prosody
0419de4e4db1
plugins/mod_dialback.lua

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plugins/mod_dialback.lua @ 13241:0419de4e4db1

mod_storage_sql: Pass variables as arguments instead of upvalues Probably a workaround for the lack of argument passing when using xpcall in Lua 5.1, no longer relevant.
author Kim Alvefur <zash@zash.se>
date Sat, 22 Jul 2023 15:22:54 +0200
parent 12977:74b9e05af71e
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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diff changeset
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 "prosody.util.stanza";
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14 local sha256_hash = require "prosody.util.hashes".sha256;
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15 local sha256_hmac = require "prosody.util.hashes".hmac_sha256;
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16 local secure_equals = require "prosody.util.hashes".equals;
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17 local nameprep = require "prosody.util.encodings".stringprep.nameprep;
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18 local uuid_gen = require"prosody.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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parents: 4993
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56 if attr.type then
017e864b459d mod_dialback: Ignore <db:verify/> with a 'type' attribute on incoming connections, instead of interpreting them as a request to verify a key
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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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parents:
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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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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.
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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;
621
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parents: 615
diff changeset
98 end
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parents: 6306
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99
6301
2fdd71b08126 mod_dialback: Short-circuit dialback auth if certificate is considered valid
Kim Alvefur <zash@zash.se>
parents: 6300
diff changeset
100
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101 origin.hosts[from] = { dialback_key = stanza[1] };
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diff changeset
102
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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
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103 dialback_requests[from.."/"..origin.streamid] = origin;
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Florian Zeitz <florob@babelmonkeys.de>
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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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parents: 615
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
diff changeset
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
diff changeset
110 if not origin.to_host then
4931
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Waqas Hussain <waqas20@gmail.com>
parents: 4851
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111 origin.to_host = to;
4837
9f1fb34cd7f8 mod_dialback: make change a bit more wide, encompass to and from and reject with proper addressing when neither are there.
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.
Marco Cirillo <maranda@lightwitch.org>
parents: 4836
diff changeset
113
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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.
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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)
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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
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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
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parents: 10380
diff changeset
132 module:fire_event("s2s-authenticated", { session = dialback_verifying, host = attr.from, mechanism = "dialback" });
219
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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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parents: 2923
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149 return true;
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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
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parents: 2923
diff changeset
153 module:hook("stanza/jabber:server:dialback:result", function(event)
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Waqas Hussain <waqas20@gmail.com>
parents: 2923
diff changeset
154 local origin, stanza = event.origin, event.stanza;
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Florian Zeitz <florob@babelmonkeys.de>
parents: 5362
diff changeset
155
3533
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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;
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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);