user.x509: Add some utility functions for generating OpenSSL configs

1 files changed, 109 insertions, 0 deletions

diff --git a/util/x509.lua b/util/x509.lua
index d3c55bb4..f106e6fa 100644
--- a/util/x509.lua
+++ b/util/x509.lua
@@ -21,6 +21,10 @@
 local nameprep = require "util.encodings".stringprep.nameprep;
 local idna_to_ascii = require "util.encodings".idna.to_ascii;
 local log = require "util.logger".init("x509");
+local pairs, ipairs = pairs, ipairs;
+local s_format = string.format;
+local t_insert = table.insert;
+local t_concat = table.concat;
 
 module "x509"
 
@@ -208,4 +212,109 @@ function verify_identity(host, service, cert)
 	return false
 end
 
+-- TODO Rename? Split out subroutines?
+-- Also, this is probably openssl specific, what TODO about that?
+function genx509san(hosts, config, certhosts, raw) -- recive config through that or some better way?
+	local function utf8string(s)
+		-- This is how we tell openssl not to encode UTF-8 strings as Latin1
+		return s_format("FORMAT:UTF8,UTF8:%s", s);
+	end
+
+	local function ia5string(s)
+		return s_format("IA5STRING:%s", s);
+	end
+
+	local function dnsname(t, host)
+		t_insert(t.DNS, idna_to_ascii(host));
+	end
+
+	local function srvname(t, host, service)
+		t_insert(t.otherName, s_format("%s;%s", oid_dnssrv, ia5string("_" .. service .."." .. idna_to_ascii(host))));
+	end
+
+	local function xmppAddr(t, host)
+		t_insert(t.otherName, s_format("%s;%s", oid_xmppaddr, utf8string(host)));
+	end
+
+	-----------------------------
+
+	local san = {
+		DNS = {};
+		otherName = {};
+	};
+
+	local sslsanconf = { };
+
+	for i = 1,#certhosts do
+		local certhost = certhosts[i];
+		for name, host in pairs(hosts) do
+			if name == certhost or name:sub(-1-#certhost) == "."..certhost then
+				dnsname(san, name);
+				--print(name .. "#component_module: " .. (config.get(name, "core", "component_module") or "nil"));
+				if config.get(name, "core", "component_module") == nil then
+					srvname(san, name, "xmpp-client");
+				end
+				--print(name .. "#anonymous_login: " .. tostring(config.get(name, "core", "anonymous_login")));
+				if not (config.get(name, "core", "anonymous_login") or
+						config.get(name, "core", "authentication") == "anonymous") then
+					srvname(san, name, "xmpp-server");
+				end
+				xmppAddr(san, name);
+			end
+		end
+	end
+
+	for t, n in pairs(san) do
+		for i = 1,#n do
+			t_insert(sslsanconf, s_format("%s.%d = %s", t, i -1, n[i]));
+		end
+	end
+
+	return raw and sslsanconf or t_concat(sslsanconf, "\n");
+end
+
+function baseconf()
+	return {
+		req = {
+			distinguished_name = "distinguished_name",
+			req_extensions = "v3_extensions",
+			x509_extensions = "v3_extensions",
+			prompt = "no",
+		},
+		distinguished_name = {
+			commonName = "example.com",
+			countryName = "GB",
+			localityName = "The Internet",
+			organizationName = "Your Organisation",
+			organizationalUnitName = "XMPP Department",
+			emailAddress = "xmpp@example.com",
+		},
+		v3_extensions = {
+			basicConstraints = "CA:FALSE",
+			keyUsage = "digitalSignature,keyEncipherment",
+			extendedKeyUsage = "serverAuth,clientAuth",
+			subjectAltName = "@subject_alternative_name",
+		},
+		subject_alternative_name = { },
+	}
+end
+
+function serialize_conf(conf)
+	local s = "";
+	for k, t in pairs(conf) do
+		s = s .. ("[%s]\n"):format(k);
+		if t[1] then
+			for i, v in ipairs(t) do
+				s = s .. ("%s\n"):format(v);
+			end
+		else
+			for k, v in pairs(t) do
+				s = s .. ("%s = %s\n"):format(k, v);
+			end
+		end
+		s = s .. "\n";
+	end
+	return s;
+end
+
 return _M;