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tpm: Move backend code under the 'backends/' directory

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TPM subsytem is split into backends (see commit f4ede81eed)
and frontends (see i.e. 3676bc69b3). Keep the emulated
hardware 'frontends' under hw/tpm/, but move the backends
in the backends/tpm/ directory.

Suggested-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20200612085444.8362-13-philmd@redhat.com
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
This commit is contained in:
Philippe Mathieu-Daudé 2020-06-12 10:54:44 +02:00 • committed by Stefan Berger
parent 0f7d214820
commit ca64b08638
16 changed files with 62 additions and 60 deletions
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1
backends/Kconfig Normal file
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@ -0,0 +1 @@
source tpm/Kconfig

14
backends/tpm/Kconfig Normal file
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@ -0,0 +1,14 @@
config TPM_BACKEND
bool
depends on TPM
config TPM_PASSTHROUGH
bool
default y
# FIXME: should check for x86 host as well
depends on TPM_BACKEND && LINUX
config TPM_EMULATOR
bool
default y
depends on TPM_BACKEND

3
backends/tpm/Makefile.objs
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@ -1 +1,4 @@
common-obj-y += tpm_backend.o
common-obj-y += tpm_util.o
common-obj-$(CONFIG_TPM_PASSTHROUGH) += tpm_passthrough.o
common-obj-$(CONFIG_TPM_EMULATOR) += tpm_emulator.o

997
backends/tpm/tpm_emulator.c Normal file
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@ -0,0 +1,997 @@
/*
* Emulator TPM driver
*
* Copyright (c) 2017 Intel Corporation
* Author: Amarnath Valluri <amarnath.valluri@intel.com>
*
* Copyright (c) 2010 - 2013, 2018 IBM Corporation
* Authors:
* Stefan Berger <stefanb@us.ibm.com>
*
* Copyright (C) 2011 IAIK, Graz University of Technology
* Author: Andreas Niederl
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>
*
*/
#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
#include "qemu/sockets.h"
#include "io/channel-socket.h"
#include "sysemu/tpm_backend.h"
#include "sysemu/tpm_util.h"
#include "tpm_int.h"
#include "tpm_ioctl.h"
#include "migration/blocker.h"
#include "migration/vmstate.h"
#include "qapi/error.h"
#include "qapi/clone-visitor.h"
#include "qapi/qapi-visit-tpm.h"
#include "chardev/char-fe.h"
#include "trace.h"
#define TYPE_TPM_EMULATOR "tpm-emulator"
#define TPM_EMULATOR(obj) \
OBJECT_CHECK(TPMEmulator, (obj), TYPE_TPM_EMULATOR)
#define TPM_EMULATOR_IMPLEMENTS_ALL_CAPS(S, cap) (((S)->caps & (cap)) == (cap))
/* data structures */
/* blobs from the TPM; part of VM state when migrating */
typedef struct TPMBlobBuffers {
uint32_t permanent_flags;
TPMSizedBuffer permanent;
uint32_t volatil_flags;
TPMSizedBuffer volatil;
uint32_t savestate_flags;
TPMSizedBuffer savestate;
} TPMBlobBuffers;
typedef struct TPMEmulator {
TPMBackend parent;
TPMEmulatorOptions *options;
CharBackend ctrl_chr;
QIOChannel *data_ioc;
TPMVersion tpm_version;
ptm_cap caps; /* capabilities of the TPM */
uint8_t cur_locty_number; /* last set locality */
Error *migration_blocker;
QemuMutex mutex;
unsigned int established_flag:1;
unsigned int established_flag_cached:1;
TPMBlobBuffers state_blobs;
} TPMEmulator;
struct tpm_error {
uint32_t tpm_result;
const char *string;
};
static const struct tpm_error tpm_errors[] = {
/* TPM 1.2 error codes */
{ TPM_BAD_PARAMETER , "a parameter is bad" },
{ TPM_FAIL , "operation failed" },
{ TPM_KEYNOTFOUND , "key could not be found" },
{ TPM_BAD_PARAM_SIZE , "bad parameter size"},
{ TPM_ENCRYPT_ERROR , "encryption error" },
{ TPM_DECRYPT_ERROR , "decryption error" },
{ TPM_BAD_KEY_PROPERTY, "bad key property" },
{ TPM_BAD_MODE , "bad (encryption) mode" },
{ TPM_BAD_VERSION , "bad version identifier" },
{ TPM_BAD_LOCALITY , "bad locality" },
/* TPM 2 error codes */
{ TPM_RC_FAILURE , "operation failed" },
{ TPM_RC_LOCALITY , "bad locality" },
{ TPM_RC_INSUFFICIENT, "insufficient amount of data" },
};
static const char *tpm_emulator_strerror(uint32_t tpm_result)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(tpm_errors); i++) {
if (tpm_errors[i].tpm_result == tpm_result) {
return tpm_errors[i].string;
}
}
return "";
}
static int tpm_emulator_ctrlcmd(TPMEmulator *tpm, unsigned long cmd, void *msg,
size_t msg_len_in, size_t msg_len_out)
{
CharBackend *dev = &tpm->ctrl_chr;
uint32_t cmd_no = cpu_to_be32(cmd);
ssize_t n = sizeof(uint32_t) + msg_len_in;
uint8_t *buf = NULL;
int ret = -1;
qemu_mutex_lock(&tpm->mutex);
buf = g_alloca(n);
memcpy(buf, &cmd_no, sizeof(cmd_no));
memcpy(buf + sizeof(cmd_no), msg, msg_len_in);
n = qemu_chr_fe_write_all(dev, buf, n);
if (n <= 0) {
goto end;
}
if (msg_len_out != 0) {
n = qemu_chr_fe_read_all(dev, msg, msg_len_out);
if (n <= 0) {
goto end;
}
}
ret = 0;
end:
qemu_mutex_unlock(&tpm->mutex);
return ret;
}
static int tpm_emulator_unix_tx_bufs(TPMEmulator *tpm_emu,
const uint8_t *in, uint32_t in_len,
uint8_t *out, uint32_t out_len,
bool *selftest_done,
Error **errp)
{
ssize_t ret;
bool is_selftest = false;
if (selftest_done) {
*selftest_done = false;
is_selftest = tpm_util_is_selftest(in, in_len);
}
ret = qio_channel_write_all(tpm_emu->data_ioc, (char *)in, in_len, errp);
if (ret != 0) {
return -1;
}
ret = qio_channel_read_all(tpm_emu->data_ioc, (char *)out,
sizeof(struct tpm_resp_hdr), errp);
if (ret != 0) {
return -1;
}
ret = qio_channel_read_all(tpm_emu->data_ioc,
(char *)out + sizeof(struct tpm_resp_hdr),
tpm_cmd_get_size(out) - sizeof(struct tpm_resp_hdr), errp);
if (ret != 0) {
return -1;
}
if (is_selftest) {
*selftest_done = tpm_cmd_get_errcode(out) == 0;
}
return 0;
}
static int tpm_emulator_set_locality(TPMEmulator *tpm_emu, uint8_t locty_number,
Error **errp)
{
ptm_loc loc;
if (tpm_emu->cur_locty_number == locty_number) {
return 0;
}
trace_tpm_emulator_set_locality(locty_number);
memset(&loc, 0, sizeof(loc));
loc.u.req.loc = locty_number;
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_SET_LOCALITY, &loc,
sizeof(loc), sizeof(loc)) < 0) {
error_setg(errp, "tpm-emulator: could not set locality : %s",
strerror(errno));
return -1;
}
loc.u.resp.tpm_result = be32_to_cpu(loc.u.resp.tpm_result);
if (loc.u.resp.tpm_result != 0) {
error_setg(errp, "tpm-emulator: TPM result for set locality : 0x%x",
loc.u.resp.tpm_result);
return -1;
}
tpm_emu->cur_locty_number = locty_number;
return 0;
}
static void tpm_emulator_handle_request(TPMBackend *tb, TPMBackendCmd *cmd,
Error **errp)
{
TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
trace_tpm_emulator_handle_request();
if (tpm_emulator_set_locality(tpm_emu, cmd->locty, errp) < 0 ||
tpm_emulator_unix_tx_bufs(tpm_emu, cmd->in, cmd->in_len,
cmd->out, cmd->out_len,
&cmd->selftest_done, errp) < 0) {
tpm_util_write_fatal_error_response(cmd->out, cmd->out_len);
}
}
static int tpm_emulator_probe_caps(TPMEmulator *tpm_emu)
{
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_GET_CAPABILITY,
&tpm_emu->caps, 0, sizeof(tpm_emu->caps)) < 0) {
error_report("tpm-emulator: probing failed : %s", strerror(errno));
return -1;
}
tpm_emu->caps = be64_to_cpu(tpm_emu->caps);
trace_tpm_emulator_probe_caps(tpm_emu->caps);
return 0;
}
static int tpm_emulator_check_caps(TPMEmulator *tpm_emu)
{
ptm_cap caps = 0;
const char *tpm = NULL;
/* check for min. required capabilities */
switch (tpm_emu->tpm_version) {
case TPM_VERSION_1_2:
caps = PTM_CAP_INIT | PTM_CAP_SHUTDOWN | PTM_CAP_GET_TPMESTABLISHED |
