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#!/bin/sh
#
# Build a Kerberos test realm for MIT Kerberos
#
# This script automates the process of setting up a Kerberos test realm from
# scratch suitable for testing pam-krb5. It is primarily intended to be run
# from inside CI in a VM or container from the top of the wallet source tree,
# and must be run as root. It expects to be operating on the Debian MIT
# Kerberos package.
#
# Copyright 2014, 2020 Russ Allbery <eagle@eyrie.org>
#
# SPDX-License-Identifier: MIT
set -eux
# Install the KDC and the OpenSSL command-line tool.
apt-get install krb5-admin-server krb5-kdc krb5-pkinit openssl
# Install its configuration files.
cp ci/files/mit/extensions.client /etc/krb5kdc/extensions.client
cp ci/files/mit/extensions.kdc /etc/krb5kdc/extensions.kdc
cp ci/files/mit/kadm5.acl /etc/krb5kdc/kadm5.acl
cp ci/files/mit/kdc.conf /etc/krb5kdc/kdc.conf
cp ci/files/mit/krb5.conf /etc/krb5.conf
# Add domain-realm mappings for the local host, since otherwise Heimdal and
# MIT Kerberos may attempt to discover the realm of the local domain, and the
# DNS server for GitHub Actions has a habit of just not responding and causing
# the test to hang.
cat <<EOF >>/etc/krb5.conf
[domain_realm]
$(hostname -f) = MIT.TEST
EOF
# Create the basic KDC.
kdb5_util create -s -P 'this is a test master database password'
# Create and store the keytab.
kadmin.local -q 'add_principal +requires_preauth -randkey test/keytab@MIT.TEST'
kadmin.local -q 'ktadd -k tests/config/keytab test/keytab@MIT.TEST'
echo 'test/keytab@MIT.TEST' >tests/config/principal
# Enable anonymous PKINIT.
kadmin.local -q 'addprinc -randkey WELLKNOWN/ANONYMOUS'
# Create the root CA for PKINIT.
openssl genrsa -out /etc/krb5kdc/cakey.pem 2048
openssl req -key /etc/krb5kdc/cakey.pem -new -x509 \
-out /etc/krb5kdc/cacert.pem -subj "/CN=MIT.TEST CA" -days 3650
chmod 755 /etc/krb5kdc
chmod 644 /etc/krb5kdc/cacert.pem
# Create the certificate for the MIT Kerberos KDC.
openssl genrsa -out /var/lib/krb5kdc/kdckey.pem 2048
openssl req -new -out /var/lib/krb5kdc/kdc.req \
-key /var/lib/krb5kdc/kdckey.pem -subj "/CN=MIT.TEST"
REALM=MIT.TEST openssl x509 -req -in /var/lib/krb5kdc/kdc.req \
-CAkey /etc/krb5kdc/cakey.pem -CA /etc/krb5kdc/cacert.pem \
-out /var/lib/krb5kdc/kdc.pem -days 365 \
-extfile /etc/krb5kdc/extensions.kdc -extensions kdc_cert \
-CAcreateserial
rm /var/lib/krb5kdc/kdc.req
# Fix permissions on all the newly-created files.
chmod 644 tests/config/*
# Restart the MIT Kerberos KDC and services.
systemctl stop krb5-kdc krb5-admin-server
systemctl start krb5-kdc krb5-admin-server
# Ensure that the KDC is running.
kinit -n @MIT.TEST
kdestroy
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