dece359c90
* Use `cryptography` instead of parsing openssl's output. * When checking if we can reuse the primary domain certificate or a www-parent-domain certificate for a domain, avoid shelling out to openssl entirely.
337 lines
14 KiB
Python
337 lines
14 KiB
Python
# Creates an nginx configuration file so we serve HTTP/HTTPS on all
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# domains for which a mail account has been set up.
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########################################################################
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import os, os.path, shutil, re, tempfile, rtyaml
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from mailconfig import get_mail_domains
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from dns_update import get_custom_dns_config, do_dns_update, get_dns_zones
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from utils import shell, safe_domain_name, sort_domains
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def get_web_domains(env):
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# What domains should we serve websites for?
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domains = set()
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# At the least it's the PRIMARY_HOSTNAME so we can serve webmail
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# as well as Z-Push for Exchange ActiveSync.
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domains.add(env['PRIMARY_HOSTNAME'])
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# Also serve web for all mail domains so that we might at least
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# provide auto-discover of email settings, and also a static website
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# if the user wants to make one. These will require an SSL cert.
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# ...Unless the domain has an A/AAAA record that maps it to a different
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# IP address than this box. Remove those domains from our list.
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domains |= (get_mail_domains(env) - get_domains_with_a_records(env))
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# Sort the list so the nginx conf gets written in a stable order.
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domains = sort_domains(domains, env)
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return domains
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def get_domains_with_a_records(env):
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domains = set()
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dns = get_custom_dns_config(env)
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for domain, rtype, value in dns:
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if rtype == "CNAME" or (rtype in ("A", "AAAA") and value != "local"):
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domains.add(domain)
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return domains
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def get_web_domains_with_root_overrides(env):
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# Load custom settings so we can tell what domains have a redirect or proxy set up on '/',
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# which means static hosting is not happening.
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root_overrides = { }
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nginx_conf_custom_fn = os.path.join(env["STORAGE_ROOT"], "www/custom.yaml")
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if os.path.exists(nginx_conf_custom_fn):
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custom_settings = rtyaml.load(open(nginx_conf_custom_fn))
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for domain, settings in custom_settings.items():
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for type, value in [('redirect', settings.get('redirects', {}).get('/')),
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('proxy', settings.get('proxies', {}).get('/'))]:
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if value:
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root_overrides[domain] = (type, value)
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return root_overrides
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def get_default_www_redirects(env):
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# Returns a list of www subdomains that we want to provide default redirects
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# for, i.e. any www's that aren't domains the user has actually configured
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# to serve for real. Which would be unusual.
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web_domains = set(get_web_domains(env))
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www_domains = set('www.' + zone for zone, zonefile in get_dns_zones(env))
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return sort_domains(www_domains - web_domains - get_domains_with_a_records(env), env)
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def do_web_update(env):
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# Build an nginx configuration file.
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nginx_conf = open(os.path.join(os.path.dirname(__file__), "../conf/nginx-top.conf")).read()
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# Load the templates.
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template0 = open(os.path.join(os.path.dirname(__file__), "../conf/nginx.conf")).read()
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template1 = open(os.path.join(os.path.dirname(__file__), "../conf/nginx-alldomains.conf")).read()
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template2 = open(os.path.join(os.path.dirname(__file__), "../conf/nginx-primaryonly.conf")).read()
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template3 = "\trewrite ^(.*) https://$REDIRECT_DOMAIN$1 permanent;\n"
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# Add the PRIMARY_HOST configuration first so it becomes nginx's default server.
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nginx_conf += make_domain_config(env['PRIMARY_HOSTNAME'], [template0, template1, template2], env)
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# Add configuration all other web domains.
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has_root_proxy_or_redirect = get_web_domains_with_root_overrides(env)
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for domain in get_web_domains(env):
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if domain == env['PRIMARY_HOSTNAME']: continue # handled above
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if domain not in has_root_proxy_or_redirect:
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nginx_conf += make_domain_config(domain, [template0, template1], env)
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else:
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nginx_conf += make_domain_config(domain, [template0], env)
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# Add default www redirects.
