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* Re: [PATCH v3 0/3] Cryptomount detached headers
@ 2022-07-30  9:54 brutser
  2022-07-30 18:48 ` brutser
  2022-08-01 20:50 ` Glenn Washburn
  0 siblings, 2 replies; 25+ messages in thread
From: brutser @ 2022-07-30  9:54 UTC (permalink / raw)
  To: grub-devel; +Cc: dkiper, ps

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Glenn,



As I had no idea how to get the debug logs from qemu, I made screenshots, find them attached. As this is probably something I am doing wrong, I hope it shows from the logs.



https://imgur.com/a/rAlfZ77




Van: Glenn Washburn <development@efficientek.com>
Aan: brutser@perso.be
Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
Datum: 29/07/2022 21:27:48 Europe/Paris
Cc: grub-devel@gnu.org;
   dkiper@net-space.pl;
   ps@pks.im

On Fri, 29 Jul 2022 20:56:18 +0200 (CEST)
brutser@perso.be wrote:

> 
> testing detached header failed:
> 
> 
> 
> 1. built grub payload with following modules: ahci usb_keyboard part_msdos part_gpt at_keyboard cbfs cryptodisk luks2 lvm gcry_rijndael gcry_sha1 gcry_sha256 gcry_sha512
> 
> 2. encrypt a partition: cryptsetup luksFormat --type luks2 -q -h sha512 -s 512 --pbkdf pbkdf2 --header /path/to/header --luks2-metadata-size=16k --luks2-keyslots-size=512k /dev/sda1
> 
> (where --luks2-metadata-size=16k --luks2-keyslots-size=512k is optional, this is just to minimize header size, but I also tested without).
> 
> 3. from the grub cmd, i try to decrypt this partition using: cryptomount -H /path/to/header (ahci0,msdos1)
> 
> 
> 
> 4. I also tried luks1 encryption with detached header.
> 
> 
> 
> whatever I try, I always get the same error:
> 
> "no cryptodisk module can handle this device"
> 
> 
> 
> Is this feature not 100% implemented yet, I saw people already verifying the patches and would expect this to be working, so if yes, this seems like a bug.

This feature should be working in all cases, and if not there may be a
bug. I responded to your off-list email before seeing this one. I'll
repeat what I said there and let's continue this discussion on the list.

I see nothing obviously wrong with what you're doing, given the
information above. To further debug this, would you be able to send a
log of the serial output when the GRUB envvar debug is set to "all"
while running the cryptomount command? If so, please send compressed in
a reply to this email on the list.

If you can't because of hardware issues, would you be able to replicate
this in QEMU and grab the serial output from there? If you can boot the
system via other means, you should be able to use the raw disks (the
one with the LUKS volume and the other with the filesystem containing
the header file).

Glenn


_______________________________________________
Grub-devel mailing list
Grub-devel@gnu.org
https://lists.gnu.org/mailman/listinfo/grub-devel


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^ permalink raw reply	[flat|nested] 25+ messages in thread
* Re: [PATCH v3 0/3] Cryptomount detached headers
@ 2022-08-04 16:56 brutser
  2022-08-05  5:00 ` Glenn Washburn
  0 siblings, 1 reply; 25+ messages in thread
From: brutser @ 2022-08-04 16:56 UTC (permalink / raw)
  To: grub-devel; +Cc: dkiper, ps

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More testing done:

the problem most likely is triggered when encrypting partitions (see all my other comments to get a better picture).

I tested encrypting a complete device /dev/sdb with detached header and this worked fine, no issues, with logical volumes created.



So the problem now is consistent, coreboot, or no coreboot, when encrypting a partition, in my tests /dev/sda2, with a detached header, you cannot decrypt successfully using cryptomount.



cryptomount -H (hd0,msdos1)/header.bin (hd0,msdos2)

will ALWAYS result in the error: 



"no cryptodisk module can handle this device"



Strange is that it seems to be possible to ignore the partition and simply try to 'decrypt the device', which should not be possible of course, but it validates the passphrase (as seen below in comments), but

although it opens a crypto0 slot, this is not usable decrypted data.







Debug logs: https://imgur.com/a/onRBSMd



New comments below.

See comments below.


Van: Glenn Washburn <development@efficientek.com>
Aan: brutser--- via Grub-devel <grub-devel@gnu.org>
Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
Datum: 03/08/2022 21:54:14 Europe/Paris
Cc: brutser@perso.be;
   dkiper@net-space.pl;
   ps@pks.im

On Tue, 2 Aug 2022 22:49:27 +0200 (CEST)
brutser--- via Grub-devel <grub-devel@gnu.org> wrote:

> 
> Van: Glenn Washburn <development@efficientek.com>
> Aan: brutser--- via Grub-devel <grub-devel@gnu.org>
> Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
> Datum: 02/08/2022 20:58:17 Europe/Paris
> Cc: brutser@perso.be;
>    dkiper@net-space.pl;
>    ps@pks.im
> 
> Hi Bruster,
> 
> Are you able to add your responses inline like I have been doing in my
> replies? And not top-post, which is posting at the top.
> 
> I will reply here, though my mail client is not really doing a great job to get this inline response done, sorry for that.

Ok, I figured that. However, you've not responded to much of my
comments that I wrote inline. Perhaps you only read the first part of
my response and do not realize that I wrote more response further down.
Please look at the full email until you see my name, which indicates
that I am finished responding. Please respond to all of my questions,
otherwise it makes it difficult to help you and if you don't take the
time to respond to me fully I am less inclined to help. I would like to
get this issue sorted out, but I need you to help me debug it right now.

Also, I have never built GRUB with coreboot, so I don't have a way to
precisely reproduce your setup anyway. And it currently does work for
me.

Glenn

>>> Comments:
I think I read all your comments and tried to reply as best as possible.

I tried the following test to eliminate the coreboot issue >>

Qemu installation:

1. Minimal Debian 11.4 installation on /dev/sda1
2. git clone latest grub, make & make install, grub-install
3. Reboot Debian iso >
    Expert install Debian 11.4
    Exit to Shell >
    cryptsetup luksFormat --type luks2 -q -h sha512 -s 512 --pbkdf pbkdf2 --header /root/header.bin --luks2-metadata-size=16k --luks2-keyslots-size=512k /dev/sda2
    cryptsetup luksOpen --header /root/header.bin /dev/sda2 sda2crypt
    pvcreate /dev/mapper/sda2crypt
    vgcreate testvg /dev/mapper/sda2crypt
    lvcreate -l 100%FREE -n root testvg
4. Complete minimal debian 11.4 installation on encrypted lvm
5. Save header to /dev/sda1
6. Copy header file to target initramfs, populate crypttab, some scripts to finish the encryption

7. Finish installation and reboot.
8. Exit to Grub cmd >
    insmod luks2
    insmod lvm
    insmod cryptodisk
    cryptomount -H (hd0,msdos1)/header.bin (hd0,msdos2)

result: error: no cryptodisk module can handle this device.

>>> New comments:

Getting closer to a solution here, I was just playing around with it and suddenly I was asked passphrase when entering this line:
cryptomount -H (hd0,msdos1)/header.bin (hd0)

or when I tried this in the coreboot setup, I changed to: cryptomount -H (ahci0,msdos1)/header.bin (ahci0)

wrong passphrase and I get the correct error and correct passphrase and I get Slot "0" opened and "ls /" is showing me: (crypto0)

though it can't handle the logical volume and a simple "ls (crypto0)/" will give error: unknown filesystem.

But why does it accept (hd0), while we clearly encrypted the 2nd partition /dev/sda2 (hd0,msdos2) ?

Anyway, hope this helps.



