aboutsummaryrefslogtreecommitdiff
path: root/tpm.c
blob: fe03b24858434b33c474c5905f5eea6cee2038b4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
/*
 * TPM configuration
 *
 * Copyright (C) 2011-2013 IBM Corporation
 *
 * Authors:
 *  Stefan Berger    <stefanb@us.ibm.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 *
 * Based on net.c
 */

#include "qemu/osdep.h"

#include "qapi/error.h"
#include "qapi/qapi-commands-tpm.h"
#include "qapi/qmp/qerror.h"
#include "sysemu/tpm_backend.h"
#include "sysemu/tpm.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"

static QLIST_HEAD(, TPMBackend) tpm_backends =
    QLIST_HEAD_INITIALIZER(tpm_backends);

static const TPMBackendClass *
tpm_be_find_by_type(enum TpmType type)
{
    ObjectClass *oc;
    char *typename = g_strdup_printf("tpm-%s", TpmType_str(type));

    oc = object_class_by_name(typename);
    g_free(typename);

    if (!object_class_dynamic_cast(oc, TYPE_TPM_BACKEND)) {
        return NULL;
    }

    return TPM_BACKEND_CLASS(oc);
}

/*
 * Walk the list of available TPM backend drivers and display them on the
 * screen.
 */
static void tpm_display_backend_drivers(void)
{
    int i;

    fprintf(stderr, "Supported TPM types (choose only one):\n");

    for (i = 0; i < TPM_TYPE__MAX; i++) {
        const TPMBackendClass *bc = tpm_be_find_by_type(i);
        if (!bc) {
            continue;
        }
        fprintf(stderr, "%12s   %s\n", TpmType_str(i), bc->desc);
    }
    fprintf(stderr, "\n");
}

/*
 * Find the TPM with the given Id
 */
TPMBackend *qemu_find_tpm_be(const char *id)
{
    TPMBackend *drv;

    if (id) {
        QLIST_FOREACH(drv, &tpm_backends, list) {
            if (!strcmp(drv->id, id)) {
                return drv;
            }
        }
    }

    return NULL;
}

static int tpm_init_tpmdev(void *dummy, QemuOpts *opts, Error **errp)
{
    const char *value;
    const char *id;
    const TPMBackendClass *be;
    TPMBackend *drv;
    int i;

    if (!QLIST_EMPTY(&tpm_backends)) {
        error_setg(errp, "Only one TPM is allowed.");
        return 1;
    }

    id = qemu_opts_id(opts);
    if (id == NULL) {
        error_setg(errp, QERR_MISSING_PARAMETER, "id");
        return 1;
    }

    value = qemu_opt_get(opts, "type");
    if (!value) {
        error_setg(errp, QERR_MISSING_PARAMETER, "type");
        tpm_display_backend_drivers();
        return 1;
    }

    i = qapi_enum_parse(&TpmType_lookup, value, -1, NULL);
    be = i >= 0 ? tpm_be_find_by_type(i) : NULL;
    if (be == NULL) {
        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
                   "a TPM backend type");
        tpm_display_backend_drivers();
        return 1;
    }

    /* validate backend specific opts */
    if (!qemu_opts_validate(opts, be->opts, errp)) {
        return 1;
    }

    drv = be->create(opts);
    if (!drv) {
        return 1;
    }

    drv->id = g_strdup(id);
    QLIST_INSERT_HEAD(&tpm_backends, drv, list);

    return 0;
}

/*
 * Walk the list of TPM backend drivers that are in use and call their
 * destroy function to have them cleaned up.
 */
void tpm_cleanup(void)
{
    TPMBackend *drv, *next;

    QLIST_FOREACH_SAFE(drv, &tpm_backends, list, next) {
        QLIST_REMOVE(drv, list);
        object_unref(OBJECT(drv));
    }
}

/*
 * Initialize the TPM. Process the tpmdev command line options describing the
 * TPM backend.
 */
void tpm_init(void)
{
    qemu_opts_foreach(qemu_find_opts("tpmdev"),
                      tpm_init_tpmdev, NULL, &error_fatal);
}

/*
 * Parse the TPM configuration options.
 * To display all available TPM backends the user may use '-tpmdev help'
 */
int tpm_config_parse(QemuOptsList *opts_list, const char *optarg)
{
    QemuOpts *opts;

    if (!strcmp(optarg, "help")) {
        tpm_display_backend_drivers();
        return -1;
    }
    opts = qemu_opts_parse_noisily(opts_list, optarg, true);
    if (!opts) {
        return -1;
    }
    return 0;
}

/*
 * Walk the list of active TPM backends and collect information about them.
 */
TPMInfoList *qmp_query_tpm(Error **errp)
{
    TPMBackend *drv;
    TPMInfoList *info, *head = NULL, *cur_item = NULL;

    QLIST_FOREACH(drv, &tpm_backends, list) {
        if (!drv->tpmif) {
            continue;
        }

        info = g_new0(TPMInfoList, 1);
        info->value = tpm_backend_query_tpm(drv);

        if (!cur_item) {
            head = cur_item = info;
        } else {
            cur_item->next = info;
            cur_item = info;
        }
    }

    return head;
}

TpmTypeList *qmp_query_tpm_types(Error **errp)
{
    unsigned int i = 0;
    TpmTypeList *head = NULL, *prev = NULL, *cur_item;

    for (i = 0; i < TPM_TYPE__MAX; i++) {
        if (!tpm_be_find_by_type(i)) {
            continue;
        }
        cur_item = g_new0(TpmTypeList, 1);
        cur_item->value = i;

        if (prev) {
            prev->next = cur_item;
        }
        if (!head) {
            head = cur_item;
        }
        prev = cur_item;
    }

    return head;
}
TpmModelList *qmp_query_tpm_models(Error **errp)
{
    TpmModelList *head = NULL, *prev = NULL, *cur_item;
    GSList *e, *l = object_class_get_list(TYPE_TPM_IF, false);

    for (e = l; e; e = e->next) {
        TPMIfClass *c = TPM_IF_CLASS(e->data);

        cur_item = g_new0(TpmModelList, 1);
        cur_item->value = c->model;

        if (prev) {
            prev->next = cur_item;
        }
        if (!head) {
            head = cur_item;
        }
        prev = cur_item;
    }
    g_slist_free(l);

    return head;
}