prosody
a2081d28bd22
plugins/mod_tls.lua

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plugins/mod_tls.lua @ 7834:a2081d28bd22

mod_tls: Verify that TLS is available before proceeding
author Kim Alvefur <zash@zash.se>
date Mon, 23 Jan 2017 10:46:42 +0100
parent 7833:94c0c8649826
child 7863:a634fe3c21f2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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Matthew Wild <mwild1@gmail.com>
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1 -- Prosody IM
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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
3571
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
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9 local create_context = require "core.certmanager".create_context;
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10 local rawgetopt = require"core.configmanager".rawget;
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11 local st = require "util.stanza";
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12
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13 local c2s_require_encryption = module:get_option("c2s_require_encryption", module:get_option("require_encryption"));
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14 local s2s_require_encryption = 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 local s2s_secure_auth = module:get_option("s2s_secure_auth");
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17
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18 if s2s_secure_auth and s2s_require_encryption == false then
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19 module:log("warn", "s2s_secure_auth implies s2s_require_encryption, but s2s_require_encryption is set to false");
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20 s2s_require_encryption = true;
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21 end
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22
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23 local xmlns_starttls = 'urn:ietf:params:xml:ns:xmpp-tls';
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24 local starttls_attr = { xmlns = xmlns_starttls };
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25 local starttls_initiate= st.stanza("starttls", starttls_attr);
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26 local starttls_proceed = st.stanza("proceed", starttls_attr);
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27 local starttls_failure = st.stanza("failure", starttls_attr);
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28 local c2s_feature = st.stanza("starttls", starttls_attr);
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29 local s2s_feature = st.stanza("starttls", starttls_attr);
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30 if c2s_require_encryption then c2s_feature:tag("required"):up(); end
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31 if s2s_require_encryption then s2s_feature:tag("required"):up(); end
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32
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33 local hosts = prosody.hosts;
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34 local host = hosts[module.host];
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35
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36 local ssl_ctx_c2s, ssl_ctx_s2sout, ssl_ctx_s2sin;
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37 local ssl_cfg_c2s, ssl_cfg_s2sout, ssl_cfg_s2sin;
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38 do
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39 local NULL, err = {};
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40 local modhost = module.host;
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41 local parent = modhost:match("%.(.*)$");
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42
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43 local parent_ssl = rawgetopt(parent, "ssl") or NULL;
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44 local host_ssl = rawgetopt(modhost, "ssl") or parent_ssl;
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45
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46 local global_c2s = rawgetopt("*", "c2s_ssl") or NULL;
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47 local parent_c2s = rawgetopt(parent, "c2s_ssl") or NULL;
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48 local host_c2s = rawgetopt(modhost, "c2s_ssl") or parent_c2s;
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49
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50 local global_s2s = rawgetopt("*", "s2s_ssl") or NULL;
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51 local parent_s2s = rawgetopt(parent, "s2s_ssl") or NULL;
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52 local host_s2s = rawgetopt(modhost, "s2s_ssl") or parent_s2s;
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53
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54 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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55 if not ssl_ctx_c2s then module:log("error", "Error creating context for c2s: %s", err); end
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56
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57 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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58 if not ssl_ctx_s2sout then module:log("error", "Error creating contexts for s2sout: %s", err); end
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59
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60 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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61 if not ssl_ctx_s2sin then module:log("error", "Error creating contexts for s2sin: %s", err); end
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62 end
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63
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64 local function can_do_tls(session)
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65 if session.ssl_ctx == false or not session.conn.starttls then
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66 return false;
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67 elseif session.ssl_ctx then
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68 return true;
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69 end
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70 if session.type == "c2s_unauthed" then
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71 session.ssl_ctx = ssl_ctx_c2s;
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72 session.ssl_cfg = ssl_cfg_c2s;
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73 elseif session.type == "s2sin_unauthed" and allow_s2s_tls then
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74 session.ssl_ctx = ssl_ctx_s2sin;
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75 session.ssl_cfg = ssl_cfg_s2sin;
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76 elseif session.direction == "outgoing" and allow_s2s_tls then
