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Bug 1439136 - ipa trust-fetch-domains command displays avc denied message when SELinux is in permissive mode.
Summary: ipa trust-fetch-domains command displays avc denied message when SELinux is i...
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.4
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Lukas Vrabec
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-04-05 10:13 UTC by Sudhir Menon
Modified: 2017-04-10 11:38 UTC (History)
11 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2017-04-05 13:03:20 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Sudhir Menon 2017-04-05 10:13:22 UTC 
Description of problem: ipa trust-fetch-domains command displays avc denied message when SELinux is in permissive mode.

Version-Release number of selected component (if applicable):
ipa-server-dns-4.5.0-4.el7.noarch
libselinux-python-2.5-11.el7.x86_64
libselinux-2.5-11.el7.x86_64
selinux-policy-3.13.1-137.el7.noarch
selinux-policy-targeted-3.13.1-137.el7.noarch

How reproducible:Always

Steps to Reproduce:
1. Ensure SELinux is in permissive mode
2. Install IPA trust and Establish trust with windows 2016 AD
3. Now run ipa trust-fetch-domains win2k16.test

Actual results:
Command runs without any errors but shows up AVC denies messages.


[root@autohv01 log]# date
Wed Apr  5 06:03:29 EDT 2017

[root@autohv01 log]# ipa trust-find
---------------
1 trust matched
---------------
  Realm name: win2k16.test
  Domain NetBIOS name: WIN2K16
  Domain Security Identifier: S-1-5-21-1240829736-1212639629-1557025649
  Trust type: Active Directory domain
----------------------------
Number of entries returned 1
----------------------------

[root@autohv01 log]# ipa trust-fetch-domains win2k16.test
----------------------------------------------------------------------------------------
List of trust domains successfully refreshed. Use trustdomain-find command to list them.
----------------------------------------------------------------------------------------
----------------------------
Number of entries returned 0
----------------------------

time->Wed Apr  5 06:03:35 2017
type=SYSCALL msg=audit(1491386615.761:9355): arch=c000003e syscall=2 success=yes exit=3 a0=4ae83c0 a1=80000 a2=180 a3=2 items=0 ppid=877 pid=28801 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="com.redhat.idm." exe="/usr/bin/python2.7" subj=system_u:system_r:ipa_helper_t:s0 key=(null)
type=AVC msg=audit(1491386615.761:9355): avc:  denied  { open } for  pid=28801 comm="com.redhat.idm." path="/run/ipa/krb5cc_oddjob_trusts" dev="tmpfs" ino=860461 scontext=system_u:system_r:ipa_helper_t:s0 tcontext=system_u:object_r:var_run_t:s0 tclass=file
type=AVC msg=audit(1491386615.761:9355): avc:  denied  { read } for  pid=28801 comm="com.redhat.idm." name="krb5cc_oddjob_trusts" dev="tmpfs" ino=860461 scontext=system_u:system_r:ipa_helper_t:s0 tcontext=system_u:object_r:var_run_t:s0 tclass=file
----
time->Wed Apr  5 06:03:35 2017
type=SYSCALL msg=audit(1491386615.761:9356): arch=c000003e syscall=72 success=yes exit=0 a0=3 a1=7 a2=7ffec15e9440 a3=2 items=0 ppid=877 pid=28801 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="com.redhat.idm." exe="/usr/bin/python2.7" subj=system_u:system_r:ipa_helper_t:s0 key=(null)
type=AVC msg=audit(1491386615.761:9356): avc:  denied  { lock } for  pid=28801 comm="com.redhat.idm." path="/run/ipa/krb5cc_oddjob_trusts" dev="tmpfs" ino=860461 scontext=system_u:system_r:ipa_helper_t:s0 tcontext=system_u:object_r:var_run_t:s0 tclass=file
----
time->Wed Apr  5 06:03:35 2017
type=SYSCALL msg=audit(1491386615.761:9357): arch=c000003e syscall=5 success=yes exit=0 a0=3 a1=7ffec15e9320 a2=7ffec15e9320 a3=24 items=0 ppid=877 pid=28801 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="com.redhat.idm." exe="/usr/bin/python2.7" subj=system_u:system_r:ipa_helper_t:s0 key=(null)
type=AVC msg=audit(1491386615.761:9357): avc:  denied  { getattr } for  pid=28801 comm="com.redhat.idm." path="/run/ipa/krb5cc_oddjob_trusts" dev="tmpfs" ino=860461 scontext=system_u:system_r:ipa_helper_t:s0 tcontext=system_u:object_r:var_run_t:s0 tclass=file

Expected results: Fix avc denied messages.

Additional info:
Comment 2 Alexander Bokovoy 2017-04-05 10:36:28 UTC 
This is to selinux-policy.
Comment 3 Lukas Vrabec 2017-04-05 12:03:19 UTC 
Sudhir, 

/run/ipa/krb5cc_oddjob_trusts has wrong SELinux label. 

Could you run: 
#restorecon -Rv /run/ipa 

To fix SELinux labels and then reproduce the issue? 

