provision and install free SSL certificates from Let's Encrypt

conf/nginx.conf

 ## $HOSTNAME
 
-# Redirect all HTTP to HTTPS.
+# Redirect all HTTP to HTTPS *except* the ACME challenges (Let's Encrypt SSL certificate
+# domain validation challenges) path, which must be served over HTTP per the ACME spec
+# (due to some Apache vulnerability).
 server {
 	listen 80;
 	listen [::]:80;
@@ -12,10 +14,19 @@ server {
 	# error pages and in the "Server" HTTP-Header.
 	server_tokens off;
 
+	location / {
 		# Redirect using the 'return' directive and the built-in
 		# variable '$request_uri' to avoid any capturing, matching
 		# or evaluation of regular expressions.
 		return 301 https://$HOSTNAME$request_uri;
+	}
+
+	location /.well-known/acme-challenge/ {
+		# This path must be served over HTTP for ACME domain validation.
+		# We map this to a special path where our SSL cert provisioning
+		# tool knows to store challenge response files.
+		alias $STORAGE_ROOT/ssl/lets_encrypt/acme_challenges/;
+	}
 }
 
 # The secure HTTPS server.

management/daily_tasks.sh

@@ -4,5 +4,8 @@
 # Take a backup.
 management/backup.py | management/email_administrator.py "Backup Status"
 
+# Provision any new certificates for new domains or domains with expiring certificates.
+management/ssl_certificates.py --headless | management/email_administrator.py "Error Provisioning TLS Certificate"
+
 # Run status checks and email the administrator if anything changed.
 management/status_checks.py --show-changes | management/email_administrator.py "Status Checks Change Notice"

management/ssl_certificates.py

+#!/usr/bin/python3
 # Utilities for installing and selecting SSL certificates.
 
 import os, os.path, re, shutil
 
-from utils import shell, safe_domain_name
+from utils import shell, safe_domain_name, sort_domains
+
+# SELECTING SSL CERTIFICATES FOR USE IN WEB
 
 def get_ssl_certificates(env):
 	# Scan all of the installed SSL certificates and map every domain
@@ -17,6 +20,8 @@ def get_ssl_certificates(env):
 
 	# List all of the files in the SSL directory and one level deep.
 	def get_file_list():
+		if not os.path.exists(ssl_root):
+			return
 		for fn in os.listdir(ssl_root):
 			fn = os.path.join(ssl_root, fn)
 			if os.path.isfile(fn):
@@ -82,10 +87,27 @@ def get_ssl_certificates(env):
 			# prefer one that is not self-signed
 			cert.issuer != cert.subject,
 
+			###########################################################
+			# The above lines ensure that valid certificates are chosen
+			# over invalid certificates. The lines below choose between
+			# multiple valid certificates available for this domain.
+			###########################################################
+
 			# prefer one with the expiration furthest into the future so
 			# that we can easily rotate to new certs as we get them
 			cert.not_valid_after,
 
+			###########################################################
+			# We always choose the certificate that is good for the
+			# longest period of time. This is important for how we
+			# provision certificates for Let's Encrypt. To ensure that
+			# we don't re-provision every night, we have to ensure that
+			# if we choose to provison a certificate that it will
+			# *actually* be used so the provisioning logic knows it
+			# doesn't still need to provision a certificate for the
+			# domain.
+			###########################################################
+
 			# in case a certificate is installed in multiple paths,
 			# prefer the... lexicographically last one?
 			cert._filename,
@@ -96,46 +118,348 @@ def get_ssl_certificates(env):
 			"private-key": cert._private_key._filename,
 			"certificate": cert._filename,
 			"primary-domain": cert._primary_domain,
+			"certificate_object": cert,
 			}
 
 	return ret
 
-def get_domain_ssl_files(domain, ssl_certificates, env, allow_missing_cert=False):
-	# Get the default paths.
+def get_domain_ssl_files(domain, ssl_certificates, env, allow_missing_cert=False, raw=False):
+	# Get the system certificate info.
 	ssl_private_key = os.path.join(os.path.join(env["STORAGE_ROOT"], 'ssl', 'ssl_private_key.pem'))
 	ssl_certificate = os.path.join(os.path.join(env["STORAGE_ROOT"], 'ssl', 'ssl_certificate.pem'))
+	system_certificate = {
+		"private-key": ssl_private_key,
+		"certificate": ssl_certificate,
+		"primary-domain": env['PRIMARY_HOSTNAME'],
+		"certificate_object": load_pem(load_cert_chain(ssl_certificate)[0]),
+	}
 
