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 "qemu/osdep.h"
  15
  16 #include "qapi/qmp/qerror.h"
  17 #include "sysemu/tpm_backend.h"
  18 #include "sysemu/tpm.h"
  19 #include "qemu/config-file.h"
  20 #include "qemu/error-report.h"
  21 #include "qmp-commands.h"
  22
  23 static QLIST_HEAD(, TPMBackend) tpm_backends =
  24     QLIST_HEAD_INITIALIZER(tpm_backends);
  25
  26 static bool tpm_models[TPM_MODEL__MAX];
  27
  28 void tpm_register_model(enum TpmModel model)
  29 {
  30     tpm_models[model] = true;
  31 }
  32
  33 #ifdef CONFIG_TPM
  34
  35 static const TPMBackendClass *
  36 tpm_be_find_by_type(enum TpmType type)
  37 {
  38     ObjectClass *oc;
  39     char *typename = g_strdup_printf("tpm-%s", TpmType_str(type));
  40
  41     oc = object_class_by_name(typename);
  42     g_free(typename);
  43
  44     if (!object_class_dynamic_cast(oc, TYPE_TPM_BACKEND)) {
  45         return NULL;
  46     }
  47
  48     return TPM_BACKEND_CLASS(oc);
  49 }
  50
  51 /*
  52  * Walk the list of available TPM backend drivers and display them on the
  53  * screen.
  54  */
  55 static void tpm_display_backend_drivers(void)
  56 {
  57     int i;
  58
  59     fprintf(stderr, "Supported TPM types (choose only one):\n");
  60
  61     for (i = 0; i < TPM_TYPE__MAX; i++) {
  62         const TPMBackendClass *bc = tpm_be_find_by_type(i);
  63         if (!bc) {
  64             continue;
  65         }
  66         fprintf(stderr, "%12s   %s\n", TpmType_str(i), bc->desc);
  67     }
  68     fprintf(stderr, "\n");
  69 }
  70
  71 /*
  72  * Find the TPM with the given Id
  73  */
  74 TPMBackend *qemu_find_tpm(const char *id)
  75 {
  76     TPMBackend *drv;
  77
  78     if (id) {
  79         QLIST_FOREACH(drv, &tpm_backends, list) {
  80             if (!strcmp(drv->id, id)) {
  81                 return drv;
  82             }
  83         }
  84     }
  85
  86     return NULL;
  87 }
  88
  89 static int tpm_init_tpmdev(void *dummy, QemuOpts *opts, Error **errp)
  90 {
  91     const char *value;
  92     const char *id;
  93     const TPMBackendClass *be;
  94     TPMBackend *drv;
  95     Error *local_err = NULL;
  96     int i;
  97
  98     if (!QLIST_EMPTY(&tpm_backends)) {
  99         error_report("Only one TPM is allowed.");
 100         return 1;
 101     }
 102
 103     id = qemu_opts_id(opts);
 104     if (id == NULL) {
 105         error_report(QERR_MISSING_PARAMETER, "id");
 106         return 1;
 107     }
 108
 109     value = qemu_opt_get(opts, "type");
 110     if (!value) {
 111         error_report(QERR_MISSING_PARAMETER, "type");
 112         tpm_display_backend_drivers();
 113         return 1;
 114     }
 115
 116     i = qapi_enum_parse(&TpmType_lookup, value, -1, NULL);
 117     be = i >= 0 ? tpm_be_find_by_type(i) : NULL;
 118     if (be == NULL) {
 119         error_report(QERR_INVALID_PARAMETER_VALUE,
 120                      "type", "a TPM backend type");
 121         tpm_display_backend_drivers();
 122         return 1;
 123     }
 124
 125     /* validate backend specific opts */
 126     qemu_opts_validate(opts, be->opts, &local_err);
 127     if (local_err) {
 128         error_report_err(local_err);
 129         return 1;
 130     }
 131
 132     drv = be->create(opts, id);
 133     if (!drv) {
 134         return 1;
 135     }
 136
 137     tpm_backend_open(drv, &local_err);
 138     if (local_err) {
 139         error_report_err(local_err);
 140         return 1;
 141     }
 142
 143     QLIST_INSERT_HEAD(&tpm_backends, drv, list);
 144
 145     return 0;
 146 }
 147
 148 /*
 149  * Walk the list of TPM backend drivers that are in use and call their
 150  * destroy function to have them cleaned up.
