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https://github.com/ibm-s390-linux/s390-tools.git
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36a7b2e6eb
Add minor improvements to the scripts the dracut module calls. Reviewed-by: Holger Dengler <dengler@linux.ibm.com> Signed-off-by: Finn Callies <fcallies@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
71 lines
1.5 KiB
Bash
71 lines
1.5 KiB
Bash
#!/bin/bash
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# SPDX-License-Identifier: MIT
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#
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# Copyright IBM Corp.
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SYSFS=/sys/firmware/uv/prot_virt_guest
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SICS=/boot/sics
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EBC_TMPFS=/run/sel-ebc
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TOC=toc.asr
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ASR_NAME=luks-rfs-passphrase
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# Early exit for non SEL guests
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if [[ ! -e $SYSFS ]]; then
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echo "Not running in a SEL guest."
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exit 1
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fi
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if [[ $(cat $SYSFS) -ne 1 ]]; then
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echo "Not running in a SEL guest."
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exit 1
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fi
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echo "Running in SEL guest."
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# Copy EBC resources from /boot/sics to tmpfs for security
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# This protects against host injection attacks by moving resources to UV-protected RAM
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echo "Copying EBC resources from $SICS to $EBC_TMPFS"
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if ! mkdir -p "$EBC_TMPFS"; then
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echo "Failed to create $EBC_TMPFS"
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exit 1
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fi
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# Copy only .asr and .pol files
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for file in "$SICS"/*.asr "$SICS"/*.pol; do
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if [[ -f "$file" && ! -L "$file" ]]; then
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cp "$file" "$EBC_TMPFS/" || {
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echo "Failed to copy $file to $EBC_TMPFS"
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exit 1
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}
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fi
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done
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# Verify toc.asr was copied
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if [[ ! -f "$EBC_TMPFS/$TOC" ]]; then
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echo "Error: $EBC_TMPFS/$TOC does not exist after copy"
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exit 1
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fi
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# execute the actual tool with the copied toc.asr
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pvebc --toc "$EBC_TMPFS/$TOC"
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rc=$?
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if [[ $rc -ne 0 ]]; then
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echo "pvebc failed with rc=${rc}"
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exit $rc
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fi
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# Retrieve and check for dummy LUKS passphrase
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pvsecret retrieve --inform name -o "$EBC_TMPFS/$ASR_NAME" --outform bin "$ASR_NAME"
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rc=$?
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if [[ $rc -ne 0 ]]; then
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echo "pvsecret failed with rc=${rc}"
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exit $rc
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fi
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if [[ ! -f "$EBC_TMPFS/$ASR_NAME" ]]; then
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echo "$EBC_TMPFS/$ASR_NAME does not exist"
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exit 1
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fi
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chmod 400 "$EBC_TMPFS/$ASR_NAME"
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exit $?
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