1 | dojo.provide("dojox.secure.DOM"); |
---|
2 | dojo.require("dojox.lang.observable"); |
---|
3 | |
---|
4 | dojox.secure.DOM = function(element){ |
---|
5 | function safeNode(node){ |
---|
6 | if(!node){ |
---|
7 | return node; |
---|
8 | } |
---|
9 | var parent = node; |
---|
10 | do { |
---|
11 | if(parent == element){ |
---|
12 | return wrap(node); |
---|
13 | } |
---|
14 | } while((parent = parent.parentNode)); |
---|
15 | return null; |
---|
16 | } |
---|
17 | function wrap(result){ |
---|
18 | if(result){ |
---|
19 | if(result.nodeType){ |
---|
20 | // wrap the node |
---|
21 | var wrapped = nodeObserver(result); |
---|
22 | if(result.nodeType == 1 && typeof wrapped.style == 'function'){ // if it is a function, that means it is holding a slot for us, now we will override it |
---|
23 | wrapped.style = styleObserver(result.style); |
---|
24 | wrapped.ownerDocument = safeDoc; |
---|
25 | wrapped.childNodes = {__get__:function(i){ |
---|
26 | return wrap(result.childNodes[i]); |
---|
27 | }, |
---|
28 | length:0 |
---|
29 | }; |
---|
30 | //TODO: maybe add attributes |
---|
31 | } |
---|
32 | return wrapped; |
---|
33 | } |
---|
34 | if(result && typeof result == 'object'){ |
---|
35 | if(result.__observable){ |
---|
36 | // we have already wrapped it, this helps prevent circular/infinite loops |
---|
37 | return result.__observable; |
---|
38 | } |
---|
39 | // wrap the node list |
---|
40 | wrapped = result instanceof Array ? [] : {}; |
---|
41 | result.__observable = wrapped; |
---|
42 | for(var i in result){ |
---|
43 | if (i != '__observable'){ |
---|
44 | wrapped[i] = wrap(result[i]); |
---|
45 | } |
---|
46 | } |
---|
47 | wrapped.data__ = result; |
---|
48 | |
---|
49 | return wrapped; |
---|
50 | } |
---|
51 | if(typeof result == 'function'){ |
---|
52 | var unwrap = function(result){ |
---|
53 | if(typeof result == 'function'){ |
---|
54 | // if untrusted code passes a function to trusted code, we want the trusted code to be |
---|
55 | // able to execute it and have the arguments automatically wrapped |
---|
56 | return function(){ |
---|
57 | for (var i = 0; i < arguments.length; i++){ |
---|
58 | arguments[i] = wrap(arguments[i]); |
---|
59 | } |
---|
60 | return unwrap(result.apply(wrap(this),arguments)); |
---|
61 | } |
---|
62 | } |
---|
63 | return dojox.secure.unwrap(result); |
---|
64 | }; |
---|
65 | // when we wrap a function we make it so that we can untrusted code can execute |
---|
66 | // the function and the arguments will be unwrapped for the trusted code |
---|
67 | return function(){ |
---|
68 | if(result.safetyCheck){ |
---|
69 | result.safetyCheck.apply(unwrap(this),arguments); |
---|
70 | } |
---|
71 | for (var i = 0; i < arguments.length; i++){ |
---|
72 | arguments[i] = unwrap(arguments[i]); |
---|
73 | } |
---|
74 | return wrap(result.apply(unwrap(this),arguments)); |
---|
75 | } |
---|
76 | } |
---|
77 | } |
---|
78 | return result; |
---|
79 | } |
---|
80 | unwrap = dojox.secure.unwrap; |
---|
81 | |
---|
82 | function safeCSS(css){ |
---|
83 | css += ''; // make sure it is a string |
---|
84 | if(css.match(/behavior:|content:|javascript:|binding|expression|\@import/)){ |
---|
85 | throw new Error("Illegal CSS"); |
---|
86 | } |
---|
87 | var id = element.id || (element.id = "safe" + ('' + Math.random()).substring(2)); |
---|
