prosody
d50bee584969
util/sslconfig.lua

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util/sslconfig.lua @ 13269:d50bee584969

mod_cron: Remove unused import [luacheck] Use of datetime was removed in 6ac5ad578565
author Kim Alvefur <zash@zash.se>
date Sun, 15 Oct 2023 16:41:25 +0200
parent 12975:d10957394a3c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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ddb03cc4ce04 util.sslconfig: More descriptive variable names and also comments
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1 -- util to easily merge multiple sets of LuaSec context options
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2
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3 local type = type;
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4 local pairs = pairs;
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5 local rawset = rawset;
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6 local rawget = rawget;
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7 local error = error;
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8 local t_concat = table.concat;
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9 local t_insert = table.insert;
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10 local setmetatable = setmetatable;
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11 local resolve_path = require"prosody.util.paths".resolve_relative_path;
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12
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13 local _ENV = nil;
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14 -- luacheck: std none
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15
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16 local handlers = { };
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17 local finalisers = { };
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18 local id = function (v) return v end
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19
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20 -- All "handlers" behave like extended rawset(table, key, value) with extra
ddb03cc4ce04 util.sslconfig: More descriptive variable names and also comments
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21 -- processing usually merging the new value with the old in some reasonable
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22 -- way
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23 -- If a field does not have a defined handler then a new value simply
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24 -- replaces the old.
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25
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26
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27 -- Convert either a list or a set into a special type of set where each
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28 -- item is either positive or negative in order for a later set of options
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29 -- to be able to remove options from this set by filtering out the negative ones
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30 function handlers.options(config, field, new)
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31 local options = config[field] or { };
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32 if type(new) ~= "table" then new = { new } end
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33 for key, value in pairs(new) do
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34 if value == true or value == false then
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35 options[key] = value;
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36 else -- list item
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37 options[value] = true;
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38 end
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39 end
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40 rawset(config, field, options)
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41 end
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42
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43 handlers.verifyext = handlers.options;
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44
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45 -- finalisers take something produced by handlers and return what luasec
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46 -- expects it to be
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47
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48 -- Produce a list of "positive" options from the set
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49 function finalisers.options(options)
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50 local output = {};
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51 for opt, enable in pairs(options) do
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52 if enable then
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53 output[#output+1] = opt;
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54 end
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55 end
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56 return output;
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57 end
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58
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59 finalisers.verifyext = finalisers.options;
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60
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61 -- We allow ciphers to be a list
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62
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63 function finalisers.ciphers(cipherlist)
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64 if type(cipherlist) == "table" then
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65 return t_concat(cipherlist, ":");
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66 end
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67 return cipherlist;
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68 end
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69
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70 -- Curve list too
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71 finalisers.curveslist = finalisers.ciphers;
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72
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73 -- TLS 1.3 ciphers
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74 finalisers.ciphersuites = finalisers.ciphers;
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75
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76 -- Path expansion
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77 function finalisers.key(path, config)
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78 if type(path) == "string" then
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79 return resolve_path(config._basedir, path);
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80 else
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81 return nil
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82 end
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83 end
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84 finalisers.certificate = finalisers.key;
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85 finalisers.cafile = finalisers.key;
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86 finalisers.capath = finalisers.key;
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87 -- XXX: copied from core/certmanager.lua, but this seems odd, because it would remove a dhparam function from the config
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88 finalisers.dhparam = finalisers.key;
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89
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90 -- protocol = "x" should enable only that protocol
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91 -- protocol = "x+" should enable x and later versions
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92
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93 local protocols = { "sslv2", "sslv3", "tlsv1", "tlsv1_1", "tlsv1_2", "tlsv1_3" };
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94 for i = 1, #protocols do protocols[protocols[i] .. "+"] = i - 1; end
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95
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96 -- this interacts with ssl.options as well to add no_x
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97 local function protocol(config)
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98 local min_protocol = protocols[config.protocol];
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99 if min_protocol then
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100 config.protocol = "sslv23";
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101 for i = 1, min_protocol do
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102 t_insert(config.options, "no_"..protocols[i]);
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103 end
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104 end
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105 end
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106
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107 -- Merge options from 'new' config into 'config'
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108 local function apply(config, new)
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109 rawset(config, "_cache", nil);
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110 if type(new) == "table" then
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111 for field, value in pairs(new) do
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112 -- exclude keys which are internal to the config builder
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113 if field:sub(1, 1) ~= "_" then
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114 (handlers[field] or rawset)(config, field, value);
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115 end
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116 end
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117 end
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118 return config
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119 end
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120
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121 -- Finalize the config into the form LuaSec expects
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122 local function final(config)
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123 local output = { };
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124 for field, value in pairs(config) do
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125 -- exclude keys which are internal to the config builder
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126 if field:sub(1, 1) ~= "_" then
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127 output[field] = (finalisers[field] or id)(value, config);
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128 end
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129 end
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130 -- Need to handle protocols last because it adds to the options list
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131 protocol(output);
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132 return output;
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133 end
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134
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135 local function build(config)
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136 local cached = rawget(config, "_cache");
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137 if cached then
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138 return cached, nil
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139 end
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140
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141 local ctx, err = rawget(config, "_context_factory")(config:final(), config);
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142 if ctx then
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143 rawset(config, "_cache", ctx);
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144 end
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145 return ctx, err
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146 end
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147
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148 local sslopts_mt = {
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149 __index = {
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150 apply = apply;
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151 final = final;
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152 build = build;
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153 };
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154 __newindex = function()
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155 error("SSL config objects cannot be modified directly. Use :apply()")
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156 end;
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157 };
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158
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159
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160 -- passing basedir through everything is required to avoid sslconfig depending
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161 -- on prosody.paths.config
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162 local function new(context_factory, basedir)
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163 return setmetatable({
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164 _context_factory = context_factory,
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165 _basedir = basedir,
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166 options={},
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167 }, sslopts_mt);
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168 end
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169
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170 local function clone(config)
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171 local result = new();
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172 for k, v in pairs(config) do
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173 -- note that we *do* copy the internal keys on clone -- we have to carry
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174 -- both the factory and the cache with us
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175 rawset(result, k, v);
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176 end
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177 return result
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178 end
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179
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180 sslopts_mt.__index.clone = clone;
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181
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182 return {
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183 apply = apply;
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184 final = final;
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185 _new = new;
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186 };