File

spec/util_dataforms_spec.lua @ 12181:783056b4e448 0.11 0.11.12

util.xml: Do not allow doctypes, comments or processing instructions Yes. This is as bad as it sounds. CVE pending. In Prosody itself, this only affects mod_websocket, which uses util.xml to parse the <open/> frame, thus allowing unauthenticated remote DoS using Billion Laughs. However, third-party modules using util.xml may also be affected by this. This commit installs handlers which disallow the use of doctype declarations and processing instructions without any escape hatch. It, by default, also introduces such a handler for comments, however, there is a way to enable comments nontheless. This is because util.xml is used to parse human-facing data, where comments are generally a desirable feature, and also because comments are generally harmless.
author Jonas Schäfer <jonas@wielicki.name>
date Mon, 10 Jan 2022 18:23:54 +0100
parent 9243:a4c52e304e6f
child 10512:3089086d31fa
line wrap: on
line source

local dataforms = require "util.dataforms";
local st = require "util.stanza";
local jid = require "util.jid";
local iter = require "util.iterators";

describe("util.dataforms", function ()
	local some_form, xform;
	setup(function ()
		some_form = dataforms.new({
			title = "form-title",
			instructions = "form-instructions",
			{
				type = "hidden",
				name = "FORM_TYPE",
				value = "xmpp:prosody.im/spec/util.dataforms#1",
			};
			{
				type = "fixed";
				value = "Fixed field";
			},
			{
				type = "boolean",
				label = "boolean-label",
				name = "boolean-field",
				value = true,
			},
			{
				type = "fixed",
				label = "fixed-label",
				name = "fixed-field",
				value = "fixed-value",
			},
			{
				type = "hidden",
				label = "hidden-label",
				name = "hidden-field",
				value = "hidden-value",
			},
			{
				type = "jid-multi",
				label = "jid-multi-label",
				name = "jid-multi-field",
				value = {
					"jid@multi/value#1",
					"jid@multi/value#2",
				},
			},
			{
				type = "jid-single",
				label = "jid-single-label",
				name = "jid-single-field",
				value = "jid@single/value",
			},
			{
				type = "list-multi",
				label = "list-multi-label",
				name = "list-multi-field",
				value = {
					"list-multi-option-value#1",
					"list-multi-option-value#3",
				},
				options = {
					{
						label = "list-multi-option-label#1",
						value = "list-multi-option-value#1",
						default = true,
					},
					{
						label = "list-multi-option-label#2",
						value = "list-multi-option-value#2",
						default = false,
					},
					{
						label = "list-multi-option-label#3",
						value = "list-multi-option-value#3",
						default = true,
					},
				}
			},
			{
				type = "list-single",
				label = "list-single-label",
				name = "list-single-field",
				value = "list-single-value",
				options = {
					"list-single-value",
					"list-single-value#2",
					"list-single-value#3",
				}
			},
			{
				type = "text-multi",
				label = "text-multi-label",
				name = "text-multi-field",
				value = "text\nmulti\nvalue",
			},
			{
				type = "text-private",
				label = "text-private-label",
				name = "text-private-field",
				value = "text-private-value",
			},
			{
				type = "text-single",
				label = "text-single-label",
				name = "text-single-field",
				value = "text-single-value",
			},
		});
		xform = some_form:form();
	end);

	it("works", function ()
		assert.truthy(xform);
		assert.truthy(st.is_stanza(xform));
		assert.equal("x", xform.name);
		assert.equal("jabber:x:data", xform.attr.xmlns);
		assert.equal("FORM_TYPE", xform:find("field@var"));
		assert.equal("xmpp:prosody.im/spec/util.dataforms#1", xform:find("field/value#"));
		local allowed_direct_children = {
			title = true,
			instructions = true,
			field = true,
		}
		for tag in xform:childtags() do
			assert.truthy(allowed_direct_children[tag.name], "unknown direct child");
		end
	end);

	it("produced boolean field correctly", function ()
		local f;
		for field in xform:childtags("field") do
			if field.attr.var == "boolean-field" then
				f = field;
				break;
			end
		end

		assert.truthy(st.is_stanza(f));
		assert.equal("boolean-field", f.attr.var);
		assert.equal("boolean", f.attr.type);
		assert.equal("boolean-label", f.attr.label);
		assert.equal(1, iter.count(f:childtags("value")));
		local val = f:get_child_text("value");
		assert.truthy(val == "true" or val == "1");
	end);

