Use DNS-01 challenge with certbot

3 files changed, 177 insertions, 9 deletions

diff --git a/templates/ingress/acme-dns-auth.py b/templates/ingress/acme-dns-auth.py
new file mode 100755
index 0000000..77928e6
--- /dev/null
+++ b/templates/ingress/acme-dns-auth.py
@@ -0,0 +1,170 @@
+#!/usr/bin/env python3
+#
+# Source: https://github.com/joohoi/acme-dns-certbot-joohoi/blob/master/acme-dns-auth.py
+# Some modifications to configuration values present.
+
+
+import json
+import os
+import sys
+
+import requests
+
+### EDIT THESE: Configuration values ###
+
+# URL to acme-dns instance
+ACMEDNS_URL = "https://auth.acme-dns.io"
+# Path for acme-dns credential storage
+STORAGE_PATH = "/usr/local/etc/letsencrypt/acmedns.json"
+# Whitelist for address ranges to allow the updates from
+# Example: ALLOW_FROM = ["192.168.10.0/24", "::1/128"]
+ALLOW_FROM = []
+# Force re-registration. Overwrites the already existing acme-dns accounts.
+FORCE_REGISTER = False
+
+###   DO NOT EDIT BELOW THIS POINT   ###
+###         HERE BE DRAGONS          ###
+
+DOMAIN = os.environ["CERTBOT_DOMAIN"]
+if DOMAIN.startswith("*."):
+    DOMAIN = DOMAIN[2:]
+VALIDATION_DOMAIN = "_acme-challenge." + DOMAIN
+VALIDATION_TOKEN = os.environ["CERTBOT_VALIDATION"]
+
+
+class AcmeDnsClient(object):
+    """
+    Handles the communication with ACME-DNS API
+    """
+
+    def __init__(self, acmedns_url):
+        self.acmedns_url = acmedns_url
+
+    def register_account(self, allowfrom):
+        """Registers a new ACME-DNS account"""
+
+        if allowfrom:
+            # Include whitelisted networks to the registration call
+            reg_data = {"allowfrom": allowfrom}
+            res = requests.post(
+                self.acmedns_url + "/register", data=json.dumps(reg_data)
+            )
+        else:
+            res = requests.post(self.acmedns_url + "/register")
+        if res.status_code == 201:
+            # The request was successful
+            return res.json()
+        else:
+            # Encountered an error
+            msg = (
+                "Encountered an error while trying to register a new acme-dns "
+                "account. HTTP status {}, Response body: {}"
+            )
+            print(msg.format(res.status_code, res.text))
+            sys.exit(1)
+
+    def update_txt_record(self, account, txt):
+        """Updates the TXT challenge record to ACME-DNS subdomain."""
+        update = {"subdomain": account["subdomain"], "txt": txt}
+        headers = {
+            "X-Api-User": account["username"],
+            "X-Api-Key": account["password"],
+            "Content-Type": "application/json",
+        }
+        res = requests.post(
+            self.acmedns_url + "/update", headers=headers, data=json.dumps(update)
+        )
+        if res.status_code == 200:
+            # Successful update
+            return
+        else:
+            msg = (
+                "Encountered an error while trying to update TXT record in "
+                "acme-dns. \n"
+                "------- Request headers:\n{}\n"
+                "------- Request body:\n{}\n"
+                "------- Response HTTP status: {}\n"
+                "------- Response body: {}"
+            )
+            s_headers = json.dumps(headers, indent=2, sort_keys=True)
+            s_update = json.dumps(update, indent=2, sort_keys=True)
+            s_body = json.dumps(res.json(), indent=2, sort_keys=True)
+            print(msg.format(s_headers, s_update, res.status_code, s_body))
+            sys.exit(1)
+
+
+class Storage(object):
+    def __init__(self, storagepath):
+        self.storagepath = storagepath
+        self._data = self.load()
+
+    def load(self):
+        """Reads the storage content from the disk to a dict structure"""
+        data = dict()
+        filedata = ""
+        try:
+            with open(self.storagepath, "r") as fh:
+                filedata = fh.read()
+        except IOError as e:
+            if os.path.isfile(self.storagepath):
+                # Only error out if file exists, but cannot be read
+                print("ERROR: Storage file exists but cannot be read")
+                sys.exit(1)
+        try:
+            data = json.loads(filedata)
+        except ValueError:
+            if len(filedata) > 0:
+                # Storage file is corrupted
+                print("ERROR: Storage JSON is corrupted")
+                sys.exit(1)
+        return data
+
+    def save(self):
+        """Saves the storage content to disk"""
+        serialized = json.dumps(self._data)
+        try:
+            with os.fdopen(
+                os.open(self.storagepath, os.O_WRONLY | os.O_CREAT, 0o600), "w"
+            ) as fh:
+                fh.truncate()
+                fh.write(serialized)
+        except IOError as e:
+            print("ERROR: Could not write storage file.")
+            sys.exit(1)
+
+    def put(self, key, value):
+        """Puts the configuration value to storage and sanitize it"""
+        # If wildcard domain, remove the wildcard part as this will use the
+        # same validation record name as the base domain
+        if key.startswith("*."):
+            key = key[2:]
+        self._data[key] = value
+
+    def fetch(self, key):
+        """Gets configuration value from storage"""
+        try:
+            return self._data[key]
+        except KeyError:
+            return None
+
+
+if __name__ == "__main__":
+    # Init
+    client = AcmeDnsClient(ACMEDNS_URL)
+    storage = Storage(STORAGE_PATH)
+
+    # Check if an account already exists in storage
+    account = storage.fetch(DOMAIN)
+    if FORCE_REGISTER or not account:
+        # Create and save the new account
+        account = client.register_account(ALLOW_FROM)
+        storage.put(DOMAIN, account)
+        storage.save()
+
+        # Display the notification for the user to update the main zone
+        msg = "Please add the following CNAME record to your main DNS zone:\n{}"
+        cname = "{} CNAME {}.".format(VALIDATION_DOMAIN, account["fulldomain"])
+        print(msg.format(cname))
+
+    # Update the TXT record in acme-dns instance
+    client.update_txt_record(account, VALIDATION_TOKEN)
diff --git a/templates/ingress/etc_crontab.j2 b/templates/ingress/etc_crontab.j2
index 3aa39e1..6879766 100644
--- a/templates/ingress/etc_crontab.j2
+++ b/templates/ingress/etc_crontab.j2
@@ -7,9 +7,7 @@ PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin
 #minute hour    mday    month   wday    who     command
 
