Merge pull request #1410 from jitsi/letsencrypt-script

Adds a script which install certificates from let's encrypt.

debian/jitsi-meet-web-config.postinst

             # SSL for nginx
             db_get jitsi-meet/cert-choice
             CERT_CHOICE="$RET"
-            UPLOADED_CERT_CHOICE="A certificate is available and the files are uploaded on the server"
+            UPLOADED_CERT_CHOICE="I want to use my own certificate"
 
             if [ "$CERT_CHOICE" = "$UPLOADED_CERT_CHOICE" ] ; then
                 db_set jitsi-meet/cert-path-key "/etc/ssl/$JVB_HOSTNAME.key"
             invoke-rc.d apache2 reload
         fi
 
+        echo "----------------"
+        echo ""
+        echo "You can now switch to a Let’s Encrypt certificate. To do so, execute:"
+        echo "/usr/share/jitsi-meet/scripts/install-letsencrypt-cert.sh"
+        echo ""
+        echo "----------------"
+
         # and we're done with debconf
         db_stop
     ;;

debian/jitsi-meet-web-config.templates

 Template: jitsi-meet/cert-choice
 Type: select
-__Choices: Self-signed certificate will be generated, A certificate is available and the files are uploaded on the server
+__Choices: Generate a new self-signed certificate (You will later get a chance to obtain a Let's encrypt certificate), I want to use my own certificate
 _Description: SSL certificate for the Jitsi Meet instance
  Jitsi Meet is best to be set up with an SSL certificate.
  Having no certificate, a self-signed one will be generated.
+ By choosing self-signed you will later have a chance to install Let’s Encrypt certificates.
  Having a certificate signed by a recognised CA, it can be uploaded on the server
  and point its location. The default filenames will be /etc/ssl/--domain.name--.key
  for the key and /etc/ssl/--domain.name--.crt for the certificate.

debian/jitsi-meet-web.install

 images					/usr/share/jitsi-meet/
 lang					/usr/share/jitsi-meet/
 connection_optimization	/usr/share/jitsi-meet/
+resources/*.sh			/usr/share/jitsi-meet/scripts/

debian/po/templates.pot

 #. Type: select
 #. Choices
 #: ../jitsi-meet-web-config.templates:1001
-msgid "Self-signed certificate will be generated"
+msgid "Generate a new self-signed certificate (You will later get a chance to obtain a Let's encrypt certificate)"
 msgstr ""
 
 #. Type: select
 #. Choices
 #: ../jitsi-meet-web-config.templates:1001
-msgid "A certificate is available and the files are uploaded on the server"
+msgid "I want to use my own certificate"
 msgstr ""
 