	it("produced fixed field correctly", function ()
		local f;
		for field in xform:childtags("field") do
			if field.attr.var == "fixed-field" then
				f = field;
				break;
			end
		end

		assert.truthy(st.is_stanza(f));
		assert.equal("fixed-field", f.attr.var);
		assert.equal("fixed", f.attr.type);
		assert.equal("fixed-label", f.attr.label);
		assert.equal(1, iter.count(f:childtags("value")));
		assert.equal("fixed-value", f:get_child_text("value"));
	end);

	it("produced hidden field correctly", function ()
		local f;
		for field in xform:childtags("field") do
			if field.attr.var == "hidden-field" then
				f = field;
				break;
			end
		end

		assert.truthy(st.is_stanza(f));
		assert.equal("hidden-field", f.attr.var);
		assert.equal("hidden", f.attr.type);
		assert.equal("hidden-label", f.attr.label);
		assert.equal(1, iter.count(f:childtags("value")));
		assert.equal("hidden-value", f:get_child_text("value"));
	end);

	it("produced jid-multi field correctly", function ()
		local f;
		for field in xform:childtags("field") do
			if field.attr.var == "jid-multi-field" then
				f = field;
				break;
			end
		end

		assert.truthy(st.is_stanza(f));
		assert.equal("jid-multi-field", f.attr.var);
		assert.equal("jid-multi", f.attr.type);
		assert.equal("jid-multi-label", f.attr.label);
		assert.equal(2, iter.count(f:childtags("value")));

		local i = 0;
		for value in f:childtags("value") do
			i = i + 1;
			assert.equal(("jid@multi/value#%d"):format(i), value:get_text());
		end
	end);

	it("produced jid-single field correctly", function ()
		local f;
		for field in xform:childtags("field") do
			if field.attr.var == "jid-single-field" then
				f = field;
				break;
			end
		end

		assert.truthy(st.is_stanza(f));
		assert.equal("jid-single-field", f.attr.var);
		assert.equal("jid-single", f.attr.type);
		assert.equal("jid-single-label", f.attr.label);
		assert.equal(1, iter.count(f:childtags("value")));
		assert.equal("jid@single/value", f:get_child_text("value"));
		assert.truthy(jid.prep(f:get_child_text("value")));
	end);

	it("produced list-multi field correctly", function ()
		local f;
		for field in xform:childtags("field") do
			if field.attr.var == "list-multi-field" then
				f = field;
				break;
			end
		end

		assert.truthy(st.is_stanza(f));
		assert.equal("list-multi-field", f.attr.var);
		assert.equal("list-multi", f.attr.type);
		assert.equal("list-multi-label", f.attr.label);
		assert.equal(2, iter.count(f:childtags("value")));
		assert.equal("list-multi-option-value#1", f:get_child_text("value"));
		assert.equal(3, iter.count(f:childtags("option")));
	end);

	it("produced list-single field correctly", function ()
		local f;
		for field in xform:childtags("field") do
			if field.attr.var == "list-single-field" then
				f = field;
				break;
			end
		end

		assert.truthy(st.is_stanza(f));
		assert.equal("list-single-field", f.attr.var);
		assert.equal("list-single", f.attr.type);
		assert.equal("list-single-label", f.attr.label);
		assert.equal(1, iter.count(f:childtags("value")));
		assert.equal("list-single-value", f:get_child_text("value"));
		assert.equal(3, iter.count(f:childtags("option")));
	end);

	it("produced text-multi field correctly", function ()
		local f;
		for field in xform:childtags("field") do
			if field.attr.var == "text-multi-field" then
				f = field;
				break;
			end
		end

		assert.truthy(st.is_stanza(f));
		assert.equal("text-multi-field", f.attr.var);
		assert.equal("text-multi", f.attr.type);
		assert.equal("text-multi-label", f.attr.label);
		assert.equal(3, iter.count(f:childtags("value")));
	end);

	it("produced text-private field correctly", function ()
		local f;
		for field in xform:childtags("field") do
			if field.attr.var == "text-private-field" then
				f = field;
				break;
			end
		end

