tests/tpm-emu.c

   1 /*
   2  * Minimal TPM emulator for TPM test cases
   3  *
   4  * Copyright (c) 2018 Red Hat, Inc.
   5  *
   6  * Authors:
   7  *   Marc-André Lureau <marcandre.lureau@redhat.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  */
  12
  13 #include "qemu/osdep.h"
  14 #include <glib/gstdio.h>
  15
  16 #include "hw/tpm/tpm_ioctl.h"
  17 #include "io/channel-socket.h"
  18 #include "qapi/error.h"
  19 #include "tpm-emu.h"
  20
  21 void tpm_emu_test_wait_cond(TestState *s)
  22 {
  23     gint64 end_time = g_get_monotonic_time() + 5 * G_TIME_SPAN_SECOND;
  24
  25     g_mutex_lock(&s->data_mutex);
  26     if (!g_cond_wait_until(&s->data_cond, &s->data_mutex, end_time)) {
  27         g_assert_not_reached();
  28     }
  29     g_mutex_unlock(&s->data_mutex);
  30 }
  31
  32 static void *tpm_emu_tpm_thread(void *data)
  33 {
  34     TestState *s = data;
  35     QIOChannel *ioc = s->tpm_ioc;
  36
  37     s->tpm_msg = g_new(struct tpm_hdr, 1);
  38     while (true) {
  39         int minhlen = sizeof(s->tpm_msg->tag) + sizeof(s->tpm_msg->len);
  40
  41         if (!qio_channel_read(ioc, (char *)s->tpm_msg, minhlen, &error_abort)) {
  42             break;
  43         }
  44         s->tpm_msg->tag = be16_to_cpu(s->tpm_msg->tag);
  45         s->tpm_msg->len = be32_to_cpu(s->tpm_msg->len);
  46         g_assert_cmpint(s->tpm_msg->len, >=, minhlen);
  47         g_assert_cmpint(s->tpm_msg->tag, ==, TPM2_ST_NO_SESSIONS);
  48
  49         s->tpm_msg = g_realloc(s->tpm_msg, s->tpm_msg->len);
  50         qio_channel_read(ioc, (char *)&s->tpm_msg->code,
  51                          s->tpm_msg->len - minhlen, &error_abort);
  52         s->tpm_msg->code = be32_to_cpu(s->tpm_msg->code);
  53
  54         /* reply error */
  55         s->tpm_msg->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
  56         s->tpm_msg->len = cpu_to_be32(sizeof(struct tpm_hdr));
  57         s->tpm_msg->code = cpu_to_be32(TPM_RC_FAILURE);
  58         qio_channel_write(ioc, (char *)s->tpm_msg, be32_to_cpu(s->tpm_msg->len),
  59                           &error_abort);
  60     }
  61
  62     g_free(s->tpm_msg);
  63     s->tpm_msg = NULL;
  64     object_unref(OBJECT(s->tpm_ioc));
  65     return NULL;
  66 }
  67
  68 void *tpm_emu_ctrl_thread(void *data)
  69 {
  70     TestState *s = data;
  71     QIOChannelSocket *lioc = qio_channel_socket_new();
  72     QIOChannel *ioc;
  73
  74     qio_channel_socket_listen_sync(lioc, s->addr, &error_abort);
  75     g_cond_signal(&s->data_cond);
  76
  77     qio_channel_wait(QIO_CHANNEL(lioc), G_IO_IN);
  78     ioc = QIO_CHANNEL(qio_channel_socket_accept(lioc, &error_abort));
  79     g_assert(ioc);
  80
  81     {
  82         uint32_t cmd = 0;
  83         struct iovec iov = { .iov_base = &cmd, .iov_len = sizeof(cmd) };
  84         int *pfd = NULL;
  85         size_t nfd = 0;
  86
  87         qio_channel_readv_full(ioc, &iov, 1, &pfd, &nfd, &error_abort);
  88         cmd = be32_to_cpu(cmd);
  89         g_assert_cmpint(cmd, ==, CMD_SET_DATAFD);
  90         g_assert_cmpint(nfd, ==, 1);
  91         s->tpm_ioc = QIO_CHANNEL(qio_channel_socket_new_fd(*pfd, &error_abort));