 	if domain == env['PRIMARY_HOSTNAME']:
 		# The primary domain must use the server certificate because
 		# it is hard-coded in some service configuration files.
-		return ssl_private_key, ssl_certificate, None
+		return system_certificate
 
 	wildcard_domain = re.sub("^[^\.]+", "*", domain)
-
 	if domain in ssl_certificates:
-		cert_info = ssl_certificates[domain]
-		cert_type = "multi-domain"
+		return ssl_certificates[domain]
 	elif wildcard_domain in ssl_certificates:
-		cert_info = ssl_certificates[wildcard_domain]
-		cert_type = "wildcard"
+		return ssl_certificates[wildcard_domain]
 	elif not allow_missing_cert:
-		# No certificate is available for this domain! Return default files.
-		ssl_via = "Using certificate for %s." % env['PRIMARY_HOSTNAME']
-		return ssl_private_key, ssl_certificate, ssl_via
+		# No valid certificate is available for this domain! Return default files.
+		return system_certificate
 	else:
-		# No certificate is available - and warn appropriately.
+		# No valid certificate is available for this domain.
 		return None
 
-	# 'via' is a hint to the user about which certificate is in use for the domain
-	if cert_info['certificate'] == os.path.join(env["STORAGE_ROOT"], 'ssl', 'ssl_certificate.pem'):
-		# Using the server certificate.
-		via = "Using same %s certificate as for %s." % (cert_type, env['PRIMARY_HOSTNAME'])
-	elif cert_info['primary-domain'] != domain and cert_info['primary-domain'] in ssl_certificates and cert_info == ssl_certificates[cert_info['primary-domain']]:
-		via = "Using same %s certificate as for %s." % (cert_type, cert_info['primary-domain'])
+
+# PROVISIONING CERTIFICATES FROM LETSENCRYPT
+
+def get_certificates_to_provision(env):
+	# Get a list of domain names that we should now provision certificates
+	# for. Provision if a domain name has no valid certificate or if any
+	# certificate is expiring in 14 days. If provisioning anything, also
+	# provision certificates expiring within 30 days. The period between
+	# 14 and 30 days allows us to consolidate domains into multi-domain
+	# certificates for domains expiring around the same time.
+
+	from web_update import get_web_domains
+
+	import datetime
+	now = datetime.datetime.utcnow()
+
+	# Get domains with missing & expiring certificates.
+	certs = get_ssl_certificates(env)
+	domains = set()
+	domains_if_any = set()
+	for domain in get_web_domains(env):
+		try:
+			cert = get_domain_ssl_files(domain, certs, env, allow_missing_cert=True)
+		except FileNotFoundError:
+			# system certificate is not present
+			continue
+		if cert is None:
+			# No valid certificate available.
+			domains.add(domain)
 		else:
-		via = None # don't show a hint - show expiration info instead
+			cert = cert["certificate_object"]
+			if cert.issuer == cert.subject:
+				# This is self-signed. Get a real one.
+				domains.add(domain)
+			
+			# Valid certificate today, but is it expiring soon?
+			elif cert.not_valid_after-now < datetime.timedelta(days=14):
+				domains.add(domain)
+			elif cert.not_valid_after-now < datetime.timedelta(days=30):
+				domains_if_any.add(domain)
+
+	# Filter out domains that don't have correct DNS, because then the CA
+	# won't be able to do DNS validation.
+	def is_domain_dns_correct(domain):
+		# Must make qname absolute to prevent a fall-back lookup with a
+		# search domain appended.
+		import dns.resolver
+		try:
+			response = dns.resolver.query(domain + ".", "A")
+		except:
+			return False
+		return len(response) == 1 and str(response[0]) == env["PUBLIC_IP"]
+	domains = set(d for d in domains if is_domain_dns_correct(d))
+	domains_if_any = set(d for d in domains_if_any if is_domain_dns_correct(d))
+
+	# If there are any domains we definitely will provision for, add in
+	# additional domains to do at this time.
+	if len(domains) > 0:
+		domains |= domains_if_any
+
+	# Sort, just to keep related domain names together in the next step.
+	domains = sort_domains(domains, env)
+
+	# Break into groups of up to 100 certificates at a time, which is Let's Encrypt's
+	# limit for a single certificate.
+	cert_domains = []
+	while len(domains) > 0:
+		cert_domains.append( domains[0:100] )
+		domains = domains[100:]
+
+	# Return a list of lists of domain names.
+	return cert_domains
+
+def provision_certificates(env, agree_to_tos_url=None, logger=None):
+	import requests.exceptions
+	import acme.messages
+
+	from free_tls_certificates import client
+
+	# What domains to provision certificates for? This is a list of
+	# lists of domains.
+	certs = get_certificates_to_provision(env)
+	if len(certs) == 0:
+		return {
+			"requests": [],
+		}
+
+	# Prepare to provision.
+
+	# Where should we put our Let's Encrypt account info and state cache.
+	account_path = os.path.join(env['STORAGE_ROOT'], 'ssl/lets_encrypt')
+	if not os.path.exists(account_path):
+		os.mkdir(account_path)
+
+	# Where should we put ACME challenge files. This is mapped to /.well-known/acme_challenge
+	# by the nginx configuration.
+	challenges_path = os.path.join(account_path, 'acme_challenges')
+	if not os.path.exists(challenges_path):
+		os.mkdir(challenges_path)
+
+	# Read in the private key that we use for all TLS certificates. We'll need that
+	# to generate a CSR (done by free_tls_certificates).
+	with open(os.path.join(env['STORAGE_ROOT'], 'ssl/ssl_private_key.pem'), 'rb') as f:
+		private_key = f.read()
 
