prosody
f965ac6b7ce1
plugins/mod_tls.lua

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plugins/mod_tls.lua @ 5685:f965ac6b7ce1

mod_tls: Refactor to allow separate SSL configuration for c2s and s2s connections
author Kim Alvefur <zash@zash.se>
date Thu, 13 Jun 2013 17:47:45 +0200
parent 5378:ec3accda44d3
child 5698:4a244d10a3ca
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- Prosody IM
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b7049746bd29 Update copyright headers for 2010
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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b1885732e979 GPL->MIT!
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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ef86ba720f00 mod_tls: Let hosts without an 'ssl' option inherit it from their parent hosts.
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9 local config = require "core.configmanager";
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10 local create_context = require "core.certmanager".create_context;
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11 local st = require "util.stanza";
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12
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13 local secure_auth_only = module:get_option("c2s_require_encryption") or module:get_option("require_encryption");
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14 local secure_s2s_only = module:get_option("s2s_require_encryption");
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15 local allow_s2s_tls = module:get_option("s2s_allow_encryption") ~= false;
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16
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17 local xmlns_starttls = 'urn:ietf:params:xml:ns:xmpp-tls';
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18 local starttls_attr = { xmlns = xmlns_starttls };
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19 local starttls_proceed = st.stanza("proceed", starttls_attr);
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20 local starttls_failure = st.stanza("failure", starttls_attr);
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21 local c2s_feature = st.stanza("starttls", starttls_attr);
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22 local s2s_feature = st.stanza("starttls", starttls_attr);
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23 if secure_auth_only then c2s_feature:tag("required"):up(); end
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24 if secure_s2s_only then s2s_feature:tag("required"):up(); end
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25
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26 local hosts = prosody.hosts;
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27 local host = hosts[module.host];
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28
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29 local ssl_ctx_c2s, ssl_ctx_s2sout, ssl_ctx_s2sin;
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30 do
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31 local function get_ssl_cfg(typ)
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32 local cfg_key = (typ and typ.."_" or "").."ssl";
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33 local ssl_config = config.rawget(module.host, cfg_key);
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34 if not ssl_config then
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35 local base_host = module.host:match("%.(.*)");
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36 ssl_config = config.get(base_host, cfg_key);
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37 end
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38 return ssl_config or typ and get_ssl_cfg();
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39 end
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40
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41 local ssl_config, err = get_ssl_cfg("c2s");
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42 ssl_ctx_c2s, err = create_context(host.host, "server", ssl_config); -- for incoming client connections
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43 if err then module:log("error", "Error creating context for c2s: %s", err); end
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44
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45 ssl_config = get_ssl_cfg("s2s");
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46 ssl_ctx_s2sin, err = create_context(host.host, "server", ssl_config); -- for incoming server connections
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47 ssl_ctx_s2sout = create_context(host.host, "client", ssl_config); -- for outgoing server connections
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48 if err then module:log("error", "Error creating context for s2s: %s", err); end -- Both would have the same issue
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49 end
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50
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51 local function can_do_tls(session)
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52 if not session.conn.starttls then
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53 return false;
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54 elseif session.ssl_ctx then
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55 return true;
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56 end
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57 if session.type == "c2s_unauthed" then
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58 module:log("debug", "session.ssl_ctx = ssl_ctx_c2s;")
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59 session.ssl_ctx = ssl_ctx_c2s;
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60 elseif session.type == "s2sin_unauthed" and allow_s2s_tls then
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61 session.ssl_ctx = ssl_ctx_s2sin;
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62 elseif session.direction == "outgoing" and allow_s2s_tls then
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63 session.ssl_ctx = ssl_ctx_s2sout;
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64 else
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65 return false;
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66 end
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67 return session.ssl_ctx;
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68 end
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69
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70 -- Hook <starttls/>
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71 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-tls:starttls", function(event)
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72 local origin = event.origin;
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73 if can_do_tls(origin) then
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74 (origin.sends2s or origin.send)(starttls_proceed);
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75 origin:reset_stream();
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76 origin.conn:starttls(origin.ssl_ctx);
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77 origin.log("debug", "TLS negotiation started for %s...", origin.type);
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78 origin.secure = false;
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79 else
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80 origin.log("warn", "Attempt to start TLS, but TLS is not available on this %s connection", origin.type);
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81 (origin.sends2s or origin.send)(starttls_failure);
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82 origin:close();
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83 end
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84 return true;
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85 end);
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86
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87 -- Advertize stream feature
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88 module:hook("stream-features", function(event)
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89 local origin, features = event.origin, event.features;
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90 if can_do_tls(origin) then
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91 features:add_child(c2s_feature);
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92 end
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93 end);
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94 module:hook("s2s-stream-features", function(event)
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95 local origin, features = event.origin, event.features;
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96 if can_do_tls(origin) then
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97 features:add_child(s2s_feature);
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98 end
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99 end);
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100
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101 -- For s2sout connections, start TLS if we can
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102 module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza)
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103 module:log("debug", "Received features element");
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104 if can_do_tls(session) and stanza:child_with_ns(xmlns_starttls) then
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105 module:log("debug", "%s is offering TLS, taking up the offer...", session.to_host);
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106 session.sends2s("<starttls xmlns='"..xmlns_starttls.."'/>");
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107 return true;
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108 end
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109 end, 500);
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110
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111 module:hook_stanza(xmlns_starttls, "proceed", function (session, stanza)
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112 module:log("debug", "Proceeding with TLS on s2sout...");
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113 session:reset_stream();
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114 session.conn:starttls(session.ssl_ctx);
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115 session.secure = false;
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116 return true;
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117 end);