directory /home (ext4,usrquota). This server is running Ubuntu 12.04 amd64(up-to-date). This directory is handling 662 homedirs for ldap authenticated users.
/etc/exports is :
/exports 192.168.0.0/24(rw,fsid=0,no_subtree_check)
Important lines in /etc/idmapd.conf :
domain=my-domain.org
[Translation]
Method=nsswitch.
In /etc/default/nfs-common :
NEED_IDMAPD=yes
In /etc/default/nfs-kernel-server :
RPCNFSDCOUNT=75
RPCMOUNTDOPTS=--manage-gids
2 Clients (rhel6 x86 & Ubuntu 12.04.2 i686) are mounting this nfs4 exported directory with no problems :
When doing ls -l /home on this clients, I have :
...
drwx------ 4 user100 oldusers 4096 sept. 21 2011 user100
drwx------ 4 user101 oldusers 4096 sept. 21 2011 user101
drwx------ 37 user102 oldusers 4096 oct. 1 19:06 user102
drwx------ 36 user103 users 4096 févr. 5 21:08 user103
drwx------ 36 user104 users 4096 févr. 8 14:03 user104
drwx------ 30 user105 users 4096 févr. 4 18:01 user105
drwx------ 28 user106 oldusers 4096 oct. 5 2011 user106
drwx------ 37 user107 oldusers 4096 janv. 8 14:52 user107
drwx------ 31 user108 users 4096 déc. 4 11:52 user108
drwx------ 4 user109 oldusers 4096 sept. 21 2011 user109
drwx--x--x 45 user110 oldusers 4096 janv. 22 15:53 user109
drwx------ 31 user111 users 4096 janv. 29 12:03 user110
...
uid/gid mapping works fine, authldap works fine, ...
All Clients running Ubuntu 12.10 i686 or Ubuntu 12.10 amd64 are experiencing the same problem :
The config files are the same that used in ubuntu 12.04.
Auth ldap is correctly configured, user can log in.
This is the /etc/fstab entry for /home :
192.168.0.1:/ /home nfs rw,nfsvers=4 0 0
Important lines in /etc/idmapd.conf :
domain=my-domain.org
[Translation]
Method=nsswitch
In /etc/default/nfs-common :
NEED_IDMAPD=yes
/etc/nsswitch.conf is :
passwd: files ldap
group: files ldap
shadow: files ldap
When doing ls -l /home there is a strange problem :
drwx------ 4 4294967294 oldusers 4096 sept. 21 2011 user100
drwx------ 4 user101 oldusers 4096 sept. 21 2011 user101
drwx------ 37 user102 oldusers 4096 oct. 1 19:06 user102
drwx------ 36 4294967294 users 4096 févr. 5 21:08 user103
drwx------ 36 4294967294 users 4096 févr. 8 14:03 user104
drwx------ 30 4294967294 users 4096 févr. 4 18:01 user105
drwx------ 28 4294967294 oldusers 4096 oct. 5 2011 user106
drwx------ 37 4294967294 oldusers 4096 janv. 8 14:52 user107
drwx------ 31 4294967294 users 4096 déc. 4 11:52 user108
drwx------ 4 user109 oldusers 4096 sept. 21 2011 user109
drwx--x--x 45 4294967294 oldusers 4096 janv. 22 15:53 user110
drwx------ 31 4294967294 users 4096 janv. 29 12:03 user111
for 571 homedirs (this number varies at each reboot)/662, the owner is the value 4294967294. For the 91 remaining homedirs,
the owner is correct. The gidnumber is correctly mapped for all (only 5 differents values used for gidNumber).
In /var/log/syslog, I can see :
For example : user110 is mapped as 4294967294.
but the command "id user110" returns :
uid=31124(user110) gid=666(oldusers) groupes=666(oldusers)
user110 logs in (auth ldap) from tty1. He runs "ls -l /home/user110/"
:
drwxr-xr-x 8 4294967294 oldusers 4096 janv. 19 2012 Bureau
drwxr-xr-x 3 4294967294 oldusers 4096 déc. 2 2011 Documents
drwxr-xr-x 2 4294967294 oldusers 4096 déc. 2 2011 Images
Then, he runs "touch /home/user110/test" :
drwxr-xr-x 8 4294967294 oldusers 4096 janv. 19 2012 Bureau
drwxr-xr-x 3 4294967294 oldusers 4096 déc. 2 2011 Documents
drwxr-xr-x 2 4294967294 oldusers 4096 déc. 2 2011 Images
drwxr-xr-x 2 4294967294 oldusers 0 févr. 13 16:01 test
On the nfs server, If i do a ls -l in the same directory :
drwxr-xr-x 8 user110 oldusers 4096 janv. 19 2012 Bureau
drwxr-xr-x 3 user110 oldusers 4096 déc. 2 2011 Documents
drwxr-xr-x 2 user110 oldusers 4096 déc. 2 2011 Images
drwxr-xr-x 2 user110 oldusers 0 févr. 13 16:01 test
I can see that the "test" file is owned by the correct user.
I've tried without & with nscd, same results.
I've tried using sssd, libnss-sss & pam_sss for ldap auth and having exactly the same results :
In /var/log/syslog, I have :
...
rpc.idmapd[561]: nss_getpwnam: name 'user109@xxxxxxxxxxxxx' domain 'my-domain.org': resulting localname 'user109'
rpc.idmapd[561]: nfs4_name_to_uid: nsswitch->name_to_uid returned 0
rpc.idmapd[561]: nfs4_name_to_uid: final return value is 0
rpc.idmapd[561]: Client 0: (user) name "user109@xxxxxxxxxxxxx" -> id "55101"
rpc.idmapd[561]: nfs4_name_to_uid: calling nsswitch->name_to_uid
rpc.idmapd[561]: nss_getpwnam: name 'user102@xxxxxxxxxxxxx' domain 'my-domain.org': resulting localname 'user102'
rpc.idmapd[561]: nfs4_name_to_uid: nsswitch->name_to_uid returned 0
rpc.idmapd[561]: nfs4_name_to_uid: final return value is 0
rpc.idmapd[561]: Client 0: (user) name "user102@xxxxxxxxxxxxx" -> id "55199"
...
only for the correctly mapped entries. No warnings or errors (rate limit disabled in rsyslog.conf) and verbosity set to 5 in idmapd.conf. It seems that rpc.idmapd never does mapping for other entries.
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