-	return cert_info['private-key'], cert_info['certificate'], via
+	# Provision certificates.
+
+	ret = []
+	for domain_list in certs:
+		# For return.
+		ret_item = {
+			"domains": domain_list,
+			"log": [],
+		}
+		ret.append(ret_item)
+
+		# Logging for free_tls_certificates.
+		def my_logger(message):
+			if logger: logger(message)
+			ret_item["log"].append(message)
+
+		# Attempt to provision a certificate.
+		try:
+			try:
+				cert = client.issue_certificate(
+					domain_list,
+					account_path,
+					agree_to_tos_url=agree_to_tos_url,
+					private_key=private_key,
+					logger=my_logger)
+
+			except client.NeedToTakeAction as e:
+				# Write out the ACME challenge files.
+				
+				for action in e.actions:
+					if isinstance(action, client.NeedToInstallFile):
+						fn = os.path.join(challenges_path, action.file_name)
+						with open(fn, 'w') as f:
+							f.write(action.contents)
+					else:
+						raise ValueError(str(action))
+
+				# Try to provision now that the challenge files are installed.
+
+				cert = client.issue_certificate(
+					domain_list,
+					account_path,
+					private_key=private_key,
+					logger=my_logger)
+
+		except client.NeedToAgreeToTOS as e:
+			# The user must agree to the Let's Encrypt terms of service agreement
+			# before any further action can be taken.
+			ret_item.update({
+				"result": "agree-to-tos",
+				"url": e.url,
+			})
+
+		except client.WaitABit as e:
+			# We need to hold on for a bit before querying again to see if we can
+			# acquire a provisioned certificate.
+			import time, datetime
+			ret_item.update({
+				"result": "wait",
+				"until": e.until_when, #.isoformat(),
+				"seconds": (e.until_when - datetime.datetime.now()).total_seconds()
+			})
+
+		except client.AccountDataIsCorrupt as e:
+			# This is an extremely rare condition.
+			ret_item.update({
+				"result": "error",
+				"message": "Something unexpected went wrong. It looks like your local Let's Encrypt account data is corrupted. There was a problem with the file " + e.account_file_path + ".",
+			})
+
+		except (client.InvalidDomainName, client.NeedToTakeAction, acme.messages.Error, requests.exceptions.RequestException) as e:
+			ret_item.update({
+				"result": "error",
+				"message": "Something unexpected went wrong: " + str(e),
+			})
+
+		else:
+			# A certificate was issued.
+
+			install_status = install_cert(domain_list[0], cert['cert'].decode("ascii"), b"\n".join(cert['chain']).decode("ascii"), env, raw=True)
+
+			# str indicates the certificate was not installed.
+			if isinstance(install_status, str):
+				ret_item.update({
+					"result": "error",
+					"message": "Something unexpected was wrong with the provisioned certificate: " + install_status,
+				})
+			else:
+				# A list indicates success and what happened next.
+				ret_item["log"].extend(install_status)
+				ret_item.update({
+					"result": "installed",
+				})
+
+	# Return what happened with each certificate request.
+	return {
+		"requests": ret
+	}
+
+def provision_certificates_cmdline():
+	import sys
+	from utils import load_environment, exclusive_process
+
+	exclusive_process("update_tls_certificates")
+	env = load_environment()
+
+	agree_to_tos_url = None
+	while True:
+		# Run the provisioning script. This installs certificates. If there are
