secure boot - dbx.esl no such file to move

[robertkwild]

hi all,

im following this guide

https://forums.fogproject.org/topic/15888/imaging-with-fog-and-secure-boot-poc/3

but getting stuck at below

mv dbx.esl dbx-fog.esl
mv: cannot stat 'dbx.esl': No such file or directory
root@rkw-Venue-11-Pro-7140:/opt/fog/secureboot/efitools# ls
cert-to-efi-hash-list    DB2-pkupdate.auth       efi-updatevar           hw_db.esl                KeyTool-signed.efi     ms-kek.crt                   PK.esl                  ShimReplace-signed.efi
cert-to-efi-hash-list.c  DB2-update.auth         efi-updatevar.c         hw_dbx.esl               KeyTool.so             ms-kek-hash-blacklist.auth   PK.h                    ShimReplace.so
cert-to-efi-hash-list.o  DB.auth                 efi-updatevar.o         hw_KEK.esl               lib                    ms-kek-pkupdate.auth         PK-hash-blacklist.auth  sig-list-to-certs
cert-to-efi-sig-list     DB-blacklist.auth       flash-var               hw_PK.esl                Loader.c               ms-kek-update.auth           PK.key                  sig-list-to-certs.c
cert-to-efi-sig-list.c   DB.cer                  flash-var.c             include                  Loader.efi             ms-uefi.auth                 PK-pkupdate.auth        sig-list-to-certs.o
cert-to-efi-sig-list.o   DB.crt                  flash-var.o             KEK.auth                 Loader-signed.efi      ms-uefi-blacklist.auth       PK-update.auth          sign-efi-sig-list
COPYING                  DB-fog.esl              hash-to-efi-sig-list    KEK-blacklist.auth       Loader.so              ms-uefi.crt                  PreLoader.c             sign-efi-sig-list.c
DB1.auth                 DB.h                    hash-to-efi-sig-list.c  KEK.cer                  LockDown.c             ms-uefi-hash-blacklist.auth  README                  sign-efi-sig-list.o
DB1-blacklist.auth       DB-hash-blacklist.auth  hash-to-efi-sig-list.o  KEK.crt                  LockDown.efi           ms-uefi-pkupdate.auth        ReadVars.c              UpdateVars.c
DB1-hash-blacklist.auth  DB.key                  HashTool.c              KEK-fog.esl              LockDown.o             ms-uefi-update.auth          ReadVars.efi            UpdateVars.efi
DB1.key                  DB-pkupdate.auth        HashTool.efi            KEK.h                    LockDown-signed.efi    myGUID.txt                   ReadVars-signed.efi     UpdateVars-signed.efi
DB1-pkupdate.auth        DB-update.auth          HashTool-signed.efi     KEK-hash-blacklist.auth  LockDown.so            noPK.auth                    ReadVars.so             UpdateVars.so
DB1-update.auth          doc                     HashTool.so             KEK.key                  Makefile               noPK.esl                     SetNull.c               xxdi.pl
DB2.auth                 efi-keytool.c           HelloWorld.c            KEK-pkupdate.auth        Make.rules             PK.auth                      SetNull.efi
DB2-blacklist.auth       efi-readvar             HelloWorld.efi          KEK-update.auth          mkusb.sh               PK-blacklist.auth            SetNull-signed.efi
DB2-hash-blacklist.auth  efi-readvar.c           HelloWorld-signed.efi   KeyTool.c                ms-kek.auth            PK.cer                       ShimReplace.c
DB2.key                  efi-readvar.o           HelloWorld.so           KeyTool.efi              ms-kek-blacklist.auth  PK.crt                       ShimReplace.efi
root@rkw-Venue-11-Pro-7140:/opt/fog/secureboot/efitools#

can i manually put a dbx.esl in there, if so has anyone got the file i could drop in here

thanks,
rob

[george1421]

@robertkwild Since you didn’t reference a step I can only guess at the answer.

But the dbx.esl is created on this post Preparing the FOG server with the prerequisites

More specifically is a copy of the dbx file you exported out of hardware in this section

sudo efi-readvar -v dbx -o /opt/fog/secureboot/hwkeys/hw_dbx.esl 

dbx.esl is also created when you run these commands

cd /opt/fog/secureboot/efitools
make

This is when you first compile the efitools programs
Then we rename the first compiled version with this command because we don’t need it in the finished product. We’ll use the hw one that was downloaded from the firmware.

mv dbx.esl dbx-fog.esl

And then finally we take the firmware hw_dbx.esl file and copy it over to the dbx.esl file name.

cat hw_dbx.esl > dbx.esl

Depending on where you are getting the error I think you missed a step. The dbx.esl file contains any certificates that have been revoked. When you compile the file signing keys the default microsoft dbx.esl file is good enough.

