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trustfence: split ccmp13 passwords in 8 files and set SWUPDATE keys 

For signing SWU files we need to set a couple of variables:
 - SWUPDATE_PRIVATE_KEY_TEMPLATE to the private key file
 - SWUPDATE_PASSWORD_FILE to the password of the private key

The latter must only contain one password, whereas the current key_pass.txt
file had (for the ccmp13) the eight keys separated by a white space.

This commit:
 - If the file key_pass.txt exists, it extracts each key into a separate
   file key_pass0X.txt.
 - If the keys don't exist, generates separate files per key.
 - Changes the permissions of password files to 400.
 - Adapts the sign script to use the single password files.
 - Fixes a few quotes

Signed-off-by: Hector Palacios <hector.palacios@digi.com>
This commit is contained in:
Hector Palacios 2023-12-22 08:56:00 +01:00 committed by Mike Engel
parent 161c66f5f6
commit 4f33afcbcf
3 changed files with 37 additions and 17 deletions
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36
meta-digi-arm/recipes-digi/trustfence/trustfence-sign-tools/trustfence-gen-pki-stm.sh
View File

@ -53,14 +53,16 @@ fi
[ -d "${CONFIG_SIGN_KEYS_PATH}" ] || mkdir "${CONFIG_SIGN_KEYS_PATH}"
# Default values
KEY_PASS_FILE="${CONFIG_SIGN_KEYS_PATH}/keys/key_pass.txt"
KEY_PASS_BASEFILE="${CONFIG_SIGN_KEYS_PATH}/keys/key_pass"
KEY_PASS_FILE="${KEY_PASS_BASEFILE}.txt"
# Generate random keys if they don't exist
N_PUBK="$(ls -l "${CONFIG_SIGN_KEYS_PATH}"/keys/publicKey*.pem 2>/dev/null | wc -l)"
N_PRVK="$(ls -l "${CONFIG_SIGN_KEYS_PATH}"/keys/privateKey*.pem 2>/dev/null | wc -l)"
N_PUBK="$(ls -l ${CONFIG_SIGN_KEYS_PATH}/keys/publicKey*.pem 2>/dev/null | wc -l)"
N_PRVK="$(ls -l ${CONFIG_SIGN_KEYS_PATH}/keys/privateKey*.pem 2>/dev/null | wc -l)"
N_PASS="$(ls -l ${KEY_PASS_BASEFILE}*.txt 2>/dev/null | wc -l)"
install -d "${CONFIG_SIGN_KEYS_PATH}/keys/"
if [ "${PLATFORM}" = "ccmp15" ]; then
if [ "${N_PUBK}" != "1" ] && [ "${N_PRVK}" != 1 ] && [ ! -f "${KEY_PASS_FILE}" ]; then
install -d "${CONFIG_SIGN_KEYS_PATH}/keys/"
# Random password
password="$(openssl rand -base64 32)"
echo "Generating random key"
@ -69,21 +71,33 @@ if [ "${PLATFORM}" = "ccmp15" ]; then
exit 1
fi
echo "${password}" > "${KEY_PASS_FILE}"
chmod 400 "${KEY_PASS_FILE}"
fi
elif [ "${PLATFORM}" = "ccmp13" ]; then
if [ "${N_PUBK}" != "8" ] && [ "${N_PRVK}" != 8 ] && [ ! -f "${KEY_PASS_FILE}" ]; then
install -d "${CONFIG_SIGN_KEYS_PATH}/keys/"
# 8 random passwords (separated by whitespaces)
passwords="$(openssl rand -base64 32)"
for i in $(seq 1 7); do
passwords="${passwords} $(openssl rand -base64 32)"
if [ "${N_PUBK}" = "8" ] && [ "${N_PRVK}" = "8" ] && [ "${N_PASS}" != "8" ] && [ -f "${KEY_PASS_FILE}" ]; then
# Backwards compatibility: if a single key_pass.txt file exists,
# split into 8 files with one password each
for i in $(seq 0 7); do
cat "${KEY_PASS_FILE}" | cut -f $((i+1)) -d " " > "${KEY_PASS_BASEFILE}0${i}.txt"
chmod 400 "${KEY_PASS_BASEFILE}0${i}.txt"
done
elif [ "${N_PUBK}" != "8" ] && [ "${N_PRVK}" != "8" ] && [ "${N_PASS}" != "8" ]; then
# Generate 8 random passwords
for i in $(seq 0 7); do
pass="$(openssl rand -base64 32)"
echo "${pass}" > "${KEY_PASS_BASEFILE}0${i}.txt"
chmod 400 "${KEY_PASS_BASEFILE}0${i}.txt"
# Combined string with 8 passwords separated by a white space
passwords="${passwords} ${pass}"
done
echo "Generating random keys"
if ! STM32MP_KeyGen_CLI -abs "${CONFIG_SIGN_KEYS_PATH}/keys/" -pwd ${passwords} -n 8; then
echo "[ERROR] Could not generate PKI tree"
exit 1
fi
echo "${passwords}" > "${KEY_PASS_FILE}"
else
echo "[ERROR] Could not generate PKI tree. An incomplete PKI tree may already exist."
exit 1
fi
else
echo "Undefined platform"

