# File: certbot_authentication.sh
# Revision: 1.0
# Description: Perform domain validation by creating a TXT record on the domain
-# from certbot. This script is designed to work with
+# from certbot. This script is designed to work with
# Dreamhost.com's API and certbot running on Ubuntu 20.04. Note
# that it has not been extended to handle multiple domains.
#
# (c) Copyright 2021, ClearSCM, Inc., all rights reserved
#
################################################################################
+logfile="/tmp/$(basename $0).log"
+rm -f $logfile
+
+function log {
+ echo $1 >> $logfile
+} # log
+
+log "Starting $0"
+
# The following are environment variables that certbot passes to us
#
-# CERTBOT_DOMAIN: Domain being authenticated. For example,
-# _acme-challenge.example.com for a wildcart cert or
-# _acme-challenge.subdomain.example.com for a subdomain
-# Note: Pass in $1 for testing or use the default of
-# CERTBOT_DOMAIN
-domain=${1:-CERTBOT_DOMAIN}
+# CERTBOT_DOMAIN: Domain being authenticated.
+# CERTBOT_VALIDATION: Validation string for domain.
+#
+# Check that CERTBOT_DOMAIN and CERTBOT_VALIDATION have been passed in properly:
+if [ -z "$CERTBOT_DOMAIN"]; then
+ log "CERTBOT_DOMAIN not passed in!"
+ exit 1
+else
+ log "CERTBOT_DOMAIN = $CERTBOT_DOMAIN"
+fi
-# CERTBOT_VALIDATION: The validation string. Pass in $2 or use the default of
-# CERTBOT_VALIDATION
-value=${2:-CERTBOT_VALIDATION}
+if [ -z "$CERTBOT_VALIDATION"]; then
+ log "CERTBOT_VALIDATION not passed in!"
+ exit 1
+else
+ log "CERTBOT_VALIDATION = $CERTBOT_VALIDATION"
+fi
+# My DNS registar is Dreamhost. These variables are specific to their DNS API.
+# Yours will probably be different.
+#
# Dreamhost key - generate at https://panel.dreamhost.com/?tree=home.api
key=KHY6UJQXD9MEJZHR
# Add a TXT record to domain
function addTXT {
- echo "Adding TXT record $domain = $value)"
- cmd="$url&unique_id=$(uuidgen)&cmd=dns-add_record&record=$domain&type=TXT&value=$value"
-
- response=$(wget -O- -q "$cmd")
-
- echo "$response"
+ log "Adding TXT record $CERTBOT_DOMAIN = $CERTBOT_VALIDATION"
+ cmd="$url&unique_id=$(uuidgen)&cmd=dns-add_record&record=_acme-challenge.$CERTBOT_DOMAIN&type=TXT&value=$CERTBOT_VALIDATION"
+
+ log "cmd = $cmd"
+
+ response=$(wget -O- -q "$cmd")
+
+ log "Response = $response"
} # addTXT
-# Verifies that the TXT record has propogated. Note that this cannot be
-# likewise used for removal of the TXT record, which also needs to propagate.
-# However, we are not concerned with when the removal is propagated, it can
-# do so on its own time
+# Verifies that the TXT record has propogated.
function verifyPropagation {
- # We will try 4 times waiting 5 minutes in between
- max_attempts=4
- time_between_attempts=300
-
- # Obviously it's not propagated immediately so first wait
- attempt=0
- while [ $attempt -lt 4 ]; do
- echo "Waiting 5 minutes for TXT record $domain to propagate..."
- sleep $time_between_attempts
-
- ((attempt++))
- echo "Attempt #$attempt: Validating of propagation of TXT record $domain"
- TXT=$(nslookup -type=TXT $domain | grep -v "can't find" | grep $domain)
-
- if [ -n "$TXT" ]; then
- echo "TXT record $name.$domain propagated"
- return
- else
- echo "TXT record $name.$domain not propagated yet"
- fi
- done
-
- echo "ERROR: Unable to validate propagation"
- exit 1
+ log "Enter verifyPropagation"
+
+ # We will try 4 times waiting 5 minutes in between
+ max_attempts=4
+ time_between_attempts=300 # 5 minutes (we might be able to shorten this)
+
+ # Obviously it's not propagated immediately so first wait
+ attempt=0
+ while [ $attempt -lt 4 ]; do
+ log "Waiting $time_between_attempts seconds for TXT record $CERTBOT_DOMAIN to propagate..."
+ sleep $time_between_attempts
+
+ ((attempt++))
+ log "Attempt #$attempt: Validating of propagation of TXT record $CERTBOT_DOMAIN"
+ TXT=$(nslookup -type=TXT _acme-challenge.$CERTBOT_DOMAIN | grep -vi "can't find" | grep $CERTBOT_DOMAIN)
+
+ if [ -n "$TXT" ]; then
+ log "TXT record _acme-challenge.$CERTBOT_DOMAIN propagated"
+ return
+ else
+ log "TXT record _acme-challenge.$CERTBOT_DOMAIN not propagated yet"
+ fi
+ done
+
+ log "ERROR: Unable to validate propagation"
+ exit 1
} # verifyPropagation
addTXT
verifyPropagation
+
+# If we get here then new certs are produced but need to be made available
+# for importation to the Synology. /System/tmp is a directory that is
+# on the Synology mounted via NFS.
+cp /etc/letsencrypt/live/$CERTBOT_DOMAIN/privkey.pem /System/tmp && chmod 444 /System/tmp/privkey.pem
+cp /etc/letsencrypt/live/$CERTBOT_DOMAIN/cert.pem /System/tmp && chmod 444 /System/tmp/cert.pem
+cp /etc/letsencrypt/live/$CERTBOT_DOMAIN/chain.pem /System/tmp && chmod 444 /System/tmp/chain.pem
+
+echo "Now go to DSM > Control Panel > Security > Certificate, select $CERTBOT_DOMAIN"
+echo "then Add, Replace an existing certificate for *.$CERTBOT_DOMAIN, Import"
+echo "Certificate and supply privkey.pem, cert.pem, and chain.pem for Private Key"
+echo "Certificate, and Intermediate certificate."
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