Re: Non-root console login issue! (was: Problem with VNC and SELinux:FC4)

[Daniel J Walsh]

Daniel B. Thurman wrote:
> > From: fedora-list-bounces(a)redhat.com
> > [mailto:[e-mail]]On Behalf Of Daniel B. Thurman
> > Sent: Saturday, December 17, 2005 2:30 PM
> > To: For users of Fedora Core releases
> > Cc: Fedora SELinux support list for users & developers.
> > Subject: Non-root console login issue! (was: Problem with VNC and
> > SELinux:FC4)
> >
> >
> >     
> >> From: fedora-list-bounces(a)redhat.com
> >> [mailto:[e-mail]]On Behalf Of Daniel B. Thurman
> >> Sent: Friday, December 16, 2005 6:11 PM
> >> To: For users of Fedora Core releases (E-mail)
> >> Cc: Fedora SELinux support list for users & developers.
> >> Subject: Problem with VNC and SELinux: FC4
> >>
> >>
> >>
> >> Folks,
> >>
> >> With the new SELinux updates, it appears that root,
> >> other than normal users can login to Fedora via VNC
> >> Server?  My VNC Server is setup such that I am using
> >> xinitd for VNC Server requests.
> >>
> >> Another problem I noticed is that when I log into my
> >> Fedora system via VNC as root user, and open a xterm
> >> window and run a su - <normal-user>, I get back a
> >> SElinux message:
> >>
> >> ================================================
> >> # su - dan
> >> Your default context is: user_u:system_r:kernel_t.
> >>
> >> Do you want to want to choose a different one? [n]
> >> ================================================
> >>
> >> It is *possible* that this problem came up when
> >> I had to make a copy of my filesystem to another
> >> hard-disk for the purpose of creating a /boot
> >> partition (my bad) and copied/restored the filesystem
> >> back over to the main drive.  I don't think I made
> >> any copy/restore mistakes as I know the fs permissions
> >> are correct but I cannot speak for filesystem journaling
> >> or whatever that keeps track of the SELinux attributes.
> >>
> >> In any case, what can I do to resolve my VNC and/or su
> >> issue knowing that SElinux has something to do with it?
> >>
> >> Thanks!
> >> Dan Thurman
> >>
> >>       
> > Problem is not related to SELinux and not really related
> > to VNC. It turns out that I cannot log into the console
> > as a non-root user and I get a message saying:
> >
> > =======================================================
> > Your session lasted less than 10 seconds. If you have not
> > logged out yourself, this could mean that there is some
> > installation problem or that you may be out of diskspace.
> > Try logging in with one of the failsafe sessions to see if
> > you can fix this problem.
> >
> > [] View details (~/.xsession-errors file)
> > =======================================================
> >
> > The problem here is that the .xsession-errors file does
> > not exist.  I also note from /var/log/message file:
> >
> > =======================================================
> > Dec 17 12:45:31 linux gdm(pam_unix)[16480]: session opened for 
> > user dant by (uid=0)
> > Dec 17 12:45:32 linux gdm(pam_unix)[16480]: session closed for 
> > user dant
> > Dec 17 12:45:32 linux dbus: avc:  0 AV entries and 0/512 
> > buckets used, longest chain length 0
> > =======================================================
> >
> > And from /var/log/audit/audit.log
> > =======================================================
> > type=USER_AUTH msg=audit(1134858412.155:3929): user pid=3397 
> > uid=0 auid=4294967295 msg='PAM authentication: user=dant 
> > exe="/usr/bin/gdm-binary" (hostname=?, addr=?, terminal=:0 
> > result=Success)'
> > type=USER_ACCT msg=audit(1134858412.159:3930): user pid=3397 
> > uid=0 auid=4294967295 msg='PAM accounting: user=dant 
> > exe="/usr/bin/gdm-binary" (hostname=?, addr=?, terminal=:0 
> > result=Success)'
> > type=CRED_ACQ msg=audit(1134858412.247:3931): user pid=3397 
> > uid=0 auid=4294967295 msg='PAM setcred: user=dant 
> > exe="/usr/bin/gdm-binary" (hostname=?, addr=?, terminal=:0 
> > result=Success)'
> > type=USER_START msg=audit(1134858412.307:3932): user pid=3397 
> > uid=0 auid=4294967295 msg='PAM session open: user=dant 
> > exe="/usr/bin/gdm-binary" (hostname=?, addr=?, terminal=:0 
> > result=Success)'
> > =======================================================
> >
> > File:
> > # ls -l /usr/bin/gdm-binary
> > -rwxr-xr-x  1 root root 251668 May 23  2005 /usr/bin/gdm-binary
> >
> > HALLLLLP!  Please :-)
> >
> > Dan
> >
> >     
>
>  Sorry - had to add this tidbit....  seems that SElinux may be
>  involved or maybe my file journaling is messed up after a "restore"?
>
>  I tried to create a new user account to see if by doing this
>  I would get a correct security context and be able to log
>  into the console but WHOA!!!  What is going on here!?!?!?
>
>  =======================================================
>  [root@linux ~]# useradd dant2
>  useradd: cannot rewrite password file
>  [root@linux ~]#
>  =======================================================
>  File: /var/log/audit/audit.log:
>
>  94967295 msg='useradd: op=adding home directory acct=dant2 res=success'
>  type=AVC msg=audit(1134859204.879:4004): avc:  denied  { create } for  pid=19177
> comm="useradd" name=".kde" scontext=root:system_r:kernel_t
> tcontext=user_u:object_r:user_home_t tclass=dir
>  type=SYSCALL msg=audit(1134859204.879:4004): arch=40000003 syscall=39 success=no exit=-13
> a0=bfd81470 a1=1ed a2=98fd2ef a3=ffffffff items=1 pid=19177 auid=4294967295 uid=0 gid=0
> euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 comm="useradd"
> exe="/usr/sbin/useradd"
>  type=CWD msg=audit(1134859204.879:4004):  cwd="/root"
>  type=PATH msg=audit(1134859204.879:4004): item=0 name="/home/dant2/.kde"
> flags=10  inode=1245989 dev=03:02 mode=040755 ouid=511 ogid=512 rdev=00:00
>  type=AVC msg=audit(1134859204.883:4005): avc:  denied  { create } for  pid=19177
> comm="useradd" name="passwd+" scontext=root:system_r:kernel_t
> tcontext=system_u:object_r:file_t tclass=file
>  type=SYSCALL msg=audit(1134859204.883:4005): arch=40000003 syscall=5 success=no exit=-13
> a0=bfd817e4 a1=8241 a2=1b6 a3=98f6f38 items=1 pid=19177 auid=4294967295 uid=0 gid=0 euid=0
> suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 comm="useradd"
> exe="/usr/sbin/useradd"
>  type=CWD msg=audit(1134859204.883:4005):  cwd="/root"
>  type=PATH msg=audit(1134859204.883:4005): item=0 name="/etc/passwd+" flags=310
> inode=1212417 dev=03:02 mode=040755 ouid=0 ogid=0 rdev=00:00
>  type=USER_CHAUTHTOK msg=audit(1134859204.883:4006): user pid=19177 uid=0 auid=4294967295
> msg='useradd: op=adding user acct=dant2 res=failed'
>  =======================================================
>
>  Dan
>
>     
Looks like you have a labeling problem.  file_t files should not exist 
if your system is properly labeled.  This either indicates you booted 
with selinux=0 or you added additional disks.

You can relabel by executing

touch /.autorelabel
reboot


--