prosody
4533c9b906b0
util/format.lua

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util/format.lua @ 12983:4533c9b906b0

util.format: Tweak serialization of %q formatted entries Improves serialization of function references especially, the built-in default handling of that in util.serialization is not the most informative. Now, along with the function metatable from util.startup, the actual function can be found by filename and line number.
author Kim Alvefur <zash@zash.se>
date Sun, 26 Mar 2023 00:18:05 +0100
parent 12975:d10957394a3c
child 12984:f08125a8be34
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 cause 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;
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10 local pack = table.pack;
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11 local valid_utf8 = require "prosody.util.encodings".utf8.valid;
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12 local type = type;
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13 local dump = require"prosody.util.serialization".new({
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14 preset = "compact";
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15 fallback = function(v, why)
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16 return "_[[" .. (why or tostring(v)) .. "]] ";
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17 end;
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18 fatal = false;
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19 maxdepth = 5;
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20 });
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21 local num_type = math.type;
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22
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23 -- In Lua 5.3+ these formats throw an error if given a float
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24 local expects_integer = { c = true, d = true, i = true, o = true, u = true, X = true, x = true, };
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25 -- In Lua 5.2 these throw an error given a negative number
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26 local expects_positive = { o = true; u = true; x = true; X = true };
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27 -- Printable Unicode replacements for control characters
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28 local control_symbols = {
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29 -- 0x00 .. 0x1F --> U+2400 .. U+241F, 0x7F --> U+2421
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30 ["\000"] = "\226\144\128", ["\001"] = "\226\144\129", ["\002"] = "\226\144\130",
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31 ["\003"] = "\226\144\131", ["\004"] = "\226\144\132", ["\005"] = "\226\144\133",
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32 ["\006"] = "\226\144\134", ["\007"] = "\226\144\135", ["\008"] = "\226\144\136",
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33 ["\009"] = "\226\144\137", ["\010"] = "\226\144\138", ["\011"] = "\226\144\139",
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34 ["\012"] = "\226\144\140", ["\013"] = "\226\144\141", ["\014"] = "\226\144\142",
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35 ["\015"] = "\226\144\143", ["\016"] = "\226\144\144", ["\017"] = "\226\144\145",
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36 ["\018"] = "\226\144\146", ["\019"] = "\226\144\147", ["\020"] = "\226\144\148",
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37 ["\021"] = "\226\144\149", ["\022"] = "\226\144\150", ["\023"] = "\226\144\151",
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38 ["\024"] = "\226\144\152", ["\025"] = "\226\144\153", ["\026"] = "\226\144\154",
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39 ["\027"] = "\226\144\155", ["\028"] = "\226\144\156", ["\029"] = "\226\144\157",
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40 ["\030"] = "\226\144\158", ["\031"] = "\226\144\159", ["\127"] = "\226\144\161",
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41 };
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42 local supports_p = pcall(string.format, "%p", ""); -- >= Lua 5.4
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43
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44 local function format(formatstring, ...)
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45 local args = pack(...);
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46 local args_length = args.n;
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47
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48 -- format specifier spec:
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49 -- 1. Start: '%%'
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50 -- 2. Flags: '[%-%+ #0]'
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51 -- 3. Width: '%d?%d?'
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52 -- 4. Precision: '%.?%d?%d?'
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53 -- 5. Option: '[cdiouxXaAeEfgGqs%%]'
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54 --
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55 -- 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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56 -- This function does not accept string values containing embedded zeros, except as arguments to the q option.
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57 -- a and A are only in Lua 5.2+
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58 -- Lua 5.4 adds a p format that produces a pointer
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60
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61 -- process each format specifier
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62 local i = 0;
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63 formatstring = formatstring:gsub("%%[^cdiouxXaAeEfgGpqs%%]*[cdiouxXaAeEfgGpqs%%]", function(spec)
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64 if spec == "%%" then return end
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65 i = i + 1;
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66 local arg = args[i];
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67
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68 if arg == nil then
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69 args[i] = "nil";
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70 return "(%s)";
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71 end
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72
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73 local option = spec:sub(-1);
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74 local t = type(arg);
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75
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76 if option == "s" and t == "string" and not arg:find("[%z\1-\31\128-\255]") then
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77 -- No UTF-8 or control characters, assumed to be the common case.
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78 return
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79 elseif t == "number" then
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80 if option == "g" or (option == "d" and num_type(arg) == "integer") then return end
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81 elseif option == "s" and t ~= "string" then
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82 arg = tostring(arg);
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83 t = "string";
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84 end
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85
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86 if option ~= "s" and option ~= "q" and option ~= "p" then
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87 -- all other options expect numbers
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88 if t ~= "number" then
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89 -- arg isn't number as expected?
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90 arg = tostring(arg);
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91 option = "s";
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92 spec = "[%s]";
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93 t = "string";
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94 elseif expects_integer[option] and num_type(arg) ~= "integer" then
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95 args[i] = tostring(arg);
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96 return "[%s]";
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97 elseif expects_positive[option] and arg < 0 then
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98 args[i] = tostring(arg);
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99 return "[%s]";
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100 else
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101 return -- acceptable number
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102 end
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103 end
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104
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105
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106 if option == "p" and not supports_p then
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107 arg = tostring(arg);
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108 option = "s";
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109 spec = "[%s]";
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110 t = "string";
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111 end
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112
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113 if t == "string" and option ~= "p" then
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114 if not valid_utf8(arg) then
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115 option = "q";
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116 elseif option ~= "q" then -- gets fully escaped in the next block
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117 -- Prevent funny things with ASCII control characters and ANSI escape codes (CWE-117)
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118 -- Also ensure embedded newlines can't look like another log line (CWE-93)
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119 args[i] = arg:gsub("[%z\1-\8\11-\31\127]", control_symbols):gsub("\n\t?", "\n\t");
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120 return spec;
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121 end
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122 end
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123
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124 if option == "q" then
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125 args[i] = dump(arg);
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126 return "%s";
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127 end
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128
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129 if option == "p" and (t == "boolean" or t == "number") then
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130 args[i] = tostring(arg);
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131 return "[%s]";
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132 end
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133 end);
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134
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135 -- process extra args
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136 while i < args_length do
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137 i = i + 1;
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138 local arg = args[i];
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139 if arg == nil then
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140 args[i] = "(nil)";
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141 else
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142 args[i] = tostring(arg):gsub("[%z\1-\8\11-\31\127]", control_symbols):gsub("\n\t?", "\n\t");
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143 end
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144 formatstring = formatstring .. " [%s]"
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145 end
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146
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147 return formatstring:format(unpack(args));
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148 end
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149
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150 return {
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151 format = format;
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152 };