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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

10
index.js
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@ -129,8 +129,15 @@ function CacheP2P(opts, callback){
// debug(b) // debug(b)
// debug(b.toString('utf8')) // debug(b.toString('utf8'))
var got_page = JSON.parse(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.") // self.emit('message', "Got cached version of "+got_page.url+" from web peer, checking security hash.")
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 cached_link_lists[got_page.url] = got_page
self.update_links() self.update_links()
@ -157,6 +164,7 @@ function CacheP2P(opts, callback){
} }
} }
} }
});
}) })
}) })
} }