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