 151  */
 152 void tpm_cleanup(void)
 153 {
 154     TPMBackend *drv, *next;
 155
 156     QLIST_FOREACH_SAFE(drv, &tpm_backends, list, next) {
 157         QLIST_REMOVE(drv, list);
 158         object_unref(OBJECT(drv));
 159     }
 160 }
 161
 162 /*
 163  * Initialize the TPM. Process the tpmdev command line options describing the
 164  * TPM backend.
 165  */
 166 int tpm_init(void)
 167 {
 168     if (qemu_opts_foreach(qemu_find_opts("tpmdev"),
 169                           tpm_init_tpmdev, NULL, NULL)) {
 170         return -1;
 171     }
 172
 173     return 0;
 174 }
 175
 176 /*
 177  * Parse the TPM configuration options.
 178  * To display all available TPM backends the user may use '-tpmdev help'
 179  */
 180 int tpm_config_parse(QemuOptsList *opts_list, const char *optarg)
 181 {
 182     QemuOpts *opts;
 183
 184     if (!strcmp(optarg, "help")) {
 185         tpm_display_backend_drivers();
 186         return -1;
 187     }
 188     opts = qemu_opts_parse_noisily(opts_list, optarg, true);
 189     if (!opts) {
 190         return -1;
 191     }
 192     return 0;
 193 }
 194
 195 #endif /* CONFIG_TPM */
 196
 197 /*
 198  * Walk the list of active TPM backends and collect information about them
 199  * following the schema description in qapi-schema.json.
 200  */
 201 TPMInfoList *qmp_query_tpm(Error **errp)
 202 {
 203     TPMBackend *drv;
 204     TPMInfoList *info, *head = NULL, *cur_item = NULL;
 205
 206     QLIST_FOREACH(drv, &tpm_backends, list) {
 207         if (!tpm_models[drv->fe_model]) {
 208             continue;
 209         }
 210         info = g_new0(TPMInfoList, 1);
 211         info->value = tpm_backend_query_tpm(drv);
 212
 213         if (!cur_item) {
 214             head = cur_item = info;
 215         } else {
 216             cur_item->next = info;
 217             cur_item = info;
 218         }
 219     }
 220
 221     return head;
 222 }
 223
 224 TpmTypeList *qmp_query_tpm_types(Error **errp)
 225 {
 226     unsigned int i = 0;
 227     TpmTypeList *head = NULL, *prev = NULL, *cur_item;
 228
 229     for (i = 0; i < TPM_TYPE__MAX; i++) {
 230         if (!tpm_be_find_by_type(i)) {
 231             continue;
 232         }
 233         cur_item = g_new0(TpmTypeList, 1);
 234         cur_item->value = i;
 235
 236         if (prev) {
 237             prev->next = cur_item;
 238         }
 239         if (!head) {
 240             head = cur_item;
 241         }
 242         prev = cur_item;
 243     }
 244
 245     return head;
 246 }
 247
 248 TpmModelList *qmp_query_tpm_models(Error **errp)
 249 {
 250     unsigned int i = 0;
 251     TpmModelList *head = NULL, *prev = NULL, *cur_item;
 252
 253     for (i = 0; i < TPM_MODEL__MAX; i++) {
 254         if (!tpm_models[i]) {
 255             continue;
 256         }
 257         cur_item = g_new0(TpmModelList, 1);
 258         cur_item->value = i;
 259
 260         if (prev) {
 261             prev->next = cur_item;
 262         }
 263         if (!head) {
 264             head = cur_item;
 265         }
 266         prev = cur_item;
 267     }
 268
 269     return head;
 270 }