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I have cloned this bug from this fedora bug:
https://bugzilla.redhat.com/show_bug.cgi?id=1838018
Description of problem:
After the installation of krb5 I added a new user into a krb5 db via the following command "kadmin -p root/admin -w password -q 'ank -pw password alice". The command finished successfully and the reply cache file was created. The problem is that this file had security context: system_u:object_r:kadmind_tmp_t:s0. This is a problem when the ssh via krb5-GSSAPI is used because sshd service cannot write into this file.
Version-Release number of selected component (if applicable):
krb5-server-1.18.2-2.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
2.kadmin.local -r EXAMPLE.COM -q "addprinc -pw passwd root/admin"
3.kadmin.local -r EXAMPLE.COM -q "addprinc -randkey host/fedora.example.com
4.kadmin.local -r EXAMPLE.COM -q "ktadd host/fedora.example.com"
5.kadmin -p root/admin -w password -q 'ank -pw password alice'
Actual results:
# kinit alice
Password for alice:
ssh alice.com pwd
alice.com's password:
Expected results:
# kinit alice
Password for alice:
# ssh alice.com pwd
/home/alice
Additional info:
# ll -Z /var/tmp/krb5_0.rcache2
-rw-------. 1 root root system_u:object_r:kadmind_tmp_t:s0 14656 May 29 05:37 /var/tmp/krb5_0.rcache2
AVC message:
time->Fri May 29 05:31:31 2020
type=AVC msg=audit(1590744691.663:712): avc: denied { write } for pid=21825 comm="sshd" name="krb5_0.rcache2" dev="vda1" ino=9344 scontext=system_u:system_r:sshd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:kadmind_tmp_t:s0 tclass=file permissive=1
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