Bug 319391 - /var/tmp/host_0 is created with the wrong context
/var/tmp/host_0 is created with the wrong context
Product: Fedora
Classification: Fedora
Component: krb5 (Show other bugs)
All Linux
low Severity high
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Assigned To: Nalin Dahyabhai
Fedora Extras Quality Assurance
Depends On:
Blocks: 428355
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Reported: 2007-10-04 18:48 EDT by Kostas Georgiou
Modified: 2008-06-16 22:34 EDT (History)
2 users (show)

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Doc Type: Bug Fix
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Last Closed: 2008-06-16 22:34:48 EDT
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Description Kostas Georgiou 2007-10-04 18:48:17 EDT
sshd creates /var/tmp/host_0 with the following context at startup (I guess it's
the first kerberized service in rc)

# ls -Z /var/tmp/host_0
-rw-------  root root system_u:object_r:sshd_tmp_t:s0  /var/tmp/host_0

This unfortunately prevents other programs from accessing the ticket cache, for
example my cyrus server generates this:

type=AVC msg=audit(1191536511.682:55356): avc:  denied  { getattr } for 
pid=2415 comm="saslauthd" name="host_0" dev=dm-4 ino=131079
tcontext=system_u:object_r:sshd_tmp_t:s0 tclass=file
type=SYSCALL msg=audit(1191536511.682:55356): arch=c000003e syscall=4 success=no
exit=-13 a0=815bd0 a1=7fff0c929370 a2=7fff0c929370 a3=338c54c9d0 items=0
ppid=2414 pid=2415 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0
sgid=0 fsgid=0 tty=(none) comm="saslauthd" exe="/usr/sbin/saslauthd"
subj=system_u:system_r:saslauthd_t:s0 key=(null)
type=AVC_PATH msg=audit(1191536511.682:55356):  path="/var/tmp/host_0"

A restorecon returns the file to the right context as expected
# restorecon -v - /var/tmp/host_0
restorecon reset /var/tmp/host_0 context

If I remove the file and connect with imap first the file gets the
system_u:object_r:saslauthd_tmp_t:s0 context, I suspect the same will happen
with nfs4 etc. The file needs to be created with the "right" context regardless
of the context of the process that creates it but I have no idea at all how it
can be done.
Comment 1 Nalin Dahyabhai 2007-10-05 10:10:41 EDT
There's a patch in Raw Hide to do this, but I'm beginning to think that it needs
some reworking because it depends on preprocessor tricks that might not work
correctly going forward.  Leaving open until I fix that, someone beats me to it,
or it gets backported to F7.
Comment 2 Bug Zapper 2008-05-14 10:37:36 EDT
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Comment 3 Bug Zapper 2008-06-16 22:34:46 EDT
Fedora 7 changed to end-of-life (EOL) status on June 13, 2008. 
Fedora 7 is no longer maintained, which means that it will not 
receive any further security or bug fix updates. As a result we 
are closing this bug. 

If you can reproduce this bug against a currently maintained version 
of Fedora please feel free to reopen this bug against that version.

Thank you for reporting this bug and we are sorry it could not be fixed.

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