mailinabox/management/web_update.py

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# Creates an nginx configuration file so we serve HTTP/HTTPS on all
# domains for which a mail account has been set up.
########################################################################
import os, os.path, re, rtyaml
from mailconfig import get_mail_domains
from dns_update import get_custom_dns_config
from utils import shell, safe_domain_name, sort_domains
def get_web_domains(env):
# What domains should we serve websites for?
domains = set()
# At the least it's the PRIMARY_HOSTNAME so we can serve webmail
# as well as Z-Push for Exchange ActiveSync.
domains.add(env['PRIMARY_HOSTNAME'])
# Also serve web for all mail domains so that we might at least
# provide Webfinger and ActiveSync auto-discover of email settings
# (though the latter isn't really working). These will require that
# an SSL cert be installed.
domains |= get_mail_domains(env)
# ...Unless the domain has an A/AAAA record that maps it to a different
# IP address than this box. Remove those domains from our list.
dns = get_custom_dns_config(env)
for domain, value in dns.items():
if domain not in domains: continue
if (isinstance(value, str) and (value != "local")) \
or (isinstance(value, dict) and ("A" in value) and (value["A"] != "local")) \
or (isinstance(value, dict) and ("AAAA" in value) and (value["AAAA"] != "local")):
domains.remove(domain)
# Sort the list. Put PRIMARY_HOSTNAME first so it becomes the
# default server (nginx's default_server).
domains = sort_domains(domains, env)
return domains
def do_web_update(env):
# Build an nginx configuration file.
nginx_conf = open(os.path.join(os.path.dirname(__file__), "../conf/nginx-top.conf")).read()
# Add configuration for each web domain.
template1 = open(os.path.join(os.path.dirname(__file__), "../conf/nginx.conf")).read()
template2 = open(os.path.join(os.path.dirname(__file__), "../conf/nginx-primaryonly.conf")).read()
for domain in get_web_domains(env):
nginx_conf += make_domain_config(domain, template1, template2, env)
# Did the file change? If not, don't bother writing & restarting nginx.
nginx_conf_fn = "/etc/nginx/conf.d/local.conf"
if os.path.exists(nginx_conf_fn):
with open(nginx_conf_fn) as f:
if f.read() == nginx_conf:
return ""
# Save the file.
with open(nginx_conf_fn, "w") as f:
f.write(nginx_conf)
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# Kick nginx. Since this might be called from the web admin
# don't do a 'restart'. That would kill the connection before
# the API returns its response. A 'reload' should be good
# enough and doesn't break any open connections.
shell('check_call', ["/usr/sbin/service", "nginx", "reload"])
return "web updated\n"
def make_domain_config(domain, template, template_for_primaryhost, env):
# How will we configure this domain.
# Where will its root directory be for static files?
root = get_web_root(domain, env)
# What private key and SSL certificate will we use for this domain?
ssl_key, ssl_certificate, csr_path = get_domain_ssl_files(domain, env)
# For hostnames created after the initial setup, ensure we have an SSL certificate
# available. Make a self-signed one now if one doesn't exist.
ensure_ssl_certificate_exists(domain, ssl_key, ssl_certificate, csr_path, env)
# Put pieces together.
nginx_conf_parts = re.split("\s*# ADDITIONAL DIRECTIVES HERE\s*", template)
nginx_conf = nginx_conf_parts[0] + "\n"
if domain == env['PRIMARY_HOSTNAME']:
nginx_conf += template_for_primaryhost + "\n"
# Replace substitution strings in the template & return.
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)
# Add in any user customizations in YAML format.
nginx_conf_custom_fn = os.path.join(env["STORAGE_ROOT"], "www/custom.yaml")
if os.path.exists(nginx_conf_custom_fn):
yaml = rtyaml.load(open(nginx_conf_custom_fn))
if domain in yaml:
yaml = yaml[domain]
for path, url in yaml.get("proxies", {}).items():
nginx_conf += "\tlocation %s {\n\t\tproxy_pass %s;\n\t}\n" % (path, url)
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# Add in any user customizations in the includes/ folder.
