From 633919e97cb638125ae82626bcb0596ca20a498c Mon Sep 17 00:00:00 2001
From: Dario Ernst <dario@kanojo.de>
Date: Wed, 26 Dec 2018 11:42:48 +0100
Subject: [PATCH] Add docker to dump traefiks certificates to pem

This is required since traefik sitting on HTTP is able to grab
LetsEncrypt certificates which then need to be injected into the front
container.
---
 optional/traefik-certdumper/.dockerignore |  2 ++
 optional/traefik-certdumper/Dockerfile    |  8 ++++++
 optional/traefik-certdumper/LICENSE       | 21 ++++++++++++++++
 optional/traefik-certdumper/README.md     | 27 ++++++++++++++++++++
 optional/traefik-certdumper/run.sh        | 30 +++++++++++++++++++++++
 5 files changed, 88 insertions(+)
 create mode 100644 optional/traefik-certdumper/.dockerignore
 create mode 100644 optional/traefik-certdumper/Dockerfile
 create mode 100644 optional/traefik-certdumper/LICENSE
 create mode 100644 optional/traefik-certdumper/README.md
 create mode 100755 optional/traefik-certdumper/run.sh

diff --git a/optional/traefik-certdumper/.dockerignore b/optional/traefik-certdumper/.dockerignore
new file mode 100644
index 00000000..9b54c5ba
--- /dev/null
+++ b/optional/traefik-certdumper/.dockerignore
@@ -0,0 +1,2 @@
+README.md
+Dockerfile
diff --git a/optional/traefik-certdumper/Dockerfile b/optional/traefik-certdumper/Dockerfile
new file mode 100644
index 00000000..c8a3aa3f
--- /dev/null
+++ b/optional/traefik-certdumper/Dockerfile
@@ -0,0 +1,8 @@
+FROM alpine
+
+RUN apk --no-cache add inotify-tools jq openssl util-linux bash docker
+# while not strictly documented, this script seems to always(?) support previous acme.json versions too
+RUN wget https://raw.githubusercontent.com/containous/traefik/master/contrib/scripts/dumpcerts.sh -O dumpcerts.sh
+
+COPY run.sh /
+ENTRYPOINT ["/run.sh"]
diff --git a/optional/traefik-certdumper/LICENSE b/optional/traefik-certdumper/LICENSE
new file mode 100644
index 00000000..259ccd34
--- /dev/null
+++ b/optional/traefik-certdumper/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018 Sven Dowideit
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/optional/traefik-certdumper/README.md b/optional/traefik-certdumper/README.md
new file mode 100644
index 00000000..f5434f62
--- /dev/null
+++ b/optional/traefik-certdumper/README.md
@@ -0,0 +1,27 @@
+# Single-domain traefik-certdumper for mailu
+
+This is based on the work by Sven Dowideit on https://github.com/SvenDowideit/traefik-certdumper
+
+## Fork?
+This is a slight modification that is less flexible, but is adapted to the
+usecase in mailu. If you wish to deploy mailu behind a traefik, you face many
+problems. One of these is that you need to get the certificates into mailu in a
+very defined manner. This will copy the certificate for the **Main:**-domain
+given in the DOMAIN-environment onto `output`.
+
+If your output happens to be mailu-front-`/certs`, the certificate-watcher in
+the front-container will catch it and reload nginx. This works for mailu
+`TLS_FLAVOR=[mail, cert]`
+
+
+```
+  certdumper:
+    restart: always
+    image: Mailu/traefik-certdumper:$VERSION
+    environment:
+      - DOMAIN=$DOMAIN
+    volumes:
+      # your traefik data-volume is probably declared outside of the mailu composefile
+      - /data/traefik:/traefik
+      - $ROOT/certs/:/output/
+```
diff --git a/optional/traefik-certdumper/run.sh b/optional/traefik-certdumper/run.sh
new file mode 100755
index 00000000..2f73eaf7
--- /dev/null
+++ b/optional/traefik-certdumper/run.sh
@@ -0,0 +1,30 @@
+#!/bin/bash
+
+function dump() {
+    echo "$(date) Dumping certificates"
+    bash dumpcerts.sh /traefik/acme.json /tmp/work/
+
+    for crt_file in $(ls /tmp/work/certs/*); do
+        pem_file=$(echo $crt_file | sed 's/certs/pem/g' | sed 's/.crt/-public.pem/g')
+        echo "openssl x509 -inform PEM -in $crt_file > $pem_file"
+        openssl x509 -inform PEM -in $crt_file > $pem_file
+    done
+    for key_file in $(ls /tmp/work/private/*); do
+        pem_file=$(echo $key_file | sed 's/private/pem/g' | sed 's/.key/-private.pem/g')
+        echo "openssl rsa -in $key_file -text > $pem_file"
+        openssl rsa -in $key_file -text > $pem_file
+    done
+
+    echo "$(date) Copying certificates"
+    cp -v /tmp/work/pem/${DOMAIN}-private.pem /output/key.pem
+    cp -v /tmp/work/pem/${DOMAIN}-public.pem /output/cert.pem
+}
+
+mkdir -p /tmp/work/pem /tmp/work/certs
+# run once on start to make sure we have any old certs
+dump
+
+while true; do
+    inotifywait -e modify /traefik/acme.json && \
+        dump
+done