PTM_CAP_SET_LOCALITY | PTM_CAP_SET_DATAFD | PTM_CAP_STOP |
PTM_CAP_SET_BUFFERSIZE;
tpm = "1.2";
break;
case TPM_VERSION_2_0:
caps = PTM_CAP_INIT | PTM_CAP_SHUTDOWN | PTM_CAP_GET_TPMESTABLISHED |
PTM_CAP_SET_LOCALITY | PTM_CAP_RESET_TPMESTABLISHED |
PTM_CAP_SET_DATAFD | PTM_CAP_STOP | PTM_CAP_SET_BUFFERSIZE;
tpm = "2";
break;
case TPM_VERSION_UNSPEC:
error_report("tpm-emulator: TPM version has not been set");
return -1;
}
if (!TPM_EMULATOR_IMPLEMENTS_ALL_CAPS(tpm_emu, caps)) {
error_report("tpm-emulator: TPM does not implement minimum set of "
"required capabilities for TPM %s (0x%x)", tpm, (int)caps);
return -1;
}
return 0;
}
static int tpm_emulator_stop_tpm(TPMBackend *tb)
{
TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
ptm_res res;
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_STOP, &res, 0, sizeof(res)) < 0) {
error_report("tpm-emulator: Could not stop TPM: %s",
strerror(errno));
return -1;
}
res = be32_to_cpu(res);
if (res) {
error_report("tpm-emulator: TPM result for CMD_STOP: 0x%x %s", res,
tpm_emulator_strerror(res));
return -1;
}
return 0;
}
static int tpm_emulator_set_buffer_size(TPMBackend *tb,
size_t wanted_size,
size_t *actual_size)
{
TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
ptm_setbuffersize psbs;
if (tpm_emulator_stop_tpm(tb) < 0) {
return -1;
}
psbs.u.req.buffersize = cpu_to_be32(wanted_size);
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_SET_BUFFERSIZE, &psbs,
sizeof(psbs.u.req), sizeof(psbs.u.resp)) < 0) {
error_report("tpm-emulator: Could not set buffer size: %s",
strerror(errno));
return -1;
}
psbs.u.resp.tpm_result = be32_to_cpu(psbs.u.resp.tpm_result);
if (psbs.u.resp.tpm_result != 0) {
error_report("tpm-emulator: TPM result for set buffer size : 0x%x %s",
psbs.u.resp.tpm_result,
tpm_emulator_strerror(psbs.u.resp.tpm_result));
return -1;
}
if (actual_size) {
*actual_size = be32_to_cpu(psbs.u.resp.buffersize);
}
trace_tpm_emulator_set_buffer_size(
be32_to_cpu(psbs.u.resp.buffersize),
be32_to_cpu(psbs.u.resp.minsize),
be32_to_cpu(psbs.u.resp.maxsize));
return 0;
}
static int tpm_emulator_startup_tpm_resume(TPMBackend *tb, size_t buffersize,
bool is_resume)
{
TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
ptm_init init = {
.u.req.init_flags = 0,
};
ptm_res res;
trace_tpm_emulator_startup_tpm_resume(is_resume, buffersize);
if (buffersize != 0 &&
tpm_emulator_set_buffer_size(tb, buffersize, NULL) < 0) {
goto err_exit;
}
if (is_resume) {
init.u.req.init_flags |= cpu_to_be32(PTM_INIT_FLAG_DELETE_VOLATILE);
}
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_INIT, &init, sizeof(init),
sizeof(init)) < 0) {
error_report("tpm-emulator: could not send INIT: %s",
strerror(errno));
goto err_exit;
}
res = be32_to_cpu(init.u.resp.tpm_result);
if (res) {
error_report("tpm-emulator: TPM result for CMD_INIT: 0x%x %s", res,
tpm_emulator_strerror(res));
goto err_exit;
}
return 0;
err_exit:
return -1;
}
static int tpm_emulator_startup_tpm(TPMBackend *tb, size_t buffersize)
{
return tpm_emulator_startup_tpm_resume(tb, buffersize, false);
}
static bool tpm_emulator_get_tpm_established_flag(TPMBackend *tb)
{
TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
ptm_est est;
if (tpm_emu->established_flag_cached) {
return tpm_emu->established_flag;
}
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_GET_TPMESTABLISHED, &est,
0, sizeof(est)) < 0) {
error_report("tpm-emulator: Could not get the TPM established flag: %s",
strerror(errno));
return false;
}
trace_tpm_emulator_get_tpm_established_flag(est.u.resp.bit);
tpm_emu->established_flag_cached = 1;
tpm_emu->established_flag = (est.u.resp.bit != 0);
return tpm_emu->established_flag;
}
static int tpm_emulator_reset_tpm_established_flag(TPMBackend *tb,
uint8_t locty)
{
TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
ptm_reset_est reset_est;
ptm_res res;
/* only a TPM 2.0 will support this */
if (tpm_emu->tpm_version != TPM_VERSION_2_0) {
return 0;
}
reset_est.u.req.loc = tpm_emu->cur_locty_number;
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_RESET_TPMESTABLISHED,
&reset_est, sizeof(reset_est),
sizeof(reset_est)) < 0) {
error_report("tpm-emulator: Could not reset the establishment bit: %s",
strerror(errno));
return -1;
}
res = be32_to_cpu(reset_est.u.resp.tpm_result);
if (res) {
error_report(
"tpm-emulator: TPM result for rest established flag: 0x%x %s",
res, tpm_emulator_strerror(res));
return -1;
}
tpm_emu->established_flag_cached = 0;
return 0;
}
static void tpm_emulator_cancel_cmd(TPMBackend *tb)
{
TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
ptm_res res;
if (!TPM_EMULATOR_IMPLEMENTS_ALL_CAPS(tpm_emu, PTM_CAP_CANCEL_TPM_CMD)) {
trace_tpm_emulator_cancel_cmd_not_supt();
return;
}
/* FIXME: make the function non-blocking, or it may block a VCPU */
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_CANCEL_TPM_CMD, &res, 0,
sizeof(res)) < 0) {
error_report("tpm-emulator: Could not cancel command: %s",
strerror(errno));
} else if (res != 0) {
error_report("tpm-emulator: Failed to cancel TPM: 0x%x",
be32_to_cpu(res));
}
}
static TPMVersion tpm_emulator_get_tpm_version(TPMBackend *tb)
{
TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
return tpm_emu->tpm_version;
}
static size_t tpm_emulator_get_buffer_size(TPMBackend *tb)
{
size_t actual_size;
if (tpm_emulator_set_buffer_size(tb, 0, &actual_size) < 0) {
return 4096;
}
return actual_size;
}
static int tpm_emulator_block_migration(TPMEmulator *tpm_emu)
{
Error *err = NULL;
ptm_cap caps = PTM_CAP_GET_STATEBLOB | PTM_CAP_SET_STATEBLOB |
PTM_CAP_STOP;
if (!TPM_EMULATOR_IMPLEMENTS_ALL_CAPS(tpm_emu, caps)) {
error_setg(&tpm_emu->migration_blocker,
"Migration disabled: TPM emulator does not support "
"migration");
migrate_add_blocker(tpm_emu->migration_blocker, &err);
if (err) {
error_report_err(err);
error_free(tpm_emu->migration_blocker);
tpm_emu->migration_blocker = NULL;
return -1;
}
}
return 0;
}
static int tpm_emulator_prepare_data_fd(TPMEmulator *tpm_emu)
{
ptm_res res;
Error *err = NULL;
int fds[2] = { -1, -1 };
if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) < 0) {
error_report("tpm-emulator: Failed to create socketpair");
return -1;
}
qemu_chr_fe_set_msgfds(&tpm_emu->ctrl_chr, fds + 1, 1);
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_SET_DATAFD, &res, 0,
sizeof(res)) < 0 || res != 0) {
error_report("tpm-emulator: Failed to send CMD_SET_DATAFD: %s",
strerror(errno));
goto err_exit;
}
tpm_emu->data_ioc = QIO_CHANNEL(qio_channel_socket_new_fd(fds[0], &err));
if (err) {
error_prepend(&err, "tpm-emulator: Failed to create io channel: ");
error_report_err(err);
goto err_exit;
}
closesocket(fds[1]);
return 0;
err_exit:
closesocket(fds[0]);
closesocket(fds[1]);
return -1;
}
static int tpm_emulator_handle_device_opts(TPMEmulator *tpm_emu, QemuOpts *opts)
{
const char *value;
value = qemu_opt_get(opts, "chardev");
if (value) {
Error *err = NULL;
Chardev *dev = qemu_chr_find(value);
if (!dev) {
error_report("tpm-emulator: tpm chardev '%s' not found.", value);
goto err;
}
if (!qemu_chr_fe_init(&tpm_emu->ctrl_chr, dev, &err)) {
error_prepend(&err, "tpm-emulator: No valid chardev found at '%s':",
value);
error_report_err(err);
goto err;
}
tpm_emu->options->chardev = g_strdup(value);
}
if (tpm_emulator_prepare_data_fd(tpm_emu) < 0) {
goto err;
}
/* FIXME: tpm_util_test_tpmdev() accepts only on socket fd, as it also used
* by passthrough driver, which not yet using GIOChannel.
