prosody
494577d883ff
plugins/mod_dialback.lua

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plugins/mod_dialback.lua @ 12591:494577d883ff

util.table: Fix inaccurate comment Probably a duplicate of the comment next to Lmove, recorded by mistake Lpack can probably be removed at some point in the near future once we are confident it is not used anywhere.
author Kim Alvefur <zash@zash.se>
date Mon, 11 Jul 2022 20:02:10 +0200
parent 11679:d9499b7bcd54
child 12977:74b9e05af71e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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
b1885732e979 GPL->MIT!
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6 -- COPYING file in the source package for more information.
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cccd610a0ef9 Insert copyright/license headers
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7 --
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8
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9 local hosts = _G.hosts;
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10
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11 local log = module._log;
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fa4a51fe6442 Remove an incorrect line which I didn't add, and fix the proper way. Corrects the sending of stanzas over unauthed s2sout's. Also fixes mod_dialback to send stanzas and not strings.
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12
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13 local st = require "util.stanza";
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14 local sha256_hash = require "util.hashes".sha256;
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15 local sha256_hmac = require "util.hashes".hmac_sha256;
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16 local secure_equals = require "util.hashes".equals;
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17 local nameprep = require "util.encodings".stringprep.nameprep;
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18 local uuid_gen = require"util.uuid".generate;
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19
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20 local xmlns_stream = "http://etherx.jabber.org/streams";
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21
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22 local dialback_requests = setmetatable({}, { __mode = 'v' });
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23
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24 local dialback_secret = sha256_hash(module:get_option_string("dialback_secret", uuid_gen()), true);
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25
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26 function module.save()
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27 return { dialback_secret = dialback_secret };
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28 end
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29
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30 function module.restore(state)
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31 dialback_secret = state.dialback_secret;
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32 end
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33
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34 function generate_dialback(id, to, from)
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35 return sha256_hmac(dialback_secret, to .. ' ' .. from .. ' ' .. id, true);
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36 end
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37
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38 function initiate_dialback(session)
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39 -- generate dialback key
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40 session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host);
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41 session.sends2s(st.stanza("db:result", { from = session.from_host, to = session.to_host }):text(session.dialback_key));
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42 session.log("debug", "sent dialback key on outgoing s2s stream");
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43 end
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44
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45 function verify_dialback(id, to, from, key)
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46 return secure_equals(key, generate_dialback(id, to, from));
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47 end
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48
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49 module:hook("stanza/jabber:server:dialback:verify", function(event)
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50 local origin, stanza = event.origin, event.stanza;
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51
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52 if origin.type == "s2sin_unauthed" or origin.type == "s2sin" then
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53 -- We are being asked to verify the key, to ensure it was generated by us
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54 origin.log("debug", "verifying that dialback key is ours...");
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55 local attr = stanza.attr;
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56 if attr.type then
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57 module:log("warn", "Ignoring incoming session from %s claiming a dialback key for %s is %s",
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58 origin.from_host or "(unknown)", attr.from or "(unknown)", attr.type);
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59 return true;
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60 end
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61 -- COMPAT: Grr, ejabberd breaks this one too?? it is black and white in XEP-220 example 34
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62 --if attr.from ~= origin.to_host then error("invalid-from"); end
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63 local type;
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64 if verify_dialback(attr.id, attr.from, attr.to, stanza[1]) then
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65 type = "valid"
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66 else
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67 type = "invalid"