> 
> Let me be clear on my testing environment, I was purely testing latest grub as payload for coreboot, so even on qemu, I am using coreboot for BIOS with my compiled grub as one of the payloads.
> I am testing on a basic Thinkpad laptop with x86_64 architecture.
> 
> "I'm not sure I understand why you're saying this.", I was basically just expressing that I was testing the functionality purely for my own setup, so if you wanted me to test more general (for example without coreboot), then you could say me.
> Not that it shouldn't work with coreboot obviously, but if other testing could give more accurate results and debug logs for example, I am willing to do that, that was all.
> 
> On Tue, 2 Aug 2022 02:26:58 +0200 (CEST)
> brutser--- via Grub-devel <grub-devel@gnu.org> wrote:
> 
> > 
> > 
> > Glenn,
> > 
> > 
> > 
> > But my testing is very limited, i only create grub payload for coreboot and then i create the encrypted sda2 from the debian expert installer etc.
> 
> I'm not sure I understand why you're saying this. Did I ask you to do
> something that you think you can't do because your "testing is very
> limited"? You've proven capable of modifying the source code to add
> debug log messages and successfully reproducing the issue in QEMU. That
> makes your testing ability not very limited in my opinion. What am I
> missing that you're wanting to convey here?
> 
> Since you've reproduced the issue in QEMU and I'm assuming that you're
> not running coreboot in QEMU, then I conclude that coreboot is not a
> relevant factor here. What exactly was the QEMU commandline you used in
> getting the output you previously created? Did you ever try to get the
> serial output with the QEMU options I suggested previously?
> 
> > 
> > If you got suggestions with this setup, how i can do another way of testing, let me know and I will do it.
> 
> Why do you need another way of testing? As I mentioned above you can
> modify the source code of GRUB and run that modified GRUB in QEMU. I
> don't think we need another way. Were you having problems adding the
> debug message to cryptodisk_read_hook I suggested in my last response?
> I'm starting to think there is an issue in the hook mechanism, but I'd
> like your help in confirming that.
> 
> > 
> > Van: brutser--- via Grub-devel <grub-devel@gnu.org>
> > Aan: grub-devel@gnu.org
> > Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
> > Datum: 02/08/2022 01:47:57 Europe/Paris
> > Cc: brutser@perso.be;
> >    dkiper@net-space.pl;
> >    ps@pks.im
> > 
> > 
> > 
> > Debian 11.4 for all the testing.
> 
> Thanks for this info, but that wasn't what I was asking for. I asked
> for the architecture and endianness. For example, are you running on
> x86_64 or i386 (64-bit vs 32-bit) x86 architecture? These are always
> little endian. But you could be running on a MIPS architecture that can
> be either big or little endian. I want this confirmed so I can get the
> full picture. I'm doubting now that this is important, but you never
> know.
> 
> From your response below, I believe that the host and the target are
> the same machine, but are you building GRUB on that machine as well?
> Are you running QEMU for testing on that machine as well?
> 
> I haven't tried to reproduce this issue locally yet due to time
> constraints and it may be a while before I can get to it. But we're
> getting close to the point where it may require me doing that.
> 
> Glenn
> 
> > 
> > as i said, i execute shell during installation, then simply enter the commands I wrote earlier:
> > 
> > 
> > 
> > cryptsetup luksFormat --type luks2 -q -h sha512 -s 512 --pbkdf pbkdf2 --header /root/header.bin --luks2-metadata-size=16k --luks2-keyslots-size=512k /dev/sda2
> > 
> > cryptsetup luksOpen --header /root/header.bin /dev/sda2 sda2crypt
> > 
> > pvcreate /dev/mapper/sda2crypt
> > 
> > vgcreate testvg /dev/mapper/sda2crypt
> > 
> > lvcreate -L 2G -n root testvg
> > 
> > 
> > 
> > - continue install debian 11.4
> > 
> > - chroot into system
> > 
> > - copy header
> > 
> > - populate crypttab etc.
> > 
> > 
> > 
> > this whole process works 100% fine with grub 2.04 and luks1 as i said before...
> > 
> > 
> > 
> > 
> > 
> > Van: Glenn Washburn <development@efficientek.com>
> > Aan: brutser--- via Grub-devel <grub-devel@gnu.org>
> > Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
> > Datum: 02/08/2022 01:24:47 Europe/Paris
> > Cc: brutser@perso.be;
> >    dkiper@net-space.pl;
> >    ps@pks.im
> > 
> > On Tue, 2 Aug 2022 00:21:09 +0200 (CEST)
> > brutser--- via Grub-devel <grub-devel@gnu.org> wrote:
> > 
> > > Glenn,
> > > 
> > > 
> > > 
> > > Still resorted to screenshots for the debug (with the added dprintf):
> > > 
> > > 
> > > 
> > > https://imgur.com/a/YkVMdBe
> > 
> > Ok, that confirms that the luks2 module is loaded and that the scan is
> > happening. Based on the output I think luks2_read_header must be
> > failing. That means that either disk reads are failing, which doesn't
> > seem like the case, the disk read hook is failing or the LUKS2 magic
> > bytes are not what they should be.
> > 
> > Have you verified that after creating the volume and header file that
> > cryptsetup/dm can open the volume successfully?
> > 
> > What architecture and endianness is the machine you're running
> > cryptsetup on and what is it for the one GRUB is running on?
> > 
> > To test the read hook, add 'grub_dprintf("luks2", "read hook
> > successed");' just before the last return statement in the function
> > cryptodisk_read_hook in grub-core/disk/cryptodisk.c.
> > 
> > Glenn
> > 
> > > 
> > > 
> > > 
> > > Van: Glenn Washburn <development@efficientek.com>
> > > Aan: brutser--- via Grub-devel <grub-devel@gnu.org>
> > > Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
> > > Datum: 01/08/2022 22:50:27 Europe/Paris
> > > Cc: brutser@perso.be;
> > >    dkiper@net-space.pl;
> > >    ps@pks.im
> > > 
> > > On Sat, 30 Jul 2022 11:54:32 +0200 (CEST)
> > > brutser--- via Grub-devel <grub-devel@gnu.org> wrote:
> > > 
> > > > Glenn,
> > > > 
> > > > 
> > > > 
> > > > As I had no idea how to get the debug logs from qemu, I made screenshots, find them attached. As this is probably something I am doing wrong, I hope it shows from the logs.
> > > > 
> > > > https://imgur.com/a/rAlfZ77
> > > 
> > > Getting the output to go to serial depends on the target. For i386
> > > using seabios, use "-fw_cfg name=etc/sercon-port,string=0 -serial
> > > stdio".
> > > 
> > > Unfortunately, I'm now seeing that there are no debug log messages
> > > in the luks2 module that would be shown in this case. How about putting
> > > the line 'grub_dprintf("entering luks_scan");' at the start of the
> > > function luks2_scan in grub-core/disk/luks2.c and then recompiling and
> > > getting the output?
> > > 
> > > Glenn
> > > 
> > > 
> > > > 
> > > > Van: Glenn Washburn <development@efficientek.com>
> > > > Aan: brutser@perso.be
> > > > Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
> > > > Datum: 29/07/2022 21:27:48 Europe/Paris
> > > > Cc: grub-devel@gnu.org;
> > > >    dkiper@net-space.pl;
> > > >    ps@pks.im
> > > > 
> > > > On Fri, 29 Jul 2022 20:56:18 +0200 (CEST)
> > > > brutser@perso.be wrote:
> > > > 
> > > > > 
> > > > > testing detached header failed:
> > > > > 
> > > > > 
> > > > > 
> > > > > 1. built grub payload with following modules: ahci usb_keyboard part_msdos part_gpt at_keyboard cbfs cryptodisk luks2 lvm gcry_rijndael gcry_sha1 gcry_sha256 gcry_sha512
> > > > > 
> > > > > 2. encrypt a partition: cryptsetup luksFormat --type luks2 -q -h sha512 -s 512 --pbkdf pbkdf2 --header /path/to/header --luks2-metadata-size=16k --luks2-keyslots-size=512k /dev/sda1
> > > > > 
> > > > > (where --luks2-metadata-size=16k --luks2-keyslots-size=512k is optional, this is just to minimize header size, but I also tested without).
> > > > > 
> > > > > 3. from the grub cmd, i try to decrypt this partition using: cryptomount -H /path/to/header (ahci0,msdos1)
> > > > > 
> > > > > 
> > > > > 
> > > > > 4. I also tried luks1 encryption with detached header.
> > > > > 
> > > > > 
> > > > > 
> > > > > whatever I try, I always get the same error:
> > > > > 
> > > > > "no cryptodisk module can handle this device"
> > > > > 
> > > > > 
> > > > > 
> > > > > Is this feature not 100% implemented yet, I saw people already verifying the patches and would expect this to be working, so if yes, this seems like a bug.
> > > > 
> > > > This feature should be working in all cases, and if not there may be a
> > > > bug. I responded to your off-list email before seeing this one. I'll
> > > > repeat what I said there and let's continue this discussion on the list.
> > > > 
> > > > I see nothing obviously wrong with what you're doing, given the
> > > > information above. To further debug this, would you be able to send a
> > > > log of the serial output when the GRUB envvar debug is set to "all"
> > > > while running the cryptomount command? If so, please send compressed in
> > > > a reply to this email on the list.
> > > > 
> > > > If you can't because of hardware issues, would you be able to replicate
> > > > this in QEMU and grab the serial output from there? If you can boot the
> > > > system via other means, you should be able to use the raw disks (the
> > > > one with the LUKS volume and the other with the filesystem containing
> > > > the header file).
> > > > 
> > > > Glenn
> > > > 
> > > > 
> > > > _______________________________________________
> > > > Grub-devel mailing list
> > > > Grub-devel@gnu.org
> > > > https://lists.gnu.org/mailman/listinfo/grub-devel
> > > > 
> > > 
> > > _______________________________________________
> > > Grub-devel mailing list
> > > Grub-devel@gnu.org
> > > https://lists.gnu.org/mailman/listinfo/grub-devel
> > > 
> > 
> > _______________________________________________
> > Grub-devel mailing list
> > Grub-devel@gnu.org
> > https://lists.gnu.org/mailman/listinfo/grub-devel
> > _______________________________________________
> > Grub-devel mailing list
> > Grub-devel@gnu.org
> > https://lists.gnu.org/mailman/listinfo/grub-devel
> > 
> 
> _______________________________________________
> Grub-devel mailing list
> Grub-devel@gnu.org
> https://lists.gnu.org/mailman/listinfo/grub-devel
> 

