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From a39c3792ba5677f25fea903b9f1a43740a5f2c0c Mon Sep 17 00:00:00 2001
From: Stefan Berger <stefanb@linux.ibm.com>
Date: Wed, 8 Jun 2022 09:19:07 -0400
Subject: [PATCH] swtpm: Disable OpenSSL FIPS mode to avoid libtpms failures
While libtpms does not provide any means to disable FIPS-disabled crypto
algorithms from being used, work around the issue by simply disabling the
FIPS mode of OpenSSL if it is enabled. If it cannot be disabled, exit
swtpm with a failure message that it cannot be disabled. If FIPS mode
was successfully disabled, print out a message as well.
Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=2090219
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
configure.ac | 9 ++++
src/swtpm/Makefile.am | 2 +
src/swtpm/cuse_tpm.c | 5 ++
src/swtpm/fips.c | 100 ++++++++++++++++++++++++++++++++++++++
src/swtpm/fips.h | 43 ++++++++++++++++
src/swtpm/swtpm.c | 3 ++
src/swtpm/swtpm_chardev.c | 3 ++
src/swtpm/utils.h | 2 +
8 files changed, 167 insertions(+)
create mode 100644 src/swtpm/fips.c
create mode 100644 src/swtpm/fips.h
diff --git a/configure.ac b/configure.ac
index ad3054e..30288c7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -156,6 +156,15 @@ openssl)
AC_MSG_RESULT([Building with openssl crypto library])
LIBCRYPTO_LIBS=$(pkg-config --libs libcrypto)
AC_SUBST([LIBCRYPTO_LIBS])
+ AC_CHECK_HEADERS([openssl/fips.h],
+ [AC_DEFINE_UNQUOTED([HAVE_OPENSSL_FIPS_H], 1,
+ [whether openssl/fips.h is available])]
+ )
+ AC_CHECK_LIB(crypto,
+ [FIPS_mode_set],
+ [AC_DEFINE_UNQUOTED([HAVE_OPENSSL_FIPS_MODE_SET_API], 1,
+ [whether FIPS_mode_set API is available])]
+ )
;;
esac
diff --git a/src/swtpm/Makefile.am b/src/swtpm/Makefile.am
index 5454a6f..2a65950 100644
--- a/src/swtpm/Makefile.am
+++ b/src/swtpm/Makefile.am
@@ -11,6 +11,7 @@ noinst_HEADERS = \
capabilities.h \
common.h \
ctrlchannel.h \
+ fips.h \
key.h \
locality.h \
logging.h \
@@ -40,6 +41,7 @@ libswtpm_libtpms_la_SOURCES = \
capabilities.c \
common.c \
ctrlchannel.c \
+ fips.c \
key.c \
logging.c \
mainloop.c \
diff --git a/src/swtpm/cuse_tpm.c b/src/swtpm/cuse_tpm.c
index 9dbc00d..3026e26 100644
--- a/src/swtpm/cuse_tpm.c
+++ b/src/swtpm/cuse_tpm.c
@@ -1695,6 +1695,11 @@ int swtpm_cuse_main(int argc, char **argv, const char *prgname, const char *ifac
goto exit;
}
+ if (disable_fips_mode() < 0) {
+ ret = -1;
+ goto exit;
+ }
+
if (tpmlib_register_callbacks(&cbs) != TPM_SUCCESS) {
ret = -1;
goto exit;
diff --git a/src/swtpm/fips.c b/src/swtpm/fips.c
new file mode 100644
index 0000000..eeb2a0c
--- /dev/null
+++ b/src/swtpm/fips.c
@@ -0,0 +1,100 @@
+/*
+ * fips.c -- FIPS mode related functions
+ *
+ * (c) Copyright IBM Corporation 2022.
