From 5c653a3cc2c3911ebbbe4b75b2aefdea236932db Mon Sep 17 00:00:00 2001
From: Noah Petherbridge <root@kirsle.net>
Date: Thu, 31 Dec 2015 03:25:34 +0000
Subject: [PATCH] Add renew-certs script

---
 home/bin/renew-certs.py | 99 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100755 home/bin/renew-certs.py

diff --git a/home/bin/renew-certs.py b/home/bin/renew-certs.py
new file mode 100755
index 0000000..ad9e0b7
--- /dev/null
+++ b/home/bin/renew-certs.py
@@ -0,0 +1,99 @@
+#!/usr/bin/env python3
+
+# Cron script to renew LetsEncrypt certificates.
+#
+# --Kirsle
+# https://sh.kirsle.net/
+
+import os
+import subprocess
+import time
+
+################################################################################
+# Configuration Section Begins                                                 #
+################################################################################
+
+# Let's Encrypt directories
+LE_APPDIR = "/opt/letsencrypt"       # Where `letsencrypt-auto` lives
+LE_CERTS  = "/etc/letsencrypt/live"  # Where live certificates go
+
+# Common arguments to letsencrypt-auto
+COMMON = ["./letsencrypt-auto", "certonly", "--renew",
+          "--webroot", "-w", "/var/www/html"]
+
+# Domains and their subdomains; one array element per certificate, with each
+# array element being a list of domains to include in the same cert.
+CERTS = [
+    [ "www.kirsle.net", "kirsle.net", "www.kirsle.com", "kirsle.com",
+      "www.kirsle.org", "kirsle.org", "sh.kirsle.net", "rpm.kirsle.net",
+      "minecraft.kirsle.net", "mc.kirsle.net", "rophako.kirsle.net" ],
+    [ "noah.is", "www.noah.is", "petherbridge.org", "www.petherbridge.org",
+      "noah.petherbridge.org", "noahpetherbridge.com",
+      "www.noahpetherbridge.com" ],
+    [ "rivescript.com", "www.rivescript.com", "static.rivescript.com" ],
+    [ "siikir.com", "www.siikir.com" ],
+    [ "collegegent.com", "www.collegegent.com" ],
+]
+
+# Minimum lifetime for certificate before renewing it?
+LIFETIME = 60*60*24*30  # Once a month.
+
+# Command to run after finishing if certs were renewed.
+RESTART_COMMAND = ["service", "nginx", "reload"]
+
+################################################################################
+# End Configuration Section                                                    #
+################################################################################
+
+def main():
+    os.chdir(LE_APPDIR)
+
+    # If any certs were renewed, we'll schedule the restart command at the end.
+    any_renewed = False
+
+    # See which certificates are ready to be renewed.
+    print("Checking SSL certificates for renewal")
+    for cert in CERTS:
+        ready = False  # Ready to renew this one
+        primary = cert[0]
+
+        # Find its existing live certificate file.
+        home = os.path.join(LE_CERTS, primary)
+        chain = os.path.join(home, "cert.pem")
+
+        # When was it last modified?
+        if not os.path.isfile(chain):
+            print("NOTE: No existing cert file found for {} ({})".format(
+                primary,
+                chain,
+            ))
+            ready = True
+        else:
+            mtime = os.stat(chain).st_mtime
+            if time.time() - mtime > LIFETIME:
+                print("Cert for {} is old; scheduling it for renewal!"\
+                    .format(primary))
+                ready = True
+
+        # Proceed?
+        if ready:
+            print("Renewing certificate for {}...".format(primary))
+            command = []
+            command.extend(COMMON)
+
+            # Add all the domains.
+            for domain in cert:
+                command.extend(["-d", domain])
+
+            print("Exec: {}".format(" ".join(command)))
+            subprocess.call(command)
+            any_renewed = True
+
+    # If any certs were changed, restart the web server.
+    if any_renewed:
+        print("Restarting the web server: {}".format(" ".join(RESTART_COMMAND)))
+        subprocess.call(RESTART_COMMAND)
+
+if __name__ == "__main__":
+    main()
+