_______________________________________________
Grub-devel mailing list
Grub-devel@gnu.org
https://lists.gnu.org/mailman/listinfo/grub-devel


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^ permalink raw reply	[flat|nested] 25+ messages in thread
* Re: [PATCH v3 0/3] Cryptomount detached headers
@ 2022-08-04 16:24 brutser
  0 siblings, 0 replies; 25+ messages in thread
From: brutser @ 2022-08-04 16:24 UTC (permalink / raw)
  To: grub-devel; +Cc: dkiper, ps

[-- Attachment #1: Type: text/plain, Size: 14355 bytes --]

Debug logs: https://imgur.com/a/onRBSMd



New comments below.

See comments below.


Van: Glenn Washburn <development@efficientek.com>
Aan: brutser--- via Grub-devel <grub-devel@gnu.org>
Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
Datum: 03/08/2022 21:54:14 Europe/Paris
Cc: brutser@perso.be;
   dkiper@net-space.pl;
   ps@pks.im

On Tue, 2 Aug 2022 22:49:27 +0200 (CEST)
brutser--- via Grub-devel <grub-devel@gnu.org> wrote:

> 
> Van: Glenn Washburn <development@efficientek.com>
> Aan: brutser--- via Grub-devel <grub-devel@gnu.org>
> Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
> Datum: 02/08/2022 20:58:17 Europe/Paris
> Cc: brutser@perso.be;
>    dkiper@net-space.pl;
>    ps@pks.im
> 
> Hi Bruster,
> 
> Are you able to add your responses inline like I have been doing in my
> replies? And not top-post, which is posting at the top.
> 
> I will reply here, though my mail client is not really doing a great job to get this inline response done, sorry for that.

Ok, I figured that. However, you've not responded to much of my
comments that I wrote inline. Perhaps you only read the first part of
my response and do not realize that I wrote more response further down.
Please look at the full email until you see my name, which indicates
that I am finished responding. Please respond to all of my questions,
otherwise it makes it difficult to help you and if you don't take the
time to respond to me fully I am less inclined to help. I would like to
get this issue sorted out, but I need you to help me debug it right now.

Also, I have never built GRUB with coreboot, so I don't have a way to
precisely reproduce your setup anyway. And it currently does work for
me.

Glenn

>>> Comments:
I think I read all your comments and tried to reply as best as possible.

I tried the following test to eliminate the coreboot issue >>

Qemu installation:

1. Minimal Debian 11.4 installation on /dev/sda1
2. git clone latest grub, make & make install, grub-install
3. Reboot Debian iso >
    Expert install Debian 11.4
    Exit to Shell >
    cryptsetup luksFormat --type luks2 -q -h sha512 -s 512 --pbkdf pbkdf2 --header /root/header.bin --luks2-metadata-size=16k --luks2-keyslots-size=512k /dev/sda2
    cryptsetup luksOpen --header /root/header.bin /dev/sda2 sda2crypt
    pvcreate /dev/mapper/sda2crypt
    vgcreate testvg /dev/mapper/sda2crypt
    lvcreate -l 100%FREE -n root testvg
4. Complete minimal debian 11.4 installation on encrypted lvm
5. Save header to /dev/sda1
6. Copy header file to target initramfs, populate crypttab, some scripts to finish the encryption

7. Finish installation and reboot.
8. Exit to Grub cmd >
    insmod luks2
    insmod lvm
    insmod cryptodisk
    cryptomount -H (hd0,msdos1)/header.bin (hd0,msdos2)

result: error: no cryptodisk module can handle this device.

>>> New comments:

Getting closer to a solution here, I was just playing around with it and suddenly I was asked passphrase when entering this line:
cryptomount -H (hd0,msdos1)/header.bin (hd0)

or when I tried this in the coreboot setup, I changed to: cryptomount -H (ahci0,msdos1)/header.bin (ahci0)

wrong passphrase and I get the correct error and correct passphrase and I get Slot "0" opened and "ls /" is showing me: (crypto0)

though it can't handle the logical volume and a simple "ls (crypto0)/" will give error: unknown filesystem.

But why does it accept (hd0), while we clearly encrypted the 2nd partition /dev/sda2 (hd0,msdos2) ?

Anyway, hope this helps.