*/
if (tpm_util_test_tpmdev(QIO_CHANNEL_SOCKET(tpm_emu->data_ioc)->fd,
&tpm_emu->tpm_version)) {
error_report("'%s' is not emulating TPM device. Error: %s",
tpm_emu->options->chardev, strerror(errno));
goto err;
}
switch (tpm_emu->tpm_version) {
case TPM_VERSION_1_2:
trace_tpm_emulator_handle_device_opts_tpm12();
break;
case TPM_VERSION_2_0:
trace_tpm_emulator_handle_device_opts_tpm2();
break;
default:
trace_tpm_emulator_handle_device_opts_unspec();
}
if (tpm_emulator_probe_caps(tpm_emu) ||
tpm_emulator_check_caps(tpm_emu)) {
goto err;
}
return tpm_emulator_block_migration(tpm_emu);
err:
trace_tpm_emulator_handle_device_opts_startup_error();
return -1;
}
static TPMBackend *tpm_emulator_create(QemuOpts *opts)
{
TPMBackend *tb = TPM_BACKEND(object_new(TYPE_TPM_EMULATOR));
if (tpm_emulator_handle_device_opts(TPM_EMULATOR(tb), opts)) {
object_unref(OBJECT(tb));
return NULL;
}
return tb;
}
static TpmTypeOptions *tpm_emulator_get_tpm_options(TPMBackend *tb)
{
TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
TpmTypeOptions *options = g_new0(TpmTypeOptions, 1);
options->type = TPM_TYPE_OPTIONS_KIND_EMULATOR;
options->u.emulator.data = QAPI_CLONE(TPMEmulatorOptions, tpm_emu->options);
return options;
}
static const QemuOptDesc tpm_emulator_cmdline_opts[] = {
TPM_STANDARD_CMDLINE_OPTS,
{
.name = "chardev",
.type = QEMU_OPT_STRING,
.help = "Character device to use for out-of-band control messages",
},
{ /* end of list */ },
};
/*
* Transfer a TPM state blob from the TPM into a provided buffer.
*
* @tpm_emu: TPMEmulator
* @type: the type of blob to transfer
* @tsb: the TPMSizeBuffer to fill with the blob
* @flags: the flags to return to the caller
*/
static int tpm_emulator_get_state_blob(TPMEmulator *tpm_emu,
uint8_t type,
TPMSizedBuffer *tsb,
uint32_t *flags)
{
ptm_getstate pgs;
ptm_res res;
ssize_t n;
uint32_t totlength, length;
tpm_sized_buffer_reset(tsb);
pgs.u.req.state_flags = cpu_to_be32(PTM_STATE_FLAG_DECRYPTED);
pgs.u.req.type = cpu_to_be32(type);
pgs.u.req.offset = 0;
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_GET_STATEBLOB,
&pgs, sizeof(pgs.u.req),
offsetof(ptm_getstate, u.resp.data)) < 0) {
error_report("tpm-emulator: could not get state blob type %d : %s",
type, strerror(errno));
return -1;
}
res = be32_to_cpu(pgs.u.resp.tpm_result);
if (res != 0 && (res & 0x800) == 0) {
error_report("tpm-emulator: Getting the stateblob (type %d) failed "
"with a TPM error 0x%x %s", type, res,
tpm_emulator_strerror(res));
return -1;
}
totlength = be32_to_cpu(pgs.u.resp.totlength);
length = be32_to_cpu(pgs.u.resp.length);
if (totlength != length) {
error_report("tpm-emulator: Expecting to read %u bytes "
"but would get %u", totlength, length);
return -1;
}
*flags = be32_to_cpu(pgs.u.resp.state_flags);
if (totlength > 0) {
tsb->buffer = g_try_malloc(totlength);
if (!tsb->buffer) {
error_report("tpm-emulator: Out of memory allocating %u bytes",
totlength);
return -1;
}
n = qemu_chr_fe_read_all(&tpm_emu->ctrl_chr, tsb->buffer, totlength);
if (n != totlength) {
error_report("tpm-emulator: Could not read stateblob (type %d); "
"expected %u bytes, got %zd",
type, totlength, n);
return -1;
}
}
tsb->size = totlength;
trace_tpm_emulator_get_state_blob(type, tsb->size, *flags);
return 0;
}
static int tpm_emulator_get_state_blobs(TPMEmulator *tpm_emu)
{
TPMBlobBuffers *state_blobs = &tpm_emu->state_blobs;
if (tpm_emulator_get_state_blob(tpm_emu, PTM_BLOB_TYPE_PERMANENT,
&state_blobs->permanent,
&state_blobs->permanent_flags) < 0 ||
tpm_emulator_get_state_blob(tpm_emu, PTM_BLOB_TYPE_VOLATILE,
&state_blobs->volatil,
&state_blobs->volatil_flags) < 0 ||
tpm_emulator_get_state_blob(tpm_emu, PTM_BLOB_TYPE_SAVESTATE,
&state_blobs->savestate,
&state_blobs->savestate_flags) < 0) {
goto err_exit;
}
return 0;
err_exit:
tpm_sized_buffer_reset(&state_blobs->volatil);
tpm_sized_buffer_reset(&state_blobs->permanent);
tpm_sized_buffer_reset(&state_blobs->savestate);
return -1;
}
/*
* Transfer a TPM state blob to the TPM emulator.
*
* @tpm_emu: TPMEmulator
* @type: the type of TPM state blob to transfer
* @tsb: TPMSizedBuffer containing the TPM state blob
* @flags: Flags describing the (encryption) state of the TPM state blob
*/
static int tpm_emulator_set_state_blob(TPMEmulator *tpm_emu,
uint32_t type,
TPMSizedBuffer *tsb,
uint32_t flags)
{
ssize_t n;
ptm_setstate pss;
ptm_res tpm_result;
if (tsb->size == 0) {
return 0;
}
pss = (ptm_setstate) {
.u.req.state_flags = cpu_to_be32(flags),
.u.req.type = cpu_to_be32(type),
.u.req.length = cpu_to_be32(tsb->size),
};
/* write the header only */
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_SET_STATEBLOB, &pss,
offsetof(ptm_setstate, u.req.data), 0) < 0) {
error_report("tpm-emulator: could not set state blob type %d : %s",
type, strerror(errno));
return -1;
}
/* now the body */
n = qemu_chr_fe_write_all(&tpm_emu->ctrl_chr, tsb->buffer, tsb->size);
if (n != tsb->size) {
error_report("tpm-emulator: Writing the stateblob (type %d) "
"failed; could not write %u bytes, but only %zd",
type, tsb->size, n);
return -1;
}
/* now get the result */
n = qemu_chr_fe_read_all(&tpm_emu->ctrl_chr,
(uint8_t *)&pss, sizeof(pss.u.resp));
if (n != sizeof(pss.u.resp)) {
error_report("tpm-emulator: Reading response from writing stateblob "
"(type %d) failed; expected %zu bytes, got %zd", type,
sizeof(pss.u.resp), n);
return -1;
}
tpm_result = be32_to_cpu(pss.u.resp.tpm_result);
if (tpm_result != 0) {
error_report("tpm-emulator: Setting the stateblob (type %d) failed "
"with a TPM error 0x%x %s", type, tpm_result,
tpm_emulator_strerror(tpm_result));
return -1;
}
trace_tpm_emulator_set_state_blob(type, tsb->size, flags);
return 0;
}
/*
* Set all the TPM state blobs.
*
* Returns a negative errno code in case of error.
