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61 lines
1.6 KiB
Bash
Executable File
61 lines
1.6 KiB
Bash
Executable File
#!/bin/bash
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# extend a TPM PCR with a module and then load it
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# any arguments will also be measured.
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# The default PCR to be extended is 5, but can be
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# overridden with the MODULE_PCR environment variable
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. /etc/functions
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TRACE_FUNC
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MODULE="$1"; shift
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if [ -z "$MODULE_PCR" ]; then
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MODULE_PCR=5
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fi
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if [ -z "$MODULE" ]; then
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die "Usage: $0 module [args...]"
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fi
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if [ ! -r "$MODULE" ]; then
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die "$MODULE: not found?"
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fi
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# Check if module is already loaded
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# Transform module name changing _ for - and trailing .ko if present
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# Unify lsmod output to use - instead of _ for comparison
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module_name=$(basename "$MODULE" | sed 's/_/-/g' | sed 's/\.ko$//')
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if lsmod | sed 's/_/-/g' | grep -q "^$module_name\\b"; then
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DEBUG "$MODULE: already loaded"
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exit 0
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fi
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if [ ! -r /sys/class/tpm/tpm0/pcrs -o ! -x /bin/tpm ]; then
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if [ ! -c /dev/tpmrm0 -o ! -x /bin/tpm2 ]; then
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tpm_missing=1
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fi
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fi
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if [ -z "$tpm_missing" ]; then
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DEBUG "Extending TPM PCR $MODULE_PCR with $MODULE prior of usage"
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tpmr extend -ix "$MODULE_PCR" -if "$MODULE" \
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|| die "$MODULE: tpm extend failed"
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fi
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if [ ! -z "$*" -a -z "$tpm_missing" ]; then
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DEBUG "Extending TPM PCR $MODULE_PCR with $*"
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TMPFILE=/tmp/insmod.$$
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echo "$@" > $TMPFILE
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DEBUG "Extending TPM PCR $MODULE_PCR with $MODULE prior of usage"
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tpmr extend -ix "$MODULE_PCR" -if $TMPFILE \
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|| die "$MODULE: tpm extend on arguments failed"
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fi
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# Since we have replaced the real insmod, we must invoke
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# the busybox insmod via the original executable
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DEBUG "Loading $MODULE with busybox insmod"
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busybox insmod "$MODULE" "$@" \
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|| die "$MODULE: insmod failed"
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