6
meta-digi-arm/recipes-digi/trustfence/trustfence-sign-tools/trustfence-sign-artifact-stm.sh
View File

@ -62,7 +62,6 @@ fi
# Default values
[ -z "${CONFIG_KEY_INDEX}" ] && CONFIG_KEY_INDEX="0"
KEY_PASS_FILE="${CONFIG_SIGN_KEYS_PATH}/keys/key_pass.txt"
# Generate random keys if they don't exist
if ! trustfence-gen-pki.sh -p ${PLATFORM}; then
@ -70,9 +69,11 @@ if ! trustfence-gen-pki.sh -p ${PLATFORM}; then
fi
if [ "${PLATFORM}" = "ccmp15" ]; then
KEY_PASS_FILE="${CONFIG_SIGN_KEYS_PATH}/keys/key_pass.txt"
PUBLIC_KEY="${CONFIG_SIGN_KEYS_PATH}/keys/publicKey.pem"
PRIVATE_KEY="${CONFIG_SIGN_KEYS_PATH}/keys/privateKey.pem"
elif [ "${PLATFORM}" = "ccmp13" ]; then
KEY_PASS_FILE="${CONFIG_SIGN_KEYS_PATH}/keys/key_pass0${CONFIG_KEY_INDEX}.txt"
PUBLIC_KEY="${CONFIG_SIGN_KEYS_PATH}/keys/publicKey0*.pem"
PRIVATE_KEY="${CONFIG_SIGN_KEYS_PATH}/keys/privateKey0${CONFIG_KEY_INDEX}.pem"
else
@ -90,8 +91,7 @@ INPUT_FILE="$(readlink -e "${1}")"
OUTPUT_FILE="$(readlink -m "${2}")"
# Obtain password from key pass file
INDEX=$((CONFIG_KEY_INDEX + 1))
PASS=$(cat "${KEY_PASS_FILE}" | cut -f "${INDEX}" -d " ")
PASS=$(cat "${KEY_PASS_FILE}")
# Sign TF-A artifact
if [ "${ARTIFACT_TFA}" = "y" ]; then

12
meta-digi-dey/classes/trustfence.bbclass
View File

@ -242,9 +242,15 @@ python () {
else:
d.setVar("SWUPDATE_PRIVATE_KEY_TEMPLATE", keys_path + "/keys/IMG" + str(key_index_1) + "*key.pem")
d.setVar("CONFIG_SIGN_MODE", "HAB")
# Set the key password.
d.setVar("SWUPDATE_PASSWORD_FILE", keys_path + "/keys/key_pass.txt")
# Set the key password.
d.setVar("SWUPDATE_PASSWORD_FILE", keys_path + "/keys/key_pass.txt")
elif (d.getVar("DEY_SOC_VENDOR") == "STM"):
d.setVar("SWUPDATE_PRIVATE_KEY_TEMPLATE", d.getVar("FIP_SIGN_KEY"))
# Set the key password.
if (d.getVar("DIGI_SOM") == "ccmp15"):
d.setVar("SWUPDATE_PASSWORD_FILE", keys_path + "/keys/key_pass.txt")
elif (d.getVar("DIGI_SOM") == "ccmp13"):
d.setVar("SWUPDATE_PASSWORD_FILE", keys_path + "/keys/key_pass0" + str(key_index) + ".txt")
# Enable partition encryption if rootfs encryption is enabled
if (d.getVar("TRUSTFENCE_ENCRYPT_ROOTFS") == "1"):