*/
static int tpm_emulator_set_state_blobs(TPMBackend *tb)
{
TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
TPMBlobBuffers *state_blobs = &tpm_emu->state_blobs;
trace_tpm_emulator_set_state_blobs();
if (tpm_emulator_stop_tpm(tb) < 0) {
trace_tpm_emulator_set_state_blobs_error("Could not stop TPM");
return -EIO;
}
if (tpm_emulator_set_state_blob(tpm_emu, PTM_BLOB_TYPE_PERMANENT,
&state_blobs->permanent,
state_blobs->permanent_flags) < 0 ||
tpm_emulator_set_state_blob(tpm_emu, PTM_BLOB_TYPE_VOLATILE,
&state_blobs->volatil,
state_blobs->volatil_flags) < 0 ||
tpm_emulator_set_state_blob(tpm_emu, PTM_BLOB_TYPE_SAVESTATE,
&state_blobs->savestate,
state_blobs->savestate_flags) < 0) {
return -EIO;
}
trace_tpm_emulator_set_state_blobs_done();
return 0;
}
static int tpm_emulator_pre_save(void *opaque)
{
TPMBackend *tb = opaque;
TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
trace_tpm_emulator_pre_save();
tpm_backend_finish_sync(tb);
/* get the state blobs from the TPM */
return tpm_emulator_get_state_blobs(tpm_emu);
}
/*
* Load the TPM state blobs into the TPM.
*
* Returns negative errno codes in case of error.
*/
static int tpm_emulator_post_load(void *opaque, int version_id)
{
TPMBackend *tb = opaque;
int ret;
ret = tpm_emulator_set_state_blobs(tb);
if (ret < 0) {
return ret;
}
if (tpm_emulator_startup_tpm_resume(tb, 0, true) < 0) {
return -EIO;
}
return 0;
}
static const VMStateDescription vmstate_tpm_emulator = {
.name = "tpm-emulator",
.version_id = 0,
.pre_save = tpm_emulator_pre_save,
.post_load = tpm_emulator_post_load,
.fields = (VMStateField[]) {
VMSTATE_UINT32(state_blobs.permanent_flags, TPMEmulator),
VMSTATE_UINT32(state_blobs.permanent.size, TPMEmulator),
VMSTATE_VBUFFER_ALLOC_UINT32(state_blobs.permanent.buffer,
TPMEmulator, 0, 0,
state_blobs.permanent.size),
VMSTATE_UINT32(state_blobs.volatil_flags, TPMEmulator),
VMSTATE_UINT32(state_blobs.volatil.size, TPMEmulator),
VMSTATE_VBUFFER_ALLOC_UINT32(state_blobs.volatil.buffer,
TPMEmulator, 0, 0,
state_blobs.volatil.size),
VMSTATE_UINT32(state_blobs.savestate_flags, TPMEmulator),
VMSTATE_UINT32(state_blobs.savestate.size, TPMEmulator),
VMSTATE_VBUFFER_ALLOC_UINT32(state_blobs.savestate.buffer,
TPMEmulator, 0, 0,
state_blobs.savestate.size),
VMSTATE_END_OF_LIST()
}
};
static void tpm_emulator_inst_init(Object *obj)
{
TPMEmulator *tpm_emu = TPM_EMULATOR(obj);
trace_tpm_emulator_inst_init();
tpm_emu->options = g_new0(TPMEmulatorOptions, 1);
tpm_emu->cur_locty_number = ~0;
qemu_mutex_init(&tpm_emu->mutex);
vmstate_register(NULL, VMSTATE_INSTANCE_ID_ANY,
&vmstate_tpm_emulator, obj);
}
/*
* Gracefully shut down the external TPM
*/
static void tpm_emulator_shutdown(TPMEmulator *tpm_emu)
{
ptm_res res;
if (tpm_emulator_ctrlcmd(tpm_emu, CMD_SHUTDOWN, &res, 0, sizeof(res)) < 0) {
error_report("tpm-emulator: Could not cleanly shutdown the TPM: %s",
strerror(errno));
} else if (res != 0) {
error_report("tpm-emulator: TPM result for shutdown: 0x%x %s",
be32_to_cpu(res), tpm_emulator_strerror(be32_to_cpu(res)));
}
}
static void tpm_emulator_inst_finalize(Object *obj)
{
TPMEmulator *tpm_emu = TPM_EMULATOR(obj);
TPMBlobBuffers *state_blobs = &tpm_emu->state_blobs;
tpm_emulator_shutdown(tpm_emu);
object_unref(OBJECT(tpm_emu->data_ioc));
qemu_chr_fe_deinit(&tpm_emu->ctrl_chr, false);
qapi_free_TPMEmulatorOptions(tpm_emu->options);
if (tpm_emu->migration_blocker) {
migrate_del_blocker(tpm_emu->migration_blocker);
error_free(tpm_emu->migration_blocker);
}
tpm_sized_buffer_reset(&state_blobs->volatil);
tpm_sized_buffer_reset(&state_blobs->permanent);
tpm_sized_buffer_reset(&state_blobs->savestate);
qemu_mutex_destroy(&tpm_emu->mutex);
vmstate_unregister(NULL, &vmstate_tpm_emulator, obj);
}
static void tpm_emulator_class_init(ObjectClass *klass, void *data)
{
TPMBackendClass *tbc = TPM_BACKEND_CLASS(klass);
tbc->type = TPM_TYPE_EMULATOR;
tbc->opts = tpm_emulator_cmdline_opts;
tbc->desc = "TPM emulator backend driver";
tbc->create = tpm_emulator_create;
tbc->startup_tpm = tpm_emulator_startup_tpm;
tbc->cancel_cmd = tpm_emulator_cancel_cmd;
tbc->get_tpm_established_flag = tpm_emulator_get_tpm_established_flag;
tbc->reset_tpm_established_flag = tpm_emulator_reset_tpm_established_flag;
tbc->get_tpm_version = tpm_emulator_get_tpm_version;
tbc->get_buffer_size = tpm_emulator_get_buffer_size;
tbc->get_tpm_options = tpm_emulator_get_tpm_options;
tbc->handle_request = tpm_emulator_handle_request;
}
static const TypeInfo tpm_emulator_info = {
.name = TYPE_TPM_EMULATOR,
.parent = TYPE_TPM_BACKEND,
.instance_size = sizeof(TPMEmulator),
.class_init = tpm_emulator_class_init,
.instance_init = tpm_emulator_inst_init,
.instance_finalize = tpm_emulator_inst_finalize,
};
static void tpm_emulator_register(void)
{
type_register_static(&tpm_emulator_info);
}
type_init(tpm_emulator_register)

88
backends/tpm/tpm_int.h Normal file
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/*
* TPM configuration
*
* Copyright (C) 2011-2013 IBM Corporation
*
* Authors:
* Stefan Berger <stefanb@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef BACKENDS_TPM_INT_H
#define BACKENDS_TPM_INT_H
#include "qemu/option.h"
#include "sysemu/tpm.h"
#define TPM_STANDARD_CMDLINE_OPTS \
{ \
.name = "type", \
.type = QEMU_OPT_STRING, \
.help = "Type of TPM backend", \
}
struct tpm_req_hdr {
uint16_t tag;
uint32_t len;
uint32_t ordinal;
} QEMU_PACKED;
struct tpm_resp_hdr {
uint16_t tag;
uint32_t len;
uint32_t errcode;
} QEMU_PACKED;
#define TPM_TAG_RQU_COMMAND 0xc1
#define TPM_TAG_RQU_AUTH1_COMMAND 0xc2
#define TPM_TAG_RQU_AUTH2_COMMAND 0xc3
#define TPM_TAG_RSP_COMMAND 0xc4
#define TPM_TAG_RSP_AUTH1_COMMAND 0xc5
#define TPM_TAG_RSP_AUTH2_COMMAND 0xc6
#define TPM_BAD_PARAMETER 3
#define TPM_FAIL 9
#define TPM_KEYNOTFOUND 13
#define TPM_BAD_PARAM_SIZE 25
#define TPM_ENCRYPT_ERROR 32
#define TPM_DECRYPT_ERROR 33
#define TPM_BAD_KEY_PROPERTY 40
#define TPM_BAD_MODE 44
#define TPM_BAD_VERSION 46
#define TPM_BAD_LOCALITY 61
#define TPM_ORD_ContinueSelfTest 0x53
#define TPM_ORD_GetTicks 0xf1
#define TPM_ORD_GetCapability 0x65
#define TPM_CAP_PROPERTY 0x05
#define TPM_CAP_PROP_INPUT_BUFFER 0x124
/* TPM2 defines */
#define TPM2_ST_NO_SESSIONS 0x8001
#define TPM2_CC_ReadClock 0x00000181
#define TPM2_CC_GetCapability 0x0000017a
#define TPM2_CAP_TPM_PROPERTIES 0x6
#define TPM2_PT_MAX_COMMAND_SIZE 0x11e
#define TPM_RC_INSUFFICIENT 0x9a
#define TPM_RC_FAILURE 0x101
#define TPM_RC_LOCALITY 0x907
int tpm_util_get_buffer_size(int tpm_fd, TPMVersion tpm_version,
size_t *buffersize);
typedef struct TPMSizedBuffer {
uint32_t size;
uint8_t *buffer;
} TPMSizedBuffer;
void tpm_sized_buffer_reset(TPMSizedBuffer *tsb);
#endif /* BACKENDS_TPM_INT_H */

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/*
* tpm_ioctl.h
*
* (c) Copyright IBM Corporation 2014, 2015.
