tpm.c

   1 /*
   2  * TPM configuration
   3  *
   4  * Copyright (C) 2011-2013 IBM Corporation
   5  *
   6  * Authors:
   7  *  Stefan Berger    <stefanb@us.ibm.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  * Based on net.c
  13  */
  14 #include "config-host.h"
  15
  16 #include "monitor/monitor.h"
  17 #include "qapi/qmp/qerror.h"
  18 #include "sysemu/tpm_backend.h"
  19 #include "sysemu/tpm.h"
  20 #include "qemu/config-file.h"
  21 #include "qmp-commands.h"
  22
  23 static QLIST_HEAD(, TPMBackend) tpm_backends =
  24     QLIST_HEAD_INITIALIZER(tpm_backends);
  25
  26
  27 #define TPM_MAX_MODELS      1
  28 #define TPM_MAX_DRIVERS     1
  29
  30 static TPMDriverOps const *be_drivers[TPM_MAX_DRIVERS] = {
  31     NULL,
  32 };
  33
  34 static enum TpmModel tpm_models[TPM_MAX_MODELS] = {
  35     -1,
  36 };
  37
  38 int tpm_register_model(enum TpmModel model)
  39 {
  40     int i;
  41
  42     for (i = 0; i < TPM_MAX_MODELS; i++) {
  43         if (tpm_models[i] == -1) {
  44             tpm_models[i] = model;
  45             return 0;
  46         }
  47     }
  48     error_report("Could not register TPM model");
  49     return 1;
  50 }
  51
  52 static bool tpm_model_is_registered(enum TpmModel model)
  53 {
  54     int i;
  55
  56     for (i = 0; i < TPM_MAX_MODELS; i++) {
  57         if (tpm_models[i] == model) {
  58             return true;
  59         }
  60     }
  61     return false;
  62 }
  63
  64 const TPMDriverOps *tpm_get_backend_driver(const char *type)
  65 {
  66     int i;
  67
  68     for (i = 0; i < TPM_MAX_DRIVERS && be_drivers[i] != NULL; i++) {
  69         if (!strcmp(TpmType_lookup[be_drivers[i]->type], type)) {
  70             return be_drivers[i];
  71         }
  72     }
  73
  74     return NULL;
  75 }
  76
  77 #ifdef CONFIG_TPM
  78
  79 int tpm_register_driver(const TPMDriverOps *tdo)
  80 {
  81     int i;
  82
  83     for (i = 0; i < TPM_MAX_DRIVERS; i++) {
  84         if (!be_drivers[i]) {
  85             be_drivers[i] = tdo;
  86             return 0;
  87         }
  88     }
  89     error_report("Could not register TPM driver");
  90     return 1;
  91 }
  92
  93 /*
  94  * Walk the list of available TPM backend drivers and display them on the
  95  * screen.
  96  */
  97 static void tpm_display_backend_drivers(void)
  98 {
  99     int i;
 100
 101     fprintf(stderr, "Supported TPM types (choose only one):\n");
 102
 103     for (i = 0; i < TPM_MAX_DRIVERS && be_drivers[i] != NULL; i++) {
 104         fprintf(stderr, "%12s   %s\n",
 105                 TpmType_lookup[be_drivers[i]->type], be_drivers[i]->desc());
 106     }
 107     fprintf(stderr, "\n");
 108 }
 109
 110 /*
 111  * Find the TPM with the given Id
 112  */
 113 TPMBackend *qemu_find_tpm(const char *id)
 114 {
 115     TPMBackend *drv;
 116
 117     if (id) {
 118         QLIST_FOREACH(drv, &tpm_backends, list) {
 119             if (!strcmp(drv->id, id)) {
 120                 return drv;
 121             }
 122         }
 123     }
 124
 125     return NULL;
 126 }
 127
 128 static int configure_tpm(QemuOpts *opts)
 129 {
 130     const char *value;
 131     const char *id;
 132     const TPMDriverOps *be;
 133     TPMBackend *drv;
 134     Error *local_err = NULL;
 135
 136     if (!QLIST_EMPTY(&tpm_backends)) {
 137         error_report("Only one TPM is allowed.\n");
 138         return 1;
 139     }
 140
 141     id = qemu_opts_id(opts);
 142     if (id == NULL) {
 143         qerror_report(QERR_MISSING_PARAMETER, "id");
 144         return 1;
 145     }
 146
 147     value = qemu_opt_get(opts, "type");
 148     if (!value) {
 149         qerror_report(QERR_MISSING_PARAMETER, "type");
 150         tpm_display_backend_drivers();
 151         return 1;
 152     }
 153
 154     be = tpm_get_backend_driver(value);
 155     if (be == NULL) {
 156         qerror_report(QERR_INVALID_PARAMETER_VALUE, "type",
 157                       "a TPM backend type");
 158         tpm_display_backend_drivers();
 159         return 1;
 160     }
 161
 162     /* validate backend specific opts */
 163     qemu_opts_validate(opts, be->opts, &local_err);
 164     if (error_is_set(&local_err)) {
 165         qerror_report_err(local_err);
 166         error_free(local_err);
 167         return 1;
 168     }
 169
 170     drv = be->create(opts, id);
 171     if (!drv) {
 172         return 1;
 173     }
 174
 175     tpm_backend_open(drv, &local_err);
 176     if (local_err) {
 177         qerror_report_err(local_err);
 178         error_free(local_err);
 179         return 1;
 180     }
 181
 182     QLIST_INSERT_HEAD(&tpm_backends, drv, list);
 183
 184     return 0;
 185 }
 186
 187 static int tpm_init_tpmdev(QemuOpts *opts, void *dummy)
 188 {
 189     return configure_tpm(opts);
 190 }
 191
 192 /*
 193  * Walk the list of TPM backend drivers that are in use and call their
 194  * destroy function to have them cleaned up.
