prosody
c171b4c59bd1
util/sslconfig.lua

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util/sslconfig.lua @ 10920:c171b4c59bd1

util.sslconfig: Process TLS 1.3-specific cipher list Same way as with other cipher list options
author Kim Alvefur <zash@zash.se>
date Sun, 07 Jun 2020 02:14:55 +0200
parent 9584:2860f8dabf35
child 12480:7e9ebdc75ce4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 t_concat = table.concat;
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7 local t_insert = table.insert;
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8 local setmetatable = setmetatable;
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9
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10 local _ENV = nil;
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11 -- luacheck: std none
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12
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13 local handlers = { };
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14 local finalisers = { };
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15 local id = function (v) return v end
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16
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17 -- All "handlers" behave like extended rawset(table, key, value) with extra
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18 -- processing usually merging the new value with the old in some reasonable
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19 -- way
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20 -- If a field does not have a defined handler then a new value simply
ddb03cc4ce04 util.sslconfig: More descriptive variable names and also comments
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21 -- replaces the old.
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24 -- Convert either a list or a set into a special type of set where each
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25 -- item is either positive or negative in order for a later set of options
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26 -- to be able to remove options from this set by filtering out the negative ones
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27 function handlers.options(config, field, new)
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28 local options = config[field] or { };
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29 if type(new) ~= "table" then new = { new } end
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30 for key, value in pairs(new) do
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31 if value == true or value == false then
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32 options[key] = value;
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33 else -- list item
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34 options[value] = true;
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35 end
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36 end
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37 config[field] = options;
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38 end
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39
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40 handlers.verifyext = handlers.options;
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41
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42 -- finalisers take something produced by handlers and return what luasec
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43 -- expects it to be
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44
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45 -- Produce a list of "positive" options from the set
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46 function finalisers.options(options)
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47 local output = {};
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48 for opt, enable in pairs(options) do
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49 if enable then
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50 output[#output+1] = opt;
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51 end
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52 end
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53 return output;
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54 end
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55
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56 finalisers.verifyext = finalisers.options;
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57
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58 -- We allow ciphers to be a list
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59
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60 function finalisers.ciphers(cipherlist)
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61 if type(cipherlist) == "table" then
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62 return t_concat(cipherlist, ":");
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63 end
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64 return cipherlist;
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65 end
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66
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67 -- Curve list too
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68 finalisers.curveslist = finalisers.ciphers;
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69
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70 -- TLS 1.3 ciphers
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71 finalisers.ciphersuites = finalisers.ciphers;
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72
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73 -- protocol = "x" should enable only that protocol
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74 -- protocol = "x+" should enable x and later versions
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75
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76 local protocols = { "sslv2", "sslv3", "tlsv1", "tlsv1_1", "tlsv1_2", "tlsv1_3" };
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77 for i = 1, #protocols do protocols[protocols[i] .. "+"] = i - 1; end
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78
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79 -- this interacts with ssl.options as well to add no_x
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80 local function protocol(config)
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81 local min_protocol = protocols[config.protocol];
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82 if min_protocol then
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83 config.protocol = "sslv23";
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84 for i = 1, min_protocol do
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85 t_insert(config.options, "no_"..protocols[i]);
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86 end
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87 end
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88 end
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89
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90 -- Merge options from 'new' config into 'config'
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91 local function apply(config, new)
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92 if type(new) == "table" then
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93 for field, value in pairs(new) do
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94 (handlers[field] or rawset)(config, field, value);
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95 end
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96 end
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97 end
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98
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99 -- Finalize the config into the form LuaSec expects
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100 local function final(config)
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101 local output = { };
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102 for field, value in pairs(config) do
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103 output[field] = (finalisers[field] or id)(value);
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104 end
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105 -- Need to handle protocols last because it adds to the options list
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106 protocol(output);
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107 return output;
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108 end
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109
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110 local sslopts_mt = {
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111 __index = {
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112 apply = apply;
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113 final = final;
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114 };
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115 };
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116
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117 local function new()
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118 return setmetatable({options={}}, sslopts_mt);
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119 end
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120
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121 return {
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122 apply = apply;
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123 final = final;
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124 new = new;
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125 };