#!/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 user programs.
apt-get install krb5-admin-server krb5-kdc krb5-user

# Install its configuration files.
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/wallet@MIT.TEST'
kadmin.local -q 'ktadd -k tests/config/keytab test/wallet@MIT.TEST'
echo 'test/wallet@MIT.TEST' >tests/config/principal

# Create a user principal with a known password.
password="iceedKaicVevjunwiwyd"
kadmin.local -q \
    "add_principal +requires_preauth -pw $password testuser@MIT.TEST"
echo 'testuser@MIT.TEST' >tests/config/password
echo "$password" >>tests/config/password

# Copy some of those files to the Perl test suite.
cp tests/config/keytab perl/t/data/test.keytab
cp tests/config/principal perl/t/data/test.principal
echo 'MIT.TEST' >perl/t/data/test.realm
echo 'MIT' >perl/t/data/test.krbtype

# Fix permissions on all the newly-created files.
chmod 644 tests/config/* perl/t/data/test.*

# 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.
for n in $(seq 1 5); do
    if echo "$password" | kinit testuser@MIT.TEST; then
        break
    fi
    sleep 1
done
klist
kdestroy