+		# a very large number of domains on this box, it issues separate
+		# certificates for groups of domains. We have to check the result for
+		# each group.
+		def my_logger(message):
+			if "-v" in sys.argv:
+				print(">", message)
+		status = provision_certificates(env, agree_to_tos_url=agree_to_tos_url, logger=my_logger)
+		agree_to_tos_url = None # reset to prevent infinite looping
+
+		if not status["requests"]:
+			# No domains need certificates.
+			if "--headless" not in sys.argv or "-v" in sys.argv:
+				print("No domains hosted on this box need a certificate at this time.")
+			sys.exit(0)
+
+		# What happened?
+		wait_until = None
+		wait_domains = []
+		for request in status["requests"]:
+			if request["result"] == "agree-to-tos":
+				# We may have asked already in a previous iteration.
+				if agree_to_tos_url is not None:
+					continue
+
+				# Can't ask the user a question in this mode.
+				if "--headless" in sys.argv:
+					print("Can't issue TLS certficate until user has agreed to Let's Encrypt TOS.")
+					sys.exit(1)
+
+				print("""
+I'm going to provision a TLS certificate (formerly called a SSL certificate)
+for you from Let's Encrypt (letsencrypt.org).
+
+TLS certificates are cryptographic keys that ensure communication between
+you and this box are secure when getting and sending mail and visiting
+websites hosted on this box. Let's Encrypt is a free provider of TLS
+certificates.
+
+Please open this document in your web browser:
+
+%s
+
+It is Let's Encrypt's terms of service agreement. If you agree, I can
+provision that TLS certificate. If you don't agree, you will have an
+opportunity to install your own TLS certificate from the Mail-in-a-Box
+control panel.
+
+Do you agree to the agreement? Type Y or N and press <ENTER>: """
+				 % request["url"], end='', flush=True)
+			
+				if sys.stdin.readline().strip().upper() != "Y":
+					print("\nYou didn't agree. Quitting.")
+					sys.exit(1)
+
+				# Okay, indicate agreement on next iteration.
+				agree_to_tos_url = request["url"]
+
+			if request["result"] == "wait":
+				# Must wait. We'll record until when. The wait occurs below.
+				if wait_until is None:
+					wait_until = request["until"]
+				else:
+					wait_until = max(wait_until, request["until"])
+				wait_domains += request["domains"]
+
+			if request["result"] == "error":
+				print(", ".join(request["domains"]) + ":")
+				print(request["message"])
+
+			if request["result"] == "installed":
+				print("A TLS certificate was successfully installed for " + ", ".join(request["domains"]) + ".")
+
+		if wait_until:
+			# Wait, then loop.
+			import time, datetime
+			print()
+			print("A TLS certificate was requested for: " + ", ".join(wait_domains) + ".")
+			first = True
+			while wait_until > datetime.datetime.now():
+				if "--headless" not in sys.argv or first:
+					print ("We have to wait", int(round((wait_until - datetime.datetime.now()).total_seconds())), "seconds for the certificate to be issued...")
+				time.sleep(10)
+				first = False
+
+			continue # Loop!
+
+		if agree_to_tos_url:
+			# The user agrees to the TOS. Loop to try again by agreeing.
+			continue # Loop!
+
+		# Unless we were instructed to wait, or we just agreed to the TOS,
+		# we're done for now.
+		break
+
+# INSTALLING A NEW CERTIFICATE FROM THE CONTROL PANEL
 
