Merge tag 'efi-2022-04-rc2-4' of https://source.denx.de/u-boot/custodians/u-boot-efi

Pull request for efi-2022-04-rc2-4

Documentation:

* mkeficapsule man-page

UEFI changes:

* add support for signing images to mkeficapsule
* add support for user define capsule GUID
* adjust unit tests for capsules
* fix UEFI image signature validation in case of multiple signatures

2 files changed, 187 insertions, 75 deletions

diff --git a/doc/develop/uefi/uefi.rst b/doc/develop/uefi/uefi.rst
index 43fb10f797..b7bf135627 100644
--- a/doc/develop/uefi/uefi.rst
+++ b/doc/develop/uefi/uefi.rst
@@ -284,37 +284,56 @@ Support has been added for the UEFI capsule update feature which
 enables updating the U-Boot image using the UEFI firmware management
 protocol (FMP). The capsules are not passed to the firmware through
 the UpdateCapsule runtime service. Instead, capsule-on-disk
-functionality is used for fetching the capsule from the EFI System
-Partition (ESP) by placing the capsule file under the
-\EFI\UpdateCapsule directory.
-
-The directory \EFI\UpdateCapsule is checked for capsules only within the
-EFI system partition on the device specified in the active boot option
-determined by reference to BootNext variable or BootOrder variable processing.
-The active Boot Variable is the variable with highest priority BootNext or
-within BootOrder that refers to a device found to be present. Boot variables
-in BootOrder but referring to devices not present are ignored when determining
-active boot variable.
-Before starting a capsule update make sure your capsules are installed in the
-correct ESP partition or set BootNext.
+functionality is used for fetching capsules from the EFI System
+Partition (ESP) by placing capsule files under the directory::
+
+    \EFI\UpdateCapsule
+
+The directory is checked for capsules only within the
+EFI system partition on the device specified in the active boot option,
+which is determined by BootXXXX variable in BootNext, or if not, the highest
+priority one within BootOrder. Any BootXXXX variables referring to devices
+not present are ignored when determining the active boot option.
+
+Please note that capsules will be applied in the alphabetic order of
+capsule file names.
+
+Creating a capsule file
+***********************
+
+A capsule file can be created by using tools/mkeficapsule.
+To build this tool, enable::
+
+    CONFIG_TOOLS_MKEFICAPSULE=y
+    CONFIG_TOOLS_LIBCRYPTO=y
+
+Run the following command
+
+.. code-block:: console
+
+    $ mkeficapsule \
+      --index 1 --instance 0 \
+      [--fit <FIT image> | --raw <raw image>] \
+      <capsule_file_name>
 
 Performing the update
 *********************
 
-Since U-boot doesn't currently support SetVariable at runtime there's a Kconfig
-option (CONFIG_EFI_IGNORE_OSINDICATIONS) to disable the OsIndications variable
-check. If that option is enabled just copy your capsule to \EFI\UpdateCapsule.
+Put capsule files under the directory mentioned above.
+Then, following the UEFI specification, you'll need to set
+the EFI_OS_INDICATIONS_FILE_CAPSULE_DELIVERY_SUPPORTED
+bit in OsIndications variable with
 
-If that option is disabled, you'll need to set the OsIndications variable with::
+.. code-block:: console
 
     => setenv -e -nv -bs -rt -v OsIndications =0x04
 
-Finally, the capsule update can be initiated either by rebooting the board,
-which is the preferred method, or by issuing the following command::
-
-    => efidebug capsule disk-update
+Since U-boot doesn't currently support SetVariable at runtime, its value
+won't be taken over across the reboot. If this is the case, you can skip
+this feature check with the Kconfig option (CONFIG_EFI_IGNORE_OSINDICATIONS)
+set.
 
-**The efidebug command is should only be used during debugging/development.**
+Finally, the capsule update can be initiated by rebooting the board.
 
 Enabling Capsule Authentication
 *******************************
@@ -324,82 +343,64 @@ be updated by verifying the capsule signature. The capsule signature
 is computed and prepended to the capsule payload at the time of
 capsule generation. This signature is then verified by using the
 public key stored as part of the X509 certificate. This certificate is
-in the form of an efi signature list (esl) file, which is embedded as
-part of U-Boot.
+in the form of an efi signature list (esl) file, which is embedded in
+a device tree.
 
