mirror of
https://github.com/mail-in-a-box/mailinabox.git
synced 2024-12-18 06:37:06 +00:00
79 lines
2.7 KiB
Bash
Executable File
79 lines
2.7 KiB
Bash
Executable File
#!/bin/bash
|
|
# DNS: Configure a DNS server using nsd
|
|
#######################################
|
|
|
|
# This script installs packages, but the DNS zone files are only
|
|
# created by the /dns/update API in the management server because
|
|
# the set of zones (domains) hosted by the server depends on the
|
|
# mail users & aliases created by the user later.
|
|
|
|
source setup/functions.sh # load our functions
|
|
|
|
# Install nsd, our DNS server software, and ldnsutils which helps
|
|
# us sign zones for DNSSEC.
|
|
|
|
# ...but first, we have to create the user because the
|
|
# current Ubuntu forgets to do so in the .deb
|
|
# see issue #25 and https://bugs.launchpad.net/ubuntu/+source/nsd/+bug/1311886
|
|
if id nsd > /dev/null 2>&1; then
|
|
true; #echo "nsd user exists... good";
|
|
else
|
|
useradd nsd;
|
|
fi
|
|
|
|
# Okay now install the packages.
|
|
|
|
apt_install nsd ldnsutils
|
|
|
|
# Prepare nsd's configuration.
|
|
|
|
sudo mkdir -p /var/run/nsd
|
|
|
|
# Create DNSSEC signing keys.
|
|
|
|
mkdir -p "$STORAGE_ROOT/dns/dnssec";
|
|
if [ ! -f "$STORAGE_ROOT/dns/dnssec/keys.conf" ]; then
|
|
echo "Generating DNSSEC signing keys. This may take a few minutes..."
|
|
|
|
# Create the Key-Signing Key (KSK) (-k) which is the so-called
|
|
# Secure Entry Point. Use a NSEC3-compatible algorithm (best
|
|
# practice), and a nice and long keylength. The domain name we
|
|
# provide ("_domain_") doesn't matter -- we'll use the same
|
|
# keys for all our domains.
|
|
KSK=$(umask 077; cd $STORAGE_ROOT/dns/dnssec; ldns-keygen -a RSASHA1-NSEC3-SHA1 -b 2048 -k _domain_);
|
|
|
|
# Now create a Zone-Signing Key (ZSK) which is expected to be
|
|
# rotated more often than a KSK, although we have no plans to
|
|
# rotate it (and doing so would be difficult to do without
|
|
# disturbing DNS availability.) Omit '-k' and use a shorter key.
|
|
ZSK=$(umask 077; cd $STORAGE_ROOT/dns/dnssec; ldns-keygen -a RSASHA1-NSEC3-SHA1 -b 1024 _domain_);
|
|
|
|
# These generate two sets of files like:
|
|
# K_domain_.+007+08882.ds <- DS record for adding to NSD configuration files
|
|
# K_domain_.+007+08882.key <- public key (goes into DS record & upstream DNS provider like your registrar)
|
|
# K_domain_.+007+08882.private <- private key (secret!)
|
|
|
|
# The filenames are unpredictable and encode the key generation
|
|
# options. So we'll store the names of the files we just generated.
|
|
# We might have multiple keys down the road. This will identify
|
|
# what keys are the current keys.
|
|
cat > $STORAGE_ROOT/dns/dnssec/keys.conf << EOF;
|
|
KSK=$KSK
|
|
ZSK=$ZSK
|
|
EOF
|
|
fi
|
|
|
|
# Force the dns_update script to be run every day to re-sign zones for DNSSEC.
|
|
cat > /etc/cron.daily/mailinabox-dnssec << EOF;
|
|
#!/bin/bash
|
|
# Mail-in-a-Box
|
|
# Re-sign any DNS zones with DNSSEC because the signatures expire periodically.
|
|
`pwd`/tools/dns_update
|
|
EOF
|
|
chmod +x /etc/cron.daily/mailinabox-dnssec
|
|
|
|
# Permit DNS queries on TCP/UDP in the firewall.
|
|
|
|
ufw_allow domain
|
|
|