 def create_csr(domain, ssl_key, country_code, env):
 	return shell("check_output", [
@@ -144,7 +468,7 @@ def create_csr(domain, ssl_key, country_code, env):
                 "-sha256",
                 "-subj", "/C=%s/ST=/L=/O=/CN=%s" % (country_code, domain)])
 
-def install_cert(domain, ssl_cert, ssl_chain, env):
+def install_cert(domain, ssl_cert, ssl_chain, env, raw=False):
 	# Write the combined cert+chain to a temporary path and validate that it is OK.
 	# The certificate always goes above the chain.
 	import tempfile
@@ -203,8 +527,10 @@ def install_cert(domain, ssl_cert, ssl_chain, env):
 	# Update the web configuration so nginx picks up the new certificate file.
 	from web_update import do_web_update
 	ret.append( do_web_update(env) )
+	if raw: return ret
 	return "\n".join(ret)
 
+# VALIDATION OF CERTIFICATES
 
 def check_certificate(domain, ssl_certificate, ssl_private_key, warn_if_expiring_soon=True, rounded_time=False, just_check_domain=False):
 	# Check that the ssl_certificate & ssl_private_key files are good
@@ -305,16 +631,16 @@ def check_certificate(domain, ssl_certificate, ssl_private_key, warn_if_expiring
 		# But is it expiring soon?
 		cert_expiration_date = cert.not_valid_after
 		ndays = (cert_expiration_date-now).days
-		if not rounded_time or ndays < 7:
+		if not rounded_time or ndays <= 10:
+			# Yikes better renew soon!
 			expiry_info = "The certificate expires in %d days on %s." % (ndays, cert_expiration_date.strftime("%x"))
-		elif ndays <= 14:
-			expiry_info = "The certificate expires in less than two weeks, on %s." % cert_expiration_date.strftime("%x")
-		elif ndays <= 31:
-			expiry_info = "The certificate expires in less than a month, on %s." % cert_expiration_date.strftime("%x")
 		else:
+			# We'll renew it with Lets Encrypt.
 			expiry_info = "The certificate expires on %s." % cert_expiration_date.strftime("%x")
 
-		if ndays <= 31 and warn_if_expiring_soon:
+		if ndays <= 10 and warn_if_expiring_soon:
+			# Warn on day 10 to give 4 days for us to automatically renew the
+			# certificate, which occurs on day 14.
 			return ("The certificate is expiring soon: " + expiry_info, None)
 
 		# Return the special OK code.
@@ -381,3 +707,7 @@ def get_certificate_domains(cert):
 		pass
 
 	return names, cn
+
+if __name__  == "__main__":
+	# Provision certificates.
+	provision_certificates_cmdline()

management/status_checks.py

@@ -278,23 +278,24 @@ def run_domain_checks(rounded_time, env, output, pool):
 	# Get the list of domains that we don't serve web for because of a custom CNAME/A record.
 	domains_with_a_records = get_domains_with_a_records(env)
 
-	ssl_certificates = get_ssl_certificates(env)
-
 	# Serial version:
 	#for domain in sort_domains(domains_to_check, env):
 	#	run_domain_checks_on_domain(domain, rounded_time, env, dns_domains, dns_zonefiles, mail_domains, web_domains)
 
 	# Parallelize the checks across a worker pool.
-	args = ((domain, rounded_time, env, dns_domains, dns_zonefiles, mail_domains, web_domains, domains_with_a_records, ssl_certificates)
+	args = ((domain, rounded_time, env, dns_domains, dns_zonefiles, mail_domains, web_domains, domains_with_a_records)
 		for domain in domains_to_check)
 	ret = pool.starmap(run_domain_checks_on_domain, args, chunksize=1)
 	ret = dict(ret) # (domain, output) => { domain: output }
 	for domain in sort_domains(ret, env):
 		ret[domain].playback(output)
 
-def run_domain_checks_on_domain(domain, rounded_time, env, dns_domains, dns_zonefiles, mail_domains, web_domains, domains_with_a_records, ssl_certificates):
+def run_domain_checks_on_domain(domain, rounded_time, env, dns_domains, dns_zonefiles, mail_domains, web_domains, domains_with_a_records):
 	output = BufferedOutput()
 