		assert.truthy(st.is_stanza(f));
		assert.equal("text-private-field", f.attr.var);
		assert.equal("text-private", f.attr.type);
		assert.equal("text-private-label", f.attr.label);
		assert.equal(1, iter.count(f:childtags("value")));
		assert.equal("text-private-value", f:get_child_text("value"));
	end);

	it("produced text-single field correctly", function ()
		local f;
		for field in xform:childtags("field") do
			if field.attr.var == "text-single-field" then
				f = field;
				break;
			end
		end

		assert.truthy(st.is_stanza(f));
		assert.equal("text-single-field", f.attr.var);
		assert.equal("text-single", f.attr.type);
		assert.equal("text-single-label", f.attr.label);
		assert.equal(1, iter.count(f:childtags("value")));
		assert.equal("text-single-value", f:get_child_text("value"));
	end);

	describe("get_type()", function ()
		it("identifes dataforms", function ()
			assert.equal(nil, dataforms.get_type(nil));
			assert.equal(nil, dataforms.get_type(""));
			assert.equal(nil, dataforms.get_type({}));
			assert.equal(nil, dataforms.get_type(st.stanza("no-a-form")));
			assert.equal("xmpp:prosody.im/spec/util.dataforms#1", dataforms.get_type(xform));
		end);
	end);

	describe(":data", function ()
		it("works", function ()
			assert.truthy(some_form:data(xform));
		end);
	end);

	describe("issue1177", function ()
		local form_with_stuff;
		setup(function ()
			form_with_stuff = dataforms.new({
				{
					type = "list-single";
					name = "abtest";
					label = "A or B?";
					options = {
						{ label = "A", value = "a", default = true },
						{ label = "B", value = "b" },
					};
				},
			});
		end);

		it("includes options when value is included", function ()
			local f = form_with_stuff:form({ abtest = "a" });
			assert.truthy(f:find("field/option"));
		end);

		it("includes options when value is excluded", function ()
			local f = form_with_stuff:form({});
			assert.truthy(f:find("field/option"));
		end);
	end);

	describe("using current values in place of missing fields", function ()
		it("gets back the previous values when given an empty form", function ()
			local current = {
				["list-multi-field"] = {
					"list-multi-option-value#2";
				};
				["list-single-field"] = "list-single-value#2";
				["hidden-field"] = "hidden-value";
				["boolean-field"] = false;
				["text-multi-field"] = "words\ngo\nhere";
				["jid-single-field"] = "alice@example.com";
				["text-private-field"] = "hunter2";
				["text-single-field"] = "text-single-value";
				["jid-multi-field"] = {
					"bob@example.net";
				};
			};
			local expect = {
				-- FORM_TYPE = "xmpp:prosody.im/spec/util.dataforms#1"; -- does this need to be included?
				["list-multi-field"] = {
					"list-multi-option-value#2";
				};
				["list-single-field"] = "list-single-value#2";
				["hidden-field"] = "hidden-value";
				["boolean-field"] = false;
				["text-multi-field"] = "words\ngo\nhere";
				["jid-single-field"] = "alice@example.com";
				["text-private-field"] = "hunter2";
				["text-single-field"] = "text-single-value";
				["jid-multi-field"] = {
					"bob@example.net";
				};
			};
			local data, err = some_form:data(st.stanza("x", {xmlns="jabber:x:data"}), current);
			assert.is.table(data, err);
			assert.same(expect, data, "got back the same data");
		end);
	end);

	describe("field 'var' property", function ()
		it("works as expected", function ()
			local f = dataforms.new {
				{
					var = "someprefix#the-field",
					name = "the_field",
					type = "text-single",
				}
			};
			local x = f:form({the_field = "hello"});
			assert.equal("someprefix#the-field", x:find"field@var");
			assert.equal("hello", x:find"field/value#");
		end);
	end);

	describe("validation", function ()
		local f = dataforms.new {
			{
				name = "number",
				type = "text-single",
				datatype = "xs:integer",
			},
		};

		it("works", function ()
			local d = f:data(f:form({number = 1}));
			assert.equal(1, d.number);
		end);

		it("works", function ()
			local d,e = f:data(f:form({number = "nan"}));
			assert.not_equal(1, d.number);
			assert.table(e);
			assert.string(e.number);
		end);
	end);
end);