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for domain in get_default_www_redirects(env):
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nginx_conf += make_domain_config(domain, [template0, template3], env)
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# Did the file change? If not, don't bother writing & restarting nginx.
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nginx_conf_fn = "/etc/nginx/conf.d/local.conf"
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if os.path.exists(nginx_conf_fn):
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with open(nginx_conf_fn) as f:
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if f.read() == nginx_conf:
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return ""
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# Save the file.
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with open(nginx_conf_fn, "w") as f:
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f.write(nginx_conf)
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# Kick nginx. Since this might be called from the web admin
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# don't do a 'restart'. That would kill the connection before
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# the API returns its response. A 'reload' should be good
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# enough and doesn't break any open connections.
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shell('check_call', ["/usr/sbin/service", "nginx", "reload"])
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return "web updated\n"
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def make_domain_config(domain, templates, env):
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# GET SOME VARIABLES
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# Where will its root directory be for static files?
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root = get_web_root(domain, env)
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# What private key and SSL certificate will we use for this domain?
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ssl_key, ssl_certificate, ssl_via = get_domain_ssl_files(domain, env)
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# For hostnames created after the initial setup, ensure we have an SSL certificate
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# available. Make a self-signed one now if one doesn't exist.
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ensure_ssl_certificate_exists(domain, ssl_key, ssl_certificate, env)
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# ADDITIONAL DIRECTIVES.
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nginx_conf_extra = ""
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# Because the certificate may change, we should recognize this so we
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# can trigger an nginx update.
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def hashfile(filepath):
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import hashlib
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sha1 = hashlib.sha1()
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f = open(filepath, 'rb')
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try:
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sha1.update(f.read())
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finally:
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f.close()
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return sha1.hexdigest()
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nginx_conf_extra += "# ssl files sha1: %s / %s\n" % (hashfile(ssl_key), hashfile(ssl_certificate))
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# Add in any user customizations in YAML format.
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nginx_conf_custom_fn = os.path.join(env["STORAGE_ROOT"], "www/custom.yaml")
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if os.path.exists(nginx_conf_custom_fn):
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yaml = rtyaml.load(open(nginx_conf_custom_fn))
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if domain in yaml:
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yaml = yaml[domain]
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for path, url in yaml.get("proxies", {}).items():
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nginx_conf_extra += "\tlocation %s {\n\t\tproxy_pass %s;\n\t}\n" % (path, url)
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for path, url in yaml.get("redirects", {}).items():
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nginx_conf_extra += "\trewrite %s %s permanent;\n" % (path, url)
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# Add in any user customizations in the includes/ folder.
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nginx_conf_custom_include = os.path.join(env["STORAGE_ROOT"], "www", safe_domain_name(domain) + ".conf")
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if os.path.exists(nginx_conf_custom_include):
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nginx_conf_extra += "\tinclude %s;\n" % (nginx_conf_custom_include)
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# PUT IT ALL TOGETHER
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# Combine the pieces. Iteratively place each template into the "# ADDITIONAL DIRECTIVES HERE" placeholder
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# of the previous template.
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nginx_conf = "# ADDITIONAL DIRECTIVES HERE\n"
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for t in templates + [nginx_conf_extra]:
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nginx_conf = re.sub("[ \t]*# ADDITIONAL DIRECTIVES HERE *\n", t, nginx_conf)
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# Replace substitution strings in the template & return.
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nginx_conf = nginx_conf.replace("$STORAGE_ROOT", env['STORAGE_ROOT'])
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nginx_conf = nginx_conf.replace("$HOSTNAME", domain)
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nginx_conf = nginx_conf.replace("$ROOT", root)
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nginx_conf = nginx_conf.replace("$SSL_KEY", ssl_key)
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nginx_conf = nginx_conf.replace("$SSL_CERTIFICATE", ssl_certificate)
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nginx_conf = nginx_conf.replace("$REDIRECT_DOMAIN", re.sub(r"^www\.", "", domain)) # for default www redirects to parent domain
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return nginx_conf
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def get_web_root(domain, env, test_exists=True):
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# Try STORAGE_ROOT/web/domain_name if it exists, but fall back to STORAGE_ROOT/web/default.
