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41 Wed, 28 Jan 2015 15:57:28 -0800 (PST)
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42 From: Jinwoo Lee <jinwoo68@gmail.com>
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43 To: Daniel Kahn Gillmor <dkg@fifthhorseman.net>,
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44 David Bremner <david@tethera.net>,
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45 notmuch mailing list <notmuch@notmuchmail.org>
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46 Subject: Re: privacy problem: text/html parts pull in network resources
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47 In-Reply-To: <yq65h9vbtsyt.fsf@jinwoo-macbookair.roam.corp.google.com>
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48 References: <87ppa7q25w.fsf@alice.fifthhorseman.net>
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49 <87fvay3g0g.fsf@maritornes.cs.unb.ca>
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50 <871tmfin1k.fsf@alice.fifthhorseman.net>
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51 <yq65h9vbtsyt.fsf@jinwoo-macbookair.roam.corp.google.com>
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52 User-Agent: Notmuch/0.18.1 (http://notmuchmail.org) Emacs/24.4.1
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53 (x86_64-apple-darwin13.2.0)
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54 Date: Wed, 28 Jan 2015 15:57:25 -0800
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72 On Tue, Jan 27, 2015 at 08:44 PM, Jinwoo Lee <jinwoo68@gmail.com> wrote:
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73 > On Tue, Jan 27, 2015 at 07:47 PM, Daniel Kahn Gillmor <dkg@fifthhorseman.net> wrote:
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74 >> On Sun 2015-01-25 12:51:43 -0500, David Bremner wrote:
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75 >>> Daniel Kahn Gillmor <dkg@fifthhorseman.net> writes:
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77 >>>> If i send a message with a text/html part (either it's only text/html,
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78 >>>> or all parts are rendered, or it's multipart/alternative with only a
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79 >>>> text/html subpart) and that HTML has <img
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80 >>>> src="http://example.org/test.png"/> in it, then notmuch will make a
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81 >>>> network request for that image.
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83 >>>> This is a privacy disaster, because it enables an e-mail sender to use
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84 >>>> "web bugs" to tell when a given notmuch user has opened their e-mail.
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86 >>> I've just pushed Austin's shr related series to master, so this problem
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87 >>> should be fixed as of commit b74ed1c. One tradeoff that we should at
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88 >>> least remark in NEWS, if not actually fix, is that I think there is now
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89 >>> no way to view such images in notmuch. I don't know offhand what other
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90 >>> html renderers will do.
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92 >> thanks for this, David and Austin!
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94 >> Other html-rendering mail clients that are privacy-conscious will often
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95 >> provide a button or mechanism to indicate that some remote resources
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96 >> were requested by the page but weren't fetched (e.g. a button saying
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97 >> something like [Load Remote Images...]). I have no idea who actually
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98 >> clicks on those buttons (or why), though, and even if we wanted them,
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99 >> we'd only want to add a button on an image that actually had remote
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100 >> network resources to load, and i don't know how we'd get that
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101 >> information propagated back up the rendering stack to make such a
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102 >> display decision. So i'm fine with leaving it this way for now.
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104 > Well, most promotional emails contain remote images and their contents
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105 > are incomprehensible without those images. I ignore most of them but I
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106 > do read a few of those promotional emails. It would be great to have a
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107 > UI for loading remote resources.
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109 Do you mind if I add a boolean defcustom, which determines whether to
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110 block remote images? Its default value will be T (block), but people
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111 who want to see remote images can customize it.
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116 >> _______________________________________________
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119 >> http://notmuchmail.org/mailman/listinfo/notmuch
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