tests/qtest/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 "backends/tpm/tpm_ioctl.h"
  17 #include "io/channel-socket.h"
  18 #include "qapi/error.h"
  19 #include "qapi/qmp/qlist.h"
  20 #include "qapi/qmp/qstring.h"
  21 #include "tpm-emu.h"
  22
  23 void tpm_emu_test_wait_cond(TPMTestState *s)
  24 {
  25     gint64 end_time = g_get_monotonic_time() + 5 * G_TIME_SPAN_SECOND;
  26
  27     g_mutex_lock(&s->data_mutex);
  28
  29     if (!s->data_cond_signal &&
  30         !g_cond_wait_until(&s->data_cond, &s->data_mutex, end_time)) {
  31         g_assert_not_reached();
  32     }
  33
  34     s->data_cond_signal = false;
  35
  36     g_mutex_unlock(&s->data_mutex);
  37 }
  38
  39 static void *tpm_emu_tpm_thread(void *data)
  40 {
  41     TPMTestState *s = data;
  42     QIOChannel *ioc = s->tpm_ioc;
  43
  44     s->tpm_msg = g_new(struct tpm_hdr, 1);
  45     while (true) {
  46         int minhlen = sizeof(s->tpm_msg->tag) + sizeof(s->tpm_msg->len);
  47
  48         if (!qio_channel_read(ioc, (char *)s->tpm_msg, minhlen, &error_abort)) {
  49             break;
  50         }
  51         s->tpm_msg->tag = be16_to_cpu(s->tpm_msg->tag);
  52         s->tpm_msg->len = be32_to_cpu(s->tpm_msg->len);
  53         g_assert_cmpint(s->tpm_msg->len, >=, minhlen);
  54
  55         s->tpm_msg = g_realloc(s->tpm_msg, s->tpm_msg->len);
  56         qio_channel_read(ioc, (char *)&s->tpm_msg->code,
  57                          s->tpm_msg->len - minhlen, &error_abort);
  58         s->tpm_msg->code = be32_to_cpu(s->tpm_msg->code);
  59
  60         /* reply error */
  61         switch (s->tpm_version) {
  62         case TPM_VERSION_2_0:
  63             s->tpm_msg->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
  64             s->tpm_msg->len = cpu_to_be32(sizeof(struct tpm_hdr));
  65             s->tpm_msg->code = cpu_to_be32(TPM_RC_FAILURE);
  66             break;
  67         case TPM_VERSION_1_2:
  68             s->tpm_msg->tag = cpu_to_be16(TPM_TAG_RSP_COMMAND);
  69             s->tpm_msg->len = cpu_to_be32(sizeof(struct tpm_hdr));
  70             s->tpm_msg->code = cpu_to_be32(TPM_FAIL);
  71             break;
  72         default:
  73             g_debug("unsupport TPM version %u", s->tpm_version);
  74             g_assert_not_reached();
  75         }
  76         qio_channel_write(ioc, (char *)s->tpm_msg, be32_to_cpu(s->tpm_msg->len),
  77                           &error_abort);
  78     }
  79
  80     g_free(s->tpm_msg);
  81     s->tpm_msg = NULL;
  82     object_unref(OBJECT(s->tpm_ioc));
  83     return NULL;
  84 }
  85
  86 void *tpm_emu_ctrl_thread(void *data)
  87 {
  88     TPMTestState *s = data;
  89     QIOChannelSocket *lioc = qio_channel_socket_new();
  90     QIOChannel *ioc;
  91
  92     qio_channel_socket_listen_sync(lioc, s->addr, 1, &error_abort);
  93
  94     g_mutex_lock(&s->data_mutex);
  95     s->data_cond_signal = true;
  96     g_mutex_unlock(&s->data_mutex);
  97     g_cond_signal(&s->data_cond);
  98
  99     qio_channel_wait(QIO_CHANNEL(lioc), G_IO_IN);
 100     ioc = QIO_CHANNEL(qio_channel_socket_accept(lioc, &error_abort));
 101     g_assert(ioc);
 102
 103     {
 104         uint32_t cmd = 0;
 105         struct iovec iov = { .iov_base = &cmd, .iov_len = sizeof(cmd) };
 106         int *pfd = NULL;
 107         size_t nfd = 0;
 108
 109         qio_channel_readv_full(ioc, &iov, 1, &pfd, &nfd, &error_abort);
 110         cmd = be32_to_cpu(cmd);
 111         g_assert_cmpint(cmd, ==, CMD_SET_DATAFD);
 112         g_assert_cmpint(nfd, ==, 1);
 113         s->tpm_ioc = QIO_CHANNEL(qio_channel_socket_new_fd(*pfd, &error_abort));
 114         g_free(pfd);
 115
 116         cmd = 0;
 117         qio_channel_write(ioc, (char *)&cmd, sizeof(cmd), &error_abort);
 118
 119         s->emu_tpm_thread = g_thread_new(NULL, tpm_emu_tpm_thread, s);
 120     }
 121
 122     while (true) {
 123         uint32_t cmd;
 124         ssize_t ret;
 125
 126         ret = qio_channel_read(ioc, (char *)&cmd, sizeof(cmd), NULL);