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for test_domain in (domain, 'default'):
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root = os.path.join(env["STORAGE_ROOT"], "www", safe_domain_name(test_domain))
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if os.path.exists(root) or not test_exists: break
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return root
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def get_domain_ssl_files(domain, env, allow_shared_cert=True):
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# What SSL private key will we use? Allow the user to override this, but
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# in many cases using the same private key for all domains would be fine.
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# Don't allow the user to override the key for PRIMARY_HOSTNAME because
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# that's what's in the main file.
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ssl_key = os.path.join(env["STORAGE_ROOT"], 'ssl/ssl_private_key.pem')
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ssl_key_is_alt = False
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alt_key = os.path.join(env["STORAGE_ROOT"], 'ssl/%s/private_key.pem' % safe_domain_name(domain))
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if domain != env['PRIMARY_HOSTNAME'] and os.path.exists(alt_key):
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ssl_key = alt_key
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ssl_key_is_alt = True
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# What SSL certificate will we use?
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ssl_certificate_primary = os.path.join(env["STORAGE_ROOT"], 'ssl/ssl_certificate.pem')
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ssl_via = None
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if domain == env['PRIMARY_HOSTNAME']:
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# For PRIMARY_HOSTNAME, use the one we generated at set-up time.
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ssl_certificate = ssl_certificate_primary
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else:
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# For other domains, we'll probably use a certificate in a different path.
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ssl_certificate = os.path.join(env["STORAGE_ROOT"], 'ssl/%s/ssl_certificate.pem' % safe_domain_name(domain))
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# But we can be smart and reuse the main SSL certificate if is has
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# a Subject Alternative Name matching this domain. Don't do this if
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# the user has uploaded a different private key for this domain.
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if not ssl_key_is_alt and allow_shared_cert:
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from status_checks import check_certificate
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if check_certificate(domain, ssl_certificate_primary, None, just_check_domain=True)[0] == "OK":
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ssl_certificate = ssl_certificate_primary
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ssl_via = "Using multi/wildcard certificate of %s." % env['PRIMARY_HOSTNAME']
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# For a 'www.' domain, see if we can reuse the cert of the parent.
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elif domain.startswith('www.'):
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ssl_certificate_parent = os.path.join(env["STORAGE_ROOT"], 'ssl/%s/ssl_certificate.pem' % safe_domain_name(domain[4:]))
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if os.path.exists(ssl_certificate_parent) and check_certificate(domain, ssl_certificate_parent, None, just_check_domain=True)[0] == "OK":
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ssl_certificate = ssl_certificate_parent
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ssl_via = "Using multi/wildcard certificate of %s." % domain[4:]
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return ssl_key, ssl_certificate, ssl_via
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def ensure_ssl_certificate_exists(domain, ssl_key, ssl_certificate, env):
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# For domains besides PRIMARY_HOSTNAME, generate a self-signed certificate if
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# a certificate doesn't already exist. See setup/mail.sh for documentation.
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if domain == env['PRIMARY_HOSTNAME']:
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return
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# Sanity check. Shouldn't happen. A non-primary domain might use this
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# certificate (see above), but then the certificate should exist anyway.
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if ssl_certificate == os.path.join(env["STORAGE_ROOT"], 'ssl/ssl_certificate.pem'):
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return
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if os.path.exists(ssl_certificate):
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return
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os.makedirs(os.path.dirname(ssl_certificate), exist_ok=True)
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# Generate a new self-signed certificate using the same private key that we already have.
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# Start with a CSR written to a temporary file.