*
* This file is licensed under the terms of the 3-clause BSD license
*/
#ifndef TPM_IOCTL_H
#define TPM_IOCTL_H
#include <sys/uio.h>
#include <sys/ioctl.h>
/*
* Every response from a command involving a TPM command execution must hold
* the ptm_res as the first element.
* ptm_res corresponds to the error code of a command executed by the TPM.
*/
typedef uint32_t ptm_res;
/* PTM_GET_TPMESTABLISHED: get the establishment bit */
struct ptm_est {
union {
struct {
ptm_res tpm_result;
unsigned char bit; /* TPM established bit */
} resp; /* response */
} u;
};
/* PTM_RESET_TPMESTABLISHED: reset establishment bit */
struct ptm_reset_est {
union {
struct {
uint8_t loc; /* locality to use */
} req; /* request */
struct {
ptm_res tpm_result;
} resp; /* response */
} u;
};
/* PTM_INIT */
struct ptm_init {
union {
struct {
uint32_t init_flags; /* see definitions below */
} req; /* request */
struct {
ptm_res tpm_result;
} resp; /* response */
} u;
};
/* above init_flags */
#define PTM_INIT_FLAG_DELETE_VOLATILE (1 << 0)
/* delete volatile state file after reading it */
/* PTM_SET_LOCALITY */
struct ptm_loc {
union {
struct {
uint8_t loc; /* locality to set */
} req; /* request */
struct {
ptm_res tpm_result;
} resp; /* response */
} u;
};
/* PTM_HASH_DATA: hash given data */
struct ptm_hdata {
union {
struct {
uint32_t length;
uint8_t data[4096];
} req; /* request */
struct {
ptm_res tpm_result;
} resp; /* response */
} u;
};
/*
* size of the TPM state blob to transfer; x86_64 can handle 8k,
* ppc64le only ~7k; keep the response below a 4k page size
*/
#define PTM_STATE_BLOB_SIZE (3 * 1024)
/*
* The following is the data structure to get state blobs from the TPM.
* If the size of the state blob exceeds the PTM_STATE_BLOB_SIZE, multiple reads
* with this ioctl and with adjusted offset are necessary. All bytes
* must be transferred and the transfer is done once the last byte has been
* returned.
* It is possible to use the read() interface for reading the data; however, the
* first bytes of the state blob will be part of the response to the ioctl(); a
* subsequent read() is only necessary if the total length (totlength) exceeds
* the number of received bytes. seek() is not supported.
*/
struct ptm_getstate {
union {
struct {
uint32_t state_flags; /* may be: PTM_STATE_FLAG_DECRYPTED */
uint32_t type; /* which blob to pull */
uint32_t offset; /* offset from where to read */
} req; /* request */
struct {
ptm_res tpm_result;
uint32_t state_flags; /* may be: PTM_STATE_FLAG_ENCRYPTED */
uint32_t totlength; /* total length that will be transferred */
uint32_t length; /* number of bytes in following buffer */
uint8_t data[PTM_STATE_BLOB_SIZE];
} resp; /* response */
} u;
};
/* TPM state blob types */
#define PTM_BLOB_TYPE_PERMANENT 1
#define PTM_BLOB_TYPE_VOLATILE 2
#define PTM_BLOB_TYPE_SAVESTATE 3
/* state_flags above : */
#define PTM_STATE_FLAG_DECRYPTED 1 /* on input: get decrypted state */
#define PTM_STATE_FLAG_ENCRYPTED 2 /* on output: state is encrypted */
/*
* The following is the data structure to set state blobs in the TPM.
* If the size of the state blob exceeds the PTM_STATE_BLOB_SIZE, multiple
* 'writes' using this ioctl are necessary. The last packet is indicated
* by the length being smaller than the PTM_STATE_BLOB_SIZE.
* The very first packet may have a length indicator of '0' enabling
* a write() with all the bytes from a buffer. If the write() interface
* is used, a final ioctl with a non-full buffer must be made to indicate
* that all data were transferred (a write with 0 bytes would not work).
*/
struct ptm_setstate {
union {
struct {
uint32_t state_flags; /* may be PTM_STATE_FLAG_ENCRYPTED */
uint32_t type; /* which blob to set */
uint32_t length; /* length of the data;
use 0 on the first packet to
transfer using write() */
uint8_t data[PTM_STATE_BLOB_SIZE];
} req; /* request */
struct {
ptm_res tpm_result;
} resp; /* response */
} u;
};
/*
* PTM_GET_CONFIG: Data structure to get runtime configuration information
* such as which keys are applied.
*/
struct ptm_getconfig {
union {
struct {
ptm_res tpm_result;
uint32_t flags;
} resp; /* response */
} u;
};
#define PTM_CONFIG_FLAG_FILE_KEY 0x1
#define PTM_CONFIG_FLAG_MIGRATION_KEY 0x2
/*
* PTM_SET_BUFFERSIZE: Set the buffer size to be used by the TPM.
* A 0 on input queries for the current buffer size. Any other
* number will try to set the buffer size. The returned number is
* the buffer size that will be used, which can be larger than the
* requested one, if it was below the minimum, or smaller than the
* requested one, if it was above the maximum.
*/
struct ptm_setbuffersize {
union {
struct {
uint32_t buffersize; /* 0 to query for current buffer size */
} req; /* request */
struct {
ptm_res tpm_result;
uint32_t buffersize; /* buffer size in use */
uint32_t minsize; /* min. supported buffer size */
uint32_t maxsize; /* max. supported buffer size */
} resp; /* response */
} u;
};
typedef uint64_t ptm_cap;
typedef struct ptm_est ptm_est;
typedef struct ptm_reset_est ptm_reset_est;
typedef struct ptm_loc ptm_loc;
typedef struct ptm_hdata ptm_hdata;
typedef struct ptm_init ptm_init;
typedef struct ptm_getstate ptm_getstate;
typedef struct ptm_setstate ptm_setstate;
typedef struct ptm_getconfig ptm_getconfig;
typedef struct ptm_setbuffersize ptm_setbuffersize;
/* capability flags returned by PTM_GET_CAPABILITY */
#define PTM_CAP_INIT (1)
#define PTM_CAP_SHUTDOWN (1 << 1)
#define PTM_CAP_GET_TPMESTABLISHED (1 << 2)
#define PTM_CAP_SET_LOCALITY (1 << 3)
#define PTM_CAP_HASHING (1 << 4)
#define PTM_CAP_CANCEL_TPM_CMD (1 << 5)
#define PTM_CAP_STORE_VOLATILE (1 << 6)
#define PTM_CAP_RESET_TPMESTABLISHED (1 << 7)
#define PTM_CAP_GET_STATEBLOB (1 << 8)
#define PTM_CAP_SET_STATEBLOB (1 << 9)
#define PTM_CAP_STOP (1 << 10)
#define PTM_CAP_GET_CONFIG (1 << 11)
#define PTM_CAP_SET_DATAFD (1 << 12)
#define PTM_CAP_SET_BUFFERSIZE (1 << 13)
enum {
PTM_GET_CAPABILITY = _IOR('P', 0, ptm_cap),
PTM_INIT = _IOWR('P', 1, ptm_init),
PTM_SHUTDOWN = _IOR('P', 2, ptm_res),
PTM_GET_TPMESTABLISHED = _IOR('P', 3, ptm_est),
PTM_SET_LOCALITY = _IOWR('P', 4, ptm_loc),
PTM_HASH_START = _IOR('P', 5, ptm_res),
PTM_HASH_DATA = _IOWR('P', 6, ptm_hdata),
PTM_HASH_END = _IOR('P', 7, ptm_res),
PTM_CANCEL_TPM_CMD = _IOR('P', 8, ptm_res),
PTM_STORE_VOLATILE = _IOR('P', 9, ptm_res),
PTM_RESET_TPMESTABLISHED = _IOWR('P', 10, ptm_reset_est),
PTM_GET_STATEBLOB = _IOWR('P', 11, ptm_getstate),
PTM_SET_STATEBLOB = _IOWR('P', 12, ptm_setstate),
PTM_STOP = _IOR('P', 13, ptm_res),
PTM_GET_CONFIG = _IOR('P', 14, ptm_getconfig),
PTM_SET_DATAFD = _IOR('P', 15, ptm_res),
PTM_SET_BUFFERSIZE = _IOWR('P', 16, ptm_setbuffersize),
};
/*
* Commands used by the non-CUSE TPMs
*
* All messages container big-endian data.
*
* The return messages only contain the 'resp' part of the unions
* in the data structures above. Besides that the limits in the
* buffers above (ptm_hdata:u.req.data and ptm_get_state:u.resp.data
* and ptm_set_state:u.req.data) are 0xffffffff.
