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annotate mod_s2s_auth_posh/mod_s2s_auth_posh.lua @ 4594:1da63fe35ef3

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mod_auth_http: Format README better
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Wed, 16 Jun 2021 17:32:43 +0200
parents 58a112bd9792
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 local redirect_followed = false;
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50 local function cb (response, code)
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51 if code ~= 200 then
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52 log("debug", "No or invalid POSH response received");
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53 resume();
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54 return;
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55 end
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56 log("debug", "Received POSH response");
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57 local jwk = json.decode(response);
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58 if not jwk or type(jwk) ~= "table" then
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59 log("error", "POSH response is not valid JSON!\n%s", tostring(response));
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60 resume();
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61 return;
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62 end
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63 if type(jwk.url) == "string" then
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64 if redirect_followed then
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65 redirect_followed = true;
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66 http.request(jwk.url, nil, cb);
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67 else
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68 log("error", "POSH had invalid redirect:\n%s", tostring(response));
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69 resume();
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70 return;
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71 end
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72 end
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73
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74 host_session.posh = { orig = response };
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75 jwk.expires = os.time() + tonumber(jwk.expires) or 3600;
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76 host_session.posh.jwk = jwk;
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77 cache:set(target_host, jwk);
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78 resume();
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79 end
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80 http.request(url, nil, cb);
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81 return true;
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82 end
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83
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84 -- Do POSH authentication
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85 module:hook("s2s-check-certificate", function (event)
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86 local session, cert = event.session, event.cert;
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87 local log = session.log or module._log;
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88 if session.cert_identity_status == "valid" then
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89 log("debug", "Not trying POSH because certificate is already valid");
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90 return;
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91 end
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92
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93 log("info", "Trying POSH authentication.");
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94 local wait, done = async.waiter();
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95 if posh_lookup(session, done) then
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96 wait();
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97 end
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98 local posh = session.posh;
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99 local jwk = posh and posh.jwk;
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100 local fingerprints = jwk and jwk.fingerprints;
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101
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102 if type(fingerprints) ~= "table" then
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103 log("debug", "No POSH authentication data available");
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104 return;
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105 end
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106
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107 local cert_der = pem2der(cert:pem());
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108 local cert_hashes = {};
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109 for i = 1, #hash_order do
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110 cert_hashes[i] = base64.encode(hash_funcs[i](cert_der));
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111 end
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112 for i = 1, #fingerprints do
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113 local fp = fingerprints[i];
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114 for j = 1, #hash_order do
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115 local hash = fp[hash_order[j]];
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116 if cert_hashes[j] == hash then
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117 session.cert_chain_status = "valid";
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118 session.cert_identity_status = "valid";
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119 log("debug", "POSH authentication succeeded!");
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120 return true;
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121 elseif hash then
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122 -- Don't try weaker hashes
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123 break;
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124 end
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125 end
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126 end
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127
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128 log("debug", "POSH authentication failed!");
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129 end);
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130
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131 function module.command(arg)
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132 if not arg[1] then
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133 print("Usage: mod_s2s_auth_posh /path/to/cert.pem")
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134 return 1;
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135 end
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136 local jwkset = { fingerprints = { }; expires = 86400; }
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137
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138 for i, cert_file in ipairs(arg) do
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139 local cert, err = io.open(cert_file);
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140 if not cert then
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141 io.stderr:write(err, "\n");
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142 return 1;
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143 end
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144 local cert_pem = cert:read("*a");
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145 local cert_der, typ = pem2der(cert_pem);
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146 if typ == "CERTIFICATE" then
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147 jwkset.fingerprints[i] = { ["sha-256"] = base64.encode(hashes.sha256(cert_der)); };
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148 elseif typ then
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149 io.stderr:write(cert_file, " contained a ", typ:lower(), ", was expecting a certificate\n");
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150 return 1;
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151 else
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152 io.stderr:write(cert_file, " did not contain a certificate in PEM format\n");
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153 return 1;
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154 end
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155 end
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156 print(json.encode(jwkset));
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157 return 0;
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158 end
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159