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with tempfile.NamedTemporaryFile(mode="w") as csr_fp:
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csr_fp.write(create_csr(domain, ssl_key, env))
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csr_fp.flush() # since we won't close until after running 'openssl x509', since close triggers delete.
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# And then make the certificate.
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shell("check_call", [
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"openssl", "x509", "-req",
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"-days", "365",
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"-in", csr_fp.name,
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"-signkey", ssl_key,
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"-out", ssl_certificate])
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def create_csr(domain, ssl_key, env):
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return shell("check_output", [
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"openssl", "req", "-new",
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"-key", ssl_key,
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"-sha256",
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"-subj", "/C=%s/ST=/L=/O=/CN=%s" % (env["CSR_COUNTRY"], domain)])
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def install_cert(domain, ssl_cert, ssl_chain, env):
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if domain not in get_web_domains(env):
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return "Invalid domain name."
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# Write the combined cert+chain to a temporary path and validate that it is OK.
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# The certificate always goes above the chain.
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import tempfile, os
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fd, fn = tempfile.mkstemp('.pem')
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os.write(fd, (ssl_cert + '\n' + ssl_chain).encode("ascii"))
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os.close(fd)
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# Do validation on the certificate before installing it.
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from status_checks import check_certificate
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ssl_key, ssl_certificate, ssl_via = get_domain_ssl_files(domain, env, allow_shared_cert=False)
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cert_status, cert_status_details = check_certificate(domain, fn, ssl_key)
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if cert_status != "OK":
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if cert_status == "SELF-SIGNED":
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cert_status = "This is a self-signed certificate. I can't install that."
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os.unlink(fn)
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if cert_status_details is not None:
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cert_status += " " + cert_status_details
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return cert_status
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# Copy the certificate to its expected location.
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os.makedirs(os.path.dirname(ssl_certificate), exist_ok=True)
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shutil.move(fn, ssl_certificate)
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ret = ["OK"]
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# When updating the cert for PRIMARY_HOSTNAME, also update DNS because it is
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# used in the DANE TLSA record and restart postfix and dovecot which use
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# that certificate.
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if domain == env['PRIMARY_HOSTNAME']:
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ret.append( do_dns_update(env) )
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shell('check_call', ["/usr/sbin/service", "postfix", "restart"])
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shell('check_call', ["/usr/sbin/service", "dovecot", "restart"])
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ret.append("mail services restarted")
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# Kick nginx so it sees the cert.
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ret.append( do_web_update(env) )
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return "\n".join(ret)
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def get_web_domains_info(env):
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has_root_proxy_or_redirect = get_web_domains_with_root_overrides(env)
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# for the SSL config panel, get cert status
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def check_cert(domain):
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from status_checks import check_certificate
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ssl_key, ssl_certificate, ssl_via = get_domain_ssl_files(domain, env)
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if not os.path.exists(ssl_certificate):
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return ("danger", "No Certificate Installed")
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cert_status, cert_status_details = check_certificate(domain, ssl_certificate, ssl_key)
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if cert_status == "OK":
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if not ssl_via:
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return ("success", "Signed & valid. " + cert_status_details)
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else:
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# This is an alternate domain but using the same cert as the primary domain.
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return ("success", "Signed & valid. " + ssl_via)
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elif cert_status == "SELF-SIGNED":
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return ("warning", "Self-signed. Get a signed certificate to stop warnings.")
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else:
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return ("danger", "Certificate has a problem: " + cert_status)
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return [
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{
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"domain": domain,
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"root": get_web_root(domain, env),
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"custom_root": get_web_root(domain, env, test_exists=False),
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"ssl_certificate": check_cert(domain),
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"static_enabled": domain not in has_root_proxy_or_redirect,
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}
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for domain in get_web_domains(env)
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] + \
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[
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{
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"domain": domain,
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"ssl_certificate": check_cert(domain),
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"static_enabled": False,
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}
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for domain in get_default_www_redirects(env)
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]
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