88 | return css.replace(/(\}|^)\s*([^\{]*\{)/g,function(t,a,b){ // put all the styles in the context of the id of the sandbox |
---|
89 | return a + ' #' + id + ' ' + b; // need to remove body and html references something like: .replace(/body/g,''); but that would break mybody... |
---|
90 | }); |
---|
91 | } |
---|
92 | function safeURL(url){ |
---|
93 | // test a url to see if it is safe |
---|
94 | if(url.match(/:/) && !url.match(/^(http|ftp|mailto)/)){ |
---|
95 | throw new Error("Unsafe URL " + url); |
---|
96 | } |
---|
97 | } |
---|
98 | function safeElement(el){ |
---|
99 | // test an element to see if it is safe |
---|
100 | if(el && el.nodeType == 1){ |
---|
101 | if(el.tagName.match(/script/i)){ |
---|
102 | var src = el.src; |
---|
103 | if (src && src != ""){ |
---|
104 | // load the src and evaluate it safely |
---|
105 | el.parentNode.removeChild(el); |
---|
106 | dojo.xhrGet({url:src,secure:true}).addCallback(function(result){ |
---|
107 | safeDoc.evaluate(result); |
---|
108 | }); |
---|
109 | } |
---|
110 | else{ |
---|
111 | //evaluate the script safely and remove it |
---|
112 | var script = el.innerHTML; |
---|
113 | el.parentNode.removeChild(el); |
---|
114 | wrap.evaluate(script); |
---|
115 | } |
---|
116 | } |
---|
117 | if(el.tagName.match(/link/i)){ |
---|
118 | throw new Error("illegal tag"); |
---|
119 | } |
---|
120 | if(el.tagName.match(/style/i)){ |
---|
121 | var setCSS = function(cssStr){ |
---|
122 | if(el.styleSheet){// IE |
---|
123 | el.styleSheet.cssText = cssStr; |
---|
124 | } else {// w3c |
---|
125 | var cssText = doc.createTextNode(cssStr); |
---|
126 | if (el.childNodes[0]) |
---|
127 | el.replaceChild(cssText,el.childNodes[0]) |
---|
128 | else |
---|
129 | el.appendChild(cssText); |
---|
130 | } |
---|
131 | |
---|
132 | } |
---|
133 | src = el.src; |
---|
134 | if(src && src != ""){ |
---|
135 | alert('src' + src); |
---|
136 | // try to load it by url and safely load it |
---|
137 | el.src = null; |
---|
138 | dojo.xhrGet({url:src,secure:true}).addCallback(function(result){ |
---|
139 | setCSS(safeCSS(result)); |
---|
140 | }); |
---|
141 | } |
---|
142 | setCSS(safeCSS(el.innerHTML)); |
---|
143 | } |
---|
144 | if(el.style){ |
---|
145 | safeCSS(el.style.cssText); |
---|
146 | } |
---|
147 | if(el.href){ |
---|
148 | safeURL(el.href); |
---|
149 | } |
---|
150 | if(el.src){ |
---|
151 | safeURL(el.src); |
---|
152 | } |
---|
153 | var attr,i = 0; |
---|
154 | while ((attr=el.attributes[i++])){ |
---|
155 | if(attr.name.substring(0,2)== "on" && attr.value != "null" && attr.value != ""){ // must remove all the event handlers |
---|
156 | throw new Error("event handlers not allowed in the HTML, they must be set with element.addEventListener"); |
---|
157 | } |
---|
158 | } |
---|
159 | var children = el.childNodes; |
---|
160 | for (var i =0, l = children.length; i < l; i++){ |
---|
161 | safeElement(children[i]); |
---|
162 | } |
---|
163 | } |
---|
164 | } |
---|
165 | function safeHTML(html){ |
---|
166 | var div = document.createElement("div"); |
---|
167 | if(html.match(/<object/i)) |
---|
168 | throw new Error("The object tag is not allowed"); |
---|
169 | div.innerHTML = html; // this is safe with an unattached node |
---|
170 | safeElement(div); |
---|
171 | return div; |
---|
172 | } |
---|
173 | var doc = element.ownerDocument; |
---|
174 | var safeDoc = { |
---|
175 | getElementById : function(id){ |
---|