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68 origin.log("warn", "Asked to verify a dialback key that was incorrect. An imposter is claiming to be %s?", attr.to);
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69 end
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70 origin.log("debug", "verified dialback key... it is %s", type);
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71 origin.sends2s(st.stanza("db:verify", { from = attr.to, to = attr.from, id = attr.id, type = type }):text(stanza[1]));
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72 return true;
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73 end
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74 end);
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75
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76 module:hook("stanza/jabber:server:dialback:result", function(event)
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77 local origin, stanza = event.origin, event.stanza;
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78
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79 if origin.type == "s2sin_unauthed" or origin.type == "s2sin" then
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80 -- They want to be identified through dialback
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81 -- We need to check the key with the Authoritative server
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82 local attr = stanza.attr;
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83 if not attr.to or not attr.from then
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84 origin.log("debug", "Missing Dialback addressing (from=%q, to=%q)", attr.from, attr.to);
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85 origin:close("improper-addressing");
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86 return true;
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87 end
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88 local to, from = nameprep(attr.to), nameprep(attr.from);
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89
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parents: 4761
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90 if not hosts[to] then
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91 -- Not a host that we serve
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92 origin.log("warn", "%s tried to connect to %s, which we don't serve", from, to);
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93 origin:close("host-unknown");
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94 return true;
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95 elseif not from then
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96 origin:close("improper-addressing");
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97 return true;
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98 end
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99
6301
2fdd71b08126 mod_dialback: Short-circuit dialback auth if certificate is considered valid
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parents: 6300
diff changeset
100
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101 origin.hosts[from] = { dialback_key = stanza[1] };
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102
4822
5ef05f32bc42 mod_s2s, s2smanager, mod_dialback: Move addition of session.send() on s2sin to after they are authenticated (thus from mod_s2s to s2smanager). Update mod_dialback to fire route/remote directly, as session.send() is no longer available for s2sin_unauthed. Fixes #291.
Matthew Wild <mwild1@gmail.com>
parents: 4761
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103 dialback_requests[from.."/"..origin.streamid] = origin;
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diff changeset
104
4822
5ef05f32bc42 mod_s2s, s2smanager, mod_dialback: Move addition of session.send() on s2sin to after they are authenticated (thus from mod_s2s to s2smanager). Update mod_dialback to fire route/remote directly, as session.send() is no longer available for s2sin_unauthed. Fixes #291.
Matthew Wild <mwild1@gmail.com>
parents: 4761
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105 -- COMPAT: ejabberd, gmail and perhaps others do not always set 'to' and 'from'
5ef05f32bc42 mod_s2s, s2smanager, mod_dialback: Move addition of session.send() on s2sin to after they are authenticated (thus from mod_s2s to s2smanager). Update mod_dialback to fire route/remote directly, as session.send() is no longer available for s2sin_unauthed. Fixes #291.
Matthew Wild <mwild1@gmail.com>
parents: 4761
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106 -- on streams. We fill in the session's to/from here instead.
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diff changeset
107 if not origin.from_host then
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parents: 4847
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108 origin.from_host = from;
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Matthew Wild <mwild1@gmail.com>
parents: 615
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109 end
cd2cab5400fc Add support for dialback piggy-backing. Fixes #37. Thanks to CShadowRun for helping me test :)
Matthew Wild <mwild1@gmail.com>
parents: 615
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110 if not origin.to_host then
4931
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Waqas Hussain <waqas20@gmail.com>
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111 origin.to_host = to;
4837
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Marco Cirillo <maranda@lightwitch.org>
parents: 4836
diff changeset
112 end
9f1fb34cd7f8 mod_dialback: make change a bit more wide, encompass to and from and reject with proper addressing when neither are there.
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parents: 4836
diff changeset
113
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5ef05f32bc42 mod_s2s, s2smanager, mod_dialback: Move addition of session.send() on s2sin to after they are authenticated (thus from mod_s2s to s2smanager). Update mod_dialback to fire route/remote directly, as session.send() is no longer available for s2sin_unauthed. Fixes #291.
Matthew Wild <mwild1@gmail.com>
parents: 4761
diff changeset
114 origin.log("debug", "asking %s if key %s belongs to them", from, stanza[1]);
5ef05f32bc42 mod_s2s, s2smanager, mod_dialback: Move addition of session.send() on s2sin to after they are authenticated (thus from mod_s2s to s2smanager). Update mod_dialback to fire route/remote directly, as session.send() is no longer available for s2sin_unauthed. Fixes #291.