 # Update LetsEncrypt certificates every day after 2:00 AM
-{% for host in tls_hosts %}
-{{ loop.index0 }}       2       *       *       *       root    certbot certonly --nginx -n -m jan@jantuomi.fi --agree-tos -d {{ host }}
-{% endfor %}
+0       2       *       *       *       root    certbot certonly -n -m {{ contact_email }} --agree-tos --manual --manual-auth-hook /usr/local/bin/acme-dns-auth.py --preferred-challenges dns --debug-challenges {% for domain in cert_domains %}-d '{{ domain }}' {% endfor %} || echo "ERROR: Failed to renew certs" >&2
 
 # Update dynamic DNS (Hetzner)
 {% for elem in hetzner_zone_record_ids %}
diff --git a/templates/ingress/usr_local_etc_nginx_nginx.conf.j2 b/templates/ingress/usr_local_etc_nginx_nginx.conf.j2
index 037a724..c568a7f 100644
--- a/templates/ingress/usr_local_etc_nginx_nginx.conf.j2
+++ b/templates/ingress/usr_local_etc_nginx_nginx.conf.j2
@@ -40,8 +40,8 @@ http {
         # See https://ssl-config.mozilla.org/#server=nginx&version=1.28.0&config=intermediate&openssl=3.4.0&guideline=5.7
         add_header Strict-Transport-Security "max-age=63072000" always;
 
-        ssl_certificate /usr/local/etc/letsencrypt/live/{{ route.host }}/fullchain.pem;
-        ssl_certificate_key /usr/local/etc/letsencrypt/live/{{ route.host }}/privkey.pem;
+        ssl_certificate /usr/local/etc/letsencrypt/live/{{ cert_name }}/fullchain.pem;
+        ssl_certificate_key /usr/local/etc/letsencrypt/live/{{ cert_name }}/privkey.pem;
         include /usr/local/etc/letsencrypt/options-ssl-nginx.conf;
         ssl_dhparam /usr/local/etc/letsencrypt/ssl-dhparams.pem;
 
@@ -78,8 +78,8 @@ http {
         # See https://ssl-config.mozilla.org/#server=nginx&version=1.28.0&config=intermediate&openssl=3.4.0&guideline=5.7
         add_header Strict-Transport-Security "max-age=63072000" always;
 
-        ssl_certificate /usr/local/etc/letsencrypt/live/{{ route.host }}/fullchain.pem;
-        ssl_certificate_key /usr/local/etc/letsencrypt/live/{{ route.host }}/privkey.pem;
+        ssl_certificate /usr/local/etc/letsencrypt/live/{{ cert_name }}/fullchain.pem;
+        ssl_certificate_key /usr/local/etc/letsencrypt/live/{{ cert_name }}/privkey.pem;
         include /usr/local/etc/letsencrypt/options-ssl-nginx.conf;
         ssl_dhparam /usr/local/etc/letsencrypt/ssl-dhparams.pem;
 
@@ -96,8 +96,8 @@ http {
         # See https://ssl-config.mozilla.org/#server=nginx&version=1.28.0&config=intermediate&openssl=3.4.0&guideline=5.7
         add_header Strict-Transport-Security "max-age=63072000" always;
 
-        ssl_certificate /usr/local/etc/letsencrypt/live/{{ route.host }}/fullchain.pem;
-        ssl_certificate_key /usr/local/etc/letsencrypt/live/{{ route.host }}/privkey.pem;
+        ssl_certificate /usr/local/etc/letsencrypt/live/{{ cert_name }}/fullchain.pem;
+        ssl_certificate_key /usr/local/etc/letsencrypt/live/{{ cert_name }}/privkey.pem;
         include /usr/local/etc/letsencrypt/options-ssl-nginx.conf;
         ssl_dhparam /usr/local/etc/letsencrypt/ssl-dhparams.pem;