> 
> Let me be clear on my testing environment, I was purely testing latest grub as payload for coreboot, so even on qemu, I am using coreboot for BIOS with my compiled grub as one of the payloads.
> I am testing on a basic Thinkpad laptop with x86_64 architecture.
> 
> "I'm not sure I understand why you're saying this.", I was basically just expressing that I was testing the functionality purely for my own setup, so if you wanted me to test more general (for example without coreboot), then you could say me.
> Not that it shouldn't work with coreboot obviously, but if other testing could give more accurate results and debug logs for example, I am willing to do that, that was all.
> 
> On Tue, 2 Aug 2022 02:26:58 +0200 (CEST)
> brutser--- via Grub-devel <grub-devel@gnu.org> wrote:
> 
> > 
> > 
> > Glenn,
> > 
> > 
> > 
> > But my testing is very limited, i only create grub payload for coreboot and then i create the encrypted sda2 from the debian expert installer etc.
> 
> I'm not sure I understand why you're saying this. Did I ask you to do
> something that you think you can't do because your "testing is very
> limited"? You've proven capable of modifying the source code to add
> debug log messages and successfully reproducing the issue in QEMU. That
> makes your testing ability not very limited in my opinion. What am I
> missing that you're wanting to convey here?
> 
> Since you've reproduced the issue in QEMU and I'm assuming that you're
> not running coreboot in QEMU, then I conclude that coreboot is not a
> relevant factor here. What exactly was the QEMU commandline you used in
> getting the output you previously created? Did you ever try to get the
> serial output with the QEMU options I suggested previously?
> 
> > 
> > If you got suggestions with this setup, how i can do another way of testing, let me know and I will do it.
> 
> Why do you need another way of testing? As I mentioned above you can
> modify the source code of GRUB and run that modified GRUB in QEMU. I
> don't think we need another way. Were you having problems adding the
> debug message to cryptodisk_read_hook I suggested in my last response?
> I'm starting to think there is an issue in the hook mechanism, but I'd
> like your help in confirming that.
> 
> > 
> > Van: brutser--- via Grub-devel <grub-devel@gnu.org>
> > Aan: grub-devel@gnu.org
> > Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
> > Datum: 02/08/2022 01:47:57 Europe/Paris
> > Cc: brutser@perso.be;
> >    dkiper@net-space.pl;
> >    ps@pks.im
> > 
> > 
> > 
> > Debian 11.4 for all the testing.
> 
> Thanks for this info, but that wasn't what I was asking for. I asked
> for the architecture and endianness. For example, are you running on
> x86_64 or i386 (64-bit vs 32-bit) x86 architecture? These are always
> little endian. But you could be running on a MIPS architecture that can
> be either big or little endian. I want this confirmed so I can get the
> full picture. I'm doubting now that this is important, but you never
> know.
> 
> From your response below, I believe that the host and the target are
> the same machine, but are you building GRUB on that machine as well?
> Are you running QEMU for testing on that machine as well?
> 
> I haven't tried to reproduce this issue locally yet due to time
> constraints and it may be a while before I can get to it. But we're
> getting close to the point where it may require me doing that.
> 
> Glenn
> 
> > 
> > as i said, i execute shell during installation, then simply enter the commands I wrote earlier:
> > 
> > 
> > 
> > cryptsetup luksFormat --type luks2 -q -h sha512 -s 512 --pbkdf pbkdf2 --header /root/header.bin --luks2-metadata-size=16k --luks2-keyslots-size=512k /dev/sda2
> > 
> > cryptsetup luksOpen --header /root/header.bin /dev/sda2 sda2crypt
> > 
> > pvcreate /dev/mapper/sda2crypt
> > 
> > vgcreate testvg /dev/mapper/sda2crypt
> > 
> > lvcreate -L 2G -n root testvg
> > 
> > 
> > 
> > - continue install debian 11.4
> > 
> > - chroot into system
> > 
> > - copy header
> > 
> > - populate crypttab etc.
> > 
> > 
> > 
> > this whole process works 100% fine with grub 2.04 and luks1 as i said before...
> > 
> > 
> > 
> > 
> > 
> > Van: Glenn Washburn <development@efficientek.com>
> > Aan: brutser--- via Grub-devel <grub-devel@gnu.org>
> > Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
> > Datum: 02/08/2022 01:24:47 Europe/Paris
> > Cc: brutser@perso.be;
> >    dkiper@net-space.pl;
> >    ps@pks.im
> > 
> > On Tue, 2 Aug 2022 00:21:09 +0200 (CEST)
> > brutser--- via Grub-devel <grub-devel@gnu.org> wrote:
> > 
> > > Glenn,
> > > 
> > > 
> > > 
> > > Still resorted to screenshots for the debug (with the added dprintf):
> > > 
> > > 
> > > 
> > > https://imgur.com/a/YkVMdBe
> > 
> > Ok, that confirms that the luks2 module is loaded and that the scan is
> > happening. Based on the output I think luks2_read_header must be
> > failing. That means that either disk reads are failing, which doesn't
> > seem like the case, the disk read hook is failing or the LUKS2 magic
> > bytes are not what they should be.
> > 
> > Have you verified that after creating the volume and header file that
> > cryptsetup/dm can open the volume successfully?
> > 
> > What architecture and endianness is the machine you're running
> > cryptsetup on and what is it for the one GRUB is running on?
> > 
> > To test the read hook, add 'grub_dprintf("luks2", "read hook
> > successed");' just before the last return statement in the function
> > cryptodisk_read_hook in grub-core/disk/cryptodisk.c.
> > 
> > Glenn
> > 
> > > 
> > > 
> > > 
> > > Van: Glenn Washburn <development@efficientek.com>
> > > Aan: brutser--- via Grub-devel <grub-devel@gnu.org>
> > > Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
> > > Datum: 01/08/2022 22:50:27 Europe/Paris
> > > Cc: brutser@perso.be;
> > >    dkiper@net-space.pl;
> > >    ps@pks.im
> > > 
> > > On Sat, 30 Jul 2022 11:54:32 +0200 (CEST)
> > > brutser--- via Grub-devel <grub-devel@gnu.org> wrote:
> > > 
> > > > Glenn,
> > > > 
> > > > 
> > > > 
> > > > As I had no idea how to get the debug logs from qemu, I made screenshots, find them attached. As this is probably something I am doing wrong, I hope it shows from the logs.
> > > > 
> > > > https://imgur.com/a/rAlfZ77
> > > 
> > > Getting the output to go to serial depends on the target. For i386
> > > using seabios, use "-fw_cfg name=etc/sercon-port,string=0 -serial
> > > stdio".
> > > 
> > > Unfortunately, I'm now seeing that there are no debug log messages
> > > in the luks2 module that would be shown in this case. How about putting
> > > the line 'grub_dprintf("entering luks_scan");' at the start of the
> > > function luks2_scan in grub-core/disk/luks2.c and then recompiling and
> > > getting the output?
> > > 
> > > Glenn
> > > 
> > > 
> > > > 
> > > > Van: Glenn Washburn <development@efficientek.com>
> > > > Aan: brutser@perso.be
> > > > Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
> > > > Datum: 29/07/2022 21:27:48 Europe/Paris
> > > > Cc: grub-devel@gnu.org;
> > > >    dkiper@net-space.pl;
> > > >    ps@pks.im
> > > > 
> > > > On Fri, 29 Jul 2022 20:56:18 +0200 (CEST)
> > > > brutser@perso.be wrote:
> > > > 
> > > > > 
> > > > > testing detached header failed:
> > > > > 
> > > > > 
> > > > > 
> > > > > 1. built grub payload with following modules: ahci usb_keyboard part_msdos part_gpt at_keyboard cbfs cryptodisk luks2 lvm gcry_rijndael gcry_sha1 gcry_sha256 gcry_sha512
> > > > > 
> > > > > 2. encrypt a partition: cryptsetup luksFormat --type luks2 -q -h sha512 -s 512 --pbkdf pbkdf2 --header /path/to/header --luks2-metadata-size=16k --luks2-keyslots-size=512k /dev/sda1
> > > > > 
> > > > > (where --luks2-metadata-size=16k --luks2-keyslots-size=512k is optional, this is just to minimize header size, but I also tested without).
> > > > > 
> > > > > 3. from the grub cmd, i try to decrypt this partition using: cryptomount -H /path/to/header (ahci0,msdos1)
> > > > > 
> > > > > 
> > > > > 
> > > > > 4. I also tried luks1 encryption with detached header.
> > > > > 
> > > > > 
> > > > > 
> > > > > whatever I try, I always get the same error:
> > > > > 
> > > > > "no cryptodisk module can handle this device"
> > > > > 
> > > > > 
> > > > > 
> > > > > Is this feature not 100% implemented yet, I saw people already verifying the patches and would expect this to be working, so if yes, this seems like a bug.
> > > > 
> > > > This feature should be working in all cases, and if not there may be a
> > > > bug. I responded to your off-list email before seeing this one. I'll
> > > > repeat what I said there and let's continue this discussion on the list.
> > > > 
> > > > I see nothing obviously wrong with what you're doing, given the
> > > > information above. To further debug this, would you be able to send a
> > > > log of the serial output when the GRUB envvar debug is set to "all"
> > > > while running the cryptomount command? If so, please send compressed in
> > > > a reply to this email on the list.
> > > > 
> > > > If you can't because of hardware issues, would you be able to replicate
> > > > this in QEMU and grab the serial output from there? If you can boot the
> > > > system via other means, you should be able to use the raw disks (the
> > > > one with the LUKS volume and the other with the filesystem containing
> > > > the header file).
> > > > 
> > > > Glenn
> > > > 
> > > > 
> > > > _______________________________________________
> > > > Grub-devel mailing list
> > > > Grub-devel@gnu.org
> > > > https://lists.gnu.org/mailman/listinfo/grub-devel
> > > > 
> > > 
> > > _______________________________________________
> > > Grub-devel mailing list
> > > Grub-devel@gnu.org
> > > https://lists.gnu.org/mailman/listinfo/grub-devel
> > > 
> > 
> > _______________________________________________
> > Grub-devel mailing list
> > Grub-devel@gnu.org
> > https://lists.gnu.org/mailman/listinfo/grub-devel
> > _______________________________________________
> > Grub-devel mailing list
> > Grub-devel@gnu.org
> > https://lists.gnu.org/mailman/listinfo/grub-devel
> > 
> 
> _______________________________________________
> Grub-devel mailing list
> Grub-devel@gnu.org
> https://lists.gnu.org/mailman/listinfo/grub-devel
> 

_______________________________________________
Grub-devel mailing list
Grub-devel@gnu.org
https://lists.gnu.org/mailman/listinfo/grub-devel


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^ permalink raw reply	[flat|nested] 25+ messages in thread
* Re: [PATCH v3 0/3] Cryptomount detached headers
@ 2022-08-03 23:54 brutser
  0 siblings, 0 replies; 25+ messages in thread
From: brutser @ 2022-08-03 23:54 UTC (permalink / raw)
  To: grub-devel; +Cc: dkiper, ps

[-- Attachment #1: Type: text/plain, Size: 14308 bytes --]

New comments below.

See comments below.


