140073 2015-01-04 21:01:34 -0800 [GTK] Add API for web process filesystem sandbox extensions 2016-09-21 05:26:44 -0700 1 1 1 Unclassified WebKit WebKitGTK 528+ (Nightly build) PC Linux RESOLVED WONTFIX P2 Normal --- 140072 1 mcatanzaro mcatanzaro cgarcia janousek.jiri mcatanzaro tmpsantos oldest_to_newest 1058651 0 mcatanzaro 2015-01-04 21:01:34 -0800 We unfortunately have to break existing web extensions that perform filesystem operations if we want to sandbox the web process. We have a couple of options here: 1) Require the web extension to set up some form of IPC with the UI process to ask it to perform the syscall for it. This would be inconvenient for web extension authors, and it would be a hole in the sandbox: the UI process should not trust input from the sandbox web process. 2) Provide API to open holes in the sandbox, so the web process can open extra files as needed. E.g. ~/.config/epiphany/adblock Consider also that the API I add in this patch is on the WebKitWebContext. That's probably *not acceptable* if extensions are expected to be developed separately from web browsers, which I think we probably want to support. So this is just a proof of concept; probably the final API should be on the WebKitWebExtension itself. Lastly consider that a better sandbox would trap or block many more syscalls than we currently do. In particular, it'd be really nice to block the web process from accessing the network (if the network process is enabled) (but I think web sockets are currently implemented in the web process only). That would require more sophisticated API beyond that added in this patch, so that the web process would be allowed to e.g. connect to https://easylist-downloads.adblockplus.org/ -- though I definitely want any API we provide to be at a much higher level than system calls. 1058654 1 243962 mcatanzaro 2015-01-04 21:07:04 -0800 Created attachment 243962 Patch 1059808 2 mcatanzaro 2015-01-08 07:08:16 -0800 Another acceptable resolution for this bug, so long as we keep the sandbox relatively lenient (so that it only blocks suspect filesystem accesses), would be to define a directory (e.g. XDG_DATA_DIR/webkitgtk/web-extensions) that will be whitelisted for use by web extensions, and not add any new API. That would likely be preferable. 243962 2015-01-04 21:07:04 -0800 2015-01-04 21:07:04 -0800 Patch 0011-GTK-Add-API-for-web-process-filesystem-sandbox-exten.patch text/plain 40685 mcatanzaro RnJvbSA3N2NiNjc2ZjI4MWE0MWM5YzRlNzg3ZjZhYzkzZDFmZWEzMzIxMjQyIE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBNaWNoYWVsIENhdGFuemFybyA8bWNhdGFuemFyb0BpZ2FsaWEu Y29tPgpEYXRlOiBTdW4sIDQgSmFuIDIwMTUgMjM6MDU6MjQgLTA2MDAKU3ViamVjdDogW1BBVENI XSBbR1RLXSBBZGQgQVBJIGZvciB3ZWIgcHJvY2VzcyBmaWxlc3lzdGVtIHNhbmRib3ggZXh0ZW5z aW9ucwoKVGhpcyBtYWtlcyBpdCBwb3NzaWJsZSBmb3IgYSB3ZWIgZXh0ZW5zaW9uIHRvIGhhdmUg bGltaXRlZCBhY2Nlc3MgdG8gdGhlCmZpbGVzeXN0ZW0uCi0tLQogU291cmNlL1dlYktpdDIvQ2hh bmdlTG9nICAgICAgICAgICAgICAgICAgICAgICAgICAgfCAgMzAgKysKIC4uLi9TaGFyZWQvV2Vi UHJvY2Vzc0NyZWF0aW9uUGFyYW1ldGVycy5jcHAgICAgICAgIHwgIDI0ICsrCiAuLi4vV2ViS2l0 Mi9TaGFyZWQvV2ViUHJvY2Vzc0NyZWF0aW9uUGFyYW1ldGVycy5oICB8ICAgOSArCiAuLi4vU2hh cmVkL2xpbnV4L1NlY2NvbXBGaWx0ZXJzL1N5c2NhbGxQb2xpY3kuY3BwICB8ICAxMyArCiAuLi4v 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