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     /*
  85      * Use of error_report() in a function with an Error ** parameter
  86      * is suspicious.  It is okay here.  The parameter only exists to
  87      * make the function usable with qemu_opts_foreach().  It is not
  88      * actually used.
  89      */
  90     const char *value;
  91     const char *id;
  92     const TPMBackendClass *be;
  93     TPMBackend *drv;
  94     Error *local_err = NULL;
  95     int i;
  96
  97     if (!QLIST_EMPTY(&tpm_backends)) {
  98         error_report("Only one TPM is allowed.");
  99         return 1;
 100     }
 101
 102     id = qemu_opts_id(opts);
 103     if (id == NULL) {
 104         error_report(QERR_MISSING_PARAMETER, "id");
 105         return 1;
 106     }
 107
 108     value = qemu_opt_get(opts, "type");
 109     if (!value) {
 110         error_report(QERR_MISSING_PARAMETER, "type");
 111         tpm_display_backend_drivers();
 112         return 1;
 113     }
 114
 115     i = qapi_enum_parse(&TpmType_lookup, value, -1, NULL);
 116     be = i >= 0 ? tpm_be_find_by_type(i) : NULL;
 117     if (be == NULL) {
 118         error_report(QERR_INVALID_PARAMETER_VALUE,
 119                      "type", "a TPM backend type");
 120         tpm_display_backend_drivers();
 121         return 1;
 122     }
 123
 124     /* validate backend specific opts */
 125     if (!qemu_opts_validate(opts, be->opts, &local_err)) {
 126         error_report_err(local_err);
 127         return 1;
 128     }
 129
 130     drv = be->create(opts);
 131     if (!drv) {
 132         return 1;
 133     }
 134
 135     drv->id = g_strdup(id);
 136     QLIST_INSERT_HEAD(&tpm_backends, drv, list);
 137
 138     return 0;
 139 }
 140
 141 /*
 142  * Walk the list of TPM backend drivers that are in use and call their
 143  * destroy function to have them cleaned up.
 144  */
 145 void tpm_cleanup(void)
 146 {
 147     TPMBackend *drv, *next;
 148
 149     QLIST_FOREACH_SAFE(drv, &tpm_backends, list, next) {
 150         QLIST_REMOVE(drv, list);
 151         object_unref(OBJECT(drv));
 152     }
 153 }
 154
 155 /*
 156  * Initialize the TPM. Process the tpmdev command line options describing the
 157  * TPM backend.
 158  */
 159 int tpm_init(void)
 160 {
 161     if (qemu_opts_foreach(qemu_find_opts("tpmdev"),
 162                           tpm_init_tpmdev, NULL, NULL)) {
 163         return -1;
 164     }
 165
 166     return 0;
 167 }
 168
 169 /*
 170  * Parse the TPM configuration options.
 171  * To display all available TPM backends the user may use '-tpmdev help'
 172  */
 173 int tpm_config_parse(QemuOptsList *opts_list, const char *optarg)
 174 {
 175     QemuOpts *opts;
 176
 177     if (!strcmp(optarg, "help")) {
 178         tpm_display_backend_drivers();
 179         return -1;
 180     }
 181     opts = qemu_opts_parse_noisily(opts_list, optarg, true);
 182     if (!opts) {
 183         return -1;
 184     }
 185     return 0;
 186 }
 187
 188 /*
 189  * Walk the list of active TPM backends and collect information about them.
 190  */
 191 TPMInfoList *qmp_query_tpm(Error **errp)
 192 {
 193     TPMBackend *drv;
 194     TPMInfoList *info, *head = NULL, *cur_item = NULL;
 195
 196     QLIST_FOREACH(drv, &tpm_backends, list) {
 197         if (!drv->tpmif) {
 198             continue;
 199         }
 200
 201         info = g_new0(TPMInfoList, 1);
 202         info->value = tpm_backend_query_tpm(drv);
 203
 204         if (!cur_item) {
 205             head = cur_item = info;
 206         } else {
 207             cur_item->next = info;
 208             cur_item = info;
 209         }
 210     }
 211
 212     return head;
 213 }
 214
 215 TpmTypeList *qmp_query_tpm_types(Error **errp)
 216 {
 217     unsigned int i = 0;
 218     TpmTypeList *head = NULL, *prev = NULL, *cur_item;
 219
 220     for (i = 0; i < TPM_TYPE__MAX; i++) {
 221         if (!tpm_be_find_by_type(i)) {
 222             continue;
 223         }
 224         cur_item = g_new0(TpmTypeList, 1);
 225         cur_item->value = i;
 226
 227         if (prev) {
 228             prev->next = cur_item;
 229         }
 230         if (!head) {
 231             head = cur_item;
 232         }
 233         prev = cur_item;
 234     }
 235
 236     return head;
 237 }
 238 TpmModelList *qmp_query_tpm_models(Error **errp)
 239 {
 240     TpmModelList *head = NULL, *prev = NULL, *cur_item;
 241     GSList *e, *l = object_class_get_list(TYPE_TPM_IF, false);
 242
 243     for (e = l; e; e = e->next) {
 244         TPMIfClass *c = TPM_IF_CLASS(e->data);
 245
 246         cur_item = g_new0(TpmModelList, 1);
 247         cur_item->value = c->model;
 248
 249         if (prev) {
 250             prev->next = cur_item;
 251         }
 252         if (!head) {
 253             head = cur_item;
 254         }
 255         prev = cur_item;
 256     }
 257     g_slist_free(l);
 258
 259     return head;
 260 }