[robertkwild]

@george1421

sudo efi-readvar -v dbx -o /opt/fog/secureboot/hwkeys/hw_dbx.esl

I did run this command and then I moved it to this dir as you can see from my previous post when I ran the ls command

I did run the make command in the efitools dir but as you can see it’s not here as I’ve done an ls command and it’s not listed

I can’t mv dbx.esl as it’s not there to move

I can however cp hw_dbx.esl and rename the copy dbx.esl so I do have a dbx.esl file, do I have to do this?

Thanks
Rob

[george1421]

@robertkwild said in secure boot - dbx.esl no such file to move:

I can’t mv dbx.esl as it’s not there to move

So if after you compile efitools and the dbx.esl doesn’t exist that is OK since you will be replacing it with the exported hw_dbx.esl key. So its all good

[robertkwild]

@george1421 thank you george very much

im doing this on another laptop with secure boot on and then il transfer the files to my fog server that way

is the below file the only file i need from the laptop, or do i need these two files aswell

/opt/fog/secureboot/efitools/EnrollKeys.efi

/opt/fog/secureboot/efikeys/DB.crt
/opt/fog/secureboot/efikeys/DB.key

thanks,
rob

[george1421]

@robertkwild If you are going to let EnrollKeys.efi update your PC then that is the only thing you need for pxe booting

You need to sign ipxe.efi and bzImage using the other keys. But that all stays on the FOG server.

[robertkwild]

@george1421 thanks

also im using as the boot file name “snp.efi” is that a problem

[george1421]

@robertkwild said in secure boot - dbx.esl no such file to move:

boot file name “snp.efi”

Not a problem as long as you sign that file too. Any efi file you want to boot needs to be signed with the matching certificate in firmware.

[robertkwild]

@george1421 so your saying

mv /tftpboot/ipxe.efi /tftpboot/ipxe-unsigned.efi
sbsign --key /opt/fog/secureboot/efikeys/DB.key --cert /opt/fog/secureboot/efikeys/DB.crt --output /tftpboot/ipxe.efi /tftpboot/ipxe-unsigned.efi

i could all instances of “ipxe.efi” with any one of these

intel.efi
ipxe.efi
realtek.efi
snp.efi
snponly.efi

thanks,
rob

[robertkwild]

@george1421 i get this error

[george1421]

@robertkwild What does your parameter block look for this menu item?

It should be similar to this if the error was generated when applying the enrollkeys.efi program.

chain tftp:/${fog-ip}/EnrollKeys.efi
echo Rebooting the system in 8 seconds
sleep 5
reboot

[robertkwild]

@george1421 thanks George il check my params for the enroll key entry

Just out of interest as I’m making the enrollkeys.efi using another laptop which has a more recent UEFI and secure boot keys, I know I need to export it to my fog server but what about dB.crt and dB.key, do I need to export these aswell to the fog server or can I use the ones already on there on the fog server?

This is because I have followed this howto on both systems, so I have 2 sets of crt and key files one on the fog server and one on the laptop

/opt/fog/secureboot/efitools/EnrollKeys.efi
/opt/fog/secureboot/efikeys/DB.crt
/opt/fog/secureboot/efikeys/DB.key

[robertkwild]

@george1421 made it into all one script, even the mkkeys.sh

#!/bin/bash

apt-get update
apt-get upgrade -y

apt-get install -y openssl efitools gnu-efi git build-essential help2man libssl-dev
perl -e'use CPAN; install "File::Slurp"'

mkdir -p /opt/fog/secureboot/efikeys

cat << EOF > /opt/fog/secureboot/mkkeys.sh
#!/bin/bash
# Copyright (c) 2015 by Roderick W. Smith
# Updated 26-Nov-2021 by George1421 for the FOG Project
# Licensed under the terms of the GPL v3

NAME=FOGProjectSB

openssl req -new -x509 -newkey rsa:2048 -subj "/CN=$NAME PK/" -keyout efikeys/PK.key \
        -out efikeys/PK.crt -days 3650 -nodes -sha256
openssl req -new -x509 -newkey rsa:2048 -subj "/CN=$NAME KEK/" -keyout efikeys/KEK.key \
        -out efikeys/KEK.crt -days 3650 -nodes -sha256
openssl req -new -x509 -newkey rsa:2048 -subj "/CN=$NAME DB/" -keyout efikeys/DB.key \
        -out efikeys/DB.crt -days 3650 -nodes -sha256
openssl x509 -in efikeys/PK.crt -out efikeys/PK.cer -outform DER
openssl x509 -in efikeys/KEK.crt -out efikeys/KEK.cer -outform DER
openssl x509 -in efikeys/DB.crt -out efikeys/DB.cer -outform DER

