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kbuild: sign the modules at install time

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Linus deleted the old code and put signing on the install command,
I fixed it to extract the keyid and signer-name within sign-file
and cleaned up that script now it always signs in-place.

Some enthusiast should convert sign-key to perl and pull
x509keyid into it.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rusty Russell
2012-10-19 11:53:15 +10:30
committed by Linus Torvalds
parent c9623de4fc
commit e2a666d52b
5 changed files with 39 additions and 111 deletions
Download Patch File Download Diff File Expand all files Collapse all files

44
scripts/sign-file
View File

@@ -1,8 +1,8 @@
#!/bin/sh
#!/bin/bash
#
# Sign a module file using the given key.
#
# Format: sign-file <key> <x509> <src-file> <dst-file>
# Format: sign-file <key> <x509> <keyid-script> <module>
#
scripts=`dirname $0`
@@ -15,8 +15,8 @@ fi
key="$1"
x509="$2"
src="$3"
dst="$4"
keyid_script="$3"
mod="$4"
if [ ! -r "$key" ]
then
@@ -29,16 +29,6 @@ then
echo "Can't read X.509 certificate" >&2
exit 2
fi
if [ ! -r "$x509.signer" ]
then
echo "Can't read Signer name" >&2
exit 2;
fi
if [ ! -r "$x509.keyid" ]
then
echo "Can't read Key identifier" >&2
exit 2;
fi
#
# Signature parameters
@@ -83,33 +73,35 @@ fi
(
perl -e "binmode STDOUT; print pack(\"C*\", $prologue)" || exit $?
openssl dgst $dgst -binary $src || exit $?
) >$src.dig || exit $?
openssl dgst $dgst -binary $mod || exit $?
) >$mod.dig || exit $?
#
# Generate the binary signature, which will be just the integer that comprises
# the signature with no metadata attached.
#
openssl rsautl -sign -inkey $key -keyform PEM -in $src.dig -out $src.sig || exit $?
signerlen=`stat -c %s $x509.signer`
keyidlen=`stat -c %s $x509.keyid`
siglen=`stat -c %s $src.sig`
openssl rsautl -sign -inkey $key -keyform PEM -in $mod.dig -out $mod.sig || exit $?
SIGNER="`perl $keyid_script $x509 signer-name`"
KEYID="`perl $keyid_script $x509 keyid`"
keyidlen=${#KEYID}
siglen=${#SIGNER}
#
# Build the signed binary
#
(
cat $src || exit $?
cat $mod || exit $?
echo '~Module signature appended~' || exit $?
cat $x509.signer $x509.keyid || exit $?
echo -n "$SIGNER" || exit $?
echo -n "$KEYID" || exit $?
# Preface each signature integer with a 2-byte BE length
perl -e "binmode STDOUT; print pack(\"n\", $siglen)" || exit $?
cat $src.sig || exit $?
cat $mod.sig || exit $?
# Generate the information block
perl -e "binmode STDOUT; print pack(\"CCCCCxxxN\", $algo, $hash, $id_type, $signerlen, $keyidlen, $siglen + 2)" || exit $?
) >$dst~ || exit $?
) >$mod~ || exit $?
# Permit in-place signing
mv $dst~ $dst || exit $?
mv $mod~ $mod || exit $?