Matthew Wild <mwild1@gmail.com>
parents: 4761
diff changeset
115 module:fire_event("route/remote", {
5ef05f32bc42 mod_s2s, s2smanager, mod_dialback: Move addition of session.send() on s2sin to after they are authenticated (thus from mod_s2s to s2smanager). Update mod_dialback to fire route/remote directly, as session.send() is no longer available for s2sin_unauthed. Fixes #291.
Matthew Wild <mwild1@gmail.com>
parents: 4761
diff changeset
116 from_host = to, to_host = from;
5ef05f32bc42 mod_s2s, s2smanager, mod_dialback: Move addition of session.send() on s2sin to after they are authenticated (thus from mod_s2s to s2smanager). Update mod_dialback to fire route/remote directly, as session.send() is no longer available for s2sin_unauthed. Fixes #291.
Matthew Wild <mwild1@gmail.com>
parents: 4761
diff changeset
117 stanza = st.stanza("db:verify", { from = to, to = from, id = origin.streamid }):text(stanza[1]);
5ef05f32bc42 mod_s2s, s2smanager, mod_dialback: Move addition of session.send() on s2sin to after they are authenticated (thus from mod_s2s to s2smanager). Update mod_dialback to fire route/remote directly, as session.send() is no longer available for s2sin_unauthed. Fixes #291.
Matthew Wild <mwild1@gmail.com>
parents: 4761
diff changeset
118 });
3533
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Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
119 return true;
0385b9f29049 mod_dialback: Updated to use the new events API.
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
120 end
0385b9f29049 mod_dialback: Updated to use the new events API.
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
121 end);
191
e64c8a44060f Fix s2s once and for all
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parents:
diff changeset
122
3533
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Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
123 module:hook("stanza/jabber:server:dialback:verify", function(event)
0385b9f29049 mod_dialback: Updated to use the new events API.
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
124 local origin, stanza = event.origin, event.stanza;
5776
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Florian Zeitz <florob@babelmonkeys.de>
parents: 5362
diff changeset
125
3533
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parents: 2923
diff changeset
126 if origin.type == "s2sout_unauthed" or origin.type == "s2sout" then
621
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parents: 615
diff changeset
127 local attr = stanza.attr;
4314
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parents: 4227
diff changeset
128 local dialback_verifying = dialback_requests[attr.from.."/"..(attr.id or "")];
1e1110840965 mod_dialback: More robust handling of multiple outstanding dialback requests for the same domain, fixes intermittent s2s with some (patched?) ejabberds
Matthew Wild <mwild1@gmail.com>
parents: 4227
diff changeset
129 if dialback_verifying and attr.from == origin.to_host then
219
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Waqas Hussain <waqas20@gmail.com>
parents: 191
diff changeset
130 local valid;
f06e97f525bc Fixed some whitespace.
Waqas Hussain <waqas20@gmail.com>
parents: 191
diff changeset
131 if attr.type == "valid" then
11526
15a3db955ad3 s2s et al.: Add counters for connection state transitions
Jonas Schäfer <jonas@wielicki.name>
parents: 10380
diff changeset
132 module:fire_event("s2s-authenticated", { session = dialback_verifying, host = attr.from, mechanism = "dialback" });
219
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Waqas Hussain <waqas20@gmail.com>
parents: 191
diff changeset
133 valid = "valid";
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Waqas Hussain <waqas20@gmail.com>
parents: 191
diff changeset
134 else
f06e97f525bc Fixed some whitespace.
