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222 lines
6.5 KiB
222 lines
6.5 KiB
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Stefan Berger <stefanb@linux.ibm.com>
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Date: Sun, 15 Mar 2020 12:37:10 -0400
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Subject: [PATCH] ibmvtpm: Add support for trusted boot using a vTPM 2.0
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Add support for trusted boot using a vTPM 2.0 on the IBM IEEE1275
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PowerPC platform. With this patch grub now measures text and binary data
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into the TPM's PCRs 8 and 9 in the same way as the x86_64 platform
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does.
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This patch requires Daniel Axtens's patches for claiming more memory.
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For vTPM support to work on PowerVM, system driver levels 1010.30
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or 1020.00 are required.
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Note: Previous versions of firmware levels with the 2hash-ext-log
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API call have a bug that, once this API call is invoked, has the
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effect of disabling the vTPM driver under Linux causing an error
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message to be displayed in the Linux kernel log. Those users will
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have to update their machines to the firmware levels mentioned
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above.
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Cc: Eric Snowberg <eric.snowberg@oracle.com>
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Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
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---
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grub-core/Makefile.core.def | 7 ++
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grub-core/commands/ieee1275/ibmvtpm.c | 152 ++++++++++++++++++++++++++++++++++
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include/grub/ieee1275/ieee1275.h | 3 +
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3 files changed, 162 insertions(+)
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create mode 100644 grub-core/commands/ieee1275/ibmvtpm.c
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diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
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index ef06f8c95a..b11f74e6b2 100644
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--- a/grub-core/Makefile.core.def
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+++ b/grub-core/Makefile.core.def
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@@ -1104,6 +1104,13 @@ module = {
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enable = powerpc_ieee1275;
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};
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+module = {
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+ name = tpm;
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+ common = commands/tpm.c;
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+ ieee1275 = commands/ieee1275/ibmvtpm.c;
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+ enable = powerpc_ieee1275;
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+};
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+
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module = {
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name = terminal;
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common = commands/terminal.c;
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diff --git a/grub-core/commands/ieee1275/ibmvtpm.c b/grub-core/commands/ieee1275/ibmvtpm.c
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new file mode 100644
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index 0000000000..e68b8448bc
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--- /dev/null
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+++ b/grub-core/commands/ieee1275/ibmvtpm.c
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@@ -0,0 +1,152 @@
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+/*
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+ * GRUB -- GRand Unified Bootloader
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+ * Copyright (C) 2021 Free Software Foundation, Inc.
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+ * Copyright (C) 2021 IBM Corporation
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+ *
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+ * GRUB is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation, either version 3 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * GRUB is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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+ *
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+ * IBM vTPM support code.
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+ */
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+
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+#include <grub/err.h>
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+#include <grub/types.h>
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+#include <grub/tpm.h>
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+#include <grub/ieee1275/ieee1275.h>
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+#include <grub/mm.h>
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+#include <grub/misc.h>
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+
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+static grub_ieee1275_ihandle_t tpm_ihandle;
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+static grub_uint8_t tpm_version;
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+
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+#define IEEE1275_IHANDLE_INVALID ((grub_ieee1275_ihandle_t)0)
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+
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+static void
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+tpm_get_tpm_version (void)
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+{
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+ grub_ieee1275_phandle_t vtpm;
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+ char buffer[20];
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+
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+ if (!grub_ieee1275_finddevice ("/vdevice/vtpm", &vtpm) &&
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+ !grub_ieee1275_get_property (vtpm, "compatible", buffer,
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+ sizeof (buffer), NULL) &&
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+ !grub_strcmp (buffer, "IBM,vtpm20"))
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+ tpm_version = 2;
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+}
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+
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+static grub_err_t
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+tpm_init (void)
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+{
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+ static int init_success = 0;
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+
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+ if (!init_success)
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+ {
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+ if (grub_ieee1275_open ("/vdevice/vtpm", &tpm_ihandle) < 0) {
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+ tpm_ihandle = IEEE1275_IHANDLE_INVALID;
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+ return GRUB_ERR_UNKNOWN_DEVICE;
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+ }
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+
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+ init_success = 1;
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+
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+ tpm_get_tpm_version ();
