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 = "v3_extensions",
  22                         x509_extensions = "v3_extensions",
  23                         prompt = "no",
  24                 },
  25                 distinguished_name = {
  26                         commonName = "example.com",
  27                         countryName = "GB",
  28                         localityName = "The Internet",
  29                         organizationName = "Your Organisation",
  30                         organizationalUnitName = "XMPP Department",
  31                         emailAddress = "xmpp@example.com",
  32                 },
  33                 v3_extensions = {
  34                         basicConstraints = "CA:FALSE",
  35                         keyUsage = "digitalSignature,keyEncipherment",
  36                         extendedKeyUsage = "serverAuth,clientAuth",
  37                         subjectAltName = "@subject_alternative_name",
  38                 },
  39                 subject_alternative_name = {
  40                         DNS = {},
  41                         otherName = {},
  42                 },
  43         }, ssl_config_mt);
  44 end
  45
  46 function ssl_config:serialize()
  47         local s = "";
  48         for k, t in pairs(self) do
  49                 s = s .. ("[%s]\n"):format(k);
  50                 if k == "subject_alternative_name" then
  51                         for san, n in pairs(t) do
  52                                 for i = 1,#n do
  53                                         s = s .. s_format("%s.%d = %s\n", san, i -1, n[i]);
  54                                 end
  55                         end
  56                 else
  57                         for k, v in pairs(t) do
  58                                 s = s .. ("%s = %s\n"):format(k, v);
  59                         end
  60                 end
  61                 s = s .. "\n";
  62         end
  63         return s;
  64 end
  65
  66 local function utf8string(s)
  67         -- This is how we tell openssl not to encode UTF-8 strings as fake Latin1
  68         return s_format("FORMAT:UTF8,UTF8:%s", s);
  69 end
  70
  71 local function ia5string(s)
  72         return s_format("IA5STRING:%s", s);
  73 end
  74
  75 _M.util = {
  76         utf8string = utf8string,
  77         ia5string = ia5string,
  78 };
  79
  80 function ssl_config:add_dNSName(host)
  81         t_insert(self.subject_alternative_name.DNS, idna_to_ascii(host));
  82 end
  83
  84 function ssl_config:add_sRVName(host, service)
  85         t_insert(self.subject_alternative_name.otherName,
  86                 s_format("%s;%s", oid_dnssrv, ia5string("_" .. service .."." .. idna_to_ascii(host))));
  87 end
  88
  89 function ssl_config:add_xmppAddr(host)
  90         t_insert(self.subject_alternative_name.otherName,
  91                 s_format("%s;%s", oid_xmppaddr, utf8string(host)));
  92 end
  93
  94 function ssl_config:from_prosody(hosts, config, certhosts)
  95         -- TODO Decide if this should go elsewhere
  96         local found_matching_hosts = false;
  97         for i = 1,#certhosts do
  98                 local certhost = certhosts[i];
  99                 for name in pairs(hosts) do
 100                         if name == certhost or name:sub(-1-#certhost) == "."..certhost then
 101                                 found_matching_hosts = true;
 102                                 self:add_dNSName(name);
 103                                 --print(name .. "#component_module: " .. (config.get(name, "core", "component_module") or "nil"));
 104                                 if config.get(name, "core", "component_module") == nil then
 105                                         self:add_sRVName(name, "xmpp-client");
 106                                 end
 107                                 --print(name .. "#anonymous_login: " .. tostring(config.get(name, "core", "anonymous_login")));
 108                                 if not (config.get(name, "core", "anonymous_login") or
 109                                                 config.get(name, "core", "authentication") == "anonymous") then
 110                                         self:add_sRVName(name, "xmpp-server");
 111                                 end
 112                                 self:add_xmppAddr(name);
 113                         end
 114                 end
 115         end
 116         if not found_matching_hosts then
 117                 return nil, "no-matching-hosts";
 118         end
 119 end
 120
 121 do -- Lua to shell calls.
 122         local function shell_escape(s)
 123                 return s:gsub("'",[['\'']]);
 124         end
 125
 126         local function serialize(f,o)
 127                 local r = {"openssl", f};
 128                 for k,v in pairs(o) do
 129                         if type(k) == "string" then
 130                                 t_insert(r, ("-%s"):format(k));
 131                                 if v ~= true then
 132                                         t_insert(r, ("'%s'"):format(shell_escape(tostring(v))));
 133                                 end
 134                         end
 135                 end
 136                 for _,v in ipairs(o) do
 137                         t_insert(r, ("'%s'"):format(shell_escape(tostring(v))));
 138                 end
 139                 return t_concat(r, " ");
 140         end
 141
 142         local os_execute = os.execute;
 143         setmetatable(_M, {
 144                 __index=function(_,f)
 145                         return function(opts)
 146                                 return 0 == os_execute(serialize(f, type(opts) == "table" and opts or {}));
 147                         end;
 148                 end;
 149         });
 150 end
 151
 152 return _M;