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https://github.com/laurivosandi/certidude
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Add OpenWrt/LEDE integration script
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doc/50-certidude
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197
doc/50-certidude
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#!/bin/sh
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# To paste, press Ctrl-D to finish: cat > /etc/hotplug.d/iface/50-certidude
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# To test: ACTION=ifup INTERFACE=wan sh /etc/hotplug.d/iface/50-certidude
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# TODO: renewal
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[ $ACTION == "ifup" ] || exit 0
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[ $INTERFACE == "wan" ] || exit 0
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# TODO: iterate over all authorities
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AUTHORITY=certidude.@authority[0]
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URL=$(uci get $AUTHORITY.url)
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GATEWAY=$(uci get $AUTHORITY.gateway)
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COMMON_NAME=$(uci get $AUTHORITY.common_name)
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if [ $? -ne 0 ]; then
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COMMON_NAME=$(uci get system.@system[0].hostname)
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fi
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KEY_PATH=$(uci get $AUTHORITY.key_path)
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KEY_TYPE=$(uci get $AUTHORITY.key_type)
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KEY_LENGTH=$(uci get $AUTHORITY.key_length)
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CERTIFICATE_PATH=$(uci get $AUTHORITY.certificate_path)
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REQUEST_PATH=$(uci get $AUTHORITY.request_path)
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AUTHORITY_PATH=$(uci get $AUTHORITY.authority_path)
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RED_LED=/sys/class/leds/$(uci get $AUTHORITY.red_led)
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GREEN_LED=/sys/class/leds/$(uci get $AUTHORITY.green_led)
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NTP_SERVERS=$(uci get system.ntp.server)
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logger -t certidude -s "Fetching time from NTP servers: $NTP_SERVERS"
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ntpd -q -n -d -p $NTP_SERVERS
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logger -t certidude -s "Time is now: $(date)"
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# If certificate file is there assume everything's set up
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if [ -f $CERTIFICATE_PATH ]; then
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SERIAL=$(openssl x509 -in $CERTIFICATE_PATH -noout -serial | cut -d "=" -f 2 | tr [A-F] [a-f])
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logger -t certidude -s "Certificate with serial $SERIAL already exists, attempting to bring up IPsec tunnel..."
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ipsec up client-to-site
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exit 0
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fi
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# Turn green off and red on
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if [ -d $GREEN_LED ] && [ -d $RED_LED ]; then
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echo timer > $GREEN_LED/trigger
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echo 100 | tee $GREEN_LED/delay_*
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echo none > $RED_LED/trigger
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fi
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#########################################
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### Generate private key if necessary ###
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#########################################
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if [ ! -f $KEY_PATH ]; then
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KEY_TEMP=$(mktemp -u)
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logger -t certidude -s "Generating RSA key for IPsec..."
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if [ -d $GREEN_LED ]; then
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echo 250 | tee $GREEN_LED/delay_*
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fi
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openssl gen$KEY_TYPE -out $KEY_TEMP $KEY_LENGTH
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chmod 0600 $KEY_TEMP
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mv $KEY_TEMP $KEY_PATH
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fi
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############################
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### Fetch CA certificate ###
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############################
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if [ ! -f $AUTHORITY_PATH ]; then
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AUTHORITY_TEMP=$(mktemp -u)
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logger -t certidude -s "Fetching CA certificate from $URL/api/certificate/"
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curl -f -s $URL/api/certificate/ > $AUTHORITY_TEMP
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if [ $? -ne 0 ]; then
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logger -t certidude -s "Failed to receive CA certificate, server responded: $(cat $AUTHORITY_TEMP)"
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if [ -d $GREEN_LED ] && [ -d $RED_LED ]; then
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echo none > $GREEN_LED/trigger
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echo timer > $RED_LED/trigger
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echo 100 | tee $RED_LED/delay_*
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fi
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exit 10
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fi
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openssl x509 -in $AUTHORITY_TEMP -noout
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if [ $? -ne 0 ]; then
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logger -t certidude -s "Received invalid CA certificate"
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if [ -d $GREEN_LED ] && [ -d $RED_LED ]; then
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echo none > $GREEN_LED/trigger
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echo timer > $RED_LED/trigger
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echo 250 | tee $RED_LED/delay_*
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fi
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exit 11
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fi
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mv $AUTHORITY_TEMP $AUTHORITY_PATH
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fi
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logger -t certidude -s "CA certificate md5sum: $(md5sum -b $AUTHORITY_PATH)"
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#####################################
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### Generate request if necessary ###
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#####################################
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if [ ! -f $REQUEST_PATH ]; then
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REQUEST_TEMP=$(mktemp -u)
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openssl req -new -sha256 -key $KEY_PATH -out $REQUEST_TEMP -subj "/CN=$COMMON_NAME"
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mv $REQUEST_TEMP $REQUEST_PATH
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fi
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logger -t certidude -s "Request md5sum is $(md5sum -b $REQUEST_PATH)"
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# Wait for certificate
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if [ -d $GREEN_LED ]; then
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echo 500 | tee $GREEN_LED/delay_*
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fi
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CERTIFICATE_TEMP=$(mktemp -u)
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curl -f -L \
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-H "Content-Type: application/pkcs10" \
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--data-binary @$REQUEST_PATH \
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$URL/api/request/?autosign=true\&wait=yes > $CERTIFICATE_TEMP
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# TODO: Loop until we get exitcode 0
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# TODO: Use backoff time $((2\*X))
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if [ $? -ne 0 ]; then
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echo "Failed to fetch certificate"
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if [ -d $GREEN_LED ] && [ -d $RED_LED ]; then
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echo none > $GREEN_LED/trigger
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echo timer > $RED_LED/trigger
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echo 500 | tee $RED_LED/delay_*
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fi
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exit 21
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fi
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# Verify certificate
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openssl verify -CAfile $AUTHORITY_PATH $CERTIFICATE_TEMP
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if [ $? -ne 0 ]; then
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logger -t certidude -s "Received bogus certificate!"
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if [ -d $GREEN_LED ] && [ -d $RED_LED ]; then
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echo none > $GREEN_LED/trigger
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echo timer > $RED_LED/trigger
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echo 1000 | tee $RED_LED/delay_*
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fi
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exit 22
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fi
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logger -t certidude -s "Certificate md5sum: $(md5sum -b $CERTIFICATE_TEMP)"
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###################################
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### Generate /etc/ipsec.secrets ###
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###################################
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SECRETS_TEMP=$(mktemp -u)
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for filename in /etc/ipsec.d/private/*.pem; do
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echo ": RSA $filename" >> $SECRETS_TEMP
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done
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uci commit
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mv $SECRETS_TEMP /etc/ipsec.secrets
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mv $IPSEC_TEMP /etc/ipsec.conf
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mv $CERTIFICATE_TEMP $CERTIFICATE_PATH
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# Enable services
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/etc/init.d/ipsec enable
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# Restart services
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/etc/init.d/ipsec restart
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sleep 2
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ipsec up client-to-site
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