 #. Type: select

resources/install-letsencrypt-cert.sh

+#!/bin/bash
+
+set -e
+
+DEB_CONF_RESULT=`debconf-show jitsi-meet-web-config | grep jvb-hostname`
+DOMAIN="${DEB_CONF_RESULT##*:}"
+# remove whitespace
+DOMAIN="$(echo -e "${DOMAIN}" | tr -d '[:space:]')"
+
+echo "-------------------------------------------------------------------------"
+echo "This script will:"
+echo "- Need a working DNS record pointing to this machine(for domain ${DOMAIN})"
+echo "- Download certbot-auto from https://dl.eff.org to /usr/local/sbin"
+echo "- Install additional dependencies in order to request Let’s Encrypt certificate"
+echo "- If running with jetty serving web content, will stop Jitsi Videobridge"
+echo "- Configure and reload nginx or apache2, whichever is used"
+echo ""
+echo "You need to agree to the ACME server's Subscriber Agreement (https://letsencrypt.org/documents/LE-SA-v1.1.1-August-1-2016.pdf) "
+echo "by providing an email address for important account notifications"
+
+echo -n "Enter your email and press [ENTER]: "
+read EMAIL
+
+cd /usr/local/sbin
+
+if [ ! -f certbot-auto ] ; then
+  wget https://dl.eff.org/certbot-auto
+  chmod a+x ./certbot-auto
+fi
+
+CRON_FILE="/etc/cron.weekly/letsencrypt-renew"
+echo "#!/bin/bash" > $CRON_FILE
+echo "/usr/local/sbin/certbot-auto renew >> /var/log/le-renew.log" >> $CRON_FILE
+
+CERT_KEY="/etc/letsencrypt/live/$DOMAIN/privkey.pem"
+CERT_CRT="/etc/letsencrypt/live/$DOMAIN/fullchain.pem"
+
+if [ -f /etc/nginx/sites-enabled/$DOMAIN.conf ] ; then
+
+    ./certbot-auto certonly --noninteractive \
+    --webroot --webroot-path /usr/share/jitsi-meet \
+    -d $DOMAIN \
+    --agree-tos --email $EMAIL
+
+    echo "Configuring nginx"
+
+    CONF_FILE="/etc/nginx/sites-available/$DOMAIN.conf"
+    CERT_KEY_ESC=$(echo $CERT_KEY | sed 's/\./\\\./g')
+    CERT_KEY_ESC=$(echo $CERT_KEY_ESC | sed 's/\//\\\//g')
+    sed -i "s/ssl_certificate_key\ \/etc\/jitsi\/meet\/.*key/ssl_certificate_key\ $CERT_KEY_ESC/g" \
+        $CONF_FILE
+    CERT_CRT_ESC=$(echo $CERT_CRT | sed 's/\./\\\./g')
+    CERT_CRT_ESC=$(echo $CERT_CRT_ESC | sed 's/\//\\\//g')
+    sed -i "s/ssl_certificate\ \/etc\/jitsi\/meet\/.*crt/ssl_certificate\ $CERT_CRT_ESC/g" \
+        $CONF_FILE
+
+    echo "service nginx reload" >> $CRON_FILE
+    service nginx reload
+
+elif [ -f /etc/apache2/sites-enabled/$DOMAIN.conf ] ; then
+
+    ./certbot-auto certonly --noninteractive \
+    --webroot --webroot-path /usr/share/jitsi-meet \
+    -d $DOMAIN \
+    --agree-tos --email $EMAIL
+
+    echo "Configuring apache2"
+
+    CONF_FILE="/etc/apache2/sites-available/$DOMAIN.conf"
+    CERT_KEY_ESC=$(echo $CERT_KEY | sed 's/\./\\\./g')
+    CERT_KEY_ESC=$(echo $CERT_KEY_ESC | sed 's/\//\\\//g')
+    sed -i "s/SSLCertificateKeyFile\ \/etc\/jitsi\/meet\/.*key/SSLCertificateKeyFile\ $CERT_KEY_ESC/g" \
+        $CONF_FILE
+    CERT_CRT_ESC=$(echo $CERT_CRT | sed 's/\./\\\./g')
+    CERT_CRT_ESC=$(echo $CERT_CRT_ESC | sed 's/\//\\\//g')
+    sed -i "s/SSLCertificateFile\ \/etc\/jitsi\/meet\/.*crt/SSLCertificateFile\ $CERT_CRT_ESC/g" \
+        $CONF_FILE
+
+    echo "service apache2 reload" >> $CRON_FILE
+    service apache2 reload
+else
+    service jitsi-videobridge stop
+
+    ./certbot-auto certonly --noninteractive \
+    --standalone \
+    -d $DOMAIN \
+    --agree-tos --email $EMAIL
+
+    echo "Configuring jetty"
+
+    CERT_P12="/etc/jitsi/videobridge/$DOMAIN.p12"
+    CERT_JKS="/etc/jitsi/videobridge/$DOMAIN.jks"
+    # create jks from  certs
+    openssl pkcs12 -export \
+        -in $CERT_CRT -inkey $CERT_KEY -passout pass:changeit > $CERT_P12
+    keytool -importkeystore -destkeystore $CERT_JKS \
+        -srckeystore $CERT_P12 -srcstoretype pkcs12 \
+        -noprompt -storepass changeit -srcstorepass changeit
+
+    service jitsi-videobridge start
+
+fi
+
+# the cron file that will renew certificates
+chmod a+x $CRON_FILE