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ima-evm-utils: use tsspcrread to read the TPM 2.0 PCRs

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The kernel does not expose the crypto agile TPM 2.0 PCR banks to
userspace like it exposes PCRs for TPM 1.2.  As a result, a userspace
application is required to read PCRs.

This patch adds tsspcrread support for reading the TPM 2.0 PCRs.
tsspcrread is one application included in the ibmtss package.

Sample error messages:
Failed to read PCRs: (tsspcrread failed: No such file or directory)
Failed to read PCRs: (TSS_Dev_Open: Error opening /dev/tpmrm0)

Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Reviewed-by: Bruno E. O. Meneguele <bmeneg@redhat.com>
This commit is contained in:
Mimi Zohar
2019-07-21 19:19:51 -04:00
parent 340f7eb7dd
commit 31ceff7eb6
2 changed files with 60 additions and 4 deletions
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7
configure.ac
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@ -7,6 +7,7 @@ AC_CONFIG_HEADERS([config.h])
AC_CONFIG_MACRO_DIR([m4])
AC_CANONICAL_HOST
AC_USE_SYSTEM_EXTENSIONS
# Checks for programs.
AC_PROG_CC
@ -29,6 +30,11 @@ AC_SUBST(KERNEL_HEADERS)
AC_CHECK_HEADER(unistd.h)
AC_CHECK_HEADERS(openssl/conf.h)
AC_CHECK_PROG(TSSPCRREAD, [tsspcrread], yes, no)
if test "x$TSSPCRREAD" = "xyes"; then
AC_DEFINE(HAVE_TSSPCRREAD, 1, [Define to 1 if you have tsspcrread binary installed])],
fi
AC_CHECK_HEADERS(sys/xattr.h, , [AC_MSG_ERROR([sys/xattr.h header not found. You need the c-library development package.])])
AC_CHECK_HEADERS(keyutils.h, , [AC_MSG_ERROR([keyutils.h header not found. You need the libkeyutils development package.])])
@ -71,4 +77,5 @@ echo
echo "Configuration:"
echo " debug: $pkg_cv_enable_debug"
echo " openssl-conf: $enable_openssl_conf"
echo " tsspcrread: $TSSPCRREAD"
echo