Check security hash before accepting downloaded files.
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.
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2 changed files with 47 additions and 39 deletions
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cachep2p.min.js
vendored
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cachep2p.min.js
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index.js
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index.js
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@ -129,8 +129,15 @@ function CacheP2P(opts, callback){
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// debug(b)
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// debug(b.toString('utf8'))
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var got_page = JSON.parse(b.toString('utf8'))
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// self.emit('message', "Got cached version of "+got_page.url+" from web peer, modifying link to point to cache.")
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// self.emit('message', "Got cached version of "+got_page.url+" from web peer, checking security hash.")
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sha(got_page.page, function (page_hash) {
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if (page_hash != self.security_sha1[got_page.url]) {
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self.emit('message', 'Cached version of ' + got_page.url + ' has wrong security hash. This is possibly malicious content! Ignoring the version obtained.');
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return;
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}
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self.emit('message', 'Cached version of ' + got_page.url + ' has a verified security hash! Proceeding by changing links in page.');
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cached_link_lists[got_page.url] = got_page
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self.update_links()
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@ -157,6 +164,7 @@ function CacheP2P(opts, callback){
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}
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}
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}
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});
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})
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})
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}
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