[PATCH v3 07/13] meta-arm: Introduce gen-uefi-sb-keys.bb recipe

[Javier Tia <javier.tia@linaro.org>]

Generate a new set of keys on build time. It avoids to use same keys
which could generate a security issue.

Signed-off-by: Javier Tia <javier.tia@linaro.org>
---
 meta-arm/recipes-bsp/uefi/gen-uefi-sb-keys.bb | 26 +++++++++
 meta-arm/uefi-sb-keys/.gitignore              |  4 ++
 meta-arm/uefi-sb-keys/gen_uefi_keys.sh        | 56 +++++++++----------
 3 files changed, 57 insertions(+), 29 deletions(-)
 create mode 100644 meta-arm/recipes-bsp/uefi/gen-uefi-sb-keys.bb
 create mode 100644 meta-arm/uefi-sb-keys/.gitignore

diff --git a/meta-arm/recipes-bsp/uefi/gen-uefi-sb-keys.bb b/meta-arm/recipes-bsp/uefi/gen-uefi-sb-keys.bb
new file mode 100644
index 00000000..a4ae6d87
--- /dev/null
+++ b/meta-arm/recipes-bsp/uefi/gen-uefi-sb-keys.bb
@@ -0,0 +1,26 @@
+# SPDX-License-Identifier: MIT
+
+SUMMARY = "Generate UEFI keys for secure boot"
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"
+
+DEPENDS += "bash-native"
+DEPENDS += "coreutils-native"
+DEPENDS += "efitools-native"
+DEPENDS += "openssl-native"
+
+SRC_URI = "file://${UEFI_SB_KEYS_DIR}/gen_uefi_keys.sh"
+
+UNPACKDIR = "${S}"
+
+do_fetch[noexec] = "1"
+do_patch[noexec] = "1"
+do_compile[noexec] = "1"
+do_configure[noexec] = "1"
+
+do_install() {
+    ${UEFI_SB_KEYS_DIR}/gen_uefi_keys.sh ${UEFI_SB_KEYS_DIR}
+}
+
+FILES:${PN} = "${UEFI_SB_KEYS_DIR}/*.key"
+FILES:${PN} += "${UEFI_SB_KEYS_DIR}/*.crt"
diff --git a/meta-arm/uefi-sb-keys/.gitignore b/meta-arm/uefi-sb-keys/.gitignore
new file mode 100644
index 00000000..f8669919
--- /dev/null
+++ b/meta-arm/uefi-sb-keys/.gitignore
@@ -0,0 +1,4 @@
+*.auth
+*.crt
+*.esl
+*.key
\ No newline at end of file
diff --git a/meta-arm/uefi-sb-keys/gen_uefi_keys.sh b/meta-arm/uefi-sb-keys/gen_uefi_keys.sh
index fc7f25c9..21e65c72 100755
--- a/meta-arm/uefi-sb-keys/gen_uefi_keys.sh
+++ b/meta-arm/uefi-sb-keys/gen_uefi_keys.sh
@@ -1,35 +1,33 @@
-#/bin/sh
+#!/bin/bash
+#
+# SPDX-License-Identifier: MIT
+#
 
 set -eux
 
-#Create PK
-openssl req -x509 -sha256 -newkey rsa:2048 -subj /CN=Linaro_LEDGE/ -keyout PK.key -out PK.crt -nodes -days 3650
-cert-to-efi-sig-list -g 11111111-2222-3333-4444-123456789abc PK.crt PK.esl
-sign-efi-sig-list -c PK.crt -k PK.key PK PK.esl PK.auth
+KEYS_PATH=${1:-./}
+SUBJECT="/CN=Linaro_LEDGE/"
+GUID="11111111-2222-3333-4444-123456789abc"
 
-#Create KEK
-openssl req -x509 -sha256 -newkey rsa:2048 -subj /CN=Linaro_LEDGE/ -keyout KEK.key -out KEK.crt -nodes -days 3650
-cert-to-efi-sig-list -g 11111111-2222-3333-4444-123456789abc KEK.crt KEK.esl
-sign-efi-sig-list -c PK.crt -k PK.key KEK KEK.esl KEK.auth
+openssl req -x509 -sha256 -newkey rsa:2048 -subj "${SUBJECT}" \
+    -keyout "${KEYS_PATH}"/PK.key -out "${KEYS_PATH}"/PK.crt \
+    -nodes -days 3650
+cert-to-efi-sig-list -g ${GUID} \
+    "${KEYS_PATH}"/PK.crt "${KEYS_PATH}"/PK.esl
+sign-efi-sig-list -c "${KEYS_PATH}"/PK.crt -k "${KEYS_PATH}"/PK.key \
+    "${KEYS_PATH}"/PK "${KEYS_PATH}"/PK.esl "${KEYS_PATH}"/PK.auth
 
-#Create DB
-openssl req -x509 -sha256 -newkey rsa:2048 -subj /CN=Linaro_LEDGE/ -keyout db.key -out db.crt -nodes -days 3650
-cert-to-efi-sig-list -g 11111111-2222-3333-4444-123456789abc db.crt db.esl
-sign-efi-sig-list -c KEK.crt -k KEK.key db db.esl db.auth
-
-#Create DBX
-openssl req -x509 -sha256 -newkey rsa:2048 -subj /CN=Linaro_LEDGE/ -keyout dbx.key -out dbx.crt -nodes -days 3650
-cert-to-efi-sig-list -g 11111111-2222-3333-4444-123456789abc dbx.crt dbx.esl
-sign-efi-sig-list -c KEK.crt -k KEK.key dbx dbx.esl dbx.auth
-
-#Sign image
-#sbsign --key db.key --cert db.crt Image
-
-#Digest image
-#hash-to-efi-sig-list Image db_Image.hash
-#sign-efi-sig-list -c KEK.crt -k KEK.key db db_Image.hash db_Image.auth
-
-#Empty cert for testing
-touch noPK.esl
-sign-efi-sig-list -c PK.crt -k PK.key PK noPK.esl noPK.auth
+for key in KEK db dbx; do
+    openssl req -x509 -sha256 -newkey rsa:2048 -subj "${SUBJECT}" \
+        -keyout "${KEYS_PATH}"/${key}.key -out "${KEYS_PATH}"/${key}.crt \
+        -nodes -days 3650
+    cert-to-efi-sig-list -g ${GUID} \
+        "${KEYS_PATH}"/${key}.crt "${KEYS_PATH}"/${key}.esl
+    sign-efi-sig-list -c "${KEYS_PATH}"/PK.crt -k "${KEYS_PATH}"/PK.key \
+        "${KEYS_PATH}"/${key} "${KEYS_PATH}"/${key}.esl "${KEYS_PATH}"/${key}.auth
+done
 
+# Empty cert for testing
+touch "${KEYS_PATH}"/noPK.esl
+sign-efi-sig-list -c "${KEYS_PATH}"/PK.crt -k "${KEYS_PATH}"/PK.key \
+    "${KEYS_PATH}"/PK "${KEYS_PATH}"/noPK.esl "${KEYS_PATH}"/noPK.auth
-- 
2.46.0