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                         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                 v3_extensions = {
  35                         basicConstraints = "CA:FALSE",
  36                         keyUsage = "digitalSignature,keyEncipherment",
  37                         extendedKeyUsage = "serverAuth,clientAuth",
  38                         subjectAltName = "@subject_alternative_name",
  39                 },
  40                 subject_alternative_name = {
  41                         DNS = {},
  42                         otherName = {},
  43                 },
  44         }, ssl_config_mt);
  45 end
  46
  47 local DN_order = {
  48         "countryName";
  49         "stateOrProvinceName";
  50         "localityName";
  51         "streetAddress";
  52         "organizationName";
  53         "organizationalUnitName";
  54         "commonName";
  55         "emailAddress";
  56 }
  57 _M._DN_order = DN_order;
  58 function ssl_config:serialize()
  59         local s = "";
  60         for k, t in pairs(self) do
  61                 s = s .. ("[%s]\n"):format(k);
  62                 if k == "subject_alternative_name" then
  63                         for san, n in pairs(t) do
  64                                 for i = 1,#n do
  65                                         s = s .. s_format("%s.%d = %s\n", san, i -1, n[i]);
  66                                 end
  67                         end
  68                 elseif k == "distinguished_name" then
  69                         for i=1,#DN_order do
  70                                 local k = DN_order[i]
  71                                 local v = t[k];
  72                                 if v then
  73                                         s = s .. ("%s = %s\n"):format(k, v);
  74                                 end
  75                         end
  76                 else
  77                         for k, v in pairs(t) do
  78                                 s = s .. ("%s = %s\n"):format(k, v);
  79                         end
  80                 end
  81                 s = s .. "\n";
  82         end
  83         return s;
  84 end
  85
  86 local function utf8string(s)
  87         -- This is how we tell openssl not to encode UTF-8 strings as fake Latin1
  88         return s_format("FORMAT:UTF8,UTF8:%s", s);
  89 end
  90
  91 local function ia5string(s)
  92         return s_format("IA5STRING:%s", s);
  93 end
  94
  95 _M.util = {
  96         utf8string = utf8string,
  97         ia5string = ia5string,
  98 };
  99
 100 function ssl_config:add_dNSName(host)
 101         t_insert(self.subject_alternative_name.DNS, idna_to_ascii(host));
 102 end
 103
 104 function ssl_config:add_sRVName(host, service)
 105         t_insert(self.subject_alternative_name.otherName,
 106                 s_format("%s;%s", oid_dnssrv, ia5string("_" .. service .."." .. idna_to_ascii(host))));
 107 end
 108
 109 function ssl_config:add_xmppAddr(host)
 110         t_insert(self.subject_alternative_name.otherName,
 111                 s_format("%s;%s", oid_xmppaddr, utf8string(host)));
 112 end
 113
 114 function ssl_config:from_prosody(hosts, config, certhosts)
 115         -- TODO Decide if this should go elsewhere
 116         local found_matching_hosts = false;
 117         for i = 1,#certhosts do
 118                 local certhost = certhosts[i];
 119                 for name in pairs(hosts) do
 120                         if name == certhost or name:sub(-1-#certhost) == "."..certhost then
 121                                 found_matching_hosts = true;
 122                                 self:add_dNSName(name);
 123                                 --print(name .. "#component_module: " .. (config.get(name, "component_module") or "nil"));
 124                                 if config.get(name, "component_module") == nil then
 125                                         self:add_sRVName(name, "xmpp-client");
 126                                 end
 127                                 --print(name .. "#anonymous_login: " .. tostring(config.get(name, "anonymous_login")));
 128                                 if not (config.get(name, "anonymous_login") or
 129                                                 config.get(name, "authentication") == "anonymous") then
 130                                         self:add_sRVName(name, "xmpp-server");
 131                                 end
 132                                 self:add_xmppAddr(name);
 133                         end
 134                 end
 135         end
 136         if not found_matching_hosts then
 137                 return nil, "no-matching-hosts";
 138         end
 139 end
 140
 141 do -- Lua to shell calls.
 142         local function shell_escape(s)
 143                 return s:gsub("'",[['\'']]);
 144         end
 145
 146         local function serialize(f,o)
 147                 local r = {"openssl", f};
 148                 for k,v in pairs(o) do
 149                         if type(k) == "string" then
 150                                 t_insert(r, ("-%s"):format(k));
 151                                 if v ~= true then
 152                                         t_insert(r, ("'%s'"):format(shell_escape(tostring(v))));
 153                                 end
 154                         end
 155                 end
 156                 for _,v in ipairs(o) do
 157                         t_insert(r, ("'%s'"):format(shell_escape(tostring(v))));
 158                 end
 159                 return t_concat(r, " ");
 160         end
 161
 162         local os_execute = os.execute;
 163         setmetatable(_M, {
 164                 __index=function(_,f)
 165                         return function(opts)
 166                                 return 0 == os_execute(serialize(f, type(opts) == "table" and opts or {}));
 167                         end;
 168                 end;
 169         });
 170 end
 171
 172 return _M;