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Bug 1863043

Summary: kadmind doesn't have an access to /var/tmp/krb5_0.rcache2 when selinux label is set to krb5_host_rcache_t
Product: Red Hat Enterprise Linux 8 Reporter: Filip Dvorak <fdvorak>
Component: selinux-policyAssignee: Zdenek Pytela <zpytela>
Status: CLOSED ERRATA QA Contact: Milos Malik <mmalik>
Severity: medium Docs Contact:
Priority: medium    
Version: 8.3CC: lvrabec, mmalik, plautrba, ssekidde
Target Milestone: rcKeywords: AutoVerified
Target Release: 8.3Flags: pm-rhel: mirror+
Hardware: Unspecified   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2020-11-04 01:57:16 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:

Description Filip Dvorak 2020-08-03 14:26:52 UTC 
Description of problem:
According to BZ#1855770 (comment#3) the default label for the replaycache will be set to "krb5_host_rcache_t" but with this label the kadmind doesn't have an acces to replay cache and therefore the remote access to the KDC database via kadmin fails.

Version-Release number of selected component (if applicable):
RHEL-8.3
# rpm -qa | grep -e krb5 -e selinux-policy
selinux-policy-targeted-3.14.3-49.el8.noarch
selinux-policy-3.14.3-49.el8.noarch
krb5-server-1.18.2-3.el8.x86_64
krb5-workstation-1.18.2-3.el8.x86_64
krb5-libs-1.18.2-3.el8.x86_64


How reproducible:
Always

Steps to Reproduce:
1. Install and configure krb5kdc and kadmin

hostnamectl set-hostname kerberos.example.com
sed -i "1i 127.0.0.1 kerberos.example.com" /etc/hosts
echo -ne '[realms]\nEXAMPLE.COM = {\n    kdc = kerberos.example.com\n    admin_server = kerberos.example.com\n}\n\n[domain_realm]\n.example.com = EXAMPLE.COM\nexample.com = example.com\n' > /etc/krb5.conf.d/example_com
sed -i "s/^# default_realm/ default_realm/" /etc/krb5.conf
echo -ne "passwd\npasswd\n" | kdb5_util create -s
systemctl start krb5kdc kadmin
 
kadmin.local -r EXAMPLE.COM -q "addprinc -pw passwd root/admin"
kadmin.local -r EXAMPLE.COM -q "addprinc -randkey host/localhost
kadmin.local -r EXAMPLE.COM -q "ktadd host/localhost"
kadmin.local -r EXAMPLE.COM -q "ank -pw passwd bob"
kadmin.local -r EXAMPLE.COM -q "ank -pw passwd bob/admin"

2. set KerberosAuthentication and KerberosTicketCleanup in /ets/sshd_config to yes
3. echo passwd | kinit bob
4. ssh bob.com
5. chcon -t krb5_host_rcache_t /var/tmp/krb5_0.rcache2


Actual results:
# kadmin -p bob/admin
Authenticating as principal bob/admin with password.
Password for bob/admin: 
kadmin: GSS-API (or Kerberos) error while initializing kadmin interface

Expected results:
[root@kerberos ~]# kadmin -p bob/admin
Authenticating as principal bob/admin with password.
Password for bob/admin: 
kadmin:  

Additional info:
AVC:
time->Mon Aug  3 10:08:18 2020
type=PROCTITLE msg=audit(1596463698.887:694): proctitle=2F7573722F7362696E2F6B61646D696E64002D50002F7661722F72756E2F6B61646D696E642E706964
type=SYSCALL msg=audit(1596463698.887:694): arch=c000003e syscall=257 success=no exit=-13 a0=ffffff9c a1=55c2a02ed0c0 a2=20042 a3=180 items=0 ppid=1 pid=7534 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="kadmind" exe="/usr/sbin/kadmind" subj=system_u:system_r:kadmind_t:s0 key=(null)
type=AVC msg=audit(1596463698.887:694): avc:  denied  { write } for  pid=7534 comm="kadmind" name="krb5_0.rcache2" dev="vda1" ino=6717156 scontext=system_u:system_r:kadmind_t:s0 tcontext=system_u:object_r:krb5_host_rcache_t:s0 tclass=file permissive=0
Comment 2 Zdenek Pytela 2020-08-03 15:02:18 UTC 
I've submitted a Fedora PR to address the issue:
https://github.com/fedora-selinux/selinux-policy-contrib/pull/319
Comment 13 errata-xmlrpc 2020-11-04 01:57:16 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (selinux-policy bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:4528