Van: Glenn Washburn <development@efficientek.com>
Aan: brutser--- via Grub-devel <grub-devel@gnu.org>
Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
Datum: 03/08/2022 21:54:14 Europe/Paris
Cc: brutser@perso.be;
   dkiper@net-space.pl;
   ps@pks.im

On Tue, 2 Aug 2022 22:49:27 +0200 (CEST)
brutser--- via Grub-devel <grub-devel@gnu.org> wrote:

> 
> Van: Glenn Washburn <development@efficientek.com>
> Aan: brutser--- via Grub-devel <grub-devel@gnu.org>
> Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
> Datum: 02/08/2022 20:58:17 Europe/Paris
> Cc: brutser@perso.be;
>    dkiper@net-space.pl;
>    ps@pks.im
> 
> Hi Bruster,
> 
> Are you able to add your responses inline like I have been doing in my
> replies? And not top-post, which is posting at the top.
> 
> I will reply here, though my mail client is not really doing a great job to get this inline response done, sorry for that.

Ok, I figured that. However, you've not responded to much of my
comments that I wrote inline. Perhaps you only read the first part of
my response and do not realize that I wrote more response further down.
Please look at the full email until you see my name, which indicates
that I am finished responding. Please respond to all of my questions,
otherwise it makes it difficult to help you and if you don't take the
time to respond to me fully I am less inclined to help. I would like to
get this issue sorted out, but I need you to help me debug it right now.

Also, I have never built GRUB with coreboot, so I don't have a way to
precisely reproduce your setup anyway. And it currently does work for
me.

Glenn

>>> Comments:
I think I read all your comments and tried to reply as best as possible.

I tried the following test to eliminate the coreboot issue >>

Qemu installation:

1. Minimal Debian 11.4 installation on /dev/sda1
2. git clone latest grub, make & make install, grub-install
3. Reboot Debian iso >
    Expert install Debian 11.4
    Exit to Shell >
    cryptsetup luksFormat --type luks2 -q -h sha512 -s 512 --pbkdf pbkdf2 --header /root/header.bin --luks2-metadata-size=16k --luks2-keyslots-size=512k /dev/sda2
    cryptsetup luksOpen --header /root/header.bin /dev/sda2 sda2crypt
    pvcreate /dev/mapper/sda2crypt
    vgcreate testvg /dev/mapper/sda2crypt
    lvcreate -l 100%FREE -n root testvg
4. Complete minimal debian 11.4 installation on encrypted lvm
5. Save header to /dev/sda1
6. Copy header file to target initramfs, populate crypttab, some scripts to finish the encryption

7. Finish installation and reboot.
8. Exit to Grub cmd >
    insmod luks2
    insmod lvm
    insmod cryptodisk
    cryptomount -H (hd0,msdos1)/header.bin (hd0,msdos2)

result: error: no cryptodisk module can handle this device.

>>> New comments:

Getting closer to a solution here, I was just playing around with it and suddenly I was asked passphrase when entering this line:
cryptomount -H (hd0,msdos1)/header.bin (hd0)

or when I tried this in the coreboot setup, I changed to: cryptomount -H (ahci0,msdos1)/header.bin (ahci0)

wrong passphrase and I get the correct error and correct passphrase and I get Slot "0" opened and "ls /" is showing me: (crypto0)

though it can't handle the logical volume and a simple "ls (crypto0)/" will give error: unknown filesystem.

But why does it accept (hd0), while we clearly encrypted the 2nd partition /dev/sda2 (hd0,msdos2) ?

Anyway, hope this helps.