+	# we'd move this up, but this returns non-pickleable values
+	ssl_certificates = get_ssl_certificates(env)
+
 	# The domain is IDNA-encoded in the database, but for display use Unicode.
 	try:
 		domain_display = idna.decode(domain.encode('ascii'))
@@ -656,45 +657,28 @@ def check_ssl_cert(domain, rounded_time, ssl_certificates, env, output):
 	if query_dns(domain, "A", None) not in (env['PUBLIC_IP'], None): return
 
 	# Where is the SSL stored?
-	x = get_domain_ssl_files(domain, ssl_certificates, env, allow_missing_cert=True)
-
-	if x is None:
+	tls_cert = get_domain_ssl_files(domain, ssl_certificates, env, allow_missing_cert=True)
+	if tls_cert is None:
 		output.print_warning("""No SSL certificate is installed for this domain. Visitors to a website on
 			this domain will get a security warning. If you are not serving a website on this domain, you do
 			not need to take any action. Use the SSL Certificates page in the control panel to install a
 			SSL certificate.""")
 		return
 
-	ssl_key, ssl_certificate, ssl_via = x
-
 	# Check that the certificate is good.
 
-	cert_status, cert_status_details = check_certificate(domain, ssl_certificate, ssl_key, rounded_time=rounded_time)
+	cert_status, cert_status_details = check_certificate(domain, tls_cert["certificate"], tls_cert["private-key"], rounded_time=rounded_time)
 
 	if cert_status == "OK":
 		# The certificate is ok. The details has expiry info.
-		output.print_ok("SSL certificate is signed & valid. %s %s" % (ssl_via if ssl_via else "", cert_status_details))
+		output.print_ok("SSL certificate is signed & valid. " + cert_status_details)
 
 	elif cert_status == "SELF-SIGNED":
 		# Offer instructions for purchasing a signed certificate.
-
-		fingerprint = shell('check_output', [
-			"openssl",
-			"x509",
-			"-in", ssl_certificate,
-			"-noout",
-			"-fingerprint"
-			])
-		fingerprint = re.sub(".*Fingerprint=", "", fingerprint).strip()
-
 		if domain == env['PRIMARY_HOSTNAME']:
 			output.print_error("""The SSL certificate for this domain is currently self-signed. You will get a security
 			warning when you check or send email and when visiting this domain in a web browser (for webmail or
-			static site hosting). Use the SSL Certificates page in the control panel to install a signed SSL certificate.
-			You may choose to leave the self-signed certificate in place and confirm the security exception, but check that
-			the certificate fingerprint matches the following:""")
-			output.print_line("")
-			output.print_line("   " + fingerprint, monospace=True)
+			static site hosting).""")
 		else:
 			output.print_error("""The SSL certificate for this domain is self-signed.""")
 
@@ -927,10 +911,10 @@ if __name__ == "__main__":
 		if query_dns(domain, "A") != env['PUBLIC_IP']:
 			sys.exit(1)
 		ssl_certificates = get_ssl_certificates(env)
-		ssl_key, ssl_certificate, ssl_via = get_domain_ssl_files(domain, ssl_certificates, env)
-		if not os.path.exists(ssl_certificate):
+		tls_cert = get_domain_ssl_files(domain, ssl_certificates, env)
+		if not os.path.exists(tls_cert["certificate"]):
 			sys.exit(1)
-		cert_status, cert_status_details = check_certificate(domain, ssl_certificate, ssl_key, warn_if_expiring_soon=False)
+		cert_status, cert_status_details = check_certificate(domain, tls_cert["certificate"], tls_cert["private-key"], warn_if_expiring_soon=False)
 		if cert_status != "OK":
 			sys.exit(1)
 		sys.exit(0)

management/web_update.py

@@ -119,7 +119,7 @@ def make_domain_config(domain, templates, ssl_certificates, env):
 	root = get_web_root(domain, env)
 
 	# What private key and SSL certificate will we use for this domain?
-	ssl_key, ssl_certificate, ssl_via = get_domain_ssl_files(domain, ssl_certificates, env)
+	tls_cert = get_domain_ssl_files(domain, ssl_certificates, env)
 
 	# ADDITIONAL DIRECTIVES.
 
@@ -136,7 +136,7 @@ def make_domain_config(domain, templates, ssl_certificates, env):
 		finally:
 			f.close()
 		return sha1.hexdigest()
-	nginx_conf_extra += "# ssl files sha1: %s / %s\n" % (hashfile(ssl_key), hashfile(ssl_certificate))
+	nginx_conf_extra += "# ssl files sha1: %s / %s\n" % (hashfile(tls_cert["private-key"]), hashfile(tls_cert["certificate"]))
 
