prosody
bb5f772b3189
util/xml.lua

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util/xml.lua @ 12520:bb5f772b3189 0.12

util.prosodyctl.check: Remove now redundant unbound config tweak This is now done in net.unbound itself Turning it back on in the config may still cause the problem of entries there masking the DNS values.
author Kim Alvefur <zash@zash.se>
date Thu, 26 May 2022 13:03:58 +0200
parent 12270:c78639ee6ccb
child 12975:d10957394a3c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 local st = require "util.stanza";
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3 local lxp = require "lxp";
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4 local t_insert = table.insert;
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5 local t_remove = table.remove;
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6 local error = error;
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7
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8 local _ENV = nil;
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9 -- luacheck: std none
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11 local parse_xml = (function()
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12 local ns_prefixes = {
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13 ["http://www.w3.org/XML/1998/namespace"] = "xml";
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14 };
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15 local ns_separator = "\1";
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16 local ns_pattern = "^([^"..ns_separator.."]*)"..ns_separator.."?(.*)$";
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17 return function(xml, options)
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18 --luacheck: ignore 212/self
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19 local handler = {};
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20 local stanza = st.stanza("root");
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21 local namespaces = {};
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22 local prefixes = {};
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23 function handler:StartNamespaceDecl(prefix, url)
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24 if prefix ~= nil then
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25 t_insert(namespaces, url);
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26 t_insert(prefixes, prefix);
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27 end
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28 end
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29 function handler:EndNamespaceDecl(prefix)
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30 if prefix ~= nil then
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31 -- we depend on each StartNamespaceDecl having a paired EndNamespaceDecl
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32 t_remove(namespaces);
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33 t_remove(prefixes);
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34 end
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35 end
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36 function handler:StartElement(tagname, attr)
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37 local curr_ns,name = tagname:match(ns_pattern);
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38 if name == "" then
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39 curr_ns, name = "", curr_ns;
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40 end
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41 if curr_ns ~= "" then
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42 attr.xmlns = curr_ns;
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43 end
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44 for i=1,#attr do
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45 local k = attr[i];
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46 attr[i] = nil;
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47 local ns, nm = k:match(ns_pattern);
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48 if nm ~= "" then
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49 ns = ns_prefixes[ns];
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50 if ns then
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51 attr[ns..":"..nm] = attr[k];
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52 attr[k] = nil;
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53 end
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54 end
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55 end
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56 local n = {}
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57 for i=1,#namespaces do
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58 n[prefixes[i]] = namespaces[i];
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59 end
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60 stanza:tag(name, attr, n);
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61 end
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62 function handler:CharacterData(data)
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63 stanza:text(data);
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64 end
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65 function handler:EndElement()
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66 stanza:up();
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67 end
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68 -- SECURITY: These two handlers, especially the Doctype one, are required to prevent exploits such as Billion Laughs.
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69 local function restricted_handler(parser)
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70 if not parser.stop or not parser:stop() then
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71 error("Failed to abort parsing");
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72 end
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73 end
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74 handler.StartDoctypeDecl = restricted_handler;
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75 if not options or not options.allow_comments then
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76 -- NOTE: comments are generally harmless and can be useful when parsing configuration files or other data, even user-provided data
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77 handler.Comment = restricted_handler;
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78 end
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79 if not options or not options.allow_processing_instructions then
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80 -- Processing instructions should generally be safe to just ignore
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81 handler.ProcessingInstruction = restricted_handler;
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82 end
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83 local parser = lxp.new(handler, ns_separator);
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84 local ok, err, line, col = parser:parse(xml);
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85 if ok then ok, err, line, col = parser:parse(); end
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86 --parser:close();
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87 if ok then
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88 return stanza.tags[1];
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89 else
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90 return ok, ("%s (line %d, col %d))"):format(err, line, col);
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91 end
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92 end;
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93 end)();
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94
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95 return {
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96 parse = parse_xml;
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97 };