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https://github.com/mail-in-a-box/mailinabox.git
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73fbcd7fa3
Querying dpkg for each package is slow, and we have way too much output on installation because of it.
133 lines
4.4 KiB
Bash
Executable File
133 lines
4.4 KiB
Bash
Executable File
#!/bin/bash
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# DNS
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# -----------------------------------------------
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# This script installs packages, but the DNS zone files are only
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# created by the /dns/update API in the management server because
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# the set of zones (domains) hosted by the server depends on the
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# mail users & aliases created by the user later.
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source setup/functions.sh # load our functions
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source /etc/mailinabox.conf # load global vars
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# Install the packages.
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#
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# * nsd: The non-recursive nameserver that publishes our DNS records.
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# * ldnsutils: Helper utilities for signing DNSSEC zones.
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# * openssh-client: Provides ssh-keyscan which we use to create SSHFP records.
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echo "Installing nsd (DNS server)..."
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apt_install nsd ldnsutils openssh-client
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# Prepare nsd's configuration.
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mkdir -p /var/run/nsd
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cat > /etc/nsd/nsd.conf << EOF;
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# No not edit. Overwritten by Mail-in-a-Box setup.
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server:
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hide-version: yes
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# identify the server (CH TXT ID.SERVER entry).
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identity: ""
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# The directory for zonefile: files.
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zonesdir: "/etc/nsd/zones"
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# Allows NSD to bind to IP addresses that are not (yet) added to the
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# network interface. This allows nsd to start even if the network stack
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# isn't fully ready, which apparently happens in some cases.
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# See https://www.nlnetlabs.nl/projects/nsd/nsd.conf.5.html.
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ip-transparent: yes
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EOF
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# Since we have bind9 listening on localhost for locally-generated
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# DNS queries that require a recursive nameserver, and the system
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# might have other network interfaces for e.g. tunnelling, we have
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# to be specific about the network interfaces that nsd binds to.
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for ip in $PRIVATE_IP $PRIVATE_IPV6; do
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echo " ip-address: $ip" >> /etc/nsd/nsd.conf;
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done
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echo "include: /etc/nsd/zones.conf" >> /etc/nsd/nsd.conf;
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# Create DNSSEC signing keys.
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mkdir -p "$STORAGE_ROOT/dns/dnssec";
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# TLDs don't all support the same algorithms, so we'll generate keys using a few
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# different algorithms. RSASHA1-NSEC3-SHA1 was possibly the first widely used
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# algorithm that supported NSEC3, which is a security best practice. However TLDs
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# will probably be moving away from it to a a SHA256-based algorithm.
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#
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# Supports `RSASHA1-NSEC3-SHA1` (didn't test with `RSASHA256`):
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#
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# * .info
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# * .me
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#
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# Requires `RSASHA256`
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#
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# * .email
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# * .guide
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#
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# Supports `RSASHA256` (and defaulting to this)
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#
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# * .fund
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FIRST=1 #NODOC
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for algo in RSASHA1-NSEC3-SHA1 RSASHA256; do
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if [ ! -f "$STORAGE_ROOT/dns/dnssec/$algo.conf" ]; then
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if [ $FIRST == 1 ]; then
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echo "Generating DNSSEC signing keys. This may take a few minutes..."
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FIRST=0 #NODOC
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fi
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# Create the Key-Signing Key (KSK) (with `-k`) which is the so-called
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# Secure Entry Point. The domain name we provide ("_domain_") doesn't
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# matter -- we'll use the same keys for all our domains.
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#
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# `ldns-keygen` outputs the new key's filename to stdout, which
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# we're capturing into the `KSK` variable.
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KSK=$(umask 077; cd $STORAGE_ROOT/dns/dnssec; ldns-keygen -a $algo -b 2048 -k _domain_);
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# Now create a Zone-Signing Key (ZSK) which is expected to be
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# rotated more often than a KSK, although we have no plans to
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# rotate it (and doing so would be difficult to do without
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# disturbing DNS availability.) Omit `-k` and use a shorter key length.
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ZSK=$(umask 077; cd $STORAGE_ROOT/dns/dnssec; ldns-keygen -a $algo -b 1024 _domain_);
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# These generate two sets of files like:
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#
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# * `K_domain_.+007+08882.ds`: DS record normally provided to domain name registrar (but it's actually invalid with `_domain_`)
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# * `K_domain_.+007+08882.key`: public key
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# * `K_domain_.+007+08882.private`: private key (secret!)
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# The filenames are unpredictable and encode the key generation
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# options. So we'll store the names of the files we just generated.
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# We might have multiple keys down the road. This will identify
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# what keys are the current keys.
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cat > $STORAGE_ROOT/dns/dnssec/$algo.conf << EOF;
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KSK=$KSK
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ZSK=$ZSK
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EOF
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fi
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# And loop to do the next algorithm...
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done
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# Force the dns_update script to be run every day to re-sign zones for DNSSEC
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# before they expire. When we sign zones (in `dns_update.py`) we specify a
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# 30-day validation window, so we had better re-sign before then.
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cat > /etc/cron.daily/mailinabox-dnssec << EOF;
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#!/bin/bash
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# Mail-in-a-Box
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# Re-sign any DNS zones with DNSSEC because the signatures expire periodically.
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`pwd`/tools/dns_update
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EOF
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chmod +x /etc/cron.daily/mailinabox-dnssec
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# Permit DNS queries on TCP/UDP in the firewall.
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ufw_allow domain
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