prosody
7ae000fc8c07
util/sslconfig.lua

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util/sslconfig.lua @ 13267:7ae000fc8c07 0.12

mod_muc_mam: Improve wording of enable setting Suggested by jstein in the chat This option label is used by XMPP clients to explain what the option does. a) The user should know where the data is archived. b) The user needs a statement that can be enabled/disabled by the variable. A question would have the wrong logic here.
author Kim Alvefur <zash@zash.se>
date Sun, 15 Oct 2023 14:43:11 +0200
parent 10920:c171b4c59bd1
child 12480:7e9ebdc75ce4
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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
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21 -- replaces the old.
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23
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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 };