Waqas Hussain <waqas20@gmail.com>
parents: 191
diff changeset
135 -- Warn the original connection that is was not verified successfully
4993
5243b74a4cbb Hopefully inert commit to clean up logging across a number of modules, removing all cases of concatenation when building log messages
Matthew Wild <mwild1@gmail.com>
parents: 4931
diff changeset
136 log("warn", "authoritative server for %s denied the key", attr.from or "(unknown)");
219
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Waqas Hussain <waqas20@gmail.com>
parents: 191
diff changeset
137 valid = "invalid";
191
e64c8a44060f Fix s2s once and for all
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
138 end
5113
3393cab2dd6b mod_dialback: Correctly check if a connection was destroyed (thanks iron)
Kim Alvefur <zash@zash.se>
parents: 5019
diff changeset
139 if dialback_verifying.destroyed then
8516
83cab25465e6 mod_dialback: Expand abbrevation
Kim Alvefur <zash@zash.se>
parents: 8515
diff changeset
140 log("warn", "Incoming s2s session %s was closed in the meantime, so we can't notify it of the dialback result",
8515
cbb5f4488b1b mod_dialback: Split long line [luacheck]
Kim Alvefur <zash@zash.se>
parents: 8514
diff changeset
141 tostring(dialback_verifying):match("%w+$"));
347
fba39fda0879 Don't error if the original s2s connection has closed before we get the dialback result
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parents: 260
diff changeset
142 else
621
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Matthew Wild <mwild1@gmail.com>
parents: 615
diff changeset
143 dialback_verifying.sends2s(
560
6c07f15a34f4 Fix the last couple of places where we send strings from mod_dialback
Matthew Wild <mwild1@gmail.com>
parents: 559
diff changeset
144 st.stanza("db:result", { from = attr.to, to = attr.from, id = attr.id, type = valid })
621
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Matthew Wild <mwild1@gmail.com>
parents: 615
diff changeset
145 :text(dialback_verifying.hosts[attr.from].dialback_key));
347
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Matthew Wild <mwild1@gmail.com>
parents: 260
diff changeset
146 end
4314
1e1110840965 mod_dialback: More robust handling of multiple outstanding dialback requests for the same domain, fixes intermittent s2s with some (patched?) ejabberds
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parents: 4227
diff changeset
147 dialback_requests[attr.from.."/"..(attr.id or "")] = nil;
219
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parents: 191
diff changeset
148 end
3533
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Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
149 return true;
0385b9f29049 mod_dialback: Updated to use the new events API.
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parents: 2923
diff changeset
150 end
0385b9f29049 mod_dialback: Updated to use the new events API.
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
151 end);
191
e64c8a44060f Fix s2s once and for all
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parents:
diff changeset
152
3533
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Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
153 module:hook("stanza/jabber:server:dialback:result", function(event)
0385b9f29049 mod_dialback: Updated to use the new events API.
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
154 local origin, stanza = event.origin, event.stanza;
5776
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Florian Zeitz <florob@babelmonkeys.de>
parents: 5362
diff changeset
155
3533
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Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
156 if origin.type == "s2sout_unauthed" or origin.type == "s2sout" then
621
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Matthew Wild <mwild1@gmail.com>
parents: 615
diff changeset
157 -- Remote server is telling us whether we passed dialback
5776
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Florian Zeitz <florob@babelmonkeys.de>
parents: 5362
diff changeset
158
621
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Matthew Wild <mwild1@gmail.com>
parents: 615
diff changeset
159 local attr = stanza.attr;
cd2cab5400fc Add support for dialback piggy-backing. Fixes #37. Thanks to CShadowRun for helping me test :)
Matthew Wild <mwild1@gmail.com>
parents: 615
diff changeset
160 if not hosts[attr.to] then
cd2cab5400fc Add support for dialback piggy-backing. Fixes #37. Thanks to CShadowRun for helping me test :)
Matthew Wild <mwild1@gmail.com>
parents: 615
diff changeset
161 origin:close("host-unknown");
3533
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parents: 2923
diff changeset
162 return true;
621
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Matthew Wild <mwild1@gmail.com>
parents: 615
diff changeset
163 elseif hosts[attr.to].s2sout[attr.from] ~= origin then
cd2cab5400fc Add support for dialback piggy-backing. Fixes #37. Thanks to CShadowRun for helping me test :)
Matthew Wild <mwild1@gmail.com>
parents: 615
diff changeset
164 -- This isn't right
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parents: 615
diff changeset
165 origin:close("invalid-id");
3533
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parents: 2923
diff changeset
166 return true;
621
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Matthew Wild <mwild1@gmail.com>
parents: 615
diff changeset
167 end
219
f06e97f525bc Fixed some whitespace.
