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Bug 1857253

Summary: saslauthd cannot write into reply cache (/var/tmp/krb5_0.rcache2) due to security context
Product: Red Hat Enterprise Linux 8 Reporter: Filip Dvorak <fdvorak>
Component: selinux-policyAssignee: Zdenek Pytela <zpytela>
Status: CLOSED DUPLICATE QA Contact: Milos Malik <mmalik>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 8.3CC: fcami, lmiksik, lvrabec, mmalik, mpolovka, plautrba, rcritten, rharwood, ssekidde, zpytela
Target Milestone: rcKeywords: Regression, TestBlocker
Target Release: ---Flags: pm-rhel: mirror+
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2020-07-27 16:17:43 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1842946    

Description Filip Dvorak 2020-07-15 14:31:58 UTC 
Description of problem:

After recent rebase of krb5 (1.17 -> 1.18) in RHEL-8.3.0 saslauthd can not write into krb5cache file /var/tmp/krb5_0.rcache2. The similar issue is here BZ#1841488.

Version-Release number of selected component (if applicable):
selinux-policy-3.14.3-48.el8.noarch
krb5-server-1.18.2-3.el8

How reproducible:

100%

Steps to Reproduce:

1.Configure krb5-server with user admin, "kinit admin"
2.Configure /etc/sysconfig/saslauthd 

MECH=kerberos5
KRB5_KTNAME=/etc/krb5.keytab

3.testsaslauthd -s login -u admin -p pasword

Actual results:

testsaslauthd -s login -u admin -p pasword
0: NO "authentication failed"

AVC message:
time->Sat Jul  4 10:25:12 2020
type=PROCTITLE msg=audit(1593872712.917:1396): proctitle=2F7573722F7362696E2F7361736C6175746864002D6D002F72756E2F7361736C6175746864002D61006B65726265726F7335
type=PATH msg=audit(1593872712.917:1396): item=1 name="/var/tmp/krb5_0.rcache2" inode=134921735 dev=fd:00 mode=0100600 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:smbd_tmp_t:s0 nametype=NORMAL cap_fp=0 cap_fi=0 cap_fe=0 cap_fver=0 cap_frootid=0
type=PATH msg=audit(1593872712.917:1396): item=0 name="/var/tmp/" inode=134299376 dev=fd:00 mode=041777 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:tmp_t:s0 nametype=PARENT cap_fp=0 cap_fi=0 cap_fe=0 cap_fver=0 cap_frootid=0
type=CWD msg=audit(1593872712.917:1396): cwd="/run/saslauthd"

type=SYSCALL msg=audit(1593872712.917:1396): arch=c0000015 syscall=286 success=no exit=-13 a0=ffffffffffffff9c a1=1001afc57c0 a2=8042 a3=180 items=2 ppid=73216 pid=73217 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="saslauthd" exe="/usr/sbin/saslauthd" subj=system_u:system_r:saslauthd_t:s0 key=(null)
type=AVC msg=audit(1593872712.917:1396): avc:  denied  { write } for  pid=73217 comm="saslauthd" name="krb5_0.rcache2" dev="dm-0" ino=134921735 scontext=system_u:system_r:saslauthd_t:s0 tcontext=system_u:object_r:smbd_tmp_t:s0 tclass=file permissive=0

Expected results:
testsaslauthd should work, no AVC
Comment 1 Rob Crittenden 2020-07-15 15:54:36 UTC 
This is affecting IdM test execution. Marking as TestBlocker for IdM and adding Regression based on c#0.
Comment 14 Zdenek Pytela 2020-07-27 16:17:43 UTC 
This bug will be eventually resolved together with other similar bugs.
Closing as a dup of bz#1848953 which contains the most of information.

*** This bug has been marked as a duplicate of bug 1848953 ***