 195  */
 196 void tpm_cleanup(void)
 197 {
 198     TPMBackend *drv, *next;
 199
 200     QLIST_FOREACH_SAFE(drv, &tpm_backends, list, next) {
 201         QLIST_REMOVE(drv, list);
 202         tpm_backend_destroy(drv);
 203     }
 204 }
 205
 206 /*
 207  * Initialize the TPM. Process the tpmdev command line options describing the
 208  * TPM backend.
 209  */
 210 int tpm_init(void)
 211 {
 212     if (qemu_opts_foreach(qemu_find_opts("tpmdev"),
 213                           tpm_init_tpmdev, NULL, 1) != 0) {
 214         return -1;
 215     }
 216
 217     atexit(tpm_cleanup);
 218
 219     return 0;
 220 }
 221
 222 /*
 223  * Parse the TPM configuration options.
 224  * To display all available TPM backends the user may use '-tpmdev help'
 225  */
 226 int tpm_config_parse(QemuOptsList *opts_list, const char *optarg)
 227 {
 228     QemuOpts *opts;
 229
 230     if (!strcmp(optarg, "help")) {
 231         tpm_display_backend_drivers();
 232         return -1;
 233     }
 234     opts = qemu_opts_parse(opts_list, optarg, 1);
 235     if (!opts) {
 236         return -1;
 237     }
 238     return 0;
 239 }
 240
 241 #endif /* CONFIG_TPM */
 242
 243 static const TPMDriverOps *tpm_driver_find_by_type(enum TpmType type)
 244 {
 245     int i;
 246
 247     for (i = 0; i < TPM_MAX_DRIVERS && be_drivers[i] != NULL; i++) {
 248         if (be_drivers[i]->type == type) {
 249             return be_drivers[i];
 250         }
 251     }
 252     return NULL;
 253 }
 254
 255 static TPMInfo *qmp_query_tpm_inst(TPMBackend *drv)
 256 {
 257     TPMInfo *res = g_new0(TPMInfo, 1);
 258     TPMPassthroughOptions *tpo;
 259
 260     res->id = g_strdup(drv->id);
 261     res->model = drv->fe_model;
 262     res->options = g_new0(TpmTypeOptions, 1);
 263
 264     switch (drv->ops->type) {
 265     case TPM_TYPE_PASSTHROUGH:
 266         res->options->kind = TPM_TYPE_OPTIONS_KIND_PASSTHROUGH;
 267         tpo = g_new0(TPMPassthroughOptions, 1);
 268         res->options->passthrough = tpo;
 269         if (drv->path) {
 270             tpo->path = g_strdup(drv->path);
 271             tpo->has_path = true;
 272         }
 273         if (drv->cancel_path) {
 274             tpo->cancel_path = g_strdup(drv->cancel_path);
 275             tpo->has_cancel_path = true;
 276         }
 277         break;
 278     case TPM_TYPE_MAX:
 279         break;
 280     }
 281
 282     return res;
 283 }
 284
 285 /*
 286  * Walk the list of active TPM backends and collect information about them
 287  * following the schema description in qapi-schema.json.
 288  */
 289 TPMInfoList *qmp_query_tpm(Error **errp)
 290 {
 291     TPMBackend *drv;
 292     TPMInfoList *info, *head = NULL, *cur_item = NULL;
 293
 294     QLIST_FOREACH(drv, &tpm_backends, list) {
 295         if (!tpm_model_is_registered(drv->fe_model)) {
 296             continue;
 297         }
 298         info = g_new0(TPMInfoList, 1);
 299         info->value = qmp_query_tpm_inst(drv);
 300
 301         if (!cur_item) {
 302             head = cur_item = info;
 303         } else {
 304             cur_item->next = info;
 305             cur_item = info;
 306         }
 307     }
 308
 309     return head;
 310 }
 311
 312 TpmTypeList *qmp_query_tpm_types(Error **errp)
 313 {
 314     unsigned int i = 0;
 315     TpmTypeList *head = NULL, *prev = NULL, *cur_item;
 316
 317     for (i = 0; i < TPM_TYPE_MAX; i++) {
 318         if (!tpm_driver_find_by_type(i)) {
 319             continue;
 320         }
 321         cur_item = g_new0(TpmTypeList, 1);
 322         cur_item->value = i;
 323
 324         if (prev) {
 325             prev->next = cur_item;
 326         }
 327         if (!head) {
 328             head = cur_item;
 329         }
 330         prev = cur_item;
 331     }
 332
 333     return head;
 334 }
 335
 336 TpmModelList *qmp_query_tpm_models(Error **errp)
 337 {
 338     unsigned int i = 0;
 339     TpmModelList *head = NULL, *prev = NULL, *cur_item;
 340
 341     for (i = 0; i < TPM_MODEL_MAX; i++) {
 342         if (!tpm_model_is_registered(i)) {
 343             continue;
 344         }
 345         cur_item = g_new0(TpmModelList, 1);
 346         cur_item->value = i;
 347
 348         if (prev) {
 349             prev->next = cur_item;
 350         }
 351         if (!head) {
 352             head = cur_item;
 353         }
 354         prev = cur_item;
 355     }
 356
 357     return head;
 358 }