Waqas Hussain <waqas20@gmail.com>
parents: 191
diff changeset
168 if stanza.attr.type == "valid" then
11526
15a3db955ad3 s2s et al.: Add counters for connection state transitions
Jonas Schäfer <jonas@wielicki.name>
parents: 10380
diff changeset
169 module:fire_event("s2s-authenticated", { session = origin, host = attr.from, mechanism = "dialback" });
219
f06e97f525bc Fixed some whitespace.
Waqas Hussain <waqas20@gmail.com>
parents: 191
diff changeset
170 else
4227
6b83ef6ec845 mod_dialback: Use session:close() on dialback failure instead of s2smanager.destroy_session() (thanks Zash)
Matthew Wild <mwild1@gmail.com>
parents: 3534
diff changeset
171 origin:close("not-authorized", "dialback authentication failed");
219
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Waqas Hussain <waqas20@gmail.com>
parents: 191
diff changeset
172 end
3533
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Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
173 return true;
0385b9f29049 mod_dialback: Updated to use the new events API.
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
174 end
0385b9f29049 mod_dialback: Updated to use the new events API.
Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
175 end);
1876
6d33e0521667 mod_dialback: Initiate dialback on incoming stream:features
Matthew Wild <mwild1@gmail.com>
parents: 1523
diff changeset
176
8517
980d2daf3ed4 mod_dialback: Ignore unused arguments [luacheck]
Kim Alvefur <zash@zash.se>
parents: 8516
diff changeset
177 module:hook_tag("urn:ietf:params:xml:ns:xmpp-sasl", "failure", function (origin, stanza) -- luacheck: ignore 212/stanza
8509
e1d274001855 Backed out changeset 89c42aff8510: The problem in ejabberd has reportedly been resolved and this change causes more problems than it solves (fixes #1006)
Kim Alvefur <zash@zash.se>
parents: 8455
diff changeset
178 if origin.external_auth == "failed" then
e1d274001855 Backed out changeset 89c42aff8510: The problem in ejabberd has reportedly been resolved and this change causes more problems than it solves (fixes #1006)
Kim Alvefur <zash@zash.se>
parents: 8455
diff changeset
179 module:log("debug", "SASL EXTERNAL failed, falling back to dialback");
e1d274001855 Backed out changeset 89c42aff8510: The problem in ejabberd has reportedly been resolved and this change causes more problems than it solves (fixes #1006)
Kim Alvefur <zash@zash.se>
parents: 8455
diff changeset
180 initiate_dialback(origin);
e1d274001855 Backed out changeset 89c42aff8510: The problem in ejabberd has reportedly been resolved and this change causes more problems than it solves (fixes #1006)
Kim Alvefur <zash@zash.se>
parents: 8455
diff changeset
181 return true;
e1d274001855 Backed out changeset 89c42aff8510: The problem in ejabberd has reportedly been resolved and this change causes more problems than it solves (fixes #1006)
Kim Alvefur <zash@zash.se>
parents: 8455
diff changeset
182 end
e1d274001855 Backed out changeset 89c42aff8510: The problem in ejabberd has reportedly been resolved and this change causes more problems than it solves (fixes #1006)
Kim Alvefur <zash@zash.se>
parents: 8455
diff changeset
183 end, 100);
e1d274001855 Backed out changeset 89c42aff8510: The problem in ejabberd has reportedly been resolved and this change causes more problems than it solves (fixes #1006)
Kim Alvefur <zash@zash.se>
parents: 8455
diff changeset
184
8517
980d2daf3ed4 mod_dialback: Ignore unused arguments [luacheck]
Kim Alvefur <zash@zash.se>
parents: 8516
diff changeset
185 module:hook_tag(xmlns_stream, "features", function (origin, stanza) -- luacheck: ignore 212/stanza
3651
337391d34b70 s2s: SASL EXTERNAL
Paul Aurich <paul@darkrain42.org>
parents: 3534
diff changeset
186 if not origin.external_auth or origin.external_auth == "failed" then
4587
93a84314c296 mod_dialback, mod_s2s: Log initiation of dialback in mod_dialback
Kim Alvefur <zash@zash.se>
parents: 4586
diff changeset
187 module:log("debug", "Initiating dialback...");
4567
24617f360200 mod_dialback: import util.hashes and functionality once in s2smanager.
