systemd-sbsign — Sign PE binaries for EFI Secure Boot
systemd-sbsign [OPTIONS...] {COMMAND}
sign¶Signs the given PE binary for EFI Secure Boot. Takes a path to a PE binary as its
argument. If the PE binary already has a certificate table, the new signature will be added to it.
Otherwise, a new certificate table will be created. The signed PE binary will be written to the path
specified with --output=.
The following options are understood:
--output=PATH¶Specifies the path where to write the signed PE binary or the data to be signed
offline when using the --prepare-offline-signing option.
--private-key=PATH/URI, --private-key-source=TYPE[:NAME], --certificate=PATH, --certificate-source=TYPE[:NAME]¶Set the Secure Boot private key and certificate for use with the
sign verb. The --certificate= option takes a path to a
PEM-encoded X.509 certificate or a URI that's passed to the OpenSSL provider configured with
--certificate-source. The --certificate-source option takes one of
"file" or "provider", with the latter being followed by a specific
provider identifier, separated with a colon, e.g. "provider:pkcs11". The
--private-key= option takes a path or a URI that will be passed to the OpenSSL
engine or provider, as specified by --private-key-source= as a
"type:name" tuple, such as "engine:pkcs11". The specified OpenSSL
signing engine or provider will be used to sign the PE binary.
--prepare-offline-signing¶When this option is specified, the sign command writes the data
that should be signed to the path specified with --output= instead of writing the
signed PE binary. This data can then be signed out of band after which the signature can be attached
to the PE binary using the --signed-data= and
--signed-data-signature= options.
--signed-data=PATH, --signed-data-signature=PATH¶Configure the signed data (as written to the path specified with
--output= when using the --prepare-offline-signing option) and
corresponding signature for the sign command.
-h, --help¶--version¶Example 1. Offline EFI secure boot signing of a PE binary
The following does offline secure boot signing of systemd-boot:
SD_BOOT="$(find /usr/lib/systemd/boot/efi/ -name "systemd-boot*.efi" | head -n1)"
# Extract the data that should be signed offline.
/usr/lib/systemd/systemd-sbsign \
sign \
--certificate=secure-boot-certificate.pem \
--output=signed-data.bin \
--prepare-offline-signing \
"$SD_BOOT"
# Sign the data out-of-band. This step usually happens out-of-band on a separate system.
openssl dgst -sha256 -sign secure-boot-private-key.pem -out signed-data.sig signed-data.bin
# Attach the signed data and its signature to the systemd-boot PE binary.
/usr/lib/systemd/systemd-sbsign \
sign \
--certificate=secure-boot-certificate.pem \
--output="$SD_BOOT.signed" \
--signed-data=signed-data.bin \
--signed-data-signature=signed-data.sig \
"$SD_BOOT"