| /* |
| * 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 2.1 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 "qemu/lockable.h" |
| #include "io/channel-socket.h" |
| #include "sysemu/runstate.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" |
| #include "qom/object.h" |
| |
| #define TYPE_TPM_EMULATOR "tpm-emulator" |
| OBJECT_DECLARE_SIMPLE_TYPE(TPMEmulator, 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; |
| |
| 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; |
| |
| bool relock_storage; |
| VMChangeStateEntry *vmstate; |
| }; |
| |
| 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; |
| |
| WITH_QEMU_LOCK_GUARD(&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) { |
| return -1; |
| } |
| |
| if (msg_len_out != 0) { |
| n = qemu_chr_fe_read_all(dev, msg, msg_len_out); |
| if (n <= 0) { |
| return -1; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| 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_lock_storage(TPMEmulator *tpm_emu) |
| { |
| ptm_lockstorage pls; |
| |
| if (!TPM_EMULATOR_IMPLEMENTS_ALL_CAPS(tpm_emu, PTM_CAP_LOCK_STORAGE)) { |
| trace_tpm_emulator_lock_storage_cmd_not_supt(); |
| return 0; |
| } |
| |
| /* give failing side 300 * 10ms time to release lock */ |
| pls.u.req.retries = cpu_to_be32(300); |
| if (tpm_emulator_ctrlcmd(tpm_emu, CMD_LOCK_STORAGE, &pls, |
| sizeof(pls.u.req), sizeof(pls.u.resp)) < 0) { |
| error_report("tpm-emulator: Could not lock storage within 3 seconds: " |
| "%s", strerror(errno)); |
| return -1; |
| } |
| |
| pls.u.resp.tpm_result = be32_to_cpu(pls.u.resp.tpm_result); |
| if (pls.u.resp.tpm_result != 0) { |
| error_report("tpm-emulator: TPM result for CMD_LOCK_STORAGE: 0x%x %s", |
| pls.u.resp.tpm_result, |
| tpm_emulator_strerror(pls.u.resp.tpm_result)); |
| 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) |
| { |
| /* TPM startup will be done from post_load hook */ |
| if (runstate_check(RUN_STATE_INMIGRATE)) { |
| if (buffersize != 0) { |
| return tpm_emulator_set_buffer_size(tb, buffersize, NULL); |
| } |
| |
| return 0; |
| } |
| |
| 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"); |
| if (migrate_add_blocker(tpm_emu->migration_blocker, &err) < 0) { |
| 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 (qemu_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; |
| } |
| |
| close(fds[1]); |
| |
| return 0; |
| |
| err_exit: |
| close(fds[0]); |
| close(fds[1]); |
| return -1; |
| } |
| |
| static int tpm_emulator_handle_device_opts(TPMEmulator *tpm_emu, QemuOpts *opts) |
| { |
| const char *value; |
| Error *err = NULL; |
| Chardev *dev; |
| |
| value = qemu_opt_get(opts, "chardev"); |
| if (!value) { |
| error_report("tpm-emulator: parameter 'chardev' is missing"); |
| goto err; |
| } |
| |
| 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_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); |
| int ret; |
| |
| trace_tpm_emulator_pre_save(); |
| |
| tpm_backend_finish_sync(tb); |
| |
| /* get the state blobs from the TPM */ |
| ret = tpm_emulator_get_state_blobs(tpm_emu); |
| |
| tpm_emu->relock_storage = ret == 0; |
| |
| return ret; |
| } |
| |
| static void tpm_emulator_vm_state_change(void *opaque, bool running, |
| RunState state) |
| { |
| TPMBackend *tb = opaque; |
| TPMEmulator *tpm_emu = TPM_EMULATOR(tb); |
| |
| trace_tpm_emulator_vm_state_change(running, state); |
| |
| if (!running || state != RUN_STATE_RUNNING || !tpm_emu->relock_storage) { |
| return; |
| } |
| |
| /* lock storage after migration fall-back */ |
| tpm_emulator_lock_storage(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); |
| tpm_emu->vmstate = |
| qemu_add_vm_change_state_handler(tpm_emulator_vm_state_change, |
| tpm_emu); |
| |
| 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_emu->options->chardev) { |
| /* was never properly initialized */ |
| return; |
| } |
| |
| 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); |
| qemu_del_vm_change_state_handler(tpm_emu->vmstate); |
| |
| 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) |