Florian Zeitz <florob@babelmonkeys.de>
parents: 4316
diff changeset
188 initiate_dialback(origin);
3651
337391d34b70 s2s: SASL EXTERNAL
Paul Aurich <paul@darkrain42.org>
parents: 3534
diff changeset
189 return true;
337391d34b70 s2s: SASL EXTERNAL
Paul Aurich <paul@darkrain42.org>
parents: 3534
diff changeset
190 end
3534
c68590b13a6d mod_dialback: Fixed indentation.
Waqas Hussain <waqas20@gmail.com>
parents: 3533
diff changeset
191 end, 100);
1937
9c700500f408 mod_dialback: Catch s2s-stream-features and add dialback feature
Matthew Wild <mwild1@gmail.com>
parents: 1876
diff changeset
192
5341
760c22c822be mod_s2s, mod_dialback: Rename s2s-authenticate-legacy event to s2sout-authenticate-legacy for clarity. Also, hello!
Matthew Wild <mwild1@gmail.com>
parents: 5113
diff changeset
193 module:hook("s2sout-authenticate-legacy", function (event)
4587
93a84314c296 mod_dialback, mod_s2s: Log initiation of dialback in mod_dialback
Kim Alvefur <zash@zash.se>
parents: 4586
diff changeset
194 module:log("debug", "Initiating dialback...");
4584
9a5de6509aa8 mod_s2s, mod_dialback: Event on pre-XMPP streams, so we can try dialback.
Kim Alvefur <zash@zash.se>
parents: 4579
diff changeset
195 initiate_dialback(event.origin);
9a5de6509aa8 mod_s2s, mod_dialback: Event on pre-XMPP streams, so we can try dialback.
Kim Alvefur <zash@zash.se>
parents: 4579
diff changeset
196 return true;
9a5de6509aa8 mod_s2s, mod_dialback: Event on pre-XMPP streams, so we can try dialback.
Kim Alvefur <zash@zash.se>
parents: 4579
diff changeset
197 end, 100);
9a5de6509aa8 mod_s2s, mod_dialback: Event on pre-XMPP streams, so we can try dialback.
Kim Alvefur <zash@zash.se>
parents: 4579
diff changeset
198
1937
9c700500f408 mod_dialback: Catch s2s-stream-features and add dialback feature
Matthew Wild <mwild1@gmail.com>
parents: 1876
diff changeset
199 -- Offer dialback to incoming hosts
9c700500f408 mod_dialback: Catch s2s-stream-features and add dialback feature
Matthew Wild <mwild1@gmail.com>
parents: 1876
diff changeset
200 module:hook("s2s-stream-features", function (data)
4264
fa36e749749c mod_dialback: Remove <optional/> from stream feature, as per latest specs.
Waqas Hussain <waqas20@gmail.com>
parents: 4238
diff changeset
201 data.features:tag("dialback", { xmlns='urn:xmpp:features:dialback' }):up();
3534
c68590b13a6d mod_dialback: Fixed indentation.
Waqas Hussain <waqas20@gmail.com>
parents: 3533
diff changeset
202 end);