I'm still seeing the gssproxy issue mentioned in this bug:

https://bugzilla.redhat.com/show_bug.cgi?id=1414302

where gssproxy doesn't look in /var/lib/gssproxy/clients/%UID.keytab for a
valid keytab for non-root users.

Bad strace (SL7.3) looks like:

[pid  4528] close(15)                   = 0
[pid  4528] gettimeofday({1490828550, 957971}, NULL) = 0
[pid  4528] geteuid()                   = 0
[pid  4528] open("/var/lib/gssproxy/clients/krb5cc_48", O_RDONLY|O_CLOEXEC) =
-1 ENOENT (No such file or directory)
[pid  4528] open("/var/kerberos/krb5/user/0/client.keytab", O_RDONLY) = -1
ENOENT (No such file or directory)
[pid  4528] writev(2, [{"gssproxy[4524]: (OID: { 1 2 840 113554 1 2 2 })
Unspecified GSS failure.  Minor code may provide more information, No
credentials cache found\n", 142}], 1) = 142

i.e. looks first for active credential cache for the userid (48 in this case),
but then a keytab for uid 0 and in the default kerberos location, not in the
location specified in /etc/gssproxy/gssproxy.conf.

Good strace (RHEL7.3) looks like:

[pid   537] close(15)                   = 0
[pid   537] gettimeofday({1490822814, 63838}, NULL) = 0
[pid   537] open("/var/lib/gssproxy/clients/krb5cc_14", O_RDONLY|O_CLOEXEC) =
-1 ENOENT (No such file or directory)
[pid   537] open("/var/lib/gssproxy/clients/14.keytab", O_RDONLY) = -1 ENOENT
(No such file or directory)

I didn't set up a keytab in this case, but you see that it looked for the
correct file - and didn't call geteuid().

I'm not sure what's going on here.  Perhaps there was a build ordering issue
with the SL7.3 package builds.  I'm going to try rebuilding the SL7.3 packages
and see if that helps.  Just a heads up for now before I leave for the day.


-- 
Orion Poplawski
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