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57 lines
1.6 KiB
Bash
57 lines
1.6 KiB
Bash
#!/bin/bash
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# Copyright 2021 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# This script will check the signature for the BMC image against
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# the baked in keyring available. If any aspect of this fails,
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# the scripts returns non-zero and this can be reported to the
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# host.
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#
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# 1. Verify the image
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# 2. Rename the image
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SIGNATURE_FILE=/tmp/bmc.sig
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STATUS_FILE=/tmp/bmc.verify
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# Store in /run/initramfs because the behaviour of mv changes
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# depending on whether the file is moving within a tree or not.
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IMAGE_FILE=/run/initramfs/bmc-image
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VERIFIED_FILE=/run/initramfs/image-bmc
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# Make sure we run ERR traps when a function returns an error
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set -e
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# Write out the result of the script to a status file upon exiting
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# normally or due to an error
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exit_handler() {
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local status="$?"
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if (( status == 0 )); then
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echo "success" >"${STATUS_FILE}"
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else
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echo "failed" >"${STATUS_FILE}"
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fi
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trap - EXIT ERR
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exit "$status"
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}
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trap exit_handler EXIT ERR
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echo "running" > ${STATUS_FILE}
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# Verify the image.
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verify-bmc-image.sh @ALLOW_DEV@ "$IMAGE_FILE" "$SIGNATURE_FILE" || exit
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# Rename the staged file for initramfs updates.
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mv ${IMAGE_FILE} ${VERIFIED_FILE}
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