> 
> Let me be clear on my testing environment, I was purely testing latest grub as payload for coreboot, so even on qemu, I am using coreboot for BIOS with my compiled grub as one of the payloads.
> I am testing on a basic Thinkpad laptop with x86_64 architecture.
> 
> "I'm not sure I understand why you're saying this.", I was basically just expressing that I was testing the functionality purely for my own setup, so if you wanted me to test more general (for example without coreboot), then you could say me.
> Not that it shouldn't work with coreboot obviously, but if other testing could give more accurate results and debug logs for example, I am willing to do that, that was all.
> 
> On Tue, 2 Aug 2022 02:26:58 +0200 (CEST)
> brutser--- via Grub-devel <grub-devel@gnu.org> wrote:
> 
> > 
> > 
> > Glenn,
> > 
> > 
> > 
> > But my testing is very limited, i only create grub payload for coreboot and then i create the encrypted sda2 from the debian expert installer etc.
> 
> I'm not sure I understand why you're saying this. Did I ask you to do
> something that you think you can't do because your "testing is very
> limited"? You've proven capable of modifying the source code to add
> debug log messages and successfully reproducing the issue in QEMU. That
> makes your testing ability not very limited in my opinion. What am I
> missing that you're wanting to convey here?
> 
> Since you've reproduced the issue in QEMU and I'm assuming that you're
> not running coreboot in QEMU, then I conclude that coreboot is not a
> relevant factor here. What exactly was the QEMU commandline you used in
> getting the output you previously created? Did you ever try to get the
> serial output with the QEMU options I suggested previously?
> 
> > 
> > If you got suggestions with this setup, how i can do another way of testing, let me know and I will do it.
> 
> Why do you need another way of testing? As I mentioned above you can
> modify the source code of GRUB and run that modified GRUB in QEMU. I
> don't think we need another way. Were you having problems adding the
> debug message to cryptodisk_read_hook I suggested in my last response?
> I'm starting to think there is an issue in the hook mechanism, but I'd
> like your help in confirming that.
> 
> > 
> > Van: brutser--- via Grub-devel <grub-devel@gnu.org>
> > Aan: grub-devel@gnu.org
> > Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
> > Datum: 02/08/2022 01:47:57 Europe/Paris
> > Cc: brutser@perso.be;
> >    dkiper@net-space.pl;
> >    ps@pks.im
> > 
> > 
> > 
> > Debian 11.4 for all the testing.
> 
> Thanks for this info, but that wasn't what I was asking for. I asked
> for the architecture and endianness. For example, are you running on
> x86_64 or i386 (64-bit vs 32-bit) x86 architecture? These are always
> little endian. But you could be running on a MIPS architecture that can
> be either big or little endian. I want this confirmed so I can get the
> full picture. I'm doubting now that this is important, but you never
> know.
> 
> From your response below, I believe that the host and the target are
> the same machine, but are you building GRUB on that machine as well?
> Are you running QEMU for testing on that machine as well?
> 
> I haven't tried to reproduce this issue locally yet due to time
> constraints and it may be a while before I can get to it. But we're
> getting close to the point where it may require me doing that.
> 
> Glenn
> 
> > 
> > as i said, i execute shell during installation, then simply enter the commands I wrote earlier:
> > 
> > 
> > 
> > cryptsetup luksFormat --type luks2 -q -h sha512 -s 512 --pbkdf pbkdf2 --header /root/header.bin --luks2-metadata-size=16k --luks2-keyslots-size=512k /dev/sda2
> > 
> > cryptsetup luksOpen --header /root/header.bin /dev/sda2 sda2crypt
> > 
> > pvcreate /dev/mapper/sda2crypt
> > 
> > vgcreate testvg /dev/mapper/sda2crypt
> > 
> > lvcreate -L 2G -n root testvg
> > 
> > 
> > 
> > - continue install debian 11.4
> > 
> > - chroot into system
> > 
> > - copy header
> > 
> > - populate crypttab etc.
> > 
> > 
> > 
> > this whole process works 100% fine with grub 2.04 and luks1 as i said before...
> > 
> > 
> > 
> > 
> > 
> > Van: Glenn Washburn <development@efficientek.com>
> > Aan: brutser--- via Grub-devel <grub-devel@gnu.org>
> > Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
> > Datum: 02/08/2022 01:24:47 Europe/Paris
> > Cc: brutser@perso.be;
> >    dkiper@net-space.pl;
> >    ps@pks.im
> > 
> > On Tue, 2 Aug 2022 00:21:09 +0200 (CEST)
> > brutser--- via Grub-devel <grub-devel@gnu.org> wrote:
> > 
> > > Glenn,
> > > 
> > > 
> > > 
> > > Still resorted to screenshots for the debug (with the added dprintf):
> > > 
> > > 
> > > 
> > > https://imgur.com/a/YkVMdBe
> > 
> > Ok, that confirms that the luks2 module is loaded and that the scan is
> > happening. Based on the output I think luks2_read_header must be
> > failing. That means that either disk reads are failing, which doesn't
> > seem like the case, the disk read hook is failing or the LUKS2 magic
> > bytes are not what they should be.
> > 
> > Have you verified that after creating the volume and header file that
> > cryptsetup/dm can open the volume successfully?
> > 
> > What architecture and endianness is the machine you're running
> > cryptsetup on and what is it for the one GRUB is running on?
> > 
> > To test the read hook, add 'grub_dprintf("luks2", "read hook
> > successed");' just before the last return statement in the function
> > cryptodisk_read_hook in grub-core/disk/cryptodisk.c.
> > 
> > Glenn
> > 
> > > 
> > > 
> > > 
> > > Van: Glenn Washburn <development@efficientek.com>
> > > Aan: brutser--- via Grub-devel <grub-devel@gnu.org>
> > > Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
> > > Datum: 01/08/2022 22:50:27 Europe/Paris
> > > Cc: brutser@perso.be;
> > >    dkiper@net-space.pl;
> > >    ps@pks.im
> > > 
> > > On Sat, 30 Jul 2022 11:54:32 +0200 (CEST)
> > > brutser--- via Grub-devel <grub-devel@gnu.org> wrote:
> > > 
> > > > Glenn,
> > > > 
> > > > 
> > > > 
> > > > As I had no idea how to get the debug logs from qemu, I made screenshots, find them attached. As this is probably something I am doing wrong, I hope it shows from the logs.
> > > > 
> > > > https://imgur.com/a/rAlfZ77
> > > 
> > > Getting the output to go to serial depends on the target. For i386
> > > using seabios, use "-fw_cfg name=etc/sercon-port,string=0 -serial
> > > stdio".
> > > 
> > > Unfortunately, I'm now seeing that there are no debug log messages
> > > in the luks2 module that would be shown in this case. How about putting
> > > the line 'grub_dprintf("entering luks_scan");' at the start of the
> > > function luks2_scan in grub-core/disk/luks2.c and then recompiling and
> > > getting the output?
> > > 
> > > Glenn
> > > 
> > > 
> > > > 
> > > > Van: Glenn Washburn <development@efficientek.com>
> > > > Aan: brutser@perso.be
> > > > Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
> > > > Datum: 29/07/2022 21:27:48 Europe/Paris
> > > > Cc: grub-devel@gnu.org;
> > > >    dkiper@net-space.pl;
> > > >    ps@pks.im
> > > > 
> > > > On Fri, 29 Jul 2022 20:56:18 +0200 (CEST)
> > > > brutser@perso.be wrote:
> > > > 
> > > > > 
> > > > > testing detached header failed:
> > > > > 
> > > > > 
> > > > > 
> > > > > 1. built grub payload with following modules: ahci usb_keyboard part_msdos part_gpt at_keyboard cbfs cryptodisk luks2 lvm gcry_rijndael gcry_sha1 gcry_sha256 gcry_sha512
> > > > > 
> > > > > 2. encrypt a partition: cryptsetup luksFormat --type luks2 -q -h sha512 -s 512 --pbkdf pbkdf2 --header /path/to/header --luks2-metadata-size=16k --luks2-keyslots-size=512k /dev/sda1
> > > > > 
> > > > > (where --luks2-metadata-size=16k --luks2-keyslots-size=512k is optional, this is just to minimize header size, but I also tested without).
> > > > > 
> > > > > 3. from the grub cmd, i try to decrypt this partition using: cryptomount -H /path/to/header (ahci0,msdos1)
> > > > > 
> > > > > 
> > > > > 
> > > > > 4. I also tried luks1 encryption with detached header.
> > > > > 
> > > > > 
> > > > > 
> > > > > whatever I try, I always get the same error:
> > > > > 
> > > > > "no cryptodisk module can handle this device"
> > > > > 
> > > > > 
> > > > > 
> > > > > Is this feature not 100% implemented yet, I saw people already verifying the patches and would expect this to be working, so if yes, this seems like a bug.
> > > > 
> > > > This feature should be working in all cases, and if not there may be a
> > > > bug. I responded to your off-list email before seeing this one. I'll
> > > > repeat what I said there and let's continue this discussion on the list.
> > > > 
> > > > I see nothing obviously wrong with what you're doing, given the
> > > > information above. To further debug this, would you be able to send a
> > > > log of the serial output when the GRUB envvar debug is set to "all"
> > > > while running the cryptomount command? If so, please send compressed in
> > > > a reply to this email on the list.
> > > > 
> > > > If you can't because of hardware issues, would you be able to replicate
> > > > this in QEMU and grab the serial output from there? If you can boot the
> > > > system via other means, you should be able to use the raw disks (the
> > > > one with the LUKS volume and the other with the filesystem containing
> > > > the header file).
> > > > 
> > > > Glenn
> > > > 
> > > > 
> > > > _______________________________________________
> > > > Grub-devel mailing list
> > > > Grub-devel@gnu.org
> > > > https://lists.gnu.org/mailman/listinfo/grub-devel
> > > > 
> > > 
> > > _______________________________________________
> > > Grub-devel mailing list
> > > Grub-devel@gnu.org
> > > https://lists.gnu.org/mailman/listinfo/grub-devel
> > > 
> > 
> > _______________________________________________
> > Grub-devel mailing list
> > Grub-devel@gnu.org
> > https://lists.gnu.org/mailman/listinfo/grub-devel
> > _______________________________________________
> > Grub-devel mailing list
> > Grub-devel@gnu.org
> > https://lists.gnu.org/mailman/listinfo/grub-devel
> > 
> 
> _______________________________________________
> Grub-devel mailing list
> Grub-devel@gnu.org
> https://lists.gnu.org/mailman/listinfo/grub-devel
> 

_______________________________________________
Grub-devel mailing list
Grub-devel@gnu.org
https://lists.gnu.org/mailman/listinfo/grub-devel


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^ permalink raw reply	[flat|nested] 25+ messages in thread
* Re: [PATCH v3 0/3] Cryptomount detached headers
@ 2022-08-01 23:47 brutser
  2022-08-02  0:26 ` brutser
  0 siblings, 1 reply; 25+ messages in thread
From: brutser @ 2022-08-01 23:47 UTC (permalink / raw)
  To: grub-devel; +Cc: dkiper, ps

[-- Attachment #1: Type: text/plain, Size: 6018 bytes --]



Debian 11.4 for all the testing.

as i said, i execute shell during installation, then simply enter the commands I wrote earlier:



cryptsetup luksFormat --type luks2 -q -h sha512 -s 512 --pbkdf pbkdf2 --header /root/header.bin --luks2-metadata-size=16k --luks2-keyslots-size=512k /dev/sda2

cryptsetup luksOpen --header /root/header.bin /dev/sda2 sda2crypt

pvcreate /dev/mapper/sda2crypt

vgcreate testvg /dev/mapper/sda2crypt

lvcreate -L 2G -n root testvg



- continue install debian 11.4

- chroot into system

- copy header

- populate crypttab etc.



this whole process works 100% fine with grub 2.04 and luks1 as i said before...





Van: Glenn Washburn <development@efficientek.com>
Aan: brutser--- via Grub-devel <grub-devel@gnu.org>
Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
Datum: 02/08/2022 01:24:47 Europe/Paris
Cc: brutser@perso.be;
   dkiper@net-space.pl;
   ps@pks.im

On Tue, 2 Aug 2022 00:21:09 +0200 (CEST)
brutser--- via Grub-devel <grub-devel@gnu.org> wrote:

> Glenn,
> 
> 
> 
> Still resorted to screenshots for the debug (with the added dprintf):
> 
> 
> 
> https://imgur.com/a/YkVMdBe

Ok, that confirms that the luks2 module is loaded and that the scan is
happening. Based on the output I think luks2_read_header must be
failing. That means that either disk reads are failing, which doesn't
seem like the case, the disk read hook is failing or the LUKS2 magic
bytes are not what they should be.

Have you verified that after creating the volume and header file that
cryptsetup/dm can open the volume successfully?

What architecture and endianness is the machine you're running
cryptsetup on and what is it for the one GRUB is running on?

To test the read hook, add 'grub_dprintf("luks2", "read hook
successed");' just before the last return statement in the function
cryptodisk_read_hook in grub-core/disk/cryptodisk.c.

