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_setg(errp, "Only one TPM is allowed.");
  93         return 1;
  94     }
  95
  96     id = qemu_opts_id(opts);
  97     if (id == NULL) {
  98         error_setg(errp, QERR_MISSING_PARAMETER, "id");
  99         return 1;
 100     }
 101
 102     value = qemu_opt_get(opts, "type");
 103     if (!value) {
 104         error_setg(errp, 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_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
 113                    "a TPM backend type");
 114         tpm_display_backend_drivers();
 115         return 1;
 116     }
 117
 118     /* validate backend specific opts */
 119     if (!qemu_opts_validate(opts, be->opts, &local_err)) {
 120         error_propagate(errp, local_err);
 121         return 1;
 122     }
 123
 124     drv = be->create(opts);
 125     if (!drv) {
 126         return 1;
 127     }
 128
 129     drv->id = g_strdup(id);
 130     QLIST_INSERT_HEAD(&tpm_backends, drv, list);
 131
 132     return 0;
 133 }
 134
 135 /*
 136  * Walk the list of TPM backend drivers that are in use and call their
 137  * destroy function to have them cleaned up.
 138  */
 139 void tpm_cleanup(void)
 140 {
 141     TPMBackend *drv, *next;
 142
 143     QLIST_FOREACH_SAFE(drv, &tpm_backends, list, next) {
 144         QLIST_REMOVE(drv, list);
 145         object_unref(OBJECT(drv));
 146     }
 147 }
 148
 149 /*
 150  * Initialize the TPM. Process the tpmdev command line options describing the
 151  * TPM backend.
 152  */
 153 void tpm_init(void)
 154 {
 155     qemu_opts_foreach(qemu_find_opts("tpmdev"),
 156                       tpm_init_tpmdev, NULL, &error_fatal);
 157 }
 158
 159 /*
 160  * Parse the TPM configuration options.
 161  * To display all available TPM backends the user may use '-tpmdev help'
 162  */
 163 int tpm_config_parse(QemuOptsList *opts_list, const char *optarg)
 164 {
 165     QemuOpts *opts;
 166
 167     if (!strcmp(optarg, "help")) {
 168         tpm_display_backend_drivers();
 169         return -1;
 170     }
 171     opts = qemu_opts_parse_noisily(opts_list, optarg, true);
 172     if (!opts) {
 173         return -1;
 174     }
 175     return 0;
 176 }
 177
 178 /*
 179  * Walk the list of active TPM backends and collect information about them.
 180  */
 181 TPMInfoList *qmp_query_tpm(Error **errp)
 182 {
 183     TPMBackend *drv;
 184     TPMInfoList *info, *head = NULL, *cur_item = NULL;
 185
 186     QLIST_FOREACH(drv, &tpm_backends, list) {
 187         if (!drv->tpmif) {
 188             continue;
 189         }
 190
 191         info = g_new0(TPMInfoList, 1);
 192         info->value = tpm_backend_query_tpm(drv);
 193
 194         if (!cur_item) {
 195             head = cur_item = info;
 196         } else {
 197             cur_item->next = info;
 198             cur_item = info;
 199         }
 200     }
 201
 202     return head;
 203 }
 204
 205 TpmTypeList *qmp_query_tpm_types(Error **errp)
 206 {
 207     unsigned int i = 0;
 208     TpmTypeList *head = NULL, *prev = NULL, *cur_item;
 209
 210     for (i = 0; i < TPM_TYPE__MAX; i++) {
 211         if (!tpm_be_find_by_type(i)) {
 212             continue;
 213         }
 214         cur_item = g_new0(TpmTypeList, 1);
 215         cur_item->value = i;
 216
 217         if (prev) {
 218             prev->next = cur_item;
 219         }
 220         if (!head) {
 221             head = cur_item;
 222         }
 223         prev = cur_item;
 224     }
 225
 226     return head;
 227 }
 228 TpmModelList *qmp_query_tpm_models(Error **errp)
 229 {
 230     TpmModelList *head = NULL, *prev = NULL, *cur_item;
 231     GSList *e, *l = object_class_get_list(TYPE_TPM_IF, false);
 232
 233     for (e = l; e; e = e->next) {
 234         TPMIfClass *c = TPM_IF_CLASS(e->data);
 235
 236         cur_item = g_new0(TpmModelList, 1);
 237         cur_item->value = c->model;
 238
 239         if (prev) {
 240             prev->next = cur_item;
 241         }
 242         if (!head) {
 243             head = cur_item;
 244         }
 245         prev = cur_item;
 246     }
 247     g_slist_free(l);
 248
 249     return head;
 250 }