GUID=`python3 -c 'import uuid; print(str(uuid.uuid1()))'`
echo $GUID > efikeys/myGUID.txt

cert-to-efi-sig-list -g $GUID efikeys/PK.crt efikeys/PK.esl
cert-to-efi-sig-list -g $GUID efikeys/KEK.crt efikeys/KEK.esl
cert-to-efi-sig-list -g $GUID efikeys/DB.crt efikeys/DB.esl
rm -f efikeys/noPK.esl
touch efikeys/noPK.esl

sign-efi-sig-list -t "$(date --date='1 second' +'%Y-%m-%d %H:%M:%S')" \
                  -k efikeys/PK.key -c efikeys/PK.crt PK efikeys/PK.esl efikeys/PK.auth
sign-efi-sig-list -t "$(date --date='1 second' +'%Y-%m-%d %H:%M:%S')" \
                  -k efikeys/PK.key -c efikeys/PK.crt PK efikeys/noPK.esl efikeys/noPK.auth
sign-efi-sig-list -t "$(date --date='1 second' +'%Y-%m-%d %H:%M:%S')" \
                  -k efikeys/PK.key -c efikeys/PK.crt KEK efikeys/KEK.esl efikeys/KEK.auth
sign-efi-sig-list -t "$(date --date='1 second' +'%Y-%m-%d %H:%M:%S')" \
                  -k efikeys/KEK.key -c efikeys/KEK.crt db efikeys/DB.esl efikeys/DB.auth

chmod 0600 efikeys/*.key

echo ""
echo ""
echo "For use with KeyTool, copy the *.auth and *.esl files to a FAT USB"
echo "flash drive or to your EFI System Partition (ESP)."
echo "For use with most UEFIs' built-in key managers, copy the *.cer files;"
echo "but some UEFIs require the *.auth files."
echo ""
EOF

chmod a+x /opt/fog/secureboot/mkkeys.sh
cd /opt/fog/secureboot/
./mkkeys.sh

git clone git://git.kernel.org/pub/scm/linux/kernel/git/jejb/efitools.git

cd /opt/fog/secureboot/efitools
make

mkdir -p /opt/fog/secureboot/hwkeys
cd /opt/fog/secureboot/

efi-readvar -v PK -o /opt/fog/secureboot/hwkeys/hw_PK.esl
efi-readvar -v KEK -o /opt/fog/secureboot/hwkeys/hw_KEK.esl
efi-readvar -v db -o /opt/fog/secureboot/hwkeys/hw_db.esl
efi-readvar -v dbx -o /opt/fog/secureboot/hwkeys/hw_dbx.esl
chmod 666 /opt/fog/secureboot/hwkeys/*

cp /opt/fog/secureboot/efikeys/* /opt/fog/secureboot/efitools/
cp /opt/fog/secureboot/hwkeys/* /opt/fog/secureboot/efitools/
cd /opt/fog/secureboot/efitools

cat hw_db.esl > DB.esl
cat hw_KEK.esl > KEK.esl
cat hw_dbx.esl > dbx.esl

rm LockDown*efi LockDown.so LockDown.o
make

cp LockDown-signed.efi EnrollKeys.efi

mkdir -p /tftpboot

cp /opt/fog/secureboot/efitools/EnrollKeys.efi /tftpboot

mv /var/www/html/fog/service/ipxe/bzImage /var/www/html/fog/service/ipxe/bzImage-unsigned
sbsign --key /opt/fog/secureboot/efikeys/DB.key --cert /opt/fog/secureboot/efikeys/DB.crt --output /var/www/html/fog/service/ipxe/bzImage /var/www/html/fog/service/ipxe/bzImage-unsigned

mv /var/www/html/fog/service/ipxe/bzImage32 /var/www/html/fog/service/ipxe/bzImage32-unsigned
sbsign --key /opt/fog/secureboot/efikeys/DB.key --cert /opt/fog/secureboot/efikeys/DB.crt --output /var/www/html/fog/service/ipxe/bzImage32 /var/www/html/fog/service/ipxe/bzImage32-unsigned

mv /var/www/html/fog/service/ipxe/refind.efi /var/www/html/fog/service/ipxe/refind-unsigned.efi
sbsign --key /opt/fog/secureboot/efikeys/DB.key --cert /opt/fog/secureboot/efikeys/DB.crt --output /var/www/html/fog/service/ipxe/refind.efi /var/www/html/fog/service/ipxe/refind-unsigned.efi


mv /tftpboot/ipxe.efi /tftpboot/ipxe-unsigned.efi
sbsign --key /opt/fog/secureboot/efikeys/DB.key --cert /opt/fog/secureboot/efikeys/DB.crt --output /tftpboot/ipxe.efi /tftpboot/ipxe-unsigned.efi

mv /tftpboot/snponly.efi /tftpboot/snponly-unsigned.efi
sbsign --key /opt/fog/secureboot/efikeys/DB.key --cert /opt/fog/secureboot/efikeys/DB.crt --output /tftpboot/snponly.efi /tftpboot/snponly-unsigned.efi

mv /tftpboot/snp.efi /tftpboot/snp-unsigned.efi
sbsign --key /opt/fog/secureboot/efikeys/DB.key --cert /opt/fog/secureboot/efikeys/DB.crt --output /tftpboot/snp.efi /tftpboot/snp-unsigned.efi