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+ }
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+
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+ return GRUB_ERR_NONE;
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+}
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+
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+static int
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+ibmvtpm_2hash_ext_log (grub_uint8_t pcrindex,
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+ grub_uint32_t eventtype,
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+ const char *description,
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+ grub_size_t description_size,
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+ void *buf, grub_size_t size)
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+{
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+ struct tpm_2hash_ext_log
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+ {
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+ struct grub_ieee1275_common_hdr common;
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+ grub_ieee1275_cell_t method;
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+ grub_ieee1275_cell_t ihandle;
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+ grub_ieee1275_cell_t size;
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+ grub_ieee1275_cell_t buf;
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+ grub_ieee1275_cell_t description_size;
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+ grub_ieee1275_cell_t description;
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+ grub_ieee1275_cell_t eventtype;
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+ grub_ieee1275_cell_t pcrindex;
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+ grub_ieee1275_cell_t catch_result;
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+ grub_ieee1275_cell_t rc;
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+ }
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+ args;
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+
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+ INIT_IEEE1275_COMMON (&args.common, "call-method", 8, 2);
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+ args.method = (grub_ieee1275_cell_t) "2hash-ext-log";
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+ args.ihandle = tpm_ihandle;
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+ args.pcrindex = pcrindex;
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+ args.eventtype = eventtype;
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+ args.description = (grub_ieee1275_cell_t) description;
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+ args.description_size = description_size;
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+ args.buf = (grub_ieee1275_cell_t) buf;
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+ args.size = (grub_ieee1275_cell_t) size;
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+
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+ if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
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+ return -1;
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+
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+ /*
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+ * catch_result is set if firmware does not support 2hash-ext-log
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+ * rc is GRUB_IEEE1275_CELL_FALSE (0) on failure
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+ */
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+ if ((args.catch_result) || args.rc == GRUB_IEEE1275_CELL_FALSE)
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+ return -1;
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+
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+ return 0;
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+}
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+
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+static grub_err_t
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+tpm2_log_event (unsigned char *buf,
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+ grub_size_t size, grub_uint8_t pcr,
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+ const char *description)
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+{
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+ static int error_displayed = 0;
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+ int err;
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+
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+ err = ibmvtpm_2hash_ext_log (pcr, EV_IPL,
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+ description,
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+ grub_strlen(description) + 1,
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+ buf, size);
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+ if (err && !error_displayed)
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+ {
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+ error_displayed++;
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+ return grub_error (GRUB_ERR_BAD_DEVICE,
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+ "2HASH-EXT-LOG failed: Firmware is likely too old.\n");
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+ }
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+
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+ return GRUB_ERR_NONE;
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+}
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+
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+grub_err_t
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+grub_tpm_measure (unsigned char *buf, grub_size_t size, grub_uint8_t pcr,
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+ const char *description)
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+{
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+ grub_err_t err = tpm_init();
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+
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+ /* Absence of a TPM isn't a failure. */
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+ if (err != GRUB_ERR_NONE)
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+ return GRUB_ERR_NONE;
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+
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+ grub_dprintf ("tpm", "log_event, pcr = %d, size = 0x%" PRIxGRUB_SIZE ", %s\n",
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+ pcr, size, description);
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+
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+ if (tpm_version == 2)
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+ return tpm2_log_event (buf, size, pcr, description);
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+
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+ return GRUB_ERR_NONE;
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+}
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diff --git a/include/grub/ieee1275/ieee1275.h b/include/grub/ieee1275/ieee1275.h
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index 131808d619..87b9f95d34 100644
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--- a/include/grub/ieee1275/ieee1275.h
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+++ b/include/grub/ieee1275/ieee1275.h
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@@ -24,6 +24,9 @@
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#include <grub/types.h>
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#include <grub/machine/ieee1275.h>
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+#define GRUB_IEEE1275_CELL_FALSE ((grub_ieee1275_cell_t) 0)
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+#define GRUB_IEEE1275_CELL_TRUE ((grub_ieee1275_cell_t) -1)
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+
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struct grub_ieee1275_mem_region
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{
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unsigned int start;
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