  92         g_free(pfd);
  93
  94         cmd = 0;
  95         qio_channel_write(ioc, (char *)&cmd, sizeof(cmd), &error_abort);
  96
  97         s->emu_tpm_thread = g_thread_new(NULL, tpm_emu_tpm_thread, s);
  98     }
  99
 100     while (true) {
 101         uint32_t cmd;
 102         ssize_t ret;
 103
 104         ret = qio_channel_read(ioc, (char *)&cmd, sizeof(cmd), NULL);
 105         if (ret <= 0) {
 106             break;
 107         }
 108
 109         cmd = be32_to_cpu(cmd);
 110         switch (cmd) {
 111         case CMD_GET_CAPABILITY: {
 112             ptm_cap cap = cpu_to_be64(0x3fff);
 113             qio_channel_write(ioc, (char *)&cap, sizeof(cap), &error_abort);
 114             break;
 115         }
 116         case CMD_INIT: {
 117             ptm_init init;
 118             qio_channel_read(ioc, (char *)&init.u.req, sizeof(init.u.req),
 119                               &error_abort);
 120             init.u.resp.tpm_result = 0;
 121             qio_channel_write(ioc, (char *)&init.u.resp, sizeof(init.u.resp),
 122                               &error_abort);
 123             break;
 124         }
 125         case CMD_SHUTDOWN: {
 126             ptm_res res = 0;
 127             qio_channel_write(ioc, (char *)&res, sizeof(res), &error_abort);
 128             /* the tpm data thread is expected to finish now */
 129             g_thread_join(s->emu_tpm_thread);
 130             break;
 131         }
 132         case CMD_STOP: {
 133             ptm_res res = 0;
 134             qio_channel_write(ioc, (char *)&res, sizeof(res), &error_abort);
 135             break;
 136         }
 137         case CMD_SET_BUFFERSIZE: {
 138             ptm_setbuffersize sbs;
 139             qio_channel_read(ioc, (char *)&sbs.u.req, sizeof(sbs.u.req),
 140                              &error_abort);
 141             sbs.u.resp.buffersize = sbs.u.req.buffersize ?: cpu_to_be32(4096);
 142             sbs.u.resp.tpm_result = 0;
 143             sbs.u.resp.minsize = cpu_to_be32(128);
 144             sbs.u.resp.maxsize = cpu_to_be32(4096);
 145             qio_channel_write(ioc, (char *)&sbs.u.resp, sizeof(sbs.u.resp),
 146                               &error_abort);
 147             break;
 148         }
 149         case CMD_SET_LOCALITY: {
 150             ptm_loc loc;
 151             /* Note: this time it's not u.req / u.resp... */
 152             qio_channel_read(ioc, (char *)&loc, sizeof(loc), &error_abort);
 153             g_assert_cmpint(loc.u.req.loc, ==, 0);
 154             loc.u.resp.tpm_result = 0;
 155             qio_channel_write(ioc, (char *)&loc, sizeof(loc), &error_abort);
 156             break;
 157         }
 158         case CMD_GET_TPMESTABLISHED: {
 159             ptm_est est = {
 160                 .u.resp.bit = 0,
 161             };
 162             qio_channel_write(ioc, (char *)&est, sizeof(est), &error_abort);
 163             break;
 164         }
 165         default:
 166             g_debug("unimplemented %u", cmd);
 167             g_assert_not_reached();
 168         }
 169     }
 170
 171     object_unref(OBJECT(ioc));
 172     object_unref(OBJECT(lioc));
 173     return NULL;
 174 }