util/openssl.lua

   1 local type, tostring, pairs, ipairs = type, tostring, pairs, ipairs;
   2 local t_insert, t_concat = table.insert, table.concat;
   3 local s_format = string.format;
   4
   5 local oid_xmppaddr = "1.3.6.1.5.5.7.8.5"; -- [XMPP-CORE]
   6 local oid_dnssrv   = "1.3.6.1.5.5.7.8.7"; -- [SRV-ID]
   7
   8 local idna_to_ascii = require "util.encodings".idna.to_ascii;
   9
  10 local _M = {};
  11 local config = {};
  12 _M.config = config;
  13
  14 local ssl_config = {};
  15 local ssl_config_mt = {__index=ssl_config};
  16
  17 function config.new()
  18         return setmetatable({
  19                 req = {
  20                         distinguished_name = "distinguished_name",
  21                         req_extensions = "certrequest",
  22                         x509_extensions = "selfsigned",
  23                         prompt = "no",
  24                 },
  25                 distinguished_name = {
  26                         countryName = "GB",
  27                         -- stateOrProvinceName = "",
  28                         localityName = "The Internet",
  29                         organizationName = "Your Organisation",
  30                         organizationalUnitName = "XMPP Department",
  31                         commonName = "example.com",
  32                         emailAddress = "xmpp@example.com",
  33                 },
  34                 certrequest = {
  35                         basicConstraints = "CA:FALSE",
  36                         keyUsage = "digitalSignature,keyEncipherment",
  37                         extendedKeyUsage = "serverAuth,clientAuth",
  38                         subjectAltName = "@subject_alternative_name",
  39                 },
  40                 selfsigned = {
  41                         basicConstraints = "CA:TRUE",
  42                         subjectAltName = "@subject_alternative_name",
  43                 },
  44                 subject_alternative_name = {
  45                         DNS = {},
  46                         otherName = {},
  47                 },
  48         }, ssl_config_mt);
  49 end
  50
  51 local DN_order = {
  52         "countryName";
  53         "stateOrProvinceName";
  54         "localityName";
  55         "streetAddress";
  56         "organizationName";
  57         "organizationalUnitName";
  58         "commonName";
  59         "emailAddress";
  60 }
  61 _M._DN_order = DN_order;
  62 function ssl_config:serialize()
  63         local s = "";
  64         for k, t in pairs(self) do
  65                 s = s .. ("[%s]\n"):format(k);
  66                 if k == "subject_alternative_name" then
  67                         for san, n in pairs(t) do
  68                                 for i = 1,#n do
  69                                         s = s .. s_format("%s.%d = %s\n", san, i -1, n[i]);
  70                                 end
  71                         end
  72                 elseif k == "distinguished_name" then
  73                         for i=1,#DN_order do
  74                                 local k = DN_order[i]
  75                                 local v = t[k];
  76                                 if v then
  77                                         s = s .. ("%s = %s\n"):format(k, v);
  78                                 end
  79                         end
  80                 else
  81                         for k, v in pairs(t) do
  82                                 s = s .. ("%s = %s\n"):format(k, v);
  83                         end
  84                 end
  85                 s = s .. "\n";
  86         end
  87         return s;
  88 end
  89
  90 local function utf8string(s)
  91         -- This is how we tell openssl not to encode UTF-8 strings as fake Latin1
  92         return s_format("FORMAT:UTF8,UTF8:%s", s);
  93 end
  94
  95 local function ia5string(s)
  96         return s_format("IA5STRING:%s", s);
  97 end
  98
  99 _M.util = {
 100         utf8string = utf8string,
 101         ia5string = ia5string,
 102 };
 103
 104 function ssl_config:add_dNSName(host)
 105         t_insert(self.subject_alternative_name.DNS, idna_to_ascii(host));
 106 end
 107
 108 function ssl_config:add_sRVName(host, service)
 109         t_insert(self.subject_alternative_name.otherName,
 110                 s_format("%s;%s", oid_dnssrv, ia5string("_" .. service .."." .. idna_to_ascii(host))));
 111 end
 112
 113 function ssl_config:add_xmppAddr(host)
 114         t_insert(self.subject_alternative_name.otherName,
 115                 s_format("%s;%s", oid_xmppaddr, utf8string(host)));
 116 end
 117
 118 function ssl_config:from_prosody(hosts, config, certhosts)
 119         -- TODO Decide if this should go elsewhere
 120         local found_matching_hosts = false;
 121         for i = 1,#certhosts do
 122                 local certhost = certhosts[i];
 123                 for name in pairs(hosts) do
 124                         if name == certhost or name:sub(-1-#certhost) == "."..certhost then
 125                                 found_matching_hosts = true;
 126                                 self:add_dNSName(name);
 127                                 --print(name .. "#component_module: " .. (config.get(name, "component_module") or "nil"));
 128                                 if config.get(name, "component_module") == nil then
 129                                         self:add_sRVName(name, "xmpp-client");
 130                                 end
 131                                 --print(name .. "#anonymous_login: " .. tostring(config.get(name, "anonymous_login")));
 132                                 if not (config.get(name, "anonymous_login") or
 133                                                 config.get(name, "authentication") == "anonymous") then
 134                                         self:add_sRVName(name, "xmpp-server");
 135                                 end
 136                                 self:add_xmppAddr(name);
 137                         end
 138                 end
 139         end
 140         if not found_matching_hosts then
 141                 return nil, "no-matching-hosts";
 142         end
 143 end
 144
 145 do -- Lua to shell calls.
 146         local function shell_escape(s)
 147                 return "'" .. tostring(s):gsub("'",[['\'']]) .. "'";
 148         end
 149
 150         local function serialize(command, args)
 151                 local commandline = { "openssl", command };
 152                 for k, v in pairs(args) do
 153                         if type(k) == "string" then
 154                                 t_insert(commandline, ("-%s"):format(k));
 155                                 if v ~= true then
 156                                         t_insert(commandline, shell_escape(v));
 157                                 end
 158                         end
 159                 end
 160                 for _, v in ipairs(args) do
 161                         t_insert(commandline, shell_escape(v));
 162                 end
 163                 return t_concat(commandline, " ");
 164         end
 165
 166         local os_execute = os.execute;
 167         setmetatable(_M, {
 168                 __index=function(_,f)
 169                         return function(opts)
 170                                 return 0 == os_execute(serialize(command, type(opts) == "table" and opts or {}));
 171                         end;
 172                 end;
 173         });
 174 end
 175
 176 return _M;