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#rockbox log for 2016-03-20

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07:54:50[Saint]What a hilariously broken site.
07:55:17[Saint]A banner advertisement that covers half the title banner, and offers a "skip ad" button that closes the entire page.
07:55:30[Saint]...well done ninja advertisers.
07:56:20[Saint]I /probably/ wouldn't hit that url if you're on a windows box and not aggressively stopping in-page scripting.
07:57:50[Saint]The 'skip ad' button is pretty...odd, it ends up at ''
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16:03:39*__builtin has been thinking about a rockbox-based security device lately
16:04:05__builtinlike this, but in software:
16:05:10__builtinespecially the external RSA implementation
16:07:21__builtinI guess the hard part would be making it fast enough on a DAP
16:12:44__builtinthis looks promising though:
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16:15:56__builtinhmm, so 1.94 seconds to encrypt with RSA-2048 on an 8 MHz atmega
16:16:36__builtinbut more than 90 seconds to decrypt ._.
16:18:59__builtinand then there's the issue of finding a good entropy source
16:25:58__builtinregarding speed though, the target is probably going to be a 80MHz CPU, so assuming a linear speedup with clock rate, then it's 9 seconds for decryption
16:26:17__builtinwhich isn't totally unacceptable
16:27:47Slasheriyou cannot really compare an 8-bit cpu to a 32-bit cpu
16:28:32__builtinit's just a rough estimate
16:31:16Slasherivery rough estimate, most likely not even close. 32-bit cpu would be way faster, probably magnitudes faster with more useful instruction set, wider registers and so on
16:34:02__builtinyeah, which is good
16:37:25***Saving seen data "./dancer.seen"
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17:28:38*pamaury tries to implement a custom Qt View with a custom delegate with a custom item editor which should be able to resize itself and update the model when it does...that's tricky !
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17:37:30bluebrother^ok guys, I'm considering to drop OS X 10.4 and 10.5 support, at least for our release binaries.
17:37:38bluebrother^any thoughts on that? Objections?
17:38:18bluebrother^since the current OS X is 10.11 these days our user base on 10.5 and earlier shouldn't be big. If there are any at all.
17:57:31 Join Saratoga_ [0] (ac3817c3@gateway/web/freenode/ip.
17:58:13Saratoga_Bluebrother: sounds OK
17:58:31pamaurybluebrother^: how old is OS X 10.4 and 10.5 ?
17:59:20[Saint]pamaury: 2004~2005ish
17:59:27pamauryah yeah that's old :)
18:00:55[Saint]We should probably drop Rockbox support.
18:01:01[Saint]Makes OSX Tiger look young. ;)
18:01:32[Saint](was 10.4 Tiger? ...I wanna say yes.)
18:02:01[Saint]Oh. I was off some years. 10.4 is 2007 apparently.
18:03:19gevaertsWhat was the powerpc cutoff?
18:03:46gevaertsWas there an intel 32 bit cutoff?
18:04:35gevaertsAnd what's the money-for-upgrade policy for those versions?
18:04:48*gevaerts thinks they can probably be dropped, but he thinks those three questions are relevant :)
18:06:41gevaertsAh, 10.5 was the last powerpc one, and 10.6 was the last 32 bit one
18:07:24gevaertsOf course I don't know if the current build still supports either of those anyway
18:09:09bluebrother^10.6 was the intel cutoff
18:10:00bluebrother^and starting with 10.8 OS upgrades are free.
18:10:23bluebrother^though not all old machines run newer versions. Unsurprisingly :)
18:10:59bluebrother^Intel Core ends with 10.6. Core2 at least 10.9, depending on the machine
18:11:20gevaertsThey went to intel in 2006, so any surviving powerpc machine is ten years old now
18:11:24bluebrother^my years-old mini (with core2duo cpu) is still supported by current (10.11)
18:11:36gevaertsWhich is of course still newer than most DAPs that run rockbox :)
18:12:33bluebrother^problem is that you also need to use Qt4 for PPC support. And AFAIU current xcode doesn't ship ppc support anymore since years either.
18:13:02gevaertsI'd say dropping ppc is fine by now
18:15:15bluebrother^btw, I'm not planning to drop support from the code. Just the binaries.
18:15:50bluebrother^though I don't have any means to test on ppc and usually don't build for that anymore, so it might end up broken ...
18:15:54 Quit Saratoga_ (Ping timeout: 252 seconds)
18:16:11bluebrother^otoh, given the amount of changes we have in Rockbox Utility that shouldn't happen too soon :)
18:17:23gevaertsI suspect even dropping 10.6 would be fine, but if there's no current need for that...
