K4 sync reverse engineering

xifer · 10-15-2020, 12:01 AM

I imagine this has been tried long ago, but has anyone been able to reverse engineer the sync protocol built into the kindle 4?

Off the top of my head a man-in-the-middle "attack" seems doable involving mitmproxy and changing /etc/hosts (or via DNS) and replacing ssl/tls keys in /etc/ssl/certs/ca-certificates.crt and /usr/lib/java/cacerts.

Doesn't seem too involved with ssh access to the kindle... Does anyone know if this been done before or are there additional protections that prevent reverse engineering this?

NiLuJe · 10-15-2020, 07:06 AM

I vaguely recall some experiments on that front back in the K4/K5 days... You might want to try a GitHub search.

But I honestly don't remember how far it got, and if it's still applicable.

xifer · 10-16-2020, 01:22 AM

Good call on the GitHub search, certainly weeded out all the amazon.com search results. Still took a little while to find but Kindle Store Proxy might do what I'm looking for.

Thanks!

NiLuJe · 10-16-2020, 10:03 AM

That indeed looks like the very thing I vaguely remembered

.

10-15-2020, 12:01 AM	#1
xifer Junior Member Posts: 2 Karma: 10 Join Date: Oct 2020 Device: Kindle 4	sync reverse engineering I imagine this has been tried long ago, but has anyone been able to reverse engineer the sync protocol built into the kindle 4? Off the top of my head a man-in-the-middle "attack" seems doable involving mitmproxy and changing /etc/hosts (or via DNS) and replacing ssl/tls keys in /etc/ssl/certs/ca-certificates.crt and /usr/lib/java/cacerts. Doesn't seem too involved with ssh access to the kindle... Does anyone know if this been done before or are there additional protections that prevent reverse engineering this?

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10-15-2020, 07:06 AM	#2
NiLuJe BLAM! Posts: 13,506 Karma: 26047202 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	I vaguely recall some experiments on that front back in the K4/K5 days... You might want to try a GitHub search. But I honestly don't remember how far it got, and if it's still applicable.

10-16-2020, 01:22 AM	#3
xifer Junior Member Posts: 2 Karma: 10 Join Date: Oct 2020 Device: Kindle 4	Good call on the GitHub search, certainly weeded out all the amazon.com search results. Still took a little while to find but Kindle Store Proxy might do what I'm looking for. Thanks!

10-16-2020, 10:03 AM	#4
NiLuJe BLAM! Posts: 13,506 Karma: 26047202 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	That indeed looks like the very thing I vaguely remembered .

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