Glenn

> 
> 
> 
> Van: Glenn Washburn <development@efficientek.com>
> Aan: brutser--- via Grub-devel <grub-devel@gnu.org>
> Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
> Datum: 01/08/2022 22:50:27 Europe/Paris
> Cc: brutser@perso.be;
>    dkiper@net-space.pl;
>    ps@pks.im
> 
> On Sat, 30 Jul 2022 11:54:32 +0200 (CEST)
> brutser--- via Grub-devel <grub-devel@gnu.org> wrote:
> 
> > Glenn,
> > 
> > 
> > 
> > As I had no idea how to get the debug logs from qemu, I made screenshots, find them attached. As this is probably something I am doing wrong, I hope it shows from the logs.
> > 
> > https://imgur.com/a/rAlfZ77
> 
> Getting the output to go to serial depends on the target. For i386
> using seabios, use "-fw_cfg name=etc/sercon-port,string=0 -serial
> stdio".
> 
> Unfortunately, I'm now seeing that there are no debug log messages
> in the luks2 module that would be shown in this case. How about putting
> the line 'grub_dprintf("entering luks_scan");' at the start of the
> function luks2_scan in grub-core/disk/luks2.c and then recompiling and
> getting the output?
> 
> Glenn
> 
> 
> > 
> > Van: Glenn Washburn <development@efficientek.com>
> > Aan: brutser@perso.be
> > Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
> > Datum: 29/07/2022 21:27:48 Europe/Paris
> > Cc: grub-devel@gnu.org;
> >    dkiper@net-space.pl;
> >    ps@pks.im
> > 
> > On Fri, 29 Jul 2022 20:56:18 +0200 (CEST)
> > brutser@perso.be wrote:
> > 
> > > 
> > > testing detached header failed:
> > > 
> > > 
> > > 
> > > 1. built grub payload with following modules: ahci usb_keyboard part_msdos part_gpt at_keyboard cbfs cryptodisk luks2 lvm gcry_rijndael gcry_sha1 gcry_sha256 gcry_sha512
> > > 
> > > 2. encrypt a partition: cryptsetup luksFormat --type luks2 -q -h sha512 -s 512 --pbkdf pbkdf2 --header /path/to/header --luks2-metadata-size=16k --luks2-keyslots-size=512k /dev/sda1
> > > 
> > > (where --luks2-metadata-size=16k --luks2-keyslots-size=512k is optional, this is just to minimize header size, but I also tested without).
> > > 
> > > 3. from the grub cmd, i try to decrypt this partition using: cryptomount -H /path/to/header (ahci0,msdos1)
> > > 
> > > 
> > > 
> > > 4. I also tried luks1 encryption with detached header.
> > > 
> > > 
> > > 
> > > whatever I try, I always get the same error:
> > > 
> > > "no cryptodisk module can handle this device"
> > > 
> > > 
> > > 
> > > Is this feature not 100% implemented yet, I saw people already verifying the patches and would expect this to be working, so if yes, this seems like a bug.
> > 
> > This feature should be working in all cases, and if not there may be a
> > bug. I responded to your off-list email before seeing this one. I'll
> > repeat what I said there and let's continue this discussion on the list.
> > 
> > I see nothing obviously wrong with what you're doing, given the
> > information above. To further debug this, would you be able to send a
> > log of the serial output when the GRUB envvar debug is set to "all"
> > while running the cryptomount command? If so, please send compressed in
> > a reply to this email on the list.
> > 
> > If you can't because of hardware issues, would you be able to replicate
> > this in QEMU and grab the serial output from there? If you can boot the
> > system via other means, you should be able to use the raw disks (the
> > one with the LUKS volume and the other with the filesystem containing
> > the header file).
> > 
> > Glenn
> > 
> > 
> > _______________________________________________
> > Grub-devel mailing list
> > Grub-devel@gnu.org
> > https://lists.gnu.org/mailman/listinfo/grub-devel
> > 
> 
> _______________________________________________
> Grub-devel mailing list
> Grub-devel@gnu.org
> https://lists.gnu.org/mailman/listinfo/grub-devel
> 

_______________________________________________
Grub-devel mailing list
Grub-devel@gnu.org
https://lists.gnu.org/mailman/listinfo/grub-devel


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^ permalink raw reply	[flat|nested] 25+ messages in thread
* Re: [PATCH v3 0/3] Cryptomount detached headers
@ 2022-07-29 20:01 brutser
  0 siblings, 0 replies; 25+ messages in thread
From: brutser @ 2022-07-29 20:01 UTC (permalink / raw)
  To: grub-devel; +Cc: dkiper, ps

[-- Attachment #1: Type: text/plain, Size: 3636 bytes --]

Hi Glenn, 



To explain in more detail how I run my tests, because the whole picture can give you a better understanding as to why it fails with me:

1. As grub payload is used for coreboot, I first build coreboot for the system (default build, nothing special).

2. To build grub:

git clone https://git.savannah.gnu.org/git/grub.git

./bootstrap

./autogen.sh

./configure --with-platform=coreboot --disable-werror

make



3. Change modules in Makefile to match the ones I wrote earlier.

4. make default_payload.elf



5. Installation debian (expert install)

6. Encrypt partition

cryptsetup luksFormat --type luks2 -q -h sha512 -s 512 --pbkdf pbkdf2 --header /path/to/header --luks2-metadata-size=16k --luks2-keyslots-size=512k /dev/sda1

or LUKS1:

cryptsetup luksFormat --cipher aes-xts-plain64 --hash=sha256 --key-size=512 --header /path/to/header --type luks1 /dev/sda1

7. Create necessary logical volumes and start installation debian

8. add crypttab, copy the header and keyfiles to target system.



This exact same setup works fine with grub 2.04 and john lane's patches: https://grub.johnlane.ie/ (obviously only LUKS1 support).



I will try to debug, not really experience with that, but will try to figure it out.



Van: Glenn Washburn <development@efficientek.com>
Aan: brutser@perso.be
Onderwerp: Re: [PATCH v3 0/3] Cryptomount detached headers
Datum: 29/07/2022 21:27:48 Europe/Paris
Cc: grub-devel@gnu.org;
   dkiper@net-space.pl;
   ps@pks.im

On Fri, 29 Jul 2022 20:56:18 +0200 (CEST)
brutser@perso.be wrote:

> 
> testing detached header failed:
> 
> 
> 
> 1. built grub payload with following modules: ahci usb_keyboard part_msdos part_gpt at_keyboard cbfs cryptodisk luks2 lvm gcry_rijndael gcry_sha1 gcry_sha256 gcry_sha512
> 
> 2. encrypt a partition: cryptsetup luksFormat --type luks2 -q -h sha512 -s 512 --pbkdf pbkdf2 --header /path/to/header --luks2-metadata-size=16k --luks2-keyslots-size=512k /dev/sda1
> 
> (where --luks2-metadata-size=16k --luks2-keyslots-size=512k is optional, this is just to minimize header size, but I also tested without).
> 
> 3. from the grub cmd, i try to decrypt this partition using: cryptomount -H /path/to/header (ahci0,msdos1)
> 
> 
> 
> 4. I also tried luks1 encryption with detached header.
> 
> 
> 
> whatever I try, I always get the same error:
> 
> "no cryptodisk module can handle this device"
> 
> 
> 
> Is this feature not 100% implemented yet, I saw people already verifying the patches and would expect this to be working, so if yes, this seems like a bug.

This feature should be working in all cases, and if not there may be a
bug. I responded to your off-list email before seeing this one. I'll
repeat what I said there and let's continue this discussion on the list.

I see nothing obviously wrong with what you're doing, given the
information above. To further debug this, would you be able to send a
log of the serial output when the GRUB envvar debug is set to "all"
while running the cryptomount command? If so, please send compressed in
a reply to this email on the list.

If you can't because of hardware issues, would you be able to replicate
this in QEMU and grab the serial output from there? If you can boot the
system via other means, you should be able to use the raw disks (the
one with the LUKS volume and the other with the filesystem containing
the header file).

Glenn


_______________________________________________
Grub-devel mailing list
Grub-devel@gnu.org
https://lists.gnu.org/mailman/listinfo/grub-devel


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^ permalink raw reply	[flat|nested] 25+ messages in thread
* [PATCH v3 0/3] Cryptomount detached headers
@ 2022-07-29 18:56 brutser
  2022-07-29 19:27 ` Glenn Washburn
  2022-07-30  6:51 ` Maxim Fomin
  0 siblings, 2 replies; 25+ messages in thread
From: brutser @ 2022-07-29 18:56 UTC (permalink / raw)
  To: grub-devel; +Cc: dkiper, development, ps

[-- Attachment #1: Type: text/plain, Size: 981 bytes --]


testing detached header failed:



1. built grub payload with following modules: ahci usb_keyboard part_msdos part_gpt at_keyboard cbfs cryptodisk luks2 lvm gcry_rijndael gcry_sha1 gcry_sha256 gcry_sha512

2. encrypt a partition: cryptsetup luksFormat --type luks2 -q -h sha512 -s 512 --pbkdf pbkdf2 --header /path/to/header --luks2-metadata-size=16k --luks2-keyslots-size=512k /dev/sda1

(where --luks2-metadata-size=16k --luks2-keyslots-size=512k is optional, this is just to minimize header size, but I also tested without).