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77 session.ssl_ctx = ssl_ctx_s2sout;
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78 session.ssl_cfg = ssl_cfg_s2sout;
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79 else
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80 return false;
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81 end
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82 return session.ssl_ctx;
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83 end
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84
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85 -- Hook <starttls/>
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86 module:hook("stanza/urn:ietf:params:xml:ns:xmpp-tls:starttls", function(event)
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87 local origin = event.origin;
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88 if can_do_tls(origin) then
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89 (origin.sends2s or origin.send)(starttls_proceed);
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90 origin:reset_stream();
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91 origin.conn:starttls(origin.ssl_ctx);
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92 origin.log("debug", "TLS negotiation started for %s...", origin.type);
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93 origin.secure = false;
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94 else
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95 origin.log("warn", "Attempt to start TLS, but TLS is not available on this %s connection", origin.type);
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96 (origin.sends2s or origin.send)(starttls_failure);
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97 origin:close();
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98 end
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99 return true;
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100 end);
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101
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102 -- Advertize stream feature
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103 module:hook("stream-features", function(event)
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104 local origin, features = event.origin, event.features;
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105 if can_do_tls(origin) then
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106 features:add_child(c2s_feature);
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107 end
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108 end);
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109 module:hook("s2s-stream-features", function(event)
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parents: 2607
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110 local origin, features = event.origin, event.features;
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03287c06d986 mod_tls: Refactor to simplify detection of whether we can do TLS on a connection
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111 if can_do_tls(origin) then
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parents: 2604
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112 features:add_child(s2s_feature);
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113 end
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parents: 2604
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114 end);
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parents: 1675
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115
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parents: 1675
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116 -- For s2sout connections, start TLS if we can
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parents: 2604
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117 module:hook_stanza("http://etherx.jabber.org/streams", "features", function (session, stanza)
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parents: 2604
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118 module:log("debug", "Received features element");
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76699a0ae4c4 mod_lastactivity, mod_legacyauth, mod_presence, mod_saslauth, mod_tls: Use the newer stanza:get_child APIs and optimize away some table lookups
Kim Alvefur <zash@zash.se>
parents: 6296
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119 if can_do_tls(session) and stanza:get_child("starttls", xmlns_starttls) then
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7341cc5c8da9 mod_tls: Fix log statement (thanks Zash)
Matthew Wild <mwild1@gmail.com>
parents: 4244
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120 module:log("debug", "%s is offering TLS, taking up the offer...", session.to_host);
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b6eff3ba13de mod_tls: Build <starttls/> as a stanza instead of with string concatenation
Kim Alvefur <zash@zash.se>
parents: 6526
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121 session.sends2s(starttls_initiate);
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122 return true;
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123 end
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parents: 2604
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124 end, 500);
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parents: 1675
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125
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Kim Alvefur <zash@zash.se>
parents: 6919
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126 module:hook_stanza(xmlns_starttls, "proceed", function (session, stanza) -- luacheck: ignore 212/stanza
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Kim Alvefur <zash@zash.se>
parents: 7833
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127 if session.type == "s2sout_unauthed" and can_do_tls(session) then
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94c0c8649826 mod_tls: Only accept <proceed> on outgoing s2s connections
Kim Alvefur <zash@zash.se>
parents: 7712
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128 module:log("debug", "Proceeding with TLS on s2sout...");
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Kim Alvefur <zash@zash.se>
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129 session:reset_stream();
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Kim Alvefur <zash@zash.se>
parents: 7712
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130 session.conn:starttls(session.ssl_ctx);
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Kim Alvefur <zash@zash.se>
parents: 7712
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131 session.secure = false;
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parents: 7712
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132 return true;
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parents: 7712
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133 end
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134 end);