 	# Add in any user customizations in YAML format.
 	hsts = "yes"
@@ -177,8 +177,8 @@ def make_domain_config(domain, templates, ssl_certificates, env):
 	nginx_conf = nginx_conf.replace("$STORAGE_ROOT", env['STORAGE_ROOT'])
 	nginx_conf = nginx_conf.replace("$HOSTNAME", domain)
 	nginx_conf = nginx_conf.replace("$ROOT", root)
-	nginx_conf = nginx_conf.replace("$SSL_KEY", ssl_key)
-	nginx_conf = nginx_conf.replace("$SSL_CERTIFICATE", ssl_certificate)
+	nginx_conf = nginx_conf.replace("$SSL_KEY", tls_cert["private-key"])
+	nginx_conf = nginx_conf.replace("$SSL_CERTIFICATE", tls_cert["certificate"])
 	nginx_conf = nginx_conf.replace("$REDIRECT_DOMAIN", re.sub(r"^www\.", "", domain)) # for default www redirects to parent domain
 
 	return nginx_conf
@@ -193,20 +193,15 @@ def get_web_root(domain, env, test_exists=True):
 def get_web_domains_info(env):
 	www_redirects = set(get_web_domains(env)) - set(get_web_domains(env, include_www_redirects=False))
 	has_root_proxy_or_redirect = set(get_web_domains_with_root_overrides(env))
+	ssl_certificates = get_ssl_certificates(env)
 
 	# for the SSL config panel, get cert status
 	def check_cert(domain):
-		ssl_certificates = get_ssl_certificates(env)
-		x = get_domain_ssl_files(domain, ssl_certificates, env, allow_missing_cert=True)
-		if x is None: return ("danger", "No Certificate Installed")
-		ssl_key, ssl_certificate, ssl_via = x
-		cert_status, cert_status_details = check_certificate(domain, ssl_certificate, ssl_key)
+		tls_cert = get_domain_ssl_files(domain, ssl_certificates, env, allow_missing_cert=True)
+		if tls_cert is None: return ("danger", "No Certificate Installed")
+		cert_status, cert_status_details = check_certificate(domain, tls_cert["certificate"], tls_cert["private-key"])
 		if cert_status == "OK":
-			if not ssl_via:
 			return ("success", "Signed & valid. " + cert_status_details)
-			else:
-				# This is an alternate domain but using the same cert as the primary domain.
-				return ("success", "Signed & valid. " + ssl_via)
 		elif cert_status == "SELF-SIGNED":
 			return ("warning", "Self-signed. Get a signed certificate to stop warnings.")
 		else:

setup/management.sh

@@ -11,8 +11,11 @@ if [ -f /usr/local/lib/python2.7/dist-packages/boto/__init__.py ]; then hide_out
 # build-essential libssl-dev libffi-dev python3-dev: Required to pip install cryptography.
 apt_install python3-flask links duplicity python-boto libyaml-dev python3-dnspython python3-dateutil \
 	build-essential libssl-dev libffi-dev python3-dev python-pip
-hide_output pip3 install --upgrade rtyaml "email_validator>=1.0.0" "idna>=2.0.0" "cryptography>=1.0.2" boto psutil
 
+# Install other Python packages. The first line is the packages that Josh maintains himself!
+hide_output pip3 install --upgrade \
+	rtyaml "email_validator>=1.0.0" free_tls_certificates \
+	"idna>=2.0.0" "cryptography>=1.0.2" boto psutil
 # email_validator is repeated in setup/questions.sh
 
 # Create a backup directory and a random key for encrypting backups.
@@ -44,5 +47,5 @@ cat > /etc/cron.d/mailinabox-nightly << EOF;
 0 3 * * *	root	(cd `pwd` && management/daily_tasks.sh)
 EOF
 
-# Start it.
+# Start the management server.
 restart_service mailinabox

setup/start.sh

@@ -116,6 +116,9 @@ done
 tools/dns_update
 tools/web_update
 
+# If DNS is already working, try to provision TLS certficates from Let's Encrypt.
+management/ssl_certificates.py
+
 # If there aren't any mail users yet, create one.
 source setup/firstuser.sh