3. from the grub cmd, i try to decrypt this partition using: cryptomount -H /path/to/header (ahci0,msdos1)



4. I also tried luks1 encryption with detached header.



whatever I try, I always get the same error:

"no cryptodisk module can handle this device"



Is this feature not 100% implemented yet, I saw people already verifying the patches and would expect this to be working, so if yes, this seems like a bug.




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^ permalink raw reply	[flat|nested] 25+ messages in thread
* [PATCH v3 0/3] Cryptomount detached headers
@ 2022-06-08 15:34 Glenn Washburn
  2022-06-09 16:58 ` Daniel Kiper
  0 siblings, 1 reply; 25+ messages in thread
From: Glenn Washburn @ 2022-06-08 15:34 UTC (permalink / raw)
  To: grub-devel, Daniel Kiper
  Cc: Denis 'GNUtoo' Carikli, Patrick Steinhardt, John Lane,
	Glenn Washburn

Updates since v2:
 * Address uneeded ret variable pointed out by Patrick
 * Rebased onto latest master with keyfile and security changes. I don't think
   this actually changed these patches though.

Conceptually the approach is different than the previous detach header
series because this one uses the disk objects read hook to hook reads to
the disk in scan() and recover_key() such that if there is an associated
header file, the hook will cause the read to return data from the header
file instead of from the source disk.

For this the read hook implementation needed to be upgaded because prior
it didn't get the read buffer sent from the read caller and so could not
modify its contents. Patch #1 updates the hook accordingly and all instances
of its use, but doesn't functionally change how GRUB operates.

The second patch adds the header option to cryptomount and the read hook
to the source disk during the scan() and recover_key() stages.
The benefit of this approach is its simpler/less code and does not require
the modification of backends, except to potentially cause a failure in
scan() if the backend doesn't support the current implementation of detached
headers, as with the GELI backend. This implementation requires that the
crypto volume header reside at the beginning of the volume. GELI has its
header at the end, which is why it can not currently be supported. In
theory, GELI could be supported if extra assumptions about its source
access pattern during scan() and recovery_key() were made. I don't use GELI,
no one seems to be asking for GELI detached headers, and I don't think that
GELI even support detached headers with the official tools. So for me, not
supporting crypto volumes with headers at the end of the disk is not a big
deal. With the patch series each backend gets the header file through cargs,
so it can implement detached headers by solely operating on that file instead
of the hooked source disk. In the the future, a flag can be added to the
cryptodisk_dev_t that backends can sent when registering to enabled/disable
the use of the read hook, if the backend needs to read from both the detached
header file and the source disk.

Glenn

Glenn Washburn (3):
  disk: Allow read hook callback to take read buffer to potentially
    modify it
  cryptodisk: Add support for using detached header files
  docs: Add documentation on detached header option to cryptomount

 docs/grub.texi                 | 13 +++--
 grub-core/commands/blocklist.c | 10 ++--
 grub-core/commands/loadenv.c   |  8 +--
 grub-core/commands/testload.c  |  4 +-
 grub-core/disk/cryptodisk.c    | 92 ++++++++++++++++++++++++++++++++--
 grub-core/disk/geli.c          |  4 ++
 grub-core/fs/hfspluscomp.c     |  4 +-
 grub-core/fs/ntfscomp.c        | 14 +++---
 grub-core/kern/disk.c          | 12 ++---
 grub-core/lib/progress.c       | 11 ++--
 grub-core/net/net.c            |  2 +-
 include/grub/cryptodisk.h      |  2 +
 include/grub/disk.h            |  6 +--
 include/grub/file.h            |  2 +
 14 files changed, 146 insertions(+), 38 deletions(-)

Range-diff against v2:
1:  91fa9a8eb ! 1:  a74dfb620 disk: Allow read hook callback to take read buffer to potentially modify it
    @@ Commit message
         hook. Also changed is that now when the read hook callback is called it can
         also indicate what error code should be sent back to the read caller.
     
    +    Signed-off-by: Glenn Washburn <development@efficientek.com>
    +    Reviewed-by: Patrick Steinhardt <ps@pks.im>
    +
      ## grub-core/commands/blocklist.c ##
     @@ grub-core/commands/blocklist.c: print_blocklist (grub_disk_addr_t sector, unsigned num,
      }
2:  f16d0a8b0 ! 2:  39bbab75c cryptodisk: Add support for using detached header files
    @@ Commit message
         Also add a --header (short -H) option to cryptomount which takes a file
         argument.
     
    +    Signed-off-by: Glenn Washburn <development@efficientek.com>
    +    Reviewed-by: Patrick Steinhardt <ps@pks.im>
    +
      ## grub-core/disk/cryptodisk.c ##
     @@ grub-core/disk/cryptodisk.c: enum
          OPTION_PASSWORD,
    @@ grub-core/disk/cryptodisk.c: cryptodisk_close (grub_cryptodisk_t dev)
     +cryptodisk_read_hook (grub_disk_addr_t sector, unsigned offset,
     +		      unsigned length, char *buf, void *data)
     +{
    -+  grub_err_t ret = GRUB_ERR_NONE;
     +  cryptodisk_read_hook_ctx_t ctx = data;
     +
     +  if (ctx->hdr_file == NULL)
    @@ grub-core/disk/cryptodisk.c: cryptodisk_close (grub_cryptodisk_t dev)
     +      return grub_errno;
     +    }
     +
    -+  return ret;
    ++  return GRUB_ERR_NONE;
     +}
     +
      static grub_cryptodisk_t
    @@ include/grub/cryptodisk.h: struct grub_cryptomount_args
      ## include/grub/file.h ##
     @@ include/grub/file.h: enum grub_file_type
          GRUB_FILE_TYPE_ZFS_ENCRYPTION_KEY,
    -     /* File holding the encryption key */
    +     /* File holding the encryption key. */
          GRUB_FILE_TYPE_CRYPTODISK_ENCRYPTION_KEY,
     +    /* File holding the encryption metadata header */
     +    GRUB_FILE_TYPE_CRYPTODISK_DETACHED_HEADER,
3:  f13a6e840 ! 3:  2deb90d33 docs: Add documentation on detached header option to cryptomount
    @@ Metadata
      ## Commit message ##
         docs: Add documentation on detached header option to cryptomount
     
    +    Signed-off-by: Glenn Washburn <development@efficientek.com>
    +    Reviewed-by: Patrick Steinhardt <ps@pks.im>
    +
      ## docs/grub.texi ##
     @@ docs/grub.texi: Alias for @code{hashsum --hash crc32 arg @dots{}}. See command @command{hashsum}
      @node cryptomount
-- 
2.34.1



^ permalink raw reply	[flat|nested] 25+ messages in thread
end of thread, other threads:[~2022-08-05 17:10 UTC | newest]

Thread overview: 25+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-07-30  9:54 [PATCH v3 0/3] Cryptomount detached headers brutser
2022-07-30 18:48 ` brutser
2022-08-01 22:49   ` Glenn Washburn
2022-08-01 20:50 ` Glenn Washburn
2022-08-01 22:21   ` brutser
2022-08-01 23:24     ` Glenn Washburn
  -- strict thread matches above, loose matches on Subject: below --
2022-08-04 16:56 brutser
2022-08-05  5:00 ` Glenn Washburn
2022-08-05  9:43   ` brutser
2022-08-05 17:10     ` Glenn Washburn
2022-08-04 16:24 brutser
2022-08-03 23:54 brutser
2022-08-01 23:47 brutser
2022-08-02  0:26 ` brutser
2022-08-02 18:58   ` Glenn Washburn
2022-08-02 20:49     ` brutser
2022-08-03 19:54       ` Glenn Washburn
2022-08-03 22:26         ` brutser
2022-07-29 20:01 brutser
2022-07-29 18:56 brutser
2022-07-29 19:27 ` Glenn Washburn
2022-07-30  6:51 ` Maxim Fomin
2022-07-30  9:20   ` brutser
2022-06-08 15:34 Glenn Washburn
2022-06-09 16:58 ` Daniel Kiper

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