Bug 512830

Description of problem:

Using safekeep, deploy keys with 'safekeep --keys --deploy' (and give root password). Subsequently 'safekeep --server' should ssh without requiring a password. What actually happens is the selinux denial below and sshd falls back to asking for a password.

After "restorecon root/.ssh/authorized_keys", everything works perfectly.

This happens even when deleting /root/.ssh/ and letting it be re-created during the key deployment.


Version-Release number of selected component (if applicable):

openssh-server-5.2p1-2.fc11.i586
selinux-policy-3.6.12-62.fc11.noarch
safekeep-server-1.0.5-2.fc11.noarch
  

Additional info:

SELinux is preventing sshd (sshd_t) "read" to /root/.ssh/authorized_keys
(admin_home_t).

Detailed Description:

SELinux denied access requested by sshd. /root/.ssh/authorized_keys may be a
mislabeled. /root/.ssh/authorized_keys default SELinux type is home_ssh_t, but
its current type is admin_home_t. Changing this file back to the default type,
may fix your problem.

File contexts can be assigned to a file in the following ways.

  * Files created in a directory receive the file context of the parent
    directory by default.
  * The SELinux policy might override the default label inherited from the
    parent directory by specifying a process running in context A which creates
    a file in a directory labeled B will instead create the file with label C.
    An example of this would be the dhcp client running with the dhclient_t type
    and creates a file in the directory /etc. This file would normally receive
    the etc_t type due to parental inheritance but instead the file is labeled
    with the net_conf_t type because the SELinux policy specifies this.
  * Users can change the file context on a file using tools such as chcon, or
    restorecon.

This file could have been mislabeled either by user error, or if an normally
confined application was run under the wrong domain.

However, this might also indicate a bug in SELinux because the file should not
have been labeled with this type.

If you believe this is a bug, please file a bug report
(http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) against this package.

Allowing Access:

You can restore the default system context to this file by executing the
restorecon command. restorecon '/root/.ssh/authorized_keys', if this file is a
directory, you can recursively restore using restorecon -R
'/root/.ssh/authorized_keys'.

Fix Command:

restorecon '/root/.ssh/authorized_keys'

Additional Information:

Source Context                system_u:system_r:sshd_t:s0-s0:c0.c1023
Target Context                unconfined_u:object_r:admin_home_t:s0
Target Objects                /root/.ssh/authorized_keys [ file ]
Source                        sshd
Source Path                   /usr/sbin/sshd
Port                          <Unknown>
Host                          mostin
Source RPM Packages           openssh-server-5.2p1-2.fc11
Target RPM Packages           
Policy RPM                    selinux-policy-3.6.12-62.fc11
Selinux Enabled               True
Policy Type                   targeted
MLS Enabled                   True
Enforcing Mode                Enforcing
Plugin Name                   restorecon
Host Name                     mostin
Platform                      Linux mostin 2.6.29.5-191.fc11.i586 #1 SMP Tue Jun
                              16 23:11:39 EDT 2009 i686 athlon
Alert Count                   4
First Seen                    Mon 20 Jul 2009 20:44:22 BST
Last Seen                     Mon 20 Jul 2009 21:10:03 BST
Local ID                      4bc43249-b983-471b-9410-6f2c4bd1051a
Line Numbers                  

Raw Audit Messages            

node=mostin type=AVC msg=audit(1248120603.552:225): avc:  denied  { read } for  pid=10203 comm="sshd" name="authorized_keys" dev=dm-6 ino=125282 scontext=system_u:system_r:sshd_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:admin_home_t:s0 tclass=file

node=mostin type=SYSCALL msg=audit(1248120603.552:225): arch=40000003 syscall=5 success=no exit=-13 a0=1406598 a1=8800 a2=0 a3=13f8a18 items=0 ppid=9593 pid=10203 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="sshd" exe="/usr/sbin/sshd" subj=system_u:system_r:sshd_t:s0-s0:c0.c1023 key=(null)