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