prosody
b6eff3ba13de
plugins/mod_tls.lua

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plugins/mod_tls.lua @ 6709:b6eff3ba13de

mod_tls: Build <starttls/> as a stanza instead of with string concatenation
author Kim Alvefur <zash@zash.se>
date Mon, 18 May 2015 21:43:24 +0200
parent 6526:873538f0b18c
child 6710:d062314446f6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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841d61be198f Remove version number from copyright headers
Matthew Wild <mwild1@gmail.com>
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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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675d65036f31 certmanager, hostmanager, mod_tls: Move responsibility for creating per-host SSL contexts to mod_tls, meaning reloading certs is now as trivial as reloading mod_tls
Matthew Wild <mwild1@gmail.com>
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9 local create_context = require "core.certmanager".create_context;
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10 local st = require "util.stanza";
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11
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edc63dc72566 mod_legacyauth, mod_saslauth, mod_tls: Pass require_encryption as default option to s2s_require_encryption so the later overrides the former
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12 local c2s_require_encryption = module:get_option("c2s_require_encryption", module:get_option("require_encryption"));
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13 local s2s_require_encryption = module:get_option("s2s_require_encryption");
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14 local allow_s2s_tls = module:get_option("s2s_allow_encryption") ~= false;
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15 local s2s_secure_auth = module:get_option("s2s_secure_auth");
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16
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17 if s2s_secure_auth and s2s_require_encryption == false then
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18 module:log("warn", "s2s_secure_auth implies s2s_require_encryption, but s2s_require_encryption is set to false");
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19 s2s_require_encryption = true;
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20 end
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21
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22 local xmlns_starttls = 'urn:ietf:params:xml:ns:xmpp-tls';
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23 local starttls_attr = { xmlns = xmlns_starttls };
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24 local starttls_initiate= st.stanza("starttls", starttls_attr);
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25 local starttls_proceed = st.stanza("proceed", starttls_attr);
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26 local starttls_failure = st.stanza("failure", starttls_attr);
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27 local c2s_feature = st.stanza("starttls", starttls_attr);
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28 local s2s_feature = st.stanza("starttls", starttls_attr);
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29 if c2s_require_encryption then c2s_feature:tag("required"):up(); end
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30 if s2s_require_encryption then s2s_feature:tag("required"):up(); end
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31
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32 local hosts = prosody.hosts;
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33 local host = hosts[module.host];
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34
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35 local ssl_ctx_c2s, ssl_ctx_s2sout, ssl_ctx_s2sin;
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36 local ssl_cfg_c2s, ssl_cfg_s2sout, ssl_cfg_s2sin;
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37 do
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38 local NULL, err = {};
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39 local global = module:context("*");
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40 local parent = module:context(module.host:match("%.(.*)$"));
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41
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42 local parent_ssl = parent:get_option("ssl");
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43 local host_ssl = module:get_option("ssl", parent_ssl);
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44
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45 local global_c2s = global:get_option("c2s_ssl", NULL);
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46 local parent_c2s = parent:get_option("c2s_ssl", NULL);
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47 local host_c2s = module:get_option("c2s_ssl", parent_c2s);
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48
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49 local global_s2s = global:get_option("s2s_ssl", NULL);
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50 local parent_s2s = parent:get_option("s2s_ssl", NULL);
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51 local host_s2s = module:get_option("s2s_ssl", parent_s2s);
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52
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53 ssl_ctx_c2s, err, ssl_cfg_c2s = create_context(host.host, "server", host_c2s, host_ssl, global_c2s); -- for incoming client connections
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54 if not ssl_ctx_c2s then module:log("error", "Error creating context for c2s: %s", err); end
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55
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56 ssl_ctx_s2sout, err, ssl_cfg_s2sout = create_context(host.host, "client", host_s2s, host_ssl, global_s2s); -- for outgoing server connections
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57 if not ssl_ctx_s2sout then module:log("error", "Error creating contexts for s2sout: %s", err); end
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58
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59 ssl_ctx_s2sin, err, ssl_cfg_s2sin = create_context(host.host, "server", host_s2s, host_ssl, global_s2s); -- for incoming server connections
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60 if not ssl_ctx_s2sin then module:log("error", "Error creating contexts for s2sin: %s", err); end
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61 end
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62
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63 local function can_do_tls(session)
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64 if not session.conn.starttls then
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65 return false;
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66 elseif session.ssl_ctx then
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67 return true;
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68 end
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69 if session.type == "c2s_unauthed" then
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70 session.ssl_ctx = ssl_ctx_c2s;
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71 session.ssl_cfg = ssl_cfg_c2s;
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72 elseif session.type == "s2sin_unauthed" and allow_s2s_tls then
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73 session.ssl_ctx = ssl_ctx_s2sin;
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74 session.ssl_cfg = ssl_cfg_s2sin;
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75 elseif session.direction == "outgoing" and allow_s2s_tls then
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76 session.ssl_ctx = ssl_ctx_s2sout;
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77 session.ssl_cfg = ssl_cfg_s2sout;
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78 else
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79 return false;
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80 end
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81 return session.ssl_ctx;
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82 end
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83
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84 -- Hook <starttls/>
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85 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-tls:starttls", function(event)
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86 local origin = event.origin;
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87 if can_do_tls(origin) then
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88 (origin.sends2s or origin.send)(starttls_proceed);
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89 origin:reset_stream();
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90 origin.conn:starttls(origin.ssl_ctx);
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91 origin.log("debug", "TLS negotiation started for %s...", origin.type);
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92 origin.secure = false;
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93 else
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94 origin.log("warn", "Attempt to start TLS, but TLS is not available on this %s connection", origin.type);
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95 (origin.sends2s or origin.send)(starttls_failure);
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96 origin:close();
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97 end
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98 return true;
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99 end);
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100
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101 -- Advertize stream feature
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102 module:hook("stream-features", function(event)
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103 local origin, features = event.origin, event.features;
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104 if can_do_tls(origin) then
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105 features:add_child(c2s_feature);
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106 end
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107 end);
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108 module:hook("s2s-stream-features", function(event)
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109 local origin, features = event.origin, event.features;
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110 if can_do_tls(origin) then
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111 features:add_child(s2s_feature);
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112 end
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113 end);
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114
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115 -- For s2sout connections, start TLS if we can
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116 module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza)
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117 module:log("debug", "Received features element");
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118 if can_do_tls(session) and stanza:get_child("starttls", xmlns_starttls) then
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119 module:log("debug", "%s is offering TLS, taking up the offer...", session.to_host);
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120 session.sends2s(starttls_initiate);
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121 return true;
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122 end
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123 end, 500);
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124
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125 module:hook_stanza(xmlns_starttls, "proceed", function (session, stanza)
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126 module:log("debug", "Proceeding with TLS on s2sout...");
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127 session:reset_stream();
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128 session.conn:starttls(session.ssl_ctx);
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129 session.secure = false;
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130 return true;
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131 end);