+ *
+ * Author: Stefan Berger <stefanb@us.ibm.com>
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * Neither the names of the IBM Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include "fips.h"
+#include "logging.h"
+
+#if defined(HAVE_OPENSSL_FIPS_H)
+# include <openssl/fips.h>
+#elif defined(HAVE_OPENSSL_FIPS_MODE_SET_API)
+/* Cygwin has no fips.h but API exists */
+extern int FIPS_mode(void);
+extern int FIPS_mode_set(int);
+#endif
+
+#if OPENSSL_VERSION_NUMBER >= 0x30000000L
+# include <openssl/evp.h>
+#endif
+
+#include <openssl/err.h>
+
+/*
+ * disable_fips_mode: If possible, disable FIPS mode to avoid libtpms failures
+ *
+ * While libtpms does not provide a solution to disable deactivated algorithms
+ * avoid libtpms failures due to FIPS mode enablement by disabling FIPS mode.
+ *
+ * Returns < 0 on error, 0 otherwise.
+ */
+#if defined(HAVE_OPENSSL_FIPS_H) || defined(HAVE_OPENSSL_FIPS_MODE_SET_API)
+int disable_fips_mode(void)
+{
+#if OPENSSL_VERSION_NUMBER >= 0x30000000L
+ int mode = EVP_default_properties_is_fips_enabled(NULL);
+#else
+ int mode = FIPS_mode();
+#endif
+ int ret = 0;
+
+ if (mode != 0) {
+#if OPENSSL_VERSION_NUMBER >= 0x30000000L
+ int rc = EVP_default_properties_enable_fips(NULL, 0);
+#else
+ int rc = FIPS_mode_set(0);
+#endif
+ if (rc == 1) {
+ logprintf(STDOUT_FILENO,
+ "Warning: Disabled OpenSSL FIPS mode\n");
+ } else {
+ unsigned long err = ERR_get_error();
+ logprintf(STDERR_FILENO,
+ "Failed to disable OpenSSL FIPS mode: %s\n",
+ ERR_error_string(err, NULL));
+ ret = -1;
+ }
+ }
+ return ret;
+}
+#else
+/* OpenBSD & DragonFlyBSD case */
+int disable_fips_mode(void)
+{
+ return 0;
+}
+#endif
diff --git a/src/swtpm/fips.h b/src/swtpm/fips.h
new file mode 100644
index 0000000..14d4e9f
--- /dev/null
+++ b/src/swtpm/fips.h
@@ -0,0 +1,43 @@
+/*
+ * fips.h -- FIPS mode related functions
+ *
+ * (c) Copyright IBM Corporation 2015.
+ *
+ * Author: Stefan Berger <stefanb@us.ibm.com>
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * Neither the names of the IBM Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _SWTPM_UTILS_H_
+#define _SWTPM_UTILS_H_
+
+int disable_fips_mode(void);
+
+#endif /* _SWTPM_UTILS_H_ */
diff --git a/src/swtpm/swtpm.c b/src/swtpm/swtpm.c
index 722a743..e618c56 100644
--- a/src/swtpm/swtpm.c
+++ b/src/swtpm/swtpm.c
@@ -521,6 +521,9 @@ int swtpm_main(int argc, char **argv, const char *prgname, const char *iface)
daemonize_finish();
}
+ if (disable_fips_mode() < 0)
+ goto error_seccomp_profile;
+
rc = mainLoop(&mlp, notify_fd[0]);
error_seccomp_profile:
diff --git a/src/swtpm/swtpm_chardev.c b/src/swtpm/swtpm_chardev.c
index 9710927..ab6d8fd 100644
--- a/src/swtpm/swtpm_chardev.c
+++ b/src/swtpm/swtpm_chardev.c
@@ -573,6 +573,9 @@ int swtpm_chardev_main(int argc, char **argv, const char *prgname, const char *i
daemonize_finish();
}
+ if (disable_fips_mode() < 0)
+ goto error_seccomp_profile;
+
rc = mainLoop(&mlp, notify_fd[0]);
error_seccomp_profile:
diff --git a/src/swtpm/utils.h b/src/swtpm/utils.h
index 7502442..b8acd89 100644
--- a/src/swtpm/utils.h
+++ b/src/swtpm/utils.h
@@ -71,4 +71,6 @@ ssize_t writev_full(int fd, const struct iovec *iov, int iovcnt);
ssize_t read_eintr(int fd, void *buffer, size_t buflen);
+int disable_fips_mode(void);
+
#endif /* _SWTPM_UTILS_H_ */
--
2.36.1
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