*/
enum {
CMD_GET_CAPABILITY = 1,
CMD_INIT,
CMD_SHUTDOWN,
CMD_GET_TPMESTABLISHED,
CMD_SET_LOCALITY,
CMD_HASH_START,
CMD_HASH_DATA,
CMD_HASH_END,
CMD_CANCEL_TPM_CMD,
CMD_STORE_VOLATILE,
CMD_RESET_TPMESTABLISHED,
CMD_GET_STATEBLOB,
CMD_SET_STATEBLOB,
CMD_STOP,
CMD_GET_CONFIG,
CMD_SET_DATAFD,
CMD_SET_BUFFERSIZE,
};
#endif /* TPM_IOCTL_H */

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backends/tpm/tpm_passthrough.c Normal file
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/*
* passthrough TPM driver
*
* Copyright (c) 2010 - 2013 IBM Corporation
* Authors:
* Stefan Berger <stefanb@us.ibm.com>
*
* Copyright (C) 2011 IAIK, Graz University of Technology
* Author: Andreas Niederl
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
#include "qemu/sockets.h"
#include "sysemu/tpm_backend.h"
#include "sysemu/tpm_util.h"
#include "tpm_int.h"
#include "qapi/clone-visitor.h"
#include "qapi/qapi-visit-tpm.h"
#include "trace.h"
#define TYPE_TPM_PASSTHROUGH "tpm-passthrough"
#define TPM_PASSTHROUGH(obj) \
OBJECT_CHECK(TPMPassthruState, (obj), TYPE_TPM_PASSTHROUGH)
/* data structures */
struct TPMPassthruState {
TPMBackend parent;
TPMPassthroughOptions *options;
const char *tpm_dev;
int tpm_fd;
bool tpm_executing;
bool tpm_op_canceled;
int cancel_fd;
TPMVersion tpm_version;
size_t tpm_buffersize;
};
typedef struct TPMPassthruState TPMPassthruState;
#define TPM_PASSTHROUGH_DEFAULT_DEVICE "/dev/tpm0"
/* functions */
static void tpm_passthrough_cancel_cmd(TPMBackend *tb);
static int tpm_passthrough_unix_read(int fd, uint8_t *buf, uint32_t len)
{
int ret;
reread:
ret = read(fd, buf, len);
if (ret < 0) {
if (errno != EINTR && errno != EAGAIN) {
return -1;
}
goto reread;
}
return ret;
}
static void tpm_passthrough_unix_tx_bufs(TPMPassthruState *tpm_pt,
const uint8_t *in, uint32_t in_len,
uint8_t *out, uint32_t out_len,
bool *selftest_done, Error **errp)
{
ssize_t ret;
bool is_selftest;
/* FIXME: protect shared variables or use other sync mechanism */
tpm_pt->tpm_op_canceled = false;
tpm_pt->tpm_executing = true;
*selftest_done = false;
is_selftest = tpm_util_is_selftest(in, in_len);
ret = qemu_write_full(tpm_pt->tpm_fd, in, in_len);
if (ret != in_len) {
if (!tpm_pt->tpm_op_canceled || errno != ECANCELED) {
error_setg_errno(errp, errno, "tpm_passthrough: error while "
"transmitting data to TPM");
}
goto err_exit;
}
tpm_pt->tpm_executing = false;
ret = tpm_passthrough_unix_read(tpm_pt->tpm_fd, out, out_len);
if (ret < 0) {
if (!tpm_pt->tpm_op_canceled || errno != ECANCELED) {
error_setg_errno(errp, errno, "tpm_passthrough: error while "
"reading data from TPM");
}
} else if (ret < sizeof(struct tpm_resp_hdr) ||
tpm_cmd_get_size(out) != ret) {
ret = -1;
error_setg_errno(errp, errno, "tpm_passthrough: received invalid "
"response packet from TPM");
}
if (is_selftest && (ret >= sizeof(struct tpm_resp_hdr))) {
*selftest_done = tpm_cmd_get_errcode(out) == 0;
}
err_exit:
if (ret < 0) {
tpm_util_write_fatal_error_response(out, out_len);
}
tpm_pt->tpm_executing = false;
}
static void tpm_passthrough_handle_request(TPMBackend *tb, TPMBackendCmd *cmd,
Error **errp)
{
TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(tb);
trace_tpm_passthrough_handle_request(cmd);
tpm_passthrough_unix_tx_bufs(tpm_pt, cmd->in, cmd->in_len,
cmd->out, cmd->out_len, &cmd->selftest_done,
errp);
}
static void tpm_passthrough_reset(TPMBackend *tb)
{
trace_tpm_passthrough_reset();
tpm_passthrough_cancel_cmd(tb);
}
static bool tpm_passthrough_get_tpm_established_flag(TPMBackend *tb)
{
return false;
}
static int tpm_passthrough_reset_tpm_established_flag(TPMBackend *tb,
uint8_t locty)
{
/* only a TPM 2.0 will support this */
return 0;
}
static void tpm_passthrough_cancel_cmd(TPMBackend *tb)
{
TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(tb);
int n;
/*
* As of Linux 3.7 the tpm_tis driver does not properly cancel
* commands on all TPM manufacturers' TPMs.
* Only cancel if we're busy so we don't cancel someone else's
* command, e.g., a command executed on the host.
*/
if (tpm_pt->tpm_executing) {
if (tpm_pt->cancel_fd >= 0) {
tpm_pt->tpm_op_canceled = true;
n = write(tpm_pt->cancel_fd, "-", 1);
if (n != 1) {
error_report("Canceling TPM command failed: %s",
strerror(errno));
}
} else {
error_report("Cannot cancel TPM command due to missing "
"TPM sysfs cancel entry");
}
}
}
static TPMVersion tpm_passthrough_get_tpm_version(TPMBackend *tb)
{
TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(tb);
return tpm_pt->tpm_version;
}
static size_t tpm_passthrough_get_buffer_size(TPMBackend *tb)
{
TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(tb);
int ret;
ret = tpm_util_get_buffer_size(tpm_pt->tpm_fd, tpm_pt->tpm_version,
&tpm_pt->tpm_buffersize);
if (ret < 0) {
tpm_pt->tpm_buffersize = 4096;
}
return tpm_pt->tpm_buffersize;
}
/*
* Unless path or file descriptor set has been provided by user,
* determine the sysfs cancel file following kernel documentation
* in Documentation/ABI/stable/sysfs-class-tpm.