18:17:58bluebrother^actually, Qt 5.6 enables c++11 support, which requires at least 10.7 :)
18:18:13bluebrother^but then staying at Qt 5.5 for now is not a big issue
18:18:38gevaertsThe last 10.6-at-the-latest machine was sold in august 2007
18:19:03bluebrother^so we need to wait another year to make it 10 years ;-)
18:19:17gevaertsUsing c++11 means actual development anyway :)
18:22:00gevaertsDropping 10.7 would mean dropping machines sold in 2009. That *would* get a little harsh for my tastes
18:22:12gevaertsBut then that's not in any way needed for anything
18:22:30[Saint]Your taste?
18:22:38*[Saint] agrees
18:28:18bluebrother^so. My plan is to try to find some time for a Rockbox Utility 1.4.1 the next couple of weeks. I might use the old build setup for that, but at least after that I won't build for ppc / 10.5 anymore.
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18:32:18gevaertsSounds good
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20:45:57__builtinhow would a rockbox-based crypto device communicate with a computer?
20:46:51[Saint]why would someone do such a thing?
20:47:26__builtinto protect their keys
20:48:00[Saint]on a device that can't offer any protection whatsoever for any content?
20:48:15__builtinthe keys would be symmetrically encrypted and be unlocked by a user password
20:50:00[Saint]and then what, pass it out plaintext after the fact over USB?
20:50:22[Saint]I seem to be missing something. This sounds to me like a convoluted solution to a problem no one has.
20:50:31__builtinno, it would perform the encryption on the device and spit out encrypted data
20:51:36gevaertsOne thing most crypto devices do is *not export private keys*, not even passphrase-encrypted
20:51:49[Saint]so you'd be doing complex encryption on a DAP when the host could do it orders of magnitude quicker? I'm lost.
20:51:53gevaertsThat doesn't block everyone, but it *is* useful, and I don't see you do that on a DAP
20:52:08__builtinit keeps the keys reasonably safe
20:52:31[Saint]and then dilutes that with way more points of failure.
20:52:47[Saint]and degrades the whole thing by running on shitty 15 year old DAP silicon.
20:53:06gevaertsI think that if you have that sort of requirements, things like a yubikey are cheap enough not to compromise
20:54:12 Quit nlogex (Quit: WeeChat 1.4)
20:59:18__builtinwhy not make it free?
20:59:49gevaertsMake what free? You can't do the same thing
21:00:00[Saint]Because a shitty solution that is free is still a shitty solution.
21:00:46__builtinit's obviously not going to be as secure as a purpose-built device
21:01:34__builtinbut it's better than having your encryption keys sitting on a hard drive waiting to get stolen
21:01:43gevaertsThere's also the thing that that sort of thing *has* to be done by people who really know what they're doing
21:01:54gevaertsBecause if not, there's literally no guarantee at all
21:03:12[Saint]Not that I think anyone would actually use it, but, wouldn't opening it up present some pretty serious issues for reversal?
21:03:36__builtinpardon me?
21:03:44[Saint]and since it lives inside an open OS, on a device with no practical way of offering any meaningful security...
21:04:34__builtinif the device gets stolen there's no security beyond the symmetric crypto, yes
21:04:36[Saint]s/no practical way of offering any meaningful security/no security period/
21:04:56gevaertsIf you mount de filesystem regularly, I don't think you gain much
21:05:19gevaertsAnd if you don't, you basically use your DAP exlusively for crypto, and then it's more expensive than a yubikey
21:06:27__builtinwell, you could (in theory) modify the USB mass storage driver to prohibit the reading of the blocks the key is on over USB
21:07:06gevaerts[Saint]: I believe the intended adversary here is a remote attacker
21:07:33__builtinyeah, as I said, nothing works if the device gets stolen
21:07:53gevaertsWill you block rockbox updates though?
21:09:04__builtinthe DAP could lcok itself down when it's attached for the purpose of security
21:09:06*[Saint] hard a really hard time not seeing rockblox
21:09:18[Saint]once again, dualboot.
21:09:38[Saint]not locking down shit in the OF now are we?
21:09:46__builtinagain, this doesn't guard against the device getting stolen
21:10:01__builtinit guards against someone getting remote access to your computer and stealing your keys
21:10:43[Saint]If someone has remote access and that level of escalation you have much bigger issues to consider.
21:11:59__builtinit still protects your keys
21:12:39gevaertsI think you could offer *some* extra security, but I also think it's minor enough that it's not worth doing. Especially since the entire implementation (which includes most of rockbox) is unlikely to be written with security in mind
21:12:40[Saint]how so? if we assume the attacker has remote access what's to stop them from just sniffing up USB traffic as well? Or pulling straight from RAM?
