Re: privacy problem: text/html parts pull in network resources

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+From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>\r
+To: David Bremner <david@tethera.net>,\r
+       notmuch mailing list <notmuch@notmuchmail.org>\r
+Subject: Re: privacy problem: text/html parts pull in network resources\r
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+Date: Tue, 27 Jan 2015 22:47:35 -0500\r
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+On Sun 2015-01-25 12:51:43 -0500, David Bremner wrote:\r
+> Daniel Kahn Gillmor <dkg@fifthhorseman.net> writes:\r
+>\r
+>> If i send a message with a text/html part (either it's only text/html,\r
+>> or all parts are rendered, or it's multipart/alternative with only a\r
+>> text/html subpart) and that HTML has <img\r
+>> src="http://example.org/test.png"/> in it, then notmuch will make a\r
+>> network request for that image.\r
+>>\r
+>> This is a privacy disaster, because it enables an e-mail sender to use\r
+>> "web bugs" to tell when a given notmuch user has opened their e-mail.\r
+>\r
+> I've just pushed Austin's shr related series to master, so this problem\r
+> should be fixed as of commit b74ed1c. One tradeoff that we should at\r
+> least remark in NEWS, if not actually fix, is that I think there is now\r
+> no way to view such images in notmuch.  I don't know offhand what other\r
+> html renderers will do.\r
+\r
+thanks for this, David and Austin!\r
+\r
+Other html-rendering mail clients that are privacy-conscious will often\r
+provide a button or mechanism to indicate that some remote resources\r
+were requested by the page but weren't fetched (e.g. a button saying\r
+something like [Load Remote Images...]).  I have no idea who actually\r
+clicks on those buttons (or why), though, and even if we wanted them,\r
+we'd only want to add a button on an image that actually had remote\r
+network resources to load, and i don't know how we'd get that\r
+information propagated back up the rendering stack to make such a\r
+display decision.   So i'm fine with leaving it this way for now.\r
+\r
+        --dkg\r