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annotate mod_s2s_auth_posh/mod_s2s_auth_posh.lua @ 5448:9d542e86e19a

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mod_http_oauth2: Allow requesting a subset of scopes on token refresh This enables clients to request access tokens with fewer permissions than the grant they were given, reducing impact of token leak. Clients could e.g. request access tokens with some privileges and immediately revoke them after use, or other strategies.
author Kim Alvefur <zash@zash.se>
date Thu, 11 May 2023 21:40:09 +0200
parents 58a112bd9792
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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
3199
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127
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128 log("debug", "POSH authentication failed!");
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129 end);
3225
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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
4441
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147 jwkset.fingerprints[i] = { ["sha-256"] = base64.encode(hashes.sha256(cert_der)); };
3225
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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