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 _, k in ipairs(t[1] and t or DN_order) do
  74                                 local v = t[k];
  75                                 if v then
  76                                         s = s .. ("%s = %s\n"):format(k, v);
  77                                 end
  78                         end
  79                 else
  80                         for k, v in pairs(t) do
  81                                 s = s .. ("%s = %s\n"):format(k, v);
  82                         end
  83                 end
  84                 s = s .. "\n";
  85         end
  86         return s;
  87 end
  88
  89 local function utf8string(s)
  90         -- This is how we tell openssl not to encode UTF-8 strings as fake Latin1
  91         return s_format("FORMAT:UTF8,UTF8:%s", s);
  92 end
  93
  94 local function ia5string(s)
  95         return s_format("IA5STRING:%s", s);
  96 end
  97
  98 _M.util = {
  99         utf8string = utf8string,
 100         ia5string = ia5string,
 101 };
 102
 103 function ssl_config:add_dNSName(host)
 104         t_insert(self.subject_alternative_name.DNS, idna_to_ascii(host));
 105 end
 106
 107 function ssl_config:add_sRVName(host, service)
 108         t_insert(self.subject_alternative_name.otherName,
 109                 s_format("%s;%s", oid_dnssrv, ia5string("_" .. service .. "." .. idna_to_ascii(host))));
 110 end
 111
 112 function ssl_config:add_xmppAddr(host)
 113         t_insert(self.subject_alternative_name.otherName,
 114                 s_format("%s;%s", oid_xmppaddr, utf8string(host)));
 115 end
 116
 117 function ssl_config:from_prosody(hosts, config, certhosts)
 118         -- TODO Decide if this should go elsewhere
 119         local found_matching_hosts = false;
 120         for i = 1, #certhosts do
 121                 local certhost = certhosts[i];
 122                 for name in pairs(hosts) do
 123                         if name == certhost or name:sub(-1-#certhost) == "." .. certhost then
 124                                 found_matching_hosts = true;
 125                                 self:add_dNSName(name);
 126                                 --print(name .. "#component_module: " .. (config.get(name, "component_module") or "nil"));
 127                                 if config.get(name, "component_module") == nil then
 128                                         self:add_sRVName(name, "xmpp-client");
 129                                 end
 130                                 --print(name .. "#anonymous_login: " .. tostring(config.get(name, "anonymous_login")));
 131                                 if not (config.get(name, "anonymous_login") or
 132                                                 config.get(name, "authentication") == "anonymous") then
 133                                         self:add_sRVName(name, "xmpp-server");
 134                                 end
 135                                 self:add_xmppAddr(name);
 136                         end
 137                 end
 138         end
 139         if not found_matching_hosts then
 140                 return nil, "no-matching-hosts";
 141         end
 142 end
 143
 144 do -- Lua to shell calls.
 145         local function shell_escape(s)
 146                 return "'" .. tostring(s):gsub("'",[['\'']]) .. "'";
 147         end
 148
 149         local function serialize(command, args)
 150                 local commandline = { "openssl", command };
 151                 for k, v in pairs(args) do
 152                         if type(k) == "string" then
 153                                 t_insert(commandline, ("-%s"):format(k));
 154                                 if v ~= true then
 155                                         t_insert(commandline, shell_escape(v));
 156                                 end
 157                         end
 158                 end
 159                 for _, v in ipairs(args) do
 160                         t_insert(commandline, shell_escape(v));
 161                 end
 162                 return t_concat(commandline, " ");
 163         end
 164
 165         local os_execute = os.execute;
 166         setmetatable(_M, {
 167                 __index = function(_, command)
 168                         return function(opts)
 169                                 local ret = os_execute(serialize(command, type(opts) == "table" and opts or {}));
 170                                 return ret == true or ret == 0;
 171                         end;
 172                 end;
 173         });
 174 end
 175
 176 return _M;