* From /dev/tpm0 create /sys/class/tpm/tpm0/device/cancel
* before 4.0: /sys/class/misc/tpm0/device/cancel
*/
static int tpm_passthrough_open_sysfs_cancel(TPMPassthruState *tpm_pt)
{
int fd = -1;
char *dev;
char path[PATH_MAX];
if (tpm_pt->options->cancel_path) {
fd = qemu_open(tpm_pt->options->cancel_path, O_WRONLY);
if (fd < 0) {
error_report("tpm_passthrough: Could not open TPM cancel path: %s",
strerror(errno));
}
return fd;
}
dev = strrchr(tpm_pt->tpm_dev, '/');
if (!dev) {
error_report("tpm_passthrough: Bad TPM device path %s",
tpm_pt->tpm_dev);
return -1;
}
dev++;
if (snprintf(path, sizeof(path), "/sys/class/tpm/%s/device/cancel",
dev) < sizeof(path)) {
fd = qemu_open(path, O_WRONLY);
if (fd < 0) {
if (snprintf(path, sizeof(path), "/sys/class/misc/%s/device/cancel",
dev) < sizeof(path)) {
fd = qemu_open(path, O_WRONLY);
}
}
}
if (fd < 0) {
error_report("tpm_passthrough: Could not guess TPM cancel path");
} else {
tpm_pt->options->cancel_path = g_strdup(path);
}
return fd;
}
static int
tpm_passthrough_handle_device_opts(TPMPassthruState *tpm_pt, QemuOpts *opts)
{
const char *value;
value = qemu_opt_get(opts, "cancel-path");
if (value) {
tpm_pt->options->cancel_path = g_strdup(value);
tpm_pt->options->has_cancel_path = true;
}
value = qemu_opt_get(opts, "path");
if (value) {
tpm_pt->options->has_path = true;
tpm_pt->options->path = g_strdup(value);
}
tpm_pt->tpm_dev = value ? value : TPM_PASSTHROUGH_DEFAULT_DEVICE;
tpm_pt->tpm_fd = qemu_open(tpm_pt->tpm_dev, O_RDWR);
if (tpm_pt->tpm_fd < 0) {
error_report("Cannot access TPM device using '%s': %s",
tpm_pt->tpm_dev, strerror(errno));
return -1;
}
if (tpm_util_test_tpmdev(tpm_pt->tpm_fd, &tpm_pt->tpm_version)) {
error_report("'%s' is not a TPM device.",
tpm_pt->tpm_dev);
return -1;
}
tpm_pt->cancel_fd = tpm_passthrough_open_sysfs_cancel(tpm_pt);
if (tpm_pt->cancel_fd < 0) {
return -1;
}
return 0;
}
static TPMBackend *tpm_passthrough_create(QemuOpts *opts)
{
Object *obj = object_new(TYPE_TPM_PASSTHROUGH);
if (tpm_passthrough_handle_device_opts(TPM_PASSTHROUGH(obj), opts)) {
object_unref(obj);
return NULL;
}
return TPM_BACKEND(obj);
}
static int tpm_passthrough_startup_tpm(TPMBackend *tb, size_t buffersize)
{
TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(tb);
if (buffersize && buffersize < tpm_pt->tpm_buffersize) {
error_report("Requested buffer size of %zu is smaller than host TPM's "
"fixed buffer size of %zu",
buffersize, tpm_pt->tpm_buffersize);
return -1;
}
return 0;
}
static TpmTypeOptions *tpm_passthrough_get_tpm_options(TPMBackend *tb)
{
TpmTypeOptions *options = g_new0(TpmTypeOptions, 1);
options->type = TPM_TYPE_OPTIONS_KIND_PASSTHROUGH;
options->u.passthrough.data = QAPI_CLONE(TPMPassthroughOptions,
TPM_PASSTHROUGH(tb)->options);
return options;
}
static const QemuOptDesc tpm_passthrough_cmdline_opts[] = {
TPM_STANDARD_CMDLINE_OPTS,
{
.name = "cancel-path",
.type = QEMU_OPT_STRING,
.help = "Sysfs file entry for canceling TPM commands",
},
{
.name = "path",
.type = QEMU_OPT_STRING,
.help = "Path to TPM device on the host",
},
{ /* end of list */ },
};
static void tpm_passthrough_inst_init(Object *obj)
{
TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(obj);
tpm_pt->options = g_new0(TPMPassthroughOptions, 1);
tpm_pt->tpm_fd = -1;
tpm_pt->cancel_fd = -1;
}
static void tpm_passthrough_inst_finalize(Object *obj)
{
TPMPassthruState *tpm_pt = TPM_PASSTHROUGH(obj);
tpm_passthrough_cancel_cmd(TPM_BACKEND(obj));
if (tpm_pt->tpm_fd >= 0) {
qemu_close(tpm_pt->tpm_fd);
}
if (tpm_pt->cancel_fd >= 0) {
qemu_close(tpm_pt->cancel_fd);
}
qapi_free_TPMPassthroughOptions(tpm_pt->options);
}
static void tpm_passthrough_class_init(ObjectClass *klass, void *data)
{
TPMBackendClass *tbc = TPM_BACKEND_CLASS(klass);
tbc->type = TPM_TYPE_PASSTHROUGH;
tbc->opts = tpm_passthrough_cmdline_opts;
tbc->desc = "Passthrough TPM backend driver";
tbc->create = tpm_passthrough_create;
tbc->startup_tpm = tpm_passthrough_startup_tpm;
tbc->reset = tpm_passthrough_reset;
tbc->cancel_cmd = tpm_passthrough_cancel_cmd;
tbc->get_tpm_established_flag = tpm_passthrough_get_tpm_established_flag;
tbc->reset_tpm_established_flag =
tpm_passthrough_reset_tpm_established_flag;
tbc->get_tpm_version = tpm_passthrough_get_tpm_version;
tbc->get_buffer_size = tpm_passthrough_get_buffer_size;
tbc->get_tpm_options = tpm_passthrough_get_tpm_options;
tbc->handle_request = tpm_passthrough_handle_request;
}
static const TypeInfo tpm_passthrough_info = {
.name = TYPE_TPM_PASSTHROUGH,
.parent = TYPE_TPM_BACKEND,
.instance_size = sizeof(TPMPassthruState),
.class_init = tpm_passthrough_class_init,
.instance_init = tpm_passthrough_inst_init,
.instance_finalize = tpm_passthrough_inst_finalize,
};
static void tpm_passthrough_register(void)
{
type_register_static(&tpm_passthrough_info);
}
type_init(tpm_passthrough_register)

380
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/*
* TPM utility functions
*
* Copyright (c) 2010 - 2015 IBM Corporation
* Authors:
* Stefan Berger <stefanb@us.ibm.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>
*/
#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "qapi/visitor.h"
#include "tpm_int.h"
#include "exec/memory.h"
#include "hw/qdev-properties.h"
#include "sysemu/tpm_backend.h"
#include "sysemu/tpm_util.h"
#include "trace.h"
/* tpm backend property */
static void get_tpm(Object *obj, Visitor *v, const char *name, void *opaque,
Error **errp)
{
DeviceState *dev = DEVICE(obj);
TPMBackend **be = qdev_get_prop_ptr(dev, opaque);
char *p;
p = g_strdup(*be ? (*be)->id : "");
visit_type_str(v, name, &p, errp);
g_free(p);
}
static void set_tpm(Object *obj, Visitor *v, const char *name, void *opaque,
Error **errp)
{
DeviceState *dev = DEVICE(obj);
Error *local_err = NULL;
Property *prop = opaque;
TPMBackend *s, **be = qdev_get_prop_ptr(dev, prop);
char *str;
if (dev->realized) {
qdev_prop_set_after_realize(dev, name, errp);
return;
}
visit_type_str(v, name, &str, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
s = qemu_find_tpm_be(str);
if (s == NULL) {
error_setg(errp, "Property '%s.%s' can't find value '%s'",
object_get_typename(obj), prop->name, str);
} else if (tpm_backend_init(s, TPM_IF(obj), errp) == 0) {
*be = s; /* weak reference, avoid cyclic ref */
}
g_free(str);
}
static void release_tpm(Object *obj, const char *name, void *opaque)
{
DeviceState *dev = DEVICE(obj);
Property *prop = opaque;
TPMBackend **be = qdev_get_prop_ptr(dev, prop);
if (*be) {
tpm_backend_reset(*be);
}
}
const PropertyInfo qdev_prop_tpm = {
.name = "str",
.description = "ID of a tpm to use as a backend",
.get = get_tpm,
.set = set_tpm,
.release = release_tpm,
};
/*
* Write an error message in the given output buffer.
*/
void tpm_util_write_fatal_error_response(uint8_t *out, uint32_t out_len)
{
if (out_len >= sizeof(struct tpm_resp_hdr)) {
tpm_cmd_set_tag(out, TPM_TAG_RSP_COMMAND);
tpm_cmd_set_size(out, sizeof(struct tpm_resp_hdr));
tpm_cmd_set_error(out, TPM_FAIL);
}
}
bool tpm_util_is_selftest(const uint8_t *in, uint32_t in_len)
{
if (in_len >= sizeof(struct tpm_req_hdr)) {
return tpm_cmd_get_ordinal(in) == TPM_ORD_ContinueSelfTest;
}
return false;
}
/*
* Send request to a TPM device. We expect a response within one second.
*/
static int tpm_util_request(int fd,
const void *request,
size_t requestlen,
void *response,
size_t responselen)
{
fd_set readfds;
int n;
struct timeval tv = {
.tv_sec = 1,
.tv_usec = 0,
};
n = write(fd, request, requestlen);
if (n < 0) {
return -errno;
}
if (n != requestlen) {
return -EFAULT;
}
FD_ZERO(&readfds);
FD_SET(fd, &readfds);
/* wait for a second */
n = select(fd + 1, &readfds, NULL, NULL, &tv);
if (n != 1) {
return -errno;
}
n = read(fd, response, responselen);
if (n < sizeof(struct tpm_resp_hdr)) {
return -EFAULT;
}
/* check the header */
if (tpm_cmd_get_size(response) != n) {
return -EMSGSIZE;
}
return 0;
}
/*
* A basic test of a TPM device. We expect a well formatted response header
* (error response is fine).
*/
static int tpm_util_test(int fd,
const void *request,
size_t requestlen,
uint16_t *return_tag)
{
char buf[1024];
ssize_t ret;
ret = tpm_util_request(fd, request, requestlen,
buf, sizeof(buf));
if (ret < 0) {
return ret;
}
*return_tag = tpm_cmd_get_tag(buf);
return 0;
}
/*
* Probe for the TPM device in the back
* Returns 0 on success with the version of the probed TPM set, 1 on failure.
*/
int tpm_util_test_tpmdev(int tpm_fd, TPMVersion *tpm_version)
{
/*
* Sending a TPM1.2 command to a TPM2 should return a TPM1.2
* header (tag = 0xc4) and error code (TPM_BADTAG = 0x1e)
*
* Sending a TPM2 command to a TPM 2 will give a TPM 2 tag in the
* header.
* Sending a TPM2 command to a TPM 1.2 will give a TPM 1.2 tag
* in the header and an error code.
