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



>From: fedora-list-bounces redhat com
>[mailto:fedora-list-bounces redhat com]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 redhat com
>>[mailto:fedora-list-bounces redhat com]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

-- 
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.371 / Virus Database: 267.14.1/206 - Release Date: 12/16/2005
 


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