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/*
* Minimal TPM emulator for TPM test cases
*
* Copyright (c) 2018 Red Hat, Inc.
*
* Authors:
* Marc-André Lureau <marcandre.lureau@redhat.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.
*/
#include "qemu/osdep.h"
#include <glib/gstdio.h>
#include "hw/tpm/tpm_ioctl.h"
#include "io/channel-socket.h"
#include "qapi/error.h"
#include "tpm-emu.h"
void tpm_emu_test_wait_cond(TestState *s)
{
gint64 end_time = g_get_monotonic_time() + 5 * G_TIME_SPAN_SECOND;
g_mutex_lock(&s->data_mutex);
if (!s->data_cond_signal &&
!g_cond_wait_until(&s->data_cond, &s->data_mutex, end_time)) {
g_assert_not_reached();
}
s->data_cond_signal = false;
g_mutex_unlock(&s->data_mutex);
}
static void *tpm_emu_tpm_thread(void *data)
{
TestState *s = data;
QIOChannel *ioc = s->tpm_ioc;
s->tpm_msg = g_new(struct tpm_hdr, 1);
while (true) {
int minhlen = sizeof(s->tpm_msg->tag) + sizeof(s->tpm_msg->len);
if (!qio_channel_read(ioc, (char *)s->tpm_msg, minhlen, &error_abort)) {
break;
}
s->tpm_msg->tag = be16_to_cpu(s->tpm_msg->tag);
s->tpm_msg->len = be32_to_cpu(s->tpm_msg->len);
g_assert_cmpint(s->tpm_msg->len, >=, minhlen);
g_assert_cmpint(s->tpm_msg->tag, ==, TPM2_ST_NO_SESSIONS);
s->tpm_msg = g_realloc(s->tpm_msg, s->tpm_msg->len);
qio_channel_read(ioc, (char *)&s->tpm_msg->code,
s->tpm_msg->len - minhlen, &error_abort);
s->tpm_msg->code = be32_to_cpu(s->tpm_msg->code);
/* reply error */
s->tpm_msg->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
s->tpm_msg->len = cpu_to_be32(sizeof(struct tpm_hdr));
s->tpm_msg->code = cpu_to_be32(TPM_RC_FAILURE);
qio_channel_write(ioc, (char *)s->tpm_msg, be32_to_cpu(s->tpm_msg->len),
&error_abort);
}
g_free(s->tpm_msg);
s->tpm_msg = NULL;
object_unref(OBJECT(s->tpm_ioc));
return NULL;
}
void *tpm_emu_ctrl_thread(void *data)
{
TestState *s = data;
QIOChannelSocket *lioc = qio_channel_socket_new();
QIOChannel *ioc;
qio_channel_socket_listen_sync(lioc, s->addr, &error_abort);
g_mutex_lock(&s->data_mutex);
s->data_cond_signal = true;
g_mutex_unlock(&s->data_mutex);
g_cond_signal(&s->data_cond);
qio_channel_wait(QIO_CHANNEL(lioc), G_IO_IN);
ioc = QIO_CHANNEL(qio_channel_socket_accept(lioc, &error_abort));
g_assert(ioc);
{
uint32_t cmd = 0;
struct iovec iov = { .iov_base = &cmd, .iov_len = sizeof(cmd) };
int *pfd = NULL;
size_t nfd = 0;
qio_channel_readv_full(ioc, &iov, 1, &pfd, &nfd, &error_abort);
cmd = be32_to_cpu(cmd);
g_assert_cmpint(cmd, ==, CMD_SET_DATAFD);
g_assert_cmpint(nfd, ==, 1);
s->tpm_ioc = QIO_CHANNEL(qio_channel_socket_new_fd(*pfd, &error_abort));
g_free(pfd);
cmd = 0;
qio_channel_write(ioc, (char *)&cmd, sizeof(cmd), &error_abort);
s->emu_tpm_thread = g_thread_new(NULL, tpm_emu_tpm_thread, s);
}
while (true) {
uint32_t cmd;
ssize_t ret;
ret = qio_channel_read(ioc, (char *)&cmd, sizeof(cmd), NULL);
if (ret <= 0) {
break;
}
cmd = be32_to_cpu(cmd);
switch (cmd) {
case CMD_GET_CAPABILITY: {
ptm_cap cap = cpu_to_be64(0x3fff);
qio_channel_write(ioc, (char *)&cap, sizeof(cap), &error_abort);
break;
}
case CMD_INIT: {
ptm_init init;
qio_channel_read(ioc, (char *)&init.u.req, sizeof(init.u.req),
&error_abort);
init.u.resp.tpm_result = 0;
qio_channel_write(ioc, (char *)&init.u.resp, sizeof(init.u.resp),
&error_abort);
break;
}
case CMD_SHUTDOWN: {
ptm_res res = 0;
qio_channel_write(ioc, (char *)&res, sizeof(res), &error_abort);
/* the tpm data thread is expected to finish now */
g_thread_join(s->emu_tpm_thread);
break;
}
case CMD_STOP: {
ptm_res res = 0;
qio_channel_write(ioc, (char *)&res, sizeof(res), &error_abort);
break;
}
case CMD_SET_BUFFERSIZE: {
ptm_setbuffersize sbs;
qio_channel_read(ioc, (char *)&sbs.u.req, sizeof(sbs.u.req),
&error_abort);
sbs.u.resp.buffersize = sbs.u.req.buffersize ?: cpu_to_be32(4096);
sbs.u.resp.tpm_result = 0;
sbs.u.resp.minsize = cpu_to_be32(128);
sbs.u.resp.maxsize = cpu_to_be32(4096);
qio_channel_write(ioc, (char *)&sbs.u.resp, sizeof(sbs.u.resp),
&error_abort);
break;
}
case CMD_SET_LOCALITY: {
ptm_loc loc;
/* Note: this time it's not u.req / u.resp... */
qio_channel_read(ioc, (char *)&loc, sizeof(loc), &error_abort);
g_assert_cmpint(loc.u.req.loc, ==, 0);
loc.u.resp.tpm_result = 0;
qio_channel_write(ioc, (char *)&loc, sizeof(loc), &error_abort);
break;
}
case CMD_GET_TPMESTABLISHED: {
ptm_est est = {
.u.resp.bit = 0,
};
qio_channel_write(ioc, (char *)&est, sizeof(est), &error_abort);
break;
}
default:
g_debug("unimplemented %u", cmd);
g_assert_not_reached();
}
}
object_unref(OBJECT(ioc));
object_unref(OBJECT(lioc));
return NULL;
}
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