21:13:10gevaerts[Saint]: the point is that the *device* does the encryption, so the key doesn't get to USB
21:13:18[Saint]I really doubt this presents any serious obstacle to an attacker with remote access and a level of execution that is meaningful.
21:13:42__builtinand presumably the device would require user interaction before performing an operation
21:15:11[Saint]wait, I thought this was just a keystore? I guess I got confused. I guess then I'd revert back to "why would anyone want a DAP to be handling their encryption at the ridiculous pace it could manage?
21:15:36__builtinbecause it's not so ridiculous after all, considering the possible use-cases
21:15:42gevaerts[Saint]: you're not using it for full-disk encryption, presumably
21:16:08[Saint]anything over a few MB is going to be pretty bloody painful.
21:16:20__builtinan 8MHz microcontroller can perform RSA-2048 decryption/signing in 90 seconds
21:16:26gevaertsBut there are *many* usecases that don't need megabytes
21:16:43[Saint]if that's the _only_ thing it is doing, __builtin, yes. It can.
21:16:55[Saint]In this instance we know that's pretty unlikely though.
21:17:53[Saint]I could see this making some sense on a single target.
21:18:01__builtinmost of rockbox's targets are an order of magnitude faster than that
21:18:02gevaertsThe thing is that whatever you build will still be fairly full of holes, which means that it would be very dangerous for uninformed people to use
21:18:06[Saint]Nano 2G. Where we can actually use the HW crypto unit.
21:18:14gevaertsAnd then I'm not sure if providing it is a good thing
21:18:23__builtin[Saint]: it's an AES core, right?
21:18:39gevaertsAh yes. If you have *that*, things might get a lot more realistic
21:18:39[Saint]I believe so.
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21:19:09__builtinthat won't really help much, I don't think
21:19:29gevaertsDoes it offer secure key storage?
21:19:41__builtinthe only thing it could use AES for is key storage
21:19:53[Saint]Secure from "people", or from us?
21:20:17[Saint]Actually I'm not too sure either is true. Hmmmm.
21:20:21gevaertsSecure from people who forgot their electron microscope at home
21:20:43gevaertsAs in, you put a key in there, and then you can have the crypto unit *use* they key but you can't ask for it back
21:20:49[Saint]Well, it wasn't secure from Mr. Sparrman. So lets assume no. :)
21:21:13gevaertsThat's not what happened, was it?
21:21:21gevaertsHe didn't *extract* they key
21:21:24__builtinit can't perform RSA though
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21:50:08 Join XL-R8 [0] (5ceb1cde@gateway/web/freenode/ip.
21:51:35XL-R8How ya lads/lasses, new rockbox user here and trying to fine tune my ipod classic to give me the best in features and battery/ram, any suggestions/hints or tips for me :)
21:58:50 Quit XL-R8 (Ping timeout: 252 seconds)
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23:09:54__builtinwell, you probably don't want to be replacing any parts beyond (maybe) the HDD
23:10:01 Quit pamaury (Ping timeout: 240 seconds)
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23:10:20__builtinthere's very little to gain from "modding" it beyond that
23:15:49__builtinnot to mention that it very probably won't work
23:17:33[Saint]He's gone bud.
23:17:56__builtindang, ZNC doesn't show it
23:18:02__builtineven with buffextras
23:18:20[Saint][2016 03 21 09:51:37] <XL-R8> How ya lads/lasses, new rockbox user here and trying to fine tune my ipod classic to give me the best in features and battery/ram, any suggestions/hints or tips for me :)
23:18:20[Saint][2016 03 21 09:58:52] <−− XL-R8 (5ceb1cde@gateway/web/freenode/ip. has quit (Ping timeout: 252 seconds)
23:19:03__builtin7 minutes!
23:25:52[Saint]Well...we can only in good consciousness give him credit for 3 of those minutes.
23:26:05[Saint]FOr the other 4 minutes he was stuck in a lag shitstorm.
23:26:19[Saint]Who's to say he wouldn't have left sooner if his client didn't fuck out. :)
23:36:09__builtinregarding the "rockbox crypto device", I suppose it could present itself as an HID device and type out its output
23:36:29__builtinthe problem is then getting input to sign/decrypt
23:38:02[Saint]and HID being pretty fucky on pretty much everything.
23:39:21__builtinIs there a specialized protocol for this? The Googs are giving me nothing
23:42:55__builtinahh, there's ISO/IEC 7816
23:52:52saratogado you really want rockbox for this and not a microcontroller? you can get one with built in USB HID stacks for a couple bucks
23:55:37__builtinI guess it's not the best platform for this...

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