Thanks.
Comment 4 Sudhir Menon 2017-04-05 12:48:32 UTC 
Lukas,

I dont see the avc denied message after running restorecon -Rv /run/ipa

===Before running restorecon===
[root@autohv01 ~]# ls -lZ /run/ipa
drwxrwx---. ipaapi ipaapi unconfined_u:object_r:var_run_t:s0 ccaches
-rw-------. root   root   system_u:object_r:var_run_t:s0   krb5cc_oddjob_trusts
-rw-------. root   root   system_u:object_r:var_run_t:s0   krb5cc_oddjob_trusts_fetch
-rw-------. root   root   system_u:object_r:certmonger_var_run_t:s0 renewal.lock
-rw-r--r--. root   root   system_u:object_r:var_run_t:s0   services.list

[root@autohv01 ~]# restorecon -Rv /run/ipa 
restorecon reset /run/ipa context unconfined_u:object_r:var_run_t:s0->unconfined_u:object_r:ipa_var_run_t:s0
restorecon reset /run/ipa/krb5cc_oddjob_trusts_fetch context system_u:object_r:var_run_t:s0->system_u:object_r:ipa_var_run_t:s0
restorecon reset /run/ipa/krb5cc_oddjob_trusts context system_u:object_r:var_run_t:s0->system_u:object_r:ipa_var_run_t:s0
restorecon reset /run/ipa/services.list context system_u:object_r:var_run_t:s0->system_u:object_r:ipa_var_run_t:s0
restorecon reset /run/ipa/renewal.lock context system_u:object_r:certmonger_var_run_t:s0->system_u:object_r:ipa_var_run_t:s0
restorecon reset /run/ipa/ccaches context unconfined_u:object_r:var_run_t:s0->unconfined_u:object_r:ipa_var_run_t:s0
restorecon reset /run/ipa/ccaches/admin context system_u:object_r:httpd_var_run_t:s0->system_u:object_r:ipa_var_run_t:s0
restorecon reset /run/ipa/ccaches/host~client.testreal.test context system_u:object_r:httpd_var_run_t:s0->system_u:object_r:ipa_var_run_t:s0
restorecon reset /run/ipa/ccaches/host~autohv01.testreal.test context system_u:object_r:httpd_var_run_t:s0->system_u:object_r:ipa_var_run_t:s0

===After running restorecon===
[root@autohv01 ~]# ls -lZ /run/ipa
drwxrwx---. ipaapi ipaapi unconfined_u:object_r:ipa_var_run_t:s0 ccaches
-rw-------. root   root   system_u:object_r:ipa_var_run_t:s0 krb5cc_oddjob_trusts
-rw-------. root   root   system_u:object_r:ipa_var_run_t:s0 krb5cc_oddjob_trusts_fetch
-rw-------. root   root   system_u:object_r:ipa_var_run_t:s0 renewal.lock
-rw-r--r--. root   root   system_u:object_r:ipa_var_run_t:s0 services.list
Comment 5 Lukas Vrabec 2017-04-05 13:03:20 UTC 
Looks good. Closing this issue.
Comment 6 Petr Vobornik 2017-04-05 13:32:04 UTC 
But if this is always reproducible, than there is an error somewhere(maybe IPA) - the file had wrong label. 

I have no idea if following is root cause, but looks fishy(different credential caches):

In install/oddjob/com.redhat.idm.trust-fetch-domains:

    if not have_ccache:
        # delete stale ccache and try again
        if os.path.exists(oneway_ccache_name):
            os.unlink(ccache_name)

Where:
    oneway_ccache_name = '/var/run/ipa/krb5cc_oddjob_trusts_fetch'
    ccache_name = '/var/run/ipa/krb5cc_oddjob_trusts'

Introduced in: https://pagure.io/freeipa/c/aad73fad601f576dd83b758f4448839b4e8e87df
      
So Sudhir is this always reproducible? (From description it seems so)
Comment 7 Alexander Bokovoy 2017-04-05 13:37:54 UTC 
These are two different ccaches for different purposes and they should stay this way. The first one is for us accessing a remote AD DC using TDO credential from the trusted forest root domain realm. The second one is for us accessing own LDAP server using cifs/... principal from our own realm.
Comment 8 Sudhir Menon 2017-04-06 06:09:54 UTC 
Petr,
For me this is always reproducible, if i do not run "restorecon -Rv /run/ipa" as mentioned in comment4.
So may be during installation itself the selinux labels should be corrected i.e it should be system_u:object_r:ipa_var_run_t:s0 instead of system_u:object_r:var_run_t:s0
Comment 9 Alexander Bokovoy 2017-04-06 06:58:12 UTC 
/run/ipa is a temporary directory, re-created by tmpfiles.d after every boot. It should have proper labels already.

Sudhir, if you'd reboot the server, what is output of

   ls -laZ /run/ipa
?
Comment 10 Sudhir Menon 2017-04-06 11:53:27 UTC 
Alexander,
Tested this on pristine system and found that the selinux labels are set correctly after reboot and avc denied messages are not seen now

[root@master ipa]# sestatus 
SELinux status:                 enabled
SELinuxfs mount:                /sys/fs/selinux
SELinux root directory:         /etc/selinux
Loaded policy name:             targeted
Current mode:                   permissive
Mode from config file:          permissive
Policy MLS status:              enabled
Policy deny_unknown status:     allowed
Max kernel policy version:      28

--Before reboot--
[root@master ipa]# ls -alZ /run/ipa/
drwx--x--x. root   root   unconfined_u:object_r:var_run_t:s0 .
drwxr-xr-x. root   root   system_u:object_r:var_run_t:s0   ..
drwxrwx---. ipaapi ipaapi unconfined_u:object_r:var_run_t:s0 ccaches
-rw-------. root   root   system_u:object_r:certmonger_var_run_t:s0 renewal.lock
-rw-r--r--. root   root   system_u:object_r:var_run_t:s0   services.list

#systemctl reboot

[root@master ~]# ls -lZa /run/ipa/
drwx--x--x. root   root   system_u:object_r:ipa_var_run_t:s0 .
drwxr-xr-x. root   root   system_u:object_r:var_run_t:s0   ..
drwxrwx---. ipaapi ipaapi system_u:object_r:ipa_var_run_t:s0 ccaches
-rw-------. root   root   system_u:object_r:ipa_var_run_t:s0 renewal.lock
-rw-r--r--. root   root   system_u:object_r:ipa_var_run_t:s0 services.list
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