From a34b13a9ba3a11721a3adf2ae5325bf260a56c42 Mon Sep 17 00:00:00 2001
From: Matthew Saunders Brown <matthewsaundersbrown@gmail.com>
Date: Tue, 26 Mar 2024 15:09:12 -0700
Subject: [PATCH] new bin/letsencrypt-add.sh

---
 bin/letsencrypt-add.sh | 126 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100755 bin/letsencrypt-add.sh

diff --git a/bin/letsencrypt-add.sh b/bin/letsencrypt-add.sh
new file mode 100755
index 0000000..dd66f71
--- /dev/null
+++ b/bin/letsencrypt-add.sh
@@ -0,0 +1,126 @@
+#!/bin/bash
+#
+# letsencrypt-tools
+# https://git.stack-source.com/msb/letsencrypt-tools
+# Copyright (c) 2024 Matthew Saunders Brown <matthewsaundersbrown@gmail.com>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+#
+# must be root
+if [ "$USER" != "root" ]; then
+  exec sudo -u root $0 $@
+fi
+
+help()
+{
+  thisfilename=$(basename -- "$0")
+  echo "$thisfilename"
+  echo "Create a Let's Encrypt certificate and enable dovecot/apache configs."
+  echo ""
+  echo "Usage: $thisfilename domain -d <domain> [-t] [-n] [-h]"
+  echo ""
+  echo "  -h          Print this help."
+  echo "  -d <domain> Domain (hostname) to create certificate for."
+  exit
+}
+
+# set options
+while getopts "hd:" opt; do
+  case "${opt}" in
+    h )
+      help
+      exit;;
+    d ) # domain name (hostname) to create cert for
+      domain=${OPTARG,,}
+      # basic but good enough domain name regex validation
+      if [[ ! $domain =~ ^(([a-zA-Z](-?[a-zA-Z0-9])*)\.)+[a-zA-Z]{2,}$ ]] ; then
+        echo "ERROR: Invalid domain name: $1"
+        exit 1
+      fi
+      ;;
+    \? )
+      echo "Invalid option: $OPTARG" 1>&2
+      exit;;
+    : )
+      echo "Invalid option: $OPTARG requires an argument" 1>&2
+      exit;;
+  esac
+done
+
+# check for domain (hostname)
+if [[ -z $domain ]]; then
+  echo "domain (hostname) is required"
+  exit 1
+fi
+
+# check for existing pem file
+if [[ -f /etc/ssl/letsencrypt/$domain.pem ]]; then
+  echo "pem file for $domain already exists"
+  exit 1
+fi
+
+# check that letsencrypt-deploy.path is enabled
+if [[ ! systemctl --quiet is-enabled letsencrypt-deploy.path ]]; then
+  echo "letsencrypt-deploy.path is not enabled."
+  exit 1
+fi
+
+dnscheck=false
+ips=(`ip -4  -o addr show | awk '{ print $4 }' | cut -d / -f 1`)
+
+# check dns for domain
+dns=`host -t A $domain|grep 'has address'|awk '{ print $4 }'`
+if [[ " ${ips[@]} " =~ " ${dns} " ]]; then
+  command="$command -d $domain"
+  dnscheck=true
+fi
+
+# check dns for www subdomain
+dns=`host -t A www.$domain|grep 'has address'|awk '{ print $4 }'`
+if [[ " ${ips[@]} " =~ " ${dns} " ]]; then
+  command="$command -d www.$domain"
+  dnscheck=true
+fi
+
+# copy above www subdomain section and modify as desired to
+# automatically check for and add additional subdomains to cert
+
+# check common additional mail subdomains
+if [[ $domain = mail.* ]]; then
+  # check for imap subdomain
+  dns=`host -t A ${domain/mail./imap.}|grep 'has address'|awk '{ print $4 }'`
+  if [[ " ${ips[@]} " =~ " ${dns} " ]]; then
+    command="$command -d ${domain/mail./imap.}"
+    dnscheck=true
+  fi
+  # check for smtp subdomain
+  dns=`host -t A ${domain/mail./smtp.}|grep 'has address'|awk '{ print $4 }'`
+  if [[ " ${ips[@]} " =~ " ${dns} " ]]; then
+    command="$command -d ${domain/mail./smtp.}"
+    dnscheck=true
+  fi
+  # check for pop subdomain
+  dns=`host -t A ${domain/mail./pop.}|grep 'has address'|awk '{ print $4 }'`
+  if [[ " ${ips[@]} " =~ " ${dns} " ]]; then
+    command="$command -d ${domain/mail./pop.}"
+    dnscheck=true
+  fi
+fi
+
+# check if any of the dns lookups passed
+if [[ "$dnscheck" = "false" ]]; then
+  echo "All dns checks failed, can't create cert."
+  exit 1
+else
+  # check for letsencrypt-deploy.path dir
+  # should be redundant as we already checked if letsencrypt-deploy.path is running
+  # and letsencrypt-deploy.path ensures dir exists
+  if [[ -d /var/tmp/letsencrypt/ ]]; then
+    # touch file, letsencrypt-deploy.path will take care of the rest
+    touch /var/tmp/letsencrypt/$domain
+    echo "Task handed off to Let's Encrypt Deploy, cert should be created and enabled in less than a minute."
+  else
+    echo "Let's Encrypt Deploy path dir does not exist."
+    echo "There is an issue with letsencrypt-deploy.path."
+    exit 1
+  fi
+fi