*/
const struct tpm_req_hdr test_req = {
.tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
.len = cpu_to_be32(sizeof(test_req)),
.ordinal = cpu_to_be32(TPM_ORD_GetTicks),
};
const struct tpm_req_hdr test_req_tpm2 = {
.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
.len = cpu_to_be32(sizeof(test_req_tpm2)),
.ordinal = cpu_to_be32(TPM2_CC_ReadClock),
};
uint16_t return_tag;
int ret;
/* Send TPM 2 command */
ret = tpm_util_test(tpm_fd, &test_req_tpm2,
sizeof(test_req_tpm2), &return_tag);
/* TPM 2 would respond with a tag of TPM2_ST_NO_SESSIONS */
if (!ret && return_tag == TPM2_ST_NO_SESSIONS) {
*tpm_version = TPM_VERSION_2_0;
return 0;
}
/* Send TPM 1.2 command */
ret = tpm_util_test(tpm_fd, &test_req,
sizeof(test_req), &return_tag);
if (!ret && return_tag == TPM_TAG_RSP_COMMAND) {
*tpm_version = TPM_VERSION_1_2;
/* this is a TPM 1.2 */
return 0;
}
*tpm_version = TPM_VERSION_UNSPEC;
return 1;
}
int tpm_util_get_buffer_size(int tpm_fd, TPMVersion tpm_version,
size_t *buffersize)
{
int ret;
switch (tpm_version) {
case TPM_VERSION_1_2: {
const struct tpm_req_get_buffer_size {
struct tpm_req_hdr hdr;
uint32_t capability;
uint32_t len;
uint32_t subcap;
} QEMU_PACKED tpm_get_buffer_size = {
.hdr = {
.tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
.len = cpu_to_be32(sizeof(tpm_get_buffer_size)),
.ordinal = cpu_to_be32(TPM_ORD_GetCapability),
},
.capability = cpu_to_be32(TPM_CAP_PROPERTY),
.len = cpu_to_be32(sizeof(uint32_t)),
.subcap = cpu_to_be32(TPM_CAP_PROP_INPUT_BUFFER),
};
struct tpm_resp_get_buffer_size {
struct tpm_resp_hdr hdr;
uint32_t len;
uint32_t buffersize;
} QEMU_PACKED tpm_resp;
ret = tpm_util_request(tpm_fd, &tpm_get_buffer_size,
sizeof(tpm_get_buffer_size),
&tpm_resp, sizeof(tpm_resp));
if (ret < 0) {
return ret;
}
if (be32_to_cpu(tpm_resp.hdr.len) != sizeof(tpm_resp) ||
be32_to_cpu(tpm_resp.len) != sizeof(uint32_t)) {
trace_tpm_util_get_buffer_size_hdr_len(
be32_to_cpu(tpm_resp.hdr.len),
sizeof(tpm_resp));
trace_tpm_util_get_buffer_size_len(be32_to_cpu(tpm_resp.len),
sizeof(uint32_t));
error_report("tpm_util: Got unexpected response to "
"TPM_GetCapability; errcode: 0x%x",
be32_to_cpu(tpm_resp.hdr.errcode));
return -EFAULT;
}
*buffersize = be32_to_cpu(tpm_resp.buffersize);
break;
}
case TPM_VERSION_2_0: {
const struct tpm2_req_get_buffer_size {
struct tpm_req_hdr hdr;
uint32_t capability;
uint32_t property;
uint32_t count;
} QEMU_PACKED tpm2_get_buffer_size = {
.hdr = {
.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
.len = cpu_to_be32(sizeof(tpm2_get_buffer_size)),
.ordinal = cpu_to_be32(TPM2_CC_GetCapability),
},
.capability = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES),
.property = cpu_to_be32(TPM2_PT_MAX_COMMAND_SIZE),
.count = cpu_to_be32(2), /* also get TPM2_PT_MAX_RESPONSE_SIZE */
};
struct tpm2_resp_get_buffer_size {
struct tpm_resp_hdr hdr;
uint8_t more;
uint32_t capability;
uint32_t count;
uint32_t property1;
uint32_t value1;
uint32_t property2;
uint32_t value2;
} QEMU_PACKED tpm2_resp;
ret = tpm_util_request(tpm_fd, &tpm2_get_buffer_size,
sizeof(tpm2_get_buffer_size),
&tpm2_resp, sizeof(tpm2_resp));
if (ret < 0) {
return ret;
}
if (be32_to_cpu(tpm2_resp.hdr.len) != sizeof(tpm2_resp) ||
be32_to_cpu(tpm2_resp.count) != 2) {
trace_tpm_util_get_buffer_size_hdr_len2(
be32_to_cpu(tpm2_resp.hdr.len),
sizeof(tpm2_resp));
trace_tpm_util_get_buffer_size_len2(
be32_to_cpu(tpm2_resp.count), 2);
error_report("tpm_util: Got unexpected response to "
"TPM2_GetCapability; errcode: 0x%x",
be32_to_cpu(tpm2_resp.hdr.errcode));
return -EFAULT;
}
*buffersize = MAX(be32_to_cpu(tpm2_resp.value1),
be32_to_cpu(tpm2_resp.value2));
break;
}
case TPM_VERSION_UNSPEC:
return -EFAULT;
}
trace_tpm_util_get_buffer_size(*buffersize);
return 0;
}
void tpm_sized_buffer_reset(TPMSizedBuffer *tsb)
{
g_free(tsb->buffer);
tsb->buffer = NULL;
tsb->size = 0;
}
void tpm_util_show_buffer(const unsigned char *buffer,
size_t buffer_size, const char *string)
{
size_t len, i;
char *line_buffer, *p;
if (!trace_event_get_state_backends(TRACE_TPM_UTIL_SHOW_BUFFER)) {
return;
}
len = MIN(tpm_cmd_get_size(buffer), buffer_size);
/*
* allocate enough room for 3 chars per buffer entry plus a
* newline after every 16 chars and a final null terminator.
*/
line_buffer = g_malloc(len * 3 + (len / 16) + 1);
for (i = 0, p = line_buffer; i < len; i++) {
if (i && !(i % 16)) {
p += sprintf(p, "\n");
}
p += sprintf(p, "%.2X ", buffer[i]);
}
trace_tpm_util_show_buffer(string, len, line_buffer);
g_free(line_buffer);
}

33
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# See docs/devel/tracing.txt for syntax documentation.
# tpm_passthrough.c
tpm_passthrough_handle_request(void *cmd) "processing command %p"
tpm_passthrough_reset(void) "reset"
# tpm_util.c
tpm_util_get_buffer_size_hdr_len(uint32_t len, size_t expected) "tpm_resp->hdr.len = %u, expected = %zu"
tpm_util_get_buffer_size_len(uint32_t len, size_t expected) "tpm_resp->len = %u, expected = %zu"
tpm_util_get_buffer_size_hdr_len2(uint32_t len, size_t expected) "tpm2_resp->hdr.len = %u, expected = %zu"
tpm_util_get_buffer_size_len2(uint32_t len, size_t expected) "tpm2_resp->len = %u, expected = %zu"
tpm_util_get_buffer_size(size_t len) "buffersize of device: %zu"
tpm_util_show_buffer(const char *direction, size_t len, const char *buf) "direction: %s len: %zu\n%s"
# tpm_emulator.c
tpm_emulator_set_locality(uint8_t locty) "setting locality to %d"
tpm_emulator_handle_request(void) "processing TPM command"
tpm_emulator_probe_caps(uint64_t caps) "capabilities: 0x%"PRIx64
tpm_emulator_set_buffer_size(uint32_t buffersize, uint32_t minsize, uint32_t maxsize) "buffer size: %u, min: %u, max: %u"
tpm_emulator_startup_tpm_resume(bool is_resume, size_t buffersize) "is_resume: %d, buffer size: %zu"
tpm_emulator_get_tpm_established_flag(uint8_t flag) "got established flag: %d"
tpm_emulator_cancel_cmd_not_supt(void) "Backend does not support CANCEL_TPM_CMD"
tpm_emulator_handle_device_opts_tpm12(void) "TPM Version 1.2"
tpm_emulator_handle_device_opts_tpm2(void) "TPM Version 2"
tpm_emulator_handle_device_opts_unspec(void) "TPM Version Unspecified"
tpm_emulator_handle_device_opts_startup_error(void) "Startup error"
tpm_emulator_get_state_blob(uint8_t type, uint32_t size, uint32_t flags) "got state blob type %d, %u bytes, flags 0x%08x"
tpm_emulator_set_state_blob(uint8_t type, uint32_t size, uint32_t flags) "set state blob type %d, %u bytes, flags 0x%08x"
tpm_emulator_set_state_blobs(void) "setting state blobs"
tpm_emulator_set_state_blobs_error(const char *msg) "error while setting state blobs: %s"
tpm_emulator_set_state_blobs_done(void) "Done setting state blobs"
tpm_emulator_pre_save(void) ""
tpm_emulator_inst_init(void) ""