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annotate mod_s2s_auth_posh/mod_s2s_auth_posh.lua @ 3204:13f381f0c03f

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mod_s2s_auth_posh: Abort if no fingerprints are found
author Kim Alvefur <zash@zash.se>
date Thu, 21 Dec 2017 03:23:58 +0100
parents b3e82e2b818e
children 7bfb25111ea6
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f3e452b43cfe mod_s2s_auth_posh: PKIX over Secure HTTP
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1 -- Copyright (C) 2013 - 2014 Tobias Markmann
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2 -- This file is MIT/X11 licensed.
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3 --
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4 -- Implements authentication via POSH (PKIX over Secure HTTP)
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5 -- http://tools.ietf.org/html/draft-miller-posh-03
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6 --
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7 module:set_global();
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8 local json = require 'util.json'
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9
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10 local base64 = require"util.encodings".base64;
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11 local pem2der = require "util.x509".pem2der;
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12 local hashes = require"util.hashes";
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13 local build_url = require"socket.url".build;
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14 local async = require "util.async";
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15 local http = require"net.http";
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16
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17 local cache = require "util.cache".new(100);
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18
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19 local hash_order = { "sha-512", "sha-384", "sha-256", "sha-224", "sha-1" };
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20 local hash_funcs = { hashes.sha512, hashes.sha384, hashes.sha256, hashes.sha224, hashes.sha1 };
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21
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22 local function posh_lookup(host_session, resume)
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23 -- do nothing if posh info already exists
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24 if host_session.posh ~= nil then return end
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25
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26 local target_host = false;
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27 if host_session.direction == "incoming" then
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28 target_host = host_session.from_host;
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29 elseif host_session.direction == "outgoing" then
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30 target_host = host_session.to_host;
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31 end
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32
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33 local cached = cache:get(target_host);
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34 if cached then
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35 if os.time() > cached.expires then
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36 cache:set(target_host, nil);
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37 else
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38 host_session.posh = { jwk = cached };
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39 return false;
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40 end
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41 end
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42 local log = host_session.log or module._log;
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43
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44 log("debug", "Session direction: %s", tostring(host_session.direction));
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45
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46 local url = build_url { scheme = "https", host = target_host, path = "/.well-known/posh/xmpp-server.json" };
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47
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48 log("debug", "Request POSH information for %s", tostring(target_host));
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49 http.request(url, nil, function(response, code)
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50 if code ~= 200 then
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51 log("debug", "No or invalid POSH response received");
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52 resume();
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53 return;
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54 end
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55 log("debug", "Received POSH response");
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56 local jwk = json.decode(response);
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57 if not jwk then
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58 log("error", "POSH response is not valid JSON!\n%s", tostring(response));
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59 resume();
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60 return;
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61 end
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62 host_session.posh = { orig = response };
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63 jwk.expires = os.time() + tonumber(jwk.expires) or 3600;
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64 host_session.posh.jwk = jwk;
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65 cache:set(target_host, jwk);
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66 resume();
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67 end)
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68 return true;
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69 end
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70
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71 -- Do POSH authentication
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72 module:hook("s2s-check-certificate", function(event)
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73 local session, cert = event.session, event.cert;
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74 local log = session.log or module._log;
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75 if session.cert_identity_status == "valid" then
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76 log("debug", "Not trying POSH because certificate is already valid");
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77 return;
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78 end
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79
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80 log("info", "Trying POSH authentication.");
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81 local wait, done = async.waiter();
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82 if posh_lookup(session, done) then
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83 wait();
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84 end
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85 local posh = session.posh;
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86 local jwk = posh and posh.jwk;
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87 local fingerprints = jwk and jwk.fingerprints;
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88
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89 if not fingerprints then
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90 log("debug", "No POSH authentication data available");
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91 return;
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92 end
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93
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94 local cert_der = pem2der(cert:pem());
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95 local cert_hashes = {};
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96 for i = 1, #hash_order do
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97 cert_hashes[i] = base64.encode(hash_funcs[i](cert_der));
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98 end
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99 for i = 1, #fingerprints do
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100 local fp = fingerprints[i];
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101 for j = 1, #hash_order do
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102 local hash = fp[hash_order[j]];
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103 if cert_hashes[j] == hash then
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104 session.cert_chain_status = "valid";
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105 session.cert_identity_status = "valid";
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106 log("debug", "POSH authentication succeeded!");
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107 return true;
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108 elseif hash then
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109 -- Don't try weaker hashes
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110 break;
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111 end
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112 end
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113 end
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114
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115 log("debug", "POSH authentication failed!");
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116 end);