nginx_conf_custom_include = os.path.join(env["STORAGE_ROOT"], "www", safe_domain_name(domain) + ".conf")
if os.path.exists(nginx_conf_custom_include):
nginx_conf += "\tinclude %s;\n" % (nginx_conf_custom_include)
# Ending.
nginx_conf += nginx_conf_parts[1]
return nginx_conf
def get_web_root(domain, env):
# Try STORAGE_ROOT/web/domain_name if it exists, but fall back to STORAGE_ROOT/web/default.
for test_domain in (domain, 'default'):
root = os.path.join(env["STORAGE_ROOT"], "www", safe_domain_name(test_domain))
if os.path.exists(root): break
return root
def get_domain_ssl_files(domain, env):
# What SSL private key will we use? Allow the user to override this, but
# in many cases using the same private key for all domains would be fine.
# Don't allow the user to override the key for PRIMARY_HOSTNAME because
# that's what's in the main file.
ssl_key = os.path.join(env["STORAGE_ROOT"], 'ssl/ssl_private_key.pem')
ssl_key_is_alt = False
alt_key = os.path.join(env["STORAGE_ROOT"], 'ssl/%s/private_key.pem' % safe_domain_name(domain))
if domain != env['PRIMARY_HOSTNAME'] and os.path.exists(alt_key):
ssl_key = alt_key
ssl_key_is_alt = True
# What SSL certificate will we use?
ssl_certificate_primary = os.path.join(env["STORAGE_ROOT"], 'ssl/ssl_certificate.pem')
if domain == env['PRIMARY_HOSTNAME']:
# For PRIMARY_HOSTNAME, use the one we generated at set-up time.
ssl_certificate = ssl_certificate_primary
else:
# For other domains, we'll probably use a certificate in a different path.
ssl_certificate = os.path.join(env["STORAGE_ROOT"], 'ssl/%s/ssl_certificate.pem' % safe_domain_name(domain))
# But we can be smart and reuse the main SSL certificate if is has
# a Subject Alternative Name matching this domain. Don't do this if
# the user has uploaded a different private key for this domain.
if not ssl_key_is_alt:
from status_checks import check_certificate
if check_certificate(domain, ssl_certificate_primary, None) == "OK":
ssl_certificate = ssl_certificate_primary
# Where would the CSR go? As with the SSL cert itself, the CSR must be
# different for each domain name.
if domain == env['PRIMARY_HOSTNAME']:
csr_path = os.path.join(env["STORAGE_ROOT"], 'ssl/ssl_cert_sign_req.csr')
else:
csr_path = os.path.join(env["STORAGE_ROOT"], 'ssl/%s/certificate_signing_request.csr' % safe_domain_name(domain))
return ssl_key, ssl_certificate, csr_path
def ensure_ssl_certificate_exists(domain, ssl_key, ssl_certificate, csr_path, env):
# For domains besides PRIMARY_HOSTNAME, generate a self-signed certificate if
# a certificate doesn't already exist. See setup/mail.sh for documentation.
if domain == env['PRIMARY_HOSTNAME']:
return
# Sanity check. Shouldn't happen. A non-primary domain might use this
# certificate (see above), but then the certificate should exist anyway.
if ssl_certificate == os.path.join(env["STORAGE_ROOT"], 'ssl/ssl_certificate.pem'):
return
if os.path.exists(ssl_certificate):
return
os.makedirs(os.path.dirname(ssl_certificate), exist_ok=True)
# Generate a new self-signed certificate using the same private key that we already have.
# Start with a CSR.
shell("check_call", [
"openssl", "req", "-new",
"-key", ssl_key,
"-out", csr_path,
"-sha256",
"-subj", "/C=%s/ST=/L=/O=/CN=%s" % (env["CSR_COUNTRY"], domain)])
# And then make the certificate.
shell("check_call", [
"openssl", "x509", "-req",
"-days", "365",
"-in", csr_path,
"-signkey", ssl_key,
"-out", ssl_certificate])