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Bug 1441376 - gssproxy unable to access /var/lib/ipa/gssproxy/http.keytab
Summary: gssproxy unable to access /var/lib/ipa/gssproxy/http.keytab
Keywords:
Status: CLOSED DUPLICATE of bug 1432115
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: ipa
Version: 7.4
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Martin Bašti
QA Contact: ipa-qe
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-04-11 20:19 UTC by Scott Poore
Modified: 2017-04-20 10:52 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2017-04-20 10:52:20 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Scott Poore 2017-04-11 20:19:08 UTC 
Description of problem:

It appears that on a fresh IPA install, there may be issues with SELinux and/or permissions set for /var/lib/ipa/gssproxy/http.keytab.

With SELinux in enforcing mode, we see ipa commands fail and AVC denials.

[root@rhel7-2 audit]# ipa user-find
ipa: ERROR: No valid Negotiate header in server response

[root@rhel7-2 audit]# cat audit.log|audit2allow 
#============= gssproxy_t ==============
allow gssproxy_t self:capability { dac_override dac_read_search };


With some digging, we see the following failure in /var/log/messages from when gssproxy started:

Apr 11 15:00:57 rhel7-2 gssproxy: gssproxy[6803]: (OID: { 1 2 840 113554 1 2 2 }) Unspecified GSS failure.  Minor code may provide more information, Keytab FILE:/var/lib/ipa/gssproxy/http.keytab is nonexistent or empty

Looking at the directory and file:

[root@rhel7-2 ~]# ls -ldZ /var/lib/ipa/gssproxy
drwx------. root root system_u:object_r:ipa_var_lib_t:s0 /var/lib/ipa/gssproxy

[root@rhel7-2 ~]# ls -ldZ /var/lib/ipa/gssproxy/http.keytab 
-rw-------. apache apache unconfined_u:object_r:ipa_var_lib_t:s0 /var/lib/ipa/gssproxy/http.keytab


Version-Release number of selected component (if applicable):
ipa-server-4.5.0-5.el7.x86_64
gssproxy-0.7.0-3.el7.x86_64


How reproducible:
always if gssproxy is started when SELinux in enforcing mode.

Steps to Reproduce:
1.  ipa-server-install*
2.  setenforce 1
3.  ipactl restart
4.  ipa user-find

*note that due to some other unrelated AVC work still being finished, this had to be run with in permissive mode.

Actual results:
Throws errors and AVCs

Expected results:
No errors or AVCs 

Additional info:
Comment 2 Scott Poore 2017-04-11 20:20:05 UTC 
FYI, full AVC denial messages:

[root@rhel7-2 ~]# ausearch -m avc
----
time->Tue Apr 11 15:12:24 2017
type=SYSCALL msg=audit(1491941544.278:552): arch=c000003e syscall=2 success=no exit=-13 a0=7fde7002a670 a1=0 a2=1b6 a3=24 items=0 ppid=1 pid=6803 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="gssproxy" exe="/usr/sbin/gssproxy" subj=system_u:system_r:gssproxy_t:s0 key=(null)

type=AVC msg=audit(1491941544.278:552): avc:  denied  { dac_read_search } for  pid=6803 comm="gssproxy" capability=2  scontext=system_u:system_r:gssproxy_t:s0 tcontext=system_u:system_r:gssproxy_t:s0 tclass=capability

type=AVC msg=audit(1491941544.278:552): avc:  denied  { dac_override } for  pid=6803 comm="gssproxy" capability=1  scontext=system_u:system_r:gssproxy_t:s0 tcontext=system_u:system_r:gssproxy_t:s0 tclass=capability
Comment 3 Petr Vobornik 2017-04-12 08:01:10 UTC 
Martin, are these AVCs part of the ones you reported after your investigation?
Comment 4 Martin Bašti 2017-04-12 08:19:32 UTC 
Well,

I reported following:

Raw Audit Messages
type=AVC msg=audit(1491815464.382:104238): avc:  denied  { dac_override } for  pid=109579 comm="gssproxy" capability=1  scontext=system_u:system_r:gssproxy_t:s0 tcontext=system_u:system_r:gssproxy_t:s0 tclass=capability


type=SYSCALL msg=audit(1491815464.382:104238): arch=x86_64 syscall=open success=yes exit=EEXIST a0=7f8c34047c90 a1=0 a2=1b6 a3=24 items=0 ppid=1 pid=109579 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=gssproxy exe=/usr/sbin/gssproxy subj=system_u:system_r:gssproxy_t:s0 key=(null)


But for unknown reason it misses this AVC:

type=AVC msg=audit(1491941544.278:552): avc:  denied  { dac_read_search } for  pid=6803 comm="gssproxy" capability=2  scontext=system_u:system_r:gssproxy_t:s0 tcontext=system_u:system_r:gssproxy_t:s0 tclass=capability
Comment 5 Martin Bašti 2017-04-12 08:42:43 UTC 
Maybe because gssproxy in enforcing mode failed to access keytab, it probably tried another method and caused a new AVC that I haven't been able to get in permissive mode.
Comment 6 Martin Bašti 2017-04-20 10:52:20 UTC 
Reported as part of bug 1432115

*** This bug has been marked as a duplicate of bug 1432115 ***
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