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     drv = be->create(opts, id);
 163     if (!drv) {
 164         return 1;
 165     }
 166
 167     tpm_backend_open(drv, &local_err);
 168     if (local_err) {
 169         qerror_report_err(local_err);
 170         error_free(local_err);
 171         return 1;
 172     }
 173
 174     QLIST_INSERT_HEAD(&tpm_backends, drv, list);
 175
 176     return 0;
 177 }
 178
 179 static int tpm_init_tpmdev(QemuOpts *opts, void *dummy)
 180 {
 181     return configure_tpm(opts);
 182 }
 183
 184 /*
 185  * Walk the list of TPM backend drivers that are in use and call their
 186  * destroy function to have them cleaned up.
 187  */
 188 void tpm_cleanup(void)
 189 {
 190     TPMBackend *drv, *next;
 191
 192     QLIST_FOREACH_SAFE(drv, &tpm_backends, list, next) {
 193         QLIST_REMOVE(drv, list);
 194         tpm_backend_destroy(drv);
 195     }
 196 }
 197
 198 /*
 199  * Initialize the TPM. Process the tpmdev command line options describing the
 200  * TPM backend.
 201  */
 202 int tpm_init(void)
 203 {
 204     if (qemu_opts_foreach(qemu_find_opts("tpmdev"),
 205                           tpm_init_tpmdev, NULL, 1) != 0) {
 206         return -1;
 207     }
 208
 209     atexit(tpm_cleanup);
 210
 211     return 0;
 212 }
 213
 214 /*
 215  * Parse the TPM configuration options.
 216  * To display all available TPM backends the user may use '-tpmdev help'
 217  */
 218 int tpm_config_parse(QemuOptsList *opts_list, const char *optarg)
 219 {
 220     QemuOpts *opts;
 221
 222     if (!strcmp(optarg, "help")) {
 223         tpm_display_backend_drivers();
 224         return -1;
 225     }
 226     opts = qemu_opts_parse(opts_list, optarg, 1);
 227     if (!opts) {
 228         return -1;
 229     }
 230     return 0;
 231 }
 232
 233 #endif /* CONFIG_TPM */
 234
 235 static const TPMDriverOps *tpm_driver_find_by_type(enum TpmType type)
 236 {
 237     int i;
 238
 239     for (i = 0; i < TPM_MAX_DRIVERS && be_drivers[i] != NULL; i++) {
 240         if (be_drivers[i]->type == type) {
 241             return be_drivers[i];
 242         }
 243     }
 244     return NULL;
 245 }
 246
 247 static TPMInfo *qmp_query_tpm_inst(TPMBackend *drv)
 248 {
 249     TPMInfo *res = g_new0(TPMInfo, 1);
 250     TPMPassthroughOptions *tpo;
 251
 252     res->id = g_strdup(drv->id);
 253     res->model = drv->fe_model;
 254     res->options = g_new0(TpmTypeOptions, 1);
 255
 256     switch (drv->ops->type) {
 257     case TPM_TYPE_PASSTHROUGH:
 258         res->options->kind = TPM_TYPE_OPTIONS_KIND_PASSTHROUGH;
 259         tpo = g_new0(TPMPassthroughOptions, 1);
 260         res->options->passthrough = tpo;
 261         if (drv->path) {
 262             tpo->path = g_strdup(drv->path);
 263             tpo->has_path = true;
 264         }
 265         if (drv->cancel_path) {
 266             tpo->cancel_path = g_strdup(drv->cancel_path);
 267             tpo->has_cancel_path = true;
 268         }
 269         break;
 270     case TPM_TYPE_MAX:
 271         break;
 272     }
 273
 274     return res;
 275 }
 276
 277 /*
 278  * Walk the list of active TPM backends and collect information about them
 279  * following the schema description in qapi-schema.json.
 280  */
 281 TPMInfoList *qmp_query_tpm(Error **errp)
 282 {
 283     TPMBackend *drv;
 284     TPMInfoList *info, *head = NULL, *cur_item = NULL;
 285
 286     QLIST_FOREACH(drv, &tpm_backends, list) {
 287         if (!tpm_model_is_registered(drv->fe_model)) {
 288             continue;
 289         }
 290         info = g_new0(TPMInfoList, 1);
 291         info->value = qmp_query_tpm_inst(drv);
 292
 293         if (!cur_item) {
 294             head = cur_item = info;
 295         } else {
 296             cur_item->next = info;
 297             cur_item = info;
 298         }
 299     }
 300
 301     return head;
 302 }
 303
 304 TpmTypeList *qmp_query_tpm_types(Error **errp)
 305 {
 306     unsigned int i = 0;
 307     TpmTypeList *head = NULL, *prev = NULL, *cur_item;
 308
 309     for (i = 0; i < TPM_TYPE_MAX; i++) {
 310         if (!tpm_driver_find_by_type(i)) {
 311             continue;
 312         }
 313         cur_item = g_new0(TpmTypeList, 1);
 314         cur_item->value = i;
 315
 316         if (prev) {
 317             prev->next = cur_item;
 318         }
 319         if (!head) {
 320             head = cur_item;
 321         }
 322         prev = cur_item;
 323     }
 324
 325     return head;
 326 }
 327
 328 TpmModelList *qmp_query_tpm_models(Error **errp)
 329 {
 330     unsigned int i = 0;
 331     TpmModelList *head = NULL, *prev = NULL, *cur_item;
 332
 333     for (i = 0; i < TPM_MODEL_MAX; i++) {
 334         if (!tpm_model_is_registered(i)) {
 335             continue;
 336         }
 337         cur_item = g_new0(TpmModelList, 1);
 338         cur_item->value = i;
 339
 340         if (prev) {
 341             prev->next = cur_item;
 342         }
 343         if (!head) {
 344             head = cur_item;
 345         }
 346         prev = cur_item;
 347     }
 348
 349     return head;
 350 }