Fedora 13: when home directory is a subdir through nfs and/or link
When I upgraded my fedora boxes in a cluster to fedora 13, I found that I can nolonger login locally via graphical interface, and remote login dropped me to / since it could not change dir to user home.
I then
setenforce 0
All back to normal.
However,
audit2allow -m local -l -i /var/log/audit/audit.log
did not show any error, so do
grep seal /var/log/messages
And I did not find any reasonable solution from internet.
For order version of fedora, I used to use local.te to enable /home through nfs. Now in version 13 it can be done by
setsebool -P use_nfs_home_dirs=1
But this did not change anything here.
So I went to check the path of real /home, and found that “home” has nfs_t attibute since it is a nfs mount. This is supposed to be resolved by the above means. However, “home” is not mounted under /, but under /data, which is attributed default_t. I believe that this is the cause of the failure.
To solve this, I made a local.te file as
module local 1.0;
require {
type local_login_t;
type default_t;
type xauth_t;
type sshd_t;
class dir search;
}
#============= sshd_t ==============
allow sshd_t default_t:dir search;
#============= xauth_t ==============
allow xauth_t default_t:dir search;
#============= local_login_t ==============
allow local_login_t default_t:dir search;
This allows sshd, xauth and local_login to go through default_t.
By inserting this to the selinux policy, the issue is fixed.
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The above workaround is flawed. It still did not allow login through
authorized_keys. To make this possible, the local policy should be:
_________________________________________________________________
module local 1.0;
require {
type local_login_t;
type default_t;
type xauth_t;
type sshd_t;
class dir { search getattr };
}
#============= sshd_t ==============
allow sshd_t default_t:dir { search getattr };
#============= xauth_t ==============
allow xauth_t default_t:dir search;
#============= local_login_t ==============
allow local_login_t default_t:dir search;
__________________________________________________________________
To be noted, the reason I report this self-solved issue as a bug is because of
its inconsistencies:
a) It did not generate any denial log in /var/log/audit/audit.log, which made
the debugging unnecessarily difficult;
b) Although it prevented the login process to change dir to user root, and drop
user log in point to /, after logged on, user can “cd ~” without any problem.
This means that the selinux policies for login process is inconsistent with
user shell, like bash or tcsh;
c) This issue did not exist in Fedora 12, means that it was created in the
development of Fedora 13;
d) Up to date, Fedora overnight update did not fix this issue.