prosody
b35714c57442
util/format.lua

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util/format.lua @ 12237:b35714c57442

tools.dnsregistry: For converting IANA DNS registry data to Lua table
author Kim Alvefur <zash@zash.se>
date Sun, 04 Oct 2020 19:26:53 +0200
parent 12221:056b7920b686
child 12261:f7946c8e502f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 --
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2 -- A string.format wrapper that gracefully handles invalid arguments since
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3 -- certain format string and argument combinations may casue errors or other
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4 -- issues like log spoofing
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5 --
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6 -- Provides some protection from e.g. CAPEC-135, CWE-117, CWE-134, CWE-93
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7
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8 local tostring = tostring;
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9 local unpack = table.unpack or unpack; -- luacheck: ignore 113/unpack
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10 local pack = require "util.table".pack; -- TODO table.pack in 5.2+
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11 local valid_utf8 = require "util.encodings".utf8.valid;
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12 local type = type;
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13 local dump = require "util.serialization".new("debug");
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14 local num_type = math.type or function (n)
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15 return n % 1 == 0 and n <= 9007199254740992 and n >= -9007199254740992 and "integer" or "float";
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16 end
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17
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18 -- In Lua 5.3+ these formats throw an error if given a float
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19 local expects_integer = { c = true, d = true, i = true, o = true, u = true, X = true, x = true, };
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20 -- In Lua 5.2 these throw an error given a negative number
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21 local expects_positive = { o = true; u = true; x = true; X = true };
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22 -- Printable Unicode replacements for control characters
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23 local control_symbols = {
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24 -- 0x00 .. 0x1F --> U+2400 .. U+241F, 0x7F --> U+2421
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25 ["\000"] = "\226\144\128", ["\001"] = "\226\144\129", ["\002"] = "\226\144\130",
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26 ["\003"] = "\226\144\131", ["\004"] = "\226\144\132", ["\005"] = "\226\144\133",
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27 ["\006"] = "\226\144\134", ["\007"] = "\226\144\135", ["\008"] = "\226\144\136",
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28 ["\009"] = "\226\144\137", ["\010"] = "\226\144\138", ["\011"] = "\226\144\139",
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29 ["\012"] = "\226\144\140", ["\013"] = "\226\144\141", ["\014"] = "\226\144\142",
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30 ["\015"] = "\226\144\143", ["\016"] = "\226\144\144", ["\017"] = "\226\144\145",
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31 ["\018"] = "\226\144\146", ["\019"] = "\226\144\147", ["\020"] = "\226\144\148",
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32 ["\021"] = "\226\144\149", ["\022"] = "\226\144\150", ["\023"] = "\226\144\151",
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33 ["\024"] = "\226\144\152", ["\025"] = "\226\144\153", ["\026"] = "\226\144\154",
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34 ["\027"] = "\226\144\155", ["\028"] = "\226\144\156", ["\029"] = "\226\144\157",
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35 ["\030"] = "\226\144\158", ["\031"] = "\226\144\159", ["\127"] = "\226\144\161",
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36 };
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37 local supports_p = pcall(string.format, "%p", ""); -- >= Lua 5.4
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38 local supports_a = pcall(string.format, "%a", 0.0); -- > Lua 5.1
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39
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40 local function format(formatstring, ...)
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41 local args = pack(...);
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42 local args_length = args.n;
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43
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44 -- format specifier spec:
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45 -- 1. Start: '%%'
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46 -- 2. Flags: '[%-%+ #0]'
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47 -- 3. Width: '%d?%d?'
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48 -- 4. Precision: '%.?%d?%d?'
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49 -- 5. Option: '[cdiouxXaAeEfgGqs%%]'
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50 --
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51 -- The options c, d, E, e, f, g, G, i, o, u, X, and x all expect a number as argument, whereas q and s expect a string.
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52 -- This function does not accept string values containing embedded zeros, except as arguments to the q option.
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53 -- a and A are only in Lua 5.2+
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54 -- Lua 5.4 adds a p format that produces a pointer
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56
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57 -- process each format specifier
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58 local i = 0;
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59 formatstring = formatstring:gsub("%%[^cdiouxXaAeEfgGpqs%%]*[cdiouxXaAeEfgGpqs%%]", function(spec)
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60 if spec == "%%" then return end
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61 i = i + 1;
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62 local arg = args[i];
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63
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64 if arg == nil then
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65 args[i] = "nil";
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66 return "(%s)";
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67 end
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68
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69 local option = spec:sub(-1);
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70 local t = type(arg);
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71
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72 if option == "s" and t == "string" and not arg:find("[%z\1-\31\128-\255]") then
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73 -- No UTF-8 or control characters, assumed to be the common case.
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74 return
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75 elseif t == "number" then
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76 if option == "g" or (option == "d" and num_type(arg) == "integer") then return end
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77 elseif option == "s" and t ~= "string" then
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78 arg = tostring(arg);
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79 t = "string";
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80 end
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81
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82 if option ~= "s" and option ~= "q" and option ~= "p" then
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83 -- all other options expect numbers
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84 if t ~= "number" then
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85 -- arg isn't number as expected?
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86 arg = tostring(arg);
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87 option = "s";
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88 spec = "[%s]";
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89 t = "string";
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90 elseif expects_integer[option] and num_type(arg) ~= "integer" then
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91 args[i] = tostring(arg);
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92 return "[%s]";
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93 elseif expects_positive[option] and arg < 0 then
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94 args[i] = tostring(arg);
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95 return "[%s]";
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96 elseif (option == "a" or option == "A") and not supports_a then
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97 return "%x";
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98 else
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99 return -- acceptable number
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100 end
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101 end
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102
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103
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104 if option == "p" and not supports_p then
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105 arg = tostring(arg);
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106 option = "s";
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107 spec = "[%s]";
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108 t = "string";
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109 end
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110
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111 if t == "string" and option ~= "p" then
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112 if not valid_utf8(arg) then
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113 option = "q";
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114 elseif option ~= "q" then -- gets fully escaped in the next block
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115 -- Prevent funny things with ASCII control characters and ANSI escape codes (CWE-117)
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116 -- Also ensure embedded newlines can't look like another log line (CWE-93)
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117 args[i] = arg:gsub("[%z\1-\8\11-\31\127]", control_symbols):gsub("\n\t?", "\n\t");
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118 return spec;
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119 end
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120 end
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121
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122 if option == "q" then
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123 args[i] = dump(arg);
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124 return "%s";
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125 end
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126
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127 if option == "p" and (t == "boolean" or t == "number") then
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128 args[i] = tostring(arg);
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129 return "[%s]";
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130 end
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131 end);
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132
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133 -- process extra args
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134 while i < args_length do
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135 i = i + 1;
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136 local arg = args[i];
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137 if arg == nil then
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138 args[i] = "(nil)";
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139 else
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140 args[i] = tostring(arg):gsub("[%z\1-\8\11-\31\127]", control_symbols):gsub("\n\t?", "\n\t");
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141 end
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142 formatstring = formatstring .. " [%s]"
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143 end
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144
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145 return formatstring:format(unpack(args));
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146 end
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147
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148 return {
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149 format = format;
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150 };