63 stanza:text(data); |
63 stanza:text(data); |
64 end |
64 end |
65 function handler:EndElement() |
65 function handler:EndElement() |
66 stanza:up(); |
66 stanza:up(); |
67 end |
67 end |
68 local parser; |
|
69 -- SECURITY: These two handlers, especially the Doctype one, are required to prevent exploits such as Billion Laughs. |
68 -- SECURITY: These two handlers, especially the Doctype one, are required to prevent exploits such as Billion Laughs. |
70 function handler:StartDoctypeDecl() |
69 local function restricted_handler(parser) |
71 if not parser.stop or not parser:stop() then |
70 if not parser.stop or not parser:stop() then |
72 error("Failed to abort parsing"); |
71 error("Failed to abort parsing"); |
73 end |
72 end |
74 end |
73 end |
75 function handler:ProcessingInstruction() |
74 handler.StartDoctypeDecl = restricted_handler; |
76 if not parser.stop or not parser:stop() then |
75 handler.ProcessingInstruction = restricted_handler; |
77 error("Failed to abort parsing"); |
|
78 end |
|
79 end |
|
80 if not options or not options.allow_comments then |
76 if not options or not options.allow_comments then |
81 -- NOTE: comments are generally harmless and can be useful when parsing configuration files or other data, even user-provided data |
77 -- NOTE: comments are generally harmless and can be useful when parsing configuration files or other data, even user-provided data |
82 function handler:Comment() |
78 handler.Comment = restricted_handler; |
83 if not parser.stop or not parser:stop() then |
|
84 error("Failed to abort parsing"); |
|
85 end |
|
86 end |
|
87 end |
79 end |
88 parser = lxp.new(handler, ns_separator); |
80 local parser = lxp.new(handler, ns_separator); |
89 local ok, err, line, col = parser:parse(xml); |
81 local ok, err, line, col = parser:parse(xml); |
90 if ok then ok, err, line, col = parser:parse(); end |
82 if ok then ok, err, line, col = parser:parse(); end |
91 --parser:close(); |
83 --parser:close(); |
92 if ok then |
84 if ok then |
93 return stanza.tags[1]; |
85 return stanza.tags[1]; |