 The capsule authentication feature can be enabled through the
 following config, in addition to the configs listed above for capsule
 update::
 
     CONFIG_EFI_CAPSULE_AUTHENTICATE=y
-    CONFIG_EFI_CAPSULE_KEY_PATH=<path to .esl cert>
 
 The public and private keys used for the signing process are generated
-and used by the steps highlighted below::
+and used by the steps highlighted below.
 
-    1. Install utility commands on your host
-       * OPENSSL
+1. Install utility commands on your host
+       * openssl
        * efitools
 
-    2. Create signing keys and certificate files on your host
+2. Create signing keys and certificate files on your host
 
-        $ openssl req -x509 -sha256 -newkey rsa:2048 -subj /CN=CRT/ \
-            -keyout CRT.key -out CRT.crt -nodes -days 365
-        $ cert-to-efi-sig-list CRT.crt CRT.esl
+.. code-block:: console
 
-        $ openssl x509 -in CRT.crt -out CRT.cer -outform DER
-        $ openssl x509 -inform DER -in CRT.cer -outform PEM -out CRT.pub.pem
+    $ openssl req -x509 -sha256 -newkey rsa:2048 -subj /CN=CRT/ \
+        -keyout CRT.key -out CRT.crt -nodes -days 365
+    $ cert-to-efi-sig-list CRT.crt CRT.esl
 
-        $ openssl pkcs12 -export -out CRT.pfx -inkey CRT.key -in CRT.crt
-        $ openssl pkcs12 -in CRT.pfx -nodes -out CRT.pem
+3. Run the following command to create and sign the capsule file
 
-The capsule file can be generated by using the GenerateCapsule.py
-script in EDKII::
+.. code-block:: console
 
-    $ ./BaseTools/BinWrappers/PosixLike/GenerateCapsule -e -o \
-      <capsule_file_name> --monotonic-count <val> --fw-version \
-      <val> --lsv <val> --guid \
-      e2bb9c06-70e9-4b14-97a3-5a7913176e3f --verbose \
-      --update-image-index <val> --signer-private-cert \
-      /path/to/CRT.pem --trusted-public-cert \
-      /path/to/CRT.pub.pem --other-public-cert /path/to/CRT.pub.pem \
-      <u-boot.bin>
+    $ mkeficapsule --monotonic-count 1 \
+      --private-key CRT.key \
+      --certificate CRT.crt \
+      --index 1 --instance 0 \
+      [--fit | --raw | --guid <guid-string] \
+      <image_blob> <capsule_file_name>
 
-Place the capsule generated in the above step on the EFI System
-Partition under the EFI/UpdateCapsule directory
+4. Insert the signature list into a device tree in the following format::
 
-Testing on QEMU
-***************
+    {
+            signature {
+                    capsule-key = [ <binary of signature list> ];
+            }
+            ...
+    }
 
-Currently, support has been added on the QEMU ARM64 virt platform for
-updating the U-Boot binary as a raw image when the platform is booted
-in non-secure mode, i.e. with CONFIG_TFABOOT disabled. For this
-configuration, the QEMU platform needs to be booted with
-'secure=off'. The U-Boot binary placed on the first bank of the NOR
-flash at offset 0x0. The U-Boot environment is placed on the second
-NOR flash bank at offset 0x4000000.
+You can do step-4 manually with
 
-The capsule update feature is enabled with the following configuration
-settings::
+.. code-block:: console
 
-    CONFIG_MTD=y
-    CONFIG_FLASH_CFI_MTD=y
-    CONFIG_CMD_MTDPARTS=y
-    CONFIG_CMD_DFU=y
-    CONFIG_DFU_MTD=y
-    CONFIG_PCI_INIT_R=y
-    CONFIG_EFI_CAPSULE_ON_DISK=y
-    CONFIG_EFI_CAPSULE_FIRMWARE_MANAGEMENT=y
-    CONFIG_EFI_CAPSULE_FIRMWARE=y
-    CONFIG_EFI_CAPSULE_FIRMWARE_RAW=y
+    $ dtc -@ -I dts -O dtb -o signature.dtbo signature.dts
+    $ fdtoverlay -i orig.dtb -o new.dtb -v signature.dtbo
 
