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Check security hash before accepting downloaded files.

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Fixes #7 in the simplest possible way. The current code will
ignore any files with a different security hash from the one
given by the developer. When ignoring, it emits a message
warning of a potentially malicious content. It will also always
emit a message when a downloaded file passes the security hash
check.
This commit is contained in:
Bernardo Vecchia Stein 2016-10-22 03:01:07 -02:00
parent 2e7694b89d
commit daee3bf493
2 changed files with 47 additions and 39 deletions
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2
cachep2p.min.js vendored
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File diff suppressed because one or more lines are too long

84
index.js
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@ -17,10 +17,10 @@ var history_initialized = false
inherits(CacheP2P, EventEmitter)
var cached_mark
var cached_mark
function CacheP2P(opts, callback){
var self = this
if(typeof(opts)==='function'){
callback = opts
}
@ -55,7 +55,7 @@ function CacheP2P(opts, callback){
self.emit('alert', "Please tell a friend to open this site's "+page_link.text+" to see it in action.")
added_links.push(page_link.href)
sha(page_link.href, function(result){
var magnet = 'magnet:?xt=urn:btih:'+result+'&dn=Unnamed+Torrent+1476541118022&tr=udp%3A%2F%2Fexodus.desync.com%3A6969&tr=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969&tr=udp%3A%2F%2Ftracker.internetwarriors.net%3A1337&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969&tr=udp%3A%2F%2Ftracker.openbittorrent.com%3A80&tr=wss%3A%2F%2Ftracker.openwebtorrent.com'
torrent = client.add(magnet, onTorrent)
@ -70,26 +70,26 @@ function CacheP2P(opts, callback){
})
})
}
}
}
}
self.scan_links = function(){
self.emit('message', "Pre-fetching uncached links in this page... ")
var this_page_links = document.getElementsByTagName('a')
var this_page_links = document.getElementsByTagName('a')
for(var i = 0; i < this_page_links.length ; i++){
if(this_page_links[i].href && this_page_links[i].href.length !== window.location.href.length && this_page_links[i].href.indexOf(window.location.href+'#') == -1 && this_page_links[i].href.indexOf(document.domain) > -1){
if(!document.security_sha1 || Object.keys(document.security_sha1).indexOf(this_page_links[i].href) > -1){
if(Object.keys(cached_link_lists).indexOf(this_page_links[i].href) === -1){
self.fetch(this_page_links[i])
}
}
}
}
}
self.update_links()
}
self.update_links = function(){
var all_links = document.getElementsByTagName('a')
var all_links = document.getElementsByTagName('a')
Object.keys(cached_link_lists).forEach(function(each_url){
var got_page = cached_link_lists[each_url]
for(var i = 0 ; i < all_links.length ; i++ ){
@ -99,7 +99,7 @@ function CacheP2P(opts, callback){
self.emit('alert', "Security check of content received: "+sha.sync(got_page.page)+"...")
self.emit('success', "Got this site's '" +all_links[i].text+"' in Cache (sha1: "+got_page.page_hash+" ✔)")
self.emit('success', "The main server will not be used when '"+link_to_page.text+"' is clicked.")
link_to_page.onclick = function(event){
event.preventDefault();
if(!history_initialized){
@ -109,18 +109,18 @@ function CacheP2P(opts, callback){
document.title = cached_mark+' '+cached_link_lists[event.target.href].title
// setTimeout(function(){
// window.scrollTo(0, 0);
// }, 10)
self.emit('cache', event)
self.emit('ready')
self.scan_links()
window.history.pushState({page: got_page.page, title: got_page.title},"", got_page.url);
}
}
}
})
}
}
function onTorrent (torrent) {
torrent.files.forEach(function (file) {
@ -129,42 +129,50 @@ function CacheP2P(opts, callback){
// debug(b)
// debug(b.toString('utf8'))
var got_page = JSON.parse(b.toString('utf8'))
// self.emit('message', "Got cached version of "+got_page.url+" from web peer, modifying link to point to cache.")
cached_link_lists[got_page.url] = got_page
self.update_links()
// self.emit('message', "Got cached version of "+got_page.url+" from web peer, checking security hash.")
window.onpopstate = function(to) {
document.documentElement.innerHTML = to.state.page
document.title = cached_mark+" "+to.state.title
window.scrollTo(0, 0);
self.emit('onpopstate', to)
var this_page_links = document.getElementsByTagName('a')
for(var i = 0; i < this_page_links.length ; i++){
if(Object.keys(cached_link_lists).indexOf(this_page_links[i].href) > -1){
this_page_links[i].onclick = function(event){
event.preventDefault();
document.documentElement.innerHTML = cached_link_lists[event.target.href].page
document.title = cached_mark+' '+cached_link_lists[event.target.href].title
window.history.pushState({page: cached_link_lists[event.target.href].page, title: cached_link_lists[event.target.href].title},"", event.target.href);
setTimeout(function(){
window.scrollTo(0, 0);
}, 10)
sha(got_page.page, function (page_hash) {
if (page_hash != self.security_sha1[got_page.url]) {
self.emit('message', 'Cached version of ' + got_page.url + ' has wrong security hash. This is possibly malicious content! Ignoring the version obtained.');
return;
}
self.emit('message', 'Cached version of ' + got_page.url + ' has a verified security hash! Proceeding by changing links in page.');
cached_link_lists[got_page.url] = got_page
self.update_links()
window.onpopstate = function(to) {
document.documentElement.innerHTML = to.state.page
document.title = cached_mark+" "+to.state.title
window.scrollTo(0, 0);
self.emit('onpopstate', to)
var this_page_links = document.getElementsByTagName('a')
for(var i = 0; i < this_page_links.length ; i++){
if(Object.keys(cached_link_lists).indexOf(this_page_links[i].href) > -1){
this_page_links[i].onclick = function(event){
event.preventDefault();
document.documentElement.innerHTML = cached_link_lists[event.target.href].page
document.title = cached_mark+' '+cached_link_lists[event.target.href].title
window.history.pushState({page: cached_link_lists[event.target.href].page, title: cached_link_lists[event.target.href].title},"", event.target.href);
setTimeout(function(){
window.scrollTo(0, 0);
}, 10)
}
} else {
self.fetch(this_page_links[i])
}
} else {
self.fetch(this_page_links[i])
}
}
}
});
})
})
}
setTimeout(function(){
self.emit('message', "Initializing CacheP2P")
self.scan_links()
var message = {