 127         if (ret <= 0) {
 128             break;
 129         }
 130
 131         cmd = be32_to_cpu(cmd);
 132         switch (cmd) {
 133         case CMD_GET_CAPABILITY: {
 134             ptm_cap cap = cpu_to_be64(0x3fff);
 135             qio_channel_write(ioc, (char *)&cap, sizeof(cap), &error_abort);
 136             break;
 137         }
 138         case CMD_INIT: {
 139             ptm_init init;
 140             qio_channel_read(ioc, (char *)&init.u.req, sizeof(init.u.req),
 141                               &error_abort);
 142             init.u.resp.tpm_result = 0;
 143             qio_channel_write(ioc, (char *)&init.u.resp, sizeof(init.u.resp),
 144                               &error_abort);
 145             break;
 146         }
 147         case CMD_SHUTDOWN: {
 148             ptm_res res = 0;
 149             qio_channel_write(ioc, (char *)&res, sizeof(res), &error_abort);
 150             /* the tpm data thread is expected to finish now */
 151             g_thread_join(s->emu_tpm_thread);
 152             break;
 153         }
 154         case CMD_STOP: {
 155             ptm_res res = 0;
 156             qio_channel_write(ioc, (char *)&res, sizeof(res), &error_abort);
 157             break;
 158         }
 159         case CMD_SET_BUFFERSIZE: {
 160             ptm_setbuffersize sbs;
 161             qio_channel_read(ioc, (char *)&sbs.u.req, sizeof(sbs.u.req),
 162                              &error_abort);
 163             sbs.u.resp.buffersize = sbs.u.req.buffersize ?: cpu_to_be32(4096);
 164             sbs.u.resp.tpm_result = 0;
 165             sbs.u.resp.minsize = cpu_to_be32(128);
 166             sbs.u.resp.maxsize = cpu_to_be32(4096);
 167             qio_channel_write(ioc, (char *)&sbs.u.resp, sizeof(sbs.u.resp),
 168                               &error_abort);
 169             break;
 170         }
 171         case CMD_SET_LOCALITY: {
 172             ptm_loc loc;
 173             /* Note: this time it's not u.req / u.resp... */
 174             qio_channel_read(ioc, (char *)&loc, sizeof(loc), &error_abort);
 175             g_assert_cmpint(loc.u.req.loc, ==, 0);
 176             loc.u.resp.tpm_result = 0;
 177             qio_channel_write(ioc, (char *)&loc, sizeof(loc), &error_abort);
 178             break;
 179         }
 180         case CMD_GET_TPMESTABLISHED: {
 181             ptm_est est = {
 182                 .u.resp.bit = 0,
 183             };
 184             qio_channel_write(ioc, (char *)&est, sizeof(est), &error_abort);
 185             break;
 186         }
 187         default:
 188             g_debug("unimplemented %u", cmd);
 189             g_assert_not_reached();
 190         }
 191     }
 192
 193     object_unref(OBJECT(ioc));
 194     object_unref(OBJECT(lioc));
 195     return NULL;
 196 }
 197
 198 bool tpm_model_is_available(const char *args, const char *tpm_if)
 199 {
 200     QTestState *qts;
 201     QDict *rsp_tpm;
 202     bool ret = false;
 203
 204     qts = qtest_init(args);
 205     if (!qts) {
 206         return false;
 207     }
 208
 209     rsp_tpm = qtest_qmp(qts, "{ 'execute': 'query-tpm'}");
 210     if (!qdict_haskey(rsp_tpm, "error")) {
 211         QDict *rsp_models = qtest_qmp(qts,
 212                                       "{ 'execute': 'query-tpm-models'}");
 213         if (qdict_haskey(rsp_models, "return")) {
 214             QList *models = qdict_get_qlist(rsp_models, "return");
 215             QListEntry *e;
 216
 217             QLIST_FOREACH_ENTRY(models, e) {
 218                 QString *s = qobject_to(QString, qlist_entry_obj(e));
 219                 const char *ename = qstring_get_str(s);
 220                 if (!strcmp(ename, tpm_if)) {
 221                     ret = true;
 222                     break;
 223                 }
 224             }
 225         }
 226         qobject_unref(rsp_models);
 227     }
 228     qobject_unref(rsp_tpm);
 229     qtest_quit(qts);
 230
 231     return ret;
 232 }