-In addition, the following config needs to be disabled(QEMU ARM specific)::
+where signature.dts looks like::
 
-    CONFIG_TFABOOT
-
-The capsule file can be generated by using the tools/mkeficapsule::
-
-    $ mkeficapsule --raw <u-boot.bin> --index 1 <capsule_file_name>
+    &{/} {
+            signature {
+                    capsule-key = /incbin/("CRT.esl");
+            };
+    };
 
 Executing the boot manager
 ~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/doc/mkeficapsule.1 b/doc/mkeficapsule.1
new file mode 100644
index 0000000000..8babb27ee8
--- /dev/null
+++ b/doc/mkeficapsule.1
@@ -0,0 +1,111 @@
+.\" SPDX-License-Identifier: GPL-2.0+
+.\" Copyright (c) 2021, Linaro Limited
+.\" 		written by AKASHI Takahiro <takahiro.akashi@linaro.org>
+.TH MAEFICAPSULE 1 "May 2021"
+
+.SH NAME
+mkeficapsule \- Generate EFI capsule file for U-Boot
+
+.SH SYNOPSIS
+.B mkeficapsule
+.RI [ options "] " image-blob " " capsule-file
+
+.SH "DESCRIPTION"
+.B mkeficapsule
+command is used to create an EFI capsule file for use with the U-Boot
+EFI capsule update.
+A capsule file may contain various type of firmware blobs which
+are to be applied to the system and must be placed in the specific
+directory on the UEFI system partition.
+An update will be automatically executed at next reboot.
+
+Optionally, a capsule file can be signed with a given private key.
+In this case, the update will be authenticated by verifying the signature
+before applying.
+
+.B mkeficapsule
+takes any type of image files, including:
+.TP
+.I raw image
+format is a single binary blob of any type of firmware.
+
+.TP
+.I FIT (Flattened Image Tree) image
+format is the same as used in the new uImage format and allows for
+multiple binary blobs in a single capsule file.
+This type of image file can be generated by
+.BR mkimage .
+
+.PP
+If you want to use other types than above two, you should explicitly
+specify a guid for the FMP driver.
+
+.SH "OPTIONS"
+One of
+.BR --fit ", " --raw " or " --guid
+option must be specified.
+
+.TP
+.BR -f ", " --fit
+Indicate that the blob is a FIT image file
+
+.TP
+.BR -r ", " --raw
+Indicate that the blob is a raw image file
+
+.TP
+.BI "-g\fR,\fB --guid " guid-string
+Specify guid for image blob type. The format is:
+    xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+
+The first three elements are in little endian, while the rest
+is in big endian.
+
+.TP
+.BI "-i\fR,\fB --index " index
+Specify an image index
+
+.TP
+.BI "-I\fR,\fB --instance " instance
+Specify a hardware instance
+
+.TP
+.BR -h ", " --help
+Print a help message
+
+.PP
+With signing,
+.BR --private-key ", " --certificate " and " --monotonic-count
+are all mandatory.
+
+.TP
+.BI "-p\fR,\fB --private-key " private-key-file
+Specify signer's private key file in PEM
+
+.TP
+.BI "-c\fR,\fB --certificate " certificate-file
+Specify signer's certificate file in EFI certificate list format
+
+.TP
+.BI "-m\fR,\fB --monotonic-count " count
+Specify a monotonic count which is set to be monotonically incremented
+at every firmware update.
+
+.TP
+.B "-d\fR,\fB --dump_sig"
+Dump signature data into *.p7 file
+
+.PP
+.SH FILES
+.TP
+.I /EFI/UpdateCapsule
+The directory in which all capsule files be placed
+
+.SH SEE ALSO
+.BR mkimage (1)
+
+.SH AUTHORS
+Written by AKASHI Takahiro <takahiro.akashi@linaro.org>
+
+.SH HOMEPAGE
+http://www.denx.de/wiki/U-Boot/WebHome