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https://git.code.sf.net/p/linux-ima/ima-evm-utils
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3328f6efed
The SHA-1 algorithm is considered a weak hash algorithm and there has been some movement within certain distros to drop its support completely or at least drop it from the default behavior. ima-evm-utils uses it as the default algorithm in case the user doesn't explicitly ask for another through the --with-default-hash configuration time option or --hashalgo/-a runtime option. With that, make SHA-256 the default hash algorithm instead. Signed-off-by: Bruno Meneguele <bmeneg@redhat.com> Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
37 lines
1.2 KiB
Plaintext
37 lines
1.2 KiB
Plaintext
dnl Copyright (c) 2021 Bruno Meneguele <bmeneg@redhat.com>
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dnl Check hash algorithm availability in the kernel
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dnl
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dnl $1 - $KERNEL_HEADERS
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AC_DEFUN([AX_DEFAULT_HASH_ALGO], [
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HASH_INFO_HEADER="$1/include/uapi/linux/hash_info.h"
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AC_ARG_WITH([default_hash],
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AS_HELP_STRING([--with-default-hash=ALGORITHM], [specifies the default hash algorithm to be used]),
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[HASH_ALGO=$withval],
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[HASH_ALGO=sha256])
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AC_PROG_SED()
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HASH_ALGO="$(echo $HASH_ALGO | $SED 's/\(.*\)/\L\1\E/')"
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AC_CHECK_HEADER([$HASH_INFO_HEADER],
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[HAVE_HASH_INFO_HEADER=yes],
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[AC_MSG_WARN([$HASH_INFO_HEADER not found.])])
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if test "x$HAVE_HASH_INFO_HEADER" = "x"; then
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AC_MSG_RESULT([using $HASH_ALGO algorithm as default hash algorith])
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AC_DEFINE_UNQUOTED(DEFAULT_HASH_ALGO, "$HASH_ALGO", [Define default hash algorithm])
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else
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AC_PROG_GREP()
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$SED -n 's/HASH_ALGO_\(.*\),/\L\1\E/p' $HASH_INFO_HEADER | $GREP -w $HASH_ALGO > /dev/null
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have_hash=$?
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if test $have_hash -ne 0; then
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AC_MSG_ERROR([$HASH_ALGO algorithm specified, but not provided by the kernel], 1)
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else
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AC_MSG_NOTICE([using $HASH_ALGO as default hash algorithm])
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AC_DEFINE_UNQUOTED(DEFAULT_HASH_ALGO, "$HASH_ALGO", [Define default hash algorithm])
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fi
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fi
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])
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