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 27 if (!s->data_cond_signal && 28 !g_cond_wait_until(&s->data_cond, &s->data_mutex, end_time)) { 29 g_assert_not_reached(); 30 } 31 32 s->data_cond_signal = false; 33 34 g_mutex_unlock(&s->data_mutex); 35 } 36 37 static void *tpm_emu_tpm_thread(void *data) 38 { 39 TestState *s = data; 40 QIOChannel *ioc = s->tpm_ioc; 41 42 s->tpm_msg = g_new(struct tpm_hdr, 1); 43 while (true) { 44 int minhlen = sizeof(s->tpm_msg->tag) + sizeof(s->tpm_msg->len); 45 46 if (!qio_channel_read(ioc, (char *)s->tpm_msg, minhlen, &error_abort)) { 47 break; 48 } 49 s->tpm_msg->tag = be16_to_cpu(s->tpm_msg->tag); 50 s->tpm_msg->len = be32_to_cpu(s->tpm_msg->len); 51 g_assert_cmpint(s->tpm_msg->len, >=, minhlen); 52 g_assert_cmpint(s->tpm_msg->tag, ==, TPM2_ST_NO_SESSIONS); 53 54 s->tpm_msg = g_realloc(s->tpm_msg, s->tpm_msg->len); 55 qio_channel_read(ioc, (char *)&s->tpm_msg->code, 56 s->tpm_msg->len - minhlen, &error_abort); 57 s->tpm_msg->code = be32_to_cpu(s->tpm_msg->code); 58 59 /* reply error */ 60 s->tpm_msg->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS); 61 s->tpm_msg->len = cpu_to_be32(sizeof(struct tpm_hdr)); 62 s->tpm_msg->code = cpu_to_be32(TPM_RC_FAILURE); 63 qio_channel_write(ioc, (char *)s->tpm_msg, be32_to_cpu(s->tpm_msg->len), 64 &error_abort); 65 } 66 67 g_free(s->tpm_msg); 68 s->tpm_msg = NULL; 69 object_unref(OBJECT(s->tpm_ioc)); 70 return NULL; 71 } 72 73 void *tpm_emu_ctrl_thread(void *data) 74 { 75 TestState *s = data; 76 QIOChannelSocket *lioc = qio_channel_socket_new(); 77 QIOChannel *ioc; 78 79 qio_channel_socket_listen_sync(lioc, s->addr, 1, &error_abort); 80 81 g_mutex_lock(&s->data_mutex); 82 s->data_cond_signal = true; 83 g_mutex_unlock(&s->data_mutex); 84 g_cond_signal(&s->data_cond); 85 86 qio_channel_wait(QIO_CHANNEL(lioc), G_IO_IN); 87 ioc = QIO_CHANNEL(qio_channel_socket_accept(lioc, &error_abort)); 88 g_assert(ioc); 89 90 { 91 uint32_t cmd = 0; 92 struct iovec iov = { .iov_base = &cmd, .iov_len = sizeof(cmd) }; 93 int *pfd = NULL; 94 size_t nfd = 0; 95 96 qio_channel_readv_full(ioc, &iov, 1, &pfd, &nfd, &error_abort); 97 cmd = be32_to_cpu(cmd); 98 g_assert_cmpint(cmd, ==, CMD_SET_DATAFD); 99 g_assert_cmpint(nfd, ==, 1); 100 s->tpm_ioc = QIO_CHANNEL(qio_channel_socket_new_fd(*pfd, &error_abort)); 101 g_free(pfd); 102 103 cmd = 0; 104 qio_channel_write(ioc, (char *)&cmd, sizeof(cmd), &error_abort); 105 106 s->emu_tpm_thread = g_thread_new(NULL, tpm_emu_tpm_thread, s); 107 } 108 109 while (true) { 110 uint32_t cmd; 111 ssize_t ret; 112 113 ret = qio_channel_read(ioc, (char *)&cmd, sizeof(cmd), NULL); 114 if (ret <= 0) { 115 break; 116 } 117 118 cmd = be32_to_cpu(cmd); 119 switch (cmd) { 120 case CMD_GET_CAPABILITY: { 121 ptm_cap cap = cpu_to_be64(0x3fff); 122 qio_channel_write(ioc, (char *)&cap, sizeof(cap), &error_abort); 123 break; 124 } 125 case CMD_INIT: { 126 ptm_init init; 127 qio_channel_read(ioc, (char *)&init.u.req, sizeof(init.u.req), 128 &error_abort); 129 init.u.resp.tpm_result = 0; 130 qio_channel_write(ioc, (char *)&init.u.resp, sizeof(init.u.resp), 131 &error_abort); 132 break; 133 } 134 case CMD_SHUTDOWN: { 135 ptm_res res = 0; 136 qio_channel_write(ioc, (char *)&res, sizeof(res), &error_abort); 137 /* the tpm data thread is expected to finish now */ 138 g_thread_join(s->emu_tpm_thread); 139 break; 140 } 141 case CMD_STOP: { 142 ptm_res res = 0; 143 qio_channel_write(ioc, (char *)&res, sizeof(res), &error_abort); 144 break; 145 } 146 case CMD_SET_BUFFERSIZE: { 147 ptm_setbuffersize sbs; 148 qio_channel_read(ioc, (char *)&sbs.u.req, sizeof(sbs.u.req), 149 &error_abort); 150 sbs.u.resp.buffersize = sbs.u.req.buffersize ?: cpu_to_be32(4096); 151 sbs.u.resp.tpm_result = 0; 152 sbs.u.resp.minsize = cpu_to_be32(128); 153 sbs.u.resp.maxsize = cpu_to_be32(4096); 154 qio_channel_write(ioc, (char *)&sbs.u.resp, sizeof(sbs.u.resp), 155 &error_abort); 156 break; 157 } 158 case CMD_SET_LOCALITY: { 159 ptm_loc loc; 160 /* Note: this time it's not u.req / u.resp... */ 161 qio_channel_read(ioc, (char *)&loc, sizeof(loc), &error_abort); 162 g_assert_cmpint(loc.u.req.loc, ==, 0); 163 loc.u.resp.tpm_result = 0; 164 qio_channel_write(ioc, (char *)&loc, sizeof(loc), &error_abort); 165 break; 166 } 167 case CMD_GET_TPMESTABLISHED: { 168 ptm_est est = { 169 .u.resp.bit = 0, 170 }; 171 qio_channel_write(ioc, (char *)&est, sizeof(est), &error_abort); 172 break; 173 } 174 default: 175 g_debug("unimplemented %u", cmd); 176 g_assert_not_reached(); 177 } 178 } 179 180 object_unref(OBJECT(ioc)); 181 object_unref(OBJECT(lioc)); 182 return NULL; 183 } 184