176 | return safeNode(doc.getElementById(id)); |
---|
177 | }, |
---|
178 | createElement : function(name){ |
---|
179 | return wrap(doc.createElement(name)); |
---|
180 | }, |
---|
181 | createTextNode : function(name){ |
---|
182 | return wrap(doc.createTextNode(name)); |
---|
183 | }, |
---|
184 | write : function(str){ |
---|
185 | var div = safeHTML(str); |
---|
186 | while (div.childNodes.length){ |
---|
187 | // move all these children to the main node |
---|
188 | element.appendChild(div.childNodes[0]); |
---|
189 | } |
---|
190 | } |
---|
191 | }; |
---|
192 | safeDoc.open = safeDoc.close = function(){}; // no-op functions |
---|
193 | var setters = { |
---|
194 | innerHTML : function(node,value){ |
---|
195 | console.log('setting innerHTML'); |
---|
196 | node.innerHTML = safeHTML(value).innerHTML; |
---|
197 | } |
---|
198 | }; |
---|
199 | setters.outerHTML = function(node,value){ |
---|
200 | throw new Error("Can not set this property"); |
---|
201 | }; // blocked |
---|
202 | function domChanger(name,newNodeArg){ |
---|
203 | return function(node,args){ |
---|
204 | safeElement(args[newNodeArg]); // check to make sure the new node is safe |
---|
205 | return node[name](args[0]);// execute the method |
---|
206 | }; |
---|
207 | } |
---|
208 | var invokers = { |
---|
209 | appendChild : domChanger("appendChild",0), |
---|
210 | insertBefore : domChanger("insertBefore",0), |
---|
211 | replaceChild : domChanger("replaceChild",1), |
---|
212 | cloneNode : function(node,args){ |
---|
213 | return node.cloneNode(args[0]); |
---|
214 | }, |
---|
215 | addEventListener : function(node,args){ |
---|
216 | dojo.connect(node,'on' + args[0],this,function(event){ |
---|
217 | event = nodeObserver(event || window.event); |
---|
218 | args[1].call(this,event); |
---|
219 | }); |
---|
220 | } |
---|
221 | }; |
---|
222 | invokers.childNodes = invokers.style = invokers.ownerDocument = function(){}; // this is a trick to get these property slots available, they will be overridden |
---|
223 | function makeObserver(setter){ // we make two of these, but the setter for style nodes is different |
---|
224 | return dojox.lang.makeObservable( |
---|
225 | function(node, prop){ |
---|
226 | var result; |
---|
227 | return node[prop]; |
---|
228 | },setter, |
---|
229 | function(wrapper, node, methodName, args){ |
---|
230 | for (var i = 0; i < args.length; i++){ |
---|
231 | args[i] = unwrap(args[i]); |
---|
232 | } |
---|
233 | if(invokers[methodName]){ |
---|
234 | return wrap(invokers[methodName].call(wrapper,node,args)); |
---|
235 | } |
---|
236 | return wrap(node[methodName].apply(node,args)); |
---|
237 | },invokers); |
---|
238 | } |
---|
239 | var nodeObserver = makeObserver(function(node, prop, value){ |
---|
240 | if(setters[prop]){ |
---|
241 | setters[prop](node,value); |
---|
242 | } |
---|
243 | node[prop] = value; |
---|
244 | }); |
---|
245 | var blockedStyles = {behavior:1,MozBinding:1}; |
---|
246 | var styleObserver = makeObserver(function(node, prop, value){ |
---|
247 | if(!blockedStyles[prop]){ |
---|
248 | node[prop] = safeCSS(value); |
---|
249 | } |
---|
250 | }); |
---|
251 | wrap.safeHTML = safeHTML; |
---|
252 | wrap.safeCSS = safeCSS; |
---|
253 | return wrap; |
---|
254 | }; |
---|
255 | dojox.secure.unwrap = function unwrap(result){ |
---|
256 | return (result && result.data__) || result; |
---|
257 | }; |
---|